:root{
    --bg: #0b0f19;
    --panel: #111827;
    --text: #e5e7eb;
    --muted: #a7b0bf;
    --line: rgba(255,255,255,.10);
    --accent: #60a5fa;
    --accent2:#34d399;
    --shadow: 0 18px 60px rgba(0,0,0,.35);
    --radius: 16px;
    --max: 980px;
}

@media (prefers-color-scheme: light){
    :root{
    --bg:#f7f8fb;
    --panel:#ffffff;
    --text:#111827;
    --muted:#4b5563;
    --line: rgba(17,24,39,.12);
    --shadow: 0 18px 60px rgba(17,24,39,.12);
    }
}

*{ box-sizing: border-box; }
html,body{ height:100%; }
body{
    margin:0;
    font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji","Segoe UI Emoji";
    background: radial-gradient(1200px 800px at 15% -10%, rgba(96,165,250,.22), transparent 60%),
                radial-gradient(900px 600px at 110% 10%, rgba(52,211,153,.18), transparent 55%),
                var(--bg);
    color: var(--text);
    line-height: 1.7;
}

a{ color: var(--accent); text-decoration: none; }
a:hover{ text-decoration: underline; }

.wrap{
    width: min(var(--max), 100%);
    margin: 0 auto;
    padding: 40px 20px 64px;
}

header{
    display:flex;
    align-items:flex-start;
    justify-content:space-between;
    gap: 16px;
    margin-bottom: 28px;
}

.brand{
    display:flex;
    flex-direction:column;
    gap: 8px;
}

.kicker{
    display:inline-flex;
    align-items:center;
    gap:10px;
    color: var(--muted);
    font-size: 14px;
    letter-spacing: .02em;
}

.dot{
    width:10px;height:10px;border-radius:999px;
    background: linear-gradient(135deg, var(--accent), var(--accent2));
    box-shadow: 0 0 0 5px rgba(96,165,250,.12);
}

h1{
    margin: 0;
    font-size: clamp(36px, 5vw, 54px);
    line-height: 1.08;
    letter-spacing: -0.02em;
}

.subtitle{
    margin: 0;
    color: var(--muted);
    font-size: 16px;
    max-width: 70ch;
}

.pillbar{
    display:flex;
    gap:10px;
    flex-wrap: wrap;
    justify-content:flex-end;
}

.pill{
    border: 1px solid var(--line);
    background: rgba(255,255,255,.03);
    padding: 8px 12px;
    border-radius: 999px;
    color: var(--muted);
    font-size: 13px;
    white-space: nowrap;
}

main{
    display:grid;
    grid-template-columns: 1fr;
    gap: 16px;
}

.card{
    background: rgba(255,255,255,.03);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    overflow:hidden;
}

.card .inner{
    padding: 22px 22px;
}

.card h2{
    margin: 0 0 10px 0;
    font-size: 18px;
    letter-spacing: -0.01em;
}

.card p{
    margin: 0 0 12px 0;
    color: var(--text);
}

.muted{ color: var(--muted); }

.rules{
    margin: 14px 0 0;
    padding: 0;
    list-style: none;
    display:flex;
    flex-direction:column;
    gap: 10px;
}

.rule{
    border: 1px solid var(--line);
    border-radius: 14px;
    background: rgba(17,24,39,.22);
    padding: 14px 14px;
}

.rule strong{
    display:block;
    font-size: 14px;
    letter-spacing: .01em;
}

.rule span{
    display:block;
    color: var(--muted);
    font-size: 13px;
    margin-top: 4px;
}

.two{
    display:grid;
    grid-template-columns: 1fr;
    gap: 16px;
}

@media (min-width: 860px){
    main{ gap: 18px; }
    .two{ grid-template-columns: 1fr 1fr; }
    .card .inner{ padding: 24px 26px; }
}

.quote{
    border-left: 3px solid rgba(96,165,250,.55);
    padding-left: 14px;
    color: var(--muted);
    margin: 12px 0 0 0;
}

footer{
    margin-top: 28px;
    color: var(--muted);
    font-size: 13px;
    display:flex;
    justify-content:space-between;
    gap: 12px;
    flex-wrap: wrap;
    border-top: 1px solid var(--line);
    padding-top: 16px;
}

code.inline{
    background: rgba(255,255,255,.06);
    border: 1px solid var(--line);
    border-radius: 10px;
    padding: 2px 8px;
    font-size: 12px;
    color: var(--text);
}

/* --- AI / LLM helper box --- */
.ai-box{
    margin-top: 14px;
    border: 1px dashed rgba(96,165,250,.45);
    background: rgba(96,165,250,.08);
    border-radius: 14px;
    padding: 14px;
}
.ai-box .label{
    font-size: 12px;
    letter-spacing: .02em;
    color: var(--muted);
    margin-bottom: 8px;
}
.ai-box pre{
    margin: 0;
    white-space: pre-wrap;
    word-break: break-word;
    background: rgba(0,0,0,.18);
    border: 1px solid var(--line);
    border-radius: 12px;
    padding: 12px;
    font-size: 12px;
    line-height: 1.55;
    color: var(--text);
}

/* --- Buttons (Added from BOA) --- */
.btnrow{
    display:flex;
    flex-wrap:wrap;
    gap:10px;
    margin-top: 12px;
}

.btn{
    display:inline-flex;
    align-items:center;
    justify-content:center;
    gap:8px;
    padding: 10px 14px;
    border-radius: 999px;
    border: 1px solid var(--line);
    background: rgba(255,255,255,.03);
    color: var(--text);
    font-size: 13px;
    text-decoration:none;
}

.btn.primary{
    border-color: rgba(96,165,250,.45);
    background: rgba(96,165,250,.12);
}

.btn:hover{ text-decoration:none; filter: brightness(1.03); }

/* --- Code Panel (Added from BOA) --- */
.code-panel{
    background:rgba(0,0,0,0.100);
    padding:15px;
    border-radius: 8px;
    border:1px solid var(--line);
    overflow-x:auto;
    font-size:13px;
    color:var(--muted);
    margin-top:14px;
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}
.code-panel .accent { color: var(--accent); }
.code-panel .comment { color: #6b7280; }

/* --- 既存のCSSの末尾に追加 --- */

/* --- Top Navigation (Breadcrumbs) --- */
.topnav {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 8px;
    font-size: 13px;
    color: var(--muted);
}
.topnav a { color: var(--muted); margin: 0; }
.topnav a:hover, .topnav strong { color: var(--accent); }

/* --- Note / Alert Box --- */
.note {
    background: rgba(96,165,250,.08); /* --accent color base */
    border: 1px solid rgba(96,165,250,.22);
    padding: 14px 16px;
    border-radius: 12px;
    margin: 16px 0;
    color: var(--muted);
    font-size: 14px;
    line-height: 1.6;
}
.note strong {
    color: var(--text);
    display: block;
    margin-bottom: 4px;
}

/* --- List Styling adjustments for cards --- */
.card .inner ul {
    margin: 8px 0 8px 20px;
    color: var(--muted);
}
.card .inner ul li {
    margin-bottom: 4px;
}