/* 投資のつまずき辞典 — design tokens
   ground: cool paper / ink: green-black / accent: ledger teal / warn: amber */
:root {
  --bg: #f6f7f5;
  --surface: #ffffff;
  --surface-2: #eceeea;
  --line: #d8dcd6;
  --ink: #1b1f1d;
  --ink-2: #4f5753;
  --ink-3: #7d8681;
  --accent: #0f6e56;
  --accent-soft: #e2efea;
  --warn: #b8741a;
  --warn-soft: #f7ecda;
  --link: #0f6e56;
  --shadow: 0 1px 2px rgba(20, 30, 26, .05), 0 4px 16px rgba(20, 30, 26, .05);
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #101312;
    --surface: #171b19;
    --surface-2: #1f2522;
    --line: #2c3430;
    --ink: #ecefea;
    --ink-2: #b3bbb6;
    --ink-3: #7d8681;
    --accent: #4fbf9f;
    --accent-soft: #163229;
    --warn: #e0a44a;
    --warn-soft: #2f2617;
    --link: #6fd3b6;
    --shadow: 0 1px 2px rgba(0, 0, 0, .4), 0 6px 20px rgba(0, 0, 0, .35);
  }
}
:root[data-theme="dark"] {
  --bg: #101312;
  --surface: #171b19;
  --surface-2: #1f2522;
  --line: #2c3430;
  --ink: #ecefea;
  --ink-2: #b3bbb6;
  --ink-3: #7d8681;
  --accent: #4fbf9f;
  --accent-soft: #163229;
  --warn: #e0a44a;
  --warn-soft: #2f2617;
  --link: #6fd3b6;
  --shadow: 0 1px 2px rgba(0, 0, 0, .4), 0 6px 20px rgba(0, 0, 0, .35);
}

* { box-sizing: border-box; }
/* Japanese headings: break only at phrase boundaries (ZWSP inserted at build time by BudouX) */
h1, h2, h3, .card h2, .faq summary { word-break: keep-all; overflow-wrap: anywhere; line-break: strict; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Noto Sans JP", "Hiragino Sans", "Yu Gothic", system-ui, sans-serif;
  font-size: 16.5px;
  line-height: 1.95;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--link); text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }
a:focus-visible, button:focus-visible, summary:focus-visible { outline: 2px solid var(--warn); outline-offset: 2px; }
.wrap { max-width: 720px; margin: 0 auto; padding: 0 20px; }

/* header */
.site-head { border-bottom: 1px solid var(--line); background: var(--bg); }
.site-head .row { display: flex; align-items: center; justify-content: space-between; gap: 16px; height: 60px; }
.brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; color: var(--ink); }
.brand-mark { display: inline-grid; place-items: center; width: 30px; height: 30px; border-radius: 7px; background: var(--accent); color: #f6f7f5; font-family: "Shippori Mincho B1", "Hiragino Mincho ProN", serif; font-weight: 800; font-size: 17px; }
.brand-name { font-family: "Shippori Mincho B1", "Hiragino Mincho ProN", serif; font-weight: 800; font-size: 17px; letter-spacing: .02em; }
.nav { display: flex; gap: 18px; font-size: 13.5px; }
.nav a { color: var(--ink-2); text-decoration: none; }
.nav a:hover { color: var(--ink); }

/* hero / index */
.hero { padding: 44px 0 28px; border-bottom: 1px solid var(--line); }
.eyebrow { margin: 0 0 10px; font-size: 12.5px; letter-spacing: .08em; color: var(--accent); font-weight: 700; }
.hero h1 { margin: 0 0 14px; font-family: "Shippori Mincho B1", "Hiragino Mincho ProN", serif; font-weight: 800; font-size: clamp(24px, 4.6vw, 32px); line-height: 1.4; letter-spacing: .01em; text-wrap: balance; }
.lede { margin: 0; color: var(--ink-2); font-size: 15.5px; max-width: 40em; }
.list { padding: 28px 0 56px; }
.list-head { margin: 0 0 16px; font-size: 13px; letter-spacing: .1em; color: var(--ink-3); font-weight: 700; }
.cards { list-style: none; margin: 0; padding: 0; display: grid; gap: 14px; }
.card a { display: block; padding: 18px 20px; background: var(--surface); border: 1px solid var(--line); border-radius: 10px; text-decoration: none; color: var(--ink); box-shadow: var(--shadow); }
.card a:hover { border-color: var(--accent); }
.card-date { margin: 0 0 6px; font-family: "IBM Plex Mono", monospace; font-size: 12px; color: var(--ink-3); font-variant-numeric: tabular-nums; }
.card h2 { margin: 0 0 6px; font-family: "Shippori Mincho B1", "Hiragino Mincho ProN", serif; font-weight: 700; font-size: 18.5px; line-height: 1.45; text-wrap: balance; }
.card-desc { margin: 0; color: var(--ink-2); font-size: 14px; line-height: 1.7; }

/* article */
.post { padding: 36px 0 64px; }
.post-head { margin-bottom: 22px; }
.post-head h1 { margin: 0 0 12px; font-family: "Shippori Mincho B1", "Hiragino Mincho ProN", serif; font-weight: 800; font-size: clamp(23px, 4.4vw, 30px); line-height: 1.45; text-wrap: balance; }
.meta { margin: 0; font-size: 13px; color: var(--ink-3); font-variant-numeric: tabular-nums; }
.pr { margin: 10px 0 0; font-size: 12.5px; color: var(--ink-3); }
.tag { display: inline-block; margin-right: 6px; padding: 2px 9px; border-radius: 999px; background: var(--accent-soft); color: var(--accent); font-size: 12px; font-weight: 700; letter-spacing: .02em; }

.answer { margin: 0 0 26px; padding: 16px 18px; background: var(--accent-soft); border-left: 4px solid var(--accent); border-radius: 0 10px 10px 0; }
.answer-label { margin: 0 0 8px; font-size: 13px; letter-spacing: .12em; font-weight: 800; color: var(--accent); }
.answer { font-size: 16px; line-height: 1.9; }
.answer p:last-child { margin-bottom: 0; }
.answer ul { margin: 6px 0 0; padding-left: 1.2em; }

.toc-wrap { margin: 0 0 30px; }
.toc { padding: 14px 18px; background: var(--surface); border: 1px solid var(--line); border-radius: 10px; font-size: 14px; }
.toc .toctitle { display: block; margin: 0 0 6px; font-size: 12px; letter-spacing: .1em; font-weight: 700; color: var(--ink-3); }
.toc ul { margin: 0; padding-left: 1.2em; }
.toc li { margin: 2px 0; }
.toc a { color: var(--ink-2); text-decoration: none; }
.toc a:hover { color: var(--accent); }

.prose { max-width: 42em; }
.prose h2 { margin: 56px 0 18px; padding: 8px 0 8px 16px; border-left: 5px solid var(--accent); border-top: 0; font-family: "Shippori Mincho B1", "Hiragino Mincho ProN", serif; font-weight: 800; font-size: 22px; line-height: 1.5; text-wrap: balance; background: linear-gradient(90deg, var(--accent-soft), transparent 70%); border-radius: 0 8px 8px 0; }
.prose h3 { margin: 34px 0 12px; padding-bottom: 6px; font-size: 17.5px; font-weight: 700; line-height: 1.5; border-bottom: 2px solid var(--line); }
.prose p { margin: 0 0 1.5em; }
.prose ul, .prose ol { margin: 0 0 1.2em; padding-left: 1.4em; }
.prose li { margin: .45em 0; }
.prose strong { font-weight: 700; color: var(--ink); background: linear-gradient(transparent 62%, var(--warn-soft) 62%); padding: 0 .1em; }
.prose blockquote { margin: 0 0 1.2em; padding: 10px 16px; border-left: 3px solid var(--line); color: var(--ink-2); background: var(--surface); border-radius: 0 8px 8px 0; }
.prose hr { border: 0; border-top: 1px solid var(--line); margin: 32px 0; }
.prose code { font-family: "IBM Plex Mono", monospace; font-size: .92em; background: var(--surface-2); padding: 1px 5px; border-radius: 4px; }
.prose .table-wrap, .prose table { display: block; overflow-x: auto; }
.prose table { width: 100%; border-collapse: collapse; margin: 0 0 1.4em; font-size: 14px; }
.prose th, .prose td { padding: 10px 12px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; white-space: normal; min-width: 7em; line-height: 1.6; }
.prose th { background: var(--surface-2); font-weight: 700; font-size: 13px; white-space: nowrap; }
.prose td { font-variant-numeric: tabular-nums; }
.prose tbody tr:nth-child(even) td { background: color-mix(in srgb, var(--surface-2) 45%, transparent); }
.prose td:first-child { font-weight: 700; }
.prose img { max-width: 100%; height: auto; border-radius: 8px; }

/* callouts: つまずき / 回避法 / 補足 */
.stumble, .fix, .note { margin: 0 0 1.4em; padding: 14px 16px 12px; border-radius: 10px; font-size: 15px; }
.stumble { background: var(--warn-soft); border: 1px solid color-mix(in srgb, var(--warn) 40%, transparent); }
.fix { background: var(--accent-soft); border: 1px solid color-mix(in srgb, var(--accent) 40%, transparent); }
.note { background: var(--surface); border: 1px solid var(--line); }
.stumble > :first-child, .fix > :first-child, .note > :first-child { margin-top: 0; }
.stumble > :last-child, .fix > :last-child, .note > :last-child { margin-bottom: 0; }
.stumble .label, .fix .label, .note .label { display: block; font-size: 12px; letter-spacing: .1em; font-weight: 700; margin-bottom: 4px; }
.stumble .label { color: var(--warn); }
.fix .label { color: var(--accent); }
.note .label { color: var(--ink-3); }

.sources { margin-top: 40px; padding: 10px 14px; font-size: 13.5px; color: var(--ink-2); border: 1px solid var(--line); border-radius: 8px; background: var(--surface); }
.sources summary { cursor: pointer; font-weight: 700; color: var(--ink-2); }
.sources ol { padding-left: 1.4em; margin: 10px 0 4px; }
.sources li { margin: .3em 0; word-break: break-all; }

.faq-wrap { margin-top: 44px; }
.faq-wrap h2 { font-family: "Shippori Mincho B1", serif; font-size: 20px; margin: 0 0 12px; }
.faq { margin: 0 0 8px; padding: 10px 14px; background: var(--surface); border: 1px solid var(--line); border-radius: 8px; }
.faq summary { cursor: pointer; font-weight: 700; }
.faq p { margin: 8px 0 0; color: var(--ink-2); font-size: 15px; }

.related { margin-top: 44px; padding-top: 18px; border-top: 1px solid var(--line); }
.related h2 { font-size: 13px; letter-spacing: .1em; color: var(--ink-3); margin: 0 0 10px; }
.related ul { margin: 0; padding-left: 1.2em; }
.related li { margin: 4px 0; font-size: 15px; }

/* footer */
.site-foot { border-top: 1px solid var(--line); padding: 26px 0 40px; background: var(--bg); }
.foot-note { margin: 0 0 8px; font-size: 12.5px; color: var(--ink-3); line-height: 1.7; }
.foot-meta { margin: 12px 0 0; font-size: 12.5px; color: var(--ink-3); }

@media (max-width: 520px) {
  .nav { gap: 12px; font-size: 13px; }
  .card a { padding: 16px; }
}
@media (prefers-reduced-motion: reduce) { * { transition: none !important; } }

/* affiliate CTA box (PR) */
.cta { margin: 1.6em 0; padding: 16px 18px; border: 1px solid var(--line); border-left: 4px solid var(--warn); border-radius: 0 10px 10px 0; background: var(--surface); }
.cta .cta-label { display: block; font-size: 11.5px; letter-spacing: .1em; font-weight: 700; color: var(--ink-3); margin-bottom: 6px; }
.cta p { margin: 0 0 10px; font-size: 15px; }
.cta a.cta-btn { display: inline-block; padding: 10px 16px; border-radius: 8px; background: var(--accent); color: #f6f7f5; font-weight: 700; text-decoration: none; font-size: 14.5px; }
.cta a.cta-btn:hover { filter: brightness(1.08); }
.cta .cta-sub { margin: 8px 0 0; font-size: 12.5px; color: var(--ink-3); }

/* card tags */
.card-tags { margin: 8px 0 0; }
.card-tags .tag { font-size: 11px; padding: 1px 8px; }
/* callout body spacing */
.stumble, .fix, .note { line-height: 1.85; }
.stumble ol, .fix ol, .note ol, .stumble ul, .fix ul, .note ul { margin: 6px 0 0; padding-left: 1.4em; }
@media (max-width: 520px) {
  body { font-size: 16px; }
  .prose h2 { font-size: 20px; margin-top: 44px; }
}