/* ============================================
   科技风导航站 - 样式表
   描述: 科技风、大气简洁、清爽风格的导航网站样式
   ============================================ */

/* CSS变量定义 - 明亮科技风颜色主题 */
:root {
    /* 主色调 - 清爽蓝紫系 */
    --tech-cyan: #0891B2;
    --tech-blue: #2563EB;
    --tech-purple: #7C3AED;
    --tech-indigo: #4F46E5;
    --tech-teal: #0D9488;
    --tech-green: #059669;
    
    /* 背景色 - 明亮清爽 */
    --bg-dark: #FFFFFF;
    --bg-card: #FFFFFF;
    --bg-gradient-start: #F0F9FF;
    --bg-gradient-end: #E0F2FE;
    
    /* 柔和发光色 */
    --glow-cyan: rgba(8, 145, 178, 0.15);
    --glow-blue: rgba(37, 99, 235, 0.15);
    --glow-purple: rgba(124, 58, 237, 0.15);
    --glow-teal: rgba(13, 148, 136, 0.15);
    
    /* 文字颜色 */
    --text-primary: #1E293B;
    --text-secondary: #475569;
    --text-muted: #64748B;
    
    /* 边框和效果 */
    --border-glow: rgba(8, 145, 178, 0.2);
    --card-radius: 16px;
    --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 基础重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: linear-gradient(135deg, var(--bg-gradient-start) 0%, var(--bg-gradient-end) 100%);
    min-height: 100vh;
    color: var(--text-primary);
    overflow-x: hidden;
    position: relative;
}

/* ============================================
   背景网格装饰 - 科技感
   ============================================ */
.background-decoration {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
}

/* 网格背景 - 明亮风格 */
.background-decoration::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        linear-gradient(rgba(8, 145, 178, 0.06) 1px, transparent 1px),
        linear-gradient(90deg, rgba(8, 145, 178, 0.06) 1px, transparent 1px);
    background-size: 50px 50px;
}

/* 浮动光点 */
.floating-shape {
    position: absolute;
    width: 4px;
    height: 4px;
    background: var(--tech-cyan);
    border-radius: 50%;
    box-shadow: 0 0 10px var(--tech-cyan), 0 0 20px var(--tech-cyan);
    animation: float-tech 8s ease-in-out infinite;
}

.shape-1 { top: 15%; left: 10%; animation-delay: 0s; }
.shape-2 { top: 25%; right: 15%; animation-delay: 1.5s; background: var(--tech-purple); box-shadow: 0 0 10px var(--tech-purple), 0 0 20px var(--tech-purple); }
.shape-3 { top: 65%; left: 8%; animation-delay: 3s; background: var(--tech-teal); box-shadow: 0 0 10px var(--tech-teal), 0 0 20px var(--tech-teal); }
.shape-4 { top: 75%; right: 12%; animation-delay: 4.5s; }
.shape-5 { top: 45%; left: 5%; animation-delay: 6s; background: var(--tech-blue); box-shadow: 0 0 10px var(--tech-blue), 0 0 20px var(--tech-blue); }
.shape-6 { top: 85%; right: 20%; animation-delay: 7s; background: var(--tech-purple); box-shadow: 0 0 10px var(--tech-purple), 0 0 20px var(--tech-purple); }

@keyframes float-tech {
    0%, 100% {
        transform: translateY(0) scale(1);
        opacity: 0.6;
    }
    50% {
        transform: translateY(-30px) scale(1.2);
        opacity: 1;
    }
}

/* ============================================
   容器布局
   ============================================ */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 60px 30px;
    position: relative;
    z-index: 1;
}

/* ============================================
   头部样式 - 科技感
   ============================================ */
.site-header {
    text-align: center;
    margin-bottom: 60px;
    animation: fadeInDown 0.8s ease-out;
}

.site-title {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 20px;
    font-size: 2.8rem;
    font-weight: 700;
    margin-bottom: 15px;
    letter-spacing: 2px;
}

.title-icon {
    font-size: 2.5rem;
    animation: pulse-glow 2s ease-in-out infinite;
    filter: drop-shadow(0 0 10px var(--glow-cyan));
}

@keyframes pulse-glow {
    0%, 100% {
        filter: drop-shadow(0 0 5px var(--glow-cyan));
        transform: scale(1);
    }
    50% {
        filter: drop-shadow(0 0 20px var(--glow-cyan));
        transform: scale(1.05);
    }
}

.title-text {
    background: linear-gradient(135deg, var(--tech-cyan) 0%, var(--tech-blue) 50%, var(--tech-purple) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: none;
    position: relative;
}

.title-text::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--tech-cyan), transparent);
}

.site-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    font-weight: 400;
    letter-spacing: 3px;
    text-transform: uppercase;
}

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

/* ============================================
   导航区块样式
   ============================================ */
.nav-section {
    margin-bottom: 50px;
    animation: fadeInUp 0.8s ease-out;
}

.nav-section:nth-child(2) { animation-delay: 0.1s; }
.nav-section:nth-child(3) { animation-delay: 0.2s; }
.nav-section:nth-child(4) { animation-delay: 0.3s; }

.section-title {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 25px;
    padding-left: 10px;
    color: var(--text-primary);
    letter-spacing: 1px;
}

.section-icon {
    font-size: 1.4rem;
    filter: drop-shadow(0 0 8px var(--glow-cyan));
}

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

/* ============================================
   导航网格布局 - 每排5个卡片
   ============================================ */
.nav-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 20px;
}

/* ============================================
   科技风卡片样式
   ============================================ */
.nav-card {
    position: relative;
    background: var(--bg-card);
    border-radius: var(--card-radius);
    padding: 30px 20px;
    text-align: center;
    cursor: pointer;
    transition: var(--transition-smooth);
    border: 1px solid rgba(148, 163, 184, 0.2);
    box-shadow: 
        0 4px 6px -1px rgba(0, 0, 0, 0.05),
        0 2px 4px -1px rgba(0, 0, 0, 0.03);
    overflow: hidden;
}

/* 卡片顶部发光条 */
.nav-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--tech-cyan), transparent);
    opacity: 0.5;
    transition: opacity 0.3s ease;
}

/* 卡片角落装饰 */
.nav-card::after {
    content: '';
    position: absolute;
    top: 10px;
    right: 10px;
    width: 6px;
    height: 6px;
    border-top: 2px solid var(--tech-cyan);
    border-right: 2px solid var(--tech-cyan);
    opacity: 0.5;
    transition: var(--transition-smooth);
}

/* 卡片颜色主题 - 明亮科技风 */
.nav-card.pink {
    border-color: rgba(8, 145, 178, 0.15);
}

.nav-card.pink::before {
    background: linear-gradient(90deg, transparent, var(--tech-cyan), transparent);
}

.nav-card.pink::after {
    border-color: var(--tech-cyan);
}

.nav-card.purple {
    border-color: rgba(124, 58, 237, 0.15);
}

.nav-card.purple::before {
    background: linear-gradient(90deg, transparent, var(--tech-purple), transparent);
}

.nav-card.purple::after {
    border-color: var(--tech-purple);
}

.nav-card.blue {
    border-color: rgba(37, 99, 235, 0.15);
}

.nav-card.blue::before {
    background: linear-gradient(90deg, transparent, var(--tech-blue), transparent);
}

.nav-card.blue::after {
    border-color: var(--tech-blue);
}

.nav-card.green {
    border-color: rgba(13, 148, 136, 0.15);
}

.nav-card.green::before {
    background: linear-gradient(90deg, transparent, var(--tech-teal), transparent);
}

.nav-card.green::after {
    border-color: var(--tech-teal);
}

.nav-card.yellow {
    border-color: rgba(5, 150, 105, 0.15);
}

.nav-card.yellow::before {
    background: linear-gradient(90deg, transparent, var(--tech-green), transparent);
}

.nav-card.yellow::after {
    border-color: var(--tech-green);
}

.nav-card.coral {
    border-color: rgba(8, 145, 178, 0.15);
}

.nav-card.coral::before {
    background: linear-gradient(90deg, transparent, var(--tech-cyan), transparent);
}

.nav-card.coral::after {
    border-color: var(--tech-cyan);
}

/* 卡片悬停效果 - 明亮清爽 */
.nav-card:hover {
    transform: translateY(-8px);
    background: #FFFFFF;
    box-shadow: 
        0 20px 40px rgba(0, 0, 0, 0.08),
        0 0 20px rgba(8, 145, 178, 0.1);
}

.nav-card.pink:hover {
    border-color: rgba(8, 145, 178, 0.4);
    box-shadow: 
        0 20px 40px rgba(0, 0, 0, 0.08),
        0 0 20px var(--glow-cyan);
}

.nav-card.purple:hover {
    border-color: rgba(124, 58, 237, 0.4);
    box-shadow: 
        0 20px 40px rgba(0, 0, 0, 0.08),
        0 0 20px var(--glow-purple);
}

.nav-card.blue:hover {
    border-color: rgba(37, 99, 235, 0.4);
    box-shadow: 
        0 20px 40px rgba(0, 0, 0, 0.08),
        0 0 20px var(--glow-blue);
}

.nav-card.green:hover {
    border-color: rgba(13, 148, 136, 0.4);
    box-shadow: 
        0 20px 40px rgba(0, 0, 0, 0.08),
        0 0 20px var(--glow-teal);
}

.nav-card.yellow:hover {
    border-color: rgba(5, 150, 105, 0.4);
    box-shadow: 
        0 20px 40px rgba(0, 0, 0, 0.08),
        0 0 20px rgba(5, 150, 105, 0.15);
}

.nav-card.coral:hover {
    border-color: rgba(8, 145, 178, 0.4);
    box-shadow: 
        0 20px 40px rgba(0, 0, 0, 0.08),
        0 0 20px var(--glow-cyan);
}

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

.nav-card:hover::after {
    opacity: 1;
    width: 10px;
    height: 10px;
}

/* 卡片点击效果 */
.nav-card:active {
    transform: translateY(-4px) scale(0.98);
}

/* 卡片图标 */
.card-icon {
    font-size: 2.5rem;
    margin-bottom: 15px;
    display: block;
    transition: transform 0.3s ease;
    filter: drop-shadow(0 0 10px rgba(0, 212, 255, 0.3));
}

.nav-card:hover .card-icon {
    transform: scale(1.15);
    filter: drop-shadow(0 0 20px rgba(0, 212, 255, 0.5));
}

/* 卡片标题 */
.card-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
    line-height: 1.4;
    letter-spacing: 0.5px;
}

/* 卡片描述 */
.card-desc {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 8px;
    font-weight: 400;
}

/* ============================================
   页脚样式
   ============================================ */
.site-footer {
    text-align: center;
    margin-top: 80px;
    padding: 20px;
    color: var(--text-muted);
    font-size: 0.9rem;
    border-top: 1px solid rgba(148, 163, 184, 0.2);
}

/* ============================================
   响应式设计
   ============================================ */
@media (max-width: 1200px) {
    .nav-grid {
        grid-template-columns: repeat(4, 1fr);
        gap: 18px;
    }
}

@media (max-width: 900px) {
    .nav-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 15px;
    }
    
    .site-title {
        font-size: 2.2rem;
    }
    
    .title-icon {
        font-size: 2rem;
    }
    
    .container {
        padding: 40px 20px;
    }
}

@media (max-width: 600px) {
    .nav-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 12px;
    }
    
    .site-title {
        font-size: 1.8rem;
        flex-wrap: wrap;
        gap: 10px;
    }
    
    .title-icon {
        font-size: 1.6rem;
    }
    
    .nav-card {
        padding: 25px 15px;
    }
    
    .card-icon {
        font-size: 2rem;
    }
    
    .card-title {
        font-size: 0.9rem;
    }
    
    .section-title {
        font-size: 1.1rem;
    }
}

@media (max-width: 350px) {
    .nav-grid {
        grid-template-columns: 1fr;
    }
}

/* ============================================
   特殊动画效果
   ============================================ */
.nav-card {
    animation: cardAppear 0.5s ease-out backwards;
}

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

/* 扫描线效果 */
.nav-card .scan-line {
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(0, 212, 255, 0.1),
        transparent
    );
    transition: left 0.6s ease;
    pointer-events: none;
}

.nav-card:hover .scan-line {
    left: 100%;
}