/* roulang page: index */
:root {
      --primary-deep: #0A0E27;
      --primary-dark: #0F1535;
      --gold: #F4B41A;
      --cyan: #00F0FF;
      --white: #FFFFFF;
      --gray-light: #F8F9FA;
      --gray-mid: #CED4DA;
      --gray-text: #6C757D;
      --shadow-card: 0 12px 30px rgba(0, 0, 0, 0.25);
      --shadow-gold: 0 6px 20px rgba(244, 180, 26, 0.35);
      --radius-lg: 18px;
      --radius-pill: 50px;
      --radius-md: 12px;
      --transition: 0.3s cubic-bezier(0.23, 1, 0.32, 1);
    }

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

    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", "Inter", sans-serif;
      background-color: var(--primary-deep);
      color: var(--gray-mid);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      width: 90%;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 20px;
    }

    /* 导航 */
    .nav-bar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(10, 14, 39, 0.88);
      backdrop-filter: blur(18px);
      -webkit-backdrop-filter: blur(18px);
      border-bottom: 1px solid rgba(244, 180, 26, 0.3);
      z-index: 1000;
      transition: var(--transition);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
      width: 90%;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 10px;
    }

    .logo {
      font-weight: 700;
      font-size: 1.8rem;
      letter-spacing: 2px;
      color: var(--white);
      text-decoration: none;
      display: flex;
      align-items: center;
    }
    .logo span {
      color: var(--gold);
      margin-left: 4px;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 2.5rem;
    }

    .nav-links a {
      color: var(--gray-mid);
      text-decoration: none;
      font-weight: 500;
      font-size: 1rem;
      transition: color var(--transition);
      position: relative;
    }
    .nav-links a:hover {
      color: var(--gold);
    }

    .nav-cta {
      background: linear-gradient(135deg, #F4B41A 0%, #FF8C00 100%);
      color: #0A0E27 !important;
      padding: 0.7rem 2rem;
      border-radius: var(--radius-pill);
      font-weight: 700;
      box-shadow: var(--shadow-gold);
      transition: all var(--transition);
      border: none;
      cursor: pointer;
    }
    .nav-cta:hover {
      filter: brightness(1.1);
      box-shadow: 0 8px 28px rgba(244, 180, 26, 0.55);
      transform: translateY(-2px);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: transparent;
      border: none;
    }
    .hamburger span {
      width: 28px;
      height: 3px;
      background: var(--gold);
      border-radius: 2px;
      transition: 0.3s;
    }

    @media (max-width: 768px) {
      .nav-links {
        position: fixed;
        top: 72px;
        left: 0;
        width: 100%;
        background: rgba(10, 14, 39, 0.96);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 2.5rem;
        gap: 2rem;
        transform: translateY(-150%);
        transition: transform 0.4s ease;
        border-bottom: 1px solid var(--gold);
      }
      .nav-links.active {
        transform: translateY(0);
      }
      .hamburger {
        display: flex;
      }
    }

    /* 通用板块 */
    section {
      padding: 6rem 0;
    }
    @media (max-width: 768px) {
      section {
        padding: 4rem 0;
      }
    }

    h2 {
      font-weight: 700;
      font-size: 2.8rem;
      color: var(--white);
      margin-bottom: 1.8rem;
      position: relative;
      display: inline-block;
    }
    h2::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: -12px;
      width: 70px;
      height: 4px;
      background: var(--gold);
      border-radius: 2px;
    }

    .section-intro {
      font-size: 1.25rem;
      color: var(--gray-mid);
      margin-bottom: 3.5rem;
    }

    /* Hero */
    .hero {
      padding-top: 140px;
      padding-bottom: 5rem;
      display: flex;
      align-items: center;
      background-image: radial-gradient(circle at 20% 30%, rgba(0,240,255,0.08) 0%, transparent 50%);
    }
    .hero-grid {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 3rem;
    }
    .hero-left {
      flex: 1 1 55%;
    }
    .hero-right {
      flex: 1 1 40%;
      display: flex;
      justify-content: center;
      align-items: center;
    }
    .hero-right img {
      max-width: 100%;
      height: auto;
      border-radius: var(--radius-lg);
      filter: drop-shadow(0 0 35px rgba(0,240,255,0.3));
    }
    h1 {
      font-weight: 700;
      font-size: 3.5rem;
      letter-spacing: 2px;
      color: var(--white);
      line-height: 1.2;
      margin-bottom: 1.8rem;
    }
    h1 .highlight {
      color: var(--gold);
    }
    .hero-sub {
      font-size: 1.3rem;
      color: var(--gray-mid);
      margin-bottom: 2.5rem;
      max-width: 500px;
    }
    .btn-group {
      display: flex;
      flex-wrap: wrap;
      gap: 1.2rem;
    }
    .btn-primary {
      background: linear-gradient(135deg, #F4B41A 0%, #FF8C00 100%);
      border: none;
      color: #0A0E27;
      font-weight: 700;
      padding: 1rem 2.4rem;
      border-radius: var(--radius-pill);
      cursor: pointer;
      box-shadow: 0 6px 22px rgba(244,180,26,0.45);
      transition: all var(--transition);
      text-decoration: none;
      display: inline-block;
      font-size: 1rem;
    }
    .btn-primary:hover {
      filter: brightness(1.1);
      transform: translateY(-2px);
    }
    .btn-secondary {
      background: transparent;
      border: 2px solid var(--cyan);
      color: var(--cyan);
      font-weight: 600;
      padding: 1rem 2.4rem;
      border-radius: var(--radius-pill);
      cursor: pointer;
      transition: all var(--transition);
      text-decoration: none;
      display: inline-block;
      font-size: 1rem;
    }
    .btn-secondary:hover {
      background: rgba(0,240,255,0.08);
    }

    @media (max-width: 768px) {
      h1 {
        font-size: 2.6rem;
      }
    }

    /* 痛点 */
    .pain-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
      gap: 2rem;
    }
    .pain-card {
      background: rgba(255,255,255,0.04);
      backdrop-filter: blur(8px);
      padding: 2rem;
      border-radius: var(--radius-md);
      border-left: 5px solid var(--gold);
      transition: var(--transition);
    }
    .pain-card i {
      font-size: 2rem;
      color: var(--cyan);
      margin-bottom: 1.3rem;
    }
    .pain-card h3 {
      color: var(--white);
      font-weight: 600;
      font-size: 1.4rem;
      margin-bottom: 0.8rem;
    }

    /* 解决方案 1+2 不对称 */
    .solution-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 2rem;
    }
    .big-card {
      background: linear-gradient(145deg, rgba(244,180,26,0.12) 0%, transparent 70%);
      border: 1px solid rgba(244,180,26,0.25);
      border-radius: var(--radius-lg);
      padding: 2.5rem;
      display: flex;
      flex-direction: column;
      justify-content: center;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
      overflow: hidden;
    }
    .big-card::before {
      content: '';
      position: absolute;
      inset: 0;
      background: rgba(10,14,27,0.7);
    }
    .big-card * {
      position: relative;
      z-index: 2;
    }
    .small-stack {
      display: flex;
      flex-direction: column;
      gap: 1.5rem;
    }
    .small-card {
      background: #FFFFFF;
      border-radius: var(--radius-md);
      padding: 2rem;
      border-left: 6px solid var(--cyan);
      color: #0A0E27;
      box-shadow: var(--shadow-card);
    }
    .small-card h3 {
      color: #0A0E27;
    }

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

    /* 成果数据 */
    .stats-grid {
      display: flex;
      flex-wrap: wrap;
      justify-content: space-around;
      text-align: center;
      gap: 2rem;
      background: var(--primary-dark);
      border-radius: var(--radius-lg);
      padding: 3rem 2rem;
    }
    .stat-item h3 {
      font-size: 3.2rem;
      font-weight: 700;
      color: var(--cyan);
    }

    /* 证言 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 2rem;
    }
    .testimonial-card {
      background: #FFFFFF;
      padding: 2.2rem;
      border-radius: var(--radius-md);
      color: #2d2d2d;
      box-shadow: 0 10px 25px rgba(0,0,0,0.15);
      position: relative;
    }
    .testimonial-card i.fa-quote-left {
      color: rgba(244,180,26,0.3);
      font-size: 2.5rem;
      position: absolute;
      top: 15px;
      left: 20px;
    }

    /* FAQ */
    .faq-item {
      background: rgba(255,255,255,0.04);
      border-radius: var(--radius-md);
      margin-bottom: 1rem;
      overflow: hidden;
    }
    .faq-question {
      padding: 1.5rem;
      font-weight: 600;
      color: var(--white);
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      background: rgba(255,255,255,0.05);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      background: rgba(255,255,255,0.02);
      color: var(--gray-mid);
      padding: 0 1.5rem;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 1.5rem;
    }

    /* 终极CTA */
    .cta-section {
      background: linear-gradient(135deg, #F4B41A 0%, #0A0E27 80%);
      border-radius: var(--radius-lg);
      padding: 4rem 2rem;
      text-align: center;
    }
    .cta-form {
      display: flex;
      flex-wrap: wrap;
      gap: 1rem;
      justify-content: center;
      margin-top: 2rem;
    }
    .cta-form input, .cta-form textarea {
      background: rgba(255,255,255,0.1);
      border: 1px solid rgba(255,255,255,0.25);
      border-radius: 8px;
      padding: 1rem;
      color: white;
      width: 220px;
    }
    .cta-form input:focus {
      border-color: var(--cyan);
    }
    .btn-submit {
      background: #0A0E27;
      color: var(--gold);
      font-weight: bold;
      border: none;
      padding: 1rem 2.2rem;
      border-radius: var(--radius-pill);
    }

    footer {
      background: #050816;
      padding: 3rem 0;
      color: var(--gray-text);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(180px,1fr));
      gap: 2rem;
    }
    .footer-logo {
      font-size: 1.6rem;
      color: white;
    }