/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f8f9fa;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
.main-header {
    background: linear-gradient(135deg, #1e3c72 0%, #2a5298 100%);
    color: white;
    padding: 1rem 0;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.main-header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo h1 a {
    color: white;
    text-decoration: none;
    font-size: 1.5rem;
    font-weight: 700;
}

.main-nav ul {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.main-nav a {
    color: white;
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 5px;
    transition: background-color 0.3s ease;
}

.main-nav a:hover,
.main-nav a.active {
    background-color: rgba(255,255,255,0.2);
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.mobile-menu-toggle span {
    width: 25px;
    height: 3px;
    background: white;
    margin: 3px 0;
    transition: 0.3s;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 4rem 0;
    text-align: center;
}

.hero h2 {
    font-size: 3rem;
    margin-bottom: 1rem;
    font-weight: 700;
}

.hero-subtitle {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.search-container {
    display: flex;
    max-width: 600px;
    margin: 0 auto;
    gap: 10px;
}

.search-input {
    flex: 1;
    padding: 1rem;
    border: none;
    border-radius: 10px;
    font-size: 1rem;
    outline: none;
}

.search-btn {
    padding: 1rem 2rem;
    background: #ff6b6b;
    color: white;
    border: none;
    border-radius: 10px;
    font-size: 1rem;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.search-btn:hover {
    background: #ee5a5a;
}

/* How It Works Section */
.how-it-works {
    padding: 4rem 0;
    background: white;
}

.how-it-works h3 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: #2c3e50;
}

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

.step {
    text-align: center;
    padding: 2rem;
    border-radius: 15px;
    background: #f8f9fa;
    box-shadow: 0 5px 15px rgba(0,0,0,0.08);
}

.step-number {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem;
    font-size: 1.5rem;
    font-weight: bold;
}

.step h4 {
    font-size: 1.3rem;
    margin-bottom: 1rem;
    color: #2c3e50;
}

/* Categories Section */
.categories {
    padding: 4rem 0;
    background: #f8f9fa;
}

.categories h3 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: #2c3e50;
}

.category-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.category-card {
    background: white;
    padding: 2rem;
    border-radius: 15px;
    text-decoration: none;
    color: inherit;
    box-shadow: 0 5px 15px rgba(0,0,0,0.08);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    text-align: center;
}

.category-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0,0,0,0.15);
}

.category-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.category-card h4 {
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
    color: #2c3e50;
}

.category-card p {
    color: #6c757d;
}

/* About Section */
.about {
    padding: 4rem 0;
    background: white;
}

.about h3 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 2rem;
    color: #2c3e50;
}

.about > .container > p {
    text-align: center;
    font-size: 1.1rem;
    margin-bottom: 3rem;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
    color: #6c757d;
}

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

.feature {
    text-align: center;
    padding: 2rem;
}

.feature h4 {
    font-size: 1.3rem;
    margin-bottom: 1rem;
    color: #2c3e50;
}

.feature p {
    color: #6c757d;
}

/* Footer */
footer {
    background: #2c3e50;
    color: white;
    padding: 2rem 0;
    text-align: center;
}

footer p {
    margin-bottom: 0.5rem;
}

/* Utility Classes */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid #f3f3f3;
    border-top: 3px solid #3498db;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

.error {
    background: #f8d7da;
    color: #721c24;
    padding: 1rem;
    border-radius: 5px;
    margin: 1rem 0;
}

.success {
    background: #d4edda;
    color: #155724;
    padding: 1rem;
    border-radius: 5px;
    margin: 1rem 0;
}

/* Card List Styles */
.card-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 1rem;
    margin: 2rem 0;
}

.card-item {
    background: white;
    border-radius: 10px;
    padding: 1rem;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    cursor: pointer;
    transition: transform 0.2s ease;
}

.card-item:hover {
    transform: translateY(-2px);
}

.card-details {
    margin-top: 1rem;
    padding: 1rem;
    background: #f8f9fa;
    border-radius: 5px;
    display: none;
}

.card-details.expanded {
    display: block;
}

.grade-data {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
    gap: 1rem;
    margin: 1rem 0;
}

.grade-item {
    text-align: center;
    padding: 0.5rem;
    background: white;
    border-radius: 5px;
    border: 2px solid #dee2e6;
}

.grade-number {
    font-weight: bold;
    font-size: 1.2rem;
    color: #2c3e50;
}

.grade-population {
    color: #6c757d;
    font-size: 0.9rem;
}

.grade-value {
    color: #28a745;
    font-weight: bold;
}

/* Loading Overlay Styles */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.9);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 10000;
}

.loading-content {
    text-align: center;
    color: #2c3e50;
}

.loading-content .loading {
    width: 50px;
    height: 50px;
    border-width: 4px;
    margin: 0 auto 1rem;
}

.loading-content p {
    font-size: 1.1rem;
    margin: 0;
}

/* Toast Animations */
@keyframes slideInRight {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

@keyframes slideOutRight {
    from {
        transform: translateX(0);
        opacity: 1;
    }
    to {
        transform: translateX(100%);
        opacity: 0;
    }
}