/* roulang page: index */
:root {
      --primary: #E94E1B;
      --primary-dark: #C03A0E;
      --primary-glow: rgba(233,78,27,0.35);
      --secondary: #1E1E1E;
      --gray-deep: #2B2B2B;
      --warm-white: #F7F5F0;
      --accent-gold: #F5A623;
      --success: #2EAD71;
      --error: #D0021B;
      --text-body: #2B2B2B;
      --text-weak: #666666;
      --border-light: #D9D9D9;
      --bg-light: #EDEBE6;
      --shadow-card: 0 4px 20px rgba(0,0,0,0.06);
      --shadow-card-hover: 0 8px 30px rgba(0,0,0,0.10);
      --radius-card: 16px;
      --radius-btn: 8px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
      --font-number: "DIN Alternate", "Roboto", sans-serif;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--warm-white);
      color: var(--text-body);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    button, .btn {
      cursor: pointer;
      font-family: inherit;
    }
    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: white;
      box-shadow: 0 1px 0 rgba(0,0,0,0.06);
      z-index: 1000;
      display: flex;
      align-items: center;
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    .logo {
      font-size: 1.6rem;
      font-weight: 700;
      color: var(--secondary);
      letter-spacing: -0.5px;
      display: flex;
      align-items: center;
      gap: 8px;
      white-space: nowrap;
    }
    .logo span {
      color: var(--primary);
    }
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
    }
    .nav-menu a {
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--secondary);
      padding: 8px 0;
      position: relative;
      transition: color 0.2s;
    }
    .nav-menu a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 50%;
      transform: translateX(-50%);
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width 0.2s ease;
    }
    .nav-menu a:hover {
      color: var(--primary);
    }
    .nav-menu a:hover::after {
      width: 100%;
    }
    .nav-cta {
      background: var(--primary);
      color: white;
      padding: 12px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 0.95rem;
      border: none;
      transition: background 0.2s, box-shadow 0.2s;
      white-space: nowrap;
    }
    .nav-cta:hover {
      background: var(--primary-dark);
      box-shadow: 0 6px 18px var(--primary-glow);
    }
    .mobile-toggle {
      display: none;
      background: none;
      border: none;
      flex-direction: column;
      gap: 5px;
      padding: 10px;
    }
    .mobile-toggle span {
      display: block;
      width: 25px;
      height: 2px;
      background: var(--secondary);
      border-radius: 2px;
      transition: 0.2s;
    }
    .mobile-menu {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: rgba(30,30,30,0.97);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 28px;
      z-index: 999;
      transform: translateY(-100%);
      transition: transform 0.4s ease;
    }
    .mobile-menu.active {
      transform: translateY(0);
    }
    .mobile-menu a {
      color: white;
      font-size: 1.4rem;
      font-weight: 500;
    }
    .mobile-close {
      position: absolute;
      top: 24px;
      right: 24px;
      background: none;
      border: none;
      color: white;
      font-size: 2rem;
    }
    /* Hero */
    .hero {
      height: 100vh;
      min-height: 600px;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      position: relative;
      display: flex;
      align-items: center;
      margin-top: 0;
    }
    .hero-overlay {
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(0,0,0,0.65) 0%, rgba(0,0,0,0.2) 100%);
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 700px;
      color: white;
    }
    .hero h1 {
      font-size: clamp(2rem, 5vw, 3.5rem);
      font-weight: 700;
      line-height: 1.2;
      letter-spacing: -0.02em;
      margin-bottom: 20px;
    }
    .hero-sub {
      font-size: 1.2rem;
      opacity: 0.9;
      margin-bottom: 32px;
      line-height: 1.6;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      border: none;
      transition: 0.25s ease;
      box-shadow: 0 4px 12px rgba(233,78,27,0.3);
    }
    .btn-primary:hover {
      background: var(--primary-dark);
      box-shadow: 0 8px 22px var(--primary-glow);
      transform: scale(1.02);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid white;
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: 0.25s;
    }
    .btn-outline:hover {
      background: white;
      color: var(--primary);
    }
    .scroll-hint {
      position: absolute;
      bottom: 30px;
      left: 50%;
      transform: translateX(-50%);
      animation: bounce 2s infinite;
      color: white;
      opacity: 0.8;
    }
    @keyframes bounce {
      0%,100%{ transform: translateX(-50%) translateY(0); }
      50%{ transform: translateX(-50%) translateY(-8px); }
    }
    /* 通用板块 */
    section {
      padding: 100px 0;
    }
    .section-title {
      font-size: 2.2rem;
      font-weight: 700;
      margin-bottom: 16px;
      position: relative;
      display: inline-block;
    }
    .section-title::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: -8px;
      width: 40px;
      height: 3px;
      background: var(--primary);
    }
    .text-center .section-title::after {
      left: 50%;
      transform: translateX(-50%);
    }
    /* 痛点区 */
    .pain-grid {
      display: flex;
      gap: 40px;
      align-items: center;
      flex-wrap: wrap;
    }
    .pain-text {
      flex: 1;
    }
    .pain-image {
      flex: 1;
      border-radius: var(--radius-card);
      overflow: hidden;
    }
    /* 解决方案卡片 */
    .solutions-grid {
      display: grid;
      grid-template-columns: 8fr 4fr;
      gap: 24px;
    }
    .solution-main {
      display: flex;
      background: white;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      overflow: hidden;
    }
    .solution-main img {
      width: 45%;
      object-fit: cover;
    }
    .solution-main .info {
      padding: 32px;
    }
    .solution-side {
      display: flex;
      flex-direction: column;
      gap: 24px;
    }
    .solution-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 28px;
      box-shadow: var(--shadow-card);
      transition: 0.25s;
    }
    .solution-card:hover {
      box-shadow: var(--shadow-card-hover);
      transform: translateY(-3px);
    }
    /* 服务卡片横向滑动 */
    .service-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 10px;
      scroll-snap-type: x mandatory;
      -webkit-overflow-scrolling: touch;
    }
    .service-item {
      min-width: 280px;
      background: white;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      scroll-snap-align: start;
      transition: 0.2s;
    }
    .service-item:hover {
      box-shadow: var(--shadow-card-hover);
    }
    .service-item img {
      width: 100%;
      height: 180px;
      object-fit: cover;
    }
    .service-item .text {
      padding: 20px;
    }
    /* 案例 */
    .case-block {
      background: var(--bg-light);
      padding: 60px;
      border-radius: var(--radius-card);
    }
    .testimonial {
      font-size: 1.2rem;
      font-style: italic;
      margin: 20px 0;
    }
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid #E8E8E8;
      padding: 20px 0;
    }
    .faq-question {
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
    }
    /* CTA */
    .cta-full {
      background: linear-gradient(135deg, #E94E1B 0%, #C03A0E 100%);
      color: white;
      padding: 80px 0;
    }
    .form-row {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .form-input {
      flex: 1;
      padding: 12px 16px;
      border-radius: var(--radius-btn);
      border: 1px solid var(--border-light);
      font-size: 1rem;
    }
    .btn-dark {
      background: var(--secondary);
      color: white;
      border: none;
      padding: 14px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
    }
    /* 页脚 */
    .footer {
      background: #1E1E1E;
      color: #B0B0B0;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
    }
    @media (max-width: 992px) {
      .nav-menu { display: none; }
      .mobile-toggle { display: flex; }
      .solutions-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 768px) {
      section { padding: 70px 0; }
      .hero { height: 70vh; }
      .pain-grid { flex-direction: column; }
      .solution-main { flex-direction: column; }
      .solution-main img { width: 100%; height: 200px; }
      .footer-grid { grid-template-columns: 1fr; }
    }