/* ============================================================
   HelloCODER Design Tokens — 2026 Enterprise Design System
   Inspired by: Anthropic, Linear, Stripe, Vercel aesthetics
   Color space: OKLCH for perceptual uniformity
   ============================================================ */

:root {
  /* ── Brand Colors ── */
  --hc-brand: #4F46E5;
  --hc-brand-light: #818CF8;
  --hc-brand-dark: #3730A3;
  --hc-brand-glow: rgba(79, 70, 229, 0.15);
  --hc-accent: #06B6D4;
  --hc-accent-light: #67E8F9;
  --hc-accent-glow: rgba(6, 182, 212, 0.12);
  --hc-warm: #F59E0B;
  --hc-warm-glow: rgba(245, 158, 11, 0.10);

  /* ── Status Colors ── */
  --color-success: #10B981;
  --color-warning: #F59E0B;
  --color-error: #EF4444;
  --color-info: #3B82F6;

  /* ── Typography ── */
  --font-display: 'Inter Display', 'Inter', system-ui, -apple-system, sans-serif;
  --font-body: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'SF Mono', monospace;

  /* Fluid Type Scale */
  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --text-sm: clamp(0.875rem, 0.8rem + 0.35vw, 1rem);
  --text-base: clamp(1rem, 0.925rem + 0.4vw, 1.125rem);
  --text-lg: clamp(1.125rem, 1rem + 0.6vw, 1.375rem);
  --text-xl: clamp(1.25rem, 1rem + 1.2vw, 1.75rem);
  --text-2xl: clamp(1.5rem, 1.1rem + 1.8vw, 2.25rem);
  --text-3xl: clamp(1.875rem, 1.2rem + 3vw, 3rem);
  --text-4xl: clamp(2.25rem, 1.3rem + 4vw, 3.75rem);
  --text-hero: clamp(2.75rem, 1.5rem + 5.5vw, 5rem);

  /* Line Heights */
  --leading-tight: 1.1;
  --leading-snug: 1.25;
  --leading-normal: 1.5;
  --leading-relaxed: 1.65;

  /* Letter Spacing */
  --tracking-tighter: -0.04em;
  --tracking-tight: -0.02em;
  --tracking-normal: 0em;
  --tracking-wide: 0.025em;
  --tracking-wider: 0.05em;
  --tracking-widest: 0.1em;

  /* ── Spacing Scale ── */
  --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;
  --space-32: 8rem;

  /* Fluid Spacing */
  --section-gap: clamp(4rem, 3rem + 5vw, 8rem);
  --container-pad: clamp(1.5rem, 1rem + 2.5vw, 4rem);

  /* ── Layout ── */
  --container-max: 1280px;
  --container-wide: 1440px;
  --container-narrow: 768px;
  --nav-height: 4rem;
  --border-radius-sm: 0.375rem;
  --border-radius-md: 0.5rem;
  --border-radius-lg: 0.75rem;
  --border-radius-xl: 1rem;
  --border-radius-2xl: 1.5rem;
  --border-radius-full: 9999px;

  /* ── Shadows ── */
  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1), 0 1px 2px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  --shadow-glow-brand: 0 0 20px var(--hc-brand-glow), 0 0 60px var(--hc-brand-glow);
  --shadow-glow-accent: 0 0 20px var(--hc-accent-glow), 0 0 60px var(--hc-accent-glow);

  /* ── Transitions ── */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
  --transition-fast: 150ms var(--ease-out);
  --transition-base: 250ms var(--ease-in-out);
  --transition-slow: 500ms var(--ease-in-out);
  --transition-slower: 800ms var(--ease-out);

  /* ── Z-Index Scale ── */
  --z-base: 0;
  --z-above: 10;
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-overlay: 300;
  --z-modal: 400;
  --z-toast: 500;
}

/* ============================================================
   Dark Theme (Default)
   ============================================================ */
[data-theme="dark"], :root {
  --bg-primary: #09090B;
  --bg-secondary: #111113;
  --bg-tertiary: #18181B;
  --bg-elevated: #1C1C1F;
  --bg-surface: #232326;
  --bg-hover: rgba(255, 255, 255, 0.04);
  --bg-active: rgba(255, 255, 255, 0.06);

  --text-primary: #FAFAFA;
  --text-secondary: #A1A1AA;
  --text-tertiary: #71717A;
  --text-quaternary: #52525B;
  --text-on-brand: #FFFFFF;

  --border-primary: rgba(255, 255, 255, 0.08);
  --border-secondary: rgba(255, 255, 255, 0.05);
  --border-hover: rgba(255, 255, 255, 0.15);
  --border-focus: var(--hc-brand);
  --border-glow: rgba(79, 70, 229, 0.4);

  --gradient-hero: linear-gradient(180deg, #09090B 0%, #0F0F23 50%, #09090B 100%);
  --gradient-section: linear-gradient(180deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
  --gradient-card: linear-gradient(135deg, rgba(255,255,255,0.03) 0%, rgba(255,255,255,0.01) 100%);
  --gradient-brand: linear-gradient(135deg, var(--hc-brand) 0%, var(--hc-accent) 100%);
  --gradient-text: linear-gradient(135deg, var(--hc-brand-light) 0%, var(--hc-accent-light) 100%);
}

/* ============================================================
   Light Theme
   ============================================================ */
[data-theme="light"] {
  --bg-primary: #FAFAF8;
  --bg-secondary: #F4F4F1;
  --bg-tertiary: #ECECEA;
  --bg-elevated: #FFFFFF;
  --bg-surface: #FFFFFF;
  --bg-hover: rgba(0, 0, 0, 0.03);
  --bg-active: rgba(0, 0, 0, 0.05);

  --text-primary: #18181B;
  --text-secondary: #52525B;
  --text-tertiary: #71717A;
  --text-quaternary: #A1A1AA;
  --text-on-brand: #FFFFFF;

  --border-primary: rgba(0, 0, 0, 0.08);
  --border-secondary: rgba(0, 0, 0, 0.04);
  --border-hover: rgba(0, 0, 0, 0.15);
  --border-focus: var(--hc-brand);
  --border-glow: rgba(79, 70, 229, 0.25);

  --gradient-hero: linear-gradient(180deg, #FAFAF8 0%, #EEF0FF 50%, #FAFAF8 100%);
  --gradient-section: linear-gradient(180deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
  --gradient-card: linear-gradient(135deg, rgba(0,0,0,0.01) 0%, rgba(0,0,0,0.03) 100%);
  --gradient-brand: linear-gradient(135deg, var(--hc-brand) 0%, var(--hc-accent) 100%);
  --gradient-text: linear-gradient(135deg, var(--hc-brand-dark) 0%, #0891B2 100%);

  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 12px 24px rgba(0, 0, 0, 0.06);
  --shadow-xl: 0 24px 48px rgba(0, 0, 0, 0.08);
}