:root {
    --bg: #0a0c10;
    --surface: #111418;
    --surface2: #181c22;
    --border: #1e2530;
    --green: #00ff88;
    --green2: #00cc6a;
    --amber: #ffaa00;
    --red: #ff4455;
    --blue: #4499ff;
    --cyan: #00ddff;
    --text: #c8d8e8;
    --muted: #5a7080;
    --font-mono: 'Share Tech Mono', monospace;
    --font-display: 'Orbitron', sans-serif;
    --font-body: 'Barlow', sans-serif;
  }

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

  body {
    background: var(--bg);
    color: var(--text);
    font-family: var(--font-body);
    font-weight: 300;
    min-height: 100vh;
    overflow-x: hidden;
  }

  /* Scanline overlay */
  body::before {
    content: '';
    position: fixed;
    inset: 0;
    background: repeating-linear-gradient(
      to bottom,
      transparent 0px,
      transparent 2px,
      rgba(0,0,0,0.07) 2px,
      rgba(0,0,0,0.07) 4px
    );
    pointer-events: none;
    z-index: 9999;
  }

  /* ─── HEADER ─── */
  header {
    position: relative;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    padding: 0 2rem;
    overflow: hidden;
  }

  header::after {
    content: '';
    position: absolute;
    bottom: 0; left: 0; right: 0;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--green), var(--cyan), transparent);
    animation: scanH 4s linear infinite;
  }

  @keyframes scanH {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
  }

  .header-inner {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.5rem 0;
    gap: 2rem;
    flex-wrap: wrap;
  }

  .callsign-block {
    display: flex;
    align-items: baseline;
    gap: 1rem;
  }

  .callsign {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 900;
    color: var(--green);
    text-shadow: 0 0 30px rgba(0,255,136,0.5), 0 0 60px rgba(0,255,136,0.2);
    letter-spacing: 0.05em;
    line-height: 1;
  }

  .op-name {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--muted);
    letter-spacing: 0.15em;
  }

  .header-status {
    display: flex;
    gap: 2rem;
    flex-wrap: wrap;
  }

  .status-item {
    text-align: center;
  }

  .status-val {
    font-family: var(--font-display);
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--amber);
    text-shadow: 0 0 20px rgba(255,170,0,0.4);
    display: block;
  }

  .status-lbl {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    color: var(--muted);
    letter-spacing: 0.2em;
    text-transform: uppercase;
  }

  .online-badge {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--green);
    padding: 0.4rem 1rem;
    border: 1px solid var(--green);
    border-radius: 2px;
    background: rgba(0,255,136,0.05);
    letter-spacing: 0.1em;
  }

  .pulse-dot {
    width: 8px; height: 8px;
    border-radius: 50%;
    background: var(--green);
    box-shadow: 0 0 8px var(--green);
    animation: pulse 1.5s ease-in-out infinite;
  }

  @keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.4; transform: scale(0.7); }
  }

  /* ─── NAV ─── */
  nav {
    background: var(--surface2);
    border-bottom: 1px solid var(--border);
  }

  .nav-inner {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    gap: 0;
    padding: 0 2rem;
  }

  .nav-btn {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--muted);
    padding: 0.9rem 1.5rem;
    background: none;
    border: none;
    border-bottom: 2px solid transparent;
    cursor: pointer;
    transition: all 0.2s;
    white-space: nowrap;
  }

  .nav-btn:hover { color: var(--text); }
  .nav-btn.active { color: var(--green); border-bottom-color: var(--green); }

  /* ─── MAIN ─── */
  main {
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem;
  }

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

  /* ─── DASHBOARD ─── */
  .dash-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
  }

  .card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 1.5rem;
    position: relative;
    overflow: hidden;
  }

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

  .card.green::before { background: linear-gradient(90deg, var(--green), transparent); }
  .card.amber::before { background: linear-gradient(90deg, var(--amber), transparent); }
  .card.blue::before { background: linear-gradient(90deg, var(--blue), transparent); }
  .card.cyan::before { background: linear-gradient(90deg, var(--cyan), transparent); }
  .card.red::before { background: linear-gradient(90deg, var(--red), transparent); }

  .card-title {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    letter-spacing: 0.2em;
    color: var(--muted);
    text-transform: uppercase;
    margin-bottom: 1rem;
  }

  .bar-chart { display: flex; flex-direction: column; gap: 0.5rem; }

  .bar-row {
    display: grid;
    grid-template-columns: 80px 1fr 40px;
    align-items: center;
    gap: 0.5rem;
  }

  .bar-label {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text);
    text-align: right;
  }

  .bar-track {
    height: 16px;
    background: var(--surface2);
    border-radius: 2px;
    overflow: hidden;
    position: relative;
  }

  .bar-fill {
    height: 100%;
    border-radius: 2px;
    transition: width 1s cubic-bezier(0.4,0,0.2,1);
  }

  .bar-count {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--muted);
  }

  .country-list {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
    max-height: 220px;
    overflow-y: auto;
  }

  .country-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.3rem 0;
    border-bottom: 1px solid var(--border);
    font-family: var(--font-mono);
    font-size: 0.75rem;
  }

  .country-name { color: var(--text); }
  .country-count {
    color: var(--amber);
    background: rgba(255,170,0,0.1);
    padding: 0.1rem 0.4rem;
    border-radius: 2px;
    font-size: 0.7rem;
  }

  /* ─── ACTIVITY CHART ─── */
  .activity-card { grid-column: 1 / -1; }

  #activityCanvas {
    width: 100%;
    height: 120px;
    display: block;
  }

  /* ─── LOGBOOK TABLE ─── */
  .log-controls {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
    align-items: center;
  }

  .search-input {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 2px;
    color: var(--text);
    padding: 0.5rem 1rem;
    flex: 1;
    min-width: 200px;
    outline: none;
    transition: border-color 0.2s;
  }

  .search-input:focus { border-color: var(--green); }
  .search-input::placeholder { color: var(--muted); }

  .filter-select {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 2px;
    color: var(--text);
    padding: 0.5rem 0.75rem;
    outline: none;
    cursor: pointer;
  }

  .filter-select option { background: var(--surface2); }

  .log-meta {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--muted);
    margin-left: auto;
    white-space: nowrap;
  }

  .table-wrap {
    overflow-x: auto;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 4px;
  }

  table {
    width: 100%;
    border-collapse: collapse;
    font-family: var(--font-mono);
    font-size: 0.8rem;
  }

  thead th {
    background: var(--surface2);
    padding: 0.75rem 1rem;
    text-align: left;
    color: var(--muted);
    letter-spacing: 0.15em;
    font-size: 0.7rem;
    text-transform: uppercase;
    border-bottom: 1px solid var(--border);
    white-space: nowrap;
    cursor: pointer;
    user-select: none;
    transition: color 0.2s;
  }

  thead th:hover { color: var(--green); }
  thead th.sort-asc::after { content: ' ▲'; font-size: 0.6rem; }
  thead th.sort-desc::after { content: ' ▼'; font-size: 0.6rem; }

  tbody tr {
    border-bottom: 1px solid rgba(30,37,48,0.5);
    transition: background 0.15s;
  }

  tbody tr:hover { background: rgba(0,255,136,0.03); }

  tbody td {
    padding: 0.6rem 1rem;
    color: var(--text);
    white-space: nowrap;
  }

  .call-cell {
    color: var(--cyan);
    font-weight: 700;
    font-size: 0.9rem;
    letter-spacing: 0.05em;
  }

  .band-badge {
    display: inline-block;
    padding: 0.15rem 0.5rem;
    border-radius: 2px;
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.05em;
  }

  .band-20M, .band-20m { background: rgba(68,153,255,0.15); color: var(--blue); }
  .band-40M, .band-40m { background: rgba(0,255,136,0.12); color: var(--green); }
  .band-80M, .band-80m { background: rgba(255,68,85,0.12); color: var(--red); }
  .band-10M, .band-10m { background: rgba(0,221,255,0.12); color: var(--cyan); }
  .band-default { background: rgba(90,112,128,0.2); color: var(--muted); }

  .mode-cell { color: var(--amber); font-size: 0.75rem; letter-spacing: 0.1em; }

  .lotw-y { color: var(--green); }
  .lotw-n { color: var(--muted); }

  .rst-cell { color: var(--text); font-size: 0.75rem; }

  .dist-cell { color: var(--muted); font-size: 0.75rem; }

  /* Pagination */
  .pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    margin-top: 1.5rem;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    flex-wrap: wrap;
  }

  .page-btn {
    background: var(--surface);
    border: 1px solid var(--border);
    color: var(--text);
    padding: 0.4rem 0.8rem;
    border-radius: 2px;
    cursor: pointer;
    transition: all 0.2s;
  }

  .page-btn:hover { border-color: var(--green); color: var(--green); }
  .page-btn.active { background: rgba(0,255,136,0.1); border-color: var(--green); color: var(--green); }
  .page-btn:disabled { opacity: 0.3; cursor: not-allowed; }

  .page-info { color: var(--muted); padding: 0.4rem 0.5rem; }

  /* ─── ABOUT ─── */
  .about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
  }

  @media (max-width: 768px) {
    .about-grid { grid-template-columns: 1fr; }
  }

  .info-block { margin-bottom: 1.5rem; }

  .info-label {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    letter-spacing: 0.2em;
    color: var(--muted);
    text-transform: uppercase;
    margin-bottom: 0.3rem;
  }

  .info-value {
    font-family: var(--font-body);
    font-size: 1.1rem;
    color: var(--text);
    font-weight: 600;
  }

  .info-value a { color: var(--cyan); text-decoration: none; }
  .info-value a:hover { text-decoration: underline; }

  .tag-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 0.5rem;
  }

  .tag {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    letter-spacing: 0.1em;
    padding: 0.3rem 0.7rem;
    border: 1px solid var(--border);
    border-radius: 2px;
    color: var(--text);
    background: var(--surface2);
  }

  /* ─── SCROLLBAR ─── */
  ::-webkit-scrollbar { width: 6px; height: 6px; }
  ::-webkit-scrollbar-track { background: var(--surface2); }
  ::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
  ::-webkit-scrollbar-thumb:hover { background: var(--muted); }

  /* ─── FOOTER ─── */
  footer {
    text-align: center;
    padding: 2rem;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--muted);
    border-top: 1px solid var(--border);
    margin-top: 3rem;
    letter-spacing: 0.15em;
  }

  footer span { color: var(--green); }

  /* ─── LOADING ─── */
  .loading {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 3rem;
    gap: 0.5rem;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--muted);
  }

  .spinner {
    width: 16px; height: 16px;
    border: 2px solid var(--border);
    border-top-color: var(--green);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
  }

  @keyframes spin { to { transform: rotate(360deg); } }

  @media (max-width: 600px) {
    .header-inner { padding: 1rem 0; }
    .callsign { font-size: 2rem; }
    .status-val { font-size: 1.2rem; }
    main { padding: 1rem; }
    .log-controls { gap: 0.5rem; }
    .nav-btn { padding: 0.75rem 1rem; font-size: 0.7rem; }
  }