/* ============================================
   智能导诊 - 精美设计系统
   老年人健康助手 v2.0
   ============================================

   目录:
   1.  设计系统变量
   2.  主题系统 (亮色/暗色)
   3.  背景装饰
   4.  重置与基础样式
   5.  排版系统
   6.  布局系统
   7.  组件样式
     7.1  头部导航
     7.2  主题切换
     7.3  英雄区域
     7.4  快速症状选择
     7.5  表单
     7.6  按钮
     7.7  卡片
     7.8  结果页
     7.9  急诊警报
     7.10 历史记录
     7.11 加载状态
     7.12 提示框
   8.  动画与过渡
   9.  响应式设计
   10. 工具类

   ============================================ */

/* ============================================
   1. 设计系统变量
   ============================================ */

:root {
  /* ---- 品牌色（温暖医疗蓝） ---- */
  --primary-50: #eff6ff;
  --primary-100: #dbeafe;
  --primary-200: #bfdbfe;
  --primary-300: #93c5fd;
  --primary-400: #60a5fa;
  --primary-500: #3b82f6;
  --primary-600: #2563eb;
  --primary-700: #1d4ed8;
  --primary-800: #1e40af;
  --primary-900: #1e3a8a;

  /* ---- 辅助色（珊瑚暖色） ---- */
  --coral-50: #fff1f2;
  --coral-100: #ffe4e6;
  --coral-200: #fecdd3;
  --coral-400: #fb7185;
  --coral-500: #f43f5e;
  --coral-600: #e11d48;

  /* ---- 语义色 ---- */
  --danger-50: #fef2f2;
  --danger-100: #fee2e2;
  --danger-500: #ef4444;
  --danger-600: #dc2626;
  --danger-700: #b91c1c;

  --success-50: #f0fdf4;
  --success-100: #dcfce7;
  --success-500: #22c55e;
  --success-600: #16a34a;
  --success-700: #15803d;

  --warning-50: #fffbeb;
  --warning-100: #fef3c7;
  --warning-500: #f59e0b;
  --warning-600: #d97706;
  --warning-700: #b45309;

  /* ---- 中性色 ---- */
  --gray-50: #f8fafc;
  --gray-100: #f1f5f9;
  --gray-200: #e2e8f0;
  --gray-300: #cbd5e1;
  --gray-400: #94a3b8;
  --gray-500: #64748b;
  --gray-600: #475569;
  --gray-700: #334155;
  --gray-800: #1e293b;
  --gray-900: #0f172a;

  /* ---- 亮色主题 ---- */
  --bg-gradient-start: #dbeafe;   /* 蓝 100 */
  --bg-gradient-mid: #fce7f3;     /* 粉红 100 */
  --bg-gradient-end: #e0f2fe;     /* 天蓝 100 */
  --bg-primary: #f1f5f9;
  --text-primary: var(--gray-900);
  --text-secondary: var(--gray-500);
  --text-tertiary: var(--gray-400);
  --border-color: rgba(148, 163, 184, 0.25);
  --card-bg: rgba(255, 255, 255, 0.85);
  --card-border: rgba(255, 255, 255, 0.8);
  --card-shadow: 0 8px 32px rgba(0, 0, 0, 0.08);
  --card-shadow-hover: 0 16px 48px rgba(0, 0, 0, 0.14);
  --input-bg: rgba(255, 255, 255, 0.95);
  --input-border: rgba(148, 163, 184, 0.35);
  --input-focus-border: var(--primary-400);
  --header-bg: rgba(255, 255, 255, 0.8);
  --symptom-chip-bg: rgba(219, 234, 254, 0.7);
  --symptom-chip-hover: rgba(191, 219, 254, 0.9);
  --symptom-chip-active: rgba(147, 197, 253, 1);
  --deco-blob-1: rgba(59, 130, 246, 0.18);
  --deco-blob-2: rgba(244, 63, 94, 0.12);
  --deco-blob-3: rgba(251, 191, 36, 0.1);

  /* ---- 字号阶梯（大字号，适合老年人） ---- */
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;
  --text-5xl: 3rem;
  --text-6xl: 3.75rem;

  /* ---- 间距系统 ---- */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;

  /* ---- 字号档位（用于放大切换） ---- */
  --font-scale: 1;

  /* ---- 圆角 ---- */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-2xl: 32px;
  --radius-full: 9999px;

  /* ---- 过渡 ---- */
  --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);

  /* ---- 容器 ---- */
  --container-sm: 640px;
  --container-md: 768px;
}

/* ============================================
   2. 主题系统
   ============================================ */

/* 暗色主题 */
[data-theme="dark"] {
  --bg-gradient-start: #0f172a;
  --bg-gradient-mid: #1e1b2e;
  --bg-gradient-end: #0b1120;
  --bg-primary: #0f172a;
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-tertiary: #64748b;
  --border-color: rgba(71, 85, 105, 0.3);
  --card-bg: rgba(30, 41, 59, 0.7);
  --card-border: rgba(71, 85, 105, 0.3);
  --card-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
  --card-shadow-hover: 0 16px 48px rgba(0, 0, 0, 0.4);
  --input-bg: rgba(15, 23, 42, 0.8);
  --input-border: rgba(71, 85, 105, 0.4);
  --input-focus-border: var(--primary-400);
  --header-bg: rgba(15, 23, 42, 0.75);
  --symptom-chip-bg: rgba(30, 58, 138, 0.3);
  --symptom-chip-hover: rgba(30, 58, 138, 0.5);
  --symptom-chip-active: rgba(30, 58, 138, 0.7);
  --deco-blob-1: rgba(59, 130, 246, 0.08);
  --deco-blob-2: rgba(244, 63, 94, 0.05);
  --deco-blob-3: rgba(251, 191, 36, 0.04);
}

/* 跟随系统 */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg-gradient-start: #0f172a;
    --bg-gradient-mid: #1e1b2e;
    --bg-gradient-end: #0b1120;
    --bg-primary: #0f172a;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-tertiary: #64748b;
    --border-color: rgba(71, 85, 105, 0.3);
    --card-bg: rgba(30, 41, 59, 0.7);
    --card-border: rgba(71, 85, 105, 0.3);
    --card-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    --card-shadow-hover: 0 16px 48px rgba(0, 0, 0, 0.4);
    --input-bg: rgba(15, 23, 42, 0.8);
    --input-border: rgba(71, 85, 105, 0.4);
    --input-focus-border: var(--primary-400);
    --header-bg: rgba(15, 23, 42, 0.75);
    --symptom-chip-bg: rgba(30, 58, 138, 0.3);
    --symptom-chip-hover: rgba(30, 58, 138, 0.5);
    --symptom-chip-active: rgba(30, 58, 138, 0.7);
    --deco-blob-1: rgba(59, 130, 246, 0.08);
    --deco-blob-2: rgba(244, 63, 94, 0.05);
    --deco-blob-3: rgba(251, 191, 36, 0.04);
  }
}

/* ---- 字号放大档位 ---- */
[data-font-size="large"] {
  --text-xs: 0.875rem;
  --text-sm: 1rem;
  --text-base: 1.125rem;
  --text-lg: 1.375rem;
  --text-xl: 1.5rem;
  --text-2xl: 1.75rem;
  --text-3xl: 2.25rem;
  --text-4xl: 2.75rem;
  --text-5xl: 3.5rem;
  --text-6xl: 4.25rem;
}

[data-font-size="xl"] {
  --text-xs: 1rem;
  --text-sm: 1.125rem;
  --text-base: 1.375rem;
  --text-lg: 1.5rem;
  --text-xl: 1.75rem;
  --text-2xl: 2.125rem;
  --text-3xl: 2.75rem;
  --text-4xl: 3.25rem;
  --text-5xl: 4rem;
  --text-6xl: 4.75rem;
}

/* ============================================
   3. 背景装饰
   ============================================ */

/* 渐变背景 */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  z-index: -2;
  background: linear-gradient(
    135deg,
    var(--bg-gradient-start) 0%,
    var(--bg-gradient-mid) 40%,
    var(--bg-gradient-end) 100%
  );
  transition: background var(--transition-slow);
}

/* 装饰性浮动模糊圆 */
body::after {
  content: '';
  position: fixed;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  pointer-events: none;
  transition: opacity var(--transition-slow);
}

/* 大圆 1 - 左上 */
.bg-blob {
  position: fixed;
  border-radius: 50%;
  filter: blur(80px);
  pointer-events: none;
  z-index: -1;
  transition: background var(--transition-slow);
}

.bg-blob-1 {
  width: 500px;
  height: 500px;
  top: -150px;
  left: -100px;
  background: var(--deco-blob-1);
  animation: blobFloat1 20s ease-in-out infinite;
}

.bg-blob-2 {
  width: 400px;
  height: 400px;
  bottom: -100px;
  right: -80px;
  background: var(--deco-blob-2);
  animation: blobFloat2 25s ease-in-out infinite;
}

.bg-blob-3 {
  width: 300px;
  height: 300px;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: var(--deco-blob-3);
  animation: blobFloat3 30s ease-in-out infinite;
}

/* 网格纹理叠加 */
.bg-grid {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(148, 163, 184, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(148, 163, 184, 0.04) 1px, transparent 1px);
  background-size: 60px 60px;
}

/* ============================================
   4. 重置与基础样式
   ============================================ */

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

html {
  scroll-behavior: smooth;
  -webkit-tap-highlight-color: transparent;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: var(--text-lg);
  line-height: 1.7;
  min-height: 100vh;
  color: var(--text-primary);
  transition: color var(--transition-slow);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  position: relative;
}

/* 老年人友好：增大触摸目标 */
button,
a,
input,
select,
textarea,
.symptom-chip,
.theme-toggle-btn {
  min-height: 48px;
  font-size: var(--text-lg);
}

/* 焦点样式 */
:focus-visible {
  outline: 3px solid var(--primary-400);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

/* 选中高亮 */
::selection {
  background-color: var(--primary-200);
  color: var(--primary-900);
}

/* 滚动条 */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--gray-300);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--gray-400);
}

[data-theme="dark"] ::-webkit-scrollbar-thumb {
  background: var(--gray-600);
}

/* ============================================
   5. 排版系统
   ============================================ */

h1, h2, h3, h4 {
  line-height: 1.3;
  font-weight: 700;
  color: var(--text-primary);
}

h1 {
  font-size: var(--text-4xl);
  letter-spacing: -0.02em;
}

h2 {
  font-size: var(--text-2xl);
}

h3 {
  font-size: var(--text-xl);
}

p {
  color: var(--text-secondary);
  line-height: 1.7;
}

a {
  color: var(--primary-500);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--primary-600);
}

/* ============================================
   6. 布局系统
   ============================================ */

.page {
  min-height: 100vh;
  padding: var(--space-4) var(--space-4) var(--space-10);
  padding-top: calc(68px + var(--space-4));
  position: relative;
  z-index: 1;
}

.page.hidden {
  display: none !important;
}

/* 通用隐藏类 */
.hidden {
  display: none !important;
}

.page-enter {
  animation: pageEnter 0.5s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

.container {
  width: 100%;
  max-width: var(--container-sm);
  margin: 0 auto;
  padding: 0 var(--space-4);
}

/* ============================================
   7. 组件样式
   ============================================ */

/* ===== 7.1 头部导航 ===== */

.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: var(--header-bg);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--border-color);
  transition: background var(--transition-slow);
}

.header-inner {
  max-width: var(--container-sm);
  margin: 0 auto;
  padding: var(--space-3) var(--space-4);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.header-logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  flex-shrink: 0;
}

.header-logo-icon {
  width: 38px;
  height: 38px;
  background: linear-gradient(135deg, var(--primary-500), var(--primary-700));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.15rem;
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
  flex-shrink: 0;
  transition: transform var(--transition-normal);
}

.header-logo:hover .header-logo-icon {
  transform: scale(1.05) rotate(-5deg);
}

.header-logo-text {
  font-size: var(--text-xl);
  font-weight: 700;
  background: linear-gradient(135deg, var(--primary-600), var(--primary-400));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  white-space: nowrap;
}

/* ===== 7.2 主题切换 ===== */

.theme-toggle {
  display: flex;
  align-items: center;
  gap: 2px;
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  padding: 3px;
  flex-shrink: 0;
  backdrop-filter: blur(8px);
}

.theme-toggle-btn {
  width: 36px;
  height: 36px;
  min-height: unset;
  border: none;
  border-radius: 50%;
  background: transparent;
  color: var(--text-tertiary);
  font-size: 1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-normal);
  position: relative;
}

.theme-toggle-btn:hover {
  color: var(--text-primary);
  background: var(--border-color);
}

.theme-toggle-btn.active {
  background: rgba(59, 130, 246, 0.15);
  color: var(--primary-500);
  box-shadow: 0 2px 8px rgba(59, 130, 246, 0.15);
}

.theme-toggle-btn .label {
  display: none;
}

@media (min-width: 480px) {
  .theme-toggle-btn {
    width: auto;
    height: 34px;
    padding: 0 var(--space-3);
    border-radius: var(--radius-full);
    gap: 4px;
    font-size: var(--text-sm);
  }
  .theme-toggle-btn .label {
    display: inline;
  }
}

/* ===== 7.3 字号放大按钮 ===== */

.font-size-toggle {
  min-height: 40px;
  padding: var(--space-1) var(--space-3);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  background: var(--card-bg);
  color: var(--text-secondary);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  transition: all var(--transition-fast);
  flex-shrink: 0;
  backdrop-filter: blur(8px);
  position: relative;
  white-space: nowrap;
}

.font-size-toggle:hover {
  border-color: var(--primary-300);
  color: var(--primary-500);
  background: rgba(59, 130, 246, 0.06);
}

.font-size-toggle:active {
  transform: scale(0.96);
}

.font-size-toggle .size-icon {
  font-size: var(--text-lg);
  font-weight: 800;
  font-family: "Times New Roman", serif;
  line-height: 1;
}

.font-size-toggle .size-text {
  font-size: var(--text-sm);
  font-weight: 500;
  line-height: 1;
}

.font-size-toggle .size-badge {
  position: absolute;
  top: -4px;
  right: -6px;
  min-width: 18px;
  height: 18px;
  padding: 0 4px;
  border-radius: var(--radius-full);
  background: var(--primary-500);
  color: white;
  font-size: 0.65rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 6px rgba(59, 130, 246, 0.3);
  opacity: 0;
  transform: scale(0.5);
  transition: all var(--transition-fast);
}

.font-size-toggle .size-badge.show {
  opacity: 1;
  transform: scale(1);
}

@media (max-width: 479px) {
  .font-size-toggle {
    min-height: 36px;
    padding: var(--space-1) var(--space-2);
  }
  .font-size-toggle .size-text {
    font-size: var(--text-xs);
  }
}

/* ===== 7.4 英雄区域 ===== */

.hero {
  text-align: center;
  padding: var(--space-6) 0 var(--space-6);
}

.hero-icon {
  font-size: 3.5rem;
  margin-bottom: var(--space-3);
  display: block;
  animation: float 4s ease-in-out infinite;
  filter: drop-shadow(0 8px 24px rgba(59, 130, 246, 0.2));
}

.hero h1 {
  font-size: var(--text-5xl);
  background: linear-gradient(135deg, var(--primary-600) 0%, var(--primary-400) 50%, var(--coral-500) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--space-3);
  letter-spacing: -0.03em;
  line-height: 1.2;
}

.hero p {
  font-size: var(--text-xl);
  color: var(--text-secondary);
  max-width: 480px;
  margin: 0 auto;
  line-height: 1.6;
}

/* ===== 7.4 快速症状选择 ===== */

.quick-symptoms {
  max-width: var(--container-sm);
  margin: 0 auto var(--space-5);
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-xl);
  padding: var(--space-4) var(--space-5);
  backdrop-filter: blur(16px);
  box-shadow: var(--card-shadow);
  transition: background var(--transition-slow), box-shadow var(--transition-slow);
}

.quick-symptoms-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-3);
}

.quick-symptoms-header h2 {
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--text-primary);
}

.symptom-categories {
  display: flex;
  gap: var(--space-2);
  overflow-x: auto;
  padding-bottom: var(--space-2);
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

.symptom-categories::-webkit-scrollbar {
  display: none;
}

.category-btn {
  flex-shrink: 0;
  min-height: 38px;
  padding: var(--space-1) var(--space-4);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  background: transparent;
  color: var(--text-secondary);
  font-size: var(--text-sm);
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.category-btn:hover {
  border-color: var(--primary-300);
  color: var(--primary-600);
  background: rgba(59, 130, 246, 0.06);
}

.category-btn.active {
  background: linear-gradient(135deg, var(--primary-500), var(--primary-600));
  border-color: transparent;
  color: white;
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

.symptom-chips {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-3);
  min-height: 40px;
}

.symptom-chip {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-4);
  background: var(--symptom-chip-bg);
  border: 1px solid transparent;
  border-radius: var(--radius-full);
  color: var(--primary-700);
  font-size: var(--text-base);
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  user-select: none;
  -webkit-user-select: none;
  white-space: nowrap;
}

.symptom-chip:hover {
  background: var(--symptom-chip-hover);
  border-color: var(--primary-200);
  transform: translateY(-1px);
}

.symptom-chip:active {
  transform: translateY(0);
}

.symptom-chip.selected {
  background: linear-gradient(135deg, var(--primary-500), var(--primary-600));
  border-color: transparent;
  color: white;
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

.symptom-chip .chip-icon {
  font-size: 1rem;
  line-height: 1;
}

/* ===== 7.5 表单 ===== */

.form-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  max-width: var(--container-sm);
  margin: 0 auto var(--space-5);
  backdrop-filter: blur(16px);
  box-shadow: var(--card-shadow);
  transition: background var(--transition-slow), box-shadow var(--transition-slow);
}

.form-group {
  margin-bottom: var(--space-5);
}

.form-group:last-of-type {
  margin-bottom: var(--space-6);
}

.form-label {
  display: block;
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-2);
}

.form-label-icon {
  margin-right: var(--space-1);
}

.input-wrapper {
  position: relative;
  display: flex;
  align-items: flex-end;
  gap: var(--space-2);
}

.input-wrapper textarea {
  flex: 1;
}

textarea,
input,
select {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  background: var(--input-bg);
  border: 2px solid var(--input-border);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: var(--text-lg);
  font-family: inherit;
  transition: all var(--transition-normal);
  -webkit-appearance: none;
  appearance: none;
}

textarea:focus,
input:focus,
select:focus {
  outline: none;
  border-color: var(--input-focus-border);
  box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.12);
}

textarea::placeholder,
input::placeholder {
  color: var(--text-tertiary);
}

select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%2394a3b8' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  background-size: 18px;
  padding-right: 44px;
  cursor: pointer;
}

[data-theme="dark"] select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%2364748b' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
}

textarea {
  resize: vertical;
  min-height: 100px;
  line-height: 1.6;
}

.form-hint {
  margin-top: var(--space-1);
  font-size: var(--text-sm);
  color: var(--text-tertiary);
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

/* 语音按钮 */
.voice-btn {
  flex-shrink: 0;
  width: 56px;
  height: 56px;
  min-height: unset;
  border-radius: var(--radius-md);
  border: 2px solid var(--input-border);
  background: var(--input-bg);
  color: var(--text-tertiary);
  font-size: 1.5rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-normal);
  position: relative;
}

.voice-btn:hover {
  border-color: var(--primary-300);
  color: var(--primary-500);
  background: rgba(59, 130, 246, 0.06);
}

.voice-btn:active {
  transform: scale(0.92);
}

.voice-btn.listening {
  border-color: var(--coral-500);
  color: var(--coral-500);
  background: rgba(244, 63, 94, 0.06);
  animation: pulseRing 1.5s ease-in-out infinite;
}

.voice-btn .voice-tooltip {
  position: absolute;
  bottom: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%);
  background: var(--gray-800);
  color: white;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-sm);
  font-size: var(--text-xs);
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-fast);
}

.voice-btn:hover .voice-tooltip {
  opacity: 1;
}

[data-theme="dark"] .voice-btn:hover {
  background: rgba(59, 130, 246, 0.1);
}

[data-theme="dark"] .voice-btn.listening {
  background: rgba(244, 63, 94, 0.1);
}

/* ===== 7.6 按钮 ===== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-size: var(--text-lg);
  font-weight: 600;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all var(--transition-normal);
  min-height: 56px;
  text-decoration: none;
  white-space: nowrap;
  user-select: none;
  -webkit-user-select: none;
  line-height: 1.4;
  position: relative;
  overflow: hidden;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none !important;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary-500), var(--primary-700));
  color: white;
  box-shadow: 0 6px 20px rgba(37, 99, 235, 0.4);
  width: 100%;
  font-size: var(--text-xl);
  min-height: 64px;
  border-radius: var(--radius-lg);
}

.btn-primary::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, transparent 40%, rgba(255,255,255,0.12) 100%);
  pointer-events: none;
}

.btn-primary:hover:not(:disabled) {
  transform: translateY(-3px);
  box-shadow: 0 10px 30px rgba(37, 99, 235, 0.5);
}

.btn-primary:active:not(:disabled) {
  transform: translateY(-1px);
}

.btn-secondary {
  background: var(--card-bg);
  color: var(--primary-600);
  border: 1px solid var(--border-color);
  width: 100%;
  font-size: var(--text-lg);
  min-height: 56px;
  border-radius: var(--radius-lg);
  backdrop-filter: blur(8px);
}

.btn-secondary:hover:not(:disabled) {
  background: rgba(59, 130, 246, 0.08);
  border-color: var(--primary-300);
  transform: translateY(-1px);
}

.btn-icon {
  width: 44px;
  height: 44px;
  min-height: unset;
  padding: 0;
  border-radius: 50%;
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  color: var(--text-tertiary);
  font-size: 1.15rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
  backdrop-filter: blur(8px);
}

.btn-icon:hover {
  background: var(--border-color);
  color: var(--text-primary);
  transform: rotate(180deg);
}

/* ===== 7.7 卡片 ===== */

.card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  backdrop-filter: blur(16px);
  box-shadow: var(--card-shadow);
  transition: background var(--transition-slow),
              box-shadow var(--transition-slow),
              transform var(--transition-normal);
}

/* ===== 7.8 结果页 ===== */

.result-header {
  text-align: center;
  margin-bottom: var(--space-5);
  padding-bottom: var(--space-5);
  border-bottom: 1px solid var(--border-color);
}

.result-header-icon {
  font-size: 2.5rem;
  margin-bottom: var(--space-2);
  display: block;
}

.result-header h1 {
  font-size: var(--text-3xl);
  background: linear-gradient(135deg, var(--primary-600), var(--primary-400));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--space-1);
}

.result-header p {
  font-size: var(--text-base);
  color: var(--text-secondary);
}

.result-section {
  padding: var(--space-4) 0;
}

.result-section + .result-section {
  border-top: 1px solid var(--border-color);
}

.result-section-title {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: var(--space-2);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.result-section-content {
  font-size: var(--text-xl);
  color: var(--text-primary);
  line-height: 1.6;
}

/* 科室推荐卡片 */
.department-result {
  background: linear-gradient(135deg, var(--primary-500), var(--primary-800));
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  text-align: center;
  position: relative;
  overflow: hidden;
  margin: var(--space-2) 0;
}

.department-result::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 20% 20%, rgba(255,255,255,0.15) 0%, transparent 50%),
    radial-gradient(circle at 80% 80%, rgba(255,255,255,0.08) 0%, transparent 50%);
  pointer-events: none;
}

.department-result::after {
  content: '🏥';
  position: absolute;
  right: -20px;
  bottom: -20px;
  font-size: 8rem;
  opacity: 0.08;
  pointer-events: none;
}

.department-result-icon {
  font-size: 2rem;
  margin-bottom: var(--space-2);
  display: block;
  position: relative;
}

.department-result-label {
  font-size: var(--text-sm);
  color: rgba(255, 255, 255, 0.7);
  margin-bottom: var(--space-2);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 500;
}

.department-result-name {
  font-size: var(--text-4xl);
  font-weight: 800;
  color: white;
  letter-spacing: 0.02em;
  text-shadow: 0 2px 16px rgba(0, 0, 0, 0.2);
  position: relative;
}

/* 症状标签 */
.symptom-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-1);
}

.symptom-tag {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-3);
  background: var(--symptom-chip-bg);
  border-radius: var(--radius-full);
  color: var(--primary-700);
  font-size: var(--text-base);
  font-weight: 500;
}

/* 风险等级 */
.risk-display {
  text-align: center;
  padding: var(--space-3);
}

.risk-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-full);
  font-size: var(--text-2xl);
  font-weight: 700;
  min-width: 160px;
  justify-content: center;
}

.risk-low {
  background: linear-gradient(135deg, #dcfce7, #bbf7d0);
  color: var(--success-700);
  border: 2px solid var(--success-500);
  box-shadow: 0 4px 16px rgba(34, 197, 94, 0.2);
}

.risk-medium {
  background: linear-gradient(135deg, #fef3c7, #fde68a);
  color: var(--warning-700);
  border: 2px solid var(--warning-500);
  box-shadow: 0 4px 16px rgba(245, 158, 11, 0.2);
}

.risk-high {
  background: linear-gradient(135deg, #fee2e2, #fecaca);
  color: var(--danger-700);
  border: 2px solid var(--danger-500);
  box-shadow: 0 4px 16px rgba(239, 68, 68, 0.2);
}

[data-theme="dark"] .risk-low {
  background: rgba(34, 197, 94, 0.15);
  color: #86efac;
  border-color: var(--success-500);
}

[data-theme="dark"] .risk-medium {
  background: rgba(245, 158, 11, 0.15);
  color: #fde68a;
  border-color: var(--warning-500);
}

[data-theme="dark"] .risk-high {
  background: rgba(239, 68, 68, 0.15);
  color: #fca5a5;
  border-color: var(--danger-500);
}

.risk-description {
  margin-top: var(--space-3);
  font-size: var(--text-base);
  color: var(--text-secondary);
}

/* ===== 7.9 急诊警报 ===== */

.emergency-alert {
  background: linear-gradient(135deg, #dc2626, #b91c1c);
  border: none;
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  color: white;
  text-align: center;
  margin-bottom: var(--space-6);
  animation: emergencyPulse 2s ease-in-out infinite;
  position: relative;
  overflow: hidden;
}

.emergency-alert::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 70% 20%, rgba(255,255,255,0.12) 0%, transparent 60%);
  pointer-events: none;
}

.emergency-alert-icon {
  font-size: 3rem;
  margin-bottom: var(--space-3);
  display: block;
  animation: alertShake 0.8s ease-in-out infinite;
}

.emergency-alert h2 {
  font-size: var(--text-3xl);
  font-weight: 800;
  color: white;
  margin-bottom: var(--space-2);
}

.emergency-alert p {
  font-size: var(--text-lg);
  color: rgba(255, 255, 255, 0.9);
  line-height: 1.6;
}

.emergency-alert .emergency-actions {
  margin-top: var(--space-4);
}

.emergency-alert .emergency-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-full);
  font-size: var(--text-lg);
  font-weight: 600;
  border: 2px solid rgba(255, 255, 255, 0.7);
  background: rgba(255, 255, 255, 0.12);
  color: white;
  cursor: pointer;
  transition: all var(--transition-normal);
  text-decoration: none;
  backdrop-filter: blur(4px);
}

.emergency-alert .emergency-btn:hover {
  background: rgba(255, 255, 255, 0.2);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
}

/* ===== 7.10 历史记录 ===== */

.history-section {
  max-width: var(--container-sm);
  margin: 0 auto var(--space-5);
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-xl);
  padding: var(--space-4) var(--space-5);
  backdrop-filter: blur(16px);
  box-shadow: var(--card-shadow);
  transition: background var(--transition-slow), box-shadow var(--transition-slow);
}

.history-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  min-height: 60px;
}

.history-item {
  background: var(--input-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--space-3) var(--space-4);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.history-item:hover {
  border-color: var(--primary-200);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
  transform: translateX(4px);
}

.history-item-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--space-3);
  margin-bottom: var(--space-1);
}

.history-item-symptoms {
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--text-primary);
  display: -webkit-box;
  -webkit-line-clamp: 1;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.history-item-dept {
  font-size: var(--text-sm);
  color: var(--primary-600);
  white-space: nowrap;
  flex-shrink: 0;
  padding: 2px var(--space-2);
  background: var(--symptom-chip-bg);
  border-radius: var(--radius-sm);
  font-weight: 500;
}

.history-item-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.history-item-date {
  font-size: var(--text-sm);
  color: var(--text-tertiary);
}

.history-item-risk {
  font-size: var(--text-xs);
  font-weight: 600;
  padding: 2px var(--space-2);
  border-radius: var(--radius-sm);
}

.history-empty {
  text-align: center;
  padding: var(--space-6);
  color: var(--text-tertiary);
}

.history-empty-icon {
  font-size: 2.5rem;
  margin-bottom: var(--space-2);
  display: block;
  opacity: 0.4;
}

.history-empty p {
  font-size: var(--text-base);
}

/* ===== 7.11 加载状态 ===== */

.loading-overlay {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 200;
  background: rgba(0, 0, 0, 0.2);
  backdrop-filter: blur(8px);
  align-items: center;
  justify-content: center;
}

.loading-overlay.active {
  display: flex;
  animation: fadeIn 0.2s ease;
}

.loading-spinner {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-2xl);
  padding: var(--space-8);
  text-align: center;
  backdrop-filter: blur(24px);
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.15);
  max-width: 280px;
  width: 90%;
}

.spinner {
  width: 48px;
  height: 48px;
  border: 3px solid var(--border-color);
  border-top-color: var(--primary-500);
  border-radius: 50%;
  animation: spin 0.8s cubic-bezier(0.6, 0, 0.4, 1) infinite;
  margin: 0 auto var(--space-4);
}

.loading-spinner p {
  font-size: var(--text-lg);
  color: var(--text-primary);
  font-weight: 500;
}

/* 按钮加载态 */
.btn-loading {
  pointer-events: none;
  opacity: 0.85;
}

.btn-loading .btn-text {
  visibility: hidden;
}

.btn-loading::before {
  content: '';
  position: absolute;
  width: 24px;
  height: 24px;
  border: 3px solid rgba(255, 255, 255, 0.3);
  border-top-color: white;
  border-radius: 50%;
  animation: spin 0.8s cubic-bezier(0.6, 0, 0.4, 1) infinite;
}

/* ===== 7.12 提示框 ===== */

.tip-box {
  background: rgba(255, 251, 235, 0.8);
  border: 1px solid rgba(251, 191, 36, 0.3);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  backdrop-filter: blur(8px);
}

.tip-box-header {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-3);
}

.tip-box-header-icon {
  font-size: 1.3rem;
}

.tip-box-header h3 {
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--warning-700);
}

.tip-box ul {
  list-style: none;
  padding: 0;
}

.tip-box li {
  font-size: var(--text-base);
  color: var(--warning-700);
  padding: var(--space-1) 0;
  display: flex;
  align-items: flex-start;
  gap: var(--space-2);
  line-height: 1.5;
}

.tip-box li::before {
  content: '•';
  color: var(--warning-500);
  font-weight: bold;
  flex-shrink: 0;
}

[data-theme="dark"] .tip-box {
  background: rgba(251, 191, 36, 0.06);
  border-color: rgba(251, 191, 36, 0.15);
}

[data-theme="dark"] .tip-box-header h3 {
  color: var(--warning-500);
}

[data-theme="dark"] .tip-box li {
  color: var(--warning-200);
}

/* 温馨提示 */
.info-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-xl);
  padding: var(--space-5);
  max-width: var(--container-sm);
  margin: 0 auto var(--space-5);
  backdrop-filter: blur(16px);
  box-shadow: var(--card-shadow);
}

.info-card-header {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-3);
}

.info-card-header-icon {
  font-size: 1.3rem;
}

.info-card-header h3 {
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--primary-600);
}

.info-card ul {
  list-style: none;
  padding: 0;
}

.info-card li {
  font-size: var(--text-base);
  color: var(--text-secondary);
  padding: var(--space-1) 0;
  display: flex;
  align-items: flex-start;
  gap: var(--space-2);
  line-height: 1.5;
}

.info-card li::before {
  content: '💡';
  font-size: 0.85rem;
}

/* ===== 操作栏（多页导航） ===== */

.action-bar {
  display: flex;
  gap: var(--space-3);
  margin-bottom: var(--space-5);
}

.action-bar .btn {
  min-height: 52px;
  font-size: var(--text-base);
}

/* ===== 底部导航链接 ===== */

.bottom-nav {
  max-width: var(--container-sm);
  margin: 0 auto var(--space-5);
}

.bottom-nav-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-5);
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(16px);
  box-shadow: var(--card-shadow);
  text-decoration: none;
  color: var(--text-primary);
  font-size: var(--text-lg);
  font-weight: 500;
  transition: all var(--transition-fast);
}

.bottom-nav-item:hover {
  border-color: var(--primary-200);
  box-shadow: var(--card-shadow-hover);
  transform: translateY(-2px);
  text-decoration: none;
}

.bottom-nav-arrow {
  margin-left: auto;
  color: var(--text-tertiary);
  font-size: var(--text-xl);
  transition: transform var(--transition-fast);
}

.bottom-nav-item:hover .bottom-nav-arrow {
  transform: translateX(4px);
  color: var(--primary-500);
}

/* ============================================
   8. 动画与过渡
   ============================================ */

@keyframes pageEnter {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}

@keyframes blobFloat1 {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(60px, 40px) scale(1.1); }
  66% { transform: translate(-30px, 20px) scale(0.9); }
}

@keyframes blobFloat2 {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(-50px, -30px) scale(1.15); }
  66% { transform: translate(40px, -20px) scale(0.95); }
}

@keyframes blobFloat3 {
  0%, 100% { transform: translate(-50%, -50%) scale(1); }
  50% { transform: translate(-50%, -50%) scale(1.2); }
}

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

@keyframes emergencyPulse {
  0%, 100% {
    box-shadow: 0 0 0 0 rgba(220, 38, 38, 0.5);
  }
  50% {
    box-shadow: 0 0 0 24px rgba(220, 38, 38, 0);
  }
}

@keyframes alertShake {
  0%, 100% { transform: rotate(0deg); }
  20% { transform: rotate(-8deg); }
  40% { transform: rotate(8deg); }
  60% { transform: rotate(-5deg); }
  80% { transform: rotate(5deg); }
}

@keyframes pulseRing {
  0%, 100% {
    box-shadow: 0 0 0 0 rgba(244, 63, 94, 0.4);
  }
  50% {
    box-shadow: 0 0 0 16px rgba(244, 63, 94, 0);
  }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}

.animate-slide-up {
  animation: slideUp 0.4s ease forwards;
}

.animate-fade-in {
  animation: fadeIn 0.3s ease forwards;
}

.delay-1 { animation-delay: 0.05s; }
.delay-2 { animation-delay: 0.1s; }
.delay-3 { animation-delay: 0.15s; }
.delay-4 { animation-delay: 0.2s; }

/* ============================================
   9. 响应式设计
   ============================================ */

/* 小屏手机 */
@media (max-width: 479px) {
  .hero h1 {
    font-size: var(--text-4xl);
  }
  .hero p {
    font-size: var(--text-lg);
  }
  .department-result-name {
    font-size: var(--text-3xl);
  }
  .risk-badge {
    font-size: var(--text-xl);
    padding: var(--space-2) var(--space-4);
    min-width: 120px;
  }
  .header-logo-text {
    font-size: var(--text-lg);
  }
  .header-logo-icon {
    width: 34px;
    height: 34px;
    font-size: 1rem;
  }
  .quick-symptoms,
  .history-section {
    padding: var(--space-3) var(--space-4);
  }
}

/* 平板 */
@media (min-width: 768px) {
  .page {
    padding: var(--space-8) var(--space-8) var(--space-12);
    padding-top: calc(68px + var(--space-8));
  }
  .form-card {
    padding: var(--space-8);
  }
  .card {
    padding: var(--space-8);
  }
  .hero {
    padding: var(--space-8) 0 var(--space-6);
  }
  .hero h1 {
    font-size: var(--text-6xl);
  }
  .hero p {
    font-size: var(--text-2xl);
  }
  .department-result {
    padding: var(--space-8);
  }
  .department-result-name {
    font-size: var(--text-5xl);
  }
  .emergency-alert {
    padding: var(--space-8);
  }
  .emergency-alert h2 {
    font-size: var(--text-4xl);
  }
  .symptom-chips {
    gap: var(--space-3);
  }
  .symptom-chip {
    padding: var(--space-1) var(--space-5);
    font-size: var(--text-lg);
  }
  .bg-blob-1 {
    width: 600px;
    height: 600px;
  }
  .bg-blob-2 {
    width: 500px;
    height: 500px;
  }
}

/* 桌面 */
@media (min-width: 1024px) {
  .page {
    padding: var(--space-12);
    padding-top: calc(68px + var(--space-12));
  }
  .form-card {
    padding: var(--space-10);
  }
  .header-inner {
    max-width: var(--container-md);
  }
}

/* 减少运动 */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  html { scroll-behavior: auto; }
}

/* ============================================
   10. 工具类
   ============================================ */

.text-center { text-align: center; }
.font-bold { font-weight: 700; }
.text-sm { font-size: var(--text-sm); }
.text-base { font-size: var(--text-base); }
.text-lg { font-size: var(--text-lg); }
.text-xl { font-size: var(--text-xl); }
.text-2xl { font-size: var(--text-2xl); }
.mt-2 { margin-top: var(--space-2); }
.mt-4 { margin-top: var(--space-4); }
.mb-4 { margin-bottom: var(--space-4); }
.flex { display: flex; }
.gap-2 { gap: var(--space-2); }
.w-full { width: 100%; }

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}