/* ABOUT / quiet movement. Deliberately no descriptive copy. */
#about{padding:0;overflow-x:hidden;background:#fff;isolation:isolate}
#about .about-head{position:relative;z-index:4;padding:22px 32px;gap:18px;background:linear-gradient(#fff 55%,#fff0)}
#about .about-head h1{font-size:12px;letter-spacing:.13em;line-height:1.6;max-width:70%}
#about .about-head button{font-size:12px;letter-spacing:.1em;white-space:nowrap}
#about-field{position:absolute;inset:0;width:100%;height:100%;pointer-events:none;z-index:-1}
.about-index{position:absolute;left:8%;right:8%;top:28%;display:flex;align-items:center;justify-content:space-between;font:12px Arial;letter-spacing:.12em;pointer-events:none}
#about-count{font-size:12px;opacity:.8}#about-mark{font-size:18px;color:#247ca0;font-weight:400}
.about-center{position:absolute;left:50%;top:47%;transform:translate(-50%,-50%);width:100%;text-align:center;padding:20px}
#about-keyword{position:relative;display:inline-flex;justify-content:center;align-items:center;padding:20px 18px;max-width:100%;font-size:clamp(54px,12.5vw,168px);letter-spacing:-.04em;line-height:1;font-weight:400;white-space:nowrap;isolation:isolate}
#about-keyword:before{content:"";position:absolute;inset:-10px -45px;background:radial-gradient(ellipse,#fff 5%,#fffffff0 38%,#fff0 73%);z-index:-1;pointer-events:none}
.about-letter{display:inline-block;transform-origin:50% 100%;will-change:transform,opacity;position:relative}
#about[data-chapter="3"] #about-keyword{font-size:clamp(40px,10.5vw,144px)}
.about-trace{width:min(44vw,520px);height:30px;margin:38px auto 0;display:flex;align-items:center;gap:24px;opacity:.55}.about-trace i{height:1px;background:#9b9b9b;flex:1;transform:scaleX(var(--trace,1));transition:transform .7s cubic-bezier(.18,.9,.16,1)}.about-trace i:first-child{transform-origin:right}.about-trace i:last-child{transform-origin:left}.about-trace b{width:3px;height:3px;background:#247ca0;border-radius:50%;font-weight:400;transform:translateX(var(--drift,0px));transition:transform 1s cubic-bezier(.16,.8,.2,1)}
.about-foot{position:absolute;bottom:max(24px,env(safe-area-inset-bottom));left:32px;right:32px;display:flex;align-items:center;justify-content:space-between;gap:28px;z-index:4}.about-chapters{display:flex;align-items:center;gap:24px}.about-chapters button{position:relative;display:flex;align-items:center;gap:8px;min-height:44px;padding:10px 3px;font-size:12px;letter-spacing:.08em;white-space:nowrap;color:#707070;transition:color .25s}.about-chapters small{font-size:10px;letter-spacing:.05em}.about-chapters button:before{content:"";position:absolute;bottom:3px;left:3px;right:3px;height:1px;background:currentColor;transform:scaleX(0);transform-origin:left;transition:transform .6s cubic-bezier(.16,.8,.2,1)}.about-chapters button[aria-pressed="true"]{color:#505050}.about-chapters button[aria-pressed="true"]:before{transform:scaleX(1)}.about-playback{display:flex;align-items:center;gap:22px}.about-playback button{font-size:12px;letter-spacing:.1em;min-height:44px;padding:10px 0;white-space:nowrap}#about-sound-line{width:90px;height:18px}
#about .about-head button:hover,.about-playback button:hover,.about-chapters button:hover{color:#247ca0}
@media(max-width:900px){.about-foot{flex-direction:column;gap:20px}.about-chapters{gap:clamp(14px,4vw,32px)}.about-playback{width:100%;justify-content:space-between}.about-playback canvas{margin-left:auto}.about-index{top:26%}.about-center{top:44%}}
@media(max-width:550px){#about .about-head{padding:16px 20px;align-items:flex-start;gap:12px}#about .about-head h1{font-size:12px;max-width:68%;padding-top:12px;letter-spacing:.08em}#about .about-head button{font-size:12px}.about-foot{left:20px;right:20px;bottom:18px;gap:20px}.about-chapters{justify-content:space-between;width:100%;gap:6px}.about-chapters button{gap:5px;letter-spacing:.03em;font-size:12px;flex-direction:column;padding:8px 2px;min-width:44px;min-height:50px;justify-content:center}.about-chapters small{font-size:10px}.about-index{left:8%;right:8%;top:24%}.about-center{top:43%;padding:12px}.about-trace{width:58vw;margin-top:26px;gap:18px}#about-keyword{padding:20px 4px}#about-keyword:before{inset:-4px -20px}.about-playback{gap:18px}.about-playback button{font-size:12px}#about-sound-line{width:64px}}
@media(max-height:500px) and (min-width:551px){.about-center{top:45%}#about-keyword{font-size:72px;padding:10px}#about[data-chapter="3"] #about-keyword{font-size:64px}.about-index{top:25%}.about-trace{margin-top:4px}.about-foot{flex-direction:row;bottom:12px}.about-chapters{gap:14px}.about-chapters button,.about-playback button{font-size:11px}.about-playback{width:auto;gap:16px}.about-playback canvas{display:none}}
@media(prefers-reduced-motion:reduce){.about-letter{transform:none!important;opacity:1!important}.about-trace *{transition:none!important}}