/* ==========================================================================
   Tokens
   Palette borrows from NZ road furniture: asphalt, kerb concrete, road-marking
   yellow, motorway-sign green and Stop-sign red.
   ========================================================================== */

:root {
  color-scheme: light;
  --font: "Overpass", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;

  --bg: #e9ecea;
  --surface: #ffffff;
  --surface-2: #f2f4f3;
  --surface-3: #e4e8e7;
  --ink: #1e2429;
  --ink-2: #4a545c;
  --ink-3: #5f6b73;
  --line: #d7dcdc;
  --line-strong: #b5bec2;
  --asphalt: #2b3237;

  --marking: #ffc72c;
  --go: #00754a;
  --go-bg: #e4f3eb;
  --go-line: #7cc4a0;
  --stop: #c41230;
  --stop-bg: #fbe9eb;
  --stop-line: #e9949f;
  --info: #1f5fae;

  --series: #2a78d6;
  --series-soft: rgba(42, 120, 214, 0.12);
  --track: #e3ebf5;
  --heat-0: #eef1f0;
  --heat-1: #b7d3f6;
  --heat-2: #6da7ec;
  --heat-3: #2a78d6;
  --heat-4: #184f95;

  --focus: #1f5fae;
  --shadow-card: 0 1px 2px rgba(30, 36, 41, 0.06), 0 12px 32px -12px rgba(30, 36, 41, 0.18);
  --shadow-pop: 0 18px 50px -12px rgba(15, 20, 25, 0.35);
  --scrim: rgba(18, 22, 26, 0.45);

  --r-card: 22px;
  --r-opt: 14px;
  --ease-out: cubic-bezier(0.2, 0.7, 0.2, 1);
  --page-max: 760px;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --bg: #101417;
    --surface: #192025;
    --surface-2: #20282e;
    --surface-3: #283139;
    --ink: #edf1f3;
    --ink-2: #b9c3c9;
    --ink-3: #8f9ba3;
    --line: #2b343b;
    --line-strong: #3d4952;
    --asphalt: #0c1013;
    --marking: #ffd24d;
    --go: #3cc985;
    --go-bg: rgba(60, 201, 133, 0.13);
    --go-line: rgba(60, 201, 133, 0.55);
    --stop: #ff6b6b;
    --stop-bg: rgba(255, 107, 107, 0.12);
    --stop-line: rgba(255, 107, 107, 0.55);
    --info: #6aa8f5;
    --series: #3987e5;
    --series-soft: rgba(57, 135, 229, 0.16);
    --track: #22303d;
    --heat-0: #222a31;
    --heat-1: #184f95;
    --heat-2: #256abf;
    --heat-3: #3987e5;
    --heat-4: #86b6ef;
    --focus: #6aa8f5;
    --shadow-card: 0 1px 0 rgba(255, 255, 255, 0.03) inset, 0 12px 32px -12px rgba(0, 0, 0, 0.6);
    --shadow-pop: 0 18px 50px -12px rgba(0, 0, 0, 0.7);
    --scrim: rgba(0, 0, 0, 0.6);
  }
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #101417;
  --surface: #192025;
  --surface-2: #20282e;
  --surface-3: #283139;
  --ink: #edf1f3;
  --ink-2: #b9c3c9;
  --ink-3: #8f9ba3;
  --line: #2b343b;
  --line-strong: #3d4952;
  --asphalt: #0c1013;
  --marking: #ffd24d;
  --go: #3cc985;
  --go-bg: rgba(60, 201, 133, 0.13);
  --go-line: rgba(60, 201, 133, 0.55);
  --stop: #ff6b6b;
  --stop-bg: rgba(255, 107, 107, 0.12);
  --stop-line: rgba(255, 107, 107, 0.55);
  --info: #6aa8f5;
  --series: #3987e5;
  --series-soft: rgba(57, 135, 229, 0.16);
  --track: #22303d;
  --heat-0: #222a31;
  --heat-1: #184f95;
  --heat-2: #256abf;
  --heat-3: #3987e5;
  --heat-4: #86b6ef;
  --focus: #6aa8f5;
  --shadow-card: 0 1px 0 rgba(255, 255, 255, 0.03) inset, 0 12px 32px -12px rgba(0, 0, 0, 0.6);
  --shadow-pop: 0 18px 50px -12px rgba(0, 0, 0, 0.7);
  --scrim: rgba(0, 0, 0, 0.6);
}

/* ==========================================================================
   Base
   ========================================================================== */

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  -webkit-tap-highlight-color: transparent;
}

body {
  margin: 0;
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font);
  font-size: 1rem;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1,
h2,
h3,
p {
  margin: 0;
}

[hidden] {
  display: none !important;
}

button {
  font: inherit;
  color: inherit;
  touch-action: manipulation;
}

a {
  color: var(--info);
  text-underline-offset: 0.18em;
}

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

.ico {
  width: 1.25em;
  height: 1.25em;
  flex: none;
  fill: currentColor;
}

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

.skip-link {
  position: absolute;
  left: 12px;
  top: -60px;
  z-index: 50;
  padding: 10px 14px;
  border-radius: 10px;
  background: var(--ink);
  color: var(--surface);
  font-weight: 700;
  text-decoration: none;
}

.skip-link:focus {
  top: 12px;
}

/* ==========================================================================
   Buttons
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 48px;
  padding: 0.7rem 1.25rem 0.6rem;
  border: 0;
  border-radius: 999px;
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.2;
  cursor: pointer;
  transition: background-color 0.15s, color 0.15s, transform 0.12s, box-shadow 0.15s;
}

.btn:active {
  transform: scale(0.97);
}

.btn-primary {
  background: var(--ink);
  color: var(--surface);
}

.btn-primary:hover {
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--ink) 16%, transparent);
}

.btn-quiet {
  background: transparent;
  color: var(--ink);
  box-shadow: inset 0 0 0 1.5px var(--line-strong);
}

.btn-quiet:hover {
  box-shadow: inset 0 0 0 1.5px var(--ink);
}

.btn-danger {
  background: var(--stop);
  color: #fff;
}

:root[data-theme="dark"] .btn-danger {
  color: #101417;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .btn-danger {
    color: #101417;
  }
}

.icon-btn {
  display: inline-grid;
  place-items: center;
  width: 44px;
  height: 44px;
  flex: none;
  padding: 0;
  border: 0;
  border-radius: 999px;
  background: transparent;
  color: var(--ink);
  cursor: pointer;
  transition: background-color 0.15s;
}

.icon-btn:hover {
  background: var(--surface-3);
}

.icon-btn .ico {
  width: 22px;
  height: 22px;
}

/* ==========================================================================
   Top bar + stats chip
   ========================================================================== */

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  padding-top: env(safe-area-inset-top);
  background: color-mix(in srgb, var(--bg) 86%, transparent);
  -webkit-backdrop-filter: saturate(1.4) blur(14px);
  backdrop-filter: saturate(1.4) blur(14px);
  transition: box-shadow 0.2s;
}

.topbar.is-scrolled {
  box-shadow: 0 1px 0 var(--line);
}

.topbar-inner {
  display: flex;
  align-items: center;
  gap: 8px;
  max-width: var(--page-max);
  margin: 0 auto;
  padding: 10px max(16px, env(safe-area-inset-right)) 10px max(16px, env(safe-area-inset-left));
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-right: auto;
  color: var(--ink);
  text-decoration: none;
  font-weight: 800;
  font-size: 1.0625rem;
  letter-spacing: -0.01em;
  white-space: nowrap;
}

.brand-mark {
  width: 34px;
  height: 34px;
}

/* On phones the logo stands alone so the stats chip always fits. */
.brand-name {
  display: none;
}

@media (min-width: 480px) {
  .brand-name {
    display: inline;
  }
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 4px;
}

.stats-chip {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: 48px;
  padding: 4px 14px 4px 5px;
  border: 0;
  border-radius: 999px;
  background: var(--surface);
  box-shadow: 0 0 0 1px var(--line), 0 1px 2px rgba(0, 0, 0, 0.04);
  color: var(--ink);
  cursor: pointer;
  font-variant-numeric: tabular-nums;
  transition: box-shadow 0.15s, transform 0.12s;
}

.stats-chip:hover {
  box-shadow: 0 0 0 1.5px var(--ink-3), 0 2px 8px rgba(0, 0, 0, 0.06);
}

.stats-chip:active {
  transform: scale(0.97);
}

.roundel {
  position: relative;
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
}

.roundel svg {
  position: absolute;
  inset: 0;
  transform: rotate(-90deg);
}

.roundel circle {
  fill: none;
  stroke-width: 4;
}

.roundel-track {
  stroke: var(--surface-3);
}

.roundel-arc {
  stroke: var(--go);
  stroke-linecap: round;
  stroke-dasharray: 0 100;
  opacity: 0;
  transition: stroke-dasharray 0.7s var(--ease-out), opacity 0.2s;
}

.roundel-value {
  position: relative;
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1;
  padding-top: 2px;
}

.roundel-value small {
  font-size: 0.7em;
  font-weight: 700;
}

.chip-score,
.chip-streak,
.chip-open {
  display: inline-flex;
  align-items: center;
  gap: 3px;
  font-size: 0.9375rem;
  font-weight: 600;
  line-height: 1;
  padding-top: 2px;
  white-space: nowrap;
}

.stats-chip .num {
  display: inline-block;
  font-weight: 800;
}

.chip-of {
  color: var(--ink-3);
}

.chip-streak .ico {
  width: 18px;
  height: 18px;
  margin-top: -3px;
  color: var(--ink-3);
  transition: color 0.3s;
}

.chip-streak.is-hot .ico {
  color: #f0a500;
}

.chip-open {
  color: var(--ink-2);
}

.chip-open .ico {
  width: 18px;
  height: 18px;
  margin-top: -3px;
}

.wide {
  display: none;
}

.bump {
  animation: bump 0.45s var(--ease-out);
}

@keyframes bump {
  0% { transform: translateY(0) scale(1); }
  35% { transform: translateY(-3px) scale(1.18); }
  100% { transform: translateY(0) scale(1); }
}

@media (min-width: 640px) {
  .wide {
    display: inline;
  }

  .narrow {
    display: none;
  }

  .chip-open .wide {
    margin-left: 3px;
  }

  .stats-chip {
    gap: 14px;
    padding-right: 16px;
  }
}

@media (max-width: 359px) {
  .stats-chip {
    gap: 7px;
    padding-right: 10px;
  }
}

/* ==========================================================================
   Question card
   ========================================================================== */

.stage {
  flex: 1;
  width: 100%;
  max-width: var(--page-max);
  margin: 0 auto;
  padding: 6px max(12px, env(safe-area-inset-right)) 24px max(12px, env(safe-area-inset-left));
}

.q-card {
  position: relative;
  padding: 14px 14px 16px;
  border-radius: var(--r-card);
  background: var(--surface);
  box-shadow: var(--shadow-card);
  outline: none;
}

.q-head {
  display: grid;
  gap: 14px;
}

.q-figure {
  position: relative;
  display: grid;
  place-items: center;
  height: 212px;
  margin: 0;
  overflow: hidden;
  border-radius: 16px;
  background: var(--asphalt);
  isolation: isolate;
}

/* A blurred copy of the picture fills the frame around the small 200px original. */
.q-figure::before {
  content: "";
  position: absolute;
  inset: -24px;
  z-index: -1;
  background-image: var(--q-img, none);
  background-size: cover;
  background-position: center;
  filter: blur(22px) saturate(1.15) brightness(0.8);
  opacity: 0.85;
}

.q-figure img {
  display: block;
  width: 196px;
  height: 196px;
  object-fit: contain;
  border-radius: 10px;
  background: #fff;
  box-shadow: 0 10px 28px -8px rgba(0, 0, 0, 0.55);
}

.q-figure.is-missing img {
  visibility: hidden;
}

.q-body {
  display: grid;
  align-content: start;
  gap: 8px;
  padding: 0 4px;
}

.q-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 10px;
  min-height: 1.5rem;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--ink-2);
}

.q-topic {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.q-topic::before {
  content: "";
  width: 9px;
  height: 9px;
  border-radius: 2px;
  background: var(--marking);
  box-shadow: 0 0 0 1.5px var(--ink);
  transform: rotate(45deg);
}

.q-flag {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 3px 9px 2px 7px;
  border-radius: 999px;
  background: var(--stop-bg);
  color: var(--stop);
}

.q-flag .ico {
  width: 14px;
  height: 14px;
  margin-top: -2px;
}

.q-text {
  font-size: clamp(1.25rem, 1.08rem + 0.75vw, 1.625rem);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.012em;
  text-wrap: pretty;
}

/* Options --------------------------------------------------------------- */

.q-options {
  display: grid;
  gap: 10px;
  margin-top: 18px;
}

.q-options.is-short {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.opt {
  position: relative;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 12px;
  width: 100%;
  min-height: 58px;
  padding: 9px 14px 9px 9px;
  border: 1.5px solid var(--line-strong);
  border-radius: var(--r-opt);
  background: var(--surface);
  color: var(--ink);
  text-align: left;
  font-size: 1.0625rem;
  font-weight: 500;
  line-height: 1.35;
  cursor: pointer;
  transition: border-color 0.15s, background-color 0.25s, opacity 0.3s, transform 0.12s, box-shadow 0.15s;
  animation: opt-in 0.4s var(--ease-out) both;
  animation-delay: calc(var(--i, 0) * 45ms + 60ms);
}

@keyframes opt-in {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
}

.opt:hover:not([aria-disabled="true"]) {
  border-color: var(--ink);
  box-shadow: 0 2px 10px -4px rgba(0, 0, 0, 0.2);
}

.opt:active:not([aria-disabled="true"]) {
  transform: scale(0.985);
}

.opt[aria-disabled="true"] {
  cursor: default;
}

.opt-key {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  padding-top: 2px;
  border-radius: 10px;
  background: var(--surface-2);
  box-shadow: inset 0 0 0 1.5px var(--line);
  font-size: 1rem;
  font-weight: 800;
  transition: background-color 0.25s, color 0.25s, box-shadow 0.25s;
}

.opt-text {
  padding-top: 2px;
}

.opt-mark {
  display: grid;
  place-items: center;
  width: 28px;
  height: 28px;
  border-radius: 999px;
  color: #fff;
  transform: scale(0);
}

.opt-mark .ico {
  width: 18px;
  height: 18px;
}

.opt.is-correct,
.opt.is-answer {
  border-color: var(--go);
  background: var(--go-bg);
}

.opt.is-correct .opt-key,
.opt.is-answer .opt-key {
  background: var(--go);
  color: var(--surface);
  box-shadow: none;
}

.opt.is-correct .opt-mark,
.opt.is-answer .opt-mark {
  background: var(--go);
  color: var(--surface);
  animation: mark-pop 0.45s var(--ease-out) forwards;
}

.opt.is-correct {
  animation: picked 0.45s var(--ease-out);
}

.opt.is-wrong {
  border-color: var(--stop);
  background: var(--stop-bg);
  animation: shake 0.42s ease-in-out;
}

.opt.is-wrong .opt-key {
  background: var(--stop);
  color: var(--surface);
  box-shadow: none;
}

.opt.is-wrong .opt-mark {
  background: var(--stop);
  color: var(--surface);
  animation: mark-pop 0.45s var(--ease-out) forwards;
}

.opt.is-dim {
  opacity: 0.45;
}

@keyframes mark-pop {
  0% { transform: scale(0); }
  60% { transform: scale(1.18); }
  100% { transform: scale(1); }
}

@keyframes picked {
  0% { transform: scale(1); }
  40% { transform: scale(1.02); }
  100% { transform: scale(1); }
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-7px); }
  40% { transform: translateX(6px); }
  60% { transform: translateX(-4px); }
  80% { transform: translateX(2px); }
}

/* Feedback panel -------------------------------------------------------- */

.feedback {
  margin-top: 16px;
  padding: 16px;
  border-radius: 18px;
  background: var(--go-bg);
  box-shadow: inset 0 0 0 1px var(--go-line);
  scroll-margin-bottom: 16px;
  animation: fb-in 0.38s var(--ease-out);
}

.feedback.is-wrong {
  background: var(--stop-bg);
  box-shadow: inset 0 0 0 1px var(--stop-line);
}

@keyframes fb-in {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
}

.fb-head {
  display: flex;
  align-items: center;
  gap: 12px;
}

.fb-badge {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  flex: none;
  border-radius: 999px;
  background: var(--go);
  color: var(--surface);
}

.feedback.is-wrong .fb-badge {
  background: var(--stop);
}

.fb-badge .ico {
  width: 22px;
  height: 22px;
}

.fb-title {
  font-size: 1.25rem;
  font-weight: 800;
  line-height: 1.2;
  padding-top: 2px;
  color: var(--go);
}

.feedback.is-wrong .fb-title {
  color: var(--stop);
}

.fb-sub {
  color: var(--ink-2);
  font-size: 0.9375rem;
  font-weight: 600;
}

.fb-sub:empty {
  display: none;
}

.fb-explain {
  display: grid;
  gap: 10px;
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px solid color-mix(in srgb, var(--ink) 12%, transparent);
}

.fb-explain[hidden] {
  display: none;
}

.fb-answer {
  font-weight: 700;
}

.fb-answer:empty {
  display: none;
}

.fb-text {
  color: var(--ink);
  font-size: 1rem;
  line-height: 1.55;
  max-width: 62ch;
}

.fb-ref {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  color: var(--ink-2);
  font-size: 0.875rem;
  font-weight: 600;
}

.fb-ref .ico {
  width: 18px;
  height: 18px;
  margin-top: -2px;
}

.fb-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 10px;
  margin-top: 16px;
}

.fb-actions .btn-primary {
  flex: 1 1 auto;
}

@media (min-width: 520px) {
  .fb-actions .btn-primary {
    flex: 0 0 auto;
    min-width: 180px;
  }
}

/* The lane line: road-marking dashes that a fill drives across while the next
   question counts down. */
.lane {
  position: relative;
  height: 10px;
  margin-top: 16px;
  overflow: hidden;
  border-radius: 999px;
  background-color: var(--asphalt);
  background-image: repeating-linear-gradient(90deg, var(--marking) 0 16px, transparent 16px 30px);
  background-size: 30px 2px;
  background-repeat: repeat-x;
  background-position: 0 50%;
  animation: lane-roll 0.6s linear infinite;
}

.lane[hidden] {
  display: none;
}

.lane-fill {
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: var(--go);
  transform: scaleX(0);
  transform-origin: left center;
}

@keyframes lane-roll {
  to {
    background-position: -30px 50%;
  }
}

/* Loading + error ------------------------------------------------------- */

.q-card.is-loading .q-figure,
.q-card.is-loading .q-topic,
.q-card.is-loading .q-text,
.q-card.is-loading .q-options::before,
.q-card.is-loading .q-options::after {
  background: var(--surface-2);
  color: transparent;
  animation: pulse 1.4s ease-in-out infinite;
}

.q-card.is-loading .q-figure img,
.q-card.is-loading .q-topic::before {
  visibility: hidden;
}

.q-card.is-loading .q-topic {
  width: 110px;
  height: 14px;
  border-radius: 6px;
}

.q-card.is-loading .q-text {
  height: 3.6em;
  border-radius: 8px;
}

.q-card.is-loading .q-options::before,
.q-card.is-loading .q-options::after {
  content: "";
  height: 58px;
  border-radius: var(--r-opt);
}

@keyframes pulse {
  50% {
    opacity: 0.55;
  }
}

.q-error {
  display: grid;
  justify-items: start;
  gap: 12px;
  padding: 12px 6px 4px;
  color: var(--ink-2);
}

.q-error .q-text {
  color: var(--ink);
}

.q-card.has-error > :not(.q-error) {
  display: none;
}

/* Wider screens: picture beside the question, options in two columns. ---- */

@media (min-width: 720px) {
  .stage {
    padding-top: 18px;
  }

  .q-card {
    padding: 20px;
  }

  .q-head {
    grid-template-columns: 232px 1fr;
    gap: 22px;
    align-items: start;
  }

  .q-figure {
    height: 232px;
  }

  .q-body {
    padding: 6px 0 0;
    gap: 12px;
  }

  .q-options {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    margin-top: 22px;
  }

  .feedback {
    padding: 18px 20px;
  }
}

@media (max-height: 700px) and (max-width: 719px) {
  .q-figure {
    height: 184px;
  }

  .q-figure img {
    width: 170px;
    height: 170px;
  }
}

/* ==========================================================================
   Footer + toast
   ========================================================================== */

.site-footer {
  max-width: var(--page-max);
  width: 100%;
  margin: 0 auto;
  padding: 0 20px calc(20px + env(safe-area-inset-bottom));
  color: var(--ink-3);
  font-size: 0.8125rem;
  text-align: center;
}

.toast {
  position: fixed;
  left: 50%;
  top: calc(72px + env(safe-area-inset-top));
  z-index: 30;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px 8px 12px;
  border-radius: 999px;
  background: var(--ink);
  color: var(--surface);
  font-weight: 700;
  box-shadow: var(--shadow-pop);
  opacity: 0;
  pointer-events: none;
  transform: translate(-50%, -12px) scale(0.96);
  transition: opacity 0.25s, transform 0.35s var(--ease-out);
}

.toast.is-shown {
  opacity: 1;
  transform: translate(-50%, 0) scale(1);
}

.toast .ico {
  width: 20px;
  height: 20px;
  margin-top: -3px;
  color: var(--marking);
}

/* ==========================================================================
   Stats sheet (dialog)
   ========================================================================== */

.sheet {
  width: 100%;
  max-width: 100%;
  height: 100%;
  max-height: 100%;
  margin: 0;
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--ink);
  overflow: hidden;
}

.sheet::backdrop {
  background: var(--scrim);
  opacity: 0;
  transition: opacity 0.3s;
}

.sheet.is-open::backdrop {
  opacity: 1;
}

.sheet-panel {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  background: var(--bg);
  transform: translateY(100%);
  transition: transform 0.38s var(--ease-out);
}

.sheet.is-open .sheet-panel {
  transform: none;
}

.sheet-head {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 10px 8px;
  padding: calc(12px + env(safe-area-inset-top)) 12px 12px 20px;
  border-bottom: 1px solid var(--line);
  background: var(--bg);
}

.sheet-title {
  font-size: 1.375rem;
  font-weight: 800;
  letter-spacing: -0.01em;
  padding-top: 3px;
}

.seg {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  padding: 4px;
  margin-right: 8px;
  border-radius: 999px;
  background: var(--surface-3);
}

.seg-btn {
  min-height: 40px;
  padding: 6px 12px 4px;
  border: 0;
  border-radius: 999px;
  background: transparent;
  color: var(--ink-2);
  font-weight: 700;
  cursor: pointer;
  transition: background-color 0.2s, color 0.2s, box-shadow 0.2s;
}

.seg-btn[aria-selected="true"] {
  background: var(--seg-on, var(--surface));
  color: var(--ink);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.12);
}

:root[data-theme="dark"] .seg {
  --seg-on: #3b4752;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .seg {
    --seg-on: #3b4752;
  }
}

.sheet-body {
  flex: 1;
  overflow-y: auto;
  overscroll-behavior: contain;
  padding: 16px 16px calc(28px + env(safe-area-inset-bottom));
  outline: none;
}

@media (min-width: 720px) {
  .sheet {
    display: grid;
    place-items: center;
    padding: 24px;
  }

  .sheet:not([open]) {
    display: none;
  }

  .sheet-panel {
    position: relative;
    inset: auto;
    width: min(920px, 100%);
    height: min(900px, 100%);
    border-radius: 26px;
    box-shadow: var(--shadow-pop);
    overflow: hidden;
    opacity: 0;
    transform: translateY(16px) scale(0.98);
    transition: transform 0.32s var(--ease-out), opacity 0.22s;
  }

  .sheet.is-open .sheet-panel {
    opacity: 1;
  }

  .sheet-head {
    grid-template-columns: auto 1fr auto;
    padding: 16px 16px 16px 28px;
  }

  .sheet-head .icon-btn {
    grid-column: 3;
    grid-row: 1;
  }

  .seg {
    grid-column: 2;
    grid-row: 1;
    justify-self: center;
    width: 320px;
    margin: 0;
  }

  .sheet-body {
    padding: 24px 28px 36px;
  }
}

/* Dashboard layout ------------------------------------------------------- */

.dash {
  display: grid;
  gap: 16px;
  animation: dash-in 0.3s var(--ease-out);
}

@keyframes dash-in {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
}

.panel {
  min-width: 0;
  padding: 18px;
  border-radius: 20px;
  background: var(--surface);
  box-shadow: 0 0 0 1px var(--line);
}

.panel-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
}

.panel-title {
  font-size: 1.0625rem;
  font-weight: 800;
  line-height: 1.3;
}

.panel-note {
  color: var(--ink-3);
  font-size: 0.8125rem;
  font-weight: 600;
  text-align: right;
}

.panel-caption {
  margin-top: 12px;
  color: var(--ink-2);
  font-size: 0.875rem;
}

.dash-grid-2 {
  display: grid;
  gap: 16px;
}

@media (min-width: 760px) {
  .dash-grid-2 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* Hero */

.hero {
  display: grid;
  gap: 16px;
  padding: 22px 20px 20px;
}

.hero-top {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 16px;
}

.hero-label {
  color: var(--ink-2);
  font-weight: 700;
  font-size: 0.9375rem;
}

.hero-figure {
  font-size: clamp(3rem, 2.4rem + 3vw, 4.25rem);
  font-weight: 800;
  line-height: 0.95;
  letter-spacing: -0.035em;
  padding-top: 6px;
}

.hero-figure small {
  font-size: 0.42em;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--ink-3);
  margin-left: 6px;
}

.hero-figure small.is-unit {
  margin-left: 1px;
}

.hero-sub {
  margin-top: 6px;
  color: var(--ink-2);
  font-size: 0.9375rem;
}

.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 12px 5px 9px;
  border-radius: 999px;
  font-size: 0.875rem;
  font-weight: 700;
  white-space: nowrap;
}

.status-pill .ico {
  width: 18px;
  height: 18px;
  margin-top: -3px;
}

.status-pill.is-good {
  background: var(--go-bg);
  color: var(--go);
}

.status-pill.is-bad {
  background: var(--stop-bg);
  color: var(--stop);
}

.status-pill.is-neutral {
  background: var(--surface-2);
  color: var(--ink-2);
}

/* Meter: 0–35 with the pass mark */

.meter {
  position: relative;
  padding-top: 4px;
}

.meter.has-mark {
  padding-top: 22px;
}

.meter-track {
  position: relative;
  height: 14px;
  border-radius: 999px;
  background: var(--track);
  overflow: hidden;
}

.meter-fill {
  height: 100%;
  border-radius: 999px;
  background: var(--series);
  transform-origin: left;
  animation: grow 0.8s var(--ease-out) both;
}

.meter-fill.is-good {
  background: var(--go);
}

@keyframes grow {
  from {
    transform: scaleX(0);
  }
}

/* The pass mark: a line through the track, labelled above and to its left. */
.meter-mark {
  position: absolute;
  top: 2px;
  height: 40px;
  width: 0;
  border-left: 2px solid var(--ink);
}

.meter-mark span {
  position: absolute;
  top: 0;
  right: 6px;
  color: var(--ink-2);
  font-size: 0.75rem;
  font-weight: 700;
  line-height: 1.2;
  white-space: nowrap;
}

.meter-scale {
  display: flex;
  justify-content: space-between;
  margin-top: 6px;
  color: var(--ink-3);
  font-size: 0.75rem;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

/* KPI tiles: one instrument cluster with hairline dividers */

.kpis {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-radius: 20px;
  background: var(--surface);
  box-shadow: 0 0 0 1px var(--line);
  overflow: hidden;
}

.kpi {
  padding: 16px 16px 14px;
  box-shadow: 1px 0 0 var(--line), 0 1px 0 var(--line);
}

.kpi-label {
  color: var(--ink-2);
  font-size: 0.8125rem;
  font-weight: 600;
}

.kpi-value {
  margin-top: 4px;
  font-size: 1.75rem;
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.kpi-value small {
  font-size: 0.55em;
  font-weight: 700;
  color: var(--ink-3);
  margin-left: 2px;
  letter-spacing: 0;
}

.kpi-note {
  margin-top: 2px;
  color: var(--ink-3);
  font-size: 0.8125rem;
}

@media (min-width: 560px) {
  .kpis {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* Charts */

.viz {
  position: relative;
  width: 100%;
}

.viz svg {
  display: block;
  overflow: visible;
}

.viz text {
  fill: var(--ink-3);
  font-family: var(--font);
  font-size: 11px;
  font-weight: 600;
}

.viz .t-strong {
  fill: var(--ink);
  font-weight: 800;
  font-size: 12px;
}

.viz .grid {
  stroke: var(--line);
  stroke-width: 1;
  shape-rendering: crispEdges;
}

.viz .axis {
  stroke: var(--line-strong);
  stroke-width: 1;
  shape-rendering: crispEdges;
}

.viz .ref {
  stroke: var(--ink-2);
  stroke-width: 1.5;
  stroke-dasharray: 4 4;
}

.viz .line {
  fill: none;
  stroke: var(--series);
  stroke-width: 2;
  stroke-linejoin: round;
  stroke-linecap: round;
}

.viz .area {
  fill: var(--series-soft);
}

.viz .dot {
  fill: var(--series);
  stroke: var(--surface);
  stroke-width: 2;
}

.viz .bar {
  fill: var(--series);
  transition: opacity 0.15s;
}

.viz .bar.is-good {
  fill: var(--go);
}

.viz .bar.is-bad {
  fill: var(--stop);
}

.viz .hit {
  fill: transparent;
  cursor: default;
  outline: none;
}

.viz .hit:focus-visible {
  fill: color-mix(in srgb, var(--focus) 14%, transparent);
  stroke: var(--focus);
  stroke-width: 2;
}

.viz.is-hovering .bar:not(.is-active) {
  opacity: 0.55;
}

.viz .cross {
  stroke: var(--ink-3);
  stroke-width: 1;
  shape-rendering: crispEdges;
}

.viz .cell {
  transition: opacity 0.15s;
}

.viz .cell.is-active {
  stroke: var(--ink);
  stroke-width: 2;
}

.viz-tip {
  position: absolute;
  z-index: 5;
  max-width: 260px;
  padding: 9px 12px 8px;
  border-radius: 12px;
  background: var(--ink);
  color: var(--surface);
  font-size: 0.8125rem;
  line-height: 1.4;
  box-shadow: var(--shadow-pop);
  pointer-events: none;
}

.viz-tip b {
  display: block;
  font-size: 1rem;
  font-weight: 800;
}

.viz-tip .tip-label {
  opacity: 0.8;
}

.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 16px;
  margin-top: 10px;
  color: var(--ink-2);
  font-size: 0.8125rem;
  font-weight: 600;
}

.legend-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.swatch {
  width: 12px;
  height: 12px;
  border-radius: 3px;
  margin-top: -2px;
}

.swatch.is-good {
  background: var(--go);
}

.swatch.is-bad {
  background: var(--stop);
}

.swatch.is-line {
  height: 0;
  border-radius: 0;
  border-top: 2px dashed var(--ink-2);
  width: 16px;
  margin-top: 0;
}

.heat-scale {
  display: inline-flex;
  align-items: center;
  gap: 3px;
}

.heat-scale i {
  width: 12px;
  height: 12px;
  border-radius: 3px;
}

/* Topic bars */

.bars {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.bar-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 6px 12px;
  align-items: baseline;
}

.bar-name {
  font-weight: 700;
  font-size: 0.9375rem;
}

.bar-value {
  font-size: 0.9375rem;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
  text-align: right;
}

.bar-value small {
  margin-left: 6px;
  color: var(--ink-3);
  font-weight: 600;
  font-size: 0.8125rem;
}

.bar-track {
  grid-column: 1 / -1;
  position: relative;
  height: 10px;
  border-radius: 999px;
  background: var(--track);
}

.bar-fill {
  display: block;
  height: 100%;
  border-radius: 999px;
  background: var(--series);
  transform-origin: left;
  animation: grow 0.7s var(--ease-out) both;
  animation-delay: calc(var(--i, 0) * 40ms);
}

.bar-pass {
  position: absolute;
  top: -3px;
  bottom: -3px;
  left: 91.43%;
  border-left: 2px solid var(--ink-2);
}

/* Lists: sessions + missed questions */

.table-wrap {
  overflow-x: auto;
  margin: 0 -4px;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
  font-variant-numeric: tabular-nums;
}

.data-table th,
.data-table td {
  padding: 9px 4px 7px;
  border-bottom: 1px solid var(--line);
  text-align: right;
  white-space: nowrap;
}

.data-table th:first-child,
.data-table td:first-child {
  text-align: left;
}

.data-table th {
  color: var(--ink-3);
  font-size: 0.75rem;
  font-weight: 700;
}

.data-table tr.is-current td {
  font-weight: 800;
}

.data-table .mini {
  display: inline-block;
  width: 44px;
  height: 6px;
  margin-left: 8px;
  vertical-align: 2px;
  border-radius: 999px;
  background: var(--track);
  overflow: hidden;
}

.data-table .mini i {
  display: block;
  height: 100%;
  background: var(--series);
}

@media (max-width: 479px) {
  .data-table .mini {
    display: none;
  }
}

.link-btn {
  margin-top: 10px;
  padding: 6px 0;
  border: 0;
  background: none;
  color: var(--info);
  font-weight: 700;
  cursor: pointer;
}

.viz-table {
  margin-top: 10px;
  font-size: 0.875rem;
}

.viz-table summary {
  display: inline-block;
  padding: 4px 0;
  color: var(--info);
  font-weight: 700;
  cursor: pointer;
  list-style: none;
}

.viz-table summary::-webkit-details-marker {
  display: none;
}

.viz-table[open] summary {
  margin-bottom: 6px;
}

.viz-table .table-wrap {
  max-height: 260px;
  overflow: auto;
}

.missed {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.missed-item {
  border-radius: 14px;
  background: var(--surface-2);
}

.missed-item summary {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: start;
  gap: 12px;
  padding: 12px;
  border-radius: 14px;
  cursor: pointer;
  list-style: none;
}

.missed-item summary::-webkit-details-marker {
  display: none;
}

.missed-thumb {
  display: block;
  width: 56px;
  height: 56px;
  border-radius: 10px;
  background: #fff;
  object-fit: cover;
  transition: width 0.25s var(--ease-out), height 0.25s var(--ease-out);
}

.missed-item[open] .missed-thumb {
  width: 120px;
  height: 120px;
}

.missed-main {
  display: grid;
  gap: 6px;
  min-width: 0;
  padding-top: 2px;
}

.missed-q {
  font-weight: 700;
  line-height: 1.35;
}

.missed-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px 10px;
  color: var(--ink-3);
  font-size: 0.8125rem;
  font-weight: 600;
}

.missed-count {
  padding: 3px 8px 1px;
  border-radius: 999px;
  background: var(--stop-bg);
  color: var(--stop);
  font-weight: 800;
  white-space: nowrap;
}

.missed-body {
  display: grid;
  gap: 8px;
  padding: 2px 14px 16px;
  font-size: 0.9375rem;
}

.missed-body .ans {
  display: flex;
  gap: 8px;
  align-items: flex-start;
}

.missed-body .ans .ico {
  width: 18px;
  height: 18px;
  flex: none;
  margin-top: 1px;
}

.missed-body .ans.is-good .ico {
  color: var(--go);
}

.missed-body .ans.is-bad .ico {
  color: var(--stop);
}

.missed-body .why {
  color: var(--ink-2);
}

/* Empty state + data controls */

.empty {
  display: grid;
  justify-items: center;
  gap: 10px;
  padding: 40px 20px;
  text-align: center;
  color: var(--ink-2);
}

.empty .brand-mark {
  width: 56px;
  height: 56px;
}

.empty h3 {
  color: var(--ink);
  font-size: 1.25rem;
  font-weight: 800;
}

.data-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 14px;
}

.data-actions .btn {
  min-height: 44px;
  font-size: 0.9375rem;
}

.data-actions .btn-quiet.is-danger {
  color: var(--stop);
}

.confirm {
  width: min(420px, calc(100% - 32px));
  padding: 22px;
  border: 0;
  border-radius: 22px;
  background: var(--surface);
  color: var(--ink);
  box-shadow: var(--shadow-pop);
}

.confirm::backdrop {
  background: var(--scrim);
}

.confirm h2 {
  font-size: 1.25rem;
  font-weight: 800;
}

.confirm p {
  margin-top: 8px;
  color: var(--ink-2);
}

.confirm-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 10px;
  margin-top: 20px;
}

/* ==========================================================================
   Reduced motion
   ========================================================================== */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    animation-delay: 0ms !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  .sheet-panel,
  .sheet.is-open .sheet-panel {
    transform: none;
  }
}