:root {
      --bg: #f5f7f7;
      --card: #ffffff;
      --text: #172b31;
      --muted: #687a80;
      --line: #e5ebec;
      --accent: #087d85;
      --accent-hover: #06666d;
      --accent-soft: #e6f3f2;
      --warn: #b45309;
      --warn-soft: #fef3c7;
      --danger: #b42318;
      --danger-soft: #fef2f2;
      --radius: 16px;

      --ink: #172b31;
      --page: #f5f7f7;
      --panel: #ffffff;
      --panel-2: #f5f7f7;
      --border: #e5ebec;
      --green: #087d85;
      --cyan: #087d85;
      --amber: #b45309;
      --amber-soft: #fef3c7;
      --amber-border: #fde68a;
      --red: #b42318;
    }
    * { box-sizing: border-box; margin: 0; padding: 0; }
    body {
      font-family: "Be Vietnam Pro", system-ui, -apple-system, sans-serif;
      font-weight: 400;
      font-size: 14px;
      line-height: 1.5;
      background: var(--bg);
      color: var(--text);
      min-height: 100vh;
      -webkit-font-smoothing: antialiased;
    }
    .icon {
      width: 18px;
      height: 18px;
      stroke: currentColor;
      fill: none;
      stroke-width: 1.8;
      stroke-linecap: round;
      stroke-linejoin: round;
      flex: 0 0 auto;
    }
    .app {
      min-height: 100vh;
      display: grid;
      grid-template-columns: 232px minmax(0, 1fr);
    }
    .nav-sidebar {
      background: var(--card);
      border-right: 1px solid var(--line);
      padding: 20px 14px;
      display: flex;
      flex-direction: column;
      gap: 20px;
      position: sticky;
      top: 0;
      height: 100vh;
    }
    .brand {
      display: flex;
      align-items: center;
      gap: 10px;
      padding: 4px 10px;
      font-weight: 600;
      font-size: 15px;
      color: var(--text);
      text-decoration: none;
    }
    .brand-mark {
      width: 32px;
      height: 32px;
      border-radius: 10px;
      background: var(--accent-soft);
      color: var(--accent);
      display: grid;
      place-items: center;
    }
    .nav {
      display: flex;
      flex-direction: column;
      gap: 4px;
    }
    .nav a {
      display: flex;
      align-items: center;
      gap: 10px;
      padding: 10px 12px;
      border-radius: 10px;
      color: var(--muted);
      text-decoration: none;
      font-weight: 500;
    }
    .nav a:hover { background: var(--bg); color: var(--text); }
    .nav a.active { background: var(--accent-soft); color: var(--accent); }
    .sidebar-foot {
      margin-top: auto;
      padding-top: 12px;
      border-top: 1px solid var(--line);
    }
    .sidebar-foot a {
      display: block;
      padding: 8px 12px;
      color: var(--muted);
      text-decoration: none;
      font-size: 13px;
    }
    .sidebar-foot a:hover { color: var(--text); }

    .content {
      max-width: 1380px;
      width: 100%;
      margin: 0 auto;
      padding: 24px;
      display: flex;
      flex-direction: column;
      gap: 16px;
      min-width: 0;
    }
    .page-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 16px;
      flex-wrap: wrap;
    }
    .page-header h1 {
      font-size: 24px;
      line-height: 1.3;
      font-weight: 600;
      letter-spacing: -0.015em;
    }
    .page-header p {
      color: var(--muted);
      margin-top: 2px;
    }
    .header-actions {
      display: flex;
      align-items: center;
      gap: 10px;
      flex-wrap: wrap;
    }
    .status-dot {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      font-weight: 500;
      color: var(--text);
      padding: 6px 10px;
      border-radius: 999px;
      background: var(--card);
      border: 1px solid var(--line);
      font-size: 13px;
    }
    .status-dot::before {
      content: "";
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: var(--accent);
    }
    .status-dot.offline::before {
      background: var(--warn);
    }

    .btn {
      text-decoration: none;
      padding: 9px 14px;
      border-radius: 10px;
      font: inherit;
      font-size: 14px;
      font-weight: 500;
      border: 1px solid var(--line);
      background: var(--card);
      color: var(--text);
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
    }
    .btn:hover { border-color: #cbd6d8; }
    .btn.primary { background: var(--accent); border-color: var(--accent); color: #ffffff; }
    .btn.secondary { background: var(--bg); }
    .btn.tertiary { border-color: transparent; background: transparent; color: var(--muted); padding: 6px 8px; }
    .btn.tertiary:hover { color: var(--text); }
    .btn.green { background: var(--accent-soft); border-color: #cce5e3; color: var(--accent); }

    /* WORKSPACE */
    .workspace {
      display: grid;
      grid-template-columns: minmax(0, 2fr) minmax(300px, 1fr);
      gap: 16px;
      align-items: start;
    }
    @media (max-width: 1100px) {
      .workspace { grid-template-columns: 1fr; }
    }

    /* WOKWI REAL WORKBENCH CANVAS */
    .workbench-card {
      background: var(--card);
      border: 1px solid var(--line);
      border-radius: var(--radius);
      display: flex;
      flex-direction: column;
      overflow: hidden;
      padding: 18px;
      gap: 12px;
    }
    .card-head {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 12px;
      flex-wrap: wrap;
    }
    .card-head h2 {
      font-size: 16px;
      line-height: 1.4;
      font-weight: 500;
    }
    .card-head span {
      font-size: 12px;
      color: var(--muted);
    }

    .workbench-scroll {
      width: 100%;
      overflow: auto;
      background: #1e242b;
      background-image: radial-gradient(circle at 1px 1px, rgba(255, 255, 255, 0.08) 1px, transparent 0);
      background-size: 18px 18px;
      padding: 10px;
      border-radius: 12px;
    }

    /* KHUNG BÀN MẠCH CỐ ĐỊNH TỌA ĐỘ 1220 x 720 ĐỂ CẮM CHÍNH XÁC TỪNG LỖ */
    .circuit-stage {
      position: relative;
      width: 1220px;
      height: 710px;
      margin: 0 auto;
      user-select: none;
    }

    /* LỚP DÂY NỐI SVG NẰM TRÊN CÙNG (POINTER-EVENTS NONE ĐỂ BẤM XUYÊN XUỐNG LINH KIỆN) */
    svg#wireLayer {
      position: absolute;
      top: 0;
      left: 0;
      width: 1220px;
      height: 710px;
      pointer-events: none;
      z-index: 30;
    }

    .hw-comp {
      position: absolute;
      z-index: 20;
    }
    .comp-tag {
      position: absolute;
      background: rgba(15, 23, 42, 0.92);
      border: 1px solid #475569;
      color: #f8fafc;
      font-size: 11px;
      font-weight: 500;
      padding: 2px 7px;
      border-radius: 5px;
      white-space: nowrap;
      pointer-events: none;
      z-index: 35;
    }
    .pin-callout {
      position: absolute;
      font-family: Consolas, monospace;
      font-size: 10.5px;
      font-weight: 500;
      padding: 1px 5px;
      border-radius: 4px;
      background: #0f172a;
      border: 1px solid #475569;
      color: #fde047;
      z-index: 25;
      white-space: nowrap;
    }

    /* HIỆU ỨNG LỌC DÂY THEO TỪNG BƯỚC */
    .w-group {
      transition: opacity 0.22s ease, filter 0.22s ease;
    }
    .w-group.dimmed { opacity: 0.08; }
    .w-group.active-step {
      opacity: 1;
      filter: drop-shadow(0 0 5px rgba(56, 189, 248, 0.85));
    }

    /* SIDEBAR THIẾT BỊ KẾT NỐI */
    .sidebar {
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .card {
      background: var(--card);
      border: 1px solid var(--line);
      border-radius: var(--radius);
      padding: 18px;
    }
    .card h3 {
      font-size: 16px;
      font-weight: 600;
      margin-bottom: 12px;
      color: var(--text);
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 6px;
    }
    .sensor-summary {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 10px;
      margin-bottom: 14px;
    }
    .sensor-box {
      padding: 12px;
      border-radius: 12px;
      background: var(--bg);
      border: 1px solid var(--line);
    }
    .sensor-box span {
      display: block;
      font-size: 12.5px;
      color: var(--muted);
    }
    .sensor-box strong {
      display: block;
      font-size: 16px;
      font-weight: 600;
      margin-top: 2px;
      color: var(--text);
    }
    .dev-grid {
      display: flex;
      flex-direction: column;
      gap: 8px;
    }
    .dev-btn {
      padding: 10px 12px;
      border-radius: 12px;
      border: 1px solid var(--line);
      background: var(--bg);
      color: var(--text);
      font: inherit;
      font-size: 13.5px;
      font-weight: 500;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .dev-btn:hover {
      border-color: #b8dedc;
      background: #ffffff;
    }
    .dev-btn.on {
      background: var(--accent-soft);
      border-color: #9cd0cd;
      color: var(--accent);
    }
    .dev-btn strong {
      font-weight: 500;
      font-size: 13px;
    }

    /* PANEL THÔNG SỐ KỸ THUẬT THU GỌN */
    details.tech-panel {
      background: var(--card);
      border: 1px solid var(--line);
      border-radius: var(--radius);
      padding: 16px 20px;
    }
    details.tech-panel > summary {
      list-style: none;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: space-between;
      font-size: 15px;
      font-weight: 600;
    }
    details.tech-panel > summary::-webkit-details-marker { display: none; }
    details.tech-panel[open] > summary {
      margin-bottom: 16px;
      padding-bottom: 12px;
      border-bottom: 1px solid var(--line);
    }
    .filter-bar {
      display: flex;
      align-items: center;
      gap: 6px;
      flex-wrap: wrap;
      margin-bottom: 12px;
    }
    .step-btn {
      padding: 6px 11px;
      border-radius: 8px;
      border: 1px solid var(--line);
      background: var(--bg);
      color: var(--muted);
      font: inherit;
      font-size: 12px;
      font-weight: 500;
      cursor: pointer;
      white-space: nowrap;
    }
    .step-btn.active {
      background: var(--accent);
      border-color: var(--accent);
      color: #ffffff;
    }
    .guide-footer {
      background: var(--bg);
      border: 1px solid var(--line);
      border-radius: 12px;
      padding: 12px 16px;
      margin-bottom: 14px;
    }
    .guide-footer h4 {
      font-size: 13.5px;
      font-weight: 600;
      color: var(--text);
      margin-bottom: 6px;
      display: flex;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 6px;
    }
    .guide-footer ol {
      padding-left: 18px;
      font-size: 13px;
      line-height: 1.55;
      color: var(--text);
    }
    .hole-badge {
      display: inline-block;
      padding: 1px 6px;
      border-radius: 5px;
      font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
      font-weight: 500;
      font-size: 11.5px;
      background: var(--accent-soft);
      border: 1px solid #cce5e3;
      color: var(--accent);
    }
    .ctrl-item {
      margin-bottom: 10px;
      padding-bottom: 10px;
      border-bottom: 1px dashed var(--line);
    }
    .ctrl-item:last-child { margin-bottom: 0; padding-bottom: 0; border-bottom: none; }
    .ctrl-top {
      display: flex;
      justify-content: space-between;
      font-size: 13px;
      font-weight: 500;
      margin-bottom: 4px;
    }
    input[type="range"] { width: 100%; accent-color: var(--accent); cursor: pointer; }
    .serial-box {
      background: var(--bg);
      border: 1px solid var(--line);
      border-radius: 9px;
      padding: 9px 11px;
      height: 165px;
      overflow-y: auto;
      font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
      font-size: 11.5px;
      line-height: 1.5;
      color: var(--text);
    }
    .serial-line.cmd { color: var(--accent); font-weight: 500; }
    .serial-line.warn { color: var(--warn); }
    .serial-line.ir { color: #1d5c63; }

    .mobile-nav { display: none; }

    @media (max-width: 900px) {
      .app { grid-template-columns: 1fr; }
      .nav-sidebar { position: static; height: auto; border-right: 0; border-bottom: 1px solid var(--line); }
      .nav { flex-direction: row; flex-wrap: wrap; }
      .sidebar-foot { display: none; }
      .content { padding: 16px 16px 88px; max-width: 100%; overflow-x: hidden; }
    }
    @media (max-width: 700px) {
      .nav-sidebar { display: none; }
      .mobile-nav {
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        z-index: 450;
        display: grid;
        grid-template-columns: repeat(5, minmax(0, 1fr));
        background: #ffffff;
        border-top: 1px solid var(--line);
        padding: 6px 4px max(8px, env(safe-area-inset-bottom));
        box-shadow: 0 -3px 16px rgba(31, 58, 62, 0.04);
      }
      .mobile-nav a {
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 2px;
        min-height: 47px;
        color: var(--muted);
        font-size: 10px;
        font-weight: 500;
        border-radius: 9px;
        text-decoration: none;
        white-space: nowrap;
        overflow: hidden;
      }
      .mobile-nav a.active {
        background: var(--accent-soft);
        color: var(--accent);
      }
      .mobile-nav .icon {
        width: 18px;
        height: 18px;
        stroke: currentColor;
        fill: none;
        stroke-width: 1.8;
        stroke-linecap: round;
        stroke-linejoin: round;
      }
    }