:root {

  /* =========================================
     COLOR — CORE
  ========================================= */

  --color-white: #ffffff;
  --color-black: #000000;

  --color-neutral-0: #ffffff;
  --color-neutral-25: #fcfcfc;
  --color-neutral-50: #f8f8f8;
  --color-neutral-75: #f3f3f3;
  --color-neutral-100: #efefef;
  --color-neutral-150: #e6e6e6;
  --color-neutral-200: #dddddd;
  --color-neutral-300: #c7c7c7;
  --color-neutral-400: #a0a0a0;
  --color-neutral-500: #7a7a7a;
  --color-neutral-600: #5c5c5c;
  --color-neutral-700: #404040;
  --color-neutral-800: #262626;
  --color-neutral-900: #171717;
  --color-neutral-950: #0d0d0d;

  /* =========================================
     COLOR — SEMANTIC
  ========================================= */

  --color-bg-body: #ffffff;
  --color-bg-surface: #ffffff;
  --color-bg-surface-secondary: #fafafa;
  --color-bg-surface-tertiary: #f5f5f5;
  --color-bg-elevated: var(--color-white-strong);
  --color-bg-inverse: #111111;

  --color-text-strong: var(--color-bg-inverse);
  --color-text-primary: #171717;
  --color-text-secondary: #404040;
  --color-text-muted: #6a6a6a;
  --color-text-soft: #959595;
  --color-text-inverse: #ffffff;

  --color-border-soft: #efefef;
  --color-border-default: #e4e4e4;
  --color-border-strong: #d5d5d5;
  --color-border-inverse: rgba(255, 255, 255, 0.14);

  /* STATUS */

  --color-success-bg: #f1fbf4;
  --color-success-text: #146534;
  --color-success-border: #bce9c7;

  --color-error-bg: #fff4f4;
  --color-error-text: #9a2626;
  --color-error-border: #f4c7c7;

  --color-warning-bg: #fff9ee;
  --color-warning-text: #8b5b11;
  --color-warning-border: #efd38b;

  --color-info-bg: #f2f7ff;
  --color-info-text: #2456c7;
  --color-info-border: #c8dafd;

  /* OVERLAY */

  --color-overlay-soft: rgba(15, 15, 16, 0.04);
  --color-overlay-medium: rgba(15, 15, 16, 0.08);
  --color-overlay-strong: rgba(15, 15, 16, 0.16);

  /* ACCENT */

  --color-accent-soft: rgba(59, 130, 246, 0.9);
  --color-accent-muted: rgba(59, 130, 246, 0.6);

  /* SURFACE */

  --color-surface-subtle: rgba(0, 0, 0, 0.02);
  --color-surface-soft: rgba(0, 0, 0, 0.04);
  --color-surface-muted: rgba(0, 0, 0, 0.06);

  /* =========================================
     TYPOGRAPHY
  ========================================= */

  --font-heading: "Inter", "SF Pro Display", "Segoe UI", sans-serif;
  --font-body: "Inter", "SF Pro Text", "Segoe UI", sans-serif;
  --font-number: "Inter", "SF Pro Display", "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", monospace;

  --font-weight-regular: 400;
  --font-weight-medium: 500;
  --font-weight-semi-bold: 600;
  --font-weight-bold: 700;
  --font-weight-extra-bold: 800;

  /* STATIC SIZE */

  --text-3xs: 0.625rem;
  --text-2xs: 0.6875rem;
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-md: 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;
  --text-7xl: 4.5rem;
  --text-8xl: 6rem;
  --text-9xl: 7.5rem;

  /* =========================================
     FLUID TYPOGRAPHY (CORE SYSTEM)
  ========================================= */

  --text-fluid-2xs: clamp(0.6rem, 0.7vw, 0.7rem);
  --text-fluid-xs: clamp(0.7rem, 0.85vw, 0.8rem);
  --text-fluid-sm: clamp(0.8rem, 1vw, 0.95rem);
  --text-fluid-md: clamp(0.95rem, 1.2vw, 1.1rem);
  --text-fluid-lg: clamp(1.1rem, 1.6vw, 1.5rem);
  --text-fluid-xl: clamp(1.4rem, 2.5vw, 2.5rem);
  --text-fluid-2xl: clamp(1.8rem, 4vw, 3.5rem);
  --text-fluid-hero: clamp(2.8rem, 6vw, 6rem);

  /* =========================================
     LINE HEIGHT & TRACKING
  ========================================= */

  --line-height-tight: 1.04;
  --line-height-snug: 1.18;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.7;

  --tracking-tighter: -0.05em;
  --tracking-tight: -0.03em;
  --tracking-normal: 0;
  --tracking-wide: 0.03em;
  --tracking-wider: 0.08em;
  --tracking-widest: 0.14em;

  /* =========================================
     SPACING (FLUID)
  ========================================= */

  --space-1: clamp(0.2rem, 0.4vw, 0.3rem);
  --space-2: clamp(0.4rem, 0.6vw, 0.5rem);
  --space-3: clamp(0.6rem, 0.8vw, 0.75rem);
  --space-4: clamp(0.8rem, 1vw, 1rem);
  --space-5: clamp(1rem, 1.4vw, 1.25rem);
  --space-6: clamp(1.2rem, 1.8vw, 1.5rem);
  --space-8: clamp(1.6rem, 2.5vw, 2rem);
  --space-10: clamp(2rem, 3vw, 2.5rem);
  --space-12: clamp(2.5rem, 4vw, 3rem);
  --space-16: clamp(3rem, 5vw, 4rem);
  --space-20: clamp(4rem, 6vw, 5rem);

  /* =========================================
     RADIUS
  ========================================= */

  --radius-xs: 0.25rem;
  --radius-sm: 0.5rem;
  --radius-md: 0.875rem;
  --radius-lg: 1rem;
  --radius-xl: 1.25rem;
  --radius-full: 9999px;

  /* =========================================
     SHADOW
  ========================================= */

  --shadow-xs: 0 1px 2px rgba(15, 15, 16, 0.03);
  --shadow-sm: 0 4px 14px rgba(15, 15, 16, 0.05);
  --shadow-md: 0 10px 32px rgba(15, 15, 16, 0.07);
  --shadow-lg: 0 18px 52px rgba(15, 15, 16, 0.09);
  --shadow-xl: 0 28px 72px rgba(15, 15, 16, 0.11);

  /* =========================================
     MOTION
  ========================================= */

  --duration-fast: 120ms;
  --duration-normal: 180ms;
  --duration-slow: 260ms;
  --duration-xslow: 420ms;

  --ease-smooth: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-snappy: cubic-bezier(0.34, 1.56, 0.64, 1);

  /* =========================================
     EFFECT
  ========================================= */

  --opacity-muted: 0.72;
  --opacity-soft: 0.88;

  --blur-sm: 4px;
  --blur-md: 10px;
  --blur-lg: 18px;

  /* =========================================
     Z INDEX
  ========================================= */

  --z-base: 1;
  --z-modal: 400;
  --z-max: 999;

  /* =========================================
     LAYOUT
  ========================================= */

  --container-xs: 480px;
  --container-sm: 640px;
  --container-md: 768px;
  --container-lg: 1080px;
  --container-xl: 1240px;

}