:root {
  --bg: #f6f3ee;
  --fg: #1f1d1a;
  --muted: #6b665e;
  --card: #ffffff;
  --line: #e2ddd4;
  --accent: #3f6b4a;
  --accent-fg: #ffffff;
  --me: #dfeee3;
  --them: #efe9df;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #15171a;
    --fg: #ececec;
    --muted: #9a9a9a;
    --card: #1e2125;
    --line: #2c3036;
    --accent: #6fae7f;
    --accent-fg: #0f1a12;
    --me: #24392b;
    --them: #2b2f34;
  }
}
* { box-sizing: border-box; }
html, body { margin: 0; background: var(--bg); color: var(--fg); font: 16px/1.4 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }
.wrap { max-width: 560px; margin: 0 auto; padding: 16px; padding-bottom: max(16px, env(safe-area-inset-bottom)); }
h1 { font-size: 1.25rem; margin: 0; }
.muted { color: var(--muted); }
.screen[hidden] { display: none; }
#screen-login { padding-top: 15vh; }
#screen-login h1 { font-size: 2rem; margin-bottom: 4px; }
form label { display: block; margin: 14px 0 6px; font-weight: 600; }
input[type="text"], input[type="password"] {
  width: 100%; padding: 12px; font-size: 1rem; border: 1px solid var(--line); border-radius: 10px; background: var(--card); color: var(--fg);
}
button { font: inherit; padding: 12px 16px; border-radius: 10px; border: 1px solid var(--accent); background: var(--accent); color: var(--accent-fg); cursor: pointer; }
button:disabled { opacity: .6; cursor: default; }
button.ghost { background: transparent; color: var(--fg); border-color: var(--line); padding: 8px 12px; }
#login-btn { width: 100%; margin-top: 18px; }
.msg-line { min-height: 1.4em; color: var(--muted); margin: 10px 0 0; }
.bar { display: flex; align-items: center; justify-content: space-between; gap: 8px; margin-bottom: 10px; flex-wrap: wrap; }
.bar h1 { flex: 1 1 auto; }
.actions { display: flex; gap: 6px; }
.opp-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
.opp { width: 100%; display: flex; justify-content: space-between; align-items: center; background: var(--card); border: 1px solid var(--line); color: var(--fg); border-radius: 12px; padding: 14px; }
.opp-name { font-weight: 600; font-size: 1.05rem; }
.opp-meta { color: var(--muted); font-size: .9rem; }
.status { margin: 6px 0 8px; color: var(--muted); min-height: 1.4em; }
.board { width: 100%; max-width: 528px; margin: 0 auto; }
.chat { margin-top: 14px; background: var(--card); border: 1px solid var(--line); border-radius: 12px; overflow: hidden; }
.chat-log { height: 180px; overflow-y: auto; padding: 10px; display: flex; flex-direction: column; gap: 6px; }
.msg { max-width: 85%; padding: 8px 10px; border-radius: 10px; white-space: pre-wrap; word-break: break-word; }
.msg.me { align-self: flex-end; background: var(--me); }
.msg.them { align-self: flex-start; background: var(--them); }
.msg.sys { align-self: center; color: var(--muted); font-size: .9rem; }
.chat-form { display: flex; gap: 6px; padding: 8px; border-top: 1px solid var(--line); }
.chat-form input { flex: 1; }
button.wide { width: 100%; }
.divider { display: flex; align-items: center; gap: 10px; color: var(--muted); font-size: .9rem; margin: 18px 0 4px; }
.divider::before, .divider::after { content: ""; flex: 1; border-top: 1px solid var(--line); }
.about { margin-top: 36px; font-size: .95rem; }
.about h2 { font-size: 1rem; margin: 0 0 6px; color: var(--fg); }
.about p { margin: 0 0 10px; }