/* roulang page: index */
:root {
      --primary: #00F0A8;
      --primary-glow: rgba(0, 240, 168, 0.25);
      --secondary: #6C3CE1;
      --bg-deep: #0C0C0F;
      --card-bg: #1A1A1F;
      --input-bg: #25252B;
      --border-light: #2E2E35;
      --text-body: #B0B0B8;
      --text-muted: #808088;
      --text-white: #FFFFFF;
      --text-black: #0C0C0F;
      --radius-card: 12px;
      --radius-btn: 8px;
      --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.3);
      --shadow-btn: 0 0 16px rgba(0, 240, 168, 0.3);
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --font-mono: "Inter", "SF Mono", "Roboto Mono", monospace;
      --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }

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

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

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

    h1, h2, h3, h4 {
      color: var(--text-white);
      font-weight: 600;
      line-height: 1.3;
    }

    h1 {
      font-size: clamp(2.6rem, 6vw, 3.8rem);
      font-weight: 700;
      letter-spacing: -0.02em;
      background: linear-gradient(135deg, #00F0A8 0%, #6C3CE1 80%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      margin-bottom: 1rem;
    }

    h2 {
      font-size: clamp(2rem, 5vw, 2.5rem);
      margin-bottom: 1rem;
    }

    h3 {
      font-size: 1.4rem;
      font-weight: 600;
    }

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

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

    img {
      max-width: 100%;
      height: auto;
      display: block;
      border-radius: 16px;
    }

    button, .btn {
      cursor: pointer;
      font-family: var(--font-sans);
      font-weight: 600;
      border: none;
      outline: none;
    }

    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(12, 12, 15, 0.85);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(46, 46, 53, 0.5);
      transition: box-shadow var(--transition);
    }

    .header.scrolled {
      box-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
      height: 72px;
    }

    .logo {
      font-size: 1.8rem;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: 1px;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo span {
      color: white;
      font-weight: 400;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 2rem;
    }

    .nav-links a {
      font-weight: 500;
      font-size: 0.95rem;
      color: var(--text-body);
      position: relative;
      padding: 6px 0;
    }

    .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 {
      color: var(--primary);
    }

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

    .btn-primary {
      background: var(--primary);
      color: var(--text-black);
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      box-shadow: var(--shadow-btn);
      transition: all var(--transition);
      display: inline-block;
      text-align: center;
      border: none;
    }

    .btn-primary:hover {
      filter: brightness(1.15);
      box-shadow: 0 0 24px rgba(0, 240, 168, 0.5);
      transform: scale(1.02);
      color: var(--text-black);
    }

    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--primary);
      color: var(--primary);
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: all var(--transition);
      display: inline-block;
    }

    .btn-outline:hover {
      background: rgba(0, 240, 168, 0.1);
      color: var(--primary);
    }

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

    .hamburger span {
      width: 26px;
      height: 2px;
      background: var(--text-white);
      transition: var(--transition);
    }

    .mobile-menu {
      display: none;
    }

    /* 板块通用 */
    section {
      padding: 100px 0;
    }

    .section-title {
      text-align: center;
      margin-bottom: 3rem;
    }

    /* Hero */
    .hero {
      padding: 140px 0 100px;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      background-blend-mode: overlay;
      background-color: rgba(12, 12, 15, 0.75);
      position: relative;
    }

    .hero-grid {
      display: flex;
      align-items: center;
      gap: 3rem;
    }

    .hero-left {
      flex: 1;
    }

    .hero-left p {
      font-size: 1.2rem;
      margin: 1.5rem 0 2rem;
      color: #d0d0d8;
    }

    .hero-buttons {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }

    .hero-right {
      flex: 1;
      display: flex;
      justify-content: center;
    }

    .glass-panel {
      background: rgba(26, 26, 31, 0.7);
      backdrop-filter: blur(20px);
      border: 1px solid rgba(0, 240, 168, 0.2);
      border-radius: 24px;
      padding: 2rem;
      width: 100%;
      max-width: 360px;
      box-shadow: 0 10px 30px rgba(0,0,0,0.5);
      display: flex;
      flex-direction: column;
      gap: 1.5rem;
    }

    .stat-item {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .stat-label {
      color: var(--text-muted);
      font-size: 0.9rem;
    }

    .stat-value {
      font-family: var(--font-mono);
      font-size: 1.8rem;
      font-weight: 600;
      color: var(--primary);
      text-shadow: 0 0 10px var(--primary-glow);
    }

    /* 痛点卡片 */
    .cards-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 2rem;
    }

    .pain-card {
      background: var(--card-bg);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-card);
      padding: 2rem;
      transition: all var(--transition);
      box-shadow: var(--shadow-card);
    }

    .pain-card:hover {
      border-color: var(--primary);
      box-shadow: 0 0 20px rgba(0,240,168,0.15);
    }

    .icon-glow {
      font-size: 2.2rem;
      color: var(--primary);
      margin-bottom: 1.2rem;
      display: inline-block;
    }

    /* 解决方案图文 */
    .solution-row {
      display: flex;
      align-items: center;
      gap: 3rem;
      margin-bottom: 4rem;
    }

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

    .solution-img, .solution-text {
      flex: 1;
    }

    .solution-text ul {
      list-style: none;
      margin: 1.5rem 0;
    }

    .solution-text li {
      margin-bottom: 0.8rem;
      display: flex;
      align-items: center;
      gap: 0.8rem;
    }

    .solution-text li::before {
      content: '';
      display: inline-block;
      width: 8px;
      height: 8px;
      background: var(--primary);
      border-radius: 50%;
      box-shadow: 0 0 8px var(--primary);
    }

    /* 数据看板 */
    .stats-board {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      gap: 2rem;
    }

    .stat-card {
      text-align: center;
      background: var(--card-bg);
      padding: 2rem;
      border-radius: var(--radius-card);
      border: 1px solid var(--border-light);
      min-width: 180px;
    }

    .big-number {
      font-family: var(--font-mono);
      font-size: 3rem;
      font-weight: 700;
      color: var(--primary);
    }

    /* 证言 */
    .testimonial-grid {
      display: flex;
      gap: 2rem;
      overflow-x: auto;
      padding-bottom: 1rem;
    }

    .testimonial-card {
      background: var(--card-bg);
      border-left: 4px solid var(--primary);
      border-radius: var(--radius-card);
      padding: 2rem;
      min-width: 300px;
      flex: 1;
      font-style: italic;
    }

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

    .faq-question {
      background: transparent;
      width: 100%;
      text-align: left;
      padding: 1.2rem 0;
      font-size: 1.1rem;
      font-weight: 600;
      color: var(--text-white);
      display: flex;
      justify-content: space-between;
      align-items: center;
      border: none;
      cursor: pointer;
    }

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

    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 1.2rem;
    }

    /* 联系表单 */
    .contact-form {
      display: flex;
      flex-direction: column;
      gap: 1.2rem;
      max-width: 480px;
      margin: 0 auto;
    }

    .contact-form input, .contact-form textarea {
      background: var(--input-bg);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-btn);
      padding: 14px;
      color: white;
      font-family: var(--font-sans);
      transition: var(--transition);
    }

    .contact-form input:focus, .contact-form textarea:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(0,240,168,0.2);
      outline: none;
    }

    /* 页脚 */
    .footer {
      border-top: 1px solid var(--primary);
      padding: 3rem 0 1.5rem;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 2rem;
      margin-bottom: 2rem;
    }
    .social-icons i {
      font-size: 1.4rem;
      margin-right: 1rem;
      color: var(--text-muted);
      transition: color var(--transition);
    }
    .social-icons i:hover {
      color: var(--primary);
    }

    @media (max-width: 1024px) {
      .hero-grid, .solution-row {
        flex-direction: column;
      }
      .solution-row.reverse {
        flex-direction: column;
      }
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .mobile-menu {
        display: none;
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background: linear-gradient(135deg, #6C3CE1, #0C0C0F);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 2rem;
        z-index: 999;
      }
      .mobile-menu a {
        font-size: 1.8rem;
        color: white;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }