/* ==================== VARIABLES & RESET ==================== */
:root {
    --primary-blue: #0066cc;
    --dark-blue: #003d7a;
    --light-blue: #e6f0ff;
    --lighter-blue: #cce0ff;
    --accent-blue: #0052a3;
    --text-dark: #1a1a1a;
    --text-light: #ffffff;
    --border-color: #b3d9ff;
    --shadow: 0 4px 15px rgba(0, 102, 204, 0.15);
    --transition: all 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #f5f9ff 0%, #e6f0ff 100%);
    color: var(--text-dark);
    line-height: 1.6;
    min-height: 100vh;
}

/* ==================== CONTAINER & LAYOUT ==================== */
.container {
    max-width: 1200px;
    margin: 15px auto;
    padding: 0 20px;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    gap: 20px;
}

/* ==================== HEADER ==================== */
.header {
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--dark-blue) 100%);
    color: var(--text-light);
    padding: 60px 20px;
    text-align: center;
    box-shadow: var(--shadow);
    margin-bottom: 0;
    border-radius: 20px;
}

.header-content h1 {
    font-size: 3.5rem;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
}

.header-content .tagline {
    font-size: 1.2rem;
    opacity: 0.95;
    font-style: italic;
}

/* ==================== NAVBAR ==================== */
.navbar {
    background: linear-gradient(90deg, var(--primary-blue) 0%, var(--accent-blue) 100%);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow);
    border-radius: 15px;
    margin: 15px 20px 0 20px;
}

.nav-links {
    display: flex;
    list-style: none;
    justify-content: center;
    padding: 0 20px;
    flex-wrap: wrap;
}

.nav-link {
    color: var(--text-light);
    text-decoration: none;
    padding: 15px 25px;
    display: block;
    transition: var(--transition);
    border-bottom: 3px solid transparent;
}

.nav-link:hover {
    background-color: rgba(255, 255, 255, 0.1);
    border-bottom-color: var(--text-light);
}

.nav-link.active {
    border-bottom-color: var(--text-light);
    font-weight: bold;
}

/* ==================== MAIN CONTENT ==================== */
.main-content {
    flex: 1;
    padding: 40px 0;
}

/* ==================== HERO SECTION ==================== */
.hero {
    background: linear-gradient(135deg, var(--light-blue) 0%, var(--lighter-blue) 100%);
    padding: 80px 40px;
    border-radius: 15px;
    text-align: center;
    margin-bottom: 60px;
    box-shadow: var(--shadow);
    border-left: 5px solid var(--primary-blue);
}

.hero h2 {
    font-size: 2.5rem;
    color: var(--dark-blue);
    margin-bottom: 20px;
}

.hero p {
    font-size: 1.2rem;
    color: var(--text-dark);
    margin-bottom: 30px;
}

.cta-button {
    display: inline-block;
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--accent-blue) 100%);
    color: var(--text-light);
    padding: 15px 40px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: bold;
    transition: var(--transition);
    box-shadow: 0 4px 15px rgba(0, 102, 204, 0.3);
}

.cta-button:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(0, 102, 204, 0.4);
}

/* ==================== INTERESTS SECTION ==================== */
.interests-preview {
    margin-top: 60px;
}

.interests-preview h2 {
    text-align: center;
    color: var(--dark-blue);
    font-size: 2.2rem;
    margin-bottom: 50px;
    position: relative;
    padding-bottom: 20px;
}

.interests-preview h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-blue) 0%, var(--accent-blue) 100%);
    border-radius: 2px;
}

.interests-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

/* ==================== INTEREST CARDS ==================== */
.interest-card {
    background: var(--text-light);
    border-radius: 15px;
    padding: 40px 30px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: var(--transition);
    border-top: 5px solid var(--primary-blue);
    position: relative;
    overflow: hidden;
}

.interest-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(0, 102, 204, 0.05) 0%, transparent 100%);
    opacity: 0;
    transition: var(--transition);
}

.interest-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 10px 30px rgba(0, 102, 204, 0.25);
}

.interest-card:hover::before {
    opacity: 1;
}

.interest-icon {
    font-size: 3.5rem;
    margin-bottom: 20px;
    display: block;
}

.interest-card h3 {
    color: var(--primary-blue);
    font-size: 1.5rem;
    margin-bottom: 15px;
}

.interest-card p {
    color: #666;
    margin-bottom: 25px;
    font-size: 0.95rem;
}

.link-btn {
    display: inline-block;
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--accent-blue) 100%);
    color: var(--text-light);
    padding: 10px 25px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    font-size: 0.9rem;
}

.link-btn:hover {
    transform: scale(1.05);
}

/* ==================== SECTION PAGE LAYOUT ==================== */
.section-header {
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--dark-blue) 100%);
    color: var(--text-light);
    padding: 50px 40px;
    border-radius: 15px;
    margin-bottom: 40px;
    text-align: center;
}

.section-header h1 {
    font-size: 2.5rem;
    margin-bottom: 15px;
}

.section-header p {
    font-size: 1.1rem;
    opacity: 0.95;
}

.back-button {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background: var(--primary-blue);
    color: var(--text-light);
    padding: 12px 25px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    margin-bottom: 30px;
    box-shadow: var(--shadow);
}

.back-button:hover {
    background: var(--accent-blue);
    transform: translateX(-5px);
}

.back-button::before {
    content: '← ';
}

/* ==================== CONTENT SECTIONS ==================== */
.content-section {
    background: var(--text-light);
    border-radius: 15px;
    padding: 40px;
    margin-bottom: 30px;
    box-shadow: var(--shadow);
    border-left: 5px solid var(--primary-blue);
}

.content-section h2 {
    color: var(--primary-blue);
    font-size: 1.8rem;
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 2px solid var(--lighter-blue);
}

.content-section h3 {
    color: var(--dark-blue);
    font-size: 1.3rem;
    margin-top: 25px;
    margin-bottom: 15px;
}

.content-section ul {
    list-style-position: inside;
    margin-left: 20px;
    line-height: 1.8;
}

.content-section li {
    margin-bottom: 10px;
    color: #333;
}

.content-section p {
    color: #555;
    margin-bottom: 15px;
    text-align: justify;
}

/* ==================== GALLERY ==================== */
.gallery {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 25px;
    margin-top: 30px;
}

.gallery-item {
    border-radius: 15px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    background: var(--light-blue);
    aspect-ratio: 1;
    display: flex;
    align-items: center;
    justify-content: center;
}

.gallery-item:hover {
    transform: scale(1.05);
    box-shadow: 0 8px 25px rgba(0, 102, 204, 0.3);
}

.gallery-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.gallery-placeholder {
    color: var(--primary-blue);
    font-size: 3rem;
    text-align: center;
}

/* ==================== FOOTER ==================== */
.footer {
    background: linear-gradient(135deg, var(--dark-blue) 0%, #002d5c 100%);
    color: var(--text-light);
    text-align: center;
    padding: 30px 20px;
    margin-top: auto;
    border-radius: 15px 15px 0 0;
    box-shadow: var(--shadow);
    font-weight: 500;
}

.footer p {
    opacity: 0.95;
}

/* ==================== RESPONSIVE DESIGN ==================== */
@media (max-width: 768px) {
    .header-content h1 {
        font-size: 2.5rem;
    }

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

    .interests-preview h2 {
        font-size: 1.8rem;
    }

    .section-header h1 {
        font-size: 1.8rem;
    }

    .nav-links {
        gap: 0;
    }

    .nav-link {
        padding: 12px 15px;
    }

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

    .hero {
        padding: 50px 20px;
    }

    .content-section {
        padding: 30px 20px;
    }

    .gallery {
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 10px;
    }

    .header {
        padding: 40px 15px;
    }

    .header-content h1 {
        font-size: 2rem;
    }

    .nav-link {
        padding: 10px 12px;
        font-size: 0.9rem;
    }

    .hero h2 {
        font-size: 1.5rem;
    }

    .section-header h1 {
        font-size: 1.5rem;
    }
}