/* roulang page: index */
:root {
      --red: #C8102E;
      --red-hover: #A00D24;
      --black: #1A1A1A;
      --warm-gray: #F5F1EC;
      --gold: #C9A84C;
      --off-white: #FAF8F5;
      --border-light: #E8E3DC;
      --text-dark: #1A1A1A;
      --text-soft: #4A4A4A;
      --white: #FFFFFF;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.06);
      --shadow-hover: 0 8px 32px rgba(0,0,0,0.10);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-tag: 6px;
      --transition: 0.25s ease;
      --container-max: 1280px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', system-ui, sans-serif;
      background-color: var(--warm-gray);
      color: var(--text-dark);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    img {
      max-width: 100%;
      display: block;
    }
    button, .btn {
      cursor: pointer;
      font-family: inherit;
    }
    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: var(--white);
      box-shadow: 0 2px 12px rgba(0,0,0,0.04);
      z-index: 1000;
      height: 72px;
      display: flex;
      align-items: center;
      transition: var(--transition);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    .logo {
      display: flex;
      align-items: baseline;
      gap: 6px;
    }
    .logo-text {
      font-size: 1.5rem;
      font-weight: 700;
      color: var(--red);
      letter-spacing: 0.5px;
      line-height: 1.2;
    }
    .logo-domain {
      font-size: 0.7rem;
      color: #666;
      letter-spacing: 0.3px;
    }
    .nav-menu {
      display: flex;
      gap: 28px;
      align-items: center;
    }
    .nav-link {
      font-weight: 500;
      color: #333;
      padding: 8px 0;
      border-bottom: 3px solid transparent;
      transition: var(--transition);
      font-size: 0.95rem;
    }
    .nav-link:hover, .nav-link.active {
      color: var(--red);
      border-bottom-color: var(--red);
    }
    .btn-primary {
      background: var(--red);
      color: white;
      padding: 14px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      border: none;
      transition: var(--transition);
      display: inline-block;
      text-align: center;
      font-size: 1rem;
    }
    .btn-primary:hover {
      background: var(--red-hover);
      transform: translateY(-1px);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--red);
      color: var(--red);
      padding: 12px 26px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: var(--transition);
      display: inline-block;
    }
    .btn-outline:hover {
      background: var(--red);
      color: white;
    }
    .btn-ghost {
      background: rgba(255,255,255,0.15);
      border: 1px solid rgba(255,255,255,0.7);
      color: white;
      padding: 14px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      backdrop-filter: blur(4px);
      transition: var(--transition);
    }
    .btn-ghost:hover {
      background: white;
      color: var(--red);
      border-color: white;
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: none;
      border: none;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--red);
      transition: var(--transition);
    }
    /* 移动端导航 */
    @media (max-width: 768px) {
      .nav-menu {
        display: none;
      }
      .hamburger {
        display: flex;
      }
      .header {
        height: 60px;
      }
      .mobile-nav {
        display: none;
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100vh;
        background: var(--warm-gray);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 32px;
        z-index: 999;
      }
      .mobile-nav.active {
        display: flex;
      }
      .mobile-nav .nav-link {
        font-size: 1.4rem;
        border-bottom: none;
      }
      .close-btn {
        position: absolute;
        top: 24px;
        right: 24px;
        font-size: 2rem;
        background: none;
        border: none;
        color: var(--red);
      }
    }
    /* Hero */
    .hero {
      min-height: 100vh;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      display: flex;
      align-items: center;
      position: relative;
      margin-top: 72px;
    }
    .hero-overlay {
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(26,26,26,0.75) 0%, rgba(200,16,46,0.45) 100%);
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 700px;
      color: white;
      padding: 0 24px;
    }
    .hero h1 {
      font-size: 56px;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 24px;
    }
    .hero-sub {
      font-size: 18px;
      opacity: 0.8;
      max-width: 600px;
      margin-bottom: 36px;
    }
    .hero-btns {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }
    @media (max-width: 768px) {
      .hero h1 {
        font-size: 36px;
      }
      .hero {
        margin-top: 60px;
        min-height: 70vh;
      }
      .hero-btns {
        flex-direction: column;
        align-items: flex-start;
      }
    }
    /* 通用板块 */
    section {
      padding: 120px 0;
    }
    .section-title {
      font-size: 40px;
      font-weight: 600;
      margin-bottom: 16px;
      color: var(--black);
    }
    .section-desc {
      color: #555;
      margin-bottom: 48px;
      font-size: 18px;
    }
    @media (max-width: 768px) {
      section {
        padding: 80px 0;
      }
      .section-title {
        font-size: 28px;
      }
    }
    /* 卡片网格 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }
    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 32px;
    }
    @media (max-width: 1024px) and (min-width: 769px) {
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 768px) {
      .grid-3, .grid-2 {
        grid-template-columns: 1fr;
      }
    }
    .feature-card {
      background: var(--off-white);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      text-align: center;
      transition: var(--transition);
      box-shadow: var(--shadow-sm);
    }
    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .icon-circle {
      width: 64px;
      height: 64px;
      background: var(--red);
      border-radius: 50%;
      margin: 0 auto 20px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-size: 28px;
      transition: 0.2s;
    }
    .feature-card:hover .icon-circle {
      transform: scale(1.05);
    }
    .service-card {
      background: var(--off-white);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .service-img {
      height: 200px;
      object-fit: cover;
      width: 100%;
    }
    .service-body {
      padding: 20px;
    }
    .stats-band {
      background: var(--red);
      color: white;
      padding: 60px 0;
    }
    .stats-grid {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      gap: 24px;
      text-align: center;
    }
    .stat-number {
      font-size: 48px;
      font-weight: 700;
      color: var(--gold);
      font-family: 'DIN', 'PingFang SC', sans-serif;
    }
    .case-card {
      display: flex;
      background: var(--off-white);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .case-img {
      width: 45%;
      object-fit: cover;
    }
    .case-info {
      padding: 32px;
      display: flex;
      flex-direction: column;
      justify-content: center;
    }
    @media (max-width: 768px) {
      .case-card {
        flex-direction: column;
      }
      .case-img {
        width: 100%;
        height: 220px;
      }
    }
    .process-step {
      display: flex;
      align-items: flex-start;
      gap: 24px;
    }
    .step-num {
      font-size: 48px;
      font-weight: 700;
      color: var(--red);
      opacity: 0.9;
      line-height: 1;
      min-width: 60px;
    }
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 18px 0;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      font-weight: 600;
      font-size: 20px;
      cursor: pointer;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: 0.3s ease;
      background: #F0EDE8;
      border-radius: 6px;
      margin-top: 8px;
      padding: 0 20px;
    }
    .faq-answer.open {
      max-height: 200px;
      padding: 20px;
    }
    .cta-band {
      background: var(--black);
      color: white;
      text-align: center;
      padding: 100px 0;
    }
    .footer {
      background: var(--black);
      color: rgba(255,255,255,0.6);
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }
    .footer a:hover {
      color: var(--red);
    }