/* ---- Premium utilitarian minimalism: warm monochrome + spot pastels ---- */
:root {
  --canvas: #fbfbfa;
  --surface: #ffffff;
  --surface-2: #f7f6f3;
  --ink: #23211d;
  --ink-soft: #4a4740;
  --muted: #8b877e;
  --line: #e9e7e1;
  --line-strong: #ddd9d0;

  --accent: #7a5a3a;      /* warm sienna, used sparingly */
  --accent-soft: #f0e9df;

  --green-bg: #edf3ec; --green-fg: #346538;
  --yellow-bg: #fbf3db; --yellow-fg: #8a5a00;
  --red-bg: #fdebec; --red-fg: #9f2f2d;
  --blue-bg: #e7f0f6; --blue-fg: #2b5f82;

  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, serif;
  --sans: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", "Menlo", monospace;

  --radius: 10px;
  --maxw: 1080px;
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
}

@media (prefers-color-scheme: dark) {
  :root {
    --canvas: #171614;
    --surface: #1e1d1a;
    --surface-2: #232220;
    --ink: #ece9e2;
    --ink-soft: #c3bfb5;
    --muted: #928d82;
    --line: #302e2a;
    --line-strong: #3b3833;
    --accent: #c79a6c;
    --accent-soft: #2a2620;
    --green-bg: #1e2a1f; --green-fg: #9cc79f;
    --yellow-bg: #2c2716; --yellow-fg: #d9b463;
    --red-bg: #2e1c1c; --red-fg: #e39b98;
    --blue-bg: #17262f; --blue-fg: #8fc0dc;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--canvas);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
.wrap { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

.ambient {
  position: fixed; inset: 0; z-index: 0; pointer-events: none;
  background:
    radial-gradient(60% 50% at 15% 0%, rgba(122, 90, 58, 0.05), transparent 70%),
    radial-gradient(50% 45% at 100% 10%, rgba(43, 95, 130, 0.04), transparent 70%);
}
body > *:not(.ambient) { position: relative; z-index: 1; }

/* ---- Masthead ---- */
.masthead { padding: 68px 0 30px; }
.eyebrow {
  font-family: var(--mono);
  font-size: 12px; letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--muted); margin: 0 0 18px;
}
.masthead h1 {
  font-family: var(--serif); font-weight: 600;
  font-size: clamp(38px, 6vw, 62px); line-height: 1.02; letter-spacing: -0.02em;
  margin: 0 0 18px;
}
.dek { max-width: 60ch; color: var(--ink-soft); font-size: 17px; margin: 0; }

/* ---- Toolbar ---- */
.toolbar {
  position: sticky; top: 0; z-index: 20;
  background: color-mix(in srgb, var(--canvas) 82%, transparent);
  backdrop-filter: saturate(1.4) blur(10px);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  margin-top: 22px;
}
.toolbar-inner {
  display: flex; align-items: center; gap: 16px; flex-wrap: wrap;
  padding-top: 12px; padding-bottom: 12px;
}
.seg { display: inline-flex; border: 1px solid var(--line-strong); border-radius: 8px; overflow: hidden; }
.seg-btn {
  appearance: none; border: 0; background: transparent; cursor: pointer;
  font: inherit; font-size: 13.5px; color: var(--ink-soft);
  padding: 7px 14px; transition: background 0.18s var(--ease), color 0.18s var(--ease);
}
.seg-btn + .seg-btn { border-left: 1px solid var(--line-strong); }
.seg-btn.is-active { background: var(--ink); color: var(--canvas); }

.search {
  display: inline-flex; align-items: center; gap: 8px; flex: 1 1 240px; min-width: 200px;
  background: var(--surface); border: 1px solid var(--line-strong); border-radius: 8px;
  padding: 0 12px; color: var(--muted);
}
.search input {
  appearance: none; border: 0; background: transparent; outline: none;
  font: inherit; font-size: 14px; color: var(--ink); width: 100%; padding: 8px 0;
}
.tool-actions { display: inline-flex; align-items: center; gap: 16px; flex-wrap: wrap; }
.link-btn {
  appearance: none; border: 0; background: transparent; cursor: pointer;
  font: inherit; font-size: 13.5px; color: var(--accent); padding: 4px 2px;
  border-bottom: 1px solid transparent; transition: border-color 0.18s var(--ease);
}
.link-btn:hover { border-bottom-color: var(--accent); }
.switch { display: inline-flex; align-items: center; gap: 8px; font-size: 13.5px; color: var(--ink-soft); cursor: pointer; user-select: none; }
.switch input { appearance: none; width: 34px; height: 20px; border-radius: 999px; background: var(--line-strong); position: relative; cursor: pointer; transition: background 0.2s var(--ease); flex: none; }
.switch input::after { content: ""; position: absolute; top: 2px; left: 2px; width: 16px; height: 16px; border-radius: 50%; background: var(--surface); transition: transform 0.2s var(--ease); }
.switch input:checked { background: var(--accent); }
.switch input:checked::after { transform: translateX(14px); }

/* ---- Legend ---- */
.legend-wrap { padding-top: 20px; }
.legend { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; font-size: 13px; }
.legend .muted { color: var(--muted); font-family: var(--mono); font-size: 11.5px; letter-spacing: 0.12em; text-transform: uppercase; }
.legend-count { color: var(--muted); margin-left: auto; font-size: 12.5px; }

.chip {
  display: inline-flex; align-items: center; border-radius: 999px;
  font-size: 11px; letter-spacing: 0.05em; text-transform: uppercase;
  padding: 3px 9px; font-weight: 500; white-space: nowrap;
}
.conf-high { background: var(--green-bg); color: var(--green-fg); }
.conf-medium { background: var(--yellow-bg); color: var(--yellow-fg); }
.conf-low { background: var(--red-bg); color: var(--red-fg); }
.disputed { background: var(--red-bg); color: var(--red-fg); }

/* ---- Tree ---- */
main#app { padding-top: 22px; padding-bottom: 80px; min-height: 40vh; }
.loading { color: var(--muted); font-family: var(--mono); font-size: 13px; padding: 40px 0; }
.error-box { border: 1px solid var(--red-bg); background: var(--red-bg); color: var(--red-fg); padding: 18px 20px; border-radius: var(--radius); font-size: 14px; }

.tree { display: flex; flex-direction: column; gap: 14px; }

.node { }
.node--saga > .row { padding: 20px 22px; }
.node--saga { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }

.row {
  display: grid; grid-template-columns: 22px 1fr auto; align-items: baseline; gap: 12px;
  width: 100%; text-align: left; cursor: pointer; user-select: none;
  background: transparent; border: 0; font: inherit; color: inherit;
  padding: 14px 22px;
  transition: background 0.15s var(--ease);
}
.row:hover { background: color-mix(in srgb, var(--surface-2) 60%, transparent); }
.row:focus-visible { outline: 2px solid var(--accent); outline-offset: -2px; border-radius: 6px; }

.twist {
  grid-column: 1; align-self: center;
  width: 16px; height: 16px; color: var(--muted);
  transition: transform 0.22s var(--ease); flex: none;
}
.node.open > .row > .twist { transform: rotate(90deg); }
.leaf > .row > .twist { visibility: hidden; }

.row-main { grid-column: 2; min-width: 0; }
.row-meta { grid-column: 3; display: inline-flex; align-items: center; gap: 8px; align-self: center; }

.saga-title { font-family: var(--serif); font-size: 22px; letter-spacing: -0.01em; margin: 0; line-height: 1.15; }
.saga-sub { color: var(--ink-soft); font-size: 14px; margin: 4px 0 0; }

.arc-title { font-family: var(--serif); font-size: 18px; margin: 0; line-height: 1.2; }
.arc-blurb { color: var(--muted); font-size: 13px; margin: 3px 0 0; }

.beat-title { font-size: 15.5px; font-weight: 600; margin: 0; letter-spacing: -0.005em; }
.beat-summary { color: var(--ink-soft); font-size: 14px; margin: 3px 0 0; }

.count-pill {
  font-family: var(--mono); font-size: 11px; color: var(--muted);
  border: 1px solid var(--line); border-radius: 6px; padding: 2px 7px; white-space: nowrap;
}

/* nested indentation via border rails */
.children { display: grid; grid-template-rows: 0fr; transition: grid-template-rows 0.28s var(--ease); }
.node.open > .children { grid-template-rows: 1fr; }
.children > .children-inner { overflow: hidden; min-height: 0; }

.node--saga > .children > .children-inner { padding: 0 12px 10px; }
.node--arc { border-top: 1px solid var(--line); }
.node--saga > .children .node--arc:first-child { border-top: 0; }
.node--arc > .children > .children-inner { padding-left: 20px; margin-left: 12px; border-left: 1px solid var(--line); }

.node--beat > .row { padding: 12px 16px; border-radius: 8px; }
.node--beat { border-radius: 8px; }

/* ---- Beat detail ---- */
.detail { padding: 4px 16px 18px; }
.detail-prose { font-family: var(--serif); font-size: 15.5px; line-height: 1.7; color: var(--ink); max-width: 68ch; }
.detail-prose p { margin: 0 0 12px; }
.detail-grid { display: flex; flex-wrap: wrap; gap: 20px 40px; margin-top: 14px; padding-top: 14px; border-top: 1px solid var(--line); }
.field { min-width: 140px; }
.field-label { font-family: var(--mono); font-size: 10.5px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--muted); margin: 0 0 7px; }
.tags { display: flex; flex-wrap: wrap; gap: 6px; }
.tag {
  font-size: 12px; padding: 3px 9px; border-radius: 999px;
  background: var(--surface-2); border: 1px solid var(--line); color: var(--ink-soft);
  cursor: default;
}
.tag.is-loc { background: var(--blue-bg); color: var(--blue-fg); border-color: transparent; }
.sources { list-style: none; margin: 0; padding: 0; }
.sources li { font-size: 12.5px; color: var(--muted); padding-left: 14px; position: relative; margin-bottom: 4px; }
.sources li::before { content: "\2014"; position: absolute; left: 0; color: var(--line-strong); }
.deps { font-family: var(--mono); font-size: 11.5px; color: var(--muted); }

.dispute-box { margin-top: 14px; border: 1px solid var(--red-bg); background: color-mix(in srgb, var(--red-bg) 45%, transparent); border-radius: 8px; padding: 12px 14px; }
.dispute-box h4 { margin: 0 0 8px; font-size: 12px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--red-fg); font-family: var(--mono); }
.dispute-claim { font-size: 13.5px; color: var(--ink-soft); padding: 6px 0; border-top: 1px dashed var(--line-strong); }
.dispute-claim:first-of-type { border-top: 0; }
.dispute-claim b { color: var(--ink); }

/* ---- Spoiler gate ---- */
.node.is-spoiled > .children,
.beat-spoiled .detail { display: none; }
.spoiler-lock {
  grid-column: 2 / 4; display: flex; align-items: center; gap: 10px;
  color: var(--muted); font-size: 13.5px;
}
.spoiler-lock svg { width: 14px; height: 14px; flex: none; }
.beat-spoiled .beat-title, .beat-spoiled .beat-summary { filter: blur(5px); user-select: none; }
.saga-spoiler-note { color: var(--muted); font-size: 12.5px; font-style: italic; }

/* ---- Spine view rows ---- */
.spine { display: flex; flex-direction: column; gap: 8px; }
.spine .node--beat { background: var(--surface); border: 1px solid var(--line); }
.spine .order-badge { font-family: var(--mono); font-size: 11px; color: var(--muted); }
.spine .arc-badge { font-family: var(--mono); font-size: 10.5px; color: var(--accent); text-transform: uppercase; letter-spacing: 0.08em; }
.spine-arc-rule { display: flex; align-items: center; gap: 12px; margin: 20px 0 4px; color: var(--muted); }
.spine-arc-rule::after { content: ""; flex: 1; height: 1px; background: var(--line); }
.spine-arc-rule span { font-family: var(--serif); font-size: 15px; color: var(--ink-soft); font-style: italic; }

.hidden { display: none !important; }
.hl { background: var(--yellow-bg); color: var(--yellow-fg); border-radius: 3px; padding: 0 1px; }

/* entry animation */
@media (prefers-reduced-motion: no-preference) {
  .node--saga, .spine .node--beat { animation: rise 0.5s var(--ease) both; animation-delay: calc(var(--i, 0) * 55ms); }
  @keyframes rise { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }
}

@media (max-width: 640px) {
  .row { grid-template-columns: 18px 1fr; }
  .row-meta { grid-column: 2; grid-row: 2; margin-top: 6px; }
  .detail-grid { gap: 16px; }
}