/* 主题变量：亮/暗自动切换 */
:root {
  color-scheme: light dark;
  --bg: #f3f5f9;
  --card: #ffffff;
  --text: #1c2333;
  --muted: #687182;
  --border: #e2e6ee;
  --accent: #3b6cf0;
  --accent-hover: #2f57c9;
  --danger: #d64545;
  --ok: #1f9d61;
  --radius: 10px;
  --shadow: 0 1px 3px rgb(16 24 40 / 8%);
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12151c;
    --card: #1b202b;
    --text: #e6e9f0;
    --muted: #8b94a7;
    --border: #2a3140;
    --accent: #5b8af5;
    --accent-hover: #7aa0f7;
    --danger: #e06c6c;
    --ok: #3fbf82;
    --shadow: none;
  }
}

* { box-sizing: border-box; }
body {
  font: 15px/1.5 system-ui, "Segoe UI", sans-serif;
  margin: 0;
  background: var(--bg);
  color: var(--text);
}
main { max-width: 1100px; margin: 0 auto; padding: 1rem 1.25rem 3rem; }
h1 { font-size: 1.4rem; margin: 0 0 .25rem; }
h2 { font-size: 1.05rem; margin: 0 0 .75rem; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.muted { color: var(--muted); }
.err { color: var(--danger); }
code { font-size: .95em; background: color-mix(in srgb, var(--accent) 10%, transparent); padding: .1em .4em; border-radius: 4px; }
pre { white-space: pre-wrap; word-break: break-word; margin: .5rem 0 0; background: color-mix(in srgb, var(--border) 40%, transparent); padding: .6rem .75rem; border-radius: 8px; }

/* 卡片 */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1rem 1.25rem;
  margin-bottom: 1rem;
}
.card.narrow { max-width: 480px; }
.card-head { display: flex; align-items: center; justify-content: space-between; gap: .75rem; flex-wrap: wrap; margin-bottom: .5rem; }
.card-head h2 { margin: 0; }

/* 顶栏 */
header {
  display: flex; gap: .75rem; align-items: center; flex-wrap: wrap;
  padding: .75rem 0; margin-bottom: 1rem;
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0; background: var(--bg); z-index: 5;
}
.brand { font-weight: 700; margin-right: .5rem; }
header #who { margin-left: auto; font-size: .85rem; }
nav { display: flex; gap: .25rem; flex-wrap: wrap; }
nav button { background: none; border: 0; padding: .45rem .8rem; cursor: pointer; border-radius: 8px; color: var(--muted); font-weight: 500; }
nav button:hover { color: var(--text); background: color-mix(in srgb, var(--border) 50%, transparent); }
nav button.on { background: color-mix(in srgb, var(--accent) 14%, transparent); color: var(--accent); font-weight: 600; }

/* 表单控件 */
input, select, textarea, button {
  font: inherit; color: inherit;
  padding: .5rem .7rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--card);
}
input:focus, select:focus, textarea:focus { outline: 2px solid color-mix(in srgb, var(--accent) 45%, transparent); outline-offset: 0; border-color: var(--accent); }
textarea { resize: vertical; width: 100%; }
button { cursor: pointer; background: var(--card); }
button:hover { border-color: var(--accent); color: var(--accent); }
button:disabled { opacity: .5; cursor: default; }
button.primary { background: var(--accent); border-color: var(--accent); color: #fff; font-weight: 600; }
button.primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); }
button.ghost { border-color: transparent; background: none; color: var(--muted); }
button.ghost:hover { color: var(--accent); }
button.sm { padding: .25rem .55rem; font-size: .85rem; }
button.danger { color: var(--danger); }
button.danger:hover { border-color: var(--danger); color: var(--danger); }
label.check { display: flex; align-items: center; gap: .4rem; }
form.row { display: flex; flex-wrap: wrap; gap: .5rem; align-items: center; }
form.row.end, .row.end { display: flex; gap: .5rem; justify-content: flex-end; }
form.col, .col { display: grid; gap: .6rem; }
form.col label { display: grid; gap: .25rem; font-size: .85rem; color: var(--muted); }

/* 表格 */
.tablewrap { overflow-x: auto; }
table { border-collapse: collapse; width: 100%; margin-top: .5rem; }
th { font-size: .8rem; text-transform: uppercase; letter-spacing: .03em; color: var(--muted); }
th, td { text-align: left; padding: .5rem .6rem; border-bottom: 1px solid var(--border); white-space: nowrap; }
td { white-space: normal; }
tr:hover td { background: color-mix(in srgb, var(--border) 30%, transparent); }
td.empty { text-align: center; color: var(--muted); padding: 1.25rem; }
/* 序号列 */
th.idx, td.idx { width: 1%; text-align: right; color: var(--muted); font-variant-numeric: tabular-nums;
  padding-right: .35rem; font-size: .85rem; }
.maillist .idx { color: var(--muted); font-weight: 400; }
td.actions { display: flex; gap: .3rem; align-items: center; flex-wrap: wrap; }
.out { font-size: .9rem; }

/* 徽章 / 统计 */
.badge { display: inline-block; padding: .1rem .5rem; border-radius: 99px; font-size: .8rem; font-weight: 600; }
.badge.ok { color: var(--ok); background: color-mix(in srgb, var(--ok) 12%, transparent); }
.badge.bad { color: var(--danger); background: color-mix(in srgb, var(--danger) 12%, transparent); }
.chips { display: flex; gap: .5rem; flex-wrap: wrap; margin-bottom: 1rem; }
.chip { background: var(--card); border: 1px solid var(--border); border-radius: 99px; padding: .3rem .8rem; font-size: .85rem; color: var(--muted); }
.chip b { color: var(--text); }
.groups { margin: .25rem 0 .5rem; }
.groups .chip { cursor: pointer; }
.groups .chip:hover { border-color: var(--accent); color: var(--accent); }
.groups .chip.on { background: color-mix(in srgb, var(--accent) 14%, transparent); border-color: var(--accent); color: var(--accent); font-weight: 600; }
.groups .chip.on b { color: var(--accent); }
.tag { display: inline-block; padding: .1rem .5rem; border-radius: 6px; font-size: .8rem; background: color-mix(in srgb, var(--accent) 12%, transparent); color: var(--accent); }
.tag.sm { font-size: .75rem; padding: .05rem .4rem; background: color-mix(in srgb, var(--ok) 14%, transparent); color: var(--ok); }
/* 标签筛选条 */
.tagbar { margin: 0 0 .5rem; align-items: center; }
.tagbar:empty { display: none; }
.tagbar .lbl { font-size: .8rem; margin-right: .1rem; }
.tagbar .chip { cursor: pointer; font-size: .8rem; padding: .2rem .6rem; }
.tagbar .chip:hover { border-color: var(--ok); color: var(--ok); }
.tagbar .chip.on { background: color-mix(in srgb, var(--ok) 14%, transparent); border-color: var(--ok); color: var(--ok); font-weight: 600; }
/* 可点击编辑的标签单元格 */
td.tags { cursor: pointer; }
td.tags:hover { background: color-mix(in srgb, var(--ok) 8%, transparent); }
/* 内联链接（跳转关联邮箱） */
.lnk { color: var(--accent); cursor: pointer; text-decoration: underline dotted; }
/* 跳转后高亮目标行 */
@keyframes flash { from { background: color-mix(in srgb, var(--accent) 30%, transparent); } }
tr.flash td { animation: flash 1.6s ease-out; }
/* 二维码 */
.qrbox { display: grid; place-items: center; padding: .5rem; background: #fff; border-radius: 8px; }
.qrbox svg { width: 220px; height: 220px; }
.okc { color: var(--ok); }

/* 批量操作条 */
.bulkbar { display: flex; gap: .5rem; align-items: center; flex-wrap: wrap; padding: .5rem 0; border-top: 1px solid var(--border); }
.bulkbar .muted { margin-right: auto; font-size: .85rem; }

/* 折叠区 */
details summary { cursor: pointer; font-weight: 600; font-size: 1.05rem; }
details summary:hover { color: var(--accent); }

/* 导入预览 */
.tablewrap.scroll { max-height: 45vh; overflow-y: auto; }
tr.bad td { background: color-mix(in srgb, var(--danger) 7%, transparent); }
td.trunc { max-width: 22ch; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
input[type=file] { padding: .35rem; font-size: .85rem; }

/* 登录 */
#login { min-height: 100vh; display: grid; place-items: center; padding: 1rem; }
[hidden] { display: none !important; }
/* 未打开的弹窗必须隐藏：作者样式里的 display 会盖掉 UA 的 dialog:not([open]){display:none} */
dialog:not([open]) { display: none !important; }
.login-card { width: 100%; max-width: 340px; text-align: center; padding: 2rem 1.75rem; }
.login-card form { margin-top: 1rem; text-align: left; }

/* 弹窗 */
dialog {
  border: 1px solid var(--border); border-radius: var(--radius);
  background: var(--card); color: var(--text);
  padding: 1.25rem 1.5rem; width: min(420px, 92vw);
  max-height: 90vh; overflow-y: auto;
  box-shadow: 0 8px 30px rgb(0 0 0 / 25%);
}
dialog::backdrop { background: rgb(0 0 0 / 40%); }
dialog.wide { width: min(760px, 94vw); }
dialog.full { width: min(1100px, 96vw); height: min(80vh, 900px); display: flex; flex-direction: column; }

/* 邮件查看：左列表 / 右详情 */
.mailview { display: grid; grid-template-columns: 300px 1fr; gap: 1rem; flex: 1; min-height: 0; margin-top: .75rem; }
.maillist { list-style: none; margin: 0; padding: 0; overflow-y: auto; border-right: 1px solid var(--border); }
.maillist li { display: grid; gap: .15rem; padding: .6rem .7rem; border-bottom: 1px solid var(--border); cursor: pointer; border-radius: 8px 0 0 8px; }
.maillist li:hover { background: color-mix(in srgb, var(--border) 40%, transparent); }
.maillist li.on { background: color-mix(in srgb, var(--accent) 12%, transparent); }
.maillist li b { font-size: .9rem; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.maillist li small { font-size: .78rem; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.maildetail { overflow-y: auto; padding-right: .5rem; }
.maildetail h3 { margin: 0 0 .25rem; font-size: 1rem; }
.mailframe { width: 100%; height: 55vh; border: 1px solid var(--border); border-radius: 8px; background: #fff; }

/* 协议选择条 */
.toast.pick { display: flex; gap: .4rem; align-items: center; background: var(--card); color: var(--text); border: 1px solid var(--border); }
.toast.pick button { background: var(--card); }

@media (max-width: 720px) {
  .mailview { grid-template-columns: 1fr; grid-template-rows: 40% 1fr; }
  .maillist { border-right: 0; border-bottom: 1px solid var(--border); }
}

/* 提示条 */
#toasts { position: fixed; bottom: 1rem; left: 50%; transform: translateX(-50%); display: grid; gap: .5rem; z-index: 99; }
.toast {
  padding: .55rem 1.1rem; border-radius: 8px; font-size: .9rem;
  background: var(--text); color: var(--bg);
  box-shadow: 0 4px 12px rgb(0 0 0 / 25%);
  animation: pop .18s ease-out;
}
.toast.bad { background: var(--danger); color: #fff; }
@keyframes pop { from { opacity: 0; transform: translateY(6px); } }

/* 移动端 */
@media (max-width: 640px) {
  main { padding: .5rem .75rem 2rem; }
  .card { padding: .8rem .9rem; }
  header #who { display: none; }
  form.row input, form.row select { flex: 1 1 140px; }
}