/* ========================================
   リセット & ベース設定
======================================== */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  height: 100%;
}

body {
  font-family: 'Montserrat', 'Noto Sans JP', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', sans-serif;
  background: linear-gradient(135deg, #fdfcfb 0%, #f8f9fa 50%, #faf9f8 100%);
  color: #2d3748;
  line-height: 1.7;
  overflow-x: hidden;
  min-height: 100%;
  font-size: 16px;
  display: flex;
  font-weight: 400;
}

a {
  color: #00CED1;
  text-decoration: none;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
}

a:hover {
  color: #20B2AA;
}

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

strong {
  font-weight: 600;
}

/* ページロードアニメーション */
@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

body {
  animation: fadeIn 0.6s ease-in;
}

/* ========================================
   サイドバー
======================================== */
.sidebar {
  position: fixed;
  left: 0;
  top: 0;
  bottom: 0;
  width: 280px;
  padding: 3rem 2rem;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  box-shadow: 2px 0 30px rgba(127, 255, 212, 0.08);
  overflow-y: auto;
  z-index: 100;
}

.sidebar-header {
  margin-bottom: 3rem;
}

.profile-image-wrapper {
  margin-bottom: 1.5rem;
  display: flex;
  justify-content: center;
}

.profile-image-link {
  display: inline-block;
  text-decoration: none;
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.profile-image-link:hover {
  transform: translateY(-4px);
}

.profile-image {
  width: 140px;
  height: 140px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid rgba(127, 255, 212, 0.3);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 0 4px 12px rgba(127, 255, 212, 0.2);
}

.profile-image-link:hover .profile-image {
  border-color: rgba(127, 255, 212, 0.5);
  box-shadow: 0 8px 24px rgba(127, 255, 212, 0.35);
}

.sidebar-title-link {
  text-decoration: none;
  display: inline-block;
  position: relative;
}

.sidebar-title {
  font-size: 2.25rem;
  font-weight: 300;
  margin-bottom: 1rem;
  letter-spacing: 0.05em;
  line-height: 1.3;
  transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  cursor: pointer;
  font-family: 'Playfair Display', 'Noto Sans JP', serif;
  position: relative;
  display: inline-block;
}

.name-first {
  font-weight: 300;
  background: linear-gradient(135deg, #7FFFD4 0%, #00CED1 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  display: inline-block;
  transition: all 0.3s ease;
  letter-spacing: 0.08em;
}

.name-second {
  font-weight: 700;
  color: #1a202c;
  display: inline-block;
  transition: all 0.3s ease;
  letter-spacing: 0.02em;
}

/* 下線を全体に適用 */
.sidebar-title::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, #7FFFD4 0%, #00CED1 100%);
  transition: width 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.sidebar-title-link:hover .sidebar-title {
  transform: translateY(-2px);
}

.sidebar-title-link:hover .name-first {
  filter: brightness(1.15);
}

.sidebar-title-link:hover .name-second {
  color: #00CED1;
}

.sidebar-title-link:hover .sidebar-title::after {
  width: 100%;
}

.sidebar-subtitle {
  font-size: 0.8rem;
  color: #718096;
  line-height: 2;
  font-family: 'Montserrat', 'Noto Sans JP', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica', sans-serif;
  font-weight: 400;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.subtitle-line {
  display: block;
  position: relative;
  padding-left: 1rem;
  transition: all 0.3s ease;
}

.subtitle-line::before {
  content: '—';
  position: absolute;
  left: 0;
  color: rgba(127, 255, 212, 0.5);
  font-weight: 300;
  transition: all 0.3s ease;
}

.subtitle-line:hover {
  color: #4a5568;
  padding-left: 1.5rem;
}

.subtitle-line:hover::before {
  color: #00CED1;
  transform: translateX(5px);
}

/* サブタイトル内のリンクスタイル */
.subtitle-line a {
  color: inherit;
  text-decoration: none;
  transition: color 0.3s ease;
}

.subtitle-line a:hover {
  color: #00CED1;
  text-decoration: underline;
  text-decoration-color: rgba(127, 255, 212, 0.5);
  text-underline-offset: 2px;
}

.subtitle-accent {
  display: block;
  font-weight: 600;
  color: #00CED1;
  margin-top: 0.5rem;
  font-size: 0.7rem;
  letter-spacing: 0.15em;
  position: relative;
  padding-left: 1rem;
}

.subtitle-accent::before {
  content: '✦';
  position: absolute;
  left: 0;
  color: #7FFFD4;
  font-size: 0.8rem;
}

.sidebar-nav ul {
  list-style: none;
}

.sidebar-nav li {
  margin-bottom: 0.5rem;
}

.sidebar-nav a {
  color: #4a5568;
  font-size: 0.95rem;
  display: block;
  padding: 0.75rem 1rem;
  margin: 0.25rem 0;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica', sans-serif;
  text-decoration: none;
  border-radius: 8px;
  position: relative;
  overflow: hidden;
}

.sidebar-nav a::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  height: 100%;
  width: 3px;
  background: linear-gradient(135deg, #7FFFD4 0%, #00CED1 100%);
  transform: scaleY(0);
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.sidebar-nav a:hover {
  color: #00CED1;
  background: rgba(127, 255, 212, 0.08);
  transform: translateX(4px);
  text-decoration: none;
}

.sidebar-nav a:hover::before {
  transform: scaleY(1);
}

.sidebar-nav a.active {
  color: #00CED1;
  background: rgba(127, 255, 212, 0.12);
  font-weight: 600;
}

.sidebar-nav a.active::before {
  transform: scaleY(1);
}

/* ========================================
   日付表示（右上）- シンプル軽量デザイン
======================================== */
.current-date {
  position: fixed;
  top: 2rem;
  right: 2rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 1rem;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(127, 255, 212, 0.25);
  border-radius: 20px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
  z-index: 1000;
  font-family: 'Montserrat', 'Noto Sans JP', sans-serif;
  font-size: 0.85rem;
  color: #4a5568;
}

.date-year {
  font-weight: 600;
  letter-spacing: 0.02em;
}

.date-separator {
  color: rgba(127, 255, 212, 0.6);
  margin: 0 -0.1rem;
}

.date-month-day {
  font-weight: 600;
  letter-spacing: 0.01em;
}

.date-weekday {
  font-family: 'Noto Sans JP', sans-serif;
  font-size: 0.8rem;
  font-weight: 500;
  color: #00CED1;
  margin-left: 0.2rem;
  padding-left: 0.5rem;
  border-left: 1px solid rgba(127, 255, 212, 0.3);
}

/* ========================================
   ダークモード切り替えボタン
======================================== */
.dark-mode-toggle {
  position: fixed;
  top: 2rem;
  right: 12rem;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(127, 255, 212, 0.2);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
  z-index: 1000;
}

.dark-mode-toggle:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(127, 255, 212, 0.15);
  border-color: rgba(127, 255, 212, 0.4);
  background: rgba(255, 255, 255, 0.95);
}

.dark-mode-toggle:active {
  transform: translateY(0);
}

.toggle-icon {
  width: 20px;
  height: 20px;
  transition: all 0.3s ease;
}

.toggle-icon svg {
  width: 100%;
  height: 100%;
  transition: all 0.3s ease;
}

.moon-icon {
  stroke: none;
  fill: #4a5568;
}

.sun-icon {
  stroke: #4a5568;
  fill: none;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.sun-icon circle {
  fill: #4a5568;
}

/* ========================================
   メインコンテンツ
======================================== */
.main-content {
  margin-left: 280px;
  padding: 4rem 4rem 4rem;
  max-width: calc(800px + 280px);
  min-height: 100vh;
}

section {
  margin-bottom: 5rem;
  padding-bottom: 2rem;
  opacity: 0;
  transform: translateY(30px);
  animation: fadeInUp 0.8s ease forwards;
  scroll-margin-top: 2rem;
}

@keyframes fadeInUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

section:nth-child(1) { animation-delay: 0.1s; }
section:nth-child(2) { animation-delay: 0.2s; }
section:nth-child(3) { animation-delay: 0.3s; }
section:nth-child(4) { animation-delay: 0.4s; }
section:nth-child(5) { animation-delay: 0.5s; }
section:nth-child(6) { animation-delay: 0.6s; }
section:nth-child(7) { animation-delay: 0.7s; }
section:nth-child(8) { animation-delay: 0.8s; }

/* ========================================
   セクションタイトル
======================================== */
.section-title {
  font-size: 3rem;
  font-weight: 400;
  color: #1a202c;
  margin-bottom: 3rem;
  letter-spacing: 0.02em;
  position: relative;
  display: inline-block;
  font-family: 'Playfair Display', 'Noto Sans JP', serif;
}

.title-text {
  position: relative;
  display: inline-block;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.title-text::before {
  content: attr(data-text);
  position: absolute;
  left: -2px;
  top: -2px;
  color: rgba(127, 255, 212, 0.3);
  z-index: -1;
  transition: all 0.4s ease;
}

.title-text::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -12px;
  width: 80px;
  height: 3px;
  background: linear-gradient(135deg, #7FFFD4 0%, #00CED1 100%);
  border-radius: 2px;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.section-title:hover .title-text {
  transform: translateY(-3px);
  color: #00CED1;
}

.section-title:hover .title-text::before {
  transform: translate(3px, 3px);
  color: rgba(127, 255, 212, 0.5);
}

.section-title:hover .title-text::after {
  width: 100%;
  height: 4px;
}

/* ========================================
   自己紹介セクション
======================================== */
#about p {
  margin-bottom: 1.5rem;
  font-size: 1.05rem;
  line-height: 1.9;
}

.intro-text {
  font-size: 1.15rem;
  line-height: 2;
  position: relative;
  padding-left: 1.5rem;
  border-left: 3px solid rgba(127, 255, 212, 0.4);
  margin-bottom: 2rem !important;
}

.intro-text::before {
  content: '"';
  position: absolute;
  left: -0.3rem;
  top: -0.5rem;
  font-size: 3rem;
  font-family: 'Playfair Display', serif;
  color: rgba(127, 255, 212, 0.3);
  line-height: 1;
}

.name-highlight {
  font-weight: 600;
  color: #00CED1;
  position: relative;
  display: inline-block;
  padding: 0 0.3rem;
  background: linear-gradient(180deg, transparent 60%, rgba(127, 255, 212, 0.2) 60%);
  transition: all 0.3s ease;
}

.name-highlight:hover {
  background: linear-gradient(180deg, transparent 50%, rgba(127, 255, 212, 0.4) 50%);
  transform: translateY(-2px);
}

.keyword-highlight {
  font-weight: 500;
  color: #1a202c;
  position: relative;
  display: inline-block;
  background: linear-gradient(180deg, transparent 70%, rgba(255, 215, 0, 0.3) 70%);
  padding: 0 0.2rem;
  transition: all 0.3s ease;
}

.keyword-highlight:hover {
  background: linear-gradient(180deg, transparent 65%, rgba(255, 215, 0, 0.5) 65%);
  color: #00CED1;
}

/* ========================================
   経歴セクション
======================================== */
.experience-item {
  margin-bottom: 2.5rem;
  padding: 1.5rem;
  background: rgba(255, 255, 255, 0.7);
  border-radius: 12px;
  border: 1px solid rgba(127, 255, 212, 0.15);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  cursor: default;
}

.experience-item:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 24px rgba(127, 255, 212, 0.2);
  border-color: rgba(127, 255, 212, 0.4);
  background: rgba(255, 255, 255, 0.9);
}

.experience-item:last-child {
  margin-bottom: 0;
}

.experience-company {
  font-size: 1.1rem;
  font-weight: 600;
  color: #1a202c;
  margin-bottom: 0.25rem;
  transition: color 0.3s ease;
}

.experience-item:hover .experience-company {
  color: #00CED1;
}

.experience-period {
  font-size: 0.875rem;
  color: #718096;
  margin-bottom: 0.25rem;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

.experience-role {
  font-size: 0.95rem;
  color: #4a5568;
  margin-bottom: 0.5rem;
  font-style: italic;
}

.experience-description {
  color: #4a5568;
  line-height: 1.7;
}

/* ========================================
   研究発表セクション
======================================== */
.publication-category {
  font-size: 1.1rem;
  font-weight: 600;
  color: #1a202c;
  margin-top: 2rem;
  margin-bottom: 1rem;
}

.publication-category:first-child {
  margin-top: 0;
}

.publication-item {
  margin-bottom: 2rem;
  padding: 1.25rem;
  background: rgba(255, 255, 255, 0.5);
  border-radius: 10px;
  border: 1px solid rgba(127, 255, 212, 0.12);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.publication-item:hover {
  background: rgba(255, 255, 255, 0.8);
  border-color: rgba(127, 255, 212, 0.3);
  box-shadow: 0 8px 16px rgba(127, 255, 212, 0.15);
  transform: translateY(-2px);
}

.publication-item:last-child {
  margin-bottom: 0;
}

.publication-authors {
  font-size: 0.95rem;
  color: #2d3748;
  margin-bottom: 0.25rem;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

.publication-title {
  font-size: 1rem;
  font-weight: 600;
  color: #1a202c;
  margin-bottom: 0.5rem;
  line-height: 1.6;
}

.publication-venue {
  font-size: 0.875rem;
  color: #718096;
  margin-bottom: 0.5rem;
  font-style: italic;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

.publication-links {
  font-size: 0.875rem;
}

.publication-links a {
  margin-right: 0.75rem;
  position: relative;
  padding-bottom: 2px;
}

.publication-links a::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, #7FFFD4 0%, #00CED1 100%);
  transition: width 0.3s ease;
}

.publication-links a:hover::after {
  width: 100%;
}

/* ========================================
   共同研究者セクション
======================================== */
.collaborators-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
  margin-top: 2rem;
}

.collaborator-card {
  background: rgba(255, 255, 255, 0.8);
  border-radius: 16px;
  padding: 2rem;
  border: 1px solid rgba(127, 255, 212, 0.2);
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}

.collaborator-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, #7FFFD4 0%, #00CED1 100%);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.collaborator-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 16px 32px rgba(127, 255, 212, 0.25);
  border-color: rgba(127, 255, 212, 0.5);
  background: rgba(255, 255, 255, 0.95);
}

.collaborator-card:hover::before {
  transform: scaleX(1);
}

.collaborator-header {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.collaborator-icon {
  width: 48px;
  height: 48px;
  min-width: 48px;
  background: linear-gradient(135deg, rgba(127, 255, 212, 0.15), rgba(0, 206, 209, 0.15));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s ease;
}

.collaborator-icon svg {
  width: 24px;
  height: 24px;
  color: #00CED1;
  transition: all 0.3s ease;
}

.collaborator-card:hover .collaborator-icon {
  background: linear-gradient(135deg, rgba(127, 255, 212, 0.25), rgba(0, 206, 209, 0.25));
  transform: rotate(10deg) scale(1.1);
}

.collaborator-card:hover .collaborator-icon svg {
  color: #7FFFD4;
}

.collaborator-info {
  flex: 1;
}

.collaborator-name {
  font-size: 1.1rem;
  font-weight: 600;
  color: #1a202c;
  margin-bottom: 0;
  font-family: 'Noto Sans JP', serif;
  transition: color 0.3s ease;
  line-height: 1.4;
}

.collaborator-card:hover .collaborator-name {
  color: #00CED1;
}

.collaborator-title {
  font-size: 0.9rem;
  color: #718096;
  font-weight: 400;
  font-family: 'Noto Sans JP', sans-serif;
  margin-left: 0.3rem;
}

.collaborator-affiliation {
  font-size: 0.9rem;
  color: #4a5568;
  margin-bottom: 1rem;
  line-height: 1.6;
  font-weight: 500;
}

.collaborator-description {
  font-size: 0.9rem;
  color: #718096;
  line-height: 1.7;
  margin-bottom: 1.5rem;
}

.collaborator-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: #00CED1;
  font-size: 0.9rem;
  font-weight: 600;
  text-decoration: none;
  padding: 0.5rem 1rem;
  border-radius: 8px;
  background: rgba(127, 255, 212, 0.08);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  border: 1px solid rgba(127, 255, 212, 0.2);
}

.collaborator-link svg {
  width: 16px;
  height: 16px;
  transition: transform 0.3s ease;
}

.collaborator-link:hover {
  background: rgba(127, 255, 212, 0.15);
  border-color: rgba(127, 255, 212, 0.4);
  transform: translateX(4px);
  color: #20B2AA;
}

.collaborator-link:hover svg {
  transform: translate(2px, -2px);
}

/* ========================================
   プロジェクトセクション
======================================== */
.project-item {
  margin-bottom: 2.5rem;
  padding: 1.5rem;
  background: rgba(255, 255, 255, 0.7);
  border-radius: 12px;
  border: 1px solid rgba(127, 255, 212, 0.15);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  cursor: default;
}

.project-item:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 24px rgba(127, 255, 212, 0.2);
  border-color: rgba(127, 255, 212, 0.4);
  background: rgba(255, 255, 255, 0.9);
}

.project-item:last-child {
  margin-bottom: 0;
}

.project-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: #1a202c;
  margin-bottom: 0.25rem;
  transition: color 0.3s ease;
}

.project-item:hover .project-title {
  color: #00CED1;
}

.project-tech {
  font-size: 0.875rem;
  color: #718096;
  margin-bottom: 0.5rem;
  font-family: 'Monaco', 'Menlo', 'Courier New', monospace;
}

.project-description {
  color: #4a5568;
  line-height: 1.7;
  margin-bottom: 0.5rem;
}

.project-links {
  font-size: 0.875rem;
}

.project-links a {
  margin-right: 0.75rem;
  position: relative;
  padding-bottom: 2px;
}

.project-links a::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, #7FFFD4 0%, #00CED1 100%);
  transition: width 0.3s ease;
}

.project-links a:hover::after {
  width: 100%;
}

/* ========================================
   受賞歴セクション
======================================== */
.award-item {
  margin-bottom: 1.5rem;
  padding: 1rem 1.25rem;
  background: rgba(255, 255, 255, 0.5);
  border-radius: 8px;
  border-left: 3px solid #7FFFD4;
  transition: all 0.3s ease;
}

.award-item:hover {
  background: rgba(255, 255, 255, 0.8);
  border-left-color: #00CED1;
  transform: translateX(4px);
  box-shadow: 0 4px 12px rgba(127, 255, 212, 0.15);
}

.award-item:last-child {
  margin-bottom: 0;
}

.award-title {
  font-size: 0.95rem;
  color: #2d3748;
  margin-bottom: 0.25rem;
}

.award-date {
  font-size: 0.875rem;
  color: #718096;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

/* ========================================
   資格セクション
======================================== */
.certificate-item {
  margin-bottom: 1.5rem;
  padding: 1rem 1.25rem;
  background: rgba(255, 255, 255, 0.5);
  border-radius: 8px;
  border-left: 3px solid #7FFFD4;
  transition: all 0.3s ease;
}

.certificate-item:hover {
  background: rgba(255, 255, 255, 0.8);
  border-left-color: #00CED1;
  transform: translateX(4px);
  box-shadow: 0 4px 12px rgba(127, 255, 212, 0.15);
}

.certificate-item:last-child {
  margin-bottom: 0;
}

.certificate-title {
  font-size: 0.95rem;
  color: #2d3748;
  margin-bottom: 0.25rem;
}

.certificate-date {
  font-size: 0.875rem;
  color: #718096;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

/* ========================================
   ブログセクション
======================================== */
.blog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin-top: 2rem;
}

.blog-card {
  background: rgba(255, 255, 255, 0.7);
  border-radius: 16px;
  padding: 2rem;
  border: 1px solid rgba(127, 255, 212, 0.15);
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.blog-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, #7FFFD4 0%, #00CED1 100%);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.blog-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 16px 32px rgba(127, 255, 212, 0.25);
  border-color: rgba(127, 255, 212, 0.5);
  background: rgba(255, 255, 255, 0.95);
}

.blog-card:hover::before {
  transform: scaleX(1);
}

.blog-card-meta {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1rem;
}

.blog-card-date {
  font-size: 0.85rem;
  color: #718096;
  font-weight: 500;
  font-family: 'Montserrat', sans-serif;
  letter-spacing: 0.03em;
}

.blog-card-category {
  font-size: 0.75rem;
  color: #00CED1;
  font-weight: 600;
  padding: 0.25rem 0.75rem;
  background: rgba(127, 255, 212, 0.15);
  border-radius: 12px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-family: 'Montserrat', sans-serif;
}

.blog-card-title {
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: 1rem;
  line-height: 1.4;
  font-family: 'Playfair Display', 'Noto Sans JP', serif;
}

.blog-card-title a {
  color: #1a202c;
  text-decoration: none;
  transition: color 0.3s ease;
}

.blog-card-title a:hover {
  color: #00CED1;
}

.blog-card-excerpt {
  font-size: 0.95rem;
  color: #718096;
  line-height: 1.7;
  margin-bottom: 1.5rem;
  flex-grow: 1;
}

.blog-card-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: #00CED1;
  font-size: 0.9rem;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.3s ease;
  align-self: flex-start;
}

.blog-card-link svg {
  width: 18px;
  height: 18px;
  transition: transform 0.3s ease;
}

.blog-card-link:hover {
  gap: 0.75rem;
  color: #20B2AA;
}

.blog-card-link:hover svg {
  transform: translateX(4px);
}

/* 準備中カード */
.blog-card-coming-soon {
  opacity: 0.7;
  cursor: default;
  border-style: dashed;
  border-color: rgba(127, 255, 212, 0.3);
  background: rgba(255, 255, 255, 0.5);
}

.blog-card-coming-soon:hover {
  transform: none;
  box-shadow: none;
  border-color: rgba(127, 255, 212, 0.3);
  background: rgba(255, 255, 255, 0.5);
}

.blog-card-coming-soon::before {
  display: none;
}

.blog-card-coming-soon .blog-card-title {
  color: #94a3b8;
  font-style: italic;
}

.blog-card-coming-soon .blog-card-category {
  background: rgba(127, 255, 212, 0.08);
}

.blog-view-all {
  margin-top: 3rem;
  text-align: center;
}

.blog-view-all-link {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  color: #00CED1;
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  padding: 1rem 2rem;
  border-radius: 12px;
  background: rgba(127, 255, 212, 0.08);
  border: 1px solid rgba(127, 255, 212, 0.2);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  font-family: 'Montserrat', 'Noto Sans JP', sans-serif;
}

.blog-view-all-link svg {
  width: 20px;
  height: 20px;
  transition: transform 0.3s ease;
}

.blog-view-all-link:hover {
  background: rgba(127, 255, 212, 0.15);
  border-color: rgba(127, 255, 212, 0.4);
  transform: translateY(-2px);
  box-shadow: 0 8px 16px rgba(127, 255, 212, 0.2);
  color: #20B2AA;
}

.blog-view-all-link:hover svg {
  transform: translateX(4px);
}

/* ホームに戻るボタン */
.blog-back-to-home {
  margin-top: 4rem;
  padding-top: 3rem;
  border-top: 1px solid rgba(127, 255, 212, 0.2);
  text-align: center;
}

.back-to-home-button {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  color: #00CED1;
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  padding: 1rem 2.5rem;
  border-radius: 12px;
  background: rgba(127, 255, 212, 0.08);
  border: 1px solid rgba(127, 255, 212, 0.2);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  font-family: 'Montserrat', 'Noto Sans JP', sans-serif;
}

.back-to-home-button svg {
  width: 22px;
  height: 22px;
  transition: all 0.3s ease;
}

.back-to-home-button:hover {
  background: rgba(127, 255, 212, 0.15);
  border-color: rgba(127, 255, 212, 0.4);
  transform: translateY(-2px);
  box-shadow: 0 8px 16px rgba(127, 255, 212, 0.2);
  color: #20B2AA;
}

.back-to-home-button:hover svg {
  transform: scale(1.1);
}

/* 既存のブログセクション */
.blog-list {
  margin-bottom: 1.5rem;
}

.blog-item {
  margin-bottom: 1rem;
  padding: 1rem 1.25rem;
  background: rgba(255, 255, 255, 0.5);
  border-radius: 8px;
  border: 1px solid rgba(127, 255, 212, 0.12);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.blog-item:hover {
  transform: translateX(8px);
  background: rgba(255, 255, 255, 0.9);
  border-color: rgba(127, 255, 212, 0.3);
  box-shadow: 0 4px 12px rgba(127, 255, 212, 0.15);
}

.blog-item:last-child {
  margin-bottom: 0;
}

.blog-date {
  font-size: 0.875rem;
  color: #718096;
  margin-bottom: 0.25rem;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

.blog-title-link a {
  font-size: 0.95rem;
  font-weight: 500;
  color: #2d3748;
  text-decoration: none;
  transition: all 0.3s ease;
  display: inline-block;
}

.blog-title-link a:hover {
  color: #00CED1;
  transform: translateX(4px);
}

/* ========================================
   レスポンシブデザイン
======================================== */
@media (max-width: 1024px) {
  .main-content {
    padding: 3rem 3rem 4rem;
  }
}

@media (max-width: 768px) {
  body {
    display: block;
  }

  .sidebar {
    position: static;
    width: 100%;
    border-right: none;
    box-shadow: 0 2px 8px rgba(127, 255, 212, 0.12);
    padding: 2rem 1.5rem;
    padding-bottom: 1rem;
  }

  .sidebar-header {
    margin-bottom: 2rem;
  }

  .sidebar-title {
    font-size: 1.3rem;
  }

  .sidebar-nav ul {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem 1.5rem;
  }

  .sidebar-nav li {
    margin-bottom: 0;
  }
  
  .current-date {
    top: 1rem;
    right: 5rem;
    padding: 0.45rem 0.85rem;
    font-size: 0.75rem;
  }

  .date-weekday {
    font-size: 0.7rem;
  }
  
  .dark-mode-toggle {
    top: 1rem;
    right: 1rem;
    width: 40px;
    height: 40px;
  }

  .main-content {
    margin-left: 0;
    padding: 2rem 1.5rem 3rem;
    max-width: 100%;
  }

  .section-title {
    font-size: 2rem;
  }
  
  .sidebar-title {
    font-size: 1.75rem;
  }
  
  .collaborators-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  
  .collaborator-card {
    padding: 1.5rem;
  }
  
  .blog-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  
  .blog-card {
    padding: 1.5rem;
  }
}

@media (max-width: 480px) {
  .sidebar {
    padding: 1.5rem 1rem;
  }

  .main-content {
    padding: 1.5rem 1rem 2rem;
  }

  .section-title {
    font-size: 1.75rem;
  }
  
  .sidebar-title {
    font-size: 1.5rem;
  }

  .sidebar-nav ul {
    flex-direction: column;
    gap: 0.25rem;
  }
  
  .intro-text {
    font-size: 1rem;
    padding-left: 1rem;
  }
  
  .intro-text::before {
    font-size: 2rem;
  }
  
  .current-date {
    top: 4.5rem;
    right: 0.75rem;
    padding: 0.4rem 0.7rem;
    font-size: 0.7rem;
    gap: 0.25rem;
  }

  .date-weekday {
    display: none;
  }
  
  .dark-mode-toggle {
    top: 0.75rem;
    right: 0.75rem;
    width: 38px;
    height: 38px;
  }
  
  .toggle-icon {
    width: 18px;
    height: 18px;
  }
}

/* ========================================
   ダークモード
======================================== */
body.dark-mode {
  background: linear-gradient(135deg, #0a1929 0%, #1a2332 50%, #0f1b2a 100%);
  color: #e2e8f0;
}

body.dark-mode .current-date {
  background: rgba(15, 27, 42, 0.85);
  border-color: rgba(127, 255, 212, 0.3);
  color: #cbd5e1;
}

body.dark-mode .date-weekday {
  color: #7FFFD4;
  border-left-color: rgba(127, 255, 212, 0.4);
}

body.dark-mode .sidebar {
  background: rgba(15, 27, 42, 0.95);
  box-shadow: 2px 0 30px rgba(127, 255, 212, 0.15);
}

body.dark-mode .sidebar-title {
  color: #f1f5f9;
}

body.dark-mode .name-first {
  background: linear-gradient(135deg, #7FFFD4 0%, #00CED1 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

body.dark-mode .name-second {
  color: #f1f5f9;
}

body.dark-mode .sidebar-title-link:hover .name-second {
  color: #7FFFD4;
}

body.dark-mode .profile-image-link:hover .profile-image {
  border-color: rgba(127, 255, 212, 0.5);
  box-shadow: 0 8px 24px rgba(127, 255, 212, 0.35);
}

body.dark-mode .sidebar-subtitle {
  color: #94a3b8;
}

body.dark-mode .subtitle-line::before {
  color: rgba(127, 255, 212, 0.4);
}

body.dark-mode .subtitle-line:hover::before {
  color: #7FFFD4;
}

body.dark-mode .subtitle-line a {
  color: #94a3b8;
}

body.dark-mode .subtitle-line a:hover {
  color: #7FFFD4;
  text-decoration-color: rgba(127, 255, 212, 0.5);
}

body.dark-mode .subtitle-accent {
  color: #7FFFD4;
}

body.dark-mode .subtitle-accent::before {
  color: #00CED1;
}

body.dark-mode .sidebar-nav a {
  color: #cbd5e1;
}

body.dark-mode .sidebar-nav a:hover {
  color: #7FFFD4;
  background: rgba(127, 255, 212, 0.1);
}

body.dark-mode .sidebar-nav a.active {
  color: #7FFFD4;
  background: rgba(127, 255, 212, 0.15);
}

body.dark-mode .dark-mode-toggle {
  background: rgba(15, 27, 42, 0.8);
  border-color: rgba(127, 255, 212, 0.3);
}

body.dark-mode .dark-mode-toggle:hover {
  background: rgba(15, 27, 42, 0.9);
  border-color: rgba(127, 255, 212, 0.5);
}

body.dark-mode .moon-icon {
  fill: #7FFFD4;
}

body.dark-mode .sun-icon {
  stroke: #7FFFD4;
}

body.dark-mode .sun-icon circle {
  fill: #7FFFD4;
}

body.dark-mode .profile-image {
  border-color: rgba(127, 255, 212, 0.4);
  box-shadow: 0 4px 12px rgba(127, 255, 212, 0.25);
}

body.dark-mode .section-title {
  color: #f1f5f9;
}

body.dark-mode .title-text::before {
  color: rgba(127, 255, 212, 0.2);
}

body.dark-mode .section-title:hover .title-text {
  color: #7FFFD4;
}

body.dark-mode .section-title:hover .title-text::before {
  color: rgba(127, 255, 212, 0.3);
}

body.dark-mode .intro-text {
  border-left-color: rgba(127, 255, 212, 0.4);
}

body.dark-mode .intro-text::before {
  color: rgba(127, 255, 212, 0.2);
}

body.dark-mode .name-highlight {
  color: #7FFFD4;
  background: linear-gradient(180deg, transparent 60%, rgba(127, 255, 212, 0.15) 60%);
}

body.dark-mode .name-highlight:hover {
  background: linear-gradient(180deg, transparent 50%, rgba(127, 255, 212, 0.25) 50%);
}

body.dark-mode .keyword-highlight {
  color: #e2e8f0;
  background: linear-gradient(180deg, transparent 70%, rgba(255, 215, 0, 0.2) 70%);
}

body.dark-mode .keyword-highlight:hover {
  color: #7FFFD4;
  background: linear-gradient(180deg, transparent 65%, rgba(255, 215, 0, 0.35) 65%);
}

body.dark-mode .collaborator-card {
  background: rgba(15, 27, 42, 0.7);
  border-color: rgba(127, 255, 212, 0.2);
}

body.dark-mode .collaborator-card:hover {
  background: rgba(15, 27, 42, 0.9);
  border-color: rgba(127, 255, 212, 0.5);
  box-shadow: 0 16px 32px rgba(127, 255, 212, 0.3);
}

body.dark-mode .collaborator-name {
  color: #f1f5f9;
}

body.dark-mode .collaborator-card:hover .collaborator-name {
  color: #7FFFD4;
}

body.dark-mode .collaborator-title {
  color: #94a3b8;
}

body.dark-mode .collaborator-affiliation {
  color: #cbd5e1;
}

body.dark-mode .collaborator-description {
  color: #94a3b8;
}

body.dark-mode .collaborator-icon {
  background: linear-gradient(135deg, rgba(127, 255, 212, 0.15), rgba(0, 206, 209, 0.15));
}

body.dark-mode .collaborator-card:hover .collaborator-icon {
  background: linear-gradient(135deg, rgba(127, 255, 212, 0.3), rgba(0, 206, 209, 0.3));
}

body.dark-mode .collaborator-icon svg {
  color: #7FFFD4;
}

body.dark-mode .collaborator-link {
  background: rgba(127, 255, 212, 0.1);
  border-color: rgba(127, 255, 212, 0.25);
  color: #7FFFD4;
}

body.dark-mode .collaborator-link:hover {
  background: rgba(127, 255, 212, 0.2);
  border-color: rgba(127, 255, 212, 0.5);
  color: #00CED1;
}

body.dark-mode .experience-item,
body.dark-mode .project-item {
  background: rgba(15, 27, 42, 0.6);
  border-color: rgba(127, 255, 212, 0.2);
}

body.dark-mode .experience-item:hover,
body.dark-mode .project-item:hover {
  background: rgba(15, 27, 42, 0.8);
  border-color: rgba(127, 255, 212, 0.5);
  box-shadow: 0 12px 24px rgba(127, 255, 212, 0.25);
}

body.dark-mode .experience-company,
body.dark-mode .project-title {
  color: #f1f5f9;
}

body.dark-mode .experience-item:hover .experience-company,
body.dark-mode .project-item:hover .project-title {
  color: #7FFFD4;
}

body.dark-mode .experience-period,
body.dark-mode .experience-role,
body.dark-mode .experience-description,
body.dark-mode .project-tech,
body.dark-mode .project-description {
  color: #cbd5e1;
}

body.dark-mode .publication-item {
  background: rgba(15, 27, 42, 0.5);
  border-color: rgba(127, 255, 212, 0.18);
}

body.dark-mode .publication-item:hover {
  background: rgba(15, 27, 42, 0.7);
  border-color: rgba(127, 255, 212, 0.4);
  box-shadow: 0 8px 16px rgba(127, 255, 212, 0.2);
}

body.dark-mode .publication-category,
body.dark-mode .publication-title {
  color: #f1f5f9;
}

body.dark-mode .publication-authors,
body.dark-mode .publication-venue {
  color: #cbd5e1;
}

body.dark-mode .award-item,
body.dark-mode .certificate-item {
  background: rgba(15, 27, 42, 0.5);
  border-left-color: #7FFFD4;
}

body.dark-mode .award-item:hover,
body.dark-mode .certificate-item:hover {
  background: rgba(15, 27, 42, 0.7);
  border-left-color: #00CED1;
  box-shadow: 0 4px 12px rgba(127, 255, 212, 0.2);
}

body.dark-mode .award-title,
body.dark-mode .certificate-title {
  color: #e2e8f0;
}

body.dark-mode .award-date,
body.dark-mode .certificate-date {
  color: #94a3b8;
}

body.dark-mode .blog-item {
  background: rgba(15, 27, 42, 0.5);
  border-color: rgba(127, 255, 212, 0.18);
}

body.dark-mode .blog-item:hover {
  background: rgba(15, 27, 42, 0.7);
  border-color: rgba(127, 255, 212, 0.4);
  box-shadow: 0 4px 12px rgba(127, 255, 212, 0.2);
}

body.dark-mode .blog-date {
  color: #94a3b8;
}

body.dark-mode .blog-title-link a {
  color: #e2e8f0;
}

body.dark-mode .blog-title-link a:hover {
  color: #7FFFD4;
}

body.dark-mode .blog-card {
  background: rgba(15, 27, 42, 0.7);
  border-color: rgba(127, 255, 212, 0.2);
}

body.dark-mode .blog-card:hover {
  background: rgba(15, 27, 42, 0.9);
  border-color: rgba(127, 255, 212, 0.5);
  box-shadow: 0 16px 32px rgba(127, 255, 212, 0.3);
}

body.dark-mode .blog-card-date {
  color: #94a3b8;
}

body.dark-mode .blog-card-category {
  color: #7FFFD4;
  background: rgba(127, 255, 212, 0.15);
}

body.dark-mode .blog-card-title a {
  color: #f1f5f9;
}

body.dark-mode .blog-card-title a:hover {
  color: #7FFFD4;
}

body.dark-mode .blog-card-excerpt {
  color: #94a3b8;
}

body.dark-mode .blog-card-link {
  color: #7FFFD4;
}

body.dark-mode .blog-card-link:hover {
  color: #00CED1;
}

body.dark-mode .blog-view-all-link {
  background: rgba(127, 255, 212, 0.1);
  border-color: rgba(127, 255, 212, 0.25);
  color: #7FFFD4;
}

body.dark-mode .blog-view-all-link:hover {
  background: rgba(127, 255, 212, 0.2);
  border-color: rgba(127, 255, 212, 0.5);
  color: #00CED1;
}

body.dark-mode .blog-card-coming-soon {
  opacity: 0.6;
  border-color: rgba(127, 255, 212, 0.2);
  background: rgba(15, 27, 42, 0.5);
}

body.dark-mode .blog-card-coming-soon:hover {
  border-color: rgba(127, 255, 212, 0.2);
  background: rgba(15, 27, 42, 0.5);
}

body.dark-mode .blog-card-coming-soon .blog-card-title {
  color: #64748b;
}

body.dark-mode .blog-back-to-home {
  border-top-color: rgba(127, 255, 212, 0.2);
}

body.dark-mode .back-to-home-button {
  background: rgba(127, 255, 212, 0.1);
  border-color: rgba(127, 255, 212, 0.25);
  color: #7FFFD4;
}

body.dark-mode .back-to-home-button:hover {
  background: rgba(127, 255, 212, 0.2);
  border-color: rgba(127, 255, 212, 0.5);
  color: #00CED1;
  box-shadow: 0 8px 16px rgba(127, 255, 212, 0.25);
}

body.dark-mode a {
  color: #7FFFD4;
}

body.dark-mode a:hover {
  color: #00CED1;
}

body.dark-mode #about p,
body.dark-mode .blog-post-content p {
  color: #cbd5e1;
}

body.dark-mode .blog-post-meta,
body.dark-mode .blog-post-title {
  color: #f1f5f9;
}

/* ========================================
   アクセシビリティ: 動きを減らす設定
======================================== */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  html {
    scroll-behavior: auto;
  }
}

/* ========================================
   印刷スタイル
======================================== */
@media print {
  .sidebar-nav {
    display: none;
  }

  .main-content {
    margin-left: 0;
  }

  body {
    font-size: 12pt;
  }

  section {
    page-break-inside: avoid;
  }
}