/* roulang page: index */
:root {
      --bg-base: #F8FAFC;
      --bg-white: #FFFFFF;
      --bg-dark: #0B0F19;
      --bg-dark-card: #131B2E;
      --primary: #00E599;
      --primary-hover: #00C882;
      --primary-dark: #004D33;
      --accent-blue: #2563EB;
      --text-main: #111827;
      --text-muted: #475569;
      --text-light: #94A3B8;
      --border-color: #E2E8F0;
      --border-dark: rgba(255, 255, 255, 0.1);
      --font-sans: 'PingFang SC', 'Noto Sans SC', 'Microsoft YaHei', -apple-system, BlinkMacSystemFont, sans-serif;
      --font-mono: 'JetBrains Mono', Consolas, Monaco, monospace;
      --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
      --shadow-card: 0 10px 25px -5px rgba(15, 23, 42, 0.06), 0 8px 10px -6px rgba(15, 23, 42, 0.04);
      --shadow-hover: 0 20px 30px -10px rgba(0, 229, 153, 0.15);
      --radius: 6px;
      --radius-sm: 4px;
      --container-max: 1240px;
    }

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

    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-base);
      color: var(--text-main);
      line-height: 1.65;
      -webkit-font-smoothing: antialiased;
    }

    a {
      color: inherit;
      text-decoration: none;
      transition: all 0.25s ease;
    }

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

    .container {
      width: 100%;
      max-width: var(--container-max);
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }

    .section {
      padding: 96px 0;
      position: relative;
    }

    .section-alt {
      background-color: var(--bg-white);
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
    }

    .section-dark {
      background-color: var(--bg-dark);
      color: #FFFFFF;
    }

    .section-header {
      margin-bottom: 56px;
    }

    .section-header.text-center {
      text-align: center;
    }

    .badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      font-family: var(--font-mono);
      font-size: 12px;
      font-weight: 600;
      text-transform: uppercase;
      letter-spacing: 0.08em;
      padding: 4px 10px;
      border-radius: var(--radius-sm);
      background: rgba(0, 229, 153, 0.12);
      color: #009664;
      margin-bottom: 16px;
      border: 1px solid rgba(0, 229, 153, 0.3);
    }

    .badge-dark {
      background: rgba(0, 229, 153, 0.15);
      color: var(--primary);
      border-color: rgba(0, 229, 153, 0.35);
    }

    h1, h2, h3, h4 {
      color: var(--text-main);
      font-weight: 700;
      line-height: 1.25;
      letter-spacing: -0.02em;
    }

    .section-dark h1, .section-dark h2, .section-dark h3, .section-dark h4 {
      color: #FFFFFF;
    }

    .section-title {
      font-size: 34px;
      margin-bottom: 18px;
    }

    .section-desc {
      font-size: 16px;
      color: var(--text-muted);
      max-width: 820px;
      line-height: 1.7;
    }

    .section-dark .section-desc {
      color: var(--text-light);
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 13px 28px;
      font-size: 15px;
      font-weight: 600;
      border-radius: var(--radius-sm);
      cursor: pointer;
      border: 1px solid transparent;
      transition: all 0.25s ease;
      white-space: nowrap;
    }

    .btn-primary {
      background-color: var(--primary);
      color: #0B0F19;
      border-color: var(--primary);
      box-shadow: 0 4px 14px rgba(0, 229, 153, 0.3);
    }

    .btn-primary:hover {
      background-color: var(--primary-hover);
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(0, 229, 153, 0.4);
    }

    .btn-outline {
      background-color: transparent;
      color: #FFFFFF;
      border-color: rgba(255, 255, 255, 0.3);
    }

    .btn-outline:hover {
      background-color: rgba(255, 255, 255, 0.1);
      border-color: #FFFFFF;
    }

    .btn-block {
      width: 100%;
    }

    /* Top Sub-Bar */
    .topbar {
      background: #060911;
      color: #94A3B8;
      font-size: 12px;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
      padding: 8px 0;
    }
    .topbar-content {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .topbar-left {
      display: flex;
      gap: 20px;
      align-items: center;
    }
    .topbar-right a {
      color: var(--primary);
      font-family: var(--font-mono);
      font-size: 12px;
    }

    /* Main Navigation */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 999;
      background: rgba(11, 15, 25, 0.95);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-dark);
    }
    .navbar {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .brand-logo {
      display: flex;
      align-items: center;
      gap: 12px;
      color: #FFFFFF;
      font-size: 19px;
      font-weight: 700;
      letter-spacing: -0.01em;
    }
    .brand-logo svg {
      width: 32px;
      height: 32px;
      fill: var(--primary);
    }
    .nav-menu {
      display: flex;
      align-items: center;
      list-style: none;
      gap: 32px;
    }
    .nav-menu a {
      color: #CBD5E1;
      font-size: 15px;
      font-weight: 500;
      padding: 8px 0;
      position: relative;
    }
    .nav-menu a:hover, .nav-menu a.active {
      color: var(--primary);
    }
    .nav-menu a.active::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--primary);
    }
    .mobile-menu-btn {
      display: none;
      background: transparent;
      border: none;
      color: #FFFFFF;
      font-size: 24px;
      cursor: pointer;
    }

    /* 板块一：斜切色块首屏 (Hero) */
    .hero-skew {
      position: relative;
      background-color: var(--bg-dark);
      padding: 120px 0 160px;
      overflow: hidden;
      color: #FFFFFF;
    }
    .hero-bg-media {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      object-fit: cover;
      opacity: 0.18;
      pointer-events: none;
    }
    .hero-skew-polygon {
      position: absolute;
      bottom: -1px;
      left: 0;
      width: 100%;
      height: 80px;
      background: var(--bg-base);
      clip-path: polygon(0 100%, 100% 100%, 100% 0);
      z-index: 2;
    }
    .hero-container {
      position: relative;
      z-index: 3;
      display: grid;
      grid-template-columns: 1.1fr 0.9fr;
      gap: 48px;
      align-items: center;
    }
    .hero-text h1 {
      font-size: 46px;
      line-height: 1.2;
      margin-bottom: 24px;
      color: #FFFFFF;
    }
    .hero-text h1 span {
      color: var(--primary);
    }
    .hero-desc {
      font-size: 16px;
      color: #CBD5E1;
      line-height: 1.8;
      margin-bottom: 36px;
    }
    .hero-actions {
      display: flex;
      gap: 16px;
      align-items: center;
    }
    .hero-card {
      background: var(--bg-dark-card);
      border: 1px solid var(--border-dark);
      border-radius: var(--radius);
      padding: 24px;
      position: relative;
      box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
    }
    .hero-flight-spec {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 16px;
      margin-top: 16px;
    }
    .spec-item {
      background: rgba(255, 255, 255, 0.04);
      padding: 12px 14px;
      border-radius: var(--radius-sm);
      border-left: 2px solid var(--primary);
    }
    .spec-label {
      font-size: 12px;
      color: var(--text-light);
      display: block;
    }
    .spec-value {
      font-family: var(--font-mono);
      font-size: 18px;
      font-weight: 700;
      color: var(--primary);
    }

    /* 板块二：优惠阶梯 (Tier Matrix) */
    .tier-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .tier-card {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 36px 28px;
      display: flex;
      flex-direction: column;
      position: relative;
      transition: all 0.25s ease;
    }
    .tier-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-card);
    }
    .tier-card.featured {
      border: 2px solid var(--primary);
      box-shadow: 0 12px 30px rgba(0, 229, 153, 0.12);
    }
    .tier-tag {
      position: absolute;
      top: -12px;
      right: 24px;
      background: var(--primary);
      color: #0B0F19;
      font-size: 12px;
      font-weight: 700;
      padding: 2px 10px;
      border-radius: 12px;
    }
    .tier-title {
      font-size: 22px;
      margin-bottom: 8px;
    }
    .tier-meta {
      font-size: 14px;
      color: var(--text-muted);
      margin-bottom: 24px;
    }
    .tier-price-box {
      margin-bottom: 28px;
      padding-bottom: 24px;
      border-bottom: 1px solid var(--border-color);
    }
    .tier-level {
      font-size: 13px;
      color: var(--accent-blue);
      font-weight: 600;
      text-transform: uppercase;
      font-family: var(--font-mono);
    }
    .tier-features {
      list-style: none;
      margin-bottom: 32px;
      flex-grow: 1;
    }
    .tier-features li {
      font-size: 14px;
      color: var(--text-muted);
      margin-bottom: 12px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .tier-features li::before {
      content: '✓';
      color: var(--primary);
      font-weight: bold;
    }

    /* 板块三：套餐对比 (Table Compare) */
    .compare-table-wrapper {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      overflow-x: auto;
      box-shadow: var(--shadow-sm);
    }
    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 14px;
    }
    .compare-table th, .compare-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
    }
    .compare-table th {
      background: #F1F5F9;
      font-weight: 700;
      color: var(--text-main);
    }
    .compare-table tr:hover td {
      background: #FAFAFA;
    }
    .highlight-col {
      background: rgba(0, 229, 153, 0.04);
      font-weight: 600;
      color: #0F172A;
    }

    /* 板块四：限时入口 (Urgency Gate) */
    .countdown-bar {
      background: linear-gradient(135deg, #0B0F19 0%, #172554 100%);
      border-radius: var(--radius);
      padding: 40px;
      color: #FFFFFF;
      display: flex;
      align-items: center;
      justify-content: space-between;
      border: 1px solid rgba(0, 229, 153, 0.3);
      position: relative;
      overflow: hidden;
    }
    .countdown-info {
      max-width: 650px;
      z-index: 2;
    }
    .countdown-info h3 {
      font-size: 26px;
      margin-bottom: 12px;
      color: #FFFFFF;
    }
    .countdown-info p {
      color: #CBD5E1;
      font-size: 15px;
    }
    .countdown-action {
      z-index: 2;
      text-align: right;
    }
    .timer-units {
      display: flex;
      gap: 12px;
      margin-bottom: 16px;
    }
    .timer-box {
      background: rgba(0, 0, 0, 0.4);
      padding: 8px 14px;
      border-radius: var(--radius-sm);
      border: 1px solid rgba(255, 255, 255, 0.1);
      font-family: var(--font-mono);
      font-size: 18px;
      font-weight: bold;
      color: var(--primary);
    }

    /* 板块五：爆款清单 (Hot Products) */
    .hot-list-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .hot-card {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      overflow: hidden;
      transition: all 0.25s ease;
      display: flex;
      flex-direction: column;
    }
    .hot-card:hover {
      box-shadow: var(--shadow-card);
      transform: translateY(-4px);
    }
    .hot-img {
      height: 200px;
      width: 100%;
      object-fit: cover;
    }
    .hot-body {
      padding: 24px;
      flex-grow: 1;
      display: flex;
      flex-direction: column;
    }
    .hot-badge {
      font-size: 12px;
      font-family: var(--font-mono);
      color: var(--accent-blue);
      margin-bottom: 8px;
      font-weight: 600;
    }
    .hot-title {
      font-size: 20px;
      margin-bottom: 12px;
    }
    .hot-desc {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 20px;
      flex-grow: 1;
    }
    .hot-foot {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding-top: 16px;
      border-top: 1px solid var(--border-color);
    }
    .hot-tag-txt {
      font-size: 13px;
      font-weight: 600;
      color: #0F172A;
    }

    /* 板块六：核心痛点与安全边界对比 */
    .matrix-contrast {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
    }
    .contrast-box {
      border-radius: var(--radius);
      padding: 32px;
      border: 1px solid var(--border-color);
    }
    .contrast-box.negative {
      background: #FFF1F2;
      border-color: #FECDD3;
    }
    .contrast-box.positive {
      background: #F0FDF4;
      border-color: #BBF7D0;
    }
    .contrast-box h3 {
      font-size: 20px;
      margin-bottom: 16px;
      display: flex;
      align-items: center;
      gap: 10px;
    }
    .contrast-box.negative h3 { color: #BE123C; }
    .contrast-box.positive h3 { color: #15803D; }
    .contrast-list {
      list-style: none;
    }
    .contrast-list li {
      font-size: 14px;
      line-height: 1.6;
      margin-bottom: 12px;
      position: relative;
      padding-left: 20px;
      color: #334155;
    }
    .contrast-box.negative li::before {
      content: '✕';
      position: absolute;
      left: 0;
      color: #E11D48;
      font-weight: bold;
    }
    .contrast-box.positive li::before {
      content: '✓';
      position: absolute;
      left: 0;
      color: #16A34A;
      font-weight: bold;
    }

    /* 板块七：算法架构蜂窝网格 */
    .grid-algo {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .algo-card {
      background: var(--bg-dark-card);
      border: 1px solid var(--border-dark);
      padding: 28px;
      border-radius: var(--radius);
      position: relative;
      transition: all 0.25s ease;
    }
    .algo-card:hover {
      border-color: var(--primary);
      transform: translateY(-3px);
    }
    .algo-index {
      font-family: var(--font-mono);
      font-size: 13px;
      color: var(--primary);
      margin-bottom: 12px;
    }
    .algo-title {
      font-size: 18px;
      color: #FFFFFF;
      margin-bottom: 10px;
    }
    .algo-desc {
      font-size: 14px;
      color: var(--text-light);
      line-height: 1.65;
    }

    /* 板块八：评价墙 (Testimonials Wall) */
    .review-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .review-card {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 28px;
      display: flex;
      flex-direction: column;
    }
    .review-stars {
      color: #F59E0B;
      font-size: 14px;
      margin-bottom: 12px;
    }
    .review-text {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 20px;
      flex-grow: 1;
    }
    .review-author {
      display: flex;
      align-items: center;
      gap: 12px;
      padding-top: 16px;
      border-top: 1px solid var(--border-color);
    }
    .author-avatar {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: #E2E8F0;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      color: #475569;
      font-size: 14px;
    }
    .author-info h4 {
      font-size: 15px;
      margin-bottom: 2px;
    }
    .author-info span {
      font-size: 12px;
      color: var(--text-light);
      display: block;
    }

    /* 板块九：保障图标条 (Assurance Strip) */
    .guarantee-strip {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .guarantee-item {
      background: var(--bg-white);
      padding: 24px;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      text-align: center;
    }
    .guarantee-icon {
      width: 48px;
      height: 48px;
      margin: 0 auto 16px;
      background: rgba(0, 229, 153, 0.1);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: #009664;
      font-size: 20px;
    }
    .guarantee-item h4 {
      font-size: 16px;
      margin-bottom: 8px;
    }
    .guarantee-item p {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* 板块十：数据统计条 (Metrics Bar) */
    .metrics-bar {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      background: var(--bg-dark);
      border: 1px solid var(--border-dark);
      border-radius: var(--radius);
      padding: 40px;
      color: #FFFFFF;
    }
    .metric-col {
      text-align: center;
      border-right: 1px solid rgba(255, 255, 255, 0.08);
    }
    .metric-col:last-child {
      border-right: none;
    }
    .metric-number {
      font-family: var(--font-mono);
      font-size: 38px;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 6px;
    }
    .metric-label {
      font-size: 13px;
      color: #94A3B8;
      letter-spacing: 0.05em;
    }

    /* 板块十一：技术资讯/动态 */
    .news-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .news-card {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      overflow: hidden;
      display: flex;
      flex-direction: column;
    }
    .news-img {
      height: 180px;
      width: 100%;
      object-fit: cover;
    }
    .news-body {
      padding: 24px;
      flex-grow: 1;
    }
    .news-date {
      font-family: var(--font-mono);
      font-size: 12px;
      color: var(--text-light);
      margin-bottom: 8px;
    }
    .news-title {
      font-size: 18px;
      margin-bottom: 12px;
      line-height: 1.4;
    }
    .news-desc {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 板块十二：加购引导/部署表单 (CTA Gate) */
    .cta-wrapper {
      background: linear-gradient(135deg, #0B0F19 0%, #111827 100%);
      border-radius: var(--radius);
      padding: 56px 48px;
      border: 1px solid var(--border-dark);
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
      color: #FFFFFF;
    }
    .cta-content h3 {
      font-size: 32px;
      margin-bottom: 16px;
      color: #FFFFFF;
    }
    .cta-content p {
      font-size: 15px;
      color: #CBD5E1;
      line-height: 1.7;
      margin-bottom: 24px;
    }
    .cta-features {
      list-style: none;
      font-size: 14px;
      color: var(--primary);
      margin-bottom: 24px;
    }
    .cta-features li {
      margin-bottom: 8px;
    }
    .form-panel {
      background: rgba(255, 255, 255, 0.05);
      padding: 32px;
      border-radius: var(--radius);
      border: 1px solid rgba(255, 255, 255, 0.1);
    }
    .form-group {
      margin-bottom: 16px;
    }
    .form-label {
      display: block;
      font-size: 13px;
      color: #CBD5E1;
      margin-bottom: 6px;
    }
    .form-control {
      width: 100%;
      padding: 12px 14px;
      border-radius: var(--radius-sm);
      background: rgba(11, 15, 25, 0.8);
      border: 1px solid rgba(255, 255, 255, 0.15);
      color: #FFFFFF;
      font-size: 14px;
    }
    .form-control:focus {
      outline: none;
      border-color: var(--primary);
    }

    /* 页脚 */
    .site-footer {
      background: #060911;
      color: #94A3B8;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      padding: 72px 0 32px;
      font-size: 14px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 56px;
    }
    .footer-brand h4 {
      color: #FFFFFF;
      font-size: 18px;
      margin-bottom: 16px;
    }
    .footer-brand p {
      line-height: 1.7;
      margin-bottom: 20px;
    }
    .footer-links h5 {
      color: #FFFFFF;
      font-size: 15px;
      margin-bottom: 18px;
    }
    .footer-links ul {
      list-style: none;
    }
    .footer-links li {
      margin-bottom: 10px;
    }
    .footer-links a:hover {
      color: var(--primary);
    }
    .footer-bottom {
      padding-top: 28px;
      border-top: 1px solid rgba(255, 255, 255, 0.06);
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 13px;
      color: #64748B;
    }
    .footer-bottom a {
      color: #64748B;
    }

    /* 响应式断点 */
    @media (max-width: 1024px) {
      .hero-container {
        grid-template-columns: 1fr;
      }
      .tier-grid, .hot-list-grid, .grid-algo, .review-grid, .news-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .metrics-bar {
        grid-template-columns: repeat(2, 1fr);
        gap: 32px;
      }
      .metric-col {
        border-right: none;
      }
      .cta-wrapper {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .section {
        padding: 64px 0;
      }
      .topbar {
        display: none;
      }
      .nav-menu {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #0B0F19;
        flex-direction: column;
        padding: 24px;
        border-bottom: 1px solid var(--border-dark);
      }
      .nav-menu.active {
        display: flex;
      }
      .mobile-menu-btn {
        display: block;
      }
      .hero-text h1 {
        font-size: 32px;
      }
      .tier-grid, .hot-list-grid, .grid-algo, .review-grid, .news-grid, .matrix-contrast, .guarantee-strip {
        grid-template-columns: 1fr;
      }
      .metrics-bar {
        grid-template-columns: 1fr;
      }
      .countdown-bar {
        flex-direction: column;
        text-align: center;
        gap: 24px;
      }
      .countdown-action {
        text-align: center;
      }
      .timer-units {
        justify-content: center;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .footer-bottom {
        flex-direction: column;
        gap: 12px;
        text-align: center;
      }
    }