/* ==================== CSS RESET ==================== */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* ==================== CSS VARIABLES ==================== */
:root {
    /* Colors */
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --accent-gradient: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --warm-gradient: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
    
    --color-primary: #667eea;
    --color-primary-dark: #5568d3;
    --color-secondary: #764ba2;
    --color-accent: #f093fb;
    
    --color-text-primary: #1a202c;
    --color-text-secondary: #4a5568;
    --color-text-muted: #718096;
    
    --color-bg-primary: #ffffff;
    --color-bg-secondary: #f7fafc;
    --color-bg-tertiary: #edf2f7;
    
    --color-border: #e2e8f0;
    --color-border-light: #f1f5f9;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    --spacing-4xl: 6rem;
    
    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-display: 'Outfit', var(--font-primary);
    
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --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);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;
    
    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* ==================== BASE STYLES ==================== */
html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    color: var(--color-text-primary);
    background: var(--color-bg-secondary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ==================== NAVIGATION ==================== */
.navbar {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border-light);
    padding: var(--spacing-md) 0;
}

.nav-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--spacing-xl);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    font-family: var(--font-display);
    font-weight: 700;
    font-size: var(--font-size-lg);
    color: var(--color-text-primary);
}

.nav-links {
    display: flex;
    gap: var(--spacing-xl);
}

.nav-link {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: var(--font-size-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
}

.nav-link:hover {
    color: var(--color-primary);
    background: var(--color-bg-tertiary);
}

.nav-link.active {
    color: var(--color-primary);
    background: var(--color-bg-tertiary);
}

/* ==================== HERO SECTION ==================== */
.hero {
    max-width: 1280px;
    margin: 0 auto;
    padding: var(--spacing-4xl) var(--spacing-xl);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
}

.hero-content {
    animation: fadeInUp 0.8s ease-out;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1) 0%, rgba(118, 75, 162, 0.1) 100%);
    border: 1px solid rgba(102, 126, 234, 0.2);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-primary);
    margin-bottom: var(--spacing-lg);
}

.badge-icon {
    font-size: var(--font-size-lg);
}

.hero-title {
    font-family: var(--font-display);
    font-size: var(--font-size-5xl);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: var(--spacing-lg);
    color: var(--color-text-primary);
}

.gradient-text {
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-description {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: var(--spacing-2xl);
    max-width: 540px;
}

.hero-cta {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

/* ==================== HERO VISUAL ==================== */
.hero-visual {
    position: relative;
    height: 500px;
}

.floating-card {
    position: absolute;
    background: white;
    border-radius: var(--radius-xl);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-xl);
    animation: float 6s ease-in-out infinite;
}

.floating-card.card-1 {
    top: 20%;
    left: 10%;
    width: 280px;
    animation-delay: 0s;
}

.floating-card.card-2 {
    top: 50%;
    right: 10%;
    width: 240px;
    animation-delay: 1s;
}

.floating-card.card-3 {
    bottom: 15%;
    left: 25%;
    width: 260px;
    animation-delay: 2s;
}

.card-header {
    font-weight: 600;
    font-size: var(--font-size-sm);
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
}

.skeleton-line {
    height: 12px;
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    border-radius: var(--radius-sm);
    margin-bottom: var(--spacing-sm);
    animation: shimmer 2s infinite;
}

.skeleton-line.short {
    width: 60%;
}

.skeleton-box {
    height: 80px;
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    border-radius: var(--radius-md);
    animation: shimmer 2s infinite;
}

/* ==================== BUTTONS ==================== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    font-family: var(--font-primary);
    font-size: var(--font-size-base);
    font-weight: 600;
    text-decoration: none;
    border: none;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-base);
    white-space: nowrap;
}

.btn-primary {
    background: var(--primary-gradient);
    color: white;
    box-shadow: var(--shadow-md);
}

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

.btn-primary:active {
    transform: translateY(0);
}

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

.btn-secondary:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

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

.btn-outline:hover {
    background: var(--color-bg-tertiary);
    border-color: var(--color-primary);
}

.btn-large {
    padding: var(--spacing-lg) var(--spacing-2xl);
    font-size: var(--font-size-lg);
}

/* ==================== SECTIONS ==================== */
.features, .generator-section, .preview-section {
    max-width: 1280px;
    margin: 0 auto;
    padding: var(--spacing-4xl) var(--spacing-xl);
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
}

.section-title {
    font-family: var(--font-display);
    font-size: var(--font-size-4xl);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--color-text-primary);
}

.section-subtitle {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
}

/* ==================== FEATURES GRID ==================== */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-xl);
}

.feature-card {
    background: white;
    padding: var(--spacing-2xl);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
    border: 1px solid var(--color-border-light);
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.feature-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-lg);
}

.feature-title {
    font-family: var(--font-display);
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--color-text-primary);
}

.feature-description {
    color: var(--color-text-secondary);
    line-height: 1.7;
}

/* ==================== TEMPLATE SELECTOR ==================== */
.template-selector {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-3xl);
}

.template-btn {
    background: white;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    cursor: pointer;
    transition: all var(--transition-base);
    text-align: left;
}

.template-btn:hover {
    border-color: var(--color-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.template-btn.active {
    border-color: var(--color-primary);
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.05) 0%, rgba(118, 75, 162, 0.05) 100%);
    box-shadow: var(--shadow-md);
}

.template-icon {
    font-size: var(--font-size-3xl);
}

.template-info h4 {
    font-weight: 600;
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-xs);
    color: var(--color-text-primary);
}

.template-info p {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

/* ==================== GENERATOR FORM ==================== */
.generator-form {
    background: white;
    border-radius: var(--radius-2xl);
    padding: var(--spacing-3xl);
    box-shadow: var(--shadow-lg);
}

.form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    margin-bottom: var(--spacing-3xl);
}

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

.form-section-title {
    font-family: var(--font-display);
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-md);
    border-bottom: 2px solid var(--color-border-light);
}

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

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
}

.form-group label {
    font-weight: 500;
    font-size: var(--font-size-sm);
    color: var(--color-text-primary);
}

.form-group input[type="text"],
.form-group input[type="email"],
.form-group select,
.form-group textarea {
    padding: var(--spacing-md);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    font-family: var(--font-primary);
    font-size: var(--font-size-base);
    color: var(--color-text-primary);
    transition: all var(--transition-base);
    background: white;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 80px;
}

/* ==================== UPLOAD AREA ==================== */
.upload-area {
    border: 2px dashed var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-3xl);
    text-align: center;
    background: var(--color-bg-secondary);
    transition: all var(--transition-base);
    cursor: pointer;
}

.upload-area:hover {
    border-color: var(--color-primary);
    background: rgba(102, 126, 234, 0.05);
}

.upload-area.dragover {
    border-color: var(--color-primary);
    background: rgba(102, 126, 234, 0.1);
}

.upload-icon {
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-md);
}

.upload-area h4 {
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-primary);
}

.upload-area p {
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-lg);
}

.uploaded-files {
    margin-top: var(--spacing-lg);
    display: grid;
    gap: var(--spacing-sm);
}

.file-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--color-bg-secondary);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border-light);
}

.file-icon {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
    background: var(--color-bg-tertiary);
    display: flex;
    align-items: center;
    justify-content: center;
}

.file-info {
    flex: 1;
}

.file-name {
    font-weight: 500;
    font-size: var(--font-size-sm);
    color: var(--color-text-primary);
}

.file-size {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
}

.file-remove {
    background: none;
    border: none;
    color: var(--color-text-muted);
    cursor: pointer;
    padding: var(--spacing-sm);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.file-remove:hover {
    color: #f5576c;
    background: rgba(245, 87, 108, 0.1);
}

/* ==================== CHECKBOX GROUP ==================== */
.checkbox-group {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: var(--spacing-md);
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    cursor: pointer;
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

.checkbox-label input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
    accent-color: var(--color-primary);
}

/* ==================== COLOR INPUTS ==================== */
.color-inputs {
    display: flex;
    gap: var(--spacing-md);
}

.color-inputs input[type="color"] {
    width: 60px;
    height: 60px;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
}

.color-inputs input[type="color"]:hover {
    border-color: var(--color-primary);
    transform: scale(1.05);
}

/* ==================== FORM ACTIONS ==================== */
.form-actions {
    display: flex;
    gap: var(--spacing-lg);
    justify-content: center;
    padding-top: var(--spacing-xl);
    border-top: 2px solid var(--color-border-light);
}

/* ==================== PREVIEW SECTION ==================== */
.preview-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-lg);
    background: white;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-sm);
}

.device-selector {
    display: flex;
    gap: var(--spacing-sm);
}

.device-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    background: transparent;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: all var(--transition-base);
}

.device-btn:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.device-btn.active {
    background: var(--primary-gradient);
    border-color: transparent;
    color: white;
}

.export-actions {
    display: flex;
    gap: var(--spacing-md);
}

.preview-frame {
    background: white;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
    height: 800px;
}

.preview-frame iframe {
    width: 100%;
    height: 100%;
    border: none;
}

/* ==================== LOADING OVERLAY ==================== */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(8px);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 9999;
}

.loading-overlay.active {
    display: flex;
}

.loading-content {
    background: white;
    padding: var(--spacing-3xl);
    border-radius: var(--radius-2xl);
    text-align: center;
    max-width: 400px;
    box-shadow: var(--shadow-2xl);
}

.loading-spinner {
    width: 60px;
    height: 60px;
    margin: 0 auto var(--spacing-xl);
    border: 4px solid var(--color-border-light);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

.loading-content h3 {
    font-family: var(--font-display);
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-md);
}

.loading-content p {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xl);
}

.loading-progress {
    width: 100%;
    height: 6px;
    background: var(--color-border-light);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    background: var(--primary-gradient);
    border-radius: var(--radius-full);
    width: 0%;
    transition: width var(--transition-slow);
}

/* ==================== FOOTER ==================== */
.footer {
    background: var(--color-text-primary);
    color: white;
    padding: var(--spacing-3xl) 0 var(--spacing-xl);
    margin-top: var(--spacing-4xl);
}

.footer-content {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--spacing-xl);
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-3xl);
    margin-bottom: var(--spacing-2xl);
}

.footer-section h4 {
    font-family: var(--font-display);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

.footer-section p {
    color: rgba(255, 255, 255, 0.7);
    font-size: var(--font-size-sm);
}

.footer-section a {
    display: block;
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-sm);
    transition: color var(--transition-base);
}

.footer-section a:hover {
    color: white;
}

.footer-bottom {
    max-width: 1280px;
    margin: 0 auto;
    padding: var(--spacing-xl) var(--spacing-xl) 0;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
}

.footer-bottom p {
    color: rgba(255, 255, 255, 0.5);
    font-size: var(--font-size-sm);
}

/* ==================== ANIMATIONS ==================== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes float {
    0%, 100% {
        transform: translateY(0px);
    }
    50% {
        transform: translateY(-20px);
    }
}

@keyframes shimmer {
    0% {
        background-position: -200% 0;
    }
    100% {
        background-position: 200% 0;
    }
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* ==================== RESPONSIVE DESIGN ==================== */
@media (max-width: 1024px) {
    .hero {
        grid-template-columns: 1fr;
        gap: var(--spacing-2xl);
    }
    
    .hero-visual {
        height: 400px;
    }
    
    .form-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-2xl);
    }
}

@media (max-width: 768px) {
    .hero-title {
        font-size: var(--font-size-4xl);
    }
    
    .section-title {
        font-size: var(--font-size-3xl);
    }
    
    .nav-links {
        gap: var(--spacing-md);
    }
    
    .nav-link {
        font-size: var(--font-size-xs);
        padding: var(--spacing-xs) var(--spacing-sm);
    }
    
    .template-selector {
        grid-template-columns: 1fr;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .hero-cta {
        flex-direction: column;
    }
    
    .hero-cta .btn {
        width: 100%;
        justify-content: center;
    }
    
    .preview-controls {
        flex-direction: column;
        gap: var(--spacing-lg);
    }
    
    .device-selector {
        width: 100%;
        justify-content: center;
    }
    
    .export-actions {
        width: 100%;
        flex-wrap: wrap;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: var(--font-size-3xl);
    }
    
    .generator-form {
        padding: var(--spacing-xl);
    }
    
    .checkbox-group {
        grid-template-columns: 1fr;
    }
}