:root {
   --text: #1d1d1f;
   --text-secondary: #6e6e73;
   --bg: #ffffff;
   --bg-alt: #f5f5f7;
   --accent: #0071e3;
   --border: #d2d2d7;
   --code-bg: #f6f8fa;
   --code-border: #d0d7de;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
   font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text",
                "Hiragino Kaku Gothic ProN", "Hiragino Sans", Meiryo, sans-serif;
   color: var(--text);
   line-height: 1.7;
   background: var(--bg);
   -webkit-font-smoothing: antialiased;
}

.container {
   max-width: 820px;
   margin: 0 auto;
   padding: 48px 24px 80px;
}

.breadcrumb {
   margin-bottom: 24px;
   font-size: 0.9rem;
}

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

a:hover {
   text-decoration: underline;
}

h1 {
   font-size: 2.25rem;
   font-weight: 700;
   letter-spacing: -0.01em;
   margin-bottom: 8px;
}

h2 {
   font-size: 1.5rem;
   font-weight: 600;
   margin-top: 40px;
   margin-bottom: 12px;
   padding-bottom: 6px;
   border-bottom: 1px solid var(--border);
}

h3 {
   font-size: 1.15rem;
   font-weight: 600;
   margin-top: 24px;
   margin-bottom: 8px;
}

p {
   margin-bottom: 12px;
   color: var(--text);
}

p.lead {
   color: var(--text-secondary);
   font-size: 1.05rem;
   margin-bottom: 32px;
}

ul {
   margin-left: 24px;
   margin-bottom: 16px;
}

li {
   margin-bottom: 6px;
}

hr {
   margin: 32px 0;
   border: none;
   border-top: 1px solid var(--border);
}

code {
   background: var(--code-bg);
   border: 1px solid var(--code-border);
   border-radius: 4px;
   padding: 1px 6px;
   font-family: "SF Mono", Menlo, Consolas, monospace;
   font-size: 0.9em;
}

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

pre code {
   background: transparent;
   border: none;
   padding: 0;
   font-size: 0.85rem;
   line-height: 1.5;
}

table {
   width: 100%;
   border-collapse: collapse;
   margin: 16px 0;
   font-size: 0.95rem;
}

th, td {
   text-align: left;
   padding: 8px 12px;
   border-bottom: 1px solid var(--border);
}

th {
   background: var(--bg-alt);
   font-weight: 600;
}

strong {
   font-weight: 600;
}

/* Index page */
.doc-list {
   display: grid;
   gap: 16px;
   margin-top: 16px;
}

.doc-item {
   display: block;
   padding: 24px;
   background: var(--bg-alt);
   border-radius: 12px;
   border: 1px solid var(--border);
   color: inherit;
   transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.doc-item:hover {
   text-decoration: none;
   transform: translateY(-1px);
   box-shadow: 0 4px 12px rgba(0, 0, 0, 0.06);
}

.doc-item h2 {
   border: none;
   margin: 0 0 6px 0;
   padding: 0;
   font-size: 1.2rem;
   color: var(--text);
}

.doc-item p {
   color: var(--text-secondary);
   margin: 0;
   font-size: 0.95rem;
}

@media (max-width: 600px) {
   .container { padding: 32px 20px 60px; }
   h1 { font-size: 1.75rem; }
   h2 { font-size: 1.3rem; }
}