/* roulang page: index */
:root {
      --deep-charcoal: #1E1E24;
      --purple-start: #7B2FBE;
      --purple-mid: #9333EA;
      --purple-end: #A855F7;
      --amber-gold: #F59E0B;
      --light-bg: #FAFAFA;
      --warm-grey: #F5F4F0;
      --text-primary: #1A1A1A;
      --text-secondary: #555555;
      --text-light: #E0E0E0;
      --white: #FFFFFF;
      --border-light: #e5e7eb;
      --shadow-sm: 0 8px 20px rgba(0,0,0,0.04);
      --shadow-md: 0 12px 28px rgba(0,0,0,0.08);
      --shadow-lg: 0 20px 40px rgba(0,0,0,0.12);
      --radius-card: 16px;
      --radius-btn: 8px;
      --radius-full: 50px;
      --transition: all 0.25s ease;
      --font-title: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      --font-body: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      --container-max: 1280px;
      --section-gap: 120px;
    }

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

    body {
      font-family: var(--font-body);
      font-weight: 400;
      font-size: 16px;
      line-height: 1.8;
      color: var(--text-primary);
      background-color: var(--light-bg);
      -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;
      background: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      font-weight: 600;
      transition: var(--transition);
    }

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

    /* ----- 导航栏 ----- */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(30, 30, 36, 0.85);
      backdrop-filter: blur(14px);
      -webkit-backdrop-filter: blur(14px);
      border-bottom: 1px solid rgba(168,85,247,0.25);
      transition: background 0.3s ease;
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 32px;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-family: var(--font-title);
      font-weight: 800;
      font-size: 1.8rem;
      letter-spacing: 1px;
      background: linear-gradient(135deg, #A855F7 0%, #C084FC 70%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .logo i {
      font-size: 2rem;
      background: linear-gradient(135deg, #F59E0B, #FBBF24);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .nav-links {
      display: flex;
      gap: 36px;
      align-items: center;
      list-style: none;
    }

    .nav-links a {
      font-weight: 500;
      color: var(--text-light);
      position: relative;
      padding: 6px 0;
      font-size: 1rem;
      letter-spacing: 0.3px;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--amber-gold);
      transition: width 0.25s ease;
    }
    .nav-links a:hover {
      color: var(--amber-gold);
    }
    .nav-links a:hover::after {
      width: 100%;
    }

    .btn-nav-cta {
      background: var(--amber-gold);
      color: #1E1E24;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      box-shadow: 0 4px 12px rgba(245,158,11,0.3);
    }
    .btn-nav-cta:hover {
      background: #FBBF24;
      transform: translateY(-2px);
      box-shadow: 0 8px 18px rgba(245,158,11,0.45);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 7px;
      cursor: pointer;
      background: transparent;
      border: none;
    }
    .hamburger span {
      width: 28px;
      height: 2px;
      background: #E0E0E0;
      border-radius: 3px;
      transition: var(--transition);
    }

    @media (max-width: 1024px) {
      .nav-links {
        gap: 20px;
      }
    }
    @media (max-width: 768px) {
      .nav-links {
        position: fixed;
        top: 72px;
        left: 0;
        width: 100%;
        background: rgba(30,30,36,0.96);
        backdrop-filter: blur(20px);
        flex-direction: column;
        align-items: flex-start;
        padding: 40px 32px;
        gap: 32px;
        display: none;
        border-bottom: 1px solid rgba(168,85,247,0.3);
      }
      .nav-links.active {
        display: flex;
      }
      .hamburger {
        display: flex;
      }
    }

    /* 基础区块 */
    section {
      padding: var(--section-gap) 0;
    }

    .section-title {
      font-family: var(--font-title);
      font-size: 2.8rem;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 18px;
      color: var(--text-primary);
    }
    .section-sub {
      font-size: 1.2rem;
      color: var(--text-secondary);
      max-width: 680px;
    }

    /* Hero */
    .hero {
      padding-top: 160px;
      padding-bottom: 120px;
      background: radial-gradient(circle at 30% 40%, #2a2035 0%, #1E1E24 80%);
      position: relative;
      overflow: hidden;
      display: flex;
      align-items: center;
      min-height: 90vh;
    }
    .hero::before {
      content: "";
      position: absolute;
      width: 500px;
      height: 500px;
      background: radial-gradient(circle, rgba(147,51,234,0.45) 0%, transparent 70%);
      top: 10%;
      right: -5%;
      border-radius: 50%;
      filter: blur(70px);
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
      position: relative;
      z-index: 2;
    }
    .hero-content h1 {
      font-family: var(--font-title);
      font-size: 4rem;
      font-weight: 800;
      line-height: 1.15;
      color: white;
      margin-bottom: 24px;
    }
    .hero-content h1 span {
      background: linear-gradient(to right, #A855F7, #F59E0B);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-content p {
      font-size: 1.25rem;
      color: #D1D5DB;
      margin-bottom: 36px;
      max-width: 500px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: linear-gradient(135deg, #7B2FBE, #A855F7);
      color: white;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      box-shadow: 0 8px 22px rgba(124,58,237,0.45);
    }
    .btn-primary:hover {
      transform: scale(1.02);
      box-shadow: 0 14px 28px rgba(147,51,234,0.6);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid #F59E0B;
      color: #F59E0B;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
    }
    .btn-outline:hover {
      background: #F59E0B;
      color: #1E1E24;
    }
    .hero-image {
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      border-radius: 28px;
      height: 420px;
      box-shadow: 0 25px 35px rgba(0,0,0,0.5);
      position: relative;
      overflow: hidden;
    }
    .hero-image::after {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(123,47,190,0.3), rgba(245,158,11,0.2));
    }

    @media (max-width: 768px) {
      .hero-grid {
        grid-template-columns: 1fr;
      }
      .hero-content h1 {
        font-size: 2.8rem;
      }
    }

    /* 服务卡片 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
      margin-top: 48px;
    }
    .service-card {
      background: white;
      padding: 36px 28px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      border: 1px solid transparent;
    }
    .service-card:hover {
      transform: translateY(-8px);
      box-shadow: var(--shadow-lg);
      border-color: #A855F7;
    }
    .service-card i {
      font-size: 2.8rem;
      color: #7B2FBE;
      margin-bottom: 20px;
    }
    .service-card h3 {
      font-family: var(--font-title);
      font-weight: 700;
      font-size: 1.6rem;
      margin-bottom: 14px;
    }

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

    /* 优势数据 */
    .stats-section {
      background: var(--deep-charcoal);
      color: white;
    }
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 32px;
      text-align: center;
    }
    .stat-item {
      font-size: 3.2rem;
      font-weight: 800;
      color: #F59E0B;
      font-family: var(--font-title);
    }
    .stat-label {
      font-size: 1rem;
      color: #D1D5DB;
      margin-top: 8px;
    }

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

    /* 案例墙 */
    .case-logos {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 40px;
      margin-top: 50px;
      filter: grayscale(0.9);
      opacity: 0.8;
    }
    .case-logos img {
      height: 50px;
      transition: var(--transition);
    }
    .case-logos img:hover {
      filter: grayscale(0);
      opacity: 1;
    }

    /* 解决方案流程 */
    .steps {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 36px;
      margin-top: 50px;
    }
    .step-card {
      background: white;
      padding: 36px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
    }
    .step-num {
      font-size: 3rem;
      font-weight: 800;
      background: linear-gradient(135deg, #7B2FBE, #A855F7);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

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

    /* FAQ */
    .faq-item {
      background: white;
      border-radius: 16px;
      padding: 20px 28px;
      margin-bottom: 12px;
      box-shadow: var(--shadow-sm);
      cursor: pointer;
      border-left: 4px solid transparent;
      transition: var(--transition);
    }
    .faq-item:hover {
      border-left-color: #A855F7;
    }
    .faq-question {
      font-weight: 700;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    /* CTA */
    .global-cta {
      background: linear-gradient(135deg, #2e1a48, #1E1E24);
      text-align: center;
      color: white;
    }
    .btn-gold {
      background: #F59E0B;
      color: #1E1E24;
      padding: 18px 48px;
      border-radius: var(--radius-btn);
      font-weight: 800;
    }

    footer {
      background: #111114;
      color: #A1A1AA;
      padding: 60px 0 30px;
    }

    @media (max-width: 768px) {
      .section-title { font-size: 2.2rem; }
    }

    button:focus-visible, a:focus-visible {
      outline: 2px solid #A855F7;
      outline-offset: 3px;
    }