/* ============================================
 * 考前集训 · NOI 2025 一本通 - 专属样式表 v3.0
 * 特性：完整代码块 + 行号 + 关键词高亮 + 超详细内容排版
 * ============================================ */

/* ===== CSS 变量 ===== */
:root {
    --train-bg: #0f172a;
    --train-surface: #1e1e2e;
    --train-border: #2d2d44;
    --train-code-text: #cdd6f4;
    --train-keyterm-bg: #fef3c7;
    --train-keyterm-text: #92400e;
    --train-keyterm-border: #f59e0b;
    --train-memory-bg: #fce7f3;
    --train-memory-text: #9d174d;
    --train-memory-border: #ec4899;
}

/* ===== Hero 区域 ===== */
.train-hero {
    position: relative;
    min-height: 520px;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    overflow: hidden;
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 30%, #172554 60%, #0f172a 100%);
}
.train-hero-bg {
    position: absolute;
    inset: 0;
    background: 
        radial-gradient(ellipse at 20% 50%, rgba(14,165,233,0.15) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 50%, rgba(139,92,246,0.15) 0%, transparent 50%),
        radial-gradient(ellipse at 50% 20%, rgba(245,158,11,0.1) 0%, transparent 40%);
}
.train-hero-bg::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image: url("data:image/svg+xml,%3Csvg width='60' height='60' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M30 5 L31 29 L55 30 L31 31 L30 55 L29 31 L5 30 L29 29Z' fill='rgba(148,163,184,0.06)'/%3E%3C/svg%3E");
    mask-image: linear-gradient(to bottom, transparent 0%, black 30%, black 70%, transparent 100%);
}
.train-hero-content {
    position: relative;
    z-index: 1;
    padding: 60px 20px;
    max-width: 800px;
}
.train-hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(245,158,11,0.15);
    border: 1px solid rgba(245,158,11,0.3);
    color: #fbbf24;
    padding: 6px 16px;
    border-radius: 50px;
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 24px;
}
.train-hero-title {
    font-size: clamp(36px, 6vw, 56px);
    font-weight: 900;
    background: linear-gradient(135deg, #38bdf8, #a78bfa, #fbbf24);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin: 0 0 16px;
    line-height: 1.2;
}
.train-hero-subtitle {
    font-size: 16px;
    color: #94a3b8;
    line-height: 1.8;
    margin-bottom: 36px;
}
.train-hero-subtitle strong {
    color: #fbbf24;
}
.train-hero-stats {
    display: flex;
    justify-content: center;
    gap: 40px;
    flex-wrap: wrap;
}
.train-stat {
    text-align: center;
}
.train-stat-num {
    display: block;
    font-size: 32px;
    font-weight: 800;
    background: linear-gradient(135deg, #38bdf8, #a78bfa);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.train-stat-label {
    display: block;
    font-size: 13px;
    color: #64748b;
    margin-top: 4px;
}
.train-hero-scroll {
    margin-top: 36px;
    color: #475569;
    font-size: 13px;
    animation: bounce 2s infinite;
}
@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(8px); }
}

/* ===== 大纲导航卡片 ===== */
.train-nav-section {
    background: #f1f5f9;
    padding: 32px 20px;
}
.train-nav-container {
    max-width: 1100px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 16px;
}
.train-nav-card {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 20px;
    border-radius: 16px;
    background: white;
    border: 2px solid #e2e8f0;
    text-decoration: none;
    transition: all 0.3s ease;
    cursor: pointer;
}
.train-nav-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 40px rgba(0,0,0,0.08);
}
.train-nav-card.basic:hover { border-color: #0ea5e9; }
.train-nav-card.advanced:hover { border-color: #f59e0b; }
.train-nav-card.noi:hover { border-color: #ef4444; }
.train-nav-card.locked { opacity: 0.65; }
.train-nav-icon {
    width: 52px; height: 52px;
    border-radius: 14px;
    display: flex; align-items: center; justify-content: center;
    font-size: 22px;
    flex-shrink: 0;
}
.train-nav-card.basic .train-nav-icon { background: #e0f2fe; color: #0284c7; }
.train-nav-card.advanced .train-nav-icon { background: #fef3c7; color: #d97706; }
.train-nav-card.noi .train-nav-icon { background: #fee2e2; color: #dc2626; }
.train-nav-info { flex: 1; }
.train-nav-level { font-size: 11px; font-weight: 700; text-transform: uppercase; color: #94a3b8; display: block; }
.train-nav-info strong { font-size: 16px; color: #1e293b; display: block; margin: 2px 0; }
.train-nav-info small { font-size: 12px; color: #94a3b8; }
.train-nav-status { font-size: 12px; padding: 4px 10px; border-radius: 50px; font-weight: 600; }
.train-nav-status.unlocked { background: #dcfce7; color: #16a34a; }
.train-nav-status:not(.unlocked) { background: #fef3c7; color: #d97706; }

/* ===== 进度条 ===== */
.train-progress-section {
    background: white;
    border-bottom: 1px solid #e2e8f0;
    padding: 20px;
}
.train-progress-container {
    max-width: 1100px; margin: 0 auto;
}
.train-progress-header {
    display: flex; justify-content: space-between; align-items: center;
    margin-bottom: 10px;
}
.train-progress-header h3 { margin: 0; font-size: 15px; color: #334155; }
.train-progress-pct { font-size: 22px; font-weight: 800; color: #0ea5e9; }
.train-progress-bar-wrap {
    height: 8px; background: #e2e8f0; border-radius: 99px; overflow: hidden;
}
.train-progress-bar {
    height: 100%; border-radius: 99px;
    background: linear-gradient(90deg, #0ea5e9, #8b5cf6);
    transition: width 0.6s ease;
    position: relative; overflow: hidden;
}
.train-progress-glow {
    position: absolute; inset: 0;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.4), transparent);
    animation: shimmer 2s infinite;
}
@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(200%); }
}
.train-progress-detail {
    display: flex; justify-content: space-between; align-items: center;
    margin-top: 8px; font-size: 12px; color: #94a3b8;
}
.train-progress-vip-hint { color: #f59e0b; font-weight: 600; }

/* ===== 等级分区标题 ===== */
.train-level-header {
    display: flex; align-items: center; gap: 20px;
    max-width: 1100px; margin: 0 auto;
    padding: 48px 20px 24px;
}
.train-level-icon-wrap {
    width: 72px; height: 72px; border-radius: 20px;
    display: flex; align-items: center; justify-content: center;
    font-size: 32px;
    flex-shrink: 0;
    background: linear-gradient(135deg, #e0f2fe, #bae6fd);
    color: #0284c7;
    box-shadow: 0 8px 24px rgba(14,165,233,0.15);
}
#level-advanced .train-level-icon-wrap {
    background: linear-gradient(135deg, #fef3c7, #fde68a);
    color: #d97706;
    box-shadow: 0 8px 24px rgba(245,158,11,0.15);
}
#level-noi .train-level-icon-wrap {
    background: linear-gradient(135deg, #fee2e2, #fecaca);
    color: #dc2626;
    box-shadow: 0 8px 24px rgba(239,68,68,0.15);
}
.train-level-info h2 { margin: 0; font-size: 28px; color: #1e293b; }
.train-level-en { font-size: 13px; color: #64748b; font-weight: 600; display: block; margin: 4px 0; }
.train-level-info p { font-size: 14px; color: #64748b; margin: 6px 0 0; max-width: 600px; }

/* ===== 内容区域 ===== */
.train-level-content { max-width: 1100px; margin: 0 auto; padding: 0 20px 40px; }

/* ===== 单个知识区块 ===== */
.train-section {
    background: white; border: 1px solid #e2e8f0; border-radius: 16px;
    margin-bottom: 12px; overflow: hidden;
    transition: all 0.3s ease;
}
.train-section:hover { border-color: #cbd5e1; box-shadow: 0 4px 20px rgba(0,0,0,0.05); }
.train-section.locked { opacity: 0.7; }
.train-sec-header {
    display: flex; justify-content: space-between; align-items: center;
    padding: 16px 20px; cursor: pointer; user-select: none;
    transition: background 0.2s;
}
.train-sec-header:hover { background: #f8fafc; }
.train-sec-header-left { display: flex; align-items: center; gap: 14px; }
.train-sec-icon {
    width: 40px; height: 40px; border-radius: 12px;
    background: #f1f5f9; display: flex; align-items: center; justify-content: center;
    font-size: 16px; color: #64748b; flex-shrink: 0;
}
.train-sec-title-group { display: flex; flex-direction: column; gap: 4px; }
.train-sec-level-badge {
    display: inline-block; font-size: 10px; font-weight: 700; padding: 2px 8px;
    border-radius: 50px; width: fit-content;
}
.level-1, .level-2 { background: #dcfce7; color: #16a34a; }
.level-3, .level-4 { background: #dbeafe; color: #2563eb; }
.level-5 { background: #fef3c7; color: #d97706; }
.level-6 { background: #fed7aa; color: #ea580c; }
.level-7 { background: #fecaca; color: #dc2626; }
.level-8, .level-9, .level-10 { background: #fce7f3; color: #be185d; }
.train-sec-title { margin: 0; font-size: 16px; color: #1e293b; font-weight: 700; }
.train-sec-header-right { display: flex; align-items: center; gap: 8px; }
.train-sec-toggle {
    width: 28px; height: 28px; border-radius: 50%;
    background: #f1f5f9; display: flex; align-items: center; justify-content: center;
    font-size: 12px; color: #94a3b8; transition: transform 0.3s;
}
.train-section.open .train-sec-toggle { transform: rotate(180deg); }
.train-lock-badge {
    display: flex; align-items: center; justify-content: center;
    width: 32px; height: 32px; border-radius: 50%;
    background: #fef3c7; color: #d97706; font-size: 14px;
}

/* ===== 区块内容体 ===== */
.train-sec-body { display: none; padding: 0 20px 20px; border-top: 1px solid #f1f5f9; }
.train-section.open .train-sec-body { display: block; }

.train-sec-explain { font-size: 14px; color: #475569; line-height: 1.9; }
.train-sec-explain p { margin: 0 0 14px; }
.train-sec-explain strong { color: #1e293b; }
.train-sec-explain code {
    background: #f1f5f9; padding: 1px 6px; border-radius: 4px;
    font-family: 'JetBrains Mono', monospace; font-size: 13px; color: #0ea5e9;
}
.train-sec-explain ul, .train-sec-explain ol { padding-left: 22px; margin: 6px 0 14px; }
.train-sec-explain li { margin-bottom: 7px; }

/* ===== 大纲参照标签（2025新增） ===== */
.train-outline-ref {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    background: #eff6ff;
    border: 1px solid #bfdbfe;
    color: #1d4ed8;
    padding: 3px 10px;
    border-radius: 6px;
    font-size: 12px;
    font-weight: 600;
    margin-left: 6px;
    vertical-align: middle;
}

/* ===== ✨ 关键词高亮标注 - 学生记忆专用 ✨ ===== */
.key-term {
    background: linear-gradient(180deg, transparent 60%, #fde68a 60%);
    padding: 0 3px;
    border-radius: 2px;
    font-weight: 700;
    color: #92400e;
    cursor: help;
    border-bottom: 2px dashed #f59e0b;
    transition: all 0.2s;
}
.key-term:hover {
    background: linear-gradient(180deg, transparent 50%, #fbbf24 50%);
    border-bottom-color: #d97706;
}

/* 必须记住的关键公式/数值 */
.key-formula {
    display: inline-block;
    background: #fef3c7;
    border: 1.5px solid #f59e0b;
    padding: 2px 8px;
    border-radius: 6px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 13px;
    font-weight: 700;
    color: #92400e;
    letter-spacing: 0.3px;
}

/* 易错点高亮 */
.key-danger {
    background: linear-gradient(180deg, transparent 60%, #fecaca 60%);
    padding: 0 3px;
    border-radius: 2px;
    font-weight: 700;
    color: #991b1b;
    cursor: help;
    border-bottom: 2px dashed #ef4444;
}
.key-danger:hover {
    background: linear-gradient(180deg, transparent 50%, #fca5a5 50%);
}

/* 省一必考点标注 */
.key-gold {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    background: linear-gradient(135deg, #fef3c7, #fde68a);
    border: 1px solid #f59e0b;
    color: #92400e;
    padding: 4px 12px;
    border-radius: 50px;
    font-size: 12px;
    font-weight: 700;
}

/* 记忆口诀块 */
.train-mnemonic {
    background: linear-gradient(135deg, #fdf2f8, #fce7f3);
    border: 2px dashed #ec4899;
    border-radius: 12px;
    padding: 14px 18px;
    margin: 14px 0;
    position: relative;
}
.train-mnemonic::before {
    content: '🧠 记忆口诀';
    display: block;
    font-size: 12px;
    font-weight: 800;
    color: #be185d;
    margin-bottom: 6px;
    letter-spacing: 0.5px;
}
.train-mnemonic p {
    margin: 0;
    font-size: 13px;
    color: #831843;
    font-weight: 600;
    line-height: 1.6;
}

/* 复杂度分析标签 */
.complexity-tag {
    display: inline-block;
    background: #1e1e2e;
    color: #a6e3a1;
    padding: 2px 8px;
    border-radius: 4px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.3px;
}

/* 迷你表格 */
.train-mini-table {
    width: 100%; border-collapse: collapse; font-size: 13px; margin: 10px 0;
}
.train-mini-table th {
    background: #f8fafc; padding: 10px 12px; text-align: left;
    font-weight: 700; color: #475569; border-bottom: 2px solid #e2e8f0;
}
.train-mini-table td {
    padding: 10px 12px; border-bottom: 1px solid #f1f5f9; color: #64748b;
}
.train-mini-table tr:hover td { background: #f8fafc; }
.train-mini-table td code {
    background: #f1f5f9; padding: 1px 6px; border-radius: 3px;
    font-family: 'JetBrains Mono', monospace; font-size: 12px; color: #0ea5e9;
}

/* ============================================
 * 🖥️ 代码块 · 完整代码 + 行号 + 语法高亮 v3.0
 * ============================================ */
.train-code-block {
    background: #1e1e2e;
    border-radius: 14px;
    overflow: hidden;
    margin: 20px 0;
    border: 1px solid #2d2d44;
    box-shadow: 0 4px 24px rgba(0,0,0,0.15), inset 0 1px 0 rgba(255,255,255,0.03);
}
.train-code-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 20px;
    background: linear-gradient(135deg, #252540, #1e1e2e);
    border-bottom: 1px solid #2d2d44;
}
.train-code-lang {
    color: #cdd6f4;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.3px;
    display: flex;
    align-items: center;
    gap: 8px;
}
.train-code-lang i { color: #89b4fa; font-size: 14px; }
.train-code-lang::before {
    content: '';
    display: inline-block;
    width: 8px; height: 8px;
    border-radius: 50%;
    background: #f38ba8;
    box-shadow: 14px 0 0 #fab387, 28px 0 0 #a6e3a1;
}
.train-code-copy {
    background: rgba(137,180,250,0.1);
    border: 1px solid rgba(137,180,250,0.2);
    color: #89b4fa;
    padding: 6px 14px;
    border-radius: 8px;
    font-size: 12px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.25s;
    display: flex;
    align-items: center;
    gap: 5px;
}
.train-code-copy:hover {
    background: rgba(137,180,250,0.2);
    border-color: rgba(137,180,250,0.4);
    color: #b4d0fb;
    transform: translateY(-1px);
}
.train-code-copy.copied {
    background: rgba(166,227,161,0.15);
    border-color: rgba(166,227,161,0.35);
    color: #a6e3a1;
}

/* ===== Prism 代码块集成 ===== */
.train-code-block pre[class*="language-"] {
    margin: 0;
    padding: 20px 20px 20px 12px;
    background: #1e1e2e !important;
    border-radius: 0;
    font-family: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', 'Consolas', monospace;
    font-size: 13.5px;
    line-height: 1.75;
    tab-size: 4;
    overflow-x: auto;
    max-height: 600px;
    overflow-y: auto;
    -moz-tab-size: 4;
}
.train-code-block pre[class*="language-"] code[class*="language-"] {
    display: block;
    padding: 0;
    background: transparent !important;
    font-family: inherit;
    font-size: inherit;
    line-height: inherit;
    tab-size: inherit;
    -moz-tab-size: inherit;
    color: #cdd6f4;
    white-space: pre;
    word-wrap: normal;
    text-shadow: none;
}

/* 完整程序标识 */
.train-code-badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    background: rgba(166,227,161,0.12);
    border: 1px solid rgba(166,227,161,0.25);
    color: #a6e3a1;
    padding: 3px 10px;
    border-radius: 50px;
    font-size: 11px;
    font-weight: 700;
}

/* ===== Prism 行号 (line-numbers) ===== */
.train-code-block pre.line-numbers {
    position: relative;
    padding-left: 4.8em;
    counter-reset: linenumber;
}
.train-code-block pre.line-numbers > code {
    position: relative;
    white-space: inherit;
    padding-left: 0.6em !important;
}
.train-code-block .line-numbers .line-numbers-rows {
    position: absolute;
    pointer-events: none;
    top: 20px;
    left: 0;
    width: 3.8em;
    border-right: 2px solid #313244;
    background: rgba(0,0,0,0.2);
    user-select: none;
    -webkit-user-select: none;
    font-size: 13.5px;
    line-height: 1.75;
    letter-spacing: -0.5px;
    padding-top: 0;
    padding-bottom: 0;
    counter-reset: linenumber;
}
.train-code-block .line-numbers .line-numbers-rows > span {
    display: block;
    counter-increment: linenumber;
    pointer-events: none;
    text-align: right;
    padding: 0 0.8em 0 0;
    color: #6c7086;
    height: 1.75em;
    font-family: 'JetBrains Mono', monospace;
    font-size: 12px;
    transition: color 0.2s;
}
.train-code-block .line-numbers .line-numbers-rows > span::before {
    content: counter(linenumber);
    display: block;
    color: inherit;
}
.train-code-block .line-numbers .line-numbers-rows > span:hover {
    color: #a6adc8;
}

/* ===== Prism C++ 语法着色增强（Catppuccin Mocha 主题） ===== */
.token.keyword { color: #cba6f7; font-weight: 600; font-style: normal; }
.token.builtin, .token.class-name { color: #f9e2af; }
.token.function { color: #89b4fa; }
.token.string { color: #a6e3a1; }
.token.number { color: #fab387; }
.token.comment { color: #6c7086; font-style: italic; }
.token.block-comment { color: #6c7086; font-style: italic; }
.token.operator { color: #89dceb; }
.token.punctuation { color: #bac2de; }
.token.variable { color: #cdd6f4; }
.token.property { color: #94e2d5; }
.token.constant { color: #fab387; }
.token.macro-name { color: #f38ba8; }
.token.important, .token.bold { font-weight: 700; }
.token.italic { font-style: italic; }
.token.inserted { color: #a6e3a1; }
.token.deleted { color: #f38ba8; }
.token.selector { color: #cba6f7; }
.token.regex { color: #f9e2af; }
.token.url { color: #89b4fa; text-decoration: underline; }
.token.directive-hash { color: #89dceb; }
.token.directive { color: #89b4fa; }
.token.template-punctuation { color: #89dceb; }
.token.char { color: #a6e3a1; }
.token.attr-name { color: #f9e2af; }
.token.attr-value { color: #a6e3a1; }

/* ===== 行号高亮 ===== */
.train-code-block .line-highlight {
    position: absolute;
    left: 0; right: 0;
    margin-top: 20px;
    background: rgba(137,180,250,0.05);
    pointer-events: none;
    line-height: inherit;
    white-space: pre;
}
.train-code-block .line-highlight::before,
.train-code-block .line-highlight[data-end]::after {
    display: none;
}

/* 代码文件信息提示 */
.train-code-fileinfo {
    font-size: 11px;
    color: #6c7086;
    padding: 4px 16px;
    background: rgba(0,0,0,0.12);
    border-bottom: 1px solid #2d2d44;
    font-family: 'JetBrains Mono', monospace;
    display: flex;
    align-items: center;
    gap: 8px;
}
.train-code-fileinfo i { color: #89b4fa; font-size: 12px; }

/* ===== 提示块 ===== */
.train-tips {
    background: linear-gradient(135deg, #fefce8, #fffbeb);
    border: 1px solid #fde68a; border-radius: 12px; margin: 16px 0; overflow: hidden;
}
.train-tips-header {
    padding: 12px 16px; font-size: 14px; font-weight: 700; color: #92400e;
    border-bottom: 1px solid #fde68a;
    display: flex; align-items: center; gap: 8px;
}
.train-tips-content { padding: 14px 16px; font-size: 13px; color: #78350f; line-height: 1.8; }
.train-tips-content ul { padding-left: 18px; margin: 4px 0; }
.train-tips-content li { margin-bottom: 6px; }
.train-tips-content strong { color: #92400e; }

/* 区块底部 */
.train-sec-footer { margin-top: 12px; text-align: right; }
.train-mark-done {
    background: #f0fdf4; border: 1px solid #bbf7d0; color: #16a34a;
    padding: 8px 18px; border-radius: 10px; font-size: 13px; font-weight: 600;
    cursor: pointer; transition: all 0.2s;
}
.train-mark-done:hover { background: #dcfce7; }
.train-mark-done.done { background: #dcfce7; border-color: #86efac; }

/* ===== 锁定内容 ===== */
.train-section.locked .train-sec-body { display: flex !important; justify-content: center; padding: 40px 20px !important; border-top: 1px solid #f1f5f9; }
.train-locked-message {
    text-align: center; max-width: 400px;
}
.train-locked-icon {
    width: 64px; height: 64px; border-radius: 50%;
    background: linear-gradient(135deg, #fef3c7, #fde68a);
    display: flex; align-items: center; justify-content: center;
    font-size: 28px; color: #d97706; margin: 0 auto 16px;
}
.train-locked-message h4 { font-size: 16px; color: #1e293b; margin: 0 0 8px; }
.train-locked-message p { font-size: 13px; color: #94a3b8; margin: 0 0 16px; }
.train-vip-btn {
    display: inline-flex; align-items: center; gap: 6px;
    background: linear-gradient(135deg, #f59e0b, #d97706);
    color: white; padding: 10px 24px; border-radius: 50px;
    font-size: 14px; font-weight: 700; text-decoration: none;
    box-shadow: 0 4px 16px rgba(245,158,11,0.3);
    transition: all 0.3s;
}
.train-vip-btn:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(245,158,11,0.4); }

/* ===== 锁定横幅 ===== */
.train-lock-banner {
    max-width: 1100px; margin: 40px auto; padding: 0 20px;
}
.train-lock-banner-content {
    background: linear-gradient(135deg, #1e293b, #0f172a);
    border-radius: 20px; padding: 40px; text-align: center;
    border: 1px solid #f59e0b33;
}
.train-lock-banner-icon {
    width: 64px; height: 64px; border-radius: 50%;
    background: linear-gradient(135deg, #f59e0b, #d97706);
    display: flex; align-items: center; justify-content: center;
    font-size: 28px; color: white; margin: 0 auto 16px;
    box-shadow: 0 8px 24px rgba(245,158,11,0.4);
}
.train-lock-banner-content h3 { font-size: 22px; color: white; margin: 0 0 8px; }
.train-lock-banner-content p { font-size: 14px; color: #94a3b8; margin: 0 0 20px; line-height: 1.8; }
.train-lock-banner-content strong { color: #fbbf24; }
.train-lock-banner-btns { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.train-btn-login {
    display: inline-flex; align-items: center; gap: 6px;
    background: rgba(255,255,255,0.1); border: 1px solid rgba(255,255,255,0.2);
    color: white; padding: 10px 24px; border-radius: 50px;
    font-size: 14px; font-weight: 600; text-decoration: none;
    transition: all 0.3s;
}
.train-btn-login:hover { background: rgba(255,255,255,0.2); }
.train-btn-vip {
    display: inline-flex; align-items: center; gap: 6px;
    background: linear-gradient(135deg, #f59e0b, #d97706);
    color: white; padding: 10px 24px; border-radius: 50px;
    font-size: 14px; font-weight: 700; text-decoration: none;
    box-shadow: 0 4px 16px rgba(245,158,11,0.4);
    transition: all 0.3s;
}
.train-btn-vip:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(245,158,11,0.6); }

/* ===== 响应式 ===== */
@media (max-width: 768px) {
    .train-hero { min-height: 400px; }
    .train-hero-title { font-size: 28px; }
    .train-hero-subtitle { font-size: 14px; }
    .train-hero-stats { gap: 20px; }
    .train-stat-num { font-size: 24px; }
    .train-nav-container { grid-template-columns: 1fr; }
    .train-level-header { padding: 32px 16px 20px; }
    .train-level-icon-wrap { width: 52px; height: 52px; font-size: 24px; }
    .train-level-info h2 { font-size: 22px; }
    .train-sec-header { padding: 12px 16px; }
    .train-sec-body { padding: 0 16px 16px; }
    .train-code-block pre[class*="language-"] { font-size: 11.5px; padding: 14px 12px 14px 10px; max-height: 400px; }
    .train-code-block pre.line-numbers { padding-left: 4em; }
    .train-code-block .line-numbers .line-numbers-rows { font-size: 11.5px; top: 14px; width: 3em; }
    .train-code-block .line-numbers .line-numbers-rows > span { height: 1.75em; font-size: 10px; }
    .train-lock-banner-content { padding: 24px; }
}