:root {
  --bg: #0d1117;
  --bg2: #161b22;
  --bg3: #21262d;
  --border: #30363d;
  --text: #e6edf3;
  --text2: #8b949e;
  --accent: #58a6ff;
  --accent2: #3fb950;
  --danger: #f85149;
  --warn: #d29922;
  --radius: 6px;
  --sidebar-w: 240px;
  --font: 'Segoe UI', system-ui, -apple-system, sans-serif;
  --font-mono: 'Cascadia Code', 'Consolas', monospace;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; background: var(--bg); color: var(--text); font-family: var(--font); font-size: 14px; overflow: hidden; }

/* ── App layout ── */
#app {
  display: grid;
  grid-template-rows: 48px 1fr 28px;
  grid-template-columns: var(--sidebar-w) 1fr;
  height: 100vh;
}

/* ── Header ── */
header {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 0 20px;
  background: var(--bg2);
  border-bottom: 1px solid var(--border);
}

header h1 { font-size: 16px; font-weight: 600; color: var(--accent); }

#server-status {
  font-size: 12px;
  padding: 2px 10px;
  border-radius: 12px;
  font-weight: 500;
  background: #1a3a1f; color: var(--accent2); border: 1px solid #2ea04380;
}

.hackrf-badge {
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 10px;
  font-weight: 500;
}
.hackrf-badge.ok         { background: #1a3a1f; color: var(--accent2); border: 1px solid #2ea04380; }
.hackrf-badge.error      { background: #3a1a1a; color: var(--danger);  border: 1px solid #f8514980; }
.hackrf-badge.connecting { background: #2a2a1a; color: var(--warn);    border: 1px solid #d2992280; }

nav { display: flex; gap: 4px; margin-left: 16px; }
nav button {
  background: none; border: 1px solid transparent; color: var(--text2);
  padding: 4px 14px; border-radius: var(--radius); cursor: pointer; font-size: 13px;
  transition: all 0.15s;
}
nav button:hover { color: var(--text); background: var(--bg3); }
nav button.active { color: var(--accent); border-color: var(--accent); background: #0d2044; }

/* ── Sidebar ── */
#sidebar {
  border-right: 1px solid var(--border);
  background: var(--bg2);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

#sidebar-header {
  padding: 12px 14px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-shrink: 0;
}

#sidebar-header span { font-size: 11px; font-weight: 600; text-transform: uppercase; letter-spacing: 0.06em; color: var(--text2); }

#btn-add-device {
  background: var(--accent); border: none; color: #fff; border-radius: var(--radius);
  padding: 3px 10px; font-size: 12px; cursor: pointer; transition: opacity 0.15s;
}
#btn-add-device:hover { opacity: 0.85; }

#device-list {
  flex: 1;
  overflow-y: auto;
  padding: 6px 0;
}

.device-item {
  padding: 10px 14px;
  cursor: pointer;
  border-left: 3px solid transparent;
  transition: all 0.12s;
  display: flex;
  flex-direction: column;
  gap: 3px;
}
.device-item:hover { background: var(--bg3); }
.device-item.active { background: #0d2044; border-left-color: var(--accent); }

.device-name { font-size: 13px; font-weight: 500; }
.device-meta { font-size: 11px; color: var(--text2); display: flex; align-items: center; gap: 6px; }

.dot { width: 7px; height: 7px; border-radius: 50%; flex-shrink: 0; }
.dot.online { background: var(--accent2); box-shadow: 0 0 6px #3fb95066; }
.dot.offline { background: var(--danger); }
.dot.unknown { background: var(--text2); }

.device-hackrf { font-size: 10px; color: var(--danger); font-weight: 500; white-space: nowrap; }

/* ── Main panel ── */
#main-panel {
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.view { display: none; flex-direction: column; height: 100%; }
.view.active { display: flex; }

/* ── Spectrum ── */
#spectrum-view { padding: 12px 16px; gap: 8px; }
.chart-toolbar { display: flex; align-items: center; gap: 12px; flex-shrink: 0; font-size: 12px; color: var(--text2); }
.chart-toolbar label { display: flex; align-items: center; gap: 6px; }
.chart-toolbar input[type=checkbox] { accent-color: var(--accent); }
.chart-toolbar input[type=number] {
  background: var(--surface2); border: 1px solid var(--border); border-radius: 4px;
  color: var(--text1); font-size: 12px; padding: 2px 4px;
}
.chart-toolbar input[type=number]:focus { outline: none; border-color: var(--accent); }
.toolbar-sep { width: 1px; height: 16px; background: var(--border); flex-shrink: 0; }
#spectrum-container { flex: 1; min-height: 0; position: relative; }

.uplot { height: 100% !important; }
.u-wrap { height: 100% !important; position: relative; }

.u-legend {
  position: absolute !important;
  top: 6px;
  left: 60px;
  z-index: 10;
  background: rgba(13,17,23,0.82);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 4px 10px;
  backdrop-filter: blur(4px);
  pointer-events: none;
}
.u-legend tr { display: inline-flex; align-items: center; gap: 10px; }
.u-legend th { font-size: 11px; color: var(--text2); font-family: var(--font-mono); white-space: nowrap; }
.u-legend td { font-size: 11px; font-family: var(--font-mono); color: var(--text); white-space: nowrap; }
.u-marker { width: 10px !important; height: 3px !important; border-radius: 2px; }

/* ── Waterfall ── */
#waterfall-view { padding: 12px 16px; gap: 8px; }
#waterfall-toolbar { display: flex; align-items: center; gap: 16px; flex-shrink: 0; font-size: 12px; color: var(--text2); }
#waterfall-canvas-wrap {
  flex: 1; min-height: 0; position: relative; background: #000;
  border-radius: var(--radius); overflow: hidden;
}
#waterfall-canvas { width: 100%; height: 100%; display: block; }
#freq-axis {
  position: absolute; bottom: 0; left: 0; right: 0; height: 20px;
  display: flex; justify-content: space-between; padding: 0 4px;
  font-size: 10px; color: rgba(255,255,255,0.5); pointer-events: none;
  background: linear-gradient(transparent, rgba(0,0,0,0.5));
}

/* ── Settings (device config) ── */
#settings-view { padding: 24px; overflow-y: auto; align-items: flex-start; gap: 16px; }

.settings-card {
  background: var(--bg2); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 20px; width: 100%; max-width: 560px;
}
.settings-card h2 {
  font-size: 14px; font-weight: 600; margin-bottom: 16px;
  border-bottom: 1px solid var(--border); padding-bottom: 10px;
}

.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.form-group { display: flex; flex-direction: column; gap: 5px; }
.form-group.full { grid-column: 1 / -1; }
.form-group label { font-size: 12px; color: var(--text2); font-weight: 500; }
.form-group input, .form-group select {
  background: var(--bg3); border: 1px solid var(--border); border-radius: var(--radius);
  color: var(--text); padding: 7px 10px; font-size: 13px; font-family: var(--font);
  outline: none; transition: border-color 0.15s;
}
.form-group input:focus, .form-group select:focus { border-color: var(--accent); }
.form-group input[type=checkbox] { width: 16px; height: 16px; accent-color: var(--accent); }

.form-actions { display: flex; gap: 8px; margin-top: 18px; justify-content: flex-end; }

button.btn-primary {
  background: var(--accent); color: #fff; border: none; border-radius: var(--radius);
  padding: 7px 18px; font-size: 13px; cursor: pointer; font-weight: 500; transition: opacity 0.15s;
}
button.btn-primary:hover { opacity: 0.85; }

button.btn-secondary {
  background: var(--bg3); color: var(--text); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 7px 18px; font-size: 13px; cursor: pointer;
  transition: border-color 0.15s;
}
button.btn-secondary:hover { border-color: var(--accent); }

button.btn-danger {
  background: none; color: var(--danger); border: 1px solid var(--danger);
  border-radius: var(--radius); padding: 7px 18px; font-size: 13px; cursor: pointer;
  transition: opacity 0.15s;
}
button.btn-danger:hover { opacity: 0.75; }

#settings-msg { margin-top: 10px; font-size: 12px; min-height: 18px; }
#settings-msg.ok { color: var(--accent2); }
#settings-msg.error { color: var(--danger); }

/* ── Devices view ── */
#devices-view { padding: 20px; overflow-y: auto; align-items: flex-start; gap: 12px; }
#devices-view h2 { font-size: 16px; font-weight: 600; margin-bottom: 8px; }

.device-card {
  background: var(--bg2); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 16px; width: 100%; max-width: 480px; display: flex; flex-direction: column; gap: 10px;
}
.device-card-header { display: flex; align-items: center; gap: 8px; }
.device-card-header .device-name { font-size: 15px; font-weight: 600; flex: 1; }
.device-card-meta { font-size: 12px; color: var(--text2); font-family: var(--font-mono); }
.device-card-actions { display: flex; gap: 8px; margin-top: 4px; }

/* ── Users panel ── */
.users-panel h3 { font-size: 13px; font-weight: 600; color: var(--text2); text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: 10px; }
.users-table { width: 100%; border-collapse: collapse; font-size: 13px; }
.users-table th { padding: 6px 10px; text-align: left; font-size: 11px; font-weight: 600; text-transform: uppercase; letter-spacing: 0.05em; color: var(--text2); border-bottom: 1px solid var(--border); }
.users-table td { padding: 8px 10px; border-bottom: 1px solid var(--border); vertical-align: middle; }
.users-table tr:last-child td { border-bottom: none; }
.users-table tr:hover td { background: var(--bg3); }
.user-name { font-family: var(--font-mono); font-size: 13px; }
.you-badge { font-size: 10px; background: #1a2a3a; color: var(--accent); border: 1px solid #58a6ff40; border-radius: 8px; padding: 1px 6px; margin-left: 4px; }
.user-actions { display: flex; gap: 6px; }
.btn-sm { padding: 4px 10px !important; font-size: 12px !important; }
.inline-select { background: var(--bg3); border: 1px solid var(--border); border-radius: var(--radius); color: var(--text); padding: 4px 8px; font-size: 12px; cursor: pointer; }
.inline-select:disabled { opacity: 0.5; cursor: default; }
.add-user-form .form-row { display: grid; grid-template-columns: 1fr 1fr 120px; gap: 12px; }

/* ── Auth modal ── */
#auth-overlay {
  display: none;
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.75);
  align-items: center; justify-content: center;
  z-index: 200;
  backdrop-filter: blur(3px);
}
#auth-overlay.open { display: flex; }

#auth-modal {
  background: var(--bg2); border: 1px solid var(--border); border-radius: 10px;
  padding: 28px 32px; width: 360px; display: flex; flex-direction: column; gap: 14px;
}
#auth-modal h2 { font-size: 17px; font-weight: 600; text-align: center; }
.auth-input-group { display: flex; flex-direction: column; gap: 5px; }
.auth-input-group label { font-size: 12px; color: var(--text2); }
.auth-input-group input {
  background: var(--bg3); border: 1px solid var(--border); border-radius: var(--radius);
  color: var(--text); padding: 9px 12px; font-size: 14px; outline: none;
  transition: border-color 0.15s;
}
.auth-input-group input:focus { border-color: var(--accent); }
.auth-error { color: var(--danger); font-size: 12px; text-align: center; min-height: 16px; }

#role-badge {
  font-size: 11px; padding: 2px 8px; border-radius: 10px; font-weight: 500;
}
body[data-role="admin"] #role-badge { background: #1a2a3a; color: var(--accent); border: 1px solid #58a6ff40; cursor: pointer; }
body[data-role="user"] #role-badge  { background: #1a3a1a; color: var(--accent2); border: 1px solid #3fb95040; cursor: default; }

.btn-admin-switch {
  font-size: 11px; padding: 2px 10px; border-radius: 10px; font-weight: 500;
  background: transparent; border: 1px solid var(--accent); color: var(--accent);
  cursor: pointer; transition: background 0.15s, color 0.15s;
}
.btn-admin-switch:hover { background: var(--accent); color: #fff; }

body[data-role="user"] [data-role="admin"] { display: none !important; }

/* ── Add device modal ── */
#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.open { display: flex; }

#modal {
  background: var(--bg2); border: 1px solid var(--border); border-radius: 8px;
  padding: 24px; width: 380px; display: flex; flex-direction: column; gap: 14px;
}
#modal h3 { font-size: 15px; font-weight: 600; }
#modal-close { margin-left: auto; background: none; border: none; color: var(--text2); font-size: 18px; cursor: pointer; }
#modal-close:hover { color: var(--text); }

/* ── Edit device modal ── */
#edit-modal-overlay {
  display: none;
  position: fixed; inset: 0; background: rgba(0,0,0,0.6);
  align-items: center; justify-content: center; z-index: 100;
}
#edit-modal-overlay.open { display: flex; }
#edit-modal {
  background: var(--bg2); border: 1px solid var(--border); border-radius: 8px;
  padding: 24px; width: 380px; display: flex; flex-direction: column; gap: 14px;
}
#edit-modal h3 { font-size: 15px; font-weight: 600; }
#edit-modal-close { background: none; border: none; color: var(--text2); font-size: 18px; cursor: pointer; }
#edit-modal-close:hover { color: var(--text); }
#edit-modal input:disabled { opacity: 0.45; cursor: default; }
#edit-modal-msg.error { color: var(--danger); }
#edit-modal-msg.ok    { color: var(--accent2); }

/* ── No device placeholder ── */
#no-device {
  flex: 1; display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 12px; color: var(--text2);
}
#no-device svg { opacity: 0.3; }
#no-device p { font-size: 14px; }

/* ── Info bar ── */
#info-bar {
  grid-column: 1 / -1;
  padding: 4px 20px;
  background: var(--bg2); border-top: 1px solid var(--border);
  display: flex; gap: 20px; font-size: 11px; color: var(--text2); font-family: var(--font-mono);
}
#info-bar span { white-space: nowrap; }