/* ===========================
   DESIGN SYSTEM & VARIABLES
   =========================== */
:root {
    /* Colors - Grok-inspired pure black theme */
    --color-bg-primary: #0a0a0a;
    --color-bg-secondary: #111111;
    --color-bg-card: #161616;
    --color-border-subtle: #1f1f1f;
    --color-border-hover: #2a2a2a;
    --color-text-primary: #ffffff;
    --color-text-secondary: #a1a1a1;
    --color-text-muted: #6b6b6b;
    --color-accent: #ffffff;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;
    
    /* Typography */
    --font-family: 'Sora', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    --font-size-4xl: 2.5rem;
    --font-size-5xl: 3rem;
    --font-size-6xl: 4rem;
    
    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 200ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 300ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* ===========================
   RESET & BASE STYLES
   =========================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    scrollbar-gutter: stable;
}

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

a {
    text-decoration: none;
    color: inherit;
}

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

/* ===========================
   NAVIGATION
   =========================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background-color: rgba(10, 10, 10, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border-subtle);
    transition: background-color var(--transition-base);
}

.navbar.scrolled {
    background-color: rgba(10, 10, 10, 0.95);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1.125rem var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-text-primary);
    transition: opacity var(--transition-fast);
}

.nav-logo:hover {
    opacity: 0.8;
}

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

.nav-link {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    position: relative;
    transition: color var(--transition-base);
    font-weight: 500;
}

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 1px;
    background-color: var(--color-text-primary);
    transition: width var(--transition-base);
}

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

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

.hero-container {
    display: flex;
    align-items: center;
    gap: var(--spacing-3xl);
}

.hero-image-section {
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-lg);
}

.hero-image {
    flex-shrink: 0;
}

.profile-picture {
    width: 250px;
    height: 250px;
    border-radius: 50%;
    object-fit: cover;
    border: 3px solid var(--color-border-hover);
    transition: all var(--transition-base);
}

.profile-picture:hover {
    border-color: var(--color-text-primary);
    transform: scale(1.05);
}

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

.hero-content {
    flex: 1;
    text-align: left;
}

.badge {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-md);
    background-color: var(--color-bg-secondary);
    border: 1px solid var(--color-border-subtle);
    border-radius: 50px;
    font-size: var(--font-size-xs);
    font-weight: 500;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xl);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.hero-title {
    font-size: var(--font-size-5xl);
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: var(--spacing-xl);
    letter-spacing: -0.02em;
}

.hero-bio {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    max-width: 700px;
    margin-bottom: var(--spacing-2xl);
    line-height: 1.7;
    text-align: left;
}

.hero-bio p {
    margin-bottom: var(--spacing-md);
}

.hero-bio p:last-child {
    margin-bottom: 0;
}

.hero-cta {
    display: flex;
    gap: var(--spacing-md);
    align-items: center;
}

/* Responsive for smaller screens */
@media (max-width: 768px) {
    .hero-container {
        flex-direction: column;
        text-align: center;
    }
    
    .hero-image-section {
        margin-top: 0;
    }
    
    .hero-content {
        text-align: center;
    }
    
    .hero-bio {
        text-align: center;
    }
    
    .hero-cta {
        justify-content: center;
    }
    
    .profile-picture {
        width: 200px;
        height: 200px;
    }
    
    .hero-title {
        font-size: var(--font-size-4xl);
    }
}

/* ===========================
   BUTTONS
   =========================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.875rem 2rem;
    font-size: var(--font-size-base);
    font-weight: 500;
    border-radius: 50px;
    cursor: pointer;
    transition: all var(--transition-base);
    border: none;
    font-family: var(--font-family);
}

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

.btn-primary:hover {
    background-color: transparent;
    color: var(--color-text-primary);
    transform: translateY(-2px);
}

.btn-ghost {
    background-color: transparent;
    color: var(--color-text-primary);
    border: 1px solid var(--color-border-hover);
}

.btn-ghost:hover {
    border-color: var(--color-text-primary);
    transform: translateY(-2px);
}

.btn-secondary {
    background-color: var(--color-bg-secondary);
    color: var(--color-text-primary);
    border: 1px solid var(--color-border-hover);
    margin-top: var(--spacing-xl);
}

.btn-secondary:hover {
    background-color: var(--color-bg-card);
    border-color: var(--color-border-hover);
    transform: translateY(-2px);
}

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

.section-title {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    margin-bottom: var(--spacing-2xl);
    text-align: center;
    letter-spacing: -0.02em;
}

/* ===========================
   PROJECTS SECTION
   =========================== */
.projects {
    background-color: var(--color-bg-primary);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
}

.project-card {
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border-subtle);
    border-radius: 12px;
    overflow: hidden;
    transition: all var(--transition-slow);
    display: flex;
    flex-direction: column;
    cursor: pointer;
    text-decoration: none;
    color: inherit;
}

.project-card:hover {
    transform: translateY(-6px);
    border-color: var(--color-text-primary);
    box-shadow: 0 12px 40px rgba(255, 255, 255, 0.05);
}

.project-banner {
    width: 100%;
    height: 180px;
    background: linear-gradient(135deg, var(--color-bg-secondary) 0%, var(--color-bg-card) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.project-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.project-card:hover .project-image {
    transform: scale(1.05);
}

.project-content {
    padding: var(--spacing-md);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    flex-grow: 1;
}

.project-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-text-primary);
    margin: 0;
    line-height: 1.3;
}

.project-description {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    line-height: 1.6;
    margin: 0;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.375rem;
    margin-top: auto;
}

.tag {
    padding: 0.25rem 0.625rem;
    background-color: var(--color-bg-secondary);
    border: 1px solid var(--color-border-subtle);
    border-radius: 4px;
    font-size: 0.7rem;
    color: var(--color-text-secondary);
    font-weight: 500;
}

.project-link {
    color: var(--color-text-primary);
    font-size: var(--font-size-sm);
    font-weight: 500;
    transition: color var(--transition-base);
    display: inline-flex;
    align-items: center;
    margin-top: auto;
}

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

/* ===========================
   ABOUT SECTION
   =========================== */
.about {
    background-color: var(--color-bg-primary);
}

.about-text {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    max-width: 800px;
    margin: 0 auto var(--spacing-xl);
    line-height: 1.8;
    text-align: center;
}

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

.social-link {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 0.75rem 1.5rem;
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border-subtle);
    border-radius: 50px;
    color: var(--color-text-primary);
    font-size: var(--font-size-sm);
    font-weight: 500;
    transition: all var(--transition-base);
}

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

.social-link svg {
    width: 18px;
    height: 18px;
}

/* ===========================   EXPERIENCE SECTION
   =========================== */
.experience {
    background-color: var(--color-bg-primary);
    padding: var(--spacing-3xl) 0;
    overflow-x: hidden;
}

.timeline-horizontal {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    max-width: 1200px;
    margin: 0 auto;
    position: relative;
    padding-top: 3rem;
    gap: 2rem;
}

.timeline-item {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
}

.timeline-link {
    text-decoration: none;
    color: inherit;
}

.timeline-link:hover {
    transform: translateY(-4px);
}

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

.timeline-logo {
    width: 4rem;
    height: 4rem;
    border-radius: 50%;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    margin-bottom: var(--spacing-md);
    padding: 0;
    transition: opacity 0.2s ease;
}

.timeline-link:hover .timeline-logo {
    opacity: 0.8;
}

.timeline-logo img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 50%;
}

/* Text logo for USYD */
.timeline-content {
    text-align: center;
}

.timeline-title {
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-xs);
    line-height: 1.3;
}

.timeline-role {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    margin: 0;
    line-height: 1.4;
}

/* ===========================   CONTACT SECTION
   =========================== */
.contact {
    background-color: var(--color-bg-primary);
}

.contact-subtitle {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto var(--spacing-xl);
    text-align: center;
    line-height: 1.7;
}

.email-link {
    display: block;
    text-align: center;
    font-size: var(--font-size-2xl);
    font-weight: 600;
    color: var(--color-text-primary);
    margin: var(--spacing-xl) 0;
    transition: color var(--transition-base);
}

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

.contact-links {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    margin: var(--spacing-xl) 0;
}

.icon-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border-subtle);
    border-radius: 50%;
    color: var(--color-text-primary);
    transition: all var(--transition-base);
}

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

/* ===========================
   FOOTER
   =========================== */
.footer {
    background-color: var(--color-bg-primary);
    border-top: 1px solid var(--color-border-subtle);
    padding: var(--spacing-2xl) 0;
}

.footer .container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
}

.footer-text {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    text-align: center;
}

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

.footer-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    color: var(--color-text-muted);
    transition: color var(--transition-base);
}

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

/* ===========================
   RESPONSIVE DESIGN
   =========================== */
@media (max-width: 1024px) {
    .hero-title {
        font-size: var(--font-size-5xl);
    }
    
    .section-title {
        font-size: var(--font-size-3xl);
    }
    
    .projects-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .nav-container {
        flex-direction: column;
        gap: var(--spacing-md);
        padding: var(--spacing-md);
    }
    
    .nav-links {
        gap: var(--spacing-lg);
    }
    
    .profile-picture {
        width: 150px;
        height: 150px;
    }
    
    .hero {
        padding: var(--spacing-2xl) 0;
        min-height: auto;
        margin-top: 80px;
    }
    
    .hero-title {
        font-size: var(--font-size-4xl);
    }
    
    .hero-bio {
        font-size: var(--font-size-base);
    }
    
    .hero-bio p {
        margin-bottom: var(--spacing-sm);
    }
    
    .hero-cta {
        flex-direction: column;
        width: 100%;
    }
    
    .hero-cta .btn {
        width: 100%;
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .project-banner {
        height: 160px;
    }
    
    .section-title {
        font-size: var(--font-size-2xl);
    }
    
    .about-text {
        font-size: var(--font-size-base);
    }
    
    .about-links {
        flex-direction: column;
        width: 100%;
        max-width: 300px;
        margin-left: auto;
        margin-right: auto;
    }
    
    .social-link {
        width: 100%;
        justify-content: center;
    }
    
    .email-link {
        font-size: var(--font-size-xl);
        word-break: break-all;
    }
    
    .contact-links {
        gap: var(--spacing-sm);
    }
    
    .timeline-horizontal {
        flex-direction: column;
        align-items: stretch;
        padding-top: 0;
        gap: var(--spacing-xl);
    }
    
    .timeline-item {
        flex-direction: row;
        align-items: center;
        gap: var(--spacing-lg);
    }
    
    .timeline-logo {
        width: 3.2rem;
        height: 3.2rem;
        flex-shrink: 0;
        margin-bottom: 0;
    }
    
    .timeline-content {
        text-align: left;
        flex: 1;
    }
    
    section {
        padding: var(--spacing-2xl) 0;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-md);
    }
    
    .profile-picture {
        width: 120px;
        height: 120px;
    }
    
    .hero-title {
        font-size: var(--font-size-3xl);
    }
    
    .nav-links {
        gap: var(--spacing-md);
    }
    
    .nav-link {
        font-size: var(--font-size-xs);
    }
    
    .email-link {
        font-size: var(--font-size-lg);
    }
    
    .timeline-logo {
        width: 2.8rem;
        height: 2.8rem;
    }
    
    .timeline-title {
        font-size: var(--font-size-sm);
    }
    
    .timeline-role {
        font-size: var(--font-size-xs);
    }
}

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

.hero .container > * {
    animation: fadeInUp 0.8s ease-out backwards;
}

.hero .hero-image {
    animation-delay: 0.1s;
}

.hero .hero-title {
    animation-delay: 0.2s;
}

.hero .hero-bio {
    animation-delay: 0.3s;
}

.hero .hero-cta {
    animation-delay: 0.4s;
}