:root {
  --primary: #3b82f6;
  --primary-dark: #1d4ed8;
  --primary-light: #eff6ff;
  --fuel-color: #f59e0b;
  --fuel-light: #fef3c7;
  --elec-color: #10b981;
  --elec-light: #d1fae5;
  --maint-color: #8b5cf6;
  --maint-light: #ede9fe;
  --bg-main: #f8fafc;
  --card-bg: #ffffff;
  --text-main: #0f172a;
  --text-muted: #64748b;
  --border-color: #e2e8f0;
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background-color: var(--bg-main);
  color: var(--text-main);
  line-height: 1.5;
  padding-bottom: calc(76px + env(safe-area-inset-bottom, 0px)); /* Space for mobile bottom bar + iOS Home indicator */
  -webkit-text-size-adjust: 100%;
}

@media (min-width: 768px) {
  body {
    padding-bottom: 32px; /* Tablets / iPad / Desktop */
  }
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: #cbd5e1;
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: #94a3b8;
}

/* Vehicle Selector Bar */
.vehicle-badge {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  border-radius: 9999px;
  font-size: 0.75rem;
  font-weight: 600;
}
.badge-gas { background-color: #fef3c7; color: #b45309; }
.badge-ev { background-color: #d1fae5; color: #065f46; }
.badge-phev { background-color: #e0e7ff; color: #3730a3; }
.badge-erev { background-color: #fce7f3; color: #9d174d; }
.badge-hybrid { background-color: #ccfbf1; color: #115e59; }

/* Tri-Calculation Highlight */
.tri-input-wrapper {
  position: relative;
  transition: all 0.2s ease;
}

.tri-calculated {
  background-color: #f0fdf4 !important;
  border-color: #22c55e !important;
  color: #15803d !important;
  font-weight: 600;
}

.calc-tag {
  display: inline-flex;
  align-items: center;
  gap: 3px;
  font-size: 0.72rem;
  padding: 2px 6px;
  border-radius: 4px;
  background: #dcfce7;
  color: #166534;
  font-weight: 500;
  animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(-2px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Quick Select Pills */
.pill-btn {
  padding: 6px 12px;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  background: #fff;
  font-size: 0.875rem;
  color: #334155;
  cursor: pointer;
  transition: all 0.15s ease;
}
.pill-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: var(--primary-light);
}
.pill-btn.active {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
  font-weight: 500;
}

/* Stat Cards */
.stat-card {
  background: #fff;
  border-radius: 14px;
  padding: 16px;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

/* Tab Navigation */
.nav-tab-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  font-size: 0.95rem;
  font-weight: 500;
  color: #64748b;
  border-bottom: 2px solid transparent;
  cursor: pointer;
  transition: all 0.2s;
  white-space: nowrap;
}
.nav-tab-btn:hover {
  color: var(--primary);
}
.nav-tab-btn.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
  font-weight: 600;
}

/* Mobile Bottom Navigation */
.mobile-nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  color: #64748b;
  padding: 6px 0;
  flex: 1;
  text-decoration: none;
  cursor: pointer;
  transition: color 0.15s;
}
.mobile-nav-item.active {
  color: var(--primary);
  font-weight: 600;
}
.mobile-nav-item svg {
  width: 22px;
  height: 22px;
  margin-bottom: 2px;
}

/* Toast Notifications */
#toast-container {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 99999;
  display: flex;
  flex-direction: column;
  gap: 10px;
  pointer-events: none;
}
.toast {
  background: #1e293b;
  color: #fff;
  padding: 12px 18px;
  border-radius: 10px;
  box-shadow: 0 10px 25px rgba(0,0,0,0.2);
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  gap: 8px;
  pointer-events: auto;
  animation: slideDown 0.3s ease;
}
.toast.toast-success {
  background: #065f46;
  border-left: 4px solid #34d399;
}
.toast.toast-error {
  background: #991b1b;
  border-left: 4px solid #f87171;
}

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Modals */
.modal-overlay {
  position: fixed;
  inset: 0;
  background-color: rgba(15, 23, 42, 0.6);
  backdrop-filter: blur(4px);
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
}
.modal-content {
  background: #ffffff;
  border-radius: 16px;
  max-width: 560px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
  animation: popIn 0.2s ease-out;
}
@keyframes popIn {
  from { opacity: 0; transform: scale(0.96); }
  to { opacity: 1; transform: scale(1); }
}

/* Form Input Styling */
.form-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  color: #334155;
  margin-bottom: 6px;
}
.form-input, .form-select, .form-textarea {
  width: 100%;
  padding: 10px 14px;
  border: 1.5px solid #cbd5e1;
  border-radius: 8px;
  font-size: 0.95rem;
  color: #0f172a;
  background-color: #fff;
  outline: none;
  transition: all 0.15s;
}
.form-input:focus, .form-select:focus, .form-textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

/* Battery SOC Progress bar */
.soc-bar-container {
  height: 12px;
  background: #e2e8f0;
  border-radius: 6px;
  overflow: hidden;
  position: relative;
}
.soc-fill {
  height: 100%;
  background: linear-gradient(90deg, #10b981 0%, #059669 100%);
  border-radius: 6px;
  transition: width 0.3s ease;
}

/* ================= iOS (iPhone & iPad) 专属深度适配 ================= */

/* 1. iOS 刘海屏 / 灵动岛 (Notch / Dynamic Island) 与 底部 Home 条 (Home Indicator) */
header {
  padding-top: env(safe-area-inset-top, 0px);
}

.mobile-bottom-nav {
  padding-bottom: calc(4px + env(safe-area-inset-bottom, 0px));
}

/* 2. 避免 iOS Safari 聚焦输入框时强制页面局部放大 (font-size < 16px 会触发自动放大) */
@media screen and (max-width: 768px) {
  .form-input, .form-select, .form-textarea, input, select, textarea {
    font-size: 16px !important;
  }
}

/* 3. iOS 平滑惯性滚动体验 */
.overflow-y-auto, .overflow-x-auto, .modal-content {
  -webkit-overflow-scrolling: touch;
}

/* 4. iPadOS 平板端专属适配 (768px ~ 1024px 竖屏 & 横屏) */
@media (min-width: 768px) and (max-width: 1024px) {
  .nav-tab-btn {
    padding: 10px 14px;
    font-size: 0.9rem;
  }
  .stat-card {
    padding: 14px;
  }
}