/* ========== カラー変数と基本設定 ========== */

:root {
    /* プライマリーカラー */
    --primary-color: #3498db;
    --primary-dark: #2980b9;
    --primary-light: #e3f2fd;
    --primary-alpha: rgba(52, 152, 219, 0.1);
    
    /* セカンダリーカラー */
    --secondary-color: #9b59b6;
    --secondary-dark: #8e44ad;
    --secondary-light: #f3e5f5;
    --secondary-alpha: rgba(155, 89, 182, 0.1);
    
    /* アクセントカラー1 */
    --accent1-color: #f39c12;
    --accent1-dark: #e67e22;
    --accent1-light: #fff8e1;
    --accent1-alpha: rgba(243, 156, 18, 0.1);
    
    /* アクセントカラー2 - アクティブ状態 */
    --accent2-color: #28a745;
    --accent2-dark: #218838;
    --accent2-light: #e8f5e9;
    --accent2-alpha: rgba(40, 167, 69, 0.1);
    --active-color: var(--accent2-color);
    --active-dark: var(--accent2-dark);
    --active-light: var(--accent2-light);
    --active-alpha: var(--accent2-alpha);
    
    /* テキストカラー */
    --text-color: #333;
    --text-light: #666;
    --text-lighter: #888;
    
    /* 背景と影 */
    --background-color: #f8f9fa;
    --card-background: #ffffff;
    --shadow-color: rgba(0, 0, 0, 0.03);
    --shadow-hover: rgba(0, 0, 0, 0.06);
    
    /* レイアウト変数 */
    --border-radius: 12px;
    --card-radius: 16px;
    --section-spacing: 3rem;
    --transition-speed: 0.3s;
}

/* ダークモード設定 */
.dark {
    /* プライマリーカラー */
    --primary-color: #58a6ff;
    --primary-dark: #82bcff;
    --primary-light: #142e45;
    --primary-alpha: rgba(88, 166, 255, 0.15);
    
    /* セカンダリーカラー */
    --secondary-color: #bb86fc;
    --secondary-dark: #d2b1fc;
    --secondary-light: #251830;
    --secondary-alpha: rgba(187, 134, 252, 0.15);
    
    /* アクセントカラー1 */
    --accent1-color: #ffc107;
    --accent1-dark: #ffca28;
    --accent1-light: #2a2200;
    --accent1-alpha: rgba(255, 193, 7, 0.15);
    
    /* アクセントカラー2 - アクティブ状態 */
    --accent2-color: #3ebc5c;
    --accent2-dark: #4cd368;
    --accent2-light: #092211;
    --accent2-alpha: rgba(62, 188, 92, 0.15);
    --active-color: var(--accent2-color);
    --active-dark: var(--accent2-dark);
    --active-light: var(--accent2-light);
    --active-alpha: var(--accent2-alpha);
    
    /* テキストカラー */
    --text-color: #e0e0e0;
    --text-light: #aaaaaa;
    --text-lighter: #8a8a8a;
    
    /* 背景と影 */
    --background-color: #121212;
    --card-background: #1a1a1a;
    --shadow-color: rgba(0, 0, 0, 0.2);
    --shadow-hover: rgba(0, 0, 0, 0.3);
}

/* ========== 基本スタイル ========== */
body {
    background-color: var(--background-color);
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
}

.biography-section {
    max-width: 1200px;
    margin: 3rem auto;
    padding: 0;
    background-color: transparent;
    animation: fadeIn 0.8s ease-in-out;
}

/* ========== プロフィールヘッダー ========== */
.profile-header {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: 2.5rem;
    margin-bottom: var(--section-spacing);
    padding: 2.5rem;
    background-color: var(--card-background);
    border-radius: var(--card-radius);
    box-shadow: 0 4px 20px var(--shadow-color);
    transition: transform var(--transition-speed), box-shadow var(--transition-speed);
}

.profile-header:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 30px var(--shadow-hover);
}

/* プロフィール画像 */
.profile-image-container {
    flex-shrink: 0;
    width: 200px;
    height: 200px;
    border-radius: 50%;
    overflow: hidden;
    border: 4px solid var(--primary-light);
    box-shadow: 0 5px 15px var(--shadow-color);
    transition: transform var(--transition-speed), box-shadow var(--transition-speed);
    position: relative;
}

.profile-image-container::after {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: transparent;
    z-index: 1;
}

.profile-image-container:hover {
    transform: scale(1.03);
    box-shadow: 0 8px 25px var(--shadow-hover);
}

.profile-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
    transition: transform 0.5s ease;
    user-select: none;
    pointer-events: none;
    user-drag: none;
    -webkit-user-select: none;
    -khtml-user-select: none;
    -moz-user-select: none;
    -o-user-select: none;
    -webkit-user-drag: none;
    -khtml-user-drag: none;
    -moz-user-drag: none;
    -o-user-drag: none;
}

.profile-image-container:hover .profile-image {
    transform: scale(1.08);
}

/* プロフィール情報 */
.profile-info {
    flex: 1;
    min-width: 300px;
    text-align: left;
}

.profile-name {
    margin: 0 0 0.5rem;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.profile-role {
    margin: 0 0 1rem;
    font-size: 1.2rem;
    color: var(--text-light);
}

.profile-description {
    margin: 0 0 1.5rem;
    font-size: 1rem;
    color: var(--text-lighter);
    line-height: 1.5;
}

/* ========== ソーシャルリンク ========== */
.social-links {
    display: flex;
    flex-wrap: wrap;
    gap: 0.8rem;
    margin-top: 1.5rem;
}

.social-links a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    font-size: 1.2rem;
    color: var(--text-light);
    background-color: var(--primary-alpha);
    border-radius: 50%;
    transition: all var(--transition-speed) ease;
}

.social-links a:hover {
    color: var(--primary-color);
    background-color: var(--primary-light);
    transform: translateY(-3px);
    box-shadow: 0 5px 15px var(--shadow-color);
}

.social-links a.resume-link {
    width: 40px;
    padding: 0;
    border-radius: 50%;
    background-color: var(--primary-alpha);
    color: var(--text-light);
}

.social-links a.resume-link span {
    display: none;
}

.social-links a.resume-link:hover {
    color: var(--primary-color);
    background-color: var(--primary-light);
    transform: translateY(-3px);
    box-shadow: 0 5px 15px var(--shadow-color);
}

/* ========== メインコンテンツ ========== */
.biography-content {
    display: flex;
    flex-direction: column;
    gap: var(--section-spacing);
}

/* ========== セクション共通スタイル ========== */
.skills-section, 
.education-section, 
.experience-section, 
.qualification-section, 
.publication-section, 
.patent-section, 
.externalpost-section {
    padding: 2rem;
    background-color: var(--card-background);
    border-radius: var(--card-radius);
    box-shadow: 0 4px 20px var(--shadow-color);
    transition: transform var(--transition-speed), box-shadow var(--transition-speed);
}

.skills-section:hover, 
.education-section:hover, 
.experience-section:hover, 
.qualification-section:hover, 
.publication-section:hover, 
.patent-section:hover, 
.externalpost-section:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 30px var(--shadow-hover);
}

.skills-section h3, 
.education-section h3, 
.experience-section h3, 
.qualification-section h3, 
.publication-section h3, 
.patent-section h3, 
.externalpost-section h3 {
    display: flex;
    align-items: center;
    margin-top: 0;
    margin-bottom: 1.5rem;
    padding-bottom: 0.75rem;
    font-size: 1.5rem;
    border-bottom: 2px solid var(--primary-alpha);
    color: var(--primary-color);
}

.skills-section h3 i, 
.education-section h3 i, 
.experience-section h3 i, 
.qualification-section h3 i, 
.publication-section h3 i, 
.patent-section h3 i, 
.externalpost-section h3 i {
    margin-right: 0.5rem;
}

/* ========== スキルと教育セクション ========== */
.skills-education-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

/* スキルリスト */
.skills-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.skills-list li {
    margin-bottom: 1.2rem;
}

.skill-info {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.5rem;
    font-size: 0.95rem;
}

.skill-name {
    font-weight: 500;
}

.skill-level {
    color: var(--primary-color);
    font-weight: 600;
}

.skill-bar {
    height: 8px;
    background-color: var(--primary-alpha);
    border-radius: 4px;
    overflow: hidden;
}

.skill-progress {
    height: 100%;
    background-color: var(--primary-color);
    border-radius: 4px;
    transition: width 1s ease-in-out;
}

/* data-percentage属性からwidthを設定 */
.skill-progress[data-percentage="10"] { width: 10%; }
.skill-progress[data-percentage="20"] { width: 20%; }
.skill-progress[data-percentage="30"] { width: 30%; }
.skill-progress[data-percentage="40"] { width: 40%; }
.skill-progress[data-percentage="50"] { width: 50%; }
.skill-progress[data-percentage="60"] { width: 60%; }
.skill-progress[data-percentage="70"] { width: 70%; }
.skill-progress[data-percentage="80"] { width: 80%; }
.skill-progress[data-percentage="90"] { width: 90%; }
.skill-progress[data-percentage="100"] { width: 100%; }

/* 教育リスト */
.education-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.education-list li {
    margin-bottom: 1.5rem;
    padding: 1rem;
    background-color: var(--primary-alpha);
    border-radius: var(--border-radius);
    transition: transform var(--transition-speed), background-color var(--transition-speed);
}

.dark .education-list li {
    background-color: rgba(88, 166, 255, 0.1);
}

.education-list li:hover {
    transform: translateY(-3px);
    background-color: var(--primary-light);
}

.dark .education-list li:hover {
    background-color: rgba(88, 166, 255, 0.2);
}

.education-info {
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
}

.education-course {
    font-weight: 600;
    font-size: 1.1rem;
    color: var(--primary-dark);
}

.education-university {
    font-size: 0.95rem;
}

.education-years {
    font-size: 0.85rem;
    color: var(--text-lighter);
}

.education-years i {
    margin-right: 0.3rem;
}

/* ========== 経験セクション ========== */
.experience-wrapper {
    position: relative;
    padding: 0.5rem 0;
}

.experience-timeline {
    position: relative;
    padding-left: 2rem;
}

.experience-timeline::before {
    content: '';
    position: absolute;
    top: 0;
    bottom: 0;
    left: 6px;
    width: 2px;
    background: linear-gradient(to bottom, 
        transparent,
        var(--primary-color) 15%, 
        var(--secondary-color) 50%,
        var(--primary-color) 85%,
        transparent);
}

.experience-item {
    position: relative;
    margin-bottom: 2rem;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 0.6s ease-out forwards;
}

/* アニメーションディレイ */
.experience-item:nth-child(1) { animation-delay: 0.1s; }
.experience-item:nth-child(2) { animation-delay: 0.2s; }
.experience-item:nth-child(3) { animation-delay: 0.3s; }
.experience-item:nth-child(4) { animation-delay: 0.4s; }
.experience-item:nth-child(5) { animation-delay: 0.5s; }

.timeline-dot {
    position: absolute;
    left: -2rem;
    top: 1.5rem;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background-color: var(--primary-color);
    border: 2px solid var(--card-background);
    z-index: 1;
    transition: transform var(--transition-speed), background-color var(--transition-speed);
}

.experience-item:hover .timeline-dot {
    transform: scale(1.3);
    background-color: var(--accent1-color);
}

.experience-card {
    padding: 1.5rem;
    background-color: var(--primary-alpha);
    border-radius: var(--border-radius);
    transition: transform var(--transition-speed), background-color var(--transition-speed);
    cursor: pointer;
}

.dark .experience-card {
    background-color: rgba(88, 166, 255, 0.1);
}

.experience-card:hover {
    transform: translateX(5px);
    background-color: var(--primary-light);
}

.dark .experience-card:hover {
    background-color: rgba(88, 166, 255, 0.2);
}

.experience-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.experience-logo {
    width: 48px;
    height: 48px;
    object-fit: contain;
    border-radius: 8px;
    background-color: #fff;
    padding: 0.2rem;
    box-shadow: 0 2px 5px var(--shadow-color);
}

.experience-title {
    flex: 1;
}

.experience-title h4 {
    margin: 0 0 0.3rem;
    font-size: 1.1rem;
    color: var(--primary-dark);
}

.experience-role {
    margin: 0;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-light);
}

.experience-meta {
    display: flex;
    justify-content: space-between;
    font-size: 0.85rem;
    color: var(--text-lighter);
}

/* 非表示経験項目の処理 */
.hidden-experience {
    height: 0;
    visibility: hidden;
    opacity: 0;
    overflow: hidden;
    transform: translateY(-10px);
    margin-bottom: 0;
    pointer-events: none;
    position: relative;
    transition: opacity 0.4s ease, transform 0.4s ease, margin-bottom 0.4s ease, height 0.4s ease, visibility 0.1s linear 0.3s;
}

.show-hidden-experiences .hidden-experience {
    height: auto;
    visibility: visible;
    opacity: 1;
    overflow: visible;
    transform: translateY(0);
    margin-bottom: 2rem;
    pointer-events: auto;
    position: relative;
    transition: opacity 0.4s ease, transform 0.4s ease, margin-bottom 0.4s ease, height 0.4s ease, visibility 0s linear;
}

/* もっと見るボタン */
.toggle-card {
    background-color: var(--secondary-alpha);
    cursor: pointer;
    text-align: center;
    transition: background-color 0.3s ease, transform 0.3s ease;
}

.dark .toggle-card {
    background-color: var(--secondary-light);
}

.toggle-card:hover {
    background-color: var(--secondary-light);
    transform: translateY(-3px);
}

.dark .toggle-card:hover {
    background-color: var(--secondary-light);
}

.show-more-text {
    margin: 0;
    font-weight: 500;
    color: var(--secondary-color);
    transition: color 0.3s ease;
}

.dark .show-more-text {
    color: var(--secondary-dark);
}

.show-more-text i {
    transition: transform 0.3s ease;
}

.show-more.last-item {
    margin-left: 2rem;
    transition: all 0.3s ease;
}

.show-more.is-active .toggle-card {
    background-color: var(--secondary-light);
}

.show-more.is-active .show-more-text {
    color: var(--secondary-dark);
}

.show-more.is-active .fa-chevron-down {
    transform: rotate(180deg);
}

/* ========== 資格セクション ========== */
.qualification-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
}

.qualification-card {
    padding: 1.5rem;
    background-color: var(--primary-alpha);
    border-radius: var(--border-radius);
    transition: transform var(--transition-speed), background-color var(--transition-speed);
}

.dark .qualification-card {
    background-color: rgba(88, 166, 255, 0.1);
}

.qualification-card:hover {
    transform: translateY(-5px);
    background-color: var(--primary-light);
}

.dark .qualification-card:hover {
    background-color: rgba(88, 166, 255, 0.2);
}

.qualification-name {
    margin: 0 0 1rem;
    font-size: 1.1rem;
    color: var(--primary-dark);
}

.qualification-name a {
    text-decoration: none;
    color: inherit;
    transition: color var(--transition-speed);
}

.qualification-name a:hover {
    color: var(--accent1-color);
}

.qualification-details {
    font-size: 0.9rem;
}

.qualification-details p {
    margin: 0.5rem 0;
    display: flex;
    align-items: center;
}

.qualification-details i {
    margin-right: 0.5rem;
    color: var(--text-lighter);
    width: 16px;
}

/* アイコンと文字の間隔を調整 */
.qualification-details i,
.experience-duration i, 
.experience-location i,
.education-years i,
.patent-authors i,
.patent-number i, 
.patent-app-number i,
.patent-translation i,
.externalpost-event i {
    margin-right: 0.5rem;
}

/* ========== 出版物セクション ========== */
.publication-list {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.publication-card {
    padding: 1.5rem;
    background-color: var(--primary-alpha);
    border-radius: var(--border-radius);
    transition: transform var(--transition-speed), background-color var(--transition-speed);
}

.dark .publication-card {
    background-color: rgba(88, 166, 255, 0.1);
}

.publication-card:hover {
    transform: translateY(-5px);
    background-color: var(--primary-light);
}

.dark .publication-card:hover {
    background-color: rgba(88, 166, 255, 0.2);
}

.publication-title {
    margin: 0 0 1rem;
    font-size: 1.1rem;
    line-height: 1.4;
}

.publication-title a {
    text-decoration: none;
    color: var(--primary-dark);
    transition: color var(--transition-speed);
}

.publication-title a:hover {
    color: var(--accent1-color);
}

.publication-authors {
    margin-bottom: 1rem;
    font-size: 0.9rem;
    line-height: 1.5;
    position: relative;
}

.author-self {
    color: var(--accent1-color);
}

.equal-author {
    font-weight: 500;
}

.equal-author sup {
    color: var(--accent1-color);
    font-weight: bold;
}

.equal-contrib-badge {
    display: inline-block;
    background-color: var(--accent1-alpha);
    color: var(--accent1-color);
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    font-size: 0.75rem;
    margin-bottom: 0.5rem;
    font-style: italic;
    float: right;
}

.dark .equal-contrib-badge {
    background-color: rgba(255, 193, 7, 0.15);
}

.publication-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    font-size: 0.85rem;
    color: var(--text-lighter);
    justify-content: space-between;
}

.publication-meta i {
    margin-right: 0.5rem;
}

.publication-venue, 
.publication-workshop, 
.publication-date {
    display: flex;
    align-items: center;
    color: var(--text-light);
}

.publication-venue, 
.publication-workshop {
    margin-right: 1rem;
    flex: 1;
}

.publication-date {
    text-align: right;
    white-space: nowrap;
}

/* Conference link specific styling */
.conference-link {
    color: var(--text-color);
    text-decoration: none;
    transition: color var(--transition-speed) ease;
}

.conference-link:hover {
    color: var(--accent1-color);
    text-decoration: none;
}

.publication-workshop a {
    color: var(--secondary-color);
    text-decoration: none;
    transition: color var(--transition-speed) ease;
}

.publication-workshop a:hover {
    color: var(--secondary-dark);
}

/* ========== 特許セクション ========== */
.patent-list {
    display: flex;
    flex-direction: column;
    gap: 1.2rem;
}

.patent-card {
    padding: 1.2rem;
    background-color: var(--primary-alpha);
    border-radius: var(--border-radius);
    transition: transform var(--transition-speed), background-color var(--transition-speed);
}

.dark .patent-card {
    background-color: rgba(88, 166, 255, 0.1);
}

.patent-card:hover {
    transform: translateY(-3px);
    background-color: var(--primary-light);
}

.dark .patent-card:hover {
    background-color: rgba(88, 166, 255, 0.2);
}

.patent-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 0.8rem;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.patent-title {
    margin: 0;
    font-size: 1rem;
    line-height: 1.4;
    flex: 1;
    min-width: 200px;
}

.patent-title a {
    text-decoration: none;
    color: var(--primary-dark);
    transition: color var(--transition-speed);
}

.patent-title a:hover {
    color: var(--accent1-color);
}

.patent-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    font-size: 0.75rem;
    color: var(--text-lighter);
}

.patent-number, 
.patent-app-number {
    display: flex;
    align-items: center;
    background-color: var(--primary-alpha);
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
}

.dark .patent-number, 
.dark .patent-app-number {
    background-color: rgba(88, 166, 255, 0.15);
}

.patent-translation {
    margin-bottom: 0.8rem;
    padding: 0.4rem;
    background-color: var(--accent1-alpha);
    border-radius: 4px;
    font-size: 0.85rem;
    color: var(--accent1-dark);
    display: flex;
    align-items: center;
}

.dark .patent-translation {
    background-color: rgba(255, 193, 7, 0.1);
    color: var(--accent1-color);
}

.patent-authors {
    font-size: 0.85rem;
    line-height: 1.4;
    display: flex;
    align-items: baseline;
    color: var(--text-light);
}

.patent-authors i {
    margin-right: 0.5rem;
    color: var(--text-lighter);
}

/* ========== 外部投稿セクション ========== */
.externalpost-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
}

.externalpost-card {
    height: 100%;
    padding: 1.5rem;
    background-color: var(--primary-alpha);
    border-radius: var(--border-radius);
    transition: transform var(--transition-speed), background-color var(--transition-speed);
    display: flex;
    flex-direction: column;
}

.dark .externalpost-card {
    background-color: rgba(88, 166, 255, 0.1);
}

.externalpost-card:hover {
    transform: translateY(-5px);
    background-color: var(--primary-light);
}

.dark .externalpost-card:hover {
    background-color: rgba(88, 166, 255, 0.2);
}

.externalpost-title {
    margin: 0 0 auto;
    font-size: 1.1rem;
    line-height: 1.4;
}

.externalpost-title a {
    text-decoration: none;
    color: var(--primary-dark);
    transition: color var(--transition-speed);
}

.externalpost-title a:hover {
    color: var(--accent1-color);
}

.externalpost-event {
    margin-top: 1rem;
    font-size: 0.85rem;
    color: var(--text-color);
    display: flex;
    align-items: baseline;
}

.externalpost-event a {
    color: var(--text-color);
    text-decoration: none;
    transition: color var(--transition-speed);
}

.externalpost-event a:hover {
    color: var(--accent1-color);
}

/* ========== アニメーション ========== */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes fadeInUp {
    from { 
        opacity: 0;
        transform: translateY(20px);
    }
    to { 
        opacity: 1;
        transform: translateY(0);
    }
}

/* ========== アクティブアイテムのスタイル ========== */
.active-item .experience-card {
    border-left: 4px solid var(--active-color);
    background-color: var(--active-light);
}

.dark .active-item .experience-card {
    background-color: rgba(62, 188, 92, 0.15);
}

.active-item .timeline-dot {
    background-color: var(--active-color);
    border-color: var(--active-light);
    box-shadow: 0 0 0 4px var(--active-alpha);
}

.dark .active-item .timeline-dot {
    border-color: #1a1a1a;
}

.active-item .experience-header h4 {
    color: var(--active-color);
}

/* ========== プロジェクト詳細セクション ========== */
.project-details {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.5s ease;
    opacity: 0;
    margin-top: 0;
    padding: 0 10px;
}

.project-details.expanded {
    max-height: 1000px;
    opacity: 1;
    margin-top: 15px;
    padding: 10px;
    border-top: 1px dashed var(--text-lighter);
}

.dark .project-details.expanded {
    border-top: 1px dashed rgba(138, 138, 138, 0.5);
}

.project-title {
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 5px;
    font-size: 0.95rem;
}

.project-description {
    font-size: 0.9rem;
    color: var(--text-color);
    margin-bottom: 10px;
}

.expand-button {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background-color: var(--primary-alpha);
    color: var(--primary-color);
    margin-left: auto;
    transition: transform 0.3s ease, background-color 0.3s ease;
}

.dark .expand-button {
    background-color: rgba(88, 166, 255, 0.15);
}

.expand-button i {
    font-size: 12px;
    transition: transform 0.3s ease;
}

.expanded .expand-button i {
    transform: rotate(180deg);
}

.publication-equal-contrib {
    margin-top: 0.25rem;
    margin-bottom: 0.75rem;
    font-size: 0.8rem;
    color: var(--text-lighter);
    font-style: italic;
}

.publication-equal-contrib sup {
    color: var(--accent1-color);
    font-weight: bold;
}

/* ========== レスポンシブデザイン ========== */
@media (max-width: 768px) {
    .biography-section {
        margin: 1.5rem auto;
    }
    
    .profile-header {
        flex-direction: column;
        text-align: center;
        padding: 1.5rem;
    }
    
    .profile-info {
        text-align: center;
    }
    
    .social-links {
        justify-content: center;
    }
    
    .skills-education-grid, 
    .qualification-grid, 
    .externalpost-grid {
        grid-template-columns: 1fr;
    }
    
    .experience-timeline {
        padding-left: 1.5rem;
    }
    
    .timeline-dot {
        left: -1.5rem;
    }
}

@media (max-width: 480px) {
    .profile-image-container {
        width: 150px;
        height: 150px;
    }
    
    .profile-name {
        font-size: 2rem;
    }
    
    .skills-section, 
    .education-section, 
    .experience-section, 
    .qualification-section, 
    .publication-section, 
    .patent-section, 
    .externalpost-section {
        padding: 1.2rem;
    }
    
    .experience-meta {
        flex-direction: column;
        gap: 0.5rem;
    }
}