/* Jost* by indestructible type*, SIL OFL 1.1 — see fonts/Jost-LICENSE.md. */
@font-face {
  font-family: Jost;
  font-style: normal;
  font-weight: 100 900;
  src: url("./fonts/jost-variable.woff2") format("woff2");
  font-display: swap;
}

:root {
  color-scheme: dark;
  font-family:
    Jost, Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
  --background: #161615;
  --surface: #242320;
  --surface-raised: #302e2a;
  --text: #f7f3ea;
  --muted: #b8b0a3;
  --accent: #d4a852;
  --accent-strong: #f3cb78;
  --correct: #55d68a;
  --incorrect: #ff6b6b;
}

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

html {
  min-width: 320px;
  background: var(--background);
}

body {
  min-height: 100vh;
  margin: 0;
  background:
    radial-gradient(circle at top, rgb(212 168 82 / 10%), transparent 34rem),
    var(--background);
  color: var(--text);
}

a {
  color: inherit;
}

button {
  font: inherit;
}

.site-header {
  position: sticky;
  z-index: 20;
  top: 0;
  border-bottom: 1px solid rgb(255 255 255 / 8%);
  background: rgb(22 22 21 / 88%);
  backdrop-filter: blur(14px);
}

.site-header__inner,
.site-footer {
  width: min(1120px, calc(100% - 2rem));
  margin-inline: auto;
}

.site-header__inner {
  display: flex;
  min-height: 4rem;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  color: var(--accent-strong);
  font-size: 1.15rem;
  font-weight: 800;
  letter-spacing: 0.02em;
  text-decoration: none;
}

.site-footer a {
  color: var(--muted);
  text-underline-offset: 0.2em;
}

.eyebrow {
  margin: 0 0 0.75rem;
  color: var(--accent-strong);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.practice-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 280px), 1fr));
  gap: 1rem;
}

.loading-message {
  grid-column: 1 / -1;
  margin: 0;
  padding: 1.25rem;
  border: 1px solid rgb(255 255 255 / 8%);
  border-radius: 1rem;
  background: var(--surface);
  color: var(--muted);
  line-height: 1.6;
}

.loading-message--error,
.load-error .intro-card p:first-of-type {
  color: #ffc1c1;
}

.practice-card {
  display: flex;
  min-height: 220px;
  flex-direction: column;
  padding: 1.5rem;
  border: 1px solid rgb(255 255 255 / 8%);
  border-radius: 1.25rem;
  background: linear-gradient(145deg, var(--surface-raised), var(--surface));
  box-shadow: 0 20px 50px rgb(0 0 0 / 16%);
  text-decoration: none;
  transition:
    border-color 160ms ease,
    transform 160ms ease;
}

.practice-card:hover {
  border-color: rgb(212 168 82 / 55%);
  transform: translateY(-3px);
}

.practice-card:focus-visible,
.control-button:focus-visible,
.back-link:focus-visible {
  outline: 3px solid var(--accent-strong);
  outline-offset: 3px;
}

.practice-card h2 {
  margin: 1rem 0 0.65rem;
  font-size: 1.4rem;
}

.practice-card p {
  margin: 0;
  color: var(--muted);
  line-height: 1.55;
}

.practice-card__action {
  margin-top: auto;
  padding-top: 1.25rem;
  color: var(--accent-strong);
  font-weight: 750;
}

.site-footer {
  padding-block: 1.5rem 3rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.practice-page {
  min-height: 100svh;
  overflow: hidden;
}

.back-link {
  position: fixed;
  z-index: 30;
  top: 1rem;
  left: 1rem;
  padding: 0.65rem 0.9rem;
  border: 1px solid rgb(255 255 255 / 10%);
  border-radius: 999px;
  background: rgb(22 22 21 / 82%);
  color: var(--text);
  font-size: 0.88rem;
  font-weight: 700;
  text-decoration: none;
  backdrop-filter: blur(12px);
}

.tinder {
  position: relative;
  width: 100vw;
  height: 100svh;
  opacity: 0;
  transition: opacity 120ms ease-in-out;
}

.tinder.loaded {
  opacity: 1;
}

.tinder--cards {
  position: absolute;
  inset: 4.5rem 4rem 5.5rem;
  display: grid;
  place-items: center;
}

.tinder--card {
  position: absolute;
  width: min(90vw, calc(74svh * 16 / 9), 1180px);
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border: 1px solid rgb(255 255 255 / 10%);
  border-radius: 1rem;
  background: #0f0f0f;
  box-shadow: 0 28px 80px rgb(0 0 0 / 45%);
  cursor: grab;
  touch-action: none;
  transition:
    opacity 280ms ease,
    transform 280ms ease;
  user-select: none;
  will-change: transform;
}

.tinder--card.moving {
  cursor: grabbing;
  transition: none;
}

.streetview-image {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
  pointer-events: none;
}

.intro-card {
  display: grid;
  place-items: center;
  padding: clamp(1.5rem, 5vw, 4rem);
  background:
    linear-gradient(135deg, rgb(212 168 82 / 20%), transparent 52%),
    var(--surface);
  text-align: center;
}

.intro-card__content {
  max-width: 48rem;
}

.intro-card h1 {
  margin: 0;
  font-size: clamp(2rem, 6vw, 4.5rem);
  letter-spacing: -0.045em;
}

.intro-card p {
  margin: 1rem auto 0;
  color: var(--muted);
  font-size: clamp(1rem, 2vw, 1.2rem);
  line-height: 1.6;
}

.image-attribution {
  position: absolute;
  right: 0.75rem;
  bottom: 0.65rem;
  padding: 0.2rem 0.4rem;
  border-radius: 0.25rem;
  background: rgb(0 0 0 / 62%);
  color: #fff;
  font-size: 12px;
  font-weight: 400;
  letter-spacing: normal;
  line-height: 1.2;
  pointer-events: none;
  white-space: nowrap;
}

/*
 * A soft glow on the side that was the right answer. It sits behind the cards, so
 * mostly what shows is the frame around the card lighting up on that side.
 * Radial falloff rather than clipped wedges: no hard diagonals to catch the eye.
 */
.tinder-zones {
  position: absolute;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
}

.tinder-zone {
  position: absolute;
  inset: 0;
  opacity: 0;
}

.tinder-zone--left {
  background: radial-gradient(
    ellipse 62% 100% at 0% 50%,
    rgb(85 214 138 / 30%),
    rgb(85 214 138 / 17%) 30%,
    rgb(85 214 138 / 6%) 54%,
    transparent 76%
  );
}

.tinder-zone--top {
  background: radial-gradient(
    ellipse 100% 62% at 50% 0%,
    rgb(85 214 138 / 30%),
    rgb(85 214 138 / 17%) 30%,
    rgb(85 214 138 / 6%) 54%,
    transparent 76%
  );
}

.tinder-zone--right {
  background: radial-gradient(
    ellipse 62% 100% at 100% 50%,
    rgb(85 214 138 / 30%),
    rgb(85 214 138 / 17%) 30%,
    rgb(85 214 138 / 6%) 54%,
    transparent 76%
  );
}

.tinder-zone--bottom {
  background: radial-gradient(
    ellipse 100% 62% at 50% 100%,
    rgb(85 214 138 / 30%),
    rgb(85 214 138 / 17%) 30%,
    rgb(85 214 138 / 6%) 54%,
    transparent 76%
  );
}

.tinder-zone.is-answer {
  animation: zone-answer-flash 760ms ease-in-out;
}

@keyframes zone-answer-flash {
  0% {
    opacity: 0;
  }

  24% {
    opacity: 1;
  }

  55% {
    opacity: 0.62;
  }

  100% {
    opacity: 0;
  }
}

.tinder-labels {
  position: absolute;
  z-index: 20;
  inset: 0;
  pointer-events: none;
}

.direction-label {
  position: absolute;
  max-width: min(36vw, 20rem);
  padding: 0.5rem 0.75rem;
  border: 1px solid rgb(255 255 255 / 10%);
  border-radius: 0.65rem;
  background: rgb(22 22 21 / 78%);
  color: var(--text);
  font-size: clamp(0.82rem, 2vw, 1.05rem);
  font-weight: 800;
  text-align: center;
  backdrop-filter: blur(10px);
}

/* Each label keeps its centring transform in a variable so the answer pulse can compose with it. */
.direction-label--left {
  --label-transform: translateY(-50%);

  top: 50%;
  left: 0.75rem;
  transform: var(--label-transform);
}

.direction-label--top {
  --label-transform: translateX(-50%);

  top: 0.75rem;
  left: 50%;
  transform: var(--label-transform);
}

.direction-label--right {
  --label-transform: translateY(-50%);

  top: 50%;
  right: 0.75rem;
  transform: var(--label-transform);
}

.direction-label--bottom {
  --label-transform: translateX(-50%);

  bottom: 0.75rem;
  left: 50%;
  transform: var(--label-transform);
}

/* Flashes the label that was the right answer after a wrong swipe. */
.direction-label.is-answer {
  animation: direction-answer-pulse 760ms ease-out;
}

@keyframes direction-answer-pulse {
  0% {
    border-color: var(--correct);
    background: rgb(85 214 138 / 34%);
    box-shadow: 0 0 0 0 rgb(85 214 138 / 60%);
    transform: var(--label-transform) scale(1);
  }

  22% {
    transform: var(--label-transform) scale(1.2);
  }

  100% {
    border-color: rgb(63 174 138 / 48%);
    background: rgb(18 22 21 / 82%);
    box-shadow: 0 0 0 1.4rem rgb(85 214 138 / 0%);
    transform: var(--label-transform) scale(1);
  }
}

@media (prefers-reduced-motion: reduce) {
  .direction-label.is-answer {
    border-color: var(--correct);
    background: rgb(85 214 138 / 34%);
    animation: none;
  }

  .tinder-zone.is-answer {
    opacity: 1;
    animation: none;
  }
}

.tinder-status {
  position: absolute;
  z-index: 25;
  top: 50%;
  left: 50%;
  pointer-events: none;
  transform: translate(-50%, -50%);
}

.status-symbol {
  position: absolute;
  display: grid;
  width: clamp(5rem, 14vw, 8rem);
  aspect-ratio: 1;
  place-items: center;
  border: 0.35rem solid currentColor;
  border-radius: 50%;
  font-size: clamp(3rem, 9vw, 5rem);
  font-weight: 900;
  opacity: 0;
  transform: translate(-50%, -50%) scale(0.55);
  transition:
    opacity 120ms ease,
    transform 120ms ease;
}

.status-symbol--correct {
  color: var(--correct);
}

.status-symbol--incorrect {
  color: var(--incorrect);
}

.tinder.is-correct .status-symbol--correct,
.tinder.is-incorrect .status-symbol--incorrect {
  opacity: 1;
  transform: translate(-50%, -50%) scale(1);
}

.practice-controls {
  position: fixed;
  z-index: 30;
  right: 1rem;
  bottom: 1rem;
  display: flex;
  gap: 0.6rem;
}

.control-button {
  min-width: 4.5rem;
  padding: 0.7rem 1rem;
  border: 1px solid rgb(255 255 255 / 12%);
  border-radius: 999px;
  background: rgb(36 35 32 / 92%);
  color: var(--text);
  cursor: pointer;
  font-size: 0.88rem;
  font-weight: 800;
  box-shadow: 0 8px 24px rgb(0 0 0 / 25%);
}

.control-button:hover {
  border-color: rgb(212 168 82 / 55%);
  color: var(--accent-strong);
}

.stats-dialog {
  position: fixed;
  inset: 0 0 0 auto;
  width: min(640px, 100%);
  max-width: none;
  height: 100dvh;
  max-height: none;
  margin: 0;
  padding: 0;
  overflow: hidden;
  border: 0;
  background: transparent;
  color: var(--text);
}

.stats-dialog[open] {
  animation: stats-drawer-in 180ms ease-out;
}

.stats-dialog::backdrop {
  background: rgb(5 8 8 / 68%);
  backdrop-filter: blur(5px);
}

.stats-drawer {
  height: 100%;
  padding: clamp(1.25rem, 4vw, 2.25rem);
  overflow-y: auto;
  border-left: 1px solid rgb(255 255 255 / 10%);
  background:
    radial-gradient(circle at 90% 0%, rgb(212 168 82 / 14%), transparent 25rem),
    #1d1c1a;
  box-shadow: -24px 0 70px rgb(0 0 0 / 35%);
}

.stats-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
}

.stats-header h2,
.stats-section-heading h3 {
  margin: 0;
  letter-spacing: -0.035em;
}

.stats-header h2 {
  font-size: clamp(1.8rem, 5vw, 2.6rem);
}

.stats-eyebrow {
  margin: 0 0 0.35rem;
  color: var(--accent-strong);
  font-size: 0.7rem;
  font-weight: 850;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.stats-quiz-title {
  margin: 0.35rem 0 0;
  color: var(--muted);
  font-weight: 700;
}

.stats-close {
  display: grid;
  width: 2.6rem;
  flex: 0 0 auto;
  aspect-ratio: 1;
  place-items: center;
  border: 1px solid rgb(255 255 255 / 12%);
  border-radius: 50%;
  background: rgb(255 255 255 / 5%);
  color: var(--text);
  cursor: pointer;
  font-size: 1.5rem;
}

.stats-storage-note {
  margin: 1.25rem 0;
  padding: 0.8rem 0.9rem;
  border: 1px solid rgb(85 214 138 / 18%);
  border-radius: 0.75rem;
  background: rgb(85 214 138 / 6%);
  color: #a9d9bb;
  font-size: 0.78rem;
  line-height: 1.5;
}

.stats-storage-note[hidden] {
  display: none;
}

.stats-metrics {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
}

.stats-metrics article {
  min-width: 0;
  padding: 1rem;
  border: 1px solid rgb(255 255 255 / 8%);
  border-radius: 1rem;
  background: linear-gradient(145deg, var(--surface-raised), var(--surface));
}

.stats-metrics span,
.stats-metrics small {
  display: block;
  color: var(--muted);
  font-size: 0.68rem;
}

.stats-metrics span {
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.stats-metrics strong {
  display: block;
  margin: 0.35rem 0 0.15rem;
  color: var(--accent-strong);
  font-size: clamp(1.65rem, 5vw, 2.35rem);
  letter-spacing: -0.05em;
}

.stats-trend {
  margin: 0.85rem 0 1.3rem;
  color: var(--text);
  font-size: 0.86rem;
  font-weight: 700;
  line-height: 1.5;
}

.stats-chart-card {
  margin-top: 0.9rem;
  padding: 1rem;
  border: 1px solid rgb(255 255 255 / 8%);
  border-radius: 1rem;
  background: rgb(36 35 32 / 82%);
}

.stats-section-heading {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 0.75rem;
}

.stats-section-heading h3 {
  font-size: 1.05rem;
}

.chart-legend {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0.5rem 0.75rem;
  color: var(--muted);
  font-size: 0.62rem;
}

.chart-legend span {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.legend-line {
  display: inline-block;
  width: 1.15rem;
  border-top: 2px solid var(--accent-strong);
}

.legend-line--dashed {
  border-color: var(--muted);
  border-top-style: dashed;
}

.stats-chart-card canvas {
  display: block;
  width: 100%;
}

.stats-chart-summary {
  margin: 0.45rem 0 0;
  color: var(--muted);
  font-size: 0.72rem;
  line-height: 1.5;
}

.category-stats {
  display: grid;
  gap: 0.85rem;
}

.category-progress-row > div:first-child {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 0.4rem;
}

.category-progress-row strong {
  overflow: hidden;
  font-size: 0.8rem;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.category-progress-row > div:first-child span {
  flex: 0 0 auto;
  color: var(--muted);
  font-size: 0.68rem;
}

.category-progress-track {
  height: 0.5rem;
  overflow: hidden;
  border-radius: 999px;
  background: rgb(255 255 255 / 7%);
}

.category-progress-track span {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--accent), var(--correct));
  transition: width 240ms ease;
}

.stats-actions {
  display: flex;
  justify-content: flex-end;
  gap: 0.6rem;
  padding-top: 1.25rem;
}

.stats-actions button {
  padding: 0.65rem 0.9rem;
  border: 1px solid rgb(255 255 255 / 12%);
  border-radius: 999px;
  background: transparent;
  color: var(--text);
  cursor: pointer;
  font-size: 0.75rem;
  font-weight: 800;
}

.stats-actions .stats-reset {
  border-color: rgb(255 107 107 / 28%);
  color: #ffaaaa;
}

.stats-fine-print {
  margin: 0.9rem 0 0;
  padding-top: 0.9rem;
  border-top: 1px solid rgb(255 255 255 / 7%);
  color: #8f887d;
  font-size: 0.66rem;
  line-height: 1.55;
}

.stats-close:focus-visible,
.stats-actions button:focus-visible {
  outline: 3px solid var(--accent-strong);
  outline-offset: 3px;
}

@keyframes stats-drawer-in {
  from {
    opacity: 0;
    transform: translateX(2rem);
  }

  to {
    opacity: 1;
    transform: translateX(0);
  }
}

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

@media (max-width: 720px) {
  .site-header__inner {
    min-height: 3.5rem;
  }

  .tinder--cards {
    inset: 4rem 2.75rem 5rem;
  }

  .direction-label {
    max-width: 42vw;
    padding: 0.4rem 0.55rem;
  }

  .direction-label--left {
    left: 0.4rem;
  }

  .direction-label--right {
    right: 0.4rem;
  }

  .stats-dialog {
    width: 100%;
  }

  .stats-drawer {
    border-left: 0;
  }

  .stats-section-heading {
    align-items: flex-start;
    flex-direction: column;
  }

  .chart-legend {
    justify-content: flex-start;
  }
}

@media (max-aspect-ratio: 3 / 4) {
  .tinder--card {
    width: min(86vw, calc(70svh * 9 / 16));
    aspect-ratio: 9 / 16;
  }
}

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

/* Homepage: Terrain Emerald direction from the supplied design reference. */
.home-page {
  --home-background: #121615;
  --home-surface: #1c2422;
  --home-surface-raised: #26302d;
  --home-text: #f2f7f4;
  --home-muted: #a6b8b2;
  --home-muted-subtle: #7c8c86;
  --home-accent: #7fe0bf;
  --home-accent-deep: #3fae8a;
  min-height: 100vh;
  background:
    radial-gradient(circle at 50% 0%, rgb(63 174 138 / 12%), transparent 34rem),
    var(--home-background);
  color: var(--home-text);
}

.home-page .site-header {
  position: sticky;
  border-color: rgb(255 255 255 / 8%);
  background: rgb(18 22 21 / 88%);
}

.home-page .site-header__inner {
  width: min(1312px, calc(100% - 3rem));
  min-height: 5.25rem;
}

.home-page .brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--home-text);
  font-size: 1.25rem;
  letter-spacing: -0.01em;
}

.brand__mark {
  position: relative;
  width: 2rem;
  flex: 0 0 auto;
  aspect-ratio: 1;
  border-radius: 50%;
  background: linear-gradient(145deg, var(--home-accent), var(--home-accent-deep));
  box-shadow: 0 0 0.9rem rgb(63 174 138 / 18%);
}

.brand__mark::after {
  position: absolute;
  width: 0.625rem;
  aspect-ratio: 1;
  border-radius: 50%;
  background: var(--home-background);
  content: "";
  inset: 50% auto auto 50%;
  transform: translate(-50%, -50%);
}

.home-nav {
  display: flex;
  align-items: center;
  gap: clamp(1.25rem, 3vw, 2.5rem);
}

.home-nav > a:not(.button) {
  color: var(--home-muted);
  font-size: 0.94rem;
  font-weight: 650;
  text-decoration: none;
  transition: color 160ms ease;
}

.home-nav > a:not(.button):hover {
  color: var(--home-text);
}

.button {
  display: inline-flex;
  min-height: 3.4rem;
  align-items: center;
  justify-content: center;
  padding: 0.85rem 1.65rem;
  border: 1px solid var(--home-accent);
  border-radius: 999px;
  background: var(--home-accent);
  color: #0d1513;
  font-size: 0.97rem;
  font-weight: 800;
  text-decoration: none;
  transition:
    background-color 160ms ease,
    border-color 160ms ease,
    box-shadow 160ms ease,
    transform 160ms ease;
}

.button:hover {
  border-color: #9aebcf;
  background: #9aebcf;
  box-shadow: 0 0.75rem 2rem rgb(63 174 138 / 18%);
  transform: translateY(-2px);
}

.button--small {
  min-height: 2.75rem;
  padding: 0.65rem 1.35rem;
  font-size: 0.9rem;
}

.button--secondary {
  border-color: rgb(255 255 255 / 18%);
  background: transparent;
  color: var(--home-text);
}

.button--secondary:hover {
  border-color: rgb(127 224 191 / 55%);
  background: rgb(127 224 191 / 7%);
}

.home-page .brand:focus-visible,
.home-page .home-nav a:focus-visible,
.home-page .button:focus-visible,
.home-page .practice-card:focus-visible,
.home-page .site-footer a:focus-visible {
  outline: 3px solid var(--home-accent);
  outline-offset: 4px;
}

/*
 * The hero glow is inset past its container on purpose, to bleed around the card.
 * Clip the horizontal axis at the viewport edge so that bleed cannot widen the
 * document and add a stray scrollbar on narrow screens. `clip` rather than
 * `hidden`, which would turn main into a scroll container.
 */
.home-page main {
  overflow-x: clip;
}

.home-hero {
  display: grid;
  width: min(1312px, calc(100% - 3rem));
  margin-inline: auto;
  padding-block: clamp(4rem, 8vw, 7.25rem);
  align-items: center;
  gap: clamp(3rem, 6vw, 5.5rem);
  grid-template-columns: minmax(0, 1.05fr) minmax(380px, 0.95fr);
}

.home-hero__copy {
  max-width: 44rem;
}

.home-page .eyebrow,
.section-kicker {
  margin: 0;
  color: var(--home-accent);
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.home-hero h1 {
  margin: 1.25rem 0 0;
  font-size: clamp(4.5rem, 8vw, 7rem);
  letter-spacing: -0.065em;
  line-height: 0.92;
}

.home-hero__intro {
  max-width: 35rem;
  margin: 1.65rem 0 0;
  color: var(--home-muted);
  font-size: clamp(1.05rem, 1.8vw, 1.2rem);
  line-height: 1.65;
}

.home-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  margin-top: 2.25rem;
}

.home-hero__proof {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin: 1.65rem 0 0;
  color: var(--home-muted-subtle);
  font-size: 0.88rem;
}

.home-hero__proof strong {
  color: var(--home-accent-deep);
}

.scene-preview {
  position: relative;
  min-width: 0;
}

.scene-preview__glow {
  position: absolute;
  z-index: 0;
  background: radial-gradient(circle, rgb(63 174 138 / 20%), transparent 70%);
  filter: blur(10px);
  inset: -2.5rem;
}

.scene-preview__card {
  position: relative;
  z-index: 1;
  padding: clamp(0.9rem, 2vw, 1.5rem);
  border: 1px solid rgb(255 255 255 / 8%);
  border-radius: 1.75rem;
  background: var(--home-surface);
  box-shadow: 0 1.875rem 5rem rgb(0 0 0 / 45%);
}

.scene-preview__image-wrap {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  border-radius: 1.1rem;
  background:
    linear-gradient(135deg, rgb(127 224 191 / 10%), transparent),
    #17201e;
}

.scene-preview__image-wrap--unavailable::before,
.practice-card__media--unavailable::before {
  position: absolute;
  width: 28%;
  aspect-ratio: 1;
  border: 1px solid rgb(127 224 191 / 25%);
  border-radius: 50%;
  content: "";
  inset: 50% auto auto 50%;
  transform: translate(-50%, -50%);
}

.scene-preview__image-wrap--unavailable::after,
.practice-card__media--unavailable::after {
  position: absolute;
  width: 9%;
  aspect-ratio: 1;
  border-radius: 50%;
  background: var(--home-accent-deep);
  content: "";
  inset: 50% auto auto 50%;
  opacity: 0.7;
  transform: translate(-50%, -50%);
}

.scene-preview__image {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.scene-preview__label {
  position: absolute;
  top: 50%;
  padding: 0.45rem 0.75rem;
  border: 1px solid rgb(127 224 191 / 45%);
  border-radius: 0.65rem;
  background: rgb(13 21 19 / 82%);
  color: var(--home-text);
  font-size: clamp(0.72rem, 1.2vw, 0.82rem);
  font-weight: 800;
  backdrop-filter: blur(8px);
  transform: translateY(-50%);
}

.scene-preview__label--left {
  left: 0.875rem;
}

.scene-preview__label--right {
  right: 0.875rem;
}

.scene-preview__source {
  position: absolute;
  right: 0.65rem;
  bottom: 0.65rem;
  padding: 0.2rem 0.45rem;
  border-radius: 0.3rem;
  background: rgb(0 0 0 / 62%);
  color: #fff;
  font-size: 0.65rem;
}

.scene-preview__card > p {
  margin: 0.9rem 0 0;
  color: var(--home-muted-subtle);
  font-size: 0.82rem;
  text-align: center;
}

.home-stats {
  display: grid;
  padding: 2.5rem max(1.5rem, calc((100% - 1312px) / 2));
  border-block: 1px solid rgb(255 255 255 / 8%);
  gap: 2rem;
  grid-template-columns: repeat(4, 1fr);
}

.home-stats__item {
  min-width: 0;
}

.home-stats__item strong,
.home-stats__item span {
  display: block;
}

.home-stats__item strong {
  color: var(--home-accent);
  font-size: clamp(1.9rem, 4vw, 2.4rem);
  letter-spacing: -0.04em;
}

.home-stats__item span {
  margin-top: 0.25rem;
  color: var(--home-muted-subtle);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.home-section {
  width: min(1312px, calc(100% - 3rem));
  margin-inline: auto;
  padding-block: clamp(5rem, 9vw, 7rem);
  scroll-margin-top: 5rem;
}

.home-section h2 {
  margin: 0.9rem 0 0;
  font-size: clamp(2.35rem, 5vw, 3.25rem);
  letter-spacing: -0.045em;
  line-height: 1.06;
}

.how-it-works {
  border-bottom: 1px solid rgb(255 255 255 / 8%);
}

.steps {
  display: grid;
  margin-top: 3.25rem;
  gap: clamp(2rem, 4vw, 3.5rem);
  grid-template-columns: repeat(3, 1fr);
}

.step__number {
  display: grid;
  width: 2.9rem;
  aspect-ratio: 1;
  place-items: center;
  border: 2px solid var(--home-accent-deep);
  border-radius: 50%;
  color: var(--home-accent);
  font-size: 1.05rem;
  font-weight: 800;
}

.step h3 {
  margin: 1.1rem 0 0;
  font-size: 1.25rem;
}

.step p {
  max-width: 24rem;
  margin: 0.55rem 0 0;
  color: var(--home-muted);
  font-size: 0.95rem;
  line-height: 1.65;
}

.practice-sets {
  padding-bottom: clamp(6rem, 10vw, 8.5rem);
}

.practice-sets__intro {
  margin: 0.9rem 0 0;
  color: var(--home-muted);
  line-height: 1.6;
}

.home-page .practice-grid {
  display: grid;
  margin-top: 2.75rem;
  gap: 1.75rem;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.home-page .loading-message {
  border-color: rgb(255 255 255 / 8%);
  background: var(--home-surface);
  color: var(--home-muted);
}

.home-page .practice-card {
  display: flex;
  min-height: 0;
  overflow: hidden;
  padding: 0;
  border: 1px solid rgb(255 255 255 / 8%);
  border-radius: 1.25rem;
  background: linear-gradient(145deg, var(--home-surface-raised), var(--home-surface));
  box-shadow: none;
  transform: none;
  transition:
    border-color 180ms ease,
    box-shadow 180ms ease,
    transform 180ms ease;
}

.home-page .practice-card:hover {
  border-color: rgb(63 174 138 / 50%);
  box-shadow: 0 1.25rem 3rem rgb(0 0 0 / 18%);
  transform: translateY(-4px);
}

.practice-card__media {
  position: relative;
  display: block;
  height: 11.875rem;
  flex: 0 0 auto;
  overflow: hidden;
  background:
    linear-gradient(135deg, rgb(127 224 191 / 10%), transparent),
    #17201e;
}

.practice-card__image {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 300ms ease;
}

.practice-card:hover .practice-card__image {
  transform: scale(1.025);
}

.practice-card__content {
  display: flex;
  min-height: 16.5rem;
  flex: 1;
  flex-direction: column;
  padding: 1.35rem;
}

.home-page .practice-card h3 {
  margin: 0;
  font-size: 1.25rem;
  letter-spacing: -0.025em;
}

.home-page .practice-card p {
  margin: 0.55rem 0 0;
  color: var(--home-muted);
  font-size: 0.9rem;
  line-height: 1.55;
}

.practice-card__directions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.9rem;
}

.practice-card__directions > span {
  padding: 0.25rem 0.6rem;
  border: 1px solid rgb(255 255 255 / 8%);
  border-radius: 999px;
  background: rgb(255 255 255 / 5%);
  color: var(--home-muted);
  font-size: 0.68rem;
  font-weight: 700;
}

.home-page .practice-card__action {
  margin-top: auto;
  padding-top: 1.1rem;
  color: var(--home-accent);
  font-size: 0.88rem;
}

.home-page .site-footer {
  display: flex;
  width: min(1312px, calc(100% - 3rem));
  align-items: center;
  justify-content: space-between;
  padding-block: 2.5rem;
  border-top: 1px solid rgb(255 255 255 / 8%);
  color: var(--home-muted-subtle);
  font-size: 0.8rem;
}

.home-page .site-footer div,
.home-page .site-footer span {
  display: block;
}

.home-page .site-footer strong {
  color: var(--home-text);
  font-size: 0.95rem;
}

.home-page .site-footer span {
  margin-top: 0.25rem;
}

.home-page .site-footer a {
  color: var(--home-muted-subtle);
}

@media (max-width: 1040px) {
  .home-hero {
    grid-template-columns: 1fr 0.9fr;
  }

  .home-hero h1 {
    font-size: clamp(4rem, 9vw, 6rem);
  }

  .home-page .practice-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 820px) {
  .home-page .site-header__inner {
    width: min(100% - 2rem, 1312px);
    min-height: 4.5rem;
  }

  .home-nav > a:not(.button) {
    display: none;
  }

  .home-hero {
    width: min(100% - 2rem, 1312px);
    padding-top: 3.5rem;
    grid-template-columns: 1fr;
  }

  .home-hero__copy {
    max-width: 40rem;
  }

  .scene-preview {
    width: min(100%, 40rem);
  }

  .home-stats {
    grid-template-columns: repeat(2, 1fr);
  }

  .home-section,
  .home-page .site-footer {
    width: min(100% - 2rem, 1312px);
  }

  .steps {
    grid-template-columns: 1fr;
  }

  .step {
    display: grid;
    max-width: 40rem;
    column-gap: 1rem;
    grid-template-columns: auto 1fr;
  }

  .step__number {
    grid-row: span 2;
  }

  .step h3 {
    align-self: end;
    margin: 0;
  }

  .step p {
    margin-top: 0.35rem;
  }
}

@media (max-width: 580px) {
  .home-page .brand {
    font-size: 1.05rem;
  }

  .brand__mark {
    width: 1.75rem;
  }

  .home-nav .button {
    min-height: 2.5rem;
    padding-inline: 1rem;
    font-size: 0.8rem;
  }

  .home-hero h1 {
    font-size: clamp(3.6rem, 20vw, 5rem);
  }

  .home-hero__actions {
    align-items: stretch;
    flex-direction: column;
  }

  .home-hero__actions .button {
    width: 100%;
  }

  .home-stats {
    gap: 1.75rem 1rem;
  }

  .home-stats__item span {
    font-size: 0.65rem;
  }

  .home-page .practice-grid {
    grid-template-columns: 1fr;
  }

  .home-page .site-footer {
    align-items: flex-start;
    flex-direction: column;
    gap: 1.25rem;
  }
}

/* Quiz shell: emerald HUD and progress drawer. Card styling and mechanics stay intact. */
.practice-page {
  --background: #121615;
  --surface: #1c2422;
  --surface-raised: #26302d;
  --text: #f2f7f4;
  --muted: #a6b8b2;
  --accent: #3fae8a;
  --accent-strong: #7fe0bf;
  background:
    radial-gradient(circle at 50% 0%, rgb(63 174 138 / 13%), transparent 34rem),
    var(--background);
}

.quiz-header {
  position: fixed;
  z-index: 35;
  top: 0;
  right: 0;
  left: 0;
  display: grid;
  min-height: 4.75rem;
  padding: 0.7rem clamp(1rem, 2.5vw, 2rem);
  align-items: center;
  border-bottom: 1px solid rgb(255 255 255 / 8%);
  background: rgb(18 22 21 / 78%);
  backdrop-filter: blur(16px);
  grid-template-columns: minmax(9rem, 1fr) minmax(18rem, 2.2fr) minmax(9rem, 1fr);
}

.practice-page .back-link {
  position: static;
  display: inline-flex;
  width: max-content;
  align-items: center;
  gap: 0.65rem;
  padding: 0;
  border: 0;
  border-radius: 0;
  background: transparent;
  color: var(--muted);
  font-size: 0.86rem;
  backdrop-filter: none;
  transition: color 160ms ease;
}

.back-link__arrow {
  display: grid;
  width: 2rem;
  aspect-ratio: 1;
  place-items: center;
  border: 1px solid rgb(255 255 255 / 10%);
  border-radius: 50%;
  background: rgb(255 255 255 / 4%);
  color: var(--text);
  font-size: 1rem;
  transition:
    border-color 160ms ease,
    transform 160ms ease;
}

.practice-page .back-link:hover {
  color: var(--text);
}

.practice-page .back-link:hover .back-link__arrow {
  border-color: rgb(127 224 191 / 45%);
  transform: translateX(-2px);
}

.quiz-context {
  min-width: 0;
  text-align: center;
}

.quiz-context p {
  overflow: hidden;
  margin: 0;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.quiz-context__title {
  color: var(--text);
  font-size: 1rem;
  font-weight: 800;
  letter-spacing: -0.01em;
}

.quiz-context__detail {
  margin-top: 0.2rem;
  color: var(--muted);
  font-size: 0.72rem;
}

/* Sits in the same row as the instructions so the header never changes height. */
.quiz-context__miss {
  display: inline-flex;
  max-width: 100%;
  align-items: baseline;
  gap: 0.3rem;
}

.quiz-context__miss[hidden] {
  display: none;
}

.quiz-context__miss-mark {
  color: var(--incorrect);
  font-weight: 900;
}

.quiz-context__miss-label {
  overflow: hidden;
  min-width: 0;
  color: var(--text);
  font-weight: 800;
  text-overflow: ellipsis;
}

.quiz-brand {
  display: inline-flex;
  width: max-content;
  align-items: center;
  justify-self: end;
  gap: 0.6rem;
  color: var(--text);
  font-size: 0.88rem;
  font-weight: 800;
  text-decoration: none;
}

.quiz-brand__mark {
  position: relative;
  width: 1.75rem;
  aspect-ratio: 1;
  border-radius: 50%;
  background: linear-gradient(145deg, var(--accent-strong), var(--accent));
  box-shadow: 0 0 1.25rem rgb(63 174 138 / 18%);
}

.quiz-brand__mark::after {
  position: absolute;
  width: 0.52rem;
  aspect-ratio: 1;
  border-radius: 50%;
  background: var(--background);
  content: "";
  inset: 50% auto auto 50%;
  transform: translate(-50%, -50%);
}

.practice-page .direction-label {
  padding: 0.6rem 0.9rem;
  border: 1px solid rgb(63 174 138 / 48%);
  border-radius: 0.85rem;
  background: rgb(18 22 21 / 82%);
  color: var(--text);
  font-size: clamp(0.78rem, 1.5vw, 0.92rem);
  box-shadow:
    0 0.75rem 2rem rgb(0 0 0 / 18%),
    inset 0 1px rgb(255 255 255 / 4%);
  backdrop-filter: blur(12px);
}

.practice-page .direction-label--left {
  left: clamp(0.75rem, 2.5vw, 2.25rem);
}

.practice-page .direction-label--top {
  top: 5.55rem;
}

.practice-page .direction-label--right {
  right: clamp(0.75rem, 2.5vw, 2.25rem);
}

.practice-page .direction-label--bottom {
  bottom: 5.9rem;
}

.practice-page .intro-card {
  background:
    radial-gradient(circle at 50% 0%, rgb(127 224 191 / 13%), transparent 60%),
    linear-gradient(145deg, var(--surface-raised), var(--surface));
}

.practice-page .intro-card h1 {
  color: var(--text);
}

.practice-page .intro-card p {
  color: var(--muted);
}

.practice-page .intro-card #quizStartHint {
  width: max-content;
  max-width: 100%;
  padding: 0.55rem 0.9rem;
  border: 1px solid rgb(63 174 138 / 28%);
  border-radius: 999px;
  background: rgb(63 174 138 / 9%);
  color: var(--accent-strong);
  font-size: 0.84rem;
  font-weight: 750;
}

.practice-page .practice-controls {
  right: auto;
  bottom: 1.1rem;
  left: 50%;
  gap: 0.25rem;
  padding: 0.45rem;
  border: 1px solid rgb(255 255 255 / 10%);
  border-radius: 999px;
  background: rgb(28 36 34 / 88%);
  box-shadow: 0 0.75rem 2.5rem rgb(0 0 0 / 36%);
  backdrop-filter: blur(14px);
  transform: translateX(-50%);
}

.practice-page .control-button {
  min-width: 5rem;
  padding: 0.65rem 1rem;
  border-color: transparent;
  background: transparent;
  color: var(--muted);
  box-shadow: none;
  transition:
    background-color 160ms ease,
    color 160ms ease;
}

.practice-page .control-button:hover {
  border-color: transparent;
  background: rgb(127 224 191 / 9%);
  color: var(--accent-strong);
}

.practice-page #pin::after,
.practice-page #revert::after {
  display: inline-grid;
  min-width: 1.25rem;
  min-height: 1.25rem;
  margin-left: 0.45rem;
  place-items: center;
  border: 1px solid rgb(255 255 255 / 12%);
  border-radius: 0.3rem;
  color: var(--muted);
  content: "";
  font-size: 0.58rem;
  line-height: 1;
  vertical-align: 0.08rem;
}

.practice-page #pin::after {
  content: "P";
}

.practice-page #revert::after {
  content: "R";
}

.practice-page .status-symbol {
  background: rgb(18 22 21 / 48%);
  box-shadow: 0 1rem 3rem rgb(0 0 0 / 24%);
  backdrop-filter: blur(5px);
}

.practice-page .status-symbol--correct {
  box-shadow:
    0 0 2.5rem rgb(85 214 138 / 22%),
    0 1rem 3rem rgb(0 0 0 / 24%);
}

.practice-page .status-symbol--incorrect {
  font-size: 0;
  box-shadow:
    0 0 2.5rem rgb(255 107 107 / 18%),
    0 1rem 3rem rgb(0 0 0 / 24%);
}

.practice-page .status-symbol--incorrect::before,
.practice-page .status-symbol--incorrect::after {
  position: absolute;
  top: 50%;
  left: 50%;
  width: clamp(2.5rem, 7vw, 3.8rem);
  height: clamp(0.42rem, 1vw, 0.6rem);
  border-radius: 999px;
  background: currentColor;
  content: "";
  transform: translate(-50%, -50%) rotate(45deg);
}

.practice-page .status-symbol--incorrect::after {
  transform: translate(-50%, -50%) rotate(-45deg);
}

.practice-page .stats-dialog {
  width: min(680px, 100%);
}

.practice-page .stats-dialog::backdrop {
  background: rgb(5 8 8 / 72%);
  backdrop-filter: blur(7px);
}

.practice-page .stats-drawer {
  padding: clamp(1.25rem, 4vw, 2.25rem);
  border-color: rgb(255 255 255 / 9%);
  background:
    radial-gradient(circle at 90% 0%, rgb(63 174 138 / 15%), transparent 28rem),
    #181d1b;
}

.practice-page .stats-drawer::-webkit-scrollbar {
  width: 0.65rem;
}

.practice-page .stats-drawer::-webkit-scrollbar-track {
  background: #181d1b;
}

.practice-page .stats-drawer::-webkit-scrollbar-thumb {
  border: 0.18rem solid #181d1b;
  border-radius: 999px;
  background: rgb(127 224 191 / 24%);
}

.practice-page .stats-eyebrow {
  color: var(--accent-strong);
}

.practice-page .stats-header h2,
.practice-page .stats-section-heading h3 {
  color: var(--text);
}

.practice-page .stats-quiz-title,
.practice-page .stats-chart-summary {
  color: var(--muted);
}

.practice-page .stats-close {
  background: rgb(255 255 255 / 5%);
  transition:
    background-color 160ms ease,
    border-color 160ms ease,
    color 160ms ease,
    transform 160ms ease;
}

.practice-page .stats-close:hover {
  border-color: rgb(127 224 191 / 36%);
  background: rgb(127 224 191 / 8%);
  color: var(--accent-strong);
  transform: rotate(5deg);
}

.practice-page .stats-storage-note {
  border-color: rgb(127 224 191 / 20%);
  background: rgb(127 224 191 / 6%);
  color: #acd9c9;
}

.practice-page .stats-metrics article {
  border-color: rgb(255 255 255 / 7%);
  background: linear-gradient(145deg, var(--surface-raised), var(--surface));
  box-shadow: inset 0 1px rgb(255 255 255 / 3%);
}

.practice-page .stats-metrics strong {
  color: var(--accent-strong);
}

.practice-page .stats-chart-card {
  border-color: rgb(255 255 255 / 7%);
  background: rgb(28 36 34 / 84%);
  box-shadow: inset 0 1px rgb(255 255 255 / 3%);
}

.practice-page .legend-line {
  border-color: var(--accent-strong);
}

.practice-page .legend-line--dashed {
  border-color: var(--muted);
}

.practice-page .category-progress-track {
  background: rgb(255 255 255 / 7%);
}

.practice-page .category-progress-track span {
  background: linear-gradient(90deg, var(--accent), var(--correct));
}

.practice-page .stats-actions button {
  transition:
    background-color 160ms ease,
    border-color 160ms ease,
    color 160ms ease;
}

.practice-page .stats-actions button:not(.stats-reset):hover {
  border-color: rgb(127 224 191 / 38%);
  background: rgb(127 224 191 / 8%);
  color: var(--accent-strong);
}

.practice-page .stats-actions .stats-reset:hover {
  background: rgb(255 107 107 / 7%);
}

.practice-page .stats-fine-print {
  color: #7c8c86;
}

.practice-page .quiz-header a:focus-visible,
.practice-page .control-button:focus-visible,
.practice-page .stats-close:focus-visible,
.practice-page .stats-actions button:focus-visible {
  outline-color: var(--accent-strong);
}

@media (max-width: 760px) {
  .quiz-header {
    min-height: 4.25rem;
    padding-inline: 0.75rem;
    grid-template-columns: auto minmax(0, 1fr) auto;
  }

  .practice-page .back-link {
    gap: 0;
  }

  .practice-page .back-link > span:last-child,
  .quiz-brand > span:last-child,
  #quizHudInstructions {
    display: none;
  }

  .quiz-brand__mark {
    width: 1.8rem;
  }

  .quiz-context__title {
    padding-inline: 0.65rem;
    font-size: 0.9rem;
  }

  .practice-page .direction-label {
    max-width: 40vw;
    padding: 0.45rem 0.65rem;
    font-size: 0.75rem;
  }

  .practice-page .direction-label--top {
    top: 4.85rem;
  }

  .practice-page .direction-label--bottom {
    bottom: 5.5rem;
  }

  .practice-page .practice-controls {
    bottom: 0.75rem;
  }

  .practice-page .control-button {
    min-width: 0;
    padding: 0.6rem 0.75rem;
    font-size: 0.8rem;
  }

  .practice-page #pin::after,
  .practice-page #revert::after {
    display: none;
  }
}

@media (max-width: 430px) {
  .practice-page .direction-label--left {
    left: 0.35rem;
  }

  .practice-page .direction-label--right {
    right: 0.35rem;
  }

  .practice-page .practice-controls {
    width: max-content;
    max-width: calc(100% - 1rem);
  }

  .practice-page .stats-metrics {
    gap: 0.45rem;
  }

  .practice-page .stats-metrics article {
    padding: 0.75rem 0.65rem;
  }
}