/* ============================================
   深圳港AI+创新应用研发项目 - 现代化UI主题
   主色调：蓝灰白 (Blue-Gray-White)
   设计理念：简洁、专业、科技感
   ============================================ */

/* CSS变量定义 - 蓝灰白主题 */
:root {
    /* 主色调 - 蓝色系 */
    --primary-50: #eff6ff;
    --primary-100: #dbeafe;
    --primary-200: #bfdbfe;
    --primary-300: #93c5fd;
    --primary-400: #60a5fa;
    --primary-500: #3b82f6;
    --primary-600: #2563eb;
    --primary-700: #1d4ed8;
    --primary-800: #1e40af;
    --primary-900: #1e3a8a;
    
    /* 灰度色系 */
    --gray-50: #f8fafc;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    --gray-500: #64748b;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1e293b;
    --gray-900: #0f172a;
    
    /* 功能色 */
    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;
    --info: #3b82f6;
    
    /* 主色映射 */
    --primary: var(--primary-600);
    --primary-light: var(--primary-400);
    --primary-dark: var(--primary-800);
    --secondary: var(--gray-600);
    --accent: var(--primary-500);
    
    /* 背景色 */
    --bg-primary: #ffffff;
    --bg-secondary: var(--gray-50);
    --bg-tertiary: var(--gray-100);
    --bg-dark: var(--gray-900);
    
    /* 文字色 */
    --text-primary: var(--gray-900);
    --text-secondary: var(--gray-600);
    --text-tertiary: var(--gray-400);
    --text-inverse: #ffffff;
    
    /* 边框 */
    --border-light: var(--gray-200);
    --border-medium: var(--gray-300);
    --border-dark: var(--gray-400);
    
    /* 阴影 */
    --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px -1px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    --shadow-glow: 0 0 20px rgba(59, 130, 246, 0.3);
    
    /* 圆角 */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;
    
    /* 间距 */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    --space-24: 6rem;
    
    /* 字体 */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    
    /* 过渡 */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;
    --transition-bounce: 500ms cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* ============================================
   基础重置与全局样式
   ============================================ */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-secondary);
    overflow-x: hidden;
}

/* 选择文本样式 */
::selection {
    background-color: var(--primary-200);
    color: var(--primary-900);
}

/* 滚动条样式 */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

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

::-webkit-scrollbar-thumb {
    background: var(--gray-400);
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--gray-500);
}

/* ============================================
   布局容器
   ============================================ */
.container {
    width: 100%;
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--space-6);
}

.container-narrow {
    max-width: 1000px;
}

.container-wide {
    max-width: 1600px;
}

/* ============================================
   头部导航 - 玻璃拟态效果
   ============================================ */
.header-modern {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-light);
    transition: all var(--transition-base);
}

.header-modern.scrolled {
    background: rgba(255, 255, 255, 0.95);
    box-shadow: var(--shadow-md);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

/* Logo样式 */
.logo-modern {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    text-decoration: none;
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--text-primary);
    transition: transform var(--transition-fast);
}

.logo-modern:hover {
    transform: scale(1.02);
}

/* Logo图片样式 - 黄金比例设计 */
.logo-img {
    height: 44px;
    width: auto;
    object-fit: contain;
    display: block;
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary-500), var(--primary-700));
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 800;
    font-size: 0.875rem;
    box-shadow: var(--shadow-glow);
}

.logo-text {
    display: flex;
    flex-direction: column;
}

.logo-text span {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-tertiary);
    letter-spacing: 0.05em;
}

/* 导航菜单 */
.nav-modern {
    display: flex;
    align-items: center;
    gap: var(--space-1);
}

.nav-link {
    position: relative;
    padding: var(--space-2) var(--space-4);
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9375rem;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.nav-link:hover {
    color: var(--primary);
    background-color: var(--primary-50);
}

.nav-link.active {
    color: var(--primary);
    background-color: var(--primary-50);
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: var(--space-4);
    right: var(--space-4);
    height: 2px;
    background: linear-gradient(90deg, var(--primary-500), var(--primary-600));
    border-radius: var(--radius-full);
}

/* ============================================
   Hero区域 - 现代化渐变背景
   ============================================ */
.hero-modern {
    position: relative;
    min-height: 70vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: calc(72px + var(--space-16)) var(--space-6) var(--space-16);
    background: linear-gradient(135deg, 
        var(--gray-900) 0%, 
        var(--gray-800) 25%,
        var(--primary-900) 75%,
        var(--primary-800) 100%
    );
    overflow: hidden;
}

/* 动态背景网格 */
.hero-modern::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
    background-size: 60px 60px;
    animation: gridMove 20s linear infinite;
}

@keyframes gridMove {
    0% { transform: translate(0, 0); }
    100% { transform: translate(60px, 60px); }
}

/* 光晕效果 */
.hero-modern::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(59, 130, 246, 0.15) 0%, transparent 70%);
    transform: translate(-50%, -50%);
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 900px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-full);
    color: rgba(255, 255, 255, 0.9);
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: var(--space-6);
    backdrop-filter: blur(10px);
}

.hero-badge::before {
    content: '';
    width: 8px;
    height: 8px;
    background: var(--success);
    border-radius: var(--radius-full);
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(1.2); }
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 800;
    color: white;
    line-height: 1.1;
    margin-bottom: var(--space-6);
    letter-spacing: -0.02em;
}

.hero-title span {
    background: linear-gradient(135deg, var(--primary-300), var(--primary-100));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: clamp(1.125rem, 2.5vw, 1.5rem);
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: var(--space-10);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.7;
}

.hero-actions {
    display: flex;
    gap: var(--space-4);
    justify-content: center;
    flex-wrap: wrap;
}

/* ============================================
   按钮组件
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-6);
    font-size: 0.9375rem;
    font-weight: 600;
    text-decoration: none;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-500), var(--primary-600));
    color: white;
    box-shadow: 0 4px 14px rgba(59, 130, 246, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(59, 130, 246, 0.5);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.1);
    color: white;
    border: 1px solid rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.2);
    border-color: rgba(255, 255, 255, 0.3);
}

.btn-outline {
    background: transparent;
    color: var(--primary);
    border: 2px solid var(--primary-200);
}

.btn-outline:hover {
    background: var(--primary-50);
    border-color: var(--primary);
}

.btn-lg {
    padding: var(--space-4) var(--space-8);
    font-size: 1rem;
}

/* ============================================
   内容区域
   ============================================ */
.section-modern {
    padding: var(--space-24) 0;
    position: relative;
}

.section-modern.alt {
    background-color: var(--bg-primary);
}

.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto var(--space-16);
}

.section-label {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-1) var(--space-3);
    background: var(--primary-50);
    color: var(--primary-700);
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    border-radius: var(--radius-full);
    margin-bottom: var(--space-4);
}

.section-title {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: var(--space-4);
    line-height: 1.2;
}

.section-description {
    font-size: 1.125rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ============================================
   卡片组件 - 玻璃拟态
   ============================================ */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--space-6);
}

.card-modern {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: var(--space-8);
    border: 1px solid var(--border-light);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.card-modern::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-400), var(--primary-600));
    transform: scaleX(0);
    transition: transform var(--transition-base);
}

.card-modern:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-200);
}

.card-modern:hover::before {
    transform: scaleX(1);
}

.card-icon {
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, var(--primary-50), var(--primary-100));
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--space-5);
    color: var(--primary-600);
}

.card-icon svg {
    width: 28px;
    height: 28px;
}

.card-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--space-3);
}

.card-content {
    color: var(--text-secondary);
    line-height: 1.7;
    font-size: 0.9375rem;
}

.card-content ul {
    list-style: none;
    padding: 0;
}

.card-content li {
    position: relative;
    padding-left: var(--space-5);
    margin-bottom: var(--space-2);
}

.card-content li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.6em;
    width: 6px;
    height: 6px;
    background: var(--primary-400);
    border-radius: var(--radius-full);
}

/* ============================================
   图表容器 - 现代化设计
   ============================================ */
.diagram-section-modern {
    padding: var(--space-16) 0;
}

.diagram-container-modern {
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    padding: var(--space-8);
    margin-bottom: var(--space-8);
    border: 1px solid var(--border-light);
    box-shadow: var(--shadow-lg);
    transition: all var(--transition-base);
}

.diagram-container-modern:hover {
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-200);
}

.diagram-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-6);
    padding-bottom: var(--space-4);
    border-bottom: 1px solid var(--border-light);
}

.diagram-title-modern {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.diagram-title-modern::before {
    content: '';
    width: 4px;
    height: 24px;
    background: linear-gradient(180deg, var(--primary-400), var(--primary-600));
    border-radius: var(--radius-full);
}

.diagram-content-modern {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: var(--space-6);
    min-height: 400px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* SVG图表样式 */
.diagram-svg {
    width: 100%;
    height: auto;
    max-width: 100%;
}

.diagram-node {
    fill: white;
    stroke: var(--primary-300);
    stroke-width: 2;
    rx: 12;
    filter: drop-shadow(0 4px 6px rgba(0, 0, 0, 0.05));
    transition: all var(--transition-fast);
}

.diagram-node:hover {
    stroke: var(--primary-500);
    filter: drop-shadow(0 8px 12px rgba(59, 130, 246, 0.2));
}

.diagram-node-text {
    font-family: var(--font-sans);
    font-size: 13px;
    font-weight: 600;
    fill: var(--text-primary);
    text-anchor: middle;
}

.diagram-subsystem {
    fill: var(--primary-50);
    stroke: var(--primary-200);
    stroke-width: 2;
    stroke-dasharray: 8, 4;
    rx: 16;
}

.diagram-subsystem-text {
    font-family: var(--font-sans);
    font-size: 14px;
    font-weight: 700;
    fill: var(--primary-700);
    text-anchor: middle;
}

.diagram-connector {
    fill: none;
    stroke: var(--gray-300);
    stroke-width: 2;
    stroke-linecap: round;
}

.diagram-arrow {
    fill: var(--gray-400);
}

/* ============================================
   时间轴 - 现代化设计
   ============================================ */
.timeline-modern {
    position: relative;
    max-width: 1000px;
    margin: 0 auto;
}

.timeline-modern::before {
    content: '';
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: 2px;
    height: 100%;
    background: linear-gradient(180deg, var(--primary-300), var(--primary-500), var(--primary-300));
}

.timeline-item-modern {
    position: relative;
    width: 50%;
    padding: var(--space-6);
}

.timeline-item-modern:nth-child(odd) {
    left: 0;
    padding-right: var(--space-12);
    text-align: right;
}

.timeline-item-modern:nth-child(even) {
    left: 50%;
    padding-left: var(--space-12);
}

.timeline-dot {
    position: absolute;
    width: 20px;
    height: 20px;
    background: var(--bg-primary);
    border: 3px solid var(--primary-500);
    border-radius: var(--radius-full);
    top: var(--space-8);
}

.timeline-item-modern:nth-child(odd) .timeline-dot {
    right: -10px;
}

.timeline-item-modern:nth-child(even) .timeline-dot {
    left: -10px;
}

.timeline-content-modern {
    background: var(--bg-primary);
    padding: var(--space-6);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-light);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

.timeline-content-modern:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.timeline-date-modern {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-1) var(--space-3);
    background: var(--primary-50);
    color: var(--primary-700);
    font-size: 0.75rem;
    font-weight: 700;
    border-radius: var(--radius-full);
    margin-bottom: var(--space-3);
}

.timeline-title-modern {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--space-3);
}

/* ============================================
   底部样式
   ============================================ */
.footer-modern {
    background: var(--gray-900);
    color: var(--gray-300);
    padding: var(--space-16) 0 var(--space-8);
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-10);
    margin-bottom: var(--space-10);
}

.footer-section h3 {
    color: white;
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: var(--space-4);
    letter-spacing: 0.05em;
}

.footer-section p,
.footer-section a {
    color: var(--gray-400);
    font-size: 0.9375rem;
    line-height: 1.8;
    text-decoration: none;
    transition: color var(--transition-fast);
}

.footer-section a:hover {
    color: white;
}

.footer-bottom-modern {
    padding-top: var(--space-8);
    border-top: 1px solid var(--gray-800);
    text-align: center;
    font-size: 0.875rem;
    color: var(--gray-500);
}

/* ============================================
   动画效果
   ============================================ */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

.stagger-1 { transition-delay: 0.1s; }
.stagger-2 { transition-delay: 0.2s; }
.stagger-3 { transition-delay: 0.3s; }
.stagger-4 { transition-delay: 0.4s; }

/* ============================================
   响应式设计
   ============================================ */
@media (max-width: 768px) {
    .header-content {
        height: 64px;
    }
    
    .nav-modern {
        display: none;
    }
    
    .hero-modern {
        min-height: 60vh;
        padding: calc(64px + var(--space-10)) var(--space-4) var(--space-10);
    }
    
    .hero-actions {
        flex-direction: column;
        align-items: center;
    }
    
    .section-modern {
        padding: var(--space-12) 0;
    }
    
    .card-grid {
        grid-template-columns: 1fr;
    }
    
    .timeline-modern::before {
        left: 20px;
    }
    
    .timeline-item-modern {
        width: 100%;
        left: 0 !important;
        padding-left: 60px !important;
        padding-right: var(--space-4) !important;
        text-align: left !important;
    }
    
    .timeline-dot {
        left: 10px !important;
        right: auto !important;
    }
    
    .diagram-container-modern {
        padding: var(--space-4);
    }
}

/* ============================================
   工具类
   ============================================ */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mt-0 { margin-top: 0; }
.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mt-8 { margin-top: var(--space-8); }

.mb-0 { margin-bottom: 0; }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); }

.hidden { display: none; }
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}