/* roulang page: index */
:root {
      --primary: #E8453A;
      --primary-dark: #C0392B;
      --secondary: #1A1A2E;
      --accent: #F0A500;
      --accent-hover: #e09500;
      --background: #F9F9FB;
      --white: #FFFFFF;
      --text-primary: #1A1A2E;
      --text-secondary: #5A5A6E;
      --border: #E6E6EC;
      --card-bg: #FFFFFF;
      --radius-card: 16px;
      --radius-btn: 10px;
      --radius-sm: 8px;
      --radius-xl: 24px;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.04), 0 1px 4px rgba(0,0,0,0.06);
      --shadow-hover: 0 12px 32px rgba(0,0,0,0.08);
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --font-mono: "DIN Alternate", "Oswald", "SF Mono", "Courier New", monospace;
      --transition: 0.25s ease;
    }

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

    body {
      font-family: var(--font-sans);
      background: var(--background);
      color: var(--text-primary);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

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

    a {
      text-decoration: none;
      color: inherit;
    }

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      outline: none;
      transition: var(--transition);
    }

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

    /* 导航 */
    .nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(255,255,255,0.85);
      backdrop-filter: blur(12px);
      box-shadow: 0 2px 20px rgba(0,0,0,0.04);
      z-index: 1000;
      transition: var(--transition);
    }

    .nav.scrolled {
      background: rgba(255,255,255,1);
      box-shadow: 0 4px 24px rgba(0,0,0,0.06);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }

    .logo {
      font-size: 24px;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: 0.5px;
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .logo span {
      color: var(--secondary);
      font-weight: 600;
    }

    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }

    .nav-links a {
      font-weight: 500;
      font-size: 15px;
      color: var(--text-primary);
      position: relative;
      padding: 8px 0;
      transition: var(--transition);
    }

    .nav-links a:hover {
      color: var(--primary);
    }

    .nav-cta {
      background: var(--primary);
      color: var(--white);
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 15px;
      transition: var(--transition);
      box-shadow: 0 4px 12px rgba(232,69,58,0.25);
    }

    .nav-cta:hover {
      background: var(--primary-dark);
      transform: translateY(-1px);
      box-shadow: 0 8px 18px rgba(232,69,58,0.35);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: transparent;
      border: none;
    }

    .hamburger span {
      width: 28px;
      height: 3px;
      background: var(--secondary);
      border-radius: 4px;
      transition: var(--transition);
    }

    .mobile-menu {
      display: none;
      position: absolute;
      top: 72px;
      left: 0;
      width: 100%;
      background: var(--white);
      box-shadow: 0 24px 40px rgba(0,0,0,0.08);
      flex-direction: column;
      padding: 24px;
      gap: 20px;
      border-radius: 0 0 24px 24px;
      opacity: 0;
      transform: translateY(-10px);
      transition: var(--transition);
    }

    .mobile-menu.active {
      display: flex;
      opacity: 1;
      transform: translateY(0);
    }

    .mobile-menu a {
      font-size: 18px;
      font-weight: 600;
      padding: 12px 0;
      border-bottom: 1px solid var(--border);
    }

    /* 区块通用 */
    section {
      padding: 100px 0;
    }

    @media (max-width: 1024px) {
      section {
        padding: 80px 0;
      }
    }

    @media (max-width: 768px) {
      section {
        padding: 64px 0;
      }
      .nav-links {
        display: none;
      }
      .hamburger {
        display: flex;
      }
    }

    /* Hero */
    .hero {
      padding-top: 160px;
      padding-bottom: 120px;
      background: var(--background);
      position: relative;
      overflow: hidden;
    }

    .hero::before {
      content: "";
      position: absolute;
      right: -10%;
      top: -20%;
      width: 700px;
      height: 700px;
      background: radial-gradient(circle, rgba(232,69,58,0.08) 0%, transparent 70%);
      border-radius: 50%;
      z-index: 0;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1.1fr 1fr;
      gap: 60px;
      align-items: center;
      position: relative;
      z-index: 2;
    }

    .hero-text h1 {
      font-size: 56px;
      line-height: 1.15;
      font-weight: 700;
      letter-spacing: -0.5px;
      color: var(--secondary);
    }

    .hero-text .highlight {
      color: var(--primary);
    }

    .hero-sub {
      font-size: 18px;
      color: var(--text-secondary);
      margin: 24px 0 32px;
      max-width: 500px;
    }

    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: var(--primary);
      color: var(--white);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      box-shadow: 0 6px 18px rgba(232,69,58,0.2);
    }

    .btn-primary:hover {
      background: var(--primary-dark);
      transform: translateY(-2px);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
    }

    .btn-outline:hover {
      background: rgba(232,69,58,0.08);
    }

    .hero-image {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: var(--radius-xl);
      height: 420px;
      box-shadow: var(--shadow-sm);
      transform: rotate(1deg);
      transition: transform 0.3s;
    }

    @media (max-width: 1024px) {
      .hero-grid {
        grid-template-columns: 1fr;
        gap: 40px;
      }
      .hero-text h1 {
        font-size: 40px;
      }
      .hero-image {
        height: 320px;
      }
    }

    /* 功能 */
    .features {
      background: var(--white);
    }

    .section-title h2 {
      font-size: 36px;
      font-weight: 700;
      margin-bottom: 16px;
      color: var(--secondary);
    }

    .features-grid {
      display: grid;
      grid-template-columns: 1.2fr 0.8fr;
      gap: 24px;
      margin-top: 48px;
    }

    .feature-main {
      background: #fef1f0;
      border-radius: var(--radius-card);
      padding: 40px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      box-shadow: var(--shadow-sm);
    }

    .feature-badge {
      display: inline-block;
      background: var(--primary);
      color: white;
      border-radius: 20px;
      padding: 4px 16px;
      font-size: 13px;
      font-weight: 600;
      margin-bottom: 16px;
    }

    .feature-main h3 {
      font-size: 28px;
      margin: 16px 0;
    }

    .stat-big {
      font-family: var(--font-mono);
      font-size: 64px;
      font-weight: 700;
      color: var(--primary);
    }

    .feature-side {
      display: flex;
      flex-direction: column;
      gap: 24px;
    }

    .feature-card {
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }

    @media (max-width: 768px) {
      .features-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 场景 */
    .scenarios {
      background: var(--background);
    }

    .scenario-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 48px;
    }

    .scenario-card {
      background: var(--white);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

    .scenario-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }

    .scenario-img {
      height: 200px;
      background-size: cover;
      background-position: center;
      transition: transform 0.3s;
    }

    .scenario-card:hover .scenario-img {
      transform: scale(1.04);
    }

    .scenario-content {
      padding: 24px;
    }

    @media (max-width: 1024px) {
      .scenario-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 520px) {
      .scenario-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 案例 */
    .cases {
      background: var(--white);
    }

    .cases-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding: 24px 0 40px;
      scroll-snap-type: x mandatory;
    }

    .case-card {
      min-width: 320px;
      background: var(--secondary);
      border-radius: var(--radius-card);
      padding: 32px;
      color: white;
      scroll-snap-align: start;
      background-image: url('/assets/images/coverpic/cover-2.webp');
      background-size: cover;
      background-blend-mode: overlay;
      position: relative;
    }

    .case-number {
      font-family: var(--font-mono);
      font-size: 56px;
      font-weight: 700;
      color: var(--accent);
    }

    /* 价格 */
    .pricing-grid {
      display: flex;
      gap: 24px;
      justify-content: center;
      flex-wrap: wrap;
      margin-top: 48px;
    }

    .pricing-card {
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 36px;
      flex: 1;
      min-width: 260px;
      border: 1px solid var(--border);
      box-shadow: var(--shadow-sm);
    }

    .pricing-card.featured {
      border: 2px solid var(--primary);
      position: relative;
    }

    .popular-tag {
      background: var(--primary);
      color: white;
      border-radius: 20px;
      padding: 4px 16px;
      font-size: 13px;
      font-weight: 600;
      position: absolute;
      top: -12px;
      right: 24px;
    }

    .price {
      font-family: var(--font-mono);
      font-size: 48px;
      color: var(--secondary);
    }

    /* FAQ */
    .faq-item {
      background: var(--white);
      border-radius: var(--radius-sm);
      margin-bottom: 12px;
      box-shadow: var(--shadow-sm);
    }

    .faq-question {
      padding: 20px;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
    }

    .faq-answer {
      padding: 0 20px 20px;
      color: var(--text-secondary);
      display: none;
    }

    .faq-item.active .faq-answer {
      display: block;
    }

    /* CTA */
    .cta-dark {
      background: var(--secondary);
      color: white;
      text-align: center;
      padding: 100px 0;
    }

    .btn-accent {
      background: var(--accent);
      color: var(--secondary);
      font-weight: 700;
      padding: 16px 40px;
      border-radius: var(--radius-btn);
      font-size: 18px;
    }

    .footer {
      background: #0f0f1a;
      color: #ccc;
      padding: 60px 0 30px;
    }