/* SHIRAKABA, LLC — s-kaba.com
   レイアウト: 1 カラムの縦スクロール。hero は modelog の「sky」の面、本文は「paper」の面、フッターは ink の面。
   区切りはカードでなく罫線と余白（palette.json の paper の項）。
   色は modelog VI パレット v0（design/vi/graphics/assets/palette.json）から取る。青は主ボタンだけ、オレンジは NEMO だけ。
   CSP が style-src 'self' なので、インラインの style 属性と <style> は使わない。 */

:root {
  --paper: #faf9f5;
  --sky: #e8f3fc;
  --ink: #0f1419;
  --ink-body: #536471;
  --blue: #1a6fd6;
  --blue-press: #155bb0;
  --line: rgba(15, 20, 25, 0.10);
  --on-ink: #f4f2ec;
  --on-ink-sub: #aab4bd;

  --font-ja: "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", "Yu Gothic UI", "Yu Gothic", system-ui, sans-serif;
  --font-en: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Hiragino Sans", sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;

  /* 文字サイズは 5 段: 本文 16 / 補足 13 / h3 20 / h2 32 / h1 46 */
  --fs-body: 16px;
  --fs-small: 13px;
  --fs-h3: 20px;
  --fs-h2: 32px;

  --wrap: 1080px;
  --gutter: 20px;
  color-scheme: light;
}

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-ja);
  font-size: var(--fs-body);
  line-height: 1.9;
  word-break: auto-phrase;
  text-wrap: pretty;
  -webkit-font-smoothing: antialiased;
}
html[lang="en"] body { font-family: var(--font-en); line-height: 1.65; word-break: normal; }

img { max-width: 100%; height: auto; display: block; }
a { color: var(--ink); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--ink-body); }
:focus-visible { outline: 2px solid var(--ink); outline-offset: 3px; border-radius: 4px; }

h1, h2, h3 { margin: 0; line-height: 1.35; text-wrap: balance; }
html[lang="en"] h1, html[lang="en"] h2 { letter-spacing: -0.015em; }
p { margin: 0; }

.wrap { max-width: var(--wrap); margin: 0 auto; padding-inline: var(--gutter); }

.skip {
  position: absolute; left: -9999px; top: 8px;
  background: var(--ink); color: var(--on-ink); padding: 8px 14px; border-radius: 8px; z-index: 10;
}
.skip:focus { left: 12px; }

/* ---- Header ---- */
.site-header { background: var(--sky); }
.site-header .wrap {
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding-block: 16px; flex-wrap: wrap;
}
.site-header .logo img { width: 120px; }
.site-nav { display: flex; align-items: center; gap: 8px 24px; flex-wrap: wrap; font-size: 14px; }
.site-nav .sections { display: flex; gap: 4px 20px; flex-wrap: wrap; }
.site-nav a { text-decoration: none; }
.site-nav a:hover { text-decoration: underline; color: var(--ink); }
.lang { display: flex; gap: 2px; font-size: var(--fs-small); border: 1px solid var(--line); border-radius: 999px; padding: 2px; }
.lang a, .lang span { padding: 2px 10px; border-radius: 999px; text-decoration: none; color: var(--ink-body); }
.lang [aria-current="true"] { background: var(--ink); color: var(--on-ink); }

/* ---- Hero ---- */
.hero { background: var(--sky); padding-block: 48px 80px; }
.hero .wrap {
  display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 56px; align-items: center;
}
.hero .hero-mark { height: 32px; width: auto; margin-bottom: 24px; }
.hero h1 { font-size: clamp(30px, 3.8vw, 44px); font-weight: 700; line-height: 1.3; }
html[lang="en"] .hero h1 { font-size: clamp(32px, 4.2vw, 46px); line-height: 1.12; }
.hero .lead { margin-top: 20px; color: var(--ink); max-width: 32em; }
.hero .actions { margin-top: 32px; display: flex; gap: 12px 24px; flex-wrap: wrap; align-items: center; }
.button {
  display: inline-flex; align-items: center;
  background: var(--blue); color: #fff; text-decoration: none; font-weight: 600; font-size: 15px;
  padding: 12px 24px; border-radius: 999px;
}
.button:hover { background: var(--blue-press); color: #fff; }
.text-link { font-size: 15px; }
.photo { margin: 0; border-radius: 24px; overflow: hidden; background: #ececec; }

/* ---- Sections ---- */
section { padding-block: 88px; }
section + section { border-top: 1px solid var(--line); }
.section-head { max-width: 40em; }
.section-head h2 { font-size: clamp(26px, 3.2vw, var(--fs-h2)); font-weight: 700; }
.section-head p { margin-top: 14px; color: var(--ink-body); }

/* Claude features: 罫線で区切った 3 列 */
.features { margin-top: 40px; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 32px; list-style: none; padding: 0; }
.feature { border-top: 1px solid var(--line); padding-top: 20px; display: flex; flex-direction: column; gap: 10px; }
.feature .icon { width: 44px; height: 44px; border-radius: 12px; background: var(--sky); display: grid; place-items: center; }
.feature .icon svg { width: 24px; height: 24px; }
.feature h3 { font-size: var(--fs-h3); font-weight: 700; margin-top: 6px; }
.feature p { color: var(--ink-body); }

/* Company: 罫線の表 */
.company { margin-top: 32px; max-width: 760px; border-top: 1px solid var(--line); }
.company dl { margin: 0; }
.company .row {
  display: grid; grid-template-columns: 11em minmax(0, 1fr); gap: 4px 24px;
  padding: 14px 0; border-bottom: 1px solid var(--line);
}
.company dt { font-weight: 600; font-size: 14px; color: var(--ink-body); padding-top: 2px; }
.company dd { margin: 0; }
.company .num { font-family: var(--font-mono); font-size: 15px; letter-spacing: 0.02em; }
.company .sub { display: block; font-size: var(--fs-small); color: var(--ink-body); margin-top: 2px; }

/* Founder */
.founder { margin-top: 24px; display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 2fr); gap: 40px; align-items: start; }
.founder .name { font-size: var(--fs-h3); font-weight: 700; letter-spacing: 0.04em; }
.founder .role { color: var(--ink-body); font-size: 14px; margin-top: 2px; }
.founder .links { margin-top: 12px; display: flex; gap: 8px 16px; flex-wrap: wrap; font-size: 14px; }
.founder .bio { display: grid; gap: 14px; max-width: 36em; }

/* ---- Footer ---- */
.site-footer { background: var(--ink); color: var(--on-ink); padding-block: 48px; }
.site-footer .wrap { display: flex; justify-content: space-between; align-items: flex-end; gap: 24px; flex-wrap: wrap; }
.site-footer .logo img { width: 112px; }
.site-footer nav { display: flex; gap: 8px 20px; flex-wrap: wrap; font-size: 14px; }
.site-footer a { color: var(--on-ink); text-decoration: none; }
.site-footer a:hover { text-decoration: underline; color: var(--on-ink); }
.site-footer :focus-visible { outline-color: var(--on-ink); }
.site-footer .copyright { font-size: 12px; color: var(--on-ink-sub); margin-top: 10px; }

/* ---- Legal pages ---- */
.legal { padding-block: 56px 88px; }
.legal .wrap { max-width: 760px; }
.legal h1 { font-size: clamp(26px, 3.6vw, var(--fs-h2)); }
.legal .meta { color: var(--ink-body); font-size: 14px; margin-top: 8px; }
.legal .note-lang { margin-top: 12px; font-size: 14px; color: var(--ink-body); }
.legal .intro { margin-top: 28px; }
.legal h2 { font-size: var(--fs-h3); margin-top: 40px; }
.legal p, .legal ul { margin-top: 12px; }
.legal ul { padding-left: 1.4em; }
.legal li + li { margin-top: 4px; }
.legal .back { margin-top: 48px; display: inline-block; }

/* ---- Responsive ---- */
@media (max-width: 860px) {
  .hero .wrap { grid-template-columns: minmax(0, 1fr); gap: 40px; }
  .hero .visual { max-width: 480px; }
  .features { grid-template-columns: minmax(0, 1fr); gap: 24px; }
  .founder { grid-template-columns: minmax(0, 1fr); gap: 16px; }
  .company .row { grid-template-columns: minmax(0, 1fr); gap: 2px; padding: 12px 0; }
  section { padding-block: 64px; }
}
@media (max-width: 520px) {
  .site-nav .sections { display: none; }
  .hero { padding-block: 32px 56px; }
}