/* roulang page: index */
:root {
      --deep-space: #0B0C10;
      --stardust-gold: #C9A96E;
      --moon-white: #F5F3EF;
      --nebula-gray: #9A9A9A;
      --dark-card: #15171E;
      --gold-border-subtle: rgba(201,169,110,0.15);
      --gold-border-hover: rgba(201,169,110,0.45);
      --gold-glow: rgba(201,169,110,0.2);
      --transition-smooth: 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
      --font-serif: "Noto Serif SC", "Source Han Serif SC", serif;
      --font-ui: "Inter", "SF Pro Text", "PingFang SC", "Microsoft YaHei", sans-serif;
      --font-number: "Inter", "Space Grotesk", sans-serif;
      --max-width: 1200px;
      --section-padding: 100px;
    }
    * { box-sizing: border-box; margin: 0; padding: 0; }
    body {
      font-family: var(--font-ui);
      background-color: var(--deep-space);
      color: var(--moon-white);
      line-height: 1.75;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    img { max-width: 100%; height: auto; display: block; }
    a { text-decoration: none; color: inherit; transition: var(--transition-smooth); }
    .container { max-width: var(--max-width); margin: 0 auto; padding: 0 5vw; }

    /* 导航栏 SaaS 命令栏风格 */
    .stellar-nav {
      position: fixed; top: 0; left: 0; width: 100%; height: 64px;
      background: transparent; z-index: 100;
      display: flex; align-items: center; justify-content: space-between;
      padding: 0 5vw; transition: background 0.3s ease, backdrop-filter 0.3s ease;
    }
    .stellar-nav.scrolled {
      background: rgba(11,12,16,0.92);
      backdrop-filter: blur(12px);
      box-shadow: 0 1px 10px rgba(0,0,0,0.45);
    }
    .nav-logo {
      display: flex; align-items: center; gap: 10px;
      font-family: var(--font-serif); font-size: 1.6rem; font-weight: 600;
      color: var(--stardust-gold); letter-spacing: 0.02em;
    }
    .nav-logo i { font-size: 1.8rem; color: var(--stardust-gold); }
    .nav-links { display: flex; gap: 2rem; align-items: center; }
    .nav-links a {
      font-size: 0.95rem; font-weight: 500; color: var(--moon-white);
      position: relative; padding: 0.25rem 0;
    }
    .nav-links a::after {
      content: ''; position: absolute; bottom: -2px; left: 0; width: 0; height: 2px;
      background: var(--stardust-gold); transition: width 0.25s ease;
    }
    .nav-links a:hover::after, .nav-links a.active::after { width: 100%; }
    .nav-actions { display: flex; align-items: center; gap: 1rem; }
    .search-trigger { background: none; border: none; color: var(--moon-white); font-size: 1.2rem; cursor: pointer; }
    .btn { display: inline-flex; align-items: center; justify-content: center; border-radius: 8px; font-weight: 600; font-size: 0.9rem; letter-spacing: 0.04em; transition: all 0.3s ease; cursor: pointer; border: none; }
    .btn-primary {
      background: linear-gradient(135deg, #C9A96E 0%, #E0B878 100%);
      color: #0B0C10; padding: 12px 28px; box-shadow: 0 4px 12px rgba(201,169,110,0.2);
    }
    .btn-primary:hover { box-shadow: 0 0 20px rgba(201,169,110,0.5); transform: translateY(-1px); }
    .btn-secondary {
      background: transparent; border: 1.5px solid var(--stardust-gold);
      color: var(--stardust-gold); padding: 10px 26px;
    }
    .btn-secondary:hover { background: rgba(201,169,110,0.1); }
    .mobile-menu-btn { display: none; background: none; border: none; color: var(--moon-white); font-size: 1.8rem; }

    /* Hero */
    .hero {
      height: 100vh; min-height: 700px; display: flex; align-items: center;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      position: relative; margin-top: 0;
    }
    .hero::before {
      content: ''; position: absolute; inset: 0;
      background: linear-gradient(to top, #0B0C10 0%, transparent 60%);
    }
    .hero-content { position: relative; z-index: 2; max-width: 700px; margin-left: 5vw; }
    .hero-tag {
      font-size: 0.9rem; letter-spacing: 0.15em; color: var(--stardust-gold);
      text-transform: uppercase; margin-bottom: 1.5rem; font-weight: 500;
    }
    .hero h1 {
      font-family: var(--font-serif); font-size: 3.5rem; line-height: 1.15;
      font-weight: 700; letter-spacing: -0.02em; color: var(--moon-white);
      margin-bottom: 1.5rem;
    }
    .hero-sub {
      font-size: 1.15rem; color: var(--nebula-gray); max-width: 480px;
      margin-bottom: 2.5rem; line-height: 1.7;
    }
    .hero-buttons { display: flex; gap: 1.2rem; flex-wrap: wrap; }
    .star-particle {
      position: absolute; right: 8%; bottom: 15%; width: 120px; height: 120px;
      background: radial-gradient(circle, rgba(201,169,110,0.6) 0%, transparent 70%);
      border-radius: 50%; filter: blur(25px); animation: breathe 3s infinite ease-in-out;
    }
    @keyframes breathe { 0%,100% { opacity: 0.3; transform: scale(1); } 50% { opacity: 0.7; transform: scale(1.08); } }

    section { padding: var(--section-padding) 0; }
    .section-title {
      font-family: var(--font-serif); font-size: 2.4rem; font-weight: 600;
      margin-bottom: 0.75rem; color: var(--moon-white);
    }
    .section-desc { color: var(--nebula-gray); max-width: 600px; margin-bottom: 3rem; }

    /* 价值主张错位 */
    .value-row {
      display: flex; align-items: center; gap: 4rem; margin-bottom: 5rem;
    }
    .value-row.reverse { flex-direction: row-reverse; }
    .value-text { flex: 1; }
    .value-text h3 { font-family: var(--font-serif); font-size: 1.8rem; margin-bottom: 1rem; }
    .gold-line { width: 40px; height: 3px; background: var(--stardust-gold); margin: 1.2rem 0; }
    .value-img { flex: 1; border-radius: 12px; overflow: hidden; box-shadow: 0 10px 25px rgba(0,0,0,0.5); }
    .value-img img { width: 100%; height: auto; object-fit: cover; }

    /* 服务矩阵不对称 */
    .service-grid {
      display: grid; grid-template-columns: 1fr 1fr; gap: 32px;
    }
    .service-card {
      background: var(--dark-card); border: 1px solid var(--gold-border-subtle);
      border-radius: 16px; padding: 38px 32px; transition: all var(--transition-smooth);
      display: flex; flex-direction: column;
    }
    .service-card.tall { padding: 54px 36px; }
    .service-card:hover {
      border-color: var(--gold-border-hover); transform: translateY(-6px);
      box-shadow: 0 12px 28px rgba(201,169,110,0.12);
    }
    .service-icon { font-size: 2.5rem; color: var(--stardust-gold); margin-bottom: 1.5rem; }
    .service-card h3 { font-size: 1.5rem; margin-bottom: 0.8rem; }
    .service-link { margin-top: auto; color: var(--stardust-gold); font-weight: 500; }

    /* 数据带 */
    .data-strip {
      background: #0B0C10; padding: 4rem 0; border-top: 1px solid rgba(201,169,110,0.15);
      border-bottom: 1px solid rgba(201,169,110,0.15);
    }
    .data-items { display: flex; justify-content: space-around; text-align: center; }
    .data-number { font-family: var(--font-number); font-size: 3rem; font-weight: 700; color: var(--stardust-gold); }

    /* 案例叙事 */
    .case-row { display: flex; align-items: center; gap: 3rem; margin-bottom: 4rem; }
    .case-img { flex: 1.2; border-radius: 16px; overflow: hidden; position: relative; }
    .case-img img { transition: transform 0.4s ease; }
    .case-img:hover img { transform: scale(1.03); }
    .case-text { flex: 1; }

    /* 流程时间轴 */
    .timeline { position: relative; padding-left: 40px; }
    .timeline::before { content: ''; position: absolute; left: 8px; top: 0; bottom: 0; width: 2px; background: var(--stardust-gold); }
    .timeline-item { position: relative; margin-bottom: 2.5rem; }
    .timeline-dot { position: absolute; left: -37px; top: 4px; width: 18px; height: 18px; background: var(--deep-space); border: 2px solid var(--stardust-gold); border-radius: 50%; }

    /* FAQ */
    .faq-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem; }
    .accordion-item { border-bottom: 1px solid rgba(201,169,110,0.2); }
    .accordion-title { font-weight: 600; padding: 1rem 0; cursor: pointer; display: flex; justify-content: space-between; }

    /* CTA */
    .cta-section {
      background: #0B0C10; text-align: center; padding: 5rem 0;
      position: relative; overflow: hidden;
    }
    .particle-bg { position: absolute; width: 100%; height: 100%; background: radial-gradient(circle at 30% 30%, rgba(201,169,110,0.05) 0%, transparent 50%); }

    footer { background: #0B0C10; border-top: 1px solid var(--stardust-gold); padding: 3rem 0 1.5rem; }

    @media (max-width: 1024px) {
      .hero h1 { font-size: 2.8rem; }
      .value-row { gap: 2rem; }
    }
    @media (max-width: 768px) {
      .nav-links, .nav-actions .btn { display: none; }
      .mobile-menu-btn { display: block; }
      .service-grid, .faq-grid { grid-template-columns: 1fr; }
      .value-row, .value-row.reverse { flex-direction: column; }
      .data-items { flex-direction: column; gap: 2rem; }
      .case-row { flex-direction: column; }
    }