:root {
  --bg: #0f1115;
  --panel: #161923;
  --panel-2: #1d212e;
  --text: #e6e8ee;
  --muted: #9aa1b2;
  --accent: #f4b942;
  --accent-2: #35c48f;
  --danger: #ef6461;
  --info: #4a9eda;
  --border: #2a2f3d;
  --code-bg: #10131a;
  --radius: 10px;
  --maxw: 1100px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: "Hiragino Kaku Gothic ProN", "Yu Gothic", "Noto Sans JP", system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.8;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(15, 17, 21, 0.92);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--border);
}

.site-header .inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 14px 20px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 16px;
}

.brand {
  order: 1;
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 8px;
  flex: none;
}
.brand .tux { color: var(--accent); }

.brand:hover { text-decoration: none; }

.site-search {
  order: 2;
  position: relative;
  flex: 0 1 340px;
  max-width: 420px;
  margin-left: auto;
}
.site-search input[type="search"] {
  width: 100%;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 9px 12px;
  color: var(--text);
  font-size: 0.88rem;
  outline: none;
  box-sizing: border-box;
}
.site-search input[type="search"]:focus { border-color: var(--accent); }
.site-search input[type="search"]::placeholder { color: var(--muted); }

.search-results {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  right: 0;
  z-index: 30;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.4);
  max-height: 70vh;
  overflow-y: auto;
  padding: 6px;
}
.search-result-item {
  display: block;
  padding: 10px 10px;
  border-radius: 8px;
  color: var(--text);
}
.search-result-item + .search-result-item { margin-top: 2px; }
.search-result-item:hover { background: var(--panel-2); text-decoration: none; }
.search-result-level {
  display: inline-block;
  font-size: 0.68rem;
  font-weight: 700;
  color: var(--accent-2);
  border: 1px solid rgba(53, 196, 143, 0.4);
  background: rgba(53, 196, 143, 0.12);
  border-radius: 999px;
  padding: 1px 8px;
  margin-right: 6px;
  vertical-align: middle;
}
.search-result-title {
  font-weight: 700;
  font-size: 0.92rem;
  vertical-align: middle;
}
.search-result-snippet {
  display: block;
  margin-top: 4px;
  font-size: 0.8rem;
  color: var(--muted);
  line-height: 1.5;
}
.search-result-snippet mark {
  background: rgba(244, 185, 66, 0.35);
  color: var(--text);
  border-radius: 3px;
  padding: 0 2px;
}
.search-empty {
  padding: 14px 12px;
  font-size: 0.85rem;
  color: var(--muted);
}

.nav-toggle {
  order: 3;
  display: none;
  background: var(--panel-2);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 8px;
  padding: 8px 12px;
  font-size: 0.95rem;
  cursor: pointer;
}

.layout {
  max-width: var(--maxw);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 250px 1fr;
  gap: 32px;
  padding: 28px 20px 80px;
  align-items: start;
}

.sidebar {
  position: sticky;
  top: 66px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  max-height: calc(100vh - 90px);
  overflow-y: auto;
}

.level-tabs {
  display: flex;
  gap: 6px;
  margin-bottom: 14px;
}
.level-tab {
  flex: 1;
  text-align: center;
  padding: 8px 4px;
  border-radius: 8px;
  background: var(--panel-2);
  border: 1px solid var(--border);
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--text);
}
.level-tab:hover { border-color: var(--accent); text-decoration: none; }
.level-tab.active {
  background: rgba(244, 185, 66, 0.15);
  border-color: var(--accent);
  color: var(--accent);
}
.level-tab.disabled {
  color: var(--muted);
  cursor: default;
  display: flex;
  flex-direction: column;
  align-items: center;
  line-height: 1.3;
}
/* AWSタブ（英字ラベル）のみ、初級/中級/上級（2文字で自然に2行へ折り返す）と
   縦横のバランスを合わせるため縦書きにする。スマホ表示（サイドバーが全幅に
   なり、そもそも折り返しが起きない幅）には適用しないよう、デスクトップ幅の
   サイドバー（.layout が2カラムになる821px以上）でのみ有効にする。
   初級/中級/上級タブ自体のスタイルは変更しない。 */
@media (min-width: 821px) {
  .level-tab.level-tab-vertical-en {
    writing-mode: vertical-rl;
    text-orientation: upright;
    display: flex;
    align-items: center;
    justify-content: center;
  }
}
.level-tab.disabled small { font-size: 0.65rem; }

.sidebar h2 {
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  color: var(--muted);
  text-transform: uppercase;
  margin: 4px 4px 10px;
}
.level-sub {
  text-transform: none;
  letter-spacing: normal;
  color: var(--accent-2);
  font-size: 0.72rem;
  font-weight: 700;
}

.sidebar ol {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: ch;
}

.sidebar li { counter-increment: ch; margin-bottom: 2px; }

.sidebar a {
  display: flex;
  gap: 10px;
  align-items: baseline;
  padding: 8px 10px;
  border-radius: 8px;
  color: var(--text);
  font-size: 0.92rem;
}

.sidebar a::before {
  content: counter(ch);
  flex: none;
  width: 20px;
  height: 20px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.72rem;
  border-radius: 50%;
  background: var(--panel-2);
  color: var(--muted);
  border: 1px solid var(--border);
}

.sidebar a:hover { background: var(--panel-2); text-decoration: none; }

.sidebar a.active {
  background: rgba(244, 185, 66, 0.12);
  color: var(--accent);
  font-weight: 700;
}
.sidebar a.active::before {
  background: var(--accent);
  color: #17140a;
  border-color: var(--accent);
}
.sidebar a.done::after {
  content: "✓";
  margin-left: auto;
  color: var(--accent-2);
  font-weight: 700;
}

/* レベルタブ・サイトトップリンクは章一覧の連番カウンター対象外のため、
   ::before の番号バッジ（0）を表示しない */
.sidebar .level-tab::before,
.sidebar .home-link a::before {
  content: none;
}

main { min-width: 0; }

.hero {
  background: linear-gradient(135deg, rgba(244,185,66,0.12), rgba(53,196,143,0.08));
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 40px 32px;
  margin-bottom: 32px;
}
.hero h1 { margin: 0 0 12px; font-size: 1.9rem; }
.hero p { color: var(--muted); max-width: 60ch; margin: 0 0 20px; }
.hero .cta { display: inline-flex; gap: 10px; }

.btn {
  display: inline-block;
  padding: 10px 18px;
  border-radius: 8px;
  background: var(--accent);
  color: #17140a;
  font-weight: 700;
  border: none;
  cursor: pointer;
}
.btn:hover { text-decoration: none; opacity: 0.9; }
.btn.secondary {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}
.hero-note {
  margin: 14px 0 0;
  font-size: 0.8rem;
  color: var(--muted);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(230px, 1fr));
  gap: 14px;
  margin: 24px 0 8px;
}

.card {
  position: relative;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 18px;
  transition: border-color 0.15s;
}
.card:hover { border-color: var(--accent); text-decoration: none; }
.card .num { color: var(--accent); font-size: 0.78rem; font-weight: 700; letter-spacing: 0.05em; }
.card h3 { margin: 6px 0 6px; font-size: 1.02rem; color: var(--text); }
/* トラブルシューティング一覧（troubleshooting.html）のみ、見出し階層上h1の次はh2にしている
   （h3ではなく）ため、見た目は上の .card h3 と揃えつつ、こちらはh2に対して指定する。 */
.ts-articles-grid .card h2 { margin: 6px 0 6px; font-size: 1.02rem; color: var(--text); }
.card p { margin: 0; font-size: 0.86rem; color: var(--muted); }

.card-done-badge {
  position: absolute;
  top: 12px;
  right: 14px;
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--accent-2);
  background: rgba(53, 196, 143, 0.12);
  padding: 2px 9px;
  border-radius: 999px;
}
.card.done { border-color: var(--accent-2); }

.level-grid { grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); }
.level-card { padding: 20px; }
.level-card h3 { font-size: 1.1rem; }
.level-card p { font-size: 0.88rem; line-height: 1.6; }
.disabled-card {
  opacity: 0.55;
  cursor: default;
}
.disabled-card:hover { border-color: var(--border); }

.lpic-badge {
  display: inline-block;
  margin: 0 0 12px;
  padding: 4px 10px;
  border-radius: 999px;
  background: rgba(53, 196, 143, 0.14);
  color: var(--accent-2);
  border: 1px solid rgba(53, 196, 143, 0.4);
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

article h1 { font-size: 1.7rem; margin-top: 0; }
article h2 {
  font-size: 1.25rem;
  margin-top: 2.2em;
  padding-top: 0.4em;
  border-top: 1px solid var(--border);
}
article h2:first-of-type { border-top: none; padding-top: 0; margin-top: 1.4em; }
article h3 { font-size: 1.05rem; color: var(--accent); }

.lead {
  color: var(--muted);
  font-size: 1.02rem;
}

.callout {
  border-left: 4px solid var(--accent);
  background: var(--panel);
  border-radius: 0 8px 8px 0;
  padding: 12px 16px;
  margin: 18px 0;
  font-size: 0.94rem;
}
.callout.tip { border-color: var(--accent-2); }
.callout.warn { border-color: var(--danger); }
.callout strong { color: var(--accent); }
.callout.tip strong { color: var(--accent-2); }
.callout.warn strong { color: var(--danger); }

.exam-countdown {
  margin: 18px 0;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 20px;
}
.exam-countdown-setup label {
  display: block;
  color: var(--muted);
  font-size: 0.92rem;
  margin-bottom: 10px;
}
.exam-countdown-input {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  padding: 6px 10px;
  margin-right: 10px;
  font-size: 0.95rem;
}
.exam-countdown-days {
  margin: 0 0 10px;
  line-height: 1.5;
}
.exam-countdown-target {
  display: block;
  font-size: 0.98rem;
  font-weight: 500;
  color: var(--text);
}
.exam-countdown-remain {
  display: block;
  margin-top: 4px;
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--accent);
}
.exam-countdown-clear {
  background: none;
  border: none;
  color: var(--muted);
  text-decoration: underline;
  cursor: pointer;
  font-size: 0.85rem;
  padding: 0;
}
.exam-countdown-clear:hover { color: var(--text); }

.diagram-figure {
  margin: 28px 0;
  padding: 20px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  text-align: center;
}
.diagram-figure svg {
  width: 100%;
  height: auto;
  display: block;
}
.diagram-figure figcaption {
  margin-top: 14px;
  color: var(--muted);
  font-size: 0.9em;
  line-height: 1.6;
  text-align: left;
}

.faq-item {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 16px;
  margin: 10px 0;
  background: var(--panel);
}
.faq-item summary {
  cursor: pointer;
  font-weight: 700;
  color: var(--text);
  list-style: none;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::before {
  content: "▶";
  display: inline-block;
  margin-right: 8px;
  font-size: 0.7em;
  color: var(--accent-2);
}
.faq-item[open] summary::before { transform: rotate(90deg); display: inline-block; }
.faq-item p { margin: 10px 0 0; color: var(--muted); line-height: 1.7; }

.contact-form {
  max-width: 560px;
  margin-top: 20px;
}
.form-field { margin-bottom: 18px; }
.form-field label {
  display: block;
  font-weight: 700;
  font-size: 0.9rem;
  margin-bottom: 6px;
}
.form-field .optional { color: var(--muted); font-weight: 400; font-size: 0.78rem; margin-left: 4px; }
.form-field .required { color: var(--danger); font-weight: 400; font-size: 0.78rem; margin-left: 4px; }
.contact-form input[type="text"],
.contact-form input[type="email"],
.contact-form select,
.contact-form textarea {
  width: 100%;
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 12px;
  color: var(--text);
  font-size: 0.92rem;
  font-family: inherit;
  box-sizing: border-box;
}
.contact-form input[type="text"]:focus,
.contact-form input[type="email"]:focus,
.contact-form select:focus,
.contact-form textarea:focus {
  outline: none;
  border-color: var(--accent);
}
.contact-form textarea { resize: vertical; }
.form-note {
  margin-top: 14px;
  font-size: 0.85rem;
  color: var(--muted);
}

pre {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px 16px;
  overflow-x: auto;
  font-size: 0.88rem;
  line-height: 1.6;
}
code {
  font-family: "SFMono-Regular", Menlo, Consolas, monospace;
  background: var(--code-bg);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.88em;
}
pre code { background: none; padding: 0; }

.prompt { color: var(--accent-2); }
.comment { color: var(--muted); }

table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0;
  font-size: 0.9rem;
}
th, td {
  border: 1px solid var(--border);
  padding: 8px 12px;
  text-align: left;
}
th { background: var(--panel); color: var(--accent); }
td code { white-space: nowrap; }

.quiz {
  margin-top: 40px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px 24px;
}
.quiz > h2 { margin-top: 0; border: none; padding: 0; }
.quiz summary h2 { margin-top: 0; border: none; padding: 0; display: inline; }
.quiz-question {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px 16px;
  margin-bottom: 14px;
  background: var(--panel-2);
}
.quiz-question.correct { border-color: var(--accent-2); }
.quiz-question.incorrect { border-color: var(--danger); }
.quiz-q { font-weight: 700; margin: 0 0 10px; }
.quiz-question label {
  display: block;
  padding: 6px 8px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.92rem;
}
.quiz-question label:hover { background: rgba(255,255,255,0.04); }
.quiz-question input { margin-right: 8px; }
.quiz-feedback { font-size: 0.86rem; margin-top: 8px; color: var(--muted); min-height: 1.2em; }
.quiz-question.correct .quiz-feedback { color: var(--accent-2); }
.quiz-question.incorrect .quiz-feedback { color: var(--danger); }
.quiz-result {
  display: none;
  margin-top: 6px;
  font-weight: 700;
  color: var(--accent);
}
.quiz-explain {
  display: none;
  font-size: 0.85rem;
  color: var(--muted);
  margin-top: 8px;
  padding-top: 8px;
  border-top: 1px dashed var(--border);
}
.quiz-question.graded .quiz-explain { display: block; }
.quiz-explain strong { color: var(--accent-2); }

.cmdq-input-label {
  display: block;
  margin-top: 4px;
  font-size: 0.8rem;
  color: var(--muted);
  font-weight: 700;
}
.cmdq-input {
  display: block;
  width: 100%;
  max-width: 320px;
  margin-top: 6px;
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 8px 10px;
  color: var(--text);
  font-family: "SFMono-Regular", Menlo, Consolas, monospace;
  font-size: 0.95rem;
}
.cmdq-input:focus { outline: none; border-color: var(--accent); }
.quiz-question.correct .cmdq-input { border-color: var(--accent-2); }
.quiz-question.incorrect .cmdq-input { border-color: var(--danger); }
.cmdq-reveal-btn {
  margin-top: 10px;
  font-size: 0.8rem;
  padding: 6px 12px;
}
.cmdq-answer {
  margin: 8px 0 0;
  padding: 8px 12px;
  border-radius: 6px;
  background: rgba(244, 185, 66, 0.12);
  border: 1px solid rgba(244, 185, 66, 0.4);
  color: var(--accent);
  font-size: 0.86rem;
  font-weight: 700;
}
.cmdq-ref {
  font-size: 0.76rem;
  color: var(--muted);
  margin: 8px 0 0;
}
.cmdq-summary {
  margin: 32px 0 8px;
  padding: 16px 20px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.complete-toggle { margin: 28px 0 8px; }
.complete-btn {
  background: var(--panel-2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 16px;
  font-size: 0.9rem;
  cursor: pointer;
  font-weight: 700;
}
.complete-btn:hover { border-color: var(--accent-2); }
.complete-btn.done {
  background: rgba(53, 196, 143, 0.15);
  border-color: var(--accent-2);
  color: var(--accent-2);
}

.progress-bar {
  width: 100%;
  height: 10px;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 999px;
  overflow: hidden;
  margin-top: 6px;
}
.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent-2), var(--accent));
  width: 0%;
  transition: width 0.3s ease;
}
.progress-text { margin: 8px 0 12px; color: var(--muted); font-size: 0.9rem; }
#progress-summary .btn.secondary { font-size: 0.8rem; padding: 7px 12px; }

.page-nav {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-top: 44px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  font-size: 0.9rem;
}
.page-nav a {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 14px;
  color: var(--text);
  max-width: 46%;
}
.page-nav a:hover { border-color: var(--accent); text-decoration: none; }
.page-nav .dir { display: block; font-size: 0.72rem; color: var(--muted); margin-bottom: 2px; }
.page-nav .next { text-align: right; margin-left: auto; }

.site-footer {
  text-align: center;
  color: var(--muted);
  font-size: 0.82rem;
  padding: 28px 20px 50px;
}
.site-footer p { margin: 0 0 10px; }
.trademark-notice { font-size: 0.75rem; opacity: 0.8; margin-top: 10px; }
.footer-links {
  display: flex;
  justify-content: center;
  gap: 18px;
  flex-wrap: wrap;
}
.footer-links a {
  color: var(--muted);
  font-size: 0.8rem;
  text-decoration: none;
}
.footer-links a:hover { color: var(--accent); text-decoration: underline; }

.sidebar .cmd-link {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--border);
}
.sidebar .quiz-link {
  margin-top: 6px;
}
.sidebar .term-link {
  margin-top: 6px;
}
.sidebar .ts-link {
  margin-top: 6px;
}
.sidebar .glossary-link {
  margin-top: 6px;
}
.sidebar .err-link {
  margin-top: 6px;
}
.sidebar .cmd-link a,
.sidebar .quiz-link a,
.sidebar .term-link a,
.sidebar .ts-link a,
.sidebar .glossary-link a,
.sidebar .err-link a {
  color: var(--accent-2);
  font-weight: 700;
}
.sidebar .cmd-link a::before,
.sidebar .quiz-link a::before,
.sidebar .term-link a::before,
.sidebar .ts-link a::before,
.sidebar .glossary-link a::before,
.sidebar .err-link a::before {
  background: none;
  border: none;
  width: auto;
  height: auto;
  border-radius: 0;
}
.sidebar .cmd-link a::before { content: "📖 "; }
.sidebar .quiz-link a::before { content: "✍️ "; }
.sidebar .term-link a::before { content: "🖥 "; }
.sidebar .ts-link a::before { content: "🛠 "; }
.sidebar .glossary-link a::before { content: "📚 "; }
.sidebar .err-link a::before { content: "🚧 "; }

.cmd-table td:first-child { white-space: nowrap; font-weight: 700; }
.cmd-table td:last-child { white-space: nowrap; color: var(--muted); font-size: 0.85em; }
@media (max-width: 600px) {
  .cmd-table { font-size: 0.82rem; }
  .cmd-table td:last-child { white-space: normal; }
}

.cmd-toc {
  margin-top: 18px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 4px 24px 20px;
}
.cmd-toc h2 { font-size: 1.05rem; margin-bottom: 6px; }
.cmd-toc ol {
  columns: 2;
  column-gap: 24px;
  margin: 0;
  padding-left: 1.2em;
}
.cmd-toc li { break-inside: avoid; margin: 4px 0; }
.cmd-toc a { color: var(--accent); text-decoration: none; }
.cmd-toc a:hover { text-decoration: underline; }
.cmd-toc-ops-label { margin: 16px 0 4px; font-weight: 700; color: var(--muted); }
@media (max-width: 600px) {
  .cmd-toc ol { columns: 1; }
}

.cmd-category,
.cmdq-category,
.glossary-category {
  margin-top: 18px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 4px 24px 22px;
}
.cmd-category > summary,
.cmdq-category > summary,
.glossary-category > summary {
  cursor: pointer;
  padding: 14px 0;
  list-style: none;
}
.cmd-category > summary::-webkit-details-marker,
.cmdq-category > summary::-webkit-details-marker,
.glossary-category > summary::-webkit-details-marker {
  display: none;
}
.cmd-category > summary::before,
.cmdq-category > summary::before,
.glossary-category > summary::before {
  content: "▶";
  display: inline-block;
  margin-right: 10px;
  font-size: 0.7em;
  color: var(--accent-2);
  transition: transform 0.15s ease;
}
.cmd-category[open] > summary::before,
.cmdq-category[open] > summary::before,
.glossary-category[open] > summary::before {
  transform: rotate(90deg);
}
.cmd-category > summary h2,
.cmdq-category > summary h2,
.glossary-category > summary h2 {
  display: inline;
}
.cmd-category table { margin-top: 4px; }

/* 検索結果からジャンプしてきたコマンド行を一時的にハイライトする */
.cmd-row-highlight > td {
  animation: cmd-row-flash 2.5s ease;
}
/* 課題モードの「関連するコマンド」リンクなど、カテゴリ単位でジャンプしてきた場合の
   一時ハイライト（対象の<details>自体にクラスが付くので、summaryを光らせる） */
.cmd-category-highlight > summary {
  animation: cmd-row-flash 2.5s ease;
}
@keyframes cmd-row-flash {
  0% { background: rgba(244, 185, 66, 0.35); }
  70% { background: rgba(244, 185, 66, 0.35); }
  100% { background: transparent; }
}

.glossary-search {
  position: relative;
  margin: 18px 0 22px;
}
.glossary-search input[type="text"] {
  width: 100%;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 11px 14px;
  color: var(--text);
  font-size: 0.95rem;
  font-family: inherit;
  box-sizing: border-box;
  outline: none;
}
.glossary-search input[type="text"]:focus { border-color: var(--accent); }
.glossary-search input[type="text"]::placeholder { color: var(--muted); }
.glossary-search-count {
  margin: 8px 2px 0;
  font-size: 0.84rem;
  color: var(--muted);
}

.glossary-term {
  padding: 12px 0;
  border-top: 1px solid var(--border);
}
.glossary-term:first-of-type { border-top: none; padding-top: 4px; }
.glossary-term-name {
  margin: 0 0 4px;
  font-size: 1rem;
  color: var(--accent);
}
.glossary-term-def {
  margin: 0;
  color: var(--muted);
  line-height: 1.7;
  font-size: 0.92rem;
}
.glossary-term-ref {
  display: block;
  margin-top: 6px;
  font-size: 0.8rem;
  color: var(--text);
  opacity: 0.7;
}
mark.glossary-highlight {
  background: rgba(53, 196, 143, 0.35);
  color: inherit;
  border-radius: 3px;
  padding: 0 1px;
}

.cmd-name-btn {
  display: inline-block;
  background: none;
  border: none;
  padding: 2px 0;
  cursor: pointer;
  font: inherit;
  color: var(--text);
  text-align: left;
  border-radius: 2px;
}
.cmd-name-btn code {
  pointer-events: none;
  color: var(--text);
}
.cmd-name-btn:hover code {
  text-decoration: underline;
  text-underline-offset: 3px;
}
.cmd-example-row td {
  padding: 0 0 12px;
  border-bottom: 1px solid var(--border);
}
.cmd-example-output {
  margin: 4px 0 0;
  padding: 10px 14px;
  background: #0a0c10;
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent-2);
  border-radius: 6px;
  color: var(--text);
  font-family: "SFMono-Regular", Menlo, Consolas, monospace;
  font-size: 0.82rem;
  line-height: 1.6;
  white-space: pre-wrap;
  word-break: break-word;
}
.cmd-example-explain {
  margin: 10px 2px 0;
  padding: 0;
  color: var(--muted);
  font-size: 0.85rem;
  line-height: 1.7;
  white-space: normal;
}

.term-intro { margin-bottom: 18px; }
.term-wrap {
  background: #0a0c10;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
.term-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--panel-2);
  padding: 8px 14px;
  border-bottom: 1px solid var(--border);
  font-size: 0.82rem;
  color: var(--muted);
}
.term-toolbar button {
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 5px 10px;
  font-size: 0.8rem;
  cursor: pointer;
}
.term-toolbar button:hover { border-color: var(--accent); }
.terminal {
  height: 460px;
  display: flex;
  flex-direction: column;
  padding: 14px 16px;
  font-family: "SFMono-Regular", Menlo, Consolas, monospace;
  font-size: 0.88rem;
  color: #d7f7e3;
  cursor: text;
}
.term-output-wrap {
  flex: 1 1 auto;
  min-height: 0;
  overflow-y: auto;
  margin-bottom: 8px;
}
.term-line { white-space: pre-wrap; word-break: break-word; margin-bottom: 2px; }
.term-line.echo-line { color: #8fd3ff; }
.term-line.out-line { color: #d7f7e3; }
.term-line.sys-line { color: var(--muted); }
.term-line.warn-line { color: var(--danger); }
.term-input-line { display: flex; gap: 8px; align-items: center; flex: none; }
.term-prompt { color: var(--accent); white-space: nowrap; }
#term-input {
  flex: 1;
  min-width: 0;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 8px 10px;
  outline: none;
  color: #d7f7e3;
  font-family: inherit;
  font-size: inherit;
}
#term-input:focus { border-color: var(--accent); }
.term-controls {
  display: flex;
  gap: 8px;
  margin-top: 8px;
  flex: none;
}
.term-ctrl-btn {
  flex: 1;
  padding: 10px 8px;
  min-height: 42px;
  border-radius: 8px;
  background: var(--panel-2);
  border: 1px solid var(--border);
  color: var(--text);
  font-family: inherit;
  font-size: 0.85rem;
  font-weight: 700;
  cursor: pointer;
}
.term-ctrl-btn:active { background: var(--panel); }
.term-ctrl-send {
  background: var(--accent);
  color: #17140a;
  border-color: var(--accent);
}
.cmd-ref {
  margin-top: 18px;
  font-size: 0.85rem;
  color: var(--muted);
}

.mode-tabs {
  display: flex;
  gap: 8px;
  margin: 18px 0 16px;
}
.mode-tab {
  flex: 1;
  text-align: center;
  padding: 10px 12px;
  border-radius: 8px;
  background: var(--panel-2);
  border: 1px solid var(--border);
  color: var(--text);
  font-weight: 700;
  font-size: 0.92rem;
  cursor: pointer;
}
.mode-tab:hover { border-color: var(--accent); }
.mode-tab.active {
  background: rgba(244, 185, 66, 0.15);
  border-color: var(--accent);
  color: var(--accent);
}
.mode-panel { margin-bottom: 18px; }

.challenge-progress { margin: 4px 0 20px; }

.challenge-group-title {
  font-size: 0.95rem;
  color: var(--accent-2);
  margin: 20px 0 10px;
}
.challenge-group-title:first-child { margin-top: 0; }

.challenge-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 10px;
}
.challenge-card-btn {
  display: flex;
  align-items: center;
  gap: 10px;
  text-align: left;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px 14px;
  color: var(--text);
  font-family: inherit;
  cursor: pointer;
}
.challenge-card-btn:hover { border-color: var(--accent); }
.challenge-card-num {
  flex: none;
  width: 26px;
  height: 26px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--panel-2);
  color: var(--muted);
  border: 1px solid var(--border);
  font-size: 0.78rem;
  font-weight: 700;
}
.challenge-card-btn.done .challenge-card-num {
  background: var(--accent-2);
  color: #0c1712;
  border-color: var(--accent-2);
}
.challenge-card-title { font-size: 0.9rem; font-weight: 700; }
.challenge-card-btn.done .challenge-card-title { color: var(--accent-2); }

.challenge-back-btn { margin-bottom: 14px; }

.challenge-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
}
.challenge-card h2 { margin: 8px 0 10px; font-size: 1.15rem; }
.challenge-scenario { color: var(--muted); margin: 0 0 16px; font-size: 0.92rem; }

.challenge-step-box {
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 16px;
  margin-bottom: 14px;
}
.challenge-step-indicator {
  margin: 0 0 6px;
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  color: var(--accent);
  text-transform: uppercase;
}
.challenge-step-instruction {
  margin: 0;
  color: var(--text);
  font-size: 0.98rem;
  font-weight: 700;
}

.challenge-level-badge {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 999px;
  font-size: 0.74rem;
  font-weight: 700;
  background: var(--panel-2);
  border: 1px solid var(--border);
  color: var(--muted);
}
.challenge-level-badge.level-beginner { color: var(--accent-2); border-color: rgba(53,196,143,0.4); background: rgba(53,196,143,0.12); }
.challenge-level-badge.level-intermediate { color: var(--accent); border-color: rgba(244,185,66,0.4); background: rgba(244,185,66,0.12); }
.challenge-level-badge.level-advanced { color: var(--danger); border-color: rgba(220,90,90,0.4); background: rgba(220,90,90,0.12); }
.challenge-level-badge.level-ops-monitor,
.challenge-level-badge.level-ops-maintain,
.challenge-level-badge.level-ops-design { color: var(--info); border-color: rgba(74,158,218,0.4); background: rgba(74,158,218,0.12); }
.challenge-level-badge.level-aws { color: var(--accent); border-color: rgba(244,185,66,0.4); background: rgba(244,185,66,0.12); }

.challenge-hint {
  margin: 4px 0 16px;
  font-size: 0.88rem;
}
.challenge-hint summary {
  cursor: pointer;
  color: var(--accent-2);
  font-weight: 700;
}
.challenge-hint p { margin: 8px 0 0; color: var(--muted); }

.challenge-hint-box { margin: 4px 0 16px; }
.challenge-hint-btn { font-size: 0.82rem; padding: 6px 14px; }
.challenge-hint-list { margin-top: 8px; }
.challenge-hint-line {
  margin: 0 0 6px;
  padding: 8px 12px;
  border-radius: 8px;
  background: var(--panel-2);
  border: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.88rem;
}

.challenge-status {
  margin: 10px 0 14px;
  padding: 10px 14px;
  border-radius: 8px;
  background: var(--panel-2);
  border: 1px solid var(--border);
  font-size: 0.88rem;
}
.challenge-status.is-success {
  background: rgba(53, 196, 143, 0.14);
  border-color: var(--accent-2);
  color: var(--accent-2);
  font-weight: 700;
}
.challenge-status.is-note { color: var(--muted); }

.challenge-explain {
  margin: 0 0 14px;
  padding: 10px 14px;
  border-radius: 8px;
  border: 1px solid var(--accent-2);
  background: rgba(53, 196, 143, 0.08);
  font-size: 0.9rem;
}
.challenge-explain summary {
  cursor: pointer;
  color: var(--accent-2);
  font-weight: 700;
  list-style: none;
}
.challenge-explain summary::-webkit-details-marker { display: none; }
.challenge-explain summary::before {
  content: "▶";
  display: inline-block;
  margin-right: 8px;
  font-size: 0.7em;
}
.challenge-explain[open] summary::before { transform: rotate(90deg); display: inline-block; }
.challenge-explain p { margin: 10px 0 0; color: var(--text); line-height: 1.7; }

.practice-tasks {
  margin: 14px 0 20px;
  padding: 14px 16px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--panel);
}
.practice-tasks > p:first-child { margin-top: 0; }
.practice-task {
  margin: 0 0 12px;
  padding: 10px 14px;
  border-radius: 8px;
  border: 1px solid var(--accent-2);
  background: rgba(53, 196, 143, 0.08);
  font-size: 0.92rem;
}
.practice-task:last-child { margin-bottom: 0; }
.practice-task summary {
  cursor: pointer;
  color: var(--accent-2);
  font-weight: 700;
  list-style: none;
}
.practice-task summary::-webkit-details-marker { display: none; }
.practice-task summary::before {
  content: "▶";
  display: inline-block;
  margin-right: 8px;
  font-size: 0.7em;
}
.practice-task[open] summary::before { transform: rotate(90deg); display: inline-block; }
.practice-task .practice-q { color: var(--text); font-weight: 400; }
.practice-task .practice-a { margin: 10px 0 0; color: var(--text); line-height: 1.7; padding-top: 8px; border-top: 1px dashed var(--border); }

.readq-category-title {
  margin: 10px 0 8px;
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 700;
}
.readq-category-badge {
  display: inline-block;
  margin-left: 8px;
  padding: 3px 10px;
  border-radius: 999px;
  font-size: 0.74rem;
  font-weight: 700;
  background: var(--panel-2);
  border: 1px solid var(--border);
  color: var(--info);
}
.readq-term {
  background: #0a0c10;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  margin: 14px 0 18px;
}
.readq-term-toolbar {
  background: var(--panel-2);
  padding: 6px 14px;
  border-bottom: 1px solid var(--border);
  font-size: 0.78rem;
  color: var(--muted);
}
.readq-term-body {
  margin: 0;
  padding: 14px 16px;
  font-family: "SFMono-Regular", Menlo, Consolas, monospace;
  font-size: 0.86rem;
  color: #d7f7e3;
  white-space: pre-wrap;
  word-break: break-word;
  max-height: 360px;
  overflow-y: auto;
}
.readq-term-body .term-prompt { color: var(--accent); }
.readq-term-command { color: #8fd3ff; }
.readq-question {
  margin: 0 0 14px;
  font-size: 0.98rem;
  font-weight: 700;
  color: var(--text);
}
.readq-choices {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 14px;
}
.readq-choice-btn {
  text-align: left;
  padding: 10px 14px;
  border-radius: 8px;
  background: var(--panel-2);
  border: 1px solid var(--border);
  color: var(--text);
  font-family: inherit;
  font-size: 0.9rem;
  cursor: pointer;
}
.readq-choice-btn:hover:not(:disabled) { border-color: var(--accent); }
.readq-choice-btn.is-correct {
  border-color: var(--accent-2);
  background: rgba(53, 196, 143, 0.14);
  color: var(--accent-2);
  font-weight: 700;
}
.readq-choice-btn.is-wrong {
  border-color: var(--danger);
  background: rgba(220, 90, 90, 0.14);
  color: var(--danger);
}
.readq-choice-btn:disabled { cursor: default; opacity: 0.85; }
.readq-status {
  margin: 10px 0 14px;
  padding: 10px 14px;
  border-radius: 8px;
  background: var(--panel-2);
  border: 1px solid var(--border);
  font-size: 0.88rem;
}
.readq-status.is-success {
  background: rgba(53, 196, 143, 0.14);
  border-color: var(--accent-2);
  color: var(--accent-2);
  font-weight: 700;
}
.readq-status.is-wrong {
  background: rgba(220, 90, 90, 0.12);
  border-color: var(--danger);
  color: var(--danger);
  font-weight: 700;
}
.readq-related { margin: 0 0 14px; color: var(--muted); font-size: 0.86rem; }
.readq-related a { color: var(--accent); }

.writeq-category-title {
  margin: 10px 0 8px;
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 700;
}
.writeq-category-badge {
  display: inline-block;
  margin-left: 8px;
  padding: 3px 10px;
  border-radius: 999px;
  font-size: 0.74rem;
  font-weight: 700;
  background: var(--panel-2);
  border: 1px solid var(--border);
  color: var(--info);
}
.writeq-filename {
  margin: 0 0 10px;
  font-family: "SFMono-Regular", Menlo, Consolas, monospace;
  font-size: 0.82rem;
  color: var(--muted);
}
.writeq-scenario {
  margin: 0 0 16px;
  color: var(--text);
  line-height: 1.8;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px 16px;
}
.writeq-scenario code { color: var(--accent); }
.writeq-textarea {
  width: 100%;
  min-height: 160px;
  margin-bottom: 12px;
  padding: 12px 14px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: #0a0c10;
  color: #d7f7e3;
  font-family: "SFMono-Regular", Menlo, Consolas, monospace;
  font-size: 0.88rem;
  line-height: 1.6;
  resize: vertical;
  box-sizing: border-box;
}
.writeq-actions { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 14px; }
.writeq-checklist { display: flex; flex-direction: column; gap: 6px; margin-bottom: 12px; }
.writeq-check-item {
  padding: 8px 12px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--panel-2);
  font-size: 0.86rem;
}
.writeq-check-item.is-pass { border-color: var(--accent-2); color: var(--accent-2); }
.writeq-check-item.is-fail { border-color: var(--danger); color: var(--danger); }
.writeq-status {
  margin: 10px 0 14px;
  padding: 10px 14px;
  border-radius: 8px;
  background: var(--panel-2);
  border: 1px solid var(--border);
  font-size: 0.88rem;
}
.writeq-status.is-success {
  background: rgba(53, 196, 143, 0.14);
  border-color: var(--accent-2);
  color: var(--accent-2);
  font-weight: 700;
}
.writeq-status.is-partial {
  background: rgba(244, 185, 66, 0.12);
  border-color: var(--accent);
  color: var(--accent);
  font-weight: 700;
}
.writeq-diff {
  margin: 4px 0 16px;
  padding: 12px 14px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: #0a0c10;
}
.writeq-diff h3 { margin: 0 0 8px; font-size: 0.86rem; color: var(--muted); }
.writeq-diff-output {
  margin: 0 0 14px;
  font-family: "SFMono-Regular", Menlo, Consolas, monospace;
  font-size: 0.84rem;
  line-height: 1.6;
  white-space: pre-wrap;
  word-break: break-word;
}
.writeq-diff-output .diff-add { color: var(--accent-2); }
.writeq-diff-output .diff-remove { color: var(--danger); text-decoration: line-through; opacity: 0.85; }
.writeq-diff-output .diff-same { color: var(--muted); }
.writeq-model-answer {
  margin: 0;
  padding: 10px 12px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--panel-2);
  color: #d7f7e3;
  font-family: "SFMono-Regular", Menlo, Consolas, monospace;
  font-size: 0.84rem;
  white-space: pre-wrap;
  word-break: break-word;
}
.writeq-related { margin: 0 0 14px; color: var(--muted); font-size: 0.86rem; }
.writeq-related a { color: var(--accent); }

.challenge-related { margin: 0 0 14px; color: var(--muted); font-size: 0.86rem; }
.challenge-related a { color: var(--accent); }

.challenge-next-btn { margin-top: 4px; }

@media (max-width: 820px) {
  .layout { grid-template-columns: 1fr; }
  .nav-toggle { display: inline-block; }
  .site-search { order: 3; flex-basis: 100%; max-width: none; }
  /* スマホ幅ではサイドバーが全幅になり、初級/中級/上級/AWSの各タブの
     横幅にも余裕ができる。折り返しが起きない分、文字が箱の上寄りに
     見えることがあるため、上下・左右とも中央に来るようflexで揃える。 */
  .level-tab { display: flex; align-items: center; justify-content: center; }
  .sidebar {
    position: static;
    max-height: none;
    display: none;
  }
  .sidebar.open { display: block; }
  .hero { padding: 28px 20px; }
  .hero h1 { font-size: 1.5rem; }
  .page-nav { flex-direction: column; }
  .page-nav a { max-width: 100%; }
}

@media (max-width: 480px) {
  .terminal { height: 380px; font-size: 16px; }
  #term-input { font-size: 16px; }
  .quiz-question label { padding: 10px 8px; }
  .term-toolbar { font-size: 0.74rem; }
  .term-ctrl-btn { font-size: 0.78rem; padding: 10px 4px; }
}

/* ===== 練習用ターミナル: スマホ表示でモード切り替えタブを2×2に配置
   （練習モード・課題モードが並ぶ4つのタブは、幅の狭い画面では横1列だと
   見た目が窮屈になるため、上段: 練習モード/課題モード、下段: 出力を読む/
   設定ファイルを書く、の2行×2列に折り返す。PC表示（640px超）は従来どおり
   横1列のまま変更しない。） ===== */
@media (max-width: 640px) {
  .mode-tabs {
    flex-wrap: wrap;
  }
  .mode-tab {
    flex: 1 1 calc(50% - 4px);
    box-sizing: border-box;
  }
}

/* ===== コマンド集: スマホ表示でのテーブルをカード型レイアウトに変更 =====
   4列の表をそのまま縮小すると文字が潰れて読みにくくなるため、
   幅の狭い画面ではテーブルの見た目をやめ、1コマンド＝1カードの
   縦積みレイアウトに切り替える。各セルの見出し（コマンド／主なオプション／
   説明／関連する章）は、build.pyが出力する data-label 属性から
   ::before で補って表示する。 */
@media (max-width: 640px) {
  .cmd-table thead {
    display: none;
  }
  .cmd-table,
  .cmd-table tbody,
  .cmd-table tr,
  .cmd-table td {
    display: block;
    width: 100%;
  }
  .cmd-table tr.cmd-row {
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 10px 12px;
    margin-bottom: 10px;
    background: var(--panel-2);
  }
  .cmd-table tr.cmd-row td {
    padding: 6px 0;
    border: none;
  }
  .cmd-table tr.cmd-row td:not(:last-child) {
    border-bottom: 1px dashed var(--border);
  }
  .cmd-table td[data-label]::before {
    content: attr(data-label);
    display: block;
    font-size: 0.72rem;
    color: var(--muted);
    margin-bottom: 3px;
  }
  .cmd-table .cmd-name-btn {
    font-size: 1rem;
  }
  .cmd-table tr.cmd-example-row {
    margin-top: -8px;
    margin-bottom: 10px;
  }
  .cmd-table tr.cmd-example-row td {
    padding: 8px 12px;
    border: 1px solid var(--border);
    border-top: none;
    border-radius: 0 0 var(--radius) var(--radius);
  }
}

/* ===== コマンド集: スマホ表示で実行例が常に開いたままになる不具合の修正 =====
   直前に追加した「.cmd-table tr { display: block; }」が、ブラウザ標準の
   hidden属性による非表示（display: none）より優先されてしまい、
   本来はコマンド名クリックで開く実行例が常に表示された状態になっていた。
   hidden属性が付いている間は明示的にdisplay: noneにする。 */
@media (max-width: 640px) {
  .cmd-table tr.cmd-example-row[hidden] {
    display: none;
  }
}

/* ===== 内部リンク強化：本文中の自動リンク（用語集・コマンド集への控えめなリンク） ===== */
.auto-link {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px dotted var(--muted);
}
.auto-link:hover,
.auto-link:focus-visible {
  color: var(--accent);
  border-bottom-color: var(--accent);
}
.auto-link code,
code .auto-link {
  color: inherit;
}

/* ===== 内部リンク強化：用語集の項目にハッシュリンクでジャンプしてきた場合の一時ハイライト ===== */
.glossary-term-highlight {
  animation: cmd-row-flash 2.5s ease;
  border-radius: 6px;
}

/* ===== 内部リンク強化：各章末の「関連ページ」ブロック ===== */
.related-pages {
  margin-top: 32px;
  padding: 18px 20px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--panel);
}
.related-pages h2 {
  margin-top: 0;
  border: none;
  font-size: 1.05rem;
}
.related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px 24px;
}
.related-block h3 {
  margin: 0 0 8px;
  font-size: 0.88rem;
  color: var(--muted);
  font-weight: 700;
  letter-spacing: 0.02em;
}
.related-block ul {
  margin: 0;
  padding-left: 1.1em;
  line-height: 1.8;
}
.related-block p {
  margin: 0;
  line-height: 1.8;
}
.related-cmd-list {
  list-style: none;
  padding-left: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px 10px;
}
.related-cmd-list li {
  display: inline-block;
}
.related-cmd-list a {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--panel-2);
  font-size: 0.85rem;
  text-decoration: none;
}
.related-cmd-list a:hover {
  border-color: var(--accent);
  color: var(--accent);
}