* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #1a5f7a;
    --secondary-color: #57837b;
    --accent-color: #c1e1c1;
    --highlight-color: #d4a574;
    --bg-color: #f5f5f0;
    --text-color: #333;
    --text-light: #666;
}

body {
    font-family: 'PingFang SC', 'Microsoft YaHei', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    padding: 60px 20px;
    text-align: center;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
}

.logo {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    background: white;
    padding: 10px;
    margin-bottom: 20px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.hero h1 {
    font-size: 2.2rem;
    margin-bottom: 15px;
    font-weight: 600;
}

.subtitle {
    font-size: 1.1rem;
    margin-bottom: 10px;
    opacity: 0.9;
}

.description {
    font-size: 1rem;
    opacity: 0.85;
}

/* Main Content */
main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 40px 20px;
}

.section-title {
    text-align: center;
    font-size: 1.8rem;
    color: var(--primary-color);
    margin-bottom: 40px;
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 3px;
    background: var(--highlight-color);
    margin: 15px auto 0;
}

/* Timeline */
.timeline-section {
    margin-bottom: 60px;
}

.timeline {
    position: relative;
    padding-left: 30px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    background: linear-gradient(to bottom, var(--primary-color), var(--secondary-color));
    border-radius: 2px;
}

.timeline-item {
    position: relative;
    margin-bottom: 30px;
    padding-left: 30px;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -38px;
    top: 5px;
    width: 16px;
    height: 16px;
    background: var(--primary-color);
    border: 3px solid white;
    border-radius: 50%;
    box-shadow: 0 2px 8px rgba(26, 95, 122, 0.3);
}

.timeline-year {
    font-size: 1.3rem;
    font-weight: bold;
    color: var(--primary-color);
    margin-bottom: 5px;
}

.timeline-content h3 {
    font-size: 1.1rem;
    color: var(--text-color);
    margin-bottom: 5px;
}

.timeline-content p {
    color: var(--text-light);
    font-size: 0.95rem;
}

.timeline-item.highlight .timeline-year {
    color: var(--highlight-color);
}

.timeline-item.highlight::before {
    background: var(--highlight-color);
    box-shadow: 0 2px 8px rgba(212, 165, 116, 0.4);
}

/* Motto Section */
.motto-section {
    margin-bottom: 60px;
}

.motto-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    max-width: 800px;
    margin: 0 auto;
}

.motto-item {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 30px 20px;
    text-align: center;
    font-size: 1.5rem;
    font-weight: bold;
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(26, 95, 122, 0.2);
    transition: transform 0.3s ease;
}

.motto-item:hover {
    transform: translateY(-5px);
}

/* Features Section */
.features-section {
    margin-bottom: 60px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 20px;
    max-width: 900px;
    margin: 0 auto;
}

.feature-card {
    background: white;
    padding: 25px 15px;
    text-align: center;
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--primary-color);
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.feature-card:hover {
    border-color: var(--highlight-color);
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.12);
}

/* Footer */
footer {
    background: var(--primary-color);
    color: white;
    text-align: center;
    padding: 25px;
    font-size: 0.9rem;
}

/* Tablet - iPad */
@media (max-width: 1024px) {
    .hero {
        padding: 50px 30px;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .motto-grid {
        grid-template-columns: repeat(2, 1fr);
        max-width: 400px;
    }

    .features-grid {
        grid-template-columns: repeat(3, 1fr);
        max-width: 500px;
    }
}

/* Mobile */
@media (max-width: 768px) {
    .hero {
        padding: 40px 20px;
    }

    .logo {
        width: 100px;
        height: 100px;
    }

    .hero h1 {
        font-size: 1.6rem;
    }

    .subtitle {
        font-size: 1rem;
    }

    .section-title {
        font-size: 1.5rem;
    }

    .timeline {
        padding-left: 25px;
    }

    .timeline::before {
        left: 0;
    }

    .timeline-item {
        padding-left: 20px;
    }

    .timeline-item::before {
        left: -33px;
        width: 12px;
        height: 12px;
    }

    .timeline-year {
        font-size: 1.1rem;
    }

    .timeline-content h3 {
        font-size: 1rem;
    }

    .motto-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 15px;
        padding: 0 10px;
    }

    .motto-item {
        padding: 20px 15px;
        font-size: 1.2rem;
    }

    .features-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 15px;
        max-width: 350px;
    }

    .feature-card {
        padding: 20px 10px;
        font-size: 1rem;
    }

    main {
        padding: 30px 15px;
    }
}

/* Small Mobile */
@media (max-width: 480px) {
    .hero h1 {
        font-size: 1.4rem;
    }

    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}