/* ============================================
   CSS CUSTOM PROPERTIES (DESIGN SYSTEM)
   ============================================ */
:root {
    /* Colors - Premium Dark Theme */
    --color-bg: #0a0a0a;
    --color-bg-secondary: #111111;
    --color-text: #e0e0e0;
    --color-text-muted: #888888;
    --color-primary: #ffffff;
    --color-accent: #333333;
    --color-border: #222222;
    
    /* Gradients */
    --gradient-surface: linear-gradient(145deg, #111111, #0a0a0a);
    
    /* Typography */
    --font-heading: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    
    /* Fluid Typography */
    --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
    --text-sm: clamp(0.875rem, 0.8rem + 0.375vw, 1rem);
    --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
    --text-lg: clamp(1.125rem, 1.05rem + 0.375vw, 1.25rem);
    --text-xl: clamp(1.25rem, 1.15rem + 0.5vw, 1.5rem);
    --text-2xl: clamp(1.5rem, 1.35rem + 0.75vw, 2rem);
    --text-3xl: clamp(2rem, 1.8rem + 1vw, 2.5rem);
    --text-4xl: clamp(2.5rem, 2.2rem + 1.5vw, 3.5rem);
    --text-5xl: clamp(3rem, 2.5rem + 2.5vw, 5rem);
    
    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 2rem;
    --space-lg: 4rem;
    --space-xl: 6rem;
    --space-2xl: 8rem;
    
    /* Layout */
    --container-max: 1000px; /* Wider for grid layout */
    --section-padding: var(--space-xl);
    
    /* Transitions */
    --transition-base: 0.4s cubic-bezier(0.2, 0, 0, 1);
}

/* ============================================
   RESET & BASE STYLES
   ============================================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    overflow-x: hidden;
}

body {
    font-family: var(--font-body);
    font-size: var(--text-base);
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-bg);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    background-image: 
        linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
    background-size: 40px 40px;
    background-attachment: fixed;
}

/* ============================================
   TYPOGRAPHY
   ============================================ */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 600;
    line-height: 1.1;
    color: var(--color-primary);
    letter-spacing: -0.02em;
}

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

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

/* ============================================
   LAYOUT UTILITIES
   ============================================ */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--space-sm);
}

.section {
    padding: var(--section-padding) 0;
    position: relative;
}

.section-title {
    font-size: var(--text-3xl);
    font-weight: 500;
    margin-bottom: var(--space-lg);
    color: var(--color-text-muted);
    opacity: 0.6;
    border-bottom: 1px solid var(--color-border);
    padding-bottom: var(--space-md);
}

.section-content {
    color: var(--color-text-muted);
}

/* ============================================
   HERO SECTION
   ============================================ */
.hero {
    min-height: 90vh;
    display: flex;
    align-items: center;
    justify-content: flex-start;
    position: relative;
    padding: var(--space-2xl) 0;
}

.hero-title {
    font-size: var(--text-5xl);
    font-weight: 700;
    margin-bottom: var(--space-sm);
    letter-spacing: -0.04em;
    line-height: 1;
}

.hero-subtitle {
    font-size: var(--text-xl);
    font-weight: 400;
    color: var(--color-text-muted);
    margin-bottom: var(--space-md);
    max-width: 600px;
}

.hero-contact {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-sm);
    font-size: var(--text-sm);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.contact-link {
    color: var(--color-text-muted);
    padding-bottom: 4px;
    border-bottom: 1px solid transparent;
}

.contact-link:hover {
    color: var(--color-primary);
    border-bottom-color: var(--color-primary);
}

.separator {
    color: var(--color-border);
}

/* ============================================
   PROFILE SECTION
   ============================================ */
.profile-text {
    font-size: var(--text-lg);
    line-height: 1.8;
    margin-bottom: var(--space-md);
    max-width: 800px;
    color: var(--color-text);
}

/* ============================================
   EXPERIENCE SECTION (REDESIGNED)
   ============================================ */
.experience-item {
    display: grid;
    grid-template-columns: 180px 1fr; /* Fixed date column + flexible content */
    gap: var(--space-md);
    margin-bottom: var(--space-xl);
    padding-bottom: var(--space-xl);
    border-bottom: 1px solid var(--color-border);
    align-items: flex-start; /* Align to top */
}

.experience-item:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.experience-date {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    font-family: monospace;
    opacity: 0.8;
    padding-top: 6px; /* Align visually with title */
}



.experience-title {
    font-size: var(--text-xl);
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: 4px;
    line-height: 1.2;
}

.experience-company {
    font-size: var(--text-base);
    color: var(--color-text);
    margin-bottom: var(--space-sm);
    font-style: normal;
    font-weight: 500;
}

.experience-list {
    list-style: none;
}

.experience-list li {
    position: relative;
    padding-left: var(--space-md);
    margin-bottom: var(--space-sm);
    color: var(--color-text-muted);
    font-size: var(--text-base);
    line-height: 1.6;
}

.experience-list li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--color-border);
    transition: color var(--transition-base);
}

.experience-item:hover .experience-list li::before {
    color: var(--color-primary);
}

/* ============================================
   SKILLS SECTION
   ============================================ */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-md);
}

.skill-category {
    padding: var(--space-md);
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: 4px;
    transition: transform var(--transition-base), border-color var(--transition-base);
}

.skill-category:hover {
    transform: translateY(-4px);
    border-color: var(--color-text-muted);
}

.skill-category-title {
    font-size: var(--text-sm);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--space-sm);
    color: var(--color-text-muted);
    border-bottom: 1px solid var(--color-border);
    padding-bottom: var(--space-xs);
}

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

.skill-list li {
    padding: 4px 0;
    color: var(--color-text);
    font-size: var(--text-base);
}

/* ============================================
   EDUCATION SECTION
   ============================================ */
.education-item {
    display: grid;
    grid-template-columns: 180px 1fr;
    gap: var(--space-md);
    margin-bottom: var(--space-lg);
    padding-bottom: var(--space-lg);
    border-bottom: 1px solid var(--color-border);
    align-items: flex-start;
}

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

.education-title {
    font-size: var(--text-lg);
    color: var(--color-primary);
    margin-bottom: 4px;
    line-height: 1.2;
}

.education-date {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    font-family: monospace;
    opacity: 0.8;
    padding-top: 4px;
}

.education-institution {
    font-size: var(--text-base);
    color: var(--color-text-muted);
    margin-bottom: var(--space-xs);
}

.education-details {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    opacity: 0.8;
}

.certifications {
    margin-top: var(--space-xl);
    padding-top: var(--space-lg);
    border-top: 1px solid var(--color-border);
}

.certification-heading {
    font-size: var(--text-lg);
    margin-bottom: var(--space-sm);
}

.certification-list li {
    margin-bottom: var(--space-xs);
    color: var(--color-text-muted);
}

/* ============================================
   CONTACT SECTION
   ============================================ */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-md);
}

.contact-item {
    padding: var(--space-md);
    border: 1px solid var(--color-border);
    transition: all var(--transition-base);
}

.contact-item:hover {
    background: var(--color-bg-secondary);
    border-color: var(--color-text);
}

.contact-label {
    font-size: var(--text-xs);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-text-muted);
    margin-bottom: var(--space-xs);
}

.contact-value {
    font-size: var(--text-lg);
    color: var(--color-primary);
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
    padding: var(--space-lg) 0;
    text-align: left;
    border-top: 1px solid var(--color-border);
    margin-top: var(--space-2xl);
}

.footer-text {
    font-size: var(--text-xs);
    color: var(--color-text-muted);
    opacity: 0.5;
}

/* ============================================
   ANIMATIONS
   ============================================ */
/* REMOVED DEFAULT OPACITY 0 TO PREVENT INVISIBLE CONTENT */


/* ============================================
   RESPONSIVE DESIGN
   ============================================ */
@media (max-width: 768px) {
    :root {
        --section-padding: var(--space-lg);
    }
    
    .hero {
        align-items: center;
        text-align: center;
    }
    
    .hero-subtitle {
        margin-left: auto;
        margin-right: auto;
    }
    
    .hero-contact {
        justify-content: center;
    }
    
    /* Stack grid on mobile */
    .experience-item,
    .education-item {
        grid-template-columns: 1fr;
        gap: var(--space-sm);
    }
    
    .experience-date,
    .education-date {
        margin-bottom: var(--space-xs);
        opacity: 0.6;
    }
}