/* =========================================================================
   BROS CUBE / ZUM  —  Design System
   コンセプト: 精密機械の設計図。ネイビー×真鍮、和文ゴシック＋技術モノスペース。
   ========================================================================= */

:root {
  color-scheme: light;

  /* color — モノクローム（ロゴの純黒・幾何学を踏襲）*/
  --ink: #14161a;          /* 文字・骨格（ほぼ黒、わずかに温かい）*/
  --navy: #14161a;         /* 旧ブランド色は ink に統合 */
  --navy-deep: #0d1830;    /* CTA帯・フッタ・反転表示の地（深紺）*/
  --navy-700: #000000;
  --brass: #71717a;        /* 旧アクセント色 → ニュートラルなミュートグレー */
  --brass-bright: #ffffff;
  --brass-soft: #e4e4e7;
  --bg: #ffffff;
  --bg-alt: #f5f5f4;       /* 温かい淡グレー */
  --bg-grid: #e7e5e4;
  --line: #d4d4d8;
  --line-strong: #a1a1aa;
  --muted: #71717a;
  --note: #8a4a2a;         /* 注記テキスト用の控えめな鈍い赤茶 */
  --on-navy: #f1f2f4;
  --on-navy-muted: #a1a1aa;

  /* キーカラー — 深紺。CTA・セクション罫線・hoverに限定使用 */
  --accent: #1b2d4d;
  --accent-dark: #0f1d38;
  --accent-soft: #e4eaf3;

  /* type */
  --sans: "Noto Sans JP", system-ui, -apple-system, "Hiragino Kaku Gothic ProN", Meiryo, sans-serif;
  --display: "Zen Kaku Gothic New", "Noto Sans JP", system-ui, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;
  --en-display: "Big Shoulders Display", "IBM Plex Mono", sans-serif;

  /* metrics */
  --max: 1180px;
  --gut: clamp(18px, 4vw, 40px);
  --head-h: 76px;
  --radius: 3px;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--head-h) + 12px);
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-weight: 400;
  line-height: 1.85;
  letter-spacing: 0.01em;
  font-feature-settings: "palt" 1;
  -webkit-font-smoothing: antialiased;
}

img { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
button, input, select, textarea { font: inherit; color: inherit; }

/* ---- type scale ------------------------------------------------------- */
h1, h2, h3, h4 {
  margin: 0;
  font-family: var(--display);
  font-weight: 700;
  line-height: 1.32;
  letter-spacing: -0.01em;
  /* 日本語の禁則処理 — 一文字孤立行を防ぐ */
  text-wrap: balance;
  line-break: strict;
  word-break: auto-phrase;
}
h1 { font-size: clamp(2.1rem, 1.4rem + 3.4vw, 3.4rem); font-weight: 900; line-height: 1.16; letter-spacing: -0.02em; }
h2 { font-size: clamp(1.7rem, 1.2rem + 2vw, 2.4rem); font-weight: 900; letter-spacing: -0.015em; line-height: 1.28; }
h3 { font-size: clamp(1.15rem, 1rem + 0.5vw, 1.35rem); font-weight: 700; }
.hero-lead, .sec-lead, .hero p, p.lead { text-wrap: pretty; line-break: strict; }
p { margin: 0; }

/* ---- a11y helpers ----------------------------------------------------- */
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}
.skip-link {
  position: fixed; top: 8px; left: 8px; z-index: 200;
  transform: translateY(-200%);
  padding: 10px 16px; background: var(--navy-deep); color: #fff;
  border-radius: var(--radius); font-size: 0.9rem; transition: transform .2s;
}
.skip-link:focus { transform: translateY(0); }

:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* =========================================================================
   Layout primitives
   ========================================================================= */
.container { max-width: var(--max); margin-inline: auto; padding-inline: var(--gut); }

.section { padding-block: clamp(58px, 4rem + 3vw, 108px); }
.section--alt { background: var(--bg-alt); }
.section--navy {
  background:
    linear-gradient(0deg, rgba(255,255,255,.02), rgba(255,255,255,.02)),
    var(--navy-deep);
  color: var(--on-navy);
}
.section--navy h1, .section--navy h2, .section--navy h3 { color: #fff; }
.section--navy p { color: var(--on-navy-muted); }

/* faint blueprint grid for navy sections */
.section--navy {
  background-image:
    linear-gradient(rgba(255,255,255,.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.04) 1px, transparent 1px),
    linear-gradient(0deg, var(--navy-deep), var(--navy-deep));
  background-size: 40px 40px, 40px 40px, 100% 100%;
}

.muted { color: var(--muted); }
.note {
  display: block; margin-top: 14px; color: var(--note);
  font-size: 0.85rem; line-height: 1.7;
}
.note::before { content: "※ "; }

/* =========================================================================
   Numbered section head  (番号インデックス + 和文ラベル + H2 + リード)
   ========================================================================= */
.sec-head { max-width: 760px; margin-bottom: clamp(34px, 4vw, 52px); }
.sec-kicker {
  display: flex; align-items: flex-start; gap: 18px;
  margin-bottom: 26px;
}
.sec-index { display: none; }
.sec-rule { flex: 0 0 56px; height: 3px; background: var(--accent); margin-top: 22px; }
.sec-label { display: flex; flex-direction: column; gap: 6px; }
.sec-label .en {
  font-family: var(--en-display); font-weight: 800;
  font-size: clamp(1.7rem, 1.2rem + 1.6vw, 2.4rem);
  letter-spacing: 0.06em; color: var(--ink); line-height: .92;
  text-transform: uppercase;
}
.sec-label .ja {
  font-family: var(--display); font-weight: 600; font-size: 0.82rem;
  letter-spacing: 0.06em; color: var(--muted);
}
/* Legacy bare-text fallback (when no .en/.ja children) */
.sec-label:not(:has(.en)):not(:has(.ja)) {
  font-family: var(--display); font-weight: 800; font-size: 0.88rem; letter-spacing: 0.08em;
  color: var(--ink);
}
.section--navy .sec-label .en { color: #fff; }
.section--navy .sec-label .ja { color: var(--on-navy-muted); }
.sec-head h2 { margin-bottom: 16px; }
.sec-lead { color: var(--muted); font-size: 1.02rem; max-width: 64ch; }
.section--navy .sec-lead { color: var(--on-navy-muted); }

/* =========================================================================
   Dimension line motif  (寸法線: 両端チック + モノ数値)
   ========================================================================= */
.dimline {
  position: relative; height: 1px; background: var(--brass);
  margin-block: 12px;
}
.dimline::before, .dimline::after {
  content: ""; position: absolute; top: -4px; width: 1px; height: 9px;
  background: var(--brass);
}
.dimline::before { left: 0; }
.dimline::after { right: 0; }
.dim-tag {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.1em;
  color: var(--muted);
}

/* =========================================================================
   Buttons
   ========================================================================= */
.btn {
  --b: var(--navy);
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  min-height: 52px; padding: 13px 26px;
  border: 1px solid transparent; border-radius: var(--radius);
  font-family: var(--display); font-weight: 700; font-size: 0.98rem;
  letter-spacing: 0.01em; cursor: pointer; white-space: nowrap;
  transition: background .18s, border-color .18s, color .18s, box-shadow .18s, transform .18s;
}
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-dark); box-shadow: 0 8px 22px rgba(13,24,48,.30); }
.btn-outline { background: #fff; border-color: var(--line-strong); color: var(--ink); }
.btn-outline:hover { border-color: var(--ink); box-shadow: inset 0 -2px 0 0 var(--accent); }
.section--navy .btn-outline { background: transparent; border-color: rgba(255,255,255,.4); color: #fff; }
.section--navy .btn-outline:hover { border-color: var(--brass-bright); box-shadow: inset 0 -2px 0 0 var(--brass-bright); }
.btn-arrow::after { content: "→"; font-family: var(--mono); font-weight: 400; }
.btn-ghost {
  background: rgba(255,255,255,.05); border-color: rgba(255,255,255,.45); color: #fff;
  backdrop-filter: blur(4px);
}
.btn-ghost:hover { background: rgba(255,255,255,.14); border-color: #fff; }

/* tags / chips */
.tag {
  display: inline-flex; align-items: center; min-height: 28px;
  padding: 3px 11px; border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--bg-alt); color: var(--navy);
  font-family: var(--sans); font-weight: 500; font-size: 0.78rem; letter-spacing: 0.02em;
}

/* =========================================================================
   Header
   ========================================================================= */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,.96);
  border-bottom: 1px solid var(--line);
}
.header-inner {
  display: flex; align-items: center; gap: 24px;
  max-width: var(--max); margin-inline: auto;
  min-height: var(--head-h); padding-inline: var(--gut);
}
.brand { display: inline-flex; align-items: center; gap: 12px; margin-right: auto; }
.brand-mark {
  display: grid; place-items: center; width: 42px; height: 42px;
  background: var(--navy-deep); color: #fff;
  font-family: var(--mono); font-weight: 500; font-size: 0.95rem;
  border-radius: var(--radius); letter-spacing: 0.02em;
}
.brand-logo { display: block; height: 32px; width: auto; max-width: min(56vw, 240px); }
.footer-logo { display: block; height: 36px; width: auto; max-width: 260px; margin-bottom: 18px; filter: brightness(0) invert(1) opacity(.95); }
.footer-maker { font-size: 0.76rem !important; color: var(--on-navy-muted) !important; margin-top: 12px !important; max-width: 38ch; line-height: 1.7; }
.phero .code + .phero-sub { font-family: var(--display); font-weight: 500; font-size: 1.1rem; color: var(--ink); margin: 8px 0 8px; letter-spacing: 0.005em; }
.brand-text strong { display: block; font-family: var(--display); font-weight: 700; font-size: 1rem; line-height: 1.2; }
.brand-text small { display: block; color: var(--muted); font-size: 0.74rem; line-height: 1.3; white-space: nowrap; letter-spacing: 0.02em; }

.site-nav { display: flex; align-items: center; gap: 4px; }
.site-nav > a {
  padding: 10px 12px; color: var(--ink); font-size: 0.9rem; font-weight: 500;
  border-radius: var(--radius); white-space: nowrap;
  position: relative;
}
.site-nav > a::after {
  content: ""; position: absolute; left: 12px; right: 12px; bottom: 6px;
  height: 1.5px; background: var(--accent); transform: scaleX(0); transform-origin: left;
  transition: transform .2s;
}
.site-nav > a:hover::after, .site-nav > a[aria-current="page"]::after { transform: scaleX(1); }
.nav-cta-group { display: inline-flex; gap: 8px; margin-left: 10px; }
.nav-cta-group .btn { min-height: 42px; padding: 8px 16px; font-size: 0.86rem; }

.nav-toggle {
  display: none; width: 46px; height: 46px; padding: 0;
  border: 1px solid var(--line); border-radius: var(--radius);
  background: #fff; cursor: pointer;
}
.nav-toggle span:not(.sr-only) {
  display: block; width: 20px; height: 1.5px; margin: 4px auto; background: var(--ink);
  transition: transform .2s, opacity .2s;
}
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(5.5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-5.5px) rotate(-45deg); }

/* =========================================================================
   Breadcrumb
   ========================================================================= */
.breadcrumb {
  max-width: var(--max); margin-inline: auto; padding: 16px var(--gut) 0;
  font-family: var(--sans); font-size: 0.8rem; color: var(--muted);
  letter-spacing: 0.02em;
}
.breadcrumb a:hover { color: var(--navy); }
.breadcrumb span { color: var(--line-strong); margin-inline: 8px; }
.breadcrumb [aria-current="page"] { color: var(--ink); }

/* =========================================================================
   Hero  (トップ — 全面写真背景)
   ========================================================================= */
.hero {
  position: relative; overflow: hidden; isolation: isolate;
  min-height: clamp(560px, 78svh, 760px);
  color: #fff;
}
.hero-bg { position: absolute; inset: 0; z-index: 0; pointer-events: none; }
.hero-bg img { width: 100%; height: 100%; object-fit: cover; object-position: 65% 50%; display: block; }
.hero-bg::after {
  content: ""; position: absolute; inset: 0;
  background:
    linear-gradient(95deg, rgba(13,24,48,.85) 0%, rgba(13,24,48,.62) 32%, rgba(13,24,48,.18) 58%, rgba(13,24,48,.05) 88%),
    linear-gradient(180deg, rgba(13,24,48,.15) 0%, rgba(13,24,48,0) 25%, rgba(13,24,48,0) 75%, rgba(13,24,48,.35) 100%);
}
.hero-content {
  position: relative; z-index: 1;
  display: flex; flex-direction: column; justify-content: flex-end;
  width: 100%;
  min-height: inherit;
  padding-block: clamp(80px, 12vh, 120px);
}
.hero-content > .container {
  width: 100%;                        /* 親の全幅を取る → max-width で 1180 にクランプ → margin auto で下層と同じ中央寄せ */
  box-sizing: border-box;
}
.hero-content > .container > * { max-width: 640px; }
.hero h1 { color: #fff; max-width: 22ch; }
.hero .hero-lead { color: rgba(255,255,255,.86); max-width: 36em; }
.hero .hero-kicker {
  display: inline-flex; align-items: center; gap: 14px;
  margin-bottom: 28px; padding: 0;
}
.hero .hero-kicker .rule { flex: 0 0 32px; height: 2px; background: rgba(255,255,255,.55); }
.hero .hero-kicker .en {
  font-family: var(--en-display); font-weight: 700; font-size: 1.1rem;
  letter-spacing: 0.18em; color: #fff; text-transform: uppercase;
}
.hero .hero-kicker .ja {
  font-family: var(--display); font-weight: 600; font-size: 0.84rem; letter-spacing: 0.04em;
  color: rgba(255,255,255,.74);
}
.hero-inner {
  position: relative; z-index: 1;
  max-width: var(--max); margin-inline: auto; padding: clamp(40px, 5vw, 72px) var(--gut) clamp(48px, 5vw, 76px);
  display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.02fr);
  gap: clamp(28px, 4vw, 56px); align-items: center;
}
.hero-copy { max-width: 600px; }
.hero-kicker {
  display: inline-flex; align-items: center; gap: 10px; margin-bottom: 22px;
  font-family: var(--mono); font-size: 0.78rem; letter-spacing: 0.14em; color: var(--muted);
}
.hero-kicker b { color: var(--ink); font-weight: 700; }
.hero h1 { margin-bottom: 22px; }
.hero h1 .accent { color: var(--navy); position: relative; }
.hero-lead { color: var(--muted); font-size: 1.06rem; margin-bottom: 30px; max-width: 34em; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 30px; }

.spec-strip {
  display: grid; grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--line);
}
.spec-strip div { padding: 16px 4px 0; border-right: 1px solid var(--line); }
.spec-strip div:last-child { border-right: 0; }
.spec-strip dt {
  font-family: var(--display); font-weight: 900; font-size: clamp(1.1rem, 1rem + 0.6vw, 1.45rem);
  color: var(--navy); line-height: 1.1; font-variant-numeric: tabular-nums;
}
.spec-strip dd { margin: 6px 0 0; font-family: var(--mono); font-size: 0.72rem; color: var(--muted); letter-spacing: 0.03em; }

.hero-media { position: relative; }
.hero-media .frame {
  position: relative; border: 1px solid var(--line); background: #fff;
  border-radius: var(--radius); overflow: hidden;
  box-shadow: 0 30px 60px -30px rgba(20,22,26,.3);
}
.hero-media img { width: 100%; aspect-ratio: 16 / 11; object-fit: cover; }
.hero-media .caption {
  position: absolute; left: 0; bottom: 0;
  padding: 10px 16px; background: var(--ink); color: #fff;
  font-family: var(--mono); font-size: 0.82rem; letter-spacing: 0.08em;
}
.hero-dim {
  display: flex; align-items: center; gap: 12px; margin-top: 14px;
  font-family: var(--mono); font-size: 0.72rem; color: var(--muted); letter-spacing: 0.08em;
}
.hero-dim .dimline { flex: 1; margin: 0; }

/* =========================================================================
   Issue rows (課題) — 罫線区切り、カードにしない
   ========================================================================= */
.issue-list { border-top: 1px solid var(--line); }
.issue-list .row {
  display: grid; grid-template-columns: 64px 1fr; gap: clamp(16px, 3vw, 40px);
  align-items: start; padding: clamp(22px, 3vw, 34px) 0; border-bottom: 1px solid var(--line);
}
.issue-list .num { font-family: var(--mono); font-size: 1.6rem; color: var(--brass); font-weight: 500; line-height: 1; }
.issue-list h3 { margin-bottom: 8px; }
.issue-list p { color: var(--muted); max-width: 60ch; }

/* =========================================================================
   Split (解決価値) — 非対称2カラム + ベネフィット
   ========================================================================= */
.split { display: grid; grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr); gap: clamp(28px, 5vw, 64px); align-items: start; }
.benefit-list { display: grid; gap: 0; border-top: 1px solid var(--line); }
.benefit-list .item { display: grid; grid-template-columns: 30px 1fr; gap: 16px; padding: 20px 0; border-bottom: 1px solid var(--line); }
.benefit-list .mk { font-family: var(--mono); color: var(--brass); font-weight: 500; }
.benefit-list strong { display: block; font-family: var(--display); font-weight: 700; font-size: 1.05rem; margin-bottom: 4px; }
.benefit-list span { color: var(--muted); font-size: 0.95rem; }

/* =========================================================================
   Size selector (サイズ診断)
   ========================================================================= */
.selector { display: grid; grid-template-columns: repeat(5, 1fr); gap: 8px; margin-bottom: 26px; }
.selector-card {
  display: flex; flex-direction: column; gap: 6px; align-items: flex-start;
  padding: 22px 20px; background: rgba(20,22,26,.035); border: none;
  text-align: left; cursor: pointer; transition: background .18s;
}
.selector-card .use { font-size: 0.82rem; color: var(--muted); line-height: 1.5; }
.selector-card .model { font-family: var(--en-display); font-size: 1.4rem; font-weight: 700; color: var(--ink); letter-spacing: 0.06em; text-transform: uppercase; }
.selector-card:hover { background: rgba(20,22,26,.05); }
.selector-card.is-active { background: var(--navy-deep); }
.selector-card.is-active .use { color: var(--on-navy-muted); }
.selector-card.is-active .model { color: #fff; }
.selector-card.is-active::after { content: ""; }

.model-panel { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr); background: #fff; overflow: hidden; }
.model-panel .copy { padding: clamp(24px, 3vw, 38px); }
.model-panel .copy .code { font-family: var(--en-display); font-size: 1.2rem; font-weight: 700; letter-spacing: 0.1em; color: var(--accent); text-transform: uppercase; }
.model-panel .copy h3 { font-size: clamp(1.3rem, 1.1rem + 1vw, 1.8rem); margin: 8px 0 12px; }
.model-panel .copy p { color: var(--muted); }
.model-panel .pic { background: var(--bg-alt); min-height: 320px; }
.model-panel .pic img { width: 100%; height: 100%; min-height: 320px; object-fit: cover; }

.spec-grid { display: grid; gap: 0; margin-top: 22px; border-top: 1px solid var(--line); }
.spec-grid .r { display: grid; grid-template-columns: 96px 1fr; gap: 14px; padding: 11px 0; border-bottom: 1px solid var(--line); }
.spec-grid dt { font-family: var(--mono); font-size: 0.78rem; color: var(--muted); letter-spacing: 0.04em; }
.spec-grid dd { margin: 0; font-weight: 700; font-variant-numeric: tabular-nums; }

/* =========================================================================
   Compare table (ラインナップ比較)
   ========================================================================= */
.table-wrap { border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.compare { width: 100%; border-collapse: collapse; }
.compare caption { text-align: left; padding: 14px 18px; font-family: var(--mono); font-size: 0.78rem; color: var(--muted); border-bottom: 1px solid var(--line); }
.compare th, .compare td { padding: 15px 18px; text-align: left; vertical-align: top; border-bottom: 1px solid var(--line); font-size: 0.92rem; }
.compare thead th { background: var(--navy-deep); color: #fff; font-family: var(--mono); font-weight: 500; font-size: 0.78rem; letter-spacing: 0.04em; }
.compare tbody th { font-family: var(--en-display); font-weight: 700; font-size: 1.05rem; letter-spacing: 0.06em; color: var(--ink); white-space: nowrap; text-transform: uppercase; }
.compare tbody tr:nth-child(even) { background: var(--bg-alt); }
.compare tbody tr:last-child th, .compare tbody tr:last-child td { border-bottom: 0; }
.compare td.num, .compare td[data-num] { font-variant-numeric: tabular-nums; }

/* card version of table for mobile */
.model-cards { display: none; }

/* =========================================================================
   Feature tabs (機能)
   ========================================================================= */
.feature-wrap { display: grid; grid-template-columns: 220px minmax(0, 1fr); gap: clamp(20px, 3vw, 32px); }
.feature-tabs { display: grid; gap: 6px; align-content: start; }
.feature-tabs button {
  display: flex; align-items: center; gap: 12px;
  padding: 15px 16px; border: 1px solid var(--line); border-radius: var(--radius);
  background: #fff; color: var(--muted); text-align: left; cursor: pointer; font-weight: 700;
  font-family: var(--display); transition: background .18s, color .18s, border-color .18s;
}
.feature-tabs button .t-no { font-family: var(--mono); font-size: 0.78rem; color: var(--brass); font-weight: 500; }
.feature-tabs button:hover { background: var(--bg-alt); color: var(--ink); }
.feature-tabs button.is-active { background: var(--navy-deep); color: #fff; border-color: var(--navy-deep); }
.feature-tabs button.is-active .t-no { color: var(--brass-bright); }

.feature-panel { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: clamp(20px, 3vw, 32px); align-items: stretch; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; background: #fff; }
.feature-panel[hidden] { display: none; }
.feature-panel .copy { padding: clamp(24px, 3vw, 36px); }
.feature-panel .copy .pk { font-family: var(--display); font-weight: 700; font-size: 0.82rem; letter-spacing: 0.06em; color: var(--brass); }
.feature-panel .copy h3 { margin: 8px 0 12px; }
.feature-panel .copy p { color: var(--muted); }
.feature-panel .pic { background: var(--bg-alt); min-height: 300px; }
.feature-panel .pic img { width: 100%; height: 100%; min-height: 300px; object-fit: cover; }

.check-list { list-style: none; padding: 0; margin: 20px 0 0; display: grid; gap: 10px; }
.check-list li { position: relative; padding-left: 26px; color: var(--muted); font-size: 0.95rem; }
.check-list li::before { content: "—"; position: absolute; left: 0; color: var(--brass); font-family: var(--mono); }

/* =========================================================================
   Usecases (導入シーン)
   ========================================================================= */
.usecase-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: clamp(20px, 2.5vw, 32px); }
.usecase { display: flex; flex-direction: column; background: transparent; }
.usecase img { width: 100%; aspect-ratio: 4 / 3; object-fit: cover; }
.usecase .body { padding: 18px 0 0; display: flex; flex-direction: column; gap: 8px; flex: 1; }
.usecase h3 { font-size: 1.2rem; }
.usecase p { color: var(--muted); font-size: 0.94rem; }
/* use-case 内部のタグ：枠なし、アクセント色の小キャプションに */
.usecase .tag {
  align-self: flex-start;
  padding: 0; background: transparent; border: 0;
  color: var(--accent);
  font-family: var(--display); font-weight: 700; font-size: 0.8rem;
  letter-spacing: 0.06em;
}

/* =========================================================================
   Generic feature/spec/option cards used on product pages
   ========================================================================= */
.col-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: clamp(16px, 2vw, 20px); }
.col-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: clamp(20px, 3vw, 32px); align-items: start; }
.card {
  border: 1px solid var(--line); border-radius: var(--radius); background: #fff;
  padding: clamp(20px, 2.5vw, 28px);
}
.card .num { font-family: var(--mono); color: var(--brass); font-size: 0.85rem; }
.card h3 { margin: 6px 0 8px; font-size: 1.1rem; }
.card p { color: var(--muted); font-size: 0.93rem; }

.tag-row { display: flex; flex-wrap: wrap; gap: 8px; }

/* product hero */
.phero { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr); gap: clamp(26px, 4vw, 52px); align-items: center; }
.phero .code { font-family: var(--en-display); font-weight: 700; font-size: 1.15rem; letter-spacing: 0.1em; color: var(--accent); text-transform: uppercase; }
.phero h1 { margin: 10px 0 14px; }
.phero .lead { color: var(--muted); font-size: 1.04rem; margin-bottom: 22px; }
.phero .chips { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 26px; }
.phero-media { border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; box-shadow: 0 30px 60px -34px rgba(20,22,26,.32); }
.phero-media img { width: 100%; aspect-ratio: 4 / 3; object-fit: cover; }

/* product lineup cards */
.prod-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: clamp(16px, 2vw, 22px); }
a.prod-card { display: flex; flex-direction: column; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; background: #fff; transition: border-color .18s, box-shadow .18s, transform .18s; }
a.prod-card:hover { border-color: var(--navy); box-shadow: 0 18px 34px -24px rgba(20,22,26,.55); transform: translateY(-2px); }
.prod-card img { width: 100%; aspect-ratio: 4 / 3; object-fit: cover; background: var(--bg-alt); }
.prod-card .body { display: flex; flex-direction: column; gap: 8px; padding: 20px; flex: 1; }
.prod-card .code { font-family: var(--en-display); font-weight: 700; font-size: 1.25rem; letter-spacing: 0.08em; color: var(--ink); text-transform: uppercase; }
.prod-card h3 { font-size: 1.08rem; }
.prod-card p { color: var(--muted); font-size: 0.9rem; }
.prod-card .meta { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 2px; }
.prod-card .more { margin-top: auto; padding-top: 8px; font-family: var(--mono); font-size: 0.82rem; color: var(--brass); }

/* model nav (other sizes) */
.model-nav { display: flex; flex-wrap: wrap; gap: 10px; }
.model-nav a { font-family: var(--en-display); font-weight: 700; font-size: 1rem; letter-spacing: 0.06em; padding: 11px 18px; border: 1px solid var(--line); border-radius: var(--radius); color: var(--ink); text-transform: uppercase; transition: border-color .18s, box-shadow .18s, background .18s; }
.model-nav a:hover { border-color: var(--ink); box-shadow: inset 0 -2px 0 0 var(--accent); }
.model-nav a[aria-current="page"] { background: var(--accent); color: #fff; border-color: var(--accent); }

/* =========================================================================
   Flow (導入の流れ)
   ========================================================================= */
.flow { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(5, 1fr); gap: 0; counter-reset: flow; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.flow li { counter-increment: flow; padding: 24px 20px; border-right: 1px solid var(--line); background: #fff; }
.flow li:last-child { border-right: 0; }
.flow li::before { content: counter(flow, decimal-leading-zero); display: block; font-family: var(--mono); font-size: 1.1rem; color: var(--brass); margin-bottom: 14px; }
.flow strong { display: block; font-family: var(--display); font-weight: 700; margin-bottom: 6px; }
.flow span { color: var(--muted); font-size: 0.88rem; }

/* =========================================================================
   FAQ
   ========================================================================= */
.faq { display: grid; gap: 0; border-top: 1px solid var(--line); }
.faq details { border-bottom: 1px solid var(--line); }
.faq summary {
  display: flex; align-items: center; gap: 16px; padding: 20px 8px; cursor: pointer;
  font-family: var(--display); font-weight: 700; font-size: 1.02rem; list-style: none;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary .q { font-family: var(--mono); color: var(--brass); font-size: 0.9rem; }
.faq summary .sign { margin-left: auto; font-family: var(--mono); color: var(--navy); font-size: 1.2rem; transition: transform .2s; }
.faq details[open] summary .sign { transform: rotate(45deg); }
.faq .a { padding: 0 8px 22px 50px; color: var(--muted); }

/* =========================================================================
   Forms
   ========================================================================= */
.cta-split { display: grid; grid-template-columns: minmax(0, 0.85fr) minmax(0, 1fr); gap: clamp(28px, 4vw, 56px); align-items: start; }
.lead-form { display: grid; gap: 14px; padding: clamp(22px, 3vw, 30px); border: 1px solid var(--line); border-radius: var(--radius); background: #fff; }
.section--navy .lead-form { background: rgba(255,255,255,.05); border-color: rgba(255,255,255,.18); }
.lead-form label { display: grid; gap: 7px; font-size: 0.85rem; font-weight: 700; color: var(--muted); }
.section--navy .lead-form label { color: var(--on-navy); }
.lead-form input:not([type="checkbox"]):not([type="radio"]),
.lead-form select,
.lead-form textarea {
  width: 100%; min-height: 50px; padding: 12px 14px;
  border: 1px solid var(--line); border-radius: var(--radius); background: #fff; color: var(--ink);
}
.lead-form textarea { min-height: 130px; resize: vertical; }
.lead-form input:focus, .lead-form select:focus, .lead-form textarea:focus { border-color: var(--navy); outline: 2px solid rgba(27,58,107,.14); outline-offset: 0; }
.form-msg { min-height: 22px; margin: 0; font-family: var(--mono); font-size: 0.85rem; color: var(--brass); }
.section--navy .form-msg { color: var(--brass-bright); }

/* ----- checkbox group (お問い合わせ種別) ----- */
.checkbox-group { border: 0; padding: 0; margin: 0 0 6px; }
.checkbox-group legend {
  display: block; padding: 0; margin-bottom: 12px;
  font-size: 0.85rem; font-weight: 700; color: var(--muted);
}
.checkbox-group legend span {
  font-weight: 400; opacity: .75; font-size: 0.78rem; margin-left: 6px;
}
.checkbox-group .check {
  display: flex; align-items: center; gap: 12px;
  cursor: pointer; padding: 12px 14px; margin: 0 0 8px;
  background: rgba(255,255,255,.05);
  border: 1px solid rgba(255,255,255,.18);
  border-radius: var(--radius);
  font-size: 0.95rem; font-weight: 500; color: rgba(255,255,255,.88);
  transition: background .15s, border-color .15s, color .15s;
}
.checkbox-group .check:hover { background: rgba(255,255,255,.12); border-color: rgba(255,255,255,.32); color: #fff; }
.checkbox-group .check:has(input:checked) {
  background: rgba(255,255,255,.16);
  border-color: rgba(255,255,255,.6);
  color: #fff;
}
.checkbox-group .check input[type="checkbox"] {
  appearance: none; -webkit-appearance: none;
  width: 18px; height: 18px;
  border: 1.5px solid rgba(255,255,255,.6); border-radius: 2px;
  background: transparent;
  cursor: pointer; position: relative;
  flex: 0 0 auto;
}
.checkbox-group .check input[type="checkbox"]:checked { background: #fff; border-color: #fff; }
.checkbox-group .check input[type="checkbox"]:checked::after {
  content: ""; position: absolute; left: 5px; top: 1px;
  width: 4px; height: 9px; border: solid var(--accent); border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}

/* light-bg defensive (if used outside .section--navy) */
section:not(.section--navy) .checkbox-group .check {
  background: var(--bg-alt); border-color: var(--line); color: var(--ink);
}
section:not(.section--navy) .checkbox-group .check input[type="checkbox"] {
  border-color: var(--line-strong);
}
section:not(.section--navy) .checkbox-group .check input[type="checkbox"]:checked {
  background: var(--accent); border-color: var(--accent);
}
section:not(.section--navy) .checkbox-group .check input[type="checkbox"]:checked::after { border-color: #fff; }

/* ----- optional marker ----- */
.lead-form .optional {
  font-weight: 400; opacity: .65; font-size: 0.74rem; margin-left: 6px;
}

/* =========================================================================
   Footer
   ========================================================================= */
.site-footer { background: var(--navy-deep); color: var(--on-navy-muted); }
.footer-inner {
  max-width: var(--max); margin-inline: auto; padding: clamp(40px, 5vw, 64px) var(--gut);
  display: grid; grid-template-columns: minmax(0, 1.3fr) minmax(0, 2fr); gap: clamp(28px, 4vw, 56px);
}
.footer-brand .brand-mark { margin-bottom: 14px; }
.footer-brand strong { display: block; font-family: var(--display); color: #fff; font-size: 1.1rem; margin-bottom: 10px; }
.footer-brand p { font-size: 0.88rem; line-height: 1.8; max-width: 36ch; }
.footer-cols { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.footer-cols h3 { font-family: var(--display); font-weight: 700; font-size: 0.82rem; letter-spacing: 0.06em; color: var(--brass-bright); margin-bottom: 14px; }
.footer-cols a { display: block; padding: 5px 0; font-size: 0.9rem; color: var(--on-navy); }
.footer-cols a:hover { color: #fff; text-decoration: underline; text-underline-offset: 3px; text-decoration-color: var(--brass); }
.footer-base { border-top: 1px solid rgba(255,255,255,.12); }
.footer-base small { display: block; max-width: var(--max); margin-inline: auto; padding: 18px var(--gut); font-size: 0.78rem; color: var(--on-navy-muted); }

/* =========================================================================
   Load animation (staggered reveal)
   ========================================================================= */
@media (prefers-reduced-motion: no-preference) {
  .reveal { opacity: 0; transform: translateY(14px); animation: reveal .7s cubic-bezier(.2,.7,.2,1) forwards; }
  .reveal.d1 { animation-delay: .06s; }
  .reveal.d2 { animation-delay: .14s; }
  .reveal.d3 { animation-delay: .22s; }
  .reveal.d4 { animation-delay: .30s; }
  @keyframes reveal { to { opacity: 1; transform: none; } }

  /* scroll reveal hook — only active when JS runs (graceful degradation) */
  .js [data-io] { opacity: 0; transform: translateY(18px); transition: opacity .6s ease, transform .6s cubic-bezier(.2,.7,.2,1); }
  .js [data-io].in { opacity: 1; transform: none; }
}

/* =========================================================================
   Responsive
   ========================================================================= */
@media (max-width: 980px) {
  .hero-inner, .split, .model-panel, .feature-panel, .phero, .cta-split, .footer-inner { grid-template-columns: 1fr; }
  .footer-inner { gap: 32px; }
  .feature-wrap { grid-template-columns: 1fr; }
  .feature-tabs { grid-template-columns: repeat(4, 1fr); }
  .usecase-grid, .col-3, .prod-grid { grid-template-columns: repeat(2, 1fr); }
  .flow { grid-template-columns: repeat(2, 1fr); }
  .flow li:nth-child(2n) { border-right: 0; }
  .flow li { border-bottom: 1px solid var(--line); }

  /* nav drawer */
  .nav-toggle { display: block; }
  .site-nav {
    position: absolute; top: var(--head-h); left: 0; right: 0;
    flex-direction: column; align-items: stretch; gap: 2px;
    padding: 12px var(--gut) 18px; background: #fff; border-bottom: 1px solid var(--line);
    box-shadow: 0 20px 30px -20px rgba(20,22,26,.3);
    display: none;
  }
  .site-nav.is-open { display: flex; }
  .site-nav > a { padding: 13px 8px; }
  .site-nav > a::after { display: none; }
  .nav-cta-group { margin-left: 0; margin-top: 8px; display: grid; grid-template-columns: 1fr 1fr; }
  .nav-cta-group .btn { min-height: 48px; }
}

@media (max-width: 720px) {
  :root { --head-h: 64px; }
  h1 { line-height: 1.28; }
  .brand-text small { display: none; }
  .spec-strip { grid-template-columns: repeat(2, 1fr); }
  .spec-strip div:nth-child(2) { border-right: 0; }
  .spec-strip div:nth-child(-n+2) { border-bottom: 1px solid var(--line); padding-bottom: 14px; }

  .selector { grid-template-columns: 1fr 1fr; }

  .usecase-grid, .col-3, .col-2, .feature-tabs, .flow, .prod-grid { grid-template-columns: 1fr; }
  .flow li { border-right: 0; }
  .issue-list .row { grid-template-columns: 48px 1fr; }
  .hero-actions .btn { flex: 1; }

  /* compare: switch to cards */
  .table-wrap { border: 0; }
  .compare { display: none; }
  .model-cards { display: grid; gap: 14px; }
  .model-cards .mc { border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
  .model-cards .mc h3 { font-family: var(--mono); font-weight: 500; background: var(--navy-deep); color: #fff; padding: 12px 16px; font-size: 1rem; }
  .model-cards .mc dl { margin: 0; padding: 4px 16px 12px; }
  .model-cards .mc .r { display: grid; grid-template-columns: 96px 1fr; gap: 12px; padding: 9px 0; border-bottom: 1px solid var(--line); }
  .model-cards .mc .r:last-child { border-bottom: 0; }
  .model-cards .mc dt { font-family: var(--mono); font-size: 0.74rem; color: var(--muted); }
  .model-cards .mc dd { margin: 0; font-weight: 700; }

  .faq .a { padding-left: 8px; }
}