/* common-app - learning-app / battle-app과 동일한 디자인 */
:root {
  --primary: #4F6BED;
  --primary-hover: #3D57D8;
  --primary-light: rgba(79, 107, 237, 0.10);
  --success: #22C55E;
  --success-light: rgba(34, 197, 94, 0.10);
  --danger: #EF4444;
  --danger-light: rgba(239, 68, 68, 0.10);
  --bg: #F0F2F8;
  --card: #FFFFFF;
  --text: #1E293B;
  --text-secondary: #64748B;
  --text-light: #94A3B8;
  --border: #E2E8F0;
  --input-bg: #F8FAFC;
  --shadow: 0 4px 16px rgba(0,0,0,0.07);
  --shadow-sm: 0 1px 4px rgba(0,0,0,0.06);
  --radius: 16px;
  --radius-sm: 10px;
  --radius-xs: 8px;
  --font-heading: 'Jua', sans-serif;
  --font-body: 'Noto Sans KR', system-ui, 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 {
  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; }
.splash-text { font-family: var(--font-heading); color: var(--text-secondary); font-size: 15px; }

.view { max-width: 680px; margin: 0 auto; padding: 16px; }

.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-name { font-family: var(--font-heading); font-size: 17px; margin: 0; }

.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;
}
.btn-primary:hover { background: var(--primary-hover); }
.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;
}
.btn-outline:hover { background: var(--input-bg); }

.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;
}
.text-muted { color: var(--text-secondary); }
.hint { font-size: 13px; margin-bottom: 14px; }

.form-group { margin-bottom: 14px; }
.form-group label {
  display: block;
  font-size: 12px;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 5px;
}
.form-group input {
  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;
}
.form-group input:focus { border-color: var(--primary); }

/* common-app 전용 */
.common-wait-card { text-align: center; padding: 40px 20px; }
.common-wait-text {
  font-family: var(--font-heading);
  font-size: 22px;
  color: var(--primary);
}
.common-timer {
  font-family: var(--font-heading);
  font-size: 20px;
  color: var(--primary);
  margin-left: auto;
}
.common-quiz-hint {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 16px;
}
.common-feedback {
  margin-top: 14px;
  padding: 12px;
  border-radius: var(--radius-sm);
  font-size: 15px;
}
.common-feedback.correct { background: var(--success-light); color: #166534; }
.common-feedback.wrong { background: var(--danger-light); color: #991b1b; }

.common-online-list { display: flex; flex-direction: column; gap: 8px; }
.common-online-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  background: var(--input-bg);
  border-radius: var(--radius-sm);
  border: 1.5px solid var(--border);
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
}
.common-online-item:hover { border-color: var(--primary); background: var(--primary-light); }
.common-online-item.selected { border-color: var(--primary); background: var(--primary-light); font-weight: 600; }
.common-online-item .name { flex: 1; font-family: var(--font-heading); }
.common-online-item .grade { font-size: 12px; color: var(--text-secondary); }

.common-result-list { display: flex; flex-direction: column; gap: 8px; }
.common-result-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 14px;
  background: var(--input-bg);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}
.common-result-item .name { font-family: var(--font-heading); }
.common-result-item .status { font-size: 14px; font-weight: 600; }
.common-result-item .status.correct { color: var(--success); }
.common-result-item .status.wrong { color: var(--danger); }
.common-result-item .status.pending { color: var(--text-secondary); }

.footer-link { text-align: center; margin: 20px 0 30px; }
.home-link-img { width: 120px; }