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

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

:root {
    --color-primary: #1a1a1a;
    --color-secondary: #4a4a4a;
    --color-accent: #2563eb;
    --color-bg: #ffffff;
    --color-bg-alt: #f8f9fa;
    --color-border: #e5e7eb;
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --max-width: 1200px;
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
}

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

/* Offset anchor scroll targets so they clear the sticky header */
[id] {
    scroll-margin-top: 80px;
}

body {
    font-family: var(--font-primary);
    color: var(--color-primary);
    line-height: 1.6;
    font-size: 16px;
    background: var(--color-bg);
}

/* ===========================
   Typography
   =========================== */

h1, h2, h3, h4, h5, h6 {
    line-height: 1.2;
    font-weight: 600;
}

h1 {
    font-size: 3.5rem;
    margin-bottom: var(--spacing-md);
}

h2 {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
}

h3 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
}

p {
    margin-bottom: var(--spacing-sm);
}

a {
    color: var(--color-accent);
    text-decoration: none;
    transition: opacity 0.2s ease;
}

a:hover {
    opacity: 0.8;
}

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

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

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

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

.header {
    position: sticky;
    top: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
    z-index: 1000;
    padding: var(--spacing-sm) 0;
}

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

.logo {
    font-size: 1.125rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    color: var(--color-primary);
}

.nav-links {
    display: flex;
    list-style: none;
    gap: var(--spacing-md);
}

.nav-links a {
    color: var(--color-secondary);
    font-weight: 500;
    font-size: 0.95rem;
}

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

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

.hero {
    padding: var(--spacing-xl) 0;
    background: var(--color-bg-alt);
}

.hero-wrapper {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: var(--spacing-lg);
    align-items: center;
}

.hero-image {
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-image img {
    width: 100%;
    max-width: 400px;
    height: auto;
    border-radius: 12px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
}

.hero-content {
    max-width: 100%;
}

.hero-name {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
    color: var(--color-primary);
}

.hero-title {
    font-size: 2.5rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--color-secondary);
    white-space: nowrap;
}

.title-rotating {
    display: inline-block;
    color: var(--color-accent);
    vertical-align: baseline;
    position: relative;
    transition: color 0.3s ease;
}

.title-rotating::after {
    content: '|';
    color: var(--color-accent);
    animation: blink 1.5s step-end infinite;
    margin-left: 2px;
}

.title-rotating.hide-cursor::after {
    display: none;
}

.title-rotating.final-state {
    color: var(--color-primary);
}

@keyframes blink {
    0%, 60% {
        opacity: 1;
    }
    61%, 100% {
        opacity: 0;
    }
}

.title-static {
    display: inline-block;
    color: var(--color-primary);
    vertical-align: baseline;
    margin-left: 0.2rem;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--color-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.5;
}

.hero-description {
    font-size: 1rem;
    color: var(--color-secondary);
    margin-bottom: var(--spacing-sm);
    line-height: 1.7;
}

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

.cta-button {
    display: inline-block;
    padding: 1rem 2rem;
    background: var(--color-primary);
    color: var(--color-bg);
    font-weight: 600;
    border-radius: 6px;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    opacity: 1;
}

.cta-button.secondary {
    background: transparent;
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
}

.cta-button.secondary:hover {
    background: var(--color-primary);
    color: var(--color-bg);
}

/* ===========================
   Experience Section
   =========================== */

.about-intro-section {
    background: var(--color-bg-alt);
    padding-top: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
}

.about-intro-section .section-title {
    margin-bottom: var(--spacing-md);
}

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

.section-title {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-lg);
    text-align: center;
}

.section-subtitle {
    font-size: 1rem;
    line-height: 1.6;
}

/* About Section - Timeline */
.about-intro {
    max-width: 700px;
    margin: 0 auto 0;
    text-align: center;
}

.about-intro p {
    color: var(--color-secondary);
    font-size: 1.05rem;
    line-height: 1.7;
}

.experience-timeline {
    max-width: 700px;
    margin: 0 auto 3rem;
}

.timeline-item {
    padding: 1.5rem 0;
    border-bottom: 1px solid var(--color-border);
}

.timeline-item:last-child {
    border-bottom: none;
}

.timeline-item .timeline-role {
    display: flex;
    align-items: baseline;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.timeline-item h3 {
    margin: 0;
    font-size: 1.1rem;
    color: var(--color-primary);
}

.timeline-item .company {
    color: var(--color-secondary);
    font-size: 0.95rem;
    margin: 0;
}

.timeline-item .timeline-dates {
    color: var(--color-secondary);
    font-size: 0.85rem;
    margin: 0.25rem 0 0.5rem;
    opacity: 0.7;
}

.timeline-item .timeline-summary {
    color: var(--color-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
    margin: 0;
}

.about-cta {
    text-align: center;
    margin-bottom: 3rem;
}

.about-cta p {
    color: var(--color-secondary);
    font-size: 0.95rem;
    margin-bottom: 1rem;
}

.about-cta-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* Skills & Tools */
.skills-tools {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.skills-column h3 {
    margin-bottom: var(--spacing-sm);
    color: var(--color-primary);
}

.skill-list {
    list-style: none;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.5rem 1.5rem;
}

.skill-list li {
    padding: 0;
    transition: none;
    cursor: pointer;
}

.skill-list li:hover {
    transform: none;
    color: inherit;
}

/* Skill/Tool Interactive Links */
.skill-link {
    color: var(--color-secondary);
    text-decoration: none;
    display: block;
    padding: 0.5rem 0;
    transition: color 0.2s ease, transform 0.1s ease;
    position: relative;
}

.skill-link:hover {
    color: var(--color-primary);
    transform: translateX(4px);
    opacity: 1;
}

/* ===========================
   Projects Section
   =========================== */

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

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

.project-card {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    overflow: hidden;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    cursor: pointer;
    display: flex;
    flex-direction: column;
}

.project-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
}

.project-card-image {
    width: 100%;
    height: 200px;
    overflow: hidden;
    background: var(--color-bg-alt);
}

.project-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

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

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

.project-card h3 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-xs);
    color: var(--color-primary);
}

.project-tagline {
    font-size: 1rem;
    color: var(--color-secondary);
    margin-bottom: var(--spacing-sm);
    font-style: italic;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: var(--spacing-sm);
}

.project-tag {
    background: var(--color-bg-alt);
    padding: 0.25rem 0.75rem;
    border-radius: 4px;
    font-size: 0.85rem;
    color: var(--color-secondary);
    border: 1px solid var(--color-border);
}

.project-summary {
    color: var(--color-secondary);
    line-height: 1.6;
    margin-bottom: var(--spacing-sm);
}

.project-link {
    display: inline-block;
    margin-top: auto;
    padding-top: var(--spacing-sm);
    color: var(--color-accent);
    font-weight: 600;
    font-size: 0.95rem;
}

.project-link::after {
    content: " →";
}

/* ===========================
   Testimonials Section
   =========================== */

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

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

.testimonial {
    padding: var(--spacing-md);
    background: var(--color-bg-alt);
    border-radius: 8px;
    border-left: 4px solid var(--color-accent);
    position: relative;
    display: flex;
    flex-direction: column;
}

.testimonial .quote {
    font-size: 1rem;
    line-height: 1.7;
    color: var(--color-secondary);
    margin-bottom: var(--spacing-md);
    font-style: italic;
    flex-grow: 1;
}

.testimonial-footer {
    display: flex;
    gap: 1rem;
    align-items: center;
    margin-top: auto;
}

.testimonial-photo {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    object-fit: cover;
    border: 3px solid var(--color-bg);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    flex-shrink: 0;
}

.testimonial-author-info {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.testimonial .author {
    font-size: 0.95rem;
    color: var(--color-primary);
    margin: 0;
}

.testimonial-footer a {
    font-size: 0.85rem;
    color: var(--color-accent);
    text-decoration: none;
}

.testimonial-footer a:hover {
    text-decoration: underline;
}

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

.contact {
    background: var(--color-bg-alt);
    text-align: center;
}

.contact-text {
    font-size: 1.125rem;
    color: var(--color-secondary);
    margin-bottom: var(--spacing-md);
}

.contact-links {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
}

.contact-button {
    padding: 1rem 2rem;
    background: var(--color-primary);
    color: var(--color-bg);
    font-weight: 600;
    border-radius: 6px;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.contact-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    opacity: 1;
}

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

.footer {
    background: var(--color-primary);
    color: var(--color-bg);
    text-align: center;
    padding: var(--spacing-md) 0;
}

.footer p {
    margin: 0;
    font-size: 0.9rem;
}

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

@media (max-width: 768px) {
    h1 {
        font-size: 2.5rem;
    }

    h2 {
        font-size: 2rem;
    }

    .hero-wrapper {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    .hero-image {
        order: -1;
    }

    .hero-image img {
        max-width: 300px;
    }

    .hero-name {
        font-size: 2.5rem;
    }

    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1.125rem;
    }

    .hero-actions {
        flex-direction: column;
    }

    .nav-links {
        gap: var(--spacing-sm);
        font-size: 0.9rem;
    }

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

    .skills-tools {
        grid-template-columns: 1fr;
    }

    .contact-links {
        flex-direction: column;
        align-items: center;
    }

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

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

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-sm);
    }

    .nav-links {
        display: none; /* Simple mobile nav - can enhance later */
    }

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