/* ==========================================================================
   SolidLink corporate site ― shared stylesheet
   ========================================================================== */

:root{
  --ink:#12181F;
  --ink-soft:#4B5761;
  --ink-faint:#8A93A0;
  --bg:#F3F5F3;
  --surface:#FFFFFF;
  --surface-alt:#EBF2F0;
  --line:#E1E6E3;
  --line-strong:#CBD3CE;
  --accent:#1E70A3;
  --accent-deep:#15517A;
  --accent-soft:#E4EEF5;
  --shadow:0 1px 2px rgba(10,20,20,.05), 0 16px 36px rgba(10,20,20,.08);
  color-scheme: light;
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --ink:#EAF0EE;
    --ink-soft:#AFC0BC;
    --ink-faint:#71827C;
    --bg:#0E1315;
    --surface:#161C1F;
    --surface-alt:#1B2225;
    --line:#26302E;
    --line-strong:#334140;
    --accent:#4FA3D6;
    --accent-deep:#2F7FA8;
    --accent-soft:#142B36;
    --shadow:0 1px 2px rgba(0,0,0,.35), 0 16px 36px rgba(0,0,0,.45);
    color-scheme: dark;
  }
}
:root[data-theme="dark"]{
  --ink:#EAF0EE;
  --ink-soft:#AFC0BC;
  --ink-faint:#71827C;
  --bg:#0E1315;
  --surface:#161C1F;
  --surface-alt:#1B2225;
  --line:#26302E;
  --line-strong:#334140;
  --accent:#4FA3D6;
  --accent-deep:#2F7FA8;
  --accent-soft:#142B36;
  --shadow:0 1px 2px rgba(0,0,0,.35), 0 16px 36px rgba(0,0,0,.45);
  color-scheme: dark;
}

*{ box-sizing:border-box; }
html{ scroll-behavior:smooth; }
body{
  margin:0;
  background:var(--bg);
  color:var(--ink);
  font-family:"Noto Sans JP","Hiragino Sans",sans-serif;
  font-size:15.5px;
  line-height:1.85;
  -webkit-font-smoothing:antialiased;
}
img{ max-width:100%; display:block; }
a{ color:inherit; text-decoration:none; }
.mono{ font-family:"JetBrains Mono",ui-monospace,monospace; }

h1,h2,h3,h4{ font-family:"Zen Maru Gothic","Noto Sans JP",sans-serif; margin:0; text-wrap:balance; }

.wrap{ max-width:1160px; margin:0 auto; padding:0 28px; }
@media (max-width:680px){ .wrap{ padding:0 18px; } }

.kicker{
  font-family:"JetBrains Mono",monospace;
  font-size:11.5px; font-weight:700; letter-spacing:.14em; text-transform:uppercase;
  color:var(--accent-deep);
  display:flex; align-items:center; gap:9px;
}
.kicker .sq{ width:7px; height:7px; background:var(--accent); flex:0 0 auto; border-radius:1px; }

.sec-head{ margin-bottom:36px; }
.sec-title{ font-weight:900; font-size:clamp(23px,3vw,30px); line-height:1.5; margin:10px 0 0; }
.sec-lede{ color:var(--ink-soft); font-size:14.5px; max-width:58ch; margin:14px 0 0; }

section{ padding:72px 0; border-top:1px solid var(--line); }
section:first-of-type{ border-top:none; }

.btn{
  font-weight:700; font-size:14px; padding:12px 24px; border-radius:10px;
  display:inline-flex; align-items:center; gap:8px; border:1.5px solid transparent;
}
.btn.primary{ background:var(--ink); color:var(--bg); }
.btn.accent{ background:var(--accent); color:#fff; }
.btn.ghost{ background:transparent; color:var(--ink); border-color:var(--line-strong); }

/* ---------------- site header ---------------- */
.site-header{
  position:sticky; top:0; z-index:50;
  background:color-mix(in srgb, var(--bg) 86%, transparent);
  backdrop-filter:blur(8px);
  border-bottom:1px solid var(--line);
}
.site-header .in{
  max-width:1160px; margin:0 auto; padding:15px 28px;
  display:flex; align-items:center; justify-content:space-between; gap:18px;
}
.logo{ display:flex; align-items:center; gap:0; border-radius:9px; }
.logo img{ height:30px; width:auto; display:block; }
.logo.lg img{ height:40px; }

/* the logo artwork has solid black wordmark/no light variant, so on a dark
   background it needs its own light plate or it disappears into the page */
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]) .logo{ background:#F4F1E8; padding:6px 12px; }
}
:root[data-theme="dark"] .logo{ background:#F4F1E8; padding:6px 12px; }

.site-nav{ display:flex; align-items:center; gap:28px; }
.site-nav .links{ display:flex; gap:26px; font-size:13.5px; font-weight:700; color:var(--ink-soft); }
.site-nav .links a:hover{ color:var(--accent-deep); }
.site-nav .links a.active{ color:var(--ink); }
@media (max-width:820px){
  .site-nav .links{ display:none; }
}

/* ---------------- footer ---------------- */
.site-footer{ border-top:1px solid var(--line); padding:56px 0 30px; }
.foot-grid{ display:grid; grid-template-columns:1.4fr 1fr 1fr 1fr; gap:32px; margin-bottom:40px; }
@media (max-width:760px){ .foot-grid{ grid-template-columns:1fr 1fr; } }
@media (max-width:480px){ .foot-grid{ grid-template-columns:1fr; } }
.foot-grid .brand-col .logo{ margin-bottom:12px; }
.foot-grid .brand-col p{ font-size:13px; color:var(--ink-soft); max-width:34ch; }
.foot-col h5{ font-size:11.5px; font-family:"JetBrains Mono",monospace; letter-spacing:.1em; text-transform:uppercase; color:var(--ink-faint); margin-bottom:14px; font-weight:700; }
.foot-col ul{ list-style:none; margin:0; padding:0; display:flex; flex-direction:column; gap:9px; }
.foot-col a{ font-size:13.5px; color:var(--ink-soft); }
.foot-col a:hover{ color:var(--accent-deep); }
.foot-bottom{
  border-top:1px solid var(--line); padding-top:20px;
  display:flex; justify-content:space-between; flex-wrap:wrap; gap:10px;
  font-size:11.5px; color:var(--ink-faint); font-family:"JetBrains Mono",monospace;
}

/* ---------------- generic cards ---------------- */
.card{ background:var(--surface); border:1px solid var(--line); border-radius:16px; box-shadow:var(--shadow); }

.grid-3{ display:grid; grid-template-columns:repeat(3,1fr); gap:18px; }
.grid-2{ display:grid; grid-template-columns:1fr 1fr; gap:18px; }
@media (max-width:820px){ .grid-3{ grid-template-columns:1fr 1fr; } }
@media (max-width:560px){ .grid-3, .grid-2{ grid-template-columns:1fr; } }

/* ---------------- mobile nav (JS toggled) ---------------- */
.nav-toggle{
  display:none; width:38px; height:38px; border-radius:9px; border:1px solid var(--line-strong);
  background:var(--surface); align-items:center; justify-content:center; cursor:pointer;
}
.nav-toggle span{ display:block; width:16px; height:2px; background:var(--ink); position:relative; }
.nav-toggle span::before, .nav-toggle span::after{ content:""; position:absolute; left:0; width:16px; height:2px; background:var(--ink); }
.nav-toggle span::before{ top:-5px; } .nav-toggle span::after{ top:5px; }
@media (max-width:820px){ .nav-toggle{ display:flex; } }

.mobile-panel{
  display:none; flex-direction:column; gap:2px; padding:10px 28px 20px; border-bottom:1px solid var(--line);
}
.mobile-panel.open{ display:flex; }
.mobile-panel a{ padding:11px 4px; font-weight:700; font-size:14.5px; color:var(--ink-soft); border-bottom:1px solid var(--line); }
.mobile-panel a:last-child{ border-bottom:none; }

/* ---------------- page hero (shared shape, content differs) ---------------- */
.page-hero{ padding:58px 0 20px; border-top:none; }
.page-hero .eyebrow-row{ margin-bottom:16px; }
.page-hero h1{ font-weight:900; font-size:clamp(28px,4vw,42px); line-height:1.42; margin-bottom:16px; }
.page-hero p.lede{ color:var(--ink-soft); font-size:15.5px; max-width:56ch; }

/* ---------------- breadcrumbs ---------------- */
.crumbs{ font-size:12px; color:var(--ink-faint); padding:18px 0 0; font-family:"JetBrains Mono",monospace; }
.crumbs a{ color:var(--ink-faint); } .crumbs a:hover{ color:var(--accent-deep); }