:root {
  --bg: #f6f6f4; --card: #fff; --fg: #1f1f1f; --muted: #7a7a7a; --line: #e6e6e2;
  --accent: #2b6cb0; --accent-bg: #e8f0fa; --danger: #c53030; --hover: #f0f0ec;
  --radius: 10px; --nav-h: 0px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #161616; --card: #212121; --fg: #e4e4e4; --muted: #8d8d8d; --line: #333;
    --accent: #5a9be0; --accent-bg: #1f2c3b; --danger: #e46262; --hover: #2a2a2a;
    color-scheme: dark;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--fg);
  font: 15px/1.5 system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
}
[hidden] { display: none !important; }
button, .btn {
  font: inherit; font-size: 14px; color: var(--fg); background: var(--card);
  border: 1px solid var(--line); border-radius: 8px; padding: 6px 12px; min-height: 34px;
  cursor: pointer; text-decoration: none; display: inline-flex; align-items: center; justify-content: center;
  gap: 4px; white-space: nowrap; -webkit-tap-highlight-color: transparent;
}
button:hover, .btn:hover { background: var(--hover); }
button:disabled { opacity: .45; cursor: default; }
button.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
button.danger { color: var(--danger); }
button.danger.solid { background: var(--danger); border-color: var(--danger); color: #fff; }
button.ghost { border-color: transparent; background: transparent; color: var(--muted); }
input, textarea {
  font: inherit; color: var(--fg); background: var(--bg); border: 1px solid var(--line);
  border-radius: 8px; padding: 7px 10px; min-width: 0;
}
input[type=checkbox] { width: 18px; height: 18px; margin: 0; accent-color: var(--accent); cursor: pointer; }
textarea { resize: vertical; }
a { color: var(--accent); }
.muted { color: var(--muted); }
.small { font-size: 13px; }
.grow { flex: 1; }

/* 登录 */
#login { min-height: 100vh; display: flex; align-items: center; justify-content: center; padding: 16px; }
.login-box {
  width: 100%; max-width: 320px; background: var(--card); padding: 28px 24px; border-radius: 14px;
  display: flex; flex-direction: column; gap: 12px; box-shadow: 0 1px 3px rgba(0,0,0,.08);
}
.login-box h1 { margin: 0 0 8px; font-size: 22px; text-align: center; }
.login-box input, .login-box button { min-height: 42px; }

/* 顶栏与导航 */
header {
  max-width: 1000px; margin: 0 auto; padding: 12px 16px 4px; display: flex; align-items: center; gap: 8px;
}
.brand { font-weight: 700; font-size: 18px; margin-right: auto; }
.pill { border-radius: 999px; font-size: 13px; min-height: 30px; padding: 4px 12px; max-width: 46vw; }
#devname { overflow: hidden; text-overflow: ellipsis; display: block; }
nav#tabs {
  max-width: 1000px; margin: 0 auto; padding: 8px 16px; display: flex; gap: 6px;
  position: sticky; top: 0; z-index: 5; background: var(--bg);
}
nav#tabs button { border: none; background: transparent; color: var(--muted); font-size: 15px; }
nav#tabs button.on { background: var(--card); color: var(--fg); font-weight: 600; box-shadow: 0 1px 2px rgba(0,0,0,.08); }
nav#tabs .ico { display: none; }
main { max-width: 1000px; margin: 0 auto; padding: 4px 16px 40px; }
h2 { font-size: 15px; margin: 22px 0 8px; color: var(--muted); font-weight: 600; }

.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 12px; margin-bottom: 12px; }
.sec-title { font-weight: 600; margin-bottom: 8px; }

/* 剪贴板同步区 */
.sync { display: flex; flex-direction: column; gap: 10px; }
.sync-row { display: flex; gap: 8px; align-items: center; }
.sync-row textarea { flex: 1; }
.switch { display: inline-flex; align-items: center; gap: 6px; font-size: 14px; cursor: pointer; white-space: nowrap; }

/* 列表工具栏 */
.toolbar { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; margin: 10px 0; }
.toolbar .group { display: flex; align-items: center; gap: 6px; flex-wrap: wrap; }
.toolbar input[type=date] { padding: 5px 8px; min-height: 34px; }
.toolbar .sep { flex: 1; }
.toolbar .selinfo { display: inline-flex; align-items: center; gap: 6px; font-size: 14px; color: var(--muted); cursor: pointer; }
button.on-toggle { background: var(--accent-bg); border-color: var(--accent); color: var(--accent); }

/* 列表项 */
.list { display: flex; flex-direction: column; gap: 8px; }
.day-head { font-size: 13px; color: var(--muted); margin: 10px 2px 0; }
.empty { text-align: center; color: var(--muted); padding: 28px 0; font-size: 14px; }
.item {
  display: grid; grid-template-columns: auto 1fr auto; gap: 10px; align-items: center;
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 10px 12px;
}
.item.sel { border-color: var(--accent); background: var(--accent-bg); }
.item.clip { cursor: pointer; }
.item.clip:hover { border-color: var(--accent); }
.item .body { min-width: 0; }
.item .text {
  white-space: pre-wrap; word-break: break-word; overflow: hidden;
  display: -webkit-box; -webkit-line-clamp: 5; -webkit-box-orient: vertical;
}
.item .text.full { display: block; }
.item img.thumb { max-width: 100%; max-height: 220px; border-radius: 6px; display: block; background: var(--hover); }
.item .meta { font-size: 12.5px; color: var(--muted); margin-top: 3px; display: flex; flex-wrap: wrap; gap: 0 10px; }
.item .name { word-break: break-all; font-weight: 500; color: var(--fg); text-decoration: none; }
.item .name:hover { text-decoration: underline; }
.item .size { font-variant-numeric: tabular-nums; color: var(--fg); }
.item .acts { display: flex; gap: 6px; flex-wrap: wrap; justify-content: flex-end; }
.item .acts button, .item .acts .btn { min-height: 30px; padding: 3px 10px; font-size: 13px; }
.code { font-family: ui-monospace, Menlo, Consolas, monospace; letter-spacing: .5px; }
.more { font-size: 12.5px; color: var(--accent); background: none; border: none; padding: 0; min-height: 0; }

/* 上传 */
.drop {
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 2px;
  border: 2px dashed var(--line); min-height: 110px; cursor: pointer; text-align: center;
}
.drop.over, body.dragging #tab-files .drop { border-color: var(--accent); background: var(--accent-bg); }
.up { display: grid; grid-template-columns: 1fr auto; gap: 4px 10px; font-size: 13.5px; padding: 8px 12px; }
.up .nm { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.bar { grid-column: 1 / -1; height: 5px; background: var(--line); border-radius: 3px; overflow: hidden; }
.bar > i { display: block; height: 100%; background: var(--accent); width: 0; transition: width .2s; }
.bar.ok > i { background: #38a169; }
.bar.fail > i { background: var(--danger); }

/* P2P */
#peers { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 8px; }
.peer {
  display: flex; align-items: center; gap: 10px; padding: 12px; border: 1px solid var(--line);
  border-radius: var(--radius); cursor: pointer; background: var(--bg); text-align: left; min-height: 56px;
  justify-content: flex-start; white-space: normal;
}
.peer:hover, .peer.over { border-color: var(--accent); background: var(--accent-bg); }
.peer .pi { font-size: 24px; }
.peer .pn { font-weight: 500; word-break: break-all; }
.xfer { border-top: 1px solid var(--line); padding: 10px 0; display: flex; flex-direction: column; gap: 6px; }
.xfer:first-child { border-top: none; padding-top: 0; }
.xfer .row { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; font-size: 14px; }
.xfer .got { display: flex; gap: 8px; align-items: center; font-size: 13.5px; }
.xfer .got .nm { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* 弹窗与提示 */
.overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,.45); z-index: 50;
  display: flex; align-items: center; justify-content: center; padding: 16px;
}
.modal {
  background: var(--card); border-radius: 14px; padding: 18px; width: 100%; max-width: 440px;
  max-height: calc(100vh - 32px); overflow: auto; box-shadow: 0 10px 40px rgba(0,0,0,.25);
}
.modal h3 { margin: 0 0 12px; font-size: 17px; word-break: break-all; }
.modal p { margin: 0 0 8px; }
.modal input[type=text], .modal input[type=number] { width: 100%; min-height: 40px; }
.mbtns { display: flex; justify-content: flex-end; gap: 8px; margin-top: 16px; }
.mbtns button { min-height: 38px; padding: 6px 16px; }
.share { text-align: center; }
.share + .share { border-top: 1px solid var(--line); margin-top: 14px; padding-top: 14px; }
.share .qr { width: 200px; height: 200px; margin: 0 auto; background: #fff; border-radius: 8px; padding: 6px; }
.share .qr svg { width: 100%; height: 100%; display: block; }
.share .link { font-size: 20px; font-weight: 600; margin: 10px 0 4px; word-break: break-all; }
.share .fname { font-size: 13px; color: var(--muted); word-break: break-all; }
.stats { display: grid; grid-template-columns: 1fr auto; gap: 6px 16px; font-size: 14px; }
.stats b { font-variant-numeric: tabular-nums; text-align: right; font-weight: 500; }
.meter { height: 8px; background: var(--line); border-radius: 4px; overflow: hidden; margin: 6px 0 14px; }
.meter > i { display: block; height: 100%; background: var(--accent); }
.flist { font-size: 13.5px; max-height: 40vh; overflow: auto; margin: 0; padding-left: 18px; }

#toast {
  position: fixed; left: 50%; bottom: calc(24px + var(--nav-h)); transform: translateX(-50%) translateY(20px);
  background: rgba(30,30,30,.92); color: #fff; padding: 8px 16px; border-radius: 8px; font-size: 14px;
  opacity: 0; pointer-events: none; transition: .2s; z-index: 60; max-width: calc(100vw - 32px); text-align: center;
}
#toast.show { opacity: 1; transform: translateX(-50%); }

/* 移动端：导航栏移到底部，列表操作按钮换行 */
@media (max-width: 700px) {
  :root { --nav-h: 58px; }
  body { font-size: 15px; }
  header { padding: 10px 12px 2px; gap: 6px; }
  .brand { font-size: 16px; }
  #logout { padding: 4px 6px; }
  main { padding: 4px 12px calc(var(--nav-h) + 24px + env(safe-area-inset-bottom)); }
  nav#tabs {
    position: fixed; top: auto; bottom: 0; left: 0; right: 0; max-width: none; margin: 0;
    padding: 4px 4px calc(4px + env(safe-area-inset-bottom)); gap: 0;
    background: var(--card); border-top: 1px solid var(--line);
  }
  nav#tabs button { flex: 1; flex-direction: column; gap: 0; font-size: 11.5px; min-height: 50px; padding: 2px; }
  nav#tabs button.on { box-shadow: none; background: transparent; color: var(--accent); }
  nav#tabs .ico { display: block; font-size: 20px; line-height: 1.2; }
  .item { grid-template-columns: auto 1fr; padding: 10px; }
  .item .acts { grid-column: 2; justify-content: flex-start; }
  .toolbar .sep { flex-basis: 100%; height: 0; }
  .sync-row:first-child { flex-wrap: wrap; }
  #sync-status { flex-basis: 100%; font-size: 13px; }
  .drop { min-height: 90px; }
}