/* =========================================================================
   しじま — 中途覚醒とつき合う夜の物販ガイド
   Design: ミッドナイト・インディゴ × 深い菫色。墨のにじみ／霧、遠い星の粒だけの光、
           呼吸のように遅いフェード。上（覚醒）から下（眠りの底）へ沈んでいく縦の世界。
   Fonts:  Kaisei HarunoUmi（筆致の明朝＝声）/ Zen Kaku Gothic New（本文）/ Fragment Mono（数値・見出し小）
   ========================================================================= */

:root {
  /* --- 夜の底のインディゴ --- */
  --ink:        #0B0E17;   /* 最深部・地の色 */
  --ink-2:      #0E1220;   /* わずかに持ち上がった面 */
  --panel:      #131829;   /* カード・額装の面 */
  --panel-2:    #171D33;   /* 額装の内側 */
  --sumi:       #232A47;   /* 墨のにじみ＝境界線の中間色 */
  --sumi-soft:  rgba(123,111,180,0.14); /* にじんだ罫（violet寄り） */

  /* --- 文字 --- */
  --mist:       #A7A9C8;   /* 本文＝霧のラベンダーグレー */
  --mist-dim:   #7C7EA0;   /* 補助文字 */
  --haku:       #DBD9EC;   /* 見出し＝ほの白 */

  /* --- 菫（アクセント）--- */
  --sumire:     #9B8AD4;   /* リンク・アクセント（可読な菫）*/
  --sumire-hi:  #B7A9E6;   /* hover の明るい菫 */
  --sumire-deep:#5B4E8C;   /* 塗り・グロウの深い菫 */

  /* --- ともしび（唯一の暖色＝沈んだ先の温もり。極小限に）--- */
  --tomoshibi:  #C79A63;
  --tomoshibi-glow: rgba(199,154,99,0.55);

  --maxw: 1160px;
  --gutter: clamp(20px, 5vw, 48px);

  --font-display: 'Kaisei HarunoUmi', 'Shippori Mincho', serif;
  --font-body: 'Zen Kaku Gothic New', system-ui, sans-serif;
  --font-mono: 'Fragment Mono', ui-monospace, monospace;

  --ease-slow: cubic-bezier(0.22, 0.61, 0.30, 1);
}

/* ---------------- reset ---------------- */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; padding: 0; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--font-body);
  font-weight: 400;
  color: var(--mist);
  background-color: var(--ink);
  line-height: 1.9;
  letter-spacing: 0.02em;
  font-feature-settings: "palt" 1;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
  position: relative;
}

/* 地の底: 上=冷たい覚醒の藍 → 下=沈んだ温もりへ、極めてなだらかに */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(1200px 700px at 78% -8%, rgba(91,78,140,0.20), transparent 60%),
    radial-gradient(900px 900px at 12% 108%, rgba(199,154,99,0.055), transparent 62%),
    linear-gradient(180deg, #090C15 0%, #0B0E17 42%, #0C0F1C 100%);
}

/* 遠い星の粒（ごく僅か・ゆっくり明滅） */
body::after {
  content: '';
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image:
    radial-gradient(1.4px 1.4px at 18% 22%, rgba(219,217,236,0.55), transparent 60%),
    radial-gradient(1px 1px at 68% 14%, rgba(219,217,236,0.4), transparent 60%),
    radial-gradient(1.2px 1.2px at 84% 34%, rgba(199,154,99,0.5), transparent 60%),
    radial-gradient(1px 1px at 42% 8%, rgba(219,217,236,0.35), transparent 60%),
    radial-gradient(1px 1px at 30% 40%, rgba(155,138,212,0.4), transparent 60%);
  opacity: 0.9;
  animation: starDrift 14s ease-in-out infinite alternate;
}

img { max-width: 100%; display: block; }
a { color: var(--sumire); text-decoration: none; transition: color 0.4s var(--ease-slow); }
a:hover { color: var(--sumire-hi); }

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

/* ---------------- layout utilities ---------------- */
.wrap { width: 100%; max-width: var(--maxw); margin-inline: auto; padding-inline: var(--gutter); }
.wrap.narrow { max-width: 760px; }

.eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.34em;
  text-transform: uppercase;
  color: var(--sumire);
  display: inline-flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
}
.eyebrow::before {
  content: '';
  width: 26px; height: 1px;
  background: linear-gradient(90deg, transparent, var(--sumire-deep));
}

.section { padding-block: clamp(72px, 12vw, 128px); position: relative; }

.section-title {
  font-family: var(--font-display);
  font-weight: 500;
  color: var(--haku);
  font-size: clamp(26px, 4.4vw, 40px);
  line-height: 1.44;
  letter-spacing: 0.02em;
}

/* reveal（ゆっくり浮かびあがる） */
[data-reveal] {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 1.1s var(--ease-slow), transform 1.1s var(--ease-slow);
  will-change: opacity, transform;
}
[data-reveal].is-revealed { opacity: 1; transform: none; }

/* ---------------- skip link ---------------- */
.skip-link {
  position: absolute; left: -9999px; top: 0;
  background: var(--panel); color: var(--haku);
  padding: 12px 18px; z-index: 200; border-radius: 0 0 8px 0;
}
.skip-link:focus { left: 0; }

/* ---------------- compliance (PR) bar ---------------- */
.pr-bar {
  position: relative; z-index: 60;
  background: rgba(11,14,23,0.86);
  border-bottom: 1px solid var(--sumi-soft);
  color: var(--mist-dim);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  text-align: center;
  padding: 8px 16px;
  backdrop-filter: blur(6px);
}
.pr-bar strong {
  font-family: var(--font-mono);
  color: var(--sumire);
  letter-spacing: 0.18em;
  margin-right: 10px;
  font-weight: 400;
}

/* ---------------- header ---------------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(9,12,21,0.68);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--sumi-soft);
}
.site-header .wrap {
  display: flex; align-items: center; justify-content: space-between;
  min-height: 66px; gap: 16px;
}
.logo { display: inline-flex; align-items: center; gap: 13px; color: var(--haku); }
.logo:hover { color: var(--haku); }
.logo-mark {
  font-family: var(--font-display);
  font-size: 25px;
  line-height: 1;
  color: var(--sumire-hi);
  text-shadow: 0 0 16px rgba(155,138,212,0.45);
}
.logo-text {
  font-family: var(--font-display);
  font-size: 20px;
  letter-spacing: 0.16em;
  display: block;
}
.logo-tagline {
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.24em;
  color: var(--mist-dim);
  text-transform: uppercase;
  display: block;
  margin-top: 2px;
}

.nav { display: flex; align-items: center; gap: 26px; }
.nav a {
  color: var(--mist);
  font-size: 13.5px;
  letter-spacing: 0.08em;
  position: relative;
  padding-block: 4px;
}
.nav a::after {
  content: ''; position: absolute; left: 0; bottom: 0;
  width: 0; height: 1px; background: var(--sumire);
  transition: width 0.4s var(--ease-slow);
}
.nav a:hover { color: var(--haku); }
.nav a:hover::after { width: 100%; }

.nav-toggle {
  display: none;
  width: 42px; height: 42px;
  background: none; border: 1px solid var(--sumi);
  border-radius: 8px; cursor: pointer;
  position: relative;
}
.nav-toggle-bars, .nav-toggle-bars::before, .nav-toggle-bars::after {
  content: ''; position: absolute; left: 50%; top: 50%;
  width: 18px; height: 1.4px; background: var(--haku);
  transform: translate(-50%, -50%);
  transition: transform 0.3s var(--ease-slow), opacity 0.3s var(--ease-slow);
}
.nav-toggle-bars::before { transform: translate(-50%, -7px); }
.nav-toggle-bars::after { transform: translate(-50%, 5px); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars { background: transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before { transform: translate(-50%, -50%) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after { transform: translate(-50%, -50%) rotate(-45deg); }

/* =========================================================================
   HERO — 沈降のたてご（signature）
   ========================================================================= */
.hero { position: relative; padding-block: clamp(56px, 9vw, 104px); overflow: hidden; }
.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: clamp(28px, 6vw, 72px);
  align-items: center;
}

.hero-eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--sumire);
  margin-bottom: 26px;
  display: flex; align-items: center; gap: 12px;
}
.hero-eyebrow .tick { color: var(--tomoshibi); }

.hero-title {
  font-family: var(--font-display);
  font-weight: 500;
  color: var(--haku);
  font-size: clamp(30px, 5.6vw, 58px);
  line-height: 1.3;
  letter-spacing: 0.03em;
  margin-bottom: 30px;
}
.hero-title .quiet { color: var(--mist); }
.hero-title .glow {
  color: var(--sumire-hi);
  text-shadow: 0 0 30px rgba(155,138,212,0.35);
}

.hero-copy { max-width: 34em; }
.hero-copy p { color: var(--mist); font-size: clamp(15px, 1.6vw, 16.5px); margin-bottom: 18px; }
.hero-copy p.lead-em {
  color: var(--haku);
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(16px, 1.9vw, 19px);
  line-height: 1.95;
  letter-spacing: 0.03em;
}
.hero-copy .signoff {
  color: var(--tomoshibi);
  font-family: var(--font-display);
  font-size: clamp(15px, 1.8vw, 18px);
  letter-spacing: 0.06em;
  margin-top: 24px;
}

.hero-actions { display: flex; flex-wrap: wrap; gap: 16px; margin-top: 34px; }
.btn {
  display: inline-flex; align-items: center; gap: 9px;
  font-family: var(--font-body);
  font-size: 14px; letter-spacing: 0.08em;
  padding: 14px 26px; border-radius: 40px;
  transition: all 0.5s var(--ease-slow);
  border: 1px solid transparent;
}
.btn-primary {
  background: linear-gradient(180deg, rgba(91,78,140,0.55), rgba(91,78,140,0.30));
  color: var(--haku);
  border-color: rgba(155,138,212,0.4);
  box-shadow: 0 0 0 rgba(155,138,212,0);
}
.btn-primary:hover {
  color: var(--haku);
  border-color: var(--sumire);
  box-shadow: 0 8px 40px rgba(91,78,140,0.4);
  transform: translateY(-2px);
}
.btn-ghost { color: var(--mist); border-color: var(--sumi); }
.btn-ghost:hover { color: var(--haku); border-color: var(--sumire-deep); }

/* --- signature: 縦の深さ計。ともしびが上（覚醒3:07）から底へ沈む --- */
.sinker {
  position: relative;
  height: clamp(360px, 52vw, 480px);
  display: flex; justify-content: center;
}
.sinker-col {
  position: relative;
  width: clamp(150px, 20vw, 188px);
  height: 100%;
  border-radius: 100px;
  background:
    linear-gradient(180deg,
      rgba(120,133,180,0.14) 0%,
      rgba(35,42,71,0.5) 34%,
      rgba(19,24,41,0.85) 68%,
      rgba(24,18,30,0.92) 100%);
  border: 1px solid var(--sumi-soft);
  box-shadow: inset 0 0 60px rgba(0,0,0,0.5), 0 0 80px rgba(91,78,140,0.14);
  overflow: hidden;
  filter: blur(0.2px);
}
/* 表面のさざなみ（冷たい覚醒） */
.sinker-surface {
  position: absolute; top: 10%; left: 8%; right: 8%;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(155,138,212,0.55), transparent);
  box-shadow: 0 0 16px rgba(155,138,212,0.4);
}
.sinker-time {
  position: absolute; top: calc(10% - 30px); left: 50%; transform: translateX(-50%);
  font-family: var(--font-mono);
  font-size: 12px; letter-spacing: 0.28em;
  color: var(--sumire);
  white-space: nowrap;
}
/* 三つの層の目印（体温・寝返り・体圧） */
.sinker-mark {
  position: absolute; left: 0; right: 0;
  display: flex; align-items: center; gap: 10px;
  padding-inline: 16px;
  font-family: var(--font-mono);
  font-size: 9.5px; letter-spacing: 0.18em;
  color: var(--mist-dim);
}
.sinker-mark::before {
  content: ''; flex: 1; height: 1px;
  background: repeating-linear-gradient(90deg, rgba(123,111,180,0.24) 0 5px, transparent 5px 11px);
}
.sinker-mark.m1 { top: 34%; }
.sinker-mark.m2 { top: 54%; }
.sinker-mark.m3 { top: 74%; }
/* 底 */
.sinker-floor {
  position: absolute; bottom: 7%; left: 12%; right: 12%;
  text-align: center;
  font-family: var(--font-display);
  font-size: 12.5px; letter-spacing: 0.3em;
  color: var(--tomoshibi);
}
.sinker-floor::after {
  content: ''; display: block; margin: 8px auto 0;
  width: 60%; height: 1px;
  background: linear-gradient(90deg, transparent, var(--tomoshibi-glow), transparent);
}
/* 沈んでいくともしび */
.sinker-mote {
  position: absolute; left: 50%; top: 10%;
  width: 16px; height: 16px; margin-left: -8px; margin-top: -8px;
  border-radius: 50%;
  background: radial-gradient(circle, #F0D9BD 0%, var(--tomoshibi) 42%, rgba(199,154,99,0) 72%);
  box-shadow: 0 0 26px 6px var(--tomoshibi-glow);
  animation: sink 15s var(--ease-slow) infinite;
}
.sinker-halo {
  position: absolute; left: 50%; transform: translateX(-50%);
  bottom: 7%;
  width: 120px; height: 60px;
  background: radial-gradient(ellipse at center, rgba(199,154,99,0.22), transparent 70%);
  filter: blur(6px);
}

/* =========================================================================
   3時の底 — concept（なぜ夜中に目が覚めるのか）
   ========================================================================= */
.floor-concept { background: linear-gradient(180deg, transparent, rgba(14,18,32,0.6) 30%, transparent); }
.floor-lede {
  font-family: var(--font-display);
  font-weight: 400;
  color: var(--haku);
  font-size: clamp(18px, 2.4vw, 24px);
  line-height: 1.95;
  letter-spacing: 0.03em;
  max-width: 24em;
  margin-block: 22px 40px;
}
.floor-lede .em { color: var(--sumire-hi); }

.reasons {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--sumi-soft);
  border: 1px solid var(--sumi-soft);
  border-radius: 14px;
  overflow: hidden;
}
.reason {
  background: linear-gradient(180deg, var(--panel), var(--ink-2));
  padding: clamp(24px, 3vw, 34px);
  position: relative;
}
.reason-depth {
  font-family: var(--font-mono);
  font-size: 11px; letter-spacing: 0.2em;
  color: var(--sumire);
  display: flex; align-items: baseline; gap: 8px;
  margin-bottom: 16px;
}
.reason-depth .lab { color: var(--mist-dim); letter-spacing: 0.14em; }
.reason h3 {
  font-family: var(--font-display);
  font-weight: 500;
  color: var(--haku);
  font-size: 19px;
  letter-spacing: 0.04em;
  margin-bottom: 12px;
}
.reason p { font-size: 14px; color: var(--mist); line-height: 1.85; }
.floor-close {
  margin-top: 38px;
  font-size: 15px;
  color: var(--mist);
  max-width: 40em;
}
.floor-close strong { color: var(--haku); font-weight: 500; }

/* =========================================================================
   SHOWCASE — 沈降の層（strata）＋ 商品
   ========================================================================= */
.showcase { position: relative; padding-block: clamp(56px, 9vw, 96px); }
.showcase-inner { display: grid; grid-template-columns: 172px 1fr; gap: clamp(24px, 4vw, 56px); align-items: start; }

/* 沈降ものさし（depth rail） */
.depth-rail {
  position: sticky; top: 92px;
  display: flex; flex-direction: column; gap: 4px;
  padding-left: 4px;
}
.depth-rail::before {
  content: ''; position: absolute; left: 9px; top: 12px; bottom: 12px;
  width: 1px;
  background: linear-gradient(180deg, var(--sumi-soft), rgba(199,154,99,0.2));
}
.depth-link {
  position: relative;
  display: grid; grid-template-columns: 20px 1fr; align-items: center;
  gap: 12px; padding: 12px 6px;
  color: var(--mist-dim);
}
.depth-dot {
  width: 9px; height: 9px; border-radius: 50%;
  background: var(--ink-2); border: 1px solid var(--sumi);
  justify-self: start; margin-left: 1px;
  transition: all 0.5s var(--ease-slow);
}
.depth-mark {
  display: none;
}
.depth-name {
  font-size: 12.5px; letter-spacing: 0.08em;
  color: var(--mist-dim);
  transition: color 0.4s var(--ease-slow);
}
.depth-link.is-passed .depth-dot { background: var(--sumire-deep); border-color: var(--sumire-deep); }
.depth-link.is-active .depth-dot {
  background: var(--tomoshibi); border-color: var(--tomoshibi);
  box-shadow: 0 0 14px 2px var(--tomoshibi-glow);
}
.depth-link.is-active .depth-name { color: var(--haku); }
.depth-link:hover .depth-name { color: var(--mist); }

/* 層 */
.strata { display: flex; flex-direction: column; gap: clamp(56px, 9vw, 104px); }
.stratum { scroll-margin-top: 92px; }
.stratum-head { display: flex; align-items: flex-start; gap: 20px; margin-bottom: 24px; }
.stratum-depth {
  flex-shrink: 0;
  width: 62px;
  border: 1px solid var(--sumi-soft);
  border-radius: 10px;
  padding: 10px 6px;
  text-align: center;
  background: rgba(19,24,41,0.5);
}
.stratum-depth-num {
  font-family: var(--font-mono);
  font-size: 22px;
  color: var(--sumire-hi);
  display: block;
  line-height: 1;
}
.stratum-depth-lab {
  font-size: 10px; letter-spacing: 0.1em;
  color: var(--mist-dim);
  display: block; margin-top: 8px;
}
.stratum-label {
  font-family: var(--font-mono);
  font-size: 11px; letter-spacing: 0.24em; text-transform: uppercase;
  color: var(--sumire);
  margin-bottom: 12px;
}
.stratum-title {
  font-family: var(--font-display);
  font-weight: 500;
  color: var(--haku);
  font-size: clamp(23px, 3.4vw, 33px);
  line-height: 1.4;
  letter-spacing: 0.03em;
}
.stratum-motif {
  font-family: var(--font-display);
  color: var(--sumire);
  font-size: 15px; letter-spacing: 0.08em;
  margin-top: 8px;
}
.stratum-lead {
  font-family: var(--font-display);
  font-weight: 400;
  color: var(--haku);
  font-size: clamp(15.5px, 1.8vw, 18px);
  line-height: 1.95;
  letter-spacing: 0.03em;
  max-width: 40em;
  margin-bottom: 16px;
}
.stratum-desc { font-size: 14.5px; color: var(--mist); max-width: 42em; margin-bottom: 34px; }

/* 商品グリッド */
.product-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(248px, 1fr));
  gap: clamp(18px, 2.4vw, 28px);
}

/* --- 商品カード --- */
.product {
  background: linear-gradient(180deg, var(--panel), var(--ink-2));
  border: 1px solid var(--sumi-soft);
  border-radius: 16px;
  overflow: hidden;
  display: flex; flex-direction: column;
  transition: border-color 0.6s var(--ease-slow), transform 0.6s var(--ease-slow), box-shadow 0.6s var(--ease-slow);
}
.product:hover {
  border-color: rgba(155,138,212,0.34);
  transform: translateY(-4px);
  box-shadow: 0 20px 60px rgba(6,8,14,0.6);
}

/* 額装（feathered scan bed）: 暗がりに写真を沈める */
.product-figure {
  position: relative;
  padding: clamp(20px, 3vw, 30px);
  background:
    radial-gradient(120% 90% at 50% 22%, rgba(91,78,140,0.16), transparent 62%),
    var(--panel-2);
}
.product-frame {
  position: relative;
  aspect-ratio: 4 / 3;
  display: flex; align-items: center; justify-content: center;
}
/* 商品が「置かれている」ような、下のともしびの映り込み */
.product-frame::after {
  content: '';
  position: absolute; left: 14%; right: 14%; bottom: -4px;
  height: 26px;
  background: radial-gradient(ellipse at center, rgba(91,78,140,0.28), transparent 72%);
  filter: blur(7px);
}
.product-image {
  max-width: 100%;
  max-height: 100%;
  width: auto; height: auto;
  object-fit: contain;
  /* 縁を夜へにじませる羽根マスク（白背景の商品写真を暗がりへ溶かす） */
  -webkit-mask-image: radial-gradient(120% 118% at 50% 46%, #000 56%, rgba(0,0,0,0.5) 78%, transparent 100%);
  mask-image: radial-gradient(120% 118% at 50% 46%, #000 56%, rgba(0,0,0,0.5) 78%, transparent 100%);
  filter: saturate(0.92) brightness(0.97);
  transition: filter 0.6s var(--ease-slow), transform 0.6s var(--ease-slow);
}
.product:hover .product-image { filter: saturate(1) brightness(1.02); transform: scale(1.02); }

.product-body { padding: clamp(18px, 2.4vw, 24px); display: flex; flex-direction: column; flex: 1; }
.product-flag {
  align-self: flex-start;
  font-family: var(--font-mono);
  font-size: 10px; letter-spacing: 0.2em; text-transform: uppercase;
  color: var(--tomoshibi);
  border: 1px solid rgba(199,154,99,0.4);
  border-radius: 30px; padding: 4px 12px;
  margin-bottom: 14px;
}
.product-name {
  font-family: var(--font-body);
  font-weight: 500;
  color: var(--haku);
  font-size: 14.5px;
  line-height: 1.6;
  letter-spacing: 0.02em;
  margin-bottom: 12px;
}
.product-reason { font-size: 13px; color: var(--mist); line-height: 1.82; margin-bottom: 18px; flex: 1; }

/* --- offers（Amazon ＋ 楽天 並列）--- */
.offers { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-top: auto; }
.offer {
  position: relative;
  display: flex; flex-direction: column; align-items: center; gap: 2px;
  padding: 12px 8px 26px;
  border-radius: 11px;
  border: 1px solid var(--sumi);
  background: rgba(11,14,23,0.4);
  transition: all 0.5s var(--ease-slow);
  text-align: center;
}
.offer-store { font-size: 13.5px; font-weight: 500; letter-spacing: 0.04em; }
.offer-go { font-size: 11px; color: var(--mist-dim); letter-spacing: 0.04em; }
.offer-arrow { margin-left: 4px; transition: transform 0.4s var(--ease-slow); display: inline-block; }
.offer--amazon .offer-store { color: var(--haku); }
.offer--rakuten .offer-store { color: var(--haku); }
.offer--amazon:hover { border-color: var(--sumire); background: rgba(91,78,140,0.16); transform: translateY(-2px); }
.offer--rakuten:hover { border-color: var(--tomoshibi); background: rgba(199,154,99,0.10); transform: translateY(-2px); }
.offer:hover .offer-arrow { transform: translateX(3px); }
.offer:hover .offer-go { color: var(--mist); }
.pr-tag {
  position: absolute; bottom: 6px; left: 50%; transform: translateX(-50%);
  font-family: var(--font-mono);
  font-size: 8.5px; letter-spacing: 0.18em;
  color: var(--mist-dim);
  border: 1px solid var(--sumi-soft);
  border-radius: 20px; padding: 1px 8px;
  line-height: 1.6;
}
.offer-note {
  font-size: 10.5px; color: var(--mist-dim); line-height: 1.7;
  margin-top: 12px; letter-spacing: 0.02em;
}

/* --- flagship の層は主役として一段大きく --- */
.stratum--flagship .stratum-depth { border-color: rgba(199,154,99,0.4); }
.stratum--flagship .stratum-depth-num { color: var(--tomoshibi); }
.product-list--flagship { grid-template-columns: repeat(auto-fill, minmax(268px, 1fr)); }
.product-list--flagship .product--flagship {
  grid-column: 1 / -1;
  border-color: rgba(199,154,99,0.28);
}
@media (min-width: 720px) {
  .product-list--flagship .product--flagship {
    flex-direction: row;
  }
  .product-list--flagship .product--flagship .product-figure { flex: 0 0 46%; }
  .product-list--flagship .product--flagship .product-frame { aspect-ratio: 1 / 1; }
  .product-list--flagship .product--flagship .product-body { justify-content: center; }
  .product-list--flagship .product--flagship .product-reason { font-size: 14px; }
}

/* =========================================================================
   about-link / disclosure
   ========================================================================= */
.approach { position: relative; }
.approach .wrap { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(28px, 5vw, 64px); align-items: center; }
.approach-body p { color: var(--mist); margin-bottom: 16px; }
.approach-body p strong { color: var(--haku); font-weight: 500; }
.approach-figure {
  border: 1px solid var(--sumi-soft);
  border-radius: 16px;
  padding: clamp(28px, 4vw, 44px);
  background: linear-gradient(180deg, var(--panel), var(--ink-2));
  text-align: center;
}
.approach-figure .mark {
  font-family: var(--font-display);
  font-size: clamp(48px, 8vw, 72px);
  color: var(--sumire-hi);
  text-shadow: 0 0 40px rgba(155,138,212,0.34);
  line-height: 1;
}
.approach-figure p {
  margin-top: 20px; font-size: 13.5px; color: var(--mist-dim);
  font-family: var(--font-mono); letter-spacing: 0.16em;
}

.section-disclosure { background: linear-gradient(180deg, transparent, rgba(14,18,32,0.55)); }
.disclosure-block p { font-size: 13.5px; color: var(--mist); margin-bottom: 16px; line-height: 1.9; }
.disclosure-block p strong { color: var(--haku); font-weight: 500; }
.amazon-required {
  margin-top: 24px !important;
  padding: 16px 20px;
  border-left: 2px solid var(--sumire-deep);
  background: rgba(91,78,140,0.08);
  border-radius: 0 8px 8px 0;
  color: var(--haku) !important;
  font-size: 13px !important;
}

/* =========================================================================
   footer
   ========================================================================= */
.site-footer {
  border-top: 1px solid var(--sumi-soft);
  padding-block: clamp(48px, 7vw, 76px);
  background: rgba(9,12,21,0.6);
}
.footer-brand {
  font-family: var(--font-display);
  font-size: 22px; letter-spacing: 0.18em; color: var(--haku);
}
.footer-tagline { font-size: 13px; color: var(--sumire); margin-top: 6px; margin-bottom: 24px; letter-spacing: 0.06em; }
.footer-meta { font-size: 12px; color: var(--mist-dim); line-height: 1.95; max-width: 52em; }
.footer-meta strong { color: var(--mist); font-weight: 500; }
.footer-nav { display: flex; flex-wrap: wrap; gap: 20px; margin-block: 26px 20px; }
.footer-nav a { font-size: 13px; color: var(--mist); letter-spacing: 0.06em; }
.footer-nav a:hover { color: var(--haku); }
.footer-updated, .footer-copy { font-family: var(--font-mono); font-size: 10.5px; letter-spacing: 0.14em; color: var(--mist-dim); }
.footer-updated { margin-bottom: 6px; }

/* =========================================================================
   motion
   ========================================================================= */
@keyframes sink {
  0%   { top: 10%; opacity: 0; }
  10%  { opacity: 1; }
  84%  { opacity: 1; }
  100% { top: 90%; opacity: 0.15; }
}
@keyframes starDrift {
  0%   { opacity: 0.55; transform: translateY(0); }
  100% { opacity: 0.95; transform: translateY(-8px); }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .sinker-mote { animation: none; top: 84%; opacity: 1; }
  body::after { animation: none; }
  [data-reveal] { transition: none; opacity: 1; transform: none; }
  * { transition-duration: 0.01ms !important; }
}

/* =========================================================================
   responsive
   ========================================================================= */
@media (max-width: 960px) {
  .showcase-inner { grid-template-columns: 1fr; }
  .depth-rail {
    position: static;
    flex-direction: row; flex-wrap: wrap; gap: 8px 14px;
    padding: 14px 0; margin-bottom: 8px;
    border-block: 1px solid var(--sumi-soft);
  }
  .depth-rail::before { display: none; }
  .depth-link { padding: 6px 4px; }
  .hero-grid { grid-template-columns: 1fr; }
  .sinker { height: clamp(300px, 74vw, 380px); order: -1; margin-bottom: 20px; }
  .approach .wrap { grid-template-columns: 1fr; }
}

@media (max-width: 720px) {
  .nav-toggle { display: inline-flex; }
  .nav {
    position: absolute; top: 100%; right: var(--gutter); left: var(--gutter);
    flex-direction: column; align-items: flex-start; gap: 4px;
    background: rgba(14,18,32,0.97);
    backdrop-filter: blur(16px);
    border: 1px solid var(--sumi);
    border-radius: 14px;
    padding: 10px 18px;
    max-height: 0; overflow: hidden; opacity: 0;
    transition: max-height 0.5s var(--ease-slow), opacity 0.4s var(--ease-slow), padding 0.4s var(--ease-slow);
  }
  .nav[data-open="true"] { max-height: 340px; opacity: 1; padding: 16px 18px; }
  .nav a { width: 100%; padding-block: 10px; border-bottom: 1px solid var(--sumi-soft); }
  .nav a:last-child { border-bottom: 0; }
  .reasons { grid-template-columns: 1fr; }
  .offers { grid-template-columns: 1fr 1fr; }
  .logo-tagline { display: none; }
}

@media (max-width: 380px) {
  .offers { grid-template-columns: 1fr; }
}