/* ============================================================
   AI 运动教练 — 用户端共享设计系统
   基于 DESIGN_SYSTEM.md v1.0
   ============================================================ */

/* ===== CSS Custom Properties ===== */
:root {
  /* Brand */
  --color-primary: #FF6B35;
  --color-primary-hover: #E55A2B;
  --color-secondary: #004E89;
  --color-success: #2EC4B6;
  --color-warning: #FFBF46;
  --color-danger: #E4572E;

  /* Neutrals */
  --bg-page: #FAFAFA;
  --bg-card: #FFFFFF;
  --bg-warm: #F9F9FB;
  --text-primary: #1A1A2E;
  --text-secondary: #6B7280;
  --text-placeholder: #9CA3AF;
  --border-default: #E5E7EB;
  --border-light: #F3F4F6;

  /* Semantic backgrounds */
  --semantic-green-bg: #F0FDF4;
  --semantic-green-text: #059669;
  --semantic-yellow-bg: #FFFBEB;
  --semantic-yellow-text: #D97706;
  --semantic-red-bg: #FEF2F2;
  --semantic-red-text: #DC2626;
  --semantic-blue-bg: #EFF6FF;
  --semantic-blue-text: #2563EB;
  --semantic-orange-bg: #FFF4F0;

  /* Typography */
  --font-sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --font-mono: "Inter", "JetBrains Mono", "SF Mono", "Menlo", monospace;

  /* Radii */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(6,8,24,0.04);
  --shadow-md: 0 1px 2px rgba(6,8,24,0.04), 0 4px 12px rgba(6,8,24,0.06);
  --shadow-lg: 0 1px 3px rgba(6,8,24,0.05), 0 24px 48px rgba(0,48,84,0.10);
  --shadow-glow-orange: 0 8px 32px rgba(255,107,53,0.25);

  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 12px;
  --space-lg: 16px;
  --space-xl: 20px;
  --space-2xl: 24px;
  --space-3xl: 32px;
  --space-section: 48px;

  /* Layout */
  --header-height: 64px;
  --max-width: 1100px;
  --mobile-width: 430px;

  /* Animation */
  --ease-out: cubic-bezier(0.4, 0, 0.2, 1);
}

/* ===== Reset ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-sans);
  background: var(--bg-page);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

/* ===== Header/Nav ===== */
.user-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  background: var(--bg-card);
  border-bottom: 1px solid var(--border-default);
  display: flex;
  align-items: center;
}
.user-header-inner {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-2xl);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.user-header-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}
.user-header-logo .logo-icon {
  width: 34px;
  height: 34px;
  background: linear-gradient(135deg, var(--color-primary), #FF8C5A);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #FFF;
  font-size: 16px;
  font-weight: 700;
}
.user-header-logo .logo-text {
  font-size: 17px;
  font-weight: 700;
  color: var(--text-primary);
}
.user-header-nav {
  display: flex;
  align-items: center;
  gap: var(--space-2xl);
}
.user-header-nav a {
  font-size: 14px;
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.15s;
  font-weight: 500;
}
.user-header-nav a:hover,
.user-header-nav a.active {
  color: var(--color-primary);
}
.user-header-nav a.active {
  font-weight: 600;
}
.user-avatar {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--color-secondary), #0066B3);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #FFF;
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
}

/* ===== Main Content ===== */
.main-content {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-3xl) var(--space-2xl) 80px;
}

/* ===== Page Title ===== */
.page-title {
  font-size: 28px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-sm);
}
.page-subtitle {
  font-size: 15px;
  color: var(--text-secondary);
  margin-bottom: var(--space-3xl);
}

/* ===== Cards ===== */
.card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: var(--space-2xl);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border-light);
  margin-bottom: var(--space-lg);
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: 10px 24px;
  border-radius: var(--radius-full);
  font-size: 14px;
  font-weight: 600;
  font-family: var(--font-sans);
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: transform 0.15s, box-shadow 0.15s, background 0.15s;
  white-space: nowrap;
}
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

.btn-primary {
  background: var(--color-primary);
  color: #FFF;
}
.btn-primary:hover {
  background: var(--color-primary-hover);
  box-shadow: var(--shadow-glow-orange);
}
.btn-secondary {
  background: var(--bg-card);
  color: var(--text-primary);
  border: 1px solid var(--border-default);
}
.btn-secondary:hover { background: var(--bg-warm); }
.btn-ghost {
  background: transparent;
  color: var(--color-primary);
}
.btn-ghost:hover { background: var(--semantic-orange-bg); }
.btn-lg { padding: 14px 36px; font-size: 16px; }
.btn-sm { padding: 6px 16px; font-size: 13px; }

/* ===== Form Elements ===== */
.form-group {
  margin-bottom: var(--space-xl);
}
.form-label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-sm);
}
.form-input {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  font-size: 15px;
  font-family: var(--font-sans);
  color: var(--text-primary);
  background: var(--bg-card);
  transition: border-color 0.15s, box-shadow 0.15s;
  outline: none;
}
.form-input:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(255,107,53,0.12);
}
.form-input::placeholder { color: var(--text-placeholder); }
.form-hint {
  font-size: 13px;
  color: var(--text-secondary);
  margin-top: var(--space-xs);
}

/* ===== Badges ===== */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  font-size: 12px;
  font-weight: 600;
  line-height: 1.4;
}
.badge-green { background: var(--semantic-green-bg); color: var(--semantic-green-text); }
.badge-yellow { background: var(--semantic-yellow-bg); color: var(--semantic-yellow-text); }
.badge-red { background: var(--semantic-red-bg); color: var(--semantic-red-text); }
.badge-blue { background: var(--semantic-blue-bg); color: var(--semantic-blue-text); }
.badge-orange { background: var(--semantic-orange-bg); color: var(--color-primary); }

/* ===== Metric Grid ===== */
.metrics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}
.metric-card {
  background: var(--bg-card);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  text-align: center;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-light);
}
.metric-card .metric-label {
  font-size: 11px;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-xs);
}
.metric-card .metric-value {
  font-family: var(--font-mono);
  font-size: 24px;
  font-weight: 700;
  color: var(--color-secondary);
  margin-bottom: 2px;
}
.metric-card .metric-trend {
  font-size: 12px;
  font-weight: 500;
}
.metric-card .metric-trend.up { color: var(--color-success); }
.metric-card .metric-trend.down { color: var(--color-danger); }

/* ===== Two Column Layout ===== */
.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-lg);
}

/* ===== Data Table ===== */
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}
.data-table th {
  text-align: left;
  padding: 12px 16px;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-bottom: 2px solid var(--border-default);
  background: var(--bg-warm);
}
.data-table td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--border-light);
  color: var(--text-primary);
  font-variant-numeric: tabular-nums;
}
.data-table td .mono {
  font-family: var(--font-mono);
  font-size: 13px;
}
.data-table tbody tr:hover { background: var(--semantic-orange-bg); }

/* ===== Section Divider ===== */
.section-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-md);
  border-bottom: 1px solid var(--border-light);
}

/* ===== Toggle Switch ===== */
.toggle {
  position: relative;
  display: inline-block;
  width: 48px;
  height: 26px;
}
.toggle input { display: none; }
.toggle-slider {
  position: absolute;
  inset: 0;
  background: var(--border-default);
  border-radius: 26px;
  cursor: pointer;
  transition: background 0.2s;
}
.toggle-slider::after {
  content: "";
  position: absolute;
  top: 3px;
  left: 3px;
  width: 20px;
  height: 20px;
  background: #FFF;
  border-radius: 50%;
  transition: transform 0.2s;
  box-shadow: 0 1px 3px rgba(0,0,0,0.15);
}
.toggle input:checked + .toggle-slider { background: var(--color-success); }
.toggle input:checked + .toggle-slider::after { transform: translateX(22px); }

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .user-header-inner { padding: 0 var(--space-lg); }
  .user-header-nav { display: none; }
  .main-content { padding: var(--space-xl) var(--space-lg) 80px; }
  .two-col { grid-template-columns: 1fr; }
  .page-title { font-size: 24px; }
}

/* ===== Chart Canvas ===== */
.chart-canvas {
  width: 100%;
  height: 100%;
  min-height: 220px;
}

/* ===== Splits Table ===== */
.splits-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}
.splits-table th {
  text-align: center;
  padding: 10px 8px;
  font-size: 11px;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  border-bottom: 2px solid var(--border-default);
  background: var(--bg-warm);
}
.splits-table td {
  text-align: center;
  padding: 10px 8px;
  border-bottom: 1px solid var(--border-light);
  color: var(--text-primary);
  font-variant-numeric: tabular-nums;
  font-family: var(--font-mono);
  font-size: 13px;
}
.splits-table tbody tr:hover { background: var(--semantic-orange-bg); }

@media (max-width: 430px) {
  .metrics-grid { grid-template-columns: 1fr 1fr; }
  .data-table { font-size: 13px; }
  .data-table th,
  .data-table td { padding: 10px 12px; }
  .splits-table { font-size: 12px; }
  .splits-table th,
  .splits-table td { padding: 8px 6px; }
}