/* =========================================================
   Sauna Inc. — tokyo357.com
   サウナ室の温度をそのまま設計言語にする。
   熱＝つくる（アプリ開発） / 冷＝整える（ITコンサル）
   ========================================================= */

:root {
  /* 炭化した壁と檜 */
  --char:        #14100E;
  --char-2:      #1C1613;
  --wood:        #2B2119;
  --wood-line:   rgba(234, 221, 199, 0.09);

  /* 檜と灰 */
  --hinoki:      #EADDC7;
  --dim:         #A2957F;
  --faint:       #6E6355;

  /* 熾火 */
  --ember:       #E4572E;
  --loyly:       #F2B544;

  /* 水風呂 */
  --mizu:        #7FB0C0;
  --mizu-deep:   #0C1B21;
  --mizu-line:   rgba(127, 176, 192, 0.16);

  --font-display: "Yu Mincho", YuMincho, "Hiragino Mincho ProN", "HiraMinProN-W3", "Times New Roman", serif;
  --font-body: "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Yu Gothic", YuGothic, system-ui, -apple-system, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;

  --gut: clamp(20px, 5vw, 64px);
  --rail: 96px;
  --max: 1180px;
}

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background: var(--char);
  color: var(--hinoki);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.9;
  letter-spacing: 0.02em;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* 焼杉の壁：ごく薄い縦の木目 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background:
    repeating-linear-gradient(90deg, transparent 0 6px, var(--wood-line) 6px 7px, transparent 7px 41px),
    repeating-linear-gradient(90deg, transparent 0 137px, rgba(0,0,0,.28) 137px 139px);
  opacity: .5;
}

body > * { position: relative; z-index: 1; }

img, svg { max-width: 100%; display: block; }

a { color: var(--loyly); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--ember); }

:focus-visible {
  outline: 2px solid var(--loyly);
  outline-offset: 3px;
  border-radius: 2px;
}

.skip {
  position: absolute; left: 8px; top: -60px;
  background: var(--ember); color: #fff;
  padding: 10px 16px; z-index: 100;
  font-family: var(--font-mono); font-size: 13px;
  transition: top .18s;
}
.skip:focus { top: 8px; }

/* ---------- 共通レイアウト ---------- */

.wrap {
  width: 100%;
  max-width: var(--max);
  margin: 0 auto;
  padding-left: var(--gut);
  padding-right: var(--gut);
}

.band { padding: clamp(72px, 12vh, 132px) 0; position: relative; }
.band + .band { border-top: 1px solid rgba(234, 221, 199, 0.08); }

/* 水風呂セクション：ここで温度が反転する */
.band--cold {
  background: var(--mizu-deep);
  color: #DCEBF0;
  border-top: 1px solid var(--mizu-line);
}
.band--cold .eyebrow { color: var(--mizu); }
.band--cold .rule { background: var(--mizu-line); }
.band--cold .lede { color: #A9C6D0; }
.band--cold .card { border-color: var(--mizu-line); background: rgba(127, 176, 192, .05); }
.band--cold .card h3 { color: #DCEBF0; }
.band--cold .card p { color: #9DBAC5; }
.band--cold .card-mark { color: var(--mizu); }

/* ---------- 温度ラベル（構造装置） ---------- */

.eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--ember);
  margin: 0 0 18px;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 14px;
  text-transform: uppercase;
}
.eyebrow .temp { font-size: 15px; font-weight: 600; }
.eyebrow .label { color: var(--dim); letter-spacing: clamp(.12em, 1vw, .3em); }

.rule {
  height: 1px;
  background: rgba(234, 221, 199, 0.14);
  border: 0;
  margin: 0 0 clamp(28px, 5vw, 52px);
}

/* ---------- 見出し ---------- */

h1, h2, h3 { font-family: var(--font-display); font-weight: 600; line-height: 1.32; letter-spacing: .04em; margin: 0; }

.h-sec {
  font-size: clamp(28px, 4.4vw, 46px);
  margin: 0 0 20px;
}

.lede {
  max-width: 46em;
  color: var(--dim);
  font-size: clamp(15px, 1.5vw, 17px);
  margin: 0;
}

/* ---------- ヘッダー ---------- */

.site-head {
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  background: rgba(20, 16, 14, 0.78);
  border-bottom: 1px solid rgba(234, 221, 199, 0.08);
}
.site-head .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  height: 66px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 11px;
  text-decoration: none;
  color: var(--hinoki);
}
.brand:hover { color: var(--hinoki); }
.brand svg { width: 22px; height: 22px; flex: none; }
.brand b {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: .22em;
}

.nav { display: flex; gap: clamp(14px, 2.4vw, 30px); align-items: center; }
.nav a {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .1em;
  color: var(--dim);
  text-decoration: none;
  padding: 6px 0;
  border-bottom: 1px solid transparent;
}
.nav a:hover, .nav a[aria-current="page"] { color: var(--hinoki); border-bottom-color: var(--ember); }
@media (max-width: 620px) { .nav a.opt { display: none; } }

/* ---------- ヒーロー ---------- */

.hero {
  min-height: min(88vh, 780px);
  display: flex;
  align-items: center;
  padding: clamp(64px, 14vh, 130px) 0 clamp(56px, 10vh, 100px);
  position: relative;
  overflow: hidden;
}

/* ストーブの残り火 */
.hero::after {
  content: "";
  position: absolute;
  left: 50%; bottom: -46%;
  width: min(1100px, 150vw); aspect-ratio: 1;
  transform: translateX(-50%);
  background: radial-gradient(circle, rgba(228, 87, 46, .20) 0%, rgba(242, 181, 68, .07) 34%, transparent 66%);
  pointer-events: none;
}

.hero .wrap { position: relative; z-index: 2; }

.hero-mark {
  font-family: var(--font-mono);
  font-size: clamp(10px, 2.6vw, 12px);
  letter-spacing: clamp(.1em, 1vw, .3em);
  color: var(--ember);
  margin: 0 0 clamp(24px, 4vw, 40px);
  overflow-wrap: anywhere;
}
.hero-mark span { color: var(--faint); }

.hero h1 {
  font-size: clamp(46px, 11vw, 116px);
  line-height: 1.12;
  letter-spacing: .06em;
  margin: 0 0 clamp(26px, 4vw, 40px);
}
.hero h1 .cool { color: var(--mizu); }

.hero p {
  max-width: 34em;
  color: var(--dim);
  font-size: clamp(15px, 1.7vw, 18px);
  margin: 0 0 clamp(32px, 5vw, 46px);
}

.actions { display: flex; flex-wrap: wrap; gap: 14px; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .1em;
  padding: 14px 24px;
  text-decoration: none;
  border: 1px solid var(--ember);
  color: var(--char);
  background: var(--ember);
  transition: background .18s, color .18s, border-color .18s;
}
.btn:hover { background: var(--loyly); border-color: var(--loyly); color: var(--char); }

.btn--ghost { background: transparent; color: var(--hinoki); border-color: rgba(234, 221, 199, 0.3); }
.btn--ghost:hover { background: transparent; color: var(--loyly); border-color: var(--loyly); }

.btn--cold { background: var(--mizu); border-color: var(--mizu); color: var(--mizu-deep); }
.btn--cold:hover { background: #A6CBD7; border-color: #A6CBD7; color: var(--mizu-deep); }

/* ---------- 温度計レール（署名要素） ---------- */

.gauge {
  position: fixed;
  left: 26px;
  top: 0;
  height: 100vh;
  width: 62px;
  z-index: 30;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  pointer-events: none;
}
@media (max-width: 1080px) { .gauge { display: none; } }

.gauge-read {
  font-family: var(--font-mono);
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: .04em;
  color: var(--ember);
  white-space: nowrap;
  transition: color .5s ease;
}
.gauge-tube {
  flex: 0 1 46vh;
  width: 3px;
  background: rgba(234, 221, 199, 0.12);
  position: relative;
  overflow: hidden;
}
.gauge-fill {
  position: absolute;
  left: 0; bottom: 0; width: 100%;
  height: 12%;
  background: linear-gradient(to top, var(--ember), var(--loyly));
  transition: height .45s cubic-bezier(.22,.61,.36,1), background .5s ease;
}
.gauge-note {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .28em;
  color: var(--faint);
  writing-mode: vertical-rl;
}
.gauge[data-phase="cold"] .gauge-read { color: var(--mizu); }
.gauge[data-phase="cold"] .gauge-fill { background: linear-gradient(to top, #2E5C6B, var(--mizu)); }

@media (prefers-reduced-motion: reduce) {
  .gauge-fill { transition: none; }
}

/* ---------- カードグリッド ---------- */

.grid {
  display: grid;
  gap: 1px;
  background: rgba(234, 221, 199, 0.1);
  border: 1px solid rgba(234, 221, 199, 0.1);
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 260px), 1fr));
}
.band--cold .grid { background: var(--mizu-line); border-color: var(--mizu-line); }

.card {
  background: var(--char);
  padding: clamp(26px, 3.4vw, 38px);
}
.band--cold .card { background: var(--mizu-deep); }

.card-mark {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .22em;
  color: var(--ember);
  margin: 0 0 16px;
}
.card h3 { font-size: 20px; margin: 0 0 12px; }
.card p { margin: 0; color: var(--dim); font-size: 14.5px; line-height: 1.85; }

/* ---------- 制作物 ---------- */

.work {
  display: grid;
  grid-template-columns: minmax(0, 200px) minmax(0, 1fr);
  gap: clamp(28px, 5vw, 60px);
  align-items: center;
  border: 1px solid rgba(234, 221, 199, 0.12);
  padding: clamp(28px, 4vw, 46px);
  text-decoration: none;
  color: inherit;
  transition: border-color .2s, background .2s;
}
.work:hover { border-color: var(--ember); background: rgba(228, 87, 46, .04); color: inherit; }
@media (max-width: 700px) { .work { grid-template-columns: 1fr; } }

.work-art {
  aspect-ratio: 1;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2px;
  background: #1F3A2E;
  padding: 8px;
  border: 1px solid rgba(234, 221, 199, .14);
  max-width: 200px;
}
.work-art i {
  background: #24493A;
  border-radius: 50%;
  display: block;
  box-shadow: inset 0 0 0 1px rgba(0,0,0,.25);
}
.work-art i.b { background: #100E0D; }
.work-art i.w { background: #EADDC7; }

.work h3 { font-size: clamp(24px, 3.2vw, 34px); margin: 0 0 10px; }
.work .meta {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .16em;
  color: var(--ember);
  margin: 0 0 16px;
}
.work p { color: var(--dim); margin: 0 0 18px; font-size: 15px; }
.work .go { font-family: var(--font-mono); font-size: 12.5px; letter-spacing: .1em; color: var(--loyly); }

/* ---------- 定義テーブル（会社概要・アプリ情報） ---------- */

.facts {
  border-top: 1px solid rgba(234, 221, 199, 0.14);
  max-width: 780px;
}
.facts div {
  display: grid;
  grid-template-columns: minmax(0, 148px) minmax(0, 1fr);
  gap: 8px clamp(16px, 3vw, 36px);
  padding: 16px 0;
  border-bottom: 1px solid rgba(234, 221, 199, 0.14);
}
@media (max-width: 560px) { .facts div { grid-template-columns: 1fr; gap: 2px; } }
.facts dt {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .16em;
  color: var(--faint);
  padding-top: 4px;
  margin: 0;
}
.facts dd { margin: 0; font-size: 15px; }
.facts dd .sub { display: block; color: var(--faint); font-size: 13px; font-family: var(--font-mono); letter-spacing: .04em; }

/* ---------- 文書ページ（サポート／規約） ---------- */

.doc { padding: clamp(48px, 8vh, 84px) 0 clamp(72px, 12vh, 120px); }
.doc-head { max-width: 820px; margin: 0 0 clamp(40px, 6vw, 64px); }
.doc-head h1 { font-size: clamp(32px, 5.4vw, 54px); margin: 0 0 16px; }
.doc-head .updated { font-family: var(--font-mono); font-size: 12px; letter-spacing: .12em; color: var(--faint); }

.prose { max-width: 820px; }
.prose h2 {
  font-size: clamp(20px, 2.6vw, 26px);
  margin: clamp(44px, 6vw, 64px) 0 14px;
  padding-top: 22px;
  border-top: 1px solid rgba(234, 221, 199, 0.14);
}
.prose h2:first-child { margin-top: 0; border-top: 0; padding-top: 0; }
.prose h3 { font-size: 17px; margin: 30px 0 8px; color: var(--loyly); }
.prose p { margin: 0 0 16px; color: #D6C9B3; }
.prose ul, .prose ol { margin: 0 0 18px; padding-left: 1.3em; color: #D6C9B3; }
.prose li { margin-bottom: 8px; }
.prose strong { color: var(--hinoki); font-weight: 600; }

.note {
  border-left: 2px solid var(--ember);
  background: rgba(228, 87, 46, 0.06);
  padding: 20px 24px;
  margin: 0 0 28px;
}
.note p:last-child { margin-bottom: 0; }
.note .k {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--ember);
  display: block;
  margin-bottom: 8px;
}

/* 連絡先ブロック */
.contact-box {
  border: 1px solid rgba(234, 221, 199, 0.16);
  padding: clamp(26px, 4vw, 40px);
  display: grid;
  gap: 22px;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 200px), 1fr));
  margin: 0 0 34px;
}
.contact-box .k {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--faint);
  margin: 0 0 8px;
}
.contact-box .v { font-size: 17px; margin: 0; }
.contact-box .v a { font-family: var(--font-mono); font-size: 16px; word-break: break-all; }
.contact-box .v small { display: block; font-size: 13px; color: var(--dim); font-family: var(--font-body); margin-top: 6px; letter-spacing: 0; }

/* FAQ */
.faq { border-top: 1px solid rgba(234, 221, 199, 0.14); }
.faq details {
  border-bottom: 1px solid rgba(234, 221, 199, 0.14);
}
.faq summary {
  cursor: pointer;
  padding: 20px 34px 20px 0;
  position: relative;
  font-size: 16px;
  color: var(--hinoki);
  list-style: none;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+";
  position: absolute;
  right: 4px; top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  color: var(--ember);
  font-size: 18px;
}
.faq details[open] summary::after { content: "−"; }
.faq summary:hover { color: var(--loyly); }
.faq .a { padding: 0 0 22px; color: var(--dim); font-size: 15px; }
.faq .a p { margin: 0 0 12px; }
.faq .a p:last-child { margin-bottom: 0; }

/* 英語併記 */
.en-block {
  margin-top: clamp(56px, 9vw, 90px);
  padding-top: clamp(34px, 5vw, 48px);
  border-top: 2px solid var(--ember);
}
.en-block .flag {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .26em;
  color: var(--ember);
  margin: 0 0 18px;
}

/* ---------- フッター ---------- */

.site-foot {
  border-top: 1px solid rgba(234, 221, 199, 0.12);
  padding: clamp(48px, 8vw, 76px) 0 40px;
  background: var(--char-2);
}
.foot-top {
  display: flex;
  flex-wrap: wrap;
  gap: 32px;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 44px;
}
.foot-addr { font-family: var(--font-mono); font-size: 12.5px; line-height: 2.1; color: var(--faint); letter-spacing: .06em; }
.foot-addr b { display: block; color: var(--hinoki); letter-spacing: .2em; margin-bottom: 10px; font-weight: 600; }
.foot-nav { display: grid; gap: 10px; }
.foot-nav a {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .1em;
  color: var(--dim);
  text-decoration: none;
}
.foot-nav a:hover { color: var(--loyly); }
.foot-base {
  border-top: 1px solid rgba(234, 221, 199, 0.1);
  padding-top: 22px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--faint);
  display: flex;
  flex-wrap: wrap;
  gap: 12px 24px;
  justify-content: space-between;
}

/* ---------- 立ち上がりの演出 ---------- */

/* ---------- 余白ユーティリティ（インラインstyleを置かずCSPを 'self' で閉じるため） ---------- */

.mt-l { margin-top: clamp(34px, 5vw, 56px); }
.mt-m { margin-top: clamp(28px, 4vw, 44px); }
.mt-s { margin-top: 28px; }

.prose .en-block h2.lead { margin-top: 0; border-top: 0; padding-top: 0; }

/* ---------- 立ち上がりの演出 ---------- */

.rise { opacity: 0; transform: translateY(18px); }
.rise.in { opacity: 1; transform: none; transition: opacity .7s ease, transform .7s cubic-bezier(.22,.61,.36,1); }
@media (prefers-reduced-motion: reduce) {
  .rise, .rise.in { opacity: 1; transform: none; transition: none; }
}
.no-js .rise { opacity: 1; transform: none; }