/* =========================================================
   Top page — Proposal B "Folio Grid"
   12 columns / outer 64 / gutter 24
   ========================================================= */

/* 共通トークン・ヘッダー・フッター・スキップリンクは site.css に集約 */

html,
body { background: var(--ink); }   /* トップは黒で始まり黒で閉じる */

/* ---------- base ---------- */
.paper-home {
  color: var(--text);
  background: var(--kinari);
  font-family: var(--sans);
  font-size: 1rem;
  line-height: 1.85;
  max-width: none;
  margin-inline: 0;
}

.paper-home p,
.paper-home h1,
.paper-home h2 {
  word-break: auto-phrase;
  text-wrap: pretty;
}

.paper-home .hero h1,
.paper-home .folio-copy h2,
.paper-home .principle h2 {
  margin: 0;
  font-family: var(--mincho);
  font-weight: 500;
  font-feature-settings: "palt" 1;
  letter-spacing: 0;
}

.paper-home .folio-copy h2,
.paper-home .principle h2 { letter-spacing: -.01em; }

/* =========================================================
   Hero
   ========================================================= */
.paper-home .hero {
  --paper: min(40rem, 46vw);           /* 紙の幅（写真は 16:9 なので横長の紙） */
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) var(--paper);
  align-items: center;
  height: 37.5rem;
  margin-top: var(--header-h);
  padding-inline: var(--wrap);
  overflow: hidden;
  color: var(--kinari);
  background: var(--ink);
  isolation: isolate;
}

.paper-home .hero-copy {
  position: relative;
  z-index: 3;
  grid-area: 1 / 1;
  margin-right: -1.5rem;               /* h1 2行目を紙の左端に24px掛ける */
  pointer-events: none;
}

.paper-home .hero h1 {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  color: var(--ink);
  font-size: clamp(2.375rem, 4.45vw, 4rem);
  line-height: 1.2;
}

.paper-home .hero h1::before {
  margin: 0 0 1.5rem;
  color: var(--kinari);
  font-family: var(--bodoni);
  font-size: .75rem;
  font-weight: 500;
  line-height: 1;
  letter-spacing: .24em;
  content: "PAPER / MODEL / EXPERIENCE";
}

.paper-home .hero h1 span {
  display: block;
  padding: .06em .22em .1em .16em;
  border: 1px solid var(--ink);        /* 黒地では消え、紙の上でだけ紙端の線になる */
  background: var(--kinari);
  white-space: nowrap;
}

.paper-home .hero h1 span + span {
  align-self: flex-end;
  margin-top: -1px;
}

.paper-home .hero-copy p {
  max-width: min(25rem, calc(100% - 3rem));   /* 紙（裏紙を含む）に掛からない幅で折り返す */
  margin: 2.25rem 0 0 .25rem;
  color: rgba(243, 241, 234, .82);
  font-size: 1rem;
  line-height: 1.9;
}

.paper-home .hero-copy p span { display: inline-block; }

.paper-home .hero-composition {
  position: relative;
  z-index: 1;
  grid-area: 1 / 2;
  width: var(--paper);
}

.paper-home .paper {
  position: absolute;
  inset: 0;
  border: 1px solid var(--ink);
  background: var(--paper-white);
}

.paper-home .paper-back {
  border-color: rgba(17, 17, 16, .9);
  background: #e9e7df;
  transform: translate(-1rem, 1rem);
}

.paper-home .paper-cut { z-index: 1; }

/* 写真：紙の余白の内側に 16:9。比率の違う写真は中央を基準に切り取る（紙の高さは写真に合わせて決まる） */
.paper-home .hero-image {
  position: relative;
  z-index: 2;
  margin: clamp(1rem, 1.9vw, 1.75rem);
  overflow: hidden;
  aspect-ratio: 16 / 9;
}

.paper-home .hero-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  background: var(--paper-white);
}

/* 事業（Business）は css/home-folio.css */

.paper-home .principle-cta-button span { transition: transform .25s ease; }
.paper-home .principle-cta-button:hover span { transform: translateX(.25rem); }

/* =========================================================
   Principle — 黒の「閉じ」（フッターと一続き）
   ========================================================= */
.paper-home .principle {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  column-gap: var(--cg);
  align-items: end;
  width: 100%;
  margin: 0;
  padding: 5.5rem var(--wrap) 5rem;
  color: var(--kinari);
  border: 0;
  background: var(--ink);
}

.paper-home .principle-heading {
  grid-column: 1 / 9;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.paper-home .principle-label {
  margin: 0 0 1.5rem;
  color: rgba(243, 241, 234, .72);
  font-family: var(--bodoni);
  font-size: .75rem;
  font-weight: 500;
  line-height: 1;
  letter-spacing: .24em;
}

.paper-home .principle h2 {
  font-size: clamp(1.875rem, 3.35vw, 3rem);
  line-height: 1.3;
}

/* 「見せるものも、」「つくる時間も。」は句の途中で折り返さない（幅が足りるPCでは1行） */
.paper-home .principle h2 .nb { display: inline-block; }

.paper-home .principle-action {
  grid-column: 9 / 13;
  padding-bottom: .25rem;
}

.paper-home .principle-action p {
  margin: 0;
  color: rgba(243, 241, 234, .82);
  font-size: .9375rem;
  line-height: 1.9;
}

.paper-home .principle-cta-button {
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  width: min(20rem, 100%);
  margin-top: 1.75rem;
  padding: .9rem 1.25rem;
  color: var(--ink);
  border: 1px solid var(--kinari);
  background: var(--kinari);
  font-size: .9375rem;
  font-weight: 500;
  transition: color .25s ease, background .25s ease;
}

.paper-home .principle-cta-button:hover,
.paper-home .principle-cta-button:focus-visible {
  color: var(--kinari);
  background: transparent;
}

.paper-home .principle-cta-button:focus-visible {
  outline: 2px solid var(--kinari);
  outline-offset: 3px;
}

/* ---------- reveal：0.5秒のフェードのみ ---------- */
.js .paper-home .reveal {
  opacity: 0;
  transform: none;
  transition: opacity .5s ease;
}
.js .paper-home .reveal.is-visible { opacity: 1; }

/* =========================================================
   ≤900：ヒーロー調整
   ========================================================= */
@media (max-width: 900px) {
  .paper-home .hero {
    --paper: min(30rem, 44vw);
    height: 32.5rem;
  }

  .paper-home .principle-heading { grid-column: 1 / -1; }
  .paper-home .principle-action { grid-column: 1 / -1; margin-top: 2rem; }
  .paper-home .principle { padding-block: 4.5rem 4rem; }
  .paper-home .principle-action p { max-width: 34rem; }
}

/* =========================================================
   ≤600：スマートフォン
   ========================================================= */
@media (max-width: 600px) {
  :root { --cg: 1rem; }

  .paper-home .hero {
    --paper: min(26rem, 86vw);
    grid-template-columns: minmax(0, 1fr);
    align-items: start;
    height: auto;
    padding-block: 1.75rem 2.75rem;
  }

  .paper-home .hero-copy {
    grid-area: 1 / 1;
    margin-right: 0;
  }

  .paper-home .hero h1 { font-size: clamp(2rem, 9.6vw, 2.375rem); }
  .paper-home .hero h1::before { margin-bottom: 1rem; font-size: .75rem; letter-spacing: .18em; }
  .paper-home .hero h1 span + span { align-self: flex-start; margin-left: clamp(1rem, 7vw, 2.5rem); }

  .paper-home .hero-copy p {
    max-width: none;
    margin: 1.25rem 0 0;
    font-size: .9375rem;
    line-height: 1.8;
  }

  .paper-home .hero-composition {
    grid-area: 2 / 1;
    justify-self: center;
    margin-top: 1.5rem;
  }

  .paper-home .paper-back { transform: translate(-.75rem, .75rem); }

  .paper-home .principle { padding-block: 3.5rem 3.25rem; }
  .paper-home .principle-label { margin-bottom: 1.125rem; }
  .paper-home .principle-action { margin-top: 1.5rem; }
  .paper-home .principle-cta-button { width: 100%; }

}

@media (prefers-reduced-motion: reduce) {
  .js .paper-home .reveal { opacity: 1; transition: none; }
}