/* ============================================================
   HIGH SPUR RAILWAY - "SIGNAL BOX" design system
   Fictional cog railway up the Sonnenberg, est. 1912.
   Swiss wayfinding: bone white, signal red, charcoal slate.
   All colours OKLCH. No frameworks.
   ============================================================ */

/* ---------- 1. tokens ---------- */
:root {
  /* surfaces */
  --paper: oklch(97.2% 0.005 240);
  --paper-2: oklch(94.6% 0.007 240);
  --paper-3: oklch(91.5% 0.009 240);
  --card: oklch(99% 0.003 240);
  /* ink */
  --ink: oklch(23% 0.012 245);
  --ink-2: oklch(38% 0.014 245);
  --ink-3: oklch(55% 0.013 245);
  --ink-4: oklch(70% 0.011 245);
  /* signal red - the one loud colour */
  --signal: oklch(56% 0.205 27);
  --signal-deep: oklch(47% 0.185 27);
  --signal-tint: oklch(93% 0.028 27);
  /* slate + alpine */
  --slate: oklch(33% 0.02 245);
  --slate-2: oklch(45% 0.018 245);
  --alpine: oklch(52% 0.075 240);
  --alpine-tint: oklch(92% 0.024 240);
  /* ok / warn (boarding states) */
  --ok: oklch(55% 0.13 155);
  --warn: oklch(70% 0.14 85);
  --ok-tint: oklch(93% 0.05 155);
  --warn-tint: oklch(94% 0.06 85);
  /* line work */
  --rule: oklch(88% 0.008 240);
  --rule-strong: oklch(74% 0.012 240);

  /* type */
  --font-display: "Archivo", "Helvetica Neue", Arial, sans-serif;
  --font-body: "Schibsted Grotesk", "Helvetica Neue", Arial, sans-serif;
  --fs-hero: clamp(2.9rem, 8.4vw, 6.8rem);
  --fs-h1: clamp(2.1rem, 4.6vw, 3.6rem);
  --fs-h2: clamp(1.5rem, 2.6vw, 2.1rem);
  --fs-h3: 1.24rem;
  --fs-body: 1.035rem;
  --fs-small: 0.9rem;
  --fs-label: 0.74rem;

  /* space scale (4pt base) */
  --s1: 0.25rem; --s2: 0.5rem; --s3: 0.75rem; --s4: 1rem;
  --s5: 1.5rem;  --s6: 2rem;   --s7: 3rem;   --s8: 4rem;
  --s9: 6rem;    --s10: 8rem;

  /* layout */
  --measure: 62ch;
  --wide: 1240px;
  --rail-h: 64px;

  /* motion */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-flap: cubic-bezier(0.34, 1.4, 0.44, 1);
  --t-fast: 140ms;
  --t-med: 260ms;
  --t-slow: 520ms;

  --radius: 3px; /* wayfinding corners stay square-ish */
}

/* night service: dark theme, same rules */
[data-theme="night"] {
  --paper: oklch(19% 0.014 250);
  --paper-2: oklch(23% 0.015 250);
  --paper-3: oklch(27% 0.016 250);
  --card: oklch(25% 0.015 250);
  --ink: oklch(93% 0.008 240);
  --ink-2: oklch(80% 0.01 240);
  --ink-3: oklch(64% 0.012 240);
  --ink-4: oklch(46% 0.013 240);
  --signal: oklch(66% 0.2 27);
  --signal-deep: oklch(74% 0.17 27);
  --signal-tint: oklch(30% 0.07 27);
  --slate: oklch(85% 0.01 245);
  --slate-2: oklch(70% 0.014 245);
  --alpine: oklch(70% 0.09 240);
  --alpine-tint: oklch(30% 0.05 240);
  --ok: oklch(72% 0.15 155);
  --warn: oklch(80% 0.14 85);
  --ok-tint: oklch(28% 0.06 155);
  --warn-tint: oklch(30% 0.06 85);
  --rule: oklch(33% 0.014 245);
  --rule-strong: oklch(48% 0.016 245);
}

/* ---------- 2. base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}
body {
  margin: 0;
  font-family: var(--font-body);
  font-size: var(--fs-body);
  font-weight: 430;
  line-height: 1.6;
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
}
img, svg, video { max-width: 100%; height: auto; display: block; }
a { color: var(--alpine); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--signal-deep); }
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 730;
  line-height: 1.04;
  letter-spacing: -0.015em;
  margin: 0 0 var(--s4);
  text-wrap: balance;
}
h1 { font-size: var(--fs-h1); font-stretch: 84%; }
h2 { font-size: var(--fs-h2); font-stretch: 88%; }
h3 { font-size: var(--fs-h3); letter-spacing: -0.005em; }
p { margin: 0 0 var(--s4); max-width: var(--measure); }
p:last-child { margin-bottom: 0; }
strong { font-weight: 680; }
code, kbd { font-family: ui-monospace, "SF Mono", Menlo, monospace; font-size: 0.88em; background: var(--paper-2); border: 1px solid var(--rule); border-radius: var(--radius); padding: 0.1em 0.4em; }
hr { border: 0; border-top: 1px solid var(--rule); margin: var(--s7) 0; }
::selection { background: var(--signal); color: white; }

/* skip link */
.skip-link {
  position: absolute; left: var(--s4); top: -64px; z-index: 200;
  background: var(--signal); color: #fff; font-family: var(--font-display);
  font-weight: 650; font-size: var(--fs-small); text-decoration: none;
  padding: var(--s2) var(--s4); border-radius: var(--radius);
  transition: top var(--t-fast) var(--ease-out);
}
.skip-link:focus-visible { top: var(--s3); color: #fff; }

/* focus */
:focus-visible { outline: 3px solid var(--signal); outline-offset: 2px; border-radius: 2px; }

/* ---------- 3. layout primitives ---------- */
.wrap { max-width: var(--wide); margin-inline: auto; padding-inline: clamp(1rem, 4vw, 2.5rem); }
.section { padding-block: var(--s9); }
.section--tight { padding-block: var(--s7); }
.section--rule { border-top: 1px solid var(--rule); }
.grid { display: grid; gap: var(--s5); }
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
@media (max-width: 960px) {
  .grid-3, .grid-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 640px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
}

/* signage label - the Swiss eyebrow */
.signage {
  font-family: var(--font-display);
  font-stretch: 76%;
  font-weight: 640;
  font-size: var(--fs-label);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-3);
  display: inline-flex; align-items: center; gap: var(--s2);
}
.signage::before {
  content: ""; width: 10px; height: 10px; background: var(--signal);
  transform: rotate(45deg); flex: none;
}
.signage--quiet::before { background: var(--ink-4); }

/* section headers with index numbers, wayfinding style */
.sec-head { display: flex; align-items: baseline; gap: var(--s4); margin-bottom: var(--s6); }
.sec-head .idx {
  font-family: var(--font-display); font-stretch: 62%; font-weight: 200;
  font-size: clamp(2.6rem, 5vw, 4rem); line-height: 1; color: var(--rule-strong);
}
.sec-head h2 { margin: 0; }

/* buttons */
.btn {
  display: inline-flex; align-items: center; gap: var(--s2);
  font-family: var(--font-display); font-stretch: 80%; font-weight: 660;
  font-size: 0.92rem; letter-spacing: 0.06em; text-transform: uppercase;
  text-decoration: none; color: var(--ink); background: transparent;
  border: 1.5px solid var(--ink); border-radius: var(--radius);
  padding: 0.72rem 1.3rem; cursor: pointer;
  transition: background var(--t-fast) var(--ease-out), color var(--t-fast) var(--ease-out), border-color var(--t-fast) var(--ease-out), transform var(--t-fast) var(--ease-out);
}
.btn:hover { background: var(--ink); color: var(--paper); }
.btn:active { transform: translateY(1px); }
.btn--signal { background: var(--signal); border-color: var(--signal); color: #fff; }
.btn--signal:hover { background: var(--signal-deep); border-color: var(--signal-deep); color: #fff; }
.btn--small { padding: 0.45rem 0.85rem; font-size: 0.8rem; }
.btn[aria-disabled="true"], .btn:disabled { opacity: 0.45; cursor: not-allowed; }

/* links styled as wayfinding arrows */
.arrow-link {
  font-family: var(--font-display); font-stretch: 80%; font-weight: 660;
  font-size: 0.9rem; letter-spacing: 0.06em; text-transform: uppercase;
  color: var(--ink); text-decoration: none; display: inline-flex; align-items: center; gap: 0.5em;
}
.arrow-link .arr { transition: transform var(--t-fast) var(--ease-out); }
.arrow-link:hover { color: var(--signal-deep); }
.arrow-link:hover .arr { transform: translateX(6px); }

/* ---------- 4. header / nav ---------- */
.rail {
  position: sticky; top: 0; z-index: 100;
  background: color-mix(in oklab, var(--paper) 88%, transparent);
  backdrop-filter: blur(10px) saturate(1.2);
  border-bottom: 1px solid transparent;
  transition: border-color var(--t-med) var(--ease-out), box-shadow var(--t-med) var(--ease-out);
}
.rail.is-stuck { border-bottom-color: var(--rule); box-shadow: 0 8px 30px -18px oklch(20% 0.02 240 / 0.5); }
.rail__inner {
  max-width: var(--wide); margin-inline: auto; padding-inline: clamp(1rem, 4vw, 2.5rem);
  height: var(--rail-h); display: flex; align-items: center; gap: var(--s5);
}
.wordmark {
  font-family: var(--font-display); font-stretch: 78%; font-weight: 780;
  font-size: 1.06rem; letter-spacing: 0.02em; text-transform: uppercase;
  text-decoration: none; color: var(--ink); display: flex; align-items: center; gap: 0.55em;
  white-space: nowrap;
}
.wordmark .mark {
  width: 26px; height: 26px; flex: none; background: var(--signal); color: #fff;
  display: grid; place-items: center; border-radius: 2px;
  font-size: 15px; font-stretch: 62%; font-weight: 800; letter-spacing: 0;
}
.wordmark small { font-weight: 480; font-stretch: 82%; color: var(--ink-3); letter-spacing: 0.08em; }
.rail__nav { margin-left: auto; }
.rail__nav ul { display: flex; gap: var(--s4); list-style: none; margin: 0; padding: 0; }
.rail__nav a {
  font-family: var(--font-display); font-stretch: 82%; font-weight: 570;
  font-size: 0.86rem; letter-spacing: 0.05em; text-transform: uppercase;
  text-decoration: none; color: var(--ink-2); padding: 0.4rem 0.1rem; position: relative;
}
.rail__nav a::after {
  content: ""; position: absolute; left: 0; right: 100%; bottom: 0;
  height: 2px; background: var(--signal);
  transition: right var(--t-med) var(--ease-out);
}
.rail__nav a:hover, .rail__nav a[aria-current="page"] { color: var(--ink); }
.rail__nav a:hover::after, .rail__nav a[aria-current="page"]::after { right: 0; }
.rail__actions { display: flex; align-items: center; gap: var(--s3); }
.theme-toggle {
  border: 1.5px solid var(--rule-strong); background: transparent; color: var(--ink-2);
  font-family: var(--font-display); font-stretch: 80%; font-weight: 620;
  font-size: 0.72rem; letter-spacing: 0.1em; text-transform: uppercase;
  padding: 0.45rem 0.7rem; border-radius: var(--radius); cursor: pointer;
  display: inline-flex; gap: 0.45em; align-items: center;
  transition: border-color var(--t-fast) var(--ease-out), color var(--t-fast) var(--ease-out);
}
.theme-toggle:hover { border-color: var(--ink); color: var(--ink); }
.burger { display: none; background: none; border: 0; cursor: pointer; padding: var(--s2); }
.burger span { display: block; width: 22px; height: 2px; background: var(--ink); margin: 5px 0; transition: transform var(--t-fast) var(--ease-out), opacity var(--t-fast); }
@media (max-width: 880px) {
  .burger { display: block; }
  .rail__nav {
    position: fixed; inset: var(--rail-h) 0 auto 0; margin: 0;
    background: var(--paper); border-bottom: 1px solid var(--rule);
    padding: var(--s5) clamp(1rem, 4vw, 2.5rem) var(--s7);
    transform: translateY(-110%); transition: transform var(--t-slow) var(--ease-out);
    z-index: 90; box-shadow: 0 30px 60px -30px oklch(15% 0.02 240 / 0.6);
  }
  .rail__nav.is-open { transform: translateY(0); }
  .rail__nav ul { flex-direction: column; gap: var(--s3); }
  .rail__nav a { font-size: 1.25rem; }
}

/* ---------- 5. hero ---------- */
.hero {
  position: relative; overflow: hidden;
  padding-block: clamp(3rem, 9vw, 7rem) var(--s8);
  background:
    linear-gradient(180deg, var(--paper) 0%, var(--paper-2) 100%);
}
.hero::before {
  /* altitude hairlines */
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background: repeating-linear-gradient(180deg, transparent 0 119px, var(--rule) 119px 120px);
  mask-image: linear-gradient(180deg, #000 0%, transparent 85%);
  opacity: 0.7;
}
.hero__grid { position: relative; display: grid; gap: var(--s7); grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr); align-items: start; }
@media (max-width: 960px) { .hero__grid { grid-template-columns: 1fr; } }
.hero h1 { font-size: var(--fs-hero); font-stretch: 76%; font-weight: 800; letter-spacing: -0.02em; margin-bottom: var(--s5); }
.hero h1 .alt { color: var(--signal); }
.hero__lede { font-size: clamp(1.05rem, 1.7vw, 1.3rem); line-height: 1.5; color: var(--ink-2); max-width: 46ch; margin-bottom: var(--s6); }
.hero__meta { display: flex; flex-wrap: wrap; gap: var(--s5) var(--s7); margin-top: var(--s6); }
.hero__meta div dt { font-family: var(--font-display); font-stretch: 74%; font-weight: 620; font-size: var(--fs-label); letter-spacing: 0.14em; text-transform: uppercase; color: var(--ink-3); margin-bottom: 0.2rem; }
.hero__meta div dd { margin: 0; font-family: var(--font-display); font-stretch: 82%; font-weight: 700; font-size: 1.15rem; }

/* the mountain profile svg */
.profile-svg { width: 100%; height: auto; }
.profile-svg .route { fill: none; stroke: var(--signal); stroke-width: 3; stroke-linecap: round;
  stroke-dasharray: 1; stroke-dashoffset: 1; animation: drawroute 2.4s var(--ease-out) 0.4s forwards; }
@keyframes drawroute { to { stroke-dashoffset: 0; } }
.profile-svg .ridge { fill: none; stroke: var(--rule-strong); stroke-width: 1.5; }
.profile-svg .marker { fill: var(--ink); }
.profile-svg .marker--signal { fill: var(--signal); }
.profile-svg text { font-family: var(--font-display); font-stretch: 74%; font-weight: 620; letter-spacing: 0.1em; fill: var(--ink-3); }

/* ---------- 6. split-flap departure board (motion signature) ---------- */
.flap-board {
  background: oklch(21% 0.014 250); color: oklch(94% 0.005 90);
  border-radius: var(--radius); padding: var(--s4);
  box-shadow: inset 0 2px 0 oklch(100% 0 0 / 0.06), inset 0 -2px 0 oklch(0% 0 0 / 0.35), 0 24px 50px -24px oklch(15% 0.03 250 / 0.8);
  font-family: var(--font-display); font-stretch: 72%;
}
.flap-board__head {
  display: grid; grid-template-columns: 5ch 1fr 8ch 6ch; gap: var(--s3);
  font-size: 0.62rem; letter-spacing: 0.18em; text-transform: uppercase;
  color: oklch(70% 0.01 250); padding: 0 var(--s2) var(--s3); border-bottom: 1px solid oklch(35% 0.015 250);
}
.flap-board__head span:nth-child(3), .flap-board__head span:nth-child(4) { text-align: right; }
.flap-row {
  display: grid; grid-template-columns: 5ch 1fr 8ch 6ch; gap: var(--s3); align-items: center;
  padding: var(--s2) 0; border-bottom: 1px solid oklch(30% 0.014 250);
}
.flap-row:last-child { border-bottom: 0; }
.flap {
  font-stretch: 68%; font-weight: 700; font-size: clamp(0.9rem, 1.6vw, 1.15rem);
  background: oklch(27% 0.015 250); border-radius: 2px; padding: 0.3em 0.5em;
  display: inline-block; min-width: 5ch; text-align: center;
  box-shadow: inset 0 1px 0 oklch(100% 0 0 / 0.05), inset 0 -1px 0 oklch(0% 0 0 / 0.3);
  perspective: 300px;
}
.flap--dest { text-align: left; font-stretch: 76%; }
.flap--status { font-stretch: 80%; font-weight: 640; font-size: 0.78rem; letter-spacing: 0.08em; }
.flap.is-flipping { animation: flapturn 0.42s var(--ease-flap); }
@keyframes flapturn {
  0% { transform: rotateX(0); }
  45% { transform: rotateX(-88deg); filter: brightness(0.55); }
  55% { transform: rotateX(88deg); filter: brightness(0.55); }
  100% { transform: rotateX(0); }
}
.flap--ok { color: oklch(80% 0.16 155); }
.flap--warn { color: oklch(83% 0.14 85); }
.flap--info { color: oklch(75% 0.09 240); }
.flap-board__foot { display: flex; justify-content: space-between; align-items: center; padding-top: var(--s3); font-size: 0.66rem; letter-spacing: 0.16em; text-transform: uppercase; color: oklch(60% 0.01 250); }
.flap-board__foot .dot { width: 8px; height: 8px; border-radius: 50%; background: oklch(70% 0.2 145); display: inline-block; margin-right: 0.5em; animation: pulse 2.2s infinite; }
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.35; } }

/* ---------- 7. cards ---------- */
.card {
  background: var(--card); border: 1px solid var(--rule); border-radius: var(--radius);
  padding: var(--s5); position: relative; overflow: hidden;
  transition: transform var(--t-med) var(--ease-out), box-shadow var(--t-med) var(--ease-out), border-color var(--t-med) var(--ease-out);
}
.card::before {
  content: ""; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: var(--signal); transform: scaleX(0); transform-origin: left;
  transition: transform var(--t-med) var(--ease-out);
}
.card:hover { transform: translateY(-4px); box-shadow: 0 24px 44px -30px oklch(20% 0.03 245 / 0.55); border-color: var(--rule-strong); }
.card:hover::before { transform: scaleX(1); }
.card h3 { margin-bottom: var(--s2); }
.card p { font-size: var(--fs-small); color: var(--ink-2); }
.card .signage { margin-bottom: var(--s3); }
.card__foot { margin-top: var(--s4); }
.card--flat:hover { transform: none; box-shadow: none; }

/* timetable cards */
.tt-card .line-badge {
  display: inline-grid; place-items: center; width: 2.4rem; height: 2.4rem;
  background: var(--ink); color: var(--paper); border-radius: 2px;
  font-family: var(--font-display); font-stretch: 70%; font-weight: 800; font-size: 1.05rem;
  margin-bottom: var(--s3);
}
.tt-card--signal .line-badge { background: var(--signal); }

/* ---------- 8. data tables (timetable, fares) ---------- */
.table-wrap { overflow-x: auto; border: 1px solid var(--rule); border-radius: var(--radius); background: var(--card); }
table { border-collapse: collapse; width: 100%; min-width: 560px; font-size: var(--fs-small); }
caption { text-align: left; font-family: var(--font-display); font-stretch: 76%; font-weight: 650; letter-spacing: 0.1em; text-transform: uppercase; font-size: var(--fs-label); color: var(--ink-3); padding: var(--s4) var(--s4) var(--s2); }
thead th {
  font-family: var(--font-display); font-stretch: 76%; font-weight: 650; font-size: var(--fs-label);
  letter-spacing: 0.12em; text-transform: uppercase; color: var(--ink-3); text-align: left;
  padding: var(--s3) var(--s4); border-bottom: 2px solid var(--ink); white-space: nowrap;
}
tbody td { padding: var(--s3) var(--s4); border-bottom: 1px solid var(--rule); vertical-align: middle; }
tbody tr:last-child td { border-bottom: 0; }
tbody tr { transition: background var(--t-fast) var(--ease-out); }
tbody tr:hover { background: var(--paper-2); }
tbody tr.is-live { background: var(--signal-tint); }
tbody tr.is-live td:first-child { box-shadow: inset 3px 0 0 var(--signal); }
.num { font-variant-numeric: tabular-nums; font-feature-settings: "tnum"; }
.status-chip {
  display: inline-block; font-family: var(--font-display); font-stretch: 78%; font-weight: 660;
  font-size: 0.68rem; letter-spacing: 0.1em; text-transform: uppercase;
  padding: 0.28em 0.7em; border-radius: 999px; border: 1px solid currentColor;
}
.status-chip--ok { color: var(--ok); background: var(--ok-tint); }
.status-chip--warn { color: oklch(48% 0.12 85); background: var(--warn-tint); }
.status-chip--info { color: var(--alpine); background: var(--alpine-tint); }
[data-theme="night"] .status-chip--warn { color: var(--warn); }

/* ---------- 9. forms + states ---------- */
.form-card { background: var(--card); border: 1px solid var(--rule); border-radius: var(--radius); padding: var(--s6); max-width: 620px; }
.field { margin-bottom: var(--s5); }
.field label, .field .legend {
  display: block; font-family: var(--font-display); font-stretch: 78%; font-weight: 640;
  font-size: var(--fs-label); letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--ink-2); margin-bottom: var(--s2);
}
.field input, .field select, .field textarea {
  width: 100%; font: inherit; color: var(--ink); background: var(--paper);
  border: 1.5px solid var(--rule-strong); border-radius: var(--radius);
  padding: 0.7rem 0.85rem; transition: border-color var(--t-fast) var(--ease-out), box-shadow var(--t-fast) var(--ease-out);
}
.field input:hover, .field select:hover, .field textarea:hover { border-color: var(--ink-3); }
.field input:focus, .field select:focus, .field textarea:focus { outline: none; border-color: var(--ink); box-shadow: 0 0 0 3px var(--alpine-tint); }
.field input:user-invalid, .field textarea:user-invalid { border-color: var(--signal); box-shadow: 0 0 0 3px var(--signal-tint); }
.field .hint { font-size: var(--fs-small); color: var(--ink-3); margin-top: var(--s1); }
.field .err { display: none; font-size: var(--fs-small); color: var(--signal-deep); margin-top: var(--s1); font-weight: 560; }
.field.is-error .err { display: block; }
fieldset { border: 0; padding: 0; margin: 0 0 var(--s5); }
.checkbox-row { display: flex; gap: var(--s2); align-items: flex-start; font-size: var(--fs-small); color: var(--ink-2); }
.checkbox-row input { width: 1.05rem; height: 1.05rem; accent-color: var(--signal); margin-top: 0.2rem; }
.form-note { display: flex; gap: var(--s2); align-items: flex-start; background: var(--alpine-tint); border: 1px solid color-mix(in oklab, var(--alpine) 35%, transparent); border-radius: var(--radius); padding: var(--s3) var(--s4); font-size: var(--fs-small); color: var(--ink-2); margin-bottom: var(--s5); }
/* loading / empty / error states */
.state-block { border: 1.5px dashed var(--rule-strong); border-radius: var(--radius); padding: var(--s7) var(--s5); text-align: center; color: var(--ink-3); }
.state-block h3 { color: var(--ink-2); }
.spinner { width: 22px; height: 22px; border-radius: 50%; border: 2.5px solid var(--rule-strong); border-top-color: var(--signal); display: inline-block; vertical-align: -4px; animation: spin 0.8s linear infinite; margin-right: 0.5em; }
@keyframes spin { to { transform: rotate(360deg); } }
.btn.is-loading { pointer-events: none; opacity: 0.7; }
.toast {
  position: fixed; left: 50%; bottom: 1.4rem; transform: translate(-50%, 140%); z-index: 300;
  background: var(--ink); color: var(--paper); font-size: var(--fs-small); font-weight: 560;
  padding: 0.7rem 1.2rem; border-radius: var(--radius); box-shadow: 0 20px 40px -18px oklch(10% 0.02 250 / 0.7);
  transition: transform var(--t-slow) var(--ease-flap); max-width: min(92vw, 480px); text-align: center;
}
.toast.is-up { transform: translate(-50%, 0); }

/* ---------- 10. timeline (history) ---------- */
.timeline { position: relative; margin-left: 0.4rem; padding-left: var(--s6); border-left: 2px solid var(--rule-strong); }
.timeline li { position: relative; margin-bottom: var(--s6); list-style: none; }
.timeline li::before {
  content: ""; position: absolute; left: calc(-1 * var(--s6) - 7px); top: 0.45em;
  width: 12px; height: 12px; border-radius: 50%; background: var(--paper);
  border: 3px solid var(--signal);
}
.timeline .yr { font-family: var(--font-display); font-stretch: 70%; font-weight: 780; font-size: 1.3rem; color: var(--signal-deep); display: block; margin-bottom: 0.2rem; }

/* ---------- 11. faq accordion ---------- */
details.faq { border: 1px solid var(--rule); border-radius: var(--radius); background: var(--card); margin-bottom: var(--s3); overflow: hidden; }
details.faq summary {
  cursor: pointer; list-style: none; padding: var(--s4) var(--s5);
  font-family: var(--font-display); font-stretch: 82%; font-weight: 680; font-size: 1.02rem;
  display: flex; justify-content: space-between; gap: var(--s4); align-items: center;
  transition: background var(--t-fast) var(--ease-out);
}
details.faq summary::-webkit-details-marker { display: none; }
details.faq summary:hover { background: var(--paper-2); }
details.faq summary::after { content: "+"; font-family: var(--font-display); font-weight: 300; font-size: 1.5rem; color: var(--signal); transition: transform var(--t-med) var(--ease-out); flex: none; }
details.faq[open] summary::after { transform: rotate(45deg); }
details.faq .faq__a { padding: 0 var(--s5) var(--s5); color: var(--ink-2); }
details.faq .faq__a p:last-child { margin-bottom: 0; }

/* ---------- 12. stats strip ---------- */
.stats { display: grid; grid-template-columns: repeat(4, minmax(0,1fr)); gap: var(--s5); border-block: 1px solid var(--rule); padding-block: var(--s6); }
@media (max-width: 720px) { .stats { grid-template-columns: repeat(2, minmax(0,1fr)); } }
.stat .n { font-family: var(--font-display); font-stretch: 66%; font-weight: 800; font-size: clamp(2.2rem, 4.5vw, 3.4rem); line-height: 1; color: var(--ink); font-variant-numeric: tabular-nums; }
.stat .l { font-family: var(--font-display); font-stretch: 74%; font-weight: 620; font-size: var(--fs-label); letter-spacing: 0.14em; text-transform: uppercase; color: var(--ink-3); margin-top: var(--s2); }

/* ---------- 13. reveal-on-scroll (IO adds .in) ---------- */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity 0.7s var(--ease-out), transform 0.7s var(--ease-out); transition-delay: var(--rd, 0ms); }
.reveal.in { opacity: 1; transform: none; }
.reveal-l { opacity: 0; transform: translateX(-26px); transition: opacity 0.7s var(--ease-out), transform 0.7s var(--ease-out); transition-delay: var(--rd, 0ms); }
.reveal-l.in { opacity: 1; transform: none; }
.reveal-s { opacity: 0; transform: scale(0.96); transition: opacity 0.6s var(--ease-out), transform 0.6s var(--ease-out); transition-delay: var(--rd, 0ms); }
.reveal-s.in { opacity: 1; transform: none; }

/* scroll-driven upgrades where supported */
@supports (animation-timeline: view()) {
  .reveal, .reveal-l, .reveal-s { opacity: 1; transform: none; transition: none; }
  .reveal { animation: reveal-up both; animation-timeline: view(); animation-range: entry 0% entry 42%; }
  .reveal-l { animation: reveal-left both; animation-timeline: view(); animation-range: entry 0% entry 42%; }
  .reveal-s { animation: reveal-scale both; animation-timeline: view(); animation-range: entry 0% entry 40%; }
  @keyframes reveal-up { from { opacity: 0; transform: translateY(26px); } to { opacity: 1; transform: none; } }
  @keyframes reveal-left { from { opacity: 0; transform: translateX(-26px); } to { opacity: 1; transform: none; } }
  @keyframes reveal-scale { from { opacity: 0; transform: scale(0.96); } to { opacity: 1; transform: none; } }
}

/* ---------- 14. page transitions ---------- */
@view-transition { navigation: auto; }
@supports (view-transition-name: root) {
  html::view-transition-old(root) { animation: hs-out 240ms var(--ease-out) both; }
  html::view-transition-new(root) { animation: hs-in 300ms var(--ease-out) both; }
  @keyframes hs-out { to { opacity: 0; transform: translateY(-10px); } }
  @keyframes hs-in { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: none; } }
}

/* ---------- 15. footer ---------- */
.foot {
  margin-top: var(--s9); border-top: 1px solid var(--rule-strong); background: var(--paper-2);
  padding-block: var(--s8) var(--s6);
}
.foot__grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: var(--s6); margin-bottom: var(--s7); }
@media (max-width: 880px) { .foot__grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 560px) { .foot__grid { grid-template-columns: 1fr; } }
.foot h4 { font-family: var(--font-display); font-stretch: 76%; font-weight: 660; font-size: var(--fs-label); letter-spacing: 0.16em; text-transform: uppercase; color: var(--ink-3); margin-bottom: var(--s3); }
.foot ul { list-style: none; margin: 0; padding: 0; display: grid; gap: var(--s2); }
.foot a { color: var(--ink-2); text-decoration: none; font-size: var(--fs-small); }
.foot a:hover { color: var(--signal-deep); text-decoration: underline; }
.foot__base { display: flex; flex-wrap: wrap; gap: var(--s3) var(--s6); justify-content: space-between; border-top: 1px solid var(--rule); padding-top: var(--s5); font-size: var(--fs-small); color: var(--ink-3); }
.foot .fiction-note { font-size: var(--fs-label); letter-spacing: 0.04em; max-width: 60ch; }

/* ---------- 16. notice strip (fiction disclosure) ---------- */
.notice {
  background: var(--slate); color: oklch(96% 0.004 240);
  font-family: var(--font-display); font-stretch: 78%; font-weight: 520;
  font-size: 0.76rem; letter-spacing: 0.05em;
  padding: var(--s2) 0; text-align: center;
}
.notice a { color: oklch(88% 0.02 90); }

/* ---------- 17. reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important; animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important; scroll-behavior: auto !important;
  }
  .reveal, .reveal-l, .reveal-s { opacity: 1 !important; transform: none !important; }
  .flap.is-flipping { animation: none !important; }
}

/* ---------- 18. print ---------- */
@media print {
  .rail, .flap-board, .btn, .notice, .foot__grid, .burger, .theme-toggle { display: none !important; }
  body { background: #fff; color: #000; font-size: 11pt; }
  a { color: #000; text-decoration: underline; }
  .section { padding-block: 1rem; }
}

/* ---------- 19. inline link resets ---------- */
.plain-link { color: inherit; text-decoration: none; }
.plain-link:hover { color: var(--signal-deep); text-decoration: underline; text-decoration-thickness: 2px; }