/* ============================================================
   BRANDING.CSS — Design tokens, base typography, utilities
   Shared across all pages: index, cv, blog, freelancing
   ============================================================ */

/* -------- Design Tokens -------- */
:root {
  --deep-slate:   #1C2A38;
  --slate-mid:    #2E4356;
  --muted-steel:  #8CA3AF;
  --alpine-teal:  #3AAFA9;
  --teal-deep:    #2D8A85;
  --warm-white:   #F0EDE8;
  --bg-2:         #E8E4DD;
  --trail-ember:  #D9552B;

  /* Semantic — light mode */
  --bg:       var(--warm-white);
  --surface:  #FFFFFF;
  --ink:      var(--deep-slate);
  --ink-2:    var(--slate-mid);
  --ink-3:    var(--muted-steel);
  --rule:     #D8D2C7;
  --accent:   var(--alpine-teal);
  --accent-2: var(--teal-deep);
  --accent-bg: color-mix(in oklab, var(--alpine-teal) 14%, transparent);

  --font-display: 'DM Sans', system-ui, sans-serif;
  --font-body:    'DM Sans', system-ui, sans-serif;
  --font-mono:    'JetBrains Mono', ui-monospace, monospace;
  --font-hand:    'Caveat', cursive;

  --density: 0.88; /* compact */
  --max:     1240px;
  --pad-x:   clamp(20px, 4vw, 56px);

  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 32px;
  --space-xl: 64px;

  --radius:     4px;
  --nav-height: calc(60px * var(--density));
}

/* -------- Dark mode -------- */
[data-theme="dark"] {
  --bg:      #0F1923;
  --bg-2:    #15222E;
  --surface: var(--slate-mid);
  --ink:     var(--warm-white);
  --ink-2:   #CFD8DD;
  --ink-3:   var(--muted-steel);
  --rule:    #2A3C4C;
}

[data-theme="dark"] body {
  background: linear-gradient(170deg,
    var(--bg) 0%,
    color-mix(in oklab, var(--bg-2) 40%, var(--bg) 100%) 100%);
}

/* -------- Subtle grain overlay -------- */
body::after {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 9999;
  opacity: 0.018;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-size: 200px 200px;
}

[data-theme="dark"] body::after {
  opacity: 0.03;
}

/* -------- Base reset -------- */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }

body {
  background: linear-gradient(170deg,
    var(--bg) 0%,
    color-mix(in oklab, var(--bg-2) 35%, var(--bg) 100%) 100%);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: calc(16px * var(--density));
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-2); }

img { max-width: 100%; height: auto; display: block; }

ul, ol { padding-left: 1.4em; }

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  line-height: 1.2;
  letter-spacing: -0.01em;
  margin-top: 0;
}

/* -------- Layout -------- */
.wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--pad-x);
}

/* -------- Utility classes -------- */
.mono {
  font-family: var(--font-mono);
  font-size: 0.78em;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ink-3);
}

.hand {
  font-family: var(--font-hand);
  font-weight: 500;
  color: var(--trail-ember);
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.tag {
  font-family: var(--font-mono);
  font-size: 12px;
  padding: 4px 10px;
  background: var(--accent-bg);
  color: var(--accent-2);
  border-radius: var(--radius);
  letter-spacing: 0.02em;
  transition: background-color 0.15s, color 0.15s;
}

.tag:hover {
  background: color-mix(in oklab, var(--accent) 22%, transparent);
  color: var(--accent);
}

[data-theme="dark"] .tag { color: var(--accent); }

.tag.second {
  background: color-mix(in oklab, var(--trail-ember) 14%, transparent);
  color: #A84520;
}

[data-theme="dark"] .tag.second { color: var(--trail-ember); }

/* -------- Skip link -------- */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--accent);
  color: #fff;
  padding: 8px 16px;
  z-index: 1000;
  font-size: 14px;
  border-radius: 0 0 4px 0;
  transition: top 0.2s;
}
.skip-link:focus { top: 0; }

/* -------- Screen reader only -------- */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}