/* 045 HAKUBOKU ― 色はここだけ触れば差し替わる */
:root {
  --c-bg: #f4f4f2;
  --c-grey: #d9d9d6;
  --c-ink: #111111;
  --c-accent: #8a8a86;
  --c-accent-text: #4b4b4b;
  --c-text: #374151;
  --c-sub: #4b5563;
  --duo-dark: #111111;
  --duo-light: #c9c7c0;
  --font: "Noto Sans JP", sans-serif;
  --font-ja: "Zen Old Mincho", serif;
  --font-en: "Italiana", serif;
  --font-num: "Bodoni Moda", serif;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; font-family: var(--font); font-size: 16px; line-height: 2; letter-spacing: .04em; color: var(--c-text); background: var(--c-bg); overflow-x: hidden; }
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; }
h1, h2, h3, p, figure, dl, dd { margin: 0; font-weight: inherit; }
ul { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, p, dd, li { word-break: auto-phrase; }

.label { font-family: var(--font-en); font-size: 18px; letter-spacing: .32em; text-transform: uppercase; color: var(--c-accent-text); margin-bottom: 16px; }
.h2 { font-family: var(--font-ja); font-weight: 700; font-size: clamp(26px, 3.6vw, 40px); line-height: 1.6; letter-spacing: .08em; color: var(--c-ink); margin-bottom: 28px; }
.vtitle { writing-mode: vertical-rl; font-family: var(--font-ja); font-weight: 700; font-size: clamp(26px, 3vw, 40px); line-height: 1.8; letter-spacing: .16em; }

.btn { display: inline-flex; align-items: center; justify-content: center; min-height: 48px; padding: 0 26px; text-decoration: none; letter-spacing: .12em; white-space: nowrap; flex: none; transition: background-color .3s, color .3s; }
.btn--ink { background: var(--c-ink); color: #fff; }
.btn--ink:hover { background: #3a3a3a; }
.btn--white { background: #fff; color: var(--c-ink); }
.btn--white:hover { background: var(--c-grey); }
.btn--lg { min-height: 64px; padding: 0 56px; font-size: 17px; }

/* 二色刷り（墨×灰）。乗せると元の白黒に戻る */
.duo { position: relative; overflow: hidden; background: var(--duo-light); }
.duo img { width: 100%; height: 100%; object-fit: cover; filter: grayscale(1) contrast(1.2); mix-blend-mode: multiply; transition: filter .6s, mix-blend-mode .6s; }
.duo::after { content: ""; position: absolute; inset: 0; background: var(--duo-dark); mix-blend-mode: lighten; pointer-events: none; transition: opacity .6s; }

/* ヘッダー */
.header { position: fixed; top: 0; left: 0; right: 0; z-index: 50; background: rgba(244, 244, 242, .92); border-bottom: 1px solid var(--c-grey); }
.header__inner { display: flex; align-items: center; gap: 16px; height: 64px; padding: 0 12px 0 20px; max-width: 1440px; margin: 0 auto; }
.logo { display: flex; align-items: center; min-height: 48px; font-family: var(--font-en); font-size: 24px; letter-spacing: .3em; color: var(--c-ink); text-decoration: none; white-space: nowrap; flex: none; }
.gnav { display: none; }
.header__btn { margin-left: auto; min-height: 44px; padding: 0 16px; font-size: 15px; }
@media (max-width: 420px) { .logo { font-size: 20px; letter-spacing: .2em; } .header__btn { padding: 0 12px; letter-spacing: .04em; } }
@media (min-width: 1080px) {
  .header__inner { height: 80px; padding: 0 40px; gap: 36px; }
  .gnav { display: flex; gap: 32px; margin-left: auto; }
  .gnav a { display: flex; align-items: center; min-height: 44px; font-family: var(--font-en); font-size: 17px; letter-spacing: .2em; text-decoration: none; color: var(--c-ink); }
  .gnav a:hover { text-decoration: underline; text-underline-offset: 6px; }
  .header__btn { margin-left: 0; padding: 0 24px; }
}
.spmenu { flex: none; }
.spmenu summary { list-style: none; cursor: pointer; display: flex; align-items: center; justify-content: center; width: 48px; height: 48px; color: var(--c-ink); }
.spmenu summary::-webkit-details-marker { display: none; }
.spmenu__label { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.spmenu__bar, .spmenu__bar::before, .spmenu__bar::after { display: block; width: 22px; height: 1.5px; background: currentColor; position: relative; }
.spmenu__bar::before, .spmenu__bar::after { content: ""; position: absolute; left: 0; }
.spmenu__bar::before { top: -7px; } .spmenu__bar::after { top: 7px; }
.spmenu[open] .spmenu__bar { background: transparent; }
.spmenu[open] .spmenu__bar::before { top: 0; transform: rotate(45deg); }
.spmenu[open] .spmenu__bar::after { top: 0; transform: rotate(-45deg); }
.spmenu__nav { position: absolute; left: 0; right: 0; top: 100%; background: var(--c-bg); padding: 8px 20px 24px; display: flex; flex-direction: column; border-bottom: 1px solid var(--c-grey); }
.spmenu__nav a { display: flex; align-items: baseline; justify-content: space-between; gap: 16px; min-height: 56px; padding-top: 14px; font-family: var(--font-en); font-size: 22px; letter-spacing: .14em; color: var(--c-ink); text-decoration: none; border-bottom: 1px solid var(--c-grey); }
.spmenu__nav small { font-family: var(--font); font-size: 15px; letter-spacing: .06em; color: var(--c-sub); }
@media (min-width: 1080px) { .spmenu { display: none; } }

/* ===== 演出① A07：縦3枚の写真 ===== */
.hero { position: relative; height: 100svh; min-height: 600px; padding-top: 64px; background: var(--c-bg); overflow: hidden; }
.hero__slices { display: grid; grid-template-columns: repeat(3, 1fr); gap: 6px; height: 100%; }
.slice { overflow: hidden; background: var(--c-grey); }
.slice img { width: 100%; height: 100%; object-fit: cover; transform-origin: 50% 40%; }
.hero__copy { position: absolute; z-index: 2; top: calc(50% + 32px); left: 50%; transform: translate(-50%, -50%); display: flex; flex-direction: row-reverse; align-items: flex-end; gap: 14px; background: rgba(244, 244, 242, .94); padding: 28px 20px; }
.hero__title { writing-mode: vertical-rl; font-family: var(--font-ja); font-weight: 500; font-size: clamp(28px, 4.2vw, 52px); line-height: 1.7; letter-spacing: .24em; color: var(--c-ink); }
.hero__season { writing-mode: vertical-rl; font-family: var(--font-en); font-size: 15px; letter-spacing: .3em; color: var(--c-accent-text); }
@media (min-width: 1080px) {
  .hero { padding-top: 80px; }
  .hero__slices { gap: 10px; padding: 10px; }
  .hero__copy { top: calc(50% + 40px); padding: 48px 36px; gap: 20px; }
}

/* ===== 演出② F05：数字の穴 ===== */
.concept { padding: 96px 20px; }
.concept__inner { max-width: 1200px; margin: 0 auto; display: grid; gap: 24px; align-items: center; }
.concept__num {
  font-family: var(--font-num); font-weight: 800; font-size: clamp(200px, 62vw, 520px); line-height: .85; letter-spacing: -.04em; text-align: center;
  color: var(--c-ink); /* 写真が読めなかったときの色 */
  background: var(--duo-light) url(images/fabric.webp) 50% 50% / cover;
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
  filter: grayscale(1) contrast(1.25);
}
.concept__body p + p { margin-top: 18px; }
@media (min-width: 900px) {
  .concept { padding: 160px 48px; }
  .concept__inner { grid-template-columns: 1.1fr 1fr; gap: 64px; }
  .concept__num { font-size: clamp(300px, 36vw, 560px); }
}

/* ===== 演出③ C05：雑誌の見開き ===== */
.look { --paper: #fff; --ink: var(--c-ink); --body: var(--c-text); background: var(--c-ink); overflow: hidden; }
.look__viewport { overflow-x: auto; scroll-snap-type: x mandatory; -webkit-overflow-scrolling: touch; }
.look__track { display: flex; width: max-content; }
.spread { display: grid; grid-template-rows: auto 1fr; width: 88vw; min-height: 100svh; scroll-snap-align: start; background: var(--paper); color: var(--body); }
.spread--white { --paper: #ffffff; }
.spread--grey { --paper: var(--c-grey); }
.spread--black { --paper: #161616; --ink: #ffffff; --body: #e5e5e2; }
.spread--cover { --paper: var(--c-bg); width: 72vw; }
.page { position: relative; }
.page--photo { height: 58svh; }
.page--text { display: flex; flex-direction: row-reverse; justify-content: flex-start; align-items: flex-start; gap: 24px; padding: 28px 20px 36px; }
.page--text .vtitle { color: var(--ink); }
.spread__no { writing-mode: horizontal-tb; font-family: var(--font-num); font-weight: 800; font-size: 40px; line-height: 1; color: var(--ink); }
.spread__items { writing-mode: vertical-rl; font-size: 15px; line-height: 2.1; color: var(--body); letter-spacing: .1em; }
.spread__items li:last-child { margin-right: 12px; }
.page--cover { grid-row: 1 / -1; display: flex; flex-direction: column; justify-content: center; padding: 96px 24px 48px; }
.cover__title { font-family: var(--font-num); font-weight: 800; font-size: clamp(64px, 18vw, 200px); line-height: .95; color: var(--c-ink); margin: 8px 0 24px; }
.cover__title small { display: block; font-family: var(--font-en); font-weight: 400; font-size: clamp(20px, 2vw, 28px); letter-spacing: .3em; margin-top: 16px; }
.cover__note { font-family: var(--font-ja); font-size: 18px; color: var(--c-ink); }
.cover__hint { font-size: 32px; color: var(--c-ink); margin-top: 24px; }
.spread--black .page--photo { --duo-light: #8f8d87; }

@media (min-width: 1080px) {
  .look__viewport { overflow: hidden; scroll-snap-type: none; }
  .spread { grid-template-rows: none; grid-template-columns: 1fr 1fr; width: 100vw; height: 100vh; min-height: 640px; }
  .spread--cover { width: 50vw; grid-template-columns: 1fr; }
  .page--photo { height: auto; margin: 120px 0 56px 72px; }
  .page--text { padding: 40px 72px 40px; gap: 48px; border-left: 1px solid rgba(128, 128, 128, .35); margin: 120px 0 56px 48px; }
  .spread__no { font-size: 64px; }
  .vtitle { font-size: clamp(32px, 3vw, 48px); }
  .page--cover { padding: 120px 8vw; }
}
@media (max-width: 1079px) {
  /* スマホは「横に送れる」ことが見て分かるよう、右の見開きを少しのぞかせる */
  .look__track { padding-right: 12vw; }
}

/* ===== 素材 ===== */
.material { padding: 96px 20px; max-width: 1280px; margin: 0 auto; display: grid; gap: 40px; }
.material__photo { aspect-ratio: 3 / 2; }
.mats div { padding: 18px 0; border-top: 1px solid var(--c-grey); }
.mats dt { font-family: var(--font-ja); font-weight: 700; font-size: 19px; color: var(--c-ink); }
@media (min-width: 900px) { .material { grid-template-columns: 1.2fr 1fr; gap: 72px; padding: 160px 48px; align-items: center; } }

/* ===== アイテム ===== */
.items { padding: 0 20px 96px; max-width: 1280px; margin: 0 auto; }
.items__head { margin-bottom: 40px; }
.items__lead { color: var(--c-sub); }
.items__list { display: grid; grid-template-columns: 1fr 1fr; gap: 32px 16px; }
.item figure { aspect-ratio: 3 / 4; margin-bottom: 14px; }
.item h3 { font-family: var(--font-ja); font-weight: 700; font-size: 17px; color: var(--c-ink); line-height: 1.6; }
.item p { font-size: 15px; color: var(--c-sub); }
.item:hover .duo img { filter: grayscale(1); mix-blend-mode: normal; }
.item:hover .duo::after { opacity: 0; }
@media (min-width: 900px) { .items { padding: 0 48px 160px; } .items__list { grid-template-columns: repeat(4, 1fr); gap: 32px; } }

/* ===== アトリエ ===== */
.atelier { background: #fff; padding: 0 0 96px; }
.atelier__photo img { width: 100%; height: 56vh; min-height: 300px; object-fit: cover; filter: grayscale(1); }
.atelier__body { padding: 48px 20px 0; max-width: 720px; }
.info { margin-top: 28px; }
.info div { display: grid; grid-template-columns: 4.5em 1fr; gap: 16px; padding: 14px 0; border-bottom: 1px solid var(--c-grey); }
.info dt { font-family: var(--font-ja); font-weight: 700; color: var(--c-ink); }
@media (min-width: 900px) {
  .atelier { display: grid; grid-template-columns: 1.2fr 1fr; align-items: center; padding: 0; }
  .atelier__photo img { height: 100%; min-height: 640px; }
  .atelier__body { padding: 96px 72px; }
}

/* ===== オンラインストア ===== */
.store { position: relative; background: var(--c-ink); color: #e5e5e2; text-align: center; padding: 120px 20px; overflow: hidden; }
.store__big { position: absolute; left: 50%; top: 50%; transform: translate(-50%, -50%); font-family: var(--font-en); font-size: 22vw; letter-spacing: .1em; color: #262626; white-space: nowrap; pointer-events: none; }
.store > *:not(.store__big) { position: relative; }
.store__title { font-family: var(--font-ja); font-weight: 700; font-size: clamp(28px, 4vw, 44px); color: #fff; letter-spacing: .2em; margin-bottom: 16px; }
.store .btn { margin-top: 36px; }

/* ===== フッター ===== */
.footer { background: var(--c-bg); padding: 64px 20px 32px; text-align: center; font-size: 15px; color: var(--c-sub); }
.footer__logo { font-family: var(--font-en); font-size: 30px; letter-spacing: .3em; color: var(--c-ink); }
.footer__nav { display: flex; flex-wrap: wrap; justify-content: center; gap: 0 24px; margin: 20px 0; }
.footer__nav a { display: flex; align-items: center; min-height: 44px; text-decoration: none; font-family: var(--font-en); font-size: 17px; letter-spacing: .14em; color: var(--c-ink); }
.footer__fiction { margin-top: 20px; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}