:root {
      --primary: rgb(234,67,53);
      --primary-hover: rgba(234,67,53,0.85);
      --glacier-blue: #1D7BFF;
      --sea-ink: #0A1128;
      --silver-white: #F8FAFC;
      --border-color: #E2E8F0;
      --text-main: #0F172A;
      --text-muted: #64748B;
      --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
      --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
      --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }

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

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
      color: var(--text-main);
      background-color: var(--silver-white);
      line-height: 1.6;
    }

    a {
      color: inherit;
      text-decoration: none;
      transition: var(--transition);
    }

    .container {
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }

    
    .header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(8px);
      border-bottom: 1px solid var(--border-color);
    }

    .header-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 70px;
    }

    .logo {
      display: inline-flex;
      align-items: center;
      gap: 12px;
    }

    .logo img {
      display: block;
      height: 40px;
      width: auto;
      max-width: 160px;
      object-fit: contain;
      flex-shrink: 0;
    }

    .logo span {
      display: inline-block;
      font-size: 20px;
      font-weight: 800;
      color: var(--sea-ink);
    }

    .nav-desktop {
      display: flex;
      align-items: center;
      gap: 24px;
    }

    .nav-desktop a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-muted);
    }

    .nav-desktop a:hover {
      color: var(--primary);
    }

    .header-actions {
      display: flex;
      align-items: center;
      gap: 16px;
    }

    .btn-download-nav {
      background-color: var(--primary);
      color: #fff !important;
      padding: 8px 18px;
      border-radius: 6px;
      font-size: 14px;
      font-weight: 600;
    }

    .btn-download-nav:hover {
      background-color: var(--primary-hover);
    }

    .drawer-trigger {
      display: none;
      flex-direction: column;
      justify-content: space-between;
      width: 24px;
      height: 18px;
      background: none;
      border: none;
      cursor: pointer;
    }

    .drawer-trigger span {
      display: block;
      width: 100%;
      height: 2px;
      background-color: var(--sea-ink);
    }

    
    .drawer-overlay {
      position: fixed;
      top: 0;
      left: 0;
      width: 100vw;
      height: 100vh;
      background: rgba(0, 0, 0, 0.5);
      z-index: 150;
      opacity: 0;
      visibility: hidden;
      transition: var(--transition);
    }

    .drawer-overlay.active {
      opacity: 1;
      visibility: visible;
    }

    .drawer {
      position: fixed;
      top: 0;
      left: -280px;
      width: 280px;
      height: 100vh;
      background-color: #fff;
      z-index: 200;
      box-shadow: 0 10px 15px -3px rgba(0,0,0,0.1);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }

    .drawer.active {
      left: 0;
    }

    .drawer-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 20px;
      border-bottom: 1px solid var(--border-color);
    }

    .drawer-close {
      background: none;
      border: none;
      font-size: 28px;
      cursor: pointer;
      color: var(--text-muted);
    }

    .drawer-content {
      flex: 1;
      overflow-y: auto;
      padding: 20px;
    }

    .nav-mobile {
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .nav-mobile a {
      font-size: 16px;
      font-weight: 500;
      padding: 8px 12px;
      border-radius: 4px;
      color: var(--text-muted);
    }

    .nav-mobile a:hover {
      background-color: var(--silver-white);
      color: var(--primary);
    }

    
    .breadcrumbs {
      background-color: #fff;
      border-bottom: 1px solid var(--border-color);
      padding: 12px 0;
      font-size: 14px;
      color: var(--text-muted);
    }

    .breadcrumbs a:hover {
      color: var(--primary);
    }

    
    .article-layout {
      display: grid;
      grid-template-columns: 8fr 4fr;
      gap: 40px;
      margin: 40px auto;
    }

    .main-article {
      background-color: #fff;
      border: 1px solid var(--border-color);
      border-radius: 12px;
      padding: 40px;
      box-shadow: var(--shadow-sm);
    }

    .article-header {
      border-bottom: 1px solid var(--border-color);
      padding-bottom: 24px;
      margin-bottom: 30px;
    }

    .article-title {
      font-size: 32px;
      font-weight: 800;
      color: var(--sea-ink);
      line-height: 1.35;
      margin-bottom: 16px;
    }

    .article-meta-info {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 20px;
      font-size: 14px;
      color: var(--text-muted);
    }

    .meta-item {
      display: flex;
      align-items: center;
      gap: 6px;
    }

    
    .article-body {
      font-size: 16px;
      color: #334155;
      line-height: 1.8;
    }

    .article-body p {
      margin-bottom: 20px;
    }

    .article-body h2 {
      font-size: 22px;
      font-weight: 700;
      color: var(--sea-ink);
      margin: 35px 0 15px;
    }

    .article-body h3 {
      font-size: 18px;
      font-weight: 700;
      color: var(--sea-ink);
      margin: 25px 0 10px;
    }

    .article-body img {
      border-radius: 8px;
      margin: 20px 0;
      box-shadow: var(--shadow-sm);
      display: block;
      margin-left: auto;
      margin-right: auto;
    }

    .article-body ul, .article-body ol {
      margin-bottom: 20px;
      padding-left: 20px;
    }

    .article-body li {
      margin-bottom: 8px;
    }

    
    .article-tag-links {
      display: flex;
      gap: 10px;
      margin-top: 40px;
      padding-top: 20px;
      border-top: 1px solid var(--border-color);
    }

    .tag-link-btn {
      background-color: var(--silver-white);
      color: var(--text-muted);
      padding: 6px 14px;
      border-radius: 6px;
      font-size: 13px;
    }

    .tag-link-btn:hover {
      background-color: var(--primary);
      color: #fff;
    }

    
    .prev-next-box {
      margin-top: 30px;
      display: flex;
      justify-content: space-between;
      gap: 20px;
      font-size: 14px;
      border-top: 1px solid var(--border-color);
      padding-top: 20px;
    }

    .pnb-item {
      max-width: 50%;
    }

    .pnb-label {
      color: var(--text-muted);
      font-size: 12px;
      margin-bottom: 4px;
    }

    .pnb-title {
      font-weight: 600;
    }

    .pnb-title:hover {
      color: var(--primary);
    }

    
    .related-section {
      margin-top: 50px;
    }

    .related-title {
      font-size: 20px;
      font-weight: 700;
      color: var(--sea-ink);
      margin-bottom: 20px;
    }

    .related-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }

    .related-card {
      background-color: #fff;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      overflow: hidden;
      display: flex;
      flex-direction: column;
    }

    .related-img {
      height: 120px;
      background-color: #f1f5f9;
    }

    .related-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    .related-body {
      padding: 15px;
      flex-grow: 1;
    }

    .related-card-title {
      font-size: 14px;
      font-weight: 600;
      line-height: 1.4;
    }

    .related-card-title:hover {
      color: var(--primary);
    }

    
    .sidebar {
      display: flex;
      flex-direction: column;
      gap: 30px;
    }

    .widget {
      background-color: #fff;
      border: 1px solid var(--border-color);
      border-radius: 12px;
      padding: 24px;
    }

    .widget-title {
      font-size: 18px;
      font-weight: 700;
      margin-bottom: 15px;
      border-left: 4px solid var(--primary);
      padding-left: 10px;
    }

    .hot-list {
      list-style: none;
    }

    .hot-item {
      display: flex;
      align-items: center;
      gap: 12px;
      padding: 10px 0;
      border-bottom: 1px solid var(--border-color);
    }

    .hot-item:last-child {
      border-bottom: none;
    }

    .hot-num {
      width: 24px;
      height: 24px;
      border-radius: 50%;
      background-color: var(--silver-white);
      color: var(--text-muted);
      font-weight: 700;
      font-size: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .hot-item:nth-child(1) .hot-num { background-color: var(--primary); color:#fff; }
    .hot-item:nth-child(2) .hot-num { background-color: #f97316; color:#fff; }
    .hot-item:nth-child(3) .hot-num { background-color: #eab308; color:#fff; }

    .hot-title {
      font-size: 14px;
      font-weight: 500;
    }

    .hot-title:hover {
      color: var(--primary);
    }

    
    .footer {
      background-color: var(--sea-ink);
      color: #94a3b8;
      padding: 60px 0 30px;
      border-top: 1px solid rgba(255, 255, 255, 0.05);
      font-size: 14px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr repeat(3, 1fr);
      gap: 40px;
      margin-bottom: 40px;
    }

    .footer-brand p {
      margin-top: 16px;
      line-height: 1.6;
    }

    .footer-title {
      color: #fff;
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 20px;
    }

    .footer-links {
      list-style: none;
    }

    .footer-links li {
      margin-bottom: 12px;
    }

    .footer-links a:hover {
      color: #fff;
    }

    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.05);
      padding-top: 30px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
    }

    @media (max-width: 991px) {
      .drawer-trigger { display: flex; }
      .nav-desktop, .btn-download-nav { display: none; }
      .article-layout { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: repeat(2, 1fr); }
    }

    @media (max-width: 768px) {
      .main-article { padding: 24px; }
      .article-title { font-size: 24px; }
      .related-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
    }