:root {
  --bg: #0b0e14;
  --bg-2: #11151e;
  --panel: #151a25;
  --line: #232a38;
  --text: #d6deeb;
  --muted: #7d8799;
  --accent: #39d98a;
  --accent-2: #5ccfe6;
  --warn: #ffcc66;
  --pink: #f07178;
  --mono: "JetBrains Mono", ui-monospace, Consolas, monospace;
  --sans: "Noto Sans JP", system-ui, sans-serif;
  --radius: 10px;
  --max: 1040px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; scroll-padding-top: 72px; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  line-height: 1.8;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
::selection { background: var(--accent); color: var(--bg); }

#bg {
  position: fixed; inset: 0;
  width: 100%; height: 100%;
  z-index: -1;
  opacity: .35;
}

.accent { color: var(--accent); }
.num { color: var(--accent); font-family: var(--mono); margin-right: .4em; font-size: .85em; }

/* ---------- nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 10;
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px max(16px, calc((100% - var(--max)) / 2));
  background: color-mix(in srgb, var(--bg) 80%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.brand { font-family: var(--mono); font-weight: 700; font-size: 1.1rem; }
.nav-links { display: flex; gap: 28px; font-family: var(--mono); font-size: .9rem; }
.nav-links a { color: var(--muted); transition: color .2s; }
.nav-links a:hover { color: var(--text); }
.nav-toggle { display: none; background: none; border: 0; cursor: pointer; width: 32px; height: 32px; position: relative; }
.nav-toggle span { position: absolute; left: 6px; right: 6px; height: 2px; background: var(--text); transition: transform .25s, top .25s; }
.nav-toggle span:first-child { top: 11px; }
.nav-toggle span:last-child { top: 19px; }
.nav-toggle[aria-expanded="true"] span:first-child { top: 15px; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:last-child { top: 15px; transform: rotate(-45deg); }

/* ---------- layout ---------- */
main { max-width: var(--max); margin: 0 auto; padding: 0 16px; }
.section { padding: 96px 0 24px; }
.section-title {
  font-family: var(--mono);
  font-size: clamp(1.4rem, 3vw, 1.8rem);
  display: flex; align-items: center; gap: 4px;
  margin-bottom: 36px;
}
.section-title::after {
  content: ""; flex: 1; height: 1px; background: var(--line); margin-left: 20px; max-width: 300px;
}

/* ---------- hero ---------- */
.hero { min-height: calc(100vh - 66px); display: flex; flex-direction: column; justify-content: center; gap: 28px; padding: 48px 0; }
.terminal {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  max-width: 620px;
  box-shadow: 0 20px 60px rgba(0,0,0,.45), 0 0 0 1px rgba(57,217,138,.05);
  overflow: hidden;
}
.terminal-bar { display: flex; align-items: center; gap: 8px; padding: 10px 14px; background: var(--bg-2); border-bottom: 1px solid var(--line); }
.dot { width: 12px; height: 12px; border-radius: 50%; }
.dot.r { background: #ff5f56; } .dot.y { background: #ffbd2e; } .dot.g { background: #27c93f; }
.terminal-title { margin-left: auto; margin-right: auto; font-family: var(--mono); font-size: .78rem; color: var(--muted); transform: translateX(-26px); }
.terminal-body { padding: 22px 24px 26px; font-family: var(--mono); font-size: .95rem; }
.prompt { color: var(--accent); margin-right: .6em; }
.hero-name {
  font-size: clamp(2.8rem, 9vw, 4.6rem);
  line-height: 1.1;
  margin: 6px 0 18px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero-role { color: var(--warn); min-height: 1.8em; }
.caret { color: var(--accent); animation: blink 1s steps(1) infinite; margin-left: 2px; }
@keyframes blink { 50% { opacity: 0; } }
.hero-lead { color: var(--muted); max-width: 560px; }
.hero-cta { display: flex; gap: 14px; flex-wrap: wrap; }
.btn {
  font-family: var(--mono); font-size: .9rem;
  padding: 12px 22px; border-radius: 6px;
  border: 1px solid var(--accent); color: var(--accent);
  transition: background .2s, transform .2s;
}
.btn:hover { background: rgba(57,217,138,.1); transform: translateY(-2px); }
.btn.primary { background: var(--accent); color: var(--bg); font-weight: 700; }
.btn.primary:hover { background: #5ee6a3; }

/* ---------- about ---------- */
.about-grid { display: grid; grid-template-columns: 1.2fr 1fr; gap: 40px; align-items: start; }
.about-text p + p { margin-top: 1em; }
.about-text { color: #b8c2d3; }
.about-code {
  background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 20px 22px; font-family: var(--mono); font-size: .85rem; line-height: 1.7;
  overflow-x: auto;
}
.k { color: #c792ea; } .v { color: var(--accent-2); } .p { color: var(--text); }
.s { color: #c3e88d; } .b { color: #f78c6c; }

/* ---------- skills ---------- */
.skills { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 20px; }
.skill-group { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px 22px; }
.skill-group h3 { font-family: var(--mono); font-size: .9rem; color: var(--accent-2); margin-bottom: 14px; }
.skill-group h3::before { content: "# "; color: var(--muted); }
.skill { display: flex; justify-content: space-between; align-items: center; gap: 12px; padding: 6px 0; font-size: .92rem; }
.bar { font-family: var(--mono); font-size: .8rem; letter-spacing: 1px; color: var(--line); white-space: nowrap; }
.bar .on { color: var(--accent); }

/* ---------- works ---------- */
.filters { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 24px; }
.filter {
  font-family: var(--mono); font-size: .8rem;
  background: none; color: var(--muted);
  border: 1px solid var(--line); border-radius: 999px;
  padding: 6px 14px; cursor: pointer; transition: all .2s;
}
.filter:hover { color: var(--text); border-color: var(--muted); }
.filter.active { color: var(--bg); background: var(--accent); border-color: var(--accent); }
.works { display: grid; grid-template-columns: repeat(auto-fill, minmax(290px, 1fr)); gap: 20px; }
.work {
  position: relative;
  display: flex; flex-direction: column; gap: 12px;
  background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 24px; transition: transform .25s, border-color .25s, box-shadow .25s;
}
.work:hover { transform: translateY(-4px); border-color: rgba(57,217,138,.5); box-shadow: 0 12px 30px rgba(0,0,0,.35); }
.work.hide { display: none; }
.work-head { display: flex; justify-content: space-between; align-items: center; }
.work-icon { color: var(--accent); font-family: var(--mono); font-size: 1.3rem; }
.work-links { display: flex; gap: 14px; font-family: var(--mono); font-size: .8rem; }
.work-links a { color: var(--muted); transition: color .2s; }
.work-links a:hover { color: var(--accent); }
.work h3 { font-size: 1.15rem; }
.work p { color: var(--muted); font-size: .9rem; flex: 1; }
.tags { display: flex; flex-wrap: wrap; gap: 8px 12px; font-family: var(--mono); font-size: .75rem; color: var(--accent-2); }
.work-year { position: absolute; bottom: 20px; right: 22px; font-family: var(--mono); font-size: .75rem; color: var(--muted); }

/* ---------- contact ---------- */
.contact { text-align: center; padding-bottom: 80px; }
.contact .section-title { justify-content: center; }
.contact .section-title::after { display: none; }
.contact-lead { color: var(--muted); margin-bottom: 28px; }
.contact-links { display: flex; justify-content: center; flex-wrap: wrap; gap: 14px; }
.contact-link {
  display: flex; flex-direction: column; align-items: center;
  min-width: 160px; padding: 16px 22px;
  background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius);
  font-family: var(--mono); transition: border-color .2s, transform .2s;
}
.contact-link:hover { border-color: var(--accent); transform: translateY(-3px); }
.contact-link .label { font-size: .75rem; color: var(--muted); }
.contact-link .handle { font-size: .9rem; color: var(--text); }

.footer { text-align: center; padding: 28px 16px; border-top: 1px solid var(--line); font-family: var(--mono); font-size: .75rem; color: var(--muted); }

/* ---------- reveal ---------- */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity .7s ease, transform .7s ease; }
.reveal.visible { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .caret { animation: none; }
}

/* ---------- responsive ---------- */
@media (max-width: 760px) {
  .nav-toggle { display: block; }
  .nav-links {
    position: absolute; top: 100%; left: 0; right: 0;
    flex-direction: column; gap: 0;
    background: var(--bg-2); border-bottom: 1px solid var(--line);
    max-height: 0; overflow: hidden; transition: max-height .3s;
  }
  .nav-links.open { max-height: 260px; }
  .nav-links a { padding: 14px 16px; border-top: 1px solid var(--line); }
  .about-grid { grid-template-columns: 1fr; gap: 24px; }
  .section { padding-top: 72px; }
  .terminal-title { display: none; }
  .terminal-body { padding: 18px; font-size: .88rem; }
}

/* ---------- AI badge ---------- */
.ai-badge {
  margin-left: 10px; vertical-align: middle;
  font-family: var(--mono); font-size: .68rem;
  padding: 2px 8px; border-radius: 999px;
  color: #c792ea; border: 1px solid rgba(199,146,234,.45);
  background: rgba(199,146,234,.08);
}
.ai-note { font-family: var(--sans); font-size: .8rem; margin-bottom: 6px; }
.ai-note .ai-badge { margin: 0 8px 0 0; }

/* ---------- certifications ---------- */
.certs { list-style: none; display: grid; gap: 12px; max-width: 760px; }
.cert {
  display: grid; grid-template-columns: 90px 1fr auto; align-items: center; gap: 18px;
  background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 16px 22px; transition: border-color .2s;
}
.cert:hover { border-color: rgba(57,217,138,.5); }
.cert-date { font-family: var(--mono); font-size: .8rem; color: var(--muted); }
.cert-body { display: flex; flex-direction: column; line-height: 1.5; }
.cert-name { font-weight: 500; }
.cert-issuer { font-size: .8rem; color: var(--muted); }
.cert-check { color: var(--accent); font-family: var(--mono); }
@media (max-width: 760px) {
  .cert { grid-template-columns: 1fr auto; gap: 4px 12px; padding: 14px 16px; }
  .cert-date { grid-column: 1 / -1; }
  .cert-check { grid-row: 2; grid-column: 2; }
}