/* roulang page: index */
/* 设计变量与基础重置 */
    :root {
      --deep-space: #0b0c1e;
      --deep-space-light: #151832;
      --star-gold: #D4AF37;
      --star-gold-dark: #B8960C;
      --platinum-gray: #E8E8E8;
      --text-primary: rgba(255, 255, 255, 0.92);
      --text-secondary: rgba(220, 220, 240, 0.75);
      --text-muted: rgba(180, 180, 200, 0.65);
      --card-bg: rgba(20, 22, 40, 0.7);
      --card-border: rgba(212, 175, 55, 0.2);
      --glass-blur: blur(12px);
      --radius-lg: 24px;
      --radius-md: 16px;
      --radius-sm: 8px;
      --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
      --shadow-glow: 0 0 20px rgba(212, 175, 55, 0.6);
      --font-serif: 'Noto Serif SC', 'Times New Roman', serif;
      --font-sans: 'Inter', '思源黑体', 'Helvetica Neue', system-ui, sans-serif;
      --nav-height: 64px;
    }

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

    html {
      scroll-behavior: smooth;
      background-color: var(--deep-space);
    }

    body {
      font-family: var(--font-sans);
      background: radial-gradient(ellipse at 30% 20%, #151b30 0%, #0b0f1c 70%);
      color: var(--text-primary);
      line-height: 1.7;
      min-height: 100vh;
      -webkit-font-smoothing: antialiased;
      display: flex;
      flex-direction: column;
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.25s, background 0.25s;
    }

    button, input {
      font-family: inherit;
      outline: none;
      border: none;
      background: transparent;
    }

    /* 容器与间距 */
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 40px;
      width: 100%;
    }

    @media (max-width: 768px) {
      .container {
        padding: 0 24px;
      }
    }

    section {
      padding: 100px 0;
      position: relative;
    }

    @media (max-width: 768px) {
      section {
        padding: 70px 0;
      }
    }

    /* 导航 - 分屏联动风格 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      height: var(--nav-height);
      background: rgba(10, 14, 39, 0.85);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-bottom: 1px solid rgba(212, 175, 55, 0.15);
      display: flex;
      align-items: center;
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 40px;
      height: 100%;
    }

    .logo {
      font-family: var(--font-serif);
      font-size: 1.6rem;
      font-weight: 700;
      color: var(--star-gold);
      letter-spacing: 2px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo span {
      background: linear-gradient(135deg, #D4AF37 0%, #F5E7B3 80%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
    }

    .nav-links a {
      font-size: 0.95rem;
      font-weight: 500;
      color: #CCCCCC;
      letter-spacing: 0.5px;
      padding: 6px 0;
      border-bottom: 2px solid transparent;
      transition: 0.2s;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--star-gold);
      border-bottom-color: var(--star-gold);
    }

    .nav-cta {
      background: linear-gradient(135deg, #D4AF37 0%, #B8960C 100%);
      color: #0b0c1e;
      font-weight: 600;
      padding: 10px 22px;
      border-radius: 40px;
      font-size: 0.9rem;
      box-shadow: 0 4px 12px rgba(212,175,55,0.3);
      transition: 0.3s;
    }
    .nav-cta:hover {
      box-shadow: var(--shadow-glow);
      transform: translateY(-1px);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
    }
    .hamburger span {
      width: 26px;
      height: 2px;
      background: #E8E8E8;
      transition: 0.3s;
    }

    @media (max-width: 1024px) {
      .nav-links {
        gap: 20px;
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        position: fixed;
        top: var(--nav-height);
        left: 0;
        width: 100%;
        background: rgba(8, 10, 28, 0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 32px 24px;
        gap: 24px;
        transform: translateY(-120%);
        transition: 0.4s ease;
        border-bottom: 1px solid rgba(212,175,55,0.3);
      }
      .nav-links.active {
        transform: translateY(0);
      }
      .hamburger {
        display: flex;
      }
      .nav-cta.desktop-only {
        display: none;
      }
    }

    /* 首屏 Hero 分屏 */
    .hero {
      display: grid;
      grid-template-columns: 1fr 1fr;
      align-items: center;
      min-height: 100vh;
      padding-top: var(--nav-height);
      gap: 60px;
    }

    .hero-content {
      display: flex;
      flex-direction: column;
      justify-content: center;
    }

    .hero h1 {
      font-family: var(--font-serif);
      font-size: 3.4rem;
      font-weight: 700;
      line-height: 1.3;
      color: white;
      margin-bottom: 24px;
      letter-spacing: 1px;
    }
    .hero h1 .gold-highlight {
      color: var(--star-gold);
      position: relative;
    }
    .hero h1 .gold-underline {
      border-bottom: 3px solid var(--star-gold);
      padding-bottom: 4px;
    }

    .hero-sub {
      font-size: 1.2rem;
      color: var(--text-secondary);
      margin-bottom: 40px;
      max-width: 480px;
    }

    .hero-actions {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: linear-gradient(135deg, #D4AF37, #B8960C);
      color: #0b0c1e;
      font-weight: 700;
      padding: 14px 36px;
      border-radius: 40px;
      font-size: 1rem;
      box-shadow: 0 6px 18px rgba(212,175,55,0.4);
      transition: 0.3s;
      letter-spacing: 0.8px;
    }
    .btn-primary:hover {
      box-shadow: 0 0 24px rgba(212,175,55,0.8);
      transform: translateY(-2px);
    }

    .btn-outline {
      border: 1px solid rgba(255,255,255,0.5);
      color: white;
      padding: 14px 36px;
      border-radius: 40px;
      font-weight: 500;
      backdrop-filter: blur(4px);
      transition: 0.3s;
    }
    .btn-outline:hover {
      background: rgba(212,175,55,0.15);
      border-color: var(--star-gold);
      color: var(--star-gold);
    }

    .hero-visual {
      position: relative;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .hero-img-bg {
      width: 100%;
      height: 500px;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      border-radius: 32px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.6);
      position: relative;
      overflow: hidden;
    }

    @media (max-width: 1024px) {
      .hero {
        gap: 40px;
      }
      .hero h1 {
        font-size: 2.6rem;
      }
    }

    @media (max-width: 768px) {
      .hero {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 40px;
      }
      .hero-content {
        order: 1;
      }
      .hero-visual {
        order: 0;
      }
      .hero-img-bg {
        height: 320px;
        margin-top: 20px;
      }
      .hero-sub {
        max-width: 100%;
      }
      .hero-actions {
        justify-content: center;
      }
    }

    /* 通用卡片与板块标题 */
    .section-title {
      font-family: var(--font-serif);
      font-size: 2.4rem;
      font-weight: 700;
      margin-bottom: 16px;
      color: white;
    }
    .section-desc {
      color: var(--text-secondary);
      font-size: 1.1rem;
      margin-bottom: 48px;
    }

    .glass-card {
      background: rgba(20, 22, 40, 0.7);
      backdrop-filter: var(--glass-blur);
      -webkit-backdrop-filter: var(--glass-blur);
      border: 1px solid rgba(212, 175, 55, 0.2);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-card);
      padding: 32px;
    }

    /* 核心优势 非对称网格 */
    .features-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr;
      gap: 28px;
    }
    .feature-large {
      grid-row: span 2;
    }
    .feature-item {
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .feature-icon {
      font-size: 2rem;
      color: var(--star-gold);
    }
    .feature-item h3 {
      font-family: var(--font-serif);
      font-size: 1.5rem;
      font-weight: 600;
    }
    .feature-item p {
      color: var(--text-secondary);
    }

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

    /* 场景卡片 */
    .scenarios-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .scenario-card img {
      border-radius: 12px;
      height: 200px;
      object-fit: cover;
      width: 100%;
    }
    .scenario-card h4 {
      font-family: var(--font-serif);
      margin: 16px 0 8px;
    }

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

    /* 案例混合 */
    .cases-block {
      display: grid;
      grid-template-columns: 1fr 1.2fr;
      gap: 40px;
    }
    .kpi-numbers {
      display: flex;
      flex-direction: column;
      gap: 32px;
    }
    .kpi {
      font-size: 2.6rem;
      font-weight: 700;
      color: var(--star-gold);
    }
    .case-card {
      display: flex;
      align-items: center;
      gap: 20px;
    }

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

    /* 价格卡片 */
    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .pricing-card.featured {
      border-color: var(--star-gold);
      box-shadow: 0 0 28px rgba(212,175,55,0.35);
    }
    .price {
      font-size: 2.2rem;
      font-weight: 700;
      color: var(--star-gold);
    }

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

    /* FAQ 手风琴 */
    .faq-item {
      border-bottom: 1px solid rgba(212,175,55,0.25);
      padding: 20px 0;
      cursor: pointer;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      font-weight: 600;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-secondary);
    }

    /* 最终 CTA */
    .cta-banner {
      background: rgba(11, 12, 30, 0.9);
      backdrop-filter: blur(8px);
      text-align: center;
      padding: 80px 20px;
      border-radius: 32px;
    }

    /* 页脚 */
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      padding: 60px 0 30px;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }