:root {
  --bg: #0f172a;
  --card: #1e293b;
  --text: #e2e8f0;
  --muted: #94a3b8;
  --accent: #38bdf8;
  --stale: #f87171;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 24px;
  border-bottom: 1px solid #334155;
}

header h1 { font-size: 1.2rem; margin: 0; }

.header-right { display: flex; align-items: center; gap: 16px; font-size: 0.85rem; color: var(--muted); }
.header-right a { color: var(--accent); text-decoration: none; }

main { padding: 24px; display: grid; gap: 20px; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); }

.device-card {
  background: var(--card);
  border-radius: 12px;
  padding: 16px 18px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.4);
}

.device-card h3 { margin: 0 0 10px 0; font-size: 1rem; color: var(--accent); }

.param-row {
  display: flex;
  justify-content: space-between;
  padding: 6px 0;
  border-bottom: 1px solid #334155;
  cursor: pointer;
}
.param-row:last-child { border-bottom: none; }
.param-row:hover { background: rgba(255,255,255,0.03); }

.param-label { color: var(--muted); font-size: 0.85rem; }
.param-value { font-weight: 600; }
.param-value.stale { color: var(--stale); }
.param-age { font-size: 0.7rem; color: var(--muted); margin-left: 6px; }

/* Login page */
.login-body { display: flex; align-items: center; justify-content: center; height: 100vh; }
.login-card {
  background: var(--card);
  padding: 32px 28px;
  border-radius: 12px;
  width: 280px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.login-card h1 { font-size: 1.1rem; margin: 0 0 8px 0; }
.login-card label { display: flex; flex-direction: column; gap: 4px; font-size: 0.85rem; color: var(--muted); }
.login-card input {
  background: #0f172a;
  border: 1px solid #334155;
  border-radius: 6px;
  padding: 8px 10px;
  color: var(--text);
  font-size: 0.95rem;
}
.login-card button {
  background: var(--accent);
  border: none;
  border-radius: 6px;
  padding: 10px;
  font-weight: 600;
  cursor: pointer;
  color: #0f172a;
}
.login-card .error { color: var(--stale); font-size: 0.85rem; margin: 0; }

/* History modal */
.modal { position: fixed; inset: 0; background: rgba(0,0,0,0.6); display: flex; align-items: center; justify-content: center; }
.modal.hidden { display: none; }
.modal-content { background: var(--card); padding: 20px; border-radius: 12px; width: min(640px, 90vw); position: relative; }
.modal-content h2 { margin-top: 0; font-size: 1rem; }
#close-modal { position: absolute; top: 10px; right: 14px; background: none; border: none; color: var(--muted); font-size: 1.4rem; cursor: pointer; }