/**
 * ============================================================
 * UI CSS 样式体系 — 基于beianhealth品牌主色 #BEFF50
 * 版本：1.0.0
 * 设计原则：清晰、现代、高可访问性、富有活力
 * ============================================================
 */

/* ============================================================
   1. 设计令牌 (Design Tokens)
   ============================================================ */
:root {
  /* ----- 品牌色 ----- */
  --color-brand-primary: #BEFF50;
  --color-brand-primary-rgb: 190, 255, 80;
  --color-brand-dark: #8FCC2E;
  --color-brand-light: #D4FF8A;
  --color-brand-bg: #F2FFE0;

  /* ----- 中性色 ----- */
  --color-gray-50: #F9FAFB;
  --color-gray-100: #F3F4F6;
  --color-gray-200: #E5E7EB;
  --color-gray-300: #D1D5DB;
  --color-gray-400: #9CA3AF;
  --color-gray-500: #6B7280;
  --color-gray-600: #4B5563;
  --color-gray-700: #374151;
  --color-gray-800: #1F2937;
  --color-gray-900: #111827;
  --color-gray-950: #030712;

  /* ----- 语义色 ----- */
  --color-success: #10B981;
  --color-warning: #F59E0B;
  --color-error: #EF4444;
  --color-info: #3B82F6;

  /* ----- 背景 & 文本 ----- */
  --color-bg: #FFFFFF;
  --color-bg-secondary: var(--color-gray-50);
  --color-text: var(--color-gray-900);
  --color-text-secondary: var(--color-gray-600);
  --color-text-inverse: var(--color-gray-950);

  /* ----- 边框 & 阴影 ----- */
  --color-border: var(--color-gray-200);
  --color-border-focus: var(--color-brand-primary);
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.12);
  --shadow-focus: 0 0 0 3px rgba(var(--color-brand-primary-rgb), 0.4);

  /* ----- 圆角 & 间距 ----- */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-full: 9999px;

  --spacing-1: 4px;
  --spacing-2: 8px;
  --spacing-3: 12px;
  --spacing-4: 16px;
  --spacing-5: 24px;
  --spacing-6: 32px;
  --spacing-7: 48px;
  --spacing-8: 64px;

  /* ----- 排版 ----- */
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-size-xs: 0.75rem;   /* 12px */
  --font-size-sm: 0.875rem;  /* 14px */
  --font-size-base: 1rem;    /* 16px */
  --font-size-lg: 1.125rem;  /* 18px */
  --font-size-xl: 1.25rem;   /* 20px */
  --font-size-2xl: 1.5rem;   /* 24px */
  --font-size-3xl: 2rem;     /* 32px */

  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

  --line-height-tight: 1.25;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;

  /* ----- 过渡 ----- */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 350ms ease;
}

/* ============================================================
   2. 暗色模式 (Dark Mode)
   ============================================================ */
@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: var(--color-gray-950);
    --color-bg-secondary: var(--color-gray-900);
    --color-text: var(--color-gray-50);
    --color-text-secondary: var(--color-gray-400);
    --color-text-inverse: var(--color-gray-50);
    --color-border: var(--color-gray-700);
    --color-brand-bg: #1A2A0A;

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.5);
  }
}

/* ============================================================
   3. 全局重置 & 基础样式
   ============================================================ */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--color-brand-dark);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

/* ============================================================
   4. 按钮 (Button)
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-2);
  padding: 0.625rem 1.25rem;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  line-height: var(--line-height-tight);
  border: 2px solid transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-base);
  text-align: center;
  white-space: nowrap;
  user-select: none;
  background-color: transparent;
  color: var(--color-text);
}

/* 主要按钮 — 品牌色 */
.btn-primary {
  background-color: var(--color-brand-primary);
  color: var(--color-text-inverse);
  border-color: var(--color-brand-primary);
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
  background-color: var(--color-brand-dark);
  border-color: var(--color-brand-dark);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-primary:focus-visible {
  outline: none;
  box-shadow: var(--shadow-focus);
}

.btn-primary:active {
  transform: translateY(0);
  box-shadow: var(--shadow-sm);
}

/* 次要按钮 — 边框品牌色 */
.btn-secondary {
  background-color: transparent;
  color: var(--color-brand-dark);
  border-color: var(--color-brand-primary);
}

.btn-secondary:hover {
  background-color: var(--color-brand-bg);
  border-color: var(--color-brand-dark);
  color: var(--color-brand-dark);
}

.btn-secondary:focus-visible {
  outline: none;
  box-shadow: var(--shadow-focus);
}

/* 幽灵按钮 — 纯文本 */
.btn-ghost {
  color: var(--color-text-secondary);
  border-color: transparent;
}

.btn-ghost:hover {
  background-color: var(--color-gray-100);
  color: var(--color-text);
}

@media (prefers-color-scheme: dark) {
  .btn-ghost:hover {
    background-color: var(--color-gray-800);
  }
}

/* 按钮尺寸 */
.btn-sm {
  padding: 0.375rem 0.75rem;
  font-size: var(--font-size-xs);
}

.btn-lg {
  padding: 0.75rem 1.5rem;
  font-size: var(--font-size-base);
}

/* 禁用状态 */
.btn:disabled {
  opacity: 0.5;
  pointer-events: none;
  transform: none !important;
}

/* ============================================================
   5. 卡片 (Card)
   ============================================================ */
.card {
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-5);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-base), transform var(--transition-base);
}

.card:hover {
  box-shadow: var(--shadow-md);
}

.card-brand {
  border-top: 4px solid var(--color-brand-primary);
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--spacing-4);
}

.card-title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text);
}

.card-subtitle {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.card-body {
  color: var(--color-text-secondary);
}

.card-footer {
  margin-top: var(--spacing-4);
  padding-top: var(--spacing-4);
  border-top: 1px solid var(--color-border);
}

/* ============================================================
   6. 表单 (Form)
   ============================================================ */
.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-1);
  margin-bottom: var(--spacing-4);
}

.form-label {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text);
}

.form-label .required {
  color: var(--color-error);
  margin-left: var(--spacing-1);
}

.form-control {
  padding: 0.625rem 0.875rem;
  font-size: var(--font-size-base);
  font-family: inherit;
  line-height: var(--line-height-normal);
  color: var(--color-text);
  background-color: var(--color-bg);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  width: 100%;
  appearance: none;
}

.form-control:focus {
  outline: none;
  border-color: var(--color-brand-primary);
  box-shadow: var(--shadow-focus);
}

.form-control::placeholder {
  color: var(--color-gray-400);
}

.form-control:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.form-control-error {
  border-color: var(--color-error);
}

.form-control-error:focus {
  border-color: var(--color-error);
  box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.3);
}

.form-hint {
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
}

.form-error {
  font-size: var(--font-size-xs);
  color: var(--color-error);
}

/* 复选框 & 单选框 */
.form-check {
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
  margin-bottom: var(--spacing-2);
}

.form-check-input {
  width: 1.125rem;
  height: 1.125rem;
  accent-color: var(--color-brand-primary);
  cursor: pointer;
  flex-shrink: 0;
}

.form-check-label {
  font-size: var(--font-size-sm);
  color: var(--color-text);
  cursor: pointer;
}

/* ============================================================
   7. 徽章 (Badge)
   ============================================================ */
.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-1);
  padding: 0.25rem 0.625rem;
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  line-height: var(--line-height-tight);
  border-radius: var(--radius-full);
  background-color: var(--color-gray-100);
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.025em;
}

.badge-brand {
  background-color: var(--color-brand-primary);
  color: var(--color-text-inverse);
}

.badge-success {
  background-color: #D1FAE5;
  color: #065F46;
}

.badge-warning {
  background-color: #FEF3C7;
  color: #92400E;
}

.badge-error {
  background-color: #FEE2E2;
  color: #991B1B;
}

@media (prefers-color-scheme: dark) {
  .badge-success {
    background-color: #064E3B;
    color: #A7F3D0;
  }
  .badge-warning {
    background-color: #78350F;
    color: #FDE68A;
  }
  .badge-error {
    background-color: #7F1D1D;
    color: #FCA5A5;
  }
}

/* ============================================================
   8. 导航 (Navigation)
   ============================================================ */
.nav {
  display: flex;
  align-items: center;
  gap: var(--spacing-4);
  padding: var(--spacing-4) var(--spacing-6);
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text);
}

.nav-brand .brand-dot {
  display: inline-block;
  width: 12px;
  height: 12px;
  border-radius: var(--radius-full);
  background-color: var(--color-brand-primary);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
  margin-left: auto;
  list-style: none;
}

.nav-link {
  padding: 0.375rem 0.75rem;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.nav-link:hover {
  color: var(--color-text);
  background-color: var(--color-gray-100);
}

.nav-link-active {
  color: var(--color-brand-dark);
  background-color: var(--color-brand-bg);
}

@media (prefers-color-scheme: dark) {
  .nav-link:hover {
    background-color: var(--color-gray-800);
  }
  .nav-link-active {
    background-color: #1A2A0A;
  }
}

/* ============================================================
   9. 提示框 (Alert)
   ============================================================ */
.alert {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-3);
  padding: var(--spacing-4);
  border-radius: var(--radius-md);
  border-left: 4px solid transparent;
  background-color: var(--color-bg-secondary);
  color: var(--color-text);
}

.alert-icon {
  flex-shrink: 0;
  margin-top: 1px;
  font-size: var(--font-size-lg);
}

.alert-content {
  flex: 1;
}

.alert-title {
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--spacing-1);
}

.alert-message {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.alert-brand {
  border-left-color: var(--color-brand-primary);
  background-color: var(--color-brand-bg);
}

.alert-success {
  border-left-color: var(--color-success);
  background-color: #ECFDF5;
}

.alert-warning {
  border-left-color: var(--color-warning);
  background-color: #FFFBEB;
}

.alert-error {
  border-left-color: var(--color-error);
  background-color: #FEF2F2;
}

@media (prefers-color-scheme: dark) {
  .alert-success {
    background-color: #064E3B;
  }
  .alert-warning {
    background-color: #78350F;
  }
  .alert-error {
    background-color: #7F1D1D;
  }
}

/* ============================================================
   10. 标签页 (Tabs)
   ============================================================ */
.tabs {
  display: flex;
  gap: var(--spacing-1);
  border-bottom: 2px solid var(--color-border);
  margin-bottom: var(--spacing-4);
}

.tab {
  padding: 0.625rem 1.25rem;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  border: none;
  background: transparent;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  transition: all var(--transition-fast);
  border-radius: 0;
}

.tab:hover {
  color: var(--color-text);
}

.tab-active {
  color: var(--color-brand-dark);
  border-bottom-color: var(--color-brand-primary);
}

.tab:focus-visible {
  outline: none;
  box-shadow: var(--shadow-focus);
  border-radius: var(--radius-sm);
}

/* ============================================================
   11. 进度条 (Progress)
   ============================================================ */
.progress {
  width: 100%;
  height: 8px;
  background-color: var(--color-gray-200);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress-bar {
  height: 100%;
  background-color: var(--color-brand-primary);
  border-radius: var(--radius-full);
  transition: width var(--transition-slow);
  width: 0%;
}

.progress-bar-striped {
  background-image: linear-gradient(45deg, rgba(255, 255, 255, 0.15) 25%, transparent 25%, transparent 50%, rgba(255, 255, 255, 0.15) 50%, rgba(255, 255, 255, 0.15) 75%, transparent 75%, transparent);
  background-size: 1rem 1rem;
}

/* ============================================================
   12. 工具类 (Utilities)
   ============================================================ */
/* 品牌色工具 */
.bg-brand {
  background-color: var(--color-brand-primary);
}
.bg-brand-light {
  background-color: var(--color-brand-bg);
}
.text-brand {
  color: var(--color-brand-primary);
}
.text-brand-dark {
  color: var(--color-brand-dark);
}
.border-brand {
  border-color: var(--color-brand-primary);
}

/* 布局工具 */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-4);
}

.flex {
  display: flex;
}
.flex-col {
  flex-direction: column;
}
.items-center {
  align-items: center;
}
.justify-between {
  justify-content: space-between;
}
.gap-2 {
  gap: var(--spacing-2);
}
.gap-4 {
  gap: var(--spacing-4);
}
.gap-6 {
  gap: var(--spacing-6);
}
.w-full {
  width: 100%;
}
.text-center {
  text-align: center;
}
.mt-4 {
  margin-top: var(--spacing-4);
}
.mb-4 {
  margin-bottom: var(--spacing-4);
}
.p-4 {
  padding: var(--spacing-4);
}

/* 圆角 */
.rounded {
  border-radius: var(--radius-md);
}
.rounded-full {
  border-radius: var(--radius-full);
}

/* 阴影 */
.shadow {
  box-shadow: var(--shadow-md);
}

/* 屏幕阅读器辅助 */
.sr-only {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

/* ============================================================
   13. 动画 (Animations)
   ============================================================ */
@keyframes pulse-brand {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0.5;
  }
}

.animate-pulse-brand {
  animation: pulse-brand 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

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

.animate-spin {
  animation: spin 1s linear infinite;
}