/* roulang page: index */
:root {
      --primary: #F15A24;
      --primary-hover: #E04A1A;
      --primary-light: rgba(241, 90, 36, 0.1);
      --secondary: #1E1E1E;
      --accent: #00C2BA;
      --accent-light: rgba(0, 194, 186, 0.15);
      --bg: #FDF8F3;
      --bg-card: #FFFFFF;
      --bg-alt: #F4F4F6;
      --text-main: #1E1E1E;
      --text-muted: #5A5A5A;
      --white: #FFFFFF;
      --border-light: rgba(0,0,0,0.06);
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-hover: 0 14px 32px rgba(241, 90, 36, 0.12);
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-btn: 8px;
      --font-heading: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
      --font-body: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
      --font-data: 'DIN Alternate', 'Bebas Neue', 'Oswald', 'Impact', sans-serif;
      --max-width: 1240px;
      --header-height: 72px;
    }

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

    body {
      font-family: var(--font-body);
      background-color: var(--bg);
      color: var(--text-main);
      line-height: 1.6;
      font-size: 16px;
      overflow-x: hidden;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s ease;
    }

    button, input, textarea {
      font-family: inherit;
      border: none;
      outline: none;
      background: transparent;
    }

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

    /* 导航 */
    #header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(255, 255, 255, 0.96);
      backdrop-filter: blur(8px);
      height: var(--header-height);
      display: flex;
      align-items: center;
      box-shadow: 0 1px 0 rgba(0,0,0,0.04);
      transition: box-shadow 0.2s;
    }
    #header.scrolled {
      box-shadow: 0 6px 18px rgba(0,0,0,0.06);
    }
    .header-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    .logo {
      font-family: var(--font-heading);
      font-weight: 800;
      font-size: 1.8rem;
      color: var(--secondary);
      letter-spacing: -0.5px;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo span {
      color: var(--primary);
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .nav-links a {
      font-weight: 500;
      font-size: 0.95rem;
      color: var(--text-main);
      position: relative;
      padding: 6px 0;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width 0.2s ease;
    }
    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }
    .btn-nav {
      background: var(--primary);
      color: white !important;
      padding: 10px 22px !important;
      border-radius: var(--radius-btn);
      font-weight: 600;
      margin-left: 12px;
      transition: background 0.2s, transform 0.1s;
      background: linear-gradient(135deg, #F15A24 0%, #FF7B4A 100%);
    }
    .btn-nav:hover {
      background: linear-gradient(135deg, #E04A1A 0%, #F15A24 100%);
      transform: translateY(-1px);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
    }
    .hamburger span {
      width: 26px;
      height: 2.5px;
      background: var(--secondary);
      border-radius: 2px;
    }

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

    .section-title {
      font-family: var(--font-heading);
      font-weight: 700;
      font-size: 2.2rem;
      color: var(--secondary);
      margin-bottom: 16px;
      letter-spacing: -0.3px;
    }
    .section-sub {
      font-size: 1.1rem;
      color: var(--text-muted);
      margin-bottom: 48px;
      max-width: 600px;
    }

    /* 按钮 */
    .btn-primary {
      background: linear-gradient(135deg, #F15A24 0%, #FF7B4A 100%);
      color: white;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 1rem;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: all 0.25s ease;
      box-shadow: 0 8px 18px rgba(241,90,36,0.25);
    }
    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 14px 28px rgba(241,90,36,0.35);
    }
    .btn-outline {
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 12px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      background: transparent;
      transition: all 0.2s;
    }
    .btn-outline:hover {
      background: var(--primary-light);
    }

    /* Hero */
    #hero {
      position: relative;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 85vh;
      display: flex;
      align-items: center;
      color: white;
    }
    .hero-overlay {
      position: absolute;
      inset: 0;
      background: linear-gradient(90deg, rgba(30,30,30,0.75) 0%, rgba(30,30,30,0.2) 100%);
    }
    .hero-content {
      position: relative;
      z-index: 2;
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      gap: 40px;
    }
    .hero-text {
      flex: 1;
      max-width: 600px;
    }
    .hero-text h1 {
      font-family: var(--font-heading);
      font-weight: 800;
      font-size: 3.4rem;
      line-height: 1.2;
      margin-bottom: 20px;
    }
    .hero-text p {
      font-size: 1.2rem;
      margin-bottom: 36px;
      opacity: 0.9;
    }
    .hero-badges {
      display: flex;
      gap: 24px;
      flex-wrap: wrap;
    }
    .badge-float {
      background: rgba(255,255,255,0.12);
      backdrop-filter: blur(12px);
      padding: 16px 24px;
      border-radius: var(--radius-md);
      color: white;
      font-weight: 600;
    }

    /* 服务卡片 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .service-card {
      background: var(--bg-card);
      padding: 36px 28px;
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-sm);
      transition: all 0.25s;
    }
    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .icon-circle {
      width: 56px;
      height: 56px;
      background: var(--accent-light);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
    }

    /* 优势 */
    .advantages-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }
    .data-wall {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
    }
    .data-badge {
      background: var(--bg-card);
      padding: 24px;
      border-radius: var(--radius-md);
      text-align: center;
      box-shadow: var(--shadow-sm);
    }
    .data-num {
      font-family: var(--font-data);
      font-size: 2.6rem;
      color: var(--primary);
    }

    /* 案例卡片 */
    .cases-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
    }
    .case-card img {
      border-radius: var(--radius-md) var(--radius-md) 0 0;
      aspect-ratio: 16/9;
      object-fit: cover;
    }

    /* 方案图文 */
    .solution-row {
      display: flex;
      gap: 56px;
      align-items: center;
      margin-bottom: 80px;
    }
    .solution-row.reverse {
      flex-direction: row-reverse;
    }

    /* FAQ */
    .faq-item {
      background: var(--bg-alt);
      border-radius: var(--radius-btn);
      margin-bottom: 12px;
      overflow: hidden;
    }
    .faq-question {
      padding: 20px 24px;
      font-weight: 700;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
    }
    .faq-answer {
      padding: 0 24px 20px;
      color: var(--text-muted);
      display: none;
    }
    .faq-item.active .faq-answer {
      display: block;
    }

    /* 联系表单 */
    .contact-wrapper {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
    }
    input, textarea {
      width: 100%;
      padding: 14px 0;
      border-bottom: 2px solid #ddd;
      margin-bottom: 20px;
      font-size: 1rem;
      background: transparent;
    }
    input:focus, textarea:focus {
      border-bottom: 3px solid var(--primary);
    }

    footer {
      background: var(--secondary);
      color: var(--bg);
      padding: 48px 0;
    }

    @media (max-width: 1024px) {
      .grid-3 { grid-template-columns: repeat(2,1fr); }
      .advantages-grid { grid-template-columns: 1fr; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .hero-content { flex-direction: column; }
      .grid-3, .cases-grid, .contact-wrapper { grid-template-columns: 1fr; }
      .solution-row { flex-direction: column; }
    }