/* =========================================================
   静河 SEIKA ― 一棟貸し離れ湯宿（架空ブランド）公式サイト
   共通スタイル（case01_yado）
   色・書体は「和モダンで上質」方向の仮決め（INV-01）。
   最終決定は ChatGPT と社長。差し替えやすいよう CSS 変数に集約。
   ========================================================= */

:root {
  /* --- カラー（仮・和モダン） --- */
  --bg:      #f6f2ea;   /* 生成りの和紙 */
  --bg-2:    #efe7d9;   /* 一段沈んだ背景 */
  --bg-dark: #211f1b;   /* 墨（濃色セクション） */
  --fg:      #2a251f;   /* 本文の墨色 */
  --fg-soft: #4c463d;
  --muted:   #857b6c;   /* 補助テキスト */
  --line:    #e2d9c8;   /* 罫・境界 */
  --accent:  #2f5d54;   /* 深緑（松葉） */
  --accent-2:#a9502c;   /* 錆朱（差し色） */
  --paper-on-dark:#f3ede2;

  /* --- 書体 --- */
  --font-serif: "Shippori Mincho","Hiragino Mincho ProN","Yu Mincho","YuMincho","Noto Serif JP",serif;
  --font-sans:  system-ui,-apple-system,"Segoe UI","Hiragino Sans","Noto Sans JP","Yu Gothic",sans-serif;

  /* --- レイアウト --- */
  --wrap: 1160px;
  --gutter: clamp(20px,6vw,88px);
  --header-h: 66px;
  --radius: 4px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--fg);
  background: var(--bg);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.85;
  letter-spacing: .02em;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
img { display: block; max-width: 100%; }
a { color: inherit; }

/* ---------- 見出し・テキスト ---------- */
h1,h2,h3,h4,p { margin: 0; }
.serif { font-family: var(--font-serif); font-weight: 500; }
.eyebrow {
  font-size: .72rem; font-weight: 700; letter-spacing: .28em;
  color: var(--accent); text-transform: uppercase;
}
.eyebrow.jp { font-family: var(--font-serif); letter-spacing: .34em; color: var(--accent-2); }
h1 { font-family: var(--font-serif); font-weight: 500; line-height: 1.14;
     font-size: clamp(2.4rem,6.4vw,5rem); letter-spacing: .12em; }
h2 { font-family: var(--font-serif); font-weight: 500; line-height: 1.22;
     font-size: clamp(1.9rem,4.2vw,3.2rem); letter-spacing: .1em; }
h3 { font-family: var(--font-serif); font-weight: 500; line-height: 1.4;
     font-size: clamp(1.15rem,2.4vw,1.5rem); letter-spacing: .08em; }
.lead { color: var(--fg-soft); font-size: clamp(1rem,1.5vw,1.12rem);
        line-height: 2; max-width: 42em; }
.muted { color: var(--muted); }

/* ---------- 共通レイアウト ---------- */
.wrap { width: min(var(--wrap),100%); margin-inline: auto; padding-inline: var(--gutter); }
.section { padding-block: clamp(72px,11vw,150px); }
.section-tight { padding-block: clamp(48px,7vw,96px); }
.section-dark { background: var(--bg-dark); color: var(--paper-on-dark); }
.section-dark .lead { color: #d8cfc0; }
.section-dark .eyebrow { color: #d3a074; }
.section-alt { background: var(--bg-2); }
.stack > * + * { margin-top: 1.1em; }
.center { text-align: center; }
.center .lead { margin-inline: auto; }

/* ---------- ヘッダー / ナビ ---------- */
.site-header {
  position: fixed; inset: 0 0 auto 0; z-index: 100;
  height: var(--header-h);
  display: flex; align-items: center; justify-content: space-between;
  padding-inline: var(--gutter);
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid transparent;
  transition: background .3s ease, border-color .3s ease;
}
.site-header.scrolled { background: color-mix(in srgb, var(--bg) 94%, transparent); border-bottom-color: var(--line); }
.brand { display: inline-flex; align-items: baseline; gap: .5em; text-decoration: none; }
.brand-mark { font-family: var(--font-serif); font-size: 1.3rem; letter-spacing: .34em; color: var(--fg); }
.brand-sub { font-size: .62rem; letter-spacing: .3em; color: var(--muted); }
.nav-list { list-style: none; margin: 0; padding: 0; display: flex; gap: clamp(14px,2vw,30px); align-items: center; }
.nav-link {
  position: relative; text-decoration: none; color: var(--fg-soft);
  font-size: .82rem; letter-spacing: .12em; padding: 6px 2px;
  transition: color .25s ease;
}
.nav-link::after {
  content: ""; position: absolute; left: 0; bottom: 0; width: 100%;
  height: 1px; background: var(--accent); transform: scaleX(0);
  transform-origin: left; transition: transform .3s ease;
}
.nav-link:hover { color: var(--fg); }
.nav-link:hover::after,
.nav-link[aria-current="page"]::after { transform: scaleX(1); }
.nav-link[aria-current="page"] { color: var(--accent); }
.nav-cta {
  display: inline-flex; align-items: center; padding: 8px 18px;
  border: 1px solid var(--accent); border-radius: 999px; color: var(--accent);
  font-size: .78rem; letter-spacing: .14em; text-decoration: none;
  transition: background .25s ease, color .25s ease;
}
.nav-cta:hover { background: var(--accent); color: var(--bg); }
.nav-toggle {
  display: none; width: 42px; height: 42px; border: 1px solid var(--line);
  border-radius: 8px; background: var(--bg); cursor: pointer; padding: 0;
  align-items: center; justify-content: center;
}
.nav-toggle span, .nav-toggle span::before, .nav-toggle span::after {
  content: ""; display: block; width: 18px; height: 1.5px; background: var(--fg);
  transition: transform .3s ease, opacity .3s ease;
}
.nav-toggle span::before { transform: translateY(-6px); }
.nav-toggle span::after  { transform: translateY(6px); }
.nav-toggle span { position: relative; }
.nav-toggle span::before, .nav-toggle span::after { position: absolute; left: 0; }
body.nav-open .nav-toggle span { background: transparent; }
body.nav-open .nav-toggle span::before { transform: rotate(45deg); }
body.nav-open .nav-toggle span::after  { transform: rotate(-45deg); }

/* ---------- ボタン ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .5em;
  min-height: 54px; padding: 0 32px; border-radius: 999px;
  font-family: var(--font-sans); font-size: .92rem; font-weight: 600; letter-spacing: .1em;
  text-decoration: none; cursor: pointer; border: 1px solid transparent;
  transition: transform .25s ease, background .25s ease, color .25s ease, box-shadow .25s ease;
}
.btn-primary { background: var(--accent); color: var(--bg); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 28px -14px var(--accent); }
.btn-outline { background: transparent; border-color: currentColor; color: var(--fg); }
.btn-outline:hover { background: var(--fg); color: var(--bg); }
.section-dark .btn-outline { color: var(--paper-on-dark); }

/* ---------- 画像フレーム（写真は大きく／プレースホルダー gradient） ---------- */
.media {
  position: relative; overflow: hidden; border-radius: var(--radius);
  background: linear-gradient(150deg,#cdbfa6,#8a9c8f 55%,#3f5148);
  isolation: isolate;
}
.media::after { /* プレースホルダー時の質感 */
  content: ""; position: absolute; inset: 0; z-index: 1;
  background: radial-gradient(120% 80% at 30% 20%, rgba(255,255,255,.18), transparent 60%);
  pointer-events: none;
}
.media img {
  position: relative; z-index: 2;
  width: 100%; height: 100%; object-fit: cover; object-position: center;
}
/* コンテキスト別のプレースホルダー色（画像が来るまでの上質な下地） */
.ph-top     { background: linear-gradient(155deg,#2f4a44,#7d8f81 48%,#d8c9ac); }
.ph-room    { background: linear-gradient(155deg,#3a4a4f,#8a9296 50%,#e2d6c0); }
.ph-cuisine { background: linear-gradient(155deg,#5a3a2c,#a97148 52%,#e7d3ad); }
.ph-onsen   { background: linear-gradient(160deg,#22343a,#4f7a76 50%,#cfd8cf); }
.ph-access  { background: linear-gradient(150deg,#3f4a39,#8b9a6f 52%,#e4ddc4); }
.ph-reserve { background: linear-gradient(150deg,#2c3a3a,#6f6152 55%,#d8c7ab); }
.ph-dawn    { background: linear-gradient(160deg,#4a5a63,#c79a7a 60%,#f0dcb8); }
.ph-noon    { background: linear-gradient(160deg,#3f6a63,#9db79a 55%,#eae3c8); }
.ph-dusk    { background: linear-gradient(160deg,#6d3f47,#c07850 55%,#efc99a); }
.ph-night   { background: linear-gradient(160deg,#171f2b,#2f4a55 60%,#7d8a86); }

/* 主要部が切れないよう十分な高さを確保（社長指摘：写真は大きく・見切れさせない） */
.media-hero  { aspect-ratio: 16/9; }
.media-tall  { aspect-ratio: 3/4; }
.media-wide  { aspect-ratio: 21/9; }
.media-card  { aspect-ratio: 4/3; }
.media-square{ aspect-ratio: 1/1; }
@media (max-width: 700px) {
  .media-hero { aspect-ratio: 4/5; }
  .media-wide { aspect-ratio: 4/3; }
}

/* ---------- 下層ページの見出しヒーロー ---------- */
.page-hero { position: relative; min-height: 62svh; display: grid; align-items: end; overflow: hidden; }
.page-hero .media { position: absolute; inset: 0; border-radius: 0; }
.page-hero .media img { will-change: transform; }
.page-hero .overlay { position: absolute; inset: 0; z-index: 3;
  background: linear-gradient(180deg, rgba(20,18,14,.25), rgba(20,18,14,.15) 40%, rgba(20,18,14,.6)); }
.page-hero .page-hero-inner { position: relative; z-index: 4; width: 100%;
  padding: 0 var(--gutter) clamp(40px,7vh,84px); color: #f5efe4; }
.page-hero .eyebrow { color: #e7c39c; }
.page-hero h1 { font-size: clamp(2.6rem,8vw,5.4rem); letter-spacing: .22em; text-indent: .22em;
  margin: .1em 0 .3em; text-shadow: 0 6px 30px rgba(0,0,0,.35); }
.page-hero .page-hero-sub { max-width: 32em; color: #efe7d9; font-family: var(--font-serif); letter-spacing: .06em; }

/* ---------- パララックス（画像＋前景テキスト） ---------- */
.parallax { position: relative; min-height: 92svh; overflow: hidden; color: #f4eee2; display: grid; }
.parallax .bg { position: absolute; z-index: 0; top: -12%; left: 0; width: 100%; height: 124%; will-change: transform; }
.parallax .bg .media { position: absolute; inset: 0; border-radius: 0; height: 100%; }
.parallax .bg .media img { height: 100%; }
.parallax .veil { position: absolute; inset: 0; z-index: 1; background: linear-gradient(110deg, rgba(18,16,12,.55), rgba(18,16,12,.12) 60%, transparent); }
.parallax .parallax-body { position: relative; z-index: 2; align-self: center; padding: clamp(48px,8vw,110px) var(--gutter); width: min(var(--wrap),100%); margin-inline: auto; }
.parallax .parallax-card { max-width: 30em; }
.parallax .parallax-card .kicker { font-size: .72rem; letter-spacing: .24em; color: #e7c39c; font-weight: 700; }
.parallax .parallax-card h2 { margin: .4em 0 .5em; }
.parallax .parallax-card p { color: #e7ddcc; }
.parallax.right .parallax-body { margin-left: auto; }
.parallax.right .veil { background: linear-gradient(250deg, rgba(18,16,12,.55), rgba(18,16,12,.12) 60%, transparent); }

/* ---------- 縦タイムライン（onsen 用） ---------- */
.timeline { position: relative; }
.timeline::before { content: ""; position: absolute; left: clamp(14px,4vw,50%); top: 0; bottom: 0; width: 1px; background: var(--line); }
.tl-item { position: relative; display: grid; grid-template-columns: 1fr 1fr; gap: clamp(20px,4vw,56px); align-items: center;
  padding-block: clamp(28px,5vw,60px); }
.tl-item .tl-dot { position: absolute; left: clamp(14px,4vw,50%); top: clamp(40px,6vw,72px);
  width: 12px; height: 12px; border-radius: 50%; background: var(--accent); transform: translateX(-50%);
  box-shadow: 0 0 0 6px var(--bg); }
.tl-item .tl-time { font-family: var(--font-serif); font-size: clamp(1.4rem,3vw,2.2rem); letter-spacing: .1em; color: var(--accent); }
.tl-item .tl-text h3 { margin-bottom: .4em; }
.tl-item .tl-text p { color: var(--muted); }
.tl-item:nth-child(even) .tl-media { order: 2; }
@media (max-width: 760px) {
  .timeline::before { left: 16px; }
  .tl-item { grid-template-columns: 1fr; gap: 16px; padding-left: 40px; }
  .tl-item .tl-dot { left: 16px; top: 34px; }
  .tl-item:nth-child(even) .tl-media { order: 0; }
}

/* ---------- カード ---------- */
.grid { display: grid; gap: clamp(18px,3vw,34px); }
.grid-3 { grid-template-columns: repeat(3,minmax(0,1fr)); }
.grid-2 { grid-template-columns: repeat(2,minmax(0,1fr)); }
.card {
  background: var(--bg); border: 1px solid var(--line); border-radius: var(--radius);
  overflow: hidden; display: flex; flex-direction: column;
  transition: transform .35s ease, box-shadow .35s ease;
}
.card:hover { transform: translateY(-4px); box-shadow: 0 22px 44px -30px rgba(31,26,18,.5); }
.card-body { padding: clamp(20px,2.4vw,30px); display: flex; flex-direction: column; gap: .6em; flex: 1; }
.card .kicker { font-size: .7rem; letter-spacing: .2em; color: var(--accent-2); font-weight: 700; }
.card p { color: var(--muted); font-size: .95rem; }
.link-more { align-self: flex-start; margin-top: auto; padding-top: .4em;
  font-size: .82rem; letter-spacing: .12em; color: var(--accent); text-decoration: none;
  border-bottom: 1px solid transparent; transition: border-color .25s; }
.link-more:hover { border-color: var(--accent); }

/* ---------- フッター ---------- */
.site-footer { background: var(--bg-dark); color: var(--paper-on-dark); padding-block: clamp(56px,7vw,88px); }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 40px; align-items: start; }
.footer-brand .brand-mark { color: var(--paper-on-dark); }
.footer-brand p { color: #b6ac9c; font-size: .9rem; margin-top: 1em; max-width: 26em; }
.footer-col h4 { font-size: .72rem; letter-spacing: .2em; color: #d3a074; font-family: var(--font-sans); font-weight: 700; margin-bottom: 1em; }
.footer-col ul { list-style: none; margin: 0; padding: 0; display: grid; gap: .7em; }
.footer-col a { color: #cfc6b6; text-decoration: none; font-size: .9rem; transition: color .25s; }
.footer-col a:hover { color: #fff; }
.footer-bottom { margin-top: 48px; padding-top: 24px; border-top: 1px solid #3a3630;
  display: flex; flex-wrap: wrap; gap: 12px; justify-content: space-between;
  color: #8c8272; font-size: .74rem; letter-spacing: .06em; }

/* ---------- ローディング ---------- */
.loader { position: fixed; inset: 0; z-index: 9999; display: grid; place-items: center;
  background: var(--bg-dark); color: var(--paper-on-dark); }
.loader-inner { display: grid; justify-items: center; gap: 20px; }
.loader-mark { font-family: var(--font-serif); font-size: 1.5rem; letter-spacing: .4em; }
.spinner { width: 46px; aspect-ratio: 1; border: 2px solid rgba(243,237,226,.25);
  border-top-color: #d3a074; border-radius: 50%; animation: seika-spin .9s linear infinite; }
@keyframes seika-spin { to { transform: rotate(360deg); } }
.loader-num { font-size: .8rem; letter-spacing: .22em; color: #b6ac9c; font-variant-numeric: tabular-nums; }

/* ---------- reveal（js-ready のときだけ隠す＝CDN失敗時も内容が読める） ---------- */
.js-ready .reveal   { opacity: 0; }
.js-ready .reveal-y { opacity: 0; transform: translateY(34px); }

/* ---------- レスポンシブ ---------- */
@media (max-width: 860px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
}
@media (max-width: 760px) {
  .nav-toggle { display: inline-flex; }
  .nav {
    position: fixed; inset: var(--header-h) 0 auto 0; z-index: 90;
    background: var(--bg); border-bottom: 1px solid var(--line);
    transform: translateY(-120%); transition: transform .35s ease;
    padding: 18px var(--gutter) 26px;
  }
  body.nav-open .nav { transform: translateY(0); }
  .nav-list { flex-direction: column; align-items: flex-start; gap: 4px; }
  .nav-list li { width: 100%; }
  .nav-link { display: block; width: 100%; padding: 12px 0; border-bottom: 1px solid var(--line); }
  .nav-link::after { display: none; }
  .nav-cta { margin-top: 12px; }
  .grid-3, .grid-2 { grid-template-columns: 1fr; }
}

/* ---------- reduced-motion ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .loader { display: none !important; }
  .spinner { animation: none; }
  .js-ready .reveal, .js-ready .reveal-y { opacity: 1 !important; transform: none !important; }
  *,*::before,*::after {
    animation-duration: .001ms !important; animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
}