/* ── 金地の屏風。藍と朱を置く。単一の世界に振り切る ────────────── */
:root {
  /* Meiryo UI 優先。無い環境は OS 標準の日本語 UI 書体へ落とす */
  --ui: "Meiryo UI", Meiryo, "Hiragino Kaku Gothic ProN", "Yu Gothic UI", "Yu Gothic", sans-serif;
  --kin:    #E9DCBB;   /* 金地 */
  --kin-2:  #DFCEA6;
  --kin-3:  #D2BE8E;
  --sumi:   #1A1A18;
  --sumi-2: #4A473F;
  --ai:     #1F3A5F;   /* 藍 */
  --ai-2:   #2E5484;
  --shu:    #C1453C;   /* 朱 */
  --fold:   #C9B183;
}
* { box-sizing: border-box; }
body {
  margin: 0; background: var(--kin); color: var(--sumi);
  font-family: var(--ui);
  font-size: 15px; line-height: 1.95; -webkit-font-smoothing: antialiased;
}
html[lang="en"] body { font-family: var(--ui); font-size: 17px; }
html[lang="zh-Hans"] body { font-family: var(--ui); }
h1, h2, h3 { margin: 0; font-family: var(--ui); font-weight: 400; text-wrap: balance; }
html[lang="en"] h1, html[lang="en"] h2, html[lang="en"] h3 { font-family: var(--ui); font-weight: 600; }
html[lang="zh-Hans"] h1, html[lang="zh-Hans"] h2, html[lang="zh-Hans"] h3 { font-family: var(--ui); font-weight: 700; }

.band { background: var(--ai); color: var(--kin); font-size: 11.5px; letter-spacing: .05em; padding: 7px 20px; text-align: center; }

/* ── 上部：屋号と言語 ──────────────────────────────────────── */
.top {
  display: flex; align-items: center; justify-content: space-between; gap: 18px; flex-wrap: wrap;
  padding: 16px clamp(18px, 4vw, 40px); border-bottom: 1px solid var(--kin-3);
}
.name { font-family: var(--ui); font-size: 21px; letter-spacing: .3em; }
.name small { display: block; font-family: var(--ui); font-size: 11px; letter-spacing: .3em; color: var(--sumi-2); }
#langs { display: flex; gap: 0; border: 1px solid var(--sumi); }
#langs button {
  font: inherit; font-size: 12px; padding: 5px 14px; cursor: pointer;
  background: transparent; color: var(--sumi); border: none; border-right: 1px solid var(--sumi);
  letter-spacing: .08em; transition: background .2s, color .2s;
}
#langs button:last-child { border-right: none; }
#langs button[aria-pressed="true"] { background: var(--sumi); color: var(--kin); }

/* ── 屏風：横に繰る ───────────────────────────────────────── */
.screen {
  display: flex; gap: 0;
  overflow-x: auto; overflow-y: hidden;
  scroll-snap-type: x mandatory; scroll-behavior: smooth;
  scrollbar-width: thin;
}
.pane {
  flex: 0 0 min(620px, 86vw);
  scroll-snap-align: center;
  min-height: min(760px, 78vh);
  padding: 44px clamp(24px, 4vw, 52px) 52px;
  border-right: 1px solid var(--fold);
  position: relative;
  display: flex; flex-direction: column;
  background: linear-gradient(100deg, rgba(0,0,0,.045), rgba(0,0,0,0) 14%, rgba(0,0,0,0) 86%, rgba(0,0,0,.05));
}
.pane::after { /* 折り目 */
  content: ""; position: absolute; right: -1px; top: 0; bottom: 0; width: 2px;
  background: linear-gradient(90deg, rgba(255,255,255,.5), rgba(0,0,0,.09));
}
.pane .idx {
  font-family: var(--ui); font-size: 12px; letter-spacing: .3em;
  color: var(--sumi-2); margin: 0 0 18px;
}

/* 現れ方 */
.pane .fx { opacity: 0; transform: translateY(14px); transition: opacity .7s ease, transform .7s cubic-bezier(.2,.8,.3,1); }
.pane.on .fx { opacity: 1; transform: none; }
.pane.on .fx:nth-of-type(2) { transition-delay: .1s; }
.pane.on .fx:nth-of-type(3) { transition-delay: .2s; }
.pane.on .fx:nth-of-type(4) { transition-delay: .3s; }

/* ── 1面：縦書きの表紙 ────────────────────────────────────── */
.cover { align-items: center; justify-content: center; text-align: center; }
.tate { writing-mode: vertical-rl; text-orientation: upright; margin: 0 auto; }
.tate h1 { font-size: clamp(28px, 5vw, 44px); line-height: 1.72; letter-spacing: .2em; }
.tate h1 em { font-style: normal; color: var(--shu); }
html:not([lang="ja"]) .tate { writing-mode: horizontal-tb; }
html:not([lang="ja"]) .tate h1 { letter-spacing: .02em; line-height: 1.28; font-size: clamp(30px, 5vw, 46px); }
.cover .sub { margin: 26px 0 0; color: var(--sumi-2); font-size: 14px; max-width: 34ch; }

/* 和柄 */
.wagara { width: 100%; max-width: 300px; margin: 0 auto 8px; display: block; }
.wagara path, .wagara circle { fill: none; stroke: var(--ai); stroke-width: 1.2; opacity: .55; }
.wagara .d {
  stroke-dasharray: var(--len); stroke-dashoffset: var(--len);
  transition: stroke-dashoffset 2.2s cubic-bezier(.4,0,.2,1);
}
.pane.on .wagara .d { stroke-dashoffset: 0; }

/* ── 中身 ──────────────────────────────────────────────────── */
.pane h2 { font-size: 26px; letter-spacing: .12em; margin-bottom: 6px; }
.pane .lead { color: var(--sumi-2); font-size: 14px; margin: 0 0 22px; }

.list { list-style: none; margin: 0; padding: 0; }
.list li { padding: 15px 0; border-bottom: 1px solid var(--kin-3); }
.list h3 { font-size: 17px; letter-spacing: .08em; margin-bottom: 3px; }
.list p { margin: 0; font-size: 13.5px; color: var(--sumi-2); }

.plans { display: grid; gap: 12px; }
.plan { border: 1px solid var(--sumi); padding: 18px 20px; position: relative; background: rgba(255,255,255,.28); }
.plan.pick { border-color: var(--shu); }
.plan.pick::before {
  content: "おすすめ"; position: absolute; right: -1px; top: -1px;
  background: var(--shu); color: var(--kin); font-size: 10.5px; padding: 2px 10px; letter-spacing: .1em;
}
html[lang="en"] .plan.pick::before { content: "POPULAR"; }
html[lang="zh-Hans"] .plan.pick::before { content: "推荐"; }
.plan h3 { font-size: 19px; letter-spacing: .1em; }
.plan .p { font-family: var(--ui); font-size: 27px; color: var(--ai); margin: 4px 0 6px; }
.plan .p small { font-size: 12.5px; color: var(--sumi-2); font-family: var(--ui); }
.plan ul { list-style: none; margin: 0; padding: 0; font-size: 13px; color: var(--sumi-2); }
.plan li { padding: 3px 0 3px 15px; position: relative; }
.plan li::before { content: ""; position: absolute; left: 0; top: 12px; width: 7px; height: 1px; background: var(--ai); }

.steps { list-style: none; margin: 0; padding: 0; counter-reset: s; }
.steps li { display: grid; grid-template-columns: 40px minmax(0,1fr); gap: 14px; padding: 13px 0; border-bottom: 1px solid var(--kin-3); }
.steps li::before {
  counter-increment: s; content: counter(s);
  font-family: var(--ui); font-size: 21px; color: var(--shu); line-height: 1.3;
}
.steps h3 { font-size: 15.5px; margin-bottom: 2px; }
.steps p { margin: 0; font-size: 13px; color: var(--sumi-2); }

.info dl { display: grid; grid-template-columns: 90px minmax(0,1fr); margin: 0; }
.info dt, .info dd { padding: 9px 0; border-bottom: 1px solid var(--kin-3); margin: 0; font-size: 13.5px; }
.info dt { color: var(--sumi-2); font-size: 12.5px; }
.cta {
  display: inline-block; margin-top: 22px; background: var(--ai); color: var(--kin);
  text-decoration: none; padding: 13px 34px; font-size: 14px; letter-spacing: .14em;
  transition: background .22s, transform .18s;
}
.cta:hover { background: var(--ai-2); transform: translateY(-2px); }
.fine { font-size: 11.5px; color: var(--sumi-2); margin-top: 14px; }

/* ── 繰る操作 ─────────────────────────────────────────────── */
.nav {
  display: flex; align-items: center; gap: 14px; justify-content: center;
  padding: 18px 20px 26px; border-top: 1px solid var(--kin-3);
}
.nav button {
  font: inherit; font-size: 13px; padding: 7px 18px; cursor: pointer;
  background: transparent; color: var(--sumi); border: 1px solid var(--sumi);
  transition: background .2s, color .2s;
}
.nav button:hover { background: var(--sumi); color: var(--kin); }
.nav button[disabled] { opacity: .3; cursor: default; }
.nav button[disabled]:hover { background: transparent; color: var(--sumi); }
.pips { display: flex; gap: 8px; }
.pips i { width: 7px; height: 7px; border-radius: 50%; background: var(--kin-3); transition: background .3s, transform .3s; }
.pips i.on { background: var(--shu); transform: scale(1.45); }

/* ── 問い合わせ ────────────────────────────────────────────── */
.form { display: grid; gap: 13px; margin-top: 6px; }
.f { display: flex; flex-direction: column; gap: 4px; min-width: 0; }
.f2 { display: grid; grid-template-columns: 1fr 1fr; gap: 13px; }
.f > label { font-size: 11px; letter-spacing: .14em; color: var(--sumi-2); }
.f .req { color: var(--shu); }
.f input[type="text"], .f input[type="email"], .f input[type="date"], .f textarea, .f select {
  font: inherit; font-size: 14px; padding: 9px 11px; width: 100%;
  background: rgba(255,255,255,.4); color: var(--sumi);
  border: 1px solid var(--kin-3); border-radius: 0;
}
.f textarea { min-height: 84px; resize: vertical; }
.f input:focus, .f textarea:focus, .f select:focus { outline: none; border-color: var(--ai); }
.f .err { font-size: 11px; color: var(--shu); min-height: 1.1em; }
.f.bad input, .f.bad textarea, .f.bad select { border-color: var(--shu); }
.consent { display: flex; gap: 9px; align-items: flex-start; font-size: 12.5px; color: var(--sumi-2); cursor: pointer; }
.consent input { accent-color: var(--ai); margin-top: 5px; }
.submit {
  font: inherit; font-size: 14px; letter-spacing: .14em; padding: 13px 34px; margin-top: 2px;
  background: var(--ai); color: var(--kin); border: none; cursor: pointer;
  transition: background .22s, transform .18s;
}
.submit:hover { background: var(--ai-2); transform: translateY(-2px); }
.sent { display: none; margin-top: 12px; padding: 11px 13px; border: 1px solid var(--ai); background: rgba(255,255,255,.5); font-size: 12.5px; }
.sent.on { display: block; }

/* ── ページ上部へ ──────────────────────────────────────────── */
.pagetop {
  position: fixed; right: 20px; bottom: 20px; z-index: 40;
  width: 50px; height: 50px; border-radius: 50%;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  background: var(--ai); color: var(--kin); text-decoration: none;
  box-shadow: 0 8px 22px rgba(0,0,0,.22);
  opacity: 0; pointer-events: none; transform: translateY(10px);
  transition: opacity .3s, transform .3s, background .22s;
}
.pagetop.on { opacity: 1; pointer-events: auto; transform: none; }
.pagetop:hover { background: var(--shu); }
.pagetop b { font-size: 15px; line-height: 1; }
.pagetop span { font-size: 7.5px; letter-spacing: .1em; margin-top: 3px; font-family: var(--ui); }

/* ── 実装メモ ──────────────────────────────────────────────── */
.tech { padding: 40px clamp(18px, 4vw, 40px) 34px; border-top: 1px solid var(--kin-3); }
.tech h2 { font-size: 17px; letter-spacing: .16em; margin-bottom: 20px; }
.techgrid { display: grid; grid-template-columns: repeat(auto-fit, minmax(232px, 1fr)); gap: 20px 28px; max-width: 1040px; }
.techgrid dt { font-size: 13.5px; font-weight: 600; margin-bottom: 3px; font-family: var(--ui); }
html[lang="en"] .techgrid dt { font-family: var(--ui); font-weight: 600; }
html[lang="zh-Hans"] .techgrid dt { font-family: var(--ui); font-weight: 700; }
.techgrid dd { margin: 0; font-size: 12.5px; color: var(--sumi-2); line-height: 1.85; }

footer { padding: 26px clamp(18px, 4vw, 40px) 54px; font-size: 12px; color: var(--sumi-2); border-top: 1px solid var(--kin-3); }
footer p { margin: 0 0 7px; text-wrap: pretty; word-break: auto-phrase; }

@media (prefers-reduced-motion: reduce) {
  .screen { scroll-behavior: auto; }
  .pane .fx { opacity: 1 !important; transform: none !important; }
  .wagara .d { stroke-dashoffset: 0; animation: none; }
  .cta:hover { transform: none; }
}
:focus-visible { outline: 2px solid var(--shu); outline-offset: 3px; }