/* ==========================================================================
   輪廻転生 | 佐伯珀空 — Special Site
   Design tokens
   ========================================================================== */
:root{
  --ink:#0c0b0b;
  --ink-soft:#131211;
  --charcoal:#39373a;
  --wine-deep:#3a161c;
  --wine:#6d2b34;
  --wine-light:#8e3a41;
  --vermilion:#ff4433;
  --vermilion-dim:#c23325;
  --amber:#d3a259;
  --amber-soft:#e9c98a;
  --scribble:#7b1a14;
  --scribble-ink:#160705;
  --cream:#eef0cf;
  --mist:#ada99c;
  --mist-dim:#726f66;

  --font-mincho:'Shippori Mincho', serif;
  --font-serif-lat:'Cormorant Garamond', serif;
  --font-sans:'Noto Sans JP', sans-serif;
  --font-mono:'Space Mono', monospace;
  --font-mono:'Space Mono', monospace;

  --ease-out:cubic-bezier(.16,.8,.24,1);
  --ease-in-out:cubic-bezier(.65,0,.35,1);
  --dur-s:.6s;
  --dur-m:1.1s;
  --dur-l:1.8s;

  --edge:clamp(20px,6vw,72px);
}

*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth;}
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto;}
}
body{
  margin:0;
  background:var(--ink);
  color:var(--cream);
  font-family:var(--font-sans);
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-x:hidden;
}
img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;}
h1,h2,h3,p{margin:0;}
ul{margin:0;padding:0;list-style:none;}

.skip-link{
  position:absolute;left:-999px;top:0;background:var(--amber);color:var(--ink);
  padding:.8em 1.2em;z-index:999;font-family:var(--font-mono);font-size:.85rem;
}
.skip-link:focus{left:var(--edge);top:var(--edge);}

:focus-visible{outline:2px solid var(--amber-soft);outline-offset:4px;}

/* grain overlay -------------------------------------------------------- */
.grain{
  position:fixed;inset:0;pointer-events:none;z-index:500;opacity:.05;mix-blend-mode:overlay;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* progress rail ---------------------------------------------------------- */
.progress-rail{
  position:fixed;right:14px;top:14vh;bottom:14vh;width:1px;background:rgba(238,240,207,.12);
  z-index:400;
}
.progress-fill{
  position:absolute;left:0;top:0;width:100%;height:0%;background:linear-gradient(var(--vermilion),var(--amber));
  transform-origin:top;
}
@media (max-width:760px){.progress-rail{display:none;}}

/* preloader ---------------------------------------------------------- */
#preloader{
  position:fixed;inset:0;z-index:900;background:var(--ink);
  display:flex;align-items:center;justify-content:center;
  transition:opacity .9s var(--ease-out),visibility .9s var(--ease-out);
}
#preloader.is-hidden{opacity:0;visibility:hidden;pointer-events:none;}
.pre-content{display:flex;flex-direction:column;align-items:center;gap:20px;}
.pre-mark{
  font-family:var(--font-mincho);font-weight:600;font-size:clamp(2.2rem,7vw,3.4rem);
  color:var(--cream);letter-spacing:.08em;
  animation:preMarkGlow 1.8s var(--ease-in-out) infinite;
}
.pre-mark .bracket{color:var(--amber);font-weight:400;}
@keyframes preMarkGlow{
  0%,100%{opacity:.72;text-shadow:0 0 0 rgba(211,162,89,0);}
  50%{opacity:1;text-shadow:0 0 22px rgba(211,162,89,.45);}
}
.pre-hourglass{width:clamp(30px,6vw,42px);height:auto;overflow:visible;}
.hg-frame{fill:var(--amber);}
.hg-glass{fill:none;stroke:rgba(238,240,207,.5);stroke-width:1.6;stroke-linejoin:round;}
.hg-sand{fill:var(--vermilion);}
.hg-sand-top{
  transform-box:fill-box;transform-origin:50% 100%;
  animation:hgDrain 1.5s cubic-bezier(.55,0,.85,.35) infinite;
}
.hg-sand-bottom{
  transform-box:fill-box;transform-origin:50% 100%;
  animation:hgFill 1.5s cubic-bezier(.15,.65,.45,1) infinite;
}
.hg-drip{
  fill:var(--vermilion);
  animation:hgDrip 1.5s linear infinite;
}
@keyframes hgDrain{
  0%{transform:scaleY(1);}
  85%{transform:scaleY(.04);}
  100%{transform:scaleY(.04);}
}
@keyframes hgFill{
  0%,15%{transform:scaleY(.04);}
  100%{transform:scaleY(1);}
}
@keyframes hgDrip{
  0%,15%{opacity:0;transform:translateY(0);}
  25%{opacity:1;}
  80%{opacity:1;transform:translateY(44px);}
  85%,100%{opacity:0;transform:translateY(46px);}
}
@media (prefers-reduced-motion: reduce){
  .pre-mark{animation:none;opacity:1;}
  .hg-sand-top{animation:none;transform:scaleY(.5);}
  .hg-sand-bottom{animation:none;transform:scaleY(.5);}
  .hg-drip{animation:none;opacity:0;}
}

/* header ---------------------------------------------------------- */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:300;
  display:flex;align-items:center;justify-content:center;
  padding:20px var(--edge);
  opacity:0;transform:translateY(-12px);
  transition:opacity var(--dur-m) var(--ease-out),transform var(--dur-m) var(--ease-out);
  pointer-events:none;
}
.site-header.is-visible{opacity:1;transform:translateY(0);pointer-events:auto;}
.site-header .mark{
  font-family:var(--font-mono);font-size:.72rem;letter-spacing:.28em;
  color:var(--mist);text-transform:uppercase;
}

/* reveal helpers ---------------------------------------------------------- */
[data-reveal]{
  opacity:0;transform:translateY(26px);
  transition:opacity var(--dur-m) var(--ease-out),transform var(--dur-m) var(--ease-out);
}
[data-reveal].is-visible{opacity:1;transform:translateY(0);}

.line-mask{overflow:hidden;display:block;}
.line-inner{
  display:block;transform:translateY(110%);opacity:0;
  transition:transform var(--dur-m) var(--ease-out),opacity var(--dur-m) var(--ease-out);
  transition-delay:var(--d,0s);
}
.is-visible .line-inner{transform:translateY(0);opacity:1;}

@media (prefers-reduced-motion: reduce){
  [data-reveal],.line-inner{opacity:1!important;transform:none!important;transition:none!important;}
}

/* hero ---------------------------------------------------------- */
.hero{
  position:relative;min-height:100svh;display:flex;align-items:center;justify-content:center;
  overflow:hidden;background:var(--ink);
}
.hero-bg{
  position:absolute;inset:-8% -4%;background-size:cover;background-position:center 30%;
  filter:saturate(.85) brightness(.6);will-change:transform;
}
.hero-overlay{
  position:absolute;inset:0;
  background:
    radial-gradient(ellipse at 50% 30%, rgba(12,11,11,.15) 0%, rgba(12,11,11,.72) 62%, rgba(12,11,11,.96) 100%),
    linear-gradient(180deg, rgba(12,11,11,.55) 0%, rgba(12,11,11,.35) 30%, rgba(12,11,11,.85) 100%);
}
.hero-infinity{
  position:absolute;left:50%;top:50%;transform:translate(-50%,-52%);
  width:min(920px,140vw);height:auto;opacity:.55;pointer-events:none;
}
.hero-infinity path{
  fill:none;stroke:var(--vermilion);stroke-width:2.4;stroke-linecap:round;
}
.hero-content{
  position:relative;z-index:2;text-align:center;padding:0 var(--edge);
  display:flex;flex-direction:column;align-items:center;gap:clamp(14px,2.4vw,26px);
}
.kicker{
  font-family:var(--font-mono);font-size:.72rem;letter-spacing:.4em;text-transform:uppercase;
  color:var(--amber-soft);
}
.hero-title{
  font-family:var(--font-mincho);font-weight:800;
  font-size:clamp(3.4rem,13vw,9.5rem);letter-spacing:.06em;line-height:1;
  color:var(--cream);text-shadow:0 8px 60px rgba(0,0,0,.5);
}
.hero-title span{
  display:inline-block;opacity:0;transform:translateY(40px);filter:blur(6px);
  transition:opacity 1s var(--ease-out),transform 1s var(--ease-out),filter 1s var(--ease-out);
}
.hero-title.is-visible span{opacity:1;transform:translateY(0);filter:blur(0);}
.hero-title.is-visible span:nth-child(1){transition-delay:.15s;}
.hero-title.is-visible span:nth-child(2){transition-delay:.32s;}
.hero-title.is-visible span:nth-child(3){transition-delay:.49s;}
.hero-title.is-visible span:nth-child(4){transition-delay:.66s;}
.hero-artist{
  font-family:var(--font-serif-lat);font-style:italic;font-weight:500;
  font-size:clamp(1rem,2vw,1.3rem);color:var(--mist);letter-spacing:.06em;
}
.scroll-cue{
  position:absolute;left:50%;right:50%;bottom:clamp(20px,4vh,44px);transform:translateX(-50%);
  display:flex;flex-direction:column;align-items:center;gap:10px;z-index:2;
  font-family:var(--font-mono);font-size:.65rem;letter-spacing:.35em;color:var(--mist);
}
.scroll-cue .rail{width:1px;height:44px;background:rgba(238,240,207,.25);position:relative;overflow:hidden;}
.scroll-cue .dot{position:absolute;left:-1.5px;top:0;width:4px;height:4px;border-radius:50%;background:var(--amber-soft);animation:cueDrop 2.2s var(--ease-in-out) infinite;}
@keyframes cueDrop{0%{top:-6px;opacity:0}20%{opacity:1}90%{opacity:0}100%{top:100%;opacity:0}}
@media (prefers-reduced-motion: reduce){.scroll-cue .dot{animation:none;top:20px;opacity:.7;}}

/* lyric sections ---------------------------------------------------------- */
.lyric-section{
  position:relative;padding:clamp(80px,16vh,180px) var(--edge);
  display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;
  background:var(--ink-soft);
}
.lyric-section.deep{
  background:radial-gradient(ellipse at 50% 50%, var(--wine) 0%, var(--wine-deep) 55%, var(--ink) 100%);
}
.lyric-bracket{
  font-family:var(--font-mincho);color:var(--mist-dim);font-size:clamp(1.4rem,3vw,2.2rem);line-height:1;
}
.lyric-text{
  font-family:var(--font-mincho);font-weight:600;
  font-size:clamp(1.9rem,6vw,4.2rem);line-height:1.35;color:var(--cream);
  margin:.2em 0;
}
.lyric-text .line-mask{margin:0 auto;}

/* jacket showcase ---------------------------------------------------------- */
.jacket-section{
  position:relative;padding:clamp(90px,18vh,200px) var(--edge);
  display:flex;flex-direction:column;align-items:center;gap:clamp(26px,4vw,48px);
  background:linear-gradient(180deg,var(--ink-soft) 0%,var(--ink) 100%);
  text-align:center;
}
.eyebrow{
  font-family:var(--font-mono);font-size:.7rem;letter-spacing:.4em;text-transform:uppercase;
  color:var(--amber);
}
.jacket-frame{
  position:relative;width:min(420px,78vw);border-radius:6px;overflow:hidden;
  box-shadow:0 40px 100px -20px rgba(0,0,0,.7),0 0 0 1px rgba(238,240,207,.08);
  will-change:transform;
}
.jacket-frame img{width:100%;height:auto;transition:transform 1.1s var(--ease-out);}
.jacket-frame:hover img{transform:scale(1.04);}
.jacket-note{
  font-family:var(--font-sans);font-weight:300;font-size:.92rem;color:var(--mist);
  max-width:32ch;
}

/* artist / mystery reveal ---------------------------------------------------------- */
.reveal-section{
  position:relative;padding:clamp(100px,20vh,220px) var(--edge);
  display:flex;flex-direction:column;align-items:center;gap:clamp(40px,6vw,72px);text-align:center;
  background:var(--ink);
  overflow:hidden;
}
.glitch{position:relative;color:var(--cream);}
.glitch::before,.glitch::after{
  content:attr(data-text);position:absolute;left:50%;top:0;transform:translateX(-50%);
  width:100%;opacity:0;
}
.glitch.is-active::before{
  color:var(--vermilion);mix-blend-mode:screen;opacity:.75;
  animation:glitchA 2.6s steps(1,end) infinite;
}
.glitch.is-active::after{
  color:var(--amber);mix-blend-mode:screen;opacity:.65;
  animation:glitchB 3.1s steps(1,end) infinite;
}
@keyframes glitchA{
  0%,92%,100%{clip-path:inset(0 0 100% 0);transform:translateX(-50%);}
  93%{clip-path:inset(10% 0 60% 0);transform:translate(calc(-50% - 6px),0);}
  95%{clip-path:inset(55% 0 10% 0);transform:translate(calc(-50% + 5px),0);}
  97%{clip-path:inset(30% 0 40% 0);transform:translate(calc(-50% - 3px),0);}
}
@keyframes glitchB{
  0%,90%,100%{clip-path:inset(100% 0 0 0);transform:translateX(-50%);}
  91%{clip-path:inset(65% 0 5% 0);transform:translate(calc(-50% + 6px),0);}
  94%{clip-path:inset(5% 0 70% 0);transform:translate(calc(-50% - 5px),0);}
  98%{clip-path:inset(40% 0 30% 0);transform:translate(calc(-50% + 3px),0);}
}
@media (prefers-reduced-motion: reduce){
  .glitch.is-active::before,.glitch.is-active::after{animation:none;opacity:0;}
}
.artist-card{
  position:relative;width:clamp(180px,26vw,240px);aspect-ratio:1;border-radius:50%;
  display:flex;align-items:center;justify-content:center;
  background:rgba(238,240,207,.04);
  backdrop-filter:blur(6px);
  border:1px solid rgba(211,162,89,.35);
  box-shadow:0 0 0 1px rgba(238,240,207,.03), 0 30px 80px -20px rgba(0,0,0,.6);
}
.artist-glow{
  position:absolute;inset:-30%;border-radius:50%;
  background:radial-gradient(circle,rgba(211,162,89,.35) 0%,rgba(211,162,89,0) 70%);
  animation:pulseGlow 4.5s var(--ease-in-out) infinite;
  z-index:-1;
}
@keyframes pulseGlow{0%,100%{opacity:.5;transform:scale(1);}50%{opacity:.9;transform:scale(1.12);}}
@media (prefers-reduced-motion: reduce){.artist-glow{animation:none;opacity:.6;}}
.artist-card img{width:56%;height:56%;object-fit:contain;}
.artist-name{
  font-family:var(--font-mincho);font-weight:600;font-size:clamp(1.4rem,3vw,2rem);
  letter-spacing:.14em;color:var(--cream);
}

/* hand-drawn doodles (MV art motif) ---------------------------------------------------------- */
.doodle-defs{position:absolute;width:0;height:0;overflow:hidden;}
.doodle{
  position:absolute;pointer-events:none;filter:url(#roughen);
  opacity:0;transition:opacity .8s var(--ease-out);height:auto;
}
.doodle.is-visible{opacity:1;}
.doodle-a{aspect-ratio:1/1;}
.doodle-b{aspect-ratio:8/5;}
.doodle-q{aspect-ratio:6/7;}
.doodle .outline{fill:none;stroke:var(--scribble-ink);stroke-linecap:round;stroke-linejoin:round;}
.doodle .fill{fill:none;stroke:var(--scribble);stroke-linecap:round;stroke-linejoin:round;}
.doodle-mark{fill:var(--scribble);stroke:var(--scribble-ink);stroke-width:2;}
@media (prefers-reduced-motion: reduce){
  .doodle{filter:none;}
}

/* MV teaser ---------------------------------------------------------- */
.mv-section{
  position:relative;padding:clamp(100px,18vh,200px) var(--edge);
  display:flex;flex-direction:column;
  align-items:center;
  gap:clamp(28px,4vw,40px);
  background:var(--ink);
  overflow:hidden;
  text-align:center;
}
.mv-frame{
  position:relative;width:min(720px,88vw);aspect-ratio:16/9;border-radius:4px;
  background:
    repeating-linear-gradient(115deg, rgba(238,240,207,.05) 0px, rgba(238,240,207,.05) 1px, transparent 1px, transparent 26px),
    linear-gradient(160deg,#141312 0%,#0c0b0b 100%);
  border:1px solid rgba(238,240,207,.14);
  display:flex;align-items:center;justify-content:center;
  box-shadow:0 40px 110px -24px rgba(0,0,0,.75);
}
.mv-play{
  width:clamp(60px,9vw,84px);height:clamp(60px,9vw,84px);
  filter:url(#roughen);
}
.mv-play circle{fill:none;stroke:var(--cream);stroke-width:2.4;opacity:.75;}
.mv-play path{fill:var(--scribble);stroke:var(--scribble-ink);stroke-width:2;}
.mv-caption{
  font-family:var(--font-sans);font-weight:300;font-size:.92rem;color:var(--mist);
  max-width:34ch;
}
.mv-doodle-l{left:clamp(-40px,-2vw,-10px);top:8%;width:clamp(140px,20vw,240px);}
.mv-doodle-r{right:clamp(-50px,-3vw,-10px);bottom:6%;width:clamp(160px,24vw,300px);}
.mv-doodle-q{left:50%;top:-2%;width:70px;transform:translateX(-160px);}
@media (max-width:640px){
  .mv-doodle-l{width:120px;top:-6%;left:-24px;}
  .mv-doodle-r{width:140px;bottom:-8%;right:-20px;}
}

.youtube-wrapper {
  position: relative;
  width: 150%;
  left: 50%;
  transform: translateX(-50%);
  aspect-ratio: 16 / 9;
}

.youtube-wrapper iframe {
  width: 100%;
  height: 100%;
  border: 0;
}

/* closing ---------------------------------------------------------- */
.closing-section{
  position:relative;min-height:92vh;display:flex;align-items:center;justify-content:center;
  text-align:center;padding:0 var(--edge);overflow:hidden;
  background:radial-gradient(ellipse at 50% 60%,var(--wine-deep) 0%,var(--ink) 70%);
}
.closing-infinity{
  position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);
  width:min(1100px,160vw);opacity:.28;pointer-events:none;
  animation:slowSpin 90s linear infinite;
}
.closing-infinity path{fill:none;stroke:var(--amber);stroke-width:1.4;}
@keyframes slowSpin{to{transform:translate(-50%,-50%) rotate(360deg);}}
@media (prefers-reduced-motion: reduce){.closing-infinity{animation:none;}}
.closing-title{
  position:relative;z-index:2;font-family:var(--font-mincho);font-weight:800;
  font-size:clamp(2.4rem,8vw,6rem);line-height:1.3;color:var(--cream);
}
.closing-title .line-mask{margin:0 auto;}

/* CTA ---------------------------------------------------------- */
.cta-section{
  position:relative;padding:clamp(80px,16vh,160px) 0 clamp(60px,10vh,120px);
  background:var(--ink-soft);
  display:flex;flex-direction:column;align-items:center;gap:clamp(40px,6vw,64px);
  overflow:hidden;
}
.marquee{
  width:100%;overflow:hidden;
  -webkit-mask-image:linear-gradient(90deg,transparent,#000 8%,#000 92%,transparent);
  mask-image:linear-gradient(90deg,transparent,#000 8%,#000 92%,transparent);
}
.marquee-track{
  display:flex;gap:3rem;width:max-content;
  animation:marqueeMove 42s linear infinite;
}
.marquee-track span{
  font-family:var(--font-mincho);font-size:clamp(1rem,2.4vw,1.5rem);color:var(--mist-dim);
  white-space:nowrap;
}
@keyframes marqueeMove{from{transform:translateX(0);}to{transform:translateX(-50%);}}
@media (prefers-reduced-motion: reduce){.marquee-track{animation:none;}}
.cta-title{
  font-family:var(--font-mincho);font-weight:600;font-size:clamp(1.6rem,4vw,2.4rem);
  color:var(--cream);text-align:center;padding:0 var(--edge);
}
.cta-buttons{
  display:flex;flex-wrap:wrap;justify-content:center;gap:clamp(14px,2vw,22px);padding:0 var(--edge);
}
.btn{
  position:relative;display:flex;flex-direction:column;align-items:center;gap:4px;
  padding:1.1em 2.2em;border:1px solid rgba(238,240,207,.28);border-radius:999px;
  font-family:var(--font-mono);font-size:.85rem;letter-spacing:.18em;text-transform:uppercase;
  color:var(--cream);transition:border-color .5s var(--ease-out),background .5s var(--ease-out),transform .35s var(--ease-out);
}
.btn:hover{border-color:var(--amber);background:rgba(211,162,89,.08);transform:translateY(-2px);}
.btn-primary{background:var(--vermilion);border-color:var(--vermilion);color:var(--ink);}
.btn-primary:hover{background:var(--amber);border-color:var(--amber);color:var(--ink);}
.btn-note{font-size:.65rem;letter-spacing:.1em;opacity:.6;text-transform:none;}

/* credit ---------------------------------------------------------- */
.credit-section{
  padding:clamp(70px,12vh,120px) var(--edge) clamp(40px,8vh,80px);
  background:var(--ink);
  display:flex;flex-direction:column;align-items:center;gap:clamp(26px,4vw,40px);
}
.credit-list{
  width:100%;max-width:560px;
  display:flex;flex-direction:column;
}
.credit-item{
  display:flex;align-items:baseline;justify-content:space-between;gap:1.5em;
  padding:1.1em 0;border-bottom:1px solid rgba(238,240,207,.12);
}
.credit-item:first-child{border-top:1px solid rgba(238,240,207,.12);}
.credit-role{
  font-family:var(--font-mono);font-size:.74rem;letter-spacing:.22em;text-transform:uppercase;
  color:var(--mist);white-space:nowrap;
}
.credit-name{
  font-family:var(--font-mincho);font-weight:500;font-size:clamp(1rem,2vw,1.2rem);
  color:var(--cream);text-align:right;letter-spacing:.03em;
}
@media (max-width:480px){
  .credit-item{flex-direction:column;align-items:flex-start;gap:.4em;}
  .credit-name{text-align:left;}
}


/* footer ---------------------------------------------------------- */
.site-footer{
  padding:clamp(40px,8vh,72px) var(--edge);
  display:flex;flex-direction:column;align-items:center;gap:18px;
  background:var(--ink);border-top:1px solid rgba(238,240,207,.08);
  text-align:center;
}
.footer-mark{display:flex;align-items:center;gap:10px;}
.footer-mark img{width:26px;height:26px;object-fit:contain;opacity:.8;}
.footer-mark span{font-family:var(--font-mincho);font-size:.95rem;letter-spacing:.12em;color:var(--mist);}
.site-footer p{font-family:var(--font-mono);font-size:.68rem;letter-spacing:.08em;color:var(--mist-dim);}

@media (max-width:640px){
  .lyric-section,.jacket-section,.reveal-section{padding-left:20px;padding-right:20px;}
}