:root {
  /* Typography compliance note: Roboto Slab* Slab** in ExtraBold for `showa.day` */
  --cream: #F6EAD2;
  --green: #1F3A2E;
  --umber: #4A2618;
  --paper: #E8D6B4;
  --brass: #A87532;
  --lacquer: #C45A2A;
  --plum: #2A1B24;
  --display: "Roboto Slab", Roboto, Georgia, serif;
  --serif: "Noto Serif JP", Lora, Georgia, serif;
  --utility: "BIZ UDPGothic", Inter, Roboto, Arial, sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--umber);
  background: var(--plum);
  font-family: var(--serif);
  overflow-x: hidden;
}

button { font: inherit; color: inherit; }

.grain {
  position: fixed;
  inset: 0;
  z-index: 100;
  pointer-events: none;
  opacity: .42;
  mix-blend-mode: multiply;
  background-image:
    radial-gradient(circle at 12% 18%, rgba(74,38,24,.26) 0 1px, transparent 1px),
    radial-gradient(circle at 79% 33%, rgba(31,58,46,.18) 0 1px, transparent 1px),
    radial-gradient(circle at 42% 76%, rgba(168,117,50,.22) 0 1px, transparent 1px),
    linear-gradient(115deg, rgba(246,234,210,.08), rgba(42,27,36,.18));
  background-size: 21px 19px, 17px 23px, 29px 31px, 100% 100%;
}

.archive-shell {
  min-height: 100vh;
  background:
    radial-gradient(circle at 14% 5%, rgba(196,90,42,.25), transparent 22rem),
    radial-gradient(circle at 95% 35%, rgba(31,58,46,.45), transparent 28rem),
    linear-gradient(135deg, var(--umber), var(--plum) 78%);
}

.opening {
  min-height: 100vh;
  position: relative;
  display: grid;
  place-items: center;
  padding: 7vw;
  overflow: hidden;
}

.leather-field {
  background:
    linear-gradient(38deg, rgba(255,255,255,.035), transparent 18%, rgba(0,0,0,.12) 47%, transparent 72%),
    repeating-linear-gradient(104deg, rgba(232,214,180,.025) 0 2px, rgba(74,38,24,.05) 2px 5px),
    radial-gradient(circle at 22% 28%, #65331f, var(--umber) 43%, var(--plum));
}

.stitched-frame {
  position: absolute;
  inset: 3vw;
  border: 2px dashed rgba(232,214,180,.2);
  border-radius: 2.3rem;
  box-shadow: inset 0 0 0 1px rgba(42,27,36,.55), inset 0 0 80px rgba(0,0,0,.3);
}

.calendar-tab {
  position: absolute;
  top: 0;
  right: clamp(2rem, 10vw, 9rem);
  width: 9rem;
  height: 6.2rem;
  display: grid;
  place-items: end center;
  padding-bottom: 1.05rem;
  color: var(--plum);
  background: linear-gradient(100deg, #7a501f, var(--brass) 45%, #e2b86c 52%, var(--brass) 61%, #6e451a);
  border-radius: 0 0 1.2rem 1.2rem;
  font: 800 2.6rem/1 var(--display);
  box-shadow: 0 1.3rem 2rem rgba(0,0,0,.32), inset 0 -1rem 1.4rem rgba(74,38,24,.28);
  overflow: hidden;
}

.calendar-tab::after {
  content: "";
  position: absolute;
  inset: -30% auto -30% -80%;
  width: 3rem;
  transform: rotate(18deg);
  background: rgba(246,234,210,.58);
  filter: blur(8px);
  animation: glint 5.8s ease-in-out infinite;
}

.brand-emboss { text-align: left; width: min(78vw, 980px); transform: rotate(-1.5deg); }

.drawer-note {
  margin: 0 0 1rem .5rem;
  color: rgba(232,214,180,.72);
  font-family: var(--utility);
  letter-spacing: .08em;
  text-transform: uppercase;
}

h1, h2, h3 {
  font-family: var(--display);
  margin: 0;
  letter-spacing: -.055em;
  line-height: .88;
}

h1 {
  color: transparent;
  font-size: clamp(5rem, 16vw, 15rem);
  text-shadow: 0 -2px 1px rgba(246,234,210,.16), 0 4px 4px rgba(0,0,0,.52), 0 0 1px #140c10;
  -webkit-text-stroke: 1px rgba(232,214,180,.13);
}

.receipt-edge {
  position: absolute;
  left: clamp(2rem, 8vw, 7rem);
  bottom: -2.2rem;
  width: 19rem;
  height: 8rem;
  border: 0;
  padding: 1.3rem 1.6rem;
  text-align: left;
  cursor: pointer;
  background:
    linear-gradient(90deg, transparent 0 8px, rgba(74,38,24,.08) 8px),
    repeating-linear-gradient(90deg, transparent 0 12px, rgba(74,38,24,.12) 12px 13px),
    var(--paper);
  box-shadow: 0 -1.2rem 2.2rem rgba(0,0,0,.32);
  transform: rotate(2deg) translateY(3rem);
  transition: transform .75s cubic-bezier(.2,.8,.18,1);
}

.receipt-edge.peek, .receipt-edge:hover { transform: rotate(1deg) translateY(0); }
.receipt-edge span, .object-label, .stamp, .chapter-kicker { font-family: var(--utility); text-transform: uppercase; letter-spacing: .08em; }
.receipt-edge span { display: block; font-size: .74rem; color: var(--brass); }
.receipt-edge b { display: block; margin-top: .5rem; font: 800 1.6rem/1 var(--display); color: var(--umber); }

.tea-ring { position: absolute; border: .75rem solid rgba(168,117,50,.16); border-radius: 50%; filter: blur(.3px); }
.ring-one { width: 10rem; height: 10rem; left: 16%; top: 22%; }
.ring-two { width: 7rem; height: 7rem; right: 19%; bottom: 16%; border-color: rgba(232,214,180,.12); }

.chapter-tabs {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  gap: .5rem;
  padding: .8rem clamp(1rem, 4vw, 3rem);
  background: rgba(42,27,36,.72);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(168,117,50,.38);
}

.chapter-tabs button {
  border: 1px solid rgba(168,117,50,.55);
  background: rgba(232,214,180,.08);
  color: var(--paper);
  border-radius: 999px;
  padding: .65rem .9rem;
  font: 700 .72rem/1 var(--utility);
  letter-spacing: .07em;
  text-transform: uppercase;
  cursor: pointer;
  transition: background .25s ease, color .25s ease, transform .25s ease;
}
.chapter-tabs button.active, .chapter-tabs button:hover { background: var(--brass); color: var(--plum); transform: translateY(-2px); }

.chapter { min-height: 100vh; padding: clamp(1.1rem, 3vw, 3rem); }
.chapter-field {
  min-height: 42vh;
  margin: 0 auto clamp(1rem, 3vw, 2rem);
  padding: clamp(1.5rem, 5vw, 4rem);
  border-radius: 2rem;
  position: relative;
  box-shadow: 0 2rem 4rem rgba(0,0,0,.28), inset 0 0 0 1px rgba(255,255,255,.18);
  overflow: hidden;
}
.chapter-field::before {
  content: attr(data-label);
  position: absolute;
  inset: auto 2rem 1.2rem auto;
  width: 5rem;
  height: 5rem;
  border-radius: 50%;
  border: 3px double rgba(196,90,42,.55);
}
.paper-field { background: linear-gradient(120deg, rgba(246,234,210,.8), rgba(232,214,180,.93)), var(--paper); }
.marble-field, .marble, .narrow {
  background:
    radial-gradient(ellipse at 20% 10%, rgba(31,58,46,.22), transparent 18rem),
    linear-gradient(128deg, transparent 0 24%, rgba(74,38,24,.18) 24.5% 25.4%, transparent 26%),
    linear-gradient(35deg, transparent 0 46%, rgba(31,58,46,.17) 46.4% 47.2%, transparent 48%),
    var(--cream);
}
.lacquer-field { background: linear-gradient(135deg, var(--paper), #d5ac76 47%, var(--lacquer)); }
.night-field { background: radial-gradient(circle at 18% 15%, rgba(168,117,50,.35), transparent 18rem), linear-gradient(130deg, var(--green), var(--plum) 75%); color: var(--paper); }

.chapter-kicker { color: var(--brass); font-size: .78rem; margin: 0 0 1rem; }
.chapter h2 { font-size: clamp(3.2rem, 9vw, 8.5rem); color: var(--umber); }
.train .chapter h2, .night-field h2 { color: var(--cream); }
.chapter-copy { max-width: 42rem; font-size: clamp(1rem, 1.9vw, 1.38rem); line-height: 1.65; }

.masonry-table {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  grid-auto-rows: 6.5rem;
  gap: clamp(.9rem, 1.8vw, 1.45rem);
  align-items: stretch;
}

.artifact {
  position: relative;
  min-height: 12rem;
  padding: 1.25rem;
  border: 0;
  color: var(--umber);
  box-shadow: 0 1.5rem 2.5rem rgba(0,0,0,.26), inset 0 0 0 1px rgba(74,38,24,.12);
  transform: translateY(3rem) rotate(var(--tilt, -1deg));
  opacity: 0;
  overflow: hidden;
  transition: opacity .7s ease, transform .85s cubic-bezier(.2,.8,.18,1), box-shadow .35s ease;
}
.artifact.is-visible { opacity: 1; transform: translateY(0) rotate(var(--tilt, -1deg)); }
.artifact.is-open { box-shadow: 0 2rem 3.5rem rgba(0,0,0,.34), inset 0 0 0 2px rgba(196,90,42,.35); }
.artifact::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 20% 30%, rgba(74,38,24,.08), transparent 7rem), radial-gradient(circle at 70% 75%, rgba(168,117,50,.12), transparent 8rem);
  pointer-events: none;
  mix-blend-mode: multiply;
}
.artifact h3 { font-size: clamp(1.55rem, 2.6vw, 3rem); margin-top: .8rem; position: relative; z-index: 1; }
.caption { position: relative; z-index: 1; max-height: 0; opacity: 0; margin: .75rem 0 0; line-height: 1.55; transition: max-height .55s ease, opacity .45s ease; }
.artifact.is-open .caption, .artifact:hover .caption { max-height: 12rem; opacity: 1; }
.stamp { position: relative; z-index: 1; display: inline-block; color: var(--lacquer); border: 2px solid currentColor; border-radius: .2rem; padding: .25rem .42rem; font-size: .7rem; transform: rotate(-4deg); }
.object-label { position: absolute; z-index: 2; left: 1rem; bottom: 1rem; border: 1px solid rgba(74,38,24,.28); background: rgba(246,234,210,.72); padding: .45rem .62rem; border-radius: 999px; font-size: .68rem; cursor: pointer; }

.tall { grid-row: span 4; }
.wide { grid-column: span 2; grid-row: span 3; }
.skinny { grid-row: span 3; }
.square { grid-row: span 3; }
.round { grid-row: span 3; border-radius: 50%; display: flex; flex-direction: column; justify-content: center; }
.narrow { grid-row: span 4; }
.ticket { background: linear-gradient(90deg, transparent 0 10px, rgba(74,38,24,.08) 10px), repeating-linear-gradient(180deg, transparent 0 23px, rgba(74,38,24,.1) 24px), var(--paper); clip-path: polygon(0 0, 100% 0, 100% 92%, 92% 100%, 0 100%); }
.receipt { background: repeating-linear-gradient(90deg, rgba(74,38,24,.08) 0 1px, transparent 1px 14px), var(--paper); clip-path: polygon(4% 0, 96% 0, 100% 96%, 91% 100%, 78% 96%, 65% 100%, 52% 96%, 39% 100%, 25% 96%, 13% 100%, 0 96%); }
.coaster { background: radial-gradient(circle, rgba(168,117,50,.15) 0 34%, transparent 35%), linear-gradient(135deg, #6f2f1b, var(--umber)); color: var(--paper); border-radius: 1.1rem; }
.ashtray { background: radial-gradient(circle, #d3a65a, var(--brass) 52%, #6f4519); }
.matchbook { background: linear-gradient(90deg, var(--lacquer) 0 28%, var(--paper) 28%); transform-origin: left center; }
.green { background: linear-gradient(145deg, #294b3c, var(--green)); color: var(--cream); }
.notebook { background: linear-gradient(180deg, rgba(31,58,46,.16) 0 2px, transparent 2px 28px), var(--cream); grid-column: span 2; grid-row: span 2; }
.calendar { background: linear-gradient(var(--paper) 0 22%, var(--cream) 22%); }
.bath-tile { background: linear-gradient(45deg, rgba(31,58,46,.22) 25%, transparent 25% 75%, rgba(31,58,46,.22) 75%), var(--cream); background-size: 4rem 4rem; }
.dial { background: radial-gradient(circle, var(--cream) 0 28%, var(--brass) 29% 35%, var(--paper) 36%); }
.leather-cover { background: linear-gradient(135deg, #5a2b1b, var(--umber), var(--plum)); color: var(--paper); }
.final-ticket { grid-column: span 2; background: linear-gradient(90deg, transparent 0 12px, rgba(168,117,50,.1) 12px), var(--green); color: var(--cream); }
.punch-mark { position: absolute; right: 22%; top: 32%; width: 1.1rem; height: 1.1rem; border-radius: 50%; background: var(--plum); box-shadow: 0 0 0 0 rgba(168,117,50,.7); }
.artifact.is-open .punch-mark { animation: punch 1.05s ease-in-out infinite; }

.ticket { --tilt: -2.2deg; }
.marble { --tilt: 1.2deg; }
.receipt { --tilt: 2.4deg; }
.coaster { --tilt: -3deg; }
.sign { --tilt: .8deg; }
.notebook { --tilt: -1deg; }
.dial { --tilt: 2deg; }

@keyframes glint { 0%, 38% { left: -80%; } 58%, 100% { left: 140%; } }
@keyframes punch { 0%, 100% { box-shadow: 0 0 0 0 rgba(168,117,50,.75); transform: scale(1); } 45% { box-shadow: 0 0 0 1.3rem rgba(168,117,50,0); transform: scale(.78); } }

@media (max-width: 900px) {
  .chapter-tabs { overflow-x: auto; }
  .masonry-table { grid-template-columns: repeat(2, minmax(0, 1fr)); grid-auto-rows: 6rem; }
  .wide, .notebook, .final-ticket { grid-column: span 2; }
}

@media (max-width: 560px) {
  .opening { padding: 1rem; }
  .calendar-tab { right: 1.2rem; width: 6.7rem; height: 5.2rem; font-size: 2rem; }
  .drawer-note { font-size: .72rem; }
  .receipt-edge { left: 1rem; width: 16rem; }
  .chapter { padding: .75rem; }
  .masonry-table { display: block; }
  .artifact { margin: 1rem 0; min-height: 16rem; }
  .round { border-radius: 1.4rem; }
}