/* --- Utility & Reset --- */
*, *::before, *::after {
    box-sizing: border-box;
}

body, h1, h2, h3, h4, p, ul, li, img, a {
    margin: 0;
    padding: 0;
}

/* カラーパレット */
:root {
    --c-primary: hsl(220, 85%, 58%);
    --c-secondary: hsl(220, 15%, 96%);
    --c-dark: hsl(220, 15%, 15%);
    --c-light: hsl(220, 50%, 99%);
    --c-accent: hsl(340, 75%, 65%);
    
    /* カテゴリ専用カラー - 統一性を持った色相ベース */
    --c-featured: hsl(280, 70%, 58%);
    --c-vr: hsl(210, 75%, 55%);
    --c-display: hsl(150, 65%, 50%);
    --c-tool: hsl(35, 80%, 55%);
    
    /* セクションタイトル用 */
    --c-about: hsl(190, 65%, 55%);
    --c-works: var(--c-primary);
    --c-contact: hsl(320, 65%, 55%);
    
    --c-text-light: hsl(220, 15%, 40%);
    --c-border: hsl(220, 20%, 88%);
    
    /* Claude Portfolio Section */
    --c-claude: hsl(265, 85%, 58%);
    --c-claude-bg: hsl(265, 25%, 98%);
}

/* 基本スタイル */
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
    background: var(--c-light);
    color: var(--c-dark);
    line-height: 1.6;
    min-height: 100vh;
    font-size: 16px;
}

header {
    background: var(--c-primary);
    color: var(--c-light);
    padding: 1.5rem 0 1rem 0;
    text-align: center;
    margin-bottom: 2rem;
    letter-spacing: 0.05em;
    position: relative;
}

header h1 {
    font-size: 2.8rem;
    font-weight: 700;
    letter-spacing: 0.02em;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--c-accent);
    display: inline-block;
}

#theme-toggle {
    position: absolute;
    top: 1rem;
    right: 1rem;
    width: 2.2rem;
    height: 2.2rem;
    border-radius: 50%;
    border: 2px solid var(--c-light);
    background: transparent;
    color: var(--c-light);
    font-size: 1rem;
    cursor: pointer;
}

#theme-toggle:focus-visible {
    outline: 2px solid var(--c-accent);
    outline-offset: 2px;
}

.language-toggle {
    background: rgba(255, 255, 255, 0.2);
    border: 2px solid var(--c-light);
    color: var(--c-light);
    padding: 0.4rem 0.8rem;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-block;
}

.language-toggle:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: translateY(-1px);
}

.language-toggle:focus-visible {
    outline: 2px solid var(--c-accent);
    outline-offset: 2px;
}

.hero {
    background: linear-gradient(120deg, var(--c-primary), var(--c-featured));
    color: var(--c-light);
    padding: 4rem 1rem;
    text-align: center;
    margin-bottom: 2rem;
}

.hero-tagline {
    font-size: 1.6rem;
    letter-spacing: 0.03em;
}

nav ul {
    list-style: none;
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-top: 1rem;
}

nav a {
    color: var(--c-light);
    text-decoration: none;
    font-weight: 500;
    font-size: 1.1rem;
}

nav a:focus-visible {
    outline: 2px solid var(--c-accent);
    outline-offset: 2px;
}

main {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 1rem;
}

/* メインセクション見出し */
section h2 {
    font-size: 1.8rem;
    margin-bottom: 1.5rem;
    padding-left: 0.75rem;
    border-left: 6px solid var(--c-primary);
    color: var(--c-dark);
}

#about h2 {
    border-color: var(--c-about);
}

#works h2 {
    border-color: var(--c-works);
}

#contact h2 {
    border-color: var(--c-contact);
}

/* スキルカテゴリー */
.skill-categories {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
    margin: 2rem 0;
}

.skill-group {
    background: var(--c-secondary);
    border-radius: 10px;
    padding: 1.5rem;
    border-top: 4px solid var(--c-about);
    box-shadow: 0 2px 8px rgba(0,0,0,0.04);
}

.skill-group h3 {
    font-size: 1.1rem;
    margin-bottom: 1rem;
    color: var(--c-about);
    font-weight: 600;
}

.skill-group ul {
    list-style: none;
    padding: 0;
}

.skill-group li {
    margin-bottom: 0.6rem;
    color: var(--c-dark);
    line-height: 1.5;
}

.skill-group strong {
    color: var(--c-about);
}

/* リンクセクション */
.links-section {
    background: var(--c-secondary);
    border-radius: 10px;
    padding: 1.5rem;
    margin: 2rem 0;
    border-left: 5px solid var(--c-about);
    text-align: center;
}

.links-section a {
    color: var(--c-about);
    text-decoration: none;
    font-weight: 500;
}

.links-section a:hover {
    text-decoration: underline;
}

/* 全作品リンクセクション */
.more-works-section {
    text-align: center;
    margin: 2.5rem 0;
    padding: 1.5rem;
    background: var(--c-secondary);
    border-radius: 10px;
    border-top: 4px solid var(--c-primary);
}

.more-works-section a {
    color: var(--c-primary);
    text-decoration: none;
    font-weight: 600;
    font-size: 1.1rem;
}

.works-category {
    margin-bottom: 2.5rem;
}

.works-category h3 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    padding-left: 0.5rem;
    border-left: 5px solid var(--c-primary);
}

/* カテゴリごとの統一カラー */
.works-category:nth-of-type(1) h3 {
    border-color: var(--c-featured);
}

.works-category:nth-of-type(2) h3 {
    border-color: var(--c-vr);
}

.works-category:nth-of-type(3) h3 {
    border-color: var(--c-display);
}

.works-category:nth-of-type(4) h3 {
    border-color: var(--c-tool);
}

.works-list {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
    margin: 2rem 0;
}

.work-item {
    background: var(--c-secondary);
    border-radius: 10px;
    padding: 1rem;
    box-shadow: 0 2px 8px rgba(0,0,0,0.04);
    text-align: center;
    border-top: 4px solid var(--c-primary);
    transition: box-shadow 0.2s;
}

/* カテゴリごとの統一カラー */
.works-category:nth-of-type(1) .work-item {
    border-top-color: var(--c-featured);
}

.works-category:nth-of-type(2) .work-item {
    border-top-color: var(--c-vr);
}

.works-category:nth-of-type(3) .work-item {
    border-top-color: var(--c-display);
}

.works-category:nth-of-type(4) .work-item {
    border-top-color: var(--c-tool);
}

.work-item img {
    width: 100%;
    max-width: 320px;
    border-radius: 8px;
    margin-bottom: 0.7rem;
    background: #eee;
}

.work-item h4 {
    margin: 0.5rem 0 0.2rem 0;
    font-size: 1.1rem;
    color: var(--c-dark);
}

footer {
    text-align: center;
    color: var(--c-dark);
    margin-top: 3rem;
    padding: 2rem 0;
    font-size: 0.95rem;
    border-top: 1px solid var(--c-border);
}

/* --- 作品メタ情報バッジ --- */
.work-meta {
    display: inline-block;
    margin-top: 0.4em;
    padding: 0.2em 0.8em;
    font-size: 0.9em;
    font-weight: 600;
    border-radius: 1.2em;
    background: var(--c-primary);
    color: var(--c-light);
    letter-spacing: 0.02em;
    vertical-align: middle;
    box-shadow: 0 2px 6px rgba(0,0,0,0.12);
    transition: background 0.2s, color 0.2s, box-shadow 0.2s;
}

/* 代表作品セクション */
.works-category:nth-of-type(1) .work-meta {
    background: var(--c-featured);
    color: var(--c-light);
}

/* VR/AR Projects */
.works-category:nth-of-type(2) .work-meta {
    background: var(--c-vr);
    color: var(--c-light);
}

/* 立体視・ディスプレイ技術 */
.works-category:nth-of-type(3) .work-meta {
    background: var(--c-display);
    color: var(--c-light);
}

/* Tools & Utilities */
.works-category:nth-of-type(4) .work-meta {
    background: var(--c-tool);
    color: var(--c-light);
}


body.dark {
    --c-about-dark: hsl(190, 55%, 75%);
    --c-works-dark: hsl(220, 55%, 75%);
    --c-featured-dark: hsl(280, 55%, 75%);
    --c-vr-dark: hsl(210, 55%, 75%);
    --c-display-dark: hsl(150, 50%, 75%);
    --c-tool-dark: hsl(35, 60%, 75%);
    --c-contact-dark: hsl(320, 55%, 75%);
    background: var(--c-dark);
    color: var(--c-light);
}

body.dark header {
    background: var(--c-dark);
    color: var(--c-light);
}

body.dark header h1 {
    border-bottom-color: var(--c-accent);
}

body.dark nav a {
    color: var(--c-light);
}

body.dark section h2 {
    color: var(--c-light);
}

body.dark #about h2 {
    border-color: var(--c-about-dark);
}

body.dark #works h2 {
    border-color: var(--c-works-dark);
}

body.dark #contact h2 {
    border-color: var(--c-contact-dark);
}

body.dark .skill-group {
    background: hsl(220, 10%, 25%);
    border-top-color: var(--c-about-dark);
}

body.dark .skill-group h3 {
    color: var(--c-about-dark);
}

body.dark .skill-group li {
    color: var(--c-light);
}

body.dark .skill-group strong {
    color: var(--c-about-dark);
}

body.dark .links-section {
    background: hsl(220, 10%, 25%);
    border-left-color: var(--c-about-dark);
}

body.dark .links-section a {
    color: var(--c-about-dark);
}

body.dark .work-item {
    background: hsl(220, 10%, 25%);
    color: var(--c-light);
}

body.dark .more-works-section {
    background: hsl(220, 10%, 25%);
}

body.dark .more-works-section a {
    color: var(--c-accent);
}

body.dark footer {
    color: var(--c-secondary);
}

body.dark .work-meta {
    box-shadow: 0 2px 6px rgba(255,255,255,0.1);
}

body.dark .works-category:nth-of-type(1) .work-meta {
    background: var(--c-featured-dark);
    color: var(--c-dark);
}

body.dark .works-category:nth-of-type(2) .work-meta {
    background: var(--c-vr-dark);
    color: var(--c-dark);
}

body.dark .works-category:nth-of-type(3) .work-meta {
    background: var(--c-display-dark);
    color: var(--c-dark);
}

body.dark .works-category:nth-of-type(4) .work-meta {
    background: var(--c-tool-dark);
    color: var(--c-dark);
}

body.dark .hero {
    background: linear-gradient(120deg, var(--c-dark), var(--c-vr-dark));
    color: var(--c-light);
}

body.dark #theme-toggle {
    border-color: var(--c-light);
    color: var(--c-light);
}

body.dark .ai-disclaimer {
    background: hsl(220, 10%, 25%);
    color: var(--c-light);
    border-left-color: var(--c-accent);
}

body.dark .ai-disclaimer strong {
    color: var(--c-accent);
}

/* --- レスポンシブ --- */
@media (min-width: 768px) {
    .skill-categories {
        grid-template-columns: 1fr 1fr;
    }
    
    .works-list {
        grid-template-columns: 1fr 1fr;
    }
    
    section h2 {
        font-size: 2rem;
    }
    
    .works-category h3 {
        font-size: 1.4rem;
    }
}

/* AI免責事項 */
.ai-disclaimer {
    background: var(--c-secondary);
    color: var(--c-text-light);
    padding: 1rem; /* 内側の余白 */
    margin: 0 auto 2rem auto; /* 上下マージンと左右autoで中央寄せ */
    width: 100%; /* 親要素に対して幅100%を試みる */
    max-width: 900px; /* ただし最大幅は900px (main要素と合わせる) */
    box-sizing: border-box; /* paddingとborderをwidth/heightに含める */
    text-align: center;
    border-radius: 8px;
    font-size: 0.9rem;
    border-left: 5px solid var(--c-accent);
}

.ai-disclaimer strong {
    color: var(--c-accent);
}

/* Claude Code Enhanced Portfolio Section */
.claude-portfolio-section {
    margin: 2rem auto;
    max-width: 900px;
    padding: 0 1rem;
}

.claude-portfolio-card {
    background: linear-gradient(135deg, var(--c-claude-bg), var(--c-secondary));
    border: 3px solid var(--c-claude);
    border-radius: 16px;
    padding: 2rem;
    text-align: center;
    position: relative;
    overflow: hidden;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
}

.claude-portfolio-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.15);
}

.claude-portfolio-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(45deg, transparent, rgba(255,255,255,0.1), transparent);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.claude-portfolio-card:hover::before {
    opacity: 1;
}

.claude-portfolio-content h3 {
    color: var(--c-claude);
    font-size: 1.5rem;
    margin-bottom: 1rem;
    font-weight: 700;
}

.claude-portfolio-content p {
    color: var(--c-text-light);
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
    line-height: 1.6;
}

.portfolio-features {
    display: flex;
    gap: 0.5rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 1.5rem;
}

.feature-tag {
    background: var(--c-claude);
    color: white;
    padding: 0.4rem 0.8rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
}

.claude-portfolio-btn {
    display: inline-block;
    background: linear-gradient(135deg, var(--c-claude), var(--c-accent));
    color: white;
    padding: 1rem 2rem;
    border-radius: 30px;
    text-decoration: none;
    font-weight: 700;
    font-size: 1.1rem;
    transition: all 0.3s ease;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.claude-portfolio-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 18px rgba(0, 0, 0, 0.25);
    background: linear-gradient(135deg, var(--c-accent), var(--c-claude));
}

/* Dark mode styles for Claude section */
body.dark .claude-portfolio-card {
    background: linear-gradient(135deg, hsl(265, 15%, 15%), hsl(220, 10%, 18%));
    border-color: var(--c-claude);
}

body.dark .claude-portfolio-content h3 {
    color: var(--c-claude);
}

body.dark .claude-portfolio-content p {
    color: var(--c-light);
}

body.dark .feature-tag {
    background: var(--c-claude);
}