:root {
  --bg:#f4f6f8; --card:#fff; --ink:#1a2332; --muted:#6b7686; --line:#e3e8ef;
  --accent:#0f766e; --accent2:#14b8a6; --warn:#b45309; --danger:#b91c1c; --ok:#15803d;
}
* { box-sizing:border-box; margin:0; padding:0; }
body { font-family:-apple-system,'Segoe UI',Roboto,Helvetica,Arial,sans-serif; background:var(--bg); color:var(--ink); }
.hidden { display:none !important; }
.card { background:var(--card); border:1px solid var(--line); border-radius:14px; }

/* login */
#login { min-height:100vh; display:flex; align-items:center; justify-content:center; padding:20px; }
.login-card { width:340px; padding:28px; display:flex; flex-direction:column; gap:12px; box-shadow:0 10px 30px rgba(20,30,50,.08); }
.login-card h1 { font-size:20px; }
.sub { color:var(--muted); font-size:13px; }
input { padding:12px 14px; border:1px solid var(--line); border-radius:9px; font-size:15px; }
input:focus { outline:2px solid var(--accent2); border-color:transparent; }
button { padding:12px 16px; border:none; border-radius:9px; background:var(--accent); color:#fff; font-size:15px; font-weight:600; cursor:pointer; }
button.ghost { background:transparent; color:var(--ink); border:1px solid var(--line); }
.err { color:var(--danger); font-size:13px; min-height:16px; }

/* header */
header { display:flex; justify-content:space-between; align-items:center; padding:14px 22px; background:var(--card); border-bottom:1px solid var(--line); position:sticky; top:0; z-index:5; }
.brand { display:flex; align-items:center; gap:12px; }
.who { color:var(--accent); background:#e6f7f5; padding:2px 10px; border-radius:20px; font-size:13px; }
.actions { display:flex; align-items:center; gap:14px; }
#greet { color:var(--muted); font-size:14px; }

.layout { display:flex; gap:20px; padding:20px; max-width:1200px; margin:0 auto; align-items:flex-start; }
#board { flex:0 0 340px; display:flex; flex-direction:column; gap:10px; }
#detail { flex:1; }

.task { background:var(--card); border:1px solid var(--line); border-radius:12px; padding:14px 16px; cursor:pointer; transition:border .12s; }
.task:hover { border-color:var(--accent2); }
.task.active { border-color:var(--accent); box-shadow:0 0 0 1px var(--accent); }
.task h3 { font-size:15px; margin-bottom:6px; }
.task .meta { display:flex; gap:8px; align-items:center; flex-wrap:wrap; font-size:12px; color:var(--muted); }
.pill { padding:2px 9px; border-radius:20px; font-size:11px; font-weight:600; }
.pill.pending{background:#eef2f7;color:#475569}
.pill.submitted{background:#fff7ed;color:#c2410c}
.pill.in_progress{background:#eff6ff;color:#1d4ed8}
.pill.needs_info{background:#fef2f2;color:#b91c1c}
.pill.done{background:#f0fdf4;color:#15803d}
.pill.type{background:#f5f3ff;color:#6d28d9}

.empty { color:var(--muted); padding:40px; text-align:center; }
.detail { padding:22px; }
.detail h2 { font-size:20px; margin-bottom:4px; }
.due { color:var(--muted); font-size:13px; margin-bottom:14px; }
.steps { background:#f8fafc; border:1px solid var(--line); border-left:4px solid var(--accent); border-radius:10px; padding:14px; margin:14px 0; white-space:pre-wrap; font-size:14px; line-height:1.6; }
.steps b.title{color:var(--accent)}
h4.sec { margin:20px 0 8px; font-size:13px; text-transform:uppercase; letter-spacing:.5px; color:var(--muted); }
.submit-box { display:flex; flex-direction:column; gap:10px; }
textarea { width:100%; min-height:70px; padding:11px; border:1px solid var(--line); border-radius:9px; font-family:inherit; font-size:14px; }
.file-row { display:flex; gap:10px; align-items:center; font-size:14px; }
.file-row input[type=file]{ font-size:14px; }
.attached { color:var(--ok); font-size:13px; }
.thread { display:flex; flex-direction:column; gap:8px; }
.msg { padding:9px 12px; border-radius:10px; font-size:14px; max-width:85%; }
.msg.staff { background:#eef2f7; align-self:flex-start; }
.msg.abu { background:var(--accent); color:#fff; align-self:flex-end; }
.msg .who{font-size:11px;opacity:.75;display:block;margin-bottom:2px;font-weight:600}
.sub-history { display:flex; flex-direction:column; gap:8px; }
.sh-item { border:1px solid var(--line); border-radius:10px; padding:10px 12px; font-size:13px; background:#fff; }
.sh-item .fname{color:var(--accent);font-weight:600}
.sh-item time{color:var(--muted);font-size:11px}
.btnrow{display:flex;gap:10px;flex-wrap:wrap}