/* ===================================
   CSS Variables & Design Tokens
   =================================== */
:root {
    /* Colors */
    --bg-primary: #0f0f0f;
    --bg-secondary: #1a1a1a;
    --bg-tertiary: #252525;
    --bg-card: rgba(255, 255, 255, 0.03);
    --bg-card-hover: rgba(255, 255, 255, 0.06);
    
    --text-primary: #ffffff;
    --text-secondary: rgba(255, 255, 255, 0.7);
    --text-muted: rgba(255, 255, 255, 0.5);
    
    --accent-primary: #ffffff;
    --accent-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --accent-blue: #3b82f6;
    --accent-purple: #8b5cf6;
    
    --border-color: rgba(255, 255, 255, 0.1);
    --border-hover: rgba(255, 255, 255, 0.2);
    
    /* Typography */
    --font-heading: 'DM Serif Display', serif;
    --font-body: 'Plus Jakarta Sans', sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 5rem;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 400ms ease;
    
    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
}

/* ===================================
   Reset & Base Styles
   =================================== */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

body {
    font-family: var(--font-body);
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-primary);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    color: inherit;
    text-decoration: none;
    transition: var(--transition-base);
}

ul {
    list-style: none;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

/* ===================================
   Utility Classes
   =================================== */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.section-title {
    font-family: var(--font-heading);
    font-size: clamp(2rem, 5vw, 3rem);
    margin-bottom: var(--spacing-sm);
    text-align: center;
}

.section-subtitle {
    color: var(--text-secondary);
    text-align: center;
    margin-bottom: var(--spacing-xl);
    font-size: 1.1rem;
}

/* ===================================
   Navigation
   =================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: var(--spacing-md) 0;
    background: transparent;
    transition: var(--transition-base);
}

.navbar.scrolled {
    background: rgba(15, 15, 15, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.nav-logo img {
    height: 40px;
    width: auto;
}

.nav-menu {
    display: flex;
    gap: var(--spacing-lg);
}

.nav-link {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-secondary);
    position: relative;
    padding: var(--spacing-xs) 0;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent-primary);
    transition: var(--transition-base);
}

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

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 5px;
}

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

/* ===================================
   Hero Section
   =================================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 120px 0 var(--spacing-2xl);
    position: relative;
    overflow: hidden;
    background: var(--bg-primary);
}

.hero-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.hero-content {
    position: relative;
    z-index: 2;
}

.hero-title {
    font-family: var(--font-heading);
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 400;
    line-height: 1.1;
    margin-bottom: var(--spacing-lg);
}

.hero-title .title-line {
    display: block;
}

.hero-intro {
    display: flex;
    align-items: baseline;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.hero-name {
    font-size: 1.25rem;
    font-weight: 600;
}

.hero-role {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.hero-description {
    color: var(--text-secondary);
    font-size: 1rem;
    line-height: 1.7;
    margin-bottom: var(--spacing-lg);
    max-width: 500px;
}

.hero-links {
    display: flex;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
}

.hero-link {
    font-size: 0.95rem;
    text-decoration: underline;
    text-underline-offset: 4px;
    color: var(--text-primary);
}

.hero-link:hover {
    color: var(--text-secondary);
}

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

.hero-tag {
    font-size: 0.85rem;
    padding: var(--spacing-xs) var(--spacing-sm);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
}

.hero-tag:hover {
    border-color: var(--border-hover);
    color: var(--text-primary);
}

/* Hero Image */
.hero-image-wrapper {
    position: relative;
    display: flex;
    justify-content: flex-end;
    align-items: center;
}

.hero-image-container {
    position: relative;
    width: 100%;
    max-width: 450px;
}

.hero-image {
    position: relative;
    z-index: 2;
    width: 100%;
    height: auto;
    object-fit: contain;
}

.hero-stripes {
    position: absolute;
    top: 0;
    right: -20px;
    bottom: 0;
    width: 150px;
    background: repeating-linear-gradient(
        -55deg,
        transparent,
        transparent 8px,
        rgba(255, 255, 255, 0.08) 8px,
        rgba(255, 255, 255, 0.08) 16px
    );
    z-index: 1;
}

/* ===================================
   About Section
   =================================== */
.about {
    padding: var(--spacing-2xl) 0;
    background: var(--bg-secondary);
}

.about-content {
    display: grid;
    grid-template-columns: 350px 1fr;
    gap: var(--spacing-xl);
    align-items: start;
    margin-top: var(--spacing-xl);
}

.about-image-container {
    position: relative;
}

.about-image {
    width: 100%;
    height: 450px;
    object-fit: cover;
    border-radius: var(--radius-lg);
}

.about-image-decoration {
    position: absolute;
    top: 20px;
    left: 20px;
    right: -20px;
    bottom: -20px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    z-index: -1;
}

.about-description {
    color: var(--text-secondary);
    font-size: 1.05rem;
    line-height: 1.8;
    margin-bottom: var(--spacing-md);
}

.about-details {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.detail-card {
    padding: var(--spacing-md);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    transition: var(--transition-base);
}

.detail-card:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-hover);
}

.detail-label {
    display: block;
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: var(--spacing-xs);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.detail-value {
    font-size: 1rem;
    line-height: 1.5;
}

.detail-value small {
    color: var(--text-muted);
    font-size: 0.75rem;
    margin-left: 4px;
}

/* ===================================
   Projects Section
   =================================== */
.projects {
    padding: var(--spacing-2xl) 0;
    background: var(--bg-primary);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.project-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    transition: var(--transition-base);
    position: relative;
    overflow: hidden;
}

.project-card:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-hover);
    transform: translateY(-4px);
}

.project-card.featured {
    grid-column: span 2;
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.1), rgba(139, 92, 246, 0.1));
    border-color: rgba(139, 92, 246, 0.3);
}

.project-card.featured:hover {
    border-color: rgba(139, 92, 246, 0.5);
}

.project-badge {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    padding: var(--spacing-xs) var(--spacing-sm);
    background: linear-gradient(135deg, #fbbf24, #f59e0b);
    color: #000;
    font-size: 0.8rem;
    font-weight: 600;
    border-radius: var(--radius-full);
}

.project-content {
    position: relative;
    z-index: 1;
}

.project-title {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
}

.project-description {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.7;
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-md);
}

.tech-tag {
    padding: 4px 12px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-full);
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.project-links {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.project-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.project-link:hover {
    border-color: var(--text-primary);
    color: var(--text-primary);
}

.project-link.primary {
    background: var(--text-primary);
    color: var(--bg-primary);
    border-color: transparent;
}

.project-link.primary:hover {
    background: var(--text-secondary);
}

/* ===================================
   Skills Section
   =================================== */
.skills {
    padding: var(--spacing-2xl) 0;
    background: var(--bg-secondary);
}

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

.skill-category-title {
    font-family: var(--font-heading);
    font-size: 1.3rem;
    margin-bottom: var(--spacing-md);
}

.skill-items {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.skill-item {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.skill-name {
    font-size: 0.95rem;
    font-weight: 500;
}

.skill-bar {
    height: 8px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.skill-progress {
    height: 100%;
    width: var(--progress, 0%);
    background: var(--accent-gradient);
    border-radius: var(--radius-full);
    transition: width 1s ease-out;
}

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

.skill-badge {
    padding: 10px 20px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    transition: var(--transition-base);
}

.skill-badge:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-hover);
}

/* ===================================
   Certifications Section
   =================================== */
.certifications {
    padding: var(--spacing-2xl) 0;
    background: var(--bg-primary);
}

.certifications-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.certification-card {
    padding: var(--spacing-lg);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    text-align: center;
    transition: var(--transition-base);
}

.certification-card:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-hover);
    transform: translateY(-4px);
}

.certification-icon {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-sm);
}

.certification-title {
    font-family: var(--font-heading);
    font-size: 1.3rem;
    margin-bottom: var(--spacing-xs);
}

.certification-issuer {
    color: var(--accent-blue);
    font-size: 0.9rem;
    margin-bottom: var(--spacing-xs);
}

.certification-description {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* ===================================
   Contact Section
   =================================== */
.contact {
    padding: var(--spacing-2xl) 0;
    background: var(--bg-secondary);
}

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

.contact-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-lg);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    text-align: center;
    transition: var(--transition-base);
}

.contact-card:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-hover);
    transform: translateY(-4px);
}

.contact-icon {
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-tertiary);
    border-radius: var(--radius-full);
}

.contact-label {
    font-size: 0.85rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.contact-value {
    font-size: 0.95rem;
    color: var(--text-primary);
}

/* ===================================
   Footer
   =================================== */
.footer {
    padding: var(--spacing-lg) 0;
    background: var(--bg-primary);
    border-top: 1px solid var(--border-color);
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
    text-align: center;
}

.footer-text {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.footer-tagline {
    font-family: var(--font-heading);
    font-size: 1.1rem;
    font-style: italic;
    color: var(--text-secondary);
}

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

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.animate-on-scroll.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ===================================
   Responsive Design
   =================================== */
@media (max-width: 1024px) {
    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-content {
        order: 2;
    }
    
    .hero-image-wrapper {
        order: 1;
        justify-content: center;
        margin-bottom: var(--spacing-lg);
    }
    
    .hero-image-container {
        max-width: 350px;
    }
    
    .hero-intro {
        justify-content: center;
    }
    
    .hero-description {
        margin-left: auto;
        margin-right: auto;
    }
    
    .hero-links,
    .hero-tags {
        justify-content: center;
    }
    
    .about-content {
        grid-template-columns: 1fr;
    }
    
    .about-image-container {
        max-width: 400px;
        margin: 0 auto;
    }
    
    .about-image {
        height: 400px;
    }
    
    .project-card.featured {
        grid-column: span 1;
    }
    
    .skills-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    :root {
        --spacing-2xl: 3rem;
    }
    
    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 280px;
        height: 100vh;
        background: var(--bg-secondary);
        flex-direction: column;
        padding: 100px var(--spacing-lg) var(--spacing-lg);
        transition: var(--transition-base);
        border-left: 1px solid var(--border-color);
    }
    
    .nav-menu.active {
        right: 0;
    }
    
    .nav-toggle {
        display: flex;
        z-index: 1001;
    }
    
    .nav-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }
    
    .nav-toggle.active span:nth-child(2) {
        opacity: 0;
    }
    
    .nav-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -5px);
    }
    
    .hero-title {
        font-size: clamp(2rem, 8vw, 3rem);
    }
    
    .hero-links {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .about-details {
        grid-template-columns: 1fr;
    }
    
    .about-image {
        height: 350px;
    }
    
    .contact-links {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .hero-tags {
        flex-direction: column;
        align-items: center;
    }
    
    .project-links {
        flex-direction: column;
    }
    
    .project-link {
        justify-content: center;
    }
}