/* n10u profile — slate x gold */
:root {
  --bg: #f7f5ef;
  --ink: #26303a;
  --slate: #3d4a57;
  --slate-soft: #66727e;
  --gold: #b08d3e;
  --gold-soft: #d3b878;
  --line: #e0dcd0;
  --card: #fffdf8;
  --serif: "Cormorant Garamond", "Times New Roman", serif;
  --sans: "Noto Sans JP", -apple-system, "Helvetica Neue", Arial, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

.wrap { max-width: 880px; margin: 0 auto; padding: 0 24px; }

a { color: var(--slate); text-decoration-color: var(--gold-soft); text-underline-offset: 3px; }
a:hover { color: var(--gold); }

/* header */
header.site {
  display: flex; justify-content: space-between; align-items: center;
  padding: 28px 0;
}
.brand { font-family: var(--mono); font-size: 1.05rem; font-weight: 700; letter-spacing: 0.02em; color: var(--ink); text-decoration: none; }
.brand .tld { color: var(--gold); }
nav.top { display: flex; gap: 20px; align-items: center; font-size: 0.9rem; }
nav.top a { text-decoration: none; color: var(--slate-soft); }
nav.top a:hover { color: var(--gold); }
nav.top .lang { font-family: var(--mono); font-size: 0.8rem; border: 1px solid var(--line); padding: 3px 10px; border-radius: 999px; }

/* hero */
.hero { padding: 72px 0 64px; border-bottom: 1px solid var(--line); }
.eyebrow {
  font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.22em;
  text-transform: uppercase; color: var(--gold); margin-bottom: 20px;
}
h1 {
  font-family: var(--serif); font-weight: 600;
  font-size: clamp(2.1rem, 5.4vw, 3.4rem);
  line-height: 1.18; letter-spacing: 0.005em; color: var(--ink);
}
h1 em { font-style: italic; color: var(--slate); }
.hero p.lede { margin-top: 26px; max-width: 620px; color: var(--slate); font-size: 1.02rem; }
.hero .handle { margin-top: 18px; font-family: var(--mono); font-size: 0.82rem; color: var(--slate-soft); }
.hero .handle a { color: var(--slate-soft); }
.hero .handle a:hover { color: var(--gold); }

/* sections */
section { padding: 56px 0; border-bottom: 1px solid var(--line); }
section:last-of-type { border-bottom: none; }
h2 {
  font-family: var(--serif); font-weight: 600; font-size: 1.7rem; margin-bottom: 8px;
}
.section-note { color: var(--slate-soft); font-size: 0.92rem; margin-bottom: 32px; }

/* activity cards */
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 18px; }
.card {
  background: var(--card); border: 1px solid var(--line); border-radius: 10px;
  padding: 24px 22px; display: flex; flex-direction: column; gap: 10px;
}
.card .k {
  font-family: var(--mono); font-size: 0.68rem; letter-spacing: 0.18em;
  text-transform: uppercase; color: var(--gold);
}
.card h3 { font-family: var(--serif); font-size: 1.22rem; font-weight: 600; line-height: 1.3; }
.card p { font-size: 0.9rem; color: var(--slate); flex: 1; }
.card .links { display: flex; flex-wrap: wrap; gap: 8px 16px; font-size: 0.84rem; }
.card .links a { font-family: var(--mono); font-size: 0.78rem; text-decoration: none; border-bottom: 1px solid var(--gold-soft); }

/* proof list */
.proof { list-style: none; }
.proof li {
  display: grid; grid-template-columns: 170px 1fr; gap: 18px;
  padding: 16px 0; border-bottom: 1px dashed var(--line);
}
.proof li:last-child { border-bottom: none; }
.proof .tag { font-family: var(--mono); font-size: 0.76rem; color: var(--gold); letter-spacing: 0.06em; padding-top: 3px; }
.proof .body { font-size: 0.94rem; color: var(--slate); }
.proof .body a { white-space: nowrap; }

/* contact */
.contact-list { display: flex; flex-wrap: wrap; gap: 12px 14px; margin-top: 10px; }
.contact-list a {
  font-family: var(--mono); font-size: 0.82rem; text-decoration: none;
  border: 1px solid var(--line); background: var(--card);
  padding: 9px 16px; border-radius: 999px; color: var(--slate);
}
.contact-list a:hover { border-color: var(--gold); color: var(--gold); }

/* footer */
footer.site {
  padding: 36px 0 48px; color: var(--slate-soft); font-size: 0.8rem;
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px;
}
footer.site a { color: var(--slate-soft); }

@media (max-width: 560px) {
  .proof li { grid-template-columns: 1fr; gap: 4px; }
  .hero { padding: 52px 0 48px; }
  section { padding: 44px 0; }
}