/* =========================================================
   next-k.site — dark engineering theme (2026-06)
   ========================================================= */

:root {
  /* hex fallbacks */
  --bg: #0e1116;
  --bg2: #151922;
  --ink: #f2f3f5;
  --muted: #9aa0ab;
  --faint: #666c78;
  --line: #3a404c;
  --green: #56d896;
  --paper: #fafafa;
  --paper-ink: #23262c;
  --paper-muted: #5d6068;
  --paper-faint: #898c93;
  --paper-line: #dddfe3;
  --green-deep: #1e7a4e;

  --font-jp: "Hiragino Sans", "Noto Sans JP", "Yu Gothic", "Meiryo", system-ui, sans-serif;
  --font-mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, monospace;

  --pad-x: clamp(20px, 4.5vw, 52px);
  --max-w: 1280px;
}

@supports (color: oklch(0.5 0.1 150)) {
  :root {
    --bg: oklch(0.17 0.012 250);
    --bg2: oklch(0.21 0.014 250);
    --ink: oklch(0.96 0.004 250);
    --muted: oklch(0.68 0.01 250);
    --faint: oklch(0.5 0.012 250);
    --line: oklch(0.32 0.014 250);
    --green: oklch(0.82 0.16 150);
    --paper: oklch(0.985 0.002 250);
    --paper-ink: oklch(0.22 0.01 250);
    --paper-muted: oklch(0.45 0.01 250);
    --paper-faint: oklch(0.55 0.008 250);
    --paper-line: oklch(0.88 0.005 250);
    --green-deep: oklch(0.5 0.12 155);
  }
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  font-family: var(--font-jp);
  background: var(--bg);
  color: var(--ink);
  font-size: 15px;
  line-height: 1.9;
  font-feature-settings: "palt";
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul, ol { padding-left: 1.4em; }

.wrap { max-width: var(--max-w); margin: 0 auto; }

/* ---- grid backdrop ---- */
.grid-bg { position: relative; overflow: hidden; }
.grid-bg::before {
  content: "";
  position: absolute; inset: 0;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 120px 120px;
  opacity: .25;
  pointer-events: none;
}
.grid-bg > * { position: relative; }

/* ---- nav ---- */
.nav {
  display: flex; justify-content: space-between; align-items: center;
  padding: 24px var(--pad-x);
  gap: 18px;
}
.nav .logo {
  display: flex; align-items: center; gap: 10px;
  font-family: var(--font-mono);
  font-size: 15px; font-weight: 700; letter-spacing: .02em;
  color: var(--ink);
}
.nav .logo img { width: 30px; height: 30px; border-radius: 6px; }
.nav nav { display: flex; flex-wrap: wrap; gap: 8px 26px; font-size: 13px; color: var(--muted); }
.nav nav a { transition: color .25s cubic-bezier(.22,1,.36,1); }
.nav nav a:hover { color: var(--ink); }
.nav nav a.nav-cta { color: var(--green); }
.nav nav a.nav-cta:hover { color: var(--ink); }

/* ---- hero (top) ---- */
.hero { padding: clamp(64px, 9vw, 110px) var(--pad-x) clamp(56px, 8vw, 90px); max-width: 1200px; }
.coord {
  font-family: var(--font-mono);
  font-size: 12px; color: var(--green);
  letter-spacing: .08em;
  margin-bottom: clamp(20px, 3vw, 30px);
}
.hero h1 {
  font-size: clamp(40px, 8.2vw, 104px);
  font-weight: 800; line-height: 1.16; letter-spacing: .01em;
}
.hero h1 .ghost { color: transparent; -webkit-text-stroke: 1.5px var(--faint); }
@supports not (-webkit-text-stroke: 1px black) {
  .hero h1 .ghost { color: var(--faint); }
}
.hero .lede {
  margin-top: clamp(26px, 4vw, 38px);
  font-size: 15px; line-height: 2.1; color: var(--muted);
  max-width: 36em;
}
.hero .lede b, .hero .lede strong { color: var(--ink); font-weight: 600; }

/* ---- business strip ---- */
.strip {
  display: grid; grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--line);
}
.strip .s {
  display: block;
  padding: 30px 28px 38px var(--pad-x);
  border-right: 1px solid var(--line);
  font-size: 12.5px; line-height: 1.9; color: var(--muted);
  transition: background .25s cubic-bezier(.22,1,.36,1);
}
.strip .s:last-child { border-right: none; }
a.s:hover { background: var(--bg2); }
.strip .no {
  font-family: var(--font-mono);
  font-size: 12px; color: var(--green);
  display: block; margin-bottom: 14px;
}
.strip b { display: block; font-size: 14.5px; color: var(--ink); margin-bottom: 7px; font-weight: 600; }
@media (max-width: 960px) {
  .strip { grid-template-columns: 1fr 1fr; }
  .strip .s { border-bottom: 1px solid var(--line); }
  .strip .s:nth-child(2n) { border-right: none; }
}
@media (max-width: 560px) {
  .strip { grid-template-columns: 1fr; }
  .strip .s { border-right: none; }
}

/* ---- section scaffolding (dark) ---- */
.section { padding: clamp(56px, 8vw, 88px) var(--pad-x); }
.k {
  font-family: var(--font-mono);
  font-size: 12px; color: var(--green);
  letter-spacing: .1em; margin-bottom: 10px;
}
.section h2 { font-size: clamp(26px, 3.6vw, 34px); font-weight: 800; margin-bottom: 12px; }
.section .lead { color: var(--muted); max-width: 38em; }

/* ---- works (paper) ---- */
.works { background: var(--paper); color: var(--paper-ink); padding: clamp(56px, 8vw, 72px) var(--pad-x) clamp(48px, 7vw, 64px); }
.works .k { color: var(--green-deep); }
.works h2 { font-size: clamp(26px, 3.6vw, 34px); font-weight: 800; margin-bottom: 34px; }
.wgrid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 1px;
  background: var(--paper-line); border: 1px solid var(--paper-line);
  max-width: 1100px;
}
.wgrid .w { background: var(--paper); padding: 26px 30px; font-size: 12.5px; line-height: 1.9; color: var(--paper-muted); }
.wgrid .role {
  font-family: var(--font-mono);
  font-size: 11px; color: var(--green-deep);
  display: block; margin-bottom: 10px;
}
.wgrid b { display: block; font-size: 14.5px; color: var(--paper-ink); margin-bottom: 6px; font-weight: 600; }
.works .note { margin-top: 18px; font-size: 11.5px; color: var(--paper-faint); }
@media (max-width: 720px) { .wgrid { grid-template-columns: 1fr; } }

/* ---- harubase feature ---- */
.product { border-top: 1px solid var(--line); }
.product .inner { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(32px, 6vw, 72px); align-items: start; max-width: 1100px; }
.product p { color: var(--muted); font-size: 14px; }
.product p b { color: var(--ink); font-weight: 600; }
.product .spec { list-style: none; padding: 0; margin-top: 6px; font-size: 13px; color: var(--muted); }
.product .spec li { padding: 13px 0; border-bottom: 1px solid var(--line); display: flex; gap: 16px; }
.product .spec li:first-child { border-top: 1px solid var(--line); }
.product .spec .t { font-family: var(--font-mono); font-size: 11px; color: var(--green); flex: 0 0 7.5em; padding-top: 3px; letter-spacing: .04em; }
@media (max-width: 860px) { .product .inner { grid-template-columns: 1fr; } }

/* ---- buttons / links ---- */
.btn {
  display: inline-block;
  font-size: 13px; font-weight: 600;
  padding: 13px 28px;
  border: 1px solid var(--green);
  color: var(--green);
  transition: background .25s cubic-bezier(.22,1,.36,1), color .25s cubic-bezier(.22,1,.36,1);
}
.btn:hover { background: var(--green); color: var(--bg); }
.btn--solid { background: var(--green); color: var(--bg); }
.btn--solid:hover { background: var(--ink); border-color: var(--ink); }
.textlink { color: var(--green); font-size: 13.5px; }
.textlink:hover { color: var(--ink); }
.works a { color: var(--green-deep); }
.works a:hover { text-decoration: underline; }

/* ---- info table (dark) ---- */
.info-table { width: 100%; border-collapse: collapse; max-width: 760px; font-size: 13.5px; }
.info-table th, .info-table td { padding: 15px 4px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
.info-table tr:first-child th, .info-table tr:first-child td { border-top: 1px solid var(--line); }
.info-table th {
  font-family: var(--font-mono); font-weight: 400;
  font-size: 11.5px; letter-spacing: .06em;
  color: var(--green); width: 9.5em; padding-top: 18px;
}
.info-table td { color: var(--muted); }
.info-table td a { color: var(--ink); border-bottom: 1px solid var(--line); }
.info-table td a:hover { border-color: var(--green); }

/* ---- CTA band ---- */
.cta { border-top: 1px solid var(--line); text-align: left; }
.cta h2 { font-size: clamp(26px, 4vw, 40px); font-weight: 800; margin-bottom: 14px; }
.cta p { color: var(--muted); max-width: 36em; margin-bottom: 30px; }

/* ---- footer ---- */
.footer { border-top: 1px solid var(--line); padding: 48px var(--pad-x) 36px; font-size: 12.5px; color: var(--muted); }
.footer .cols { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 32px; max-width: 1100px; }
.footer .brand { display: flex; align-items: center; gap: 10px; font-family: var(--font-mono); font-size: 14px; font-weight: 700; color: var(--ink); margin-bottom: 12px; }
.footer .brand img { width: 26px; height: 26px; border-radius: 5px; }
.footer h5 { font-family: var(--font-mono); font-size: 11px; font-weight: 400; letter-spacing: .1em; color: var(--faint); margin-bottom: 12px; }
.footer ul { list-style: none; padding: 0; }
.footer li { margin-bottom: 8px; }
.footer a:hover { color: var(--ink); }
.footer .bottom {
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px;
  margin-top: 44px; padding-top: 20px;
  border-top: 1px solid var(--line);
  font-size: 11.5px; color: var(--faint);
}
@media (max-width: 760px) { .footer .cols { grid-template-columns: 1fr 1fr; } }

/* ---- sub-page header ---- */
.page-head { padding: clamp(48px, 7vw, 80px) var(--pad-x) clamp(40px, 6vw, 64px); max-width: 1100px; }
.page-head h1 { font-size: clamp(32px, 5vw, 56px); font-weight: 800; line-height: 1.3; }
.page-head .lede { margin-top: 20px; font-size: 14.5px; color: var(--muted); max-width: 36em; }

/* ---- article-ish content (sub pages) ---- */
.content { padding: 0 var(--pad-x) clamp(56px, 8vw, 88px); max-width: 880px; }
.content > section { padding: clamp(40px, 6vw, 56px) 0 0; }
.content h2 { font-size: clamp(22px, 3vw, 28px); font-weight: 800; margin-bottom: 16px; }
.content h3 { font-size: 15.5px; font-weight: 600; margin: 30px 0 10px; }
.content p { color: var(--muted); font-size: 14px; margin-bottom: 14px; max-width: 42em; }
.content ul { color: var(--muted); font-size: 13.5px; }
.content li { margin-bottom: 6px; }
.content li::marker { color: var(--green); }
.content a { color: var(--green); }
.content a:hover { color: var(--ink); }

/* ---- legal (privacy) ---- */
.legal-meta {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(170px, 1fr)); gap: 1px;
  background: var(--line); border: 1px solid var(--line);
  margin-bottom: 40px; max-width: 760px;
}
.legal-meta > div { background: var(--bg); padding: 14px 18px; }
.legal-meta dt { font-family: var(--font-mono); font-size: 11px; color: var(--green); letter-spacing: .06em; margin-bottom: 4px; }
.legal-meta dd { font-size: 13px; color: var(--muted); }
.content .ts { font-size: 12px; color: var(--faint); margin-top: 44px; }

/* ---- contact card ---- */
.contact-block { border: 1px solid var(--line); padding: clamp(24px, 4vw, 40px); max-width: 720px; }
.contact-block + .contact-block { border-top: none; }
.email-link {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: var(--font-mono); font-size: clamp(15px, 2.6vw, 19px);
  color: var(--green); border-bottom: 1px solid var(--line); padding-bottom: 4px;
}
.email-link:hover { border-color: var(--green); }