/* ═══════════════════════════════════════════════════════
   EV Atlas Blog — Premium Dark Theme
   ═══════════════════════════════════════════════════════ */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');

:root {
    --bg-primary: #0a0f1a;
    --bg-secondary: #111827;
    --bg-card: #1a2235;
    --bg-glass: rgba(17, 24, 39, 0.7);
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-tertiary: #64748b;
    --primary: #06b6d4;
    --accent: #3b82f6;
    --border-subtle: rgba(148, 163, 184, 0.1);
    --radius-lg: 16px;
    --radius-xl: 24px;
}

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

body {
    font-family: 'Inter', -apple-system, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.8;
    min-height: 100vh;
}

/* ═══════ Header ═══════ */
.blog-header {
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-subtle);
    padding: 16px 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.blog-header-inner {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.blog-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    font-weight: 800;
    font-size: 1.2rem;
    color: var(--text-primary);
}

.blog-logo span { font-size: 1.4rem; }

.blog-nav { display: flex; gap: 20px; }

.blog-nav a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: color 0.2s;
}

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

/* ═══════ Blog Index ═══════ */
.blog-hero {
    text-align: center;
    padding: 80px 24px 40px;
}

.blog-hero h1 {
    font-size: 2.8rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 12px;
}

.blog-hero p {
    color: var(--text-secondary);
    font-size: 1.15rem;
    max-width: 600px;
    margin: 0 auto;
}

.blog-grid {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 24px 80px;
    display: grid;
    grid-template-columns: 1fr;
    gap: 24px;
}

.blog-card {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    padding: 32px;
    text-decoration: none;
    color: inherit;
    transition: all 0.3s ease;
    display: block;
}

.blog-card:hover {
    border-color: rgba(6, 182, 212, 0.3);
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(6, 182, 212, 0.1);
}

.blog-card-tag {
    display: inline-block;
    font-size: 0.72rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--primary);
    background: rgba(6, 182, 212, 0.1);
    padding: 4px 12px;
    border-radius: 20px;
    margin-bottom: 12px;
}

.blog-card h2 {
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: 8px;
    line-height: 1.3;
}

.blog-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
    margin-bottom: 16px;
}

.blog-card-meta {
    display: flex;
    align-items: center;
    gap: 16px;
    font-size: 0.8rem;
    color: var(--text-tertiary);
}

/* ═══════ Blog Post ═══════ */
.blog-post {
    max-width: 750px;
    margin: 0 auto;
    padding: 60px 24px 100px;
}

.blog-post-header {
    margin-bottom: 40px;
}

.blog-post-tag {
    display: inline-block;
    font-size: 0.72rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--primary);
    background: rgba(6, 182, 212, 0.1);
    padding: 4px 12px;
    border-radius: 20px;
    margin-bottom: 16px;
}

.blog-post-header h1 {
    font-size: 2.4rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 16px;
    background: linear-gradient(135deg, var(--text-primary), var(--text-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.blog-post-meta {
    display: flex;
    align-items: center;
    gap: 16px;
    font-size: 0.85rem;
    color: var(--text-tertiary);
}

.blog-post h2 {
    font-size: 1.5rem;
    font-weight: 700;
    margin: 40px 0 16px;
    color: var(--text-primary);
}

.blog-post h3 {
    font-size: 1.2rem;
    font-weight: 600;
    margin: 28px 0 12px;
    color: var(--primary);
}

.blog-post p {
    margin-bottom: 20px;
    color: var(--text-secondary);
    font-size: 1.05rem;
}

.blog-post ul, .blog-post ol {
    margin: 0 0 20px 24px;
    color: var(--text-secondary);
}

.blog-post li { margin-bottom: 8px; font-size: 1.02rem; }

.blog-post strong { color: var(--text-primary); }

.blog-post a {
    color: var(--primary);
    text-decoration: none;
    border-bottom: 1px solid rgba(6, 182, 212, 0.3);
    transition: border-color 0.2s;
}

.blog-post a:hover { border-color: var(--primary); }

.blog-post blockquote {
    border-left: 3px solid var(--primary);
    padding: 16px 24px;
    margin: 24px 0;
    background: var(--bg-card);
    border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
    color: var(--text-secondary);
    font-style: italic;
}

.blog-post table {
    width: 100%;
    border-collapse: collapse;
    margin: 24px 0;
    font-size: 0.95rem;
}

.blog-post th, .blog-post td {
    padding: 12px 16px;
    text-align: left;
    border-bottom: 1px solid var(--border-subtle);
}

.blog-post th {
    color: var(--primary);
    font-weight: 600;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.blog-post td { color: var(--text-secondary); }

.blog-cta {
    background: linear-gradient(135deg, rgba(6, 182, 212, 0.15), rgba(59, 130, 246, 0.15));
    border: 1px solid rgba(6, 182, 212, 0.3);
    border-radius: var(--radius-xl);
    padding: 32px;
    text-align: center;
    margin: 40px 0;
}

.blog-cta h3 {
    color: var(--text-primary) !important;
    margin-bottom: 12px;
}

.blog-cta p { margin-bottom: 20px; }

.blog-cta-btn {
    display: inline-block;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: white;
    padding: 12px 32px;
    border-radius: 30px;
    font-weight: 600;
    text-decoration: none;
    transition: transform 0.2s, box-shadow 0.2s;
}

.blog-cta-btn:hover {
    transform: scale(1.05);
    box-shadow: 0 8px 30px rgba(6, 182, 212, 0.3);
    border: none;
}

/* ═══════ Footer ═══════ */
.blog-footer {
    text-align: center;
    padding: 40px 24px;
    border-top: 1px solid var(--border-subtle);
    color: var(--text-tertiary);
    font-size: 0.85rem;
}

/* ═══════ Responsive ═══════ */
@media (max-width: 640px) {
    .blog-hero h1 { font-size: 2rem; }
    .blog-post-header h1 { font-size: 1.8rem; }
    .blog-card { padding: 24px; }
    .blog-post { padding: 40px 16px 60px; }
}