:root {
  --primary: #2f6f5e;
  --bg: #f4f5f2;
  --card: #fff;
  --text: #1f2421;
  --muted: #7a817c;
  --border: #e3e5e0;
  --user: #2f6f5e;
  --danger: #c0392b;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 16px;
}

.hidden { display: none !important; }
.muted { color: var(--muted); font-size: 14px; }
.error { color: var(--danger); font-size: 14px; min-height: 1em; }
.spacer { flex: 1; }

button {
  font: inherit;
  border: none;
  border-radius: 8px;
  padding: 8px 16px;
  background: var(--primary);
  color: #fff;
  cursor: pointer;
}
button:disabled { opacity: .5; }
button.link { background: none; color: var(--primary); padding: 4px 8px; }
button.small { padding: 4px 10px; font-size: 14px; }
button.ghost { background: none; color: var(--muted); border: 1px solid var(--border); }

input, textarea, select {
  font: inherit;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 12px;
  background: #fff;
  width: 100%;
}

.view { height: 100%; }

#login-view { display: flex; align-items: center; justify-content: center; padding: 16px; }
.card { background: var(--card); border-radius: 12px; padding: 24px; box-shadow: 0 2px 12px rgba(0,0,0,.06); }
.login-card { width: 100%; max-width: 360px; display: flex; flex-direction: column; gap: 12px; }
.login-card h1 { margin: 0; color: var(--primary); }

#app-view { display: flex; flex-direction: column; max-width: 760px; margin: 0 auto; background: var(--bg); }

.topbar {
  display: flex; align-items: center; gap: 8px;
  padding: 10px 16px; padding-top: max(10px, env(safe-area-inset-top));
  background: var(--card); border-bottom: 1px solid var(--border);
}
.topbar strong { color: var(--primary); font-size: 18px; }

.banner {
  display: flex; align-items: center; gap: 8px;
  margin: 8px 12px 0; padding: 12px; border-radius: 10px;
  background: #fff4d6; border: 1px solid #f0d58a;
}
.banner span { flex: 1; }

main { flex: 1; min-height: 0; display: flex; flex-direction: column; }
.tab { flex: 1; min-height: 0; display: flex; flex-direction: column; }
.toolbar { display: flex; justify-content: flex-end; padding: 6px 12px; }
.toolbar select { width: auto; }
.hint { padding: 8px 16px 0; margin: 0; }

.messages { flex: 1; overflow-y: auto; padding: 8px 12px 16px; display: flex; flex-direction: column; gap: 10px; }
.msg { max-width: 85%; padding: 10px 14px; border-radius: 14px; line-height: 1.55; white-space: pre-wrap; word-break: break-word; }
.msg.user { align-self: flex-end; background: var(--user); color: #fff; border-bottom-right-radius: 4px; }
.msg.assistant { align-self: flex-start; background: var(--card); border-bottom-left-radius: 4px; }
.msg.status { align-self: flex-start; background: none; color: var(--muted); font-size: 13px; padding: 0 4px; }
.msg.error { align-self: center; background: none; color: var(--danger); font-size: 14px; }
.empty { text-align: center; color: var(--muted); margin-top: 40px; }

.composer {
  display: flex; gap: 8px; padding: 8px 12px;
  background: var(--card); border-top: 1px solid var(--border);
}
.composer textarea { resize: none; max-height: 140px; }

.list { list-style: none; margin: 0; padding: 8px 12px; overflow-y: auto; flex: 1; }
.list li {
  background: var(--card); border-radius: 10px; padding: 12px 14px; margin-bottom: 8px;
  display: flex; gap: 10px; align-items: center;
}
.list .body { flex: 1; min-width: 0; }
.list .title { word-break: break-word; }
.list .meta { color: var(--muted); font-size: 13px; margin-top: 2px; }
.tag { display: inline-block; font-size: 12px; padding: 1px 6px; border-radius: 4px; background: #e8f0ed; color: var(--primary); margin-right: 4px; }
.tag.warn { background: #fff4d6; color: #a06b00; }

.tabbar {
  display: flex; background: var(--card); border-top: 1px solid var(--border);
  padding-bottom: env(safe-area-inset-bottom);
}
.tabbar a { flex: 1; text-align: center; padding: 12px 0; color: var(--muted); text-decoration: none; }
.tabbar a.active { color: var(--primary); font-weight: 600; }