/* How Software Works · chapter player. Night stage, one accent per chapter (--acc). */
:root{--acc:#5DB3E4;--night:#05060c;--bone:#F2F3EF;--mist:#CDD1C8;--moss:#9CA28F;--gold:#E9B949;
  --disp:"Unbounded","Geist",system-ui,sans-serif;--sans:"Geist","Helvetica Neue",system-ui,sans-serif;--mono:"Geist Mono",ui-monospace,Menlo,monospace;
  --ease:cubic-bezier(.22,1,.36,1);--glass:rgba(14,16,28,.62);--line:rgba(242,243,239,.12)}
*{box-sizing:border-box}
html,body{margin:0;height:100%;background:var(--night);color:var(--bone);font-family:var(--sans);-webkit-font-smoothing:antialiased;overscroll-behavior:none}
body{overflow:hidden}
button{font:inherit;color:inherit;cursor:pointer}
#sw{--fb:30px;position:fixed;inset:0;overflow:hidden;touch-action:none;user-select:none;-webkit-user-select:none}
.sw-gl{position:absolute;inset:0;width:100%;height:100%;display:block;cursor:grab;outline:none}
.sw-gl:active{cursor:grabbing}
.sw-vig{position:absolute;inset:0;pointer-events:none;background:radial-gradient(120% 90% at 50% 45%,transparent 55%,rgba(2,3,8,.75) 100%)}
.sw-grain{position:absolute;inset:-50%;pointer-events:none;opacity:.06;mix-blend-mode:overlay;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)'/%3E%3C/svg%3E");animation:grain 1s steps(6) infinite}
@keyframes grain{0%{transform:translate(0,0)}25%{transform:translate(-3%,2%)}50%{transform:translate(2%,-3%)}75%{transform:translate(-2%,-1%)}100%{transform:translate(1%,3%)}}
.sw-fade{position:absolute;inset:0;background:var(--night);pointer-events:none;opacity:1;transition:opacity 1.2s var(--ease)}
#sw.ready .sw-fade{opacity:0}
.sw-flash{position:absolute;inset:0;pointer-events:none;background:var(--night);opacity:0;z-index:4}
.sw-flash.go{animation:swflash .5s var(--ease)}
@keyframes swflash{0%{opacity:0}35%{opacity:.85}100%{opacity:0}}

/* ---------- top bar ---------- */
.sw-top{position:absolute;left:0;right:0;top:calc(var(--fb) + env(safe-area-inset-top));display:flex;align-items:center;gap:14px;padding:12px 16px;z-index:20;
  background:linear-gradient(180deg,rgba(5,6,12,.78),rgba(5,6,12,0));pointer-events:none}
.sw-top>*{pointer-events:auto}
.sw-home{display:flex;align-items:center;gap:9px;color:var(--bone);text-decoration:none;font-size:14px;white-space:nowrap}
.sw-home svg{width:28px;height:28px;flex:none}
.sw-home b{font-family:var(--disp);font-weight:700;font-size:14px;letter-spacing:-.01em}
.sw-home span{color:var(--mist)}
.sw-chaps{display:flex;gap:4px;margin:0 auto;padding:4px;border-radius:999px;background:rgba(14,16,28,.55);border:1px solid var(--line);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);overflow-x:auto;scrollbar-width:none;max-width:100%}
.sw-chaps::-webkit-scrollbar{display:none}
.sw-chaps a{display:flex;align-items:center;gap:7px;padding:6px 12px 6px 7px;border-radius:999px;color:var(--mist);text-decoration:none;font-size:13px;white-space:nowrap;transition:background .3s,color .3s}
.sw-chaps a i{display:grid;place-items:center;width:20px;height:20px;border-radius:50%;font:600 11px var(--mono);font-style:normal;border:1px solid color-mix(in srgb,var(--c) 70%,transparent);color:var(--c)}
.sw-chaps a:hover{color:var(--bone);background:rgba(242,243,239,.06)}
.sw-chaps a[aria-current]{color:#0b0c12;background:var(--c);font-weight:600}
.sw-chaps a[aria-current] i{border-color:#0b0c12;color:#0b0c12}
.sw-mode{display:flex;padding:3px;border-radius:999px;background:rgba(14,16,28,.55);border:1px solid var(--line);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);flex:none}
.sw-mode button{border:0;background:none;padding:7px 13px;border-radius:999px;font-size:13px;color:var(--mist);transition:background .3s,color .3s}
.sw-mode button[aria-checked=true]{background:var(--bone);color:#0b0c12;font-weight:600}

/* ---------- poster + end ---------- */
.sw-ov{position:absolute;inset:0;z-index:12;display:flex;align-items:flex-end;padding:0 clamp(18px,5vw,72px) clamp(96px,14vh,140px);pointer-events:none;
  background:linear-gradient(90deg,rgba(5,6,12,.86) 0%,rgba(5,6,12,.55) 38%,rgba(5,6,12,0) 66%),linear-gradient(0deg,rgba(5,6,12,.75),rgba(5,6,12,0) 45%)}
.sw-ov[hidden]{display:none}
.sw-ov .in{max-width:620px;pointer-events:auto}
.sw-ov .ey{display:inline-block;font:500 12px var(--mono);letter-spacing:.16em;text-transform:uppercase;color:var(--acc);margin-bottom:14px}
.sw-ov h1{font-family:var(--disp);font-weight:700;font-size:clamp(34px,6.2vw,74px);line-height:.98;letter-spacing:-.035em;margin:0 0 14px;text-wrap:balance}
.sw-ov .q{font-size:clamp(18px,2.2vw,24px);color:var(--bone);margin:0 0 8px;font-weight:500}
.sw-ov .lede{font-size:clamp(15px,1.6vw,17px);line-height:1.5;color:var(--mist);margin:0 0 26px;max-width:52ch}
.sw-ov .row{display:flex;flex-wrap:wrap;gap:12px;align-items:center}
.sw-ov .chips{display:flex;flex-wrap:wrap;gap:8px;margin-top:20px}
.sw-ov .chips span{font:500 11px var(--mono);letter-spacing:.08em;text-transform:uppercase;color:var(--moss);border:1px solid var(--line);border-radius:999px;padding:6px 10px}
.sw-play{display:inline-flex;align-items:center;gap:12px;border:0;border-radius:999px;padding:8px 22px 8px 8px;background:var(--bone);color:#0b0c12;font-weight:650;font-size:16px;text-decoration:none;
  box-shadow:0 0 0 1px rgba(255,255,255,.2),0 16px 50px -12px color-mix(in srgb,var(--acc) 70%,transparent);transition:transform .3s var(--ease)}
.sw-play:hover{transform:translateY(-2px)}
.sw-play span{display:grid;place-items:center;width:40px;height:40px;border-radius:50%;background:var(--acc)}
.sw-play svg{width:16px;height:16px;fill:#0b0c12;margin-left:2px}
.sw-btn{display:inline-flex;align-items:center;gap:9px;border:1px solid var(--line);border-radius:999px;padding:12px 18px;background:rgba(14,16,28,.55);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);color:var(--bone);font-size:15px;font-weight:550;text-decoration:none;transition:border-color .3s,background .3s}
.sw-btn:hover{border-color:color-mix(in srgb,var(--acc) 70%,transparent);background:rgba(24,28,46,.7)}
.sw-btn svg{width:18px;height:18px;color:var(--acc)}
.sw-btn.sm{padding:8px 14px;font-size:13px}

/* ---------- film overlays ---------- */
.sw-kin{position:absolute;left:clamp(18px,5vw,64px);top:calc(var(--fb) + 80px + env(safe-area-inset-top));z-index:6;pointer-events:none;opacity:0;max-width:min(560px,80vw)}
.sw-kin span{display:block;font:500 12px var(--mono);letter-spacing:.18em;color:var(--acc);margin-bottom:6px}
.sw-kin b{display:block;font-family:var(--disp);font-weight:700;font-size:clamp(24px,3.6vw,44px);line-height:1.02;letter-spacing:-.03em;text-shadow:0 4px 40px rgba(0,0,0,.6)}
.sw-code{position:absolute;right:clamp(14px,3vw,40px);top:calc(var(--fb) + 78px + env(safe-area-inset-top));z-index:6;pointer-events:none;opacity:0;width:min(460px,46vw);
  border-radius:14px;background:rgba(8,10,20,.72);border:1px solid color-mix(in srgb,var(--acc) 35%,rgba(255,255,255,.08));backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);box-shadow:0 30px 80px -30px rgba(0,0,0,.8)}
.sw-code .cd-h{display:flex;align-items:center;gap:6px;padding:10px 14px;border-bottom:1px solid var(--line)}
.sw-code .cd-h i{width:9px;height:9px;border-radius:50%;background:rgba(242,243,239,.18)}
.sw-code .cd-h i:first-child{background:var(--acc)}
.sw-code .cd-h span{margin-left:8px;font:500 11px var(--mono);letter-spacing:.12em;text-transform:uppercase;color:var(--moss)}
.sw-code pre{margin:0;padding:14px 16px 16px;font:500 clamp(11.5px,1.05vw,13.5px)/1.6 var(--mono);color:#dfe6f2;white-space:pre-wrap;word-break:break-word}
.sw-code .caret{display:inline-block;width:.6em;height:1.1em;vertical-align:-.2em;background:var(--acc);margin-left:1px;animation:blink 1s steps(2) infinite}
@keyframes blink{50%{opacity:0}}
#sw[data-mode=technical] .sw-kin{display:none}
.sw-subs{position:absolute;left:50%;transform:translateX(-50%);bottom:calc(84px + env(safe-area-inset-bottom));z-index:7;width:min(900px,92vw);text-align:center;pointer-events:none;opacity:0;transition:opacity .25s}
.sw-subs p{display:inline;margin:0;font-size:clamp(16px,1.9vw,22px);line-height:1.5;font-weight:520;padding:4px 12px;border-radius:8px;background:rgba(5,6,12,.55);-webkit-box-decoration-break:clone;box-decoration-break:clone}
.sw-subs span{color:rgba(242,243,239,.55);transition:color .15s}
.sw-subs span.on{color:var(--bone)}

/* ---------- controls ---------- */
.sw-ctrl{position:absolute;left:clamp(10px,3vw,36px);right:clamp(10px,3vw,36px);bottom:calc(16px + env(safe-area-inset-bottom));z-index:15;display:flex;align-items:center;gap:10px;
  padding:7px 10px;border-radius:999px;background:var(--glass);border:1px solid var(--line);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);transition:opacity .4s,transform .4s var(--ease)}
#sw[data-ui=poster] .sw-ctrl{opacity:0;transform:translateY(20px);pointer-events:none}
.ib{display:inline-flex;align-items:center;justify-content:center;gap:7px;min-width:38px;height:38px;border:0;border-radius:999px;background:transparent;color:var(--bone);font:600 12px var(--mono);padding:0 9px}
.ib:hover{background:rgba(242,243,239,.08)}
.ib svg{width:16px;height:16px;fill:currentColor}
.ib .i-pause{display:none}
#sw.playing .ib .i-play{display:none}
#sw.playing .ib .i-pause{display:block}
.ib.cc{opacity:.5}.ib.cc.on{opacity:1}
.ib.ap{border:1px solid color-mix(in srgb,var(--acc) 60%,transparent);color:var(--bone);font:600 13px var(--sans);padding:0 14px 0 11px}
.ib.ap svg{fill:none;color:var(--acc);width:18px;height:18px}
.tl{position:relative;flex:1;height:30px;cursor:pointer;outline:none}
.tl .segs{position:absolute;left:0;right:0;top:50%;height:5px;margin-top:-2.5px;display:flex;gap:3px}
.tl .segs i{position:relative;height:100%;background:rgba(242,243,239,.16);border-radius:3px;overflow:hidden}
.tl .segs b{position:absolute;inset:0 auto 0 0;width:0;background:var(--acc)}
.tl .head{position:absolute;top:50%;width:13px;height:13px;margin:-6.5px 0 0 -6.5px;border-radius:50%;background:var(--bone);box-shadow:0 0 0 4px color-mix(in srgb,var(--acc) 35%,transparent)}
.tl .tip{position:absolute;bottom:30px;transform:translateX(-50%);font:500 11px var(--mono);white-space:nowrap;background:rgba(5,6,12,.85);border:1px solid var(--line);padding:4px 8px;border-radius:6px;opacity:0;transition:opacity .2s;pointer-events:none}
.tl:hover .tip{opacity:1}
.time{font:500 12px var(--mono);color:var(--mist);white-space:nowrap}

/* ---------- take it apart ---------- */
.sw-apart{position:absolute;inset:0;z-index:14;pointer-events:none;opacity:0;transition:opacity .5s}
#sw.apart-on .sw-apart{opacity:1}
#sw[data-ui=apart] .sw-apart{pointer-events:none}
#sw[data-ui=apart] .sw-apart>*{pointer-events:auto}
#sw[data-ui=apart] .sw-apart .pins{pointer-events:none}
#sw[data-ui=apart] .sw-ctrl,#sw[data-ui=apart] .sw-subs{opacity:0;pointer-events:none}
.sw-apart .bar{position:absolute;left:50%;transform:translateX(-50%);bottom:calc(16px + env(safe-area-inset-bottom));display:flex;align-items:center;gap:16px;padding:8px 8px 8px 18px;border-radius:999px;background:var(--glass);border:1px solid var(--line);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);white-space:nowrap}
.sw-apart .bar .ey{font:500 11px var(--mono);letter-spacing:.14em;text-transform:uppercase;color:var(--acc)}
.sw-apart .sl{display:flex;align-items:center;gap:10px;font:500 11px var(--mono);color:var(--moss);text-transform:uppercase;letter-spacing:.08em}
.sw-apart input[type=range]{width:min(220px,30vw);accent-color:var(--acc)}
.sw-apart .pins{position:absolute;inset:0;transition:opacity .3s}
.pin{position:absolute;left:0;top:0;display:flex;align-items:center;gap:8px;border:0;background:none;padding:0;pointer-events:auto;will-change:transform}
.pin i{display:grid;place-items:center;flex:none;width:24px;height:24px;margin:-12px 0 0 -12px;border-radius:50%;background:var(--bone);color:#0b0c12;font:700 11px var(--mono);font-style:normal;box-shadow:0 0 0 4px color-mix(in srgb,var(--acc) 40%,transparent),0 6px 20px rgba(0,0,0,.5)}
.pin span{margin-top:-12px;padding:5px 10px;border-radius:8px;background:rgba(8,10,20,.78);border:1px solid var(--line);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);font-size:13px;font-weight:560;white-space:nowrap;max-width:220px;overflow:hidden;text-overflow:ellipsis}
.pin.left{flex-direction:row-reverse}
.pin.left i{margin:-12px -12px 0 0}
.pin.on i{background:var(--acc);transform:scale(1.15)}
.pin.on span{border-color:var(--acc)}
#sw.has-sel .pin:not(.on){opacity:.45}
.sw-apart .sheet{position:absolute;right:clamp(12px,3vw,36px);top:calc(var(--fb) + 78px + env(safe-area-inset-top));width:min(360px,90vw);padding:18px 18px 14px;border-radius:16px;background:rgba(10,12,22,.82);border:1px solid color-mix(in srgb,var(--acc) 40%,rgba(255,255,255,.1));backdrop-filter:blur(18px);-webkit-backdrop-filter:blur(18px);box-shadow:0 30px 80px -30px rgba(0,0,0,.9)}
.sw-apart .sheet[hidden]{display:none}
.sh-h{display:flex;align-items:center;gap:10px;margin-bottom:8px}
.sh-h .num{display:grid;place-items:center;width:26px;height:26px;border-radius:50%;background:var(--acc);color:#0b0c12;font:700 12px var(--mono)}
.sh-h .ttl{flex:1;font-family:var(--disp);font-size:17px;font-weight:700;letter-spacing:-.01em;line-height:1.15}
.sh-h .x{border:0;background:none;color:var(--moss);font-size:22px;line-height:1;width:30px;height:30px;border-radius:50%}
.sheet .txt{margin:0 0 12px;font-size:15px;line-height:1.55;color:var(--mist)}
.sheet .nav{display:flex;align-items:center;justify-content:space-between;border-top:1px solid var(--line);padding-top:10px}
.sheet .nav button{border:1px solid var(--line);background:none;border-radius:50%;width:34px;height:34px;font-size:18px;color:var(--bone)}
.sheet .nav .pos{font:500 12px var(--mono);color:var(--moss)}
#sw[data-mode=technical] .sheet .txt{font-size:14.5px}
.sw-apart .list{display:none}
.sw-apart .hint{position:absolute;left:50%;transform:translateX(-50%);bottom:calc(76px + env(safe-area-inset-bottom));margin:0;font:500 11px var(--mono);letter-spacing:.08em;text-transform:uppercase;color:var(--moss);white-space:nowrap}
#sw.has-sel .sw-apart .hint{opacity:0}

/* ---------- narrow screens ---------- */
#sw.narrow .sw-top{flex-wrap:wrap;gap:8px 10px;padding:10px 12px}
#sw.narrow .sw-home span{display:none}
#sw.narrow .sw-home b{display:none}
#sw.narrow .sw-chaps{order:3;flex:1 1 100%;margin:0}
#sw.narrow .sw-chaps a span{display:none}
#sw.narrow .sw-chaps a{padding:5px}
#sw.narrow .sw-chaps a[aria-current] span{display:inline;margin-right:4px}
#sw.narrow .sw-mode{margin-left:auto}
#sw.narrow .sw-mode button{padding:6px 11px;font-size:12px}
#sw.narrow .sw-ov{align-items:flex-end;padding-bottom:calc(30px + env(safe-area-inset-bottom));background:linear-gradient(0deg,rgba(5,6,12,.95) 0%,rgba(5,6,12,.7) 50%,rgba(5,6,12,0) 78%)}
#sw.narrow .sw-ov h1{font-size:clamp(30px,9vw,40px)}
#sw.narrow .sw-ov .lede{margin-bottom:20px}
#sw.narrow .sw-ov .chips{display:none}
#sw.narrow .sw-kin{top:calc(var(--fb) + 104px + env(safe-area-inset-top))}
#sw.narrow .sw-code{left:12px;right:12px;width:auto;top:calc(var(--fb) + 102px + env(safe-area-inset-top))}
#sw.narrow .sw-code pre{font-size:11px;padding:10px 12px 12px}
#sw.narrow .sw-subs{bottom:calc(74px + env(safe-area-inset-bottom))}
#sw.narrow .sw-subs p{font-size:15px}
#sw.narrow .time{display:none}
#sw.narrow .ib.ap span{display:none}
#sw.narrow .ib.ap{padding:0 9px}
#sw.narrow .pin span{display:none}
#sw.narrow .sw-apart .bar{left:12px;right:12px;transform:none;padding:6px 6px 6px 14px;gap:10px}
#sw.narrow .sw-apart .bar .ey{display:none}
#sw.narrow .sw-apart .sl>span{display:none}
#sw.narrow .sw-apart .sl{flex:1}
#sw.narrow .sw-apart input[type=range]{width:100%}
#sw.narrow .sw-apart .sheet{left:12px;right:12px;width:auto;top:auto;bottom:calc(72px + env(safe-area-inset-bottom))}
#sw.narrow .sw-apart .list{display:flex;position:absolute;left:12px;right:12px;top:calc(var(--fb) + 104px + env(safe-area-inset-top));margin:0;padding:0;list-style:none;gap:6px;overflow-x:auto;scrollbar-width:none}
#sw.narrow .sw-apart .list::-webkit-scrollbar{display:none}
#sw.narrow .sw-apart .list button{display:flex;align-items:center;gap:7px;white-space:nowrap;border:1px solid var(--line);background:rgba(8,10,20,.72);border-radius:999px;padding:5px 11px 5px 5px;font-size:12px;color:var(--mist)}
#sw.narrow .sw-apart .list i{display:grid;place-items:center;width:20px;height:20px;border-radius:50%;background:var(--bone);color:#0b0c12;font:700 10px var(--mono);font-style:normal}
#sw.narrow .sw-apart .list button.on{border-color:var(--acc);color:var(--bone)}
#sw.narrow .sw-apart .hint{bottom:calc(70px + env(safe-area-inset-bottom))}
@media (prefers-reduced-motion:reduce){.sw-grain{animation:none}}

/* the Yagrumo family bar sits above the player */
.ygf.ygf-fixed{z-index:30}