/*
=====================================================
Piksel Veri Marketplace - Premium Design System
=====================================================
A comprehensive, modern design system with:
- CSS Custom Properties (variables)
- Dark/Light mode support
- Smooth animations & micro-interactions
- Glassmorphism effects
- Premium typography
- Mobile-first responsive design
*/

/* ===========================================
   1. ROOT VARIABLES & DESIGN TOKENS
   =========================================== */

:root {
    /* Primary Colors */
    --primary-50: #eef2ff;
    --primary-100: #e0e7ff;
    --primary-200: #c7d2fe;
    --primary-300: #a5b4fc;
    --primary-400: #818cf8;
    --primary-500: #6366f1;
    --primary-600: #4f46e5;
    --primary-700: #4338ca;
    --primary-800: #3730a3;
    --primary-900: #312e81;
    
    /* Secondary Colors - Purple */
    --secondary-50: #faf5ff;
    --secondary-100: #f3e8ff;
    --secondary-200: #e9d5ff;
    --secondary-300: #d8b4fe;
    --secondary-400: #c084fc;
    --secondary-500: #a855f7;
    --secondary-600: #9333ea;
    --secondary-700: #7e22ce;
    --secondary-800: #6b21a8;
    --secondary-900: #581c87;
    
    /* Accent Colors - Cyan */
    --accent-400: #22d3ee;
    --accent-500: #06b6d4;
    --accent-600: #0891b2;
    
    /* Success */
    --success-50: #ecfdf5;
    --success-500: #10b981;
    --success-600: #059669;
    
    /* Warning */
    --warning-50: #fffbeb;
    --warning-500: #f59e0b;
    --warning-600: #d97706;
    
    /* Error */
    --error-50: #fef2f2;
    --error-500: #ef4444;
    --error-600: #dc2626;
    
    /* Neutral (Light Mode) */
    --neutral-50: #fafafa;
    --neutral-100: #f5f5f5;
    --neutral-200: #e5e5e5;
    --neutral-300: #d4d4d4;
    --neutral-400: #a3a3a3;
    --neutral-500: #737373;
    --neutral-600: #525252;
    --neutral-700: #404040;
    --neutral-800: #262626;
    --neutral-900: #171717;
    
    /* Semantic Colors */
    --color-bg: #ffffff;
    --color-bg-secondary: #fafafa;
    --color-bg-tertiary: #f5f5f5;
    --color-surface: #ffffff;
    --color-surface-elevated: #ffffff;
    --color-text: #171717;
    --color-text-secondary: #525252;
    --color-text-muted: #737373;
    --color-border: #e5e5e5;
    --color-border-light: #f5f5f5;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-primary-hover: linear-gradient(135deg, #5a67d8 0%, #6b21a8 100%);
    --gradient-hero: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
    --gradient-subtle: linear-gradient(135deg, rgba(102, 126, 234, 0.1) 0%, rgba(118, 75, 162, 0.1) 100%);
    --gradient-glass: linear-gradient(135deg, rgba(255,255,255,0.9) 0%, rgba(255,255,255,0.7) 100%);
    
    /* Shadows */
    --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1), 0 1px 2px 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);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    --shadow-glow: 0 0 40px rgba(99, 102, 241, 0.3);
    --shadow-glow-lg: 0 0 60px rgba(99, 102, 241, 0.4);
    
    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-display: 'Outfit', var(--font-sans);
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    
    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-lg: 1.125rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;
    --text-3xl: 1.875rem;
    --text-4xl: 2.25rem;
    --text-5xl: 3rem;
    --text-6xl: 3.75rem;
    
    --leading-tight: 1.25;
    --leading-normal: 1.5;
    --leading-relaxed: 1.625;
    
    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-3xl: 2rem;
    --radius-full: 9999px;
    
    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 200ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 300ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slower: 500ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-spring: 500ms cubic-bezier(0.34, 1.56, 0.64, 1);
    
    /* Z-Index */
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-modal-backdrop: 300;
    --z-modal: 400;
    --z-toast: 500;
}

/* Dark Mode */
[data-theme="dark"] {
    --color-bg: #0a0a0f;
    --color-bg-secondary: #111118;
    --color-bg-tertiary: #18181b;
    --color-surface: #1a1a24;
    --color-surface-elevated: #222230;
    --color-text: #fafafa;
    --color-text-secondary: #a3a3a3;
    --color-text-muted: #737373;
    --color-border: #27272a;
    --color-border-light: #1f1f23;
    
    --gradient-glass: linear-gradient(135deg, rgba(26,26,36,0.9) 0%, rgba(26,26,36,0.7) 100%);
    
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.3), 0 4px 6px -2px rgba(0, 0, 0, 0.2);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.4), 0 10px 10px -5px rgba(0, 0, 0, 0.2);
    --shadow-glow: 0 0 40px rgba(99, 102, 241, 0.2);
}

/* ===========================================
   2. BASE RESET & TYPOGRAPHY
   =========================================== */

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    font-size: var(--text-base);
    line-height: var(--leading-normal);
    color: var(--color-text);
    background-color: var(--color-bg);
    transition: background-color var(--transition-slow), color var(--transition-slow);
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: 700;
    line-height: var(--leading-tight);
    color: var(--color-text);
}

h1 { font-size: var(--text-5xl); }
h2 { font-size: var(--text-4xl); }
h3 { font-size: var(--text-3xl); }
h4 { font-size: var(--text-2xl); }
h5 { font-size: var(--text-xl); }
h6 { font-size: var(--text-lg); }

p {
    color: var(--color-text-secondary);
    line-height: var(--leading-relaxed);
}

a {
    color: var(--primary-500);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--primary-600);
}

/* ===========================================
   3. LAYOUT
   =========================================== */

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-6);
}

.container-sm { max-width: 640px; }
.container-md { max-width: 768px; }
.container-lg { max-width: 1024px; }
.container-xl { max-width: 1280px; }

.section {
    padding: var(--space-20) 0;
}

.row {
    display: flex;
    flex-wrap: wrap;
    margin: 0 calc(var(--space-4) * -1);
}

.col {
    flex: 1;
    padding: 0 var(--space-4);
}

/* ===========================================
   4. NAVBAR
   =========================================== */

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: var(--z-sticky);
    padding: var(--space-4) 0;
    background: transparent;
    transition: all var(--transition-slow);
}

.navbar.scrolled {
    background: var(--gradient-glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: var(--shadow-lg);
    border-bottom: 1px solid var(--color-border-light);
}

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

.navbar-brand {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    font-family: var(--font-display);
    font-size: var(--text-xl);
    font-weight: 800;
    color: white;
    text-decoration: none;
    transition: transform var(--transition-base);
}

.navbar.scrolled .navbar-brand {
    color: var(--color-text);
}

.navbar-brand:hover {
    transform: scale(1.02);
}

.navbar-brand-icon {
    width: 40px;
    height: 40px;
    background: var(--gradient-primary);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--text-xl);
    box-shadow: var(--shadow-glow);
}

.navbar-nav {
    display: flex;
    align-items: center;
    gap: var(--space-8);
    list-style: none;
}

.nav-link {
    font-weight: 500;
    color: rgba(255, 255, 255, 0.9);
    transition: color var(--transition-fast);
}

.navbar.scrolled .nav-link {
    color: var(--color-text-secondary);
}

.nav-link:hover {
    color: white;
}

.navbar.scrolled .nav-link:hover {
    color: var(--primary-500);
}

/* Dark Mode Toggle */
.theme-toggle {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-full);
    border: none;
    background: rgba(255, 255, 255, 0.1);
    color: white;
    font-size: var(--text-xl);
    cursor: pointer;
    transition: all var(--transition-base);
    display: flex;
    align-items: center;
    justify-content: center;
}

.navbar.scrolled .theme-toggle {
    background: var(--color-bg-tertiary);
    color: var(--color-text);
}

.theme-toggle:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: rotate(15deg);
}

/* ===========================================
   5. BUTTONS
   =========================================== */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-6);
    font-family: var(--font-sans);
    font-size: var(--text-base);
    font-weight: 600;
    line-height: 1;
    text-decoration: none;
    border: none;
    border-radius: var(--radius-xl);
    cursor: pointer;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.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 var(--transition-slow);
}

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

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(99, 102, 241, 0.5);
}

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

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

.btn-secondary:hover {
    border-color: var(--primary-500);
    color: var(--primary-500);
}

.btn-ghost {
    background: transparent;
    color: var(--color-text);
}

.btn-ghost:hover {
    background: var(--color-bg-tertiary);
}

.btn-lg {
    padding: var(--space-4) var(--space-8);
    font-size: var(--text-lg);
    border-radius: var(--radius-2xl);
}

.btn-sm {
    padding: var(--space-2) var(--space-4);
    font-size: var(--text-sm);
}

.btn-icon {
    width: 44px;
    height: 44px;
    padding: 0;
    border-radius: var(--radius-full);
}

/* ===========================================
   6. CARDS
   =========================================== */

.card {
    background: var(--color-surface);
    border-radius: var(--radius-2xl);
    border: 1px solid var(--color-border);
    transition: all var(--transition-base);
}

.card-hover:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-200);
}

.card-glass {
    background: var(--gradient-glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
}

.card-gradient {
    background: var(--gradient-subtle);
    border: 1px solid rgba(99, 102, 241, 0.2);
}

.card-body {
    padding: var(--space-6);
}

.card-header {
    padding: var(--space-6);
    border-bottom: 1px solid var(--color-border);
}

/* ===========================================
   7. FORM ELEMENTS
   =========================================== */

.form-group {
    margin-bottom: var(--space-5);
}

.form-label {
    display: block;
    margin-bottom: var(--space-2);
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--color-text);
}

.form-control,
.form-select {
    width: 100%;
    padding: var(--space-4);
    font-family: var(--font-sans);
    font-size: var(--text-base);
    color: var(--color-text);
    background: var(--color-surface);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-xl);
    transition: all var(--transition-base);
    appearance: none;
}

.form-control:focus,
.form-select:focus {
    outline: none;
    border-color: var(--primary-500);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.15);
}

.form-control::placeholder {
    color: var(--color-text-muted);
}

.form-select {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23737373' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right var(--space-4) center;
    background-size: 20px;
    padding-right: var(--space-12);
}

/* ===========================================
   8. BADGES
   =========================================== */

.badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    padding: var(--space-1) var(--space-3);
    font-size: var(--text-xs);
    font-weight: 600;
    border-radius: var(--radius-full);
    background: var(--color-bg-tertiary);
    color: var(--color-text-secondary);
}

.badge-primary {
    background: var(--primary-100);
    color: var(--primary-700);
}

.badge-success {
    background: var(--success-50);
    color: var(--success-600);
}

.badge-warning {
    background: var(--warning-50);
    color: var(--warning-600);
}

.badge-error {
    background: var(--error-50);
    color: var(--error-600);
}

/* ===========================================
   9. ANIMATIONS
   =========================================== */

/* Fade In */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* Fade In Up */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Fade In Scale */
@keyframes fadeInScale {
    from {
        opacity: 0;
        transform: scale(0.95);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

/* Slide In Right */
@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* Float */
@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

/* Pulse */
@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* Spin */
@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

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

/* Gradient Shift */
@keyframes gradientShift {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

/* Animation Classes */
.animate-fade-in { animation: fadeIn 0.5s ease-out; }
.animate-fade-in-up { animation: fadeInUp 0.5s ease-out; }
.animate-fade-in-scale { animation: fadeInScale 0.5s ease-out; }
.animate-slide-in-right { animation: slideInRight 0.5s ease-out; }
.animate-float { animation: float 3s ease-in-out infinite; }
.animate-pulse { animation: pulse 2s ease-in-out infinite; }
.animate-spin { animation: spin 1s linear infinite; }

/* Stagger Children */
.stagger-children > *:nth-child(1) { animation-delay: 0s; }
.stagger-children > *:nth-child(2) { animation-delay: 0.1s; }
.stagger-children > *:nth-child(3) { animation-delay: 0.2s; }
.stagger-children > *:nth-child(4) { animation-delay: 0.3s; }
.stagger-children > *:nth-child(5) { animation-delay: 0.4s; }
.stagger-children > *:nth-child(6) { animation-delay: 0.5s; }

/* Hover Effects */
.hover-lift {
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}
.hover-lift:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.hover-glow:hover {
    box-shadow: var(--shadow-glow);
}

/* ===========================================
   10. SKELETON LOADING
   =========================================== */

.skeleton {
    background: linear-gradient(
        90deg,
        var(--color-bg-tertiary) 25%,
        var(--color-bg-secondary) 50%,
        var(--color-bg-tertiary) 75%
    );
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    border-radius: var(--radius-md);
}

.skeleton-text {
    height: 1em;
    margin-bottom: var(--space-2);
}

.skeleton-title {
    height: 2em;
    width: 60%;
}

.skeleton-avatar {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-full);
}

.skeleton-card {
    height: 200px;
    border-radius: var(--radius-2xl);
}

/* ===========================================
   11. FOOTER
   =========================================== */

.footer {
    background: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
    padding: var(--space-16) 0;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-10);
}

.footer-brand {
    grid-column: 1 / 2;
}

.footer-brand-text {
    font-family: var(--font-display);
    font-size: var(--text-xl);
    font-weight: 800;
    color: var(--color-text);
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.footer-description {
    margin-top: var(--space-4);
    color: var(--color-text-muted);
    font-size: var(--text-sm);
}

.footer-section-title {
    font-size: var(--text-sm);
    font-weight: 700;
    color: var(--color-text);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--space-4);
}

.footer-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.footer-link {
    color: var(--color-text-muted);
    font-size: var(--text-sm);
    transition: color var(--transition-fast);
}

.footer-link:hover {
    color: var(--primary-500);
}

.footer-bottom {
    margin-top: var(--space-12);
    padding-top: var(--space-8);
    border-top: 1px solid var(--color-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-copyright {
    color: var(--color-text-muted);
    font-size: var(--text-sm);
}

/* ===========================================
   12. UTILITIES
   =========================================== */

/* Text */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.text-primary { color: var(--primary-500); }
.text-secondary { color: var(--color-text-secondary); }
.text-muted { color: var(--color-text-muted); }
.text-success { color: var(--success-500); }
.text-warning { color: var(--warning-500); }
.text-error { color: var(--error-500); }

.font-display { font-family: var(--font-display); }
.font-bold { font-weight: 700; }
.font-semibold { font-weight: 600; }
.font-medium { font-weight: 500; }

/* Spacing */
.mt-0 { margin-top: 0; }
.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mt-8 { margin-top: var(--space-8); }
.mb-0 { margin-bottom: 0; }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); }
.my-4 { margin-top: var(--space-4); margin-bottom: var(--space-4); }
.my-8 { margin-top: var(--space-8); margin-bottom: var(--space-8); }

.pt-8 { padding-top: var(--space-8); }
.pb-8 { padding-bottom: var(--space-8); }
.py-8 { padding-top: var(--space-8); padding-bottom: var(--space-8); }
.px-4 { padding-left: var(--space-4); padding-right: var(--space-4); }
.px-6 { padding-left: var(--space-6); padding-right: var(--space-6); }

/* Flexbox */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: var(--space-2); }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }

/* Grid */
.grid { display: grid; }
.grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid-cols-4 { grid-template-columns: repeat(4, 1fr); }

/* Display */
.hidden { display: none; }
.block { display: block; }
.inline-block { display: inline-block; }

/* Width */
.w-full { width: 100%; }
.max-w-xl { max-width: 36rem; }
.max-w-2xl { max-width: 42rem; }

/* Border Radius */
.rounded-full { border-radius: var(--radius-full); }
.rounded-2xl { border-radius: var(--radius-2xl); }

/* Gradients */
.bg-gradient-primary { background: var(--gradient-primary); }
.bg-gradient-hero { background: var(--gradient-hero); }

/* ===========================================
   13. RESPONSIVE
   =========================================== */

@media (max-width: 1024px) {
    h1 { font-size: var(--text-4xl); }
    h2 { font-size: var(--text-3xl); }
    
    .footer-content {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Navbar Actions */
.navbar-actions {
    display: flex;
    align-items: center;
    gap: var(--space-4);
}

/* Mobile Toggle (hidden on desktop) */
.navbar-mobile-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 40px;
    height: 40px;
    padding: 8px;
    border: none;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-base);
    z-index: 10;
}

.navbar.scrolled .navbar-mobile-toggle {
    background: var(--color-bg-tertiary);
}

.hamburger-line {
    display: block;
    width: 100%;
    height: 2px;
    background: white;
    border-radius: 2px;
    transition: all var(--transition-base);
}

.navbar.scrolled .hamburger-line {
    background: var(--color-text);
}

/* Hamburger → X animation */
.navbar-mobile-toggle.active .hamburger-line:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}
.navbar-mobile-toggle.active .hamburger-line:nth-child(2) {
    opacity: 0;
}
.navbar-mobile-toggle.active .hamburger-line:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* Mobile Menu Panel (hidden by default) */
.navbar-mobile-menu {
    display: none;
    padding: var(--space-6) var(--space-4);
    margin-top: var(--space-3);
    border-radius: var(--radius-2xl);
    background: rgba(30, 20, 60, 0.92);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border: 1px solid rgba(255, 255, 255, 0.12);
    box-shadow: 0 16px 48px rgba(0, 0, 0, 0.4), inset 0 1px 0 rgba(255,255,255,0.08);
    animation: fadeInUp 0.3s ease-out;
}

.navbar.scrolled .navbar-mobile-menu {
    background: var(--gradient-glass);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border-color: var(--color-border);
    box-shadow: var(--shadow-xl);
}

[data-theme="dark"] .navbar-mobile-menu {
    background: rgba(10, 10, 20, 0.95);
    border-color: rgba(255, 255, 255, 0.08);
}

.navbar-mobile-menu.active {
    display: block;
}

.mobile-nav-links {
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
}

.mobile-nav-link {
    display: block;
    padding: var(--space-3) var(--space-4);
    color: rgba(255, 255, 255, 0.95);
    font-weight: 600;
    font-size: var(--text-base);
    border-radius: var(--radius-lg);
    text-decoration: none;
    transition: all var(--transition-fast);
    letter-spacing: 0.01em;
}

.navbar.scrolled .mobile-nav-link {
    color: var(--color-text);
}

.mobile-nav-link:hover {
    background: rgba(255, 255, 255, 0.15);
    color: white;
    transform: translateX(4px);
}

.navbar.scrolled .mobile-nav-link:hover {
    background: var(--color-bg-tertiary);
    color: var(--primary-500);
}

.mobile-nav-auth {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    margin-top: var(--space-4);
    padding-top: var(--space-4);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.navbar.scrolled .mobile-nav-auth {
    border-top-color: var(--color-border);
}

/* Desktop-only elements (hidden on mobile) */
.navbar-desktop-only {
    display: inline-flex;
}

@media (max-width: 768px) {
    :root {
        --text-5xl: 2.5rem;
        --text-4xl: 2rem;
        --text-3xl: 1.5rem;
    }
    
    .container {
        padding: 0 var(--space-4);
    }
    
    .navbar-nav {
        display: none;
    }
    
    .navbar-desktop-only {
        display: none !important;
    }
    
    .navbar-mobile-toggle {
        display: flex;
    }
    
    .navbar-actions {
        gap: var(--space-2);
    }
    
    .theme-toggle {
        width: 36px;
        height: 36px;
        font-size: var(--text-base);
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--space-8);
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: var(--space-4);
        text-align: center;
    }
    
    .grid-cols-4 { grid-template-columns: repeat(2, 1fr); }
    .grid-cols-3 { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
    .grid-cols-2 { grid-template-columns: 1fr; }
}

/* ===========================================
   14. PRINT STYLES
   =========================================== */

@media print {
    .navbar,
    .footer,
    .btn {
        display: none !important;
    }
    
    body {
        background: white;
        color: black;
    }
}