/* =========================
   Base (Technical Document)
   ========================= */

html {
  font-size: 16px;
}

body {
  max-width: 820px;
  margin: 24px auto;
  padding: 0 20px;
  font-family: system-ui, -apple-system, BlinkMacSystemFont,
               "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.6;
  color: #222;
  background: #fff;
}

/* =========================
   Headings
   ========================= */

h1 {
  font-size: 2.1rem;
  font-weight: 700;
  margin: 0 0 0.8em 0;
}

h2 {
  font-size: 1.4rem;
  font-weight: 600;
  margin: 2.0em 0 0.6em 0;
  border-bottom: 1px solid #ddd;
  padding-bottom: 0.2em;
}

h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin: 1.4em 0 0.4em 0;
}

/* =========================
   Text
   ========================= */

p {
  margin: 0.5em 0;
}

strong {
  font-weight: 600;
}

/* 注意書き：H1直後だけ */
h1 + p {
  border-left: 3px solid #2563eb;
  padding-left: 12px;
  margin: 0.6em 0 1.0em 0;
}

/* =========================
   Lists
   ========================= */

ul {
  margin: 0.6em 0 0.8em 1.2em;
  padding: 0;
}

li {
  margin: 0.25em 0;
}

li p {
  margin: 0.2em 0;
}

/* =========================
   Horizontal rule
   ========================= */

hr {
  border: none;
  border-top: 1px solid #ddd;
  margin: 1.6em 0;
}

/* =========================
   Tables
   ========================= */

table {
  border-collapse: collapse;
  margin: 1em 0;
  width: 100%;
  font-size: 0.95em;
}

th, td {
  border: 1px solid #ccc;
  padding: 6px 8px;
  text-align: left;
}

th {
  background: #f5f5f5;
}

/* =========================
   Code
   ========================= */

pre {
  background: #f6f8fa;
  padding: 10px;
  overflow-x: auto;
  margin: 1em 0;
}

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.9em;
}

/* =========================
   Mermaid
   ========================= */

.mermaid {
  margin: 1em 0;
}

/* =========================
   Links
   ========================= */

a {
  color: #0366d6;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

/* ===================================================
   Top Page Role Layer (Non-invasive)
=================================================== */

/* Product Title */
h1 {
  font-size: 2.1em;            /* 通常h1より一段重く */
  margin-top: 0.5em;
  border-bottom: none;
}

/* Status / Availability note (h1直後想定) */
h1 + p {
  font-size: 0.9em;
  color: #334155;
  background: #eef2f7;
  border-left: 4px solid #2563eb;
  padding: 0.6em 0.9em;
  margin: 0.6em 0 1.6em 0;
  line-height: 1.5;
}

/* Concept paragraph (top-only想定) */
.top-concept {
  font-size: 1.05em;
  margin: 1.2em 0;
}

/* Principles list (safety / philosophy) */
.principles {
  background: #f8fafc;
  border: 1px solid #cbd5e1;
  padding: 0.8em 1.2em;
  border-radius: 4px;
}

.principles li {
  margin: 0.4em 0;
}

/* Entry links (Docs / GitHub) */
.entry-links {
  margin: 1.8em 0;
}

.entry-links a {
  display: inline-block;
  margin-right: 1em;
  padding: 0.45em 0.9em;
  border: 1px solid #2563eb;
  border-radius: 4px;
  font-size: 0.95em;
}

.entry-links a:hover {
  background: #2563eb;
  color: #fff;
}