:root {
  --bg: #0f1720; --panel: #1a2735; --ink: #e8eef4; --muted: #8aa0b4;
  --accent: #2f6db0; --warn: #c9622f; --line: #243648;
}
* { box-sizing: border-box; }
body {
  margin: 0; font-family: -apple-system, system-ui, Segoe UI, Roboto, sans-serif;
  background: var(--bg); color: var(--ink);
  padding: env(safe-area-inset-top) 0 env(safe-area-inset-bottom);
}
header {
  display: flex; align-items: baseline; gap: .6rem;
  padding: 1rem 1rem .4rem;
}
header h1 { margin: 0; font-size: 1.4rem; }
.muted { color: var(--muted); font-size: .85rem; }
.shield {
  margin: .3rem 1rem; padding: .5rem .7rem; font-size: .78rem;
  background: #11202f; border: 1px solid var(--line); border-radius: 8px;
  color: var(--muted);
}
nav { display: flex; gap: .4rem; padding: .4rem 1rem; }
nav button {
  flex: 1; padding: .55rem; border: 1px solid var(--line);
  background: var(--panel); color: var(--muted); border-radius: 8px;
  font-size: .85rem; cursor: pointer;
}
nav button.active { color: #fff; border-color: var(--accent); background: #1d324a; }
main { padding: .4rem 1rem 2rem; }
h2 { font-size: 1rem; margin: 1rem 0 .5rem; }
h2.warn { color: var(--warn); }
.card {
  background: var(--panel); border: 1px solid var(--line); border-radius: 10px;
  padding: .7rem .8rem; margin-bottom: .5rem;
}
.card .title { font-weight: 600; }
.card .meta { color: var(--muted); font-size: .8rem; margin-top: .15rem; }
.card .note { color: var(--muted); font-size: .8rem; margin-top: .3rem; font-style: italic; }
.card.sug { border-left: 3px solid var(--accent); }
.card .why { font-size: .8rem; color: var(--muted); margin-top: .35rem; }
.card .do { font-size: .85rem; margin-top: .25rem; }
footer { padding: 1rem; text-align: center; }
code { background: #11202f; padding: .1rem .3rem; border-radius: 4px; }

/* ---- lock screen (encrypted snapshot) ---- */
#lock {
  position: fixed; inset: 0; z-index: 10;
  background: var(--bg);
  display: flex; align-items: center; justify-content: center;
  padding: 1rem;
}
#lock[hidden] { display: none; }
.lock-card {
  width: 100%; max-width: 22rem;
  background: var(--panel); border: 1px solid var(--line);
  border-radius: 12px; padding: 1.2rem;
}
.lock-card h2 { margin: 0 0 .4rem; font-size: 1.1rem; }
.lock-card input[type="password"] {
  width: 100%; padding: .6rem .7rem; margin: .6rem 0 .4rem;
  background: var(--bg); border: 1px solid var(--line); border-radius: 8px;
  color: var(--ink); font-size: 1rem;
}
.lock-card button {
  width: 100%; padding: .6rem; margin-top: .4rem;
  border: 1px solid var(--accent); background: #1d324a; color: #fff;
  border-radius: 8px; font-size: .95rem; cursor: pointer;
}
#lock-face { background: var(--panel); }
.lock-face-opt {
  display: flex; gap: .45rem; align-items: center;
  font-size: .85rem; color: var(--muted); margin: .2rem 0;
}
.lock-face-opt input { width: auto; margin: 0; }
#lock-msg { min-height: 1.2em; margin: .6rem 0 0; }