/* ==========================================================
   Kanawa — 設備保全・点検記録クラウド  共通スタイル
   方針: Trust & Authority(ネイビー基調)+ 製造業の手触り(安全色オレンジ・鋼のグレー)
   ========================================================== */

/* ---------- Design tokens ---------- */
:root {
  --font-body: "Noto Sans JP", "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Yu Gothic", Meiryo, sans-serif;
  --font-num: "Lexend", "Noto Sans JP", sans-serif;

  /* light */
  --c-bg: #F6F5F1;          /* 紙・帳票の生成り */
  --c-surface: #FFFFFF;
  --c-surface-2: #ECEAE4;
  --c-fg: #1A1F27;          /* 本文 15.4:1 */
  --c-fg-2: #4A525E;        /* 補助文 6.9:1 */
  --c-primary: #1B2A41;     /* ネイビー(鋼) */
  --c-on-primary: #FFFFFF;
  --c-accent: #B8400E;      /* 安全色オレンジ(白地で 5.9:1) */
  --c-accent-hover: #9A3409;
  --c-on-accent: #FFFFFF;
  --c-ok: #1E6B3A;
  --c-err: #B42318;
  --c-border: #D6D3CB;
  --c-ring: #0B63CE;
  --c-grid: #E2DFD7;
  --c-check: #1B6E3F;
  --c-band: #1B2A41;        /* CTA帯(ダークでも濃紺を維持) */
  --c-on-band: #FFFFFF;

  --radius-s: 4px;
  --radius-m: 8px;
  --radius-l: 12px;
  --shadow-1: 0 1px 2px rgba(20, 24, 31, .06), 0 1px 4px rgba(20, 24, 31, .06);
  --shadow-2: 0 4px 16px rgba(20, 24, 31, .10);
  --dur: 200ms;
  --ease: cubic-bezier(.2, .7, .3, 1);
  --container: 1120px;
  --header-h: 64px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --c-bg: #13171D;
    --c-surface: #1B2028;
    --c-surface-2: #242A34;
    --c-fg: #E8EAED;         /* 14.6:1 */
    --c-fg-2: #AEB5C0;       /* 7.6:1 */
    --c-primary: #E8EAED;
    --c-on-primary: #13171D;
    --c-accent: #F08A4B;     /* 暗背景で 7.0:1 */
    --c-accent-hover: #F6A46F;
    --c-on-accent: #1A1208;
    --c-ok: #6FCF97;
    --c-err: #F58A80;
    --c-border: #353C48;
    --c-ring: #7CB6FF;
    --c-grid: #2C333E;
    --c-check: #6FCF97;
    --c-band: #0F1A2B;
    --c-on-band: #F2F4F7;
    --shadow-1: 0 1px 2px rgba(0,0,0,.4);
    --shadow-2: 0 6px 20px rgba(0,0,0,.5);
    color-scheme: dark;
  }
}

/* ---------- Reset / base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}
body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  color: var(--c-fg);
  background: var(--c-bg);
  overflow-x: hidden;
  font-feature-settings: "palt";
}
img, svg { max-width: 100%; display: block; }
a { color: inherit; }
h1, h2, h3, h4 { line-height: 1.4; margin: 0; font-weight: 700; letter-spacing: .01em; }
p { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }
button { font: inherit; color: inherit; cursor: pointer; }
input, select, textarea { font: inherit; color: inherit; }
:focus-visible { outline: 3px solid var(--c-ring); outline-offset: 3px; border-radius: var(--radius-s); }
.visually-hidden {
  position: absolute !important; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}
.skip-link {
  position: absolute; left: 12px; top: -60px; z-index: 1000;
  background: var(--c-primary); color: var(--c-on-primary);
  padding: 10px 16px; border-radius: var(--radius-m); font-weight: 700; text-decoration: none;
  transition: top var(--dur) var(--ease);
}
.skip-link:focus { top: 12px; }

.container { width: 100%; max-width: var(--container); margin-inline: auto; padding-inline: 20px; }
@media (min-width: 768px) { .container { padding-inline: 32px; } }

/* type scale */
.h-display { font-size: clamp(30px, 5.2vw, 48px); line-height: 1.3; }
.h-section { font-size: clamp(24px, 3.4vw, 34px); }
.h-card { font-size: 20px; }
.lead { font-size: 18px; color: var(--c-fg-2); }
.eyebrow {
  font-family: var(--font-num); font-size: 13px; letter-spacing: .12em; text-transform: uppercase;
  color: var(--c-accent); font-weight: 600; display: inline-flex; align-items: center; gap: 10px;
}
.eyebrow::before { content: ""; width: 20px; height: 2px; background: currentColor; }
.num { font-family: var(--font-num); font-variant-numeric: tabular-nums; }
.section { padding-block: 64px; }
@media (min-width: 768px) { .section { padding-block: 96px; } }
.section-head { max-width: 720px; margin-bottom: 40px; }
.section-head .h-section { margin-top: 12px; }
.section-head .lead { margin-top: 14px; }
.section--alt { background: var(--c-surface); border-top: 1px solid var(--c-border); border-bottom: 1px solid var(--c-border); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  min-height: 48px; padding: 10px 22px; border-radius: var(--radius-m);
  font-weight: 700; text-decoration: none; border: 2px solid transparent;
  transition: background-color var(--dur) var(--ease), border-color var(--dur) var(--ease), transform var(--dur) var(--ease), color var(--dur) var(--ease);
  white-space: nowrap;
}
.btn:active { transform: translateY(1px); }
.btn--primary { background: var(--c-accent); color: var(--c-on-accent); }
.btn--primary:hover { background: var(--c-accent-hover); }
.btn--secondary { background: transparent; color: var(--c-primary); border-color: var(--c-primary); }
.btn--secondary:hover { background: var(--c-primary); color: var(--c-on-primary); }
.btn--ghost { background: transparent; color: var(--c-fg); padding-inline: 12px; }
.btn--ghost:hover { background: var(--c-surface-2); }
.btn--lg { min-height: 56px; padding-inline: 28px; font-size: 17px; }
.btn--block { width: 100%; }
.btn[disabled], .btn[aria-disabled="true"] { opacity: .5; cursor: not-allowed; }
.btn svg { width: 20px; height: 20px; flex: none; }

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: color-mix(in srgb, var(--c-surface) 92%, transparent);
  backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--c-border);
}
.site-header__inner { display: flex; align-items: center; justify-content: space-between; min-height: var(--header-h); gap: 16px; }
.brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; font-weight: 700; font-size: 20px; letter-spacing: .02em; }
.brand__mark { width: 32px; height: 32px; flex: none; }
.brand__mark .m-bg { fill: var(--c-primary); }
.brand__mark .m-fg { stroke: var(--c-accent); }
.brand__sub { font-size: 12px; font-weight: 500; color: var(--c-fg-2); display: none; }
@media (min-width: 1024px) { .brand__sub { display: inline; margin-left: 4px; } }

.nav-toggle {
  display: inline-flex; align-items: center; justify-content: center;
  width: 48px; height: 48px; border: 1px solid var(--c-border); border-radius: var(--radius-m); background: var(--c-surface);
}
.nav-toggle svg { width: 24px; height: 24px; }
.nav-toggle .ic-close { display: none; }
.nav-toggle[aria-expanded="true"] .ic-menu { display: none; }
.nav-toggle[aria-expanded="true"] .ic-close { display: block; }

.site-nav {
  display: none;
  position: absolute; left: 0; right: 0; top: 100%;
  background: var(--c-surface); border-bottom: 1px solid var(--c-border); box-shadow: var(--shadow-2);
  padding: 8px 20px 20px;
}
.site-nav.is-open { display: block; }
.site-nav__list { display: flex; flex-direction: column; }
.site-nav__list a {
  display: flex; align-items: center; min-height: 48px; padding: 8px 12px; border-radius: var(--radius-m);
  text-decoration: none; font-weight: 500; transition: background-color var(--dur) var(--ease);
}
.site-nav__list a:hover { background: var(--c-surface-2); }
.site-nav__list a[aria-current="page"] { color: var(--c-accent); font-weight: 700; box-shadow: inset 3px 0 0 var(--c-accent); }
.site-nav__cta { margin-top: 12px; display: flex; flex-direction: column; gap: 8px; }

@media (min-width: 768px) {
  .nav-toggle { display: none; }
  .site-nav { display: flex; position: static; background: transparent; border: 0; box-shadow: none; padding: 0; align-items: center; gap: 8px; }
  .site-nav__list { flex-direction: row; gap: 4px; }
  .site-nav__list a { min-height: 44px; padding: 6px 12px; }
  .site-nav__list a[aria-current="page"] { box-shadow: inset 0 -3px 0 var(--c-accent); border-radius: 0; }
  .site-nav__cta { margin: 0 0 0 12px; flex-direction: row; }
  .site-nav__cta .btn { min-height: 42px; padding-inline: 16px; }
}

/* ---------- Hero ---------- */
.hero { position: relative; overflow: hidden; padding-block: 56px 48px; background: var(--c-surface); border-bottom: 1px solid var(--c-border); }
.hero::before {
  /* 帳票の罫線グリッド */
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background-image: linear-gradient(var(--c-grid) 1px, transparent 1px), linear-gradient(90deg, var(--c-grid) 1px, transparent 1px);
  background-size: 48px 48px; opacity: .55;
  -webkit-mask-image: linear-gradient(180deg, rgba(0,0,0,.9), transparent 90%); mask-image: linear-gradient(180deg, rgba(0,0,0,.9), transparent 90%);
}
.hero__grid { position: relative; display: grid; gap: 40px; align-items: center; }
.hero__copy .h-display { margin-top: 16px; }
.hero__copy .lead { margin-top: 20px; }
.hero__actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.hero__meta { display: flex; flex-wrap: wrap; gap: 8px 20px; margin-top: 24px; font-size: 15px; color: var(--c-fg-2); }
.hero__meta li { display: inline-flex; gap: 6px; align-items: center; }
.hero__meta svg { width: 18px; height: 18px; color: var(--c-check); }
@media (min-width: 768px) { .hero { padding-block: 80px; } .hero__grid { grid-template-columns: 1.05fr .95fr; gap: 48px; } }
@media (min-width: 1024px) { .hero { padding-block: 104px 96px; } }

/* 疑似スクリーンショット(CSS/SVGのみ) */
.mock { display: grid; gap: 16px; }
.mock__phone, .mock__pc { background: var(--c-surface); border: 1px solid var(--c-border); border-radius: var(--radius-l); box-shadow: var(--shadow-2); overflow: hidden; }
.mock__pc { grid-column: 1 / -1; }
.mock__bar { display: flex; align-items: center; gap: 6px; padding: 10px 14px; background: var(--c-surface-2); border-bottom: 1px solid var(--c-border); font-size: 12px; color: var(--c-fg-2); }
.mock__bar i { width: 10px; height: 10px; border-radius: 50%; background: var(--c-border); }
.mock__bar span { margin-left: 8px; }
.mock__body { padding: 14px; }
.mock__title { font-size: 13px; font-weight: 700; margin-bottom: 8px; }
.mock__row { display: flex; align-items: center; gap: 8px; padding: 8px 10px; border: 1px solid var(--c-border); border-radius: var(--radius-s); margin-bottom: 6px; font-size: 12px; white-space: nowrap; }
.mock__row .chk { width: 20px; height: 20px; border-radius: 4px; border: 2px solid var(--c-border); flex: none; display: grid; place-items: center; }
.mock__row .chk svg { width: 14px; height: 14px; color: var(--c-check); }
.mock__row .chk.is-on { border-color: var(--c-check); }
.mock__row .val { margin-left: auto; white-space: nowrap; font-family: var(--font-num); font-variant-numeric: tabular-nums; }
.mock__row .val.is-warn { color: var(--c-accent); font-weight: 600; }
.mock__chart { width: 100%; height: auto; }
.mock__chart .grid { stroke: var(--c-grid); }
.mock__chart .line { stroke: var(--c-accent); fill: none; stroke-width: 2.5; stroke-linecap: round; stroke-linejoin: round; }
.mock__chart .area { fill: var(--c-accent); opacity: .12; }
.mock__chart .bar { fill: var(--c-primary); }
.mock__chart .lbl { font-size: 10px; fill: var(--c-fg-2); font-family: var(--font-num); }
.mock__kpis { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; margin-bottom: 10px; }
.mock__kpi { padding: 8px 10px; background: var(--c-surface-2); border-radius: var(--radius-s); }
.mock__kpi b { display: block; font-family: var(--font-num); font-size: 18px; line-height: 1.2; }
.mock__kpi small { font-size: 11px; color: var(--c-fg-2); }
@media (min-width: 480px) { .mock { grid-template-columns: 1fr 1.6fr; } .mock__pc { grid-column: auto; } }

/* ---------- Cards / grids ---------- */
.grid { display: grid; gap: 20px; }
.grid--2 { grid-template-columns: 1fr; }
.grid--3 { grid-template-columns: 1fr; }
.grid--4 { grid-template-columns: 1fr; }
@media (min-width: 600px) { .grid--4 { grid-template-columns: 1fr 1fr; } }
@media (min-width: 768px) { .grid--2 { grid-template-columns: 1fr 1fr; } .grid--3 { grid-template-columns: repeat(3, 1fr); } }
@media (min-width: 1024px) { .grid--4 { grid-template-columns: repeat(4, 1fr); } }

.card {
  background: var(--c-surface); border: 1px solid var(--c-border); border-radius: var(--radius-l);
  padding: 24px; box-shadow: var(--shadow-1); transition: box-shadow var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.card:hover { box-shadow: var(--shadow-2); }
.card__icon {
  width: 48px; height: 48px; border-radius: var(--radius-m); display: grid; place-items: center;
  background: color-mix(in srgb, var(--c-accent) 12%, var(--c-surface)); color: var(--c-accent); margin-bottom: 16px;
}
.card__icon svg { width: 26px; height: 26px; }
.card .h-card { margin-bottom: 8px; }
.card p { color: var(--c-fg-2); }
.card__tag { display: inline-block; font-size: 12px; font-weight: 700; letter-spacing: .06em; padding: 2px 8px; border-radius: 999px; background: var(--c-surface-2); color: var(--c-fg-2); margin-bottom: 10px; }

/* 課題 */
.problem { display: grid; gap: 16px; }
.problem__item { display: grid; grid-template-columns: 56px 1fr; gap: 16px; padding: 20px; background: var(--c-surface); border: 1px solid var(--c-border); border-left: 4px solid var(--c-accent); border-radius: var(--radius-m); }
.problem__no { font-family: var(--font-num); font-size: 28px; font-weight: 600; color: var(--c-accent); line-height: 1; }
.problem__item h3 { font-size: 18px; margin-bottom: 6px; }
.problem__item p { color: var(--c-fg-2); }
@media (min-width: 768px) { .problem { grid-template-columns: repeat(3, 1fr); } .problem__item { grid-template-columns: 1fr; } }

/* 数値 */
.stats { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.stat { padding: 24px 20px; background: var(--c-surface); border: 1px solid var(--c-border); border-radius: var(--radius-l); text-align: center; }
.stat__val { font-family: var(--font-num); font-size: clamp(34px, 5vw, 48px); font-weight: 600; line-height: 1.1; color: var(--c-primary); font-variant-numeric: tabular-nums; }
.stat__val small { font-size: .45em; font-weight: 500; margin-left: 2px; }
.stat__label { margin-top: 8px; font-weight: 700; }
.stat__note { margin-top: 4px; font-size: 14px; color: var(--c-fg-2); }
@media (min-width: 768px) { .stats { grid-template-columns: repeat(4, 1fr); } }

/* 流れ */
.flow { display: grid; gap: 16px; counter-reset: step; }
.flow__step { position: relative; padding: 24px 20px 24px 64px; background: var(--c-surface); border: 1px solid var(--c-border); border-radius: var(--radius-l); }
.flow__step::before {
  counter-increment: step; content: counter(step, decimal-leading-zero);
  position: absolute; left: 20px; top: 24px; font-family: var(--font-num); font-weight: 600; color: var(--c-accent); font-size: 20px;
}
.flow__step h3 { font-size: 18px; margin-bottom: 6px; }
.flow__step p { color: var(--c-fg-2); }
@media (min-width: 768px) { .flow { grid-template-columns: repeat(3, 1fr); } }

/* 事例ティザー */
.case-teaser { display: grid; gap: 16px; }
.case-teaser__item { text-decoration: none; display: grid; gap: 8px; padding: 22px; background: var(--c-surface); border: 1px solid var(--c-border); border-radius: var(--radius-l); transition: border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease); }
.case-teaser__item:hover { border-color: var(--c-accent); box-shadow: var(--shadow-2); }
.case-teaser__co { font-weight: 700; font-size: 18px; }
.case-teaser__ind { font-size: 13px; color: var(--c-fg-2); }
.case-teaser__res { display: flex; align-items: baseline; gap: 8px; margin-top: 4px; }
.case-teaser__res b { font-family: var(--font-num); font-size: 32px; color: var(--c-accent); font-weight: 600; line-height: 1; }
.case-teaser__res span { color: var(--c-fg-2); font-size: 14px; }
.case-teaser__more { color: var(--c-accent); font-weight: 700; font-size: 14px; display: inline-flex; align-items: center; gap: 4px; }
.case-teaser__more svg { width: 16px; height: 16px; }
@media (min-width: 768px) { .case-teaser { grid-template-columns: repeat(3, 1fr); } }

/* ---------- CTA band ---------- */
.cta-band { background: var(--c-band); color: var(--c-on-band); padding-block: 64px; position: relative; overflow: hidden; }
.cta-band::after {
  content: ""; position: absolute; right: -80px; top: -80px; width: 320px; height: 320px; border-radius: 50%;
  border: 40px solid color-mix(in srgb, var(--c-accent) 35%, transparent); pointer-events: none;
  display: none;
}
@media (min-width: 900px) { .cta-band::after { display: block; } }
.cta-band__inner { position: relative; display: grid; gap: 20px; }
.cta-band .h-section { color: inherit; }
.cta-band p { opacity: .9; }
.cta-band__actions { display: flex; flex-wrap: wrap; gap: 12px; }
.cta-band .btn--secondary { color: var(--c-on-band); border-color: var(--c-on-band); }
.cta-band .btn--secondary:hover { background: var(--c-on-band); color: var(--c-band); }
@media (min-width: 768px) { .cta-band__inner { grid-template-columns: 1fr auto; align-items: center; } }

/* ---------- Footer ---------- */
.site-footer { padding-block: 48px 32px; border-top: 1px solid var(--c-border); background: var(--c-surface); font-size: 14px; }
.site-footer__grid { display: grid; gap: 28px; }
.site-footer__col h2 { font-size: 14px; margin-bottom: 10px; color: var(--c-fg-2); letter-spacing: .06em; }
.site-footer__col a { display: inline-flex; min-height: 36px; align-items: center; text-decoration: none; }
.site-footer__col a:hover { color: var(--c-accent); text-decoration: underline; }
.site-footer__brand p { color: var(--c-fg-2); margin-top: 10px; }
.site-footer__bottom { margin-top: 32px; padding-top: 16px; border-top: 1px solid var(--c-border); display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px; color: var(--c-fg-2); }
@media (min-width: 768px) { .site-footer__grid { grid-template-columns: 1.6fr 1fr 1fr 1fr; } }

/* ---------- Page hero(下層) ---------- */
.page-hero { padding-block: 48px 40px; background: var(--c-surface); border-bottom: 1px solid var(--c-border); }
.page-hero .h-display { margin-top: 12px; }
.page-hero .lead { margin-top: 14px; max-width: 720px; }
@media (min-width: 768px) { .page-hero { padding-block: 72px 56px; } }

/* ---------- Pricing ---------- */
.billing-toggle { display: inline-flex; align-items: center; gap: 12px; padding: 6px; background: var(--c-surface-2); border-radius: 999px; margin-bottom: 32px; }
.billing-toggle__btn { min-height: 44px; padding: 8px 20px; border-radius: 999px; border: 0; background: transparent; font-weight: 700; color: var(--c-fg-2); transition: background-color var(--dur) var(--ease), color var(--dur) var(--ease); }
.billing-toggle__btn[aria-pressed="true"] { background: var(--c-surface); color: var(--c-fg); box-shadow: var(--shadow-1); }
.billing-toggle__save { font-size: 12px; font-weight: 700; color: var(--c-ok); padding-right: 10px; }

.plans { display: grid; gap: 20px; align-items: stretch; }
.plan { position: relative; display: flex; flex-direction: column; padding: 28px 24px; background: var(--c-surface); border: 1px solid var(--c-border); border-radius: var(--radius-l); box-shadow: var(--shadow-1); }
.plan--featured { border: 2px solid var(--c-accent); }
.plan__badge { position: absolute; top: -14px; left: 24px; background: var(--c-accent); color: var(--c-on-accent); font-size: 12px; font-weight: 700; padding: 4px 12px; border-radius: 999px; letter-spacing: .06em; }
.plan__name { font-size: 22px; }
.plan__for { color: var(--c-fg-2); font-size: 14px; margin-top: 4px; min-height: 3em; }
.plan__price { margin-top: 18px; display: flex; align-items: baseline; gap: 4px; flex-wrap: wrap; }
.plan__price .amount { font-family: var(--font-num); font-size: 40px; font-weight: 600; line-height: 1; font-variant-numeric: tabular-nums; }
.plan__price .unit { color: var(--c-fg-2); font-size: 14px; }
.plan__price-note { font-size: 14px; color: var(--c-fg-2); margin-top: 6px; min-height: 1.6em; }
.plan__features { margin-top: 20px; padding-top: 20px; border-top: 1px solid var(--c-border); display: grid; gap: 10px; flex: 1; }
.plan__features li { display: flex; gap: 10px; align-items: flex-start; font-size: 15px; }
.plan__features svg { width: 20px; height: 20px; flex: none; margin-top: 3px; color: var(--c-check); }
.plan__features .is-off { color: var(--c-fg-2); }
.plan__features .is-off svg { color: var(--c-border); }
.plan .btn { margin-top: 24px; }
@media (min-width: 768px) { .plans { grid-template-columns: repeat(3, 1fr); } }

.table-wrap { position: relative; overflow-x: auto; -webkit-overflow-scrolling: touch; border: 1px solid var(--c-border); border-radius: var(--radius-l); background: var(--c-surface); }
.compare { width: 100%; min-width: 640px; border-collapse: collapse; font-size: 15px; }
.compare th, .compare td { padding: 14px 16px; border-bottom: 1px solid var(--c-border); text-align: left; vertical-align: middle; }
.compare thead th { background: var(--c-surface-2); font-size: 14px; }
.compare tbody th { font-weight: 500; width: 36%; }
.compare td { text-align: center; }
.compare td svg { width: 20px; height: 20px; margin-inline: auto; }
.compare .yes { color: var(--c-check); }
.compare .no { color: var(--c-fg-2); }
.compare tr:last-child th, .compare tr:last-child td { border-bottom: 0; }

/* accordion */
.accordion { display: grid; gap: 10px; max-width: 800px; }
.accordion__item { background: var(--c-surface); border: 1px solid var(--c-border); border-radius: var(--radius-m); overflow: hidden; }
.accordion__btn {
  width: 100%; display: flex; align-items: center; justify-content: space-between; gap: 16px; text-align: left;
  padding: 16px 18px; min-height: 56px; background: transparent; border: 0; font-weight: 700; font-size: 16px;
  transition: background-color var(--dur) var(--ease);
}
.accordion__btn:hover { background: var(--c-surface-2); }
.accordion__btn:focus-visible { outline-offset: -3px; }
.accordion__btn svg { width: 22px; height: 22px; flex: none; transition: transform var(--dur) var(--ease); color: var(--c-accent); }
.accordion__btn[aria-expanded="true"] svg { transform: rotate(180deg); }
.accordion__panel { padding: 0 18px 18px; color: var(--c-fg-2); }
.accordion__panel[hidden] { display: none; }

/* ---------- Cases ---------- */
.case { display: grid; gap: 24px; padding: 28px 24px; background: var(--c-surface); border: 1px solid var(--c-border); border-radius: var(--radius-l); box-shadow: var(--shadow-1); }
.case + .case { margin-top: 24px; }
.case__head { display: grid; gap: 12px; }
.case__logo { width: 72px; height: 72px; border-radius: var(--radius-m); display: grid; place-items: center; background: var(--c-primary); color: var(--c-on-primary); font-family: var(--font-num); font-weight: 600; font-size: 22px; letter-spacing: .02em; }
.case__co { font-size: 22px; }
.case__meta { display: flex; flex-wrap: wrap; gap: 6px 14px; font-size: 14px; color: var(--c-fg-2); margin-top: 4px; }
.case__body { display: grid; gap: 20px; }
.case__block h4 { font-size: 14px; letter-spacing: .08em; color: var(--c-accent); margin-bottom: 8px; display: inline-flex; align-items: center; gap: 8px; }
.case__block h4::before { content: ""; width: 8px; height: 8px; background: currentColor; border-radius: 2px; }
.case__block p, .case__block li { color: var(--c-fg-2); }
.case__block ul { display: grid; gap: 6px; }
.case__block li { padding-left: 1.2em; position: relative; }
.case__block li::before { content: "・"; position: absolute; left: 0; color: var(--c-fg); }
.case__results { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
.case__result { padding: 14px 10px; background: var(--c-surface-2); border-radius: var(--radius-m); text-align: center; }
.case__result b { display: block; font-family: var(--font-num); font-size: 26px; font-weight: 600; color: var(--c-accent); line-height: 1.1; font-variant-numeric: tabular-nums; }
.case__result small { display: block; font-size: 13px; color: var(--c-fg-2); margin-top: 4px; line-height: 1.4; }
@media (max-width: 599px) {
  .case__results { grid-template-columns: 1fr; }
  .case__result { display: flex; align-items: baseline; gap: 12px; text-align: left; padding: 10px 14px; }
  .case__result b { font-size: 24px; min-width: 5.5em; }
  .case__result small { margin: 0; }
  .case__result small br { display: none; }
}
.case__quote { padding: 16px 18px; border-left: 4px solid var(--c-accent); background: var(--c-surface-2); border-radius: 0 var(--radius-m) var(--radius-m) 0; }
.case__quote p { font-style: normal; }
.case__quote cite { display: block; margin-top: 8px; font-style: normal; font-size: 13px; color: var(--c-fg-2); }
@media (min-width: 768px) {
  .case { grid-template-columns: 260px 1fr; padding: 32px; }
  .case__body { grid-template-columns: 1fr 1fr; }
  .case__body .case__results, .case__body .case__quote { grid-column: 1 / -1; }
}

/* chart */
.chart-card { background: var(--c-surface); border: 1px solid var(--c-border); border-radius: var(--radius-l); padding: 20px; box-shadow: var(--shadow-1); }
.chart-card__head { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px; align-items: flex-end; margin-bottom: 16px; }
.chart-card__head h3 { font-size: 18px; }
.chart-card__head p { font-size: 14px; color: var(--c-fg-2); }
.chart-legend { display: flex; flex-wrap: wrap; gap: 8px 18px; font-size: 14px; }
.chart-legend li { display: inline-flex; align-items: center; gap: 8px; }
.chart-legend .sw { width: 28px; height: 0; border-top: 3px solid var(--c-accent); }
.chart-legend .sw--dash { border-top-style: dashed; border-color: var(--c-fg-2); }
.chart-legend .sw--bar { width: 14px; height: 14px; border: 0; background: var(--c-primary); opacity: .35; border-radius: 2px; }
.chart { width: 100%; height: auto; overflow: visible; font-family: var(--font-num); }
.chart .axis { stroke: var(--c-border); }
.chart .grid { stroke: var(--c-grid); }
.chart .tick { font-size: 12px; fill: var(--c-fg-2); }
.chart .tick--x { text-anchor: middle; }
.chart .tick--y { text-anchor: end; }
.chart .bar { fill: var(--c-primary); opacity: .22; }
.chart .line { fill: none; stroke: var(--c-accent); stroke-width: 3; stroke-linejoin: round; stroke-linecap: round; }
.chart .line--target { stroke: var(--c-fg-2); stroke-width: 2; stroke-dasharray: 6 6; }
.chart .dot { fill: var(--c-surface); stroke: var(--c-accent); stroke-width: 3; }
.chart .vlabel { font-size: 12px; fill: var(--c-fg); text-anchor: middle; font-weight: 600; }
.chart .event { fill: var(--c-fg-2); font-size: 12px; }
.chart .event-line { stroke: var(--c-fg-2); stroke-dasharray: 3 3; }
.chart .pt { cursor: default; }
.chart .pt:focus { outline: none; }
.chart .pt:focus .dot, .chart .pt:hover .dot { stroke-width: 5; }
.chart .pt .tip { opacity: 0; transition: opacity var(--dur) var(--ease); pointer-events: none; }
.chart .pt:focus .tip, .chart .pt:hover .tip { opacity: 1; }
.chart .tip rect { fill: var(--c-fg); rx: 4; }
.chart .tip text { fill: var(--c-bg); font-size: 12px; text-anchor: middle; font-weight: 600; }
.chart-mobile-note { display: none; font-size: 13px; color: var(--c-fg-2); margin-top: 8px; }
.chart-scroll { position: relative; overflow-x: auto; -webkit-overflow-scrolling: touch; }
@media (max-width: 599px) {
  .chart { min-width: 560px; }
  .chart .tick, .chart .event, .chart .vlabel { font-size: 15px; }
  .chart .tip text { font-size: 15px; }
  .chart-mobile-note { display: block; }
}
.chart-table summary { cursor: pointer; font-weight: 700; margin-top: 16px; min-height: 44px; display: flex; align-items: center; color: var(--c-accent); }
.chart-table table { width: 100%; border-collapse: collapse; font-size: 14px; margin-top: 8px; }
.chart-table th, .chart-table td { padding: 8px 10px; border-bottom: 1px solid var(--c-border); text-align: right; font-variant-numeric: tabular-nums; }
.chart-table th:first-child, .chart-table td:first-child { text-align: left; }

/* ---------- Contact ---------- */
.contact-grid { display: grid; gap: 32px; }
.contact-aside { display: grid; gap: 16px; align-content: start; }
.contact-aside .card p { color: var(--c-fg-2); }
.contact-aside .card + .card { margin: 0; }
.contact-aside dl { display: grid; gap: 4px; margin: 0; }
.contact-aside dt { font-weight: 700; font-size: 14px; }
.contact-aside dd { margin: 0 0 8px; color: var(--c-fg-2); }
@media (min-width: 900px) { .contact-grid { grid-template-columns: 1.4fr 1fr; gap: 48px; } }

.form { background: var(--c-surface); border: 1px solid var(--c-border); border-radius: var(--radius-l); padding: 24px; box-shadow: var(--shadow-1); }
@media (min-width: 768px) { .form { padding: 36px; } }
.form__summary { display: none; margin-bottom: 20px; padding: 14px 16px; border: 1px solid var(--c-err); border-left-width: 4px; border-radius: var(--radius-m); color: var(--c-err); background: color-mix(in srgb, var(--c-err) 8%, var(--c-surface)); }
.form__summary.is-visible { display: block; }
.form__summary h2 { font-size: 16px; margin-bottom: 6px; }
.form__summary ul { display: grid; gap: 4px; }
.form__summary a { color: inherit; }
.form__grid { display: grid; gap: 20px; }
@media (min-width: 640px) { .form__grid { grid-template-columns: 1fr 1fr; } .form__grid .field--full { grid-column: 1 / -1; } }
.field { display: grid; gap: 6px; }
.field label, .field legend { font-weight: 700; font-size: 15px; }
.field .req { color: var(--c-err); font-size: 12px; margin-left: 6px; font-weight: 700; }
.field .opt { color: var(--c-fg-2); font-size: 12px; margin-left: 6px; }
.field .help { font-size: 14px; color: var(--c-fg-2); }
.field input, .field select, .field textarea {
  width: 100%; min-height: 48px; padding: 10px 14px; background: var(--c-bg); color: var(--c-fg);
  border: 1px solid var(--c-border); border-radius: var(--radius-m);
  transition: border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.field select { appearance: none; -webkit-appearance: none; padding-right: 40px;
  background-image: linear-gradient(45deg, transparent 50%, currentColor 50%), linear-gradient(135deg, currentColor 50%, transparent 50%);
  background-position: calc(100% - 20px) 50%, calc(100% - 14px) 50%; background-size: 6px 6px, 6px 6px; background-repeat: no-repeat; }
.field textarea { min-height: 140px; resize: vertical; }
.field input:focus, .field select:focus, .field textarea:focus { outline: 3px solid var(--c-ring); outline-offset: 2px; border-color: var(--c-ring); }
.field.is-invalid input, .field.is-invalid select, .field.is-invalid textarea { border-color: var(--c-err); border-width: 2px; }
.field__error { display: none; font-size: 14px; color: var(--c-err); font-weight: 700; align-items: flex-start; gap: 6px; }
.field__error svg { width: 18px; height: 18px; flex: none; margin-top: 2px; }
.field.is-invalid .field__error { display: flex; }
.check { display: flex; gap: 12px; align-items: flex-start; }
.check input { width: 22px; height: 22px; min-height: 0; margin: 2px 0 0; flex: none; accent-color: var(--c-accent); padding: 0; }
.check label { font-weight: 500; }
.check label a { color: var(--c-accent); }
.form__actions { margin-top: 28px; display: grid; gap: 10px; }
.form__actions .note { font-size: 14px; color: var(--c-fg-2); }
.form__done { display: none; text-align: center; padding: 24px 8px; }
.form__done.is-visible { display: block; }
.form__done .done-ic { width: 72px; height: 72px; margin: 0 auto 16px; border-radius: 50%; display: grid; place-items: center; background: color-mix(in srgb, var(--c-ok) 14%, var(--c-surface)); color: var(--c-ok); }
.form__done .done-ic svg { width: 40px; height: 40px; }
.form__done h2 { font-size: 24px; margin-bottom: 8px; }
.form__done p { color: var(--c-fg-2); }
.form__done .btn { margin-top: 20px; }

/* spinner */
.spinner { width: 20px; height: 20px; border: 3px solid currentColor; border-right-color: transparent; border-radius: 50%; animation: spin .8s linear infinite; display: none; }
.btn.is-loading .spinner { display: inline-block; }
@keyframes spin { to { transform: rotate(360deg); } }

/* reveal: 検証で IntersectionObserver の発火遅れにより空白になる事象を確認したため、
   初期非表示のスクロール出現は採用しない(常時表示)。 */
.reveal { opacity: 1; transform: none; }