/* roulang page: index */
:root {
      --color-primary: #E43D30;
      --color-secondary: #1A1A2E;
      --color-accent: #FFB800;
      --color-bg: #F5F5F0;
      --color-text: #1A1A2E;
      --color-text-light: #5A5A6E;
      --color-white: #FFFFFF;
      --color-border: #e0e0da;
      --font-heading: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      --font-body: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      --font-number: "Inter", "DIN Alternate", "Roboto", sans-serif;
      --radius-card: 12px;
      --radius-btn: 6px;
      --radius-large: 16px;
      --shadow-card: 0 4px 20px rgba(26,26,46,0.08);
      --shadow-hover: 0 8px 30px rgba(228,61,48,0.15);
      --transition: 0.3s ease;
      --max-width: 1200px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-body);
      background-color: var(--color-bg);
      color: var(--color-text);
      line-height: 1.75;
      overflow-x: hidden;
    }
    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 20px;
    }
    /* 导航 */
    .main-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      transition: background 0.3s, backdrop-filter 0.3s, box-shadow 0.3s;
      background: transparent;
      backdrop-filter: blur(0px);
    }
    .main-header.scrolled {
      background: rgba(26, 26, 46, 0.92);
      backdrop-filter: blur(12px);
      box-shadow: 0 8px 24px rgba(0,0,0,0.2);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 16px 20px;
      max-width: var(--max-width);
      margin: 0 auto;
    }
    .logo {
      font-size: 1.8rem;
      font-weight: 800;
      letter-spacing: -0.5px;
      color: var(--color-white);
      text-decoration: none;
      display: flex;
      align-items: center;
      gap: 6px;
      transition: color 0.3s;
    }
    .logo-icon {
      font-size: 2rem;
      line-height: 1;
    }
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-link {
      color: rgba(255,255,255,0.9);
      text-decoration: none;
      font-weight: 500;
      font-size: 1rem;
      transition: color 0.2s;
      position: relative;
    }
    .nav-link:hover {
      color: var(--color-accent);
    }
    .btn-primary {
      background: var(--color-primary);
      color: white;
      border: none;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      text-decoration: none;
      display: inline-block;
      transition: background 0.2s, transform 0.2s;
      box-shadow: 0 4px 12px rgba(228,61,48,0.3);
      cursor: pointer;
      font-family: var(--font-body);
    }
    .btn-primary:hover {
      background: #C53030;
      transform: translateY(-2px);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: transparent;
      border: none;
    }
    .hamburger span {
      width: 26px;
      height: 3px;
      background: white;
      border-radius: 2px;
      transition: 0.3s;
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: var(--color-secondary);
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 32px;
      z-index: 999;
    }
    .mobile-menu.active {
      display: flex;
    }
    .close-menu {
      position: absolute;
      top: 20px;
      right: 20px;
      font-size: 2rem;
      background: none;
      border: none;
      color: white;
      cursor: pointer;
    }

    /* Hero */
    .hero {
      background: linear-gradient(135deg, #1A1A2E 0%, #0f0f1a 100%);
      min-height: 100vh;
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
      color: white;
      padding: 120px 0 100px;
    }
    .hero-bg-decor {
      position: absolute;
      top: -20%;
      right: -5%;
      width: 500px;
      height: 600px;
      background: radial-gradient(circle, rgba(228,61,48,0.25) 0%, transparent 70%);
      filter: blur(60px);
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 40px;
      position: relative;
      z-index: 2;
      flex-wrap: wrap;
    }
    .hero-content {
      flex: 1 1 500px;
    }
    .hero h1 {
      font-family: var(--font-heading);
      font-size: 3.8rem;
      font-weight: 800;
      line-height: 1.2;
      letter-spacing: -0.5px;
      color: white;
      margin-bottom: 20px;
      text-shadow: 0 4px 12px rgba(0,0,0,0.4);
    }
    .hero-subtitle {
      font-size: 1.25rem;
      color: rgba(255,255,255,0.8);
      margin-bottom: 32px;
      max-width: 550px;
    }
    .hero-actions {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 40px;
    }
    .btn-outline {
      background: transparent;
      border: 2px solid white;
      color: white;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      text-decoration: none;
      transition: 0.3s;
    }
    .btn-outline:hover {
      background: white;
      color: var(--color-text);
    }
    .hero-stats {
      display: flex;
      gap: 40px;
      flex-wrap: wrap;
    }
    .stat-item {
      text-align: left;
    }
    .stat-number {
      font-family: var(--font-number);
      font-size: 3rem;
      font-weight: 900;
      color: var(--color-accent);
    }
    .stat-label {
      font-size: 0.9rem;
      color: rgba(255,255,255,0.7);
    }
    .hero-visual {
      flex: 1 1 400px;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: var(--radius-large);
      min-height: 360px;
      box-shadow: var(--shadow-hover);
      position: relative;
    }
    .hero-visual::after {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(26,26,46,0.4) 0%, transparent 60%);
      border-radius: inherit;
    }

    /* 板块通用 */
    .section {
      padding: 100px 0;
    }
    .section-title {
      font-family: var(--font-heading);
      font-size: 2.5rem;
      font-weight: 700;
      margin-bottom: 16px;
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .title-decor {
      width: 40px;
      height: 3px;
      background: var(--color-accent);
      display: inline-block;
      transform: skewX(-20deg);
    }
    .section-sub {
      font-size: 1.1rem;
      color: var(--color-text-light);
      margin-bottom: 50px;
    }
    .services-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr;
      gap: 24px;
      margin-top: 20px;
    }
    .service-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      border-left: 4px solid var(--color-primary);
      display: flex;
      flex-direction: column;
    }
    .service-card.large {
      grid-row: span 2;
    }
    .service-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    .card-icon {
      font-size: 2.2rem;
      margin-bottom: 16px;
    }
    .service-card h3 {
      font-size: 1.6rem;
      margin-bottom: 12px;
    }
    .arrow-link {
      color: var(--color-primary);
      text-decoration: none;
      font-weight: 600;
      margin-top: auto;
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }
    .stats-wall {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 24px;
      text-align: center;
    }
    .stats-big {
      font-family: var(--font-number);
      font-size: 3.5rem;
      font-weight: 900;
      color: var(--color-primary);
    }
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(2,1fr);
      gap: 28px;
    }
    .case-card {
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
    }
    .case-img {
      height: 240px;
      background-size: cover;
      background-position: center;
      transition: 0.4s;
    }
    .case-card:hover .case-img {
      transform: scale(1.03);
    }
    .case-info {
      padding: 24px;
    }
    .tag {
      background: #f0f0ea;
      color: var(--color-text);
      padding: 4px 12px;
      border-radius: 30px;
      font-size: 0.8rem;
      display: inline-block;
      margin-right: 8px;
    }
    .steps {
      display: flex;
      justify-content: space-between;
      position: relative;
      gap: 20px;
    }
    .step-item {
      text-align: center;
      flex: 1;
    }
    .faq-item {
      background: white;
      border-bottom: 1px solid var(--color-border);
      padding: 18px 0;
      cursor: pointer;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      font-weight: 600;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: 0.3s;
      color: var(--color-text-light);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-top: 12px;
    }
    .cta-banner {
      background: var(--color-secondary);
      border-radius: var(--radius-large);
      padding: 64px 40px;
      text-align: center;
      color: white;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      background: var(--color-secondary);
      color: #ccc;
      padding: 60px 20px;
    }
    @media (max-width: 768px) {
      .nav-menu { display: none; }
      .hamburger { display: flex; }
      .hero h1 { font-size: 2.6rem; }
      .services-grid { grid-template-columns: 1fr; }
      .stats-wall { grid-template-columns: 2fr 2fr; }
      .cases-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
    }