/* ============================================
   AI Home Design Platform - Design System
   Apple + Linear + Vercel Aesthetic
   ============================================ */

/* --- Design Tokens --- */
:root {
  /* Colors - Light Mode */
  --bg-primary: #FAFAFA;
  --bg-surface: #FFFFFF;
  --bg-elevated: #FFFFFF;
  --bg-muted: #F4F4F5;
  --bg-hover: #F4F4F5;
  --bg-active: #E4E4E7;
  --bg-overlay: rgba(0, 0, 0, 0.5);

  --text-primary: #18181B;
  --text-secondary: #52525B;
  --text-tertiary: #A1A1AA;
  --text-inverse: #FAFAFA;
  --text-link: #2563EB;

  --border-primary: #E4E4E7;
  --border-secondary: #F4F4F5;

  --accent: #2563EB;
  --accent-hover: #1D4ED8;
  --accent-light: rgba(37, 99, 235, 0.08);
  --accent-text: #2563EB;

  --success: #10B981;
  --success-light: rgba(16, 185, 129, 0.08);
  --warning: #F59E0B;
  --warning-light: rgba(245, 158, 11, 0.08);
  --error: #EF4444;
  --error-light: rgba(239, 68, 68, 0.08);

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Noto Sans SC', 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'SF 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;

  /* 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;
  --space-24: 6rem;

  /* Radius */
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --radius-xl: 12px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.06), 0 2px 4px -2px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.06), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.08), 0 8px 10px -6px rgba(0, 0, 0, 0.04);

  /* Transitions */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --duration-fast: 100ms;
  --duration-normal: 150ms;
  --duration-slow: 200ms;

  /* Layout */
  --sidebar-width: 260px;
  --topbar-height: 64px;
  --max-width: 1400px;
}

/* --- Dark Mode --- */
[data-theme="dark"] {
  --bg-primary: #09090B;
  --bg-surface: #18181B;
  --bg-elevated: #1C1C20;
  --bg-muted: #27272A;
  --bg-hover: #27272A;
  --bg-active: #3F3F46;
  --bg-overlay: rgba(0, 0, 0, 0.7);

  --text-primary: #FAFAFA;
  --text-secondary: #A1A1AA;
  --text-tertiary: #71717A;
  --text-inverse: #18181B;
  --text-link: #60A5FA;

  --border-primary: #27272A;
  --border-secondary: #1C1C20;

  --accent: #3B82F6;
  --accent-hover: #60A5FA;
  --accent-light: rgba(59, 130, 246, 0.12);
  --accent-text: #60A5FA;

  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.2);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3), 0 1px 2px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -2px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.3), 0 4px 6px -4px rgba(0, 0, 0, 0.2);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.4), 0 8px 10px -6px rgba(0, 0, 0, 0.2);
}

/* --- Reset & Base --- */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  transition: background-color var(--duration-slow) var(--ease-out),
              color var(--duration-slow) var(--ease-out);
}

a {
  color: var(--text-link);
  text-decoration: none;
  transition: color var(--duration-normal) var(--ease-out);
}
a:hover { opacity: 0.8; }

img { max-width: 100%; height: auto; display: block; }

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
  font-size: inherit;
}

input, textarea, select {
  font-family: inherit;
  font-size: inherit;
  border: none;
  outline: none;
  background: none;
}

ul, ol { list-style: none; }

h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

/* --- Utility Classes --- */
.sr-only {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0, 0, 0, 0); border: 0;
}

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

/* --- Typography --- */
.text-xs { font-size: var(--text-xs); }
.text-sm { font-size: var(--text-sm); }
.text-base { font-size: var(--text-base); }
.text-lg { font-size: var(--text-lg); }
.text-xl { font-size: var(--text-xl); }
.text-2xl { font-size: var(--text-2xl); }
.text-3xl { font-size: var(--text-3xl); }
.text-4xl { font-size: var(--text-4xl); }
.text-5xl { font-size: var(--text-5xl); }

.font-medium { font-weight: 500; }
.font-semibold { font-weight: 600; }
.font-bold { font-weight: 700; }

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

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  font-weight: 500;
  line-height: 1.5;
  border-radius: var(--radius-md);
  transition: all var(--duration-normal) var(--ease-out);
  white-space: nowrap;
  user-select: none;
  height: 36px;
}
.btn:active { transform: scale(0.98); }

.btn-primary {
  background: var(--accent);
  color: #fff;
}
.btn-primary:hover { background: var(--accent-hover); opacity: 1; }

.btn-secondary {
  background: var(--bg-surface);
  color: var(--text-primary);
  border: 1px solid var(--border-primary);
}
.btn-secondary:hover { background: var(--bg-hover); opacity: 1; }

.btn-ghost {
  color: var(--text-secondary);
}
.btn-ghost:hover { background: var(--bg-hover); color: var(--text-primary); opacity: 1; }

.btn-danger {
  background: var(--error);
  color: #fff;
}
.btn-danger:hover { background: #DC2626; opacity: 1; }

.btn-lg { height: 44px; padding: var(--space-3) var(--space-6); font-size: var(--text-base); border-radius: var(--radius-lg); }
.btn-sm { height: 30px; padding: var(--space-1) var(--space-3); font-size: var(--text-xs); }
.btn-icon { width: 36px; height: 36px; padding: 0; }
.btn-icon.btn-lg { width: 44px; }

/* --- Form Controls --- */
.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

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

.form-input {
  height: 40px;
  padding: 0 var(--space-3);
  background: var(--bg-surface);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  transition: border-color var(--duration-normal) var(--ease-out),
              box-shadow var(--duration-normal) var(--ease-out);
}
.form-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-light);
}
.form-input::placeholder { color: var(--text-tertiary); }

textarea.form-input {
  height: auto;
  min-height: 100px;
  padding: var(--space-3);
  resize: vertical;
}

select.form-input {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' fill='%2371717a' viewBox='0 0 16 16'%3E%3Cpath d='M4.5 6l3.5 4 3.5-4z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 36px;
}

/* --- Cards --- */
.card {
  background: var(--bg-surface);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  transition: box-shadow var(--duration-normal) var(--ease-out),
              transform var(--duration-normal) var(--ease-out);
}
.card:hover {
  box-shadow: var(--shadow-md);
}
.card-interactive:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-4);
}

.card-title {
  font-size: var(--text-lg);
  font-weight: 600;
}

/* --- Badge --- */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 2px var(--space-2);
  font-size: var(--text-xs);
  font-weight: 500;
  border-radius: var(--radius-full);
  line-height: 1.5;
}
.badge-default { background: var(--bg-muted); color: var(--text-secondary); }
.badge-primary { background: var(--accent-light); color: var(--accent-text); }
.badge-success { background: var(--success-light); color: var(--success); }
.badge-warning { background: var(--warning-light); color: var(--warning); }
.badge-error { background: var(--error-light); color: var(--error); }

/* --- Avatar --- */
.avatar {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  background: var(--bg-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--text-secondary);
  overflow: hidden;
  flex-shrink: 0;
}
.avatar-sm { width: 28px; height: 28px; font-size: var(--text-xs); }
.avatar-lg { width: 48px; height: 48px; font-size: var(--text-lg); }
.avatar-xl { width: 64px; height: 64px; font-size: var(--text-2xl); }
.avatar img { width: 100%; height: 100%; object-fit: cover; }

/* --- Table --- */
.table-wrapper { overflow-x: auto; }
.table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--text-sm);
}
.table th {
  text-align: left;
  padding: var(--space-3) var(--space-4);
  font-weight: 500;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border-primary);
  white-space: nowrap;
}
.table td {
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--border-secondary);
  color: var(--text-primary);
}
.table tbody tr:hover { background: var(--bg-hover); }

/* --- Modal --- */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: var(--bg-overlay);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: all var(--duration-slow) var(--ease-out);
}
.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}
.modal {
  background: var(--bg-surface);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  max-width: 480px;
  width: 90%;
  max-height: 90vh;
  overflow-y: auto;
  transform: translateY(8px) scale(0.98);
  transition: transform var(--duration-slow) var(--ease-out);
  box-shadow: var(--shadow-xl);
}
.modal-overlay.active .modal {
  transform: translateY(0) scale(1);
}

/* --- Tabs --- */
.tabs {
  display: flex;
  gap: var(--space-1);
  border-bottom: 1px solid var(--border-primary);
}
.tab {
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-secondary);
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  transition: all var(--duration-normal) var(--ease-out);
  cursor: pointer;
}
.tab:hover { color: var(--text-primary); }
.tab.active {
  color: var(--text-primary);
  border-bottom-color: var(--text-primary);
}

/* --- Toast / Notification --- */
.toast-container {
  position: fixed;
  top: var(--space-6);
  right: var(--space-6);
  z-index: 2000;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}
.toast {
  background: var(--bg-surface);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  padding: var(--space-4) var(--space-5);
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: var(--space-3);
  min-width: 300px;
  animation: slideInRight var(--duration-slow) var(--ease-out);
}

/* --- Skeleton Loading --- */
.skeleton {
  background: linear-gradient(90deg, var(--bg-muted) 25%, var(--bg-hover) 50%, var(--bg-muted) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: var(--radius-md);
}

/* --- Icons (SVG inline) --- */
.icon {
  width: 20px;
  height: 20px;
  stroke: currentColor;
  stroke-width: 1.5;
  stroke-linecap: round;
  stroke-linejoin: round;
  fill: none;
  flex-shrink: 0;
}
.icon-sm { width: 16px; height: 16px; }
.icon-lg { width: 24px; height: 24px; }
.icon-xl { width: 32px; height: 32px; }

/* --- Animations --- */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes slideInRight {
  from { opacity: 0; transform: translateX(16px); }
  to { opacity: 1; transform: translateX(0); }
}
@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}
@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.animate-fade-in { animation: fadeIn var(--duration-slow) var(--ease-out); }

/* --- Scrollbar --- */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border-primary); border-radius: var(--radius-full); }
::-webkit-scrollbar-thumb:hover { background: var(--text-tertiary); }

/* ============================================
   Layout: App Shell
   ============================================ */

/* --- Top Navigation (Public Pages) --- */
.topnav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--topbar-height);
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-primary);
  display: flex;
  align-items: center;
  padding: 0 var(--space-6);
  z-index: 100;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}
.topnav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.topnav-brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-weight: 700;
  font-size: var(--text-lg);
  color: var(--text-primary);
  letter-spacing: -0.03em;
}
.topnav-brand svg { width: 28px; height: 28px; }
.topnav-links {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}
.topnav-links a {
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-sm);
  color: var(--text-secondary);
  border-radius: var(--radius-md);
  transition: all var(--duration-normal) var(--ease-out);
}
.topnav-links a:hover { color: var(--text-primary); background: var(--bg-hover); opacity: 1; }
.topnav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

/* --- Sidebar (Dashboard/Admin) --- */
.app-layout {
  display: flex;
  min-height: 100vh;
  padding-top: var(--topbar-height);
}
.sidebar {
  position: fixed;
  top: var(--topbar-height);
  left: 0;
  bottom: 0;
  width: var(--sidebar-width);
  background: var(--bg-surface);
  border-right: 1px solid var(--border-primary);
  overflow-y: auto;
  padding: var(--space-4) 0;
  z-index: 50;
  transition: transform var(--duration-slow) var(--ease-out);
}
.sidebar-section {
  padding: var(--space-2) var(--space-4);
}
.sidebar-label {
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: var(--space-2) var(--space-3);
  margin-bottom: var(--space-1);
}
.sidebar-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-sm);
  color: var(--text-secondary);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--duration-normal) var(--ease-out);
  text-decoration: none;
  margin-bottom: 1px;
}
.sidebar-item:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
  opacity: 1;
}
.sidebar-item.active {
  background: var(--accent-light);
  color: var(--accent-text);
  font-weight: 500;
}
.sidebar-item .icon { width: 18px; height: 18px; }

/* --- Main Content Area --- */
.main-content {
  flex: 1;
  margin-left: var(--sidebar-width);
  padding: var(--space-8);
  min-height: calc(100vh - var(--topbar-height));
}
.main-content-full {
  margin-left: 0;
}

/* --- Dashboard Header --- */
.page-header {
  margin-bottom: var(--space-8);
}
.page-title {
  font-size: var(--text-3xl);
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: var(--space-2);
}
.page-subtitle {
  font-size: var(--text-base);
  color: var(--text-secondary);
}

/* --- Stats Grid --- */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--space-4);
  margin-bottom: var(--space-8);
}
.stat-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
}
.stat-label {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  margin-bottom: var(--space-2);
}
.stat-value {
  font-size: var(--text-3xl);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1;
  margin-bottom: var(--space-2);
}
.stat-change {
  font-size: var(--text-xs);
  display: flex;
  align-items: center;
  gap: var(--space-1);
}
.stat-change.positive { color: var(--success); }
.stat-change.negative { color: var(--error); }

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

/* ============================================
   Page: Landing / Home
   ============================================ */
.landing { padding-top: var(--topbar-height); }

.hero {
  padding: var(--space-24) 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1) var(--space-3);
  background: var(--accent-light);
  color: var(--accent-text);
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  font-weight: 500;
  margin-bottom: var(--space-6);
}
.hero-title {
  font-size: var(--text-6xl);
  font-weight: 700;
  letter-spacing: -0.04em;
  line-height: 1.1;
  margin-bottom: var(--space-6);
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}
.hero-subtitle {
  font-size: var(--text-xl);
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto var(--space-10);
  line-height: 1.6;
}
.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
}
.hero-visual {
  margin-top: var(--space-16);
  position: relative;
}
.hero-mockup {
  background: var(--bg-surface);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-xl);
  padding: var(--space-4);
  box-shadow: var(--shadow-xl);
  max-width: 1000px;
  margin: 0 auto;
  aspect-ratio: 16/9;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}
.hero-mockup-inner {
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, var(--bg-muted) 0%, var(--bg-primary) 100%);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-tertiary);
  font-size: var(--text-lg);
}
.hero-image-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-4);
  max-width: 1100px;
  margin: 0 auto;
}
.hero-image-item {
  border-radius: var(--radius-lg);
  overflow: hidden;
  aspect-ratio: 3/4;
  background: var(--bg-surface);
  border: 1px solid var(--border-primary);
  box-shadow: var(--shadow-lg);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}
.hero-image-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
}
.hero-image-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
@media (max-width: 768px) {
  .hero-image-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-3);
  }
}
@media (max-width: 480px) {
  .hero-image-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-2);
  }
  .hero-image-item {
    aspect-ratio: 1/1;
  }
}

/* --- Feature Section --- */
.section {
  padding: var(--space-20) 0;
}
.section-header {
  text-align: center;
  margin-bottom: var(--space-12);
}
.section-title {
  font-size: var(--text-4xl);
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: var(--space-4);
}
.section-subtitle {
  font-size: var(--text-lg);
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
}
.feature-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  transition: all var(--duration-normal) var(--ease-out);
}
.feature-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}
.feature-icon {
  width: 44px;
  height: 44px;
  background: var(--accent-light);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-5);
  color: var(--accent-text);
}
.feature-title {
  font-size: var(--text-lg);
  font-weight: 600;
  margin-bottom: var(--space-3);
}
.feature-desc {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  line-height: 1.6;
}

/* --- AI Feature Cards (special gradient accent) --- */
.ai-card {
  position: relative;
  overflow: hidden;
}
.ai-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), #8B5CF6, var(--accent));
  opacity: 0;
  transition: opacity var(--duration-normal) var(--ease-out);
}
.ai-card:hover::before { opacity: 1; }

/* --- Testimonials / Social Proof --- */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
}
.testimonial-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
}
.testimonial-text {
  font-size: var(--text-base);
  line-height: 1.7;
  color: var(--text-secondary);
  margin-bottom: var(--space-5);
}
.testimonial-author {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}
.testimonial-name {
  font-size: var(--text-sm);
  font-weight: 600;
}
.testimonial-role {
  font-size: var(--text-xs);
  color: var(--text-tertiary);
}

/* --- CTA Section --- */
.cta-section {
  text-align: center;
  padding: var(--space-20) 0;
  border-top: 1px solid var(--border-primary);
}
.cta-title {
  font-size: var(--text-4xl);
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: var(--space-4);
}
.cta-subtitle {
  font-size: var(--text-lg);
  color: var(--text-secondary);
  margin-bottom: var(--space-8);
}

/* --- Footer --- */
.footer {
  border-top: 1px solid var(--border-primary);
  padding: var(--space-12) 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr repeat(3, 1fr);
  gap: var(--space-8);
  margin-bottom: var(--space-10);
}
.footer-brand-desc {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  margin-top: var(--space-4);
  line-height: 1.6;
  max-width: 300px;
}
.footer-col-title {
  font-size: var(--text-sm);
  font-weight: 600;
  margin-bottom: var(--space-4);
}
.footer-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}
.footer-links a {
  font-size: var(--text-sm);
  color: var(--text-secondary);
}
.footer-links a:hover { color: var(--text-primary); opacity: 1; }
.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-8);
  border-top: 1px solid var(--border-primary);
  font-size: var(--text-sm);
  color: var(--text-tertiary);
}

/* ============================================
   Page: Auth (Login / Register)
   ============================================ */
.auth-page {
  min-height: 100vh;
  display: flex;
}
.auth-left {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-8);
}
.auth-right {
  flex: 1;
  background: var(--bg-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-8);
}
.auth-form {
  max-width: 400px;
  width: 100%;
}
.auth-title {
  font-size: var(--text-3xl);
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: var(--space-2);
}
.auth-subtitle {
  font-size: var(--text-base);
  color: var(--text-secondary);
  margin-bottom: var(--space-8);
}
.auth-form .form-group {
  margin-bottom: var(--space-5);
}
.auth-divider {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  margin: var(--space-6) 0;
  color: var(--text-tertiary);
  font-size: var(--text-sm);
}
.auth-divider::before, .auth-divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border-primary);
}
.social-login {
  display: flex;
  gap: var(--space-3);
}
.social-btn {
  flex: 1;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  color: var(--text-primary);
  transition: all var(--duration-normal) var(--ease-out);
}
.social-btn:hover { background: var(--bg-hover); }
.auth-footer {
  margin-top: var(--space-8);
  text-align: center;
  font-size: var(--text-sm);
  color: var(--text-secondary);
}

/* ============================================
   Page: AI Chat
   ============================================ */
.chat-layout {
  display: flex;
  height: calc(100vh - var(--topbar-height));
}
.chat-sidebar {
  width: 280px;
  border-right: 1px solid var(--border-primary);
  display: flex;
  flex-direction: column;
}
.chat-sidebar-header {
  padding: var(--space-4);
  border-bottom: 1px solid var(--border-primary);
}
.chat-list {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-2);
}
.chat-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background var(--duration-normal) var(--ease-out);
  margin-bottom: 2px;
}
.chat-item:hover { background: var(--bg-hover); }
.chat-item.active { background: var(--accent-light); }
.chat-item-title {
  font-size: var(--text-sm);
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.chat-item-preview {
  font-size: var(--text-xs);
  color: var(--text-tertiary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.chat-main {
  flex: 1;
  display: flex;
  flex-direction: column;
}
.chat-header {
  padding: var(--space-4) var(--space-6);
  border-bottom: 1px solid var(--border-primary);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}
.chat-message {
  display: flex;
  gap: var(--space-3);
  max-width: 80%;
  animation: fadeIn var(--duration-slow) var(--ease-out);
}
.chat-message.user {
  align-self: flex-end;
  flex-direction: row-reverse;
}
.chat-message-avatar {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-full);
  background: var(--bg-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.chat-message.user .chat-message-avatar {
  background: var(--accent);
  color: #fff;
}
.chat-message-content {
  background: var(--bg-muted);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-lg);
  font-size: var(--text-sm);
  line-height: 1.6;
}
.chat-message.user .chat-message-content {
  background: var(--accent);
  color: #fff;
}
.chat-input-area {
  padding: var(--space-4) var(--space-6);
  border-top: 1px solid var(--border-primary);
}
.chat-input-wrapper {
  display: flex;
  align-items: flex-end;
  gap: var(--space-3);
  background: var(--bg-muted);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  padding: var(--space-3);
  transition: border-color var(--duration-normal) var(--ease-out);
}
.chat-input-wrapper:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-light);
}
.chat-input {
  flex: 1;
  min-height: 24px;
  max-height: 120px;
  resize: none;
  font-size: var(--text-sm);
  line-height: 1.5;
  color: var(--text-primary);
  background: transparent;
}

/* ============================================
   Page: AI Design
   ============================================ */
.design-workspace {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: var(--space-6);
  height: calc(100vh - var(--topbar-height) - var(--space-16));
}
.design-panel {
  background: var(--bg-surface);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  overflow-y: auto;
}
.design-canvas {
  background: var(--bg-surface);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}
.upload-zone {
  border: 2px dashed var(--border-primary);
  border-radius: var(--radius-lg);
  padding: var(--space-10);
  text-align: center;
  cursor: pointer;
  transition: all var(--duration-normal) var(--ease-out);
}
.upload-zone:hover {
  border-color: var(--accent);
  background: var(--accent-light);
}
.upload-icon {
  width: 48px;
  height: 48px;
  margin: 0 auto var(--space-4);
  color: var(--text-tertiary);
}
.upload-text {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  margin-bottom: var(--space-2);
}
.upload-hint {
  font-size: var(--text-xs);
  color: var(--text-tertiary);
}

/* --- Design Result Gallery --- */
.design-gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-4);
}
.design-result-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--duration-normal) var(--ease-out);
}
.design-result-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}
.design-result-image {
  aspect-ratio: 4/3;
  background: var(--bg-muted);
  display: flex;
  align-items: center;
  justify-content: center;
}
.design-result-info {
  padding: var(--space-4);
}
.design-result-title {
  font-size: var(--text-sm);
  font-weight: 600;
  margin-bottom: var(--space-1);
}
.design-result-meta {
  font-size: var(--text-xs);
  color: var(--text-tertiary);
}

/* ============================================
   Page: Mall / Shop
   ============================================ */
.shop-layout {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: var(--space-6);
}
.shop-filters {
  background: var(--bg-surface);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  height: fit-content;
  position: sticky;
  top: calc(var(--topbar-height) + var(--space-8));
}
.filter-group {
  margin-bottom: var(--space-5);
}
.filter-title {
  font-size: var(--text-sm);
  font-weight: 600;
  margin-bottom: var(--space-3);
}
.filter-options {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.filter-option {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--text-secondary);
  cursor: pointer;
  padding: var(--space-1) 0;
}
.filter-option:hover { color: var(--text-primary); }
.filter-checkbox {
  width: 16px;
  height: 16px;
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
}
.filter-checkbox.checked {
  background: var(--accent);
  border-color: var(--accent);
}

.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: var(--space-4);
}
.product-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--duration-normal) var(--ease-out);
}
.product-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}
.product-image {
  aspect-ratio: 1;
  background: var(--bg-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}
.product-badge {
  position: absolute;
  top: var(--space-3);
  left: var(--space-3);
}
.product-info {
  padding: var(--space-4);
}
.product-name {
  font-size: var(--text-sm);
  font-weight: 500;
  margin-bottom: var(--space-1);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.product-brand {
  font-size: var(--text-xs);
  color: var(--text-tertiary);
  margin-bottom: var(--space-2);
}
.product-price {
  font-size: var(--text-lg);
  font-weight: 700;
}
.product-price-original {
  font-size: var(--text-sm);
  color: var(--text-tertiary);
  text-decoration: line-through;
  margin-left: var(--space-2);
}

/* ============================================
   Page: Community / Feed
   ============================================ */
.feed-layout {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: var(--space-6);
  max-width: 1000px;
  margin: 0 auto;
}
.feed-main {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}
.post-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
}
.post-header {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}
.post-author-name {
  font-size: var(--text-sm);
  font-weight: 600;
}
.post-time {
  font-size: var(--text-xs);
  color: var(--text-tertiary);
}
.post-content {
  font-size: var(--text-sm);
  line-height: 1.7;
  margin-bottom: var(--space-4);
}
.post-images {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}
.post-image {
  aspect-ratio: 1;
  background: var(--bg-muted);
  border-radius: var(--radius-md);
}
.post-actions {
  display: flex;
  gap: var(--space-6);
}
.post-action {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--text-secondary);
  cursor: pointer;
  transition: color var(--duration-normal) var(--ease-out);
}
.post-action:hover { color: var(--text-primary); }

.feed-sidebar {
  position: sticky;
  top: calc(var(--topbar-height) + var(--space-8));
  height: fit-content;
}
.trending-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  margin-bottom: var(--space-4);
}
.trending-title {
  font-size: var(--text-sm);
  font-weight: 600;
  margin-bottom: var(--space-4);
}
.trending-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) 0;
}
.trending-rank {
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--text-tertiary);
  width: 20px;
}
.trending-text {
  font-size: var(--text-sm);
  flex: 1;
}

/* ============================================
   Page: Admin
   ============================================ */
.admin-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-4);
  margin-bottom: var(--space-8);
}
.admin-chart-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  margin-bottom: var(--space-6);
}
.chart-placeholder {
  height: 300px;
  background: var(--bg-muted);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-tertiary);
}

/* ============================================
   Page: Error (404/500)
   ============================================ */
.error-page {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--space-8);
}
.error-code {
  font-size: 8rem;
  font-weight: 800;
  letter-spacing: -0.05em;
  line-height: 1;
  color: var(--text-primary);
  margin-bottom: var(--space-4);
}
.error-title {
  font-size: var(--text-2xl);
  font-weight: 600;
  margin-bottom: var(--space-3);
}
.error-desc {
  font-size: var(--text-base);
  color: var(--text-secondary);
  margin-bottom: var(--space-8);
  max-width: 400px;
}

/* ============================================
   Page: Profile / Settings
   ============================================ */
.profile-layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: var(--space-6);
}
.profile-sidebar {
  background: var(--bg-surface);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  height: fit-content;
}
.profile-avatar-section {
  text-align: center;
  padding-bottom: var(--space-5);
  border-bottom: 1px solid var(--border-primary);
  margin-bottom: var(--space-5);
}
.profile-avatar {
  width: 80px;
  height: 80px;
  border-radius: var(--radius-full);
  background: var(--bg-muted);
  margin: 0 auto var(--space-3);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--text-secondary);
}
.profile-name {
  font-size: var(--text-lg);
  font-weight: 600;
}
.profile-email {
  font-size: var(--text-sm);
  color: var(--text-tertiary);
}
.profile-menu-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-sm);
  color: var(--text-secondary);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--duration-normal) var(--ease-out);
  margin-bottom: 2px;
}
.profile-menu-item:hover { background: var(--bg-hover); color: var(--text-primary); }
.profile-menu-item.active { background: var(--accent-light); color: var(--accent-text); font-weight: 500; }

.settings-section {
  background: var(--bg-surface);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  margin-bottom: var(--space-4);
}
.settings-title {
  font-size: var(--text-lg);
  font-weight: 600;
  margin-bottom: var(--space-5);
}
.settings-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) 0;
  border-bottom: 1px solid var(--border-secondary);
}
.settings-row:last-child { border-bottom: none; }
.settings-label {
  font-size: var(--text-sm);
  font-weight: 500;
}
.settings-desc {
  font-size: var(--text-xs);
  color: var(--text-tertiary);
  margin-top: var(--space-1);
}

/* Toggle Switch */
.toggle {
  width: 40px;
  height: 22px;
  background: var(--bg-active);
  border-radius: var(--radius-full);
  position: relative;
  cursor: pointer;
  transition: background var(--duration-normal) var(--ease-out);
}
.toggle.active { background: var(--accent); }
.toggle::after {
  content: '';
  position: absolute;
  top: 2px;
  left: 2px;
  width: 18px;
  height: 18px;
  background: #fff;
  border-radius: var(--radius-full);
  transition: transform var(--duration-normal) var(--ease-out);
}
.toggle.active::after { transform: translateX(18px); }

/* ============================================
   Page: Orders / Payment
   ============================================ */
.order-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  margin-bottom: var(--space-4);
}
.order-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-4);
  border-bottom: 1px solid var(--border-secondary);
}
.order-id {
  font-size: var(--text-sm);
  font-weight: 600;
}
.order-items {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}
.order-item {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}
.order-item-image {
  width: 60px;
  height: 60px;
  background: var(--bg-muted);
  border-radius: var(--radius-md);
  flex-shrink: 0;
}
.order-item-name {
  font-size: var(--text-sm);
  font-weight: 500;
}
.order-item-qty {
  font-size: var(--text-xs);
  color: var(--text-tertiary);
}
.order-total {
  display: flex;
  justify-content: flex-end;
  margin-top: var(--space-4);
  padding-top: var(--space-4);
  border-top: 1px solid var(--border-secondary);
  font-size: var(--text-lg);
  font-weight: 700;
}

/* ============================================
   Page: Inspiration / Cases
   ============================================ */
.inspiration-grid {
  columns: 3;
  column-gap: var(--space-4);
}
.inspiration-item {
  break-inside: avoid;
  margin-bottom: var(--space-4);
  background: var(--bg-surface);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--duration-normal) var(--ease-out);
}
.inspiration-item:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}
.inspiration-image {
  width: 100%;
  background: var(--bg-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-tertiary);
  font-size: var(--text-sm);
}
.inspiration-info {
  padding: var(--space-4);
}
.inspiration-title {
  font-size: var(--text-sm);
  font-weight: 600;
  margin-bottom: var(--space-1);
}
.inspiration-meta {
  font-size: var(--text-xs);
  color: var(--text-tertiary);
}

/* ============================================
   Page: Designer / Company
   ============================================ */
.designer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-5);
}
.designer-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  text-align: center;
  transition: all var(--duration-normal) var(--ease-out);
}
.designer-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}
.designer-avatar {
  width: 72px;
  height: 72px;
  border-radius: var(--radius-full);
  background: var(--bg-muted);
  margin: 0 auto var(--space-4);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--text-secondary);
}
.designer-name {
  font-size: var(--text-base);
  font-weight: 600;
  margin-bottom: var(--space-1);
}
.designer-specialty {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  margin-bottom: var(--space-3);
}
.designer-stats {
  display: flex;
  justify-content: center;
  gap: var(--space-6);
  padding-top: var(--space-4);
  border-top: 1px solid var(--border-secondary);
}
.designer-stat-value {
  font-size: var(--text-lg);
  font-weight: 700;
}
.designer-stat-label {
  font-size: var(--text-xs);
  color: var(--text-tertiary);
}

/* ============================================
   Page: Messages / Notifications
   ============================================ */
.messages-layout {
  display: grid;
  grid-template-columns: 360px 1fr;
  gap: 0;
  height: calc(100vh - var(--topbar-height) - var(--space-16));
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  overflow: hidden;
}
.messages-list {
  border-right: 1px solid var(--border-primary);
  overflow-y: auto;
}
.message-item {
  display: flex;
  gap: var(--space-3);
  padding: var(--space-4);
  border-bottom: 1px solid var(--border-secondary);
  cursor: pointer;
  transition: background var(--duration-normal) var(--ease-out);
}
.message-item:hover { background: var(--bg-hover); }
.message-item.active { background: var(--accent-light); }
.message-item.unread { background: var(--accent-light); }
.message-content {
  flex: 1;
  min-width: 0;
}
.message-sender {
  font-size: var(--text-sm);
  font-weight: 600;
  margin-bottom: 2px;
}
.message-preview {
  font-size: var(--text-xs);
  color: var(--text-tertiary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.message-time {
  font-size: var(--text-xs);
  color: var(--text-tertiary);
  flex-shrink: 0;
}
.message-detail {
  display: flex;
  flex-direction: column;
}
.message-detail-header {
  padding: var(--space-4) var(--space-6);
  border-bottom: 1px solid var(--border-primary);
  font-weight: 600;
}
.message-detail-body {
  flex: 1;
  padding: var(--space-6);
  overflow-y: auto;
}

/* ============================================
   Page: Help Center
   ============================================ */
.help-hero {
  text-align: center;
  padding: var(--space-16) 0 var(--space-10);
}
.help-search {
  max-width: 560px;
  margin: var(--space-6) auto 0;
  position: relative;
}
.help-search input {
  width: 100%;
  height: 48px;
  padding: 0 var(--space-4) 0 var(--space-12);
  background: var(--bg-surface);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  font-size: var(--text-base);
  transition: all var(--duration-normal) var(--ease-out);
}
.help-search input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-light);
}
.help-categories {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-5);
  margin-top: var(--space-10);
}
.help-category {
  background: var(--bg-surface);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  text-align: center;
  transition: all var(--duration-normal) var(--ease-out);
}
.help-category:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}
.help-category-icon {
  width: 44px;
  height: 44px;
  margin: 0 auto var(--space-4);
  background: var(--accent-light);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-text);
}
.help-category-title {
  font-size: var(--text-base);
  font-weight: 600;
  margin-bottom: var(--space-2);
}
.help-category-desc {
  font-size: var(--text-sm);
  color: var(--text-secondary);
}

/* ============================================
   Page: Budget / Project Management
   ============================================ */
.project-board {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-4);
}
.project-column {
  background: var(--bg-muted);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
}
.project-column-title {
  font-size: var(--text-sm);
  font-weight: 600;
  margin-bottom: var(--space-4);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.project-column-count {
  background: var(--bg-active);
  padding: 1px 8px;
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  color: var(--text-secondary);
}
.project-task {
  background: var(--bg-surface);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-md);
  padding: var(--space-3);
  margin-bottom: var(--space-2);
  cursor: pointer;
  transition: all var(--duration-normal) var(--ease-out);
}
.project-task:hover {
  box-shadow: var(--shadow-sm);
  transform: translateY(-1px);
}
.project-task-title {
  font-size: var(--text-sm);
  font-weight: 500;
  margin-bottom: var(--space-2);
}
.project-task-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.project-task-date {
  font-size: var(--text-xs);
  color: var(--text-tertiary);
}

/* Budget */
.budget-overview {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-4);
  margin-bottom: var(--space-8);
}
.budget-item {
  background: var(--bg-surface);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
}
.budget-label {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  margin-bottom: var(--space-2);
}
.budget-amount {
  font-size: var(--text-2xl);
  font-weight: 700;
}
.budget-bar {
  height: 6px;
  background: var(--bg-muted);
  border-radius: var(--radius-full);
  margin-top: var(--space-3);
  overflow: hidden;
}
.budget-bar-fill {
  height: 100%;
  border-radius: var(--radius-full);
  transition: width var(--duration-slow) var(--ease-out);
}

/* ============================================
   View Management (SPA Routing)
   ============================================ */
.view {
  display: none;
  animation: fadeIn var(--duration-slow) var(--ease-out);
}
.view.active {
  display: block;
}
.view-auth { display: none; }
.view-auth.active { display: block; }

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 1024px) {
  .features-grid, .testimonials-grid, .help-categories { grid-template-columns: repeat(2, 1fr); }
  .grid-4, .admin-stats, .project-board { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
  .inspiration-grid { columns: 2; }
  .design-workspace { grid-template-columns: 1fr; }
  .shop-layout { grid-template-columns: 1fr; }
  .shop-filters { position: static; }
  .profile-layout { grid-template-columns: 1fr; }
  .feed-layout { grid-template-columns: 1fr; }
  .feed-sidebar { display: none; }
  .messages-layout { grid-template-columns: 1fr; }
  .message-detail { display: none; }
}

@media (max-width: 768px) {
  :root {
    --sidebar-width: 0px;
  }
  .sidebar {
    transform: translateX(-100%);
  }
  .sidebar.open {
    transform: translateX(0);
    width: 280px;
    box-shadow: var(--shadow-xl);
  }
  .main-content {
    margin-left: 0;
    padding: var(--space-4);
  }
  .hero-title { font-size: var(--text-4xl); }
  .hero-subtitle { font-size: var(--text-base); }
  .section-title { font-size: var(--text-2xl); }
  .features-grid, .testimonials-grid, .help-categories { grid-template-columns: 1fr; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .admin-stats, .budget-overview, .project-board { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; gap: var(--space-3); text-align: center; }
  .inspiration-grid { columns: 1; }
  .auth-page { flex-direction: column; }
  .auth-right { display: none; }
  .topnav-links { display: none; }
  .hero-actions { flex-direction: column; }
  .chat-sidebar { display: none; }
  .designer-grid { grid-template-columns: 1fr; }
  .product-grid { grid-template-columns: repeat(2, 1fr); }
  .container { padding: 0 var(--space-4); }
  .page-title { font-size: var(--text-2xl); }
}

@media (max-width: 480px) {
  .product-grid { grid-template-columns: 1fr; }
  .hero { padding: var(--space-12) 0; }
  .section { padding: var(--space-12) 0; }
}

/* ============================================
   Theme Toggle Button
   ============================================ */
.theme-toggle {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  transition: all var(--duration-normal) var(--ease-out);
  cursor: pointer;
}
.theme-toggle:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

/* ============================================
   Language Selector
   ============================================ */
.lang-selector {
  position: relative;
}
.lang-btn {
  height: 36px;
  padding: 0 var(--space-3);
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background: var(--bg-primary);
  color: var(--text-secondary);
  font-size: var(--text-xs);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--duration-normal) var(--ease-out);
  letter-spacing: 0.5px;
  min-width: 42px;
}
.lang-btn:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
  border-color: var(--border-hover);
}
.lang-dropdown {
  position: absolute;
  top: calc(100% + var(--space-2));
  right: 0;
  min-width: 140px;
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  z-index: 1000;
  padding: var(--space-1);
  overflow: hidden;
}
.lang-option {
  display: block;
  width: 100%;
  padding: var(--space-2) var(--space-3);
  border: none;
  background: none;
  color: var(--text-secondary);
  font-size: var(--text-sm);
  text-align: left;
  cursor: pointer;
  border-radius: var(--radius-md);
  transition: all var(--duration-fast) var(--ease-out);
}
.lang-option:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

/* ============================================
   Mobile Menu Toggle
   ============================================ */
.mobile-menu-toggle {
  display: none;
  width: 36px;
  height: 36px;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  cursor: pointer;
}
@media (max-width: 768px) {
  .mobile-menu-toggle { display: flex; }
}

/* ============================================
   Dropdown
   ============================================ */
.dropdown {
  position: relative;
}
.dropdown-menu {
  position: absolute;
  top: calc(100% + 4px);
  right: 0;
  min-width: 180px;
  background: var(--bg-surface);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  padding: var(--space-1);
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-4px);
  transition: all var(--duration-normal) var(--ease-out);
  z-index: 200;
}
.dropdown.open .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.dropdown-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-sm);
  color: var(--text-secondary);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--duration-normal) var(--ease-out);
}
.dropdown-item:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}
.dropdown-divider {
  height: 1px;
  background: var(--border-primary);
  margin: var(--space-1) 0;
}

/* ============================================
   Progress Bar
   ============================================ */
.progress {
  height: 6px;
  background: var(--bg-muted);
  border-radius: var(--radius-full);
  overflow: hidden;
}
.progress-bar {
  height: 100%;
  background: var(--accent);
  border-radius: var(--radius-full);
  transition: width var(--duration-slow) var(--ease-out);
}

/* ============================================
   Empty State
   ============================================ */
.empty-state {
  text-align: center;
  padding: var(--space-16) var(--space-8);
}
.empty-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto var(--space-5);
  color: var(--text-tertiary);
}
.empty-title {
  font-size: var(--text-lg);
  font-weight: 600;
  margin-bottom: var(--space-2);
}
.empty-desc {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  margin-bottom: var(--space-6);
}

/* ============================================
   Notification Dot
   ============================================ */
.notification-dot {
  width: 8px;
  height: 8px;
  background: var(--error);
  border-radius: var(--radius-full);
  position: absolute;
  top: 6px;
  right: 6px;
}

/* ============================================
   Welcome Modal
   ============================================ */

/* Overlay */
.welcome-modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.55);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  opacity: 0;
  visibility: hidden;
  transition: opacity 300ms cubic-bezier(0.16, 1, 0.3, 1), visibility 300ms;
  padding: var(--space-4);
}

.welcome-modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.welcome-modal-overlay.closing {
  opacity: 0;
  transition: opacity 250ms cubic-bezier(0.16, 1, 0.3, 1), visibility 250ms;
}

/* Modal Container */
.welcome-modal {
  position: relative;
  width: 100%;
  max-width: 700px;
  max-height: 90vh;
  background: var(--bg-surface);
  border: 1px solid var(--border-primary);
  border-radius: 16px;
  box-shadow:
    0 0 0 1px rgba(0, 0, 0, 0.03),
    0 2px 4px rgba(0, 0, 0, 0.04),
    0 12px 24px rgba(0, 0, 0, 0.06),
    0 32px 64px rgba(0, 0, 0, 0.08);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transform: scale(0.95) translateY(8px);
  transition: transform 300ms cubic-bezier(0.16, 1, 0.3, 1);
}

.welcome-modal-overlay.active .welcome-modal {
  transform: scale(1) translateY(0);
}

.welcome-modal-overlay.closing .welcome-modal {
  transform: scale(0.95) translateY(8px);
  transition: transform 250ms cubic-bezier(0.16, 1, 0.3, 1);
}

/* Close Button */
.welcome-modal-close {
  position: absolute;
  top: 16px;
  right: 16px;
  z-index: 10;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: none;
  background: var(--bg-muted);
  border-radius: 8px;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 150ms;
}

.welcome-modal-close:hover {
  background: var(--bg-active);
  color: var(--text-primary);
}

.welcome-modal-close svg {
  width: 16px;
  height: 16px;
}

/* Modal Body (scrollable) */
.welcome-modal-body {
  flex: 1;
  overflow-y: auto;
  padding: 40px 40px 24px;
  text-align: center;
}

/* Logo */
.welcome-modal-logo {
  width: 56px;
  height: 56px;
  margin: 0 auto 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-light);
  border-radius: 14px;
  color: var(--accent);
}

.welcome-modal-logo svg {
  width: 32px;
  height: 32px;
}

/* Title */
.welcome-modal-title {
  font-size: 24px;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.3;
  margin-bottom: 8px;
  letter-spacing: -0.02em;
}

/* Subtitle */
.welcome-modal-subtitle {
  font-size: 15px;
  color: var(--text-secondary);
  margin-bottom: 24px;
  line-height: 1.5;
}

/* Introduction */
.welcome-modal-intro {
  text-align: left;
  background: var(--bg-muted);
  border-radius: 12px;
  padding: 20px 24px;
  margin-bottom: 24px;
}

.welcome-modal-intro > p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 12px;
}

.welcome-modal-features-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px 16px;
}

.welcome-modal-features-list li {
  font-size: 13px;
  color: var(--text-primary);
  line-height: 1.5;
  padding-left: 20px;
  position: relative;
}

.welcome-modal-features-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 6px;
  width: 14px;
  height: 14px;
  background: var(--success);
  border-radius: 50%;
  mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='20 6 9 17 4 12'/%3E%3C/svg%3E");
  -webkit-mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='20 6 9 17 4 12'/%3E%3C/svg%3E");
  mask-size: contain;
  -webkit-mask-size: contain;
}

/* Feature Cards Grid */
.welcome-modal-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 8px;
}

.welcome-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-primary);
  border-radius: 12px;
  padding: 20px 16px;
  text-align: center;
  transition: all 150ms;
}

.welcome-card:hover {
  border-color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent), 0 4px 12px rgba(37, 99, 235, 0.08);
  transform: translateY(-1px);
}

.welcome-card-icon {
  width: 40px;
  height: 40px;
  margin: 0 auto 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-light);
  border-radius: 10px;
  color: var(--accent);
}

.welcome-card-icon svg {
  width: 22px;
  height: 22px;
}

.welcome-card h3 {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.welcome-card p {
  font-size: 12px;
  color: var(--text-secondary);
  line-height: 1.4;
  margin: 0;
}

/* Footer */
.welcome-modal-footer {
  padding: 16px 40px 24px;
  border-top: 1px solid var(--border-primary);
  background: var(--bg-surface);
}

.welcome-modal-checkbox {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 16px;
  cursor: pointer;
  font-size: 13px;
  color: var(--text-secondary);
  user-select: none;
}

.welcome-modal-checkbox input[type="checkbox"] {
  width: 16px;
  height: 16px;
  accent-color: var(--accent);
  cursor: pointer;
  border-radius: 4px;
}

.welcome-modal-actions {
  display: flex;
  gap: 12px;
}

.welcome-modal-actions .btn {
  flex: 1;
  padding: 10px 20px;
  font-size: 14px;
  font-weight: 500;
  border-radius: 10px;
  cursor: pointer;
  transition: all 150ms;
  border: none;
  text-align: center;
}

.welcome-modal-actions .btn-secondary {
  background: var(--bg-muted);
  color: var(--text-primary);
  border: 1px solid var(--border-primary);
}

.welcome-modal-actions .btn-secondary:hover {
  background: var(--bg-active);
}

.welcome-modal-actions .btn-primary {
  background: var(--accent);
  color: #fff;
}

.welcome-modal-actions .btn-primary:hover {
  background: var(--accent-hover);
}

.welcome-modal-actions .btn:active {
  transform: scale(0.98);
}

/* ---- Responsive: Tablet ---- */
@media (max-width: 768px) {
  .welcome-modal {
    max-width: 95%;
    max-height: 95vh;
  }

  .welcome-modal-body {
    padding: 32px 24px 16px;
  }

  .welcome-modal-title {
    font-size: 20px;
  }

  .welcome-modal-features-list {
    grid-template-columns: 1fr;
  }

  .welcome-modal-cards {
    grid-template-columns: 1fr 1fr;
    gap: 8px;
  }

  .welcome-modal-footer {
    padding: 12px 24px 20px;
  }

  .welcome-modal-actions {
    flex-direction: column;
  }
}

/* ---- Responsive: Mobile ---- */
@media (max-width: 480px) {
  .welcome-modal-overlay {
    padding: var(--space-3);
  }

  .welcome-modal {
    max-width: 100%;
    border-radius: 12px;
  }

  .welcome-modal-body {
    padding: 28px 16px 12px;
  }

  .welcome-modal-title {
    font-size: 18px;
  }

  .welcome-modal-subtitle {
    font-size: 13px;
  }

  .welcome-modal-intro {
    padding: 16px;
  }

  .welcome-modal-cards {
    grid-template-columns: 1fr;
  }

  .welcome-card {
    padding: 16px 12px;
    display: flex;
    align-items: center;
    gap: 12px;
    text-align: left;
  }

  .welcome-card-icon {
    margin: 0;
    flex-shrink: 0;
  }

  .welcome-modal-footer {
    padding: 12px 16px 16px;
  }
}

/* ---- Dark mode overrides ---- */
[data-theme="dark"] .welcome-modal {
  background: #18181B;
  border-color: #27272A;
  box-shadow:
    0 0 0 1px rgba(255, 255, 255, 0.03),
    0 2px 4px rgba(0, 0, 0, 0.2),
    0 12px 24px rgba(0, 0, 0, 0.3),
    0 32px 64px rgba(0, 0, 0, 0.4);
}

[data-theme="dark"] .welcome-modal-close {
  background: #27272A;
  color: #A1A1AA;
}

[data-theme="dark"] .welcome-modal-close:hover {
  background: #3F3F46;
  color: #FAFAFA;
}

[data-theme="dark"] .welcome-modal-intro {
  background: #1F1F23;
}

[data-theme="dark"] .welcome-card {
  background: #1F1F23;
  border-color: #27272A;
}

[data-theme="dark"] .welcome-card:hover {
  border-color: var(--accent);
}

[data-theme="dark"] .welcome-modal-footer {
  background: #18181B;
  border-top-color: #27272A;
}

[data-theme="dark"] .welcome-modal-actions .btn-secondary {
  background: #27272A;
  color: #FAFAFA;
  border-color: #3F3F46;
}

[data-theme="dark"] .welcome-modal-actions .btn-secondary:hover {
  background: #3F3F46;
}