@charset "UTF-8";
/* =========================================================================
   ccna.css — CCNA 学習講座 専用スタイル
   トーン：ネットワーク = 青系で爽やか
   配置 ：/ccna/ccna.css
   依存 ：/styles.css （共通）
   ========================================================================= */

/* ------------------------------
   1. CSS Variables
   ------------------------------ */
.ccna-body {
  /* メインカラー（深い青 → 明るいスカイブルー） */
  --ccna-primary:        #0369a1;   /* sky-700 */
  --ccna-primary-strong: #075985;   /* sky-800 */
  --ccna-primary-soft:   #0ea5e9;   /* sky-500 */
  --ccna-accent:         #38bdf8;   /* sky-400 */
  --ccna-accent-light:   #7dd3fc;   /* sky-300 */
  --ccna-accent-bg:      #e0f2fe;   /* sky-100 */
  --ccna-accent-bg-soft: #f0f9ff;   /* sky-50 */

  /* 文字色 */
  --ccna-ink:            #0f172a;   /* slate-900 */
  --ccna-ink-soft:       #334155;   /* slate-700 */
  --ccna-ink-muted:      #64748b;   /* slate-500 */
  --ccna-ink-faint:      #94a3b8;   /* slate-400 */

  /* 背景・線 */
  --ccna-bg:             #ffffff;
  --ccna-bg-tint:        #f8fafc;   /* slate-50 */
  --ccna-bg-deep:        #f1f5f9;   /* slate-100 */
  --ccna-border:         #e2e8f0;   /* slate-200 */
  --ccna-border-strong:  #cbd5e1;   /* slate-300 */

  /* シャドウ */
  --ccna-shadow-sm: 0 1px 2px rgba(2, 132, 199, 0.06), 0 1px 3px rgba(15, 23, 42, 0.04);
  --ccna-shadow-md: 0 6px 16px rgba(2, 132, 199, 0.08), 0 2px 6px rgba(15, 23, 42, 0.04);
  --ccna-shadow-lg: 0 16px 40px rgba(2, 132, 199, 0.12), 0 4px 10px rgba(15, 23, 42, 0.05);

  /* グラデーション */
  --ccna-gradient-hero: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 50%, #bae6fd 100%);
  --ccna-gradient-cta:  linear-gradient(135deg, #0369a1 0%, #0ea5e9 100%);

  /* タイポ */
  --ccna-font-jp:   'Noto Sans JP', sans-serif;
  --ccna-font-en:   'Instrument Serif', 'Noto Serif JP', serif;
  --ccna-font-mono: 'JetBrains Mono', 'Courier New', monospace;

  /* レイアウト */
  --ccna-radius-sm: 8px;
  --ccna-radius-md: 14px;
  --ccna-radius-lg: 20px;

  background: var(--ccna-bg);
  color: var(--ccna-ink);
  font-family: var(--ccna-font-jp);
  -webkit-font-smoothing: antialiased;
  line-height: 1.8;
}

/* ============================================================
   ダークモード — CSS変数を上書きするだけで全体に波及する設計
   ============================================================ */
[data-theme="dark"] .ccna-body {
  --ccna-primary:        #38bdf8;
  --ccna-primary-strong: #7dd3fc;
  --ccna-primary-soft:   #38bdf8;
  --ccna-accent:         #38bdf8;
  --ccna-accent-light:   #7dd3fc;
  --ccna-accent-bg:      rgba(56, 189, 248, 0.15);
  --ccna-accent-bg-soft: rgba(56, 189, 248, 0.08);

  --ccna-ink:            #e2e8f0;
  --ccna-ink-soft:       #cbd5e1;
  --ccna-ink-muted:      #94a3b8;
  --ccna-ink-faint:      #64748b;

  --ccna-bg:             #0f172a;
  --ccna-bg-tint:        #1e293b;
  --ccna-bg-deep:        #1a2332;
  --ccna-border:         #334155;
  --ccna-border-strong:  #475569;

  --ccna-shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3), 0 1px 3px rgba(0, 0, 0, 0.2);
  --ccna-shadow-md: 0 6px 16px rgba(0, 0, 0, 0.35), 0 2px 6px rgba(0, 0, 0, 0.25);
  --ccna-shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.45), 0 4px 10px rgba(0, 0, 0, 0.3);

  --ccna-gradient-hero: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #1a2f4a 100%);
  --ccna-gradient-cta:  linear-gradient(135deg, #0ea5e9 0%, #38bdf8 100%);
}

/* ダークモード時の細かな調整 */
[data-theme="dark"] .ccna-hero-meta {
  background: rgba(15, 23, 42, 0.6);
  border-color: rgba(56, 189, 248, 0.3);
}
[data-theme="dark"] .ccna-hero-mascot-frame {
  background: rgba(15, 23, 42, 0.6);
}
[data-theme="dark"] .ccna-stage-num {
  background: var(--ccna-bg-deep);
}
[data-theme="dark"] .ccna-stage-status-prep {
  background: rgba(146, 64, 14, 0.3);
  color: #fbbf24;
}
[data-theme="dark"] .ccna-stage-status-ready {
  background: rgba(22, 101, 52, 0.3);
  color: #4ade80;
}

/* 共通：本文側だけ余裕のある最大幅 */
.ccna-body .ccna-narrow {
  max-width: 760px;
  margin-left: auto;
  margin-right: auto;
}

/* ------------------------------
   2. セクション共通
   ------------------------------ */
.ccna-section-head {
  text-align: center;
  margin-bottom: 56px;
}
.ccna-section-label {
  display: inline-block;
  font-family: var(--ccna-font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  color: var(--ccna-primary);
  background: var(--ccna-accent-bg);
  padding: 6px 14px;
  border-radius: 999px;
  margin-bottom: 20px;
}
.ccna-section-title {
  font-size: clamp(1.6rem, 3.4vw, 2.4rem);
  font-weight: 700;
  line-height: 1.45;
  color: var(--ccna-ink);
  letter-spacing: 0.02em;
  margin: 0 0 18px;
}
.ccna-section-sub {
  font-size: 0.98rem;
  color: var(--ccna-ink-soft);
  line-height: 1.9;
  max-width: 640px;
  margin: 0 auto;
}

/* ------------------------------
   3. ボタン
   ------------------------------ */
.ccna-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: 999px;
  font-size: 0.94rem;
  font-weight: 500;
  text-decoration: none;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease, color 0.2s ease;
  border: 1.5px solid transparent;
  cursor: pointer;
}
.ccna-btn-primary {
  background: var(--ccna-gradient-cta);
  color: #ffffff;
  box-shadow: var(--ccna-shadow-md);
}
.ccna-btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--ccna-shadow-lg);
  color: #ffffff;
}
.ccna-btn-ghost {
  background: transparent;
  color: var(--ccna-primary);
  border-color: var(--ccna-border-strong);
}
.ccna-btn-ghost:hover {
  background: var(--ccna-accent-bg-soft);
  border-color: var(--ccna-primary);
  color: var(--ccna-primary-strong);
}
.ccna-btn-large {
  padding: 16px 32px;
  font-size: 1rem;
}

/* ------------------------------
   4. HERO
   ------------------------------ */
.ccna-hero {
  position: relative;
  padding: 70px 0 70px;
  background: var(--ccna-gradient-hero);
  overflow: hidden;
}
.ccna-hero-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.7;
}
.ccna-hero-network {
  width: 100%;
  height: 100%;
}
.ccna-hero-inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.7fr 1fr;
  gap: 60px;
  align-items: center;
}
.ccna-hero-text {
  min-width: 0;
}
.ccna-kicker {
  font-family: var(--ccna-font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.18em;
  color: var(--ccna-primary);
  margin-bottom: 18px;
  text-transform: uppercase;
}
.ccna-hero-title {
  font-size: clamp(2rem, 5vw, 3.4rem);
  font-weight: 700;
  line-height: 1.35;
  letter-spacing: 0.02em;
  color: var(--ccna-ink);
  margin: 0 0 28px;
}
.ccna-hero-accent {
  background: linear-gradient(120deg, var(--ccna-primary) 0%, var(--ccna-primary-soft) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.ccna-hero-lead {
  font-size: 0.98rem;
  line-height: 1.9;
  color: var(--ccna-ink-soft);
  margin: 0 0 24px;
}
.ccna-hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  margin-bottom: 24px;
  padding: 14px 20px;
  background: rgba(255, 255, 255, 0.6);
  border: 1px solid rgba(56, 189, 248, 0.25);
  border-radius: var(--ccna-radius-md);
  backdrop-filter: blur(6px);
}
.ccna-hero-meta-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.ccna-hero-meta-label {
  font-family: var(--ccna-font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--ccna-ink-muted);
  text-transform: uppercase;
}
.ccna-hero-meta-value {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--ccna-ink);
}
.ccna-hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

/* マスコットエリア（ゆみちゃん） */
.ccna-hero-mascot {
  margin: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
}
.ccna-hero-mascot-frame {
  position: relative;
  width: 100%;
  max-width: 160px;
  aspect-ratio: 1/1;
  border-radius: var(--ccna-radius-lg);
  overflow: hidden;
  background: rgba(255, 255, 255, 0.55);
  border: 1px solid rgba(56, 189, 248, 0.35);
  box-shadow: var(--ccna-shadow-lg);
  backdrop-filter: blur(6px);
}
.ccna-hero-mascot-frame img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
  padding: 12px;
}
.ccna-hero-mascot-placeholder {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  align-content: center;
  gap: 8px;
  background:
    radial-gradient(circle at 30% 30%, rgba(125, 211, 252, 0.5), transparent 60%),
    radial-gradient(circle at 70% 80%, rgba(14, 165, 233, 0.35), transparent 55%),
    linear-gradient(135deg, #f0f9ff, #bae6fd);
}
.ccna-hero-mascot-placeholder-label {
  font-family: var(--ccna-font-en);
  font-size: 3rem;
  letter-spacing: 0.08em;
  color: var(--ccna-primary-strong);
}
.ccna-hero-mascot-placeholder-sub {
  font-family: var(--ccna-font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--ccna-primary);
  text-transform: uppercase;
}
.ccna-hero-mascot-caption {
  font-family: var(--ccna-font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.16em;
  color: var(--ccna-ink-muted);
  text-transform: uppercase;
}

/* ------------------------------
   5. ABOUT
   ------------------------------ */
.ccna-about {
  padding: 100px 0 80px;
  background: var(--ccna-bg);
}
.ccna-about-text p {
  font-size: 1rem;
  line-height: 2;
  color: var(--ccna-ink-soft);
  margin: 0 0 1.4em;
}
.ccna-about-text p:last-child { margin-bottom: 0; }
.ccna-about-text strong {
  color: var(--ccna-ink);
  font-weight: 700;
  background: linear-gradient(transparent 65%, var(--ccna-accent-bg) 65%);
  padding: 0 2px;
}
.ccna-about-text em {
  font-style: normal;
  color: var(--ccna-primary-strong);
  font-weight: 500;
}
.ccna-inline-link {
  color: var(--ccna-primary);
  text-decoration: none;
  border-bottom: 1px solid var(--ccna-accent);
  padding-bottom: 1px;
  transition: color 0.2s ease, border-color 0.2s ease;
}
.ccna-inline-link:hover {
  color: var(--ccna-primary-strong);
  border-bottom-color: var(--ccna-primary-strong);
}

/* ------------------------------
   5-2. About — ターゲット文言ブロック
   ------------------------------ */
.ccna-target {
  margin-top: 36px;
  padding: 26px 28px;
  background: var(--ccna-accent-bg-soft);
  border: 1px solid rgba(56, 189, 248, 0.3);
  border-left: 4px solid var(--ccna-primary-soft);
  border-radius: var(--ccna-radius-md);
}
.ccna-target-label {
  font-family: var(--ccna-font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  color: var(--ccna-primary);
  margin-bottom: 14px;
  text-transform: uppercase;
}
.ccna-target-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}
.ccna-target-list li {
  position: relative;
  padding-left: 24px;
  font-size: 0.95rem;
  line-height: 1.85;
  color: var(--ccna-ink-soft);
}
.ccna-target-list li::before {
  content: '';
  position: absolute;
  left: 4px;
  top: 0.65em;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--ccna-accent);
  box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.2);
}

@media (max-width: 640px) {
  .ccna-target {
    padding: 20px 22px;
  }
  .ccna-target-list li {
    font-size: 0.9rem;
  }
}

/* ------------------------------
   6. ROADMAP
   ------------------------------ */
.ccna-roadmap {
  padding: 100px 0;
  background: var(--ccna-bg-tint);
  position: relative;
}
.ccna-roadmap-list {
  list-style: none;
  margin: 0;
  padding: 0;
  max-width: 920px;
  margin: 0 auto;
}
.ccna-stage {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: 24px;
  position: relative;
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.ccna-stage.is-visible {
  opacity: 1;
  transform: translateY(0);
}
.ccna-stage + .ccna-stage {
  margin-top: 32px;
}

/* マーカー（番号 + 縦ライン） */
.ccna-stage-marker {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
}
.ccna-stage-num {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: var(--ccna-bg);
  border: 2px solid var(--ccna-accent);
  color: var(--ccna-primary);
  font-family: var(--ccna-font-en);
  font-size: 1.5rem;
  letter-spacing: 0.04em;
  box-shadow: 0 0 0 6px rgba(56, 189, 248, 0.12);
  z-index: 1;
  flex-shrink: 0;
}
.ccna-stage-line {
  flex-grow: 1;
  width: 2px;
  background: linear-gradient(to bottom, var(--ccna-accent), var(--ccna-accent-light));
  margin-top: 8px;
  border-radius: 2px;
}
.ccna-stage-line-end {
  background: linear-gradient(to bottom, var(--ccna-accent), transparent);
}

/* ステージカード */
.ccna-stage-card {
  background: var(--ccna-bg);
  border: 1px solid var(--ccna-border);
  border-radius: var(--ccna-radius-md);
  padding: 28px 30px 30px;
  box-shadow: var(--ccna-shadow-sm);
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}
.ccna-stage-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--ccna-shadow-md);
  border-color: var(--ccna-accent);
}
.ccna-stage-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 14px;
}
.ccna-stage-tag {
  font-family: var(--ccna-font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.18em;
  color: var(--ccna-primary);
  text-transform: uppercase;
}
.ccna-stage-status {
  font-family: var(--ccna-font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  padding: 4px 10px;
  border-radius: 999px;
  background: var(--ccna-bg-deep);
  color: var(--ccna-ink-muted);
}
.ccna-stage-status-prep {
  background: #fef3c7;
  color: #92400e;
}
.ccna-stage-status-ready {
  background: #dcfce7;
  color: #166534;
}
.ccna-stage-title {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--ccna-ink);
  margin: 0 0 12px;
  line-height: 1.5;
  letter-spacing: 0.02em;
}
.ccna-stage-desc {
  font-size: 0.95rem;
  line-height: 1.9;
  color: var(--ccna-ink-soft);
  margin: 0 0 18px;
}
.ccna-stage-topics {
  list-style: none;
  margin: 0;
  padding: 16px 18px;
  background: var(--ccna-accent-bg-soft);
  border-radius: var(--ccna-radius-sm);
  display: grid;
  gap: 6px;
}
.ccna-stage-topics li {
  position: relative;
  padding-left: 18px;
  font-size: 0.88rem;
  color: var(--ccna-ink-soft);
  line-height: 1.7;
}
.ccna-stage-topics li::before {
  content: '';
  position: absolute;
  left: 4px;
  top: 0.7em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--ccna-accent);
}

/* ステージCTAボタン */
.ccna-stage-action {
  margin-top: 22px;
  display: flex;
  justify-content: flex-end;
}
.ccna-stage-cta {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 22px;
  border-radius: 999px;
  font-size: 0.92rem;
  font-weight: 500;
  text-decoration: none;
  color: #ffffff;
  background: var(--ccna-gradient-cta);
  border: 1.5px solid transparent;
  box-shadow: var(--ccna-shadow-sm);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  cursor: pointer;
  min-height: 44px;
}
.ccna-stage-cta svg {
  transition: transform 0.25s ease;
}
.ccna-stage-card:hover {
  border-color: var(--ccna-border-strong);
}

.ccna-stage-cta:hover svg {
  transform: translateX(3px);
}

/* 準備中（無効化）状態 */
.ccna-stage-cta-disabled {
  background: var(--ccna-bg-deep);
  color: var(--ccna-ink-muted);
  box-shadow: none;
  cursor: not-allowed;
  pointer-events: none;
}
.ccna-stage-cta-disabled:hover {
  transform: none;
  box-shadow: none;
  color: var(--ccna-ink-muted);
}

/* ------------------------------
   7. WHAT IS CCNA
   ------------------------------ */
.ccna-what {
  padding: 100px 0;
  background: var(--ccna-bg);
}
.ccna-what-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }
.ccna-what-card {
  background: var(--ccna-bg);
  border: 1px solid var(--ccna-border);
  border-radius: var(--ccna-radius-md);
  padding: 32px 28px;
  position: relative;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.ccna-what-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--ccna-shadow-md);
}
.ccna-what-card-num {
  font-family: var(--ccna-font-en);
  font-size: 1.8rem;
  color: var(--ccna-accent);
  margin-bottom: 12px;
  letter-spacing: 0.04em;
}
.ccna-what-card-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--ccna-ink);
  margin: 0 0 12px;
  line-height: 1.5;
}
.ccna-what-card-text {
  font-size: 0.9rem;
  line-height: 1.85;
  color: var(--ccna-ink-soft);
  margin: 0;
}
.ccna-what-card-text strong {
  color: var(--ccna-primary-strong);
  font-weight: 700;
}

/* ------------------------------
   8. CTA
   ------------------------------ */
.ccna-cta {
  padding: 100px 0;
  background: var(--ccna-gradient-cta);
  position: relative;
  overflow: hidden;
}
.ccna-cta::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 20% 30%, rgba(255, 255, 255, 0.15), transparent 50%),
    radial-gradient(circle at 80% 70%, rgba(255, 255, 255, 0.08), transparent 50%);
  pointer-events: none;
}
.ccna-cta-inner {
  position: relative;
  text-align: center;
  color: #ffffff;
}
.ccna-cta-title {
  font-size: clamp(1.4rem, 3vw, 2rem);
  font-weight: 700;
  margin: 0 0 16px;
  letter-spacing: 0.02em;
}
.ccna-cta-sub {
  font-size: 0.98rem;
  line-height: 1.9;
  margin: 0 0 32px;
  opacity: 0.95;
}
.ccna-cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  justify-content: center;
}
.ccna-cta .ccna-btn-primary {
  background: #ffffff;
  color: var(--ccna-primary-strong);
}
.ccna-cta .ccna-btn-primary:hover {
  background: #ffffff;
  color: var(--ccna-primary-strong);
  transform: translateY(-2px);
}
.ccna-cta .ccna-btn-ghost {
  color: #ffffff;
  border-color: rgba(255, 255, 255, 0.5);
}
.ccna-cta .ccna-btn-ghost:hover {
  background: rgba(255, 255, 255, 0.12);
  color: #ffffff;
  border-color: #ffffff;
}

/* ------------------------------
   9. レスポンシブ
   ------------------------------ */
@media (max-width: 960px) {
  .ccna-hero {
    padding: 60px 0 60px;
  }
  .ccna-hero-inner {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .ccna-hero-mascot {
    order: -1;
  }
  .ccna-hero-mascot-frame {
    max-width: 180px;
  }
}

@media (max-width: 640px) {
  .ccna-hero { padding: 50px 0 50px; }
  .ccna-about,
  .ccna-roadmap,
  .ccna-what,
  .ccna-cta { padding: 70px 0; }
  .ccna-section-head { margin-bottom: 40px; }
  .ccna-hero-meta {
    flex-direction: column;
    gap: 14px;
  }
  /* What — スマホでは番号と本文を横並びに */
  .ccna-what-grid {
    gap: 12px;
  }
  .ccna-what-card {
    display: grid;
    grid-template-columns: 56px 1fr;
    gap: 16px;
    padding: 22px 22px;
    align-items: start;
  }
  .ccna-what-card-num {
    font-size: 2rem;
    margin-bottom: 0;
    line-height: 1;
    padding-top: 4px;
  }
  .ccna-what-card-title {
    grid-column: 2;
    font-size: 1rem;
    margin-bottom: 8px;
  }
  .ccna-what-card-text {
    grid-column: 2;
    font-size: 0.88rem;
    line-height: 1.8;
  }
  .ccna-stage {
    grid-template-columns: 56px 1fr;
    gap: 16px;
  }
  .ccna-stage-num {
    width: 44px;
    height: 44px;
    font-size: 1.2rem;
  }
  .ccna-stage-card {
    padding: 22px 20px;
  }
  .ccna-stage-title {
    font-size: 1.2rem;
  }
  .ccna-stage-action {
    margin-top: 18px;
    justify-content: stretch;
  }
  .ccna-stage-cta {
    width: 100%;
    justify-content: center;
    padding: 14px 20px;
    font-size: 0.95rem;
  }
  .ccna-btn {
    padding: 11px 20px;
    font-size: 0.9rem;
  }
  .ccna-btn-large {
    padding: 14px 26px;
    font-size: 0.95rem;
  }

}

/* ============================================================
   テーマ切り替えボタン（埋め込み式）
   ============================================================ */
.ccna-theme-toggle {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: transparent;
  border: 1.5px solid var(--ccna-border-strong);
  color: var(--ccna-primary);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  transition: background 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}
.ccna-theme-toggle:hover {
  background: var(--ccna-accent-bg-soft);
  border-color: var(--ccna-primary);
  transform: rotate(15deg);
}
.ccna-theme-toggle svg {
  width: 16px;
  height: 16px;
}
.ccna-theme-toggle .icon-moon {
  display: block;
}
.ccna-theme-toggle .icon-sun {
  display: none;
}
[data-theme="dark"] .ccna-theme-toggle .icon-moon {
  display: none;
}
[data-theme="dark"] .ccna-theme-toggle .icon-sun {
  display: block;
}
[data-theme="dark"] .ccna-theme-toggle:hover {
  background: rgba(56, 189, 248, 0.15);
}

/* ヒーロー右上に埋め込むテーマ切り替え位置 */
.ccna-hero-toggle-wrap {
  position: absolute;
  top: 50px;
  right: 24px;
  z-index: 5;
}
@media (max-width: 960px) {
  .ccna-hero-toggle-wrap {
    top: 20px;
    right: 20px;
  }
}
@media (max-width: 640px) {
  .ccna-hero-toggle-wrap {
    top: 20px;
    right: 16px;
  }
}

/* ============================================================
   ポータルヘッダー移行対応 / ダークモード scoped オーバーライド
   ============================================================
   旧ヘッダーは position:fixed（高さ約80px）だったため、
   .ccna-hero / .lesson-header に大きめの padding-top を確保していた。
   新ポータルヘッダー（partials/header.php）は非固定
   （position指定なし・高さ56px）のため詰めた（本ファイル上部で調整済み）。
   ポータルヘッダー/フッターは白固定（portal-shared.css）だが、
   ccna/spfx のダークモード時（[data-theme="dark"]）は白いままだと
   浮いてしまうため、既存のダークパレットに合わせて上書きする。
   ============================================================ */
html[data-theme="dark"] .site-header {
  background: var(--ccna-bg-tint);
  border-bottom-color: var(--ccna-border);
}
html[data-theme="dark"] .site-header .brand img {
  /* ダーク時は座布団を敷かず、ロゴそのまま + 淡い光彩で浮かせる */
  filter: drop-shadow(0 0 5px rgba(255, 255, 255, 0.28));
}
html[data-theme="dark"] .site-catch {
  color: var(--ccna-ink-muted);
}
html[data-theme="dark"] .site-catch strong {
  color: var(--ccna-primary);
}
html[data-theme="dark"] .btn-h {
  border-color: var(--ccna-border);
}
html[data-theme="dark"] .btn-h.ghost {
  background: var(--ccna-bg-tint);
  color: var(--ccna-ink);
}
html[data-theme="dark"] .btn-h.ghost:hover {
  border-color: var(--ccna-primary);
  color: var(--ccna-primary);
}
html[data-theme="dark"] .btn-h.solid {
  background: var(--ccna-primary);
  border-color: var(--ccna-primary);
  color: #0f172a;
}
html[data-theme="dark"] .btn-h.solid:hover {
  background: var(--ccna-primary-strong);
  border-color: var(--ccna-primary-strong);
}
html[data-theme="dark"] .site-footer {
  background: var(--ccna-bg-tint);
  border-top-color: var(--ccna-border);
}
html[data-theme="dark"] .footer-inner {
  color: var(--ccna-ink-faint);
}
html[data-theme="dark"] .footer-links a:hover {
  color: var(--ccna-primary);
}