:root {
  --bg: #f6f6f4;
  --fg: #1d1d1b;
  --muted: #6b6b66;
  --card: #ffffff;
  --border: #d9d9d4;
  --accent: #2f6f4f;
  --accent-fg: #ffffff;
  --danger: #b3261e;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #161615;
    --fg: #ececea;
    --muted: #9a9a94;
    --card: #222220;
    --border: #3a3a37;
    --accent: #5fae86;
    --accent-fg: #0f1f17;
    --danger: #f2756a;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-size: 17px;
  line-height: 1.4;
  padding: env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left);
}

body.center {
  min-height: 100vh;
  display: grid;
  place-items: center;
}

.card {
  width: min(360px, calc(100vw - 32px));
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
}

h1 { font-size: 1.5rem; margin: 0 0 16px; }

label { display: block; font-weight: 600; margin-bottom: 6px; }

input[type="password"] {
  width: 100%;
  font-size: 17px; /* >=16px prevents iOS zoom on focus */
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  color: var(--fg);
}

button {
  font: inherit;
  cursor: pointer;
}

form button[type="submit"] {
  width: 100%;
  margin-top: 16px;
  padding: 10px 12px;
  border: 0;
  border-radius: 8px;
  background: var(--accent);
  color: var(--accent-fg);
  font-weight: 600;
}

button:disabled { opacity: 0.6; }

button.link {
  background: none;
  border: 0;
  color: var(--accent);
  padding: 4px 0;
}

.error { color: var(--danger); margin: 10px 0 0; }
.muted { color: var(--muted); }

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
}

#app { padding: 16px; }

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}