/* ==========================================================================
   OxBot 现代化样式系统 v2.0
   Enhanced Design System with Modern UI/UX Principles
   ========================================================================== */

/* ==========================================================================
   设计系统 - Design Tokens
   ========================================================================== */

:root {
  /* 主色调系统 - Primary Colors */
  --color-primary-50: #eff6ff;
  --color-primary-100: #dbeafe;
  --color-primary-200: #bfdbfe;
  --color-primary-300: #93c5fd;
  --color-primary-400: #60a5fa;
  --color-primary-500: #3b82f6;
  --color-primary-600: #2563eb;
  --color-primary-700: #1d4ed8;
  --color-primary-800: #1e40af;
  --color-primary-900: #1e3a8a;
  --color-primary-950: #172554;

  /* 品牌色系统 - Brand Colors */
  --color-oxbot-50: #f0f9ff;
  --color-oxbot-100: #e0f2fe;
  --color-oxbot-200: #bae6fd;
  --color-oxbot-300: #7dd3fc;
  --color-oxbot-400: #38bdf8;
  --color-oxbot-500: #0ea5e9;
  --color-oxbot-600: #0284c7;
  --color-oxbot-700: #0369a1;
  --color-oxbot-800: #075985;
  --color-oxbot-900: #0c4a6e;
  --color-oxbot-950: #082f49;

  /* 辅助色系统 - Secondary Colors */
  --color-success-50: #f0fdf4;
  --color-success-500: #22c55e;
  --color-success-600: #16a34a;
  --color-success-700: #15803d;

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

  --color-error-50: #fef2f2;
  --color-error-500: #ef4444;
  --color-error-600: #dc2626;
  --color-error-700: #b91c1c;

  /* 中性色系统 - Neutral Colors */
  --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;

  /* 字体系统 - Typography */
  --font-family-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', '微软雅黑', sans-serif;
  --font-family-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;

  /* 字体大小 - Font Sizes */
  --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: 1.875rem;   /* 30px */
  --font-size-4xl: 2.25rem;    /* 36px */
  --font-size-5xl: 3rem;       /* 48px */
  --font-size-6xl: 3.75rem;    /* 60px */
  --font-size-7xl: 4.5rem;     /* 72px */

  /* 行高系统 - Line Heights */
  --line-height-tight: 1.25;
  --line-height-snug: 1.375;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.625;
  --line-height-loose: 2;

  /* 间距系统 - Spacing (基于4px) */
  --space-0: 0;
  --space-1: 0.25rem;    /* 4px */
  --space-2: 0.5rem;     /* 8px */
  --space-3: 0.75rem;    /* 12px */
  --space-4: 1rem;       /* 16px */
  --space-5: 1.25rem;    /* 20px */
  --space-6: 1.5rem;     /* 24px */
  --space-8: 2rem;       /* 32px */
  --space-10: 2.5rem;    /* 40px */
  --space-12: 3rem;      /* 48px */
  --space-16: 4rem;      /* 64px */
  --space-20: 5rem;      /* 80px */
  --space-24: 6rem;      /* 96px */
  --space-32: 8rem;      /* 128px */

  /* 圆角系统 - Border Radius */
  --radius-none: 0;
  --radius-sm: 0.125rem;   /* 2px */
  --radius-base: 0.25rem;  /* 4px */
  --radius-md: 0.375rem;   /* 6px */
  --radius-lg: 0.5rem;     /* 8px */
  --radius-xl: 0.75rem;    /* 12px */
  --radius-2xl: 1rem;      /* 16px */
  --radius-3xl: 1.5rem;    /* 24px */
  --radius-full: 9999px;

  /* 阴影系统 - Shadows */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-base: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  --shadow-2xl: 0 25px 50px -12px rgb(0 0 0 / 0.25);
  --shadow-inner: inset 0 2px 4px 0 rgb(0 0 0 / 0.05);

  /* 动画系统 - Animations */
  --transition-fast: 150ms ease-in-out;
  --transition-base: 250ms ease-in-out;
  --transition-slow: 350ms ease-in-out;

  /* Z-index系统 - Z-Index */
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal-backdrop: 1040;
  --z-modal: 1050;
  --z-popover: 1060;
  --z-tooltip: 1070;
  --z-toast: 1080;
}

/* ==========================================================================
   基础样式重置 - Base Styles
   ========================================================================== */

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
  font-size: 16px;
}

body {
  font-family: var(--font-family-primary);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  color: var(--color-gray-900);
  background-color: var(--color-gray-50);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

::-webkit-scrollbar-track {
  background: var(--color-gray-100);
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb {
  background: var(--color-gray-300);
  border-radius: var(--radius-full);
  transition: background-color var(--transition-base);
}

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

/* ==========================================================================
   排版系统 - Typography
   ========================================================================== */

h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: var(--line-height-tight);
  letter-spacing: -0.025em;
  color: var(--color-gray-900);
}

h1 {
  font-size: var(--font-size-5xl);
  margin-bottom: var(--space-6);
}

h2 {
  font-size: var(--font-size-4xl);
  margin-bottom: var(--space-5);
}

h3 {
  font-size: var(--font-size-3xl);
  margin-bottom: var(--space-4);
}

h4 {
  font-size: var(--font-size-2xl);
  margin-bottom: var(--space-3);
}

h5 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-3);
}

h6 {
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-2);
}

p {
  margin-bottom: var(--space-4);
  line-height: var(--line-height-relaxed);
  color: var(--color-gray-700);
}

a {
  color: var(--color-oxbot-600);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-oxbot-700);
}

/* ==========================================================================
   布局系统 - Layout
   ========================================================================== */

.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--space-4);
}

@media (min-width: 640px) {
  .container {
    padding: 0 var(--space-6);
  }
}

@media (min-width: 1024px) {
  .container {
    padding: 0 var(--space-8);
  }
}

/* ==========================================================================
   按钮组件系统 - Button Components
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-size: var(--font-size-base);
  font-weight: 600;
  line-height: 1;
  border: 2px solid transparent;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  transition: left 0.5s;
}

.btn:hover::before {
  left: 100%;
}

.btn:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgb(59 130 246 / 0.3);
}

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

/* 主要按钮 - Primary Button */
.btn-primary {
  background: linear-gradient(135deg, var(--color-oxbot-600), var(--color-oxbot-700));
  color: white;
  box-shadow: var(--shadow-md);
}

.btn-primary:hover:not(:disabled) {
  background: linear-gradient(135deg, var(--color-oxbot-700), var(--color-oxbot-800));
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn-primary:active {
  transform: translateY(0);
}

/* 次要按钮 - Secondary Button */
.btn-secondary {
  background: var(--color-gray-100);
  color: var(--color-gray-900);
  border-color: var(--color-gray-200);
}

.btn-secondary:hover:not(:disabled) {
  background: var(--color-gray-200);
  border-color: var(--color-gray-300);
  transform: translateY(-1px);
}

/* 轮廓按钮 - Outline Button */
.btn-outline {
  background: transparent;
  color: var(--color-oxbot-600);
  border-color: var(--color-oxbot-600);
}

.btn-outline:hover:not(:disabled) {
  background: var(--color-oxbot-600);
  color: white;
  transform: translateY(-1px);
}

/* 成功按钮 - Success Button */
.btn-success {
  background: linear-gradient(135deg, var(--color-success-500), var(--color-success-600));
  color: white;
  box-shadow: var(--shadow-md);
}

.btn-success:hover:not(:disabled) {
  background: linear-gradient(135deg, var(--color-success-600), var(--color-success-700));
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

/* 错误按钮 - Error Button */
.btn-error {
  background: linear-gradient(135deg, var(--color-error-500), var(--color-error-600));
  color: white;
  box-shadow: var(--shadow-md);
}

.btn-error:hover:not(:disabled) {
  background: linear-gradient(135deg, var(--color-error-600), var(--color-error-700));
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

/* 按钮大小变体 */
.btn-sm {
  padding: var(--space-2) var(--space-4);
  font-size: var(--font-size-sm);
}

.btn-lg {
  padding: var(--space-4) var(--space-8);
  font-size: var(--font-size-lg);
}

.btn-xl {
  padding: var(--space-5) var(--space-10);
  font-size: var(--font-size-xl);
}

/* ==========================================================================
   卡片组件系统 - Card Components
   ========================================================================== */

.card {
  background: white;
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-base);
  overflow: hidden;
  transition: all var(--transition-base);
  border: 1px solid var(--color-gray-100);
  padding: var(--space-8);
  margin-bottom: var(--space-6);
}

.card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.card-header {
  padding: var(--space-6) var(--space-8);
  border-bottom: 1px solid var(--color-gray-100);
  margin: calc(-1 * var(--space-8)) calc(-1 * var(--space-8)) var(--space-6) calc(-1 * var(--space-8));
}

.card-body {
  padding: 0;
}

.card-footer {
  padding: var(--space-6) var(--space-8);
  border-top: 1px solid var(--color-gray-100);
  background: var(--color-gray-50);
  margin: var(--space-6) calc(-1 * var(--space-8)) calc(-1 * var(--space-8)) calc(-1 * var(--space-8));
}

/* 特殊card变体 */
.card.bg-gradient {
  background: linear-gradient(135deg, var(--color-gray-50) 0%, white 100%);
  border: 1px solid var(--color-gray-200);
  position: relative;
  overflow: hidden;
}

.card.bg-gradient::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-oxbot-500), var(--color-primary-500));
}

.card.text-center {
  text-align: center;
}

/* 联系卡片特殊样式 */
.contact-card {
  background: linear-gradient(135deg, var(--color-oxbot-50) 0%, white 100%);
  border: 1px solid var(--color-oxbot-200);
}

.contact-card::before {
  background: linear-gradient(90deg, var(--color-oxbot-500), var(--color-oxbot-600));
}

/* Card内容间距优化 */
.card > *:not(:first-child) {
  margin-top: var(--space-6);
}

.card > *:last-child {
  margin-bottom: 0;
}

/* FAQ卡片特殊样式 */
.card .flex.items-start {
  gap: var(--space-6);
  align-items: flex-start;
}

.card .w-12.h-12 {
  flex-shrink: 0;
  margin-top: var(--space-1);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-base);
}

.card:hover .w-12.h-12 {
  transform: scale(1.05);
  box-shadow: var(--shadow-md);
}

/* FAQ编号圆圈渐变色彩 */
.faq-number-1 { background: linear-gradient(135deg, var(--color-oxbot-500), var(--color-oxbot-600)) !important; }
.faq-number-2 { background: linear-gradient(135deg, var(--color-success-500), var(--color-success-600)) !important; }
.faq-number-3 { background: linear-gradient(135deg, var(--color-error-500), var(--color-error-600)) !important; }
.faq-number-4 { background: linear-gradient(135deg, #8b5cf6, #7c3aed) !important; }
.faq-number-5 { background: linear-gradient(135deg, var(--color-warning-500), var(--color-warning-600)) !important; }
.faq-number-6 { background: linear-gradient(135deg, #6366f1, #4f46e5) !important; }
.faq-number-7 { background: linear-gradient(135deg, #ec4899, #db2777) !important; }

/* 下载页面卡片优化 */
.card .space-y-3 > * + * {
  margin-top: var(--space-3);
}

.card .space-y-6 > * + * {
  margin-top: var(--space-6);
}

/* 下载页面特殊图标样式 */
.download-icon {
  background: linear-gradient(135deg, var(--color-error-100), var(--color-error-50));
  transition: all var(--transition-base);
}

.download-icon.blue {
  background: linear-gradient(135deg, var(--color-primary-100), var(--color-primary-50));
}

.download-icon.green {
  background: linear-gradient(135deg, var(--color-success-100), var(--color-success-50));
}

.download-icon.red {
  background: linear-gradient(135deg, var(--color-error-100), var(--color-error-50));
}

.card:hover .download-icon {
  transform: scale(1.1);
  box-shadow: var(--shadow-lg);
}

/* 团队介绍卡片优化 - 只影响包含文本的flex容器，不影响图标容器 */
.card .space-y-6 .flex.items-center:not(.justify-center) {
  padding: var(--space-4);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.7);
  transition: all var(--transition-base);
}

.card .space-y-6 .flex.items-center:not(.justify-center):hover {
  background: rgba(255, 255, 255, 0.9);
  transform: translateY(-2px);
}

/* 时间线样式优化 */
.timeline-item {
  position: relative;
  padding-left: var(--space-20);
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: var(--space-6);
  top: var(--space-6);
  bottom: calc(-1 * var(--space-8));
  width: 2px;
  background: var(--color-gray-200);
}

.timeline-item:last-child::before {
  display: none;
}

.timeline-number {
  position: absolute;
  left: 0;
  top: 0;
  z-index: 1;
}

/* 产品卡片特殊样式 */
.product-card {
  position: relative;
  background: white;
  border-radius: var(--radius-2xl);
  overflow: hidden;
  box-shadow: var(--shadow-base);
  transition: all var(--transition-base);
  border: 1px solid var(--color-gray-100);
  display: flex;
  flex-direction: column;
  height: 100%;
}

.product-card:hover {
  box-shadow: var(--shadow-xl);
  transform: translateY(-6px);
}

.product-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--color-oxbot-500), var(--color-primary-500));
  opacity: 0;
  transition: opacity var(--transition-base);
  z-index: 1;
}

.product-card:hover::before {
  opacity: 1;
}

.product-image {
  width: 100%;
  height: 240px;
  object-fit: cover;
  transition: transform var(--transition-base);
  flex-shrink: 0;
}

.product-card:hover .product-image {
  transform: scale(1.05);
}

.product-info {
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.product-title {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-gray-900);
  margin-bottom: var(--space-2);
}

.product-description {
  color: var(--color-gray-600);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--space-4);
  flex-grow: 1;
}

/* 确保按钮在产品卡片底部对齐 */
.product-info .btn {
  margin-top: auto;
}

.product-price {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: var(--color-oxbot-600);
  margin-bottom: var(--space-4);
}

/* ==========================================================================
   导航组件 - Navigation
   ========================================================================== */

.navbar {
  background: rgba(0, 0, 0, 0.95);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-fixed);
  transition: all var(--transition-base);
}

.navbar.scrolled {
  background: rgba(0, 0, 0, 0.98);
  box-shadow: var(--shadow-lg);
}

.nav-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 80px;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.nav-logo {
  display: flex;
  align-items: center;
  color: white;
  font-size: var(--font-size-2xl);
  font-weight: 700;
  text-decoration: none;
}

.nav-logo img {
  height: 40px;
  width: auto;
  transition: transform var(--transition-base);
}

.nav-logo:hover img {
  transform: scale(1.05);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-8);
  list-style: none;
}

.nav-link {
  color: rgba(255, 255, 255, 0.9);
  font-weight: 500;
  text-decoration: none;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
  position: relative;
}

.nav-link:hover {
  color: var(--color-oxbot-400);
  background: rgba(255, 255, 255, 0.1);
}

.nav-link.active {
  color: var(--color-oxbot-400);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 50%;
  transform: translateX(-50%);
  width: 20px;
  height: 2px;
  background: var(--color-oxbot-400);
  border-radius: var(--radius-full);
}

/* 移动端菜单 */
.mobile-menu-button {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-2);
}

.mobile-menu-button span {
  width: 24px;
  height: 2px;
  background: white;
  border-radius: var(--radius-full);
  transition: all var(--transition-base);
}

.mobile-menu-button.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-button.active span:nth-child(2) {
  opacity: 0;
}

.mobile-menu-button.active span:nth-child(3) {
  transform: rotate(-45deg) translate(7px, -6px);
}

/* ==========================================================================
   Hero区域样式 - Hero Section
   ========================================================================== */

.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--color-gray-900) 0%, var(--color-oxbot-900) 50%, var(--color-gray-900) 100%);
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(circle at 30% 20%, rgba(59, 130, 246, 0.3) 0%, transparent 50%),
              radial-gradient(circle at 70% 80%, rgba(14, 165, 233, 0.3) 0%, transparent 50%);
  animation: heroGlow 8s ease-in-out infinite alternate;
}

@keyframes heroGlow {
  0% {
    opacity: 0.5;
  }
  100% {
    opacity: 0.8;
  }
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 1000px;
  padding: 0 var(--space-6);
}

.hero-title {
  font-size: clamp(2.5rem, 5vw, 4.5rem);
  font-weight: 800;
  color: white;
  margin-bottom: var(--space-6);
  line-height: var(--line-height-tight);
  letter-spacing: -0.02em;
}

.hero-title .gradient-text {
  background: linear-gradient(135deg, var(--color-oxbot-400), var(--color-primary-400));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: var(--font-size-xl);
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: var(--space-8);
  line-height: var(--line-height-relaxed);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.hero-buttons {
  display: flex;
  gap: var(--space-4);
  justify-content: center;
  flex-wrap: wrap;
}

/* 滚动指示器 */
.scroll-indicator {
  position: absolute;
  bottom: var(--space-8);
  left: 50%;
  transform: translateX(-50%);
  color: rgba(255, 255, 255, 0.6);
  animation: bounce 2s infinite;
}

@keyframes bounce {
  0%, 20%, 50%, 80%, 100% {
    transform: translateX(-50%) translateY(0);
  }
  40% {
    transform: translateX(-50%) translateY(-10px);
  }
  60% {
    transform: translateX(-50%) translateY(-5px);
  }
}

/* ==========================================================================
   特性卡片 - Feature Cards
   ========================================================================== */

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-8);
  margin-top: var(--space-12);
}

.feature-card {
  background: white;
  border-radius: var(--radius-2xl);
  padding: var(--space-8);
  box-shadow: var(--shadow-base);
  border: 1px solid var(--color-gray-100);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--color-oxbot-500), var(--color-primary-500));
  transform: scaleX(0);
  transition: transform var(--transition-base);
}

.feature-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
}

.feature-card:hover::before {
  transform: scaleX(1);
}

.feature-icon {
  width: 64px;
  height: 64px;
  border-radius: var(--radius-2xl);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-6);
  font-size: var(--font-size-2xl);
  color: white;
  background: linear-gradient(135deg, var(--color-oxbot-500), var(--color-primary-500));
}

.feature-title {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-gray-900);
  margin-bottom: var(--space-4);
}

.feature-description {
  color: var(--color-gray-600);
  line-height: var(--line-height-relaxed);
}

.feature-list {
  list-style: none;
  margin-top: var(--space-4);
}

.feature-list li {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
  color: var(--color-gray-600);
  line-height: var(--line-height-relaxed);
}

.feature-list li::before {
  content: '✓';
  color: var(--color-success-500);
  font-weight: 700;
  flex-shrink: 0;
  margin-top: 2px;
}

/* ==========================================================================
   页脚样式 - Footer
   ========================================================================== */

.footer {
  background: var(--color-gray-900);
  color: white;
  padding: var(--space-16) 0 var(--space-8);
  position: relative;
}

.footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-8);
  margin-bottom: var(--space-8);
}

.footer-section h3 {
  color: white;
  font-size: var(--font-size-lg);
  font-weight: 600;
  margin-bottom: var(--space-4);
}

.footer-section p,
.footer-section a {
  color: rgba(255, 255, 255, 0.7);
  line-height: var(--line-height-relaxed);
}

.footer-section a:hover {
  color: var(--color-oxbot-400);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: var(--space-8);
  text-align: center;
  color: rgba(255, 255, 255, 0.6);
}

/* ==========================================================================
   工具类 - Utility Classes
   ========================================================================== */

.text-gradient {
  background: linear-gradient(135deg, var(--color-oxbot-500), var(--color-primary-500));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.bg-gradient {
  background: linear-gradient(135deg, var(--color-oxbot-50), var(--color-primary-50));
}

.section-padding {
  padding: var(--space-20) 0;
}

.section-title {
  font-size: var(--font-size-4xl);
  font-weight: 700;
  text-align: center;
  margin-bottom: var(--space-4);
  color: var(--color-gray-900);
}

.section-subtitle {
  font-size: var(--font-size-lg);
  text-align: center;
  color: var(--color-gray-600);
  max-width: 600px;
  margin: 0 auto var(--space-12);
  line-height: var(--line-height-relaxed);
}

/* ==========================================================================
   动画和交互 - Animations & Interactions
   ========================================================================== */

.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: all var(--transition-slow);
}

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

.slide-in-left {
  opacity: 0;
  transform: translateX(-50px);
  transition: all var(--transition-slow);
}

.slide-in-left.visible {
  opacity: 1;
  transform: translateX(0);
}

.slide-in-right {
  opacity: 0;
  transform: translateX(50px);
  transition: all var(--transition-slow);
}

.slide-in-right.visible {
  opacity: 1;
  transform: translateX(0);
}

/* ==========================================================================
   响应式设计 - Responsive Design
   ========================================================================== */

@media (max-width: 1024px) {
  .hero-title {
    font-size: var(--font-size-5xl);
  }
  
  .feature-grid {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-6);
  }
}

@media (max-width: 768px) {
  .mobile-menu-button {
    display: flex;
  }
  
  .nav-links {
    display: none;
  }
  
  .hero-title {
    font-size: var(--font-size-4xl);
  }
  
  .hero-subtitle {
    font-size: var(--font-size-lg);
  }
  
  .hero-buttons {
    flex-direction: column;
    align-items: center;
  }
  
  .btn {
    width: 100%;
    max-width: 300px;
  }
  
  .feature-grid {
    grid-template-columns: 1fr;
    gap: var(--space-6);
  }
  
  .section-padding {
    padding: var(--space-16) 0;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 var(--space-4);
  }
  
  .hero-title {
    font-size: var(--font-size-3xl);
  }
  
  .hero-subtitle {
    font-size: var(--font-size-base);
  }
  
  .section-title {
    font-size: var(--font-size-3xl);
  }
  
  .feature-card {
    padding: var(--space-6);
  }

  .card {
    padding: var(--space-6);
    margin-bottom: var(--space-4);
  }

  .card .flex.items-start {
    flex-direction: column;
    gap: var(--space-4);
    text-align: center;
  }

  .card .w-12.h-12 {
    margin: 0 auto var(--space-4) auto;
  }
}

/* ==========================================================================
   模态框和弹窗 - Modals & Popups
   ========================================================================== */

.modal {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(4px);
  z-index: var(--z-modal);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
}

.modal.show {
  opacity: 1;
  visibility: visible;
}

.modal-content {
  background: white;
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-2xl);
  max-width: 90vw;
  max-height: 90vh;
  overflow: hidden;
  transform: scale(0.9);
  transition: transform var(--transition-base);
}

.modal.show .modal-content {
  transform: scale(1);
}

.modal-header {
  padding: var(--space-6);
  border-bottom: 1px solid var(--color-gray-200);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-title {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-gray-900);
}

.modal-close {
  background: none;
  border: none;
  font-size: var(--font-size-2xl);
  color: var(--color-gray-500);
  cursor: pointer;
  padding: var(--space-2);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.modal-close:hover {
  background: var(--color-gray-100);
  color: var(--color-gray-700);
}

.modal-body {
  padding: var(--space-6);
  max-height: 70vh;
  overflow-y: auto;
}

/* ==========================================================================
   加载状态 - Loading States
   ========================================================================== */

.loading {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-8);
}

.spinner {
  width: 40px;
  height: 40px;
  border: 4px solid var(--color-gray-200);
  border-top: 4px solid var(--color-oxbot-500);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* ==========================================================================
   打印样式 - Print Styles
   ========================================================================== */

/* ==========================================================================
   PDF 和额外模态框样式 - PDF & Additional Modal Styles
   ========================================================================== */

.modal-xl {
  max-width: 95vw;
  width: 95vw;
  height: 90vh;
}

.pdf-loading {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-12);
  text-align: center;
  color: var(--color-gray-600);
}

.loading-spinner {
  width: 40px;
  height: 40px;
  border: 4px solid var(--color-gray-200);
  border-top: 4px solid var(--color-oxbot-500);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin-bottom: var(--space-4);
}

.pdf-iframe {
  width: 100%;
  height: 70vh;
  border: none;
  border-radius: var(--radius-lg);
  display: none;
}

.pdf-fallback {
  margin-top: var(--space-4);
  text-align: center;
  color: var(--color-gray-600);
  font-size: var(--font-size-sm);
}

.close-modal {
  background: none;
  border: none;
  font-size: var(--font-size-xl);
  color: var(--color-gray-500);
  cursor: pointer;
  padding: var(--space-2);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.close-modal:hover {
  background: var(--color-gray-100);
  color: var(--color-gray-700);
}

/* ==========================================================================
   导航系统增强 - Enhanced Navigation System
   ========================================================================== */

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-4);
}

.nav-menu {
  display: flex;
  align-items: center;
}

.nav-dropdown {
  position: relative;
}

.nav-dropdown-btn {
  display: flex;
  align-items: center;
}

.nav-dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  margin-top: var(--space-2);
  width: 200px;
  background: white;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--color-gray-200);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: all var(--transition-base);
  z-index: var(--z-dropdown);
}

.nav-dropdown:hover .nav-dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.nav-dropdown-content {
  padding: var(--space-2);
}

.nav-dropdown-link {
  display: block;
  padding: var(--space-3) var(--space-4);
  color: var(--color-gray-700);
  text-decoration: none;
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  transition: all var(--transition-fast);
}

.nav-dropdown-link:hover {
  background: var(--color-gray-100);
  color: var(--color-oxbot-600);
}

.nav-dropdown-link.active {
  background: var(--color-oxbot-50);
  color: var(--color-oxbot-600);
}

.nav-mobile-btn {
  display: none;
}

.mobile-menu-toggle {
  background: none;
  border: none;
  color: white;
  cursor: pointer;
  padding: var(--space-2);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.mobile-menu-toggle:hover {
  color: var(--color-oxbot-400);
}

.mobile-menu-toggle.active {
  color: var(--color-oxbot-400);
}

.nav-mobile-menu {
  background: rgba(0, 0, 0, 0.95);
  backdrop-filter: blur(10px);
  position: fixed;
  top: 80px;
  left: 0;
  right: 0;
  z-index: var(--z-dropdown);
  transition: all var(--transition-base);
}

.nav-mobile-menu.hidden {
  display: none;
}

.nav-mobile-menu.show {
  display: block;
}

.nav-mobile-menu.active {
  display: block;
}

.nav-mobile-content {
  padding: var(--space-4);
}

.nav-mobile-link {
  display: block;
  padding: var(--space-3) var(--space-4);
  color: white;
  text-decoration: none;
  border-radius: var(--radius-md);
  font-size: var(--font-size-base);
  font-weight: 500;
  transition: all var(--transition-fast);
}

.nav-mobile-link:hover {
  color: var(--color-oxbot-400);
  background: rgba(255, 255, 255, 0.1);
}

.nav-mobile-link.active {
  color: var(--color-oxbot-400);
}

.nav-mobile-dropdown {
  padding: var(--space-3) var(--space-4);
}

.nav-mobile-dropdown-title {
  color: var(--color-gray-300);
  font-size: var(--font-size-base);
  font-weight: 500;
  margin-bottom: var(--space-2);
}

.nav-mobile-dropdown-title.active {
  color: var(--color-oxbot-400);
}

.nav-mobile-dropdown-content {
  margin-left: var(--space-4);
  margin-top: var(--space-2);
}

.nav-mobile-dropdown-link {
  display: block;
  padding: var(--space-2) var(--space-3);
  color: white;
  text-decoration: none;
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  transition: all var(--transition-fast);
}

.nav-mobile-dropdown-link:hover {
  color: var(--color-oxbot-400);
  background: rgba(255, 255, 255, 0.1);
}

.nav-mobile-dropdown-link.active {
  color: var(--color-oxbot-400);
}

@media (max-width: 768px) {
  .nav-menu {
    display: none;
  }
  
  .nav-mobile-btn {
    display: block;
  }
}

/* ==========================================================================
   页面特定样式优化 - Page-specific Style Optimizations
   ========================================================================== */

/* FAQ页面优化 */
.page-faq .card,
.page-download .card,
.page-warranty .card,
.page-about .card {
  margin-bottom: var(--space-8);
}

.page-faq .card:last-child,
.page-download .card:last-child,
.page-warranty .card:last-child,
.page-about .card:last-child {
  margin-bottom: 0;
}

/* 保修页面特殊样式 */
.warranty-content .space-y-10 > * + * {
  margin-top: var(--space-10);
}

.warranty-content .space-y-6 > * + * {
  margin-top: var(--space-6);
}

.warranty-content .space-y-3 > * + * {
  margin-top: var(--space-3);
}

.warranty-content .space-y-2 > * + * {
  margin-top: var(--space-2);
}

/* 关于我们页面特殊样式 */
.about-content .grid.gap-12 {
  gap: var(--space-12);
}

.about-content .space-y-8 > * + * {
  margin-top: var(--space-8);
}

/* 下载页面特殊样式 */
.download-content .grid.gap-6 {
  gap: var(--space-6);
}

.download-content .grid.gap-8 {
  gap: var(--space-8);
}

/* 内容区域优化 */
.content-area {
  max-width: 1000px;
  margin: 0 auto;
}

/* 文本内容优化 */
.text-content {
  line-height: var(--line-height-relaxed);
}

.text-content h3 {
  margin-top: var(--space-8);
  margin-bottom: var(--space-4);
  color: var(--color-gray-900);
  font-weight: 700;
}

.text-content h4 {
  margin-top: var(--space-6);
  margin-bottom: var(--space-3);
  color: var(--color-gray-800);
  font-weight: 600;
}

.text-content p {
  margin-bottom: var(--space-4);
  color: var(--color-gray-700);
}

.text-content ul,
.text-content ol {
  margin-bottom: var(--space-4);
  padding-left: var(--space-6);
}

.text-content li {
  margin-bottom: var(--space-2);
  color: var(--color-gray-700);
  position: relative;
}

.text-content ul li::before {
  content: '•';
  color: var(--color-oxbot-500);
  font-weight: bold;
  position: absolute;
  left: -1.2em;
}

.text-content .space-y-2 li {
  margin-bottom: var(--space-2);
}

.text-content .space-y-3 li {
  margin-bottom: var(--space-3);
}

/* 响应式文本优化 */
@media (max-width: 768px) {
  .text-content h3 {
    font-size: var(--font-size-lg);
    margin-top: var(--space-6);
  }
  
  .text-content h4 {
    font-size: var(--font-size-base);
    margin-top: var(--space-4);
  }
}

/* 页面加载动画优化 */
.page-faq .card,
.page-download .card,
.page-warranty .card,
.page-about .card {
  animation: cardSlideIn 0.6s ease-out forwards;
  opacity: 0;
  transform: translateY(30px);
}

.page-faq .card:nth-child(1) { animation-delay: 0.1s; }
.page-faq .card:nth-child(2) { animation-delay: 0.2s; }
.page-faq .card:nth-child(3) { animation-delay: 0.3s; }
.page-faq .card:nth-child(4) { animation-delay: 0.4s; }
.page-faq .card:nth-child(5) { animation-delay: 0.5s; }
.page-faq .card:nth-child(6) { animation-delay: 0.6s; }
.page-faq .card:nth-child(7) { animation-delay: 0.7s; }
.page-faq .card:nth-child(8) { animation-delay: 0.8s; }

@keyframes cardSlideIn {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* 图标旋转动画 */
.card:hover .fas,
.card:hover .fab {
  animation: iconPulse 0.6s ease-in-out;
}

@keyframes iconPulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.1); }
}

/* ==========================================================================
   微信二维码模态框样式 - WeChat QR Code Modal
   ========================================================================== */

.wechat-modal-content {
  max-width: 420px;
  width: 90%;
}

.wechat-qr-container {
  padding: var(--space-6);
}

.wechat-qr-image {
  width: 200px;
  height: 200px;
  border-radius: var(--radius-lg);
  border: 3px solid var(--color-gray-200);
  margin: 0 auto var(--space-4);
  box-shadow: var(--shadow-lg);
  transition: transform var(--transition-base);
}

.wechat-qr-image:hover {
  transform: scale(1.05);
}

.wechat-qr-text {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--color-gray-800);
  margin-bottom: var(--space-6);
}

.wechat-tips {
  background: linear-gradient(135deg, var(--color-gray-50), var(--color-gray-100));
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  border: 1px solid var(--color-gray-200);
}

.wechat-tips .fab.fa-weixin {
  font-size: var(--font-size-lg);
  margin-right: var(--space-2);
}

/* 移动端优化 */
@media (max-width: 480px) {
  .wechat-modal-content {
    width: 95%;
    margin: var(--space-4);
  }
  
  .wechat-qr-container {
    padding: var(--space-4);
  }
  
  .wechat-qr-image {
    width: 180px;
    height: 180px;
  }
  
  .wechat-qr-text {
    font-size: var(--font-size-base);
  }
  
  .modal-header {
    padding: var(--space-4) var(--space-6);
  }
  
  .modal-title {
    font-size: var(--font-size-lg);
  }
}

/* 为微信按钮添加特殊样式 */
.btn .fab.fa-weixin {
  color: #07c160;
  font-size: var(--font-size-lg);
  margin-right: var(--space-2);
}

.btn-outline:hover .fab.fa-weixin {
  color: white;
}

@media print {
  .navbar,
  .mobile-menu-button,
  .scroll-indicator,
  .modal {
    display: none !important;
  }
  
  .hero {
    min-height: auto;
    padding: var(--space-8) 0;
  }
  
  * {
    box-shadow: none !important;
  }
}