/* ============================================
   Couple Peacemaker - 全局样式规范 v2.0
   吵架调解员 | 基于 Tailwind CSS 扩展
   ============================================
   设计体系：
   - 主色：品牌紫 #7c3aed (violet-600)
   - 辅色：靛蓝 indigo-500 / 粉紫 pink-500
   - 功能色：绿(成功) / 橙(警告) / 红(错误)
   - 字体：Inter (Google Fonts CDN)
   - 圆角：xl(0.75rem) / 2xl(1rem) / 3xl(1.5rem)
   - 阴影：多层次卡片阴影
   - 动画：统一缓动曲线 ease-out
   ============================================ */

/* ========== CSS 自定义属性（设计令牌）========== */
:root {
  /* 品牌色系 */
  --brand-primary: #7c3aed;       /* 品牌主色 - 紫罗兰 */
  --brand-primary-light: #a78bfa; /* 浅紫 */
  --brand-primary-dark: #5b21b6;  /* 深紫 */
  --brand-secondary: #6366f1;     /* 靛蓝 */
  --brand-accent: #ec4899;        /* 粉红强调 */

  /* 渐变色 */
  --gradient-hero: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
  --gradient-card: linear-gradient(135deg, #f5f3ff 0%, #ede9fe 100%);
  --gradient-step1: linear-gradient(135deg, #6366f1 0%, #7c3aed 100%);
  --gradient-step2: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);
  --gradient-step3: linear-gradient(135deg, #ec4899 0%, #db2777 100%);
  --gradient-step4: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
  --gradient-step5: linear-gradient(135deg, #10b981 0%, #059669 100%);

  /* 功能色 */
  --color-success: #10b981;
  --color-success-bg: #ecfdf5;
  --color-warning: #f59e0b;
  --color-warning-bg: #fffbeb;
  --color-danger: #ef4444;
  --color-danger-bg: #fef2f2;
  --color-info: #3b82f6;
  --color-info-bg: #eff6ff;

  /* 中性色 */
  --color-text: #1f2937;
  --color-text-muted: #6b7280;
  --color-text-light: #9ca3af;
  --color-bg: #fafafa;
  --color-bg-alt: #f3f4f6;
  --color-border: #e5e7eb;
  --color-border-light: #f3f4f6;

  /* 间距规范 */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;

  /* 圆角 */
  --radius-sm: 0.5rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  --radius-2xl: 2rem;
  --radius-full: 9999px;

  /* 阴影层级 */
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 12px rgba(124,58,237,0.08);
  --shadow-lg: 0 10px 30px rgba(124,58,237,0.12);
  --shadow-xl: 0 20px 50px rgba(124,58,237,0.15);
  --shadow-glow: 0 0 20px rgba(124,58,237,0.15);

  /* 过渡动画 */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --transition-fast: 0.15s var(--ease-out);
  --transition-base: 0.3s var(--ease-out);
  --transition-slow: 0.5s var(--ease-out);

  /* 字体 */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

/* ========== 基础重置 ========== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-size-adjust: 100%;
}

body {
  font-family: var(--font-family);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  overflow-x: hidden;
  min-height: 100vh;
}

/* ========== 排版系统 ========== */
h1, h2, h3, h4, h5, h6 {
  line-height: 1.25;
  font-weight: 800;
  letter-spacing: -0.02em;
}

p { line-height: 1.7; }

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

/* ========== 导航栏样式 ========== */
.nav-fixed {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border-light);
  transition: all var(--transition-base);
}

.nav-link {
  position: relative;
  padding: 0.25rem 0;
  font-weight: 600;
  font-size: 0.875rem;
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
}

.nav-link:hover,
.nav-link.active {
  color: var(--brand-primary);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--brand-primary);
  border-radius: 1px;
  transition: width var(--transition-base);
}

.nav-link:hover::after,
.nav-link.active::after { width: 100%; }

/* 移动端菜单 */
.mobile-menu {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s var(--ease-out);
}

.mobile-menu.open { max-height: 300px; }

/* ========== Hero 区域 ========== */
.hero-section {
  position: relative;
  overflow: hidden;
  background: var(--gradient-hero);
  /* 备用纯色背景，防止渐变不显示 */
  background-color: #667eea;
  min-height: 85vh;
  display: flex;
  align-items: center;
  color: #ffffff; /* 确保默认文字为白色 */
}

/* 装饰性背景元素 */
.hero-decoration {
  position: absolute;
  border-radius: 50%;
  filter: blur(60px);
  opacity: 0.3;
  pointer-events: none;
}

.hero-decoration-1 {
  width: 300px;
  height: 300px;
  background: #a78bfa;
  top: -80px;
  right: -50px;
}

.hero-decoration-2 {
  width: 250px;
  height: 250px;
  background: #f472b6;
  bottom: -60px;
  left: -40px;
}

.hero-decoration-3 {
  width: 180px;
  height: 180px;
  background: #818cf8;
  top: 40%;
  left: 10%;
  opacity: 0.15;
}

/* ========== 步骤进度指示器 ========== */
.step-dots {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
}

.step-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: #d1d5db;
  cursor: pointer;
  transition: all var(--transition-base);
  position: relative;
}

.step-dot::before {
  content: '';
  position: absolute;
  inset: -4px;
  border-radius: 50%;
  border: 2px solid transparent;
  transition: all var(--transition-base);
}

.step-dot:hover { transform: scale(1.2); }

.step-dot.active {
  background: var(--brand-primary);
  box-shadow: 0 0 0 4px rgba(124,58,237,0.2);
  transform: scale(1.15);
}

.step-dot.completed {
  background: var(--color-success);
}

/* 步骤容器过渡 */
.step-container {
  animation: stepFadeIn 0.4s var(--ease-out) forwards;
}

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

/* ========== 卡片组件 ========== */
.card {
  background: white;
  border-radius: var(--radius-xl);
  border: 1px solid var(--color-border-light);
  box-shadow: var(--shadow-md);
  overflow: hidden;
  transition: box-shadow var(--transition-base), transform var(--transition-base);
}

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

.card-header {
  padding: var(--space-lg) var(--space-xl);
  color: white;
  font-weight: 700;
  /* 备用背景色 */
  background-color: #7c3aed;
}

.card-body { padding: var(--space-xl); }

/* 步骤卡片头部渐变（带备用色） */
.card-step1 .card-header { background: var(--gradient-step1); background-color: #6366f1; }
.card-step2 .card-header { background: var(--gradient-step2); background-color: #3b82f6; }
.card-step3 .card-header { background: var(--gradient-step3); background-color: #ec4899; }
.card-step4 .card-header { background: var(--gradient-step4); background-color: #f59e0b; }
.card-step5 .card-header { background: var(--gradient-step5); background-color: #10b981; }

/* ========== 表单元素 ========== */
.form-input {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-family: inherit;
  color: var(--color-text);
  background: white;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-input:focus {
  outline: none;
  border-color: var(--brand-primary);
  box-shadow: 0 0 0 3px rgba(124,58,237,0.15);
}

.form-input::placeholder { color: var(--color-text-light); }

.form-input.error {
  border-color: var(--color-danger);
  box-shadow: 0 0 0 3px rgba(239,68,68,0.1);
}

/* 下拉选择框 */
.form-select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%236b7280' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 1rem center;
  padding-right: 2.5rem !important;
  cursor: pointer;
}

/* 滑块样式 */
.range-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 8px;
  border-radius: 4px;
  outline: none;
  cursor: pointer;
}

.range-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--brand-primary);
  border: 3px solid white;
  box-shadow: var(--shadow-md);
  cursor: pointer;
  transition: transform var(--transition-fast);
}

.range-slider::-webkit-slider-thumb:hover {
  transform: scale(1.15);
}

.range-slider::-moz-range-thumb {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--brand-primary);
  border: 3px solid white;
  box-shadow: var(--shadow-md);
  cursor: pointer;
}

/* 心率滑块特殊配色 */
.range-heart {
  background: linear-gradient(to right, #ef4444, #f59e0b, #22c55e);
}

/* 强度滑块特殊配色 */
.range-intensity {
  background: linear-gradient(to right, #86efac, #fde047, #fb923c, #f87171);
}

/* ========== 按钮 ========== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-full);
  font-weight: 700;
  font-size: 0.875rem;
  font-family: inherit;
  border: none;
  cursor: pointer;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.btn:active { transform: scale(0.97); }

.btn-primary {
  background: var(--brand-primary);
  color: white;
  box-shadow: 0 4px 14px rgba(124,58,237,0.35);
}

.btn-primary:hover {
  background: var(--brand-primary-dark);
  box-shadow: 0 6px 20px rgba(124,58,237,0.45);
  transform: translateY(-1px);
}

.btn-secondary {
  background: white;
  color: var(--brand-primary);
  border: 2px solid var(--brand-primary);
}

.btn-secondary:hover {
  background: var(--color-bg);
  transform: translateY(-1px);
}

.btn-sm { padding: 0.5rem 1rem; font-size: 0.8rem; }
.btn-lg { padding: 1rem 2rem; font-size: 1rem; }

/* ========== 标签/芯片组件 ========== */
.chip {
  display: inline-flex;
  align-items: center;
  padding: 0.375rem 0.875rem;
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  border: 2px solid transparent;
  user-select: none;
}

.chip-default {
  background: white;
  color: var(--color-text-muted);
  border-color: var(--color-border);
}

.chip-default:hover {
  border-color: var(--brand-primary-light);
  background: #f5f3ff;
}

.chip-selected {
  background: var(--brand-primary);
  color: white;
  border-color: var(--brand-primary);
  box-shadow: 0 2px 8px rgba(124,58,237,0.3);
}

/* 主题选择芯片 */
.topic-chip {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 0.5rem;
  text-align: center;
  min-width: 90px;
}

.topic-chip span:first-child { font-size: 1.5rem; margin-bottom: 0.25rem; }

/* 情绪词按钮 */
.emotion-btn {
  padding: 0.5rem 1rem;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 600;
  background: white;
  color: var(--color-text-muted);
  border: 2px solid var(--color-border);
  cursor: pointer;
  transition: all var(--transition-fast);
  user-select: none;
}

.emotion-btn:hover {
  border-color: #f9a8d4;
  background: #fdf2f8;
  color: #be185d;
}

.emotion-btn.selected {
  background: #ec4899;
  color: white;
  border-color: #ec4899;
  box-shadow: 0 2px 10px rgba(236,72,153,0.3);
}

/* 需求标签 */
.need-chip {
  display: inline-block;
  padding: 0.375rem 0.875rem;
  border-radius: var(--radius-full);
  font-size: 0.78rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  border: 2px solid transparent;
}

.need-chip-pink {
  background: #fce7f3;
  color: #be185d;
  border-color: #fbcfe8;
}
.need-chip-pink:hover,
.need-chip-pink.selected { background: #ec4899; color: white; }

.need-chip-amber {
  background: #fef3c7;
  color: #b45309;
  border-color: #fde68a;
}
.need-chip-amber:hover,
.need-chip-amber.selected { background: #f59e0b; color: white; }

/* ========== 呼吸引导动画 ========== */
.breath-circle {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: var(--gradient-step1);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-glow);
  transition: transform 4s cubic-bezier(0.4, 0, 0.2, 1),
              background-color 4s ease;
}

.breath-ring {
  stroke-dasharray: 283;
  stroke-dashoffset: 283;
  transition: stroke-dashoffset 4s ease;
}

.breath-ring.animating {
  stroke-dashoffset: 0;
}

/* ========== 计时器显示 ========== */
.timer-display {
  font-family: 'SF Mono', 'Fira Code', monospace;
  font-size: 2.5rem;
  font-weight: 800;
  letter-spacing: 0.05em;
  color: var(--brand-primary);
}

/* ========== 可折叠面板 ========== */
.collapsible-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  padding: var(--space-md);
  border-radius: var(--radius-md);
  transition: background var(--transition-fast);
  user-select: none;
}

.collapsible-header:hover { background: var(--color-bg); }

.collapsible-icon {
  transition: transform var(--transition-base);
  display: inline-block;
}

.collapsible.open .collapsible-icon {
  transform: rotate(90deg);
}

.collapsible-body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s var(--ease-out);
}

.collapsible.open .collapsible-body {
  max-height: 500px;
}

/* ========== 结果面板 ========== */
.result-panel {
  animation: resultSlideUp 0.5s var(--ease-out) forwards;
}

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

.script-box {
  background: linear-gradient(135deg, #f5f3ff 0%, #ede9fe 100%);
  border-left: 4px solid var(--brand-primary);
  border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
  padding: var(--space-lg);
  font-style: italic;
  font-size: 1rem;
  line-height: 1.8;
  color: #44403c;
}

/* ========== Toast 提示 ========== */
.toast {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--brand-primary-dark);
  color: white;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  font-weight: 600;
  box-shadow: var(--shadow-xl);
  z-index: 9999;
  opacity: 0;
  transition: all 0.4s var(--ease-out);
  pointer-events: none;
  white-space: nowrap;
  max-width: 90vw;
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ========== 滚动动画 ========== */
.fade-up {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s var(--ease-out), transform 0.6s var(--ease-out);
}

.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}

/* 延迟动画类 */
.delay-1 { transition-delay: 0.1s; }
.delay-2 { transition-delay: 0.2s; }
.delay-3 { transition-delay: 0.3s; }
.delay-4 { transition-delay: 0.4s; }
.delay-5 { transition-delay: 0.5s; }

/* ========== 数据锚点卡片 ========== */
.stat-card {
  text-align: center;
  padding: var(--space-lg);
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, #7c3aed 0%, #6366f1 100%);
  color: #ffffff;
  box-shadow: 0 4px 15px rgba(124, 58, 237, 0.25);
  border: 1px solid rgba(255,255,255,0.2);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.stat-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 25px rgba(124, 58, 237, 0.35);
}

.stat-number {
  font-size: 2rem;
  font-weight: 900;
  line-height: 1;
  color: #ffffff; /* 确保数字可见 */
}

.stat-label {
  font-size: 0.8rem;
  color: #ffffff; /* 确保标签可见 */
  font-weight: 600;
}
  opacity: 0.85;
  margin-top: 0.25rem;
}

/* ========== FAQ 手风琴 ========== */
.faq-item {
  border-bottom: 1px solid var(--color-border);
  transition: background var(--transition-fast);
}

.faq-item:last-child { border-bottom: none; }

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 0;
  cursor: pointer;
  font-weight: 700;
  font-size: 0.95rem;
  user-select: none;
  transition: color var(--transition-fast);
}

.faq-question:hover { color: var(--brand-primary); }

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s var(--ease-out), padding 0.3s var(--ease-out);
  padding-bottom: 0;
}

.faq-item.open .faq-answer {
  max-height: 500px;
  padding-bottom: 1.25rem;
}

.faq-arrow {
  transition: transform var(--transition-base);
  flex-shrink: 0;
  margin-left: 1rem;
}

.faq-item.open .faq-arrow { transform: rotate(180deg); }

/* ========== 页脚 ========== */
.footer-link {
  color: var(--color-text-light);
  transition: color var(--transition-fast);
  font-size: 0.85rem;
}

.footer-link:hover { color: white; }

/* ========== 返回顶部按钮 ========== */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--brand-primary);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: all var(--transition-base);
  z-index: 900;
  border: none;
  font-size: 1.2rem;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--brand-primary-dark);
  transform: translateY(-2px);
}

/* ========== 响应式断点适配 ========== */

/* 平板竖屏及以下 */
@media (max-width: 768px) {
  .hero-section { min-height: auto; padding: 6rem 0 4rem; }

  .stat-number { font-size: 1.5rem; }

  .timer-display { font-size: 2rem; }

  .breath-circle { width: 64px; height: 64px; }

  /* 减小内边距 */
  .card-body { padding: 1.25rem; }
  .card-header { padding: 1rem 1.25rem; }

  /* 主题选择器改为2列 */
  .topic-grid { grid-template-columns: repeat(2, 1fr) !important; }
}

/* 手机小屏 */
@media (max-width: 480px) {
  .stat-number { font-size: 1.25rem; }
  .btn-lg { padding: 0.875rem 1.5rem; font-size: 0.95rem; }

  .topic-chip {
    min-width: auto;
    padding: 0.5rem 0.375rem;
    font-size: 0.72rem;
  }

  .emotion-btn {
    padding: 0.375rem 0.75rem;
    font-size: 0.78rem;
  }

  .script-box {
    font-size: 0.9rem;
    padding: 1rem;
  }
}

/* 大屏优化 */
@media (min-width: 1280px) {
  .hero-section { min-height: 90vh; }
}

/* ========== 打印样式 ========== */
@media print {
  nav, .back-to-top, .toast, footer, button, .btn { display: none !important; }
  body { background: white !important; color: black !important; }
  .card { box-shadow: none !important; border: 1px solid #ddd !important; break-inside: avoid; }
  .step-container { page-break-inside: avoid; }
}

/* ========== 无障碍增强 ========== */
:focus-visible {
  outline: 2px solid var(--brand-primary);
  outline-offset: 2px;
}

/* 减少动画偏好 */
@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; }
}

/* ========== 暗色模式预留（未来扩展）========== */
/*
@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #111827;
    --color-text: #f3f4f6;
    --color-card: #1f2937;
    --color-border: #374151;
  }
}
*/

/* ========== 键盘导航增强 ========== */
.keyboard-nav *:focus {
  outline: 2px solid var(--brand-primary) !important;
  outline-offset: 2px !important;
  box-shadow: 0 0 0 4px rgba(124, 58, 237, 0.1) !important;
}

/* 默认隐藏键盘焦点，只在键盘导航时显示 */
*:focus:not(:focus-visible) {
  outline: none !important;
}

*:focus-visible {
  outline: 2px solid var(--brand-primary) !important;
  outline-offset: 2px !important;
}

/* ========== 移动端触摸优化 ========== */
@media (hover: none) and (pointer: coarse) {
  /* 增大触摸目标区域 */
  .btn, .emotion-btn, .topic-chip, .need-chip {
    min-height: 44px !important; /* Apple HIG推荐的最小触摸目标尺寸 */
    min-width: 44px !important;
  }

  /* 移除hover效果（移动设备不需要） */
  .card:hover { transform: none !important; }
  .stat-card:hover { transform: none !important; }

  /* 优化间距 */
  .step-container { padding: 0.5rem !important; }
  .card-body { padding: 1rem !important; }
}

/* ========== 超小屏设备适配（< 375px）========== */
@media (max-width: 374px) {
  body { font-size: 14px !important; }

  h1 { font-size: 1.5rem !important; }
  h2 { font-size: 1.25rem !important; }
  h3 { font-size: 1.125rem !important; }

  /* 紧凑布局 */
  .hero-section { padding: 4rem 0 2rem !important; min-height: auto !important; }

  .stat-card { padding: 0.75rem !important; }
  .grid-cols-3 { grid-template-columns: 1fr !important; gap: 0.75rem !important; }

  /* 按钮全宽 */
  .btn { width: 100% !important; margin-bottom: 0.5rem !important; }

  /* 表单优化 */
  .form-input { padding: 0.75rem !important; font-size: 16px !important; /* 防止iOS自动缩放 */ }

  /* 情绪按钮网格调整 */
  .emotion-btn { font-size: 11px !important; padding: 0.5rem 0.75rem !important; }
}

/* ========== 平板横屏优化（768px - 1024px）========== */
@media (min-width: 768px) and (max-width: 1024px) {
  .max-w-4xl { max-width: 90% !important; }
  .max-w-3xl { max-width: 95% !important; }

  /* 优化卡片间距 */
  .space-y-4 > * + * { margin-top: 1rem !important; }
  .space-y-5 > * + * { margin-top: 1.25rem !important; }
  .space-y-6 > * + * { margin-top: 1.5rem !important; }
}

/* ========== 高分辨率屏幕优化 ========== */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
  /* 使用更精细的边框和阴影 */
  .card { border-width: 0.5px !important; }
  .nav-fixed { border-width: 0.5px !important; }
}

/* ========== 横屏模式优化 ========== */
@media (orientation: landscape) and (max-height: 500px) {
  .hero-section { min-height: auto !important; padding: 3rem 0 1rem !important; }
  .py-16 { padding-top: 2rem !important; padding-bottom: 2rem !important; }
  .py-20 { padding-top: 2.5rem !important; padding-bottom: 2.5rem !important; }

  /* 减少垂直空间占用 */
  .breath-circle { width: 60px !important; height: 60px !important; }
  .timer-display { font-size: 1.5rem !important; }
}

/* ========== 性能优化：will-change提示 ========== */
.step-container,
.card,
.breath-circle,
.toast {
  will-change: transform, opacity;
}

/* ========== 加载状态动画 ========== */
@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

.loading-shimmer {
  background: linear-gradient(
    90deg,
    rgba(124, 58, 237, 0.05) 25%,
    rgba(124, 58, 237, 0.1) 50%,
    rgba(124, 58, 237, 0.05) 75%
  );
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
}

/* ========== 错误状态视觉反馈 ========== */
.input-error {
  border-color: var(--color-danger) !important;
  background-color: var(--color-danger-bg) !important;
  animation: shake 0.3s ease-in-out;
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-5px); }
  75% { transform: translateX(5px); }
}

/* ========== 成功状态视觉反馈 ========== */
.input-success {
  border-color: var(--color-success) !important;
  background-color: var(--color-success-bg) !important;
}

/* ========== 禁用状态优化 ========== */
.btn:disabled,
.emotion-btn:disabled {
  opacity: 0.5 !important;
  cursor: not-allowed !important;
  pointer-events: none !important;
}

/* ========== 屏幕阅读器专用内容 ========== */
.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;
}

/* ========== 可见性防御性规则（防止颜色对比度问题）========== */

/* Hero区域：确保渐变背景和白色文字可见 */
.hero-section {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
  background-color: #667eea; /* 备用纯色 */
}

/* stat-card：确保品牌色背景和白色文字 */
.stat-card {
  background: linear-gradient(135deg, #7c3aed 0%, #6366f1 100%) !important;
  color: #ffffff !important;
}

.stat-card .stat-number,
.stat-card .stat-label,
.stat-card p {
  color: #ffffff !important;
}

/* 按钮可见性保障 */
.btn-primary {
  background: linear-gradient(135deg, #7c3aed, #6366f1);
  background-color: #7c3aed;
  color: #ffffff;
  border: none;
}

.btn-secondary {
  background-color: transparent;
  color: #7c3aed;
  border: 2px solid #7c3aed;
}

/* 表单输入框 */
.form-input {
  background-color: #ffffff;
  color: #1f2937;
  border: 2px solid #e5e7eb;
}

.form-input:focus {
  border-color: #7c3aed;
  outline: none;
  box-shadow: 0 0 0 3px rgba(124, 58, 237, 0.1);
}

/* ========== 全局强制可见性修复（Tailwind CDN失败时的备用方案）========== */

/* 确保body基础样式 */
body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif !important;
  line-height: 1.6 !important;
  color: #1f2937 !important;
  background-color: #fafafa !important;
}

/* 导航栏强制可见 */
.nav-fixed {
  position: fixed !important;
  top: 0 !important;
  left: 0 !important;
  right: 0 !important;
  z-index: 1000 !important;
  background: rgba(255,255,255,0.95) !important;
  backdrop-filter: blur(12px) !important;
  border-bottom: 1px solid #e5e7eb !important;
  height: 56px !important;
  display: flex !important;
  align-items: center !important;
}

/* 导航链接 */
a {
  text-decoration: none !important;
  transition: color 0.2s ease !important;
}

.nav-link {
  display: inline-block !important;
  padding: 8px 0 !important;
  font-weight: 600 !important;
  font-size: 14px !important;
  color: #6b7280 !important;
  position: relative !important;
}

.nav-link:hover,
.nav-link.active {
  color: #7c3aed !important;
}

/* 所有section强制显示 */
section {
  display: block !important;
  padding: 64px 0 !important;
  min-height: auto !important;
}

/* 标题系统 */
h1, h2, h3, h4, h5, h6 {
  font-weight: 800 !important;
  letter-spacing: -0.02em !important;
  line-height: 1.25 !important;
  color: #111827 !important;
}

h1 { font-size: clamp(2rem, 5vw, 3rem) !important; }
h2 { font-size: clamp(1.5rem, 3vw, 2rem) !important; }
h3 { font-size: 1.25rem !important; }

/* 段落文本 */
p {
  line-height: 1.7 !important;
  color: #374151 !important;
  margin-bottom: 16px !important;
}

/* 卡片组件 */
.card {
  background-color: #ffffff !important;
  border-radius: 1rem !important;
  box-shadow: 0 4px 15px rgba(124,58,237,0.08) !important;
  border: 1px solid #e5e7eb !important;
  overflow: hidden !important;
  margin-bottom: 24px !important;
}

.card-header {
  padding: 24px 32px !important;
  color: #ffffff !important;
  font-weight: 700 !important;
  background: linear-gradient(135deg, #6366f1 0%, #7c3aed 100%) !important;
  background-color: #7c3aed !important;
}

.card-body {
  padding: 32px !important;
  background-color: #ffffff !important;
}

/* FAQ组件 */
.faq-item {
  border-radius: 0.75rem !important;
  overflow: hidden !important;
  margin-bottom: 16px !important;
  border: 1px solid #e5e7eb !important;
  background-color: #ffffff !important;
}

.faq-question {
  padding: 20px !important;
  cursor: pointer !important;
  display: flex !important;
  justify-content: space-between !important;
  align-items: center !important;
  background-color: #f9fafb !important;
  font-weight: 600 !important;
  color: #111827 !important;
  font-size: 1rem !important;
}

.faq-answer {
  padding: 20px !important;
  background-color: #ffffff !important;
  border-top: 1px solid #e5e7eb !important;
  font-size: 0.875rem !important;
  color: #4b5563 !important;
  line-height: 1.6 !important;
}

.faq-item.open .faq-answer {
  display: block !important;
}

/* Footer */
footer {
  background-color: #111827 !important;
  color: #9ca3af !important;
  padding: 48px 0 !important;
}

footer a {
  color: #9ca3af !important;
  font-size: 0.875rem !important;
}

footer a:hover {
  color: #ffffff !important;
}

footer p {
  color: #9ca3af !important;
  margin-bottom: 8px !important;
}

/* Grid布局辅助 */
.grid-cols-3 {
  grid-template-columns: repeat(3, 1fr) !important;
}

.grid-cols-4 {
  grid-template-columns: repeat(4, 1fr) !important;
}

@media (max-width: 767px) {
  .grid-cols-3,
  .grid-cols-4 {
    grid-template-columns: 1fr !important;
  }
}

/* 响应式间距 */
@media (max-width: 639px) {
  section {
    padding: 48px 0 !important;
  }

  .card-header {
    padding: 20px 24px !important;
  }

  .card-body {
    padding: 24px !important;
  }
}

/* 渐变背景section强制可见（处理所有使用Tailwind渐变class的区域） */
[class*="bg-gradient"] {
  position: relative !important;
}

/* 确保text-white在渐变背景上可见 */
.bg-gradient-to-br,
.bg-gradient-to-r,
.bg-gradient-to-l,
.bg-gradient-to-t,
.bg-gradient-to-b,
.from-indigo-500,
.via-purple-600,
.to-pink-500,
.from-blue-600,
.to-blue-700,
.from-emerald-600,
.to-teal-600,
.from-rose-500,
.to-pink-600,
.from-amber-500,
.to-orange-600 {
  color: #ffffff !important;
}

/* 子页面框架卡片头部颜色修复 */
.from-blue-600 { background: linear-gradient(to right, #2563eb, #1d4ed8) !important; background-color: #2563eb !important; }
.from-emerald-600 { background: linear-gradient(to right, #059669, #0d9488) !important; background-color: #059669 !important; }
.from-rose-500 { background: linear-gradient(to right, #f43f5e, #ec4899) !important; background-color: #f43f5e !important; }
.from-rose-500 { background: linear-gradient(to right, #f43f5e, #ec4899) !important; background-color: #f43f5e !important; }
.from-amber-500 { background: linear-gradient(to right, #f59e0b, #ea580c) !important; background-color: #f59e0b !important; }

/* 信息卡片背景色 */
.bg-blue-50 { background-color: #eff6ff !important; }
.bg-green-50 { background-color: #f0fdf4 !important; }
.bg-amber-50 { background-color: #fffbeb !important; }
.bg-purple-50 { background-color: #faf5ff !important; }

/* 边框色 */
.border-blue-100 { border-color: #dbeafe !important; }
.border-green-100 { border-color: #dcfce7 !important; }
.border-amber-100 { border-color: #fef3c7 !important; }
.border-purple-100 { border-color: #f3e8ff !important; }

/* 文本颜色 */
.text-gray-700 { color: #374151 !important; }
.text-gray-600 { color: #4b5563 !important; }
.text-blue-800 { color: #1e40af !important; }
.text-green-800 { color: #166534 !important; }
.text-amber-800 { color: #92400e !important; }
.text-purple-800 { color: #6b21a8 !important; }
.text-brand { color: #7c3aed !important; }
.text-white { color: #ffffff !important; }


/* ============================================
   🌙 暗色模式系统 (Dark Mode)
   ============================================ */

/* 暗色模式CSS变量覆盖 */
[data-theme="dark"] {
  /* 品牌色 - 保持不变 */
  --brand-primary: #a78bfa;
  --brand-primary-light: #c4b5fd;
  --brand-primary-dark: #8b5cf6;

  /* 中性色 - 深色主题 */
  --color-text: #f3f4f6;
  --color-text-muted: #d1d5db;
  --color-text-light: #9ca3af;
  --color-bg: #111827;
  --color-bg-alt: #1f2937;
  --color-border: #374151;
  --color-border-light: #2d3748;

  /* 功能色背景调整（降低亮度） */
  --color-success-bg: rgba(16,185,129,0.15);
  --color-warning-bg: rgba(245,158,11,0.15);
  --color-danger-bg: rgba(239,68,68,0.15);
  --color-info-bg: rgba(59,130,246,0.15);

  /* 渐变色调整 */
  --gradient-card: linear-gradient(135deg, #1f2937 0%, #111827 100%);
}

[data-theme="dark"] body {
  background-color: var(--color-bg) !important;
  color: var(--color-text) !important;
}

/* 全局元素暗色模式 */
[data-theme="dark"] {
  /* 背景色 */
  .bg-white,
  [class*="bg-white"],
  [style*="background-color: #ffffff"],
  [style*="background-color:#ffffff"],
  [style*="background: #ffffff"],
  [style*="background:#ffffff"] {
    background-color: var(--color-bg-alt) !important;
    background: var(--color-bg-alt) !important;
  }

  /* 浅灰背景 */
  [class*="bg-gray-50"],
  [class*="bg-gray-100"],
  [style*="background-color: #f9fafb"],
  [style*="background-color:#f9fafb"],
  [style*="background-color: #f3f4f6"],
  [style*="background-color:#f3f4f6"],
  [style*="background-color: #fafafa"],
  [style*="background-color:#fafafa"] {
    background-color: var(--color-bg) !important;
  }

  /* 文本颜色 */
  .text-gray-900,
  .text-gray-800,
  .text-gray-700,
  .text-gray-600,
  [style*="color: #1f2937"],
  [style*="color:#1f2937"],
  [style*="color: #111827"],
  [style*="color:#111827"],
  [style*="color: #374151"],
  [style*="color:#374151"],
  [style*="color: #4b5563"],
  [style*="color:#4b5563"] {
    color: var(--color-text) !important;
  }

  /* 边框颜色 */
  [class*="border-gray-200"],
  [class*="border-gray-300"],
  [class*="border-gray-100"],
  [style*="border-color: #e5e7eb"],
  [style*="border-color:#e5e7eb"],
  [style*="border: 1px solid #e5e7eb"],
  [style*="border:1px solid #e5e7eb"] {
    border-color: var(--color-border) !important;
  }

  /* 阴影调整 */
  [class*="shadow-lg"],
  [class*="shadow-md"],
  [class*="shadow-xl"] {
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.5) !important;
  }

  /* 卡片组件 */
  .card,
  [class*="rounded-2xl"][class*="shadow"],
  [class*="rounded-xl"][class*="border"] {
    background-color: var(--color-bg-alt) !important;
    border-color: var(--color-border) !important;
  }

  /* 导航栏 */
  nav[style*="background: rgba(255,255,255"],
  nav[style*="background:rgba(255,255,255"] {
    background: rgba(17,24,39,0.95) !important;
    border-bottom-color: var(--color-border) !important;
  }

  /* Footer */
  footer {
    background-color: #030712 !important;
  }

  /* 表单输入框 */
  input[type="text"],
  input[type="email"],
  input[type="number"],
  textarea,
  select,
  [class*="form-input"] {
    background-color: var(--color-bg) !important;
    color: var(--color-text) !important;
    border-color: var(--color-border) !important;
  }

  input[type="text"]:focus,
  input[type="email"]:focus,
  textarea:focus,
  select:focus {
    border-color: var(--brand-primary) !important;
    box-shadow: 0 0 0 3px rgba(124,58,237,0.2) !important;
  }

  /* 按钮 */
  .btn-secondary {
    background-color: transparent !important;
    color: var(--brand-primary-light) !important;
    border-color: var(--brand-primary-light) !important;
  }

  /* 信息卡片暗色适配 */
  .bg-blue-50,
  .bg-green-50,
  .bg-amber-50,
  .bg-purple-50,
  .bg-pink-50,
  .bg-indigo-50 {
    background-color: rgba(99,102,241,0.08) !important;
    border-color: rgba(99,102,241,0.2) !important;
  }

  .text-blue-800,
  .text-green-800,
  .text-amber-800,
  .text-purple-800,
  .text-pink-800 {
    color: var(--brand-primary-light) !important;
  }

  /* 特定区域暗色适配 */
  #hero,
  .hero-section {
    background: linear-gradient(135deg, #1e1b4b 0%, #312e81 50%, #4c1d95 100%) !important;
  }

  /* FAQ区域 */
  .faq-question {
    background-color: var(--color-bg) !important;
    color: var(--color-text) !important;
  }

  .faq-answer {
    background-color: var(--color-bg-alt) !important;
    color: var(--color-text-muted) !important;
    border-top-color: var(--color-border) !important;
  }

  /* 步骤进度点 */
  .step-dot {
    background-color: var(--color-border) !important;
  }

  .step-dot.active {
    background-color: var(--brand-primary) !important;
  }

  .step-dot.completed {
    background-color: var(--color-success) !important;
  }

  /* 呼吸法区域 */
  #breathingContainer > div:first-child,
  [id*="breathingContainer"] > div[class*="bg-indigo-50"] {
    background-color: rgba(99,102,241,0.1) !important;
    border-color: rgba(99,102,241,0.2) !important;
  }

  /* 计时器区域 */
  [class*="bg-amber-50"][class*="border-amber-200"] {
    background-color: rgba(245,158,11,0.1) !important;
    border-color: rgba(245,158,11,0.2) !important;
  }

  /* 情绪强度滑块容器 */
  [style*="background: linear-gradient(135deg, #fdf2f8"] {
    background: linear-gradient(135deg, rgba(236,72,153,0.1), rgba(236,72,153,0.05)) !important;
    border-color: rgba(236,72,153,0.2) !important;
  }

  /* Fair Fighting Rules头部 */
  [style*="background: linear-gradient(135deg, #f0fdf4"] {
    background: linear-gradient(135deg, rgba(16,185,129,0.1), rgba(16,185,129,0.05)) !important;
    border-color: rgba(16,185,129,0.2) !important;
  }

  /* 冲突类型分析结果 */
  [style*="background: linear-gradient(135deg, #f9fafb"] {
    background: linear-gradient(135deg, var(--color-bg-alt), var(--color-bg)) !important;
  }

  /* 结果面板 */
  .result-panel > div {
    background-color: var(--color-bg-alt) !important;
    border-color: var(--color-border) !important;
  }

  /* Toast通知 */
  .toast {
    background-color: var(--color-bg-alt) !important;
    color: var(--color-text) !important;
    border-color: var(--color-border) !important;
  }

  /* 折叠面板 */
  .collapsible-header {
    background-color: var(--color-bg) !important;
    color: var(--color-text) !important;
    border-bottom-color: var(--color-border) !important;
  }

  .collapsible-body {
    background-color: var(--color-bg-alt) !important;
    color: var(--color-text-muted) !important;
  }

  /* 表格 */
  table {
    background-color: var(--color-bg-alt) !important;
  }

  thead {
    background-color: var(--color-bg) !important;
  }

  tbody tr {
    border-bottom-color: var(--color-border) !important;
  }

  /* 链接悬停效果 */
  a:hover {
    color: var(--brand-primary-light) !important;
  }

  /* 占位符文本 */
  ::placeholder {
    color: var(--color-text-light) !important;
  }

  /* 选择文本 */
  ::selection {
    background-color: var(--brand-primary-dark);
    color: white;
  }

  /* 滚动条样式 */
  ::-webkit-scrollbar {
    width: 8px;
    height: 8px;
  }

  ::-webkit-scrollbar-track {
    background: var(--color-bg);
  }

  ::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: 4px;
  }

  ::-webkit-scrollbar-thumb:hover {
    background: var(--color-text-light);
  }
}

/* 暗色模式切换按钮动画 */
.theme-toggle {
  position: relative;
  width: 48px;
  height: 26px;
  background: linear-gradient(135deg, #e5e7eb, #d1d5db);
  border-radius: 13px;
  cursor: pointer;
  transition: all 0.3s ease;
  border: none;
  padding: 0;
}

.theme-toggle::before {
  content: '';
  position: absolute;
  top: 3px;
  left: 3px;
  width: 20px;
  height: 20px;
  background: white;
  border-radius: 50%;
  transition: all 0.3s ease;
  box-shadow: 0 2px 4px rgba(0,0,0,0.2);
}

.theme-toggle .theme-icon-sun,
.theme-toggle .theme-icon-moon {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  font-size: 14px;
  line-height: 1;
  transition: all 0.3s ease;
}

.theme-toggle .theme-icon-sun {
  left: 6px;
  opacity: 1;
}

.theme-toggle .theme-icon-moon {
  right: 6px;
  opacity: 0.3;
}

[data-theme="dark"] .theme-toggle {
  background: linear-gradient(135deg, #7c3aed, #6366f1);
}

[data-theme="dark"] .theme-toggle::before {
  transform: translateX(22px);
}

[data-theme="dark"] .theme-toggle .theme-icon-sun {
  opacity: 0.3;
}

[data-theme="dark"] .theme-toggle .theme-icon-moon {
  opacity: 1;
}

/* 平滑过渡动画 */
[data-theme="dark"],
[data-theme="dark"] *,
[data-theme="dark"] *::before,
[data-theme="dark"] *::after {
  transition: background-color 0.3s ease,
              color 0.3s ease,
              border-color 0.3s ease,
              box-shadow 0.3s ease;
}

/* 信息卡片背景色 */
.bg-blue-50 { background-color: #eff6ff !important; }
.bg-green-50 { background-color: #f0fdf4 !important; }
.bg-amber-50 { background-color: #fffbeb !important; }
.bg-purple-50 { background-color: #faf5ff !important; }

/* 边框色 */
.border-blue-100 { border-color: #dbeafe !important; }
.border-green-100 { border-color: #dcfce7 !important; }
.border-amber-100 { border-color: #fef3c7 !important; }
.border-purple-100 { border-color: #f3e8ff !important; }

/* 文本颜色 */
.text-gray-700 { color: #374151 !important; }
.text-gray-600 { color: #4b5563 !important; }
.text-blue-800 { color: #1e40af !important; }
.text-green-800 { color: #166534 !important; }
.text-amber-800 { color: #92400e !important; }
.text-purple-800 { color: #6b21a8 !important; }
.text-brand { color: #7c3aed !important; }
.text-white { color: #ffffff !important; }