/* roulang page: index */
:root {
      --primary: #0A0E17;
      --accent-red: #FF3C00;
      --highlight-cyan: #00F0FF;
      --card-bg: #141A26;
      --text-primary: #EDF0F5;
      --text-secondary: #8A92A6;
      --border-color: #1E2636;
      --footer-bg: #060A10;
      --gradient-cta: linear-gradient(135deg, #FF3C00 0%, #FF6B35 100%);
      --radius-sm: 8px;
      --radius-md: 12px;
      --shadow-glow: 0 8px 24px rgba(0,240,255,0.08);
      --font-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      --font-mono: "Inter", "Roboto", sans-serif;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--primary);
      color: var(--text-primary);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航栏 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(10, 14, 23, 0.92);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid transparent;
      transition: border-color 0.3s ease;
    }
    .navbar.scrolled {
      border-bottom-color: var(--border-color);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    .logo {
      font-size: 1.8rem;
      font-weight: 800;
      letter-spacing: 1px;
      color: var(--text-primary);
      text-decoration: none;
      white-space: nowrap;
    }
    .logo span {
      color: var(--highlight-cyan);
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 28px;
    }
    .nav-links a {
      color: var(--text-secondary);
      text-decoration: none;
      font-weight: 500;
      font-size: 0.95rem;
      transition: color 0.2s;
      position: relative;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--highlight-cyan);
    }
    .nav-cta {
      background: var(--accent-red);
      color: white !important;
      padding: 10px 22px;
      border-radius: 4px;
      font-weight: 600;
      transition: all 0.2s;
    }
    .nav-cta:hover {
      background: #e63200;
      transform: translateY(-1px);
      box-shadow: 0 4px 14px rgba(255,60,0,0.4);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 6px;
      background: transparent;
      border: none;
      cursor: pointer;
      padding: 8px;
    }
    .hamburger span {
      width: 26px;
      height: 2px;
      background: var(--text-primary);
      transition: all 0.3s;
      display: block;
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: 72px;
      left: 0;
      width: 100%;
      background: rgba(10, 14, 23, 0.98);
      backdrop-filter: blur(20px);
      padding: 32px 24px;
      flex-direction: column;
      gap: 24px;
      border-bottom: 1px solid var(--border-color);
      z-index: 999;
    }
    .mobile-menu a {
      color: var(--text-secondary);
      font-size: 1.2rem;
      text-decoration: none;
      font-weight: 500;
      display: block;
    }
    .mobile-menu .nav-cta {
      display: inline-block;
      text-align: center;
      width: fit-content;
      padding: 14px 36px;
    }

    /* 通用区块 */
    section {
      padding: 100px 0;
    }
    .section-title {
      font-size: 2.8rem;
      font-weight: 700;
      margin-bottom: 20px;
      color: var(--text-primary);
      letter-spacing: -0.5px;
    }
    .section-subtitle {
      font-size: 1.1rem;
      color: var(--text-secondary);
      margin-bottom: 60px;
      max-width: 600px;
    }
    .highlight {
      color: var(--highlight-cyan);
    }

    /* 按钮 */
    .btn-primary {
      background: var(--gradient-cta);
      color: white;
      border: none;
      padding: 16px 38px;
      font-weight: 700;
      font-size: 1rem;
      border-radius: 4px;
      cursor: pointer;
      transition: all 0.25s;
      display: inline-block;
      text-decoration: none;
      letter-spacing: 0.5px;
    }
    .btn-primary:hover {
      transform: scale(1.03);
      box-shadow: 0 12px 28px rgba(255,60,0,0.45);
    }
    .btn-outline {
      background: transparent;
      border: 1px solid var(--highlight-cyan);
      color: var(--highlight-cyan);
      padding: 15px 36px;
      font-weight: 600;
      border-radius: 4px;
      cursor: pointer;
      transition: 0.2s;
      text-decoration: none;
    }
    .btn-outline:hover {
      background: rgba(0,240,255,0.08);
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
    }
    .hero-content {
      display: flex;
      align-items: center;
      gap: 60px;
      flex-wrap: wrap;
    }
    .hero-left {
      flex: 1 1 45%;
    }
    .hero-right {
      flex: 1 1 45%;
      position: relative;
      border-radius: 12px;
      overflow: hidden;
      clip-path: polygon(8% 0, 100% 0, 92% 100%, 0% 100%);
    }
    .hero-right img {
      width: 100%;
      height: auto;
      display: block;
      object-fit: cover;
      min-height: 380px;
    }
    .hero h1 {
      font-size: 3.8rem;
      font-weight: 900;
      line-height: 1.15;
      margin-bottom: 24px;
      color: var(--text-primary);
    }
    .hero p {
      font-size: 1.2rem;
      color: var(--text-secondary);
      margin-bottom: 36px;
      max-width: 500px;
    }
    .hero-buttons {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }

    /* 痛点卡片网格 */
    .pain-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 28px;
    }
    .pain-card {
      background: var(--card-bg);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      padding: 36px 28px;
      transition: all 0.3s ease;
    }
    .pain-card:hover {
      border-color: var(--highlight-cyan);
      transform: translateY(-6px);
      box-shadow: var(--shadow-glow);
    }
    .pain-icon {
      font-size: 2.2rem;
      margin-bottom: 18px;
    }

    /* 解决方案交替 */
    .solution-row {
      display: flex;
      align-items: center;
      gap: 50px;
      margin-bottom: 80px;
    }
    .solution-img {
      flex: 1 1 44%;
      clip-path: polygon(0 3%, 100% 0, 94% 97%, 6% 100%);
      overflow: hidden;
      border-radius: 8px;
    }
    .solution-img img {
      width: 100%;
      height: auto;
      display: block;
      object-fit: cover;
    }
    .solution-text {
      flex: 1 1 50%;
    }

    /* 优势数字卡片 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .stat-card {
      text-align: left;
      padding: 28px 0;
      border-bottom: 3px solid var(--highlight-cyan);
      transition: 0.3s;
    }
    .stat-number {
      font-family: var(--font-mono);
      font-size: 3.2rem;
      font-weight: 700;
      color: var(--highlight-cyan);
    }

    /* 案例网格 */
    .case-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .case-card {
      background: var(--card-bg);
      border-radius: var(--radius-sm);
      overflow: hidden;
      transition: 0.3s;
    }
    .case-img {
      height: 210px;
      overflow: hidden;
      position: relative;
    }
    .case-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    /* 证言 */
    .testimonial-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 16px;
    }
    .testimonial-card {
      background: var(--card-bg);
      border-left: 4px solid var(--accent-red);
      padding: 28px;
      min-width: 300px;
      border-radius: 8px;
    }

    /* FAQ */
    .faq-item {
      background: var(--card-bg);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      margin-bottom: 14px;
    }
    .faq-question {
      padding: 22px 28px;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    /* CTA 区块 */
    .cta-block {
      background: var(--primary);
      position: relative;
    }

    /* 页脚 */
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }

    @media (max-width: 1024px) {
      .stats-grid { grid-template-columns: repeat(2,1fr); }
      .case-grid { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .hero h1 { font-size: 2.5rem; }
      .hero-content { flex-direction: column; }
      .solution-row { flex-direction: column; }
      .stats-grid { grid-template-columns: 1fr; }
      .case-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
    }