/* Horizon daily — ink-ui tokens (from cheney-yan/ink-ui src/globals.css).
   Tier 1 atoms (OKLCH numbers) → tier 2 ladders → tier 3 semantics.
   Components below use ONLY semantic names. */

:root {
  --a-l: 0.72; --a-c: 0.16; --a-h: 145;
  --b0-l: 0.12; --b1-l: 0.17; --b2-l: 0.22; --b3-l: 0.27; --b4-l: 0.38; --b-c: 0.008; --b-h: 60;
  --c0-l: 0.96; --c1-l: 0.86; --c2-l: 0.76; --c3-l: 0.62; --c4-l: 0.52; --c-c: 0.015; --c-h: 75;
  --accent-contrast-l: 0.16;
  --elev: 0 0 0 1px oklch(1 0 0 / 0.06), 0 8px 24px -12px oklch(0 0 0 / 0.5);
}
html[data-theme='light'] {
  --mid-ink-l: 0.42;
  --b0-l: 0.985; --b1-l: 0.965; --b2-l: 0.94; --b3-l: 0.91; --b4-l: 0.85; --b-c: 0.004;
  --c0-l: 0.18; --c1-l: 0.32; --c2-l: 0.45; --c3-l: 0.58; --c4-l: 0.68;
  --accent-contrast-l: 0.98; --a-l: 0.56; --a-c: 0.17;
  --edge-card: oklch(0.88 0.006 60);
  --elev: 0 1px 2px oklch(0 0 0 / 0.06), 0 8px 24px -14px oklch(0 0 0 / 0.25);
}
:root {
  --surface-0: oklch(var(--b0-l) var(--b-c) var(--b-h));
  --surface-1: oklch(var(--b1-l) var(--b-c) var(--b-h));
  --surface-2: oklch(var(--b2-l) var(--b-c) var(--b-h));
  --surface-3: oklch(var(--b3-l) var(--b-c) var(--b-h));
  --surface-4: oklch(var(--b4-l) var(--b-c) var(--b-h));
  --ink:        oklch(var(--c0-l) var(--c-c) var(--c-h));
  --ink-muted:  oklch(var(--c1-l) var(--c-c) var(--c-h));
  --ink-subtle: oklch(var(--c2-l) var(--c-c) var(--c-h));
  --ink-faint:  oklch(var(--c3-l) var(--c-c) var(--c-h));
  --page: var(--surface-0);
  --panel: var(--surface-1);
  --raised: var(--surface-2);
  --edge: var(--surface-3);
  --edge-strong: var(--surface-4);
  --accent: oklch(var(--a-l) var(--a-c) var(--a-h));
  --accent-bg: oklch(var(--a-l) var(--a-c) var(--a-h) / 0.14);
  --accent-contrast: oklch(var(--accent-contrast-l) calc(var(--a-c) * 0.3) var(--a-h));
  --warning: oklch(0.80 0.15 80);
  --warning-bg: oklch(0.80 0.15 80 / 0.14);
  --font-sans: -apple-system, BlinkMacSystemFont, 'Inter Variable', 'PingFang SC', 'Hiragino Sans GB', ui-sans-serif, system-ui, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, monospace;
}

/* ---- base: stability law — the page never pans sideways ---- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; overflow-x: clip; background: var(--page); color-scheme: dark; }
html[data-theme='light'] { color-scheme: light; }
body {
  margin: 0; background: var(--page); color: var(--ink);
  font: 400 0.9375rem/1.6 var(--font-sans);   /* 15px reading size */
  -webkit-font-smoothing: antialiased; overflow-x: clip;
  padding-bottom: env(safe-area-inset-bottom);
}
a { color: inherit; text-decoration: none; }
main { max-width: 760px; margin: 0 auto; padding: 0 1rem; overflow-x: clip; }
.ic { flex: none; display: inline-block; vertical-align: -2px; }
code { font-family: var(--font-mono); font-size: 0.85em; padding: 0.1em 0.35em; border-radius: 4px; background: var(--raised); }

/* ---- top bar (glass) ---- */
.top {
  position: sticky; top: 0; z-index: 10;
  display: flex; align-items: center; justify-content: space-between; gap: 0.75rem;
  /* header content aligns with the 760px reading column */
  padding: max(env(safe-area-inset-top), 0.5rem) max(1rem, calc((100% - 760px) / 2 + 1rem)) 0.5rem;
  background: color-mix(in oklch, var(--page) 78%, transparent);
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid color-mix(in oklch, var(--edge) 60%, transparent);
}
.brand { display: inline-flex; align-items: center; gap: 0.5rem; font-weight: 600; letter-spacing: 0.01em; min-height: 44px; }
.brand .dot { width: 8px; height: 8px; border-radius: 999px; background: var(--accent); box-shadow: 0 0 10px var(--accent); }
.top-actions { display: flex; align-items: center; gap: 0.375rem; }
.chip {
  display: inline-flex; align-items: center; gap: 0.25rem; min-height: 36px; padding: 0 0.75rem;
  border-radius: 10px; color: var(--ink-subtle); font-size: 0.875rem; border: 1px solid var(--edge);
  transition: background 120ms, color 120ms;
}
.chip:hover { background: var(--panel); color: var(--ink); }
.icon-btn {
  display: inline-grid; place-items: center; width: 36px; height: 36px; border-radius: 10px;
  border: 1px solid var(--edge); background: transparent; color: var(--ink-subtle); cursor: pointer;
}
.icon-btn:hover { background: var(--panel); color: var(--ink); }

/* ---- hero ---- */
.hero { padding: 2rem 0 1.25rem; }
.kicker { color: var(--accent); font-size: 0.8125rem; font-weight: 500; letter-spacing: 0.04em; }
.hero h1 { margin: 0.375rem 0 0.5rem; font-size: 1.75rem; line-height: 1.25; font-weight: 650; letter-spacing: -0.01em; }
.stats { margin: 0; color: var(--ink-subtle); font-size: 0.875rem; }
.stats strong { color: var(--ink); font-weight: 600; }

/* ---- item list (expand-in-place cards) ---- */
.list { display: flex; flex-direction: column; gap: 0.625rem; padding-bottom: 1rem; }
.item {
  scroll-margin-top: 72px;
  background: var(--panel); border: 1px solid var(--edge-card, var(--edge)); border-radius: 14px;
  transition: border-color 160ms, background 160ms;
}
.item:hover { border-color: var(--edge-strong); }
.item[open] { background: var(--panel); border-color: color-mix(in oklch, var(--accent) 35%, var(--edge)); box-shadow: var(--elev); }
.item > summary {
  list-style: none; cursor: pointer; display: flex; align-items: flex-start; gap: 0.75rem 1.25rem;
  padding: 0.875rem 0.875rem 0.875rem 1rem; min-height: 44px; -webkit-tap-highlight-color: transparent;
}
.item > summary::-webkit-details-marker { display: none; }
.item > summary:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 14px; }
.rank { flex: none; width: 1.25rem; padding-top: 0.125rem; color: var(--ink-faint); font: 500 0.8125rem/1.5 var(--font-mono); text-align: right; }
.head { flex: 1; min-width: 0; display: flex; flex-direction: column; gap: 0.3rem; }
.title { font-weight: 600; font-size: 1rem; line-height: 1.45; overflow-wrap: anywhere; }
.teaser {
  color: var(--ink-subtle); font-size: 0.875rem; line-height: 1.55;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.item[open] .teaser { display: none; }
.meta { display: flex; flex-wrap: wrap; gap: 0.25rem 0.75rem; color: var(--ink-subtle); font-size: 0.8125rem; }
.meta .src { color: var(--ink-subtle); }
.meta .eng { display: inline-flex; align-items: center; gap: 0.25rem; }
.side { flex: none; display: flex; flex-direction: column; align-items: center; gap: 0.5rem; }
.score {
  min-width: 2.25rem; height: 1.75rem; padding: 0 0.5rem; display: grid; place-items: center;
  border-radius: 999px; font: 600 0.8125rem/1 var(--font-mono);
}
.score.hi { background: var(--accent); color: var(--accent-contrast); }
.score.mid { background: var(--accent-bg); color: oklch(var(--mid-ink-l, var(--a-l)) var(--a-c) var(--a-h)); }
.score.lo { background: var(--raised); color: var(--ink-subtle); }
.chev { color: var(--ink-faint); transition: transform 180ms ease; display: grid; }
.item[open] .chev { transform: rotate(180deg); }

/* ---- detail ---- */
.detail { padding: 0 1rem 1rem 3rem; animation: fade-in 160ms ease-out; }
@keyframes fade-in { from { opacity: 0; } to { opacity: 1; } }
.blk { padding: 0.75rem 0; border-top: 1px solid color-mix(in oklch, var(--edge) 70%, transparent); }
.blk:first-child { border-top: 0; padding-top: 0.25rem; }
.blk h3 {
  display: flex; align-items: center; gap: 0.375rem; margin: 0 0 0.375rem;
  font-size: 0.8125rem; font-weight: 600; color: var(--ink-subtle); letter-spacing: 0.02em;
}
.blk-body p { margin: 0 0 0.5rem; color: var(--ink-muted); }
.blk-body p:last-child { margin-bottom: 0; }
.blk-body a { color: var(--accent); text-decoration: underline; text-underline-offset: 2px; text-decoration-thickness: 1px; }
.blk.disc { margin: 0.25rem 0 0; padding: 0.75rem 0.875rem; border: 0; border-radius: 10px; background: var(--accent-bg); }
.blk.disc h3 { color: var(--accent); }
.blk.disc .blk-body p { color: var(--ink); }
/* BuilderXAI opinion: warm (warning-hue) tint — distinct from the accent-green discussion box */
.blk.op { margin: 0.75rem 0 0; padding: 0.75rem 0.875rem; border: 0; border-radius: 10px;
  background: var(--warning-bg); box-shadow: inset 3px 0 0 var(--warning); }
.blk.op h3 { color: var(--warning); }
html[data-theme='light'] .blk.op h3 { color: oklch(0.52 0.13 70); }
.blk.op .blk-body p, .blk.op .blk-body li { color: var(--ink); }
.blk.op .blk-body ul { margin: 0.25rem 0 0.5rem; padding-left: 1.1rem; }
.op-kind, .op-flag { margin-left: 0.5rem; padding: 0.1rem 0.45rem; border-radius: 6px; font-size: 0.75rem; font-weight: 500;
  color: var(--ink-muted); background: var(--surface-3); letter-spacing: 0; }
.op-flag { color: var(--ink-muted); border: 1px dashed var(--edge-strong); background: transparent; }
.take { margin: 0 0 1rem; padding: 1rem 1.125rem; border-radius: 14px; background: var(--warning-bg);
  box-shadow: inset 3px 0 0 var(--warning); }
.take h2 { display: flex; align-items: center; gap: 0.375rem; margin: 0 0 0.5rem; font-size: 0.875rem; font-weight: 600; color: var(--warning); }
html[data-theme='light'] .take h2 { color: oklch(0.52 0.13 70); }
.take .blk-body p { margin: 0 0 0.5rem; color: var(--ink); }
.take .blk-body p:last-child { margin-bottom: 0; }
.tags { display: flex; flex-wrap: wrap; gap: 0.375rem; margin: 0.75rem 0 0.25rem; }
.tag { font-size: 0.75rem; color: var(--ink-muted); padding: 0.15rem 0.5rem; border-radius: 6px; background: var(--raised); }
.refs { margin-top: 0.5rem; font-size: 0.8125rem; color: var(--ink-subtle); }
.refs summary { cursor: pointer; min-height: 32px; display: inline-flex; align-items: center; gap: 0.25rem; color: var(--ink-subtle); text-decoration: underline dotted; text-underline-offset: 3px; }
.refs summary:hover { color: var(--accent); }
.refs ul { margin: 0.25rem 0 0; padding-left: 1.1rem; }
.refs li { margin: 0.2rem 0; overflow-wrap: anywhere; }
.refs a:hover { color: var(--accent); }
.actions { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-top: 0.875rem; }
.btn {
  display: inline-flex; align-items: center; gap: 0.375rem; min-height: 36px; padding: 0 0.875rem;
  border-radius: 10px; font-size: 0.875rem; font-weight: 500; border: 1px solid var(--edge);
  color: var(--ink); background: var(--raised); transition: filter 120ms, background 120ms;
}
.btn:hover { filter: brightness(1.08); }
.btn.primary { background: var(--accent); color: var(--accent-contrast); border-color: transparent; }
.btn.ghost { background: transparent; color: var(--ink-subtle); }

/* ---- day nav + archive ---- */
.daynav { display: flex; justify-content: space-between; padding: 0.5rem 0 1.5rem; }
.archive { display: flex; flex-direction: column; gap: 0.625rem; padding-bottom: 2rem; }
.arch { display: block; padding: 0.875rem 1rem; background: var(--panel); border: 1px solid var(--edge); border-radius: 14px; }
.arch:hover { border-color: var(--edge-strong); }
.arch-d { display: flex; justify-content: space-between; font: 600 0.9375rem var(--font-mono); }
.arch-d span { font: 400 0.8125rem var(--font-sans); color: var(--ink-faint); }
.arch ul { margin: 0.5rem 0 0; padding-left: 1.1rem; color: var(--ink-subtle); font-size: 0.875rem; }
.arch li { margin: 0.15rem 0; }
.foot { max-width: 760px; margin: 0 auto; padding: 1.5rem 1rem 2.5rem; color: var(--ink-faint); font-size: 0.75rem; text-align: center; }

/* ---- touch tier: bigger hit areas, 16px floor ---- */
@media (pointer: coarse) {
  .chip, .icon-btn, .btn { min-height: 44px; }
  .icon-btn { width: 44px; height: 44px; }
  .btn { padding: 0 1rem; font-size: 0.9375rem; }
}
@media (max-width: 520px) {
  main { padding: 0 0.75rem; }
  .hero { padding: 1.5rem 0 1rem; }
  .hero h1 { font-size: 1.5rem; }
  .detail { padding: 0 0.875rem 1rem 0.875rem; }
  .item > summary { padding: 0.875rem 0.75rem; gap: 0.625rem; }
  .rank { width: 1rem; }
  .actions .btn { flex: 1 1 auto; justify-content: center; }
}
@media (prefers-reduced-motion: reduce) { * { animation: none !important; transition: none !important; } }