:root { --fg:#222; --muted:#666; --border:#eaeaea; --bg:#fff; --bg2:#f7f8fa; }
*{box-sizing:border-box}html,body{margin:0;padding:0}
body{font-family:system-ui,-apple-system,"Microsoft YaHei","PingFang SC",Arial,sans-serif;color:var(--fg);background:var(--bg2);line-height:1.6}
.container{max-width:980px;margin:24px auto;padding:0 16px}
.header{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px}
.header h1{margin:0;font-size:24px}
a.btn,button.btn{display:inline-block;padding:8px 12px;border:1px solid var(--border);background:var(--bg);border-radius:8px;text-decoration:none;color:var(--fg);cursor:pointer}
.card{background:var(--bg);border:1px solid var(--border);border-radius:12px;padding:14px 16px;margin:12px 0;box-shadow:0 1px 2px rgba(0,0,0,.03)}
.meta{color:var(--muted);font-size:12px;margin-bottom:8px}
.thread-title{margin:0 0 6px}
.form-row{margin:10px 0}
input[type=text],input[type=password]{width:100%;padding:8px 10px;border:1px solid var(--border);border-radius:8px}
textarea{width:100%;min-height:240px}
.actions{display:flex;gap:8px;flex-wrap:wrap}
.alert{background:#fff3cd;border:1px solid #ffe69c;padding:10px 12px;border-radius:8px;margin:12px 0}
.success{background:#eaffe5;border-color:#b8f1b0}
.warn{background:#ffeaea;border-color:#ffb3b3}
footer{margin:24px 0;color:var(--muted);font-size:12px;text-align:center}