/* ============================================================
   seren.css — 東雪蓮 / AI 翻唱 专题页 v20
   仅在 body[data-page="seren"] 生效；类名统一 s* 前缀
   ============================================================ */

body[data-page="seren"] {
  --s-bg: #060a13;
  --s-bg2: #0a1220;
  --s-panel: rgba(14, 23, 40, .72);
  --s-line: rgba(148, 186, 226, .14);
  --s-line2: rgba(148, 186, 226, .26);
  --s-ink: #dbe7f5;
  --s-ink2: #a9bfd6;
  --s-mute: #7d93ac;
  --s-ice: #9fd8ff;
  --s-lav: #b9a8ff;
  --s-white: #f2f8ff;
  --s-mono: "Space Grotesk", ui-monospace, "SFMono-Regular", Consolas, monospace;
  background: var(--s-bg);
  color: var(--s-ink);
  -webkit-font-smoothing: antialiased;
}
body[data-page="seren"]::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(58% 46% at 10% 6%, rgba(96, 162, 255, .17), transparent 62%),
    radial-gradient(46% 40% at 92% 10%, rgba(150, 118, 255, .15), transparent 64%),
    radial-gradient(64% 50% at 50% 104%, rgba(62, 158, 190, .12), transparent 66%);
  transition: opacity .6s ease;
}
body[data-page="seren"]::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: .5;
  background-image: radial-gradient(rgba(190, 220, 255, .18) 1px, transparent 1px);
  background-size: 46px 46px;
  mask-image: radial-gradient(70% 60% at 50% 10%, #000 0%, transparent 78%);
}
body[data-page="seren"] .seren,
body[data-page="seren"] .head,
body[data-page="seren"] .foot,
body[data-page="seren"] .skip { position: relative; z-index: 1; }

/* ---------- header on dark ---------- */
body[data-page="seren"] .head {
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: background .3s ease, border-color .3s ease, backdrop-filter .3s ease;
}
body[data-page="seren"] .head .brand-name { color: var(--s-white); }
body[data-page="seren"] .head .brand-sub { color: var(--s-mute); }
body[data-page="seren"] .head .nav { background: rgba(12, 20, 34, .5); border: 1px solid var(--s-line); }
body[data-page="seren"] .head .nav a { color: var(--s-ink2); }
body[data-page="seren"] .head .nav a:hover { color: var(--s-white); }
body[data-page="seren"] .head .nav a.is-active:not(.nav-mail) { color: var(--s-white); }
body[data-page="seren"] .head .nav-mail { background: var(--s-white); color: #08111d; }
body[data-page="seren"] .head .theme { border-color: var(--s-line2); color: var(--s-ink2); }
body[data-page="seren"] .head.is-stuck {
  background: rgba(6, 10, 19, .78);
  border-bottom-color: var(--s-line);
  backdrop-filter: blur(16px) saturate(1.2);
}
body[data-page="seren"] .progress { background: linear-gradient(90deg, var(--s-ice), var(--s-lav)); }

/* ---------- footer on dark ---------- */
body[data-page="seren"] .foot {
  background: #04070f;
  border-top: 1px solid var(--s-line);
  color: var(--s-mute);
}
body[data-page="seren"] .foot-mark { color: var(--s-ink); }
body[data-page="seren"] .foot-links a,
body[data-page="seren"] .foot-meta a { color: var(--s-ink2); }
body[data-page="seren"] .foot-links a:hover,
body[data-page="seren"] .foot-meta a:hover { color: var(--s-white); }

/* global bgm player hidden on this page */
body[data-page="seren"] .player,
body[data-page="seren"] .player-note { display: none !important; }

.seren { position: relative; overflow: hidden; }
.seren .wrap { position: relative; }
.seren ::selection { background: rgba(159, 216, 255, .28); }
.seren a { color: var(--s-ice); }
.seren .sbtn-primary { color: #071120; }
.seren .sbtn-ghost { color: var(--s-ink); }

/* ---------- shared type ---------- */
.s-mono { font-family: var(--s-mono); letter-spacing: .14em; text-transform: uppercase; }
.s-kicker {
  display: inline-flex; align-items: center; gap: 9px;
  font-family: var(--s-mono); font-size: 11px; letter-spacing: .22em; text-transform: uppercase;
  color: var(--s-ice); border: 1px solid var(--s-line2); border-radius: 999px; padding: 7px 14px;
  background: rgba(12, 22, 38, .5);
}
.s-kicker .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--s-ice); box-shadow: 0 0 12px var(--s-ice); }
.s-sec-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 18px; margin-bottom: 26px; }
.s-sec-head h2 { font-size: clamp(26px, 3.2vw, 40px); letter-spacing: -.02em; color: var(--s-white); font-weight: 700; line-height: 1.1; }
.s-sec-head .no { font-family: var(--s-mono); font-size: 12px; color: var(--s-ice); letter-spacing: .2em; }
.s-sec-head .side { font-size: 12.5px; color: var(--s-mute); letter-spacing: .04em; text-align: right; }
.s-block { padding: clamp(64px, 8vw, 112px) 0; position: relative; }
.s-block + .s-block { border-top: 1px solid rgba(148, 186, 226, .08); }
.s-prose { color: var(--s-ink2); font-size: 15px; line-height: 1.95; }
.s-prose p + p { margin-top: 14px; }
.s-prose strong { color: var(--s-white); font-weight: 600; }

/* ---------- hero ---------- */
.shero { min-height: calc(100vh - 72px); display: flex; align-items: center; padding: clamp(40px, 6vh, 72px) 0 clamp(56px, 8vh, 96px); }
.shero-grid { display: grid; grid-template-columns: minmax(0, 1.12fr) minmax(320px, .88fr); gap: clamp(28px, 4vw, 64px); align-items: center; }
.shero h1 { margin: 22px 0 10px; line-height: .98; }
.shero h1 .cn {
  display: block; font-size: clamp(72px, 12vw, 156px); font-weight: 800; letter-spacing: -.045em;
  background: linear-gradient(176deg, #fff 12%, #cfe9ff 44%, #9fd8ff 74%, #8fb8e6 100%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
  filter: drop-shadow(0 18px 46px rgba(120, 190, 255, .22));
}
.shero h1 .en {
  display: block; margin-top: 16px; font-family: var(--s-mono); font-size: clamp(12px, 1.5vw, 16px);
  letter-spacing: .52em; color: var(--s-ink2); text-transform: uppercase;
}
.shero .lead { margin-top: 26px; max-width: 33em; color: var(--s-ink2); font-size: clamp(15px, 1.5vw, 17px); line-height: 1.95; }
.shero .lead em { color: var(--s-white); font-style: normal; }
.shero .hs { display: flex; flex-wrap: wrap; gap: 0; margin-top: 34px; border-top: 1px solid var(--s-line); border-bottom: 1px solid var(--s-line); }
.shero .hs li { flex: 1 1 0; min-width: 96px; padding: 16px 18px 15px; border-left: 1px solid var(--s-line); }
.shero .hs li:first-child { border-left: 0; padding-left: 0; }
.shero .hs b { display: block; font-family: var(--s-mono); font-size: clamp(20px, 2.4vw, 28px); color: var(--s-white); font-weight: 500; letter-spacing: .02em; }
.shero .hs span { display: block; margin-top: 5px; font-size: 11.5px; color: var(--s-mute); letter-spacing: .08em; }
.shero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 34px; }
.sbtn {
  display: inline-flex; align-items: center; gap: 10px; height: 48px; padding: 0 24px; border-radius: 999px;
  font-size: 14px; font-weight: 600; border: 1px solid transparent; cursor: pointer; transition: transform .2s, box-shadow .2s, background .2s, color .2s;
}
.sbtn svg { width: 17px; height: 17px; }
.sbtn-primary { background: linear-gradient(120deg, #cfeeff, #9fd8ff 46%, #b9a8ff); color: #071120; box-shadow: 0 14px 40px -18px rgba(140, 200, 255, .8); }
.sbtn-primary:hover { transform: translateY(-2px); box-shadow: 0 20px 52px -18px rgba(140, 200, 255, .9); }
.sbtn-ghost { border-color: var(--s-line2); color: var(--s-ink); background: rgba(12, 22, 38, .45); }
.sbtn-ghost:hover { border-color: var(--s-ice); color: var(--s-white); transform: translateY(-2px); }

/* medallion */
.smedal { position: relative; justify-self: center; width: min(400px, 88%); aspect-ratio: 1; }
.smedal .ring { position: absolute; inset: 0; border-radius: 50%; }
.smedal .ring.r1 {
  background: conic-gradient(from 0deg, transparent 0 62%, rgba(159, 216, 255, .9) 74%, transparent 86%);
  -webkit-mask: radial-gradient(circle, transparent 63%, #000 64%, #000 67%, transparent 68%);
  mask: radial-gradient(circle, transparent 63%, #000 64%, #000 67%, transparent 68%);
  animation: sspin 12s linear infinite;
}
.smedal .ring.r2 { inset: -18px; border: 1px solid rgba(159, 216, 255, .18); }
.smedal .ring.r3 { inset: -44px; border: 1px dashed rgba(185, 168, 255, .16); animation: sspin 46s linear infinite reverse; }
.smedal .glow { position: absolute; inset: 6%; border-radius: 50%; background: radial-gradient(circle at 50% 45%, rgba(120, 190, 255, .35), transparent 62%); filter: blur(28px); }
.smedal img {
  position: absolute; inset: 8%; width: 84%; height: 84%; border-radius: 50%; object-fit: cover;
  border: 1px solid rgba(200, 230, 255, .35); box-shadow: 0 26px 80px -30px rgba(90, 160, 255, .55), inset 0 0 40px rgba(10, 20, 40, .5);
  animation: sbreathe 7s ease-in-out infinite;
}
.smedal .tag {
  position: absolute; padding: 7px 13px; border-radius: 999px; font-family: var(--s-mono); font-size: 10.5px; letter-spacing: .12em;
  background: rgba(8, 14, 26, .78); border: 1px solid var(--s-line2); color: var(--s-ink2); white-space: nowrap;
  backdrop-filter: blur(8px);
}
.smedal .tag.t1 { top: 4%; right: -6%; }
.smedal .tag.t2 { bottom: 8%; left: -8%; }
.smedal .tag b { color: var(--s-ice); font-weight: 500; }
.smedal .orb { position: absolute; width: 7px; height: 7px; border-radius: 50%; background: var(--s-ice); box-shadow: 0 0 14px var(--s-ice); animation: sobit 9s linear infinite; }
.smedal .orb.o2 { background: var(--s-lav); box-shadow: 0 0 14px var(--s-lav); animation-duration: 13s; animation-delay: -3s; }
@keyframes sspin { to { transform: rotate(360deg); } }
@keyframes sbreathe { 0%, 100% { transform: scale(1); } 50% { transform: scale(1.012); } }
@keyframes sobit {
  0% { transform: rotate(0deg) translateX(52%) rotate(0deg); }
  100% { transform: rotate(360deg) translateX(52%) rotate(-360deg); }
}

/* in-page nav */
.snav { display: flex; flex-wrap: wrap; gap: 8px; padding: 0 0 6px; }
.snav a {
  display: inline-flex; align-items: center; gap: 8px; padding: 9px 16px; border-radius: 999px;
  border: 1px solid var(--s-line); color: var(--s-ink2); font-size: 12.5px; letter-spacing: .04em;
  background: rgba(10, 18, 32, .45); transition: .2s;
}
.snav a i { font-family: var(--s-mono); font-style: normal; font-size: 10px; color: var(--s-mute); }
.snav a:hover, .snav a.is-current { border-color: var(--s-line2); color: var(--s-white); background: rgba(120, 180, 255, .1); }

/* ---------- player ---------- */
.sp-player {
  position: relative; display: grid; grid-template-columns: 336px minmax(0, 1fr);
  scroll-margin-top: 84px;
  border: 1px solid var(--s-line); border-radius: 26px; overflow: hidden;
  background: linear-gradient(165deg, rgba(17, 28, 48, .92), rgba(7, 12, 22, .96));
  box-shadow: 0 40px 120px -60px rgba(0, 0, 0, .95), inset 0 1px 0 rgba(200, 230, 255, .06);
}
.sp-player::before {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background: radial-gradient(70% 50% at 82% 0%, rgba(120, 180, 255, .1), transparent 60%);
}
.sp-list { display: flex; flex-direction: column; border-right: 1px solid var(--s-line); position: relative; }
.sp-list-head {
  display: flex; align-items: center; justify-content: space-between; gap: 10px;
  padding: 18px 20px 14px; border-bottom: 1px solid var(--s-line);
}
.sp-list-head .t { font-size: 13px; color: var(--s-white); font-weight: 600; letter-spacing: .04em; }
.sp-list-head .c { font-family: var(--s-mono); font-size: 10.5px; color: var(--s-mute); letter-spacing: .1em; }
.sp-items { overflow-y: auto; max-height: 640px; padding: 8px 0 12px; scrollbar-width: thin; scrollbar-color: rgba(150, 190, 230, .3) transparent; }
.sp-items::-webkit-scrollbar { width: 6px; }
.sp-items::-webkit-scrollbar-thumb { background: rgba(150, 190, 230, .25); border-radius: 99px; }
.sitem {
  display: grid; grid-template-columns: 26px minmax(0, 1fr) auto; align-items: center; gap: 10px;
  width: 100%; padding: 10px 18px 10px 16px; border: 0; border-left: 2px solid transparent;
  background: transparent; color: var(--s-ink2); text-align: left; cursor: pointer; transition: background .18s, color .18s;
}
.sitem:hover { background: rgba(120, 180, 255, .07); color: var(--s-white); }
.sitem.is-on { background: linear-gradient(90deg, rgba(120, 190, 255, .16), rgba(120, 190, 255, 0)); border-left-color: var(--s-ice); color: var(--s-white); }
.sitem .i { font-family: var(--s-mono); font-size: 10.5px; color: var(--s-mute); }
.sitem .tt { min-width: 0; }
.sitem .tt b { display: block; font-size: 13.5px; font-weight: 600; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.sitem .tt span { display: block; margin-top: 2px; font-size: 11px; color: var(--s-mute); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.sitem .end { display: flex; align-items: center; gap: 8px; }
.sitem .d { font-family: var(--s-mono); font-size: 10.5px; color: var(--s-mute); }
.sitem .eq { display: none; gap: 2px; align-items: flex-end; height: 11px; }
.sitem .eq i { width: 2px; background: var(--s-ice); border-radius: 1px; animation: seq .9s ease-in-out infinite; }
.sitem .eq i:nth-child(2) { animation-delay: .18s; }
.sitem .eq i:nth-child(3) { animation-delay: .36s; }
.sitem.is-playing .eq { display: flex; }
.sitem.is-playing .d { display: none; }
@keyframes seq { 0%, 100% { height: 4px; } 50% { height: 10px; } }

.sp-stage { position: relative; padding: 26px 30px 24px; min-width: 0; }
.stage-top { position: relative; display: grid; grid-template-columns: 300px minmax(0, 1fr); gap: 28px; align-items: center; }
.cover-wrap { position: relative; aspect-ratio: 1; }
.cover-wrap .disc {
  position: absolute; z-index: 0; top: 6%; right: -12%; width: 88%; height: 88%; border-radius: 50%;
  background: repeating-radial-gradient(circle at 50% 50%, #0a1220 0 2px, #121d30 2px 3px);
  border: 1px solid rgba(160, 200, 240, .18); animation: sspin 18s linear infinite;
}
.cover-wrap .disc::after { content: ""; position: absolute; inset: 43%; border-radius: 50%; background: linear-gradient(140deg, #9fd8ff, #b9a8ff); opacity: .5; }
.cover-wrap img {
  position: relative; z-index: 1; width: 100%; height: 100%; object-fit: cover; border-radius: 18px;
  border: 1px solid rgba(200, 230, 255, .18); box-shadow: 0 30px 70px -30px rgba(0, 0, 0, .9);
  transition: transform .5s cubic-bezier(.2, .7, .2, 1);
}
.is-playing .cover-wrap img { transform: scale(1.012); }
.cover-wrap .frame { position: absolute; z-index: 2; inset: 10px; border: 1px solid rgba(255, 255, 255, .14); border-radius: 12px; pointer-events: none; }
.tmeta { min-width: 0; }
.tmeta .tags { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 12px; }
.tmeta .tg {
  font-family: var(--s-mono); font-size: 10px; letter-spacing: .1em; padding: 5px 9px; border-radius: 6px;
  border: 1px solid var(--s-line2); color: var(--s-ink2); background: rgba(10, 18, 32, .6);
}
.tmeta .tg.model { color: #071120; background: linear-gradient(120deg, #cfeeff, #9fd8ff); border-color: transparent; font-weight: 600; }
.tmeta h2 { font-size: clamp(26px, 3.4vw, 42px); line-height: 1.12; color: var(--s-white); letter-spacing: -.02em; word-break: break-word; }
.tmeta .sub { margin-top: 10px; font-size: 13px; color: var(--s-mute); line-height: 1.7; }
.tmeta .sub b { color: var(--s-ink2); font-weight: 500; }
.ver-switch { display: none; gap: 6px; margin-top: 16px; padding: 4px; border: 1px solid var(--s-line); border-radius: 999px; width: max-content; background: rgba(8, 14, 26, .6); }
.ver-switch.is-on { display: inline-flex; }
.ver-switch button {
  border: 0; background: transparent; color: var(--s-mute); font: inherit; font-size: 12px; padding: 6px 14px;
  border-radius: 999px; cursor: pointer; transition: .18s;
}
.ver-switch button:hover { color: var(--s-white); }
.ver-switch button.is-on { background: var(--s-white); color: #08111d; font-weight: 600; }
.tmeta .chips { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 16px; }
.tmeta .chip { font-size: 11px; color: var(--s-mute); border: 1px solid var(--s-line); padding: 5px 9px; border-radius: 6px; }
.tmeta .chip b { color: var(--s-ink); font-weight: 500; }

/* danmaku */
.danmaku { position: absolute; inset: 0; overflow: hidden; pointer-events: none; z-index: 5; border-radius: 18px; }
.danmaku span {
  position: absolute; left: 100%; white-space: nowrap; font-size: 14px; color: #eaf4ff;
  text-shadow: 0 1px 3px rgba(0, 0, 0, .7); will-change: transform; font-weight: 500;
}
.danmaku.is-off { display: none; }

/* waveform + controls */
.wave-wrap { position: relative; margin-top: 26px; }
.wave-wrap canvas { display: block; width: 100%; height: 72px; cursor: pointer; }
.wave-tip {
  position: absolute; top: -26px; transform: translateX(-50%); padding: 3px 8px; border-radius: 5px;
  background: rgba(8, 14, 26, .92); border: 1px solid var(--s-line2); font-family: var(--s-mono); font-size: 10.5px;
  color: var(--s-ice); pointer-events: none; opacity: 0; transition: opacity .15s; white-space: nowrap;
}
.wave-times { display: flex; justify-content: space-between; margin-top: 4px; font-family: var(--s-mono); font-size: 10.5px; color: var(--s-mute); letter-spacing: .06em; }
.sp-controls { display: flex; align-items: center; flex-wrap: wrap; gap: 10px; margin-top: 20px; padding-top: 18px; border-top: 1px solid var(--s-line); }
.cbtn {
  display: inline-flex; align-items: center; justify-content: center; width: 38px; height: 38px; border-radius: 50%;
  border: 1px solid var(--s-line2); background: rgba(10, 18, 32, .6); color: var(--s-ink2); cursor: pointer; transition: .18s;
}
.cbtn:hover { border-color: var(--s-ice); color: var(--s-white); }
.cbtn svg { width: 16px; height: 16px; }
.cbtn.is-on { border-color: var(--s-ice); color: var(--s-ice); background: rgba(120, 190, 255, .12); }
.bigplay {
  width: 56px; height: 56px; border-radius: 50%; border: 0; cursor: pointer;
  display: inline-flex; align-items: center; justify-content: center;
  background: linear-gradient(130deg, #e2f4ff, #9fd8ff 55%, #b9a8ff); color: #06101d;
  box-shadow: 0 16px 40px -16px rgba(140, 200, 255, .85); transition: transform .2s, box-shadow .2s;
}
.bigplay:hover { transform: scale(1.05); box-shadow: 0 20px 52px -16px rgba(140, 200, 255, .95); }
.bigplay { position: relative; }
.bigplay svg { position: absolute; inset: 0; margin: auto; width: 22px; height: 22px; transition: opacity .28s ease, transform .46s cubic-bezier(.34, 1.56, .64, 1), filter .3s ease; will-change: transform, opacity; }
.bigplay .i-play { opacity: 1; transform: scale(1) rotate(0deg); filter: blur(0); }
.bigplay .i-pause { opacity: 0; transform: scale(.42) rotate(-75deg); filter: blur(2px); }
.is-playing .bigplay .i-play { opacity: 0; transform: scale(.42) rotate(75deg); filter: blur(2px); }
.is-playing .bigplay .i-pause { opacity: 1; transform: scale(1) rotate(0deg); filter: blur(0); }
.bigplay::after {
  content: ""; position: absolute; inset: -5px; border-radius: 50%;
  border: 1px solid rgba(169, 201, 255, .45); opacity: 0; transform: scale(.9);
  transition: opacity .35s, transform .5s; pointer-events: none;
}
.is-playing .bigplay::after { opacity: 1; animation: bp-ring 2.8s ease-out infinite; }
@keyframes bp-ring {
  0% { transform: scale(.94); opacity: .55; }
  65% { transform: scale(1.22); opacity: 0; }
  100% { transform: scale(1.22); opacity: 0; }
}
.ctime { font-family: var(--s-mono); font-size: 11.5px; color: var(--s-mute); letter-spacing: .06em; padding: 0 2px; }
.ctime b { color: var(--s-ink2); font-weight: 500; }
.spacer { flex: 1 1 auto; }
.vol { display: flex; align-items: center; gap: 8px; }
.vol svg { width: 15px; height: 15px; color: var(--s-mute); }
.vol input {
  -webkit-appearance: none; appearance: none; width: 82px; height: 3px; border-radius: 99px;
  background: linear-gradient(90deg, var(--s-ice) var(--v, 70%), rgba(148, 186, 226, .22) var(--v, 70%)); cursor: pointer;
}
.vol input::-webkit-slider-thumb { -webkit-appearance: none; width: 11px; height: 11px; border-radius: 50%; background: #eaf6ff; box-shadow: 0 0 0 3px rgba(159, 216, 255, .2); }
.vol input::-moz-range-thumb { width: 11px; height: 11px; border: 0; border-radius: 50%; background: #eaf6ff; }
.speed { display: inline-flex; gap: 2px; padding: 3px; border: 1px solid var(--s-line); border-radius: 999px; }
.speed button {
  border: 0; background: transparent; color: var(--s-mute); font: inherit; font-size: 10.5px; font-family: var(--s-mono);
  padding: 4px 8px; border-radius: 999px; cursor: pointer;
}
.speed button.is-on { background: rgba(159, 216, 255, .16); color: var(--s-ice); }
.spectrum { display: block; width: 100%; height: 76px; margin-top: 16px; opacity: .8; }

/* ---------- track grid ---------- */
.stracks { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 14px; }
.stcard { border: 0; padding: 0; background: none; color: inherit; text-align: left; cursor: pointer; display: block; }
.stcard-img {
  position: relative; aspect-ratio: 1; border-radius: 14px; overflow: hidden;
  border: 1px solid var(--s-line); box-shadow: 0 20px 40px -30px rgba(0, 0, 0, .9);
}
.stcard-img img { width: 100%; height: 100%; object-fit: cover; transition: transform .5s cubic-bezier(.2, .7, .2, 1), filter .3s; }
.stcard:hover .stcard-img img { transform: scale(1.05); }
.stcard-img .badge {
  position: absolute; left: 8px; top: 8px; font-family: var(--s-mono); font-size: 9.5px; letter-spacing: .08em;
  padding: 4px 7px; border-radius: 5px; white-space: nowrap; background: rgba(6, 10, 19, .72); border: 1px solid var(--s-line2); color: var(--s-ice);
  backdrop-filter: blur(6px);
}
.stcard-img .play {
  position: absolute; right: 8px; bottom: 8px; width: 32px; height: 32px; border-radius: 50%;
  display: grid; place-items: center; background: rgba(240, 250, 255, .92); color: #071120; opacity: 0; transform: translateY(4px); transition: .22s;
}
.stcard-img .play svg { width: 13px; height: 13px; }
.stcard:hover .play, .stcard.is-on .play { opacity: 1; transform: none; }
.stcard.is-on .stcard-img { border-color: var(--s-ice); box-shadow: 0 0 0 1px var(--s-ice), 0 24px 50px -30px rgba(159, 216, 255, .8); }
.stcard-txt { padding: 10px 2px 0; }
.stcard-txt b { display: block; font-size: 13.5px; color: var(--s-white); font-weight: 600; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.stcard-txt span { display: block; margin-top: 3px; font-size: 11px; color: var(--s-mute); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

/* ---------- pipeline ---------- */
.spipe { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 14px; }
.pcard {
  position: relative; padding: 24px 22px 22px; border: 1px solid var(--s-line); border-radius: 18px;
  background: linear-gradient(170deg, rgba(16, 26, 44, .7), rgba(8, 13, 24, .6)); overflow: hidden;
}
.pcard::before {
  content: ""; position: absolute; inset: 0; opacity: 0; transition: opacity .3s;
  background: radial-gradient(60% 50% at 50% 0%, rgba(140, 200, 255, .14), transparent 70%);
}
.pcard:hover::before { opacity: 1; }
.pcard .pn { font-family: var(--s-mono); font-size: 11px; color: var(--s-ice); letter-spacing: .12em; }
.pcard h3 { margin-top: 14px; font-size: 18px; color: var(--s-white); }
.pcard p { margin-top: 9px; font-size: 12.5px; line-height: 1.8; color: var(--s-mute); }
.pcard .chips { display: flex; flex-wrap: wrap; gap: 5px; margin-top: 14px; }
.pcard .chips span { font-family: var(--s-mono); font-size: 9.5px; letter-spacing: .06em; color: var(--s-ink2); border: 1px solid var(--s-line); padding: 3px 6px; border-radius: 4px; }

/* ---------- models ---------- */
.smodels { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; }
.mcard { padding: 26px 24px; border: 1px solid var(--s-line); border-radius: 20px; background: rgba(10, 18, 32, .5); position: relative; overflow: hidden; }
.mcard .big {
  font-family: var(--s-mono); font-size: clamp(44px, 6vw, 64px); line-height: 1; letter-spacing: -.02em;
  background: linear-gradient(150deg, #fff, #9fd8ff 60%, #b9a8ff); -webkit-background-clip: text; background-clip: text; color: transparent;
}
.mcard h3 { margin-top: 12px; font-size: 16px; color: var(--s-white); }
.mcard .desc { margin-top: 10px; font-size: 12.5px; line-height: 1.85; color: var(--s-mute); }
.mcard dl { margin-top: 16px; padding-top: 14px; border-top: 1px solid var(--s-line); display: grid; gap: 8px; }
.mcard dl div { display: flex; justify-content: space-between; gap: 12px; font-size: 11.5px; }
.mcard dt { color: var(--s-mute); }
.mcard dd { color: var(--s-ink2); text-align: right; }

/* ---------- metrics table ---------- */
.mtable { border: 1px solid var(--s-line); border-radius: 16px; overflow: hidden; }
.mtable table { width: 100%; border-collapse: collapse; font-size: 12.5px; }
.mtable th, .mtable td { padding: 13px 16px; text-align: left; border-bottom: 1px solid var(--s-line); }
.mtable th { font-family: var(--s-mono); font-size: 10px; letter-spacing: .1em; color: var(--s-mute); font-weight: 400; text-transform: uppercase; }
.mtable td { color: var(--s-ink2); }
.mtable tr:last-child td { border-bottom: 0; }
.mtable td.num { font-family: var(--s-mono); color: var(--s-white); letter-spacing: .02em; }
.snote { margin-top: 14px; font-size: 12px; color: var(--s-mute); line-height: 1.8; }

/* ---------- credits ---------- */
.scredits { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(0, .75fr); gap: 36px; align-items: start; }
.scredits .clist { display: grid; gap: 0; border-top: 1px solid var(--s-line); }
.scredits .clist div { display: grid; grid-template-columns: 96px minmax(0, 1fr); gap: 16px; padding: 14px 0; border-bottom: 1px solid var(--s-line); font-size: 13px; line-height: 1.8; }
.scredits dt { color: var(--s-mute); font-size: 11.5px; letter-spacing: .06em; }
.scredits dd { color: var(--s-ink2); }
.scredits dd b { color: var(--s-white); font-weight: 600; }
.slinks { display: grid; gap: 8px; }
.slinks a {
  display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 14px 16px;
  border: 1px solid var(--s-line); border-radius: 12px; color: var(--s-ink2); font-size: 13px; transition: .2s;
}
.slinks a:hover { border-color: var(--s-ice); color: var(--s-white); transform: translateY(-1px); }
.slinks a span { font-family: var(--s-mono); font-size: 10px; color: var(--s-mute); letter-spacing: .08em; }

.egg { margin-top: 26px; display: flex; align-items: center; gap: 14px; color: var(--s-mute); font-size: 12px; }
.egg button {
  width: 44px; height: 44px; border-radius: 50%; border: 1px solid var(--s-line2); background: rgba(10, 18, 32, .6);
  color: var(--s-ice); display: grid; place-items: center; cursor: pointer; transition: transform .3s, box-shadow .3s;
}
.egg button:hover { transform: rotate(12deg) scale(1.06); box-shadow: 0 0 26px rgba(159, 216, 255, .35); }
.egg svg { width: 22px; height: 22px; }

/* aurora easter egg */
body.is-aurora[data-page="seren"]::before {
  opacity: 1;
  background:
    radial-gradient(60% 50% at 20% 10%, rgba(120, 255, 220, .22), transparent 60%),
    radial-gradient(50% 45% at 80% 12%, rgba(180, 120, 255, .24), transparent 62%),
    radial-gradient(70% 55% at 50% 100%, rgba(80, 200, 255, .2), transparent 66%);
}
body.is-aurora .smedal img { animation-duration: 3.4s; }
body.is-aurora .smedal .ring.r1 { animation-duration: 6s; }

/* ---------- shortcuts sheet ---------- */
.skbd {
  position: fixed; inset: 0; z-index: 80; display: grid; place-items: center; padding: 20px;
  background: rgba(3, 6, 12, .72); backdrop-filter: blur(10px); opacity: 0; visibility: hidden; transition: .25s;
}
.skbd.open { opacity: 1; visibility: visible; }
.skbd-card {
  width: min(520px, 100%); border: 1px solid var(--s-line2); border-radius: 20px; padding: 26px 26px 22px;
  background: linear-gradient(170deg, #101a2c, #070c16); box-shadow: 0 50px 120px -40px #000;
}
.skbd-card h3 { font-size: 17px; color: var(--s-white); display: flex; justify-content: space-between; align-items: center; }
.skbd-card h3 button { border: 0; background: none; color: var(--s-mute); font-size: 20px; cursor: pointer; line-height: 1; }
.skbd-list { display: grid; grid-template-columns: 1fr 1fr; gap: 10px 22px; margin-top: 18px; }
.skbd-list div { display: flex; align-items: center; justify-content: space-between; gap: 12px; font-size: 12.5px; color: var(--s-ink2); padding-bottom: 9px; border-bottom: 1px solid var(--s-line); }
.skbd-list kbd {
  font-family: var(--s-mono); font-size: 10.5px; color: var(--s-white); border: 1px solid var(--s-line2);
  border-bottom-width: 2px; border-radius: 5px; padding: 2px 7px; background: rgba(10, 18, 32, .8);
}

/* ---------- petals canvas ---------- */
.spetals { position: absolute; inset: 0; z-index: 0; pointer-events: none; }
.seren > * { position: relative; z-index: 1; }

/* ---------- responsive ---------- */
@media (max-width: 1180px) {
  .sp-player { grid-template-columns: 300px minmax(0, 1fr); }
  .stage-top { grid-template-columns: 240px minmax(0, 1fr); gap: 22px; }
  .stracks { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .spipe { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 960px) {
  .shero-grid { grid-template-columns: 1fr; gap: 34px; }
  .smedal { width: min(320px, 72%); order: -1; }
  .shero { min-height: 0; padding-top: 24px; }
  .sp-player { grid-template-columns: 1fr; }
  .sp-list { border-right: 0; border-bottom: 1px solid var(--s-line); }
  .sp-items { max-height: 236px; display: grid; grid-template-columns: 1fr 1fr; gap: 0 8px; padding: 6px 8px 10px; }
  .sitem { padding: 9px 10px; }
  .sp-stage { padding: 22px; }
  .smodel, .smodels { grid-template-columns: 1fr; }
  .scredits { grid-template-columns: 1fr; gap: 22px; }
}
@media (max-width: 760px) {
  .shero h1 .cn { font-size: clamp(56px, 18vw, 88px); }
  .shero .hs li { min-width: 50%; padding: 14px 14px 13px; }
  .shero .hs li:nth-child(3) { border-left: 0; padding-left: 0; }
  .shero .hs li:nth-child(-n+2) { border-bottom: 1px solid var(--s-line); }
  .stage-top { grid-template-columns: 1fr; gap: 18px; }
  .cover-wrap { width: min(260px, 78%); margin: 0 auto; }
  .cover-wrap .disc { right: -8%; }
  .tmeta { text-align: left; }
  .sp-items { grid-template-columns: 1fr; max-height: 300px; }
  .stracks { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .spipe { grid-template-columns: 1fr; }
  .s-sec-head { flex-direction: column; align-items: flex-start; gap: 6px; }
  .s-sec-head .side { text-align: left; }
  .sp-controls { gap: 8px; }
  .spacer { display: none; }
  .vol { order: 3; }
  .ctime { font-size: 10.5px; }
  .skbd-list { grid-template-columns: 1fr; }
  .mtable th, .mtable td { padding: 10px 11px; font-size: 11.5px; }
  .mtable th:first-child, .mtable td:first-child { max-width: 130px; }
}
@media (max-width: 420px) {
  .stracks { grid-template-columns: 1fr; }
  .shero .hs li { min-width: 100%; border-left: 0; padding-left: 0; }
}

/* ---------- motion prefs ---------- */
@media (prefers-reduced-motion: reduce) {
  .smedal .ring, .smedal img, .smedal .orb, .cover-wrap .disc, .sitem .eq i { animation: none !important; }
}

/* ---------- lyrics (v22) ---------- */
.sp-lyric {
  display: none; margin-top: 22px; padding: 14px 20px 15px;
  border-left: 2px solid var(--s-ice); border-radius: 0 12px 12px 0;
  background: linear-gradient(90deg, rgba(120, 190, 255, .085), rgba(120, 190, 255, .015) 70%, transparent);
}
.sp-lyric.is-on { display: block; }
.sp-lyric .lcur {
  font-size: clamp(17px, 2.1vw, 24px); line-height: 1.62; color: var(--s-white);
  font-weight: 600; letter-spacing: .01em; white-space: pre-line;
  text-shadow: 0 0 26px rgba(159, 216, 255, .22);
}
.sp-lyric .ltr {
  margin-top: 5px; font-size: 12.5px; line-height: 1.75; color: var(--s-ink2);
  white-space: pre-line; opacity: .85;
}
.sp-lyric .ltr:empty, .sp-lyric .lnext:empty { display: none; }
.sp-lyric .lnext {
  margin-top: 9px; font-size: 11.5px; color: var(--s-mute); opacity: .55;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
@keyframes lswap { 0% { opacity: 0; transform: translateY(5px); } 100% { opacity: 1; transform: none; } }
.sp-lyric .lcur.is-swap { animation: lswap .42s cubic-bezier(.2, .7, .2, 1); }

/* stronger aurora easter egg */
body.is-aurora[data-page="seren"] .sp-player {
  border-color: rgba(160, 225, 255, .36);
  box-shadow: 0 40px 110px -55px rgba(0, 0, 0, .95), 0 0 80px -20px rgba(120, 255, 220, .35), inset 0 0 60px rgba(160, 120, 255, .1);
}
body.is-aurora[data-page="seren"] .shero h1 .cn {
  text-shadow: 0 0 40px rgba(160, 255, 230, .35), 0 0 90px rgba(170, 140, 255, .3);
}
body.is-aurora[data-page="seren"] #spetals { filter: hue-rotate(35deg) saturate(1.35); }
body.is-aurora[data-page="seren"] .egg button {
  border-color: rgba(180, 255, 235, .6); color: #d9fff6;
  box-shadow: 0 0 30px rgba(160, 255, 225, .55), inset 0 0 18px rgba(160, 255, 225, .25);
}
body.is-aurora[data-page="seren"] .snav a.is-current { border-color: rgba(160, 255, 225, .45); }

@media (max-width: 760px) {
  .sp-lyric { margin-top: 16px; padding: 12px 14px 13px; }
  .sp-lyric .lcur { font-size: 16px; line-height: 1.6; }
  .sp-lyric .ltr { font-size: 11.5px; }
  .sp-lyric .lnext { font-size: 10.5px; margin-top: 7px; }
}


/* ---------- v23 原曲对照 ---------- */
.s-lede {
  max-width: 780px;
  margin: -6px 0 24px;
  color: var(--s-mute);
  font-size: 13.5px;
  line-height: 1.95;
}
.s-lede b { color: var(--s-ink2); font-weight: 500; }
.sp-mode {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 14px;
}
.sp-mode button {
  appearance: none;
  border: 1px solid var(--s-line);
  background: transparent;
  color: var(--s-mute);
  font: inherit;
  font-size: 12px;
  line-height: 1;
  padding: 7px 15px;
  border-radius: 999px;
  cursor: pointer;
  transition: color .25s, border-color .25s, background .25s, transform .25s;
}
.sp-mode button:hover { color: var(--s-white); border-color: var(--s-line2); }
.sp-mode button.is-on {
  color: #071120;
  font-weight: 600;
  border-color: transparent;
  background: linear-gradient(120deg, #cfeeff, #a9c9ff);
  box-shadow: 0 8px 22px -12px rgba(159, 216, 255, .9);
}
.sp-mode .mode-note {
  font-size: 11px;
  color: var(--s-mute);
  margin-left: 4px;
  letter-spacing: .02em;
}
.cmp-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}
.cmp-card {
  border: 1px solid var(--s-line);
  background: var(--s-panel);
  border-radius: 14px;
  overflow: hidden;
  cursor: pointer;
  transition: transform .35s cubic-bezier(.2, .7, .2, 1), border-color .3s, box-shadow .3s;
}
.cmp-card:hover {
  transform: translateY(-3px);
  border-color: var(--s-line2);
  box-shadow: 0 26px 48px -34px rgba(0, 0, 0, .9);
}
.cmp-cover { position: relative; aspect-ratio: 1; overflow: hidden; background: #0b1322; }
.cmp-cover img { width: 100%; height: 100%; object-fit: cover; display: block; transition: transform .5s; }
.cmp-card:hover .cmp-cover img { transform: scale(1.04); }
.cmp-model {
  position: absolute;
  top: 10px;
  left: 10px;
  font-family: var(--s-mono);
  font-size: 10px;
  letter-spacing: .08em;
  color: #071120;
  background: rgba(207, 238, 255, .92);
  border-radius: 5px;
  padding: 3px 7px;
}
.cmp-body { padding: 14px 15px 15px; }
.cmp-body h3 {
  margin: 0;
  color: var(--s-white);
  font-size: 15px;
  line-height: 1.4;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.cmp-body p {
  margin: 5px 0 0;
  color: var(--s-mute);
  font-size: 11.5px;
  line-height: 1.65;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.cmp-actions { display: flex; gap: 8px; margin-top: 12px; }
.cmp-actions button {
  flex: 1;
  appearance: none;
  border: 1px solid var(--s-line);
  background: transparent;
  color: var(--s-ink2);
  font: inherit;
  font-size: 12px;
  padding: 8px 6px;
  border-radius: 8px;
  cursor: pointer;
  transition: color .25s, border-color .25s, background .25s;
}
.cmp-actions button:first-child {
  color: var(--s-ice);
  border-color: rgba(159, 216, 255, .38);
  background: rgba(159, 216, 255, .07);
}
.cmp-actions button:hover { color: var(--s-white); border-color: var(--s-line2); background: rgba(120, 180, 255, .12); }
.snote b { color: var(--s-ink2); font-weight: 500; }

@media (max-width: 960px) {
  .cmp-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 760px) {
  .s-lede { font-size: 12.5px; line-height: 1.85; margin-bottom: 20px; }
  .sp-mode { margin-top: 12px; }
  .sp-mode .mode-note { width: 100%; margin-left: 0; }
  .cmp-grid { gap: 10px; }
  .cmp-body { padding: 12px 12px 13px; }
  .cmp-body h3 { font-size: 13.5px; }
  .cmp-actions { gap: 6px; margin-top: 10px; }
  .cmp-actions button { font-size: 11.5px; padding: 7px 4px; }
}
@media (max-width: 520px) {
  .cmp-grid { grid-template-columns: 1fr; }
  .cmp-cover { aspect-ratio: 16 / 9; }
}

/* ---------- v24 compare art + loading ---------- */
.cmp-cover .cmp-art {
  position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover;
  transition: opacity .55s ease, transform .9s cubic-bezier(.2, .7, .2, 1), filter .5s;
}
.cmp-cover .art-cover { opacity: 1; transform: scale(1); }
.cmp-cover .art-orig { opacity: 0; transform: scale(1.04); }
.cmp-card.show-orig .art-cover { opacity: 0; transform: scale(1.02); }
.cmp-card.show-orig .art-orig { opacity: 1; transform: scale(1); }
.cmp-card.is-current { border-color: rgba(169, 201, 255, .52); box-shadow: 0 30px 62px -40px rgba(120, 180, 255, .75); }
.cmp-state {
  position: absolute; top: 10px; right: 10px; z-index: 2;
  font-family: var(--s-mono); font-size: 10px; letter-spacing: .1em;
  color: #f3f8ff; background: rgba(8, 15, 28, .68); border: 1px solid rgba(200, 225, 255, .28);
  backdrop-filter: blur(8px); border-radius: 5px; padding: 3px 7px;
}
.cmp-state .st-cover { display: inline; }
.cmp-state .st-orig { display: none; }
.cmp-card.show-orig .cmp-state .st-cover { display: none; }
.cmp-card.show-orig .cmp-state .st-orig { display: inline; }
.cmp-loading {
  position: absolute; left: 50%; bottom: 14px; z-index: 3; transform: translate(-50%, 8px);
  display: inline-flex; align-items: center; gap: 7px; opacity: 0; pointer-events: none;
  color: #eaf5ff; background: rgba(6, 12, 24, .82); border: 1px solid rgba(169, 201, 255, .28);
  border-radius: 99px; padding: 5px 10px; font-size: 10.5px; letter-spacing: .06em;
  transition: opacity .25s, transform .25s; backdrop-filter: blur(8px);
}
.cmp-card.is-busy .cmp-loading { opacity: 1; transform: translate(-50%, 0); }
.cmp-loading i {
  width: 10px; height: 10px; border-radius: 50%; border: 1.5px solid rgba(169, 201, 255, .35);
  border-top-color: #cfeeff; animation: cmp-spin .8s linear infinite;
}
@keyframes cmp-spin { to { transform: rotate(360deg); } }
.cmp-actions button.is-active {
  color: #06101d; border-color: transparent;
  background: linear-gradient(120deg, #cfeeff, #a9c9ff);
  box-shadow: 0 8px 18px -12px rgba(159, 216, 255, .9);
}
.cmp-actions button.is-active:hover { color: #06101d; border-color: transparent; background: linear-gradient(120deg, #e2f4ff, #b9d8ff); }
@media (max-width: 520px) {
  .cmp-state { top: 8px; right: 8px; font-size: 9px; }
  .cmp-loading { bottom: 10px; font-size: 10px; padding: 4px 9px; }
}

/* v25: compare click returns to player with loading notice */
.sp-player.is-loading .sp-stage::after {
  content: attr(data-load-text);
  position: absolute; left: 50%; top: 50%; transform: translate(-50%, -50%);
  z-index: 40; pointer-events: none; white-space: nowrap;
  padding: 9px 16px; border-radius: 99px;
  color: #eaf6ff; font-size: 12.5px; letter-spacing: .1em;
  background: rgba(6, 13, 26, .94);
  border: 1px solid rgba(169, 201, 255, .42);
  box-shadow: 0 16px 38px -20px rgba(120, 180, 255, .9), 0 0 0 1px rgba(255, 255, 255, .04) inset;
  backdrop-filter: blur(10px);
  animation: load-pulse 1.3s ease-in-out infinite;
}
@keyframes load-pulse {
  0%, 100% { opacity: .65; }
  50% { opacity: 1; }
}
@media (max-width: 520px) {
  .sp-player.is-loading .sp-stage::after { padding: 8px 13px; font-size: 11.5px; }
}