/* Graph Atlas — an index, not a dashboard.
   Light-first "archival paper" instrument: warm neutrals, hairline rules, one ochre accent.
   Dark pairing is designed, not inverted. */

:root {
  color-scheme: light dark;

  --paper:      oklch(0.985 0.008 85);
  --paper-sunk: oklch(0.955 0.010 82);
  --rule:       oklch(0.885 0.012 80);
  --rule-soft:  oklch(0.925 0.010 80);
  --ink:        oklch(0.245 0.014 60);
  --ink-2:      oklch(0.470 0.014 60);
  --ink-3:      oklch(0.620 0.012 60);
  --accent:     oklch(0.545 0.140 52);
  --accent-sunk:oklch(0.945 0.030 62);
  --danger:     oklch(0.505 0.160 25);

  --sans: "Outfit", ui-sans-serif, -apple-system, "Segoe UI", sans-serif;
  --mono: "JetBrains Mono", ui-monospace, "SF Mono", Consolas, monospace;

  --ease: cubic-bezier(0.16, 1, 0.3, 1);
  --rail: 21rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper:      oklch(0.185 0.010 65);
    --paper-sunk: oklch(0.225 0.012 65);
    --rule:       oklch(0.325 0.012 65);
    --rule-soft:  oklch(0.268 0.010 65);
    --ink:        oklch(0.945 0.008 80);
    --ink-2:      oklch(0.760 0.010 75);
    --ink-3:      oklch(0.610 0.010 70);
    --accent:     oklch(0.735 0.135 62);
    --accent-sunk:oklch(0.290 0.045 55);
    --danger:     oklch(0.680 0.150 28);
  }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

svg { width: 1.125rem; height: 1.125rem; fill: none; stroke: currentColor; stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; }

/* ---------------------------------------------------------------- boot */

.boot { position: fixed; inset: 0; display: grid; place-content: center; justify-items: center; gap: 1rem; background: var(--paper); z-index: 100; }
.boot p { margin: 0; color: var(--ink-3); font-size: 0.875rem; letter-spacing: 0.04em; text-transform: uppercase; }
.boot-mark { width: 2rem; height: 2rem; border: 1.5px solid var(--rule); border-top-color: var(--accent); border-radius: 50%; animation: spin 0.9s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ---------------------------------------------------------------- gate */

.gate { min-height: 100dvh; display: grid; align-items: center; padding: 2rem 1.25rem; }
.gate-inner { width: 100%; max-width: 26rem; margin-inline: auto; }
.gate-title { font-size: clamp(2rem, 7vw, 2.75rem); font-weight: 300; letter-spacing: -0.03em; margin: 0 0 0.5rem; }
.accent { color: var(--accent); font-weight: 500; }
.gate-sub { margin: 0 0 2.25rem; color: var(--ink-2); max-width: 34ch; }
.gate-form { display: grid; gap: 1rem; }
.gate-foot { margin-top: 2rem; padding-top: 1.25rem; border-top: 1px solid var(--rule-soft); color: var(--ink-3); font-size: 0.8125rem; line-height: 1.6; max-width: 40ch; }
.gate-foot code { font-family: var(--mono); font-size: 0.75rem; color: var(--ink-2); }

.field { display: grid; gap: 0.5rem; }
.field-label { font-size: 0.75rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink-3); }
.field input {
  width: 100%; min-height: 3rem; padding: 0 0.875rem;
  font: 400 1rem/1 var(--mono); color: var(--ink);
  background: var(--paper-sunk); border: 1px solid var(--rule); border-radius: 0.5rem;
  transition: border-color 0.18s var(--ease), background 0.18s var(--ease);
}
.field input:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; border-color: var(--accent); }
.field-error { margin: 0; color: var(--danger); font-size: 0.875rem; }

.btn-primary {
  min-height: 3rem; padding: 0 1.25rem; border: 0; border-radius: 0.5rem;
  background: var(--accent); color: oklch(0.99 0.01 85);
  font: 500 0.9375rem/1 var(--sans); letter-spacing: 0.01em; cursor: pointer;
  transition: transform 0.16s var(--ease), filter 0.16s var(--ease);
}
.btn-primary:hover { filter: brightness(1.06); }
.btn-primary:active { transform: translateY(1px); }
.btn-primary[disabled] { opacity: 0.5; cursor: progress; }

/* ---------------------------------------------------------------- shell */

.app { min-height: 100dvh; display: flex; flex-direction: column; }

.topbar {
  display: flex; align-items: center; gap: 0.875rem;
  padding: 0.75rem max(1rem, env(safe-area-inset-left)) 0.75rem max(1rem, env(safe-area-inset-right));
  border-bottom: 1px solid var(--rule); background: var(--paper);
  position: sticky; top: 0; z-index: 20;
}
.wordmark { font-size: 1.0625rem; font-weight: 400; letter-spacing: -0.02em; margin: 0; white-space: nowrap; }
.switch { display: flex; gap: 0.25rem; margin-left: auto; background: var(--paper-sunk); border-radius: 0.5rem; padding: 0.1875rem; }
.switch button {
  min-height: 2.25rem; padding: 0 0.75rem; border: 0; border-radius: 0.375rem; cursor: pointer;
  background: transparent; color: var(--ink-2); font: 400 0.8125rem/1 var(--sans); white-space: nowrap;
  transition: background 0.18s var(--ease), color 0.18s var(--ease);
}
.switch button[aria-selected="true"] { background: var(--paper); color: var(--ink); box-shadow: 0 1px 2px oklch(0.5 0.02 60 / 0.12); }

.icon-btn {
  display: grid; place-content: center; width: 2.5rem; height: 2.5rem; flex: none;
  border: 0; border-radius: 0.5rem; background: transparent; color: var(--ink-2); cursor: pointer;
  transition: background 0.18s var(--ease), color 0.18s var(--ease);
}
.icon-btn:hover { background: var(--paper-sunk); color: var(--ink); }
.icon-btn.subtle { width: 2rem; height: 2rem; }
.text-btn { border: 0; background: none; color: var(--ink-3); font: 400 0.8125rem/1 var(--sans); cursor: pointer; padding: 0.5rem; }
.text-btn:hover { color: var(--accent); }

.freshness {
  padding: 0.625rem 1rem; border-bottom: 1px solid var(--rule-soft);
  background: var(--accent-sunk); color: var(--ink-2); font-size: 0.8125rem;
}
.freshness strong { color: var(--ink); font-weight: 500; }

/* ---------------------------------------------------------------- panes */

.panes { flex: 1; display: grid; grid-template-columns: var(--rail) 1fr; min-height: 0; }
.pane { min-height: 0; overflow-y: auto; overscroll-behavior: contain; }
.pane-index { border-right: 1px solid var(--rule); display: flex; flex-direction: column; }
.pane-detail { padding: 1.75rem clamp(1rem, 4vw, 3rem) 5rem; }

.search-wrap { position: relative; display: flex; align-items: center; padding: 0.875rem 1rem; border-bottom: 1px solid var(--rule-soft); gap: 0.5rem; }
.search-icon { position: absolute; left: 1.6rem; color: var(--ink-3); pointer-events: none; }
#q {
  flex: 1; min-height: 2.75rem; padding: 0 0.75rem 0 2.5rem;
  font: 400 0.9375rem/1 var(--sans); color: var(--ink);
  background: var(--paper-sunk); border: 1px solid transparent; border-radius: 0.5rem;
  appearance: none;
}
#q:focus-visible { outline: none; border-color: var(--accent); background: var(--paper); }
#q::-webkit-search-cancel-button { display: none; }

.status { padding: 0.75rem 1rem; color: var(--ink-3); font-size: 0.75rem; letter-spacing: 0.06em; text-transform: uppercase; }

.results { list-style: none; margin: 0; padding: 0 0 3rem; }
.results li { border-bottom: 1px solid var(--rule-soft); }
.results button {
  display: grid; gap: 0.1875rem; width: 100%; min-height: 3.25rem;
  padding: 0.75rem 1rem; border: 0; background: none; text-align: left; cursor: pointer;
  border-left: 2px solid transparent;
  transition: background 0.14s var(--ease);
}
.results button:hover { background: var(--paper-sunk); }
.results button[aria-current="true"] { background: var(--accent-sunk); }
.res-label { color: var(--ink); font-size: 0.9375rem; line-height: 1.35; word-break: break-word; }
.res-meta { color: var(--ink-3); font-family: var(--mono); font-size: 0.6875rem; word-break: break-all; }

@media (prefers-reduced-motion: no-preference) {
  .results li { animation: rise 0.34s var(--ease) both; animation-delay: calc(var(--i) * 18ms); }
  @keyframes rise { from { opacity: 0; transform: translateY(6px); } }
}

/* ---------------------------------------------------------------- detail */

.empty { max-width: 34rem; }
.empty h2 { font-size: 1.375rem; font-weight: 400; letter-spacing: -0.02em; margin: 0 0 0.5rem; }
.empty p { color: var(--ink-2); margin: 0 0 1.75rem; }

.node-head { margin-bottom: 1.75rem; }
.node-kind { font-size: 0.6875rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--accent); margin-bottom: 0.5rem; }
.node-title { font-size: clamp(1.375rem, 3.5vw, 1.875rem); font-weight: 400; letter-spacing: -0.025em; margin: 0 0 0.875rem; line-height: 1.2; word-break: break-word; }
.node-path { font-family: var(--mono); font-size: 0.8125rem; color: var(--ink-2); word-break: break-all; }

.facts { display: flex; flex-wrap: wrap; gap: 0 2rem; margin: 0 0 2rem; padding: 0.875rem 0; border-top: 1px solid var(--rule-soft); border-bottom: 1px solid var(--rule-soft); }
.fact { display: grid; gap: 0.125rem; padding: 0.25rem 0; }
.fact dt { font-size: 0.6875rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink-3); }
.fact dd { margin: 0; font-family: var(--mono); font-size: 0.9375rem; color: var(--ink); font-variant-numeric: tabular-nums; }

.section-head { display: flex; align-items: baseline; justify-content: space-between; gap: 1rem; margin: 2rem 0 0.5rem; }
.section-head h3 { font-size: 0.75rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink-3); font-weight: 500; margin: 0; }
.section-head span { font-family: var(--mono); font-size: 0.75rem; color: var(--ink-3); }

.rel-group { border-top: 1px solid var(--rule-soft); padding: 0.75rem 0; }
.rel-name { font-family: var(--mono); font-size: 0.75rem; color: var(--accent); margin-bottom: 0.375rem; }
.rel-list { display: flex; flex-wrap: wrap; gap: 0.375rem; }
.chip {
  display: inline-flex; align-items: center; gap: 0.375rem; min-height: 2.25rem;
  padding: 0.3125rem 0.6875rem; border: 1px solid var(--rule); border-radius: 1.25rem;
  background: none; color: var(--ink); font: 400 0.8125rem/1.3 var(--sans); cursor: pointer;
  text-align: left; max-width: 100%;
  transition: border-color 0.16s var(--ease), background 0.16s var(--ease), transform 0.16s var(--ease);
}
.chip:hover { border-color: var(--accent); background: var(--accent-sunk); }
.chip:active { transform: translateY(1px); }
.chip .dir { font-family: var(--mono); font-size: 0.6875rem; color: var(--ink-3); flex: none; }
.chip .txt { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; max-width: 15rem; }

.pathbar { display: flex; flex-wrap: wrap; gap: 0.5rem; align-items: center; margin-top: 0.75rem; }
.pathbar input { flex: 1 1 12rem; min-height: 2.75rem; padding: 0 0.75rem; font: 400 0.875rem/1 var(--sans); color: var(--ink); background: var(--paper-sunk); border: 1px solid var(--rule); border-radius: 0.5rem; }
.pathbar button { min-height: 2.75rem; padding: 0 1rem; border: 1px solid var(--rule); border-radius: 0.5rem; background: none; color: var(--ink); font: 400 0.875rem/1 var(--sans); cursor: pointer; }
.pathbar button:hover { border-color: var(--accent); color: var(--accent); }

.trail { list-style: none; margin: 1rem 0 0; padding: 0; }
.trail li { position: relative; padding: 0 0 1rem 1.5rem; border-left: 1px solid var(--rule); }
.trail li:last-child { border-left-color: transparent; padding-bottom: 0; }
.trail li::before { content: ""; position: absolute; left: -0.3125rem; top: 0.4375rem; width: 0.5625rem; height: 0.5625rem; border-radius: 50%; background: var(--accent); }
.trail .step-rel { font-family: var(--mono); font-size: 0.6875rem; color: var(--ink-3); }
.trail button { border: 0; background: none; padding: 0; color: var(--ink); font: 400 0.9375rem/1.35 var(--sans); cursor: pointer; text-align: left; word-break: break-word; }
.trail button:hover { color: var(--accent); }

.note { color: var(--ink-3); font-size: 0.8125rem; margin: 0.75rem 0 0; }
.api-hint { margin-top: 2.5rem; padding-top: 1.25rem; border-top: 1px solid var(--rule-soft); }
.api-hint pre { font-family: var(--mono); font-size: 0.75rem; color: var(--ink-2); background: var(--paper-sunk); padding: 0.875rem 1rem; border-radius: 0.5rem; overflow-x: auto; margin: 0.5rem 0 0; }

/* ---------------------------------------------------------------- responsive */

@media (max-width: 860px) {
  .panes { grid-template-columns: 1fr; }
  .pane-index { border-right: 0; }
  .pane-detail { display: none; padding: 1.25rem 1rem 4rem; }
  body[data-view="detail"] .pane-index { display: none; }
  body[data-view="detail"] .pane-detail { display: block; }
  .wordmark { font-size: 1rem; }
  .switch button { padding: 0 0.625rem; font-size: 0.75rem; }
  .chip .txt { max-width: 11rem; }
}

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