/* VocaBoost — Dark Theme */
:root {
  --bg: #1a1a2e;
  --card: #16213e;
  --card-hover: #1a2745;
  --accent: #e94560;
  --accent-hover: #ff6b81;
  --secondary: #0f3460;
  --success: #00b894;
  --danger: #ff6b6b;
  --warning: #feca57;
  --text: #eee;
  --text-dim: #8892b0;
  --radius: 12px;
  --shadow: 0 4px 20px rgba(0,0,0,0.3);
}

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

html { height: 100%; overflow: hidden; }

body {
  font-family: system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  height: 100%;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  line-height: 1.6;
}

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-hover); }

.container { max-width: 800px; margin: 0 auto; padding: 20px; }

/* Navigation */
.nav {
  background: var(--card);
  padding: 15px 30px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid rgba(255,255,255,0.05);
  position: sticky;
  top: 0;
  z-index: 100;
}
.nav-logo { font-size: 1.4rem; font-weight: 700; }
.nav-links { display: flex; gap: 20px; align-items: center; }
.nav-links a { color: var(--text-dim); font-size: 0.9rem; }
.nav-links a:hover { color: var(--text); }
.nav-user { color: var(--accent); font-weight: 600; }

/* Cards */
.card {
  background: var(--card);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
  border: 1px solid rgba(255,255,255,0.05);
  transition: transform 0.2s, box-shadow 0.2s;
}
.card:hover { transform: translateY(-2px); box-shadow: 0 8px 30px rgba(0,0,0,0.4); }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;  /* min-width 있는 버튼 텍스트 중앙 정렬 */
  gap: 8px;
  padding: 12px 24px;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  color: white;
}
.btn-primary { background: var(--accent); }
.btn-primary:hover { background: var(--accent-hover); transform: scale(1.02); }
.btn-success { background: var(--success); }
.btn-success:hover { background: #00d2a0; }
.btn-danger { background: var(--danger); }
.btn-outline {
  background: transparent;
  border: 2px solid var(--accent);
  color: var(--accent);
}
.btn-outline:hover { background: var(--accent); color: white; }
.btn-sm { padding: 8px 16px; font-size: 0.85rem; min-width: 96px; min-height: 38px; line-height: 1.2; }
.btn-lg { padding: 16px 32px; font-size: 1.1rem; }
.btn-block { width: 100%; justify-content: center; }

/* Forms */
.form-group { margin-bottom: 16px; }
.form-group label { display: block; margin-bottom: 6px; color: var(--text-dim); font-size: 0.9rem; }
.form-input {
  width: 100%;
  padding: 12px 16px;
  background: var(--bg);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 8px;
  color: var(--text);
  font-size: 1rem;
  transition: border-color 0.2s;
}
.form-input:focus { outline: none; border-color: var(--accent); }
.form-error { color: var(--danger); font-size: 0.85rem; margin-top: 4px; }
.error-msg { background: rgba(255,107,107,0.1); border: 1px solid var(--danger); padding: 12px; border-radius: 8px; margin-bottom: 16px; }

/* Stats Grid */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin: 24px 0;
}
.stat-card {
  background: var(--card);
  border-radius: var(--radius);
  padding: 20px;
  text-align: center;
  border: 1px solid rgba(255,255,255,0.05);
}
.stat-icon { font-size: 2rem; margin-bottom: 8px; }
.stat-value { font-size: 2rem; font-weight: 700; color: var(--accent); }
.stat-label { font-size: 0.85rem; color: var(--text-dim); margin-top: 4px; }

/* Level Badge */
.level-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 600;
}
.level-1 { background: rgba(0,184,148,0.2); color: #00b894; }
.level-2 { background: rgba(0,206,209,0.2); color: #00ced1; }
.level-3 { background: rgba(85,239,196,0.2); color: #55efc4; }
.level-4 { background: rgba(129,236,236,0.2); color: #81ecec; }
.level-5 { background: rgba(254,202,87,0.2); color: #feca57; }
.level-6 { background: rgba(253,203,110,0.2); color: #fdcb6e; }
.level-7 { background: rgba(255,159,67,0.2); color: #ff9f43; }
.level-8 { background: rgba(225,112,85,0.2); color: #e17055; }
.level-9 { background: rgba(233,69,96,0.2); color: #e94560; }
.level-10 { background: rgba(214,48,49,0.2); color: #d63031; }

/* Word Card (flashcard) */
.word-card-container { perspective: 1000px; margin: 20px 0; }
.word-card {
  background: var(--card);
  border-radius: var(--radius);
  padding: 40px;
  text-align: center;
  cursor: pointer;
  transition: transform 0.6s;
  transform-style: preserve-3d;
  min-height: 250px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  border: 2px solid rgba(255,255,255,0.05);
  position: relative;
}
.word-card.flipped { transform: rotateY(180deg); }
.word-card-front, .word-card-back {
  backface-visibility: hidden;
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 40px;
}
.word-card-back { transform: rotateY(180deg); }
.word-english { font-size: 2.2rem; font-weight: 700; margin-bottom: 8px; }
.word-phonetic { font-family: monospace; color: var(--text-dim); font-size: 1rem; }
.word-korean { font-size: 1.8rem; font-weight: 600; color: var(--accent); margin-bottom: 12px; }
.word-example { font-size: 0.95rem; color: var(--text-dim); line-height: 1.5; }

/* Quiz Options */
.quiz-options { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin: 20px 0; }
.quiz-option {
  background: var(--card);
  border: 2px solid rgba(255,255,255,0.1);
  border-radius: 10px;
  padding: 16px;
  text-align: center;
  cursor: pointer;
  font-size: 1rem;
  transition: all 0.2s;
  color: var(--text);
}
.quiz-option:hover { border-color: var(--accent); background: var(--card-hover); }
.quiz-option.correct { border-color: var(--success); background: rgba(0,184,148,0.15); }
.quiz-option.wrong { border-color: var(--danger); background: rgba(255,107,107,0.15); }
.quiz-option.disabled { pointer-events: none; opacity: 0.7; }

/* Progress Bar */
.progress-bar {
  height: 6px;
  background: rgba(255,255,255,0.1);
  border-radius: 3px;
  overflow: hidden;
  margin: 16px 0;
}
.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent-hover));
  border-radius: 3px;
  transition: width 0.5s ease;
}

/* Streak */
.streak-display {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 1.2rem;
  font-weight: 600;
}

/* Quiz Score */
.score-display {
  font-size: 1.5rem;
  font-weight: 700;
  text-align: center;
  margin: 16px 0;
}
.score-correct { color: var(--success); }
.score-wrong { color: var(--danger); }

/* Toast Notification */
.toast {
  position: fixed;
  bottom: 30px;
  right: 30px;
  padding: 14px 24px;
  border-radius: 10px;
  font-weight: 600;
  z-index: 9999;
  animation: slideUp 0.3s ease, fadeOut 0.3s ease 2s forwards;
}
.toast-success { background: var(--success); color: white; }
.toast-error { background: var(--danger); color: white; }

/* Hero */
.hero { text-align: center; padding: 60px 20px; }
.hero h1 { font-size: 3rem; margin-bottom: 16px; }
.hero h1 span { color: var(--accent); }
.hero p { font-size: 1.2rem; color: var(--text-dim); margin-bottom: 32px; }
.hero-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

/* Feature Cards */
.features { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin: 40px 0; }
.feature-card { text-align: center; padding: 30px 20px; }
.feature-icon { font-size: 2.5rem; margin-bottom: 12px; }
.feature-title { font-size: 1.1rem; font-weight: 600; margin-bottom: 8px; }
.feature-desc { color: var(--text-dim); font-size: 0.9rem; }

/* Actions */
.actions { display: flex; gap: 12px; justify-content: center; margin: 20px 0; flex-wrap: wrap; }

/* Level Result */
.level-result {
  text-align: center;
  padding: 40px;
  animation: scaleIn 0.5s ease;
}
.level-result .level-number { font-size: 5rem; font-weight: 800; color: var(--accent); }
.level-result .level-text { font-size: 1.3rem; color: var(--text-dim); margin-top: 8px; }

/* Empty State */
.empty-state { text-align: center; padding: 60px 20px; color: var(--text-dim); }
.empty-state .icon { font-size: 3rem; margin-bottom: 16px; }

/* Counter */
.counter { text-align: center; color: var(--text-dim); font-size: 0.9rem; margin: 12px 0; }

/* Animations */
@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-8px); }
  40% { transform: translateX(8px); }
  60% { transform: translateX(-5px); }
  80% { transform: translateX(5px); }
}
.blank-shake { animation: shake 0.4s ease; }

@keyframes slideUp {
  from { transform: translateY(30px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}
@keyframes fadeOut {
  to { opacity: 0; transform: translateY(-10px); }
}
@keyframes scaleIn {
  from { transform: scale(0.5); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}
.fade-in { animation: slideUp 0.4s ease; }

/* Sentence display */
.sentence-display {
  font-size: 1.4rem;
  line-height: 1.8;
  text-align: center;
  min-height: 100px;
}
.blank-word {
  display: inline-block;
  min-width: 80px;
  padding: 4px 12px;
  border-bottom: 3px solid var(--accent);
  color: var(--accent);
  font-weight: 700;
  letter-spacing: 2px;
  transition: color 0.3s, border-color 0.3s;
}
.blank-active {
  border-color: var(--warning);
  background: rgba(254,202,87,0.1);
  border-radius: 4px;
}
.blank-correct {
  color: var(--success);
  border-color: var(--success);
  background: rgba(0,184,148,0.1);
  border-radius: 4px;
}
.blank-wrong {
  color: var(--danger);
  border-color: var(--danger);
  background: rgba(255,107,107,0.1);
  border-radius: 4px;
}

/* Typing area — input 위 / 확인 버튼 아래 가운데 정렬 (전체 버튼 중앙 통일) */
.typing-area {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  max-width: 500px;
  margin: 0 auto;
}
.typing-input {
  width: 100%;
  font-size: 1.1rem;
  text-align: center;
  letter-spacing: 1px;
}
.typing-area #submit-btn {
  min-width: 140px;
  justify-content: center;
}
.input-correct { border-color: var(--success) !important; background: rgba(0,184,148,0.1) !important; }
.input-wrong { border-color: var(--danger) !important; background: rgba(255,107,107,0.1) !important; }

/* 다시듣기 / 다음 버튼 — 동일 너비로 좌우 균형 */
#replay-btn, #next-btn {
  min-width: 130px;
  justify-content: center;
}

/* Question level badge — 카드 우상단 (한글 뜻은 좌상단이라 겹치지 않음) */
.question-level {
  position: absolute;
  top: 12px;
  right: 16px;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 10px;
  opacity: 0.8;
  z-index: 1;
}
/* 한글 뜻이 길어 배지까지 뻗지 않도록 우측 패딩 확보 */
#learn-korean, #quiz-korean { padding-right: 56px; }

/* Hint */
.hint-text {
  font-size: 1rem;
  animation: slideUp 0.3s ease;
}

/* Answer meaning */
.answer-meaning-slot {
  min-height: 44px;
  margin-top: 10px;
  box-sizing: border-box;
}
.answer-meaning {
  display: block;
  min-height: 44px;
  box-sizing: border-box;
  text-align: center;
  padding: 10px 14px;
  background: rgba(233,69,96,0.1);
  border: 1px solid rgba(233,69,96,0.3);
  border-radius: 8px;
  font-size: 0.95rem;
  line-height: 1.35;
  color: var(--text);
  word-break: keep-all;
  overflow-wrap: anywhere;
}

/* TTS button */
.tts-btn {
  background: none;
  border: none;
  font-size: 1.3rem;
  cursor: pointer;
  opacity: 0.7;
  transition: opacity 0.2s;
  padding: 4px;
}
.tts-btn:hover { opacity: 1; }

/* Timer bar */
.timer-bar {
  height: 4px;
  background: var(--accent);
  border-radius: 2px;
  transition: width 0.1s linear;
}

/* Responsive */
@media (max-width: 600px) {
  .features { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: 1fr; }
  .quiz-options { grid-template-columns: 1fr; }
  .hero h1 { font-size: 2rem; }
  .nav { padding: 10px 12px; flex-wrap: wrap; gap: 8px; }
  .nav-links { gap: 10px; font-size: 0.8rem; flex-wrap: wrap; }
  .nav-logo { font-size: 1.1rem; }
  /* 모바일에선 username 생략 — Logout 잘림 방지 */
  .nav-user { display: none; }

  /* 모바일: 키보드 열려도 문제+해석 보이게 컴팩트 */
  #quiz-container > h2,
  #learn-container > h2,
  #test-container > h2 { display: none; }
  #test-container > p { margin-bottom: 8px !important; }
  .container { padding: 10px 12px; }
  .progress-bar { margin: 6px 0; }
  .counter { margin: 4px 0; font-size: 0.8rem; }
  #quiz-container .card,
  #learn-container .card,
  #test-container .card {
    padding: 16px !important;
    margin: 6px 0 !important;
  }
  .sentence-display { font-size: 1.1rem; line-height: 1.6; }
  /* 모바일에서도 배지는 카드 우상단 고정 — 문장 속에 섞이면 가독성 나쁨 */
  .question-level {
    top: 8px;
    right: 12px;
    font-size: 0.7rem;
    padding: 2px 6px;
  }
  .toast { display: none; }
  .inline-toast {
    position: absolute;
    top: -44px;
    left: 50%;
    transform: translateX(-50%);
    max-width: 90vw;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    text-align: center;
    padding: 8px 16px;
    border-radius: 8px;
    font-weight: 600;
    font-size: 0.9rem;
    z-index: 10;
    box-shadow: 0 4px 12px rgba(0,0,0,0.3);
    animation: slideUp 0.2s ease;
  }
  .answer-area { margin-top: 4px; position: relative; }
  .typing-area { gap: 8px; }
  .typing-input { padding: 10px 12px !important; font-size: 1rem; }
}

/* 가상 자판 — 모바일에서 OS 자판 대체 */
.vkbd {
  max-width: 520px;
  margin: 14px auto 0;
  user-select: none;
  -webkit-user-select: none;
}
/* 20열 grid — key=2col, half spacer=1col, 1.5 key=3col. 모든 row 총 20col로 계단 오프셋 정확 */
.vkbd-row {
  display: grid;
  grid-template-columns: repeat(20, 1fr);
  gap: 4px;
  margin: 4px 0;
}
.vkbd-key {
  grid-column: span 2;
  min-width: 0;
  height: 44px;
  border: none;
  border-radius: 6px;
  background: var(--card);
  color: var(--text);
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  touch-action: manipulation;
  padding: 0;
}
.vkbd-key:active { background: var(--accent); color: white; transform: scale(0.95); }
.vkbd-key.vkbd-wide { grid-column: span 3; font-size: 0.75rem; padding: 0 6px; }
.vkbd-spacer { pointer-events: none; }
.vkbd-spacer-half { grid-column: span 1; }
.vkbd-spacer-onehalf { grid-column: span 3; }
.vkbd-bottom { gap: 8px; margin-top: 6px; }
.vkbd-bottom-key { grid-column: span 10; height: 48px; font-size: 0.95rem; }
.vkbd-enter { background: var(--success); color: white; }
.vkbd-back { background: var(--danger); color: white; }

/* 데스크탑(물리 키보드 있는 환경)에서는 가상 자판 숨김 */
@media (hover: hover) and (pointer: fine) {
  .vkbd { display: none; }
}

/* 확인 버튼 불필요 — 모바일은 vkbd Enter, PC는 물리 Enter가 대체 */
#submit-btn { display: none !important; }
@media (hover: none) and (pointer: coarse) {
  #chunk-submit { display: none !important; }
}

/* PC에서만 키 단축키 가이드 — answer-area 맨 아래 (힌트/다음 버튼 다음) */
@media (hover: hover) and (pointer: fine) {
  .answer-area::after {
    content: "⇥ Tab 힌트  ·  ↵ Enter 확인";
    display: block;
    text-align: center;
    color: var(--text-dim);
    font-size: 0.75rem;
    margin-top: 20px;
    letter-spacing: 0.02em;
    opacity: 0.6;
  }
}

/* Wordle 전용 키패드 — 20col grid, 표준 QWERTY 계단 오프셋 */
.wkbd-row { display: grid; grid-template-columns: repeat(20, 1fr); gap: 4px; margin: 4px 0; }
.wkbd-key {
  grid-column: span 2;
  min-width: 0;
  height: 40px;
  border: none;
  border-radius: 6px;
  background: var(--card);
  color: var(--text);
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  padding: 0;
  touch-action: manipulation;
}
.wkbd-key:active { transform: scale(0.95); }
.wkbd-spacer-half { grid-column: span 1; pointer-events: none; }
.wkbd-spacer-onehalf { grid-column: span 3; pointer-events: none; }
.wkbd-key.wkbd-enter { grid-column: span 3; background: var(--success); color: white; font-weight: 700; font-size: 0.75rem; }
.wkbd-key.wkbd-back { grid-column: span 3; background: var(--danger); color: white; font-size: 0.8rem; }
.wkbd-key.wkbd-space { grid-column: span 14; font-size: 0.85rem; }
.wkbd-key.wkbd-enter-wide { grid-column: span 6; background: var(--success); color: white; font-weight: 700; font-size: 0.8rem; }