/* ==========================================================
   天の川式そろばんアカデミー - スタイルシート
   ========================================================== */

/* ---------- リセット・ベース ---------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: 'Noto Sans JP', sans-serif;
  color: #333333;
  background-color: #ffffff;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: inherit;
  text-decoration: none;
}

ul {
  list-style: none;
}

/* ---------- カラー変数 ---------- */
:root {
  --clr-primary:       #F97316;
  --clr-primary-dark:  #C2570A;
  --clr-primary-hover: #EA6C0A;
  --clr-primary-light: #FB923C;
  --clr-primary-pale:  #FFF7ED;
  --clr-primary-mid:   #FFEDD5;
  --clr-text:          #333333;
  --clr-text-sub:      #555555;
  --clr-text-muted:    #777777;
  --clr-bg-gray:       #F9FAFB;
  --clr-white:         #ffffff;
  --clr-border:        #E5E7EB;
  --shadow-sm:         0 2px 10px rgba(0,0,0,0.07);
  --shadow-md:         0 6px 24px rgba(0,0,0,0.10);
  --shadow-lg:         0 12px 40px rgba(0,0,0,0.13);
  --radius-sm:         8px;
  --radius-md:         14px;
  --radius-lg:         22px;
  --radius-pill:       999px;
  --ease:              0.25s ease;
}

/* ---------- コンテナ ---------- */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- セクション共通 ---------- */
section {
  padding: 88px 0;
}

.section-eyebrow {
  text-align: center;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--clr-primary);
  text-transform: uppercase;
  margin-bottom: 10px;
}

.section-title {
  font-size: clamp(1.5rem, 3.2vw, 2.1rem);
  font-weight: 900;
  color: #1C1917;
  text-align: center;
  margin-bottom: 12px;
  letter-spacing: -0.01em;
}

.section-title span {
  color: var(--clr-primary);
}

.section-lead {
  text-align: center;
  color: var(--clr-text-muted);
  font-size: 0.92rem;
  margin-bottom: 56px;
  line-height: 1.85;
}

/* ---------- ボタン ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 28px;
  border-radius: var(--radius-pill);
  font-family: 'Noto Sans JP', sans-serif;
  font-weight: 700;
  font-size: 0.95rem;
  cursor: pointer;
  border: none;
  transition: background var(--ease), transform var(--ease), box-shadow var(--ease);
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.btn-primary {
  background: var(--clr-primary);
  color: var(--clr-white);
  box-shadow: 0 4px 16px rgba(249,115,22,0.35);
}

.btn-primary:hover {
  background: var(--clr-primary-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 22px rgba(249,115,22,0.45);
}

/* ---------- フェードイン ---------- */
.fade-in {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 0.65s ease, transform 0.65s ease;
}
.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}


/* ==========================================================
   ヘッダー
   ========================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--clr-white);
  border-bottom: 1px solid transparent;
  transition: border-color var(--ease), box-shadow var(--ease);
}

.site-header.scrolled {
  border-color: var(--clr-border);
  box-shadow: 0 2px 16px rgba(0,0,0,0.08);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

/* ロゴ */
.site-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

/* logo.png がない場合も高さを確保 */
.logo-img {
  height: 42px;
  width: auto;
  object-fit: contain;
}

.logo-text {
  line-height: 1.25;
}

.logo-text-ja {
  display: block;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--clr-primary);
  white-space: nowrap;
}

.logo-text-en {
  display: block;
  font-size: 0.65rem;
  font-weight: 400;
  color: var(--clr-text-muted);
  letter-spacing: 0.07em;
  white-space: nowrap;
}

/* PCナビ */
.pc-nav ul {
  display: flex;
  align-items: center;
  gap: 28px;
}

.pc-nav a {
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--clr-text-sub);
  position: relative;
  padding-bottom: 3px;
  transition: color var(--ease);
}

.pc-nav a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--clr-primary);
  border-radius: 2px;
  transition: width var(--ease);
}

.pc-nav a:hover {
  color: var(--clr-primary);
}

.pc-nav a:hover::after {
  width: 100%;
}

.nav-line-btn {
  background: var(--clr-primary) !important;
  color: var(--clr-white) !important;
  padding: 8px 20px !important;
  border-radius: var(--radius-pill) !important;
  transition: background var(--ease), transform var(--ease) !important;
}

.nav-line-btn::after {
  display: none !important;
}

.nav-line-btn:hover {
  background: var(--clr-primary-hover) !important;
  transform: translateY(-1px) !important;
}

/* ハンバーガー */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}

.hamburger span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--clr-text);
  border-radius: 2px;
  transition: transform var(--ease), opacity var(--ease);
}

.hamburger.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* モバイルナビ */
.mobile-nav {
  display: none;
  position: fixed;
  top: 68px;
  left: 0;
  right: 0;
  background: var(--clr-white);
  border-top: 1px solid var(--clr-border);
  box-shadow: var(--shadow-md);
  padding: 20px 24px 28px;
  z-index: 999;
}

.mobile-nav.open {
  display: block;
}

.mobile-nav li a {
  display: block;
  padding: 15px 0;
  font-size: 0.97rem;
  font-weight: 500;
  border-bottom: 1px solid var(--clr-border);
  color: var(--clr-text);
  transition: color var(--ease);
}

.mobile-nav li:last-child a {
  border-bottom: none;
}

.mobile-nav li a:hover {
  color: var(--clr-primary);
}

.mobile-nav-cta {
  margin-top: 22px;
}

.mobile-nav-cta .btn {
  width: 100%;
}


/* ==========================================================
   ヒーローセクション
   ========================================================== */
.hero {
  position: relative;
  min-height: 580px;
  display: flex;
  align-items: center;
  /* hero-bg.jpg を背景画像として使用。画像がない場合はフォールバックカラーで表示 */
  background-color: #C2570A; /* 画像読み込み前・失敗時のフォールバック */
  background-image: url('hero-bg.jpg');
  background-size: cover;
  background-position: center;
  overflow: hidden;
}

/* オレンジの半透明オーバーレイ（テキスト視認性を確保） */
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.4);
  z-index: 0;
}

/* 装飾サークル */
.hero-deco {
  position: absolute;
  border-radius: 50%;
  pointer-events: none;
}

.hero-deco-1 {
  width: 520px;
  height: 520px;
  right: -160px;
  top: -160px;
  background: rgba(255,255,255,0.07);
}

.hero-deco-2 {
  width: 320px;
  height: 320px;
  right: 80px;
  bottom: -120px;
  background: rgba(255,255,255,0.05);
}

.hero-inner {
  position: relative;
  z-index: 1;
  max-width: 700px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(255,255,255,0.22);
  border: 1px solid rgba(255,255,255,0.38);
  color: var(--clr-white);
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  padding: 6px 16px;
  border-radius: var(--radius-pill);
  margin-bottom: 22px;
}

.hero-title {
  font-size: clamp(2rem, 5vw, 3.4rem);
  font-weight: 900;
  color: var(--clr-white);
  line-height: 1.25;
  margin-bottom: 22px;
  letter-spacing: -0.02em;
  text-shadow: 0 2px 10px rgba(0,0,0,0.12);
}

.hero-title em {
  font-style: normal;
  text-decoration: underline;
  text-decoration-color: rgba(255,255,255,0.55);
  text-underline-offset: 6px;
  text-decoration-thickness: 3px;
}

.hero-desc {
  font-size: clamp(0.92rem, 1.8vw, 1.02rem);
  color: rgba(255,255,255,0.92);
  line-height: 2;
  margin-bottom: 38px;
  max-width: 560px;
}

.hero-cta {
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
}

.btn-hero {
  background: var(--clr-white);
  color: var(--clr-primary);
  font-weight: 700;
  font-size: 1.05rem;
  padding: 16px 36px;
  border-radius: var(--radius-pill);
  display: inline-flex;
  align-items: center;
  gap: 10px;
  box-shadow: 0 4px 22px rgba(0,0,0,0.18);
  transition: background var(--ease), transform var(--ease), box-shadow var(--ease);
}

.btn-hero:hover {
  background: var(--clr-primary-pale);
  transform: translateY(-3px);
  box-shadow: 0 8px 30px rgba(0,0,0,0.24);
}

.hero-note {
  font-size: 0.8rem;
  color: rgba(255,255,255,0.78);
  display: flex;
  align-items: center;
  gap: 6px;
}


/* ==========================================================
   こんな方におすすめ
   ========================================================== */
.recommend {
  background: var(--clr-bg-gray);
}

.recommend-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
}

.rec-card {
  background: var(--clr-white);
  border-radius: var(--radius-md);
  padding: 36px 22px 30px;
  text-align: center;
  box-shadow: var(--shadow-sm);
  transition: transform var(--ease), box-shadow var(--ease);
}

.rec-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.rec-icon {
  width: 64px;
  height: 64px;
  background: var(--clr-primary-pale);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 18px;
}

.rec-icon i {
  font-size: 1.6rem;
  color: var(--clr-primary);
}

.rec-card h3 {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--clr-text);
  line-height: 1.65;
}


/* ==========================================================
   選ばれる4つの理由
   ========================================================== */
.features {
  background: var(--clr-white);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}

.feat-item {
  display: flex;
  flex-direction: column;
  gap: 18px;
  background: var(--clr-white);
  border-radius: var(--radius-md);
  padding: 40px 36px;
  border-top: 4px solid var(--clr-primary);
  box-shadow: var(--shadow-sm);
  transition: transform var(--ease), box-shadow var(--ease);
}

.feat-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

/* アイコン単体表示（四角の背景なし） */
.feat-icon-wrap {
  width: auto;
  height: auto;
  min-width: unset;
  background: none;
  border-radius: 0;
  display: block;
}

.feat-icon-wrap i {
  font-size: 3rem; /* 約48px */
  color: var(--clr-primary);
}

.feat-body h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--clr-primary-dark);
  margin-bottom: 12px;
  line-height: 1.5;
}

.feat-body p {
  font-size: 0.9rem;
  color: var(--clr-text-sub);
  line-height: 1.8;
}


/* ==========================================================
   コース紹介
   ========================================================== */
.courses {
  background: var(--clr-bg-gray);
}

.courses-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  align-items: start;
}

/* コースカード */
.course-card {
  background: var(--clr-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: transform var(--ease), box-shadow var(--ease);
}

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

/* おすすめカード */
.course-card.featured {
  border: 2.5px solid var(--clr-primary);
  transform: translateY(-4px);
}

.course-card.featured:hover {
  transform: translateY(-10px);
}

/* おすすめバッジ */
.badge-rec {
  position: absolute;
  top: 14px;
  right: 14px;
  background: var(--clr-primary);
  color: var(--clr-white);
  font-size: 0.7rem;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  letter-spacing: 0.06em;
}

/* カードヘッダー部 */
.card-head {
  background: var(--clr-primary-mid);
  padding: 26px 24px 20px;
  text-align: center;
}

.card-head.featured {
  background: linear-gradient(135deg, var(--clr-primary), var(--clr-primary-light));
}

.card-head.featured .card-name,
.card-head.featured .card-target {
  color: var(--clr-white);
}

.card-name {
  font-size: 1rem;
  font-weight: 700;
  color: var(--clr-primary-dark);
  line-height: 1.45;
  margin-bottom: 8px;
}

.card-target {
  font-size: 0.78rem;
  color: var(--clr-text-muted);
  line-height: 1.65;
}

/* 価格 */
.card-price-block {
  padding: 18px 24px;
  text-align: center;
  border-bottom: 1px solid var(--clr-border);
  background: var(--clr-white);
}

.card-price {
  font-size: 2.1rem;
  font-weight: 900;
  color: var(--clr-primary);
  letter-spacing: -0.02em;
  line-height: 1;
}

.card-price sup {
  font-size: 1rem;
  font-weight: 700;
  vertical-align: top;
  margin-top: 4px;
  display: inline-block;
}

.card-price-note {
  font-size: 0.75rem;
  color: var(--clr-text-muted);
  margin-top: 5px;
}

/* サービス提供期間バッジ */
.card-period {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  background: var(--clr-primary-pale);
  border: 1px solid var(--clr-primary-mid);
  color: var(--clr-primary-dark);
  font-size: 0.74rem;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  margin-top: 8px;
}

/* カード本体 */
.card-body {
  padding: 22px 24px 0;
  flex: 1;
}

.card-body h4 {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--clr-text-muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 12px;
}

.card-list {
  display: flex;
  flex-direction: column;
  gap: 9px;
  margin-bottom: 18px;
}

.card-list li {
  display: flex;
  align-items: flex-start;
  gap: 9px;
  font-size: 0.865rem;
  color: var(--clr-text-sub);
  line-height: 1.65;
}

.card-list li i {
  color: var(--clr-primary);
  font-size: 0.85rem;
  margin-top: 3px;
  flex-shrink: 0;
}

/* 注意書き */
.card-notes {
  border-top: 1px solid var(--clr-border);
  padding: 14px 0;
  margin-bottom: 4px;
}

.card-notes p {
  font-size: 0.76rem;
  color: var(--clr-text-muted);
  line-height: 1.75;
}

/* フッター */
.card-foot {
  padding: 16px 24px 24px;
  text-align: center;
}

.card-foot .btn {
  width: 100%;
}


/* ==========================================================
   学びのステップ
   ========================================================== */
.steps {
  background: var(--clr-white);
}

.steps-wrap {
  max-width: 640px;
  margin: 0 auto;
  position: relative;
}

/* 縦ライン */
.steps-wrap::before {
  content: '';
  position: absolute;
  left: 27px;
  top: 30px;
  bottom: 30px;
  width: 2px;
  background: linear-gradient(to bottom, var(--clr-primary-light), var(--clr-primary-mid));
  border-radius: 2px;
  z-index: 0;
}

.step-row {
  display: flex;
  gap: 26px;
  align-items: flex-start;
  margin-bottom: 36px;
  position: relative;
  z-index: 1;
}

.step-row:last-child {
  margin-bottom: 0;
}

.step-num-wrap {
  width: 56px;
  height: 56px;
  min-width: 56px;
  background: var(--clr-primary);
  border-radius: 50%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--clr-white);
  font-weight: 900;
  line-height: 1;
  gap: 1px;
  box-shadow: 0 4px 16px rgba(249,115,22,0.38);
}

.step-label {
  font-size: 0.57rem;
  letter-spacing: 0.08em;
  font-weight: 700;
}

.step-n {
  font-size: 1.15rem;
}

.step-content {
  padding-top: 8px;
}

.step-content h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--clr-text);
  margin-bottom: 5px;
}

.step-content p {
  font-size: 0.875rem;
  color: var(--clr-text-muted);
  line-height: 1.75;
}


/* ==========================================================
   CTAセクション
   ========================================================== */
.cta-sec {
  background: linear-gradient(135deg, var(--clr-primary) 0%, var(--clr-primary-light) 100%);
  padding: 84px 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-sec-deco {
  position: absolute;
  border-radius: 50%;
  pointer-events: none;
}

.cta-sec-deco-1 {
  width: 420px;
  height: 420px;
  left: -130px;
  bottom: -130px;
  background: rgba(255,255,255,0.06);
}

.cta-sec-deco-2 {
  width: 280px;
  height: 280px;
  right: -60px;
  top: -60px;
  background: rgba(255,255,255,0.05);
}

.cta-sec .container {
  position: relative;
  z-index: 1;
}

.cta-sec h2 {
  font-size: clamp(1.6rem, 3.5vw, 2.3rem);
  font-weight: 900;
  color: var(--clr-white);
  margin-bottom: 14px;
}

.cta-sec p {
  font-size: clamp(0.88rem, 1.5vw, 1rem);
  color: rgba(255,255,255,0.88);
  line-height: 1.9;
  margin-bottom: 36px;
  max-width: 500px;
  margin-left: auto;
  margin-right: auto;
}

.btn-cta {
  background: var(--clr-white);
  color: var(--clr-primary);
  font-size: 1.05rem;
  font-weight: 700;
  padding: 17px 46px;
  border-radius: var(--radius-pill);
  display: inline-flex;
  align-items: center;
  gap: 10px;
  box-shadow: 0 4px 22px rgba(0,0,0,0.18);
  transition: background var(--ease), transform var(--ease), box-shadow var(--ease);
}

.btn-cta:hover {
  background: var(--clr-primary-pale);
  transform: translateY(-3px);
  box-shadow: 0 8px 30px rgba(0,0,0,0.24);
}


/* ==========================================================
   フッター
   ========================================================== */
.site-footer {
  background: #1C1917;
  color: rgba(255,255,255,0.65);
}

.footer-inner {
  padding: 56px 0 0;
}

.footer-brand {
  text-align: center;
  padding-bottom: 36px;
  border-bottom: 1px solid rgba(255,255,255,0.10);
}

.footer-name-ja {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--clr-white);
  margin-bottom: 4px;
}

.footer-name-en {
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: rgba(255,255,255,0.4);
}

.footer-links {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 10px 36px;
  padding: 30px 0;
  border-bottom: 1px solid rgba(255,255,255,0.10);
}

.footer-links a {
  font-size: 0.82rem;
  color: rgba(255,255,255,0.55);
  transition: color var(--ease);
  display: inline-flex;
  align-items: center;
  gap: 5px;
}

.footer-links a:hover {
  color: var(--clr-primary-light);
}

.footer-copyright {
  padding: 22px 0;
  text-align: center;
}

.footer-copyright p {
  font-size: 0.75rem;
  color: rgba(255,255,255,0.35);
}


/* ==========================================================
   レスポンシブ
   ========================================================== */

/* タブレット */
@media (max-width: 1024px) {
  .recommend-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .courses-grid {
    grid-template-columns: 1fr;
    max-width: 500px;
    margin: 0 auto;
  }

  .course-card.featured {
    transform: none;
  }

  .course-card.featured:hover {
    transform: translateY(-6px);
  }
}

/* スマホ */
@media (max-width: 768px) {
  section {
    padding: 64px 0;
  }

  .pc-nav {
    display: none;
  }

  .hamburger {
    display: flex;
  }

  .hero {
    min-height: 500px;
  }

  .hero-cta {
    flex-direction: column;
    align-items: flex-start;
  }

  .recommend-grid {
    grid-template-columns: 1fr;
    max-width: 360px;
    margin: 0 auto;
  }

  .features-grid {
    grid-template-columns: 1fr;
  }

  .feat-item {
    padding: 32px 26px;
  }

  .courses-grid {
    max-width: 100%;
  }

  .steps-wrap::before {
    left: 23px;
  }

  .step-num-wrap {
    width: 48px;
    height: 48px;
    min-width: 48px;
  }

  .footer-links {
    flex-direction: column;
    align-items: center;
    gap: 14px;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 1.8rem;
  }

  .btn-hero {
    width: 100%;
    justify-content: center;
  }
}