/* ========================================
   SabbiaViva Modern Design System
   Premium Art Marketplace
   ======================================== */

/* ========================================
   1. CSS VARIABLES & THEME DEFINITION
   ======================================== */
:root {
  /* Light Theme */
  --color-bg-primary: #F7F5F2;
  --color-bg-secondary: #FFFFFF;
  --color-bg-tertiary: #F0EDE8;
  --color-text-primary: #3D3522;
  --color-text-secondary: #6B6B6B;
  --color-text-tertiary: #999999;
  --color-accent-primary: #C06C5D;
  --color-accent-secondary: #D4AC6E;
  --color-accent-tertiary: #8B7355;
  --color-border: rgba(0, 0, 0, 0.08);
  --color-shadow-light: rgba(0, 0, 0, 0.04);
  --color-shadow-medium: rgba(0, 0, 0, 0.08);
  --color-shadow-dark: rgba(0, 0, 0, 0.16);

  /* Dark Theme */
  --color-bg-primary-dark: #1a1814;
  --color-bg-secondary-dark: #2a2620;
  --color-bg-tertiary-dark: #3a3530;
  --color-text-primary-dark: #f5f1ed;
  --color-text-secondary-dark: #c5c1bd;
  --color-text-tertiary-dark: #8b8985;
  --color-accent-primary-dark: #E08470;
  --color-accent-secondary-dark: #E8C080;

  /* Typography */
  --font-display: 'Playfair Display', serif;
  --font-body: 'Lato', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.5rem;
  --font-size-2xl: 2rem;
  --font-size-3xl: 2.5rem;
  --font-size-4xl: 3rem;
  --font-size-5xl: 3.5rem;

  /* 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;

  /* Border Radius */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.5s ease;

  /* Z-index */
  --z-base: 1;
  --z-dropdown: 100;
  --z-sticky: 500;
  --z-fixed: 1000;
  --z-modal: 1050;
}

/* Dark Theme */
[data-theme='dark'] {
  --color-bg-primary: var(--color-bg-primary-dark);
  --color-bg-secondary: var(--color-bg-secondary-dark);
  --color-bg-tertiary: var(--color-bg-tertiary-dark);
  --color-text-primary: var(--color-text-primary-dark);
  --color-text-secondary: var(--color-text-secondary-dark);
  --color-text-tertiary: var(--color-text-tertiary-dark);
  --color-accent-primary: var(--color-accent-primary-dark);
  --color-accent-secondary: var(--color-accent-secondary-dark);
  --color-border: rgba(255, 255, 255, 0.08);
  --color-shadow-light: rgba(0, 0, 0, 0.2);
  --color-shadow-medium: rgba(0, 0, 0, 0.4);
  --color-shadow-dark: rgba(0, 0, 0, 0.6);
}

/* ========================================
   2. GLOBAL STYLES
   ======================================== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-body);
  color: var(--color-text-primary);
  background-color: var(--color-bg-primary);
  transition: background-color var(--transition-base), color var(--transition-base);
  line-height: 1.6;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-text-primary);
}

h1 { font-size: var(--font-size-5xl); }
h2 { font-size: var(--font-size-4xl); margin-bottom: var(--spacing-2xl); }
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }
h5 { font-size: var(--font-size-lg); }
h6 { font-size: var(--font-size-base); }

p {
  margin-bottom: var(--spacing-md);
  color: var(--color-text-secondary);
}

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

a:hover {
  color: var(--color-accent-secondary);
}

/* ========================================
   3. HEADER & NAVIGATION
   ======================================== */
header {
  background-color: var(--color-bg-secondary);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  transition: background-color var(--transition-base);
  box-shadow: 0 2px 8px var(--color-shadow-light);
}

.navbar {
  padding: var(--spacing-lg) 0;
  background-color: transparent !important;
}

.navbar-brand {
  font-family: var(--font-display);
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: var(--color-text-primary) !important;
  letter-spacing: -0.5px;
}

.nav-link {
  color: var(--color-text-primary) !important;
  font-size: var(--font-size-sm);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin: 0 var(--spacing-lg);
  position: relative;
  transition: color var(--transition-fast);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-accent-primary);
  transition: width var(--transition-base);
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

.language-switcher {
  display: flex;
  gap: var(--spacing-sm);
  margin-left: var(--spacing-xl);
  align-items: center;
}

.lang-btn {
  background-color: transparent;
  border: 1px solid var(--color-border);
  color: var(--color-text-primary);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  cursor: pointer;
  font-size: var(--font-size-sm);
  font-weight: 600;
  transition: all var(--transition-fast);
}

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

.lang-btn.active {
  background-color: var(--color-accent-primary);
  border-color: var(--color-accent-primary);
  color: #FFF;
}

.theme-toggle {
  background-color: transparent;
  border: 1px solid var(--color-border);
  color: var(--color-text-primary);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  cursor: pointer;
  font-size: var(--font-size-lg);
  transition: all var(--transition-fast);
  margin-left: var(--spacing-md);
}

.theme-toggle:hover {
  background-color: var(--color-bg-tertiary);
  border-color: var(--color-accent-primary);
}

/* ========================================
   4. BENTO GRID LAYOUT
   ======================================== */
.bento-container {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-3xl);
}

.bento-item {
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition-base);
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  box-shadow: 0 4px 12px var(--color-shadow-light);
}

.bento-item:hover {
  transform: translateY(-8px);
  box-shadow: 0 12px 24px var(--color-shadow-medium);
}

.bento-item.span-1 { grid-column: span 12; }
.bento-item.span-2 { grid-column: span 6; }
.bento-item.span-3 { grid-column: span 4; }
.bento-item.span-4 { grid-column: span 3; }

.bento-item-image {
  width: 100%;
  height: 300px;
  object-fit: cover;
  display: block;
}

.bento-item.span-1 .bento-item-image {
  height: 400px;
}

.bento-item-content {
  padding: var(--spacing-xl);
}

@media (max-width: 1200px) {
  .bento-item.span-1 { grid-column: span 12; }
  .bento-item.span-2 { grid-column: span 6; }
  .bento-item.span-3 { grid-column: span 6; }
  .bento-item.span-4 { grid-column: span 6; }
}

@media (max-width: 768px) {
  .bento-container {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }

  .bento-item { grid-column: span 1 !important; }
  .bento-item-image { height: 250px; }
  .bento-item-content { padding: var(--spacing-lg); }
}

/* ========================================
   5. HERO SECTION
   ======================================== */
.hero-section {
  position: relative;
  height: 600px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: #FFF;
  margin-bottom: var(--spacing-3xl);
  border-radius: var(--radius-lg);
}

.hero-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, rgba(0,0,0,0.4) 0%, rgba(0,0,0,0.2) 100%);
  z-index: 1;
}

.hero-section .container {
  z-index: 2;
  position: relative;
}

.hero-section h1 {
  font-size: var(--font-size-5xl);
  margin-bottom: var(--spacing-lg);
  color: #FFF;
  animation: slideInDown 0.8s ease-out;
}

.hero-section p {
  font-size: var(--font-size-xl);
  margin-bottom: var(--spacing-2xl);
  color: rgba(255, 255, 255, 0.9);
  animation: slideInUp 0.8s ease-out 0.2s both;
}

@keyframes slideInDown {
  from {
    opacity: 0;
    transform: translateY(-30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 768px) {
  .hero-section {
    height: 400px;
  }

  .hero-section h1 {
    font-size: var(--font-size-3xl);
  }

  .hero-section p {
    font-size: var(--font-size-lg);
  }
}

/* ========================================
   6. CARDS & TILES
   ======================================== */
.card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background-color: var(--color-bg-secondary);
  box-shadow: 0 4px 12px var(--color-shadow-light);
  transition: all var(--transition-base);
  overflow: hidden;
}

.card:hover {
  transform: translateY(-8px);
  box-shadow: 0 12px 24px var(--color-shadow-medium);
}

.card-img-top {
  height: 250px;
  object-fit: cover;
  display: block;
}

.card-body {
  padding: var(--spacing-xl);
}

.card-title {
  color: var(--color-text-primary);
  font-family: var(--font-display);
  margin-bottom: var(--spacing-md);
}

/* ========================================
   7. BUTTONS
   ======================================== */
.btn {
  padding: var(--spacing-md) var(--spacing-xl);
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: var(--font-size-sm);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  border: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition-base);
  display: inline-block;
  text-decoration: none;
  text-align: center;
}

.btn-primary {
  background-color: var(--color-accent-primary);
  color: #FFF;
  border-color: var(--color-accent-primary);
}

.btn-primary:hover {
  background-color: var(--color-accent-tertiary);
  border-color: var(--color-accent-tertiary);
  transform: translateY(-2px);
}

.btn-secondary {
  background-color: transparent;
  color: var(--color-accent-primary);
  border-color: var(--color-accent-primary);
}

.btn-secondary:hover {
  background-color: var(--color-accent-primary);
  color: #FFF;
}

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

/* ========================================
   8. TESTIMONIALS
   ======================================== */
.testimonial-card {
  background-color: var(--color-bg-secondary);
  border-left: 4px solid var(--color-accent-secondary);
  padding: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
  box-shadow: 0 4px 12px var(--color-shadow-light);
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
}

.testimonial-card:hover {
  transform: translateX(8px);
  box-shadow: 0 8px 16px var(--color-shadow-medium);
}

.testimonial-card p {
  font-style: italic;
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-md);
  line-height: 1.8;
}

.testimonial-author {
  font-weight: 600;
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
}

/* ========================================
   9. FORMS
   ======================================== */
.form-group {
  margin-bottom: var(--spacing-lg);
}

.form-control {
  background-color: var(--color-bg-primary);
  border: 1px solid var(--color-border);
  color: var(--color-text-primary);
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--radius-md);
  font-family: var(--font-body);
  font-size: var(--font-size-base);
  transition: all var(--transition-fast);
}

.form-control:focus {
  background-color: var(--color-bg-secondary);
  border-color: var(--color-accent-primary);
  color: var(--color-text-primary);
  box-shadow: 0 0 0 3px rgba(192, 108, 93, 0.1);
}

label {
  color: var(--color-text-primary);
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
  display: block;
}

/* ========================================
   10. FOOTER
   ======================================== */
footer {
  background-color: var(--color-text-primary);
  color: var(--color-bg-primary);
  padding: var(--spacing-3xl) 0 var(--spacing-lg);
  margin-top: var(--spacing-3xl);
  transition: background-color var(--transition-base);
}

[data-theme='dark'] footer {
  background-color: #0d0b08;
}

footer h5 {
  color: var(--color-bg-primary);
  font-family: var(--font-display);
  margin-bottom: var(--spacing-md);
  font-size: var(--font-size-lg);
}

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

footer a:hover {
  color: var(--color-accent-secondary);
}

footer p {
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: var(--spacing-sm);
}

footer .accent-gold {
  color: var(--color-accent-secondary);
}

footer hr {
  border-color: rgba(255, 255, 255, 0.1);
  margin: var(--spacing-2xl) 0;
}

/* ========================================
   11. UTILITIES
   ======================================== */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--spacing-xl);
}

.section-title {
  text-align: center;
  margin-bottom: var(--spacing-3xl);
  position: relative;
  padding-bottom: var(--spacing-lg);
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--color-accent-secondary), transparent);
  border-radius: 2px;
}

.py-5 {
  padding-top: var(--spacing-3xl) !important;
  padding-bottom: var(--spacing-3xl) !important;
}

.mb-3 { margin-bottom: var(--spacing-lg) !important; }
.mb-4 { margin-bottom: var(--spacing-xl) !important; }
.mb-5 { margin-bottom: var(--spacing-2xl) !important; }

.mt-5 { margin-top: var(--spacing-2xl) !important; }

.text-center { text-align: center; }
.text-muted { color: var(--color-text-tertiary) !important; }
.text-white { color: #FFF; }

/* ========================================
   12. ANIMATIONS
   ======================================== */
@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

.fade-in {
  animation: fadeIn 0.6s ease-out;
}

/* ========================================
   13. COOKIE BANNER
   ======================================== */
.cookie-banner {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background-color: var(--color-text-primary);
  color: var(--color-bg-primary);
  padding: var(--spacing-lg) var(--spacing-xl);
  z-index: var(--z-modal);
  display: none;
  box-shadow: 0 -4px 12px var(--color-shadow-dark);
}

.cookie-banner.show {
  display: flex;
}

.cookie-banner p {
  margin: 0;
  color: inherit;
}

/* ========================================
   14. RESPONSIVE ADJUSTMENTS
   ======================================== */
@media (max-width: 1024px) {
  .container {
    padding: 0 var(--spacing-lg);
  }

  h1 { font-size: var(--font-size-4xl); }
  h2 { font-size: var(--font-size-3xl); }
}

@media (max-width: 768px) {
  .nav-link {
    margin: 0 var(--spacing-sm);
  }

  .theme-toggle,
  .language-switcher {
    margin-left: auto;
  }

  h1 { font-size: var(--font-size-3xl); }
  h2 { font-size: var(--font-size-2xl); }

  .section-title {
    font-size: var(--font-size-2xl);
  }

  .container {
    padding: 0 var(--spacing-md);
  }
}