/* ===== CSS Variables & Reset ===== */
:root {
    /* Colors */
    --color-bg: #0a0a0a;
    --color-bg-secondary: #111111;
    --color-surface: rgba(255, 255, 255, 0.05);
    --color-surface-hover: rgba(255, 255, 255, 0.08);
    --color-text-primary: #ffffff;
    --color-text-secondary: #a1a1a1;
    --color-text-muted: #737373;
    --color-accent-cyan: #06b6d4;
    --color-accent-purple: #a855f7;
    --color-accent-pink: #ec4899;
    --color-border: rgba(255, 255, 255, 0.1);
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, var(--color-accent-cyan), var(--color-accent-purple));
    --gradient-secondary: linear-gradient(135deg, var(--color-accent-purple), var(--color-accent-pink));
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 0.75rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-size-xs: 0.875rem;
    --font-size-sm: 1rem;
    --font-size-md: 1.125rem;
    --font-size-lg: 1.5rem;
    --font-size-xl: 2rem;
    --font-size-2xl: 2.5rem;
    --font-size-3xl: 3.5rem;
    
    /* Border Radius */
    --radius-sm: 0.5rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    
    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
}

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

::selection {
    background-color: var(--color-accent-cyan);
    color: var(--color-bg);
}

/* ===== Navigation ===== */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: var(--spacing-lg) 0;
    transition: all var(--transition-base);
}

.nav.scrolled {
    background-color: rgba(10, 10, 10, 0.8);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
}

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

.nav-logo {
    font-size: var(--font-size-md);
    font-weight: 600;
    color: var(--color-text-primary);
    text-decoration: none;
    letter-spacing: -0.02em;
}

.nav-links {
    display: flex;
    gap: var(--spacing-xl);
}

.nav-link {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: var(--font-size-sm);
    font-weight: 500;
    transition: color var(--transition-fast);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: width var(--transition-base);
}

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

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

/* ===== Container ===== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-xl);
}

/* ===== Hero Section ===== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: var(--spacing-3xl) 0;
}

.hero-title {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    letter-spacing: -0.03em;
    margin-bottom: var(--spacing-lg);
    line-height: 1.1;
    opacity: 0;
    animation: fadeInUp 0.8s ease-out forwards;
}

.hero-description {
    font-size: var(--font-size-md);
    color: var(--color-text-secondary);
    max-width: 700px;
    margin-bottom: var(--spacing-2xl);
    line-height: 1.7;
    opacity: 0;
    animation: fadeInUp 0.8s ease-out 0.2s forwards;
}

.hero-cta {
    margin-bottom: var(--spacing-2xl);
}

.hero-looking {
    font-size: var(--font-size-sm);
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-md);
    font-weight: 500;
}

.hero-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.hero-list li {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.hero-list li::before {
    content: '•';
    color: var(--color-accent-cyan);
    font-size: var(--font-size-lg);
}

.hero-list a {
    color: var(--color-text-primary);
    text-decoration: underline;
    text-decoration-color: var(--color-accent-cyan);
    text-decoration-thickness: 2px;
    text-underline-offset: 4px;
    transition: all var(--transition-fast);
}

.hero-list a:hover {
    color: var(--color-accent-cyan);
}

.hero-interests {
    margin-bottom: var(--spacing-2xl);
    padding: var(--spacing-xl);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    backdrop-filter: blur(8px);
    opacity: 0;
    animation: fadeInUp 0.8s ease-out 0.4s forwards, float 6s ease-in-out 1.2s infinite;
}

.interests-title {
    font-size: var(--font-size-sm);
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-md);
    font-weight: 500;
}

.interests-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.interests-list li {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
}

.interests-list li::before {
    content: '→';
    color: var(--color-accent-purple);
    margin-top: 2px;
    flex-shrink: 0;
}

.hero-current {
    margin-bottom: var(--spacing-2xl);
    padding: var(--spacing-xl);
    background: rgba(6, 182, 212, 0.1);
    border: 1px solid var(--color-accent-cyan);
    border-radius: var(--radius-lg);
    backdrop-filter: blur(8px);
}

.current-title {
    font-size: var(--font-size-md);
    color: var(--color-accent-cyan);
    margin-bottom: var(--spacing-md);
    font-weight: 600;
}

.current-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.current-list li {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    color: var(--color-text-primary);
    font-size: var(--font-size-md);
    font-weight: 500;
}

.current-list li::before {
    content: '▸';
    color: var(--color-accent-cyan);
    margin-top: 2px;
    flex-shrink: 0;
    font-weight: 700;
}

.hero-contact {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    max-width: 700px;
    opacity: 0;
    animation: fadeInUp 0.8s ease-out 0.6s forwards;
}

.contact-link {
    color: var(--color-text-primary);
    text-decoration: underline;
    text-decoration-color: var(--color-accent-cyan);
    text-decoration-thickness: 2px;
    text-underline-offset: 4px;
    transition: all var(--transition-fast);
}

.contact-link:hover {
    color: var(--color-accent-cyan);
}

/* ===== Section Styles ===== */
section {
    padding: var(--spacing-3xl) 0;
}

.section-title {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    margin-bottom: var(--spacing-2xl);
    letter-spacing: -0.02em;
}

/* ===== Education Timeline ===== */
.timeline {
    position: relative;
    padding-left: var(--spacing-xl);
}

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 8px;
    bottom: 8px;
    width: 2px;
    background: linear-gradient(180deg, var(--color-accent-cyan), var(--color-accent-purple));
}

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

.timeline-item:last-child {
    margin-bottom: 0;
}

.timeline-marker {
    position: absolute;
    left: calc(-1 * var(--spacing-xl) - 6px);
    top: 6px;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--gradient-primary);
    box-shadow: 0 0 0 4px var(--color-bg);
}

.timeline-year {
    font-size: var(--font-size-xs);
    color: var(--color-accent-cyan);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--spacing-xs);
}

.timeline-title {
    font-size: var(--font-size-md);
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.timeline-subtitle {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

/* ===== Experience Section ===== */
.experience-grid {
    display: grid;
    gap: var(--spacing-xl);
}

.experience-card {
    padding: var(--spacing-xl);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
    backdrop-filter: blur(8px);
}

.experience-card:hover {
    background: var(--color-surface-hover);
    border-color: rgba(255, 255, 255, 0.15);
    transform: translateY(-2px);
}

.experience-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--spacing-sm);
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.experience-title {
    font-size: var(--font-size-md);
    font-weight: 600;
}

.experience-date {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
    font-weight: 500;
}

.experience-company {
    font-size: var(--font-size-sm);
    color: var(--color-accent-cyan);
    font-weight: 500;
    margin-bottom: var(--spacing-md);
}

.experience-badge {
    margin-bottom: var(--spacing-md);
}

.badge-link {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-md);
    background: rgba(6, 182, 212, 0.1);
    color: var(--color-accent-cyan);
    border: 1px solid rgba(6, 182, 212, 0.3);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-xs);
    font-weight: 500;
    text-decoration: none;
    transition: all var(--transition-fast);
}

.badge-link:hover {
    background: rgba(6, 182, 212, 0.2);
    border-color: var(--color-accent-cyan);
}

.experience-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.experience-list li {
    display: flex;
    gap: var(--spacing-sm);
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    line-height: 1.6;
}

.experience-list li::before {
    content: '→';
    color: var(--color-accent-purple);
    margin-top: 2px;
    flex-shrink: 0;
}

/* ===== Projects Section ===== */
.projects {
    background: var(--color-bg-secondary);
}

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

.project-card {
    padding: var(--spacing-xl);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
    backdrop-filter: blur(8px);
    display: flex;
    flex-direction: column;
}

.project-card:hover {
    background: var(--color-surface-hover);
    border-color: rgba(255, 255, 255, 0.15);
    transform: translateY(-4px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}

.project-card.featured {
    background: rgba(6, 182, 212, 0.05);
    border: 2px solid var(--color-accent-cyan);
}

.project-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--spacing-md);
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.project-title {
    font-size: var(--font-size-md);
    font-weight: 600;
    flex: 1;
}

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

.project-link {
    color: var(--color-accent-cyan);
    text-decoration: none;
    font-size: var(--font-size-xs);
    font-weight: 500;
    transition: all var(--transition-fast);
    padding: var(--spacing-xs) var(--spacing-sm);
    border: 1px solid rgba(6, 182, 212, 0.3);
    border-radius: var(--radius-sm);
}

.project-link:hover {
    background: rgba(6, 182, 212, 0.1);
    border-color: var(--color-accent-cyan);
}

.award-badge {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--color-accent-cyan);
    color: var(--color-bg);
    border-radius: var(--radius-md);
    font-size: var(--font-size-xs);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    letter-spacing: 0.02em;
}

.project-subtitle {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-md);
    font-style: italic;
}

.project-description {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: var(--spacing-md);
    flex-grow: 1;
}

.project-learning {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    padding: var(--spacing-md);
    background: rgba(168, 85, 247, 0.05);
    border-left: 3px solid var(--color-accent-purple);
    border-radius: var(--radius-sm);
    margin-bottom: var(--spacing-md);
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin-top: auto;
}

.tag {
    padding: var(--spacing-xs) var(--spacing-md);
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-xs);
    color: var(--color-text-secondary);
    font-weight: 500;
}

/* ===== Skills Section ===== */
.skills-grid {
    display: grid;
    gap: var(--spacing-xl);
}

.skill-category {
    padding: var(--spacing-xl);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    backdrop-filter: blur(8px);
}

.skill-category-title {
    font-size: var(--font-size-md);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--color-accent-cyan);
}

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

.skill-tag {
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(6, 182, 212, 0.1);
    border: 1px solid rgba(6, 182, 212, 0.3);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    color: var(--color-text-primary);
    font-weight: 500;
    transition: all var(--transition-fast);
}

.skill-tag:hover {
    background: rgba(6, 182, 212, 0.2);
    border-color: var(--color-accent-cyan);
    transform: translateY(-2px);
}

/* ===== Contact Section ===== */
.contact {
    background: var(--color-bg-secondary);
    text-align: center;
}

.contact-description {
    font-size: var(--font-size-md);
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto var(--spacing-2xl);
}

.contact-links {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
    flex-wrap: wrap;
}

.contact-button {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text-primary);
    text-decoration: none;
    font-weight: 500;
    font-size: var(--font-size-sm);
    transition: all var(--transition-base);
}

.contact-button:hover {
    background: var(--color-surface-hover);
    border-color: var(--color-accent-cyan);
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(6, 182, 212, 0.2);
}

.contact-button svg {
    width: 20px;
    height: 20px;
}

.contact-phone {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

/* ===== Footer ===== */
.footer {
    padding: var(--spacing-xl) 0;
    border-top: 1px solid var(--color-border);
    text-align: center;
}

.footer p {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
}

/* ===== Responsive Design ===== */
@media (max-width: 768px) {
    :root {
        --font-size-3xl: 2.5rem;
        --font-size-2xl: 1.875rem;
        --font-size-xl: 1.5rem;
    }
    
    .nav-container {
        padding: 0 var(--spacing-md);
    }
    
    .nav-links {
        gap: var(--spacing-md);
    }
    
    .container {
        padding: 0 var(--spacing-md);
    }
    
    .hero {
        min-height: auto;
        padding: calc(var(--spacing-3xl) + 60px) 0 var(--spacing-2xl);
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .contact-links {
        flex-direction: column;
        align-items: center;
    }
    
    .contact-button {
        width: 100%;
        max-width: 300px;
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .experience-header {
        flex-direction: column;
    }
    
    .project-header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .project-links {
        width: 100%;
    }
    
    .project-link {
        flex: 1;
        text-align: center;
    }
}

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

@keyframes float {
    0%, 100% {
        transform: translateY(0px);
    }
    50% {
        transform: translateY(-10px);
    }
}

@keyframes shimmer {
    0% {
        background-position: -1000px 0;
    }
    100% {
        background-position: 1000px 0;
    }
}

.timeline-item,
.experience-card,
.project-card,
.skill-category {
    animation: fadeInUp 0.6s ease-out;
}