/* 
   ===============================================
   Design System & Premium Variables
   =============================================== 
*/
:root {
    /* Colors - Dark Mode Aesthetic */
    --bg-main: #0a0a0b;
    --bg-secondary: #0f1013;
    --bg-card: #15161a;
    --text-primary: #f0f0f2;
    --text-secondary: #9aa0a6;
    --accent: #fff;       /* Clean stark white for high contrast highlights */
    --accent-glow: rgba(255, 255, 255, 0.15); /* Very subtle white glow */
    --border-color: #27282b;
    
    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    
    /* Spacing & Layout */
    --max-width: 1100px;
    --section-pad: 120px 20px;
    --border-radius: 12px;
    
    /* Transitions */
    --transition-fast: 0.2s cubic-bezier(0.2, 0.8, 0.2, 1);
    --transition-slow: 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

/* 
   ===============================================
   Reset & Global
   =============================================== 
*/
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    scroll-behavior: smooth;
}

body {
    background-color: var(--bg-main);
    color: var(--text-primary);
    font-family: var(--font-sans);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 20px;
}

.section {
    padding: var(--section-pad);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 3rem;
    letter-spacing: -0.03em;
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 0;
    width: 40px;
    height: 3px;
    background-color: var(--accent);
}

/* Background gradient orb to add subtle "premium" depth */
.glow-bg {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 60vw;
    height: 60vh;
    background: radial-gradient(circle, var(--accent-glow) 0%, transparent 60%);
    z-index: -1;
    pointer-events: none;
    filter: blur(100px);
}

/* 
   ===============================================
   Typography & Buttons
   =============================================== 
*/
h1, h2, h3, h4, h5 {
    color: var(--text-primary);
}

a {
    color: var(--text-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.highlight {
    color: var(--text-secondary); /* Minimalist sub-tone */
    font-style: italic;
}

.btn {
    display: inline-block;
    padding: 12px 28px;
    border-radius: 30px;
    font-size: 0.95rem;
    font-weight: 500;
    transition: all var(--transition-fast);
    cursor: pointer;
    border: 1px solid transparent;
}

.btn-primary {
    background-color: var(--accent);
    color: var(--bg-main);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(255,255,255,0.1);
}

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

.btn-outline:hover {
    border-color: var(--accent);
    background-color: rgba(255,255,255,0.05);
}

/* 
   ===============================================
   Navbar
   =============================================== 
*/
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    padding: 20px 0;
    z-index: 1000;
    background: rgba(10, 10, 11, 0.7);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(255,255,255,0.03);
    transition: padding var(--transition-fast);
}

.navbar.scrolled {
    padding: 15px 0;
    background: rgba(10, 10, 11, 0.9);
}

.nav-content {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-weight: 700;
    font-size: 1.2rem;
    letter-spacing: -0.02em;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-link {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    position: relative;
}

.nav-link:hover, .nav-link.active {
    color: var(--text-primary);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0%;
    height: 1px;
    background-color: var(--accent);
    transition: width var(--transition-fast);
}

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

.mobile-menu-btn {
    display: none;
    font-size: 1.5rem;
    cursor: pointer;
}

/* 
   ===============================================
   Hero Section
   =============================================== 
*/
.hero {
    min-height: 100vh;
}

.hero-title {
    font-size: clamp(3rem, 6vw, 5rem);
    line-height: 1.1;
    letter-spacing: -0.04em;
    margin-bottom: 1.5rem;
}

.hero-subtitle {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 3rem;
    max-width: 500px;
}

.hero-actions {
    display: flex;
    gap: 1rem;
}

/* 
   ===============================================
   CV Section
   =============================================== 
*/
.cv-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
}

.cv-col-title {
    font-size: 1.5rem;
    margin-bottom: 2rem;
    display: flex;
    align-items: center;
    gap: 0.8rem;
    color: var(--text-primary);
}

.cv-col-title i {
    color: var(--text-secondary);
}

.timeline {
    position: relative;
    padding-left: 30px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 5px;
    bottom: 0;
    width: 1px;
    background-color: var(--border-color);
}

.timeline-item {
    position: relative;
    margin-bottom: 3rem;
}

.timeline-dot {
    position: absolute;
    left: -34px;
    top: 5px;
    width: 9px;
    height: 9px;
    background-color: var(--bg-main);
    border: 2px solid var(--text-secondary);
    border-radius: 50%;
    transition: all var(--transition-fast);
}

.timeline-item:hover .timeline-dot {
    border-color: var(--accent);
    background-color: var(--accent);
}

.timeline-item h4 {
    font-size: 1.1rem;
    margin-bottom: 0.3rem;
}

.timeline-date {
    display: block;
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
    font-family: monospace;
}

.timeline-item p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* 
   ===============================================
   Programmer Portfolio Section
   =============================================== 
*/
.project-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.project-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 2.5rem 2rem;
    transition: all var(--transition-fast);
    position: relative;
    overflow: hidden;
}

.project-card:hover {
    transform: translateY(-5px);
    border-color: rgba(255,255,255,0.1);
    box-shadow: 0 20px 40px rgba(0,0,0,0.4);
}

.project-icon {
    font-size: 2rem;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.project-card h3 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
}

.project-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 2rem;
}

.tech-stack {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.tech-tag {
    font-size: 0.75rem;
    padding: 4px 10px;
    background-color: rgba(255,255,255,0.05);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    color: var(--text-secondary);
}

/* 
   ===============================================
   Tester Section
   =============================================== 
*/
.qa-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.qa-card {
    padding: 2.5rem;
    border-radius: var(--border-radius);
    background: linear-gradient(145deg, var(--bg-card), var(--bg-secondary));
    border: 1px solid var(--border-color);
    text-align: center;
    transition: transform var(--transition-fast);
}

.qa-card:hover {
    transform: translateY(-5px);
}

.qa-icon {
    font-size: 2.5rem;
    color: var(--text-primary);
    margin-bottom: 1.5rem;
    opacity: 0.8;
}

.qa-card h3 {
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

.qa-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* 
   ===============================================
   Contact Section
   =============================================== 
*/
.contact {
    align-items: center;
    text-align: center;
    min-height: 80vh;
}

.contact .section-title::after {
    left: 50%;
    transform: translateX(-50%);
}

.contact-subtitle {
    color: var(--text-secondary);
    margin-bottom: 3rem;
    font-size: 1.1rem;
}

.social-links {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    flex-wrap: wrap;
}

.social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    font-size: 1.5rem;
    transition: all var(--transition-fast);
}

.social-link:hover {
    background-color: var(--text-primary);
    color: var(--bg-main);
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(255,255,255,0.1);
}

.social-link svg {
    fill: currentColor;
}

/* 
   ===============================================
   Footer
   =============================================== 
*/
.footer {
    text-align: center;
    padding: 2rem;
    border-top: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-size: 0.85rem;
}

/* 
   ===============================================
   Animations (Intersection Observer)
   =============================================== 
*/
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* 
   ===============================================
   Media Queries
   =============================================== 
*/
@media (max-width: 768px) {
    .nav-links {
        display: none; /* simple mobile nav for now */
    }
    
    .mobile-menu-btn {
        display: block;
    }
    
    .cv-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .section {
        padding: 80px 20px;
    }
}