:root {
    --bg-dark: #0a0a0c;
    --bg-light: #151518;
    --primary: #bb86fc;
    --primary-variant: #3700b3;
    --secondary: #03dac6;
    --text-main: #e1e1e6;
    --text-dim: #a9a9b3;
    --accent: #ff4081;
    --glass: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    --font-main: 'Pretendard', sans-serif;
    --font-heading: 'Orbit', sans-serif;
}

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

body {
    background-color: var(--bg-dark);
    color: var(--text-main);
    font-family: var(--font-main);
    line-height: 1.6;
    overflow-x: hidden;
}

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

/* Navbar */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(10, 10, 12, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--glass-border);
    padding: 1rem 0;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--primary);
    text-decoration: none;
    letter-spacing: 2px;
}

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

.nav-links a {
    text-decoration: none;
    color: var(--text-dim);
    font-weight: 500;
    transition: color 0.3s;
    font-size: 0.9rem;
}

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

/* Hero Section */
.hero {
    height: 100vh;
    background: url('hero_digital_art_1767276064780.png') no-repeat center center/cover;
    display: flex;
    align-items: center;
    position: relative;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, var(--bg-dark) 20%, transparent 100%);
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 700px;
}

.hero h1 {
    font-family: var(--font-heading);
    font-size: 3.5rem;
    line-height: 1.2;
    margin-bottom: 1.5rem;
}

.hero h1 span {
    color: var(--primary);
    text-shadow: 0 0 20px rgba(187, 134, 252, 0.4);
}

.hero p {
    font-size: 1.2rem;
    color: var(--text-dim);
    margin-bottom: 2.5rem;
}

.btn {
    display: inline-block;
    padding: 1rem 2.5rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
}

.btn-primary {
    background: var(--primary);
    color: var(--bg-dark);
    margin-right: 1rem;
    box-shadow: 0 4px 15px rgba(187, 134, 252, 0.3);
}

.btn-primary:hover {
    background: #ce93d8;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(187, 134, 252, 0.5);
}

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

.btn-secondary:hover {
    background: var(--secondary);
    color: var(--bg-dark);
}

/* Sections General */
.section {
    padding: 8rem 0;
}

.section-title {
    font-family: var(--font-heading);
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 4rem;
    letter-spacing: 3px;
    position: relative;
    color: var(--text-main);
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background: var(--primary);
    margin: 1rem auto;
}

.alternate {
    background-color: var(--bg-light);
}

/* Instructors */
.instructor-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.instructor-card {
    background: var(--glass);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    overflow: hidden;
    transition: transform 0.3s ease;
}

.instructor-card:hover {
    transform: translateY(-10px);
    border-color: var(--primary);
}

.instructor-img img {
    width: 100%;
    height: 400px;
    object-fit: cover;
    filter: grayscale(20%);
    transition: filter 0.3s ease;
}

.instructor-card:hover .instructor-img img {
    filter: grayscale(0%);
}

.instructor-info {
    padding: 2rem;
    text-align: center;
}

.instructor-info h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.role {
    color: var(--secondary);
    font-weight: 700;
    margin-bottom: 1rem;
    font-size: 0.9rem;
    text-transform: uppercase;
}

.desc {
    color: var(--text-dim);
    font-size: 0.95rem;
}

.instructor-card.featured {
    grid-column: span 1;
    border: 2px solid var(--primary);
    box-shadow: 0 0 30px rgba(187, 134, 252, 0.2);
}

.instructor-info h3 span {
    font-size: 0.8rem;
    color: var(--text-dim);
    font-weight: 400;
    margin-left: 0.5rem;
}

.course-list {
    display: flex;
    flex-direction: column;
    gap: 6rem;
}

.course-item {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.course-item.reverse {
    direction: rtl;
}

.course-item.reverse .course-text {
    direction: ltr;
}

.course-text h3 {
    font-family: var(--font-heading);
    font-size: 2rem;
    color: var(--secondary);
    margin-bottom: 1.5rem;
}

.course-text p {
    color: var(--text-dim);
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
}

.course-text ul {
    list-style: none;
}

.course-text li {
    padding: 0.5rem 0;
    position: relative;
    padding-left: 1.5rem;
}

.course-text li::before {
    content: '▹';
    position: absolute;
    left: 0;
    color: var(--primary);
}

.course-visual img {
    width: 100%;
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    border: 1px solid var(--glass-border);
}

/* Online Enrollment */
.section-desc {
    text-align: center;
    color: var(--text-dim);
    margin-top: -3rem;
    margin-bottom: 4rem;
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.pricing-card {
    background: var(--glass);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    padding: 3rem;
    text-align: center;
    position: relative;
    transition: all 0.3s ease;
}

.pricing-card:hover {
    transform: translateY(-10px);
    border-color: var(--secondary);
}

.pricing-card.premium {
    border-color: var(--primary);
    background: linear-gradient(180deg, rgba(187, 134, 252, 0.1) 0%, var(--glass) 100%);
}

.ribbon {
    position: absolute;
    top: 10px;
    right: 10px;
    background: var(--accent);
    color: white;
    padding: 0.3rem 1rem;
    border-radius: 5px;
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
}

.card-header h3 {
    font-family: var(--font-heading);
    margin-bottom: 1rem;
    color: var(--primary);
}

.price {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 2rem;
}

.price span {
    font-size: 1rem;
    color: var(--text-dim);
    font-weight: 400;
}

.features {
    list-style: none;
    margin-bottom: 3rem;
    text-align: left;
}

.features li {
    padding: 0.8rem 0;
    border-bottom: 1px solid var(--glass-border);
    font-size: 0.95rem;
}

.buy-btn {
    width: 100%;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(5px);
}

.modal-content {
    background-color: var(--bg-light);
    margin: 10% auto;
    padding: 3rem;
    border: 1px solid var(--glass-border);
    width: 450px;
    border-radius: 20px;
    position: relative;
}

.close-modal {
    position: absolute;
    right: 20px;
    top: 15px;
    font-size: 2rem;
    cursor: pointer;
    color: var(--text-dim);
}

.payment-form {
    margin-top: 2rem;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.8rem;
    color: var(--text-dim);
}

.form-group input {
    width: 100%;
    background: var(--bg-dark);
    border: 1px solid var(--glass-border);
    padding: 0.8rem;
    border-radius: 8px;
    color: white;
}

.form-row {
    display: flex;
    gap: 1rem;
}

.w-100 {
    width: 100%;
}

/* Contact */
.contact-wrapper {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: 4rem;
    background: var(--glass);
    padding: 4rem;
    border-radius: 30px;
    border: 1px solid var(--glass-border);
}

.info-item {
    display: flex;
    align-items: flex-start;
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.info-item .icon {
    font-size: 1.5rem;
    background: rgba(187, 134, 252, 0.1);
    padding: 1rem;
    border-radius: 15px;
}

.contact-cta {
    background: linear-gradient(135deg, var(--primary-variant), #1a1a2e);
    padding: 3rem;
    border-radius: 20px;
    text-align: center;
}

.contact-cta h3 {
    margin-bottom: 1rem;
}

.contact-cta p {
    margin-bottom: 2rem;
    color: var(--text-dim);
}

/* Footer */
.footer {
    padding: 4rem 0;
    border-top: 1px solid var(--glass-border);
    text-align: center;
    color: #666;
}

/* Animations */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 1s forwards;
}

.delay-1 {
    animation-delay: 0.3s;
}

.delay-2 {
    animation-delay: 0.6s;
}

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

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 0 1.5rem;
    }

    .hero h1 {
        font-size: 2.5rem;
    }

    .nav-links {
        display: none;
    }

    .course-item {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .course-item.reverse {
        direction: ltr;
    }

    .contact-wrapper {
        grid-template-columns: 1fr;
        padding: 2rem;
    }
}