/* battle-app - learning-app과 동일한 디자인 시스템 */
:root {
  --primary: #4F6BED;
  --primary-hover: #3D57D8;
  --primary-light: rgba(79, 107, 237, 0.10);
  --primary-border: rgba(79, 107, 237, 0.25);
  --success: #22C55E;
  --success-light: rgba(34, 197, 94, 0.10);
  --success-border: rgba(34, 197, 94, 0.30);
  --warning: #F59E0B;
  --warning-light: rgba(245, 158, 11, 0.10);
  --danger: #EF4444;
  --danger-light: rgba(239, 68, 68, 0.10);
  --danger-border: rgba(239, 68, 68, 0.30);
  --bg: #F0F2F8;
  --card: #FFFFFF;
  --text: #1E293B;
  --text-secondary: #64748B;
  --text-light: #94A3B8;
  --border: #E2E8F0;
  --input-bg: #F8FAFC;
  --shadow-xs: 0 1px 2px rgba(0,0,0,0.04);
  --shadow-sm: 0 1px 4px rgba(0,0,0,0.06);
  --shadow: 0 4px 16px rgba(0,0,0,0.07);
  --shadow-lg: 0 8px 28px rgba(0,0,0,0.10);
  --radius: 16px;
  --radius-sm: 10px;
  --radius-xs: 8px;
  --font-heading: 'Jua', sans-serif;
  --font-body: 'Noto Sans KR', system-ui, -apple-system, sans-serif;
}

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

html { scroll-behavior: smooth; }

body {
  min-height: 100vh;
  font-family: var(--font-body);
  background: linear-gradient(160deg, #e8ecf8 0%, #f0f2f8 30%, #f5f0f0 100%);
  color: var(--text);
  -webkit-tap-highlight-color: transparent;
}

#app { min-height: 100vh; }

.hidden { display: none !important; }

/* ── Splash ── */
.splash {
  position: fixed;
  inset: 0;
  background: #fff;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 9999;
}
.splash-logo { width: 180px; margin-bottom: 16px; animation: pulse 1.5s ease-in-out infinite; }
.splash-text { font-family: var(--font-heading); color: var(--text-secondary); font-size: 15px; }
@keyframes pulse {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.04); opacity: 0.85; }
}

/* ── Views ── */
.view { max-width: 680px; margin: 0 auto; padding: 16px; }
.view-center {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 20px;
}

/* ── Login ── */
.login-card {
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  padding: 44px 32px 36px;
  width: 100%;
  max-width: 400px;
  text-align: center;
}
.login-logo { width: 160px; margin-bottom: 12px; }
.login-title {
  font-family: var(--font-heading);
  font-size: 26px;
  color: var(--primary);
  margin-bottom: 8px;
}
.login-sub { font-size: 14px; color: var(--text-secondary); margin-bottom: 24px; }
.form-group { margin-bottom: 12px; }
.form-group label {
  display: block;
  font-size: 12px;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 5px;
}
.form-group input,
.form-group select {
  width: 100%;
  padding: 12px 14px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--input-bg);
  color: var(--text);
  font-size: 15px;
  font-family: var(--font-body);
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.form-group input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-light);
}
.form-group input::placeholder { color: var(--text-light); }

.btn-primary {
  display: block;
  width: 100%;
  padding: 13px;
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-family: var(--font-heading);
  cursor: pointer;
  transition: background 0.2s, transform 0.08s;
}
.btn-primary:hover { background: var(--primary-hover); }
.btn-primary:active { transform: translateY(1px); }
.btn-primary:disabled { opacity: 0.55; cursor: not-allowed; }
.btn-lg { padding: 15px; font-size: 17px; }

.btn-outline {
  padding: 7px 12px;
  background: transparent;
  color: var(--text-secondary);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-xs);
  font-size: 13px;
  font-family: var(--font-body);
  cursor: pointer;
  transition: all 0.2s;
}
.btn-outline:hover { background: var(--input-bg); border-color: var(--text-light); }
.btn-sm { padding: 5px 10px; font-size: 12px; }

.btn-secondary {
  display: block;
  width: 100%;
  padding: 14px;
  background: var(--input-bg);
  color: var(--text);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 16px;
  font-family: var(--font-heading);
  cursor: pointer;
  transition: background 0.2s;
}
.btn-secondary:hover { background: #edf0f7; }

/* ── Header ── */
.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 12px 16px;
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  margin-bottom: 14px;
}
.header-left { display: flex; align-items: center; gap: 10px; }
.header-logo { width: 100px; height: auto; border-radius: 8px; object-fit: contain; }
.header-info { line-height: 1.3; }
.header-name { font-family: var(--font-heading); font-size: 17px; margin: 0; }
.header-grade { font-size: 12px; color: var(--text-secondary); }
.header-right { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }

.mileage-badge {
  font-family: var(--font-heading);
  font-size: 13px;
  padding: 5px 10px;
  background: var(--warning-light);
  border: 1px solid rgba(245,158,11,0.25);
  border-radius: 20px;
  color: #92400E;
  white-space: nowrap;
}

/* ── Card ── */
.card {
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px;
  margin-bottom: 14px;
}
.card-title {
  font-family: var(--font-heading);
  font-size: 17px;
  color: var(--text);
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.card-title-icon {
  width: 24px;
  height: 24px;
  object-fit: contain;
  flex-shrink: 0;
}

.text-muted { color: var(--text-secondary); }
.hint { font-size: 13px; margin-bottom: 14px; }
.hint-warn { color: #b45309; font-weight: 500; margin-bottom: 16px; }

/* ── Unit Grid ── */
.unit-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
}
.unit-item {
  padding: 12px 14px;
  background: var(--input-bg);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  transition: box-shadow 0.2s;
}
.unit-item:hover { box-shadow: var(--shadow-xs); }
.unit-item-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.unit-item-name {
  font-family: var(--font-heading);
  font-size: 15px;
  color: var(--text);
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  padding-right: 8px;
}
.unit-item-level {
  font-family: var(--font-heading);
  font-size: 12px;
  color: var(--primary);
  background: var(--primary-light);
  padding: 2px 9px;
  border-radius: 14px;
  white-space: nowrap;
  flex-shrink: 0;
}

/* ── 대결 단원/난이도 버튼 ── */
.duel-unit-btns,
.duel-difficulty-btns {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 6px;
  margin-bottom: 4px;
}
.duel-unit-btns .duel-unit-btn,
.duel-difficulty-btns .duel-diff-btn {
  min-width: 72px;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  border: 1.5px solid var(--border);
  background: var(--input-bg);
  color: var(--text);
  font-size: 14px;
  font-family: var(--font-body);
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
}
.duel-unit-btns .duel-unit-btn:hover,
.duel-difficulty-btns .duel-diff-btn:hover {
  border-color: var(--primary);
  background: var(--primary-light);
}
.duel-unit-btns .duel-unit-btn.selected,
.duel-difficulty-btns .duel-diff-btn.selected {
  background: var(--primary-light);
  border-color: var(--primary);
  color: var(--primary);
  font-weight: 600;
}

/* ── Footer ── */
.footer-link { text-align: center; margin: 20px 0 30px; }
.home-link-img {
  width: 120px;
  transition: transform 0.2s;
}
.home-link-img:hover { transform: scale(1.05); }

/* ── Modal ── */
.modal {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 10000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
}
.modal-content {
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  padding: 24px;
  max-width: 380px;
  width: 100%;
}
.modal-content .btn-primary,
.modal-content .btn-secondary { width: 100%; }
.modal-actions {
  display: flex;
  gap: 10px;
  margin-top: 16px;
}
.modal-actions .btn-primary,
.modal-actions .btn-secondary { flex: 1; }
.duel-waiting-msg { margin-bottom: 16px; color: var(--text); font-size: 15px; }

/* ── 대결 화면 ── */
.duel-view {
  position: fixed;
  inset: 0;
  background: var(--bg);
  z-index: 2000;
  display: flex;
  flex-direction: column;
  padding: 16px;
}
.duel-view.hidden { display: none !important; }

.duel-leave-btn {
  position: absolute;
  top: 16px;
  left: 16px;
}
.duel-timer {
  position: absolute;
  top: 16px;
  right: 16px;
  font-family: var(--font-heading);
  font-size: 15px;
  color: var(--text-secondary);
}
.duel-problem-wrap {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: auto;
  margin-top: 48px;
  margin-bottom: 16px;
  padding: 20px;
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.duel-problem-img {
  max-width: 100%;
  max-height: 60vh;
  object-fit: contain;
  display: block;
}
.duel-status-msg {
  margin: 0 0 12px 0;
  min-height: 1.5em;
  color: var(--text-secondary);
  font-size: 14px;
  text-align: center;
}
.duel-answer-wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}
.duel-answer-area {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  flex: 1;
  min-width: 0;
}
.duel-answer-area .ans-input {
  padding: 10px 12px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--input-bg);
  color: var(--text);
  font-size: 16px;
  min-width: 60px;
  max-width: 100px;
  font-family: var(--font-body);
  outline: none;
}
.duel-answer-area .ans-input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-light);
}
.duel-answer-area .ans-input::placeholder { color: var(--text-light); }
.duel-answer-area .ans-input.single { min-width: 120px; max-width: 200px; }
.duel-answer-area .ans-input.multi { min-width: 70px; max-width: 100px; }

/* ── Responsive ── */
@media (max-width: 480px) {
  .view { padding: 8px; }
  .login-card { padding: 32px 20px 28px; }
  .card { padding: 16px; }
  .header { padding: 10px 12px; }
  .header-name { font-size: 15px; }
  .mileage-badge { font-size: 12px; padding: 4px 8px; }
  .unit-item-name { font-size: 14px; }
}