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

:root {
    /* Colors */
    --color-primary: #2563eb;
    --color-primary-dark: #1e40af;
    --color-primary-light: #3b82f6;
    --color-secondary: #64748b;
    --color-accent: #06b6d4;
    
    --color-bg: #ffffff;
    --color-bg-alt: #f8fafc;
    --color-surface: #ffffff;
    --color-border: #e2e8f0;
    
    --color-text: #1e293b;
    --color-text-light: #64748b;
    --color-text-muted: #94a3b8;
    
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-error: #ef4444;
    
    /* 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: 'Inter', -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: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;
    
    /* Border radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;
    
    /* Container */
    --container-max: 1200px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    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%;
    height: auto;
    display: block;
}

a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition-base);
}

ul {
    list-style: none;
}

/* ==========================================
   UTILITIES
   ========================================== */

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

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
}

.section-tag {
    display: inline-block;
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-primary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--spacing-sm);
}

.section-title {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: var(--spacing-md);
    line-height: 1.2;
}

.section-description {
    font-size: var(--font-size-lg);
    color: var(--color-text-light);
    max-width: 600px;
    margin: 0 auto;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 0.75rem 1.5rem;
    font-size: var(--font-size-base);
    font-weight: 600;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
    text-align: center;
}

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

.btn-primary:hover {
    background-color: var(--color-primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background-color: transparent;
    color: var(--color-text);
    border: 2px solid var(--color-border);
}

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

.btn-full {
    width: 100%;
    justify-content: center;
}

.btn-icon {
    width: 1.25rem;
    height: 1.25rem;
}

.highlight {
    color: var(--color-primary);
    font-weight: 600;
}

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

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

.nav-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) 0;
}

.logo {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-primary);
}

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

.nav-links a {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text-light);
    transition: color var(--transition-base);
}

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

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 0.25rem;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.mobile-menu-toggle span {
    display: block;
    width: 1.5rem;
    height: 2px;
    background-color: var(--color-text);
    transition: all var(--transition-base);
}

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

.hero {
    padding: calc(80px + var(--spacing-3xl)) 0 var(--spacing-3xl);
    min-height: 100vh;
    display: flex;
    align-items: center;
}

.hero-content {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
}

.hero-title {
    font-size: var(--font-size-5xl);
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
}

.hero-subtitle {
    font-size: var(--font-size-lg);
    color: var(--color-text-light);
    margin-bottom: var(--spacing-xl);
    line-height: 1.7;
}

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

.hero-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--color-border);
}

.stat {
    display: flex;
    flex-direction: column;
}

.stat-number {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--spacing-xs);
}

.stat-label {
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
}

.profile-card {
    position: relative;
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-xl);
}

.profile-img {
    width: 100%;
    aspect-ratio: 3/4;
    object-fit: cover;
}

.status-badge {
    position: absolute;
    bottom: var(--spacing-md);
    left: var(--spacing-md);
    right: var(--spacing-md);
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: var(--font-size-sm);
    font-weight: 600;
}

.status-dot {
    width: 0.5rem;
    height: 0.5rem;
    background-color: var(--color-success);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

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

.about {
    padding: var(--spacing-3xl) 0;
    background-color: var(--color-bg-alt);
}

.about-content {
    display: grid;
    gap: var(--spacing-3xl);
}

.about-text {
    max-width: 800px;
}

.lead {
    font-size: var(--font-size-lg);
    font-weight: 500;
    color: var(--color-text);
    margin-bottom: var(--spacing-lg);
    line-height: 1.7;
}

.about-text p {
    margin-bottom: var(--spacing-md);
    color: var(--color-text-light);
}

.experience-highlights {
    display: grid;
    gap: var(--spacing-md);
    margin-top: var(--spacing-xl);
}

.highlight-item {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background-color: var(--color-surface);
    border-radius: var(--radius-md);
    border-left: 3px solid var(--color-primary);
}

.highlight-item .icon {
    width: 1.5rem;
    height: 1.5rem;
    color: var(--color-primary);
    flex-shrink: 0;
}

.about-companies h3 {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-lg);
    color: var(--color-text);
}

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

.company-card {
    display: flex;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background-color: var(--color-surface);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    transition: all var(--transition-base);
}

.company-card:hover {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-md);
}

.company-logo {
    width: 3rem;
    height: 3rem;
    background: linear-gradient(135deg, var(--color-primary-light), var(--color-primary));
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    font-weight: 700;
    font-size: var(--font-size-sm);
    flex-shrink: 0;
}

.company-info h4 {
    font-size: var(--font-size-base);
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.company-info p {
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
    margin-bottom: 0.25rem;
}

.company-period {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
}

/* ==========================================
   SERVICES SECTION
   ========================================== */

.services {
    padding: var(--spacing-3xl) 0;
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-lg);
}

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

.service-card:hover {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.service-icon {
    width: 3rem;
    height: 3rem;
    background: linear-gradient(135deg, var(--color-primary-light), var(--color-primary));
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
}

.service-icon svg {
    width: 1.5rem;
    height: 1.5rem;
}

.service-card h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.service-card > p {
    color: var(--color-text-light);
    margin-bottom: var(--spacing-md);
}

.service-features {
    display: grid;
    gap: var(--spacing-xs);
}

.service-features li {
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
    padding-left: var(--spacing-md);
    position: relative;
}

.service-features li::before {
    content: "→";
    position: absolute;
    left: 0;
    color: var(--color-primary);
    font-weight: 600;
}

/* ==========================================
   TECH STACK SECTION
   ========================================== */

.tech-stack {
    padding: var(--spacing-3xl) 0;
    background-color: var(--color-bg-alt);
}

.stack-categories {
    display: grid;
    gap: var(--spacing-xl);
}

.stack-category h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: var(--spacing-sm);
}

.tech-item {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
}

.tech-item:hover {
    border-color: var(--color-primary);
    transform: translateX(4px);
}

.tech-item.featured {
    border-color: var(--color-primary);
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.05), rgba(59, 130, 246, 0.05));
}

.tech-name {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-text);
}

.tech-level {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
}

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

.projects {
    padding: var(--spacing-3xl) 0;
}

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

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

.project-card:hover {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.project-card.featured {
    border-color: var(--color-primary);
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.03), rgba(59, 130, 246, 0.03));
}

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

.project-tag {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background-color: var(--color-primary);
    color: white;
    font-size: var(--font-size-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-radius: var(--radius-sm);
}

.project-company {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    font-weight: 500;
}

.project-card h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text);
}

.project-card > p {
    color: var(--color-text-light);
    margin-bottom: var(--spacing-md);
}

.project-highlights {
    display: grid;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-md);
}

.project-highlights li {
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
    padding-left: var(--spacing-md);
    position: relative;
}

.project-highlights li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--color-success);
    font-weight: 600;
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--color-border);
}

.project-tech span {
    padding: 0.25rem 0.75rem;
    background-color: var(--color-bg-alt);
    color: var(--color-text-light);
    font-size: var(--font-size-xs);
    font-weight: 500;
    border-radius: var(--radius-sm);
}

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

.contact {
    padding: var(--spacing-3xl) 0;
    background-color: var(--color-bg-alt);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
}

.contact-info .section-header {
    text-align: left;
    margin-bottom: var(--spacing-xl);
}

.contact-methods {
    display: grid;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.contact-method {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
}

.contact-method:hover {
    border-color: var(--color-primary);
    transform: translateX(4px);
}

.contact-icon {
    width: 3rem;
    height: 3rem;
    background: linear-gradient(135deg, var(--color-primary-light), var(--color-primary));
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    flex-shrink: 0;
}

.contact-icon svg {
    width: 1.5rem;
    height: 1.5rem;
}

.contact-method h4 {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-text-muted);
    margin-bottom: 0.25rem;
}

.contact-method p {
    font-size: var(--font-size-base);
    font-weight: 500;
    color: var(--color-text);
}

.availability-card {
    padding: var(--spacing-md);
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.1), rgba(5, 150, 105, 0.05));
    border: 1px solid var(--color-success);
    border-radius: var(--radius-md);
}

.availability-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-xs);
}

.availability-card p {
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
}

.contact-form-wrapper {
    background-color: var(--color-surface);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
}

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-group label {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--spacing-xs);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    font-family: inherit;
    font-size: var(--font-size-base);
    color: var(--color-text);
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-group textarea {
    resize: vertical;
}

.form-note {
    margin-top: var(--spacing-md);
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
    text-align: center;
}

.form-note a {
    color: var(--color-primary);
    text-decoration: underline;
}

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

.footer {
    padding: var(--spacing-3xl) 0 var(--spacing-lg);
    background-color: var(--color-text);
    color: var(--color-bg);
}

.footer-content {
    display: grid;
    grid-template-columns: 1.5fr 2fr;
    gap: var(--spacing-3xl);
    margin-bottom: var(--spacing-xl);
}

.footer-info h3 {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-xs);
}

.footer-info p {
    color: var(--color-text-muted);
    margin-bottom: 0.25rem;
}

.footer-tagline {
    margin-top: var(--spacing-sm);
}

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

.footer-column h4 {
    font-size: var(--font-size-base);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

.footer-column ul {
    display: grid;
    gap: var(--spacing-sm);
}

.footer-column a {
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
    transition: color var(--transition-base);
}

.footer-column a:hover {
    color: var(--color-bg);
}

.footer-bottom {
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
}

.footer-bottom p {
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
    margin-bottom: 0.25rem;
}

.footer-tech {
    color: var(--color-text-muted);
    opacity: 0.6;
}

/* ==========================================
   CLIENTS SECTION
   ========================================== */

.clients-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.client-card {
    padding: var(--spacing-xl);
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
    text-align: center;
}

.client-card:hover {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.client-logo {
    width: 4rem;
    height: 4rem;
    background: linear-gradient(135deg, var(--color-primary-light), var(--color-primary));
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-lg);
    font-weight: 700;
    font-size: var(--font-size-xl);
    margin: 0 auto var(--spacing-md);
}

.client-card h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: var(--color-text);
}

.client-industry {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-sm);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.client-desc {
    color: var(--color-text-light);
    margin-bottom: var(--spacing-md);
}

.client-tech {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    justify-content: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--color-border);
}

.client-tech span {
    padding: 0.25rem 0.75rem;
    background-color: var(--color-bg-alt);
    color: var(--color-text-light);
    font-size: var(--font-size-xs);
    font-weight: 500;
    border-radius: var(--radius-sm);
}

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

@media (max-width: 1024px) {
    :root {
        --font-size-5xl: 2.5rem;
        --font-size-4xl: 2rem;
    }
    
    .hero-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }
    
    .hero-image {
        max-width: 400px;
        margin: 0 auto;
    }
    
    .contact-content {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    :root {
        --font-size-5xl: 2rem;
        --font-size-4xl: 1.75rem;
        --spacing-3xl: 4rem;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .nav-links {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background-color: var(--color-bg);
        flex-direction: column;
        padding: var(--spacing-lg);
        border-bottom: 1px solid var(--color-border);
        box-shadow: var(--shadow-lg);
        transform: translateY(-100%);
        opacity: 0;
        transition: all var(--transition-base);
        pointer-events: none;
    }
    
    .nav-links.active {
        transform: translateY(0);
        opacity: 1;
        pointer-events: all;
    }
    
    .hero {
        padding-top: calc(80px + var(--spacing-xl));
        min-height: auto;
    }
    
    .hero-stats {
        grid-template-columns: 1fr;
    }
    
    .hero-cta {
        flex-direction: column;
    }
    
    .services-grid,
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .tech-grid {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    }
    
    .companies-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
    
    .footer-links {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .section-title {
        font-size: var(--font-size-3xl);
    }
    
    .hero-title {
        font-size: var(--font-size-4xl);
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
}