/* roulang page: index */
:root {
      --primary: #E43D23;
      --primary-hover: #C4321E;
      --secondary: #0B1A2F;
      --accent: #00D4AA;
      --white: #FFFFFF;
      --gray-light: #F5F6F8;
      --gray-mid: #8A919F;
      --text-dark: #1A1F2B;
      --text-soft: #5A6270;
      --border-light: rgba(11, 26, 47, 0.08);
      --shadow-card: 0 16px 32px rgba(11, 26, 47, 0.08), 0 4px 8px rgba(11, 26, 47, 0.04);
      --shadow-hover: 0 20px 36px rgba(11, 26, 47, 0.15), 0 6px 12px rgba(11, 26, 47, 0.06);
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-sm: 8px;
      --font-title: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
      --font-body: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
      --font-number: 'Inter', 'SF Mono', 'PingFang SC', monospace;
      --max-width: 1280px;
      --header-height: 72px;
    }

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

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

    body {
      font-family: var(--font-body);
      line-height: 1.75;
      color: var(--text-dark);
      background-color: var(--white);
      -webkit-font-smoothing: antialiased;
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s ease;
    }

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
    }

    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 32px;
    }

    /* 导航栏 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      height: var(--header-height);
      display: flex;
      align-items: center;
      transition: background 0.3s ease, backdrop-filter 0.3s ease;
      background: transparent;
      backdrop-filter: blur(0px);
    }

    .site-header.scrolled {
      background: rgba(11, 26, 47, 0.85);
      backdrop-filter: blur(12px);
      box-shadow: 0 4px 20px rgba(0,0,0,0.1);
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }

    .logo {
      display: flex;
      align-items: baseline;
      gap: 4px;
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--white);
      letter-spacing: 0.02em;
    }
    .logo .brand {
      color: var(--white);
    }
    .logo .domain {
      font-size: 0.7rem;
      font-weight: 400;
      opacity: 0.7;
      margin-left: 2px;
    }

    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
      list-style: none;
      font-weight: 500;
      color: rgba(255,255,255,0.9);
    }

    .nav-links a {
      color: inherit;
      font-size: 0.95rem;
      transition: color 0.2s;
    }
    .nav-links a:hover {
      color: var(--white);
    }

    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 12px 28px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      font-size: 0.95rem;
      transition: background 0.2s, transform 0.15s;
      display: inline-block;
      text-align: center;
      letter-spacing: 0.5px;
    }
    .btn-primary:hover {
      background: var(--primary-hover);
      transform: translateY(-2px);
    }

    .btn-outline {
      background: transparent;
      border: 1px solid rgba(255,255,255,0.5);
      color: white;
      padding: 12px 28px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      transition: all 0.2s;
    }
    .btn-outline:hover {
      background: var(--primary);
      border-color: var(--primary);
      transform: translateY(-2px);
    }

    .mobile-toggle {
      display: none;
      background: none;
      border: none;
      color: white;
      font-size: 1.8rem;
      line-height: 1;
    }

    /* Hero */
    .hero {
      height: 100vh;
      min-height: 700px;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      position: relative;
      display: flex;
      align-items: center;
      color: white;
    }
    .hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(11,26,47,0.75) 0%, rgba(11,26,47,0.3) 100%);
    }
    .hero-content {
      position: relative;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
      width: 100%;
    }
    .hero-text h1 {
      font-family: var(--font-title);
      font-weight: 800;
      font-size: 3.5rem;
      line-height: 1.15;
      margin-bottom: 1.5rem;
      letter-spacing: 0.02em;
    }
    .hero-text p {
      font-size: 1.2rem;
      opacity: 0.9;
      margin-bottom: 2rem;
      max-width: 480px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .hero-preview {
      background: rgba(255,255,255,0.08);
      backdrop-filter: blur(8px);
      border-radius: var(--radius-lg);
      padding: 16px;
      border: 1px solid rgba(255,255,255,0.15);
      box-shadow: 0 20px 40px rgba(0,0,0,0.3);
    }
    .preview-card {
      background: #0a111f;
      border-radius: var(--radius-md);
      overflow: hidden;
    }
    .preview-card img {
      width: 100%;
      height: auto;
      display: block;
    }
    .live-bar {
      display: flex;
      justify-content: space-between;
      padding: 12px;
      background: #111c2b;
      color: var(--accent);
      font-weight: 600;
      font-size: 0.9rem;
    }

    /* 通用板块 */
    section {
      padding: 100px 0;
    }
    .section-title {
      font-family: var(--font-title);
      font-weight: 700;
      font-size: 2.5rem;
      margin-bottom: 0.75rem;
      letter-spacing: 0.02em;
    }
    .section-sub {
      color: var(--text-soft);
      font-size: 1.1rem;
      max-width: 600px;
    }

    /* 痛点 */
    .problem-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 2fr;
      gap: 40px;
      align-items: center;
    }
    .pain-item {
      display: flex;
      gap: 16px;
      margin-bottom: 28px;
      align-items: flex-start;
    }
    .pain-icon {
      font-size: 1.8rem;
      color: var(--primary);
    }
    .pain-right img {
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-card);
    }

    /* 解决方案滚动 */
    .scroll-cards {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      scroll-snap-type: x mandatory;
      padding-bottom: 16px;
      -webkit-overflow-scrolling: touch;
      scrollbar-width: none;
    }
    .scroll-cards::-webkit-scrollbar { display: none; }
    .solution-card {
      flex: 0 0 320px;
      scroll-snap-align: start;
      background: white;
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: 0 4px 12px rgba(0,0,0,0.04);
      border-left: 4px solid var(--primary);
      transition: transform 0.25s, box-shadow 0.25s;
    }
    .solution-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }

    /* 优势网格 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .feature-card {
      background: var(--gray-light);
      border-radius: var(--radius-md);
      padding: 28px 20px;
      text-align: center;
      transition: 0.2s;
    }
    .feature-card:hover {
      background: white;
      box-shadow: var(--shadow-card);
    }
    .feature-icon {
      font-size: 2.8rem;
      color: var(--primary);
      margin-bottom: 16px;
    }

    /* 数据统计 */
    .stats-band {
      background: var(--gray-light);
    }
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      text-align: center;
    }
    .stat-number {
      font-family: var(--font-number);
      font-weight: 700;
      font-size: 3rem;
      color: var(--accent);
    }

    /* 证言 */
    .testimonial-bg {
      background: var(--secondary);
      color: white;
    }
    .testimonial-slide {
      text-align: center;
      padding: 20px;
    }
    .quote {
      font-size: 1.6rem;
      font-weight: 500;
      font-style: italic;
      margin-bottom: 24px;
    }

    /* FAQ */
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 16px 0;
    }
    .faq-question {
      font-weight: 700;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
    }

    /* CTA */
    .cta-dark {
      background: var(--secondary);
      color: white;
      text-align: center;
      padding: 80px 0;
    }

    /* Footer */
    .footer {
      background: var(--secondary);
      color: #b0b8c5;
      padding: 60px 0 24px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 40px;
    }

    @media (max-width: 1024px) {
      .hero-content { grid-template-columns: 1fr; }
      .features-grid { grid-template-columns: repeat(2,1fr); }
      .problem-grid { grid-template-columns: 1fr; }
    }
    @media (max-width: 768px) {
      .container { padding: 0 20px; }
      .nav-links { display: none; }
      .mobile-toggle { display: block; }
      .hero-text h1 { font-size: 2.4rem; }
      .stats-grid { grid-template-columns: repeat(2,1fr); }
      .faq-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      .scroll-cards { flex-wrap: nowrap; overflow-x: auto; }
    }