/* ========================================
   VitalRoot — 全局样式
   固本培元 · 预防为先
   ======================================== */

/* --- CSS 变量 --- */
:root {
  --color-primary: #2D7D46;
  --color-primary-light: #3a9957;
  --color-primary-dark: #1e5c31;
  --color-secondary: #1A5276;
  --color-tcm: #8B4513;
  --color-danger: #E74C3C;
  --color-warning: #F39C12;
  --color-success: #27AE60;
  --color-bg: #F8F9FA;
  --color-white: #FFFFFF;
  --color-text: #2C3E50;
  --color-text-light: #6C757D;
  --color-border: #DEE2E6;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.12);
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --max-width: 1100px;
  --transition: 0.2s ease;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  min-height: 100vh;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover {
  color: var(--color-primary-dark);
}

img {
  max-width: 100%;
  height: auto;
}

/* --- 通用布局 --- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1rem;
}

.section {
  padding: 3rem 0;
}

/* --- 顶部导航 --- */
.navbar {
  background: var(--color-white);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-sm);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary);
}

.navbar-brand span {
  color: var(--color-text);
  font-weight: 400;
  font-size: 0.8rem;
  opacity: 0.7;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 0.25rem;
}

.nav-links a {
  display: block;
  padding: 0.5rem 0.85rem;
  border-radius: var(--radius-sm);
  color: var(--color-text);
  font-size: 0.9rem;
  transition: background var(--transition), color var(--transition);
}

.nav-links a:hover,
.nav-links a.active {
  background: var(--color-primary);
  color: var(--color-white);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--color-text);
  padding: 0.25rem;
}

/* --- Hero 区域 --- */
.hero {
  text-align: center;
  padding: 4rem 1rem 3rem;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
  color: var(--color-white);
}

.hero h1 {
  font-size: 2.25rem;
  margin-bottom: 0.5rem;
  font-weight: 800;
}

.hero .subtitle {
  font-size: 1.1rem;
  opacity: 0.9;
  margin-bottom: 2rem;
}

.hero .cta-btn {
  display: inline-block;
  padding: 0.85rem 2.5rem;
  background: var(--color-white);
  color: var(--color-primary);
  font-size: 1.05rem;
  font-weight: 600;
  border-radius: 50px;
  box-shadow: var(--shadow-md);
  transition: transform var(--transition), box-shadow var(--transition);
}

.hero .cta-btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  color: var(--color-primary-dark);
}

/* --- 统计卡片 --- */
.stats-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-top: -2rem;
  position: relative;
  z-index: 1;
}

.stat-card {
  background: var(--color-white);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  text-align: center;
  box-shadow: var(--shadow-md);
}

.stat-card .number {
  font-size: 2rem;
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1.2;
}

.stat-card .number.danger {
  color: var(--color-danger);
}

.stat-card .number.success {
  color: var(--color-success);
}

.stat-card .label {
  font-size: 0.85rem;
  color: var(--color-text-light);
  margin-top: 0.25rem;
}

/* --- 功能入口卡片 --- */
.features-heading {
  text-align: center;
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.features-sub {
  text-align: center;
  color: var(--color-text-light);
  margin-bottom: 2rem;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.25rem;
}

.feature-card {
  background: var(--color-white);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
  transition: transform var(--transition), box-shadow var(--transition);
  cursor: pointer;
  display: flex;
  flex-direction: column;
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.feature-card .icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 1rem;
}

.feature-card .icon.green { background: #E8F5E9; }
.feature-card .icon.blue { background: #E3F2FD; }
.feature-card .icon.orange { background: #FFF3E0; }
.feature-card .icon.red { background: #FFEBEE; }
.feature-card .icon.brown { background: #EFEBE9; }

.feature-card h3 {
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
}

.feature-card p {
  font-size: 0.9rem;
  color: var(--color-text-light);
  flex: 1;
}

.feature-card .card-link {
  display: inline-block;
  margin-top: 1rem;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-primary);
}

/* --- 表单 --- */
.form-card {
  background: var(--color-white);
  border-radius: var(--radius-md);
  padding: 2rem;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
}

.form-steps {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 2rem;
  overflow-x: auto;
}

.step-indicator {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0.8rem;
  border-radius: 50px;
  font-size: 0.8rem;
  white-space: nowrap;
  background: var(--color-bg);
  color: var(--color-text-light);
  border: 1px solid var(--color-border);
  transition: all var(--transition);
}

.step-indicator.active {
  background: var(--color-primary);
  color: var(--color-white);
  border-color: var(--color-primary);
}

.step-indicator.done {
  background: #E8F5E9;
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.form-step {
  display: none;
}

.form-step.active {
  display: block;
  animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.form-group {
  margin-bottom: 1.25rem;
}

.form-group label {
  display: block;
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 0.35rem;
}

.form-group .hint {
  font-size: 0.8rem;
  color: var(--color-text-light);
  margin-bottom: 0.35rem;
}

.form-group input[type="number"],
.form-group input[type="text"],
.form-group select {
  width: 100%;
  padding: 0.6rem 0.8rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  background: var(--color-white);
  transition: border-color var(--transition);
  color: var(--color-text);
}

.form-group input:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(45,125,70,0.1);
}

.radio-group,
.checkbox-group {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.radio-group label,
.checkbox-group label {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.45rem 0.85rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-weight: 400;
  font-size: 0.9rem;
  transition: all var(--transition);
}

.radio-group label:hover,
.checkbox-group label:hover {
  border-color: var(--color-primary);
}

.radio-group input:checked + span,
.checkbox-group input:checked + span {
  color: var(--color-primary);
  font-weight: 600;
}

.radio-group label:has(input:checked),
.checkbox-group label:has(input:checked) {
  border-color: var(--color-primary);
  background: rgba(45,125,70,0.05);
}

.form-actions {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 1.5rem;
}

/* --- 按钮 --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.6rem 1.5rem;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: all var(--transition);
}

.btn-primary {
  background: var(--color-primary);
  color: var(--color-white);
}

.btn-primary:hover {
  background: var(--color-primary-dark);
}

.btn-outline {
  background: transparent;
  border: 1px solid var(--color-border);
  color: var(--color-text);
}

.btn-outline:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.btn-danger {
  background: var(--color-danger);
  color: var(--color-white);
}

.btn-lg {
  padding: 0.8rem 2rem;
  font-size: 1.05rem;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* --- 结果展示 --- */
.result-section {
  display: none;
}

.result-section.visible {
  display: block;
  animation: fadeIn 0.5s ease;
}

.result-header {
  text-align: center;
  margin-bottom: 2rem;
}

.result-header h2 {
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
}

.risk-overview {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.chart-container {
  background: var(--color-white);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
}

.chart-container canvas {
  max-height: 350px;
}

.risk-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1rem;
}

.risk-card {
  background: var(--color-white);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  box-shadow: var(--shadow-sm);
  border-left: 4px solid var(--color-border);
}

.risk-card.low { border-left-color: var(--color-success); }
.risk-card.medium { border-left-color: var(--color-warning); }
.risk-card.high { border-left-color: #E67E22; }
.risk-card.very-high { border-left-color: var(--color-danger); }

.risk-card .cancer-name {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.risk-level-badge {
  display: inline-block;
  padding: 0.15rem 0.6rem;
  border-radius: 50px;
  font-size: 0.75rem;
  font-weight: 600;
}

.risk-level-badge.low { background: #E8F5E9; color: #2E7D32; }
.risk-level-badge.medium { background: #FFF8E1; color: #F57F17; }
.risk-level-badge.high { background: #FFF3E0; color: #E65100; }
.risk-level-badge.very-high { background: #FFEBEE; color: #C62828; }

.risk-card .factors {
  margin-top: 0.75rem;
  font-size: 0.85rem;
}

.risk-card .factors .factor-item {
  padding: 0.2rem 0;
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.factor-item.modifiable { color: var(--color-primary); }
.factor-item.fixed { color: var(--color-text-light); }

.risk-card .advice {
  margin-top: 0.75rem;
  padding: 0.6rem;
  background: #F0FFF4;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  color: var(--color-primary-dark);
}

/* --- 筛查日历 --- */
.screening-timeline {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.screening-item {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  background: var(--color-white);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
}

.screening-item.urgent {
  border-color: var(--color-danger);
  background: #FFF8F8;
}

.screening-item .time-badge {
  min-width: 80px;
  text-align: center;
  padding: 0.5rem;
  border-radius: var(--radius-sm);
  background: var(--color-bg);
  font-weight: 700;
  font-size: 0.85rem;
}

.screening-item.urgent .time-badge {
  background: var(--color-danger);
  color: var(--color-white);
}

.screening-item .details h4 {
  font-size: 1rem;
  margin-bottom: 0.25rem;
}

.screening-item .details p {
  font-size: 0.85rem;
  color: var(--color-text-light);
}

/* --- Pyodide 加载状态 --- */
.pyodide-loading {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  padding: 2rem;
  color: var(--color-text-light);
  font-size: 0.95rem;
}

.spinner {
  width: 24px;
  height: 24px;
  border: 3px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* --- Footer --- */
.footer {
  background: var(--color-white);
  border-top: 1px solid var(--color-border);
  padding: 2rem 0;
  margin-top: 3rem;
  text-align: center;
  font-size: 0.8rem;
  color: var(--color-text-light);
}

.footer .disclaimer {
  max-width: 600px;
  margin: 0 auto 1rem;
  padding: 0.75rem;
  background: #FFF8E1;
  border-radius: var(--radius-sm);
  font-size: 0.78rem;
  color: #7D6608;
}

.footer .sources {
  margin-top: 0.5rem;
}

/* --- 页面标题 --- */
.page-header {
  padding: 2rem 0 1.5rem;
  text-align: center;
}

.page-header h1 {
  font-size: 1.75rem;
  margin-bottom: 0.35rem;
}

.page-header p {
  color: var(--color-text-light);
}

/* --- 响应式 --- */
@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 60px;
    left: 0;
    right: 0;
    background: var(--color-white);
    flex-direction: column;
    padding: 1rem;
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
  }

  .nav-links.open {
    display: flex;
  }

  .nav-toggle {
    display: block;
  }

  .hero h1 {
    font-size: 1.6rem;
  }

  .stats-row {
    grid-template-columns: 1fr;
    margin-top: -1rem;
  }

  .risk-overview {
    grid-template-columns: 1fr;
  }

  .feature-grid {
    grid-template-columns: 1fr;
  }

  .form-actions {
    flex-direction: column;
  }

  .screening-item {
    flex-direction: column;
  }
}

@media (max-width: 480px) {
  .hero {
    padding: 2.5rem 1rem 2rem;
  }

  .form-card {
    padding: 1.25rem;
  }

  .radio-group,
  .checkbox-group {
    flex-direction: column;
  }
}