:root {
  --bg: #0f1420;
  --card-bg: #1a2233;
  --text: #e8ecf4;
  --muted: #8b96ab;
  --accent: #4f8cff;
  --danger: #ff5c5c;
  --border: #2a3450;
}

* { box-sizing: border-box; }

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

.login-body {
  display: flex;
  align-items: center;
  justify-content: center;
}

.login-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 2rem;
  width: min(90vw, 360px);
  text-align: center;
}

.login-card h1 {
  font-size: 1.2rem;
  margin-bottom: 1.5rem;
}

.login-card form {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.login-card label {
  text-align: right;
  font-size: 0.9rem;
  color: var(--muted);
}

input[type="password"] {
  padding: 0.6rem 0.8rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: #0d1320;
  color: var(--text);
  font-size: 1rem;
}

button {
  cursor: pointer;
  font-family: inherit;
}

.login-card button[type="submit"] {
  padding: 0.6rem;
  border-radius: 8px;
  border: none;
  background: var(--accent);
  color: white;
  font-size: 1rem;
  margin-top: 0.5rem;
}

.error-message {
  color: var(--danger);
  margin-top: 1rem;
  font-size: 0.9rem;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--border);
}

.topbar h1 {
  font-size: 1.1rem;
}

.link-btn {
  background: none;
  border: none;
  color: var(--muted);
  text-decoration: underline;
  font-size: 0.9rem;
}

.devices {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  padding: 1.5rem;
  max-width: 900px;
  margin: 0 auto;
}

.device-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.25rem;
}

.device-card h2 {
  margin: 0 0 0.75rem;
  font-size: 1rem;
  color: var(--muted);
}

.refresh-btn {
  padding: 0.5rem 1rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: #0d1320;
  color: var(--text);
  font-size: 0.9rem;
  margin-bottom: 1rem;
}

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

.code-area {
  min-height: 90px;
}

.no-code-msg {
  color: var(--muted);
}

.code-display {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.code-value {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  font-variant-numeric: tabular-nums;
}

.copy-btn {
  padding: 0.4rem 0.8rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--accent);
  font-size: 0.85rem;
}

.received-at, .expires-in {
  color: var(--muted);
  font-size: 0.85rem;
  margin: 0.4rem 0 0;
}

.expires-in.expiring-soon {
  color: var(--danger);
}