/* roulang page: index */
:root {
      --primary-deep: #0B1E1A;
      --accent-green: #3FE8A1;
      --warm-gold: #D4A853;
      --bg-dark: #121212;
      --bg-card: rgba(30, 30, 30, 0.65);
      --border-light: rgba(255, 255, 255, 0.08);
      --text-main: #FFFFFF;
      --text-body: #B0B8B5;
      --text-muted: #6B7370;
      --radius-lg: 20px;
      --radius-md: 12px;
      --radius-sm: 8px;
      --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
      --shadow-hover: 0 16px 40px rgba(63, 232, 161, 0.15);
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      background: linear-gradient(180deg, #121212 0%, #1A1A1A 100%);
      color: var(--text-body);
      line-height: 1.8;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    h1, h2, h3 {
      color: var(--text-main);
      font-weight: 700;
    }
    h1 {
      font-size: clamp(2.5rem, 6vw, 4.5rem);
      font-weight: 800;
      letter-spacing: 0.02em;
    }
    h2 {
      font-size: clamp(2rem, 4vw, 3rem);
      position: relative;
      padding-left: 20px;
      margin-bottom: 48px;
    }
    h2::before {
      content: '';
      position: absolute;
      left: 0;
      top: 50%;
      transform: translateY(-50%);
      width: 4px;
      height: 40px;
      background: var(--accent-green);
      border-radius: 2px;
    }
    h3 {
      font-size: 1.5rem;
      font-weight: 600;
    }
    a {
      color: var(--accent-green);
      text-decoration: none;
      transition: color 0.2s;
    }
    a:hover {
      color: var(--warm-gold);
    }
    img {
      max-width: 100%;
      display: block;
      border-radius: var(--radius-md);
    }
    button, .btn {
      cursor: pointer;
      font-family: inherit;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: all 0.3s ease;
    }
    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(10, 10, 10, 0.8);
      backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(255, 255, 255, 0.05);
      height: 72px;
      z-index: 1000;
      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 {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 1.8rem;
      font-weight: 700;
      color: var(--text-main);
    }
    .logo-icon {
      width: 28px;
      height: 28px;
      background: var(--accent-green);
      border-radius: 6px;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .nav-links {
      display: flex;
      gap: 32px;
      list-style: none;
    }
    .nav-links a {
      color: var(--text-body);
      font-weight: 500;
      font-size: 1rem;
      position: relative;
      padding: 4px 0;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--accent-green);
    }
    .nav-links a.active::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--accent-green);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: none;
      border: none;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--text-main);
      transition: 0.3s;
    }
    /* 首屏 Hero */
    .hero {
      padding: 140px 0 100px;
      display: flex;
      align-items: center;
      gap: 60px;
      background-image: radial-gradient(circle at 20% 20%, rgba(63,232,161,0.03) 0%, transparent 50%);
    }
    .hero-left {
      flex: 1 1 50%;
    }
    .hero-left h1 {
      margin-bottom: 24px;
    }
    .hero-sub {
      font-size: 1.2rem;
      color: var(--text-body);
      margin-bottom: 36px;
    }
    .btn-group {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: linear-gradient(135deg, #3FE8A1 0%, #1FA873 100%);
      color: #0B1E1A;
      font-weight: 700;
      border: none;
      border-radius: 50px;
      padding: 14px 36px;
      box-shadow: 0 4px 20px rgba(63,232,161,0.4);
      font-size: 1rem;
    }
    .btn-primary:hover {
      box-shadow: 0 6px 28px rgba(63,232,161,0.7);
      transform: scale(1.03);
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--accent-green);
      color: var(--accent-green);
      border-radius: 50px;
      padding: 14px 36px;
      font-weight: 600;
    }
    .btn-outline:hover {
      background: var(--accent-green);
      color: #0B1E1A;
    }
    .hero-right {
      flex: 1 1 50%;
      position: relative;
    }
    .hero-right img {
      width: 100%;
      border-radius: 24px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.6);
    }
    .hero-badge {
      position: absolute;
      bottom: -12px;
      right: -12px;
      background: rgba(11,30,26,0.9);
      backdrop-filter: blur(10px);
      color: var(--accent-green);
      padding: 10px 20px;
      border-radius: 40px;
      font-weight: 700;
      font-size: 0.9rem;
      border: 1px solid var(--accent-green);
    }
    /* 板块通用 */
    section {
      padding: 80px 0;
    }
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .glass-card {
      background: var(--bg-card);
      backdrop-filter: blur(16px);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-card);
      padding: 32px 24px;
      transition: all 0.3s ease;
    }
    .glass-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
      border-color: rgba(63,232,161,0.3);
    }
    .icon-circle {
      width: 56px;
      height: 56px;
      background: rgba(63,232,161,0.1);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      transition: 0.3s;
    }
    .glass-card:hover .icon-circle {
      background: var(--accent-green);
      transform: scale(1.1);
    }
    /* 杂志流 */
    .magazine-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 80px;
    }
    .magazine-row.reverse {
      flex-direction: row-reverse;
    }
    .magazine-img {
      flex: 1 1 48%;
    }
    .magazine-text {
      flex: 1 1 48%;
    }
    .magazine-text h3 {
      margin-bottom: 16px;
    }
    .link-arrow {
      color: var(--accent-green);
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      margin-top: 16px;
    }
    .link-arrow::after {
      content: '→';
      transition: transform 0.2s;
    }
    .link-arrow:hover::after {
      transform: translateX(4px);
    }
    /* 案例瀑布流 */
    .masonry {
      columns: 3;
      column-gap: 24px;
    }
    .masonry-item {
      break-inside: avoid;
      margin-bottom: 24px;
      background: #1E1E1E;
      border-radius: var(--radius-lg);
      overflow: hidden;
      transition: transform 0.3s;
      box-shadow: 0 10px 20px rgba(0,0,0,0.3);
    }
    .masonry-item:hover {
      transform: translateY(-6px);
      box-shadow: 0 18px 36px rgba(63,232,161,0.2);
    }
    .masonry-item img {
      width: 100%;
      display: block;
    }
    .masonry-content {
      padding: 20px;
    }
    .tag {
      background: rgba(63,232,161,0.2);
      color: var(--accent-green);
      font-size: 0.8rem;
      padding: 4px 12px;
      border-radius: 20px;
      display: inline-block;
      margin-bottom: 8px;
    }
    /* 对比表 */
    .compare-table {
      display: flex;
      gap: 0;
      border-radius: var(--radius-lg);
      overflow: hidden;
      background: rgba(30,30,30,0.9);
      backdrop-filter: blur(10px);
    }
    .col-plan {
      flex: 1;
      padding: 32px 24px;
      border-right: 1px solid rgba(255,255,255,0.05);
    }
    .col-plan:last-child {
      border-right: none;
    }
    .col-highlight {
      background: rgba(11,30,26,0.7);
      border: 1px solid var(--accent-green);
      border-radius: 16px;
      margin: -8px;
      padding: 40px 24px;
      position: relative;
      z-index: 2;
      box-shadow: 0 0 30px rgba(63,232,161,0.2);
    }
    .badge-recommend {
      background: var(--accent-green);
      color: #0B1E1A;
      font-weight: 700;
      padding: 4px 14px;
      border-radius: 20px;
      font-size: 0.8rem;
      position: absolute;
      top: -12px;
      right: 20px;
    }
    /* 数据带 */
    .trust-strip {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      gap: 32px;
      text-align: center;
    }
    .trust-item .number {
      font-family: 'Inter', sans-serif;
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--accent-green);
    }
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.1);
      padding: 24px 0;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      font-size: 1.1rem;
      cursor: pointer;
      color: #fff;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-body);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      margin-top: 16px;
    }
    /* CTA */
    .cta-full {
      background: #0B1E1A;
      text-align: center;
      padding: 100px 24px;
    }
    /* 页脚 */
    footer {
      background: #0A0A0A;
      padding: 60px 0;
      color: var(--text-muted);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    @media (max-width: 1024px) {
      .grid-3 { grid-template-columns: repeat(2, 1fr); }
      .masonry { columns: 2; }
      .compare-table { flex-direction: column; }
      .col-highlight { margin: 0; }
    }
    @media (max-width: 768px) {
      .hamburger { display: flex; }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: rgba(10,10,10,0.95);
        flex-direction: column;
        padding: 20px;
        gap: 16px;
      }
      .nav-links.open { display: flex; }
      .hero {
        flex-direction: column;
        padding-top: 100px;
      }
      .grid-3 { grid-template-columns: 1fr; }
      .magazine-row, .magazine-row.reverse {
        flex-direction: column;
      }
      .masonry { columns: 1; }
      .footer-grid { grid-template-columns: 1fr; }
      .btn-group .btn { width: 100%; }
    }
    @media (max-width: 480px) {
      .trust-strip { flex-direction: column; }
    }