/* 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: #0a4d8c; --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: #00AEEF; --accent-fg: #042038; --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: #00AEEF; --accent-fg: #042038; --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); }

/* 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; }
.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 5; position: sticky; top: 76px; flex-direction: column; overflow: visible; padding: 0; margin: 0; }
  section[data-panel="pins"] > .spec, section[data-panel="pins"] > .buy { 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; }

/* ⚡ BUILD: nút vàng nổi bật + panel ghép module */
.stage-head { align-items: center; }
#svg .modbox { fill: var(--surface); stroke-width: .35; }
#svg .modt { fill: #111; font-weight: 700; }
#svg .mptxt { fill: var(--fg); } #svg .mpval { fill: var(--muted); }
#svg .mpin { cursor: pointer; } #svg .mprow { fill: transparent; }
#svg .mpin:hover .mprow, #svg .mpin.on .mprow { fill: color-mix(in srgb, #f5d63d 30%, transparent); }
#svg .hint { animation: blink 1s steps(2) infinite; }
.btabs { margin: 10px 0; }
.bwarn { display: grid; gap: 4px; margin: 8px 0; font-size: 13px; }
.bwarn .w-ban { color: var(--ban); } .bwarn .w-warn { color: var(--warn); } .bwarn .w-info { color: var(--muted); }
.bcard { border: 1px solid var(--line); border-left: 4px solid var(--mc); border-radius: 10px; padding: 8px 10px; margin-top: 10px; }
.bc-h { display: flex; gap: 8px; align-items: center; } .bc-h span { font: 12px var(--mono); color: var(--muted); flex: 1; }
.bc-h .bx { width: 28px; height: 28px; font-size: 12px; }
.btbl { width: 100%; border-collapse: collapse; margin-top: 6px; font-size: 13px; }
.btbl th { text-align: left; font: 600 12px var(--mono); padding: 3px 6px 3px 0; white-space: nowrap; }
.btbl select { width: 100%; padding: 4px 6px; border: 1px solid var(--line); border-radius: 6px; background: var(--surface2); color: var(--fg); font: 13px var(--mono); }
.btbl tr.on th { color: #f5d63d; }
.btbl .tap { border: 1px solid var(--line); background: var(--surface2); border-radius: 6px; padding: 3px 7px; margin-left: 4px; }
.bcode { max-height: 50vh; font-size: 12.5px; }
.bexp { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 14px; }
.bexp button, .bexp label { border: 1px solid var(--line); background: var(--surface2); border-radius: 8px; padding: 6px 10px; font-size: 13px; cursor: pointer; }

/* Tab Build: khu vẽ node + thanh bên */
.bwrap { display: grid; grid-template-columns: minmax(0, 1fr) 400px; gap: 12px; align-items: start; }
.bstage { padding: 10px; }
.bbar { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; margin-bottom: 8px; }
.bbar select { padding: 7px 10px; border: 1px solid var(--line); border-radius: 8px; background: var(--surface2); color: var(--fg); font-weight: 600; }
.btools { display: flex; gap: 6px; align-items: center; flex-wrap: wrap; }
.bbtn { padding: 6px 10px; border: 1px solid var(--line); border-radius: 8px; background: var(--surface2); color: var(--fg); font: 600 12.5px var(--mono); cursor: pointer; white-space: nowrap; transition: background .15s, border-color .15s; }
.bbtn:hover { border-color: var(--accent); background: var(--surface); }
.bslider { display: inline-flex; align-items: center; gap: 6px; padding: 4px 10px; border: 1px solid var(--line); border-radius: 8px; background: var(--surface2); font: 600 12px var(--mono); color: var(--fg); white-space: nowrap; }
.bslider input[type="range"] { width: 78px; accent-color: #f5d63d; cursor: pointer; margin: 0; }
.bbar .zoom { margin-left: auto; }
#bsvg { display: block; width: 100%; height: min(76vh, 900px); background: var(--canvas); border-radius: 10px; touch-action: none; cursor: grab; user-select: none; -webkit-user-select: none; }
#bsvg text { font-family: var(--mono); font-weight: 600; pointer-events: none; }
#bsvg .silk { fill: var(--silk); } #bsvg .engr { fill: #3a4045; } #bsvg .chiptxt { fill: #c8cfcb; } #bsvg .alt { fill: var(--muted); }
#bsvg .pad { fill: #d4b25a; stroke: #a8862f; stroke-width: .12; } #bsvg .drill { fill: #1a1a1a; }
#bsvg .modbox { fill: var(--surface); stroke-width: .4; filter: drop-shadow(0 .4px .8px rgba(0,0,0,.4)); }
#bsvg .bhead { cursor: move; } #bsvg .modt { fill: #111; font-weight: 800; }
#bsvg .mptxt { fill: var(--fg); } #bsvg .mpval { fill: var(--muted); }
#bsvg .sock { cursor: crosshair; } #bsvg .sock.armed { stroke: #fff; stroke-width: .7; }
#bsvg .bwire { fill: none; stroke-width: .5; stroke-linecap: round; opacity: .95; }
#bsvg .bwire.tmp { stroke-dasharray: 1 .6; }
#bsvg .glow { fill: none; stroke-width: .5; animation: padglow 1s ease-in-out infinite alternate; pointer-events: none; }
#bsvg .glow.ok { stroke: #2fd36b; fill: rgba(47,211,107,.18); } #bsvg .glow.warn { stroke: #ffa300; fill: rgba(255,163,0,.14); } #bsvg .glow.busy { stroke: #888; stroke-dasharray: .5 .4; }
@keyframes padglow { from { stroke-opacity: .35; } to { stroke-opacity: 1; } }
.bside { padding: 14px; max-height: calc(100vh - 92px); overflow: auto; position: sticky; top: 76px; }
.btn-auto { width: 100%; margin: 6px 0; padding: 8px; border: 1px dashed #f5d63d; border-radius: 8px; background: transparent; color: var(--fg); font-weight: 600; }
.bwarn .w-todo { color: var(--muted); }
@media (max-width: 899px) { .bwrap { grid-template-columns: 1fr; } .bside { position: static; max-height: none; } #bsvg { height: 60vh; } }

#bsvg .padname { font-weight: 700; fill: #f4f2dc !important; paint-order: stroke; stroke: rgba(0,0,0,.7); stroke-width: .3; }
#bsvg .bwire { stroke-width: .45; stroke-linejoin: round; }

.blegend { display: flex; flex-wrap: wrap; gap: 4px 12px; margin: 6px 0 10px; font-size: 12px; color: var(--muted); }
.blegend i { display: inline-block; width: 14px; height: 4px; border-radius: 2px; margin-right: 5px; vertical-align: middle; }
#bsvg .wend { cursor: grab; }

#bsvg .whit { fill: none; stroke: transparent; stroke-width: 1.8; cursor: move; }
#bsvg .whit:hover + * , #bsvg .whit:hover { stroke: rgba(255,255,255,.08); }
#bsvg .wlabel { font-weight: 800; fill: #cfd6d2 !important; paint-order: stroke; stroke: rgba(0,0,0,.75); stroke-width: .22; pointer-events: none; }

/* Listdown chọn linh kiện phân loại + tìm kiếm */
.mdrop { border: 1px solid var(--line); border-radius: 10px; background: var(--surface2); margin: 8px 0; overflow: hidden; }
.mdrop-btn { width: 100%; display: flex; justify-content: space-between; align-items: center; padding: 9px 12px; border: 0; background: transparent; color: var(--fg); font: 700 13px var(--mono); cursor: pointer; }
.mdrop-btn:hover { background: rgba(255,255,255,.04); }
.mdrop-body { border-top: 1px solid var(--line); padding: 8px; display: grid; gap: 8px; max-height: 320px; overflow-y: auto; }
.msearch { display: flex; align-items: center; gap: 6px; padding: 5px 9px; border: 1px solid var(--line); border-radius: 7px; background: var(--surface); }
.msearch input { width: 100%; border: 0; background: transparent; color: var(--fg); font: 12.5px var(--mono); outline: none; }
.mcat-h { font: 700 11px var(--mono); color: var(--muted); text-transform: uppercase; letter-spacing: .04em; margin: 4px 2px 3px; }
.mlist { display: grid; grid-template-columns: 1fr 1fr; gap: 5px; }
.mitem > span:first-child { flex: none; }
.mitem { display: flex; align-items: center; gap: 4px; padding: 4px 6px; border: 1px solid var(--line); border-left: 3px solid var(--mc); border-radius: 7px; background: var(--surface); color: var(--fg); font: 600 11.5px var(--mono); letter-spacing: -.04em; cursor: pointer; text-align: left; }
.mitem:hover { border-color: var(--mc); }
.mitem.on { background: color-mix(in srgb, var(--mc) 22%, var(--surface)); border-color: var(--mc); }
.mitem:disabled { opacity: .35; cursor: not-allowed; }
.mitem .mn { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.mitem .mi { font-size: 10px; color: var(--muted); font-weight: 500; }

/* Link tài liệu dạng chữ tô màu đơn giản (không đóng khung thành nút) */

/* Danh sách linh kiện dưới các board (tab Sơ đồ chân): thu gọn 3 hàng / mở rộng theo nhóm */
.mods { grid-column: 1 / -1; display: grid; gap: 2px; padding: 6px; margin-top: 6px; border: 1px solid var(--line); border-radius: 12px; background: var(--surface); text-align: left; }
.mods-h { display: flex; align-items: center; gap: 8px; width: 100%; padding: 6px 6px 4px; border: 0; background: none; color: var(--fg); font: 700 13px var(--mono); text-align: left; }
.mods-h span:first-child { flex: 1; }
.mods-n { font: 600 11px var(--mono); color: var(--muted); padding: 1px 6px; border: 1px solid var(--line); border-radius: 6px; }
.mods.open .mods-list { max-height: min(60vh, 560px); overflow-y: auto; scrollbar-width: thin; }
.mods-ch { margin: 6px 4px 2px; font: 700 10.5px var(--mono); color: var(--muted); text-transform: uppercase; letter-spacing: .04em; }
.mod-row { display: flex; align-items: center; gap: 8px; width: 100%; padding: 4px 6px; border: 1px solid transparent; border-radius: 8px; background: none; color: var(--fg); text-align: left; }
.mod-row:hover { border-color: var(--line); background: var(--surface2); }
.mod-row[aria-pressed="true"] { border-color: var(--accent); box-shadow: inset 0 0 0 1px var(--accent); }
.mod-row img { flex: none; width: 38px; height: 28px; object-fit: contain; }
.mr-name { flex: 1; min-width: 0; font: 600 12.5px var(--sans); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.mr-if { flex: none; font: 500 10.5px var(--mono); color: var(--muted); }
.mods-more { margin-top: 2px; padding: 5px; border: 0; border-top: 1px dashed var(--line); background: none; color: var(--accent); font: 600 12px var(--mono); }

/* Tab Connect: tên bố cục / kiểu dây ở góc phải dưới khung vẽ; khung chọn để xoá */
.bstage { position: relative; }
.bname { position: absolute; right: 20px; top: 20px; display: grid; gap: 2px; padding: 6px 10px; border: 1px solid var(--line); border-radius: 8px; background: color-mix(in srgb, var(--surface) 88%, transparent); font: 600 11.5px var(--mono); color: var(--fg); text-align: right; pointer-events: none; }
.bname span { color: var(--muted); font-weight: 500; }
#bsvg .bsel { fill: none; stroke: var(--accent); stroke-width: .35; stroke-dasharray: 1 .6; pointer-events: none; }
#bsvg .bwire.sel { stroke-width: 1.1; filter: drop-shadow(0 0 .6px #fff); }
.bhint { margin: 6px 0 0; }
/* Cột board + linh kiện dài hơn màn hình: cho cuộn riêng thay vì bị kẹt khi dính (sticky) */
@media (min-width: 900px) {
  section[data-panel="pins"] > .boards { max-height: calc(100vh - 88px); overflow-y: auto; scrollbar-width: thin; padding-right: 2px; }
}
/* Cột icon hẹp (900–1399px): hình linh kiện ở trên, tên ở dưới; nhóm chỉ hiện biểu tượng */
@media (min-width: 900px) and (max-width: 1399px) {
  .mods { padding: 4px; }
  .mods-h { flex-wrap: wrap; justify-content: center; gap: 2px 6px; padding: 4px 2px; font-size: 11px; text-align: center; }
  .mods-h span:first-child { flex-basis: 100%; }
  .mods-ch { text-align: center; font-size: 13px; margin: 6px 0 2px; }
  .mods-ch .mc-t { display: none; }
  .mod-row { flex-direction: column; gap: 2px; padding: 4px 2px; text-align: center; }
  .mod-row img { width: 48px; height: 34px; }
  .mr-name { width: 100%; font-size: 10px; white-space: normal; line-height: 1.15; }
  .mr-if { display: none; }
  .mods-more { font-size: 10px; }
}
/* Connect: menu chuột phải, tên 2 đầu dây đang chọn, ảnh nhỏ trong danh sách linh kiện */
.bmenu { position: absolute; z-index: 20; display: grid; min-width: 190px; padding: 4px; border: 1px solid var(--line); border-radius: 10px; background: var(--surface); box-shadow: 0 8px 24px rgba(0,0,0,.35); }
.bmenu button { padding: 8px 12px; border: 0; border-radius: 7px; background: none; color: var(--fg); font: 600 12.5px var(--mono); text-align: left; }
.bmenu button:hover, .bmenu button:focus-visible { background: var(--surface2); outline: none; }
.bwinfo { position: absolute; left: 20px; display: flex; flex-wrap: wrap; align-items: center; gap: 4px 8px; max-width: calc(100% - 40px); padding: 6px 10px; border: 1px solid var(--accent); border-radius: 8px; background: color-mix(in srgb, var(--surface) 90%, transparent); font: 600 12px var(--mono); color: var(--fg); pointer-events: none; }
.bwinfo span { color: var(--muted); }
.mitem img { flex: none; width: 30px; height: 26px; object-fit: contain; }
.mitem { min-height: 38px; }
.mitem .mi { letter-spacing: -.05em; }
.mdrop-body { padding: 6px; }

/* Panel thông tin board: nhãn cột cố định, giá trị căn đều, mỗi dòng một đường kẻ mảnh */
.facts { display: block; margin: 14px 0 0; border-top: 1px solid var(--line); }
.fact { display: grid; grid-template-columns: 8.6em minmax(0, 1fr); gap: 4px 12px; padding: 9px 0; border-bottom: 1px solid var(--line); align-items: baseline; }
.facts dt { font: 600 11.5px var(--mono); color: var(--muted); text-transform: uppercase; letter-spacing: .03em; line-height: 1.5; }
.facts dd { margin: 0; font-size: 14px; line-height: 1.45; overflow-wrap: anywhere; }
.fv { margin: 0; padding: 0; list-style: none; display: grid; gap: 3px; }
.fv li { position: relative; padding-left: 12px; }
.fv li::before { content: ""; position: absolute; left: 0; top: .6em; width: 5px; height: 5px; border-radius: 50%; background: var(--accent); }
.detail .hint { margin: 14px 0 0; }
@media (max-width: 430px) { .fact { grid-template-columns: 1fr; gap: 2px; } }
.fv.two { grid-template-columns: 1fr 1fr; gap: 3px 12px; }
.fv li.fv-note { grid-column: 1 / -1; padding-left: 0; color: var(--muted); font-size: 12.5px; }
.fv li.fv-note::before { display: none; }
.fact:has(.fv.two) { grid-template-columns: 1fr; }
.fv.two li { white-space: nowrap; }
.fv.two { grid-template-columns: repeat(3, auto); justify-content: start; gap: 4px 18px; }
.btitle { font: 700 15px var(--mono); color: var(--fg); padding: 4px 2px; }
.seo-links .buy { font: 600 11px var(--mono); color: var(--muted); text-decoration: none; }
.seo-links .buy:hover { color: var(--accent); }
.seo-links li { line-height: 1.7; }

/* Thẻ "Mua board" ngay dưới khung xem board: ảnh thật (hoặc icon vẽ từ dữ liệu PCB) + link tiếp thị liên kết */
.buy { margin-top: 12px; padding: 14px; }
.buy-h h2 { margin: 0 0 2px; font-size: 17px; }
.buy-h p { margin: 0 0 10px; }
.buy-row { display: grid; grid-auto-flow: column; grid-auto-columns: 182px; gap: 8px; overflow-x: auto; padding-bottom: 6px; scrollbar-width: thin; scroll-snap-type: x proximity; }
.buy-card { display: grid; grid-template-columns: 46px minmax(0, 1fr); grid-template-rows: auto auto; gap: 2px 10px; align-items: center; scroll-snap-align: start;
  padding: 8px 10px; border: 1px solid var(--line); border-radius: 10px; background: var(--surface2); color: var(--fg); text-decoration: none; }
.buy-card:hover { border-color: var(--accent); }
.buy-card.on { border-color: var(--accent); box-shadow: inset 0 0 0 1px var(--accent); }
.buy-pic { grid-row: 1 / 3; width: 46px; height: 46px; display: grid; place-items: center; overflow: hidden; border-radius: 8px; background: var(--canvas); }
.buy-pic img, .buy-pic svg { width: 100%; height: 100%; object-fit: contain; display: block; }
.buy-txt { min-width: 0; display: grid; }
.buy-txt b { font-size: 12.5px; line-height: 1.25; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.buy-txt .small { font-size: 11px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.buy-go { grid-column: 2; justify-self: start; font: 600 11px var(--mono); color: var(--accent); }
@media (max-width: 560px) { .buy-row { grid-auto-columns: 164px; } }

/* Bảng chân ở khối SEO: cuộn trong khung ~6 dòng, tiêu đề cột dính trên */
.seo .tw { max-height: 268px; overflow-y: auto; scrollbar-width: thin; border: 1px solid var(--line); border-radius: 10px; }
.seo .tw table { margin: 0; min-width: 620px; }
.seo .tw td, .seo .tw th { white-space: normal; }
.seo .tw td:nth-child(-n+4) { white-space: nowrap; }
.seo .tw thead th { position: sticky; top: 0; z-index: 1; background: var(--surface2); }

/* Wordmark PINDEXIO: PIN và IO navy, DEX cyan (trên nền đậm thì PIN/IO dùng màu sáng cho đọc được) */
/* Logo đứng trực tiếp trên thanh tiêu đề, không cần nền riêng */
.appbar .brand { gap: 8px; }
.appbar .brand img { width: 60px; height: 60px; }
.brand .wm span { display: inline; font: inherit; color: inherit; }
.brand .wm { display: block; white-space: nowrap; font: 800 23px/1.1 var(--sans); letter-spacing: .03em; }
.brand .wm .wm-n { color: var(--fg); }   /* navy khi nền sáng, sáng màu khi nền tối */
.brand .wm .wm-c { color: #00AEEF; }
.appbar .brand span { color: var(--muted); }

/* Nút chọn vùng mua hàng */
.buy-h { display: flex; flex-wrap: wrap; align-items: baseline; gap: 6px 12px; }
.buy-h h2 { flex: none; }
.buy-shop { display: flex; gap: 4px; }
.buy-shop button { padding: 3px 10px; border: 1px solid var(--line); border-radius: 999px; background: var(--surface2); color: var(--muted); font: 600 11.5px var(--mono); }
.buy-shop button[aria-pressed="true"] { background: var(--accent); border-color: var(--accent); color: var(--accent-fg); }
.buy-h p { flex-basis: 100%; }
.buy-card.off { opacity: .55; cursor: default; }
.buy-card.off .buy-go { color: var(--muted); }

/* Nền tối: dải trắng gắn vào thanh tiêu đề – mép trên, dưới, trái thẳng cứng sát khung;
   chỉ mép phải kéo dài ra thêm và loang mềm vào nền, không bo cong */
.appbar > * { position: relative; z-index: 1; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .appbar::before { content: ""; position: absolute; top: 0; bottom: 0; left: 0; width: 400px; max-width: 78vw; z-index: 0; pointer-events: none;
  background: linear-gradient(90deg, #fff 0, #fff 58%, rgb(255 255 255 / .62) 76%, rgb(255 255 255 / .24) 90%, rgb(255 255 255 / 0) 100%); } }
:root[data-theme="dark"] .appbar::before { content: ""; position: absolute; top: 0; bottom: 0; left: 0; width: 400px; max-width: 78vw; z-index: 0; pointer-events: none;
  background: linear-gradient(90deg, #fff 0, #fff 58%, rgb(255 255 255 / .62) 76%, rgb(255 255 255 / .24) 90%, rgb(255 255 255 / 0) 100%); }
/* chữ trên mảng trắng phải là navy, không theo màu chữ của nền tối */
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .appbar .brand .wm-n { color: #041E42; }
  :root:not([data-theme="light"]) .appbar .brand span { color: #4a6b88; } }
:root[data-theme="dark"] .appbar .brand .wm-n { color: #041E42; }
:root[data-theme="dark"] .appbar .brand span { color: #4a6b88; }
/* Điện thoại: thanh tiêu đề xuống nhiều hàng, dải trắng chỉ phủ hàng có logo */
@media (max-width: 899px) {
  @media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .appbar::before { bottom: auto; height: 76px; } }
  :root[data-theme="dark"] .appbar::before { bottom: auto; height: 76px; }
}

/* Nút "Mua board này" màu cyan dưới tên board (link tiếp thị liên kết) */
/* nút Mua board: nhỏ, chìm, góc phải dưới khung xem board (link tiếp thị của board đang xem) */
.canvas-wrap { position: relative; }
.buy-btn { position: absolute; right: 22px; bottom: 14px; z-index: 2; display: inline-flex; align-items: center; gap: 6px; padding: 5px 12px; border-radius: 999px;
  background: rgba(0, 174, 239, .82); border: 1px solid #00AEEF; color: #fff !important; font: 700 14.4px var(--sans); text-decoration: none;
  box-shadow: 0 2px 8px rgba(0, 0, 0, .25); transition: background .15s; }
.buy-btn:hover { background: #00AEEF; }
.buy-btn:focus-visible { outline: 2px solid #fff; outline-offset: 2px; }
.buy-btn svg { width: 17px; height: 17px; }
/* Nút Wiring trong nhóm PCB / Kiến trúc / Schematic */
.seg .wire-btn { background: #f5d63d !important; color: #1b1f0a !important; font-weight: 800; }
.seg .wire-btn:hover { background: #ffe35a !important; }

/* Trang chủ giới thiệu */
.home-wrap { max-width: 1100px; margin: 0 auto; display: grid; gap: 14px; }
.home-hero { display: flex; flex-wrap: wrap; align-items: center; gap: 18px 26px; padding: 26px; }
.home-hero img { flex: none; width: 96px; height: 96px; }
.home-hero > div { flex: 1 1 300px; min-width: 0; }
.home-wm { margin: 0; font: 800 clamp(30px, 6vw, 46px)/1.05 var(--sans); letter-spacing: .03em; }
.home-wm .wm-n { color: var(--fg); } .home-wm .wm-c { color: #00AEEF; }
.home-lead { margin: 10px 0 16px; max-width: 60ch; font-size: 16.5px; color: var(--muted); }
.home-btns { display: flex; flex-wrap: wrap; gap: 10px; }
.home-go { padding: 10px 18px; border: 1px solid var(--line); border-radius: 10px; background: var(--surface2); color: var(--fg); font: 700 14px var(--sans); cursor: pointer; }
.home-go.primary { background: #00AEEF; border-color: #00AEEF; color: #031a35; }
.home-feats { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 12px; }
.home-feat { display: grid; gap: 4px; padding: 16px; }
.home-feat span { font-size: 22px; } .home-feat b { font-size: 15px; } .home-feat p { margin: 0; color: var(--muted); font-size: 13.5px; }
.home-posts { padding: 16px; }
.home-ptabs { display: flex; gap: 6px; margin-bottom: 12px; border-bottom: 1px solid var(--line); }
.home-ptabs button { padding: 8px 14px; border: 0; border-bottom: 3px solid transparent; background: none; color: var(--muted); font: 700 14px var(--sans); cursor: pointer; }
.home-ptabs button[aria-selected="true"] { color: var(--fg); border-bottom-color: #00AEEF; }
.home-plist { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 12px; }
.home-pcard { display: grid; gap: 6px; padding: 14px; border: 1px solid var(--line); border-radius: 10px; background: var(--surface2); color: var(--fg); text-decoration: none; }
.home-pcard:hover { border-color: #00AEEF; }
.home-pcard b { font-size: 15.5px; line-height: 1.3; } .home-pcard > span:not(.post-meta):not(.home-more) { color: var(--muted); font-size: 13.5px; }
.home-more { color: var(--accent); font: 700 12.5px var(--mono); }
.post-meta { color: var(--muted); font: 600 12px var(--mono); text-transform: uppercase; letter-spacing: .04em; }
.post-view { max-width: 780px; margin: 0 auto; padding: 22px 26px 30px; }
.post-view h1 { margin: 6px 0 8px; font-size: clamp(22px, 4vw, 30px); line-height: 1.2; text-wrap: balance; }
.post-lead { color: var(--muted); font-size: 16px; margin: 0 0 14px; }
.post-back { padding: 6px 12px; border: 1px solid var(--line); border-radius: 8px; background: var(--surface2); color: var(--fg); font-weight: 600; cursor: pointer; margin-bottom: 12px; }
.post-body { font-size: 15.5px; line-height: 1.65; max-width: 68ch; }
.post-body h2, .post-body h3 { margin: 22px 0 8px; line-height: 1.25; } .post-body h3 { font-size: 18px; }
.post-body img { max-width: 100%; height: auto; border-radius: 8px; }
.post-body ul, .post-body ol { padding-left: 22px; } .post-body li { margin: 4px 0; }
.post-body code { font-family: var(--mono); background: var(--surface2); padding: 1px 5px; border-radius: 4px; }
@media (max-width: 560px) { .home-hero { padding: 18px; } .home-hero img { width: 64px; height: 64px; } .post-view { padding: 16px; } }