/* roulang page: index */
:root {
      --green-deep: #0B3B2F;
      --green-neon: #C8FF00;
      --warm-white: #F7F6F2;
      --text-dark: #1E1E1E;
      --text-mid: #5C5C5C;
      --yellow-ref: #FFD100;
      --card-bg: #FFFFFF;
      --border-light: #E8E6E1;
      --shadow-sm: 0 2px 8px rgba(0,0,0,0.04);
      --shadow-hover: 0 8px 30px rgba(0,0,0,0.06);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-img: 8px;
      --radius-hero: 16px;
      --container-max: 1280px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", sans-serif;
      --font-number: "Inter", "SF Pro Display", system-ui, -apple-system;
      --transition-smooth: 0.3s cubic-bezier(0.23, 1, 0.32, 1);
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--warm-white);
      color: var(--text-dark);
      line-height: 1.7;
      font-size: 17px;
      font-weight: 400;
      -webkit-font-smoothing: antialiased;
      scroll-behavior: smooth;
      overflow-x: hidden;
    }
    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }
    @media (max-width: 768px) {
      .container {
        padding: 0 16px;
      }
      body {
        font-size: 16px;
      }
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
      border-radius: var(--radius-img);
    }
    a {
      color: var(--green-deep);
      text-decoration: none;
      transition: border 0.2s;
      border-bottom: 1px solid transparent;
    }
    a:hover {
      border-bottom: 2px solid var(--green-deep);
    }
    h1, h2, h3, h4 {
      font-weight: 600;
      line-height: 1.25;
      color: var(--text-dark);
    }
    h1 {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.15;
    }
    h2 {
      font-size: 36px;
      letter-spacing: -0.5px;
    }
    h3 {
      font-size: 22px;
      font-weight: 600;
      line-height: 1.35;
    }
    @media (max-width: 768px) {
      h1 { font-size: 36px; }
      h2 { font-size: 28px; }
      h3 { font-size: 20px; }
    }
    button, .btn {
      cursor: pointer;
      font-family: var(--font-sans);
      transition: var(--transition-smooth);
      border: none;
      outline: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
      padding: 12px 28px;
      letter-spacing: 0.3px;
      text-decoration: none;
      white-space: nowrap;
    }
    .btn-primary {
      background: var(--green-deep);
      color: white;
      border: 2px solid var(--green-deep);
    }
    .btn-primary:hover {
      background: #084A3A;
      border-color: #084A3A;
    }
    .btn-primary:active {
      transform: scale(0.97);
    }
    .btn-outline {
      background: transparent;
      color: var(--green-deep);
      border: 1.5px solid var(--green-deep);
    }
    .btn-outline:hover {
      background: var(--green-deep);
      color: white;
    }
    .btn-cta-glow {
      background: var(--green-neon);
      color: var(--green-deep);
      border: 2px solid var(--green-neon);
      font-weight: 700;
      box-shadow: 0 0 12px rgba(200,255,0,0.25);
    }
    .btn-cta-glow:hover {
      background: #D9FF33;
      border-color: #D9FF33;
      box-shadow: 0 0 20px rgba(200,255,0,0.4);
    }
    .section {
      padding: 120px 0;
    }
    @media (max-width: 768px) {
      .section {
        padding: 80px 0;
      }
    }
    /* 导航 */
    .nav-bar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      z-index: 1000;
      transition: background 0.3s, box-shadow 0.3s;
      border-bottom: 1px solid transparent;
    }
    .nav-bar.scrolled {
      background: rgba(255,255,255,0.97);
      box-shadow: 0 2px 20px rgba(0,0,0,0.05);
      border-bottom: 1px solid var(--border-light);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
      height: 72px;
    }
    .logo {
      font-size: 22px;
      font-weight: 700;
      color: var(--green-deep);
      display: flex;
      align-items: center;
      gap: 8px;
      border-bottom: none;
      letter-spacing: -0.2px;
    }
    .logo svg {
      width: 32px;
      height: 32px;
      fill: var(--green-deep);
    }
    .nav-links {
      display: flex;
      gap: 40px;
      list-style: none;
    }
    .nav-links a {
      font-size: 16px;
      color: #1E1E1E;
      border-bottom: none;
      font-weight: 500;
      padding-bottom: 6px;
      transition: color 0.2s;
    }
    .nav-links a:hover {
      color: var(--green-neon);
      border-bottom: 3px solid var(--green-neon);
    }
    .nav-cta {
      background: var(--green-neon);
      color: var(--green-deep);
      padding: 10px 24px;
      border-radius: 40px;
      font-weight: 700;
      border: none;
      font-size: 15px;
      letter-spacing: 0.4px;
      border-bottom: none;
    }
    .nav-cta:hover {
      background: #D9FF33;
      border-bottom: none;
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: transparent;
      border: none;
      cursor: pointer;
    }
    .hamburger span {
      width: 25px;
      height: 2.5px;
      background: var(--green-deep);
      border-radius: 4px;
      transition: 0.3s;
    }
    @media (max-width: 768px) {
      .nav-links, .nav-cta-desktop {
        display: none;
      }
      .hamburger {
        display: flex;
      }
    }
    .mobile-menu {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: var(--green-deep);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 32px;
      transform: translateX(100%);
      transition: transform 0.4s ease;
      z-index: 2000;
    }
    .mobile-menu.active {
      transform: translateX(0);
    }
    .mobile-menu a {
      color: white;
      font-size: 22px;
      border-bottom: none;
      font-weight: 500;
    }
    .close-menu {
      position: absolute;
      top: 24px;
      right: 24px;
      background: transparent;
      color: white;
      font-size: 32px;
      border: none;
    }
    /* Hero */
    .hero-grid {
      display: grid;
      grid-template-columns: 5fr 7fr;
      gap: 48px;
      align-items: center;
      min-height: 85vh;
      padding-top: 72px;
    }
    .hero-content {
      display: flex;
      flex-direction: column;
      gap: 24px;
    }
    .hero-badge {
      display: flex;
      gap: 24px;
      margin-top: 12px;
      color: var(--text-mid);
      font-size: 14px;
      border-top: 1px solid var(--border-light);
      padding-top: 20px;
    }
    .hero-image {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: var(--radius-hero);
      min-height: 420px;
      width: 100%;
    }
    @media (max-width: 1024px) {
      .hero-grid {
        grid-template-columns: 1fr 1fr;
        gap: 32px;
      }
    }
    @media (max-width: 768px) {
      .hero-grid {
        grid-template-columns: 1fr;
        text-align: center;
        min-height: auto;
        padding-bottom: 40px;
      }
      .hero-image {
        order: -1;
        min-height: 300px;
      }
      .hero-badge {
        justify-content: center;
        flex-wrap: wrap;
      }
    }
    /* 功能错落卡片 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
      margin-top: 40px;
    }
    .feature-card {
      background: var(--card-bg);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-card);
      padding: 32px;
      transition: var(--transition-smooth);
      position: relative;
      border-left: 4px solid var(--green-neon);
      box-shadow: var(--shadow-sm);
    }
    .feature-card:nth-child(1) { transform: translateY(-20px); }
    .feature-card:nth-child(3) { transform: translateY(20px); }
    .feature-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    @media (max-width: 768px) {
      .features-grid {
        grid-template-columns: 1fr;
        gap: 24px;
      }
      .feature-card:nth-child(1), .feature-card:nth-child(3) {
        transform: none;
      }
    }
    /* 场景2x2 */
    .scenarios-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
    }
    .scenario-card {
      display: flex;
      gap: 24px;
      background: white;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-card);
      overflow: hidden;
      transition: var(--transition-smooth);
    }
    .scenario-img {
      width: 40%;
      background-size: cover;
      background-position: center;
      min-height: 180px;
    }
    @media (max-width: 768px) {
      .scenarios-grid {
        grid-template-columns: 1fr;
      }
    }
    /* 案例杂志风 */
    .case-row {
      display: flex;
      align-items: center;
      gap: 56px;
      margin: 48px 0;
    }
    .case-number {
      font-size: 64px;
      font-weight: 800;
      color: var(--green-neon);
      text-shadow: 0 2px 8px rgba(0,0,0,0.04);
      font-family: var(--font-number);
    }
    @media (max-width: 768px) {
      .case-row {
        flex-direction: column;
        gap: 20px;
      }
    }
    /* 价格卡片 */
    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }
    .pricing-card {
      background: white;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-card);
      padding: 32px;
      transition: var(--transition-smooth);
    }
    .pricing-card.featured {
      border: 2px solid var(--green-neon);
      background: #F7F6F2;
      transform: translateY(-8px);
    }
    @media (max-width: 768px) {
      .pricing-grid {
        grid-template-columns: 1fr;
      }
    }
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 20px 0;
      cursor: pointer;
    }
    .faq-question {
      font-weight: 600;
      display: flex;
      justify-content: space-between;
    }
    /* CTA深色条 */
    .cta-dark {
      background: var(--green-deep);
      color: white;
      text-align: center;
      padding: 80px 0;
    }
    footer {
      background: #1E1E1E;
      color: #B0B0B0;
      padding: 60px 0 30px;
    }
    @media (max-width: 768px) {
      .hide-mobile {
        display: none;
      }
    }