/* ==========================================================================
   熊本AI研究所 (KUMAMOTO AI LABORATORY) - 公式スタイルシート
   ファイル名: kai_lab_styles.css
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. デザインシステム & CSS変数
   -------------------------------------------------------------------------- */
:root {
  /* カラーパレット */
  --kai-color-bg-dark: #0B132B;
  --kai-color-bg-navy: #1C2541;
  --kai-color-bg-card: #162447;
  --kai-color-bg-light: #F4F6F9;
  
  --kai-color-cyan-bright: #48CAE4;
  --kai-color-cyan-main: #00B4D8;
  --kai-color-gold-accent: #D4AF37;
  --kai-color-gold-light: #F3E5AB;
  
  --kai-color-text-main: #FFFFFF;
  --kai-color-text-sub: #C0C8D6;
  --kai-color-text-dark: #1F2937;
  --kai-color-text-muted: #6B7280;

  --kai-color-border: rgba(72, 202, 228, 0.2);
  --kai-color-border-gold: rgba(212, 175, 55, 0.3);

  /* ステータスカラー */
  --kai-status-research: #93C5FD;
  --kai-status-active: #34D399;
  --kai-status-implemented: #FBBF24;
  --kai-status-archive: #9CA3AF;

  /* フォント（OS標準・標準Webセーフフォント指定） */
  --kai-font-serif: "Hiragino Mincho ProN", "Yu Mincho", "Shippori Mincho", "MS PMincho", serif;
  --kai-font-sans: "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Yu Gothic UI", "Meiryo", sans-serif;
  --kai-font-mono: SFMono-Regular, Consolas, "Liberation Mono", Menlo, monospace;

  /* トランジション */
  --kai-transition-fast: 0.2s ease;
  --kai-transition-normal: 0.3s ease;
  
  /* コンテナ幅 */
  --kai-container-max: 1200px;
}

/* --------------------------------------------------------------------------
   2. リセット & 基本設定
   -------------------------------------------------------------------------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  background-color: var(--kai-color-bg-dark);
  color: var(--kai-color-text-main);
  font-family: var(--kai-font-sans);
  line-height: 1.7;
}

body {
  overflow-x: hidden;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a {
  color: var(--kai-color-cyan-bright);
  text-decoration: none;
  transition: color var(--kai-transition-fast);
}

a:hover {
  color: var(--kai-color-gold-accent);
}

a:focus-visible,
button:focus-visible {
  outline: 3px solid var(--kai-color-gold-accent);
  outline-offset: 3px;
}

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

.kai-container {
  width: 90%;
  max-width: var(--kai-container-max);
  margin: 0 auto;
}

/* --------------------------------------------------------------------------
   3. ヘッダー & ナビゲーション
   -------------------------------------------------------------------------- */
.kai-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(11, 19, 43, 0.9);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--kai-color-border);
  transition: background var(--kai-transition-normal);
}

.kai-nav-wrapper {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 80px;
}

.kai-logo {
  display: flex;
  flex-direction: column;
}

.kai-logo-main {
  font-family: var(--kai-font-serif);
  font-size: 1.25rem;
  font-weight: 700;
  color: #FFFFFF;
  letter-spacing: 0.05em;
}

.kai-logo-sub {
  font-size: 0.68rem;
  color: var(--kai-color-cyan-bright);
  letter-spacing: 0.1em;
}

.kai-nav-list {
  display: flex;
  list-style: none;
  gap: 24px;
}

.kai-nav-link {
  color: var(--kai-color-text-sub);
  font-size: 0.95rem;
  font-weight: 500;
  padding: 6px 0;
  position: relative;
}

.kai-nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--kai-color-cyan-bright);
  transition: width var(--kai-transition-fast);
}

.kai-nav-link:hover {
  color: #FFFFFF;
}

.kai-nav-link:hover::after {
  width: 100%;
}

/* ハンバーガーボタン */
.kai-menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 10px;
  z-index: 1001;
}

.kai-hamburger-icon {
  width: 24px;
  height: 18px;
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.kai-hamburger-icon span {
  display: block;
  width: 100%;
  height: 2px;
  background-color: #FFFFFF;
  transition: transform var(--kai-transition-fast), opacity var(--kai-transition-fast);
}

/* --------------------------------------------------------------------------
   4. ヒーローセクション
   -------------------------------------------------------------------------- */
.kai-hero {
  position: relative;
  min-height: 90vh;
  display: flex;
  align-items: center;
  padding-top: 100px;
  background-image: url('kai_lab_assets/kai_lab_hero_bg.svg');
  background-size: cover;
  background-position: center;
}

.kai-hero-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(180deg, rgba(11, 19, 43, 0.4) 0%, rgba(11, 19, 43, 0.95) 100%);
}

.kai-hero-content {
  position: relative;
  z-index: 10;
  max-width: 800px;
}

.kai-hero-badge {
  display: inline-block;
  padding: 6px 16px;
  border-radius: 20px;
  background: rgba(0, 180, 216, 0.15);
  border: 1px solid var(--kai-color-cyan-bright);
  color: var(--kai-color-cyan-bright);
  font-size: 0.85rem;
  margin-bottom: 24px;
  font-weight: 600;
}

.kai-hero-title {
  font-family: var(--kai-font-serif);
  font-size: clamp(2.2rem, 5vw, 3.8rem);
  line-height: 1.3;
  margin-bottom: 24px;
  color: #FFFFFF;
  word-break: keep-all;
}

.kai-hero-desc {
  font-size: 1.1rem;
  color: var(--kai-color-text-sub);
  margin-bottom: 24px;
  line-height: 1.9;
}

.kai-hero-subcopy {
  font-family: var(--kai-font-serif);
  font-size: 1.15rem;
  color: var(--kai-color-gold-accent);
  border-left: 3px solid var(--kai-color-gold-accent);
  padding-left: 16px;
  margin-bottom: 40px;
}

.kai-hero-cta {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

/* ボタン */
.kai-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 28px;
  border-radius: 4px;
  font-weight: 600;
  font-size: 1rem;
  transition: all var(--kai-transition-fast);
  cursor: pointer;
}

.kai-btn-primary {
  background: linear-gradient(135deg, var(--kai-color-cyan-main), #0077B6);
  color: #FFFFFF;
  box-shadow: 0 4px 14px rgba(0, 180, 216, 0.4);
}

.kai-btn-primary:hover {
  background: linear-gradient(135deg, var(--kai-color-cyan-bright), var(--kai-color-cyan-main));
  color: #FFFFFF;
  transform: translateY(-2px);
}

.kai-btn-outline {
  background: transparent;
  border: 1px solid var(--kai-color-border);
  color: var(--kai-color-text-sub);
}

.kai-btn-outline:hover {
  border-color: var(--kai-color-gold-accent);
  color: var(--kai-color-gold-accent);
}

/* --------------------------------------------------------------------------
   5. 共通セクションスタイル
   -------------------------------------------------------------------------- */
.kai-section {
  padding: 90px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.kai-section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 60px;
}

.kai-section-subtitle {
  font-size: 0.85rem;
  letter-spacing: 0.2em;
  color: var(--kai-color-cyan-bright);
  text-transform: uppercase;
  margin-bottom: 8px;
  font-weight: 700;
}

.kai-section-title {
  font-family: var(--kai-font-serif);
  font-size: clamp(1.8rem, 3.5vw, 2.5rem);
  color: #FFFFFF;
  margin-bottom: 16px;
  line-height: 1.4;
}

.kai-section-desc {
  color: var(--kai-color-text-sub);
  font-size: 1rem;
}

/* --------------------------------------------------------------------------
   6. セクション：研究所について
   -------------------------------------------------------------------------- */
.kai-about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
}

.kai-about-card {
  background: var(--kai-color-bg-navy);
  border: 1px solid var(--kai-color-border);
  border-radius: 8px;
  padding: 40px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.3);
}

.kai-about-card h3 {
  font-family: var(--kai-font-serif);
  font-size: 1.5rem;
  color: var(--kai-color-gold-accent);
  margin-bottom: 20px;
}

.kai-about-card p {
  color: var(--kai-color-text-sub);
  margin-bottom: 16px;
  line-height: 1.9;
}

.kai-disclaimer-box {
  margin-top: 24px;
  padding: 16px;
  background: rgba(212, 175, 55, 0.08);
  border-left: 3px solid var(--kai-color-gold-accent);
  font-size: 0.9rem;
  color: var(--kai-color-gold-light);
}

/* --------------------------------------------------------------------------
   7. セクション：研究・実践・公開 (3つの軸)
   -------------------------------------------------------------------------- */
.kai-pillars-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
}

.kai-pillar-card {
  background: var(--kai-color-bg-navy);
  border: 1px solid var(--kai-color-border);
  border-radius: 8px;
  padding: 36px;
  transition: transform var(--kai-transition-normal), border-color var(--kai-transition-normal);
}

.kai-pillar-card:hover {
  transform: translateY(-5px);
  border-color: var(--kai-color-cyan-bright);
}

.kai-pillar-num {
  font-family: var(--kai-font-serif);
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--kai-color-cyan-main);
  margin-bottom: 12px;
}

.kai-pillar-card h3 {
  font-size: 1.3rem;
  margin-bottom: 12px;
  color: #FFFFFF;
}

.kai-pillar-card p {
  color: var(--kai-color-text-sub);
  font-size: 0.95rem;
}

/* --------------------------------------------------------------------------
   8. セクション：主要研究分野 (6分野)
   -------------------------------------------------------------------------- */
.kai-fields-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
}

.kai-field-item {
  background: rgba(28, 37, 65, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 6px;
  padding: 24px;
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.kai-field-icon {
  width: 44px;
  height: 44px;
  background: rgba(0, 180, 216, 0.15);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--kai-color-cyan-bright);
  font-size: 1.2rem;
  flex-shrink: 0;
}

.kai-field-content h4 {
  font-size: 1.1rem;
  color: #FFFFFF;
  margin-bottom: 6px;
}

.kai-field-content p {
  font-size: 0.9rem;
  color: var(--kai-color-text-sub);
}

/* --------------------------------------------------------------------------
   9. セクション：実証プロジェクト
   -------------------------------------------------------------------------- */
.kai-projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.kai-project-card {
  background: var(--kai-color-bg-navy);
  border: 1px solid var(--kai-color-border);
  border-radius: 8px;
  padding: 24px;
  display: flex;
  flex-direction: column;
}

.kai-project-badge {
  align-self: flex-start;
  font-size: 0.75rem;
  padding: 3px 10px;
  border-radius: 12px;
  font-weight: 600;
  margin-bottom: 14px;
}

.badge-research { background: rgba(147, 197, 253, 0.2); color: var(--kai-status-research); }
.badge-active { background: rgba(52, 211, 153, 0.2); color: var(--kai-status-active); }
.badge-implemented { background: rgba(251, 191, 36, 0.2); color: var(--kai-status-implemented); }
.badge-archive { background: rgba(156, 163, 175, 0.2); color: var(--kai-status-archive); }

.kai-project-card h4 {
  font-size: 1.05rem;
  color: #FFFFFF;
  margin-bottom: 10px;
  line-height: 1.5;
}

.kai-project-card p {
  font-size: 0.88rem;
  color: var(--kai-color-text-sub);
}

/* --------------------------------------------------------------------------
   10. セクション：note研究記事
   -------------------------------------------------------------------------- */
.kai-articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 28px;
}

.kai-article-card {
  background: var(--kai-color-bg-navy);
  border: 1px solid var(--kai-color-border);
  border-radius: 8px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform var(--kai-transition-normal);
}

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

.kai-article-thumb {
  width: 100%;
  height: 180px;
  object-fit: cover;
  background-color: var(--kai-color-bg-dark);
}

.kai-article-body {
  padding: 20px;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.kai-article-meta {
  display: flex;
  justify-content: space-between;
  font-size: 0.78rem;
  color: var(--kai-color-cyan-bright);
  margin-bottom: 8px;
}

.kai-article-title {
  font-size: 1.05rem;
  color: #FFFFFF;
  margin-bottom: 10px;
  line-height: 1.5;
}

.kai-article-summary {
  font-size: 0.88rem;
  color: var(--kai-color-text-sub);
  margin-bottom: 16px;
  flex-grow: 1;
}

.kai-article-tags {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}

.kai-tag {
  font-size: 0.72rem;
  background: rgba(255, 255, 255, 0.06);
  padding: 2px 8px;
  border-radius: 4px;
  color: var(--kai-color-text-sub);
}

.kai-article-link {
  font-size: 0.88rem;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--kai-color-gold-accent);
}

/* JS無効フォールバック */
.kai-no-js-notice {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--kai-color-border);
  padding: 20px;
  border-radius: 6px;
  text-align: center;
  margin-top: 20px;
}

/* --------------------------------------------------------------------------
   11. セクション：西原村AIアカデミア & 関連プロジェクト
   -------------------------------------------------------------------------- */
.kai-rel-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 30px;
}

.kai-rel-card {
  background: var(--kai-color-bg-navy);
  border: 1px solid var(--kai-color-border);
  border-radius: 8px;
  padding: 32px;
  display: flex;
  flex-direction: column;
}

.kai-rel-card h3 {
  font-family: var(--kai-font-serif);
  font-size: 1.4rem;
  color: #FFFFFF;
  margin-bottom: 8px;
}

.kai-rel-tagline {
  font-size: 0.85rem;
  color: var(--kai-color-cyan-bright);
  margin-bottom: 16px;
  font-weight: 600;
}

.kai-rel-card p {
  font-size: 0.92rem;
  color: var(--kai-color-text-sub);
  margin-bottom: 20px;
  line-height: 1.8;
  flex-grow: 1;
}

.kai-notice-rel {
  font-size: 0.85rem;
  padding: 10px 14px;
  background: rgba(72, 202, 228, 0.08);
  border-left: 2px solid var(--kai-color-cyan-bright);
  margin-bottom: 20px;
  color: var(--kai-color-text-sub);
}

/* --------------------------------------------------------------------------
   12. セクション：AIによる研究所運営 (役割分担表)
   -------------------------------------------------------------------------- */
.kai-table-wrapper {
  overflow-x: auto;
  background: var(--kai-color-bg-navy);
  border: 1px solid var(--kai-color-border);
  border-radius: 8px;
}

.kai-ops-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  min-width: 600px;
}

.kai-ops-table th,
.kai-ops-table td {
  padding: 16px 24px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.kai-ops-table th {
  background: rgba(11, 19, 43, 0.8);
  color: var(--kai-color-cyan-bright);
  font-weight: 600;
  font-size: 0.95rem;
}

.kai-ops-table td {
  font-size: 0.9rem;
  color: var(--kai-color-text-sub);
}

.kai-ops-table tr:last-child td {
  border-bottom: none;
}

.kai-ops-table td:first-child {
  font-weight: 700;
  color: #FFFFFF;
  width: 25%;
}

.kai-human-row {
  background: rgba(212, 175, 55, 0.08);
}

.kai-human-row td:first-child {
  color: var(--kai-color-gold-accent);
}

/* --------------------------------------------------------------------------
   13. フッター & 共通ナビゲーション
   -------------------------------------------------------------------------- */
.kai-footer {
  background: #060B18;
  padding: 60px 0 30px;
  border-top: 1px solid var(--kai-color-border);
  margin-top: auto;
}

.kai-footer-top {
  display: flex;
  justify-content: space-between;
  gap: 40px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}

.kai-footer-info h4 {
  font-family: var(--kai-font-serif);
  font-size: 1.2rem;
  color: #FFFFFF;
  margin-bottom: 8px;
}

.kai-footer-info p {
  font-size: 0.85rem;
  color: var(--kai-color-text-sub);
}

.kai-footer-nav {
  display: flex;
  gap: 30px;
  flex-wrap: wrap;
}

.kai-footer-nav-col h5 {
  font-size: 0.85rem;
  color: var(--kai-color-cyan-bright);
  margin-bottom: 12px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.kai-footer-nav-col ul {
  list-style: none;
}

.kai-footer-nav-col li {
  margin-bottom: 8px;
}

.kai-footer-nav-col a {
  font-size: 0.88rem;
  color: var(--kai-color-text-sub);
}

.kai-footer-bottom {
  text-align: center;
  padding-top: 30px;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  font-size: 0.8rem;
  color: var(--kai-color-text-muted);
}

/* --------------------------------------------------------------------------
   14. レスポンシブ対応 (Media Queries)
   -------------------------------------------------------------------------- */
@media (max-width: 992px) {
  .kai-about-grid,
  .kai-rel-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .kai-menu-toggle {
    display: block;
  }

  .kai-nav-list {
    position: fixed;
    top: 80px;
    right: -100%;
    width: 80%;
    max-width: 300px;
    height: calc(100vh - 80px);
    background: var(--kai-color-bg-navy);
    flex-direction: column;
    padding: 30px;
    gap: 20px;
    transition: right var(--kai-transition-normal);
    border-left: 1px solid var(--kai-color-border);
    box-shadow: -10px 0 20px rgba(0,0,0,0.5);
  }

  .kai-nav-list.is-active {
    right: 0;
  }

  /* ハンバーガーのアニメーション */
  .kai-menu-toggle.is-active .kai-hamburger-icon span:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
  }
  .kai-menu-toggle.is-active .kai-hamburger-icon span:nth-child(2) {
    opacity: 0;
  }
  .kai-menu-toggle.is-active .kai-hamburger-icon span:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
  }

  .kai-hero {
    min-height: 80vh;
    padding-top: 120px;
  }

  .kai-section {
    padding: 60px 0;
  }
}

/* --------------------------------------------------------------------------
   15. prefers-reduced-motion 対応
   -------------------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}