/* ===================================================
   common.css
   共通スタイル（ベース、記事基盤、フッター、ユーティリティ）
   style.css から分割生成
   =================================================== */

/* ===================================================
   1. 変数・リセット・アクセシビリティ
   =================================================== */
:root {
  --color-primary: #1a3d5c;
  --color-primary-light: #2a5f8f;
  --color-accent: #2196f3;
  --color-accent-warm: #e65c00;
  --color-bg: #f5f7fa;
  --color-surface: #ffffff;
  --color-text: #2c3e50;
  --color-text-muted: #666666;
  --color-border: #dde4ee;
  --color-tab-active: #2e7d32;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.12);
  --shadow-lg: 0 14px 34px rgba(0, 0, 0, 0.18);
  --radius: 8px;
  --radius-lg: 16px;
  --font-main: "Noto Sans JP", sans-serif;
  --transition: 0.25s ease;
  --header-height: 64px;
  --tab-nav-height: 0px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + var(--tab-nav-height) + 12px);
}
body {
  font-family: var(--font-main);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
  min-height: 100vh;
  word-break: normal;
  overflow-wrap: break-word;
}
img { max-width: 100%; height: auto; }
a { color: var(--color-accent); text-decoration: none; }
a:hover { text-decoration: underline; }
button { font-family: inherit; }
code,
pre,
.code-block,
.code-readonly,
.formula-copy-code,
.article-link,
.article-summary,
.related-card-title,
.related-card-desc,
.error-message {
  overflow-wrap: anywhere;
}

.skip-link {
  position: absolute;
  top: -100px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-accent);
  color: #fff;
  padding: 10px 24px;
  border-radius: 0 0 8px 8px;
  font-weight: 700;
  font-size: 0.9em;
  z-index: 9999;
  text-decoration: none;
  transition: top 0.2s ease;
}
.skip-link:focus { top: 0; }
*:focus-visible { outline: 3px solid var(--color-accent); outline-offset: 2px; border-radius: 3px; }

/* ===================================================
   2. ヘッダー・タブナビ
   =================================================== */
.site-header {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
  color: #fff;
  box-shadow: var(--shadow-md);
  position: sticky;
  top: 0;
  z-index: 200;
}
.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}
.site-title { font-size: 1.35em; font-weight: 700; letter-spacing: 0.02em; white-space: nowrap; }
.site-title a { color: #fff; text-decoration: none; }
.site-subtitle { font-size: 0.8em; color: rgba(255, 255, 255, 0.75); white-space: nowrap; }
.header-brand { display: flex; flex-direction: column; gap: 2px; }
.sub-quote { font-size: 0.9em; color: rgba(255, 255, 255, 0.85); font-style: italic; margin-right: 6px; }
.sub-main { font-size: 0.75em; color: rgba(255, 255, 255, 0.65); }

.tab-nav {
  background: #f5f7fa;
  border-bottom: 2px solid var(--color-tab-active);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  position: sticky;
  top: var(--header-height);
  z-index: 150;
}
.tab-nav::-webkit-scrollbar { display: none; }
.tab-nav-inner {
  width: min(100%, 1480px);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 0.8fr 1.08fr 1fr 1.12fr 1.2fr 1.05fr 1.15fr;
  gap: 5px;
  padding: 8px 14px 0;
  align-items: end;
}
.tab-nav-aux {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 12px 8px;
  text-align: right;
}
.tab-nav-aux a {
  display: inline-block;
  font-size: 0.83rem;
  font-weight: 700;
  color: var(--color-primary);
  background: #e9edf2;
  border: 1px solid #d0d7e2;
  border-radius: 999px;
  padding: 4px 12px;
  text-decoration: none;
}
.tab-nav-aux a:hover {
  background: #dbe4ee;
  text-decoration: none;
}
.tab-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 5px;
  min-width: 0;
  min-height: 52px;
  color: #555;
  background: #e0e4e8;
  border: 1px solid #cdd4dc;
  border-bottom: none;
  border-radius: 8px 8px 0 0;
  padding: 9px 10px;
  margin-bottom: -2px;
  font-size: clamp(0.84rem, 0.86vw, 1rem);
  font-weight: 700;
  cursor: pointer;
  line-height: 1.2;
  text-align: center;
  white-space: normal;
  transition: color var(--transition), background var(--transition);
  position: relative;
}
.tab-btn .tag-vba {
  flex: 0 0 auto;
  font-size: 0.68em;
  padding: 2px 6px;
  line-height: 1.15;
}
.tab-btn:hover { color: #333; background: #d4d9df; }
.tab-btn.active {
  background: #fff;
  color: var(--color-tab-active);
  border-color: #cdd4dc;
  font-weight: 700;
  border-top: 3px solid var(--color-tab-active);
  padding-bottom: 12px;
  z-index: 10;
}
.tab-btn[data-tab="unlocked"].active { color: #4a148c !important; border-top-color: #651fff; }

.main-content { max-width: 1200px; margin: 0 auto; padding: 24px 20px 60px; }
.tab-panel {
  display: none;
  scroll-margin-top: calc(var(--header-height) + var(--tab-nav-height) + 16px);
}
.tab-panel.active { display: block; }

/* タブ内サブ見出し（h4） */
.tab-panel h4 {
  font-size: 0.95em;
  font-weight: 700;
  color: var(--color-primary);
  margin: 18px 0 10px;
  padding-left: 4px;
}


/* ===================================================
   5. 記事ページ基盤
   =================================================== */
.article-layout {
  max-width: 1040px;
  margin: 0 auto;
  padding: 28px 24px 60px;
}
.article-body {
  background: #fff;
  border-radius: var(--radius);
  padding: 36px 44px;
  box-shadow: var(--shadow-sm);
  line-height: 1.9;
}
.article-header {
  border-bottom: 2px solid var(--color-border);
  padding-bottom: 18px;
  margin-bottom: 28px;
}
.article-title { font-size: 1.6em; color: var(--color-primary); line-height: 1.45; margin-top: 6px; }
.maker-name {
  display: inline-block;
  white-space: nowrap;
  font-weight: 900;
  letter-spacing: 0;
  border-radius: 999px;
  padding: 0.02em 0.42em;
  line-height: 1.35;
}
.maker-name.maker-zebra {
  color: #0e4f7b;
  background: #eef7ff;
  border: 1px solid #99c7f0;
}
.maker-name.maker-honeywell {
  color: #914b00;
  background: #fff4e5;
  border: 1px solid #ffc46a;
}
.maker-name.maker-opticon {
  color: #256b35;
  background: #ecf8ef;
  border: 1px solid #9ed6ad;
}
.maker-kana {
  font-size: 0.72em;
  font-weight: 800;
  margin-left: 0.28em;
  opacity: 0.82;
}
.maker-title {
  display: inline-block;
  margin: 0 0 0.18em;
  line-height: 1.2;
}
.maker-tool {
  display: inline-block;
  color: var(--color-primary);
  font-weight: 900;
  line-height: 1.35;
}
.maker-topic {
  display: block;
  color: var(--color-primary);
  font-size: 0.94em;
  font-weight: 700;
  line-height: 1.45;
  margin-top: 0.08em;
}
.maker-compare-line {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.25em;
  margin-top: 0.14em;
}
.article-summary .maker-name,
.news-list .maker-name,
.rarity-ranking .maker-name {
  font-size: 0.9em;
  margin-right: 0.2em;
  vertical-align: 0.02em;
}
.article-title .maker-name {
  display: inline-block;
  margin-bottom: 0;
  background: transparent;
  border-radius: 0;
  border: 0;
  color: #123e5c;
  font-size: inherit;
  border-bottom: 4px solid #ffb14a;
  padding: 0 0.08em 0.03em;
}
.article-title .maker-zebra { border-bottom-color: #2f8fd3; }
.article-title .maker-honeywell { border-bottom-color: #f2a12b; }
.article-title .maker-opticon { border-bottom-color: #46a760; }
.article-title .maker-title {
  margin-bottom: 0.16em;
}
.article-title .maker-tool {
  font-size: 0.86em;
}
.article-title .maker-topic {
  font-size: 0.88em;
}
.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  font-size: 0.85em;
  color: #777;
  margin-bottom: 12px;
}
.article-meta .badge { margin-right: 4px; }
.article-date { margin-left: auto; color: #999; }

.article-body h2 {
  font-size: 1.3em;
  color: var(--color-primary);
  border-left: 5px solid var(--color-accent);
  padding: 4px 0 4px 14px;
  margin: 36px 0 16px;
}
.article-body h3 { font-size: 1.1em; color: #2a5f8f; margin: 26px 0 12px; padding-left: 4px; }

/* パンくず */
.breadcrumb {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-text-muted);
  padding: 8px 0 24px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  line-height: 1.6;
}
.breadcrumb a { color: var(--color-accent); text-decoration: none; font-weight: 700; }
.breadcrumb span { color: #ccc; margin: 0 2px; }
.breadcrumb strong { color: var(--color-text); font-weight: 700; }

/* バッジ */
.badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 4px;
  font-weight: bold;
  font-size: 0.85rem;
  color: #fff;
}
.badge-2019, .badge-2021, .badge-2024 { background: #0078d4; }
.badge-365 { background: #2b579a; }
.badge-all { background: #607d8b !important; color: #fff; }
.badge-no-2021 { background: #e53935; }
.badge-maniac { background: #d32f2f !important; color: #fff; }
.badge-prep {
  display: inline-block;
  background: #9e9e9e;
  color: #fff;
  padding: 2px 8px;
  border-radius: 3px;
  font-size: 0.85em;
  margin-left: 4px;
}
a[aria-disabled="true"] { color: #999 !important; cursor: not-allowed; }

/* レベル */
.level-bar {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 4px;
  flex-wrap: wrap;
}
.level-label {
  display: inline-block;
  padding: 2px 9px;
  border-radius: 4px;
  color: #fff;
  font-size: 0.8em;
  font-weight: 700;
  letter-spacing: 0.03em;
  white-space: nowrap;
  line-height: 1.5;
}
.lv-1 .level-label { background: #43a047; }
.lv-2 .level-label { background: #66bb6a; }
.lv-3 .level-label { background: #1e88e5; }
.lv-4 .level-label { background: #1565c0; }
.lv-5 .level-label { background: #f57c00; }
.lv-6 .level-label { background: #e53935; }
.lv-7 .level-label { background: #c62828; }
.lv-8 .level-label { background: #6a1b9a; }

.level-blocks { display: inline-flex; gap: 2px; }
.level-blocks span {
  display: inline-block;
  width: 12px;
  height: 12px;
  border-radius: 2px;
  background: #e0e0e0;
}
.lv-1 .level-blocks span:nth-child(-n + 1) { background: #43a047; }
.lv-2 .level-blocks span:nth-child(-n + 2) { background: #66bb6a; }
.lv-3 .level-blocks span:nth-child(-n + 3) { background: #1e88e5; }
.lv-4 .level-blocks span:nth-child(-n + 4) { background: #1565c0; }
.lv-5 .level-blocks span:nth-child(-n + 5) { background: #f57c00; }
.lv-6 .level-blocks span:nth-child(-n + 6) { background: #e53935; }
.lv-7 .level-blocks span:nth-child(-n + 7) { background: #c62828; }
.lv-8 .level-blocks span:nth-child(-n + 8) { background: #6a1b9a; }

/* タグ */
.tag-row {
  display: inline-flex;
  gap: 5px;
  margin-left: 4px;
  flex-wrap: wrap;
}
.tag-impact, .tag-rare, .tag-prereq {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 0.76em;
  font-weight: 700;
  white-space: nowrap;
}
.tag-impact { color: #e65100; background: #fff3e0; border: 1px solid #ffb74d; }
.tag-rare { color: #6a1b9a; background: #f3e5f5; border: 1px solid #ce93d8; }
.tag-prereq { color: #1565c0; background: #e3f2fd; border: 1px solid #64b5f6; }
.tag-vba {
  display: inline-block;
  background: #4a148c;
  color: #fff;
  font-size: 0.72em;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 4px;
  letter-spacing: 0.02em;
}

/* 凡例 */
.level-legend {
  margin-bottom: 24px;
  background: #f8f9fa;
  border-radius: 8px;
  border: 1px solid #e0e0e0;
  font-size: 0.8em;
  color: #555;
  overflow: hidden;
}
.legend-row-levels, .legend-row-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 16px;
  padding: 12px 16px;
}
.legend-row-tags { border-top: 1px solid #e0e0e0; background: #f1f3f4; }
.level-legend-item, .legend-tag-desc {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  white-space: nowrap;
}
.legend-tag-desc .tag-desc-text { color: #666; }
.lv-dot {
  display: inline-block;
  width: 11px;
  height: 11px;
  border-radius: 2px;
}
.lv-dot-1 { background: #43a047; }
.lv-dot-2 { background: #66bb6a; }
.lv-dot-3 { background: #1e88e5; }
.lv-dot-4 { background: #1565c0; }
.lv-dot-5 { background: #f57c00; }
.lv-dot-6 { background: #e53935; }
.lv-dot-7 { background: #c62828; }
.lv-dot-8 { background: #6a1b9a; }

/* カテゴリヘッダー / サブカテゴリ見出し */
.category-header { margin-bottom: 28px; }
.category-header h2 {
  font-size: 1.4em;
  color: var(--color-primary);
  font-weight: 700;
  margin-bottom: 8px;
}
.category-header p { font-size: 0.9em; color: var(--color-text-muted); }
.category-desc {
  background: #f8faff;
  border-left: 4px solid var(--color-primary);
  padding: 16px 20px;
  border-radius: 0 var(--radius) var(--radius) 0;
  margin-bottom: 20px;
  font-size: 0.9em;
  line-height: 1.7;
  color: #444;
}
.subcategory-heading {
  font-size: 1.05em;
  font-weight: 700;
  color: #444;
  margin: 32px 0 16px;
  padding-bottom: 6px;
  border-bottom: 2px solid var(--color-border);
  display: flex;
  align-items: center;
  gap: 8px;
}
.subcategory-heading::before {
  content: "";
  display: inline-block;
  width: 4px;
  height: 1em;
  background: var(--color-accent);
  border-radius: 2px;
}

/* 記事リスト */
.article-list {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 14px;
}
.article-item {
  background: var(--color-surface);
  border-radius: var(--radius);
  padding: 16px 20px;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition);
  border-left: 4px solid var(--color-border);
}
.article-item:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-left-color: var(--color-accent);
}
.article-link {
  display: block;
  font-weight: 700;
  font-size: 0.97em;
  color: var(--color-primary);
  margin-bottom: 6px;
  line-height: 1.5;
}
.article-link:hover { color: var(--color-accent); text-decoration: none; }
.article-link .maker-name {
  display: inline-block;
  margin-bottom: 0;
  color: #123e5c;
  font-size: 0.94em;
  background: #eef7ff;
  border: 1px solid #abd4f7;
  border-radius: 6px;
  padding: 0.02em 0.42em;
  margin-right: 0.16em;
}
.article-link .maker-zebra {
  color: #0e4f7b;
  background: #eef7ff;
  border-color: #99c7f0;
}
.article-link .maker-honeywell {
  color: #914b00;
  background: #fff4e5;
  border-color: #ffc46a;
}
.article-link .maker-opticon {
  color: #256b35;
  background: #ecf8ef;
  border-color: #9ed6ad;
}
.article-link .maker-title {
  margin-bottom: 0.16em;
}
.article-link .maker-tool {
  font-size: 1.02em;
}
.article-summary {
  font-size: 0.82em;
  color: var(--color-text-muted);
  line-height: 1.6;
}
.article-item.highlight {
  border-left-color: #e65c00;
  border-left-width: 5px;
  background: #fffcf8;
}
.article-item.highlight:hover {
  border-left-color: #f44336;
  box-shadow: 0 6px 15px rgba(230, 92, 0, 0.15);
}
.article-item.highlight .article-link {
  color: #c43200;
  font-size: 1.02em;
}

.learning-route-list {
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 12px 14px;
}
.learning-route-list > li {
  list-style: none;
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid #dce8f3;
  border-left: 4px solid #87bde8;
  border-radius: 8px;
  padding: 13px 15px;
}
.learning-route-list .article-link {
  margin-bottom: 5px;
  font-size: 0.94em;
  line-height: 1.45;
}
.learning-route-list .maker-compare-line {
  margin-top: 0.22em;
  margin-bottom: 0.08em;
}
.learning-route-list .maker-tool {
  font-size: 0.96em;
}
.learning-route-list .maker-topic {
  font-size: 0.86em;
  color: #526579;
}
.learning-route-list .article-summary {
  font-size: 0.8em;
  line-height: 1.65;
}


.site-footer {
  background: var(--color-primary);
  color: rgba(255, 255, 255, 0.7);
  text-align: center;
  padding: 24px 20px;
  font-size: 0.85em;
  line-height: 2;
}
.site-footer a { color: #ba9bff; }
.site-footer a:hover { color: #ffffff; }
.site-footer-trust {
  max-width: 1040px;
  margin: 0 auto 18px;
  padding: 18px 20px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.08);
  color: rgba(255, 255, 255, 0.86);
  text-align: left;
}
.site-footer-trust p {
  margin: 0 0 8px;
  font-size: 0.86em;
  line-height: 1.75;
}
.site-footer-trust p:last-child { margin-bottom: 0; }
.site-footer-trust strong { color: #ffffff; }
.site-footer-trust a {
  color: #d7c8ff;
  font-weight: 700;
}
.site-footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 14px;
}
.site-footer-links a { white-space: nowrap; }
.site-footer-legal-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 4px 10px;
  margin: 10px auto 8px;
  color: rgba(255, 255, 255, 0.72);
}
.site-footer-legal-links a {
  color: #d7c8ff;
  font-weight: 700;
  white-space: nowrap;
}
.site-footer-legal-links span {
  color: rgba(255, 255, 255, 0.42);
}
.footer-contact-wrap { text-align: center; margin-bottom: 12px; }
.footer-contact-btn {
  display: inline-block;
  padding: 8px 20px;
  background: #5c6bc0;
  color: #fff;
  border-radius: 6px;
  text-decoration: none;
  font-size: 0.88em;
  transition: background 0.2s;
}
.footer-contact-btn:hover { background: #3f51b5; text-decoration: none; }

.site-legal-notice {
  margin: 44px 0 0;
  padding: 24px 28px;
  border: 1px solid #d6e2ee;
  border-left: 6px solid var(--color-primary);
  border-radius: var(--radius);
  background: #f8fbff;
  color: #2f3f4f;
  box-shadow: var(--shadow-sm);
}
.article-body .site-legal-notice h2 {
  margin: 0 0 12px;
  padding: 0 0 0 12px;
  border-left: 4px solid var(--color-accent);
  color: var(--color-primary);
  font-size: 1.12em;
  line-height: 1.45;
}
.site-legal-lead {
  margin: 0 0 16px;
  color: #526579;
  font-size: 0.92em;
  line-height: 1.8;
}
.site-legal-detail {
  overflow: hidden;
  border: 1px solid #dce7f2;
  border-radius: 6px;
  background: #fff;
}
.site-legal-detail + .site-legal-detail {
  margin-top: 10px;
}
.site-legal-detail summary {
  cursor: pointer;
  padding: 12px 16px;
  color: var(--color-primary);
  background: #edf4fb;
  font-weight: 800;
  line-height: 1.5;
}
.site-legal-detail summary:hover {
  background: #e3eef8;
}
.site-legal-panel {
  padding: 18px 20px 20px;
}
.site-legal-panel h3 {
  margin: 22px 0 8px;
  padding-left: 8px;
  border-left: 3px solid #8fb6d8;
  color: #244f75;
  font-size: 1em;
}
.site-legal-panel h3:first-child {
  margin-top: 0;
}
.site-legal-panel p,
.site-legal-panel li,
.site-legal-panel dd {
  font-size: 0.9em;
  line-height: 1.85;
}
.site-legal-panel p {
  margin: 0 0 12px;
}
.site-legal-panel ul {
  margin: 8px 0 16px;
  padding-left: 1.35em;
}
.site-legal-meta {
  display: grid;
  grid-template-columns: minmax(92px, 0.24fr) 1fr;
  gap: 8px 16px;
  margin: 0 0 18px;
}
.site-legal-meta dt {
  color: #526579;
  font-weight: 800;
}
.site-legal-meta dd {
  margin: 0;
}
.site-legal-updated {
  margin-top: 18px;
  color: #66788a;
  font-size: 0.86em;
  font-weight: 700;
}
@media (max-width: 640px) {
  .site-legal-notice {
    padding: 18px 14px;
  }
  .site-legal-panel {
    padding: 14px 14px 16px;
  }
  .site-legal-meta {
    grid-template-columns: 1fr;
    gap: 2px;
  }
  .site-footer-legal-links {
    gap: 2px 8px;
  }
}

.qr-safety-note {
  background: #fff8e1;
  border: 1px solid #f3c46a;
  border-left: 6px solid #d97706;
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  margin: 28px 0;
  padding: 22px 26px;
}
.qr-safety-note h2,
.qr-safety-note h3 {
  color: #8a4b00;
  font-size: 1.12em;
  margin: 0 0 10px;
}
.qr-safety-note p {
  color: #5d4037;
  font-size: 0.92em;
  line-height: 1.8;
  margin-bottom: 10px;
}
.qr-safety-note ul {
  margin: 0;
  padding-left: 1.2em;
}
.qr-safety-note li {
  color: #5d4037;
  font-size: 0.9em;
  line-height: 1.75;
  margin: 4px 0;
}

/* ===================================================
   9. ユーティリティ
   =================================================== */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }
.font-bold { font-weight: 700; }
.mb-32 { margin-bottom: 32px; }
.mt-10 { margin-top: 10px; }
.mt-30 { margin-top: 30px; }
.my-20 { margin-top: 20px !important; margin-bottom: 20px !important; }
.ml-4 { margin-left: 4px; }
.pt-0 { padding-top: 0 !important; }
.pb-40 { padding-bottom: 40px !important; }
.mx-auto { margin-left: auto !important; margin-right: auto !important; }
.max-width-680 { max-width: 680px; }
.max-width-700 { max-width: 700px; }
.max-width-800 { max-width: 800px; }
.margin-y-10-20 { margin: 10px 0 20px; }
.margin-y-16-24 { margin: 16px 0 24px; }
.font-size-082 { font-size: 0.82em; }
.font-size-085 { font-size: 0.85em; }
.opacity-085 { opacity: 0.85; }
.color-text-light { color: #666; }
.color-green-bold { color: #217346; font-weight: 700; }
.color-purple-bold { color: #7c4dff; font-weight: bold; }
.color-deep-purple-bold { color: #4a148c; font-weight: bold; }
.color-light-purple { color: #ba9bff; }
.text-blue-primary { color: var(--color-primary); font-weight: 700; }
.text-sm-gray { color: #777; font-size: 0.8rem; margin-bottom: 12px; }
.text-desc { margin-bottom: 16px; font-size: 0.95em; line-height: 1.6; color: #444; }

/* ===================================================
   10. レスポンシブ
   =================================================== */
@media (max-width: 768px) {
  .header-inner { height: auto; padding: 14px 16px; flex-wrap: wrap; gap: 4px; }
  .tab-nav-inner {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 6px;
    padding: 8px 8px 0;
  }
  .tab-btn {
    min-height: 46px;
    padding: 8px 8px;
    font-size: 0.84rem;
    border-bottom: 1px solid #cdd4dc;
    border-radius: 8px;
    margin-bottom: 0;
  }
  .tab-btn.active { padding-bottom: 8px; }
  .tab-nav-aux { padding: 0 8px 8px; text-align: left; }
  .tab-nav-aux a { font-size: 0.78rem; }
  .article-list,
  .pickup-grid,
  .home-sub-grid,
  .reasons-grid {
    grid-template-columns: 1fr;
  }
  .weapons-grid { grid-template-columns: 1fr 1fr; }
  .version-guide-body { grid-template-columns: 1fr; }
  .version-col { border-right: none; border-bottom: 1px solid var(--color-border); }
  .version-col:last-child { border-bottom: none; }
  .hero-cta-buttons { flex-direction: column; align-items: center; }
  .hero-cta-btn { width: 100%; max-width: 280px; }
  .hero-stats { gap: 10px; }
  .hero-stat { min-width: 100px; }
  .formula-copy-row { grid-template-columns: 1fr; }
  .formula-copy-label { border-right: none; border-bottom: 1px solid #cfd8dc; }
  .formula-copy-btn { border-left: none; border-top: 1px solid #cfd8dc; padding: 10px; }
  .article-body { padding: 24px 20px; }
  .hero-copy { left: 5% !important; max-width: 88% !important; }
  .pattern-card { padding: 24px 22px 22px 26px; }
  .pattern-card h4 { font-size: 1.2em; }
  .solution-patterns-grid { grid-template-columns: 1fr; gap: 20px; }
  .article-layout { padding: 20px 14px 40px; }
  body > section.main-content .hero-contact > a {
    aspect-ratio: 4 / 1.6;
  }
  .arch-row { flex-direction: column; }
  .arch-arrow { transform: rotate(90deg); margin: 8px 0; }
}

@media (max-width: 480px) {
  .weapons-grid { grid-template-columns: 1fr; }
  .hero-stat { min-width: 80px; padding: 10px 6px; }
  .article-body { padding: 20px 16px; }
  body > section.main-content .hero-contact > a {
    aspect-ratio: 3 / 1.6;
  }
  body > section.main-content .hero-contact .hero-copy-title {
    font-size: 1rem !important;
  }
  body > section.main-content .hero-contact .hero-copy-sub {
    display: none !important;
  }
}

.tab-btn:focus-visible {
  outline-color: #2196f3;
  outline-offset: -3px;
}

.tab-btn:focus:not(:focus-visible) {
  outline: none;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}


.breadcrumb-category {
  color: var(--color-accent);
  cursor: pointer;
  font-weight: 700;
  text-decoration: none;
}

.breadcrumb-category:hover {
  text-decoration: underline;
}

/* ===================================================
   Mobile readability improvement
   スマホ可読性改善
   =================================================== */
@media (max-width: 768px) {
  :root {
    --header-height: 0px;
    --tab-nav-height: 48px;
  }

  .site-header {
    position: static;
  }

  .header-inner {
    height: auto;
    padding: 12px 14px;
    gap: 4px;
  }

  .site-title {
    font-size: 1.05rem;
    white-space: normal;
    line-height: 1.35;
  }

  .site-subtitle,
  .sub-quote,
  .sub-main {
    font-size: 0.72rem;
    white-space: normal;
    line-height: 1.4;
  }

  .tab-nav {
    position: sticky;
    top: 0;
    z-index: 50;
    overflow-x: auto;
    overflow-y: hidden;
    border-bottom: 1px solid var(--color-border);
    scrollbar-width: none;
    -webkit-overflow-scrolling: touch;
  }

  .tab-nav-inner {
    display: flex;
    width: max-content;
    min-width: 100%;
    gap: 6px;
    padding: 8px;
  }

  .tab-btn {
    flex: 0 0 auto;
    min-width: auto;
    min-height: 40px;
    padding: 8px 13px;
    font-size: 0.8rem;
    line-height: 1.2;
    white-space: nowrap;
    border: 1px solid #cdd4dc;
    border-radius: 999px;
    margin-bottom: 0;
  }

  .tab-btn.active {
    border-top: 1px solid var(--color-tab-active);
    border-color: var(--color-tab-active);
    padding-bottom: 8px;
    background: #fff;
  }

  .tab-nav-aux {
    display: none;
  }
}

@media (max-width: 600px) {
  body {
    background: #fff;
    font-size: 16px;
    line-height: 1.9;
    letter-spacing: 0.01em;
  }

  .main-content {
    padding: 14px 12px 40px;
  }

  .article-layout {
    padding: 12px 0 40px;
  }

  .breadcrumb {
    font-size: 0.9rem;
    padding: 4px 12px 14px;
    gap: 4px;
  }

  .site-description,
  .quick-route,
  .starter-guide,
  .starter-card,
  .category-desc,
  .qr-safety-note,
  .level-legend {
    padding: 18px 16px;
    border-radius: 10px;
  }

  .site-description {
    margin-bottom: 22px;
  }

  .site-description h2,
  .quick-route h2,
  .starter-guide-head h2,
  .category-header h2 {
    font-size: 1.08rem;
    line-height: 1.55;
  }

  .site-description p,
  .quick-route-lead,
  .starter-guide-head p,
  .starter-card p,
  .category-desc {
    font-size: 0.95rem;
    line-height: 1.85;
  }

  .quick-route-grid,
  .starter-guide-grid,
  .article-list {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .quick-route-card,
  .starter-card {
    padding: 16px;
  }

  .article-item {
    padding: 15px 16px;
    border-radius: 10px;
    box-shadow: 0 2px 8px rgba(26, 61, 92, 0.05);
  }

  .article-link {
    font-size: 0.98rem;
    line-height: 1.6;
    margin-bottom: 7px;
  }

  .article-summary {
    font-size: 0.9rem;
    line-height: 1.75;
  }

  .level-bar {
    gap: 4px;
  }

  .level-label,
  .tag-impact,
  .tag-rare,
  .tag-prereq {
    font-size: 0.72rem;
  }

  .category-hero {
    margin-bottom: 18px;
    border-radius: 10px;
  }

  .category-hero.hero-overlay {
    border-radius: 12px;
  }

  .hero-copy {
    left: 5% !important;
    right: 5% !important;
    max-width: 90% !important;
  }

  .hero-copy-title {
    font-size: clamp(1.1rem, 7vw, 1.7rem);
    line-height: 1.25;
  }

  .hero-copy-sub {
    font-size: 0.86rem;
    line-height: 1.6;
  }

  .hero-copy-tags {
    gap: 5px;
    margin-top: 10px;
  }

  .hero-copy-tag {
    font-size: 0.7rem;
    padding: 4px 9px;
  }

  h1,
  h2,
  h3,
  .article-link,
  .quick-route-title,
  .starter-card h3,
  .category-header h2 {
    text-wrap: balance;
  }
}