:root { --ink: #eef0f4; --mut: rgba(238,240,244,.52); --line: rgba(238,240,244,.1); --sc: #4da3ff; --glass: rgba(12,14,19,.62); }
* { box-sizing: border-box; margin: 0; }
html, body { height: 100%; background: #050608; color: var(--ink); font-family: Alexandria, sans-serif; overflow: hidden; -webkit-tap-highlight-color: transparent; }
body::before { content: ""; position: fixed; inset: 0; pointer-events: none;
  background: radial-gradient(45% 55% at 50% 52%, color-mix(in srgb, var(--sc) 15%, transparent), transparent 70%), radial-gradient(80% 50% at 50% 120%, #10131a, transparent); transition: background 1s; }
#gl { position: fixed; inset: 0; width: 100%; height: 100%; display: block; touch-action: none; }
button { font: inherit; color: inherit; cursor: pointer; }

/* header */
header { position: fixed; top: 18px; right: 26px; left: 26px; display: flex; align-items: center; gap: 14px; z-index: 6; font-size: .85rem; }
.logo { font-weight: 900; font-size: 1.15rem; letter-spacing: -.02em; display: flex; align-items: center; gap: 10px; }
.logo i { width: 22px; height: 22px; border-radius: 6px; border: 2px solid var(--ink); position: relative; }
.logo i::after { content: ""; position: absolute; inset: 4px 6px 7px; background: var(--sc); border-radius: 2px; transition: background .6s; }
.modes { margin: 0 auto; display: flex; gap: 4px; padding: 4px; border-radius: 999px; background: rgba(20,22,28,.7); border: 1px solid var(--line); backdrop-filter: blur(10px); }
.modes button { background: none; border: none; padding: 8px 16px; border-radius: 999px; color: var(--mut); font-size: .84rem; }
.modes button.on { background: var(--ink); color: #07080b; font-weight: 700; }
.tag { color: var(--mut); border: 1px solid var(--line); padding: 6px 12px; border-radius: 999px; white-space: nowrap; }

/* run HUD */
.stroke { position: fixed; right: 4vw; top: 15vh; z-index: 4; pointer-events: none; }
.stroke small { display: block; font-family: "JetBrains Mono"; font-size: .75rem; letter-spacing: .3em; color: var(--sc); transition: color .5s; }
.stroke h1 { font-size: clamp(4rem, 9.5vw, 8.6rem); font-weight: 900; line-height: .95; letter-spacing: -.04em; margin: 8px 0 14px;
  background: linear-gradient(180deg, var(--ink), color-mix(in srgb, var(--sc) 70%, var(--ink))); -webkit-background-clip: text; background-clip: text; color: transparent; }
.stroke p { max-width: 30ch; color: var(--mut); line-height: 1.85; font-weight: 300; font-size: .95rem; min-height: 5.5em; }
.live { margin-top: 16px; display: grid; grid-template-columns: repeat(2, auto); gap: 14px 26px; justify-content: start; }
.live b { display: block; font-family: "JetBrains Mono"; font-size: 1.7rem; font-weight: 400; }
.live span { font-size: .7rem; color: var(--mut); }
.steps { display: flex; gap: 6px; margin-top: 18px; }
.steps i { height: 3px; width: 46px; border-radius: 3px; background: var(--line); overflow: hidden; position: relative; }
.steps i b { position: absolute; inset: 0; transform-origin: right; background: var(--c); transform: scaleX(0); }

.panel { position: fixed; z-index: 4; }
.left { left: 3vw; top: 13vh; width: min(370px, 29vw); display: flex; flex-direction: column; gap: 10px; }
.pv { padding: 16px 16px 10px; border-radius: 20px; background: var(--glass); border: 1px solid var(--line); backdrop-filter: blur(10px); }
.pv h3 { font-weight: 500; font-size: .88rem; display: flex; justify-content: space-between; align-items: baseline; }
.pv h3 span { font-family: "JetBrains Mono"; font-size: .68rem; color: var(--mut); }
.pv canvas { width: 100%; height: 200px; display: block; margin-top: 8px; }
.legend { display: flex; gap: 12px; flex-wrap: wrap; font-size: .7rem; color: var(--mut); margin-top: 6px; }
.legend i { display: inline-block; width: 8px; height: 8px; border-radius: 50%; margin-inline-end: 5px; background: var(--c); }
.stats { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.stat { padding: 12px 14px; border-radius: 16px; border: 1px solid var(--line); background: rgba(12,14,19,.5); }
.stat b { display: block; font-family: "JetBrains Mono"; font-size: 1.4rem; font-weight: 400; white-space: nowrap; }
.stat b small { font-size: .66rem; color: var(--mut); margin-inline-start: 4px; }
.stat span { font-size: .7rem; color: var(--mut); }
.knock { padding: 10px 14px; border-radius: 12px; background: rgba(255,60,60,.14); border: 1px solid rgba(255,80,80,.45); color: #ff8a8a; font-size: .8rem; display: none; animation: blink 1s infinite; }
.knock.on { display: block; }
@keyframes blink { 50% { opacity: .55; } }

/* apart mode */
.info { right: 3vw; top: 13vh; width: min(380px, 32vw); padding: 22px; border-radius: 22px; background: var(--glass); border: 1px solid var(--line); backdrop-filter: blur(12px); }
.info small { font-family: "JetBrains Mono"; font-size: .7rem; letter-spacing: .25em; color: var(--sc); }
.info h2 { font-size: 2.2rem; font-weight: 900; letter-spacing: -.03em; margin: 6px 0 10px; }
.info p { color: var(--mut); line-height: 1.9; font-weight: 300; font-size: .93rem; }
.info dl { display: grid; grid-template-columns: auto 1fr; gap: 6px 14px; margin-top: 14px; font-size: .8rem; }
.info dt { color: var(--mut); } .info dd { font-weight: 500; }
.plist { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 18px; padding-top: 16px; border-top: 1px solid var(--line); }
.plist button { background: rgba(255,255,255,.05); border: 1px solid var(--line); padding: 6px 11px; border-radius: 999px; font-size: .76rem; color: var(--mut); }
.plist button.on { background: var(--sc); color: #05070a; border-color: transparent; font-weight: 700; }
#labels { position: fixed; inset: 0; pointer-events: none; z-index: 3; }
.lbl { position: absolute; transform: translate(-50%, -50%); pointer-events: auto; cursor: pointer; white-space: nowrap; font-size: .72rem; padding: 4px 10px; border-radius: 999px;
  background: rgba(10,12,16,.75); border: 1px solid var(--line); color: var(--ink); transition: opacity .3s, background .2s; opacity: 0; }
.lbl::before { content: ""; display: inline-block; width: 6px; height: 6px; border-radius: 50%; background: var(--sc); margin-inline-end: 6px; vertical-align: middle; }
.lbl.on { background: var(--sc); color: #05070a; font-weight: 700; }
body.apart .lbl { opacity: 1; }
[hidden] { display: none !important; }

/* dock */
.dock { position: fixed; bottom: 18px; left: 50%; transform: translateX(-50%); z-index: 6; display: flex; gap: 20px; align-items: center; padding: 14px 20px; border-radius: 22px;
  background: rgba(14,16,22,.8); border: 1px solid var(--line); backdrop-filter: blur(14px); box-shadow: 0 30px 60px -20px #000; width: min(1160px, 95vw); }
.transport { display: flex; gap: 6px; align-items: center; }
.ic { width: 38px; height: 38px; border-radius: 12px; border: 1px solid var(--line); background: rgba(255,255,255,.05); font-size: 1rem; display: grid; place-items: center; }
.pill { border: 1px solid var(--line); background: rgba(255,255,255,.05); padding: 9px 13px; border-radius: 12px; font-size: .78rem; white-space: nowrap; }
.pill.on { background: var(--sc); color: #05070a; border-color: transparent; font-weight: 700; }
.ctl { flex: 1; min-width: 0; }
.ctl label { display: flex; justify-content: space-between; gap: 8px; font-size: .72rem; color: var(--mut); margin-bottom: 8px; white-space: nowrap; }
.ctl label b { font-family: "JetBrains Mono"; color: var(--ink); font-weight: 400; }
input[type=range] { -webkit-appearance: none; appearance: none; width: 100%; height: 4px; border-radius: 4px; background: var(--line); outline: none; }
input[type=range]::-webkit-slider-thumb { -webkit-appearance: none; width: 16px; height: 16px; border-radius: 50%; background: var(--ink); box-shadow: 0 0 0 5px color-mix(in srgb, var(--sc) 35%, transparent); cursor: pointer; }
input[type=range]::-moz-range-thumb { width: 16px; height: 16px; border-radius: 50%; background: var(--ink); border: none; }
.loading { position: fixed; inset: 0; z-index: 20; display: grid; place-items: center; align-content: center; gap: 16px; background: #050608; color: var(--mut); font-size: .9rem; transition: opacity .8s; }
.loading i { width: 38px; height: 38px; border-radius: 50%; border: 2px solid var(--line); border-top-color: var(--sc); animation: spin 1s linear infinite; }
.loading.done { opacity: 0; pointer-events: none; }
@keyframes spin { to { transform: rotate(360deg); } }

@media (max-width: 1000px) {
  header { top: 12px; right: 14px; left: 14px; } .tag { display: none; } .modes { margin: 0; margin-inline-start: auto; }
  .logo { font-size: .95rem; white-space: nowrap; } .modes button { padding: 7px 11px; font-size: .76rem; white-space: nowrap; }
  .stroke { top: 62px; right: 18px; } .stroke h1 { font-size: 2.6rem; margin: 2px 0 4px; } .stroke p { display: none; }
  .live { grid-template-columns: repeat(4, auto); gap: 8px 16px; } .live b { font-size: 1.05rem; } .live span { font-size: .6rem; }
  .left { left: 10px; right: 10px; top: auto; bottom: 214px; width: auto; }
  .pv { padding: 8px 12px 6px; } .pv canvas { height: 64px; } .pv h3 { font-size: .74rem; } .legend, .stats { display: none; }
  .info { right: 10px; left: 10px; width: auto; top: auto; bottom: 214px; padding: 14px 16px; max-height: 42vh; overflow: auto; }
  .info h2 { font-size: 1.5rem; } .info p { font-size: .84rem; }
  body.apart .dock { display: none; } body.apart .info { bottom: 12px; max-height: 36vh; } .plist { display: none; } .info dl { margin-top: 8px; }
  .dock { flex-wrap: wrap; gap: 10px 14px; padding: 12px 14px; bottom: 10px; }
  .transport { width: 100%; justify-content: center; } .ctl { flex: 1 1 40%; }
}

/* ================= study ================= */
.study { right: 3vw; top: 12vh; bottom: 118px; width: min(430px, 34vw); overflow-y: auto; border-radius: 22px; background: var(--glass); border: 1px solid var(--line); backdrop-filter: blur(12px); scrollbar-width: thin; }
.stabs { display: grid; grid-template-columns: repeat(4, 1fr); border-bottom: 1px solid var(--line); position: sticky; top: 0; background: rgba(14,16,22,.92); z-index: 1; }
.stabs button { background: none; border: none; border-left: 1px solid var(--line); padding: 12px 4px 10px; color: var(--mut); font-size: .84rem; position: relative; }
.stabs button:last-child { border-left: none; }
.stabs button small { display: block; font-family: "JetBrains Mono"; font-size: .58rem; letter-spacing: .1em; }
.stabs button.on { color: var(--ink); font-weight: 700; }
.stabs button i { position: absolute; bottom: 0; right: 0; height: 3px; background: var(--c); width: 0; }
.lesson { padding: 18px 20px 6px; }
.lesson small { font-family: "JetBrains Mono"; font-size: .7rem; letter-spacing: .22em; color: var(--sc); }
.lesson h2 { font-size: 2.2rem; font-weight: 900; letter-spacing: -.03em; margin: 4px 0 8px; }
.lesson p { color: var(--mut); line-height: 1.9; font-weight: 300; font-size: .92rem; }
.lesson ul { margin: 10px 0 0; padding: 0 18px 0 0; display: grid; gap: 6px; font-size: .86rem; line-height: 1.75; }
.lesson li::marker { color: var(--sc); }
.fx { margin: 12px 20px 0; padding: 14px 16px; border-radius: 14px; background: rgba(0,0,0,.28); border: 1px solid var(--line); }
.fx h4, .quiz .qh b { font-size: .74rem; color: var(--mut); font-weight: 500; }
.fx #stFx { font-family: "JetBrains Mono"; direction: ltr; text-align: left; font-size: .8rem; line-height: 1.95; margin-top: 6px; }
.fx .eq { color: var(--sc); } .fx .v { color: var(--mut); }
.snav { display: flex; gap: 6px; padding: 14px 20px; }
.snav button { flex: 1; background: rgba(255,255,255,.05); border: 1px solid var(--line); border-radius: 12px; padding: 9px 8px; font-size: .8rem; }
.snav #stPlay { flex: 0 0 44px; }
.quiz { margin: 0 20px 20px; padding: 16px; border-radius: 16px; border: 1px dashed color-mix(in srgb, var(--sc) 45%, transparent); }
.qh { display: flex; justify-content: space-between; align-items: center; margin-bottom: 10px; }
.qh span { font-family: "JetBrains Mono"; font-size: .74rem; color: var(--sc); }
.qq { font-weight: 600; line-height: 1.75; margin-bottom: 10px; font-size: .95rem; }
.qo { display: grid; gap: 6px; }
.qo button { text-align: right; background: rgba(255,255,255,.04); border: 1px solid var(--line); border-radius: 12px; padding: 10px 12px; font-size: .86rem; line-height: 1.6; }
.qo button:hover:not(:disabled) { border-color: color-mix(in srgb, var(--sc) 60%, transparent); }
.qo button.ok { border-color: #5be39b; background: rgba(91,227,155,.12); color: #8ff0bb; }
.qo button.no { border-color: #ff7a7a; background: rgba(255,122,122,.1); color: #ffadad; }
.qo button:disabled { cursor: default; }
.qexp { margin-top: 10px; font-size: .84rem; line-height: 1.8; color: var(--mut); display: none; }
.qexp.on { display: block; }
.qnext { margin-top: 10px; width: 100%; background: var(--sc); color: #05070a; border: none; border-radius: 12px; padding: 10px; font-weight: 700; display: none; }
.qnext.on { display: block; }

/* ================= dyno ================= */
body[data-mode=dyno] { --sc: #ff5b1f; }
.tachp { right: 3vw; top: 12vh; width: min(380px, 29vw); padding: 18px 18px 14px; border-radius: 22px; background: var(--glass); border: 1px solid var(--line); backdrop-filter: blur(12px); text-align: center; }
#tach { width: 100%; display: block; }
.tbig { margin-top: -82px; position: relative; }
.tbig b { font-family: "JetBrains Mono"; font-size: 2.8rem; font-weight: 600; letter-spacing: -.03em; line-height: 1; }
.tbig span { display: block; font-size: .64rem; color: var(--mut); letter-spacing: .3em; font-family: "JetBrains Mono"; }
.readout { display: grid; grid-template-columns: repeat(3, 1fr); margin-top: 22px; border-top: 1px solid var(--line); }
.readout div { padding: 12px 4px 2px; border-left: 1px solid var(--line); }
.readout div:last-child { border-left: none; }
.readout b { display: block; font-family: "JetBrains Mono"; font-size: 1.4rem; font-weight: 400; }
.readout span { font-size: .66rem; color: var(--mut); }
.tachp .knock { margin-top: 10px; }
.dynop { left: 3vw; top: 12vh; width: min(400px, 31vw); padding: 16px; border-radius: 22px; background: var(--glass); border: 1px solid var(--line); backdrop-filter: blur(12px); }
.dynop h3 { font-weight: 500; font-size: .88rem; display: flex; justify-content: space-between; align-items: baseline; gap: 8px; }
.dynop h3 span { font-size: .68rem; color: var(--mut); font-weight: 300; }
#dyno { width: 100%; height: 230px; display: block; margin-top: 8px; }
.dleg { display: flex; gap: 14px; font-size: .72rem; color: var(--mut); margin-top: 4px; }
.dleg i { display: inline-block; width: 14px; height: 3px; border-radius: 2px; vertical-align: middle; margin-inline-end: 6px; }
.peaks { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin-top: 12px; }
.peaks div { border: 1px solid var(--line); border-radius: 12px; padding: 9px 12px; }
.peaks b { font-family: "JetBrains Mono"; font-size: 1.05rem; font-weight: 400; display: block; direction: ltr; text-align: right; }
.peaks span { font-size: .66rem; color: var(--mut); }
.pedal { flex: 0 0 210px; align-self: stretch; border-radius: 16px; border: 2px solid var(--sc); color: var(--sc); font-weight: 800; font-size: .95rem; padding: 10px;
  background: repeating-linear-gradient(0deg, #1a0d07 0 9px, #24110a 9px 11px); display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 2px; touch-action: none; user-select: none; -webkit-user-select: none; transition: transform .08s, box-shadow .2s; }
.pedal small { font-weight: 300; color: var(--mut); font-size: .66rem; }
.pedal.down { transform: perspective(400px) rotateX(16deg) scale(.97); box-shadow: 0 0 40px rgba(255,91,31,.45), inset 0 0 26px rgba(255,91,31,.3); background: repeating-linear-gradient(0deg, #3a1608 0 9px, #4a1c0a 9px 11px); }
.dbtns { display: flex; flex-direction: column; gap: 6px; }

@media (max-width: 1000px) {
  .modes button { padding: 7px 8px; font-size: .7rem; }
  .study { right: 10px; left: 10px; width: auto; top: auto; bottom: 168px; max-height: 50vh; }
  .lesson h2 { font-size: 1.5rem; } .lesson ul { display: none; }
  .tachp { right: 10px; left: auto; top: 60px; width: 190px; padding: 10px; }
  .tbig { margin-top: -50px; } .tbig b { font-size: 1.6rem; } .readout { margin-top: 10px; } .readout b { font-size: .95rem; } .readout span { font-size: .55rem; }
  .dynop { left: 10px; right: 10px; width: auto; top: auto; bottom: 200px; padding: 10px 12px; } #dyno { height: 90px; } .peaks, .dleg { display: none; }
  .pedal { flex: 1 1 100%; min-height: 64px; order: -1; } .dbtns { flex-direction: row; width: 100%; } .dbtns .pill { flex: 1; }
}

@media (max-width: 1000px) {
  body[data-mode=study] .left { display: none; }
  .study { bottom: 236px; max-height: calc(100vh - 330px); }
  body[data-mode=dyno] .dock .ctl label { font-size: .64rem; }
}

@media (max-width: 1000px) {
  header { flex-wrap: wrap; row-gap: 8px; }
  .modes { order: 3; width: 100%; margin: 0; } .modes button { flex: 1; padding: 7px 4px; }
  .stroke { top: 104px; } .tachp { top: 104px; }
  .study { max-height: calc(100vh - 360px); }
}