/* =====================================================================
   アルスパートナーズ / 環境ソリューションプロデュース
   単一CSS — 変数でトークン管理。ビルド工程なし。
   ===================================================================== */

/* ---- Design tokens — ブランドカラー：オレンジ（現行ロゴ #ff6b3e 由来） ---- */
:root {
  --color-primary:   #C24E14;  /* バーントオレンジ：見出し・主ボタン（白文字コントラスト確保） */
  --color-primary-d: #8F3809;  /* 濃：フッター背景・ホバー */
  --color-accent:    #FF6B3E;  /* ブランドオレンジ：アクセント・番号・線（= ロゴ色） */
  --color-brand:     #FF6B3E;  /* ロゴ原色 */
  --color-ink:       #241C18;  /* 本文（温かい黒） */
  --color-muted:     #6E625B;  /* 補足テキスト */
  --color-bg:        #FBF8F5;  /* ベース背景（温白） */
  --color-bg-alt:    #F6EEE7;  /* セクション交互背景 */
  --color-line:      #EBE0D7;

  --font-sans: "Zen Kaku Gothic New", "Noto Sans JP", sans-serif;
  --font-serif: "Shippori Mincho", serif;

  --header-h: 72px;
  --radius: 6px;
  --shadow-sm: 0 1px 2px rgba(60, 30, 10, .06);
  --shadow-md: 0 6px 24px rgba(60, 30, 10, .10);
  --maxw: 1120px;
  --gutter: clamp(20px, 5vw, 48px);
  --section-y: clamp(64px, 10vw, 120px);
}

/* ---- Reset / base -------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--header-h) + 8px); -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font-sans);
  font-weight: 400;
  color: var(--color-ink);
  background: var(--color-bg);
  line-height: 1.85;
  font-feature-settings: "palt";
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
ul { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, h4, p { margin: 0; }
:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 3px; }

/* ---- Layout helpers ------------------------------------------------ */
.container { width: 100%; max-width: var(--maxw); margin-inline: auto; padding-inline: var(--gutter); }
.section { padding-block: var(--section-y); }
.section--alt { background: var(--color-bg-alt); }
.section__head { max-width: 760px; margin-bottom: clamp(32px, 5vw, 56px); }
.eyebrow {
  font-size: .8rem; font-weight: 700; letter-spacing: .14em;
  color: var(--color-accent); text-transform: uppercase; margin-bottom: 14px;
  display: inline-flex; align-items: center; gap: 10px;
}
.eyebrow::before { content: ""; width: 28px; height: 1px; background: var(--color-accent); }

/* ---- Typography ---------------------------------------------------- */
.h-serif { font-family: var(--font-serif); font-weight: 600; line-height: 1.4; letter-spacing: .01em; }
h2.section__title {
  font-family: var(--font-serif); font-weight: 600;
  font-size: clamp(1.5rem, 3.4vw, 2.15rem); line-height: 1.45; color: var(--color-primary);
}
h3 { font-size: 1.12rem; font-weight: 700; line-height: 1.6; color: var(--color-ink); }
.lead { font-size: clamp(1rem, 1.6vw, 1.12rem); color: var(--color-ink); }
.muted { color: var(--color-muted); }
.section__lead { margin-top: 18px; color: var(--color-muted); font-size: 1.02rem; }

/* ---- Buttons ------------------------------------------------------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  padding: 14px 28px; border-radius: var(--radius); font-weight: 700; font-size: .98rem;
  border: 1px solid transparent; cursor: pointer; transition: background .2s, color .2s, border-color .2s, transform .05s;
  line-height: 1.3;
}
.btn:active { transform: translateY(1px); }
.btn--primary { background: var(--color-primary); color: #fff; }
.btn--primary:hover { background: var(--color-primary-d); }
.btn--ghost { background: transparent; color: var(--color-primary); border-color: var(--color-line); }
.btn--ghost:hover { border-color: var(--color-primary); }
.btn--on-dark { background: #fff; color: var(--color-primary-d); }
.btn--on-dark:hover { background: var(--color-bg-alt); }
.btn--ghost-on-dark { background: transparent; color: #fff; border-color: rgba(255,255,255,.5); }
.btn--ghost-on-dark:hover { border-color: #fff; background: rgba(255,255,255,.08); }
.btn__arrow { transition: transform .2s; }
.btn:hover .btn__arrow { transform: translateX(3px); }

/* ---- Header -------------------------------------------------------- */
.site-header {
  position: fixed; inset: 0 0 auto 0; height: var(--header-h); z-index: 100;
  background: rgba(251, 248, 245, .88); backdrop-filter: saturate(1.4) blur(10px);
  border-bottom: 1px solid var(--color-line);
}
.site-header__inner { height: 100%; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: inline-flex; align-items: center; gap: 12px; }
.brand__logo { height: 32px; width: auto; display: block; }
.brand__name { font-family: var(--font-serif); font-weight: 600; font-size: 1.02rem; color: var(--color-primary-d); letter-spacing: .02em; }
.footer__logo { height: 36px; width: auto; margin-bottom: 16px; }
.nav { display: flex; align-items: center; gap: clamp(14px, 2vw, 30px); }
.nav__list { display: flex; align-items: center; gap: clamp(14px, 2vw, 28px); }
.nav__link { font-size: .95rem; font-weight: 500; color: var(--color-ink); padding: 6px 0; position: relative; }
.nav__link::after {
  content: ""; position: absolute; left: 0; bottom: -2px; width: 0; height: 2px;
  background: var(--color-accent); transition: width .2s;
}
.nav__link:hover::after, .nav__link[aria-current="page"]::after { width: 100%; }
.nav__link[aria-current="page"] { color: var(--color-primary); }
.nav__cta { padding: 10px 20px; font-size: .92rem; }
.nav-toggle { display: none; }

/* ---- Hero （メインビジュアル：動的背景） --------------------------- */
.hero {
  position: relative; margin-top: var(--header-h); color: #fff; isolation: isolate; overflow: hidden;
  min-height: clamp(560px, 90vh, 880px); display: flex; align-items: center;
  /* 温かい近黒＋オレンジの深いベース */
  background:
    radial-gradient(120% 90% at 80% 10%, rgba(255,107,62,.30), transparent 55%),
    radial-gradient(90% 80% at 15% 100%, rgba(194,78,20,.34), transparent 60%),
    linear-gradient(155deg, #1a0f08 0%, #2a160c 45%, #3a1c0c 100%);
}
/* 動画スロット（クライアントの実写映像を差し込む。src が空なら非表示） */
.hero__video { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; z-index: -3; opacity: .5; }
/* パーティクル・ネットワーク（“座組＝つなぐ”を表現、JSで描画） */
.hero__canvas { position: absolute; inset: 0; width: 100%; height: 100%; z-index: -2; }
/* ゆっくり漂うオレンジのグロー */
.hero::before {
  content: ""; position: absolute; z-index: -2; width: 60vw; height: 60vw; max-width: 720px; max-height: 720px;
  top: -12%; right: -8%; border-radius: 50%; pointer-events: none;
  background: radial-gradient(circle, rgba(255,107,62,.28), transparent 68%);
  filter: blur(10px); animation: heroGlow 14s ease-in-out infinite alternate;
}
/* 可読性オーバーレイ＋下部ヴィネット */
.hero::after {
  content: ""; position: absolute; inset: 0; z-index: -1; pointer-events: none;
  background:
    linear-gradient(100deg, rgba(20,12,7,.86) 0%, rgba(26,15,8,.60) 48%, rgba(26,15,8,.18) 100%),
    linear-gradient(0deg, rgba(16,9,5,.75) 0%, transparent 34%);
}
@keyframes heroGlow { from { transform: translate(0,0) scale(1); } to { transform: translate(-4%, 5%) scale(1.12); } }
.hero__inner { padding-block: clamp(64px, 12vw, 120px); max-width: 820px; position: relative; }
.hero__kicker {
  display: inline-flex; align-items: center; gap: 12px; margin-bottom: 26px;
  font-size: .8rem; font-weight: 700; letter-spacing: .18em; color: #ffd9c8; text-transform: uppercase;
}
.hero__kicker::before { content: ""; width: 34px; height: 2px; background: var(--color-brand); }
.hero__title { font-size: clamp(2.1rem, 6.2vw, 4rem); line-height: 1.3; letter-spacing: .015em; text-shadow: 0 2px 30px rgba(0,0,0,.35); }
.hero__title .accent { color: var(--color-brand); }
.hero__sub { margin-top: 28px; font-size: clamp(1rem, 1.8vw, 1.18rem); line-height: 1.95; color: rgba(255,255,255,.9); max-width: 40em; }
.hero__actions { margin-top: 42px; display: flex; flex-wrap: wrap; gap: 16px; }
/* スクロール誘導 */
.hero__scroll { position: absolute; left: 50%; bottom: 26px; transform: translateX(-50%); z-index: 1; color: rgba(255,255,255,.7); font-size: .72rem; letter-spacing: .16em; text-align: center; }
.hero__scroll span { display: block; width: 1px; height: 40px; margin: 8px auto 0; background: linear-gradient(rgba(255,255,255,.7), transparent); animation: scrollCue 1.8s ease-in-out infinite; transform-origin: top; }
@keyframes scrollCue { 0%,100% { transform: scaleY(.4); opacity:.4; } 50% { transform: scaleY(1); opacity:1; } }

/* ---- Cards grid ---------------------------------------------------- */
.grid { display: grid; gap: clamp(20px, 3vw, 32px); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--2 { grid-template-columns: repeat(2, 1fr); }

/* 課題カード（トップ・環境で共用） */
.issue-card {
  display: flex; flex-direction: column; background: #fff; border: 1px solid var(--color-line);
  border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow-sm);
  transition: box-shadow .2s, transform .2s, border-color .2s;
}
a.issue-card:hover { box-shadow: var(--shadow-md); transform: translateY(-3px); border-color: var(--color-primary); }
.issue-card__media { aspect-ratio: 16 / 10; background: var(--color-bg-alt); }
.issue-card__media img, .issue-card__media svg { width: 100%; height: 100%; object-fit: cover; }
.issue-card__body { padding: 24px 24px 28px; display: flex; flex-direction: column; gap: 10px; flex: 1; }
/* タイトル・説明は2行分の高さを確保し、カード間で「くわしく見る」までの余白を揃える */
.issue-card__title { font-size: 1.1rem; font-weight: 700; color: var(--color-primary); line-height: 1.55; min-height: calc(1.1rem * 1.55 * 2); }
.issue-card__desc { font-size: .96rem; color: var(--color-muted); line-height: 1.8; min-height: calc(.96rem * 1.8 * 2); }
.issue-card__more { margin-top: auto; padding-top: 6px; font-weight: 700; font-size: .9rem; color: var(--color-primary); display: inline-flex; gap: 6px; }

/* ---- 3ステップ ----------------------------------------------------- */
.steps { display: grid; gap: clamp(20px, 3vw, 28px); grid-template-columns: repeat(3, 1fr); counter-reset: step; }
.step { background: #fff; border: 1px solid var(--color-line); border-radius: var(--radius); padding: 30px 26px; position: relative; }
.step__num { font-family: var(--font-serif); font-weight: 600; font-size: 2.2rem; color: var(--color-accent); line-height: 1; letter-spacing: .02em; }
.step__num small { font-size: .95rem; }
.step__title { margin-top: 14px; font-size: 1.06rem; font-weight: 700; color: var(--color-primary); }
.step__desc { margin-top: 10px; font-size: .96rem; color: var(--color-muted); }

/* ---- Generic content list ------------------------------------------ */
.card {
  background: #fff; border: 1px solid var(--color-line); border-radius: var(--radius);
  padding: clamp(24px, 3vw, 34px); box-shadow: var(--shadow-sm); height: 100%;
}
.card__title { font-size: 1.12rem; font-weight: 700; color: var(--color-primary); }
.card__title .num { color: var(--color-accent); font-family: var(--font-serif); margin-right: 10px; }
.card__desc { margin-top: 12px; color: var(--color-muted); font-size: .98rem; }
.card__label { font-size: .78rem; font-weight: 700; letter-spacing: .08em; color: var(--color-accent); text-transform: uppercase; }

/* 統一フォーマット（環境ページ 課題/アプローチ/対象例） */
.solution { border-top: 3px solid var(--color-primary); background: #fff; border-radius: var(--radius); box-shadow: var(--shadow-sm); overflow: hidden; }
.solution__media { aspect-ratio: 21 / 6; background: var(--color-bg-alt); }
.solution__media img { width: 100%; height: 100%; object-fit: cover; }
.solution__head { padding: 30px clamp(24px,3vw,40px) 8px; }
.solution__no { font-family: var(--font-serif); color: var(--color-accent); font-size: 1.1rem; font-weight: 600; }
.solution__title { font-family: var(--font-serif); font-weight: 600; font-size: clamp(1.25rem,2.4vw,1.6rem); color: var(--color-primary); margin-top: 4px; line-height: 1.45; }
.solution__grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--color-line); margin-top: 24px; }
.solution__cell { background: #fff; padding: 26px clamp(24px,3vw,40px); }
.solution__cell h4 { font-size: .82rem; font-weight: 700; letter-spacing: .06em; color: var(--color-accent); margin-bottom: 12px; }
.solution__cell p, .solution__cell li { font-size: .96rem; color: var(--color-ink); }
.solution__cell ul li { position: relative; padding-left: 18px; margin-bottom: 8px; color: var(--color-muted); }
.solution__cell ul li::before { content: ""; position: absolute; left: 0; top: .7em; width: 7px; height: 7px; border-radius: 50%; background: var(--color-accent); }
/* 取り扱う技術・サービスのタグ */
.sol-tags { padding: 22px clamp(24px,3vw,40px) 30px; border-top: 1px solid var(--color-line); }
.sol-tags__label { font-size: .82rem; font-weight: 700; letter-spacing: .06em; color: var(--color-accent); margin-bottom: 14px; }
.tags { display: flex; flex-wrap: wrap; gap: 10px; }
.tag { display: inline-flex; align-items: center; font-size: .9rem; font-weight: 500; color: var(--color-ink);
  background: var(--color-bg-alt); border: 1px solid var(--color-line); border-radius: 999px; padding: 8px 16px; }
.tag--hold { border-style: dashed; color: var(--color-muted); }

/* ---- Team ---------------------------------------------------------- */
.team-card { text-align: center; display: flex; flex-direction: column; }
.team-card__photo {
  width: 132px; height: 132px; border-radius: 50%; object-fit: cover; object-position: center 22%;
  margin: 0 auto 18px;
  background: var(--color-bg-alt); border: 3px solid #fff; box-shadow: var(--shadow-sm);
}
.team-card__name { font-size: 1.1rem; font-weight: 700; color: var(--color-ink); }
.team-card__name-en { font-size: .78rem; font-weight: 500; color: var(--color-muted); letter-spacing: .06em; margin-top: 3px; }
.team-card__role { font-size: .9rem; font-weight: 700; color: var(--color-primary); margin-top: 8px; }
.team-card__bio { font-size: .9rem; line-height: 1.85; color: var(--color-muted); margin-top: 14px; text-align: left; }
.grid--4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 1024px) { .grid--4 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 768px)  { .grid--4 { grid-template-columns: 1fr; } }
.team-placeholder {
  border: 1px dashed var(--color-line); border-radius: var(--radius); padding: 40px 24px;
  text-align: center; color: var(--color-muted); background: var(--color-bg-alt); font-size: .95rem;
}

/* ---- Band（写真を背景に敷く全幅セクション） ------------------------ */
.band { position: relative; color: #fff; isolation: isolate; overflow: hidden; }
.band::before {
  content: ""; position: absolute; inset: 0; z-index: -2;
  background-image: var(--band-img); background-size: cover; background-position: center;
  transform: scale(1.02);
}
.band::after {
  content: ""; position: absolute; inset: 0; z-index: -1;
  background:
    linear-gradient(100deg, rgba(18,11,6,.94) 0%, rgba(26,15,8,.80) 48%, rgba(26,15,8,.42) 100%),
    linear-gradient(0deg, rgba(16,9,5,.5) 0%, transparent 40%);
}
.band__inner { max-width: 720px; position: relative; }
.band__title { font-family: var(--font-serif); font-weight: 600; color: #fff; font-size: clamp(1.5rem, 3.4vw, 2.15rem); line-height: 1.45; }
.band__lead { margin-top: 20px; color: rgba(255,255,255,.9); font-size: 1.02rem; line-height: 1.95; }
@media (max-width: 768px) { .band__title { font-size: clamp(1.35rem, 5.6vw, 1.7rem); } .band__lead { font-size: .96rem; } }

/* ---- Callout / cross-sell ------------------------------------------ */
.callout {
  background: #fff; border: 1px solid var(--color-line); border-left: 4px solid var(--color-accent);
  border-radius: var(--radius); padding: clamp(24px,3vw,32px);
}
.callout__title { font-weight: 700; color: var(--color-primary); font-size: 1.05rem; }
.callout__body { margin-top: 10px; color: var(--color-muted); font-size: .98rem; }
.note { font-size: .9rem; color: var(--color-muted); background: var(--color-bg-alt); border-radius: var(--radius); padding: 16px 20px; }

/* ---- Info table ---------------------------------------------------- */
.info-table { width: 100%; border-collapse: collapse; background: #fff; border: 1px solid var(--color-line); border-radius: var(--radius); overflow: hidden; }
.info-table th, .info-table td { text-align: left; padding: 18px 22px; vertical-align: top; border-bottom: 1px solid var(--color-line); font-size: .97rem; }
.info-table tr:last-child th, .info-table tr:last-child td { border-bottom: 0; }
.info-table th { width: 30%; background: var(--color-bg-alt); color: var(--color-primary); font-weight: 700; white-space: nowrap; }

/* ---- CTA block (下層共通) ------------------------------------------ */
.cta { background: var(--color-primary); color: #fff; }
.cta__inner { text-align: center; max-width: 720px; margin-inline: auto; }
.cta__title { font-family: var(--font-serif); font-weight: 600; font-size: clamp(1.4rem, 3vw, 2rem); line-height: 1.5; }
.cta__body { margin-top: 16px; color: rgba(255,255,255,.9); font-size: 1.02rem; }
.cta__actions { margin-top: 30px; display: flex; justify-content: center; flex-wrap: wrap; gap: 16px; }

/* ---- CEO message --------------------------------------------------- */
.ceo { display: grid; grid-template-columns: 200px 1fr; gap: clamp(28px,4vw,48px); align-items: start; }
.ceo__photo { width: 100%; border-radius: var(--radius); background: var(--color-bg-alt); aspect-ratio: 3/4; object-fit: cover; }
.ceo__body p { font-size: 1.05rem; line-height: 2.05; }
.ceo__sign { margin-top: 22px; color: var(--color-muted); font-size: .95rem; }

/* ---- Form ---------------------------------------------------------- */
.form { display: grid; gap: 22px; max-width: 640px; }
.field { display: grid; gap: 8px; }
.field label { font-weight: 700; font-size: .95rem; }
.field .req { color: var(--color-accent); font-size: .8rem; margin-left: 6px; }
.field input, .field select, .field textarea {
  font-family: inherit; font-size: 1rem; color: var(--color-ink); background: #fff;
  border: 1px solid var(--color-line); border-radius: var(--radius); padding: 13px 15px; width: 100%;
}
.field input:focus, .field select:focus, .field textarea:focus { outline: 2px solid var(--color-primary); outline-offset: 0; border-color: var(--color-primary); }
.field textarea { min-height: 160px; resize: vertical; }
.form__note { font-size: .88rem; color: var(--color-muted); }

/* ---- Footer -------------------------------------------------------- */
.site-footer { background: var(--color-primary-d); color: rgba(255,255,255,.82); padding-block: clamp(48px, 7vw, 72px) 28px; font-size: .93rem; }
.site-footer a { color: rgba(255,255,255,.82); }
.site-footer a:hover { color: #fff; }
.footer__top { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: clamp(28px,4vw,48px); }
.footer__brand-name { font-family: var(--font-serif); font-weight: 600; font-size: 1.15rem; color: #fff; margin-bottom: 14px; }
.footer__nap p { margin-bottom: 6px; line-height: 1.7; }
.footer__col h4 { font-size: .82rem; letter-spacing: .1em; text-transform: uppercase; color: var(--color-accent); margin-bottom: 16px; }
.footer__col li { margin-bottom: 10px; }
.footer__license { margin-top: 12px; font-size: .85rem; color: rgba(255,255,255,.6); }
.footer__bottom { margin-top: clamp(32px,5vw,52px); padding-top: 22px; border-top: 1px solid rgba(255,255,255,.14); display: flex; flex-wrap: wrap; gap: 12px; justify-content: space-between; font-size: .82rem; color: rgba(255,255,255,.6); }

/* ---- Page hero (下層ページ共通の小ヒーロー) ------------------------ */
.page-hero { margin-top: var(--header-h); color: #fff; padding-block: clamp(52px, 8vw, 88px); position: relative; overflow: hidden;
  background:
    radial-gradient(90% 120% at 90% 0%, rgba(255,107,62,.28), transparent 55%),
    linear-gradient(150deg, #1a0f08 0%, #2a160c 60%, #3a1c0c 100%); }
.page-hero::after { content:""; position:absolute; right:-60px; top:-60px; width:280px; height:280px; border-radius:50%; background: radial-gradient(circle, rgba(255,107,62,.30), transparent 70%); }
.page-hero__inner { position: relative; max-width: 780px; }
.page-hero__title { font-family: var(--font-serif); font-weight: 600; font-size: clamp(1.7rem, 4vw, 2.6rem); line-height: 1.4; }
.page-hero__lead { margin-top: 20px; font-size: clamp(1rem, 1.6vw, 1.12rem); line-height: 1.9; color: rgba(255,255,255,.9); }

/* ---- Breadcrumb ---------------------------------------------------- */
.breadcrumb { font-size: .82rem; color: var(--color-muted); padding-block: 16px; }
.breadcrumb a:hover { color: var(--color-primary); }
.breadcrumb span { margin: 0 8px; color: var(--color-line); }

/* ---- Anchor offset utility ----------------------------------------- */
.anchor { scroll-margin-top: calc(var(--header-h) + 24px); }

/* ---- Responsive ---------------------------------------------------- */
@media (max-width: 1024px) {
  .footer__top { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
  :root { --header-h: 64px; --section-y: clamp(52px, 12vw, 72px); }
  .grid--3, .grid--2, .steps { grid-template-columns: 1fr; }
  .solution__grid { grid-template-columns: 1fr; }
  .ceo { grid-template-columns: 1fr; }
  .ceo__photo { max-width: 200px; aspect-ratio: 3/4; }
  .footer__top { grid-template-columns: 1fr; }

  /* --- モバイルのバランス調整 --- */
  .brand__logo { height: 26px; }
  .hero { min-height: auto; }
  .hero__inner { padding-block: 72px 84px; }
  .hero__title { font-size: clamp(1.6rem, 7.5vw, 2.4rem); line-height: 1.42; }
  .hero__sub { margin-top: 20px; font-size: .96rem; line-height: 1.85; }
  .hero__kicker { margin-bottom: 18px; font-size: .68rem; letter-spacing: .12em; }
  .hero__actions { margin-top: 30px; gap: 12px; }
  .hero__actions .btn { width: 100%; }
  .hero__scroll { display: none; }
  .page-hero__title { font-size: clamp(1.5rem, 7vw, 2rem); }
  .page-hero__lead { font-size: .96rem; }
  h2.section__title { font-size: clamp(1.35rem, 5.6vw, 1.7rem); }
  .section__head { margin-bottom: 28px; }
  .cta__title { font-size: clamp(1.25rem, 5.6vw, 1.6rem); }
  /* カードは1列になるので行数固定を解除し、余白を詰める */
  .issue-card__title, .issue-card__desc { min-height: 0; }
  .issue-card__body { padding: 20px 20px 22px; }
  .sol-tags, .solution__cell { padding-inline: 20px; }
  .info-table th, .info-table td { padding: 14px 16px; font-size: .92rem; }
  .info-table th { width: 34%; }
  .team-card__photo { width: 112px; height: 112px; }

  /* mobile nav */
  .nav {
    position: fixed; inset: var(--header-h) 0 auto 0; background: var(--color-bg);
    border-bottom: 1px solid var(--color-line); flex-direction: column; align-items: stretch;
    padding: 8px 0 20px; gap: 0; box-shadow: var(--shadow-md);
    transform: translateY(-8px); opacity: 0; visibility: hidden; transition: opacity .2s, transform .2s, visibility .2s;
  }
  .nav[data-open="true"] { transform: none; opacity: 1; visibility: visible; }
  .nav__list { flex-direction: column; align-items: stretch; gap: 0; width: 100%; }
  .nav__link { padding: 15px var(--gutter); border-bottom: 1px solid var(--color-line); }
  .nav__link::after { display: none; }
  .nav__cta { margin: 16px var(--gutter) 0; }
  .nav-toggle {
    display: inline-flex; flex-direction: column; justify-content: center; gap: 5px;
    width: 44px; height: 44px; background: transparent; border: 0; cursor: pointer; padding: 10px;
  }
  .nav-toggle span { display: block; height: 2px; width: 100%; background: var(--color-primary-d); transition: transform .2s, opacity .2s; }
  .nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
  .nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
}

@media (prefers-reduced-motion: reduce) {
  * { scroll-behavior: auto !important; transition: none !important; animation: none !important; }
  .hero__scroll span, .hero::before { animation: none !important; }
}