:root {
  --field: #689ce0;
  --ink: #0f1526;
  --red: #e54826;
  --pale: #ecf3fc;
  --card: rgba(236, 243, 252, 0.4);
  --card-strong: rgba(236, 243, 252, 0.78);
  --line: rgba(15, 21, 38, 0.26);
  --muted: rgba(15, 21, 38, 0.62);
  --track: rgba(15, 21, 38, 0.16);
  --serif: "Fraunces", Georgia, serif;
  --sans: "DM Sans", system-ui, -apple-system, sans-serif;
  --math: "Fraunces", "Noto Sans Math", "STIX Two Math", "Cambria Math", "DejaVu Sans", serif;
  --soft: 0 10px 34px rgba(15, 21, 38, 0.12);
}
:root[data-theme="night"] {
  --field: #121f46;
  --ink: #e8edf6;
  --red: #ff684a;
  --pale: #2c3f72;
  --card: rgba(22, 36, 80, 0.5);
  --card-strong: rgba(22, 36, 80, 0.86);
  --line: rgba(232, 237, 246, 0.24);
  --muted: rgba(232, 237, 246, 0.62);
  --track: rgba(232, 237, 246, 0.16);
  --soft: 0 10px 34px rgba(0, 0, 0, 0.3);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; overflow: hidden; background: var(--field); color: var(--ink); font-family: var(--sans); -webkit-font-smoothing: antialiased; overscroll-behavior: none; -webkit-tap-highlight-color: transparent; }
button { font: inherit; color: inherit; }
sup { font-size: 0.62em; line-height: 0; }

#stage { position: fixed; inset: 0; width: 100%; height: 100%; touch-action: none; cursor: grab; }
#stage:active { cursor: grabbing; }
.grain { position: fixed; inset: 0; pointer-events: none; opacity: 0.32; mix-blend-mode: overlay; z-index: 1; }
:root[data-theme="night"] .grain { opacity: 0.18; }

/* ---------- header & chips ---------- */
.brand { position: fixed; left: 30px; top: 24px; z-index: 3; pointer-events: none; }
.brand h1 { font-family: var(--serif); font-variation-settings: "SOFT" 60; font-weight: 400; font-size: clamp(24px, 2.3vw, 38px); letter-spacing: -0.015em; line-height: 1; }
.brand h1 em { font-style: italic; font-weight: 300; color: var(--red); }
.brand p { font: italic 300 clamp(15px, 1.15vw, 18px) var(--serif); color: var(--muted); margin-top: 6px; }

.sensors { position: fixed; right: 20px; top: 20px; display: flex; gap: 7px; z-index: 6; flex-wrap: wrap; justify-content: flex-end; }
.chip {
  display: inline-flex; align-items: center; gap: 7px; height: 36px; padding: 0 14px;
  font: 500 14px var(--sans); border: 1px solid var(--line); border-radius: 18px;
  background: var(--card); cursor: pointer; backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
  transition: background 0.25s, color 0.25s, border-color 0.25s;
}
@media (hover: hover) { .chip:hover { border-color: var(--ink); } }
.chip svg { width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; flex: none; }
.chip[aria-pressed="true"]:not(#btnSound) { background: var(--ink); color: var(--pale); border-color: var(--ink); }
:root[data-theme="night"] .chip[aria-pressed="true"]:not(#btnSound) { color: #121f46; }
#btnSound[aria-pressed="false"] .w { opacity: 0.12; }
#btnSound[aria-pressed="false"] { color: var(--muted); }
.chip.icon { width: 36px; padding: 0; justify-content: center; font-weight: 600; font-size: 14px; }
.chip .vu { width: 26px; height: 4px; border-radius: 2px; overflow: hidden; display: none; background: rgba(127, 127, 127, 0.35); }
#btnMic[aria-pressed="true"] .vu { display: block; }
.vu i { display: block; height: 100%; width: 0; background: var(--red); }
.chip.busy svg { animation: pulse 0.9s ease-in-out infinite; }
@keyframes pulse { 50% { opacity: 0.3; } }

/* ---------- panel ---------- */
.hud { display: contents; }
.panel { position: fixed; right: 20px; top: 72px; width: 318px; display: flex; flex-direction: column; gap: 10px; z-index: 4; max-height: calc(100% - 96px); overflow: auto; scrollbar-width: none; }
.card {
  background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 14px 16px 15px;
  backdrop-filter: blur(14px) saturate(1.1); -webkit-backdrop-filter: blur(14px) saturate(1.1); box-shadow: var(--soft);
}
.card h2 { font: italic 400 19px/1 var(--serif); margin-bottom: 10px; display: flex; align-items: center; gap: 9px; }
.card h2::before { content: ""; width: 8px; height: 7px; border-radius: 50%; background: var(--ink); }
.card.meas h2::before { background: var(--red); }
body[data-mode="manip"] .measure-only, body[data-mode="measure"] .manip-only { display: none; }

.ketline { font-family: var(--math); font-size: 19px; line-height: 1.35; min-height: 50px; margin-bottom: 10px; font-variant-numeric: tabular-nums; }
.ketline .k { white-space: nowrap; }
.ketline small { display: block; font: italic 300 14.5px/1.2 var(--serif); color: var(--muted); margin-top: 3px; }
.ketline sup { font-size: 0.6em; }

.pbar { position: relative; height: 8px; border-radius: 4px; overflow: hidden; display: flex; background: var(--track); }
.pbar span { height: 100%; transition: width 0.12s linear; }
.pbar .p0 { background: var(--ink); }
.pbar .p1 { background: var(--red); flex: 1; }
.pbar .born { position: absolute; top: 0; bottom: 0; width: 2px; margin-left: -1px; background: var(--pale); transition: left 0.2s; }
.plabels { display: flex; justify-content: space-between; align-items: center; margin-top: 7px; font-size: 13px; font-variant-numeric: tabular-nums; color: var(--muted); }
.plabels b { font-weight: 600; color: var(--ink); }
.sw { display: inline-block; width: 8px; height: 7px; border-radius: 50%; vertical-align: 1px; margin: 0 6px; }
.sw.zero { background: var(--ink); }
.sw.one { background: var(--red); }
.pov { font: italic 300 15px var(--serif); margin-top: 8px; color: var(--muted); }
.pov strong { font: 500 13.5px var(--sans); color: var(--ink); font-style: normal; }
.meters { display: grid; gap: 7px; margin-top: 11px; }
.meter { display: grid; grid-template-columns: 82px 1fr; align-items: center; font-size: 12.5px; color: var(--muted); }
.meter .track { height: 4px; border-radius: 2px; overflow: hidden; background: var(--track); }
.meter i { display: block; height: 100%; width: 0; background: var(--ink); transition: width 0.12s linear; }
.meter i.y { background: var(--pale); box-shadow: inset 0 0 0 1px var(--line); }

.kets { display: flex; flex-wrap: wrap; gap: 6px; }
.kbtn, .abtn {
  min-width: 48px; height: 36px; padding: 0 10px; font: 400 17px var(--math); border: 1px solid var(--line);
  border-radius: 18px; background: transparent; cursor: pointer; transition: background 0.2s, border-color 0.2s, transform 0.12s;
}
@media (hover: hover) { .kbtn:hover, .abtn:not(.active):hover { border-color: var(--ink); background: var(--card); } }
.kbtn:active, .abtn:active { transform: scale(0.96); }
.axes { display: flex; align-items: center; gap: 6px; }
.axes span { font: italic 300 15px var(--serif); margin-right: auto; color: var(--muted); }
.abtn { min-width: 40px; font-style: italic; }
.abtn.active { background: var(--ink); color: var(--pale); border-color: var(--ink); }
:root[data-theme="night"] .abtn.active { color: #121f46; }

.slider { display: block; margin-top: 12px; }
.slider span { font: italic 300 15px var(--serif); color: var(--muted); }
.slider small { font-size: 13px; }
.shots { display: flex; align-items: center; gap: 12px; margin: 10px 0 12px; }
.shots .slider { flex: 1; margin: 0; }
.play { width: 38px; height: 38px; flex: none; border-radius: 50%; border: 1px solid var(--red); background: var(--red); cursor: pointer; display: grid; place-items: center; }
.play[aria-pressed="false"] { background: transparent; border-color: var(--line); }
.i-pause { width: 10px; height: 12px; border-left: 3px solid #fff; border-right: 3px solid #fff; }
.play[aria-pressed="false"] .i-pause { width: 0; height: 0; border-style: solid; border-width: 7px 0 7px 11px; border-color: transparent transparent transparent var(--ink); margin-left: 3px; }
.note { font-size: 11.5px; color: var(--muted); margin-top: 7px; }

input[type="range"] { -webkit-appearance: none; appearance: none; width: 100%; height: 26px; background: transparent; cursor: pointer; touch-action: pan-y; }
input[type="range"]:focus-visible { outline: 1px dashed var(--ink); outline-offset: 2px; }
input[type="range"]::-webkit-slider-runnable-track { height: 2px; border-radius: 1px; background: var(--line); }
input[type="range"]::-moz-range-track { height: 2px; border-radius: 1px; background: var(--line); }
input[type="range"]::-webkit-slider-thumb { -webkit-appearance: none; width: 16px; height: 15px; margin-top: -7px; border-radius: 50%; background: var(--ink); border: 0; }
input[type="range"]::-moz-range-thumb { width: 16px; height: 15px; border-radius: 50%; background: var(--ink); border: 0; }

/* ---------- dock ---------- */
.dock { position: fixed; left: 210px; right: 360px; bottom: 18px; display: flex; flex-direction: column; align-items: center; gap: 12px; z-index: 4; pointer-events: none; }
.dock > * { pointer-events: auto; }
/* wide screens: the hint is a quiet note in the margin */
.hint { position: fixed; left: 30px; top: 118px; width: min(250px, 18vw); font: italic 300 18px/1.35 var(--serif); color: var(--muted); transition: opacity 0.6s; pointer-events: none; text-wrap: pretty; }
.hint::before { content: ""; display: block; width: 7px; height: 6px; border-radius: 50%; background: var(--red); margin-bottom: 12px; }
.hint.fade { opacity: 0; }
.row { display: flex; gap: 10px; align-items: center; }
.modes { display: flex; padding: 3px; gap: 2px; border: 1px solid var(--line); border-radius: 30px; background: var(--card); backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px); box-shadow: var(--soft); }
.mode { display: flex; flex-direction: column; align-items: flex-start; border: 0; background: transparent; border-radius: 26px; padding: 8px 22px 9px 20px; cursor: pointer; transition: background 0.35s, color 0.35s; }
.mode b { font: 400 19px/1 var(--serif); }
.mode small { font: italic 300 13.5px/1 var(--serif); opacity: 0.75; margin-top: 4px; }
.mode.active[data-mode="manip"] { background: var(--ink); color: var(--pale); }
:root[data-theme="night"] .mode.active[data-mode="manip"] { color: #121f46; }
.mode.active[data-mode="measure"] { background: var(--red); color: #fff; }
.look { display: flex; align-items: center; gap: 9px; height: 52px; padding: 0 20px 0 16px; border: 1px solid var(--line); border-radius: 26px; background: var(--card); cursor: pointer; font: italic 400 18px var(--serif); backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px); box-shadow: var(--soft); transition: transform 0.12s, border-color 0.2s; }
@media (hover: hover) { .look:hover { border-color: var(--ink); } }
.look:active { transform: scale(0.96); }
.eye-ico { width: 18px; height: 18px; border: 1.4px solid var(--ink); border-radius: 50%; position: relative; }
.eye-ico::after { content: ""; position: absolute; left: 50%; top: 50%; width: 6px; height: 6px; margin: -3px 0 0 -3px; border-radius: 50%; background: var(--ink); }
.look.flash .eye-ico::after { animation: lookflash 0.5s; }
@keyframes lookflash { 30% { transform: scale(1.8); background: var(--red); } }

.zurek { width: min(640px, 100%); }
.ztop, .zbot { display: flex; justify-content: space-between; align-items: baseline; font: italic 300 14.5px var(--serif); color: var(--muted); }
.ztop strong { font: 500 13.5px var(--sans); font-style: normal; color: var(--ink); }
.zbot { margin-top: -3px; }
#size::-webkit-slider-runnable-track { height: 3px; background: linear-gradient(90deg, var(--ink), rgba(127, 127, 127, 0.55)); }
#size::-moz-range-track { height: 3px; background: linear-gradient(90deg, var(--ink), rgba(127, 127, 127, 0.55)); }
#size::-webkit-slider-thumb { width: 20px; height: 18px; margin-top: -8px; background: var(--ink); }
#size::-moz-range-thumb { width: 20px; height: 18px; background: var(--ink); }

/* ---------- camera ---------- */
.cam { position: fixed; left: 24px; bottom: 24px; width: 156px; height: 117px; border: 1px solid var(--line); border-radius: 14px; overflow: hidden; z-index: 4; box-shadow: var(--soft); background: var(--ink); }
.cam[hidden] { display: none; }
.cam video { width: 100%; height: 100%; object-fit: cover; transform: scaleX(-1); filter: grayscale(0.7) contrast(1.05) brightness(1.05); opacity: 0.9; }

/* ---------- toast ---------- */
.toast { position: fixed; left: 50%; top: 20px; transform: translate(-50%, -220%); z-index: 20; padding: 9px 18px; border: 1px solid var(--line); border-radius: 18px; background: var(--card-strong); font: italic 400 16px var(--serif); box-shadow: var(--soft); backdrop-filter: blur(12px); transition: transform 0.45s cubic-bezier(.2,.9,.3,1.1); pointer-events: none; white-space: nowrap; }
.toast.show { transform: translate(-50%, 0); }

/* ---------- intro ---------- */
.intro { position: fixed; inset: 0; z-index: 30; display: grid; place-items: center; padding: 20px; background: color-mix(in srgb, var(--field) 40%, transparent); backdrop-filter: blur(6px); -webkit-backdrop-filter: blur(6px); transition: opacity 0.9s, visibility 0.9s; }
.intro.gone { opacity: 0; visibility: hidden; }
.intro-card { max-width: 540px; text-align: center; padding: 38px 36px 28px; background: var(--card-strong); border: 1px solid var(--line); border-radius: 22px; box-shadow: 0 20px 60px rgba(15, 21, 38, 0.18); }
.kicker { font: italic 300 17px var(--serif); color: var(--muted); }
.intro h2 { font-family: var(--serif); font-variation-settings: "SOFT" 60; font-weight: 400; font-size: clamp(44px, 7.5vw, 72px); line-height: 0.98; letter-spacing: -0.02em; margin: 10px 0 16px; }
.intro h2 em { font-style: italic; font-weight: 300; color: var(--red); }
.lede { font-size: 16px; line-height: 1.5; color: var(--muted); text-wrap: balance; }
.intro-actions { display: flex; flex-direction: column; gap: 9px; margin: 24px auto 18px; max-width: 340px; }
.big { height: 48px; border-radius: 24px; border: 1px solid var(--ink); background: var(--ink); color: var(--pale); font: italic 400 18px var(--serif); cursor: pointer; transition: opacity 0.2s; }
:root[data-theme="night"] .big { color: #121f46; }
@media (hover: hover) { .big:hover { opacity: 0.88; } }
.big.ghost { background: transparent; color: var(--ink); border-color: var(--line); }
.credits { font: italic 400 16px var(--serif); }
.fine { font-size: 12px; color: var(--muted); margin-top: 6px; line-height: 1.45; }
.intro-card > * { animation: rise 1s both cubic-bezier(.2,.8,.2,1); }
.intro-card > :nth-child(2) { animation-delay: 0.08s; } .intro-card > :nth-child(3) { animation-delay: 0.16s; }
.intro-card > :nth-child(4) { animation-delay: 0.24s; } .intro-card > :nth-child(n+5) { animation-delay: 0.32s; }
@keyframes rise { from { opacity: 0; transform: translateY(12px); } }

/* ---------- dialogs ---------- */
.sheet { position: fixed; margin: auto; max-width: 620px; width: calc(100% - 32px); max-height: calc(100% - 40px); padding: 28px 30px 24px; color: var(--ink); background: var(--card-strong); border: 1px solid var(--line); border-radius: 20px; box-shadow: 0 20px 60px rgba(15, 21, 38, 0.2); overflow: auto; backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px); }
.sheet::backdrop { background: rgba(10, 16, 32, 0.28); }
.sheet h3 { font: 400 28px var(--serif); margin-bottom: 14px; }
.sheet h4 { font: italic 400 18px var(--serif); margin: 14px 0 6px; }
.sheet p { font-size: 14.5px; line-height: 1.6; margin-bottom: 10px; }
.sheet .m { font-family: var(--math); white-space: nowrap; }
.sheet .credits { margin-top: 12px; }
.keys { font-size: 13px !important; line-height: 2.05 !important; color: var(--muted); }
kbd { display: inline-block; min-width: 22px; padding: 0 6px; border: 1px solid var(--line); border-radius: 6px; font: 500 12px var(--sans); text-align: center; color: var(--ink); line-height: 20px; }
.close { position: absolute; right: 14px; top: 10px; width: 36px; height: 36px; border: 0; background: transparent; font-size: 26px; font-weight: 300; cursor: pointer; }
.qr { text-align: center; max-width: 440px; }
.qr canvas { width: min(340px, 100%); height: auto; aspect-ratio: 1; image-rendering: pixelated; border-radius: 12px; }
.qr .url { font: italic 400 18px var(--serif); word-break: break-all; margin-top: 10px; }

/* ---------- presentation mode ---------- */
.brand, .sensors, .panel, .dock, .cam { transition: opacity 0.5s; }
body.clean .brand, body.clean .sensors, body.clean .panel, body.clean .dock, body.clean .cam { opacity: 0; pointer-events: none; }
body.clean .panel *, body.clean .dock * { pointer-events: none; }

/* ---------- phones ---------- */
@media (max-width: 759px) {
  .brand { left: 16px; top: 13px; }
  .brand h1 { font-size: 19px; line-height: 1.02; }
  .brand h1 em { display: block; }
  .brand p { display: none; }
  .sensors { right: 10px; top: 12px; gap: 5px; flex-wrap: nowrap; }
  .chip { height: 34px; padding: 0 8px; gap: 4px; }
  .chip .lbl { display: none; }
  .chip.icon { width: 34px; }
  .chip .vu { width: 12px; }
  #btnQR { display: none; }
  .hud { display: flex; flex-direction: column; gap: 8px; position: fixed; left: 0; right: 0; bottom: 0; z-index: 4; padding: 0 10px calc(10px + env(safe-area-inset-bottom)); pointer-events: none; }
  .hud > * { pointer-events: auto; }
  .panel { position: static; width: auto; max-height: none; overflow: visible; gap: 8px; }
  .dock { position: static; gap: 8px; }
  .card { padding: 10px 12px 11px; border-radius: 14px; }
  .card h2, .meters, .note, .energy, .pov { display: none; }
  .ketline { font-size: 16px; min-height: 0; margin-bottom: 8px; }
  .ketline small { font-size: 13.5px; display: inline; margin-left: 6px; }
  .plabels { font-size: 12px; margin-top: 5px; }
  .kets { flex-wrap: nowrap; justify-content: space-between; gap: 5px; }
  .kbtn { min-width: 0; flex: 1; height: 34px; font-size: 15.5px; padding: 0 4px; }
  .card.meas { display: grid; grid-template-columns: 1fr auto; column-gap: 10px; align-items: center; }
  .card.meas .axes span, .card.meas .shots .slider { display: none; }
  .card.meas .shots { margin: 0; }
  .card.meas .pbar, .card.meas .plabels { grid-column: 1 / -1; }
  .card.meas .pbar { margin-top: 10px; }
  .abtn { flex: 1; height: 36px; }
  .hint { position: static; width: auto; font-size: 14.5px; line-height: 1.2; height: 2.4em; overflow: hidden; text-align: center; display: flex; align-items: center; justify-content: center; }
  .hint::before { display: none; }
  .row { width: 100%; gap: 8px; }
  .modes { flex: 1; }
  .mode { flex: 1; padding: 7px 12px; }
  .mode b { font-size: 17px; }
  .mode small { font-size: 12.5px; }
  .look { height: 48px; padding: 0 14px 0 12px; font-size: 16px; }
  .zurek { width: 100%; }
  .ztop strong { font-size: 12.5px; }
  .ztop span:first-child, .ztop span:last-child { display: none; }
  .ztop { justify-content: center; }
  .cam { left: auto; right: 12px; bottom: auto; top: 56px; width: 84px; height: 63px; border-radius: 10px; }
  .intro-card { padding: 28px 20px 22px; }
}
@media (max-width: 759px) and (max-height: 700px) {
  .hint, .ztop, .zbot span:nth-child(2) { display: none; }
  .ketline { font-size: 14.5px; }
  .ketline small { display: none; }
}
@media (max-height: 560px) and (min-width: 760px) {
  .brand p, .meters, .note, .hint { display: none; }
}
@media (prefers-reduced-motion: reduce) {
  .intro-card > * { animation: none; }
}