:root {
  --bg: #0a0f16;
  --panel: #121a24;
  --panel-raised: #1a2532;
  --line: #253244;

  --signal: #22d3ee;
  --mesh: #4ade80;
  --danger: #f87171;
  --warn: #fbbf24;

  --text: #e6f1f5;
  --text-muted: #7a8fa3;

  --font-body: ui-sans-serif, system-ui, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, "Cascadia Code", "Roboto Mono", "SF Mono", Menlo, Consolas, monospace;
  --radius: 8px;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }

.lang-toggle {
  position: fixed;
  top: 14px;
  right: 14px;
  z-index: 10;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 5px 12px;
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 12px;
}
.lang-toggle:hover { border-color: var(--signal); color: var(--signal); }

html, body {
  height: 100%;
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
}
button { font-family: inherit; cursor: pointer; }
code { font-family: var(--font-mono); }

/* ---------------------------------------------------------------------
   Identity screen
------------------------------------------------------------------------ */
.screen {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background: radial-gradient(circle at 50% 30%, rgba(34, 211, 238, 0.06), transparent 60%), var(--bg);
}
.card { width: 100%; max-width: 440px; }
.logo {
  width: 100%;
  max-width: 260px;
  height: auto;
  margin: 0 auto 22px;
  display: block;
  filter: drop-shadow(0 6px 18px rgba(0, 0, 0, 0.55));
}
.eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--signal);
  margin: 0 0 8px;
}
.card h1 { font-size: 26px; margin: 0 0 12px; }
.card .sub { color: var(--text-muted); font-size: 13px; line-height: 1.6; margin: 0 0 28px; }

.primary-btn {
  width: 100%;
  background: var(--signal);
  border: none;
  border-radius: var(--radius);
  padding: 12px 14px;
  color: #052024;
  font-weight: 600;
  font-size: 14px;
}
.primary-btn:hover { filter: brightness(1.08); }

.or { text-align: center; color: var(--text-muted); font-size: 12px; margin: 14px 0; }

#import-form { display: flex; gap: 8px; }
#import-form input,
.card input[type="password"],
.card input[type="text"] {
  flex: 1;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 11px 12px;
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 13px;
}
.card input:focus { outline: none; border-color: var(--signal); }

.ghost-btn {
  background: transparent;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 10px 14px;
  color: var(--text);
  font-size: 13px;
  white-space: nowrap;
}
.ghost-btn:hover { border-color: var(--mesh); color: var(--mesh); }

.error-text { color: var(--danger); font-size: 12px; margin-top: 12px; }

#identity-backup .warn {
  color: var(--warn);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  margin-bottom: 16px;
}
#identity-backup label {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-muted);
  margin: 16px 0 6px;
}
#identity-backup label .muted { text-transform: none; letter-spacing: 0; }
.key-row {
  display: flex;
  gap: 8px;
  align-items: center;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 10px 12px;
}
.key-row code {
  flex: 1;
  font-size: 12px;
  color: var(--text);
  word-break: break-all;
}
.copy-btn {
  flex: none;
  background: var(--panel-raised);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 5px 10px;
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 11px;
}
.copy-btn:hover { border-color: var(--signal); color: var(--signal); }
#backup-confirm-btn { margin-top: 24px; }

/* ---------------------------------------------------------------------
   Main app
------------------------------------------------------------------------ */
.app { display: grid; grid-template-columns: 280px 1fr; height: 100vh; }

.sidebar {
  background: var(--panel);
  border-right: 1px solid var(--line);
  padding: 18px 16px;
  display: flex;
  flex-direction: column;
  min-height: 0;
  overflow-y: auto;
}

.me-row { display: flex; align-items: center; gap: 8px; margin-bottom: 14px; }
.me-label {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-muted);
  text-transform: uppercase;
  flex: none;
}
.me-npub {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 11px;
  color: var(--signal);
}

.relay-status {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-muted);
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}
.status-dot { width: 7px; height: 7px; border-radius: 50%; flex: none; }
.status-dot--joining { background: var(--signal); animation: pulse 1.2s ease-in-out infinite; }
.status-dot--live { background: var(--mesh); }
.status-dot--down { background: var(--danger); }
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.35; } }

.contacts-head {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin: 16px 0 8px;
}
#add-contact-form { display: flex; flex-direction: column; gap: 6px; margin-bottom: 10px; }
#add-contact-form input {
  background: var(--panel-raised);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 7px 9px;
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 11.5px;
}
#add-contact-form input:focus { outline: none; border-color: var(--signal); }
#add-contact-form button { font-size: 11.5px; padding: 7px; }

.contact-list { list-style: none; margin: 0; padding: 0; flex: 1; min-height: 0; overflow-y: auto; }
.contact-list li {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 6px;
  border-radius: 6px;
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 12.5px;
}
.contact-list li:hover { background: var(--panel-raised); }
.contact-list li.active { background: rgba(34, 211, 238, 0.1); color: var(--signal); }
.contact-list li .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--mesh); flex: none; }
.contact-list .empty { color: var(--text-muted); padding: 10px 6px; font-size: 12px; }

.sign-out-btn { margin-top: 14px; }
.sign-out-btn:hover { border-color: var(--danger); color: var(--danger); }

.chat { display: flex; flex-direction: column; min-width: 0; }
.chat-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding: 16px 22px;
  border-bottom: 1px solid var(--line);
}
.chat-title { font-family: var(--font-mono); font-size: 14px; font-weight: 600; }
.chat-subtitle { font-size: 11px; color: var(--text-muted); font-family: var(--font-mono); }

.messages { flex: 1; overflow-y: auto; padding: 18px 22px; display: flex; flex-direction: column; gap: 10px; }
.msg { max-width: 68%; display: flex; flex-direction: column; gap: 2px; }
.msg.mine { align-self: flex-end; align-items: flex-end; }
.msg .meta { font-family: var(--font-mono); font-size: 10.5px; color: var(--text-muted); }
.msg .bubble {
  background: var(--panel-raised);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 9px 12px;
  font-size: 14px;
  line-height: 1.45;
  word-break: break-word;
}
.msg.mine .bubble { background: rgba(34, 211, 238, 0.14); border-color: rgba(34, 211, 238, 0.35); }
.messages .empty-state { margin: auto; color: var(--text-muted); font-size: 13px; text-align: center; }

.message-form { display: flex; gap: 10px; padding: 14px 18px; border-top: 1px solid var(--line); }
.message-form input {
  flex: 1;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 11px 14px;
  color: var(--text);
  font-size: 14px;
}
.message-form input:focus { outline: none; border-color: var(--signal); }
.message-form input:disabled { opacity: 0.5; }
.message-form button {
  background: var(--mesh);
  border: none;
  border-radius: var(--radius);
  padding: 0 20px;
  color: #052014;
  font-weight: 600;
  font-size: 14px;
}
.message-form button:disabled { opacity: 0.5; cursor: not-allowed; }

@media (max-width: 720px) {
  .app { grid-template-columns: 1fr; grid-template-rows: auto 1fr; }
  .sidebar { max-height: 45vh; }
}