:root {
  --bg: #f5f7fb;
  --panel: #ffffff;
  --text: #0f172a;
  --muted: #64748b;
  --line: #e2e8f0;
  --primary: #1d4ed8;
  --primary-ink: #ffffff;
  --primary-soft: #e0e7ff;
  --danger: #dc2626;
  --danger-soft: #fee2e2;
  --ok: #15803d;
  --ok-soft: #dcfce7;
  --warn: #b45309;
  --warn-soft: #fef3c7;
  --hover: #f1f5f9;
  --shadow: 0 1px 2px rgba(15, 23, 42, .06), 0 4px 16px rgba(15, 23, 42, .06);
  --radius: 10px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b1120;
    --panel: #111a2e;
    --text: #e2e8f0;
    --muted: #94a3b8;
    --line: #1f2b45;
    --primary: #3b82f6;
    --primary-soft: #1e2a4a;
    --danger: #f87171;
    --danger-soft: #3b1518;
    --ok: #4ade80;
    --ok-soft: #12301f;
    --warn: #fbbf24;
    --warn-soft: #33270b;
    --hover: #17223a;
    --shadow: 0 1px 2px rgba(0, 0, 0, .3);
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  font: 14px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
}
[hidden] { display: none !important; }
a { color: var(--primary); }
h1 { font-size: 20px; margin: 0; }
h2 { font-size: 15px; margin: 0 0 12px; }
.muted { color: var(--muted); }
.small { font-size: 12px; }
.error { color: var(--danger); margin: 0; }
.nowrap { white-space: nowrap; }
.mt { margin-top: 16px; }
.spacer { height: 14px; }

/* ---------- Thanh trên ---------- */
.topbar {
  position: sticky; top: 0; z-index: 10;
  display: flex; align-items: center; gap: 24px;
  padding: 0 24px; height: 56px;
  background: var(--panel); border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 15px; white-space: nowrap; }
.brand-lg { font-size: 20px; margin-bottom: 4px; }
.logo {
  width: 26px; height: 26px; border-radius: 7px; background: var(--primary); position: relative; flex: none;
}
.logo::after {
  content: ""; position: absolute; left: 6px; right: 6px; top: 8px; height: 10px;
  border-top: 2.5px solid #fff; border-bottom: 2.5px solid #fff;
}
.tabs { display: flex; gap: 4px; flex: 1; overflow-x: auto; scrollbar-width: none; }
.tabs a {
  padding: 8px 12px; border-radius: 8px; color: var(--muted); text-decoration: none; font-weight: 500; white-space: nowrap;
}
.tabs a:hover { background: var(--hover); color: var(--text); }
.tabs a.active { background: var(--primary-soft); color: var(--primary); }

.content { max-width: 1240px; margin: 0 auto; padding: 24px; }
.page-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 16px; flex-wrap: wrap; }
.page-head .actions { display: flex; gap: 8px; flex-wrap: wrap; }

/* ---------- Thẻ / bảng ---------- */
.panel { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); }
.panel-pad { padding: 16px 18px; }
.grid { display: grid; gap: 16px; }
.cards { grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); margin-bottom: 16px; }
.card .label { color: var(--muted); font-size: 12px; text-transform: uppercase; letter-spacing: .04em; }
.card .value { font-size: 26px; font-weight: 700; margin-top: 4px; }
.card .value.sm { font-size: 18px; line-height: 1.6; }
.grid > * { min-width: 0; }
.card .sub { color: var(--muted); font-size: 12px; margin-top: 2px; }
.two-col { grid-template-columns: 1fr 1fr; }
@media (max-width: 860px) { .two-col { grid-template-columns: 1fr; } }

.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { font-size: 12px; font-weight: 600; color: var(--muted); background: var(--panel); position: sticky; top: 0; }
tbody tr:hover { background: var(--hover); }
tbody tr.clickable { cursor: pointer; }
tbody tr:last-child td { border-bottom: 0; }
td.subject { min-width: 260px; }
td.subject .title { font-weight: 500; }
td.subject .preview { color: var(--muted); font-size: 12px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
td.check, th.check { width: 36px; }
td.emp { min-width: 150px; }
td.actions { white-space: nowrap; text-align: right; }
.empty { padding: 40px 16px; text-align: center; color: var(--muted); }

.badge { display: inline-block; padding: 1px 8px; border-radius: 999px; font-size: 12px; font-weight: 500; background: var(--hover); color: var(--muted); }
.badge.ok { background: var(--ok-soft); color: var(--ok); }
.badge.danger { background: var(--danger-soft); color: var(--danger); }
.badge.warn { background: var(--warn-soft); color: var(--warn); }
.badge.primary { background: var(--primary-soft); color: var(--primary); }

/* ---------- Bộ lọc ---------- */
.toolbar { display: flex; flex-wrap: wrap; gap: 8px; padding: 12px; border-bottom: 1px solid var(--line); align-items: end; }
.toolbar .field { display: flex; flex-direction: column; gap: 4px; font-size: 12px; color: var(--muted); }
.toolbar .grow { flex: 1 1 220px; }
.toolbar .check-label { flex-direction: row; align-self: center; font-size: 13px; color: var(--text); }
.pager { display: flex; align-items: center; justify-content: space-between; gap: 8px; padding: 10px 12px; border-top: 1px solid var(--line); flex-wrap: wrap; }
.pager .btns { display: flex; gap: 6px; }
.bulkbar { display: flex; align-items: center; gap: 12px; padding: 8px 12px; background: var(--primary-soft); border-bottom: 1px solid var(--line); }

/* ---------- Form ---------- */
input, select, textarea {
  font: inherit; color: var(--text); background: var(--panel);
  border: 1px solid var(--line); border-radius: 8px; padding: 7px 10px; width: 100%;
}
input:focus, select:focus, textarea:focus { outline: 2px solid var(--primary-soft); border-color: var(--primary); }
input[type="checkbox"] { width: 16px; height: 16px; padding: 0; accent-color: var(--primary); }
textarea { resize: vertical; min-height: 120px; }
label { display: flex; flex-direction: column; gap: 6px; font-weight: 500; }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.form-grid .full { grid-column: 1 / -1; }
@media (max-width: 640px) { .form-grid { grid-template-columns: 1fr; } }
.check-label { flex-direction: row; align-items: center; gap: 8px; }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  font: inherit; font-weight: 500; padding: 7px 14px; border-radius: 8px; cursor: pointer;
  border: 1px solid var(--line); background: var(--panel); color: var(--text); white-space: nowrap;
}
.btn:hover { background: var(--hover); }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn.primary { background: var(--primary); border-color: var(--primary); color: var(--primary-ink); }
.btn.primary:hover { filter: brightness(1.08); }
.btn.danger { color: var(--danger); }
.btn.danger.solid { background: var(--danger); border-color: var(--danger); color: #fff; }
.btn.ghost { border-color: transparent; background: transparent; }
.btn.sm { padding: 4px 10px; font-size: 13px; }
.btn.block { width: 100%; }

/* ---------- Hộp thoại ---------- */
dialog {
  border: 1px solid var(--line); border-radius: 14px; padding: 0; width: min(760px, calc(100vw - 32px));
  background: var(--panel); color: var(--text); box-shadow: 0 20px 60px rgba(0, 0, 0, .25);
}
dialog::backdrop { background: rgba(15, 23, 42, .45); }
.modal-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 16px 20px; border-bottom: 1px solid var(--line); }
.modal-head h1 { font-size: 17px; }
.modal-body { padding: 18px 20px; max-height: calc(100vh - 200px); overflow: auto; }
.modal-foot { display: flex; justify-content: flex-end; gap: 8px; padding: 14px 20px; border-top: 1px solid var(--line); }
.modal-foot .left { margin-right: auto; }

.meta { display: grid; grid-template-columns: 120px 1fr; gap: 6px 12px; margin: 0 0 16px; }
.meta dt { color: var(--muted); }
.meta dd { margin: 0; word-break: break-word; }
.body-text { white-space: pre-wrap; word-break: break-word; background: var(--bg); border: 1px solid var(--line); border-radius: 8px; padding: 14px; margin: 0; font: inherit; }

/* ---------- Danh sách nộp ---------- */
.people { list-style: none; margin: 0; padding: 0; }
.people li { display: flex; align-items: center; justify-content: space-between; gap: 8px; padding: 8px 0; border-bottom: 1px solid var(--line); }
.people li:last-child { border-bottom: 0; }
.people .who { min-width: 0; }
.people .who div:last-child { color: var(--muted); font-size: 12px; overflow: hidden; text-overflow: ellipsis; }

/* Biểu đồ cột số báo cáo theo ngày */
.bars { display: flex; align-items: flex-end; gap: 6px; height: 140px; padding-top: 8px; }
.bars .bar { flex: 1; display: flex; flex-direction: column; align-items: center; justify-content: flex-end; height: 100%; gap: 4px; min-width: 0; }
.bars .fill { width: 100%; max-width: 34px; background: var(--primary); border-radius: 4px 4px 0 0; min-height: 2px; }
.bars .fill.zero { background: var(--line); }
.bars .n { font-size: 11px; color: var(--muted); }
.bars .d { font-size: 10px; color: var(--muted); white-space: nowrap; }

.copy-row { display: flex; gap: 8px; }
.copy-row input { font-family: ui-monospace, SFMono-Regular, Consolas, monospace; font-size: 13px; }

/* ---------- Đăng nhập ---------- */
.login { min-height: 100vh; display: grid; place-items: center; padding: 16px; }
.login-card { width: min(380px, 100%); background: var(--panel); border: 1px solid var(--line); border-radius: 14px; box-shadow: var(--shadow); padding: 28px; display: flex; flex-direction: column; gap: 14px; }
.login-card p { margin: 0; }

/* ---------- Thông báo ---------- */
.toasts { position: fixed; right: 16px; bottom: 16px; display: flex; flex-direction: column; gap: 8px; z-index: 100; }
.toast { background: var(--text); color: var(--bg); padding: 10px 14px; border-radius: 8px; box-shadow: var(--shadow); max-width: 360px; }
.toast.error { background: var(--danger); color: #fff; }

@media (max-width: 720px) {
  .topbar { padding: 0 12px; gap: 10px; }
  .topbar .brand { display: none; }
  .content { padding: 16px; }
  .meta { grid-template-columns: 1fr; }
  .meta dt { margin-top: 6px; }
  .cards { grid-template-columns: 1fr 1fr; gap: 10px; }
  .card .value { font-size: 22px; }
  .card .value.sm { font-size: 14px; }
  .bars { gap: 3px; }
  .bars .wd { display: none; }
  .topbar .btn { padding: 4px 6px; }
}

/* ---------- Chờ duyệt / phân loại ---------- */
.tabs .count { display: inline-block; min-width: 18px; padding: 0 6px; margin-left: 4px; border-radius: 999px; background: var(--danger); color: #fff; font-size: 11px; line-height: 18px; text-align: center; }
.summary { font-size: 13px; margin-top: 2px; }
.tags { display: flex; flex-wrap: wrap; gap: 4px; margin-top: 4px; }
.tag { font-size: 11px; padding: 0 6px; border-radius: 4px; background: var(--hover); color: var(--muted); }
.review-actions { display: flex; gap: 6px; align-items: center; justify-content: flex-end; flex-wrap: wrap; }
.review-actions select { width: auto; padding: 4px 6px; font-size: 13px; }
.cat-list { list-style: none; margin: 0; padding: 0; }
.cat-list li { display: flex; justify-content: space-between; gap: 8px; padding: 6px 0; border-bottom: 1px solid var(--line); }
.cat-list li:last-child { border-bottom: 0; }
.cat-list a { text-decoration: none; }
.mono { font-family: ui-monospace, SFMono-Regular, Consolas, monospace; font-size: 13px; }
.flow { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin: 0 0 16px; color: var(--muted); font-size: 13px; }
.flow .step { background: var(--panel); border: 1px solid var(--line); border-radius: 999px; padding: 3px 10px; color: var(--text); }

a.card-link { color: inherit; text-decoration: none; display: block; }
a.card-link:hover .card { border-color: var(--primary); }