/* ============================================================
   山本企画合同会社 — Corporate Site
   Built on ROBOVILL Foundations design system tokens.
   Light + Dark (toggle, persisted). Dark is the system default.
   ============================================================ */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&family=JetBrains+Mono:wght@400;500;700&family=Noto+Sans+JP:wght@400;500;700;800&display=swap');

:root {
  --font-base: "Inter", "Noto Sans JP", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", Menlo, monospace;

  /* LIGHT (default) */
  --c-brand-1:#399ECC; --c-brand-2:#0087AA; --c-brand-3:#0090A8;
  --c-accent-1:#219DDD; --c-accent-2:#69AAC6; --c-soft:#778899;
  --c-bg:#ffffff; --c-bg-soft:#f9fafb; --c-bg-mute:#f3f4f6;
  --c-text-1:#1f2937; --c-text-2:#4b5563; --c-text-3:#6b7280;
  --c-border:#e5e7eb; --c-code-bg:#f3f4f6;
  --c-tip:#399ECC; --c-info:#778899; --c-warn:#d97706; --c-danger:#dc2626;

  --nav-h:60px; --measure:1180px;
  --radius-sm:6px; --radius-md:8px; --radius-lg:12px; --radius-pill:999px;
  --ease:cubic-bezier(.4,0,.2,1); --dur:.25s;
  --shadow-2:0 4px 12px rgba(33,157,221,.18);
  --shadow-3:0 12px 32px rgba(15,17,23,.12);
}

* { box-sizing:border-box; }
html { scroll-behavior:smooth; }
body { margin:0; font-family:var(--font-base); background:var(--c-bg) !important; color:var(--c-text-1);
  -webkit-font-smoothing:antialiased; text-rendering:optimizeLegibility;
  transition:background .3s var(--ease), color .3s var(--ease); }
a { color:inherit; text-decoration:none; }
img { max-width:100%; display:block; }

/* ---------- shared rhythm ---------- */
.wrap { max-width:var(--measure); margin:0 auto; padding:0 48px; }
.eyebrow { display:inline-flex; align-items:center; gap:12px; font-size:13px; font-weight:600;
  letter-spacing:.16em; color:var(--c-brand-2); margin:0 0 18px; }
.eyebrow::before { content:""; width:30px; height:2px; background:var(--c-brand-1); border-radius:2px; }
.sec-title { font-size:34px; font-weight:700; letter-spacing:-.01em; line-height:1.2; margin:0; }
.sec-lead { font-size:18px; line-height:1.7; color:var(--c-text-3); margin:16px 0 0; max-width:680px; }

/* ---------- Nav ---------- */
.nav { position:sticky; top:0; z-index:40; height:var(--nav-h); display:flex; align-items:center;
  gap:28px; padding:0 48px; border-bottom:1px solid var(--c-border);
  background:color-mix(in srgb, var(--c-bg) 72%, transparent); backdrop-filter:blur(10px); }
.brand { display:flex; align-items:center; gap:11px; font-weight:700; font-size:16px; color:var(--c-text-1);
  white-space:nowrap; letter-spacing:.01em; }
.brand .mark { width:34px; height:34px; object-fit:contain; display:block; flex:none; }
.brand .sub { font-size:11px; font-weight:500; color:var(--c-text-3); letter-spacing:.04em; margin-left:2px; }
.nav__links { display:flex; gap:26px; margin-left:8px; }
.nav__link { font-size:14px; font-weight:500; color:var(--c-text-2); transition:color var(--dur) var(--ease); }
.nav__link:hover { color:var(--c-brand-1); }
.nav__link.is-active { color:var(--c-brand-1); font-weight:600; }
.nav__right { margin-left:auto; display:flex; align-items:center; gap:12px; }
.icon-btn { width:38px; height:38px; display:grid; place-items:center; border:1px solid var(--c-border);
  border-radius:var(--radius-md); background:var(--c-bg-soft); color:var(--c-text-2); cursor:pointer;
  transition:var(--dur) var(--ease); }
.icon-btn:hover { color:var(--c-brand-1); border-color:var(--c-brand-1); }
.icon-btn svg { width:18px; height:18px; }
.nav__cta { display:inline-flex; }
.nav__burger { display:none; }

/* ---------- Buttons ---------- */
.btn { font-family:inherit; font-weight:600; font-size:14px; border-radius:var(--radius-sm);
  padding:11px 24px; border:1px solid transparent; cursor:pointer; white-space:nowrap;
  display:inline-flex; align-items:center; gap:8px; transition:all var(--dur) var(--ease); }
.btn.brand { background:var(--c-accent-1); border-color:var(--c-accent-1); color:#fff; }
.btn.brand:hover { background:var(--c-brand-2); border-color:var(--c-brand-2); color:#fff;
  transform:translateY(-2px); box-shadow:var(--shadow-2); }
.btn.alt { background:var(--c-bg-soft); border-color:var(--c-border); color:var(--c-text-1); }
.btn.alt:hover { border-color:var(--c-brand-1); color:var(--c-brand-1); transform:translateY(-2px); }
.btn.sm { padding:8px 16px; font-size:13px; }

/* ---------- Hero ---------- */
.hero { position:relative; overflow:hidden; border-bottom:1px solid var(--c-border); }
.hero__grid { position:absolute; inset:0; pointer-events:none; opacity:.5;
  background-image:linear-gradient(var(--c-border) 1px,transparent 1px),linear-gradient(90deg,var(--c-border) 1px,transparent 1px);
  background-size:64px 64px; -webkit-mask-image:radial-gradient(120% 80% at 78% 12%, #000 0%, transparent 62%);
  mask-image:radial-gradient(120% 80% at 78% 12%, #000 0%, transparent 62%); }
.hero .wrap { position:relative; padding-top:96px; padding-bottom:104px; }
.hero__copy { position:relative; z-index:2; max-width:660px; }
.hero__canvas { position:absolute; top:0; right:0; height:100%; width:60%; z-index:1;
  -webkit-mask-image:linear-gradient(90deg, transparent 0%, #000 26%);
  mask-image:linear-gradient(90deg, transparent 0%, #000 26%); }
.hero__eyebrow { font-family:var(--font-mono); font-size:14px; letter-spacing:.1em; color:var(--c-text-3);
  margin:0 0 22px; display:flex; align-items:center; gap:14px; }
.hero__eyebrow .est { padding:3px 10px; border:1px solid var(--c-border); border-radius:var(--radius-pill);
  color:var(--c-brand-2); font-weight:500; }
.hero__name { font-size:64px; font-weight:800; line-height:1.12; letter-spacing:-.025em; margin:0;
  background:linear-gradient(120deg,var(--c-brand-1),var(--c-accent-1));
  -webkit-background-clip:text; background-clip:text; -webkit-text-fill-color:transparent; }
.hero__office { font-size:20px; font-weight:500; color:var(--c-text-2); margin:0 0 18px; letter-spacing:.02em; }
.hero__tag { font-size:32px; font-weight:700; color:var(--c-text-1); line-height:1.4; margin:34px 0 0;
  max-width:880px; letter-spacing:-.01em; }
.hero__tag .em { color:var(--c-brand-2); }

/* ---------- Concept flow (把握→予測→行動) ---------- */
.cflow { display:grid; grid-template-columns:1fr auto 1fr auto 1fr; align-items:start; gap:0; }
.cstep { text-align:center; padding:0 28px; }
.cstep .cicon { width:76px; height:76px; margin:0 auto 24px; border:1.5px solid var(--c-border);
  border-radius:50%; display:grid; place-items:center; color:var(--c-brand-1); background:var(--c-bg-soft);
  transition:border-color var(--dur) var(--ease), color var(--dur) var(--ease); }
.cstep .cicon svg { width:34px; height:34px; }
.cflow .cstep:hover .cicon { border-color:var(--c-brand-1); }
.cstep .en { font-family:var(--font-mono); font-size:13px; letter-spacing:.16em; color:var(--c-brand-1); margin-bottom:14px; }
.cstep .jp { font-size:30px; font-weight:800; letter-spacing:.02em; margin:12px 0 12px; color:var(--c-text-1); }
.cstep p { font-size:15px; line-height:1.7; color:var(--c-text-2); margin:0; }
.carrow { color:var(--c-brand-1); font-size:30px; padding-top:18px; }
.hero__sub { font-size:18px; line-height:1.7; color:var(--c-text-3); margin:24px 0 0; max-width:660px; }
.hero__actions { display:flex; gap:14px; margin-top:40px; }

/* ---------- Section base ---------- */
.section { padding:84px 0; border-bottom:1px solid var(--c-border); }
.section.soft { background:var(--c-bg-soft); }
.section__head { margin-bottom:48px; }

/* ---------- Value flow (3 steps) ---------- */
.vflow { display:grid; grid-template-columns:repeat(3,1fr); gap:20px; }
.vcard { border:1px solid var(--c-border); border-radius:var(--radius-lg); background:var(--c-bg);
  padding:34px 30px; transition:all var(--dur) var(--ease); }
.vcard:hover { border-color:var(--c-brand-1); transform:translateY(-2px); box-shadow:var(--shadow-2); }
.vstep { font-family:var(--font-mono); font-size:14px; letter-spacing:.1em; color:var(--c-brand-1); margin-bottom:18px; }
.vcard h3 { font-size:24px; font-weight:700; margin:0 0 12px; letter-spacing:-.01em; }
.vcard p { font-size:15px; line-height:1.7; color:var(--c-text-2); margin:0; }

/* ---------- Stats ---------- */
.stats { display:grid; grid-template-columns:repeat(4,1fr); gap:0; }
.stat { padding:0 36px; border-left:1px solid var(--c-border); }
.stat:first-child { padding-left:0; border-left:none; }
.stat .num { font-size:64px; font-weight:800; line-height:1; letter-spacing:-.03em; white-space:nowrap;
  background:linear-gradient(120deg,var(--c-brand-1),var(--c-accent-1));
  -webkit-background-clip:text; background-clip:text; -webkit-text-fill-color:transparent; }
.stat .num .u { font-size:26px; font-weight:700; margin-left:5px; }
.stat .cap { font-size:15px; line-height:1.55; color:var(--c-text-2); margin-top:16px; font-weight:500; }

/* ---------- Tech cards ---------- */
.tech-grid { display:grid; grid-template-columns:repeat(4,1fr); gap:16px; }
.tcard { border:1px solid var(--c-border); border-radius:var(--radius-md); background:var(--c-bg-soft);
  padding:22px 24px; }
.tcard .role { font-size:13px; font-weight:600; color:var(--c-text-3); letter-spacing:.04em; margin-bottom:9px; }
.tcard .tech { font-family:var(--font-mono); font-size:19px; font-weight:500; color:var(--c-text-1); }

/* ---------- Process / Service (interactive stepper) ---------- */
.proc { --proc-progress:0%; }
.proc__steps { display:grid; grid-template-columns:repeat(5,1fr); position:relative; margin-bottom:36px; }
.proc__steps::before { content:""; position:absolute; left:10%; right:10%; top:21px; height:2px; background:var(--c-border); }
.proc__steps::after { content:""; position:absolute; left:10%; top:21px; height:2px; background:var(--c-brand-1);
  width:var(--proc-progress); transition:width .4s var(--ease); }
.proc__step { position:relative; z-index:1; background:none; border:none; cursor:pointer; font-family:inherit;
  display:flex; flex-direction:column; align-items:center; gap:13px; padding:0; }
.proc__dot { width:44px; height:44px; border-radius:50%; display:grid; place-items:center; font-family:var(--font-mono);
  font-size:14px; font-weight:700; background:var(--c-bg); border:2px solid var(--c-border); color:var(--c-text-3);
  transition:all .25s var(--ease); }
.proc__step:hover .proc__dot { border-color:var(--c-brand-1); color:var(--c-brand-1); }
.proc__step.is-done .proc__dot { border-color:var(--c-brand-1); color:var(--c-brand-1); }
.proc__step.is-active .proc__dot { background:var(--c-brand-1); border-color:var(--c-brand-1); color:#fff;
  box-shadow:0 4px 12px rgba(33,157,221,.28); }
.proc__label { font-size:14px; font-weight:600; color:var(--c-text-3); text-align:center; line-height:1.4;
  transition:color .25s var(--ease); }
.proc__step.is-active .proc__label, .proc__step:hover .proc__label { color:var(--c-text-1); }

.proc__panel { display:none; border:1px solid var(--c-border); border-radius:var(--radius-lg);
  background:var(--c-bg-soft); padding:36px 40px; }
.proc__panel.is-active { display:block; animation:procfade .35s var(--ease); }
@keyframes procfade { from{opacity:0; transform:translateY(8px);} to{opacity:1; transform:none;} }
.proc__phead { display:flex; align-items:baseline; gap:16px; margin-bottom:6px; }
.proc__pnum { font-family:var(--font-mono); font-size:15px; color:var(--c-brand-1); font-weight:700; }
.proc__phead h3 { font-size:25px; font-weight:700; margin:0; letter-spacing:-.01em; }
.proc__pdesc { font-size:15px; color:var(--c-text-3); line-height:1.7; margin:0 0 26px; max-width:660px; }
.proc__tasks { display:grid; grid-template-columns:repeat(auto-fill,minmax(232px,1fr)); gap:13px; }
.ptask { display:flex; gap:12px; align-items:flex-start; padding:15px 18px; background:var(--c-bg);
  border:1px solid var(--c-border); border-radius:var(--radius-md); transition:border-color .2s var(--ease); }
.ptask:hover { border-color:var(--c-brand-1); }
.ptask__mk { width:8px; height:8px; margin-top:7px; flex:none; transform:rotate(45deg);
  border:1.5px solid var(--c-brand-1); border-radius:1px; }
.ptask__t { font-size:15px; font-weight:600; color:var(--c-text-1); }
.ptask__d { font-size:12.5px; color:var(--c-text-3); margin-top:4px; line-height:1.5; }

/* ---------- CTA band ---------- */
.cta { padding:84px 0; text-align:center; }
.cta h2 { font-size:40px; font-weight:800; letter-spacing:-.02em; margin:0 0 18px; }
.cta p { font-size:18px; color:var(--c-text-3); margin:0 0 32px; }
.cta__actions { display:flex; gap:14px; justify-content:center; }

/* ---------- Footer ---------- */
.footer { border-top:1px solid var(--c-border); background:var(--c-bg-soft); }
.footer .wrap { padding:48px; display:grid; grid-template-columns:1.4fr 1fr 1fr; gap:40px; }
.footer .brand { margin-bottom:14px; }
.footer__about { font-size:14px; line-height:1.7; color:var(--c-text-3); max-width:340px; }
.footer__col h4 { font-size:13px; font-weight:700; letter-spacing:.08em; color:var(--c-text-2); margin:0 0 14px; }
.footer__col a { display:block; font-size:14px; color:var(--c-text-3); padding:5px 0; transition:color var(--dur); }
.footer__col a:hover { color:var(--c-brand-1); }
.footer__bar { border-top:1px solid var(--c-border); }
.footer__bar .wrap { padding:20px 48px; display:flex; justify-content:space-between; align-items:center;
  font-size:13px; color:var(--c-text-3); }

/* ---------- Page header (sub pages) ---------- */
.pagehead { padding:72px 0 56px; border-bottom:1px solid var(--c-border); }
.pagehead h1 { font-size:48px; font-weight:800; letter-spacing:-.02em; margin:0; }
.pagehead .lead { font-size:18px; line-height:1.7; color:var(--c-text-3); margin:18px 0 0; max-width:680px; }

/* ---------- Profile table (company) ---------- */
.ptable { border-top:1px solid var(--c-border); }
.prow { display:grid; grid-template-columns:220px 1fr; gap:40px; padding:26px 0;
  border-bottom:1px solid var(--c-border); align-items:baseline; }
.prow .k { font-size:14px; font-weight:600; letter-spacing:.06em; color:var(--c-brand-2); }
.prow .v { font-size:17px; line-height:1.6; color:var(--c-text-1); font-weight:500; }
.prow .v .sub { display:block; font-size:14px; color:var(--c-text-3); font-weight:400; margin-top:6px; }

/* ---------- Timeline (works) ---------- */
.tl { position:relative; padding-left:30px; }
.tl::before { content:""; position:absolute; left:7px; top:6px; bottom:6px; width:2px; background:var(--c-border); }
.tl-era { position:relative; margin:0 0 6px; padding:30px 0 8px; }
.tl-era:first-child { padding-top:6px; }
.tl-era__name { display:flex; align-items:baseline; gap:14px; margin-bottom:6px; }
.tl-era__span { font-family:var(--font-mono); font-size:15px; color:var(--c-brand-2); font-weight:500; }
.tl-era__label { font-size:15px; font-weight:700; color:var(--c-text-1); }
.tl-item { position:relative; display:grid; grid-template-columns:74px 1fr; gap:20px; padding:11px 0;
  border-bottom:1px solid var(--c-border); align-items:baseline; }
.tl-item::before { content:""; position:absolute; left:-26px; top:18px; width:11px; height:11px;
  border-radius:50%; background:var(--c-bg); border:2px solid var(--c-brand-1); }
.tl-year { font-family:var(--font-mono); font-size:15px; color:var(--c-brand-1); font-weight:500; }
.tl-desc { font-size:16px; line-height:1.5; color:var(--c-text-1); font-weight:500; }
.tl-desc .meta { color:var(--c-text-3); font-weight:400; }

/* ---------- Contact ---------- */
.contact-grid { display:grid; grid-template-columns:1fr 0.9fr; gap:64px; align-items:start; }
.field { margin-bottom:20px; }
.field label { display:block; font-size:14px; font-weight:600; color:var(--c-text-2); margin-bottom:8px; }
.field input, .field textarea, .field select { width:100%; font-family:inherit; font-size:15px;
  color:var(--c-text-1); background:var(--c-bg-soft); border:1px solid var(--c-border);
  border-radius:var(--radius-md); padding:12px 14px; transition:border-color var(--dur), box-shadow var(--dur); }
.field input:focus, .field textarea:focus, .field select:focus { outline:none; border-color:var(--c-brand-1);
  box-shadow:0 0 0 3px color-mix(in srgb, var(--c-brand-1) 18%, transparent); }
.field textarea { resize:vertical; min-height:130px; }
.info-block { border:1px solid var(--c-border); border-radius:var(--radius-lg); background:var(--c-bg-soft);
  padding:30px 32px; }
.info-row { padding:18px 0; border-bottom:1px solid var(--c-border); }
.info-row:last-child { border-bottom:none; }
.info-row .k { font-size:13px; font-weight:600; letter-spacing:.06em; color:var(--c-brand-2); margin-bottom:7px; }
.info-row .v { font-size:16px; color:var(--c-text-1); font-family:var(--font-mono); letter-spacing:.01em; }
.info-row .v.ph { color:var(--c-text-3); }

/* reveal on scroll */
.reveal { opacity:0; transform:translateY(18px); transition:opacity .6s var(--ease), transform .6s var(--ease); }
.reveal.in { opacity:1; transform:none; }
@media (prefers-reduced-motion:reduce){ .reveal{ opacity:1; transform:none; transition:none; } }

/* ---------- Responsive ---------- */
@media (max-width:900px){
  .wrap, .nav, .footer .wrap, .footer__bar .wrap { padding-left:24px; padding-right:24px; }
  .nav__links, .nav__cta { display:none; }
  .nav__burger { display:grid; }
  .nav.open .nav__links { display:flex; position:absolute; top:var(--nav-h); left:0; right:0;
    flex-direction:column; gap:0; background:var(--c-bg); border-bottom:1px solid var(--c-border); padding:8px 24px 16px; }
  .nav.open .nav__link { padding:12px 0; border-bottom:1px solid var(--c-border); }
  .hero__name { font-size:42px; } .hero__tag { font-size:24px; }
  .hero__canvas { display:none; }
  .cflow { grid-template-columns:1fr; gap:8px; }
  .carrow { transform:rotate(90deg); padding:4px 0; }
  .cstep { padding:16px 0; }
  .vflow, .stats, .tech-grid { grid-template-columns:1fr; }
  .stat { padding:24px 0; border-left:none; border-top:1px solid var(--c-border); }
  .stat:first-child { padding-top:0; border-top:none; }
  .contact-grid { grid-template-columns:1fr; gap:40px; }
  .prow { grid-template-columns:1fr; gap:8px; }
  .footer .wrap { grid-template-columns:1fr; gap:28px; }
  .pagehead h1 { font-size:36px; }
  .proc__steps { grid-template-columns:repeat(5,1fr); }
  .proc__label { font-size:11px; }
  .proc__panel { padding:26px 22px; }
  .proc__tasks { grid-template-columns:1fr; }
}

/* ---------- Architecture map (process → architecture → tech) ---------- */
.archmap { border:1px solid var(--c-border); border-radius:var(--radius-lg); background:var(--c-bg); overflow:hidden; }
.archrow { display:grid; grid-template-columns:336px 1fr; gap:36px; align-items:center;
  padding:24px 34px; border-top:1px solid var(--c-border); }
.archrow:first-child { border-top:none; }
.archrow__stage { display:flex; gap:18px; align-items:center; }
.archrow__badge { width:46px; height:46px; border-radius:50%; flex:none; display:grid; place-items:center;
  font-family:var(--font-mono); font-size:15px; font-weight:700; color:var(--c-brand-1);
  border:2px solid var(--c-brand-1); background:var(--c-bg); }
.archrow__name { font-size:19px; font-weight:700; color:var(--c-text-1); letter-spacing:-.01em; }
.archrow__draw { font-size:13px; color:var(--c-text-3); margin-top:5px; line-height:1.45; }
.archrow__draw .arrow { color:var(--c-brand-1); margin-right:6px; }
.archrow__tags { display:flex; flex-wrap:wrap; gap:10px; }
.techchip { font-family:var(--font-mono); font-size:14px; font-weight:500; color:var(--c-text-1);
  background:var(--c-bg-soft); border:1px solid var(--c-border); border-radius:var(--radius-sm); padding:8px 15px;
  transition:border-color .2s var(--ease), color .2s var(--ease); }
.archrow:hover .techchip { border-color:var(--c-brand-1); }
.archnote { margin-top:18px; font-size:13px; color:var(--c-text-3); line-height:1.7; }
@media (max-width:900px){
  .archrow { grid-template-columns:1fr; gap:18px; padding:22px 22px; }
}