/* ============================================================
   style.css — 타자 연습 게임 스타일시트
   ============================================================ */

/* ---------- CSS 변수 ---------- */
:root {
  --color-bg: #0f1117;
  --color-surface: #1a1d27;
  --color-surface-2: #222536;
  --color-border: #2d3148;
  --color-primary: #6c63ff;
  --color-primary-hover: #5a52e0;
  --color-success: #4caf82;
  --color-error: #e05a6e;
  --color-warning: #f0a500;
  --color-text: #e8eaf0;
  --color-text-muted: #8b8fa8;
  --color-premium: #f5c842;
  --color-ad-bg: #1e2130;
  --color-ad-border: #2a3050;
  --radius: 12px;
  --radius-sm: 8px;
  --transition: 0.2s ease;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
}

/* ---------- 전체 리셋 ---------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: 'Segoe UI', 'Apple SD Gothic Neo', 'Noto Sans KR', sans-serif;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
}

/* ---------- 광고 배너 ---------- */
.ad-banner {
  width: 100%;
  background-color: var(--color-ad-bg);
  border: 1px dashed var(--color-ad-border);
  text-align: center;
  padding: 12px 16px;
  color: var(--color-text-muted);
  font-size: 0.85rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: opacity var(--transition);
}

.ad-banner.ad-top {
  border-top: none;
  border-left: none;
  border-right: none;
  border-bottom: 1px dashed var(--color-ad-border);
}

.ad-banner.ad-bottom {
  border-bottom: none;
  border-left: none;
  border-right: none;
  border-top: 1px dashed var(--color-ad-border);
  margin-top: auto;
}

.ad-label {
  background-color: var(--color-error);
  color: #fff;
  font-size: 0.7rem;
  font-weight: 700;
  padding: 2px 6px;
  border-radius: 4px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.ad-banner.hidden {
  display: none;
}

/* ---------- 메인 컨테이너 ---------- */
.container {
  width: 100%;
  max-width: 680px;
  padding: 32px 20px 48px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 28px;
  flex: 1;
}

/* ---------- 헤더 ---------- */
.header {
  text-align: center;
  position: relative;
}

.title {
  font-size: 2.2rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  background: linear-gradient(135deg, #a78bff 0%, #6c63ff 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
}

.subtitle {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  margin-top: 6px;
}

.premium-badge {
  display: inline-block;
  background: linear-gradient(135deg, #f5c842, #e09b00);
  color: #1a1400;
  font-size: 0.72rem;
  font-weight: 800;
  padding: 3px 10px;
  border-radius: 20px;
  letter-spacing: 0.1em;
  margin-bottom: 8px;
  text-transform: uppercase;
  box-shadow: 0 2px 8px rgba(245, 200, 66, 0.4);
}

/* ---------- 점수판 ---------- */
.scoreboard {
  display: flex;
  gap: 12px;
  width: 100%;
}

.score-item {
  flex: 1;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 16px 12px;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.score-label {
  font-size: 0.78rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: 600;
}

.score-value {
  font-size: 2rem;
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1;
  font-variant-numeric: tabular-nums;
}

.score-value.danger {
  color: var(--color-error);
  animation: pulse 0.8s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

/* ---------- 난이도 선택 ---------- */
.difficulty-section {
  width: 100%;
  text-align: center;
}

.difficulty-label {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-bottom: 10px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: 600;
}

.difficulty-buttons {
  display: flex;
  gap: 8px;
  justify-content: center;
}

.diff-btn {
  padding: 8px 20px;
  border: 2px solid var(--color-border);
  border-radius: 50px;
  background-color: transparent;
  color: var(--color-text-muted);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  font-family: inherit;
}

.diff-btn:hover:not(:disabled) {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.diff-btn.active {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
  color: #fff;
}

.diff-btn.premium-locked {
  opacity: 0.45;
  cursor: not-allowed;
  border-style: dashed;
}

.diff-btn.premium-locked.unlocked {
  opacity: 1;
  cursor: pointer;
  border-style: solid;
  border-color: var(--color-premium);
  color: var(--color-premium);
}

.diff-btn.premium-locked.unlocked.active {
  background-color: var(--color-premium);
  color: #1a1400;
}

/* ---------- 게임 영역 ---------- */
.game-area {
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
}

.word-display {
  width: 100%;
  background-color: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius);
  padding: 40px 24px;
  text-align: center;
  min-height: 130px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: border-color var(--transition);
}

#currentWord {
  font-size: 2.8rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  color: var(--color-text);
  word-break: break-all;
  line-height: 1.2;
}

.word-input {
  width: 100%;
  padding: 16px 20px;
  font-size: 1.2rem;
  font-family: inherit;
  background-color: var(--color-surface-2);
  border: 2px solid var(--color-border);
  border-radius: var(--radius);
  color: var(--color-text);
  outline: none;
  transition: border-color var(--transition);
  text-align: center;
}

.word-input::placeholder {
  color: var(--color-text-muted);
}

.word-input:focus {
  border-color: var(--color-primary);
}

.word-input:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.feedback {
  font-size: 1rem;
  font-weight: 600;
  min-height: 24px;
  transition: opacity var(--transition);
}

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

.feedback.wrong {
  color: var(--color-error);
}

/* ---------- 버튼 ---------- */
.action-buttons {
  display: flex;
  gap: 12px;
  justify-content: center;
}

.btn-start {
  padding: 14px 40px;
  background: linear-gradient(135deg, #6c63ff, #5a52e0);
  color: #fff;
  border: none;
  border-radius: 50px;
  font-size: 1.05rem;
  font-weight: 700;
  cursor: pointer;
  font-family: inherit;
  transition: transform var(--transition), box-shadow var(--transition);
  box-shadow: 0 4px 16px rgba(108, 99, 255, 0.45);
}

.btn-start:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(108, 99, 255, 0.6);
}

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

/* ---------- 게임 종료 화면 ---------- */
.game-over-screen {
  width: 100%;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 36px 28px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  box-shadow: var(--shadow);
}

.game-over-screen h2 {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--color-text);
}

.final-score-text {
  font-size: 1.1rem;
  color: var(--color-text-muted);
}

.final-score-text strong {
  color: var(--color-primary);
  font-size: 2rem;
}

.high-score-text {
  font-size: 0.95rem;
  color: var(--color-warning);
  font-weight: 600;
}

/* ---------- 프리미엄 전용 통계 ---------- */
.premium-stats {
  width: 100%;
  background-color: var(--color-surface-2);
  border: 1px solid var(--color-premium);
  border-radius: var(--radius-sm);
  padding: 20px;
  margin-top: 8px;
}

.premium-stats h3 {
  font-size: 1rem;
  color: var(--color-premium);
  font-weight: 700;
  margin-bottom: 16px;
}

.stats-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.stat-item {
  background-color: var(--color-surface);
  border-radius: var(--radius-sm);
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.stat-label {
  font-size: 0.78rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.stat-value {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--color-premium);
}

/* ---------- 프리미엄 업그레이드 카드 ---------- */
.premium-section {
  width: 100%;
}

.premium-card {
  background: linear-gradient(135deg, #1a1d2e, #1e2038);
  border: 1px solid #3d3570;
  border-radius: var(--radius);
  padding: 28px 24px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
}

.premium-card h3 {
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--color-premium);
}

.premium-features {
  list-style: none;
  text-align: left;
  display: flex;
  flex-direction: column;
  gap: 8px;
  width: 100%;
  max-width: 280px;
}

.premium-features li {
  font-size: 0.95rem;
  color: var(--color-text);
}

.premium-price {
  font-size: 1.3rem;
  font-weight: 800;
  color: #fff;
  background: rgba(108, 99, 255, 0.2);
  border: 1px solid rgba(108, 99, 255, 0.4);
  padding: 6px 20px;
  border-radius: 50px;
}

.btn-premium {
  padding: 14px 36px;
  background: linear-gradient(135deg, #f5c842, #e09b00);
  color: #1a1400;
  border: none;
  border-radius: 50px;
  font-size: 1rem;
  font-weight: 800;
  cursor: pointer;
  font-family: inherit;
  transition: transform var(--transition), box-shadow var(--transition);
  box-shadow: 0 4px 16px rgba(245, 200, 66, 0.4);
  width: 100%;
  max-width: 300px;
}

.btn-premium:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(245, 200, 66, 0.6);
}

.btn-demo {
  background: transparent;
  border: 1px dashed var(--color-border);
  color: var(--color-text-muted);
  padding: 6px 16px;
  border-radius: 50px;
  font-size: 0.78rem;
  cursor: pointer;
  font-family: inherit;
  transition: all var(--transition);
}

.btn-demo:hover {
  border-color: var(--color-text-muted);
  color: var(--color-text);
}

/* ---------- 커스텀 단어 업로드 ---------- */
.custom-words-section {
  width: 100%;
  background-color: var(--color-surface);
  border: 1px solid var(--color-premium);
  border-radius: var(--radius);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.custom-words-section h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-premium);
}

.upload-hint {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.custom-words-input {
  width: 100%;
  background-color: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text);
  padding: 12px 14px;
  font-size: 0.9rem;
  font-family: 'Courier New', monospace;
  resize: vertical;
  outline: none;
  transition: border-color var(--transition);
}

.custom-words-input:focus {
  border-color: var(--color-premium);
}

.upload-actions {
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
}

.file-input {
  display: none;
}

.btn-upload {
  padding: 8px 18px;
  background-color: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text);
  font-size: 0.88rem;
  cursor: pointer;
  transition: all var(--transition);
  font-family: inherit;
}

.btn-upload:hover {
  border-color: var(--color-premium);
  color: var(--color-premium);
}

.btn-apply {
  padding: 8px 18px;
  background-color: var(--color-premium);
  color: #1a1400;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  font-weight: 700;
  cursor: pointer;
  font-family: inherit;
  transition: opacity var(--transition);
}

.btn-apply:hover {
  opacity: 0.85;
}

.upload-status {
  font-size: 0.85rem;
  color: var(--color-success);
  min-height: 18px;
}

/* ---------- 공통 유틸 ---------- */
.hidden {
  display: none !important;
}

/* ---------- 반응형 (모바일) ---------- */
@media (max-width: 480px) {
  .container {
    padding: 20px 14px 36px;
    gap: 20px;
  }

  .title {
    font-size: 1.7rem;
  }

  .scoreboard {
    gap: 8px;
  }

  .score-item {
    padding: 12px 8px;
  }

  .score-value {
    font-size: 1.5rem;
  }

  .score-label {
    font-size: 0.68rem;
  }

  #currentWord {
    font-size: 2rem;
  }

  .word-display {
    padding: 28px 16px;
    min-height: 100px;
  }

  .difficulty-buttons {
    flex-wrap: wrap;
  }

  .diff-btn {
    padding: 7px 16px;
    font-size: 0.85rem;
  }

  .stats-grid {
    gap: 8px;
  }

  .btn-start {
    padding: 12px 30px;
    font-size: 0.95rem;
  }

  .premium-card {
    padding: 20px 16px;
  }
}

/* ---------- 애니메이션 ---------- */

/* 단어 등장 */
@keyframes wordIn {
  from { opacity: 0; transform: translateY(-10px); }
  to   { opacity: 1; transform: translateY(0); }
}

.word-anim {
  animation: wordIn 0.22s ease forwards;
}

/* 정답 반짝임 */
@keyframes flashGreen {
  0%   { background-color: rgba(76, 175, 130, 0.18); }
  100% { background-color: transparent; }
}

.flash-correct {
  animation: flashGreen 0.35s ease forwards;
}

/* 오답 흔들림 */
@keyframes shakeRed {
  0%, 100% { transform: translateX(0); }
  25%       { transform: translateX(-6px); }
  75%       { transform: translateX(6px); }
}

.shake-wrong {
  animation: shakeRed 0.3s ease;
}