/* CoughIt site, minimal-art look shared with the app (variant A):
   white paper, ink, pure grays, square corners, heavy rules.
   Red is the only hue and is reserved for "a cough was caught". */

:root {
  --paper: #ffffff;
  --ink: #111111;
  --ink-2: #444444;
  --muted: #666666;
  --hairline: #dadada;
  --alert: #e5303f;

  --rule: 1.5px;
  --gutter: clamp(20px, 5vw, 64px);
  --max: 1240px;
  --hero-circle: clamp(120px, 16vw, 200px);

  --font: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Inter", "Helvetica Neue", Arial, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; padding: 0; }

html { scroll-behavior: smooth; scroll-padding-top: 72px; }

body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font);
  font-size: 18px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: inherit; }

:focus-visible {
  outline: 3px solid var(--ink);
  outline-offset: 3px;
}

.skip {
  position: absolute;
  left: var(--gutter);
  top: -80px;
  padding: 10px 16px;
  background: var(--ink);
  color: var(--paper);
  z-index: 20;
  text-decoration: none;
}
.skip:focus { top: 12px; }

/* ---------- Top bar ---------- */
.top {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  padding: 0 var(--gutter);
  background: var(--paper);
  border-bottom: var(--rule) solid var(--ink);
}

.wordmark {
  flex: none;
  margin-right: clamp(28px, 4vw, 48px);
  font-size: 22px;
  font-weight: 800;
  letter-spacing: -0.02em;
  text-decoration: none;
}

.top-nav {
  display: flex;
  min-width: 0;
  gap: clamp(18px, 3vw, 36px);
  overflow-x: auto;
  white-space: nowrap;
  scrollbar-width: none;
}
.top-nav::-webkit-scrollbar { display: none; }

.top-nav a {
  font-size: 16px;
  font-weight: 500;
  text-decoration: none;
  color: var(--ink-2);
  padding: 8px 0;
  border-bottom: 2px solid transparent;
}
.top-nav a:hover { color: var(--ink); border-bottom-color: var(--ink); }

/* ---------- Hero ---------- */
.hero {
  max-width: var(--max);
  margin: 0 auto;
  padding: clamp(48px, 9vh, 104px) var(--gutter) clamp(56px, 10vh, 112px);
}

.tagline {
  font-weight: 800;
  line-height: 1.02;
  letter-spacing: -0.04em;
}
.tagline-title {
  display: block;
  font-size: clamp(3.6rem, 9vw, 7.4rem);
}
.tagline-sub {
  display: block;
  max-width: 18em;
  margin-top: 0.18em;
  font-size: clamp(1.75rem, 4.2vw, 3.8rem);
  line-height: 1.08;
  letter-spacing: -0.035em;
}

/* The app's own start button, replayed under the tagline. */
.listen {
  display: flex;
  align-items: center;
  gap: clamp(24px, 4vw, 48px);
  margin-top: clamp(40px, 7vh, 80px);
}

.listen-stage {
  position: relative;
  width: var(--hero-circle);
  height: var(--hero-circle);
}

.listen-circle,
.listen-pulse {
  position: absolute;
  inset: 0;
  border-radius: 50%;
}

.listen-circle {
  display: grid;
  place-items: center;
  background: var(--paper);
  border: 2px solid var(--ink);
  transition: border-color 0.25s ease;
}

/* The mark: hollow ring when idle, filled dot while listening, red on a cough. */
.listen-mark {
  width: 19%;
  height: 19%;
  border-radius: 50%;
  border: 2px solid var(--ink);
  background: transparent;
  transition: background-color 0.25s ease, border-color 0.25s ease;
}

.listen-pulse {
  border: 1.5px solid var(--ink);
  opacity: 0;
}

.listen-stage[data-state="listening"] .listen-mark,
.listen-stage[data-state="cough"] .listen-mark {
  background: var(--ink);
  animation: breathe 1.4s ease-in-out infinite;
}

.listen-stage[data-state="listening"] .listen-pulse,
.listen-stage[data-state="cough"] .listen-pulse {
  animation: ring 1.4s ease-out infinite;
}

.listen-stage[data-state="cough"] .listen-circle { border-color: var(--alert); }
.listen-stage[data-state="cough"] .listen-mark { background: var(--alert); border-color: var(--alert); }
.listen-stage[data-state="cough"] .listen-pulse { border-color: var(--alert); }

@keyframes breathe {
  0%, 100% { transform: scale(0.86); }
  50%      { transform: scale(1.1); }
}

@keyframes ring {
  0%   { transform: scale(1);    opacity: 0.55; }
  100% { transform: scale(1.24); opacity: 0; }
}

.listen-caption {
  font-size: clamp(18px, 2.2vw, 24px);
  font-weight: 500;
  line-height: 1.35;
  max-width: 14em;
  min-height: 2.7em;
}
.app-store-link {
  display: inline-flex;
  line-height: 0;
}
.app-store-link img {
  display: block;
  width: 180px;
  height: auto;
}
.app-store-link:focus-visible {
  outline: 3px solid #1d154a;
  outline-offset: 5px;
}

/* ---------- Blocks ---------- */
.block {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--gutter) clamp(56px, 9vh, 104px);
}

.block-head {
  display: flex;
  align-items: baseline;
  gap: 18px;
  padding-top: 20px;
  margin-bottom: clamp(24px, 4vh, 44px);
  border-top: var(--rule) solid var(--ink);
}

.block-no {
  font-size: 16px;
  font-weight: 700;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

.block-title {
  font-size: clamp(1.7rem, 3.4vw, 2.5rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.1;
}

.prose { max-width: 40rem; }
.prose p { font-size: clamp(1.15rem, 1.8vw, 1.4rem); line-height: 1.6; }
.prose p + p { margin-top: 1em; }

.section-intro {
  max-width: 48rem;
  margin-bottom: clamp(28px, 4vh, 48px);
}
.section-intro p {
  font-size: clamp(1.15rem, 1.8vw, 1.45rem);
  line-height: 1.55;
  color: var(--ink-2);
}
.section-intro p + p { margin-top: 1em; }

.content-copyright {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--gutter) 32px;
  color: var(--muted);
  font-size: 14px;
}

/* ---------- Interactive co-creation demos ---------- */
.demo-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}

.music-demo {
  display: flex;
  flex-direction: column;
  min-width: 0;
  padding: clamp(20px, 3vw, 32px);
  border: var(--rule) solid var(--ink);
  background: var(--paper);
}

.demo-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 20px;
}

.demo-kicker {
  margin-bottom: 4px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.demo-head h3 {
  font-size: clamp(1.45rem, 2.4vw, 2rem);
  line-height: 1.1;
  letter-spacing: -0.03em;
}

.demo-play {
  flex: none;
  min-width: 76px;
  height: 44px;
  padding: 0 16px;
  border: var(--rule) solid var(--ink);
  background: var(--ink);
  color: var(--paper);
  font: inherit;
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
}
.demo-play:hover { background: var(--paper); color: var(--ink); }

.demo-copy {
  margin-top: 18px;
  color: var(--ink-2);
  font-size: 16px;
  line-height: 1.55;
}

.translation-list {
  display: grid;
  gap: 10px;
  margin: 28px 0 32px;
  max-height: 204px;
  padding-right: 8px;
  overflow-y: auto;
  overscroll-behavior: contain;
  scrollbar-color: var(--ink) #e7e7e3;
  scrollbar-width: thin;
}
.translation-list::-webkit-scrollbar { width: 8px; }
.translation-list::-webkit-scrollbar-track { background: #e7e7e3; }
.translation-list::-webkit-scrollbar-thumb { background: var(--ink); }

.translation-list::after {
  content: '';
  height: 30px;
}

.translation {
  display: grid;
  grid-template-columns: 38px minmax(180px, 0.85fr) 28px minmax(300px, 1.55fr);
  align-items: center;
  gap: 10px;
  padding: 10px;
  border: 1px solid var(--hairline);
  background: #fafaf8;
  min-height: 126px;
}

.translation-no {
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
  text-align: center;
  letter-spacing: 0.08em;
}

.sample-panel {
  min-width: 0;
}

.translation button {
  display: inline-flex;
  align-items: center;
  justify-content: flex-start;
  gap: 9px;
  min-height: 44px;
  padding: 8px 12px;
  border: 1px solid var(--ink);
  background: var(--paper);
  color: var(--ink);
  font: inherit;
  font-size: 13px;
  font-weight: 700;
  line-height: 1.2;
  text-align: left;
  cursor: pointer;
}
.translation button:hover,
.translation button.is-playing { background: var(--ink); color: var(--paper); }
.translation button [data-play-icon] {
  width: 1em;
  flex: none;
  text-align: center;
}

.translation-arrow {
  color: var(--muted);
  font-size: 20px;
  text-align: center;
}

.sample-panel canvas {
  display: block;
  width: 100%;
  height: 58px;
  margin-top: 7px;
  border: 1px solid var(--hairline);
  background: #f7f7f5;
}

.final-label {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 8px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.final-label span + span { color: var(--muted); font-weight: 500; }

.demo-play-wide {
  width: 100%;
  margin-top: 12px;
}

.cough-inputs {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  margin: 24px 0 14px;
}

.cough-inputs button {
  min-width: 0;
  padding: 11px 8px;
  border: 1px solid var(--hairline);
  background: #f7f7f5;
  color: var(--ink);
  font: inherit;
  font-size: 13px;
  font-weight: 700;
  cursor: pointer;
}
.cough-inputs button span {
  display: block;
  color: var(--muted);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.12em;
}
.cough-inputs button:nth-child(1) { border-bottom: 3px solid var(--alert); }
.cough-inputs button:nth-child(2) { border-bottom: 3px solid var(--ink); }
.cough-inputs button:nth-child(3) { border-bottom: 3px solid #777; }
.cough-inputs button:hover,
.cough-inputs button.is-active { background: var(--ink); color: var(--paper); }
.cough-inputs button.is-active span { color: #ccc; }

.midi-frame {
  position: relative;
  border: 1px solid var(--hairline);
  background: #f7f7f5;
  overflow: hidden;
}
.midi-frame canvas {
  display: block;
  width: 100%;
  height: 136px;
  cursor: crosshair;
}
.midi-status {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  color: var(--muted);
  font-size: 13px;
}
.midi-status[hidden] { display: none; }

.demo-timeline {
  height: 3px;
  margin-top: 12px;
  background: var(--hairline);
  overflow: hidden;
}
.demo-timeline span {
  display: block;
  width: 0;
  height: 100%;
  background: var(--ink);
}

/* ---------- Player ---------- */
.player {
  border: var(--rule) solid var(--ink);
  background: var(--paper);
}

.player-stage {
  position: relative;
  aspect-ratio: 16 / 9;
  overflow: hidden;
}

.player-media { display: block; width: 100%; height: 100%; object-fit: cover; background: var(--paper); }

.player-overlay {
  position: absolute;
  inset: 0;
  margin: auto;
  width: 88px;
  height: 88px;
  border-radius: 50%;
  border: 2px solid var(--ink);
  background: var(--paper);
  cursor: pointer;
  display: grid;
  place-items: center;
}
.player-overlay svg { width: 34px; height: 34px; fill: var(--ink); margin-left: 4px; }
.player-overlay:hover { background: var(--ink); }
.player-overlay:hover svg { fill: var(--paper); }
.player-overlay svg[hidden] { display: none; }
.player.is-playing .player-overlay { opacity: 0.82; }

.player-bar {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 8px 14px;
  background: var(--paper);
  border-top: var(--rule) solid var(--ink);
}

.player-btn {
  flex: none;
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  background: transparent;
  border: 0;
  cursor: pointer;
}
.player-btn svg { width: 22px; height: 22px; fill: var(--ink); stroke: var(--ink); stroke-width: 1.6; stroke-linecap: round; }
.player-btn svg[hidden] { display: none; }
.player-btn svg .wave { fill: none; }
.player-btn:hover svg { opacity: 0.6; }

/* Thin ink track: the fill must never be the loudest thing in the frame. */
.player-track {
  position: relative;
  flex: 1;
  height: 2px;
  background: var(--hairline);
  cursor: pointer;
}
.player-track::before { content: ""; position: absolute; inset: -18px 0; } /* bigger hit area */
.player-fill { position: absolute; left: 0; top: 0; bottom: 0; width: 0; background: var(--ink); }

.player-time {
  flex: none;
  min-width: 3.2em;
  text-align: right;
  font-size: 14px;
  font-weight: 500;
  color: var(--ink-2);
  font-variant-numeric: tabular-nums;
}

/* ---------- Actions ---------- */
.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: clamp(28px, 4vh, 44px);
}

.action {
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  min-height: 64px;
  padding: 0 22px;
  border: var(--rule) solid var(--ink);
  background: var(--paper);
  color: var(--ink);
  text-decoration: none;
  transition: background-color 0.15s ease, color 0.15s ease;
}
.action-text { font-size: 20px; font-weight: 700; letter-spacing: -0.01em; line-height: 1.25; padding: 12px 0; }
.action svg { width: 26px; height: 26px; stroke: currentColor; stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; flex: none; }

.action:hover, .action-primary { background: var(--ink); color: var(--paper); }
.action-primary:hover { background: var(--paper); color: var(--ink); }

.aside {
  margin-top: 24px;
  font-size: 16px;
  color: var(--muted);
}
.aside a { color: var(--ink); font-weight: 500; text-underline-offset: 3px; }
.aside a:hover { text-decoration-thickness: 2px; }

/* ---------- Footer ---------- */
.foot {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--gutter) 56px;
}
.foot-inner {
  padding-top: 20px;
  border-top: var(--rule) solid var(--ink);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 36px;
  font-size: 15px;
  color: var(--muted);
}
.foot a { color: var(--ink-2); text-underline-offset: 3px; }
.foot a:hover { color: var(--ink); }

/* ---------- Draft placeholders (remove class "draft" from <body> when copy is final) ---------- */
.draft .todo {
  border: 1.5px dashed var(--ink-2);
  padding: 10px 14px;
  color: var(--ink-2);
  font-size: 16px;
  line-height: 1.5;
  background: repeating-linear-gradient(135deg, #fafafa 0 8px, #fff 8px 16px);
}
body:not(.draft) .todo { display: none; }

/* ---------- Responsive ---------- */
@media (max-width: 560px) {
  body { font-size: 17px; }
  .top { height: 56px; }
  .top-nav { gap: 16px; }
  .listen { flex-direction: column; align-items: flex-start; gap: 20px; }
  .listen-caption { min-height: 1.4em; }
  .actions { flex-direction: column; }
  .action { width: 100%; }
  .player-overlay { width: 72px; height: 72px; }
  .player-time { display: none; }
}

@media (max-width: 840px) {
  .translation {
    grid-template-columns: 32px minmax(150px, 1fr) 22px minmax(210px, 1.3fr);
  }
  .translation-list { max-height: 200px; }
  .sample-panel canvas { height: 58px; }
  .midi-frame canvas { height: 124px; }
}

@media (max-width: 560px) {
  .translation {
    grid-template-columns: 28px 1fr 18px 1fr;
    gap: 6px;
    padding: 8px;
  }
  .translation button { padding: 8px; font-size: 12px; }
  .sample-panel canvas { height: 54px; }
  .translation-list { max-height: 196px; padding-right: 5px; }
  .final-label { align-items: flex-start; flex-direction: column; gap: 2px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .listen-stage[data-state] .listen-mark,
  .listen-stage[data-state] .listen-pulse { animation: none; }
}