@import url('https://cdn.jsdelivr.net/gh/orioncactus/pretendard@v1.3.8/dist/web/static/pretendard.css');

:root {
    --primary-color: #1e293b;
    --secondary-color: #3b82f6;
    --accent-color: #f59e0b;
    --success-color: #10b981;
    --light-bg: #f8fafc;
    --dark-bg: #0f172a;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --gradient-primary: linear-gradient(135deg, #1e293b 0%, #334155 100%);
    --gradient-accent: linear-gradient(135deg, #f59e0b 0%, #f97316 100%);
    --gradient-blue: linear-gradient(135deg, #3b82f6 0%, #1d4ed8 100%);
}

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

body {
    font-family: 'Pretendard', 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
}

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

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-50px);
    }

    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(50px);
    }

    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes float {
    0%, 100% {
        transform: translateY(0px) rotate(0deg);
    }

    50% {
        transform: translateY(-15px) rotate(2deg);
    }
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }

    50% {
        transform: scale(1.05);
    }
}

@keyframes shine {
    0% {
        background-position: -100px;
    }

    40%, 100% {
        background-position: 200px;
    }
}

/* Hero Section */
.hero-section {
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #334155 100%);
    min-height: 100vh;
    padding: 120px 0 80px;
    position: relative;
    overflow: hidden;
    color: white;
}

    .hero-section::before {
        content: '';
        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 0 100 100"><defs><pattern id="grid" width="10" height="10" patternUnits="userSpaceOnUse"><path d="M 10 0 L 0 0 0 10" fill="none" stroke="%23ffffff" stroke-width="0.5" opacity="0.1"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
        opacity: 0.3;
    }

.hero-content {
    position: relative;
    z-index: 2;
}

.hero-text {
    padding-right: 3rem;
}

.hero-title {
    font-size: 4.5rem;
    font-weight: 900;
    margin-bottom: 2rem;
    background: linear-gradient(135deg, #ffffff 0%, #f59e0b 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: slideInLeft 1s ease-out;
    line-height: 1.1;
    letter-spacing: -0.02em;
}

.hero-subtitle {
    font-size: 1.5rem;
    color: #cbd5e1;
    margin-bottom: 3rem;
    line-height: 1.7;
    animation: slideInLeft 1s ease-out 0.3s both;
    font-weight: 400;
}

.hero-logo-container {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100%;
}

.hero-logo {
    max-height: 650px;
    width: auto;
    filter: brightness(0) saturate(100%) invert(0%) sepia(0%) saturate(0%) hue-rotate(0deg) brightness(0%) contrast(100%);
    animation: float 4s ease-in-out infinite;
    transition: all 0.4s ease;
    transform-origin: center;
}

    .hero-logo:hover {
        transform: scale(1.1) rotate(5deg);
        filter: brightness(0) saturate(100%) invert(67%) sepia(83%) saturate(453%) hue-rotate(11deg) brightness(106%) contrast(96%);
    }

.hero-buttons {
    animation: fadeInUp 1s ease-out 0.6s both;
}

.btn-hero {
    background: var(--gradient-accent);
    color: white;
    padding: 1.3rem 3.5rem;
    border-radius: 50px;
    font-weight: 700;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    margin: 0.5rem;
    transition: all 0.3s ease;
    box-shadow: 0 8px 25px rgba(245, 158, 11, 0.3);
    position: relative;
    overflow: hidden;
    font-size: 1.1rem;
}

    .btn-hero::before {
        content: '';
        position: absolute;
        top: 0;
        left: -100px;
        width: 100px;
        height: 100%;
        background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
        animation: shine 2s infinite;
    }

    .btn-hero:hover {
        transform: translateY(-3px);
        box-shadow: 0 15px 35px rgba(245, 158, 11, 0.4);
        color: white;
    }

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

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

/* Education Categories Section */
.categories-section {
    padding: 100px 0;
    background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
    position: relative;
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-title {
    font-size: 3.5rem;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 1rem;
    position: relative;
    letter-spacing: -0.02em;
}

    .section-title::after {
        content: '';
        position: absolute;
        bottom: -10px;
        left: 50%;
        transform: translateX(-50%);
        width: 80px;
        height: 4px;
        background: var(--gradient-accent);
        border-radius: 2px;
    }

.section-subtitle {
    font-size: 1.3rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
    font-weight: 400;
}

.category-card {
    background: white;
    padding: 3rem 2rem;
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    transition: all 0.4s ease;
    height: 100%;
    position: relative;
    overflow: hidden;
    margin-bottom: 2rem;
}

    .category-card::before {
        content: '';
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        height: 4px;
        background: var(--gradient-accent);
    }

    .category-card:hover {
        transform: translateY(-10px) rotateY(5deg);
        box-shadow: 0 25px 50px rgba(0, 0, 0, 0.15);
    }

.category-icon {
    width: 100px;
    height: 100px;
    background: var(--gradient-primary);
    border-radius: 25px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 2rem;
    color: white;
    font-size: 3rem;
    animation: pulse 3s ease-in-out infinite;
    position: relative;
}

    .category-icon::after {
        content: '';
        position: absolute;
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%);
        width: 120px;
        height: 120px;
        border: 2px solid var(--accent-color);
        border-radius: 30px;
        opacity: 0.3;
        animation: pulse 3s ease-in-out infinite reverse;
    }

.category-title {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 1rem;
    text-align: center;
}

.category-description {
    color: var(--text-secondary);
    line-height: 1.8;
    text-align: center;
    margin-bottom: 2rem;
}

.category-features {
    list-style: none;
    padding: 0;
}

    .category-features li {
        padding: 0.5rem 0;
        color: var(--text-secondary);
        display: flex;
        align-items: center;
        gap: 0.75rem;
    }

        .category-features li::before {
            content: '✓';
            color: var(--success-color);
            font-weight: bold;
            background: rgba(16, 185, 129, 0.1);
            border-radius: 50%;
            width: 24px;
            height: 24px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 0.8rem;
        }

/* Books Section */
.books-section {
    padding: 100px 0;
    background: var(--dark-bg);
    color: white;
    position: relative;
}

    .books-section::before {
        content: '';
        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 60 60"><defs><pattern id="books" width="60" height="60" patternUnits="userSpaceOnUse"><rect width="60" height="60" fill="none"/><path d="M15 10 L15 50 L45 50 L45 10 Z" fill="none" stroke="%23f59e0b" stroke-width="1" opacity="0.1"/></pattern></defs><rect width="100%" height="100%" fill="url(%23books)"/></svg>');
        opacity: 0.2;
    }

.book-card {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    padding: 2.5rem 2rem;
    border-radius: 20px;
    transition: all 0.4s ease;
    height: 100%;
    margin-bottom: 2rem;
    position: relative;
    overflow: hidden;
}

    .book-card::before {
        content: '';
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        height: 3px;
        background: var(--gradient-accent);
    }

    .book-card:hover {
        transform: translateY(-8px);
        background: rgba(255, 255, 255, 0.1);
        box-shadow: 0 20px 40px rgba(245, 158, 11, 0.2);
    }

.book-icon {
    font-size: 4rem;
    color: var(--accent-color);
    margin-bottom: 1.5rem;
    text-align: center;
    display: block;
}

.book-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    text-align: center;
}

.book-count {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--accent-color);
    text-align: center;
    margin-bottom: 0.5rem;
    display: block;
}

.book-label {
    text-align: center;
    opacity: 0.8;
}

/* Stats Section */
.stats-section {
    padding: 80px 0;
    background: var(--gradient-blue);
    color: white;
    position: relative;
}

.stat-card {
    text-align: center;
    padding: 2rem;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 15px;
    margin-bottom: 2rem;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
}

    .stat-card:hover {
        transform: translateY(-5px);
        background: rgba(255, 255, 255, 0.15);
    }

.stat-number {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
    display: block;
    color: var(--accent-color);
}

.stat-label {
    font-size: 1.2rem;
    opacity: 0.9;
}

/* Legal Documents Section */
.legal-section {
    padding: 100px 0;
    background: var(--light-bg);
}

.accordion {
    margin-bottom: 1rem;
}

.accordion-item {
    border: none;
    border-radius: 15px !important;
    margin-bottom: 1rem;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
    overflow: hidden;
}

.accordion-header {
    border-radius: 15px !important;
}

.accordion-button {
    background: white;
    border: none;
    padding: 1.5rem 2rem;
    font-weight: 600;
    font-size: 1.1rem;
    color: var(--text-primary);
    border-radius: 15px !important;
    box-shadow: none;
    position: relative;
}

    .accordion-button:not(.collapsed) {
        background: var(--gradient-primary);
        color: white;
        box-shadow: none;
    }

    .accordion-button::after {
        background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='%23333'%3e%3cpath fill-rule='evenodd' d='M1.646 4.646a.5.5 0 0 1 .708 0L8 10.293l5.646-5.647a.5.5 0 0 1 .708.708l-6 6a.5.5 0 0 1-.708 0l-6-6a.5.5 0 0 1 0-.708z'/%3e%3c/svg%3e");
    }

    .accordion-button:not(.collapsed)::after {
        background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='%23ffffff'%3e%3cpath fill-rule='evenodd' d='M1.646 4.646a.5.5 0 0 1 .708 0L8 10.293l5.646-5.647a.5.5 0 0 1 .708.708l-6 6a.5.5 0 0 1-.708 0l-6-6a.5.5 0 0 1 0-.708z'/%3e%3c/svg%3e");
    }

.accordion-body {
    padding: 2rem;
    background: #f8fafc;
    color: var(--text-secondary);
    line-height: 1.8;
}

    .accordion-body h5 {
        color: var(--text-primary);
        margin-bottom: 1rem;
        font-weight: 600;
    }

    .accordion-body ul {
        padding-left: 1.5rem;
        margin-bottom: 1rem;
    }

    .accordion-body li {
        margin-bottom: 0.5rem;
    }

/* Contact Section */
.contact-section {
    padding: 100px 0;
    background: white;
    position: relative;
}

.contact-card {
    background: white;
    padding: 3rem;
    border-radius: 20px;
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.1);
    margin-bottom: 2rem;
    position: relative;
    overflow: hidden;
}

    .contact-card::before {
        content: '';
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        height: 4px;
        background: var(--gradient-accent);
    }

.contact-item {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    margin-bottom: 2rem;
    padding: 1.5rem;
    background: var(--light-bg);
    border-radius: 15px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
    border-left: 4px solid var(--accent-color);
}

    .contact-item:hover {
        transform: translateX(10px);
        box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
    }

.contact-icon {
    width: 60px;
    height: 60px;
    background: var(--gradient-primary);
    border-radius: 15px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.5rem;
    flex-shrink: 0;
}

.form-control {
    border: 2px solid #e2e8f0;
    border-radius: 12px;
    padding: 1rem;
    font-size: 1rem;
    transition: all 0.3s ease;
    background: #f8fafc;
}

    .form-control:focus {
        border-color: var(--accent-color);
        box-shadow: 0 0 0 3px rgba(245, 158, 11, 0.1);
        background: white;
    }

/* Map */
.map-container {
    height: 400px;
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.1);
    border: 4px solid white;
}

    .map-container iframe {
        width: 100%;
        height: 100%;
        border: none;
        filter: saturate(1.2) contrast(1.1);
    }

/* Responsive */
@media (max-width: 768px) {
    .hero-title {
        font-size: 3rem;
    }

    .hero-subtitle {
        font-size: 1.2rem;
    }

    .section-title {
        font-size: 2.5rem;
    }

    .category-card {
        margin-bottom: 2rem;
    }

    .book-card {
        margin-bottom: 2rem;
    }

    .btn-hero {
        padding: 1rem 2rem;
        font-size: 1rem;
    }

    .hero-text {
        padding-right: 0;
        margin-bottom: 3rem;
    }

    .hero-logo {
        max-height: 300px;
    }
}

/* Scroll animations */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s ease;
}

    .reveal.active {
        opacity: 1;
        transform: translateY(0);
    }