/* ═══════════════════════════════════════════════════════
   DETAILER AI — Design System (Global)
   Source of truth: design-system/detailer-ai/MASTER.md
   ═══════════════════════════════════════════════════════ */

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

/* ─── CSS VARIABLES ─── */
:root {
  /* Backgrounds */
  --bg-deep: #000000;
  --bg-primary: #0A0A0A;
  --bg-elevated: #141414;
  --bg-card: rgba(20, 20, 20, 0.7);
  --bg-card-hover: rgba(30, 30, 30, 0.85);

  /* Text */
  --text-primary: #F5F5F5;
  --text-secondary: rgba(245, 245, 245, 0.6);
  --text-muted: rgba(245, 245, 245, 0.35);

  /* Borders */
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-accent: rgba(202, 170, 90, 0.3);

  /* Accent: Warm Gold */
  --accent-primary: #C9A84C;
  --accent-light: #DFC06E;
  --accent-subtle: rgba(201, 168, 76, 0.15);

  /* Gradients */
  --gradient-accent: linear-gradient(135deg, #C9A84C 0%, #DFC06E 100%);
  --gradient-subtle: linear-gradient(135deg, rgba(201,168,76,0.12) 0%, rgba(201,168,76,0.04) 100%);
  --gradient-surface: linear-gradient(180deg, #0A0A0A 0%, #000000 100%);

  /* Semantic */
  --color-success: #22C55E;
  --color-warning: #EAB308;
  --color-error: #EF4444;

  /* Typography */
  --font-display: 'Space Grotesk', sans-serif;
  --font-body: 'DM Sans', sans-serif;

  /* Type Scale */
  --text-hero: clamp(40px, 6vw, 76px);
  --text-display: clamp(32px, 4vw, 52px);
  --text-h3: 22px;
  --text-h4: 18px;
  --text-body: 16px;
  --text-body-sm: 15px;
  --text-caption: 14px;
  --text-overline: 12px;

  /* Line Heights */
  --leading-tight: 1.05;
  --leading-snug: 1.1;
  --leading-normal: 1.6;
  --leading-relaxed: 1.7;

  /* Letter Spacing */
  --tracking-tight: -2px;
  --tracking-snug: -1.5px;
  --tracking-normal: 0;
  --tracking-wide: 3px;

  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --space-3xl: 64px;

  /* Shadows (Dark Theme) */
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
  --shadow-lg: 0 10px 24px rgba(0,0,0,0.5);
  --shadow-xl: 0 20px 40px rgba(0,0,0,0.6);
  --shadow-gold: 0 8px 30px rgba(201, 168, 76, 0.3);

  /* Easing */
  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
}

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

body {
  font-family: var(--font-body);
  background: var(--bg-deep);
  color: var(--text-primary);
  overflow-x: hidden;
  line-height: var(--leading-normal);
}

/* ─── LAYOUT UTILITIES ─── */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.section-spacer {
  padding: 120px 0;
}

/* ─── BUTTONS ─── */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 16px 36px;
  background: var(--accent-primary);
  color: #000000;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--text-body-sm);
  letter-spacing: 0.5px;
  border: none;
  border-radius: 100px;
  cursor: pointer;
  text-decoration: none;
  transition: all 200ms ease;
  position: relative;
  overflow: hidden;
}

.btn-primary::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.2) 0%, transparent 50%);
  opacity: 0;
  transition: opacity 200ms ease;
}

.btn-primary:hover {
  background: var(--accent-light);
  transform: translateY(-2px);
  box-shadow: var(--shadow-gold);
}

.btn-primary:hover::before {
  opacity: 1;
}

.btn-primary svg {
  transition: transform 200ms var(--ease-spring);
}

.btn-primary:hover svg {
  transform: translateX(3px);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 16px 32px;
  background: transparent;
  color: var(--text-secondary);
  font-family: var(--font-display);
  font-weight: 500;
  font-size: var(--text-body-sm);
  border: 1px solid var(--border-subtle);
  border-radius: 100px;
  cursor: pointer;
  text-decoration: none;
  transition: all 200ms ease;
}

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

/* ─── SECTION HEADERS ─── */
.section-label {
  font-family: var(--font-display);
  font-size: var(--text-overline);
  font-weight: 600;
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--accent-primary);
  margin-bottom: var(--space-md);
}

.section-title {
  font-family: var(--font-display);
  font-size: var(--text-display);
  font-weight: 800;
  letter-spacing: var(--tracking-snug);
  line-height: var(--leading-snug);
  margin-bottom: 20px;
}

.section-desc {
  font-size: 17px;
  color: var(--text-secondary);
  max-width: 560px;
  line-height: var(--leading-relaxed);
}

/* ─── SCROLL ANIMATIONS ─── */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s var(--ease-out-expo), transform 0.7s var(--ease-out-expo);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.35s; }
.reveal-delay-5 { transition-delay: 0.4s; }

/* ─── GRADIENT TEXT ─── */
.gradient-text {
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ─── ACCESSIBILITY: REDUCED MOTION ─── */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }

  html {
    scroll-behavior: auto;
  }
}