:root {
  --bg-top: #f2e6d0;
  --bg-bottom: #e4d5bc;
  --surface: rgba(255, 251, 244, 0.84);
  --surface-strong: rgba(255, 252, 247, 0.94);
  --surface-soft: rgba(255, 255, 255, 0.54);
  --ink: #18211f;
  --muted: #5f665f;
  --line: rgba(24, 33, 31, 0.12);
  --accent: #a14832;
  --accent-soft: rgba(161, 72, 50, 0.18);
  --accent-strong: #cf6b4b;
  --alt: #294c42;
  --alt-soft: rgba(41, 76, 66, 0.18);
  --gold: #d0a04b;
  --shadow: 0 28px 80px rgba(47, 35, 21, 0.12);
  --shadow-soft: 0 16px 34px rgba(47, 35, 21, 0.08);
  --serif: "Source Han Serif SC", "Noto Serif SC", "Songti SC", serif;
  --sans: "PingFang SC", "Noto Sans SC", "Hiragino Sans GB", sans-serif;
}

:root[data-theme="forest"] {
  --bg-top: #ebf0e6;
  --bg-bottom: #d1d9cf;
  --surface: rgba(248, 251, 245, 0.84);
  --surface-strong: rgba(252, 255, 249, 0.94);
  --surface-soft: rgba(255, 255, 255, 0.58);
  --ink: #16221d;
  --muted: #4e5f57;
  --line: rgba(22, 34, 29, 0.12);
  --accent: #2f6a53;
  --accent-soft: rgba(47, 106, 83, 0.18);
  --accent-strong: #439171;
  --alt: #90643a;
  --alt-soft: rgba(144, 100, 58, 0.18);
  --gold: #caa46d;
}

:root[data-theme="ink"] {
  --bg-top: #101417;
  --bg-bottom: #181d22;
  --surface: rgba(22, 27, 31, 0.88);
  --surface-strong: rgba(28, 34, 39, 0.96);
  --surface-soft: rgba(255, 255, 255, 0.04);
  --ink: #f2ece4;
  --muted: #c2baaf;
  --line: rgba(255, 248, 239, 0.1);
  --accent: #df8558;
  --accent-soft: rgba(223, 133, 88, 0.18);
  --accent-strong: #f59a70;
  --alt: #88aca0;
  --alt-soft: rgba(136, 172, 160, 0.16);
  --gold: #e5b66f;
  --shadow: 0 28px 90px rgba(0, 0, 0, 0.28);
  --shadow-soft: 0 16px 34px rgba(0, 0, 0, 0.22);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

html {
  background:
    radial-gradient(circle at top left, color-mix(in srgb, var(--accent) 16%, transparent), transparent 28%),
    radial-gradient(circle at 86% 18%, color-mix(in srgb, var(--alt) 14%, transparent), transparent 30%),
    linear-gradient(180deg, var(--bg-top) 0%, var(--bg-bottom) 100%);
  color: var(--ink);
  font-family: var(--sans);
}

body {
  position: relative;
  color: var(--ink);
  overflow-x: hidden;
}

button,
select {
  font: inherit;
}

.page-glow {
  position: fixed;
  pointer-events: none;
  filter: blur(72px);
  opacity: 0.72;
}

.page-glow-a {
  top: -8rem;
  right: -7rem;
  width: 28rem;
  height: 28rem;
  background: color-mix(in srgb, var(--accent) 25%, transparent);
}

.page-glow-b {
  left: -7rem;
  bottom: 8rem;
  width: 24rem;
  height: 24rem;
  background: color-mix(in srgb, var(--alt) 22%, transparent);
}

.shell {
  position: relative;
  width: min(1320px, calc(100vw - 1.4rem));
  margin: 0 auto;
  padding: 1rem 0 2rem;
}

.topbar,
.arena-grid {
  opacity: 0;
  transform: translateY(18px);
  animation: rise-in 0.55s ease forwards;
}

.arena-grid {
  animation-delay: 0.08s;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  margin-bottom: 0.9rem;
}

.entry-strip {
  display: inline-grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
}

.entry-tile {
  min-width: 8.8rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.98rem 1.4rem;
  background: linear-gradient(180deg, var(--surface-strong), var(--surface));
  color: var(--ink);
  box-shadow: var(--shadow-soft);
  cursor: pointer;
  transition:
    transform 0.18s ease,
    background-color 0.18s ease,
    border-color 0.18s ease,
    box-shadow 0.18s ease;
}

.entry-tile:hover,
.option-card:hover,
.next-round-btn:hover {
  transform: translateY(-2px);
}

.entry-tile.active {
  border-color: transparent;
  color: #fff8ee;
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  box-shadow: 0 18px 36px color-mix(in srgb, var(--accent) 24%, transparent);
}

.entry-tile:disabled {
  opacity: 0.42;
  cursor: not-allowed;
  transform: none;
}

.theme-picker {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.32rem 0.38rem 0.32rem 1rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: color-mix(in srgb, var(--surface-soft) 92%, transparent);
  box-shadow: var(--shadow-soft);
}

.theme-picker span,
.meta-label,
.rank-kicker,
.panel-head p,
.panel-head span {
  margin: 0;
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}

.theme-picker select {
  border: 0;
  background: transparent;
  color: var(--ink);
  padding: 0.45rem 0.7rem;
  border-radius: 999px;
  outline: none;
}

.arena-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.58fr) minmax(280px, 0.72fr);
  gap: 1rem;
}

.battle-stage,
.leaderboard-panel {
  border: 1px solid var(--line);
  border-radius: 2rem;
  background: linear-gradient(180deg, var(--surface-strong), var(--surface));
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

.battle-stage {
  padding: 1.2rem;
}

.stage-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--line);
}

.rank-badge {
  display: grid;
  gap: 0.22rem;
  padding: 1rem 1.1rem;
  min-width: min(18rem, 100%);
  border-radius: 1.6rem;
  border: 1px solid color-mix(in srgb, var(--accent) 22%, var(--line));
  background: linear-gradient(180deg, color-mix(in srgb, var(--accent-soft) 82%, transparent), color-mix(in srgb, var(--surface-strong) 90%, transparent));
}

.rank-badge strong,
.question-stem,
.completion-crest {
  font-family: var(--serif);
  font-weight: 700;
}

.rank-badge strong {
  font-size: clamp(2rem, 3vw, 2.7rem);
  line-height: 1;
}

.rank-badge em {
  font-style: normal;
  color: var(--muted);
}

.stage-meta {
  display: grid;
  grid-template-columns: repeat(2, minmax(120px, 1fr));
  gap: 0.75rem;
}

.meta-chip {
  display: grid;
  gap: 0.28rem;
  padding: 0.9rem 1rem;
  border-radius: 1.3rem;
  border: 1px solid var(--line);
  background: color-mix(in srgb, var(--surface-soft) 90%, transparent);
}

.meta-chip strong {
  font-size: clamp(1.2rem, 2vw, 1.55rem);
}

.question-root {
  min-height: 36rem;
  padding: 1.15rem 0 0.95rem;
}

.question-card {
  display: grid;
  gap: 1rem;
}

.question-source {
  font-size: 0.92rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.question-stem {
  margin: 0;
  font-size: clamp(1.42rem, 2.2vw, 2.04rem);
  line-height: 1.28;
}

.question-context,
.question-passage {
  padding: 1.18rem 1.22rem;
  border-radius: 1.4rem;
  border: 1px solid color-mix(in srgb, var(--line) 88%, transparent);
  background: color-mix(in srgb, var(--surface-soft) 96%, transparent);
  font-size: clamp(1.12rem, 1.55vw, 1.32rem);
  line-height: 1.82;
  word-break: break-word;
  cursor: help;
}

.question-passage {
  max-height: 25rem;
  overflow: auto;
}

.context-preview {
  display: grid;
  gap: 0.42rem;
}

.context-line {
  margin: 0;
  padding: 0.28rem 0.38rem;
  border-radius: 0.72rem;
}

.context-line.is-focus {
  background: color-mix(in srgb, var(--accent-soft) 52%, transparent);
  border-left: 3px solid color-mix(in srgb, var(--accent) 58%, transparent);
}

.term-hit {
  padding: 0 0.2rem;
  border-radius: 0.35rem;
  color: var(--accent-strong);
  background: color-mix(in srgb, var(--accent) 16%, transparent);
  font-weight: 700;
}

.option-list {
  display: grid;
  gap: 0.84rem;
}

.option-card {
  width: 100%;
  text-align: left;
  border: 1px solid transparent;
  border-radius: 1.45rem;
  padding: 1.18rem 1.22rem;
  background: color-mix(in srgb, var(--surface-strong) 88%, transparent);
  box-shadow: var(--shadow-soft);
  cursor: pointer;
  transition:
    transform 0.18s ease,
    border-color 0.18s ease,
    background-color 0.18s ease,
    opacity 0.18s ease;
}

.option-card.selected {
  border-color: color-mix(in srgb, var(--accent) 46%, var(--line));
}

.option-card.correct {
  border-color: color-mix(in srgb, var(--alt) 46%, var(--line));
  background: color-mix(in srgb, var(--alt-soft) 86%, var(--surface-strong));
}

.option-card.incorrect {
  border-color: color-mix(in srgb, var(--accent) 46%, var(--line));
  background: color-mix(in srgb, var(--accent-soft) 84%, var(--surface-strong));
}

.option-card.dimmed {
  opacity: 0.5;
}

.option-card:disabled {
  cursor: default;
}

.option-head {
  display: flex;
  align-items: center;
  gap: 0.8rem;
}

.option-tag {
  display: inline-grid;
  place-items: center;
  width: 2.18rem;
  height: 2.18rem;
  border-radius: 999px;
  background: color-mix(in srgb, var(--alt) 18%, transparent);
  font-weight: 800;
}

.option-card p,
.option-sentence,
.pair-sentence {
  margin: 0;
  font-size: clamp(1.02rem, 1.35vw, 1.14rem);
  line-height: 1.72;
}

.option-sentence {
  margin-top: 0.72rem;
  padding: 0.82rem 0.9rem;
  border-radius: 1rem;
  background: color-mix(in srgb, var(--surface-soft) 94%, transparent);
  border-left: 3px solid color-mix(in srgb, var(--gold) 58%, transparent);
  cursor: help;
}

.option-gloss {
  margin-top: 0.72rem;
  font-size: clamp(0.98rem, 1.2vw, 1.08rem);
  line-height: 1.68;
}

.pair-sentences {
  display: grid;
  gap: 0.6rem;
  margin-top: 0.78rem;
}

.pair-sentence {
  padding: 0.86rem 0.92rem;
  border-radius: 1rem;
  background: color-mix(in srgb, var(--surface-soft) 94%, transparent);
  border-left: 3px solid color-mix(in srgb, var(--gold) 58%, transparent);
  cursor: help;
}

.analysis-card,
.completion-card,
.empty-state,
.leaderboard-empty {
  border: 1px solid var(--line);
  border-radius: 1.5rem;
  background: color-mix(in srgb, var(--surface-soft) 90%, transparent);
}

.analysis-card {
  display: grid;
  gap: 0.8rem;
  padding: 1.05rem 1.1rem;
}

.analysis-card.good {
  border-color: color-mix(in srgb, var(--alt) 44%, var(--line));
}

.analysis-card.bad {
  border-color: color-mix(in srgb, var(--accent) 44%, var(--line));
}

.analysis-head {
  display: flex;
  justify-content: space-between;
  gap: 0.75rem;
  align-items: center;
  flex-wrap: wrap;
}

.analysis-head strong {
  font-size: 1.3rem;
}

.analysis-summary {
  margin: 0;
  font-size: 1.22rem;
  line-height: 1.96;
  color: var(--ink);
  white-space: pre-wrap;
}

.analysis-list {
  display: grid;
  gap: 0.55rem;
}

.analysis-item {
  display: grid;
  grid-template-columns: 1.5rem minmax(0, 1fr);
  gap: 0.7rem;
  align-items: start;
}

.analysis-item span {
  display: inline-grid;
  place-items: center;
  width: 1.5rem;
  height: 1.5rem;
  border-radius: 999px;
  background: color-mix(in srgb, var(--surface-strong) 96%, transparent);
  font-size: 0.88rem;
  font-weight: 700;
}

.analysis-item.is-correct span {
  background: color-mix(in srgb, var(--alt-soft) 88%, transparent);
}

.analysis-item p {
  margin: 0;
  font-size: 1.14rem;
  line-height: 1.9;
  color: var(--ink);
  white-space: pre-wrap;
}

.analysis-support {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
}

.analysis-actions,
.completion-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
}

.support-chip {
  display: inline-flex;
  align-items: center;
  max-width: 100%;
  padding: 0.5rem 0.8rem;
  border-radius: 999px;
  background: color-mix(in srgb, var(--alt-soft) 76%, transparent);
  font-size: 0.9rem;
  line-height: 1.4;
}

.completion-card {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 1rem;
  align-items: center;
  padding: 1rem 1.1rem;
}

.completion-card.up {
  border-color: color-mix(in srgb, var(--gold) 56%, var(--line));
}

.completion-card.hold {
  border-color: color-mix(in srgb, var(--accent) 40%, var(--line));
}

.completion-crest {
  display: grid;
  place-items: center;
  min-width: 5.6rem;
  min-height: 5.6rem;
  padding: 0.6rem;
  border-radius: 1.25rem;
  background: linear-gradient(135deg, color-mix(in srgb, var(--gold) 74%, transparent), color-mix(in srgb, var(--accent-soft) 70%, transparent));
  font-size: 1.15rem;
  text-align: center;
}

.completion-copy {
  display: grid;
  gap: 0.22rem;
}

.completion-copy strong {
  font-size: 1.18rem;
}

.completion-copy span {
  color: var(--muted);
}

.completion-note {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.6;
}

.next-round-btn {
  border: 0;
  border-radius: 999px;
  padding: 0.88rem 1.18rem;
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  color: #fff9f2;
  cursor: pointer;
}

.ghost-btn {
  border: 1px solid color-mix(in srgb, var(--line) 92%, transparent);
  border-radius: 999px;
  padding: 0.88rem 1.18rem;
  background: color-mix(in srgb, var(--surface-soft) 94%, transparent);
  color: var(--ink);
  cursor: pointer;
}

.round-track {
  display: grid;
  grid-template-columns: repeat(10, minmax(0, 1fr));
  gap: 0.56rem;
}

.track-slot {
  height: 0.72rem;
  border-radius: 999px;
  background: color-mix(in srgb, var(--alt) 10%, transparent);
  overflow: hidden;
}

.track-slot.pending {
  opacity: 0.52;
}

.track-slot.current {
  background: linear-gradient(90deg, color-mix(in srgb, var(--gold) 72%, transparent), color-mix(in srgb, var(--accent-soft) 72%, transparent));
}

.track-slot.hit {
  background: linear-gradient(90deg, var(--alt), color-mix(in srgb, var(--gold) 72%, var(--alt)));
}

.track-slot.miss {
  background: linear-gradient(90deg, var(--accent), var(--accent-strong));
}

.side-panel {
  display: grid;
}

.leaderboard-panel {
  padding: 1rem;
}

.panel-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.8rem;
  margin-bottom: 0.9rem;
}

.leaderboard-root {
  display: grid;
  gap: 0.8rem;
}

.leaderboard-row {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.75rem;
  align-items: center;
  padding: 0.88rem 0.92rem;
  border-radius: 1.3rem;
  border: 1px solid var(--line);
  background: color-mix(in srgb, var(--surface-soft) 92%, transparent);
}

.leaderboard-rank {
  display: inline-grid;
  place-items: center;
  width: 2.3rem;
  height: 2.3rem;
  border-radius: 999px;
  background: color-mix(in srgb, var(--accent-soft) 86%, transparent);
  font-size: 0.9rem;
  font-weight: 700;
}

.leaderboard-main {
  display: grid;
  gap: 0.24rem;
}

.leaderboard-main strong {
  font-size: 1rem;
}

.leaderboard-tier {
  font-size: 0.92rem;
  color: var(--muted);
}

.leaderboard-bar {
  height: 0.46rem;
  border-radius: 999px;
  overflow: hidden;
  background: color-mix(in srgb, var(--alt) 10%, transparent);
}

.leaderboard-bar i {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--accent), var(--gold));
}

.empty-state,
.leaderboard-empty {
  display: grid;
  place-items: center;
  min-height: 18rem;
  text-align: center;
  padding: 1.4rem;
  color: var(--muted);
}

.leaderboard-empty {
  min-height: 10rem;
}

.error-state {
  border-color: color-mix(in srgb, var(--accent) 40%, var(--line));
}

@keyframes rise-in {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 980px) {
  .arena-grid {
    grid-template-columns: 1fr;
  }

  .question-root {
    min-height: 0;
  }

  .side-panel {
    order: 2;
  }
}

@media (max-width: 720px) {
  .shell {
    width: min(100vw - 0.9rem, 100%);
    padding-top: 0.72rem;
  }

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

  .entry-strip {
    width: 100%;
  }

  .entry-tile {
    min-width: 0;
  }

  .theme-picker {
    width: 100%;
    justify-content: space-between;
  }

  .stage-head {
    flex-direction: column;
    align-items: stretch;
  }

  .stage-meta {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .question-stem {
    font-size: clamp(1.24rem, 4.9vw, 1.6rem);
  }

  .question-context,
  .question-passage {
    font-size: 1rem;
    line-height: 1.68;
  }

  .option-card p,
  .option-sentence,
  .pair-sentence {
    font-size: 0.98rem;
    line-height: 1.66;
  }

  .option-gloss {
    font-size: 0.92rem;
    line-height: 1.6;
  }

  .completion-card {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .completion-crest {
    margin: 0 auto;
  }

  .analysis-actions,
  .completion-actions {
    justify-content: center;
  }
}