:root {
  --brand: #f26b1d;
  --brand-dark: #d4560c;
  --brand-soft: #fff1e8;
  --ink: #1f2328;
  --muted: #6b7280;
  --line: #e5e7eb;
  --bg: #f6f7f9;
  --card: #ffffff;
  --ok: #15803d;
  --err: #b91c1c;
  --radius: 14px;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font-family: "Prompt", "Sarabun", system-ui, sans-serif; font-size: 16px; line-height: 1.55;
}
a { color: var(--brand-dark); }
img { max-width: 100%; }

.topbar { background: #16181d; color: #fff; }
.topbar .in { max-width: 1100px; margin: 0 auto; padding: 12px 16px; display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
.logo { font-weight: 700; font-size: 20px; letter-spacing: .3px; color: #fff; text-decoration: none; }
.logo b { color: var(--brand); }
.topbar nav { display: flex; gap: 14px; margin-left: auto; align-items: center; flex-wrap: wrap; }
.topbar nav a { color: #d1d5db; text-decoration: none; font-size: 15px; }
.topbar nav a:hover, .topbar nav a.on { color: #fff; }
.topbar form { margin: 0; }

.wrap { max-width: 1100px; margin: 0 auto; padding: 20px 16px 60px; }
.narrow { max-width: 760px; }
h1 { font-size: 24px; margin: 0 0 4px; }
h2 { font-size: 19px; margin: 0 0 12px; }
.sub { color: var(--muted); margin: 0 0 20px; }

.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; margin-bottom: 16px; }
.card h2 { display: flex; align-items: center; gap: 10px; }
.num { display: inline-grid; place-items: center; min-width: 28px; height: 28px; padding: 0 6px; border-radius: 999px; background: var(--brand); color: #fff; font-size: 14px; font-weight: 600; }

.grid { display: grid; gap: 14px 16px; grid-template-columns: 1fr 1fr; }
.grid .full { grid-column: 1 / -1; }
@media (max-width: 640px) { .grid { grid-template-columns: 1fr; } }

label.f { display: block; font-weight: 500; margin-bottom: 4px; }
label.f .req { color: var(--brand-dark); }
.hint { color: var(--muted); font-size: 13px; }
input[type=text], input[type=tel], input[type=email], input[type=number], input[type=password], input[type=search], select, textarea {
  width: 100%; padding: 11px 12px; border: 1px solid #d1d5db; border-radius: 10px; font: inherit; background: #fff; color: var(--ink);
}
input:focus, select:focus, textarea:focus { outline: 2px solid var(--brand); outline-offset: 0; border-color: var(--brand); }
textarea { min-height: 90px; resize: vertical; }
.err-msg { color: var(--err); font-size: 13px; margin-top: 4px; }
.has-err input, .has-err select, .has-err .drop { border-color: var(--err); }

.seg { display: flex; gap: 8px; flex-wrap: wrap; }
.seg label { position: relative; }
.seg input { position: absolute; opacity: 0; inset: 0; }
.seg span { display: inline-block; padding: 9px 18px; border: 1px solid #d1d5db; border-radius: 999px; cursor: pointer; background: #fff; user-select: none; }
.seg input:checked + span { background: var(--brand); border-color: var(--brand); color: #fff; }
.seg input:focus-visible + span { outline: 2px solid var(--brand-dark); outline-offset: 2px; }

.drop { position: relative; border: 2px dashed #d1d5db; border-radius: 12px; padding: 14px; text-align: center; background: #fafafa; cursor: pointer; min-height: 120px; display: grid; place-items: center; }
.drop:hover { border-color: var(--brand); background: var(--brand-soft); }
.drop input { position: absolute; inset: 0; opacity: 0; cursor: pointer; width: 100%; }
.drop .ph { color: var(--muted); font-size: 14px; }
.drop img.prev { max-height: 160px; border-radius: 8px; }
.drop.filled { border-style: solid; border-color: var(--brand); background: #fff; }

.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 11px 22px; border-radius: 10px; border: 1px solid transparent; font: inherit; font-weight: 600; cursor: pointer; text-decoration: none; }
.btn-primary { background: var(--brand); color: #fff; }
.btn-primary:hover { background: var(--brand-dark); }
.btn-ghost { background: #fff; border-color: #d1d5db; color: var(--ink); }
.btn-danger { background: #fff; border-color: #fecaca; color: var(--err); }
.btn-sm { padding: 6px 12px; font-size: 14px; font-weight: 500; }
.btn-link { background: none; border: 0; color: #d1d5db; cursor: pointer; font: inherit; font-size: 15px; padding: 0; }
.actions { display: flex; gap: 10px; justify-content: flex-end; flex-wrap: wrap; margin-top: 8px; }

.alert { padding: 12px 14px; border-radius: 10px; margin-bottom: 16px; }
.alert-err { background: #fef2f2; color: var(--err); border: 1px solid #fecaca; }
.alert-ok { background: #f0fdf4; color: var(--ok); border: 1px solid #bbf7d0; }
.alert-info { background: var(--brand-soft); color: #7c2d12; border: 1px solid #fed7aa; }

.hp { position: absolute; left: -10000px; width: 1px; height: 1px; overflow: hidden; }

/* staff */
.toolbar { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; margin-bottom: 14px; }
.toolbar input[type=search] { max-width: 320px; }
.toolbar select { width: auto; }
.chips { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 14px; }
.chip { padding: 5px 12px; border-radius: 999px; background: #fff; border: 1px solid var(--line); text-decoration: none; color: var(--ink); font-size: 14px; }
.chip.on { background: var(--ink); color: #fff; border-color: var(--ink); }
.tbl-wrap { overflow-x: auto; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); }
table { width: 100%; border-collapse: collapse; font-size: 15px; }
th, td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--line); vertical-align: top; white-space: nowrap; }
th { background: #fafafa; font-weight: 600; font-size: 14px; color: var(--muted); }
tr:last-child td { border-bottom: 0; }
td.wrap-ok { white-space: normal; min-width: 160px; }
tbody tr:hover { background: #fafafa; }
.badge { display: inline-block; padding: 2px 10px; border-radius: 999px; font-size: 13px; background: #f3f4f6; }
.badge.new { background: var(--brand-soft); color: #9a3412; }
.badge.won { background: #dcfce7; color: #166534; }
.badge.lost { background: #f3f4f6; color: #6b7280; }
.badge.proposed, .badge.designing, .badge.contacted { background: #e0f2fe; color: #075985; }
.pager { display: flex; gap: 8px; justify-content: center; margin-top: 14px; }

dl.kv { display: grid; grid-template-columns: 170px 1fr; gap: 8px 14px; margin: 0; }
dl.kv dt { color: var(--muted); }
dl.kv dd { margin: 0; word-break: break-word; }
@media (max-width: 640px) { dl.kv { grid-template-columns: 1fr; } dl.kv dt { margin-top: 6px; } }
.photos { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 12px; }
.photos figure { margin: 0; border: 1px solid var(--line); border-radius: 10px; overflow: hidden; background: #fafafa; }
.photos img { display: block; width: 100%; height: 150px; object-fit: cover; }
.photos figcaption { padding: 8px 10px; font-size: 13px; }
.photos .none { height: 150px; display: grid; place-items: center; color: var(--muted); font-size: 13px; }
.reco { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 12px; }
.reco .box { border: 1px solid var(--line); border-radius: 12px; padding: 14px; background: #fff; }
.reco .box h3 { margin: 0 0 8px; font-size: 17px; color: var(--brand-dark); }
.reco .big { font-size: 22px; font-weight: 700; }
.two-col { display: grid; grid-template-columns: 1.3fr 1fr; gap: 16px; }
@media (max-width: 860px) { .two-col { grid-template-columns: 1fr; } }
.login-box { max-width: 380px; margin: 60px auto; }
.footer-note { color: var(--muted); font-size: 13px; text-align: center; margin-top: 30px; }

/* Phase 3: ออกแบบระบบ */
.calc-out { font-size: 22px; font-weight: 700; color: var(--brand-dark); padding: 6px 0; }
.item-row { display: grid; grid-template-columns: 1fr 80px 130px auto; gap: 8px; margin-bottom: 8px; align-items: center; }
@media (max-width: 640px) { .item-row { grid-template-columns: 1fr 70px; } .item-row select[name=item_zone] { grid-column: 1; } }
.zone-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 4px; max-width: 420px; aspect-ratio: 3 / 2; background: #e5e7eb; padding: 4px; border-radius: 10px; }
.zone-grid > div { background: #fff; border-radius: 6px; padding: 6px; font-size: 12px; display: flex; flex-direction: column; gap: 2px; overflow: hidden; }
.zone-grid .zl { color: var(--muted); }
.zone-grid .zi { color: var(--ink); font-weight: 500; }
.zone-grid > div.used { background: var(--brand-soft); outline: 2px solid var(--brand); }
.sticky { position: sticky; top: 12px; }
@media (max-width: 860px) { .sticky { position: static; } }

/* Phase 5: Mock-up */
.mk-stage { position: relative; width: 100%; overflow: hidden; border-radius: 10px; background: #111; touch-action: none; user-select: none; }
.mk-stage > img { position: absolute; inset: 0; width: 100%; height: 100%; display: block; }
.mk-item { position: absolute; cursor: grab; outline: 1px dashed rgba(255,255,255,.7); }
.mk-item img { width: 100%; height: 100%; object-fit: contain; display: block; pointer-events: none; filter: drop-shadow(2px 3px 3px rgba(0,0,0,.45)); }
.mk-item.box { background: #f4f5f7; border: 1px solid #969ca6; border-radius: 4px; color: #374151; font-size: 11px; display: flex; align-items: center; justify-content: center; text-align: center; padding: 2px; line-height: 1.2; }
.mk-item.sel { outline: 2px solid var(--brand); }
.mk-item:active { cursor: grabbing; }
.mk-row { display: grid; grid-template-columns: 1fr auto auto; gap: 8px; align-items: center; padding: 6px 8px; border-radius: 8px; cursor: pointer; }
.mk-row:hover, .mk-row.sel { background: var(--brand-soft); }
.mk-choose { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.mk-choose label { border: 2px solid var(--line); border-radius: 10px; padding: 6px; cursor: pointer; display: flex; flex-direction: column; gap: 4px; font-size: 13px; }
.mk-choose label.on { border-color: var(--brand); background: var(--brand-soft); }
.mk-choose input { position: absolute; opacity: 0; }
.mk-choose img { width: 100%; border-radius: 6px; display: block; }
.roof-wrap { position: relative; width: 100%; }
.roof-wrap canvas { width: 100%; height: auto; display: block; border-radius: 10px; touch-action: none; cursor: crosshair; background: #111; }
.arr-row { border: 1px solid var(--line); border-radius: 10px; padding: 10px; margin-bottom: 8px; }
.arr-row.sel { border-color: var(--brand); background: var(--brand-soft); }
.arr-row .grid { grid-template-columns: 1fr 1fr auto; align-items: end; }
.mk-thumbs { display: grid; grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: 10px; }
.mk-thumbs a { display: block; border: 1px solid var(--line); border-radius: 10px; overflow: hidden; text-decoration: none; color: var(--ink); background: #fafafa; }
.mk-thumbs img, .mk-thumbs .none { width: 100%; height: 110px; object-fit: cover; display: grid; place-items: center; color: var(--muted); font-size: 13px; }
.mk-thumbs span { display: block; padding: 6px 8px; font-size: 13px; }
.mk-item .mk-n { position: absolute; top: -9px; left: -9px; width: 20px; height: 20px; border-radius: 50%; background: var(--brand); color: #fff; font-size: 12px; font-weight: 600; display: grid; place-items: center; border: 2px solid #fff; pointer-events: none; }
.mk-floor { position: absolute; left: 0; right: 0; height: 14px; margin-top: -7px; cursor: ns-resize; z-index: 3; }
.mk-floor::before { content: ""; position: absolute; left: 0; right: 0; top: 6px; border-top: 2px dashed var(--brand); }
.mk-floor span { position: absolute; left: 6px; top: -18px; background: rgba(17,24,39,.8); color: #fff; font-size: 11px; padding: 1px 6px; border-radius: 4px; white-space: nowrap; }