:root {
  --bg: #f4f5f7; --panel: #fff; --text: #1d2330; --muted: #667085; --line: #d9dde3; --soft: #eef0f3;
  --accent: #2557d6; --accent-soft: #e6edfc; --ok: #1f8a4c; --ok-soft: #e3f4ea; --warn: #b26a00; --warn-soft: #fdf1dc;
  --bad: #c62f2f; --bad-soft: #fbe6e6; --info: #6941c6; --info-soft: #efeafc;
  --radius: 10px; --shadow: 0 1px 2px rgba(16,24,40,.06), 0 1px 3px rgba(16,24,40,.08);
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12151b; --panel: #1b1f27; --text: #e6e8ec; --muted: #9aa3b2; --line: #2f3542; --soft: #232834;
    --accent: #7aa2ff; --accent-soft: #1f2b47; --ok: #4cc584; --ok-soft: #173326; --warn: #f0b24e; --warn-soft: #3a2c13;
    --bad: #f07272; --bad-soft: #3d1c1c; --info: #b49cff; --info-soft: #2a2245; --shadow: none;
  }
}
* { box-sizing: border-box; }
html, body { margin: 0; background: var(--bg); color: var(--text); font: 14px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }
a { color: var(--accent); }
button, input, select, textarea { font: inherit; color: inherit; }
h1, h2, h3 { margin: 0; line-height: 1.25; }
h2 { font-size: 18px; } h3 { font-size: 15px; }
.muted { color: var(--muted); } .small { font-size: 12.5px; }
.row { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.spacer { flex: 1; }
.hidden { display: none !important; }

/* thanh trên */
header.top { background: var(--panel); border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 5; }
.top-inner { max-width: 1280px; margin: 0 auto; padding: 10px 16px; display: flex; gap: 8px 16px; align-items: center; flex-wrap: wrap; }
.brand { font-weight: 700; font-size: 16px; display: flex; gap: 8px; align-items: center; }
.brand .logo { width: 28px; height: 28px; border-radius: 8px; background: var(--accent); color: #fff; display: grid; place-items: center; font-size: 13px; }
nav.tabs { display: flex; gap: 2px; flex-wrap: wrap; }
nav.tabs button { border: 0; background: none; padding: 7px 12px; border-radius: 8px; cursor: pointer; color: var(--muted); font-weight: 500; }
nav.tabs button:hover { background: var(--soft); color: var(--text); }
nav.tabs button.active { background: var(--accent-soft); color: var(--accent); }
.who { text-align: right; line-height: 1.3; }
main { max-width: 1280px; margin: 0 auto; padding: 18px 16px 60px; }

/* khối */
.card { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); padding: 16px; }
.grid { display: grid; gap: 14px; }
.grid.cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.grid.cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
@media (max-width: 900px) { .grid.cols-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); } .grid.cols-2 { grid-template-columns: 1fr; } }
.stat .num { font-size: 26px; font-weight: 700; font-variant-numeric: tabular-nums; }
.stat .lbl { color: var(--muted); font-size: 13px; }
.section-title { display: flex; align-items: center; gap: 8px; margin: 22px 0 10px; flex-wrap: wrap; }

/* nút & ô nhập */
.btn { border: 1px solid var(--line); background: var(--panel); padding: 7px 12px; border-radius: 8px; cursor: pointer; font-weight: 500; white-space: nowrap; }
.btn:hover { background: var(--soft); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn.primary:hover { filter: brightness(1.08); }
.btn.ok { background: var(--ok); border-color: var(--ok); color: #fff; }
.btn.danger { color: var(--bad); }
.btn.sm { padding: 3px 8px; font-size: 12.5px; }
.btn:disabled { opacity: .5; cursor: default; }
input[type=text], input[type=password], input[type=date], input[type=url], input[type=search], select, textarea {
  width: 100%; padding: 7px 10px; border: 1px solid var(--line); border-radius: 8px; background: var(--panel);
}
textarea { min-height: 80px; resize: vertical; }
input:focus, select:focus, textarea:focus { outline: 2px solid var(--accent-soft); border-color: var(--accent); }
label.f { display: block; margin-bottom: 12px; }
label.f > span { display: block; font-weight: 500; margin-bottom: 4px; font-size: 13px; }
.seg { display: inline-flex; border: 1px solid var(--line); border-radius: 8px; overflow: hidden; background: var(--panel); }
.seg button { border: 0; background: none; padding: 6px 12px; cursor: pointer; color: var(--muted); }
.seg button + button { border-left: 1px solid var(--line); }
.seg button.active { background: var(--accent-soft); color: var(--accent); font-weight: 600; }

/* nhãn */
.pill { display: inline-block; padding: 1px 8px; border-radius: 99px; font-size: 12px; font-weight: 600; white-space: nowrap; }
.st-todo { background: var(--soft); color: var(--muted); }
.st-doing { background: var(--accent-soft); color: var(--accent); }
.st-submitted { background: var(--warn-soft); color: var(--warn); }
.st-done { background: var(--ok-soft); color: var(--ok); }
.st-rework { background: var(--bad-soft); color: var(--bad); }
.pill.overdue { background: var(--bad); color: #fff; }
.pill.prio-high { background: var(--bad-soft); color: var(--bad); }
.coh { display: inline-block; min-width: 34px; text-align: center; padding: 0 6px; border-radius: 6px; font-size: 11.5px; font-weight: 700; color: #fff; }

/* bảng */
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius); background: var(--panel); }
table { width: 100%; border-collapse: collapse; }
th, td { padding: 9px 12px; text-align: left; border-bottom: 1px solid var(--line); vertical-align: middle; }
th { font-size: 12.5px; color: var(--muted); font-weight: 600; background: var(--soft); white-space: nowrap; }
tr:last-child td { border-bottom: 0; }
tr.click { cursor: pointer; } tr.click:hover td { background: var(--soft); }
td.num, th.num { text-align: right; font-variant-numeric: tabular-nums; }
.empty { padding: 28px; text-align: center; color: var(--muted); }

/* thanh tiến độ */
.bar { height: 6px; background: var(--soft); border-radius: 99px; overflow: hidden; min-width: 60px; }
.bar > i { display: block; height: 100%; background: var(--ok); border-radius: 99px; }

/* cây dạng danh sách */
.tree { padding: 6px 0; }
.tree ul { list-style: none; margin: 0; padding-left: 22px; border-left: 1px dashed var(--line); margin-left: 11px; }
.tree > ul { border: 0; padding-left: 0; margin-left: 0; }
.tnode { display: flex; align-items: center; gap: 10px; padding: 6px 8px; border-radius: 8px; flex-wrap: wrap; }
.tnode:hover { background: var(--soft); }
.tnode .tog { width: 20px; height: 20px; border: 0; background: none; cursor: pointer; color: var(--muted); border-radius: 4px; padding: 0; }
.tnode .tog:hover { background: var(--line); }
.tnode .nm { font-weight: 600; cursor: pointer; }
.tnode .nm:hover { color: var(--accent); }
.tnode .prog { display: flex; align-items: center; gap: 6px; width: 170px; }
.tnode .prog .bar { flex: 1; }
li.collapsed > ul { display: none; }

/* sơ đồ tổ chức */
.org-wrap { overflow: auto; padding: 10px 0 20px; }
.org { display: inline-block; min-width: 100%; text-align: center; transform-origin: top left; }
.org ul { padding-top: 20px; position: relative; display: flex; justify-content: center; margin: 0; padding-left: 0; }
.org li { list-style: none; position: relative; padding: 20px 5px 0; display: flex; flex-direction: column; align-items: center; }
.org li::before, .org li::after { content: ''; position: absolute; top: 0; right: 50%; border-top: 2px solid var(--line); width: 50%; height: 20px; }
.org li::after { right: auto; left: 50%; border-left: 2px solid var(--line); }
.org li:only-child::before, .org li:only-child::after { display: none; }
.org li:only-child { padding-top: 0; }
.org li:first-child::before, .org li:last-child::after { border: 0 none; }
.org li:last-child::before { border-right: 2px solid var(--line); border-radius: 0 8px 0 0; }
.org li:first-child::after { border-radius: 8px 0 0 0; }
.org ul ul::before { content: ''; position: absolute; top: 0; left: 50%; border-left: 2px solid var(--line); height: 20px; }
.org > ul { padding-top: 0; }
.onode { background: var(--panel); border: 1px solid var(--line); border-top: 4px solid var(--c, var(--accent)); border-radius: 10px; padding: 8px 10px; width: 150px; cursor: pointer; text-align: left; box-shadow: var(--shadow); }
.onode:hover { border-color: var(--accent); }
.onode .n { font-weight: 600; font-size: 13px; line-height: 1.3; }
.onode .m { display: flex; align-items: center; gap: 6px; margin-top: 6px; font-size: 11.5px; color: var(--muted); }
.onode .m .bar { flex: 1; min-width: 30px; }
.onode .flags { margin-top: 4px; display: flex; gap: 4px; flex-wrap: wrap; }
.onode .flags .pill { font-size: 10.5px; padding: 0 6px; }
.stack { display: flex; flex-direction: column; gap: 8px; padding-top: 20px; position: relative; }
.stack::before { content: ''; position: absolute; top: 0; left: 50%; border-left: 2px solid var(--line); height: 20px; }
.legend { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }
.flow { display: flex; gap: 6px; align-items: center; flex-wrap: wrap; }
.flow .arrow { color: var(--muted); }

/* hộp thoại */
.backdrop { position: fixed; inset: 0; background: rgba(15,20,30,.45); display: flex; align-items: flex-start; justify-content: center; padding: 40px 16px; overflow-y: auto; z-index: 20; }
.modal { background: var(--panel); border-radius: 14px; width: 100%; max-width: 720px; box-shadow: 0 20px 50px rgba(0,0,0,.25); }
.modal.wide { max-width: 900px; }
.modal-h { padding: 16px 18px; border-bottom: 1px solid var(--line); display: flex; gap: 10px; align-items: flex-start; }
.modal-b { padding: 16px 18px; }
.modal-f { padding: 12px 18px; border-top: 1px solid var(--line); display: flex; gap: 8px; justify-content: flex-end; flex-wrap: wrap; }
.x { border: 0; background: none; font-size: 22px; line-height: 1; cursor: pointer; color: var(--muted); padding: 0 4px; }
.kv { display: grid; grid-template-columns: 130px 1fr; gap: 6px 12px; margin-bottom: 14px; }
.kv > div:nth-child(odd) { color: var(--muted); }
@media (max-width: 560px) { .kv { grid-template-columns: 1fr; } .kv > div:nth-child(odd) { margin-top: 6px; } }
.box { border: 1px solid var(--line); border-radius: 10px; padding: 12px; margin-bottom: 14px; }
.box h3 { margin-bottom: 8px; }
.note { background: var(--soft); padding: 8px 10px; border-radius: 8px; white-space: pre-wrap; }
.note.bad { background: var(--bad-soft); }
.files { list-style: none; padding: 0; margin: 0; }
.files li { display: flex; gap: 8px; padding: 5px 0; border-bottom: 1px dashed var(--line); align-items: center; }
.files li:last-child { border-bottom: 0; }
.files li a { flex: 1; word-break: break-all; }
.timeline { list-style: none; margin: 0; padding: 0; }
.timeline li { padding: 6px 0 6px 14px; border-left: 2px solid var(--line); position: relative; }
.timeline li::before { content: ''; position: absolute; left: -5px; top: 12px; width: 8px; height: 8px; border-radius: 50%; background: var(--accent); }
.picker { max-height: 300px; overflow-y: auto; border: 1px solid var(--line); border-radius: 8px; padding: 6px 10px; }
.picker .grp { margin: 6px 0; }
.picker .grp-h { display: flex; align-items: center; gap: 8px; font-weight: 600; margin-bottom: 4px; }
.picker label { display: inline-flex; gap: 6px; align-items: center; margin: 2px 14px 2px 0; cursor: pointer; }
.drop { border: 2px dashed var(--line); border-radius: 10px; padding: 14px; text-align: center; color: var(--muted); }
.drop.over { border-color: var(--accent); background: var(--accent-soft); }

/* đăng nhập */
.center { min-height: 100vh; display: grid; place-items: center; padding: 16px; }
.login { width: 100%; max-width: 380px; }
.login .brand { justify-content: center; margin-bottom: 16px; font-size: 18px; }
.err { color: var(--bad); min-height: 20px; font-size: 13px; }

.bell { position: relative; }
.bell .badge { position: absolute; top: -6px; right: -6px; background: var(--bad); color: #fff; border-radius: 99px; font-size: 10.5px; min-width: 17px; height: 17px; line-height: 17px; padding: 0 4px; font-weight: 700; }
.warn-card { border-color: var(--bad); background: linear-gradient(var(--bad-soft), var(--bad-soft)) padding-box; }
.notif { list-style: none; margin: 0; padding: 0; }
.notif li { display: flex; gap: 10px; align-items: flex-start; padding: 9px 6px; border-bottom: 1px solid var(--line); cursor: pointer; border-radius: 6px; }
.notif li:hover { background: var(--soft); }
.notif li.unread { font-weight: 600; }
details summary { cursor: pointer; }
#toast { position: fixed; bottom: 20px; left: 50%; transform: translateX(-50%); z-index: 50; display: flex; flex-direction: column; gap: 6px; align-items: center; pointer-events: none; }
#toast .t { background: var(--text); color: var(--bg); padding: 9px 16px; border-radius: 8px; box-shadow: 0 6px 20px rgba(0,0,0,.2); }
#toast .t.bad { background: var(--bad); color: #fff; }
code { background: var(--soft); padding: 1px 5px; border-radius: 4px; font-size: 12.5px; word-break: break-all; }