/* ===== Derivatives Sense — 공통 스타일 ===== */
* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --bg: #f0f4ff;
  --primary: #1d4ed8;       /* 금융 블루 */
  --primary-light: #3b82f6;
  --primary-dark: #1e3a8a;
  --accent: #f59e0b;
  --accent-dark: #d97706;

  /* 손익 컬러 */
  --profit: #16a34a;        /* 이익 / 롱 / 정답 */
  --profit-light: #dcfce7;
  --profit-dark: #15803d;
  --loss: #dc2626;          /* 손실 / 숏 / 오답 */
  --loss-light: #fee2e2;
  --loss-dark: #b91c1c;
  --neutral: #6b7280;       /* 0선 */

  --success: var(--profit);
  --success-dark: var(--profit-dark);
  --error: var(--loss);

  --text: #1e293b;
  --text-light: #64748b;
  --border: #e2e8f0;
  --card: #ffffff;
  --radius: 16px;
  --radius-sm: 8px;
  --touch: 48px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 14px;
  padding-top: max(14px, env(safe-area-inset-top));
  padding-bottom: max(14px, env(safe-area-inset-bottom));
  -webkit-tap-highlight-color: transparent;
  user-select: none;
}

.container {
  width: 100%;
  max-width: 600px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

/* ===== SCREEN SYSTEM ===== */
.screen { display: none; }
.screen.active { display: flex; flex-direction: column; gap: 14px; animation: fadeIn 0.2s ease-out; }

/* ===== TYPOGRAPHY ===== */
.page-title {
  font-size: clamp(20px, 5vw, 26px);
  font-weight: 800;
  text-align: center;
  color: var(--primary);
  line-height: 1.2;
}
.page-subtitle {
  font-size: 14px;
  text-align: center;
  color: var(--text-light);
  line-height: 1.5;
}
.instruction {
  font-size: 15px;
  text-align: center;
  color: var(--text-light);
  font-weight: 500;
  min-height: 22px;
  line-height: 1.5;
}

/* ===== GAME HEADER ===== */
.game-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  min-height: var(--touch);
}
.back-btn {
  background: none;
  border: none;
  font-size: 22px;
  cursor: pointer;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  color: var(--text-light);
  min-width: var(--touch);
  min-height: var(--touch);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s;
}
.back-btn:active { background: var(--border); }
.round-info { font-size: 13px; color: var(--text-light); font-weight: 600; }
.score-display { font-size: 13px; font-weight: 700; color: var(--primary); min-width: 60px; text-align: right; }

/* ===== HISTORY BAR ===== */
.history-bar {
  display: flex;
  gap: 4px;
  justify-content: center;
  flex-wrap: wrap;
}
.history-dot {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  border: 2px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 8px;
  font-weight: 700;
  color: var(--text-light);
  transition: all 0.2s;
}
.history-dot.current  { border-color: var(--primary); background: var(--primary-light); color: white; }
.history-dot.done3    { background: var(--profit); border-color: var(--profit-dark); color: white; font-size: 7px; }
.history-dot.done2    { background: var(--accent); border-color: var(--accent-dark); color: var(--text); font-size: 7px; }
.history-dot.done1    { background: var(--loss); border-color: var(--loss-dark); color: white; font-size: 7px; }

/* ===== MODE CARDS (index) ===== */
.mode-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}
@media (max-width: 380px) { .mode-grid { grid-template-columns: 1fr; } }

.mode-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 16px 10px;
  background: var(--card);
  border: 2px solid transparent;
  border-radius: var(--radius);
  cursor: pointer;
  transition: all 0.2s;
  box-shadow: 0 2px 8px rgba(0,0,0,0.06);
  text-decoration: none;
  color: var(--text);
  min-height: 96px;
  justify-content: center;
}
.mode-card:hover, .mode-card:active {
  border-color: var(--primary);
  transform: scale(1.03);
  box-shadow: 0 4px 16px rgba(29,78,216,0.15);
}
.mode-card.disabled {
  opacity: 0.45;
  cursor: not-allowed;
  pointer-events: none;
}
.mode-icon { font-size: 32px; }
.mode-title { font-size: 13px; font-weight: 700; text-align: center; }
.mode-desc  { font-size: 11px; color: var(--text-light); text-align: center; line-height: 1.4; }
.mode-badge {
  font-size: 10px;
  font-weight: 700;
  background: var(--border);
  color: var(--text-light);
  border-radius: 99px;
  padding: 1px 7px;
}

/* ===== LEVEL BUTTONS ===== */
.level-list { display: flex; flex-direction: column; gap: 8px; }
.level-btn {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 18px;
  background: var(--card);
  border: 2px solid transparent;
  border-radius: var(--radius);
  cursor: pointer;
  transition: all 0.15s;
  box-shadow: 0 2px 8px rgba(0,0,0,0.06);
  min-height: var(--touch);
}
.level-btn:hover, .level-btn:active { border-color: var(--primary); transform: translateX(4px); }
.level-icon { font-size: 24px; min-width: 36px; text-align: center; }
.level-info h3 { font-size: 15px; font-weight: 700; margin-bottom: 2px; }
.level-info p  { font-size: 12px; color: var(--text-light); }

/* ===== CARD ===== */
.card {
  background: var(--card);
  border-radius: var(--radius);
  padding: 16px;
  box-shadow: 0 2px 12px rgba(0,0,0,0.06);
}

/* ===== QUESTION CARD ===== */
.question-card {
  background: var(--card);
  border-radius: var(--radius);
  padding: 18px 16px;
  box-shadow: 0 2px 12px rgba(0,0,0,0.06);
}
.question-badge {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  background: #dbeafe;
  color: var(--primary);
  border-radius: 99px;
  padding: 2px 10px;
  margin-bottom: 8px;
}
.question-text {
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
  line-height: 1.6;
}
.question-params {
  margin-top: 8px;
  font-size: 13px;
  color: var(--text-light);
  background: var(--bg);
  border-radius: var(--radius-sm);
  padding: 8px 12px;
  font-family: 'SF Mono', 'Consolas', monospace;
}

/* ===== PAYOFF CHART GRID (4-choice) ===== */
.payoff-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}
@media (max-width: 360px) { .payoff-grid { grid-template-columns: 1fr; } }

.payoff-choice {
  position: relative;
  background: var(--card);
  border: 2.5px solid var(--border);
  border-radius: var(--radius);
  padding: 8px;
  cursor: pointer;
  transition: all 0.18s;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  box-shadow: 0 1px 4px rgba(0,0,0,0.06);
}
.payoff-choice:active { transform: scale(0.97); }
.payoff-choice.selected    { border-color: var(--primary); background: #eff6ff; }
.payoff-choice.correct     { border-color: var(--profit); background: var(--profit-light); }
.payoff-choice.wrong       { border-color: var(--loss);   background: var(--loss-light); opacity: 0.7; }
.payoff-choice.highlight   { border-color: var(--profit); background: var(--profit-light); box-shadow: 0 0 0 3px rgba(22,163,74,0.25); }
.payoff-choice.disabled    { pointer-events: none; }

.payoff-choice canvas      { display: block; border-radius: 4px; }
.payoff-choice .choice-label {
  font-size: 11px;
  font-weight: 700;
  color: var(--text-light);
  text-align: center;
}

/* ===== FEEDBACK ===== */
.feedback {
  text-align: center;
  padding: 12px;
  border-radius: var(--radius);
  display: none;
  background: var(--card);
  box-shadow: 0 2px 8px rgba(0,0,0,0.06);
}
.feedback.show   { display: block; animation: slideIn 0.3s ease-out; }
.feedback-stars  { font-size: 24px; margin-bottom: 4px; }
.feedback-message{ font-size: 16px; font-weight: 700; margin-bottom: 4px; }
.feedback-detail { font-size: 13px; color: var(--text-light); line-height: 1.5; }
.feedback-formula{
  margin-top: 8px;
  font-size: 12px;
  background: var(--bg);
  border-radius: var(--radius-sm);
  padding: 8px 12px;
  color: var(--text);
  font-family: 'SF Mono', 'Consolas', monospace;
  text-align: left;
  white-space: pre-wrap;
  word-break: break-all;
}

/* ===== BUTTONS ===== */
.next-btn {
  padding: 13px;
  background: var(--primary);
  color: white;
  border: none;
  border-radius: var(--radius);
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.15s;
  display: none;
  min-height: var(--touch);
}
.next-btn.show   { display: block; }
.next-btn:active { transform: scale(0.97); background: var(--primary-dark); }

/* ===== RESULT SCREEN ===== */
.result-card {
  background: var(--card);
  border-radius: var(--radius);
  padding: 20px 16px;
  text-align: center;
  box-shadow: 0 2px 12px rgba(0,0,0,0.06);
}
.result-label  { font-size: 13px; color: var(--text-light); margin-bottom: 4px; }
.result-score  { font-size: 40px; font-weight: 900; color: var(--primary); line-height: 1; margin-bottom: 4px; }
.result-stars  { font-size: 28px; margin-bottom: 4px; }
.result-message{ font-size: 18px; font-weight: 700; margin-bottom: 4px; }
.result-detail { font-size: 13px; color: var(--text-light); line-height: 1.5; }
.result-rounds { margin-top: 14px; display: flex; flex-wrap: wrap; justify-content: center; gap: 6px; }
.round-dot {
  width: 28px; height: 28px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 11px; font-weight: 700; color: white;
}
.round-dot.star3 { background: var(--profit); }
.round-dot.star2 { background: var(--accent); color: var(--text); }
.round-dot.star1 { background: var(--loss); }
.result-buttons { display: flex; gap: 10px; }
.result-buttons button {
  flex: 1; padding: 13px; border-radius: var(--radius);
  font-size: 14px; font-weight: 700; cursor: pointer;
  border: none; transition: all 0.15s; min-height: var(--touch);
}
.retry-btn       { background: var(--primary); color: white; }
.retry-btn:active{ background: var(--primary-dark); }
.home-btn        { background: var(--border); color: var(--text); }
.home-btn:active { background: #cbd5e1; }

/* ===== ONBOARDING OVERLAY ===== */
.onboarding-overlay {
  position: fixed; top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,0.55);
  display: flex; align-items: center; justify-content: center;
  z-index: 100; padding: 24px;
  animation: fadeIn 0.2s ease-out;
}
.onboarding-card {
  background: white; border-radius: 20px;
  padding: 24px 20px; max-width: 360px; width: 100%;
  text-align: center; box-shadow: 0 8px 32px rgba(0,0,0,0.2);
}
.onboarding-icon  { font-size: 42px; margin-bottom: 10px; }
.onboarding-title { font-size: 18px; font-weight: 800; color: var(--primary); margin-bottom: 8px; }
.onboarding-text  { font-size: 14px; color: var(--text); line-height: 1.65; margin-bottom: 16px; }
.onboarding-btn {
  padding: 13px; background: var(--primary); color: white;
  border: none; border-radius: var(--radius);
  font-size: 16px; font-weight: 700; cursor: pointer;
  width: 100%; min-height: var(--touch);
}
.onboarding-btn:active { background: var(--primary-dark); }

/* ===== PHASE TABS ===== */
.phase-tabs {
  display: flex;
  gap: 4px;
  background: var(--border);
  padding: 3px;
  border-radius: 12px;
}
.phase-tab {
  flex: 1;
  padding: 9px 4px;
  border: none;
  border-radius: 9px;
  background: transparent;
  font-size: 12px;
  font-weight: 700;
  color: var(--text-light);
  cursor: pointer;
  transition: all 0.2s;
  white-space: nowrap;
}
.phase-tab.active {
  background: white;
  color: var(--primary);
  box-shadow: 0 1px 4px rgba(0,0,0,0.1);
}
.phase-tab:active { transform: scale(0.97); }

.back-row {
  display: flex;
  align-items: center;
  gap: 8px;
  min-height: var(--touch);
}
.back-row .screen-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
}

/* ===== ANIMATIONS ===== */
@keyframes fadeIn  { from { opacity: 0; } to { opacity: 1; } }
@keyframes slideIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }
@keyframes popIn {
  0%   { transform: scale(0); }
  70%  { transform: scale(1.2); }
  100% { transform: scale(1); }
}
.pop-anim { animation: popIn 0.3s ease-out; }

/* ===== FOOTER ===== */
.footer-note {
  text-align: center;
  font-size: 11px;
  color: var(--text-light);
  padding: 2px 0 6px;
  line-height: 1.5;
}