/* roulang page: index */
:root {
      --deep-blue: #0A0E27;
      --card-bg: #131832;
      --cyan: #00F0FF;
      --cyan-hover: #33F5FF;
      --red: #FF4655;
      --light-bg: #F0F2F8;
      --white: #FFFFFF;
      --text-primary-dark: #FFFFFF;
      --text-secondary-dark: #B0B8D0;
      --text-primary-light: #1A1F3A;
      --text-secondary-light: #4A4F6A;
      --border-subtle: rgba(0, 240, 255, 0.15);
      --shadow-card: 0 12px 28px rgba(0, 0, 0, 0.5);
      --radius-card: 16px;
      --radius-btn: 10px;
      --transition: all 0.25s ease;
      --container-max: 1280px;
    }

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

    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      background-color: var(--deep-blue);
      color: var(--text-secondary-dark);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }

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

    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(10, 14, 39, 0.88);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      z-index: 100;
      border-bottom: 1px solid rgba(0, 240, 255, 0.15);
    }

    .nav {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }

    .logo {
      font-size: 1.8rem;
      font-weight: 700;
      letter-spacing: -0.3px;
      color: var(--white);
      text-decoration: none;
      display: flex;
      align-items: center;
    }
    .logo span {
      color: var(--cyan);
      font-weight: 800;
    }

    .nav-links {
      display: flex;
      gap: 2.5rem;
      list-style: none;
    }
    .nav-links a {
      color: var(--text-secondary-dark);
      text-decoration: none;
      font-weight: 500;
      font-size: 1rem;
      transition: var(--transition);
      position: relative;
      padding-bottom: 6px;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--cyan);
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--cyan);
      transition: width 0.25s ease;
    }
    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }

    .menu-toggle {
      display: none;
      background: none;
      border: none;
      color: var(--cyan);
      font-size: 1.8rem;
      cursor: pointer;
    }

    /* 按钮 */
    .btn-primary {
      background: var(--cyan);
      color: var(--deep-blue);
      font-weight: 700;
      padding: 14px 34px;
      border-radius: var(--radius-btn);
      border: none;
      font-size: 1rem;
      cursor: pointer;
      transition: var(--transition);
      display: inline-block;
      text-decoration: none;
      letter-spacing: 0.3px;
    }
    .btn-primary:hover {
      background: var(--cyan-hover);
      transform: scale(1.02);
      box-shadow: 0 0 20px rgba(0,240,255,0.5);
    }

    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--cyan);
      color: var(--cyan);
      font-weight: 600;
      padding: 14px 34px;
      border-radius: var(--radius-btn);
      font-size: 1rem;
      cursor: pointer;
      transition: var(--transition);
      display: inline-block;
      text-decoration: none;
    }
    .btn-outline:hover {
      background: rgba(0,240,255,0.08);
      border-color: var(--cyan-hover);
      color: var(--cyan-hover);
      transform: translateY(-2px);
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      background: linear-gradient(140deg, rgba(10,14,39,0.9) 0%, rgba(19,24,50,0.8) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      display: flex;
      align-items: center;
      position: relative;
    }
    .hero-content {
      max-width: 800px;
      margin-top: 40px;
    }
    .hero h1 {
      font-size: 3.2rem;
      font-weight: 700;
      line-height: 1.2;
      color: var(--white);
      margin-bottom: 1.5rem;
    }
    .hero h1 em {
      font-style: normal;
      color: var(--cyan);
      text-shadow: 0 0 12px rgba(0,240,255,0.3);
    }
    .hero .subtitle {
      font-size: 1.3rem;
      color: #cbd5e0;
      margin-bottom: 2.5rem;
      max-width: 600px;
    }
    .hero-actions {
      display: flex;
      gap: 1.2rem;
      flex-wrap: wrap;
    }
    .scroll-indicator {
      position: absolute;
      bottom: 30px;
      left: 50%;
      transform: translateX(-50%);
      color: var(--cyan);
      font-size: 2rem;
      animation: pulse 2s infinite;
    }
    @keyframes pulse {
      0% { opacity: 0.4; transform: translateX(-50%) translateY(0); }
      50% { opacity: 1; transform: translateX(-50%) translateY(8px); }
      100% { opacity: 0.4; transform: translateX(-50%) translateY(0); }
    }

    /* 板块通用 */
    section {
      padding: 90px 0;
    }
    .section-title {
      font-size: 2.4rem;
      font-weight: 700;
      color: var(--white);
      margin-bottom: 1rem;
      letter-spacing: -0.3px;
    }
    .section-sub {
      color: #a0aec0;
      font-size: 1.15rem;
      margin-bottom: 3rem;
    }

    /* 痛点区 */
    .pain-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .pain-card {
      background: #1a1f3a;
      border: 1px solid rgba(255,70,85,0.25);
      border-radius: var(--radius-card);
      padding: 2rem;
      transition: var(--transition);
    }
    .pain-card i {
      color: var(--red);
      font-size: 2rem;
      margin-bottom: 1rem;
    }
    .pain-card h3 {
      color: var(--white);
      font-weight: 700;
      margin-bottom: 0.8rem;
    }

    /* 解决方案优势 */
    .advantage-row {
      display: flex;
      gap: 40px;
      align-items: center;
      margin-bottom: 70px;
    }
    .advantage-row.reverse {
      flex-direction: row-reverse;
    }
    .adv-text {
      flex: 1;
    }
    .adv-image {
      flex: 1;
      border-radius: 20px;
      overflow: hidden;
      background: #1a1f3a;
    }
    .adv-image img {
      width: 100%;
      height: auto;
      display: block;
    }
    .adv-text h3 {
      font-size: 2rem;
      font-weight: 700;
      color: var(--white);
      margin-bottom: 1.2rem;
    }
    .highlight {
      color: var(--cyan);
    }

    /* 数据大数字 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 30px;
      text-align: center;
    }
    .stat-item {
      background: #131832;
      border-radius: 20px;
      padding: 2rem 1rem;
      border: 1px solid var(--border-subtle);
    }
    .stat-number {
      font-size: 3rem;
      font-weight: 800;
      color: var(--cyan);
    }
    .stat-label {
      color: #b0b8d0;
      font-weight: 500;
    }

    /* 证言 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 28px;
    }
    .testimonial-card {
      background: #f0f2f8;
      color: var(--text-primary-light);
      border-radius: 20px;
      padding: 2rem;
      box-shadow: 0 10px 20px rgba(0,0,0,0.1);
    }
    .testimonial-card i {
      color: var(--cyan);
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      background: #131832;
      border-radius: 14px;
      margin-bottom: 16px;
      border: 1px solid var(--border-subtle);
    }
    .faq-question {
      padding: 1.4rem 2rem;
      font-weight: 700;
      color: var(--white);
      display: flex;
      justify-content: space-between;
      cursor: pointer;
    }
    .faq-answer {
      padding: 0 2rem 1.5rem;
      color: #b0b8d0;
      display: none;
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    .faq-item.active .faq-question i {
      transform: rotate(45deg);
    }

    /* CTA 横幅 */
    .cta-band {
      background: linear-gradient(45deg, #0A0E27, #1a2a4a);
      border-top: 1px solid var(--cyan);
      border-bottom: 1px solid var(--cyan);
    }

    /* 页脚 */
    .footer {
      background: #060916;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
    }
    .footer a {
      color: #b0b8d0;
      text-decoration: none;
    }
    .copyright {
      border-top: 1px solid rgba(255,255,255,0.1);
      margin-top: 40px;
      padding-top: 20px;
      text-align: center;
      color: #6b7280;
    }

    @media (max-width: 1024px) {
      .pain-grid, .testimonial-grid { grid-template-columns: repeat(2,1fr); }
      .stats-grid { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .menu-toggle { display: block; }
      .hero h1 { font-size: 2.3rem; }
      .advantage-row { flex-direction: column; }
      .advantage-row.reverse { flex-direction: column; }
      .pain-grid, .testimonial-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
    }