/* ============ Base (mobile-first) ============ */
:root {
  --bg: #0b1220;
  --bg-alt: #0e172a;
  --text: #e6e9f2;
  --muted: #a5b0c2;
  --brand: #4da3ff;
  --brand-2: #7c5cff;
  --card: #111a2e;
  --border: #203051;
  --shadow: 0 10px 30px rgba(0,0,0,.25);
}
:root.light {
  --bg: #f8fafc;
  --bg-alt: #ffffff;
  --text: #0f172a;
  --muted: #51607a;
  --brand: #3b82f6;
  --brand-2: #8b5cf6;
  --card: #ffffff;
  --border: #e5e7eb;
  --shadow: 0 12px 24px rgba(0,0,0,.08);
}
* { box-sizing: border-box; }
html, body { height: 100%; scroll-behavior: smooth; }
:target { scroll-margin-top: 80px; }
body {
  margin: 0;
  -webkit-tap-highlight-color: transparent;
  font-family: 'Inter', 'Noto Sans JP', system-ui, -apple-system, "Segoe UI", Roboto, "Hiragino Kaku Gothic ProN", "Meiryo", sans-serif;
  background: radial-gradient(1200px 600px at 90% -10%, rgba(77,163,255,.12), transparent 60%),
              radial-gradient(900px 500px at -10% 110%, rgba(124,92,255,.10), transparent 60%),
              var(--bg);
  color: var(--text);
  line-height: 1.7;
  font-size: 16px;
}
img { max-width: 100%; display: block; }
a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }
.container { width: min(1100px, 92vw); padding-left: 16px; padding-right: 16px; margin: 0 auto; }

.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(15,23,42,.6);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
:root.light .site-header { background: rgba(255,255,255,.75); }
.nav { display: flex; align-items: center; justify-content: space-between; padding: 12px 0; gap: 10px; flex-wrap: wrap; }
.brand { font-weight: 700; letter-spacing: .3px; color: var(--text); font-size: 18px; }
nav ul { display: flex; gap: 12px; list-style: none; margin: 0; padding: 0; flex-wrap: wrap; }
nav a { color: var(--text); opacity: .92; padding: 10px 12px; border-radius: 10px; display: inline-block; }
nav a:hover { background: var(--card); text-decoration: none; }

.section { padding: 56px 0; }
.section.alt { background: linear-gradient(180deg, var(--bg-alt), transparent 120%); }
.section-title { font-size: clamp(22px, 6vw, 32px); margin: 0 0 8px; letter-spacing: .3px; }
.section-sub { margin: 0 0 24px; color: var(--muted); }

.hero .hero-inner { display: grid; grid-template-columns: 1fr; gap: 20px; align-items: center; }
.hero .badge { display: inline-block; padding: 6px 10px; border-radius: 999px; background: rgba(77,163,255,.15); color: var(--brand); font-size: 12px; letter-spacing: .5px; }
.hero h1 { margin: 10px 0 6px; font-size: clamp(26px, 8vw, 42px); }
.hero .accent { background: linear-gradient(135deg, var(--brand), var(--brand-2)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.lead { color: var(--muted); margin: 0 0 16px; }
.hero-cta { display: flex; gap: 10px; flex-wrap: wrap; }
.hero-art { position: relative; height: 200px; }
.hero-art .blob {
  position: absolute; inset: 0;
  border-radius: 24px;
  background: radial-gradient(120px 120px at 30% 30%, rgba(77,163,255,.35), transparent 60%),
              radial-gradient(150px 150px at 70% 70%, rgba(124,92,255,.35), transparent 60%),
              linear-gradient(135deg, rgba(255,255,255,.06), rgba(255,255,255,.02));
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}

.btn { appearance:none; border:none; border-radius: 14px; padding: 12px 18px; cursor:pointer; font-weight: 600; }
.btn.primary { background: linear-gradient(135deg, var(--brand), var(--brand-2)); color: white; }
.btn.ghost { background: transparent; border: 1px solid var(--border); color: var(--text); }
.btn.tiny { padding: 10px 12px; font-size: 12px; }
.center { text-align: center; }

.grid { display: grid; grid-template-columns: 1fr; gap: 14px; }
@media (min-width: 480px) { .grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 900px) { .grid { grid-template-columns: repeat(3, 1fr); } }

.card { background: var(--card); border: 1px solid var(--border); border-radius: 18px; padding: 16px;
  box-shadow: var(--shadow); transition: transform .2s ease, box-shadow .2s ease; }
.card:hover { transform: translateY(-2px); }
.card .meta { color: var(--muted); font-size: 12px; margin-top: 6px; }

.list { display: grid; gap: 12px; }
.post { background: var(--card); border: 1px solid var(--border); border-radius: 16px; padding: 16px; }
.post h3 { margin: 0 0 6px; font-size: 18px; }
.post .meta { color: var(--muted); font-size: 12px; }

.about-wrap { display: grid; grid-template-columns: 96px 1fr; gap: 16px; align-items: center; }
.avatar { border-radius: 18px; border: 1px solid var(--border); background: var(--card); width: 96px; height: 96px; }

.contact { display: grid; gap: 12px; }
.contact .row { display: grid; grid-template-columns: 1fr; gap: 12px; }
@media (min-width: 900px) { .contact .row { grid-template-columns: 1fr 1fr; } }
.contact input, .contact textarea { width: 100%; background: var(--bg); color: var(--text); border: 1px solid var(--border);
  padding: 12px 14px; border-radius: 12px; outline: none; }
:root.light .contact input, :root.light .contact textarea { background: #fff; }
.contact input:focus, .contact textarea:focus { border-color: var(--brand); box-shadow: 0 0 0 3px rgba(77,163,255,.2); }

.site-footer { border-top: 1px solid var(--border); padding: 20px 0; }
.foot { display: flex; justify-content: space-between; align-items: center; gap: 8px; flex-wrap: wrap; }

@media (min-width: 900px) {
  .section { padding: 72px 0; }
  .hero .hero-inner { grid-template-columns: 1.3fr 1fr; gap: 28px; }
  .hero-art { height: 260px; }
  .about-wrap { grid-template-columns: 128px 1fr; gap: 18px; }
  .avatar { width: 128px; height: 128px; }
}