/* ============================================
   RESET & BASE STYLES
   ============================================ */

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

:root {
    /* Color Palette - Minimalista */
    --color-primary: #0A0A0A;
    --color-secondary: #1A1A1A;
    --color-accent: #2E2E2E;
    --color-text: #E5E5E5;
    --color-text-muted: #A0A0A0;
    --color-border: #2A2A2A;
    --color-bg: #FAFAFA;
    --color-white: #FFFFFF;
    
    /* Typography */
    --font-primary: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-mono: "SF Mono", Monaco, "Cascadia Code", "Roboto Mono", Consolas, "Courier New", monospace;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-primary);
    background-color: var(--color-bg);
    color: var(--color-primary);
    line-height: 1.7;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

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

h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    letter-spacing: -0.02em;
}

h1 {
    font-size: clamp(2.5rem, 8vw, 5rem);
}

h2 {
    font-size: clamp(2rem, 5vw, 3.5rem);
}

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

p {
    margin-bottom: 1.5rem;
}

.lead {
    font-size: 1.25rem;
    font-weight: 500;
    color: var(--color-secondary);
}

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

.nav {
    position: fixed;
    top: 0;
    width: 100%;
    background-color: rgba(250, 250, 250, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    border-bottom: 1px solid var(--color-border);
}

.nav .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--spacing-sm);
    padding-bottom: var(--spacing-sm);
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-primary);
    text-decoration: none;
    letter-spacing: -0.05em;
}

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

.nav-links a {
    color: var(--color-text-muted);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    transition: color var(--transition-fast);
}

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

.lang-toggle {
    padding: 0.4rem 0.8rem;
    border: 1px solid var(--color-border);
    border-radius: 4px;
    transition: all var(--transition-fast);
}

.lang-toggle:hover {
    background-color: var(--color-primary);
    color: var(--color-white) !important;
    border-color: var(--color-primary);
}

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

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 80px;
}

.hero-content {
    max-width: 900px;
}

.hero-subtitle {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--spacing-sm);
}

.hero-title {
    margin-bottom: var(--spacing-md);
    font-weight: 700;
}

.hero-description {
    font-size: 1.25rem;
    color: var(--color-secondary);
    max-width: 700px;
    margin-bottom: var(--spacing-lg);
    line-height: 1.6;
}

.hero-cta {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

/* ============================================
   BUTTONS
   ============================================ */

.btn {
    display: inline-block;
    padding: 1rem 2rem;
    text-decoration: none;
    font-weight: 500;
    border-radius: 4px;
    transition: all var(--transition-base);
    font-size: 1rem;
    border: 2px solid transparent;
}

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

.btn-primary:hover {
    background-color: var(--color-secondary);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
}

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

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

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

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

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

.section-subtitle {
    text-align: center;
    color: var(--color-text-muted);
    font-size: 1.125rem;
    max-width: 600px;
    margin: 0 auto var(--spacing-lg);
}

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

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

.about-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.about-text {
    max-width: 700px;
}

.about-skills h3 {
    margin-bottom: var(--spacing-md);
    font-size: 1.5rem;
}

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

.skill-item {
    padding: var(--spacing-md);
    background-color: var(--color-bg);
    border-radius: 8px;
    border: 1px solid var(--color-border);
}

.skill-item h4 {
    margin-bottom: var(--spacing-sm);
    font-size: 1.125rem;
    color: var(--color-primary);
}

.skill-item ul {
    list-style: none;
}

.skill-item li {
    padding: 0.4rem 0;
    color: var(--color-secondary);
    font-size: 0.95rem;
}

.skill-item li:before {
    content: "→ ";
    color: var(--color-text-muted);
    margin-right: 0.5rem;
}

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

.projects-grid {
    display: grid;
    gap: var(--spacing-xl);
    margin-top: var(--spacing-lg);
}

.project-card {
    background-color: var(--color-white);
    padding: var(--spacing-lg);
    border-radius: 12px;
    border: 1px solid var(--color-border);
    transition: all var(--transition-base);
}

.project-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.08);
    border-color: var(--color-primary);
}

.project-number {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-sm);
}

.project-title {
    margin-bottom: var(--spacing-sm);
    font-size: 1.75rem;
}

.project-description {
    color: var(--color-secondary);
    margin-bottom: var(--spacing-md);
    font-size: 1.125rem;
    line-height: 1.6;
}

.project-details {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--color-border);
}

.project-impact h4,
.project-approach h4,
.project-tech h4 {
    font-size: 1rem;
    margin-bottom: var(--spacing-sm);
    color: var(--color-primary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-size: 0.875rem;
}

.project-impact ul,
.project-approach ul {
    list-style: none;
}

.project-impact li,
.project-approach li {
    padding: 0.4rem 0;
    color: var(--color-secondary);
    font-size: 0.95rem;
}

.project-impact li:before,
.project-approach li:before {
    content: "✓ ";
    color: var(--color-primary);
    font-weight: bold;
    margin-right: 0.5rem;
}

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

.tech-tags span {
    padding: 0.4rem 0.8rem;
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 20px;
    font-size: 0.875rem;
    color: var(--color-secondary);
    font-family: var(--font-mono);
}

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

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

.timeline {
    max-width: 800px;
    margin: var(--spacing-lg) auto 0;
    position: relative;
}

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

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

.timeline-item:before {
    content: '';
    position: absolute;
    left: -6px;
    top: 0;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background-color: var(--color-primary);
    border: 3px solid var(--color-bg);
}

.timeline-date {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-xs);
}

.timeline-content h3 {
    margin-bottom: 0.25rem;
    font-size: 1.5rem;
}

.timeline-content h4 {
    color: var(--color-text-muted);
    font-weight: 500;
    margin-bottom: var(--spacing-sm);
}

/* Company Header with Logo */
.company-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

.company-logo {
    width: 48px;
    height: 48px;
    object-fit: contain;
    flex-shrink: 0;
    background-color: var(--color-white);
    padding: 0.5rem;
    border-radius: 8px;
    border: 1px solid var(--color-border);
}

.company-info {
    flex: 1;
}

.company-info h3 {
    margin-bottom: 0.25rem;
}

.company-info h4 {
    margin-bottom: 0;
}

.timeline-content p {
    color: var(--color-secondary);
    margin-bottom: var(--spacing-sm);
}

.timeline-content ul {
    list-style: none;
    margin-top: var(--spacing-sm);
}

.timeline-content li {
    padding: 0.4rem 0;
    color: var(--color-secondary);
    font-size: 0.95rem;
}

.timeline-content li:before {
    content: "• ";
    color: var(--color-primary);
    font-weight: bold;
    margin-right: 0.5rem;
}

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

.contact-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
    max-width: 900px;
    margin: var(--spacing-lg) auto 0;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background-color: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    text-decoration: none;
    color: var(--color-primary);
    transition: all var(--transition-fast);
}

.contact-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.08);
    border-color: var(--color-primary);
}

.contact-icon {
    font-size: 1.5rem;
}

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

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

.footer p {
    margin: 0;
    font-size: 0.95rem;
}

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

@media (max-width: 768px) {
    .nav-links {
        gap: var(--spacing-sm);
    }
    
    .nav-links a {
        font-size: 0.875rem;
    }
    
    .hero {
        min-height: 80vh;
    }
    
    .hero-cta {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
        text-align: center;
    }
    
    .project-details {
        grid-template-columns: 1fr;
    }
    
    .timeline:before {
        left: 0;
    }
    
    .timeline-item {
        padding-left: var(--spacing-md);
    }
    
    .company-header {
        flex-direction: row;
        align-items: flex-start;
    }
    
    .company-logo {
        width: 40px;
        height: 40px;
        padding: 0.375rem;
    }
}

@media (min-width: 769px) {
    .about-content {
        grid-template-columns: 1.5fr 1fr;
    }
    
    .project-details {
        grid-template-columns: 1fr 1fr;
    }
    
    .project-tech {
        grid-column: 1 / -1;
    }
}

/* ============================================
   ANIMATIONS
   ============================================ */

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

.hero-content,
.project-card,
.timeline-item {
    animation: fadeInUp 0.6s ease-out;
}

.project-card:nth-child(1) { animation-delay: 0.1s; }
.project-card:nth-child(2) { animation-delay: 0.2s; }
.project-card:nth-child(3) { animation-delay: 0.3s; }

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

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

.mt-lg {
    margin-top: var(--spacing-lg);
}

.mb-lg {
    margin-bottom: var(--spacing-lg);
}