/* roulang page: index */
:root {
      --deep-space: #0B0A1E;
      --nebula-indigo: #2D2B5E;
      --star-gold: #E8B86D;
      --text-primary: #E8E6F0;
      --text-secondary: #9B97B2;
      --glass-bg: rgba(45, 43, 94, 0.4);
      --glass-border: rgba(232, 184, 109, 0.25);
      --glow-gold: 0 0 20px rgba(232, 184, 109, 0.5);
      --card-shadow: 0 8px 32px rgba(0,0,0,0.4);
      --card-hover-shadow: 0 12px 40px rgba(232,184,109,0.15);
      --border-radius-card: 16px;
      --border-radius-btn: 50px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      --container-max: 1280px;
      --section-gap: 80px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--deep-space);
      color: var(--text-primary);
      line-height: 1.75;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 5vw;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
    }
    /* 导航栏 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(11, 10, 30, 0.85);
      backdrop-filter: blur(30px);
      -webkit-backdrop-filter: blur(30px);
      border-bottom: 1px solid rgba(232, 184, 109, 0.2);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .star-graphic {
      position: relative;
      width: 36px;
      height: 36px;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .ring {
      position: absolute;
      border-radius: 50%;
      border: 1.5px solid var(--star-gold);
      opacity: 0.7;
    }
    .ring1 { width: 36px; height: 36px; }
    .ring2 { width: 26px; height: 26px; transform: rotate(30deg); }
    .ring3 { width: 16px; height: 16px; transform: rotate(-25deg); }
    .logo-text {
      font-size: 1.4rem;
      font-weight: 700;
      color: var(--star-gold);
      letter-spacing: 0.05em;
    }
    .nav-menu {
      display: flex;
      gap: 2rem;
      list-style: none;
    }
    .nav-menu a {
      font-weight: 500;
      color: var(--text-primary);
      padding-bottom: 4px;
      position: relative;
      transition: color 0.2s;
    }
    .nav-menu a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--star-gold);
      transition: width 0.3s ease;
      box-shadow: 0 0 8px var(--star-gold);
    }
    .nav-menu a:hover {
      color: var(--star-gold);
    }
    .nav-menu a:hover::after {
      width: 100%;
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 6px;
      background: none;
      border: none;
      cursor: pointer;
    }
    .hamburger span {
      display: block;
      width: 28px;
      height: 2px;
      background: var(--star-gold);
      transition: 0.3s;
    }
    @media (max-width: 768px) {
      .nav-menu {
        display: none;
      }
      .hamburger {
        display: flex;
      }
      .mobile-nav {
        position: fixed;
        top: 72px;
        left: 0;
        width: 100%;
        background: rgba(11,10,30,0.95);
        backdrop-filter: blur(25px);
        flex-direction: column;
        padding: 2rem;
        gap: 2rem;
        align-items: center;
        display: flex;
        transform: translateY(-120%);
        transition: transform 0.4s ease;
        z-index: 99;
      }
      .mobile-nav.active {
        transform: translateY(0);
      }
    }
    /* Hero */
    .hero {
      display: flex;
      align-items: center;
      gap: 60px;
      padding: 3rem 0;
      position: relative;
      background: radial-gradient(circle at 30% 50%, rgba(45,43,94,0.3) 0%, transparent 70%);
    }
    .hero-left {
      flex: 5;
    }
    .hero-right {
      flex: 4;
      position: relative;
    }
    .hero h1 {
      font-size: clamp(2.5rem, 5vw, 4rem);
      font-weight: 700;
      letter-spacing: 0.02em;
      margin-bottom: 1.2rem;
      background: linear-gradient(to right, #E8E6F0, #E8B86D);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-sub {
      font-size: 1.2rem;
      color: var(--text-secondary);
      margin-bottom: 2rem;
      max-width: 500px;
    }
    .btn-primary {
      background: linear-gradient(135deg, #E8B86D, #D4A24E);
      color: #0B0A1E;
      font-weight: 600;
      letter-spacing: 0.05em;
      text-transform: uppercase;
      padding: 14px 36px;
      border-radius: 50px;
      box-shadow: 0 0 30px rgba(232,184,109,0.4);
      transition: all 0.3s ease;
      display: inline-block;
    }
    .btn-primary:hover {
      box-shadow: 0 0 50px rgba(232,184,109,0.7);
      transform: scale(1.05);
    }
    .hero-image {
      border-radius: 24px;
      overflow: hidden;
      box-shadow: 0 0 40px rgba(232,184,109,0.25);
      animation: float 6s ease-in-out infinite;
      border: 1px solid rgba(232,184,109,0.3);
    }
    @keyframes float {
      0% { transform: translateY(0); }
      50% { transform: translateY(-10px); }
      100% { transform: translateY(0); }
    }
    .particles {
      position: absolute;
      top:0; left:0; width:100%; height:100%;
      pointer-events: none;
      overflow: hidden;
    }
    .particle {
      position: absolute;
      width: 3px; height: 3px;
      background: var(--star-gold);
      border-radius: 50%;
      opacity: 0.5;
      animation: rise 8s infinite;
    }
    @keyframes rise {
      0% { transform: translateY(100vh) scale(0); opacity: 0; }
      50% { opacity: 0.8; }
      100% { transform: translateY(-10vh) scale(1); opacity: 0; }
    }
    @media (max-width: 768px) {
      .hero {
        flex-direction: column;
        gap: 2rem;
      }
      .hero-right {
        order: -1;
      }
    }
    /* sections */
    section {
      padding: 3rem 0;
      margin-bottom: var(--section-gap);
    }
    h2 {
      font-size: clamp(2rem, 4vw, 2.8rem);
      font-weight: 600;
      text-align: center;
      margin-bottom: 2.5rem;
      color: var(--text-primary);
    }
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
      gap: 24px;
    }
    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border: 1px solid var(--glass-border);
      border-radius: var(--border-radius-card);
      padding: 24px;
      box-shadow: var(--card-shadow);
      transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1.2);
    }
    .glass-card:hover {
      box-shadow: var(--card-hover-shadow);
      transform: translateY(-4px);
    }
    .icon-placeholder {
      font-size: 2rem;
      color: var(--star-gold);
      margin-bottom: 1rem;
    }
    /* 瀑布流 */
    .masonry {
      column-count: 3;
      column-gap: 24px;
    }
    .masonry-card {
      break-inside: avoid;
      margin-bottom: 24px;
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      border: 1px solid var(--glass-border);
      border-radius: 16px;
      overflow: hidden;
      box-shadow: var(--card-shadow);
      transition: 0.3s;
    }
    .masonry-card:hover {
      transform: translateY(-4px);
    }
    .masonry-card img {
      width: 100%;
      height: auto;
    }
    .masonry-content {
      padding: 16px;
    }
    .tag {
      display: inline-block;
      font-size: 0.8rem;
      border: 1px solid var(--star-gold);
      color: var(--star-gold);
      padding: 2px 10px;
      border-radius: 20px;
      margin-right: 6px;
    }
    @media (max-width: 768px) {
      .masonry { column-count: 2; }
    }
    @media (max-width: 520px) {
      .masonry { column-count: 1; }
    }
    /* 对比表 */
    .compare-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      align-items: start;
    }
    .compare-card {
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      border: 1px solid var(--glass-border);
      border-radius: 20px;
      padding: 28px 20px;
      text-align: center;
    }
    .compare-card.recommend {
      border: 2px solid var(--star-gold);
      box-shadow: 0 0 30px rgba(232,184,109,0.3);
    }
    .badge {
      background: var(--star-gold);
      color: #0B0A1E;
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.8rem;
      font-weight: 600;
      display: inline-block;
      margin-bottom: 12px;
    }
    .btn-outline {
      border: 2px solid var(--star-gold);
      color: var(--star-gold);
      padding: 10px 24px;
      border-radius: 50px;
      font-weight: 600;
      transition: 0.3s;
      display: inline-block;
      margin-top: 1rem;
    }
    .btn-outline:hover {
      background: var(--star-gold);
      color: #0B0A1E;
    }
    @media (max-width: 768px) {
      .compare-grid { grid-template-columns: 1fr; }
    }
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid rgba(232,184,109,0.15);
      padding: 1rem 0;
    }
    .faq-question {
      font-weight: 600;
      font-size: 1.2rem;
      display: flex;
      align-items: center;
      gap: 8px;
      cursor: pointer;
      color: var(--text-primary);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      background: rgba(45,43,94,0.3);
      border-radius: 8px;
      margin-top: 8px;
      padding: 0 16px;
      color: var(--text-secondary);
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
      padding: 12px 16px;
    }
    /* CTA 横幅 */
    .cta-banner {
      background: #0B0A1E;
      background-image: radial-gradient(circle at 30% 50%, rgba(45,43,94,0.6) 0%, transparent 70%);
      text-align: center;
      padding: 4rem 1rem;
    }
    /* 页脚 */
    .footer {
      background: #070614;
      color: var(--text-secondary);
      padding: 3rem 0 1.5rem;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 2rem;
    }
    @media (max-width: 768px) {
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 480px) {
      .footer-grid { grid-template-columns: 1fr; }
    }