:root {
  color-scheme: dark;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --text: #f7f9fc;
  --muted: #bdc8d6;
  --panel: rgba(7, 14, 24, 0.82);
  --panel-strong: #0b1420;
  --panel-border: rgba(255, 255, 255, 0.13);
  --accent: #f4bd50;
  --accent-text: #171006;
  --focus: #ffe09a;
  --success: #49d49d;
  --danger: #ff7474;
  --page-background:
    radial-gradient(circle at 18% 12%, rgba(48, 123, 176, 0.22), transparent 34%),
    radial-gradient(circle at 82% 78%, rgba(8, 66, 105, 0.3), transparent 38%),
    linear-gradient(145deg, #071525 0%, #091c30 47%, #02070d 100%);
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
  background: #071525;
  touch-action: pan-x pan-y;
}

body {
  min-width: 320px;
  min-height: 100vh;
  min-height: 100dvh;
  margin: 0;
  color: var(--text);
  background: var(--page-background);
  background-attachment: fixed;
  background-size: cover;
  transition: background 280ms ease;
}

body::before {
  position: fixed;
  inset: 0;
  z-index: -1;
  content: "";
  pointer-events: none;
  background: linear-gradient(180deg, rgba(0, 0, 0, 0.04), rgba(0, 0, 0, 0.34));
}

html[data-background="classic-theater"] {
  --page-background:
    radial-gradient(ellipse at 50% -12%, rgba(239, 172, 82, 0.18), transparent 38%),
    repeating-linear-gradient(98deg, transparent 0 9%, rgba(255, 65, 86, 0.11) 12%, transparent 17%),
    linear-gradient(115deg, #220309 0%, #690d22 48%, #190206 100%);
  --accent: #f3c66a;
  --panel: rgba(25, 4, 9, 0.86);
  --panel-strong: #21070d;
}

html[data-background="neon-nights"] {
  --page-background:
    radial-gradient(circle at 22% 74%, rgba(46, 218, 255, 0.28), transparent 25%),
    radial-gradient(circle at 72% 38%, rgba(239, 39, 255, 0.31), transparent 32%),
    linear-gradient(135deg, #07051f 5%, #241071 46%, #10021c 100%);
  --accent: #40e6ff;
  --accent-text: #031318;
  --panel: rgba(9, 5, 33, 0.84);
  --panel-strong: #10082c;
  --focus: #69efff;
}

html[data-background="minimal-dark"] {
  --page-background: linear-gradient(145deg, #18191b 0%, #101113 58%, #08090a 100%);
  --accent: #f1f3f5;
  --accent-text: #111214;
  --panel: rgba(18, 19, 21, 0.92);
  --panel-strong: #151618;
  --focus: #ffffff;
}

button,
a {
  font: inherit;
}

button {
  color: inherit;
}

button:focus-visible,
a:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 3px;
}

.app-shell {
  width: min(100% - 32px, 1080px);
  min-height: 100vh;
  min-height: 100dvh;
  margin: 0 auto;
}

.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 76px;
}

.user-greeting {
  width: fit-content;
  padding: 8px 13px;
  margin: 2px 0 0 auto;
  color: var(--muted);
  font-size: 0.88rem;
  font-weight: 750;
  background: rgba(4, 9, 16, 0.5);
  border: 1px solid var(--panel-border);
  border-radius: 999px;
  backdrop-filter: blur(12px);
}

.brand {
  display: inline-flex;
  gap: 10px;
  align-items: center;
  color: var(--text);
  font-size: 1.02rem;
  font-weight: 800;
  letter-spacing: 0.01em;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 34px;
  height: 34px;
  color: var(--accent-text);
  background: var(--accent);
  border-radius: 10px;
  place-items: center;
}

.icon-button {
  display: grid;
  width: 44px;
  height: 44px;
  padding: 0;
  font-size: 1.45rem;
  cursor: pointer;
  background: rgba(4, 9, 16, 0.62);
  border: 1px solid var(--panel-border);
  border-radius: 50%;
  place-items: center;
  backdrop-filter: blur(12px);
}

.home-content {
  display: grid;
  max-width: 680px;
  min-height: calc(100dvh - 116px);
  padding: clamp(48px, 10vh, 112px) 0 72px;
  align-content: center;
}

.eyebrow,
.card-label {
  margin: 0 0 8px;
  color: var(--accent);
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

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

h1 {
  max-width: 650px;
  margin-bottom: 18px;
  font-size: clamp(2.6rem, 9vw, 5.4rem);
  line-height: 0.98;
  letter-spacing: -0.055em;
}

.intro {
  max-width: 590px;
  margin-bottom: 34px;
  color: var(--muted);
  font-size: clamp(1rem, 3vw, 1.2rem);
  line-height: 1.6;
}

.game-mode-list {
  display: grid;
  gap: 14px;
}

.feature-card {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 18px;
  align-items: center;
  padding: 20px;
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 22px;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.25);
  backdrop-filter: blur(18px);
}

.feature-card h2 {
  margin-bottom: 5px;
  font-size: 1.25rem;
}

.feature-card p:last-child {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.feature-icon {
  display: grid;
  width: 46px;
  height: 46px;
  color: var(--accent-text);
  background: var(--accent);
  border-radius: 14px;
  place-items: center;
}

.hot-streak-card .feature-icon {
  background: linear-gradient(145deg, #ffd45f, #ff7448);
}

.primary-button {
  min-height: 46px;
  padding: 0 22px;
  color: var(--accent-text);
  font-weight: 800;
  cursor: pointer;
  background: var(--accent);
  border: 0;
  border-radius: 999px;
}

.secondary-button {
  min-height: 46px;
  padding: 0 22px;
  color: var(--text);
  font-weight: 800;
  cursor: pointer;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--panel-border);
  border-radius: 999px;
}

.primary-button:hover,
.secondary-button:hover {
  filter: brightness(1.08);
}

[hidden] {
  display: none !important;
}

.game-screen,
.results-screen {
  width: min(100%, 780px);
  min-height: calc(100dvh - 76px);
  padding: 34px 0 64px;
  margin: 0 auto;
}

.game-status {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
  font-variant-numeric: tabular-nums;
}

.game-status > div {
  display: grid;
  gap: 3px;
}

.score-status {
  text-align: right;
}

.status-label {
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.game-status strong {
  font-size: 1.05rem;
}

.progress-track {
  height: 5px;
  margin-bottom: 18px;
  overflow: hidden;
  background: rgba(255, 255, 255, 0.12);
  border-radius: 99px;
}

.progress-track span {
  display: block;
  width: 10%;
  height: 100%;
  background: var(--accent);
  border-radius: inherit;
  transition: width 240ms ease;
}

.question-card,
.results-card {
  padding: clamp(20px, 5vw, 38px);
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 24px;
  box-shadow: 0 24px 70px rgba(0, 0, 0, 0.3);
  backdrop-filter: blur(18px);
}

.question-header {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  justify-content: flex-end;
  margin-bottom: 22px;
}

.question-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.question-meta span {
  padding: 7px 10px;
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  background: rgba(255, 255, 255, 0.065);
  border: 1px solid var(--panel-border);
  border-radius: 999px;
}

.timer {
  --timer-progress: 100%;
  position: relative;
  display: grid;
  flex: 0 0 auto;
  width: 58px;
  height: 58px;
  font-variant-numeric: tabular-nums;
  background: conic-gradient(var(--accent) var(--timer-progress), rgba(255, 255, 255, 0.12) 0);
  border-radius: 50%;
  place-items: center;
}

.timer::before {
  position: absolute;
  inset: 5px;
  content: "";
  background: var(--panel-strong);
  border-radius: inherit;
}

.timer span {
  position: relative;
  font-size: 1.15rem;
  font-weight: 900;
}

.timer-warning {
  color: var(--danger);
}

.question-text {
  max-width: 680px;
  margin-bottom: 28px;
  font-size: clamp(1.55rem, 5vw, 2.35rem);
  line-height: 1.2;
  letter-spacing: -0.025em;
  text-wrap: balance;
}

.answer-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.answer-button {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 13px;
  align-items: center;
  min-height: 68px;
  padding: 11px 14px;
  color: var(--text);
  font-weight: 700;
  line-height: 1.35;
  text-align: left;
  cursor: pointer;
  background: rgba(255, 255, 255, 0.055);
  border: 1px solid var(--panel-border);
  border-radius: 15px;
  transition:
    background 150ms ease,
    border-color 150ms ease,
    transform 150ms ease;
}

.answer-button:hover:not(:disabled) {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.3);
  transform: translateY(-1px);
}

.answer-button:disabled {
  color: var(--text);
  cursor: default;
  opacity: 0.68;
}

.answer-letter {
  display: grid;
  width: 34px;
  height: 34px;
  font-size: 0.78rem;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 10px;
  place-items: center;
}

.answer-button.answer-correct {
  color: #061a12;
  background: var(--success);
  border-color: var(--success);
  opacity: 1;
}

.answer-button.answer-incorrect {
  color: #260606;
  background: var(--danger);
  border-color: var(--danger);
  opacity: 1;
}

.answer-correct .answer-letter,
.answer-incorrect .answer-letter {
  background: rgba(255, 255, 255, 0.35);
}

.answer-feedback {
  min-height: 24px;
  margin: 18px 0 0;
  font-weight: 800;
  text-align: center;
}

.feedback-correct {
  color: var(--success);
}

.feedback-incorrect,
.feedback-timeout {
  color: var(--danger);
}

.results-screen {
  display: grid;
  align-content: center;
}

.results-card {
  text-align: center;
}

.results-card h1 {
  margin-bottom: 10px;
  font-size: clamp(2.3rem, 8vw, 4.2rem);
}

.results-summary {
  margin-bottom: 24px;
  color: var(--muted);
  font-size: 1.05rem;
}

.final-score {
  display: grid;
  margin-bottom: 28px;
}

.final-score strong {
  color: var(--accent);
  font-size: clamp(4.8rem, 18vw, 7.5rem);
  line-height: 0.9;
  letter-spacing: -0.065em;
}

.final-score span {
  margin-top: 10px;
  color: var(--muted);
  font-weight: 700;
}

.results-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-bottom: 14px;
}

.results-stats.results-stats-single {
  grid-template-columns: minmax(0, 220px);
  justify-content: center;
}

.results-stats div {
  display: grid;
  gap: 5px;
  padding: 16px 8px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--panel-border);
  border-radius: 14px;
}

.results-stats strong {
  font-size: 1.35rem;
}

.results-stats span {
  color: var(--muted);
  font-size: 0.73rem;
}

.results-breakdown {
  margin: 0 0 28px;
  color: var(--muted);
  font-size: 0.85rem;
  font-weight: 700;
}

.top-scores {
  padding-top: 24px;
  margin: 0 0 28px;
  text-align: left;
  border-top: 1px solid var(--panel-border);
}

.top-scores-heading {
  margin-bottom: 14px;
  text-align: center;
}

.top-scores-heading h2 {
  margin: 0;
  font-size: 1.2rem;
}

.top-scores-list {
  display: grid;
  gap: 9px;
  padding: 0;
  margin: 0;
  list-style: none;
}

.top-score-row {
  position: relative;
  display: grid;
  grid-template-columns: 34px 84px minmax(0, 1fr) auto;
  gap: 10px;
  align-items: center;
  min-height: 58px;
  padding: 11px 13px;
  background: rgba(255, 255, 255, 0.045);
  border: 1px solid var(--panel-border);
  border-radius: 14px;
}

.top-score-row.top-score-hot-streak {
  grid-template-columns: 34px minmax(0, 1fr) 34px;
  text-align: center;
}

.top-score-current {
  background: color-mix(in srgb, var(--accent) 13%, var(--panel-strong));
  border-color: var(--accent);
  box-shadow: 0 0 0 1px color-mix(in srgb, var(--accent) 28%, transparent);
}

.top-score-rank {
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 900;
}

.top-score-value strong {
  font-size: 1.18rem;
}

.top-score-value span,
.top-score-details,
.top-score-date {
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 700;
}

.top-score-date {
  white-space: nowrap;
}

.top-score-current-badge {
  position: absolute;
  top: -9px;
  right: 10px;
  padding: 3px 7px;
  color: var(--accent-text);
  font-size: 0.62rem;
  font-weight: 900;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  background: var(--accent);
  border-radius: 999px;
}

.results-actions {
  display: flex;
  gap: 10px;
  justify-content: center;
}

.settings-dialog {
  width: min(calc(100% - 28px), 700px);
  max-height: min(86dvh, 760px);
  padding: 0;
  color: var(--text);
  background: var(--panel-strong);
  border: 1px solid var(--panel-border);
  border-radius: 24px;
  box-shadow: 0 32px 90px rgba(0, 0, 0, 0.58);
}

.name-dialog {
  width: min(calc(100% - 28px), 440px);
  padding: 0;
  color: var(--text);
  background: var(--panel-strong);
  border: 1px solid var(--panel-border);
  border-radius: 24px;
  box-shadow: 0 32px 90px rgba(0, 0, 0, 0.58);
}

.name-dialog::backdrop {
  background: rgba(0, 0, 0, 0.76);
  backdrop-filter: blur(10px);
}

.name-form {
  display: grid;
  gap: 14px;
  padding: 28px;
}

.name-form h2 {
  margin: 0;
  font-size: clamp(1.65rem, 7vw, 2.2rem);
  line-height: 1.08;
}

.name-form > p:not(.eyebrow) {
  margin: 0 0 4px;
  color: var(--muted);
  line-height: 1.55;
}

.name-form label {
  font-size: 0.82rem;
  font-weight: 800;
}

.name-form input {
  width: 100%;
  min-height: 50px;
  padding: 0 15px;
  color: var(--text);
  font: inherit;
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid var(--panel-border);
  border-radius: 13px;
}

.name-form input::placeholder {
  color: var(--muted);
  opacity: 0.75;
}

.name-form input:focus {
  border-color: var(--accent);
  outline: 3px solid color-mix(in srgb, var(--accent) 30%, transparent);
}

.name-form .primary-button {
  margin-top: 6px;
}

.settings-dialog::backdrop {
  background: rgba(0, 0, 0, 0.68);
  backdrop-filter: blur(8px);
}

.dialog-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  padding: 24px 24px 18px;
  border-bottom: 1px solid var(--panel-border);
}

.dialog-header h2 {
  margin: 0;
  font-size: 1.75rem;
}

.settings-section {
  padding: 24px;
}

.player-settings {
  border-bottom: 1px solid var(--panel-border);
}

.player-settings .section-heading p {
  margin-bottom: 14px;
}

.section-heading h3 {
  margin-bottom: 6px;
  font-size: 1.05rem;
}

.section-heading p {
  margin-bottom: 20px;
  color: var(--muted);
  line-height: 1.5;
}

.background-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.background-option {
  position: relative;
  display: grid;
  gap: 10px;
  padding: 9px;
  overflow: hidden;
  text-align: left;
  cursor: pointer;
  background: rgba(255, 255, 255, 0.045);
  border: 2px solid transparent;
  border-radius: 16px;
}

.background-option:hover {
  background: rgba(255, 255, 255, 0.08);
}

.background-option[aria-checked="true"] {
  border-color: var(--accent);
}

.background-option[aria-checked="true"]::after {
  position: absolute;
  top: 17px;
  right: 17px;
  display: grid;
  width: 25px;
  height: 25px;
  color: var(--accent-text);
  font-size: 0.82rem;
  font-weight: 900;
  content: "✓";
  background: var(--accent);
  border-radius: 50%;
  place-items: center;
}

.background-preview {
  width: 100%;
  aspect-ratio: 16 / 8;
  background: var(--preview-background);
  background-size: cover;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 10px;
}

.background-name {
  padding: 0 4px 3px;
  font-size: 0.9rem;
  font-weight: 750;
}

.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;
}

@media (max-width: 560px) {
  .app-shell {
    width: min(100% - 24px, 1080px);
  }

  .home-content {
    padding-top: 30px;
    align-content: start;
  }

  .user-greeting {
    margin-right: auto;
    text-align: center;
  }

  .name-dialog {
    width: calc(100% - 24px);
    border-radius: 22px;
  }

  .name-form {
    padding: 24px 20px;
  }

  .home-content > .eyebrow,
  .home-content > h1,
  .home-content > .intro {
    text-align: center;
  }

  .home-content > h1 {
    text-wrap: balance;
  }

  .feature-card {
    grid-template-columns: auto 1fr;
  }

  .primary-button {
    grid-column: 1 / -1;
    width: 100%;
  }

  .settings-dialog {
    width: 100%;
    max-width: none;
    max-height: 90dvh;
    margin: auto 0 0;
    border-radius: 24px 24px 0 0;
  }

  .dialog-header,
  .settings-section {
    padding-right: 18px;
    padding-left: 18px;
  }

  .background-grid {
    gap: 10px;
  }

  .game-screen,
  .results-screen {
    padding-top: 16px;
  }

  .question-card,
  .results-card {
    border-radius: 20px;
  }

  .question-header {
    margin-bottom: 18px;
    justify-content: center;
  }

  .question-text {
    margin-bottom: 22px;
    text-align: center;
  }

  .answer-grid {
    grid-template-columns: 1fr;
    gap: 9px;
  }

  .answer-button {
    min-height: 60px;
  }

  .results-stats {
    grid-template-columns: repeat(3, 1fr);
  }

  .top-score-row {
    grid-template-columns: 30px 70px minmax(0, 1fr);
    gap: 8px;
  }

  .top-score-date {
    grid-column: 3;
  }

  .results-actions {
    display: grid;
  }
}

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