/* ============================================================
   NEURPORT DESIGN SYSTEM v2 — Design Tokens
   Modern, clean, professional. Target: 7/10 design quality.
   
   Platform-level CSS custom properties for all projects.
   DO NOT hardcode colors/sizes — use these variables.
   ============================================================ */

:root {
  /* ── Typography — Modern font stack ── */
  --font-heading: 'Inter', 'Schibsted Grotesk', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-body: 'Source Sans Pro', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'IBM Plex Mono', 'JetBrains Mono', monospace;

  /* Fluid type scale — scales with viewport */
  --font-size-xs: clamp(0.7rem, 0.65rem + 0.25vw, 0.75rem);
  --font-size-sm: clamp(0.8rem, 0.75rem + 0.25vw, 0.875rem);
  --font-size-base: clamp(0.95rem, 0.9rem + 0.25vw, 1rem);
  --font-size-lg: clamp(1.05rem, 1rem + 0.25vw, 1.125rem);
  --font-size-xl: clamp(1.15rem, 1.05rem + 0.5vw, 1.25rem);
  --font-size-2xl: clamp(1.35rem, 1.2rem + 0.75vw, 1.5rem);
  --font-size-3xl: clamp(1.65rem, 1.4rem + 1.25vw, 1.875rem);
  --font-size-4xl: clamp(2rem, 1.6rem + 2vw, 2.25rem);
  --font-size-5xl: clamp(2.5rem, 1.8rem + 3.5vw, 3.5rem);
  --font-size-6xl: clamp(3rem, 2rem + 5vw, 4.5rem);

  --line-height-tight: 1.15;
  --line-height-snug: 1.3;
  --line-height-normal: 1.6;
  --line-height-relaxed: 1.75;

  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --font-weight-extrabold: 800;

  /* ── Letter spacing ── */
  --tracking-tight: -0.02em;
  --tracking-normal: 0;
  --tracking-wide: 0.02em;
  --tracking-wider: 0.05em;
  --tracking-widest: 0.1em;

  /* ── Colors: Brand (override in brand.css) ── */
  --color-primary: #2c5530;
  --color-primary-light: #3d7a44;
  --color-primary-dark: #1e3d22;
  --color-secondary: #84a59d;
  --color-accent: #f28482;

  /* ── Colors: Neutral ── */
  --color-bg: #faf9f7;
  --color-surface: #ffffff;
  --color-text: #1a1a2e;
  --color-text-muted: #6b7280;
  --color-text-light: #9ca3af;
  --color-border: #e8e6e3;
  --color-border-light: #f3f1ee;

  /* ── Colors: Semantic ── */
  --color-success: #16a34a;
  --color-warning: #d97706;
  --color-error: #dc2626;
  --color-info: #2563eb;

  /* ── Spacing — generous, modern scale ── */
  --space-0: 0;
  --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;

  /* ── Layout ── */
  --max-width: 1200px;
  --content-width: 720px;
  --wide-width: 960px;
  --header-height: 72px;
  --section-padding: clamp(4rem, 3rem + 5vw, 8rem);

  /* ── Border Radius ── */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-2xl: 32px;
  --radius-full: 9999px;

  /* ── Shadows — layered, subtle ── */
  --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(0,0,0,0.07), 0 2px 4px -2px rgba(0,0,0,0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.08), 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);
  --shadow-2xl: 0 25px 50px -12px rgba(0,0,0,0.15);
  --shadow-inner: inset 0 2px 4px rgba(0,0,0,0.04);
  --shadow-glow: 0 0 20px rgba(var(--color-primary-rgb, 44,85,48), 0.15);

  /* ── Transitions ── */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-spring: 500ms cubic-bezier(0.34, 1.56, 0.64, 1);

  /* ── Z-index scale ── */
  --z-base: 0;
  --z-dropdown: 50;
  --z-sticky: 100;
  --z-overlay: 200;
  --z-modal: 300;
  --z-toast: 400;

  /* ── Breakpoints (reference only, used in media queries) ── */
  /* sm: 640px, md: 768px, lg: 1024px, xl: 1280px, 2xl: 1536px */
}