/* roulang page: index */
/* ----- 设计变量 ----- */
    :root {
      --primary: #FF4E00;
      --primary-dark: #E04400;
      --primary-glow: rgba(255,78,0,0.12);
      --secondary: #1A1A2E;
      --accent: #00C9A7;
      --accent-light: rgba(0,201,167,0.2);
      --bg: #F9F9FB;
      --white: #FFFFFF;
      --text: #1A1A2E;
      --text-soft: #5A5A72;
      --text-light: #B0B0C0;
      --border: #E0E0E0;
      --card-radius-lg: 16px;
      --card-radius-md: 12px;
      --btn-radius: 40px;
      --shadow-sm: 0 4px 12px rgba(0,0,0,0.04);
      --shadow-hover: 0 12px 28px var(--primary-glow);
      --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
      --max-width: 1200px;
      --section-gap: 100px;
      --section-gap-mobile: 60px;
      --font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
    }

    /* ----- Reset & Base ----- */
    *, *::before, *::after {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    html {
      scroll-behavior: smooth;
      -webkit-text-size-adjust: 100%;
    }

    body {
      font-family: var(--font-family);
      font-size: 16px;
      line-height: 26px;
      color: var(--text);
      background-color: var(--bg);
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }

    button, input {
      font-family: inherit;
      outline: none;
      border: none;
    }

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

    @media (max-width: 768px) {
      .container {
        padding: 0 16px;
      }
    }

    /* ----- 导航 (Sticky Header) ----- */
    .site-header {
      position: sticky;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(255,255,255,0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(0,0,0,0.04);
      z-index: 1000;
      transition: var(--transition);
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 68px;
      gap: 16px;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 22px;
      color: var(--secondary);
      flex-shrink: 0;
    }

    .logo-icon {
      width: 34px;
      height: 34px;
      background: var(--primary);
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-size: 20px;
      line-height: 1;
      transform: rotate(45deg);
    }

    .logo-icon span {
      transform: rotate(-45deg);
      display: block;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 28px;
      list-style: none;
      font-weight: 500;
      font-size: 15px;
      color: var(--text-soft);
    }

    .nav-links a {
      padding: 6px 0;
      position: relative;
    }

    .nav-links a:hover,
    .nav-links a:focus-visible {
      color: var(--primary);
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width 0.2s ease;
    }

    .nav-links a:hover::after,
    .nav-links a:focus-visible::after {
      width: 100%;
    }

    .btn-primary {
      background: var(--primary);
      color: white;
      font-weight: 600;
      font-size: 15px;
      padding: 12px 24px;
      border-radius: var(--btn-radius);
      transition: var(--transition);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      white-space: nowrap;
      box-shadow: 0 4px 10px rgba(255,78,0,0.25);
      cursor: pointer;
    }

    .btn-primary:hover {
      background: var(--primary-dark);
      transform: scale(1.03);
      box-shadow: 0 8px 18px rgba(255,78,0,0.35);
    }

    .btn-outline {
      background: transparent;
      color: var(--primary);
      border: 2px solid var(--primary);
      font-weight: 600;
      font-size: 15px;
      padding: 11px 24px;
      border-radius: var(--btn-radius);
      transition: var(--transition);
      display: inline-flex;
      align-items: center;
      gap: 6px;
      cursor: pointer;
    }

    .btn-outline:hover {
      background: rgba(255,78,0,0.08);
      transform: scale(1.02);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: transparent;
      border: none;
      cursor: pointer;
      padding: 8px;
    }

    .hamburger span {
      width: 24px;
      height: 2.5px;
      background: var(--secondary);
      border-radius: 2px;
      transition: var(--transition);
    }

    .mobile-menu {
      display: none;
      position: fixed;
      top: 68px;
      left: 0;
      width: 100%;
      background: rgba(255,255,255,0.98);
      backdrop-filter: blur(15px);
      padding: 24px;
      border-bottom: 1px solid var(--border);
      flex-direction: column;
      gap: 20px;
      z-index: 999;
    }

    .mobile-menu.active {
      display: flex;
    }

    .mobile-menu .nav-links {
      flex-direction: column;
      align-items: flex-start;
      gap: 18px;
      font-size: 18px;
    }

    .mobile-cta {
      margin-top: 12px;
      width: 100%;
    }

    @media (max-width: 768px) {
      .desktop-nav {
        display: none;
      }
      .hamburger {
        display: flex;
      }
    }

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

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

    .section-title {
      font-size: 28px;
      font-weight: 600;
      line-height: 1.3;
      margin-bottom: 16px;
      color: var(--secondary);
    }

    .section-sub {
      font-size: 16px;
      color: var(--text-soft);
      max-width: 680px;
      margin: 0 auto 40px;
    }

    /* ----- Hero ----- */
    .hero {
      background: linear-gradient(180deg, #FFF0EB 0%, var(--bg) 30%);
      padding-top: 40px;
    }

    .hero-grid {
      display: flex;
      align-items: center;
      gap: 48px;
    }

    .hero-content {
      flex: 1;
    }

    .hero h1 {
      font-size: 42px;
      font-weight: 700;
      line-height: 1.2;
      letter-spacing: -0.5px;
      color: var(--secondary);
      margin-bottom: 20px;
    }

    .hero-sub {
      font-size: 18px;
      color: var(--text-soft);
      line-height: 1.6;
      margin-bottom: 32px;
    }

    .hero-buttons {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      margin-bottom: 36px;
    }

    .hero-visual {
      flex: 1;
      position: relative;
    }

    .hero-img-card {
      background: var(--white);
      border-radius: 24px;
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      position: relative;
    }

    .hero-img-card img {
      width: 100%;
      height: auto;
      object-fit: cover;
    }

    .badge-float {
      position: absolute;
      background: white;
      border-radius: 12px;
      padding: 12px 16px;
      box-shadow: 0 6px 16px rgba(0,0,0,0.06);
      display: flex;
      flex-direction: column;
      align-items: center;
    }

    .badge-float .badge-num {
      font-weight: 700;
      font-size: 22px;
      color: var(--secondary);
    }

    .badge-float .badge-label {
      font-size: 13px;
      color: var(--text-soft);
      white-space: nowrap;
    }

    .badge-1 { top: -12px; right: -12px; }
    .badge-2 { bottom: 18px; left: -16px; }
    .badge-3 { bottom: -8px; right: 22px; }

    @media (max-width: 1024px) {
      .hero h1 {
        font-size: 36px;
      }
    }

    @media (max-width: 768px) {
      .hero-grid {
        flex-direction: column;
      }
      .hero h1 {
        font-size: 32px;
      }
      .badge-float {
        padding: 8px 12px;
      }
      .badge-1 { top: -8px; right: 8px; }
      .badge-2 { bottom: 12px; left: 4px; }
    }

    /* ----- 痛点区 ----- */
    .problem-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .problem-card {
      background: #F2F2F5;
      border-radius: var(--card-radius-lg);
      padding: 28px 24px;
    }

    .problem-icon {
      font-size: 24px;
      margin-bottom: 12px;
      color: var(--primary);
    }

    .problem-card p {
      font-weight: 500;
      color: var(--secondary);
      line-height: 1.5;
    }

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

    /* ----- 解决方案左文右图 ----- */
    .solution-row {
      display: flex;
      align-items: center;
      gap: 48px;
    }

    .solution-text {
      flex: 1;
    }

    .solution-list {
      list-style: none;
      margin-top: 20px;
    }

    .solution-list li {
      display: flex;
      gap: 12px;
      margin-bottom: 14px;
      font-weight: 500;
      color: var(--secondary);
    }

    .solution-list li::before {
      content: "✓";
      color: var(--accent);
      font-weight: 700;
    }

    .solution-img {
      flex: 1;
      background: var(--white);
      border-radius: var(--card-radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }

    @media (max-width: 768px) {
      .solution-row {
        flex-direction: column;
      }
    }

    /* ----- 优势卡片 ----- */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .feature-card {
      background: var(--white);
      border-radius: var(--card-radius-lg);
      padding: 32px 24px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

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

    .feature-icon {
      font-size: 40px;
      color: var(--primary);
    }

    .feature-card h3 {
      font-size: 20px;
      font-weight: 600;
    }

    .feature-tag {
      align-self: flex-start;
      background: rgba(0,201,167,0.1);
      color: var(--accent);
      font-weight: 600;
      font-size: 13px;
      padding: 4px 10px;
      border-radius: 20px;
    }

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

    /* ----- 数据深色区 ----- */
    .results-bg {
      background: linear-gradient(135deg, #FF4E00 0%, #1A1A2E 100%);
      color: white;
      border-radius: 32px;
      padding: 60px 32px;
      text-align: center;
    }

    .stats-row {
      display: flex;
      justify-content: center;
      gap: 48px;
      flex-wrap: wrap;
    }

    .stat-item {
      font-size: 42px;
      font-weight: 700;
    }

    .stat-label {
      font-size: 15px;
      opacity: 0.8;
    }

    .report-link {
      display: inline-block;
      margin-top: 28px;
      color: white;
      border-bottom: 1px solid rgba(255,255,255,0.4);
      font-weight: 500;
    }

    .report-link:hover {
      border-color: white;
    }

    /* ----- 证言网格 ----- */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }

    .case-card {
      background: #F4F4F7;
      border-radius: var(--card-radius-md);
      padding: 24px;
      display: flex;
      gap: 18px;
      border-left: 4px solid var(--primary);
    }

    .case-avatar {
      width: 56px;
      height: 56px;
      border-radius: 50%;
      object-fit: cover;
      flex-shrink: 0;
    }

    .case-quote {
      font-style: italic;
      color: var(--text-soft);
      margin-top: 8px;
    }

    .partner-wall {
      display: flex;
      justify-content: center;
      gap: 32px;
      margin-top: 40px;
      filter: grayscale(1);
      opacity: 0.7;
    }

    .partner-wall img {
      height: 32px;
      width: auto;
    }

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

    /* ----- FAQ ----- */
    .faq-list {
      display: flex;
      flex-direction: column;
      gap: 12px;
      max-width: 800px;
      margin: 0 auto;
    }

    .faq-item {
      background: var(--white);
      border-radius: var(--card-radius-md);
      padding: 18px 24px;
      cursor: pointer;
      box-shadow: var(--shadow-sm);
      transition: background 0.2s;
    }

    .faq-item.active {
      background: #F9F9FB;
    }

    .faq-question {
      display: flex;
      justify-content: space-between;
      font-weight: 600;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.2s;
      color: var(--text-soft);
    }

    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-top: 12px;
    }

    /* ----- CTA ----- */
    .cta-block {
      background: linear-gradient(135deg, #FF4E00 0%, #1A1A2E 100%);
      border-radius: 32px;
      padding: 64px 24px;
      text-align: center;
      color: white;
    }

    .cta-form {
      display: flex;
      max-width: 480px;
      margin: 28px auto 0;
      gap: 12px;
    }

    .cta-input {
      flex: 1;
      padding: 14px 20px;
      border-radius: 40px;
      background: white;
      font-size: 16px;
    }

    .btn-accent {
      background: var(--accent);
      color: white;
      border-radius: 40px;
      padding: 14px 28px;
      font-weight: 600;
      cursor: pointer;
      transition: var(--transition);
    }

    .btn-accent:hover {
      filter: brightness(1.1);
    }

    @media (max-width: 520px) {
      .cta-form {
        flex-direction: column;
      }
    }

    /* ----- Footer ----- */
    .footer {
      background: #1A1A2E;
      color: #B0B0C0;
      padding: 48px 0 24px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
    }

    .footer h4 {
      color: white;
      margin-bottom: 16px;
    }

    .footer a:hover {
      color: var(--primary);
    }

    .footer-bottom {
      border-top: 1px solid rgba(255,255,255,0.1);
      margin-top: 32px;
      padding-top: 20px;
      text-align: center;
      font-size: 14px;
    }

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