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

:root {
    --primary-color: #4CAF50;
    --secondary-color: #2196F3;
    --accent-color: #FF9800;
    --text-dark: #333;
    --text-light: #666;
    --text-gray: #999;
    --bg-light: #f8f9fa;
    --bg-white: #ffffff;
    --border-color: #e0e0e0;
    --shadow: 0 2px 10px rgba(0,0,0,0.1);
    --shadow-hover: 0 4px 20px rgba(0,0,0,0.15);
}

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

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

/* ========================================
   Header
======================================== */
.header {
    background: var(--bg-white);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0;
}

.logo h1 {
    font-size: 1.5rem;
    color: var(--primary-color);
    font-weight: 700;
    margin-bottom: 5px;
}

.logo-sub {
    font-size: 0.85rem;
    color: var(--text-light);
    font-weight: 400;
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-dark);
    cursor: pointer;
}

.nav-list {
    display: flex;
    list-style: none;
    gap: 30px;
}

.nav-list a {
    text-decoration: none;
    color: var(--text-dark);
    font-weight: 500;
    font-size: 0.95rem;
    transition: color 0.3s;
    padding: 5px 0;
    border-bottom: 2px solid transparent;
}

.nav-list a:hover,
.nav-list a.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

/* ========================================
   Hero Section
======================================== */
.hero {
    position: relative;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 120px 0;
    text-align: center;
    overflow: hidden;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1200 600"><rect fill="none" width="1200" height="600"/><g fill="rgba(255,255,255,0.05)"><circle cx="100" cy="100" r="50"/><circle cx="300" cy="200" r="80"/><circle cx="500" cy="150" r="60"/><circle cx="700" cy="250" r="70"/><circle cx="900" cy="180" r="55"/><circle cx="1100" cy="220" r="65"/></g></svg>');
    background-size: cover;
    opacity: 0.3;
}

.hero-content {
    position: relative;
    z-index: 1;
}

.hero-title {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 20px;
    line-height: 1.3;
}

.hero-subtitle {
    font-size: 1.3rem;
    margin-bottom: 40px;
    opacity: 0.95;
}

.hero-buttons {
    display: flex;
    gap: 15px;
    justify-content: center;
    flex-wrap: wrap;
}

/* ========================================
   Buttons
======================================== */
.btn {
    display: inline-block;
    padding: 12px 30px;
    border-radius: 25px;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s;
    border: 2px solid transparent;
    cursor: pointer;
    font-size: 1rem;
}

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

.btn-primary:hover {
    background: #45a049;
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
}

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

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

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

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

.btn-danger {
    background: #f44336;
    color: white;
    border-color: #f44336;
}

.btn-danger:hover {
    background: #d32f2f;
}

/* ========================================
   Quick Info Cards
======================================== */
.quick-info {
    padding: 80px 0;
    background: var(--bg-light);
}

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

.quick-card {
    background: white;
    padding: 40px 30px;
    border-radius: 10px;
    box-shadow: var(--shadow);
    text-align: center;
    transition: transform 0.3s, box-shadow 0.3s;
}

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

.quick-icon {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.quick-card h3 {
    font-size: 1.4rem;
    margin-bottom: 15px;
    color: var(--text-dark);
}

.quick-card p {
    color: var(--text-light);
    margin-bottom: 20px;
    line-height: 1.6;
}

.quick-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
}

.quick-link:hover {
    color: var(--secondary-color);
}

/* ========================================
   Section Title
======================================== */
.section-title {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 40px;
    text-align: center;
    color: var(--text-dark);
    position: relative;
    padding-bottom: 15px;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: var(--primary-color);
}

/* ========================================
   Main Business
======================================== */
.main-business {
    padding: 80px 0;
}

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

.business-desc {
    text-align: center;
    color: var(--text-light);
    margin-bottom: 20px;
    font-size: 1.05rem;
    line-height: 1.8;
}

.business-items {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    margin: 50px 0;
}

.business-item {
    text-align: center;
    padding: 30px;
    background: var(--bg-light);
    border-radius: 10px;
    transition: transform 0.3s;
}

.business-item:hover {
    transform: translateY(-5px);
}

.business-item i {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.business-item h4 {
    font-size: 1.2rem;
    margin-bottom: 10px;
    color: var(--text-dark);
}

.business-item p {
    color: var(--text-light);
    font-size: 0.95rem;
}

.business-more {
    text-align: center;
    margin-top: 40px;
}

/* ========================================
   Transparency
======================================== */
.transparency {
    padding: 80px 0;
    background: var(--bg-light);
}

.transparency-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-bottom: 50px;
}

.transparency-card {
    background: white;
    padding: 40px;
    border-radius: 10px;
    box-shadow: var(--shadow);
    text-align: center;
}

.transparency-icon {
    font-size: 3.5rem;
    color: var(--primary-color);
    margin-bottom: 25px;
}

.transparency-card h3 {
    font-size: 1.4rem;
    margin-bottom: 15px;
    color: var(--text-dark);
}

.transparency-card p {
    color: var(--text-light);
    margin-bottom: 25px;
    line-height: 1.6;
}

.transparency-notice {
    background: white;
    padding: 30px;
    border-radius: 10px;
    border-left: 4px solid var(--primary-color);
    box-shadow: var(--shadow);
}

.transparency-notice i {
    color: var(--primary-color);
    font-size: 1.5rem;
    margin-right: 10px;
}

.transparency-notice p {
    margin: 10px 0;
    color: var(--text-light);
}

.transparency-notice strong {
    color: var(--text-dark);
}

/* ========================================
   Gallery
======================================== */
.gallery {
    padding: 80px 0;
}

.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
}

.gallery-item {
    position: relative;
    overflow: hidden;
    border-radius: 10px;
    aspect-ratio: 4/3;
    cursor: pointer;
}

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

.gallery-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(transparent, rgba(0,0,0,0.8));
    color: white;
    padding: 20px;
    transform: translateY(100%);
    transition: transform 0.3s;
}

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

.gallery-item:hover .gallery-overlay {
    transform: translateY(0);
}

.gallery-overlay h4 {
    font-size: 1.1rem;
    margin-bottom: 5px;
}

.gallery-overlay p {
    font-size: 0.9rem;
    opacity: 0.9;
}

/* ========================================
   News Section
======================================== */
.news {
    padding: 80px 0;
    background: var(--bg-light);
}

.news-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
}

.news-section {
    background: white;
    padding: 30px;
    border-radius: 10px;
    box-shadow: var(--shadow);
}

.news-list {
    list-style: none;
    margin-bottom: 20px;
}

.news-list li {
    padding: 15px 0;
    border-bottom: 1px solid var(--border-color);
}

.news-list li:last-child {
    border-bottom: none;
}

.news-list a {
    text-decoration: none;
    color: var(--text-dark);
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: color 0.3s;
}

.news-list a:hover {
    color: var(--primary-color);
}

.news-title {
    flex: 1;
    font-weight: 500;
}

.news-date {
    font-size: 0.85rem;
    color: var(--text-gray);
    margin-left: 15px;
}

.news-more {
    text-align: center;
}

.loading {
    text-align: center;
    color: var(--text-gray);
    padding: 30px 0;
}

/* ========================================
   Footer
======================================== */
.footer {
    background: #2c3e50;
    color: white;
    padding: 60px 0 30px;
}

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

.footer-section h3 {
    font-size: 1.3rem;
    margin-bottom: 15px;
}

.footer-section h4 {
    font-size: 1.1rem;
    margin-bottom: 15px;
}

.footer-section p {
    margin-bottom: 10px;
    opacity: 0.9;
}

.footer-desc {
    font-size: 0.95rem;
    opacity: 0.8;
}

.footer-links {
    list-style: none;
}

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

.footer-links a {
    color: white;
    text-decoration: none;
    opacity: 0.8;
    transition: opacity 0.3s;
}

.footer-links a:hover {
    opacity: 1;
}

.footer-section i {
    margin-right: 8px;
    color: var(--primary-color);
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255,255,255,0.1);
}

.footer-bottom p {
    margin: 5px 0;
    font-size: 0.9rem;
    opacity: 0.7;
}

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

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

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

/* ========================================
   Content Section
======================================== */
.content-section {
    padding: 60px 0;
}

.content-box {
    background: white;
    padding: 40px;
    border-radius: 10px;
    box-shadow: var(--shadow);
    margin-bottom: 30px;
}

.content-box h2 {
    font-size: 1.8rem;
    margin-bottom: 20px;
    color: var(--text-dark);
}

.content-box h3 {
    font-size: 1.4rem;
    margin: 30px 0 15px;
    color: var(--text-dark);
}

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

.content-box ul {
    margin: 15px 0 15px 20px;
    color: var(--text-light);
}

.content-box li {
    margin-bottom: 10px;
    line-height: 1.6;
}

/* ========================================
   Table
======================================== */
.table-responsive {
    overflow-x: auto;
    margin: 20px 0;
}

table {
    width: 100%;
    border-collapse: collapse;
    background: white;
}

table th,
table td {
    padding: 12px 15px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

table th {
    background: var(--bg-light);
    font-weight: 600;
    color: var(--text-dark);
}

table tr:hover {
    background: var(--bg-light);
}

/* ========================================
   Form
======================================== */
.form-group {
    margin-bottom: 20px;
}

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

.form-control {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    font-size: 1rem;
    font-family: inherit;
    transition: border-color 0.3s;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
}

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

/* ========================================
   Alert
======================================== */
.alert {
    padding: 15px 20px;
    border-radius: 5px;
    margin-bottom: 20px;
}

.alert-info {
    background: #e3f2fd;
    border-left: 4px solid #2196F3;
    color: #1976d2;
}

.alert-success {
    background: #e8f5e9;
    border-left: 4px solid #4CAF50;
    color: #388e3c;
}

.alert-warning {
    background: #fff3e0;
    border-left: 4px solid #FF9800;
    color: #f57c00;
}

/* ========================================
   Download Button
======================================== */
.download-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    background: var(--primary-color);
    color: white;
    text-decoration: none;
    border-radius: 5px;
    font-weight: 500;
    transition: background 0.3s;
}

.download-btn:hover {
    background: #45a049;
}

.download-btn i {
    font-size: 1.1rem;
}

/* ========================================
   Tab Navigation
======================================== */
.tab-nav {
    display: flex;
    gap: 10px;
    margin-bottom: 30px;
    border-bottom: 2px solid var(--border-color);
    flex-wrap: wrap;
}

.tab-btn {
    padding: 12px 25px;
    background: none;
    border: none;
    color: var(--text-light);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s;
    border-bottom: 3px solid transparent;
    margin-bottom: -2px;
}

.tab-btn:hover {
    color: var(--primary-color);
}

.tab-btn.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

/* ========================================
   Responsive Design
======================================== */
@media (max-width: 768px) {
    .nav-toggle {
        display: block;
    }

    .nav-list {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: 20px;
        box-shadow: var(--shadow);
        display: none;
        gap: 10px;
    }

    .nav-list.active {
        display: flex;
    }

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

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

    .section-title {
        font-size: 1.6rem;
    }

    .quick-cards,
    .business-items,
    .transparency-cards,
    .gallery-grid {
        grid-template-columns: 1fr;
    }

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

    .content-box {
        padding: 25px 20px;
    }

    table {
        font-size: 0.9rem;
    }

    table th,
    table td {
        padding: 8px 10px;
    }
}

@media (max-width: 480px) {
    .hero {
        padding: 80px 0;
    }

    .hero-title {
        font-size: 1.6rem;
    }

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

    .btn {
        width: 100%;
    }
}