:root {
  color-scheme: dark;
  --bg: #0f172a;
  --surface: #1e293b;
  --surface-alt: #334155;
  --border: rgba(148, 163, 184, 0.15);
  --text: #f1f5f9;
  --muted: #94a3b8;
  --accent: #38bdf8;
  --success: #4ade80;
  --danger: #f87171;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

[hidden] { display: none !important; }

a { color: var(--accent); }

/* --- Login --- */

#login-view {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.login-card {
  width: 100%;
  max-width: 360px;
}

.login-card h1 {
  font-size: 1.6rem;
  margin-bottom: 0.25rem;
}

.login-card p.subtitle {
  color: var(--muted);
  margin-top: 0;
  margin-bottom: 1.75rem;
  font-size: 0.9rem;
}

input {
  width: 100%;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 14px;
  color: var(--text);
  font-size: 0.95rem;
  margin-bottom: 12px;
}

input:focus {
  outline: none;
  border-color: var(--accent);
}

button {
  font: inherit;
  cursor: pointer;
  border: none;
  border-radius: 10px;
}

button:disabled {
  opacity: 0.6;
  cursor: default;
}

.btn-primary {
  width: 100%;
  background: var(--accent);
  color: #0f172a;
  font-weight: 700;
  padding: 12px;
  margin-top: 6px;
}

.error-text {
  color: var(--danger);
  font-size: 0.85rem;
  margin: -4px 0 10px;
}

/* --- App shell --- */

#app-view {
  min-height: 100vh;
}

header.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
  gap: 12px;
}

header.topbar h1 {
  font-size: 1.35rem;
  margin: 0;
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}

.icon-btn {
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 8px 14px;
  border-radius: 8px;
  font-size: 0.85rem;
}

.icon-btn:hover { border-color: var(--accent); }

#logout-btn {
  background: transparent;
  color: var(--danger);
  font-weight: 600;
  padding: 8px 4px;
}

main {
  max-width: 1000px;
  margin: 0 auto;
  padding: 24px;
}

#empty-state {
  color: var(--muted);
  text-align: center;
  margin-top: 64px;
  line-height: 1.6;
}

.locks-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px;
}

.lock-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.lock-card h3 {
  margin: 0;
  font-size: 1.05rem;
}

.lock-meta {
  color: var(--muted);
  font-size: 0.85rem;
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.state-badge {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
}

.state-unlocked { background: rgba(74, 222, 128, 0.15); color: var(--success); }
.state-locked { background: rgba(56, 189, 248, 0.15); color: var(--accent); }
.state-unknown { background: rgba(148, 163, 184, 0.15); color: var(--muted); }

.lock-actions {
  margin-top: auto;
  display: flex;
  gap: 8px;
}

.toggle-btn {
  flex: 1;
  padding: 10px;
  font-weight: 700;
  font-size: 0.9rem;
}

.toggle-btn.state-locked-btn { background: var(--accent); color: #0f172a; }
.toggle-btn.state-unlocked-btn { background: var(--surface-alt); color: var(--text); }

.spinner {
  width: 16px;
  height: 16px;
  border: 2px solid rgba(15, 23, 42, 0.35);
  border-top-color: #0f172a;
  border-radius: 50%;
  display: inline-block;
  animation: spin 0.7s linear infinite;
}

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

#toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--surface-alt);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 12px 18px;
  border-radius: 10px;
  font-size: 0.85rem;
  max-width: 90vw;
  text-align: center;
}