/* roulang page: index */
:root {
      --milan-red: #C41E3A;
      --milan-red-deep: #A01830;
      --milan-green: #0A3D2E;
      --sand-bg: #F5F0E8;
      --white: #FFFFFF;
      --text-primary: #1E1E1E;
      --text-secondary: #5C5C5C;
      --text-light: #FDFBF7;
      --card-shadow: 0 4px 12px rgba(10,61,46,0.08);
      --card-shadow-hover: 0 8px 24px rgba(196,30,58,0.12);
      --border-radius-card: 12px;
      --border-radius-btn: 8px;
      --border-radius-download: 12px;
      --font-heading: 'Noto Sans SC', sans-serif;
      --font-body: 'Noto Sans SC', sans-serif;
      --font-mono: 'Inter', sans-serif;
      --max-width: 1200px;
      --section-gap: 80px;
    }

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

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

    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: var(--font-body);
      font-weight: 600;
      border: none;
      background: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      transition: all 0.25s ease;
    }

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

    @media (max-width: 767px) {
      .container {
        padding: 0 16px;
      }
      :root {
        --section-gap: 60px;
      }
    }

    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 100;
      background: transparent;
      transition: background 0.4s ease, box-shadow 0.3s ease;
      padding: 16px 0;
    }
    .header.scrolled {
      background: rgba(10, 61, 46, 0.95);
      box-shadow: 0 4px 12px rgba(0,0,0,0.15);
      padding: 12px 0;
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    .logo {
      font-family: var(--font-heading);
      font-weight: 700;
      font-size: 1.6rem;
      letter-spacing: -0.02em;
      color: var(--text-light);
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo i {
      color: var(--milan-red);
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-links a {
      font-weight: 500;
      color: var(--text-light);
      position: relative;
      padding: 4px 0;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--milan-red);
      transition: width 0.25s ease;
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .menu-toggle {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: none;
      border: none;
      cursor: pointer;
    }
    .menu-toggle span {
      width: 26px;
      height: 2px;
      background: var(--text-light);
      transition: all 0.3s ease;
      display: block;
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: rgba(10,61,46,0.98);
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 40px;
      z-index: 99;
    }
    .mobile-menu.active {
      display: flex;
    }
    .mobile-menu a {
      color: var(--text-light);
      font-size: 1.6rem;
      font-weight: 500;
    }

    @media (max-width: 767px) {
      .nav-links { display: none; }
      .menu-toggle { display: flex; }
      .header-inner { padding: 0 16px; }
    }

    /* Hero */
    .hero {
      background: linear-gradient(135deg, rgba(10,61,46,0.7) 0%, rgba(0,0,0,0.4) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 100vh;
      display: flex;
      align-items: center;
      color: var(--text-light);
      padding-top: 80px;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }
    .hero-text h1 {
      font-family: var(--font-heading);
      font-size: 3rem;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 20px;
    }
    .hero-text p {
      font-size: 1.25rem;
      margin-bottom: 32px;
      opacity: 0.9;
    }
    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--milan-red);
      color: white;
      padding: 14px 32px;
      border-radius: var(--border-radius-btn);
      font-weight: 600;
    }
    .btn-primary:hover {
      background: var(--milan-red-deep);
      transform: scale(1.02);
    }
    .btn-outline {
      border: 2px solid var(--milan-red);
      color: var(--milan-red);
      background: transparent;
      padding: 14px 32px;
      border-radius: var(--border-radius-btn);
    }
    .btn-outline:hover {
      background: rgba(196,30,58,0.1);
    }
    .hero-image img {
      border-radius: 24px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.3);
    }
    @media (max-width: 1024px) {
      .hero-grid { grid-template-columns: 1fr; text-align: center; }
      .hero-image { max-width: 400px; margin: 0 auto; }
      .btn-group { justify-content: center; }
    }

    /* 区块通用 */
    section {
      padding: var(--section-gap) 0;
    }
    .section-title {
      font-family: var(--font-heading);
      font-size: 2.25rem;
      font-weight: 700;
      margin-bottom: 16px;
      text-align: center;
    }
    .section-sub {
      color: var(--text-secondary);
      text-align: center;
      margin-bottom: 48px;
    }

    /* 痛点 */
    .pain-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .pain-card {
      background: var(--white);
      padding: 32px 24px;
      border-radius: var(--border-radius-card);
      border: 1px solid #E5DDD2;
      transition: border 0.2s;
    }
    .pain-card:hover {
      border-color: var(--milan-red);
    }
    .pain-icon {
      font-size: 2rem;
      color: var(--milan-red);
      margin-bottom: 16px;
    }
    @media (max-width: 767px) {
      .pain-grid { grid-template-columns: 1fr; }
    }

    /* 功能图文 */
    .feature-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
      margin-bottom: 80px;
    }
    .feature-row.reverse {
      direction: rtl;
    }
    .feature-row.reverse .feature-content {
      direction: ltr;
    }
    .feature-img img {
      border-radius: 16px;
      box-shadow: var(--card-shadow);
    }
    @media (max-width: 767px) {
      .feature-row { grid-template-columns: 1fr; gap: 32px; }
      .feature-row.reverse { direction: ltr; }
    }

    /* 数据区 */
    .data-section {
      background: var(--milan-green);
      color: var(--text-light);
    }
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 40px;
      text-align: center;
    }
    .stat-number {
      font-family: var(--font-mono);
      font-size: 3.5rem;
      font-weight: 600;
    }
    @media (max-width: 767px) {
      .stats-grid { grid-template-columns: 1fr; }
    }

    /* 证言 */
    .testimonial-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 16px;
      scrollbar-width: none;
    }
    .testimonial-scroll::-webkit-scrollbar { display: none; }
    .testimonial-card {
      min-width: 280px;
      background: white;
      padding: 24px;
      border-radius: var(--border-radius-card);
      box-shadow: var(--card-shadow);
    }

    /* CTA */
    .cta-block {
      background: var(--milan-red);
      text-align: center;
      padding: 64px 24px;
      color: white;
      border-radius: 24px;
    }
    .download-btns {
      display: flex;
      gap: 24px;
      justify-content: center;
      flex-wrap: wrap;
    }
    .btn-download {
      background: var(--milan-green);
      color: white;
      padding: 16px 36px;
      border-radius: var(--border-radius-download);
      font-weight: 600;
    }

    /* FAQ */
    .faq-item {
      background: white;
      border-radius: 8px;
      margin-bottom: 12px;
      overflow: hidden;
    }
    .faq-question {
      font-weight: 700;
      padding: 20px;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: #F9F7F4;
      padding: 0 20px;
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
      padding: 20px;
    }

    /* 页脚 */
    .footer {
      background: var(--milan-green);
      color: var(--text-light);
      padding: 48px 0 24px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1fr 1fr 1fr;
      gap: 32px;
    }
    @media (max-width: 767px) {
      .footer-grid { grid-template-columns: 1fr; }
    }

    .floating-download {
      display: none;
      position: fixed;
      bottom: 20px;
      left: 0; right: 0;
      text-align: center;
      z-index: 90;
    }
    @media (max-width: 767px) {
      .floating-download { display: block; }
    }