/* Xưởng cắt: bảng thép anod, mực đỏ ghi kích thước, kính xanh lơ.
   Bố cục: thanh đầu cố định + 3 bước; trang thiết kế chia 3 cột (hạng mục | thông số | bản vẽ). */
[hidden] { display: none !important }
:root {
  --bg: #eef1f2; --surface: #ffffff; --surface-2: #f5f7f7; --line: #d5dbdd; --line-2: #e4e8e9;
  --fg: #1d2427; --muted: #5f6b70; --accent: #c4501f; --accent-fg: #fff; --accent-soft: #fbe9df;
  --ink: #b3261e; --metal: #c3c9cd; --metal-edge: #59646a; --glass: #cfe8ee; --glass-edge: #7fb3c0; --panel-fill: #d9d4cb;
  --ok: #2f7d4f; --warn: #a86a00; --warn-soft: #fff4dc; --view-bg: #e7ecee;
  --f-display: "Barlow Condensed", "Arial Narrow", sans-serif; --f-body: "Be Vietnam Pro", system-ui, sans-serif; --f-mono: "JetBrains Mono", ui-monospace, monospace;
  --r: 6px;
}
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) {
  --bg: #15191b; --surface: #1d2326; --surface-2: #232a2d; --line: #354045; --line-2: #2b3438;
  --fg: #e5eaec; --muted: #9aa7ac; --accent: #ec7a45; --accent-fg: #1a0d06; --accent-soft: #3a2418;
  --ink: #ff7d6e; --metal: #8f9aa0; --metal-edge: #cfd6d9; --glass: #23434c; --glass-edge: #5c96a5; --panel-fill: #4a463f;
  --ok: #6fc18f; --warn: #f0b545; --warn-soft: #3a2f16; --view-bg: #20282b; color-scheme: dark } }
:root[data-theme="dark"] {
  --bg: #15191b; --surface: #1d2326; --surface-2: #232a2d; --line: #354045; --line-2: #2b3438;
  --fg: #e5eaec; --muted: #9aa7ac; --accent: #ec7a45; --accent-fg: #1a0d06; --accent-soft: #3a2418;
  --ink: #ff7d6e; --metal: #8f9aa0; --metal-edge: #cfd6d9; --glass: #23434c; --glass-edge: #5c96a5; --panel-fill: #4a463f;
  --ok: #6fc18f; --warn: #f0b545; --warn-soft: #3a2f16; --view-bg: #20282b; color-scheme: dark }
* { box-sizing: border-box }
html, body { height: 100% }
body { margin: 0; background: var(--bg); color: var(--fg); font: 14px/1.5 var(--f-body); }
body::before { content: ""; position: fixed; inset: 0 0 auto; height: env(safe-area-inset-top, 0px); z-index: 10; background: var(--surface) }
button, input, select { font: inherit; color: inherit }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px }
h2, h3 { font-family: var(--f-display); font-weight: 600; letter-spacing: .02em; margin: 0; text-wrap: balance }
h2 { font-size: 1.35rem } h3 { font-size: 1.12rem; margin: 18px 0 6px }
.muted { color: var(--muted) } .small { font-size: 12.5px } .pad { padding: 16px } .strong { font-weight: 600 }
.warn-text { color: var(--warn) } .danger-text { color: var(--ink) }
.spacer { flex: 1 }
.row { display: flex; align-items: center } .gap { gap: 8px; flex-wrap: wrap }

/* đầu trang */
.top { position: sticky; top: env(safe-area-inset-top, 0px); z-index: 5; display: flex; align-items: center; gap: 18px; flex-wrap: wrap; background: var(--surface); border-bottom: 1px solid var(--line); padding-block: 8px; padding-left: max(16px, env(safe-area-inset-left, 0px)); padding-right: max(16px, env(safe-area-inset-right, 0px)) }
.brand { display: flex; gap: 10px; align-items: center; min-width: 0 }
.brand svg { width: 30px; height: 30px; color: var(--accent); flex: none }
.brand strong { font-family: var(--f-display); font-size: 1.4rem; letter-spacing: .06em; text-transform: uppercase; display: block; line-height: 1 }
.brand span { font-size: 12px; color: var(--muted) }
.tabs { display: flex; gap: 2px; background: var(--surface-2); border: 1px solid var(--line); border-radius: var(--r); padding: 3px; margin-right: auto; overflow-x: auto; max-width: 100% }
.tabs button { border: 0; background: none; padding: 6px 14px; border-radius: 4px; cursor: pointer; white-space: nowrap; font-weight: 500 }
.tabs button b { font-family: var(--f-mono); font-size: 11px; color: var(--muted); margin-right: 4px }
.tabs button[aria-selected="true"] { background: var(--surface); box-shadow: 0 1px 2px rgb(0 0 0 / .12); color: var(--accent) }
.tabs button[aria-selected="true"] b { color: var(--accent) }

main { padding-block: 16px 40px; padding-left: max(16px, env(safe-area-inset-left, 0px)); padding-right: max(16px, env(safe-area-inset-right, 0px)) }
.tabpage { display: flex; flex-direction: column; gap: 16px; max-width: 1500px; margin: 0 auto }
.panel { background: var(--surface); border: 1px solid var(--line); border-radius: var(--r); padding: 16px; min-width: 0 }
.panel-head { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin-bottom: 12px }

/* nút, ô nhập */
.btn { border: 1px solid var(--line); background: var(--surface); border-radius: 5px; padding: 7px 13px; cursor: pointer; font-weight: 500; display: inline-flex; align-items: center; gap: 6px; white-space: nowrap }
.btn:hover { border-color: var(--metal-edge) }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-fg) }
.btn.primary:hover { filter: brightness(1.06) }
.btn.ghost { background: transparent }
.btn.danger { background: var(--ink); border-color: var(--ink); color: #fff }
.btn.small { padding: 4px 9px; font-size: 12.5px }
.btn.icon { padding: 2px 8px; font-size: 16px; line-height: 1.2 }
.btn:disabled { opacity: .5; cursor: default }
.field { display: flex; flex-direction: column; gap: 3px; min-width: 0 }
.lbl { font-size: 11.5px; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); font-weight: 600 }
.field input, .field select, .filters input, .filters select, .roles select, .price-rows input { width: 100%; border: 1px solid var(--line); background: var(--surface-2); border-radius: 5px; padding: 6px 8px; min-width: 0 }
.field input[type=number] { font-family: var(--f-mono); }
.grid2 { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px 12px }
.grid3 { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 10px 12px; margin-top: 12px }
.span2 { grid-column: span 2 }
.chk { display: inline-flex; gap: 5px; align-items: center; font-size: 13px; cursor: pointer }
.badge { display: inline-block; font-size: 10.5px; padding: 0 6px; border-radius: 3px; margin-left: 6px; font-weight: 600; letter-spacing: .03em; vertical-align: middle }
.badge.warn { background: var(--warn-soft); color: var(--warn) }

/* nhập PDF */
.drop { display: flex; flex-direction: column; gap: 4px; align-items: center; text-align: center; border: 1.5px dashed var(--metal-edge); border-radius: var(--r); padding: 22px 16px; cursor: pointer; background: repeating-linear-gradient(135deg, var(--surface-2) 0 10px, var(--surface) 10px 20px) }
.drop.over { border-color: var(--accent); background: var(--accent-soft) }
.drop input { position: absolute; width: 1px; height: 1px; opacity: 0 }
.drop strong { font-family: var(--f-display); font-size: 1.2rem; letter-spacing: .03em }
.drop span { color: var(--muted); font-size: 13px; max-width: 60ch }
#imp-status { margin-top: 10px }
.imp-actions { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; margin: 14px 0 8px; padding: 10px 12px; background: var(--accent-soft); border-radius: var(--r) }
.imp-actions > span { flex-basis: 100%; order: 3 }
.filters { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 10px }
.filters input { flex: 2 1 220px; width: auto } .filters select { flex: 1 1 160px; width: auto }

/* bảng */
.tbl-wrap { overflow-x: auto; max-width: 100% }
.tbl-wrap.tall { max-height: 60vh; overflow-y: auto }
.tbl { border-collapse: collapse; width: 100%; font-size: 13px }
.tbl th { text-align: left; font-size: 11px; text-transform: uppercase; letter-spacing: .05em; color: var(--muted); font-weight: 600; padding: 6px 8px; border-bottom: 1px solid var(--line); position: sticky; top: 0; background: var(--surface); white-space: nowrap }
.tbl td { padding: 6px 8px; border-bottom: 1px solid var(--line-2); vertical-align: middle }
.tbl .num { text-align: right; font-family: var(--f-mono); font-variant-numeric: tabular-nums; white-space: nowrap }
.tbl .code { font-family: var(--f-mono); font-weight: 600; white-space: nowrap }
.tbl tr.click { cursor: pointer } .tbl tr.click:hover td { background: var(--surface-2) }
.tbl tr.off td { opacity: .45 }
.tbl.compact td { padding: 4px 8px }
.tbl input.cell { border: 1px solid transparent; background: transparent; border-radius: 3px; padding: 2px 4px; font-family: inherit; max-width: 100% }
.tbl input.cell:hover, .tbl input.cell:focus { border-color: var(--line); background: var(--surface-2) }
.thumbcell { width: 86px; white-space: nowrap }
.thumbcell img, .role-pic img, .mat-pic img { background: #fff; border-radius: 3px; padding: 2px; max-height: 40px; max-width: 70px; display: inline-block; vertical-align: middle; border: 1px solid var(--line-2) }
.shape { fill: var(--metal); stroke: var(--metal-edge); stroke-width: 1.2; vector-effect: non-scaling-stroke }
.shape.mini { width: 34px; height: 34px; display: inline-block; vertical-align: middle; margin-left: 4px }
.shape.big { width: 160px; height: 120px }
.kind-dot { display: inline-grid; place-items: center; width: 30px; height: 30px; border-radius: 4px; background: var(--surface-2); border: 1px solid var(--line); font-family: var(--f-display); font-weight: 700; color: var(--muted) }

/* thiết kế */
.tabpage.design { display: grid; grid-template-columns: 260px minmax(300px, 380px) minmax(0, 1fr); align-items: start; gap: 14px; max-width: none }
.items { position: sticky; top: 70px }
.item-list { list-style: none; margin: 0 0 10px; padding: 0; display: flex; flex-direction: column; gap: 4px; max-height: 58vh; overflow-y: auto }
.item-list li { display: flex; gap: 10px; align-items: center; padding: 6px; border-radius: 5px; cursor: pointer; border: 1px solid transparent }
.item-list li:hover { background: var(--surface-2) }
.item-list li.on { border-color: var(--accent); background: var(--accent-soft) }
.it-thumb { width: 54px; height: 46px; flex: none; display: grid; place-items: center }
.it-thumb svg, .tpl-thumb svg { width: 100%; height: 100% }
.it-meta { display: flex; flex-direction: column; min-width: 0 } .it-meta strong { font-weight: 600; font-size: 13.5px; line-height: 1.3 }
.item-actions { display: flex; flex-wrap: wrap; gap: 6px }
.roles { display: flex; flex-direction: column; gap: 6px }
.role { display: grid; grid-template-columns: 74px minmax(0, 1fr); gap: 8px; padding: 8px; border: 1px solid var(--line-2); border-radius: 5px; background: var(--surface-2) }
.role.hl, .role:hover { border-color: var(--accent) }
.role-pic { display: grid; place-items: center; min-height: 44px }
.role-main { display: flex; flex-direction: column; gap: 4px; min-width: 0 }
.role-dims { display: flex; gap: 6px; align-items: center; flex-wrap: wrap }
.role-dims label { display: inline-flex; gap: 4px; align-items: center; font-size: 12px; color: var(--muted) }
.role-dims input { width: 62px; border: 1px solid var(--line); background: var(--surface); border-radius: 4px; padding: 2px 5px; font-family: var(--f-mono); font-size: 12.5px }
.refbox img { max-width: 100%; border-radius: 4px; display: block; margin-bottom: 8px }
.views { position: sticky; top: 70px }
.seg { display: inline-flex; border: 1px solid var(--line); border-radius: 5px; overflow: hidden }
.seg button { border: 0; background: var(--surface); padding: 5px 12px; cursor: pointer; font-size: 13px }
.seg button + button { border-left: 1px solid var(--line) }
.seg button[aria-selected="true"] { background: var(--fg); color: var(--surface) }
.view-area { display: grid; gap: 10px; grid-template-columns: 1fr 1fr; height: min(62vh, 640px); min-height: 320px }
.view-area.v-2d { grid-template-columns: 1fr } .view-area.v-2d .v3d { display: none }
.view-area.v-3d { grid-template-columns: 1fr } .view-area.v-3d .v2d { display: none }
.v2d, .v3d { position: relative; border: 1px solid var(--line); border-radius: 5px; overflow: hidden; min-width: 0; min-height: 0 }
.v2d { background: var(--surface); background-image: linear-gradient(var(--line-2) 1px, transparent 1px), linear-gradient(90deg, var(--line-2) 1px, transparent 1px); background-size: 24px 24px; display: grid; place-items: center; padding: 8px }
.v2d svg { width: 100%; height: 100% }
.v3d { background: var(--view-bg) }
.v3d canvas { display: block; cursor: grab }
.v3d .hint { position: absolute; left: 8px; bottom: 6px; font-size: 11px; color: var(--muted); pointer-events: none }
.elev .d-bar { fill: var(--metal); stroke: var(--metal-edge); stroke-linejoin: round }
.elev .d-bar.thin { fill: var(--line) }
.elev .d-bar.hl { fill: var(--accent) }
.elev .d-glass { fill: var(--glass); stroke: var(--glass-edge) }
.elev .d-panel { fill: var(--panel-fill); stroke: var(--metal-edge) }
.elev .d-shine { stroke: #fff; opacity: .55; fill: none }
.elev .d-sym { stroke: var(--metal-edge); fill: none; opacity: .8 }
.elev .d-dim { stroke: var(--ink); fill: none }
.elev .d-dimt { fill: var(--ink); font-family: var(--f-mono); font-weight: 600 }
.elev .d-glabel { fill: var(--glass-edge); font-family: var(--f-mono) }
.elev .d-code { fill: var(--fg); font-family: var(--f-mono); opacity: .75; pointer-events: none }
.elev.thumb .d-bar { stroke-width: .5% }
.note { margin: 8px 0 0; padding: 6px 10px; background: var(--warn-soft); color: var(--warn); border-radius: 4px; font-size: 13px }
.item-cut { margin-top: 6px }
.tpl-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 10px }
.tpl-card { display: flex; flex-direction: column; gap: 4px; align-items: flex-start; text-align: left; border: 1px solid var(--line); background: var(--surface-2); border-radius: var(--r); padding: 10px; cursor: pointer }
.tpl-card:hover { border-color: var(--accent) }
.tpl-thumb { width: 100%; height: 110px; display: grid; place-items: center; margin-bottom: 4px }

/* bóc tách */
.settings { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 10px 12px; margin-bottom: 14px }
.tiles { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 10px }
.tile { display: flex; flex-direction: column; gap: 2px; padding: 12px 14px; border-left: 3px solid var(--accent); background: var(--surface-2); border-radius: 0 5px 5px 0 }
.tile strong { font-family: var(--f-mono); font-size: 1.45rem; font-variant-numeric: tabular-nums; line-height: 1.2 }
.alert { margin-top: 12px; padding: 8px 12px; background: var(--warn-soft); color: var(--warn); border-radius: 5px; font-size: 13px }
.mat-head { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; margin-bottom: 10px }
.mat-head h3 { margin: 0 }
.mat-pic { width: 76px; display: grid; place-items: center }
.mat-stats { display: flex; gap: 16px; flex-wrap: wrap }
.stat { display: flex; flex-direction: column } .stat strong { font-family: var(--f-mono); font-variant-numeric: tabular-nums }
.mat-body { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 16px }
.bars { display: flex; flex-direction: column; gap: 5px; min-width: 0 }
.bar-row { display: flex; gap: 6px; align-items: center }
.bar-n { font-family: var(--f-mono); font-size: 12px; width: 30px; text-align: right; color: var(--muted); flex: none }
.bar { display: flex; flex: 1; height: 22px; background: var(--surface-2); border: 1px solid var(--line); border-radius: 3px; overflow: hidden; min-width: 0 }
.bar .cut { background: var(--metal); border-right: 2px solid var(--surface); font: 600 10.5px var(--f-mono); display: grid; place-items: center; overflow: hidden; white-space: nowrap; color: var(--fg) }
.bar .rest { background: repeating-linear-gradient(135deg, transparent 0 4px, var(--line) 4px 5px); font: 10px var(--f-mono); color: var(--muted); display: grid; place-items: center; overflow: hidden; white-space: nowrap }

/* hộp thoại */
.modal { border: 1px solid var(--line); border-radius: 8px; padding: 0; background: var(--surface); color: var(--fg); width: min(880px, calc(100vw - 32px)); max-height: calc(100vh - 40px) }
.modal::backdrop { background: rgb(10 14 16 / .45) }
.modal-head { display: flex; align-items: center; justify-content: space-between; padding: 12px 16px; border-bottom: 1px solid var(--line) }
.modal-body { padding: 16px; overflow: auto }
.modal-foot { display: flex; justify-content: flex-end; gap: 8px; padding: 12px 16px; border-top: 1px solid var(--line) }
.mat-edit { display: grid; grid-template-columns: 220px minmax(0, 1fr); gap: 18px }
.mat-pics { display: flex; flex-direction: column; gap: 10px; align-items: flex-start }
.mat-pics figure { margin: 0 } .mat-pics img { background: #fff; padding: 6px; border-radius: 4px; max-width: 200px; border: 1px solid var(--line-2) }
.mat-pics figcaption { font-size: 12px; color: var(--muted) }
.price-rows { display: flex; flex-direction: column; gap: 6px; align-items: flex-start }
.price-rows .row { display: grid; grid-template-columns: 90px 1fr auto; gap: 6px; width: 100% }
#toasts { position: fixed; right: max(16px, env(safe-area-inset-right, 0px)); bottom: calc(16px + env(safe-area-inset-bottom, 0px)); display: flex; flex-direction: column; gap: 6px; z-index: 50 }
.toast { background: var(--fg); color: var(--surface); padding: 8px 14px; border-radius: 5px; font-size: 13px; max-width: 360px; box-shadow: 0 4px 14px rgb(0 0 0 / .2) }
.toast.warn { background: var(--warn); color: #fff }

@media (max-width: 1180px) { .tabpage.design { grid-template-columns: 240px minmax(0, 1fr) } .views { grid-column: 1 / -1; position: static } .items { position: static } }
@media (max-width: 760px) {
  .tabpage.design { grid-template-columns: minmax(0, 1fr) }
  .view-area { grid-template-columns: 1fr; height: auto } .v2d, .v3d { height: 340px }
  .grid3, .settings, .tiles { grid-template-columns: repeat(2, minmax(0, 1fr)) }
  .mat-body, .mat-edit { grid-template-columns: minmax(0, 1fr) }
  .brand span { max-width: 60vw }
  .top { position: static; gap: 10px }
  .items, .views { position: static }
}
@media (prefers-reduced-motion: reduce) { * { transition: none !important; animation: none !important } }
.tbl.imp td.small { min-width: 150px }

/* bố cục ô */
.layout-ed { margin-top: 6px }
.crumbs { display: flex; flex-wrap: wrap; gap: 4px; align-items: center; margin-bottom: 8px }
.crumb { border: 1px solid var(--line); background: var(--surface-2); border-radius: 4px; padding: 2px 8px; font-size: 12.5px; cursor: pointer }
.crumb.on { border-color: var(--accent); color: var(--accent); background: var(--accent-soft) }
.ed-card { border: 1px solid var(--accent); border-radius: var(--r); padding: 12px; display: flex; flex-direction: column; gap: 10px; background: var(--surface) }
.ed-title { font-family: var(--f-display); font-size: 1.08rem; font-weight: 600 }
.fill-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(96px, 1fr)); gap: 6px }
.fill-btn { display: flex; flex-direction: column; align-items: center; gap: 3px; border: 1px solid var(--line); background: var(--surface-2); border-radius: 5px; padding: 6px 4px; cursor: pointer; font-size: 11.5px; line-height: 1.25; text-align: center }
.fill-btn.on { border-color: var(--accent); background: var(--accent-soft); color: var(--accent) }
.fill-ico svg { width: 30px; height: 32px; fill: none; stroke: currentColor; stroke-width: 1.6 }
.fill-ico .pfr { fill: var(--glass); stroke: var(--metal-edge) } .fill-ico .pf { fill: var(--panel-fill); stroke: none }
.split-row { display: flex; align-items: center; gap: 6px; flex-wrap: wrap }
.split-row input { width: 56px; border: 1px solid var(--line); background: var(--surface-2); border-radius: 4px; padding: 3px 6px; font-family: var(--f-mono) }
.sizes { display: flex; flex-wrap: wrap; gap: 8px }
.sizes label { display: flex; gap: 4px; align-items: center }
.sizes input { width: 68px; border: 1px solid var(--line); background: var(--surface-2); border-radius: 4px; padding: 3px 6px; font-family: var(--f-mono) }
.elev .d-cell { fill: transparent; stroke: transparent; cursor: pointer }
.elev .d-cell:hover { fill: var(--accent); fill-opacity: .08 }
.elev .d-cell.sel { stroke: var(--accent); fill: var(--accent); fill-opacity: .1 }
.elev .d-mesh { fill: var(--metal); fill-opacity: .35; stroke: var(--metal-edge) }
.elev .d-ghost { fill: var(--line-2); stroke: var(--line) }
.elev .d-sym.in { opacity: .55 }
/* thư viện mẫu */
.modal.wide { width: min(1180px, calc(100vw - 32px)) }
.gal-top { display: flex; flex-direction: column; gap: 8px; margin-bottom: 12px }
.gal-top input { border: 1px solid var(--line); background: var(--surface-2); border-radius: 5px; padding: 7px 10px }
.chips { display: flex; flex-wrap: wrap; gap: 6px }
.chip { border: 1px solid var(--line); background: var(--surface); border-radius: 999px; padding: 4px 12px; cursor: pointer; font-size: 13px }
.chip.on { background: var(--fg); color: var(--surface); border-color: var(--fg) }
.tpl-grid { grid-template-columns: repeat(auto-fill, minmax(170px, 1fr)) }
.tpl-card.start { border-style: dashed; border-color: var(--accent); color: var(--accent) }
.tpl-card .muted { line-height: 1.35 }
.adv { margin-top: 14px } .adv summary { cursor: pointer; margin-bottom: 8px }
/* hướng dẫn */
.guide-hero { display: grid; grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr); gap: 20px; align-items: center }
.guide-hero p { max-width: 62ch }
.hero-pic { height: 380px; display: grid; place-items: center; background: var(--surface-2); border-radius: var(--r); padding: 10px }
.hero-pic svg { width: 100%; height: 100% }
.steps { padding-left: 20px; display: flex; flex-direction: column; gap: 6px; max-width: 64ch }
.part-grid, .type-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 12px; margin: 10px 0 16px }
.part { margin: 0; display: flex; flex-direction: column; gap: 6px; border: 1px solid var(--line-2); border-radius: var(--r); padding: 10px; background: var(--surface-2) }
.part-pic { height: 160px; display: grid; place-items: center } .part-pic svg { width: 100%; height: 100% }
.part figcaption { display: flex; flex-direction: column; gap: 2px; font-size: 13px } .part figcaption strong { font-family: var(--f-display); font-size: 1.05rem }
.gloss { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 10px 18px }
.gl { display: flex; flex-direction: column; gap: 2px; font-size: 13.5px; border-top: 1px solid var(--line-2); padding-top: 8px }
.two-col { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 16px }
.flow { padding-left: 22px; display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 10px 22px }
.flow li { display: flex; flex-direction: column; gap: 2px; font-size: 13.5px }
@media (max-width: 860px) { .guide-hero, .two-col { grid-template-columns: minmax(0, 1fr) } .hero-pic { height: 300px } }

/* ===== bố cục co giãn, thu gọn ===== */
.top { padding-block: 5px; gap: 12px }
.brand svg { width: 24px; height: 24px } .brand strong { font-size: 1.15rem }
.top-tools { display: flex; gap: 6px; margin-left: auto }
.help-btn[aria-selected="true"] { color: var(--accent); border-color: var(--accent) }
.tabs { margin-right: 0 }
main { padding-block: 10px 30px }
.tabpage.design { display: grid; grid-template-columns: var(--c1, 260px) 8px var(--c2, 380px) 8px minmax(0, 1fr); gap: 0; align-items: start; max-width: none }
.tabpage.design > .items { grid-column: 1 } .tabpage.design > .c1s { grid-column: 2 } .tabpage.design > .form { grid-column: 3 } .tabpage.design > .c2s { grid-column: 4 } .tabpage.design > .views { grid-column: 5 }
.tabpage.design.no-form > .form, .tabpage.design.no-form > .c2s { display: none }
.tabpage.design.no-form > .views { grid-column: 3 / 6 }
.split { align-self: stretch; cursor: col-resize; position: relative; touch-action: none; min-height: 40px }
.split::after { content: ""; position: absolute; inset: 0 3px; border-radius: 2px; background: transparent; transition: background .15s }
.split:hover::after, .split.drag::after, .split:focus-visible::after { background: var(--accent) }
.split.hsplit { cursor: row-resize; height: 10px; min-height: 0; margin: 2px 0 6px } .split.hsplit::after { inset: 3px 30% }
.split.vsplit { min-height: 0 }
.panel { padding: 12px }
.items, .views, .form { position: sticky; top: 52px }
.form { max-height: calc(100vh - 64px); overflow-y: auto }
.items { max-height: calc(100vh - 64px); overflow-y: auto }
.tabpage.design.rail .items .panel-head { justify-content: center }
.tabpage.design.rail .item-list li { justify-content: center; padding: 4px }
.tabpage.design.rail .item-actions { justify-content: center }
.view-area { height: var(--vh, 600px); grid-template-columns: minmax(0, var(--va, 1fr)) 8px minmax(0, var(--vb, 1fr)); gap: 0 }
.view-area.v-2d, .view-area.v-3d { grid-template-columns: minmax(0, 1fr) }
.v2d { position: relative }
.v2d svg.plan-inset { position: absolute; left: 8px; top: 8px; width: 150px; height: 110px; background: var(--surface); border: 1px solid var(--line); border-radius: 4px; padding: 4px }
.plan-inset .pl-seg { stroke: var(--metal-edge); stroke-width: var(--pw); stroke-linecap: round } .plan-inset .pl-seg.on { stroke: var(--accent) }
.plan-inset .pl-wall { stroke: var(--muted); stroke-width: calc(var(--pw) * 1.6) }
.plan-inset .pl-t { font: 600 calc(var(--pw) * 6) var(--f-mono); fill: var(--muted); text-anchor: middle }
details.sec { border-top: 1px solid var(--line-2); padding-top: 6px; margin-top: 6px }
details.sec > summary { cursor: pointer; list-style: none; display: flex; align-items: center; gap: 8px; font-family: var(--f-display); font-size: 1.1rem; font-weight: 600; padding: 4px 0 }
details.sec > summary::-webkit-details-marker { display: none }
details.sec > summary::before { content: "▸"; color: var(--muted); font-size: .8em; transition: transform .15s } details.sec[open] > summary::before { transform: rotate(90deg) }
details.sec > :not(summary) { margin-top: 6px }
.adv-params { margin-top: 8px } .adv-params summary { cursor: pointer; font-size: 13px; color: var(--muted) }
.face-tabs { margin-bottom: 8px; flex-wrap: wrap }
.sim { display: flex; flex-direction: column; gap: 8px }
.sim-row { display: flex; flex-wrap: wrap; gap: 8px 14px; align-items: center }
.sim .rng { display: inline-flex; align-items: center; gap: 6px; font-size: 13px; color: var(--muted) }
.sim .rng select, .sim .rng input[type=number] { border: 1px solid var(--line); background: var(--surface-2); border-radius: 4px; padding: 3px 6px; color: var(--fg) }
.sim .sep { width: 1px; align-self: stretch; background: var(--line) }
.sim-info { margin: 0; padding: 8px 10px 8px 26px; background: var(--surface-2); border-radius: 5px; font-size: 13px; display: flex; flex-direction: column; gap: 2px }
body.focus .top, body.focus .tabpage.design > .items, body.focus .tabpage.design > .form, body.focus .tabpage.design > .c1s, body.focus .tabpage.design > .c2s { display: none }
body.focus .tabpage.design > .views { grid-column: 1 / -1; position: static }
body.focus main { padding-block: 8px }
body.focus .view-area { height: calc(100vh - 120px) }
@media (max-width: 1180px) {
  .tabpage.design { grid-template-columns: var(--c1, 240px) 8px minmax(0, 1fr) } .tabpage.design > .c2s { display: none }
  .tabpage.design > .form { grid-column: 3 } .tabpage.design > .views, .tabpage.design.no-form > .views { grid-column: 1 / -1; position: static; margin-top: 12px }
}
@media (max-width: 760px) {
  .tabpage.design { grid-template-columns: minmax(0, 1fr) } .split.c1s, .split.c2s, .split.vsplit { display: none }
  .tabpage.design > * { grid-column: 1 / -1 !important; position: static !important; max-height: none !important; margin-top: 12px }
  .view-area { height: auto } .view-area.v-both { grid-template-columns: minmax(0, 1fr) }
}
.cut-bar { display: flex; flex-wrap: wrap; gap: 8px 12px; align-items: center; margin-bottom: 10px }
.small-tiles { grid-template-columns: repeat(4, minmax(0, 1fr)); margin-bottom: 8px }
.small-tiles .tile { padding: 8px 10px } .small-tiles .tile strong { font-size: 1.15rem }
.mat-sec.c { border-top: 1px solid var(--line-2); padding: 10px 0 }
.mat-sec.c .mat-head { margin-bottom: 6px } .mat-sec.c h3 { font-size: 1rem }
.mat-sec.c .mat-body { grid-template-columns: minmax(0, 1fr) }
.mat-sec.c .mat-stats { gap: 12px } .mat-sec.c .stat strong { font-size: 13px }
.mat-sec.c:hover { background: var(--accent-soft) }
@media (min-width: 1500px) { .mat-sec.c .mat-body { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr) } }
@media (max-width: 760px) { .small-tiles { grid-template-columns: repeat(2, minmax(0, 1fr)) } }
.btn.icon.on { border-color: var(--accent); color: var(--accent); background: var(--accent-soft) } .orient { display: flex; flex-direction: column; gap: 4px }
.surf-sel { max-width: 210px }
.prj-btn { border: 0; background: none; padding: 0; font-size: 12px; color: var(--muted); cursor: pointer; display: block; max-width: 46vw; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; text-align: left }
.prj-btn:hover { color: var(--accent) }
.prj-list { display: flex; flex-direction: column; gap: 6px }
.prj { display: flex; justify-content: space-between; align-items: center; gap: 10px; flex-wrap: wrap; padding: 8px 10px; border: 1px solid var(--line); border-radius: 6px }
.prj.on { border-color: var(--accent); background: var(--accent-soft) }
.prj > div:first-child { display: flex; flex-direction: column }
.imp-draw { display: flex; flex-direction: column; gap: 10px }
.imp-pages { display: flex; gap: 8px; overflow-x: auto } .imp-pages img { height: 140px; border: 1px solid var(--line); border-radius: 4px; background: #fff }
.imp-thumb { width: 64px; height: 56px } .imp-thumb svg { width: 100%; height: 100% }