* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }
        :root {
            --primary: #2D3748;
            --secondary: #4A5568;
            --accent: #3182CE;
            --light: #EDF2F7;
            --highlight: #E53E3E;
            --symbol: #9F7AEA;
            --connect: #38B2AC;
            --behavior: #48BB78;
        }

        body {
            background-color: #F7FAFC;
            color: var(--primary);
            line-height: 1.6;
            overflow-x: hidden;
        }
        nav {
            position: fixed;
            top: 0;
            width: 100%;
            background-color: rgba(255, 255, 255, 0.95);
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
            z-index: 100;
            padding: 1rem 0;
            transition: all 0.3s ease;
        }

        .nav-container {
            max-width: 1200px;
            margin: 0 auto;
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 0 2rem;
        }

        .logo {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--accent);
        }

        .nav-links {
            display: flex;
            gap: 2rem;
        }

        .nav-links a {
            text-decoration: none;
            color: var(--secondary);
            font-weight: 500;
            transition: color 0.3s ease;
            position: relative;
        }

        .nav-links a::after {
            content: '';
            position: absolute;
            bottom: -5px;
            left: 0;
            width: 0;
            height: 2px;
            background-color: var(--accent);
            transition: width 0.3s ease;
        }

        .nav-links a:hover::after {
            width: 100%;
        }
        .hero {
            height: 100vh;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            text-align: center;
            padding: 0 2rem;
            background: linear-gradient(135deg, #EDF2F7 0%, #F7FAFC 100%);
            position: relative;
            overflow: hidden;
        }

        .hero::before {
            content: '';
            position: absolute;
            width: 200%;
            height: 200%;
            top: -50%;
            left: -50%;
            background: radial-gradient(circle, rgba(49, 130, 206, 0.05) 0%, rgba(255, 255, 255, 0) 70%);
            animation: float 20s infinite linear;
        }

        @keyframes float {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }

        .hero h1 {
            font-size: clamp(2.5rem, 5vw, 4rem);
            margin-bottom: 1rem;
            color: var(--primary);
            opacity: 0;
            transform: translateY(20px);
            animation: fadeUp 1s ease forwards 0.3s;
        }

        .hero p {
            font-size: clamp(1rem, 2vw, 1.25rem);
            color: var(--secondary);
            max-width: 800px;
            margin-bottom: 2rem;
            opacity: 0;
            transform: translateY(20px);
            animation: fadeUp 1s ease forwards 0.6s;
        }

        .scroll-indicator {
            position: absolute;
            bottom: 2rem;
            left: 50%;
            transform: translateX(-50%);
            animation: bounce 2s infinite;
            cursor: pointer;
        }

        @keyframes bounce {
            0%, 20%, 50%, 80%, 100% { transform: translateY(0) translateX(-50%); }
            40% { transform: translateY(-20px) translateX(-50%); }
            60% { transform: translateY(-10px) translateX(-50%); }
        }

        @keyframes fadeUp {
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 5rem 2rem;
        }
        .timeline {
            position: relative;
            max-width: 1000px;
            margin: 0 auto;
        }

        .timeline::after {
            content: '';
            position: absolute;
            width: 4px;
            background-color: var(--light);
            top: 0;
            bottom: 0;
            left: 50%;
            margin-left: -2px;
            border-radius: 4px;
        }

        .era {
            margin-bottom: 8rem;
            position: relative;
            opacity: 0;
            transform: translateY(30px);
            transition: all 0.8s ease;
        }

        .era.visible {
            opacity: 1;
            transform: translateY(0);
        }

        .era-content {
            padding: 2rem;
            background-color: white;
            border-radius: 12px;
            box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.05);
            position: relative;
            width: 45%;
            transition: all 0.3s ease;
        }

        .era-content:hover {
            transform: translateY(-5px);
            box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
        }

        .era:nth-child(odd) .era-content {
            left: 0;
        }

        .era:nth-child(even) .era-content {
            left: 55%;
        }

        .era::before {
            content: '';
            position: absolute;
            width: 20px;
            height: 20px;
            background-color: white;
            border: 4px solid var(--accent);
            border-radius: 50%;
            top: 2rem;
            z-index: 1;
            left: 50%;
            margin-left: -10px;
        }

        .symbol-era::before {
            border-color: var(--symbol);
        }

        .connect-era::before {
            border-color: var(--connect);
        }

        .behavior-era::before {
            border-color: var(--behavior);
        }

        .era h2 {
            font-size: 1.75rem;
            margin-bottom: 1rem;
            color: var(--primary);
        }

        .symbol-era h2 {
            color: var(--symbol);
        }

        .connect-era h2 {
            color: var(--connect);
        }

        .behavior-era h2 {
            color: var(--behavior);
        }

        .era h3 {
            font-size: 1.25rem;
            margin-bottom: 1rem;
            color: var(--secondary);
            font-weight: 500;
        }

        .era p {
            margin-bottom: 1rem;
            color: var(--secondary);
        }

        .era ul {
            margin-left: 1.5rem;
            margin-bottom: 1rem;
            color: var(--secondary);
        }

        .era li {
            margin-bottom: 0.5rem;
        }
        .schools {
            padding: 5rem 0;
        }

        .section-title {
            text-align: center;
            font-size: clamp(1.5rem, 3vw, 2.5rem);
            margin-bottom: 4rem;
            color: var(--primary);
            position: relative;
            display: inline-block;
            left: 50%;
            transform: translateX(-50%);
        }

        .section-title::after {
            content: '';
            position: absolute;
            bottom: -10px;
            left: 50%;
            transform: translateX(-50%);
            width: 60px;
            height: 3px;
            background-color: var(--accent);
            border-radius: 3px;
        }

        .card-container {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 2rem;
            margin-bottom: 5rem;
        }

        .school-card {
            background-color: white;
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.05);
            transition: all 0.3s ease;
            opacity: 0;
            transform: translateY(30px);
        }

        .school-card.visible {
            opacity: 1;
            transform: translateY(0);
        }

        .school-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
        }

        .card-header {
            padding: 2rem;
            color: white;
        }

        .symbol-header {
            background: linear-gradient(135deg, #9F7AEA 0%, #805AD5 100%);
        }

        .connect-header {
            background: linear-gradient(135deg, #38B2AC 0%, #319795 100%);
        }

        .behavior-header {
            background: linear-gradient(135deg, #48BB78 0%, #38A169 100%);
        }

        .card-header h3 {
            font-size: 1.5rem;
            margin-bottom: 0.5rem;
        }

        .card-header p {
            opacity: 0.9;
        }

        .card-body {
            padding: 2rem;
        }

        .card-body h4 {
            font-size: 1.25rem;
            margin-bottom: 1rem;
            color: var(--primary);
        }

        .card-body ul {
            margin-left: 1.5rem;
            margin-bottom: 1.5rem;
        }

        .card-body li {
            margin-bottom: 0.5rem;
            color: var(--secondary);
        }

        /* 关系部分样式 */
        .relationships {
            padding: 5rem 0;
        }

        .relationship-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 2rem;
        }

        .relationship-card {
            background-color: white;
            border-radius: 12px;
            padding: 2rem;
            box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.05);
            opacity: 0;
            transform: translateY(30px);
            transition: all 0.5s ease;
        }

        .relationship-card.visible {
            opacity: 1;
            transform: translateY(0);
        }

        .relationship-card h3 {
            font-size: 1.5rem;
            margin-bottom: 1rem;
            color: var(--accent);
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }

        .relationship-card h3 svg {
            width: 24px;
            height: 24px;
        }

        .relationship-card p {
            color: var(--secondary);
            margin-bottom: 1rem;
        }
        footer {
            background-color: var(--primary);
            color: white;
            padding: 3rem 2rem;
            text-align: center;
        }

        .footer-content {
            max-width: 1200px;
            margin: 0 auto;
        }

        .footer-content p {
            margin-bottom: 1rem;
            opacity: 0.8;
        }
        @media (max-width: 768px) {
            .timeline::after {
                left: 31px;
            }

            .era-content {
                width: 85%;
                left: 60px !important;
            }

            .era::before {
                left: 20px;
            }

            .nav-links {
                display: none;
            }
        }