/* roulang page: index */
:root {
      --primary: #2C3E50;
      --accent: #C49A6C;
      --accent-hover: #B0854F;
      --bg: #FAF9F7;
      --card-bg: #FFFFFF;
      --text: #2D2D2D;
      --text-secondary: #5F6B7A;
      --text-on-accent: #FFFFFF;
      --border-light: #E9E6E0;
      --shadow-sm: 0 2px 12px rgba(0,0,0,0.04);
      --shadow-md: 0 8px 24px rgba(0,0,0,0.08);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-img: 16px;
      --font-stack: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      --container-max: 1200px;
      --nav-height: 64px;
      --section-gap: 80px;
      --section-gap-mobile: 60px;
    }

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

    body {
      font-family: var(--font-stack);
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 40px;
    }

    @media (max-width: 768px) {
      .container {
        padding: 0 20px;
      }
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s ease;
    }

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
      font-size: 1rem;
    }

    /* 导航栏 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--nav-height);
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      box-shadow: 0 1px 8px rgba(0,0,0,0.02);
      z-index: 1000;
      transition: box-shadow 0.25s ease;
    }

    .site-header.scrolled {
      box-shadow: 0 4px 18px rgba(0,0,0,0.06);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 100%;
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 40px;
    }

    .brand {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      font-size: 1.3rem;
      color: var(--primary);
      letter-spacing: 0.5px;
    }

    .brand-icon {
      width: 24px;
      height: 24px;
      background: var(--accent);
      clip-path: polygon(50% 0%, 100% 38%, 82% 100%, 18% 100%, 0% 38%);
      display: inline-block;
    }

    .nav-menu {
      display: flex;
      align-items: center;
      gap: 32px;
    }

    .nav-link {
      font-weight: 500;
      color: var(--text);
      position: relative;
      padding: 4px 0;
      font-size: 0.95rem;
    }

    .nav-link::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--accent);
      transition: width 0.25s ease;
    }

    .nav-link:hover::after,
    .nav-link.active::after {
      width: 100%;
    }

    .nav-link:hover {
      color: var(--primary);
    }

    .btn-nav {
      background: var(--accent);
      color: white;
      padding: 10px 22px;
      border-radius: 30px;
      font-weight: 600;
      font-size: 0.9rem;
      transition: background 0.25s, transform 0.2s;
      margin-left: 12px;
    }

    .btn-nav:hover {
      background: var(--accent-hover);
      transform: translateY(-1px);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
    }

    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--primary);
      transition: 0.2s;
    }

    @media (max-width: 768px) {
      .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 70%;
        max-width: 300px;
        height: 100vh;
        background: white;
        flex-direction: column;
        padding: 80px 30px 30px;
        box-shadow: -8px 0 24px rgba(0,0,0,0.08);
        transition: right 0.3s ease;
        gap: 24px;
        align-items: flex-start;
      }
      .nav-menu.open {
        right: 0;
      }
      .hamburger {
        display: flex;
        z-index: 1001;
      }
      .btn-nav {
        margin-left: 0;
        width: 100%;
        text-align: center;
      }
    }

    /* Hero */
    .hero {
      padding: 140px 0 100px;
      display: flex;
      align-items: center;
      background: linear-gradient(135deg, #FAF9F7 0%, #F3F0EB 100%);
      position: relative;
      overflow: hidden;
    }

    .hero-content {
      display: flex;
      gap: 60px;
      align-items: center;
    }

    .hero-text {
      flex: 1;
      position: relative;
      z-index: 2;
    }

    .hero h1 {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.25;
      color: var(--primary);
      margin-bottom: 20px;
    }

    .hero-sub {
      font-size: 1.2rem;
      color: var(--text-secondary);
      margin-bottom: 32px;
      max-width: 500px;
    }

    .hero-buttons {
      display: flex;
      gap: 18px;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: var(--accent);
      color: white;
      padding: 14px 32px;
      border-radius: 30px;
      font-weight: 600;
      transition: all 0.25s;
      box-shadow: 0 4px 12px rgba(196,154,108,0.3);
    }

    .btn-primary:hover {
      background: var(--accent-hover);
      transform: translateY(-2px);
      box-shadow: 0 8px 20px rgba(196,154,108,0.4);
    }

    .btn-outline {
      border: 1.5px solid var(--primary);
      color: var(--primary);
      padding: 14px 28px;
      border-radius: 30px;
      font-weight: 600;
      transition: 0.25s;
      background: transparent;
    }

    .btn-outline:hover {
      background: rgba(44,62,80,0.05);
      border-color: var(--accent);
      color: var(--accent);
    }

    .hero-image {
      flex: 1;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      border-radius: 24px;
      min-height: 380px;
      box-shadow: var(--shadow-md);
      position: relative;
    }

    @media (max-width: 768px) {
      .hero-content {
        flex-direction: column;
      }
      .hero h1 {
        font-size: 34px;
      }
      .hero-image {
        min-height: 250px;
        width: 100%;
      }
    }

    /* 通用区块 */
    section {
      padding: var(--section-gap) 0;
    }

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

    .section-title {
      font-size: 2rem;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 16px;
    }

    .section-desc {
      color: var(--text-secondary);
      max-width: 700px;
      margin-bottom: 48px;
      font-size: 1.05rem;
    }

    /* 核心优势非对称栅格 */
    .features-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }

    .feature-card {
      background: var(--card-bg);
      padding: 32px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      transition: all 0.25s ease;
      border-left: 4px solid transparent;
    }

    .feature-card:hover {
      box-shadow: var(--shadow-md);
      border-left-color: var(--accent);
      transform: translateY(-4px);
    }

    .feature-card.large {
      grid-column: span 2;
    }

    .feature-icon {
      font-size: 28px;
      color: var(--accent);
      margin-bottom: 16px;
    }

    .feature-card h3 {
      font-size: 1.3rem;
      margin-bottom: 10px;
    }

    @media (max-width: 768px) {
      .features-grid {
        grid-template-columns: 1fr;
      }
      .feature-card.large {
        grid-column: span 1;
      }
    }

    /* 解决方案交替 */
    .solution-row {
      display: flex;
      align-items: center;
      gap: 50px;
      margin-bottom: 80px;
    }

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

    .solution-img {
      flex: 1;
      background-size: cover;
      background-position: center;
      border-radius: var(--radius-img);
      min-height: 300px;
      box-shadow: var(--shadow-sm);
    }

    .solution-text {
      flex: 1;
    }

    @media (max-width: 768px) {
      .solution-row, .solution-row.reverse {
        flex-direction: column;
      }
      .solution-img {
        width: 100%;
      }
    }

    /* 数据 */
    .stats-bg {
      background: #EEEDEA;
      border-radius: 24px;
      padding: 48px;
    }

    .stats-grid {
      display: flex;
      justify-content: space-around;
      text-align: center;
      flex-wrap: wrap;
      gap: 24px;
    }

    .stat-number {
      font-size: 42px;
      font-weight: 700;
      color: var(--primary);
    }

    .stat-label {
      color: var(--text-secondary);
      font-weight: 500;
    }

    /* 证言 */
    .testimonials-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }

    .testimonial-card {
      background: #FFFFFF;
      padding: 28px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
    }

    .testimonial-card.alt {
      background: #F4F3F0;
    }

    @media (max-width: 768px) {
      .testimonials-grid {
        grid-template-columns: 1fr;
      }
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 16px 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;
      color: var(--text-secondary);
    }

    .faq-answer.open {
      max-height: 200px;
      margin-top: 12px;
    }

    /* CTA */
    .cta-section {
      background: var(--primary);
      color: white;
      text-align: center;
      border-radius: 28px;
      padding: 70px 40px;
    }

    .cta-form input {
      padding: 12px 16px;
      border-radius: 30px;
      border: none;
      margin: 8px;
      width: 220px;
    }

    .footer {
      background: #1A252F;
      color: #CBD0D6;
      padding: 60px 0 30px;
    }

    .footer a {
      color: #E0E4E8;
    }