/* Direction A, vertical: the same negative, stood on end.
   No transport hijack here. The page scrolls; the film is the page. */

:root{
  --rail:54px;                    /* perforated margins, now left and right */
  --gap:16px;
  --film-w:min(760px,calc(100vw - 2*var(--gutter)));
}

body{background:var(--paper)}

.masthead{position:fixed;top:0;left:0;right:0;z-index:30;
  display:flex;align-items:center;justify-content:space-between;gap:20px;
  padding:18px var(--gutter);height:66px;
  background:linear-gradient(var(--paper) 62%,transparent)}
.wordmark{font-family:var(--sans);font-size:14px;letter-spacing:0;text-decoration:none;color:var(--muted);transition:color .25s var(--ease)}
.wordmark:hover{color:var(--ink)}
.masthead nav{display:flex;gap:22px}
.masthead nav a{font-family:var(--sans);font-size:14px;letter-spacing:0;text-decoration:none;
  color:var(--muted);transition:color .25s var(--ease)}
.masthead nav a:hover{color:var(--ink)}

.roll{width:var(--film-w);margin:0 auto;position:relative;padding-block:96px 120px}

/* The two sprocket margins run the entire length of the roll. */
.roll::before,.roll::after{content:"";position:absolute;top:0;bottom:0;width:var(--rail);
  background:#000 repeat-y center top/26px 64px
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='26' height='64'%3E%3Crect x='1' y='18' width='24' height='28' rx='3' fill='%230d0d0d' stroke='%23191919' stroke-width='.8'/%3E%3C/svg%3E");
  pointer-events:none;z-index:1}
.roll::before{left:0}
.roll::after{right:0}

.opening{padding:14vh var(--rail) 10vh;position:relative;z-index:2}
.opening h1{font-family:var(--display);font-weight:400;font-size:clamp(42px,11vw,92px);line-height:.94;
  margin:0 0 22px;text-transform:uppercase;letter-spacing:-.028em}
.opening h1 span{display:block}
.opening p{margin:0;color:var(--muted);max-width:36ch;font-size:clamp(15px,3.6vw,18px);line-height:1.45}

.chapter{padding:56px var(--rail) 22px;position:relative;z-index:2}
.chapter h2{font-family:var(--display);font-weight:400;font-size:clamp(24px,5.4vw,38px);line-height:1;margin:0 0 12px;
  text-transform:uppercase;letter-spacing:-.022em;border-left:1px solid var(--line);padding-left:16px}
.chapter dl{display:flex;flex-wrap:wrap;gap:4px 22px;margin:0;padding-left:16px;
  font-family:var(--mono);font-size:10px;letter-spacing:.12em;text-transform:uppercase;color:var(--muted)}
.chapter dt{color:var(--dim)}
.chapter dd{margin:0}

.frame{position:relative;margin:0 var(--rail) var(--gap);z-index:2}
.frame-img{position:relative;background:var(--shade,#141416) center/cover no-repeat;overflow:hidden}
.frame-img img{width:100%;height:100%;display:block;opacity:0;transition:opacity .55s var(--ease)}
.frame-img img.is-loaded{opacity:1}
.frame button.frame-hit{position:absolute;inset:0;z-index:3;width:100%}
.frame button.frame-hit::after{content:"";position:absolute;inset:0;border:1px solid transparent;transition:border-color .2s var(--ease)}
.frame button.frame-hit:hover::after,.frame button.frame-hit:focus-visible::after{border-color:var(--accent)}
/* Edge printing sits out on the sprocket margin, reading bottom-up like a real stock. */
.frame .code{position:absolute;top:0;left:calc(-1*var(--rail));width:var(--rail);height:100%;
  display:flex;align-items:center;justify-content:center;z-index:4;pointer-events:none;
  font-family:var(--mono);font-size:9px;letter-spacing:.14em;color:#8a7a52;
  writing-mode:vertical-rl;transform:rotate(180deg)}

.closing{padding:12vh var(--rail) 6vh;position:relative;z-index:2;display:flex;flex-direction:column;gap:16px}
.closing h2{font-family:var(--display);font-weight:400;font-size:clamp(28px,7vw,50px);margin:0;
  text-transform:uppercase;line-height:1;letter-spacing:-.024em}
.closing a.contact{font-size:clamp(17px,4vw,24px);text-decoration:none;border-bottom:1px solid var(--line);
  align-self:flex-start;padding-bottom:3px}
.closing a.contact:hover{border-color:var(--ink)}

.readout{position:fixed;left:0;right:0;bottom:0;z-index:30;display:flex;align-items:center;
  justify-content:space-between;gap:16px;padding:14px var(--gutter) 18px;
  background:linear-gradient(transparent,var(--paper) 52%)}
.now{display:flex;align-items:baseline;gap:12px;min-width:0}
.now-code{font-family:var(--mono);font-size:10px;letter-spacing:.2em;text-transform:uppercase;color:var(--dim)}
.now-title{font-family:var(--display);font-weight:400;font-size:clamp(13px,3.2vw,17px);text-transform:uppercase;letter-spacing:-.01em;
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.progress{height:1px;width:min(280px,34vw);background:var(--line);position:relative;flex:none}
.progress i{position:absolute;inset:0 auto 0 0;background:var(--ink);width:var(--p,0%)}

@media (max-width:640px){
  :root{--rail:34px;--gap:11px;--gutter:12px}
  .roll::before,.roll::after{background-size:17px 42px}
  .frame .code{font-size:7px;letter-spacing:.1em}
}