/* =========================================================================
   かなめ — style.css
   世界観: エンジニアリング図面／製図。グラファイト地 × ラストの線画。
   方眼・寸法線・注記の「図面言語」で、腰と座面を系として設計する。
   姉妹サイト(shijima=夜の菫 / LOADOUT=navy+黄HUD)とは別物の工学トーン。
   ========================================================================= */

:root {
  --graphite:   #1B1E23;   /* base ground */
  --graphite-2: #202429;   /* section panel */
  --graphite-3: #262B32;   /* card */
  --graphite-4: #2B313A;   /* raised element */
  --ink:        #E7E3D9;   /* warm off-white text */
  --ink-dim:    #B4AFA3;
  --ink-faint:  #857F73;
  --line:       #333A43;   /* grid / hairline */
  --line-2:     #4B535E;   /* dimension / steel line */
  --steel:      #6C7681;   /* chair line, secondary */
  --rust:       #C65A2E;   /* primary accent */
  --rust-bright:#E0793B;   /* highlight */
  --rust-soft:  rgba(198, 90, 46, 0.13);
  --rakuten:    #B24A3A;

  --font-sans: 'IBM Plex Sans JP', system-ui, -apple-system, 'Hiragino Kaku Gothic ProN', 'Noto Sans JP', sans-serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, 'SFMono-Regular', Menlo, monospace;

  --maxw: 1180px;
  --gutter: clamp(18px, 4vw, 44px);
  --radius: 3px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

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

body {
  font-family: var(--font-sans);
  color: var(--ink);
  background-color: var(--graphite);
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 30px 30px;
  background-attachment: fixed;
  line-height: 1.85;
  font-size: 16px;
  letter-spacing: 0.01em;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
/* dim the fixed graph grid so text stays legible */
body::before {
  content: '';
  position: fixed; inset: 0; z-index: -1;
  background: radial-gradient(1200px 700px at 78% -8%, rgba(198,90,46,0.05), transparent 60%),
              linear-gradient(180deg, rgba(27,30,35,0.72) 0%, rgba(27,30,35,0.9) 40%, var(--graphite) 100%);
  pointer-events: none;
}

img { max-width: 100%; display: block; }
a { color: inherit; }

.wrap { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 var(--gutter); }
.wrap.narrow { max-width: 820px; }

.skip-link {
  position: absolute; left: -9999px; top: 0; z-index: 100;
  background: var(--rust); color: #fff; padding: 10px 18px;
  font-family: var(--font-mono); font-size: 13px;
}
.skip-link:focus { left: 12px; top: 12px; }

/* ---------- PR bar ---------- */
.pr-bar {
  background: var(--graphite-4);
  border-bottom: 1px solid var(--line);
  color: var(--ink-dim);
  font-size: 12px; letter-spacing: 0.04em;
  text-align: center; padding: 7px 14px;
  font-family: var(--font-mono);
}
.pr-bar strong {
  color: var(--rust-bright); font-weight: 600;
  border: 1px solid var(--rust); border-radius: 2px;
  padding: 1px 7px; margin-right: 10px; font-size: 11px;
}

/* ---------- header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 40;
  background: rgba(24, 27, 31, 0.86);
  backdrop-filter: blur(9px);
  border-bottom: 1px solid var(--line);
}
.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: 12px; text-decoration: none; }
.logo-mark { display: inline-flex; align-items: center; }
.logo-text {
  font-weight: 700; font-size: 21px; letter-spacing: 0.14em;
  color: var(--ink); display: block; line-height: 1;
}
.logo-tagline {
  font-family: var(--font-mono); font-size: 10.5px; letter-spacing: 0.22em;
  color: var(--rust-bright); display: block; margin-top: 4px;
}
.nav { display: flex; align-items: center; gap: 26px; }
.nav a {
  text-decoration: none; color: var(--ink-dim);
  font-size: 13.5px; letter-spacing: 0.06em; font-weight: 500;
  padding: 6px 0; position: relative; transition: color 0.2s;
}
.nav a::after {
  content: ''; position: absolute; left: 0; bottom: 0; width: 0; height: 1px;
  background: var(--rust); transition: width 0.24s ease;
}
.nav a:hover { color: var(--ink); }
.nav a:hover::after { width: 100%; }

.nav-toggle {
  display: none; width: 42px; height: 42px; border: 1px solid var(--line-2);
  background: transparent; border-radius: var(--radius); cursor: pointer; position: relative;
}
.nav-toggle-bars, .nav-toggle-bars::before, .nav-toggle-bars::after {
  position: absolute; left: 50%; width: 18px; height: 1.6px; background: var(--ink);
  transform: translateX(-50%); transition: 0.25s;
}
.nav-toggle-bars { top: 50%; transform: translate(-50%, -50%); }
.nav-toggle-bars::before { content: ''; top: -6px; }
.nav-toggle-bars::after { content: ''; top: 6px; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars { background: transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before { top: 0; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after { top: 0; transform: rotate(-45deg); }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 9px;
  font-family: var(--font-mono); font-size: 13.5px; letter-spacing: 0.08em;
  text-decoration: none; padding: 13px 24px; border-radius: var(--radius);
  transition: 0.2s; cursor: pointer; border: 1px solid transparent;
}
.btn-primary { background: var(--rust); color: #14100d; font-weight: 600; }
.btn-primary:hover { background: var(--rust-bright); transform: translateY(-1px); }
.btn-ghost { border-color: var(--line-2); color: var(--ink-dim); }
.btn-ghost:hover { border-color: var(--rust); color: var(--ink); }

/* ---------- eyebrow / section title ---------- */
.eyebrow {
  font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.22em;
  text-transform: uppercase; color: var(--rust-bright);
  display: inline-flex; align-items: center; gap: 12px; margin-bottom: 16px;
}
.eyebrow::before { content: ''; width: 30px; height: 1px; background: var(--rust); }
.section-title {
  font-weight: 700; font-size: clamp(26px, 4.4vw, 40px);
  line-height: 1.3; letter-spacing: 0.02em; color: var(--ink);
}
.section { padding: clamp(64px, 9vw, 112px) 0; position: relative; }

/* ---------- HERO ---------- */
.hero {
  padding: clamp(40px, 6vw, 76px) 0 clamp(56px, 8vw, 96px);
  border-bottom: 1px solid var(--line);
  position: relative;
}
.hero-grid {
  display: grid; grid-template-columns: 1.02fr 1fr;
  gap: clamp(28px, 5vw, 64px); align-items: center;
}
.hero-eyebrow {
  font-family: var(--font-mono); font-size: 12.5px; letter-spacing: 0.2em;
  color: var(--rust-bright); margin-bottom: 26px;
  display: inline-flex; align-items: center; gap: 10px;
}
.hero-eyebrow .tick { color: var(--rust); }
.hero-title {
  font-weight: 700; font-size: clamp(34px, 6.4vw, 62px);
  line-height: 1.16; letter-spacing: 0.01em; margin-bottom: 30px;
}
.hero-title .mute { color: var(--ink-dim); font-weight: 500; }
.hero-title .accent {
  color: var(--ink);
  background: linear-gradient(120deg, var(--rust-bright), var(--rust));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero-copy p { color: var(--ink-dim); margin-bottom: 15px; max-width: 40em; }
.hero-copy .lead-em {
  color: var(--ink); font-size: clamp(16px, 2vw, 18.5px);
  border-left: 2px solid var(--rust); padding-left: 18px; line-height: 1.9;
}
.hero-copy em { color: var(--rust-bright); font-style: normal; font-weight: 600; }
.hero-copy strong { color: var(--ink); font-weight: 600; }
.hero-copy .signoff {
  font-family: var(--font-mono); color: var(--rust-bright);
  letter-spacing: 0.14em; margin-top: 6px;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 30px; }

/* ---------- signature: SECTION SHEET ---------- */
.hero-figure { position: relative; }
.section-sheet {
  background:
    linear-gradient(rgba(51,58,67,0.5) 1px, transparent 1px),
    linear-gradient(90deg, rgba(51,58,67,0.5) 1px, transparent 1px),
    var(--graphite-2);
  background-size: 22px 22px, 22px 22px, auto;
  border: 1px solid var(--line-2);
  border-radius: var(--radius);
  padding: 14px 14px 8px;
  box-shadow: 0 24px 60px rgba(0,0,0,0.4);
  position: relative;
}
.section-sheet::before {
  /* corner registration ticks */
  content: ''; position: absolute; inset: 6px; pointer-events: none;
  background:
    linear-gradient(var(--rust), var(--rust)) left 0 top 0/14px 1.4px no-repeat,
    linear-gradient(var(--rust), var(--rust)) left 0 top 0/1.4px 14px no-repeat,
    linear-gradient(var(--rust), var(--rust)) right 0 top 0/14px 1.4px no-repeat,
    linear-gradient(var(--rust), var(--rust)) right 0 top 0/1.4px 14px no-repeat,
    linear-gradient(var(--rust), var(--rust)) left 0 bottom 0/14px 1.4px no-repeat,
    linear-gradient(var(--rust), var(--rust)) left 0 bottom 0/1.4px 14px no-repeat,
    linear-gradient(var(--rust), var(--rust)) right 0 bottom 0/14px 1.4px no-repeat,
    linear-gradient(var(--rust), var(--rust)) right 0 bottom 0/1.4px 14px no-repeat;
  opacity: 0.8;
}
.section-svg { width: 100%; height: auto; display: block; }
.section-svg .dim,
.section-svg text {
  font-family: 'IBM Plex Mono', 'IBM Plex Sans JP', monospace;
}
.section-svg .dim { fill: var(--rust-bright); font-size: 13px; letter-spacing: 0.06em; }
.section-svg .leader line { stroke: var(--line-2); stroke-width: 0.9; stroke-dasharray: 2 3; }
.section-svg .leader circle { fill: var(--rust-bright); stroke: none; }
.section-svg .leader text { fill: var(--ink-dim); font-size: 13px; letter-spacing: 0.03em; }
.section-svg .titleblock rect { fill: rgba(12,14,17,0.55); stroke: var(--line-2); stroke-width: 1; }
.section-svg .titleblock line { stroke: var(--line-2); stroke-width: 1; }
.section-svg .tb-key { fill: var(--ink-faint); font-size: 9px; letter-spacing: 0.2em; }
.section-svg .tb-val { fill: var(--ink); font-size: 14px; letter-spacing: 0.05em; }
.section-svg .tb-sub { fill: var(--ink-dim); font-size: 10px; letter-spacing: 0.03em; }
.section-cap {
  font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.05em;
  color: var(--ink-faint); display: flex; justify-content: space-between;
  padding: 8px 6px 2px; border-top: 1px dashed var(--line);
  margin-top: 6px;
}
.section-cap span { color: var(--rust-bright); }

/* ---------- concept ---------- */
.concept { border-bottom: 1px solid var(--line); }
.concept-lede {
  font-size: clamp(16px, 2.2vw, 19px); color: var(--ink-dim);
  margin: 22px 0 40px; max-width: 40em; line-height: 1.9;
}
.concept-lede .em { color: var(--rust-bright); font-weight: 600; }
.reasons { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.reason {
  background: var(--graphite-3); border: 1px solid var(--line);
  border-top: 2px solid var(--rust); border-radius: var(--radius);
  padding: 24px 22px;
}
.reason-code {
  font-family: var(--font-mono); display: flex; align-items: baseline; gap: 10px;
  margin-bottom: 14px;
}
.reason-code span:first-child { font-size: 26px; color: var(--rust-bright); font-weight: 600; }
.reason-code .lab {
  font-size: 11px; letter-spacing: 0.16em; color: var(--ink-faint);
  border: 1px solid var(--line-2); border-radius: 2px; padding: 2px 8px;
}
.reason h3 { font-size: 18px; margin-bottom: 10px; color: var(--ink); letter-spacing: 0.02em; }
.reason p { font-size: 14px; color: var(--ink-dim); line-height: 1.85; }

.ba {
  display: flex; align-items: center; justify-content: center; gap: 22px;
  margin: 48px 0 46px; flex-wrap: wrap;
}
.ba-panel {
  background: var(--graphite-2); border: 1px solid var(--line-2);
  border-radius: var(--radius); padding: 12px 12px 6px; width: min(300px, 42vw);
}
.ba-panel svg { width: 100%; height: auto; display: block; }
.ba-panel figcaption {
  font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.04em;
  color: var(--ink-dim); text-align: center; padding-top: 8px;
  border-top: 1px dashed var(--line); margin-top: 4px;
  display: flex; align-items: center; justify-content: center; gap: 8px; flex-wrap: wrap;
}
.ba-tag {
  font-size: 10px; letter-spacing: 0.14em; padding: 2px 7px; border-radius: 2px;
}
.ba-bad { background: rgba(120,80,70,0.3); color: #d99; border: 1px solid rgba(180,90,70,0.4); }
.ba-good { background: var(--rust-soft); color: var(--rust-bright); border: 1px solid var(--rust); }
.ba-arrow { font-size: 30px; color: var(--rust); font-family: var(--font-mono); }
.concept-close {
  font-size: clamp(15px, 1.9vw, 17px); color: var(--ink-dim);
  max-width: 46em; line-height: 1.95;
}
.concept-close strong { color: var(--ink); font-weight: 600; }

/* ---------- catalog / legend ---------- */
.catalog { border-bottom: 1px solid var(--line); }
.catalog--parts { background: var(--graphite-2); }
.catalog-intro { color: var(--ink-dim); max-width: 48em; margin: 18px 0 30px; }
.catalog-intro strong { color: var(--ink); font-weight: 600; }

.legend {
  background: var(--graphite-3); border: 1px solid var(--line-2);
  border-left: 3px solid var(--rust); border-radius: var(--radius);
  padding: 22px 24px; margin-bottom: 40px;
}
.legend-head {
  font-weight: 600; color: var(--ink); font-size: 15px; margin-bottom: 16px;
  display: flex; align-items: center; gap: 10px; letter-spacing: 0.02em;
}
.legend-mark {
  width: 20px; height: 20px; border: 1px solid var(--rust); border-radius: 50%;
  color: var(--rust-bright); font-family: var(--font-mono); font-size: 12px; font-style: italic;
  display: inline-flex; align-items: center; justify-content: center; flex: none;
}
.legend-list { list-style: none; display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px 28px; }
.legend-list li { font-size: 13.5px; color: var(--ink-dim); line-height: 1.7; }
.legend-list b {
  color: var(--rust-bright); font-family: var(--font-mono); font-weight: 600;
  font-size: 12.5px; letter-spacing: 0.04em; display: inline-block; margin-right: 8px;
  border-bottom: 1px solid var(--line-2);
}
.legend-note { font-size: 12px; color: var(--ink-faint); margin-top: 16px; line-height: 1.7; }
.ns-note { color: var(--ink-faint); font-size: 13px; margin: 12px 0; }

/* ---------- strata / category sections ---------- */
.strata-wrap { display: flex; flex-direction: column; gap: clamp(40px, 6vw, 68px); }
.stratum {
  opacity: 0; transform: translateY(20px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.stratum.is-revealed { opacity: 1; transform: none; }
.stratum-head {
  display: flex; align-items: stretch; gap: 18px; margin-bottom: 12px;
  border-bottom: 1px solid var(--line); padding-bottom: 14px;
}
.stratum-code {
  display: flex; flex-direction: column; justify-content: center;
  border: 1px solid var(--line-2); border-radius: var(--radius);
  padding: 8px 14px; min-width: 96px; background: var(--graphite-3);
}
.stratum-code-num {
  font-family: var(--font-mono); font-size: 20px; font-weight: 600;
  color: var(--rust-bright); letter-spacing: 0.06em;
}
.stratum-code-zone {
  font-family: var(--font-mono); font-size: 10.5px; letter-spacing: 0.08em;
  color: var(--ink-faint); margin-top: 3px;
}
.stratum-headtext { display: flex; flex-direction: column; justify-content: center; }
.stratum-label {
  font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.2em;
  color: var(--ink-faint); margin-bottom: 4px;
}
.stratum-title { font-size: clamp(20px, 2.8vw, 27px); font-weight: 700; color: var(--ink); letter-spacing: 0.02em; }
.stratum-motif { color: var(--rust-bright); font-weight: 500; font-size: 0.66em; letter-spacing: 0.04em; }
.stratum-lead { color: var(--ink-dim); margin: 6px 0 8px; max-width: 50em; }
.stratum-desc { color: var(--ink-faint); font-size: 13.5px; margin-bottom: 26px; max-width: 52em; line-height: 1.85; }

/* ---------- product list / card ---------- */
.product-list {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 350px));
  justify-content: start; gap: 22px;
}
.product {
  background: var(--graphite-3); border: 1px solid var(--line);
  border-radius: var(--radius); overflow: hidden;
  display: flex; flex-direction: column;
  transition: border-color 0.25s, transform 0.25s;
}
.product:hover { border-color: var(--line-2); transform: translateY(-2px); }
.product--flagship { border-color: var(--rust); box-shadow: 0 0 0 1px rgba(198,90,46,0.3); }

/* figure = 図面台紙の上の製品図版 */
.product-figure {
  height: 208px; background: #1C2025; position: relative;
  border-bottom: 1px solid var(--line); overflow: hidden;
  background-image:
    linear-gradient(rgba(51,58,67,0.35) 1px, transparent 1px),
    linear-gradient(90deg, rgba(51,58,67,0.35) 1px, transparent 1px);
  background-size: 18px 18px;
}
.product-frame { position: absolute; inset: 12px; }
.product-image {
  width: 100%; height: 100%; object-fit: contain;
  min-width: 0; min-height: 0; padding: 6px;
  filter: drop-shadow(0 6px 14px rgba(0,0,0,0.4));
}
.frame-tick { position: absolute; width: 12px; height: 12px; pointer-events: none; }
.frame-tick::before, .frame-tick::after { content: ''; position: absolute; background: var(--rust); }
.frame-tick::before { width: 12px; height: 1.4px; }
.frame-tick::after { width: 1.4px; height: 12px; }
.frame-tick.tl { top: 0; left: 0; }
.frame-tick.tr { top: 0; right: 0; }
.frame-tick.tr::before { right: 0; } .frame-tick.tr::after { right: 0; }
.frame-tick.bl { bottom: 0; left: 0; }
.frame-tick.bl::before { bottom: 0; } .frame-tick.bl::after { bottom: 0; }
.frame-tick.br { bottom: 0; right: 0; }
.frame-tick.br::before { bottom: 0; right: 0; } .frame-tick.br::after { bottom: 0; right: 0; }

.product-body { padding: 18px 18px 20px; display: flex; flex-direction: column; flex: 1; }
.product-topline { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; margin-bottom: 10px; min-height: 22px; }
.product-flag {
  font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.08em;
  background: var(--rust); color: #14100d; font-weight: 600;
  padding: 3px 10px; border-radius: 2px;
}
.price-hint {
  font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.04em;
  color: var(--ink-dim); border: 1px solid var(--line-2); border-radius: 2px; padding: 2px 9px;
}
.zone-tag {
  font-size: 12px; color: var(--rust-bright); font-weight: 600;
  border: 1px solid var(--rust); border-radius: 2px; padding: 2px 9px;
  display: inline-flex; align-items: center; gap: 7px;
}
.zone-tag-lab {
  font-family: var(--font-mono); font-size: 9px; letter-spacing: 0.1em;
  color: var(--ink-faint); font-weight: 400;
}
.product-name {
  font-size: 15px; line-height: 1.55; font-weight: 600; color: var(--ink);
  margin-bottom: 14px; letter-spacing: 0.01em;
}

/* chair spec block (構造の4軸) */
.spec-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 1px;
  background: var(--line); border: 1px solid var(--line);
  border-radius: var(--radius); overflow: hidden; margin-bottom: 15px;
}
.spec-cell { background: var(--graphite-4); padding: 8px 11px; }
.spec-key {
  font-family: var(--font-mono); font-size: 10px; letter-spacing: 0.08em;
  color: var(--ink-faint); margin-bottom: 3px;
}
.spec-val { font-size: 13px; color: var(--ink); font-weight: 500; line-height: 1.4; }

.part-fill {
  font-family: var(--font-mono); font-size: 11.5px; letter-spacing: 0.02em;
  color: var(--ink-dim); background: var(--graphite-4);
  border: 1px solid var(--line); border-radius: var(--radius);
  padding: 7px 11px; margin-bottom: 13px;
}
.product-reason { font-size: 13.5px; color: var(--ink-dim); line-height: 1.85; margin-bottom: 18px; flex: 1; }

/* offers */
.offers { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-top: auto; }
.offer {
  position: relative; text-decoration: none; border-radius: var(--radius);
  padding: 11px 12px 10px; display: flex; flex-direction: column; gap: 2px;
  border: 1px solid var(--line-2); transition: 0.2s;
}
.offer--amazon { background: var(--rust); border-color: var(--rust); color: #14100d; }
.offer--amazon:hover { background: var(--rust-bright); transform: translateY(-1px); }
.offer--rakuten { background: transparent; color: var(--ink); }
.offer--rakuten:hover { border-color: var(--rakuten); color: #fff; background: rgba(178,74,58,0.14); }
.offer-store { font-family: var(--font-mono); font-weight: 600; font-size: 14px; letter-spacing: 0.04em; }
.offer-go { font-size: 11.5px; opacity: 0.9; display: inline-flex; align-items: center; gap: 5px; }
.offer--amazon .offer-go { color: #2a1e14; }
.offer-arrow { transition: transform 0.2s; }
.offer:hover .offer-arrow { transform: translateX(3px); }
.pr-tag {
  position: absolute; top: 6px; right: 7px;
  font-family: var(--font-mono); font-size: 8.5px; letter-spacing: 0.06em;
  padding: 1px 4px; border-radius: 2px; opacity: 0.72;
}
.offer--amazon .pr-tag { background: rgba(20,16,13,0.28); color: #1a1410; }
.offer--rakuten .pr-tag { border: 1px solid var(--line-2); color: var(--ink-faint); }
.offer-note { font-size: 11px; color: var(--ink-faint); margin-top: 9px; line-height: 1.6; }

/* ---------- approach ---------- */
.approach { border-bottom: 1px solid var(--line); }
.approach .wrap { display: grid; grid-template-columns: 1.5fr 1fr; gap: clamp(28px, 5vw, 60px); align-items: center; }
.approach-body p { color: var(--ink-dim); margin-bottom: 15px; max-width: 40em; }
.approach-body strong { color: var(--ink); font-weight: 600; }
.approach-figure {
  border: 1px solid var(--line-2); border-radius: var(--radius);
  background: var(--graphite-3); padding: 44px 20px; text-align: center;
  position: relative;
}
.approach-figure .mark {
  font-size: clamp(72px, 12vw, 120px); font-weight: 700; color: var(--rust);
  display: block; line-height: 1; letter-spacing: 0.05em;
}
.approach-figure p {
  font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.24em;
  color: var(--ink-faint); margin-top: 14px;
}

/* ---------- disclosure ---------- */
.section-disclosure { background: var(--graphite-2); }
.disclosure-block p { color: var(--ink-dim); font-size: 14px; margin-bottom: 15px; line-height: 1.9; }
.disclosure-block a { color: var(--rust-bright); }
.disclosure-block strong { color: var(--ink); }
.amazon-required {
  border-top: 1px solid var(--line); padding-top: 16px; margin-top: 8px;
  font-family: var(--font-mono); font-size: 13px !important; color: var(--ink) !important;
  letter-spacing: 0.02em;
}

/* ---------- footer ---------- */
.site-footer {
  background: var(--graphite);
  border-top: 1px solid var(--line-2);
  padding: clamp(48px, 7vw, 76px) 0 40px; text-align: center;
}
.footer-brand { font-size: 24px; font-weight: 700; letter-spacing: 0.16em; color: var(--ink); }
.footer-tagline { font-family: var(--font-mono); color: var(--rust-bright); letter-spacing: 0.2em; font-size: 12px; margin-top: 6px; }
.footer-meta { font-size: 12px; color: var(--ink-faint); margin: 26px auto; max-width: 640px; line-height: 1.9; }
.footer-meta strong { color: var(--ink-dim); }
.footer-nav { display: flex; flex-wrap: wrap; justify-content: center; gap: 8px 22px; margin-bottom: 24px; }
.footer-nav a { color: var(--ink-dim); text-decoration: none; font-size: 13px; letter-spacing: 0.04em; }
.footer-nav a:hover { color: var(--rust-bright); }
.footer-updated, .footer-copy { font-family: var(--font-mono); font-size: 11px; color: var(--ink-faint); letter-spacing: 0.06em; }
.footer-updated { margin-bottom: 6px; }

/* ---------- responsive ---------- */
@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; }
  .hero-figure { order: -1; max-width: 560px; }
  .reasons { grid-template-columns: 1fr; }
  .approach .wrap { grid-template-columns: 1fr; }
  .legend-list { grid-template-columns: 1fr; }
  .nav-toggle { display: block; }
  .nav {
    position: absolute; top: 100%; right: 0; left: 0;
    flex-direction: column; align-items: flex-start; gap: 0;
    background: var(--graphite-2); border-bottom: 1px solid var(--line-2);
    max-height: 0; overflow: hidden; transition: max-height 0.3s ease;
  }
  .nav[data-open="true"] { max-height: 340px; }
  .nav a { width: 100%; padding: 14px var(--gutter); border-top: 1px solid var(--line); }
  .nav a::after { display: none; }
}
@media (max-width: 560px) {
  body { font-size: 15px; }
  .product-list { grid-template-columns: 1fr; }
  .product { max-width: none; }
  .ba { flex-direction: column; gap: 12px; }
  .ba-panel { width: min(320px, 86vw); }
  .ba-arrow { transform: rotate(90deg); }
  .hero-actions .btn { flex: 1; justify-content: center; }
  .stratum-head { flex-direction: column; gap: 12px; }
  .stratum-code { flex-direction: row; align-items: center; gap: 10px; min-width: 0; align-self: flex-start; }
  .stratum-code-zone { margin-top: 0; }
  .section-cap { flex-direction: column; gap: 2px; }
}

@media (prefers-reduced-motion: reduce) {
  * { scroll-behavior: auto !important; }
  .stratum { transition: none; opacity: 1; transform: none; }
}