:root {
  color-scheme: dark;
  --bg: #050711;
  --bg-deep: #02040a;
  --surface: rgba(15, 20, 34, 0.76);
  --surface-strong: #101525;
  --line: rgba(163, 182, 220, 0.14);
  --line-strong: rgba(163, 182, 220, 0.24);
  --text: #f7f8fb;
  --muted: #a5adc0;
  --muted-soft: #788198;
  --cyan: #20b8ff;
  --blue: #4e6fff;
  --violet: #ba42f2;
  --warm-current: #f4e8d4;
  --warm-secondary: #d5cec3;
  --content: 1200px;
  --gutter: clamp(22px, 5vw, 72px);
  --radius: 24px;
  --shadow: 0 30px 90px rgba(0, 0, 0, 0.42);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-width: 320px;
  background:
    radial-gradient(900px 500px at 78% 10%, rgba(38, 85, 184, 0.14), transparent 70%),
    var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "PingFang SC", "Helvetica Neue", sans-serif;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
button, a { -webkit-tap-highlight-color: transparent; }
img { display: block; max-width: 100%; }

.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 100;
  transform: translateY(-150%);
  padding: 10px 14px;
  border-radius: 8px;
  background: white;
  color: black;
}
.skip-link:focus { transform: none; }

.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 50;
  border-bottom: 1px solid transparent;
  transition: background .25s ease, border-color .25s ease, backdrop-filter .25s ease;
}
.site-header.scrolled {
  background: rgba(5, 7, 17, .76);
  border-color: var(--line);
  backdrop-filter: blur(22px) saturate(140%);
}
.header-inner {
  width: min(calc(100% - 2 * var(--gutter)), var(--content));
  height: 80px;
  margin: 0 auto;
  display: flex;
  align-items: center;
}
.brand { display: inline-flex; align-items: center; gap: 11px; font-size: 18px; font-weight: 650; letter-spacing: -.02em; }
.brand img { border-radius: 9px; box-shadow: 0 6px 22px rgba(44, 103, 255, .24); }
.main-nav { display: flex; align-items: center; gap: 34px; margin-left: auto; margin-right: 34px; }
.main-nav a, .site-footer nav a { color: var(--muted); font-size: 14px; transition: color .2s ease; }
.main-nav a:hover, .site-footer nav a:hover { color: var(--text); }

.button {
  min-height: 54px;
  padding: 0 25px;
  border: 0;
  border-radius: 16px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  font-size: 16px;
  font-weight: 650;
  box-shadow: 0 15px 40px rgba(61, 91, 255, .22);
  transition: transform .2s ease, box-shadow .2s ease, filter .2s ease;
}
.button:hover { transform: translateY(-2px); box-shadow: 0 20px 50px rgba(61, 91, 255, .32); filter: brightness(1.07); }
.button:focus-visible, .text-link:focus-visible, .main-nav a:focus-visible, .site-footer a:focus-visible { outline: 2px solid var(--cyan); outline-offset: 4px; }
.button svg { width: 20px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.button-primary { color: white; background: linear-gradient(115deg, #11bdf5, #5266ff 52%, #b93dea); }
.button-small { min-height: 42px; padding: 0 19px; border-radius: 13px; font-size: 14px; }
.button-large { min-width: 238px; min-height: 60px; font-size: 17px; border-radius: 18px; }
.menu-button, .mobile-nav { display: none; }

.section {
  width: min(calc(100% - 2 * var(--gutter)), var(--content));
  margin: 0 auto;
}

.hero {
  min-height: 850px;
  padding-top: 156px;
  padding-bottom: 100px;
  display: grid;
  grid-template-columns: .82fr 1.18fr;
  gap: clamp(40px, 6vw, 90px);
  align-items: center;
}
.hero-copy { position: relative; z-index: 2; }
.hero h1 {
  margin: 0;
  font-size: clamp(66px, 6.6vw, 100px);
  line-height: .99;
  letter-spacing: -.065em;
  font-weight: 720;
}
.hero-copy > p:not(.release-meta) {
  max-width: 500px;
  margin: 30px 0 0;
  color: #bcc3d2;
  font-size: clamp(18px, 1.7vw, 22px);
  line-height: 1.75;
  letter-spacing: -.015em;
}
.hero-actions { display: flex; align-items: center; gap: 27px; margin-top: 38px; }
.text-link { color: #b9c6e7; border-bottom: 1px solid rgba(80, 184, 255, .45); padding: 11px 0 8px; font-size: 15px; }
.text-link span { margin-left: 8px; color: var(--cyan); }
.release-meta { margin: 20px 0 0; color: var(--muted-soft); font-size: 13px; }

.desktop-stage { position: relative; min-width: 0; }
.desktop-screen {
  position: relative;
  aspect-ratio: 1.17 / 1;
  overflow: hidden;
  border: 1px solid rgba(184, 202, 234, .22);
  border-radius: 30px;
  background:
    radial-gradient(90% 70% at 90% 25%, rgba(48, 78, 145, .28), transparent 66%),
    linear-gradient(150deg, #15223a 0%, #09111f 58%, #02050c 100%);
  box-shadow: var(--shadow), inset 0 1px 0 rgba(255, 255, 255, .08);
}
.mac-menu-bar {
  height: 36px;
  padding: 0 15px;
  display: flex;
  align-items: center;
  gap: 15px;
  background: rgba(2, 5, 12, .58);
  backdrop-filter: blur(12px);
  font-size: 11px;
  color: rgba(255,255,255,.8);
}
.mac-menu-bar strong { font-weight: 650; }
.apple-mark { font-size: 9px; }
.menu-spacer { flex: 1; }
.wallpaper-shape { position: absolute; border-radius: 50%; filter: blur(.2px); }
.wallpaper-one { width: 90%; height: 62%; right: -20%; top: 21%; background: linear-gradient(125deg, rgba(31, 46, 84, .08), rgba(71, 93, 141, .35)); transform: rotate(-13deg); }
.wallpaper-two { width: 80%; height: 38%; left: -26%; bottom: 5%; background: linear-gradient(35deg, rgba(15, 21, 37, .1), rgba(37, 61, 105, .3)); transform: rotate(10deg); }
.lyric-panel {
  position: absolute;
  color: var(--warm-current);
  background: rgba(7, 9, 13, .72);
  border-radius: 22px;
  box-shadow: 0 18px 50px rgba(0,0,0,.42), inset 0 1px rgba(255,255,255,.04);
}
.lyric-panel-default { width: 76%; height: 42%; right: 4.4%; bottom: 13%; padding: 18px 24px; }
.track-line { color: #afa79c; font-size: 12px; font-weight: 500; }
.lyric-stack { height: calc(100% - 20px); display: flex; flex-direction: column; justify-content: center; gap: 12px; overflow: hidden; }
.lyric-stack p { margin: 0; font-size: clamp(12px, 1.45vw, 20px); font-weight: 540; transform-origin: left; }
.lyric-past, .lyric-next { color: var(--warm-secondary); }
.lyric-past-2 { opacity: .3; filter: blur(1px); transform: scale(.72); }
.lyric-past-1 { opacity: .66; filter: blur(.36px); transform: scale(.72); }
.lyric-current { text-shadow: 0 2px 5px rgba(0,0,0,.46); }
.lyric-next { opacity: .61; transform: scale(.72); }
.dock { position: absolute; left: 50%; bottom: 2.4%; transform: translateX(-50%); display: flex; align-items: center; gap: 6px; padding: 5px 8px; background: rgba(196, 207, 227, .11); border: 1px solid rgba(255,255,255,.1); backdrop-filter: blur(15px); border-radius: 10px; }
.dock i, .dock img { width: 22px; height: 22px; border-radius: 6px; }
.dock i:nth-child(1) { background: #6cbef8; } .dock i:nth-child(2) { background: #fff; } .dock i:nth-child(3) { background: #2fc06a; } .dock i:nth-child(4) { background: #f16c76; } .dock i:nth-child(5) { background: #7588ff; } .dock i:last-child { background: #7c8494; }
.figure-note { margin: 13px 0 0; text-align: right; color: var(--muted-soft); font-size: 12px; }

.trust-strip {
  width: min(calc(100% - 2 * var(--gutter)), var(--content));
  margin: 0 auto;
  padding: 34px 0;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.trust-strip div { display: flex; flex-direction: column; align-items: center; gap: 7px; border-right: 1px solid var(--line); }
.trust-strip div:last-child { border: 0; }
.trust-strip strong { font-size: 20px; letter-spacing: -.03em; }
.trust-strip span { color: var(--muted-soft); font-size: 12px; }

.story, .appearance, .control, .players, .details { padding-top: clamp(120px, 14vw, 210px); padding-bottom: clamp(70px, 9vw, 130px); }
.story, .appearance, .control { display: grid; grid-template-columns: .78fr 1.22fr; gap: clamp(55px, 9vw, 130px); align-items: center; }
.appearance { grid-template-columns: 1.2fr .8fr; }
.section-number { margin: 0 0 22px; color: #6e7890; font-size: 12px; letter-spacing: .12em; text-transform: uppercase; }
.section-copy h2, .players h2, .details h2, .download-section h2 { margin: 0; font-size: clamp(46px, 5vw, 72px); line-height: 1.08; letter-spacing: -.055em; }
.section-copy > p:not(.section-number), .players-heading > p:not(.section-number), .details-copy > p:not(.section-number) { margin: 25px 0 0; color: var(--muted); font-size: 17px; line-height: 1.85; }
.plain-list { list-style: none; padding: 0; margin: 30px 0 0; }
.plain-list li { position: relative; padding: 13px 0 13px 20px; border-top: 1px solid var(--line); color: #c7ccda; font-size: 14px; }
.plain-list li:last-child { border-bottom: 1px solid var(--line); }
.plain-list li::before { content: ''; position: absolute; left: 0; top: 20px; width: 5px; height: 5px; border-radius: 50%; background: var(--cyan); box-shadow: 0 0 12px var(--cyan); }

.sync-visual { min-width: 0; padding: 54px 0; }
.timing-readout { display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; gap: 30px; color: var(--muted-soft); font-size: 13px; }
.timing-readout span:last-child { text-align: right; }
.timing-readout strong { color: #dbe4f8; font-size: 18px; font-variant-numeric: tabular-nums; }
.timeline { height: 82px; display: flex; align-items: center; justify-content: space-between; position: relative; padding: 0 6px; }
.timeline::before { content: ''; position: absolute; left: 6px; right: 6px; height: 1px; background: var(--line-strong); }
.timeline i, .timeline b { position: relative; width: 8px; height: 8px; border-radius: 50%; background: #313a51; }
.timeline b { width: 18px; height: 18px; border: 4px solid #55aaff; background: #704df0; box-shadow: 0 0 28px rgba(52, 181, 255, .75); }
.large-lyrics { padding: 22px 0 8px; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.large-lyrics p { margin: 0; padding: 15px 0; font-size: clamp(24px, 3vw, 42px); font-weight: 560; letter-spacing: -.03em; }
.large-lyrics .blur-3 { color: #636b7d; opacity: .27; filter: blur(2.4px); transform: scale(.78); transform-origin: left; }
.large-lyrics .blur-2 { color: #7e8799; opacity: .5; filter: blur(.9px); transform: scale(.82); transform-origin: left; }
.large-lyrics .active { color: var(--warm-current); text-shadow: 0 0 26px rgba(244, 232, 212, .12); }
.large-lyrics .future { color: var(--warm-secondary); opacity: .56; transform: scale(.78); transform-origin: left; }

.appearance-demo { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; perspective: 900px; }
.preset { min-height: 150px; padding: 20px; border-radius: 18px; position: relative; overflow: hidden; display: flex; flex-direction: column; justify-content: center; box-shadow: 0 20px 50px rgba(0,0,0,.2); }
.preset > span { position: absolute; top: 14px; left: 16px; color: rgba(255,255,255,.55); font-size: 11px; }
.preset div { font-size: clamp(15px, 1.5vw, 21px); font-weight: 600; }
.preset p, .preset small { margin: 8px 0 0; color: #d8d0c4; opacity: .62; font-size: 11px; }
.preset-minimal { min-height: 92px; grid-column: 1 / -1; color: #00acfd; text-align: center; background: rgba(7,9,13,.79); border-radius: 8px; }
.preset-classic { color: #00acfd; text-align: center; background: rgba(7,9,13,.48); border-radius: 10px; }
.preset-transparent { color: #00acfd; align-items: flex-end; justify-content: center; background: linear-gradient(140deg, rgba(31,53,86,.4), rgba(8,12,22,.15)); border: 1px dashed rgba(109, 142, 199, .3); border-radius: 10px; }
.preset-glass { grid-column: 1 / -1; color: #95f16b; align-items: center; background: rgba(104, 118, 163, .24); backdrop-filter: blur(22px); border: 1px solid rgba(255,255,255,.18); border-radius: 26px; }
.subtle-note { padding-top: 22px; border-top: 1px solid var(--line); color: var(--muted-soft) !important; font-size: 14px !important; }

.control-visual { min-height: 390px; display: grid; align-content: center; }
.cursor-line { display: flex; align-items: center; gap: 10px; margin: 0 0 18px auto; color: var(--muted); font-size: 12px; }
.cursor { font-size: 28px; color: var(--cyan); transform: rotate(-12deg); }
.mini-panel { min-height: 210px; padding: 24px; border-radius: 22px; position: relative; display: flex; flex-direction: column; justify-content: center; background: rgba(7,9,13,.72); border: 1px solid var(--line); box-shadow: var(--shadow); }
.mini-track { position: absolute; top: 22px; left: 24px; color: #afa79c; font-size: 12px; }
.mini-panel > p { margin: 0; color: var(--warm-current); font-size: clamp(24px, 3vw, 38px); font-weight: 580; }
.lock-state { position: absolute; right: 18px; bottom: 16px; display: flex; align-items: center; gap: 7px; color: var(--muted-soft); font-size: 11px; }
.lock-state svg { width: 15px; fill: none; stroke: currentColor; stroke-width: 1.6; }
.position-guide { display: grid; grid-template-columns: repeat(3, 1fr); margin-top: 20px; padding: 14px 18px; border-top: 1px solid var(--line); color: var(--muted-soft); font-size: 12px; }
.position-guide span:nth-child(2) { text-align: center; }
.position-guide strong { color: var(--cyan); text-align: right; font-weight: 550; }
.shortcut-list { margin-top: 32px; }
.shortcut-list > div { display: flex; align-items: center; padding: 14px 0; border-top: 1px solid var(--line); }
.shortcut-list > div:last-child { border-bottom: 1px solid var(--line); }
.shortcut-list span { flex: 1; color: #cad0df; font-size: 13px; }
kbd { min-width: 28px; height: 28px; margin-left: 5px; display: inline-grid; place-items: center; border: 1px solid var(--line-strong); border-bottom-color: rgba(218,229,255,.34); border-radius: 7px; background: #111626; box-shadow: 0 2px 0 #02040a; color: #dce2ef; font-family: inherit; font-size: 12px; }

.players { display: grid; grid-template-columns: .83fr 1.17fr; gap: clamp(60px, 10vw, 150px); align-items: end; }
.player-list { border-top: 1px solid var(--line); }
.player-list > div { min-height: 90px; display: grid; grid-template-columns: 48px 1fr auto; align-items: center; gap: 18px; border-bottom: 1px solid var(--line); }
.player-list strong { font-size: 20px; font-weight: 560; letter-spacing: -.02em; }
.player-list em { color: var(--muted-soft); font-size: 12px; font-style: normal; }
.player-dot { width: 38px; height: 38px; display: grid; place-items: center; border-radius: 10px; color: white; font-size: 18px; font-weight: 700; box-shadow: inset 0 1px rgba(255,255,255,.18); }
.netease { background: #d9252c; } .qq { background: #19ae67; } .spotify { background: #1db954; color: #06160b; } .kugou { background: #2686ef; }

.details { display: grid; grid-template-columns: .8fr 1.2fr; gap: clamp(60px, 10vw, 150px); }
.fact-list { border-top: 1px solid var(--line); }
.fact-list article { display: grid; grid-template-columns: 80px 1fr; column-gap: 25px; padding: 29px 0; border-bottom: 1px solid var(--line); }
.fact-list span { grid-row: 1 / 3; color: #66718b; font-size: 12px; letter-spacing: .06em; }
.fact-list h3 { margin: 0; font-size: 19px; font-weight: 580; }
.fact-list p { margin: 9px 0 0; color: var(--muted); font-size: 13px; line-height: 1.75; }

.download-section {
  position: relative;
  overflow: hidden;
  margin-top: 100px;
  padding-top: 100px;
  padding-bottom: 100px;
  border: 1px solid rgba(74, 137, 255, .27);
  border-radius: 30px;
  text-align: center;
  background: linear-gradient(120deg, rgba(16,57,101,.5), rgba(14,20,53,.9) 48%, rgba(73,22,105,.55));
  box-shadow: inset 0 1px rgba(255,255,255,.06), 0 30px 90px rgba(0,0,0,.3);
}
.download-section > *:not(.download-rings) { position: relative; z-index: 2; }
.download-rings { position: absolute; width: 700px; height: 700px; left: 50%; top: 50%; transform: translate(-50%,-50%); opacity: .26; }
.download-rings i { position: absolute; inset: 10%; border: 1px solid #477dff; border-radius: 50%; }
.download-rings i:nth-child(2) { inset: 24%; border-color: #6a4ff1; }
.download-rings i:nth-child(3) { inset: 38%; border-color: #a43be3; }
.download-icon { margin: 0 auto 28px; border-radius: 22px; box-shadow: 0 16px 46px rgba(29,80,255,.3); }
.download-section h2 { font-size: clamp(50px, 5.8vw, 80px); }
.download-section > p:not(.install-note) { max-width: 630px; margin: 24px auto 30px; color: #b6bfd1; font-size: 15px; line-height: 1.7; }
.install-note { max-width: 700px; margin: 25px auto 0; padding: 0 20px; color: #7f8aa2; font-size: 12px; line-height: 1.7; }

.site-footer { width: min(calc(100% - 2 * var(--gutter)), var(--content)); min-height: 130px; margin: 0 auto; display: flex; align-items: center; gap: 35px; }
.footer-brand { font-size: 15px; }
.footer-brand img { border-radius: 8px; }
.site-footer nav { display: flex; gap: 27px; margin-left: auto; }
.site-footer > p { margin: 0 0 0 20px; color: #606a7f; font-size: 12px; }

.reveal { opacity: 0; transform: translateY(22px); transition: opacity .75s ease, transform .75s cubic-bezier(.22,.72,.24,1); }
.reveal.visible { opacity: 1; transform: none; }

@media (max-width: 980px) {
  .hero { min-height: auto; grid-template-columns: 1fr; padding-top: 140px; }
  .hero-copy { max-width: 720px; }
  .desktop-stage { width: min(100%, 760px); margin: 20px auto 0; }
  .story, .appearance, .control, .players, .details { grid-template-columns: 1fr; }
  .appearance-demo { order: 2; }
  .appearance .section-copy { order: 1; }
  .sync-visual, .control-visual { width: min(100%, 760px); }
  .players, .details { gap: 55px; }
  .section-copy, .players-heading, .details-copy { max-width: 650px; }
}

@media (max-width: 720px) {
  :root { --gutter: 20px; }
  .header-inner { height: 68px; }
  .brand img { width: 34px; height: 34px; border-radius: 8px; }
  .main-nav, .header-download { display: none; }
  .menu-button { width: 42px; height: 42px; margin-left: auto; border: 0; border-radius: 11px; display: grid; align-content: center; justify-content: center; gap: 6px; background: rgba(255,255,255,.05); }
  .menu-button span { width: 19px; height: 1px; background: white; transition: transform .2s ease; }
  .menu-button[aria-expanded="true"] span:first-child { transform: translateY(3.5px) rotate(45deg); }
  .menu-button[aria-expanded="true"] span:last-child { transform: translateY(-3.5px) rotate(-45deg); }
  .mobile-nav { display: grid; grid-template-rows: repeat(4, auto); max-height: 0; overflow: hidden; background: rgba(5,7,17,.95); backdrop-filter: blur(22px); transition: max-height .25s ease; }
  .mobile-nav.open { max-height: 260px; border-bottom: 1px solid var(--line); }
  .mobile-nav a { padding: 15px var(--gutter); border-top: 1px solid var(--line); color: #c5cada; font-size: 14px; }
  .mobile-nav a:last-child { color: #70caff; }
  .hero { padding-top: 116px; padding-bottom: 75px; gap: 55px; }
  .hero h1 { font-size: clamp(52px, 17vw, 76px); }
  .hero-copy > p:not(.release-meta) { margin-top: 24px; font-size: 17px; line-height: 1.7; }
  .hero-actions { flex-direction: column; align-items: stretch; gap: 10px; margin-top: 30px; }
  .text-link { text-align: center; border: 0; }
  .release-meta { text-align: center; }
  .desktop-screen { aspect-ratio: .83 / 1; border-radius: 22px; }
  .mac-menu-bar span:nth-child(4), .mac-menu-bar span:nth-child(5) { display: none; }
  .lyric-panel-default { width: 88%; height: 40%; right: 6%; bottom: 14%; padding: 16px; }
  .lyric-stack p { font-size: 13px; }
  .figure-note { text-align: center; }
  .trust-strip { grid-template-columns: repeat(2, 1fr); padding: 0; }
  .trust-strip div { min-height: 95px; justify-content: center; border-bottom: 1px solid var(--line); }
  .trust-strip div:nth-child(2) { border-right: 0; }
  .trust-strip div:nth-child(3), .trust-strip div:nth-child(4) { border-bottom: 0; }
  .story, .appearance, .control, .players, .details { padding-top: 105px; padding-bottom: 45px; gap: 48px; }
  .section-copy h2, .players h2, .details h2 { font-size: 44px; }
  .large-lyrics p { font-size: 23px; }
  .appearance-demo { grid-template-columns: 1fr; }
  .preset, .preset-minimal, .preset-glass { grid-column: auto; }
  .shortcut-list span { font-size: 12px; padding-right: 8px; }
  .player-list > div { min-height: 78px; }
  .player-list strong { font-size: 17px; }
  .fact-list article { grid-template-columns: 58px 1fr; column-gap: 14px; }
  .download-section { width: calc(100% - 24px); margin-top: 80px; padding: 74px 18px; border-radius: 24px; }
  .download-section h2 { font-size: 47px; }
  .download-icon { width: 78px; height: 78px; border-radius: 18px; }
  .site-footer { min-height: 190px; padding: 35px 0; display: grid; grid-template-columns: 1fr auto; gap: 25px; }
  .site-footer nav { grid-column: 1 / -1; grid-row: 2; margin: 0; flex-wrap: wrap; }
  .site-footer > p { margin: 0; text-align: right; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
  .reveal { opacity: 1; transform: none; }
}