/* roulang page: index */
:root {
      --primary: #E94057;
      --primary-gradient: linear-gradient(135deg, #E94057 0%, #FF6B6B 100%);
      --secondary: #1A1A2E;
      --accent: #00F0FF;
      --neutral-light: #F5F5F7;
      --card-dark: rgba(45, 45, 58, 0.8);
      --white: #FFFFFF;
      --text-dark: #1A1A2E;
      --text-muted: #555;
      --text-light: rgba(255,255,255,0.7);
      --radius-lg: 12px;
      --radius-md: 8px;
      --shadow-card: 0 4px 20px rgba(0,0,0,0.08);
      --shadow-hover: 0 12px 32px rgba(233,64,87,0.15);
      --font-title: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
      --font-body: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
      --font-number: 'DIN Alternate', 'PingFang SC', sans-serif;
      --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-body);
      font-size: 16px;
      line-height: 1.7;
      background-color: var(--white);
      color: var(--text-dark);
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    h1, h2, h3, h4 {
      font-family: var(--font-title);
      letter-spacing: -0.5px;
    }
    h1 {
      font-size: 48px;
      line-height: 56px;
      font-weight: 800;
    }
    h2 {
      font-size: 36px;
      line-height: 44px;
      font-weight: 700;
    }
    h3 {
      font-size: 22px;
      line-height: 30px;
      font-weight: 600;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    img {
      max-width: 100%;
      display: block;
    }
    button, .btn {
      font-family: var(--font-body);
      font-weight: 600;
      font-size: 16px;
      letter-spacing: 0.5px;
      cursor: pointer;
      transition: var(--transition);
      border: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
    }
    /* 导航栏 SaaS 命令栏风格 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(26, 26, 46, 0.75);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(255,255,255,0.08);
      transition: background 0.3s;
    }
    .site-header.scrolled {
      background: rgba(26, 26, 46, 0.95);
      box-shadow: 0 4px 20px rgba(0,0,0,0.3);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo {
      font-size: 20px;
      font-weight: 700;
      color: var(--white);
      display: flex;
      align-items: center;
      gap: 6px;
      letter-spacing: 0.5px;
    }
    .logo-icon {
      width: 24px;
      height: 24px;
      background: var(--primary);
      clip-path: polygon(0 0, 85% 0, 100% 50%, 85% 100%, 0 100%);
      display: inline-block;
    }
    .nav-center {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-link {
      font-size: 15px;
      font-weight: 500;
      color: rgba(255,255,255,0.85);
      position: relative;
      padding: 4px 0;
      transition: color 0.2s;
    }
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width 0.2s;
    }
    .nav-link:hover {
      color: var(--white);
    }
    .nav-link:hover::after {
      width: 100%;
    }
    .nav-right {
      display: flex;
      align-items: center;
      gap: 16px;
    }
    .search-box {
      background: rgba(255,255,255,0.12);
      border-radius: 20px;
      padding: 8px 18px;
      display: flex;
      align-items: center;
      gap: 8px;
      border: 1px solid transparent;
      transition: var(--transition);
    }
    .search-box input {
      background: transparent;
      border: none;
      outline: none;
      color: var(--white);
      font-size: 14px;
      width: 140px;
    }
    .search-box input::placeholder {
      color: rgba(255,255,255,0.5);
    }
    .search-box:focus-within {
      border-color: var(--accent);
      background: rgba(255,255,255,0.18);
    }
    .icon-user {
      font-size: 20px;
      color: var(--white);
      opacity: 0.8;
      cursor: pointer;
    }
    .btn-primary {
      background: var(--primary-gradient);
      color: var(--white);
      padding: 10px 24px;
      border-radius: 30px;
      font-weight: 600;
      box-shadow: 0 4px 12px rgba(233,64,87,0.4);
    }
    .btn-primary:hover {
      box-shadow: 0 0 20px rgba(0,240,255,0.5);
      transform: translateY(-1px);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: transparent;
      border: none;
      padding: 8px;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--white);
      transition: var(--transition);
    }
    /* Hero */
    .hero {
      background: linear-gradient(135deg, #1A1A2E 0%, #16213E 100%);
      min-height: 100vh;
      display: flex;
      align-items: center;
      padding-top: 80px;
      position: relative;
      overflow: hidden;
    }
    .hero::before {
      content: '';
      position: absolute;
      width: 600px;
      height: 600px;
      background: radial-gradient(circle, rgba(233,64,87,0.25) 0%, transparent 70%);
      top: -100px;
      right: -100px;
      border-radius: 50%;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }
    .hero-left {
      position: relative;
      z-index: 2;
    }
    .hero-left h1 {
      color: var(--white);
      margin-bottom: 24px;
    }
    .hero-sub {
      font-size: 18px;
      color: rgba(255,255,255,0.7);
      margin-bottom: 40px;
      line-height: 1.6;
    }
    .hero-btns {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--primary);
      color: var(--primary);
      padding: 14px 32px;
      border-radius: 8px;
      font-weight: 600;
    }
    .btn-outline:hover {
      background: rgba(233,64,87,0.08);
    }
    .hero-right {
      position: relative;
      z-index: 2;
    }
    .hero-img {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: 24px;
      height: 420px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.5);
      border: 1px solid rgba(255,255,255,0.1);
    }
    /* 通用区块 */
    section {
      padding: 100px 0;
    }
    .bg-light {
      background: var(--neutral-light);
    }
    .bg-dark {
      background: var(--secondary);
      color: var(--white);
    }
    .section-title {
      text-align: center;
      margin-bottom: 60px;
    }
    .section-title h2 {
      margin-bottom: 16px;
    }
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }
    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 32px;
    }
    /* 痛点 */
    .pain-card {
      background: var(--white);
      padding: 32px 24px;
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-card);
      text-align: center;
      color: #666;
    }
    .pain-icon {
      font-size: 32px;
      margin-bottom: 16px;
      opacity: 0.7;
    }
    /* 解决方案卡片 */
    .solution-card {
      background: var(--white);
      padding: 40px 24px;
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      border: 1px solid transparent;
    }
    .solution-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-color: var(--accent);
    }
    .card-icon {
      font-size: 36px;
      color: var(--primary);
      margin-bottom: 20px;
    }
    /* 数据面板 */
    .stat-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 40px;
      text-align: center;
    }
    .stat-number {
      font-family: var(--font-number);
      font-size: 48px;
      font-weight: 700;
      color: var(--accent);
      margin-bottom: 8px;
    }
    .stat-label {
      color: rgba(255,255,255,0.7);
    }
    /* 证言 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }
    .testimonial-card {
      background: rgba(45,45,58,0.6);
      backdrop-filter: blur(8px);
      padding: 28px;
      border-radius: var(--radius-lg);
      border-left: 4px solid var(--primary);
    }
    .quote {
      font-size: 18px;
      margin-bottom: 20px;
      color: var(--white);
    }
    /* FAQ */
    .faq-item {
      background: var(--white);
      border-radius: var(--radius-md);
      margin-bottom: 16px;
      box-shadow: 0 2px 8px rgba(0,0,0,0.04);
    }
    .faq-question {
      padding: 20px 24px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      border-left: 4px solid var(--primary);
    }
    .faq-answer {
      padding: 0 24px 20px;
      color: #555;
      display: none;
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    /* CTA */
    .cta-section {
      background: #0F0F1A;
      text-align: center;
      padding: 100px 0;
    }
    /* 页脚 */
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 48px;
    }
    .footer-bottom {
      border-top: 1px solid rgba(255,255,255,0.1);
      margin-top: 48px;
      padding-top: 24px;
      text-align: center;
      color: rgba(255,255,255,0.5);
    }
    @media (max-width: 1024px) {
      .grid-4 { grid-template-columns: repeat(2, 1fr); }
      .stat-grid { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 768px) {
      .nav-center, .nav-right .search-box, .nav-right .btn-primary {
        display: none;
      }
      .hamburger { display: flex; }
      .hero-grid { grid-template-columns: 1fr; }
      .hero-right { order: -1; }
      h1 { font-size: 36px; line-height: 44px; }
      h2 { font-size: 28px; }
      .grid-3, .testimonial-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
    }