/*
 * Cinematic, but never at the cost of legibility or access.
 *
 * Every animation below is opt-out via prefers-reduced-motion, and no
 * information is carried by motion or colour alone — every state that has a
 * colour also has a word.
 */

:root {
  --bg: #06070c;
  --bg-raise: #0d1018;
  --bg-card: #11151f;
  --line: #232a3a;
  --text: #e8ecf5;
  --muted: #98a2ba;
  --accent: #6ee7ff;
  --accent-deep: #2a7f95;
  --warn: #ffcc66;
  --bad: #ff7a85;
  --good: #7ce6a8;
  --unknown: #b9a7ff;
  --radius: 14px;
  --maxw: 1080px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.65 ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); }

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.9em;
  background: #ffffff0f;
  padding: 0.1em 0.35em;
  border-radius: 5px;
}

.skip {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--accent);
  color: #04121a;
  padding: 0.7rem 1rem;
  z-index: 50;
  font-weight: 700;
}
.skip:focus { left: 0; }

.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  margin: -1px; padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
}

/* ───────────────────────────── hero ───────────────────────────── */

.hero {
  position: relative;
  overflow: hidden;
  padding: clamp(3.5rem, 12vh, 8rem) 1.25rem clamp(2.5rem, 7vh, 5rem);
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(1100px 520px at 12% -10%, #16324a 0%, transparent 62%),
    radial-gradient(900px 460px at 92% 0%, #2b1f4a 0%, transparent 58%),
    var(--bg);
}

.hero-grid {
  position: absolute;
  inset: -40% -10% auto -10%;
  height: 160%;
  background-image:
    linear-gradient(to right, #ffffff0a 1px, transparent 1px),
    linear-gradient(to bottom, #ffffff0a 1px, transparent 1px);
  background-size: 58px 58px;
  transform: perspective(680px) rotateX(58deg);
  transform-origin: top center;
  mask-image: linear-gradient(to bottom, #000 0%, transparent 72%);
  animation: drift 26s linear infinite;
  pointer-events: none;
}

@keyframes drift {
  from { background-position: 0 0; }
  to { background-position: 0 58px; }
}

.hero-inner {
  position: relative;
  max-width: var(--maxw);
  margin: 0 auto;
}

.eyebrow {
  margin: 0 0 0.6rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  font-size: 0.72rem;
  color: var(--muted);
}

.title {
  margin: 0 0 1.1rem;
  font-size: clamp(3rem, 12vw, 7rem);
  line-height: 0.95;
  letter-spacing: -0.045em;
  font-weight: 800;
}

.title .accent {
  background: linear-gradient(100deg, var(--accent), #b98cff 65%, #ff9ecd);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.lede {
  max-width: 62ch;
  font-size: clamp(1.02rem, 2.1vw, 1.22rem);
  color: #cfd7e8;
}

.disclaimer {
  max-width: 68ch;
  margin-top: 1.6rem;
  padding: 0.9rem 1.1rem;
  border: 1px solid var(--line);
  border-left: 4px solid var(--warn);
  border-radius: 10px;
  background: #ffcc660d;
  color: #e5dcc6;
  font-size: 0.92rem;
}

/* Staged entrance. Purely decorative: content is present and readable
   even if the animation never runs. */
.reveal {
  display: inline-block;
  animation: rise 900ms cubic-bezier(0.16, 0.9, 0.28, 1) both;
}
.lede.reveal { display: block; animation-delay: 120ms; }
.disclaimer.reveal { display: block; animation-delay: 240ms; }
.title .accent.reveal { animation-delay: 90ms; }

@keyframes rise {
  from { opacity: 0; transform: translateY(22px); filter: blur(6px); }
  to { opacity: 1; transform: none; filter: none; }
}

/* ───────────────────────────── layout ───────────────────────────── */

main {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 1.25rem 5rem;
}

.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  position: sticky;
  top: 0;
  z-index: 20;
  padding: 0.9rem 0;
  background: linear-gradient(to bottom, var(--bg) 72%, transparent);
}

.tab {
  flex: 1 1 auto;
  padding: 0.75rem 1.1rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--bg-raise);
  color: var(--muted);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  transition: color 180ms ease, border-color 180ms ease, background 180ms ease;
}
.tab:hover { color: var(--text); border-color: var(--accent-deep); }
.tab[aria-selected="true"] {
  color: #04121a;
  background: linear-gradient(100deg, var(--accent), #a9c4ff);
  border-color: transparent;
}

.section-title {
  font-size: clamp(1.5rem, 4vw, 2.1rem);
  letter-spacing: -0.02em;
  margin: 2rem 0 0.5rem;
}

.sub-title {
  margin: 2.4rem 0 0.6rem;
  font-size: 1.05rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
}

.section-lede { max-width: 70ch; color: #c3ccdf; }

.muted { color: var(--muted); }

/* ───────────────────────────── controls ───────────────────────────── */

.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
  align-items: flex-end;
  margin: 1.2rem 0;
}

.field { display: flex; flex-direction: column; gap: 0.35rem; flex: 1 1 220px; }
.field > span { font-size: 0.8rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); }

select, input, button {
  font: inherit;
  color: var(--text);
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.65rem 0.8rem;
  min-height: 44px;
}

button {
  cursor: pointer;
  font-weight: 600;
  transition: border-color 160ms ease, background 160ms ease;
}
button:hover { border-color: var(--accent-deep); background: #172033; }

button.danger { border-color: #ff7a8555; color: var(--bad); }
button.danger:hover { background: #ff7a8518; border-color: var(--bad); }

.privacy-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  align-items: center;
  justify-content: space-between;
  padding: 0.8rem 1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--bg-raise);
  margin-top: 1.2rem;
}

.error { color: var(--bad); min-height: 1.4em; margin: 0.2rem 0 0; }

/* ───────────────────────────── diff output ───────────────────────────── */

.meta-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 0.9rem;
  margin: 1rem 0;
}

.meta-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--bg-card);
  padding: 0.9rem 1rem;
}
.meta-card h3 { margin: 0 0 0.4rem; font-size: 0.95rem; }
.meta-card dl { margin: 0; display: grid; grid-template-columns: auto 1fr; gap: 0.2rem 0.7rem; font-size: 0.86rem; }
.meta-card dt { color: var(--muted); }
.meta-card dd { margin: 0; }

.caveats:empty { display: none; }
.caveats {
  border: 1px solid var(--line);
  border-left: 4px solid var(--warn);
  border-radius: 10px;
  background: #ffcc660d;
  padding: 0.85rem 1rem;
  margin: 1rem 0;
  font-size: 0.92rem;
}
.caveats p { margin: 0.3rem 0; }

.summary {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin: 1rem 0;
}

.chip {
  display: inline-flex;
  align-items: baseline;
  gap: 0.45rem;
  padding: 0.4rem 0.8rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--bg-card);
  font-size: 0.86rem;
}
.chip b { font-size: 1rem; }

.filter-row { display: flex; flex-wrap: wrap; gap: 0.5rem; margin: 0.8rem 0 1.2rem; }
.filter-row button[aria-pressed="true"] { border-color: var(--accent); color: var(--accent); }

.entries { list-style: none; margin: 0; padding: 0; display: grid; gap: 0.7rem; }

.entry {
  border: 1px solid var(--line);
  border-left: 4px solid var(--line);
  border-radius: var(--radius);
  background: var(--bg-card);
  padding: 0.85rem 1rem;
}
.entry[data-kind="recoded"] { border-left-color: var(--accent); }
.entry[data-kind="removed"] { border-left-color: var(--bad); }
.entry[data-kind="added"] { border-left-color: var(--good); }
.entry[data-kind="changed"] { border-left-color: var(--warn); }
.entry[data-kind="unknown-removed"],
.entry[data-kind="unknown-added"] { border-left-color: var(--unknown); border-style: dashed; }
.entry[data-kind="unchanged"] { opacity: 0.72; }

.entry-head { display: flex; flex-wrap: wrap; gap: 0.5rem; align-items: baseline; }
.entry-kind {
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 0.15rem 0.5rem;
  border-radius: 999px;
  border: 1px solid currentColor;
}
.entry-code { font-family: ui-monospace, monospace; color: var(--muted); }
.entry-title { font-weight: 650; }
.entry ul { margin: 0.5rem 0 0; padding-left: 1.1rem; font-size: 0.88rem; color: #c3ccdf; }
.entry .unknown-note { color: var(--unknown); }

.sources { margin-top: 2rem; border: 1px solid var(--line); border-radius: var(--radius); background: var(--bg-raise); padding: 0.8rem 1rem; }
.sources summary { cursor: pointer; font-weight: 600; }
.sources h4 { margin: 1rem 0 0.3rem; }
.sources ul { font-size: 0.9rem; color: #c3ccdf; }

/* ───────────────────────────── time machine ───────────────────────────── */

.transcript { width: 100%; border-collapse: collapse; margin-top: 0.8rem; font-size: 0.93rem; }
.transcript th, .transcript td { text-align: left; padding: 0.55rem 0.6rem; border-bottom: 1px solid var(--line); }
.transcript th { color: var(--muted); font-size: 0.78rem; letter-spacing: 0.08em; text-transform: uppercase; }
.transcript td:first-child { font-family: ui-monospace, monospace; }
.transcript button { padding: 0.3rem 0.6rem; min-height: 36px; font-size: 0.82rem; }
.transcript tr[data-conditional="true"] td { background: #ffcc660d; }

.standing {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 0.9rem;
  margin-top: 0.8rem;
}

.stat {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--bg-card);
  padding: 0.9rem 1rem;
}
.stat dt { font-size: 0.75rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--muted); }
.stat dd { margin: 0.3rem 0 0; font-size: 1.65rem; font-weight: 700; letter-spacing: -0.02em; }
.stat .note { font-size: 0.82rem; font-weight: 400; color: var(--muted); display: block; margin-top: 0.2rem; }
.stat[data-state="good"] dd { color: var(--good); }
.stat[data-state="bad"] dd { color: var(--bad); }
.stat[data-state="unknown"] dd { color: var(--unknown); }

.target, .whatif, .gate {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--bg-card);
  padding: 0.9rem 1rem;
  margin-top: 0.8rem;
}
.target p, .whatif p, .gate p { margin: 0.3rem 0; }
.flag { font-weight: 700; }
.flag.good { color: var(--good); }
.flag.bad { color: var(--bad); }
.flag.unknown { color: var(--unknown); }

.footer {
  border-top: 1px solid var(--line);
  background: var(--bg-raise);
  padding: 2.5rem 1.25rem 3.5rem;
}
.footer p { max-width: var(--maxw); margin: 0 auto 1rem; font-size: 0.9rem; color: #c3ccdf; }

/* ───────────────────────────── access ───────────────────────────── */

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
  .hero-grid { display: none; }
  .reveal { opacity: 1; transform: none; filter: none; }
}

@media (max-width: 640px) {
  .tabs { position: static; }
  .transcript { font-size: 0.86rem; }
}