/* =========================================================
   温泉へ行こう。 — Japanese Onsen
   Calm, cinematic, Japanese-minimal. Vanilla CSS.
   ========================================================= */
:root{
  --ink:#0e1211;            /* night */
  --ink-2:#151a18;
  --sumi:#1d1b18;           /* text on washi */
  --washi:#f3eee5;          /* paper */
  --washi-2:#ebe4d7;
  --mute:#5c564c;           /* secondary on light (AA on washi) */
  --mute-d:rgba(255,255,255,.78); /* secondary on dark */
  --line:rgba(29,27,24,.14);
  --line-d:rgba(255,255,255,.16);
  --shu:#a8402b;            /* vermilion accent */
  --gold:#c8a970;
  --serif:"Shippori Mincho","Hiragino Mincho ProN","Yu Mincho","YuMincho","Noto Serif JP","Noto Serif CJK JP","Source Han Serif JP",serif;
  --sans:-apple-system,BlinkMacSystemFont,"Segoe UI","Helvetica Neue",Inter,Arial,"Hiragino Sans","Noto Sans JP",sans-serif;
  --ease:cubic-bezier(.22,.61,.36,1);
  --slow:1.6s;
  --wrap:min(1240px, calc(100% - 2*var(--gutter)));
  --gutter:clamp(20px, 5vw, 72px);
  --header-h:64px;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:calc(var(--header-h) + 16px)}
body{margin:0;background:var(--ink);color:var(--sumi);font-family:var(--serif);font-size:clamp(16px,1.05vw + 10px,19px);line-height:1.9;
  font-feature-settings:"palt" 0;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
img{display:block;max-width:100%;height:auto}
picture{display:contents} /* <picture> wrappers stay layout-neutral so .media img / .frame img rules apply unchanged */
a{color:inherit}
p{margin:0}
h1,h2,h3{margin:0;font-weight:500}
ul,ol{margin:0;padding:0;list-style:none}
button{font:inherit;color:inherit}

/* ---------- ruby / furigana ---------- */
ruby{ruby-position:over;ruby-align:center}
rt{font-family:var(--sans);font-size:.48em;font-weight:500;letter-spacing:.04em;line-height:1;opacity:.82;user-select:none;-webkit-user-select:none}
.display rt,.display-2 rt,.h2 rt{font-size:.3em;letter-spacing:.12em;opacity:.78;font-weight:400}
.lead rt,.season-kanji rt,.vertical-title rt{font-size:.34em}
html.no-furigana rt{display:none}

/* ---------- English layer ---------- */
.en{font-family:var(--sans);font-size:.8em;line-height:1.6;letter-spacing:.005em;color:var(--mute);margin-top:.35em;font-weight:400}
.theme-dark .en,.dark-text .en{color:var(--mute-d)}
.en i{font-style:italic}
.en-inline{font-family:var(--sans);font-size:.78em;letter-spacing:.06em;opacity:.8;margin-left:.6em;font-weight:400}
.en-display{font-size:clamp(1rem,1.6vw,1.45rem);letter-spacing:.02em;margin-top:.6em}
.en-h2{font-size:clamp(.95rem,1.1vw + .5rem,1.3rem);letter-spacing:.02em;margin-top:.5em}
.en-h3{font-size:.85rem;letter-spacing:.04em;text-transform:none;margin-top:.15em}
.en-lead{font-size:clamp(1rem,.9vw + .6rem,1.25rem);margin-top:.5em}
html.no-en .en,html.no-en .en-inline,html.no-en .w-en{display:none !important}

/* ---------- layout helpers ---------- */
.wrap{width:var(--wrap);margin-inline:auto}
.theme-light{background:var(--washi);color:var(--sumi)}
.theme-dark{background:var(--ink);color:#f4f1ea}
.section-no{font-family:var(--sans);font-size:.78rem;letter-spacing:.32em;color:var(--shu);margin-bottom:1.6rem;font-weight:500}
.section-no.light{color:var(--gold)}
.section-no::before{content:"";display:inline-block;width:28px;height:1px;background:currentColor;vertical-align:middle;margin-right:12px;opacity:.7}
.h2{font-size:clamp(2.1rem,4.2vw + .5rem,4.4rem);line-height:1.45;letter-spacing:.06em;font-weight:500}
.display{font-size:clamp(2.9rem,8.4vw,8.4rem);line-height:1.3;letter-spacing:.08em;font-weight:500}
.display-2{font-size:clamp(2.4rem,6vw,6rem);line-height:1.35;letter-spacing:.08em;font-weight:500}
.lead{font-size:clamp(1.5rem,2.2vw + .6rem,2.6rem);line-height:1.75;letter-spacing:.06em;margin-top:2.4rem}
.lead-sm{font-size:clamp(1.1rem,1vw + .7rem,1.5rem);line-height:2.1;letter-spacing:.06em;margin-top:1.8rem}
.body{margin-top:2.2rem;max-width:34em}
.body p:not(.en){margin-top:1.4em;letter-spacing:.04em}
.body p.en{margin-top:.4em}
.section-head{margin-bottom:clamp(48px,7vw,96px)}
.section-head.center{text-align:center}
.section-head.center .section-no::before{display:none}
.br-sm{display:none}
.frame{overflow:hidden;position:relative}
.frame img{width:100%;height:100%;object-fit:cover}
.photo-caption{position:absolute;right:var(--gutter);bottom:20px;z-index:3;font-family:var(--sans);font-size:.72rem;letter-spacing:.14em;color:rgba(255,255,255,.72);text-shadow:0 1px 6px rgba(0,0,0,.5)}
.photo-caption rt{font-size:.62em}
figcaption{font-family:var(--sans);font-size:.8rem;letter-spacing:.08em;color:var(--mute);margin-top:14px}

.skip{position:fixed;left:16px;top:-80px;z-index:100;background:#fff;color:#000;padding:10px 16px;border-radius:8px;font-family:var(--sans);font-size:.9rem;transition:top .2s}
.skip:focus{top:12px}
:focus-visible{outline:2px solid var(--gold);outline-offset:3px;border-radius:4px}

/* ---------- media & scrims ---------- */
.media{position:absolute;inset:0;overflow:hidden}
.media img{width:100%;height:100%;object-fit:cover;will-change:transform;transform-origin:50% 60%}
.scrim{position:absolute;inset:0;pointer-events:none;z-index:1}
.scrim-hero{background:linear-gradient(180deg,rgba(8,10,10,.55) 0%,rgba(8,10,10,.12) 30%,rgba(8,10,10,.18) 55%,rgba(8,10,10,.78) 100%)}
.scrim-center{background:radial-gradient(ellipse at 50% 50%,rgba(6,8,8,.62) 0%,rgba(6,8,8,.42) 45%,rgba(6,8,8,.62) 100%)}
.scrim-left{background:linear-gradient(90deg,rgba(6,9,8,.78) 0%,rgba(6,9,8,.45) 38%,rgba(6,9,8,.08) 70%),linear-gradient(0deg,rgba(14,18,17,1) 0%,rgba(14,18,17,0) 22%)}
.scrim-season{background:linear-gradient(90deg,rgba(5,7,7,.72) 0%,rgba(5,7,7,.35) 45%,rgba(5,7,7,.1) 75%),linear-gradient(0deg,rgba(5,7,7,.55),rgba(5,7,7,0) 40%)}
.scrim-end{background:linear-gradient(180deg,rgba(4,8,14,.5),rgba(4,8,14,.35) 40%,rgba(4,8,14,.72))}
canvas.steam{position:absolute;inset:0;width:100%;height:100%;z-index:1;pointer-events:none;mix-blend-mode:screen}

/* ---------- header / toolbar ---------- */
.site-header{position:fixed;inset:0 0 auto 0;z-index:50;height:var(--header-h);display:flex;align-items:center;justify-content:space-between;
  padding:0 var(--gutter);padding-top:env(safe-area-inset-top);color:#fff;transition:background .8s var(--ease),color .8s var(--ease),box-shadow .8s var(--ease)}
.site-header.is-scrolled{background:rgba(14,18,17,.55);-webkit-backdrop-filter:saturate(1.4) blur(18px);backdrop-filter:saturate(1.4) blur(18px);box-shadow:0 1px 0 rgba(255,255,255,.06)}
.site-header.on-light{background:rgba(243,238,229,.72);color:var(--sumi);box-shadow:0 1px 0 var(--line)}
.brand{display:flex;align-items:center;gap:14px;font-size:1rem;letter-spacing:.14em}
.brand a{text-decoration:none;color:inherit}
.sy-logo{display:inline-flex;align-items:center;gap:9px;border-radius:10px}
.sy-mark{display:block;width:36px;height:36px;flex:0 0 36px}
.sy-mark--on-light{display:none}
.on-light .sy-mark--on-dark{display:none}
.on-light .sy-mark--on-light{display:block}
.sy-wordmark{font-family:"Avenir Next",Avenir,"Trebuchet MS",var(--sans);font-size:1.32rem;font-weight:650;letter-spacing:-.06em;line-height:1;white-space:nowrap}
.sy-wordmark>span{padding-inline:.04em;color:#d88a6f}
.on-light .sy-wordmark>span{color:#ba644b}
.brand-divider{display:inline-block;width:1px;height:22px;background:currentColor;opacity:.35}
.sy-logo:focus-visible,.brand-name:focus-visible{outline:2px solid currentColor;outline-offset:4px}
.brand-mark{display:inline-grid;place-items:center;width:32px;height:32px;border:1px solid currentColor;border-radius:50%;font-size:.95rem;line-height:1;opacity:.95}
.brand-name rt{font-size:.5em}
.toolbar{display:flex;gap:8px;padding:5px;border-radius:999px;background:rgba(0,0,0,.28);border:1px solid rgba(255,255,255,.18);
  -webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px)}
.on-light .toolbar{background:rgba(255,255,255,.6);border-color:var(--line)}
.toggle{display:inline-flex;align-items:center;gap:9px;min-height:40px;padding:0 14px 0 14px;border:0;border-radius:999px;background:transparent;cursor:pointer;
  font-family:var(--sans);font-size:.82rem;letter-spacing:.06em;transition:background .4s var(--ease)}
.toggle:hover{background:rgba(255,255,255,.12)}
.on-light .toggle:hover{background:rgba(0,0,0,.05)}
.toggle-label{font-weight:500}
.toggle-switch{position:relative;width:30px;height:18px;border-radius:999px;background:rgba(255,255,255,.28);transition:background .4s var(--ease)}
.on-light .toggle-switch{background:rgba(0,0,0,.18)}
.toggle-switch span{position:absolute;top:2px;left:2px;width:14px;height:14px;border-radius:50%;background:#fff;box-shadow:0 1px 3px rgba(0,0,0,.3);transition:transform .45s var(--ease)}
.toggle[aria-pressed="true"] .toggle-switch{background:var(--shu)}
.toggle[aria-pressed="true"] .toggle-switch span{transform:translateX(12px)}
.toggle-state{font-size:.7rem;letter-spacing:.12em;min-width:2.2em;opacity:.8}
.toggle:focus-visible{outline-offset:1px;border-radius:999px}

/* ---------- reveal ---------- */
html.js [data-reveal]{opacity:0;transform:translateY(28px);transition:opacity 1.4s var(--ease) var(--d,0s),transform 1.6s var(--ease) var(--d,0s)}
html.js [data-reveal="fade"]{transform:none;transition:opacity 1.8s var(--ease) var(--d,0s)}
html.js [data-reveal="slow"]{transform:translateY(18px);transition:opacity 2.4s var(--ease) var(--d,0s),transform 2.6s var(--ease) var(--d,0s)}
html.js [data-reveal].is-in{opacity:1;transform:none}

/* ---------- HERO ---------- */
.hero{position:relative;min-height:100vh;min-height:100svh;display:grid;place-items:center;overflow:hidden;isolation:isolate;color:#fff}
.hero .media img{transform:scale(1.04)}
html.js .hero .media{opacity:0;transition:opacity 2.6s var(--ease)}
html.js.loaded .hero .media{opacity:1}
.hero-inner{position:relative;z-index:2;text-align:center;padding:calc(var(--header-h) + 4vh) var(--gutter) 12vh;text-shadow:0 2px 30px rgba(0,0,0,.35)}
.hero .eyebrow{font-size:clamp(.85rem,.6vw + .6rem,1.05rem);letter-spacing:.4em;margin-bottom:2.2rem;opacity:.92}
.hero .eyebrow rt{font-size:.55em;letter-spacing:.1em}
.hero h1{margin-left:.08em}
.hero .en-display{color:rgba(255,255,255,.86)}
.hero-sub{margin-top:clamp(28px,4vh,48px);font-size:clamp(1.1rem,1.3vw + .6rem,1.7rem);letter-spacing:.14em;line-height:2.1}
.hero .en{color:rgba(255,255,255,.82)}
html.js .hero-in{opacity:0;transform:translateY(18px);transition:opacity 2s var(--ease) var(--d,0s),transform 2.4s var(--ease) var(--d,0s)}
html.js.loaded .hero-in{opacity:1;transform:none}
.scroll-cue{position:absolute;z-index:2;left:50%;bottom:28px;translate:-50% 0;display:flex;flex-direction:column;align-items:center;gap:4px;text-decoration:none;
  font-family:var(--sans);font-size:.7rem;letter-spacing:.3em;color:rgba(255,255,255,.8)}
.scroll-cue .en-inline{margin:0;font-size:.62rem}
.scroll-cue i{display:block;width:1px;height:46px;margin-top:8px;background:linear-gradient(rgba(255,255,255,.9),rgba(255,255,255,0));transform-origin:top;animation:cue 3.2s var(--ease) infinite}
@keyframes cue{0%{transform:scaleY(0);opacity:0}30%{opacity:1}60%{transform:scaleY(1);opacity:1}100%{transform:scaleY(1);opacity:0}}
.hero .photo-caption{bottom:28px}

/* water shimmer: soft caustic light on the lower part of the image */
.shimmer{position:absolute;left:-10%;right:-10%;bottom:0;height:42%;z-index:1;pointer-events:none;opacity:.22;mix-blend-mode:soft-light;
  background:repeating-radial-gradient(ellipse 60px 14px at 50% 50%,rgba(255,255,255,.5) 0 2px,transparent 3px 26px);
  -webkit-mask-image:linear-gradient(0deg,#000 10%,transparent);mask-image:linear-gradient(0deg,#000 10%,transparent);
  animation:shimmer 18s ease-in-out infinite alternate}
@keyframes shimmer{from{transform:translate3d(-2%,0,0) scaleY(1)}to{transform:translate3d(2%,-1.5%,0) scaleY(1.08)}}

/* ---------- 01 WHAT ---------- */
.what{padding:clamp(110px,16vw,220px) 0}
.what-grid{display:grid;grid-template-columns:1.05fr 1fr;gap:clamp(40px,7vw,120px);align-items:center}
.what-figure{margin:0}
.what-figure .frame{aspect-ratio:4/5;border-radius:2px}
.what-figure .frame img{transform:scale(1.12)}
.stats{display:flex;gap:clamp(28px,5vw,72px);margin:3.4rem 0 0;padding-top:2rem;border-top:1px solid var(--line)}
.stats div{display:flex;flex-direction:column-reverse}
.stats dd{margin:0;font-size:clamp(2.2rem,3vw + .6rem,3.4rem);line-height:1.1;letter-spacing:.02em;font-weight:400}
.stats dd small{font-size:.38em;letter-spacing:.1em;margin:0 .3em}
.stats dt{font-size:.9rem;letter-spacing:.12em;margin-top:.6rem;color:var(--mute)}
.stats dt .en{display:block;font-size:.78rem;margin-top:0}

/* ---------- 02 WARMTH (sticky) ---------- */
.warmth{position:relative;height:340vh}
.sticky{position:sticky;top:0;height:100vh;height:100svh;overflow:hidden;isolation:isolate}
.warmth .media img{transform:scale(1.02)}
.warmth-inner{position:relative;z-index:2;height:100%;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:0 var(--gutter)}
.warmth .section-no::before{display:none}
.warmth-lines{position:relative;width:100%;max-width:900px;height:9.5em;margin-top:clamp(40px,7vh,80px)}
.warmth-line{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:flex-start}
.warmth-line .jp{font-size:clamp(1.5rem,2.6vw + .5rem,2.8rem);letter-spacing:.12em;line-height:1.9}
.warmth-line .en{font-size:clamp(.95rem,.8vw + .55rem,1.2rem)}
html.js [data-line]{opacity:0;transform:translateY(16px);transition:opacity 1.6s var(--ease),transform 1.8s var(--ease)}
html.js [data-line].is-on{opacity:1;transform:none}

/* ---------- 03 NATURE ---------- */
.nature{padding:clamp(110px,15vw,200px) 0 clamp(90px,12vw,160px)}
.nature-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:clamp(18px,2.2vw,32px)}
.n-card:nth-child(even){transform:translateY(clamp(0px,6vw,90px))}
html.js .n-card:nth-child(even)[data-reveal]{transform:translateY(calc(clamp(0px,6vw,90px) + 28px))}
html.js .n-card:nth-child(even)[data-reveal].is-in{transform:translateY(clamp(0px,6vw,90px))}
.nature-grid{padding-bottom:clamp(0px,6vw,90px)}
.n-card figure{position:relative;margin:0;overflow:hidden;border-radius:2px;aspect-ratio:4/5;background:#222;color:#fff}
.n-img{position:absolute;inset:0}
.n-img img{width:100%;height:100%;object-fit:cover;transform:scale(1.04);transition:transform 4s var(--ease)}
.n-card:hover .n-img img{transform:scale(1.1)}
.n-card figcaption{position:absolute;inset:auto 0 0 0;padding:clamp(22px,3vw,40px);margin:0;font-family:var(--serif);color:#fff;letter-spacing:.06em;
  background:linear-gradient(0deg,rgba(6,8,8,.86) 0%,rgba(6,8,8,.55) 55%,rgba(6,8,8,0) 100%);padding-top:clamp(80px,10vw,140px)}
.n-card h3{font-size:clamp(1.5rem,1.6vw + .8rem,2.3rem);line-height:1.6;letter-spacing:.1em}
.n-card h3 rt{font-size:.36em}
.n-card .en{color:rgba(255,255,255,.8)}
.n-desc{margin-top:.9rem;font-size:1.02rem;line-height:2}
.n-place{margin-top:1rem;font-family:var(--sans);font-size:.72rem;letter-spacing:.14em;color:rgba(255,255,255,.66)}
.n-place rt{font-size:.62em}

/* ---------- 04 ROTENBURO ---------- */
.roten{position:relative}
.roten-hero{position:relative;min-height:100vh;min-height:100svh;overflow:hidden;isolation:isolate;display:flex;align-items:center}
.roten-hero .media img{transform:scale(1.15)}
.roten-hero-inner{position:relative;z-index:2;display:flex;flex-direction:row-reverse;justify-content:space-between;align-items:center;gap:40px;padding:120px 0}
.vertical-title{writing-mode:vertical-rl;font-size:clamp(3.4rem,8vw,8rem);letter-spacing:.24em;line-height:1.3;font-weight:500;text-shadow:0 2px 40px rgba(0,0,0,.4)}
.vertical-title rt{font-size:.24em;letter-spacing:.3em}
.roten-copy{max-width:520px;text-shadow:0 1px 20px rgba(0,0,0,.4)}
.roten-copy .lead{margin-top:1.4rem}
.roten-detail{display:grid;grid-template-columns:.9fr 1fr;gap:clamp(40px,7vw,120px);align-items:center;padding:clamp(80px,12vw,180px) 0 clamp(110px,14vw,200px)}
.roten-figure{margin:0}
.roten-figure .frame{aspect-ratio:4/5}
.roten-figure figcaption,.roten figcaption{color:rgba(255,255,255,.66)}
.roten-text .body{margin-top:0}
.roten-text .body p:first-child{margin-top:0;font-size:1.25em}
.roten-points{display:grid;grid-template-columns:repeat(4,1fr);margin-top:3rem;border-top:1px solid var(--line-d)}
.roten-points li{padding:1.4rem 0 0;text-align:left}
.roten-points .kanji{display:block;font-size:2rem;line-height:1.5}
.roten-points .kanji rt{font-size:.38em}
.roten-points .en{margin-top:0;font-size:.78rem;letter-spacing:.1em}

/* ---------- 05 SEASONS ---------- */
.seasons{position:relative;height:520vh}
.season-layers{position:absolute;inset:0}
.season-layer{position:absolute;inset:0;opacity:0;transition:opacity 1.8s var(--ease)}
.season-layer.is-active{opacity:1}
.season-layer img{width:100%;height:100%;object-fit:cover;transform:scale(1.08);transition:transform 9s linear}
.season-layer.is-active img{transform:scale(1.0)}
.seasons-inner{position:relative;z-index:2;height:100%;display:grid;grid-template-columns:1fr auto;grid-template-rows:auto 1fr;padding:calc(var(--header-h) + 5vh) 0 8vh;column-gap:40px}
.seasons-head{grid-column:1/2;max-width:640px;text-shadow:0 1px 20px rgba(0,0,0,.4)}
.seasons-head .h2{font-size:clamp(1.9rem,3vw + .5rem,3.4rem)}
.seasons-sub{margin-top:1rem;font-size:clamp(1rem,.6vw + .7rem,1.25rem);letter-spacing:.08em}
.season-texts{grid-column:1/2;position:relative;align-self:end;min-height:16em}
.season-text{position:absolute;left:0;bottom:0;max-width:640px;opacity:0;transform:translateY(20px);transition:opacity 1.4s var(--ease),transform 1.6s var(--ease);text-shadow:0 1px 24px rgba(0,0,0,.5);pointer-events:none}
.season-text.is-active{opacity:1;transform:none;transition-delay:.25s}
.season-kanji{font-size:clamp(5rem,13vw,11rem);line-height:1.15;font-weight:500;letter-spacing:.04em}
.season-line{font-size:clamp(1.3rem,1.8vw + .5rem,2.2rem);letter-spacing:.1em;line-height:1.9;margin-top:.6rem}
.season-text .en{font-size:clamp(.9rem,.6vw + .6rem,1.1rem)}
.season-place{margin-top:1.2rem;font-family:var(--sans);font-size:.72rem;letter-spacing:.14em;color:rgba(255,255,255,.66)}
.season-place rt{font-size:.62em}
.season-nav{grid-column:2/3;grid-row:1/3;display:flex;flex-direction:column;justify-content:center;gap:6px}
.season-nav button{display:flex;align-items:center;gap:12px;background:none;border:0;cursor:pointer;padding:10px 4px;color:rgba(255,255,255,.55);font-size:1.15rem;letter-spacing:.1em;transition:color .8s var(--ease)}
.season-nav button::before{content:"";width:18px;height:1px;background:currentColor;transition:width .8s var(--ease)}
.season-nav button[aria-current="true"]{color:#fff}
.season-nav button[aria-current="true"]::before{width:40px}
.season-nav .en{margin:0;font-size:.7rem;letter-spacing:.14em;color:inherit}
.season-progress{position:absolute;left:0;right:0;bottom:4vh;height:1px;background:rgba(255,255,255,.18)}
.season-progress i{position:absolute;inset:0;background:rgba(255,255,255,.75);transform-origin:left;transform:scaleX(0)}

/* ---------- 06 DAY ---------- */
.day{padding:clamp(110px,15vw,200px) 0 clamp(110px,14vw,200px);background:var(--washi)}
.flow{margin:-30px auto clamp(70px,9vw,120px);max-width:1100px}
.flow ol{display:flex;flex-wrap:wrap;justify-content:center;gap:10px 0}
.flow li{display:flex;align-items:center;font-size:.95rem;letter-spacing:.06em}
.flow li+li::before{content:"→";margin:0 .7em;color:var(--shu);font-family:var(--sans);opacity:.8}
.flow a{text-decoration:none;padding:.35em .9em;border:1px solid var(--line);border-radius:999px;background:rgba(255,255,255,.4);transition:background .5s var(--ease),border-color .5s}
.flow a:hover{background:#fff;border-color:rgba(168,64,43,.4)}
.flow rt{font-size:.5em}
.timeline{position:relative}
.tl-line{position:absolute;left:50%;top:0;bottom:0;width:1px;background:var(--line);translate:-50% 0}
.tl-line i{position:absolute;inset:0;background:var(--shu);transform-origin:top;transform:scaleY(0);opacity:.7}
.step{position:relative;display:grid;grid-template-columns:1fr 1fr;gap:clamp(40px,8vw,140px);align-items:center;padding:clamp(36px,5vw,70px) 0}
.step::after{content:"";position:absolute;left:50%;top:50%;width:11px;height:11px;border-radius:50%;background:var(--washi);border:1px solid var(--shu);translate:-50% -50%}
.step-figure{margin:0}
.step-figure .frame{aspect-ratio:5/4;border-radius:2px;box-shadow:0 30px 60px -30px rgba(40,30,20,.35)}
.step-rev .step-figure{order:2}
.step-no{font-family:var(--sans);font-size:.75rem;letter-spacing:.3em;color:var(--shu);margin-bottom:.8rem}
.step-title{font-size:clamp(1.6rem,1.8vw + .9rem,2.6rem);line-height:1.6;letter-spacing:.08em}
.step-title rt{font-size:.38em}
.step-desc{margin-top:1.3rem;letter-spacing:.04em;line-height:2.1;max-width:28em}
.step-text .en{max-width:32em}
.words{margin-top:1.6rem;padding-top:1.1rem;border-top:1px solid var(--line);max-width:28em}
.words-label{font-family:var(--sans);font-size:.7rem;letter-spacing:.24em;color:var(--mute);margin-bottom:.6rem}
.words-label .en-inline{font-size:.95em}
.words ul{display:flex;flex-wrap:wrap;gap:8px 10px}
.words li{display:inline-flex;align-items:baseline;gap:.6em;padding:.2em .9em;background:#fff;border-radius:999px;border:1px solid var(--line);line-height:2}
.w-jp{font-size:1.02rem;letter-spacing:.06em}
.w-en{font-family:var(--sans);font-size:.75rem;color:var(--mute)}
.step-place{margin-top:1.1rem;font-family:var(--sans);font-size:.72rem;letter-spacing:.14em;color:var(--mute)}
.step-place rt{font-size:.62em}

/* ---------- TOWN interlude ---------- */
.town{position:relative;min-height:100vh;min-height:100svh;display:grid;place-items:center;overflow:hidden;isolation:isolate;text-align:center}
.town .media img{transform:scale(1.18)}
.town-inner{position:relative;z-index:2;padding:0 var(--gutter);text-shadow:0 2px 30px rgba(0,0,0,.45)}
.town-line{margin-top:2.4rem;font-size:clamp(1.15rem,1.4vw + .6rem,1.8rem);letter-spacing:.14em;line-height:2}

/* ---------- 07 PLACES ---------- */
.places{padding:clamp(110px,14vw,200px) 0 clamp(110px,14vw,180px);background:var(--ink-2)}
.places-head{display:flex;justify-content:space-between;align-items:flex-end;gap:30px}
.rail-controls{display:flex;gap:10px}
.rail-btn{width:52px;height:52px;border-radius:50%;border:1px solid var(--line-d);background:transparent;cursor:pointer;display:grid;place-items:center;transition:background .5s var(--ease),opacity .5s}
.rail-btn svg{width:20px;height:20px}
.rail-btn:hover{background:rgba(255,255,255,.08)}
.rail-btn:disabled{opacity:.3;cursor:default}
.rail{overflow-x:auto;overflow-y:hidden;scroll-snap-type:x mandatory;scrollbar-width:none;-webkit-overflow-scrolling:touch;
  padding-inline:max(var(--gutter), calc((100% - 1240px)/2));scroll-padding-inline:max(var(--gutter), calc((100% - 1240px)/2))}
.rail::-webkit-scrollbar{display:none}
.rail:focus-visible{outline-offset:-4px}
.rail ul{display:flex;gap:clamp(18px,2vw,28px);width:max-content;padding-bottom:10px}
.place{width:clamp(280px,30vw,420px);scroll-snap-align:start;flex:none}
.place-img{aspect-ratio:3/4;overflow:hidden;border-radius:2px;background:#222}
.place-img img{width:100%;height:100%;object-fit:cover;transition:transform 3s var(--ease)}
.place:hover .place-img img{transform:scale(1.06)}
.place-body{padding-top:1.6rem}
.place-pref{font-family:var(--sans);font-size:.72rem;letter-spacing:.2em;color:var(--gold)}
.place-pref rt{font-size:.62em}
.place-name{font-size:clamp(1.7rem,1.4vw + 1rem,2.4rem);letter-spacing:.1em;line-height:1.6;margin-top:.3rem}
.place-name rt{font-size:.36em}
.place-desc{margin-top:1rem;font-size:1rem;line-height:2.05;letter-spacing:.04em;color:rgba(255,255,255,.92)}
.place-cap{margin-top:1rem;font-family:var(--sans);font-size:.72rem;letter-spacing:.06em;color:rgba(255,255,255,.6);line-height:1.8}
.place-cap rt{font-size:.62em}

/* ---------- 08 ENDING ---------- */
.ending{position:relative;min-height:100vh;min-height:100svh;display:grid;place-items:center;overflow:hidden;isolation:isolate;text-align:center}
.ending .media img{transform:scale(1.12)}
.end-inner{position:relative;z-index:2;padding:120px var(--gutter);text-shadow:0 2px 30px rgba(0,0,0,.45)}
.ending .display{font-size:clamp(2.6rem,7vw,7rem)}
.end-quote{margin-top:3.4rem;font-size:clamp(1rem,.9vw + .6rem,1.35rem);letter-spacing:.1em;line-height:2.2}
.back-top{display:inline-block;margin-top:3rem;padding:.8em 1.8em;border:1px solid rgba(255,255,255,.5);border-radius:999px;text-decoration:none;font-size:.95rem;letter-spacing:.14em;transition:background .6s var(--ease)}
.back-top:hover{background:rgba(255,255,255,.12)}

/* ---------- footer ---------- */
.site-footer{padding:56px 0 calc(48px + env(safe-area-inset-bottom));border-top:1px solid var(--line-d);background:#0a0d0c}
.footer-inner{display:flex;flex-wrap:wrap;gap:24px 60px;justify-content:space-between;align-items:flex-start}
.footer-brand{display:flex;align-items:center;flex-wrap:wrap;gap:12px;letter-spacing:.14em}
.footer-brand .sy-logo{color:inherit;text-decoration:none;letter-spacing:normal}
.credits{flex:1 1 420px;max-width:760px;font-family:var(--sans);font-size:.78rem;color:rgba(255,255,255,.7)}
.credits summary{cursor:pointer;letter-spacing:.1em;list-style-position:outside}
.credits ul{margin-top:16px;columns:2 320px;column-gap:32px}
.credits li{break-inside:avoid;margin-bottom:8px;line-height:1.5}
.credits a{color:rgba(255,255,255,.86)}
.credits-note{margin-top:14px;opacity:.75}

/* =========================================================
   Responsive
   ========================================================= */
@media (max-width: 1024px){
  .what-grid{grid-template-columns:1fr}
  .what-figure .frame{aspect-ratio:16/11}
  .roten-detail{grid-template-columns:1fr}
  .roten-figure .frame{aspect-ratio:16/11}
}
@media (max-width: 820px){
  :root{--header-h:58px}
  .brand-name,.site-header .brand-divider{display:none}
  .toggle{padding:0 10px;gap:7px;font-size:.78rem}
  .toggle-switch{width:26px;height:16px}
  .toggle-switch span{width:12px;height:12px}
  .toggle[aria-pressed="true"] .toggle-switch span{transform:translateX(10px)}
  .toggle-state{display:none}
  .nature-grid{grid-template-columns:1fr}
  .n-card:nth-child(even),html.js .n-card:nth-child(even)[data-reveal].is-in{transform:none}
  html.js .n-card:nth-child(even)[data-reveal]{transform:translateY(28px)}
  .nature-grid{padding-bottom:0}
  .n-card figure{aspect-ratio:4/5}
  .roten-hero-inner{flex-direction:column;align-items:flex-start;justify-content:flex-end;min-height:100svh;padding:120px 0 80px}
  .vertical-title{writing-mode:horizontal-tb;font-size:clamp(2.8rem,12vw,4.4rem);letter-spacing:.12em}
  .vertical-title rt{font-size:.3em;letter-spacing:.12em}
  .roten-hero-inner{flex-direction:column-reverse}
  .scrim-left{background:linear-gradient(0deg,rgba(6,9,8,.88) 0%,rgba(6,9,8,.55) 45%,rgba(6,9,8,.15) 80%)}
  .seasons-inner{grid-template-columns:1fr;grid-template-rows:auto 1fr auto;padding-bottom:7vh}
  .season-nav{grid-column:1;grid-row:3;flex-direction:row;justify-content:flex-start;gap:4px;margin-top:18px}
  .season-nav button{padding:8px 6px;font-size:1rem}
  .season-nav button::before{width:10px}
  .season-nav button[aria-current="true"]::before{width:20px}
  .season-nav .en{display:none}
  .scrim-season{background:linear-gradient(0deg,rgba(5,7,7,.85) 0%,rgba(5,7,7,.45) 50%,rgba(5,7,7,.55) 100%)}
  .season-texts{min-height:15em}
  .tl-line,.step::after{left:18px}
  .step,.step-rev{grid-template-columns:1fr;gap:22px;padding-left:48px}
  .step-rev .step-figure{order:0}
  .step::after{top:calc(clamp(36px,5vw,70px) + 14px)}
  .flow{margin-top:-20px}
  .flow li{font-size:.85rem}
  .places-head{flex-direction:column;align-items:flex-start}
  .place{width:min(82vw,380px)}
  .photo-caption{bottom:14px;font-size:.66rem}
  .hero .photo-caption{display:none}
  .stats{gap:36px}
}
@media (max-width: 520px){
  .br-sm{display:inline}
  .display{letter-spacing:.04em}
  .hero .eyebrow{letter-spacing:.24em}
  .hero-sub{letter-spacing:.08em}
  .lead{margin-top:1.8rem}
  .toolbar{gap:2px;padding:4px}
  .brand-mark{width:30px;height:30px}
  .roten-points .kanji{font-size:1.6rem}
  .season-kanji{font-size:clamp(4.4rem,22vw,6rem)}
  .warmth-lines{height:11em}
  .credits ul{columns:1}
}
@media (min-width: 1600px){
  :root{--wrap:min(1360px, calc(100% - 2*var(--gutter)))}
}

/* =========================================================
   Reduced motion: no zoom, parallax, steam motion; instant reveals
   ========================================================= */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation:none !important;transition-duration:.01ms !important;transition-delay:0s !important}
  html.js [data-reveal],html.js .hero-in,html.js [data-line]{opacity:1 !important;transform:none !important}
  html.js .hero .media{opacity:1}
  .media img,.season-layer img,.what-figure .frame img,.n-img img{transform:none !important}
  .shimmer{display:none}
  .warmth{height:auto}
  .warmth .sticky{position:relative;height:auto;min-height:100svh}
  .warmth-lines{height:auto}
  .warmth-line{position:relative;margin-top:2rem}
}

/* --- polish pass --- */
.scrim-end{background:radial-gradient(ellipse 70% 55% at 50% 48%,rgba(4,8,14,.55) 0%,rgba(4,8,14,.25) 70%,rgba(4,8,14,0) 100%),linear-gradient(180deg,rgba(4,8,14,.5),rgba(4,8,14,.35) 40%,rgba(4,8,14,.72))}
.end-inner{text-shadow:0 1px 3px rgba(0,0,0,.55),0 2px 30px rgba(0,0,0,.5)}
.back-top .en-inline{white-space:nowrap}
:lang(ja) p,:lang(ja) h3{text-wrap:pretty}
@media (max-width:600px){
  .back-top{padding:.8em 2em;line-height:1.7}
  .back-top .en-inline{display:block;margin-left:0}
}
.season-nav button{color:rgba(255,255,255,.72);text-shadow:0 1px 2px rgba(0,0,0,.7),0 0 18px rgba(0,0,0,.55)}
.season-nav button::before{box-shadow:0 0 4px rgba(0,0,0,.6)}
.season-nav rt{font-size:.5em}
@media (min-width:821px){.season-nav{align-self:center;justify-self:end;padding:14px 22px 14px 14px;border-radius:18px;background:rgba(6,8,8,.32);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px)}}

@media (max-width: 520px){
  .site-header .sy-wordmark{display:none}
  .site-header .sy-mark{width:32px;height:32px;flex-basis:32px}
}

/* Back link to the onsen index */
.back-link{display:inline-flex;align-items:center;gap:.45em;padding:.42em .95em;border:1px solid currentColor;border-radius:999px;color:inherit;text-decoration:none;font-size:.82rem;letter-spacing:.02em;line-height:1.2;white-space:nowrap;opacity:.88;transition:opacity .2s ease,background-color .2s ease}
.back-link:hover{opacity:1;background:rgba(255,255,255,.12)}
.site-header.on-light .back-link:hover{background:rgba(0,0,0,.05)}
.back-link:focus-visible{outline:2px solid currentColor;outline-offset:3px;opacity:1}
.brand .back-link{margin-left:4px}
.footer-back{margin:0}
.site-header .toolbar{flex-shrink:0}
.toggle-label{white-space:nowrap}
.brand{min-width:0}
@media (max-width: 520px){.brand{gap:10px}.site-header .back-link{font-size:.76rem;padding:.38em .75em}.site-header .back-link-more{display:none}.toggle{padding:0 8px}}
@media (max-width: 400px){.toggle{padding:0 6px;gap:5px}.site-header .toolbar{gap:0;padding:3px}}
@media (max-width: 370px){.site-header .back-link-text{display:none}.site-header .back-link{width:32px;height:32px;padding:0;justify-content:center;font-size:.9rem}}
@media (prefers-reduced-motion: reduce){.back-link{transition:none}}

/* ---------- word glosses (tooltips) ---------- */
.gl{border-radius:.18em;-webkit-box-decoration-break:clone;box-decoration-break:clone;-webkit-tap-highlight-color:transparent;
  transition:background-color .2s var(--ease)}
.gl:not(.gl-in-control){cursor:help}
@media (hover:none){.gl:not(.gl-in-control){cursor:pointer}}
/* a quiet affordance only when a word is pointed at, focused or open */
.gl:hover,.gl:focus-visible,.gl.is-glossed{
  background-color:rgba(255,255,255,.12);
  background-color:color-mix(in srgb,currentColor 11%,transparent);
  background-image:linear-gradient(90deg,currentColor 45%,transparent 0);
  background-size:4px 1px;background-repeat:repeat-x;background-position:0 calc(100% - .02em)}
.theme-light .gl:hover,.theme-light .gl.is-glossed{background-color:rgba(29,27,24,.08)}
.theme-light .n-card .gl:hover,.theme-light .n-card .gl.is-glossed{background-color:rgba(255,255,255,.14)}
.gl:focus{outline:none}
.gl:focus-visible{outline:2px solid var(--gold);outline-offset:.1em}
.theme-light .gl:focus-visible{outline-color:var(--shu)}
.theme-light .n-card .gl:focus-visible{outline-color:#fff}
/* hidden overlapping lines in the sticky scenes must not catch the pointer */
@media (prefers-reduced-motion: no-preference){html.js .warmth-line:not(.is-on){pointer-events:none}}
.season-text.is-active{pointer-events:auto}

.gloss-tip{position:fixed;left:0;top:0;z-index:60;box-sizing:border-box;width:max-content;max-width:min(19rem,calc(100vw - 20px));
  display:flex;flex-direction:column;gap:.18rem;padding:.7rem .95rem .72rem;border-radius:14px;pointer-events:none;
  color:#f4f1ea;background:rgba(30,37,34,.96);-webkit-backdrop-filter:saturate(1.4) blur(18px);backdrop-filter:saturate(1.4) blur(18px);
  border:1px solid rgba(255,255,255,.18);box-shadow:0 18px 40px rgba(0,0,0,.38),0 2px 8px rgba(0,0,0,.22);
  text-align:left;text-shadow:none;letter-spacing:normal;line-height:1.4;writing-mode:horizontal-tb;
  opacity:0;transform:translateY(4px);transition:opacity .16s var(--ease),transform .2s var(--ease)}
.gloss-tip.is-below{transform:translateY(-4px)}
.gloss-tip.is-open{opacity:1;transform:none}
.gloss-tip[hidden]{display:none}
.gloss-tip.is-offscreen{visibility:hidden}
.gloss-tip__head{display:flex;align-items:baseline;flex-wrap:wrap;gap:.15rem .6rem}
.gloss-tip__jp{font-family:var(--serif);font-size:1.18rem;font-weight:600;letter-spacing:.06em;line-height:1.3}
.gloss-tip__kana{font-family:var(--sans);font-size:.78rem;letter-spacing:.08em;color:var(--gold)}
.gloss-tip__kana:empty{display:none}
.gloss-tip__en{font-family:var(--sans);font-size:.88rem;font-weight:450;line-height:1.45;color:rgba(255,255,255,.92);overflow-wrap:anywhere}
.gloss-tip__pos{font-family:var(--sans);font-size:.64rem;font-weight:600;letter-spacing:.16em;text-transform:uppercase;color:rgba(255,255,255,.6);margin-top:.12rem}
.gloss-tip__pos:empty{display:none}
.gloss-tip__arrow{position:absolute;top:100%;width:12px;height:12px;margin:-6px 0 0 -6px;transform:rotate(45deg);
  background:inherit;-webkit-backdrop-filter:none;backdrop-filter:none;border:inherit;border-top:0;border-left:0;border-radius:0 0 3px 0;
  background:rgb(30,37,34)}
.gloss-tip.is-below .gloss-tip__arrow{top:0;transform:rotate(225deg)}
/* paper version over the light (washi) sections */
.gloss-tip.on-light{color:var(--sumi);background:rgba(251,248,242,.94);border-color:rgba(29,27,24,.12);
  box-shadow:0 18px 40px rgba(29,27,24,.16),0 2px 8px rgba(29,27,24,.08)}
.gloss-tip.on-light .gloss-tip__kana{color:var(--shu)}
.gloss-tip.on-light .gloss-tip__en{color:var(--sumi)}
.gloss-tip.on-light .gloss-tip__pos{color:var(--mute)}
.gloss-tip.on-light .gloss-tip__arrow{background:rgb(251,248,242)}
@media (prefers-reduced-motion: reduce){.gloss-tip,.gloss-tip.is-below{transition:none;transform:none}.gl{transition:none}}
@media print{.gloss-tip{display:none !important}}