/*
 * MusicSM landing page.
 *
 * The palette, radii, typeface and glass treatment are lifted directly from the app's
 * `MusicSmPalette` (`ui/theme/Palette.kt`) so the page and the product look like the same thing.
 * The drifting aurora is the same idea as the app's ambient mode, down to the mismatched orbit
 * periods that stop the layers ever lining back up.
 */

:root {
  /* Straight from DarkPalette in ui/theme/Palette.kt. */
  --bg: #121318;
  --surface-lowest: #0d0e13;
  --surface-low: #1a1b21;
  --surface: #1e1f25;
  --surface-high: #292a2f;

  --coral: #ff525e;
  --coral-dark: #d8323e;
  --coral-light: #ffb3b2;
  --teal: #00dfc1;
  --lavender: #ddb7ff;

  --on-surface: #e3e1e9;
  --muted: rgba(255, 255, 255, 0.58);
  --faint: rgba(255, 255, 255, 0.38);

  --glass-fill: rgba(255, 255, 255, 0.05);
  --glass-fill-strong: rgba(255, 255, 255, 0.08);
  --glass-stroke: rgba(255, 255, 255, 0.12);
  --glass-stroke-soft: rgba(255, 255, 255, 0.07);

  --radius-lg: 28px;
  --radius-md: 20px;
  --radius-sm: 14px;

  --shell: 1120px;
  --ease: cubic-bezier(0.2, 0.8, 0.2, 1);
}

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

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

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--on-surface);
  font-family: "Plus Jakarta Sans", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto,
    sans-serif;
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* ---------------------------------------------------------------- aurora -- */

/*
 * Three slow radial blobs behind everything, exactly like the app's ambient screensaver.
 * Radial gradients rather than blurred shapes: the softness comes free from the painter, so
 * this animates without a per-frame filter pass on a phone.
 */
.aurora {
  position: fixed;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  pointer-events: none;
}

.aurora::after {
  /* Vignette, so the edges of the page fall away into the dark. */
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(
    ellipse at 50% 40%,
    transparent 40%,
    rgba(0, 0, 0, 0.55) 100%
  );
}

.blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.55;
  will-change: transform;
}

.blob-coral {
  width: 68vmax;
  height: 68vmax;
  left: 8%;
  top: -22vmax;
  background: radial-gradient(circle, rgba(255, 82, 94, 0.62), rgba(255, 82, 94, 0) 68%);
  animation: drift-a 120s linear infinite;
}

.blob-lavender {
  width: 54vmax;
  height: 54vmax;
  right: -6%;
  top: 22vmax;
  background: radial-gradient(circle, rgba(221, 183, 255, 0.4), rgba(221, 183, 255, 0) 68%);
  animation: drift-b 97s linear infinite;
}

.blob-teal {
  width: 46vmax;
  height: 46vmax;
  left: -8%;
  top: 68vmax;
  background: radial-gradient(circle, rgba(0, 223, 193, 0.28), rgba(0, 223, 193, 0) 68%);
  animation: drift-c 61s linear infinite;
}

@keyframes drift-a {
  0% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(7vmax, 5vmax) scale(1.08); }
  66% { transform: translate(-5vmax, 8vmax) scale(0.95); }
  100% { transform: translate(0, 0) scale(1); }
}

@keyframes drift-b {
  0% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(-8vmax, 6vmax) scale(1.12); }
  100% { transform: translate(0, 0) scale(1); }
}

@keyframes drift-c {
  0% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(6vmax, -7vmax) scale(0.9); }
  100% { transform: translate(0, 0) scale(1); }
}

/* --------------------------------------------------------------- layout -- */

.shell {
  width: min(100% - 40px, var(--shell));
  margin-inline: auto;
}

section {
  padding-block: clamp(56px, 9vw, 104px);
}

.eyebrow {
  margin: 0 0 12px;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--faint);
}

h2 {
  margin: 0 0 14px;
  font-size: clamp(1.7rem, 3.6vw, 2.4rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.section-lede {
  margin: 0 0 40px;
  max-width: 58ch;
  color: var(--muted);
}

/* ------------------------------------------------------------------ nav -- */

.nav {
  position: sticky;
  top: 0;
  z-index: 10;
  padding-block: 16px;
  background: rgba(18, 19, 24, 0.7);
  backdrop-filter: blur(18px) saturate(140%);
  -webkit-backdrop-filter: blur(18px) saturate(140%);
  border-bottom: 1px solid var(--glass-stroke-soft);
}

.nav .shell {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--on-surface);
  text-decoration: none;
}

.brand img {
  width: 34px;
  height: 34px;
  border-radius: 10px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-link {
  padding: 8px 14px;
  border-radius: 999px;
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 600;
  text-decoration: none;
  transition: color 0.2s var(--ease), background 0.2s var(--ease);
}

.nav-link:hover {
  color: var(--on-surface);
  background: var(--glass-fill);
}

/* The one nav item that asks for something, so it gets the coral rather than the muted grey. */
.nav-support {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  color: var(--coral-light);
  border: 1px solid rgba(255, 82, 94, 0.3);
  background: rgba(255, 82, 94, 0.09);
}

.nav-support svg {
  width: 15px;
  height: 15px;
  flex: none;
}

.nav-support:hover {
  color: #fff;
  background: rgba(255, 82, 94, 0.2);
}

@media (max-width: 620px) {
  .nav-link.is-optional {
    display: none;
  }

  /* Keep the label on phones too, just tighter — the cup icon alone isn't obvious. */
  .nav-support {
    padding: 8px 12px;
    font-size: 13px;
  }

  .nav-support svg {
    width: 17px;
    height: 17px;
  }
}

/* ----------------------------------------------------------------- hero -- */

.hero {
  padding-top: clamp(48px, 8vw, 88px);
}

.hero .shell {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: clamp(32px, 6vw, 72px);
  align-items: center;
}

@media (max-width: 880px) {
  .hero .shell {
    grid-template-columns: 1fr;
    text-align: center;
    justify-items: center;
  }
}

.pill {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 7px 16px 7px 10px;
  border-radius: 999px;
  border: 1px solid var(--glass-stroke);
  background: var(--glass-fill);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--muted);
}

.pill .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--teal);
  box-shadow: 0 0 12px var(--teal);
}

h1 {
  margin: 22px 0 0;
  font-size: clamp(2.8rem, 8vw, 4.6rem);
  font-weight: 800;
  line-height: 1.02;
  letter-spacing: -0.035em;
}

h1 .accent {
  background: linear-gradient(120deg, var(--coral) 0%, var(--coral-light) 55%, var(--lavender) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.tagline {
  margin: 18px 0 0;
  max-width: 46ch;
  font-size: clamp(1.02rem, 2vw, 1.2rem);
  color: var(--muted);
}

@media (max-width: 880px) {
  .tagline {
    margin-inline: auto;
  }
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
  margin-top: 34px;
}

@media (max-width: 880px) {
  .cta-row {
    justify-content: center;
  }
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 16px 28px;
  border-radius: 999px;
  border: 1px solid transparent;
  font: inherit;
  font-weight: 700;
  font-size: 1rem;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.2s var(--ease), box-shadow 0.2s var(--ease),
    background 0.2s var(--ease);
}

.btn:active {
  transform: translateY(1px);
}

.btn-primary {
  color: #fff;
  background: linear-gradient(135deg, var(--coral) 0%, var(--coral-dark) 100%);
  box-shadow: 0 10px 34px rgba(255, 82, 94, 0.36);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 16px 44px rgba(255, 82, 94, 0.46);
}

.btn-primary.is-muted {
  opacity: 0.7;
  box-shadow: none;
  background: linear-gradient(135deg, #7a3a40 0%, #5d2a31 100%);
}

.btn-ghost {
  color: var(--on-surface);
  border-color: var(--glass-stroke);
  background: var(--glass-fill);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

.btn-ghost:hover {
  background: var(--glass-fill-strong);
}

.btn svg {
  width: 20px;
  height: 20px;
  flex: none;
}

.cta-meta {
  margin: 16px 0 0;
  font-size: 0.85rem;
  color: var(--faint);
}

.alt-builds {
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

@media (max-width: 880px) {
  .alt-builds {
    justify-content: center;
  }
}

.alt-builds a {
  display: inline-block;
  padding: 7px 14px;
  border-radius: 999px;
  border: 1px solid var(--glass-stroke-soft);
  background: var(--glass-fill);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--muted);
  text-decoration: none;
}

.alt-builds a:hover {
  color: var(--on-surface);
  border-color: var(--glass-stroke);
}

/* MusicSM Desktop's and the Wear OS app's buttons: quieter rows under the Android download. */
.desktop-cta .cta-row,
.wear-cta .cta-row {
  margin-top: 24px;
}

.btn-ghost.is-muted {
  opacity: 0.6;
}

/* The Mac one-line install: a pill like the UPI id's, with the command and a Copy button. */
.install-cmd {
  margin-top: 20px;
}

.install-cmd-label {
  margin: 0;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--muted);
}

.install-cmd-row {
  display: inline-flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 10px;
  padding: 8px 8px 8px 18px;
  border-radius: 999px;
  border: 1px solid var(--glass-stroke);
  background: var(--glass-fill-strong);
  max-width: 100%;
}

.install-cmd-row code {
  font-family: ui-monospace, "SFMono-Regular", "Cascadia Mono", Menlo, monospace;
  font-size: 0.85rem;
  color: var(--on-surface);
  overflow-wrap: anywhere;
}

.install-cmd-hint {
  margin: 10px 0 0;
  font-size: 0.8rem;
  color: var(--faint);
}

.install-cmd-hint a {
  color: var(--muted);
}

@media (max-width: 880px) {
  .install-cmd-row {
    justify-content: center;
    border-radius: var(--radius-sm);
  }
}

/* ---------------------------------------------------------- hero visual -- */

.hero-art {
  position: relative;
  display: grid;
  place-items: center;
  width: min(100%, 460px);
  /*
   * Reserved height for the meter. The tile is square and fills the full width, so without this
   * the meter would have nowhere to sit but on top of the artwork.
   */
  padding-bottom: 76px;
}

/* The sleeve bloom from ambient mode: a glow in the artwork's own colour, never a black shadow. */
.hero-art::before {
  content: "";
  position: absolute;
  /*
   * Anchored to the square tile rather than stretched over the whole box, which now includes the
   * reserved strip beneath it. `breathe` animates transform here, so this cannot use a translate.
   */
  inset: -14% -14% auto -14%;
  aspect-ratio: 1;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 82, 94, 0.45), rgba(255, 82, 94, 0) 66%);
  filter: blur(26px);
  animation: breathe 11s ease-in-out infinite;
}

.hero-art img {
  position: relative;
  display: block;
  width: 100%;
  /*
   * The width/height attributes on the <img> are presentational hints that map to CSS. Setting
   * only `width` here would leave the height hint in force and stretch the square icon, so the
   * height has to be explicitly handed back to the intrinsic aspect ratio.
   */
  height: auto;
  border-radius: 13%;
  border: 1px solid var(--glass-stroke);
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.55);
  animation: breathe 11s ease-in-out infinite;
}

@keyframes breathe {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.035); }
}

/* Decorative level meter — it is an ornament, not a readout of anything. */
.meter {
  position: absolute;
  bottom: 0;
  display: flex;
  align-items: flex-end;
  gap: 5px;
  height: 34px;
  padding: 12px 18px;
  border-radius: 999px;
  border: 1px solid var(--glass-stroke);
  background: rgba(255, 255, 255, 0.06);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-sizing: content-box;
}

.meter i {
  display: block;
  width: 4px;
  border-radius: 2px;
  background: linear-gradient(to top, var(--coral), var(--coral-light));
  animation: bounce 1.15s ease-in-out infinite;
}

.meter i:nth-child(1) { height: 40%; animation-delay: -0.9s; }
.meter i:nth-child(2) { height: 75%; animation-delay: -0.4s; }
.meter i:nth-child(3) { height: 100%; animation-delay: -0.75s; }
.meter i:nth-child(4) { height: 60%; animation-delay: -0.15s; }
.meter i:nth-child(5) { height: 85%; animation-delay: -0.6s; }

@keyframes bounce {
  0%, 100% { transform: scaleY(0.35); }
  50% { transform: scaleY(1); }
}

/* ---------------------------------------------------------------- stats -- */

.stats {
  padding-block: 0;
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 16px;
}

.card {
  padding: 26px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--glass-stroke);
  background: var(--glass-fill);
  backdrop-filter: blur(24px) saturate(140%);
  -webkit-backdrop-filter: blur(24px) saturate(140%);
}

.stat .value {
  display: block;
  font-size: clamp(2rem, 5vw, 2.7rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
}

.stat .label {
  display: block;
  margin-top: 6px;
  font-size: 0.84rem;
  font-weight: 600;
  color: var(--muted);
}

.stat .note {
  display: block;
  margin-top: 4px;
  font-size: 0.75rem;
  color: var(--faint);
}

.stat-coral .value { color: var(--coral); }
.stat-teal .value { color: var(--teal); }
.stat-lavender .value { color: var(--lavender); }

/* ------------------------------------------------------------- features -- */

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(258px, 1fr));
  gap: 16px;
}

.feature {
  transition: transform 0.25s var(--ease), border-color 0.25s var(--ease);
}

.feature:hover {
  transform: translateY(-4px);
  border-color: rgba(255, 255, 255, 0.22);
}

.feature .icon {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  margin-bottom: 16px;
  border-radius: var(--radius-sm);
  background: rgba(255, 82, 94, 0.14);
  color: var(--coral);
}

.feature .icon svg {
  width: 22px;
  height: 22px;
}

.feature h3 {
  margin: 0 0 8px;
  font-size: 1.04rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.feature p {
  margin: 0;
  font-size: 0.92rem;
  color: var(--muted);
}

/* -------------------------------------------------------------- install -- */

.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(258px, 1fr));
  gap: 16px;
  counter-reset: step;
}

.step {
  position: relative;
  padding-top: 30px;
}

.step::before {
  counter-increment: step;
  content: counter(step);
  position: absolute;
  top: 26px;
  left: 26px;
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: rgba(255, 82, 94, 0.16);
  color: var(--coral);
  font-size: 0.85rem;
  font-weight: 800;
}

.step h3 {
  margin: 44px 0 8px;
  font-size: 1rem;
  font-weight: 700;
}

.step p {
  margin: 0;
  font-size: 0.92rem;
  color: var(--muted);
}

.notice {
  margin-top: 20px;
  padding: 18px 22px;
  border-radius: var(--radius-md);
  border: 1px solid rgba(255, 82, 94, 0.28);
  background: rgba(255, 82, 94, 0.07);
  font-size: 0.88rem;
  color: var(--muted);
}

/* -------------------------------------------------------------- support -- */

.support {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: clamp(28px, 5vw, 60px);
  align-items: center;
  padding: clamp(26px, 4vw, 44px);
  border-radius: var(--radius-lg);
  border: 1px solid var(--glass-stroke);
  background: var(--glass-fill);
  backdrop-filter: blur(24px) saturate(140%);
  -webkit-backdrop-filter: blur(24px) saturate(140%);
}

.support h2,
.support .section-lede {
  margin-left: 0;
  margin-right: 0;
  text-align: left;
  max-width: 52ch;
}

.support-btn {
  margin-top: 26px;
}

/*
 * The QR is the only part of this page that must stay legible as an image rather than as styling,
 * so it keeps a white quiet zone instead of inheriting the glass treatment. Scanners need the
 * contrast and the margin.
 */
.support-qr {
  margin: 0;
  display: grid;
  justify-items: center;
  gap: 12px;
}

.support-qr img {
  display: block;
  width: clamp(168px, 22vw, 220px);
  height: auto;
  padding: 14px;
  border-radius: var(--radius-md);
  background: #fff;
  box-shadow: 0 18px 50px rgba(0, 0, 0, 0.45);
}

.support-qr figcaption {
  font-size: 0.8rem;
  color: var(--faint);
}

.upi-id {
  display: inline-flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
  padding: 10px 10px 10px 16px;
  border-radius: 999px;
  border: 1px solid var(--glass-stroke);
  background: var(--glass-fill-strong);
}

.upi-id-label {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--faint);
}

.upi-id code {
  font-family: ui-monospace, "SFMono-Regular", "Cascadia Mono", Menlo, monospace;
  font-size: 0.95rem;
  color: var(--on-surface);
  overflow-wrap: anywhere;
}

.copy-btn {
  padding: 8px 18px;
  border-radius: 999px;
  border: 1px solid var(--glass-stroke);
  background: rgba(255, 255, 255, 0.07);
  color: var(--on-surface);
  font: inherit;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s var(--ease), color 0.2s var(--ease);
}

.copy-btn:hover {
  background: rgba(255, 255, 255, 0.14);
}

.copy-btn.is-done {
  background: var(--teal);
  border-color: transparent;
  color: #08131a;
}

@media (max-width: 820px) {
  .support {
    grid-template-columns: 1fr;
    justify-items: center;
    text-align: center;
  }

  .support h2,
  .support .section-lede {
    text-align: center;
  }

  /* The QR reads as the fallback on desktop, so on a phone it belongs after the button. */
  .support-qr {
    order: 2;
  }
}

/* --------------------------------------------------------------- footer -- */

footer {
  padding-block: 40px 56px;
  border-top: 1px solid var(--glass-stroke-soft);
  font-size: 0.85rem;
  color: var(--faint);
}

footer .shell {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
}

footer a {
  color: var(--muted);
  text-decoration: none;
}

footer a:hover {
  color: var(--on-surface);
}

/* ------------------------------------------------------------ a11y bits -- */

:focus-visible {
  outline: 2px solid var(--coral-light);
  outline-offset: 3px;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/*
 * Respect the system setting. Everything animated here is decoration, so it can all simply
 * stop — nothing is load-bearing.
 */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}

/* ---- Support chooser dialog ---- */
.support-dialog {
  border: none;
  padding: 0;
  border-radius: 22px;
  background: transparent;
  color: var(--text, #e3e1e9);
  max-width: 420px;
  width: calc(100% - 32px);
}
.support-dialog::backdrop {
  background: rgba(6, 6, 10, 0.6);
  backdrop-filter: blur(6px);
}
.support-dialog-inner {
  position: relative;
  background: var(--surface, #1e1f25);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 22px;
  padding: 28px 26px 22px;
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.55);
}
.support-dialog-x {
  position: absolute;
  top: 12px;
  right: 14px;
  border: none;
  background: transparent;
  color: rgba(255, 255, 255, 0.6);
  font-size: 26px;
  line-height: 1;
  cursor: pointer;
}
.support-dialog-x:hover { color: #fff; }
.support-dialog h2 { margin: 0 0 6px; font-size: 24px; }
.support-dialog-lede {
  margin: 0 0 18px;
  color: rgba(255, 255, 255, 0.65);
  font-size: 15px;
}
.support-apps {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 18px;
}
.app-btn {
  padding: 16px 14px;
  border-radius: 14px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  background: rgba(255, 255, 255, 0.06);
  color: var(--text, #e3e1e9);
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.12s ease, background 0.12s ease, border-color 0.12s ease;
}
.app-btn:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.24);
  transform: translateY(-1px);
}
.app-btn-any {
  grid-column: 1 / -1;
  background: linear-gradient(135deg, var(--coral) 0%, var(--coral-dark) 100%);
  border-color: transparent;
  color: #fff;
}