/* roulang page: index */
:root {
      --primary-red: #E12B2B;
      --primary-red-hover: #C71E1E;
      --deep-charcoal: #1E1E1E;
      --amber-gold: #F5A623;
      --warm-bg: #FAF8F5;
      --card-white: #FFFFFF;
      --text-graphite: #3A3A3A;
      --text-mist: #8C8C8C;
      --trust-green: #0EAD69;
      --border-light: rgba(0,0,0,0.04);
      --shadow-card: 0 2px 12px rgba(0,0,0,0.04);
      --shadow-card-hover: 0 8px 28px rgba(0,0,0,0.08);
      --shadow-nav: 0 1px 0 rgba(0,0,0,0.05);
      --radius-card: 16px;
      --radius-btn: 8px;
      --radius-pill: 50px;
      --radius-img: 12px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      --font-number: "Inter", "DIN Alternate", sans-serif;
      --transition: all 0.3s ease;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--warm-bg);
      color: var(--text-graphite);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }
    h1, h2, h3 {
      font-weight: 700;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    img {
      max-width: 100%;
      display: block;
      height: auto;
    }
    button, .btn {
      cursor: pointer;
      border: none;
      font-family: inherit;
      font-weight: 600;
      transition: var(--transition);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      white-space: nowrap;
    }

    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: var(--card-white);
      box-shadow: var(--shadow-nav), 0 4px 10px rgba(0,0,0,0.02);
      z-index: 100;
      display: flex;
      align-items: center;
    }
    .header-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    .logo-area {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 24px;
      font-weight: 700;
      color: var(--primary-red);
      letter-spacing: 1px;
    }
    .logo-area i {
      font-size: 22px;
      color: var(--primary-red);
    }
    .nav-links {
      display: flex;
      gap: 10px;
      align-items: center;
    }
    .nav-capsule {
      padding: 8px 18px;
      border-radius: var(--radius-pill);
      background: rgba(0,0,0,0.02);
      color: var(--deep-charcoal);
      font-weight: 500;
      transition: var(--transition);
      font-size: 15px;
    }
    .nav-capsule:hover {
      background: var(--primary-red);
      color: white;
    }
    .mobile-menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 26px;
      color: var(--deep-charcoal);
    }
    .mobile-nav-drawer {
      display: none;
    }

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

    /* Hero */
    .hero-section {
      padding: 140px 0 100px;
      background: radial-gradient(circle at 20% 30%, rgba(225,43,43,0.06) 0%, var(--warm-bg) 70%);
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 50px;
    }
    .hero-text {
      flex: 1;
    }
    .hero-text h1 {
      font-size: 42px;
      font-weight: 700;
      letter-spacing: -0.5px;
      color: var(--deep-charcoal);
      margin-bottom: 20px;
      line-height: 1.3;
    }
    .hero-text .subtitle {
      font-size: 18px;
      color: var(--text-graphite);
      margin-bottom: 32px;
      line-height: 1.7;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--primary-red);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-size: 16px;
    }
    .btn-primary:hover {
      background: var(--primary-red-hover);
    }
    .btn-outline {
      background: transparent;
      border: 1px solid var(--deep-charcoal);
      color: var(--deep-charcoal);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-size: 16px;
    }
    .btn-outline:hover {
      background: var(--deep-charcoal);
      color: white;
    }
    .hero-image {
      flex: 1;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: var(--radius-card);
      height: 380px;
      box-shadow: var(--shadow-card-hover);
      transform: rotate(1deg);
      position: relative;
    }

    /* 核心服务 */
    .section-title {
      font-size: 32px;
      font-weight: 700;
      margin-bottom: 16px;
      color: var(--deep-charcoal);
    }
    .section-sub {
      color: var(--text-mist);
      margin-bottom: 48px;
      font-size: 17px;
    }
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .service-card {
      background: var(--card-white);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      border-top: 3px solid transparent;
    }
    .service-card:hover {
      border-top-color: var(--primary-red);
      transform: translateY(-4px);
      box-shadow: var(--shadow-card-hover);
    }
    .service-icon {
      font-size: 32px;
      color: var(--primary-red);
      margin-bottom: 20px;
    }
    .service-card h3 {
      font-size: 20px;
      margin-bottom: 12px;
    }

    /* 数据徽章 */
    .badge-wall {
      background: #F3F0EB;
      border-radius: var(--radius-card);
      padding: 48px 32px;
    }
    .badge-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      text-align: center;
      gap: 30px;
    }
    .badge-number {
      font-family: var(--font-number);
      font-size: 48px;
      font-weight: 700;
      color: var(--amber-gold);
      line-height: 1.2;
    }
    .badge-label {
      color: var(--text-mist);
      font-size: 14px;
      margin-top: 8px;
    }

    /* 技术优势交替 */
    .advantage-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 80px;
    }
    .advantage-row.reverse {
      flex-direction: row-reverse;
    }
    .adv-text {
      flex: 1;
    }
    .adv-image {
      flex: 1;
      background-size: cover;
      background-position: center;
      border-radius: var(--radius-img);
      height: 300px;
      box-shadow: var(--shadow-card);
    }
    .adv-list {
      list-style: none;
      margin-top: 24px;
    }
    .adv-list li {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 14px;
      font-size: 16px;
    }
    .adv-list i {
      color: var(--primary-red);
      font-size: 8px;
    }

    /* 案例卡片 */
    .cases-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 20px;
      scrollbar-width: thin;
    }
    .case-card {
      min-width: 280px;
      background: var(--card-white);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      flex-shrink: 0;
    }
    .case-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-card-hover);
    }
    .case-img {
      height: 180px;
      background-size: cover;
      background-position: center;
    }
    .case-info {
      padding: 16px;
    }
    .case-tag {
      background: var(--amber-gold);
      color: white;
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 12px;
    }

    /* 流程 */
    .steps-line {
      display: flex;
      justify-content: space-between;
      align-items: center;
      position: relative;
    }
    .step-item {
      text-align: center;
      flex: 1;
      position: relative;
    }
    .step-circle {
      width: 60px;
      height: 60px;
      background: var(--primary-red);
      color: white;
      border-radius: 50%;
      font-weight: 700;
      font-size: 24px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 16px;
    }

    /* FAQ */
    .faq-item {
      background: var(--card-white);
      border-radius: var(--radius-card);
      margin-bottom: 16px;
      box-shadow: var(--shadow-card);
    }
    .faq-question {
      padding: 20px;
      font-weight: 600;
      display: flex;
      align-items: center;
      gap: 12px;
      cursor: pointer;
      background: #F9F7F4;
      border-radius: var(--radius-card);
    }
    .faq-answer {
      padding: 0 20px 20px;
      color: var(--text-graphite);
    }

    /* CTA */
    .cta-full {
      background: var(--primary-red);
      padding: 80px 20px;
      text-align: center;
      color: white;
      border-radius: 0;
    }
    .btn-white {
      background: white;
      color: var(--primary-red);
      padding: 16px 40px;
      border-radius: var(--radius-btn);
      font-weight: 700;
    }

    /* 页脚 */
    .site-footer {
      background: var(--deep-charcoal);
      color: #ccc;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 30px;
    }

    @media (max-width: 1024px) {
      .hero-grid, .advantage-row {
        flex-direction: column;
      }
      .services-grid { grid-template-columns: repeat(2,1fr); }
      .badge-grid { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .mobile-menu-toggle { display: block; }
      .services-grid, .badge-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .steps-line { flex-direction: column; gap: 30px; }
    }
    @media (max-width: 520px) {
      .footer-grid { grid-template-columns: 1fr; }
      .hero-buttons { flex-direction: column; }
    }