/* HIDEN corporate site — tokens per discussion/2026-09-02-site-brand-guideline.md */
:root {
  --bg: oklch(0.17 0.008 230);
  --bg-2: oklch(0.2 0.008 230);
  --bg-light: oklch(0.965 0.003 230);
  --fg: oklch(0.95 0.004 230);
  --fg-2: oklch(0.72 0.01 230);
  --fg-3: oklch(0.60 0.01 230);
  --line: oklch(0.3 0.01 230);
  --accent: oklch(0.82 0.1 200);
  --serif: "Shippori Mincho B1", "Hiragino Mincho ProN", "Yu Mincho", serif;
  --sans: "Noto Sans JP", "Hiragino Sans", "Yu Gothic", sans-serif;
  --latin: "Geist", "Inter", system-ui, sans-serif;
  --w: 1200px;
  --text-w: 680px;
  --ease: cubic-bezier(.2, .7, .2, 1);
}
.light {
  --bg: oklch(0.965 0.003 230);
  --bg-2: oklch(0.93 0.004 230);
  --fg: oklch(0.2 0.008 230);
  --fg-2: oklch(0.42 0.01 230);
  --fg-3: oklch(0.54 0.01 230);
  --line: oklch(0.85 0.005 230);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0; background: var(--bg); color: var(--fg);
  font-family: var(--sans); font-size: 16px; line-height: 1.9; font-weight: 400;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
h1, h2, h3 { font-family: var(--serif); font-weight: 600; letter-spacing: .02em; margin: 0; text-wrap: balance; }
h1 { font-size: 60px; line-height: 1.45; }
h2 { font-size: 40px; line-height: 1.45; }
h3 { font-size: 28px; line-height: 1.5; }
p { margin: 0; }
.num, .latin { font-family: var(--latin); font-variant-numeric: tabular-nums; }
.wrap { width: min(var(--w), calc(100% - 48px)); margin: 0 auto; }
.text { max-width: var(--text-w); }
.muted { color: var(--fg-2); }
.small { font-size: 13px; line-height: 1.7; }
.kicker { font-family: var(--latin); font-size: 12px; letter-spacing: .08em; color: var(--fg-3); text-transform: uppercase; margin-bottom: 20px; }

/* nav */
.nav { position: fixed; top: 0; left: 0; right: 0; height: 72px; z-index: 50; transition: background-color 180ms ease-out; }
.nav.is-scrolled { background: color-mix(in oklch, var(--bg) 92%, transparent); backdrop-filter: blur(8px); }
.nav .wrap { height: 100%; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.wordmark { font-family: var(--latin); font-weight: 500; font-size: 18px; letter-spacing: .02em; }
.nav-links { display: flex; align-items: center; gap: 28px; font-size: 13px; font-weight: 500; color: var(--fg-2); overflow-x: auto; scrollbar-width: none; white-space: nowrap; }
.nav-links::-webkit-scrollbar { display: none; }
.nav-links a:hover { color: var(--fg); }
.nav-links .btn-line { margin-left: 4px; }

/* buttons */
.btn, .btn-line {
  display: inline-block; font-family: var(--sans); font-size: 14px; font-weight: 500; line-height: 1;
  padding: 14px 24px; border-radius: 3px; transition: opacity 180ms ease-out;
}
.btn { background: var(--fg); color: var(--bg); }
.btn:hover { opacity: .88; }
.btn-line { border: 1px solid var(--fg-3); color: var(--fg); padding: 13px 24px; }
.btn-line:hover { border-color: var(--fg); }
.nav .btn-line { padding: 10px 16px; font-size: 13px; }
.cta-row { display: flex; gap: 12px; flex-wrap: wrap; }

/* sections */
section { padding: 120px 0; border-top: 1px solid var(--line); }
section.light { background: var(--bg-light); color: var(--fg); }
section.no-line { border-top: 0; }
.sec-head { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: end; margin-bottom: 56px; }
.sec-head p { max-width: 36em; }
@media (max-width: 900px) { .sec-head { grid-template-columns: 1fr; gap: 20px; } }

/* hero */
.hero { min-height: 100svh; display: flex; flex-direction: column; justify-content: center; padding: 140px 0 56px; border-top: 0; position: relative; }
.hero h1 .w { display: inline-block; }
.hero .lead { margin: 28px 0 36px; max-width: 40em; font-size: 17px; }
.stats { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 32px; border-top: 1px solid var(--line); padding-top: 28px; margin-top: 72px; }
.stat .num { font-size: 32px; font-weight: 500; letter-spacing: -.02em; line-height: 1; }
.stat .num .acc { color: var(--accent); }
.stat .cap { margin-top: 8px; font-size: 12px; color: var(--fg-2); line-height: 1.6; }

/* 型 grid */
.kata-grid { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 32px 28px; border-top: 1px solid var(--line); padding-top: 32px; }
.kata-col .stage { font-size: 12px; color: var(--fg-3); letter-spacing: .04em; margin-bottom: 18px; }
.kata-col dl { margin: 0; }
.kata-col .k { margin-bottom: 20px; }
.kata-col dt, .kata-col dd { margin: 0; }
.kata-col .k dt, .kata-col .k b { display: block; font-family: var(--serif); font-weight: 600; font-size: 17px; line-height: 1.55; margin-bottom: 4px; }
.kata-col .k dd, .kata-col .k span { display: block; font-size: 12px; line-height: 1.7; color: var(--fg-2); }
.stage-line { display: flex; flex-wrap: wrap; gap: 10px 28px; font-size: 14px; }
.stage-line .num { color: var(--fg-2); margin-left: 4px; }
@media (max-width: 1100px) { .kata-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); } }
@media (max-width: 700px) { .kata-grid { grid-template-columns: 1fr 1fr; gap: 24px 20px; } }
/* 型 list */
.kata { border-top: 1px solid var(--line); }
.kata-row { display: grid; grid-template-columns: 96px 320px 1fr; gap: 32px; padding: 22px 0; border-bottom: 1px solid var(--line); transition: color 180ms ease-out; }
.kata-row .stage { font-family: var(--latin); font-size: 12px; letter-spacing: .06em; color: var(--fg-3); padding-top: 8px; }
.kata-row .name { font-family: var(--serif); font-weight: 600; font-size: 20px; line-height: 1.5; }
.kata-row .desc { color: var(--fg-2); font-size: 14px; line-height: 1.8; transition: color 180ms ease-out; }
.kata-row:hover .desc { color: var(--fg); }
@media (max-width: 900px) { .kata-row { grid-template-columns: 1fr; gap: 6px; } .kata-row .stage { padding-top: 0; } }

/* thesis */
.thesis { padding: 160px 0; text-align: left; }
.thesis h2 { font-size: 44px; max-width: 22em; }

/* system (3 layers) */
.layers { display: grid; gap: 16px; }
.layer { display: grid; grid-template-columns: 160px 1fr; gap: 24px; align-items: stretch; transition: opacity 180ms ease-out; }
@media (min-width: 901px) { .js .layer { opacity: .5; cursor: pointer; } .js .layer.is-on { opacity: 1; } }
.layer-name { font-family: var(--serif); font-weight: 600; font-size: 26px; line-height: 1.3; padding-top: 18px; }
.layer-name small { display: block; font-family: var(--sans); font-weight: 400; font-size: 12px; line-height: 1.6; color: var(--fg-2); margin-top: 6px; }
.panel { border: 1px solid var(--line); border-radius: 6px; padding: 20px 22px; background: var(--bg-2); }
.layer-people { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.person-mini { display: flex; align-items: center; gap: 14px; }
.person-mini img { width: 56px; height: 56px; object-fit: cover; border-radius: 50%; filter: grayscale(1); }
.person-mini b { display: block; font-weight: 500; }
.person-mini span { font-size: 12px; color: var(--fg-2); }
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip { border: 1px solid var(--line); border-radius: 3px; padding: 7px 11px; font-size: 13px; color: var(--fg); }
.os-grid { display: grid; grid-template-columns: 1fr 1.25fr 1fr; gap: 12px; }
.os-grid .lab { font-family: var(--sans); font-size: 12px; letter-spacing: .02em; color: var(--fg-3); margin-bottom: 10px; }
.os-grid .acc { color: var(--accent); }
.flow-line { margin-top: 20px; font-size: 13px; color: var(--fg-2); display: flex; gap: 28px; flex-wrap: wrap; }
@media (max-width: 900px) { .layer { grid-template-columns: 1fr; gap: 8px; } .layer-name { padding-top: 0; } .os-grid { grid-template-columns: 1fr; } .layer-people { grid-template-columns: 1fr; } }

/* mock UI */
.ui { border: 1px solid var(--line); border-radius: 6px; background: var(--bg-2); overflow: hidden; font-size: 13px; }
.ui-bar { display: flex; align-items: center; justify-content: space-between; padding: 10px 14px; border-bottom: 1px solid var(--line); font-family: var(--sans); font-size: 12px; letter-spacing: .02em; color: var(--fg-3); }
.ui-bar .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--accent); display: inline-block; margin-right: 8px; }
.ui-body { padding: 14px; display: grid; gap: 10px; }
.ui-row { display: grid; grid-template-columns: 1fr auto; gap: 12px; align-items: baseline; padding: 8px 0; border-bottom: 1px solid var(--line); }
.ui-row:last-child { border-bottom: 0; }
.ui-row .t { color: var(--fg); }
.ui-row .s { font-size: 12px; color: var(--fg-2); display: block; }
.ui-row .v { font-family: var(--latin); font-variant-numeric: tabular-nums; color: var(--fg-2); font-size: 12px; white-space: nowrap; }
.ui-row .v.good { color: var(--accent); }
.ui-tag { display: inline-block; border: 1px solid var(--line); border-radius: 3px; padding: 2px 6px; font-size: 11px; color: var(--fg-2); margin-left: 6px; }
.ui table { width: 100%; border-collapse: collapse; font-size: 12px; }
.ui th, .ui td { text-align: left; padding: 7px 8px; border-bottom: 1px solid var(--line); white-space: nowrap; }
.ui th { font-weight: 500; color: var(--fg-3); font-family: var(--sans); font-size: 11px; }
.ui td.n { font-family: var(--latin); font-variant-numeric: tabular-nums; text-align: right; }
.ui tr:last-child td { border-bottom: 0; }
.ui-thumbs { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; }
.ui-thumbs div { aspect-ratio: 9/16; border-radius: 4px; background: oklch(0.26 0.01 230); position: relative; }
.ui-thumbs div::after { content: attr(data-l); position: absolute; left: 6px; bottom: 6px; font-size: 10px; color: var(--fg-2); font-family: var(--latin); }
.ui-thumbs div.gen { border: 1px dashed var(--fg-3); background: none; }
.ui-thumbs div.gen::after { content: "生成中…"; font-family: var(--sans); }
.ui-approve { display: flex; gap: 8px; margin-top: 4px; }
.ui-approve span { border: 1px solid var(--line); border-radius: 3px; padding: 5px 10px; font-size: 12px; }
.ui-approve span.on { background: var(--fg); color: var(--bg); border-color: var(--fg); }

/* process */
.steps { display: grid; gap: 0; }
.step { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 56px; padding: 56px 0; border-top: 1px solid var(--line); align-items: center; }
.step > div { min-width: 0; }
.marquee { min-width: 0; max-width: 100%; }
.layers, .layer, .os-grid, .people, .person { min-width: 0; }
body { overflow-x: hidden; }
.step:first-child { border-top: 0; padding-top: 0; }
.step .no { font-family: var(--latin); font-size: 12px; letter-spacing: .08em; color: var(--fg-3); margin-bottom: 12px; }
.step h3 { margin-bottom: 14px; }
.step p { color: var(--fg-2); max-width: 30em; }
.step .who { margin-top: 16px; font-size: 12px; color: var(--fg-3); display: flex; gap: 16px; }
.step .who b { color: var(--fg-2); font-weight: 500; }
@media (max-width: 900px) { .step { grid-template-columns: 1fr; gap: 24px; } }

/* marquee (samples) */
.marquee { overflow-x: auto; overflow-y: hidden; scrollbar-width: none; -webkit-overflow-scrolling: touch; mask-image: linear-gradient(90deg, transparent, #000 6%, #000 94%, transparent); }
.marquee::-webkit-scrollbar { display: none; }
.marquee-track { display: flex; width: max-content; animation: marquee 48s linear infinite; }
.marquee:hover .marquee-track, .marquee:active .marquee-track { animation-play-state: paused; }
.marquee-track figure { margin: 0 12px 0 0; width: 150px; flex: none; }
.marquee-track img { width: 150px; aspect-ratio: 9/16; object-fit: cover; border-radius: 4px; }
.marquee-track figcaption { font-size: 11px; color: var(--fg-3); margin-top: 6px; font-family: var(--latin); }
@keyframes marquee { from { transform: translateX(0); } to { transform: translateX(-50%); } }

/* kata cards (step 2) */
.kata-cards { display: grid; gap: 10px; }
.kata-card { border: 1px solid var(--line); border-radius: 6px; padding: 16px 18px; background: var(--bg-2); }
.kata-card .stage { font-family: var(--sans); font-size: 11px; letter-spacing: .04em; color: var(--fg-3); }
.kata-card b { display: block; font-family: var(--serif); font-weight: 600; font-size: 17px; margin: 4px 0 2px; }
.kata-card span { font-size: 12px; color: var(--fg-2); }

/* people */
.people { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; }
.person { display: grid; grid-template-columns: 160px 1fr; gap: 28px; align-items: start; }
.person img { width: 160px; aspect-ratio: 3/4; object-fit: cover; border-radius: 4px; filter: grayscale(1); }
.person .role { font-family: var(--latin); font-size: 12px; letter-spacing: .04em; color: var(--fg-3); }
.person h3 { font-size: 26px; margin: 6px 0 2px; }
.person .en { font-family: var(--latin); font-size: 12px; color: var(--fg-3); margin-bottom: 14px; }
.person .side { font-family: var(--serif); font-size: 16px; font-weight: 600; margin-bottom: 10px; }
.person p { font-size: 14px; color: var(--fg-2); line-height: 1.85; }
@media (max-width: 900px) { .people { grid-template-columns: 1fr; gap: 40px; } .person { grid-template-columns: 120px 1fr; gap: 18px; } .person img { width: 120px; } }

/* recruit block */
.recruit-block { border: 1px solid var(--line); border-radius: 6px; padding: 40px; display: grid; grid-template-columns: 1fr auto; gap: 24px; align-items: center; transition: border-color 180ms ease-out; }
.recruit-block:hover { border-color: var(--fg-3); }
.recruit-block h3 { margin-bottom: 8px; }
.recruit-block .arrow { font-family: var(--latin); font-size: 28px; }
@media (max-width: 700px) { .recruit-block { grid-template-columns: 1fr; padding: 28px; } }

/* FAQ */
.faq { border-top: 1px solid var(--line); }
.faq-item { border-bottom: 1px solid var(--line); }
.faq-q { width: 100%; background: none; border: 0; color: var(--fg); font: inherit; font-weight: 500; text-align: left; padding: 22px 0; display: flex; justify-content: space-between; gap: 24px; cursor: pointer; }
.faq-q .ic { font-family: var(--latin); color: var(--fg-3); transition: transform 180ms ease-out; flex: none; }
.faq-item.is-open .faq-q .ic { transform: rotate(45deg); }
.faq-a { display: grid; grid-template-rows: 0fr; transition: grid-template-rows 180ms ease-out; }
.faq-item.is-open .faq-a { grid-template-rows: 1fr; }
.faq-a > div { overflow: hidden; }
.faq-a p { color: var(--fg-2); max-width: 40em; padding-bottom: 22px; font-size: 15px; }

/* form */
.form { display: grid; grid-template-columns: 1fr 1fr; gap: 20px 32px; max-width: 760px; }
.field { display: grid; gap: 6px; }
.field.full { grid-column: 1 / -1; }
.field label { font-size: 12px; color: var(--fg-2); }
.field input, .field textarea, .field select {
  background: none; border: 0; border-bottom: 1px solid var(--line); color: var(--fg);
  font: inherit; font-size: 15px; padding: 10px 0; border-radius: 0; outline: none; width: 100%;
  transition: border-color 180ms ease-out;
}
.field input:focus-visible, .field textarea:focus-visible, .field select:focus-visible { border-color: var(--fg); outline: 2px solid var(--accent); outline-offset: 3px; }
.field label .req { color: var(--fg-3); margin-left: 6px; font-size: 11px; }
.form-note { display: none; margin-top: 12px; font-size: 13px; color: var(--accent); }
.form-note.is-on { display: block; }
.field textarea { min-height: 96px; resize: vertical; }
.form .actions { grid-column: 1 / -1; display: flex; align-items: center; gap: 20px; margin-top: 8px; }
.form .note { font-size: 12px; color: var(--fg-3); }
.form-done { display: none; max-width: 40em; outline: none; }
.form.is-done { display: none; }
.form.is-done + .form-done { display: block; }
@media (max-width: 700px) { .form { grid-template-columns: 1fr; } }

/* footer */
footer { border-top: 1px solid var(--line); padding: 72px 0 40px; font-size: 13px; color: var(--fg-2); }
footer .cols { display: grid; grid-template-columns: 1.4fr 1fr; gap: 56px; }
footer table { border-collapse: collapse; width: 100%; }
footer th, footer td { text-align: left; vertical-align: top; padding: 8px 0; border-bottom: 1px solid var(--line); font-weight: 400; }
footer th { width: 8em; color: var(--fg-3); }
footer .links { display: grid; gap: 10px; align-content: start; }
footer .copy { margin-top: 40px; font-family: var(--latin); font-size: 12px; color: var(--fg-3); }
@media (max-width: 900px) { footer .cols { grid-template-columns: 1fr; } }

/* recruit page */
.list-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.list-4 .panel h3 { font-size: 20px; margin-bottom: 10px; }
.list-4 .panel p { font-size: 14px; color: var(--fg-2); }
.checks { display: grid; gap: 0; border-top: 1px solid var(--line); max-width: 760px; }
.checks li { list-style: none; display: grid; grid-template-columns: 24px 1fr; gap: 12px; padding: 18px 0; border-bottom: 1px solid var(--line); }
.checks li .ic { color: var(--accent); font-family: var(--latin); }
.checks li b { display: block; font-weight: 500; }
.checks li span { font-size: 14px; color: var(--fg-2); }
.checks { padding: 0; margin: 0; }
.jobs { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.jobs .panel h3 { font-size: 20px; margin-bottom: 8px; }
.jobs .panel p { font-size: 14px; color: var(--fg-2); }
@media (max-width: 900px) { .list-4 { grid-template-columns: 1fr 1fr; } .jobs { grid-template-columns: 1fr; } }
@media (max-width: 600px) { .list-4 { grid-template-columns: 1fr; } }

/* reveal */
.js .reveal { opacity: 0; transform: translateY(8px); transition: opacity 240ms var(--ease), transform 240ms var(--ease); }
.js .reveal.is-in { opacity: 1; transform: none; }
.js .hero h1 .w { opacity: 0; transform: translateY(8px); transition: opacity 240ms var(--ease), transform 240ms var(--ease); }
.js .hero h1.is-in .w { opacity: 1; transform: none; }

/* mobile type */
@media (max-width: 900px) {
  h1 { font-size: 27px; letter-spacing: 0; line-height: 1.5; } h2 { font-size: 28px; } h3 { font-size: 22px; }
  .stats { grid-template-columns: 1fr; gap: 0; }
  .stat { display: grid; grid-template-columns: 96px 1fr; gap: 16px; align-items: baseline; padding: 12px 0; border-bottom: 1px solid var(--line); }
  .stat:last-child { border-bottom: 0; }
  .stat .cap { margin-top: 0; }
  .thesis h2 { font-size: 30px; }
  section { padding: 80px 0; }
  .hero { padding-top: 110px; min-height: auto; }
  .hero .lead { font-size: 15px; margin: 20px 0 28px; }
  .stats { gap: 16px; margin-top: 48px; }
  .stat .num { font-size: 24px; }
  .nav .wrap { gap: 12px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .js .reveal, .js .hero h1 .w { opacity: 1; transform: none; transition: none; }
  .marquee-track { animation: none; }
  .layer, .faq-a, .faq-q .ic, .nav, .btn, .btn-line { transition: none; }
}

/* Codex review 2026-09-02: focus, mobile clipping, nav CTA */
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
.ui-note { font-size: 12px; color: var(--fg-3); margin-top: 8px; }
@media (max-width: 700px) {
  .nav-links { min-width: 0; gap: 16px; }
  .nav-links .btn-line { order: -1; margin-left: 0; }
  .ui { overflow-x: auto; overflow-y: hidden; }
  .ui table { min-width: 420px; }
  .ui-row { grid-template-columns: minmax(0, 1fr) auto; }
  .ui-row > div { min-width: 0; overflow-wrap: anywhere; }
  .ui-bar { white-space: normal; gap: 8px; }
}