:root{
  --bg: #F3F4F1;
  --surface: #FFFFFF;
  --surface-2: #E9EBE6;
  --ink: #14181A;
  --ink-soft: #5B655F;
  --ink-faint: #8B948E;
  --line: #DADDD6;
  --accent: #1F7A6C;
  --accent-ink: #FFFFFF;
  --accent-soft: #E3F0EC;
  --accent2: #A6772E;
  --accent2-soft: #F3E8D6;
  --danger: #B3452F;
  --danger-soft: #F5E4DF;
  --shadow: 0 1px 2px rgba(20,24,26,0.04), 0 8px 24px -12px rgba(20,24,26,0.12);
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --bg: #121615;
    --surface: #1B2120;
    --surface-2: #222927;
    --ink: #ECEEEA;
    --ink-soft: #9BA59D;
    --ink-faint: #6D7671;
    --line: #2B3230;
    --accent: #56D9BE;
    --accent-ink: #0A1A17;
    --accent-soft: #17302A;
    --accent2: #E5B36B;
    --accent2-soft: #2E2617;
    --danger: #E0876D;
    --danger-soft: #34211B;
    --shadow: 0 1px 2px rgba(0,0,0,0.3), 0 8px 24px -12px rgba(0,0,0,0.5);
  }
}
:root[data-theme="dark"]{
  --bg: #121615;
  --surface: #1B2120;
  --surface-2: #222927;
  --ink: #ECEEEA;
  --ink-soft: #9BA59D;
  --ink-faint: #6D7671;
  --line: #2B3230;
  --accent: #56D9BE;
  --accent-ink: #0A1A17;
  --accent-soft: #17302A;
  --accent2: #E5B36B;
  --accent2-soft: #2E2617;
  --danger: #E0876D;
  --danger-soft: #34211B;
  --shadow: 0 1px 2px rgba(0,0,0,0.3), 0 8px 24px -12px rgba(0,0,0,0.5);
}

*{ box-sizing:border-box; }
html{ scroll-behavior:smooth; }
body{
  margin:0;
  padding:0;
  background:var(--bg);
  color:var(--ink);
  font-family:"Zen Kaku Gothic New", "Hiragino Kaku Gothic ProN", "Yu Gothic", sans-serif;
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
  background-image: radial-gradient(var(--line) 1px, transparent 1px);
  background-size: 22px 22px;
  background-attachment: fixed;
}
.mono{ font-family:"JetBrains Mono", ui-monospace, monospace; font-variant-numeric:tabular-nums; }

a{ color:inherit; }
h1,h2,h3{ text-wrap:balance; margin:0; }

.wrap{ max-width: 980px; margin:0 auto; padding-inline: 20px; }

[data-lang="ja"] .en{ display:none; }
[data-lang="en"] .ja{ display:none; }

header{
  position: sticky; top:0; z-index:20;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.nav-row{ display:flex; align-items:center; justify-content:space-between; padding-block:14px; gap:16px; flex-wrap:wrap; }
.brand{ display:flex; align-items:center; gap:8px; font-weight:900; font-size:1.05rem; letter-spacing:0.01em; text-decoration:none; }
.brand .dot{ width:8px; height:8px; border-radius:50%; background:var(--accent); box-shadow:0 0 0 3px var(--accent-soft); }
nav{ display:flex; align-items:center; gap:22px; flex-wrap:wrap; }
nav a{ text-decoration:none; color:var(--ink-soft); font-size:0.92rem; }
nav a:hover{ color:var(--ink); }
.lang-btn{
  font-family:"JetBrains Mono", monospace; font-size:0.78rem; letter-spacing:0.03em;
  border:1px solid var(--line); background:var(--surface); color:var(--ink-soft);
  border-radius:999px; padding:6px 12px; cursor:pointer;
}
.lang-btn:hover{ color:var(--ink); border-color: var(--ink-faint); }
.lang-btn:focus-visible, a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible{
  outline: 2px solid var(--accent); outline-offset: 2px;
}

.hero{ padding-block: 64px 56px; }
.hero-grid{ display:grid; grid-template-columns: 1.1fr 0.9fr; gap:40px; align-items:center; }
.eyebrow{
  display:inline-flex; align-items:center; gap:8px;
  font-family:"JetBrains Mono", monospace; font-size:0.76rem; letter-spacing:0.08em;
  color:var(--accent); text-transform:uppercase; margin-bottom:14px;
}
.eyebrow::before{ content:"//"; color:var(--ink-faint); }
.hero h1{ font-size: clamp(2.1rem, 5vw, 3.1rem); font-weight:900; letter-spacing:-0.01em; }
.hero p.lead{ color:var(--ink-soft); font-size:1.05rem; max-width:46ch; margin-top:16px; }
.cta-row{ display:flex; gap:12px; margin-top:28px; flex-wrap:wrap; }
.btn{
  display:inline-flex; align-items:center; gap:8px;
  padding:11px 20px; border-radius:8px; font-weight:700; font-size:0.92rem;
  text-decoration:none; border:1px solid transparent; cursor:pointer;
}
.btn-primary{ background:var(--accent); color:var(--accent-ink); }
.btn-primary:hover{ filter:brightness(1.06); }
.btn-primary:disabled{ opacity:0.6; cursor:not-allowed; }
.btn-ghost{ background:transparent; color:var(--ink); border-color:var(--line); }
.btn-ghost:hover{ border-color:var(--ink-faint); }

.mesh{ width:100%; height:auto; }
.mesh circle{ fill: var(--surface); stroke: var(--ink-faint); stroke-width:1.4; }
.mesh circle.node-accent{ fill: var(--accent-soft); stroke: var(--accent); }
.mesh line{ stroke: var(--line); stroke-width:1.4; }
.mesh line.live{ stroke: var(--accent); stroke-width:1.6; }
.mesh .pulse{ fill:var(--accent); }

section{ padding-block: 52px; border-top:1px solid var(--line); }
.section-head{ display:flex; align-items:baseline; justify-content:space-between; gap:16px; margin-bottom:30px; flex-wrap:wrap; }
.section-head h2{ font-size:1.5rem; font-weight:900; }
.section-note{ font-family:"JetBrains Mono", monospace; font-size:0.72rem; color:var(--ink-faint); letter-spacing:0.02em; }

.app-grid{ display:grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap:18px; }
.card{
  background:var(--surface); border:1px solid var(--line); border-radius:12px;
  padding:22px; box-shadow:var(--shadow);
  display:flex; flex-direction:column; gap:14px;
}
.card-top{ display:flex; align-items:flex-start; justify-content:space-between; gap:10px; }
.app-icon{ width:38px; height:38px; border-radius:9px; background:var(--accent-soft); color:var(--accent); display:flex; align-items:center; justify-content:center; flex:none; }
.badge{
  font-family:"JetBrains Mono", monospace; font-size:0.68rem; letter-spacing:0.03em;
  padding:4px 9px; border-radius:999px; white-space:nowrap; font-weight:600;
}
.badge-dev{ background:var(--accent-soft); color:var(--accent); }
.badge-soon{ background:var(--accent2-soft); color:var(--accent2); }
.card h3{ font-size:1.12rem; font-weight:700; }
.card p{ color:var(--ink-soft); font-size:0.92rem; margin:0; }
.tag-row{ display:flex; gap:6px; flex-wrap:wrap; }
.tag{
  font-family:"JetBrains Mono", monospace; font-size:0.7rem; color:var(--ink-soft);
  border:1px solid var(--line); border-radius:6px; padding:3px 7px;
}
.card-link{ margin-top:auto; font-size:0.86rem; font-weight:700; color:var(--accent); text-decoration:none; }
.card-ghost{
  border-style:dashed; align-items:center; justify-content:center; text-align:center;
  color:var(--ink-faint); box-shadow:none; gap:8px;
}
.card-ghost .app-icon{ background:transparent; border:1px dashed var(--line); color:var(--ink-faint); }

.log-list{ display:flex; flex-direction:column; }
.log-item{
  display:grid; grid-template-columns: 132px 1fr; gap:18px;
  padding-block:14px; border-top:1px solid var(--line);
}
.log-item:first-child{ border-top:none; }
.log-date{ font-family:"JetBrains Mono", monospace; font-size:0.8rem; color:var(--ink-faint); padding-top:2px; }
.log-text{ font-size:0.95rem; }
.log-text .en{ color:var(--ink-soft); font-size:0.86rem; display:block; margin-top:2px; }

.profile-row{ display:flex; gap:26px; align-items:flex-start; flex-wrap:wrap; }
.avatar{
  width:76px; height:76px; border-radius:16px; background:var(--accent); color:var(--accent-ink);
  display:flex; align-items:center; justify-content:center; font-weight:900; font-size:1.6rem; flex:none;
}
.profile-body{ flex:1; min-width:240px; }
.profile-body h3{ font-size:1.2rem; font-weight:700; margin-bottom:6px; }
.profile-body p{ color:var(--ink-soft); margin:0 0 14px; max-width:60ch; }
.placeholder-tip{
  font-family:"JetBrains Mono", monospace; font-size:0.72rem; color:var(--ink-faint);
  border:1px dashed var(--line); border-radius:8px; padding:8px 12px; display:inline-block;
}
.link-row{ display:flex; gap:14px; margin-top:14px; flex-wrap:wrap; }
.link-row a{ display:inline-flex; align-items:center; gap:6px; text-decoration:none; color:var(--ink-soft); font-size:0.88rem; border:1px solid var(--line); padding:7px 12px; border-radius:8px; }
.link-row a:hover{ color:var(--ink); border-color:var(--ink-faint); }

form{ display:flex; flex-direction:column; gap:14px; max-width:520px; }
.field{ display:flex; flex-direction:column; gap:6px; }
label{ font-size:0.82rem; color:var(--ink-soft); font-weight:500; }
input, textarea{
  font-family:inherit; font-size:0.95rem; color:var(--ink);
  background:var(--surface); border:1px solid var(--line); border-radius:8px;
  padding:11px 12px; resize:vertical;
}
input:focus, textarea:focus{ border-color:var(--accent); }
textarea{ min-height:110px; }
.form-note{ font-size:0.78rem; color:var(--ink-faint); min-height:1.2em; }
.form-note.is-success{ color:var(--accent); }
.form-note.is-error{ color:var(--danger); }

footer{ border-top:1px solid var(--line); padding-block:26px; }
.foot-row{ display:flex; justify-content:space-between; align-items:center; gap:12px; flex-wrap:wrap; color:var(--ink-faint); font-size:0.82rem; }
.foot-row .mono{ font-size:0.76rem; }

@media (max-width: 760px){
  .hero-grid{ grid-template-columns:1fr; }
  .hero{ padding-block:44px 36px; }
  nav{ order:3; width:100%; justify-content:flex-start; gap:16px; }
  .log-item{ grid-template-columns: 1fr; gap:4px; }
}