/* ============================================================
   東錦株式会社 公式サイト リニューアル提案モック
   建築的・エディトリアル。写真主役。明朝見出し＋ゴシック本文。
   素のCSSのみ。モバイルファースト。
   ============================================================ */

:root {
  --paper: #f5f3ee;
  --paper-2: #fffefb;
  --ink: #1b1b1a;
  --ink-soft: #5a574f;
  --line: #ddd8ce;
  --accent: #9a6a3c;        /* ブロンズ（控えめな高級感） */
  --maxw: 1180px;
  --gutter: clamp(20px, 5vw, 64px);
  --serif: "Hiragino Mincho ProN", "Yu Mincho", "YuMincho", "Noto Serif JP", serif;
  --sans: "Hiragino Kaku Gothic ProN", "Hiragino Sans", "Yu Gothic", "Noto Sans JP", system-ui, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  line-height: 1.9;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  text-underline-offset: 3px;
}
img { max-width: 100%; display: block; }
a { color: inherit; }

.container { max-width: var(--maxw); margin-inline: auto; padding-inline: var(--gutter); }
.visually-hidden { position:absolute; width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0); }

/* 英字ラベル（キッカー） */
.kicker {
  font-size: .72rem; letter-spacing: .22em; text-transform: uppercase;
  color: var(--accent); font-weight: 700; margin: 0 0 14px;
  display: flex; align-items: center; gap: 12px;
}
.kicker::before { content: ""; width: 26px; height: 1px; background: var(--accent); }

/* 見出し */
.h2 { font-family: var(--serif); font-weight: 600; font-size: clamp(1.7rem, 3.6vw, 2.6rem); line-height: 1.4; margin: 0 0 .6em; letter-spacing: .02em; }
.lead { font-size: clamp(1rem, 1.6vw, 1.12rem); color: var(--ink-soft); max-width: 60ch; }

/* ---------- ヘッダー ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: saturate(1.2) blur(10px);
  border-bottom: 1px solid var(--line);
}
.site-header__inner { display: flex; align-items: center; justify-content: space-between; height: 74px; }
.brand { display: flex; align-items: baseline; gap: 12px; text-decoration: none; }
.brand__ja { font-family: var(--serif); font-size: 1.5rem; letter-spacing: .14em; font-weight: 600; }
.brand__en { font-size: .66rem; letter-spacing: .28em; color: var(--ink-soft); text-transform: uppercase; }
.nav { display: flex; align-items: center; gap: clamp(16px, 2.4vw, 40px); }
.nav a { text-decoration: none; font-size: .92rem; letter-spacing: .04em; padding: 6px 0; position: relative; }
.nav a[aria-current="page"] { color: var(--accent); }
.nav a::after { content:""; position:absolute; left:0; bottom:0; width:0; height:1px; background: var(--accent); transition: width .25s ease; }
.nav a:hover::after { width: 100%; }
.nav__cta { border: 1px solid var(--ink); border-radius: 999px; padding: 9px 20px !important; }
.nav__cta:hover { background: var(--ink); color: var(--paper); }
.nav__toggle { display: none; }

/* ---------- ヒーロー ---------- */
.hero { position: relative; min-height: min(88vh, 760px); display: flex; align-items: flex-end; color: #fff; overflow: hidden; }
.hero__media { position: absolute; inset: 0; }
.hero__media img { width: 100%; height: 100%; object-fit: cover; }
.hero__media::after { content:""; position:absolute; inset:0;
  background: linear-gradient(180deg, rgba(0,0,0,.34) 0%, rgba(0,0,0,.12) 34%, rgba(0,0,0,.66) 100%); }
.hero__inner { position: relative; z-index: 1; width: 100%; padding-block: clamp(40px, 8vh, 96px); }
.hero__kicker { color: #fff; }
.hero__kicker::before { background: #fff; }
.hero__title { font-family: var(--serif); font-weight: 500; font-size: clamp(2.1rem, 6vw, 4.2rem); line-height: 1.34; margin: 0 0 18px; text-shadow: 0 2px 30px rgba(0,0,0,.45); letter-spacing: .04em; }
.hero__sub { font-size: clamp(1rem, 1.8vw, 1.18rem); color: rgba(255,255,255,.92); max-width: 40ch; text-shadow: 0 1px 14px rgba(0,0,0,.5); }

/* ---------- セクション共通 ---------- */
.section { padding-block: clamp(64px, 11vw, 140px); }
.section--tint { background: var(--paper-2); border-block: 1px solid var(--line); }
.section__head { max-width: 720px; margin-bottom: clamp(36px, 6vw, 68px); }

/* ボタン/リンク */
.btn { display: inline-flex; align-items: center; gap: 10px; font-size: .92rem; letter-spacing: .04em;
  text-decoration: none; border: 1px solid var(--ink); border-radius: 999px; padding: 13px 28px; transition: .2s; }
.btn:hover { background: var(--ink); color: var(--paper); }
.btn--light { border-color: rgba(255,255,255,.7); color:#fff; }
.btn--light:hover { background:#fff; color: var(--ink); }
.textlink { display:inline-flex; align-items:center; gap:8px; text-decoration:none; color:var(--accent); font-size:.92rem; letter-spacing:.04em; border-bottom:1px solid transparent; }
.textlink:hover { border-bottom-color: var(--accent); }
.textlink::after { content:"→"; transition: transform .2s; }
.textlink:hover::after { transform: translateX(4px); }

/* ---------- イントロ（トップ） ---------- */
.intro { display: grid; grid-template-columns: 1fr; gap: clamp(24px, 4vw, 48px); align-items: start; }
@media (min-width: 860px) { .intro { grid-template-columns: 0.8fr 1.2fr; } }
.intro__big { font-family: var(--serif); font-size: clamp(1.5rem, 3.2vw, 2.3rem); line-height: 1.7; font-weight: 500; margin: 0; }
.intro__body p { color: var(--ink-soft); margin: 0 0 1.2em; }

/* ---------- 事例グリッド ---------- */
.works-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: clamp(14px, 1.8vw, 26px); }
.work { position: relative; text-decoration: none; color: inherit; display: block; }
.work__media { aspect-ratio: 4/3; overflow: hidden; background: #e7e3da; }
.work__media img { width: 100%; height: 100%; object-fit: cover; transition: transform .6s cubic-bezier(.2,.7,.2,1); }
.work:hover .work__media img { transform: scale(1.05); }
.work__cap { padding: 14px 2px 0; }
.work__ttl { font-family: var(--serif); font-size: 1.06rem; margin: 0 0 3px; }
.work__meta { font-size: .8rem; color: var(--ink-soft); letter-spacing: .04em; }
.work--wide { grid-column: span 2; }
@media (max-width: 620px){ .work--wide { grid-column: span 1; } }

/* ---------- 製品 ---------- */
.product { display: grid; grid-template-columns: 1fr; gap: clamp(20px, 4vw, 56px); align-items: center; padding-block: clamp(40px, 7vw, 88px); border-bottom: 1px solid var(--line); }
.product:last-child { border-bottom: 0; }
@media (min-width: 820px) {
  .product { grid-template-columns: 1fr 1fr; }
  .product:nth-child(even) .product__media { order: 2; }
}
.product__media { aspect-ratio: 4/3; overflow: hidden; background:#e7e3da; }
.product__media img { width:100%; height:100%; object-fit: cover; }
.product__abbr { font-family: var(--serif); font-size: clamp(2.4rem, 6vw, 4rem); line-height: 1; color: var(--accent); margin: 0 0 6px; letter-spacing: .02em; }
.product__name { font-size: .9rem; letter-spacing: .1em; color: var(--ink-soft); margin: 0 0 18px; }
.product__desc { color: var(--ink-soft); margin: 0 0 20px; }
.tags { display: flex; flex-wrap: wrap; gap: 8px; margin: 0; padding: 0; list-style: none; }
.tags li { font-size: .78rem; border: 1px solid var(--line); border-radius: 999px; padding: 5px 13px; color: var(--ink-soft); background: var(--paper-2); }

/* ---------- 素材から探す（フィルタ付きギャラリー） ---------- */
.matbar { display: flex; flex-wrap: wrap; gap: 10px; margin: 0 0 16px; }
.chip { font-family: var(--sans); font-size: .86rem; letter-spacing: .04em; color: var(--ink-soft);
  border: 1px solid var(--line); background: var(--paper-2); border-radius: 999px; padding: 8px 18px; cursor: pointer;
  transition: background .2s ease, color .2s ease, border-color .2s ease; }
.chip:hover { border-color: var(--accent); color: var(--ink); }
.chip[aria-pressed="true"] { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.matcount { font-size: .8rem; color: var(--ink-soft); letter-spacing: .04em; margin: 0 0 16px; }
.matgrid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: clamp(12px, 1.5vw, 20px); }
.matcard { display: block; margin: 0; padding: 0; border: 0; background: none; text-align: left; font: inherit; color: inherit; cursor: pointer; width: 100%; }
.matcard[hidden] { display: none; }
.matcard__media { position: relative; display: block; aspect-ratio: 1/1; overflow: hidden; background: #e7e3da; }
.matcard__media img { width: 100%; height: 100%; object-fit: cover; transition: transform .6s cubic-bezier(.2,.7,.2,1); }
.matcard:hover .matcard__media img,
.matcard:focus-visible .matcard__media img { transform: scale(1.05); }
.matcard:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
.matcard__badge { position: absolute; right: 8px; bottom: 8px; font-size: .68rem; letter-spacing: .04em;
  color: #fff; background: rgba(27,27,26,.72); padding: 4px 9px; border-radius: 999px; backdrop-filter: blur(2px); }
.matcard__cap { display: block; margin: 10px 0 0; padding: 0 2px; font-size: .78rem; color: var(--ink-soft); letter-spacing: .03em; }
.matcard__cap b { font-family: var(--serif); font-weight: 400; font-size: .92rem; color: var(--accent); margin-right: .5em; }

/* ---------- ライトボックス（その他の画像スライダー） ---------- */
.lightbox { border: 0; padding: 0; max-width: min(1100px, 94vw); width: 100%; background: var(--paper-2); color: var(--ink); }
.lightbox::backdrop { background: rgba(20,19,17,.78); backdrop-filter: blur(3px); }
.lightbox__stage { position: relative; background: #14130f; }
.lightbox__img { display: block; width: 100%; max-height: min(76vh, 800px); object-fit: contain; margin: 0 auto; }
.lightbox__nav { position: absolute; top: 50%; transform: translateY(-50%); width: 48px; height: 48px; border-radius: 999px;
  border: 1px solid rgba(255,255,255,.5); background: rgba(20,19,17,.45); color: #fff; font-size: 1.6rem; line-height: 1; cursor: pointer;
  display: flex; align-items: center; justify-content: center; transition: background .2s ease; }
.lightbox__nav:hover { background: rgba(20,19,17,.8); }
.lightbox__nav--prev { left: 12px; } .lightbox__nav--next { right: 12px; }
.lightbox__nav[hidden] { display: none; }
.lightbox__bar { display: flex; align-items: center; gap: 16px; padding: 14px 18px; }
.lightbox__cap { margin: 0; font-size: .85rem; color: var(--ink-soft); flex: 1 1 auto; }
.lightbox__count { margin: 0; font-size: .8rem; color: var(--ink-soft); font-variant-numeric: tabular-nums; }
.lightbox__close { border: 1px solid var(--line); background: var(--paper); color: var(--ink); font: inherit; font-size: .82rem;
  padding: 7px 14px; border-radius: 999px; cursor: pointer; }
.lightbox__close:hover { background: var(--ink); color: var(--paper); }

/* ---------- 会社概要（テーブル） ---------- */
.profile { display: grid; grid-template-columns: 1fr; gap: 0; border-top: 1px solid var(--line); }
.profile__row { display: grid; grid-template-columns: 1fr; gap: 2px; padding: 20px 0; border-bottom: 1px solid var(--line); }
@media (min-width: 720px){ .profile__row { grid-template-columns: 220px 1fr; gap: 24px; } }
.profile__row dt { font-family: var(--serif); color: var(--ink); font-size: 1rem; letter-spacing: .06em; margin: 0; }
.profile__row dd { margin: 0; color: var(--ink-soft); }

/* ---------- 沿革タイムライン ---------- */
.history { list-style: none; margin: 0; padding: 0; border-left: 2px solid var(--line); }
.history li { position: relative; padding: 0 0 32px 32px; }
.history li::before { content:""; position:absolute; left:-7px; top:6px; width:12px; height:12px; border-radius:50%; background: var(--paper); border:2px solid var(--accent); }
.history time { font-family: var(--serif); font-size: 1.05rem; color: var(--ink); display: block; margin-bottom: 4px; }
.history p { margin: 0; color: var(--ink-soft); font-size: .95rem; }

/* ---------- 帯CTA ---------- */
.cta-band { position: relative; color:#fff; text-align:center; overflow:hidden; }
.cta-band__media { position:absolute; inset:0; }
.cta-band__media img { width:100%;height:100%;object-fit:cover; }
.cta-band__media::after { content:""; position:absolute; inset:0; background: rgba(20,18,15,.62); }
.cta-band__inner { position:relative; z-index:1; padding-block: clamp(64px, 12vw, 130px); }
.cta-band .h2 { color:#fff; }

/* ---------- フッター ---------- */
.footer { background: var(--ink); color: #cfccc4; padding-block: clamp(48px, 7vw, 80px); font-size: .9rem; }
.footer a { color:#cfccc4; text-decoration: none; }
.footer a:hover { color:#fff; }
.footer__grid { display:grid; grid-template-columns: 1fr; gap: 32px; }
@media (min-width: 760px){ .footer__grid { grid-template-columns: 1.4fr 1fr 1fr; } }
.footer__brand .brand__ja { color:#fff; }
.footer__brand .brand__en { color:#8f8b81; }
.footer__nav { list-style:none; margin:0; padding:0; display:grid; gap:10px; }
.footer__ttl { font-size:.72rem; letter-spacing:.2em; text-transform:uppercase; color:#8f8b81; margin:0 0 14px; }
.footer__addr { color:#8f8b81; line-height:1.9; margin:0; }
.footer__bottom { border-top:1px solid #333; margin-top:40px; padding-top:24px; color:#8f8b81; font-size:.78rem; display:flex; justify-content:space-between; flex-wrap:wrap; gap:8px; }

/* ---------- モバイルナビ ---------- */
@media (max-width: 780px) {
  .nav { position: fixed; inset: 74px 0 auto 0; flex-direction: column; align-items: stretch; gap: 0;
    background: var(--paper); border-bottom: 1px solid var(--line); padding: 8px var(--gutter) 20px;
    transform: translateY(-120%); transition: transform .3s ease; box-shadow: 0 20px 30px rgba(0,0,0,.08); }
  .nav[data-open="true"] { transform: translateY(0); }
  .nav a { padding: 14px 0; border-bottom: 1px solid var(--line); font-size: 1rem; }
  .nav a::after { display:none; }
  .nav__cta { border:0 !important; padding: 14px 0 !important; color: var(--accent); }
  .nav__toggle { display: inline-flex; flex-direction: column; gap: 5px; background: none; border: 0; cursor: pointer; padding: 8px; }
  .nav__toggle span { width: 24px; height: 2px; background: var(--ink); transition: .3s; }
  .nav__toggle[aria-expanded="true"] span:nth-child(1){ transform: translateY(7px) rotate(45deg); }
  .nav__toggle[aria-expanded="true"] span:nth-child(2){ opacity: 0; }
  .nav__toggle[aria-expanded="true"] span:nth-child(3){ transform: translateY(-7px) rotate(-45deg); }
}

/* ---------- スクロールで浮かび上がる ---------- */
@media (prefers-reduced-motion: no-preference) {
  .reveal { opacity: 0; transform: translateY(24px); transition: opacity .7s ease, transform .7s cubic-bezier(.2,.7,.2,1); }
  .reveal.is-in { opacity: 1; transform: none; }
}