/* roulang page: index */
:root {
      --primary: #1A3C34;
      --primary-deep: #0F2620;
      --accent: #C8923F;
      --accent-hover: #A6782E;
      --bg-warm: #F7F5F0;
      --bg-white: #FFFFFF;
      --text-main: #1E1E1E;
      --text-muted: #5C5C5C;
      --text-light: #B0B8B5;
      --border-soft: #E5E0D8;
      --success: #2D7D46;
      --shadow-card: 0 2px 12px rgba(26, 60, 52, 0.06);
      --shadow-hover: 0 8px 24px rgba(26, 60, 52, 0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-chip: 20px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", system-ui, -apple-system, sans-serif;
      --font-number: "Inter", "SF Pro Display", var(--font-sans);
      --container-max: 1200px;
      --section-gap: 100px;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-warm);
      color: var(--text-main);
      line-height: 1.75;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }

    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }

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

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

    button, input {
      font-family: inherit;
    }

    /* 导航栏 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      box-shadow: 0 1px 0 var(--border-soft);
      z-index: 100;
      padding: 12px 0;
      transition: background 0.25s ease;
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 16px;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      font-size: 1.7rem;
      letter-spacing: 0.02em;
      color: var(--primary);
      line-height: 1.2;
    }

    .logo-icon {
      display: flex;
      align-items: center;
      justify-content: center;
      width: 36px;
      height: 36px;
      background: var(--primary);
      border-radius: 8px;
      position: relative;
    }

    .logo-icon::before {
      content: "▲";
      color: white;
      font-size: 1.3rem;
      transform: rotate(180deg);
      display: block;
      line-height: 1;
    }

    .nav-chips {
      display: flex;
      align-items: center;
      gap: 8px;
      flex-wrap: wrap;
      background: transparent;
    }

    .nav-chip {
      padding: 8px 18px;
      border-radius: var(--radius-chip);
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-muted);
      background: transparent;
      transition: all 0.2s ease;
      white-space: nowrap;
      border: none;
      cursor: pointer;
    }

    .nav-chip.active, .nav-chip:hover {
      background: var(--primary);
      color: white;
      font-weight: 600;
    }

    .btn-primary {
      background: var(--accent);
      color: white;
      font-weight: 600;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      border: none;
      cursor: pointer;
      transition: all 0.25s ease;
      font-size: 1rem;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      letter-spacing: 0.01em;
      box-shadow: 0 4px 10px rgba(200, 146, 63, 0.25);
    }

    .btn-primary:hover {
      background: var(--accent-hover);
      box-shadow: 0 6px 16px rgba(166, 120, 46, 0.35);
      transform: translateY(-1px);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      font-weight: 600;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      transition: 0.25s ease;
      cursor: pointer;
    }

    .btn-outline:hover {
      background: rgba(26, 60, 52, 0.08);
    }

    .btn-ghost {
      background: transparent;
      border: 2px solid white;
      color: white;
      font-weight: 600;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      transition: 0.25s ease;
      cursor: pointer;
    }

    .btn-ghost:hover {
      background: rgba(255,255,255,0.15);
    }

    /* 汉堡菜单隐藏桌面 */
    .hamburger {
      display: none;
      background: none;
      border: none;
      font-size: 2rem;
      color: var(--primary);
      cursor: pointer;
    }

    @media (max-width: 768px) {
      .nav-chips {
        display: none;
        width: 100%;
        flex-direction: column;
        background: white;
        padding: 16px;
        border-radius: 16px;
        margin-top: 10px;
        box-shadow: var(--shadow-hover);
      }
      .nav-chips.mobile-open {
        display: flex;
      }
      .hamburger {
        display: block;
      }
      .header-inner {
        position: relative;
      }
    }

    /* 板块通用 */
    section {
      padding: var(--section-gap) 0;
    }

    @media (max-width: 768px) {
      section {
        padding: 60px 0;
      }
      :root {
        --section-gap: 60px;
      }
    }

    .section-title {
      font-size: clamp(2rem, 5vw, 2.5rem);
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 16px;
      line-height: 1.3;
      position: relative;
      display: inline-block;
    }

    .section-title::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: -8px;
      width: 60px;
      height: 3px;
      background: var(--accent);
      border-radius: 2px;
    }

    .section-sub {
      color: var(--text-muted);
      font-size: 1.1rem;
      margin-bottom: 40px;
      max-width: 700px;
    }

    /* Hero */
    .hero {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      position: relative;
      min-height: 90vh;
      display: flex;
      align-items: center;
      color: white;
      margin-top: 0;
      padding: 120px 0 80px;
    }

    .hero-overlay {
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(26,60,52,0.9) 0%, rgba(15,38,32,0.92) 100%);
    }

    .hero .container {
      position: relative;
      z-index: 2;
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 40px;
    }

    .hero-left {
      flex: 1 1 55%;
    }

    .hero-right {
      flex: 1 1 40%;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
    }

    .hero h1 {
      font-size: clamp(2.5rem, 6vw, 3.5rem);
      font-weight: 700;
      line-height: 1.2;
      letter-spacing: 0.02em;
      margin-bottom: 20px;
    }

    .hero-sub {
      font-size: 1.2rem;
      opacity: 0.85;
      margin-bottom: 28px;
    }

    .metric-card {
      background: linear-gradient(135deg, rgba(255,255,255,0.1) 0%, rgba(247,245,240,0.08) 100%);
      backdrop-filter: blur(8px);
      border-radius: var(--radius-card);
      padding: 20px 16px;
      text-align: center;
      border: 1px solid rgba(255,255,255,0.15);
    }

    .metric-number {
      font-family: var(--font-number);
      font-size: 2.4rem;
      font-weight: 700;
      color: var(--accent);
      line-height: 1.2;
    }

    .metric-label {
      font-size: 0.9rem;
      color: rgba(255,255,255,0.75);
      margin-top: 6px;
    }

    .scroll-indicator {
      position: absolute;
      bottom: 30px;
      left: 50%;
      transform: translateX(-50%);
      font-size: 2rem;
      color: white;
      animation: pulse 2s infinite;
    }

    @keyframes pulse {
      0% { opacity: 0.6; transform: translateX(-50%) translateY(0); }
      50% { opacity: 1; transform: translateX(-50%) translateY(6px); }
      100% { opacity: 0.6; transform: translateX(-50%) translateY(0); }
    }

    /* 服务矩阵 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 20px;
    }

    .service-card {
      background: var(--bg-white);
      border-radius: var(--radius-card);
      padding: 32px 28px;
      box-shadow: var(--shadow-card);
      border-left: 4px solid var(--primary);
      transition: all 0.3s ease;
      display: flex;
      flex-direction: column;
    }

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

    .service-icon {
      font-size: 2.2rem;
      color: var(--accent);
      margin-bottom: 16px;
    }

    .service-card h3 {
      font-size: 1.6rem;
      font-weight: 600;
      margin-bottom: 12px;
    }

    .service-desc {
      color: var(--text-muted);
      margin-bottom: 18px;
      flex: 1;
    }

    .link-more {
      color: var(--accent);
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 4px;
      transition: gap 0.2s;
    }

    .link-more:hover {
      gap: 10px;
    }

    /* 对比区块 */
    .compare-section {
      background: var(--primary-deep);
      color: white;
    }

    .compare-grid {
      display: flex;
      flex-wrap: wrap;
      gap: 40px;
      align-items: center;
    }

    .compare-left, .compare-right {
      flex: 1;
    }

    .compare-item {
      display: flex;
      align-items: center;
      gap: 16px;
      margin-bottom: 24px;
      font-size: 1.2rem;
    }

    .old-style {
      text-decoration: line-through;
      color: #9aa0a0;
    }

    .new-style {
      color: var(--accent);
      font-weight: 700;
    }

    .bar-chart {
      display: flex;
      gap: 24px;
      align-items: flex-end;
      height: 140px;
    }

    .bar {
      width: 50px;
      background: var(--accent);
      border-radius: 8px 8px 0 0;
      transition: height 0.4s;
    }

    /* 优势 */
    .advantage-row {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 40px;
      margin-bottom: 60px;
    }

    .advantage-text {
      flex: 1;
    }
    .advantage-img {
      flex: 1;
      border-radius: var(--radius-card);
      overflow: hidden;
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      border-bottom: 1px solid var(--border-soft);
    }
    .faq-question {
      width: 100%;
      background: none;
      border: none;
      padding: 20px 0;
      font-size: 1.2rem;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      text-align: left;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-muted);
    }
    .faq-answer.open {
      max-height: 300px;
      padding-bottom: 20px;
    }

    /* CTA */
    .cta-section {
      background: var(--primary);
      color: white;
    }
    .form-row {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      margin-top: 24px;
    }
    .form-input {
      background: rgba(255,255,255,0.1);
      border: 1px solid rgba(255,255,255,0.3);
      padding: 14px 18px;
      border-radius: 8px;
      color: white;
      flex: 1;
    }
    .form-input::placeholder {
      color: rgba(255,255,255,0.6);
    }

    footer {
      background: var(--primary-deep);
      color: var(--text-light);
      padding: 48px 0 24px;
    }

    @media (max-width: 768px) {
      .services-grid { grid-template-columns: 1fr; }
      .hero-right { grid-template-columns: 1fr; }
      .compare-grid { flex-direction: column; }
    }