:root{
    --bg-app: #0d1b3d;
    --bg-sidebar: #0a1530;
    --bg-panel: #16214a;
    --bg-card: #1b2a5c;
    --bg-input: #101c40;
    --accent: #3b6bd6;
    --accent-light: #5c8bf0;
    --teal: #14b8a6;
    --teal-dark: #0f9488;
    --danger: #e05a5a;
    --warning: #f2b705;
    --grey: #8fa0c9;
    --text-main: #eaf0ff;
    --text-dim: #9db0dd;
    --border: #26356e;
    --radius: 10px;
  }
  * { box-sizing: border-box; }
  html, body {
    margin: 0; padding: 0; height: 100%;
    background: var(--bg-app);
    color: var(--text-main);
    font-family: 'Segoe UI', Roboto, Arial, sans-serif;
  }
  #app { display: none; height: 100vh; }
  #login-screen {
    display: flex; align-items: center; justify-content: center;
    height: 100vh; background: radial-gradient(circle at top, #16214a 0%, #060c1f 100%);
  }
  .login-box {
    background: var(--bg-panel); border: 1px solid var(--border);
    padding: 40px 36px; border-radius: var(--radius); width: 360px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.5);
  }
  .login-box h1 { font-size: 20px; text-align: center; margin-bottom: 4px; color: var(--text-main);}
  .login-box p.sub { text-align:center; color: var(--text-dim); font-size: 13px; margin-bottom: 24px;}
  .field { margin-bottom: 16px; }
  .field label { display:block; font-size: 12px; color: var(--text-dim); margin-bottom: 6px; letter-spacing:.3px;}
  .field input, .field select, .field textarea {
    width: 100%; background: var(--bg-input); border: 1px solid var(--border);
    color: var(--text-main); padding: 10px 12px; border-radius: 8px; font-size: 14px;
  }
  .field input:focus, .field select:focus, .field textarea:focus { outline: none; border-color: var(--accent-light); }
  .btn {
    display:inline-flex; align-items:center; justify-content:center; gap:6px;
    padding: 10px 18px; border-radius: 8px; border:none; cursor:pointer;
    font-size: 14px; font-weight: 500; transition: 0.15s;
  }
  .btn-primary { background: var(--accent); color: #fff; }
  .btn-primary:hover { background: var(--accent-light); }
  .btn-teal { background: var(--teal); color: #06251f; font-weight:600; }
  .btn-teal:hover { background: var(--teal-dark); color:#fff; }
  .btn-danger { background: var(--danger); color:#fff; }
  .btn-ghost { background: transparent; border:1px solid var(--border); color: var(--text-main); }
  .btn-ghost:hover { background: var(--bg-card); }
  .btn-block { width: 100%; }
  .error-msg { color: var(--danger); font-size: 13px; margin-top: 4px; min-height: 16px;}

  /* Layout */
  #sidebar {
    width: 220px; background: var(--bg-sidebar); border-right: 1px solid var(--border);
    display: flex; flex-direction: column; padding: 20px 0; flex-shrink:0;
    transition: transform 0.25s ease; z-index: 300;
  }
  #sidebar .brand { padding: 0 20px 20px; font-weight: 700; font-size: 15px; color:var(--text-main); border-bottom: 1px solid var(--border); margin-bottom: 10px;}
  .nav-item {
    padding: 12px 22px; cursor: pointer; color: var(--text-dim); font-size: 14.5px;
    border-left: 3px solid transparent;
  }
  .nav-item:hover { color: var(--text-main); background: rgba(255,255,255,0.03); }
  .nav-item.active { color: #fff; background: var(--bg-card); border-left: 3px solid var(--teal); font-weight:600;}
  .nav-bottom { margin-top: auto; }

  #sidebar-overlay {
    display:none; position:fixed; inset:0; background:rgba(0,0,0,0.5); z-index:250;
  }
  #hamburger-btn {
    display:none; background:none; border:none; color:#fff; font-size:22px; cursor:pointer;
    margin-right:14px; line-height:1;
  }

  #main { flex: 1; display:flex; flex-direction:column; overflow-y:auto; min-width:0; }
  #topbar {
    background: linear-gradient(90deg, var(--accent), #2a4bb0);
    padding: 18px 24px; font-size: 26px; font-weight: 700; text-align:center;
    letter-spacing: .3px; display:flex; align-items:center; justify-content:center;
    position: relative;
  }
  #content { padding: 24px 30px; flex:1; }
  .page { display:none; }
  .page.active { display:block; }

  .table-responsive { overflow-x: auto; -webkit-overflow-scrolling: touch; }
  .table-responsive table { min-width: 640px; }

  /* Untuk tabel sempit 2 kolom (mis. Akan Jatuh Tempo) - tidak perlu min-width 640px,
     supaya kedua header selalu kelihatan tanpa perlu scroll horizontal. */
  .table-responsive-narrow { overflow-x: auto; -webkit-overflow-scrolling: touch; }
  .table-responsive-narrow table { min-width: 0; width: 100%; }

  /* Tinggi tabel dibatasi (kira-kira setinggi panel Total Kalibrasi Setiap Bulan di sebelahnya),
     sisanya bisa di-scroll vertikal, header tetap menempel di atas saat scroll. */
  .table-scroll-limited { max-height: 430px; overflow-y: auto; }
  .table-scroll-limited thead th { position: sticky; top: 0; z-index: 2; }

  .filter-bar { display:flex; gap:10px; flex-wrap:wrap; margin-bottom: 20px; align-items:center;}
  .filter-btn {
    background: var(--bg-card); border: 1px solid var(--border); color: var(--text-main);
    padding: 8px 16px; border-radius: 8px; cursor:pointer; font-size: 13.5px;
  }
  .filter-btn.active { background: var(--accent); border-color: var(--accent-light); }
  .filter-select {
    background: var(--bg-card); border: 1px solid var(--border); color: var(--text-main);
    padding: 8px 14px; border-radius: 8px; font-size: 13.5px;
  }

  .cards-row { display:flex; flex-direction:column; gap:12px; width: 220px; }
  .stat-card {
    background: var(--bg-card); border-radius: var(--radius); padding: 13px 16px;
    text-align:center; border: 1px solid var(--border);
  }
  .stat-card .num { font-size: 26px; font-weight:700; color:#fff; }
  .stat-card .label { font-size: 12.5px; color: var(--text-dim); margin-top:2px; }

  .dash-grid { display:grid; grid-template-columns: 240px 1fr 300px; gap: 16px; align-items: start; }

  .donut-kondisi-row { display:flex; gap:16px; flex-wrap:wrap; }
  .dash-middle-col { display:flex; flex-direction:column; gap:16px; min-width:0; }
  .donut-kondisi-row .panel { flex:1; min-width:260px; }
  .donut-legend-row { display:flex; align-items:center; gap:16px; flex-wrap:wrap; justify-content:center; }
  .donut-legend { display:flex; flex-direction:column; gap:6px; }
  .donut-legend-item { display:flex; align-items:center; gap:7px; font-size:12.5px; color: var(--text-main); }
  .donut-legend-swatch { width:10px; height:10px; border-radius:2px; flex-shrink:0; }

  .kondisi-alat-panel { display:flex; flex-direction:column; align-items:center; justify-content:center; text-align:center; }
  .kondisi-percent { font-size:34px; font-weight:800; color:#fff; line-height:1; margin-top:4px; }
  .kondisi-percent-label { font-size:12px; letter-spacing:1px; color: var(--teal); font-weight:700; margin-bottom:10px; }
  .kondisi-split { display:flex; gap:10px; width:100%; }
  .kondisi-split-item {
    flex:1; border:1px solid var(--border); border-radius:8px; padding:8px 6px;
  }
  .kondisi-split-num { font-size:19px; font-weight:700; color:#fff; }
  .kondisi-split-label { font-size:11.5px; color: var(--text-dim); margin-top:2px; }
  .panel { background: var(--bg-panel); border:1px solid var(--border); border-radius: var(--radius); padding: 14px; }
  .panel h3 { margin:0 0 10px; font-size:14px; color:var(--text-main); }

  table { width:100%; border-collapse: collapse; font-size: 13.5px; }
  th { background: var(--accent); color:#fff; text-align:left; padding: 10px 12px; font-size:12.5px; }
  td { padding: 9px 12px; border-bottom: 1px solid var(--border); color: var(--text-main); }
  tr:nth-child(even) td { background: rgba(255,255,255,0.02); }

  .badge { padding:4px 10px; border-radius: 20px; font-size: 11.5px; font-weight:600; }
  .badge-ok { background: rgba(20,184,166,.2); color:#3ddcc7; }
  .badge-warn { background: rgba(242,183,5,.2); color:#f2c94c; }
  .badge-danger { background: rgba(224,90,90,.2); color:#f28b8b; }
  .badge-grey { background: rgba(143,160,201,.2); color:#b9c6ea; }

  .toolbar { display:flex; justify-content:space-between; align-items:center; margin-bottom: 16px; gap: 10px; flex-wrap:wrap;}
  .search-input { flex:1; max-width: 320px; }

  .modal-overlay {
    display:none; position:fixed; inset:0; background: rgba(0,0,0,0.6);
    align-items:center; justify-content:center; z-index: 100;
  }
  .modal-overlay.active { display:flex; }
  .modal-box {
    background: var(--bg-panel); border:1px solid var(--border); border-radius: var(--radius);
    width: 720px; max-width: 92vw; max-height: 88vh; padding: 24px;
    display: flex; flex-direction: column; overflow: hidden;
  }
  .modal-box h2 { margin: 0 0 16px; font-size:18px; flex-shrink: 0; }
  .modal-scroll-area { overflow-y: auto; flex: 1; padding-right: 6px; margin-right: -6px; }
  .form-grid { display:grid; grid-template-columns: 1fr 1fr; gap: 0 16px; }
  .modal-actions {
    display:flex; justify-content:flex-end; gap: 10px; flex-shrink: 0;
    padding-top: 16px; margin-top: 12px; border-top: 1px solid var(--border);
  }

  .icon-btn { background:none; border:none; cursor:pointer; font-size:15px; color: var(--text-main); margin-right:6px;}
  .icon-btn:hover { color: var(--accent-light); }

  .chart-wrap { position:relative; }
  .donut-container {
    position: relative;
    width: 100%;
    max-width: 170px;
    height: 170px;
    margin: 0 auto;
  }
  @media (max-width: 640px){
    .donut-container { max-width: 140px; height: 140px; }
  }
  .qr-box {
    width:100%; min-height: 260px; border:1px solid var(--border); border-radius: var(--radius);
    display:flex; align-items:center; justify-content:center; background: var(--bg-input);
  }
  .qr-box img { max-width: 100%; max-height: 250px; border-radius: 6px; }
  .link-box { background: var(--bg-input); border:1px solid var(--border); border-radius:8px; padding:10px 14px; word-break:break-all; font-size:13px;}
  .link-box a { color: var(--accent-light); }

  ::-webkit-scrollbar { width: 8px; height:8px;}
  ::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px;}

  @media (max-width: 1100px){
    .dash-grid { grid-template-columns: 1fr; }
    .cards-row { flex-direction:row; flex-wrap:wrap; width:100%; }
    .stat-card { flex:1; min-width:140px; }
  }

  /* ===== TABLET & MOBILE ===== */
  @media (max-width: 900px){
    #hamburger-btn { display:inline-block; position:absolute; left:16px; top:50%; transform:translateY(-50%); }
    #topbar { font-size:19px; padding:16px 20px; }
    #sidebar {
      position: fixed; top:0; left:0; bottom:0; height:100%;
      transform: translateX(-100%);
      box-shadow: 4px 0 24px rgba(0,0,0,0.4);
    }
    #sidebar.open { transform: translateX(0); }
    #sidebar-overlay.open { display:block; }
    #content { padding: 16px; }
    .form-grid { grid-template-columns: 1fr; }
    .modal-box { padding: 18px; width: 96vw; }
  }

  @media (max-width: 640px){
    .login-box { width: 90vw; padding: 28px 20px; }
    #topbar { font-size:16px; }
    .stat-card .num { font-size: 24px; }
    .stat-card { min-width: 47%; }
    .filter-btn, .filter-select { font-size: 12.5px; padding: 7px 12px; }
    .toolbar { flex-direction: column; align-items: stretch; }
    .search-input { max-width: 100%; }
    th, td { padding: 8px 8px; font-size: 12.5px; }
  }