/* roulang page: index */
:root {
      --deep-midnight: #0B0F1C;
      --champagne-gold: #D4AF37;
      --dark-violet: #2D1B4E;
      --pure-black: #000000;
      --bg-gradient-start: #0A0E17;
      --glass-bg: rgba(255, 255, 255, 0.03);
      --glass-border: rgba(255, 255, 255, 0.08);
      --text-white: #FFFFFF;
      --text-light-gray: #B0B8C8;
      --text-gold: #D4AF37;
      --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
      --shadow-hover: 0 16px 48px rgba(0, 0, 0, 0.6);
      --radius-card: 16px;
      --radius-btn: 8px;
      --radius-pill: 50px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Inter", sans-serif;
      --transition-smooth: all 0.25s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    }

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

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: var(--font-sans);
      background: radial-gradient(circle at 20% 10%, #0B0F1C 0%, #000000 90%);
      color: var(--text-white);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      min-height: 100vh;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 顶部信息条 */
    .top-bar {
      background: #05080F;
      height: 36px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      font-size: 0.8rem;
      color: var(--text-light-gray);
      border-bottom: 1px solid rgba(255,255,255,0.05);
      padding: 0 24px;
    }
    .top-bar .domain {
      letter-spacing: 0.5px;
    }
    .top-bar .marquee {
      overflow: hidden;
      white-space: nowrap;
      flex: 1;
      margin: 0 20px;
      color: var(--champagne-gold);
      font-weight: 500;
      text-align: center;
    }
    .top-bar .register-btn {
      background: transparent;
      border: 1px solid var(--champagne-gold);
      color: var(--champagne-gold);
      padding: 4px 16px;
      border-radius: 20px;
      font-size: 0.75rem;
      font-weight: 600;
      cursor: pointer;
      transition: var(--transition-smooth);
      text-decoration: none;
    }
    .top-bar .register-btn:hover {
      background: var(--champagne-gold);
      color: #000;
      box-shadow: 0 0 12px rgba(212,175,55,0.4);
    }

    /* 主导航 */
    .main-header {
      background: rgba(8, 12, 20, 0.75);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(255,255,255,0.06);
      position: sticky;
      top: 0;
      z-index: 50;
      height: 72px;
      display: flex;
      align-items: center;
    }
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    .logo {
      font-size: 1.8rem;
      font-weight: 700;
      background: linear-gradient(135deg, #D4AF37 0%, #FFDF73 80%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      letter-spacing: 2px;
      text-decoration: none;
    }
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
    }
    .nav-menu a {
      color: var(--text-white);
      text-decoration: none;
      font-weight: 500;
      font-size: 1rem;
      position: relative;
      padding: 8px 0;
      transition: color 0.2s;
    }
    .nav-menu a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--champagne-gold);
      transition: width 0.3s;
    }
    .nav-menu a:hover {
      color: var(--champagne-gold);
    }
    .nav-menu a:hover::after {
      width: 100%;
    }
    .nav-cta {
      background: linear-gradient(145deg, #D4AF37, #B4942E);
      border: none;
      color: #0B0F1C;
      font-weight: 700;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      cursor: pointer;
      box-shadow: 0 0 18px rgba(212,175,55,0.5);
      transition: var(--transition-smooth);
      text-decoration: none;
      font-size: 0.95rem;
      letter-spacing: 0.5px;
    }
    .nav-cta:hover {
      box-shadow: 0 0 30px rgba(212,175,55,0.8);
      transform: translateY(-1px);
    }
    .hamburger {
      display: none;
      font-size: 1.8rem;
      cursor: pointer;
      color: var(--text-white);
    }

    /* Hero */
    .hero {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 80px 0 100px;
      gap: 40px;
      position: relative;
      overflow: hidden;
    }
    .hero-left {
      flex: 1 1 55%;
    }
    .hero-left h1 {
      font-size: clamp(2.8rem, 5vw, 3.8rem);
      font-weight: 700;
      letter-spacing: 2px;
      background: linear-gradient(to right, #D4AF37, #FFE68A, #D4AF37);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      margin-bottom: 24px;
      line-height: 1.2;
    }
    .hero-sub {
      font-size: 1.2rem;
      color: var(--text-light-gray);
      margin-bottom: 40px;
      max-width: 480px;
    }
    .hero-buttons {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }
    .btn-glow {
      background: linear-gradient(135deg, #D4AF37, #E5C158);
      border: none;
      color: #0B0F1C;
      font-weight: 700;
      padding: 16px 36px;
      border-radius: var(--radius-btn);
      box-shadow: 0 0 25px rgba(212,175,55,0.6);
      cursor: pointer;
      transition: var(--transition-smooth);
      font-size: 1.1rem;
      text-decoration: none;
      display: inline-block;
      letter-spacing: 1px;
    }
    .btn-glow:hover {
      box-shadow: 0 0 40px rgba(212,175,55,0.9);
      transform: translateY(-3px);
    }
    .btn-outline {
      background: transparent;
      border: 1px solid rgba(255,255,255,0.5);
      color: white;
      padding: 16px 36px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: var(--transition-smooth);
      text-decoration: none;
    }
    .btn-outline:hover {
      border-color: var(--champagne-gold);
      color: var(--champagne-gold);
      background: rgba(212,175,55,0.08);
    }
    .hero-right {
      flex: 1 1 45%;
      display: flex;
      justify-content: center;
      align-items: center;
    }
    .hero-card {
      background: rgba(255,255,255,0.03);
      backdrop-filter: blur(24px);
      -webkit-backdrop-filter: blur(24px);
      border: 1px solid rgba(212,175,55,0.25);
      border-radius: 32px;
      padding: 40px;
      box-shadow: 0 20px 50px rgba(0,0,0,0.7), 0 0 30px rgba(212,175,55,0.3);
      text-align: center;
      width: 100%;
      max-width: 400px;
      transition: transform 0.4s;
    }
    .hero-card:hover {
      transform: scale(1.02);
    }
    .hero-card img {
      width: 100%;
      border-radius: 20px;
      margin-bottom: 20px;
      filter: drop-shadow(0 0 12px rgba(212,175,55,0.4));
    }
    .golden-number {
      font-size: 4rem;
      font-weight: 800;
      color: var(--champagne-gold);
      text-shadow: 0 0 20px rgba(212,175,55,0.7);
    }

    .section {
      padding: 100px 0;
    }
    .section-title {
      font-size: 2.5rem;
      font-weight: 600;
      text-align: center;
      color: white;
      margin-bottom: 12px;
    }
    .title-decoration {
      width: 60px;
      height: 3px;
      background: var(--champagne-gold);
      margin: 0 auto 50px;
      box-shadow: 0 0 12px rgba(212,175,55,0.6);
    }

    /* 亮点网格 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-card);
      padding: 32px 28px;
      transition: var(--transition-smooth);
      box-shadow: var(--shadow-card);
    }
    .glass-card:hover {
      border-color: rgba(212,175,55,0.35);
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover), 0 0 28px rgba(212,175,55,0.3);
    }
    .card-icon {
      font-size: 2.2rem;
      color: var(--champagne-gold);
      margin-bottom: 20px;
    }
    .glass-card h3 {
      font-size: 1.5rem;
      font-weight: 600;
      margin-bottom: 12px;
    }
    .glass-card p {
      color: var(--text-light-gray);
      font-size: 1rem;
    }

    /* 案例瀑布 */
    .masonry {
      columns: 3;
      column-gap: 24px;
    }
    .masonry-item {
      break-inside: avoid;
      margin-bottom: 24px;
      background: rgba(255,255,255,0.02);
      backdrop-filter: blur(16px);
      border: 1px solid rgba(255,255,255,0.06);
      border-radius: 20px;
      overflow: hidden;
      transition: var(--transition-smooth);
    }
    .masonry-item:hover {
      border-color: rgba(212,175,55,0.4);
    }
    .masonry-item img {
      width: 100%;
      display: block;
      border-bottom: 1px solid rgba(212,175,55,0.2);
    }
    .masonry-content {
      padding: 20px;
    }
    .masonry-content h4 {
      font-weight: 600;
      margin-bottom: 8px;
    }
    .tag {
      color: var(--champagne-gold);
      font-size: 0.8rem;
      font-weight: 600;
      border: 1px solid rgba(212,175,55,0.3);
      padding: 2px 10px;
      border-radius: 20px;
      display: inline-block;
      margin-top: 8px;
    }

    /* 方案对比 */
    .compare-grid {
      display: flex;
      gap: 20px;
      justify-content: center;
      align-items: center;
      flex-wrap: wrap;
    }
    .plan-card {
      background: rgba(20, 25, 40, 0.7);
      backdrop-filter: blur(20px);
      border: 1px solid rgba(255,255,255,0.08);
      border-radius: 24px;
      padding: 40px 24px;
      flex: 1;
      min-width: 250px;
      position: relative;
      transition: var(--transition-smooth);
    }
    .plan-card.recommended {
      border: 1px solid var(--champagne-gold);
      box-shadow: 0 0 35px rgba(212,175,55,0.4);
      transform: scale(1.04);
      background: rgba(212,175,55,0.05);
    }
    .badge {
      position: absolute;
      top: -12px;
      right: 20px;
      background: var(--champagne-gold);
      color: #000;
      padding: 5px 18px;
      border-radius: 20px;
      font-weight: 700;
      font-size: 0.8rem;
    }
    .plan-price {
      font-size: 2.5rem;
      color: var(--champagne-gold);
      font-weight: 700;
    }
    .plan-list {
      list-style: none;
      margin: 20px 0;
    }
    .plan-list li {
      padding: 8px 0;
      color: var(--text-light-gray);
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.08);
      padding: 18px 0;
      cursor: pointer;
    }
    .faq-question {
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-light-gray);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-top: 12px;
    }

    .cta-full {
      background: radial-gradient(circle at center, #1A1333 0%, #000 90%);
      text-align: center;
      padding: 100px 20px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      padding: 60px 0;
    }
    @media (max-width: 1024px) {
      .grid-3 { grid-template-columns: repeat(2, 1fr); }
      .masonry { columns: 2; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 768px) {
      .hamburger { display: block; }
      .nav-menu { display: none; position: absolute; top:72px; left:0; background:#0B0F1C; width:100%; flex-direction:column; padding:24px; }
      .nav-menu.active { display: flex; }
      .hero { flex-direction: column; }
      .grid-3 { grid-template-columns: 1fr; }
      .masonry { columns: 1; }
      .compare-grid { flex-direction: column; }
      .footer-grid { grid-template-columns: 1fr; }
    }