/* roulang page: index */
:root {
      --primary: #3D5AFE;
      --primary-deep: #2A3FCC;
      --primary-shallow: #EBEEFF;
      --green: #00B578;
      --orange: #FF9F0A;
      --red: #FA5151;
      --text-dark: #1F2329;
      --text-gray: #86909C;
      --bg-light: #F5F6FA;
      --card-white: #FFFFFF;
      --line: #E8EAED;
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-capsule: 40px;
      --shadow-card: 0 2px 12px rgba(31, 35, 41, 0.06);
      --shadow-card-hover: 0 4px 20px rgba(31, 35, 41, 0.1);
      --transition: all 0.2s ease;
      --font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      font-family: var(--font-family);
      background-color: var(--bg-light);
      color: var(--text-dark);
      line-height: 1.6;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    button, input {
      font-family: inherit;
      outline: none;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding-left: 32px;
      padding-right: 32px;
    }
    @media (max-width: 768px) {
      .container {
        padding-left: 16px;
        padding-right: 16px;
      }
    }

    /* 导航 */
    .nav-wrapper {
      position: fixed;
      top: 20px;
      left: 0;
      right: 0;
      z-index: 1000;
      display: flex;
      justify-content: center;
      pointer-events: none;
    }
    .nav-capsule {
      pointer-events: auto;
      background: rgba(255,255,255,0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-radius: var(--radius-capsule);
      padding: 12px 28px;
      display: flex;
      align-items: center;
      gap: 28px;
      box-shadow: 0 4px 24px rgba(31,35,41,0.08);
      max-width: 1100px;
      width: fit-content;
      transition: background 0.25s ease, box-shadow 0.25s ease;
    }
    .nav-scrolled {
      background: rgba(255,255,255,0.98);
      box-shadow: 0 6px 28px rgba(31,35,41,0.12);
    }
    .nav-logo {
      font-size: 20px;
      font-weight: 700;
      color: var(--primary);
      white-space: nowrap;
      letter-spacing: -0.3px;
    }
    .nav-links {
      display: flex;
      gap: 20px;
      align-items: center;
    }
    .nav-links a {
      font-size: 15px;
      color: var(--text-dark);
      font-weight: 500;
      padding: 6px 2px;
      border-bottom: 2px solid transparent;
    }
    .nav-links a:hover {
      color: var(--primary);
      border-bottom-color: var(--primary);
    }
    .nav-cta {
      background: var(--primary);
      color: white;
      padding: 8px 20px;
      border-radius: 20px;
      font-size: 14px;
      font-weight: 600;
      border: none;
      cursor: pointer;
      transition: var(--transition);
      white-space: nowrap;
    }
    .nav-cta:hover {
      background: var(--primary-deep);
      transform: scale(1.02);
    }
    .hamburger {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      color: var(--text-dark);
      cursor: pointer;
    }
    @media (max-width: 1023px) {
      .nav-capsule {
        padding: 10px 20px;
        gap: 18px;
      }
      .nav-links {
        gap: 14px;
      }
    }
    @media (max-width: 767px) {
      .nav-wrapper {
        top: 0;
      }
      .nav-capsule {
        width: 100%;
        border-radius: 0;
        justify-content: space-between;
        padding: 12px 16px;
        background: rgba(255,255,255,0.98);
      }
      .nav-links {
        display: none;
        position: fixed;
        top: 60px;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: 32px 24px;
        gap: 24px;
        box-shadow: 0 8px 24px rgba(0,0,0,0.1);
        z-index: 999;
      }
      .nav-links.mobile-open {
        display: flex;
      }
      .nav-links a {
        font-size: 18px;
        border-bottom: none;
      }
      .hamburger {
        display: block;
      }
      .nav-cta {
        display: none;
      }
      .mobile-cta {
        display: block;
        width: 100%;
        background: var(--primary);
        color: white;
        text-align: center;
        padding: 12px;
        border-radius: 8px;
        margin-top: 12px;
        font-weight: 600;
      }
    }
    @media (min-width: 768px) {
      .mobile-cta {
        display: none;
      }
    }

    /* 板块通用 */
    section {
      padding-top: 100px;
      padding-bottom: 100px;
    }
    @media (max-width: 1023px) {
      section {
        padding-top: 80px;
        padding-bottom: 80px;
      }
    }
    @media (max-width: 767px) {
      section {
        padding-top: 60px;
        padding-bottom: 60px;
      }
    }

    h1 {
      font-size: 36px;
      font-weight: 700;
      line-height: 1.3;
      letter-spacing: -0.5px;
      color: var(--text-dark);
    }
    h2 {
      font-size: 28px;
      font-weight: 600;
      line-height: 1.4;
      margin-bottom: 24px;
      color: var(--text-dark);
    }
    h3 {
      font-size: 20px;
      font-weight: 600;
      line-height: 1.5;
    }
    @media (max-width: 767px) {
      h1 { font-size: 28px; }
      h2 { font-size: 24px; }
      h3 { font-size: 18px; }
    }

    .btn {
      display: inline-block;
      font-weight: 600;
      border-radius: var(--radius-btn);
      cursor: pointer;
      transition: var(--transition);
      text-align: center;
      border: 1.5px solid transparent;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 14px 32px;
      font-size: 16px;
    }
    .btn-primary:hover {
      background: var(--primary-deep);
      transform: scale(1.02);
      box-shadow: 0 8px 18px rgba(61,90,254,0.25);
    }
    .btn-primary:active {
      background: #1F2F99;
      transform: scale(0.98);
    }
    .btn-secondary {
      background: transparent;
      border: 1.5px solid var(--primary);
      color: var(--primary);
      padding: 14px 32px;
      font-size: 16px;
    }
    .btn-secondary:hover {
      background: var(--primary-shallow);
      border-color: var(--primary-deep);
      color: var(--primary-deep);
    }
    .btn-text {
      background: none;
      border: none;
      color: var(--primary);
      padding: 8px 0;
      font-weight: 500;
    }
    .btn-text:hover {
      text-decoration: underline;
    }
    @media (max-width: 767px) {
      .btn-primary, .btn-secondary {
        width: 100%;
        padding: 14px 20px;
      }
    }

    .card {
      background: var(--card-white);
      border-radius: var(--radius-card);
      padding: 24px;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
    }
    .card:hover {
      box-shadow: var(--shadow-card-hover);
      transform: translateY(-2px);
    }

    /* Hero */
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }
    .hero-left h1 {
      margin-bottom: 16px;
    }
    .hero-sub {
      font-size: 18px;
      color: var(--text-gray);
      margin-bottom: 28px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 16px;
    }
    .hero-note {
      font-size: 14px;
      color: var(--text-gray);
    }
    .hero-right img {
      border-radius: 16px;
      animation: float 4s ease-in-out infinite;
    }
    @keyframes float {
      0% { transform: translateY(0); }
      50% { transform: translateY(-6px); }
      100% { transform: translateY(0); }
    }
    @media (max-width: 767px) {
      .hero-grid {
        grid-template-columns: 1fr;
        gap: 32px;
      }
      .hero-right {
        order: -1;
      }
    }

    /* 痛点 */
    .pain-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 32px;
    }
    .pain-icon {
      font-size: 40px;
      color: var(--primary);
      margin-bottom: 12px;
    }
    .pain-tag {
      display: inline-block;
      background: var(--primary-shallow);
      color: var(--primary-deep);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 13px;
      font-weight: 600;
      margin-top: 12px;
    }
    @media (max-width: 767px) {
      .pain-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 解决方案 */
    .solution-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      margin-top: 32px;
    }
    .sol-icon-circle {
      width: 64px;
      height: 64px;
      background: var(--primary-shallow);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 16px;
      transition: var(--transition);
      color: var(--primary);
      font-size: 28px;
    }
    .solution-card:hover .sol-icon-circle {
      background: var(--primary);
      color: white;
    }
    @media (max-width: 1023px) {
      .solution-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 767px) {
      .solution-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 成果数据 */
    .results-strip {
      background: var(--primary);
      color: white;
      padding: 60px 0;
      text-align: center;
    }
    .metrics {
      display: flex;
      justify-content: center;
      gap: 64px;
      flex-wrap: wrap;
    }
    .metric-number {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
    }
    .metric-label {
      font-size: 14px;
      opacity: 0.7;
      margin-top: 8px;
    }
    .compare-bar {
      margin-top: 40px;
      max-width: 500px;
      margin-left: auto;
      margin-right: auto;
      height: 8px;
      background: rgba(255,255,255,0.25);
      border-radius: 8px;
      overflow: hidden;
      position: relative;
    }
    .compare-fill {
      width: 78%;
      height: 100%;
      background: var(--green);
      border-radius: 8px;
    }

    /* 证言 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 32px;
    }
    .testimonial-card {
      border-left: 3px solid var(--primary);
    }
    .testimonial-author {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-top: 16px;
    }
    .avatar-placeholder {
      width: 40px;
      height: 40px;
      background: #E8EAED;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--text-gray);
      font-size: 18px;
    }
    @media (max-width: 767px) {
      .testimonial-grid {
        grid-template-columns: 1fr;
      }
    }

    /* FAQ */
    .faq-list {
      margin-top: 24px;
    }
    .faq-item {
      background: var(--card-white);
      border-radius: var(--radius-card);
      margin-bottom: 8px;
      box-shadow: var(--shadow-card);
      overflow: hidden;
    }
    .faq-question {
      padding: 18px 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      font-weight: 500;
      font-size: 18px;
    }
    .faq-arrow {
      transition: transform 0.3s ease;
      font-size: 20px;
      color: var(--primary);
    }
    .faq-item.active .faq-arrow {
      transform: rotate(180deg);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      color: var(--text-gray);
      font-size: 16px;
      padding: 0 24px;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 0 24px 18px;
    }

    /* 终极CTA */
    .final-cta {
      background: var(--primary);
      color: white;
      text-align: center;
      padding: 80px 0;
    }
    .final-cta h2 {
      color: white;
    }
    .final-btn {
      background: white;
      color: var(--primary);
      padding: 16px 40px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      font-size: 18px;
      margin-top: 24px;
      display: inline-block;
      transition: var(--transition);
    }
    .final-btn:hover {
      background: var(--primary-shallow);
    }
    .final-note {
      margin-top: 16px;
      opacity: 0.8;
      font-size: 14px;
    }

    /* 页脚 */
    footer {
      background: #1F2329;
      color: var(--text-gray);
      padding: 60px 0 24px;
    }
    .footer-grid {
      display: flex;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 32px;
    }
    .footer-links a {
      display: block;
      margin-bottom: 8px;
      color: var(--text-gray);
      font-size: 14px;
    }
    .footer-links a:hover {
      color: white;
    }
    .footer-bottom {
      border-top: 1px solid #333;
      margin-top: 40px;
      padding-top: 20px;
      text-align: center;
      font-size: 13px;
    }