:root {
  --night: #071b24;
  --deep: #06141b;
  --milk: #f4f1de;
  --muted: #b8c8c6;
  --lime: #d8ff52;
  --coral: #ff6b5e;
  --cyan: #56d8e6;
  --line: rgba(244, 241, 222, 0.22);
  --serif: Georgia, "Times New Roman", serif;
  --sans: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; background: var(--night); }
body { margin: 0; overflow-x: hidden; background: radial-gradient(circle at 74% 5%, rgba(86,216,230,0.13), transparent 34%), linear-gradient(160deg, var(--night), var(--deep)); color: var(--milk); font-family: var(--sans); }
button, select, input { font: inherit; }
a { color: inherit; }
:focus-visible { outline: 3px solid var(--lime); outline-offset: 4px; }
.skip-link { position: fixed; z-index: 100; top: 12px; left: 12px; padding: 12px 15px; background: var(--lime); color: var(--deep); transform: translateY(-160%); }
.skip-link:focus { transform: translateY(0); }
.ambient { position: fixed; z-index: -1; inset: 0; pointer-events: none; overflow: hidden; }
.ambient span { position: absolute; width: 42vw; height: 42vw; border: 1px solid rgba(86,216,230,0.1); border-radius: 50%; animation: float 18s ease-in-out infinite alternate; }
.ambient span:nth-child(1) { top: 12%; left: -18%; }
.ambient span:nth-child(2) { top: 45%; right: -20%; animation-delay: -8s; }
.ambient span:nth-child(3) { bottom: -30%; left: 28%; animation-delay: -13s; }

.topbar, main > section, footer { width: min(1220px, calc(100% - 48px)); margin-inline: auto; }
.topbar { min-height: 78px; display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; gap: 22px; border-bottom: 1px solid var(--line); font-size: 0.63rem; letter-spacing: 0.16em; text-transform: uppercase; }
.topbar p { margin: 0; color: var(--muted); }
.topbar a { text-decoration: none; }
.brand { font-weight: 700; }
.brand b { color: var(--lime); }
.brand span { color: var(--coral); }
.topbar nav { justify-self: end; display: flex; gap: 22px; }
.topbar nav a:hover { color: var(--lime); }

.hero { position: relative; min-height: calc(100svh - 78px); display: flex; flex-direction: column; justify-content: center; padding-block: 90px 64px; }
.kicker, .label { margin: 0; color: var(--lime); font-size: 0.66rem; font-weight: 800; letter-spacing: 0.2em; text-transform: uppercase; }
.kicker { display: flex; align-items: center; gap: 12px; }
.kicker span { width: 40px; height: 1px; background: linear-gradient(90deg, var(--lime), var(--cyan)); }
.hero h1 { position: relative; z-index: 1; margin: 20px 0 46px; font: 400 clamp(4.6rem, 11vw, 10.4rem)/0.8 var(--serif); letter-spacing: -0.07em; }
.hero h1 em { color: var(--coral); font-weight: inherit; }
.hero-bottom { position: relative; z-index: 1; display: grid; grid-template-columns: minmax(0, 570px) auto; justify-content: space-between; align-items: end; gap: 40px; }
.hero-bottom p { margin: 0; color: var(--muted); font-size: clamp(1rem, 1.7vw, 1.2rem); line-height: 1.75; }
.hero-bottom a { padding: 14px 0; border-bottom: 1px solid var(--lime); font-size: 0.7rem; font-weight: 800; letter-spacing: 0.15em; text-decoration: none; text-transform: uppercase; }
.hero-bottom a span { margin-left: 24px; color: var(--lime); }
.choir-mark { position: absolute; top: 8%; right: -2%; width: min(47vw, 550px); height: 72%; display: flex; align-items: center; justify-content: space-around; opacity: 0.33; mask-image: linear-gradient(to bottom, transparent, #000 18%, #000 82%, transparent); }
.choir-mark i { width: clamp(2px, 0.4vw, 5px); height: var(--h); border-radius: 999px; background: linear-gradient(var(--cyan), var(--lime), var(--coral)); box-shadow: 0 0 28px var(--cyan); animation: sing 3.8s ease-in-out var(--d) infinite alternate; }

.band { display: grid; grid-template-columns: minmax(170px, 0.48fr) minmax(0, 1.52fr); gap: 50px; padding-block: 112px; border-top: 1px solid var(--line); }
.band h2, .section-head h2 { margin: 0; font: 400 clamp(2.7rem, 5.8vw, 5.6rem)/0.94 var(--serif); letter-spacing: -0.05em; }
.band > div > p { max-width: 730px; color: var(--muted); font-size: 1.05rem; line-height: 1.8; }

.tuner, .formats { padding-block: 112px; border-top: 1px solid var(--line); }
.section-head { display: grid; grid-template-columns: 1fr 0.55fr; align-items: end; gap: 40px; margin-bottom: 54px; }
.section-head .label { margin-bottom: 18px; }
.section-head > p { margin: 0; color: var(--muted); line-height: 1.7; }
.tuner-grid { display: grid; grid-template-columns: minmax(300px, 0.8fr) minmax(0, 1.2fr); border: 1px solid var(--line); background: rgba(3,14,20,0.34); }
.voice-form { padding: 30px; border-right: 1px solid var(--line); }
.field { margin-bottom: 28px; }
.field > label, .field legend { display: block; margin-bottom: 10px; color: var(--muted); font-size: 0.65rem; font-weight: 800; letter-spacing: 0.14em; text-transform: uppercase; }
select { width: 100%; min-height: 48px; border: 0; border-bottom: 1px solid var(--line); border-radius: 0; padding: 10px 34px 10px 0; background: var(--deep); color: var(--milk); }
fieldset { margin: 0; padding: 0; border: 0; }
.registers { display: grid; grid-template-columns: repeat(3, 1fr); gap: 7px; }
.registers input { position: absolute; opacity: 0; pointer-events: none; }
.registers span { min-height: 46px; display: grid; place-items: center; border: 1px solid var(--line); cursor: pointer; font-size: 0.75rem; }
.registers input:checked + span { border-color: var(--lime); background: var(--lime); color: var(--deep); font-weight: 800; }
.registers input:focus-visible + span { outline: 3px solid var(--lime); outline-offset: 3px; }
.intensity label { display: flex; justify-content: space-between; gap: 18px; }
.intensity output { color: var(--lime); }
input[type="range"] { width: 100%; accent-color: var(--lime); }
.intensity > div { display: flex; justify-content: space-between; color: rgba(244,241,222,0.45); font-size: 0.58rem; }
.primary { width: 100%; min-height: 50px; border: 1px solid var(--lime); background: var(--lime); color: var(--deep); cursor: pointer; font-weight: 800; }
.primary:hover { background: transparent; color: var(--lime); }
.score { min-height: 600px; display: flex; flex-direction: column; }
.score-head { display: flex; justify-content: space-between; align-items: center; gap: 20px; padding: 27px 30px; border-bottom: 1px solid var(--line); }
.score-head h3 { margin: 0; font: 400 1.6rem/1 var(--serif); }
.score-head span { color: var(--coral); font-size: 0.65rem; letter-spacing: 0.13em; text-transform: uppercase; }
.voice-field { flex: 1; display: flex; flex-direction: column; justify-content: center; gap: 18px; padding: 34px; overflow: hidden; background-image: repeating-linear-gradient(to bottom, transparent 0 52px, rgba(244,241,222,0.06) 53px); }
.empty { color: var(--muted); font-style: italic; text-align: center; }
.voice { --voice-color: var(--cyan); position: relative; margin: 0; padding-left: calc(24px + var(--distance)); color: var(--milk); font: 400 clamp(1rem, 2vw, 1.35rem)/1.45 var(--serif); animation: enter 0.5s ease both; }
.voice::before { content: ""; position: absolute; top: 0.7em; left: 0; width: calc(12px + var(--distance)); height: 2px; background: var(--voice-color); box-shadow: 0 0 14px var(--voice-color); }
.voice small { display: block; margin-top: 4px; color: var(--voice-color); font: 700 0.53rem/1.3 var(--sans); letter-spacing: 0.14em; text-transform: uppercase; }
.score-actions { display: flex; flex-wrap: wrap; gap: 7px; padding: 22px 24px; border-top: 1px solid var(--line); }
.score-actions button { min-height: 44px; border: 1px solid var(--line); padding: 9px 12px; background: transparent; color: var(--milk); cursor: pointer; }
.score-actions button:hover { border-color: var(--lime); color: var(--lime); }
.score-actions #reset { margin-left: auto; color: var(--coral); }
.status { min-height: 1.4em; color: var(--lime); }

.protocol ol { margin: 42px 0 0; padding: 0; list-style: none; }
.protocol li { display: grid; grid-template-columns: 56px 1fr; gap: 20px; padding: 21px 0; border-top: 1px solid var(--line); }
.protocol li > b { color: var(--lime); font: 400 1.3rem/1 var(--serif); }
.protocol h3 { margin: 0 0 6px; font: 400 1.45rem/1.2 var(--serif); }
.protocol li p { margin: 0; color: var(--muted); line-height: 1.65; }
.format-grid { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.format-grid article { position: relative; min-height: 330px; padding: 28px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); overflow: hidden; }
.format-grid small { color: var(--lime); letter-spacing: 0.17em; }
.format-grid h3 { max-width: 260px; margin: 90px 0 12px; font: 400 1.8rem/1.05 var(--serif); }
.format-grid p { max-width: 300px; margin: 0; color: var(--muted); line-height: 1.65; }
.format-grid article > span { position: absolute; right: 10px; bottom: -28px; color: transparent; -webkit-text-stroke: 1px rgba(216,255,82,0.16); font: 400 8rem/1 var(--serif); }
.faq details { border-top: 1px solid var(--line); }
.faq details:last-child { border-bottom: 1px solid var(--line); }
.faq summary { padding: 20px 32px 20px 0; cursor: pointer; font-weight: 750; }
.faq details p { margin: 0 0 22px; color: var(--muted); line-height: 1.7; }
.closing { padding-block: 130px; border-top: 1px solid var(--line); text-align: center; }
.closing .label { margin-bottom: 20px; }
.closing h2 { margin: 0; font: 400 clamp(3rem, 7.5vw, 7rem)/0.9 var(--serif); letter-spacing: -0.055em; }
.closing > p { max-width: 620px; margin: 28px auto; color: var(--muted); line-height: 1.7; }
.closing > div { display: flex; justify-content: center; flex-wrap: wrap; gap: 10px; }
.closing span, .closing a { padding: 14px 17px; border: 1px solid var(--line); }
.closing span { color: rgba(244,241,222,0.5); cursor: not-allowed; }
.closing a { border-color: var(--lime); color: var(--lime); text-decoration: none; }
footer { min-height: 130px; display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; gap: 22px; border-top: 1px solid var(--line); color: rgba(244,241,222,0.5); font-size: 0.62rem; letter-spacing: 0.09em; }
footer p { color: var(--milk); font-weight: 800; }
footer a { justify-self: end; }

@keyframes sing { to { height: calc(var(--h) * 0.64); filter: hue-rotate(32deg); } }
@keyframes float { to { transform: translate(14vw, -8vh) scale(1.16); } }
@keyframes enter { from { opacity: 0; transform: translateX(-24px); } }
@media (max-width: 850px) {
  .topbar, main > section, footer { width: min(100% - 30px, 720px); }
  .topbar { grid-template-columns: 1fr 1fr; }
  .topbar p { display: none; }
  .band, .section-head { grid-template-columns: 1fr; gap: 24px; }
  .tuner-grid { grid-template-columns: 1fr; }
  .voice-form { border-right: 0; border-bottom: 1px solid var(--line); }
  .format-grid { grid-template-columns: 1fr; }
  .hero-bottom { grid-template-columns: 1fr; align-items: start; }
  .hero-bottom a { width: fit-content; }
  footer { grid-template-columns: 1fr; padding-block: 30px; }
  footer a { justify-self: start; }
}
@media (max-width: 520px) {
  .topbar nav a:last-child { display: none; }
  .hero h1 { font-size: clamp(3.75rem, 20vw, 5.4rem); }
  .band, .tuner, .formats { padding-block: 78px; }
  .choir-mark { width: 72vw; opacity: 0.2; }
  .registers { grid-template-columns: 1fr; }
  .voice-form, .voice-field { padding: 22px 18px; }
  .score-actions #reset { margin-left: 0; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
}
@media (prefers-contrast: more) {
  :root { --muted: #fff; --line: rgba(255,255,255,0.7); }
}