/* ==========================================================================
   棚田精機 コーポレートサイト - スタイルシート
   ========================================================================== */

/* --------------------------------------------------------------------------
   Google Fonts
   -------------------------------------------------------------------------- */
@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+JP:wght@400;500;700&family=Montserrat:wght@400;600;700&display=swap');

/* --------------------------------------------------------------------------
   CSS カスタムプロパティ（デザイントークン）
   -------------------------------------------------------------------------- */
:root {
  --color-primary:  #1A3A5C;
  --color-accent:   #E67E22;
  --color-bg:       #FFFFFF;
  --color-bg-sub:   #F4F6F7;
  --color-text:     #2C3E50;
  --color-text-sub: #7F8C8D;

  --font-ja: 'Noto Sans JP', sans-serif;
  --font-en: 'Montserrat', sans-serif;

  --max-width: 1200px;
  --header-height: 72px;

  --transition: 0.3s ease;
  --shadow: 0 4px 16px rgba(0,0,0,0.08);
  --radius: 8px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-ja);
  color: var(--color-text);
  background: var(--color-bg);
  font-size: 16px;
  line-height: 1.7;
}

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

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

ul {
  list-style: none;
}

/* --------------------------------------------------------------------------
   レイアウト共通
   -------------------------------------------------------------------------- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 80px 0;
}

.section--sub {
  background: var(--color-bg-sub);
}

.section-header {
  text-align: center;
  margin-bottom: 56px;
}

.section-label {
  display: inline-block;
  font-family: var(--font-en);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 8px;
}

.section-title {
  font-size: clamp(22px, 3vw, 32px);
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: 0.05em;
}

.section-title::after {
  content: '';
  display: block;
  width: 48px;
  height: 3px;
  background: var(--color-accent);
  margin: 16px auto 0;
}

/* --------------------------------------------------------------------------
   フェードインアニメーション（IntersectionObserver）
   -------------------------------------------------------------------------- */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

.fade-in-delay-1 { transition-delay: 0.1s; }
.fade-in-delay-2 { transition-delay: 0.2s; }
.fade-in-delay-3 { transition-delay: 0.3s; }
.fade-in-delay-4 { transition-delay: 0.4s; }

/* --------------------------------------------------------------------------
   ボタン共通
   -------------------------------------------------------------------------- */
.btn {
  display: inline-block;
  padding: 14px 32px;
  border-radius: var(--radius);
  font-weight: 700;
  font-size: 15px;
  cursor: pointer;
  transition: opacity var(--transition), transform var(--transition);
  border: none;
  text-align: center;
}

.btn:hover {
  opacity: 0.85;
  transform: translateY(-2px);
}

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

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

.btn--outline {
  background: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}

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

.btn--outline-white {
  background: transparent;
  color: #fff;
  border: 2px solid #fff;
}

.btn--outline-white:hover {
  background: #fff;
  color: var(--color-primary);
}

/* --------------------------------------------------------------------------
   ヘッダー
   -------------------------------------------------------------------------- */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: #fff;
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
  height: var(--header-height);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  gap: 16px;
}

/* ロゴ */
.header-logo a {
  font-family: var(--font-ja);
  font-size: 22px;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: 0.08em;
  white-space: nowrap;
}

/* ナビゲーション */
.header-nav ul {
  display: flex;
  align-items: center;
  gap: 4px;
}

.header-nav a {
  display: block;
  padding: 8px 12px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text);
  border-radius: 4px;
  transition: color var(--transition), background var(--transition);
  white-space: nowrap;
}

.header-nav a:hover {
  color: var(--color-primary);
  background: var(--color-bg-sub);
}

/* 電話番号 */
.header-tel {
  font-family: var(--font-en);
  font-size: 15px;
  font-weight: 700;
  color: var(--color-primary);
  white-space: nowrap;
}

.header-tel a {
  color: var(--color-primary);
}

/* ハンバーガーボタン */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

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

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

/* スマホナビオーバーレイ */
.nav-overlay {
  display: none;
  position: fixed;
  inset: var(--header-height) 0 0 0;
  background: #fff;
  z-index: 99;
  padding: 24px;
  overflow-y: auto;
}

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

.nav-overlay ul {
  display: flex;
  flex-direction: column;
}

.nav-overlay a {
  display: block;
  padding: 16px 8px;
  font-size: 16px;
  font-weight: 500;
  color: var(--color-text);
  border-bottom: 1px solid var(--color-bg-sub);
}

.nav-overlay .overlay-tel {
  margin-top: 24px;
  font-family: var(--font-en);
  font-weight: 700;
  font-size: 18px;
  color: var(--color-primary);
  text-align: center;
}

/* --------------------------------------------------------------------------
   フッター
   -------------------------------------------------------------------------- */
.footer {
  background: var(--color-primary);
  color: #fff;
  padding: 60px 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 40px;
}

.footer-title {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 16px;
  letter-spacing: 0.05em;
}

.footer-info p {
  font-size: 14px;
  line-height: 1.9;
  color: rgba(255,255,255,0.8);
}

.footer-map ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-map a {
  font-size: 14px;
  color: rgba(255,255,255,0.8);
  transition: color var(--transition);
}

.footer-map a:hover {
  color: var(--color-accent);
}

.footer-cta {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-cta .btn {
  font-size: 14px;
  padding: 12px 20px;
  text-align: center;
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.15);
  padding: 20px 24px;
  text-align: center;
  font-size: 13px;
  color: rgba(255,255,255,0.5);
}

/* --------------------------------------------------------------------------
   ヒーローセクション（スライドショー）
   -------------------------------------------------------------------------- */
.hero {
  position: relative;
  height: calc(100vh - var(--header-height));
  min-height: 560px;
  overflow: hidden;
}

.hero-slides {
  position: relative;
  width: 100%;
  height: 100%;
}

.hero-slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity 1s ease;
}

.hero-slide.is-active {
  opacity: 1;
}

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

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(26,58,92,0.75) 0%, rgba(26,58,92,0.45) 100%);
}

.hero-content {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 24px;
  color: #fff;
}

.hero-since {
  font-family: var(--font-en);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 16px;
}

.hero-sub {
  font-family: var(--font-en);
  font-size: clamp(14px, 2vw, 18px);
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.85);
  margin-bottom: 20px;
}

.hero-title {
  font-size: clamp(26px, 4vw, 48px);
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: 0.06em;
  margin-bottom: 20px;
  text-shadow: 0 2px 8px rgba(0,0,0,0.3);
}

.hero-desc {
  font-size: clamp(14px, 1.5vw, 16px);
  color: rgba(255,255,255,0.85);
  max-width: 560px;
  margin-bottom: 36px;
}

.hero-btns {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  justify-content: center;
}

/* スライドインジケーター */
.hero-indicators {
  position: absolute;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 8px;
}

.hero-indicators button {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  border: none;
  background: rgba(255,255,255,0.4);
  cursor: pointer;
  transition: background var(--transition);
  padding: 0;
}

.hero-indicators button.is-active {
  background: var(--color-accent);
}

/* --------------------------------------------------------------------------
   強みセクション
   -------------------------------------------------------------------------- */
.strengths-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.strength-card {
  background: #fff;
  border-radius: var(--radius);
  padding: 32px 24px;
  text-align: center;
  box-shadow: var(--shadow);
  transition: transform var(--transition), box-shadow var(--transition);
}

.strength-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(0,0,0,0.12);
}

.strength-icon {
  font-size: 48px;
  margin-bottom: 16px;
  display: block;
}

.strength-card h3 {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 12px;
}

.strength-card p {
  font-size: 14px;
  color: var(--color-text-sub);
  line-height: 1.7;
}

/* --------------------------------------------------------------------------
   加工分野セクション
   -------------------------------------------------------------------------- */
.fields-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.field-card {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  aspect-ratio: 4/3;
  cursor: pointer;
}

.field-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.field-card:hover img {
  transform: scale(1.06);
}

.field-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(26,58,92,0.85) 0%, rgba(26,58,92,0.2) 60%);
  display: flex;
  align-items: flex-end;
  padding: 20px;
  transition: background var(--transition);
}

.field-card:hover .field-overlay {
  background: linear-gradient(to top, rgba(26,58,92,0.95) 0%, rgba(26,58,92,0.5) 60%);
}

.field-name {
  color: #fff;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.05em;
}

/* --------------------------------------------------------------------------
   製作実績ピックアップ
   -------------------------------------------------------------------------- */
.works-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 40px;
}

.work-card {
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: transform var(--transition);
}

.work-card:hover {
  transform: translateY(-4px);
}

.work-card img {
  width: 100%;
  aspect-ratio: 4/3;
  object-fit: cover;
}

.work-card-body {
  padding: 16px;
  background: #fff;
}

.work-card-body h4 {
  font-size: 14px;
  font-weight: 700;
  color: var(--color-primary);
}

.works-more {
  text-align: center;
}

/* --------------------------------------------------------------------------
   保有設備ピックアップ
   -------------------------------------------------------------------------- */
.facility-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-bottom: 40px;
}

.facility-card {
  text-align: center;
}

.facility-card img {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  border-radius: var(--radius);
  margin-bottom: 12px;
}

.facility-card p {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-primary);
}

.facility-more {
  text-align: center;
}

/* --------------------------------------------------------------------------
   お知らせセクション
   -------------------------------------------------------------------------- */
.news-list {
  max-width: 800px;
  margin: 0 auto 32px;
}

.news-item {
  display: flex;
  align-items: flex-start;
  gap: 20px;
  padding: 20px 0;
  border-bottom: 1px solid #E8ECEE;
  transition: color var(--transition);
}

.news-item:hover {
  color: var(--color-primary);
}

.news-date {
  font-family: var(--font-en);
  font-size: 13px;
  color: var(--color-text-sub);
  white-space: nowrap;
  padding-top: 2px;
  min-width: 90px;
}

.news-tag {
  display: inline-block;
  font-size: 11px;
  padding: 2px 10px;
  border-radius: 20px;
  background: var(--color-bg-sub);
  color: var(--color-primary);
  font-weight: 700;
  white-space: nowrap;
  min-width: 70px;
  text-align: center;
}

.news-title {
  font-size: 15px;
  color: var(--color-text);
}

.news-more {
  text-align: center;
}

/* --------------------------------------------------------------------------
   お問い合わせCTAセクション
   -------------------------------------------------------------------------- */
.cta-section {
  background: var(--color-primary);
  color: #fff;
  padding: 80px 0;
  text-align: center;
}

.cta-section h2 {
  font-size: clamp(22px, 3vw, 32px);
  font-weight: 700;
  margin-bottom: 12px;
}

.cta-section p {
  color: rgba(255,255,255,0.8);
  margin-bottom: 36px;
}

.cta-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 24px;
  flex-wrap: wrap;
}

.cta-tel {
  font-family: var(--font-en);
  font-size: 22px;
  font-weight: 700;
  color: #fff;
}

.cta-tel span {
  display: block;
  font-size: 12px;
  font-family: var(--font-ja);
  font-weight: 400;
  color: rgba(255,255,255,0.7);
  letter-spacing: 0.05em;
}

/* --------------------------------------------------------------------------
   お問い合わせフォーム
   -------------------------------------------------------------------------- */
.contact-section {
  padding: 80px 0;
}

.contact-form {
  max-width: 760px;
  margin: 0 auto;
}

.form-group {
  margin-bottom: 28px;
}

.form-label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.form-required {
  font-size: 11px;
  color: #fff;
  background: #C0392B;
  padding: 2px 8px;
  border-radius: 4px;
}

.form-optional {
  font-size: 11px;
  color: var(--color-text-sub);
  background: var(--color-bg-sub);
  padding: 2px 8px;
  border-radius: 4px;
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: 12px 16px;
  border: 2px solid #DDE2E6;
  border-radius: var(--radius);
  font-family: var(--font-ja);
  font-size: 15px;
  color: var(--color-text);
  background: #fff;
  transition: border-color var(--transition);
  outline: none;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  border-color: var(--color-primary);
}

.form-textarea {
  resize: vertical;
  min-height: 160px;
}

.form-file-note {
  font-size: 12px;
  color: var(--color-text-sub);
  margin-top: 6px;
}

.form-checkbox {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 14px;
}

.form-checkbox input {
  width: 18px;
  height: 18px;
  margin-top: 2px;
  accent-color: var(--color-primary);
  flex-shrink: 0;
}

.form-submit {
  text-align: center;
  margin-top: 40px;
}

.form-submit .btn {
  min-width: 240px;
  font-size: 16px;
  padding: 16px 40px;
}

/* --------------------------------------------------------------------------
   FAQアコーディオン
   -------------------------------------------------------------------------- */
.faq-section {
  padding: 80px 0;
}

.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  border-bottom: 1px solid #DDE2E6;
}

.faq-question {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 24px 0;
  cursor: pointer;
  font-size: 16px;
  font-weight: 700;
  color: var(--color-primary);
  user-select: none;
  transition: color var(--transition);
}

.faq-question:hover {
  color: var(--color-accent);
}

.faq-q-label {
  font-family: var(--font-en);
  font-size: 22px;
  font-weight: 700;
  color: var(--color-accent);
  line-height: 1;
  flex-shrink: 0;
}

.faq-question-text {
  flex: 1;
  padding-top: 3px;
}

.faq-toggle {
  font-size: 20px;
  line-height: 1;
  transition: transform 0.3s ease;
  flex-shrink: 0;
  padding-top: 2px;
}

.faq-item.is-open .faq-toggle {
  transform: rotate(45deg);
}

.faq-answer {
  display: none;
  padding: 0 0 24px 38px;
  font-size: 15px;
  color: var(--color-text);
  line-height: 1.8;
}

.faq-answer-inner {
  display: flex;
  gap: 16px;
}

.faq-a-label {
  font-family: var(--font-en);
  font-size: 22px;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1;
  flex-shrink: 0;
}

/* --------------------------------------------------------------------------
   ページヘッダー（下層ページ共通）
   -------------------------------------------------------------------------- */
.page-header {
  background: var(--color-primary);
  color: #fff;
  padding: 60px 0;
  text-align: center;
}

.page-header-label {
  font-family: var(--font-en);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 8px;
}

.page-header h1 {
  font-size: clamp(26px, 3.5vw, 40px);
  font-weight: 700;
  letter-spacing: 0.06em;
}

/* パンくず */
.breadcrumb {
  background: var(--color-bg-sub);
  padding: 12px 0;
}

.breadcrumb ol {
  display: flex;
  gap: 8px;
  align-items: center;
  font-size: 13px;
  color: var(--color-text-sub);
}

.breadcrumb li + li::before {
  content: '›';
  margin-right: 8px;
}

.breadcrumb a {
  color: var(--color-primary);
}

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

/* --------------------------------------------------------------------------
   プレースホルダーコンテンツ（準備中ページ）
   -------------------------------------------------------------------------- */
.placeholder-section {
  padding: 80px 0;
  text-align: center;
}

.placeholder-icon {
  font-size: 72px;
  margin-bottom: 24px;
}

.placeholder-section h2 {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 12px;
}

.placeholder-section p {
  color: var(--color-text-sub);
  margin-bottom: 32px;
}

/* --------------------------------------------------------------------------
   レスポンシブ（768px）
   -------------------------------------------------------------------------- */
@media (max-width: 768px) {
  .section {
    padding: 56px 0;
  }

  /* ヘッダー */
  .header-nav,
  .header-tel {
    display: none;
  }

  .hamburger {
    display: flex;
  }

  /* ヒーロー */
  .hero-btns {
    flex-direction: column;
    align-items: center;
  }

  /* 強み */
  .strengths-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  /* 加工分野 */
  .fields-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  /* 製作実績 */
  .works-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  /* 保有設備 */
  .facility-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  /* フッター */
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  /* CTA */
  .cta-actions {
    flex-direction: column;
    gap: 16px;
  }
}

/* --------------------------------------------------------------------------
   レスポンシブ（480px）
   -------------------------------------------------------------------------- */
@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }

  /* 強み */
  .strengths-grid {
    grid-template-columns: 1fr;
  }

  /* 加工分野 */
  .fields-grid {
    grid-template-columns: 1fr;
  }

  /* 製作実績 */
  .works-grid {
    grid-template-columns: 1fr;
  }

  /* 保有設備 */
  .facility-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  /* ニュース */
  .news-item {
    flex-direction: column;
    gap: 8px;
  }
}