/* ============================================================
   openCCR Design System — main.css
   Design tokens, reset, typography, layout utilities
   ============================================================ */

/* --- Google Fonts --- */
@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;500;600;700&family=Inter:wght@400;500;600&family=JetBrains+Mono:wght@400;500&display=swap');

/* --- Design Tokens --- */
:root {
  /* Colors */
  --color-bg:         #FFFFFF;
  --color-bg-subtle:  #F0F5FA;
  --color-border:     #C8DCF0;
  --color-text:       #111827;
  --color-text-muted: #4B6478;
  --color-navy:       #0A3060;
  --color-ocean:      #0E6BAD;
  --color-cyan:       #24B4D8;
  --color-warning:    #C0392B;

  /* Typography */
  --font-heading: 'Space Grotesk', system-ui, sans-serif;
  --font-body:    'Inter', system-ui, sans-serif;
  --font-code:    'JetBrains Mono', 'Fira Code', monospace;

  /* Font sizes */
  --text-xs:   0.75rem;   /* 12px */
  --text-sm:   0.875rem;  /* 14px */
  --text-base: 1rem;      /* 16px */
  --text-lg:   1.125rem;  /* 18px */
  --text-xl:   1.25rem;   /* 20px */
  --text-2xl:  1.5rem;    /* 24px */
  --text-3xl:  1.875rem;  /* 30px */
  --text-4xl:  2.25rem;   /* 36px */
  --text-5xl:  3rem;      /* 48px */

  /* Spacing scale */
  --space-1:  4px;
  --space-2:  8px;
  --space-3:  12px;
  --space-4:  16px;
  --space-6:  24px;
  --space-8:  32px;
  --space-12: 48px;
  --space-16: 64px;

  /* Layout */
  --max-width: 1200px;
  --nav-height: 64px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(10, 48, 96, 0.08);
  --shadow-md: 0 4px 12px rgba(10, 48, 96, 0.12);
  --shadow-lg: 0 8px 24px rgba(10, 48, 96, 0.16);

  /* Transitions */
  --transition: 200ms ease;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

img, svg {
  display: block;
  max-width: 100%;
}

a {
  color: var(--color-ocean);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover {
  color: var(--color-cyan);
}

/* --- Typography --- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  color: var(--color-navy);
  line-height: 1.2;
  font-weight: 700;
}

h1 { font-size: var(--text-5xl); }
h2 { font-size: var(--text-4xl); }
h3 { font-size: var(--text-3xl); }
h4 { font-size: var(--text-2xl); }
h5 { font-size: var(--text-xl); }
h6 { font-size: var(--text-lg); }

p {
  margin-bottom: var(--space-4);
}

p:last-child {
  margin-bottom: 0;
}

ul, ol {
  padding-left: var(--space-6);
}

li {
  margin-bottom: var(--space-2);
}

code, pre {
  font-family: var(--font-code);
  font-size: var(--text-sm);
}

code {
  background: var(--color-bg-subtle);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 2px 6px;
  color: var(--color-navy);
}

pre {
  background: var(--color-navy);
  color: #e2e8f0;
  border-radius: var(--radius-md);
  padding: var(--space-6);
  overflow-x: auto;
  line-height: 1.7;
}

pre code {
  background: none;
  border: none;
  padding: 0;
  color: inherit;
  font-size: var(--text-sm);
}

/* --- Layout --- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--space-6);
}

.section {
  padding-block: var(--space-16);
}

.section--subtle {
  background: var(--color-bg-subtle);
}

.page-content {
  padding-top: var(--nav-height);
  flex: 1;
}

/* --- Grid --- */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-6);
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-6);
}

/* --- Utilities --- */
.text-muted    { color: var(--color-text-muted); }
.text-navy     { color: var(--color-navy); }
.text-ocean    { color: var(--color-ocean); }
.text-center   { text-align: center; }
.font-heading  { font-family: var(--font-heading); }
.font-mono     { font-family: var(--font-code); }

.flex           { display: flex; }
.flex-col       { flex-direction: column; }
.items-center   { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-2          { gap: var(--space-2); }
.gap-4          { gap: var(--space-4); }
.gap-6          { gap: var(--space-6); }
.gap-8          { gap: var(--space-8); }
.mt-auto        { margin-top: auto; }

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  border: 0;
}

/* --- Scroll anchor offset for fixed nav --- */
[id] {
  scroll-margin-top: calc(var(--nav-height) + var(--space-4));
}

/* --- Responsive --- */
@media (max-width: 768px) {
  h1 { font-size: var(--text-4xl); }
  h2 { font-size: var(--text-3xl); }
  h3 { font-size: var(--text-2xl); }

  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }

  .section {
    padding-block: var(--space-12);
  }

  .container {
    padding-inline: var(--space-4);
  }
}