/* article-v2.css — LP v4統一デザイン 記事共通スタイル */

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

:root {
  --bg: #070B14; --card: rgba(255,255,255,0.03); --card-hover: rgba(255,255,255,0.05);
  --border: rgba(255,255,255,0.08); --border-dim: rgba(255,255,255,0.04);
  --text: #E2EAF2; --text-mid: rgba(226,234,242,0.8); --text-sub: rgba(226,234,242,0.5); --text-dim: rgba(226,234,242,0.3);
  --green: #00E5A0; --green-bg: rgba(0,229,160,0.06); --green-bdr: rgba(0,229,160,0.15);
  --purple: #B388FF; --purple-bg: rgba(179,136,255,0.06); --purple-bdr: rgba(179,136,255,0.18);
  --orange: #FFB74D; --orange-bg: rgba(255,183,77,0.06); --orange-bdr: rgba(255,183,77,0.18);
  --red: #FF6B5E; --red-bg: rgba(255,107,94,0.06); --red-bdr: rgba(255,107,94,0.15);
  --yellow: #FFD54F; --yellow-bg: rgba(255,213,79,0.08); --yellow-bdr: rgba(255,213,79,0.2);
  --blue: #378ADD;
}

body {
  font-family: 'Noto Sans JP', -apple-system, BlinkMacSystemFont, 'Hiragino Sans', sans-serif;
  background: var(--bg); color: var(--text);
  line-height: 1.9; font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

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

/* ===== Sticky Header (LP v4) ===== */
.hd {
  position: sticky; top: 0; z-index: 200;
  background: rgba(7,11,20,0.92); backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border); padding: 12px 20px;
}
.hd-in {
  max-width: 720px; margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
}
.logo { font-size: 16px; font-weight: 900; color: var(--text); text-decoration: none; }
.logo em { color: var(--green); font-style: normal; }
.nav { display: flex; gap: 16px; }
.nav a {
  color: var(--text-sub); font-size: 14px; font-weight: 600;
  min-height: 48px; display: flex; align-items: center; text-decoration: none;
}
.nav a:hover { color: var(--text); }

/* ===== Main container ===== */
.main { max-width: 720px; margin: 0 auto; padding: 0 20px 80px; }

/* ===== Breadcrumb ===== */
.crumb { font-size: 14px; color: var(--text-dim); padding: 12px 0 0; }
.crumb a { color: var(--text-sub); text-decoration: none; }
.crumb a, .crumb span { display: inline-flex; min-height: 48px; align-items: center; }
.crumb a:hover { color: var(--green); }

/* ===== Article header ===== */
.article-header { padding: 24px 0 20px; margin-bottom: 32px; border-bottom: 2px solid var(--border); }
.article-header h1 {
  font-size: 26px; font-weight: 700; line-height: 1.5;
  margin-bottom: 8px; color: var(--text);
}
.article-meta { font-size: 13px; color: var(--text-sub); }

/* ===== Summary box ===== */
.summary-box {
  background: var(--green-bg); border-left: 4px solid var(--green);
  padding: 20px 24px; border-radius: 0 12px 12px 0; margin-bottom: 40px;
}
.summary-box h2 {
  font-size: 16px; font-weight: 700; color: var(--green); margin-bottom: 10px;
  border: none; padding: 0;
}
.summary-box ul { padding-left: 20px; font-size: 14px; line-height: 2; color: var(--text-mid); }

/* ===== TOC ===== */
.toc {
  background: var(--card); border: 1px solid var(--border);
  border-radius: 14px; padding: 20px 24px; margin-bottom: 40px;
}
.toc-title { font-size: 16px; font-weight: 700; color: var(--text); margin-bottom: 12px; }
.toc ol { padding-left: 20px; font-size: 14px; line-height: 2.4; color: var(--text-sub); }
.toc a { color: var(--green); text-decoration: none; }
.toc a:hover { text-decoration: underline; }

/* ===== Headings ===== */
h2 {
  font-size: 22px; font-weight: 700;
  border-left: 4px solid var(--green); padding-left: 14px;
  margin: 48px 0 20px; color: var(--text);
}
h3 {
  font-size: 18px; font-weight: 700;
  margin: 32px 0 12px; padding-bottom: 6px;
  border-bottom: 1px solid var(--border); color: var(--text);
}
h4 { font-size: 16px; font-weight: 700; margin: 24px 0 8px; color: var(--text-mid); }

/* ===== Body text ===== */
p { margin-bottom: 16px; color: var(--text-mid); line-height: 1.9; }
strong { color: var(--green); }
ul, ol { color: var(--text-mid); margin-bottom: 16px; }
li { line-height: 1.9; }

/* ===== Blockquote ===== */
blockquote {
  border-left: 4px solid var(--purple);
  background: var(--purple-bg);
  padding: 16px 20px; margin: 24px 0;
  border-radius: 0 12px 12px 0;
  color: var(--text-mid); font-size: 15px;
}

/* ===== Table ===== */
table { width: 100%; border-collapse: collapse; margin: 20px 0; font-size: 14px; }
th {
  background: rgba(255,255,255,0.06); color: var(--text-sub);
  padding: 10px 14px; text-align: left; font-weight: 600;
  border-bottom: 2px solid var(--border);
}
td { padding: 10px 14px; border-bottom: 1px solid var(--border-dim); color: var(--text-mid); }
tr:nth-child(even) td { background: rgba(255,255,255,0.02); }
tr:hover td { background: rgba(0,229,160,0.04); }
.table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; }

/* ===== Code ===== */
code {
  background: rgba(255,255,255,0.08); padding: 2px 6px;
  border-radius: 4px; font-size: 14px; color: var(--orange);
}
pre {
  background: rgba(255,255,255,0.04); border: 1px solid var(--border);
  border-radius: 10px; padding: 16px; overflow-x: auto;
  margin: 20px 0; font-size: 14px; line-height: 1.7; color: var(--text-mid);
}

/* ===== Image ===== */
img { max-width: 100%; height: auto; border-radius: 12px; }

/* ===== Illustration ===== */
.illust {
  margin: 32px 0; background: rgba(255,255,255,0.95);
  border: 1px solid var(--border); border-radius: 12px;
  padding: 20px 12px; overflow-x: auto;
}
.illust-caption { text-align: center; font-size: 13px; color: var(--text-sub); margin-top: 8px; }

/* ===== SVG fix ===== */
svg text { font-family: 'Noto Sans JP', sans-serif; }
.svg-title { font-size: 14px; font-weight: 700; fill: var(--text); }
.svg-sub { font-size: 12px; font-weight: 400; fill: var(--text-sub); }
.svg-label { font-size: 11px; font-weight: 400; fill: var(--text-mid); }
/* illust内のSVGは白背景なのでテキストを暗色に */
.illust svg text { fill: #1a1a2e; }
.illust .svg-title { fill: #1a1a2e; }
.illust .svg-sub { fill: #444; }
.illust .svg-label { fill: #555; }
.illust svg [fill="var(--text)"] { fill: #1a1a2e; }
.illust svg [fill="var(--text-sub)"] { fill: #444; }
.illust svg [fill="var(--text-mid)"] { fill: #555; }
.illust svg [fill="var(--text-dim)"] { fill: #777; }

/* ===== Callout / Tip / Warning cards ===== */
.callout, .tip, .warning, .highlight, .point-box, .quiz-box, .stat-card, .flow-step, .compare-card {
  padding: 20px 24px; margin: 24px 0;
  border-radius: 14px; font-size: 15px; line-height: 1.9;
}
.callout {
  background: var(--card); border: 1px solid var(--border); color: var(--text-mid);
}
.tip {
  background: var(--green-bg); border: 1px solid var(--green-bdr); color: var(--text-mid);
}
.tip strong { color: var(--green); }
.warning, .highlight {
  background: var(--yellow-bg); border: 1px solid var(--yellow-bdr); color: var(--text-mid);
}
.warning strong, .highlight strong { color: var(--yellow); }
.point-box {
  background: var(--card); border: 1px solid var(--border); color: var(--text-mid);
}
.quiz-box {
  background: var(--purple-bg); border: 1px solid var(--purple-bdr); color: var(--text-mid);
}
.stat-card, .flow-step, .compare-card {
  background: var(--card); border: 1px solid var(--border); color: var(--text-mid);
}

/* ===== CTA box (old) ===== */
.cta-box {
  background: linear-gradient(135deg, rgba(0,229,160,0.12), rgba(0,229,160,0.04));
  border: 1px solid var(--green-bdr);
  border-radius: 16px; padding: 28px 32px; text-align: center; margin: 40px 0;
}
.cta-box h3 { color: var(--green); border: none; font-size: 20px; margin: 0 0 8px; padding: 0; }
.cta-box p { color: var(--text-mid); margin-bottom: 16px; }
.cta-btn {
  display: inline-block; background: var(--green); color: var(--bg);
  font-weight: 700; padding: 12px 32px; border-radius: 10px;
  text-decoration: none; font-size: 15px;
}
.cta-btn:hover { opacity: 0.85; text-decoration: none; }

/* ===== CTA Stripe (LP v4) ===== */
.cta-section { margin-top: 40px; display: flex; flex-direction: column; gap: 10px; }
.cta-stripe {
  display: grid; grid-template-columns: 5px 1fr;
  border-radius: 14px; border: 1px solid var(--border); background: var(--card);
  overflow: hidden; text-decoration: none; color: var(--text); transition: background 0.15s;
}
.cta-stripe:hover { background: var(--card-hover); text-decoration: none; }
.cta-stripe-bar { min-height: 100%; }
.cta-stripe-body { padding: 16px 18px; }
.cta-stripe-title { font-size: 16px; font-weight: 700; }
.cta-stripe-sub { font-size: 13px; color: var(--text-sub); margin-top: 2px; }

/* ===== Related articles ===== */
.related { margin: 32px 0; }
.related h3 { font-size: 16px; font-weight: 700; margin-bottom: 12px; border: none; padding: 0; }
.related-cards { display: grid; grid-template-columns: repeat(auto-fill,minmax(280px,1fr)); gap: 10px; margin: 16px 0; }
.related-card-v2 {
  display: block; padding: 14px 16px; border-radius: 10px;
  background: var(--card); border: 1px solid var(--border);
  text-decoration: none; color: inherit; transition: all 0.2s;
}
.related-card-v2:hover { border-color: var(--green-bdr); background: var(--green-bg); }
.related-card-title { font-size: 14px; font-weight: 700; color: var(--text); margin-bottom: 4px; }
.related-card-arrow { font-size: 12px; color: var(--green); }

/* ===== Series nav ===== */
.series-nav {
  margin: 24px 0; padding: 14px;
  border-radius: 14px; background: var(--card); border: 1px solid var(--border);
}
.series-title { font-size: 13px; font-weight: 700; margin-bottom: 8px; color: var(--text-sub); }
.series-links { display: flex; flex-wrap: wrap; gap: 6px; }
.series-link {
  display: inline-block; padding: 5px 12px; border-radius: 6px;
  font-size: 12px; text-decoration: none; color: var(--green);
  background: rgba(255,255,255,0.03); border: 1px solid var(--border); transition: all 0.2s;
}
.series-link:hover { border-color: var(--green-bdr); }
.series-link.current { background: var(--green-bg); border-color: var(--green-bdr); color: var(--green); font-weight: 700; }

/* ===== Tool links ===== */
.tool-links { margin: 24px 0; }
.tool-links h3 { border: none; padding: 0; margin: 0 0 0; font-size: 16px; }
.tool-link-grid { display: grid; grid-template-columns: repeat(auto-fill,minmax(220px,1fr)); gap: 8px; margin-top: 10px; }
.tool-link {
  display: flex; align-items: center; gap: 8px;
  padding: 10px 14px; border-radius: 10px;
  background: var(--green-bg); border: 1px solid var(--green-bdr);
  text-decoration: none; color: var(--green); font-size: 13px; font-weight: 600; transition: all 0.2s;
}
.tool-link:hover { background: rgba(0,229,160,0.12); }
.tool-link-icon { font-size: 16px; }

/* ===== References ===== */
.references {
  margin: 32px 0; padding: 20px; border-radius: 14px;
  background: var(--card); border: 1px solid var(--border);
}
.references h3 { font-size: 15px; font-weight: 700; margin: 0 0 12px; padding: 0; border: none; color: var(--text); }
.references h4 { font-size: 13px; font-weight: 700; margin: 12px 0 6px; padding: 0; border: none; color: var(--text-sub); }
.references ul { padding-left: 20px; margin: 0; }
.references li { font-size: 12px; line-height: 1.8; color: var(--text-sub); }
.references a { color: var(--green); }

/* ===== Verification note ===== */
.verification-note {
  margin: 28px 0; padding: 20px; border-radius: 14px;
  background: var(--orange-bg); border-left: 4px solid var(--orange);
}
.verification-note h3 { font-size: 15px; font-weight: 700; color: var(--orange); margin: 0 0 10px; padding: 0; border: none; }
.verification-note p { font-size: 13px; line-height: 1.9; color: var(--text-sub); margin: 8px 0; }
.verification-note a { color: var(--green); font-weight: 600; }

/* ===== Disclaimer ===== */
.disc {
  margin-top: 36px; padding: 20px;
  border: 1px solid var(--border); border-radius: 14px;
  background: var(--card); font-size: 14px; color: var(--text-sub); line-height: 1.9;
}
.disc strong { color: var(--text); display: block; margin-bottom: 6px; font-size: 15px; }
/* Legacy .disclaimer class */
.disclaimer {
  margin-top: 40px; padding: 16px;
  background: var(--card); border: 1px solid var(--border);
  border-radius: 10px; font-size: 12px; color: var(--text-sub);
}

/* ===== Footer ===== */
.ft {
  text-align: center; padding: 28px 20px;
  font-size: 14px; color: var(--text-dim);
  border-top: 1px solid var(--border); margin-top: 36px;
}
.ft a { color: var(--text-sub); text-decoration: none; margin: 0 10px; display: inline-flex; min-height: 48px; align-items: center; }

/* ===== AI Summary (hidden) ===== */
.ai-tldr { display: none; }

/* ===== Classroom FAB ===== */
.classroom-fab {
  position: fixed; bottom: 24px; right: 24px; z-index: 999;
  display: flex; align-items: center; gap: 8px;
  padding: 10px 16px; border-radius: 30px;
  background: rgba(7,11,20,0.92); backdrop-filter: blur(16px);
  border: 1px solid var(--green-bdr);
  text-decoration: none; color: var(--green);
  font-size: 13px; font-weight: 700;
  font-family: 'Noto Sans JP', sans-serif; transition: all 0.2s;
}
.classroom-fab:hover { background: var(--green-bg); transform: translateY(-2px); }
.classroom-fab .fab-icon { font-size: 22px; }

/* ===== Responsive ===== */
@media (max-width: 640px) {
  .main { padding: 0 16px 60px; }
  .article-header h1 { font-size: 22px; }
  h2 { font-size: 20px; }
  h3 { font-size: 16px; }
  .summary-box { padding: 16px 18px; }
  .cta-box { padding: 20px 18px; }
  .related-cards { grid-template-columns: 1fr; }
  .tool-link-grid { grid-template-columns: 1fr; }
  .classroom-fab { bottom: 70px; right: 12px; padding: 8px 12px; font-size: 12px; }
  .nav { gap: 10px; }
  .nav a { font-size: 12px; }
}