:root{color-scheme:dark;--bg:#050b12;--panel:#0b1520;--line:rgba(255,255,255,.12);--text:#f3f8fc;--muted:#9eafbf;--blue:#42b9ff;--cyan:#72f2ff;--green:#63e6a6}
*{box-sizing:border-box}
html{background:var(--bg);scroll-behavior:smooth}
body{margin:0;min-width:320px;background:radial-gradient(circle at 50% -10%,#173149 0,transparent 38rem),var(--bg);color:var(--text);font:16px/1.45 Inter,ui-sans-serif,system-ui,-apple-system,"Segoe UI",sans-serif}
button,input,select{font:inherit}
a{color:inherit;text-decoration:none}
.karaoke-header{position:sticky;top:0;z-index:20;display:grid;grid-template-columns:1fr auto 1fr;align-items:center;min-height:68px;padding:0 clamp(18px,4vw,52px);border-bottom:1px solid var(--line);background:rgba(5,11,18,.82);backdrop-filter:blur(18px)}
.brand{font-size:clamp(15px,2vw,20px);font-weight:900;letter-spacing:.09em}.mode{padding:7px 12px;border:1px solid rgba(114,242,255,.3);border-radius:99px;color:var(--cyan);font-size:12px;font-weight:800;letter-spacing:.16em}.back{justify-self:end;color:var(--muted);font-weight:700}.back:hover{color:var(--text)}
main{width:min(1180px,calc(100% - 32px));margin:0 auto;padding:clamp(34px,7vw,82px) 0 80px}
.intro{text-align:center;margin:0 auto clamp(26px,4vw,46px)}.intro p,.song-list>div>p{margin:0 0 8px;color:var(--cyan);font-size:12px;font-weight:900;letter-spacing:.18em}.intro h1{margin:0;font-size:clamp(36px,6vw,74px);line-height:1;letter-spacing:-.05em}.intro span{display:block;margin-top:16px;color:var(--muted)}
.karaoke-card{overflow:hidden;border:1px solid var(--line);border-radius:28px;background:rgba(11,21,32,.9);box-shadow:0 32px 100px rgba(0,0,0,.46)}
.stage{position:relative;display:grid;place-items:center;min-height:clamp(360px,54vw,650px);overflow:hidden;background:#06101a;isolation:isolate}
.stage video{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;z-index:-3;filter:saturate(.88)}
.stage-shade{position:absolute;inset:0;z-index:-2;background:linear-gradient(180deg,rgba(3,8,14,.18),rgba(3,8,14,.48) 55%,rgba(3,8,14,.86)),radial-gradient(circle at center,transparent 10%,rgba(1,5,9,.42) 100%)}
.visualizer{position:absolute;inset:auto 5% 4%;height:78px;display:flex;align-items:flex-end;justify-content:center;gap:clamp(3px,.5vw,8px);opacity:.2;z-index:-1}.visualizer i{width:clamp(4px,.7vw,9px);min-height:7px;border-radius:9px;background:linear-gradient(var(--cyan),var(--blue));transform-origin:bottom;transition:height .28s ease}
.lyrics{width:min(980px,92%);padding:34px 16px;text-align:center;text-wrap:balance;text-shadow:0 3px 20px #000,0 1px 4px #000}.lyrics p{margin:16px 0}.lyrics .previous,.lyrics .next{min-height:1.5em;color:rgba(238,247,253,.55);font-size:clamp(17px,2.2vw,28px);font-weight:650}.lyrics .current{min-height:2.3em;color:#fff;font-size:clamp(29px,4.7vw,58px);font-weight:900;line-height:1.17;letter-spacing:-.025em}.lyrics .current span{color:rgba(255,255,255,.62);transition:color .1s,text-shadow .1s}.lyrics .current span.sung{color:var(--cyan);text-shadow:0 0 24px rgba(66,185,255,.75)}
.panel{padding:clamp(18px,3vw,32px)}.track-meta{display:flex;align-items:center;gap:16px}.track-meta img{width:76px;height:76px;border-radius:16px;object-fit:cover;box-shadow:0 8px 24px rgba(0,0,0,.35)}.track-meta span{color:var(--muted);font-size:14px}.track-meta h2{margin:2px 0 0;font-size:clamp(24px,3vw,34px)}
.transport{display:flex;align-items:center;gap:18px;margin:26px 0}.play{flex:0 0 58px;width:58px;height:58px;border:0;border-radius:50%;background:linear-gradient(135deg,var(--cyan),var(--blue));color:#03101a;cursor:pointer;font-weight:900;box-shadow:0 8px 26px rgba(66,185,255,.28)}.play:hover{transform:translateY(-1px)}.play span{display:block;margin-left:3px}.play.playing span{margin-left:0}
.play:disabled{cursor:wait;opacity:.5;transform:none;box-shadow:none}
.timeline{flex:1}.timeline input{width:100%;accent-color:var(--cyan);cursor:pointer}.timeline div{display:flex;justify-content:space-between;color:var(--muted);font-size:12px;font-variant-numeric:tabular-nums}
.options{display:grid;grid-template-columns:1fr 1fr auto;gap:12px}.option,.tempo{min-height:66px;display:flex;align-items:center;justify-content:space-between;gap:18px;padding:13px 16px;border:1px solid var(--line);border-radius:16px;background:rgba(255,255,255,.035);color:var(--text)}.option span{display:flex;flex-direction:column;text-align:left}.option small{color:var(--muted);font-size:12px}.option input{position:absolute;opacity:0;pointer-events:none}.option>i{position:relative;width:42px;height:24px;flex:none;border-radius:99px;background:#344352}.option>i:after{content:"";position:absolute;left:3px;top:3px;width:18px;height:18px;border-radius:50%;background:#fff;transition:transform .2s}.option input:checked+i{background:var(--blue)}.option input:checked+i:after{transform:translateX(18px)}button.option{cursor:pointer}.mic>i{display:grid;place-items:center;background:transparent;color:#5b6875;font-size:20px}.mic.active>i{color:var(--green);text-shadow:0 0 12px var(--green)}.tempo{flex-direction:column;align-items:flex-start;gap:5px;color:var(--muted);font-size:12px}.tempo select{min-width:128px;border:0;background:#142332;color:var(--text);border-radius:9px;padding:7px 9px}.privacy{margin:14px 2px 0;color:#728494;font-size:12px}
.song-list{margin-top:clamp(54px,8vw,90px)}.song-list h2{margin:0 0 22px;font-size:clamp(28px,4vw,44px)}.song{width:100%;display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:16px;padding:14px;border:1px solid rgba(114,242,255,.24);border-radius:18px;background:linear-gradient(120deg,rgba(66,185,255,.12),rgba(255,255,255,.025));color:var(--text);text-align:left}.song img{border-radius:12px;object-fit:cover}.song span{display:flex;flex-direction:column}.song b{font-size:18px}.song small,.more{color:var(--muted)}.song i{padding:7px 10px;border-radius:99px;background:rgba(99,230,166,.12);color:var(--green);font-size:12px;font-style:normal}.more{text-align:center;margin:18px 0 0;font-size:13px}
@media(max-width:720px){.karaoke-header{min-height:58px}.mode{font-size:10px}.back{font-size:13px}main{width:min(100% - 20px,1180px);padding-top:28px}.intro h1{font-size:39px}.karaoke-card{border-radius:20px}.stage{min-height:58vh;max-height:630px}.lyrics{width:96%;padding-inline:6px}.lyrics .current{font-size:clamp(27px,8.2vw,42px)}.panel{padding:16px}.track-meta img{width:62px;height:62px}.transport{margin:20px 0}.options{grid-template-columns:1fr}.tempo{flex-direction:row;align-items:center}.privacy{text-align:center}.song i{display:none}}
@media(max-width:410px){.karaoke-header{grid-template-columns:1fr auto}.mode{display:none}.stage{min-height:52vh}.lyrics .previous,.lyrics .next{font-size:16px}.song{grid-template-columns:auto 1fr}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}.visualizer i{transition:none}}