/* ==========================================================================
   CSS Custom Properties
   ========================================================================== */

:root {
    /* Colors */
    --color-bg: #fafafa;
    --color-bg-alt: #f0f0f0;
    --color-text: #1a1a1a;
    --color-text-muted: #555;
    --color-accent: #2a7f8c;
    --color-accent-hover: #236d78;
    --color-border: #e0e0e0;

    /* Typography */
    --font-body: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: ui-monospace, 'SF Mono', 'Cascadia Code', 'Consolas', monospace;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;

    /* Layout */
    --max-width: 1100px;
    --border-radius: 4px;

    /* Transitions */
    --transition-fast: 150ms ease;
}

/* ==========================================================================
   Reset & Base
   ========================================================================== */

*,
*::before,
*::after {
    box-sizing: border-box;
}

* {
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

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

ul {
    list-style: none;
}

/* ==========================================================================
   Layout
   ========================================================================== */

.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-sm);
}

.section {
    padding: var(--spacing-xl) 0;
}

.section-alt {
    background-color: var(--color-bg-alt);
}

.section-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
    letter-spacing: 0.05em;
    text-transform: uppercase;
    color: var(--color-text-muted);
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */

.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    padding: var(--spacing-sm) 0;
    background-color: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    font-family: var(--font-mono);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-accent);
}

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

.nav-links a {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    transition: color var(--transition-fast);
}

.nav-links a:hover {
    color: var(--color-accent);
}

/* ==========================================================================
   Hero
   ========================================================================== */

.hero {
    padding: var(--spacing-xl) 0;
    min-height: 60vh;
    display: flex;
    align-items: center;
}

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

.hero-name {
    font-size: clamp(2.5rem, 8vw, 4rem);
    font-weight: 700;
    letter-spacing: -0.03em;
    line-height: 1.1;
}

.hero-profile {
    width: 110px;
    height: 110px;
    border-radius: 50%;
    object-fit: cover;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    flex-shrink: 0;
}

.hero-title {
    font-family: var(--font-mono);
    font-size: 1.1rem;
    color: var(--color-accent);
    margin-top: var(--spacing-xs);
}

.hero-location {
    font-size: 0.95rem;
    color: var(--color-text-muted);
    margin-top: var(--spacing-xs);
}

.hero-tagline {
    font-size: 1.15rem;
    color: var(--color-text);
    margin-top: var(--spacing-lg);
    max-width: 400px;
    font-weight: 400;
}

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

.hero-link {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.9rem;
    color: var(--color-text-muted);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    transition: all var(--transition-fast);
}

.hero-link:hover {
    color: var(--color-accent);
    border-color: var(--color-accent);
}

.link-icon {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    font-weight: 600;
}

/* ==========================================================================
   Timeline (Experience)
   ========================================================================== */

.timeline {
    position: relative;
    padding-left: var(--spacing-md);
}

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.5rem;
    bottom: 0.5rem;
    width: 2px;
    background-color: var(--color-border);
}

.timeline-item {
    position: relative;
    padding-bottom: var(--spacing-lg);
}

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

.timeline-marker {
    position: absolute;
    left: calc(-1 * var(--spacing-md) - 4px);
    top: 0.5rem;
    width: 10px;
    height: 10px;
    background-color: var(--color-accent);
    border-radius: 50%;
}

.timeline-header {
    margin-bottom: var(--spacing-xs);
}

.timeline-role {
    font-size: 1.1rem;
    font-weight: 600;
}

.timeline-company {
    font-size: 0.95rem;
    color: var(--color-accent);
}

.timeline-location {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    margin-top: 0.15rem;
}

.timeline-date {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--color-text-muted);
    margin-top: 0.25rem;
}

.timeline-description {
    color: var(--color-text-muted);
    margin-top: var(--spacing-xs);
}

.timeline-list {
    margin-top: var(--spacing-xs);
    color: var(--color-text-muted);
}

.timeline-list li {
    position: relative;
    padding-left: 1.25rem;
    margin-bottom: 0.4rem;
}

.timeline-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.55rem;
    width: 5px;
    height: 5px;
    background-color: var(--color-border);
    border-radius: 50%;
}

/* ==========================================================================
   Education
   ========================================================================== */

.education-item {
    max-width: 600px;
}

.education-degree {
    font-size: 1.1rem;
    font-weight: 600;
    line-height: 1.4;
}

.education-school {
    color: var(--color-accent);
    margin-top: var(--spacing-xs);
}

.education-date {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--color-text-muted);
    margin-top: 0.25rem;
}

.education-gpa {
    font-family: var(--font-mono);
    font-size: 0.9rem;
    color: var(--color-text-muted);
    margin-top: var(--spacing-xs);
}

/* ==========================================================================
   Projects Grid
   ========================================================================== */

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--spacing-md);
}

.project-card {
    display: block;
    background-color: var(--color-bg-alt);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    overflow: hidden;
    transition: all var(--transition-fast);
}

.project-card:hover {
    border-color: var(--color-accent);
    transform: translateY(-2px);
}

.project-image-placeholder {
    aspect-ratio: 16 / 10;
    background-color: var(--color-border);
    background-image: linear-gradient(135deg, var(--color-border) 0%, #d0d0d0 100%);
}

.project-image {
    aspect-ratio: 16 / 10;
    width: 100%;
    object-fit: cover;
    background-color: var(--color-border);
}

.project-info {
    padding: var(--spacing-sm) var(--spacing-sm) calc(var(--spacing-sm) + 0.25rem);
}

.project-title {
    font-size: 1rem;
    font-weight: 600;
}

.project-description {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    margin-top: 0.5rem;
    line-height: 1.55;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    margin-top: 0.75rem;
}

.tag {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    padding: 0.25rem 0.5rem;
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 3px;
    color: var(--color-text-muted);
    white-space: nowrap;
}

.project-year {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    margin-top: 0.15rem;
}

.project-subtitle {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--color-text-muted);
    margin-top: 0.25rem;
}

/* ==========================================================================
   Contact
   ========================================================================== */

#contact {
    text-align: center;
}

.contact-text {
    color: var(--color-text-muted);
    font-size: 1.1rem;
    margin-bottom: var(--spacing-md);
}

.contact-email {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 1.25rem;
    color: var(--color-accent);
    padding: var(--spacing-xs) 0;
    border-bottom: 2px solid transparent;
    transition: border-color var(--transition-fast);
}

.contact-email:hover {
    border-color: var(--color-accent);
}

/* ==========================================================================
   Footer
   ========================================================================== */

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

.site-footer p {
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

/* ==========================================================================
   Responsive
   ========================================================================== */

@media (max-width: 768px) {
    .nav-links {
        gap: var(--spacing-sm);
    }

    .nav-links a {
        font-size: 0.85rem;
    }

    .hero {
        min-height: auto;
        padding: var(--spacing-lg) 0;
    }

    .section {
        padding: var(--spacing-lg) 0;
    }

    .section-title {
        font-size: 1.1rem;
        margin-bottom: var(--spacing-md);
    }

    .timeline {
        padding-left: var(--spacing-sm);
    }

    .timeline-marker {
        left: calc(-1 * var(--spacing-sm) - 4px);
    }

    .timeline-item {
        padding-bottom: var(--spacing-md);
    }

    .projects-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .nav-links {
        display: none;
    }

    .hero-header {
        flex-direction: column-reverse;
        align-items: flex-start;
        gap: var(--spacing-sm);
    }

    .hero-profile {
        width: 80px;
        height: 80px;
    }

    .hero-links {
        flex-direction: column;
        align-items: flex-start;
    }
}