:root {
  color-scheme: dark;
  --bg: #0f0f11;
  --panel: #18181b;
  --line: #2a2a30;
  --text: #ededef;
  --muted: #8a8a93;
  --green: #19c37d;
  --amber: #f2b84b;
  --red: #ff6b6b;
  --radius: 10px;
  font: 15px/1.4 ui-sans-serif, -apple-system, BlinkMacSystemFont, 'Inter', 'Segoe UI', sans-serif;
}
* { box-sizing: border-box; }
html, body { margin: 0; background: var(--bg); color: var(--text); }
[hidden] { display: none !important; }

input, button { font: inherit; color: inherit; }
input {
  width: 100%;
  height: 44px;
  padding: 0 14px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  outline: none;
  transition: border-color .15s;
}
input:focus { border-color: #4a4a52; }
input::placeholder { color: var(--muted); }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 44px;
  padding: 0 20px;
  border: 0;
  border-radius: var(--radius);
  background: var(--text);
  color: var(--bg);
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: opacity .15s, transform .05s;
}
.btn:hover { opacity: .9; }
.btn:active { transform: translateY(1px); }
.btn:disabled { opacity: .5; cursor: default; }

/* Landing */
.center {
  min-height: 100dvh;
  display: grid;
  place-items: center;
  padding: 24px 16px;
}
.stack { width: 100%; max-width: 320px; display: flex; flex-direction: column; align-items: center; gap: 12px; }
.logo { width: 88px; height: 88px; margin-bottom: 4px; }
.wordmark { margin: 0 0 20px; font-size: 22px; font-weight: 600; letter-spacing: -.01em; }
.stack form { width: 100%; display: flex; flex-direction: column; gap: 10px; }
.stack form .btn { width: 100%; margin-top: 4px; }
#code { text-transform: uppercase; letter-spacing: .08em; }
#code::placeholder { text-transform: none; letter-spacing: 0; }
.err { min-height: 20px; margin: 2px 0 0; color: var(--red); font-size: 13px; text-align: center; }
.download { width: 100%; height: 52px; font-size: 16px; }
.invite-row { display: flex; align-items: center; gap: 8px; margin-top: 4px; color: var(--muted); font-size: 13px; }
.invite {
  padding: 6px 12px;
  background: none;
  border: 1px dashed var(--line);
  border-radius: 999px;
  color: var(--muted);
  font: 13px/1 ui-monospace, 'SF Mono', Menlo, monospace;
  letter-spacing: .08em;
  cursor: pointer;
  transition: color .15s, border-color .15s;
}
.invite:hover { color: var(--text); border-color: #4a4a52; }
.invite.copied { color: var(--green); border-color: var(--green); }