:root {
    --primary: #4A90E2;
    --secondary: #2ECC71;
    --accent: #E74C3C;
    --background: #F5F6FA;
    --text: #2C3E50;
    --shadow: 0 4px 6px rgba(0,0,0,0.1);
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Segoe UI', system-ui, sans-serif;
    line-height: 1.6;
    color: var(--text);
    background: var(--background);
    scroll-behavior: smooth;
}

nav {
    background: rgba(255, 255, 255, 0.95);
    padding: 1rem 2rem;
    box-shadow: var(--shadow);
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
}

.logo {
    display: flex;
    align-items: center;
    gap: 1rem;
    font-weight: bold;
    font-size: 1.2rem;
    transition: var(--transition);
}

.logo:hover {
    transform: scale(1.05);
}

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

.nav-links a {
    text-decoration: none;
    color: var(--text);
    transition: var(--transition);
    padding: 0.5rem 1rem;
    border-radius: 4px;
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary);
    transition: var(--transition);
}

.nav-links a:hover::after {
    width: 100%;
}

header {
    text-align: center;
    padding: 8rem 2rem 6rem;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    margin-top: 0;
    clip-path: polygon(0 0, 100% 0, 100% 85%, 0 100%);
}

h1 {
    font-size: 3.5rem;
    margin-bottom: 1.5rem;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.2);
}

section {
    padding: 6rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
    animation: fadeIn 0.6s ease-out;
}

h2 {
    text-align: center;
    margin-bottom: 3rem;
    color: var(--primary);
    font-size: 2.5rem;
    position: relative;
    padding-bottom: 1rem;
}

h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    height: 3px;
    background: var(--primary);
}

.card {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 6px 12px rgba(0,0,0,0.15);
}

.tech-card, .app-category, .rules-card, .policy-card, .approach-card {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.tech-card:hover, .app-category:hover, .rules-card:hover, .policy-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 6px 12px rgba(0,0,0,0.15);
}

.schedule-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 1rem;
    margin-bottom: 2rem;
}

.schedule-item {
    padding: 1.5rem;
    text-align: center;
    border-radius: 8px;
    font-weight: bold;
    transition: var(--transition);
}

.active {
    background: var(--primary);
    color: white;
}

.active:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow);
}

.weekend {
    background: var(--secondary);
    color: white;
}

.weekend:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow);
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 1rem;
}

th, td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid #eee;
}

th {
    background: var(--primary);
    color: white;
}

tr:hover {
    background: #f8f9fa;
}

footer {
    text-align: center;
    padding: 3rem;
    background: var(--text);
    color: white;
    clip-path: polygon(0 30%, 100% 0, 100% 100%, 0 100%);
    margin-top: 4rem;
}

.approach-card {
    position: relative;
    overflow: hidden;
}

.approach-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(45deg, transparent, rgba(255,255,255,0.1), transparent);
    transform: translateX(-100%);
    transition: 0.6s;
}

.approach-card:hover::before {
    transform: translateX(100%);
}

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

.safety-container {
    background: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

ul {
    list-style-position: inside;
}

.safety-card {
    border-left: 4px solid var(--primary);
    padding-left: 1rem;
    margin-bottom: 1rem;
}

.alert-categories {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.alert-card {
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.alert-card:hover {
    transform: translateY(-5px);
}

.alert-card h4 {
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

.alert-card.red {
    background: linear-gradient(to right bottom, #ff6b6b, #ff8787);
    color: white;
}

.alert-card.orange {
    background: linear-gradient(to right bottom, #ffa94d, #ffc078);
    color: white;
}

.alert-card.yellow {
    background: linear-gradient(to right bottom, #ffd43b, #ffe066);
    color: #343a40;
}

.mobile-nav-toggle {
    display: none;
}

.overlay {
    display: none;
}

@media (max-width: 768px) {
    nav {
        display: none;
    }

    .nav-links {
        display: flex;
        position: fixed;
        bottom: 0;
        left: 0;
        width: 100%;
        background: white;
        padding: 0.5rem;
        box-shadow: 0 -2px 10px rgba(0,0,0,0.1);
        z-index: 1000;
        flex-direction: row;
        justify-content: space-around;
        height: auto;
    }

    .nav-links a {
        display: flex;
        flex-direction: column;
        align-items: center;
        padding: 0.5rem;
        color: var(--text);
        text-decoration: none;
        font-size: 0.8rem;
        border-bottom: none;
    }

    .nav-links a::before {
        content: '';
        font-family: "Material Icons";
        font-size: 1.5rem;
        margin-bottom: 0.2rem;
    }

    .nav-links a[href="#structure"]::before { content: '📅'; }
    .nav-links a[href="#technology"]::before { content: '💻'; }
    .nav-links a[href="#safety"]::before { content: '🔒'; }
    .nav-links a[href="#apps"]::before { content: '📱'; }
    .nav-links a[href="#behavior"]::before { content: '📋'; }
    .nav-links a[href="#teaching"]::before { content: '🎓'; }

    main {
        padding-bottom: 70px;
    }

    footer {
        margin-bottom: 60px;
    }
}

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