:root {
    --bg: #0a0c0f;
    --bg2: #111418;
    --bg3: #181d23;
    --border: #1e2530;
    --border2: #252d38;
    --text: #c8d4e0;
    --text2: #6b7f94;
    --text3: #3d4f61;
    --accent: #00d4ff;
    --accent2: #0099bb;
    --green: #00e5a0;
    --yellow: #f5c842;
    --red: #ff4d6a;
    --orange: #ff8c42;
    --mono: 'JetBrains Mono', monospace;
    --sans: 'Noto Sans SC', sans-serif;
  }

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

  body {
    background: var(--bg);
    color: var(--text);
    font-family: var(--sans);
    font-size: 14px;
    line-height: 1.6;
    min-height: 100vh;
  }

  /* HEADER */
  .header {
    border-bottom: 1px solid var(--border);
    padding: 20px 32px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: var(--bg2);
    position: sticky;
    top: 0;
    z-index: 100;
  }

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

  .logo {
    font-family: var(--mono);
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.2em;
    color: var(--accent);
    text-transform: uppercase;
    border: 1px solid var(--accent2);
    padding: 4px 10px;
  }

  .header-title {
    font-size: 15px;
    font-weight: 500;
    color: var(--text);
    letter-spacing: 0.02em;
  }

  .header-date {
    font-family: var(--mono);
    font-size: 11px;
    color: var(--text3);
    letter-spacing: 0.08em;
  }

  /* NAV TABS */
  .nav {
    display: flex;
    border-bottom: 1px solid var(--border);
    background: var(--bg2);
    padding: 0 32px;
    gap: 0;
  }

  .nav-tab {
    font-family: var(--mono);
    font-size: 11px;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text3);
    padding: 14px 20px;
    cursor: pointer;
    border-bottom: 2px solid transparent;
    transition: all 0.15s;
    user-select: none;
  }

  .nav-tab:hover { color: var(--text2); }
  .nav-tab.active {
    color: var(--accent);
    border-bottom-color: var(--accent);
  }

  /* MAIN LAYOUT */
  .main { padding: 28px 32px; max-width: 1400px; }

  .page { display: none; }
  .page.active { display: block; }

  /* SECTION HEADERS */
  .section-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
  }

  .section-label {
    font-family: var(--mono);
    font-size: 10px;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--text3);
  }

  .section-line {
    flex: 1;
    height: 1px;
    background: var(--border);
  }

  /* CARDS */
  .card {
    background: var(--bg2);
    border: 1px solid var(--border);
    padding: 20px;
    margin-bottom: 16px;
  }

  .card-title {
    font-family: var(--mono);
    font-size: 10px;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--text3);
    margin-bottom: 16px;
  }

  /* GRID */
  .grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
  .grid-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 16px; }
  .grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }

  /* STAT BOXES */
  .stat-box {
    background: var(--bg3);
    border: 1px solid var(--border);
    padding: 16px 20px;
    position: relative;
    overflow: hidden;
  }

  .stat-box::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 2px;
  }

  .stat-box.green::before { background: var(--green); }
  .stat-box.yellow::before { background: var(--yellow); }
  .stat-box.red::before { background: var(--red); }
  .stat-box.blue::before { background: var(--accent); }

  .stat-label {
    font-family: var(--mono);
    font-size: 9px;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--text3);
    margin-bottom: 8px;
  }

  .stat-value {
    font-family: var(--mono);
    font-size: 28px;
    font-weight: 700;
    line-height: 1;
  }

  .stat-value.green { color: var(--green); }
  .stat-value.yellow { color: var(--yellow); }
  .stat-value.red { color: var(--red); }
  .stat-value.blue { color: var(--accent); }

  .stat-sub {
    font-family: var(--mono);
    font-size: 10px;
    color: var(--text3);
    margin-top: 6px;
  }

  /* FORM ELEMENTS */
  .form-group { margin-bottom: 14px; }

  .form-label {
    font-family: var(--mono);
    font-size: 10px;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--text2);
    margin-bottom: 6px;
    display: block;
  }

  input, select, textarea {
    width: 100%;
    background: var(--bg3);
    border: 1px solid var(--border2);
    color: var(--text);
    padding: 9px 12px;
    font-family: var(--sans);
    font-size: 13px;
    outline: none;
    transition: border-color 0.15s;
    -webkit-appearance: none;
  }

  input:focus, select:focus, textarea:focus {
    border-color: var(--accent2);
  }

  textarea { resize: vertical; min-height: 80px; }

  select option { background: var(--bg3); }

  .form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
  .form-row-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 12px; }

  /* BUTTONS */
  .btn {
    font-family: var(--mono);
    font-size: 11px;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    padding: 10px 24px;
    cursor: pointer;
    border: none;
    transition: all 0.15s;
  }

  .btn-primary {
    background: var(--accent);
    color: var(--bg);
    font-weight: 700;
  }

  .btn-primary:hover { background: #33ddff; }

  .btn-ghost {
    background: transparent;
    border: 1px solid var(--border2);
    color: var(--text2);
  }

  .btn-ghost:hover { border-color: var(--text2); color: var(--text); }

  .btn-danger {
    background: transparent;
    border: 1px solid var(--red);
    color: var(--red);
  }

  .btn-danger:hover { background: var(--red); color: var(--bg); }

  /* TABLE */
  .table-wrap { overflow-x: auto; }

  table {
    width: 100%;
    border-collapse: collapse;
    font-size: 12px;
  }

  thead th {
    font-family: var(--mono);
    font-size: 9px;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--text3);
    text-align: left;
    padding: 10px 14px;
    border-bottom: 1px solid var(--border);
    white-space: nowrap;
  }

  tbody td {
    padding: 11px 14px;
    border-bottom: 1px solid var(--border);
    color: var(--text);
    vertical-align: top;
  }

  tbody tr:hover td { background: var(--bg3); }

  tbody tr:last-child td { border-bottom: none; }

  .mono { font-family: var(--mono); font-size: 11px; }

  /* BADGES */
  .badge {
    font-family: var(--mono);
    font-size: 9px;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    padding: 2px 8px;
    display: inline-block;
  }

  .badge-green { background: rgba(0,229,160,0.12); color: var(--green); border: 1px solid rgba(0,229,160,0.25); }
  .badge-yellow { background: rgba(245,200,66,0.12); color: var(--yellow); border: 1px solid rgba(245,200,66,0.25); }
  .badge-red { background: rgba(255,77,106,0.12); color: var(--red); border: 1px solid rgba(255,77,106,0.25); }
  .badge-blue { background: rgba(0,212,255,0.12); color: var(--accent); border: 1px solid rgba(0,212,255,0.25); }
  .badge-gray { background: rgba(107,127,148,0.12); color: var(--text2); border: 1px solid rgba(107,127,148,0.25); }
  .badge-orange { background: rgba(255,140,66,0.12); color: var(--orange); border: 1px solid rgba(255,140,66,0.25); }

  /* ASR BAR */
  .asr-bar-wrap { display: flex; align-items: center; gap: 10px; }
  .asr-bar-bg {
    flex: 1;
    height: 4px;
    background: var(--border2);
    position: relative;
    max-width: 120px;
  }
  .asr-bar-fill {
    position: absolute;
    top: 0; left: 0; bottom: 0;
    transition: width 0.3s;
  }

  /* INLINE ACTIONS */
  .action-btns { display: flex; gap: 8px; }

  .btn-sm {
    font-family: var(--mono);
    font-size: 9px;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    padding: 4px 10px;
    cursor: pointer;
    border: 1px solid var(--border2);
    background: transparent;
    color: var(--text3);
    transition: all 0.12s;
  }

  .btn-sm:hover { border-color: var(--text2); color: var(--text); }
  .btn-sm.del:hover { border-color: var(--red); color: var(--red); }
  .btn-sm:disabled { opacity: 0.3; cursor: not-allowed; pointer-events: none; }

  /* EMPTY STATE */
  .empty {
    text-align: center;
    padding: 48px 24px;
    color: var(--text3);
  }

  .empty-icon {
    font-size: 32px;
    margin-bottom: 12px;
    opacity: 0.4;
  }

  .empty-text {
    font-family: var(--mono);
    font-size: 11px;
    letter-spacing: 0.1em;
  }

  /* DIVIDER */
  .divider { height: 1px; background: var(--border); margin: 24px 0; }

  /* MODAL */
  .modal-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.75);
    z-index: 200;
    align-items: center;
    justify-content: center;
  }

  .modal-overlay.open { display: flex; }

  .modal {
    background: var(--bg2);
    border: 1px solid var(--border2);
    width: 640px;
    max-width: 95vw;
    max-height: 90vh;
    overflow-y: auto;
  }

  .modal-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
  }

  .modal-title {
    font-family: var(--mono);
    font-size: 11px;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--accent);
  }

  .modal-close {
    background: none;
    border: none;
    color: var(--text3);
    cursor: pointer;
    font-size: 18px;
    line-height: 1;
    padding: 0 4px;
  }

  .modal-close:hover { color: var(--text); }

  .modal-body { padding: 24px; }

  .modal-footer {
    padding: 16px 24px;
    border-top: 1px solid var(--border);
    display: flex;
    justify-content: flex-end;
    gap: 10px;
  }

  /* SUMMARY BOX */
  .summary-box {
    background: var(--bg3);
    border-left: 2px solid var(--accent);
    padding: 14px 18px;
    margin-bottom: 16px;
    font-size: 13px;
    color: var(--text2);
    line-height: 1.8;
  }

  /* CARRIER CARD */
  .carrier-card {
    background: var(--bg3);
    border: 1px solid var(--border);
    padding: 16px 20px;
    position: relative;
  }

  .carrier-name {
    font-size: 15px;
    font-weight: 500;
    margin-bottom: 8px;
  }

  .carrier-meta {
    font-family: var(--mono);
    font-size: 10px;
    color: var(--text3);
    margin-bottom: 12px;
    letter-spacing: 0.05em;
  }

  .carrier-provinces {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 12px;
  }

  .province-tag {
    font-family: var(--mono);
    font-size: 9px;
    padding: 2px 8px;
    border: 1px solid var(--border2);
    color: var(--text2);
  }

  .province-tag.good { border-color: rgba(0,229,160,0.4); color: var(--green); }
  .province-tag.bad { border-color: rgba(255,77,106,0.4); color: var(--red); }

  .carrier-actions {
    display: flex;
    gap: 8px;
    margin-top: 12px;
  }

  /* FAULT DICT ENTRY */
  .fault-entry {
    background: var(--bg3);
    border: 1px solid var(--border);
    padding: 16px 20px;
    margin-bottom: 12px;
  }

  .fault-symptom {
    font-weight: 500;
    margin-bottom: 8px;
    color: var(--yellow);
    font-size: 13px;
  }

  .fault-causes { margin-bottom: 10px; }

  .fault-cause-item {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    font-size: 12px;
    color: var(--text2);
    margin-bottom: 4px;
  }

  .cause-prob {
    font-family: var(--mono);
    font-size: 10px;
    color: var(--accent);
    min-width: 36px;
  }

  .fault-steps {
    font-size: 12px;
    color: var(--text2);
    border-left: 2px solid var(--border2);
    padding-left: 12px;
    line-height: 1.9;
  }

  /* WEEKLY REVIEW */
  .review-question {
    background: var(--bg3);
    border: 1px solid var(--border);
    padding: 16px 20px;
    margin-bottom: 12px;
  }

  .review-q {
    font-family: var(--mono);
    font-size: 10px;
    letter-spacing: 0.1em;
    color: var(--accent);
    margin-bottom: 10px;
    text-transform: uppercase;
  }

  /* SCROLL BAR */
  ::-webkit-scrollbar { width: 4px; height: 4px; }
  ::-webkit-scrollbar-track { background: var(--bg); }
  ::-webkit-scrollbar-thumb { background: var(--border2); }

  /* TOAST */
  .toast {
    position: fixed;
    bottom: 24px;
    right: 24px;
    background: var(--bg2);
    border: 1px solid var(--green);
    color: var(--green);
    font-family: var(--mono);
    font-size: 11px;
    letter-spacing: 0.08em;
    padding: 12px 20px;
    z-index: 999;
    opacity: 0;
    transform: translateY(8px);
    transition: all 0.2s;
    pointer-events: none;
  }

  .toast.show { opacity: 1; transform: translateY(0); }

  /* RATING STARS */
  .rating { display: flex; gap: 4px; }
  .star { font-size: 14px; cursor: pointer; }
  .star.on { color: var(--yellow); }
  .star.off { color: var(--border2); }

  /* EXCEL IMPORT */
  .import-panel {
    margin-top: 16px;
    border-top: 1px solid var(--border);
    padding-top: 16px;
  }

  .import-row {
    display: flex;
    gap: 10px;
    align-items: center;
    margin-bottom: 8px;
  }

  .import-row input[type="file"] {
    flex: 1;
    font-size: 12px;
    padding: 7px 10px;
  }

  .import-hint {
    font-family: var(--mono);
    font-size: 9px;
    color: var(--text3);
    letter-spacing: 0.06em;
  }

  @media (max-width: 900px) {
    .grid-4 { grid-template-columns: 1fr 1fr; }
    .grid-3 { grid-template-columns: 1fr 1fr; }
    .grid-2 { grid-template-columns: 1fr; }
    .main { padding: 20px 16px; }
    .header { padding: 16px; }
    .nav { padding: 0 16px; }
  }

  /* ===== LOGIN SCREEN ===== */
  #login-screen {
    display: none;
    position: fixed;
    inset: 0;
    background: var(--bg);
    z-index: 9999;
    align-items: center;
    justify-content: center;
  }
  #login-screen.show { display: flex; }
  .login-box {
    background: var(--bg2);
    border: 1px solid var(--border2);
    padding: 48px 40px;
    width: 360px;
    max-width: 90vw;
  }
  .login-logo {
    font-family: var(--mono);
    font-size: 28px;
    font-weight: 700;
    color: var(--accent);
    letter-spacing: 0.1em;
    margin-bottom: 6px;
  }
  .login-subtitle {
    font-size: 12px;
    color: var(--text3);
    letter-spacing: 0.08em;
    margin-bottom: 36px;
  }
  .login-field { margin-bottom: 18px; }
  .login-label {
    font-family: var(--mono);
    font-size: 9px;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--text3);
    margin-bottom: 8px;
  }
  .login-input {
    width: 100%;
    background: var(--bg3);
    border: 1px solid var(--border2);
    color: var(--text);
    padding: 10px 12px;
    font-size: 13px;
    font-family: var(--mono);
    outline: none;
    box-sizing: border-box;
    transition: border-color 0.15s;
  }
  .login-input:focus { border-color: var(--accent); }
  .login-btn {
    width: 100%;
    background: var(--accent);
    color: #000;
    border: none;
    padding: 11px;
    font-size: 13px;
    font-weight: 700;
    font-family: var(--mono);
    letter-spacing: 0.08em;
    cursor: pointer;
    margin-top: 8px;
    transition: opacity 0.15s;
  }
  .login-btn:hover { opacity: 0.85; }
  .login-btn:disabled { opacity: 0.4; cursor: not-allowed; }
  .login-error {
    font-size: 11px;
    color: var(--red);
    margin-top: 12px;
    min-height: 16px;
    font-family: var(--mono);
  }

  /* ===== LOGOUT BUTTON ===== */
  .nav-user {
    margin-left: auto;
    display: flex;
    align-items: center;
    gap: 10px;
    padding-right: 24px;
  }
  .nav-username {
    font-family: var(--mono);
    font-size: 10px;
    color: var(--text3);
    letter-spacing: 0.08em;
  }
  .btn-logout {
    font-family: var(--mono);
    font-size: 10px;
    color: var(--text3);
    background: none;
    border: 1px solid var(--border2);
    padding: 4px 10px;
    cursor: pointer;
    letter-spacing: 0.06em;
    transition: color 0.15s, border-color 0.15s;
  }
  .btn-logout:hover { color: var(--red); border-color: var(--red); }