/* Shared tokens and base styles for At The Frontier */
:root {
  --paper: #fafafb;
  --paper-2: #f3f4f6;
  --card: #ffffff;
  --rule: #eceef2;
  --line: #e2e4e9;
  --line-2: #cfd2d9;
  --ink: #0c0d12;
  --ink-2: #2f323a;
  --ink-3: #5b5f6a;
  --muted: #8b8f99;
  --blue: #1a2fd0;
  --blue-2: #3d50e6;
  --blue-soft: #e9ecff;
  --orange: #e5892a;
  --red: #d6453b;
  --green: #2c9a58;
  --purple: #7b4fd6;
  --teal: #12909a;
  --yellow: #d9a90f;
  --pink: #d64f97;

  --f-head: "Geist", ui-sans-serif, system-ui, sans-serif;
  --f-body: "Manrope", ui-sans-serif, system-ui, sans-serif;
  --f-mono: "Geist Mono", ui-monospace, "SF Mono", Menlo, monospace;

  --ease: cubic-bezier(.2, .7, .1, 1);
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--f-body);
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }

h1, h2, h3, h4 { font-family: var(--f-head); font-weight: 500; margin: 0; letter-spacing: -0.035em; line-height: 1.05; color: var(--ink); }

.mono, .label { font-family: var(--f-mono); }
.label {
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}
.label b { color: var(--ink-2); font-weight: 500; }

/* ruled paper background */
.ruled {
  background-color: var(--paper);
  background-image:
    linear-gradient(to bottom, var(--rule) 1px, transparent 1px);
  background-size: 100% 28px;
}
.gridded {
  background-color: var(--paper);
  background-image:
    linear-gradient(to right, var(--rule) 1px, transparent 1px),
    linear-gradient(to bottom, var(--rule) 1px, transparent 1px);
  background-size: 56px 56px;
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 2px;
}

.tag {
  display: inline-flex; align-items: center; gap: 6px;
  font-family: var(--f-mono); font-size: 11px; letter-spacing: .06em; text-transform: uppercase;
  padding: 3px 7px; border: 1px solid var(--line-2); color: var(--ink-3); background: var(--card);
}
.tag i { width: 8px; height: 8px; display: inline-block; background: currentColor; }
.tag.blue { color: var(--blue); border-color: color-mix(in srgb, var(--blue) 40%, white); background: var(--blue-soft); }

.btn {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--f-body); font-size: 14px; font-weight: 500;
  padding: 10px 16px; border: 1px solid var(--ink); background: var(--ink); color: #fff;
}
.btn:hover { text-decoration: none; background: var(--blue); border-color: var(--blue); }
.btn.ghost { background: transparent; color: var(--ink); border-color: var(--line-2); }
.btn.ghost:hover { border-color: var(--ink); background: var(--card); }

/* reveal on scroll / on slide entry */
.rise { opacity: 0; transform: translateY(14px); transition: opacity .7s var(--ease), transform .7s var(--ease); transition-delay: calc(var(--i, 0) * 70ms); }
.in .rise, .rise.in { opacity: 1; transform: none; }

/* bounding-box motif */
.bbox {
  position: absolute; border: 1.5px solid var(--c, var(--blue));
  background: color-mix(in srgb, var(--c, var(--blue)) 10%, transparent);
}
.bbox > .bbox-tag {
  position: absolute; left: -1.5px; top: -17px; height: 16px; padding: 0 5px;
  font-family: var(--f-mono); font-size: 9.5px; line-height: 16px; color: #fff; background: var(--c, var(--blue));
  white-space: nowrap; letter-spacing: .04em;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
}