/* =====================================================================
   SOKSON — Spiral redesign
   front-page.php 専用
   ---------------------------------------------------------------------
   Mobile-first pivot (2026-04-12): mobile = 中央単機 + 積層残り帯 + 沁み込み
                                    desktop (≥1024px) = 螺旋コサイン投影(STEP 1/2 凍結資産)
   ===================================================================== */

@property --base-rot    { syntax: '<angle>'; inherits: false; initial-value: 0deg; }
@property --scroll-rot  { syntax: '<angle>'; inherits: false; initial-value: 0deg; }
@property --inertia-rot { syntax: '<angle>'; inherits: false; initial-value: 0deg; }

/* =====================================================================
   M1.0.4 CSS variables — STEP M1-M3 横断
   M1.0.5 overscroll 制御 — pull-to-refresh / bounce / scroll chaining 抑止
   ===================================================================== */
:root {
  /* ─── viewport height fallback ────────────────────── */
  --vp-h: 100vh;

  /* ─── mobile central gear (STEP M1) ───────────────── */
  --gear-main-size: clamp(200px, min(70vw, 42dvh), 320px);
  --gear-main-x: 60%;
  --gear-main-y: 38dvh;
  --copy-bottom: max(env(safe-area-inset-bottom), 8dvh);

  /* ─── stacked strips (STEP M2, defined here for shared access) ── */
  --strip-h: clamp(48px, 8dvh, 72px);
  --strip-gap: 0px;
  --strip-count-max: 4;
  --strip-gear-size: clamp(36px, 6dvh, 52px);
  --strip-gear-offset: 12px;
  --strip-bg: oklch(18% 0.01 70 / 0.82);
  --strip-line: oklch(88% 0.10 88 / 0.3);

  /* ─── soaking (STEP M3) ───────────────────────────── */
  --vignette-max: 0.25;
  --density: 0;
  --gear-base: oklch(82% 0.02 70);
  --gold:      oklch(88% 0.10 88);

  /* ─── inertia ─────────────────────────────────────── */
  --inertia-half-life: 500ms;
}

@supports (height: 100dvh) {
  :root { --vp-h: 100dvh; }
}

@media (max-height: 700px) {
  :root {
    --strip-h: 48px;
    --strip-count-max: 3;
  }
}

html {
  /* M1.0.5: pull-to-refresh / bounce / chain 完全抑止 */
  overscroll-behavior: none;
  scroll-behavior: smooth;
}

body.page-front {
  /* R1 color system */
  --sks-bg: #0a0805;
  --sks-gold-g0: oklch(88% 0.10 88);
  --sks-gold-g1: oklch(82% 0.105 85);
  --sks-gold-g2: oklch(75% 0.108 82);
  --sks-gold-g3: oklch(66% 0.110 80);
  --sks-gold-g4: oklch(56% 0.11 78);
  --sks-stroke-w: clamp(0.5px, 0.15vmin, 1.5px);
  --sks-g0-duration: 20s;
  --sks-scroll-progress: 0;

  background: var(--sks-bg);
  color: var(--sks-gold-g0);
  /* M1.0.5: 念押し */
  overscroll-behavior-y: contain;
}

body.page-front .sks-spiral-root {
  position: relative;
  overflow: visible;
  /* M1.0.5: 内部スクロール時の親連鎖を止める */
  overscroll-behavior: contain;
}

/* =====================================================================
   Ambient fog — loader fog-wispy.webp の再利用
   画面全体に fixed で極薄 overlay、非常にゆっくり drift。
   mix-blend-mode: screen で黒地に金色の霧感を残しつつ文字可読性を確保。
   z-index:6 = gear3d canvas(10)より下、vignette/grain(0)より上、minimap(50)より下。
   ===================================================================== */
.sks-ambient-fog {
  position: fixed;
  inset: 0;
  z-index: 6;
  pointer-events: none;
  background: url('../images/loader/fog-wispy.webp') center/cover no-repeat;
  opacity: 0.055;
  mix-blend-mode: screen;
  will-change: background-position, transform;
  animation: sksAmbientFogDrift 96s ease-in-out infinite alternate;
}
@keyframes sksAmbientFogDrift {
  0%   { background-position: 42% 40%; transform: scale(1.02); }
  100% { background-position: 58% 60%; transform: scale(1.08); }
}

/* =====================================================================
   Gold dust — 画面全体を漂う金粒子(CSS-only、固定レイヤー)
   fog(z:6) の上、gear3d(z:10) の下 → 空間の奥行きを感じさせる。
   ===================================================================== */
.sks-gold-dust {
  position: fixed;
  inset: 0;
  z-index: 7;
  pointer-events: none;
  overflow: hidden;
}
.sks-gold-dust span {
  position: absolute;
  width: 2px;
  height: 2px;
  border-radius: 50%;
  background: radial-gradient(circle,
    rgba(239,205,147,0.7) 0%,
    rgba(196,154,93,0.3) 40%,
    transparent 70%);
  opacity: 0;
  animation: sksGoldDustFloat var(--dust-dur, 14s) ease-in-out infinite;
  animation-delay: var(--dust-delay, 0s);
}
.sks-gold-dust span:nth-child(1)  { left:  8%; top: 15%; --dust-dur: 16s; --dust-delay:   0s; --dust-dx:  20px; --dust-dy: -30px; }
.sks-gold-dust span:nth-child(2)  { left: 82%; top: 22%; --dust-dur: 14s; --dust-delay:   2s; --dust-dx: -25px; --dust-dy: -20px; }
.sks-gold-dust span:nth-child(3)  { left: 25%; top: 48%; --dust-dur: 18s; --dust-delay:   4s; --dust-dx:  15px; --dust-dy:  25px; }
.sks-gold-dust span:nth-child(4)  { left: 68%; top: 55%; --dust-dur: 12s; --dust-delay:   1s; --dust-dx: -18px; --dust-dy:  22px; }
.sks-gold-dust span:nth-child(5)  { left: 12%; top: 72%; --dust-dur: 15s; --dust-delay:   3s; --dust-dx:  22px; --dust-dy: -18px; }
.sks-gold-dust span:nth-child(6)  { left: 88%; top: 78%; --dust-dur: 17s; --dust-delay:   5s; --dust-dx: -20px; --dust-dy:  15px; }
.sks-gold-dust span:nth-child(7)  { left: 45%; top: 12%; --dust-dur: 13s; --dust-delay:   6s; --dust-dx: -15px; --dust-dy:  20px; }
.sks-gold-dust span:nth-child(8)  { left: 55%; top: 88%; --dust-dur: 19s; --dust-delay: 1.5s; --dust-dx:  18px; --dust-dy: -25px; }
.sks-gold-dust span:nth-child(9)  { left: 32%; top: 32%; --dust-dur: 11s; --dust-delay:   7s; --dust-dx: -22px; --dust-dy: -15px; width: 3px; height: 3px; }
.sks-gold-dust span:nth-child(10) { left: 72%; top: 38%; --dust-dur: 20s; --dust-delay: 3.5s; --dust-dx:  20px; --dust-dy:  18px; }
.sks-gold-dust span:nth-child(11) { left: 18%; top: 62%; --dust-dur: 16s; --dust-delay:   8s; --dust-dx: -16px; --dust-dy:  20px; }
.sks-gold-dust span:nth-child(12) { left: 92%; top: 48%; --dust-dur: 14s; --dust-delay: 2.5s; --dust-dx:  15px; --dust-dy: -22px; width: 3px; height: 3px; }

@keyframes sksGoldDustFloat {
  0%   { opacity: 0;    transform: translate(0, 0) scale(1); }
  15%  { opacity: 0.45; }
  50%  { transform: translate(var(--dust-dx, 20px), var(--dust-dy, -30px)) scale(0.8); }
  85%  { opacity: 0.45; }
  100% { opacity: 0;    transform: translate(calc(var(--dust-dx, 20px) * 0.5), calc(var(--dust-dy, -30px) * -0.7)) scale(1.1); }
}

/* =====================================================================
   Skip link (1.8.4 A11y)
   ===================================================================== */
.sks-skip-link {
  position: absolute;
  left: -9999px;
  top: auto;
  width: 1px;
  height: 1px;
  overflow: hidden;
}
.sks-skip-link:focus {
  position: fixed;
  left: 16px;
  top: 16px;
  width: auto;
  height: auto;
  padding: 10px 16px;
  background: var(--sks-bg);
  color: var(--sks-gold-g0);
  border: 1px solid var(--sks-gold-g0);
  z-index: 200;
  font-family: "Inter", sans-serif;
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  text-decoration: none;
}

/* =====================================================================
   M1.1 Mobile base — 5 階層 (00 HERO / 01 WHY / 02 WHAT / 03 HOW / 04 WHO)
   中央単機 + 縦組みコピー。
   ・section は非 sticky、min-height は dvh/vh fallback。
   ・section__inner は絶対配置の gear + 下端に寄せた copy。
   ・5 セクション分、色は変わるが寸法は共通。
   ===================================================================== */
.sks-section {
  position: relative;
  min-height: var(--vp-h);
  padding: 0;
  display: block;
  background: var(--sks-bg);
}

.sks-section__inner {
  position: relative;
  width: 100%;
  min-height: var(--vp-h);
  margin: 0;
  padding: max(env(safe-area-inset-top), 2dvh) 20px var(--copy-bottom);
  box-sizing: border-box;
  background: var(--sks-bg);
  /* 縦組み: gear が上、copy が下(絶対配置で調整する) */
  display: block;
}

/* M1.2 copy: mobile base — 下寄せ縦組み */
.sks-section__copy {
  position: absolute;
  left: 20px;
  right: 20px;
  bottom: var(--copy-bottom);
  width: auto;
  max-width: none;
  z-index: 1;
}

/* H3: HERO copy entrance — ローダーからの体験接続
   copy ブロック全体を 1 回で fadeUp。子要素の opacity はそのまま。 */
.sks-section--00 .sks-section__copy{
  opacity:0;transform:translateY(20px);
  animation:sksHeroCopyIn 1.2s cubic-bezier(0.16,1,0.3,1) 0.2s forwards;
}
@keyframes sksHeroCopyIn{
  from{opacity:0;transform:translateY(20px);}
  to{opacity:1;transform:translateY(0);}
}

.sks-section__kicker {
  font-family: "Inter", system-ui, sans-serif;
  font-weight: 400;
  font-size: 10px;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  opacity: 0.5;
  margin: 0 0 clamp(12px, 2dvh, 24px) 0;
}
.sks-section__kicker .num {
  display: inline-block;
  min-width: 2em;
  opacity: 0.85;
}

.sks-section__title {
  font-family: "Noto Serif JP", "Hiragino Mincho ProN", serif;
  font-weight: 300;
  font-size: clamp(28px, 7vw, 44px);
  line-height: 1.35;
  letter-spacing: 0.04em;
  margin: 0 0 clamp(12px, 2dvh, 22px) 0;
}
.sks-section__title em {
  font-style: normal;
  color: var(--sks-gold-g0);
}

.sks-section__sub {
  font-family: "Noto Serif JP", serif;
  font-weight: 300;
  font-size: clamp(13px, 3.6vw, 16px);
  letter-spacing: 0.12em;
  opacity: 0.75;
  margin: 0 0 clamp(8px, 1.2dvh, 14px) 0;
  line-height: 1.9;
}
.sks-section__credit {
  font-family: "Inter", sans-serif;
  font-size: 10px;
  letter-spacing: 0.2em;
  opacity: 0.4;
  margin: 0;
}

/* Section CTA — mobile base */
.sks-section__cta {
  margin: clamp(16px, 3dvh, 28px) 0 clamp(12px, 2dvh, 20px);
}
/* Desktop 専用 CTA — モバイルでは非表示 */
.sks-section__cta--desktop { display: none; }

/* M1.1.3 mobile gear: 中央 60% 右寄せの単機 */
.sks-gear {
  position: absolute;
  top: var(--gear-main-y);
  left: var(--gear-main-x);
  width: var(--gear-main-size);
  aspect-ratio: 1;
  transform: translate(-50%, -50%);
  overflow: visible;
  pointer-events: none;
  color: var(--sks-gear-color);
}

.sks-gear__spin {
  transform-box: fill-box;
  transform-origin: center center;
  transform: rotate(calc(var(--base-rot) + var(--scroll-rot) + var(--inertia-rot)));
  will-change: transform;
}

/* Per-section: color only on mobile base(寸法は共通) */
.sks-section--00 { --sks-gear-color: var(--sks-gold-g0); }
.sks-section--01 { --sks-gear-color: var(--sks-gold-g1); }
.sks-section--02 { --sks-gear-color: var(--sks-gold-g2); }
.sks-section--03 { --sks-gear-color: var(--sks-gold-g3); }
.sks-section--04 { --sks-gear-color: var(--sks-gold-g4); }

/* =====================================================================
   M3.1 Vignette — 沁み込み金ビネット
   各セクションの ::after で radial-gradient を重ねる。
   JS が --section-density (0..1) をセクションに設定し、
   opacity = density × vignette-max で金が端から沁み込む。
   ===================================================================== */
.sks-section::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(
    ellipse 70% 60% at var(--gear-main-x) var(--gear-main-y),
    transparent 15%,
    var(--gold) 100%
  );
  opacity: calc(var(--section-density, 0) * var(--vignette-max));
  pointer-events: none;
  z-index: 0;
  transition: opacity 800ms ease-out;
}

/* 3.1.3 Grain テクスチャ — 沁み込みに物質感を加える
   ::before で noise overlay。density に連動して grain も濃くなる。
   100×100 の SVG feTurbulence をデータ URI で埋め込み(外部ファイル不要)。 */
.sks-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='200' height='200'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.75' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='1'/%3E%3C/svg%3E");
  background-repeat: repeat;
  background-size: 200px 200px;
  opacity: calc(var(--section-density, 0) * 0.06);
  mix-blend-mode: overlay;
  pointer-events: none;
  z-index: 0;
  transition: opacity 800ms ease-out;
}

/* =====================================================================
   Investment margin elements — 歯車の余白に投資の気配
   Grid / Trace / Dust / Axis を歯車の背後に配置。
   全て opacity 0.03〜0.09 で grain/vignette と同レイヤー。
   ===================================================================== */
.sks-margin-grid{
  position:absolute;pointer-events:none;z-index:0;
  top:8vh;right:2%;
  width:clamp(300px,40vw,520px);height:clamp(250px,35vh,400px);
  /* D1: CSS background grid — SVG inline lines を不要にする */
  background:
    linear-gradient(rgba(196,154,93,0.075) 0.5px,transparent 0.5px),
    linear-gradient(90deg,rgba(196,154,93,0.075) 0.5px,transparent 0.5px);
  background-size:25% 25%;
  mask-image:radial-gradient(ellipse 70% 60% at 50% 50%,rgba(0,0,0,0.5) 0%,transparent 80%);
}
.sks-margin-trace{
  position:absolute;pointer-events:none;z-index:0;
  top:20vh;right:0;
  width:clamp(300px,45vw,600px);height:clamp(200px,40vh,400px);
}
.sks-margin-dust{
  position:absolute;pointer-events:none;z-index:0;
  top:10vh;right:3%;
  width:clamp(280px,36vw,480px);height:clamp(240px,34vh,380px);
}
.sks-margin-axis{
  position:absolute;pointer-events:none;z-index:0;
  top:12vh;right:clamp(16px,3vw,40px);
  width:20px;height:60vh;
}

/* Section-specific margin overrides */
/* 01 WHY — gear at ~71.2vw, margin elements slightly inboard */
.sks-margin-grid--01{top:10vh;right:4%;background-image:linear-gradient(rgba(196,154,93,0.07) 0.5px,transparent 0.5px),linear-gradient(90deg,rgba(196,154,93,0.07) 0.5px,transparent 0.5px);}
.sks-margin-trace--01{top:22vh;right:2%;}
.sks-margin-dust--01{top:12vh;right:4%;}

/* 02 WHAT — gear centered at 50vw, margins spread evenly */
.sks-margin-grid--02{top:6vh;right:auto;left:50%;transform:translateX(-50%);width:clamp(280px,38vw,480px);height:clamp(220px,30vh,360px);background-image:linear-gradient(rgba(196,154,93,0.06) 0.5px,transparent 0.5px),linear-gradient(90deg,rgba(196,154,93,0.06) 0.5px,transparent 0.5px);}
.sks-margin-trace--02{top:18vh;right:auto;left:50%;transform:translateX(-50%);width:clamp(260px,40vw,500px);}

/* 03 HOW — gear at ~28.8vw LEFT side, flip margins to left */
.sks-margin-grid--03{right:auto;left:2%;top:8vh;background-image:linear-gradient(rgba(196,154,93,0.06) 0.5px,transparent 0.5px),linear-gradient(90deg,rgba(196,154,93,0.06) 0.5px,transparent 0.5px);}
.sks-margin-trace--03{right:auto;left:0;top:20vh;}
.sks-margin-dust--03{right:auto;left:3%;top:10vh;}
.sks-margin-axis--03{right:auto;left:clamp(16px,3vw,40px);top:12vh;}

/* M2.3.1: 通過済みセクションの歯車を軽くフェード
   → セクションが上方へスクロールアウトする際に strip へ "吸い込まれる" 知覚 */
.sks-gear {
  transition: opacity 400ms ease-out, transform 400ms ease-out;
}
.sks-section.is-passed .sks-gear {
  opacity: 0.3;
  transform: translate(-50%, -50%) scale(0.7);
}

/* M1.3: section__strip は desktop STEP 2 の装飾。mobile では非表示 */
.sks-section__strip { display: none; }

/* A1: 投資マージン要素はモバイルでは非表示
   モバイルは歯車が中央に大きく配置されるため「余白」がほぼなく、
   grid/trace/dust/axis が重なって視認性を損なう。desktop 専用装飾。 */
.sks-margin-grid,
.sks-margin-trace,
.sks-margin-dust,
.sks-margin-axis { display: none; }

/* =====================================================================
   P1 PRODUCTS spiral cards — mobile base
   Section 02 を拡張し、プロダクトカードが螺旋軌道上に出現。
   ===================================================================== */

/* Section 02: copy を上寄せ、products をその下に流す */
.sks-section--02 {
  min-height: calc(var(--vp-h) + var(--product-count, 2) * 320px);
}
.sks-section--02 .sks-section__inner {
  min-height: auto;
  display: flex;
  flex-direction: column;
  align-items: stretch;
}
.sks-section--02 .sks-section__copy {
  position: relative;
  left: auto;
  right: auto;
  bottom: auto;
  padding-top: max(env(safe-area-inset-top), 12dvh);
  margin-bottom: clamp(32px, 6dvh, 60px);
}
.sks-section--02 .sks-gear,
.sks-section--02.is-passed .sks-gear {
  opacity: 0.12;
}

/* Products container */
.sks-products {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: clamp(24px, 5dvh, 48px);
  padding: 0 0 clamp(40px, 8dvh, 80px);
  z-index: 1;
}

/* Product card — spiral entrance */
.sks-product {
  position: relative;
  padding: clamp(20px, 4vw, 32px);
  border: 1px solid oklch(88% 0.10 88 / 0.12);
  border-radius: 12px;
  background: oklch(12% 0.01 70 / 0.6);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  opacity: 0;
  transform: translateX(var(--product-offset-x, 30%)) rotate(var(--product-rot, 6deg));
  transition:
    opacity 600ms cubic-bezier(0.22, 0.61, 0.36, 1),
    transform 600ms cubic-bezier(0.22, 0.61, 0.36, 1);
}
.sks-product:nth-child(odd)  { --product-offset-x: -30%; --product-rot: -6deg; }
.sks-product:nth-child(even) { --product-offset-x:  30%; --product-rot:  6deg; }
.sks-product.is-visible {
  opacity: 1;
  transform: translateX(0) rotate(0deg);
}

/* Header: gear + meta */
.sks-product__header {
  display: flex;
  align-items: center;
  gap: clamp(12px, 3vw, 20px);
  margin-bottom: clamp(12px, 2dvh, 20px);
}

.sks-product__gear {
  width: clamp(48px, 12vw, 72px);
  aspect-ratio: 1;
  flex-shrink: 0;
  color: var(--sks-gold-g2);
  overflow: visible;
}

/* Product gear rotation — independent of section gears */
@keyframes sks-product-rotate {
  from { transform: rotate(0deg); }
  to   { transform: rotate(360deg); }
}
.sks-product__gear .sks-gear__spin {
  animation: sks-product-rotate 25s linear infinite;
}
.sks-product:nth-child(even) .sks-product__gear .sks-gear__spin {
  animation-direction: reverse;
  animation-duration: 20s;
}

.sks-product__meta {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.sks-product__status {
  font-family: "Inter", system-ui, sans-serif;
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
}
.sks-product__status--active  { color: oklch(82% 0.12 145); }
.sks-product__status--planned { color: oklch(70% 0.08 88); opacity: 0.7; }

.sks-product__name {
  font-family: "Inter", system-ui, sans-serif;
  font-weight: 600;
  font-size: clamp(20px, 5vw, 28px);
  letter-spacing: 0.08em;
  margin: 0;
  color: var(--sks-gold-g0);
}

.sks-product__tagline {
  font-family: "Noto Serif JP", serif;
  font-weight: 300;
  font-size: clamp(14px, 3.8vw, 17px);
  letter-spacing: 0.08em;
  opacity: 0.85;
  margin: 0 0 clamp(8px, 1.5dvh, 14px);
  line-height: 1.7;
}

.sks-product__desc {
  font-family: "Noto Serif JP", serif;
  font-weight: 300;
  font-size: clamp(12px, 3.2vw, 14px);
  letter-spacing: 0.06em;
  opacity: 0.65;
  margin: 0 0 clamp(12px, 2dvh, 20px);
  line-height: 1.8;
}

.sks-product__features {
  list-style: none;
  padding: 0;
  margin: 0 0 clamp(12px, 2dvh, 16px);
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.sks-product__features li {
  font-family: "Inter", system-ui, sans-serif;
  font-size: clamp(11px, 2.8vw, 13px);
  letter-spacing: 0.04em;
  opacity: 0.6;
  padding-left: 16px;
  position: relative;
}
.sks-product__features li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.6em;
  width: 6px;
  height: 6px;
  border: 1px solid var(--sks-gold-g2);
  border-radius: 50%;
}

.sks-product__link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: "Inter", system-ui, sans-serif;
  font-size: clamp(12px, 3vw, 14px);
  font-weight: 500;
  letter-spacing: 0.1em;
  color: var(--sks-gold-g0);
  text-decoration: none;
  opacity: 0.8;
  transition: opacity 240ms ease-out;
}
.sks-product__link:hover,
.sks-product__link:focus-visible {
  opacity: 1;
}
.sks-product__link:focus-visible {
  outline: 1px solid var(--sks-gold-g0);
  outline-offset: 4px;
  border-radius: 2px;
}

/* =====================================================================
   M2 Strip tray — モバイル積層残り帯
   画面上端から下へ通過済みセクションが積み上がる。
   デフォルトで 4 strip(g0-g3)、短端末で 3 strip。g4 は積層対象外。
   ===================================================================== */
.sks-strip-tray {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  pointer-events: none;
  z-index: 30;
  /* strip 本体はこの tray に相対ではなく fixed + top calc で積む */
}

.sks-strip {
  position: fixed;
  top: calc(var(--strip-i, 0) * var(--strip-h));
  left: 0;
  right: 0;
  height: var(--strip-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px 0 20px;
  background: var(--strip-bg);
  border-bottom: 1px solid var(--strip-line);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  pointer-events: none;
  color: var(--sks-strip-color, var(--sks-gold-g0));
  /* 初期は画面外(上)に隠す */
  transform: translateY(-110%);
  opacity: 0;
  transition:
    transform 480ms cubic-bezier(0.22, 0.61, 0.36, 1),
    opacity 320ms ease-out;
}

.sks-strip.is-active {
  transform: translateY(0);
  opacity: 1;
}

/* 4 段目が溢れる短端末: --strip-count-max = 3 のとき、idx=3 (4 段目) は抑止 */
@media (max-height: 700px) {
  .sks-strip[data-idx="3"] { display: none; }
}

/* per-strip の色指定 + strip-i 位置 */
.sks-strip[data-idx="0"] { --strip-i: 0; --sks-strip-color: var(--sks-gold-g0); }
.sks-strip[data-idx="1"] { --strip-i: 1; --sks-strip-color: var(--sks-gold-g1); }
.sks-strip[data-idx="2"] { --strip-i: 2; --sks-strip-color: var(--sks-gold-g2); }
.sks-strip[data-idx="3"] { --strip-i: 3; --sks-strip-color: var(--sks-gold-g3); }

.sks-strip__label {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  font-family: "Inter", system-ui, sans-serif;
  font-weight: 400;
  white-space: nowrap;
}
.sks-strip__num {
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.2em;
  opacity: 0.85;
}
.sks-strip__name {
  font-size: 9px;
  letter-spacing: 0.22em;
  opacity: 0.55;
  text-transform: uppercase;
}

.sks-strip__gear {
  position: relative;
  width: var(--strip-gear-size);
  height: var(--strip-gear-size);
  aspect-ratio: 1;
  margin-right: calc(var(--strip-gear-offset, 12px) - 16px);
  overflow: visible;
  color: var(--sks-strip-color, var(--sks-gold-g0));
  pointer-events: none;
}

/* =====================================================================
   Gear base / scroll / inertia animation composition(mobile / desktop 共有)
   ===================================================================== */
@keyframes sks-base-g0 { from { --base-rot: 0deg; } to { --base-rot: 360deg; } }
@keyframes sks-base-g1 { from { --base-rot: 0deg; } to { --base-rot: -360deg; } }
@keyframes sks-base-g2 { from { --base-rot: 0deg; } to { --base-rot: 360deg; } }
@keyframes sks-base-g3 { from { --base-rot: 0deg; } to { --base-rot: -360deg; } }
@keyframes sks-base-g4 { from { --base-rot: 0deg; } to { --base-rot: 360deg; } }

@keyframes sks-scroll-g0 { from { --scroll-rot: 0deg; } to { --scroll-rot:  1080deg; } }
@keyframes sks-scroll-g1 { from { --scroll-rot: 0deg; } to { --scroll-rot: -1350deg; } }
@keyframes sks-scroll-g2 { from { --scroll-rot: 0deg; } to { --scroll-rot:  1620deg; } }
@keyframes sks-scroll-g3 { from { --scroll-rot: 0deg; } to { --scroll-rot: -2025deg; } }
@keyframes sks-scroll-g4 { from { --scroll-rot: 0deg; } to { --scroll-rot:  2700deg; } }

.sks-spin-g0 { animation: sks-base-g0 var(--sks-g0-duration)                linear infinite; }
.sks-spin-g1 { animation: sks-base-g1 calc(var(--sks-g0-duration) / 1.25)   linear infinite; }
.sks-spin-g2 { animation: sks-base-g2 calc(var(--sks-g0-duration) / 1.5)    linear infinite; }
.sks-spin-g3 { animation: sks-base-g3 calc(var(--sks-g0-duration) / 1.875)  linear infinite; }
.sks-spin-g4 { animation: sks-base-g4 calc(var(--sks-g0-duration) / 2.5)    linear infinite; }

@supports (animation-timeline: scroll()) {
  body.page-front:not(.sks-force-fallback) .sks-spin-g0 {
    animation:
      sks-base-g0 var(--sks-g0-duration) linear infinite,
      sks-scroll-g0 linear;
    animation-timeline: auto, scroll(root block);
  }
  body.page-front:not(.sks-force-fallback) .sks-spin-g1 {
    animation:
      sks-base-g1 calc(var(--sks-g0-duration) / 1.25) linear infinite,
      sks-scroll-g1 linear;
    animation-timeline: auto, scroll(root block);
  }
  body.page-front:not(.sks-force-fallback) .sks-spin-g2 {
    animation:
      sks-base-g2 calc(var(--sks-g0-duration) / 1.5) linear infinite,
      sks-scroll-g2 linear;
    animation-timeline: auto, scroll(root block);
  }
  body.page-front:not(.sks-force-fallback) .sks-spin-g3 {
    animation:
      sks-base-g3 calc(var(--sks-g0-duration) / 1.875) linear infinite,
      sks-scroll-g3 linear;
    animation-timeline: auto, scroll(root block);
  }
  body.page-front:not(.sks-force-fallback) .sks-spin-g4 {
    animation:
      sks-base-g4 calc(var(--sks-g0-duration) / 2.5) linear infinite,
      sks-scroll-g4 linear;
    animation-timeline: auto, scroll(root block);
  }
}

/* =====================================================================
   Gear visual styling(shared)
   ===================================================================== */
.sks-gear__path {
  fill: none;
  stroke: currentColor;
  stroke-width: var(--sks-stroke-w);
  stroke-linejoin: round;
  stroke-linecap: round;
}
.sks-gear__path.is-glow {
  filter: drop-shadow(0 0 8px oklch(88% 0.10 88 / 0.35));
}
.sks-gear__inner {
  fill: none;
  stroke: currentColor;
  stroke-width: var(--sks-stroke-w);
  opacity: 0.35;
}
.sks-gear__shaft { fill: currentColor; }

/* =====================================================================
   Progress bar (top of viewport)
   ===================================================================== */
.sks-progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: oklch(88% 0.10 88 / 0.08);
  z-index: 100;
  pointer-events: none;
}
.sks-progress-bar::after {
  content: '';
  display: block;
  height: 100%;
  width: 100%;
  background: var(--sks-gold-g0);
  transform-origin: left center;
  transform: scaleX(var(--sks-scroll-progress));
}
@supports (animation-timeline: scroll()) {
  body.page-front:not(.sks-force-fallback) .sks-progress-bar::after {
    transform: scaleX(0);
    animation: sks-progress-scale linear;
    animation-timeline: scroll(root block);
  }
}
@keyframes sks-progress-scale {
  from { transform: scaleX(0); }
  to   { transform: scaleX(1); }
}

/* =====================================================================
   M1.1 Mobile minimap — 底辺 5 ドットの横並び
   M1.2.3 タップ領域 44×44 保証
   ・mobile / tablet: 下端横並び
   ・desktop (≥1024px): 左下縦並び(後段 @media で上書き)
   ===================================================================== */
.sks-minimap {
  position: fixed;
  left: 50%;
  bottom: max(env(safe-area-inset-bottom), 12px);
  transform: translateX(-50%);
  z-index: 50;
  display: flex;
  flex-direction: row;
  gap: 0;
  padding: 6px 8px;
  background: oklch(8% 0.01 88 / 0.55);
  border: 1px solid oklch(88% 0.10 88 / 0.08);
  border-radius: 24px;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  pointer-events: auto;
  margin: 0;
}

.sks-minimap__item {
  all: unset;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  /* M1.2.3 タップ領域 44×44 */
  min-width: 44px;
  min-height: 44px;
  opacity: 0.42;
  transition: opacity 320ms ease-out;
}
.sks-minimap__item:hover {
  opacity: 0.85;
}
.sks-minimap__item.is-current {
  opacity: 1;
}
.sks-minimap__item.is-stacked {
  opacity: 0.72;
}
.sks-minimap__item:focus-visible {
  outline: 1px solid var(--sks-gold-g0);
  outline-offset: 2px;
  border-radius: 22px;
}

/* mobile: gear-slot と label は隠して単純なドット化 */
.sks-minimap__gear-slot { display: none; }
.sks-minimap__label { display: none; }

/* M3.5 mobile minimap: メスシリンダー化
   各ドットを縦バー(16px)にし、金液面で density を可視化。
   底からゴールドが上がる。 */
.sks-minimap__item::after {
  content: '';
  display: block;
  width: 4px;
  height: 16px;
  border-radius: 2px;
  background: linear-gradient(
    to top,
    var(--gold) calc(var(--dot-density, 0) * 100%),
    oklch(88% 0.10 88 / 0.2) calc(var(--dot-density, 0) * 100%)
  );
  transition: background 800ms ease-out, box-shadow 320ms ease-out;
}
.sks-minimap__item.is-current::after {
  box-shadow: 0 0 6px oklch(88% 0.10 88 / 0.6);
  width: 5px;
}

/* M1.3: 以下は desktop @media で完全に上書きされるため、
   mobile では ::before の左端金線も無効(stacked のみ ::after で表現) */
.sks-minimap__item.is-stacked::before { display: none; }

/* per-section mini-size/color は desktop 限定なので、
   mobile ではドット単一スタイルで共通。
   ただしカラー変数は JS の位相同期に影響しないので残して良い。 */
.sks-minimap__item[data-target="#hero"] { --sks-mini-color: var(--sks-gold-g0); }
.sks-minimap__item[data-target="#why"]  { --sks-mini-color: var(--sks-gold-g1); }
.sks-minimap__item[data-target="#what"] { --sks-mini-color: var(--sks-gold-g2); }
.sks-minimap__item[data-target="#how"]  { --sks-mini-color: var(--sks-gold-g3); }
.sks-minimap__item[data-target="#who"]  { --sks-mini-color: var(--sks-gold-g4); }

/* =====================================================================
   Reduced-motion fallback — 1.8.3 展開図モード(shared)
   ===================================================================== */
@media (prefers-reduced-motion: reduce) {
  .sks-gear__spin {
    animation: none !important;
    --base-rot: 0deg;
    --scroll-rot: 0deg;
    --inertia-rot: 0deg;
  }
  .sks-progress-bar::after {
    animation: none !important;
    transform: scaleX(var(--sks-scroll-progress, 0));
  }
  .sks-minimap__item {
    transition: none;
  }
  .sks-ceiling-gear {
    transition: none !important;
  }
  /* M2.3.2: strip も即時切替(フェードアニメ無効) */
  .sks-strip {
    transition: none !important;
  }
  /* M2.3.2: gear の is-passed フェードも無効 */
  .sks-gear {
    transition: none !important;
  }
  /* M3: vignette と minimap の transition も無効 */
  .sks-section::after {
    transition: none !important;
  }
  .sks-minimap__item::after {
    transition: none !important;
  }
  /* 3.1.3: grain も無効 */
  .sks-section::before {
    display: none;
  }
  /* P1: product card entrance も無効 */
  .sks-product {
    opacity: 1;
    transform: none;
    transition: none !important;
  }
  .sks-product__gear .sks-gear__spin {
    animation: none !important;
  }
  /* Phase 1-2: ambient fog の drift 無効化(静止で残す) */
  .sks-ambient-fog {
    animation: none !important;
  }
  /* Phase 1-3: gold dust は非表示(周辺視野のチラつきを避ける) */
  .sks-gold-dust {
    display: none !important;
  }
  html { scroll-behavior: auto; }
}

/* =====================================================================
   Tablet enhancement (641-1023px)
   mobile base を継承しつつ、広い画面を活かす微調整。
   ===================================================================== */
@media (min-width: 641px) and (max-width: 1023px) {
  .sks-section__inner {
    padding-left: clamp(20px, 5vw, 60px);
    padding-right: clamp(20px, 5vw, 60px);
  }
  .sks-section__copy {
    left: clamp(20px, 5vw, 60px);
    right: clamp(20px, 5vw, 60px);
    max-width: 560px;
  }
  .sks-section__title {
    font-size: clamp(34px, 5.2vw, 48px);
  }
}

/* =====================================================================
   DESKTOP LAYER (≥1024px) — 🧊 STEP 1/2 凍結資産
   ---------------------------------------------------------------------
   ここから下は既存 STEP 1 連動歯車 / STEP 2 積層の実装そのまま。
   mobile / tablet では発動しない。広幅で螺旋コサイン投影が復活する。
   ===================================================================== */
@media (min-width: 1024px) {

  /* M2 strip-tray はモバイル専用。desktop では CEILING + STEP 2 積層が使われる */
  .sks-strip-tray { display: none; }

  body.page-front .sks-spiral-root {
    /* 最後のセクションが sticky のまま読めるよう padding-bottom バッファ */
    padding-bottom: 100vh;
  }

  /* ─── STEP 2 sticky stacking ────────────────────────── */
  .sks-section {
    position: sticky;
    min-height: 100vh;
  }
  .sks-section--00 { --stack-i: 0; top: 0;    z-index: 10; }
  .sks-section--01 { --stack-i: 1; top: 5vh;  z-index: 11; }
  .sks-section--02 { --stack-i: 2; top: 10vh; z-index: 12; }
  .sks-section--03 { --stack-i: 3; top: 15vh; z-index: 13; }
  .sks-section--04 { --stack-i: 4; top: 20vh; z-index: 14; }

  .sks-section__inner {
    width: min(100%, 1280px);
    min-height: unset;
    height: calc(100vh - var(--stack-i, 0) * 5vh);
    margin: 0 auto;
    padding: 0 clamp(24px, 5vw, 80px);
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
  }

  /* ─── STEP 2 ceiling strip (label tray at top of each section) ─── */
  .sks-section__strip {
    display: flex;
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 5vh;
    min-height: 36px;
    align-items: center;
    gap: clamp(6px, 0.8vw, 12px);
    padding: 0 clamp(24px, 5vw, 80px);
    pointer-events: none;
    font-family: "Inter", system-ui, sans-serif;
    font-weight: 400;
    font-size: 10px;
    letter-spacing: 0.22em;
    text-transform: uppercase;
    color: var(--sks-gear-color, var(--sks-gold-g0));
    background: linear-gradient(
      to bottom,
      var(--sks-bg) 0%,
      oklch(8% 0.01 88 / 0.82) 60%,
      transparent 100%
    );
    border-bottom: 1px solid oklch(88% 0.10 88 / 0.08);
    opacity: var(--sks-strip-opacity, 0.65);
    z-index: 2;
  }
  .sks-section__strip-num { font-weight: 500; min-width: 2em; opacity: 0.9; }
  .sks-section__strip-name { opacity: 0.6; }
  .sks-section--00 .sks-section__strip { --sks-strip-opacity: 0.55; }
  .sks-section--01 .sks-section__strip { --sks-strip-opacity: 0.60; }
  .sks-section--02 .sks-section__strip { --sks-strip-opacity: 0.68; }
  .sks-section--03 .sks-section__strip { --sks-strip-opacity: 0.78; }
  .sks-section--04 .sks-section__strip { --sks-strip-opacity: 0.90; }

  /* ─── STEP 1 cosine copy layout ────────────────────────── */
  .sks-section__copy {
    position: relative;
    left: auto;
    right: auto;
    bottom: auto;
    padding-bottom: clamp(40px, 6vh, 80px);
    width: min(85%, 720px);
    max-width: 720px;
    z-index: 1;
  }

  /* コピー位置の交互配置 — 視線にリズムを作る */
  .sks-section--00 .sks-section__inner { justify-content: center; }
  /* 01 = flex-end (デフォルト) */
  .sks-section--02 .sks-section__inner { justify-content: center; }
  /* 03 = flex-end (デフォルト) */
  .sks-section--04 .sks-section__inner { justify-content: center; }
  .sks-section__title {
    font-size: clamp(32px, 4.5vw, 72px);
  }
  .sks-section__sub {
    font-size: clamp(14px, 1.3vw, 20px);
  }
  /* D3: 実用的タイトル(「お問い合わせ」等)は一段控えめに */
  .sks-section__title--compact {
    font-size: clamp(24px, 3.2vw, 48px);
    letter-spacing: 0.08em;
  }
  /* Section CTA ボタン — desktop 位置調整 */
  .sks-section__cta {
    margin-top: clamp(16px, 2vh, 28px);
    margin-bottom: clamp(12px, 1.5vh, 20px);
  }
  .sks-section__cta--desktop { display: inline-flex; }

  /* ─── STEP 1 cosine gear positioning ─────────────────── */
  .sks-gear {
    top: var(--sks-gear-top, 18vh);
    left: var(--sks-gear-x);
    width: var(--sks-gear-size);
    transform: translateX(-50%);
  }

  /* Per-section: cosine X + size (R1 確定値) + M3 vignette 中心を cosine X に合わせ */
  .sks-section--00 {
    --sks-gear-x:     clamp(65%, 80vw, 92%);
    --sks-gear-size:  clamp(200px, 26vw, 320px);
    --gear-main-x:    clamp(65%, 80vw, 92%);
    --gear-main-y:    18vh;
  }
  .sks-section--01 {
    --sks-gear-x:     clamp(58%, 71.2vw, 82%);
    --sks-gear-size:  clamp(170px, 21vw, 260px);
    --gear-main-x:    clamp(58%, 71.2vw, 82%);
    --gear-main-y:    18vh;
  }
  .sks-section--02 {
    --sks-gear-x:     50vw;
    --sks-gear-size:  clamp(140px, 17vw, 220px);
    --gear-main-x:    50vw;
    --gear-main-y:    18vh;
  }
  .sks-section--02 .sks-gear,
  .sks-section--02.is-passed .sks-gear {
    opacity: 0.08;
  }

  /* A2: Section 02 の mobile 用 min-height 拡張をリセット — sticky モデルと整合させる */
  .sks-section--02 {
    min-height: 100vh;
  }
  .sks-section--02 .sks-section__inner {
    min-height: unset;
    display: flex;
    flex-direction: column;
    justify-content: center;
  }
  .sks-section--02 .sks-section__copy {
    position: relative;
    left: auto;
    right: auto;
    bottom: auto;
    padding-top: 0;
    margin-bottom: 0;
  }

  /* P1: products は mobile 専用。desktop は sticky スタッキングを維持し Products ページに委譲 */
  .sks-products {
    display: none;
  }

  /* A1: 投資マージン要素を desktop で表示復帰 */
  /* ワイドモニターで inner (1280px) から乖離しないよう max-width で制限 */
  .sks-margin-grid,
  .sks-margin-trace,
  .sks-margin-dust,
  .sks-margin-axis {
    display: block;
    max-width: min(100%, 1280px);
  }

  .sks-section--03 {
    --sks-gear-x:     clamp(18%, 28.8vw, 42%);
    --sks-gear-size:  clamp(115px, 14vw, 180px);
    --gear-main-x:    clamp(18%, 28.8vw, 42%);
    --gear-main-y:    18vh;
  }
  .sks-section--04 {
    --sks-gear-x:     clamp(8%, 20vw, 35%);
    --sks-gear-size:  clamp(95px, 11vw, 140px);
    --gear-main-x:    clamp(8%, 20vw, 35%);
    --gear-main-y:    18vh;
  }

  /* ─── STEP 2 ceiling gear tray ───────────────────────── */
  .sks-ceiling {
    display: block;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 20vh;
    pointer-events: none;
    z-index: 18;
  }
  .sks-ceiling-gear {
    position: absolute;
    left: var(--sks-gear-x);
    top: calc(var(--ceiling-slot, 0) * 5vh + 2.5vh);
    width: var(--ceiling-gear-size, 80px);
    aspect-ratio: 1;
    transform: translate(-50%, -50%) scale(var(--ceiling-scale, 0.3));
    transform-origin: center center;
    overflow: visible;
    color: var(--ceiling-gear-color, var(--sks-gold-g0));
    opacity: 0;
    transition:
      opacity 480ms cubic-bezier(0.22, 0.61, 0.36, 1),
      transform 520ms cubic-bezier(0.22, 0.61, 0.36, 1);
  }
  .sks-ceiling-gear.is-active {
    opacity: 1;
    transform: translate(-50%, -50%) scale(0.45);
  }
  .sks-ceiling-gear--g0 {
    --ceiling-slot: 0;
    --sks-gear-x:     clamp(65%, 80vw, 92%);
    --ceiling-gear-size:  clamp(200px, 26vw, 320px);
    --ceiling-gear-color: var(--sks-gold-g0);
  }
  .sks-ceiling-gear--g1 {
    --ceiling-slot: 1;
    --sks-gear-x:     clamp(58%, 71.2vw, 82%);
    --ceiling-gear-size:  clamp(170px, 21vw, 260px);
    --ceiling-gear-color: var(--sks-gold-g1);
  }
  .sks-ceiling-gear--g2 {
    --ceiling-slot: 2;
    --sks-gear-x:     50vw;
    --ceiling-gear-size:  clamp(140px, 17vw, 220px);
    --ceiling-gear-color: var(--sks-gold-g2);
  }
  .sks-ceiling-gear--g3 {
    --ceiling-slot: 3;
    --sks-gear-x:     clamp(18%, 28.8vw, 42%);
    --ceiling-gear-size:  clamp(115px, 14vw, 180px);
    --ceiling-gear-color: var(--sks-gold-g3);
  }

  /* ─── STEP 1.7 Minimap (desktop right-bottom vertical) ── */
  .sks-minimap {
    left: auto;
    right: clamp(16px, 2vw, 28px);
    bottom: clamp(16px, 2vh, 28px);
    transform: none;
    flex-direction: column;
    gap: clamp(6px, 0.9vh, 12px);
    padding: clamp(10px, 1.2vh, 16px) clamp(10px, 1vw, 14px);
    border-radius: 3px;
  }
  .sks-minimap__item {
    gap: clamp(8px, 1vw, 14px);
    padding: 4px 6px 4px 10px;
    min-width: 96px;
    min-height: auto;
    justify-content: flex-start;
  }
  .sks-minimap__gear-slot {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    flex-shrink: 0;
  }
  .sks-minimap__gear {
    position: static;
    top: auto;
    left: auto;
    transform: none;
    width: var(--mini-size, 28px);
    height: var(--mini-size, 28px);
    aspect-ratio: 1;
    overflow: visible;
    pointer-events: none;
    color: var(--sks-mini-color, var(--sks-gold-g0));
  }
  .sks-minimap__item[data-target="#hero"] { --mini-size: 36px; }
  .sks-minimap__item[data-target="#why"]  { --mini-size: 32px; }
  .sks-minimap__item[data-target="#what"] { --mini-size: 28px; }
  .sks-minimap__item[data-target="#how"]  { --mini-size: 24px; }
  .sks-minimap__item[data-target="#who"]  { --mini-size: 20px; }

  .sks-minimap__label {
    display: inline-flex;
    align-items: baseline;
    gap: 8px;
    font-family: "Inter", system-ui, sans-serif;
    font-weight: 400;
    white-space: nowrap;
  }
  .sks-minimap__num {
    font-size: 10px;
    letter-spacing: 0.2em;
    opacity: 0.75;
  }
  .sks-minimap__name {
    font-size: 9px;
    letter-spacing: 0.22em;
    opacity: 0.55;
    text-transform: uppercase;
  }

  /* 2.3.4 通過済み金線(desktop 限定) */
  .sks-minimap__item.is-stacked::before {
    content: '';
    display: block;
    position: absolute;
    right: 0;
    left: auto;
    top: 15%;
    bottom: 15%;
    width: 2px;
    background: oklch(88% 0.10 88 / 0.5);
    transition: background 320ms ease-out;
  }

  /* desktop は ::after で現在地ドット(円形、金色) */
  .sks-minimap__item::after {
    content: '';
    display: inline-block;
    width: 4px;
    height: 4px;
    border-radius: 50%;
    margin-left: auto;
    background: transparent;
    transition: background 320ms ease-out, box-shadow 320ms ease-out;
  }
  .sks-minimap__item.is-current::after {
    background: var(--sks-gold-g0);
    box-shadow: 0 0 8px oklch(88% 0.10 88 / 0.7);
  }

} /* end @media (min-width: 1024px) */

/* =====================================================================
   3D Gear Canvas (gear3d.js)
   ===================================================================== */
.sks-gear3d-canvas {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 10;  /* .sks-main (z:2) より上、loader (z:9999) より下 */
  pointer-events: none;
  display: none; /* JS が sks-gear3d-active を付与したら表示 */
}

.sks-gear3d-active .sks-gear3d-canvas {
  display: block;
}

/* 3D 有効時: メイン SVG 歯車のパスを非表示(位置計算用に要素は残す) */
.sks-gear3d-active .sks-gear__path,
.sks-gear3d-active .sks-gear__inner,
.sks-gear3d-active .sks-gear__shaft {
  visibility: hidden;
}

/* ミニマップ・天井・strip の SVG は 3D 化しないため表示を維持 */
.sks-gear3d-active .sks-minimap__gear .sks-gear__path,
.sks-gear3d-active .sks-minimap__gear .sks-gear__inner,
.sks-gear3d-active .sks-minimap__gear .sks-gear__shaft,
.sks-gear3d-active .sks-ceiling-gear .sks-gear__path,
.sks-gear3d-active .sks-ceiling-gear .sks-gear__inner,
.sks-gear3d-active .sks-ceiling-gear .sks-gear__shaft,
.sks-gear3d-active .sks-strip__gear .sks-gear__path,
.sks-gear3d-active .sks-strip__gear .sks-gear__inner,
.sks-gear3d-active .sks-strip__gear .sks-gear__shaft,
.sks-gear3d-active .sks-product__gear .sks-gear__path,
.sks-gear3d-active .sks-product__gear .sks-gear__inner,
.sks-gear3d-active .sks-product__gear .sks-gear__shaft {
  visibility: visible;
}

/* reduced-motion: 3D を無効化（SVG fallback に戻す） */
@media (prefers-reduced-motion: reduce) {
  .sks-gear3d-canvas { display: none !important; }
  .sks-gear3d-active .sks-gear__path,
  .sks-gear3d-active .sks-gear__inner,
  .sks-gear3d-active .sks-gear__shaft {
    visibility: visible !important;
  }
}