/* Claude Code Guide — Mobile-first Stylesheet v2 */

:root {
    --bg: #f0f4ff;
    --bg-card: #ffffff;
    --bg-secondary: #e8edf5;
    --text: #1e293b;
    --text-secondary: #64748b;
    --accent: #6366f1;
    --accent-bg: #eef2ff;
    --accent-dark: #4f46e5;
    --green: #10b981;
    --green-bg: #ecfdf5;
    --amber: #f59e0b;
    --amber-bg: #fffbeb;
    --red: #ef4444;
    --red-bg: #fef2f2;
    --blue: #3b82f6;
    --blue-bg: #eff6ff;
    --border: #cbd5e1;
    --code-bg: #1e293b;
    --code-text: #e2e8f0;
    --radius: 16px;
    --radius-sm: 10px;
    --shadow: 0 2px 8px rgba(99,102,241,0.08);
    --shadow-lg: 0 8px 24px rgba(99,102,241,0.12);
    --header-h: 60px;
    --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Noto Sans JP', 'Hiragino Sans', sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', ui-monospace, monospace;
}

[data-theme="dark"] {
    --bg: #0c1222;
    --bg-card: #162032;
    --bg-secondary: #1a2744;
    --text: #f1f5f9;
    --text-secondary: #cbd5e1;
    --accent: #818cf8;
    --accent-bg: #1e1b4b;
    --accent-dark: #a5b4fc;
    --green-bg: #064e3b;
    --amber-bg: #451a03;
    --red-bg: #450a0a;
    --blue-bg: #172554;
    --border: #334155;
    --code-bg: #0f172a;
    --code-text: #e2e8f0;
    --shadow: 0 2px 8px rgba(0,0,0,0.3);
    --shadow-lg: 0 8px 24px rgba(0,0,0,0.4);
}

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

html { font-size: 16px; scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
    font-family: var(--font);
    color: var(--text);
    background: var(--bg);
    line-height: 1.8;
    min-height: 100vh;
}

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

/* ===== HEADER ===== */
.site-header {
    position: fixed;
    top: 0; left: 0; right: 0;
    height: var(--header-h);
    background: var(--accent);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 16px;
    z-index: 100;
    box-shadow: 0 2px 12px rgba(99,102,241,0.3);
}

.site-title {
    font-size: 1.1rem;
    font-weight: 700;
    color: #fff;
    white-space: nowrap;
    letter-spacing: 0.02em;
}

/* Hamburger */
.menu-toggle {
    display: flex;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}
.menu-toggle span {
    display: block;
    width: 22px;
    height: 2.5px;
    background: #fff;
    border-radius: 2px;
    transition: transform 0.3s, opacity 0.3s;
}
.menu-toggle.active span:nth-child(1) { transform: translateY(7.5px) rotate(45deg); }
.menu-toggle.active span:nth-child(2) { opacity: 0; }
.menu-toggle.active span:nth-child(3) { transform: translateY(-7.5px) rotate(-45deg); }

/* Theme toggle */
.theme-toggle {
    background: rgba(255,255,255,0.2);
    border: none;
    cursor: pointer;
    font-size: 1.2rem;
    padding: 6px 10px;
    border-radius: 8px;
    line-height: 1;
}
.theme-toggle:hover { background: rgba(255,255,255,0.3); }
[data-theme="light"] .icon-dark { display: none; }
[data-theme="dark"] .icon-light { display: none; }

/* ===== SIDEBAR ===== */
.sidebar {
    position: fixed;
    top: var(--header-h);
    left: 0;
    bottom: 0;
    width: 280px;
    background: var(--bg-card);
    border-right: 1px solid var(--border);
    transform: translateX(-100%);
    transition: transform 0.3s ease;
    z-index: 90;
    overflow-y: auto;
    padding: 16px 0;
}
.sidebar.open { transform: translateX(0); }

.sidebar-header {
    padding: 4px 20px 16px;
    border-bottom: 1px solid var(--border);
    margin-bottom: 8px;
}
.sidebar-header a { font-weight: 700; font-size: 1rem; }

.sidebar-link {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 24px;
    color: var(--text-secondary);
    font-size: 0.92rem;
    border-radius: 0;
    transition: background 0.15s, color 0.15s;
}
.sidebar-link:hover {
    background: var(--accent-bg);
    color: var(--accent);
    text-decoration: none;
}
.sidebar-link.active {
    color: #fff;
    font-weight: 600;
    background: var(--accent);
}
.sidebar-icon { font-size: 1.2rem; }

.sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    top: var(--header-h);
    background: rgba(0,0,0,0.5);
    z-index: 80;
}
.sidebar-overlay.visible { display: block; }

/* ===== CONTENT ===== */
.content {
    max-width: 860px;
    margin: 0 auto;
    padding: calc(var(--header-h) + 20px) 16px 64px;
}

/* Chapter nav top */
.chapter-nav-top {
    display: flex;
    justify-content: space-between;
    gap: 8px;
    margin-bottom: 20px;
    font-size: 0.85rem;
}
.nav-prev, .nav-next {
    color: var(--accent);
    padding: 8px 14px;
    border: 1.5px solid var(--accent);
    border-radius: var(--radius-sm);
    font-weight: 600;
}
.nav-prev:hover, .nav-next:hover {
    background: var(--accent);
    color: #fff;
    text-decoration: none;
}

/* ===== CHAPTER BODY ===== */
.chapter-body { }

.chapter-body h1 {
    font-size: 1.6rem;
    margin-bottom: 8px;
    color: var(--accent-dark);
    letter-spacing: 0.01em;
}

/* Subtitle line under h1 */
.chapter-body h1 + p {
    color: var(--text-secondary);
    font-size: 0.92rem;
    margin-bottom: 24px;
    padding-bottom: 16px;
    border-bottom: 2px solid var(--border);
}

.chapter-body h2 {
    font-size: 1.3rem;
    margin-top: 36px;
    margin-bottom: 14px;
    padding: 10px 14px;
    background: var(--accent-bg);
    border-left: 4px solid var(--accent);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    color: var(--accent-dark);
    font-weight: 700;
}

.chapter-body h3 {
    font-size: 1.1rem;
    margin-top: 24px;
    margin-bottom: 10px;
    color: var(--text);
    font-weight: 700;
}

.chapter-body h4 {
    font-size: 0.95rem;
    margin-top: 18px;
    margin-bottom: 8px;
    font-weight: 600;
}

.chapter-body p {
    margin-bottom: 14px;
}

.chapter-body ul, .chapter-body ol {
    margin-bottom: 14px;
    padding-left: 20px;
}
.chapter-body li {
    margin-bottom: 8px;
    padding-left: 4px;
}

.chapter-body strong { color: var(--accent-dark); font-weight: 700; }

/* HR */
.chapter-body hr {
    border: none;
    height: 2px;
    background: linear-gradient(90deg, var(--accent), transparent);
    margin: 28px 0;
    border-radius: 1px;
}

/* ===== CODE BLOCKS ===== */
.chapter-body pre {
    background: var(--code-bg);
    color: var(--code-text);
    padding: 16px;
    border-radius: var(--radius-sm);
    overflow-x: auto;
    margin-bottom: 16px;
    font-size: 0.82rem;
    line-height: 1.7;
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
}
.chapter-body code {
    font-family: var(--font-mono);
    font-size: 0.9em;
}
.chapter-body :not(pre) > code {
    background: var(--accent-bg);
    color: var(--accent-dark);
    padding: 3px 8px;
    border-radius: 6px;
    font-size: 0.85em;
    font-weight: 600;
}

/* ===== TABLES ===== */
.table-wrapper {
    overflow-x: auto;
    margin-bottom: 16px;
    -webkit-overflow-scrolling: touch;
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow);
}
.chapter-body table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.88rem;
    background: var(--bg-card);
}
.chapter-body th, .chapter-body td {
    padding: 12px 14px;
    border: 1px solid var(--border);
    text-align: left;
}
.chapter-body th {
    background: var(--accent);
    color: #fff;
    font-weight: 600;
    white-space: nowrap;
    font-size: 0.82rem;
}
.chapter-body tr:nth-child(even) {
    background: var(--bg-secondary);
}

/* ===== MERMAID DIAGRAMS ===== */
.mermaid-wrapper {
    overflow-x: auto;
    margin: 24px 0;
    padding: 20px;
    background: var(--bg-card);
    border-radius: var(--radius);
    border: 2px solid var(--accent);
    box-shadow: var(--shadow-lg);
}
.mermaid {
    display: flex;
    justify-content: center;
    min-width: fit-content;
}

/* ===== CALLOUT BOXES ===== */
.callout {
    padding: 16px 18px;
    border-radius: var(--radius-sm);
    margin-bottom: 16px;
    border-left: 5px solid;
    font-size: 0.92rem;
    box-shadow: var(--shadow);
}
.callout::before {
    font-weight: 700;
    display: block;
    margin-bottom: 4px;
}
.callout p { margin-bottom: 0; }

/* ===== TLDR (3行で分かる) ===== */
.tldr {
    background: var(--blue-bg);
    border-left: 4px solid var(--blue);
    border-radius: 8px;
    padding: 1rem 1.25rem;
    margin: 1.25rem 0;
}
.tldr::before {
    content: "⚡ 3行で分かる";
    display: block;
    font-weight: 700;
    color: var(--blue);
    margin-bottom: 0.5rem;
    font-size: 0.95em;
}
.tldr ol { margin: 0.25rem 0 0 1.25rem; padding-left: 0.5rem; }
.tldr li { margin-bottom: 0.35rem; line-height: 1.5; }

.callout-tip { background: var(--green-bg); border-color: var(--green); }
.callout-tip::before { content: "💡 ヒント"; color: var(--green); }
.callout-warn { background: var(--amber-bg); border-color: var(--amber); }
.callout-warn::before { content: "⚠ 注意"; color: var(--amber); }
.callout-info { background: var(--blue-bg); border-color: var(--blue); }
.callout-info::before { content: "📝 補足"; color: var(--blue); }
.callout-danger { background: var(--red-bg); border-color: var(--red); }
.callout-danger::before { content: "🚫 重要"; color: var(--red); }

/* ===== BOTTOM NAVIGATION ===== */
.chapter-nav-bottom {
    display: flex;
    gap: 12px;
    margin-top: 40px;
    padding-top: 20px;
    border-top: 2px solid var(--border);
}
.nav-card {
    flex: 1;
    padding: 16px;
    background: var(--bg-card);
    border: 1.5px solid var(--border);
    border-radius: var(--radius-sm);
    text-align: center;
    transition: border-color 0.15s, box-shadow 0.15s;
    box-shadow: var(--shadow);
}
.nav-card:hover {
    border-color: var(--accent);
    box-shadow: var(--shadow-lg);
    text-decoration: none;
}
.nav-label {
    display: block;
    font-size: 0.78rem;
    color: var(--text-secondary);
    margin-bottom: 4px;
}
.nav-title {
    display: block;
    font-weight: 700;
    font-size: 0.92rem;
    color: var(--accent-dark);
}

/* ===== INDEX PAGE ===== */
.index-page .content { text-align: center; }

.hero {
    padding: 24px 0 32px;
}
.hero h1 {
    font-size: 1.8rem;
    background: linear-gradient(135deg, var(--accent), #a855f7);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 10px;
}
.hero p {
    color: var(--text-secondary);
    font-size: 0.92rem;
    line-height: 1.6;
}

.chapter-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 14px;
    margin-bottom: 40px;
}

.chapter-card {
    display: flex;
    align-items: flex-start;
    gap: 14px;
    background: var(--bg-card);
    border: 1.5px solid var(--border);
    border-radius: var(--radius);
    padding: 18px 16px;
    text-align: left;
    transition: transform 0.15s, box-shadow 0.15s, border-color 0.15s;
    box-shadow: var(--shadow);
}
.chapter-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    border-color: var(--accent);
    text-decoration: none;
}
.card-icon { font-size: 2.2rem; flex-shrink: 0; }
.card-body { flex: 1; min-width: 0; }
.card-number {
    font-size: 0.7rem;
    color: #fff;
    font-weight: 700;
    background: var(--accent);
    padding: 2px 8px;
    border-radius: 20px;
    display: inline-block;
    margin-bottom: 4px;
}
.card-title {
    font-size: 1.05rem;
    margin-bottom: 4px;
    color: var(--text);
    font-weight: 700;
}
.card-desc {
    font-size: 0.82rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* Features */
.features {
    margin-bottom: 40px;
    text-align: left;
}
.features h2 {
    text-align: center;
    margin-bottom: 20px;
    font-size: 1.2rem;
}
.feature-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}
.feature-item {
    text-align: center;
    padding: 16px 12px;
    background: var(--bg-card);
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
}
.feature-icon { font-size: 1.8rem; display: block; margin-bottom: 6px; }
.feature-item h3 { font-size: 0.88rem; margin-bottom: 4px; }
.feature-item p { font-size: 0.78rem; color: var(--text-secondary); }

/* Footer */
.site-footer {
    text-align: center;
    padding: 20px;
    font-size: 0.8rem;
    color: var(--text-secondary);
    border-top: 1px solid var(--border);
}
.site-footer a { color: var(--accent); }

/* ===== TOC ===== */
.toc {
    background: var(--bg-card);
    border: 1.5px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 16px 20px;
    margin-bottom: 24px;
    box-shadow: var(--shadow);
}
.toc-title {
    font-weight: 700;
    font-size: 0.95rem;
    margin-bottom: 10px;
    color: var(--accent-dark);
}
.toc-list {
    list-style: none;
    padding: 0;
    margin: 0;
    columns: 2;
    column-gap: 20px;
}
.toc-list li {
    margin-bottom: 4px;
    padding-left: 0;
    break-inside: avoid;
}
.toc-list a {
    font-size: 0.85rem;
    color: var(--text-secondary);
    display: inline-block;
    padding: 2px 0;
    transition: color 0.15s;
}
.toc-list a:hover {
    color: var(--accent);
    text-decoration: none;
}
.toc-h3 {
    padding-left: 14px;
}
.toc-h3::before {
    content: "└ ";
    color: var(--border);
}

/* ===== COPY BUTTON ===== */
.code-block-wrapper {
    position: relative;
    margin-bottom: 16px;
}
.code-block-wrapper pre {
    margin-bottom: 0;
}
.copy-btn {
    position: absolute;
    top: 8px;
    right: 8px;
    background: rgba(255,255,255,0.12);
    color: var(--code-text);
    border: 1px solid rgba(255,255,255,0.2);
    border-radius: 6px;
    padding: 4px 10px;
    font-size: 0.72rem;
    cursor: pointer;
    opacity: 0;
    transition: opacity 0.2s, background 0.15s;
    font-family: var(--font);
}
.code-block-wrapper:hover .copy-btn {
    opacity: 1;
}
.copy-btn:hover {
    background: rgba(255,255,255,0.22);
}
.copy-btn.copied {
    background: rgba(16,185,129,0.3);
    border-color: var(--green);
}

/* ===== SEARCH BAR ===== */
.search-bar {
    display: flex;
    align-items: center;
    gap: 6px;
    margin-bottom: 16px;
    padding: 8px 12px;
    background: var(--bg-card);
    border: 1.5px solid var(--border);
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow);
}
.search-bar input {
    flex: 1;
    border: none;
    background: transparent;
    color: var(--text);
    font-size: 0.9rem;
    font-family: var(--font);
    outline: none;
}
.search-bar input::placeholder {
    color: var(--text-secondary);
    opacity: 0.6;
}
.search-count {
    font-size: 0.78rem;
    color: var(--text-secondary);
    white-space: nowrap;
    min-width: 36px;
    text-align: center;
}
.search-bar button {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-secondary);
    font-size: 0.85rem;
    padding: 4px 6px;
    border-radius: 4px;
    transition: background 0.15s, color 0.15s;
}
.search-bar button:hover {
    background: var(--accent-bg);
    color: var(--accent);
}

/* Search highlights */
.search-highlight {
    background: var(--amber);
    color: #000;
    border-radius: 2px;
    padding: 0 2px;
}
.search-current {
    background: var(--amber);
    outline: 2px solid var(--accent);
    outline-offset: 1px;
}

/* ===== TABLET (768px+) ===== */
@media (min-width: 768px) {
    .content { padding-left: 32px; padding-right: 32px; }
    .chapter-grid { grid-template-columns: 1fr 1fr; }
    .chapter-card { padding: 22px 20px; }
    .feature-grid { grid-template-columns: repeat(4, 1fr); }
}

/* ===== DESKTOP (1024px+) ===== */
@media (min-width: 1024px) {
    .menu-toggle { display: none; }
    .sidebar { transform: translateX(0); width: 260px; }
    .sidebar-overlay { display: none !important; }
    .content {
        margin-left: 260px;
        max-width: 900px;
        padding-left: 40px;
        padding-right: 40px;
    }
    .chapter-grid { grid-template-columns: 1fr 1fr; }
}

/* === 注釈強化: ホバー解説 (.term/.term-popup/#term-tooltip) === */
.term {
  border-bottom: 1px dashed var(--accent);
  cursor: help;
  transition: color 0.2s;
}
.term:hover, .term:focus { color: var(--accent-dark); }
.term-popup { display: none; }  /* JS が #term-tooltip へ複製して表示 */
#term-tooltip {
  display: none;
  position: fixed;
  background: var(--accent-bg);
  border: 1px solid var(--accent);
  border-radius: 8px;
  padding: 8px 14px;
  font-size: 0.85rem;
  line-height: 1.5;
  max-width: 280px;
  z-index: 9999;
  box-shadow: 0 4px 12px rgba(0,0,0,.15);
}
#term-tooltip::after {
  content: '';
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  border: 6px solid transparent;
}
#term-tooltip.below::after {
  top: auto; bottom: 100%;
  border-bottom-color: var(--accent);
}

/* === 注釈強化: 「なぜ」box === */
.why-box {
  background: var(--accent-bg);
  border-left: 3px solid var(--accent);
  border-radius: 6px;
  padding: 0.7rem 1rem;
  margin: 0.8rem 0;
  font-size: 0.88rem;
}
.why-box strong { color: var(--accent-dark); }

/* === 注釈強化: フロー図 === */
.flow-diagram {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.4rem;
  margin: 1.2rem 0;
  padding: 1rem;
  background: var(--accent-bg);
  border-radius: 10px;
}
.flow-node {
  background: var(--bg, #fff);
  border: 1px solid var(--accent);
  border-radius: 8px;
  padding: 0.6rem 1rem;
  text-align: center;
  max-width: 360px;
  font-size: 0.9rem;
}
.flow-node small { display: block; opacity: 0.75; font-size: 0.78rem; margin-top: 0.2rem; }
.flow-arrow { color: var(--accent); font-size: 1.2rem; font-weight: 700; }
@media (max-width: 480px) {
  .flow-node { max-width: 100%; font-size: 0.85rem; }
}

/* === 注釈強化: ダークモード視認性強化 === */
[data-theme="dark"] .why-box { color: #f1f5f9; }
[data-theme="dark"] .why-box strong { color: #c7d2fe; }
[data-theme="dark"] #term-tooltip { color: #f1f5f9; background: #312e81; }
[data-theme="dark"] .flow-node { background: var(--bg-card); color: #f1f5f9; }
[data-theme="dark"] .flow-node small { opacity: 0.9; color: #cbd5e1; }

/* === ダークモード: 表と code の視認性強化 === */
[data-theme="dark"] .acc-content code { background: #312e81; color: #f1f5f9; border: 1px solid #4f46e5; }
[data-theme="dark"] .acc-content th { background: #3730a3; color: #ffffff; }
[data-theme="dark"] .acc-content td { color: #f1f5f9; }
[data-theme="dark"] .acc-content td code { background: #312e81; color: #fde68a; }

/* === start.html: やさしい入口(2026-07-05 追記) === */
.start-page { max-width: 900px; margin: 0 auto; padding: 1rem 1rem 4rem; }
.start-lead { font-size: 1.05rem; line-height: 1.8; background: var(--accent-bg, #eef2ff); border: 1px solid var(--accent, #6366f1); border-radius: var(--radius, 16px); padding: 1.2rem 1.4rem; margin-bottom: 1.5rem; }
.start-step { border: 1px solid var(--border, #cbd5e1); border-radius: var(--radius, 16px); padding: 1.4rem 1.6rem; margin-bottom: 1.5rem; background: var(--bg-card, #fff); }
.start-step h2 { color: var(--accent, #6366f1); margin-top: 0; }
.start-step h3 { color: var(--accent-dark, #4f46e5); margin-top: 1.2rem; }
.start-stars { color: var(--accent, #6366f1); letter-spacing: 2px; }
.start-ladder { display: flex; gap: .25rem; margin: .8rem 0 1.2rem; }
.start-ladder > span { flex: 1; height: .5rem; border-radius: 4px; background: var(--border, #cbd5e1); }
.start-ladder > span.on { background: var(--accent, #6366f1); }
.start-next { background: var(--accent-bg, #eef2ff); border: 1px solid var(--accent, #6366f1); border-radius: var(--radius, 16px); padding: 1.2rem 1.4rem; }
.start-next a, .start-next a:visited { color: var(--accent-dark, #4f46e5); }
.start-note { font-size: .85rem; opacity: .7; margin-top: 1rem; margin-bottom: 0; }
/* 導線注釈ボックス(index/operation冒頭用) */
.firsttime-box { background: var(--accent-bg, #eef2ff); border: 1px solid var(--accent, #6366f1); border-radius: 12px; padding: .8rem 1.1rem; margin: 1rem 0; font-size: .92rem; }
.firsttime-box a { color: var(--accent-dark, #4f46e5); font-weight: 600; }
/* サイトナビ(3頁共通) */
.site-nav { display: flex; gap: 1rem; flex-wrap: wrap; padding: .8rem 1rem; background: var(--bg-secondary, #e8edf5); border-bottom: 1px solid var(--border, #cbd5e1); }
.site-nav a, .site-nav a:visited { color: var(--accent-dark, #4f46e5); text-decoration: none; font-size: .92rem; }
.site-nav a:hover { text-decoration: underline; }
.site-footer { border-top: 1px solid var(--border, #cbd5e1); padding: 1rem; }
.site-footer .site-nav { background: transparent; border: none; justify-content: center; }