/* roulang page: index */
:root {
      --deep-charcoal: #1E1E1E;
      --champion-orange: #F15A24;
      --warm-sand: #F9F6F0;
      --bronze-green: #2D5F5D;
      --white: #FFFFFF;
      --text-gray: #555555;
      --light-gray: #EAEAEA;
      --border-light: #E0E0E0;
      --shadow-card: 0 8px 30px rgba(0,0,0,0.06);
      --shadow-hover: 0 16px 40px rgba(0,0,0,0.12);
      --radius-card: 20px;
      --radius-button: 50px;
      --transition: all 0.3s ease;
    }

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

    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      background-color: var(--warm-sand);
      color: var(--deep-charcoal);
      line-height: 1.75;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

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

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

    button, .btn {
      cursor: pointer;
      font-family: inherit;
    }

    /* 导航 */
    .nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: var(--white);
      border-bottom: 1px solid var(--border-light);
      z-index: 1000;
      display: flex;
      align-items: center;
      padding: 0 24px;
      backdrop-filter: blur(8px);
      background: rgba(255,255,255,0.92);
    }

    .nav-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
    }

    .logo {
      font-size: 26px;
      font-weight: 800;
      color: var(--champion-orange);
      letter-spacing: 1px;
      display: flex;
      align-items: center;
    }
    .logo span {
      background: var(--champion-orange);
      color: white;
      border-radius: 30px;
      padding: 4px 14px;
      font-size: 20px;
      margin-left: 8px;
      font-weight: 700;
    }

    .nav-links {
      display: flex;
      gap: 36px;
      align-items: center;
    }

    .nav-links a {
      font-weight: 500;
      color: var(--deep-charcoal);
      position: relative;
      padding: 8px 0;
      transition: color 0.2s;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 3px;
      background: var(--champion-orange);
      border-radius: 2px;
      transition: width 0.25s;
    }

    .nav-links a:hover {
      color: var(--champion-orange);
    }
    .nav-links a:hover::after {
      width: 100%;
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: none;
      border: none;
      padding: 4px;
    }
    .hamburger span {
      width: 28px;
      height: 3px;
      background: var(--deep-charcoal);
      border-radius: 4px;
      transition: 0.3s;
    }

    .mobile-menu {
      display: none;
      position: fixed;
      top: 72px;
      left: 0;
      width: 100%;
      background: var(--deep-charcoal);
      flex-direction: column;
      padding: 32px 24px;
      gap: 24px;
      z-index: 999;
    }
    .mobile-menu a {
      color: white;
      font-size: 20px;
      font-weight: 600;
      border-bottom: 1px solid rgba(255,255,255,0.2);
      padding-bottom: 12px;
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: linear-gradient(135deg, #1E1E1E 0%, #F15A24 100%);
      position: relative;
      overflow: hidden;
      padding-top: 72px;
    }
    .hero::before {
      content: "";
      position: absolute;
      inset: 0;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.15;
      mix-blend-mode: overlay;
    }
    .hero-content {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
      position: relative;
      z-index: 2;
      gap: 40px;
    }
    .hero-left {
      flex: 1;
      color: white;
    }
    .hero-left h1 {
      font-size: 56px;
      font-weight: 800;
      line-height: 1.15;
      margin-bottom: 24px;
    }
    .hero-left .subtitle {
      font-size: 20px;
      margin-bottom: 40px;
      opacity: 0.9;
    }
    .btn-group {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--champion-orange);
      color: white;
      border: none;
      padding: 14px 36px;
      border-radius: var(--radius-button);
      font-weight: 600;
      font-size: 16px;
      transition: var(--transition);
      display: inline-block;
      text-align: center;
    }
    .btn-primary:hover {
      background: #D94A1A;
      transform: scale(1.03);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid white;
      color: white;
      padding: 14px 36px;
      border-radius: var(--radius-button);
      font-weight: 600;
      font-size: 16px;
      transition: var(--transition);
    }
    .btn-outline:hover {
      background: white;
      color: var(--champion-orange);
    }
    .hero-right {
      flex: 1;
      display: flex;
      justify-content: center;
    }
    .hero-img {
      width: 100%;
      max-width: 520px;
      border-radius: 32px;
      box-shadow: 0 25px 50px rgba(0,0,0,0.3);
      background: url('/assets/images/coverpic/cover-1.webp') center/cover no-repeat;
      aspect-ratio: 4/3;
    }

    /* 板块通用 */
    section {
      padding: 80px 0;
    }
    .section-title {
      font-size: 40px;
      font-weight: 700;
      color: var(--deep-charcoal);
      margin-bottom: 16px;
      text-align: center;
    }
    .section-desc {
      color: var(--text-gray);
      text-align: center;
      max-width: 700px;
      margin: 0 auto 48px;
    }

    /* 服务卡片 */
    .cards-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }
    .service-card {
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      text-align: center;
    }
    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .icon-circle {
      width: 80px;
      height: 80px;
      background: var(--champion-orange);
      border-radius: 50%;
      margin: 0 auto 20px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 36px;
      color: white;
    }
    .service-card h3 {
      font-size: 22px;
      font-weight: 600;
      margin-bottom: 12px;
    }

    /* 数据看板 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .stat-badge {
      background: white;
      border-radius: 16px;
      padding: 28px 16px;
      text-align: center;
      box-shadow: var(--shadow-card);
    }
    .stat-number {
      font-size: 38px;
      font-weight: 800;
      color: var(--champion-orange);
    }

    /* 案例卡片 */
    .case-row {
      display: flex;
      gap: 30px;
      flex-direction: column;
    }
    .case-item {
      display: flex;
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
    }
    .case-item:hover {
      transform: scale(1.01);
      box-shadow: var(--shadow-hover);
    }
    .case-img {
      width: 40%;
      background-size: cover;
      background-position: center;
      min-height: 240px;
    }
    .case-text {
      padding: 32px;
      flex: 1;
    }
    .tag {
      background: var(--champion-orange);
      color: white;
      padding: 4px 14px;
      border-radius: 20px;
      font-size: 14px;
      display: inline-block;
      margin-bottom: 12px;
    }

    /* 流程 */
    .steps {
      display: flex;
      justify-content: space-between;
      text-align: center;
    }
    .step {
      flex: 1;
      position: relative;
    }
    .step-circle {
      width: 70px;
      height: 70px;
      background: var(--bronze-green);
      border-radius: 50%;
      margin: 0 auto 16px;
      color: white;
      font-weight: 700;
      font-size: 28px;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    /* FAQ */
    .faq-item {
      background: white;
      border-radius: 12px;
      margin-bottom: 12px;
      padding: 20px;
      cursor: pointer;
      box-shadow: 0 4px 12px rgba(0,0,0,0.04);
    }
    .faq-question {
      font-weight: 600;
      display: flex;
      justify-content: space-between;
    }

    /* CTA */
    .cta-band {
      background: linear-gradient(135deg, #1E1E1E, #F15A24);
      border-radius: 32px;
      padding: 64px 32px;
      text-align: center;
      color: white;
      margin: 0 24px;
    }

    /* 页脚 */
    .footer {
      background: var(--deep-charcoal);
      color: #ccc;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
    }
    .footer a:hover {
      color: var(--champion-orange);
    }

    @media (max-width: 1024px) {
      .hero-left h1 { font-size: 42px; }
      .cards-grid { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .hero-content { flex-direction: column; text-align: center; }
      .hero-left h1 { font-size: 36px; }
      .cards-grid, .stats-grid { grid-template-columns: 1fr; }
      .case-item { flex-direction: column; }
      .case-img { width: 100%; height: 200px; }
      .steps { flex-direction: column; gap: 24px; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 520px) {
      .btn-group { flex-direction: column; align-items: center; }
      .footer-grid { grid-template-columns: 1fr; }
    }