:root{
  --bg:#ffffff;
  --text:#0b1220;
  --muted:#5f6b7a;
  --card:#ffffff;
  --border:#e6e9ef;
  --soft:#f6f8fb;
  --accent:#111827;
  --accent2:#0f172a;
  --ok:#0f766e;
  --warn:#b45309;
  --radius:16px;
  --shadow: 0 8px 28px rgba(15, 23, 42, .06);
}

*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  background:var(--bg);
  color:var(--text);
  line-height:1.55;
}

a{color:inherit}
.container{max-width:980px;margin:0 auto;padding:22px}
.header{
  display:flex;align-items:center;justify-content:space-between;gap:12px;
  padding:10px 0 18px;
}
.brand{
  display:flex;align-items:center;gap:10px;text-decoration:none;
}
.logo{
  width:38px;height:38px;border-radius:12px;
  background:var(--accent);
  display:grid;place-items:center;
  color:white;font-weight:800;
  box-shadow: var(--shadow);
}
.brand-title{font-weight:900;letter-spacing:-.02em}
.nav{display:flex;gap:14px;flex-wrap:wrap}
.nav a{color:var(--muted);text-decoration:none;font-weight:650}
.nav a:hover{color:var(--text)}

.hero{
  background:linear-gradient(180deg,var(--soft),transparent);
  border:1px solid var(--border);
  border-radius: calc(var(--radius) + 4px);
  padding:20px 18px;
  box-shadow: var(--shadow);
}
.hero h1{margin:0 0 6px;font-size:34px;letter-spacing:-.03em}
.hero p{margin:0;color:var(--muted);max-width:68ch}
.pills{display:flex;gap:8px;flex-wrap:wrap;margin-top:12px}
.pill{
  border:1px solid var(--border);
  background:#fff;
  border-radius:999px;
  padding:6px 10px;
  font-size:12px;
  color:#334155;
}

.grid{display:grid;grid-template-columns:1fr;gap:14px;margin-top:14px}
@media (min-width:880px){.grid{grid-template-columns:1fr 1fr 1fr}}

.card{
  background:var(--card);
  border:1px solid var(--border);
  border-radius: var(--radius);
  padding:16px;
  box-shadow: var(--shadow);
}
.card h2{margin:0 0 6px;font-size:18px;letter-spacing:-.01em}
.card p{margin:0;color:var(--muted);font-size:14px}
.card .actions{margin-top:12px;display:flex;gap:10px;flex-wrap:wrap}

.btn{
  display:inline-flex;align-items:center;justify-content:center;
  padding:10px 14px;border-radius:12px;
  border:1px solid var(--accent);
  background:var(--accent);
  color:white;
  text-decoration:none;font-weight:800;
}
.btn.secondary{
  background:#fff;color:var(--accent);
}
.btn:hover{filter:brightness(.97)}

.section{margin-top:14px}
.section h2{margin:0 0 8px;font-size:20px;letter-spacing:-.02em}
.muted{color:var(--muted);font-size:14px}

.notice{
  background:#fff;
  border:1px solid var(--border);
  border-radius: var(--radius);
  padding:14px 14px;
}
.notice strong{display:block;margin-bottom:6px}
.notice.ok{border-color:rgba(15,118,110,.25); background:rgba(15,118,110,.04)}
.notice.warn{border-color:rgba(180,83,9,.25); background:rgba(180,83,9,.04)}

.tabs{
  display:flex;gap:8px;flex-wrap:wrap;
  padding:10px;border-radius: var(--radius);
  background:var(--soft);
  border:1px solid var(--border);
}
.tab-btn{
  border:1px solid var(--border);
  background:#fff;
  border-radius:999px;
  padding:8px 12px;
  font-weight:800;
  color:#1f2937;
  cursor:pointer;
}
.tab-btn[aria-selected="true"]{
  background:var(--accent);
  border-color:var(--accent);
  color:#fff;
}
.tab-panel{display:none}
.tab-panel.active{display:block}

.form{
  display:grid;grid-template-columns:1fr;gap:12px;margin-top:12px
}
@media (min-width:720px){.form.two{grid-template-columns:1fr 1fr}}
label{display:block;font-weight:800;margin:0 0 6px}
input,select,textarea{
  width:100%;padding:10px 10px;border-radius:12px;
  border:1px solid #d8dee7;background:#fff;
  font-size:15px;
}
.small{font-size:12px;color:var(--muted);margin-top:6px}
.inline{display:flex;gap:10px;align-items:center;flex-wrap:wrap}
.result{
  font-size:18px;font-weight:900;letter-spacing:-.01em;
}
.kv{
  display:grid;grid-template-columns:1fr;gap:8px;margin-top:10px
}
@media (min-width:720px){.kv{grid-template-columns:1fr 1fr}}
.kv .item{border:1px solid var(--border);border-radius:14px;padding:12px;background:#fff}
.kv .item .k{font-size:12px;color:var(--muted);font-weight:800}
.kv .item .v{font-size:18px;font-weight:900;margin-top:6px}

.table{
  width:100%;border-collapse:separate;border-spacing:0 10px;margin-top:10px
}
.table th{font-size:12px;color:var(--muted);text-align:left;padding:0 10px}
.table td{
  background:#fff;border:1px solid var(--border);
  padding:10px;border-left:none;border-right:none
}
.table tr td:first-child{border-left:1px solid var(--border);border-top-left-radius:12px;border-bottom-left-radius:12px}
.table tr td:last-child{border-right:1px solid var(--border);border-top-right-radius:12px;border-bottom-right-radius:12px}

.canvas-wrap{
  border:1px solid var(--border);
  border-radius: var(--radius);
  overflow:hidden;
  background:#fff;
}
canvas{display:block;width:100%;height:280px}
.footer{margin:20px 0 6px;color:var(--muted);font-size:13px}
.hr{height:1px;background:var(--border);margin:14px 0}

details{border:1px solid var(--border);border-radius:14px;padding:10px 12px;background:#fff;margin:10px 0}
details summary{font-weight:900;cursor:pointer}
details p{margin:8px 0 0;color:var(--muted);font-size:14px}

.badge{
  display:inline-flex;align-items:center;gap:8px;
  border:1px solid var(--border);border-radius:999px;
  padding:6px 10px;background:#fff;color:#334155;
  font-size:12px;font-weight:800;
}