/* =====================================================================
   ゆうちゃんのオンライン将棋教室 - style.css
   ---------------------------------------------------------------------
   設計方針:
   - CSS変数によるトークン管理（色・余白・角丸・影・タイポグラフィ）
   - BEMに近い命名規則（block__element--modifier）
   - モバイルファースト（320pxから崩れないことを確認）
   - Bootstrap / Tailwind 等のフレームワークは不使用
   ===================================================================== */

/* ---------------------------------------------------------------------
   1. リセット & 基本設定
   --------------------------------------------------------------------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

/* JavaScriptでスムーススクロールのoffset制御を行うため、
   モーション低減を希望するユーザーには自動スクロールを無効化 */
@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;
  }
}

body {
  margin: 0;
  padding: 0;
}

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

a {
  color: inherit;
}

button {
  font-family: inherit;
}

/* ---------------------------------------------------------------------
   2. デザイントークン（CSS変数）
   --------------------------------------------------------------------- */
:root {
  /* カラー */
  --color-primary: #0f3d91;       /* メインカラー：紺 */
  --color-primary-rgb: 15, 61, 145;
  --color-secondary: #153e75;     /* サブカラー：濃紺 */
  --color-accent: #c9a227;        /* アクセント：金（背景・枠線用） */
  --color-accent-rgb: 201, 162, 39;
  --color-accent-text: #8a6d1f;   /* アクセント金の文字用（白背景でコントラスト比AA以上を確保） */
  --color-bg: #f8fafc;            /* 背景 */
  --color-surface: #ffffff;       /* カード等の背景 */
  --color-text: #222222;          /* 本文文字色 */
  --color-text-soft: #555b66;     /* 補足文字色 */
  --color-border: #e6e9ef;        /* 罫線 */

  /* 影 */
  --shadow-sm: 0 2px 8px rgba(15, 30, 60, 0.06);
  --shadow-md: 0 8px 24px rgba(15, 30, 60, 0.10);
  --shadow-lg: 0 16px 40px rgba(15, 30, 60, 0.14);

  /* 角丸 */
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-full: 999px;

  /* 余白 */
  --space-section: clamp(64px, 10vw, 120px);
  --space-card: 28px;

  /* レイアウト */
  --container-width: 1200px;

  /* タイポグラフィ */
  --font-base: "Noto Sans JP", "Hiragino Sans", "Yu Gothic", "Meiryo", sans-serif;
  --line-height-body: 1.8;

  /* ヘッダー高さ（スムーススクロールのoffset計算に使用） */
  --header-height: 76px;
}

/* ---------------------------------------------------------------------
   3. ベーススタイル
   --------------------------------------------------------------------- */
body {
  font-family: var(--font-base);
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: var(--line-height-body);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3 {
  font-weight: 700;
  line-height: 1.4;
  margin: 0 0 0.6em;
  color: var(--color-secondary);
}

h1 {
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 800;
  line-height: 1.35;
}

h2 {
  font-size: clamp(1.6rem, 3.6vw, 2.3rem);
  font-weight: 700;
}

h3 {
  font-size: clamp(1.1rem, 2.4vw, 1.35rem);
  font-weight: 600;
}

p {
  margin: 0 0 1em;
  color: var(--color-text);
}

.section__lead {
  color: var(--color-text-soft);
  font-size: 1.05rem;
  max-width: 680px;
}

/* 見出しの上に添える小さなラベル（アイキャッチ用ではなく、区分を示すため） */
.section__eyebrow {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--color-accent);
  margin-bottom: 0.8em;
}

/* ---------------------------------------------------------------------
   4. レイアウトユーティリティ
   --------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--container-width);
  margin-inline: auto;
  padding-inline: 24px;
}

.section {
  padding-block: var(--space-section);
}

/* ヒーローセクションを持たないページ（ブログ・プライバシーポリシー等）では、
   固定ヘッダーの高さ分だけ本文の開始位置を下げて、重なりを防ぐ */
main > .section:first-child {
  padding-top: calc(var(--space-section) + var(--header-height));
}

.section--alt {
  background-color: #f1f4f9;
}

.section__header {
  text-align: center;
  max-width: 720px;
  margin-inline: auto;
  margin-bottom: 56px;
}

.section__header .section__lead {
  margin-inline: auto;
}

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

/* スキップリンク（アクセシビリティ対応） */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--color-primary);
  color: #fff;
  padding: 12px 20px;
  z-index: 2000;
  border-radius: 0 0 var(--radius-sm) 0;
}

.skip-link:focus {
  left: 0;
}

/* フォーカスリング（キーボード操作対応） */
a:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
}

/* ---------------------------------------------------------------------
   5. ボタン
   --------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 56px;
  padding: 14px 32px;
  font-size: 1rem;
  font-weight: 700;
  border-radius: var(--radius-full);
  border: 2px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: transform 0.18s ease, box-shadow 0.18s ease, background-color 0.18s ease, color 0.18s ease;
  box-shadow: var(--shadow-sm);
  white-space: nowrap;
}

.btn:active {
  transform: translateY(1px) scale(0.99);
}

.btn--primary {
  background-color: var(--color-accent);
  color: #1a1a1a;
}

.btn--primary:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
  background-color: #d9b23e;
}

.btn--outline {
  background-color: transparent;
  border-color: rgba(255, 255, 255, 0.7);
  color: inherit;
}

.btn--outline:hover {
  background-color: rgba(255, 255, 255, 0.12);
  transform: translateY(-2px);
}

.btn--secondary {
  background-color: var(--color-primary);
  color: #fff;
}

.btn--secondary:hover {
  background-color: var(--color-secondary);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.btn--block {
  width: 100%;
}

.btn--large {
  min-height: 64px;
  padding: 16px 44px;
  font-size: 1.1rem;
}

/* ---------------------------------------------------------------------
   6. ヘッダー
   --------------------------------------------------------------------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-height);
  display: flex;
  align-items: center;
  background-color: transparent;
  transition: background-color 0.3s ease, box-shadow 0.3s ease;
}

.site-header.is-scrolled {
  background-color: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(8px);
  box-shadow: var(--shadow-sm);
}

.site-header__inner {
  width: 100%;
  max-width: var(--container-width);
  margin-inline: auto;
  padding-inline: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.site-header__brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--color-secondary);
  font-weight: 700;
  font-size: 1.05rem;
}

.site-header:not(.is-scrolled) .site-header__brand {
  color: #ffffff;
}

.site-header__logo {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
}

.site-header__brand-text {
  line-height: 1.2;
}

.site-header__brand-sub {
  display: block;
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  color: var(--color-accent);
}

/* ナビゲーション（PC） */
.site-nav {
  display: none;
}

@media (min-width: 1024px) {
  .site-nav {
    display: flex;
    align-items: center;
    gap: 32px;
  }

  .site-nav__list {
    display: flex;
    gap: 28px;
    list-style: none;
    margin: 0;
    padding: 0;
  }

  .site-nav__link {
    text-decoration: none;
    font-weight: 600;
    font-size: 0.94rem;
    color: inherit;
    position: relative;
    padding-block: 6px;
  }

  .site-header:not(.is-scrolled) .site-nav__link {
    color: #ffffff;
  }

  .site-nav__link::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-accent);
    transition: width 0.25s ease;
  }

  .site-nav__link:hover::after,
  .site-nav__link.is-active::after {
    width: 100%;
  }

  .site-header__cta {
    margin-left: 8px;
  }
}

/* ハンバーガーメニュー（スマホ・タブレット） */
.hamburger {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  border: none;
  background: transparent;
  cursor: pointer;
  z-index: 1100;
}

@media (min-width: 1024px) {
  .hamburger {
    display: none;
  }
}

.hamburger__bar {
  width: 26px;
  height: 2px;
  background-color: var(--color-secondary);
  transition: transform 0.3s ease, opacity 0.3s ease, background-color 0.3s ease;
  border-radius: var(--radius-full);
}

.site-header:not(.is-scrolled) .hamburger__bar {
  background-color: #ffffff;
}

.hamburger.is-open .hamburger__bar {
  background-color: var(--color-secondary);
}

.hamburger.is-open .hamburger__bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.hamburger.is-open .hamburger__bar:nth-child(2) {
  opacity: 0;
}

.hamburger.is-open .hamburger__bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.mobile-nav {
  position: fixed;
  inset: 0;
  background-color: rgba(15, 30, 60, 0.98);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1050;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}

.mobile-nav.is-open {
  opacity: 1;
  visibility: visible;
}

.mobile-nav__list {
  list-style: none;
  margin: 0;
  padding: 0;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.mobile-nav__link {
  color: #ffffff;
  text-decoration: none;
  font-size: 1.4rem;
  font-weight: 700;
}

@media (min-width: 1024px) {
  .mobile-nav {
    display: none;
  }
}

/* ---------------------------------------------------------------------
   7. ヒーローセクション
   --------------------------------------------------------------------- */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: center;
  color: #ffffff;
  overflow: hidden;
}

.hero__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 0;
}

.hero__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(10, 25, 60, 0.72) 0%, rgba(10, 25, 60, 0.55) 45%, rgba(10, 25, 60, 0.82) 100%);
  z-index: 1;
}

.hero__inner {
  position: relative;
  z-index: 2;
  width: 100%;
  max-width: var(--container-width);
  margin-inline: auto;
  padding: calc(var(--header-height) + 24px) 24px 80px;
}

.hero__copy {
  max-width: 640px;
}

.hero__eyebrow {
  display: inline-block;
  padding: 6px 16px;
  border-radius: var(--radius-full);
  border: 1px solid rgba(255, 255, 255, 0.4);
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  margin-bottom: 24px;
}

.hero__title {
  color: #ffffff;
  margin-bottom: 0.5em;
}

.hero__subtitle {
  font-size: 1.1rem;
  color: rgba(255, 255, 255, 0.9);
  max-width: 520px;
  margin-bottom: 2.2em;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.hero__scroll {
  position: absolute;
  left: 50%;
  bottom: 32px;
  transform: translateX(-50%);
  z-index: 2;
  color: #ffffff;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-decoration: none;
  opacity: 0.85;
  animation: fadeInOut 2.6s ease-in-out infinite;
}

.hero__scroll-icon {
  width: 22px;
  height: 34px;
  border: 2px solid rgba(255, 255, 255, 0.75);
  border-radius: var(--radius-full);
  position: relative;
}

.hero__scroll-icon::after {
  content: "";
  position: absolute;
  top: 6px;
  left: 50%;
  width: 4px;
  height: 8px;
  background-color: #ffffff;
  border-radius: var(--radius-full);
  transform: translateX(-50%);
  animation: scrollDot 1.8s ease-in-out infinite;
}

@keyframes scrollDot {
  0% { transform: translate(-50%, 0); opacity: 1; }
  70% { transform: translate(-50%, 12px); opacity: 0; }
  100% { transform: translate(-50%, 0); opacity: 0; }
}

@keyframes fadeInOut {
  0%, 100% { opacity: 0.5; }
  50% { opacity: 1; }
}

/* ---------------------------------------------------------------------
   8. カード共通スタイル
   --------------------------------------------------------------------- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}

.card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-card);
  box-shadow: var(--shadow-sm);
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
}

.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
  border-color: rgba(var(--color-accent-rgb), 0.4);
}

.card__icon {
  width: 52px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  background-color: rgba(var(--color-primary-rgb), 0.08);
  color: var(--color-primary);
  margin-bottom: 20px;
}

.card__icon svg {
  width: 26px;
  height: 26px;
  stroke: currentColor;
}

.card__title {
  margin-bottom: 0.5em;
}

.card__text {
  color: var(--color-text-soft);
  font-size: 0.96rem;
  margin-bottom: 0;
}

/* ガラス風カード（CTAなど濃い背景上で使用） */
.card--glass {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.18);
  backdrop-filter: blur(10px);
  color: #ffffff;
}

.card--glass .card__text {
  color: rgba(255, 255, 255, 0.85);
}

/* スクロールで表示するフェード演出（IntersectionObserverで.is-visibleを付与） */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal--left {
  transform: translateX(-32px);
}

.reveal--left.is-visible {
  transform: translateX(0);
}

.reveal--right {
  transform: translateX(32px);
}

.reveal--right.is-visible {
  transform: translateX(0);
}

.reveal-stagger > * {
  transition-delay: calc(var(--stagger-index, 0) * 90ms);
}

/* ---------------------------------------------------------------------
   9. レッスン内容セクション
   --------------------------------------------------------------------- */
.lesson {
  display: grid;
  gap: 40px;
  align-items: center;
}

@media (min-width: 900px) {
  .lesson {
    grid-template-columns: 1fr 1fr;
  }

  .lesson--reverse .lesson__media {
    order: 2;
  }
}

.lesson__media {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

.lesson__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.lesson__badge {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--color-primary);
  background-color: rgba(var(--color-primary-rgb), 0.08);
  padding: 6px 14px;
  border-radius: var(--radius-full);
  margin-bottom: 16px;
}

.lesson__list {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.lesson__list li {
  display: flex;
  gap: 10px;
  color: var(--color-text-soft);
  font-size: 0.98rem;
}

.lesson__list li::before {
  content: "";
  flex-shrink: 0;
  width: 8px;
  height: 8px;
  margin-top: 8px;
  border-radius: var(--radius-full);
  background-color: var(--color-accent);
}

.lesson__extra {
  margin-top: 32px;
  padding-top: 28px;
  border-top: 1px dashed var(--color-border);
}

.lesson__extra-label {
  display: block;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-text-soft);
  margin-bottom: 16px;
}

.lesson__extra-grid {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.lesson__extra-item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  background-color: #eef2f8;
  border-radius: var(--radius-md);
  padding: 18px 20px;
}

.lesson__extra-icon {
  flex-shrink: 0;
  width: 38px;
  height: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  background-color: rgba(var(--color-primary-rgb), 0.1);
  color: var(--color-primary);
}

.lesson__extra-icon svg {
  width: 20px;
  height: 20px;
  stroke: currentColor;
}

.lesson__extra-title {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-weight: 700;
  color: var(--color-secondary);
  margin: 0 0 6px;
  font-size: 0.98rem;
}

.lesson__extra-desc {
  font-size: 0.88rem;
  color: var(--color-text-soft);
  margin: 0;
}

/* ---------------------------------------------------------------------
   10. 実績カードグリッド
   --------------------------------------------------------------------- */
.achievement-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 20px;
  max-width: 900px;
  margin-inline: auto;
}

.achievement-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 28px 20px;
  text-align: center;
  box-shadow: var(--shadow-sm);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.achievement-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
}

.achievement-card__icon {
  width: 48px;
  height: 48px;
  margin-inline: auto;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
  background-color: rgba(var(--color-accent-rgb), 0.14);
  color: var(--color-accent-text);
}

.achievement-card__icon svg {
  width: 24px;
  height: 24px;
  stroke: currentColor;
}

.achievement-card__value {
  font-size: clamp(1.3rem, 2.6vw, 1.6rem);
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1.3;
  margin: 0 0 6px;
}

.achievement-card__label {
  color: var(--color-text-soft);
  font-size: 0.86rem;
  margin: 0;
  line-height: 1.5;
}

/* ---------------------------------------------------------------------
   11. プロフィールセクション
   --------------------------------------------------------------------- */
.profile {
  display: grid;
  gap: 40px;
  align-items: center;
  justify-items: center;
  text-align: center;
}

@media (min-width: 800px) {
  .profile {
    grid-template-columns: 260px 1fr;
    text-align: left;
    justify-items: start;
  }
}

.profile__photo {
  width: 200px;
  height: 200px;
  border-radius: var(--radius-full);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  border: 6px solid #ffffff;
  flex-shrink: 0;
}

.profile__photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.profile__name {
  margin-bottom: 0.2em;
}

.profile__role {
  color: var(--color-accent);
  font-weight: 700;
  font-size: 0.95rem;
  margin-bottom: 1em;
  display: block;
}

.profile__achievements {
  margin-top: 64px;
  padding-top: 48px;
  border-top: 1px solid var(--color-border);
}

.profile__achievements-title {
  text-align: center;
  margin-bottom: 40px;
}

/* ---------------------------------------------------------------------
   12. 料金テーブル
   --------------------------------------------------------------------- */
.pricing {
  display: grid;
  gap: 24px;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  max-width: 620px;
  margin-inline: auto;
}

.pricing__card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 32px 28px;
  text-align: center;
  position: relative;
  box-shadow: var(--shadow-sm);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.pricing__card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
}

.pricing__name {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-secondary);
  margin-bottom: 12px;
}

.pricing__price {
  font-size: clamp(2.4rem, 6vw, 3.4rem);
  font-weight: 800;
  color: var(--color-accent-text);
  margin-bottom: 4px;
  line-height: 1.15;
}

.pricing__price span:first-child {
  font-size: 0.55em;
  font-weight: 700;
  color: var(--color-primary);
}

.pricing__desc {
  color: var(--color-text-soft);
  font-size: 0.92rem;
  margin-bottom: 0;
}

.pricing__card--trial {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.pricing__trial-icon {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
  background-color: rgba(var(--color-accent-rgb), 0.14);
  color: var(--color-accent-text);
  margin-bottom: 16px;
}

.pricing__trial-icon svg {
  width: 26px;
  height: 26px;
  stroke: currentColor;
}

.pricing__trial-copy {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-secondary);
  margin-bottom: 10px;
  line-height: 1.5;
}

/* ---------------------------------------------------------------------
   13. FAQ アコーディオン
   --------------------------------------------------------------------- */
.faq-list {
  max-width: 760px;
  margin-inline: auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.faq-item {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.faq-item__question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 20px 24px;
  background: none;
  border: none;
  text-align: left;
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-secondary);
  cursor: pointer;
}

.faq-item__icon {
  flex-shrink: 0;
  width: 22px;
  height: 22px;
  position: relative;
}

.faq-item__icon::before,
.faq-item__icon::after {
  content: "";
  position: absolute;
  background-color: var(--color-accent);
  border-radius: var(--radius-full);
  transition: transform 0.3s ease;
}

.faq-item__icon::before {
  width: 100%;
  height: 2px;
  top: 50%;
  left: 0;
  transform: translateY(-50%);
}

.faq-item__icon::after {
  width: 2px;
  height: 100%;
  left: 50%;
  top: 0;
  transform: translateX(-50%);
}

.faq-item__question[aria-expanded="true"] .faq-item__icon::after {
  transform: translateX(-50%) rotate(90deg);
  opacity: 0;
}

.faq-item__answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.35s ease;
  padding: 0 24px;
}

.faq-item__answer p {
  color: var(--color-text-soft);
  padding-bottom: 20px;
  margin: 0;
}

.faq-item__question[aria-expanded="true"] + .faq-item__answer {
  padding-top: 0;
}

/* ---------------------------------------------------------------------
   14. CTA セクション
   --------------------------------------------------------------------- */
.cta {
  position: relative;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
  color: #ffffff;
  text-align: center;
  padding-block: var(--space-section);
  overflow: hidden;
}

.cta__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 0;
}

.cta__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(15, 61, 145, 0.92) 0%, rgba(10, 30, 70, 0.9) 100%);
  z-index: 1;
}

.cta__content {
  position: relative;
  z-index: 2;
}

.cta__title {
  color: #ffffff;
  margin-bottom: 0.4em;
}

.cta__text {
  color: rgba(255, 255, 255, 0.88);
  max-width: 520px;
  margin-inline: auto;
  margin-bottom: 2em;
}

.cta__note {
  margin-top: 16px;
  margin-bottom: 0;
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.72);
}

/* ---------------------------------------------------------------------
   15. フッター
   --------------------------------------------------------------------- */
.site-footer {
  background-color: #0c1f3d;
  color: rgba(255, 255, 255, 0.75);
  padding-block: 56px 32px;
}

.site-footer__inner {
  display: grid;
  gap: 32px;
  grid-template-columns: 1fr;
}

@media (min-width: 768px) {
  .site-footer__inner {
    grid-template-columns: 2fr 1fr 1fr;
  }
}

.site-footer__emblem {
  width: 96px;
  height: 96px;
  margin-bottom: 20px;
  padding: 8px;
  background-color: #ffffff;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}

.site-footer__emblem img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.site-footer__brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: #ffffff;
  font-weight: 700;
  margin-bottom: 12px;
}

.site-footer__logo {
  width: 34px;
  height: 34px;
  border-radius: var(--radius-full);
}

.site-footer__desc {
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.6);
  max-width: 340px;
}

.site-footer__heading {
  color: #ffffff;
  font-size: 0.9rem;
  font-weight: 700;
  margin-bottom: 16px;
  letter-spacing: 0.04em;
}

.site-footer__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.site-footer__list a {
  color: rgba(255, 255, 255, 0.75);
  text-decoration: none;
  font-size: 0.92rem;
}

.site-footer__list a:hover {
  color: var(--color-accent);
}

.site-footer__sns {
  display: flex;
  gap: 14px;
}

.site-footer__sns a {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
  background-color: rgba(255, 255, 255, 0.08);
  color: #ffffff;
  transition: background-color 0.2s ease, transform 0.2s ease;
}

.site-footer__sns a:hover {
  background-color: var(--color-accent);
  color: #1a1a1a;
  transform: translateY(-3px);
}

.site-footer__sns svg {
  width: 18px;
  height: 18px;
}

.site-footer__bottom {
  margin-top: 40px;
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  text-align: center;
  font-size: 0.82rem;
  color: rgba(255, 255, 255, 0.5);
}

/* ---------------------------------------------------------------------
   16. トップへ戻るボタン
   --------------------------------------------------------------------- */
.scroll-top {
  position: fixed;
  right: 20px;
  bottom: 24px;
  width: 48px;
  height: 48px;
  border-radius: var(--radius-full);
  background-color: var(--color-primary);
  color: #ffffff;
  border: none;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: var(--shadow-md);
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity 0.3s ease, transform 0.3s ease, visibility 0.3s ease, background-color 0.2s ease;
  z-index: 900;
}

.scroll-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.scroll-top:hover {
  background-color: var(--color-secondary);
}

.scroll-top svg {
  width: 20px;
  height: 20px;
}

/* ---------------------------------------------------------------------
   17. レスポンシブ調整（ブレークポイント: 320 / 480 / 768 / 1024 / 1280）
   --------------------------------------------------------------------- */
@media (max-width: 480px) {
  .container {
    padding-inline: 18px;
  }

  .hero__actions {
    flex-direction: column;
  }

  .hero__actions .btn {
    width: 100%;
  }
}

@media (min-width: 1280px) {
  .container {
    padding-inline: 32px;
  }
}

/* ---------------------------------------------------------------------
   19. ブログ一覧・記事ページ
   --------------------------------------------------------------------- */
.blog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 28px;
}

.blog-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.blog-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
}

.blog-card__link {
  display: block;
  text-decoration: none;
  color: inherit;
}

.blog-card__thumb {
  aspect-ratio: 16 / 9;
  overflow: hidden;
}

.blog-card__thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.blog-card__body {
  padding: 20px 22px 24px;
}

.blog-card__meta {
  font-size: 0.82rem;
  color: var(--color-text-soft);
  margin-bottom: 8px;
}

.blog-card__title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-secondary);
  margin-bottom: 8px;
  line-height: 1.5;
}

.blog-card__excerpt {
  font-size: 0.9rem;
  color: var(--color-text-soft);
  margin: 0;
}

/* 記事ページ */
.blog-post {
  max-width: 760px;
}

.blog-post__breadcrumb {
  font-size: 0.85rem;
  color: var(--color-text-soft);
  margin-bottom: 32px;
}

.blog-post__breadcrumb a {
  color: var(--color-primary);
  text-decoration: none;
}

.blog-post__header {
  margin-bottom: 28px;
}

.blog-post__meta {
  font-size: 0.85rem;
  color: var(--color-text-soft);
  margin-bottom: 8px;
}

.blog-post__thumb {
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-bottom: 32px;
  box-shadow: var(--shadow-sm);
}

.blog-post__thumb img {
  width: 100%;
  height: auto;
  object-fit: cover;
}

.blog-post__body h2 {
  margin-top: 1.6em;
}

.blog-post__body h3 {
  margin-top: 1.3em;
}

.blog-post__cta {
  margin-top: 48px;
  padding: 28px;
  background-color: #eef2f8;
  border-radius: var(--radius-md);
  text-align: center;
}

.blog-post__cta p {
  margin-bottom: 16px;
  color: var(--color-secondary);
  font-weight: 600;
}

.blog-post__back {
  margin-top: 32px;
}

.blog-post__back a {
  color: var(--color-primary);
  text-decoration: none;
  font-weight: 600;
}

/* ---------------------------------------------------------------------
   20. 法的ページ（プライバシーポリシー・特定商取引法表記）
   --------------------------------------------------------------------- */
.legal-page {
  max-width: 800px;
}

.legal-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 32px;
}

.legal-table th,
.legal-table td {
  text-align: left;
  padding: 16px 12px;
  border-bottom: 1px solid var(--color-border);
  vertical-align: top;
}

.legal-table th {
  width: 35%;
  color: var(--color-secondary);
  font-weight: 700;
  font-size: 0.92rem;
}

.legal-table td {
  color: var(--color-text-soft);
  font-size: 0.92rem;
  line-height: 1.8;
}

.legal-page__back {
  margin-top: 40px;
}

.legal-page__back a {
  color: var(--color-primary);
  text-decoration: none;
  font-weight: 600;
}

@media (max-width: 480px) {
  .legal-table th,
  .legal-table td {
    display: block;
    width: 100%;
  }

  .legal-table th {
    padding-bottom: 4px;
    border-bottom: none;
  }

  .legal-table td {
    padding-top: 0;
  }
}

/* 印刷時の簡易対応 */
@media print {
  .site-header,
  .hero__scroll,
  .scroll-top,
  .mobile-nav {
    display: none !important;
  }
}