/* MechaToraのブログ - モダンIT系デザイン */

:root {
    /* テック系カラーパレット */
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --accent-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --dark-gradient: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
    --tech-blue: #00d4ff;
    --tech-purple: #a855f7;
    --tech-pink: #ec4899;

    /* ダークテーマカラー */
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-card: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --border-color: #334155;

    /* アクセントカラー */
    --primary-color: #00d4ff;
    --primary-dark: #0ea5e9;
    --success-color: #10b981;
    --link-color: #00d4ff;
    --link-hover: #a855f7;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Hiragino Sans', sans-serif;
    line-height: 1.7;
    color: var(--text-primary);
    background: var(--bg-primary);
    font-size: 16px;
    background-image:
        radial-gradient(at 0% 0%, rgba(102, 126, 234, 0.1) 0px, transparent 50%),
        radial-gradient(at 100% 100%, rgba(168, 85, 247, 0.1) 0px, transparent 50%);
    background-attachment: fixed;
}

/* コンテナ */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
}

.content-wrapper {
    max-width: 900px;
    margin: 0 auto;
}

/* ヘッダー - グラスモーフィズム */
header {
    background: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(100, 126, 234, 0.2);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.2rem 0;
}

.logo {
    font-size: 1.75rem;
    font-weight: 800;
    background: linear-gradient(135deg, #00d4ff 0%, #a855f7 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    transition: all 0.3s ease;
}

.logo:hover {
    transform: translateY(-2px);
    filter: brightness(1.2);
}

/* ナビゲーション */
nav ul {
    list-style: none;
    display: flex;
    gap: 2.5rem;
}

nav a {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 600;
    font-size: 0.95rem;
    transition: all 0.3s ease;
    position: relative;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

nav a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--tech-blue), var(--tech-purple));
    transition: width 0.3s ease;
}

nav a:hover {
    color: var(--primary-color);
}

nav a:hover::after {
    width: 100%;
}

/* メインコンテンツ */
main {
    min-height: calc(100vh - 300px);
    padding: 4rem 0;
}

/* セクションタイトル */
.section-title {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 3rem;
    background: linear-gradient(135deg, #00d4ff 0%, #a855f7 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-align: center;
}

/* 記事カード - モダンデザイン */
.article-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 2rem;
    margin-bottom: 2rem;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.article-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--tech-blue), var(--tech-purple), var(--tech-pink));
    opacity: 0;
    transition: opacity 0.4s ease;
}

.article-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 40px rgba(0, 212, 255, 0.15);
    border-color: var(--tech-blue);
}

.article-card:hover::before {
    opacity: 1;
}

/* 記事グリッド */
.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.article-card-grid {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    overflow: hidden;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
}

.article-card-grid::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--tech-blue), var(--tech-purple));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.4s ease;
}

.article-card-grid:hover {
    transform: translateY(-10px);
    box-shadow: 0 25px 50px rgba(168, 85, 247, 0.2);
    border-color: var(--tech-purple);
}

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

.article-thumbnail {
    width: 100%;
    height: 220px;
    overflow: hidden;
    background: var(--bg-card);
}

.article-thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}

.article-card-grid:hover .article-thumbnail img {
    transform: scale(1.1);
}

.article-card-content {
    padding: 1.5rem;
}

/* 記事メタ情報 */
.article-meta {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
    font-size: 0.85rem;
}

.article-category {
    background: linear-gradient(135deg, rgba(0, 212, 255, 0.2), rgba(168, 85, 247, 0.2));
    color: var(--tech-blue);
    padding: 0.4rem 1rem;
    border-radius: 20px;
    font-weight: 600;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border: 1px solid rgba(0, 212, 255, 0.3);
}

.article-meta time {
    color: var(--text-secondary);
    font-size: 0.85rem;
}

/* 記事タイトル */
.article-title {
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: 1rem;
    line-height: 1.4;
}

.article-title a {
    color: var(--text-primary);
    text-decoration: none;
    transition: all 0.3s ease;
    background: linear-gradient(135deg, var(--tech-blue), var(--tech-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    background-size: 200% 200%;
}

.article-title a:hover {
    background-position: 100% 100%;
}

/* 記事抜粋 */
.article-excerpt {
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 1.5rem;
}

/* 続きを読むリンク */
.read-more {
    color: var(--tech-purple);
    text-decoration: none;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.3s ease;
}

.read-more:hover {
    color: var(--tech-blue);
    gap: 0.75rem;
}

/* カテゴリカード */
.category-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.category-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 2rem;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.category-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(0, 212, 255, 0.05), rgba(168, 85, 247, 0.05));
    opacity: 0;
    transition: opacity 0.4s ease;
}

.category-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0, 212, 255, 0.2);
    border-color: var(--tech-blue);
}

.category-card:hover::before {
    opacity: 1;
}

.category-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--tech-blue), var(--tech-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.category-card p {
    color: var(--text-secondary);
}

/* ボタン */
.btn {
    display: inline-block;
    padding: 1rem 2.5rem;
    background: linear-gradient(135deg, var(--tech-blue), var(--tech-purple));
    color: white;
    text-decoration: none;
    border-radius: 50px;
    font-weight: 600;
    transition: all 0.4s ease;
    box-shadow: 0 10px 30px rgba(0, 212, 255, 0.3);
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
    transition: left 0.5s ease;
}

.btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 40px rgba(168, 85, 247, 0.4);
}

.btn:hover::before {
    left: 100%;
}

/* パンくずリスト */
.breadcrumb {
    margin: 2rem 0;
    padding: 1rem;
    background: rgba(30, 41, 59, 0.5);
    border-radius: 12px;
    backdrop-filter: blur(10px);
}

.breadcrumb ul {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    font-size: 0.9rem;
}

.breadcrumb li:not(:last-child)::after {
    content: '→';
    margin-left: 0.75rem;
    color: var(--tech-blue);
}

.breadcrumb a {
    color: var(--tech-purple);
    text-decoration: none;
    transition: color 0.3s ease;
}

.breadcrumb a:hover {
    color: var(--tech-blue);
}

/* 記事本文スタイル */
article h1 {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 2rem;
    line-height: 1.3;
    background: linear-gradient(135deg, #00d4ff, #a855f7);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

article h2 {
    font-size: 2rem;
    font-weight: 700;
    margin: 3rem 0 1.5rem;
    padding-left: 1rem;
    border-left: 4px solid var(--tech-blue);
    color: var(--text-primary);
}

article h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin: 2rem 0 1rem;
    color: var(--tech-purple);
}

article p {
    margin-bottom: 1.5rem;
    line-height: 1.8;
}

article ul, article ol {
    margin: 1.5rem 0;
    padding-left: 2rem;
}

article li {
    margin-bottom: 0.75rem;
    line-height: 1.7;
}

article a {
    color: var(--tech-blue);
    text-decoration: none;
    border-bottom: 1px solid rgba(0, 212, 255, 0.3);
    transition: all 0.3s ease;
}

article a:hover {
    color: var(--tech-purple);
    border-bottom-color: var(--tech-purple);
}

article code {
    background: var(--bg-secondary);
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    font-family: 'Fira Code', 'Courier New', monospace;
    font-size: 0.9em;
    color: var(--tech-blue);
}

article pre {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
    margin: 2rem 0;
    overflow-x: auto;
}

article pre code {
    background: none;
    padding: 0;
}

/* フッター */
footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    margin-top: 5rem;
    padding: 4rem 0 2rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-section h3 {
    font-size: 1.2rem;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--tech-blue), var(--tech-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.footer-section ul {
    list-style: none;
}

.footer-section li {
    margin-bottom: 0.75rem;
}

.footer-section a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-section a:hover {
    color: var(--tech-blue);
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* レスポンシブ */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: 1rem;
    }

    nav ul {
        gap: 1.5rem;
    }

    .section-title {
        font-size: 2rem;
    }

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

    .category-list {
        grid-template-columns: 1fr;
    }

    article h1 {
        font-size: 2rem;
    }

    article h2 {
        font-size: 1.5rem;
    }
}

/* スクロールバーカスタマイズ */
::-webkit-scrollbar {
    width: 12px;
}

::-webkit-scrollbar-track {
    background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, var(--tech-blue), var(--tech-purple));
    border-radius: 6px;
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(180deg, var(--tech-purple), var(--tech-pink));
}