:root {
  /* Brand Primary: Ocean Depth & Precision (Nemo12) */
  --color-primary-50: #F0FDFA;
  --color-primary-100: #CCFBF1;
  --color-primary-200: #99F6E4;
  --color-primary-300: #5EEAD4;
  --color-primary-400: #2DD4BF;
  --color-primary-500: #14B8A6;
  --color-primary-600: #0D9488;
  --color-primary-700: #0F766E; /* Core Brand Primary */
  --color-primary-800: #115E59;
  --color-primary-900: #134E4A;
  --color-primary-950: #042F2E;

  /* Marlins Care Accent: Warmth, Guidance & Human Touch */
  --color-accent-50: #FFF7ED;
  --color-accent-100: #FFEDD5;
  --color-accent-200: #FED7AA;
  --color-accent-300: #FDBA74;
  --color-accent-400: #FB923C;
  --color-accent-500: #F97316;
  --color-accent-600: #EA580C; /* Core Accent Coral */
  --color-accent-700: #C2410C;

  /* Functional Roles & Touchpoint Tags */
  --color-system: #0284C7;     /* Blue: Automated System Evidence */
  --color-mentor: #0D9488;     /* Teal: Mentor Context & Judgment */
  --color-marlins: #EA580C;    /* Coral: Marlins Care / Parent Reflection */
  --color-hybrid: #7C3AED;     /* Violet: System + Mentor Collaborative */
  --color-risk: #DC2626;       /* Red: Learning Risk / Concern (T7) */
  --color-milestone: #059669;  /* Emerald: Positive Milestone (T13) */

  /* Neutral Backgrounds & Text (Light Mode default) */
  --bg-app: #F8FAFC;
  --bg-surface: #FFFFFF;
  --bg-surface-elevated: #FFFFFF;
  --bg-surface-subtle: #F1F5F9;
  --bg-surface-glass: rgba(255, 255, 255, 0.85);
  
  --text-primary: #0F172A;
  --text-secondary: #475569;
  --text-muted: #64748B;
  --border-subtle: #E2E8F0;
  --border-strong: #CBD5E1;

  /* Elevation Shadows */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.07), 0 2px 4px -2px rgb(0 0 0 / 0.05);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.08), 0 4px 6px -4px rgb(0 0 0 / 0.04);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  --shadow-glow-teal: 0 0 20px -5px rgba(13, 148, 136, 0.25);
  --shadow-glow-coral: 0 0 20px -5px rgba(234, 88, 12, 0.25);

  /* Radius & Transitions */
  --radius-xs: 4px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);

  /* Spacing Scale */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;
  --space-16: 64px;

  /* Typography */
  --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

/* Dark Mode Tokens (Chuẩn VitePress / docs.nemo12.com) */
[data-theme="dark"], .dark {
  --bg-app: #090D16;
  --bg-surface: #111827;
  --bg-surface-elevated: #1F2937;
  --bg-surface-subtle: #162032;
  --bg-surface-glass: rgba(17, 24, 39, 0.85);
  
  --text-primary: #F8FAFC;
  --text-secondary: #CBD5E1;
  --text-muted: #94A3B8;
  --border-subtle: #1E293B;
  --border-strong: #334155;

  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.3);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.4);
  --shadow-lg: 0 10px 20px -3px rgb(0 0 0 / 0.5);
  --shadow-glow-teal: 0 0 25px -5px rgba(20, 184, 166, 0.35);
  --shadow-glow-coral: 0 0 25px -5px rgba(249, 115, 22, 0.35);
}

/* Base Reset & Globals */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.5;
  color: var(--text-primary);
  background-color: var(--bg-app);
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  min-height: 100vh;
  background-color: var(--bg-app);
  color: var(--text-primary);
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

input, textarea {
  font-family: inherit;
}

code, kbd, pre {
  font-family: var(--font-mono);
}

/* Custom Scrollbars */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--border-strong);
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}