/*
Theme Name:  NK Child – BtoB Service
Theme URI:   https://nk-technical.co.jp/themes/nk-child-b2b-service
Description: BtoB向け法人サービス業テーマ。信頼感・実績・課題解決訴求に特化。
Author:      NK Technical Support Inc.
Author URI:  https://nk-technical.co.jp
Template:    nk-base-theme
Version:     1.5.0
License:     GNU General Public License v2 or later
License URI: https://www.gnu.org/licenses/gpl-2.0.html
Text Domain: nk-child-b2b-service
Tags:        b2b, service, corporate, business, professional
*/

/* ============================================================
   BtoB Service – ブランドカラー変数オーバーライド
   Primary: ネイビーブルー（信頼・格式）
   Accent:  テールグリーン（成長・IT）
   ============================================================ */
:root {
  --nk-color-primary:        #0D2E5A;   /* ディープネイビー */
  --nk-color-primary-light:  #1A4A8A;
  --nk-color-primary-dark:   #081C3A;
  --nk-color-accent:         #00896A;   /* テールグリーン */
  --nk-color-accent-light:   #00B88A;
  --nk-color-accent-dark:    #006B52;
  --nk-color-bg:             #F7F9FC;
  --nk-color-bg-alt:         #EEF2F8;
  --nk-color-text:           #1A1E2D;
  --nk-color-text-muted:     #5A6478;
  --nk-color-border:         #D0D8E8;
  --nk-color-white:          #FFFFFF;
  --nk-font-base:            'Noto Sans JP', 'Hiragino Sans', sans-serif;
  --nk-font-heading:         'Noto Sans JP', 'Hiragino Sans', sans-serif;
  --nk-font-weight-heading:  700;
  --nk-radius:               6px;
  --nk-shadow:               0 2px 16px rgba(13,46,90,.10);
  --nk-shadow-hover:         0 6px 32px rgba(13,46,90,.18);
}

/* ============================================================
   ヘッダー – ロゴ左・ナビ右 / ネイビー背景
   ============================================================ */
.site-header {
  background: var(--nk-color-primary);
  border-bottom: 3px solid var(--nk-color-accent);
  box-shadow: 0 2px 8px rgba(0,0,0,.25);
}
.site-header .site-title a,
.site-header .nav-menu a {
  color: var(--nk-color-white);
}
.site-header .nav-menu a:hover {
  color: var(--nk-color-accent-light);
}
.site-header .btn-contact {
  background: var(--nk-color-accent);
  color: var(--nk-color-white);
  border-radius: var(--nk-radius);
  padding: .5rem 1.2rem;
  font-weight: 700;
  transition: background .2s;
}
.site-header .btn-contact:hover { background: var(--nk-color-accent-dark); }

/* ============================================================
   ヒーロー – フルスクリーン + パーティクル風オーバーレイ
   ============================================================ */
.hero-section {
  position: relative;
  min-height: 580px;
  background: linear-gradient(135deg, #0D2E5A 0%, #1A4A8A 50%, #00896A 100%);
  display: flex;
  align-items: center;
  overflow: hidden;
}
.hero-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.04'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}
.hero-section .hero-content {
  position: relative;
  z-index: 1;
  max-width: 700px;
}
.hero-section .hero-eyebrow {
  display: inline-block;
  background: rgba(0,137,106,.8);
  color: #fff;
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .12em;
  padding: .35rem 1rem;
  border-radius: 2px;
  margin-bottom: 1.2rem;
  text-transform: uppercase;
}
.hero-section .hero-title {
  font-size: clamp(1.8rem, 4vw, 3rem);
  font-weight: 900;
  color: var(--nk-color-white);
  line-height: 1.3;
  margin-bottom: 1rem;
}
.hero-section .hero-lead {
  font-size: 1.05rem;
  color: rgba(255,255,255,.88);
  line-height: 1.9;
  margin-bottom: 2rem;
}
.hero-section .hero-cta-group { display: flex; gap: 1rem; flex-wrap: wrap; }
.hero-section .btn-primary-hero {
  background: var(--nk-color-accent);
  color: #fff;
  padding: .9rem 2.2rem;
  border-radius: var(--nk-radius);
  font-weight: 700;
  font-size: 1rem;
  transition: transform .2s, box-shadow .2s;
  box-shadow: 0 4px 18px rgba(0,137,106,.4);
}
.hero-section .btn-primary-hero:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(0,137,106,.5);
}
.hero-section .btn-secondary-hero {
  background: transparent;
  border: 2px solid rgba(255,255,255,.6);
  color: #fff;
  padding: .9rem 2.2rem;
  border-radius: var(--nk-radius);
  font-weight: 600;
  font-size: 1rem;
  transition: border-color .2s, background .2s;
}
.hero-section .btn-secondary-hero:hover {
  border-color: #fff;
  background: rgba(255,255,255,.1);
}

/* ============================================================
   カスタマイザー対応：セクション共通スタイル
   ============================================================ */
.nk-section-header { text-align: center; margin-bottom: 3rem; }
.nk-section-header__eyebrow {
    display: inline-block;
    font-size: .75rem;
    font-weight: 700;
    letter-spacing: .18em;
    text-transform: uppercase;
    color: var(--nk-color-accent);
    border-bottom: 2px solid var(--nk-color-accent);
    padding-bottom: .25rem;
    margin-bottom: .75rem;
}
.nk-section-header__title {
    font-size: clamp(1.4rem, 3vw, 2rem);
    font-weight: 700;
    color: var(--nk-color-primary);
    margin: 0 0 .75rem;
}
.nk-section-header__lead {
    font-size: .95rem;
    color: var(--nk-color-text-muted);
    line-height: 1.8;
    margin: 0;
}
.nk-section-more { text-align: center; margin-top: 2.5rem; }
.nk-section-more--right { text-align: right; margin-top: 1rem; }
/* ニュース行 */
.nk-news-list { border-top: 1px solid var(--nk-color-border); }
.nk-news-row {
    display: flex;
    gap: 1.2rem;
    padding: .9rem 0;
    border-bottom: 1px solid var(--nk-color-border);
}
.nk-news-row__date { color: var(--nk-color-text-muted); font-size: .85rem; white-space: nowrap; }
.nk-news-row__title { font-size: .92rem; }
.nk-news-empty { color: var(--nk-color-text-muted); }

/* ============================================================
   課題・ソリューション セクション
   ============================================================ */
.problem-section { background: var(--nk-color-bg-alt); }
.problem-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
}
.problem-card {
  background: #fff;
  border: 2px solid var(--nk-color-border);
  border-radius: var(--nk-radius);
  padding: 1.8rem;
  position: relative;
  transition: border-color .2s, box-shadow .2s;
}
.problem-card:hover {
  border-color: var(--nk-color-primary-light);
  box-shadow: var(--nk-shadow);
}
.problem-card .problem-icon {
  width: 48px; height: 48px;
  background: var(--nk-color-bg-alt);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.4rem;
  margin-bottom: 1rem;
}
.problem-card .problem-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--nk-color-primary);
  margin-bottom: .5rem;
}
.problem-card .problem-text { font-size: .9rem; color: var(--nk-color-text-muted); line-height: 1.7; }

/* ============================================================
   強み・特徴 セクション（3カラムアイコン）
   ============================================================ */
.strength-section { background: var(--nk-color-white); }
.strength-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 2rem;
  text-align: center;
}
.strength-item .strength-icon {
  width: 72px; height: 72px;
  background: linear-gradient(135deg, var(--nk-color-primary) 0%, var(--nk-color-primary-light) 100%);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  margin: 0 auto 1.2rem;
  font-size: 1.8rem;
  color: #fff;
  box-shadow: 0 4px 16px rgba(13,46,90,.3);
}
.strength-item .strength-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--nk-color-primary);
  margin-bottom: .5rem;
}
.strength-item .strength-text { font-size: .88rem; color: var(--nk-color-text-muted); line-height: 1.7; }

/* ============================================================
   実績数値バナー
   ============================================================ */
.stats-bar {
  background: linear-gradient(90deg, var(--nk-color-primary) 0%, var(--nk-color-primary-light) 100%);
  padding: 3rem 0;
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 1.5rem;
  text-align: center;
}
.stat-item .stat-number {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 900;
  color: var(--nk-color-white);
  line-height: 1;
}
.stat-item .stat-number span { font-size: .6em; font-weight: 400; }
.stat-item .stat-label {
  font-size: .85rem;
  color: rgba(255,255,255,.78);
  margin-top: .4rem;
}

/* ============================================================
   サービス一覧カード
   ============================================================ */
.service-card {
  background: var(--nk-color-white);
  border-radius: var(--nk-radius);
  overflow: hidden;
  box-shadow: var(--nk-shadow);
  transition: transform .25s, box-shadow .25s;
}
.service-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--nk-shadow-hover);
}
.service-card .service-card-header {
  background: linear-gradient(135deg, var(--nk-color-primary), var(--nk-color-primary-light));
  padding: 1.5rem;
  display: flex;
  align-items: center;
  gap: 1rem;
}
.service-card .service-card-header .service-icon {
  width: 48px; height: 48px;
  background: rgba(255,255,255,.15);
  border-radius: var(--nk-radius);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.4rem;
  color: #fff;
}
.service-card .service-card-header .service-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: #fff;
  margin: 0;
}
.service-card .service-card-body { padding: 1.5rem; }
.service-card .service-card-body p { font-size: .9rem; color: var(--nk-color-text-muted); line-height: 1.7; margin-bottom: 1rem; }
.service-card .service-card-body .btn-detail {
  color: var(--nk-color-accent);
  font-weight: 700;
  font-size: .88rem;
  display: inline-flex;
  align-items: center;
  gap: .3rem;
}
.service-card .service-card-body .btn-detail::after { content: '→'; }

/* ============================================================
   導入事例カード
   ============================================================ */
.case-card {
  background: var(--nk-color-white);
  border-radius: var(--nk-radius);
  box-shadow: var(--nk-shadow);
  overflow: hidden;
  transition: box-shadow .25s;
}
.case-card:hover { box-shadow: var(--nk-shadow-hover); }
.case-card .case-industry-badge {
  display: inline-block;
  background: var(--nk-color-bg-alt);
  color: var(--nk-color-primary);
  font-size: .75rem;
  font-weight: 700;
  padding: .3rem .8rem;
  border-radius: 2px;
  margin-bottom: .8rem;
}
.case-card .case-client { font-size: .9rem; color: var(--nk-color-text-muted); margin-bottom: .5rem; }
.case-card .case-title { font-size: 1.05rem; font-weight: 700; color: var(--nk-color-primary); margin-bottom: .8rem; }
.case-card .case-result {
  background: linear-gradient(135deg, rgba(0,137,106,.08), rgba(0,137,106,.15));
  border-left: 3px solid var(--nk-color-accent);
  padding: .8rem 1rem;
  font-size: .88rem;
  color: var(--nk-color-accent-dark);
  font-weight: 600;
  border-radius: 0 var(--nk-radius) var(--nk-radius) 0;
}

/* ============================================================
   CTA セクション
   ============================================================ */
.cta-section {
  background: linear-gradient(135deg, var(--nk-color-primary-dark) 0%, var(--nk-color-primary) 100%);
  padding: 5rem 0;
  text-align: center;
}
.cta-section .cta-title {
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  font-weight: 800;
  color: #fff;
  margin-bottom: 1rem;
}
.cta-section .cta-lead { color: rgba(255,255,255,.8); font-size: 1rem; margin-bottom: 2rem; line-height: 1.8; }
.cta-section .cta-btn-group { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; }
.cta-section .btn-cta-primary {
  background: var(--nk-color-accent);
  color: #fff;
  padding: 1rem 2.5rem;
  border-radius: var(--nk-radius);
  font-weight: 700;
  font-size: 1.05rem;
  box-shadow: 0 4px 20px rgba(0,137,106,.45);
  transition: transform .2s, box-shadow .2s;
}
.cta-section .btn-cta-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 30px rgba(0,137,106,.55); }
.cta-section .btn-cta-secondary {
  background: transparent;
  border: 2px solid rgba(255,255,255,.55);
  color: #fff;
  padding: 1rem 2.5rem;
  border-radius: var(--nk-radius);
  font-weight: 600;
  font-size: 1.05rem;
  transition: border-color .2s, background .2s;
}
.cta-section .btn-cta-secondary:hover { border-color: #fff; background: rgba(255,255,255,.08); }

/* ============================================================
   フッター
   ============================================================ */
.site-footer {
  background: var(--nk-color-primary-dark);
  color: rgba(255,255,255,.75);
  font-size: .85rem;
}
.site-footer a { color: rgba(255,255,255,.6); }
.site-footer a:hover { color: #fff; }
.site-footer .footer-logo { color: #fff; font-size: 1.2rem; font-weight: 700; }
.footer-divider { border-color: rgba(255,255,255,.12); }

/* ============================================================
   レスポンシブ補正
   ============================================================ */
@media (max-width: 768px) {
  .hero-section { min-height: 420px; }
  .hero-section .hero-cta-group { flex-direction: column; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .problem-grid,
  .strength-grid { grid-template-columns: 1fr; }
}