/* ============================================================================
   COMMON CSS — Premium Design System
   ============================================================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=Playfair+Display:wght@600;700;800&display=swap');

:root {
  /* Brand */
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --primary-light: #3b82f6;
  --primary-glow: rgba(37, 99, 235, 0.18);
  --accent: #8b5cf6;
  --accent-light: rgba(139, 92, 246, 0.12);
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;

  /* Surfaces */
  --bg: #fafafa;
  --bg-alt: #f4f6fa;
  --surface: #ffffff;
  --surface-2: #f8fafc;
  --surface-glass: rgba(255,255,255,0.75);
  --border: #e4e8f0;
  --border-light: rgba(228,232,240,0.6);

  /* Text */
  --text-1: #0f172a;
  --text-2: #475569;
  --text-3: #94a3b8;
  --text-inv: #ffffff;

  /* Shadows */
  --shadow-xs: 0 1px 2px rgba(15,23,42,0.05);
  --shadow-sm: 0 1px 3px rgba(15,23,42,0.08), 0 1px 2px rgba(15,23,42,0.04);
  --shadow-md: 0 4px 12px rgba(15,23,42,0.08), 0 2px 4px rgba(15,23,42,0.04);
  --shadow-lg: 0 12px 32px rgba(15,23,42,0.1), 0 4px 8px rgba(15,23,42,0.04);
  --shadow-xl: 0 24px 48px rgba(15,23,42,0.12), 0 8px 16px rgba(15,23,42,0.06);
  --shadow-glow: 0 0 0 3px var(--primary-glow);
  --shadow-card: 0 2px 8px rgba(15,23,42,0.06), 0 1px 3px rgba(15,23,42,0.04);
  --shadow-float: 0 20px 60px rgba(15,23,42,0.15), 0 8px 24px rgba(15,23,42,0.08);

  /* Spacing */
  --sp-1: 0.25rem;
  --sp-2: 0.5rem;
  --sp-3: 0.75rem;
  --sp-4: 1rem;
  --sp-5: 1.25rem;
  --sp-6: 1.5rem;
  --sp-8: 2rem;
  --sp-10: 2.5rem;
  --sp-12: 3rem;
  --sp-16: 4rem;
  --sp-20: 5rem;

  /* Radius */
  --r-sm: 6px;
  --r-md: 10px;
  --r-lg: 14px;
  --r-xl: 20px;
  --r-2xl: 28px;
  --r-full: 9999px;

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-display: 'Playfair Display', Georgia, serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  /* Transitions */
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-out: cubic-bezier(0, 0, 0.2, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --t-fast: 120ms var(--ease);
  --t-base: 200ms var(--ease);
  --t-slow: 350ms var(--ease);
  --t-spring: 400ms var(--ease-spring);
}

/* Dark mode */
body.dark-mode {
  --bg: #0a0f1e;
  --bg-alt: #111827;
  --surface: #1a2035;
  --surface-2: #1e2740;
  --surface-glass: rgba(26,32,53,0.85);
  --border: #2d3a55;
  --border-light: rgba(45,58,85,0.6);
  --text-1: #f1f5f9;
  --text-2: #94a3b8;
  --text-3: #64748b;
  --shadow-card: 0 2px 8px rgba(0,0,0,0.3), 0 1px 3px rgba(0,0,0,0.2);
  --shadow-float: 0 20px 60px rgba(0,0,0,0.4), 0 8px 24px rgba(0,0,0,0.25);
}

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

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text-1);
  font-size: 1rem;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background var(--t-base), color var(--t-base);
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--text-1);
}

p { margin-bottom: var(--sp-4); color: var(--text-2); }
a { color: var(--primary); text-decoration: none; transition: color var(--t-fast); }
a:hover { color: var(--primary-dark); }
img { max-width: 100%; display: block; }
button { font-family: inherit; }

/* ============================================================================
   BUTTONS
   ============================================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
  padding: var(--sp-3) var(--sp-5);
  border: none;
  border-radius: var(--r-md);
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  cursor: pointer;
  transition: all var(--t-base);
  white-space: nowrap;
  position: relative;
  overflow: hidden;
}

.btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(255,255,255,0);
  transition: background var(--t-fast);
}

.btn:hover::after { background: rgba(255,255,255,0.08); }
.btn:active { transform: scale(0.97); }
.btn:disabled { opacity: 0.45; cursor: not-allowed; pointer-events: none; }

.btn-primary {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 2px 8px rgba(37,99,235,0.3), 0 1px 3px rgba(37,99,235,0.2);
}
.btn-primary:hover {
  background: var(--primary-dark);
  box-shadow: 0 6px 20px rgba(37,99,235,0.35), 0 2px 6px rgba(37,99,235,0.2);
  transform: translateY(-1px);
  color: #fff;
}

.btn-secondary {
  background: var(--surface);
  color: var(--text-1);
  border: 1.5px solid var(--border);
  box-shadow: var(--shadow-xs);
}
.btn-secondary:hover {
  background: var(--bg-alt);
  border-color: var(--primary);
  color: var(--primary);
  box-shadow: var(--shadow-sm);
  transform: translateY(-1px);
}

.btn-ghost {
  background: transparent;
  color: var(--text-2);
  border: 1.5px solid transparent;
}
.btn-ghost:hover {
  background: var(--bg-alt);
  color: var(--text-1);
  border-color: var(--border);
}

.btn-lg {
  padding: var(--sp-4) var(--sp-8);
  font-size: 1.0625rem;
  border-radius: var(--r-lg);
}

.btn-sm {
  padding: var(--sp-2) var(--sp-4);
  font-size: 0.8125rem;
  border-radius: var(--r-sm);
}

.icon-btn {
  width: 38px;
  height: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: none;
  background: transparent;
  color: var(--text-2);
  cursor: pointer;
  border-radius: var(--r-md);
  transition: all var(--t-fast);
  flex-shrink: 0;
}
.icon-btn:hover {
  background: var(--bg-alt);
  color: var(--text-1);
}
.icon-btn:active { transform: scale(0.92); }

/* ============================================================================
   FORMS
   ============================================================================ */
.form-group { margin-bottom: var(--sp-5); }
.form-group:last-child { margin-bottom: 0; }

label {
  display: block;
  margin-bottom: var(--sp-2);
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-2);
  letter-spacing: 0.01em;
}

input[type="text"],
input[type="email"],
input[type="tel"],
input[type="url"],
textarea,
select {
  width: 100%;
  padding: var(--sp-3) var(--sp-4);
  border: 1.5px solid var(--border);
  border-radius: var(--r-md);
  background: var(--surface);
  color: var(--text-1);
  font-family: var(--font-sans);
  font-size: 0.9rem;
  line-height: 1.5;
  transition: border-color var(--t-fast), box-shadow var(--t-fast), background var(--t-fast);
  appearance: none;
}

input:focus,
textarea:focus,
select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-glow);
  background: var(--surface);
}

input::placeholder, textarea::placeholder { color: var(--text-3); }

textarea { resize: vertical; min-height: 72px; }

select {
  cursor: pointer;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%2394a3b8' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right var(--sp-3) center;
  padding-right: var(--sp-8);
}

input[type="color"] {
  width: 44px;
  height: 38px;
  padding: 3px;
  border: 1.5px solid var(--border);
  border-radius: var(--r-md);
  cursor: pointer;
  background: var(--surface);
}

/* ============================================================================
   CONTAINERS
   ============================================================================ */
.container {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 var(--sp-8);
}

/* ============================================================================
   MODALS
   ============================================================================ */
.modal {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(10,15,30,0.6);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  z-index: 1000;
  align-items: center;
  justify-content: center;
  animation: fadeIn 200ms var(--ease);
}
.modal.active { display: flex; }

.modal-content {
  background: var(--surface);
  border-radius: var(--r-xl);
  box-shadow: var(--shadow-float);
  max-width: 520px;
  width: 90%;
  max-height: 90vh;
  overflow-y: auto;
  border: 1px solid var(--border-light);
  animation: slideInUp 250ms var(--ease-out);
}

.modal-header {
  padding: var(--sp-6) var(--sp-8);
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.modal-header h2 { margin: 0; font-size: 1.2rem; }

.close-btn {
  width: 32px;
  height: 32px;
  border: none;
  background: var(--bg-alt);
  color: var(--text-2);
  border-radius: var(--r-full);
  cursor: pointer;
  font-size: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--t-fast);
}
.close-btn:hover { background: var(--border); color: var(--text-1); }

.modal-body { padding: var(--sp-6) var(--sp-8); }

/* ============================================================================
   TOASTS
   ============================================================================ */
.toast-container {
  position: fixed;
  bottom: var(--sp-6);
  right: var(--sp-6);
  z-index: 2000;
  display: flex;
  flex-direction: column-reverse;
  gap: var(--sp-3);
  pointer-events: none;
}

.toast {
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 3px solid var(--primary);
  padding: var(--sp-3) var(--sp-5);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-lg);
  animation: toastIn 300ms var(--ease-spring);
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  font-size: 0.875rem;
  font-weight: 500;
  pointer-events: auto;
  min-width: 220px;
  max-width: 360px;
}
.toast.success { border-left-color: var(--success); }
.toast.error { border-left-color: var(--danger); }
.toast.warning { border-left-color: var(--warning); }
.toast-icon { font-size: 1rem; flex-shrink: 0; }

/* ============================================================================
   SCROLLBAR
   ============================================================================ */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: var(--r-full); }
::-webkit-scrollbar-thumb:hover { background: var(--text-3); }

/* ============================================================================
   KEYFRAMES
   ============================================================================ */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}
@keyframes slideInUp {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes slideInDown {
  from { opacity: 0; transform: translateY(-16px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes slideInRight {
  from { opacity: 0; transform: translateX(20px); }
  to { opacity: 1; transform: translateX(0); }
}
@keyframes toastIn {
  from { opacity: 0; transform: translateY(12px) scale(0.95); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}
@keyframes spin {
  to { transform: rotate(360deg); }
}
@keyframes shimmer {
  0% { background-position: -600px 0; }
  100% { background-position: 600px 0; }
}
@keyframes pulse-ring {
  0% { box-shadow: 0 0 0 0 var(--primary-glow); }
  70% { box-shadow: 0 0 0 10px transparent; }
  100% { box-shadow: 0 0 0 0 transparent; }
}

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

.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }
.hidden { display: none !important; }
.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.gap-2 { gap: var(--sp-2); }
.gap-4 { gap: var(--sp-4); }
.w-full { width: 100%; }
.relative { position: relative; }