/* ==========================================================================
   MONOCHROME WIREFRAME STYLE (SINGLE PAGE & MOBILE OPTIMIZED)
   ========================================================================== */

:root {
  --bg-color: #ffffff;
  --text-color: #222222;
  --text-muted: #666666;
  --border-color: #e0e0e0;
  --border-color-dark: #000000;
  --bg-secondary: #f9f9f9;
  --bg-badge: #f0f0f0;
  
  --container-max-width: 1000px;
  --font-sans: 'Noto Sans JP', -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

/* Reset & Base */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  background-color: var(--bg-color);
  color: var(--text-color);
  font-family: var(--font-sans);
  line-height: 1.7;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

/* フォント強制継承ルール */
input, select, textarea, button {
  font-family: inherit;
  color: inherit;
}

/* Container */
.container {
  width: 100%;
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 1rem;
}

@media (min-width: 768px) {
  .container {
    padding: 0 1.5rem;
  }
}

/* Header & Nav */
.header {
  border-bottom: 1px solid var(--border-color);
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(4px);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-container {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 0.5rem;
  padding: 0.8rem 1rem;
  max-width: var(--container-max-width);
  margin: 0 auto;
}

@media (min-width: 768px) {
  .header-container {
    flex-direction: row;
    justify-content: space-between;
    height: 4.5rem;
    padding: 0 1.5rem;
  }
}

.logo {
  font-size: 1.15rem;
  font-weight: 900;
  letter-spacing: 0.05em;
  color: var(--text-color);
  text-decoration: none;
}

@media (min-width: 768px) {
  .logo {
    font-size: 1.25rem;
  }
}

.nav {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  justify-content: center;
}

@media (min-width: 768px) {
  .nav {
    gap: 1.5rem;
  }
}

.nav-link {
  text-decoration: none;
  color: var(--text-muted);
  font-weight: 500;
  font-size: 0.85rem;
  transition: color 0.2s;
  padding: 0.2rem 0;
}

@media (min-width: 768px) {
  .nav-link {
    font-size: 0.95rem;
  }
}

.nav-link:hover {
  color: var(--text-color);
}

/* Main Content Area */
.main {
  flex-grow: 1;
  padding-top: 2rem;
  padding-bottom: 4rem;
}

@media (min-width: 768px) {
  .main {
    padding-top: 3rem;
    padding-bottom: 6rem;
  }
}

/* Sections */
.section {
  margin-bottom: 3.5rem;
  scroll-mt: 7.5rem;
}

@media (min-width: 768px) {
  .section {
    margin-bottom: 5rem;
    scroll-mt: 6rem;
  }
}

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border-color-dark);
  padding-bottom: 0.4rem;
  margin-bottom: 1.5rem;
  gap: 1rem;
  flex-wrap: wrap;
}

@media (min-width: 768px) {
  .section-header {
    padding-bottom: 0.5rem;
    margin-bottom: 2rem;
  }
}

/* タイトルエリア（タイトル ＋ トグルボタンのインライン並び用） */
.title-area {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-wrap: wrap; /* スマホで折り返せるように */
}

.section-title {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-color);
  text-transform: uppercase;
  letter-spacing: 0.02em;
}

@media (min-width: 768px) {
  .section-title {
    font-size: 1.5rem;
  }
}

/* ★ タイトル横のアコーディオン開閉トグルリンク */
.section-toggle-link {
  background: none;
  border: none;
  font-size: 0.72rem;
  font-weight: bold;
  color: var(--text-muted);
  cursor: pointer;
  outline: none;
  padding: 0.2rem 0.4rem;
  text-decoration: none;
  transition: color 0.15s;
}

@media (min-width: 768px) {
  .section-toggle-link {
    font-size: 0.8rem;
  }
}

.section-toggle-link:hover {
  color: var(--text-color);
  text-decoration: underline;
}

/* Selectors (表示列数選択) */
.selector-wrapper {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.select-label {
  font-size: 0.7rem;
  font-weight: bold;
  color: var(--text-muted);
}

.neo-select {
  font-size: 0.75rem;
  font-weight: bold;
  border: 1px solid var(--border-color-dark);
  background-color: var(--bg-color);
  padding: 0.15rem 0.4rem;
  outline: none;
  cursor: pointer;
  border-radius: 2px;
  color: var(--text-color);
}

.neo-select:hover {
  background-color: var(--bg-secondary);
}

/* ★ 技術タグフィルターコンテナ */
.filter-container {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}

/* ★ 技術タグフィルターチップ */
.filter-chip {
  background-color: var(--bg-color);
  border: 1px solid var(--border-color-dark);
  color: var(--text-color);
  font-size: 0.7rem;
  font-weight: bold;
  padding: 0.25rem 0.75rem;
  cursor: pointer;
  border-radius: 2px;
  transition: background-color 0.15s, color 0.15s;
  outline: none;
}

@media (min-width: 768px) {
  .filter-chip {
    font-size: 0.75rem;
  }
}

.filter-chip:hover {
  background-color: var(--bg-secondary);
}

.filter-chip.active {
  background-color: var(--border-color-dark);
  color: var(--bg-color);
}

/* Hero Section */
.hero-section {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 3rem 1.25rem;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  margin-bottom: 3.5rem;
  border-radius: 4px;
}

@media (min-width: 768px) {
  .hero-section {
    padding: 4.5rem 2rem;
    margin-bottom: 5rem;
  }
}

/* アバターアイコンコンテナ */
.hero-avatar-wrapper {
  width: 90px;
  height: 90px;
  border-radius: 50%;
  border: 2px solid var(--border-color-dark);
  overflow: hidden;
  background-color: var(--bg-color);
  margin: 0 auto 1.2rem auto; /* 左右マージンをautoにして確実に完全中央寄せにする */
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
  flex-shrink: 0; /* フレックス縮小・潰れ防止 */
}

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

/* デフォルトプレースホルダー用SVG */
.avatar-svg-placeholder {
  width: 100%;
  height: 100%;
  padding: 0.5rem;
}

.hero-title {
  font-size: 1.8rem;
  font-weight: 900;
  margin-bottom: 0.8rem;
  color: var(--text-color);
  line-height: 1.3;
}

@media (min-width: 768px) {
  .hero-title {
    font-size: 2.4rem;
    margin-bottom: 1rem;
    line-height: 1.2;
  }
}

.hero-subtitle {
  font-size: 0.95rem;
  color: var(--text-muted);
  font-weight: 400;
  max-width: 600px;
}

@media (min-width: 768px) {
  .hero-subtitle {
    font-size: 1.1rem;
  }
}

@media (min-width: 768px) {
  .image-placeholder {
    font-size: 0.8rem;
    padding: 1rem;
  }
}

/* About Section */
.neo-paper {
  background-color: var(--bg-color);
  border: 1px solid var(--border-color);
  padding: 1.5rem 1.25rem;
  border-radius: 4px;
}

@media (min-width: 768px) {
  .neo-paper {
    padding: 3rem;
  }
}

.profile-affiliation {
  font-size: 0.95rem;
}

.profile-group {
  font-size: 0.95rem;
  color: var(--text-muted);
}

@media (min-width: 768px) {
  .profile-affiliation,
  .profile-group {
    font-size: 1.05rem;
  }
}

.profile-text {
  font-size: 0.9rem;
}

@media (min-width: 768px) {
  .profile-text {
    font-size: 0.95rem;
  }
}

/* Grid System */
.grid {
  display: grid;
  grid-template-cols: 1fr;
  gap: 1.5rem;
  justify-content: center;
}

@media (min-width: 768px) {
  .grid {
    grid-template-cols: repeat(2, 1fr);
    gap: 2rem;
  }
}

/* Cards (Products - Mobile & PC Size Optimized) */
.card {
  border: 1px solid var(--border-color);
  background-color: var(--bg-color);
  display: flex;
  flex-direction: column;
  transition: border-color 0.2s, box-shadow 0.2s;
  border-radius: 4px;
  overflow: hidden;
  height: auto;
  width: 100%;
  max-width: 340px;
  margin: 0 auto;
}

@media (min-width: 768px) {
  .card {
    max-width: 100%;
    margin: 0;
  }
}

.card:hover {
  border-color: var(--border-color-dark);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.card-image-wrapper {
  width: 100%;
  aspect-ratio: 16 / 9;
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  padding: 0;
}

.card-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.9;
  transition: opacity 0.2s;
}

.card:hover .card-image {
  opacity: 1;
}

.card-body {
  padding: 1.1rem;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

@media (min-width: 768px) {
  .card-body {
    padding: 1.3rem;
  }
}

.card-title {
  font-size: 1rem;
  font-weight: 800;
  margin-bottom: 0.4rem;
  line-height: 1.4;
}

@media (min-width: 768px) {
  .card-title {
    font-size: 1.1rem;
  }
}

.card-desc {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
  flex-grow: 1;
  line-height: 1.6;
}

@media (min-width: 768px) {
  .card-desc {
    font-size: 0.85rem;
    margin-bottom: 1.2rem;
  }
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem;
  margin-bottom: 1rem;
}

.tag {
  font-size: 0.65rem;
  font-weight: bold;
  background-color: var(--bg-badge);
  color: var(--text-muted);
  padding: 0.1rem 0.4rem;
  border-radius: 2px;
}

.card-btn {
  width: 100%;
  padding: 0.5rem;
  background-color: var(--bg-color);
  color: var(--text-color);
  border: 1px solid var(--border-color-dark);
  font-weight: bold;
  font-size: 0.78rem;
  cursor: pointer;
  transition: background-color 0.2s, color 0.2s;
  text-align: center;
  border-radius: 2px;
  outline: none;
  margin-top: auto;
}

.card-btn:hover {
  background-color: var(--border-color-dark);
  color: var(--bg-color);
}

/* List Style (Awards / Activities) */
.list {
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
}

.list-item {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  padding: 1rem;
  border: 1px solid var(--border-color);
  background-color: var(--bg-color);
  border-radius: 4px;
  transition: border-color 0.2s;
  width: 100%;
  max-width: 600px;
  margin: 0 auto;
}

.list-item:hover {
  border-color: var(--border-color-dark);
}

@media (min-width: 768px) {
  .list-item {
    flex-direction: row;
    gap: 1.5rem;
    padding: 1.25rem;
    max-width: 100%;
  }
}

.list-date {
  font-family: monospace;
  font-weight: bold;
  font-size: 0.85rem;
  color: var(--text-muted);
  min-width: 80px;
  flex-shrink: 0;
}

.list-content {
  flex-grow: 1;
}

.list-title {
  font-size: 0.95rem;
  font-weight: 800;
  margin-bottom: 0.2rem;
}

.list-desc {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 0.4rem;
}

.list-btn {
  background: none;
  border: none;
  font-size: 0.75rem;
  font-weight: bold;
  color: var(--text-color);
  text-decoration: underline;
  cursor: pointer;
  padding: 0;
  outline: none;
}

.list-btn:hover {
  color: var(--text-muted);
}

/* Reading List (Books Grid) */
.books-grid {
  display: grid;
  grid-template-cols: repeat(3, 1fr);
  gap: 0.6rem;
}

@media (min-width: 768px) {
  .books-grid {
    grid-template-cols: repeat(4, 1fr);
    gap: 1.2rem;
  }
}

.book-card {
  border: 1px solid var(--border-color);
  background-color: var(--bg-color);
  display: flex;
  flex-direction: column;
  border-radius: 4px;
  overflow: hidden;
}

.book-cover-wrapper {
  aspect-ratio: 3 / 4;
  background-color: #ffffff;
  border-bottom: 1px solid var(--border-color);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0.4rem;
}

@media (min-width: 768px) {
  .book-cover-wrapper {
    padding: 0.6rem;
  }
}

.book-cover {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.book-info {
  padding: 0.6rem;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.book-title {
  font-size: 0.7rem;
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 0.15rem;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

@media (min-width: 768px) {
  .book-title {
    font-size: 0.8rem;
    margin-bottom: 0.2rem;
  }
}

.book-author {
  font-size: 0.65rem;
  color: var(--text-muted);
  margin-bottom: 0.4rem;
}

/* Tools Section Chips */
.tools-container {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  justify-content: center;
}

@media (min-width: 768px) {
  .tools-container {
    justify-content: flex-start;
  }
}

.tool-chip {
  font-family: monospace;
  font-size: 0.75rem;
  font-weight: bold;
  padding: 0.3rem 0.8rem;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-color);
  border-radius: 4px;
}

/* Links & Certifications */
.links-certs-grid {
  display: grid;
  grid-template-cols: 1fr;
  gap: 1.5rem;
}

@media (min-width: 768px) {
  .links-certs-grid {
    grid-template-cols: repeat(2, 1fr);
    gap: 2rem;
  }
}

.subsection-title {
  font-size: 1.05rem;
  font-weight: 800;
  margin-bottom: 1rem;
  border-bottom: 1px solid var(--border-color-dark);
  padding-bottom: 0.3rem;
}

.certifications-list {
  list-style: none;
}

.certifications-list li {
  font-size: 0.8rem;
  margin-bottom: 0.8rem;
  border-bottom: 1px dashed var(--border-color);
  padding-bottom: 0.4rem;
}

.certifications-list li:last-child {
  border-bottom: none;
}

.cert-date {
  font-family: monospace;
  font-weight: bold;
  color: var(--text-muted);
  margin-right: 0.4rem;
}

.cert-title {
  font-weight: bold;
}

.cert-desc {
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-top: 0.2rem;
}

.links-list {
  list-style: none;
}

.links-list li {
  font-size: 0.85rem;
  margin-bottom: 0.8rem;
}

.links-list a {
  font-weight: bold;
  color: var(--text-color);
  text-decoration: underline;
}

.links-list a:hover {
  color: var(--text-muted);
}

.url-desc {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* Simple Contact Display */
.contact-email-link {
  text-decoration: none;
  font-family: monospace;
  font-size: 1.05rem;
  font-weight: 900;
  color: var(--text-color);
  border: 1px solid var(--border-color-dark);
  padding: 0.7rem 1.2rem;
  display: inline-block;
  transition: background-color 0.2s, color 0.2s;
  border-radius: 4px;
  max-width: 100%;
  word-break: break-all;
}

@media (min-width: 768px) {
  .contact-email-link {
    font-size: 1.2rem;
    padding: 0.8rem 2rem;
  }
}

.contact-email-link:hover {
  background-color: var(--border-color-dark);
  color: var(--bg-color) !important;
}

/* Native Modal Dialog Styling */
.modal {
  border: 1px solid var(--border-color-dark);
  border-radius: 6px;
  width: 92%;
  max-width: 680px;
  margin: auto;
  background-color: var(--bg-color);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
  padding: 0;
}

.modal::backdrop {
  background-color: rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(2px);
}

.modal-box {
  position: relative;
  padding: 2.2rem 1.25rem;
  max-height: 82vh;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

@media (min-width: 768px) {
  .modal-box {
    padding: 2.5rem 2rem;
    max-height: 85vh;
  }
}

.modal-close {
  position: absolute;
  top: 0.8rem;
  right: 1rem;
  background: none;
  border: none;
  font-size: 1.6rem;
  font-weight: 300;
  cursor: pointer;
  color: var(--text-muted);
  line-height: 1;
  z-index: 10;
  outline: none;
}

@media (min-width: 768px) {
  .modal-close {
    top: 1rem;
    right: 1.25rem;
    font-size: 1.8rem;
  }
}

.modal-close:hover {
  color: var(--text-color);
}

.modal-content h3 {
  font-size: 1.2rem;
  font-weight: 900;
  margin-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.5rem;
}

@media (min-width: 768px) {
  .modal-content h3 {
    font-size: 1.4rem;
  }
}

.modal-section {
  margin-bottom: 1.2rem;
}

@media (min-width: 768px) {
  .modal-section {
    margin-bottom: 1.5rem;
  }
}

.modal-section-title {
  font-size: 0.7rem;
  font-weight: 800;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.25rem;
}

@media (min-width: 768px) {
  .modal-section-title {
    font-size: 0.75rem;
  }
}

.modal-desc {
  font-size: 0.9rem;
  color: var(--text-color);
}

@media (min-width: 768px) {
  .modal-desc {
    font-size: 0.95rem;
  }
}

.modal-secret {
  background-color: var(--bg-secondary);
  border-left: 3px solid var(--border-color-dark);
  padding: 0.8rem;
  font-size: 0.85rem;
  line-height: 1.5;
}

@media (min-width: 768px) {
  .modal-secret {
    padding: 1rem;
    font-size: 0.9rem;
    line-height: 1.6;
  }
}

.modal-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 1.5rem;
  border-top: 1px solid var(--border-color);
  padding-top: 1rem;
}

@media (min-width: 768px) {
  .modal-links {
    gap: 1.5rem;
    margin-top: 2rem;
    padding-top: 1.25rem;
  }
}

.modal-link-btn {
  text-decoration: none;
  font-size: 0.8rem;
  font-weight: bold;
  color: var(--text-color);
  border: 1px solid var(--border-color-dark);
  padding: 0.45rem 0.8rem;
  transition: background-color 0.2s, color 0.2s;
  border-radius: 2px;
}

@media (min-width: 768px) {
  .modal-link-btn {
    font-size: 0.85rem;
    padding: 0.5rem 1rem;
  }
}

.modal-link-btn:hover {
  background-color: var(--border-color-dark);
  color: var(--bg-color);
}

/* Markdown parsing typography inside Modal */
.markdown-body h1 {
  font-size: 1.4rem;
  border-bottom: 2px solid var(--border-color-dark);
  padding-bottom: 0.3rem;
  margin-bottom: 1rem;
}

@media (min-width: 768px) {
  .markdown-body h1 {
    font-size: 1.6rem;
    padding-bottom: 0.4rem;
    margin-bottom: 1.2rem;
  }
}

.markdown-body h2 {
  font-size: 1.1rem;
  margin-top: 1.2rem;
  margin-bottom: 0.6rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.15rem;
}

@media (min-width: 768px) {
  .markdown-body h2 {
    font-size: 1.2rem;
    margin-top: 1.5rem;
    margin-bottom: 0.8rem;
    padding-bottom: 0.2rem;
  }
}

.markdown-body h3 {
  font-size: 0.95rem;
  margin-top: 1rem;
  margin-bottom: 0.4rem;
}

.markdown-body p {
  margin-bottom: 0.8rem;
  font-size: 0.85rem;
}

@media (min-width: 768px) {
  .markdown-body p {
    margin-bottom: 1rem;
    font-size: 0.9rem;
  }
}

.markdown-body ul {
  margin-bottom: 1rem;
  padding-left: 1.1rem;
}

.markdown-body li {
  margin-bottom: 0.25rem;
  font-size: 0.85rem;
}

@media (min-width: 768px) {
  .markdown-body li {
    font-size: 0.9rem;
  }
}

.markdown-body code {
  font-family: monospace;
  font-size: 0.75rem;
  background-color: var(--bg-badge);
  padding: 0.1rem 0.25rem;
  border-radius: 2px;
}

/* Footer */
.footer {
  border-top: 1px solid var(--border-color);
  padding: 2rem 0;
  background-color: var(--bg-secondary);
  text-align: center;
  font-size: 0.75rem;
  color: var(--text-muted);
}

@media (min-width: 768px) {
  .footer {
    padding: 2.5rem 0;
    font-size: 0.8rem;
  }
}

/* スパム対策メールアドレス表示 */
.contact-email-display {
  font-family: monospace;
  font-size: 1.05rem;
  font-weight: 900;
  color: var(--text-color);
  border: 1px solid var(--border-color-dark);
  padding: 0.7rem 1.2rem;
  display: inline-block;
  background-color: var(--bg-secondary);
  border-radius: 4px;
  max-width: 100%;
  word-break: break-all;
  user-select: all; /* トリプルクリックで簡単にコピー可能 */
  cursor: text;
}

@media (min-width: 768px) {
  .contact-email-display {
    font-size: 1.2rem;
    padding: 0.8rem 2rem;
  }
}

/* Blog Section styles */
.blog-list {
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
  list-style: none;
  padding: 0;
  margin: 0;
}

.blog-item {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  border-bottom: 1px dashed var(--border-color);
  padding-bottom: 0.8rem;
  font-size: 0.95rem;
}

.blog-item:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.blog-date {
  font-family: monospace;
  font-size: 0.85rem;
  color: var(--text-muted);
  flex-shrink: 0;
  min-width: 65px;
}

.blog-category {
  font-size: 0.7rem;
  padding: 0.1rem 0.4rem;
  border: 1px solid var(--border-color-dark);
  background-color: var(--bg-secondary);
  color: var(--text-muted);
  border-radius: 2px;
  flex-shrink: 0;
  text-transform: uppercase;
  font-weight: bold;
}

.blog-title-link {
  color: var(--text-color);
  text-decoration: underline;
  font-weight: 900;
  transition: color 0.15s;
  word-break: break-all;
}

.blog-title-link:hover {
  color: var(--border-color-dark);
}