:root{
  --bg:#f6f5f0; --surface:#ffffff; --ink:#1d2420; --muted:#5d6a62; --line:#dcdfd6;
  --accent:#2f7d4f; --accent-ink:#ffffff; --accent-soft:#e3f0e7; --warn:#a4611a; --code:#eef0e8;
  --radius:14px;
}
@media (prefers-color-scheme:dark){
  :root:not([data-theme="light"]){
    --bg:#141a16; --surface:#1c2420; --ink:#e8ece6; --muted:#9aa89f; --line:#2f3a33;
    --accent:#6cc48c; --accent-ink:#0f1a13; --accent-soft:#1f3327; --warn:#e0a458; --code:#222c26;
  }
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);
  font:16px/1.8 "Hiragino Kaku Gothic ProN","Yu Gothic UI","Meiryo",system-ui,sans-serif;-webkit-text-size-adjust:100%}
img{max-width:100%;height:auto;display:block}
a{color:var(--accent)}
.wrap{max-width:1040px;margin:0 auto;padding:0 20px}

/* header */
.site-header{position:sticky;top:0;z-index:20;background:color-mix(in srgb,var(--bg) 88%,transparent);
  backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.site-header .wrap{display:flex;align-items:center;justify-content:space-between;height:56px;gap:16px}
.brand{font-weight:700;letter-spacing:.02em;color:var(--ink);text-decoration:none}
.nav{display:flex;gap:18px;overflow-x:auto;scrollbar-width:none;font-size:14px}
.nav a{color:var(--muted);text-decoration:none;white-space:nowrap}
.nav a:hover{color:var(--accent)}

/* hero */
.hero{padding:56px 0 32px}
.eyebrow{color:var(--accent);font-weight:700;font-size:13px;letter-spacing:.12em}
h1{font-size:clamp(28px,5vw,44px);line-height:1.25;margin:.3em 0 .4em}
.lead{color:var(--muted);max-width:42em;font-size:17px}
.hero-img{margin-top:28px;border-radius:var(--radius);overflow:hidden;border:1px solid var(--line)}
.hero-img img{width:100%;aspect-ratio:16/8;object-fit:cover}
.chips{display:flex;flex-wrap:wrap;gap:8px;margin:20px 0 0;padding:0;list-style:none}
.chips li{background:var(--accent-soft);color:var(--accent);font-size:13px;font-weight:600;padding:4px 12px;border-radius:99px}

/* sections */
section{padding:48px 0;border-top:1px solid var(--line)}
section:first-of-type{border-top:0}
h2{font-size:clamp(22px,3.4vw,28px);margin:0 0 .6em;line-height:1.35}
h2 small{display:block;font-size:12px;letter-spacing:.14em;color:var(--accent);font-weight:700;margin-bottom:4px}
h3{font-size:18px;margin:1.6em 0 .5em}
p{margin:.6em 0}
.muted{color:var(--muted)}

.grid{display:grid;gap:16px}
.g2{grid-template-columns:repeat(2,1fr)}
.g3{grid-template-columns:repeat(3,1fr)}
@media(max-width:760px){.g2,.g3{grid-template-columns:1fr}}
@media(min-width:761px) and (max-width:960px){.g3{grid-template-columns:repeat(2,1fr)}}

.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:20px}
.card h3{margin-top:0}

figure{margin:0;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}
figure img{width:100%;aspect-ratio:4/3;object-fit:cover;cursor:zoom-in;background:var(--code)}
figure.contain img{object-fit:contain}
figure.diagram img{aspect-ratio:auto;object-fit:contain;background:var(--surface)}
.diagram-wrap{margin:16px 0 8px}
details{margin:12px 0}
summary{cursor:pointer;color:var(--accent);font-weight:600}
figcaption{padding:10px 14px;font-size:14px;color:var(--muted);line-height:1.6}
figcaption b{color:var(--ink)}

/* flow */
.flow{counter-reset:s;display:grid;gap:12px;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));padding:0;list-style:none;margin:20px 0}
.flow li{counter-increment:s;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:16px 16px 16px 56px;position:relative;font-size:15px}
.flow li::before{content:counter(s);position:absolute;left:14px;top:14px;width:28px;height:28px;border-radius:50%;
  background:var(--accent);color:var(--accent-ink);display:grid;place-items:center;font-weight:700;font-size:14px}
.flow b{display:block}

/* code / tables */
pre{background:var(--code);border:1px solid var(--line);border-radius:var(--radius);padding:16px;overflow-x:auto;
  font:13px/1.6 ui-monospace,"Cascadia Mono",Consolas,monospace;margin:12px 0}
code{background:var(--code);padding:1px 6px;border-radius:6px;font-size:.9em}
pre code{background:none;padding:0}
.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:var(--radius);background:var(--surface)}
table{border-collapse:collapse;width:100%;font-size:14px;min-width:560px}
th,td{text-align:left;padding:10px 14px;border-bottom:1px solid var(--line);vertical-align:top}
th{background:var(--code);font-size:13px;white-space:nowrap}
tr:last-child td{border-bottom:0}
td.num,th.num{text-align:right;white-space:nowrap}

.note{border-left:4px solid var(--warn);background:var(--surface);padding:12px 16px;border-radius:0 var(--radius) var(--radius) 0;font-size:15px;margin:16px 0}

/* works list */
.work-card{display:grid;grid-template-columns:1.1fr 1fr;background:var(--surface);border:1px solid var(--line);
  border-radius:var(--radius);overflow:hidden;text-decoration:none;color:inherit;transition:transform .2s,box-shadow .2s}
.work-card:hover{transform:translateY(-2px);box-shadow:0 10px 30px rgba(0,0,0,.1)}
.work-card img{width:100%;height:100%;min-height:220px;object-fit:cover}
.work-card .body{padding:24px}
.work-card h3{margin:.2em 0 .4em;font-size:22px}
@media(max-width:760px){.work-card{grid-template-columns:1fr}.work-card img{min-height:0;aspect-ratio:16/9}}
.soon{border:1.5px dashed var(--line);border-radius:var(--radius);padding:24px;color:var(--muted);text-align:center;margin-top:16px}

footer{padding:40px 0;border-top:1px solid var(--line);color:var(--muted);font-size:14px}

/* lightbox */
.lb{position:fixed;inset:0;background:rgba(0,0,0,.88);display:none;align-items:center;justify-content:center;z-index:50;padding:20px;cursor:zoom-out}
.lb.on{display:flex}
.lb img{max-width:100%;max-height:100%;object-fit:contain;border-radius:8px}


/* home: works grid */
.works-grid{display:grid;gap:20px;grid-template-columns:repeat(auto-fill,minmax(300px,1fr))}
.work-tile{display:flex;flex-direction:column;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  overflow:hidden;text-decoration:none;color:inherit;transition:transform .2s,box-shadow .2s}
.work-tile[hidden]{display:none}
.work-tile:hover{transform:translateY(-2px);box-shadow:0 10px 30px rgba(0,0,0,.1)}
.work-tile img{width:100%;aspect-ratio:16/10;object-fit:cover;background:var(--code)}
.work-tile .body{padding:18px 20px 20px;display:flex;flex-direction:column;gap:6px;flex:1}
.work-tile h3{margin:0;font-size:20px;line-height:1.4}
.work-tile p{margin:0;font-size:15px}
.work-tile .chips{margin-top:auto;padding-top:10px}
.work-tile .chips li{font-size:12px;padding:2px 10px}
.filter{display:flex;flex-wrap:wrap;gap:8px;margin:0 0 20px}
.filter button{font:inherit;font-size:14px;color:var(--muted);background:var(--surface);border:1px solid var(--line);
  border-radius:99px;padding:5px 16px;cursor:pointer}
.filter button[aria-pressed="true"]{background:var(--accent);color:var(--accent-ink);border-color:var(--accent);font-weight:700}