/* roulang page: index */
:root {
      --ink-black: #0B0E14;
      --signal-cyan: #00E5A1;
      --dark-graphite: #1A1F2B;
      --mist-gray: #F4F5F7;
      --white: #FFFFFF;
      --alert-orange: #FF6B4A;
      --data-blue: #2D7FF9;
      --body-text: #3A3F4B;
      --border-light: rgba(0,0,0,0.04);
      --shadow-card: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-hover: 0 12px 32px rgba(0,229,161,0.08);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-tag: 6px;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', system-ui, sans-serif;
      --transition-smooth: 0.25s cubic-bezier(0.25, 0.8, 0.25, 1.2);
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--white);
      color: var(--body-text);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }

    /* 导航双行杂志频道 */
    .nav-brand-row {
      background-color: var(--ink-black);
      height: 60px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 20px;
      color: white;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 22px;
      letter-spacing: 1px;
      color: white;
    }
    .logo i {
      color: var(--signal-cyan);
      font-size: 24px;
    }
    .nav-actions {
      display: flex;
      align-items: center;
      gap: 24px;
      color: #ccc;
    }
    .nav-actions i {
      font-size: 20px;
      cursor: pointer;
      transition: color 0.2s;
    }
    .nav-actions i:hover {
      color: var(--signal-cyan);
    }

    .nav-channel-row {
      background-color: var(--dark-graphite);
      height: 48px;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 32px;
      padding: 0 20px;
      overflow-x: auto;
      white-space: nowrap;
    }
    .nav-channel-row a {
      color: #aaa;
      font-size: 14px;
      font-weight: 500;
      letter-spacing: 0.04em;
      text-transform: uppercase;
      position: relative;
      padding-bottom: 4px;
      transition: color 0.2s;
    }
    .nav-channel-row a:hover,
    .nav-channel-row a.active {
      color: white;
    }
    .nav-channel-row a::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--signal-cyan);
      transition: width 0.2s;
    }
    .nav-channel-row a:hover::after,
    .nav-channel-row a.active::after {
      width: 100%;
    }

    .mobile-menu-toggle {
      display: none;
    }

    /* 板块通用间距 */
    section {
      padding: 100px 0;
    }
    @media (max-width: 1024px) {
      section {
        padding: 70px 0;
      }
    }
    @media (max-width: 640px) {
      section {
        padding: 50px 0;
      }
    }

    h1, h2, h3 {
      font-weight: 600;
    }

    /* Hero */
    .hero {
      background: linear-gradient(160deg, var(--ink-black) 0%, var(--dark-graphite) 100%);
      color: white;
      padding: 0 0 60px;
      position: relative;
      overflow: hidden;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 40px;
      max-width: 1200px;
      margin: 0 auto;
      padding: 40px 20px 0;
    }
    .hero-left {
      flex: 0 0 60%;
    }
    .hero-right {
      flex: 0 0 40%;
      position: relative;
    }
    .hero h1 {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
      letter-spacing: -0.02em;
      margin-bottom: 20px;
      color: white;
    }
    .hero-sub {
      font-size: 18px;
      opacity: 0.9;
      margin-bottom: 32px;
      max-width: 500px;
    }
    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--signal-cyan);
      color: var(--ink-black);
      font-weight: 600;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-size: 16px;
      border: none;
      cursor: pointer;
      transition: var(--transition-smooth);
      box-shadow: 0 4px 12px rgba(0,229,161,0.3);
      display: inline-block;
      text-align: center;
    }
    .btn-primary:hover {
      background: #00F0B0;
      transform: scale(1.03);
      box-shadow: 0 8px 18px rgba(0,229,161,0.5);
      color: var(--ink-black);
    }
    .btn-outline {
      border: 2px solid var(--signal-cyan);
      color: var(--signal-cyan);
      background: transparent;
      font-weight: 600;
      padding: 10px 26px;
      border-radius: var(--radius-btn);
      font-size: 16px;
      transition: var(--transition-smooth);
      cursor: pointer;
    }
    .btn-outline:hover {
      background: rgba(0,229,161,0.1);
      color: var(--signal-cyan);
    }
    .hero-img {
      width: 100%;
      border-radius: 20px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.5);
      position: relative;
      z-index: 2;
    }

    .section-title {
      font-size: 36px;
      font-weight: 600;
      margin-bottom: 16px;
      color: var(--ink-black);
    }
    .section-desc {
      color: #5a5f6b;
      max-width: 700px;
      margin-bottom: 40px;
    }

    /* 核心优势网格 */
    .advantages-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .adv-card {
      background: var(--white);
      padding: 28px 24px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      border: 1px solid var(--border-light);
      transition: all 0.25s ease;
    }
    .adv-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
      border-color: var(--signal-cyan);
    }
    .adv-icon {
      font-size: 32px;
      color: var(--signal-cyan);
      margin-bottom: 16px;
    }
    .adv-card h3 {
      font-size: 20px;
      margin-bottom: 10px;
    }

    /* 服务矩阵非对称 */
    .service-row {
      display: flex;
      gap: 40px;
      align-items: stretch;
    }
    .service-left {
      flex: 1;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: var(--radius-card);
      min-height: 400px;
      position: relative;
      display: flex;
      align-items: flex-end;
      padding: 30px;
      color: white;
    }
    .service-left .overlay {
      position: absolute;
      inset: 0;
      background: rgba(0,0,0,0.5);
      border-radius: var(--radius-card);
    }
    .service-left span {
      position: relative;
      z-index: 2;
      font-size: 28px;
      font-weight: 700;
    }
    .service-right {
      flex: 1;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .service-item {
      display: flex;
      align-items: center;
      gap: 20px;
      padding: 16px 20px;
      border-radius: var(--radius-card);
      transition: background 0.2s;
      cursor: default;
    }
    .service-item:hover {
      background: var(--mist-gray);
    }
    .service-num {
      font-size: 32px;
      font-weight: 700;
      color: var(--signal-cyan);
      width: 50px;
    }

    /* 案例瀑布流 */
    .masonry {
      columns: 3;
      column-gap: 20px;
    }
    .case-card {
      break-inside: avoid;
      margin-bottom: 20px;
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: all 0.2s;
      border: 1px solid var(--border-light);
    }
    .case-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .case-img-wrap {
      position: relative;
      overflow: hidden;
    }
    .case-img-wrap img {
      width: 100%;
      display: block;
    }
    .case-overlay {
      position: absolute;
      inset: 0;
      background: rgba(0,229,161,0.3);
      opacity: 0;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-weight: 600;
      transition: 0.3s;
    }
    .case-card:hover .case-overlay {
      opacity: 1;
    }
    .case-content {
      padding: 20px;
    }
    .tag {
      background: #eef2f6;
      color: #2c3e50;
      font-size: 12px;
      padding: 4px 10px;
      border-radius: 20px;
      font-weight: 500;
      display: inline-block;
      margin-bottom: 8px;
    }

    /* 对比表 */
    .compare-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
    }
    .compare-col {
      padding: 30px;
      border-radius: var(--radius-card);
    }
    .traditional {
      background: #fef0ed;
      border: 1px solid #ffcdc0;
    }
    .bg-solution {
      background: var(--dark-graphite);
      color: white;
    }
    .compare-col h3 i {
      margin-right: 8px;
    }

    /* 数据墙 */
    .data-wall {
      background: var(--dark-graphite);
      display: flex;
      gap: 40px;
      overflow-x: auto;
      padding: 40px 20px;
      justify-content: center;
      color: white;
    }
    .data-item {
      text-align: center;
      min-width: 150px;
    }
    .data-num {
      font-size: 48px;
      font-weight: 700;
      color: var(--signal-cyan);
    }

    /* FAQ */
    .faq-layout {
      display: flex;
      gap: 40px;
    }
    .faq-cats {
      display: flex;
      flex-direction: column;
      gap: 12px;
      min-width: 140px;
    }
    .faq-cat {
      padding: 8px 16px;
      border-radius: 20px;
      font-weight: 500;
      cursor: pointer;
    }
    .faq-cat.active {
      background: var(--signal-cyan);
      color: black;
    }
    .accordion-item {
      border-bottom: 1px solid #ddd;
    }

    /* 终局CTA */
    .cta-final {
      background: var(--ink-black);
      color: white;
      text-align: center;
    }

    footer {
      background: var(--ink-black);
      color: #aaa;
      padding: 60px 20px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
    }

    @media (max-width: 1024px) {
      .hero-grid { flex-direction: column; }
      .advantages-grid { grid-template-columns: repeat(2,1fr); }
      .service-row { flex-direction: column; }
      .masonry { columns: 2; }
      .compare-grid { grid-template-columns: 1fr; }
      .faq-layout { flex-direction: column; }
    }
    @media (max-width: 640px) {
      .nav-channel-row { display: none; }
      .mobile-menu-toggle { display: block; }
      .advantages-grid { grid-template-columns: 1fr; }
      .masonry { columns: 1; }
      .footer-grid { grid-template-columns: 1fr; }
    }