/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #1a365d;
    --secondary-color: #2c5282;
    --accent-color: #c53030;
    --text-dark: #1a202c;
    --text-light: #718096;
    --white: #ffffff;
    --light-gray: #f7fafc;
    --border-color: #e2e8f0;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.15);
}

body {
    font-family: 'Noto Sans KR', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--white);
}

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

/* Navigation */
.navbar {
    background: var(--white);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 20px;
    height: 70px;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: inherit;
    flex-shrink: 0;
}

.nav-brand-logo {
    width: 35px;
    height: 35px;
    object-fit: contain;
}

.nav-brand-text h1 {
    font-size: 1.2rem;
    color: var(--primary-color);
    font-weight: 700;
    margin: 0;
}

.nav-subtitle {
    font-size: 0.65rem;
    color: var(--text-light);
    text-transform: uppercase;
    letter-spacing: 1px;
    display: none;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 20px;
    align-items: center;
}

.nav-menu li a {
    text-decoration: none;
    color: var(--text-dark);
    font-weight: 500;
    transition: color 0.3s;
    padding: 5px 0;
    font-size: 0.9rem;
}

.nav-menu li a:hover,
.nav-menu li a.active {
    color: var(--primary-color);
}

.dropdown {
    position: relative;
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    background: var(--white);
    min-width: 200px;
    box-shadow: var(--shadow-lg);
    border-radius: 8px;
    padding: 10px 0;
    list-style: none;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all 0.3s;
}

.dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-menu li a {
    display: block;
    padding: 10px 20px;
    color: var(--text-dark);
}

.dropdown-menu li a:hover {
    background: var(--light-gray);
    color: var(--primary-color);
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--primary-color);
}

/* Hero Section */
.hero {
    position: relative;
    height: 600px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: var(--white);
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('https://images.unsplash.com/photo-1504711434969-e33886168f5c?w=1920&h=1080&fit=crop') center/cover;
    opacity: 0.3;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(26, 54, 93, 0.9) 0%, rgba(44, 82, 130, 0.8) 100%);
}

.hero-content {
    position: relative;
    z-index: 1;
    padding: 0 20px;
}

.hero-title {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 20px;
    animation: fadeInUp 1s ease;
}

.hero-subtitle {
    font-size: 1.25rem;
    margin-bottom: 40px;
    opacity: 0.9;
    animation: fadeInUp 1s ease 0.2s backwards;
}

.hero-buttons {
    display: flex;
    gap: 15px;
    justify-content: center;
    animation: fadeInUp 1s ease 0.4s backwards;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 12px 30px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s;
    border: none;
    cursor: pointer;
}

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

.btn-primary:hover {
    background: #9b2c2c;
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

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

.btn-secondary:hover {
    background: var(--light-gray);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.btn-outline {
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
    background: transparent;
}

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

/* Section Styles */
.section {
    padding: 80px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-title {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 15px;
    font-weight: 700;
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--text-light);
}

/* About Section */
.about-section {
    background: var(--light-gray);
}

.about-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.about-card {
    background: var(--white);
    padding: 40px 30px;
    border-radius: 12px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: transform 0.3s, box-shadow 0.3s;
}

.about-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.about-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
}

.about-icon i {
    font-size: 2rem;
    color: var(--white);
}

.about-card h3 {
    font-size: 1.3rem;
    color: var(--primary-color);
    margin-bottom: 15px;
}

.about-card p {
    color: var(--text-light);
    line-height: 1.8;
}

/* Stats Section */
.stats-section {
    background: var(--primary-color);
    color: var(--white);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 40px;
    text-align: center;
}

.stat-number {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 10px;
}

.stat-label {
    font-size: 1.1rem;
    opacity: 0.9;
}

/* President Section */
.president-section {
    background: var(--white);
}

.president-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 50px;
    align-items: center;
}

.president-image {
    text-align: center;
}

.president-placeholder {
    width: 250px;
    height: 250px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto;
}

.president-placeholder i {
    font-size: 5rem;
    color: var(--white);
}

.president-photo {
    width: 250px;
    height: 250px;
    object-fit: contain;
    border-radius: 50%;
    box-shadow: var(--shadow-lg);
    background: var(--light-gray);
}

.president-text h3 {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 10px;
}

.president-text h4 {
    font-size: 1.3rem;
    color: var(--secondary-color);
    margin-bottom: 20px;
}

.president-text p {
    color: var(--text-light);
    margin-bottom: 15px;
    line-height: 1.8;
}

/* Activities Section */
.activities-section {
    background: var(--light-gray);
}

.activities-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.activity-item {
    background: var(--white);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: transform 0.3s, box-shadow 0.3s;
}

.activity-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.activity-image {
    height: 200px;
    overflow: hidden;
}

.activity-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s;
}

.activity-item:hover .activity-image img {
    transform: scale(1.1);
}

.activity-content {
    padding: 25px;
}

.activity-content h3 {
    font-size: 1.3rem;
    color: var(--primary-color);
    margin-bottom: 15px;
}

.activity-content p {
    color: var(--text-light);
    line-height: 1.8;
}

/* CTA Section */
.cta-section {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--white);
    text-align: center;
}

.cta-content h2 {
    font-size: 2.5rem;
    margin-bottom: 15px;
}

.cta-content p {
    font-size: 1.2rem;
    margin-bottom: 30px;
    opacity: 0.9;
}

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

.cta-content .btn-primary:hover {
    background: var(--light-gray);
}

/* Footer */
.footer {
    background: var(--text-dark);
    color: var(--white);
    padding: 60px 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section h3,
.footer-section h4 {
    margin-bottom: 20px;
    color: var(--white);
}

.footer-section p {
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 10px;
    line-height: 1.8;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 10px;
}

.footer-section ul li a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: color 0.3s;
}

.footer-section ul li a:hover {
    color: var(--white);
}

.footer-section i {
    margin-right: 10px;
    color: var(--accent-color);
}

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom p {
    color: rgba(255, 255, 255, 0.5);
}

/* Page Content Styles */
.page-content {
    padding: 80px 0;
    min-height: 60vh;
}

.page-header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--white);
    padding: 60px 0;
    text-align: center;
}

.page-header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
}

.page-header p {
    font-size: 1.2rem;
    opacity: 0.9;
}

.content-section {
    max-width: 900px;
    margin: 0 auto;
}

.content-section h2 {
    font-size: 2rem;
    color: var(--primary-color);
    margin: 40px 0 20px;
    padding-bottom: 10px;
    border-bottom: 3px solid var(--accent-color);
}

.content-section h3 {
    font-size: 1.5rem;
    color: var(--secondary-color);
    margin: 30px 0 15px;
}

.content-section p {
    color: var(--text-light);
    line-height: 1.8;
    margin-bottom: 15px;
}

.content-section ul {
    margin: 20px 0;
    padding-left: 30px;
}

.content-section ul li {
    color: var(--text-light);
    line-height: 1.8;
    margin-bottom: 10px;
}

/* Table Styles */
.data-table {
    width: 100%;
    border-collapse: collapse;
    margin: 30px 0;
    box-shadow: var(--shadow);
    border-radius: 8px;
    overflow: hidden;
}

.data-table th,
.data-table td {
    padding: 15px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.data-table th {
    background: var(--primary-color);
    color: var(--white);
    font-weight: 600;
}

.data-table tr:hover {
    background: var(--light-gray);
}

.data-table tr:nth-child(even) {
    background: var(--light-gray);
}

/* Form Styles */
.form-group {
    margin-bottom: 25px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-dark);
    font-weight: 500;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
}

.form-group textarea {
    min-height: 150px;
    resize: vertical;
}

/* Alert Box */
.alert-box {
    background: #fff5f5;
    border-left: 4px solid var(--accent-color);
    padding: 20px;
    margin: 30px 0;
    border-radius: 4px;
}

.alert-box h3 {
    color: var(--accent-color);
    margin-bottom: 10px;
}

.alert-box p {
    color: var(--text-dark);
    line-height: 1.8;
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 70px;
        right: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background: var(--white);
        flex-direction: column;
        padding: 20px;
        gap: 0;
        transition: right 0.3s;
        overflow-y: auto;
    }

    .nav-menu.active {
        right: 0;
    }

    .nav-menu li {
        width: 100%;
    }

    .nav-menu li a {
        display: block;
        padding: 15px 0;
        border-bottom: 1px solid var(--border-color);
    }

    .dropdown-menu {
        position: static;
        box-shadow: none;
        opacity: 1;
        visibility: visible;
        transform: none;
        padding-left: 20px;
        display: none;
    }

    .dropdown.active .dropdown-menu {
        display: block;
    }

    .mobile-menu-btn {
        display: block;
    }

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

    .hero-subtitle {
        font-size: 1rem;
    }

    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }

    .president-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .section-title {
        font-size: 2rem;
    }

    .stat-number {
        font-size: 2.5rem;
    }
}