/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
header {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(10, 10, 10, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    padding: 1rem 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.logo .name-link {
    font-size: 1.8rem;
    font-weight: bold;
    color: #4a9eff;
    text-decoration: none;
    transition: all 0.3s ease;
}

.logo .name-link:hover {
    color: #66b3ff;
    text-shadow: 0 0 10px rgba(74, 158, 255, 0.5);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-link {
    color: #e8e8e8;
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    transition: all 0.3s ease;
    position: relative;
}

.nav-link:hover {
    color: #4a9eff;
    background: rgba(74, 158, 255, 0.1);
    transform: translateY(-2px);
}

.nav-link.active {
    color: #ffffff;
    background: linear-gradient(135deg, #4a9eff, #66b3ff);
    box-shadow: 0 4px 15px rgba(74, 158, 255, 0.3);
    transform: translateY(-1px);
    position: relative;
    padding-left: 1.5rem;
}

.nav-link.active::before {
    content: '●';
    position: absolute;
    left: 0.3rem;
    top: 50%;
    transform: translateY(-50%);
    color: #ffffff;
    font-size: 0.6rem;
    opacity: 0.8;
}

.nav-link::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: -5px;
    left: 50%;
    background: #4a9eff;
    transition: all 0.3s ease;
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
    left: 0;
}

.nav-link.active::after {
    background: #ffffff;
}

.nav-link.active:hover {
    color: #ffffff;
    background: linear-gradient(135deg, #66b3ff, #4a9eff);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(74, 158, 255, 0.4);
}

.lang-btn {
    background: rgba(74, 158, 255, 0.2);
    color: #4a9eff;
    border: 1px solid #4a9eff;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 0.9rem;
}

.lang-btn:hover {
    background: #4a9eff;
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(74, 158, 255, 0.3);
}

/* Profile Image */
.profile-image {
    margin-bottom: 2rem;
}

.profile-image img {
    width: 150px;
    height: 150px;
    border-radius: 50%;
    border: 3px solid #4a9eff;
    box-shadow: 0 0 30px rgba(74, 158, 255, 0.3);
    transition: all 0.3s ease;
}

.profile-image img:hover {
    transform: scale(1.05);
    box-shadow: 0 0 40px rgba(74, 158, 255, 0.5);
}

/* Social Links */
.social-links {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin-top: 2rem;
}

.social-link {
    display: inline-block;
    width: 50px;
    height: 50px;
    background: rgba(74, 158, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #4a9eff;
    font-size: 1.2rem;
    text-decoration: none;
    transition: all 0.3s ease;
    border: 1px solid rgba(74, 158, 255, 0.3);
}

.social-link:hover {
    background: #4a9eff;
    color: white;
    transform: translateY(-5px) scale(1.1);
    box-shadow: 0 10px 25px rgba(74, 158, 255, 0.4);
}

/* Custom Tooltip Styles */
.social-link {
    position: relative;
}

.social-link::after {
    content: attr(title);
    position: absolute;
    bottom: -40px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(0, 0, 0, 0.9);
    color: white;
    padding: 0.5rem 0.8rem;
    border-radius: 6px;
    font-size: 0.8rem;
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 1000;
    pointer-events: none;
}

.social-link::before {
    content: '';
    position: absolute;
    bottom: -34px;
    left: 50%;
    transform: translateX(-50%);
    border-left: 5px solid transparent;
    border-right: 5px solid transparent;
    border-bottom: 5px solid rgba(0, 0, 0, 0.9);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 1000;
    pointer-events: none;
}

.social-link:hover::after,
.social-link:hover::before {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(-5px);
}

/* Email Contact */
.email-contact {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    margin-top: 2rem;
    padding: 0.75rem 1.5rem;
    background: rgba(74, 158, 255, 0.05);
    border-radius: 25px;
    border: 1px solid rgba(74, 158, 255, 0.2);
    max-width: fit-content;
    margin-left: auto;
    margin-right: auto;
    transition: all 0.3s ease;
}

.email-contact:hover {
    background: rgba(74, 158, 255, 0.1);
    border-color: rgba(74, 158, 255, 0.4);
    transform: translateY(-2px);
}

.email-contact i {
    color: #4a9eff;
    font-size: 1.1rem;
}

.email-contact a {
    color: #b8b8b8;
    text-decoration: none;
    font-size: 0.95rem;
    transition: color 0.3s ease;
}

.email-contact a:hover {
    color: #4a9eff;
}

/* Page Hero */
.page-hero {
    padding: 6rem 0 4rem;
    text-align: center;
    background: linear-gradient(135deg, rgba(74, 158, 255, 0.1), rgba(128, 204, 255, 0.05));
}

.page-hero h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: #4a9eff;
}

.page-hero p {
    font-size: 1.1rem;
    color: #b8b8b8;
}

/* Overview Section */
.overview {
    padding: 6rem 0;
}

.overview-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.overview-card {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 15px;
    padding: 2rem;
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
}

.overview-card:hover {
    transform: translateY(-10px);
    background: rgba(255, 255, 255, 0.08);
    box-shadow: 0 20px 40px rgba(74, 158, 255, 0.1);
}

.overview-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: #4a9eff;
}

.overview-card p {
    color: #b8b8b8;
    margin-bottom: 1.5rem;
}

.project-list, .blog-list {
    margin-bottom: 1.5rem;
}

.project-item, .blog-item {
    padding: 1rem 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.project-item:last-child, .blog-item:last-child {
    border-bottom: none;
}

.project-item h4, .blog-item h4 {
    color: #e8e8e8;
    margin-bottom: 0.5rem;
    font-size: 1rem;
}

.project-item p, .blog-item p {
    color: #999;
    font-size: 0.9rem;
}

.card-link {
    display: inline-block;
    color: #4a9eff;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
}

.card-link:hover {
    color: #66b3ff;
    text-shadow: 0 0 5px rgba(74, 158, 255, 0.5);
}

/* About Summary Styles for Home Page */
.about-summary {
    margin-bottom: 1.5rem;
}

.about-bio {
    color: #b8b8b8;
    line-height: 1.6;
    margin-bottom: 1.5rem;
    font-size: 0.95rem;
}

.skills-summary {
    margin-bottom: 1.5rem;
}

.skills-summary h4 {
    color: #e8e8e8;
    font-size: 1rem;
    margin-bottom: 0.75rem;
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.skill-tag {
    padding: 0.4rem 0.9rem;
    background: linear-gradient(135deg, #a8d5ff 0%, #7fb3ff 100%);
    color: #2563eb;
    border: none;
    border-radius: 12px;
    font-size: 0.85rem;
    font-weight: 500;
    box-shadow: 0 2px 4px rgba(37, 99, 235, 0.15);
    transition: all 0.3s ease;
}

.skill-tag:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(37, 99, 235, 0.25);
}

.github-summary h4 {
    color: #e8e8e8;
    font-size: 1rem;
    margin-bottom: 0.75rem;
}

.github-stats-mini {
    display: flex;
    gap: 1.5rem;
}

.github-stats-mini .stat-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.github-stats-mini .stat-item i {
    color: #4a9eff;
    font-size: 1.1rem;
}

.github-stats-mini .stat-value {
    color: #e8e8e8;
    font-size: 1.2rem;
    font-weight: 600;
}

.github-stats-mini .stat-label {
    color: #999;
    font-size: 0.85rem;
    margin-left: 0.25rem;
}

/* GitHub Stats Vertical Layout for Home Page */
.github-stats-mini-vertical {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.github-stats-mini-vertical .stat-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.github-stats-mini-vertical .stat-item i {
    color: #4a9eff;
    font-size: 1.2rem;
    width: 24px;
    text-align: center;
}

.github-stats-mini-vertical .stat-label {
    color: #999;
    font-size: 0.9rem;
    flex: 1;
}

.github-stats-mini-vertical .stat-value {
    color: #e8e8e8;
    font-size: 1.2rem;
    font-weight: 600;
}

/* About List Styles for Home Page */
.about-list {
    margin-bottom: 2rem;
}

.about-item {
    padding: 1.5rem 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.about-item:first-child {
    padding-top: 0;
}

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

.about-item h4 {
    color: #e8e8e8;
    margin-bottom: 0.75rem;
    font-size: 1rem;
    font-weight: 600;
}

.about-item p {
    color: #b8b8b8;
    line-height: 1.6;
    font-size: 0.95rem;
    margin: 0;
}

/* About Page Specific */
.about-content {
    padding: 4rem 0;
}

.about-grid {
    display: grid;
    gap: 3rem;
    max-width: 900px;
    margin: 0 auto;
}

.profile-section {
    display: flex;
    gap: 2rem;
    align-items: center;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 15px;
    padding: 2rem;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.profile-section .profile-image img {
    width: 200px;
    height: 200px;
}

.profile-info h2 {
    color: #4a9eff;
    margin-bottom: 0.5rem;
}

.role {
    color: #b8b8b8;
    margin-bottom: 1rem;
}

.bio-section, .skills-section, .certifications-section, .achievements-section, .education-section {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 15px;
    padding: 2rem;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.bio-section h3, .skills-section h3, .certifications-section h3, .achievements-section h3, .education-section h3 {
    color: #4a9eff;
    margin-bottom: 1.5rem;
    font-size: 1.3rem;
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.skill-category h4 {
    color: #e8e8e8;
    margin-bottom: 1rem;
}

.skill-category ul {
    list-style: none;
}

.skill-category li {
    color: #b8b8b8;
    padding: 0.3rem 0;
    position: relative;
    padding-left: 1rem;
}

.skill-category li::before {
    content: '▸';
    color: #4a9eff;
    position: absolute;
    left: 0;
}

/* Certifications Section */
.certifications-list {
    display: flex;
    flex-direction: column;
    gap: 1.2rem;
}

.certification-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    padding: 1rem;
    background: rgba(255, 255, 255, 0.03);
    border-radius: 10px;
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: all 0.3s ease;
}

.certification-item:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(74, 158, 255, 0.3);
    transform: translateX(5px);
}

.cert-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    min-width: 40px;
    background: rgba(74, 158, 255, 0.1);
    border-radius: 8px;
    color: #4a9eff;
    font-size: 1.2rem;
}

.cert-details {
    flex: 1;
}

.cert-details h4 {
    color: #e8e8e8;
    margin: 0 0 0.3rem 0;
    font-size: 1.05rem;
    font-weight: 600;
}

.cert-meta {
    color: #888;
    font-size: 0.9rem;
    margin: 0;
}

.achievements-list {
    display: grid;
    gap: 1.5rem;
}

.achievement-item {
    background: rgba(255, 255, 255, 0.03);
    border-radius: 10px;
    padding: 1.5rem;
    border-left: 3px solid #4a9eff;
}

.achievement-item h4 {
    color: #4a9eff;
    margin-bottom: 0.5rem;
}

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

.timeline::before {
    content: '';
    position: absolute;
    left: 1rem;
    top: 0;
    bottom: 0;
    width: 2px;
    background: #4a9eff;
}

.timeline-item {
    position: relative;
    margin-bottom: 2rem;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -2.5rem;
    top: 0;
    width: 10px;
    height: 10px;
    background: #4a9eff;
    border-radius: 50%;
}

.timeline-date {
    color: #4a9eff;
    font-weight: bold;
    margin-bottom: 0.5rem;
}

.timeline-content h4 {
    color: #e8e8e8;
    margin-bottom: 0.5rem;
}

/* Projects Page */
.projects-content {
    padding: 4rem 0;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 2rem;
}

.project-card {
    background: rgba(26, 26, 26, 0.8);
    border: 1px solid #333;
    border-radius: 16px;
    overflow: hidden;
    transition: all 0.3s ease;
    height: 100%;
    display: flex;
    flex-direction: column;
}

.project-card:hover {
    transform: translateY(-5px);
    border-color: #4a9eff;
    box-shadow: 0 12px 35px rgba(74, 158, 255, 0.2);
}

.project-card.featured {
    grid-column: span 2;
}

.project-image {
    position: relative;
    width: 100%;
    height: 200px;
    overflow: hidden;
}

.project-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.project-card:hover .project-image img {
    transform: scale(1.05);
}

.project-content {
    padding: 1.5rem;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.project-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1rem;
}

.project-title {
    color: #e8e8e8;
    font-size: 1.25rem;
    font-weight: 600;
    margin: 0;
    flex: 1;
}

.project-stats {
    display: flex;
    align-items: center;
    margin-left: 1rem;
}

.star-count {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: #ffd700;
    font-size: 1rem;
    font-weight: 500;
    padding: 0.4rem 0.7rem;
    background: rgba(255, 215, 0, 0.1);
    border-radius: 12px;
    border: 1px solid rgba(255, 215, 0, 0.2);
}

.star-count i {
    font-size: 1rem;
}

.star-number {
    color: #ffd700;
    font-weight: 600;
}

.project-description {
    color: #b8b8b8;
    line-height: 1.6;
    margin-bottom: 1.5rem;
    flex: 1;
}

.project-info {
    padding: 2rem;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.tag {
    background: rgba(74, 158, 255, 0.2);
    color: #4a9eff;
    padding: 0.3rem 0.8rem;
    border-radius: 15px;
    font-size: 0.8rem;
    border: 1px solid rgba(74, 158, 255, 0.3);
    font-weight: 500;
}

/* プロジェクトタグの色分け */
.tag.tag-python {
    background: rgba(255, 193, 7, 0.2);
    color: #ffc107;
    border-color: rgba(255, 193, 7, 0.3);
}

.tag.tag-javascript {
    background: rgba(240, 219, 79, 0.2);
    color: #f0db4f;
    border-color: rgba(240, 219, 79, 0.3);
}

.tag.tag-react {
    background: rgba(97, 218, 251, 0.2);
    color: #61dafb;
    border-color: rgba(97, 218, 251, 0.3);
}

.tag.tag-nodejs {
    background: rgba(76, 175, 80, 0.2);
    color: #4caf50;
    border-color: rgba(76, 175, 80, 0.3);
}

.tag.tag-tensorflow {
    background: rgba(255, 152, 0, 0.2);
    color: #ff9800;
    border-color: rgba(255, 152, 0, 0.3);
}

.tag.tag-pytorch {
    background: rgba(238, 88, 37, 0.2);
    color: #ee5825;
    border-color: rgba(238, 88, 37, 0.3);
}

.tag.tag-fastapi {
    background: rgba(0, 150, 136, 0.2);
    color: #009688;
    border-color: rgba(0, 150, 136, 0.3);
}

.tag.tag-aws {
    background: rgba(255, 152, 0, 0.2);
    color: #ff9800;
    border-color: rgba(255, 152, 0, 0.3);
}

.tag.tag-docker {
    background: rgba(33, 150, 243, 0.2);
    color: #2196f3;
    border-color: rgba(33, 150, 243, 0.3);
}

.tag.tag-firebase {
    background: rgba(255, 193, 7, 0.2);
    color: #ffc107;
    border-color: rgba(255, 193, 7, 0.3);
}

.tag.tag-opencv {
    background: rgba(76, 175, 80, 0.2);
    color: #4caf50;
    border-color: rgba(76, 175, 80, 0.3);
}

.tag.tag-d3js {
    background: rgba(255, 152, 0, 0.2);
    color: #ff9800;
    border-color: rgba(255, 152, 0, 0.3);
}

.tag.tag-html5canvas {
    background: rgba(255, 87, 34, 0.2);
    color: #ff5722;
    border-color: rgba(255, 87, 34, 0.3);
}

.tag.tag-expo {
    background: rgba(33, 150, 243, 0.2);
    color: #2196f3;
    border-color: rgba(33, 150, 243, 0.3);
}

.tag.tag-reactnative {
    background: rgba(97, 218, 251, 0.2);
    color: #61dafb;
    border-color: rgba(97, 218, 251, 0.3);
}

.tag.tag-postgresql {
    background: rgba(51, 103, 145, 0.2);
    color: #336791;
    border-color: rgba(51, 103, 145, 0.3);
}

.tag.tag-pandas {
    background: rgba(150, 208, 255, 0.2);
    color: #150458;
    border-color: rgba(150, 208, 255, 0.3);
}

.tag.tag-matplotlib {
    background: rgba(17, 17, 17, 0.2);
    color: #11557c;
    border-color: rgba(17, 17, 17, 0.3);
}

.tag.tag-jupyter {
    background: rgba(247, 119, 34, 0.2);
    color: #f77722;
    border-color: rgba(247, 119, 34, 0.3);
}

.project-tag {
    padding: 0.3rem 0.8rem;
    background: rgba(74, 158, 255, 0.1);
    color: #4a9eff;
    border: 1px solid rgba(74, 158, 255, 0.2);
    border-radius: 12px;
    font-size: 0.8rem;
    font-weight: 500;
    transition: all 0.3s ease;
}

.project-tag:hover {
    background: rgba(74, 158, 255, 0.2);
    border-color: rgba(74, 158, 255, 0.4);
}

/* 2420行あたりはデッドコード */
/* 以下はプロジェクトとブログの両方で使われている */

/* Project Tag Colors - Vibrant Pastels */
/* TODO: 色が適切か見直し */

/* ==== Programming ==== */
.project-tag.tag-python { background: linear-gradient(135deg, #a8d5ff 0%, #7fb3ff 100%); color: #2563eb; border: none; box-shadow: 0 2px 4px rgba(37, 99, 235, 0.15); }
.project-tag.tag-javascript { background: linear-gradient(135deg, #fff7a8 0%, #ffed4e 100%); color: #d97706; border: none; box-shadow: 0 2px 4px rgba(217, 119, 6, 0.15); }
.project-tag.tag-cpp { background: linear-gradient(135deg, #bfdbfe 0%, #93c5fd 100%); color: #1e40af; border: none; box-shadow: 0 2px 4px rgba(30, 64, 175, 0.15); }

/* ==== AI / Machine Learning / Data Science ==== */
.project-tag.tag-ai { background: linear-gradient(135deg, #fed7aa 0%, #fdba74 100%); color: #c2410c; border: none; box-shadow: 0 2px 4px rgba(194, 65, 12, 0.15); }
.project-tag.tag-ml { background: linear-gradient(135deg, #fecaca 0%, #fca5a5 100%); color: #dc2626; border: none; box-shadow: 0 2px 4px rgba(220, 38, 38, 0.15); }
.project-tag.tag-deep-learning { background: linear-gradient(135deg, #ddd6fe 0%, #c4b5fd 100%); color: #6b21a8; border: none; box-shadow: 0 2px 4px rgba(107, 33, 168, 0.15); }
.project-tag.tag-nlp { background: linear-gradient(135deg, #fecaca 0%, #fca5a5 100%); color: #dc2626; border: none; box-shadow: 0 2px 4px rgba(220, 38, 38, 0.15); }
.project-tag.tag-kaggle { background: linear-gradient(135deg, #a5f3fc 0%, #67e8f9 100%); color: #0e7490; border: none; box-shadow: 0 2px 4px rgba(14, 116, 144, 0.15); }
.project-tag.tag-transformer { background: linear-gradient(135deg, #fed7aa 0%, #fdba74 100%); color: #ea580c; border: none; box-shadow: 0 2px 4px rgba(234, 88, 12, 0.15); }
.project-tag.tag-tensorflow { background: linear-gradient(135deg, #fed7aa 0%, #fdba74 100%); color: #c2410c; border: none; box-shadow: 0 2px 4px rgba(194, 65, 12, 0.15); }
.project-tag.tag-datascience { background: linear-gradient(135deg, #bfdbfe 0%, #93c5fd 100%); color: #1d4ed8; border: none; box-shadow: 0 2px 4px rgba(29, 78, 216, 0.15); }
.project-tag.tag-openai { background: linear-gradient(135deg, #a7f3d0 0%, #6ee7b7 100%); color: #047857; border: none; box-shadow: 0 2px 4px rgba(4, 120, 87, 0.15); }

/* ==== Computer Science / Algorithm ==== */
.project-tag.tag-algorithm { background: linear-gradient(135deg, #ddd6fe 0%, #c4b5fd 100%); color: #6b21a8; border: none; box-shadow: 0 2px 4px rgba(107, 33, 168, 0.15); }
.project-tag.tag-graph-theory { background: linear-gradient(135deg, #c7d2fe 0%, #a5b4fc 100%); color: #4338ca; border: none; box-shadow: 0 2px 4px rgba(67, 56, 202, 0.15); }
.project-tag.tag-computer-science { background: linear-gradient(135deg, #bfdbfe 0%, #93c5fd 100%); color: #1e40af; border: none; box-shadow: 0 2px 4px rgba(30, 64, 175, 0.15); }
.project-tag.tag-data-structures { background: linear-gradient(135deg, #d8b4fe 0%, #c084fc 100%); color: #7e22ce; border: none; box-shadow: 0 2px 4px rgba(126, 34, 206, 0.15); }
.project-tag.tag-atcoder { background: linear-gradient(135deg, #d4d4d8 0%, #a1a1aa 100%); color: #27272a; border: none; box-shadow: 0 2px 4px rgba(39, 39, 42, 0.15); }

/* ==== 3D / Graphics ==== */
.project-tag.tag-blender { background: linear-gradient(135deg, #fed7aa 0%, #fdba74 100%); color: #c2410c; border: none; box-shadow: 0 2px 4px rgba(194, 65, 12, 0.15); }
.project-tag.tag-unity { background: linear-gradient(135deg, #d4d4d8 0%, #a1a1aa 100%); color: #27272a; border: none; box-shadow: 0 2px 4px rgba(39, 39, 42, 0.15); }
.project-tag.tag-3d-modeling { background: linear-gradient(135deg, #fecaca 0%, #fca5a5 100%); color: #dc2626; border: none; box-shadow: 0 2px 4px rgba(220, 38, 38, 0.15); }
.project-tag.tag-vrm { background: linear-gradient(135deg, #99f6e4 0%, #5eead4 100%); color: #0f766e; border: none; box-shadow: 0 2px 4px rgba(15, 118, 110, 0.15); }

/* ==== Creative / Character / Animation ==== */
.project-tag.tag-aituber { background: linear-gradient(135deg, #ffc9e0 0%, #ff8fb3 100%); color: #be185d; border: none; box-shadow: 0 2px 4px rgba(190, 24, 93, 0.15); }
.project-tag.tag-animation { background: linear-gradient(135deg, #d8b4fe 0%, #c084fc 100%); color: #7e22ce; border: none; box-shadow: 0 2px 4px rgba(126, 34, 206, 0.15); }
.project-tag.tag-character-design { background: linear-gradient(135deg, #f9c5ff 0%, #f08fff 100%); color: #a21caf; border: none; box-shadow: 0 2px 4px rgba(162, 28, 175, 0.15); }

/* ==== Web Frontend ==== */
.project-tag.tag-react { background: linear-gradient(135deg, #b3f0ff 0%, #61dafb 100%); color: #0369a1; border: none; box-shadow: 0 2px 4px rgba(3, 105, 161, 0.15); }
.project-tag.tag-webgl { background: linear-gradient(135deg, #ffc9e0 0%, #ff8fb3 100%); color: #be185d; border: none; box-shadow: 0 2px 4px rgba(190, 24, 93, 0.15); }
.project-tag.tag-threejs { background: linear-gradient(135deg, #a7f3d0 0%, #6ee7b7 100%); color: #047857; border: none; box-shadow: 0 2px 4px rgba(4, 120, 87, 0.15); }
.project-tag.tag-html { background: linear-gradient(135deg, #fed7aa 0%, #fdba74 100%); color: #ea580c; border: none; box-shadow: 0 2px 4px rgba(234, 88, 12, 0.15); }

/* ==== Web Backend ==== */
.project-tag.tag-backend { background: linear-gradient(135deg, #99f6e4 0%, #5eead4 100%); color: #0f766e; border: none; box-shadow: 0 2px 4px rgba(15, 118, 110, 0.15); }
.project-tag.tag-nodejs { background: linear-gradient(135deg, #b3f0ff 0%, #61dafb 100%); color: #0369a1; border: none; box-shadow: 0 2px 4px rgba(3, 105, 161, 0.15); }
.project-tag.tag-rest-api { background: linear-gradient(135deg, #a5f3fc 0%, #67e8f9 100%); color: #0e7490; border: none; box-shadow: 0 2px 4px rgba(14, 116, 144, 0.15); }
.project-tag.tag-fastapi { background: linear-gradient(135deg, #99f6e4 0%, #5eead4 100%); color: #0f766e; border: none; box-shadow: 0 2px 4px rgba(15, 118, 110, 0.15); }
.project-tag.tag-web-dev { background: linear-gradient(135deg, #bfdbfe 0%, #93c5fd 100%); color: #1d4ed8; border: none; box-shadow: 0 2px 4px rgba(29, 78, 216, 0.15); }

/* ==== Others ==== */
.project-tag.tag-tool-development { background: linear-gradient(135deg, #d4d4d8 0%, #a1a1aa 100%); color: #18181b; border: none; box-shadow: 0 2px 4px rgba(24, 24, 27, 0.15); }
.project-tag.tag-software-dev { background: linear-gradient(135deg, #a7f3d0 0%, #6ee7b7 100%); color: #059669; border: none; box-shadow: 0 2px 4px rgba(5, 150, 105, 0.15); }

.project-info h3 {
    color: #4a9eff;
    margin-bottom: 1rem;
    font-size: 1.3rem;
}

.project-info p {
    color: #b8b8b8;
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.project-links {
    display: flex;
    gap: 1rem;
    margin-top: auto;
}

.project-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
    background: rgba(74, 158, 255, 0.1);
    color: #4a9eff;
    text-decoration: none;
    border: 1px solid rgba(74, 158, 255, 0.2);
    border-radius: 8px;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.3s ease;
}

.project-link:hover {
    background: rgba(74, 158, 255, 0.2);
    border-color: rgba(74, 158, 255, 0.4);
    transform: translateY(-2px);
}

.project-link i {
    font-size: 1rem;
}

/* Search and Filter Styles */
.projects-filters {
    margin-bottom: 3rem;
}

.blog-search-container {
    margin-bottom: 2rem;
}

.search-container {
    position: relative;
    max-width: 400px;
    margin: 0 auto;
}

.search-container input {
    width: 100%;
    padding: 1rem 1rem 1rem 3rem;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 25px;
    color: #e8e8e8;
    font-size: 1rem;
    transition: all 0.3s ease;
}

.search-container input:focus {
    outline: none;
    border-color: #4a9eff;
    background: rgba(255, 255, 255, 0.08);
    box-shadow: 0 0 15px rgba(74, 158, 255, 0.2);
}

.search-container input::placeholder {
    color: #999;
}

.search-icon {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: #999;
    font-size: 1rem;
}

.tag-filters {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-top: 2rem;
    flex-wrap: wrap;
}

.tag-filter-btn {
    background: rgba(255, 255, 255, 0.05);
    color: #b8b8b8;
    border: 1px solid rgba(255, 255, 255, 0.1);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 0.9rem;
    display: inline-block;
    min-width: 60px;
    text-align: center;
    user-select: none;
    position: relative;
    z-index: 1;
}

.tag-filter-btn:hover,
.tag-filter-btn.active {
    background: #4a9eff;
    color: white;
    border-color: #4a9eff;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(74, 158, 255, 0.3);
}

.tag-filter-btn::before {
    content: '';
    position: absolute;
    top: -10px;
    left: -10px;
    right: -10px;
    bottom: -10px;
    border-radius: 30px;
    z-index: 0;
    pointer-events: all;
    cursor: pointer;
}

/* Blog Page */
.blog-content {
    padding: 4rem 0;
}

.blog-filters {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 3rem;
    flex-wrap: wrap;
}

.filter-btn {
    background: rgba(255, 255, 255, 0.05);
    color: #b8b8b8;
    border: 1px solid rgba(255, 255, 255, 0.1);
    padding: 0.7rem 1.5rem;
    border-radius: 25px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-block;
    min-width: 80px;
    text-align: center;
    user-select: none;
    position: relative;
    z-index: 1;
}

.filter-btn:hover,
.filter-btn.active {
    background: #4a9eff;
    color: white;
    border-color: #4a9eff;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(74, 158, 255, 0.3);
}

/* フィルターボタンの色分け */
.filter-btn[data-category="ai"]:hover,
.filter-btn[data-category="ai"].active {
    background: #ff6b6b;
    border-color: #ff6b6b;
    box-shadow: 0 5px 15px rgba(255, 107, 107, 0.3);
}

.filter-btn[data-category="web"]:hover,
.filter-btn[data-category="web"].active {
    background: #4a9eff;
    border-color: #4a9eff;
    box-shadow: 0 5px 15px rgba(74, 158, 255, 0.3);
}

.filter-btn[data-category="algorithm"]:hover,
.filter-btn[data-category="algorithm"].active {
    background: #4caf50;
    border-color: #4caf50;
    box-shadow: 0 5px 15px rgba(76, 175, 80, 0.3);
}

.filter-btn[data-category="learning"]:hover,
.filter-btn[data-category="learning"].active {
    background: #ffc107;
    border-color: #ffc107;
    box-shadow: 0 5px 15px rgba(255, 193, 7, 0.3);
    color: #333;
}

.filter-btn[data-category="tips"]:hover,
.filter-btn[data-category="tips"].active {
    background: #9c27b0;
    border-color: #9c27b0;
    box-shadow: 0 5px 15px rgba(156, 39, 176, 0.3);
}

.filter-btn[data-category="tutorial"]:hover,
.filter-btn[data-category="tutorial"].active {
    background: #ff9800;
    border-color: #ff9800;
    box-shadow: 0 5px 15px rgba(255, 152, 0, 0.3);
}

.filter-btn::before {
    content: '';
    position: absolute;
    top: -10px;
    left: -10px;
    right: -10px;
    bottom: -10px;
    border-radius: 35px;
    z-index: 0;
    pointer-events: all;
    cursor: pointer;
}

.blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 2rem;
}

.blog-card {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 15px;
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: all 0.3s ease;
}

.blog-card:hover {
    transform: translateY(-10px);
    background: rgba(255, 255, 255, 0.08);
    box-shadow: 0 20px 40px rgba(74, 158, 255, 0.1);
}

.blog-image img {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.blog-info {
    padding: 2rem;
}

/* Legacy blog-meta for backward compatibility */
.blog-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    flex-wrap: wrap;
    gap: 0.5rem;
}

/* New blog layout styles */
.blog-meta-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
}

.blog-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.blog-date {
    color: #999;
    font-size: 0.9rem;
}

.blog-category {
    padding: 0.3rem 0.8rem;
    border-radius: 15px;
    font-size: 0.8rem;
    border: 1px solid;
    font-weight: 500;
}

/* ブログカテゴリの色分け */
.blog-card[data-category="ai"] .blog-category {
    background: rgba(255, 107, 107, 0.2);
    color: #ff6b6b;
    border-color: rgba(255, 107, 107, 0.3);
}

.blog-card[data-category="web"] .blog-category {
    background: rgba(74, 158, 255, 0.2);
    color: #4a9eff;
    border-color: rgba(74, 158, 255, 0.3);
}

.blog-card[data-category="algorithm"] .blog-category {
    background: rgba(76, 175, 80, 0.2);
    color: #4caf50;
    border-color: rgba(76, 175, 80, 0.3);
}

.blog-card[data-category="learning"] .blog-category {
    background: rgba(255, 193, 7, 0.2);
    color: #ffc107;
    border-color: rgba(255, 193, 7, 0.3);
}

.blog-card[data-category="tips"] .blog-category {
    background: rgba(156, 39, 176, 0.2);
    color: #9c27b0;
    border-color: rgba(156, 39, 176, 0.3);
}

.blog-card[data-category="tutorial"] .blog-category {
    background: rgba(255, 152, 0, 0.2);
    color: #ff9800;
    border-color: rgba(255, 152, 0, 0.3);
}

.blog-category.ai {
    background: rgba(74, 158, 255, 0.2);
    color: #4a9eff;
    border-color: rgba(74, 158, 255, 0.3);
}

.blog-category.web {
    background: rgba(97, 218, 251, 0.2);
    color: #61dafb;
    border-color: rgba(97, 218, 251, 0.3);
}

.blog-category.algorithm {
    background: rgba(155, 89, 182, 0.2);
    color: #9b59b6;
    border-color: rgba(155, 89, 182, 0.3);
}

.blog-category.self-developed {
    background: rgba(155, 89, 182, 0.2);
    color: #9b59b6;
    border-color: rgba(155, 89, 182, 0.3);
}

.blog-category.blender {
    background: rgba(155, 89, 182, 0.2);
    color: #9b59b6;
    border-color: rgba(155, 89, 182, 0.3);
}

.blog-info h3 {
    color: #e8e8e8;
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

.blog-info p {
    color: #b8b8b8;
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.blog-links {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.blog-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: #4a9eff;
    text-decoration: none;
    padding: 0.5rem 1rem;
    border: 1px solid #4a9eff;
    border-radius: 12px;
    transition: all 0.3s ease;
    font-size: 0.9rem;
}

.blog-link:hover {
    background: #4a9eff;
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(74, 158, 255, 0.3);
}

/* Blog Likes Display */
.blog-likes {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: #ffb3d9;
    font-size: 1rem;
    font-weight: 500;
    padding: 0.4rem 0.7rem;
    background: rgba(255, 179, 217, 0.1);
    border-radius: 12px;
    border: 1px solid rgba(255, 179, 217, 0.2);
    transition: all 0.3s ease;
    cursor: default;
}

.blog-likes:hover {
    transform: scale(1.05);
    background: rgba(255, 179, 217, 0.15);
}

.blog-likes i {
    color: #ffb3d9;
    font-size: 1rem;
    transition: all 0.3s ease;
}

.blog-likes .likes-count {
    color: #ffb3d9;
    font-weight: 600;
    min-width: 20px;
    font-size: 1rem;
    letter-spacing: 0.02em;
}

.blog-likes.loading .likes-count {
    opacity: 0.5;
}

.blog-likes.error {
    opacity: 0.4;
}

.blog-likes.error .likes-count::after {
    content: '!';
    color: #ff6b6b;
    margin-left: 0.2rem;
}

.blog-likes[data-platform="qiita"] i {
    color: #ffb3d9;
}

.blog-likes[data-platform="note"] i {
    color: #ffb3d9;
}

/* Language note for Japanese-only articles */
.lang-note {
    color: #999;
    font-size: 0.8em;
    font-weight: normal;
    opacity: 0.8;
}

/* GitHub Statistics - New Single Card Design */
.github-stats-section {
    margin-bottom: 3rem;
}

.github-stats-card {
    background: rgba(26, 26, 26, 0.8);
    border: 1px solid #333;
    border-radius: 16px;
    padding: 2rem;
    transition: all 0.3s ease;
}

.github-stats-card:hover {
    transform: translateY(-3px);
    border-color: #4a9eff;
    box-shadow: 0 12px 35px rgba(74, 158, 255, 0.2);
}

.github-stats-header {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid #333;
}

.github-icon {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: linear-gradient(135deg, #4a9eff, #7b68ee);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.github-icon i {
    font-size: 2rem;
    color: white;
}

.github-info h4 {
    color: #4a9eff;
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
}

.github-info p {
    color: #999;
    font-size: 0.9rem;
    margin: 0;
}

.github-stats-content {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.stats-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1.5rem;
}

.stat-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    background: rgba(0, 0, 0, 0.3);
    border-radius: 12px;
    transition: all 0.3s ease;
}

.stat-item:hover {
    background: rgba(0, 0, 0, 0.5);
    transform: translateY(-2px);
}

.stat-item .stat-icon {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: linear-gradient(135deg, rgba(74, 158, 255, 0.3), rgba(123, 104, 238, 0.3));
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.stat-item .stat-icon i {
    font-size: 1.2rem;
    color: #4a9eff;
}

.stat-details {
    flex: 1;
}

.stat-value {
    font-size: 1.6rem;
    font-weight: 700;
    color: #4a9eff;
    margin-bottom: 0.25rem;
}

.stat-label {
    font-size: 0.85rem;
    color: #999;
    font-weight: 500;
}

.languages-section {
    margin-top: 1rem;
}

.languages-section h5 {
    color: #4a9eff;
    font-size: 1.1rem;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.languages-section h5::before {
    content: "";
    width: 4px;
    height: 20px;
    background: linear-gradient(135deg, #4a9eff, #7b68ee);
    border-radius: 2px;
}

.languages-chart {
    min-height: 150px;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.language-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.5rem 0;
}

.language-info {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.language-color {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    flex-shrink: 0;
}

.language-name {
    color: #e8e8e8;
    font-weight: 500;
}

.language-percentage {
    color: #4a9eff;
    font-weight: 600;
    font-size: 0.9rem;
}

.language-bar {
    height: 4px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 2px;
    overflow: hidden;
    margin-top: 0.5rem;
}

.language-bar-fill {
    height: 100%;
    background: linear-gradient(90deg, #4a9eff, #7b68ee);
    border-radius: 2px;
    transition: width 1s ease;
}

.loading-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    color: #999;
    padding: 2rem;
}

.loading-placeholder i {
    font-size: 1.5rem;
    color: #4a9eff;
}

/* AtCoder Statistics Styles */
.atcoder-stats-section {
    margin-bottom: 3rem;
}

.atcoder-stats-card {
    background: rgba(26, 26, 26, 0.8);
    border: 1px solid #333;
    border-radius: 16px;
    padding: 2rem;
    transition: all 0.3s ease;
}

.atcoder-stats-card:hover {
    transform: translateY(-3px);
    border-color: #4a9eff;
    box-shadow: 0 12px 35px rgba(74, 158, 255, 0.2);
}

.atcoder-stats-header {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid #333;
}

.atcoder-icon {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: linear-gradient(135deg, #4a9eff, #66b3ff);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.atcoder-icon i {
    font-size: 2rem;
    color: white;
}

.atcoder-info h4 {
    color: #4a9eff;
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
}

.atcoder-info p {
    color: #999;
    font-size: 0.9rem;
    margin: 0;
}

.atcoder-stats-content {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.atcoder-stats-content .stats-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1.5rem;
}

.atcoder-stats-content .stat-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    background: rgba(0, 0, 0, 0.3);
    border-radius: 12px;
    transition: all 0.3s ease;
}

.atcoder-stats-content .stat-item:hover {
    background: rgba(0, 0, 0, 0.5);
    transform: translateY(-2px);
}

.atcoder-stats-content .stat-icon {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: linear-gradient(135deg, rgba(74, 158, 255, 0.3), rgba(102, 179, 255, 0.3));
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.atcoder-stats-content .stat-icon i {
    font-size: 1.2rem;
    color: #4a9eff;
}

/* AtCoder Rating Colors */
.rating-color.gray { background: linear-gradient(135deg, rgba(128, 128, 128, 0.3), rgba(169, 169, 169, 0.3)); }
.rating-color.gray i { color: #808080; }

.rating-color.brown { background: linear-gradient(135deg, rgba(74, 158, 255, 0.3), rgba(102, 179, 255, 0.3)); }
.rating-color.brown i { color: #4a9eff; }

.rating-color.green { background: linear-gradient(135deg, rgba(0, 128, 0, 0.3), rgba(34, 139, 34, 0.3)); }
.rating-color.green i { color: #008000; }

.rating-color.cyan { background: linear-gradient(135deg, rgba(0, 191, 255, 0.3), rgba(135, 206, 235, 0.3)); }
.rating-color.cyan i { color: #00BFFF; }

.rating-color.blue { background: linear-gradient(135deg, rgba(0, 0, 255, 0.3), rgba(30, 144, 255, 0.3)); }
.rating-color.blue i { color: #0000FF; }

.rating-color.yellow { background: linear-gradient(135deg, rgba(255, 215, 0, 0.3), rgba(255, 223, 0, 0.3)); }
.rating-color.yellow i { color: #FFD700; }

.rating-color.orange { background: linear-gradient(135deg, rgba(74, 158, 255, 0.3), rgba(102, 179, 255, 0.3)); }
.rating-color.orange i { color: #4a9eff; }

.rating-color.red { background: linear-gradient(135deg, rgba(255, 0, 0, 0.3), rgba(220, 20, 60, 0.3)); }
.rating-color.red i { color: #FF0000; }

.atcoder-stats-content .stat-details {
    flex: 1;
}

.atcoder-stats-content .stat-value {
    font-size: 1.6rem;
    font-weight: 700;
    color: #8B4513;
    margin-bottom: 0.25rem;
}

.atcoder-stats-content .stat-label {
    font-size: 0.85rem;
    color: #999;
    font-weight: 500;
}

/* Stats Update Info */
.stats-update-info {
    margin-top: 1.5rem;
    padding-top: 1rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.last-updated {
    color: #999;
    font-size: 0.85rem;
    margin: 0;
    text-align: right;
}

#rating-chart {
    max-width: 100%;
    height: auto;
}

/* Kaggle Statistics Styles */
.kaggle-stats-section {
    margin-bottom: 3rem;
}

.kaggle-stats-card {
    background: rgba(26, 26, 26, 0.8);
    border: 1px solid #333;
    border-radius: 16px;
    padding: 2rem;
    transition: all 0.3s ease;
}

.kaggle-stats-card:hover {
    transform: translateY(-3px);
    border-color: #20beff;
    box-shadow: 0 12px 35px rgba(32, 190, 255, 0.2);
}

.kaggle-stats-header {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid #333;
}

.kaggle-icon {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: linear-gradient(135deg, #20beff, #0f7abd);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.kaggle-icon i {
    font-size: 2rem;
    color: white;
}

.kaggle-info h4 {
    color: #20beff;
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
}

.kaggle-info p {
    color: #999;
    font-size: 0.9rem;
    margin: 0;
}

.kaggle-stats-content {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.kaggle-stats-content .stats-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1.5rem;
}

.kaggle-stats-content .stat-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    background: rgba(0, 0, 0, 0.3);
    border-radius: 12px;
    transition: all 0.3s ease;
}

.kaggle-stats-content .stat-item:hover {
    background: rgba(0, 0, 0, 0.5);
    transform: translateY(-2px);
}

.kaggle-stats-content .stat-icon {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: linear-gradient(135deg, rgba(32, 190, 255, 0.3), rgba(15, 122, 189, 0.3));
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.kaggle-stats-content .stat-icon i {
    font-size: 1.2rem;
    color: #20beff;
}

.kaggle-stats-content .stat-details {
    flex: 1;
}

.kaggle-stats-content .stat-value {
    font-size: 1.6rem;
    font-weight: 700;
    color: #20beff;
    margin-bottom: 0.25rem;
}

.kaggle-stats-content .stat-label {
    font-size: 0.85rem;
    color: #999;
    font-weight: 500;
}

.medal-breakdown {
    display: flex;
    gap: 0.5rem;
    align-items: center;
    font-size: 1.2rem;
}

.medal-breakdown span {
    font-size: 1.4rem;
    font-weight: 700;
}

.specialization-section {
    margin-top: 1rem;
}

.specialization-section h5 {
    color: #20beff;
    font-size: 1.1rem;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.specialization-section h5::before {
    content: "";
    width: 4px;
    height: 20px;
    background: linear-gradient(135deg, #20beff, #0f7abd);
    border-radius: 2px;
}

.specialization-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.specialization-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 1rem;
    background: rgba(0, 0, 0, 0.2);
    border-radius: 8px;
    border-left: 3px solid #20beff;
}

.specialization-name {
    color: #e8e8e8;
    font-weight: 500;
}

.specialization-stats {
    color: #20beff;
    font-size: 0.9rem;
    font-weight: 600;
}

/* SNS Share Buttons */
.sns-share {
    margin: 3rem 0 2rem 0;
    padding: 2rem 0;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
}

.sns-share h3 {
    margin-bottom: 1.5rem;
    color: #e8e8e8;
    font-size: 1.2rem;
    font-weight: 600;
}

.sns-share-buttons {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.sns-share-btn {
    display: inline-flex;
    align-items: center;
    padding: 0.7rem 1.5rem;
    border: none;
    border-radius: 50px;
    text-decoration: none;
    color: #fff;
    font-weight: 500;
    font-size: 0.9rem;
    transition: all 0.3s ease;
    cursor: pointer;
    min-width: 120px;
    justify-content: center;
}

.sns-share-btn i {
    margin-right: 0.5rem;
    font-size: 1.1rem;
}

.sns-share-btn.twitter {
    background: linear-gradient(135deg, #1da1f2, #0d8bd9);
}

.sns-share-btn.twitter:hover {
    background: linear-gradient(135deg, #0d8bd9, #0a7bc4);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(29, 161, 242, 0.3);
}

.sns-share-btn.facebook {
    background: linear-gradient(135deg, #1877f2, #166fe5);
}

.sns-share-btn.facebook:hover {
    background: linear-gradient(135deg, #166fe5, #1460d0);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(24, 119, 242, 0.3);
}

.sns-share-btn.line {
    background: linear-gradient(135deg, #00c300, #00a000);
}

.sns-share-btn.line:hover {
    background: linear-gradient(135deg, #00a000, #008000);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 195, 0, 0.3);
}

.sns-share-btn.copy {
    background: linear-gradient(135deg, #6c757d, #5a6268);
}

.sns-share-btn.copy:hover {
    background: linear-gradient(135deg, #5a6268, #495057);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(108, 117, 125, 0.3);
}

.sns-share-btn.copy.copied {
    background: linear-gradient(135deg, #28a745, #20a039);
}

/* Custom X icon */
.fa-x-custom {
    font-family: Arial, sans-serif;
    font-weight: bold;
    font-style: normal;
}

.fa-x-custom::before {
    content: "𝕏";
    font-size: 1.1em;
}

/* Footer */
footer {
    background: rgba(255, 255, 255, 0.05);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding: 2rem 0;
    text-align: center;
    margin-top: 4rem;
}

footer p {
    color: #999;
}

footer .last-updated {
    font-size: 0.85rem;
    color: #777;
    margin-bottom: 0.5rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0 15px;
    }

    .nav-container {
        padding: 0 15px;
        flex-direction: column;
        gap: 1rem;
    }

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

    .profile-image img {
        width: 120px;
        height: 120px;
    }

    .overview-grid {
        grid-template-columns: 1fr;
    }

    .profile-section {
        flex-direction: column;
        text-align: center;
    }

    .profile-section .profile-image img {
        width: 150px;
        height: 150px;
    }

    .skills-grid {
        grid-template-columns: 1fr;
    }

    .projects-grid {
        grid-template-columns: 1fr;
    }

    .project-card.featured {
        grid-column: span 1;
    }

    .blog-grid {
        grid-template-columns: 1fr;
    }

    .social-links {
        gap: 1rem;
    }

    .social-link {
        width: 45px;
        height: 45px;
        font-size: 1.1rem;
    }

    .page-hero h1 {
        font-size: 2rem;
    }

    .timeline {
        padding-left: 1.5rem;
    }

    .timeline::before {
        left: 0.75rem;
    }

    .timeline-item::before {
        left: -2rem;
    }

    .search-container {
        max-width: 100%;
    }

    .tag-filters {
        gap: 0.5rem;
    }

    .projects-filters {
        margin-bottom: 2rem;
    }

    .blog-meta-top {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }

    .blog-likes {
        align-self: flex-end;
    }

    .github-stats-card {
        padding: 1.5rem;
    }

    .github-stats-header {
        flex-direction: column;
        text-align: center;
        gap: 1rem;
        margin-bottom: 1.5rem;
        padding-bottom: 1rem;
    }

    .github-icon {
        width: 50px;
        height: 50px;
    }

    .github-icon i {
        font-size: 1.5rem;
    }

    .stats-row {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .stat-item {
        padding: 0.75rem;
        flex-direction: column;
        text-align: center;
        gap: 0.75rem;
    }

    .stat-item .stat-icon {
        width: 35px;
        height: 35px;
    }

    .stat-item .stat-icon i {
        font-size: 1rem;
    }

    .stat-value {
        font-size: 1.4rem;
    }

    .languages-section h5 {
        font-size: 1rem;
    }

    .atcoder-stats-card {
        padding: 1.5rem;
    }

    .atcoder-stats-header {
        flex-direction: column;
        text-align: center;
        gap: 1rem;
        margin-bottom: 1.5rem;
        padding-bottom: 1rem;
    }

    .atcoder-icon {
        width: 50px;
        height: 50px;
    }

    .atcoder-icon i {
        font-size: 1.5rem;
    }

    .atcoder-stats-content .stats-row {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .atcoder-stats-content .stat-item {
        padding: 0.75rem;
        flex-direction: column;
        text-align: center;
        gap: 0.75rem;
    }

    .atcoder-stats-content .stat-icon {
        width: 35px;
        height: 35px;
    }

    .atcoder-stats-content .stat-icon i {
        font-size: 1rem;
    }

    .atcoder-stats-content .stat-value {
        font-size: 1.4rem;
    }

    .rating-graph-section h5 {
        font-size: 1rem;
    }

    .rating-graph {
        padding: 1rem;
        min-height: 250px;
    }

    .kaggle-stats-card {
        padding: 1.5rem;
    }

    .kaggle-stats-header {
        flex-direction: column;
        text-align: center;
        gap: 1rem;
        margin-bottom: 1.5rem;
        padding-bottom: 1rem;
    }

    .kaggle-icon {
        width: 50px;
        height: 50px;
    }

    .kaggle-icon i {
        font-size: 1.5rem;
    }

    .kaggle-stats-content .stats-row {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .kaggle-stats-content .stat-item {
        padding: 0.75rem;
        flex-direction: column;
        text-align: center;
        gap: 0.75rem;
    }

    .kaggle-stats-content .stat-icon {
        width: 35px;
        height: 35px;
    }

    .kaggle-stats-content .stat-icon i {
        font-size: 1rem;
    }

    .kaggle-stats-content .stat-value {
        font-size: 1.4rem;
    }

    .specialization-section h5 {
        font-size: 1rem;
    }

    .medal-breakdown {
        flex-direction: column;
        gap: 0.25rem;
    }

    .specialization-item {
        flex-direction: column;
        text-align: center;
        gap: 0.5rem;
    }

    .sns-share-buttons {
        flex-direction: column;
        align-items: center;
        max-width: 300px;
        margin: 0 auto;
    }

    .sns-share-btn {
        width: 100%;
        max-width: 250px;
    }
}

@media (max-width: 480px) {
    .overview-card, .bio-section, .skills-section, .certifications-section, .achievements-section, .education-section {
        padding: 1.5rem;
    }

    .project-info, .blog-info {
        padding: 1.5rem;
    }

    .project-links, .blog-links {
        flex-direction: column;
    }
}

/* Blog Tag Colors - Vibrant Pastels (same as project tags) */
.blog-tag {
    padding: 0.3rem 0.8rem;
    background: rgba(74, 158, 255, 0.1);
    color: #4a9eff;
    border: 1px solid rgba(74, 158, 255, 0.2);
    border-radius: 12px;
    font-size: 0.8rem;
    font-weight: 500;
    transition: all 0.3s ease;
}

.blog-tag.tag-ai { background: linear-gradient(135deg, #fed7aa 0%, #fdba74 100%); color: #c2410c; box-shadow: 0 2px 4px rgba(194, 65, 12, 0.15); }
.blog-tag.tag-machine { background: linear-gradient(135deg, #fecaca 0%, #fca5a5 100%); color: #dc2626; box-shadow: 0 2px 4px rgba(220, 38, 38, 0.15); }
.blog-tag.tag-learning { background: linear-gradient(135deg, #fecaca 0%, #fca5a5 100%); color: #dc2626; box-shadow: 0 2px 4px rgba(220, 38, 38, 0.15); }
.blog-tag.tag-deep { background: linear-gradient(135deg, #ddd6fe 0%, #c4b5fd 100%); color: #6b21a8; box-shadow: 0 2px 4px rgba(107, 33, 168, 0.15); }
.blog-tag.tag-tensorflow { background: linear-gradient(135deg, #fed7aa 0%, #fdba74 100%); color: #c2410c; box-shadow: 0 2px 4px rgba(194, 65, 12, 0.15); }
.blog-tag.tag-blender { background: linear-gradient(135deg, #fed7aa 0%, #fdba74 100%); color: #c2410c; box-shadow: 0 2px 4px rgba(194, 65, 12, 0.15); }
.blog-tag.tag-3d { background: linear-gradient(135deg, #d8b4fe 0%, #c084fc 100%); color: #7e22ce; box-shadow: 0 2px 4px rgba(126, 34, 206, 0.15); }
.blog-tag.tag-modeling { background: linear-gradient(135deg, #d8b4fe 0%, #c084fc 100%); color: #7e22ce; box-shadow: 0 2px 4px rgba(126, 34, 206, 0.15); }
.blog-tag.tag-vrm { background: linear-gradient(135deg, #f9c5ff 0%, #f08fff 100%); color: #a21caf; box-shadow: 0 2px 4px rgba(162, 28, 175, 0.15); }
.blog-tag.tag-character { background: linear-gradient(135deg, #ffc9e0 0%, #ff8fb3 100%); color: #be185d; box-shadow: 0 2px 4px rgba(190, 24, 93, 0.15); }
.blog-tag.tag-design { background: linear-gradient(135deg, #ffc9e0 0%, #ff8fb3 100%); color: #be185d; box-shadow: 0 2px 4px rgba(190, 24, 93, 0.15); }
.blog-tag.tag-tool { background: linear-gradient(135deg, #d4d4d8 0%, #a1a1aa 100%); color: #18181b; box-shadow: 0 2px 4px rgba(24, 24, 27, 0.15); }
.blog-tag.tag-development { background: linear-gradient(135deg, #99f6e4 0%, #5eead4 100%); color: #0f766e; box-shadow: 0 2px 4px rgba(15, 118, 110, 0.15); }
.blog-tag.tag-python { background: linear-gradient(135deg, #a8d5ff 0%, #7fb3ff 100%); color: #2563eb; box-shadow: 0 2px 4px rgba(37, 99, 235, 0.15); }
.blog-tag.tag-animation { background: linear-gradient(135deg, #d8b4fe 0%, #c084fc 100%); color: #7e22ce; box-shadow: 0 2px 4px rgba(126, 34, 206, 0.15); }
.blog-tag.tag-react { background: linear-gradient(135deg, #b3f0ff 0%, #61dafb 100%); color: #0369a1; box-shadow: 0 2px 4px rgba(3, 105, 161, 0.15); }
.blog-tag.tag-javascript { background: linear-gradient(135deg, #fff7a8 0%, #ffed4e 100%); color: #d97706; box-shadow: 0 2px 4px rgba(217, 119, 6, 0.15); }
.blog-tag.tag-web { background: linear-gradient(135deg, #99f6e4 0%, #5eead4 100%); color: #0f766e; box-shadow: 0 2px 4px rgba(15, 118, 110, 0.15); }
.blog-tag.tag-frontend { background: linear-gradient(135deg, #b3f0ff 0%, #61dafb 100%); color: #0369a1; box-shadow: 0 2px 4px rgba(3, 105, 161, 0.15); }
.blog-tag.tag-node\.js { background: linear-gradient(135deg, #a7f3d0 0%, #6ee7b7 100%); color: #047857; box-shadow: 0 2px 4px rgba(4, 120, 87, 0.15); }
.blog-tag.tag-rest { background: linear-gradient(135deg, #d4d4d8 0%, #a1a1aa 100%); color: #18181b; box-shadow: 0 2px 4px rgba(24, 24, 27, 0.15); }
.blog-tag.tag-api { background: linear-gradient(135deg, #d4d4d8 0%, #a1a1aa 100%); color: #18181b; box-shadow: 0 2px 4px rgba(24, 24, 27, 0.15); }
.blog-tag.tag-backend { background: linear-gradient(135deg, #a7f3d0 0%, #6ee7b7 100%); color: #047857; box-shadow: 0 2px 4px rgba(4, 120, 87, 0.15); }
.blog-tag.tag-express\.js { background: linear-gradient(135deg, #d4d4d8 0%, #a1a1aa 100%); color: #18181b; box-shadow: 0 2px 4px rgba(24, 24, 27, 0.15); }
.blog-tag.tag-algorithm { background: linear-gradient(135deg, #bfdbfe 0%, #93c5fd 100%); color: #1d4ed8; box-shadow: 0 2px 4px rgba(29, 78, 216, 0.15); }
.blog-tag.tag-data { background: linear-gradient(135deg, #bfdbfe 0%, #93c5fd 100%); color: #1d4ed8; box-shadow: 0 2px 4px rgba(29, 78, 216, 0.15); }
.blog-tag.tag-structures { background: linear-gradient(135deg, #bfdbfe 0%, #93c5fd 100%); color: #1d4ed8; box-shadow: 0 2px 4px rgba(29, 78, 216, 0.15); }
.blog-tag.tag-dynamic { background: linear-gradient(135deg, #ddd6fe 0%, #c4b5fd 100%); color: #6b21a8; box-shadow: 0 2px 4px rgba(107, 33, 168, 0.15); }
.blog-tag.tag-programming { background: linear-gradient(135deg, #ddd6fe 0%, #c4b5fd 100%); color: #6b21a8; box-shadow: 0 2px 4px rgba(107, 33, 168, 0.15); }
.blog-tag.tag-graph { background: linear-gradient(135deg, #bfdbfe 0%, #93c5fd 100%); color: #1d4ed8; box-shadow: 0 2px 4px rgba(29, 78, 216, 0.15); }
.blog-tag.tag-theory { background: linear-gradient(135deg, #bfdbfe 0%, #93c5fd 100%); color: #1d4ed8; box-shadow: 0 2px 4px rgba(29, 78, 216, 0.15); }
.blog-tag.tag-computer { background: linear-gradient(135deg, #d4d4d8 0%, #a1a1aa 100%); color: #18181b; box-shadow: 0 2px 4px rgba(24, 24, 27, 0.15); }
.blog-tag.tag-science { background: linear-gradient(135deg, #bfdbfe 0%, #93c5fd 100%); color: #1d4ed8; box-shadow: 0 2px 4px rgba(29, 78, 216, 0.15); }
.blog-tag.tag-nlp { background: linear-gradient(135deg, #fed7aa 0%, #fdba74 100%); color: #c2410c; box-shadow: 0 2px 4px rgba(194, 65, 12, 0.15); }
.blog-tag.tag-transformer { background: linear-gradient(135deg, #ddd6fe 0%, #c4b5fd 100%); color: #6b21a8; box-shadow: 0 2px 4px rgba(107, 33, 168, 0.15); }
.blog-tag.tag-unity { background: linear-gradient(135deg, #d4d4d8 0%, #a1a1aa 100%); color: #18181b; box-shadow: 0 2px 4px rgba(24, 24, 27, 0.15); }
.blog-tag.tag-aituber { background: linear-gradient(135deg, #f9c5ff 0%, #f08fff 100%); color: #a21caf; box-shadow: 0 2px 4px rgba(162, 28, 175, 0.15); }
.blog-tag.tag-software { background: linear-gradient(135deg, #99f6e4 0%, #5eead4 100%); color: #0f766e; box-shadow: 0 2px 4px rgba(15, 118, 110, 0.15); }