/* BINAH コーポレートサイト。外部フォント・外部スクリプトなし（CSP: default-src 'self'）。
   色はアプリ（prototype/index.html）と同じトークン。 */
/* 書体：Klee One（SIL OFL 1.1、src/fonts/OFL-KleeOne.txt）。サイトの文字だけに絞って自社配信。tools/subset-fonts.py で作る。見本は management/brand-preview.html */
@font-face{font-family:"Klee One";font-weight:400;font-style:normal;font-display:swap;src:url(/fonts/klee-one-400.woff2) format("woff2")}
@font-face{font-family:"Klee One";font-weight:600;font-style:normal;font-display:swap;src:url(/fonts/klee-one-600.woff2) format("woff2")}

/* ブランド：墨紺（学びのインク）× 生成り（書物の紙）× 灯（ともしび）。brand/brand-guide.md */
:root{
  --bg:#f5f0e6; --surface:rgba(251,248,241,.55); --sunken:#ece5d6; --ink:#1b2340; --muted:#545a6b; --line:#ddd4c2;
  --primary:#1b2340; --on-primary:#f5f0e6; --primary-soft:#e4e2e6; --link:#2b3a6b;
  --gold:#c9973a; --gold-text:#7f5a12; --gold-soft:#f3e6c8; --olive:#3e5a4c;
  --shadow:0 1px 2px rgba(27,35,64,.05),0 8px 24px rgba(27,35,64,.06);
  --f-display:"Klee One","Noto Serif JP","Hiragino Mincho ProN","Yu Mincho","YuMincho","BIZ UDPMincho",serif;
  --f-body:"Klee One","BIZ UDPGothic","Hiragino Sans","Noto Sans JP","Yu Gothic","Meiryo",sans-serif;
  color-scheme:light;
}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]){
  --bg:#12151f; --surface:#1a1f2d; --sunken:#151a26; --ink:#ece6d8; --muted:#aaa697; --line:#2c3243;
  --primary:#ece6d8; --on-primary:#12151f; --primary-soft:#262c3c; --link:#e0c27e;
  --gold:#d8ae5a; --gold-text:#e0c27e; --gold-soft:#30291b; --olive:#8fb39f;
  --shadow:0 1px 2px rgba(0,0,0,.35); color-scheme:dark}}
:root[data-theme="dark"]{
  --bg:#12151f; --surface:#1a1f2d; --sunken:#151a26; --ink:#ece6d8; --muted:#aaa697; --line:#2c3243;
  --primary:#ece6d8; --on-primary:#12151f; --primary-soft:#262c3c; --link:#e0c27e;
  --gold:#d8ae5a; --gold-text:#e0c27e; --gold-soft:#30291b; --olive:#8fb39f;
  --shadow:0 1px 2px rgba(0,0,0,.35); color-scheme:dark}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--f-body);font-size:16px;line-height:1.8;overflow-wrap:anywhere}
img{max-width:100%;height:auto}
a{color:var(--link);text-underline-offset:3px}
h1,h2,h3{font-family:var(--f-display);font-weight:600;letter-spacing:.02em;line-height:1.45;text-wrap:balance;margin:0 0 .5em}
h1{font-size:clamp(1.7rem,4.6vw,2.6rem)}
h2{font-size:clamp(1.3rem,3vw,1.7rem)}
h3{font-size:1.1rem}
p{margin:0 0 1em}
.num{font-variant-numeric:tabular-nums}
:focus-visible{outline:3px solid var(--gold);outline-offset:2px;border-radius:4px}
.wrap{max-width:1040px;margin:0 auto;padding-inline:16px}
.narrow{max-width:760px}
.skip{position:absolute;left:-9999px}
.skip:focus{left:16px;top:8px;z-index:10;background:var(--surface);padding:8px 12px}

/* header / footer */
.site-header{background:var(--surface);border-bottom:1px solid var(--line)}
.header-in{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:8px 20px;padding-block:12px}
.logo{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink);font-family:var(--f-display);font-weight:600;font-size:1.2rem;letter-spacing:.22em}
.nav{display:flex;flex-wrap:wrap;gap:4px 18px;list-style:none;margin:0;padding:0;font-size:.95rem}
.nav a{color:var(--ink);text-decoration:none;padding:6px 0;display:inline-block}
.nav a:hover,.nav a[aria-current="page"]{color:var(--primary);text-decoration:underline;text-underline-offset:6px}
.site-footer{margin-top:72px;background:var(--surface);border-top:1px solid var(--line);font-size:.9rem;color:var(--muted)}
.footer-in{padding-block:32px}
.footer-promise{color:var(--ink);font-weight:700}
.footer-links{display:flex;flex-wrap:wrap;gap:6px 20px;list-style:none;margin:0 0 16px;padding:0}
.footer-links a{color:var(--muted)}
.copy{margin:0}

/* sections */
.hero{padding-block:64px 48px}
.eyebrow{color:var(--gold-text);font-weight:700;letter-spacing:.06em;font-size:.9rem;margin-bottom:.6em}
.lead{font-size:1.1rem;color:var(--muted);max-width:40em}
.section{padding-block:40px}
.section-title{margin-bottom:20px}
.grid{display:grid;gap:16px;grid-template-columns:repeat(auto-fit,minmax(min(100%,280px),1fr))}
.card{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:22px;box-shadow:var(--shadow)}
.card p:last-child{margin-bottom:0}
.card-link{display:block;text-decoration:none;color:inherit;transition:border-color .15s}
.card-link:hover{border-color:var(--primary)}
.tag{display:inline-block;font-size:.8rem;font-weight:700;padding:2px 10px;border-radius:999px;background:var(--primary-soft);color:var(--primary);margin-bottom:10px}
.tag-gold{background:var(--gold-soft);color:var(--gold-text)}
.muted{color:var(--muted)}
.small{font-size:.88rem}
.btn{display:inline-block;background:var(--primary);color:var(--on-primary);text-decoration:none;font-weight:700;padding:12px 22px;border-radius:10px;min-height:44px}
.btn:hover{filter:brightness(1.08)}
.btn-ghost{background:transparent;color:var(--primary);border:2px solid var(--primary)}
.actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:24px}
.promise{list-style:none;padding:0;margin:0;display:grid;gap:12px}
.promise li{padding-left:28px;position:relative}
.promise li::before{content:"";position:absolute;left:4px;top:.55em;width:12px;height:12px;border-radius:3px;background:var(--gold)}
.steps{counter-reset:s;list-style:none;padding:0;margin:0;display:grid;gap:14px}
.steps li{counter-increment:s;padding-left:44px;position:relative}
.steps li::before{content:counter(s);position:absolute;left:0;top:0;width:30px;height:30px;border-radius:50%;background:var(--primary);color:var(--on-primary);display:grid;place-items:center;font-weight:700;font-size:.9rem}
.note{background:var(--sunken);border-radius:12px;padding:16px 18px;font-size:.9rem;color:var(--muted)}
.todo{background:var(--gold-soft);border-left:4px solid var(--gold);padding:2px 8px;border-radius:4px;color:var(--ink)}

/* tables & prose */
.table{width:100%;border-collapse:collapse;background:var(--surface);border-radius:12px;overflow:hidden;font-size:.95rem}
.table th,.table td{text-align:left;vertical-align:top;padding:12px 14px;border-bottom:1px solid var(--line)}
.table th{width:30%;background:var(--sunken);font-weight:700}
.table-scroll{overflow-x:auto}
.prose h2{margin-top:1.8em}
.prose h3{margin-top:1.4em}
.prose ul,.prose ol{padding-left:1.4em}
.prose li{margin-bottom:.4em}
.breadcrumb{font-size:.85rem;color:var(--muted);padding-top:20px}
.breadcrumb a{color:var(--muted)}
.page-head{padding-block:28px 8px}

/* ブランドのモチーフ：「あいだ」。2本の柱と、その間の灯 */
.hero{position:relative}
.meaning{border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding-block:40px}
.meaning-word{font-family:var(--f-display);font-size:clamp(2rem,6vw,3.2rem);letter-spacing:.3em;margin:0 0 4px}
.meaning-sub{color:var(--gold-text);font-weight:700;letter-spacing:.1em;margin-bottom:20px}
.quote{font-family:var(--f-display);font-size:1.15rem;line-height:1.9;border-left:3px solid var(--gold);padding-left:18px;margin:0 0 6px}
.quote-src{font-size:.85rem;color:var(--muted);padding-left:21px;margin-bottom:24px}
.pair{display:grid;grid-template-columns:1fr 1fr;gap:12px;align-items:stretch}
.pair .card{margin:0}
@media (max-width:640px){.pair{grid-template-columns:1fr}}
.btn{border-radius:6px;letter-spacing:.04em}
.card{border-radius:10px}

/* ロゴ（枠なしA案）：ヘッダーは横組みのロックアップ、狭い画面では ב＋灯のマークだけ */
.logo-lockup{display:block;width:152px;height:auto;margin-block:-14px}
@media (max-width:480px){.logo-lockup{width:132px;margin-block:-12px}}

/* トップの問い：ロゴが ב に決まったので、飾りの代わりに問いを大きく見せる */
.question{font-size:clamp(1.7rem,5vw,2.6rem);margin-bottom:28px}
.pair + .small{margin-top:14px}

/* 監修の表記（FP-6）：社長が最終確認したページの末尾だけに出す */
.reviewed{border-top:1px solid var(--line);margin-top:2em;padding-top:12px;font-size:.9rem;color:var(--muted)}
.reviewed span{display:block;margin-top:4px;font-size:.85rem}

/* 紙の質感：細かい繊維ノイズ（SVG、画像ファイルなし）を背景に重ねる。文字より後ろ、操作を邪魔しない。ダークでは外す（見本どおり） */
body{position:relative;text-shadow:0 0 .5px currentColor,.2px .3px .6px rgba(27,35,64,.2);-webkit-font-smoothing:antialiased}
body::before{content:"";position:fixed;inset:0;z-index:-1;pointer-events:none;opacity:.45;background-image:url(/assets/paper.svg)}
body::after{content:"";position:fixed;inset:0;z-index:-1;pointer-events:none;background:radial-gradient(ellipse at 50% 30%,rgba(255,255,255,.35),rgba(120,95,50,.08) 100%)}
.card,.table,.site-header,.site-footer{text-shadow:inherit}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]) body{text-shadow:none}:root:not([data-theme="light"]) body::before,:root:not([data-theme="light"]) body::after{display:none}}
:root[data-theme="dark"] body{text-shadow:none}
:root[data-theme="dark"] body::before,:root[data-theme="dark"] body::after{display:none}
@media (prefers-reduced-transparency: reduce){body::before{display:none}}
.grid + p{margin-top:18px}

/* ===== v3：トップ（考える葦）。動きはCSSだけ。葦は線画のSVG ===== */
.site-header .logo-dark{display:none}
.home .site-header{position:absolute;inset:0 0 auto 0;z-index:3;background:transparent;border:0;color:#f5f0e6}
.home .site-header .logo-light{display:none}
.home .site-header .logo-dark{display:block}
.home .nav a{color:#f5f0e6}
.home .nav a:hover{color:#f5f0e6}
.home .header-in,.first-in{max-width:1200px}
.home .header-in{padding-block:36px}
.home .skip:focus{color:#1b2340}
.first{position:relative;min-height:100vh;min-height:100svh;background:#1b2340;color:#f5f0e6;overflow:hidden;display:flex;flex-direction:column;justify-content:center;text-shadow:none}
.first::before{content:"";position:absolute;inset:0;background-image:url(/assets/paper.svg);background-size:300px 300px;opacity:.07;pointer-events:none}
.first-in{position:relative;z-index:1;width:100%;margin:0 auto;padding:140px 24px 120px}
.first h1{font-size:clamp(3rem,9.5vw,6.5rem);line-height:1.36;letter-spacing:.05em;margin:0 0 .5em;white-space:nowrap}
.first .quote-box{max-width:38em}
.first .q span{display:block;text-wrap:balance}
.first .q{margin:0;font-size:clamp(1rem,1.6vw,1.3rem);line-height:2;letter-spacing:.08em;color:rgba(245,240,230,.88)}
.first .q-src{margin:12px 0 0;font-size:.8rem;letter-spacing:.12em;color:rgba(245,240,230,.7)}
.reed{position:absolute;z-index:0;right:max(4vw,16px);bottom:-34px;width:clamp(180px,24vw,320px);height:auto;overflow:visible;opacity:.62}
.reed path{vector-effect:non-scaling-stroke}
.reed .draw{stroke-dasharray:1;stroke-dashoffset:1;animation:reed-draw 2.6s cubic-bezier(.4,0,.2,1) forwards}
.reed .leaf{stroke-dasharray:1;stroke-dashoffset:1;animation:reed-draw 1.8s cubic-bezier(.4,0,.2,1) forwards}
.reed .l1{animation-delay:1s}.reed .l2{animation-delay:1.3s}.reed .l3{animation-delay:1.6s}.reed .l4{animation-delay:1.9s}.reed .l5{animation-delay:2.1s}
.reed .pl{opacity:0;animation:reed-fade 1.2s ease-out 2.4s forwards}
.reed .lamp{opacity:0;animation:reed-lamp 1.4s ease-out 3.2s forwards}
.rise{opacity:0;transform:translateY(10px);animation:reed-rise 1.4s ease-out forwards}
.rise.c{animation-delay:.8s}.rise.d{animation-delay:1.6s}
.first-foot{position:absolute;z-index:1;left:0;right:0;bottom:36px;font-size:.85rem;letter-spacing:.12em;color:rgba(245,240,230,.75)}
.first-foot .first-in{padding:0 24px;display:flex;flex-wrap:wrap;gap:6px 36px}
.cue{position:absolute;z-index:1;right:max(4vw,16px);bottom:36px;width:1px;height:56px;background:rgba(245,240,230,.6);transform-origin:top;transform:scaleY(0);animation:reed-cue 1.6s ease-out 2.4s forwards}
@keyframes reed-draw{to{stroke-dashoffset:0}}
@keyframes reed-fade{to{opacity:.7}}
@keyframes reed-lamp{to{opacity:1}}
@keyframes reed-rise{to{opacity:1;transform:none}}
@keyframes reed-cue{to{transform:scaleY(1)}}
@media (prefers-reduced-motion:reduce){.reed .draw,.reed .leaf,.reed .pl,.reed .lamp,.rise,.cue{animation:none!important;opacity:1;stroke-dashoffset:0;transform:none}.reed .pl{opacity:.7}}
@media (max-width:640px){.first-in{padding:120px 24px 150px}.first h1{font-size:3rem}.reed{opacity:.45;width:170px;bottom:-90px}.cue{display:none}.first-foot{flex-direction:column}}
.biz-intro{font-family:var(--f-display);font-size:clamp(1.3rem,3vw,1.7rem);margin:0 0 24px}
.biz-list{list-style:none;margin:0;padding:0;border-top:1px solid var(--line)}
.biz-list li{padding:18px 0;border-bottom:1px solid var(--line);font-family:var(--f-display);font-size:1.15rem;letter-spacing:.08em}
.etym{margin-top:40px;color:var(--muted);font-size:.95rem}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]) .site-header .logo-light{display:none}:root:not([data-theme="light"]) .site-header .logo-dark{display:block}}