/* ========================================
   国际标准智商测试 - 响应式布局
   ======================================== */

/* 移动端优先设计 - 基础样式适用于手机 */

/* 断点定义：
   - xs: < 576px (手机竖屏)
   - sm: ≥ 576px (手机横屏/小平板)
   - md: ≥ 768px (平板竖屏)
   - lg: ≥ 992px (平板横屏/小笔记本)
   - xl: ≥ 1200px (桌面)
   - xxl: ≥ 1400px (大屏)
*/

/* ============================================
   移动端核心修复 - 必须优先加载
   ============================================ */

/* 确保汉堡菜单按钮在移动端显示 */
@media (max-width: 991px) {
  .mobile-menu-toggle {
    display: flex !important;
    visibility: visible !important;
    opacity: 1 !important;
  }
  
  .nav-menu {
    display: none !important;
  }
  
  .nav-menu:not(.active) {
    display: none !important;
  }
}

/* 移动端仪表盘提示块 - 已在style.css中处理定位转换 */

/* ============================================
   移动端导航 (≤768px) - 侧边栏菜单
   ============================================ */
@media (max-width: 768px) {
  /* 头部容器 */
  .header > .container {
    position: relative;
  }
  
  /* 品牌区域 */
  .nav-brand {
    z-index: 1001;
  }
  
  /* 汉堡菜单按钮 - 固定在右侧，始终显示 */
  .mobile-menu-toggle {
    display: flex !important;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    position: absolute;
    right: var(--container-padding, 1rem);
    top: 50%;
    transform: translateY(-50%);
    width: 44px;
    height: 44px;
    background: var(--color-bg-dark);
    border: 1px solid var(--color-accent);
    border-radius: 8px;
    padding: 8px;
    cursor: pointer;
    z-index: 1001;
    opacity: 1 !important;
    visibility: visible !important;
  }
  
  .mobile-menu-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background-color: var(--color-accent);
    margin: 3px 0;
    transition: transform 0.3s, opacity 0.3s;
  }
  
  /* 汉堡按钮激活状态 */
  .mobile-menu-toggle.active span:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
  }
  
  .mobile-menu-toggle.active span:nth-child(2) {
    opacity: 0;
  }
  
  .mobile-menu-toggle.active span:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
  }
  
  /* 导航菜单 - 默认隐藏，固定在右侧 */
  .nav-menu {
    display: none !important;
    position: fixed;
    top: 0;
    right: 0;
    width: 280px;
    height: 100vh;
    flex-direction: column;
    background: var(--color-bg-dark, #0a0e1a);
    border-left: 1px solid var(--color-accent);
    padding: 80px var(--spacing-lg) var(--spacing-lg);
    z-index: 1000;
    box-shadow: -10px 0 30px rgba(0, 0, 0, 0.5);
  }
  
  /* 展开菜单 */
  .nav-menu.active {
    display: flex !important;
    animation: slideInFromRight 0.3s ease-out forwards;
  }
  
  @keyframes slideInFromRight {
    from {
      transform: translateX(100%);
      opacity: 0;
    }
    to {
      transform: translateX(0);
      opacity: 1;
    }
  }
  
  /* 遮罩层 */
  .nav-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.6);
    z-index: 999;
    animation: fadeIn 0.3s ease-out;
  }
  
  .nav-overlay.active {
    display: block;
  }
  
  @keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
  }
  
  .nav-menu li {
    width: 100%;
    border-bottom: 1px solid rgba(255, 215, 0, 0.2);
  }
  
  .nav-menu li:last-child {
    border-bottom: none;
    margin-top: auto;
  }
  
  .nav-menu li a {
    display: block;
    padding: var(--spacing-md) var(--spacing-sm);
    width: 100%;
    color: var(--color-text-light);
    text-align: left;
    font-size: var(--font-size-lg);
    text-decoration: none;
    transition: all 0.3s;
  }
  
  .nav-menu li a:hover {
    color: var(--color-accent);
    background-color: rgba(255, 215, 0, 0.1);
  }
  
  .nav-menu li a.btn-primary {
    margin-top: var(--spacing-md);
    text-align: center;
    border-radius: var(--border-radius-md);
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
    border: 2px solid var(--color-accent);
    color: var(--color-accent);
  }
}

/* 移动端Hero区域 */
.hero {
  padding: var(--spacing-2xl) 0;
  text-align: center;
}

.hero h1 {
  font-size: var(--font-size-3xl);
}

.hero p {
  font-size: var(--font-size-base);
}

/* 移动端卡片布局 */
.card-grid {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

/* 移动端内容区 */
.content-section {
  padding: var(--spacing-2xl) 0;
}

/* 移动端CTA按钮 */
.cta-buttons {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  align-items: stretch;
}

.cta-buttons .btn {
  width: 100%;
}

/* 移动端统计数据 */
.stats-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-md);
  text-align: center;
}

.stat-item {
  padding: var(--spacing-md);
}

.stat-number {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: var(--color-primary);
}

.stat-label {
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
  margin-top: var(--spacing-xs);
}

/* 移动端页脚 */
.footer-links {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-sm);
  text-align: center;
}

/* 平板设备 (≥ 768px) */
@media (min-width: 768px) {
  /* 导航菜单 */
  .mobile-menu-toggle {
    display: none;
  }
  
  .nav-menu {
    display: flex;
    flex-direction: row;
    width: auto;
  }
  
  .nav-menu li {
    width: auto;
    border-bottom: none;
    margin-left: var(--spacing-md);
  }
  
  .nav-menu li a {
    padding: var(--spacing-sm) var(--spacing-md);
  }
  
  /* Hero区域 */
  .hero {
    padding: var(--spacing-3xl) 0;
  }
  
  .hero h1 {
    font-size: var(--font-size-4xl);
  }
  
  .hero p {
    font-size: var(--font-size-lg);
  }
  
  /* 卡片布局 */
  .card-grid {
    flex-direction: row;
    flex-wrap: wrap;
  }
  
  .card-grid .card {
    flex: 1 1 calc(50% - var(--spacing-md));
  }
  
  /* CTA按钮 */
  .cta-buttons {
    flex-direction: row;
    justify-content: center;
  }
  
  .cta-buttons .btn {
    width: auto;
  }
  
  /* 统计数据 */
  .stats-grid {
    grid-template-columns: repeat(4, 1fr);
  }
  
  .stat-number {
    font-size: var(--font-size-3xl);
  }
  
  /* 内容区 */
  .content-section {
    padding: var(--spacing-3xl) 0;
  }
  
  /* 页脚 */
  .footer-links {
    flex-direction: row;
    justify-content: center;
    gap: var(--spacing-lg);
  }
}

/* 桌面设备 (≥ 992px) */
@media (min-width: 992px) {
  /* Hero区域 */
  .hero {
    padding: 100px 0;
    min-height: 70vh;
    display: flex;
    align-items: center;
  }
  
  .hero h1 {
    font-size: var(--font-size-5xl);
  }
  
  .hero p {
    font-size: var(--font-size-xl);
    max-width: 600px;
  }
  
  /* 卡片布局 - 三列 */
  .card-grid.c-grid-3 .card {
    flex: 1 1 calc(33.333% - var(--spacing-md));
  }
  
  /* 双栏布局 */
  .two-column-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    align-items: center;
  }
  
  .two-column-layout.reverse {
    direction: rtl;
  }
  
  .two-column-layout.reverse > * {
    direction: ltr;
  }
  
  /* 内容区 */
  .content-section {
    padding: 80px 0;
  }
  
  /* 容器宽度调整 */
  :root {
    --container-padding: var(--spacing-xl);
  }
}

/* 大屏设备 (≥ 1200px) */
@media (min-width: 1200px) {
  /* 卡片布局 - 四列 */
  .card-grid.c-grid-4 .card {
    flex: 1 1 calc(25% - var(--spacing-md));
  }
  
  /* 容器最大宽度 */
  :root {
    --container-max-width: 1400px;
  }
}

/* 超大屏设备 (≥ 1400px) */
@media (min-width: 1400px) {
  /* Hero区域 */
  .hero h1 {
    font-size: 4rem;
  }
  
  .hero p {
    font-size: var(--font-size-2xl);
  }
  
  :root {
    --container-max-width: 1600px;
  }
}

/* 触控设备优化 */
@media (hover: none) and (pointer: coarse) {
  /* 增大触控目标尺寸 */
  .btn {
    min-height: 48px;
    min-width: 48px;
    padding: var(--spacing-md) var(--spacing-xl);
  }
  
  .nav-menu li a {
    padding: var(--spacing-md) var(--spacing-lg);
  }
  
  /* 禁用hover效果 */
  .card:hover {
    transform: none;
  }
  
  .btn:hover {
    transform: none;
  }
}

/* 高分辨率屏幕 */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
  /* 使用高清图标 */
  .icon {
    transform: translateZ(0);
  }
}

/* 横屏模式 */
@media (orientation: landscape) and (max-width: 991px) {
  /* 平板横屏优化 */
  .hero {
    min-height: 50vh;
  }
  
  .stats-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* 打印样式 */
@media print {
  /* 隐藏非打印内容 */
  .mobile-menu-toggle,
  .cta-buttons,
  .nav-menu {
    display: none !important;
  }
  
  /* 打印时显示链接URL */
  a[href]::after {
    content: " (" attr(href) ")";
    font-size: 0.8em;
    color: #666;
  }
  
  /* 避免分页 */
  .card {
    break-inside: avoid;
  }
}

/* 辅助功能增强 */
@media (prefers-contrast: high) {
  /* 增强对比度 */
  :root {
    --color-primary: #000080;
    --color-secondary: #000040;
    --color-text: #000000;
    --color-text-light: #333333;
  }
  
  .btn {
    border-width: 3px;
  }
}

/* 暗色模式支持（可选） */
@media (prefers-color-scheme: dark) {
  :root {
    --color-background: #1a1a1a;
    --color-background-alt: #2d2d2d;
    --color-text: #e0e0e0;
    --color-text-light: #b0b0b0;
  }
  
  body {
    color: var(--color-text);
    background-color: var(--color-background);
  }
  
  .card {
    background-color: var(--color-background-alt);
  }
}

/* 可视区域动画触发类 */
.fade-in-on-scroll {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.fade-in-on-scroll.visible {
  opacity: 1;
  transform: translateY(0);
}

.scale-on-scroll {
  opacity: 0;
  transform: scale(0.9);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.scale-on-scroll.visible {
  opacity: 1;
  transform: scale(1);
}

/* 响应式图片 */
.responsive-image {
  width: 100%;
  height: auto;
  object-fit: cover;
}

.aspect-ratio-16-9 {
  aspect-ratio: 16 / 9;
}

.aspect-ratio-4-3 {
  aspect-ratio: 4 / 3;
}

.aspect-ratio-1-1 {
  aspect-ratio: 1 / 1;
}

/* 移动端三栏卡片布局 */
@media (max-width: 1024px) {
  .feature-cards-row {
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
    padding: var(--spacing-xl) var(--spacing-md);
  }
  
  .feature-card,
  .report-preview {
    min-height: auto;
    padding: var(--spacing-xl);
  }
  
  .feature-card .card-content,
  .report-preview .report-sample {
    padding: var(--spacing-md) 0;
  }
  
  /* 统计数据网格移动端 */
  .stat-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .stat-item {
    padding: var(--spacing-lg);
  }
  
  .stat-value {
    font-size: 24px;
  }
}

@media (max-width: 768px) {
  .feature-cards-row {
    padding: var(--spacing-lg) var(--spacing-md);
  }
  
  .card-header,
  .report-preview-header {
    padding-bottom: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
  }
  
  .card-header h4,
  .report-preview h4 {
    font-size: var(--font-size-lg);
  }
  
  .feature-list li {
    padding: var(--spacing-sm) var(--spacing-md);
  }
  
  .feature-badge {
    font-size: 10px;
    padding: 3px 8px;
  }
  
  .feature-text {
    font-size: 12px;
  }
}

/* ============================================
   移动端全面适配 - 核心布局修复
   ============================================ */

/* 移动端基础修复 (< 576px) */
@media (max-width: 575px) {
  /* 容器内边距 */
  .container {
    padding: 0 0.75rem;
  }
  
  /* Hero区域 */
  .hero .container {
    flex-direction: column;
    padding-top: 60px;
  }
  
  .hero-content {
    text-align: center;
    width: 100%;
  }
  
  .hero-badge {
    font-size: 0.75rem;
    padding: 0.25rem 0.75rem;
  }
  
  .hero h1,
  .hero-title {
    font-size: 1.75rem !important;
    line-height: 1.3;
  }
  
  .hero h1 .highlight,
  .hero-title .highlight {
    display: block;
    font-size: 1.25rem;
  }
  
  .hero-subtitle {
    font-size: 0.9rem !important;
    margin-bottom: 1rem;
  }
  
  /* Hero统计 */
  .hero-stats {
    flex-direction: row;
    justify-content: center;
    gap: 0.5rem;
    margin-bottom: 1rem;
  }
  
  .hero-stats .stat-item {
    padding: 0.5rem;
  }
  
  .hero-stats .stat-number {
    font-size: 1.25rem;
  }
  
  .hero-stats .stat-label {
    font-size: 0.65rem;
  }
  
  /* Hero CTA按钮 */
  .hero-cta {
    margin-bottom: 1rem;
  }
  
  .btn-large,
  .btn.btn-large {
    padding: 0.75rem 1.5rem;
    font-size: 0.9rem;
  }
  
  /* Hero视觉区域 */
  .hero-visual {
    width: 100%;
    max-width: 280px;
    margin: 0 auto;
  }
  
  /* 信任徽章 */
  .trust-badges {
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.5rem;
  }
  
  .trust-badge {
    font-size: 0.7rem;
    padding: 0.25rem 0.5rem;
  }
  
  .trust-badge img {
    width: 20px;
    height: 20px;
  }
}

/* 平板竖屏 (576px - 767px) */
@media (min-width: 576px) and (max-width: 767px) {
  .hero h1,
  .hero-title {
    font-size: 2rem;
  }
  
  .hero-title .highlight {
    font-size: 1.5rem;
  }
  
  .hero-subtitle {
    font-size: 1rem;
  }
  
  .hero-visual {
    max-width: 300px;
  }
}

/* ============================================
   移动端科学原理区
   ============================================ */
@media (max-width: 767px) {
  /* 科学原理双栏变单栏 */
  .two-column-layout {
    grid-template-columns: 1fr !important;
    gap: 2rem;
  }
  
  .two-column-layout .content-text,
  .two-column-layout .content-visual {
    width: 100%;
  }
  
  .content-text h3 {
    font-size: 1.5rem;
  }
  
  .content-text p {
    font-size: 0.9rem;
  }
  
  /* 公式框 */
  .formula-box {
    padding: 1rem;
    margin: 1rem 0;
  }
  
  .formula {
    font-size: 1.25rem;
  }
  
  /* 正态分布图 */
  .normal-distribution-chart {
    padding: 1rem;
    overflow-x: auto;
  }
  
  .distribution-svg {
    min-width: 300px;
  }
  
  /* 科学指标网格 */
  .science-metrics {
    grid-template-columns: repeat(2, 1fr) !important;
    gap: 1rem;
  }
  
  .metric-card {
    padding: 1rem;
  }
  
  .metric-value {
    font-size: 1.5rem;
  }
  
  /* 科学原理功能列表 */
  .feature-list {
    font-size: 0.85rem;
  }
}

/* ============================================
   移动端流程区
   ============================================ */
@media (max-width: 767px) {
  .process-steps {
    flex-direction: column !important;
    align-items: center;
  }
  
  .step-connector {
    display: none;
  }
  
  .step {
    width: 100%;
    max-width: 320px;
    margin-bottom: 2rem;
  }
  
  .step-number {
    font-size: 48px;
    top: -20px;
  }
  
  .step-icon {
    width: 60px;
    height: 60px;
  }
  
  .step-icon img {
    width: 32px;
    height: 32px;
  }
  
  .step h3 {
    font-size: 1.25rem;
  }
  
  .step p {
    font-size: 0.85rem;
  }
}

/* ============================================
   移动端用户见证区
   ============================================ */
@media (max-width: 767px) {
  .testimonials-stats {
    grid-template-columns: repeat(2, 1fr) !important;
    gap: 0.75rem;
  }
  
  .stat-card {
    padding: 1rem 0.5rem;
  }
  
  .stat-icon {
    font-size: 24px;
  }
  
  .stat-card .stat-number {
    font-size: 1.25rem;
  }
  
  .stat-card .stat-label {
    font-size: 0.7rem;
  }
  
  .testimonials-grid {
    grid-template-columns: 1fr !important;
    gap: 1rem;
  }
  
  .testimonial-card {
    padding: 1rem;
  }
  
  .testimonial-header {
    flex-wrap: wrap;
  }
  
  .user-avatar {
    width: 36px;
    height: 36px;
    font-size: 0.75rem;
  }
  
  .user-name {
    font-size: 0.9rem;
  }
  
  .user-title {
    font-size: 0.7rem;
  }
  
  .testimonial-content p {
    font-size: 0.85rem;
  }
}

/* ============================================
   移动端特色功能区
   ============================================ */
@media (max-width: 767px) {
  .features-grid {
    grid-template-columns: 1fr !important;
    gap: 1.5rem;
  }
  
  .feature-card {
    padding: 1.5rem;
  }
  
  .feature-icon {
    font-size: 2rem;
  }
  
  .feature-card h3 {
    font-size: 1.25rem;
  }
  
  .feature-card p {
    font-size: 0.85rem;
  }
  
  /* ============================================
     三栏卡片移动端 - 强制独立列显示
     ============================================ */
  .feature-cards-row {
    display: flex !important;
    flex-direction: column !important;
    flex-wrap: nowrap !important;
    gap: 1.5rem !important;
    padding: 1rem 0 !important;
    width: 100% !important;
    max-width: 100% !important;
    box-sizing: border-box !important;
  }
  
  .feature-cards-row > * {
    display: flex !important;
    flex-direction: column !important;
    width: 100% !important;
    max-width: 100% !important;
    min-width: 100% !important;
    margin: 0 !important;
    padding: 1.25rem !important;
    box-sizing: border-box !important;
  }
  
  /* 科学测评体系卡片 - 第一列 */
  .feature-cards-row > .feature-card:nth-child(1),
  .feature-cards-row > div.feature-card:nth-child(1) {
    order: 1;
    flex-shrink: 0;
  }
  
  /* 报告示例卡片 - 第二列 */
  .feature-cards-row > .report-preview {
    order: 2;
    flex-shrink: 0;
  }
  
  /* 全球数据统计卡片 - 第三列 */
  .feature-cards-row > .feature-card:nth-child(3),
  .feature-cards-row > div.feature-card:nth-child(3) {
    order: 3;
    flex-shrink: 0;
  }
  
  /* 卡片头部优化 */
  .feature-cards-row .card-header {
    display: flex !important;
    align-items: center !important;
    gap: 0.75rem !important;
    margin-bottom: 1rem !important;
    padding-bottom: 0.75rem !important;
    border-bottom: 1px solid rgba(255, 215, 0, 0.2) !important;
  }
  
  .feature-cards-row .card-header h4 {
    font-size: 1.1rem !important;
    color: #ffd700 !important;
    margin: 0 !important;
  }
  
  .feature-cards-row .card-icon {
    font-size: 24px !important;
  }
  
  /* 报告示例头部 */
  .feature-cards-row .report-preview-header {
    display: flex !important;
    align-items: center !important;
    gap: 0.75rem !important;
    margin-bottom: 1rem !important;
    padding-bottom: 0.75rem !important;
    border-bottom: 1px solid rgba(255, 215, 0, 0.2) !important;
  }
  
  .feature-cards-row .report-preview-header h4 {
    font-size: 1.1rem !important;
    color: #ffd700 !important;
    margin: 0 !important;
  }
  
  .feature-cards-row .report-icon {
    font-size: 24px !important;
  }
  
  /* 特点列表优化 */
  .feature-cards-row .card-content {
    flex: 1 !important;
  }
  
  .feature-cards-row .feature-list {
    display: flex !important;
    flex-direction: column !important;
    gap: 0.5rem !important;
    list-style: none !important;
    padding: 0 !important;
    margin: 0 !important;
  }
  
  .feature-cards-row .feature-list li {
    display: flex !important;
    flex-direction: column !important;
    align-items: flex-start !important;
    gap: 0.25rem !important;
    padding: 0.5rem 0.75rem !important;
    background: rgba(255, 215, 0, 0.05) !important;
    border-radius: 6px !important;
    font-size: 0.9rem !important;
  }
  
  .feature-cards-row .feature-badge {
    font-size: 0.7rem !important;
    padding: 0.15rem 0.4rem !important;
    background: rgba(255, 215, 0, 0.2) !important;
    border-radius: 4px !important;
    color: #ffd700 !important;
  }
  
  .feature-cards-row .feature-text {
    font-size: 0.85rem !important;
    color: #e0e0e0 !important;
  }
  
  /* 报告示例内容 */
  .feature-cards-row .report-sample {
    padding: 0 !important;
    width: 100% !important;
  }
  
  .feature-cards-row .iq-score-display {
    display: flex !important;
    flex-direction: column !important;
    align-items: center !important;
    padding: 1rem !important;
    background: rgba(255, 215, 0, 0.1) !important;
    border-radius: 10px !important;
    margin-bottom: 1rem !important;
  }
  
  .feature-cards-row .score-label {
    font-size: 0.85rem !important;
    color: #9e9e9e !important;
  }
  
  .feature-cards-row .score-value {
    font-size: 2.5rem !important;
    font-weight: 700 !important;
    color: #ffd700 !important;
  }
  
  .feature-cards-row .score-percentile {
    font-size: 0.8rem !important;
    color: #9e9e9e !important;
  }
  
  /* 维度条形图 */
  .feature-cards-row .report-dimensions {
    display: flex !important;
    flex-direction: column !important;
    gap: 0.5rem !important;
  }
  
  .feature-cards-row .dimension-item {
    display: flex !important;
    align-items: center !important;
    gap: 0.5rem !important;
    padding: 0.25rem 0 !important;
  }
  
  .feature-cards-row .dimension-name {
    font-size: 0.85rem !important;
    color: #e0e0e0 !important;
    min-width: 70px !important;
  }
  
  .feature-cards-row .dimension-bar {
    flex: 1 !important;
    height: 8px !important;
    background: rgba(255, 255, 255, 0.1) !important;
    border-radius: 4px !important;
    overflow: hidden !important;
  }
  
  .feature-cards-row .dimension-fill {
    height: 100% !important;
    background: linear-gradient(90deg, #ffd700, #ff9800) !important;
    border-radius: 4px !important;
  }
  
  .feature-cards-row .dimension-score {
    font-size: 0.8rem !important;
    color: #ffd700 !important;
    min-width: 50px !important;
    text-align: right !important;
  }
  
  /* 统计数据网格 */
  .feature-cards-row .stat-grid {
    display: grid !important;
    grid-template-columns: repeat(2, 1fr) !important;
    gap: 0.75rem !important;
  }
  
  .feature-cards-row .stat-item {
    display: flex !important;
    flex-direction: column !important;
    align-items: center !important;
    padding: 0.75rem !important;
    background: rgba(255, 215, 0, 0.05) !important;
    border-radius: 8px !important;
    border: 1px solid rgba(255, 215, 0, 0.1) !important;
  }
  
  .feature-cards-row .stat-value {
    font-size: 1.25rem !important;
    font-weight: 700 !important;
    color: #ffd700 !important;
  }
  
  .feature-cards-row .stat-label {
    font-size: 0.7rem !important;
    color: #9e9e9e !important;
    margin-top: 0.25rem !important;
  }
  
  /* ============================================
     三栏卡片超小屏幕优化 (≤575px)
     ============================================ */
  .feature-cards-row {
    gap: 1rem !important;
    padding: 0.5rem 0 !important;
  }
  
  .feature-cards-row > * {
    padding: 1rem !important;
    border-radius: 10px !important;
  }
  
  /* 卡片头部 */
  .feature-cards-row .card-header h4,
  .feature-cards-row .report-preview-header h4 {
    font-size: 1rem !important;
  }
  
  .feature-cards-row .card-icon,
  .feature-cards-row .report-icon {
    font-size: 20px !important;
  }
  
  /* 特点列表 */
  .feature-cards-row .feature-list li {
    padding: 0.4rem 0.6rem !important;
    font-size: 0.85rem !important;
  }
  
  .feature-cards-row .feature-badge {
    font-size: 0.65rem !important;
  }
  
  .feature-cards-row .feature-text {
    font-size: 0.8rem !important;
  }
  
  /* 报告示例 */
  .feature-cards-row .iq-score-display {
    padding: 0.75rem !important;
  }
  
  .feature-cards-row .score-value {
    font-size: 2rem !important;
  }
  
  .feature-cards-row .score-label {
    font-size: 0.8rem !important;
  }
  
  .feature-cards-row .score-percentile {
    font-size: 0.75rem !important;
  }
  
  /* 维度条形图 */
  .feature-cards-row .dimension-item {
    padding: 0.2rem 0 !important;
  }
  
  .feature-cards-row .dimension-name {
    font-size: 0.75rem !important;
    min-width: 55px !important;
  }
  
  .feature-cards-row .dimension-score {
    font-size: 0.7rem !important;
    min-width: 45px !important;
  }
  
  .feature-cards-row .dimension-bar {
    height: 6px !important;
  }
  
  /* 统计网格 */
  .feature-cards-row .stat-grid {
    grid-template-columns: repeat(2, 1fr) !important;
    gap: 0.5rem !important;
  }
  
  .feature-cards-row .stat-item {
    padding: 0.5rem !important;
  }
  
  .feature-cards-row .stat-value {
    font-size: 1rem !important;
  }
  
  .feature-cards-row .stat-label {
    font-size: 0.65rem !important;
  }
}

/* ============================================
   移动端FAQ区
   ============================================ */
@media (max-width: 767px) {
  .faq-item {
    margin-bottom: 0.75rem;
  }
  
  .faq-question {
    padding: 1rem;
    font-size: 0.9rem;
  }
  
  .faq-answer {
    padding: 1rem;
    font-size: 0.85rem;
  }
  
  .faq-answer ul {
    padding-left: 1rem;
  }
  
  .faq-answer li {
    margin-bottom: 0.5rem;
  }
}

/* ============================================
   移动端CTA区
   ============================================ */
@media (max-width: 767px) {
  .cta-content {
    padding: 2rem 1rem;
  }
  
  .cta-content h2 {
    font-size: 1.5rem;
  }
  
  .cta-content > p {
    font-size: 0.9rem;
  }
  
  .cta-benefits {
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
  }
  
  .benefit {
    font-size: 0.8rem;
    padding: 0.25rem 0.75rem;
  }
  
  .cta-buttons {
    flex-direction: column;
    gap: 0.75rem;
  }
  
  .cta-buttons .btn {
    width: 100%;
  }
  
  .cta-note {
    font-size: 0.75rem;
  }
}

/* ============================================
   移动端页脚
   ============================================ */
@media (max-width: 767px) {
  .footer {
    padding: 2rem 0 1rem;
  }
  
  .footer-content {
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 1.5rem;
  }
  
  .footer-brand {
    width: 100%;
  }
  
  .footer-brand img {
    margin: 0 auto 0.5rem;
  }
  
  .footer-brand p {
    font-size: 0.9rem;
  }
  
  .footer-tagline {
    font-size: 0.75rem;
  }
  
  .footer-links {
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.5rem;
  }
  
  .footer-links a {
    font-size: 0.8rem;
    padding: 0.25rem 0.5rem;
  }
  
  .footer-contact {
    font-size: 0.8rem;
  }
  
  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }

  .footer-bottom-slogan {
    display: none;
  }

  .footer-bottom-qrcodes {
    justify-content: center;
    margin-bottom: var(--spacing-md);
  }

  .footer-bottom-info {
    text-align: center;
  }

  .footer-bottom-info p {
    font-size: 0.7rem;
  }
}

/* ============================================
   移动端通用字体和间距优化
   ============================================ */
@media (max-width: 767px) {
  /* 标题字体 */
  h1 { font-size: 2rem !important; }
  h2 { font-size: 1.75rem !important; }
  h3 { font-size: 1.5rem !important; }
  h4 { font-size: 1.25rem !important; }
  h5 { font-size: 1.1rem !important; }
  h6 { font-size: 1rem !important; }
  
  /* 段落字体 */
  p {
    font-size: 0.9rem;
    line-height: 1.6;
  }
  
  /* 章节间距 */
  .content-section {
    padding: 3rem 0;
  }
  
  .section-header {
    margin-bottom: 2rem;
  }
  
  .section-subtitle {
    font-size: 0.9rem;
  }
  
  /* 防止水平滚动 */
  * {
    max-width: 100%;
    overflow-wrap: break-word;
  }
  
  img {
    max-width: 100%;
    height: auto;
  }
  
  /* 隐藏溢出容器 */
  .hero-bg-shapes {
    display: none;
  }
  
  /* SVG响应式 */
  svg {
    max-width: 100%;
    height: auto;
  }
}

/* ============================================
   移动端安全边际
   ============================================ */
@media (max-width: 374px) {
  /* 超小屏幕优化 (iPhone SE 等) */
  .hero h1,
  .hero-title {
    font-size: 1.5rem !important;
  }
  
  .hero-title .highlight {
    font-size: 1rem;
  }
  
  .hero-badge {
    font-size: 0.65rem;
  }
  
  .hero-stats .stat-number {
    font-size: 1rem;
  }
  
  .btn-large,
  .btn.btn-large {
    padding: 0.6rem 1rem;
    font-size: 0.8rem;
  }
  
  .metric-card {
    padding: 0.75rem;
  }
  
  .metric-value {
    font-size: 1.25rem;
  }
}