/* ======================= */
/* dbCodeBook 首页样式 */
/* 复用数据页面的CSS变量系统 */
/* 数据库代表色变量请引用 database_color.css */
/* ======================= */

/* 参考NHANES页面：设置body最小宽度，确保布局稳定 */
body[data-page="dbcodebook-home"] {
    min-width: 1200px;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 功能导航区块：左侧大标题 + 右侧定位/大图/进度条/单卡片 */

.features-nav-layout {
    display: flex;
    flex-direction: column;
    align-items: stretch;
}

.features-nav-tagline-top {
    margin-bottom: 12px;
    flex-shrink: 0;
}

.features-nav-body {
    position: relative;
    min-height: 520px;
    width: 100%;
}

.features-nav-sidebar {
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 240px;
    z-index: 1;
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding: 8px 40px 8px 0;
    justify-content: center;
    border-right: none;
    background: var(--main-bg);
}
.features-nav-sidebar::after {
    content: '';
    position: absolute;
    right: 40px;
    top: 0;
    bottom: 0;
    width: 1px;
    background: linear-gradient(to bottom, transparent 0%, var(--border-color) 25%, var(--border-color) 75%, transparent 100%);
    pointer-events: none;
}

.features-nav-item {
    display: block;
    width: 100%;
    padding: 14px 16px;
    text-align: left;
    font-size: 1rem;
    font-weight: 400;
    color: var(--text-color);
    background: transparent;
    border: none;
    text-align: center;
    border-radius: 8px;
    cursor: pointer;
    transition: color 0.3s ease;
    position: relative;
}

/* 与顶部菜单栏一致：悬停/选中为半透明圆角背景，仅包裹文字区域 */
.features-nav-item:hover {
    color: var(--text-color);
    background: transparent;
}
.features-nav-item:hover::before {
    content: '';
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    width: 50%;
    height: 36px;
    background: rgba(0, 0, 0, 0.08);
    border-radius: 8px;
    z-index: -1;
    pointer-events: none;
}

.features-nav-item.active {
    color: var(--text-color);
    background: transparent;
}
.features-nav-item.active::before {
    content: '';
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    width: 50%;
    height: 36px;
    background: rgba(0, 0, 0, 0.08);
    border-radius: 8px;
    z-index: -1;
    pointer-events: none;
}
.features-nav-item.active::after {
    content: '\f5bc';
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
    color: #FFD016;
    font-size: 1.2em;
    position: absolute;
    left: 12%;
    top: 50%;
    transform: translateY(-50%);
}

@keyframes features-nav-star-bounce-loop {
    0% {
        transform: translateY(-50%) scale(1) rotate(0deg);
    }
    15% {
        transform: translateY(calc(-50% + 3px)) scale(0.95) rotate(-3deg);
    }
    30% {
        transform: translateY(calc(-50% - 15px)) scale(1.25, 0.85) rotate(5deg);
    }
    45% {
        transform: translateY(calc(-50% - 5px)) scale(1.1) rotate(-2deg);
    }
    55% {
        transform: translateY(calc(-50% + 4px)) scale(0.88, 1.18) rotate(2deg);
    }
    70% {
        transform: translateY(calc(-50% - 5px)) scale(1.08, 0.94) rotate(-1deg);
    }
    80% {
        transform: translateY(calc(-50% - 1px)) scale(1.02) rotate(0.5deg);
    }
    90% {
        transform: translateY(calc(-50% - 2px)) scale(1.01) rotate(-0.2deg);
    }
    100% {
        transform: translateY(-50%) scale(1) rotate(0deg);
    }
}

.features-nav-sidebar.sidebar-autoplay .features-nav-item.active::after {
    animation: features-nav-star-bounce-loop 1.6s cubic-bezier(0.34, 1.3, 0.64, 1) infinite;
}
/* 暂停自动播放时，星星温柔害羞版 */
@keyframes features-nav-star-shy-gentle {
    0% { 
        transform: translateY(-50%) translateX(0) scale(1); 
    }
    35% { 
        transform: translateY(calc(-50% - 1px)) translateX(5px) scale(1.15, 0.9) rotate(-3deg); 
    }
    50% { 
        transform: translateY(calc(-50% + 2.5px)) translateX(14px) scale(1.3, 0.8) rotate(-7deg); /* 最远 */
    }
    60% { 
        transform: translateY(calc(-50% + 1px)) translateX(7px) scale(1.15, 0.9) rotate(-4deg); /* 自然回 */
    }
    70% { 
        transform: translateY(calc(-50% - 0.5px)) translateX(2px) scale(1.03, 0.97) rotate(-1deg); 
    }
    80% { 
        transform: translateY(-50%) translateX(0) scale(1); /* 完全回位 */
    }
    90% { 
        transform: translateY(-50%) translateX(0.2px) scale(1.002); /* 微动 */
    }
    100% { 
        transform: translateY(-50%) translateX(0) scale(1); /* 静止 */
    }
}

/* 暂停态：点击固定或悬停媒体区时，星星在圆角框内左右跳动 */
.features-nav-sidebar.sidebar-pinned .features-nav-item.active::after,
.features-nav-sidebar.sidebar-hover-paused .features-nav-item.active::after {
    animation: features-nav-star-shy-gentle 5.5s ease-in-out infinite;
}
:root:not([data-theme="light"]) .features-nav-item:hover::before,
:root:not([data-theme="light"]) .features-nav-item.active::before {
    background: rgba(255, 255, 255, 0.08);
}

.features-nav-map-wrap {
    position: absolute;
    inset: 0;

    min-width: 0;
    display: flex;
    flex-direction: column;
    overflow: visible;
    padding-left: 240px;
    box-sizing: border-box;
}
.features-nav-map-wrap::after {
    display: none;
}

.features-nav-tagline-top .features-map-tagline,
.features-nav-tagline-top .features-nav-tagline {
    margin: 0;
}

/* world-map-wrapper 高度 = features-nav-map-wrap 高度 - tagline 及其 margin */
.features-nav-map-wrap .world-map-wrapper {
    flex: 1;
    min-height: 0;
    z-index: 2;
}

.features-nav-content {
    position: absolute;
    inset: 0;
    z-index: 0;
    min-width: 0;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 50px 0;
}
.features-nav-content > .features-media-progress {
    margin-top: 40px;
}
.features-nav-content > .features-card {
    margin-top: 20px;
}

.features-nav-tagline {
    margin: 0;
    padding-bottom: 8px;
    position: relative;
    font-size: 13px;
    font-weight: 400;
    line-height: 1.6;
    text-align: center;
    color: #969696;
    opacity: 0.9;
}
.features-nav-tagline::before {
    content: '';
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    height: 1px;
    background: linear-gradient(to right, transparent 0%, var(--border-color) 25%, var(--border-color) 75%, transparent 100%);
    pointer-events: none;
}

.features-media-inner {
    flex: none;
    height: auto;
    max-height: 360px;
    border-radius: 12px;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.features-media-track {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0;
    width: 100%;
    height: auto;
    max-height: 360px;
    min-height: 0;
    padding: 0 8px;
    box-sizing: border-box;
    transition: transform 0.3s ease;
}
.features-media-track--fade-out .features-media-slot-img,
.features-media-track--fade-out .features-media-slot-video {
    opacity: 0;
}
.features-media-track--slide-prev {
    transform: translateX(2.5%);
}
.features-media-track--slide-next {
    transform: translateX(-2.5%);
}

.features-media-slot {
    position: relative;
    flex: 0 0 22%;
    aspect-ratio: 4/3;
    height: auto;
    max-height: 360px;
    border-radius: 10px;
    overflow: hidden;
    background: #bcbcbc70;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1;
    transition: flex 0.25s ease, opacity 0.2s, transform 0.2s;
    margin: 0 -8px;
}
.features-media-slot:hover {
    z-index: 3;
}
/* 仅对图片/视频压暗并轻微模糊，标题区域保持清晰 */
.features-media-slot:not(.features-media-slot--center) .features-media-slot-img,
.features-media-slot:not(.features-media-slot--center) .features-media-slot-video {
    opacity: 0.75;
    filter: blur(1px);
}
.features-media-slot[data-slot="-2"],
.features-media-slot[data-slot="2"] {
    flex: 0 0 18%;
    z-index: 0;
}
.features-media-slot[data-slot="-2"] .features-media-slot-img,
.features-media-slot[data-slot="-2"] .features-media-slot-video,
.features-media-slot[data-slot="2"] .features-media-slot-img,
.features-media-slot[data-slot="2"] .features-media-slot-video {
    opacity: 0.30;
    filter: blur(1px);
}
.features-media-slot:hover .features-media-slot-img,
.features-media-slot:hover .features-media-slot-video {
    opacity: 1;
    filter: none;
}
.features-media-slot[data-slot="-1"],
.features-media-slot[data-slot="1"] {
    z-index: 1;
}
.features-media-slot--center {
    flex: 0 0 42%;
    z-index: 2;
    margin: 0 -10px;
}
/* 内容不足 5 个时槽位仍占位，仅透明且不参与交互 */
.features-media-slot.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

.features-media-slot-img {
    width: auto;
    height: 100%;
    max-width: 100%;
    object-fit: contain;
    display: block;
    cursor: zoom-in;
    transition: opacity 0.25s ease, filter 0.25s ease;
}
.features-media-slot:not(.features-media-slot--center) .features-media-slot-img {
    cursor: pointer;
}
.features-media-slot--center .features-media-slot-img {
    cursor: zoom-in;
}

.features-media-slot-video {
    width: auto;
    height: 100%;
    max-width: 100%;
    object-fit: contain;
    display: block;
    transition: opacity 0.25s ease, filter 0.25s ease;
    position: relative;
    z-index: 0;
}
.features-media-slot:not(.features-media-slot--center) .features-media-slot-video {
    cursor: pointer;
}
.features-media-slot--center .features-media-slot-video {
    cursor: zoom-in;
}

.features-media-slot-poster {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-size: contain;
    background-position: center;
    background-repeat: no-repeat;
    pointer-events: none;
    z-index: 0;
    display: none;
}

.features-media-slot-title {
    position: absolute;
    inset: 0;
    padding: 8px;
    /* 底层：整块略浅；上层：左上三角 + 右下三角更深 */
    background:
        linear-gradient(135deg, rgba(0,0,0,0.6) 50%, transparent 50%),
        rgba(0,0,0,0.48);
    background-size: 100% 100%;
    background-repeat: no-repeat;
    color: #fff;
    font-size: 14px;
    text-align: center;
    opacity: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    clip-path: inset(0 0 0 0);
    transition: opacity 0.2s, clip-path 0.35s ease;
    z-index: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
/* 非中心槽位显示标题，背景铺满槽位盖住后方内容 */
.features-media-slot:not(.features-media-slot--center) .features-media-slot-title {
    opacity: 1;
}
/* 悬停时标题从中间向两边散开直至完全收起 */
.features-media-slot:not(.features-media-slot--center):hover .features-media-slot-title {
    clip-path: inset(50% 0 50% 0);
    /* 背景也相应变化 */
    background: linear-gradient(135deg, rgba(0,0,0,0.8) 50%, transparent 50%);
}
/* 中心槽位隐藏标题 */
.features-media-slot--center .features-media-slot-title {
    display: none;
}

.features-media-replace,
.features-media-poster {
    position: absolute;
    bottom: 10px;
    right: 10px;
    padding: 6px 12px;
    font-size: 13px;
    color: var(--text-color);
    background: color-mix(in srgb, var(--main-bg) 90%, rgba(0,0,0,0.5));
    border: 1px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    transition: background 0.2s, border-color 0.2s;
    z-index: 10;
}
.features-media-poster {
    right: auto;
    left: 10px;
}
.features-media-replace:hover,
.features-media-poster:hover {
    background: color-mix(in srgb, #FFD016 25%, transparent);
    border-color: #FFD016;
}
.features-media-replace:disabled,
.features-media-poster:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* 弹窗放大：遮罩 + 大图，须高于侧栏 sidebar-pinned */
.features-media-lightbox {
    position: fixed;
    inset: 0;
    z-index: 10001;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    box-sizing: border-box;
}
.features-media-lightbox-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.85);
    cursor: default;
}
.features-media-lightbox-hint {
    position: absolute;
    top: 20px;
    left: 20px;
    z-index: 2;
    margin: 0;
    padding: 8px 14px;
    font-size: 14px;
    color: rgba(255, 255, 255, 0.85);
    background: rgba(255, 255, 255, 0.2);
    border-radius: 10px;
    pointer-events: none;
}
.features-media-lightbox-zoom {
    position: absolute;
    bottom: 24px;
    right: 24px;
    z-index: 2;
    display: flex;
    flex-direction: column;
    gap: 10px;
}
.features-media-lightbox-btn {
    width: 36px;
    height: 36px;
    padding: 0;
    border: none;
    border-radius: 10px;
    background: rgba(255, 255, 255, 0.2);
    color: #fff;
    font-size: 22px;
    line-height: 1;
    cursor: pointer;
    transition: background 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
}
.features-media-lightbox-btn:hover {
    background: rgba(255, 255, 255, 0.35);
}
.features-media-lightbox-img,
.features-media-lightbox-video {
    position: relative;
    z-index: 1;
    max-width: 90vw;
    max-height: 90vh;
    width: auto;
    height: auto;
    object-fit: contain;
    cursor: default;
    transform-origin: center center;
}

.features-media-progress {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    flex-wrap: wrap;
}

.features-progress-dot {
    width: 10px;
    height: 10px;
    padding: 0;
    border: none;
    border-radius: 50%;
    background: color-mix(in srgb, var(--border-color) 80%, transparent);
    cursor: pointer;
    transition: transform 0.2s, background 0.2s;
}

.features-progress-dot:hover {
    transform: scale(1.2);
    background: color-mix(in srgb, var(--text-color) 60%, transparent);
}

.features-progress-dot.current {
    background: #FFD016;
    transform: scale(1.2);
}

.features-progress-bar {
    width: 14px;
    height: 4px;
    padding: 0;
    border: none;
    border-radius: 2px;
    background: color-mix(in srgb, var(--border-color) 80%, transparent);
    cursor: pointer;
    transition: transform 0.2s, background 0.2s;
}
.features-progress-bar:hover {
    background: color-mix(in srgb, var(--text-color) 60%, transparent);
}
.features-progress-bar.current {
    background: #FFD016;
}
/* 视频进度条 - 22px，选中时背景为灰色 */
.features-progress-bar-video.current {
    background: color-mix(in srgb, var(--border-color) 80%, transparent);
}
/* 视频进度条 - 22px */
.features-progress-bar-video {
    width: 22px;
}
/* 视频播放进度条填充 */
.features-progress-bar-fill {
    display: block;
    height: 100%;
    width: 0%;
    background: #FFD016;
    border-radius: 2px;
    transition: width 0.1s linear;
}

.features-card {
    padding: 0px 24px;
    border-radius: 12px;
    text-align: center;
}

.features-card-title {
    margin: 0 0 8px;
    font-size: 20px;
    font-weight: 400;
    color: var(--text-color);
}

.features-card-desc {
    margin: 0;
    font-size: 13px;
    line-height: 1.6;
    color: var(--text-color);
    opacity: 0.88;
}

:root:not([data-theme="light"]) .features-media-inner,
:root:not([data-theme="light"]) .features-card {
    border-color: rgba(70, 70, 70, 0.8);
}
:root:not([data-theme="light"]) .features-media-slot {
    background: rgba(55, 55, 55, 0.6);
}
:root:not([data-theme="light"]) .features-media-slot-title {
    color: #C6C6C6;
}

/* 平台介绍区域 */
.intro-section {
    display: none;
    padding: 0;
    background: var(--main-bg);
    animation: fadeIn 0.8s ease-in;
}

.intro-content-wrapper {
    padding: 100px;
    display: grid;
    grid-template-columns: 2.5fr 1fr;
    gap: 120px;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
}

.intro-content {
    min-width: 0;
}

.intro-paragraph {
    margin-bottom: 30px;
}

.intro-paragraph:last-of-type {
    margin-bottom: 0;
}

.intro-paragraph p {
    font-size: 1.25rem;
    font-weight: 300;
    line-height: 1.9;
    color: var(--text-color);
    text-align: left;
    margin: 0;
}

/* 两栏布局 - 使用grid布局精确控制分栏 */
.intro-two-column {
    margin-left: 40px;
}

.intro-two-column .two-column-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0;
}

.intro-two-column .column-item {
    font-size: 1.25rem;
    font-weight: 300;
    line-height: 1.9;
    color: var(--text-color);
    text-align: left;
    margin: 0;
}

.intro-two-column .column-item:first-child {
    border-right: 1px solid var(--border-color);
    padding-right: 40px;
}

.intro-two-column .column-item:last-child {
    padding-left: 40px;
}

/* 黑夜模式下的分割线样式 */
:root:not([data-theme="light"]) .intro-two-column .column-item:first-child {
    border-right-color: rgba(70, 70, 70, 0.8);
}

/* 统计数据展示 */
.hero-stats {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.stat-box {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0px;
    padding: 20px 25px;
    background: var(--light-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    transition: all 0.3s ease;
}

/* 黑夜模式下的统计卡片样式（参考笔记卡片） */
:root:not([data-theme="light"]) .stat-box {
    background: rgba(45, 45, 45, 0.95);
    border: 1px solid rgba(70, 70, 70, 0.8);
    border-radius: 12px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.3);
    backdrop-filter: blur(8px);
    color: #E5E5E5;
}

:root:not([data-theme="light"]) .stat-box:hover {
    background: rgba(50, 50, 50, 0.98);
    box-shadow: 0 6px 24px rgba(255, 208, 22, 0.15);
}

.stat-box:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
    border-color: #FFD016;
}

/* 白天模式下stat-box根据图标设置对应的悬停效果（70%原色+30%白色） */
/* fa-users 图标对应的stat-box - 使用美国、中国、英国的混合色 */
:root[data-theme="light"] .stat-box:has(.fa-users):hover {
    border-color: color-mix(in srgb, var(--color-usa) 70%, white 30%);
    box-shadow: 0 8px 24px rgba(174, 77, 77, 0.2);
}

/* fa-database 图标对应的stat-box - 使用欧洲、墨西哥、哥斯达黎加的混合色 */
:root[data-theme="light"] .stat-box:has(.fa-database):hover {
    border-color: color-mix(in srgb, var(--color-europe) 70%, white 30%);
    box-shadow: 0 8px 24px rgba(185, 139, 204, 0.2);
}

/* fa-book 图标对应的stat-box - 使用印度、美国、中国的混合色 */
:root[data-theme="light"] .stat-box:has(.fa-book):hover {
    border-color: color-mix(in srgb, var(--color-india) 70%, white 30%);
    box-shadow: 0 8px 24px rgba(238, 208, 100, 0.2);
}

.stat-icon {
    font-size: 2.5rem;
    color: #FFD016;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 80px;
    flex-shrink: 0;
}

/* 白天模式下统计图标使用彩色渐变 */
/* fa-users 图标 - 三个小人使用三种颜色（美国、中国、英国） */
:root[data-theme="light"] .stat-icon .fa-users {
    background: linear-gradient(90deg, 
        color-mix(in srgb, var(--color-usa) 70%, white 30%) 0%,
        color-mix(in srgb, var(--color-usa) 70%, white 30%) 50%,
        color-mix(in srgb, var(--color-india) 70%, white 30%) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    color: transparent;
}

/* fa-database 图标 - 使用三种颜色（欧洲、墨西哥、哥斯达黎加） */
:root[data-theme="light"] .stat-icon .fa-database {
    background: linear-gradient(180deg, 
        color-mix(in srgb, var(--color-europe) 70%, white 30%) 0%,
        color-mix(in srgb, var(--color-europe) 70%, white 30%) 50%,
        color-mix(in srgb, var(--color-costa-rica) 70%, white 30%) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    color: transparent;
}

/* fa-book 图标 - 使用三种颜色（印度、美国、中国） */
:root[data-theme="light"] .stat-icon .fa-book {
    background: linear-gradient(45deg, 
        color-mix(in srgb, var(--color-india) 70%, white 30%) 0%,
        color-mix(in srgb, var(--color-uk) 70%, white 30%) 50%,
        color-mix(in srgb, var(--color-uk) 70%, white 30%) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    color: transparent;
}

.stat-info {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    width: 80px;
    flex-shrink: 0;
}

.stat-number {
    font-size: 2rem;
    font-weight: bold;
    color: var(--text-color);
    line-height: 1.2;
}

.stat-label {
    font-size: 0.9rem;
    color: var(--text-color);
    opacity: 0.7;
    margin-top: 4px;
}

/* 通用区域容器 */
.section-container {
    max-width: 1400px;
    margin: 100px auto;
    padding: 0 20px;
}

.section-title {
    font-size: 2.5rem;
    font-weight: bold;
    color: var(--text-color);
    text-align: center;
    margin: 250px 0 50px 0;
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--text-color);
    opacity: 0.8;
    text-align: center;
    margin-bottom: 40px;
    line-height: 1.6;
}

.section-header {
    text-align: center;
    margin-bottom: 50px;
}

/* 数据库探索区：触屏不等待双击缩放，触摸更快响应 */
.database-exploration,
.database-exploration .database-grid,
#harmonized-deck {
    touch-action: manipulation;
}
.database-exploration {
    background: var(--main-bg);
}

/* 单波 + Harmonized 同一排 3:1 */
.database-groups-row {
    display: flex;
    flex-direction: row;
    gap: 30px;
    align-items: stretch;
    margin-top: 0;
}
.database-groups-row #single-wave-group {
    flex: 2;
    min-width: 0; /* 允许列收缩，下方 grid 用横向滚动兜底 */
}
.database-groups-row #harmonized-group {
    flex: 1;
    min-width: 0;
}

/* 3:1 列内：grid 允许收缩到列宽，扑克叠放时内容总宽已小于 N×320，不会撑破 */
.database-groups-row .database-grid {
    min-width: 0;
}

.database-group {
    margin-bottom: 60px;
}

.database-groups-row .database-group {
    margin-bottom: 0;
}

.database-group:last-child {
    margin-bottom: 0;
}

.database-group-title {
    font-size: 1.8rem;
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 30px;
    padding-bottom: 15px;
    border-bottom: 2px solid var(--border-color);
}

/* 单波数据系列：底框线向右渐变透明 */
#single-wave-group .database-group-title {
    border-bottom: none;
    position: relative;
}
#single-wave-group .database-group-title::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: 0;
    width: 100%;
    height: 2px;
    background: linear-gradient(to right, var(--border-color), transparent);
}

/* Harmonized Data 系列：底框线向左渐变透明，标题右对齐，标题与底线始终撑满本区 */
#harmonized-group .database-group-title {
    border-bottom: none;
    position: relative;
    text-align: right;
    width: 100%;
    box-sizing: border-box;
}
#harmonized-group .database-group-title::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: 0;
    width: 100%;
    height: 2px;
    background: linear-gradient(to left, var(--border-color), transparent);
}

/* 双击展开：单波区先变为 1:2 再淡出，harmonized 整区同步延伸 */
#harmonized-group {
    transition: flex 0.5s ease;
}
#single-wave-group {
    overflow: visible; /* 不裁剪 database-grid 扑克叠放溢出 */
}
.database-exploration.harmonized-spread-mode .database-groups-row,
.database-exploration.harmonized-collapsing .database-groups-row,
.database-exploration.single-wave-spread-mode .database-groups-row,
.database-exploration.single-wave-collapsing .database-groups-row {
    gap: 0;
    overflow: visible;
}
/* 两段动画：0~50% 变为 1:2，50~100% 淡出并缩为 0；过程不裁剪卡片 */
.database-exploration.harmonized-spread-mode #single-wave-group {
    animation: single-wave-hide 1s ease forwards;
    overflow: visible;
}
.database-exploration.harmonized-spread-mode #harmonized-group {
    animation: harmonized-expand 1s ease forwards;
    min-width: 0;
}
@keyframes single-wave-hide {
    0% {
        flex: 2 1 0;
        opacity: 1;
        min-width: 0;
        max-width: none;
    }
    50% {
        flex: 1 1 0;
        opacity: 0.25;
        min-width: 0;
        max-width: none;
    }
    100% {
        flex: 0 0 0 !important;
        opacity: 0;
        min-width: 0 !important;
        max-width: 0 !important;
        padding-left: 0 !important;
        padding-right: 0 !important;
        margin-left: 0 !important;
        margin-right: 0 !important;
        overflow: hidden; /* 仅完全收起时裁剪，避免残留 */
    }
}
@keyframes harmonized-expand {
    0% {
        flex: 1 1 0;
    }
    50% {
        flex: 2 1 0;
    }
    100% {
        flex: 1 1 100%;
    }
}

/* 双击收起：反向逻辑，先淡入再 1:2 恢复；过程不裁剪 */
.database-exploration.harmonized-collapsing #single-wave-group {
    animation: single-wave-show 1s ease forwards;
    overflow: visible;
}
.database-exploration.harmonized-collapsing #harmonized-group {
    animation: harmonized-collapse 1s ease forwards;
    min-width: 0;
}
@keyframes single-wave-show {
    0% {
        flex: 0 0 0 !important;
        opacity: 0;
        min-width: 0 !important;
        max-width: 0 !important;
        padding-left: 0 !important;
        padding-right: 0 !important;
        margin-left: 0 !important;
        margin-right: 0 !important;
        overflow: hidden;
    }
    50% {
        flex: 1 1 0;
        opacity: 1;
        min-width: 0;
        max-width: none;
    }
    100% {
        flex: 2 1 0;
        opacity: 1;
        min-width: 0;
        max-width: none;
    }
}
@keyframes harmonized-collapse {
    0% {
        flex: 1 1 100%;
    }
    50% {
        flex: 2 1 0;
    }
    100% {
        flex: 1 1 0;
    }
}

/* 单波卡片展开：双击 → 1:2 → 3:0 → 多行网格 */
.database-exploration.single-wave-spread-mode .database-groups-row {
    gap: 0;
}
.database-exploration.single-wave-spread-mode #single-wave-group {
    animation: single-wave-expand-step 1s ease forwards;
    overflow: visible; /* 1:2、3:0 变化过程不裁剪扑克叠放 */
}
.database-exploration.single-wave-spread-mode #harmonized-group {
    animation: harmonized-shrink-for-single 1s ease forwards;
    min-width: 0;
}
@keyframes single-wave-expand-step {
    0% {
        flex: 2 1 0;
    }
    50% {
        flex: 1 1 0; /* 1:2 */
    }
    100% {
        flex: 1 1 100%; /* 3:0 */
    }
}
@keyframes harmonized-shrink-for-single {
    0% {
        flex: 1 1 0;
    }
    50% {
        flex: 2 1 0; /* 1:2 */
    }
    100% {
        flex: 0 0 0 !important;
        min-width: 0 !important;
        max-width: 0 !important;
        opacity: 0;
        padding: 0 !important;
        margin: 0 !important;
        overflow: hidden;
    }
}
.database-exploration.single-wave-spread-mode.single-wave-grid-ready #single-wave-group .database-grid {
    display: grid !important;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
    flex-wrap: unset;
    justify-content: unset;
}
.database-exploration.single-wave-spread-mode.single-wave-grid-ready #single-wave-group .database-grid .database-card {
    flex: none;
    width: 100%;
    min-width: 0;
    max-width: 320px;
    margin-right: 0 !important;
    transform: none !important;
}

/* 单波展开后双击收起：反向 3:0 → 1:2 → 2:1 */
.database-exploration.single-wave-collapsing .database-groups-row {
    gap: 0;
}
.database-exploration.single-wave-collapsing #single-wave-group {
    animation: single-wave-collapse-step 1s ease forwards;
    overflow: visible; /* 收起过程不裁剪 */
}
.database-exploration.single-wave-collapsing #harmonized-group {
    animation: harmonized-expand-from-single 1s ease forwards;
    min-width: 0;
}
@keyframes single-wave-collapse-step {
    0% {
        flex: 1 1 100%;
    }
    50% {
        flex: 1 1 0; /* 1:2 */
    }
    100% {
        flex: 2 1 0; /* 2:1 */
    }
}
@keyframes harmonized-expand-from-single {
    0% {
        flex: 0 0 0 !important;
        min-width: 0 !important;
        max-width: 0 !important;
        opacity: 0;
        padding: 0 !important;
        margin: 0 !important;
        overflow: hidden;
    }
    50% {
        flex: 2 1 0;
        opacity: 1;
        overflow: visible;
    }
    100% {
        flex: 1 1 0;
        opacity: 1;
        overflow: visible;
    }
}

/* 发牌布局：牌堆不占位、不换位置（绝对定位叠在原处），网格占满整行 */
#harmonized-deck.harmonized-dealt {
    position: relative;
    width: 100% !important;
    max-width: 100% !important;
    margin-left: 0 !important;
    margin-right: 0 !important;
    margin-top: 0 !important;
    margin-bottom: 0 !important;
    padding: 20px 0;
}
#harmonized-deck .harmonized-deck-zone {
    position: absolute;
    right: 30px;
    top: 20px;
    width: 320px;
    min-height: 280px;
    z-index: 20; /* 牌堆高于已发好的牌 */
    pointer-events: none; /* 不阻挡网格点击，发牌由 JS 逐张取牌 */
    overflow: visible;
}
#harmonized-deck .harmonized-deck-zone .harmonized-card {
    pointer-events: auto;
}
/* 牌堆内必须 absolute 叠放，用 ID 提高优先级压过 .database-grid .database-card */
#harmonized-deck .harmonized-deck-zone .harmonized-card {
    position: absolute !important;
    left: 0;
    top: 0;
    width: 320px;
    min-width: 320px;
    max-width: 320px;
    margin: 0;
    transition: transform 0.35s ease-out;
}
/* 牌堆内：第一张在最上，依次 5px 错开、z-index 降序 */
#harmonized-deck .harmonized-deck-zone .harmonized-card:nth-child(1) { transform: translate(0, 0); z-index: 10; }
#harmonized-deck .harmonized-deck-zone .harmonized-card:nth-child(2) { transform: translate(5px, 5px); z-index: 9; }
#harmonized-deck .harmonized-deck-zone .harmonized-card:nth-child(3) { transform: translate(10px, 10px); z-index: 8; }
#harmonized-deck .harmonized-deck-zone .harmonized-card:nth-child(4) { transform: translate(15px, 15px); z-index: 7; }
#harmonized-deck .harmonized-deck-zone .harmonized-card:nth-child(5) { transform: translate(20px, 20px); z-index: 6; }
#harmonized-deck .harmonized-deck-zone .harmonized-card:nth-child(6) { transform: translate(25px, 25px); z-index: 5; }
#harmonized-deck .harmonized-deck-zone .harmonized-card:nth-child(7) { transform: translate(30px, 30px); z-index: 4; }
#harmonized-deck .harmonized-deck-zone .harmonized-card:nth-child(8) { transform: translate(35px, 35px); z-index: 3; }
#harmonized-deck .harmonized-deck-zone .harmonized-card:nth-child(9) { transform: translate(40px, 40px); z-index: 2; }
#harmonized-deck .harmonized-deck-zone .harmonized-card:nth-child(10) { transform: translate(45px, 45px); z-index: 1; }
#harmonized-deck .harmonized-grid-zone {
    position: relative;
    z-index: 1;
    width: 100%;
    min-width: 0;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
    align-content: start;
}
#harmonized-deck .harmonized-grid-zone .grid-cell {
    min-height: 260px;
}
#harmonized-deck .harmonized-grid-zone .harmonized-card {
    max-width: 320px;
    min-width: 0;
    margin: 0;
}
/* 已发牌：取消叠牌 wave-in 与负 margin，避免盖住飞入动画或布局错位 */
#harmonized-deck.harmonized-dealt .harmonized-grid-zone .database-card,
#harmonized-deck.harmonized-dealt > .harmonized-card {
    animation: none !important;
    opacity: 1 !important;
    margin-right: 0 !important;
}
/*
 * 发牌网格内每张牌在 .grid-cell 里都是唯一子元素，会误匹配全局「单行扑克」的
 * :nth-child(1) / :nth-last-child(1) 扇形 rotate；这里强制无旋转，悬停仅上浮+轻微放大。
 */
#harmonized-deck.harmonized-dealt .harmonized-grid-zone .database-card {
    transform: none !important;
    transform-origin: center center;
}
#harmonized-deck.harmonized-dealt .harmonized-grid-zone .database-card:hover,
#harmonized-deck.harmonized-dealt .harmonized-grid-zone .database-card.card-hover-delay {
    transform: translateY(-6px) scale(1.02) !important;
    z-index: 2;
}
/* 收起时先淡出网格区，再变布局 */
#harmonized-deck.harmonized-dealt.harmonized-grid-fade-out .harmonized-grid-zone {
    opacity: 0;
    transition: opacity 0.35s ease-out;
}
#harmonized-deck.harmonized-dealt .harmonized-grid-zone {
    transition: opacity 0.35s ease-out;
}

/* 单行、扑克式叠放（负 margin 重叠），悬停置顶；总宽远小于 N×320，不会溢出 */
.database-grid {
    display: flex;
    flex-direction: row;
    flex-wrap: nowrap;
    align-items: stretch;
    justify-content: space-between;  /* 自动分配间距 */
    gap: 0;
    padding: 20px;
    overflow: visible;
}
.database-grid .database-card {
    flex: 0 0 320px;
    width: 320px;
    min-width: 320px;
    max-width: 320px;
    margin-right: -300px; /* 扑克叠放：每张露出约 100px，总宽 ≈ 320 + (n-1)×100 */
    position: relative;
    z-index: 1;
    transform-origin: center bottom; /* 扇形以底部为轴 */
    transition: z-index 0.2s ease, transform 0.3s ease, box-shadow 0.3s ease;
    animation: none; /* 关掉 fadeInUp，下面用 transform 做垂直错开才不会被覆盖 */
}
.database-grid .database-card:hover,
.database-grid .database-card.card-hover-delay {
    transition: z-index 0.2s ease, transform 0.3s ease, box-shadow 0.3s ease;
    z-index: 10;
}
/* 前3个卡片 - 从左侧开始 */
.database-grid .database-card:nth-child(1) { transform: translateY(0) rotate(-4deg); }
.database-grid .database-card:nth-child(2) { transform: translateY(8px) rotate(-2deg); }
.database-grid .database-card:nth-child(3) { transform: translateY(16px) rotate(0deg); }

/* 后3个卡片 - 从右侧开始 */
.database-grid .database-card:nth-last-child(1) { transform: translateY(24px) rotate(4deg); }
.database-grid .database-card:nth-last-child(2) { transform: translateY(16px) rotate(2deg); }
.database-grid .database-card:nth-last-child(3) { transform: translateY(8px) rotate(0deg); }

/* 中间剩余的卡片（如果有） */
.database-grid .database-card:nth-child(n+4):nth-last-child(n+4) { 
    transform: translateY(16px) rotate(0deg); 
}

.database-grid .database-card:last-child {
    margin-right: 0;
}

/* 悬停效果 - 角度变大 */
.database-grid .database-card:nth-child(1):hover,
.database-grid .database-card:nth-child(1).card-hover-delay { 
    transform: translateY(-6px) rotate(-8deg) scale(1.025); 
}
.database-grid .database-card:nth-child(2):hover,
.database-grid .database-card:nth-child(2).card-hover-delay { 
    transform: translateY(2px) rotate(-5deg) scale(1.025); 
}
.database-grid .database-card:nth-child(3):hover,
.database-grid .database-card:nth-child(3).card-hover-delay { 
    transform: translateY(10px) rotate(-2deg) scale(1.025); 
}

.database-grid .database-card:nth-last-child(1):hover,
.database-grid .database-card:nth-last-child(1).card-hover-delay { 
    transform: translateY(18px) rotate(8deg) scale(1.025); 
}
.database-grid .database-card:nth-last-child(2):hover,
.database-grid .database-card:nth-last-child(2).card-hover-delay { 
    transform: translateY(10px) rotate(5deg) scale(1.025); 
}
.database-grid .database-card:nth-last-child(3):hover,
.database-grid .database-card:nth-last-child(3).card-hover-delay { 
    transform: translateY(2px) rotate(2deg) scale(1.025); 
}

/* 中间卡片的悬停效果（如果有） */
.database-grid .database-card:nth-child(n+4):nth-last-child(n+4):hover,
.database-grid .database-card:nth-child(n+4):nth-last-child(n+4).card-hover-delay { 
    transform: translateY(10px) rotate(3deg) scale(1.025); 
}
/* Harmonized 堆叠：完全叠在同一位置，仅用 transform 错开 5px */
#harmonized-group .database-grid {
    justify-content: flex-start;
    width: 320px;
    position: relative;
}
#harmonized-group .database-grid.harmonized-draw-mode {
    margin-left: auto;
    margin-top: 80px;
    margin-right: 30px;
    margin-bottom: auto;
}
#harmonized-group .database-grid .database-card {
    margin-right: -320px;
}

/* Harmonized 卡片波浪入场：0~0.9s 错峰，ease-out quad（与发牌 JS 一致，较 cubic 更匀） */
@keyframes harmonized-card-wave-in {
    0% { opacity: 0; }
    100% { opacity: 1; }
}
#harmonized-group .database-grid .database-card {
    animation: harmonized-card-wave-in 0.48s cubic-bezier(0.25, 0.46, 0.45, 0.94) both;
}
#harmonized-group .database-grid .database-card:nth-child(1) { animation-delay: 0s; }
#harmonized-group .database-grid .database-card:nth-child(2) { animation-delay: 0.189s; }
#harmonized-group .database-grid .database-card:nth-child(3) { animation-delay: 0.356s; }
#harmonized-group .database-grid .database-card:nth-child(4) { animation-delay: 0.5s; }
#harmonized-group .database-grid .database-card:nth-child(5) { animation-delay: 0.622s; }
#harmonized-group .database-grid .database-card:nth-child(6) { animation-delay: 0.722s; }
#harmonized-group .database-grid .database-card:nth-child(7) { animation-delay: 0.8s; }
#harmonized-group .database-grid .database-card:nth-child(8) { animation-delay: 0.856s; }
#harmonized-group .database-grid .database-card:nth-child(9) { animation-delay: 0.889s; }
#harmonized-group .database-grid .database-card:nth-child(10) { animation-delay: 0.9s; }

/* 无 draw-mode 时用 nth-child 固定顺序 + 每张卡片小角度偏移（波浪感） */
#harmonized-group .database-grid:not(.harmonized-draw-mode) .database-card:nth-child(1) { transform: translate(0, 0) rotate(-2.2deg); z-index: 10; }
#harmonized-group .database-grid:not(.harmonized-draw-mode) .database-card:nth-child(2) { transform: translate(5px, 5px) rotate(-1.4deg); z-index: 9; }
#harmonized-group .database-grid:not(.harmonized-draw-mode) .database-card:nth-child(3) { transform: translate(10px, 10px) rotate(-0.6deg); z-index: 8; }
#harmonized-group .database-grid:not(.harmonized-draw-mode) .database-card:nth-child(4) { transform: translate(15px, 15px) rotate(0.2deg); z-index: 7; }
#harmonized-group .database-grid:not(.harmonized-draw-mode) .database-card:nth-child(5) { transform: translate(20px, 20px) rotate(0.8deg); z-index: 6; }
#harmonized-group .database-grid:not(.harmonized-draw-mode) .database-card:nth-child(6) { transform: translate(25px, 25px) rotate(1.4deg); z-index: 5; }
#harmonized-group .database-grid:not(.harmonized-draw-mode) .database-card:nth-child(7) { transform: translate(30px, 30px) rotate(1.8deg); z-index: 4; }
#harmonized-group .database-grid:not(.harmonized-draw-mode) .database-card:nth-child(8) { transform: translate(35px, 35px) rotate(1.2deg); z-index: 3; }
#harmonized-group .database-grid:not(.harmonized-draw-mode) .database-card:nth-child(9) { transform: translate(40px, 40px) rotate(0.5deg); z-index: 2; }
#harmonized-group .database-grid:not(.harmonized-draw-mode) .database-card:nth-child(10) { transform: translate(45px, 45px) rotate(-0.4deg); z-index: 1; }

/* draw-mode：按堆叠位置 class 控制，z-index 降序 + 每张卡片小角度偏移（波浪感）+ 0~0.9s ease-out quad 错峰 */
#harmonized-group .harmonized-draw-mode .harmonized-stack-pos-0 { transform: translate(0, 0) rotate(-2.2deg); z-index: 10; animation-delay: 0s; }
#harmonized-group .harmonized-draw-mode .harmonized-stack-pos-1 { transform: translate(5px, 5px) rotate(-1.4deg); z-index: 9; animation-delay: 0.171s; }
#harmonized-group .harmonized-draw-mode .harmonized-stack-pos-2 { transform: translate(10px, 10px) rotate(-0.6deg); z-index: 8; animation-delay: 0.324s; }
#harmonized-group .harmonized-draw-mode .harmonized-stack-pos-3 { transform: translate(15px, 15px) rotate(0.2deg); z-index: 7; animation-delay: 0.459s; }
#harmonized-group .harmonized-draw-mode .harmonized-stack-pos-4 { transform: translate(20px, 20px) rotate(0.8deg); z-index: 6; animation-delay: 0.576s; }
#harmonized-group .harmonized-draw-mode .harmonized-stack-pos-5 { transform: translate(25px, 25px) rotate(1.4deg); z-index: 5; animation-delay: 0.675s; }
#harmonized-group .harmonized-draw-mode .harmonized-stack-pos-6 { transform: translate(30px, 30px) rotate(1.8deg); z-index: 4; animation-delay: 0.756s; }
#harmonized-group .harmonized-draw-mode .harmonized-stack-pos-7 { transform: translate(35px, 35px) rotate(1.2deg); z-index: 3; animation-delay: 0.819s; }
#harmonized-group .harmonized-draw-mode .harmonized-stack-pos-8 { transform: translate(40px, 40px) rotate(0.5deg); z-index: 2; animation-delay: 0.864s; }
#harmonized-group .harmonized-draw-mode .harmonized-stack-pos-9 { transform: translate(45px, 45px) rotate(-0.4deg); z-index: 1; animation-delay: 0.891s; }
#harmonized-group .harmonized-draw-mode .harmonized-stack-pos-10 { transform: translate(50px, 50px) rotate(-1deg); z-index: 1; animation-delay: 0.9s; }
#harmonized-group .harmonized-draw-mode .harmonized-stack-pos-0:hover,
#harmonized-group .harmonized-draw-mode .harmonized-stack-pos-0.card-hover-delay { transform: translate(0, 0) rotate(-2.2deg) translateY(-6px) scale(1.025); }
#harmonized-group .harmonized-draw-mode .harmonized-stack-pos-1:hover,
#harmonized-group .harmonized-draw-mode .harmonized-stack-pos-1.card-hover-delay { transform: translate(5px, 5px) rotate(-1.4deg) translateY(-6px) scale(1.025); }
#harmonized-group .harmonized-draw-mode .harmonized-stack-pos-2:hover,
#harmonized-group .harmonized-draw-mode .harmonized-stack-pos-2.card-hover-delay { transform: translate(10px, 10px) rotate(-0.6deg) translateY(-6px) scale(1.025); }
#harmonized-group .harmonized-draw-mode .harmonized-stack-pos-3:hover,
#harmonized-group .harmonized-draw-mode .harmonized-stack-pos-3.card-hover-delay { transform: translate(15px, 15px) rotate(0.2deg) translateY(-6px) scale(1.025); }
#harmonized-group .harmonized-draw-mode .harmonized-stack-pos-4:hover,
#harmonized-group .harmonized-draw-mode .harmonized-stack-pos-4.card-hover-delay { transform: translate(20px, 20px) rotate(0.8deg) translateY(-6px) scale(1.025); }
#harmonized-group .harmonized-draw-mode .harmonized-stack-pos-5:hover,
#harmonized-group .harmonized-draw-mode .harmonized-stack-pos-5.card-hover-delay { transform: translate(25px, 25px) rotate(1.4deg) translateY(-6px) scale(1.025); }
#harmonized-group .harmonized-draw-mode .harmonized-stack-pos-6:hover,
#harmonized-group .harmonized-draw-mode .harmonized-stack-pos-6.card-hover-delay { transform: translate(30px, 30px) rotate(1.8deg) translateY(-6px) scale(1.025); }
#harmonized-group .harmonized-draw-mode .harmonized-stack-pos-7:hover,
#harmonized-group .harmonized-draw-mode .harmonized-stack-pos-7.card-hover-delay { transform: translate(35px, 35px) rotate(1.2deg) translateY(-6px) scale(1.025); }
#harmonized-group .harmonized-draw-mode .harmonized-stack-pos-8:hover,
#harmonized-group .harmonized-draw-mode .harmonized-stack-pos-8.card-hover-delay { transform: translate(40px, 40px) rotate(0.5deg) translateY(-6px) scale(1.025); }
#harmonized-group .harmonized-draw-mode .harmonized-stack-pos-9:hover,
#harmonized-group .harmonized-draw-mode .harmonized-stack-pos-9.card-hover-delay { transform: translate(45px, 45px) rotate(-0.4deg) translateY(-6px) scale(1.025); }

/* 抽走动画：顶牌向左滑出并淡出；选择器需不低于 .harmonized-stack-pos-*，否则 z-index 被覆盖导致第3张及以后的牌看不到动画 */
#harmonized-group .harmonized-draw-mode .harmonized-card.drawing-away {
    animation: harmonized-draw-away 0.42s ease forwards;
    pointer-events: none;
    z-index: 100;
}
@keyframes harmonized-draw-away {
    from {
        opacity: 1;
    }
    to {
        transform: translate(-360px, -8px) scale(0.94);
        opacity: 0;
    }
}

/* 手机端/触屏：无真实 hover，用 touchstart/touchend 加 .card-hover-delay；此处 :active 作按压即时反馈（不覆盖 transform） */
@media (hover: none) and (pointer: coarse) {
    .database-grid .database-card:active,
    #harmonized-group .harmonized-draw-mode .database-card:active {
        opacity: 0.92;
        transition: opacity 0.1s ease;
    }
}

/* 原始卡片：初始无磨砂，悬停时磨砂玻璃 */
.database-card {
    background: #fff;
    backdrop-filter: none;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 30px;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    animation: fadeInUp 0.6s ease-out;
    animation-fill-mode: both;
    overflow: hidden;
    box-sizing: border-box;
    /* 确保卡片固定大小，不发生形变 - 与harmonized-card一致 */
    flex: 0 0 320px;
    width: 320px;
    min-width: 320px;
    max-width: 320px;
    height: auto;
}

.database-card:hover,
.database-card.card-hover-delay {
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(8px);
    transition: all 0.3s ease;
}

/* NHANES 卡片底色：白天/黑夜都加一点暖色调 */
:root[data-theme="light"] .database-card[data-db="NHANES"],
:root[data-theme="light"] .database-card.card-copy[data-db="NHANES"] {
    background: #fff9f5;
}
:root[data-theme="light"] .database-card[data-db="NHANES"]:hover,
:root[data-theme="light"] .database-card.card-copy[data-db="NHANES"]:hover {
    background: rgba(255, 249, 245, 0.9);
}
:root:not([data-theme="light"]) .database-card[data-db="NHANES"],
:root:not([data-theme="light"]) .database-card.card-copy[data-db="NHANES"] {
    background: rgb(42, 38, 36);
}
:root:not([data-theme="light"]) .database-card[data-db="NHANES"]:hover,
:root:not([data-theme="light"]) .database-card.card-copy[data-db="NHANES"]:hover,
:root:not([data-theme="light"]) .database-card[data-db="NHANES"].card-hover-delay {
    background: rgba(42, 38, 36, 0.9);
}

/* 黑夜模式下的数据库卡片：初始无磨砂，悬停时磨砂玻璃 */
:root:not([data-theme="light"]) .database-card {
    background: rgb(35, 35, 35);
    border: 1px solid rgba(50, 50, 50, 0.8);
    border-radius: 12px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.3);
    backdrop-filter: none;
    color: #E5E5E5;
}

:root:not([data-theme="light"]) .database-card:hover,
:root:not([data-theme="light"]) .database-card.card-hover-delay {
    background: rgba(35, 35, 35, 0.9);
    backdrop-filter: blur(8px);
    box-shadow: 0 6px 24px rgba(255, 208, 22, 0.15);
}

/* 高亮卡片（含地图上的副本）去掉磨砂透明，改为不透明；NHANES 副本暖色由上方 data-db 规则覆盖 */
.database-card.highlighted,
.database-card.card-copy {
    background: #fff;
    backdrop-filter: none;
}
:root:not([data-theme="light"]) .database-card.highlighted,
:root:not([data-theme="light"]) .database-card.card-copy {
    background: rgb(35, 35, 35);
    backdrop-filter: none;
}

/* 鼠标指向高亮卡片时，该卡片再放大一倍 */
.database-card.highlighted:hover {
    transform-origin: center center;
    z-index: 1002;
}
.database-card.card-copy:hover {
    transform-origin: top center;
    z-index: 1002;
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.15);
}
:root:not([data-theme="light"]) .database-card.card-copy:hover {
    box-shadow: 0 6px 24px rgba(255, 204, 0, 0.15);
}
.harmonized-card.highlighted:hover {
    transform-origin: center center;
    z-index: 1002;
}

.database-card:nth-child(1) { animation-delay: 0s; }
.database-card:nth-child(2) { animation-delay: 0.2s; }
.database-card:nth-child(3) { animation-delay: 0.4s; }
.database-card:nth-child(4) { animation-delay: 0.5s; }

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.database-card:hover,
.database-card.card-hover-delay {
    transform: translateY(-6px);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.15);
    border-color: #FFD016;
}

/* 白天模式下数据库卡片悬停：默认黄边，各库用下面 data-db 覆盖为主题色；:hover 与 .card-hover-delay 一致以便延迟期间保持主题色 */
:root[data-theme="light"] .database-card:hover,
:root[data-theme="light"] .database-card.card-hover-delay {
    border-color: rgba(255, 208, 22, 0.8);
}
/* 各库悬停边框主题色（含 .card-hover-delay，延迟期间不闪回黄色） */
:root[data-theme="light"] .database-card[data-db="NHANES"]:hover,
:root[data-theme="light"] .database-card[data-db="NHANES"].card-hover-delay {
    border-color: rgba(174, 77, 77, 0.8);
    box-shadow: 0 12px 32px rgba(174, 77, 77, 0.3);
}
:root[data-theme="light"] .database-card[data-db="CHARLS"]:hover,
:root[data-theme="light"] .database-card[data-db="CHARLS"].card-hover-delay {
    border-color: rgba(238, 130, 119, 0.8);
    box-shadow: 0 12px 32px rgba(238, 130, 119, 0.3);
}
:root[data-theme="light"] .database-card[data-db="ELSA"]:hover,
:root[data-theme="light"] .database-card[data-db="ELSA"].card-hover-delay {
    border-color: rgba(77, 160, 118, 0.8);
    box-shadow: 0 12px 32px rgba(77, 160, 118, 0.3);
}
:root[data-theme="light"] .database-card[data-db="CRELES"]:hover,
:root[data-theme="light"] .database-card[data-db="CRELES"].card-hover-delay {
    border-color: rgba(113, 183, 230, 0.8);
    box-shadow: 0 12px 32px rgba(113, 183, 230, 0.3);
}
:root[data-theme="light"] .database-card[data-db="RAND HRS"]:hover,
:root[data-theme="light"] .database-card[data-db="RAND HRS"].card-hover-delay {
    border-color: rgba(174, 77, 77, 0.8);
    box-shadow: 0 12px 32px rgba(174, 77, 77, 0.3);
}
:root[data-theme="light"] .database-card[data-db="Harmonized HRS"]:hover,
:root[data-theme="light"] .database-card[data-db="Harmonized HRS"].card-hover-delay {
    border-color: rgba(174, 77, 77, 0.8);
    box-shadow: 0 12px 32px rgba(174, 77, 77, 0.3);
}
:root[data-theme="light"] .database-card[data-db="Harmonized SHARE"]:hover,
:root[data-theme="light"] .database-card[data-db="Harmonized SHARE"].card-hover-delay {
    border-color: rgba(185, 139, 204, 0.8);
    box-shadow: 0 12px 32px rgba(185, 139, 204, 0.3);
}
:root[data-theme="light"] .database-card[data-db="Harmonized ELSA"]:hover,
:root[data-theme="light"] .database-card[data-db="Harmonized ELSA"].card-hover-delay {
    border-color: rgba(77, 160, 118, 0.8);
    box-shadow: 0 12px 32px rgba(77, 160, 118, 0.3);
}
:root[data-theme="light"] .database-card[data-db="Harmonized CHARLS"]:hover,
:root[data-theme="light"] .database-card[data-db="Harmonized CHARLS"].card-hover-delay {
    border-color: rgba(238, 130, 119, 0.8);
    box-shadow: 0 12px 32px rgba(238, 130, 119, 0.3);
}
:root[data-theme="light"] .database-card[data-db="Harmonized MHAS"]:hover,
:root[data-theme="light"] .database-card[data-db="Harmonized MHAS"].card-hover-delay {
    border-color: rgba(238, 156, 100, 0.8);
    box-shadow: 0 12px 32px rgba(238, 156, 100, 0.3);
}
:root[data-theme="light"] .database-card[data-db="Harmonized LASI"]:hover,
:root[data-theme="light"] .database-card[data-db="Harmonized LASI"].card-hover-delay {
    border-color: rgba(238, 208, 100, 0.8);
    box-shadow: 0 12px 32px rgba(238, 208, 100, 0.3);
}
:root[data-theme="light"] .database-card[data-db="Harmonized CRELES"]:hover,
:root[data-theme="light"] .database-card[data-db="Harmonized CRELES"].card-hover-delay {
    border-color: rgba(113, 183, 230, 0.8);
    box-shadow: 0 12px 32px rgba(113, 183, 230, 0.3);
}

/* harmonized 扑克牌内同上：默认黄边，各库 data-db 覆盖；含 .card-hover-delay 保持延迟期间主题色 */
:root[data-theme="light"] #harmonized-group .database-card:hover,
:root[data-theme="light"] #harmonized-group .database-card.card-hover-delay {
    border-color: rgba(255, 208, 22, 0.8);
}
:root[data-theme="light"] #harmonized-group .database-card[data-db="Harmonized HRS"]:hover,
:root[data-theme="light"] #harmonized-group .database-card[data-db="Harmonized HRS"].card-hover-delay {
    border-color: rgba(174, 77, 77, 0.8);
    box-shadow: 0 12px 32px rgba(174, 77, 77, 0.3);
}
:root[data-theme="light"] #harmonized-group .database-card[data-db="Harmonized SHARE"]:hover,
:root[data-theme="light"] #harmonized-group .database-card[data-db="Harmonized SHARE"].card-hover-delay {
    border-color: rgba(185, 139, 204, 0.8);
    box-shadow: 0 12px 32px rgba(185, 139, 204, 0.3);
}
:root[data-theme="light"] #harmonized-group .database-card[data-db="Harmonized ELSA"]:hover,
:root[data-theme="light"] #harmonized-group .database-card[data-db="Harmonized ELSA"].card-hover-delay {
    border-color: rgba(77, 160, 118, 0.8);
    box-shadow: 0 12px 32px rgba(77, 160, 118, 0.3);
}
:root[data-theme="light"] #harmonized-group .database-card[data-db="Harmonized CHARLS"]:hover,
:root[data-theme="light"] #harmonized-group .database-card[data-db="Harmonized CHARLS"].card-hover-delay {
    border-color: rgba(238, 130, 119, 0.8);
    box-shadow: 0 12px 32px rgba(238, 130, 119, 0.3);
}
:root[data-theme="light"] #harmonized-group .database-card[data-db="Harmonized MHAS"]:hover,
:root[data-theme="light"] #harmonized-group .database-card[data-db="Harmonized MHAS"].card-hover-delay {
    border-color: rgba(238, 156, 100, 0.8);
    box-shadow: 0 12px 32px rgba(238, 156, 100, 0.3);
}
:root[data-theme="light"] #harmonized-group .database-card[data-db="Harmonized LASI"]:hover,
:root[data-theme="light"] #harmonized-group .database-card[data-db="Harmonized LASI"].card-hover-delay {
    border-color: rgba(238, 208, 100, 0.8);
    box-shadow: 0 12px 32px rgba(238, 208, 100, 0.3);
}
:root[data-theme="light"] #harmonized-group .database-card[data-db="Harmonized CRELES"]:hover,
:root[data-theme="light"] #harmonized-group .database-card[data-db="Harmonized CRELES"].card-hover-delay {
    border-color: rgba(113, 183, 230, 0.8);
    box-shadow: 0 12px 32px rgba(113, 183, 230, 0.3);
}

.db-header {
    display: flex;
    align-items: center;
    gap: 25px;
    margin-bottom: 20px;
}

/* Harmonized卡片不显示图标 */
.harmonized-card .db-header {
    gap: 0;
}

/* Harmonized系列卡片：db-name字体小一号 */
.harmonized-card .db-name {
    font-size: 1.5rem;
}

.db-icon {
    font-size: 2.5rem;
    color: #FFD016;
    flex-shrink: 0;
    width: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.db-title {
    flex: 1;
}

.db-name {
    font-size: 1.8rem;
    font-weight: bold;
    color: var(--text-color);
    margin: 0 0 5px 0;
    translate: no;
}

.db-full-name {
    font-size: 0.9rem;
    color: var(--text-color);
    opacity: 0.7;
    margin: 0;
    font-style: italic;
    line-height: 1.5;
    height: calc(0.9rem * 1.5 * 2); /* font-size * line-height * 2 lines */
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.db-description {
    font-size: 0.95rem;
    color: var(--text-color);
    opacity: 0.8;
    line-height: 1.6;
    margin-bottom: 25px;
    flex: 1;
    text-align: center;
}

.db-stats {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
    margin-bottom: 25px;
    padding: 20px 0;
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.stat-item {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 30px;
    color: var(--text-color);
    padding: 0px;
    border-radius: 6px;
}

.stat-item .stat-label {
    font-size: 0.9rem;
    opacity: 0.7;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 80px;
    flex-shrink: 0;
}

/* 值部分（类似stat-info）- 80px宽度，垂直居中 */
.stat-item .stat-value {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-color);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    width: 80px;
    flex-shrink: 0;
}

.db-actions {
    display: flex;
    flex-wrap: nowrap;
    gap: 12px;
    margin-top: auto;
}

.explore-btn,
.notes-btn {
    flex: 1;
    padding: 12px 10px;
    border-radius: 6px;
    text-decoration: none;
    text-align: center;
    font-size: 0.95rem;
    font-weight: 500;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    white-space: nowrap;
    min-width: 0;
}

.explore-btn {
    background: #FFD016;
    color: #2C2C2C;
    border: 1px solid #FFD01650;
}

.explore-btn:hover {
    background: #ffc400;
    color: #2C2C2C;
}

/* 单波数据系列 - 根据数据库设置对应颜色（仅在白天模式生效） */
/* 使用70%原色+30%白色的混合色 */
/* NHANES (美国) - 深红色 */
:root[data-theme="light"] .database-card[data-db="NHANES"] .explore-btn {
    background: color-mix(in srgb, var(--color-usa) 70%, white 30%);
    color: #ffffff;
    border-color: var(--color-usa-border);
}

:root[data-theme="light"] .database-card[data-db="NHANES"] .explore-btn:hover {
    background: color-mix(in srgb, var(--color-usa-hover) 70%, white 30%);
    color: #ffffff;
}

/* CHARLS (中国) - 红色 */
:root[data-theme="light"] .database-card[data-db="CHARLS"] .explore-btn {
    background: color-mix(in srgb, var(--color-china) 70%, white 30%);
    color: #ffffff;
    border-color: var(--color-china-border);
}

:root[data-theme="light"] .database-card[data-db="CHARLS"] .explore-btn:hover {
    background: color-mix(in srgb, var(--color-china-hover) 70%, white 30%);
    color: #ffffff;
}

/* ELSA (英国) - 绿色 */
:root[data-theme="light"] .database-card[data-db="ELSA"] .explore-btn {
    background: color-mix(in srgb, var(--color-uk) 70%, white 30%);
    color: #ffffff;
    border-color: var(--color-uk-border);
}

:root[data-theme="light"] .database-card[data-db="ELSA"] .explore-btn:hover {
    background: color-mix(in srgb, var(--color-uk-hover) 70%, white 30%);
    color: #ffffff;
}

/* CRELES (哥斯达黎加) - 蓝色 */
:root[data-theme="light"] .database-card[data-db="CRELES"] .explore-btn {
    background: color-mix(in srgb, var(--color-costa-rica) 70%, white 30%);
    color: #ffffff;
    border-color: var(--color-costa-rica-border);
}

:root[data-theme="light"] .database-card[data-db="CRELES"] .explore-btn:hover {
    background: color-mix(in srgb, var(--color-costa-rica-hover) 70%, white 30%);
    color: #ffffff;
}

/* Harmonized系列 - 根据数据库设置对应颜色（仅在白天模式生效） */
/* 使用70%原色+30%白色的混合色 */
/* RAND HRS (美国) - 深红色 */
:root[data-theme="light"] .database-card[data-db="RAND HRS"] .explore-btn {
    background: color-mix(in srgb, var(--color-usa) 70%, white 30%);
    color: #ffffff;
    border-color: var(--color-usa-border);
}

:root[data-theme="light"] .database-card[data-db="RAND HRS"] .explore-btn:hover {
    background: color-mix(in srgb, var(--color-usa-hover) 70%, white 30%);
    color: #ffffff;
}

/* Harmonized HRS (美国) - 深红色 */
:root[data-theme="light"] .database-card[data-db="Harmonized HRS"] .explore-btn {
    background: color-mix(in srgb, var(--color-usa) 70%, white 30%);
    color: #ffffff;
    border-color: var(--color-usa-border);
}

:root[data-theme="light"] .database-card[data-db="Harmonized HRS"] .explore-btn:hover {
    background: color-mix(in srgb, var(--color-usa-hover) 70%, white 30%);
    color: #ffffff;
}

/* Harmonized SHARE (欧洲) - 紫色 */
:root[data-theme="light"] .database-card[data-db="Harmonized SHARE"] .explore-btn {
    background: color-mix(in srgb, var(--color-europe) 70%, white 30%);
    color: #ffffff;
    border-color: var(--color-europe-border);
}

:root[data-theme="light"] .database-card[data-db="Harmonized SHARE"] .explore-btn:hover {
    background: color-mix(in srgb, var(--color-europe-hover) 70%, white 30%);
    color: #ffffff;
}

/* Harmonized ELSA (英国) - 绿色 */
:root[data-theme="light"] .database-card[data-db="Harmonized ELSA"] .explore-btn {
    background: color-mix(in srgb, var(--color-uk) 70%, white 30%);
    color: #ffffff;
    border-color: var(--color-uk-border);
}

:root[data-theme="light"] .database-card[data-db="Harmonized ELSA"] .explore-btn:hover {
    background: color-mix(in srgb, var(--color-uk-hover) 70%, white 30%);
    color: #ffffff;
}

/* Harmonized CHARLS (中国) - 红色 */
:root[data-theme="light"] .database-card[data-db="Harmonized CHARLS"] .explore-btn {
    background: color-mix(in srgb, var(--color-china) 70%, white 30%);
    color: #ffffff;
    border-color: var(--color-china-border);
}

:root[data-theme="light"] .database-card[data-db="Harmonized CHARLS"] .explore-btn:hover {
    background: color-mix(in srgb, var(--color-china-hover) 70%, white 30%);
    color: #ffffff;
}

/* Harmonized MHAS (墨西哥) - 橙色 */
:root[data-theme="light"] .database-card[data-db="Harmonized MHAS"] .explore-btn {
    background: color-mix(in srgb, var(--color-mexico) 70%, white 30%);
    color: #ffffff;
    border-color: var(--color-mexico-border);
}

:root[data-theme="light"] .database-card[data-db="Harmonized MHAS"] .explore-btn:hover {
    background: color-mix(in srgb, var(--color-mexico-hover) 70%, white 30%);
    color: #ffffff;
}

/* Harmonized LASI (印度) - 黄色 */
:root[data-theme="light"] .database-card[data-db="Harmonized LASI"] .explore-btn {
    background: color-mix(in srgb, var(--color-india) 70%, white 30%);
    color: #2C2C2C;
    border-color: var(--color-india-border);
}

:root[data-theme="light"] .database-card[data-db="Harmonized LASI"] .explore-btn:hover {
    background: color-mix(in srgb, var(--color-india-hover) 70%, white 30%);
    color: #2C2C2C;
}

/* Harmonized CRELES (哥斯达黎加) - 蓝色 */
:root[data-theme="light"] .database-card[data-db="Harmonized CRELES"] .explore-btn {
    background: color-mix(in srgb, var(--color-costa-rica) 70%, white 30%);
    color: #ffffff;
    border-color: var(--color-costa-rica-border);
}

:root[data-theme="light"] .database-card[data-db="Harmonized CRELES"] .explore-btn:hover {
    background: color-mix(in srgb, var(--color-costa-rica-hover) 70%, white 30%);
    color: #ffffff;
}

.notes-btn {
    background: transparent;
    color: var(--text-color);
    border: 1px solid #C6C6C650;
}

.notes-btn:hover {
    background: #88888830;
    border-color: var(--border-color);
    color: var(--text-color);
}

.notes-btn.disabled {
    opacity: 0.4;
    cursor: not-allowed;
    pointer-events: none;
    background: rgba(0, 0, 0, 0.05) !important;
    border-color: rgba(0, 0, 0, 0.1) !important;
    color: var(--text-color) !important;
}

.notes-btn.disabled:hover {
    background: rgba(0, 0, 0, 0.05) !important;
    border-color: rgba(0, 0, 0, 0.1) !important;
    color: var(--text-color) !important;
    opacity: 0.4;
}

/* 黑夜模式下的禁用样式 */
:root:not([data-theme="light"]) .notes-btn.disabled {
    background: rgba(255, 255, 255, 0.05) !important;
    border-color: rgba(255, 255, 255, 0.1) !important;
    opacity: 0.4 !important;
}

:root:not([data-theme="light"]) .notes-btn.disabled:hover {
    background: rgba(255, 255, 255, 0.05) !important;
    border-color: rgba(255, 255, 255, 0.1) !important;
    opacity: 0.4 !important;
}

/* 白天模式下笔记按钮图标颜色 - 根据数据库设置对应颜色（70%原色+30%白色） */
/* 单波数据系列 */
/* NHANES (美国) - 深红色 */
:root[data-theme="light"] .database-card[data-db="NHANES"] .notes-btn i.fas.fa-book {
    color: color-mix(in srgb, var(--color-usa) 70%, white 30%);
}

/* CHARLS (中国) - 红色 */
:root[data-theme="light"] .database-card[data-db="CHARLS"] .notes-btn i.fas.fa-book {
    color: color-mix(in srgb, var(--color-china) 70%, white 30%);
}

/* ELSA (英国) - 绿色 */
:root[data-theme="light"] .database-card[data-db="ELSA"] .notes-btn i.fas.fa-book {
    color: color-mix(in srgb, var(--color-uk) 70%, white 30%);
}

/* CRELES (哥斯达黎加) - 蓝色 */
:root[data-theme="light"] .database-card[data-db="CRELES"] .notes-btn i.fas.fa-book {
    color: color-mix(in srgb, var(--color-costa-rica) 70%, white 30%);
}

/* Harmonized系列 */
/* RAND HRS (美国) - 深红色 */
:root[data-theme="light"] .database-card[data-db="RAND HRS"] .notes-btn i.fas.fa-book {
    color: color-mix(in srgb, var(--color-usa) 70%, white 30%);
}

/* Harmonized HRS (美国) - 深红色 */
:root[data-theme="light"] .database-card[data-db="Harmonized HRS"] .notes-btn i.fas.fa-book {
    color: color-mix(in srgb, var(--color-usa) 70%, white 30%);
}

/* Harmonized SHARE (欧洲) - 紫色 */
:root[data-theme="light"] .database-card[data-db="Harmonized SHARE"] .notes-btn i.fas.fa-book {
    color: color-mix(in srgb, var(--color-europe) 70%, white 30%);
}

/* Harmonized ELSA (英国) - 绿色 */
:root[data-theme="light"] .database-card[data-db="Harmonized ELSA"] .notes-btn i.fas.fa-book {
    color: color-mix(in srgb, var(--color-uk) 70%, white 30%);
}

/* Harmonized CHARLS (中国) - 红色 */
:root[data-theme="light"] .database-card[data-db="Harmonized CHARLS"] .notes-btn i.fas.fa-book {
    color: color-mix(in srgb, var(--color-china) 70%, white 30%);
}

/* Harmonized MHAS (墨西哥) - 橙色 */
:root[data-theme="light"] .database-card[data-db="Harmonized MHAS"] .notes-btn i.fas.fa-book {
    color: color-mix(in srgb, var(--color-mexico) 70%, white 30%);
}

/* Harmonized LASI (印度) - 黄色 */
:root[data-theme="light"] .database-card[data-db="Harmonized LASI"] .notes-btn i.fas.fa-book {
    color: color-mix(in srgb, var(--color-india) 70%, white 30%);
}

/* Harmonized CRELES (哥斯达黎加) - 蓝色 */
:root[data-theme="light"] .database-card[data-db="Harmonized CRELES"] .notes-btn i.fas.fa-book {
    color: color-mix(in srgb, var(--color-costa-rica) 70%, white 30%);
}

/* 白天模式下笔记按钮图标hover状态颜色 */
/* 单波数据系列 */
/* NHANES (美国) - 深红色 */
:root[data-theme="light"] .database-card[data-db="NHANES"] .notes-btn:hover i.fas.fa-book {
    color: color-mix(in srgb, var(--color-usa-hover) 70%, white 30%);
}

/* CHARLS (中国) - 红色 */
:root[data-theme="light"] .database-card[data-db="CHARLS"] .notes-btn:hover i.fas.fa-book {
    color: color-mix(in srgb, var(--color-china-hover) 70%, white 30%);
}

/* ELSA (英国) - 绿色 */
:root[data-theme="light"] .database-card[data-db="ELSA"] .notes-btn:hover i.fas.fa-book {
    color: color-mix(in srgb, var(--color-uk-hover) 70%, white 30%);
}

/* CRELES (哥斯达黎加) - 蓝色 */
:root[data-theme="light"] .database-card[data-db="CRELES"] .notes-btn:hover i.fas.fa-book {
    color: color-mix(in srgb, var(--color-costa-rica-hover) 70%, white 30%);
}

/* Harmonized系列 */
/* RAND HRS (美国) - 深红色 */
:root[data-theme="light"] .database-card[data-db="RAND HRS"] .notes-btn:hover i.fas.fa-book {
    color: color-mix(in srgb, var(--color-usa-hover) 70%, white 30%);
}

/* Harmonized HRS (美国) - 深红色 */
:root[data-theme="light"] .database-card[data-db="Harmonized HRS"] .notes-btn:hover i.fas.fa-book {
    color: color-mix(in srgb, var(--color-usa-hover) 70%, white 30%);
}

/* Harmonized SHARE (欧洲) - 紫色 */
:root[data-theme="light"] .database-card[data-db="Harmonized SHARE"] .notes-btn:hover i.fas.fa-book {
    color: color-mix(in srgb, var(--color-europe-hover) 70%, white 30%);
}

/* Harmonized ELSA (英国) - 绿色 */
:root[data-theme="light"] .database-card[data-db="Harmonized ELSA"] .notes-btn:hover i.fas.fa-book {
    color: color-mix(in srgb, var(--color-uk-hover) 70%, white 30%);
}

/* Harmonized CHARLS (中国) - 红色 */
:root[data-theme="light"] .database-card[data-db="Harmonized CHARLS"] .notes-btn:hover i.fas.fa-book {
    color: color-mix(in srgb, var(--color-china-hover) 70%, white 30%);
}

/* Harmonized MHAS (墨西哥) - 橙色 */
:root[data-theme="light"] .database-card[data-db="Harmonized MHAS"] .notes-btn:hover i.fas.fa-book {
    color: color-mix(in srgb, var(--color-mexico-hover) 70%, white 30%);
}

/* Harmonized LASI (印度) - 黄色 */
:root[data-theme="light"] .database-card[data-db="Harmonized LASI"] .notes-btn:hover i.fas.fa-book {
    color: color-mix(in srgb, var(--color-india-hover) 70%, white 30%);
}

/* Harmonized CRELES (哥斯达黎加) - 蓝色 */
:root[data-theme="light"] .database-card[data-db="Harmonized CRELES"] .notes-btn:hover i.fas.fa-book {
    color: color-mix(in srgb, var(--color-costa-rica-hover) 70%, white 30%);
}

/* 探索路径推荐 */
.exploration-paths {
    padding: 80px 0;
    background: var(--light-bg);
}

.paths-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 30px;
}

.path-card {
    background: var(--main-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 30px;
    text-align: center;
    transition: all 0.3s ease;
    animation: fadeInUp 0.6s ease-out;
    animation-fill-mode: both;
}

.path-card:nth-child(1) { animation-delay: 0.1s; }
.path-card:nth-child(2) { animation-delay: 0.2s; }
.path-card:nth-child(3) { animation-delay: 0.3s; }
.path-card:nth-child(4) { animation-delay: 0.4s; }

.path-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.15);
    border-color: #FFD016;
}

.path-icon {
    font-size: 3rem;
    color: #FFD016;
    margin-bottom: 20px;
}

.path-title {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 15px;
}

.path-description {
    font-size: 0.95rem;
    color: var(--text-color);
    opacity: 0.8;
    line-height: 1.6;
    margin-bottom: 25px;
}

.path-link {
    display: inline-block;
    color: #FFD016;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
}

.path-link:hover {
    color: #E6C212;
    transform: translateX(4px);
}

/* 知识发现区 */
.knowledge-section {
    background: var(--main-bg);
}

.knowledge-windows {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-bottom: 50px;
}

.knowledge-window {
    position: relative;
    background: transparent;
    border: none;
    border-radius: 0;
    padding: 0;
    min-height: 250px;
    overflow: visible;
    box-shadow: none;
}

/* 黑夜模式下的knowledge-window样式 */
:root:not([data-theme="light"]) .knowledge-window {
    background: transparent !important;
    border: none !important;
}

.knowledge-badge {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 0.85rem;
    font-weight: 600;
    background: #FFD016;
    color: #2C2C2C;
    white-space: nowrap;
    flex-shrink: 0;
    text-decoration: none;
    transition: background-color 0.2s ease;
    cursor: pointer;
}

.knowledge-badge:hover {
    background: #ffc400;
}

/* 白天模式下knowledge-badge根据类别设置对应颜色（70%原色+30%白色） */
/* 单波数据系列 */
/* NHANES (美国) - 深红色 */
:root[data-theme="light"] .knowledge-window[data-category="NHANES"] .knowledge-badge {
    background: color-mix(in srgb, var(--color-usa) 70%, white 30%);
    color: #ffffff;
}

:root[data-theme="light"] .knowledge-window[data-category="NHANES"] .knowledge-badge:hover {
    background: color-mix(in srgb, var(--color-usa-hover) 70%, white 30%);
    color: #ffffff;
}

/* CHARLS (中国) - 红色 */
:root[data-theme="light"] .knowledge-window[data-category="CHARLS"] .knowledge-badge {
    background: color-mix(in srgb, var(--color-china) 70%, white 30%);
    color: #ffffff;
}

:root[data-theme="light"] .knowledge-window[data-category="CHARLS"] .knowledge-badge:hover {
    background: color-mix(in srgb, var(--color-china-hover) 70%, white 30%);
    color: #ffffff;
}

/* ELSA (英国) - 绿色 */
:root[data-theme="light"] .knowledge-window[data-category="ELSA"] .knowledge-badge {
    background: color-mix(in srgb, var(--color-uk) 70%, white 30%);
    color: #ffffff;
}

:root[data-theme="light"] .knowledge-window[data-category="ELSA"] .knowledge-badge:hover {
    background: color-mix(in srgb, var(--color-uk-hover) 70%, white 30%);
    color: #ffffff;
}

/* ELSA COVID */
:root[data-theme="light"] .knowledge-window[data-category="ELSA COVID"] .knowledge-badge {
    background: color-mix(in srgb, var(--color-uk) 70%, white 30%);
    color: #ffffff;
}

:root[data-theme="light"] .knowledge-window[data-category="ELSA COVID"] .knowledge-badge:hover {
    background: color-mix(in srgb, var(--color-uk-hover) 70%, white 30%);
    color: #ffffff;
}

/* CRELES (哥斯达黎加) - 蓝色 */
:root[data-theme="light"] .knowledge-window[data-category="CRELES"] .knowledge-badge {
    background: color-mix(in srgb, var(--color-costa-rica) 70%, white 30%);
    color: #ffffff;
}

:root[data-theme="light"] .knowledge-window[data-category="CRELES"] .knowledge-badge:hover {
    background: color-mix(in srgb, var(--color-costa-rica-hover) 70%, white 30%);
    color: #ffffff;
}

/* Harmonized系列 */
/* RAND HRS (美国) - 深红色 */
:root[data-theme="light"] .knowledge-window[data-category="RAND HRS"] .knowledge-badge {
    background: color-mix(in srgb, var(--color-usa) 70%, white 30%);
    color: #ffffff;
}

:root[data-theme="light"] .knowledge-window[data-category="RAND HRS"] .knowledge-badge:hover {
    background: color-mix(in srgb, var(--color-usa-hover) 70%, white 30%);
    color: #ffffff;
}

/* Harmonized HRS (美国) - 深红色 */
:root[data-theme="light"] .knowledge-window[data-category="Harmonized HRS"] .knowledge-badge {
    background: color-mix(in srgb, var(--color-usa) 70%, white 30%);
    color: #ffffff;
}

:root[data-theme="light"] .knowledge-window[data-category="Harmonized HRS"] .knowledge-badge:hover {
    background: color-mix(in srgb, var(--color-usa-hover) 70%, white 30%);
    color: #ffffff;
}

/* Harmonized SHARE (欧洲) - 紫色 */
:root[data-theme="light"] .knowledge-window[data-category="Harmonized SHARE"] .knowledge-badge {
    background: color-mix(in srgb, var(--color-europe) 70%, white 30%);
    color: #ffffff;
}

:root[data-theme="light"] .knowledge-window[data-category="Harmonized SHARE"] .knowledge-badge:hover {
    background: color-mix(in srgb, var(--color-europe-hover) 70%, white 30%);
    color: #ffffff;
}

/* Harmonized ELSA (英国) - 绿色 */
:root[data-theme="light"] .knowledge-window[data-category="Harmonized ELSA"] .knowledge-badge {
    background: color-mix(in srgb, var(--color-uk) 70%, white 30%);
    color: #ffffff;
}

:root[data-theme="light"] .knowledge-window[data-category="Harmonized ELSA"] .knowledge-badge:hover {
    background: color-mix(in srgb, var(--color-uk-hover) 70%, white 30%);
    color: #ffffff;
}

/* Harmonized CHARLS (中国) - 红色 */
:root[data-theme="light"] .knowledge-window[data-category="Harmonized CHARLS"] .knowledge-badge {
    background: color-mix(in srgb, var(--color-china) 70%, white 30%);
    color: #ffffff;
}

:root[data-theme="light"] .knowledge-window[data-category="Harmonized CHARLS"] .knowledge-badge:hover {
    background: color-mix(in srgb, var(--color-china-hover) 70%, white 30%);
    color: #ffffff;
}

/* Harmonized MHAS (墨西哥) - 橙色 */
:root[data-theme="light"] .knowledge-window[data-category="Harmonized MHAS"] .knowledge-badge {
    background: color-mix(in srgb, var(--color-mexico) 70%, white 30%);
    color: #ffffff;
}

:root[data-theme="light"] .knowledge-window[data-category="Harmonized MHAS"] .knowledge-badge:hover {
    background: color-mix(in srgb, var(--color-mexico-hover) 70%, white 30%);
    color: #ffffff;
}

/* Harmonized LASI (印度) - 黄色 */
:root[data-theme="light"] .knowledge-window[data-category="Harmonized LASI"] .knowledge-badge {
    background: color-mix(in srgb, var(--color-india) 70%, white 30%);
    color: #2C2C2C;
}

:root[data-theme="light"] .knowledge-window[data-category="Harmonized LASI"] .knowledge-badge:hover {
    background: color-mix(in srgb, var(--color-india-hover) 70%, white 30%);
    color: #2C2C2C;
}

/* Harmonized CRELES (哥斯达黎加) - 蓝色 */
:root[data-theme="light"] .knowledge-window[data-category="Harmonized CRELES"] .knowledge-badge {
    background: color-mix(in srgb, var(--color-costa-rica) 70%, white 30%);
    color: #ffffff;
}

:root[data-theme="light"] .knowledge-window[data-category="Harmonized CRELES"] .knowledge-badge:hover {
    background: color-mix(in srgb, var(--color-costa-rica-hover) 70%, white 30%);
    color: #ffffff;
}

.knowledge-window-container {
    position: relative;
    overflow: hidden;
    height: 380px; /* 容纳卡片所有内容：200px封面 + 35px内容padding + 35px meta + 48px title + 45px footer + 约17px余量 */
    margin-top: 0;
    padding: 15px;
}

.knowledge-window-track {
    position: relative;
    width: 100%;
    height: 100%;
}

.knowledge-card {
    background: var(--light-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 0;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    animation: fadeInUp 0.6s ease-out;
    animation-fill-mode: both;
    text-decoration: none;
    color: inherit;
    cursor: pointer;
    flex: 0 0 auto;
    overflow: hidden;
}

/* 窗口内的小卡片样式 - 堆叠效果 */
.knowledge-window-track .knowledge-card {
    position: absolute;
    top: 0;
    left: 0;
    width: calc(100% - 25px);
    animation: none;
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    overflow: hidden;
    transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.6s ease;
    will-change: transform, opacity;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    transform: translateZ(0);
    -webkit-transform: translateZ(0);
    display: flex;
    flex-direction: column;
    min-height: 240px; /* 与笔记卡片最低高度对齐（200px封面 + 40px内容padding） */
    height: auto; /* 允许卡片根据内容自动调整高度 */
}

/* 知识卡片封面 */
.knowledge-cover {
    width: 100%;
    height: 200px;
    overflow: hidden;
    flex-shrink: 0;
}

.knowledge-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
    background-color: #FFFFFF;
}

:root:not([data-theme="light"]) .knowledge-cover img {
    background-color: #2C2C2C;
}

.knowledge-card:hover .knowledge-cover img {
    transform: scale(1.05);
}

/* 知识卡片内容包装器 */
.knowledge-content-wrapper {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-height: 0;
}

/* 如果没有封面，内容区域占满整个卡片，但预留封面位置 */
.knowledge-card > .knowledge-content-wrapper {
    padding: 20px;
    position: relative;
}

/* 当没有封面时，使用伪元素预留200px的封面位置 */
.knowledge-card > .knowledge-content-wrapper::before {
    content: '';
    display: block;
    width: calc(100% + 40px); /* 抵消左右padding */
    height: 200px;
    flex-shrink: 0;
    margin: -20px -20px 0 -20px; /* 抵消上左右padding，底部不留margin */
    background-color: transparent;
    box-sizing: border-box;
}

/* 有封面时，隐藏预留空间的伪元素 */
.knowledge-card .knowledge-cover + .knowledge-content-wrapper::before {
    display: none;
}

/* 有封面时，内容区域的padding调整 */
.knowledge-card .knowledge-cover + .knowledge-content-wrapper {
    padding: 15px 20px 20px 20px;
}

/* 卡片堆叠样式由JavaScript动态设置 */

/* 当卡片被移走时（active状态）- 向左上切走并淡出 */
.knowledge-window-track .knowledge-card.active {
    transform: translate(-100%, -100%) translateZ(0) !important;
    opacity: 0 !important;
    z-index: 20 !important;
    pointer-events: none !important;
    transition: transform 0.4s ease-out, opacity 0.4s ease-out !important;
}

/* 黑夜模式下的知识卡片样式（参考笔记卡片） */
:root:not([data-theme="light"]) .knowledge-card {
    background: rgba(45, 45, 45, 0.95);
    border: 1px solid rgba(70, 70, 70, 0.8);
    border-radius: 12px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.3);
    backdrop-filter: blur(8px);
    color: #E5E5E5;
}

:root:not([data-theme="light"]) .knowledge-card:hover {
    background: rgba(50, 50, 50, 0.98);
    box-shadow: 0 6px 24px rgba(255, 208, 22, 0.15);
}

.knowledge-card:nth-child(1) { animation-delay: 0.1s; }
.knowledge-card:nth-child(2) { animation-delay: 0.2s; }
.knowledge-card:nth-child(3) { animation-delay: 0.3s; }
.knowledge-card:nth-child(4) { animation-delay: 0.4s; }
.knowledge-card:nth-child(5) { animation-delay: 0.5s; }
.knowledge-card:nth-child(6) { animation-delay: 0.6s; }

.knowledge-card.featured {
    border-color: #FFD016;
    border-width: 2px;
    box-shadow: 0 4px 16px rgba(255, 208, 22, 0.2);
}

.knowledge-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 20px rgba(255, 208, 22, 0.15);
    border-color: #FFD016;
}

/* 白天模式下knowledge-card根据类别设置对应的悬停效果（70%原色+30%白色） */
/* 如果没有对应类别，使用默认的黄色 */
/* 单波数据系列 */
/* NHANES (美国) - 深红色 */
:root[data-theme="light"] .knowledge-window[data-category="NHANES"] .knowledge-card:hover {
    border-color: color-mix(in srgb, var(--color-usa) 70%, white 30%);
    box-shadow: 0 8px 20px rgba(174, 77, 77, 0.15);
}

/* CHARLS (中国) - 红色 */
:root[data-theme="light"] .knowledge-window[data-category="CHARLS"] .knowledge-card:hover {
    border-color: color-mix(in srgb, var(--color-china) 70%, white 30%);
    box-shadow: 0 8px 20px rgba(238, 130, 119, 0.15);
}

/* ELSA (英国) - 绿色 */
:root[data-theme="light"] .knowledge-window[data-category="ELSA"] .knowledge-card:hover {
    border-color: color-mix(in srgb, var(--color-uk) 70%, white 30%);
    box-shadow: 0 8px 20px rgba(77, 160, 118, 0.15);
}

/* ELSA COVID */
:root[data-theme="light"] .knowledge-window[data-category="ELSA COVID"] .knowledge-card:hover {
    border-color: color-mix(in srgb, var(--color-uk) 70%, white 30%);
    box-shadow: 0 8px 20px rgba(77, 160, 118, 0.15);
}

/* CRELES (哥斯达黎加) - 蓝色 */
:root[data-theme="light"] .knowledge-window[data-category="CRELES"] .knowledge-card:hover {
    border-color: color-mix(in srgb, var(--color-costa-rica) 70%, white 30%);
    box-shadow: 0 8px 20px rgba(113, 183, 230, 0.15);
}

/* Harmonized系列 */
/* RAND HRS (美国) - 深红色 */
:root[data-theme="light"] .knowledge-window[data-category="RAND HRS"] .knowledge-card:hover {
    border-color: color-mix(in srgb, var(--color-usa) 70%, white 30%);
    box-shadow: 0 8px 20px rgba(174, 77, 77, 0.15);
}

/* Harmonized HRS (美国) - 深红色 */
:root[data-theme="light"] .knowledge-window[data-category="Harmonized HRS"] .knowledge-card:hover {
    border-color: color-mix(in srgb, var(--color-usa) 70%, white 30%);
    box-shadow: 0 8px 20px rgba(174, 77, 77, 0.15);
}

/* Harmonized SHARE (欧洲) - 紫色 */
:root[data-theme="light"] .knowledge-window[data-category="Harmonized SHARE"] .knowledge-card:hover {
    border-color: color-mix(in srgb, var(--color-europe) 70%, white 30%);
    box-shadow: 0 8px 20px rgba(185, 139, 204, 0.15);
}

/* Harmonized ELSA (英国) - 绿色 */
:root[data-theme="light"] .knowledge-window[data-category="Harmonized ELSA"] .knowledge-card:hover {
    border-color: color-mix(in srgb, var(--color-uk) 70%, white 30%);
    box-shadow: 0 8px 20px rgba(77, 160, 118, 0.15);
}

/* Harmonized CHARLS (中国) - 红色 */
:root[data-theme="light"] .knowledge-window[data-category="Harmonized CHARLS"] .knowledge-card:hover {
    border-color: color-mix(in srgb, var(--color-china) 70%, white 30%);
    box-shadow: 0 8px 20px rgba(238, 130, 119, 0.15);
}

/* Harmonized MHAS (墨西哥) - 橙色 */
:root[data-theme="light"] .knowledge-window[data-category="Harmonized MHAS"] .knowledge-card:hover {
    border-color: color-mix(in srgb, var(--color-mexico) 70%, white 30%);
    box-shadow: 0 8px 20px rgba(238, 156, 100, 0.15);
}

/* Harmonized LASI (印度) - 黄色 */
:root[data-theme="light"] .knowledge-window[data-category="Harmonized LASI"] .knowledge-card:hover {
    border-color: color-mix(in srgb, var(--color-india) 70%, white 30%);
    box-shadow: 0 8px 20px rgba(238, 208, 100, 0.15);
}

/* Harmonized CRELES (哥斯达黎加) - 蓝色 */
:root[data-theme="light"] .knowledge-window[data-category="Harmonized CRELES"] .knowledge-card:hover {
    border-color: color-mix(in srgb, var(--color-costa-rica) 70%, white 30%);
    box-shadow: 0 8px 20px rgba(113, 183, 230, 0.15);
}

.knowledge-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 12px;
    margin-bottom: 12px;
    font-size: 0.85rem;
}

.knowledge-meta-left {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: nowrap;
    overflow: hidden;
    max-width: calc(100% - 100px); /* 为日期预留空间 */
}

.knowledge-db {
    background: #FFD016;
    color: #2C2C2C;
    padding: 4px 12px;
    border-radius: 12px;
    font-weight: 500;
    translate: no;
}

.knowledge-date {
    color: var(--text-color);
    opacity: 0.6;
}

.knowledge-title {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-color);
    margin: 0px;
    overflow: hidden;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
    line-height: 1.5;
    max-height: calc(1.2rem * 1.5 * 2); /* font-size * line-height * 2 lines */
}

.knowledge-tags {
    display: flex;
    flex-wrap: nowrap;
    gap: 8px;
    overflow: hidden;
    max-width: 100%;
}

.knowledge-tags .tag {
    background: #f8f8f8 !important;
    background-color: #f8f8f8 !important;
    padding: 2px 6px !important;
    border-radius: 3px !important;
    font-size: 0.85em !important;
    cursor: pointer !important;
    transition: background-color 0.2s !important;
    color: #999999 !important;
    border: none !important;
    display: inline-block !important;
    margin: 0 !important;
    width: auto !important;
    box-sizing: border-box !important;
    position: static !important;
    align-items: unset !important;
    justify-content: unset !important;
    white-space: nowrap !important;
    flex-shrink: 0 !important;
}

.knowledge-tags .tag:hover {
    background: #e8e8e8 !important;
    background-color: #e8e8e8 !important;
}

/* 黑夜模式下的knowledge-tags .tag样式 */
:root:not([data-theme="light"]) .knowledge-tags .tag {
    background: rgba(80, 80, 80, 0.8) !important;
    background-color: rgba(80, 80, 80, 0.8) !important;
    color: #999999 !important;
}

:root:not([data-theme="light"]) .knowledge-tags .tag:hover {
    background: rgba(90, 90, 90, 0.9) !important;
    background-color: rgba(90, 90, 90, 0.9) !important;
}

.knowledge-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 15px;
    border-top: 1px solid var(--border-color);
    margin-top: auto;
}

.knowledge-stats {
    display: flex;
    gap: 15px;
    font-size: 0.9rem;
    color: var(--text-color);
    opacity: 0.7;
}

.knowledge-stats i {
    margin-right: 4px;
}

.knowledge-author {
    font-size: 0.9rem;
    color: var(--text-color);
    opacity: 0.7;
}

.view-all {
    text-align: center;
    margin-top: 40px;
}

.view-all-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 30px;
    background: #FFD016;
    color: #2C2C2C;
    text-decoration: none;
    border-radius: 12px;
    font-weight: 500;
    transition: all 0.3s ease;
    border: 1px solid #FFD01650;
}

.view-all-btn:hover {
    background: #ffc400;
    color: #2C2C2C;
}

/* 平台理念说明区 */
.philosophy-section {
    padding: 80px 0;
    background: var(--light-bg);
}

.philosophy-content {
    max-width: 1200px;
    margin: 0 auto;
}

.philosophy-title {
    font-size: 2.5rem;
    font-weight: bold;
    color: var(--text-color);
    text-align: center;
    margin-bottom: 60px;
}

.philosophy-points {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
}

.philosophy-point {
    text-align: center;
}

.point-icon {
    font-size: 3.5rem;
    color: #FFD016;
    margin-bottom: 25px;
}

.philosophy-point h3 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 20px;
}

.philosophy-point p {
    font-size: 1rem;
    color: var(--text-color);
    opacity: 0.8;
    line-height: 1.8;
    text-align: left;
}

/* 主题切换按钮样式 */
.theme-toggle {
    position: fixed;
    bottom: 20px;
    right: 20px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    border: none;
    background: transparent;
    color: #FFD016;
    font-size: 20px;
    cursor: pointer;
    z-index: 1000;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.theme-toggle:hover {
    transform: translateY(-2px);
}

/* 图标放大动画 */
.theme-toggle i {
    transition: transform 0.3s ease;
}

.theme-toggle:hover i {
    transform: scale(2);
}

/* ======================= */
/* 主页底栏 site-footer */
/* ======================= */
.site-footer {
    background: var(--main-bg);
    margin-top: 0;
    position: relative;
}

/* 顶部分割线：中间不透明、向两端透明渐变（仅此一条线） */
.site-footer::before {
    content: '';
    position: absolute;
    left: 0;
    right: 0;
    top: 0;
    height: 1px;
    background: linear-gradient(to right, transparent 0%, var(--border-color) 25%, var(--border-color) 75%, transparent 100%);
    pointer-events: none;
}

.site-footer__container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 24px 20px;
}

.site-footer__bottom {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: 12px 20px;
    font-size: 13px;
    color: var(--text-color);
    opacity: 0.85;
}

.site-footer__bottom a {
    color: var(--text-color);
    text-decoration: none;
}

.site-footer__bottom a:hover {
    text-decoration: underline;
}

.site-footer__icp {
    opacity: 0.75;
}

/* 回到顶部按钮 - 与笔记 post 页一致 */
.back-to-top {
    position: fixed;
    bottom: 80px;
    right: 20px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    border: 1px solid var(--primary, #ca0c16);
    background: transparent;
    color: var(--primary, #ca0c16);
    font-size: 20px;
    cursor: pointer;
    z-index: 1002;
    transition: all 0.3s ease;
    display: none;
    align-items: center;
    justify-content: center;
    box-shadow: none;
}

.back-to-top:hover {
    transform: translateY(-2px);
    background-color: transparent;
}

.back-to-top i {
    transition: transform 0.3s ease;
}

.back-to-top:hover i {
    transform: scale(2);
}

.back-to-top.show {
    display: flex;
    animation: fadeInUp 0.3s ease;
}

/* 黑夜模式 - 与笔记 post 页一致 */
:root:not([data-theme="light"]) .back-to-top {
    border-color: #A00A14;
    color: #A00A14;
}

:root:not([data-theme="light"]) .back-to-top:hover {
    border-color: #A00A14;
    color: #A00A14;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}