/* Shared site styles for F2J */
:root {
    --bg: #f8f9fa;
    --card: #ffffff;
    --text-main: #1f2937;
    --text-muted: #6b7280;
    --accent: #2563eb;
    --border: #e5e7eb;
    --max-width: 900px;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
    line-height: 1.75;
    color: var(--text-main);
    background: var(--bg);
}

.page {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 56px 20px 80px;
}

.card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 12px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.06);
    padding: 32px;
}

.back-link {
    display: inline-block;
    margin-bottom: 20px;
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.95rem;
}

.back-link:hover { color: var(--text-main); }

h1 { font-size: 2.2rem; margin: 0 0 12px; letter-spacing: -0.01em; }
h2 { font-size: 1.6rem; margin: 32px 0 16px; }
h3 { font-size: 1.25rem; margin: 28px 0 12px; }
h4 { font-size: 1.1rem; margin: 24px 0 10px; }
p { margin: 0 0 16px; }

ul, ol { margin: 16px 0 16px 28px; }
li { margin: 8px 0; }

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

code {
    background: #f3f4f6;
    padding: 2px 6px;
    border-radius: 4px;
    font-family: 'SF Mono', 'Monaco', 'Consolas', monospace;
    font-size: 0.95em;
}

pre {
    background: #f3f4f6;
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 16px;
    overflow-x: auto;
    margin: 16px 0;
}

pre code {
    background: none;
    padding: 0;
}

blockquote {
    border-left: 4px solid var(--accent);
    background: #f9fafb;
    margin: 16px 0;
    padding: 12px 16px;
    color: var(--text-muted);
    font-style: italic;
}

del {
    text-decoration: line-through;
    color: var(--text-muted);
}

table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
    background: #fff;
}

th, td {
    border: 1px solid var(--border);
    padding: 12px;
    text-align: left;
}

th {
    background: #f5f5f5;
    font-weight: 600;
}

img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    margin: 24px 0;
    display: block;
}

@media (max-width: 640px) {
    .page { padding: 40px 16px 60px; }
    .card { padding: 24px; }
    h1 { font-size: 1.8rem; }
    h2 { font-size: 1.4rem; }
}