/* Tokens — ver DESIGN.md. Encarte de LP: papel, tinta preta, uma cor especial (vermilion). */
:root {
  --paper: oklch(0.945 0.006 100);
  --paper-2: oklch(0.915 0.008 100);
  --ink: oklch(0.2 0.012 60);
  --muted: oklch(0.44 0.012 60);
  --rule: oklch(0.2 0.012 60);
  --spot: oklch(0.63 0.19 33);
  --spot-ink: oklch(0.2 0.012 60);
  --focus: oklch(0.5 0.19 33);

  --f-display: "Gambetta", "Iowan Old Style", Georgia, serif;
  --f-body: "IBM Plex Sans", "Helvetica Neue", sans-serif;
  --f-mono: "IBM Plex Mono", ui-monospace, Menlo, monospace;

  /* escala 1.333 (quarta justa), base 17px */
  --t-xs: 0.75rem;
  --t-sm: 0.875rem;
  --t-base: 1.0625rem;
  --t-md: 1.417rem;
  --t-lg: 1.889rem;
  --t-xl: clamp(2.6rem, 6.2vw, 4.48rem);

  --s: 8px;
  --gutter: clamp(16px, 4vw, 48px);
  --r-0: 0;
  --r-pill: 999px;

  --ease-out: cubic-bezier(0.22, 0.8, 0.24, 1);
  --ease-io: cubic-bezier(0.77, 0, 0.175, 1);
  --d-fast: 160ms;
  --d-mark: 450ms;
  --d-line: 600ms;
  --d-arm: 1100ms;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 400 var(--t-base) / 1.55 var(--f-body);
  /* grão de papel */
  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%3CfeColorMatrix values='0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 .06 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

a { color: inherit; text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { text-decoration-color: var(--spot); text-decoration-thickness: 2px; }
:focus-visible { outline: 2px solid var(--focus); outline-offset: 3px; }

.sleeve {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 var(--gutter) calc(var(--s) * 8);
}

/* ---- faixa de catálogo ---- */
.catalog {
  display: flex;
  justify-content: space-between;
  gap: var(--s);
  padding: calc(var(--s) * 1.5) 0;
  border-bottom: 2px solid var(--rule);
  font: 500 var(--t-xs) / 1 var(--f-mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.catalog-title { font-weight: 500; }
.catalog-end { display: flex; gap: calc(var(--s) * 2); }
.lang { display: flex; gap: 2px; }
.lang > * { padding: 0 4px; }
.lang [aria-current] { background: var(--ink); color: var(--paper); }
.lang a { text-decoration: none; color: var(--muted); }
.lang a:hover { color: var(--ink); }

/* ---- hero ---- */
.hero {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  column-gap: calc(var(--s) * 3);
  row-gap: calc(var(--s) * 6);
  padding: calc(var(--s) * 9) 0 calc(var(--s) * 10);
  border-bottom: 1px solid var(--rule);
}
.hero-copy { grid-column: 1 / span 7; align-self: center; }
.demo { grid-column: 8 / span 5; margin: 0; align-self: center; }

.brand {
  display: flex;
  align-items: center;
  gap: calc(var(--s) * 2);
  margin: 0 0 calc(var(--s) * 5);
}
.brand img {
  width: 136px;
  height: 136px;
  margin: -14px -10px -14px -14px; /* o PNG tem margem transparente do squircle */
  filter: drop-shadow(0 1px 0 oklch(0.2 0.012 60 / 0.25));
}
.brand > div { display: flex; flex-direction: column; gap: 4px; }
.brand-name { font: 600 2.4rem / 1 var(--f-display); letter-spacing: -0.01em; }
.brand-tag {
  font: 500 var(--t-xs) / 1.2 var(--f-mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

h1 {
  font: 500 var(--t-xl) / 0.98 var(--f-display);
  letter-spacing: -0.02em;
  margin: 0 0 calc(var(--s) * 3);
  text-wrap: balance;
}
h1 em { font-style: italic; font-weight: 400; }
/* Karaokê: main.js quebra o título em palavras e o marca-texto passa por elas no tempo;
   no fim só "no tempo" continua marcado. */
h1:has(.w) { isolation: isolate; }
h1 .w { position: relative; }
h1 .w::before {
  content: "";
  position: absolute;
  inset: 0.1em -0.13em 0.02em;
  z-index: -1;
  background: var(--spot);
  transform: scaleX(0);
  transform-origin: left;
}
h1 em .w::before { transform: scaleX(1); }
@media (prefers-reduced-motion: no-preference) {
  h1:not(.sing) em .w::before { transform: scaleX(0); }
  h1.sing .w::before {
    transform: scaleX(1);
    transition: transform var(--t, 240ms) linear var(--d, 0ms), opacity 500ms var(--ease-out);
  }
  h1.settled .w:not(em .w)::before { opacity: 0; }
}

.lede { font-size: var(--t-md); line-height: 1.4; max-width: 34ch; margin: 0 0 calc(var(--s) * 4); color: var(--ink); }

.cta { display: flex; flex-wrap: wrap; gap: calc(var(--s) * 1.5); }

.btn {
  display: inline-flex;
  align-items: center;
  min-height: 48px;
  padding: 0 calc(var(--s) * 2.75);
  border: 2px solid var(--ink);
  border-radius: var(--r-pill);
  font: 500 var(--t-base) / 1 var(--f-body);
  text-decoration: none;
  background: transparent;
  color: var(--ink);
  transition: background-color var(--d-fast) var(--ease-out), transform var(--d-fast) var(--ease-out);
}
.btn:hover { background: var(--paper-2); text-decoration: none; }
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--ink); color: var(--paper); }
.btn-primary:hover { background: oklch(0.3 0.012 60); }
.btn[aria-disabled="true"] { opacity: 0.45; pointer-events: none; }

.fine { font-size: var(--t-sm); color: var(--muted); margin: calc(var(--s) * 2) 0 0; }

/* Logos monocromáticas em tinta, como impressas no encarte (ambas as marcas permitem a versão de uma cor). */
.works-with {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: calc(var(--s) * 1.5) calc(var(--s) * 3);
  margin-top: calc(var(--s) * 4);
  padding-top: calc(var(--s) * 2);
  border-top: 1px solid oklch(0.2 0.012 60 / 0.25);
}
.works-label, .works-yt span {
  font: 500 var(--t-xs) / 1 var(--f-mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}
.works-with img { display: block; width: auto; }
.works-with img[src$="spotify.svg"] { height: 26px; }
.works-yt { display: inline-flex; align-items: center; gap: 10px; }
.works-yt img { height: 21px; }

/* ---- demo: o ícone animado; o selo repete a mecânica do app ---- */
.deck { position: relative; width: min(100%, 440px); margin: 0 auto; }
.disc {
  position: relative;
  width: 100%;
  aspect-ratio: 1;
  overflow: hidden;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 30%, #3a3530, #15120f 80%);
}
/* Reflexo fixo: a luz não gira com o disco. */
.disc::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: conic-gradient(from 20deg, transparent, oklch(1 0 0 / 0.06) 8%, transparent 18% 50%, oklch(1 0 0 / 0.05) 58%, transparent 68%);
  pointer-events: none;
}
.disc-grooves { position: absolute; inset: 0; width: 100%; height: 100%; animation: spin 1.8s linear infinite; }
@keyframes spin { to { transform: rotate(1turn); } }
/* Com JS, main.js dá a partida (e a parada) do disco. */
html.js .disc-grooves { animation: none; }

/* Braço da agulha: fora do disco (que corta o que passa da borda), girando em torno do pivô. */
.tonearm { position: absolute; inset: 0; width: 100%; height: 100%; overflow: visible; pointer-events: none; z-index: 2; }
.arm {
  transform-box: view-box;
  transform-origin: 396px 44px;
  filter: drop-shadow(0 2px 0 oklch(0.2 0.012 60 / 0.25));
}
html.js .deck:not(.playing) .arm { transform: rotate(-30deg); }
@media (prefers-reduced-motion: no-preference) {
  .arm { transition: transform var(--d-arm) var(--ease-io); }
}
.disc-label {
  container-type: inline-size;
  position: absolute;
  inset: 29.7%;
  z-index: 1;
  overflow: hidden;
  border-radius: 50%;
  background: var(--spot);
}
/* Como no ícone: só três linhas à vista. */
.label-window {
  height: 100%;
  -webkit-mask-image: linear-gradient(transparent 22%, #000 34%, #000 66%, transparent 78%);
  mask-image: linear-gradient(transparent 22%, #000 34%, #000 66%, transparent 78%);
}
.label-track { transition: transform var(--d-line) var(--ease-out); }
.label-bar {
  height: 6.2cqw;
  margin: 0 auto 8cqw;
  border-radius: var(--r-pill);
  background: var(--ink);
  opacity: 0.3;
  transition: height var(--d-line) var(--ease-out), opacity var(--d-line) var(--ease-out);
}
.label-bar.cur { height: 11.5cqw; opacity: 1; }

figcaption {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: calc(var(--s) * 2);
  margin-top: calc(var(--s) * 2);
  font-size: var(--t-xs);
  color: var(--muted);
  font-family: var(--f-mono);
}
figcaption p { margin: 0; max-width: 44ch; }
.fig-no { color: var(--ink); font-weight: 500; margin-right: 6px; }
.deck-toggle {
  flex: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 32px;
  padding: 0 12px;
  border: 1.5px solid var(--ink);
  border-radius: var(--r-pill);
  background: transparent;
  color: var(--ink);
  font: 500 var(--t-xs) / 1 var(--f-mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  cursor: pointer;
  transition: background-color var(--d-fast) var(--ease-out);
}
/* Ícone: pausa (duas barras) enquanto toca, play (triângulo) parado. */
.deck-toggle::before {
  content: "";
  width: 8px;
  height: 9px;
  background: linear-gradient(to right, currentColor 35%, transparent 35% 65%, currentColor 65%);
}
.deck-toggle[data-state="off"]::before { background: currentColor; clip-path: polygon(0 0, 100% 50%, 0 100%); }
.deck-toggle:hover { background: var(--paper-2); }
.deck-toggle:active { transform: translateY(1px); }

/* ---- barra de progresso: a página é a faixa, a rolagem é o tempo ---- */
.playhead { display: none; }
@supports (animation-timeline: scroll()) {
  .playhead {
    display: block;
    position: fixed;
    inset: 0 0 auto;
    z-index: 10;
    height: 3px;
    background: var(--spot);
    transform-origin: left;
    animation: playhead linear both;
    animation-timeline: scroll(root);
  }
}
@keyframes playhead { from { transform: scaleX(0); } to { transform: scaleX(1); } }

/* ---- lados ---- */
.side { padding: calc(var(--s) * 8) 0 calc(var(--s) * 4); border-bottom: 1px solid var(--rule); }

h2 {
  display: flex;
  align-items: baseline;
  gap: calc(var(--s) * 2);
  font: 500 var(--t-lg) / 1.1 var(--f-display);
  margin: 0 0 calc(var(--s) * 4);
}
.side-mark {
  font: 500 var(--t-xs) / 1 var(--f-mono);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 6px 10px;
  border: 1.5px solid var(--ink);
  border-radius: var(--r-pill);
  transform: translateY(-4px);
}

.tracklist { list-style: none; margin: 0; padding: 0; border-top: 2px solid var(--rule); }
.tracklist { isolation: isolate; }
.tracklist li {
  position: relative;
  display: grid;
  grid-template-columns: 3.2rem auto 1fr auto;
  align-items: baseline;
  gap: calc(var(--s) * 1.5);
  padding: calc(var(--s) * 1.75) calc(var(--s) * 1);
  border-bottom: 1px solid oklch(0.2 0.012 60 / 0.25);
  transition: background-color var(--d-fast) var(--ease-out);
}
.tracklist li:hover { background: oklch(0.63 0.19 33 / 0.16); }
/* A faixa no meio da tela é a "linha atual": o marca-texto entra da esquerda, como no app. */
.tracklist li::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: var(--spot);
  opacity: 0;
  transform: scaleX(0);
  transform-origin: left;
  transition: opacity 220ms var(--ease-out), transform 0s 220ms;
}
.tracklist li.cur::before {
  opacity: 1;
  transform: scaleX(1);
  transition: opacity 120ms linear, transform var(--d-mark) var(--ease-out);
}
.tracklist li.cur .no, .tracklist li.cur .meta { color: var(--ink); }
.tracklist li.cur .lead { border-color: oklch(0.2 0.012 60 / 0.6); }
.tracklist .no { font: 500 var(--t-sm) / 1 var(--f-mono); color: var(--muted); font-variant-numeric: tabular-nums; }
.tracklist .name { font-size: var(--t-md); font-family: var(--f-display); line-height: 1.25; }
.tracklist .lead { border-bottom: 1.5px dotted oklch(0.2 0.012 60 / 0.4); transform: translateY(-5px); min-width: 16px; }
.tracklist .meta { font: 400 var(--t-sm) / 1.2 var(--f-mono); color: var(--muted); text-align: right; white-space: nowrap; }

kbd {
  display: inline-block;
  min-width: 1.6em;
  padding: 1px 5px;
  margin: 0 1px;
  border: 1px solid oklch(0.2 0.012 60 / 0.55);
  border-bottom-width: 2px;
  border-radius: 4px;
  font: 500 0.8rem / 1.3 var(--f-mono);
  text-align: center;
  color: var(--ink);
  background: var(--paper);
}
.note { font-size: var(--t-sm); color: var(--muted); margin: calc(var(--s) * 2.5) 0 0; }

.install { display: grid; grid-template-columns: 1fr 1fr; gap: calc(var(--s) * 6); }
h3 {
  font: 500 var(--t-xs) / 1 var(--f-mono);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin: 0 0 calc(var(--s) * 2);
  padding-bottom: calc(var(--s) * 1.25);
  border-bottom: 2px solid var(--rule);
}
.steps { margin: 0; padding: 0; list-style: none; counter-reset: st; }
.steps li {
  counter-increment: st;
  display: grid;
  grid-template-columns: 2rem 1fr;
  gap: calc(var(--s) * 1);
  padding: calc(var(--s) * 1.25) 0;
  max-width: 52ch;
}
.steps li::before { content: counter(st) "."; font: 500 var(--t-md) / 1.2 var(--f-display); color: var(--spot); }
code { font: 400 0.9em var(--f-mono); background: var(--paper-2); padding: 1px 4px; }
.steps li > .gk { grid-column: 2; }
/* Réplica do trecho de Ajustes do Sistema, desenhada no estilo do encarte; o marca-texto aponta o botão. */
.gk {
  display: grid;
  gap: calc(var(--s) * 1);
  margin-top: calc(var(--s) * 1.5);
  padding: calc(var(--s) * 1.5);
  border: 1.5px solid var(--ink);
  font-size: var(--t-sm);
  line-height: 1.35;
}
.gk-title { font: 500 var(--t-xs) / 1 var(--f-mono); letter-spacing: 0.1em; text-transform: uppercase; color: var(--muted); }
.gk-row { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: calc(var(--s) * 1.5); }
.gk-btn {
  flex: none;
  padding: 4px 10px;
  border: 1.5px solid var(--ink);
  border-radius: 6px;
  background: var(--spot);
  font-weight: 500;
  white-space: nowrap;
}

/* ---- colofão ---- */
.colophon {
  display: grid;
  grid-template-columns: 2fr 1.4fr 1fr;
  gap: calc(var(--s) * 4);
  padding-top: calc(var(--s) * 5);
  font-size: var(--t-sm);
  color: var(--muted);
}
.colophon p { margin: 0; max-width: 44ch; }
.colophon p + p { margin-top: calc(var(--s) * 1.5); }
h4 { font: 500 var(--t-xs) / 1 var(--f-mono); letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink); margin: 0 0 calc(var(--s) * 1.25); }
.bmc { display: inline-block; }
.bmc img { display: block; height: 44px; width: auto; }

/* ---- página de texto (privacidade) ---- */
.catalog a { text-decoration: none; }
.prose { border-bottom: 0; max-width: 64ch; }
.prose h3 { margin-top: calc(var(--s) * 5); }
.prose p, .prose li { line-height: 1.55; }
.prose ul { padding-left: 1.2em; margin: 0 0 calc(var(--s) * 2); }
.prose li { margin-bottom: calc(var(--s) * 1.25); }
.prose li::marker { color: var(--spot); }

/* ---- responsivo ---- */
@media (max-width: 860px) {
  .hero-copy, .demo { grid-column: 1 / -1; }
  .hero { padding-top: calc(var(--s) * 6); }
  .install, .colophon { grid-template-columns: 1fr; }
}
@media (max-width: 560px) {
  .catalog-meta { display: none; }
  .tracklist li { grid-template-columns: 2.2rem 1fr; row-gap: 4px; }
  .tracklist .lead { display: none; }
  .tracklist .meta { grid-column: 2; text-align: left; white-space: normal; }
  .deck { width: min(100%, 320px); }
  figcaption { flex-direction: column; }
  .btn { flex: 1 1 100%; justify-content: center; }
}

@media (prefers-reduced-motion: reduce) {
  .label-track, .label-bar, .btn, .tracklist li, .tracklist li::before { transition: none; }
  .disc-grooves { animation: none; }
  .playhead { display: none; }
}