/* ============================================
   侨水AI智能体 - 深邃学术风格主题
   灵感来源：时空分型周期论网站
   ============================================ */

:root {
    /* 核心色调 - 深邃宇宙黑 */
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-card: rgba(18, 18, 26, 0.85);
    --bg-hover: rgba(30, 30, 45, 0.6);
    
    /* 金色系 - 周期智慧 */
    --gold-primary: #d4af37;
    --gold-light: #f4d03f;
    --gold-dark: #b8860b;
    --gold-glow: rgba(212, 175, 55, 0.3);
    
    /* 文字颜色 - 高对比度 */
    --text-primary: #ffffff;
    --text-secondary: rgba(255, 255, 255, 0.7);
    --text-muted: rgba(255, 255, 255, 0.5);
    --text-accent: #f4d03f;
    
    /* 强调色 */
    --accent-cyan: #00d4ff;
    --accent-purple: #9b59b6;
    --accent-green: #27ae60;
    --accent-red: #e74c3c;
    
    /* 边框与分割 */
    --border-gold: rgba(212, 175, 55, 0.3);
    --border-subtle: rgba(255, 255, 255, 0.1);
    
    /* 渐变预设 */
    --gradient-gold: linear-gradient(135deg, #d4af37 0%, #f4d03f 50%, #d4af37 100%);
    --gradient-dark: linear-gradient(180deg, #0a0a0f 0%, #1a1a2e 100%);
    --gradient-card: linear-gradient(135deg, rgba(212, 175, 55, 0.05) 0%, rgba(0, 212, 255, 0.05) 100%);
    
    /* 阴影 */
    --shadow-gold: 0 0 30px rgba(212, 175, 55, 0.2);
    --shadow-card: 0 10px 40px rgba(0, 0, 0, 0.5);
    
    /* 字体 */
    --font-primary: 'Noto Serif SC', 'Microsoft YaHei', serif;
    --font-mono: 'JetBrains Mono', 'Consolas', monospace;
}

/* ============================================
   全局重置与基础样式
   ============================================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-primary);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.8;
    min-height: 100vh;
    overflow-x: hidden;
}

/* 背景星空效果 */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        radial-gradient(2px 2px at 20px 30px, rgba(212, 175, 55, 0.3), transparent),
        radial-gradient(2px 2px at 40px 70px, rgba(255, 255, 255, 0.2), transparent),
        radial-gradient(1px 1px at 90px 40px, rgba(212, 175, 55, 0.3), transparent),
        radial-gradient(2px 2px at 160px 120px, rgba(255, 255, 255, 0.2), transparent);
    background-repeat: repeat;
    background-size: 200px 200px;
    opacity: 0.5;
    z-index: -1;
    pointer-events: none;
}

/* ============================================
   导航栏 - 悬浮玻璃效果
   ============================================ */
.nav-bar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(10, 10, 15, 0.9);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-gold);
    padding: 15px 30px;
    z-index: 1000;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--gold-primary);
    font-size: 1.3rem;
    font-weight: 600;
    text-decoration: none;
    letter-spacing: 2px;
}

.nav-logo::before {
    content: '☯';
    font-size: 1.5rem;
    color: var(--gold-primary);
    text-shadow: 0 0 20px var(--gold-glow);
}

.nav-back {
    color: var(--text-secondary);
    text-decoration: none;
    padding: 10px 20px;
    border: 1px solid var(--border-subtle);
    border-radius: 25px;
    transition: all 0.3s ease;
    font-size: 0.9rem;
}

.nav-back:hover {
    border-color: var(--gold-primary);
    color: var(--gold-primary);
    box-shadow: 0 0 20px var(--gold-glow);
}

/* ============================================
   头部区域 - 深邃大气
   ============================================ */
.header {
    text-align: center;
    padding: 100px 20px 60px;
    background: var(--gradient-dark);
    position: relative;
    overflow: hidden;
}

.header::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(212, 175, 55, 0.1) 0%, transparent 70%);
    pointer-events: none;
}

.header h1 {
    font-size: 3.5rem;
    font-weight: 300;
    letter-spacing: 8px;
    background: var(--gradient-gold);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 20px;
    position: relative;
}

.header p {
    color: var(--text-secondary);
    font-size: 1.2rem;
    letter-spacing: 3px;
}

/* ============================================
   卡片组件 - 玻璃拟态
   ============================================ */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border-gold);
    border-radius: 16px;
    padding: 35px;
    backdrop-filter: blur(10px);
    transition: all 0.4s ease;
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-gold);
    opacity: 0.5;
    transition: opacity 0.3s;
}

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

.card:hover::before {
    opacity: 1;
}

.card h2 {
    color: var(--gold-primary);
    font-size: 1.5rem;
    font-weight: 400;
    margin-bottom: 20px;
    letter-spacing: 2px;
    display: flex;
    align-items: center;
    gap: 10px;
}

/* ============================================
   按钮样式 - 金色质感
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    background: transparent;
    border: 1px solid var(--gold-primary);
    color: var(--gold-primary);
    border-radius: 30px;
    cursor: pointer;
    font-size: 1rem;
    letter-spacing: 1px;
    transition: all 0.3s ease;
    text-decoration: none;
}

.btn:hover {
    background: var(--gold-primary);
    color: var(--bg-primary);
    box-shadow: 0 0 30px var(--gold-glow);
    transform: translateY(-2px);
}

.btn-primary {
    background: var(--gradient-gold);
    border: none;
    color: var(--bg-primary);
    font-weight: 600;
}

.btn-primary:hover {
    box-shadow: 0 5px 25px rgba(212, 175, 55, 0.4);
}

/* ============================================
   导航标签 - 悬浮效果
   ============================================ */
.nav-tabs {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
    justify-content: center;
    margin: 40px 0;
}

.nav-tab {
    padding: 12px 24px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-subtle);
    border-radius: 25px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.95rem;
    letter-spacing: 1px;
    transition: all 0.3s ease;
}

.nav-tab:hover,
.nav-tab.active {
    background: rgba(212, 175, 55, 0.1);
    border-color: var(--gold-primary);
    color: var(--gold-primary);
    box-shadow: 0 0 20px var(--gold-glow);
}

/* ============================================
   数据展示 - 高亮数字
   ============================================ */
.stat-number {
    font-size: 2.5rem;
    font-weight: 300;
    color: var(--gold-primary);
    text-shadow: 0 0 20px var(--gold-glow);
    font-family: var(--font-mono);
}

.highlight-number {
    font-family: var(--font-mono);
    color: var(--gold-primary);
    font-weight: 600;
}

/* ============================================
   章节标题 - 中式风格
   ============================================ */
.section-title {
    font-size: 2rem;
    color: var(--gold-primary);
    font-weight: 300;
    letter-spacing: 4px;
    margin: 60px 0 30px;
    padding-bottom: 15px;
    border-bottom: 1px solid var(--border-gold);
    display: flex;
    align-items: center;
    gap: 15px;
}

.section-title::before {
    content: '';
    width: 4px;
    height: 30px;
    background: var(--gradient-gold);
    border-radius: 2px;
}

/* ============================================
   引用框 - 哲学感
   ============================================ */
.quote-box {
    background: rgba(212, 175, 55, 0.05);
    border-left: 3px solid var(--gold-primary);
    padding: 25px 30px;
    margin: 30px 0;
    font-style: italic;
    color: var(--text-secondary);
    position: relative;
}

.quote-box::before {
    content: '"';
    position: absolute;
    top: 10px;
    left: 15px;
    font-size: 3rem;
    color: var(--gold-primary);
    opacity: 0.3;
    font-family: serif;
}

/* ============================================
   表格样式 - 深邃简洁
   ============================================ */
table {
    width: 100%;
    border-collapse: collapse;
    margin: 25px 0;
    background: rgba(255, 255, 255, 0.02);
    border-radius: 8px;
    overflow: hidden;
}

th {
    background: rgba(212, 175, 55, 0.15);
    color: var(--gold-primary);
    padding: 15px;
    text-align: left;
    font-weight: 500;
    letter-spacing: 1px;
}

td {
    padding: 15px;
    border-bottom: 1px solid var(--border-subtle);
    color: var(--text-secondary);
}

tr:hover td {
    background: var(--bg-hover);
    color: var(--text-primary);
}

/* ============================================
   时间轴 - 周期感
   ============================================ */
.timeline {
    position: relative;
    padding-left: 30px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(180deg, var(--gold-primary) 0%, transparent 100%);
}

.timeline-item {
    position: relative;
    padding: 20px 0 20px 30px;
    border-bottom: 1px solid var(--border-subtle);
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -34px;
    top: 25px;
    width: 10px;
    height: 10px;
    background: var(--gold-primary);
    border-radius: 50%;
    box-shadow: 0 0 15px var(--gold-glow);
}

/* ============================================
   加载动画
   ============================================ */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid var(--border-subtle);
    border-top-color: var(--gold-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ============================================
   滚动条美化
   ============================================ */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
    background: var(--gold-dark);
    border-radius: 4px;
}

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

/* ============================================
   响应式适配
   ============================================ */
@media (max-width: 768px) {
    .header h1 {
        font-size: 2rem;
        letter-spacing: 4px;
    }
    
    .nav-tabs {
        gap: 10px;
    }
    
    .nav-tab {
        padding: 8px 16px;
        font-size: 0.85rem;
    }
    
    .card {
        padding: 20px;
    }
    
    .stat-number {
        font-size: 1.8rem;
    }
}

/* ============================================
   特殊效果 - 光晕
   ============================================ */
.glow-text {
    text-shadow: 0 0 20px var(--gold-glow);
}

.glow-box {
    box-shadow: 0 0 30px var(--gold-glow);
}

/* 分隔线 - 金色渐变 */
.divider {
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--gold-primary), transparent);
    margin: 40px 0;
    opacity: 0.5;
}