/* Layout: appbar → danh sách board cuộn ngang → hình (trái) + panel chi tiết (phải, iPad/desktop) hoặc bottom sheet (điện thoại) */
:root {
  --bg: #eef1ef; --surface: #fff; --surface2: #f5f7f6; --fg: #14201a; --muted: #5d6b63; --line: #d6ded9;
  --accent: #157a50; --accent-fg: #fff;
  --c-power: #d33b3b; --c-gnd: #3f4542; --c-gpio: #23945a; --c-adc: #8655d4; --c-comm: #2b78d0;
  --c-usb: #e07b1f; --c-strap: #e2ad00; --c-ban: #9aa39e; --c-ctl: #64748b;
  --ok: #1d8a52; --warn: #b77900; --ban: #c03636; --info: #5b6b78;
  --silk: #eef4f0; --canvas: #e4e9e6;
  --mono: "IBM Plex Mono", ui-monospace, Consolas, monospace;
  --sans: "IBM Plex Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
  --r: 14px; --shadow: 0 1px 2px rgba(0,0,0,.05), 0 4px 16px rgba(0,0,0,.05);
  color-scheme: light;
}
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) {
  --bg: #0c1210; --surface: #141c18; --surface2: #18221d; --fg: #e3ebe6; --muted: #92a399; --line: #26332c;
  --accent: #46c08a; --accent-fg: #06120c; --c-gnd: #59615c; --c-ban: #5f6964; --canvas: #0f1613;
  --shadow: none; color-scheme: dark; } }
:root[data-theme="dark"] {
  --bg: #0c1210; --surface: #141c18; --surface2: #18221d; --fg: #e3ebe6; --muted: #92a399; --line: #26332c;
  --accent: #46c08a; --accent-fg: #06120c; --c-gnd: #59615c; --c-ban: #5f6964; --canvas: #0f1613;
  --shadow: none; color-scheme: dark; }

*, *::before, *::after { box-sizing: border-box; }
[hidden] { display: none !important; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--fg); font: 15px/1.5 var(--sans); -webkit-tap-highlight-color: transparent; }
button, input, select { font: inherit; color: inherit; }
button { cursor: pointer; }
a { color: var(--accent); }
.muted { color: var(--muted); } .small { font-size: 13px; } .mono { font-family: var(--mono); }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--r); box-shadow: var(--shadow); }

/* App bar */
.appbar { position: sticky; top: 0; z-index: 20; display: flex; align-items: center; gap: 12px;
  padding: calc(8px + env(safe-area-inset-top)) max(16px, env(safe-area-inset-right)) 8px max(16px, env(safe-area-inset-left));
  background: color-mix(in srgb, var(--surface) 88%, transparent); backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px); border-bottom: 1px solid var(--line); }
.brand { display: flex; align-items: center; gap: 10px; min-width: 0; }
.brand b { display: block; font-size: 15px; line-height: 1.1; }
.brand span { display: block; font-size: 11px; color: var(--muted); }
.tabbar { margin-left: auto; display: flex; gap: 2px; background: var(--surface2); border: 1px solid var(--line); border-radius: 10px; padding: 3px; }
.tabbar button { border: 0; background: none; padding: 6px 12px; border-radius: 7px; font-size: 14px; font-weight: 500; color: var(--muted); white-space: nowrap; }
.tabbar button[aria-selected="true"] { background: var(--surface); color: var(--fg); box-shadow: 0 1px 3px rgba(0,0,0,.12); }
.icon-btn { width: 38px; height: 38px; flex: none; display: grid; place-items: center; border: 1px solid var(--line); background: var(--surface); border-radius: 10px; font-size: 17px; }
.icon-btn:active { transform: scale(.96); }

main { max-width: 1320px; margin: 0 auto; padding: 14px max(16px, env(safe-area-inset-right)) calc(28px + env(safe-area-inset-bottom)) max(16px, env(safe-area-inset-left)); }

/* Danh sách board */
.boards { display: flex; gap: 8px; overflow-x: auto; scroll-snap-type: x proximity; padding-bottom: 10px; margin-bottom: 4px; scrollbar-width: thin; }
.board-card { flex: none; scroll-snap-align: start; display: grid; grid-template-columns: 1fr auto; gap: 0 10px; text-align: left; min-width: 172px;
  padding: 10px 12px; border: 1px solid var(--line); border-radius: 12px; background: var(--surface); }
.board-card[aria-pressed="true"] { border-color: var(--accent); box-shadow: inset 0 0 0 1px var(--accent); }
.bc-name { font-weight: 600; font-size: 14px; }
.bc-chip { grid-column: 1; font: 12px var(--mono); color: var(--muted); }
.bc-logic { grid-row: 1 / 3; grid-column: 2; align-self: center; font: 600 11px var(--mono); padding: 3px 6px; border-radius: 6px; background: var(--surface2); border: 1px solid var(--line); }
.bc-logic.l5 { color: var(--c-usb); }

/* Bố cục chính */
.layout { display: grid; grid-template-columns: minmax(0, 1fr) 360px; gap: 14px; align-items: start; }
.stage { padding: 14px; min-width: 0; }
.stage-head { display: flex; justify-content: space-between; gap: 12px; align-items: flex-start; flex-wrap: wrap; }
.stage-head h1 { margin: 0; font-size: 19px; letter-spacing: -.01em; }
.stage-head p { margin: 2px 0 0; }
.seg { display: inline-flex; background: var(--surface2); border: 1px solid var(--line); border-radius: 10px; padding: 3px; }
.seg button { border: 0; background: none; padding: 6px 12px; border-radius: 7px; font-size: 13px; font-weight: 600; color: var(--muted); }
.seg button[aria-pressed="true"] { background: var(--accent); color: var(--accent-fg); }
.toolbar { display: flex; gap: 8px; margin: 12px 0 8px; }
.search { flex: 1; min-width: 0; display: flex; align-items: center; gap: 8px; padding: 0 12px; border: 1px solid var(--line); border-radius: 10px; background: var(--surface2); }
.search:focus-within { border-color: var(--accent); }
.search input { flex: 1; min-width: 0; border: 0; outline: 0; background: none; padding: 9px 0; font: 15px var(--mono); }
.zoom { display: flex; gap: 6px; }
.chips { display: flex; gap: 6px; overflow-x: auto; padding-bottom: 4px; scrollbar-width: none; }
.chip { flex: none; border: 1px solid var(--line); background: var(--surface); border-radius: 999px; padding: 5px 12px; font: 500 13px var(--mono); }
.chip[aria-pressed="true"] { background: var(--fg); color: var(--surface); border-color: var(--fg); }
.canvas { margin-top: 8px; border-radius: 10px; background: var(--canvas); overflow: auto; max-height: 76vh; -webkit-overflow-scrolling: touch;
  background-image: radial-gradient(color-mix(in srgb, var(--muted) 22%, transparent) 1px, transparent 1px); background-size: 16px 16px; }
#svg { display: block; width: 100%; height: auto; margin: 0 auto; max-height: none; touch-action: manipulation; }
.stage-foot { display: flex; justify-content: space-between; gap: 10px; align-items: center; margin-top: 10px; flex-wrap: wrap; }
.legend { display: flex; flex-wrap: wrap; gap: 4px 12px; font-size: 12px; color: var(--muted); }
.lg { display: inline-flex; align-items: center; gap: 5px; }
.lg i { width: 10px; height: 10px; border-radius: 3px; display: inline-block; }
.note { margin: 8px 0 0; color: var(--muted); border-left: 3px solid var(--line); padding-left: 8px; }

/* SVG */
#svg text { font-family: var(--mono); font-weight: 500; }
#svg .silk { fill: var(--silk); opacity: .85; font-weight: 600; }
#svg .engr { fill: #3a4045; font-weight: 600; }
#svg .chiptxt { fill: #c8cfcb; }
#svg .alt { fill: var(--muted); }
#svg .pad { fill: #d4b25a; stroke: #a8862f; stroke-width: .12; }
#svg .drill { fill: #1a1a1a; }
#svg .ring { stroke: transparent; stroke-width: .35; }
#svg .pin { cursor: pointer; outline: none; transition: opacity .15s; }
#svg .pin:hover .tab, #svg .pin:focus-visible .tab { filter: brightness(1.12); }
#svg .pin.sel .ring, #svg .pin:focus-visible .ring { stroke: #fff; }
#svg .pin.sel .tab { stroke: var(--fg); stroke-width: .3; }
#svg .pin.dim { opacity: .14; }
#svg .lead { opacity: .8; }
#svg .led { filter: drop-shadow(0 0 .6px currentColor); }
#svg.sch .symbox, #svg.sch .mcu { fill: var(--surface); stroke: var(--fg); stroke-width: .25; }
#svg.sch .mcu { fill: var(--surface2); stroke-dasharray: .8 .5; }
#svg.sch .symtitle { fill: var(--fg); font-weight: 600; }
#svg.sch .wire { stroke: var(--fg); stroke-width: .2; }
#svg.sch .node { fill: var(--fg); }
#svg.sch .pnum { fill: var(--muted); }
#svg.sch .pin.sel .tab { stroke: var(--fg); stroke-width: .35; }

/* Panel chi tiết */
.detail { position: sticky; top: 76px; padding: 16px; max-height: calc(100vh - 92px); overflow: auto; }
.grab { display: none; }
.d-head { display: flex; justify-content: space-between; gap: 10px; align-items: flex-start; }
.d-head h2 { margin: 0; font-size: 24px; line-height: 1.2; }
.d-kicker { font: 500 12px var(--mono); color: var(--muted); text-transform: uppercase; letter-spacing: .03em; }
.d-head .icon-btn { width: 32px; height: 32px; font-size: 14px; }
.badges { display: flex; gap: 6px; margin: 10px 0 4px; flex-wrap: wrap; }
.badge { font: 600 12px var(--mono); padding: 3px 8px; border-radius: 6px; color: #fff; background: var(--b); }
.st { font-size: 12px; font-weight: 600; padding: 3px 8px; border-radius: 6px; border: 1px solid currentColor; }
.st.ok { color: var(--ok); } .st.warn { color: var(--warn); } .st.ban { color: var(--ban); } .st.info { color: var(--info); }
.d-sec { margin: 16px 0 6px; font: 600 11px var(--mono); text-transform: uppercase; letter-spacing: .06em; color: var(--muted); }
.fns { display: flex; flex-wrap: wrap; gap: 5px; }
.fns span { font: 13px var(--mono); padding: 3px 8px; border-radius: 6px; background: var(--surface2); border: 1px solid var(--line); }
.warn { margin-top: 12px; padding: 10px 12px; border-radius: 10px; font-size: 14px; background: color-mix(in srgb, var(--warn) 12%, transparent); border-left: 3px solid var(--warn); }
.warn.ban { background: color-mix(in srgb, var(--ban) 12%, transparent); border-color: var(--ban); }
.warn.info, .warn.ok { background: var(--surface2); border-color: var(--info); }
.notes { margin: 0; padding-left: 18px; font-size: 14px; } .notes li + li { margin-top: 4px; }
.parts { width: 100%; border-collapse: collapse; font-size: 14px; }
.parts th { text-align: left; vertical-align: top; font-weight: 600; padding: 6px 10px 6px 0; white-space: nowrap; width: 1%; }
.parts td { padding: 6px 0; border-top: 1px solid var(--line); } .parts th { border-top: 1px solid var(--line); }
.src { font: 11px var(--mono); color: var(--muted); border: 1px solid var(--line); border-radius: 4px; padding: 0 4px; white-space: nowrap; }
.facts { display: grid; grid-template-columns: auto 1fr; gap: 6px 12px; font-size: 14px; margin: 12px 0 0; }
.facts dt { color: var(--muted); } .facts dd { margin: 0; }
.docs { list-style: none; margin: 0; padding: 0; display: grid; gap: 6px; }
.docs a { display: grid; grid-template-columns: auto 1fr auto; gap: 8px; align-items: center; padding: 9px 10px; border: 1px solid var(--line); border-radius: 10px; text-decoration: none; color: var(--fg); background: var(--surface2); font-size: 14px; }
.docs a:active { transform: scale(.99); }
.dk { font: 600 10px var(--mono); text-transform: uppercase; padding: 2px 6px; border-radius: 5px; background: var(--accent); color: var(--accent-fg); }
.ext { color: var(--muted); }
.hint { font-size: 13px; color: var(--muted); }

/* Tính toán / tài liệu */
.grid2 { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 14px; }
.card.calc, #docsAll .card { padding: 16px; }
.card h3 { margin: 0 0 10px; font-size: 16px; }
.f3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; }
.f3 label { font-size: 12px; color: var(--muted); display: grid; gap: 4px; }
.f3 input, .f3 select { width: 100%; min-width: 0; padding: 9px 10px; border: 1px solid var(--line); border-radius: 9px; background: var(--surface2); font: 15px var(--mono); color: var(--fg); }
.f3 input:focus, .f3 select:focus { outline: 2px solid var(--accent); outline-offset: -1px; }
.out { font-size: 14px; padding: 10px 12px; border-radius: 10px; background: var(--surface2); border: 1px solid var(--line); line-height: 1.7; }
.out b { font-family: var(--mono); }
.bad { color: var(--ban); }

/* iPad dọc & điện thoại */
@media (max-width: 899px) {
  .layout { grid-template-columns: 1fr; }
  .detail { position: fixed; left: 0; right: 0; bottom: 0; top: auto; z-index: 30; max-height: 62vh; border-radius: 18px 18px 0 0;
    padding: 8px max(16px, env(safe-area-inset-right)) calc(16px + env(safe-area-inset-bottom)) max(16px, env(safe-area-inset-left));
    transform: translateY(calc(100% - 64px - env(safe-area-inset-bottom))); transition: transform .25s ease; box-shadow: 0 -8px 30px rgba(0,0,0,.18); }
  .detail.open { transform: none; }
  .grab { display: block; cursor: pointer; width: 60px; height: 6px; padding: 0; box-sizing: content-box; border-top: 8px solid transparent; border-bottom: 8px solid transparent; background-clip: padding-box; border-radius: 2px; background: var(--line); margin: 0 auto 10px; }
  main { padding-bottom: calc(90px + env(safe-area-inset-bottom)); }
  .canvas { max-height: none; }
}
@media (max-width: 560px) {
  .appbar { flex-wrap: wrap; }
  .brand span { display: none; }
  .tabbar { order: 3; width: 100%; margin: 0; }
  .tabbar button { flex: 1; }
  #theme { margin-left: auto; }
  .stage { padding: 10px; border-radius: 12px; }
  .stage-head h1 { font-size: 17px; }
  .grid2 { grid-template-columns: 1fr; }
}

/* Thông số chip (bảng, thẻ số liệu, thanh so sánh) */
.spec { padding: 16px; margin-top: 14px; }
.spec h2 { margin: 0; font-size: 17px; }
.spec .chips { margin: 10px 0 12px; }
.spec table { width: 100%; border-collapse: collapse; font-size: 14px; }
.spec th, .spec td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--line); vertical-align: top; }
.spec th { font: 600 12px var(--mono); color: var(--muted); background: var(--surface2); }
.spec td.num { text-align: right; font-family: var(--mono); white-space: nowrap; }
.spec p { font-size: 14px; color: var(--muted); }
.tw { overflow-x: auto; -webkit-overflow-scrolling: touch; }
.kv { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 10px; margin-bottom: 12px; }
.kv div { border: 1px solid var(--line); border-radius: 10px; padding: 10px 12px; background: var(--surface2); }
.kv b { display: block; font: 600 18px var(--mono); }
.kv span { font-size: 12px; color: var(--muted); }
.bar { height: 8px; border-radius: 4px; background: var(--c-adc); min-width: 2px; }
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 10px; }
.pcard { border: 1px solid var(--line); border-radius: 10px; padding: 12px; font-size: 14px; background: var(--surface2); }
.pcard h3 { margin: 0 0 4px; font-size: 15px; display: flex; justify-content: space-between; gap: 8px; }
.pcard h3 small { font: 500 12px var(--mono); color: var(--muted); }
.pcard .pins { margin-top: 6px; font: 12px var(--mono); color: var(--accent); }
.spec em.hdg, .spec em.ds, .spec em.std { font: 500 11px var(--mono); font-style: normal; padding: 2px 6px; border-radius: 4px; border: 1px solid var(--line); }
.spec em.hdg { color: var(--ok); } .spec em.ds { color: var(--c-comm); } .spec em.std { color: var(--muted); }

/* Danh sách board xếp thành cột bên trái (iPad ngang/desktop), lưới 2 cột trên điện thoại */
@media (min-width: 900px) {
  section[data-panel="pins"] { display: grid; grid-template-columns: 210px minmax(0, 1fr); gap: 14px; align-items: start; }
  section[data-panel="pins"] > .boards { grid-row: 1 / span 3; position: sticky; top: 76px; flex-direction: column; overflow: visible; padding: 0; margin: 0; }
  section[data-panel="pins"] > .spec { grid-column: 2; margin-top: 0; }
  .board-card { min-width: 0; width: 100%; }
  .layout { grid-template-columns: minmax(0, 1fr) 340px; }
}
@media (max-width: 899px) {
  .boards { display: flex; flex-direction: column; gap: 6px; overflow: visible; padding-bottom: 0; margin-bottom: 12px; }
  .board-card { min-width: 0; }
  .board-card { padding: 8px 12px; }
}

/* Schematic hãng: ảnh trang PDF, cuộn/zoom trong khung */
.oem { margin-top: 10px; display: grid; gap: 12px; }
.oem figure { margin: 0; }
.oem figcaption { font: 600 12px var(--mono); color: var(--muted); margin-bottom: 6px; }
.oem-img { overflow: auto; max-height: 76vh; border-radius: 10px; border: 1px solid var(--line); background: #fff; -webkit-overflow-scrolling: touch; }
.oem-img img { display: block; max-width: none; height: auto; }
.credit { font-size: 13px; color: var(--muted); margin: 0; border-left: 3px solid var(--accent); padding-left: 8px; }

/* Thẻ board: icon chữ viết tắt nổi bật, tên đầy đủ chữ nhỏ bên cạnh */
.board-card { display: flex; align-items: center; gap: 10px; padding: 8px 10px; }
.bc-icon { flex: none; width: 44px; height: 44px; border-radius: 11px; display: grid; place-items: center; font: 700 15px var(--mono); color: #fff; letter-spacing: -.02em; box-shadow: inset 0 -3px 0 rgba(0,0,0,.18); }
.bc-icon.esp { background: linear-gradient(135deg, #e8473c, #b8231b); }
.bc-icon.rp { background: linear-gradient(135deg, #d6245b, #8f1239); }
.bc-icon.avr { background: linear-gradient(135deg, #1aa3a8, #0b6f7a); }
.bc-txt { min-width: 0; display: grid; }
.board-card .bc-name { font-size: 12.5px; font-weight: 600; line-height: 1.25; }
.board-card .bc-chip { font-size: 11px; line-height: 1.3; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.board-card[aria-pressed="true"] .bc-icon { box-shadow: 0 0 0 2px var(--surface), 0 0 0 4px var(--accent); }
@media (max-width: 899px) {
  .boards { display: grid !important; grid-template-columns: repeat(auto-fill, minmax(64px, 1fr)); gap: 8px; }
  .board-card { flex-direction: column; gap: 4px; padding: 8px 4px; text-align: center; }
  .board-card .bc-chip { display: none; }
  .board-card .bc-name { font-size: 10.5px; font-weight: 500; color: var(--muted); display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
}

/* Panel chân kiểu bản cũ: banner trạng thái, thông số điện, thẻ linh kiện có nhãn nguồn */
.d-head h2 { font: 700 26px var(--mono); }
.d-head .d-kicker { text-transform: none; letter-spacing: 0; margin-top: 2px; }
.status { margin-top: 12px; padding: 10px 12px; border-radius: 8px; font-weight: 600; font-size: 14px; border-left: 4px solid; }
.status.ok { border-color: var(--c-gpio); background: color-mix(in srgb, var(--c-gpio) 12%, transparent); }
.status.warn { border-color: var(--c-strap); background: color-mix(in srgb, var(--c-strap) 16%, transparent); }
.status.ban { border-color: var(--c-power); background: color-mix(in srgb, var(--c-power) 12%, transparent); }
.status.info { border-color: var(--c-ctl); background: color-mix(in srgb, var(--c-ctl) 12%, transparent); }
.wtext { margin: 12px 0 0; font-size: 14.5px; }
.notes { margin-top: 10px; color: var(--muted); }
.fns { margin-top: 12px; }
.fns span { font: 600 12px var(--mono); background: var(--surface); }
.elec { display: grid; grid-template-columns: auto 1fr; gap: 6px 14px; margin: 14px 0 0; font-size: 14px; }
.elec dt { color: var(--muted); } .elec dd { margin: 0; font-family: var(--mono); font-size: 13.5px; }
.pparts { display: grid; gap: 8px; }
.pp { border: 1px solid var(--line); border-radius: 10px; padding: 10px 12px; font-size: 14px; }
.pp b { display: block; margin-bottom: 2px; }
.pp .tag { display: block; margin-top: 6px; padding: 2px 6px; border-radius: 4px; font: 600 11px var(--mono); }
.tag.hdg { background: color-mix(in srgb, var(--c-gpio) 16%, transparent); }
.tag.ds { background: color-mix(in srgb, var(--c-comm) 16%, transparent); }
.tag.std { background: color-mix(in srgb, var(--muted) 18%, transparent); }
.srcline { margin: 14px 0 0; font-size: 12.5px; color: var(--muted); }

/* Tab thông số: nút chữ nhật, font mono, nút đang chọn tô màu đậm */
#specTabs { display: flex; flex-wrap: wrap; gap: 6px; overflow: visible; }
.stab { border: 1px solid var(--line); background: var(--surface); border-radius: 6px; padding: 7px 12px; font: 500 13px var(--mono); }
.stab[aria-pressed="true"] { background: var(--accent); border-color: var(--accent); color: var(--accent-fg); }
.spec h2 { font: 700 17px var(--mono); }
.spec th { text-transform: uppercase; letter-spacing: .04em; font-size: 11px; background: none; }
.spec td:nth-child(2) { font-family: var(--mono); font-size: 13px; }
.kv b { font-size: 19px; }
@media (max-width: 560px) { #specTabs { flex-wrap: nowrap; overflow-x: auto; } .stab { flex: none; } }

/* Kiến trúc module */
#svg.sch .buslbl { fill: var(--fg); font-weight: 600; }
.oem-img img { cursor: zoom-in; }

/* Popup zoom ảnh schematic hãng */
.lightbox { position: fixed; inset: 0; z-index: 100; background: rgba(10, 14, 12, .94); display: flex; flex-direction: column; }
.lb-bar { display: flex; align-items: center; gap: 8px; padding: calc(10px + env(safe-area-inset-top)) max(12px, env(safe-area-inset-right)) 10px max(12px, env(safe-area-inset-left)); color: #e6ece8; }
.lb-bar span { flex: 1; font: 600 13px var(--mono); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.lb-bar .icon-btn { background: #1f2824; border-color: #33403a; color: #fff; }
.lb-stage { flex: 1; overflow: hidden; position: relative; touch-action: none; cursor: grab; }
.lb-stage img { position: absolute; left: 0; top: 0; width: 100%; height: 100%; object-fit: contain; transform-origin: 0 0; user-select: none; -webkit-user-select: none; }
.lb-hint { margin: 0; padding: 8px 12px calc(8px + env(safe-area-inset-bottom)); text-align: center; font-size: 12px; color: #9aa79f; }

/* Icon board = hình PCB thu nhỏ + nhãn viết tắt */
.bc-icon { position: relative; width: 48px; height: 48px; background: var(--surface2) !important; border: 1px solid var(--line); box-shadow: none; padding: 3px 3px 12px; }
.bc-icon svg { width: 100%; height: 100%; display: block; filter: drop-shadow(0 1px 1px rgba(0,0,0,.25)); }
.bc-icon b { position: absolute; left: 50%; bottom: -5px; transform: translateX(-50%); font: 700 10px var(--mono); padding: 1px 5px; border-radius: 5px; color: #fff; white-space: nowrap; }
.bc-icon.esp b { background: #d23a2f; } .bc-icon.rp b { background: #b81a4c; } .bc-icon.avr b { background: #0f8a93; }
.board-card[aria-pressed="true"] .bc-icon { box-shadow: 0 0 0 2px var(--accent); }

/* Ô chọn giao diện nhỏ góc phải */
.skin { height: 38px; padding: 0 8px; border: 1px solid var(--line); border-radius: 10px; background: var(--surface); font: 600 13px var(--mono); color: var(--fg); }
@media (max-width: 560px) { .skin { margin-left: auto; } #theme { margin-left: 0; } }

/* Nút mặt trời / mặt trăng */
.daynight { display: inline-flex; border: 1px solid var(--line); border-radius: 10px; overflow: hidden; background: var(--surface2); }
.daynight button { width: 36px; height: 36px; border: 0; background: none; font-size: 17px; color: var(--muted); }
.daynight button[aria-pressed="true"] { background: var(--accent); color: var(--accent-fg); }
@media (max-width: 560px) { .daynight { margin-left: auto; } .skin { margin-left: 0; } }

/* Bố cục chặt hơn: 900–1399px danh sách board thành thanh icon hẹp; ≥1400px mới hiện tên */
@media (min-width: 900px) and (max-width: 1399px) {
  section[data-panel="pins"] { grid-template-columns: 76px minmax(0, 1fr); gap: 12px; }
  section[data-panel="pins"] > .boards { gap: 8px; }
  .board-card { flex-direction: column; padding: 6px 4px 10px; gap: 6px; text-align: center; }
  .board-card .bc-chip { display: none; }
  .board-card .bc-name { font-size: 10.5px !important; line-height: 1.15 !important; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
  .layout { grid-template-columns: minmax(0, 1fr) 320px; gap: 12px; }
}
@media (min-width: 1400px) { main { max-width: 1440px; } }
main { padding-top: 12px; }
.stage { padding: 12px; }
.toolbar { margin: 10px 0 6px; }
#svg.sch { cursor: zoom-in; }

/* Bỏ lưới nền trong khung hình board (mọi giao diện) */
.canvas, :root:not([data-theme="light"]) .canvas { background-image: none !important; }

/* Nút cờ Việt / Anh */
.langsw button { display: grid; place-items: center; opacity: .55; }
.langsw button[aria-pressed="true"] { opacity: 1; background: rgba(255,255,255,.18) !important; }
.langsw svg { display: block; box-shadow: 0 0 0 1px rgba(0,0,0,.35); }
@media (max-width: 560px) { .langsw { margin-left: auto; } .langsw + .daynight { margin-left: 0; } }

/* Khối nội dung tĩnh cho SEO (bảng chân + liên kết board) */
.seo table { font-size: 13px; }
.seo-links { display: flex; flex-wrap: wrap; gap: 6px 16px; padding-left: 18px; margin: 6px 0 0; }
.seo-links li { min-width: 220px; }
.seo h3 { margin: 16px 0 4px; }
@media (min-width: 900px) { section[data-panel="pins"] > .seo { grid-column: 2; } }

/* Nút chia sẻ + thông báo nhỏ */
.d-act { display: flex; gap: 6px; }
.btn-share { width: 100%; margin-top: 14px; padding: 10px; border: 0; border-radius: 10px; background: var(--accent); color: var(--accent-fg); font-weight: 600; font-size: 15px; }
.toast { position: fixed; left: 50%; bottom: calc(90px + env(safe-area-inset-bottom)); transform: translateX(-50%); z-index: 200; background: #111; color: #fff; padding: 10px 16px; border-radius: 10px; font-size: 14px; }