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

:root {
  --bg: #0f0f0f;
  --surface: #1a1a1a;
  --border: #2a2a2a;
  --text: #f0f0f0;
  --muted: #888;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --success: #22c55e;
  --danger: #ef4444;
  --warning: #f59e0b;
  --font: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

html { font-size: 16px; }
body { background: var(--bg); color: var(--text); font-family: var(--font); line-height: 1.5; min-height: 100vh; }
a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-hover); }
button { cursor: pointer; font-family: var(--font); }
.hidden { display: none !important; }

/* ── Nav ── */
nav { border-bottom: 1px solid var(--border); background: var(--bg); position: sticky; top: 0; z-index: 100; }
.nav-inner { max-width: 1100px; margin: 0 auto; padding: 0 1.5rem; height: 60px; display: flex; align-items: center; justify-content: space-between; }
.logo { font-size: 1.1rem; font-weight: 700; color: var(--text); }
.logo:hover { color: var(--accent); }
.nav-right { display: flex; align-items: center; gap: 1rem; }
.nav-email { font-size: 0.85rem; color: var(--muted); }

/* ── Buttons ── */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 0.4rem; padding: 0.5rem 1rem; border-radius: 6px; font-size: 0.875rem; font-weight: 500; border: none; transition: background 0.15s, opacity 0.15s; cursor: pointer; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover:not(:disabled) { background: var(--accent-hover); }
.btn-outline { background: transparent; color: var(--text); border: 1px solid var(--border); }
.btn-outline:hover:not(:disabled) { border-color: var(--muted); }
.btn-danger { background: transparent; color: var(--danger); border: 1px solid rgba(239,68,68,0.4); }
.btn-danger:hover:not(:disabled) { background: var(--danger); color: #fff; }
.btn-full { width: 100%; }
.btn-sm { padding: 0.35rem 0.75rem; font-size: 0.8rem; }

/* ── Auth layout ── */
.auth-page { display: flex; flex-direction: column; align-items: center; justify-content: center; min-height: 100vh; padding: 1.5rem; }
.auth-card { background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 2.5rem; width: 100%; max-width: 400px; }
.auth-logo { display: block; font-size: 1.1rem; font-weight: 700; color: var(--text); margin-bottom: 1.75rem; }
.auth-logo:hover { color: var(--accent); }
.auth-card h1 { font-size: 1.4rem; font-weight: 700; margin-bottom: 1.5rem; }
.auth-switch { margin-top: 1.25rem; font-size: 0.875rem; color: var(--muted); text-align: center; }

/* ── Forms ── */
.field { margin-bottom: 1rem; }
.field label { display: block; font-size: 0.85rem; color: var(--muted); margin-bottom: 0.35rem; }
.field input { width: 100%; background: var(--bg); border: 1px solid var(--border); border-radius: 6px; padding: 0.6rem 0.75rem; color: var(--text); font-size: 0.95rem; font-family: var(--font); transition: border-color 0.15s; }
.field input:focus { outline: none; border-color: var(--accent); }
.field input::placeholder { color: var(--muted); }
.submit-btn { margin-top: 0.5rem; }

/* ── Alerts ── */
.alert { padding: 0.75rem 1rem; border-radius: 6px; font-size: 0.875rem; margin-bottom: 1rem; }
.alert-error { background: rgba(239,68,68,0.1); border: 1px solid rgba(239,68,68,0.25); color: #fca5a5; }
.alert-success { background: rgba(34,197,94,0.1); border: 1px solid rgba(34,197,94,0.25); color: #86efac; }

/* ── Page layout ── */
.page { max-width: 1100px; margin: 0 auto; padding: 2rem 1.5rem; }
.page-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 2rem; flex-wrap: wrap; gap: 1rem; }
.page-header h1 { font-size: 1.5rem; font-weight: 700; }
.back-link { display: inline-flex; align-items: center; gap: 0.3rem; font-size: 0.875rem; color: var(--muted); margin-bottom: 1.5rem; }
.back-link:hover { color: var(--text); }

/* ── Badges ── */
.badge { display: inline-flex; align-items: center; gap: 0.35rem; padding: 0.2rem 0.65rem; border-radius: 99px; font-size: 0.75rem; font-weight: 600; }
.badge::before { content: ''; width: 6px; height: 6px; border-radius: 50%; background: currentColor; flex-shrink: 0; }
.badge-online { color: var(--success); background: rgba(34,197,94,0.12); }
.badge-offline { color: var(--muted); background: rgba(136,136,136,0.1); }

/* ── Device grid ── */
.device-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 1rem; }
.device-card { background: var(--surface); border: 1px solid var(--border); border-radius: 10px; padding: 1.5rem; }
.device-card-header { display: flex; align-items: flex-start; justify-content: space-between; margin-bottom: 0.5rem; gap: 1rem; }
.device-name { font-size: 1rem; font-weight: 600; margin-bottom: 0.35rem; }
.device-meta { font-size: 0.8rem; color: var(--muted); margin: 0.75rem 0 1.25rem; }
.device-actions { display: flex; gap: 0.5rem; flex-wrap: wrap; }

/* ── Empty state ── */
.empty-state { text-align: center; padding: 5rem 1rem; }
.empty-icon { font-size: 2.5rem; margin-bottom: 1rem; }
.empty-state h2 { font-size: 1.1rem; font-weight: 600; margin-bottom: 0.5rem; }
.empty-state p { color: var(--muted); font-size: 0.9rem; margin-bottom: 1.5rem; }

/* ── Modal ── */
.modal-backdrop { position: fixed; inset: 0; background: rgba(0,0,0,0.75); z-index: 200; display: flex; align-items: center; justify-content: center; padding: 1rem; }
.modal { background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 2rem; width: 100%; max-width: 460px; }
.modal h2 { font-size: 1.2rem; font-weight: 700; margin-bottom: 1.5rem; }
.modal-actions { display: flex; gap: 0.75rem; justify-content: flex-end; margin-top: 1.25rem; }

/* ── Token display ── */
.token-box { background: var(--bg); border: 1px solid var(--border); border-radius: 6px; padding: 0.85rem 1rem; font-family: 'Courier New', monospace; font-size: 0.8rem; word-break: break-all; color: var(--success); margin: 0.75rem 0 1rem; line-height: 1.6; }
.token-warning { font-size: 0.8rem; color: var(--warning); padding: 0.6rem 0.75rem; background: rgba(245,158,11,0.08); border: 1px solid rgba(245,158,11,0.2); border-radius: 6px; margin-bottom: 0.75rem; }

/* ── Device page ── */
.device-page-header { margin-bottom: 2rem; }
.device-page-header h1 { font-size: 1.5rem; font-weight: 700; margin-bottom: 0.4rem; }
.device-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem; }
.section-card { background: var(--surface); border: 1px solid var(--border); border-radius: 10px; padding: 1.5rem; }
.section-title { font-size: 0.75rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.07em; color: var(--muted); margin-bottom: 1.25rem; display: flex; align-items: center; gap: 0.5rem; }
.refresh-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--accent); animation: pulse 2s infinite; }
@keyframes pulse { 0%,100% { opacity: 1; } 50% { opacity: 0.3; } }

/* ── Command buttons ── */
.command-grid { display: flex; flex-direction: column; gap: 0.75rem; margin-bottom: 1.25rem; }
.cmd-btn { width: 100%; padding: 0.85rem 1rem; border-radius: 8px; font-size: 0.95rem; font-weight: 600; border: 1px solid; cursor: pointer; transition: background 0.15s; font-family: var(--font); text-align: left; }
.cmd-btn:disabled { opacity: 0.4; cursor: not-allowed; }
.cmd-on  { background: rgba(34,197,94,0.1);  color: var(--success); border-color: rgba(34,197,94,0.25);  }
.cmd-off { background: rgba(239,68,68,0.1);  color: var(--danger);  border-color: rgba(239,68,68,0.25);  }
.cmd-reset { background: rgba(245,158,11,0.1); color: var(--warning); border-color: rgba(245,158,11,0.25); }
.cmd-on:hover:not(:disabled)    { background: rgba(34,197,94,0.2);  }
.cmd-off:hover:not(:disabled)   { background: rgba(239,68,68,0.2);  }
.cmd-reset:hover:not(:disabled) { background: rgba(245,158,11,0.2); }
.cmd-result { padding: 0.65rem 0.85rem; border-radius: 6px; font-size: 0.85rem; }
.cmd-ok   { background: rgba(34,197,94,0.1);  color: #86efac; }
.cmd-warn { background: rgba(245,158,11,0.1); color: #fde68a; }
.cmd-err  { background: rgba(239,68,68,0.1);  color: #fca5a5; }

/* ── Telemetry ── */
.telemetry-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0.75rem; margin-bottom: 1rem; }
.tel-card { background: var(--bg); border: 1px solid var(--border); border-radius: 8px; padding: 1rem; }
.tel-label { font-size: 0.72rem; color: var(--muted); text-transform: uppercase; letter-spacing: 0.06em; margin-bottom: 0.4rem; }
.tel-value { font-size: 1.3rem; font-weight: 700; }
.tel-value.on  { color: var(--success); }
.tel-value.off { color: var(--muted); }
.tel-updated { font-size: 0.75rem; color: var(--muted); }

/* ── History table ── */
.history-table { width: 100%; border-collapse: collapse; font-size: 0.85rem; margin-top: 1.5rem; }
.history-table th { text-align: left; color: var(--muted); font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.06em; padding-bottom: 0.6rem; font-weight: 600; border-bottom: 1px solid var(--border); }
.history-table td { padding: 0.6rem 0; border-bottom: 1px solid var(--border); color: var(--muted); vertical-align: middle; }
.history-table td:first-child { color: var(--text); font-weight: 500; text-transform: capitalize; }
.status-pending   { color: var(--warning); }
.status-delivered { color: var(--success); }

/* ── Spinner ── */
.spinner { width: 1.5rem; height: 1.5rem; border: 2px solid var(--border); border-top-color: var(--accent); border-radius: 50%; animation: spin 0.6s linear infinite; margin: 3rem auto; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ── Responsive ── */
@media (max-width: 700px) {
  .device-layout { grid-template-columns: 1fr; }
}
@media (max-width: 600px) {
  .page { padding: 1.5rem 1rem; }
  .auth-card { padding: 1.75rem 1.5rem; }
  .nav-email { display: none; }
}