:root {
  --bg: #f6f6f3;
  --surface: #ffffff;
  --surface-2: #f0efea;
  --ink: #1b1c1e;
  --ink-2: #55575c;
  --ink-3: #8a8c91;
  --line: #e3e2dc;
  --accent: #c2410c;
  --accent-soft: #fdeee6;
  --ok: #15803d;
  --ok-soft: #e7f5ec;
  --warn: #b45309;
  --warn-soft: #fdf3e2;
  --err: #b91c1c;
  --err-soft: #fdeaea;
  --info: #1d4ed8;
  --info-soft: #e8eefc;
  --radius: 12px;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.04), 0 4px 16px rgba(0, 0, 0, 0.04);
  --font: "IBM Plex Sans Thai", system-ui, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, monospace;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #131416; --surface: #1b1c1f; --surface-2: #232428; --ink: #ececea; --ink-2: #b4b5b8; --ink-3: #7f8186;
    --line: #2e3034; --accent: #f97316; --accent-soft: #3a2316; --ok: #4ade80; --ok-soft: #16301f; --warn: #fbbf24;
    --warn-soft: #362a12; --err: #f87171; --err-soft: #3a1a1a; --info: #93b4ff; --info-soft: #1b2440; color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #131416; --surface: #1b1c1f; --surface-2: #232428; --ink: #ececea; --ink-2: #b4b5b8; --ink-3: #7f8186;
  --line: #2e3034; --accent: #f97316; --accent-soft: #3a2316; --ok: #4ade80; --ok-soft: #16301f; --warn: #fbbf24;
  --warn-soft: #362a12; --err: #f87171; --err-soft: #3a1a1a; --info: #93b4ff; --info-soft: #1b2440; color-scheme: dark;
}

* { box-sizing: border-box; }
html, body { margin: 0; }
body { background: var(--bg); color: var(--ink); font: 15px/1.6 var(--font); -webkit-font-smoothing: antialiased; }
a { color: inherit; }
button, input, select, textarea { font: inherit; color: inherit; }
h1, h2, h3 { line-height: 1.3; margin: 0; }
h1 { font-size: 24px; font-weight: 700; }
h2 { font-size: 18px; font-weight: 600; }
h3 { font-size: 15px; font-weight: 600; }
.muted { color: var(--ink-3); }
.small { font-size: 13px; }
.mono { font-family: var(--mono); font-size: 13px; }

/* top bar */
.topbar { position: sticky; top: 0; z-index: 10; display: flex; align-items: center; gap: 16px; padding: 12px 24px;
  background: color-mix(in srgb, var(--bg) 85%, transparent); backdrop-filter: blur(8px); border-bottom: 1px solid var(--line); }
.brand { font-weight: 700; text-decoration: none; white-space: nowrap; }
.logo { color: var(--accent); }
.crumbs { display: flex; gap: 6px; align-items: center; flex: 1; min-width: 0; overflow: hidden; color: var(--ink-3); font-size: 14px; }
.crumbs a { text-decoration: none; color: var(--ink-2); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.crumbs a:hover { color: var(--ink); }
.app { max-width: 1240px; margin: 0 auto; padding: 24px; }
.loading { padding: 48px; text-align: center; color: var(--ink-3); }

/* layout */
.row { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; }
.between { justify-content: space-between; }
.stack > * + * { margin-top: 12px; }
.grid { display: grid; gap: 16px; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); }
.two { display: grid; gap: 20px; grid-template-columns: minmax(0, 340px) minmax(0, 1fr); }
@media (max-width: 860px) { .two { grid-template-columns: 1fr; } .app { padding: 16px; } .topbar { padding: 10px 16px; } }
.page-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 16px; flex-wrap: wrap; margin-bottom: 20px; }
.page-head p { margin: 4px 0 0; color: var(--ink-2); }

.card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px; box-shadow: var(--shadow); }
.card.link { text-decoration: none; display: block; transition: border-color .15s, transform .15s; }
.card.link:hover { border-color: var(--accent); transform: translateY(-1px); }
.card.dashed { border-style: dashed; box-shadow: none; background: transparent; display: grid; place-items: center; min-height: 140px; color: var(--ink-2); cursor: pointer; }
.card h3 + p { margin: 4px 0 0; }
.section-title { margin: 28px 0 12px; display: flex; align-items: center; gap: 8px; }

/* buttons & inputs */
button, .btn { border: 1px solid var(--line); background: var(--surface); padding: 8px 14px; border-radius: 9px; cursor: pointer; text-decoration: none; display: inline-flex; gap: 6px; align-items: center; font-size: 14px; }
button:hover, .btn:hover { border-color: var(--ink-3); }
button.primary, .btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; font-weight: 600; }
button.primary:hover { filter: brightness(1.05); }
button.ghost { background: transparent; border-color: transparent; }
button.icon { padding: 6px 10px; }
button:disabled { opacity: .45; cursor: not-allowed; }
input, select, textarea { border: 1px solid var(--line); background: var(--surface); border-radius: 9px; padding: 8px 10px; width: 100%; }
input:focus, select:focus, textarea:focus { outline: 2px solid color-mix(in srgb, var(--accent) 40%, transparent); border-color: var(--accent); }
label { display: block; font-size: 13px; color: var(--ink-2); }
label > input, label > select, label > textarea { margin-top: 4px; }
.form-grid { display: grid; gap: 12px; grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); }
textarea.code { font-family: var(--mono); font-size: 13px; line-height: 1.55; min-height: 460px; resize: vertical; tab-size: 2; }

/* tabs */
.tabs { display: flex; gap: 4px; border-bottom: 1px solid var(--line); margin-bottom: 20px; overflow-x: auto; }
.tabs button { border: 0; background: none; border-bottom: 2px solid transparent; border-radius: 0; padding: 10px 14px; color: var(--ink-2); white-space: nowrap; }
.tabs button.on { color: var(--ink); border-bottom-color: var(--accent); font-weight: 600; }
.tabs .count { background: var(--surface-2); border-radius: 20px; padding: 0 7px; font-size: 12px; margin-left: 4px; }

/* pills & badges */
.pill { display: inline-flex; align-items: center; gap: 4px; padding: 2px 9px; border-radius: 99px; font-size: 12px; font-weight: 500; background: var(--surface-2); color: var(--ink-2); white-space: nowrap; }
.pill.ok { background: var(--ok-soft); color: var(--ok); }
.pill.warn { background: var(--warn-soft); color: var(--warn); }
.pill.err { background: var(--err-soft); color: var(--err); }
.pill.info { background: var(--info-soft); color: var(--info); }
.pill.accent { background: var(--accent-soft); color: var(--accent); }
.aw { font-family: var(--mono); font-size: 12px; padding: 1px 7px; border-radius: 6px; background: var(--surface-2); }
.aw.L1 { background: #e8eefc; color: #1d4ed8; } .aw.L2 { background: #e6f4f1; color: #0f766e; } .aw.L3 { background: #eef5e4; color: #4d7c0f; }
.aw.L4 { background: #fdf3e2; color: #b45309; } .aw.L5 { background: #fdeaea; color: #b91c1c; }
:root[data-theme="dark"] .aw { filter: brightness(.85) saturate(1.2); }

/* kpis */
.kpis { display: grid; gap: 12px; grid-template-columns: repeat(auto-fill, minmax(170px, 1fr)); margin-bottom: 20px; }
.kpi { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 16px; }
.kpi .label { font-size: 12px; color: var(--ink-3); text-transform: uppercase; letter-spacing: .03em; }
.kpi .value { font-size: 24px; font-weight: 700; margin-top: 2px; }
.kpi .bar { height: 4px; background: var(--surface-2); border-radius: 4px; margin-top: 8px; overflow: hidden; }
.kpi .bar > i { display: block; height: 100%; background: var(--accent); }

/* plan board */
.board { display: grid; grid-auto-flow: column; grid-auto-columns: minmax(250px, 1fr); gap: 14px; overflow-x: auto; padding-bottom: 8px; }
.col { background: var(--surface-2); border-radius: var(--radius); padding: 10px; min-height: 120px; }
.col-head { display: flex; justify-content: space-between; align-items: baseline; padding: 4px 6px 10px; }
.col-head h3 { font-size: 14px; }
.piece { display: block; text-decoration: none; background: var(--surface); border: 1px solid var(--line); border-radius: 10px; padding: 10px 12px; margin-bottom: 8px; }
.piece:hover { border-color: var(--accent); }
.piece .top { display: flex; justify-content: space-between; gap: 6px; align-items: center; font-size: 12px; color: var(--ink-3); }
.piece .angle { font-size: 14px; margin: 6px 0; line-height: 1.45; }
.piece .meta { display: flex; gap: 4px; flex-wrap: wrap; }
.piece.optional { opacity: .78; border-style: dashed; }

/* table */
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th, td { text-align: left; padding: 9px 10px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { font-size: 12px; color: var(--ink-3); font-weight: 500; text-transform: uppercase; letter-spacing: .03em; }
tr:hover td { background: color-mix(in srgb, var(--surface-2) 60%, transparent); }
.table-wrap { overflow-x: auto; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); }

/* issues / tasks */
.issues { list-style: none; padding: 0; margin: 0; }
.issues li { display: flex; gap: 10px; padding: 9px 12px; border-bottom: 1px solid var(--line); font-size: 14px; align-items: flex-start; }
.issues li:last-child { border-bottom: 0; }
.issues .where { color: var(--ink-3); font-size: 12px; font-family: var(--mono); }
.dot { width: 8px; height: 8px; border-radius: 50%; margin-top: 8px; flex: none; }
.dot.error { background: var(--err); } .dot.warn { background: var(--warn); } .dot.ok { background: var(--ok); }
.empty { padding: 28px; text-align: center; color: var(--ink-3); }

/* stepper */
.stepper { display: flex; gap: 4px; margin: 6px 0 14px; }
.stepper span { flex: 1; height: 6px; border-radius: 4px; background: var(--surface-2); }
.stepper span.done { background: var(--accent); }
.spec dt { font-size: 12px; color: var(--ink-3); margin-top: 12px; }
.spec dd { margin: 2px 0 0; }
.chips { display: flex; gap: 4px; flex-wrap: wrap; }

/* content preview */
.preview { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px 24px; }
.preview h1, .preview h2, .preview h3 { margin: 18px 0 8px; }
.preview p { margin: 0 0 10px; }
.preview table { margin: 10px 0; font-size: 13px; }
.preview blockquote { border-left: 3px solid var(--accent); margin: 10px 0; padding: 4px 14px; color: var(--ink-2); }
.preview code { font-family: var(--mono); background: var(--surface-2); padding: 1px 5px; border-radius: 5px; font-size: 13px; }
.fmt-tabs { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 12px; }
.fmt-tabs button.on { background: var(--ink); color: var(--bg); border-color: var(--ink); }
.prompt { font-family: var(--mono); font-size: 13px; background: var(--surface-2); border-radius: 9px; padding: 10px 12px; white-space: pre-wrap; word-break: break-word; }

.toast { position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%); background: var(--ink); color: var(--bg); padding: 10px 18px; border-radius: 10px; font-size: 14px; z-index: 50; max-width: min(640px, 90vw); white-space: pre-wrap; box-shadow: var(--shadow); }
.toast.err { background: var(--err); color: #fff; }
dialog { border: 1px solid var(--line); border-radius: 14px; padding: 0; background: var(--surface); color: var(--ink); width: min(460px, 92vw); }
dialog::backdrop { background: rgba(0, 0, 0, .35); }
dialog form { padding: 22px; }
dialog form > * + * { margin-top: 14px; }
.files { list-style: none; margin: 0; padding: 0; }
.files li button { width: 100%; justify-content: flex-start; border: 0; background: none; border-radius: 8px; font-family: var(--mono); font-size: 13px; padding: 7px 10px; }
.files li button.on { background: var(--accent-soft); color: var(--accent); }

/* ---------- calendar ---------- */
.cal-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; margin-bottom: 12px; }
.cal-head h2 { min-width: 180px; }
.cal-filters { display: flex; gap: 6px; flex-wrap: wrap; }
.cal-filters button.on { background: var(--ink); color: var(--bg); border-color: var(--ink); }
.cal { display: grid; grid-template-columns: repeat(7, minmax(0, 1fr)); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; background: var(--line); gap: 1px; }
.cal .dow { background: var(--surface-2); font-size: 12px; color: var(--ink-3); padding: 6px 8px; text-align: center; }
.cal .day { background: var(--surface); min-height: 118px; padding: 6px; display: flex; flex-direction: column; gap: 3px; min-width: 0; }
.cal .day.out { background: color-mix(in srgb, var(--surface) 55%, var(--bg)); }
.cal .day.out .num { color: var(--ink-3); opacity: .6; }
.cal .day.today .num { background: var(--accent); color: #fff; border-radius: 99px; padding: 0 7px; }
.cal .day.drop { outline: 2px dashed var(--accent); outline-offset: -3px; background: var(--accent-soft); }
.cal .num { font-size: 12px; font-weight: 600; align-self: flex-start; }
.cal .phase-band { height: 4px; border-radius: 3px; margin: 1px 0; }
.ev { font-size: 12px; line-height: 1.35; padding: 3px 6px; border-radius: 6px; background: var(--surface-2); border-left: 3px solid var(--ink-3); cursor: pointer; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; text-decoration: none; display: block; }
.ev[draggable="true"] { cursor: grab; }
.ev.piece.planned { border-left-color: var(--ink-3); }
.ev.piece.drafted { border-left-color: var(--info); }
.ev.piece.qc_passed { border-left-color: var(--accent); }
.ev.piece.approved, .ev.piece.published, .ev.piece.measured { border-left-color: var(--ok); }
.ev.task { border-left-color: var(--warn); background: var(--warn-soft); }
.ev.task.overdue { border-left-color: var(--err); background: var(--err-soft); }
.ev.key_date { border-left-color: var(--accent); background: var(--accent-soft); font-weight: 600; }
.ev .t { color: var(--ink-3); margin-right: 3px; }
.more { font-size: 11px; color: var(--ink-3); padding-left: 4px; }
.agenda { margin-top: 16px; }
.agenda .day-title { font-weight: 600; margin: 14px 0 6px; font-size: 14px; }
.agenda .ev { white-space: normal; padding: 6px 10px; font-size: 13px; margin-bottom: 4px; }
.legend { display: flex; gap: 12px; flex-wrap: wrap; font-size: 12px; color: var(--ink-3); margin-top: 10px; }
.legend i { display: inline-block; width: 10px; height: 10px; border-radius: 3px; margin-right: 4px; vertical-align: -1px; }
@media (max-width: 760px) { .cal { display: none; } }
@media (min-width: 761px) { .agenda.mobile-only { display: none; } }

/* ---------- kanban ---------- */
.kanban { display: grid; grid-template-columns: repeat(3, minmax(260px, 1fr)); gap: 14px; overflow-x: auto; }
.kanban .col.drop, .board .col.drop { outline: 2px dashed var(--accent); outline-offset: -2px; background: var(--accent-soft); }
.task-card { background: var(--surface); border: 1px solid var(--line); border-radius: 10px; padding: 10px 12px; margin-bottom: 8px; cursor: grab; }
.task-card.overdue { border-left: 3px solid var(--err); }
.task-card.done .title { text-decoration: line-through; color: var(--ink-3); }
.task-card .title { font-size: 14px; line-height: 1.45; }
.task-card .meta { display: flex; gap: 4px; flex-wrap: wrap; margin-top: 6px; align-items: center; }
.task-card .actions { display: flex; gap: 6px; margin-top: 8px; }
.task-card .actions select { width: auto; padding: 3px 6px; font-size: 12px; }
.task-card .actions button { padding: 3px 8px; font-size: 12px; }
.add-task { display: grid; gap: 8px; grid-template-columns: 2fr 1fr 1fr 1fr auto; margin-bottom: 16px; }
@media (max-width: 860px) { .add-task { grid-template-columns: 1fr 1fr; } .kanban { grid-template-columns: repeat(3, minmax(240px, 85vw)); } }
.dragging { opacity: .45; }