/* =========================================================
   Pellosy Music — App 下载页（新 × 旧 混合风格）
   深色厂商级质感 × 纸白编辑语言，动画丰富、丝滑。
   规则全部限定在 body.app-page 内。
   ========================================================= */

.app-page {
  --app-surface: #17191a;
  --app-surface-2: #1e2122;
  --app-surface-3: #25292a;
  color: var(--white);
  background: var(--ink);
}

.app-page [hidden] {
  display: none !important;
}

.app-page button,
.app-page input,
.app-page select {
  font: inherit;
}

/* ---------- 顶部导航（深色玻璃） ---------- */

.app-page .site-header {
  color: var(--white);
  background: rgba(16, 17, 18, .78);
  border-bottom: 1px solid rgba(248, 247, 241, .14);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.app-page .site-header.is-scrolled {
  box-shadow: 0 12px 32px rgba(0, 0, 0, .28);
}

.app-page .logo-shape,
.app-page .logo-shape span {
  border-color: var(--white);
}

.app-page .logo-shape span:last-child {
  background: var(--white);
}

.app-page .logo-name span {
  color: var(--orange);
}

.app-page .nav-link {
  color: rgba(248, 247, 241, .62);
}

.app-page .nav-link:hover {
  color: var(--white);
}

.app-page .nav-link::after {
  background: var(--white);
}

.app-page .nav-index {
  color: var(--acid);
}

.app-page .studio-status {
  color: rgba(248, 247, 241, .55);
}

.app-page .contact-button {
  color: var(--white);
  border-color: rgba(248, 247, 241, .35);
}

.app-page .contact-button:hover {
  color: var(--black);
  background: var(--acid);
  border-color: var(--acid);
}

.app-page .menu-toggle {
  color: var(--white);
  border-color: rgba(248, 247, 241, .25);
}

.app-page .mobile-navigation.is-open {
  background: var(--ink);
  border-top-color: rgba(248, 247, 241, .12);
}

.app-page .mobile-navigation a {
  color: var(--white);
  border-bottom-color: rgba(248, 247, 241, .12);
}

.app-page .mobile-navigation a span {
  color: var(--acid);
}

/* ---------- 首屏 ---------- */

.app-page .hero-section {
  color: var(--white);
  background: transparent;
}

.app-page .hero-grid-lines {
  background-image:
    linear-gradient(to right, transparent 49.9%, rgba(248, 247, 241, .07) 50%, transparent 50.1%),
    linear-gradient(to bottom, transparent 49.9%, rgba(248, 247, 241, .07) 50%, transparent 50.1%);
}

.app-page .hero-noise {
  opacity: .32;
  mix-blend-mode: screen;
}

.app-page .hero-orbit {
  border-color: rgba(248, 247, 241, .14);
}

.app-page .hero-topline,
.app-page .hero-bottomline {
  color: rgba(248, 247, 241, .55);
}

.app-page .hero-title {
  color: var(--white);
}

.app-page .hero-description {
  color: rgba(248, 247, 241, .62);
}

.app-page .scroll-icon {
  color: var(--white);
  border-color: rgba(248, 247, 241, .5);
}

.app-page .hero-marquee {
  color: rgba(248, 247, 241, .38);
}

.app-page .hero-page-number {
  color: var(--acid);
}

.app-page .aurora-blob {
  mix-blend-mode: screen;
  opacity: .42;
}

.aurora-blob-three {
  top: 30%;
  left: 10%;
  background: radial-gradient(
    circle at 50% 50%,
    rgba(185, 156, 255, .5),
    transparent 70%
  );
  animation: auroraDrift 24s ease-in-out infinite alternate;
}

/* 标题：模糊升起入场 */

.app-page .app-title span {
  opacity: 0;
  transform: translateY(70px);
  animation: appTitleReveal .95s var(--ease) forwards;
}

.app-page .app-title span:nth-child(1) {
  animation-delay: .35s;
}

.app-page .app-title span:nth-child(2) {
  animation-delay: .5s;
}

.app-page .app-title span:nth-child(3) {
  animation-delay: .65s;
}

@keyframes appTitleReveal {
  from {
    opacity: 0;
    transform: translateY(70px);
    filter: blur(10px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
    filter: blur(0);
  }
}

/* 渐变文字 */

.gradient-text {
  background: linear-gradient(
    100deg,
    var(--orange) 10%,
    var(--acid) 45%,
    var(--blue) 80%
  );
  background-size: 220% 100%;
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  animation: textShimmer 6s linear infinite;
}

/* 粒子与波形 */

.hero-particles {
  position: absolute;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
}

.hero-particles i {
  position: absolute;
  bottom: -14px;
  border-radius: 50%;
  background: var(--acid);
  opacity: 0;
  animation: particleRise 9s linear infinite;
}

@keyframes particleRise {
  0% {
    transform: translateY(0);
    opacity: 0;
  }

  12% {
    opacity: .8;
  }

  85% {
    opacity: .2;
  }

  100% {
    transform: translateY(-108vh);
    opacity: 0;
  }
}

.hero-wave {
  position: absolute;
  right: 6vw;
  bottom: 58px;
  left: 6vw;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
  height: 52px;
  opacity: .42;
  pointer-events: none;
}

.hero-wave i {
  width: 3px;
  height: 26%;
  background: linear-gradient(to top, var(--orange), var(--acid));
  animation: waveBar 1.5s ease-in-out infinite;
}

.hero-wave i:nth-child(2n) {
  background: linear-gradient(to top, var(--blue), var(--acid));
  animation-delay: .12s;
}

.hero-wave i:nth-child(3n) {
  animation-delay: .26s;
}

@keyframes waveBar {
  0%,
  100% {
    transform: scaleY(.3);
  }

  50% {
    transform: scaleY(1);
  }
}

/* 光标光晕 */

.cursor-glow {
  position: absolute;
  top: 0;
  left: 0;
  z-index: 1;
  width: 360px;
  height: 360px;
  border-radius: 50%;
  opacity: .26;
  pointer-events: none;
  mix-blend-mode: screen;
  background: radial-gradient(
    circle,
    rgba(217, 255, 56, .5),
    rgba(255, 104, 72, .2) 45%,
    transparent 70%
  );
  transform: translate(-220px, -220px);
}

/* ---------- 下载主区 ---------- */

.app-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 28px;
  padding: 7px 12px;
  color: var(--acid);
  border: 1px solid rgba(217, 255, 56, .35);
  font-size: 10px;
  letter-spacing: .14em;
  text-transform: uppercase;
}

.app-badge i {
  width: 6px;
  height: 6px;
  background: var(--acid);
  border-radius: 50%;
  box-shadow: 0 0 0 4px rgba(217, 255, 56, .14);
  animation: statusPulse 2s ease-out infinite;
}

.download-actions {
  display: flex;
  align-items: stretch;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 34px;
}

.download-main {
  position: relative;
  min-width: 260px;
  min-height: 62px;
  display: grid;
  grid-template-columns: 1fr auto;
  grid-template-rows: auto auto;
  align-items: center;
  gap: 2px 16px;
  padding: 10px 18px 10px 20px;
  overflow: hidden;
  color: var(--black);
  background: var(--acid);
  border: 1px solid var(--acid);
  cursor: pointer;
  text-align: left;
  box-shadow: 10px 10px 0 rgba(217, 255, 56, .18);
  transition:
    background .3s ease,
    color .3s ease,
    box-shadow .3s var(--ease),
    transform .3s var(--ease);
}

.download-main::after {
  content: "";
  position: absolute;
  top: -24%;
  bottom: -24%;
  left: -70%;
  width: 42%;
  background: linear-gradient(
    100deg,
    transparent,
    rgba(255, 255, 255, .55),
    transparent
  );
  transform: skewX(-22deg);
  animation: btnShine 3.2s ease-in-out infinite;
}

@keyframes btnShine {
  0%,
  52% {
    left: -70%;
  }

  85%,
  100% {
    left: 140%;
  }
}

.download-main > span:first-child {
  position: relative;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .03em;
}

.download-main-sub {
  position: relative;
  grid-column: 1;
  color: rgba(16, 17, 18, .58);
  font-size: 9px;
  letter-spacing: .08em;
}

.download-main .button-icon {
  position: relative;
  grid-row: span 2;
  font-size: 22px;
  transition: transform .35s var(--ease);
}

.download-main:hover {
  color: var(--white);
  background: var(--orange);
  border-color: var(--orange);
  box-shadow: 10px 10px 0 rgba(255, 104, 72, .2);
  transform: translateY(-3px);
}

.download-main:hover .button-icon {
  transform: translate(4px, -4px);
}

.web-soon {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: 62px;
  padding: 0 18px;
  color: rgba(248, 247, 241, .7);
  background: rgba(248, 247, 241, .06);
  border: 1px solid rgba(248, 247, 241, .22);
  cursor: pointer;
  font-size: 12px;
  letter-spacing: .04em;
  transition:
    color .3s ease,
    background .3s ease,
    border-color .3s ease,
    transform .3s var(--ease);
}

.web-soon:hover {
  color: var(--white);
  background: rgba(217, 255, 56, .08);
  border-color: var(--acid);
  transform: translateY(-2px);
}

.soon-dot {
  width: 7px;
  height: 7px;
  background: var(--acid);
  border-radius: 50%;
  box-shadow: 0 0 0 4px rgba(217, 255, 56, .15);
  animation: statusPulse 2s ease-out infinite;
}

.platform-row {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 26px;
  color: rgba(248, 247, 241, .45);
  font-size: 10px;
  letter-spacing: .08em;
}

.platform-row button {
  position: relative;
  padding: 5px 10px;
  color: rgba(248, 247, 241, .68);
  background: transparent;
  border: 1px solid rgba(248, 247, 241, .18);
  cursor: pointer;
  font-size: 10px;
  transition:
    color .2s ease,
    border-color .2s ease,
    background .2s ease,
    transform .2s var(--ease);
}

.platform-row button:hover {
  color: var(--black);
  background: var(--acid);
  border-color: var(--acid);
  transform: translateY(-2px);
}

.platform-row button.is-recommended {
  color: var(--black);
  background: var(--acid);
  border-color: var(--acid);
}

.platform-row button.is-recommended::after {
  content: "推荐";
  position: absolute;
  top: -9px;
  right: -7px;
  padding: 2px 5px;
  color: var(--white);
  background: var(--orange);
  font-size: 8px;
  letter-spacing: .06em;
  animation: badgePop .5s var(--ease) both;
}

@keyframes badgePop {
  from {
    opacity: 0;
    transform: scale(.5);
  }

  to {
    opacity: 1;
    transform: scale(1);
  }
}

.app-meta {
  margin-top: 22px;
  color: rgba(248, 247, 241, .38);
  font-size: 10px;
  letter-spacing: .06em;
}

/* ---------- 黑胶唱片 ---------- */

.app-page .album-glyph {
  display: none;
}

.album-art {
  position: relative;
  aspect-ratio: 1;
  display: grid;
  place-items: center;
  overflow: hidden;
  background: #0d0e0f;
}

.album-art::after {
  content: "";
  position: absolute;
  inset: 0;
  opacity: .14;
  background-image: repeating-linear-gradient(
    135deg,
    transparent 0,
    transparent 7px,
    rgba(255, 255, 255, .5) 8px,
    transparent 9px
  );
}

.album-label {
  position: absolute;
  top: 16px;
  left: 16px;
  z-index: 2;
  color: rgba(248, 247, 241, .8);
  font-size: 10px;
  letter-spacing: .16em;
  line-height: 1.5;
}

.vinyl {
  position: absolute;
  inset: 0;
  z-index: 1;
  display: grid;
  place-items: center;
}

.vinyl-scroll {
  will-change: transform;
}

.vinyl-disc {
  position: relative;
  width: 72%;
  aspect-ratio: 1;
  border-radius: 50%;
  background:
    radial-gradient(circle at 50% 50%, #0a0a0a 0 15%, #161616 16% 22%, transparent 23%),
    repeating-radial-gradient(
      circle at 50% 50%,
      #191919 0 3px,
      #0d0d0d 3px 6px
    );
  box-shadow:
    0 24px 48px rgba(0, 0, 0, .55),
    inset 0 0 0 1px rgba(255, 255, 255, .07);
  animation: vinylSpin 7s linear infinite;
}

.vinyl-disc::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: conic-gradient(
    from 0deg,
    transparent 0 58%,
    rgba(255, 255, 255, .1) 62%,
    transparent 72%,
    rgba(255, 255, 255, .05) 84%,
    transparent 92%
  );
  mix-blend-mode: screen;
}

.vinyl-groove {
  position: absolute;
  border: 1px solid rgba(255, 255, 255, .05);
  border-radius: 50%;
}

.groove-one {
  inset: 27%;
}

.groove-two {
  inset: 34%;
}

.groove-three {
  inset: 41%;
}

.vinyl-label {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 23%;
  aspect-ratio: 1;
  display: grid;
  place-items: center;
  color: var(--black);
  background: var(--acid);
  border-radius: 50%;
  font-family: var(--serif);
  font-size: clamp(14px, 2vw, 22px);
  font-style: italic;
  font-weight: 700;
  box-shadow: 0 0 0 3px rgba(0, 0, 0, .35);
  transform: translate(-50%, -50%);
}

@keyframes vinylSpin {
  to {
    transform: rotate(360deg);
  }
}

.equalizer {
  position: absolute;
  right: 16px;
  bottom: 14px;
  z-index: 2;
  display: flex;
  align-items: flex-end;
  gap: 3px;
  height: 28px;
}

.equalizer i {
  width: 4px;
  height: 24%;
  display: block;
  background: var(--acid);
  animation: equalizerBar 1.1s ease-in-out infinite;
}

.phone-frame:not(.is-playing) .equalizer i {
  animation-play-state: paused;
}

.equalizer i:nth-child(2n) {
  background: var(--orange);
  animation-delay: .18s;
}

.equalizer i:nth-child(3n) {
  background: var(--white);
  animation-delay: .34s;
}

@keyframes equalizerBar {
  0%,
  100% {
    height: 18%;
  }

  50% {
    height: 100%;
  }
}

.player-info {
  padding: 16px 10px 0;
  color: var(--white);
}

.player-info strong {
  display: block;
  font-size: 16px;
  letter-spacing: -.03em;
}

.player-info span {
  display: block;
  margin-top: 4px;
  color: rgba(248, 247, 241, .55);
  font-size: 10px;
}

.player-progress {
  height: 3px;
  margin: 16px 10px 0;
  overflow: hidden;
  background: rgba(248, 247, 241, .18);
}

.player-progress-fill {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--orange), var(--acid));
  transform-origin: left center;
  transform: scaleX(.38);
  animation: progressPulse 16s ease-in-out infinite alternate;
}

@keyframes progressPulse {
  from {
    transform: scaleX(.38);
  }

  to {
    transform: scaleX(.74);
  }
}

.player-times {
  display: flex;
  justify-content: space-between;
  padding: 8px 10px 0;
  color: rgba(248, 247, 241, .45);
  font-size: 9px;
}

.player-controls {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 34px;
  padding: 16px 0 12px;
}

.player-controls button {
  color: var(--white);
  background: transparent;
  border: 0;
  cursor: pointer;
  font-size: 17px;
  transition: color .2s ease, transform .2s var(--ease);
}

.player-controls button:hover {
  color: var(--acid);
  transform: scale(1.15);
}

.player-controls .pc-play {
  width: 52px;
  height: 52px;
  display: grid;
  place-items: center;
  color: var(--black);
  background: var(--acid);
  border-radius: 50%;
  font-size: 15px;
}

.player-controls .pc-play:hover {
  color: var(--white);
  background: var(--orange);
}

.phone-bottom {
  padding: 0 10px 8px;
  color: rgba(248, 247, 241, .4);
  font-size: 8px;
  letter-spacing: .12em;
}

.music-float-card {
  width: 118px;
}

.music-float-card.card-a {
  top: 7%;
  left: -5%;
  animation: floatingCardOne 6s ease-in-out infinite;
}

.music-float-card.card-b {
  right: 6px;
  bottom: 8%;
  background: var(--blue);
  animation: musicCardFloatB 7s ease-in-out infinite;
}

@keyframes musicCardFloatB {
  0%,
  100% {
    transform: rotate(-8deg) translate(0, 0);
  }

  50% {
    transform: rotate(-11deg) translate(0, -10px);
  }
}

/* ---------- 大字描边跑马灯 ---------- */

.outline-marquee {
  overflow: hidden;
  padding: 26px 0;
  background: var(--ink);
  border-top: 1px solid rgba(248, 247, 241, .1);
  border-bottom: 1px solid rgba(248, 247, 241, .1);
}

.outline-marquee-track {
  display: flex;
  width: max-content;
  animation: outlineMarquee 26s linear infinite;
}

.outline-marquee-track:hover {
  animation-play-state: paused;
}

.outline-marquee-track span {
  padding: 0 3vw;
  color: transparent;
  -webkit-text-stroke: 1px rgba(248, 247, 241, .28);
  font-size: clamp(46px, 8vw, 112px);
  font-weight: 700;
  letter-spacing: -.06em;
  line-height: 1;
  white-space: nowrap;
}

.outline-marquee-track span:nth-child(even) {
  -webkit-text-stroke: 1px rgba(255, 104, 72, .55);
}

@keyframes outlineMarquee {
  to {
    transform: translateX(-50%);
  }
}

/* ---------- 数据条 ---------- */

.app-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  background: var(--app-surface);
  border-top: 1px solid rgba(248, 247, 241, .08);
  border-bottom: 1px solid rgba(248, 247, 241, .08);
}

.stat-cell {
  padding: 34px 6vw 38px;
  text-align: center;
  border-right: 1px solid rgba(248, 247, 241, .08);
}

.stat-cell:last-child {
  border-right: 0;
}

.stat-cell strong {
  display: block;
  background: linear-gradient(
    100deg,
    var(--white) 20%,
    rgba(248, 247, 241, .45)
  );
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  font-size: clamp(30px, 4vw, 52px);
  font-weight: 700;
  letter-spacing: -.06em;
  line-height: 1;
}

.stat-cell strong::after {
  content: "";
  width: 46px;
  height: 3px;
  display: block;
  margin: 12px auto 0;
  background: linear-gradient(90deg, var(--orange), var(--acid));
}

.stat-cell span {
  display: block;
  margin-top: 12px;
  color: rgba(248, 247, 241, .5);
  font-size: 10px;
  letter-spacing: .12em;
  text-transform: uppercase;
}

/* ---------- 区块通用 ---------- */

.app-page .section-marker {
  color: rgba(248, 247, 241, .5);
}

.app-page .section-marker span:first-child {
  color: var(--acid);
}

.app-page .section-kicker {
  color: var(--orange);
}

.app-section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 40px;
  flex-wrap: wrap;
  margin: 70px 0 56px;
}

.app-section-head h2 {
  color: var(--white);
  font-size: clamp(38px, 5vw, 74px);
  letter-spacing: -.09em;
  line-height: .96;
}

.app-section-head h2 em {
  color: var(--orange);
  font-family: var(--serif);
  font-style: italic;
  font-weight: 400;
}

.app-section-head p {
  max-width: 300px;
  margin-bottom: 10px;
  color: rgba(248, 247, 241, .55);
  font-size: 13px;
  line-height: 1.8;
}

/* ---------- 功能（Bento） ---------- */

.app-features,
.app-requirements,
.app-faq {
  background: transparent;
}

.feature-icon {
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  color: var(--black);
  background: var(--acid);
  font-size: 20px;
  transition: transform .45s var(--ease), background .3s ease;
}

.bento-cell:hover .feature-icon {
  background: var(--orange);
  transform: rotate(-10deg) scale(1.14);
}

.bento-cell-accent .feature-icon {
  color: var(--white);
  background: var(--ink);
}

/* ---------- 02 功能（播放列表式） ---------- */

.features-head .head-side {
  display: flex;
  align-items: flex-end;
  gap: 26px;
  flex-wrap: wrap;
}

.head-eq {
  display: flex;
  align-items: flex-end;
  gap: 3px;
  height: 34px;
}

.head-eq i {
  width: 4px;
  height: 22%;
  background: linear-gradient(to top, var(--orange), var(--acid));
  animation: equalizerBar 1.1s ease-in-out infinite;
}

.head-eq i:nth-child(2n) {
  background: linear-gradient(to top, var(--blue), var(--acid));
  animation-delay: .14s;
}

.head-eq i:nth-child(3n) {
  animation-delay: .28s;
}

.play-all {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 16px;
  color: var(--black);
  background: var(--acid);
  border: 1px solid var(--acid);
  cursor: pointer;
  font-size: 11px;
  letter-spacing: .05em;
  transition:
    color .3s ease,
    background .3s ease,
    border-color .3s ease,
    transform .3s var(--ease);
}

.play-all:hover {
  color: var(--white);
  background: var(--orange);
  border-color: var(--orange);
  transform: translateY(-2px);
}

.play-all.is-active {
  color: var(--white);
  background: var(--orange);
  border-color: var(--orange);
}

.play-all-icon {
  font-size: 12px;
}

.feature-tracks {
  border-top: 1px solid rgba(248, 247, 241, .12);
}

.feature-track {
  position: relative;
  display: grid;
  grid-template-columns: 56px 1fr auto 64px;
  align-items: center;
  gap: 18px;
  padding: 26px 18px;
  overflow: hidden;
  border-bottom: 1px solid rgba(248, 247, 241, .12);
  cursor: pointer;
  transition:
    background .3s ease,
    padding-left .35s var(--ease);
}

.feature-track::after {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: 3px;
  background: var(--acid);
  transform: scaleY(0);
  transform-origin: top center;
  transition: transform .35s var(--ease);
}

.feature-track:hover,
.feature-track.is-playing {
  padding-left: 26px;
  background: rgba(248, 247, 241, .05);
}

.feature-track:hover::after,
.feature-track.is-playing::after {
  transform: scaleY(1);
}

.feature-track.is-featured {
  background: rgba(217, 255, 56, .06);
}

.track-no {
  color: rgba(248, 247, 241, .35);
  font-size: 11px;
  letter-spacing: .1em;
  transition: color .3s ease;
}

.feature-track:hover .track-no,
.feature-track.is-playing .track-no {
  color: var(--acid);
}

.track-copy h3 {
  color: var(--white);
  font-size: clamp(18px, 2.2vw, 26px);
  letter-spacing: -.04em;
  transition: color .3s ease;
}

.feature-track:hover .track-copy h3,
.feature-track.is-playing .track-copy h3 {
  color: var(--acid);
}

.track-copy p {
  margin-top: 6px;
  color: rgba(248, 247, 241, .5);
  font-size: 12px;
}

.track-eq {
  display: flex;
  align-items: flex-end;
  gap: 3px;
  height: 22px;
  opacity: .25;
  transition: opacity .3s ease;
}

.feature-track:hover .track-eq,
.feature-track.is-playing .track-eq {
  opacity: 1;
}

.track-eq i {
  width: 3px;
  height: 24%;
  background: var(--acid);
  animation: equalizerBar 1s ease-in-out infinite;
}

.track-eq i:nth-child(2n) {
  background: var(--orange);
  animation-delay: .16s;
}

.track-eq i:nth-child(3n) {
  background: var(--blue);
  animation-delay: .32s;
}

.feature-track:not(.is-playing) .track-eq i {
  animation-play-state: paused;
}

.track-dur {
  color: rgba(248, 247, 241, .38);
  font-size: 11px;
  letter-spacing: .05em;
  text-align: right;
}

.feature-track.is-featured .track-dur {
  color: var(--acid);
}

/* ---------- 旧风格 · 纸白编辑区 ---------- */

.paper-section {
  position: relative;
  padding: 140px 6vw 90px;
  overflow: hidden;
  color: var(--ink);
  background: var(--paper);
}

.paper-grid {
  position: absolute;
  inset: 0;
  opacity: .5;
  background-image:
    linear-gradient(to right, transparent 49.9%, var(--line) 50%, transparent 50.1%),
    linear-gradient(to bottom, transparent 49.9%, var(--line) 50%, transparent 50.1%);
  background-size: 25% 100%, 100% 25%;
  mask-image: linear-gradient(to bottom, transparent, #000 22%, #000 78%, transparent);
  pointer-events: none;
}

.paper-content {
  position: relative;
  z-index: 1;
  max-width: 980px;
}

.paper-kicker {
  color: var(--orange);
  font-size: 10px;
  letter-spacing: .14em;
  text-transform: uppercase;
}

.paper-content h2 {
  margin-top: 28px;
  font-size: clamp(46px, 7vw, 112px);
  letter-spacing: -.1em;
  line-height: .92;
}

.paper-content h2 em {
  color: var(--orange);
  font-family: var(--serif);
  font-style: italic;
  font-weight: 400;
}

.paper-lead {
  max-width: 540px;
  margin-top: 36px;
  color: var(--ink-soft);
  font-size: 14px;
  line-height: 1.9;
}

.paper-tags {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 36px;
}

.paper-tags span {
  padding: 7px 13px;
  color: var(--ink);
  border: 1px solid var(--line);
  font-size: 10px;
  letter-spacing: .12em;
  transition: color .25s ease, background .25s ease, border-color .25s ease;
}

.paper-tags span:hover {
  color: var(--white);
  background: var(--ink);
  border-color: var(--ink);
}

.paper-marquee {
  margin-top: 90px;
  padding-top: 18px;
  overflow: hidden;
  border-top: 1px solid var(--line);
  color: var(--ink-soft);
  font-size: 11px;
  letter-spacing: .12em;
}

.paper-marquee span {
  display: inline-block;
  white-space: nowrap;
  animation: marquee 14s linear infinite;
}

/* ---------- 小号跑马灯 ---------- */

.outline-marquee.is-small {
  padding: 14px 0;
}

.outline-marquee.is-small span {
  font-size: clamp(22px, 3.4vw, 42px);
}

.outline-marquee-track.is-reverse {
  animation-direction: reverse;
}

/* ---------- 界面预览 ---------- */

.app-experience {
  background: var(--app-surface);
  border-top: 1px solid rgba(248, 247, 241, .08);
  border-bottom: 1px solid rgba(248, 247, 241, .08);
}

.experience-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(420px, 1.05fr);
  gap: 6vw;
  align-items: center;
}

.experience-copy h2 {
  color: var(--white);
  font-size: clamp(36px, 5vw, 70px);
  letter-spacing: -.09em;
  line-height: .98;
}

.experience-copy h2 em {
  color: var(--orange);
  font-family: var(--serif);
  font-style: italic;
  font-weight: 400;
}

.experience-lead {
  max-width: 430px;
  margin-top: 28px;
  color: rgba(248, 247, 241, .58);
  font-size: 14px;
  line-height: 1.85;
}

.app-page .underlined-link {
  color: var(--white);
  border-bottom-color: rgba(248, 247, 241, .6);
}

.app-page .underlined-link:hover {
  color: var(--acid);
  border-bottom-color: var(--acid);
}

.app-window-wrap {
  position: relative;
  display: grid;
  place-items: center;
  perspective: 1200px;
}

.app-window {
  position: relative;
  z-index: 2;
  width: min(560px, 100%);
  background: var(--app-surface-2);
  border: 1px solid rgba(248, 247, 241, .14);
  box-shadow: 26px 30px 0 rgba(0, 0, 0, .3);
}

.window-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 12px 16px;
  color: rgba(248, 247, 241, .5);
  border-bottom: 1px solid rgba(248, 247, 241, .1);
  font-size: 9px;
  letter-spacing: .1em;
}

.window-dots {
  display: flex;
  gap: 6px;
}

.window-dots i {
  width: 9px;
  height: 9px;
  display: block;
  border-radius: 50%;
  background: var(--orange);
}

.window-dots i:nth-child(2) {
  background: var(--acid);
}

.window-dots i:nth-child(3) {
  background: var(--blue);
}

.window-status {
  color: var(--acid);
}

.window-chip-a {
  top: -3%;
  left: -5%;
}

.window-chip-b {
  right: 6px;
  bottom: -3%;
  background: var(--blue);
  animation: musicCardFloatB 7s ease-in-out infinite;
}

.window-body {
  display: grid;
  grid-template-columns: 118px 1fr;
  min-height: 380px;
}

.window-sidebar {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 16px 10px;
  background: var(--app-surface-3);
  border-right: 1px solid rgba(248, 247, 241, .08);
}

.window-sidebar a {
  padding: 9px 12px;
  color: rgba(248, 247, 241, .48);
  font-size: 9px;
  letter-spacing: .12em;
  transition: color .2s ease, background .2s ease, transform .2s var(--ease);
}

.window-sidebar a:hover {
  color: var(--white);
  transform: translateX(3px);
}

.window-sidebar a.is-active {
  color: var(--black);
  background: var(--acid);
}

.window-main {
  padding: 18px;
}

.now-playing {
  display: flex;
  align-items: center;
  gap: 14px;
  padding-bottom: 16px;
  border-bottom: 1px solid rgba(248, 247, 241, .1);
}

.mini-album {
  position: relative;
  width: 54px;
  height: 54px;
  display: grid;
  place-items: center;
  flex-shrink: 0;
  overflow: hidden;
  background: #0d0e0f;
}

.mini-vinyl-scroll {
  will-change: transform;
}

.mini-vinyl {
  position: relative;
  width: 100%;
  aspect-ratio: 1;
  border-radius: 50%;
  background: repeating-radial-gradient(
    circle at 50% 50%,
    #1a1a1a 0 2px,
    #0d0d0d 2px 4px
  );
  animation: vinylSpin 6s linear infinite;
}

.mini-vinyl-label {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 36%;
  aspect-ratio: 1;
  display: grid;
  place-items: center;
  color: var(--black);
  background: var(--orange);
  border-radius: 50%;
  font-family: var(--serif);
  font-size: 9px;
  font-style: italic;
  font-weight: 700;
  transform: translate(-50%, -50%);
}

.now-playing strong,
.now-playing > div > span {
  display: block;
}

.now-playing strong {
  color: var(--white);
  font-size: 14px;
}

.now-playing > div > span {
  margin-top: 3px;
  color: rgba(248, 247, 241, .48);
  font-size: 10px;
}

.mini-equalizer {
  display: flex;
  align-items: flex-end;
  gap: 3px;
  height: 18px;
  margin-top: 8px;
}

.mini-equalizer i {
  width: 3px;
  height: 26%;
  display: block;
  background: var(--acid);
  animation: equalizerBar 1s ease-in-out infinite;
}

.mini-equalizer i:nth-child(2n) {
  background: var(--orange);
  animation-delay: .15s;
}

.mini-equalizer i:nth-child(3n) {
  background: var(--blue);
  animation-delay: .3s;
}

.playlist {
  margin-top: 10px;
}

.playlist li {
  display: grid;
  grid-template-columns: 26px 1fr auto;
  align-items: center;
  gap: 10px;
  padding: 11px 8px;
  color: rgba(248, 247, 241, .66);
  font-size: 11px;
  border-radius: 4px;
  transition:
    color .2s ease,
    background .2s ease,
    transform .2s var(--ease);
}

.playlist li:hover {
  color: var(--white);
  background: rgba(248, 247, 241, .06);
  transform: translateX(4px);
}

.playlist li.is-playing {
  color: var(--acid);
}

.playlist li span {
  color: rgba(248, 247, 241, .35);
  font-size: 9px;
}

.playlist li em {
  font-style: normal;
  font-size: 10px;
}

.window-wave {
  display: flex;
  align-items: center;
  gap: 3px;
  height: 26px;
  margin-top: 14px;
  opacity: .8;
}

.window-wave i {
  flex: 1;
  height: 28%;
  background: linear-gradient(to top, var(--orange), var(--acid));
  animation: equalizerBar 1.2s ease-in-out infinite;
}

.window-wave i:nth-child(2n) {
  background: linear-gradient(to top, var(--blue), var(--acid));
  animation-delay: .16s;
}

.window-wave i:nth-child(3n) {
  animation-delay: .32s;
}

/* ---------- 系统要求 ---------- */

.requirements-duo {
  display: grid;
  grid-template-columns: 1.15fr .85fr;
  gap: 16px;
  align-items: stretch;
}

.requirement-main,
.requirement-soon {
  position: relative;
  padding: 30px;
  overflow: hidden;
}

.requirement-main {
  background: var(--app-surface);
  border: 1px solid rgba(217, 255, 56, .45);
}

.requirement-main::before {
  content: "";
  position: absolute;
  inset: 0;
  padding: 1px;
  pointer-events: none;
  background: conic-gradient(
    from var(--ring-angle, 0deg),
    transparent 0 60%,
    var(--acid) 82%,
    var(--orange) 94%,
    transparent
  );
  -webkit-mask:
    linear-gradient(#000 0 0) content-box,
    linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  animation: ringSpin 4s linear infinite;
}

@property --ring-angle {
  syntax: "<angle>";
  initial-value: 0deg;
  inherits: false;
}

@keyframes ringSpin {
  to {
    --ring-angle: 360deg;
  }
}

.requirement-soon {
  background: var(--app-surface-2);
  border: 1px solid rgba(248, 247, 241, .14);
}

.req-platform {
  color: var(--acid);
  font-size: 10px;
  letter-spacing: .16em;
}

.requirement-soon .req-platform {
  color: rgba(248, 247, 241, .45);
}

.requirement-main .req-icon,
.requirement-soon .req-icon {
  margin-top: 22px;
  width: 48px;
  height: 48px;
  font-size: 20px;
}

.requirement-soon .req-icon {
  color: rgba(248, 247, 241, .55);
  background: rgba(248, 247, 241, .14);
  animation: none;
}

.requirement-main h3,
.requirement-soon h3 {
  margin-top: 18px;
  color: var(--white);
  font-size: 22px;
  letter-spacing: -.04em;
}

.req-version {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-top: 16px;
}

.req-version strong {
  background: linear-gradient(90deg, var(--acid), var(--orange));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  font-size: clamp(24px, 3vw, 34px);
  letter-spacing: -.05em;
}

.req-version small {
  color: rgba(248, 247, 241, .45);
  font-size: 10px;
  letter-spacing: .08em;
}

.soon-copy {
  margin-top: 12px;
  color: rgba(248, 247, 241, .5);
  font-size: 12px;
}

.soon-bar {
  height: 6px;
  margin-top: 22px;
  overflow: hidden;
  background: rgba(248, 247, 241, .12);
  border-radius: 99px;
}

.soon-bar span {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--orange), var(--acid));
  border-radius: 99px;
  animation: soonFill 2.6s var(--ease) forwards;
  animation-delay: .3s;
}

@keyframes soonFill {
  to {
    width: 68%;
  }
}

.soon-meta {
  display: flex;
  justify-content: space-between;
  margin-top: 10px;
  color: rgba(248, 247, 241, .45);
  font-size: 10px;
  letter-spacing: .08em;
}

.soon-meta b {
  color: var(--acid);
  font-weight: 400;
}

.requirement-card {
  padding: 24px;
  background: var(--app-surface);
  border: 1px solid rgba(248, 247, 241, .1);
  transition:
    border-color .3s ease,
    transform .3s var(--ease),
    box-shadow .3s var(--ease);
}

.requirement-card:hover {
  border-color: rgba(217, 255, 56, .55);
  box-shadow: 0 18px 38px rgba(0, 0, 0, .28);
  transform: translateY(-6px);
}

.req-icon {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  color: var(--black);
  background: var(--acid);
  font-size: 18px;
  animation: reqIconPulse 3.2s ease-in-out infinite;
}

.requirement-card:nth-child(2) .req-icon {
  animation-delay: .4s;
}

.requirement-card:nth-child(3) .req-icon {
  animation-delay: .8s;
}

.requirement-card:nth-child(4) .req-icon {
  animation-delay: 1.2s;
}

@keyframes reqIconPulse {
  0%,
  100% {
    transform: scale(1);
  }

  50% {
    transform: scale(1.1) rotate(-4deg);
  }
}

.requirement-card h3 {
  margin-top: 18px;
  color: var(--white);
  font-size: 18px;
  letter-spacing: -.04em;
}

.requirement-card ul {
  margin-top: 12px;
}

.requirement-card li {
  padding: 5px 0;
  color: rgba(248, 247, 241, .5);
  font-size: 11px;
  list-style: none;
}

.requirement-card li::before {
  content: "·";
  margin-right: 8px;
  color: var(--orange);
}

.req-download {
  width: 100%;
  min-height: 38px;
  margin-top: 18px;
  color: var(--white);
  background: transparent;
  border: 1px solid rgba(248, 247, 241, .28);
  cursor: pointer;
  font-size: 10px;
  letter-spacing: .06em;
  transition:
    color .25s ease,
    background .25s ease,
    border-color .25s ease,
    transform .25s var(--ease);
}

.req-download:hover {
  color: var(--black);
  background: var(--acid);
  border-color: var(--acid);
  transform: translateY(-2px);
}

.requirement-main .req-download {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 24px;
  min-height: 46px;
}

.requirement-main .req-download b {
  font-weight: 400;
}

.requirement-soon .req-download[disabled] {
  opacity: .55;
  cursor: not-allowed;
}

.requirement-soon .req-download[disabled]:hover {
  color: var(--white);
  background: transparent;
  border-color: rgba(248, 247, 241, .28);
  transform: none;
}

/* ---------- 版本历史（纸白版） ---------- */

.app-changelog.is-paper {
  color: var(--ink);
  background: var(--paper);
}

.app-changelog.is-paper .section-marker {
  color: var(--ink-soft);
}

.app-changelog.is-paper .app-section-head h2 {
  color: var(--ink);
}

.app-changelog.is-paper .changelog::before {
  background: var(--line);
}

.app-changelog.is-paper .changelog-entry::before {
  background: var(--paper);
  border-color: var(--orange);
  animation: changelogPulse 2.4s ease-in-out infinite;
}

@keyframes changelogPulse {
  0%,
  100% {
    box-shadow: 0 0 0 0 rgba(255, 104, 72, .35);
  }

  50% {
    box-shadow: 0 0 0 7px rgba(255, 104, 72, 0);
  }
}

.app-changelog.is-paper .changelog-entry time {
  color: var(--ink-soft);
}

.app-changelog.is-paper .changelog-entry h3 {
  color: var(--ink);
}

.app-changelog.is-paper .changelog-entry li {
  color: var(--ink-soft);
}

.app-changelog.is-paper .changelog-entry li::before {
  color: var(--orange);
}

.latest-version {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
  padding: 12px 16px;
  color: var(--ink);
  background: var(--acid);
  font-size: 11px;
  letter-spacing: .08em;
  animation: latestGlow 2.6s ease-in-out infinite;
}

.latest-version i {
  width: 7px;
  height: 7px;
  background: var(--ink);
  border-radius: 50%;
  animation: statusPulse 2s ease-out infinite;
}

.latest-version strong {
  font-size: 13px;
}

@keyframes latestGlow {
  0%,
  100% {
    box-shadow: 8px 8px 0 rgba(23, 23, 23, .12);
  }

  50% {
    box-shadow: 8px 8px 0 rgba(255, 104, 72, .38);
  }
}

.entry-tags {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 14px;
}

.entry-tags span {
  padding: 4px 9px;
  color: var(--ink);
  border: 1px solid var(--line);
  font-size: 8px;
  letter-spacing: .12em;
}

.changelog {
  position: relative;
  display: flex;
  flex-direction: column;
}

.changelog::before {
  content: "";
  position: absolute;
  top: 10px;
  bottom: 10px;
  left: 6px;
  width: 1px;
  background: rgba(248, 247, 241, .16);
}

.changelog-entry {
  position: relative;
  padding: 8px 0 34px 42px;
}

.changelog-entry::before {
  content: "";
  position: absolute;
  top: 18px;
  left: 1px;
  width: 11px;
  height: 11px;
  background: var(--ink);
  border: 2px solid var(--acid);
  border-radius: 50%;
}

.version-badge {
  display: inline-block;
  padding: 4px 10px;
  color: var(--black);
  background: var(--acid);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: .06em;
  box-shadow: 0 0 0 4px rgba(217, 255, 56, .16);
}

.changelog-entry time {
  margin-left: 10px;
  color: rgba(248, 247, 241, .4);
  font-size: 10px;
  letter-spacing: .08em;
}

.changelog-entry h3 {
  margin-top: 14px;
  color: var(--white);
  font-size: 20px;
  letter-spacing: -.04em;
}

.changelog-entry ul {
  margin-top: 10px;
}

.changelog-entry li {
  padding: 4px 0;
  color: rgba(248, 247, 241, .56);
  font-size: 12px;
  list-style: none;
}

.changelog-entry li::before {
  content: "＋";
  margin-right: 10px;
  color: var(--orange);
  font-size: 10px;
}

/* ---------- FAQ ---------- */

.faq-list {
  max-width: 860px;
}

.faq-item {
  border-bottom: 1px solid rgba(248, 247, 241, .12);
}

.faq-item summary {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 22px 4px;
  color: var(--white);
  cursor: pointer;
  list-style: none;
  transition: color .2s ease;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary:hover {
  color: var(--acid);
}

.faq-item summary span {
  color: var(--orange);
  font-size: 10px;
  letter-spacing: .1em;
}

.faq-item summary strong {
  flex: 1;
  font-size: 15px;
  font-weight: 400;
}

.faq-item summary b {
  font-size: 18px;
  font-weight: 400;
  transition: transform .35s var(--ease);
}

.faq-item[open] summary b {
  transform: rotate(45deg);
}

.faq-answer {
  display: grid;
  grid-template-rows: 0fr;
  padding: 0 4px 0 40px;
  transition: grid-template-rows .5s var(--ease);
}

.faq-answer .faq-inner {
  min-height: 0;
  overflow: hidden;
}

.faq-answer .faq-inner p {
  padding-bottom: 22px;
  color: rgba(248, 247, 241, .58);
  font-size: 13px;
  line-height: 1.85;
}

.faq-item[open] .faq-answer {
  grid-template-rows: 1fr;
}

/* ---------- 轻提示 ---------- */

.app-toast {
  position: fixed;
  bottom: 28px;
  left: 50%;
  z-index: 9999;
  max-width: min(430px, calc(100vw - 36px));
  padding: 13px 18px;
  color: var(--white);
  background: var(--app-surface-3);
  border: 1px solid rgba(217, 255, 56, .55);
  box-shadow: 6px 6px 0 var(--orange);
  font-size: 12px;
  letter-spacing: .03em;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translate(-50%, 14px);
  transition:
    opacity .3s var(--ease),
    transform .3s var(--ease),
    visibility .3s;
}

.app-toast.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translate(-50%, 0);
}

/* ---------- 响应式 ---------- */

@media (max-width: 1000px) {
  .app-page .app-hero-layout {
    grid-template-columns: 1fr;
    gap: 64px;
  }

  .app-page .music-visual {
    order: 2;
    min-height: 0;
    padding: 20px 0 10px;
  }

  .experience-layout {
    grid-template-columns: 1fr;
    gap: 60px;
  }

  .requirements-duo {
    grid-template-columns: 1fr 1fr;
  }

  .hero-wave {
    bottom: 40px;
  }
}

@media (max-width: 760px) {
  .app-stats {
    grid-template-columns: 1fr 1fr;
  }

  .stat-cell {
    padding: 28px 20px 32px;
    border-bottom: 1px solid rgba(248, 247, 241, .08);
  }

  .stat-cell:nth-child(2n) {
    border-right: 0;
  }

  .requirements-duo {
    grid-template-columns: 1fr;
  }

  .feature-track {
    grid-template-columns: 42px 1fr auto;
  }

  .track-dur {
    display: none;
  }

  .window-body {
    grid-template-columns: 92px 1fr;
  }

  .app-window {
    width: 100%;
    box-shadow: 14px 16px 0 rgba(0, 0, 0, .3);
  }

  .download-main {
    min-width: 100%;
  }

  .paper-section {
    padding: 100px 6vw 70px;
  }

  .paper-marquee {
    margin-top: 60px;
  }
}

@media (max-width: 600px) {
  .changelog-entry {
    padding-left: 36px;
  }

  .hero-wave {
    display: none;
  }

  .cursor-glow {
    display: none;
  }

  .features-head .head-side {
    align-items: flex-start;
    width: 100%;
  }
}

/* ---------- 减少动态效果 ---------- */

@media (prefers-reduced-motion: reduce) {
  .app-page .aurora-blob,
  .app-page .equalizer i,
  .app-page .mini-equalizer i,
  .app-page .app-badge i,
  .app-page .hero-wave i,
  .app-page .window-wave i,
  .app-page .mini-vinyl,
  .app-page .vinyl-disc,
  .app-page .req-icon,
  .app-page .gradient-text,
  .app-page .player-progress-fill,
  .app-page .outline-marquee-track,
  .app-page .paper-marquee span,
  .app-page .download-main::after,
  .app-page .hero-particles i,
  .app-page .app-title span,
  .app-page .head-eq i,
  .app-page .track-eq i,
  .app-page .soon-bar span,
  .app-page .latest-version,
  .app-page .requirement-main::before {
    animation: none;
  }

  .app-page .soon-bar span {
    width: 68%;
  }

  .app-page .app-title span {
    opacity: 1;
    transform: none;
    filter: none;
  }

  .download-main,
  .requirement-card,
  .app-toast,
  .faq-answer {
    transition: none;
  }
}