/* UVM Trainer: dark "waveform viewer" look by default, light theme available. */
:root {
  --bg: #0b1016; --bg2: #0f1620; --panel: #131c27; --panel2: #18232f; --line: #243241; --line2: #2f4053;
  --ink: #e4ecf3; --mute: #8a9bab; --acc: #2dd4bf; --acc-ink: #04201c; --acc2: #60a5fa; --warn: #fbbf24;
  --ok: #34d399; --ok-bg: rgba(52, 211, 153, .12); --bad: #f87171; --bad-bg: rgba(248, 113, 113, .12);
  --code-bg: #0a0f15; --k: #c084fc; --s: #fca5a5; --c: #64748b; --m: #fbbf24; --u: #5eead4;
  --shadow: 0 10px 30px rgba(0, 0, 0, .35); --r: 12px;
  --sans: Inter, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, "Cascadia Code", Consolas, monospace;
  color-scheme: dark;
}
@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    --bg: #f4f6f8; --bg2: #eef1f4; --panel: #ffffff; --panel2: #f6f8fa; --line: #dde3ea; --line2: #c9d2dc;
    --ink: #17202a; --mute: #5e6b78; --acc: #0d9488; --acc-ink: #ffffff; --acc2: #2563eb; --warn: #b45309;
    --ok: #059669; --ok-bg: rgba(5, 150, 105, .1); --bad: #dc2626; --bad-bg: rgba(220, 38, 38, .08);
    --code-bg: #f7f9fb; --k: #7c3aed; --s: #b91c1c; --c: #94a3b8; --m: #b45309; --u: #0f766e;
    --shadow: 0 8px 24px rgba(15, 23, 42, .08); color-scheme: light;
  }
}
:root[data-theme="light"] {
  --bg: #f4f6f8; --bg2: #eef1f4; --panel: #ffffff; --panel2: #f6f8fa; --line: #dde3ea; --line2: #c9d2dc;
  --ink: #17202a; --mute: #5e6b78; --acc: #0d9488; --acc-ink: #ffffff; --acc2: #2563eb; --warn: #b45309;
  --ok: #059669; --ok-bg: rgba(5, 150, 105, .1); --bad: #dc2626; --bad-bg: rgba(220, 38, 38, .08);
  --code-bg: #f7f9fb; --k: #7c3aed; --s: #b91c1c; --c: #94a3b8; --m: #b45309; --u: #0f766e;
  --shadow: 0 8px 24px rgba(15, 23, 42, .08); color-scheme: light;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html, body { margin: 0; }
body { background: var(--bg); color: var(--ink); font: 15px/1.55 var(--sans); min-height: 100vh; -webkit-tap-highlight-color: transparent; }
a { color: var(--acc); text-decoration: none; }
code, .mono { font-family: var(--mono); }
code { font-size: .88em; background: var(--panel2); border: 1px solid var(--line); border-radius: 5px; padding: .05em .35em; }
h1, h2 { line-height: 1.2; letter-spacing: -.01em; }
.mute { color: var(--mute); } .small { font-size: .85em; } .dim { opacity: .25; }
.row { display: flex; gap: .6rem; flex-wrap: wrap; align-items: center; margin-top: 1rem; }
.row.center { justify-content: center; } .row.spread { justify-content: space-between; margin-top: 2rem; }

/* ---------- header */
.top { position: sticky; top: 0; z-index: 20; display: flex; align-items: center; gap: 1rem; padding: .7rem 16px;
  background: color-mix(in srgb, var(--bg) 88%, transparent); backdrop-filter: blur(8px); border-bottom: 1px solid var(--line); }
.brand { display: flex; align-items: center; gap: .55rem; color: var(--ink); font-family: var(--mono); font-size: 1.05rem; }
.brand b { color: var(--acc); }
.logo { width: 26px; height: 26px; border-radius: 7px; background: var(--acc);
  -webkit-mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 32 32'%3E%3Crect width='32' height='32' rx='7'/%3E%3C/svg%3E");
  position: relative; }
.logo::after { content: ""; position: absolute; inset: 0; background: linear-gradient(transparent 45%, var(--acc-ink) 45% 55%, transparent 55%); opacity: .5; }
.rank { margin-left: auto; display: flex; align-items: center; gap: .6rem; font-size: .85rem; }
.rank-name { font-weight: 600; } .xp { font-family: var(--mono); color: var(--mute); }
.xpbar { width: 110px; height: 7px; border-radius: 9px; background: var(--panel2); border: 1px solid var(--line); overflow: hidden; }
.xpbar i { display: block; height: 100%; background: linear-gradient(90deg, var(--acc), var(--acc2)); }
.icon-btn { background: none; border: 1px solid var(--line); color: var(--ink); border-radius: 8px; width: 34px; height: 34px; cursor: pointer; font-size: 1rem; }

main { max-width: 1000px; margin: 0 auto; padding: 16px 16px 120px; }

/* ---------- buttons */
.btn { font: 600 .92rem var(--sans); color: var(--ink); background: var(--panel2); border: 1px solid var(--line2);
  border-radius: 10px; padding: .6rem 1rem; cursor: pointer; display: inline-flex; align-items: center; gap: .4rem; transition: transform .08s, background .15s; }
.btn:hover:not(:disabled) { background: var(--panel); border-color: var(--acc); }
.btn:active:not(:disabled) { transform: translateY(1px); }
.btn:disabled { opacity: .4; cursor: not-allowed; }
.btn.primary { background: var(--acc); color: var(--acc-ink); border-color: var(--acc); }
.btn.primary:hover:not(:disabled) { filter: brightness(1.08); background: var(--acc); }
.btn.good { border-color: color-mix(in srgb, var(--ok) 60%, var(--line)); } .btn.bad { border-color: color-mix(in srgb, var(--bad) 60%, var(--line)); }
.btn.big { padding: .9rem 1.6rem; font-size: 1rem; min-width: 150px; justify-content: center; }
.btn.ghost { background: transparent; } .btn.small { padding: .3rem .6rem; font-size: .8rem; margin-top: .5rem; }
.btn.danger:hover { border-color: var(--bad); color: var(--bad); }
.pill { display: inline-block; font: 600 .72rem var(--mono); text-transform: uppercase; letter-spacing: .04em; color: var(--acc);
  border: 1px solid color-mix(in srgb, var(--acc) 45%, transparent); border-radius: 99px; padding: .1rem .5rem; margin-left: .3rem; vertical-align: middle; }

/* ---------- map */
.hero { padding: 1.2rem 0 1.4rem; }
.hero h1 { font-size: clamp(1.6rem, 4.5vw, 2.4rem); margin: .3rem 0 .6rem; max-width: 22ch; }
.hero p { color: var(--mute); max-width: 68ch; margin: 0; }
.hero-stats { display: flex; gap: 1.2rem; margin-top: 1rem; color: var(--acc); font-size: .9rem; flex-wrap: wrap; }
.rank { cursor: pointer; }
.ladder { background: var(--panel); border: 1px solid var(--line); border-radius: var(--r); padding: .9rem 1.1rem .6rem; margin-bottom: 1.2rem; }
.ladder h2 { font-size: 1rem; margin: 0 0 .7rem; }
.ladder ol { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(6, 1fr); gap: 8px; }
.ld-step { position: relative; display: flex; flex-direction: column; gap: .2rem; padding: .7rem .7rem .6rem; border-radius: 10px;
  background: var(--panel2); border: 1px solid var(--line); }
.ld-dot { width: 1.7rem; height: 1.7rem; border-radius: 50%; display: grid; place-items: center; font: 700 .8rem var(--mono);
  background: var(--bg2); border: 1px solid var(--line2); color: var(--mute); }
.ld-name { font-weight: 700; font-size: .9rem; } .ld-name small { display: block; font-weight: 600; font-size: .7rem; color: var(--acc); }
.ld-need { font-size: .72rem; color: var(--mute); }
.ld-step.done .ld-dot { background: var(--ok-bg); border-color: var(--ok); color: var(--ok); }
.ld-step.cur { border-color: var(--acc); } .ld-step.cur .ld-dot { background: var(--acc); border-color: var(--acc); color: var(--acc-ink); }
.ld-step.next { border-style: dashed; border-color: var(--line2); }
.ld-step.locked { opacity: .55; }
.ld-meters { display: flex; flex-direction: column; gap: .25rem; margin-top: .3rem; font-size: .7rem; color: var(--mute); }
.ld-req { display: flex; flex-direction: column; gap: .15rem; } .ld-req.met { color: var(--ok); }
.ld-bar { height: 4px; border-radius: 4px; background: var(--bg2); overflow: hidden; }
.ld-bar i { display: block; height: 100%; background: linear-gradient(90deg, var(--acc), var(--acc2)); }
.ld-req.met .ld-bar i { background: var(--ok); }
@media (max-width: 900px) { .ladder ol { grid-template-columns: repeat(3, 1fr); } }
@media (max-width: 520px) { .ladder ol { grid-template-columns: repeat(2, 1fr); } }
.map { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 12px; }
.ch-card { position: relative; display: flex; flex-direction: column; gap: .25rem; padding: 1rem 1rem .9rem; color: var(--ink);
  background: var(--panel); border: 1px solid var(--line); border-radius: var(--r); transition: transform .12s, border-color .12s; min-height: 170px; }
.ch-card:hover { transform: translateY(-2px); border-color: var(--acc); }
.ch-card.done { border-color: color-mix(in srgb, var(--ok) 55%, var(--line)); }
.ch-num { font-size: .8rem; color: var(--acc); font-weight: 700; }
.ch-num.big { font-size: 2.2rem; line-height: 1; }
.ch-title { font-weight: 700; font-size: 1.02rem; }
.ch-blurb { color: var(--mute); font-size: .84rem; flex: 1; }
.ch-meta { font-size: .72rem; color: var(--mute); }
.ch-prog { height: 4px; background: var(--panel2); border-radius: 4px; overflow: hidden; margin-top: .3rem; }
.ch-prog i { display: block; height: 100%; background: var(--acc); }
.ch-stars { position: absolute; top: .85rem; right: .9rem; font: 600 .78rem var(--mono); color: var(--warn); }
.stars { color: var(--warn); letter-spacing: .05em; white-space: nowrap; }
.stars.small { font-size: .8rem; } .stars.big { font-size: 2.6rem; }
.foot { margin-top: 2.5rem; padding-top: 1rem; border-top: 1px solid var(--line); display: flex; flex-wrap: wrap; gap: .5rem; align-items: center; }
.foot p { width: 100%; margin: .3rem 0 0; }

/* ---------- chapter */
.back { display: inline-block; margin-bottom: .8rem; font-size: .9rem; }
.ch-head { display: flex; gap: 1rem; align-items: center; margin-bottom: 1rem; }
.ch-head h1 { margin: 0; font-size: clamp(1.4rem, 4vw, 2rem); }
.ch-head p { margin: .2rem 0 0; }
.intel { background: var(--panel); border: 1px solid var(--line); border-radius: var(--r); padding: .2rem 1.1rem; margin-bottom: 1.2rem; }
.intel summary { cursor: pointer; font-weight: 700; padding: .7rem 0; }
.intel ul { margin: 0 0 1rem; padding-left: 1.2rem; } .intel li { margin: .45rem 0; }
.missions { display: grid; gap: 10px; }
.mission { display: flex; align-items: center; gap: 1rem; padding: .9rem 1rem; background: var(--panel); border: 1px solid var(--line);
  border-radius: var(--r); color: var(--ink); transition: border-color .12s, transform .12s; }
.mission:hover { border-color: var(--acc); transform: translateX(2px); }
.m-idx { width: 2rem; height: 2rem; border-radius: 50%; display: grid; place-items: center; background: var(--panel2); border: 1px solid var(--line2); color: var(--acc); font-weight: 700; flex: none; }
.m-body { flex: 1; display: flex; flex-direction: column; min-width: 0; }
.eng { font: 600 .7rem var(--mono); text-transform: uppercase; letter-spacing: .06em; color: var(--acc); }
.m-title { font-weight: 700; } .m-desc { color: var(--mute); font-size: .88rem; }
.m-score { display: flex; flex-direction: column; align-items: flex-end; gap: .1rem; flex: none; }

/* ---------- play shell */
.hud { display: flex; align-items: center; gap: 1rem; flex-wrap: wrap; padding-bottom: .8rem; border-bottom: 1px solid var(--line); margin-bottom: 1rem; }
.hud .back { margin: 0; }
.hud-title { flex: 1; font-weight: 700; display: flex; flex-direction: column; min-width: 180px; }
.hud-stats { position: relative; display: flex; gap: .9rem; align-items: center; font: 600 .9rem var(--mono); }
.hud-xp { color: var(--acc); } .streak { color: var(--warn); }
.floater { position: absolute; right: 0; top: -4px; color: var(--ok); font: 700 .95rem var(--mono); animation: floatup .9s ease-out forwards; pointer-events: none; }
@keyframes floatup { to { transform: translateY(-26px); opacity: 0; } }
.how { color: var(--mute); margin: 0 0 1rem; font-size: .92rem; }
.stage { min-height: 300px; }
.prompt { font-weight: 600; font-size: 1.02rem; margin: .4rem 0 .9rem; }
.prompt.small { font-size: .88rem; font-weight: 500; color: var(--mute); margin: .6rem 0 0; }
.setup { margin: 0 0 .6rem; }
.panel { background: var(--panel); border: 1px solid var(--line); border-radius: var(--r); padding: .8rem .9rem; margin-bottom: .8rem; }
.panel.ask { border-color: var(--acc); box-shadow: 0 0 0 3px color-mix(in srgb, var(--acc) 15%, transparent); }
.panel-h { font: 600 .74rem var(--mono); text-transform: uppercase; letter-spacing: .05em; color: var(--mute); margin-bottom: .55rem; }

/* feedback dock */
.fb { position: sticky; bottom: 12px; z-index: 15; margin-top: 1rem; display: flex; gap: 1rem; align-items: center; justify-content: space-between;
  padding: .9rem 1rem; border-radius: var(--r); background: var(--panel); border: 1px solid var(--line2); box-shadow: var(--shadow); animation: rise .18s ease-out; }
.fb.good { border-color: var(--ok); background: color-mix(in srgb, var(--ok) 8%, var(--panel)); }
.fb.bad { border-color: var(--bad); background: color-mix(in srgb, var(--bad) 7%, var(--panel)); }
.fb-head { margin-right: .2rem; } .fb.good .fb-head { color: var(--ok); } .fb.bad .fb-head { color: var(--bad); }
.fb-body { flex: 1; min-width: 0; font-size: .93rem; } .fb .btn { flex: none; }
@media (max-width: 640px) { .fb { flex-direction: column; align-items: stretch; } }
@keyframes rise { from { transform: translateY(8px); opacity: 0; } }
.toast { position: fixed; left: 50%; bottom: 22px; transform: translate(-50%, 30px); opacity: 0; z-index: 50; max-width: min(92vw, 640px);
  background: var(--panel); border: 1px solid var(--line2); border-left: 4px solid var(--acc); border-radius: 10px; padding: .7rem 1rem; box-shadow: var(--shadow);
  font-size: .9rem; transition: all .2s; pointer-events: none; }
.toast.show { opacity: 1; transform: translate(-50%, 0); }
.toast.bad { border-left-color: var(--bad); } .toast.good { border-left-color: var(--ok); }
.trace { margin: .4rem 0 .2rem; padding-left: 1.2rem; } .trace li { margin: .2rem 0; }
ol.mini { margin: .3rem 0 .6rem; padding-left: 1.3rem; font-size: .9rem; }

/* code */
pre.code { margin: 0; background: var(--code-bg); border: 1px solid var(--line); border-radius: 9px; padding: .7rem .85rem; overflow-x: auto;
  font: 13px/1.55 var(--mono); white-space: pre; }
pre.code.small { font-size: 12px; }
.code .k { color: var(--k); } .code .s { color: var(--s); } .code .c { color: var(--c); font-style: italic; } .code .m { color: var(--m); } .code .u { color: var(--u); }

/* results */
.results { text-align: center; padding: 2rem 1rem; background: var(--panel); border: 1px solid var(--line); border-radius: var(--r); }
.results h2 { margin: .4rem 0; } .promo { color: var(--warn); font-weight: 700; }

/* shared choice buttons */
.opts { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: .55rem; }
.opt, .bin, .tile, .cls, .qchip, .chip, .node, .pin, .ln { font: inherit; color: var(--ink); cursor: pointer; }
.opt { text-align: left; padding: .8rem 1rem; background: var(--panel); border: 1px solid var(--line2); border-radius: 10px; transition: border-color .12s, background .12s; }
.opt:hover:not(:disabled) { border-color: var(--acc); }
.right { border-color: var(--ok) !important; background: var(--ok-bg) !important; }
.wrong { border-color: var(--bad) !important; background: var(--bad-bg) !important; }
.num { font: 700 .75rem var(--mono); color: var(--acc); margin-right: .3rem; }
.shake { animation: shake .35s; }
@keyframes shake { 20%, 60% { transform: translateX(-5px); } 40%, 80% { transform: translateX(5px); } }

/* sort */
.deck { display: flex; flex-direction: column; gap: 1.2rem; }
.card-stack { position: relative; margin: 0 auto; width: min(560px, 100%); }
.sort-card { position: relative; z-index: 2; min-height: 130px; display: grid; place-items: center; text-align: center; padding: 1.4rem;
  background: var(--panel); border: 1px solid var(--line2); border-radius: 16px; box-shadow: var(--shadow); font-size: 1.05rem; font-weight: 500; animation: deal .22s ease-out; }
.sort-card.is-code { text-align: left; place-items: stretch; padding: .8rem; }
.ghost-card { position: absolute; inset: 8px -6px -8px 6px; background: var(--panel2); border: 1px solid var(--line); border-radius: 16px; z-index: 1; }
@keyframes deal { from { transform: translateY(-14px) rotate(-1.5deg); opacity: 0; } }
.flash-good { border-color: var(--ok); } .flash-bad { border-color: var(--bad); }
.bins { display: grid; gap: .6rem; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); }
.bin { padding: 1rem .8rem; background: var(--panel2); border: 2px dashed var(--line2); border-radius: 12px; display: flex; flex-direction: column; gap: .2rem; text-align: center; }
.bin:hover:not(:disabled) { border-color: var(--acc); border-style: solid; }
.bin small { color: var(--mute); font-size: .78rem; }

/* order */
.slots { list-style: none; padding: 0; margin: 1rem 0 0; display: grid; gap: .4rem; counter-reset: s; }
.slots li { counter-increment: s; display: flex; align-items: center; gap: .6rem; min-height: 44px; }
.slots li::before { content: counter(s); font: 700 .8rem var(--mono); color: var(--mute); width: 1.6rem; text-align: right; flex: none; }
.slots li.empty::after { content: ""; flex: 1; height: 30px; border: 1px dashed var(--line2); border-radius: 9px; }
.slots li.ok .chip { border-color: var(--ok); background: var(--ok-bg); } .slots li.no .chip { border-color: var(--bad); background: var(--bad-bg); }
.pool { display: flex; flex-wrap: wrap; gap: .5rem; padding: .8rem; background: var(--bg2); border: 1px solid var(--line); border-radius: var(--r); }
.chip { text-align: left; padding: .55rem .8rem; background: var(--panel); border: 1px solid var(--line2); border-radius: 9px; font-size: .92rem; }
.slots .chip { flex: 1; }
.chip:hover { border-color: var(--acc); }
.lane { font: 700 .66rem var(--mono); padding: .1rem .35rem; border-radius: 5px; margin-right: .45rem; background: var(--acc2); color: #fff; }
.lane-SEQ { background: #7c3aed; } .lane-DRV { background: #0891b2; } .lane-SQR { background: #b45309; } .lane-TB { background: #475569; }

/* bughunt */
.code.lines { display: flex; flex-direction: column; padding: .4rem 0; background: var(--code-bg); border: 1px solid var(--line); border-radius: 9px; overflow-x: auto; }
.ln { display: flex; text-align: left; background: none; border: 0; border-left: 3px solid transparent; padding: .1rem .7rem .1rem 0; font: 13px/1.6 var(--mono); white-space: pre; }
.ln:hover:not(:disabled) { background: var(--panel2); }
.ln .no { width: 2.6rem; text-align: right; padding-right: .8rem; color: var(--c); flex: none; user-select: none; }
.ln.sel { background: color-mix(in srgb, var(--warn) 16%, transparent); border-left-color: var(--warn); }
.ln.culprit { background: var(--bad-bg); border-left-color: var(--bad); } .ln.miss { background: color-mix(in srgb, var(--warn) 10%, transparent); text-decoration: line-through; }
.ln:disabled { cursor: default; }

/* match */
.match { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.4fr); gap: .8rem; }
.col { display: flex; flex-direction: column; gap: .45rem; }
.col-h { font: 600 .74rem var(--mono); text-transform: uppercase; color: var(--mute); }
.tile { text-align: left; padding: .65rem .8rem; background: var(--panel); border: 1px solid var(--line2); border-radius: 9px; font-size: .9rem; min-height: 46px; transition: opacity .2s; }
.tile.sel { border-color: var(--acc); box-shadow: 0 0 0 3px color-mix(in srgb, var(--acc) 22%, transparent); }
.tile.done { opacity: .35; border-color: var(--ok); cursor: default; }
.tile.mono { font-family: var(--mono); font-size: .84rem; }

/* tree / phase walker */
.tree { display: flex; flex-direction: column; gap: .3rem; }
.node { display: flex; align-items: center; gap: .6rem; margin-left: calc(var(--d) * 1.6rem); padding: .5rem .8rem; background: var(--panel); border: 1px solid var(--line2);
  border-radius: 9px; text-align: left; width: fit-content; min-width: 200px; position: relative; }
.node::before { content: ""; position: absolute; left: -1rem; top: 50%; width: .8rem; border-top: 1px solid var(--line2); display: var(--stem, block); }
.node[style*="--d:0"]::before { display: none; }
.node .badge { width: 1.5rem; height: 1.5rem; border-radius: 50%; border: 1px dashed var(--line2); display: grid; place-items: center; font: 700 .75rem var(--mono); flex: none; }
.node.visited { border-color: var(--acc); } .node.visited .badge { background: var(--acc); color: var(--acc-ink); border-style: solid; }
.node.static { cursor: default; min-width: 170px; padding: .3rem .7rem; }
.tree.small .node { font-size: .85rem; margin-left: calc(var(--d) * 1.1rem); }
.node.getter { border-color: var(--acc2); box-shadow: 0 0 0 2px color-mix(in srgb, var(--acc2) 30%, transparent); }
.tags { display: flex; gap: .2rem; margin-left: auto; }
.tag { font: 700 .66rem var(--mono); font-style: normal; padding: 0 .3rem; border-radius: 4px; color: #fff; }
.tag.t0 { background: #7c3aed; } .tag.t1 { background: #0891b2; } .tag.t2 { background: #b45309; } .tag.t3 { background: #be185d; }

/* factory */
.cls-tree { display: flex; flex-direction: column; gap: .35rem; }
.cls { margin-left: calc(var(--d) * 1.6rem); display: flex; gap: .7rem; align-items: baseline; padding: .6rem .9rem; width: fit-content; min-width: 240px;
  background: var(--panel); border: 1px solid var(--line2); border-radius: 9px; }
.cls:hover:not(:disabled) { border-color: var(--acc); } .cls small { color: var(--mute); font-size: .75rem; }

/* config db */
.cdb-grid { display: grid; grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr); gap: .8rem; }
@media (max-width: 760px) { .cdb-grid { grid-template-columns: 1fr; } }
.setrow { display: flex; gap: .3rem; align-items: flex-start; margin-bottom: .45rem; } .setrow pre { flex: 1; font-size: 12px; }
.cdb .opts { grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); }

/* objections */
.timeline { display: flex; flex-direction: column; gap: 1.2rem; padding-top: 1rem; }
.tl-row { display: grid; grid-template-columns: minmax(110px, 210px) 1fr; gap: .7rem; align-items: center; }
.tl-lab { font-size: .75rem; color: var(--mute); overflow: hidden; text-overflow: ellipsis; }
.tl-track { position: relative; height: 26px; background: var(--bg2); border-radius: 6px; border: 1px solid var(--line); }
.tl-bar { position: absolute; top: 3px; bottom: 3px; background: var(--acc); border-radius: 4px; display: block; }
.tl-bar.np { background: repeating-linear-gradient(45deg, var(--warn), var(--warn) 6px, transparent 6px, transparent 11px); border: 1px solid var(--warn); }
.tl-bar em { position: absolute; top: -17px; left: -4px; font: 600 .68rem var(--mono); font-style: normal; color: var(--mute); }
.tl-bar em.r { left: auto; right: -6px; }
.tl-row.axis .tl-track { background: none; border: 0; border-top: 1px solid var(--line2); border-radius: 0; height: 18px; }
.tl-row.axis b { position: absolute; transform: translateX(-50%); font: 500 .68rem var(--mono); color: var(--mute); top: 2px; }
.legend { display: flex; gap: 1rem; flex-wrap: wrap; color: var(--mute); margin-top: .7rem; align-items: center; }
.legend .tl-bar { position: relative; display: inline-block; width: 26px; height: 10px; top: 1px; margin-right: .3rem; }
.scrub input { width: 100%; accent-color: var(--acc); }
.counts { display: flex; flex-wrap: wrap; gap: .3rem .9rem; font-size: .8rem; margin-top: .4rem; color: var(--mute); }
.counts .hot { color: var(--acc); font-weight: 700; }

/* arbiter */
.seqs { display: flex; flex-wrap: wrap; gap: .5rem; }
.seqtag { display: flex; flex-direction: column; padding: .4rem .7rem; border: 1px solid var(--line2); border-radius: 9px; font: 600 .85rem var(--mono); background: var(--panel2); }
.seqtag small { font: 500 .72rem var(--sans); color: var(--mute); }
.seqtag.grab, .seqtag.lock { border-color: var(--warn); }
.lanes { display: grid; gap: .8rem; }
.lane-box { background: var(--panel); border: 1px solid var(--line); border-radius: var(--r); padding: .8rem .9rem; }
.granted, .queue { display: flex; flex-wrap: wrap; gap: .45rem; min-height: 40px; align-items: center; }
.qchip, .gchip { --c: hsl(calc(var(--h) * 70 + 170) 65% 55%); }
.qchip { display: flex; flex-direction: column; align-items: flex-start; padding: .55rem .8rem; border-radius: 10px; border: 2px solid var(--c);
  background: color-mix(in srgb, var(--c) 14%, var(--panel)); font: 700 .88rem var(--mono); }
.qchip small { font: 500 .7rem var(--sans); color: var(--mute); }
.qchip:hover { transform: translateY(-2px); }
.gchip { font: 600 .78rem var(--mono); padding: .25rem .5rem; border-radius: 6px; background: color-mix(in srgb, var(--c) 22%, var(--panel)); border: 1px solid var(--c); }

/* verbosity */
.transcript { font: 12.5px/1.7 var(--mono); max-height: 360px; overflow-y: auto; }
.logl { padding: .1rem .3rem; border-radius: 4px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.logl.gone { opacity: .35; text-decoration: line-through; }
.logl.pending { background: color-mix(in srgb, var(--acc) 12%, transparent); outline: 1px dashed var(--acc); white-space: normal; }
.sev { font-weight: 700; } .sev.UVM_INFO { color: var(--acc2); } .sev.UVM_WARNING { color: var(--warn); } .sev.UVM_ERROR { color: var(--bad); }
.vtag { color: var(--warn); font-weight: 700; }

/* register bench */
.regt { border-collapse: separate; border-spacing: 4px 4px; width: 100%; font-size: .85rem; }
.regt th { text-align: left; font: 600 .75rem var(--mono); color: var(--mute); white-space: nowrap; }
.regt th small { display: block; font-weight: 500; font-size: .66rem; }
.regt td { text-align: center; }
.fcell { background: var(--bg2); border: 1px solid var(--line); border-radius: 7px; padding: .25rem; white-space: nowrap; }
.fcell.RO { background: color-mix(in srgb, var(--mute) 10%, var(--bg2)); } .fcell.W1C { border-color: color-mix(in srgb, #7c3aed 50%, var(--line)); }
.fcell.RC { border-color: color-mix(in srgb, var(--warn) 50%, var(--line)); }
.bit { display: inline-grid; place-items: center; width: 26px; height: 30px; font: 700 .95rem var(--mono); border-radius: 5px; }
button.bit { border: 1px solid var(--line2); background: var(--panel); color: var(--ink); cursor: pointer; }
button.bit:hover { border-color: var(--acc); }
.regt tr.truth .bit { color: var(--ok); }
.regb pre.code { margin-bottom: .8rem; }
@media (max-width: 600px) { .bit { width: 20px; height: 26px; font-size: .82rem; } .regt { border-spacing: 2px; } .regt th small { display: none; } }

/* wiring */
.board { margin: .6rem 0 1rem; overflow-x: auto; }
.comp { border: 1px solid var(--line2); border-radius: 12px; padding: .6rem .7rem .7rem; background: color-mix(in srgb, var(--panel) calc(100% - var(--d) * 12%), var(--bg2)); margin-top: .5rem; }
.comp-h { font-size: .8rem; font-weight: 700; color: var(--mute); margin-bottom: .35rem; }
.kids { display: flex; flex-wrap: wrap; gap: .6rem; } .kids > .comp { flex: 1 1 220px; }
.pins { display: flex; flex-wrap: wrap; gap: .4rem; }
.pin { display: inline-flex; align-items: center; gap: .4rem; padding: .35rem .6rem; border-radius: 8px; border: 1px solid var(--line2); background: var(--panel); font: 600 .8rem var(--mono); }
.pin small { font: 500 .65rem var(--sans); color: var(--mute); }
.pin i, .dot { width: 11px; height: 11px; display: inline-block; flex: none; }
.pin.port i, .dot.port { background: var(--acc2); transform: rotate(45deg); }
.pin.export i, .dot.export { border: 2px solid var(--acc); border-radius: 50%; }
.pin.imp i, .dot.imp { background: var(--acc); border-radius: 50%; }
.pin.sel { border-color: var(--warn); box-shadow: 0 0 0 3px color-mix(in srgb, var(--warn) 25%, transparent); }
.pin.live { border-color: var(--ok); background: var(--ok-bg); }
.okc { color: var(--ok); }

/* scoreboard */
.sb-stores { display: grid; grid-template-columns: 1fr 1fr; gap: .8rem; }
@media (max-width: 600px) { .sb-stores { grid-template-columns: 1fr; } }
.txns { display: flex; flex-wrap: wrap; gap: .35rem; min-height: 34px; }
.txn { font: 600 .82rem var(--mono); padding: .25rem .5rem; border-radius: 7px; background: var(--panel2); border: 1px solid var(--line2); }
.txn b { color: var(--acc); }
.txn.big { font-size: 1.1rem; padding: .5rem .9rem; }
.arrive { display: flex; flex-direction: column; align-items: center; gap: .35rem; margin: .4rem 0; animation: deal .2s ease-out; }
.arrive.exp .txn { border-color: var(--acc2); } .arrive.act .txn { border-color: var(--warn); }

@media (max-width: 640px) {
  .rank .xpbar, .rank .xp { display: none; }
  .match { grid-template-columns: 1fr 1fr; gap: .45rem; } .tile { font-size: .8rem; padding: .5rem .55rem; }
  .node, .cls { min-width: 0; }
  .mission { gap: .7rem; padding: .8rem; } .m-score .stars { font-size: .8rem; }
}

/* register bench: one aligned table */
.tablewrap { overflow-x: auto; }
.regt .rowlab { white-space: nowrap; } .regt .rowlab .short { display: none; }
.regt tr.sep td { text-align: left; font: 600 .72rem var(--mono); color: var(--acc); text-transform: uppercase; letter-spacing: .04em; padding-top: .7rem; border-top: 1px dashed var(--line2); }
.regt tr.guess .fcell { background: color-mix(in srgb, var(--acc) 8%, var(--panel)); }
@media (max-width: 600px) { .regt .rowlab .long { display: none; } .regt .rowlab .short { display: inline; } }
.panel { overflow-x: auto; }
.setrow pre { white-space: pre-wrap; word-break: break-word; }
@media (max-width: 600px) {
  .tl-row { grid-template-columns: 1fr; gap: 1.1rem; }
  .tl-row.axis .tl-lab { display: none; }
  .legend { flex-direction: column; gap: .4rem; align-items: flex-start; }
}

/* book figures */
.figbtn { margin-top: 0; }
.lightbox { position: fixed; inset: 0; z-index: 100; background: rgba(4, 8, 12, .88); display: grid; place-items: center; padding: 16px; }
.lightbox figure { margin: 0; max-width: min(1100px, 100%); max-height: 100%; display: flex; flex-direction: column; gap: .6rem; }
.lightbox img { max-width: 100%; max-height: calc(100vh - 120px); width: auto; height: auto; object-fit: contain; background: #fff; border-radius: 8px; align-self: center; }
.lightbox figcaption { display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap; color: #e4ecf3; font-size: .92rem; }
.lb-close, .lb-nav { position: fixed; background: rgba(20,184,166,.85); color: #fff; border: 1px solid rgba(255,255,255,.25); border-radius: 50%; width: 44px; height: 44px; font-size: 1.4rem; cursor: pointer; }
.lb-close { top: 14px; right: 14px; font-size: 1rem; } .lb-nav.prev { left: 10px; top: 50%; } .lb-nav.next { right: 10px; top: 50%; }
.lb-nav:hover, .lb-close:hover { background: rgba(255,255,255,.22); }

/* ---------- reading */
.sec-h { font-size: 1.1rem; margin: 1.6rem 0 .7rem; }
.read-card { background: var(--panel); border: 1px solid var(--acc); border-radius: var(--r); padding: 1rem 1.1rem; margin-bottom: 1rem;
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--acc) 12%, transparent); }
.read-card-h { display: flex; justify-content: space-between; align-items: center; gap: 1rem; flex-wrap: wrap; }
.read-card h2 { margin: .1rem 0 .1rem; font-size: 1.25rem; } .read-card p { margin: 0; }
.read-card .ch-prog { display: block; margin: .8rem 0 .4rem; }
.read-toc { margin: .4rem 0 0; padding-left: 0; list-style: none; columns: 2 280px; column-gap: 1.5rem; font-size: .9rem; }
.read-toc li { padding: .18rem 0; break-inside: avoid; } .read-toc a { color: var(--ink); } .read-toc a:hover { color: var(--acc); }
.read-toc .mono, .toc .mono { color: var(--acc); font-size: .8em; margin-right: .25rem; }
.tick { color: var(--ok); font-style: normal; font-weight: 700; }
.reader-grid { display: grid; grid-template-columns: 230px minmax(0, 1fr); gap: 2rem; align-items: start; }
.toc { position: sticky; top: 70px; max-height: calc(100vh - 90px); overflow: auto; font-size: .86rem; }
.toc summary { cursor: pointer; font-weight: 700; padding: .3rem 0 .5rem; }
.toc ol { list-style: none; margin: 0; padding: 0; }
.toc a { display: block; padding: .32rem .5rem; border-radius: 7px; color: var(--mute); border-left: 2px solid var(--line); }
.toc a:hover { color: var(--ink); background: var(--panel); border-left-color: var(--acc); }
.toc .tick { margin-left: .3rem; }
.lesson { min-width: 0; max-width: 72ch; font-size: 1rem; line-height: 1.7; }
.lsec { position: relative; padding-bottom: 1.4rem; margin-bottom: 1.6rem; border-bottom: 1px solid var(--line); scroll-margin-top: 70px; }
.lsec h2 { font-size: 1.45rem; margin: .4rem 0 .9rem; } .lsec h2 .mono { color: var(--acc); font-size: .75em; margin-right: .3rem; }
.lsec h3 { font-size: 1.08rem; margin: 1.5rem 0 .4rem; }
.lsec p, .brief p { margin: .7rem 0; }
.lsec ul, .lsec ol, .brief ul, .brief ol { padding-left: 1.3rem; } .lsec li, .brief li { margin: .3rem 0; }
.lsec pre.code, .brief pre.code { font-size: .84rem; }
.sec-end { position: absolute; bottom: 0; height: 1px; width: 1px; }
.eli { margin: 0 0 1.1rem; border: 1px solid color-mix(in srgb, var(--k) 35%, var(--line)); border-radius: 10px; background: color-mix(in srgb, var(--k) 7%, transparent); }
.eli summary { cursor: pointer; padding: .5rem .9rem; font-weight: 700; font-size: .92rem; color: var(--k); }
.eli[open] summary { border-bottom: 1px dashed color-mix(in srgb, var(--k) 30%, transparent); }
.eli > :not(summary) { margin-left: .9rem; margin-right: .9rem; } .eli > :last-child { margin-bottom: .8rem; }
.ch-head .eli-all { margin-left: auto; align-self: center; font-size: .82rem; }
.reader .ch-head { flex-wrap: wrap; }
.callout { margin: 1rem 0; padding: .7rem .9rem; border-radius: 10px; border-left: 4px solid var(--acc2); background: color-mix(in srgb, var(--acc2) 9%, transparent); font-size: .95rem; }
.callout.warn { border-left-color: var(--warn); background: color-mix(in srgb, var(--warn) 9%, transparent); }
.callout.rule { border-left-color: var(--acc); background: color-mix(in srgb, var(--acc) 9%, transparent); }
.ltable { overflow-x: auto; margin: 1rem 0; }
.ltable table { border-collapse: collapse; font-size: .9rem; min-width: 100%; }
.ltable th, .ltable td { border: 1px solid var(--line); padding: .4rem .6rem; text-align: left; vertical-align: top; }
.ltable th { background: var(--panel2); font-weight: 700; }
.lfig { margin: 1.1rem 0 1.3rem; }
.lfig-img { display: block; width: 100%; padding: .6rem; cursor: zoom-in; background: #fff; border: 1px solid var(--line); border-radius: 10px; }
.lfig-img:hover { border-color: var(--acc); }
.lfig-img img { display: block; width: 100%; height: auto; max-height: 460px; object-fit: contain; }
.lfig figcaption { font-size: .82rem; color: var(--mute); margin-top: .35rem; }
.lesson-end { padding: 1rem 0 2rem; } .lesson-end p { font-weight: 600; }
.brief { background: var(--panel); border: 1px solid var(--line); border-left: 4px solid var(--acc); border-radius: var(--r); padding: .6rem 1.1rem .8rem; margin-bottom: 1rem; line-height: 1.65; }
.brief.first { border-color: var(--acc); }
.brief-h { display: flex; justify-content: space-between; align-items: center; gap: 1rem; flex-wrap: wrap; padding-top: .4rem; }
@media (max-width: 900px) {
  .reader-grid { grid-template-columns: minmax(0, 1fr); gap: .5rem; }
  .toc { position: static; max-height: none; background: var(--panel); border: 1px solid var(--line); border-radius: var(--r); padding: .5rem .8rem; }
  .lesson { font-size: .97rem; }
}

/* ---------------------------------------------------------------- labs */
.labs-banner { display: flex; flex-wrap: wrap; align-items: center; gap: .4rem 1rem; padding: .9rem 1.1rem; margin-bottom: 1.2rem; color: var(--ink);
  background: linear-gradient(100deg, color-mix(in srgb, var(--acc) 16%, var(--panel)), var(--panel)); border: 1px solid var(--acc); border-radius: var(--r); }
.labs-banner:hover { filter: brightness(1.06); }
.labs-banner .lb-title { font-weight: 700; flex: 1; min-width: 14rem; }
.labs-banner .mono { color: var(--acc); }
.lab-intro { max-width: 72ch; }
.mission.lab-done { border-color: color-mix(in srgb, var(--ok) 55%, var(--line)); }
.mission.lab-done .m-idx { color: var(--ok); border-color: var(--ok); }
.lab-read { margin: 0 0 1rem; } .lab-read .eng { margin-right: .5rem; }
.lab-brief { max-width: 78ch; }
.lab-files { border: 1px solid var(--line); border-radius: var(--r); background: var(--panel); overflow: hidden; }
.lab-tabs { display: flex; flex-wrap: wrap; gap: 4px; padding: .5rem; border-bottom: 1px solid var(--line); background: var(--panel2); }
.lab-tab { font: 500 .78rem var(--mono); color: var(--mute); background: transparent; border: 1px solid transparent; border-radius: 7px; padding: .3rem .55rem; cursor: pointer; }
.lab-tab.task { color: var(--ink); }
.lab-tab.on { background: var(--panel); border-color: var(--acc); color: var(--ink); }
.lab-file { padding: .6rem; }
.lab-file pre.code { font-size: .8rem; max-height: 70vh; }
.lab-file-bar { display: flex; justify-content: space-between; align-items: center; gap: .5rem; margin-bottom: .5rem; flex-wrap: wrap; }
.lab-file-bar .btn.small { margin-top: 0; }
.lab-sol-h { margin: .9rem 0 .4rem; }
.lab-hints ol { margin: 0 0 .4rem; padding-left: 1.3rem; } .lab-hints li { margin: .35rem 0; max-width: 78ch; }
.lab-tests { display: grid; gap: 12px; }
.lab-test { background: var(--panel); border: 1px solid var(--line); border-radius: var(--r); padding: .8rem 1rem; }
.lab-test-h { display: flex; justify-content: space-between; align-items: center; gap: .5rem; }
.lab-badge { font: 600 .8rem var(--mono); color: var(--ok); }
.lab-checks { list-style: none; padding: 0; margin: .6rem 0; font-size: .9rem; }
.lab-checks li { padding: .15rem 0; } .lab-checks .ck { display: inline-block; width: 1.2rem; font-weight: 700; color: var(--mute); }
.lab-checks li.ok .ck { color: var(--ok); } .lab-checks li.bad .ck { color: var(--bad); } .lab-checks li.bad { color: var(--bad); }
.lab-test textarea { width: 100%; box-sizing: border-box; font: .78rem var(--mono); color: var(--ink); background: var(--code-bg);
  border: 1px solid var(--line); border-radius: 8px; padding: .5rem; resize: vertical; }

/* ---------- start here (basics) */
.start-banner { border-color: var(--acc); }
.basics h1 { margin: .2rem 0 .5rem; font-size: clamp(1.5rem, 4.5vw, 2.2rem); }
.two-w { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.tw { padding: .8rem 1rem; border-radius: var(--r); border: 1px solid var(--line); background: var(--panel); }
.tw p { margin: .35rem 0 0; font-size: .92rem; }
.tw.hw, .world.hw { border-color: color-mix(in srgb, var(--warn) 50%, var(--line)); }
.tw.sw, .world.sw { border-color: color-mix(in srgb, var(--acc2) 50%, var(--line)); }
.bw { display: grid; grid-template-columns: 1.6fr .7fr 1fr; gap: 10px; align-items: stretch; }
.world, .bridge { border: 1px solid var(--line); border-radius: var(--r); background: var(--panel); padding: .6rem; display: flex; flex-direction: column; gap: 8px; }
.bridge { border-style: dashed; justify-content: center; }
.world-h { font-weight: 700; font-size: .9rem; } .world-h small { display: block; font-weight: 500; color: var(--mute); font-size: .72rem; }
.bx { position: relative; border: 1px solid var(--line2); border-radius: 10px; background: var(--panel2); padding: .45rem .5rem; cursor: pointer;
  transition: border-color .15s, box-shadow .2s, opacity .2s; }
.bx .bx { background: var(--panel); } .bx .bx .bx { background: var(--panel2); } .bx .bx .bx .bx { background: var(--panel); }
.bx:hover { border-color: var(--acc); }
.bx-h { display: flex; gap: .4rem; align-items: center; line-height: 1.15; }
.bx-h b { font-size: .85rem; } .bx-h small { display: block; color: var(--mute); font-size: .7rem; }
.bx-emo { font-size: 1.15rem; }
.bx-in { display: flex; flex-direction: column; gap: 6px; margin-top: 6px; }
.bx-in.row3 { display: grid; grid-template-columns: repeat(3, 1fr); } .bx-in.row2 { display: grid; grid-template-columns: 1fr 1fr; }
.bx.obj { border-style: dashed; } .bx.chip { padding: .25rem .4rem; }
.bx-arrow { position: absolute; right: .5rem; top: 50%; transform: translateY(-50%); font-size: 1.3rem; color: var(--acc); }
.bx.sel { border-color: var(--acc); box-shadow: 0 0 0 2px color-mix(in srgb, var(--acc) 40%, transparent); }
.bx.lit { border-color: var(--warn); box-shadow: 0 0 0 2px color-mix(in srgb, var(--warn) 45%, transparent), 0 0 18px color-mix(in srgb, var(--warn) 30%, transparent); }
.bx.lit > .bx-h b { color: var(--warn); }
.bx-info { margin-top: 10px; padding: .8rem 1rem; border-radius: var(--r); border: 1px solid var(--line); background: var(--panel); min-height: 4rem; }
.bx-info p { margin: .4rem 0; }
.bi-h { display: flex; gap: .7rem; align-items: center; } .bi-h h3 { margin: 0; } .bi-h p { margin: .1rem 0 0; }
.bi-emo { font-size: 2rem; }
.bi-like { padding: .5rem .7rem; border-radius: 8px; background: color-mix(in srgb, var(--warn) 9%, transparent); }
.ticket { position: sticky; bottom: 12px; z-index: 5; margin: 10px auto 0; width: fit-content; max-width: 100%; padding: .45rem .9rem; border-radius: 99px;
  background: var(--warn); color: #1a1200; font: 700 .85rem var(--mono); box-shadow: var(--shadow); }
.tour { padding: .8rem 1rem; border-radius: var(--r); border: 1px solid var(--line); background: var(--panel); }
.tour-tabs { display: flex; gap: .4rem; flex-wrap: wrap; }
.tour-tabs .btn { margin-top: 0; } .tour-tabs .btn.on { border-color: var(--acc); background: var(--panel2); color: var(--acc); }
.tour-cap { min-height: 6.5rem; } .tour-cap p { margin: .8rem 0 .5rem; }
.tour .row { margin-top: .7rem; } .tour .row .mono { flex: 1; text-align: center; }
#bfm { margin-top: .6rem; }
.bfm-g { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; } .bfm-g.one { grid-template-columns: 1fr; }
.fmap { display: flex; flex-direction: column; gap: 4px; }
.fm { display: grid; grid-template-columns: 13rem 5.5rem 1fr; gap: .6rem; align-items: center; padding: .4rem .7rem; border-radius: 8px;
  border: 1px solid var(--line); background: var(--panel); }
.fm[data-k] { cursor: pointer; } .fm[data-k]:hover, .fm.sel { border-color: var(--acc); }
.fm.sub { margin-left: 1.4rem; } .fm-f { font-size: .82rem; }
.fm-kind { font: 600 .68rem var(--mono); text-transform: uppercase; text-align: center; border-radius: 99px; padding: .1rem .4rem; border: 1px solid; }
.fm-kind.class { color: var(--acc2); } .fm-kind.module, .fm-kind.interface { color: var(--warn); } .fm-kind.package { color: var(--acc); }
.quiz { padding: .9rem 1rem; border-radius: var(--r); border: 1px solid var(--line); background: var(--panel); }
.quiz p { margin: .2rem 0; } .q-q { font-size: 1.1rem; font-weight: 600; margin: .5rem 0 .8rem !important; }
.q-opts { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; } .q-opts .btn { justify-content: flex-start; }
.q-opts .btn.good { background: var(--ok-bg); border-color: var(--ok); opacity: 1; } .q-opts .btn.bad { background: var(--bad-bg); border-color: var(--bad); opacity: 1; }
.q-fb { margin-top: .7rem !important; min-height: 2.6rem; font-size: .92rem; } .q-end { font-size: 1.1rem; }
@media (max-width: 760px) {
  .bw, .two-w, .bfm-g { grid-template-columns: 1fr; }
  .bridge { flex-direction: row; flex-wrap: wrap; } .bridge .world-h { width: 100%; } .bridge .bx { flex: 1; min-width: 9rem; }
  .bx-arrow { display: none; }
  .fm { grid-template-columns: 1fr auto; } .fm-d { grid-column: 1 / -1; } .fm.sub { margin-left: .8rem; }
}
@media (max-width: 460px) { .bx-in.row3 { grid-template-columns: 1fr; } .q-opts { grid-template-columns: 1fr; } }
.basics > .eng { display: block; }
.bw > *, .bx, .bx-in > *, .two-w > *, .bfm-g > *, .fm > *, .q-opts > * { min-width: 0; }
.bx-h > span:last-child { min-width: 0; }
.row3 .bx-h { flex-direction: column; align-items: flex-start; gap: .15rem; }
.bx.pkgbox { border-style: dashed; border-color: color-mix(in srgb, var(--acc) 55%, var(--line)); background: transparent; }
.bx.pkgbox > .bx-h b { color: var(--acc); }
.bi-file { display: flex; align-items: center; gap: .6rem; flex-wrap: wrap; margin: .8rem 0 .4rem; }
.bi-file .btn { margin: 0 0 0 auto; }
pre.code.bi-src { max-height: 65vh; overflow: auto; }
code, .mono, pre.code { font-variant-ligatures: none; }   /* show <= as two characters, not ≤ */

/* ---------- interview prep */
.interview h1 { margin: .2rem 0 .5rem; font-size: clamp(1.5rem, 4.5vw, 2.2rem); }
.interview > .eng { display: block; }
.iv-stats { display: flex; align-items: center; gap: .8rem; flex-wrap: wrap; margin-top: .8rem; }
.iv-bar { flex: 1; min-width: 160px; max-width: 420px; height: 8px; border-radius: 8px; background: var(--panel2); border: 1px solid var(--line); overflow: hidden; display: flex; }
.iv-bar i { display: block; height: 100%; } .iv-bar .got { background: var(--ok); } .iv-bar .shaky { background: var(--warn); } .iv-bar .no { background: var(--bad); }
.iv-hot { margin: 1.4rem 0; padding: 1rem; border-radius: var(--r); border: 1px solid color-mix(in srgb, var(--warn) 60%, var(--line));
  background: color-mix(in srgb, var(--warn) 7%, var(--panel)); }
.iv-hot-h h2 { margin: .3rem 0; } .iv-hot-h p { margin: 0 0 .8rem; max-width: 70ch; }
.iv-hot-badge { font: 700 .72rem var(--mono); text-transform: uppercase; letter-spacing: .06em; color: var(--warn); }
.iv-hot-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(210px, 1fr)); gap: 8px; }
.iv-tile { position: relative; display: flex; flex-direction: column; gap: .35rem; text-align: left; padding: .75rem .8rem .7rem 1.9rem; cursor: pointer;
  font: inherit; color: var(--ink); background: var(--panel); border: 1px solid var(--line2); border-radius: 10px; }
.iv-tile:hover { border-color: var(--warn); } .iv-tile .iv-dot { position: absolute; left: .75rem; top: 1rem; }
.iv-filters { display: flex; flex-wrap: wrap; gap: .35rem; margin: 1rem 0 .7rem; }
.iv-filters .btn { margin: 0; } .iv-filters .btn.on { border-color: var(--acc); color: var(--acc); background: var(--panel2); }
.iv-list { display: grid; gap: 8px; }
.iv-card { background: var(--panel); border: 1px solid var(--line); border-radius: var(--r); }
.iv-card.open { border-color: var(--line2); }
.iv-head { width: 100%; display: flex; align-items: flex-start; gap: .75rem; padding: .8rem 1rem; background: none; border: 0; color: var(--ink);
  font: inherit; text-align: left; cursor: pointer; }
.iv-q { flex: 1; display: flex; flex-direction: column; gap: .2rem; min-width: 0; } .iv-q b { font-size: .98rem; }
.iv-from { display: flex; flex-wrap: wrap; gap: .25rem; }
.co { font: 600 .68rem var(--mono); color: var(--mute); border: 1px solid var(--line2); border-radius: 99px; padding: .05rem .45rem; }
.co.classic:empty { display: none; } .co.classic { color: var(--warn); border-color: color-mix(in srgb, var(--warn) 50%, var(--line)); }
.iv-chev { color: var(--mute); transition: transform .15s; } .iv-card.open .iv-chev { transform: rotate(180deg); }
.iv-dot { flex: none; width: .7rem; height: .7rem; margin-top: .35rem; border-radius: 50%; border: 2px solid var(--line2); }
.got > .iv-head .iv-dot, .iv-tile.got .iv-dot { background: var(--ok); border-color: var(--ok); }
.shaky > .iv-head .iv-dot, .iv-tile.shaky .iv-dot { background: var(--warn); border-color: var(--warn); }
.no > .iv-head .iv-dot, .iv-tile.no .iv-dot { background: var(--bad); border-color: var(--bad); }
.iv-body { padding: 0 1rem 1rem 2.45rem; }
.iv-body li { margin: .3rem 0; } .iv-body p { margin: .55rem 0; }
.iv-src { margin-bottom: .4rem; } .iv-src summary { cursor: pointer; } .iv-src p { border-left: 3px solid var(--line2); padding-left: .6rem; }
.iv-think { padding: .6rem .8rem; border-radius: 10px; background: var(--panel2); border: 1px dashed var(--line2); }
.iv-think .btn { margin-top: .2rem; }
.iv-tw { overflow-x: auto; margin: .6rem 0; }
.iv-t { border-collapse: collapse; font-size: .86rem; min-width: 100%; }
.iv-t th, .iv-t td { border: 1px solid var(--line); padding: .35rem .55rem; text-align: left; vertical-align: top; }
.iv-t th { background: var(--panel2); }
.iv-file { margin-top: .8rem; } .iv-file .tour-tabs { margin-bottom: .4rem; }
.iv-file .btn.on { border-color: var(--acc); color: var(--acc); }
pre.iv-out { white-space: pre-wrap; max-height: 50vh; overflow: auto; }
.iv-links a { margin-right: .9rem; }
.iv-rate { display: flex; flex-wrap: wrap; align-items: center; gap: .4rem; margin-top: 1rem; padding-top: .8rem; border-top: 1px solid var(--line); }
.iv-rate .btn { margin: 0; } .iv-rate .btn.on { border-color: var(--acc); background: var(--panel2); }
.iv-reports { margin-top: 1.6rem; }
.iv-banner { border-color: var(--warn); }
@media (max-width: 560px) { .iv-body { padding-left: 1rem; } }
.sub-h { font-size: 1.02rem; margin: 1.4rem 0 .3rem; }
.uvm-where { margin-top: .8rem; } .uvm-where .fm { grid-template-columns: 11rem 6rem 1fr; }
#pkview, #mxview { margin-top: .5rem; }
.basics .tour-tabs .btn.on { border-color: var(--acc); color: var(--acc); background: var(--panel2); }
@media (max-width: 760px) { .uvm-where .fm { grid-template-columns: 1fr auto; } }
.backtick { margin: 1.2rem 0; padding: 1rem 1.1rem; border-radius: var(--r); border: 2px solid var(--bad);
  background: color-mix(in srgb, var(--bad) 8%, var(--panel)); }
.backtick h2 { margin: 0 0 .4rem; font-size: 1.25rem; }
.bt-rule { font-size: 1.15rem; line-height: 1.45; margin: 0 0 .6rem; }
.bt-rule code { font-size: 1.1em; color: var(--bad); }
.bt-t td:nth-child(2) { text-align: center; width: 2rem; }
.bt-t code { white-space: nowrap; }
ul.tight { margin: .3rem 0 0; padding-left: 1.1rem; } ul.tight li { margin: .2rem 0; font-size: .9rem; }
#shapeview .two-w { margin: .6rem 0; }
.nomacro { margin-top: .8rem; }
.runtest { margin-top: 1rem; } .runtest summary code { font-size: .9em; }

/* bus protocols: waveforms, Bus Detective, bench viewer */
.pr-banner { border-color: var(--acc2); }
.protocols .lab-intro { margin: .2rem 0 1rem; }
.protocols .map { margin-bottom: .6rem; }
.pr-card .pr-name { font: 700 1.15rem var(--mono); color: var(--acc); padding-right: 5.6rem; }
.pr-big { font-size: 1.5rem !important; min-width: 3.6rem; }
.pr-hub { margin-top: 1.6rem; }
.wv-wrap { overflow-x: auto; margin: .8rem 0; padding: .3rem 0; background: var(--code-bg); border: 1px solid var(--line); border-radius: 9px; }
.wv { display: block; font-family: var(--mono); }
.wv-name { fill: var(--ink); font-size: 11px; font-weight: 600; text-anchor: end; }
.wv-tick { fill: var(--mute); font-size: 9.5px; text-anchor: middle; }
.wv-stripe { fill: var(--ink); opacity: .035; }
.wv-clk { fill: none; stroke: var(--mute); stroke-width: 1.3; }
.wv-bit { fill: none; stroke: var(--acc); stroke-width: 1.8; stroke-linejoin: round; }
.wv-z { fill: none; stroke: var(--warn); stroke-width: 1.3; stroke-dasharray: 3 3; opacity: .7; }
.wv-x { fill: var(--bad); opacity: .22; }
.wv-bus { fill: color-mix(in srgb, var(--acc2) 16%, transparent); stroke: var(--acc2); stroke-width: 1.3; }
.wv-busx { fill: color-mix(in srgb, var(--bad) 18%, transparent); stroke: var(--bad); stroke-width: 1; opacity: .6; }
.wv-val { fill: var(--ink); font-size: 11px; text-anchor: middle; }
.wv-mark { stroke: var(--warn); stroke-width: 1.2; stroke-dasharray: 4 3; }
.wv-mark.samp { stroke: var(--k); }
.wv-mtxt { fill: var(--warn); font-size: 10px; }
.wv-col { fill: transparent; cursor: pointer; }
.wv-col:hover { fill: var(--acc); opacity: .1; }
.wv-col.sel { fill: var(--acc); opacity: .28; }
.wv-col.ok { fill: var(--ok); opacity: .3; } .wv-col.miss { fill: var(--warn); opacity: .32; } .wv-col.bad { fill: var(--bad); opacity: .3; }
.wv-col.done, .wv-col.ok, .wv-col.miss, .wv-col.bad { cursor: default; }
.wv-fig { margin: 1rem 0; } .wv-fig figcaption { font-size: .88rem; color: var(--mute); }
.dt { margin-top: .6rem; padding: 1rem; background: var(--panel); border: 1px solid var(--line2); border-radius: var(--r); }
.dt-hud { display: flex; gap: 1rem; flex-wrap: wrap; color: var(--mute); }
.dt-hud .hud-xp { margin-left: auto; color: var(--ok); }
.dt-q { font-weight: 600; font-size: 1.02rem; margin: .7rem 0 .2rem; }
.dt-opts { margin-top: .6rem; }
.dt-fb { margin-top: .9rem; padding: .7rem .9rem; border-radius: 10px; border: 1px solid var(--line2); font-size: .94rem; }
.dt-fb.good { border-color: var(--ok); background: var(--ok-bg); } .dt-fb.bad { border-color: var(--bad); background: var(--bad-bg); }
.dt-fb p { margin: .4rem 0; }
.tlp table td { text-align: center; letter-spacing: .08em; }
.pr-bench .tour-tabs { margin: .6rem 0 .5rem; }
.pr-bench pre.code { max-height: 70vh; overflow: auto; }
@media (max-width: 640px) { .dt { padding: .7rem; } .pr-big { font-size: 1.15rem !important; } }