/*
  AIFlows - Clean & Minimalist Blog Stylesheet
  Theme: Tech Minimalist (High Performance, Responsive)
*/

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Outfit:wght@400;600;800&display=swap');

:root {
    --bg-main: #ffffff;
    --bg-sub: #f8fafc;
    --text-main: #0f172a;
    --text-sub: #475569;
    --text-light: #94a3b8;
    --accent: #2563eb; /* Cobalt Blue */
    --accent-hover: #1d4ed8;
    --border: #e2e8f0;
    --card-shadow: 0 4px 20px -2px rgba(15, 23, 42, 0.04), 0 2px 8px -1px rgba(15, 23, 42, 0.02);
    --card-shadow-hover: 0 20px 25px -5px rgba(15, 23, 42, 0.08), 0 10px 10px -5px rgba(15, 23, 42, 0.04);
}

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

body {
    font-family: 'Inter', 'Noto Sans JP', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--bg-main);
    color: var(--text-main);
    line-height: 1.75;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    letter-spacing: -0.011em;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: 'Outfit', sans-serif;
    color: var(--text-main);
    font-weight: 700;
    line-height: 1.25;
    letter-spacing: -0.02em;
}

a {
    color: inherit;
    text-decoration: none;
    transition: color 0.2s ease, opacity 0.2s ease;
}

/* Layout */
.container {
    width: 100%;
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Header & Nav */
header.site-header {
    border-b: 1px solid var(--border);
    position: sticky;
    top: 0;
    background-color: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    z-index: 100;
    border-bottom: 1px solid var(--border);
}

.nav-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 72px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-family: 'Outfit', sans-serif;
    font-size: 22px;
    font-weight: 800;
    color: var(--text-main);
}

.logo-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: var(--accent);
}

nav.main-nav {
    display: flex;
    gap: 24px;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-sub);
}

nav.main-nav a:hover, nav.main-nav a.active {
    color: var(--accent);
}

/* Hero Section */
.hero {
    padding: 80px 0 60px 0;
    text-align: center;
    background-color: var(--bg-sub);
    border-bottom: 1px solid var(--border);
}

.hero-tag {
    display: inline-block;
    padding: 4px 12px;
    background-color: rgba(37, 99, 235, 0.08);
    color: var(--accent);
    font-size: 12px;
    font-weight: 600;
    border-radius: 9999px;
    margin-bottom: 16px;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.hero h1 {
    font-size: 40px;
    margin-bottom: 16px;
}

.hero p {
    color: var(--text-sub);
    font-size: 18px;
    max-w-2xl: 600px;
    margin: 0 auto;
    font-weight: 300;
}

/* Filter bar */
.filter-bar {
    display: flex;
    gap: 12px;
    padding: 32px 0;
    border-bottom: 1px solid var(--border);
    overflow-x: auto;
    white-space: nowrap;
    -webkit-overflow-scrolling: touch;
}

.filter-btn {
    padding: 8px 16px;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    background-color: var(--bg-sub);
    border: 1px solid var(--border);
    cursor: pointer;
    transition: all 0.2s ease;
}

.filter-btn:hover, .filter-btn.active {
    background-color: var(--accent);
    color: #ffffff;
    border-color: var(--accent);
}

/* Grid & Cards */
.blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 32px;
    padding: 48px 0;
}

.card {
    display: flex;
    flex-direction: column;
    background: var(--bg-main);
    border-radius: 16px;
    border: 1px solid var(--border);
    overflow: hidden;
    box-shadow: var(--card-shadow);
    transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--card-shadow-hover);
    border-color: rgba(37, 99, 235, 0.2);
}

.card-image-wrap {
    aspect-ratio: 16 / 9;
    width: 100%;
    overflow: hidden;
    background-color: var(--bg-sub);
    position: relative;
}

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

.card:hover .card-image-wrap img {
    transform: scale(1.03);
}

.card-content {
    padding: 24px;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.card-meta {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 12px;
    color: var(--text-light);
    margin-bottom: 12px;
}

.card-tag {
    color: var(--accent);
    font-weight: 600;
}

.card h3 {
    font-size: 20px;
    margin-bottom: 12px;
    line-height: 1.35;
}

.card h3 a:hover {
    color: var(--accent);
}

.card-desc {
    color: var(--text-sub);
    font-size: 14px;
    margin-bottom: 20px;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.card-footer {
    margin-top: auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 13px;
    font-weight: 500;
}

.read-more {
    color: var(--accent);
    display: flex;
    align-items: center;
    gap: 4px;
}

/* Article Template Styles */
.article-header {
    padding: 64px 0 40px 0;
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.article-header .meta {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 16px;
    font-size: 14px;
    color: var(--text-sub);
    margin-bottom: 16px;
}

.article-header h1 {
    font-size: 32px;
    md-font-size: 44px;
    margin-bottom: 24px;
}

.article-hero {
    width: 100%;
    max-width: 800px;
    aspect-ratio: 16 / 9;
    border-radius: 16px;
    overflow: hidden;
    margin: 0 auto 48px auto;
    border: 1px solid var(--border);
}

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

.article-body {
    max-width: 680px;
    margin: 0 auto;
    font-size: 17px;
    line-height: 1.8;
}

.article-body p {
    margin-bottom: 24px;
}

.article-body h2 {
    font-size: 26px;
    margin: 40px 0 20px 0;
    border-bottom: 1px solid var(--border);
    padding-bottom: 8px;
}

.article-body h3 {
    font-size: 20px;
    margin: 32px 0 16px 0;
}

.article-body blockquote {
    border-left: 4px solid var(--accent);
    padding: 16px 24px;
    background-color: var(--bg-sub);
    margin: 32px 0;
    border-radius: 0 8px 8px 0;
    font-style: italic;
    color: var(--text-sub);
}

.article-body ul, .article-body ol {
    margin-bottom: 24px;
    padding-left: 20px;
}

.article-body li {
    margin-bottom: 8px;
}

.article-body code {
    background-color: var(--bg-sub);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: monospace;
    font-size: 15px;
}

/* Footer */
footer.site-footer {
    border-top: 1px solid var(--border);
    padding: 48px 0;
    background-color: var(--bg-sub);
    margin-top: 64px;
    font-size: 14px;
    color: var(--text-sub);
}

.footer-content {
    display: flex;
    flex-direction: column;
    md-flex-direction: row;
    justify-content: space-between;
    align-items: center;
    gap: 24px;
}

.footer-links {
    display: flex;
    gap: 24px;
}

/* Media Queries */
@media (max-width: 768px) {
    .nav-wrapper {
        height: 64px;
    }
    nav.main-nav {
        display: none; /* Can implement mobile drawer if needed, but keeping it minimalist */
    }
    .hero {
        padding: 60px 0 40px 0;
    }
    .hero h1 {
        font-size: 32px;
    }
    .hero p {
        font-size: 16px;
    }
    .article-header {
        padding: 40px 0 24px 0;
    }
    .article-header h1 {
        font-size: 28px;
    }
    .article-body {
        font-size: 16px;
    }
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
}