/* ===== CSS RESET & VARIABLES ===== */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    /* Colors - Light Theme */
    --color-primary: #435663;
    --color-primary-hover: #313647;
    --color-accent: #A3B087;
    --color-text: #313647;
    --color-text-secondary: #435663;
    --color-text-muted: #6b7280;
    --color-background: #FFF8D4;
    --color-surface: #ffffff;
    --color-border: #e5e7eb;
    --color-border-light: #f3f4f6;
    
    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', Consolas, monospace;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-normal: 250ms ease-in-out;
    --transition-slow: 350ms ease-in-out;
    
    /* Container */
    --container-width: 1200px;
    --content-width: 800px;
}

/* Dark Theme */
[data-theme="dark"] {
    --color-primary: #A3B087;
    --color-primary-hover: #8a9670;
    --color-accent: #FFF8D4;
    --color-text: #FFF8D4;
    --color-text-secondary: #A3B087;
    --color-text-muted: #9ca3af;
    --color-background: #313647;
    --color-surface: #435663;
    --color-border: #435663;
    --color-border-light: #313647;
}

/* ===== BASE STYLES ===== */
html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-background);
    transition: color var(--transition-normal), background-color var(--transition-normal);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ===== CONTAINER & LAYOUT ===== */
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ===== HEADER & NAVIGATION ===== */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background-color: var(--color-background);
    border-bottom: 1px solid var(--color-border);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    transition: all var(--transition-normal);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) 0;
}

.nav-brand .logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-text);
    text-decoration: none;
}

.logo-icon {
    font-family: var(--font-mono);
    color: var(--color-primary);
    font-size: 1.25rem;
}

.logo-text {
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--spacing-xl);
    list-style: none;
}

.nav-link {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-weight: 500;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    position: relative;
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-primary);
    background-color: var(--color-surface);
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 4px;
    background-color: var(--color-primary);
    border-radius: 50%;
}

.theme-toggle {
    background: none;
    border: 1px solid var(--color-border);
    width: 36px;
    height: 36px;
    border-radius: 50%;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    color: var(--color-text-secondary);
    outline: none;
}

.theme-toggle:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
    background: var(--color-surface);
}

/* ===== MAIN CONTENT ===== */
.main {
    flex: 1;
    padding: var(--spacing-2xl) 0;
}

/* ===== HERO SECTION ===== */
.hero {
    text-align: center;
    padding: var(--spacing-3xl) 0;
    margin-bottom: var(--spacing-3xl);
}

.hero-content {
    max-width: var(--content-width);
    margin: 0 auto;
}

.hero-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: var(--spacing-lg);
    color: var(--color-text);
}

.highlight {
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    position: relative;
}

.highlight::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    border-radius: var(--radius-sm);
    opacity: 0.3;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-2xl);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-cta {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

/* ===== BUTTONS ===== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    font-weight: 600;
    text-decoration: none;
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
    cursor: pointer;
    border: none;
    font-size: 1rem;
    white-space: nowrap;
}

.btn-primary {
    background: var(--color-primary);
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: var(--color-surface);
    color: var(--color-text);
    border: 1px solid var(--color-border);
}

.btn-secondary:hover {
    background: var(--color-background);
    border-color: var(--color-primary);
    color: var(--color-primary);
    transform: translateY(-1px);
}

/* ===== SECTIONS ===== */
.section-header {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* ===== POSTS GRID ===== */
.posts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-2xl);
}

.post-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.post-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    transform: scaleX(0);
    transition: transform var(--transition-normal);
}

.post-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
    border-color: var(--color-primary);
}

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

.post-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-md);
}

.post-tag {
    background: var(--color-primary);
    color: white;
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.025em;
}

.post-date {
    color: var(--color-text-muted);
    font-size: 0.875rem;
    font-family: var(--font-mono);
}

.post-title {
    margin-bottom: var(--spacing-md);
}

.post-title a {
    color: var(--color-text);
    text-decoration: none;
    font-size: 1.25rem;
    font-weight: 600;
    line-height: 1.3;
    transition: color var(--transition-fast);
}

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

.post-excerpt {
    color: var(--color-text-secondary);
    line-height: 1.6;
    margin-bottom: var(--spacing-lg);
}

.post-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--color-border-light);
}

.read-time {
    color: var(--color-text-muted);
    font-size: 0.875rem;
    font-family: var(--font-mono);
}

.read-more {
    color: var(--color-primary);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.875rem;
    transition: all var(--transition-fast);
}

.read-more:hover {
    color: var(--color-primary-hover);
    transform: translateX(2px);
}

/* ===== FOOTER ===== */
.footer {
    background: var(--color-surface);
    border-top: 1px solid var(--color-border);
    margin-top: var(--spacing-3xl);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
    padding: var(--spacing-3xl) 0 var(--spacing-xl) 0;
}

.footer-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
    padding-left: var(--spacing-md);
}

.footer-subtitle {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
}

.footer-text {
    color: var(--color-text-secondary);
    line-height: 1.6;
    padding-left: var(--spacing-md);
}

.social-links {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    color: var(--color-text-secondary);
    background: var(--color-background);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.social-link:hover {
    color: var(--color-primary);
    border-color: var(--color-primary);
    transform: translateY(-2px);
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: var(--spacing-sm);
}

.footer-link {
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.footer-link:hover {
    color: var(--color-primary);
}

.footer-bottom {
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-lg) 0;
    text-align: center;
    color: var(--color-text-muted);
}

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 768px) {
    .container {
        padding: 0 var(--spacing-md);
    }
    
    .nav {
        flex-direction: column;
        gap: var(--spacing-md);
        padding: var(--spacing-lg) 0;
    }
    
    .nav-links {
        gap: var(--spacing-lg);
    }
    
    .hero {
        padding: var(--spacing-xl) 0;
        margin-bottom: var(--spacing-xl);
    }
    
    .hero-cta {
        flex-direction: column;
        align-items: center;
    }
    
    .btn {
        width: 100%;
        max-width: 280px;
        justify-content: center;
    }
    
    .posts-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    .post-card {
        padding: var(--spacing-lg);
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
        text-align: center;
    }
    
    .social-links {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .nav-links {
        flex-wrap: wrap;
        justify-content: center;
    }
}

/* ===== ANIMATIONS ===== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.post-card {
    animation: fadeInUp 0.6s ease-out;
}

.post-card:nth-child(1) { animation-delay: 0.1s; }
.post-card:nth-child(2) { animation-delay: 0.2s; }
.post-card:nth-child(3) { animation-delay: 0.3s; }
.post-card:nth-child(4) { animation-delay: 0.4s; }
.post-card:nth-child(5) { animation-delay: 0.5s; }
.post-card:nth-child(6) { animation-delay: 0.6s; }

/* ===== ACCESSIBILITY ===== */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    html {
        scroll-behavior: auto;
    }
}

/* Focus styles */
.nav-link:focus,
.btn:focus,
.theme-toggle:focus,
.social-link:focus,
.footer-link:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* ===== ABOUT PAGE STYLES ===== */
.about-hero {
    text-align: center;
    padding: var(--spacing-3xl) 0;
    margin-bottom: var(--spacing-3xl);
}

.about-content {
    max-width: var(--content-width);
    margin: 0 auto;
}

.profile-image {
    margin-bottom: var(--spacing-xl);
}

.avatar {
    width: 120px;
    height: 120px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto;
    box-shadow: var(--shadow-lg);
    position: relative;
}

.avatar::before {
    content: '';
    position: absolute;
    top: -4px;
    left: -4px;
    right: -4px;
    bottom: -4px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    border-radius: 50%;
    z-index: -1;
    opacity: 0.3;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 0.3; }
    50% { transform: scale(1.05); opacity: 0.1; }
}

.avatar-text {
    font-size: 2.5rem;
    font-weight: 700;
    color: white;
    font-family: var(--font-mono);
}

.about-title {
    font-size: clamp(2.5rem, 5vw, 3.5rem);
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    color: var(--color-text);
}

.about-subtitle {
    font-size: 1.25rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
    max-width: 600px;
    margin: 0 auto;
}

.about-details {
    margin-bottom: var(--spacing-3xl);
}

.details-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: var(--spacing-2xl);
    max-width: var(--container-width);
    margin: 0 auto;
}

.detail-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    transition: all var(--transition-normal);
}

.detail-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.detail-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    color: var(--color-text);
}

.detail-text {
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: var(--spacing-lg);
}

.detail-text:last-child {
    margin-bottom: 0;
}

.specialty-list {
    list-style: none;
    padding: 0;
}

.specialty-item {
    margin-bottom: var(--spacing-lg);
    color: var(--color-text-secondary);
    line-height: 1.6;
}

.specialty-item strong {
    color: var(--color-primary);
    font-weight: 600;
}

/* Skills Section */
.skills-section {
    margin-bottom: var(--spacing-3xl);
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-2xl);
}

.skill-category {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
}

.skill-category-title {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
    color: var(--color-text);
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.skill-tag {
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 500;
    transition: all var(--transition-fast);
}

.skill-tag.expert {
    background: var(--color-primary);
    color: white;
}

.skill-tag.advanced {
    background: var(--color-background);
    color: var(--color-primary);
    border: 1px solid var(--color-primary);
}

.skill-tag.intermediate {
    background: var(--color-background);
    color: var(--color-text-secondary);
    border: 1px solid var(--color-border);
}

.skill-tag:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

/* Experience Section */
.experience-section {
    margin-bottom: var(--spacing-3xl);
}

.timeline {
    max-width: 800px;
    margin: var(--spacing-2xl) auto 0;
    position: relative;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 30px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--color-border);
}

.timeline-item {
    position: relative;
    margin-bottom: var(--spacing-2xl);
    padding-left: 80px;
}

.timeline-marker {
    position: absolute;
    left: 21px;
    top: 8px;
    width: 18px;
    height: 18px;
    background: var(--color-primary);
    border-radius: 50%;
    border: 3px solid var(--color-background);
    box-shadow: 0 0 0 3px var(--color-border);
}

.timeline-content {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
}

.job-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--spacing-sm);
}

.job-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.company {
    color: var(--color-primary);
    font-weight: 500;
}

.duration {
    color: var(--color-text-muted);
    font-size: 0.875rem;
    font-family: var(--font-mono);
}

.job-description {
    color: var(--color-text-secondary);
    line-height: 1.6;
    margin-bottom: var(--spacing-lg);
}

.job-technologies {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.tech-tag {
    background: var(--color-background);
    color: var(--color-text-secondary);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-md);
    font-size: 0.8rem;
    font-weight: 500;
    border: 1px solid var(--color-border);
}

/* Certifications Section */
.certifications-section {
    margin-bottom: var(--spacing-3xl);
}

.certifications-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-2xl);
}

.cert-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    text-align: center;
    transition: all var(--transition-normal);
}

.cert-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.cert-icon {
    font-size: 2rem;
    margin-bottom: var(--spacing-md);
}

.cert-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--spacing-sm);
    line-height: 1.4;
}

.cert-date {
    color: var(--color-text-muted);
    font-size: 0.875rem;
    font-family: var(--font-mono);
}

.cert-subtitle {
    color: var(--color-text-secondary);
    font-size: 0.8rem;
    margin-top: var(--spacing-xs);
    font-style: italic;
    line-height: 1.3;
}

/* Contact Section */
.contact-section {
    margin-bottom: var(--spacing-2xl);
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-2xl);
}

.contact-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    text-align: center;
    text-decoration: none;
    color: var(--color-text);
    transition: all var(--transition-normal);
    display: block;
}

.contact-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    border-color: var(--color-primary);
    color: var(--color-text);
}

.contact-icon {
    font-size: 2rem;
    margin-bottom: var(--spacing-md);
}

.contact-card h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text);
}

.contact-card p {
    color: var(--color-text-secondary);
    font-size: 0.875rem;
    margin: 0;
}

.contact-card:hover p {
    color: var(--color-primary);
}

/* Logo link fix for about page */
.logo a {
    color: inherit;
    text-decoration: none;
}

/* Responsive Design for About Page */
@media (max-width: 768px) {
    .details-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    .skills-grid {
        grid-template-columns: 1fr;
    }
    
    .timeline {
        margin-left: var(--spacing-lg);
    }
    
    .timeline::before {
        left: 15px;
    }
    
    .timeline-item {
        padding-left: 50px;
    }
    
    .timeline-marker {
        left: 6px;
    }
    
    .job-meta {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .certifications-grid {
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    }
    
    .contact-grid {
        grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    }
}

@media (max-width: 480px) {
    .about-title {
        font-size: 2rem;
    }
    
    .avatar {
        width: 100px;
        height: 100px;
    }
    
    .avatar-text {
        font-size: 2rem;
    }
    
    .detail-card,
    .timeline-content {
        padding: var(--spacing-lg);
    }
}

/* ===== PRINT STYLES ===== */
@media print {
    .header,
    .footer,
    .theme-toggle,
    .hero-cta {
        display: none;
    }
    
    .post-card {
        break-inside: avoid;
        box-shadow: none;
        border: 1px solid #ccc;
    }
}