:root {
  --bg: #0f1115;
  --panel: #181b22;
  --panel2: #1f232c;
  --text: #e8eaed;
  --muted: #9aa0a6;
  --accent: #4f8cff;
  --accent2: #34d399;
  --border: #2a2f3a;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, "PingFang SC", "Microsoft YaHei", Segoe UI, Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}
.topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 24px; background: var(--panel); border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 10;
}
.brand { font-weight: 700; font-size: 18px; color: var(--text); text-decoration: none; }
nav a { color: var(--muted); text-decoration: none; margin-left: 18px; }
nav a:hover { color: var(--text); }
main { max-width: 960px; margin: 0 auto; padding: 32px 20px 64px; }
.hero { text-align: center; margin-bottom: 36px; }
.hero h1 { font-size: 30px; margin: 0 0 10px; }
.lead { color: var(--muted); font-size: 16px; max-width: 640px; margin: 0 auto; }
.hint { color: var(--accent2); font-size: 13px; margin-top: 10px; }
h2 { font-size: 20px; border-left: 3px solid var(--accent); padding-left: 10px; margin: 32px 0 16px; }
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 16px; }
.card { background: var(--panel); border: 1px solid var(--border); border-radius: 12px; padding: 18px; transition: transform .15s, border-color .15s; }
.card:hover { transform: translateY(-2px); border-color: var(--accent); }
.card-head { display: flex; align-items: center; gap: 10px; }
.card-head h3 { margin: 0; font-size: 17px; }
.badge { font-size: 11px; padding: 2px 8px; border-radius: 20px; background: var(--panel2); color: var(--accent); border: 1px solid var(--border); }
.desc { color: var(--muted); font-size: 14px; min-height: 40px; }
.meta { color: #6b7280; font-size: 12px; }
.card-actions { margin-top: 12px; display: flex; gap: 10px; }
.btn { display: inline-block; background: var(--accent); color: #fff; text-decoration: none; padding: 8px 16px; border-radius: 8px; font-size: 14px; border: none; cursor: pointer; }
.btn:hover { opacity: .9; }
.btn.ghost { background: transparent; border: 1px solid var(--border); color: var(--text); }
.btn.big { font-size: 16px; padding: 12px 28px; }
.cta { text-align: center; margin-top: 40px; }
.empty { color: var(--muted); }
.foot { text-align: center; color: #5b6068; font-size: 13px; padding: 24px; border-top: 1px solid var(--border); }
.form-wrap, .list-wrap { background: var(--panel); border: 1px solid var(--border); border-radius: 12px; padding: 20px; margin-bottom: 24px; }
form label { display: block; margin-bottom: 14px; color: var(--muted); font-size: 14px; }
form input, form select, form textarea {
  width: 100%; margin-top: 6px; padding: 10px; border-radius: 8px;
  background: var(--panel2); border: 1px solid var(--border); color: var(--text); font-size: 14px;
}
form textarea { resize: vertical; }
.status { margin-left: 12px; font-size: 13px; color: var(--accent2); }
.msg-list { display: flex; flex-direction: column; gap: 12px; }
.msg-item { background: var(--panel2); border: 1px solid var(--border); border-radius: 10px; padding: 12px 14px; }
.msg-top { display: flex; justify-content: space-between; font-size: 12px; color: var(--muted); margin-bottom: 6px; }
.msg-type { font-size: 11px; padding: 1px 8px; border-radius: 20px; }
.msg-type.suggestion { background: rgba(79,140,255,.15); color: var(--accent); }
.msg-type.tool-request { background: rgba(52,211,153,.15); color: var(--accent2); }
.msg-content { font-size: 14px; }