/* roulang page: index */
:root {
      --primary: #E63946;
      --primary-dark: #C62D38;
      --primary-soft: rgba(230, 57, 70, 0.08);
      --secondary-dark: #1D1D1F;
      --accent-gold: #D4A843;
      --accent-gold-soft: rgba(212, 168, 67, 0.15);
      --bg-light: #F7F7F9;
      --white: #FFFFFF;
      --text-primary: #1D1D1F;
      --text-secondary: #5A5A5E;
      --text-tertiary: #8E8E93;
      --border-light: #E5E5EA;
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-chip: 20px;
      --shadow-sm: 0 2px 12px rgba(0,0,0,0.04);
      --shadow-hover: 0 8px 28px rgba(0,0,0,0.08);
      --font-stack: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", sans-serif;
      --section-gap: 110px;
    }

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

    body {
      font-family: var(--font-stack);
      background-color: var(--white);
      color: var(--text-primary);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    h1, h2, h3, h4 {
      margin: 0;
      font-weight: 600;
    }

    a {
      text-decoration: none;
      color: inherit;
    }

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

    /* 导航栏 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      height: 72px;
      background: rgba(255,255,255,0.96);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-light);
      display: flex;
      align-items: center;
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }

    .logo-area {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 1.4rem;
      color: var(--primary);
      letter-spacing: -0.3px;
    }

    .logo-icon {
      font-size: 1.8rem;
      color: var(--primary);
    }

    .nav-tags {
      display: flex;
      align-items: center;
      gap: 6px;
      flex-wrap: wrap;
    }

    .nav-chip {
      background: transparent;
      padding: 8px 18px;
      border-radius: var(--radius-chip);
      color: var(--text-secondary);
      font-weight: 500;
      font-size: 0.95rem;
      transition: all 0.2s;
      white-space: nowrap;
    }

    .nav-chip:hover {
      background: #F0F0F5;
      color: var(--text-primary);
    }

    .nav-chip.active {
      background: var(--primary);
      color: white;
    }

    .header-cta {
      background: var(--primary);
      color: white;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 0.95rem;
      transition: 0.2s;
      white-space: nowrap;
      border: none;
      cursor: pointer;
    }

    .header-cta:hover {
      background: var(--primary-dark);
      transform: scale(1.03);
      box-shadow: 0 4px 14px rgba(230,57,70,0.3);
    }

    .mobile-menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.8rem;
      color: var(--text-primary);
    }

    /* Hero */
    .hero {
      background: var(--secondary-dark);
      min-height: 100vh;
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
      padding: 120px 0 70px;
    }

    .hero-bg-glow {
      position: absolute;
      right: -10%;
      top: 20%;
      width: 600px;
      height: 600px;
      background: radial-gradient(circle, rgba(230,57,70,0.25) 0%, transparent 70%);
      filter: blur(90px);
      z-index: 1;
    }

    .hero-content {
      display: flex;
      align-items: center;
      gap: 50px;
      position: relative;
      z-index: 2;
    }

    .hero-text {
      flex: 0 0 55%;
    }

    .hero-text h1 {
      font-size: clamp(2.4rem, 5vw, 4rem);
      font-weight: 700;
      color: white;
      line-height: 1.15;
      letter-spacing: -0.02em;
      margin-bottom: 1.5rem;
    }

    .hero-sub {
      font-size: 1.3rem;
      color: #C7C7CC;
      margin-bottom: 2rem;
      max-width: 500px;
    }

    .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: 0.2s;
      display: inline-block;
      text-align: center;
      cursor: pointer;
    }

    .btn-primary:hover {
      background: var(--primary-dark);
      transform: scale(1.03);
      box-shadow: 0 6px 20px rgba(230,57,70,0.4);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid white;
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: 0.2s;
      cursor: pointer;
    }

    .btn-outline:hover {
      background: rgba(255,255,255,0.1);
    }

    .hero-image {
      flex: 0 0 40%;
    }

    .hero-image img {
      border-radius: 12px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.5);
      border: 1px solid rgba(255,255,255,0.2);
    }

    .scroll-hint {
      position: absolute;
      bottom: 30px;
      left: 50%;
      transform: translateX(-50%);
      color: rgba(255,255,255,0.6);
      font-size: 2rem;
      animation: bounce 2s infinite;
      z-index: 3;
    }

    @keyframes bounce {
      0%, 20%, 50%, 80%, 100% { transform: translateX(-50%) translateY(0); }
      40% { transform: translateX(-50%) translateY(-12px); }
      60% { transform: translateX(-50%) translateY(-6px); }
    }

    /* 通用章节 */
    .section {
      padding: var(--section-gap) 0;
    }

    .section-title {
      font-size: 2.3rem;
      font-weight: 600;
      margin-bottom: 0.5rem;
      position: relative;
      display: inline-block;
    }

    .section-title::after {
      content: '';
      display: block;
      width: 40px;
      height: 3px;
      background: var(--primary);
      margin-top: 0.5rem;
    }

    .section-sub {
      color: var(--text-secondary);
      font-size: 1.15rem;
      margin-bottom: 3rem;
    }

    /* 核心优势 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .feature-card {
      background: white;
      padding: 28px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      border-left: 4px solid var(--primary);
      transition: 0.25s;
    }

    .feature-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }

    .feature-icon {
      font-size: 2.4rem;
      color: var(--primary);
      margin-bottom: 1.2rem;
    }

    .feature-card h4 {
      font-weight: 600;
      font-size: 1.2rem;
      margin-bottom: 0.6rem;
    }

    /* 服务区 */
    .service-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 80px;
    }

    .service-row.reverse {
      flex-direction: row-reverse;
    }

    .service-img {
      flex: 0 0 48%;
    }

    .service-img img {
      border-radius: 12px;
      box-shadow: var(--shadow-sm);
    }

    .service-text {
      flex: 1;
    }

    .service-text h3 {
      font-size: 1.8rem;
      margin-bottom: 1rem;
    }

    .service-list {
      list-style: none;
      margin: 1.2rem 0;
    }

    .service-list li {
      margin-bottom: 0.6rem;
      display: flex;
      align-items: center;
      gap: 8px;
      color: var(--text-secondary);
    }

    .service-list i {
      color: var(--primary);
    }

    .text-link {
      color: var(--primary);
      font-weight: 600;
      transition: 0.2s;
    }

    .text-link i {
      transition: transform 0.2s;
    }

    .text-link:hover i {
      transform: translateX(5px);
    }

    /* 数据条 */
    .data-strip {
      background: var(--secondary-dark);
      padding: 80px 0;
      color: white;
      text-align: center;
    }

    .data-grid {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      gap: 30px;
    }

    .data-item .number {
      font-size: 3.2rem;
      font-weight: 700;
      color: var(--accent-gold);
      line-height: 1.1;
    }

    .data-item .label {
      color: rgba(255,255,255,0.75);
      margin-top: 0.4rem;
    }

    /* 案例 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .case-card {
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: 0.3s;
    }

    .case-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }

    .case-img {
      height: 200px;
      overflow: hidden;
    }

    .case-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: 0.3s;
    }

    .case-card:hover .case-img img {
      transform: scale(1.04);
    }

    .case-text {
      padding: 20px;
    }

    .case-tag {
      background: var(--accent-gold-soft);
      color: var(--accent-gold);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.8rem;
      font-weight: 600;
      display: inline-block;
      margin-bottom: 8px;
    }

    /* FAQ */
    .accordion-item {
      margin-bottom: 8px;
      border-radius: 8px;
      overflow: hidden;
    }

    .accordion-btn {
      background: #F7F7F9;
      width: 100%;
      text-align: left;
      padding: 18px 24px;
      font-weight: 600;
      font-size: 1.1rem;
      border: none;
      border-left: 4px solid var(--primary);
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      transition: 0.2s;
    }

    .accordion-content {
      background: white;
      padding: 20px 24px;
      display: none;
      line-height: 1.8;
      color: var(--text-secondary);
    }

    .accordion-item.active .accordion-content {
      display: block;
    }

    /* CTA */
    .cta-section {
      background: linear-gradient(135deg, #1D1D1F 0%, #2a1e1f 100%);
      padding: 80px 0;
      color: white;
      text-align: center;
    }

    .contact-form {
      max-width: 600px;
      margin: 2rem auto 0;
      background: rgba(255,255,255,0.06);
      backdrop-filter: blur(8px);
      padding: 32px;
      border-radius: 12px;
    }

    .contact-form input,
    .contact-form textarea {
      background: rgba(255,255,255,0.1);
      border: 1px solid rgba(255,255,255,0.3);
      border-radius: 8px;
      padding: 12px;
      color: white;
      width: 100%;
      margin-bottom: 16px;
    }

    .contact-form input:focus,
    .contact-form textarea:focus {
      border-color: white;
      outline: none;
    }

    .footer {
      background: #1D1D1F;
      color: #C7C7CC;
      padding: 60px 0 20px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
    }

    .footer a {
      color: #C7C7CC;
    }

    .footer a:hover {
      color: white;
    }

    .copyright {
      border-top: 1px solid rgba(255,255,255,0.1);
      margin-top: 40px;
      padding-top: 20px;
      font-size: 0.85rem;
      text-align: center;
    }

    @media (max-width: 1024px) {
      .features-grid { grid-template-columns: repeat(2,1fr); }
      .cases-grid { grid-template-columns: repeat(2,1fr); }
      .service-row { flex-direction: column; }
      .service-row.reverse { flex-direction: column; }
      .hero-content { flex-direction: column; }
    }

    @media (max-width: 640px) {
      .nav-tags, .header-cta { display: none; }
      .mobile-menu-toggle { display: block; }
      .features-grid, .cases-grid { grid-template-columns: 1fr; }
      .data-grid { flex-direction: column; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .hero-text h1 { font-size: 2.2rem; }
    }