:root{
  --void:#040506;      /* 入口の地（concept3e のまま） */
  --ink:#0B0B0C;       /* DESIGN.md §2 墨 */
  --ink2:#121214;
  --paper:#F2F0EA;     /* DESIGN.md §2 印画紙 */
  --muted:#a6aaa9;
  --line:rgba(242,240,234,.12);
  --accent:#f2c230;    /* 差し色のみ（入口と同じ黄） */
  --err:#e0665a;
  --mono:"IBM Plex Mono",ui-monospace,monospace;
  --serif:"Shippori Mincho",serif;
  --sans:"Hiragino Kaku Gothic ProN","Noto Sans JP",sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;background:var(--ink);color:var(--paper);font:400 15px/1.9 var(--sans)}
a{color:inherit}
:focus-visible{outline:1px solid var(--accent);outline-offset:3px}

/* ── 入口 ── */
.hero{position:relative;height:100vh;height:100svh;min-height:520px;overflow:hidden;background:var(--void) url(/kv/kv3_photo.jpg) center/cover no-repeat;color:#e9e9e6}
.hero canvas{position:absolute;inset:0;width:100%;height:100%;display:block;cursor:crosshair;touch-action:pan-y}
.hero-logo-fallback{position:absolute;left:50%;top:42%;transform:translate(-50%,-50%);width:min(36vw,520px);height:auto}
.js .hero-logo-fallback{display:none}
.ui{position:absolute;inset:0;pointer-events:none;padding:max(20px,env(safe-area-inset-top)) max(24px,env(safe-area-inset-right)) max(20px,env(safe-area-inset-bottom)) max(24px,env(safe-area-inset-left));display:flex;flex-direction:column;justify-content:space-between}
.ui a{pointer-events:auto;color:inherit;text-decoration:none}
.top,.eyebrow,.sub,.prod,.hint{text-shadow:0 1px 3px rgba(0,0,0,.9),0 0 18px rgba(0,0,0,.7)}
.top{display:flex;justify-content:space-between;gap:16px;font:400 11px/1.6 var(--mono);letter-spacing:.14em}
.top .brand span{opacity:.6}
.top nav{display:flex;flex-wrap:wrap;justify-content:flex-end;gap:4px 18px}
.bot{display:flex;justify-content:space-between;align-items:flex-end;gap:24px;flex-wrap:wrap}
.bot-r{display:grid;gap:10px;justify-items:end}
.hero h1{font:700 clamp(26px,4.2vw,52px)/1.25 var(--serif);margin:0;text-shadow:0 2px 24px rgba(0,0,0,.65)}
.eyebrow{font:400 12px/1.6 var(--mono);letter-spacing:.14em;color:var(--accent);margin-bottom:10px}
.sub{font:400 11px/1.8 var(--mono);letter-spacing:.08em;color:#c3cbce;margin:10px 0 0}
.prod{display:flex;gap:22px;font:400 11px/1.6 var(--mono);letter-spacing:.1em;color:#cfd5d7}
.hint{font:400 10px/1.6 var(--mono);letter-spacing:.16em;color:var(--accent)}
@media (hover:none){.hint{display:none}}
@media (max-width:600px){
  .bot{flex-direction:column;align-items:flex-start;gap:14px}
  .bot-r{justify-items:start}
  .top nav{max-width:52%}
  .hero-logo-fallback{width:min(72vw,360px)}
}

/* ── 本文 ── */
.wrap{max-width:1040px;margin:0 auto;padding:0 max(16px,env(safe-area-inset-left))}
.sec{padding:clamp(72px,10vw,128px) 0}
.sec--alt{background:var(--ink2);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.label{font:400 11px/1 var(--mono);letter-spacing:.3em;color:var(--muted);margin:0 0 20px}
h2{font:700 clamp(22px,3vw,34px)/1.5 var(--serif);margin:0 0 24px;letter-spacing:.02em;overflow-wrap:anywhere}
.h2-sub{font-size:clamp(18px,2.2vw,22px);margin-top:72px}
.lead{max-width:44em;color:#d9d7d0;margin:0 0 32px}
.principles{list-style:none;margin:40px 0 0;padding:0;border-top:1px solid var(--line)}
.principles li{display:flex;gap:20px;align-items:baseline;padding:16px 0;border-bottom:1px solid var(--line);font:500 clamp(15px,1.8vw,18px)/1.6 var(--serif)}
.principles span{font:400 11px var(--mono);color:var(--muted);letter-spacing:.1em;flex:none}
.more{margin:28px 0 0}
.more a,.note-ah a,.fine a{color:var(--paper);text-underline-offset:4px}

.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(min(100%,290px),1fr));gap:16px;margin-top:8px}
.card{display:flex;flex-direction:column;gap:8px;padding:24px 22px;border:1px solid var(--line);background:var(--ink);text-decoration:none;transition:border-color .2s,transform .2s;min-width:0}
.card:hover{border-color:rgba(242,240,234,.4);transform:translateY(-2px)}
.card h3{margin:0;font:700 20px/1.3 var(--sans);letter-spacing:.04em}
.card p{margin:0;font-size:13.5px;line-height:1.8;color:#cfccc4;flex:1}
.tag{font:400 10px/1 var(--mono);letter-spacing:.2em;color:var(--muted)}
.url{font:400 11px/1.4 var(--mono);color:var(--muted);overflow-wrap:anywhere}
.card:hover .url{color:var(--accent)}

.dev{list-style:none;margin:0;padding:0;border-top:1px solid var(--line)}
.dev li{display:grid;grid-template-columns:150px 1fr auto;gap:8px 20px;align-items:baseline;padding:14px 0;border-bottom:1px solid var(--line);font-size:14px}
.dev b{font-weight:700;letter-spacing:.04em}
.dev span{color:#cfccc4;min-width:0}
.dev em{font:400 10px/1 var(--mono);font-style:normal;letter-spacing:.16em;color:var(--muted);white-space:nowrap}
@media (max-width:600px){.dev li{grid-template-columns:1fr auto}.dev span{grid-column:1/-1;grid-row:2}}

.links{display:grid;grid-template-columns:repeat(auto-fill,minmax(min(100%,220px),1fr));gap:12px}
.links a{display:flex;justify-content:space-between;align-items:baseline;gap:12px;padding:18px 20px;border:1px solid var(--line);text-decoration:none;transition:border-color .2s}
.links a:hover{border-color:rgba(242,240,234,.4)}
.links span{font:400 12px var(--mono);color:var(--muted);overflow-wrap:anywhere}
.note-ah{margin:36px 0 0;color:var(--muted);font-size:13.5px}

/* ── フォーム ── */
.form{max-width:600px}
.form label{display:block;font:400 11px/1 var(--mono);letter-spacing:.14em;color:var(--muted);margin:22px 0 8px}
.form input,.form select,.form textarea{width:100%;background:var(--ink);border:1px solid rgba(242,240,234,.22);color:var(--paper);padding:12px 14px;font:16px/1.6 var(--sans);border-radius:0;-webkit-appearance:none;appearance:none}
.form select{background-image:linear-gradient(45deg,transparent 50%,var(--muted) 50%),linear-gradient(135deg,var(--muted) 50%,transparent 50%);background-position:calc(100% - 20px) 55%,calc(100% - 15px) 55%;background-size:5px 5px;background-repeat:no-repeat}
.form textarea{min-height:160px;resize:vertical}
.form input:focus,.form select:focus,.form textarea:focus{border-color:var(--paper);outline:none}
.form button{margin-top:28px;padding:13px 36px;background:var(--paper);color:var(--ink);border:0;font:700 14px var(--sans);letter-spacing:.12em;cursor:pointer}
.form button:hover{background:#fff}
.form button:disabled{opacity:.5;cursor:default}
.hp{position:absolute;left:-9999px;width:1px;height:1px;overflow:hidden}
.status{min-height:1.6em;margin:16px 0 0;font-size:14px}
.status.ok{color:var(--accent)}
.status.err{color:var(--err)}
.fine{font-size:12px;color:var(--muted);margin:8px 0 0}

/* ── フッター ── */
.foot{padding:56px 0 calc(40px + env(safe-area-inset-bottom));border-top:1px solid var(--line);font-size:12px;color:var(--muted)}
.foot-in img{display:block;width:160px;height:auto;margin:0 0 20px -12px}
.foot p{margin:4px 0}

@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}.card,.card:hover{transition:none;transform:none}}