:root {
  --bg: #f6f7fb; --card: #ffffff; --ink: #1d2433; --muted: #667085; --line: #e3e6ee;
  --accent: #4f6bed; --accent-soft: #eef1ff; --ok: #12a150; --warn: #d97706; --bad: #dc2626;
  --shadow: 0 1px 2px rgba(16,24,40,.06), 0 1px 3px rgba(16,24,40,.08);
  --radius: 12px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12151c; --card: #1b1f29; --ink: #e7e9ee; --muted: #9aa3b5; --line: #2b3140;
    --accent: #7d93ff; --accent-soft: #232a45; --shadow: none; color-scheme: dark;
  }
}
* { box-sizing: border-box; }
html, body { margin: 0; background: var(--bg); color: var(--ink); font: 15px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.hidden { display: none !important; }
.muted { color: var(--muted); }
.small { font-size: 13px; }
.err { color: var(--bad); min-height: 1.2em; }
h1 { font-size: 24px; margin: 0 0 4px; }
h2 { font-size: 18px; margin: 24px 0 10px; }
h3 { font-size: 15px; margin: 0 0 6px; }

/* nút & form */
.btn { display: inline-flex; align-items: center; gap: 6px; border: 1px solid var(--line); background: var(--card); color: var(--ink);
  padding: 8px 14px; border-radius: 9px; font: inherit; cursor: pointer; white-space: nowrap; }
.btn:hover { border-color: var(--accent); text-decoration: none; }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn.primary:hover { filter: brightness(1.08); }
.btn.ghost { background: transparent; border-color: transparent; }
.btn.danger { color: var(--bad); }
.btn.sm { padding: 5px 10px; font-size: 13px; }
.btn:disabled { opacity: .55; cursor: wait; }
input, select, textarea { font: inherit; color: var(--ink); background: var(--card); border: 1px solid var(--line); border-radius: 8px; padding: 7px 10px; width: 100%; }
input:focus, select:focus, textarea:focus { outline: 2px solid var(--accent-soft); border-color: var(--accent); }
textarea { resize: vertical; }
label.f { display: block; font-size: 13px; color: var(--muted); margin-bottom: 10px; }
label.f > input, label.f > select, label.f > textarea { margin-top: 3px; }
.check { display: inline-flex; align-items: center; gap: 6px; cursor: pointer; }
.check input { width: auto; }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 0 14px; }
.grid3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0 14px; }
.row { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.spacer { flex: 1; }

/* đăng nhập */
.login { min-height: 100vh; display: grid; place-items: center; padding: 16px; }
.login-card { background: var(--card); padding: 32px; border-radius: 16px; box-shadow: var(--shadow); width: min(360px, 100%); display: grid; gap: 12px; text-align: center; border: 1px solid var(--line); }
.brand-big { font-size: 26px; font-weight: 700; }

/* thanh trên */
.topbar { position: sticky; top: 0; z-index: 10; display: flex; align-items: center; gap: 18px; padding: 10px 20px; background: var(--card); border-bottom: 1px solid var(--line); flex-wrap: wrap; }
.brand { font-weight: 700; color: var(--ink); font-size: 17px; }
.brand:hover { text-decoration: none; }
nav { display: flex; gap: 4px; flex-wrap: wrap; }
nav a { padding: 6px 12px; border-radius: 8px; color: var(--muted); }
nav a:hover { background: var(--bg); text-decoration: none; }
nav a.on { background: var(--accent-soft); color: var(--accent); font-weight: 600; }
.top-actions { margin-left: auto; display: flex; gap: 6px; align-items: center; }
.menu { position: relative; }
.menu summary { list-style: none; }
.menu summary::-webkit-details-marker { display: none; }
.menu-pop { position: absolute; right: 0; top: 110%; background: var(--card); border: 1px solid var(--line); border-radius: 10px; box-shadow: var(--shadow); padding: 6px; min-width: 170px; display: grid; }
.menu-pop a, .menu-pop button { padding: 8px 10px; border-radius: 6px; text-align: left; border: 0; background: none; color: var(--ink); font: inherit; cursor: pointer; }
.menu-pop a:hover, .menu-pop button:hover { background: var(--bg); text-decoration: none; }

main { max-width: 1180px; margin: 0 auto; padding: 22px 20px 80px; }

/* thẻ */
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px; box-shadow: var(--shadow); }
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(170px, 1fr)); gap: 10px; }
.stat { display: flex; flex-direction: column; gap: 2px; cursor: pointer; }
.stat:hover { border-color: var(--accent); }
.stat b { font-size: 24px; }
.cols { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.list { display: grid; gap: 8px; }

/* chip / nhãn */
.chip { display: inline-flex; align-items: center; gap: 4px; padding: 2px 9px; border-radius: 999px; background: var(--bg); border: 1px solid var(--line); font-size: 12px; color: var(--muted); white-space: nowrap; }
.chip.cat { background: var(--accent-soft); color: var(--accent); border-color: transparent; }
.chip.warn { color: var(--warn); border-color: currentColor; background: transparent; }
.chip.bad { color: var(--bad); border-color: currentColor; background: transparent; }
.chip.ok { color: var(--ok); border-color: currentColor; background: transparent; }
.chips { display: flex; gap: 6px; flex-wrap: wrap; }
.filter-chip { cursor: pointer; }
.filter-chip.on { background: var(--accent); color: #fff; border-color: var(--accent); }
.dot { width: 10px; height: 10px; border-radius: 50%; display: inline-block; flex: none; }

/* item */
.item { display: grid; grid-template-columns: 34px 1fr auto; gap: 10px; align-items: start; padding: 12px 14px; }
.item .ico { font-size: 22px; line-height: 1; padding-top: 2px; }
.item .t { font-weight: 600; word-break: break-word; }
.item .u { font-size: 12px; color: var(--muted); word-break: break-all; }
.item .meta { display: flex; gap: 6px 12px; flex-wrap: wrap; font-size: 13px; color: var(--muted); margin-top: 4px; }
.item .meta b { color: var(--ink); font-weight: 500; }
.item .acts { display: flex; gap: 2px; }
.group-h { display: flex; align-items: center; gap: 8px; margin: 22px 0 8px; font-weight: 700; }

/* review sau khi dán */
.review { display: grid; gap: 10px; }
.rv { display: grid; grid-template-columns: 26px 1fr; gap: 10px; padding: 12px 14px; }
.rv.off { opacity: .45; }
.rv .fields { display: grid; grid-template-columns: 2fr 1.3fr 1.3fr; gap: 8px; }
.rv .fields2 { display: grid; grid-template-columns: 1fr 1fr 150px 1fr; gap: 8px; margin-top: 8px; }
.rv input, .rv select { padding: 5px 8px; font-size: 14px; }
.rv .src { font-size: 12px; color: var(--muted); margin-top: 6px; word-break: break-all; }
.sticky-bar { position: sticky; bottom: 0; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 10px 14px; margin-top: 14px; box-shadow: 0 -4px 14px rgba(0,0,0,.06); }

/* dự án */
.proj-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 14px; }
.proj { cursor: pointer; border-top: 4px solid var(--c, var(--accent)); display: grid; gap: 8px; }
.proj:hover { box-shadow: 0 4px 14px rgba(16,24,40,.12); }
.bar { height: 7px; background: var(--bg); border-radius: 99px; overflow: hidden; }
.bar > i { display: block; height: 100%; background: var(--c, var(--accent)); }

/* timeline */
.tl { display: grid; gap: 4px; }
.tl-row { display: grid; grid-template-columns: 26px minmax(180px, 2fr) 3fr; gap: 10px; align-items: center; padding: 6px 4px; border-bottom: 1px dashed var(--line); }
.tl-row.done .tl-title { text-decoration: line-through; color: var(--muted); }
.tl-row.late .tl-dates { color: var(--bad); font-weight: 600; }
.tl-title { font-weight: 600; }
.tl-detail { font-size: 12.5px; color: var(--muted); }
.tl-dates { font-size: 12px; color: var(--muted); }
.tl-track { position: relative; height: 22px; background: var(--bg); border-radius: 6px; }
.tl-seg { position: absolute; top: 3px; bottom: 3px; background: var(--c, var(--accent)); border-radius: 5px; opacity: .85; min-width: 4px; }
.tl-row.done .tl-seg { opacity: .3; }
.tl-today { position: absolute; top: -4px; bottom: -4px; width: 2px; background: var(--bad); }
.tl-edit { display: grid; grid-template-columns: 1fr 140px 140px 32px; gap: 6px; align-items: start; margin-bottom: 6px; }
.tl-edit textarea { grid-column: 1 / -1; font-size: 13px; }
.advice { background: var(--accent-soft); border-radius: 10px; padding: 10px 14px; margin: 10px 0; }

/* modal & toast */
dialog { border: 0; border-radius: 16px; padding: 0; width: min(640px, calc(100vw - 32px)); background: var(--card); color: var(--ink); box-shadow: 0 20px 60px rgba(0,0,0,.3); }
dialog::backdrop { background: rgba(10,14,25,.45); }
#modalBody { padding: 22px; max-height: 85vh; overflow: auto; }
.toast { position: fixed; left: 50%; bottom: 22px; transform: translateX(-50%) translateY(30px); background: #1d2433; color: #fff; padding: 10px 18px; border-radius: 10px; opacity: 0; transition: .25s; pointer-events: none; z-index: 100; max-width: calc(100vw - 32px); }
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
.toast.bad { background: var(--bad); }
.empty { text-align: center; padding: 40px 16px; color: var(--muted); }
.spin { display: inline-block; width: 14px; height: 14px; border: 2px solid currentColor; border-right-color: transparent; border-radius: 50%; animation: sp .7s linear infinite; }
@keyframes sp { to { transform: rotate(360deg); } }

@media (max-width: 760px) {
  .topbar { padding: 10px 16px; gap: 8px; }
  main { padding: 16px 16px 80px; }
  .cols, .grid2, .grid3 { grid-template-columns: 1fr; }
  .rv .fields, .rv .fields2 { grid-template-columns: 1fr; }
  .tl-row { grid-template-columns: 26px 1fr; }
  .tl-track { grid-column: 2; }
  .tl-edit { grid-template-columns: 1fr 1fr 32px; }
  .tl-edit > input:first-child { grid-column: 1 / -1; }
}