:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --success-color: #27ae60;
    --danger-color: #e74c3c;
    --warning-color: #f39c12;
    --light-bg: #ecf0f1;
    --border-radius: 8px;
    --transition: all 0.3s ease;
}

* {
    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: #f5f5f5;
}

/* Navigation */
.navbar {
    background-color: var(--primary-color);
    color: white;
    padding: 1rem 0;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 100;
}

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

.logo h1 {
    font-size: 1.8rem;
    color: #3498db;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
    flex-wrap: wrap;
}

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

.nav-links a:hover {
    background-color: var(--secondary-color);
    color: white;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 2rem;
}

/* Pages */
.page {
    display: none;
    animation: fadeIn 0.3s ease;
}

.page.active {
    display: block;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Hero Section */
.hero {
    background: var(--primary-color);
    color: white;
    padding: 4rem 2rem;
    border-radius: var(--border-radius);
    text-align: center;
    margin-bottom: 3rem;
    min-height: 430px;
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero::before {
    content: "";
    position: absolute;
    inset: 0;
    z-index: 1;
    background: linear-gradient(135deg, rgba(44, 62, 80, 0.82), rgba(52, 152, 219, 0.58));
}

.hero-slideshow {
    position: absolute;
    inset: 0;
}

.hero-slideshow img {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0;
    transform: scale(1.05);
    animation: heroPhoto 18s infinite;
}

.hero-slideshow img:nth-child(2) {
    animation-delay: 6s;
}

.hero-slideshow img:nth-child(3) {
    animation-delay: 12s;
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 760px;
}

.hero h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.hero p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
}

@keyframes heroPhoto {
    0% {
        opacity: 0;
        transform: scale(1.05);
    }
    8%,
    30% {
        opacity: 1;
    }
    42%,
    100% {
        opacity: 0;
        transform: scale(1);
    }
}

/* Buttons */
.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 1rem;
    transition: var(--transition);
    text-decoration: none;
    display: inline-block;
}

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

.btn-primary:hover {
    background-color: #2980b9;
    transform: translateY(-2px);
}

.btn-success {
    background-color: var(--success-color);
    color: white;
}

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

.btn-danger {
    background-color: var(--danger-color);
    color: white;
}

/* Cards */
.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin: 3rem 0;
}

.info-card {
    background: white;
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    transition: var(--transition);
}

.info-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.15);
}

.info-card h3 {
    color: var(--secondary-color);
    margin-bottom: 1rem;
}

/* Courses Grid */
.courses-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 2rem;
    margin: 2rem 0;
}

.course-card {
    background: white;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    transition: var(--transition);
}

.course-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.course-card img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    background-color: var(--light-bg);
}

.course-card-content {
    padding: 1.5rem;
}

.course-card h3 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.course-card .teacher {
    color: var(--secondary-color);
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.course-card .level {
    background-color: var(--light-bg);
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: var(--border-radius);
    font-size: 0.85rem;
    color: var(--primary-color);
}

/* Forms */
.form-container {
    background: white;
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    max-width: 500px;
    margin: 0 auto;
}

form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

form h3 {
    color: var(--primary-color);
    margin-top: 1.5rem;
    margin-bottom: 1rem;
}

form input,
form textarea,
form select {
    padding: 0.75rem;
    border: 1px solid #ddd;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-family: inherit;
}

form input:focus,
form textarea:focus,
form select:focus {
    outline: none;
    border-color: var(--secondary-color);
    box-shadow: 0 0 5px rgba(52, 152, 219, 0.3);
}

form textarea {
    resize: vertical;
    min-height: 100px;
}

/* Interactions */
.interactions-list {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    margin-top: 2rem;
}

.interaction-item {
    background: white;
    padding: 1.5rem;
    border-radius: var(--border-radius);
    border-left: 4px solid var(--secondary-color);
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.interaction-item h4 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.interaction-meta {
    font-size: 0.85rem;
    color: #999;
    margin-bottom: 1rem;
}

.interaction-category {
    display: inline-block;
    background-color: var(--light-bg);
    padding: 0.25rem 0.75rem;
    border-radius: var(--border-radius);
    font-size: 0.8rem;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.interaction-replies {
    margin-top: 1rem;
    padding-left: 1.5rem;
    border-left: 2px solid var(--light-bg);
}

.reply {
    background-color: #f9f9f9;
    padding: 0.75rem;
    margin-bottom: 0.5rem;
    border-radius: var(--border-radius);
    font-size: 0.95rem;
}

.reply-author {
    font-weight: bold;
    color: var(--secondary-color);
    font-size: 0.85rem;
}

#newInteractionForm {
    background: white;
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    margin-bottom: 2rem;
}

/* Account */
.account-container {
    background: white;
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.account-info {
    background-color: var(--light-bg);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    margin-bottom: 2rem;
}

.account-info p {
    margin: 0.5rem 0;
}

#submissionsList {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-top: 1rem;
}

.submission-item {
    background-color: var(--light-bg);
    padding: 1rem;
    border-radius: var(--border-radius);
    border-left: 3px solid var(--success-color);
}

.submission-item.pending {
    border-left-color: var(--warning-color);
}

.submission-item.rejected {
    border-left-color: var(--danger-color);
}

.submission-status {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: var(--border-radius);
    font-size: 0.85rem;
    font-weight: bold;
}

.status-pending {
    background-color: var(--warning-color);
    color: white;
}

.status-accepted {
    background-color: var(--success-color);
    color: white;
}

.status-rejected {
    background-color: var(--danger-color);
    color: white;
}

/* Administration */
.admin-dashboard {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.admin-section {
    background: white;
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.admin-section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    margin-bottom: 1rem;
}

.admin-section-header h3 {
    color: var(--primary-color);
}

.admin-filters {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.filter-btn {
    padding: 0.55rem 0.85rem;
    border: 1px solid #d8e1e8;
    border-radius: var(--border-radius);
    background: white;
    color: var(--primary-color);
    cursor: pointer;
    font-family: inherit;
    transition: var(--transition);
}

.filter-btn.active,
.filter-btn:hover {
    background-color: var(--secondary-color);
    border-color: var(--secondary-color);
    color: white;
}

.admin-count {
    min-width: 2rem;
    height: 2rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background-color: var(--secondary-color);
    color: white;
    border-radius: 999px;
    font-weight: bold;
}

.admin-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.admin-item {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 1rem;
    padding: 1rem;
    background-color: var(--light-bg);
    border-left: 4px solid var(--secondary-color);
    border-radius: var(--border-radius);
}

.admin-item h4 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.admin-item p {
    margin: 0.25rem 0;
}

.admin-decision {
    min-width: 220px;
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 0.75rem;
}

.decision-controls {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.decision-controls textarea {
    width: 100%;
    min-height: 74px;
    padding: 0.75rem;
    border: 1px solid #ddd;
    border-radius: var(--border-radius);
    resize: vertical;
    font-family: inherit;
}

.decision-buttons {
    display: flex;
    gap: 0.5rem;
}

.decision-buttons .btn {
    flex: 1;
    padding: 0.65rem 0.75rem;
}

.modal {
    position: fixed;
    inset: 0;
    z-index: 1000;
    align-items: center;
    justify-content: center;
    padding: 1.5rem;
    background: rgba(0, 0, 0, 0.45);
}

.modal-content {
    width: min(620px, 100%);
    max-height: 88vh;
    overflow-y: auto;
    position: relative;
    background: white;
    border-radius: var(--border-radius);
    padding: 2rem;
    box-shadow: 0 16px 45px rgba(0, 0, 0, 0.25);
}

.modal-close {
    position: absolute;
    top: 0.75rem;
    right: 0.75rem;
    width: 2rem;
    height: 2rem;
    border: none;
    border-radius: 50%;
    background-color: var(--light-bg);
    color: var(--primary-color);
    cursor: pointer;
    font-size: 1.4rem;
    line-height: 1;
}

.detail-grid {
    display: grid;
    gap: 0.75rem;
    margin-top: 1rem;
}

.detail-grid p {
    padding: 0.75rem;
    border-radius: var(--border-radius);
    background-color: var(--light-bg);
}

/* About Section */
.about-content {
    background: white;
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.about-content h3 {
    color: var(--primary-color);
    margin-top: 2rem;
    margin-bottom: 1rem;
}

.about-content ul {
    margin-left: 2rem;
    margin-bottom: 1rem;
}

.about-content li {
    margin-bottom: 0.5rem;
}

/* Alert Messages */
.alert {
    padding: 1rem;
    border-radius: var(--border-radius);
    margin-bottom: 1rem;
}

.alert-success {
    background-color: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.alert-error {
    background-color: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.alert-info {
    background-color: #d1ecf1;
    color: #0c5460;
    border: 1px solid #bee5eb;
}

/* Responsive */
@media (max-width: 768px) {
    .navbar-container {
        flex-direction: column;
        gap: 1rem;
    }

    .nav-links {
        flex-direction: column;
        gap: 0.5rem;
    }

    .hero {
        min-height: 360px;
        padding: 3rem 1.25rem;
    }

    .hero h2 {
        font-size: 1.8rem;
    }

    .info-grid {
        grid-template-columns: 1fr;
    }

    .courses-grid {
        grid-template-columns: 1fr;
    }

    .admin-dashboard {
        grid-template-columns: 1fr;
    }

    .admin-item {
        flex-direction: column;
    }

    .admin-decision {
        width: 100%;
        align-items: stretch;
    }

    .form-container {
        margin: 0;
    }
}