/* Force Font Awesome icons to stay upright */
    #module-rs-e9310-gt4sfp-features i,
    #module-rs-e9310-gt4sfp-features .fas,
    #module-rs-e9310-gt4sfp-features .far,
    #module-rs-e9310-gt4sfp-features .fab,
    #module-rs-e9310-gt4sfp-features .fa {
        font-style: normal !important;
    }

    #module-rs-e9310-gt4sfp-features * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    #module-rs-e9310-gt4sfp-features {
      font-family: Arial, sans-serif;
      font-size: 16px;
      line-height: 1.7;
      color: #334155;
      max-width: 1200px;
      margin: 0 auto;
      padding: 48px 24px;
    }
    #module-rs-e9310-gt4sfp-features .section-title {
      font-size: 28px;
      font-weight: 700;
      color: #0f172a;
      text-align: left;
      margin-bottom: 40px;
      padding-bottom: 10px;
      border-bottom: 3px solid #2563eb;
      display: inline-flex;
      align-items: center;
      gap: 12px;
    }
    #module-rs-e9310-gt4sfp-features .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }
    #module-rs-e9310-gt4sfp-features .feature-card {
      background: #ffffff;
      border: 1px solid #e2e8f0;
      border-radius: 12px;
      padding: 32px 24px;
      display: flex;
      flex-direction: column;
      align-items: center;
      transition: all 0.3s ease;
      box-shadow: 0 2px 8px rgba(0,0,0,0.04);
    }
    #module-rs-e9310-gt4sfp-features .feature-card:hover {
      transform: translateY(-6px);
      box-shadow: 0 12px 28px rgba(37, 99, 235, 0.12);
      border-color: #2563eb;
    }
    #module-rs-e9310-gt4sfp-features .feature-header {
      display: flex;
      align-items: center;
      gap: 12px;
      width: 100%;
      margin-bottom: 20px;
    }
    #module-rs-e9310-gt4sfp-features .feature-header i {
      font-size: 26px;
      color: #2563eb;
      flex-shrink: 0;
    }
    #module-rs-e9310-gt4sfp-features .feature-card h3 {
      font-size: 20px;
      font-weight: 700;
      color: #0f172a;
      text-align: left;
      line-height: 1.4;
    }

    /* Common diagram base */
    #module-rs-e9310-gt4sfp-features .feature-diagram {
      width: 100%;
      height: 140px;
      margin-bottom: 24px;
      display: flex;
      align-items: center;
      justify-content: center;
      background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 100%);
      border-radius: 10px;
      position: relative;
      overflow: hidden;
    }

    /* 1. Gigabit Uplink Diagram */
    .diag-gig-uplink {
      display: flex;
      align-items: center;
      gap: 12px;
      width: 90%;
    }
    .diag-gig-uplink .port-group {
      display: flex;
      flex-direction: column;
      gap: 4px;
      flex: 1;
    }
    .diag-gig-uplink .port-line {
      width: 100%;
      height: 5px;
      background: #93c5fd;
      border-radius: 2px;
    }
    .diag-gig-uplink .switch-core {
      width: 70px;
      height: 80px;
      background: #1d4ed8;
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-size: 22px;
      flex-shrink: 0;
    }
    .diag-gig-uplink .uplink-group {
      display: flex;
      flex-direction: column;
      gap: 8px;
      flex: 0.8;
    }
    .diag-gig-uplink .uplink-line {
      height: 7px;
      border-radius: 3px;
      background: linear-gradient(90deg, #3b82f6, #0ea5e9);
      animation: rate-pulse 2s infinite ease-in-out;
    }
    .diag-gig-uplink .uplink-line:nth-child(2) { animation-delay: 0.3s; }
    .diag-gig-uplink .uplink-line:nth-child(3) { animation-delay: 0.6s; }
    .diag-gig-uplink .uplink-line:nth-child(4) { animation-delay: 0.9s; }
    @keyframes rate-pulse {
      0%, 100% { opacity: 0.6; width: 80%; }
      50% { opacity: 1; width: 100%; }
    }

    /* 2. Fanless Cooling Diagram */
    .diag-fanless {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 20px;
      width: 85%;
    }
    .diag-fanless .chassis {
      width: 120px;
      height: 60px;
      background: #1e293b;
      border-radius: 6px;
      position: relative;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-size: 12px;
      font-weight: 600;
    }
    .diag-fanless .heat-sink {
      position: absolute;
      top: -10px;
      left: 50%;
      transform: translateX(-50%);
      display: flex;
      gap: 3px;
    }
    .diag-fanless .fin {
      width: 4px;
      height: 14px;
      background: #64748b;
      border-radius: 2px;
    }
    .diag-fanless .heat-wave {
      position: absolute;
      top: -30px;
      left: 50%;
      transform: translateX(-50%);
      width: 60px;
      height: 20px;
      border-top: 2px solid #f97316;
      border-radius: 50%;
      opacity: 0;
      animation: heat-rise 3s infinite ease-out;
    }
    .diag-fanless .heat-wave:nth-child(2) { animation-delay: 1s; }
    .diag-fanless .heat-wave:nth-child(3) { animation-delay: 2s; }
    @keyframes heat-rise {
      0% { opacity: 0; transform: translateX(-50%) translateY(0); }
      50% { opacity: 0.7; }
      100% { opacity: 0; transform: translateX(-50%) translateY(-20px); }
    }
    .diag-fanless .noise-label {
      font-size: 12px;
      color: #166534;
      font-weight: 600;
      background: #dcfce7;
      padding: 6px 12px;
      border-radius: 12px;
    }

    /* 3. VSU Diagram */
    .diag-vsu {
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 8px;
      width: 85%;
    }
    .diag-vsu .virtual-unit {
      width: 120px;
      height: 36px;
      background: #1d4ed8;
      border-radius: 4px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-size: 12px;
      font-weight: 700;
      box-shadow: 0 0 12px rgba(37, 99, 235, 0.5);
    }
    .diag-vsu .phy-devices {
      display: flex;
      gap: 10px;
      position: relative;
    }
    .diag-vsu .phy-device {
      width: 38px;
      height: 38px;
      background: #3b82f6;
      border-radius: 4px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-size: 14px;
    }
    .diag-vsu .stack-link {
      position: absolute;
      top: 50%;
      left: 50%;
      transform: translate(-50%, -50%);
      width: 100%;
      height: 3px;
      background: repeating-linear-gradient(90deg, #60a5fa 0 6px, transparent 6px 10px);
      animation: stack-flow 2s infinite linear;
    }
    @keyframes stack-flow {
      0% { background-position: 0 0; }
      100% { background-position: 20px 0; }
    }

    /* 4. Dual Boot Diagram */
    .diag-dualboot {
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 10px;
      width: 80%;
    }
    .diag-dualboot .cpu-core {
      width: 60px;
      height: 36px;
      background: #1d4ed8;
      border-radius: 6px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-size: 12px;
      font-weight: 700;
    }
    .diag-dualboot .flash-row {
      display: flex;
      gap: 24px;
      position: relative;
    }
    .diag-dualboot .flash-chip {
      width: 50px;
      height: 40px;
      background: #3b82f6;
      border-radius: 4px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-size: 10px;
      font-weight: 600;
      position: relative;
    }
    .diag-dualboot .flash-chip.active {
      box-shadow: 0 0 10px rgba(37, 99, 235, 0.8);
      animation: boot-switch 3s infinite;
    }
    .diag-dualboot .flash-chip.backup {
      opacity: 0.5;
      animation: boot-switch 3s infinite 1.5s;
    }
    @keyframes boot-switch {
      0%, 100% { opacity: 0.5; box-shadow: none; }
      50% { opacity: 1; box-shadow: 0 0 10px rgba(37, 99, 235, 0.8); }
    }

    /* 5. Security Diagram */
    .diag-security {
      display: flex;
      align-items: center;
      gap: 8px;
      width: 90%;
    }
    .diag-security .traffic-in {
      display: flex;
      flex-direction: column;
      gap: 4px;
      flex: 1;
    }
    .diag-security .traffic-item {
      height: 6px;
      border-radius: 3px;
    }
    .diag-security .traffic-normal { background: #22c55e; }
    .diag-security .traffic-attack { background: #ef4444; }
    .diag-security .shield-icon {
      color: #1d4ed8;
      font-size: 32px;
      flex-shrink: 0;
    }
    .diag-security .blocked {
      text-decoration: line-through;
      opacity: 0.3;
    }

    /* 6. SDN Diagram */
    .diag-sdn {
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 10px;
      width: 80%;
    }
    .diag-sdn .controller {
      width: 70px;
      height: 36px;
      background: #1d4ed8;
      border-radius: 6px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-size: 12px;
      font-weight: 700;
    }
    .diag-sdn .control-links {
      display: flex;
      justify-content: space-around;
      width: 100%;
      position: relative;
    }
    .diag-sdn .control-link {
      width: 2px;
      height: 30px;
      background: #60a5fa;
      position: relative;
    }
    .diag-sdn .control-link::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 50%;
      transform: translateX(-50%);
      width: 6px;
      height: 6px;
      background: #3b82f6;
      border-radius: 50%;
      animation: blink 1.5s infinite;
    }
    @keyframes blink {
      0%, 100% { opacity: 1; }
      50% { opacity: 0.3; }
    }
    .diag-sdn .devices {
      display: flex;
      justify-content: space-around;
      width: 100%;
    }
    .diag-sdn .sw-icon {
      font-size: 18px;
      color: #3b82f6;
    }

    /* 7. Energy Efficiency Diagram */
    .diag-energy {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 16px;
      width: 85%;
    }
    .diag-energy .leaf-icon {
      font-size: 36px;
      color: #16a34a;
      animation: leaf-breathe 2.5s infinite ease-in-out;
    }
    @keyframes leaf-breathe {
      0%, 100% { transform: scale(1); opacity: 0.9; }
      50% { transform: scale(1.1); opacity: 1; }
    }
    .diag-energy .energy-bars {
      display: flex;
      flex-direction: column;
      gap: 5px;
      flex: 1;
    }
    .diag-energy .energy-bar {
      height: 8px;
      border-radius: 4px;
      background: #e2e8f0;
      position: relative;
      overflow: hidden;
    }
    .diag-energy .energy-fill {
      height: 100%;
      border-radius: 4px;
      background: linear-gradient(90deg, #22c55e, #10b981);
      width: 35%;
      animation: energy-save 3s infinite ease-in-out;
    }
    @keyframes energy-save {
      0%, 100% { width: 40%; }
      50% { width: 30%; }
    }
    .diag-energy .save-label {
      font-size: 11px;
      color: #166534;
      font-weight: 600;
    }

    /* 8. Dual Stack Diagram */
    .diag-dualstack {
      display: flex;
      align-items: center;
      gap: 12px;
      width: 90%;
    }
    .diag-dualstack .stack-column {
      flex: 1;
      display: flex;
      flex-direction: column;
      gap: 6px;
    }
    .diag-dualstack .stack-header {
      padding: 6px;
      color: white;
      font-size: 12px;
      font-weight: 700;
      border-radius: 4px;
      text-align: center;
    }
    .diag-dualstack .ipv4 { background: #3b82f6; }
    .diag-dualstack .ipv6 { background: #8b5cf6; }
    .diag-dualstack .stack-item {
      height: 6px;
      border-radius: 3px;
      background: #cbd5e1;
      animation: stack-active 2s infinite ease-in-out;
    }
    .diag-dualstack .stack-item:nth-child(2) { animation-delay: 0.2s; }
    .diag-dualstack .stack-item:nth-child(3) { animation-delay: 0.4s; }
    .diag-dualstack .stack-item:nth-child(4) { animation-delay: 0.6s; }
    @keyframes stack-active {
      0%, 100% { background: #cbd5e1; }
      50% { background: #93c5fd; }
    }
    .diag-dualstack .forwarding-core {
      width: 50px;
      height: 60px;
      background: #1e293b;
      border-radius: 6px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-size: 20px;
      flex-shrink: 0;
    }

    /* Feature list */
    #module-rs-e9310-gt4sfp-features .feature-list {
      width: 100%;
      list-style: none;
      padding-left: 0;
    }
    #module-rs-e9310-gt4sfp-features .feature-list li {
      position: relative;
      padding-left: 20px;
      margin-bottom: 8px;
      color: #475569;
      text-align: left;
    }
    #module-rs-e9310-gt4sfp-features .feature-list li::before {
      content: '';
      position: absolute;
      left: 0;
      top: 9px;
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: #2563eb;
    }

    /* Responsive */
    @media (max-width: 992px) {
      #module-rs-e9310-gt4sfp-features .features-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 576px) {
      #module-rs-e9310-gt4sfp-features .features-grid {
        grid-template-columns: 1fr;
      }
      #module-rs-e9310-gt4sfp-features .section-title {
        font-size: 22px;
      }
    }