* { box-sizing: border-box; margin: 0; padding: 0; }
:root {
  --bg: #f4f6fa; --card: #fff; --line: #e7eaf0; --txt: #1f2733;
  --sub: #7a8699; --brand: #2f6bff; --brand-d: #1f54d8; --ok: #12a150; --danger: #e5484d;
}
body { font-family: -apple-system, "PingFang SC", "Microsoft YaHei", Segoe UI, Roboto, sans-serif;
  background: var(--bg); color: var(--txt); font-size: 15px; line-height: 1.6; }
a { color: var(--brand); text-decoration: none; }
.wrap { max-width: 860px; margin: 0 auto; padding: 20px 16px 60px; }

/* 顶栏 */
.topbar { background: var(--card); border-bottom: 1px solid var(--line); }
.topbar .in { max-width: 860px; margin: 0 auto; padding: 12px 16px; display: flex; align-items: center; justify-content: space-between; }
.logo { font-weight: 700; font-size: 17px; }
.logo span { color: var(--brand); }
.topbar .nav a { margin-left: 16px; color: var(--sub); font-size: 14px; }
.topbar .nav a:hover { color: var(--brand); }

/* 登录卡 */
.login-wrap { min-height: 70vh; display: flex; align-items: center; justify-content: center; padding: 30px 16px; }
.login-card { width: 100%; max-width: 380px; background: var(--card); border: 1px solid var(--line);
  border-radius: 14px; padding: 32px 28px; box-shadow: 0 8px 30px rgba(31,39,51,.06); }
.login-card h1 { font-size: 20px; margin-bottom: 6px; }
.login-card p.tip { color: var(--sub); font-size: 13px; margin-bottom: 22px; }
.field { margin-bottom: 16px; }
.field label { display: block; font-size: 13px; color: var(--sub); margin-bottom: 6px; }
.field input, .field select { width: 100%; padding: 11px 12px; border: 1px solid var(--line); border-radius: 9px;
  font-size: 15px; outline: none; background: #fbfcfe; }
.field input:focus { border-color: var(--brand); background: #fff; }
.btn { display: inline-block; border: none; background: var(--brand); color: #fff; padding: 11px 18px;
  border-radius: 9px; font-size: 15px; cursor: pointer; width: 100%; font-weight: 600; }
.btn:hover { background: var(--brand-d); }
.btn.sm { width: auto; padding: 6px 12px; font-size: 13px; font-weight: 500; }
.btn.gray { background: #eef1f6; color: var(--txt); }
.btn.gray:hover { background: #e2e7ef; }
.btn.danger { background: var(--danger); }
.btn.ok { background: var(--ok); }
.alert { padding: 10px 12px; border-radius: 9px; font-size: 13px; margin-bottom: 16px; }
.alert.err { background: #fdecec; color: var(--danger); }
.alert.ok { background: #e8f7ef; color: var(--ok); }

/* 收件箱 */
.inbox-head { display: flex; align-items: center; justify-content: space-between; margin: 8px 0 16px; flex-wrap: wrap; gap: 10px; }
.inbox-head h2 { font-size: 18px; }
.mailbox { color: var(--sub); font-size: 13px; }
.mail-card { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 16px; margin-bottom: 12px; }
.mail-card .row1 { display: flex; justify-content: space-between; align-items: flex-start; gap: 10px; }
.mail-card .subject { font-weight: 600; font-size: 14px; }
.mail-card .time { color: var(--sub); font-size: 12px; white-space: nowrap; }
.mail-card .from { color: var(--sub); font-size: 12px; margin: 3px 0 10px; }
.code-box { background: linear-gradient(135deg,#f0f5ff,#e8f0ff); border: 1px dashed #b9cdfb;
  border-radius: 10px; padding: 12px 14px; display: flex; align-items: center; justify-content: space-between; gap: 10px; }
.code-box .code { font-size: 26px; font-weight: 700; letter-spacing: 3px; color: var(--brand); font-family: ui-monospace, Mento, Menlo, monospace; }
.code-box .copy { font-size: 12px; padding: 5px 10px; }
.snippet { color: var(--sub); font-size: 13px; margin-top: 10px; white-space: pre-wrap; word-break: break-all; }
.empty { text-align: center; color: var(--sub); padding: 70px 20px; }
.empty .big { font-size: 40px; margin-bottom: 10px; }

/* 管理后台 */
.tabs { display: flex; gap: 8px; margin-bottom: 18px; flex-wrap: wrap; }
.tabs a { padding: 8px 16px; border-radius: 9px; background: var(--card); border: 1px solid var(--line); color: var(--sub); font-size: 14px; }
.tabs a.on { background: var(--brand); color: #fff; border-color: var(--brand); }
.panel { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 18px; margin-bottom: 18px; }
.panel h3 { font-size: 15px; margin-bottom: 14px; }
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th, td { text-align: left; padding: 10px 8px; border-bottom: 1px solid var(--line); vertical-align: middle; }
th { color: var(--sub); font-weight: 500; font-size: 13px; }
tr:last-child td { border-bottom: none; }
.mono { font-family: ui-monospace, Menlo, monospace; font-size: 12px; word-break: break-all; }
.tag { display: inline-block; padding: 2px 8px; border-radius: 6px; font-size: 12px; }
.tag.on { background: #e8f7ef; color: var(--ok); }
.tag.off { background: #fdecec; color: var(--danger); }
.form-inline { display: flex; gap: 8px; flex-wrap: wrap; align-items: flex-end; }
.form-inline .field { margin-bottom: 0; }
.form-inline input { width: auto; min-width: 150px; }
.op a, .op button { margin-right: 6px; font-size: 13px; }
.muted { color: var(--sub); font-size: 13px; }
.api-doc { background: #f8fafc; border: 1px solid var(--line); border-radius: 10px; padding: 14px; font-size: 13px; }
.api-doc pre { background: #1f2733; color: #d6e2ff; padding: 12px; border-radius: 8px; overflow-x: auto; margin: 8px 0; font-size: 12px; }
@media (max-width: 600px) {
  .hide-sm { display: none; }
  .code-box .code { font-size: 22px; }
}