/* ===== Reset & Base ===== */
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: #f5f5f5;
  color: #333;
  line-height: 1.6;
  padding-bottom: 20px;
}

/* ===== Header ===== */
.app-header {
  background: linear-gradient(135deg, #4a90d9, #357abd);
  color: #fff;
  padding: 16px;
  display: flex;
  align-items: center;
  gap: 12px;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 8px rgba(0,0,0,0.15);
}
.app-header h1 {
  font-size: 18px;
  font-weight: 600;
  flex: 1;
}

/* ===== Hamburger Menu ===== */
.menu-btn {
  background: none;
  border: none;
  color: #fff;
  font-size: 28px;
  cursor: pointer;
  padding: 4px;
  line-height: 1;
}
.menu-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.4);
  z-index: 200;
}
.menu-overlay.open { display: block; }
.side-menu {
  position: fixed;
  top: 0;
  left: -260px;
  width: 260px;
  height: 100%;
  background: #fff;
  z-index: 300;
  transition: left 0.25s ease;
  box-shadow: 2px 0 12px rgba(0,0,0,0.15);
  padding-top: 60px;
}
.side-menu.open { left: 0; }
.side-menu-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 24px;
  font-size: 16px;
  color: #333;
  cursor: pointer;
  border: none;
  background: none;
  width: 100%;
  text-align: left;
}
.side-menu-item:hover { background: #f0f4ff; color: #4a90d9; }
.side-menu-item.active { background: #e8f0fe; color: #4a90d9; font-weight: 600; }
.side-menu-item .icon { font-size: 20px; }

/* ===== Page Container ===== */
.page { display: none; padding: 16px; }
.page.active { display: block; }

/* ===== Form Styles ===== */
.form-section {
  background: #fff;
  border-radius: 12px;
  padding: 20px;
  margin-bottom: 16px;
  box-shadow: 0 1px 4px rgba(0,0,0,0.08);
}
.form-section h2 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 16px;
  color: #4a90d9;
}
.form-row {
  display: flex;
  gap: 12px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}
.form-group {
  flex: 1;
  min-width: 80px;
}
.form-group label {
  display: block;
  font-size: 13px;
  color: #666;
  margin-bottom: 4px;
}
.form-group input {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid #ddd;
  border-radius: 8px;
  font-size: 16px;
  outline: none;
  transition: border-color 0.2s;
}
.form-group input:focus {
  border-color: #4a90d9;
  box-shadow: 0 0 0 3px rgba(74,144,217,0.15);
}
.btn {
  padding: 12px 24px;
  border: none;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  width: 100%;
}
.btn-primary {
  background: #4a90d9;
  color: #fff;
}
.btn-primary:hover { background: #357abd; }
.btn-danger {
  background: #e74c3c;
  color: #fff;
  padding: 6px 12px;
  font-size: 13px;
  width: auto;
}

/* ===== Score Card ===== */
.score-cards { display: flex; flex-direction: column; gap: 12px; }
.score-card {
  background: #fff;
  border-radius: 12px;
  padding: 16px;
  box-shadow: 0 1px 4px rgba(0,0,0,0.08);
  border-left: 4px solid #ddd;
}
.score-card.grade-excellent { border-left-color: #27ae60; }
.score-card.grade-good { border-left-color: #f1c40f; }
.score-card.grade-fair { border-left-color: #e67e22; }
.score-card.grade-poor { border-left-color: #e74c3c; }
.score-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
}
.score-card-time { font-size: 13px; color: #999; }
.score-card-grade {
  font-size: 13px;
  font-weight: 600;
  padding: 2px 10px;
  border-radius: 12px;
}
.grade-excellent .score-card-grade { background: #e8f5e9; color: #27ae60; }
.grade-good .score-card-grade { background: #fff8e1; color: #f39c12; }
.grade-fair .score-card-grade { background: #fbe9e7; color: #e67e22; }
.grade-poor .score-card-grade { background: #fce4ec; color: #e74c3c; }
.score-card-values {
  display: flex;
  gap: 16px;
  font-size: 14px;
}
.score-card-values span {
  color: #555;
}
.score-card-values .highlight {
  font-weight: 700;
  color: #333;
}
.score-card-note {
  font-size: 13px;
  color: #999;
  margin-top: 6px;
}

/* ===== Summary Stats ===== */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-bottom: 16px;
}
.stat-card {
  background: #fff;
  border-radius: 12px;
  padding: 16px;
  text-align: center;
  box-shadow: 0 1px 4px rgba(0,0,0,0.08);
}
.stat-card .stat-value {
  font-size: 24px;
  font-weight: 700;
  color: #4a90d9;
}
.stat-card .stat-label {
  font-size: 13px;
  color: #999;
  margin-top: 4px;
}

/* ===== Charts ===== */
.chart-container {
  background: #fff;
  border-radius: 12px;
  padding: 16px;
  margin-bottom: 16px;
  box-shadow: 0 1px 4px rgba(0,0,0,0.08);
}
.chart-container h3 {
  font-size: 15px;
  color: #555;
  margin-bottom: 12px;
}
.chart-container canvas {
  max-height: 250px;
}

/* ===== Settings ===== */
.setting-group {
  background: #fff;
  border-radius: 12px;
  padding: 20px;
  margin-bottom: 16px;
  box-shadow: 0 1px 4px rgba(0,0,0,0.08);
}
.setting-group h3 {
  font-size: 15px;
  color: #4a90d9;
  margin-bottom: 12px;
}
.range-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
  flex-wrap: wrap;
}
.range-row input {
  width: 60px;
  padding: 6px 8px;
  border: 1px solid #ddd;
  border-radius: 6px;
  font-size: 14px;
  text-align: center;
}
.range-row .range-label {
  font-size: 13px;
  color: #666;
  min-width: 40px;
}
.range-row .range-sep {
  color: #999;
}

/* ===== Empty State ===== */
.empty-state {
  text-align: center;
  padding: 40px 20px;
  color: #999;
}
.empty-state .icon { font-size: 48px; margin-bottom: 12px; }
.empty-state p { font-size: 14px; }

/* ===== Responsive ===== */
@media (min-width: 768px) {
  .page { max-width: 600px; margin: 0 auto; }
  .stats-grid { grid-template-columns: repeat(4, 1fr); }
}

@media (max-width: 480px) {
  .form-row { flex-direction: column; }
  .form-group { min-width: 100%; }
}