:root {
  --bg: #0d1117;
  --panel: #161b22;
  --fg: #c9d1d9;
  --muted: #8b949e;
  --accent: #2f81f7;
  --ok: #3fb950;
  --err: #f85149;
  --border: #30363d;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  display: flex;
  justify-content: center;
  padding: 2rem 1rem;
}

main { width: 100%; max-width: 640px; }

h1 { font-size: 1.4rem; margin: 0; }
h1 .sub { font-size: 0.8rem; color: var(--muted); font-weight: normal; }

/* App header: menu button + title. */
.apphead { display: flex; align-items: center; gap: 0.6rem; margin-bottom: 1rem; }
#menuBtn { font-size: 1.1rem; line-height: 1; padding: 0.45rem 0.65rem; }

/* Left drawer menu. */
/* `display: flex` would override the `hidden` attribute's UA display:none —
   restate it explicitly so a hidden drawer is really gone (not click-eating). */
.drawer[hidden] { display: none; }
.drawer {
  position: fixed;
  top: 0; left: 0; bottom: 0;
  width: min(75vw, 260px);
  background: var(--panel);
  border-right: 1px solid var(--border);
  padding: 1rem 0.6rem;
  z-index: 20;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}
.navitem {
  background: none;
  border: none;
  color: var(--fg);
  text-align: left;
  padding: 0.7rem 0.8rem;
  border-radius: 6px;
  font: inherit;
  cursor: pointer;
}
.navitem:hover { background: var(--bg); }
.navitem.active { background: var(--bg); color: var(--accent); outline: 1px solid var(--border); }
.scrim { position: fixed; inset: 0; background: rgba(0, 0, 0, 0.55); z-index: 10; }

/* Users view: contact list with trust marks. */
.userlist { list-style: none; margin: 0.5rem 0 0.75rem; padding: 0; }
.userlist li {
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  padding: 0.6rem 0.75rem;
  margin-bottom: 0.5rem;
}
.u-head { display: flex; align-items: center; justify-content: space-between; gap: 0.5rem; flex-wrap: wrap; }
.u-name { font-size: 0.95rem; color: var(--fg); }
.u-mark { font-size: 0.74rem; color: var(--muted); }
.u-mark.ok { color: var(--ok); }
.u-mark.mid { color: #d29922; }
.u-fp { font-size: 0.72rem; color: var(--muted); margin: 0.35rem 0; word-break: break-word; }
.u-actions { margin-top: 0.35rem; }
.u-actions button { font-size: 0.78rem; padding: 0.4rem 0.6rem; }

/* Chats view: chat list rows + WhatsApp-style conversation bubbles. */
.chatrow { cursor: pointer; }
.chatrow:hover { border-color: var(--accent); }
/* The conversation header keeps a flex row on every screen size (the mobile
   .topbar grid is meant for the live-room bar only). */
.topbar.convo-head { position: static; margin-bottom: 0.6rem; display: flex; align-items: center; flex-wrap: wrap; }
.convo-head .u-name { flex: 1 1 auto; }
.convo-head .u-mark { flex: 0 0 auto; }
#chatModeSel { margin-left: auto; }
#chatBack { flex: 0 0 auto; }
.chatmode { font-size: 0.72rem; color: var(--muted); }
#chatModeSel { width: auto; flex: 0 0 auto; padding: 0.3rem 0.4rem; font-size: 0.76rem; }
.pending {
  background: #2b2410;
  border: 1px solid #d29922;
  color: #e3b341;
  border-radius: 6px;
  padding: 0.5rem 0.6rem;
  margin-bottom: 0.6rem;
  font-size: 0.82rem;
}
.pending button { margin-left: 0.4rem; font-size: 0.76rem; padding: 0.3rem 0.55rem; }
#chatLog {
  list-style: none;
  margin: 0 0 0.75rem;
  padding: 0.5rem;
  height: min(50vh, 440px);
  overflow-y: auto;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg);
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}
#chatLog li {
  max-width: 82%;
  padding: 0.45rem 0.65rem;
  border-radius: 12px;
  white-space: pre-wrap;
  word-break: break-word;
  font-size: 0.9rem;
}
#chatLog li.me {
  align-self: flex-end;
  background: #1f4e9b;
  color: #fff;
  border-bottom-right-radius: 4px;
}
#chatLog li.peer {
  align-self: flex-start;
  background: var(--panel);
  border: 1px solid var(--border);
  border-bottom-left-radius: 4px;
}
@media (max-width: 600px) {
  #chatLog { height: calc(100dvh - 21rem); min-height: 10rem; }
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem;
  margin-bottom: 1rem;
}

.row { margin-bottom: 0.85rem; }
.row:last-child { margin-bottom: 0; }

label { display: block; font-size: 0.8rem; color: var(--muted); margin-bottom: 0.3rem; }

input, select {
  width: 100%;
  background: var(--bg);
  color: var(--fg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.55rem 0.6rem;
  font: inherit;
}

input:focus, select:focus { outline: 1px solid var(--accent); border-color: var(--accent); }

.inline { display: flex; gap: 0.5rem; align-items: center; }
.inline input { flex: 1; }

button {
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 6px;
  padding: 0.55rem 0.9rem;
  font: inherit;
  cursor: pointer;
  white-space: nowrap;
}
button:disabled { opacity: 0.45; cursor: not-allowed; }
button#gen { background: #21262d; color: var(--fg); border: 1px solid var(--border); }

.status { font-size: 0.85rem; color: var(--muted); margin-left: 0.6rem; }
.status.ok { color: var(--ok); }
.status.err { color: var(--err); }

/* Three-step flow: step indicator + per-screen navigation. */
.step { font-size: 0.78rem; color: var(--muted); margin: 0 0 0.6rem; letter-spacing: 0.03em; }
.step strong { color: var(--accent); font-weight: 600; }
.nav { display: flex; justify-content: flex-end; }
button.ghost { background: #21262d; color: var(--fg); border: 1px solid var(--border); }

/* Chat top bar: room id (copyable) + status + disconnect, always in view. */
.topbar {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 0.75rem;
  position: sticky;
  top: 0;
  z-index: 1;
}
.roomid {
  font-size: 0.8rem;
  color: var(--muted);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.35rem 0.5rem;
  white-space: nowrap;
}
.topbar .status { flex: 1; text-align: right; margin-left: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.topbar button { padding: 0.35rem 0.6rem; font-size: 0.82rem; }

/* Encryption picker: radio cards (large touch targets, description visible). */
.alg-cards { display: grid; gap: 0.45rem; }
.alg-card {
  display: block;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.6rem 0.75rem;
  cursor: pointer;
  margin-bottom: 0;
}
.alg-card input {
  /* Visually hidden but still focusable/checkable — the card is the control. */
  position: absolute;
  width: 1px; height: 1px;
  opacity: 0;
  pointer-events: none;
}
.alg-card:has(input:checked) { border-color: var(--accent); outline: 1px solid var(--accent); }
.alg-card:has(input:focus-visible) { outline: 2px solid var(--accent); }
.alg-name { display: block; font-size: 0.9rem; color: var(--fg); margin-bottom: 0.15rem; }
.alg-card:has(input:checked) .alg-name { color: var(--accent); }
.alg-desc { display: block; font-size: 0.74rem; color: var(--muted); }
.badge {
  font-style: normal;
  font-size: 0.65rem;
  color: var(--ok);
  border: 1px solid var(--ok);
  border-radius: 999px;
  padding: 0.05rem 0.45rem;
  margin-left: 0.35rem;
  vertical-align: 0.1em;
}
.badge.pq { color: var(--accent); border-color: var(--accent); }

/* Phone-sized screens: tighter chrome, bigger touch targets, chat fills the
   viewport. 16px inputs stop mobile browsers from zooming on focus. */
@media (max-width: 600px) {
  body { padding: 0.75rem 0.6rem; }
  h1 { font-size: 1.1rem; margin-bottom: 0.6rem; }
  .panel { padding: 0.75rem; }
  input, select, button { font-size: 16px; }
  button { padding: 0.65rem 0.9rem; }
  /* 2×2 grid: room id | copy  //  status | disconnect. */
  .topbar { display: grid; grid-template-columns: 1fr auto; gap: 0.4rem; }
  .topbar button { font-size: 13px; padding: 0.45rem 0.55rem; }
  .roomid { overflow: hidden; text-overflow: ellipsis; font-size: 0.72rem; align-self: center; }
  .topbar .status { text-align: left; margin: 0; align-self: center; }
  .topbar #disconnect { justify-self: end; }
  /* 100dvh minus header, top bar, send form and margins. */
  #log { height: calc(100dvh - 17rem); min-height: 10rem; }
}

#log {
  list-style: none;
  margin: 0 0 0.75rem;
  padding: 0;
  height: min(55vh, 480px);
  overflow-y: auto;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg);
}
#log li { padding: 0.35rem 0.6rem; border-bottom: 1px solid var(--border); white-space: pre-wrap; word-break: break-word; }
#log li.me  { color: var(--accent); }
#log li.peer { color: var(--fg); }
#log li.sys  { color: var(--muted); font-style: italic; }
#log li .who { font-size: 0.72rem; color: var(--muted); margin-right: 0.4rem; }

.hint { font-size: 0.78rem; color: var(--muted); margin: 0.5rem 0 0; min-height: 1em; }
.hint.err { color: var(--err); }
.hint.ok { color: var(--ok); }

button.danger { background: var(--err); }
button#idCreate, button#idUnlock { background: #21262d; color: var(--fg); border: 1px solid var(--border); }

/* Safety number: large, grouped, easy to read aloud and compare in person. */
.safety {
  font-size: 1.05rem;
  letter-spacing: 0.04em;
  line-height: 1.7;
  color: var(--fg);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.75rem;
  margin: 0.25rem 0;
  word-break: break-word;
}

/* Loud banner when a pinned contact's identity key has changed. */
#verify.changed { border-color: var(--err); }
#verify.changed #verifyTitle { color: var(--err); }

/* One-time-pad panel. */
#otpPanel { margin-bottom: 0.85rem; }
#otpTools { margin-top: 0.6rem; border: 1px solid var(--border); border-radius: 6px; padding: 0.5rem 0.7rem; background: var(--bg); }
#otpTools summary { cursor: pointer; font-size: 0.82rem; color: var(--accent); }
.otp-sub { margin-top: 0.8rem; padding-top: 0.7rem; border-top: 1px solid var(--border); }
.otp-sub:first-of-type { border-top: none; }
.otp-entropy { display: block; width: 100%; max-width: 340px; height: 90px; background: var(--panel); border: 1px dashed var(--border); border-radius: 6px; touch-action: none; cursor: crosshair; }
#otpForget { margin-left: 0.5rem; }
button#otpImport, button#otpExport { background: #21262d; color: var(--fg); border: 1px solid var(--border); }