/* ==========================================
   CSS Variables & Design Tokens
   ========================================== */
:root {
    /* Colors */
    --primary-500: #667eea;
    --primary-600: #5a67d8;
    --primary-700: #4c51bf;
    --accent-500: #764ba2;
    --accent-600: #6a42a0;

    --text-primary: #1a202c;
    --text-secondary: #4a5568;
    --text-tertiary: #718096;
    --text-on-dark: #ffffff;

    --bg-primary: #ffffff;
    --bg-secondary: #f7fafc;
    --bg-tertiary: #edf2f7;

    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

    /* Typography */
    --font-korean: 'Noto Sans KR', sans-serif;
    --font-english: 'Inter', sans-serif;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;

    /* Transitions */
    --transition-base: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: all 0.15s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-korean);
    color: var(--text-primary);
    background: linear-gradient(135deg, #f5f7fa 0%, #e9ecef 100%);
    min-height: 100vh;
    line-height: 1.6;
}

/* ==========================================
   Layout Components
   ========================================== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* ==========================================
   Header
   ========================================== */
.header {
    background: linear-gradient(135deg, #1e3a8a 0%, #3b82f6 100%);
    color: var(--text-on-dark);
    padding: var(--spacing-md) 0;
    box-shadow: var(--shadow-lg);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    animation: fadeInDown 0.6s ease-out;
}

.logo-img {
    width: 50px;
    height: 50px;
    object-fit: contain;
    transition: var(--transition-base);
}

.logo-img:hover {
    transform: scale(1.05) rotate(5deg);
}

.logo h1 {
    font-size: 1.75rem;
    font-weight: 700;
    letter-spacing: -0.025em;
}

/* ==========================================
   Main Content
   ========================================== */
.main-content {
    padding: var(--spacing-xl) 0;
    min-height: calc(100vh - 200px);
}

.main-content .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    align-items: start;
}

/* ==========================================
   Preview Section
   ========================================== */
.preview-section {
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-xl);
    position: sticky;
    top: calc(80px + var(--spacing-md));
    animation: fadeInLeft 0.6s ease-out;
}

.preview-section h2 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: #1e3a8a;
}

.card-preview-wrapper {
    background: var(--bg-tertiary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
}

#businessCard {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    transition: var(--transition-base);
}

#businessCard:hover {
    transform: scale(1.02);
    box-shadow: var(--shadow-xl);
}

.download-btn {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    background: linear-gradient(135deg, #1e3a8a 0%, #3b82f6 100%);
    color: var(--text-on-dark);
    border: none;
    border-radius: var(--radius-lg);
    font-size: 1rem;
    font-weight: 600;
    font-family: var(--font-korean);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    box-shadow: var(--shadow-md);
    transition: var(--transition-base);
    position: relative;
    overflow: hidden;
}

.download-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s;
}

.download-btn:hover::before {
    left: 100%;
}

.download-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.download-btn:active {
    transform: translateY(0);
    box-shadow: var(--shadow-md);
}

/* ==========================================
   Form Section
   ========================================== */
.form-section {
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-xl);
    animation: fadeInRight 0.6s ease-out;
}

.form-section h2 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: #1e3a8a;
}

.card-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.form-group label {
    font-weight: 600;
    font-size: 0.875rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.form-group input {
    padding: var(--spacing-sm) var(--spacing-md);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-family: var(--font-korean);
    color: var(--text-primary);
    background: var(--bg-primary);
    transition: var(--transition-base);
    outline: none;
}

.form-group input:focus {
    border-color: var(--primary-500);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.form-group input::placeholder {
    color: var(--text-tertiary);
}

.form-group input:hover {
    border-color: var(--primary-600);
}

/* ==========================================
   Footer
   ========================================== */
.footer {
    background: var(--bg-primary);
    border-top: 1px solid var(--border-color);
    padding: var(--spacing-lg) 0;
    text-align: center;
    color: var(--text-tertiary);
    margin-top: var(--spacing-xl);
}

/* ==========================================
   Animations
   ========================================== */
@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }

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

@keyframes fadeInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }

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

@keyframes fadeInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }

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

/* ==========================================
   Responsive Design
   ========================================== */
@media (max-width: 968px) {
    .main-content .container {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }

    .preview-section {
        position: relative;
        top: 0;
    }

    .logo h1 {
        font-size: 1.25rem;
    }

    #businessCard {
        max-width: 100%;
    }
}

@media (max-width: 640px) {
    :root {
        --spacing-xl: 2rem;
        --spacing-lg: 1.5rem;
    }

    .header {
        padding: var(--spacing-sm) 0;
    }

    .logo h1 {
        font-size: 1.125rem;
    }

    .preview-section,
    .form-section {
        padding: var(--spacing-md);
    }

    .preview-section h2,
    .form-section h2 {
        font-size: 1.25rem;
    }
}