/* =====================================================
   ClawWork - AI 智能助手官网样式
   技术栈: 纯CSS3 + CSS变量 + CSS动画
   风格: 深色科技风 + 赛博朋克 / 支持浅色模式
   ===================================================== */

/* =====================================================
   0. 本地字体定义
   ===================================================== */
@font-face {
  font-family: 'Orbitron';
  src: url('../fonts/Orbitron-Regular.ttf') format('truetype');
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: 'Orbitron';
  src: url('../fonts/Orbitron-Bold.ttf') format('truetype');
  font-weight: 700;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: 'Orbitron';
  src: url('../fonts/Orbitron-Black.ttf') format('truetype');
  font-weight: 900;
  font-style: normal;
  font-display: swap;
}

/* =====================================================
   1. CSS变量 - 设计系统
   ===================================================== */

/* 深色模式 (默认) */
:root,
[data-theme="dark"] {
  /* 主色调 */
  --primary-color: #00b8d4;
  --primary-hover: #00d4f5;
  --secondary-color: #6b21a8;
  --accent-color: #db2777;
  --brand-orange: #ea580c;
  --brand-red: #dc2626;

  /* 背景色 */
  --bg-primary: #0a0a0f;
  --bg-secondary: #111118;
  --bg-card: rgba(20, 20, 35, 0.8);
  --bg-card-hover: rgba(30, 30, 50, 0.9);
  --bg-gradient-start: rgba(10, 10, 15, 0.98);
  --bg-gradient-end: transparent;

  /* 文字色 */
  --text-primary: #f8fafc;
  --text-secondary: rgba(248, 250, 252, 0.75);
  --text-muted: rgba(248, 250, 252, 0.55);
  --text-hint: rgba(248, 250, 252, 0.4);

  /* 边框 */
  --border-color: rgba(234, 88, 12, 0.25);
  --border-glow: rgba(0, 184, 212, 0.4);
  --border-light: rgba(255, 255, 255, 0.08);

  /* 阴影 */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.5);
  --shadow-glow-primary: 0 0 30px rgba(0, 184, 212, 0.4);
  --shadow-glow-orange: 0 0 30px rgba(234, 88, 12, 0.4);

  /* 粒子/装饰 */
  --particle-color-1: #00b8d4;
  --particle-color-2: #6b21a8;
  --particle-color-3: #ea580c;
  --particle-color-4: #dc2626;

  /* 导航背景 */
  --navbar-bg: linear-gradient(180deg, rgba(10, 10, 15, 0.98) 0%, transparent 100%);
  --navbar-blur: blur(15px);

  /* 网格背景 */
  --grid-color: rgba(0, 184, 212, 0.04);

  /* 表格 */
  --table-header-bg: linear-gradient(135deg, rgba(234, 88, 12, 0.2), rgba(0, 184, 212, 0.1));
  --table-row-hover: rgba(234, 88, 12, 0.08);

  /* 二维码区域 */
  --qr-bg: #ffffff;
  --qr-shadow: 0 0 30px rgba(234, 88, 12, 0.3), 0 0 60px rgba(0, 184, 212, 0.2);

  /* 模态框 */
  --modal-bg: rgba(20, 20, 35, 0.98);
  --modal-overlay: rgba(0, 0, 0, 0.8);

  /* 按钮 */
  --btn-ghost-bg: rgba(234, 88, 12, 0.12);
  --btn-ghost-border: var(--brand-orange);
  --btn-ghost-text: var(--brand-orange);
}

/* 浅色模式 */
[data-theme="light"] {
  /* 主色调 - 稍微调暗以提高对比度 */
  --primary-color: #0891b2;
  --primary-hover: #0e7490;
  --secondary-color: #7c3aed;
  --accent-color: #db2777;
  --brand-orange: #c2410c;
  --brand-red: #b91c1c;

  /* 背景色 */
  --bg-primary: #f8fafc;
  --bg-secondary: #f1f5f9;
  --bg-card: rgba(255, 255, 255, 0.9);
  --bg-card-hover: rgba(255, 255, 255, 1);
  --bg-gradient-start: rgba(248, 250, 252, 0.98);
  --bg-gradient-end: transparent;

  /* 文字色 */
  --text-primary: #0f172a;
  --text-secondary: rgba(15, 23, 42, 0.75);
  --text-muted: rgba(15, 23, 42, 0.6);
  --text-hint: rgba(15, 23, 42, 0.45);

  /* 边框 */
  --border-color: rgba(194, 65, 12, 0.25);
  --border-glow: rgba(8, 145, 178, 0.4);
  --border-light: rgba(15, 23, 42, 0.1);

  /* 阴影 */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.12);
  --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.15);
  --shadow-glow-primary: 0 0 30px rgba(8, 145, 178, 0.25);
  --shadow-glow-orange: 0 0 30px rgba(194, 65, 12, 0.25);

  /* 粒子/装饰 */
  --particle-color-1: #0891b2;
  --particle-color-2: #7c3aed;
  --particle-color-3: #c2410c;
  --particle-color-4: #b91c1c;

  /* 导航背景 */
  --navbar-bg: linear-gradient(180deg, rgba(248, 250, 252, 0.98) 0%, transparent 100%);
  --navbar-blur: blur(15px);

  /* 网格背景 */
  --grid-color: rgba(8, 145, 178, 0.08);

  /* 表格 */
  --table-header-bg: linear-gradient(135deg, rgba(194, 65, 12, 0.1), rgba(8, 145, 178, 0.08));
  --table-row-hover: rgba(194, 65, 12, 0.06);

  /* 二维码区域 */
  --qr-bg: #ffffff;
  --qr-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);

  /* 模态框 */
  --modal-bg: rgba(255, 255, 255, 0.98);
  --modal-overlay: rgba(15, 23, 42, 0.5);

  /* 按钮 */
  --btn-ghost-bg: rgba(194, 65, 12, 0.1);
  --btn-ghost-border: var(--brand-orange);
  --btn-ghost-text: var(--brand-orange);
}

:root {
  /* 过渡 */
  --transition-fast: 150ms ease;
  --transition-normal: 300ms ease;
  --transition-slow: 500ms ease;
  --transition-theme: 400ms ease;

  /* 圆角 */
  --radius-sm: 10px;
  --radius-md: 15px;
  --radius-lg: 20px;
  --radius-xl: 30px;

  /* z-index 层级 */
  --z-base: 1;
  --z-dropdown: 100;
  --z-sticky: 500;
  --z-fixed: 1000;
  --z-modal: 2000;
  --z-tooltip: 3000;
}

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

html {
  scroll-behavior: smooth;
  /* 响应式根字体 - 适应DPI缩放 */
  font-size: clamp(14px, 1.25vw, 16px);
}

body {
  font-family: 'Segoe UI', -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  overflow-x: hidden;
  overflow-y: auto;
  line-height: 1.6;
  min-width: 320px;
  transition: background-color var(--transition-theme), color var(--transition-theme);
}

/* 尊重用户减少动画偏好 */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* =====================================================
   3. 导航栏
   ===================================================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  padding: 15px 50px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  z-index: var(--z-fixed);
  background: var(--navbar-bg);
  backdrop-filter: var(--navbar-blur);
  -webkit-backdrop-filter: var(--navbar-blur);
  transition: background var(--transition-theme);
}

.logo-container {
  display: flex;
  align-items: center;
  gap: 15px;
}

.logo-icon {
  width: 45px;
  height: 45px;
  border-radius: 12px;
  object-fit: contain;
  box-shadow: 0 0 20px rgba(255, 107, 53, 0.4);
  animation: logoGlow 3s ease-in-out infinite;
}

@keyframes logoGlow {
  0%, 100% { box-shadow: 0 0 20px rgba(255, 107, 53, 0.4); }
  50% { box-shadow: 0 0 35px rgba(255, 107, 53, 0.7), 0 0 50px rgba(0, 240, 255, 0.3); }
}

.logo-text {
  font-family: 'Orbitron', sans-serif;
  font-size: 26px;
  font-weight: 900;
  background: linear-gradient(135deg, var(--primary-color), var(--brand-orange));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.nav-buttons {
  display: flex;
  gap: 12px;
  align-items: center;
}

/* 主题切换按钮 */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  padding: 0;
  background: var(--btn-ghost-bg);
  border: 2px solid var(--border-color);
  border-radius: 50%;
  cursor: pointer;
  transition: all var(--transition-normal);
  color: var(--text-secondary);
}

.theme-toggle:hover {
  background: var(--brand-orange);
  border-color: var(--brand-orange);
  color: #fff;
  transform: rotate(15deg);
  box-shadow: var(--shadow-glow-orange);
}

.theme-toggle:focus-visible {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}

.theme-toggle svg {
  width: 20px;
  height: 20px;
  transition: transform var(--transition-normal);
}

.theme-toggle:hover svg {
  transform: scale(1.1);
}

/* 亮色模式图标隐藏/显示 */
.theme-toggle .icon-sun {
  display: none;
}

.theme-toggle .icon-moon {
  display: block;
}

[data-theme="light"] .theme-toggle .icon-sun {
  display: block;
}

[data-theme="light"] .theme-toggle .icon-moon {
  display: none;
}

/* 汉堡菜单 - 移动端 */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 10px;
  z-index: var(--z-fixed);
}

.hamburger span {
  display: block;
  width: 25px;
  height: 2px;
  background: var(--primary-color);
  transition: var(--transition-normal);
}

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

.hamburger.active span:nth-child(2) {
  opacity: 0;
}

.hamburger.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* 移动端菜单 */
.mobile-menu {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(10, 10, 15, 0.98);
  backdrop-filter: blur(20px);
  z-index: calc(var(--z-fixed) - 1);
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 20px;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition-normal);
}

.mobile-menu.active {
  opacity: 1;
  visibility: visible;
}

.mobile-menu .btn {
  width: 200px;
  justify-content: center;
  padding: 15px 30px;
  font-size: 16px;
}

/* =====================================================
   4. 按钮样式
   ===================================================== */
.btn {
  padding: 12px 24px;
  border: none;
  border-radius: 30px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-normal);
  text-transform: uppercase;
  letter-spacing: 1px;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.btn:focus-visible {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}

.btn-manual {
  background: rgba(255, 107, 53, 0.15);
  border: 2px solid var(--brand-orange);
  color: var(--brand-orange);
}

.btn-manual:hover,
.btn-manual:focus {
  background: var(--brand-orange);
  color: var(--text-primary);
  box-shadow: 0 0 30px rgba(255, 107, 53, 0.5);
}

.btn-outline {
  background: transparent;
  border: 2px solid var(--primary-color);
  color: var(--primary-color);
}

.btn-outline:hover,
.btn-outline:focus {
  background: var(--primary-color);
  color: var(--bg-dark);
  box-shadow: 0 0 30px rgba(0, 240, 255, 0.5);
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  color: var(--text-primary);
  border: none;
}

.btn-primary:hover,
.btn-primary:focus {
  transform: translateY(-2px);
  box-shadow: 0 10px 40px rgba(123, 47, 255, 0.4);
}

/* =====================================================
   5. Hero Section - 第一屏
   ===================================================== */
.hero-section {
  min-height: 100vh;
  min-height: clamp(600px, 100vh, auto);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  position: relative;
  overflow: visible;
  padding: clamp(90px, 12vh, 120px) 20px clamp(40px, 5vh, 60px);
}

/* 动态背景 */
.bg-animation {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  z-index: -1;
}

.bg-animation::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background:
    radial-gradient(circle at 20% 80%, rgba(255, 107, 53, 0.12) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(0, 240, 255, 0.12) 0%, transparent 50%),
    radial-gradient(circle at 50% 50%, rgba(123, 47, 255, 0.1) 0%, transparent 40%);
  animation: bgMove 20s ease-in-out infinite;
}

@keyframes bgMove {
  0%, 100% { transform: translate(0, 0) rotate(0deg); }
  25% { transform: translate(2%, 2%) rotate(1deg); }
  50% { transform: translate(-1%, 3%) rotate(-1deg); }
  75% { transform: translate(3%, -2%) rotate(2deg); }
}

/* 网格背景 */
.grid-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image:
    linear-gradient(rgba(0, 240, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 240, 255, 0.03) 1px, transparent 1px);
  background-size: 50px 50px;
  z-index: -1;
}

/* 粒子效果 */
.particles {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  pointer-events: none;
}

.particle {
  position: absolute;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  animation: float 15s infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(100vh) scale(0); opacity: 0; }
  10% { opacity: 1; }
  90% { opacity: 1; }
  100% { transform: translateY(-100vh) scale(1); opacity: 0; }
}

/* Hero Logo */
.hero-logo-container {
  position: relative;
  margin-bottom: 30px;
}

.hero-logo {
  width: 150px;
  height: 150px;
  border-radius: 30px;
  object-fit: contain;
  animation: heroLogoFloat 4s ease-in-out infinite;
  filter: drop-shadow(0 0 30px rgba(255, 107, 53, 0.5));
}

@keyframes heroLogoFloat {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-15px); }
}

.hero-logo-ring {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 200px;
  height: 200px;
  border: 2px solid rgba(255, 107, 53, 0.3);
  border-radius: 50%;
  animation: ringPulse 3s ease-in-out infinite;
}

@keyframes ringPulse {
  0%, 100% { transform: translate(-50%, -50%) scale(1); opacity: 0.5; }
  50% { transform: translate(-50%, -50%) scale(1.2); opacity: 0; }
}

/* 主标题 */
.hero-title {
  font-family: 'Orbitron', sans-serif;
  font-size: clamp(50px, 10vw, 120px);
  font-weight: 900;
  text-align: center;
  position: relative;
  margin-bottom: 20px;
}

.hero-title span {
  background: linear-gradient(135deg, #fff 0%, var(--primary-color) 30%, var(--brand-orange) 70%, var(--secondary-color) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: titleGlow 3s ease-in-out infinite;
}

@keyframes titleGlow {
  0%, 100% { filter: drop-shadow(0 0 20px rgba(0, 240, 255, 0.5)); }
  50% { filter: drop-shadow(0 0 40px rgba(255, 107, 53, 0.8)); }
}

.hero-subtitle {
  font-size: clamp(18px, 3vw, 22px);
  color: var(--text-secondary);
  margin-bottom: 15px;
  letter-spacing: 2px;
  text-align: center;
}

.hero-tagline {
  font-size: clamp(16px, 2.5vw, 18px);
  color: var(--brand-orange);
  margin-bottom: 40px;
  font-weight: 600;
  letter-spacing: 1px;
  text-align: center;
}

.hero-buttons {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
  justify-content: center;
}

/* 公司信息 */
.company-info {
  position: absolute;
  bottom: 20px;
  right: 30px;
  font-size: 12px;
  color: var(--text-hint);
  letter-spacing: 1px;
}

/* Hero 底部功能卡片 */
.hero-features {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: clamp(8px, 1rem, 1rem);
  padding: 0 clamp(10px, 2vw, 20px);
  max-width: min(1200px, 90vw);
  margin: clamp(20px, 3vw, 40px) auto clamp(30px, 4vw, 50px);
  width: 100%;
}

.hero-features .feature-card {
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.04), rgba(255, 255, 255, 0.01));
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-lg);
  padding: 24px 16px;
  text-align: center;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: all var(--transition-normal);
  cursor: pointer;
  position: relative;
}

.hero-features .feature-card:hover {
  transform: translateY(-5px);
  border-color: var(--brand-orange);
  box-shadow: 0 15px 40px rgba(255, 107, 53, 0.15);
}

.hero-features .feature-card:hover::before {
  opacity: 1;
}

.hero-features .feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--brand-orange), var(--primary-color));
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.hero-features .feature-icon {
  width: 48px;
  height: 48px;
  margin: 0 auto 12px;
  background: linear-gradient(135deg, rgba(255, 107, 53, 0.15), rgba(0, 184, 212, 0.15));
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-normal);
}

.hero-features .feature-card:hover .feature-icon {
  transform: scale(1.1);
  background: linear-gradient(135deg, rgba(255, 107, 53, 0.25), rgba(0, 184, 212, 0.25));
}

.hero-features .feature-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.hero-features .feature-desc {
  font-size: 11px;
  color: var(--text-muted);
  line-height: 1.4;
}

@media (max-width: 768px) {
  .hero-features {
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    padding: 0 15px;
    margin: 30px auto 0;
  }

  .hero-features .feature-card {
    padding: 18px 12px;
  }

  .hero-features .feature-icon {
    width: 40px;
    height: 40px;
    margin-bottom: 8px;
  }

  .hero-features .feature-title {
    font-size: 12px;
  }

  .hero-features .feature-desc {
    font-size: 10px;
  }
}

/* =====================================================
   6. 功能特色条 - Features Strip (QClaw Style)
   ===================================================== */
.features-strip {
  padding: 60px 50px;
  background: linear-gradient(180deg, transparent, rgba(255, 107, 53, 0.02), transparent);
}

.features-strip-container {
  max-width: 1200px;
  margin: 0 auto;
}

.features-strip-title {
  font-family: 'Orbitron', sans-serif;
  font-size: clamp(24px, 4vw, 32px);
  text-align: center;
  margin-bottom: 40px;
  background: linear-gradient(135deg, var(--primary-color), var(--brand-orange));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
}

.feature-card {
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.04), rgba(255, 255, 255, 0.01));
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-lg);
  padding: 28px 20px;
  text-align: center;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: all var(--transition-normal);
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--brand-orange), var(--primary-color));
  opacity: 0;
  transition: opacity var(--transition-normal);
}

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

.feature-card:hover {
  transform: translateY(-8px);
  border-color: var(--brand-orange);
  box-shadow: 0 20px 50px rgba(255, 107, 53, 0.15);
}

.feature-icon {
  width: 56px;
  height: 56px;
  margin: 0 auto 16px;
  background: linear-gradient(135deg, rgba(255, 107, 53, 0.15), rgba(0, 184, 212, 0.15));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 26px;
  transition: all var(--transition-normal);
}

.feature-card:hover .feature-icon {
  transform: scale(1.1);
  background: linear-gradient(135deg, rgba(255, 107, 53, 0.25), rgba(0, 184, 212, 0.25));
}

.feature-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 10px;
}

.feature-desc {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.5;
}

/* =====================================================
   7. 三步上手区域 - How It Works (QClaw Style)
   ===================================================== */
.how-it-works {
  padding: 80px 50px;
  background: linear-gradient(180deg, rgba(255, 107, 53, 0.02), transparent);
}

.how-it-works-container {
  max-width: 1000px;
  margin: 0 auto;
}

.how-it-works-title {
  font-family: 'Orbitron', sans-serif;
  font-size: clamp(24px, 4vw, 32px);
  text-align: center;
  margin-bottom: 50px;
  background: linear-gradient(135deg, var(--primary-color), var(--brand-orange));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.steps-row {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  gap: 20px;
}

.step-item {
  flex: 1;
  text-align: center;
  max-width: 280px;
  position: relative;
}

.step-number {
  width: 64px;
  height: 64px;
  margin: 0 auto 20px;
  background: linear-gradient(135deg, var(--brand-orange), var(--primary-color));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Orbitron', sans-serif;
  font-size: 24px;
  font-weight: 700;
  color: #fff;
  box-shadow: 0 8px 30px rgba(255, 107, 53, 0.3);
  position: relative;
  z-index: 2;
}

.step-icon {
  width: 48px;
  height: 48px;
  margin: 0 auto 16px;
  background: var(--bg-card);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
}

.step-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 10px;
}

.step-desc {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.6;
}

/* 步骤连接箭头 */
.step-connector {
  display: flex;
  align-items: center;
  justify-content: center;
  padding-top: 28px;
  color: var(--brand-orange);
  font-size: 28px;
  opacity: 0.6;
}

.step-connector svg {
  width: 32px;
  height: 32px;
  stroke: var(--brand-orange);
  stroke-width: 2;
}

/* =====================================================
   8. 场景演示区域 - Demo Grid (QClaw Style)
   ===================================================== */
.demos-section {
  padding: 80px 50px;
  background: linear-gradient(180deg, transparent, rgba(255, 107, 53, 0.02), transparent);
}

.demos-container {
  max-width: 1100px;
  margin: 0 auto;
}

.demos-title {
  font-family: 'Orbitron', sans-serif;
  font-size: clamp(24px, 4vw, 32px);
  text-align: center;
  margin-bottom: 15px;
  background: linear-gradient(135deg, var(--primary-color), var(--brand-orange));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.demos-subtitle {
  text-align: center;
  color: var(--text-muted);
  font-size: 16px;
  margin-bottom: 50px;
}

.demos-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.demo-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 30px;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.demo-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--brand-orange), var(--primary-color));
}

.demo-card:hover {
  transform: translateY(-5px);
  border-color: var(--brand-orange);
  box-shadow: 0 20px 50px rgba(255, 107, 53, 0.12);
}

.demo-card-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
}

.demo-card-icon {
  width: 44px;
  height: 44px;
  background: linear-gradient(135deg, rgba(255, 107, 53, 0.15), rgba(0, 184, 212, 0.15));
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
}

.demo-card-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
}

.demo-card-desc {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 20px;
}

/* 聊天气泡演示 */
.chat-demo {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.chat-bubble {
  max-width: 85%;
  padding: 12px 16px;
  border-radius: var(--radius-md);
  font-size: 13px;
  line-height: 1.5;
}

.chat-bubble.user {
  align-self: flex-end;
  background: linear-gradient(135deg, var(--brand-orange), var(--brand-red));
  color: #fff;
  border-bottom-right-radius: 4px;
}

.chat-bubble.ai {
  align-self: flex-start;
  background: rgba(0, 184, 212, 0.1);
  border: 1px solid rgba(0, 184, 212, 0.2);
  color: var(--text-primary);
  border-bottom-left-radius: 4px;
}

/* 功能标签 */
.feature-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 15px;
}

.feature-tag {
  padding: 6px 12px;
  background: rgba(255, 107, 53, 0.1);
  border: 1px solid rgba(255, 107, 53, 0.2);
  border-radius: 20px;
  font-size: 12px;
  color: var(--brand-orange);
}

/* =====================================================
   9. CTA区域 (QClaw Style)
   ===================================================== */
.cta-section {
  padding: 100px 50px;
  background: linear-gradient(180deg, transparent, rgba(255, 107, 53, 0.03), transparent);
  text-align: center;
}

.cta-container {
  max-width: 700px;
  margin: 0 auto;
}

.cta-card {
  background: linear-gradient(135deg, rgba(255, 107, 53, 0.08), rgba(0, 184, 212, 0.05));
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 60px 40px;
  position: relative;
  overflow: hidden;
}

.cta-card::before {
  content: '';
  position: absolute;
  top: -100px;
  left: 50%;
  transform: translateX(-50%);
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, rgba(255, 107, 53, 0.15) 0%, transparent 70%);
  pointer-events: none;
}

.cta-title {
  font-family: 'Orbitron', sans-serif;
  font-size: clamp(28px, 4vw, 36px);
  margin-bottom: 15px;
  background: linear-gradient(135deg, var(--primary-color), var(--brand-orange));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  position: relative;
}

.cta-desc {
  font-size: 16px;
  color: var(--text-muted);
  margin-bottom: 35px;
  line-height: 1.7;
  position: relative;
}

.cta-buttons {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  position: relative;
}

/* =====================================================
   10. 浮动光晕效果
   ===================================================== */
.floating-orbs {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: -1;
  overflow: hidden;
}

.orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.4;
  animation: orbFloat 20s ease-in-out infinite;
}

.orb-1 {
  width: 400px;
  height: 400px;
  background: var(--brand-orange);
  top: 10%;
  left: -10%;
  animation-delay: 0s;
}

.orb-2 {
  width: 350px;
  height: 350px;
  background: var(--primary-color);
  top: 60%;
  right: -10%;
  animation-delay: -5s;
}

.orb-3 {
  width: 300px;
  height: 300px;
  background: var(--secondary-color);
  bottom: 10%;
  left: 30%;
  animation-delay: -10s;
}

@keyframes orbFloat {
  0%, 100% { transform: translate(0, 0) scale(1); }
  25% { transform: translate(50px, 30px) scale(1.1); }
  50% { transform: translate(-30px, 60px) scale(0.9); }
  75% { transform: translate(40px, -20px) scale(1.05); }
}

/* =====================================================
   11. 产品介绍区域 (原有 - 保留兼容)
   ===================================================== */
.intro-section {
  padding: 80px 50px;
  background: linear-gradient(180deg, transparent, rgba(255, 107, 53, 0.03), transparent);
}

.intro-container {
  max-width: 1100px;
  margin: 0 auto;
}

.intro-title {
  font-family: 'Orbitron', sans-serif;
  font-size: clamp(26px, 4vw, 36px);
  text-align: center;
  margin-bottom: 50px;
  background: linear-gradient(135deg, var(--primary-color), var(--brand-orange));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.intro-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 25px;
}

.intro-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 30px;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
  cursor: pointer;
}

.intro-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--brand-orange), var(--primary-color));
}

.intro-card:hover,
.intro-card:focus-within {
  transform: translateY(-8px);
  border-color: var(--brand-orange);
  box-shadow: 0 15px 40px rgba(255, 107, 53, 0.2);
}

.intro-card-icon {
  width: 50px;
  height: 50px;
  background: linear-gradient(135deg, rgba(255, 107, 53, 0.2), rgba(0, 240, 255, 0.2));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 26px;
  margin-bottom: 15px;
}

.intro-card h3 {
  font-size: 18px;
  margin-bottom: 10px;
  color: var(--text-primary);
}

.intro-card p {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.6;
}

/* 卡片展开状态 */
.intro-card.expanded {
  grid-column: span 2;
  transform: none;
  border-color: var(--brand-orange);
  box-shadow: 0 20px 60px rgba(255, 107, 53, 0.15);
}

@media (max-width: 900px) {
  .intro-card.expanded {
    grid-column: span 1;
  }
}

.intro-card .card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
}

.intro-card .expand-icon {
  width: 24px;
  height: 24px;
  color: var(--text-muted);
  transition: transform var(--transition-normal);
  flex-shrink: 0;
}

.intro-card.expanded .expand-icon {
  transform: rotate(180deg);
}

/* 展开内容区域 */
.intro-card .demo-content {
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transition: max-height 0.4s ease, opacity 0.3s ease, margin 0.3s ease;
  margin-top: 0;
}

.intro-card.expanded .demo-content {
  max-height: 500px;
  opacity: 1;
  margin-top: 25px;
}

/* 演示界面容器 */
.demo-interface {
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
  overflow: hidden;
}

/* 演示头部 */
.demo-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 15px;
  background: var(--border-light);
  border-bottom: 1px solid var(--border-light);
}

.demo-dots {
  display: flex;
  gap: 6px;
}

.demo-dots span {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.demo-dots span:nth-child(1) { background: #ff5f57; }
.demo-dots span:nth-child(2) { background: #ffbd2e; }
.demo-dots span:nth-child(3) { background: #28ca41; }

.demo-title {
  font-size: 12px;
  color: var(--text-muted);
  margin-left: 10px;
}

/* 演示主体 */
.demo-body {
  padding: 20px;
  min-height: 200px;
}

/* 上传区域样式 */
.demo-upload-area {
  border: 2px dashed var(--border-color);
  border-radius: var(--radius-md);
  padding: 30px;
  text-align: center;
  transition: all var(--transition-normal);
}

.demo-upload-area:hover {
  border-color: var(--brand-orange);
  background: rgba(255, 107, 53, 0.05);
}

.demo-upload-icon {
  font-size: 36px;
  margin-bottom: 10px;
  opacity: 0.7;
}

.demo-upload-text {
  font-size: 13px;
  color: var(--text-muted);
}

.demo-upload-formats {
  font-size: 11px;
  color: var(--text-hint);
  margin-top: 8px;
}

/* 操作按钮组 */
.demo-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

.demo-action-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 10px 16px;
  background: var(--btn-ghost-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 12px;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.demo-action-btn:hover {
  background: var(--brand-orange);
  border-color: var(--brand-orange);
  color: #fff;
  transform: translateY(-2px);
}

/* 进度条 */
.demo-progress {
  margin-top: 20px;
}

.demo-progress-bar {
  height: 6px;
  background: var(--border-light);
  border-radius: 3px;
  overflow: hidden;
}

.demo-progress-fill {
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--brand-orange), var(--primary-color));
  border-radius: 3px;
  animation: progressFill 2s ease-out forwards;
}

@keyframes progressFill {
  0% { width: 0; }
  100% { width: 100%; }
}

.demo-progress-text {
  display: flex;
  justify-content: space-between;
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 8px;
}

/* 代码编辑器模拟 */
.demo-code-editor {
  background: #1e1e2e;
  border-radius: var(--radius-sm);
  padding: 15px;
  font-family: 'Monaco', 'Consolas', monospace;
  font-size: 12px;
  line-height: 1.6;
  overflow-x: auto;
}

.demo-code-line {
  display: flex;
  gap: 15px;
}

.demo-line-num {
  color: #6c7086;
  user-select: none;
  min-width: 20px;
  text-align: right;
}

.demo-code-content {
  color: #cdd6f4;
}

.demo-code-keyword { color: #cba6f7; }
.demo-code-string { color: #a6e3a1; }
.demo-code-comment { color: #6c7086; }
.demo-code-function { color: #89b4fa; }

/* 聊天气泡 */
.demo-chat {
  display: flex;
  flex-direction: column;
  gap: 15px;
}

.demo-chat-bubble {
  max-width: 85%;
  padding: 12px 16px;
  border-radius: var(--radius-md);
  font-size: 13px;
  line-height: 1.5;
  animation: bubbleIn 0.3s ease;
}

@keyframes bubbleIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.demo-chat-bubble.user {
  align-self: flex-end;
  background: linear-gradient(135deg, var(--brand-orange), var(--brand-red));
  color: #fff;
  border-bottom-right-radius: 4px;
}

.demo-chat-bubble.ai {
  align-self: flex-start;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-bottom-left-radius: 4px;
}

.demo-typing {
  display: flex;
  gap: 4px;
  padding: 8px 0;
}

.demo-typing span {
  width: 6px;
  height: 6px;
  background: var(--text-muted);
  border-radius: 50%;
  animation: typing 1.4s infinite;
}

.demo-typing span:nth-child(2) { animation-delay: 0.2s; }
.demo-typing span:nth-child(3) { animation-delay: 0.4s; }

@keyframes typing {
  0%, 60%, 100% { opacity: 0.3; }
  30% { opacity: 1; }
}

/* 数据可视化 */
.demo-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 15px;
  margin-top: 15px;
}

.demo-stat-item {
  text-align: center;
  padding: 15px;
  background: var(--bg-card);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-light);
}

.demo-stat-value {
  font-size: 24px;
  font-weight: 700;
  background: linear-gradient(135deg, var(--primary-color), var(--brand-orange));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.demo-stat-label {
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 5px;
}

/* 热点列表 */
.demo-hot-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.demo-hot-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px;
  background: var(--bg-card);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-light);
  transition: all var(--transition-fast);
}

.demo-hot-item:hover {
  border-color: var(--brand-orange);
  transform: translateX(5px);
}

.demo-hot-rank {
  width: 24px;
  height: 24px;
  background: linear-gradient(135deg, var(--brand-orange), var(--brand-red));
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 700;
  color: #fff;
}

.demo-hot-tag {
  flex: 1;
  font-size: 13px;
}

.demo-hot-heat {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 12px;
  color: var(--brand-orange);
}

/* 平台状态 */
.demo-platforms {
  display: flex;
  gap: 10px;
  margin-top: 15px;
}

.demo-platform {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 15px 10px;
  background: var(--bg-card);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-light);
  transition: all var(--transition-fast);
}

.demo-platform.published {
  border-color: #28ca41;
}

.demo-platform-icon {
  font-size: 24px;
}

.demo-platform-status {
  font-size: 18px;
}

.demo-platform-name {
  font-size: 11px;
  color: var(--text-muted);
}

/* 图表区域 */
.demo-chart-area {
  display: flex;
  align-items: flex-end;
  justify-content: space-around;
  height: 120px;
  padding: 20px;
  background: var(--bg-card);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-light);
  margin-top: 15px;
}

.demo-chart-bar {
  width: 30px;
  background: linear-gradient(180deg, var(--brand-orange), var(--primary-color));
  border-radius: 4px 4px 0 0;
  animation: barGrow 1s ease-out forwards;
  transform-origin: bottom;
}

@keyframes barGrow {
  from { transform: scaleY(0); }
  to { transform: scaleY(1); }
}

/* 图片处理流程 */
.demo-image-flow {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 20px;
}

.demo-flow-step {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.demo-flow-icon {
  width: 50px;
  height: 50px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
}

.demo-flow-label {
  font-size: 11px;
  color: var(--text-muted);
}

.demo-flow-arrow {
  color: var(--brand-orange);
  font-size: 20px;
  animation: arrowPulse 1s infinite;
}

@keyframes arrowPulse {
  0%, 100% { opacity: 0.5; transform: translateX(0); }
  50% { opacity: 1; transform: translateX(3px); }
}

/* 处理步骤 */
.demo-steps {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.demo-step {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px;
  background: var(--bg-card);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-light);
}

.demo-step.completed {
  border-color: #28ca41;
}

.demo-step.processing {
  border-color: var(--brand-orange);
  animation: stepPulse 1.5s infinite;
}

@keyframes stepPulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(255, 107, 53, 0.3); }
  50% { box-shadow: 0 0 0 8px rgba(255, 107, 53, 0); }
}

.demo-step-icon {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  background: var(--border-light);
}

.demo-step.completed .demo-step-icon {
  background: #28ca41;
  color: #fff;
}

.demo-step.processing .demo-step-icon {
  background: var(--brand-orange);
  animation: spin 1s linear infinite;
}

@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.demo-step-text {
  font-size: 13px;
  flex: 1;
}

/* 工具栏 */
.demo-toolbar, .demo-tool-btn {
  display: flex;
  gap: 8px;
}

.demo-toolbar {
  padding: 10px;
  background: var(--border-light);
  border-radius: var(--radius-sm);
  margin-bottom: 15px;
}

.demo-tool-btn {
  padding: 8px 14px;
  background: transparent;
  border: 1px solid transparent;
  border-radius: 6px;
  color: var(--text-secondary);
  font-size: 12px;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.demo-tool-btn:hover,
.demo-tool-btn.active {
  background: var(--bg-card);
  border-color: var(--border-color);
  color: var(--brand-orange);
}

/* 代码编辑器 */
.demo-code-editor {
  background: #1e1e2e;
  border-radius: var(--radius-sm);
  padding: 15px;
  font-family: 'Monaco', 'Consolas', monospace;
  font-size: 12px;
  line-height: 1.8;
}

.demo-code-line {
  display: flex;
  gap: 15px;
}

.demo-line-num {
  color: #6c7086;
  user-select: none;
  min-width: 20px;
  text-align: right;
}

.demo-code-content {
  color: #cdd6f4;
}

.demo-code-keyword { color: #cba6f7; }
.demo-code-string { color: #a6e3a1; }
.demo-code-comment { color: #6c7086; }
.demo-code-function { color: #89b4fa; }

/* 图片处理流程 */
.demo-image-flow {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 15px;
}

.demo-flow-step {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}

.demo-flow-icon {
  width: 44px;
  height: 44px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
}

.demo-flow-label {
  font-size: 11px;
  color: var(--text-muted);
}

.demo-flow-arrow {
  color: var(--brand-orange);
  font-size: 16px;
  animation: arrowPulse 1s infinite;
}

/* 热点列表 */
.demo-hot-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.demo-hot-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  background: var(--bg-card);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-light);
  transition: all var(--transition-fast);
}

.demo-hot-item:hover {
  border-color: var(--brand-orange);
  transform: translateX(3px);
}

.demo-hot-rank {
  width: 22px;
  height: 22px;
  background: linear-gradient(135deg, var(--brand-orange), var(--brand-red));
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  font-weight: 700;
  color: #fff;
}

.demo-hot-tag {
  flex: 1;
  font-size: 12px;
}

.demo-hot-heat {
  font-size: 11px;
  color: var(--brand-orange);
}

/* 平台状态 */
.demo-platforms {
  display: flex;
  gap: 8px;
  margin-top: 12px;
}

.demo-platform {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 10px 8px;
  background: var(--bg-card);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-light);
  transition: all var(--transition-fast);
}

.demo-platform.published {
  border-color: #28ca41;
}

.demo-platform-icon {
  font-size: 18px;
}

.demo-platform-status {
  font-size: 14px;
}

.demo-platform-name {
  font-size: 10px;
  color: var(--text-muted);
}

/* 处理步骤 */
.demo-steps {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.demo-step {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  background: var(--bg-card);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-light);
}

.demo-step.completed {
  border-color: #28ca41;
}

.demo-step.processing {
  border-color: var(--brand-orange);
  animation: stepPulse 1.5s infinite;
}

.demo-step-icon {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  background: var(--border-light);
}

.demo-step.completed .demo-step-icon {
  background: #28ca41;
  color: #fff;
}

.demo-step.processing .demo-step-icon {
  background: var(--brand-orange);
  animation: spin 1s linear infinite;
}

/* 数据统计 */
.demo-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-top: 15px;
}

.demo-stat-item {
  text-align: center;
  padding: 12px 8px;
  background: var(--bg-card);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-light);
}

.demo-stat-value {
  font-size: 20px;
  font-weight: 700;
  background: linear-gradient(135deg, var(--primary-color), var(--brand-orange));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.demo-stat-label {
  font-size: 10px;
  color: var(--text-muted);
  margin-top: 4px;
}

/* 卡片头部样式 */
.intro-card .card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
}

.intro-card .expand-icon {
  color: var(--text-muted);
  transition: transform var(--transition-normal);
  flex-shrink: 0;
  opacity: 0.6;
}

.intro-card:hover .expand-icon {
  opacity: 1;
}

.intro-card.expanded .expand-icon {
  transform: rotate(180deg);
}

/* =====================================================
   7. 应用场景表格区域
   ===================================================== */
.scenarios-section {
  padding: 80px 50px;
  background: linear-gradient(180deg, rgba(255, 107, 53, 0.03), transparent);
}

.scenarios-container {
  max-width: 1200px;
  margin: 0 auto;
}

.scenarios-table-wrapper {
  overflow-x: auto;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  -webkit-overflow-scrolling: touch;
}

.scenarios-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 800px;
}

.scenarios-table thead {
  background: linear-gradient(135deg, rgba(255, 107, 53, 0.2), rgba(0, 240, 255, 0.1));
}

.scenarios-table th {
  padding: 20px 15px;
  text-align: left;
  font-weight: 700;
  font-size: 15px;
  color: var(--primary-color);
  border-bottom: 2px solid rgba(255, 107, 53, 0.3);
  white-space: nowrap;
}

.scenarios-table th:first-child {
  border-radius: 19px 0 0 0;
}

.scenarios-table th:last-child {
  border-radius: 0 19px 0 0;
}

.scenarios-table td {
  padding: 18px 15px;
  font-size: 14px;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border-light);
  vertical-align: top;
  line-height: 1.6;
}

.scenarios-table tbody tr {
  transition: var(--transition-normal);
}

.scenarios-table tbody tr:hover {
  background: var(--table-row-hover);
}

.scenarios-table tbody tr:last-child td {
  border-bottom: none;
}

.scenarios-table tbody tr:last-child td:first-child {
  border-radius: 0 0 0 19px;
}

.scenarios-table tbody tr:last-child td:last-child {
  border-radius: 0 0 19px 0;
}

.field-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  background: linear-gradient(135deg, rgba(255, 107, 53, 0.2), rgba(0, 240, 255, 0.1));
  border-radius: 20px;
  font-weight: 600;
  color: var(--brand-orange);
  font-size: 13px;
  white-space: nowrap;
}

.person-tag {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 5px 12px;
  background: rgba(0, 240, 255, 0.1);
  border-radius: 15px;
  font-size: 13px;
  color: var(--primary-color);
}

.pain-point {
  color: var(--text-muted);
}

.solution {
  color: var(--primary-color);
  font-weight: 500;
}

.example-box {
  background: var(--border-light);
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--brand-orange);
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* =====================================================
   8. 下载区域
   ===================================================== */
.download-section {
  min-height: 100vh;
  padding: 100px 50px;
  display: flex;
  flex-direction: column;
  align-items: center;
  position: relative;
}

/* 下载区域头部CTA文案 */
.download-header-text {
  text-align: center;
  margin-bottom: 40px;
}

.cta-headline {
  font-family: 'Orbitron', sans-serif;
  font-size: clamp(28px, 4vw, 42px);
  font-weight: 700;
  margin-bottom: 16px;
  background: linear-gradient(135deg, var(--primary-color), var(--brand-orange));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.cta-tagline {
  color: var(--text-secondary);
  font-size: clamp(15px, 2vw, 18px);
  max-width: 600px;
  line-height: 1.7;
}

.section-title {
  font-family: 'Orbitron', sans-serif;
  font-size: clamp(32px, 5vw, 48px);
  margin-bottom: 20px;
  text-align: center;
  background: linear-gradient(135deg, var(--primary-color), var(--brand-orange));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.section-subtitle {
  color: var(--text-muted);
  font-size: clamp(16px, 2vw, 18px);
  margin-bottom: 50px;
  text-align: center;
}

/* 页签导航 */
.download-tabs {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin-bottom: 50px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  padding-bottom: 5px;
}

.tab-btn {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 15px 40px;
  background: transparent;
  border: none;
  border-bottom: 3px solid transparent;
  color: var(--text-muted);
  font-size: 18px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition-normal);
  margin-bottom: -5px;
}

.tab-btn:hover,
.tab-btn:focus {
  color: var(--text-secondary);
}

.tab-btn:focus-visible {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}

.tab-btn.active {
  color: var(--brand-orange);
  border-bottom-color: var(--brand-orange);
}

/* 下载内容区域 */
.download-content {
  max-width: 1100px;
  width: 100%;
  display: none;
}

.download-content.active {
  display: flex;
  gap: 60px;
  align-items: center;
  animation: fadeIn 0.4s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

/* 左侧文字区域 */
.download-info {
  flex: 1;
}

.download-title {
  font-size: clamp(24px, 4vw, 36px);
  font-weight: 700;
  margin-bottom: 15px;
  color: var(--text-primary);
}

.download-title span {
  color: var(--brand-orange);
}

.download-desc {
  font-size: 16px;
  color: var(--text-muted);
  line-height: 1.8;
  margin-bottom: 30px;
}

.download-features {
  list-style: none;
  margin-bottom: 35px;
}

.download-features li {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 0;
  color: var(--text-secondary);
  font-size: 15px;
}

.download-features li::before {
  content: '✓';
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  background: rgba(0, 240, 255, 0.15);
  border-radius: 50%;
  color: var(--primary-color);
  font-size: 12px;
  font-weight: bold;
  flex-shrink: 0;
}

/* 按钮组 */
.download-buttons {
  display: flex;
  gap: 15px;
  flex-wrap: wrap;
}

.dl-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 16px 35px;
  border-radius: var(--radius-md);
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition-normal);
  border: none;
}

.dl-btn:focus-visible {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}

.dl-btn-primary {
  background: linear-gradient(135deg, var(--brand-orange), var(--brand-red));
  color: var(--text-primary);
}

.dl-btn-primary:hover,
.dl-btn-primary:focus {
  transform: translateY(-3px);
  box-shadow: 0 15px 40px rgba(255, 107, 53, 0.4);
}

.dl-btn-secondary {
  background: rgba(0, 240, 255, 0.1);
  border: 2px solid var(--primary-color);
  color: var(--primary-color);
}

.dl-btn-secondary:hover,
.dl-btn-secondary:focus {
  background: var(--primary-color);
  color: var(--bg-dark);
}

.chip-hint {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 15px;
  color: var(--primary-color);
  font-size: 14px;
  cursor: pointer;
  text-decoration: none;
  transition: var(--transition-fast);
}

.chip-hint:hover,
.chip-hint:focus {
  text-decoration: underline;
}

.version-info {
  margin-top: 20px;
  padding-top: 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  color: var(--text-hint);
  font-size: 13px;
}

.btn-version-below {
  display: block;
  text-align: center;
  margin-top: 10px;
  color: var(--text-hint);
  font-size: 12px;
}

.download-buttons-wrapper {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.chip-hint-blue {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 15px;
  color: #4da6ff;
  font-size: 14px;
  cursor: pointer;
  text-decoration: none;
  transition: var(--transition-fast);
}

.chip-hint-blue:hover,
.chip-hint-blue:focus {
  color: #66b3ff;
  text-decoration: underline;
}

/* 右侧图片区域 */
.download-preview {
  flex: 1.5;
  max-width: 750px;
}

.preview-image {
  width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  box-shadow:
    0 25px 80px rgba(0, 0, 0, 0.5),
    0 0 0 1px rgba(255, 255, 255, 0.1);
  transition: transform var(--transition-slow);
}

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

/* =====================================================
   9. 联系方式区域
   ===================================================== */
.contact-section {
  min-height: 100vh;
  padding: 100px 50px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  position: relative;
  background: linear-gradient(180deg, transparent 0%, rgba(255, 107, 53, 0.03) 50%, transparent 100%);
}

.contact-container {
  max-width: 1100px;
  width: 100%;
  text-align: center;
}

.contact-columns {
  display: flex;
  gap: 30px;
  align-items: stretch;
}

.contact-columns .contact-card {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
}

.contact-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 60px 40px;
  position: relative;
  overflow: hidden;
}

.contact-card::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(255, 107, 53, 0.05) 0%, transparent 50%);
  animation: contactGlow 10s linear infinite;
}

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

/* 微信二维码区域 */
.wechat-section {
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
}

/* 视频教程区域 */
.video-section {
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.video-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.video-subtitle {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.video-scan-hint {
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 20px;
}

.wechat-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 20px;
}

.qr-code-wrapper {
  display: inline-block;
  padding: 15px;
  background: #fff;
  border-radius: var(--radius-lg);
  box-shadow:
    0 0 30px rgba(255, 107, 53, 0.3),
    0 0 60px rgba(0, 240, 255, 0.2);
  transition: var(--transition-normal);
  position: relative;
}

.qr-code-wrapper:hover {
  transform: scale(1.05);
  box-shadow:
    0 0 40px rgba(255, 107, 53, 0.5),
    0 0 80px rgba(0, 240, 255, 0.3);
}

.qr-code-wrapper::before {
  content: '';
  position: absolute;
  top: -3px;
  left: -3px;
  right: -3px;
  bottom: -3px;
  background: linear-gradient(135deg, var(--brand-orange), var(--primary-color), var(--secondary-color));
  border-radius: 23px;
  z-index: -1;
  animation: borderRotate 3s linear infinite;
}

@keyframes borderRotate {
  0% { filter: hue-rotate(0deg); }
  100% { filter: hue-rotate(360deg); }
}

.qr-code {
  width: 200px;
  height: 200px;
  background: linear-gradient(135deg, #f0f0f0, #e0e0e0);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #999;
  font-size: 14px;
  flex-direction: column;
  gap: 10px;
}

.qr-code img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  border-radius: var(--radius-sm);
}

.wechat-hint {
  margin-top: 20px;
  color: var(--text-muted);
  font-size: 14px;
}

/* 联系方式图标列表 */
.contact-methods {
  display: flex;
  justify-content: center;
  gap: 30px;
  margin-top: 40px;
}

.contact-method {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-muted);
  font-size: 14px;
  transition: var(--transition-normal);
  cursor: pointer;
}

.contact-method:hover,
.contact-method:focus {
  color: var(--brand-orange);
}

.contact-method-icon {
  width: 40px;
  height: 40px;
  background: rgba(255, 107, 53, 0.1);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  transition: var(--transition-normal);
}

.contact-method:hover .contact-method-icon,
.contact-method:focus .contact-method-icon {
  background: rgba(255, 107, 53, 0.2);
  transform: translateY(-3px);
}

/* =====================================================
   10. 模态框
   ===================================================== */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--modal-overlay);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  display: none;
  justify-content: center;
  align-items: center;
  z-index: var(--z-modal);
}

.modal-overlay.active {
  display: flex;
}

.modal {
  background: var(--modal-bg);
  border: 1px solid var(--border-glow);
  border-radius: var(--radius-xl);
  padding: 50px;
  width: 100%;
  max-width: 420px;
  position: relative;
  animation: modalIn 0.3s ease;
  margin: 20px;
  transition: background var(--transition-theme), border-color var(--transition-theme);
}

@keyframes modalIn {
  from { opacity: 0; transform: scale(0.9) translateY(20px); }
  to { opacity: 1; transform: scale(1) translateY(0); }
}

.modal-close {
  position: absolute;
  top: 20px;
  right: 20px;
  width: 40px;
  height: 40px;
  background: var(--border-light);
  border: none;
  border-radius: 50%;
  color: var(--text-primary);
  font-size: 24px;
  cursor: pointer;
  transition: var(--transition-normal);
  display: flex;
  align-items: center;
  justify-content: center;
}

.modal-close:hover,
.modal-close:focus {
  background: var(--accent-color);
}

.modal-close:focus-visible {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}

.modal-title {
  font-family: 'Orbitron', sans-serif;
  font-size: 28px;
  text-align: center;
  margin-bottom: 30px;
  background: linear-gradient(135deg, var(--primary-color), var(--brand-orange));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  margin-bottom: 8px;
  color: var(--text-secondary);
  font-size: 14px;
}

.form-group input {
  width: 100%;
  padding: 15px 20px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(0, 240, 255, 0.2);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 16px;
  transition: var(--transition-normal);
}

.form-group input:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 20px rgba(0, 240, 255, 0.2);
}

.form-group input::placeholder {
  color: rgba(255, 255, 255, 0.3);
}

.form-btn {
  width: 100%;
  padding: 15px;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  border: none;
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition-normal);
  margin-top: 10px;
}

.form-btn:hover,
.form-btn:focus {
  box-shadow: 0 10px 30px rgba(123, 47, 255, 0.4);
}

.form-btn:focus-visible {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}

.form-switch {
  text-align: center;
  margin-top: 25px;
  color: var(--text-muted);
  font-size: 14px;
}

.form-switch a {
  color: var(--brand-orange);
  text-decoration: none;
  cursor: pointer;
}

.form-switch a:hover,
.form-switch a:focus {
  text-decoration: underline;
}

/* =====================================================
   11. 芯片类型确认弹窗
   ===================================================== */
.chip-modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.85);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  display: none;
  justify-content: center;
  align-items: center;
  z-index: var(--z-tooltip);
}

.chip-modal-overlay.active {
  display: flex;
}

.chip-modal {
  background: linear-gradient(135deg, rgba(30, 30, 50, 0.98), rgba(20, 20, 35, 0.98));
  border: 1px solid var(--border-glow);
  border-radius: 25px;
  padding: 45px;
  width: 100%;
  max-width: 580px;
  position: relative;
  animation: chipModalIn 0.3s ease;
  margin: 20px;
}

@keyframes chipModalIn {
  from { opacity: 0; transform: scale(0.9) translateY(20px); }
  to { opacity: 1; transform: scale(1) translateY(0); }
}

.chip-modal-close {
  position: absolute;
  top: 15px;
  right: 15px;
  width: 36px;
  height: 36px;
  background: rgba(255, 255, 255, 0.1);
  border: none;
  border-radius: 50%;
  color: var(--text-primary);
  font-size: 22px;
  cursor: pointer;
  transition: var(--transition-normal);
  display: flex;
  align-items: center;
  justify-content: center;
}

.chip-modal-close:hover,
.chip-modal-close:focus {
  background: var(--accent-color);
}

.chip-modal-title {
  font-family: 'Orbitron', sans-serif;
  font-size: 24px;
  text-align: center;
  margin-bottom: 30px;
  background: linear-gradient(135deg, var(--primary-color), var(--brand-orange));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.chip-modal-buttons {
  display: flex;
  gap: 15px;
  margin-bottom: 35px;
}

.chip-modal-btn {
  flex: 1;
  padding: 18px 20px;
  border-radius: var(--radius-md);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition-normal);
  border: none;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 5px;
}

.chip-modal-btn:focus-visible {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}

.chip-modal-btn-primary {
  background: linear-gradient(135deg, var(--brand-orange), var(--brand-red));
  color: var(--text-primary);
}

.chip-modal-btn-primary:hover,
.chip-modal-btn-primary:focus {
  transform: translateY(-3px);
  box-shadow: 0 10px 30px rgba(255, 107, 53, 0.4);
}

.chip-modal-btn-secondary {
  background: rgba(0, 240, 255, 0.1);
  border: 2px solid var(--primary-color);
  color: var(--primary-color);
}

.chip-modal-btn-secondary:hover,
.chip-modal-btn-secondary:focus {
  background: var(--primary-color);
  color: var(--bg-dark);
}

.chip-modal-btn .btn-version {
  font-size: 11px;
  opacity: 0.7;
  font-weight: 400;
}

.chip-modal-guide {
  background: rgba(255, 255, 255, 0.03);
  border-radius: var(--radius-md);
  padding: 25px;
}

.chip-modal-guide-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--primary-color);
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.chip-step {
  display: flex;
  gap: 15px;
  margin-bottom: 18px;
}

.chip-step:last-child {
  margin-bottom: 0;
}

.chip-step-num {
  width: 28px;
  height: 28px;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 700;
  color: var(--text-primary);
  flex-shrink: 0;
}

.chip-step-content {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
}

.chip-step-content strong {
  color: var(--text-primary);
}

/* =====================================================
   12. 页脚
   ===================================================== */
.footer {
  padding: 40px 50px;
  text-align: center;
  border-top: 1px solid rgba(255, 107, 53, 0.1);
}

.footer p {
  color: var(--text-hint);
  font-size: 14px;
}

.footer-logo {
  width: 40px;
  height: 40px;
  margin-bottom: 15px;
  opacity: 0.5;
}

/* =====================================================
   13. 动画效果
   ===================================================== */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.8s ease;
}

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

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

/* 大屏幕 */
@media (max-width: 1200px) {
  .download-content.active {
    gap: 40px;
  }
}

/* 中等屏幕 - 平板 */
@media (max-width: 900px) {
  .scenarios-section {
    padding: 50px 15px;
  }

  .scenarios-table th,
  .scenarios-table td {
    padding: 12px 10px;
    font-size: 12px;
  }

  .field-tag {
    padding: 4px 10px;
    font-size: 11px;
  }

  .example-box {
    padding: 8px 10px;
    font-size: 11px;
  }

  .download-section {
    padding: 60px 20px;
  }

  .download-tabs {
    gap: 5px;
  }

  .tab-btn {
    padding: 12px 25px;
    font-size: 15px;
  }

  .download-content.active {
    flex-direction: column;
    gap: 40px;
  }

  .download-title {
    font-size: 28px;
  }

  .download-desc {
    font-size: 14px;
  }

  .download-preview {
    max-width: 100%;
  }

  .download-buttons {
    flex-direction: column;
  }

  .dl-btn {
    justify-content: center;
  }
}

/* 移动端 */
@media (max-width: 768px) {
  .navbar {
    padding: 12px 15px;
  }

  .nav-buttons {
    display: none;
  }

  .hamburger {
    display: flex;
  }

  .mobile-menu {
    display: flex;
  }

  .hero-logo {
    width: 100px;
    height: 100px;
  }

  .hero-logo-ring {
    width: 140px;
    height: 140px;
  }

  .intro-section {
    padding: 50px 20px;
  }

  .intro-title {
    font-size: 26px;
  }

  /* 新区域响应式 */
  .features-strip {
    padding: 40px 20px;
  }

  .features-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }

  .feature-card {
    padding: 20px 15px;
  }

  .feature-icon {
    width: 44px;
    height: 44px;
    font-size: 20px;
  }

  .feature-title {
    font-size: 14px;
  }

  .feature-desc {
    font-size: 12px;
  }

  .how-it-works {
    padding: 50px 20px;
  }

  .steps-row {
    flex-direction: column;
    align-items: center;
    gap: 30px;
  }

  .step-connector {
    transform: rotate(90deg);
    padding-top: 0;
  }

  .step-number {
    width: 50px;
    height: 50px;
    font-size: 20px;
  }

  .demos-section {
    padding: 50px 20px;
  }

  .demos-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .demo-card {
    padding: 20px;
  }

  .cta-section {
    padding: 60px 20px;
  }

  .cta-card {
    padding: 40px 25px;
  }

  .download-section,
  .contact-section {
    padding: 60px 20px;
  }

  .section-title {
    font-size: 32px;
  }

  .contact-card {
    padding: 40px 25px;
  }

  .contact-columns {
    flex-direction: column;
  }

  .qr-code {
    width: 180px;
    height: 180px;
  }

  .modal {
    margin: 20px;
    padding: 30px;
  }

  .company-info {
    position: static;
    text-align: center;
    margin-top: 20px;
  }
}

/* 小屏幕手机 */
@media (max-width: 500px) {
  .tab-btn {
    padding: 10px 18px;
    font-size: 14px;
  }

  .section-title {
    font-size: 28px;
  }

  .download-title {
    font-size: 24px;
  }

  .chip-modal {
    padding: 30px 20px;
  }

  .chip-modal-buttons {
    flex-direction: column;
  }
}