:root {
  --bg: #0f172a;
  --bg-card: #1e293b;
  --bg-card-hover: #273449;
  --border: #334155;
  --text: #e2e8f0;
  --text-dim: #94a3b8;
  --accent: #60a5fa;
  --accent-strong: #3b82f6;
  --on: #22c55e;
  --on-glow: rgba(34, 197, 94, 0.35);
  --off: #475569;
  --offline: #6b7280;
  --error: #ef4444;
  --error-bg: rgba(239, 68, 68, 0.12);
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 4px 20px rgba(0, 0, 0, 0.35);
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

#app { flex: 1; display: flex; flex-direction: column; }

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1rem;
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
}
.brand { font-weight: 600; letter-spacing: 0.02em; }
.user-info { display: flex; align-items: center; gap: 0.75rem; font-size: 0.9rem; color: var(--text-dim); }

.role-badge {
  font-size: 0.7rem;
  font-weight: 600;
  padding: 0.15rem 0.5rem;
  border-radius: 999px;
  background: var(--accent-strong);
  color: white;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.link-btn {
  background: none;
  border: none;
  color: var(--accent);
  cursor: pointer;
  font: inherit;
  padding: 0.25rem 0.5rem;
}
.link-btn:hover { color: var(--accent-strong); }

.login-screen {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem 1rem;
}
.login-card { width: 100%; max-width: 380px; }
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem 1.5rem;
  box-shadow: var(--shadow);
}
.card h1 {
  margin: 0 0 1.5rem;
  font-weight: 600;
  font-size: 1.4rem;
  text-align: center;
}

form label { display: block; margin-bottom: 1rem; }
form label > span {
  display: block;
  margin-bottom: 0.4rem;
  font-size: 0.85rem;
  color: var(--text-dim);
}
form input[type="text"],
form input[type="password"] {
  width: 100%;
  padding: 0.7rem 0.9rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg);
  color: var(--text);
  font-size: 1rem;
  font-family: inherit;
  transition: border-color 0.15s;
}
form input:focus {
  outline: none;
  border-color: var(--accent);
}

button[type="submit"] {
  width: 100%;
  padding: 0.8rem;
  background: var(--accent-strong);
  color: white;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-weight: 500;
  font-family: inherit;
  cursor: pointer;
  margin-top: 0.5rem;
  transition: background 0.15s, transform 0.05s;
}
button[type="submit"]:hover { background: var(--accent); }
button[type="submit"]:active { transform: scale(0.98); }
button[type="submit"]:disabled { opacity: 0.6; cursor: not-allowed; }

.error {
  margin-top: 1rem;
  padding: 0.7rem 0.9rem;
  background: var(--error-bg);
  border: 1px solid var(--error);
  color: var(--error);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
}

.tabs {
  display: flex;
  gap: 0.25rem;
  padding: 0 1rem;
  border-bottom: 1px solid var(--border);
  background: var(--bg-card);
  position: sticky;
  top: 49px;
  z-index: 9;
}
.tab-btn {
  background: none;
  border: none;
  color: var(--text-dim);
  padding: 0.7rem 1rem;
  font: inherit;
  font-size: 0.9rem;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  transition: color 0.15s, border-color 0.15s;
}
.tab-btn:hover { color: var(--text); }
.tab-btn.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.dashboard, .users-page { padding: 1.25rem 1rem 4rem; max-width: 960px; width: 100%; margin: 0 auto; }
.dashboard-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.25rem;
}
.dashboard-header h2 { margin: 0; font-weight: 600; font-size: 1.2rem; }
.dashboard-actions { display: flex; align-items: center; gap: 1rem; }

.primary-btn {
  background: var(--accent-strong);
  color: white;
  border: none;
  border-radius: var(--radius-sm);
  padding: 0.55rem 0.9rem;
  font: inherit;
  font-weight: 500;
  font-size: 0.9rem;
  cursor: pointer;
  transition: background 0.15s, transform 0.05s;
}
.primary-btn:hover { background: var(--accent); }
.primary-btn:active { transform: scale(0.98); }
.primary-btn:disabled { opacity: 0.6; cursor: not-allowed; }
.primary-btn.danger { background: var(--error); }
.primary-btn.danger:hover { background: #dc2626; }

.ghost-btn {
  background: transparent;
  color: var(--text-dim);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.55rem 0.9rem;
  font: inherit;
  font-size: 0.9rem;
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s;
}
.ghost-btn:hover { color: var(--text); border-color: var(--text-dim); }

.ws-status {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--text-dim);
}
.ws-status .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--off);
  transition: background 0.2s;
}
.ws-status[data-state="connecting"] .dot { background: #f59e0b; animation: pulse 1.4s ease-in-out infinite; }
.ws-status[data-state="open"] .dot { background: var(--on); }
.ws-status[data-state="closed"] .dot { background: var(--error); }
@keyframes pulse { 0%, 100% { opacity: 0.5; } 50% { opacity: 1; } }

.device-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1rem;
}

.device-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.device-card[data-state="on"] {
  border-color: var(--on);
  box-shadow: 0 0 0 1px var(--on), 0 0 24px var(--on-glow);
}
.device-card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
}
.device-card .label {
  margin: 0;
  font-weight: 600;
  font-size: 1rem;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.status-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--offline);
  flex-shrink: 0;
  position: relative;
}
.status-dot[data-online="true"] {
  background: var(--on);
  box-shadow: 0 0 6px var(--on-glow);
}
.status-dot[data-online="true"]::after {
  content: '';
  position: absolute;
  inset: -3px;
  border-radius: 50%;
  border: 1px solid var(--on);
  opacity: 0.6;
  animation: dot-pulse 2s ease-out infinite;
}
@keyframes dot-pulse {
  0%   { transform: scale(0.8); opacity: 0.7; }
  80%  { transform: scale(1.7); opacity: 0; }
  100% { transform: scale(1.7); opacity: 0; }
}

.online-text {
  font-weight: 500;
}
.online-text[data-online="true"]  { color: var(--on); }
.online-text[data-online="false"] { color: var(--text-dim); }

.card-head-right {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-shrink: 0;
}
.card-icon-btn {
  background: transparent;
  border: none;
  color: var(--text-dim);
  font-size: 0.95rem;
  line-height: 1;
  padding: 0.25rem 0.4rem;
  border-radius: 6px;
  cursor: pointer;
  transition: color 0.15s, background 0.15s;
}
.card-icon-btn:hover { color: var(--error); background: var(--error-bg); }
.card-icon-btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }

.toggle-btn {
  padding: 1.4rem 1rem;
  border: none;
  border-radius: var(--radius-sm);
  background: var(--off);
  color: var(--text);
  font-size: 1rem;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  transition: background 0.15s, transform 0.05s;
}
.toggle-btn:hover { filter: brightness(1.1); }
.toggle-btn:active { transform: scale(0.98); }
.toggle-btn[aria-pressed="true"] { background: var(--on); }
.toggle-btn:disabled { opacity: 0.5; cursor: not-allowed; }

.meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8rem;
  color: var(--text-dim);
}
.meta .last-seen { margin-left: auto; }

.empty {
  text-align: center;
  padding: 3rem 1rem;
  color: var(--text-dim);
}

.users-table {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.user-row {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.85rem 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}
.user-row .user-main { flex: 1; min-width: 0; }
.user-row .user-username {
  font-weight: 600;
  font-size: 0.95rem;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.user-row .user-meta {
  font-size: 0.78rem;
  color: var(--text-dim);
  margin-top: 0.15rem;
}
.user-row .role-tag {
  padding: 0.1rem 0.5rem;
  border-radius: 999px;
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  background: var(--border);
  color: var(--text-dim);
}
.user-row .role-tag[data-role="admin"] {
  background: var(--accent-strong);
  color: white;
}
.user-row.is-self {
  border-color: var(--accent);
}

.share-list {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  max-height: 320px;
  overflow-y: auto;
  padding: 0.25rem 0;
}
.share-row {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  padding: 0.55rem 0.7rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
}
.share-row:hover { border-color: var(--text-dim); }
.share-row input[type="checkbox"] {
  width: 18px;
  height: 18px;
  accent-color: var(--accent-strong);
  cursor: pointer;
}
.share-row.is-owner {
  opacity: 0.7;
  cursor: not-allowed;
}
.share-row .share-username { flex: 1; font-size: 0.9rem; }
.share-row .role-tag {
  padding: 0.1rem 0.45rem;
  border-radius: 999px;
  font-size: 0.65rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  background: var(--border);
  color: var(--text-dim);
}
.share-row .role-tag[data-role="admin"] {
  background: var(--accent-strong);
  color: white;
}
.share-empty {
  text-align: center;
  padding: 1.5rem 1rem;
  color: var(--text-dim);
  font-size: 0.9rem;
}

form select {
  width: 100%;
  padding: 0.7rem 0.9rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg);
  color: var(--text);
  font-size: 1rem;
  font-family: inherit;
}
form select:focus { outline: none; border-color: var(--accent); }

.modal {
  border: none;
  background: transparent;
  padding: 0;
  max-width: 480px;
  width: calc(100% - 2rem);
  color: var(--text);
}
.modal::backdrop {
  background: rgba(0, 0, 0, 0.65);
  backdrop-filter: blur(2px);
}
.modal-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow);
  animation: modal-in 0.18s ease-out;
}
.modal-stage h3 {
  margin: 0 0 1rem;
  font-size: 1.1rem;
  font-weight: 600;
}
.modal-warn {
  margin: 0 0 1rem;
  padding: 0.7rem 0.9rem;
  background: rgba(245, 158, 11, 0.12);
  border: 1px solid #f59e0b;
  color: #fbbf24;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  line-height: 1.45;
}
.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 0.5rem;
  margin-top: 1.25rem;
}
.confirm-message {
  margin: 0;
  color: var(--text-dim);
  line-height: 1.5;
  font-size: 0.95rem;
}
.confirm-message strong { color: var(--text); }

.settings-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.settings-row {
  display: flex;
  align-items: center;
  gap: 1rem;
  width: 100%;
  padding: 0.85rem 1rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font: inherit;
  text-align: left;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
}
.settings-row:hover:not(:disabled) {
  border-color: var(--accent);
  background: var(--bg-card-hover);
}
.settings-row:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}
.settings-row-text { flex: 1; min-width: 0; }
.settings-row-title { font-weight: 600; font-size: 0.95rem; }
.settings-row-sub { font-size: 0.8rem; color: var(--text-dim); margin-top: 0.15rem; }
.settings-row-arrow { color: var(--text-dim); font-size: 1.4rem; line-height: 1; }

.secret-row { display: block; margin-bottom: 0.85rem; }
.secret-row > span {
  display: block;
  margin-bottom: 0.35rem;
  font-size: 0.8rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.secret-input {
  display: flex;
  align-items: stretch;
  gap: 0.5rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.5rem 0.6rem;
}
.secret-input code {
  flex: 1;
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.8rem;
  color: var(--text);
  word-break: break-all;
  user-select: all;
  align-self: center;
}
.copy-btn {
  background: var(--bg-card-hover);
  border: 1px solid var(--border);
  color: var(--text-dim);
  border-radius: 6px;
  padding: 0.3rem 0.7rem;
  font: inherit;
  font-size: 0.8rem;
  cursor: pointer;
  white-space: nowrap;
  transition: color 0.15s, background 0.15s;
}
.copy-btn:hover { color: var(--text); background: var(--border); }
.copy-btn.copied { color: var(--on); border-color: var(--on); }

@keyframes modal-in {
  from { opacity: 0; transform: translateY(-8px) scale(0.98); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}

.toast-stack {
  position: fixed;
  bottom: 1rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  z-index: 100;
  pointer-events: none;
}
.toast {
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 0.7rem 1rem;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow);
  font-size: 0.9rem;
  pointer-events: auto;
  animation: toast-in 0.2s ease-out;
}
.toast.error { border-color: var(--error); color: var(--error); }
@keyframes toast-in {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ---------- Telemetry (sensör) ---------- */
.telemetry {
  border-top: 1px solid var(--border);
  padding-top: 0.85rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}
.readings { display: flex; gap: 0.5rem; }
.reading {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.15rem;
  padding: 0.6rem 0.3rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  text-align: center;
  min-width: 0;
}
.r-icon { font-size: 1.1rem; line-height: 1; }
.r-value { font-weight: 700; font-size: 1.02rem; }
.r-label { font-size: 0.68rem; color: var(--text-dim); }

.aq-badge { font-weight: 700; }
.aq-badge[data-aq="good"] { color: var(--on); }
.aq-badge[data-aq="mid"]  { color: #fbbf24; }
.aq-badge[data-aq="bad"]  { color: var(--error); }

.telemetry-foot { display: flex; gap: 1rem; }
.telemetry-foot .link-btn { padding: 0.1rem 0; font-size: 0.82rem; }

.telemetry-graph { display: flex; flex-direction: column; gap: 0.8rem; }
.graph-loading { font-size: 0.82rem; color: var(--text-dim); text-align: center; padding: 0.5rem; }
.graph-block { display: flex; flex-direction: column; gap: 0.2rem; }
.graph-title { display: flex; justify-content: space-between; font-size: 0.75rem; color: var(--text-dim); }
.graph-cur { font-weight: 700; color: var(--text); }
.spark {
  width: 100%;
  height: 50px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
}
.graph-range { display: flex; justify-content: space-between; font-size: 0.65rem; color: var(--text-dim); }

.gas-info {
  font-size: 0.8rem;
  color: var(--text-dim);
  line-height: 1.5;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.75rem 0.9rem;
}
.gas-info p { margin: 0 0 0.5rem; }
.gas-info ul { margin: 0 0 0.5rem; padding-left: 1.1rem; }
.gas-info li { margin-bottom: 0.2rem; }
.gas-info b { color: var(--text); }
.gas-info .muted { font-style: italic; margin-bottom: 0; }

@media (max-width: 480px) {
  .dashboard { padding: 1rem 0.75rem 4rem; }
  .device-grid { grid-template-columns: 1fr; }
  .login-card { padding: 1.5rem 1.25rem; }
}