@layer base, layout, components, utilities;

@layer base {
    :root {
        --primary: oklch(0.6 0.15 250);
        --primary-light: oklch(0.9 0.05 250);
        --bg-color: oklch(0.98 0.01 250);
        --text-main: oklch(0.2 0.02 250);
        --text-muted: oklch(0.5 0.02 250);
        --white: #ffffff;
        --card-shadow: 0 10px 25px -5px oklch(0 0 0 / 0.1), 0 8px 10px -6px oklch(0 0 0 / 0.1);
        --card-hover-shadow: 0 20px 25px -5px oklch(0 0 0 / 0.15), 0 10px 10px -5px oklch(0 0 0 / 0.1);
        --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }

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

    body {
        font-family: 'Pretendard', sans-serif;
        background-color: var(--bg-color);
        color: var(--text-main);
        line-height: 1.6;
        word-break: keep-all;
        background-image: 
            radial-gradient(at 0% 0%, oklch(0.95 0.02 200) 0, transparent 50%), 
            radial-gradient(at 100% 100%, oklch(0.95 0.02 300) 0, transparent 50%);
        min-height: 100vh;
        display: flex;
        flex-direction: column;
    }
}

@layer layout {
    .container {
        width: 100%;
        max-width: 1200px;
        margin: 0 auto;
        padding: 0 2rem;
    }

    header {
        padding: 4rem 0 3rem;
        text-align: center;
    }

    header h1 {
        font-size: clamp(2rem, 5vw, 3rem);
        font-weight: 800;
        margin-bottom: 1rem;
        letter-spacing: -0.02em;
    }

    header h1 span {
        color: var(--primary);
        display: block;
    }

    header p {
        color: var(--text-muted);
        font-size: 1.2rem;
        font-weight: 500;
    }

    main {
        flex: 1;
        padding-bottom: 4rem;
    }

    footer {
        padding: 2rem 0;
        text-align: center;
        border-top: 1px solid oklch(0 0 0 / 0.05);
        color: var(--text-muted);
        font-size: 0.9rem;
    }

    .grid-layout {
        display: grid;
        grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
        gap: 2rem;
        perspective: 1000px;
    }
}

@layer components {
    .subject-card {
        background: var(--white);
        border-radius: 24px;
        padding: 2.5rem 2rem;
        text-decoration: none;
        color: inherit;
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        text-align: center;
        box-shadow: var(--card-shadow);
        transition: var(--transition);
        border: 1px solid oklch(1 0 0 / 0.5);
        position: relative;
        overflow: hidden;
        cursor: pointer;
    }

    .subject-card:hover {
        transform: translateY(-8px) scale(1.02);
        box-shadow: var(--card-hover-shadow);
        border-color: var(--primary);
    }

    .subject-card .icon {
        font-size: 3.5rem;
        margin-bottom: 1.5rem;
        background: var(--primary-light);
        width: 100px;
        height: 100px;
        display: flex;
        align-items: center;
        justify-content: center;
        border-radius: 50%;
        transition: var(--transition);
    }

    .subject-card:hover .icon {
        background: var(--primary);
        transform: rotate(10deg);
    }

    .subject-card h3 {
        font-size: 1.5rem;
        font-weight: 700;
        margin-bottom: 0.5rem;
    }

    .subject-card p {
        font-size: 0.95rem;
        color: var(--text-muted);
    }

    /* Form Styles */
    .form-container {
        max-width: 600px;
        margin: 0 auto;
        background: var(--white);
        padding: 3rem;
        border-radius: 24px;
        box-shadow: var(--card-shadow);
    }

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

    .form-group label {
        display: block;
        margin-bottom: 0.5rem;
        font-weight: 600;
        color: var(--text-main);
    }

    .form-group input, 
    .form-group textarea {
        width: 100%;
        padding: 1rem;
        border-radius: 12px;
        border: 2px solid oklch(0.9 0.02 250);
        font-family: inherit;
        font-size: 1rem;
        transition: var(--transition);
    }

    .form-group input:focus, 
    .form-group textarea:focus {
        outline: none;
        border-color: var(--primary);
        box-shadow: 0 0 0 4px var(--primary-light);
    }

    .form-actions {
        display: flex;
        gap: 1rem;
        margin-top: 2rem;
    }

    .btn-primary, .btn-secondary {
        flex: 1;
        padding: 1rem;
        border-radius: 12px;
        font-weight: 700;
        font-size: 1rem;
        cursor: pointer;
        transition: var(--transition);
        text-align: center;
        text-decoration: none;
        border: none;
    }

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

    .btn-primary:hover {
        background: oklch(0.55 0.15 250);
        transform: translateY(-2px);
    }

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

    .btn-secondary:hover {
        background: oklch(0.85 0.05 250);
        transform: translateY(-2px);
    }

    /* Glow Effect */
    .subject-card::after {
        content: '';
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: radial-gradient(circle at center, var(--primary) 0%, transparent 70%);
        opacity: 0;
        transition: var(--transition);
        z-index: -1;
    }

    .subject-card:hover::after {
        opacity: 0.05;
    }
}

@media (max-width: 600px) {
    header {
        padding: 3rem 0 2rem;
    }
    
    .grid-layout {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
}