/* ============================================
   ZERO BLOG - BLACK & WHITE THEME
   Matches Portfolio Style
   ============================================ */

:root {
    --black: #000000;
    --white: #ffffff;
    --gray-100: #f5f5f5;
    --gray-200: #eaeaea;
    --gray-300: #cccccc;
    --gray-400: #999999;
    --gray-500: #666666;
    --gray-600: #444444;
    --gray-700: #333333;
    --gray-800: #222222;
    --transition: all 0.3s ease;
    --shadow: 0 5px 20px rgba(0,0,0,0.1);
    --shadow-hover: 0 10px 30px rgba(0,0,0,0.2);
    --border-radius: 12px;
}

[data-theme="dark"] {
    --black: #ffffff;
    --white: #000000;
    --gray-100: #111111;
    --gray-200: #222222;
    --gray-300: #333333;
    --gray-400: #666666;
    --gray-500: #999999;
    --gray-600: #cccccc;
    --gray-700: #eaeaea;
    --gray-800: #f5f5f5;
    --shadow: 0 5px 20px rgba(255,255,255,0.05);
    --shadow-hover: 0 10px 30px rgba(255,255,255,0.1);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--white);
    color: var(--gray-600);
    line-height: 1.6;
    transition: var(--transition);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Loading Screen */
.loading-screen {
    position: fixed;
    inset: 0;
    background: var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1040;
    transition: opacity 0.5s;
}

.loading-screen.hidden {
    opacity: 0;
    pointer-events: none;
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: var(--white);
    border-bottom: 1px solid var(--gray-200);
    backdrop-filter: blur(10px);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
}

.brand-icon {
    width: 40px;
    height: 40px;
    background: var(--black);
    color: var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    font-weight: 700;
    font-size: 18px;
}

.brand-text {
    font-weight: 700;
    font-size: 20px;
    color: var(--black);
}

.nav-menu {
    display: flex;
    gap: 4px;
    align-items: center;
}

.nav-link {
    text-decoration: none;
    color: var(--gray-500);
    font-size: 13px;
    font-weight: 500;
    padding: 8px 12px;
    border-radius: 8px;
    transition: var(--transition);
}

.nav-link:hover {
    color: var(--black);
    background: var(--gray-100);
}

.nav-link.active {
    color: var(--black);
    background: var(--gray-100);
    font-weight: 600;
}

.nav-controls {
    display: flex;
    align-items: center;
    gap: 8px;
}

.theme-toggle {
    width: 40px;
    height: 40px;
    background: var(--black);
    color: var(--white);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    transition: var(--transition);
}

.theme-toggle:hover {
    transform: scale(1.1);
}

.nav-toggle {
    display: none;
    width: 40px;
    height: 40px;
    background: transparent;
    border: none;
    cursor: pointer;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 5px;
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--black);
    transition: var(--transition);
}

/* Blog Header */
.blog-header {
    padding: 140px 0 60px;
    background: var(--white);
    text-align: center;
}

.section-tag {
    display: inline-block;
    font-size: 14px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--black);
    background: var(--gray-100);
    padding: 6px 16px;
    border-radius: 20px;
    margin-bottom: 16px;
}

.blog-title {
    font-size: 56px;
    font-weight: 800;
    color: var(--black);
    margin-bottom: 16px;
    line-height: 1.1;
}

.blog-title span {
    color: var(--gray-400);
}

.blog-subtitle {
    font-size: 18px;
    color: var(--gray-400);
    max-width: 500px;
    margin: 0 auto;
}

/* Blog Grid */
.blog-main {
    padding: 40px 0 80px;
}

.blog-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

/* Blog Card */
.blog-card {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--border-radius);
    overflow: hidden;
    transition: var(--transition);
    text-decoration: none;
    display: flex;
    flex-direction: column;
}

.blog-card:hover {
    border-color: var(--black);
    box-shadow: var(--shadow-hover);
    transform: translateY(-5px);
}

.blog-card-thumbnail {
    width: 100%;
    height: 200px;
    background: var(--gray-100);
    overflow: hidden;
    position: relative;
}

.blog-card-thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.blog-card-thumbnail .no-image {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 48px;
    color: var(--black);
}

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

.blog-card-category {
    display: inline-block;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--black);
    background: var(--gray-100);
    padding: 4px 10px;
    border-radius: 12px;
    margin-bottom: 12px;
    align-self: flex-start;
}

.blog-card-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--black);
    margin-bottom: 8px;
    line-height: 1.3;
}

.blog-card-excerpt {
    font-size: 14px;
    color: var(--gray-500);
    margin-bottom: 16px;
    flex: 1;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.blog-card-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 12px;
    color: var(--gray-400);
    border-top: 1px solid var(--gray-200);
    padding-top: 16px;
}

.blog-card-date {
    display: flex;
    align-items: center;
    gap: 6px;
}

.blog-card-read {
    display: flex;
    align-items: center;
    gap: 4px;
    font-weight: 600;
    color: var(--black);
}

/* Skeleton Loading */
.skeleton-card {
    height: 350px;
    background: var(--gray-100);
    border-radius: var(--border-radius);
    animation: pulse 1.5s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* Error State */
.blog-error {
    text-align: center;
    padding: 60px 20px;
}

.blog-error i {
    font-size: 48px;
    color: var(--gray-300);
    margin-bottom: 16px;
}

.blog-error h3 {
    font-size: 24px;
    font-weight: 700;
    color: var(--black);
    margin-bottom: 8px;
}

.blog-error p {
    font-size: 16px;
    color: var(--gray-400);
    margin-bottom: 24px;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
    border: 2px solid transparent;
}

.btn-primary {
    background: var(--black);
    color: var(--white);
    border-color: var(--black);
}

.btn-primary:hover {
    background: var(--gray-700);
    border-color: var(--gray-700);
    transform: translateY(-2px);
}

/* Footer */
.footer {
    background: var(--black);
    color: var(--white);
    padding: 40px 0;
    text-align: center;
}

.footer-content {
    margin-bottom: 24px;
}

.footer-brand {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    margin-bottom: 16px;
}

.footer-brand .brand-icon {
    background: var(--white);
    color: var(--black);
}

.footer-brand .brand-text {
    color: var(--white);
}

.footer-text {
    color: var(--gray-300);
    margin-bottom: 16px;
}

.footer-links {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 24px;
}

.footer-links a {
    color: var(--white);
    text-decoration: none;
    font-size: 14px;
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--gray-300);
}

.footer-bottom {
    border-top: 1px solid var(--gray-700);
    padding-top: 16px;
    color: var(--gray-400);
    font-size: 14px;
}

.footer-bottom .fa-heart {
    color: var(--white);
}

/* Back to Top */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--black);
    color: var(--white);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    font-size: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 999;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

/* Responsive */
@media (max-width: 1024px) {
    .blog-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .blog-title {
        font-size: 40px;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        right: 0;
        background: var(--white);
        border-bottom: 1px solid var(--gray-200);
        flex-direction: column;
        padding: 16px 24px;
    }
    
    .nav-menu.active {
        display: flex;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .blog-grid {
        grid-template-columns: 1fr;
    }
    
    .blog-title {
        font-size: 32px;
    }
    
    .blog-header {
        padding: 100px 0 40px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }
    
    .blog-title {
        font-size: 28px;
    }
    
    .blog-subtitle {
        font-size: 16px;
    }
}