/* ==========================================================================
   FCドメイン — ダーク基調 + アクセントカラーのテック系デザイン
   ========================================================================== */

:root {
  --color-bg: #0b1120;
  --color-surface: #131b2e;
  --color-surface-alt: #1a2338;
  --color-border: #263251;
  --color-text: #e2e8f0;
  --color-text-muted: #94a3b8;
  --color-accent: #22d3ee;
  --color-accent-strong: #06b6d4;
  --color-accent-2: #a78bfa;
  --color-success: #34d399;
  --color-warning: #fbbf24;

  --font-sans: "Hiragino Kaku Gothic ProN", "Noto Sans JP", "Yu Gothic", sans-serif;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --container-width: 1120px;
  --header-height: 72px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  line-height: 1.8;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

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

a:hover {
  color: var(--color-accent-strong);
  text-decoration: underline;
}

.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 20px;
}

.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;
}

h1, h2, h3, h4 {
  font-weight: 700;
  line-height: 1.4;
  color: #fff;
}

h1 { font-size: clamp(1.6rem, 2.6vw, 2.4rem); margin: 0 0 0.6em; }
h2 {
  font-size: clamp(1.3rem, 2vw, 1.7rem);
  margin: 2.2em 0 0.8em;
  padding-left: 14px;
  border-left: 4px solid var(--color-accent);
}
h3 { font-size: 1.2rem; margin: 1.8em 0 0.6em; color: var(--color-accent-2); }

p { margin: 0 0 1.2em; color: var(--color-text); }

ul, ol { padding-left: 1.4em; }
li { margin-bottom: 0.4em; }

/* ── ヘッダー / ナビゲーション ───────────────────────────── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(11, 17, 32, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
  height: var(--header-height);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.site-logo {
  font-size: 1.3rem;
  font-weight: 800;
  color: #fff;
  letter-spacing: 0.02em;
}

.site-logo:hover {
  color: var(--color-accent);
  text-decoration: none;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
}

.nav-toggle__bar {
  display: block;
  width: 20px;
  height: 2px;
  margin: 0 auto;
  background: var(--color-text);
}

.site-nav > ul {
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0;
  gap: 4px;
  height: 100%;
}

.site-nav__item {
  position: relative;
  display: flex;
  align-items: center;
}

.site-nav__item > a {
  color: var(--color-text);
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  font-size: 0.92rem;
  font-weight: 600;
}

.site-nav__item:hover > a,
.site-nav__item.is-active > a {
  color: var(--color-bg);
  background: var(--color-accent);
  text-decoration: none;
}

.site-nav__submenu {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 280px;
  max-height: 60vh;
  overflow-y: auto;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 10px;
  list-style: none;
  margin: 6px 0 0;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.45);
}

.site-nav__item:hover .site-nav__submenu {
  display: block;
}

.site-nav__submenu li { margin: 0; }

.site-nav__submenu a {
  display: block;
  padding: 8px 10px;
  border-radius: var(--radius-sm);
  color: var(--color-text-muted);
  font-size: 0.88rem;
}

.site-nav__submenu a:hover {
  background: var(--color-surface-alt);
  color: var(--color-accent);
  text-decoration: none;
}

/* ── パンくずリスト ───────────────────────────────────── */
.breadcrumb {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 14px 20px 0;
}

.breadcrumb ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding: 0;
  margin: 0;
  font-size: 0.82rem;
  color: var(--color-text-muted);
}

.breadcrumb li:not(:last-child)::after {
  content: "›";
  margin-left: 6px;
  color: var(--color-border);
}

.breadcrumb a { color: var(--color-text-muted); }
.breadcrumb a:hover { color: var(--color-accent); }

/* ── メインコンテンツ ─────────────────────────────────── */
.site-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 20px 20px 80px;
}

.article-header {
  padding: 32px 0 12px;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 28px;
}

.article-meta {
  color: var(--color-text-muted);
  font-size: 0.85rem;
}

.lede {
  font-size: 1.05rem;
  color: var(--color-text-muted);
}

/* ── カード / 比較コンポーネント ─────────────────────────── */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 16px;
  margin: 1.6em 0;
}

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
}

.card h3 { margin-top: 0; }

.rank-card {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 22px;
  margin: 1.4em 0;
}

.rank-card__badge {
  flex: none;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-accent), var(--color-accent-2));
  color: #05121f;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1.1rem;
}

.rank-card__body { flex: 1; }
.rank-card h3 { margin-top: 0; }

.table-wrap {
  overflow-x: auto;
  margin: 1.6em 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

table.compare-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 560px;
  font-size: 0.92rem;
}

table.compare-table th,
table.compare-table td {
  padding: 12px 14px;
  border-bottom: 1px solid var(--color-border);
  text-align: left;
  white-space: nowrap;
}

table.compare-table thead th {
  background: var(--color-surface-alt);
  color: #fff;
  position: sticky;
  top: 0;
}

table.compare-table tbody tr:hover {
  background: rgba(34, 211, 238, 0.06);
}

.badge {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 700;
  background: rgba(34, 211, 238, 0.15);
  color: var(--color-accent);
}

.callout {
  background: var(--color-surface);
  border-left: 4px solid var(--color-accent-2);
  border-radius: var(--radius-sm);
  padding: 16px 18px;
  margin: 1.6em 0;
  color: var(--color-text);
}

.callout--warning {
  border-left-color: var(--color-warning);
}

.toc {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 18px 22px;
  margin: 1.6em 0;
}

.toc p { margin: 0 0 0.6em; font-weight: 700; color: #fff; }
.toc ol { margin: 0; padding-left: 1.2em; }

/* ── CTAボタン ───────────────────────────────────────── */
.cta-button {
  display: inline-block;
  padding: 12px 26px;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--color-accent), var(--color-accent-strong));
  color: #05121f;
  font-weight: 800;
  font-size: 0.95rem;
  text-decoration: none;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.cta-button:hover {
  color: #05121f;
  text-decoration: none;
  transform: translateY(-2px);
  box-shadow: 0 10px 24px rgba(34, 211, 238, 0.35);
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 1.4em 0;
}

/* ── フッター ───────────────────────────────────────── */
.site-footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  margin-top: 60px;
}

.site-footer__inner {
  display: grid;
  grid-template-columns: 1.4fr repeat(4, 1fr);
  gap: 28px;
  padding: 48px 20px;
}

.site-footer__logo { font-size: 1.2rem; font-weight: 800; color: #fff; margin: 0 0 0.6em; }
.site-footer__desc { color: var(--color-text-muted); font-size: 0.88rem; }
.site-footer__heading { color: #fff; font-weight: 700; margin: 0 0 0.6em; }
.site-footer__heading a { color: inherit; }
.site-footer__col ul { list-style: none; padding: 0; margin: 0; }
.site-footer__col li { margin-bottom: 0.4em; }
.site-footer__col a { color: var(--color-text-muted); font-size: 0.86rem; }
.site-footer__col a:hover { color: var(--color-accent); }

.site-footer__bottom {
  border-top: 1px solid var(--color-border);
  padding: 18px 20px;
  color: var(--color-text-muted);
  font-size: 0.78rem;
}

/* ── トップページ Hero ───────────────────────────────── */
.hero {
  padding: 64px 0 40px;
  text-align: center;
  background: radial-gradient(ellipse at top, rgba(34, 211, 238, 0.12), transparent 60%);
}

.hero h1 {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
}

.hero p {
  max-width: 640px;
  margin: 0 auto 1.6em;
  color: var(--color-text-muted);
}

.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 18px;
  margin: 2em 0;
}

.category-card {
  display: block;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: border-color 0.15s ease, transform 0.15s ease;
}

.category-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-3px);
  text-decoration: none;
}

.category-card h3 { margin: 0 0 0.4em; color: #fff; }
.category-card p { margin: 0; color: var(--color-text-muted); font-size: 0.88rem; }

/* ── 管理画面(admin) ───────────────────────────────────── */
.admin-page {
  max-width: 960px;
  margin: 0 auto;
  padding: 40px 20px;
}

.admin-login {
  max-width: 360px;
  margin: 80px auto;
  padding: 32px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.admin-form-row {
  margin-bottom: 16px;
}

.admin-form-row label {
  display: block;
  margin-bottom: 6px;
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.admin-form-row input,
.admin-form-row textarea,
.admin-form-row select {
  width: 100%;
  padding: 10px 12px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text);
  font-size: 0.95rem;
}

.admin-table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.4em 0;
}

.admin-table th, .admin-table td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--color-border);
  font-size: 0.88rem;
  text-align: left;
}

.btn {
  display: inline-block;
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  background: var(--color-surface-alt);
  color: var(--color-text);
  cursor: pointer;
  font-size: 0.9rem;
}

.btn:hover { border-color: var(--color-accent); color: var(--color-accent); text-decoration: none; }

.btn--primary {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: #05121f;
  font-weight: 700;
}

.btn--danger {
  border-color: #f87171;
  color: #f87171;
  background: transparent;
}

.flash {
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  margin-bottom: 20px;
  font-size: 0.9rem;
}

.flash--success { background: rgba(52, 211, 153, 0.15); color: var(--color-success); }
.flash--error { background: rgba(248, 113, 113, 0.15); color: #f87171; }

/* ── レスポンシブ ───────────────────────────────────── */
@media (max-width: 900px) {
  .site-footer__inner { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 720px) {
  .nav-toggle { display: flex; }

  .site-nav {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    max-height: calc(100vh - var(--header-height));
    overflow-y: auto;
  }

  .site-nav.is-open { display: block; }

  .site-nav > ul {
    flex-direction: column;
    height: auto;
    padding: 10px;
  }

  .site-nav__item { flex-direction: column; align-items: stretch; }

  .site-nav__submenu {
    position: static;
    display: none;
    box-shadow: none;
    border: none;
    background: var(--color-surface-alt);
    margin-top: 4px;
  }

  .site-nav__item.is-open .site-nav__submenu { display: block; }

  .site-footer__inner { grid-template-columns: 1fr; }
}