:root {
  --bg: #07070b;
  --panel: rgba(255, 255, 255, 0.045);
  --line: rgba(255, 255, 255, 0.1);
  --text: #f4f4f7;
  --muted: rgba(235, 235, 245, 0.62);
  --faint: rgba(235, 235, 245, 0.34);
  --music: #ff5a78;
  --focus: #94faab;
  --sky: #6bc7fa;
  --amber: #ffcf6b;
  --radius: 20px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: Inter, -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei UI", sans-serif;
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a {
  color: inherit;
}

h1,
h2,
h3 {
  line-height: 1.2;
  margin: 0;
}

/* ---------- Background ---------- */

.aurora {
  position: fixed;
  inset: 0;
  z-index: -1;
  overflow: hidden;
}

.aurora__blob {
  position: absolute;
  width: 46vw;
  height: 46vw;
  min-width: 420px;
  min-height: 420px;
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.5;
  animation: drift 22s ease-in-out infinite alternate;
}

.aurora__blob--a {
  top: -14vw;
  left: -8vw;
  background: radial-gradient(circle, rgba(255, 90, 120, 0.55), transparent 68%);
}

.aurora__blob--b {
  top: -6vw;
  right: -10vw;
  background: radial-gradient(circle, rgba(107, 199, 250, 0.5), transparent 68%);
  animation-delay: -7s;
}

.aurora__blob--c {
  top: 52vh;
  left: 34vw;
  background: radial-gradient(circle, rgba(148, 250, 171, 0.34), transparent 68%);
  animation-delay: -13s;
}

.aurora__grid {
  position: absolute;
  inset: 0;
  background-image: linear-gradient(rgba(255, 255, 255, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.045) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, #000 30%, transparent 75%);
}

@keyframes drift {
  from {
    transform: translate3d(0, 0, 0) scale(1);
  }
  to {
    transform: translate3d(4vw, 6vh, 0) scale(1.15);
  }
}

/* ---------- Nav ---------- */

.nav {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px max(24px, 6vw);
  backdrop-filter: blur(14px);
  background: linear-gradient(180deg, rgba(7, 7, 11, 0.86), rgba(7, 7, 11, 0));
}

.nav__brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 18px;
  letter-spacing: 0.02em;
  text-decoration: none;
}

.nav__mark {
  width: 34px;
  height: 14px;
  border-radius: 0 0 8px 8px;
  background: #fff;
  box-shadow: 0 0 22px rgba(255, 255, 255, 0.45);
}

.nav__links {
  display: flex;
  align-items: center;
  gap: 22px;
  font-size: 14.5px;
  color: var(--muted);
}

.nav__links a {
  text-decoration: none;
  transition: color 0.2s var(--ease);
}

.nav__links a:hover {
  color: var(--text);
}

.nav__lang {
  padding: 6px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: none;
  color: var(--muted);
  font: inherit;
  font-size: 13px;
  cursor: pointer;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.nav__lang:hover {
  color: var(--text);
  border-color: rgba(255, 255, 255, 0.26);
}

.nav__repo {
  padding: 6px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--text);
}

/* ---------- Hero ---------- */

main {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 max(20px, 5vw) 80px;
}

.hero {
  padding: 60px 0 40px;
  text-align: center;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin: 0 0 26px;
  padding: 6px 15px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--panel);
  color: var(--muted);
  font-size: 13.5px;
  text-decoration: none;
}

.hero__badge .dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--focus);
  box-shadow: 0 0 10px var(--focus);
  animation: pulse 2.4s ease-in-out infinite;
}

@keyframes pulse {
  50% {
    opacity: 0.35;
  }
}

.hero__title {
  font-size: clamp(34px, 6.4vw, 66px);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.hero__gradient {
  background: linear-gradient(100deg, #ff5a78, #ffcf6b 38%, #94faab 66%, #6bc7fa);
  background-size: 220% 100%;
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  animation: sweep 9s linear infinite;
}

@keyframes sweep {
  to {
    background-position: 220% 0;
  }
}

.hero__lead {
  max-width: 620px;
  margin: 22px auto 0;
  color: var(--muted);
  font-size: 17px;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin-top: 30px;
}

.button {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 12px 22px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--panel);
  color: var(--text);
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  transition: transform 0.2s var(--ease), background 0.2s var(--ease), border-color 0.2s var(--ease);
}

.button svg {
  width: 17px;
  height: 17px;
  fill: currentColor;
}

.button:hover {
  transform: translateY(-2px);
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.24);
}

.button--primary {
  background: #fff;
  border-color: #fff;
  color: #0a0a0f;
  box-shadow: 0 12px 34px rgba(255, 255, 255, 0.16);
}

.button--primary:hover {
  background: #fff;
  color: #0a0a0f;
}

.hero__note {
  margin-top: 14px;
  color: var(--faint);
  font-size: 13.5px;
}

/* ---------- Notch demo ---------- */

.stage {
  margin-top: 54px;
  perspective: 1400px;
}

.screen {
  max-width: 880px;
  margin: 0 auto;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: linear-gradient(180deg, rgba(20, 20, 28, 0.92), rgba(10, 10, 16, 0.92));
  box-shadow: 0 40px 90px rgba(0, 0, 0, 0.6);
  overflow: hidden;
  transform: rotateX(7deg);
  transform-origin: top center;
}

.screen__bar {
  display: flex;
  gap: 7px;
  padding: 11px 14px;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.03);
}

.screen__dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.16);
}

.screen__body {
  position: relative;
  height: 330px;
  background: radial-gradient(ellipse at 50% -10%, rgba(107, 199, 250, 0.16), transparent 60%),
    repeating-linear-gradient(115deg, rgba(255, 255, 255, 0.02) 0 22px, transparent 22px 44px);
}

.notch {
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  border-radius: 0 0 14px 14px;
  background: #000;
  overflow: hidden;
  width: 390px;
  height: 34px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.55);
  transition: width 0.55s var(--ease), height 0.55s var(--ease), border-radius 0.55s var(--ease);
}

.notch.is-open {
  width: 560px;
  height: 232px;
  border-radius: 0 0 26px 26px;
}

.notch__inner {
  position: relative;
  width: 100%;
  height: 100%;
}

.notch__compact {
  display: flex;
  align-items: center;
  gap: 12px;
  height: 34px;
  padding: 0 14px;
  opacity: 1;
  transition: opacity 0.3s var(--ease);
}

.notch.is-open .notch__compact {
  opacity: 0;
}

.notch__art {
  width: 20px;
  height: 20px;
  flex: none;
  border-radius: 5px;
  background: linear-gradient(135deg, #ff5a78, #ffcf6b);
}

.notch__lyric {
  flex: 1;
  overflow: hidden;
  white-space: nowrap;
  font-size: 12.5px;
}

.notch__lyric b {
  font-weight: 500;
  color: #fff;
}

.notch__lyric span {
  color: rgba(255, 255, 255, 0.42);
}

.notch__eq {
  display: flex;
  align-items: flex-end;
  gap: 2px;
  height: 13px;
}

.notch__eq i {
  width: 3px;
  height: 100%;
  border-radius: 2px;
  background: var(--music);
  animation: equalize 0.9s ease-in-out infinite alternate;
}

.notch__eq i:nth-child(2) {
  animation-delay: -0.45s;
}
.notch__eq i:nth-child(3) {
  animation-delay: -0.2s;
}
.notch__eq i:nth-child(4) {
  animation-delay: -0.65s;
}

@keyframes equalize {
  from {
    transform: scaleY(0.3);
  }
}

.notch__panel {
  position: absolute;
  inset: 0;
  padding: 10px 16px 16px;
  opacity: 0;
  transform: translateY(-6px);
  transition: opacity 0.35s var(--ease) 0.1s, transform 0.35s var(--ease) 0.1s;
  pointer-events: none;
}

.notch.is-open .notch__panel {
  opacity: 1;
  transform: none;
}

.notch__tabs {
  display: flex;
  gap: 6px;
  font-size: 11.5px;
  color: var(--faint);
}

.tab {
  padding: 4px 10px;
  border-radius: 999px;
}

.tab.is-active {
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
}

.notch__content {
  display: flex;
  gap: 16px;
  margin-top: 14px;
}

.cover {
  width: 96px;
  height: 96px;
  flex: none;
  border-radius: 12px;
  background: linear-gradient(140deg, #ff5a78, #ffcf6b 45%, #6bc7fa);
  box-shadow: 0 10px 24px rgba(255, 90, 120, 0.25);
}

.track {
  min-width: 0;
  flex: 1;
}

.track__title {
  font-size: 15px;
  font-weight: 600;
}

.track__line {
  margin-top: 5px;
  font-size: 12.5px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.track__line--dim {
  color: var(--faint);
}

.track__line--now {
  font-weight: 600;
}

.track__line--now b {
  color: #fff;
}

.track__line--now span {
  color: rgba(255, 255, 255, 0.4);
}

.track__bar {
  margin-top: 12px;
  height: 3px;
  border-radius: 2px;
  background: rgba(255, 255, 255, 0.16);
  overflow: hidden;
}

.track__bar i {
  display: block;
  height: 100%;
  width: 34%;
  border-radius: 2px;
  background: #fff;
}

.screen__hint {
  position: absolute;
  bottom: 16px;
  left: 0;
  right: 0;
  text-align: center;
  color: var(--faint);
  font-size: 13px;
}

/* ---------- Sections ---------- */

.section__title {
  margin: 0 0 28px;
  font-size: clamp(24px, 3.4vw, 34px);
  font-weight: 700;
  letter-spacing: -0.01em;
}

.features,
.download,
.build {
  padding-top: 84px;
  scroll-margin-top: 80px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(270px, 1fr));
  gap: 18px;
}

.card {
  display: flex;
  flex-direction: column;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  backdrop-filter: blur(10px);
  transition: transform 0.3s var(--ease), border-color 0.3s var(--ease);
}

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

.card--wide {
  grid-column: span 2;
}

.card h3 {
  font-size: 19px;
  margin-bottom: 8px;
}

.card p {
  margin: 0;
  color: var(--muted);
  font-size: 14.5px;
}

.card__demo {
  /* Pinned to the bottom so a wide card is not mostly empty. */
  margin-top: auto;
  padding-top: 16px;
  padding: 14px 16px;
  border-radius: 12px;
  background: #000;
  font-size: 15px;
}

.karaoke b {
  color: #fff;
}

.karaoke span {
  color: rgba(255, 255, 255, 0.38);
}

.rows {
  /* Same reason as .card__demo: the list sits at the foot of the card. */
  margin: auto 0 0;
  padding: 0;
  list-style: none;
  border-radius: 12px;
  background: #000;
  overflow: hidden;
}

.rows li {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 9px 13px;
  font-size: 13.5px;
}

.rows li + li {
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}

.rows em {
  margin-left: auto;
  color: var(--faint);
  font-style: normal;
  font-size: 12.5px;
}

.pill {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.24);
}

.pill--live {
  background: var(--focus);
  box-shadow: 0 0 9px var(--focus);
}

.pill--wait {
  background: var(--amber);
  box-shadow: 0 0 9px var(--amber);
}

.pill--code {
  background: var(--sky);
}

/* ---------- Download ---------- */

.download__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 18px;
}

.release {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 14px;
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
}

.release header {
  display: flex;
  align-items: baseline;
  gap: 12px;
  flex-wrap: wrap;
}

.release h3 {
  font-size: 21px;
}

.release__meta {
  color: var(--faint);
  font-size: 13px;
}

.release__hint {
  margin: 0;
  color: var(--muted);
  font-size: 13.5px;
}

.release__hint code,
.code {
  font-family: "SF Mono", ui-monospace, "Cascadia Mono", Consolas, monospace;
}

.release__hint code {
  padding: 2px 6px;
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.08);
  font-size: 12.5px;
}

.download__all {
  margin-top: 20px;
  color: var(--muted);
  font-size: 14.5px;
}

/* ---------- Build ---------- */

.code {
  margin: 0;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(0, 0, 0, 0.45);
  color: #e8e8ef;
  font-size: 13.5px;
  line-height: 1.9;
  overflow-x: auto;
}

.code .c {
  color: var(--faint);
}

.build__note {
  margin-top: 18px;
  color: var(--muted);
  font-size: 14.5px;
}

/* ---------- Footer ---------- */

.footer {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  flex-wrap: wrap;
  max-width: 1120px;
  margin: 0 auto;
  padding: 26px max(20px, 5vw) 44px;
  border-top: 1px solid var(--line);
  color: var(--faint);
  font-size: 13.5px;
}

.footer a {
  text-decoration: none;
}

.footer a:hover {
  color: var(--text);
}

/* ---------- Reveal ---------- */

.card,
.release,
.code,
.section__title {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
}

.is-visible {
  opacity: 1 !important;
  transform: none !important;
}

@media (max-width: 720px) {
  .nav__links a:not(.nav__repo) {
    display: none;
  }

  .nav__links {
    gap: 12px;
  }

  .card--wide {
    grid-column: span 1;
  }

  .screen {
    transform: none;
  }

  .screen__body {
    height: 270px;
  }

  .notch,
  .notch.is-open {
    width: min(92%, 420px);
  }

  .notch.is-open {
    height: 250px;
  }

  .notch__content {
    gap: 12px;
  }

  .cover {
    width: 72px;
    height: 72px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}