:root {
  /* Brand */
  --amber: #F5A100;
  --amber-2: #FFB726;
  --amber-3: #FFD68A;
  --amber-deep: #E08A00;
  --amber-deep-2: #B86F00;
  --success: #39D6A5;
  --danger: #c0392b;
  --info: #7AB7FF;

  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

  /* Easing */
  --ease: cubic-bezier(.2,.8,.2,1);
  --ease-out: cubic-bezier(.16,1,.3,1);
  --ease-in: cubic-bezier(.7,0,.84,0);

  /* Radius */
  --r-xs: 4px;
  --r-s: 8px;
  --r-m: 10px;
  --r-l: 16px;
  --r-xl: 24px;
  --r-circle: 50%;

  /* Spacing */
  --s1: 4px;
  --s2: 8px;
  --s3: 12px;
  --s4: 16px;
  --s5: 24px;
  --s6: 32px;
  --s7: 48px;
  --s8: 72px;
  --s9: 96px;

  /* Shadows (Light by default) */
  --sh-1: 0 1px 0 rgba(255,255,255,.04) inset, 0 1px 2px rgba(0,0,0,.4);
  --sh-2: 0 10px 30px rgba(0,0,0,.5), 0 2px 8px rgba(0,0,0,.3);
  --sh-glow: 0 0 0 1px rgba(245,161,0,.35), 0 10px 40px rgba(245,161,0,.18);
  --sh-card-lift: 0 1px 0 rgba(255,255,255,1) inset, 0 30px 60px -20px rgba(15,15,20,.18), 0 12px 24px -8px rgba(15,15,20,.1), 0 0 0 1px rgba(0,0,0,.04);
}

html[data-theme="light"], :root {
  color-scheme: light;
  --bg: #FAFAFA;
  --bg-2: #F2F2F4;
  --surface: #FFFFFF;
  --surface-2: #F6F6F8;
  --border: rgba(0,0,0,.08);
  --border-2: rgba(0,0,0,.14);
  --ink: #0C0C0E;
  --ink-2: #2B2B30;
  --muted: #6B6B72;
  --muted-2: #9A9AA3;
  --chip: rgba(0,0,0,.05);
  --danger: #c0392b;
  --nav-glass: color-mix(in srgb, #FAFAFA 78%, transparent);
}

html[data-theme="dark"] {
  color-scheme: dark;
  --bg: #0C0C0E;
  --bg-2: #111114;
  --surface: #17171B;
  --surface-2: #1E1E24;
  --border: rgba(255,255,255,.08);
  --border-2: rgba(255,255,255,.14);
  --ink: #F5F5F7;
  --ink-2: #C9C9CF;
  --muted: #8A8A93;
  --muted-2: #5F5F66;
  --chip: rgba(255,255,255,.06);
  --danger: #FF6B6B;
  --nav-glass: color-mix(in srgb, #0C0C0E 80%, transparent);
  --sh-card-lift: 0 1px 0 rgba(255,255,255,.1) inset, 0 30px 60px -20px rgba(0,0,0,.5), 0 12px 24px -8px rgba(0,0,0,.4), 0 0 0 1px rgba(255,255,255,.08);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  scrollbar-width: thin;
  scrollbar-color: var(--border-2) transparent;
}

::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: var(--border-2);
  border-radius: var(--r-xs);
  border: 2px solid transparent;
  background-clip: padding-box;
}
::-webkit-scrollbar-thumb:hover { background: var(--muted); background-clip: padding-box; }
::-webkit-scrollbar-corner { background: transparent; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .01ms !important;
    transition-duration: .01ms !important;
    animation-iteration-count: 1 !important;
  }
}

body {
  font-family: var(--font-family);
  background: var(--bg);
  color: var(--ink);
  font-feature-settings: "cv11", "ss01", "ss03";
  transition: background .35s var(--ease), color .35s var(--ease);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

a { text-decoration: none; color: inherit; }
button { font-family: inherit; border: none; background: none; cursor: pointer; }

/* Layout */
.container {
  width: min(1280px, 100% - 48px);
  margin-inline: auto;
}
@media (max-width: 640px) { .container { width: min(100% - 32px, 100%); } }

/* Header Nav */
nav {
  position: sticky;
  top: 0;
  z-index: 100;
  padding-top: 0;
  transition: padding-top .45s var(--ease-out);
}
.nav-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1280px;
  margin: 0 auto;
  padding: 16px 24px;
  border-radius: 0;
  background: transparent;
  border: 1px solid transparent;
  box-shadow: none;
  transition: max-width .45s var(--ease-out),
              border-radius .45s var(--ease-out),
              background .45s var(--ease-out),
              box-shadow .45s var(--ease-out),
              border-color .45s var(--ease-out);
}
nav.scrolled { padding-top: 20px; }
nav.scrolled .nav-inner {
  max-width: 1080px;
  border-radius: var(--r-l);
  background: var(--nav-glass);
  backdrop-filter: saturate(1.6) blur(22px);
  -webkit-backdrop-filter: saturate(1.6) blur(22px);
  border-color: var(--border);
  box-shadow: 0 1px 0 rgba(255,255,255,.04) inset, 0 12px 30px rgba(0,0,0,.08);
}
nav.scrolled .hide-on-scroll {
  opacity: 0;
  transform: scale(.6);
  max-width: 0;
  margin-left: -10px;
  pointer-events: none;
  overflow: hidden;
}

.brand {
  height: 28px;
  transition: transform .45s var(--ease-out);
}
nav.scrolled .brand { transform: scale(.94); }

.brand img {
  height: 100%;
  width: auto;
  display: none;
}
html[data-theme="light"] .brand img.logo-light { display: block; }
html[data-theme="dark"] .brand img.logo-dark { display: block; }

/* Theme Toggle */
.theme-toggle {
  width: 56px;
  height: 30px;
  border-radius: var(--r-s);
  background: var(--chip);
  border: 1px solid var(--border);
  position: relative;
  display: flex;
  align-items: center;
  padding: 0 4px;
  justify-content: space-between;
  color: var(--muted);
}
.theme-toggle::before {
  content: "";
  position: absolute;
  left: 3px;
  top: 3px;
  width: 22px;
  height: 22px;
  border-radius: var(--r-xs);
  background: var(--surface-2);
  transition: transform .35s var(--ease-out), background .35s var(--ease-out);
  box-shadow: 0 1px 2px rgba(0,0,0,.2);
}
html[data-theme="light"] .theme-toggle::before { transform: translateX(26px); background: var(--amber); }

.theme-toggle svg { width: 14px; height: 14px; position: relative; z-index: 1; transition: color .2s var(--ease), opacity .2s var(--ease); }
html[data-theme="light"] .icon-moon { opacity: 0; }
html[data-theme="light"] .icon-sun { opacity: 1; color: #5A3A00; }
html[data-theme="dark"] .icon-moon { opacity: 1; color: var(--ink); }
html[data-theme="dark"] .icon-sun { opacity: 0; }

.hide-on-scroll { transition: opacity .25s, transform .35s, max-width .35s, margin .35s; transform-origin: right center; }

.match-hour-banner {
  margin-top: var(--s5);
  display: flex;
  align-items: center;
  gap: var(--s3);
  padding: 14px 18px;
  border: 1px solid rgba(245,161,0,.32);
  border-radius: var(--r-l);
  background: rgba(245,161,0,.08);
  color: var(--amber-deep-2);
  transition: transform .2s var(--ease), box-shadow .2s var(--ease), background .2s var(--ease);
}
.match-hour-banner:hover { transform: translateY(-1px); box-shadow: var(--sh-card-lift); }
.match-hour-banner.is-live {
  color: #087a59;
  border-color: rgba(57,214,165,.42);
  background: rgba(57,214,165,.12);
}
html[data-theme="dark"] .match-hour-banner { color: var(--amber-2); }
html[data-theme="dark"] .match-hour-banner.is-live { color: var(--success); }
.match-hour-icon { font-size: 24px; line-height: 1; }
.match-hour-copy { flex: 1; text-align: left; line-height: 1.3; }
.match-hour-copy strong { display: block; font-size: 13px; letter-spacing: .02em; text-transform: uppercase; }
.match-hour-copy span { display: block; margin-top: 3px; font-size: 12px; opacity: .8; }
.match-hour-arrow { font-size: 22px; transition: transform .2s var(--ease); }
.match-hour-banner:hover .match-hour-arrow { transform: translateX(3px); }

@media (max-width: 640px) {
  .match-hour-banner { margin-top: var(--s3); padding: 12px 14px; }
}

/* ── Arena "what's new" announcement banner ─────────────────────────── */
.arena-news-banner {
  margin-top: var(--s3);
  display: flex;
  align-items: center;
  gap: var(--s3);
  padding: 12px 18px;
  border: 1px solid rgba(37,99,235,.28);
  border-radius: var(--r-l);
  background: rgba(37,99,235,.07);
  color: inherit;
  text-decoration: none;
  transition: transform .2s var(--ease), box-shadow .2s var(--ease);
}
.arena-news-banner:hover { transform: translateY(-1px); box-shadow: var(--sh-card-lift); }
.arena-news-badge {
  flex-shrink: 0;
  padding: 4px 9px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  border-radius: var(--r-s);
  background: rgba(37,99,235,.14);
  color: #2563EB;
  border: 1px solid rgba(37,99,235,.28);
}
.arena-news-copy { flex: 1; text-align: left; font-size: 12.5px; line-height: 1.4; }
.arena-news-arrow { flex-shrink: 0; font-size: 22px; color: #2563EB; transition: transform .2s var(--ease); }
.arena-news-banner:hover .arena-news-arrow { transform: translateX(3px); }
html[data-theme="dark"] .arena-news-banner { border-color: rgba(122,183,255,.3); background: rgba(122,183,255,.08); }
html[data-theme="dark"] .arena-news-badge { color: var(--info); background: rgba(122,183,255,.16); border-color: rgba(122,183,255,.32); }
html[data-theme="dark"] .arena-news-arrow { color: var(--info); }

@media (max-width: 640px) {
  .arena-news-banner { padding: 10px 14px; }
}

/* Hero */
.hero {
  padding-top: var(--s9);
  padding-bottom: var(--s8);
  text-align: center;
}
.hero-eyebrow {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.2px;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: var(--s4);
}
.hero-title {
  font-size: clamp(40px, 5.6vw, 78px);
  font-weight: 700;
  line-height: 1.02;
  letter-spacing: -.035em;
  margin-bottom: var(--s6);
  color: var(--ink);
}
.hero-title .highlight {
  background: linear-gradient(to right, var(--amber-deep), var(--amber-deep-2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
html[data-theme="dark"] .hero-title .highlight {
  background: linear-gradient(to right, var(--amber-2), var(--amber-3));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Reveal */
.reveal { opacity: 0; transform: translateY(14px); transition: opacity .8s var(--ease-out), transform .8s var(--ease-out); }
.reveal.visible { opacity: 1; transform: none; }
.reveal.d1 { transition-delay: .05s; }
.reveal.d2 { transition-delay: .15s; }

/* Card Grid */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--s5);
  margin-top: var(--s8);
}
.experiment-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-l);
  padding: var(--s5);
  text-align: left;
  display: flex;
  flex-direction: column;
  transition: transform .25s var(--ease), box-shadow .25s var(--ease);
  position: relative;
  overflow: hidden;
}
.experiment-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--sh-card-lift);
}
.card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: var(--s3);
}
.card-title {
  font-size: 20px;
  font-weight: 600;
  line-height: 1.3;
  letter-spacing: -.01em;
  color: var(--ink);
}
.card-desc {
  font-size: 15px;
  color: var(--muted);
  flex-grow: 1;
  margin-bottom: var(--s5);
}
.card-action {
  font-size: 14px;
  font-weight: 600;
  color: var(--ink);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}
.card-action svg {
  width: 16px;
  height: 16px;
  transition: transform .25s var(--ease);
}
.experiment-card:hover .card-action svg { transform: translateX(4px); }
.experiment-card:hover .card-action { color: var(--amber); }

/* Chips */
.chip {
  padding: 5px 10px;
  font-size: 11px;
  font-weight: 600;
  border-radius: var(--r-s);
  border: 1px solid var(--border);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}
.chip.status-live {
  background: rgba(57,214,165,.12);
  color: var(--success);
  border-color: rgba(57,214,165,.25);
}
.chip.status-beta {
  background: rgba(245,161,0,.12);
  color: var(--amber);
  border-color: rgba(245,161,0,.25);
}
.chip.status-new {
  background: rgba(37,99,235,.12);
  color: #2563EB;
  border-color: rgba(37,99,235,.28);
}
html[data-theme="dark"] .chip.status-new {
  background: rgba(122,183,255,.16);
  color: var(--info);
  border-color: rgba(122,183,255,.32);
}
/* Groups the New + Live chips so the card header stays title | chips. */
.chip-group { display: flex; gap: var(--s2); align-items: center; flex-shrink: 0; }

/* ── Card body / footer ──────────────────────────────────────────────
   The card is no longer a single anchor, so the product link takes over the
   card's own column layout and the feedback controls sit outside it. */
.card-body {
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--s3);
  margin-top: var(--s4);
  padding-top: var(--s3);
  border-top: 1px solid var(--border);
}

/* ── Votes ── */
.vote-group { display: inline-flex; gap: var(--s1); }

.vote-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  font-family: inherit;
  font-size: 13px;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  color: var(--muted);
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--r-s);
  cursor: pointer;
  transition: color .18s var(--ease), background .18s var(--ease), border-color .18s var(--ease);
}
.vote-btn svg { width: 15px; height: 15px; }
.vote-btn:hover:not(:disabled) { color: var(--ink); border-color: var(--muted-2); }
.vote-btn:disabled { opacity: .5; cursor: not-allowed; }

/* aria-pressed carries the student's current vote, so the styling follows it
   rather than a separate class that could drift out of sync. */
.vote-btn[aria-pressed="true"][data-vote="up"] {
  color: var(--success);
  background: rgba(57,214,165,.12);
  border-color: rgba(57,214,165,.35);
}
.vote-btn[aria-pressed="true"][data-vote="down"] {
  color: var(--danger);
  background: rgba(192,57,43,.10);
  border-color: rgba(192,57,43,.30);
}

.feedback-btn {
  padding: 6px 10px;
  font-family: inherit;
  font-size: 13px;
  font-weight: 600;
  color: var(--muted);
  background: none;
  border: 1px solid var(--border);
  border-radius: var(--r-s);
  cursor: pointer;
  transition: color .18s var(--ease), border-color .18s var(--ease);
}
.feedback-btn:hover:not(:disabled) { color: var(--amber); border-color: var(--amber); }
.feedback-btn:disabled { opacity: .5; cursor: not-allowed; }

.card-error {
  margin-top: var(--s2);
  font-size: 12px;
  color: var(--danger);
}

.hub-feedback-bar {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--s3);
  margin-top: var(--s6);
  text-align: center;
}
.signin-note { font-size: 13px; color: var(--muted); max-width: 44ch; }
.feedback-btn-hub { padding: 9px 16px; font-size: 14px; }

/* ── Feedback dialog ── */
.feedback-dialog {
  width: min(520px, calc(100vw - 32px));
  /* The global `* { margin: 0 }` reset above outranks the UA's
     `dialog:modal { margin: auto }`, so centering has to be restored here. */
  margin: auto;
  padding: var(--s5);
  color: var(--ink);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-l);
  box-shadow: var(--sh-2);
}
.feedback-dialog::backdrop { background: rgba(0,0,0,.55); }
.feedback-title { font-size: 18px; font-weight: 600; letter-spacing: -.01em; }
.feedback-about { margin-top: var(--s1); font-size: 13px; color: var(--muted); }
.feedback-about strong { color: var(--ink); }

.feedback-textarea {
  width: 100%;
  margin-top: var(--s4);
  padding: var(--s3);
  font-family: inherit;
  font-size: 15px;
  line-height: 1.5;
  color: var(--ink);
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--r-m);
  resize: vertical;
}
.feedback-textarea:focus-visible { outline: 2px solid var(--amber); outline-offset: 1px; }

.feedback-meta { display: flex; justify-content: flex-end; margin-top: var(--s1); }
.feedback-counter { font-size: 12px; color: var(--muted); font-variant-numeric: tabular-nums; }
.feedback-counter.over { color: var(--danger); }
.feedback-consent { margin-top: var(--s3); font-size: 12px; line-height: 1.5; color: var(--muted); }
.feedback-error { margin-top: var(--s2); font-size: 13px; color: var(--danger); }

.feedback-actions { display: flex; justify-content: flex-end; gap: var(--s2); margin-top: var(--s4); }
.btn-ghost, .btn-primary {
  padding: 9px 16px;
  font-family: inherit;
  font-size: 14px;
  font-weight: 600;
  border-radius: var(--r-s);
  cursor: pointer;
  transition: opacity .18s var(--ease);
}
.btn-ghost { color: var(--muted); background: none; border: 1px solid var(--border); }
.btn-ghost:hover { color: var(--ink); }
.btn-primary { color: #0C0C0E; background: var(--amber); border: 1px solid var(--amber); }
.btn-primary:hover:not(:disabled) { background: var(--amber-2); }
.btn-primary:disabled { opacity: .5; cursor: not-allowed; }

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

/* Keyboard focus must stay visible on every new control. */
.vote-btn:focus-visible, .feedback-btn:focus-visible,
.btn-ghost:focus-visible, .btn-primary:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 2px;
}

@media (max-width: 480px) {
  .card-footer { flex-direction: column; align-items: stretch; }
  .vote-group { justify-content: space-between; }
  .vote-btn { flex: 1; justify-content: center; }
  .feedback-btn { width: 100%; }
}

.hub-toast {
  position: fixed;
  left: 50%;
  bottom: 24px;
  transform: translateX(-50%);
  z-index: 9998;
  max-width: calc(100vw - 32px);
  padding: 12px 18px;
  font-size: 14px;
  font-weight: 500;
  color: var(--ink);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-m);
  box-shadow: var(--sh-2);
  animation: toast-in .25s var(--ease-out);
}
@keyframes toast-in {
  from { opacity: 0; transform: translate(-50%, 8px); }
  to   { opacity: 1; transform: translate(-50%, 0); }
}
@media (prefers-reduced-motion: reduce) { .hub-toast { animation: none; } }