/* Theme 8-bit: bảng màu PICO-8, khối vuông, bóng đổ cứng, font pixel.
   Press Start 2P chỉ dùng cho chữ ASCII (logo, tên chân, nhãn); VT323 có dấu tiếng Việt cho tiêu đề/nút. */
:root {
  --px: "Press Start 2P", monospace; --vt: "VT323", var(--mono);
  --bg: #fff1e8; --surface: #fffaf5; --surface2: #ffe7d4; --fg: #1d2b53; --muted: #6b5f7a; --line: #1d2b53;
  --accent: #ff004d; --accent-fg: #fff1e8; --hard: #1d2b53;
  --c-power: #ff004d; --c-gnd: #5f574f; --c-gpio: #00b543; --c-adc: #7e57c2; --c-comm: #29adff;
  --c-usb: #ffa300; --c-strap: #ffec27; --c-ban: #a7a1b0; --c-ctl: #83769c;
  --ok: #008751; --warn: #c27c00; --ban: #ff004d; --info: #83769c; --canvas: #ffe7d4;
  --r: 0px; --shadow: 4px 4px 0 var(--hard);
}
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) {
  --bg: #12101f; --surface: #1d1b2e; --surface2: #262340; --fg: #fff1e8; --muted: #a59bbf; --line: #3b3660;
  --accent: #ff004d; --accent-fg: #fff1e8; --hard: #000; --canvas: #0d0b18; --c-gnd: #6b6375; --c-ban: #514a63;
  --ok: #00e436; --warn: #ffa300; --info: #a59bbf; color-scheme: dark; } }
:root[data-theme="dark"] {
  --bg: #12101f; --surface: #1d1b2e; --surface2: #262340; --fg: #fff1e8; --muted: #a59bbf; --line: #3b3660;
  --accent: #ff004d; --accent-fg: #fff1e8; --hard: #000; --canvas: #0d0b18; --c-gnd: #6b6375; --c-ban: #514a63;
  --ok: #00e436; --warn: #ffa300; --info: #a59bbf; color-scheme: dark; }

/* Khối pixel: viền 2px, góc vuông, bóng đổ cứng */
.card, .board-card, .icon-btn, .chip, .stab, .seg, .tabbar, .search, .docs a, .pp, .kv div, .pcard, .out, .f3 input, .f3 select, .oem-img, .status, .warn, .fns span, .badge, .st, .bc-icon {
  border-radius: 0 !important; }
.card { border: 2px solid var(--line); box-shadow: var(--shadow); }
:root[data-theme="dark"] .card, :root:not([data-theme="light"]) .card { }
.board-card, .icon-btn, .chip, .stab, .docs a { border: 2px solid var(--line); box-shadow: 3px 3px 0 var(--hard); transition: transform .06s steps(1), box-shadow .06s steps(1); }
.board-card:active, .icon-btn:active, .chip:active, .stab:active, .docs a:active, .seg button:active, .tabbar button:active { transform: translate(3px, 3px); box-shadow: 0 0 0 var(--hard); }
.board-card:hover, .chip:hover, .stab:hover, .docs a:hover { background: var(--surface2); }
.board-card[aria-pressed="true"] { border-color: var(--accent); box-shadow: 3px 3px 0 var(--accent); }

/* Chữ: pixel cho tiêu đề và nhãn */
.brand b { font: 12px var(--px); letter-spacing: 0; }
.brand span { font: 16px var(--vt); }
.stage-head h1, .spec h2, .card h3, .d-head h2 { font-family: var(--vt); font-weight: 400; letter-spacing: .02em; }
.stage-head h1 { font-size: 30px; line-height: 1; }
.d-head h2 { font-family: var(--px); font-size: 18px; line-height: 1.4; }
.spec h2 { font-size: 26px; } .card h3 { font-size: 22px; }
.tabbar button, .seg button, .stab, .chip { font-family: var(--vt); font-size: 19px; font-weight: 400; line-height: 1; }
.d-sec, .d-kicker, .lg, #count { font-family: var(--vt); font-size: 17px; letter-spacing: .04em; }
.bc-name { font-family: var(--vt); font-size: 18px !important; font-weight: 400 !important; line-height: 1.05 !important; }
.bc-icon b, .dk, .tag, .src, .badge { font-family: var(--px) !important; font-size: 7px !important; font-weight: 400 !important; padding: 3px 4px !important; }
.status { font-family: var(--vt); font-size: 20px; font-weight: 400; border-left-width: 6px; }
.kv b { font-family: var(--vt); font-size: 26px; font-weight: 400; }

/* Thanh trên + tab */
.appbar { border-bottom: 2px solid var(--line); background: var(--surface); backdrop-filter: none; }
.tabbar, .seg { border: 2px solid var(--line); padding: 2px; background: var(--surface2); }
.tabbar button, .seg button { border-radius: 0; padding: 7px 12px; }
.tabbar button[aria-selected="true"], .seg button[aria-pressed="true"], .stab[aria-pressed="true"], .chip[aria-pressed="true"] {
  background: var(--accent); color: var(--accent-fg); border-color: var(--line); box-shadow: inset -3px -3px 0 rgba(0,0,0,.25), inset 3px 3px 0 rgba(255,255,255,.25); }
.search { border: 2px solid var(--line); }
.search input { font-family: var(--vt); font-size: 20px; }

/* Icon board kiểu sprite */
.bc-icon { border: 2px solid var(--line) !important; image-rendering: pixelated; }
.bc-icon b { bottom: -7px; border: 2px solid var(--line); }

/* Khung hình: lưới pixel + scanline nhẹ */
.canvas { border: 2px solid var(--line); border-radius: 0; position: relative;
  background-color: var(--canvas); background-image: linear-gradient(var(--line) 1px, transparent 1px), linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 16px 16px; background-position: -1px -1px; }
:root:not([data-theme="light"]) .canvas { background-image: linear-gradient(rgba(255,255,255,.05) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.05) 1px, transparent 1px); }
.canvas::after { content: ""; position: sticky; display: block; pointer-events: none; }

/* SVG: chữ pixel trên nhãn chân, chân đang chọn nhấp nháy */
#svg .tl { font-family: var(--px); font-size: .95px; }
#svg .alt, #svg .pnum, #svg .buslbl { font-family: var(--vt); font-size: 1.7px; }
#svg .symtitle { font-family: var(--vt); }
#svg .tab { rx: 0; ry: 0; }
#svg .pin.sel .tab { stroke: var(--fg); stroke-width: .4; animation: blink .8s steps(2) infinite; }
#svg .pin.sel .ring { stroke: var(--accent); stroke-width: .5; }
@keyframes blink { 50% { filter: brightness(1.6); } }
#svg.sch .symbox, #svg.sch .mcu { stroke-width: .4; rx: 0; }

/* Panel chi tiết */
.detail { border: 2px solid var(--line); }
.pp { border: 2px solid var(--line); box-shadow: 2px 2px 0 var(--hard); }
.fns span { border: 2px solid var(--line); font-family: var(--vt); font-size: 17px; }
.elec dd { font-family: var(--vt); font-size: 19px; }
.grab { border-radius: 0; background: var(--accent) !important; height: 4px; }
@media (max-width: 899px) { .detail { border-radius: 0; box-shadow: 0 -4px 0 var(--hard); } }

/* Bảng thông số */
.spec th { font-family: var(--vt); font-size: 16px; }
.spec td:nth-child(2), .spec td.num { font-family: var(--vt); font-size: 19px; }
.bar { border-radius: 0; height: 10px; background-image: repeating-linear-gradient(90deg, transparent 0 6px, rgba(0,0,0,.25) 6px 8px); }
.out b { font-family: var(--vt); font-size: 20px; font-weight: 400; color: var(--accent); }

/* Popup ảnh */
.lb-bar .icon-btn { border: 2px solid #fff1e8; box-shadow: 3px 3px 0 #000; }

@media (prefers-reduced-motion: reduce) { #svg .pin.sel .tab { animation: none; } }

/* Panel kiến thức */
.learn-h { font-family: var(--vt) !important; font-size: 28px !important; line-height: 1.05 !important; }
.procon { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.d-sec.ok { color: var(--ok); } .d-sec.bad { color: var(--ban); }
.pinchip { border: 2px solid var(--line); background: var(--surface2); font: 18px var(--vt); padding: 2px 8px; box-shadow: 2px 2px 0 var(--hard); }
.pinchip:active { transform: translate(2px, 2px); box-shadow: none; }
.code { margin: 6px 0 0; padding: 10px 12px; background: #12101f; color: #00e436; border: 2px solid var(--line); font: 18px/1.25 var(--vt); white-space: pre-wrap; overflow-x: auto; }
@media (max-width: 420px) { .procon { grid-template-columns: 1fr; } }

/* Tone xanh ô liu: nền/viền ngả ô liu, ô liu cho trạng thái "đang chọn"; đỏ PICO-8 giữ cho nút chính và cảnh báo */
:root { --olive: #6b7a2a; --olive-hi: #a3b44a; --olive-fg: #f6f4e4;
  --bg: #f3f1e0; --surface: #fbfaf0; --surface2: #e7e8c9; --canvas: #e4e6c4; --line: #2f3518; --hard: #2f3518; --fg: #232812; --muted: #616944; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) {
  --olive: #8d9c3a; --olive-hi: #b9cb5a; --olive-fg: #141808;
  --bg: #121509; --surface: #1b2010; --surface2: #262c16; --canvas: #0e1107; --line: #3d4622; --hard: #000; --fg: #eef0d8; --muted: #a6ad85; } }
:root[data-theme="dark"] { --olive: #8d9c3a; --olive-hi: #b9cb5a; --olive-fg: #141808;
  --bg: #121509; --surface: #1b2010; --surface2: #262c16; --canvas: #0e1107; --line: #3d4622; --hard: #000; --fg: #eef0d8; --muted: #a6ad85; }

.board-card[aria-pressed="true"] { border-color: var(--olive); box-shadow: 3px 3px 0 var(--olive); background: color-mix(in srgb, var(--olive) 14%, var(--surface)); }
.board-card[aria-pressed="true"] .bc-icon { box-shadow: 0 0 0 2px var(--olive); }
.seg button[aria-pressed="true"], .stab[aria-pressed="true"], .chip[aria-pressed="true"] { background: var(--olive); color: var(--olive-fg); }
.appbar { background: var(--surface); box-shadow: 0 3px 0 color-mix(in srgb, var(--olive) 45%, transparent); }
.brand img { image-rendering: pixelated; }
.d-sec, .d-kicker { color: var(--olive-hi); }
:root[data-theme="light"] .d-sec, :root[data-theme="light"] .d-kicker { color: var(--olive); }
@media (prefers-color-scheme: light) { :root:not([data-theme="dark"]) .d-sec, :root:not([data-theme="dark"]) .d-kicker { color: var(--olive); } }
.pinchip:hover, .docs a:hover, .board-card:hover { background: color-mix(in srgb, var(--olive) 18%, var(--surface)); }
.dk, .tag.hdg { background: var(--olive) !important; color: var(--olive-fg) !important; }
.code { background: #0e1107; color: var(--olive-hi); }
.grab { background: var(--olive) !important; }
#svg .pin.sel .ring { stroke: var(--olive-hi); }
.kv div, .pp { border-left: 6px solid var(--olive); }

/* Ô liu đậm làm màu chủ đạo (thay đỏ cho tab chính); đỏ chỉ còn cho cảnh báo */
:root { --olive: #4b5a14; --olive-hi: #8fa42e; --olive-fg: #f4f2dc; --accent: #4b5a14; --accent-fg: #f4f2dc;
  --bg: #e9ead0; --surface: #f6f5e6; --surface2: #dcdfb4; --canvas: #d6daa8; --line: #2a3110; --hard: #2a3110; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) {
  --olive: #556b2f; --olive-hi: #a8bf3f; --accent: #6b8023; --accent-fg: #f4f2dc;
  --bg: #0f1306; --surface: #1a210b; --surface2: #263012; --canvas: #0b0e04; --line: #3f4d18; } }
:root[data-theme="dark"] { --olive: #556b2f; --olive-hi: #a8bf3f; --accent: #6b8023; --accent-fg: #f4f2dc;
  --bg: #0f1306; --surface: #1a210b; --surface2: #263012; --canvas: #0b0e04; --line: #3f4d18; }
.appbar { background: var(--olive); border-bottom-color: #000; box-shadow: 0 3px 0 #000; }
.appbar .brand b, .appbar .brand span { color: var(--olive-fg); }
.appbar .tabbar { background: rgba(0,0,0,.25); border-color: #000; }
.appbar .tabbar button { color: #dfe4b8; }
.appbar .tabbar button[aria-selected="true"] { background: #f4f2dc; color: #2a3110; }
.appbar .icon-btn { background: rgba(0,0,0,.25); border-color: #000; color: var(--olive-fg); }
.card { border-color: var(--olive); }
.stage-head, .spec h2 { color: var(--fg); }
.canvas { border-color: var(--olive); }
.daynight { border: 2px solid #000; border-radius: 0; background: rgba(0,0,0,.25); }
.daynight button { color: #dfe4b8; font-family: "Segoe UI Symbol", system-ui, sans-serif; font-size: 18px; }
.daynight button[aria-pressed="true"] { background: #f4f2dc; color: #2a3110; }
.appbar .skin { border-radius: 0; border: 2px solid #000; background: rgba(0,0,0,.25); color: #f4f2dc; font: 18px var(--vt); }
.appbar .skin option { color: #000; }

/* 8-bit tông "đại dương retro": xanh biển sâu, cam san hô, vàng tiêu đề, xanh ngọc bọt nước */
:root { --olive: #1f6f7a; --olive-hi: #7fd1c4; --olive-fg: #fff6dc; --accent: #e8672a; --accent-fg: #fff6dc;
  --bg: #e6f2ee; --surface: #f6fbf8; --surface2: #cfe7e2; --canvas: #d7ece8; --line: #0d2f3a; --hard: #0d2f3a; --fg: #0d2f3a; --muted: #3f6670;
  --c-gpio: #2fa37c; --c-strap: #f5d63d; --c-usb: #f28b3c; --c-power: #e2442f; --c-comm: #2f8fd6; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) {
  --olive: #1f6f7a; --olive-hi: #7fd1c4; --accent: #e8672a;
  --bg: #071c24; --surface: #0d2c37; --surface2: #133a47; --canvas: #062029; --line: #1f5563; --hard: #000; --fg: #e9f6f1; --muted: #8fb7bb; } }
:root[data-theme="dark"] { --olive: #1f6f7a; --olive-hi: #7fd1c4; --accent: #e8672a;
  --bg: #071c24; --surface: #0d2c37; --surface2: #133a47; --canvas: #062029; --line: #1f5563; --hard: #000; --fg: #e9f6f1; --muted: #8fb7bb; }
.appbar { background: linear-gradient(180deg, #0f4a59, #0b3542); }
.brand b { color: #f5d63d; text-shadow: 2px 2px 0 #000; }
.appbar .tabbar button[aria-selected="true"], .daynight button[aria-pressed="true"] { background: #f5d63d; color: #0d2f3a; }
.stage-head h1, .spec h2, .d-head h2 { color: #f5d63d; text-shadow: 2px 2px 0 rgba(0,0,0,.45); }
:root[data-theme="light"] .stage-head h1, :root[data-theme="light"] .spec h2, :root[data-theme="light"] .d-head h2 { color: #c4511e; text-shadow: none; }
.seg button[aria-pressed="true"], .stab[aria-pressed="true"], .chip[aria-pressed="true"] { background: var(--accent); color: var(--accent-fg); }
.board-card[aria-pressed="true"] { border-color: #e8672a; box-shadow: 3px 3px 0 #e8672a; }
.code { background: #04161c; color: #7fd1c4; }

/* 8-bit chế độ sáng: vàng kem đậm (bớt chói) */
:root, :root[data-theme="light"] {
  --bg: #e9d9a6; --surface: #f3e6bb; --surface2: #e0cb8b; --canvas: #e6d39b; --muted: #5a4f2e; --line: #0d2f3a; --fg: #1b2a2e; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) { --bg: #071c24; --surface: #0d2c37; --surface2: #133a47; --canvas: #062029; --muted: #8fb7bb; --line: #1f5563; --fg: #e9f6f1; } }
:root[data-theme="dark"] { --bg: #071c24; --surface: #0d2c37; --surface2: #133a47; --canvas: #062029; --muted: #8fb7bb; --line: #1f5563; --fg: #e9f6f1; }