/* ========== 颜色变量定义（浅色主题，默认） ========== */
:root {
    --bg-body: #ffffff;
    --text-primary: #1a2c3e;
    --text-secondary: #2c4b6e;
    --text-muted: #4b6a8a;
    --text-soft: #3b5a7c;
    --border-light: #eff3f8;
    --border-medium: #e2e8f0;
    --border-card: #eef2f8;
    --hero-bg: linear-gradient(135deg, #f9fcff 0%, #ffffff 100%);
    --stat-bg: #f4f9fe;
    --stat-border: #e6edf6;
    --download-bg: linear-gradient(120deg, #f9fefd, #ffffff);
    --card-bg: white;
    --card-shadow: 0 8px 20px rgba(0, 0, 0, 0.02), 0 2px 6px rgba(0, 0, 0, 0.05);
    --card-hover-border: #dce5f0;
    --card-hover-shadow: 0 24px 36px -12px rgba(0, 0, 0, 0.12);
    --icon-bg: #eef4ff;
    --btn-primary-bg: #1e4f8a;
    --btn-primary-hover: #0f3b66;
    --btn-primary-shadow: rgba(30, 79, 138, 0.4);
    --btn-outline-border: #cbd5e1;
    --btn-outline-hover-bg: #f0f7ff;
    --btn-outline-hover-border: #1e4f8a;
    --btn-secondary-bg: #f8fafc;
    --btn-secondary-border: #e2e8f0;
    --btn-secondary-color: #1e2f3e;
    --btn-secondary-hover-bg: #ffffff;
    --btn-secondary-hover-border: #b9c8e8;
    --success-color: #1e8f6e;
    --gradient-start: #1f3e5c;
    --gradient-end: #1e4f8a;
    --feature-sub-color: #4a627a;
    --feature-desc-color: #3b5a7c;
    --stat-number-color: #1e4f8a;
    --stat-desc-color: #2c5a7a;
    --download-desc-color: #476b8f;
    --download-icon-color: #cbddee;
    --resource-bg: #ffffff;
    --resource-icon-color: #1e4f8a;
    --resource-title-color: #1f3b5c;
    --resource-desc-color: #597c9b;
    --badge-bg: #eef4ff;
    --badge-color: #1e4f8a;
    --scrollbar-track: #f1f1f1;
    --scrollbar-thumb: #cbd5e1;
    --scrollbar-thumb-hover: #94a3b8;
    --nav-link-active-bg: #eef2ff;
    --version-title-color: #1e4f8a;
    --table-header-bg: #f0f6fd;
    --table-header-color: #1e4f8a;
    --table-border: #e2e8f0;
    --table-cell-bg: #ffffff;
    --version-series-border-left: #1e4f8a;
    --sidebar-bg: #ffffff;
    --sidebar-border: #eff3f8;
    --sidebar-header-color: #1e4f8a;
    --sidebar-header-border: #eef2f8;
    --folder-color: #2c3e50;
    --folder-hover-bg: #f0f6fd;
    --folder-arrow-color: #7b9ec0;
    --tree-link-color: #4a627a;
    --tree-link-hover-color: #1e4f8a;
    --tree-link-hover-bg: #f0f6fd;
    --tree-link-active-bg: #eef4ff;
    --doc-section-bg: #ffffff;
    --doc-section-border: #eff3f8;
    --doc-heading-color: #1e3b5c;
    --doc-heading-border-left: #1e4f8a;
    --doc-h3-color: #2c5f8a;
    --nav-bg: rgba(255, 255, 255, 0.92);
    --nav-border: #eef2f8;
    --logo-color: #2c5f8a;
    --nav-link-color: #334155;
    --footer-bg: #fbfdff;
    --footer-text: #4a6d8e;
}

/* ========== 深色主题变量覆盖（添加 .dark 类） ========== */
.dark {
    --bg-body: #0f1724;
    --text-primary: #e2e8f0;
    --text-secondary: #b9d0f0;
    --text-muted: #8ba3c4;
    --text-soft: #9bb5d3;
    --border-light: #1e2a3a;
    --border-medium: #2d3a4b;
    --border-card: #1e2a3a;
    --hero-bg: linear-gradient(135deg, #0b1420 0%, #0f1724 100%);
    --stat-bg: #111827;
    --stat-border: #1f2a3e;
    --download-bg: linear-gradient(120deg, #0e1a24, #0f1724);
    --card-bg: #1a2538;
    --card-shadow: 0 8px 20px rgba(0, 0, 0, 0.3);
    --card-hover-border: #2d3e54;
    --card-hover-shadow: 0 24px 36px -12px rgba(0, 0, 0, 0.5);
    --icon-bg: #1f3a5c;
    --btn-primary-bg: #2c6e9e;
    --btn-primary-hover: #1f5580;
    --btn-primary-shadow: rgba(44, 110, 158, 0.5);
    --btn-outline-border: #4a627a;
    --btn-outline-hover-bg: #1e2f42;
    --btn-outline-hover-border: #5f8bc2;
    --btn-secondary-bg: #1f2e42;
    --btn-secondary-border: #2d3e54;
    --btn-secondary-color: #e2e8f0;
    --btn-secondary-hover-bg: #1a2538;
    --btn-secondary-hover-border: #4a6a8e;
    --success-color: #2d9c7a;
    --gradient-start: #9ac2e6;
    --gradient-end: #6ea8fe;
    --feature-sub-color: #a0bbd9;
    --feature-desc-color: #b0c8e5;
    --stat-number-color: #6ea8fe;
    --stat-desc-color: #a0c2e8;
    --download-desc-color: #9bb9da;
    --download-icon-color: #3b5a7c;
    --resource-bg: #1a2538;
    --resource-icon-color: #7ab3e6;
    --resource-title-color: #d6e6ff;
    --resource-desc-color: #9bb9da;
    --badge-bg: #1e3a5f;
    --badge-color: #b9dcff;
    --scrollbar-track: #1e2a36;
    --scrollbar-thumb: #3b4e66;
    --scrollbar-thumb-hover: #5a6f8c;
    --nav-link-active-bg: #1f3a5c;
    --version-title-color: #b9dcff;
    --table-header-bg: #14202e;
    --table-header-color: #b9dcff;
    --table-border: #2d3e54;
    --table-cell-bg: #111b28;
    --version-series-border-left: #5f8bc2;
    --sidebar-bg: #111b28;
    --sidebar-border: #1f2e42;
    --sidebar-header-color: #b9dcff;
    --sidebar-header-border: #1f2e42;
    --folder-color: #cde3ff;
    --folder-hover-bg: #1f3148;
    --folder-arrow-color: #7b9ec0;
    --tree-link-color: #b0c8e5;
    --tree-link-hover-color: #c6e2ff;
    --tree-link-hover-bg: #1f3148;
    --tree-link-active-bg: #1e3a5f;
    --doc-section-bg: #111b28;
    --doc-section-border: #1f2e42;
    --doc-heading-color: #cde3ff;
    --doc-heading-border-left: #5f8bc2;
    --doc-h3-color: #9ac2e6;
    --nav-bg: rgba(18, 25, 40, 0.92);
    --nav-border: #1e2a3a;
    --logo-color: #7ab3e6;
    --nav-link-color: #cbd5e6;
    --footer-bg: #0f1724;
    --footer-text: #8ba3c4;
}

/* ========== 应用变量到原有样式（只替换颜色相关） ========== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-body);
    color: var(--text-primary);
    line-height: 1.5;
    scroll-behavior: smooth;
}


::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--scrollbar-track);
    border-radius: 10px;
}

::-webkit-scrollbar-thumb {
    background: var(--scrollbar-thumb);
    border-radius: 10px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--scrollbar-thumb-hover);
}

a,
button {
    transition: all 0.2s ease;
}

a {
    text-decoration: none;
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-weight: 600;
    border-radius: 40px;
    padding: 12px 28px;
    font-size: 1rem;
    line-height: 1.25;
    text-decoration: none;
    cursor: pointer;
    border: 1px solid transparent;
    transition: transform 0.2s, box-shadow 0.2s, background 0.2s;
}

.btn-primary {
    background: var(--btn-primary-bg);
    color: white;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.05);
}

.btn-primary:hover {
    background: var(--btn-primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 12px 20px -12px var(--btn-primary-shadow);
}

.btn-outline {
    background: transparent;
    border-color: var(--btn-outline-border);
    color: var(--btn-primary-bg);
}

.btn-outline:hover {
    border-color: var(--btn-outline-hover-border);
    background: var(--btn-outline-hover-bg);
    transform: translateY(-2px);
}

.btn-secondary {
    background: var(--btn-secondary-bg);
    border-color: var(--btn-secondary-border);
    color: var(--btn-secondary-color);
}

.btn-secondary:hover {
    background: var(--btn-secondary-hover-bg);
    border-color: var(--btn-secondary-hover-border);
    box-shadow: 0 6px 12px -8px rgba(0, 0, 0, 0.1);
}

.hero {
    padding: 4rem 0 3rem 0;
    background: var(--hero-bg);
}

.success {
    color: var(--success-color);
}

.page-title {
    font-size: 3.2rem;
    font-weight: 700;
    max-width: 800px;
    letter-spacing: -0.02em;
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    background-clip: text;
    -webkit-background-clip: text;
    color: transparent;
}

.hero .hero-slogan {
    font-size: 3.2rem;
    font-weight: 700;
    max-width: 800px;
    letter-spacing: -0.02em;
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    background-clip: text;
    -webkit-background-clip: text;
    color: transparent;
}

.hero .hero-desc {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 680px;
    margin-top: -0.5rem;
}

.hero .hero-comment {
    display: flex;
    gap: 2rem;
    flex-wrap: wrap;
    justify-content: center;
    margin-top: 1rem;
    font-size: 0.9rem;
    color: var(--text-muted);
}

.feature-title {
    font-size: 2rem;
    font-weight: 600;
    letter-spacing: -0.01em;
}

.feature-sub-title {
    color: var(--feature-sub-color);
    margin-top: 0.5rem;
}

.feature-card {
    background: var(--card-bg);
    border-radius: 28px;
    padding: 1.8rem;
    box-shadow: var(--card-shadow);
    border: 1px solid var(--border-card);
    transition: all 0.3s;
}

.feature-card:hover {
    transform: translateY(-5px);
    border-color: var(--card-hover-border);
    box-shadow: var(--card-hover-shadow);
}

.feature-card .feature-icon-container {
    background: var(--icon-bg);
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 24px;
    margin-bottom: 1.5rem;
}

.feature-card .feature-icon {
    font-size: 1.6rem;
    color: var(--btn-primary-bg);
}

.feature-card .feature-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.feature-card .feature-desc {
    color: var(--feature-desc-color);
}

.stat-card {
    background: var(--stat-bg);
    border-radius: 48px;
    padding: 3rem 2rem;
    text-align: center;
    border: 1px solid var(--stat-border);
}

.stat-card .stat-number {
    font-size: 2.8rem;
    font-weight: 800;
    color: var(--stat-number-color);
}

.stat-card .stat-number .stat-label {
    font-size: 1.2rem;
}

.stat-card .stat-desc {
    color: var(--stat-desc-color);
}

.download-card {
    background: var(--download-bg);
    border-radius: 48px;
    padding: 2rem 2rem;
}

.download-card .download-btn {
    background: linear-gradient(105deg, #1b6b6b, #0f5f77);
}

.download-card .download-icon {
    font-size: 12rem;
    color: var(--download-icon-color);
    opacity: 0.7;
}

.download-card .download-desc {
    color: var(--download-desc-color);
}

.download-card .download-label {
    font-size: 0.8rem;
    margin-top: 0.5rem;
}

.resource-card {
    text-decoration: none;
    background: var(--resource-bg);
    border-radius: 28px;
    border: 1px solid var(--border-card);
    padding: 1.8rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    transition: all 0.2s;
}

.resource-card .resource-icon {
    font-size: 2rem;
    color: var(--resource-icon-color);
}

.resource-card .resource-title {
    font-weight: 600;
    color: var(--resource-title-color);
}

.resource-card .resource-desc {
    color: var(--resource-desc-color);
    font-size: 0.85rem;
}

@keyframes fadeUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.animate-fade-up {
    animation: fadeUp 0.6s cubic-bezier(0.2, 0.9, 0.4, 1.1) forwards;
}

.section {
    opacity: 0;
}

@media (max-width: 768px) {
    .container {
        padding: 0 20px;
    }

    .btn {
        padding: 10px 20px;
        font-size: 0.9rem;
    }

    .feature-card {
        padding: 1.4rem;
    }

    h1 {
        font-size: 2.2rem !important;
        letter-spacing: -0.02em;
    }
}

.nav-links {
    display: flex;
    gap: 2rem;
    align-items: center;
}

@media (max-width: 640px) {
    .nav-links {
        gap: 1.2rem;
        flex-wrap: wrap;
        justify-content: center;
        margin-top: 0.5rem;
    }

    .navbar .container {
        flex-direction: column;
        text-align: center;
    }
}

nav {
    position: sticky;
    top: 0;
    z-index: 50;
    background: var(--nav-bg);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--nav-border);
}

nav .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 1rem;
    padding-bottom: 1rem;
    flex-wrap: wrap;
}

nav .container .logo {
    display: flex;
    align-items: center;
    gap: 8px;
}

nav .container .logo .title-zh {
    font-weight: 700;
    color: var(--logo-color);
    font-size: 1.45rem;
}

nav .container .logo .title-en {
    font-weight: 500;
    color: var(--logo-color);
}

.nav-link {
    text-decoration: none;
    font-weight: 500;
    color: var(--nav-link-color);
}

footer {
    border-top: 1px solid var(--nav-border);
    padding: 2.5rem 0;
    background: var(--footer-bg);
}

footer .footer-item {
    color: var(--footer-text);
}

.nav-link.active {
    background: var(--nav-link-active-bg);
    padding: 6px 14px;
    border-radius: 40px;
}

.badge {
    background: var(--badge-bg);
    color: var(--badge-color);
    border-radius: 100px;
    padding: 4px 12px;
    font-size: 0.8rem;
    font-weight: 500;
    display: inline-block;
}

.screenshot-float {
    transform: translateY(-8px) translateX(4px);
    box-shadow: 20px 20px 30px -10px rgba(0, 0, 0, 0.2), -5px -5px 10px rgba(255, 255, 255, 0.5);
}

.version-history-title {
    font-size: 2rem;
    font-weight: 600;
    color: var(--version-title-color);
    margin: 0 auto;
}

table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.03);
}

table thead tr {
    background: var(--table-header-bg);
}

table th,
table td {
    border: 1px solid var(--table-border);
    padding: 12px 16px;
    vertical-align: top;
    text-align: left;
}

table th {
    font-weight: 600;
    color: var(--table-header-color);
    background-color: var(--table-header-bg);
}

table td {
    background-color: var(--table-cell-bg);
}

ul,
ol {
    margin: 0 0 0 1.2rem;
    padding-left: 0;
}

table li {
    margin-bottom: 6px;
    line-height: 1.45;
}

.version-series-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--version-title-color);
    margin: 2rem 0 1rem;
    padding-left: 0.5rem;
    border-left: 4px solid var(--version-series-border-left);
}

.doc-sidebar {
    width: 280px;
    flex-shrink: 0;
    background: var(--sidebar-bg);
    border-radius: 28px;
    border: 1px solid var(--sidebar-border);
    padding: 1.2rem 0;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.02);
    align-self: start;
    position: sticky;
    top: 100px;
}

.sidebar-header {
    font-weight: 700;
    font-size: 1.1rem;
    padding: 0 1.2rem 0.8rem;
    border-bottom: 1px solid var(--sidebar-header-border);
    margin-bottom: 0.8rem;
    color: var(--sidebar-header-color);
}

.tree,
.tree ul {
    list-style: none;
    margin: 0;
    padding-left: 0;
}

.tree li {
    margin: 0;
    padding: 0;
}

.folder-toggle {
    display: block;
    padding: 0.5rem 1.2rem;
    font-weight: 600;
    color: var(--folder-color);
    cursor: pointer;
    transition: background 0.2s;
    border-radius: 0;
    user-select: none;
}

.folder-toggle:hover {
    background: var(--folder-hover-bg);
}

.tree ul {
    padding-left: 1.8rem;
}

.tree ul li a {
    display: block;
    padding: 0.4rem 1.2rem 0.4rem 1rem;
    color: var(--tree-link-color);
    text-decoration: none;
    font-size: 0.9rem;
    border-radius: 12px;
    transition: all 0.2s;
}

.tree ul li a:hover {
    color: var(--tree-link-hover-color);
    background: var(--tree-link-hover-bg);
}

.folder-toggle::before {
    content: "▶";
    display: inline-block;
    font-size: 0.7rem;
    margin-right: 8px;
    transition: transform 0.2s;
    color: var(--folder-arrow-color);
}

.folder-toggle.open::before {
    transform: rotate(90deg);
}

.doc-content {
    flex: 1;
    min-width: 0;
}

.doc-section {
    background: var(--doc-section-bg);
    border-radius: 28px;
    border: 1px solid var(--doc-section-border);
    padding: 1.8rem;
    margin-bottom: 2rem;
    scroll-margin-top: 80px;
}

.doc-section h1 {
    font-size: 2rem;
    font-weight: 700;
    margin-top: 0;
    margin-bottom: 1rem;
    color: var(--doc-heading-color);
}

.doc-section h2 {
    font-size: 1.6rem;
    font-weight: 600;
    margin-top: 0;
    margin-bottom: 1rem;
    color: var(--doc-heading-color);
    border-left: 4px solid var(--doc-heading-border-left);
    padding-left: 1rem;
}

.doc-section h3 {
    font-size: 1.2rem;
    margin: 1.2rem 0 0.6rem;
    color: var(--doc-h3-color);
}

@media (max-width: 768px) {
    .container {
        flex-direction: column;
    }

    .doc-sidebar {
        width: 100%;
        position: static;
        margin-bottom: 1.5rem;
    }
}

.tree ul li a.active {
    background: var(--tree-link-active-bg);
    color: var(--tree-link-hover-color);
    font-weight: 500;
}

img {
    max-width: 100%;
}

/* 深色模式下，所有 img 变暗一点 */
.dark img {
    filter: brightness(0.6) contrast(1.2);
}