/* ================================
   RESET & VARIABLES
   ================================ */

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

:root {
    /* Colors - Refined palette inspired by engineering blueprints */
    --color-primary: #1a365d;
    --color-primary-light: #2d4a7a;
    --color-accent: #c17843;
    --color-accent-light: #d89960;
    --color-text: #1a1a1a;
    --color-text-light: #4a5568;
    --color-bg: #ffffff;
    --color-bg-alt: #f7f9fb;
    --color-bg-dark: #0f1419;
    --color-border: #e2e8f0;
    --color-shadow: rgba(0, 0, 0, 0.1);
    
    /* Typography */
    --font-display: 'Crimson Pro', serif;
    --font-body: 'Work Sans', sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
    
    /* Layout */
    --max-width: 1200px;
    --border-radius: 0.5rem;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* ================================
   BASE STYLES
   ================================ */

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    font-size: 16px;
    line-height: 1.7;
    color: var(--color-text);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

/* ================================
   TYPOGRAPHY
   ================================ */

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: 700;
    line-height: 1.2;
    color: var(--color-text);
}

h1 {
    font-size: clamp(2.5rem, 5vw, 4.5rem);
}

h2 {
    font-size: clamp(2rem, 4vw, 3.5rem);
}

h3 {
    font-size: clamp(1.5rem, 3vw, 2rem);
}

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

.lead {
    font-size: 1.25rem;
    font-weight: 400;
    color: var(--color-text-light);
    line-height: 1.8;
}

/* ================================
   NAVIGATION
   ================================ */

.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
    transition: transform var(--transition-base);
}

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

.logo {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-primary);
    text-decoration: none;
    letter-spacing: -0.02em;
    transition: color var(--transition-fast);
}

.logo:hover {
    color: var(--color-accent);
}

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

.nav-link {
    font-weight: 500;
    color: var(--color-text);
    text-decoration: none;
    position: relative;
    padding: var(--spacing-xs) 0;
    transition: color var(--transition-fast);
}

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

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

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

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
}

.mobile-menu-btn span {
    width: 24px;
    height: 2px;
    background: var(--color-primary);
    transition: all var(--transition-base);
}

/* ================================
   HERO SECTION
   ================================ */

.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: calc(60px + var(--spacing-lg)) var(--spacing-md) var(--spacing-lg);
    overflow: hidden;
}

.hero-background {
    position: absolute;
    inset: 0;
    z-index: 0;
    background: linear-gradient(135deg, #f7f9fb 0%, #ffffff 100%);
}

.grid-overlay {
    position: absolute;
    inset: 0;
    background-image: 
        linear-gradient(0deg, transparent 24%, rgba(26, 54, 93, 0.03) 25%, rgba(26, 54, 93, 0.03) 26%, transparent 27%, transparent 74%, rgba(26, 54, 93, 0.03) 75%, rgba(26, 54, 93, 0.03) 76%, transparent 77%, transparent),
        linear-gradient(90deg, transparent 24%, rgba(26, 54, 93, 0.03) 25%, rgba(26, 54, 93, 0.03) 26%, transparent 27%, transparent 74%, rgba(26, 54, 93, 0.03) 75%, rgba(26, 54, 93, 0.03) 76%, transparent 77%, transparent);
    background-size: 60px 60px;
    opacity: 0.5;
}

.geometric-accent {
    position: absolute;
    top: 10%;
    right: 5%;
    width: 600px;
    height: 600px;
    background: linear-gradient(135deg, rgba(193, 120, 67, 0.1) 0%, rgba(45, 74, 122, 0.1) 100%);
    border-radius: 50%;
    filter: blur(80px);
    animation: float 20s ease-in-out infinite;
}

@keyframes float {
    0%, 100% {
        transform: translate(0, 0) scale(1);
    }
    50% {
        transform: translate(30px, -30px) scale(1.1);
    }
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: var(--max-width);
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: var(--spacing-xl);
    align-items: center;
}

.hero-text {
    animation: fadeInUp 1s ease-out;
}

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

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

.title-line {
    display: block;
    font-weight: 600;
}

.title-emphasis {
    color: var(--color-primary);
    font-weight: 700;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-lg);
    max-width: 600px;
    animation: fadeInUp 1s ease-out 0.2s both;
}

.hero-cta {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
    animation: fadeInUp 1s ease-out 0.4s both;
}

.btn {
    display: inline-block;
    padding: 1rem 2rem;
    font-weight: 500;
    text-decoration: none;
    border-radius: var(--border-radius);
    transition: all var(--transition-base);
    border: 2px solid transparent;
    cursor: pointer;
}

.btn-primary {
    background: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
}

.btn-primary:hover {
    background: var(--color-primary-light);
    border-color: var(--color-primary-light);
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(26, 54, 93, 0.2);
}

.btn-secondary {
    background: transparent;
    color: var(--color-primary);
    border-color: var(--color-primary);
}

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

.hero-image {
    position: relative;
    animation: fadeInRight 1s ease-out 0.3s both;
}

@keyframes fadeInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.image-frame {
    position: relative;
    aspect-ratio: 3/4;
    max-width: 400px;
    margin: 0 auto;
}

.profile-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: var(--border-radius);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
}

.frame-accent {
    position: absolute;
    inset: -15px;
    border: 3px solid var(--color-accent);
    border-radius: var(--border-radius);
    z-index: -1;
    transform: rotate(3deg);
}

.scroll-indicator {
    position: absolute;
    bottom: var(--spacing-lg);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 0.875rem;
    color: var(--color-text-light);
    animation: fadeIn 1s ease-out 1s both;
}

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

.scroll-line {
    width: 1px;
    height: 40px;
    background: linear-gradient(to bottom, var(--color-accent), transparent);
    animation: scrollDown 2s ease-in-out infinite;
}

@keyframes scrollDown {
    0%, 100% {
        transform: translateY(0);
        opacity: 0;
    }
    50% {
        transform: translateY(10px);
        opacity: 1;
    }
}

/* ================================
   SECTIONS
   ================================ */

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

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

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.section-label {
    display: inline-block;
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-accent);
    margin-bottom: var(--spacing-sm);
}

.section-title {
    margin-bottom: var(--spacing-sm);
}

/* ================================
   ABOUT SECTION
   ================================ */

.about-content {
    max-width: 900px;
    margin: 0 auto;
}

.about-text {
    text-align: center;
}

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

.expertise-item {
    text-align: center;
    padding: var(--spacing-md);
    background: white;
    border-radius: var(--border-radius);
    border: 1px solid var(--color-border);
    transition: all var(--transition-base);
}

.expertise-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px var(--color-shadow);
    border-color: var(--color-accent);
}

.expertise-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto var(--spacing-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
    border-radius: 50%;
    color: white;
}

.expertise-icon svg {
    width: 30px;
    height: 30px;
}

.expertise-item h3 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-xs);
    color: var(--color-primary);
}

.expertise-item p {
    font-size: 0.9rem;
    color: var(--color-text-light);
    margin: 0;
}

/* ================================
   PROJECTS SECTION
   ================================ */

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-md);
    max-width: 1100px;
    margin: 0 auto;
}

.project-card {
    background: white;
    border-radius: var(--border-radius);
    overflow: hidden;
    border: 1px solid var(--color-border);
    transition: all var(--transition-base);
    opacity: 0;
    transform: translateY(30px);
}

.project-card.visible {
    opacity: 1;
    transform: translateY(0);
}

.project-card.large {
    grid-column: span 1;
}

@media (min-width: 768px) {
    .projects-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .project-card.large {
        grid-column: span 2;
        display: grid;
        grid-template-columns: 1.5fr 1fr;
    }
}

.project-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 15px 40px var(--color-shadow);
    border-color: var(--color-accent);
}

.project-image {
    position: relative;
    aspect-ratio: 16/10;
    overflow: hidden;
    background: var(--color-bg-alt);
}

.project-card.large .project-image {
    aspect-ratio: 16/12;
}

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

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

.project-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(26, 54, 93, 0.9), rgba(193, 120, 67, 0.9));
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity var(--transition-base);
}

.project-card:hover .project-overlay {
    opacity: 1;
}

.project-icon {
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: white;
    border-radius: 50%;
    color: var(--color-primary);
    transform: scale(0.8);
    transition: transform var(--transition-base);
}

.project-card:hover .project-icon {
    transform: scale(1);
}

.project-icon svg {
    width: 30px;
    height: 30px;
}

.project-content {
    padding: var(--spacing-md);
}

.project-card.large .project-content {
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: var(--spacing-lg);
}

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

.project-content p {
    color: var(--color-text-light);
    line-height: 1.7;
    margin-bottom: var(--spacing-sm);
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.tag {
    display: inline-block;
    padding: 0.375rem 0.875rem;
    background: var(--color-bg-alt);
    color: var(--color-primary);
    font-size: 0.813rem;
    font-weight: 600;
    border-radius: 2rem;
    border: 1px solid var(--color-border);
    transition: all var(--transition-fast);
}

.tag:hover {
    background: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
}

/* ================================
   TIMELINE
   ================================ */

.timeline {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
}

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

.timeline-item {
    position: relative;
    padding-left: var(--spacing-lg);
    padding-bottom: var(--spacing-lg);
    opacity: 0;
    transform: translateX(-20px);
    transition: all var(--transition-slow);
}

.timeline-item.visible {
    opacity: 1;
    transform: translateX(0);
}

.timeline-marker {
    position: absolute;
    left: -8px;
    top: 0;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--color-accent);
    border: 3px solid var(--color-bg);
    box-shadow: 0 0 0 3px var(--color-border);
}

.timeline-content {
    background: white;
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    border: 1px solid var(--color-border);
    transition: all var(--transition-base);
}

.timeline-content:hover {
    border-color: var(--color-accent);
    box-shadow: 0 10px 30px var(--color-shadow);
}

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

.timeline-title {
    font-size: 1.5rem;
    color: var(--color-primary);
    margin-bottom: 0.25rem;
}

.timeline-company {
    color: var(--color-text-light);
    font-weight: 500;
}

.timeline-date {
    font-size: 0.875rem;
    color: var(--color-accent);
    font-weight: 600;
    white-space: nowrap;
}

.timeline-description {
    color: var(--color-text-light);
    line-height: 1.7;
    margin-bottom: var(--spacing-sm);
}

.timeline-badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: var(--color-bg-alt);
    color: var(--color-primary);
    font-size: 0.875rem;
    font-weight: 600;
    border-radius: 2rem;
}

/* ================================
   EDUCATION SECTION
   ================================ */

.education-content {
    max-width: 700px;
    margin: 0 auto;
}

.education-card {
    display: flex;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    background: white;
    border-radius: var(--border-radius);
    border: 1px solid var(--color-border);
    transition: all var(--transition-base);
    opacity: 0;
    transform: translateY(20px);
}

.education-card.visible {
    opacity: 1;
    transform: translateY(0);
}

.education-card:hover {
    border-color: var(--color-accent);
    box-shadow: 0 10px 30px var(--color-shadow);
}

.education-icon {
    flex-shrink: 0;
    width: 80px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
    border-radius: var(--border-radius);
    color: white;
}

.education-icon svg {
    width: 40px;
    height: 40px;
}

.education-degree {
    font-size: 1.5rem;
    color: var(--color-primary);
    margin-bottom: var(--spacing-xs);
}

.education-institution {
    color: var(--color-text-light);
    font-weight: 500;
    margin-bottom: 0.25rem;
}

.education-years {
    color: var(--color-accent);
    font-weight: 600;
}

/* ================================
   CONTACT SECTION
   ================================ */

.contact-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

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

.contact-method {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: white;
    border-radius: var(--border-radius);
    border: 1px solid var(--color-border);
    text-decoration: none;
    transition: all var(--transition-base);
}

.contact-method:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px var(--color-shadow);
    border-color: var(--color-accent);
}

.method-icon {
    flex-shrink: 0;
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-bg-alt);
    border-radius: 50%;
    color: var(--color-primary);
}

.method-icon svg {
    width: 24px;
    height: 24px;
}

.contact-method h4 {
    font-size: 1rem;
    color: var(--color-primary);
    margin-bottom: 0.25rem;
    text-align: left;
}

.contact-method p {
    font-size: 0.875rem;
    color: var(--color-text-light);
    margin: 0;
    text-align: left;
}

/* ================================
   FOOTER
   ================================ */

.footer {
    background: var(--color-primary);
    color: white;
    padding: var(--spacing-md);
}

.footer-content {
    max-width: var(--max-width);
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

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

.footer-link {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.footer-link:hover {
    color: var(--color-accent-light);
}

/* ================================
   RESPONSIVE DESIGN
   ================================ */

@media (max-width: 768px) {
    .nav-links {
        position: fixed;
        top: 60px;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: var(--spacing-md);
        border-bottom: 1px solid var(--color-border);
        transform: translateY(-100%);
        transition: transform var(--transition-base);
        opacity: 0;
        pointer-events: none;
    }
    
    .nav-links.active {
        transform: translateY(0);
        opacity: 1;
        pointer-events: all;
    }
    
    .mobile-menu-btn {
        display: flex;
    }
    
    .hero-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
        text-align: center;
    }
    
    .hero-subtitle {
        max-width: 100%;
    }
    
    .hero-cta {
        justify-content: center;
    }
    
    .hero-image {
        order: -1;
    }
    
    .image-frame {
        max-width: 300px;
    }
    
    .expertise-grid {
        grid-template-columns: 1fr;
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .project-card.large {
        grid-column: span 1;
        grid-template-columns: 1fr;
    }
    
    .project-card.large .project-content {
        padding: var(--spacing-md);
    }
    
    .timeline::before {
        left: 8px;
    }
    
    .timeline-item {
        padding-left: var(--spacing-lg);
    }
    
    .timeline-header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .education-card {
        flex-direction: column;
        text-align: center;
    }
    
    .education-icon {
        margin: 0 auto;
    }
    
    .contact-methods {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 480px) {
    :root {
        --spacing-md: 1.5rem;
        --spacing-lg: 3rem;
        --spacing-xl: 4rem;
    }
    
    .hero {
        padding-top: calc(60px + var(--spacing-md));
    }
    
    .btn {
        width: 100%;
        text-align: center;
    }
}