@layer base, components, utilities;

@layer base {
    :root {
        /* Vibrant Yellow Palette */
        --primary-yellow: oklch(85% 0.18 90);
        --primary-yellow-glow: oklch(85% 0.18 90 / 0.5);
        --dark-bg: oklch(18% 0.02 260);
        --dark-surface: oklch(22% 0.02 260);
        --text-main: oklch(95% 0.01 260);
        --text-dim: oklch(75% 0.01 260);
        --accent-gold: oklch(75% 0.15 80);
        
        --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        --container-padding: 2rem;
        --border-radius: 1.5rem;
    }

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

    body {
        font-family: 'Pretendard', sans-serif;
        background-color: var(--dark-bg);
        color: var(--text-main);
        line-height: 1.6;
        overflow-x: hidden;
        -webkit-font-smoothing: antialiased;
    }

    .noise-overlay {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background-image: url('https://www.transparenttextures.com/patterns/natural-paper.png');
        opacity: 0.05;
        pointer-events: none;
        z-index: 9999;
    }

    .container {
        max-width: 1200px;
        margin: 0 auto;
        padding: 0 var(--container-padding);
    }

    h1, h2, h3 {
        line-height: 1.2;
        font-weight: 800;
    }

    a {
        text-decoration: none;
        color: inherit;
        transition: var(--transition);
    }

    ul {
        list-style: none;
    }
}

@layer components {
    /* Buttons */
    .btn {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        padding: 1rem 2.5rem;
        border-radius: 5rem;
        font-weight: 700;
        font-size: 1.1rem;
        cursor: pointer;
        transition: var(--transition);
        border: none;
    }

    .btn-primary {
        background-color: var(--primary-yellow);
        color: var(--dark-bg);
        box-shadow: 0 10px 30px var(--primary-yellow-glow);
    }

    .btn-primary:hover {
        transform: translateY(-3px);
        box-shadow: 0 15px 40px var(--primary-yellow-glow);
    }

    .btn-secondary {
        background-color: transparent;
        color: var(--text-main);
        border: 1px solid var(--text-dim);
    }

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

    .btn-block {
        width: 100%;
    }

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

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

    .section-header h2 {
        font-size: 3rem;
        margin-bottom: 1rem;
    }

    .section-header p {
        color: var(--text-dim);
        font-size: 1.2rem;
    }

    .highlight {
        color: var(--primary-yellow);
    }

    /* Hero */
    .hero {
        min-height: 100vh;
        display: flex;
        align-items: center;
        padding-top: 120px;
        background: radial-gradient(circle at top right, oklch(30% 0.1 80 / 0.2), transparent);
    }

    .hero-content h1 {
        font-size: 5.5rem;
        margin: 1.5rem 0;
        letter-spacing: -2px;
    }

    .badge {
        display: inline-block;
        padding: 0.5rem 1.2rem;
        background-color: oklch(30% 0.02 260);
        color: var(--primary-yellow);
        border-radius: 2rem;
        font-size: 0.9rem;
        font-weight: 700;
        letter-spacing: 1px;
    }

    .hero .description {
        font-size: 1.5rem;
        color: var(--text-dim);
        margin-bottom: 3rem;
    }

    .hero-btns {
        display: flex;
        gap: 1.5rem;
    }

    /* Why Section */
    .feature-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
        gap: 2rem;
    }

    .feature-card {
        background: var(--dark-surface);
        padding: 3rem;
        border-radius: var(--border-radius);
        border: 1px solid rgba(255, 255, 255, 0.05);
        transition: var(--transition);
    }

    .feature-card:hover {
        background: rgba(255, 215, 0, 0.05);
        border-color: var(--primary-yellow);
        transform: translateY(-5px);
    }

    .f-icon {
        font-size: 2.5rem;
        margin-bottom: 1.5rem;
        display: block;
    }

    .feature-card h3 {
        margin-bottom: 1rem;
        font-size: 1.4rem;
    }

    .feature-card p {
        color: var(--text-dim);
        font-size: 1rem;
    }

    /* Program Steps (Vertical) */
    .program-steps {
        max-width: 800px;
        margin: 0 auto;
        position: relative;
    }

    .step-item {
        display: flex;
        gap: 3rem;
        margin-bottom: 4rem;
        align-items: center;
    }

    .step-num {
        font-size: 4rem;
        font-weight: 900;
        color: rgba(255, 215, 0, 0.2);
        line-height: 1;
        min-width: 100px;
    }

    .step-info h3 {
        font-size: 1.8rem;
        margin-bottom: 0.5rem;
        color: var(--primary-yellow);
    }

    .step-info p {
        font-size: 1.1rem;
        color: var(--text-dim);
    }

    /* Category Showcase */
    .category-showcase {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 1.5rem;
    }

    .show-item {
        aspect-ratio: 4/5;
        background: linear-gradient(to bottom, #333, #111);
        border-radius: var(--border-radius);
        position: relative;
        overflow: hidden;
        display: flex;
        align-items: flex-end;
        padding: 2rem;
    }

    .show-item::before {
        content: '';
        position: absolute;
        inset: 0;
        background: linear-gradient(to top, rgba(0,0,0,0.8), transparent);
    }

    .show-text {
        position: relative;
        z-index: 1;
    }

    .show-text h3 { color: var(--primary-yellow); margin-bottom: 0.5rem; }

    /* Safety Section */
    .safety-box {
        background: linear-gradient(135deg, oklch(25% 0.1 260), oklch(15% 0.05 260));
        padding: 5rem;
        border-radius: 2rem;
        display: flex;
        justify-content: space-between;
        align-items: center;
        border: 1px solid rgba(255, 215, 0, 0.2);
    }

    .safety-list li {
        margin-bottom: 1rem;
        font-size: 1.3rem;
        font-weight: 600;
        padding-left: 2rem;
        position: relative;
    }

    .safety-list li::before {
        content: '✓';
        position: absolute;
        left: 0;
        color: var(--primary-yellow);
    }

    .safety-badge {
        width: 150px;
        height: 150px;
        border: 2px dashed var(--primary-yellow);
        border-radius: 50%;
        display: flex;
        align-items: center;
        justify-content: center;
        text-align: center;
        font-weight: 900;
        color: var(--primary-yellow);
        transform: rotate(-15deg);
    }

    /* Contact Form */
    .contact-card {
        max-width: 600px;
        margin: 0 auto;
        background: var(--dark-surface);
        padding: 4rem;
        border-radius: var(--border-radius);
        box-shadow: 0 30px 60px rgba(0,0,0,0.5);
    }

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

    input, select, textarea {
        width: 100%;
        padding: 1.2rem;
        background: oklch(15% 0.02 260);
        border: 1px solid oklch(30% 0.02 260);
        border-radius: 1rem;
        color: white;
        font-family: inherit;
        font-size: 1rem;
        transition: var(--transition);
    }

    input:focus, select:focus, textarea:focus {
        outline: none;
        border-color: var(--primary-yellow);
        box-shadow: 0 0 15px var(--primary-yellow-glow);
    }
}

@layer utilities {
    @media (max-width: 1024px) {
        .hero-content h1 { font-size: 4rem; }
        .category-showcase { grid-template-columns: repeat(2, 1fr); }
        .safety-box { flex-direction: column; text-align: center; gap: 3rem; }
    }

    @media (max-width: 768px) {
        :root { --container-padding: 1.5rem; }
        section { padding: 4rem 0; }
        .hero-content h1 { font-size: 3rem; }
        .hero-btns { flex-direction: column; }
        .category-showcase { grid-template-columns: 1fr; }
        .contact-card { padding: 2rem; }
        .section-header h2 { font-size: 2rem; }
        .step-item { flex-direction: column; gap: 1rem; text-align: center; }
    }
}