:root { --bg:#f5f6f8; --card:#fff; --text:#1f2430; --muted:#6b7280; --line:#e5e7eb; --accent:#203c80; --accent2:#c8100e; --danger:#c8100e; --ok:#16a34a; --sel:color-mix(in srgb, var(--accent) 12%, transparent); }
@media (prefers-color-scheme: dark) {
  :root { --bg:#0f1115; --card:#181b22; --text:#e6e8ee; --muted:#9aa1b2; --line:#2a2f3a; --accent:#7c9ae0; --accent2:#f0504a; --danger:#f87171; --ok:#4ade80; }
}
* { box-sizing: border-box; }
body { margin:0; font:15px/1.5 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif; background:var(--bg); color:var(--text); }
button, input, select { font:inherit; color:inherit; }
button { cursor:pointer; border:1px solid var(--line); background:var(--card); padding:6px 12px; border-radius:8px; white-space:nowrap; }
button:hover:not(:disabled) { border-color:var(--accent); }
button:disabled { opacity:.5; cursor:default; }
button.primary { background:var(--accent); border-color:var(--accent); color:#fff; }
button.danger:hover:not(:disabled) { border-color:var(--danger); color:var(--danger); }
button.icon { padding:3px 8px; font-size:14px; }
input[type=text], input[type=password], input[type=search], input[type=number], select { width:100%; padding:8px 12px; border:1px solid var(--line); border-radius:8px; background:var(--card); }
input[type=checkbox] { width:16px; height:16px; accent-color:var(--accent); cursor:pointer; vertical-align:middle; }
label.field { display:grid; gap:4px; font-size:14px; }
label.field > span { color:var(--muted); }
label.check { display:flex; gap:8px; align-items:center; font-size:14px; cursor:pointer; }
a { color:var(--accent); }
.hidden { display:none !important; }
.muted { color:var(--muted); font-size:14px; }
.err { color:var(--danger); font-size:14px; min-height:0; }
.err:empty { display:none; }
.ok { color:var(--ok); }
.row { display:flex; gap:8px; flex-wrap:wrap; align-items:center; }
.mono { font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace; background:var(--bg); border:1px solid var(--line); padding:10px 12px; border-radius:8px; word-break:break-all; letter-spacing:.04em; margin:0; white-space:pre-wrap; }
.badge { display:inline-block; font-size:12px; padding:1px 8px; border-radius:99px; border:1px solid var(--line); color:var(--muted); }
.badge.on { color:var(--ok); border-color:currentColor; }
.badge.warn { color:var(--danger); border-color:currentColor; }

/* đăng nhập */
#login { min-height:100vh; display:grid; place-items:center; padding:16px; }
#login form { background:var(--card); padding:28px; border-radius:14px; width:100%; max-width:340px; border:1px solid var(--line); display:grid; gap:12px; }
#login h1 { margin:0 0 4px; font-size:22px; }

/* khung chính */
header { display:flex; justify-content:space-between; align-items:center; gap:12px; flex-wrap:wrap; padding:10px 20px; background:var(--card); border-bottom:1px solid var(--line); }
header h1 { margin:0; font-size:18px; }
header h1 a { color:inherit; text-decoration:none; }
main { max-width:1080px; margin:20px auto; padding:0 16px 120px; }
.toolbar { display:flex; gap:8px; flex-wrap:wrap; align-items:center; margin-bottom:12px; }
.toolbar .grow { flex:1; min-width:140px; }
.crumbs { display:flex; flex-wrap:wrap; gap:4px; align-items:center; margin-bottom:12px; color:var(--muted); }
.crumbs a { color:var(--accent); cursor:pointer; text-decoration:none; }
.crumbs a:hover { text-decoration:underline; }
.selbar { display:flex; gap:8px; flex-wrap:wrap; align-items:center; padding:8px 12px; margin-bottom:10px; border:1px solid var(--accent); border-radius:10px; background:var(--sel); position:sticky; top:8px; z-index:5; }
.selbar b { margin-right:auto; }
.ro-note { margin-bottom:12px; }

.panel { background:var(--card); border:1px solid var(--line); border-radius:12px; overflow:hidden; position:relative; }
.panel.drag { outline:2px dashed var(--accent); outline-offset:-6px; }
.panel.drag::after { content:'Thả file hoặc thư mục vào đây để tải lên'; position:absolute; inset:0; display:grid; place-items:center; background:color-mix(in srgb, var(--card) 80%, transparent); font-weight:600; color:var(--accent); pointer-events:none; }
table { width:100%; border-collapse:collapse; }
th, td { padding:9px 12px; text-align:left; border-bottom:1px solid var(--line); white-space:nowrap; }
th { font-size:12px; text-transform:uppercase; letter-spacing:.04em; color:var(--muted); user-select:none; }
th[data-k] { cursor:pointer; }
th.sorted::after { content:' ▲'; }
th.sorted.desc::after { content:' ▼'; }
tr:last-child td { border-bottom:none; }
tbody tr:hover { background:color-mix(in srgb, var(--accent) 5%, transparent); }
tbody tr.sel { background:var(--sel); }
td.cb, th.cb { width:36px; padding-right:0; }
td.name { width:100%; max-width:0; overflow:hidden; text-overflow:ellipsis; }
td.name a { color:inherit; text-decoration:none; cursor:pointer; }
td.name a:hover { color:var(--accent); text-decoration:underline; }
td.meta { color:var(--muted); font-size:13px; }
td.actions { text-align:right; }
td.actions button { margin-left:2px; }
.empty { padding:40px; text-align:center; color:var(--muted); }
.scroll { overflow-x:auto; }
@media (max-width: 640px) {
  .hide-sm { display:none; }
  main { padding:0 8px 120px; }
  header { padding:10px 12px; }
  th, td { padding:8px 6px; }
  td.actions button.icon { padding:2px 5px; margin-left:0; }
}
@media (max-width: 480px) { .hide-xs { display:none; } }

/* upload */
#uploads { position:fixed; right:16px; bottom:16px; width:360px; max-width:calc(100vw - 32px); z-index:20; background:var(--card); border:1px solid var(--line); border-radius:12px; box-shadow:0 6px 24px rgba(0,0,0,.18); font-size:13px; }
#uploads .uh { display:flex; align-items:center; gap:8px; padding:10px 12px; }
#uploads .uh b { flex:1; }
#uploads .uh button { padding:2px 8px; }
#uploads .bar { height:6px; background:var(--line); border-radius:3px; overflow:hidden; }
#uploads .bar i { display:block; height:100%; width:0; background:var(--accent); transition:width .15s; }
#uploads > .bar { margin:0 12px 10px; }
#uploads .ul { max-height:38vh; overflow:auto; border-top:1px solid var(--line); }
#uploads.min .ul { display:none; }
.up { padding:8px 12px; border-bottom:1px solid var(--line); }
.up:last-child { border-bottom:none; }
.up .t { display:flex; justify-content:space-between; gap:8px; margin-bottom:4px; }
.up .t span:first-child { overflow:hidden; text-overflow:ellipsis; white-space:nowrap; }
.up .t span:last-child { flex-shrink:0; color:var(--muted); }
.up.fail .bar i { background:var(--danger); }
.up.fail .t span:last-child { color:var(--danger); white-space:normal; text-align:right; }

/* hộp thoại */
dialog { border:1px solid var(--line); border-radius:14px; background:var(--card); color:var(--text); padding:0; width:min(520px,94vw); max-height:90vh; }
dialog.wide { width:min(900px,96vw); }
dialog::backdrop { background:rgba(0,0,0,.5); }
.dlg { padding:20px; display:grid; gap:12px; }
.dlg h2 { margin:0; font-size:18px; }
.dlg .body { display:grid; gap:12px; min-width:0; }
.dlg .body p { margin:0; }
.dlg .foot { display:flex; justify-content:flex-end; gap:8px; flex-wrap:wrap; }
.dlg .foot .left { margin-right:auto; }
.tablewrap { max-height:55vh; overflow:auto; border:1px solid var(--line); border-radius:10px; }
.tablewrap table { font-size:13px; }
.tablewrap td, .tablewrap th { padding:6px 10px; }
.tablewrap td.wrap { white-space:normal; word-break:break-word; }
.tablewrap th { position:sticky; top:0; background:var(--card); z-index:1; }
tr.warn td { background:color-mix(in srgb, var(--danger) 9%, transparent); }
tr.dim td { opacity:.55; }
.section { border-top:1px solid var(--line); padding-top:12px; display:grid; gap:10px; }
.section h3 { margin:0; font-size:15px; }
.grid2 { display:grid; grid-template-columns:1fr 1fr; gap:12px; }
@media (max-width: 520px) { .grid2 { grid-template-columns:1fr; } }

/* chọn thư mục */
.picker { border:1px solid var(--line); border-radius:10px; max-height:46vh; min-height:160px; overflow:auto; }
.picker div[data-p] { padding:8px 12px; cursor:pointer; border-bottom:1px solid var(--line); }
.picker div[data-p]:last-child { border-bottom:none; }
.picker div[data-p]:hover { background:var(--sel); }
.picker div.off { opacity:.45; cursor:not-allowed; }
.picker div.off:hover { background:none; }
.picker .empty { padding:24px; }

/* xem trước */
dialog.viewer { width:min(1200px,96vw); height:92vh; max-height:none; }
dialog.viewer .vw { display:grid; grid-template-rows:auto 1fr; height:100%; }
dialog.viewer .vh { display:flex; align-items:center; gap:8px; padding:10px 12px; border-bottom:1px solid var(--line); }
dialog.viewer .vh .vn { flex:1; overflow:hidden; text-overflow:ellipsis; white-space:nowrap; font-weight:600; }
dialog.viewer .vb { position:relative; overflow:auto; display:grid; place-items:center; background:var(--bg); min-height:0; }
dialog.viewer .vb img, dialog.viewer .vb video { max-width:100%; max-height:100%; object-fit:contain; display:block; }
dialog.viewer .vb iframe { width:100%; height:100%; border:0; background:#fff; }
dialog.viewer .vb pre { margin:0; padding:16px; width:100%; height:100%; overflow:auto; font:13px/1.5 ui-monospace,SFMono-Regular,Menlo,Consolas,monospace; white-space:pre-wrap; word-break:break-word; place-self:stretch; }
dialog.viewer .nav { position:absolute; top:50%; transform:translateY(-50%); font-size:22px; padding:10px 14px; opacity:.85; }
dialog.viewer .nav.prev { left:10px; } dialog.viewer .nav.next { right:10px; }

/* toast */
#toasts { position:fixed; left:50%; transform:translateX(-50%); bottom:20px; top:auto; right:auto; margin:0; padding:0; border:0; background:transparent; overflow:visible;
  display:grid; gap:8px; z-index:1000; width:max-content; max-width:calc(100vw - 32px); color:inherit; }
#toasts:empty { display:none; }
.toast { background:var(--text); color:var(--bg); padding:10px 16px; border-radius:10px; font-size:14px; box-shadow:0 4px 14px rgba(0,0,0,.2); }
.toast.err { background:var(--danger); color:#fff; }

/* trang chia sẻ */
.share-card { background:var(--card); border:1px solid var(--line); border-radius:14px; padding:28px; text-align:center; display:grid; gap:12px; max-width:480px; margin:40px auto; }
.share-card .big { font-size:56px; line-height:1; }
.share-card .fname { font-size:18px; font-weight:600; word-break:break-word; }
.share-card .row { justify-content:center; }

/* mã QR 2FA (nền trắng để quét được cả ở chế độ tối) */
.qrbox { width:220px; max-width:100%; margin:0 auto; padding:8px; background:#fff; border-radius:10px; border:1px solid var(--line); }
.qrbox svg { display:block; width:100%; height:auto; }
details summary { cursor:pointer; }
details[open] { display:grid; gap:8px; }

/* xem trước Office */
dialog.viewer .vb .office, dialog.viewer .vb .sheetwrap, dialog.viewer .vb .docpage, dialog.viewer .vb .slides { place-self:stretch; width:100%; min-height:100%; }
dialog.viewer .vb .office { overflow:auto; display:grid; }
.sheetwrap { display:grid; grid-template-rows:1fr auto; height:100%; min-height:0; }
.sheetholder { min-height:0; overflow:hidden; display:grid; }
.sheetscroll { overflow:auto; background:var(--card); }
.sheettabs { display:flex; gap:4px; padding:6px 8px; border-top:1px solid var(--line); background:var(--card); overflow-x:auto; }
.sheettabs button { border-radius:6px; font-size:13px; padding:3px 10px; }
.sheettabs button.on { background:var(--accent); border-color:var(--accent); color:#fff; }
table.xl { border-collapse:collapse; font-size:13px; width:max-content; min-width:100%; }
table.xl th, table.xl td { border:1px solid var(--line); padding:3px 8px; white-space:pre-wrap; max-width:420px; vertical-align:top; text-transform:none; letter-spacing:0; }
table.xl th { background:var(--bg); color:var(--muted); font-weight:500; text-align:center; position:sticky; top:0; z-index:1; font-size:12px; }
table.xl tbody th { position:sticky; left:0; top:auto; z-index:0; min-width:36px; }
table.xl th.corner { left:0; z-index:2; }
table.xl td.num { text-align:right; font-variant-numeric:tabular-nums; white-space:nowrap; }
table.xl td.merged { text-align:center; font-weight:600; }
.docpage { background:#fff; color:#1f2430; max-width:820px; margin:0 auto; padding:40px 48px; line-height:1.6; box-shadow:0 2px 12px rgba(0,0,0,.12); }
.docpage p { margin:0 0 8px; white-space:pre-wrap; }
.docpage p.li::before { content:'• '; }
.docpage h2, .docpage h3, .docpage h4, .docpage h5 { margin:16px 0 8px; white-space:pre-wrap; }
.docpage .b { font-weight:700; } .docpage .i { font-style:italic; } .docpage .u { text-decoration:underline; }
.doctable { border-collapse:collapse; margin:8px 0 12px; width:100%; }
.doctable td { border:1px solid #c9ced6; padding:4px 8px; white-space:pre-wrap; vertical-align:top; }
.slides { display:grid; gap:16px; padding:16px; align-content:start; }
.slide { background:var(--card); border:1px solid var(--line); border-radius:10px; padding:20px 24px; max-width:900px; width:100%; margin:0 auto; }
.slide h3 { margin:0 0 10px; font-size:20px; }
.slide p { margin:0 0 6px; white-space:pre-wrap; }
.slideno { font-size:12px; color:var(--muted); margin-bottom:6px; }
.slide .notes { margin-top:12px; padding-top:8px; border-top:1px dashed var(--line); color:var(--muted); font-size:13px; white-space:pre-wrap; }
@media (max-width: 640px) { .docpage { padding:20px 16px; } }

table.xl tr:last-child td, table.xl tr:last-child th, .doctable tr:last-child td { border-bottom:1px solid var(--line); }
.doctable tr:last-child td { border-bottom-color:#c9ced6; }
dialog.viewer .vnav { display:flex; gap:4px; }
dialog.viewer .vnav button { padding:4px 12px; font-size:16px; line-height:1; }

/* hình nhúng trong file Office */
.oimg { max-width:100%; height:auto; display:block; margin:8px 0; border-radius:4px; }
.docpage .oimg { display:inline-block; vertical-align:middle; max-height:900px; }
.slideimgs { display:flex; flex-wrap:wrap; gap:10px; margin-top:8px; }
.slideimgs .oimg { max-height:420px; max-width:100%; margin:0; border:1px solid var(--line); }
.xlmedia { padding:12px; display:flex; flex-wrap:wrap; gap:12px; align-items:flex-start; border-top:1px solid var(--line); }
.xlmedia > p { flex-basis:100%; margin:0; }
.xlmedia figure { margin:0; max-width:420px; }
.xlmedia figcaption { font-size:12px; }
.badge.imgna { display:inline-block; margin:6px 0; white-space:normal; }

input[type=datetime-local] { width:100%; padding:8px 12px; border:1px solid var(--line); border-radius:8px; background:var(--card); color:inherit; font:inherit; margin-top:6px; }
div.field { display:grid; gap:4px; font-size:14px; }
label.field, div.field { align-content:start; }

/* thanh dung lượng */
.crumbbar { display:flex; justify-content:space-between; align-items:center; gap:12px; flex-wrap:wrap; margin-bottom:12px; }
.crumbbar .crumbs { margin-bottom:0; }
.usage { display:flex; align-items:center; gap:8px; font-size:13px; flex-wrap:wrap; }
.ubar { width:110px; height:6px; background:var(--line); border-radius:3px; overflow:hidden; display:inline-block; }
.ubar i { display:block; height:100%; background:var(--accent); }
.ubar.full i { background:var(--danger); }
/* trang chia sẻ: khu nhận file */
.dropzone { border:2px dashed var(--line); border-radius:14px; padding:28px; text-align:center; display:grid; gap:10px; background:var(--card); }
.dropzone.drag { border-color:var(--accent); background:var(--sel); }
.uplist { display:grid; gap:6px; text-align:left; }
.uplist .up { border:1px solid var(--line); border-radius:8px; }

.uplist .bar { height:6px; background:var(--line); border-radius:3px; overflow:hidden; }
.uplist .bar i { display:block; height:100%; width:0; background:var(--accent); transition:width .15s; }
.uplist .up.fail .bar i { background:var(--danger); }

header button.danger { border-color:var(--danger); color:var(--danger); }
code { font-family:ui-monospace,Menlo,Consolas,monospace; font-size:.92em; }

/* ===== Logo PTG ===== */
.brand { display:inline-flex; align-items:center; gap:10px; }
.brand img { height:28px; width:auto; display:block; }
.login-logo { height:56px; width:auto; justify-self:center; margin-bottom:4px; }
#login h1 { text-align:center; }
@media (max-width:600px) { .brand img { height:24px; } }
@media (prefers-color-scheme: dark) {
  .brand img, .login-logo { background:#fff; border-radius:6px; padding:3px 6px; box-sizing:content-box; }
  .login-logo { padding:6px 10px; border-radius:10px; }
}

/* ===== Mau PTG ===== */
header { border-bottom:3px solid transparent; border-image:linear-gradient(90deg,#c8100e 0 35%,#203c80 35% 100%) 1; }
button.primary { background:linear-gradient(180deg,#2a4a9a,#1c3270); border-color:#1c3270; }
button.primary:hover:not(:disabled) { background:linear-gradient(180deg,#d4211c,#a80c0a); border-color:#a80c0a; }
button:hover:not(:disabled) { border-color:var(--accent2); }
#login form { border-top:4px solid #c8100e; }
@media (prefers-color-scheme: dark) {
  button.primary { background:linear-gradient(180deg,#34559f,#203c80); border-color:#34559f; color:#fff; }
}