/* CipherKit — base.css
   CSS custom properties + reset + typography
   All other files import these variables. */

:root {
  /* Colors */
  --bg:       #07090d;
  --surface:  #0d1117;
  --sf2:      #161b22;
  --border:   #1e2530;
  --green:    #3dd68c;
  --gdim:     #163a27;
  --amber:    #e8a020;
  --red:      #e5534b;
  --blue:     #58a6ff;
  --purple:   #b083f0;
  --text:     #dde4ed;
  --muted:    #9ea7b2;
  --dim:      #9ea7b2;

  /* Typography */
  --mono: 'Space Mono', 'Courier New', monospace;
  --sans: 'Syne', Arial, sans-serif;

  /* Layout */
  --r:        8px;
  --r-sm:     4px;
  --r-lg:     12px;
  --max-w:    1100px;
  --max-w-sm: 720px;
}

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

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

body {
  background:   var(--bg);
  color:        var(--text);
  font-family:  var(--mono);
  min-height:   100vh;
  overflow-x:   hidden;
  line-height:  1.6;
}

/* Subtle grid background */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(61,214,140,.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(61,214,140,.02) 1px, transparent 1px);
  background-size: 44px 44px;
  pointer-events: none;
  z-index: 0;
}

* { position: relative; z-index: 1; }

/* ── LINKS ───────────────────────────────────────────────────────────────── */
a {
  color: var(--green);
  text-decoration: none;
  transition: opacity .15s;
}
a:hover { opacity: .8; }
a:focus-visible {
  outline: 2px solid var(--green);
  outline-offset: 3px;
  border-radius: 3px;
}

/* ── TYPOGRAPHY ──────────────────────────────────────────────────────────── */
h1, h2, h3, h4 {
  font-family: var(--sans);
  font-weight: 800;
  line-height: 1.2;
  color: var(--text);
}

h1 { font-size: clamp(28px, 4vw, 44px); letter-spacing: -1px; }
h2 { font-size: clamp(18px, 2.5vw, 26px); letter-spacing: -.4px; margin-bottom: 16px; }
h3 { font-size: 15px; font-weight: 700; }

p { color: var(--muted); line-height: 1.75; }

code, pre {
  font-family: var(--mono);
  font-size: .9em;
  background: var(--sf2);
  border-radius: var(--r-sm);
}
code { padding: 2px 6px; }
pre  { padding: 16px; overflow-x: auto; border: 1px solid var(--border); }

/* ── ACCESSIBILITY ───────────────────────────────────────────────────────── */
.skip-link {
  position: absolute;
  top: -100px;
  left: 16px;
  background: var(--green);
  color: #02150a;
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 700;
  padding: 8px 16px;
  border-radius: 6px;
  text-decoration: none;
  z-index: 9999;
  transition: top .2s;
}
.skip-link:focus { top: 8px; }

/* ── TOAST ───────────────────────────────────────────────────────────────── */
.toast {
  position: fixed;
  bottom: 28px;
  left: 50%;
  transform: translateX(-50%) translateY(16px);
  background: var(--sf2);
  border: 1px solid var(--gdim);
  color: var(--green);
  font-size: 12px;
  padding: 9px 18px;
  border-radius: 8px;
  opacity: 0;
  transition: all .28s;
  pointer-events: none;
  z-index: 9999;
  display: flex;
  align-items: center;
  gap: 7px;
  white-space: nowrap;
}
.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ── SCROLLBAR ───────────────────────────────────────────────────────────── */
::-webkit-scrollbar       { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--surface); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--muted); }

/* ── ANIMATIONS ──────────────────────────────────────────────────────────── */
@keyframes spin  { to { transform: rotate(360deg); } }
@keyframes blink {
  0%, 100% { opacity: 1; }
  50%       { opacity: .2; }
}
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

.spin-icon { animation: spin .7s linear infinite; }
.fade-up   { animation: fadeUp .3s ease; }