/* ============================================
   Git Codex — 版本控制艺术指南
   设计语言：暖色艺术 · 杂志排版 · 自适应阅读
   ============================================ */

/* ===== 主题变量 ===== */
:root {
    /* 暗色主题（默认） */
    --bg-base: #0b0a14;
    --bg-deep: #07060e;
    --surface: rgba(24, 22, 38, 0.55);
    --surface-solid: #16142a;
    --surface-hover: rgba(30, 28, 48, 0.7);
    --border: rgba(255, 255, 255, 0.06);
    --border-hover: rgba(245, 166, 35, 0.3);
    --text-primary: #e8e6f0;
    --text-secondary: #a09eb0;
    --text-muted: #5a5868;
    /* 艺术配色 */
    --amber: #f5a623;
    --amber-light: #ffc857;
    --coral: #ff6b8a;
    --teal: #4ecca3;
    --lavender: #a8a4ff;
    --gold-grad: linear-gradient(135deg, #f5a623, #ff8c42);
    --coral-grad: linear-gradient(135deg, #ff6b8a, #ff8c42);
    --teal-grad: linear-gradient(135deg, #4ecca3, #38a8d4);
    --lavender-grad: linear-gradient(135deg, #a8a4ff, #c4a5ff);
    --code-bg: rgba(8, 6, 16, 0.6);
    --glow-amber: 0 0 24px rgba(245, 166, 35, 0.15);
    --glow-coral: 0 0 24px rgba(255, 107, 138, 0.15);
    --radius: 14px;
    --radius-sm: 8px;
    --radius-lg: 20px;
    --sidebar-w: 72px;
    --transition: 0.35s cubic-bezier(0.22, 1, 0.36, 1);
    --font-base: 16px;
    --font-size: var(--font-base);
}

/* 亮色主题 */
[data-theme="light"] {
    --bg-base: #f5f2ea;
    --bg-deep: #ede9de;
    --surface: rgba(255, 255, 255, 0.65);
    --surface-solid: #ffffff;
    --surface-hover: rgba(255, 255, 255, 0.9);
    --border: rgba(40, 30, 60, 0.08);
    --border-hover: rgba(245, 166, 35, 0.4);
    --text-primary: #2a2538;
    --text-secondary: #5a556a;
    --text-muted: #9a9588;
    --code-bg: rgba(245, 242, 234, 0.8);
    --glow-amber: 0 0 24px rgba(245, 166, 35, 0.1);
    --glow-coral: 0 0 24px rgba(255, 107, 138, 0.1);
}

/* 字号档位 */
[data-fontsize="compact"] { --font-size: 14px; }
[data-fontsize="normal"]  { --font-size: 16px; }
[data-fontsize="large"]   { --font-size: 18px; }

/* ===== 重置 ===== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; font-size: var(--font-size); }

body {
    font-family: 'Noto Sans SC', sans-serif;
    background: var(--bg-base);
    color: var(--text-primary);
    overflow-x: hidden;
    line-height: 1.7;
    transition: background 0.5s ease, color 0.5s ease;
}

/* ===== Three.js 画布 ===== */
#bg-canvas {
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    z-index: 0;
    pointer-events: none;
    opacity: 0.7;
}

/* ===== 滚动进度条 ===== */
.progress-bar {
    position: fixed;
    top: 0; left: 0;
    width: 100%;
    height: 2px;
    background: transparent;
    z-index: 1000;
}
.progress-fill {
    height: 100%;
    width: 0%;
    background: var(--gold-grad);
    box-shadow: 0 0 8px var(--amber);
    transition: width 0.1s linear;
}

/* ===== 左侧导航轨道 ===== */
.sidebar {
    position: fixed;
    top: 0; left: 0;
    width: var(--sidebar-w);
    height: 100vh;
    background: var(--bg-deep);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 20px 0;
    z-index: 200;
    transition: transform 0.4s ease;
}
.sidebar-logo {
    font-size: 1.8rem;
    color: var(--amber);
    margin-bottom: 32px;
    text-shadow: var(--glow-amber);
    font-weight: 700;
}
.rail-nav {
    display: flex;
    flex-direction: column;
    gap: 12px;
    flex: 1;
}
.rail-item, .rail-tool {
    width: 48px; height: 48px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2px;
    border: 1px solid transparent;
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--text-muted);
    cursor: pointer;
    transition: var(--transition);
    font-family: inherit;
}
.rail-item:hover, .rail-tool:hover {
    background: var(--surface-hover);
    color: var(--text-primary);
}
.rail-item.active {
    background: var(--surface);
    border-color: var(--border-hover);
    color: var(--amber);
    box-shadow: var(--glow-amber);
}
.rail-icon { font-size: 1.1rem; line-height: 1; }
.rail-label { font-size: 0.65rem; letter-spacing: 1px; }
.sidebar-footer { display: flex; flex-direction: column; gap: 8px; }

/* 移动端菜单 */
.menu-toggle {
    display: none;
    position: fixed;
    top: 16px; left: 16px;
    z-index: 300;
    width: 40px; height: 40px;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
    background: var(--surface);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    cursor: pointer;
}
.menu-toggle span {
    width: 18px; height: 2px;
    background: var(--text-primary);
    border-radius: 1px;
    transition: var(--transition);
}

/* ===== 主内容区 ===== */
.main-wrap {
    margin-left: var(--sidebar-w);
    position: relative;
    z-index: 1;
    min-height: 100vh;
}

/* ===== 顶部搜索栏 ===== */
.topbar {
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    background: rgba(11, 10, 20, 0.6);
    border-bottom: 1px solid var(--border);
}
[data-theme="light"] .topbar { background: rgba(245, 242, 234, 0.7); }
.topbar-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 32px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
}
.breadcrumb {
    font-family: 'Noto Serif SC', serif;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-secondary);
}
.crumb-active { color: var(--amber); }

.search-box {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 0 14px;
    height: 36px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    transition: var(--transition);
}
.search-box:focus-within {
    border-color: var(--amber);
    box-shadow: 0 0 0 3px rgba(245, 166, 35, 0.1);
}
.search-icon { color: var(--text-muted); flex-shrink: 0; }
#searchInput {
    background: transparent;
    border: none; outline: none;
    color: var(--text-primary);
    font-size: 0.875rem;
    font-family: inherit;
    width: 180px;
}
#searchInput::placeholder { color: var(--text-muted); }
/* 触屏设备输入框字号 ≥16px，防止 iOS Safari 聚焦时自动放大页面 */
@media (pointer: coarse) {
    #searchInput { font-size: 16px; }
    .terminal-input { font-size: 16px; }
}
.search-kbd {
    padding: 2px 6px;
    background: var(--border);
    border-radius: 4px;
    font-size: 0.7rem;
    color: var(--text-muted);
    font-family: 'JetBrains Mono', monospace;
}

/* ===== Hero ===== */
.hero {
    position: relative;
    min-height: 92vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 80px 32px 60px;
    overflow: hidden;
}
.hero-bg-overlay {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background-image: url('../assets/hero-bg.jpg');
    background-size: cover;
    background-position: center;
    opacity: 0.25;
    mask-image: linear-gradient(to bottom, transparent, rgba(0,0,0,0.6) 30%, rgba(0,0,0,0.6) 70%, transparent);
    -webkit-mask-image: linear-gradient(to bottom, transparent, rgba(0,0,0,0.6) 30%, rgba(0,0,0,0.6) 70%, transparent);
}
[data-theme="light"] .hero-bg-overlay { opacity: 0.15; }
.hero-content {
    position: relative;
    z-index: 2;
    max-width: 720px;
}
.hero-eyebrow {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.75rem;
    letter-spacing: 4px;
    color: var(--amber);
    margin-bottom: 20px;
    text-transform: uppercase;
}
.hero-title {
    font-family: 'Noto Serif SC', serif;
    font-size: clamp(3rem, 8vw, 5.5rem);
    font-weight: 700;
    line-height: 1;
    margin-bottom: 24px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0;
}
.title-line {
    background: var(--gold-grad);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.title-italic {
    font-style: italic;
    font-weight: 400;
    background: var(--coral-grad);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.hero-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 40px;
    line-height: 1.8;
    max-width: 560px;
    margin-left: auto;
    margin-right: auto;
}
.hero-meta {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 24px;
    margin-bottom: 40px;
}
.meta-item { display: flex; flex-direction: column; align-items: center; gap: 2px; }
.meta-num {
    font-family: 'JetBrains Mono', monospace;
    font-size: 2rem;
    font-weight: 700;
    color: var(--amber);
}
.meta-label { font-size: 0.75rem; color: var(--text-muted); }
.meta-dot { width: 4px; height: 4px; border-radius: 50%; background: var(--text-muted); }

.hero-actions { display: flex; gap: 16px; justify-content: center; }
.btn-primary {
    padding: 12px 32px;
    background: var(--gold-grad);
    border: none;
    border-radius: var(--radius-sm);
    color: #1a1208;
    font-size: 0.95rem;
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--glow-amber);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 4px 32px rgba(245, 166, 35, 0.3); }
.btn-ghost {
    padding: 12px 32px;
    background: transparent;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: 0.95rem;
    font-family: inherit;
    cursor: pointer;
    transition: var(--transition);
}
.btn-ghost:hover { border-color: var(--coral); color: var(--coral); }

.hero-scroll-hint {
    position: absolute;
    bottom: 32px; left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: var(--text-muted);
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.7rem;
    letter-spacing: 2px;
}
.scroll-line {
    width: 1px; height: 40px;
    background: linear-gradient(to bottom, transparent, var(--amber));
    animation: scrollPulse 2s ease infinite;
}
@keyframes scrollPulse {
    0%, 100% { opacity: 0.3; transform: scaleY(0.6); }
    50% { opacity: 1; transform: scaleY(1); }
}

/* ===== 内容区域 ===== */
.content-area {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 32px 120px;
}

/* 分类标题 */
.cat-header {
    margin-bottom: 48px;
    padding-top: 60px;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s, transform 0.6s;
}
.cat-header.revealed { opacity: 1; transform: translateY(0); }
.cat-eyebrow {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.75rem;
    letter-spacing: 3px;
    color: var(--amber);
    margin-bottom: 8px;
    text-transform: uppercase;
}
.cat-title {
    font-family: 'Noto Serif SC', serif;
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 12px;
}
.cat-title .accent { color: var(--coral); font-style: italic; }
.cat-desc {
    font-size: 1.05rem;
    color: var(--text-secondary);
    max-width: 600px;
}
.cat-divider {
    width: 60px; height: 3px;
    background: var(--gold-grad);
    border-radius: 2px;
    margin-top: 20px;
}

/* ===== 杂志式卡片网格 ===== */
.mosaic-grid {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    gap: 20px;
    /* 性能隔离 */
    contain: layout style;
}

/* 卡片基础 */
.cmd-card {
    background: var(--surface);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 28px;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    opacity: 0;
    transform: translateY(24px);
    /* GPU 加速 */
    backface-visibility: hidden;
}
.cmd-card.revealed {
    opacity: 1;
    transform: translateY(0);
    /* 离屏内容跳过渲染 */
    content-visibility: auto;
    contain-intrinsic-size: 200px;
}
.cmd-card:hover {
    border-color: var(--border-hover);
    background: var(--surface-hover);
    transform: translateY(-3px);
}
/* 卡片左侧色条 */
.cmd-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0;
    width: 3px; height: 100%;
    background: var(--gold-grad);
    opacity: 0;
    transition: opacity 0.3s;
}
.cmd-card:hover::before { opacity: 1; }

/* 网格跨度 — 杂志式不规则布局 */
.card-span-6 { grid-column: span 6; }
.card-span-8 { grid-column: span 8; }
.card-span-4 { grid-column: span 4; }
.card-span-12 { grid-column: span 12; }

/* 卡片头 */
.card-head {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
}
.card-num {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.75rem;
    color: var(--text-muted);
    letter-spacing: 1px;
}
.card-title {
    font-family: 'Noto Serif SC', serif;
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    flex: 1;
}
.card-tag {
    padding: 3px 10px;
    border-radius: 20px;
    font-size: 0.7rem;
    font-family: 'JetBrains Mono', monospace;
    letter-spacing: 0.5px;
}
.tag-cmd { background: rgba(245, 166, 35, 0.12); color: var(--amber); }
.tag-tip { background: rgba(78, 204, 163, 0.12); color: var(--teal); }
.tag-warn { background: rgba(255, 107, 138, 0.12); color: var(--coral); }

/* 代码块 */
.code-block {
    background: var(--code-bg);
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    overflow: hidden;
    position: relative;
}
.code-block pre {
    padding: 18px 20px;
    overflow-x: auto;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.82rem;
    line-height: 1.75;
}
.code-block pre code { white-space: pre; }
.syn-cmd { color: var(--amber); }
.syn-flag { color: var(--lavender); }
.syn-str { color: var(--teal); }
.syn-cmt { color: var(--text-muted); font-style: italic; }
.syn-warn { color: var(--coral); }

/* 复制按钮 */
.copy-btn {
    position: absolute;
    top: 8px; right: 8px;
    padding: 4px 12px;
    background: var(--surface-hover);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text-muted);
    font-size: 0.7rem;
    font-family: inherit;
    cursor: pointer;
    transition: var(--transition);
    opacity: 0;
}
.code-block:hover .copy-btn { opacity: 1; }
.copy-btn:hover { border-color: var(--amber); color: var(--amber); }
.copy-btn.copied { border-color: var(--teal); color: var(--teal); }

/* 卡片注释 */
.card-note {
    margin-top: 16px;
    padding: 14px 16px;
    background: rgba(245, 166, 35, 0.04);
    border-left: 2px solid var(--amber);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.6;
}
.card-note.warn { background: rgba(255, 107, 138, 0.04); border-left-color: var(--coral); }
.card-note.danger { background: rgba(255, 107, 138, 0.06); border-left-color: var(--coral); }

/* 数据表格 */
.data-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 8px;
}
.data-table th {
    text-align: left;
    padding: 10px 16px;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--amber);
    border-bottom: 1px solid var(--border);
    text-transform: uppercase;
    letter-spacing: 1.5px;
}
.data-table td {
    padding: 12px 16px;
    font-size: 0.875rem;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border);
}
.data-table tr:last-child td { border-bottom: none; }
.data-table tr:hover td { background: rgba(245, 166, 35, 0.03); }

/* 提示框 */
.tip-box {
    padding: 18px 22px;
    background: linear-gradient(135deg, rgba(245, 166, 35, 0.05), rgba(255, 107, 138, 0.05));
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* 无结果 */
.no-results {
    grid-column: span 12;
    text-align: center;
    padding: 80px;
    color: var(--text-muted);
}

/* ===== 返回顶部 ===== */
.back-top {
    position: fixed;
    bottom: 32px; right: 32px;
    width: 44px; height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--surface);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border);
    border-radius: 50%;
    color: var(--amber);
    cursor: pointer;
    transition: var(--transition);
    opacity: 0;
    pointer-events: none;
    z-index: 90;
}
.back-top.visible { opacity: 1; pointer-events: auto; }
.back-top:hover { border-color: var(--amber); box-shadow: var(--glow-amber); transform: translateY(-3px); }

/* ===== 页脚 ===== */
.footer {
    text-align: center;
    padding: 60px 32px 40px;
    position: relative;
}
.footer-line {
    width: 80px; height: 1px;
    background: var(--border);
    margin: 0 auto 24px;
}
.footer-text {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 8px;
}
.footer-text code { font-family: 'JetBrains Mono', monospace; color: var(--amber); }
.footer-sub {
    color: var(--text-muted);
    font-size: 0.8rem;
    font-family: 'Noto Serif SC', serif;
    font-style: italic;
}

/* ===== Toast ===== */
.toast {
    position: fixed;
    bottom: 40px; left: 50%;
    transform: translateX(-50%) translateY(100px);
    padding: 12px 24px;
    background: var(--surface-solid);
    border: 1px solid var(--teal);
    border-radius: var(--radius-sm);
    color: var(--teal);
    font-size: 0.875rem;
    backdrop-filter: blur(12px);
    z-index: 500;
    opacity: 0;
    transition: var(--transition);
    pointer-events: none;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ===== 滚动条 ===== */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--bg-deep); }
::-webkit-scrollbar-thumb { background: rgba(245, 166, 35, 0.2); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: rgba(245, 166, 35, 0.4); }

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
    .card-span-8, .card-span-6 { grid-column: span 6; }
    .card-span-4 { grid-column: span 6; }
}
@media (max-width: 768px) {
    .sidebar { transform: translateX(-100%); }
    .sidebar.open { transform: translateX(0); }
    .main-wrap { margin-left: 0; }
    .menu-toggle { display: flex; }
    .mosaic-grid { grid-template-columns: 1fr; gap: 16px; }
    .card-span-6, .card-span-8, .card-span-4, .card-span-12 { grid-column: span 1; }
    .topbar-inner { padding: 0 20px; }
    #searchInput { width: 120px; }
    .hero-meta { gap: 16px; }
    .meta-num { font-size: 1.5rem; }
}
@media (max-width: 480px) {
    .hero-actions { flex-direction: column; }
    .search-kbd { display: none; }
    #searchInput { width: 100px; }
}

/* ============================================
   实战检测页面样式
   ============================================ */

/* 实战模式容器 */
.practical-mode {
    padding: 24px 32px 80px;
    max-width: 1400px;
    margin: 0 auto;
}

/* 实战 Hero */
.practical-hero {
    position: relative;
    min-height: 38vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 60px 32px 40px;
    overflow: hidden;
    border-bottom: 1px solid var(--border);
}
.practical-hero-bg {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background-image: url('../assets/practical-bg.jpg');
    background-size: cover;
    background-position: center;
    opacity: 0.2;
    mask-image: linear-gradient(to bottom, rgba(0,0,0,0.6), transparent);
    -webkit-mask-image: linear-gradient(to bottom, rgba(0,0,0,0.6), transparent);
}
[data-theme="light"] .practical-hero-bg { opacity: 0.12; }
.practical-hero-content {
    position: relative;
    z-index: 2;
    max-width: 720px;
}
.practical-hero-eyebrow {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.75rem;
    letter-spacing: 4px;
    color: var(--teal);
    margin-bottom: 16px;
    text-transform: uppercase;
}
.practical-hero-title {
    font-family: 'Noto Serif SC', serif;
    font-size: clamp(2.2rem, 5vw, 3.5rem);
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 16px;
}
.practical-hero-title .accent {
    background: var(--teal-grad);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-style: italic;
}
.practical-hero-subtitle {
    font-size: 1rem;
    color: var(--text-secondary);
    max-width: 560px;
    margin: 0 auto;
    line-height: 1.8;
}

/* 布局 */
.practical-layout {
    display: grid;
    grid-template-columns: 320px 1fr;
    gap: 24px;
    padding: 32px 0;
    align-items: start;
}

/* 左侧场景面板 */
.scenario-panel {
    background: var(--surface);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    position: sticky;
    top: 72px;
    max-height: calc(100vh - 90px);
    overflow-y: auto;
}
.scenario-panel-head { margin-bottom: 20px; }
.panel-title {
    font-family: 'Noto Serif SC', serif;
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
}
.panel-sub {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* 场景列表 */
.scenario-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 20px;
}
.scenario-item {
    padding: 16px;
    background: transparent;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
    position: relative;
}
.scenario-item:hover {
    border-color: var(--border-hover);
    background: var(--surface-hover);
    transform: translateX(2px);
}
.scenario-item:focus-visible {
    outline: 2px solid var(--teal);
    outline-offset: 2px;
}
.scenario-item.active {
    border-color: var(--teal);
    background: rgba(78, 204, 163, 0.06);
    box-shadow: 0 0 16px rgba(78, 204, 163, 0.1);
}
.scenario-item.completed::after {
    content: '';
    position: absolute;
    top: 0; left: 0;
    width: 3px; height: 100%;
    background: var(--teal-grad);
    border-radius: var(--radius-sm) 0 0 var(--radius-sm);
}
.scenario-item-head {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 8px;
}
.scenario-icon {
    font-size: 1.4rem;
    color: var(--amber);
    line-height: 1;
    width: 32px;
    text-align: center;
}
.scenario-item.active .scenario-icon { color: var(--teal); }
.scenario-info { flex: 1; }
.scenario-name {
    font-family: 'Noto Serif SC', serif;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1.3;
}
.scenario-chapter {
    font-size: 0.7rem;
    color: var(--text-muted);
    font-family: 'JetBrains Mono', monospace;
    letter-spacing: 1px;
}
.scenario-check {
    color: var(--teal);
    font-size: 1.1rem;
    font-weight: 700;
}
.scenario-desc {
    font-size: 0.82rem;
    color: var(--text-secondary);
    line-height: 1.5;
    margin-bottom: 10px;
}
.scenario-meta {
    display: flex;
    align-items: center;
    gap: 8px;
}
.diff-label {
    font-size: 0.7rem;
    color: var(--text-muted);
    font-family: 'JetBrains Mono', monospace;
}
.diff-dot {
    width: 6px; height: 6px;
    border-radius: 50%;
    background: var(--border);
}
.diff-dot.active {
    background: var(--amber);
}
.task-count {
    margin-left: auto;
    font-size: 0.7rem;
    color: var(--text-muted);
    font-family: 'JetBrains Mono', monospace;
}

/* 进度 */
.scenario-progress {
    padding-top: 16px;
    border-top: 1px solid var(--border);
}
.progress-info {
    display: flex;
    justify-content: space-between;
    margin-bottom: 8px;
}
.progress-label {
    font-size: 0.8rem;
    color: var(--text-secondary);
}
.progress-count {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.8rem;
    color: var(--teal);
    font-weight: 600;
}
.progress-track {
    height: 6px;
    background: var(--border);
    border-radius: 3px;
    overflow: hidden;
}
.progress-bar-fill {
    height: 100%;
    background: var(--teal-grad);
    border-radius: 3px;
    transition: width 0.5s ease;
}

/* 右侧终端面板 */
.terminal-panel {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

/* 任务条 */
.task-bar {
    background: var(--surface);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    transition: var(--transition);
}
.task-bar.all-done {
    border-color: var(--teal);
    box-shadow: 0 0 20px rgba(78, 204, 163, 0.15);
}
.task-bar-content { padding: 0; }
.task-progress-bar {
    height: 3px;
    background: var(--border);
}
.task-progress-fill {
    height: 100%;
    background: var(--gold-grad);
    transition: width 0.5s ease;
}
.task-current { padding: 18px 24px; }
.task-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 8px;
}
.task-step {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.75rem;
    color: var(--amber);
    letter-spacing: 1px;
}
.task-hint-btn {
    padding: 3px 12px;
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text-muted);
    font-size: 0.72rem;
    font-family: inherit;
    cursor: pointer;
    transition: var(--transition);
}
.task-hint-btn:hover {
    border-color: var(--amber);
    color: var(--amber);
}
.hint-kbd {
    display: inline-block;
    min-width: 15px;
    padding: 0 4px;
    margin-right: 6px;
    border: 1px solid var(--border);
    border-radius: 4px;
    background: rgba(255, 255, 255, 0.04);
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.68rem;
    line-height: 1.5;
    text-align: center;
    color: var(--text-muted);
    transition: var(--transition);
}
.task-hint-btn:hover .hint-kbd {
    border-color: var(--amber);
    color: var(--amber);
}
.task-instruction {
    font-size: 0.95rem;
    color: var(--text-primary);
    line-height: 1.6;
    font-weight: 500;
}
.task-hint {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: 10px;
    padding: 8px 12px;
    background: rgba(245, 166, 35, 0.06);
    border-radius: var(--radius-sm);
}
.hint-icon { font-size: 0.9rem; }
.hint-code {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.82rem;
    color: var(--amber);
}

/* 任务占位 */
.task-placeholder {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 24px;
    color: var(--text-muted);
    font-size: 0.9rem;
}
.task-placeholder-icon {
    color: var(--amber);
    font-size: 1rem;
}

/* 任务完成 */
.task-complete {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 24px;
}
.complete-icon {
    font-size: 2rem;
    color: var(--teal);
    line-height: 1;
}
.complete-title {
    font-family: 'Noto Serif SC', serif;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--teal);
    margin-bottom: 4px;
}
.complete-msg {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* 终端 */
.terminal {
    background: rgba(8, 6, 16, 0.92);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}
[data-theme="light"] .terminal {
    background: rgba(30, 28, 40, 0.95);
}
.terminal-header {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 16px;
    background: rgba(255, 255, 255, 0.03);
    border-bottom: 1px solid var(--border);
}
.terminal-dots {
    display: flex;
    gap: 6px;
}
.dot {
    width: 12px; height: 12px;
    border-radius: 50%;
}
.dot-red { background: #ff5f56; }
.dot-yellow { background: #ffbd2e; }
.dot-green { background: #27c93f; }
.terminal-title {
    flex: 1;
    text-align: center;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.75rem;
    color: var(--text-muted);
}
.terminal-badge {
    padding: 2px 8px;
    background: rgba(78, 204, 163, 0.15);
    border: 1px solid rgba(78, 204, 163, 0.3);
    border-radius: 4px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.65rem;
    color: var(--teal);
    letter-spacing: 1px;
}

/* 终端主体 */
.terminal-body {
    height: 420px;
    overflow-y: auto;
    padding: 16px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.82rem;
    line-height: 1.7;
    cursor: text;
}
.terminal-body::-webkit-scrollbar { width: 6px; }
.terminal-body::-webkit-scrollbar-track { background: transparent; }
.terminal-body::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.1); border-radius: 3px; }

/* 终端输出行 */
.term-line { margin-bottom: 2px; word-break: break-all; }
.term-welcome { margin-bottom: 16px; }
.welcome-line {
    color: var(--teal);
    font-size: 0.75rem;
    white-space: pre;
}
.welcome-text {
    color: var(--text-secondary);
    font-size: 0.8rem;
    margin-top: 4px;
}
.welcome-text.muted { color: var(--text-muted); }
.term-cmd {
    color: var(--amber);
    background: rgba(245, 166, 35, 0.1);
    padding: 1px 6px;
    border-radius: 3px;
}

/* 命令行 */
.term-line.term-command {
    margin-top: 12px;
}
.term-prompt {
    color: var(--teal);
    font-weight: 700;
    margin-right: 6px;
}
.term-cmd-text {
    color: var(--text-primary);
}

/* 输出 */
.term-out { color: #c8c6d8; }
.term-err { color: var(--coral); }
.term-ok { color: var(--teal); font-weight: 500; }
.term-sys { color: var(--lavender); }
.term-story { color: var(--text-secondary); font-style: italic; }

/* 输入行 */
.terminal-input-line {
    display: flex;
    align-items: center;
    padding: 0 16px 16px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.82rem;
}
.terminal-prompt-text {
    color: var(--teal);
    font-weight: 700;
}
.terminal-prompt-sep { color: var(--text-muted); margin: 0 2px; }
.terminal-prompt-path {
    color: var(--lavender);
}
.terminal-prompt-symbol {
    color: var(--text-muted);
    margin: 0 8px 0 6px;
}
.terminal-input {
    flex: 1;
    background: transparent;
    border: none;
    outline: none;
    color: var(--text-primary);
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.82rem;
    caret-color: var(--amber);
}
.terminal-input::placeholder {
    color: rgba(255, 255, 255, 0.15);
}

/* 仓库可视化 */
.repo-visualizer {
    background: var(--surface);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px 24px;
}
.viz-section {}
.viz-title {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.7rem;
    color: var(--text-muted);
    letter-spacing: 2px;
    text-transform: uppercase;
    margin-bottom: 14px;
}
.viz-content {}
.viz-empty {
    color: var(--text-muted);
    font-size: 0.85rem;
}
.viz-row {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
    flex-wrap: wrap;
}
.viz-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    min-width: 60px;
    font-family: 'JetBrains Mono', monospace;
}
.viz-value {
    font-size: 0.85rem;
    color: var(--text-primary);
    font-weight: 500;
}
.viz-value.has-items { color: var(--amber); }
.viz-sub {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-style: italic;
}
.viz-branches {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
}
.viz-branch {
    padding: 2px 10px;
    background: var(--border);
    border-radius: 4px;
    font-size: 0.72rem;
    font-family: 'JetBrains Mono', monospace;
    color: var(--text-secondary);
}
.viz-branch.current {
    background: rgba(78, 204, 163, 0.15);
    color: var(--teal);
    border: 1px solid rgba(78, 204, 163, 0.3);
}
.viz-files-section {
    margin-top: 8px;
}
.viz-files {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 6px;
    margin-top: 8px;
}
.viz-file {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 6px 10px;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 0.75rem;
}
[data-theme="light"] .viz-file {
    background: rgba(0, 0, 0, 0.02);
}
.viz-file-name {
    color: var(--text-primary);
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.72rem;
}
.viz-file-status {
    font-size: 0.62rem;
    font-family: 'JetBrains Mono', monospace;
    padding: 1px 6px;
    border-radius: 3px;
    letter-spacing: 0.5px;
}
.status-staged { background: rgba(245, 166, 35, 0.15); color: var(--amber); }
.status-modified { background: rgba(255, 107, 138, 0.15); color: var(--coral); }
.status-untracked { background: rgba(168, 164, 255, 0.15); color: var(--lavender); }
.status-committed { background: rgba(78, 204, 163, 0.1); color: var(--teal); }

/* 响应式 */
@media (max-width: 1024px) {
    .practical-layout {
        grid-template-columns: 1fr;
    }
    .scenario-panel {
        position: static;
        max-height: none;
    }
}
@media (max-width: 768px) {
    .practical-mode { padding: 16px 20px 60px; }
    .terminal-body { height: 320px; font-size: 0.75rem; }
    .viz-files { grid-template-columns: 1fr; }
    .scenario-panel { padding: 16px; }
}

/* ============================================
   GitHub 主题样式 & 增强视觉效果
   ============================================ */

/* ===== 导航分隔线 ===== */
.rail-divider {
    width: 32px;
    height: 1px;
    background: var(--border);
    margin: 4px auto;
}

/* ===== GitHub 主题色 ===== */
:root {
    --gh-purple: #8b5cf6;
    --gh-blue: #3b82f6;
    --gh-cyan: #06b6d4;
    --gh-purple-grad: linear-gradient(135deg, #8b5cf6, #6366f1);
    --gh-blue-grad: linear-gradient(135deg, #3b82f6, #06b6d4);
    --gh-cyan-grad: linear-gradient(135deg, #06b6d4, #4ecca3);
    --glow-gh-purple: 0 0 24px rgba(139, 92, 246, 0.15);
    --glow-gh-blue: 0 0 24px rgba(59, 130, 246, 0.15);
    --glow-gh-cyan: 0 0 24px rgba(6, 182, 212, 0.15);
}

/* GitHub 标签页激活态配色 */
.rail-item[data-tab="github-basic"].active {
    border-color: rgba(139, 92, 246, 0.3);
    color: var(--gh-purple);
    box-shadow: var(--glow-gh-purple);
}
.rail-item[data-tab="github-advanced"].active {
    border-color: rgba(59, 130, 246, 0.3);
    color: var(--gh-blue);
    box-shadow: var(--glow-gh-blue);
}
.rail-item[data-tab="github-workflow"].active {
    border-color: rgba(6, 182, 212, 0.3);
    color: var(--gh-cyan);
    box-shadow: var(--glow-gh-cyan);
}

/* ===== GitHub 分类标题渐变 ===== */
.category-wrapper[data-category="github-basic"] .cat-eyebrow { color: var(--gh-purple); }
.category-wrapper[data-category="github-basic"] .cat-divider { background: var(--gh-purple-grad); }
.category-wrapper[data-category="github-basic"] .cat-title .accent { color: var(--gh-purple); }

.category-wrapper[data-category="github-advanced"] .cat-eyebrow { color: var(--gh-blue); }
.category-wrapper[data-category="github-advanced"] .cat-divider { background: var(--gh-blue-grad); }
.category-wrapper[data-category="github-advanced"] .cat-title .accent { color: var(--gh-blue); }

.category-wrapper[data-category="github-workflow"] .cat-eyebrow { color: var(--gh-cyan); }
.category-wrapper[data-category="github-workflow"] .cat-divider { background: var(--gh-cyan-grad); }
.category-wrapper[data-category="github-workflow"] .cat-title .accent { color: var(--gh-cyan); }

/* ===== GitHub 卡片色条变体 ===== */
.category-wrapper[data-category="github-basic"] .cmd-card::before { background: var(--gh-purple-grad); }
.category-wrapper[data-category="github-advanced"] .cmd-card::before { background: var(--gh-blue-grad); }
.category-wrapper[data-category="github-workflow"] .cmd-card::before { background: var(--gh-cyan-grad); }

/* GitHub 卡片 hover 发光 */
.category-wrapper[data-category="github-basic"] .cmd-card:hover {
    border-color: rgba(139, 92, 246, 0.3);
    box-shadow: 0 4px 32px rgba(139, 92, 246, 0.08);
}
.category-wrapper[data-category="github-advanced"] .cmd-card:hover {
    border-color: rgba(59, 130, 246, 0.3);
    box-shadow: 0 4px 32px rgba(59, 130, 246, 0.08);
}
.category-wrapper[data-category="github-workflow"] .cmd-card:hover {
    border-color: rgba(6, 182, 212, 0.3);
    box-shadow: 0 4px 32px rgba(6, 182, 212, 0.08);
}

/* GitHub 表格表头配色 */
.category-wrapper[data-category="github-basic"] .data-table th { color: var(--gh-purple); }
.category-wrapper[data-category="github-advanced"] .data-table th { color: var(--gh-blue); }
.category-wrapper[data-category="github-workflow"] .data-table th { color: var(--gh-cyan); }

/* GitHub 表格行 hover */
.category-wrapper[data-category="github-basic"] .data-table tr:hover td { background: rgba(139, 92, 246, 0.03); }
.category-wrapper[data-category="github-advanced"] .data-table tr:hover td { background: rgba(59, 130, 246, 0.03); }
.category-wrapper[data-category="github-workflow"] .data-table tr:hover td { background: rgba(6, 182, 212, 0.03); }

/* GitHub 卡片标签配色 */
.category-wrapper[data-category="github-basic"] .tag-cmd { background: rgba(139, 92, 246, 0.12); color: var(--gh-purple); }
.category-wrapper[data-category="github-advanced"] .tag-cmd { background: rgba(59, 130, 246, 0.12); color: var(--gh-blue); }
.category-wrapper[data-category="github-workflow"] .tag-cmd { background: rgba(6, 182, 212, 0.12); color: var(--gh-cyan); }

/* GitHub 卡片注释配色 */
.category-wrapper[data-category="github-basic"] .card-note { background: rgba(139, 92, 246, 0.04); border-left-color: var(--gh-purple); }
.category-wrapper[data-category="github-advanced"] .card-note { background: rgba(59, 130, 246, 0.04); border-left-color: var(--gh-blue); }
.category-wrapper[data-category="github-workflow"] .card-note { background: rgba(6, 182, 212, 0.04); border-left-color: var(--gh-cyan); }

/* GitHub 提示框配色 */
.category-wrapper[data-category="github-basic"] .tip-box {
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.05), rgba(99, 102, 241, 0.05));
}
.category-wrapper[data-category="github-advanced"] .tip-box {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.05), rgba(6, 182, 212, 0.05));
}
.category-wrapper[data-category="github-workflow"] .tip-box {
    background: linear-gradient(135deg, rgba(6, 182, 212, 0.05), rgba(78, 204, 163, 0.05));
}

/* GitHub 代码块高亮配色 */
.category-wrapper[data-category="github-basic"] .syn-cmd { color: var(--gh-purple); }
.category-wrapper[data-category="github-advanced"] .syn-cmd { color: var(--gh-blue); }
.category-wrapper[data-category="github-workflow"] .syn-cmd { color: var(--gh-cyan); }

/* ===== 卡片顶部流光动画 ===== */
.cmd-card::after {
    content: '';
    position: absolute;
    top: 0; left: -100%;
    width: 100%; height: 1px;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.1), transparent);
    transition: left 0.6s ease;
}
.cmd-card:hover::after {
    left: 100%;
}

/* ===== GitHub 主题卡片入场动画增强 ===== */
.category-wrapper[data-category="github-basic"] .cmd-card.revealed,
.category-wrapper[data-category="github-advanced"] .cmd-card.revealed,
.category-wrapper[data-category="github-workflow"] .cmd-card.revealed {
    animation: ghCardSlideIn 0.5s cubic-bezier(0.22, 1, 0.36, 1);
}

@keyframes ghCardSlideIn {
    from {
        opacity: 0;
        transform: translateY(24px) scale(0.98);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

/* ===== 响应式：GitHub 导航 ===== */
@media (max-width: 768px) {
    .rail-divider { display: none; }
    .rail-label { font-size: 0.6rem; }
}

/* ===== 视频背景 ===== */
.hero-video-bg,
.practical-video-bg {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    width: 100%; height: 100%;
    object-fit: cover;
    opacity: 0.15;
    z-index: 0;
    pointer-events: none;
}
.hero-video-bg {
    mask-image: linear-gradient(to bottom, transparent, rgba(0,0,0,0.4) 30%, rgba(0,0,0,0.4) 70%, transparent);
    -webkit-mask-image: linear-gradient(to bottom, transparent, rgba(0,0,0,0.4) 30%, rgba(0,0,0,0.4) 70%, transparent);
}
.practical-video-bg {
    mask-image: linear-gradient(to bottom, rgba(0,0,0,0.4), transparent);
    -webkit-mask-image: linear-gradient(to bottom, rgba(0,0,0,0.4), transparent);
}
[data-theme="light"] .hero-video-bg,
[data-theme="light"] .practical-video-bg { opacity: 0.08; }

/* ===== GitHub 章节装饰图 ===== */
.category-wrapper[data-category="github-basic"] .cat-header,
.category-wrapper[data-category="github-advanced"] .cat-header,
.category-wrapper[data-category="github-workflow"] .cat-header {
    position: relative;
    overflow: hidden;
}
.category-wrapper[data-category="github-basic"] .cat-header::before {
    content: '';
    position: absolute;
    top: -20px; right: -40px;
    width: 240px; height: 180px;
    background-image: url('../assets/github-network.jpg');
    background-size: cover;
    background-position: center;
    opacity: 0.08;
    border-radius: 12px;
    z-index: 0;
    pointer-events: none;
}
.category-wrapper[data-category="github-advanced"] .cat-header::before {
    content: '';
    position: absolute;
    top: -20px; right: -40px;
    width: 240px; height: 180px;
    background-image: url('../assets/github-hero.jpg');
    background-size: cover;
    background-position: center;
    opacity: 0.08;
    border-radius: 12px;
    z-index: 0;
    pointer-events: none;
}
.category-wrapper[data-category="github-workflow"] .cat-header::before {
    content: '';
    position: absolute;
    top: -20px; right: -40px;
    width: 240px; height: 180px;
    background-image: url('../assets/scenario-advanced.jpg');
    background-size: cover;
    background-position: center;
    opacity: 0.08;
    border-radius: 12px;
    z-index: 0;
    pointer-events: none;
}
.category-wrapper[data-category="github-basic"] .cat-header > *,
.category-wrapper[data-category="github-advanced"] .cat-header > *,
.category-wrapper[data-category="github-workflow"] .cat-header > * {
    position: relative;
    z-index: 1;
}

/* ===== 知识图谱页面 ===== */
.graph-mode {
    min-height: 100vh;
    padding: 0;
    animation: graphFadeIn 0.3s ease-out;
}
@keyframes graphFadeIn {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}
.kg-container {
    width: 100%;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* 图谱头部 */
.kg-header {
    position: relative;
    padding: 80px 32px 40px;
    text-align: center;
    overflow: hidden;
    border-bottom: 1px solid var(--border);
}
.kg-header::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background-image: url('../assets/github-network.jpg');
    background-size: cover;
    background-position: center;
    opacity: 0.06;
    z-index: 0;
    mask-image: linear-gradient(to bottom, rgba(0,0,0,0.6), transparent);
    -webkit-mask-image: linear-gradient(to bottom, rgba(0,0,0,0.6), transparent);
}
.kg-header-video {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    width: 100%; height: 100%;
    object-fit: cover;
    opacity: 0.08;
    z-index: 0;
    pointer-events: none;
    mask-image: linear-gradient(to bottom, rgba(0,0,0,0.5), transparent);
    -webkit-mask-image: linear-gradient(to bottom, rgba(0,0,0,0.5), transparent);
}
[data-theme="light"] .kg-header-video { opacity: 0.04; }
.kg-header-content {
    position: relative;
    z-index: 1;
    max-width: 680px;
    margin: 0 auto;
}
.kg-eyebrow {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.75rem;
    letter-spacing: 4px;
    color: var(--gh-purple);
    margin-bottom: 16px;
    text-transform: uppercase;
}
.kg-title {
    font-family: 'Noto Serif SC', serif;
    font-size: clamp(2.2rem, 5vw, 3.5rem);
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 16px;
    color: var(--text-primary);
}
.kg-title .accent {
    background: var(--gh-purple-grad);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-style: italic;
}
.kg-subtitle {
    font-size: 1rem;
    color: var(--text-secondary);
    max-width: 560px;
    margin: 0 auto;
    line-height: 1.8;
}

/* 画布容器 */
.kg-canvas-wrap {
    position: relative;
    flex: 1;
    display: flex;
    min-height: 0;
    /* 性能隔离：限制重排重绘范围 */
    contain: layout style;
}

/* 星系背景图层（seedream 生成的星系图片） */
.kg-galaxy-bg {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background-image: url('../assets/galaxy-bg.jpg');
    background-size: cover;
    background-position: center;
    opacity: 0.35;
    z-index: 0;
    pointer-events: none;
    transition: transform 0.1s linear;
    will-change: transform;
    /* 入场动画 */
    animation: galaxyFadeIn 1.5s ease-out;
}
@keyframes galaxyFadeIn {
    from { opacity: 0; }
    to { opacity: 0.35; }
}

/* 星系背景叠加渐变（让 Three.js 画布与背景图融合） */
.kg-galaxy-overlay {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background: radial-gradient(ellipse at center,
        transparent 0%,
        rgba(10, 8, 20, 0.4) 50%,
        rgba(10, 8, 20, 0.85) 100%);
    z-index: 1;
    pointer-events: none;
}

.kg-canvas-container {
    flex: 1;
    min-height: 600px;
    height: calc(100vh - 280px);
    cursor: grab;
    position: relative;
    z-index: 2;
}
.kg-canvas-container:active {
    cursor: grabbing;
}
.kg-canvas-container canvas {
    display: block;
    width: 100% !important;
    height: 100% !important;
}

/* 图例 */
.kg-legend {
    position: absolute;
    top: 20px;
    left: 20px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 14px 16px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    z-index: 10;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    box-shadow: 0 4px 24px rgba(0,0,0,0.2);
}
.kg-legend-item {
    display: flex;
    align-items: center;
    gap: 8px;
}
.kg-legend-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    flex-shrink: 0;
}
.kg-legend-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    font-family: 'JetBrains Mono', monospace;
}

/* 信息面板 */
.kg-info-panel {
    position: absolute;
    bottom: 20px;
    right: 20px;
    width: 280px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 16px;
    z-index: 10;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    box-shadow: 0 4px 24px rgba(0,0,0,0.2);
    transition: opacity 0.3s, transform 0.3s;
    opacity: 0.7;
}
.kg-info-panel.active {
    opacity: 1;
}
.kg-info-empty {
    color: var(--text-tertiary);
    font-size: 0.8rem;
    text-align: center;
    padding: 8px 0;
}
.kg-info-card {
    display: flex;
    flex-direction: column;
    gap: 10px;
}
.kg-info-head {
    display: flex;
    align-items: center;
    gap: 10px;
}
.kg-info-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    flex-shrink: 0;
}
.kg-info-label {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--text-primary);
}
.kg-info-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.kg-info-cat {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 600;
}
.kg-info-action {
    font-size: 0.7rem;
    color: var(--text-tertiary);
}
.kg-backlinks {
    border-top: 1px solid var(--border);
    padding-top: 10px;
}
.kg-backlinks-title {
    font-size: 0.7rem;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 1px;
    display: block;
    margin-bottom: 8px;
}
.kg-backlinks-list {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
}
.kg-backlink-item {
    font-size: 0.7rem;
    padding: 3px 8px;
    border-radius: 4px;
    background: rgba(79, 195, 247, 0.1);
    color: #4fc3f7;
    font-family: 'JetBrains Mono', monospace;
}
.kg-nav-hint {
    margin-top: 10px;
    padding: 8px 12px;
    border-radius: 8px;
    background: rgba(255, 179, 71, 0.1);
    color: #ffb347;
    font-size: 0.75rem;
    text-align: center;
    animation: kgPulse 0.8s ease-in-out infinite;
}
@keyframes kgPulse {
    0%, 100% { opacity: 0.7; }
    50% { opacity: 1; }
}

/* 控制按钮 */
.kg-controls {
    position: absolute;
    top: 20px;
    right: 20px;
    display: flex;
    gap: 8px;
    z-index: 10;
}
.kg-ctrl-btn {
    padding: 6px 14px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--bg-card);
    color: var(--text-secondary);
    font-size: 0.75rem;
    font-family: 'JetBrains Mono', monospace;
    cursor: pointer;
    transition: all 0.2s;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}
.kg-ctrl-btn:hover {
    border-color: var(--gh-purple);
    color: var(--gh-purple);
    background: rgba(139, 92, 246, 0.08);
}

/* 响应式：知识图谱 */
@media (max-width: 768px) {
    .kg-legend {
        top: 10px;
        left: 10px;
        padding: 8px 10px;
        flex-direction: row;
        flex-wrap: wrap;
        max-width: 180px;
    }
    .kg-legend-label { font-size: 0.65rem; }
    .kg-info-panel {
        bottom: 10px;
        right: 10px;
        left: 10px;
        width: auto;
        max-width: none;
    }
    .kg-controls {
        top: auto;
        bottom: 200px;
        right: 10px;
    }
    .kg-canvas-container {
        height: calc(100vh - 200px);
        min-height: 400px;
    }
}

/* ===== 实战场景卡片 GitHub 标记 ===== */
.scenario-item[data-chapter="GitHub"] {
    border-left: 3px solid var(--gh-purple);
}
.scenario-item[data-chapter="GitHub"] .scenario-chapter {
    color: var(--gh-purple);
    background: rgba(139, 92, 246, 0.1);
}