:root {
  --navy: #102442;
  --navy2: #163050;
  --gold: #d9a441;
  --ink: #1c2430;
  --grey: #5c6775;
  --bg: #f7f8fa;
  --card: #ffffff;
  --line: #e3e7ed;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: "Noto Serif TC", "Songti TC", "Hiragino Mincho ProN", serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.9;
  -webkit-font-smoothing: antialiased;
}

/* Header */
header {
  background: var(--navy);
  color: #fff;
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 2px solid var(--gold);
}
.header-inner {
  max-width: 980px;
  margin: 0 auto;
  padding: 14px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}
.brand { font-size: 1.15rem; font-weight: 700; letter-spacing: .04em; }
.brand a { color: #fff; text-decoration: none; }
.brand .sub { color: var(--gold); font-size: .78rem; display: block; font-weight: 400; }
nav a {
  color: #e8ecf2;
  text-decoration: none;
  font-size: .9rem;
  margin-left: 18px;
}
nav a:hover { color: var(--gold); }

/* Hero */
.hero {
  background: linear-gradient(160deg, var(--navy) 0%, var(--navy2) 100%);
  color: #fff;
  text-align: center;
  padding: 72px 20px 64px;
}
.hero h1 { font-size: 1.9rem; letter-spacing: .06em; line-height: 1.6; }
.hero h1 .gold { color: var(--gold); }
.hero p.lead { margin-top: 18px; color: #c9d3e0; font-size: 1rem; }
.hero .cta {
  display: inline-block;
  margin-top: 30px;
  background: var(--gold);
  color: var(--navy);
  font-weight: 700;
  padding: 12px 34px;
  border-radius: 999px;
  text-decoration: none;
  letter-spacing: .08em;
}
.hero .cta:hover { opacity: .9; }

/* Layout */
main { max-width: 980px; margin: 0 auto; padding: 48px 20px 80px; }
.section-title {
  font-size: 1.3rem;
  color: var(--navy);
  border-left: 5px solid var(--gold);
  padding-left: 12px;
  margin: 44px 0 22px;
  letter-spacing: .05em;
}
.section-title:first-child { margin-top: 0; }

/* Article cards */
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 18px; }
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 22px 22px 18px;
  text-decoration: none;
  color: var(--ink);
  display: flex;
  flex-direction: column;
  transition: box-shadow .2s, transform .2s;
}
.card:hover { box-shadow: 0 6px 20px rgba(16,36,66,.12); transform: translateY(-2px); }
.card .cat {
  font-size: .72rem;
  color: var(--gold);
  font-weight: 700;
  letter-spacing: .1em;
  margin-bottom: 8px;
}
.card h3 { font-size: 1.02rem; line-height: 1.6; color: var(--navy); }
.card p { font-size: .85rem; color: var(--grey); margin-top: 10px; flex: 1; }
.card .date { font-size: .75rem; color: #9aa4b0; margin-top: 12px; }

/* Article page */
article.post { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 44px 46px; }
article.post .cat { color: var(--gold); font-weight: 700; font-size: .8rem; letter-spacing: .1em; }
article.post h1 { font-size: 1.55rem; color: var(--navy); line-height: 1.6; margin: 10px 0 6px; }
article.post .date { color: #9aa4b0; font-size: .82rem; margin-bottom: 28px; }
article.post h2 {
  font-size: 1.12rem;
  color: var(--navy);
  margin: 34px 0 14px;
  padding-left: 10px;
  border-left: 4px solid var(--gold);
}
article.post p { margin: 14px 0; }
article.post ul, article.post ol { margin: 14px 0 14px 1.6em; }
article.post li { margin: 6px 0; }
article.post blockquote {
  background: #f2f5f9;
  border-left: 4px solid var(--navy);
  padding: 14px 18px;
  margin: 18px 0;
  border-radius: 0 8px 8px 0;
  color: #333;
}
.case-box {
  background: #fdf8ee;
  border: 1px solid #ecd9ad;
  border-left: 5px solid var(--gold);
  border-radius: 0 10px 10px 0;
  padding: 16px 20px;
  margin: 20px 0;
  font-size: .92rem;
}
.case-box .label {
  display: inline-block;
  background: var(--gold);
  color: #102442;
  font-weight: 700;
  font-size: .76rem;
  letter-spacing: .08em;
  padding: 1px 12px;
  border-radius: 999px;
  margin-bottom: 6px;
}
.related {
  background: #f2f5f9;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 16px 20px;
  margin-top: 36px;
  font-size: .92rem;
}
.related .label { color: var(--navy); font-weight: 700; font-size: .8rem; letter-spacing: .08em; margin-bottom: 6px; }
.related ul { margin: 0 0 0 1.4em; }
.related li { margin: 4px 0; }
.related a { color: var(--navy); }
.related a:hover { color: var(--gold); }
.post-footer {
  margin-top: 40px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
  font-size: .9rem;
  color: var(--grey);
}
.back { display: inline-block; margin-top: 26px; color: var(--navy); font-size: .9rem; }

/* About */
.profile { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 40px 44px; }
.profile h2 { color: var(--navy); font-size: 1.2rem; margin: 26px 0 12px; }
.profile h2:first-child { margin-top: 0; }
.profile table { border-collapse: collapse; width: 100%; font-size: .92rem; margin-top: 8px; }
.profile td { padding: 8px 10px; border-bottom: 1px solid var(--line); vertical-align: top; }
.profile td:first-child { color: var(--grey); white-space: nowrap; width: 9em; }

/* Contact */
.contact-box {
  background: var(--navy);
  color: #fff;
  border-radius: 14px;
  padding: 44px 30px;
  text-align: center;
  margin-top: 56px;
}
.contact-box h2 { font-size: 1.3rem; letter-spacing: .06em; }
.contact-box p { color: #c9d3e0; margin-top: 12px; font-size: .95rem; }
.contact-box a.mail {
  display: inline-block;
  margin-top: 22px;
  background: var(--gold);
  color: var(--navy);
  font-weight: 700;
  padding: 12px 36px;
  border-radius: 999px;
  text-decoration: none;
}
.contact-box .note { font-size: .8rem; color: #9db0c8; margin-top: 16px; }

/* Footer */
footer {
  background: var(--navy);
  color: #9db0c8;
  text-align: center;
  padding: 28px 20px;
  font-size: .8rem;
}
footer a { color: #c9d3e0; text-decoration: none; margin: 0 8px; }
footer a:hover { color: var(--gold); }

/* Disclaimer */
.disclaimer { font-size: .78rem; color: #9aa4b0; margin-top: 30px; }

/* Profile photo */
.profile-photo {
  display: block;
  width: 200px;
  max-width: 60%;
  border-radius: 8px;
  margin: 0 auto 24px;
  border: 1px solid var(--line);
}

/* YouTube images */
.yt-links { display: flex; gap: 16px; flex-wrap: wrap; margin-top: 8px; }
.yt-links a { flex: 1 1 260px; max-width: 360px; }
.yt-img { width: 100%; border-radius: 8px; border: 1px solid var(--line); display: block; transition: opacity .2s; }
.yt-links a:hover .yt-img { opacity: .85; }

/* Language switch */
nav a.lang-switch {
  border: 1px solid var(--gold);
  border-radius: 4px;
  padding: 2px 10px;
  color: var(--gold);
}
nav a.lang-switch:hover { background: var(--gold); color: var(--navy); }
.lang-note { font-size: .85rem; margin: 10px 0 4px; }
.lang-note a { color: var(--grey); text-decoration: underline; }
.lang-note a:hover { color: var(--gold); }

/* Header search */
.header-search { margin: 0; }
.header-search input {
  width: 150px;
  padding: 5px 12px;
  font-size: .85rem;
  font-family: inherit;
  border: 1px solid rgba(255, 255, 255, .35);
  border-radius: 999px;
  background: rgba(255, 255, 255, .08);
  color: #fff;
  transition: border-color .2s, width .2s;
}
.header-search input::placeholder { color: #aab4c4; }
.header-search input:focus { outline: none; border-color: var(--gold); width: 190px; }

@media (max-width: 640px) {
  .hero h1 { font-size: 1.4rem; }
  article.post { padding: 30px 22px; }
  .profile { padding: 28px 22px; }
  nav a { margin-left: 12px; font-size: .82rem; }
  .header-search { width: 100%; }
  .header-search input, .header-search input:focus { width: 100%; }
}

/* Category nav */
.catnav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0 0 26px;
}
.catnav a {
  display: inline-block;
  padding: 7px 16px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--card);
  color: var(--navy);
  font-size: .85rem;
  font-weight: 600;
  text-decoration: none;
  transition: border-color .2s, color .2s;
}
.catnav a:hover { border-color: var(--gold); color: var(--gold); }
.catnav a.active { background: var(--navy); border-color: var(--navy); color: #fff; }
article.post .cat a { color: var(--gold); text-decoration: none; }
article.post .cat a:hover { text-decoration: underline; }
.searchbox { max-width: 560px; margin: 0 auto 1.6rem; }
.searchbox input {
  width: 100%;
  padding: .7rem 1rem;
  font-size: 1rem;
  font-family: inherit;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--card);
  color: var(--ink);
}
.searchbox input:focus { outline: none; border-color: var(--gold); }
.search-empty { text-align: center; color: var(--grey); margin-top: .8rem; }

/* Font size switcher */
.fontsize { display: flex; align-items: center; gap: 4px; }
.fs-label { color: #9db0c8; font-size: .72rem; }
.fontsize button {
  background: transparent;
  border: 1px solid rgba(255,255,255,.35);
  color: #c9d3e0;
  border-radius: 4px;
  cursor: pointer;
  padding: 2px 7px;
  font-size: .72rem;
  font-family: inherit;
  line-height: 1.4;
}
.fontsize button:hover { border-color: var(--gold); color: var(--gold); }
.fontsize button.active {
  background: var(--gold);
  border-color: var(--gold);
  color: #102442;
  font-weight: 700;
}

/* Language-specific serif headings/body (ja pages load Noto Serif JP) */
html[lang="ja"] body { font-family: "Noto Serif JP", "Hiragino Mincho ProN", "Yu Mincho", serif; }

/* Theme toggle button */
.fontsize .theme-toggle { margin-left: 6px; border-radius: 999px; font-size: .8rem; padding: 2px 8px; }

/* Category colors (8 color groups across 18 categories) */
.catc-saiyo, .catc-jinji { --catc: #2f6f8f; }
.catc-chingin, .catc-shaho, .catc-zeikin { --catc: #a07820; }
.catc-jikan, .catc-kyuka { --catc: #4e7f4e; }
.catc-kaiko, .catc-chokai, .catc-funso { --catc: #a04040; }
.catc-harassment, .catc-rosai { --catc: #b05c2a; }
.catc-keiei, .catc-joho { --catc: #50608f; }
.catc-visa, .catc-gaikokujin { --catc: #3f7f7f; }
.catc-fudosan, .catc-seikatsu { --catc: #6f5a8f; }
.card { border-top: 4px solid var(--catc, var(--line)); }
.card .cat { color: var(--catc, var(--gold)); }
.card .cat::before, article.post .cat::before {
  content: "";
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--catc, var(--gold));
  margin-right: 6px;
  vertical-align: 1px;
}
article.post { border-top: 5px solid var(--catc, var(--gold)); }
article.post .cat a, article.post .cat { color: var(--catc, var(--gold)); }

/* TL;DR box */
.tldr {
  background: #fbf6ea;
  border-left: 5px solid var(--gold);
  border-radius: 0 10px 10px 0;
  padding: 14px 18px 12px;
  margin: 4px 0 26px;
  font-size: .95rem;
}
.tldr-label {
  display: inline-block;
  background: var(--gold);
  color: #102442;
  font-weight: 700;
  font-size: .76rem;
  letter-spacing: .08em;
  padding: 1px 12px;
  border-radius: 999px;
}
.tldr p { margin: 8px 0 0; }

/* Table of contents */
.toc {
  background: #f2f5f9;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 14px 20px;
  margin: 0 0 26px;
  font-size: .9rem;
}
.toc .label { color: var(--navy); font-weight: 700; font-size: .8rem; letter-spacing: .08em; }
.toc ol { margin: 6px 0 0 1.5em; }
.toc li { margin: 3px 0; }
.toc a { color: var(--navy); text-decoration: none; }
.toc a:hover { color: var(--gold); text-decoration: underline; }

/* Dark mode */
[data-theme="dark"] {
  --ink: #d8dfe9;
  --grey: #9aa8b8;
  --bg: #121a26;
  --card: #1a2433;
  --line: #2c3a4e;
}
[data-theme="dark"] body { background: var(--bg); color: var(--ink); }
[data-theme="dark"] .card h3,
[data-theme="dark"] article.post h1,
[data-theme="dark"] article.post h2,
[data-theme="dark"] article.post h3,
[data-theme="dark"] .section-title,
[data-theme="dark"] .profile h2,
[data-theme="dark"] .toc .label { color: #dfe7f2; }
[data-theme="dark"] article.post blockquote { background: #1f2a3b; color: #cfd8e4; border-left-color: var(--gold); }
[data-theme="dark"] .case-box { background: #26200f; border-color: #54461f; }
[data-theme="dark"] .tldr { background: #26200f; }
[data-theme="dark"] .related, [data-theme="dark"] .toc { background: #1f2a3b; }
[data-theme="dark"] .related .label, [data-theme="dark"] .related a, [data-theme="dark"] .toc a { color: #c9d3e0; }
[data-theme="dark"] .related a:hover, [data-theme="dark"] .toc a:hover { color: var(--gold); }
[data-theme="dark"] .catnav a { color: #c9d3e0; }
[data-theme="dark"] .catnav a.active { background: var(--gold); border-color: var(--gold); color: #102442; }
[data-theme="dark"] .back { color: #c9d3e0; }
[data-theme="dark"] .lang-note a { color: var(--grey); }
[data-theme="dark"] .card:hover { box-shadow: 0 6px 20px rgba(0,0,0,.5); }