/* RESONANCE · 共振 — introduction. One resonant plate behind everything; the page is
   ink and gold on #141414, like the game. */
@font-face{font-family:"RSerif";src:url("/stellar/resonance/fonts/serif.woff2") format("woff2"),url("/stellar/resonance/fonts/serif.ttf") format("truetype");font-display:swap}
@font-face{font-family:"RThin";src:url("/stellar/resonance/fonts/thin.woff2") format("woff2"),url("/stellar/resonance/fonts/thin.ttf") format("truetype");font-display:swap}
:root{--bg:#141414;--ink:#f2f2f2;--grey:#c5c9cd;--dim:#8e9296;--line:#2c2c2c;--line2:#3a3a3a;--gold:#ffc94d;--gold2:#ffdd8a;--ease:cubic-bezier(.16,1,.3,1);--spring:cubic-bezier(.34,1.56,.64,1);--serif:"RSerif","Noto Serif SC","Songti SC","STSong",serif;--sans:"PingFang SC","Microsoft YaHei UI","Microsoft YaHei","Noto Sans SC",system-ui,sans-serif;--thin:"RThin","Segoe UI Light","Helvetica Neue",sans-serif}
*{box-sizing:border-box;margin:0;padding:0}
html{background:var(--bg)}
html.lenis,html.lenis body{height:auto}
.lenis.lenis-smooth{scroll-behavior:auto!important}
body{background:transparent;color:var(--ink);font-family:var(--sans);-webkit-font-smoothing:antialiased;overflow-x:hidden;line-height:1.6}
html[data-lang="zh"] .en,html[data-lang="en"] .zh{display:none!important}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0}
::selection{background:var(--gold);color:#141414}
.mono{font-family:ui-monospace,"Cascadia Mono",Consolas,monospace;font-variant-numeric:tabular-nums}

/* ---------- the plate ---------- */
#field{position:fixed;inset:0;width:100vw;height:100vh;display:block;z-index:0;background:var(--bg)}
.no-gl #field{display:none}
.no-gl body{background:radial-gradient(ellipse at 50% 40%,#2a2414 0%,#141414 60%)}
.grain{position:fixed;inset:-50%;z-index:1;pointer-events:none;opacity:.07;background-image:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='160' height='160'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2' stitchTiles='stitch'/></filter><rect width='100%' height='100%' filter='url(%23n)'/></svg>");animation:grain 1.2s steps(6) infinite}
@keyframes grain{0%{transform:translate(0,0)}20%{transform:translate(-3%,2%)}40%{transform:translate(2%,-3%)}60%{transform:translate(-2%,-2%)}80%{transform:translate(3%,1%)}100%{transform:translate(0,0)}}
.vignette{position:fixed;inset:0;z-index:1;pointer-events:none;background:radial-gradient(ellipse at 50% 50%,transparent 45%,#0b0b0bcc 100%)}
main,footer,.nav{position:relative;z-index:2}

/* ---------- preloader ---------- */
#pre{position:fixed;inset:0;z-index:100;display:grid;place-items:center;background:var(--bg);transition:opacity 1s var(--ease),visibility 1s}
#pre.done{opacity:0;visibility:hidden}
#pre svg{width:180px;height:180px;overflow:visible}
#pre .num{position:absolute;font-family:var(--thin);font-size:15px;letter-spacing:.5em;color:var(--grey);margin-top:250px}

/* ---------- cursor ---------- */
.has-cursor,.has-cursor *{cursor:none!important}
#cursor{position:fixed;left:0;top:0;z-index:999;pointer-events:none}
#cursor i{position:absolute;left:-16px;top:-16px;width:32px;height:32px;border:1.4px solid transparent;border-radius:50%;border-color:var(--ink) transparent var(--ink) transparent;animation:spin 2.6s linear infinite;transition:width .4s var(--ease),height .4s var(--ease),left .4s var(--ease),top .4s var(--ease),border-radius .4s var(--ease),border-color .3s}
#cursor b{position:absolute;left:-2.5px;top:-2.5px;width:5px;height:5px;border-radius:50%;background:var(--gold);transition:transform .15s}
#cursor.hot i{animation:none;border-radius:5px;border-color:var(--gold);left:-24px;top:-24px;width:48px;height:48px}
#cursor.beat b{transform:scale(2.4)}
@keyframes spin{to{transform:rotate(360deg)}}

/* ---------- nav ---------- */
.nav{position:fixed;inset:0 0 auto 0;z-index:60;display:flex;align-items:center;justify-content:space-between;gap:16px;padding:20px 32px;transition:transform .7s var(--ease),background .5s}
.nav.hide{transform:translateY(-110%)}
.nav.solid{background:#141414d9;backdrop-filter:blur(14px) saturate(1.2);-webkit-backdrop-filter:blur(14px) saturate(1.2);box-shadow:0 1px 0 var(--line)}
.nav .back{color:var(--grey);font-size:13px;letter-spacing:.1em;transition:color .3s}.nav .back:hover{color:var(--ink)}
.brand{display:flex;align-items:center;gap:12px;font-family:var(--sans)}
.brand span{display:flex;align-items:baseline;gap:10px}.brand b{font-size:17px;font-weight:500;letter-spacing:.2em}.brand small{font-size:10px;letter-spacing:.32em;color:var(--grey)}
.brand svg{width:22px;height:22px}
.nav-r{display:flex;align-items:center;gap:10px}
.pill{white-space:nowrap;position:relative;overflow:hidden;isolation:isolate;border:1px solid var(--line2);border-radius:999px;padding:8px 16px;font-size:13px;letter-spacing:.08em;color:var(--grey);transition:color .4s var(--ease),border-color .4s}
.pill::before{content:"";position:absolute;z-index:-1;inset:0;background:var(--ink);transform:scaleY(0);transform-origin:bottom;transition:transform .5s var(--ease)}
.pill:hover{color:#141414;border-color:var(--ink)}.pill:hover::before{transform:scaleY(1)}
.pill[aria-pressed="true"]{color:var(--gold);border-color:var(--gold)}
.pill.play{color:#141414;background:var(--gold);border-color:var(--gold);font-weight:600}
.pill.play::before{background:var(--gold2)}
.led{display:inline-block;width:7px;height:7px;border-radius:50%;background:var(--dim);margin-right:6px;vertical-align:1px;transition:background .08s,box-shadow .08s}
.led.on{background:var(--gold);box-shadow:0 0 12px var(--gold)}

/* ---------- buttons ---------- */
.btn{position:relative;display:inline-flex;align-items:center;gap:14px;padding:19px 34px;border:1px solid var(--line2);border-radius:999px;background:#14141466;backdrop-filter:blur(6px);font-size:16px;letter-spacing:.1em;overflow:hidden;isolation:isolate;transition:color .5s var(--ease),border-color .5s var(--ease),transform .6s var(--spring)}
.btn::before{content:"";position:absolute;z-index:-1;left:var(--x,50%);top:var(--y,50%);width:0;height:0;border-radius:50%;background:var(--ink);transform:translate(-50%,-50%);transition:width .7s var(--ease),height .7s var(--ease)}
.btn:hover{color:#141414;border-color:var(--ink)}.btn:hover::before{width:560px;height:560px}
.btn:active{transform:scale(.95)}
.btn.gold{border-color:var(--gold);color:var(--gold)}.btn.gold::before{background:var(--gold)}.btn.gold:hover{color:#141414}
.btn .ico{width:30px;height:30px;border-radius:50%;border:1px solid currentColor;display:grid;place-items:center;font-size:10px;transition:transform .6s var(--spring)}
.btn:hover .ico{transform:rotate(120deg) scale(1.08)}
.btn .arrow{transition:transform .6s var(--ease)}.btn:hover .arrow{transform:translateX(6px)}

/* ---------- shared ---------- */
section{position:relative}
.wrap{max-width:1240px;margin:0 auto;padding:0 32px}
.kicker{display:inline-flex;align-items:center;gap:14px;font-size:13px;letter-spacing:.42em;color:var(--grey);text-transform:uppercase}
.kicker i{display:inline-block;width:34px;height:1px;background:var(--gold);transform-origin:left}
.h2{font-family:var(--sans);font-weight:500;font-size:clamp(36px,5vw,72px);line-height:1.22;letter-spacing:.02em;margin:22px 0 22px;text-shadow:0 0 30px #141414,0 0 10px #141414}
.h2 em{font-style:normal;color:var(--gold)}
.lede{color:var(--grey);font-size:18px;line-height:1.95;max-width:600px;text-shadow:0 0 18px #141414,0 0 6px #141414}
.split .c{display:inline-block;will-change:transform,opacity,filter}

/* ---------- hero ---------- */
.hero{height:100vh;min-height:680px;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:0 20px}
.hero .eyebrow{font-size:13px;letter-spacing:.42em;color:var(--grey);margin-bottom:6px}
.hero h1{font-family:var(--sans);font-weight:500;font-size:clamp(96px,15vw,216px);letter-spacing:.14em;margin-right:-.14em;line-height:1.12;white-space:nowrap;overflow:hidden;padding:.04em 0;text-shadow:0 0 50px #141414,0 0 16px #141414}
html[data-lang="en"] .hero h1{font-size:clamp(44px,9.5vw,150px);letter-spacing:.1em;margin-right:-.1em}
.hero h1 .c{opacity:0}
.reduce-motion .hero h1 .c,.no-js .hero h1 .c{opacity:1}
.hero .tag{font-size:clamp(16px,1.5vw,21px);color:var(--grey);letter-spacing:.06em;text-wrap:balance;text-shadow:0 0 22px #141414,0 0 8px #141414;margin-top:26px;letter-spacing:.06em}
.hero .cta{display:flex;gap:16px;justify-content:center;flex-wrap:wrap;margin-top:44px}
.hero .hud{position:absolute;left:32px;right:32px;bottom:30px;display:flex;justify-content:space-between;align-items:center;font-size:12px;letter-spacing:.32em;color:var(--dim)}
.hero .hud b{color:var(--ink);font-weight:400}
.cue{position:absolute;left:50%;bottom:24px;transform:translateX(-50%);width:22px;height:36px;border:1px solid var(--line2);border-radius:12px}
.cue::after{content:"";position:absolute;left:50%;top:7px;width:3px;height:7px;margin-left:-1.5px;border-radius:2px;background:var(--gold);animation:cue 2s var(--ease) infinite}
@keyframes cue{0%{opacity:0;transform:translateY(-3px)}30%{opacity:1}100%{opacity:0;transform:translateY(12px)}}

/* ---------- film ---------- */
.film{padding:22vh 0 18vh}
.film .head{display:flex;justify-content:space-between;align-items:flex-end;gap:30px;flex-wrap:wrap}
.screen{position:relative;margin-top:56px;border-radius:6px;overflow:hidden;aspect-ratio:16/9;background:#000;will-change:transform,opacity}
.screen video{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.screen .shade{position:absolute;inset:0;background:radial-gradient(ellipse at 50% 60%,transparent 40%,#0008 100%);pointer-events:none}
.screen .corner{position:absolute;width:26px;height:26px;border-color:var(--gold);z-index:2}
.screen .tl{left:18px;top:18px;border-left:1.5px solid;border-top:1.5px solid}.screen .tr{right:18px;top:18px;border-right:1.5px solid;border-top:1.5px solid}
.screen .bl{left:18px;bottom:18px;border-left:1.5px solid;border-bottom:1.5px solid}.screen .br{right:18px;bottom:18px;border-right:1.5px solid;border-bottom:1.5px solid}
.playbig{position:absolute;left:44px;bottom:40px;z-index:3;display:flex;flex-direction:row;align-items:center;gap:18px;color:var(--ink);font-size:13px;letter-spacing:.4em}
.playbig .disc{position:relative;width:84px;height:84px;border-radius:50%;border:1px solid #ffffff55;display:grid;place-items:center;backdrop-filter:blur(8px);background:#14141444;transition:transform .7s var(--spring),border-color .4s}
.playbig .disc::after{content:"";position:absolute;inset:-1px;border-radius:50%;border:1px solid var(--gold);animation:ping 1.333s var(--ease) infinite}
.playbig:hover .disc{transform:scale(1.12);border-color:var(--gold)}
.playbig svg{width:26px;height:26px;margin-left:5px}
@keyframes ping{from{transform:scale(1);opacity:.9}to{transform:scale(1.7);opacity:0}}
.film .meta{display:flex;justify-content:space-between;margin-top:16px;font-size:12px;letter-spacing:.3em;color:var(--dim)}

/* ---------- prologue (pinned verses) ---------- */
.prologue{height:600vh}
.prologue .stage{position:sticky;top:0;height:100vh;display:grid;place-items:center;overflow:hidden}
.verse{position:absolute;left:0;right:0;top:50%;transform:translateY(-50%);text-align:center;padding:0 8vw;opacity:0}
.verse .zh,.verse .en{display:block}
.verse p{font-family:var(--serif);font-size:clamp(30px,4.8vw,72px);line-height:1.45;letter-spacing:.06em;text-shadow:0 0 34px #141414,0 0 14px #141414,0 0 4px #141414}
html[data-lang="en"] .verse p{letter-spacing:.01em;font-size:clamp(28px,4.2vw,64px)}
.verse small{display:block;margin-top:24px;font-size:13px;letter-spacing:.42em;color:var(--grey);text-transform:uppercase}
.verse em{font-style:normal;color:var(--gold)}
.prologue .meter{position:absolute;left:50%;bottom:8vh;transform:translateX(-50%);display:flex;gap:10px}
.prologue .meter i{width:28px;height:2px;background:var(--line2);overflow:hidden;position:relative}
.prologue .meter i b{position:absolute;inset:0;background:var(--gold);transform:scaleX(0);transform-origin:left}

/* ---------- six scales (horizontal) ---------- */
.scales{height:100vh;overflow:hidden}
.scales .track{display:flex;height:100vh;will-change:transform}
.panel{flex:0 0 100vw;height:100vh;display:grid;grid-template-columns:minmax(0,5fr) minmax(0,7fr);align-items:center;gap:5vw;padding:0 7vw;position:relative}
.panel .num{position:absolute;left:5vw;top:12vh;font-family:var(--thin);font-size:clamp(120px,18vw,300px);line-height:1;color:transparent;-webkit-text-stroke:1px #ffffff1c;pointer-events:none}
.panel .txt{position:relative}
.panel .bpm{font-size:13px;letter-spacing:.42em;color:var(--gold)}
.panel h3{font-family:var(--sans);font-weight:500;font-size:clamp(44px,5.4vw,88px);line-height:1.1;margin:16px 0 8px;letter-spacing:.06em}
.panel .name{font-family:var(--thin);font-size:15px;letter-spacing:.6em;color:var(--grey)}
.panel .mech{display:inline-flex;align-items:center;gap:10px;margin-top:28px;padding:8px 16px;border:1px solid #ffc94d66;border-radius:999px;color:var(--gold);font-size:14px;letter-spacing:.12em;background:#14141488}
.panel p{color:var(--grey);font-size:17px;line-height:1.9;text-shadow:0 0 16px #141414,0 0 6px #141414;margin-top:20px;max-width:440px}
.panel .shot{position:relative;border-radius:10px;overflow:hidden;aspect-ratio:16/7;border:1px solid var(--line2);background:#0d0d0d;box-shadow:0 40px 120px #000a}
.panel .shot img{position:absolute;inset:0 -12%;width:124%;height:100%;object-fit:cover;will-change:transform}
.panel .shot .cap{position:absolute;left:18px;bottom:14px;font-size:11px;letter-spacing:.32em;color:var(--grey);background:#141414cc;padding:4px 10px;border-radius:4px}
.scales .rail{position:absolute;left:7vw;right:7vw;bottom:7vh;height:1px;background:var(--line2);z-index:3}
.scales .rail b{position:absolute;left:0;top:-1px;height:3px;background:var(--gold);width:0}
.scales .hudr{position:absolute;right:7vw;top:12vh;z-index:3;text-align:right}
.scales .hudr b{display:block;font-family:var(--thin);font-size:clamp(54px,6vw,96px);font-weight:200;line-height:1}
.scales .hudr span{font-size:12px;letter-spacing:.5em;color:var(--dim)}

/* ---------- mechanics ---------- */
.mech-sec{padding:20vh 0 14vh}
.cards{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;margin-top:64px}
.card{position:relative;padding:34px 28px 30px;border:1px solid var(--line);border-radius:18px;background:#161616dd;backdrop-filter:blur(10px);overflow:hidden;transition:border-color .5s,transform .7s var(--spring)}
.card::before{content:"";position:absolute;inset:0;background:radial-gradient(360px circle at var(--mx,50%) var(--my,0%),#ffc94d1f,transparent 60%);opacity:0;transition:opacity .5s}
.card:hover{border-color:#ffc94d55;transform:translateY(-8px)}.card:hover::before{opacity:1}
.card svg{width:64px;height:64px;margin-bottom:26px;overflow:visible}
.card h4{font-family:var(--sans);font-weight:500;font-size:24px;letter-spacing:.08em}
.card .k{display:block;font-size:12px;letter-spacing:.4em;color:var(--dim);margin-top:6px}
.card p{color:var(--grey);font-size:15px;line-height:1.85;margin-top:16px}
.draw{stroke-dasharray:var(--len,300);stroke-dashoffset:var(--len,300);transition:stroke-dashoffset 1.6s var(--ease)}
.card.in .draw{stroke-dashoffset:0}

/* ---------- trainer ---------- */
.trainer{padding:14vh 0 18vh}
.trainer .grid{display:grid;grid-template-columns:1fr 1fr;gap:64px;align-items:center}
.pad{position:relative;aspect-ratio:1;max-width:500px;width:100%;margin-left:auto;border-radius:50%;border:1px solid var(--line2);background:radial-gradient(circle,#1d1d1dcc,#121212ee 70%);touch-action:manipulation;user-select:none;box-shadow:0 0 0 18px #1414144d,0 0 0 19px var(--line)}
.pad canvas{position:absolute;inset:0;width:100%;height:100%;border-radius:50%}
.pad .hint{position:absolute;left:0;right:0;bottom:16%;text-align:center;font-size:11px;letter-spacing:.4em;color:var(--grey);pointer-events:none}
.readout{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:34px;max-width:520px}
.readout div{border-top:1px solid var(--line2);padding-top:14px}
.readout b{display:block;font-family:var(--thin);font-size:40px;font-weight:200}
.readout span{font-size:12px;letter-spacing:.3em;color:var(--dim)}
.ruler{position:relative;height:34px;margin-top:26px;max-width:520px;border-bottom:1px solid var(--line2)}
.ruler .z{position:absolute;bottom:0;left:50%;transform:translateX(-50%);height:100%}
.ruler .good{width:44%;background:linear-gradient(#ededed00,#ededed10)}
.ruler .perf{width:20%;background:linear-gradient(#ffc94d00,#ffc94d2a);border-bottom:2px solid var(--gold)}
.ruler i{position:absolute;bottom:0;width:2px;height:100%;background:var(--ink);transform:translateX(-50%);animation:drop .8s var(--ease) both}
.ruler i.p{background:var(--gold)}
@keyframes drop{from{height:0;opacity:1}to{height:100%;opacity:.4}}
.ruler-l{display:flex;justify-content:space-between;max-width:520px;margin-top:8px;font-size:10px;color:var(--dim);letter-spacing:.1em}

/* ---------- final ---------- */
.final{height:110vh;display:grid;place-items:center;text-align:center}
.final .h2{font-family:var(--serif);font-size:clamp(48px,8vw,128px);font-weight:400;letter-spacing:.08em}
.h2 em{white-space:nowrap}
.sdots{position:absolute;right:28px;top:50%;transform:translateY(-50%);z-index:4;display:flex;flex-direction:column;gap:14px}
.sdots button{width:8px;height:8px;border-radius:50%;background:var(--line2);cursor:pointer;transition:background .3s,transform .4s var(--spring)}
.sdots button:hover{background:var(--grey);transform:scale(1.3)}.sdots button.on{background:var(--ink);transform:scale(1.25)}
.final .small{color:var(--grey);font-size:13px;letter-spacing:.3em;margin-top:30px}
footer{border-top:1px solid var(--line);padding:34px 32px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px;color:var(--dim);font-size:13px;letter-spacing:.08em;background:#141414cc}
footer a:hover{color:var(--ink)}

/* ---------- trailer modal ---------- */
.modal{position:fixed;inset:0;z-index:200;display:grid;place-items:center;background:#0b0b0bf2;opacity:0;visibility:hidden;transition:opacity .6s var(--ease),visibility .6s}
.modal.open{opacity:1;visibility:visible}
.modal video{width:min(92vw,163vh);aspect-ratio:16/9;background:#000;border-radius:6px;transform:scale(.94);transition:transform .8s var(--ease);box-shadow:0 60px 160px #000}
.modal.open video{transform:none}
.modal .x{position:absolute;right:26px;top:22px;width:48px;height:48px;border-radius:50%;border:1px solid var(--line2);color:var(--ink);font-size:20px;transition:transform .5s var(--spring),border-color .3s}
.modal .x:hover{transform:rotate(90deg);border-color:var(--gold)}

/* ---------- progress ring ---------- */
.ring{position:fixed;right:24px;bottom:24px;z-index:50;width:46px;height:46px;opacity:0;transition:opacity .5s}
.ring.on{opacity:1}.ring circle{fill:none;stroke-width:1.5}

@media (max-width:900px){
 .nav{padding:14px 16px}.nav .back{display:none}.nav .pill.beat{display:none}
 .panel{grid-template-columns:1fr;padding:12vh 7vw 14vh;gap:28px;align-content:center}
 .panel .shot{aspect-ratio:16/9}
 .cards{grid-template-columns:1fr 1fr}
 .trainer .grid{grid-template-columns:1fr}.pad{margin:0 auto}
 .hero .hud{font-size:9px;letter-spacing:.2em}
}
@media (max-width:560px){.brand span{display:none}.nav-r{gap:6px}.pill{padding:7px 12px}.playbig{left:18px;bottom:16px}.playbig .disc{width:56px;height:56px}.playbig>span:last-child{display:none}.cards{grid-template-columns:1fr}.hero h1{letter-spacing:.08em;margin-right:-.08em}html[data-lang="en"] .hero h1{letter-spacing:.04em;margin-right:-.04em}.nav-r .pill.lang{padding:6px 10px}}
@media (prefers-reduced-motion:reduce){
 .grain,.cue::after,.playbig .disc::after{animation:none}
 .hero h1 .c{transform:none}
 .verse{opacity:1;position:relative;top:auto;transform:none;padding:8vh 8vw}
 .prologue{height:auto}.prologue .stage{position:relative;height:auto;display:block;padding:10vh 0}
 .scales{height:auto}.scales .track{flex-direction:column;height:auto}.panel{height:auto;padding:12vh 7vw}
}