:root {
  --bg: #0a0a0f;
  --surface: #12121a;
  --border: #1e1e2e;
  --accent: #e8ff47;
  --accent2: #ff4757;
  --text: #f0f0f0;
  --muted: #8888aa;
  --correct: #47ff8e;
  --wrong: #ff4757;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Space Mono', monospace;
  height: 100dvh;
  overflow: hidden;
  user-select: none;
}

/* Scanline overlay */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background: repeating-linear-gradient(0deg,
      transparent,
      transparent 2px,
      rgba(0, 0, 0, 0.08) 2px,
      rgba(0, 0, 0, 0.08) 4px);
  pointer-events: none;
  z-index: 100;
}

/* ── 공통 레이아웃 ──
     각 화면은 전체 뷰포트를 채우며
     버튼 영역은 하단에 고정, 콘텐츠는 나머지 공간에서 중앙 정렬 */
.screen {
  display: none;
  position: fixed;
  inset: 0;
  flex-direction: column;
  align-items: center;
  animation: fadeIn 0.2s ease;
}

.screen.active {
  display: flex;
}

/* 버튼 위 콘텐츠 영역 — 남은 공간을 채우며 중앙 정렬 */
.screen-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 24px;
  width: 100%;
  max-width: 480px;
  padding: 24px 24px 0;
  overflow: hidden;
}

/* 버튼 영역 — 하단 고정, 두 화면 모두 동일한 구조 */
.btn-zone {
  width: 100%;
  max-width: 480px;
  padding: 20px 24px 32px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.btn-hint {
  font-size: 10px;
  color: var(--muted);
  letter-spacing: 3px;
  text-transform: uppercase;
  text-align: center;
}

/* 두 버튼 나란히 — 시작/게임 공통 */
.btn-pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  width: 100%;
}

#screenResult {
  overflow-y: auto;
  justify-content: center;
  align-items: center;
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }

  to {
    opacity: 1;
  }
}

/* ─── LANGUAGE TOGGLE ─── */
.lang-toggle {
  position: fixed;
  top: 16px;
  right: 16px;
  z-index: 200;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--muted);
  font-family: 'Space Mono', monospace;
  font-size: 11px;
  letter-spacing: 2px;
  padding: 6px 12px;
  cursor: pointer;
  transition: all 0.15s;
}

.lang-toggle:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* keyboard hint inside rule-box */
.kbd-row {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.kbd {
  display: inline-block;
  background: var(--bg);
  border: 1px solid var(--muted);
  border-bottom-width: 2px;
  color: var(--text);
  font-family: 'Space Mono', monospace;
  font-size: 10px;
  padding: 2px 7px;
  border-radius: 3px;
  letter-spacing: 0;
}

.kbd-sep {
  color: var(--muted);
  font-size: 10px;
}

.logo {
  font-family: 'Bebas Neue', sans-serif;
  font-size: clamp(56px, 18vw, 90px);
  color: var(--accent);
  letter-spacing: 6px;
  line-height: 0.9;
  text-align: center;
  text-shadow: 0 0 40px rgba(232, 255, 71, 0.4);
}

.logo span {
  color: var(--text);
}

.subtitle {
  font-size: 11px;
  color: var(--muted);
  letter-spacing: 3px;
  text-transform: uppercase;
  text-align: center;
}

.rule-box {
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  padding: 20px 24px;
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.rule-item {
  font-size: 12px;
  color: var(--muted);
  letter-spacing: 0.5px;
  line-height: 1.6;
}

.rule-item em {
  color: var(--accent);
  font-style: normal;
  font-weight: 700;
}

/* ─── GAME SCREEN ─── */
.progress-dots {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  justify-content: center;
  width: 100%;
  padding: 4px 0;
}

.pdot {
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--border);
  transition: background 0.15s, box-shadow 0.15s;
  flex-shrink: 0;
}

.pdot.current {
  background: var(--muted);
  box-shadow: 0 0 5px rgba(255, 255, 255, 0.15);
}

.pdot.done-correct {
  background: var(--correct);
  box-shadow: 0 0 5px rgba(71, 255, 142, 0.5);
}

.pdot.done-wrong {
  background: var(--wrong);
  box-shadow: 0 0 5px rgba(255, 71, 87, 0.4);
}

.meta-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
  font-size: 11px;
  color: var(--muted);
  letter-spacing: 2px;
}

.meta-score {
  color: var(--accent);
  font-weight: 700;
  font-size: 13px;
}

.letter-display {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0;
  position: relative;
}

.label-next {
  font-size: 10px;
  color: var(--muted);
  letter-spacing: 4px;
  text-transform: uppercase;
  margin-bottom: 4px;
}

/* 선택지 표시줄 — 문제 알파벳 바로 아래 */
.choices-display {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  margin-top: 8px;
  width: 100%;
}

.choice-left-label,
.choice-right-label {
  font-family: 'Bebas Neue', sans-serif;
  font-size: clamp(36px, 11vw, 56px);
  line-height: 1;
  letter-spacing: 2px;
  transition: color 0.1s;
  flex: 1;
  text-align: center;
}

.choice-left-label {
  color: var(--text);
}

.choice-right-label {
  color: var(--text);
}

.choice-divider {
  font-size: 18px;
  color: var(--border);
  padding: 0 12px;
  flex-shrink: 0;
}

.current-letter {
  font-family: 'Bebas Neue', sans-serif;
  font-size: clamp(100px, 30vw, 160px);
  color: var(--text);
  line-height: 1;
  transition: all 0.15s;
  text-shadow: 0 0 60px rgba(240, 240, 240, 0.1);
}

.current-letter.flash-correct {
  color: var(--correct);
  text-shadow: 0 0 60px rgba(71, 255, 142, 0.5);
}

.current-letter.flash-wrong {
  color: var(--wrong);
  text-shadow: 0 0 60px rgba(255, 71, 87, 0.5);
  animation: shake 0.3s ease;
}

@keyframes shake {

  0%,
  100% {
    transform: translateX(0);
  }

  25% {
    transform: translateX(-8px);
  }

  75% {
    transform: translateX(8px);
  }
}

.choice-btn {
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--muted);
  font-family: 'Bebas Neue', sans-serif;
  font-size: 28px;
  letter-spacing: 2px;
  height: 100px;
  cursor: pointer;
  transition: all 0.12s;
  position: relative;
  overflow: hidden;
  text-align: center;
  width: 100%;
}

.choice-btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--accent);
  opacity: 0;
  transition: opacity 0.12s;
}

.choice-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-3px);
  box-shadow: 0 6px 20px rgba(232, 255, 71, 0.15);
}

.choice-btn:active {
  transform: translateY(0);
}

.choice-btn.correct {
  background: rgba(71, 255, 142, 0.1);
  border-color: var(--correct);
  color: var(--correct);
}

.choice-btn.wrong {
  background: rgba(255, 71, 87, 0.1);
  border-color: var(--wrong);
  color: var(--wrong);
}

.choice-btn:disabled {
  cursor: default;
  pointer-events: none;
}

/* ─── RESULT SCREEN ─── */
.result-container {
  width: 100%;
  max-width: 480px;
  height: 100%;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 16px;
  padding: 24px 24px 32px;
  overflow-y: auto;
}

.result-header {
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.result-title {
  font-family: 'Bebas Neue', sans-serif;
  font-size: clamp(32px, 9vw, 46px);
  color: var(--muted);
  letter-spacing: 5px;
  text-align: center;
}

.result-score-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 24px;
  width: 100%;
}

.result-score-block {
  display: flex;
  align-items: baseline;
  gap: 6px;
}

.score-label {
  font-size: 10px;
  color: var(--muted);
  letter-spacing: 3px;
  align-self: flex-start;
  padding-top: 6px;
}

.score-value {
  font-family: 'Bebas Neue', sans-serif;
  font-size: clamp(56px, 16vw, 80px);
  color: var(--accent);
  letter-spacing: 2px;
  line-height: 1;
  text-shadow: 0 0 30px rgba(232, 255, 71, 0.4);
}

.score-unit {
  font-size: 14px;
  color: var(--muted);
  align-self: flex-end;
  padding-bottom: 8px;
}

.result-grade {
  font-family: 'Bebas Neue', sans-serif;
  font-size: 72px;
  line-height: 1;
  letter-spacing: 2px;
}

/* Stats pills */
.stats-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  width: 100%;
  justify-content: center;
}

.stat-pill {
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 8px 12px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  flex: 1;
  min-width: 56px;
}

.stat-pill-label {
  font-size: 9px;
  color: var(--muted);
  letter-spacing: 1px;
  text-transform: uppercase;
}

.stat-pill-value {
  font-family: 'Bebas Neue', sans-serif;
  font-size: 18px;
  color: var(--text);
  letter-spacing: 1px;
}

.stat-pill-value.correct {
  color: var(--correct);
}

.stat-pill-value.wrong {
  color: var(--wrong);
}

.stat-pill-value.best {
  color: var(--accent);
}

.stat-pill-value.muted {
  color: var(--muted);
}

/* ─── RESULT TABLE ─── */
.result-table-wrap {
  width: 100%;
  border: 1px solid var(--border);
  max-height: 280px;
  overflow-y: auto;
}

.result-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 11px;
}

.result-table th {
  background: var(--surface);
  color: var(--muted);
  padding: 7px 8px;
  text-align: center;
  font-weight: 400;
  letter-spacing: 1.5px;
  font-size: 9px;
  text-transform: uppercase;
  position: sticky;
  top: 0;
  z-index: 1;
  border-bottom: 1px solid var(--border);
}

.result-table td {
  padding: 6px 8px;
  text-align: center;
  border-bottom: 1px solid rgba(255, 255, 255, 0.03);
}

.result-table tr:last-child td {
  border-bottom: none;
}

.row-correct {
  background: rgba(71, 255, 142, 0.03);
}

.row-wrong {
  background: rgba(255, 71, 87, 0.04);
}

.cell-letter {
  font-family: 'Bebas Neue', sans-serif;
  font-size: 16px;
  color: var(--text);
  white-space: nowrap;
}

.td-pressed {
  font-family: 'Bebas Neue', sans-serif;
  font-size: 15px;
}

.cell-correct {
  color: var(--correct);
}

.cell-wrong {
  color: var(--wrong);
}

.td-num {
  color: var(--muted);
  font-size: 10px;
}

.td-rt {
  color: var(--text);
  font-size: 11px;
  white-space: nowrap;
}

.td-bar {
  width: 72px;
  padding: 6px 10px;
}

.bar-wrap {
  height: 5px;
  background: var(--border);
  border-radius: 2px;
  overflow: hidden;
}

.bar-fill {
  height: 100%;
  background: var(--correct);
  border-radius: 2px;
}

.bar-fill.bar-zero {
  background: var(--wrong);
}

/* Result buttons */
.result-btns {
  display: flex;
  flex-direction: column;
  gap: 8px;
  width: 100%;
  margin-bottom: 36px;
}

.btn-retry {
  background: transparent;
  border: 1px solid var(--accent);
  color: var(--accent);
  font-family: 'Bebas Neue', sans-serif;
  font-size: 22px;
  letter-spacing: 4px;
  padding: 13px 40px;
  cursor: pointer;
  width: 100%;
  transition: all 0.15s;
}

.btn-retry:hover {
  background: var(--accent);
  color: var(--bg);
  box-shadow: 0 0 20px rgba(232, 255, 71, 0.2);
}

.btn-retry.btn-sub {
  border-color: var(--border);
  color: var(--muted);
  font-size: 16px;
}

.btn-retry.btn-sub:hover {
  background: var(--surface);
  color: var(--text);
  box-shadow: none;
}

@media (max-width: 400px) {
  .choice-btn {
    font-size: 40px;
    padding: 16px 6px;
  }

  .current-letter {
    font-size: 110px;
  }
}