/* 
 * Design System - Dark, Clean, Minimal
 * Targeting: Engineering Managers, CTOs, Technical Recruiters
 */

:root {
    /* Colors */
    --bg-color: #0d1117;
    /* Very dark blue-grey (GitHub-like) */
    --bg-card: #161b22;
    --bg-card-hover: #1f262e;
    --text-primary: #f0f6fc;
    --text-secondary: #8b949e;
    --text-accent: #58a6ff;
    /* Blue accent */
    --text-success: #3fb950;
    /* Green for key metrics/impact */
    --border-color: #30363d;

    /* Gradients */
    --gradient-brand: linear-gradient(135deg, #58a6ff 0%, #8b949e 100%);

    /* Typography */
    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', source-code-pro, Menlo, Monaco, Consolas, "Courier New", monospace;

    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 2rem;
    --space-lg: 4rem;
    --space-xl: 5rem;

    /* Layout */
    --max-width: 1000px;
    --radius-sm: 6px;
    --radius-md: 12px;
}

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

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

a {
    color: var(--text-accent);
    text-decoration: none;
    transition: opacity 0.2s ease;
}

a:hover {
    text-decoration: underline;
}

ul {
    list-style: none;
}

.container {
    width: 90%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--space-sm);
}

/* Header & Nav */
header {
    padding: var(--space-md) 0;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: var(--space-lg);
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--text-primary);
    text-decoration: none;
}

.nav-links {
    display: flex;
    gap: var(--space-md);
}

.nav-links a {
    color: var(--text-secondary);
    font-weight: 500;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--text-primary);
    text-decoration: none;
}

.hamburger {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-primary);
    font-size: 1.5rem;
}

/* Mobile Menu Overlay */
.mobile-menu {
    display: none;
    /* JS will toggle this */
    position: absolute;
    top: 70px;
    left: 0;
    right: 0;
    background: var(--bg-card);
    padding: var(--space-md);
    border-bottom: 1px solid var(--border-color);
    flex-direction: column;
    gap: var(--space-sm);
    z-index: 100;
}

.mobile-menu.open {
    display: flex;
}

/* Sections */
section {
    margin-bottom: var(--space-xl);
}

h1,
h2,
h3 {
    line-height: 1.2;
    margin-bottom: var(--space-sm);
}

h1 {
    font-size: 3rem;
    font-weight: 800;
    letter-spacing: -0.02em;
}

h2 {
    font-size: 2rem;
    margin-bottom: var(--space-md);
    padding-bottom: var(--space-xs);
    border-bottom: 1px solid var(--border-color);
    color: var(--text-primary);
}

h3 {
    font-size: 1.25rem;
    color: var(--text-primary);
}

p {
    margin-bottom: var(--space-sm);
    color: var(--text-secondary);
    max-width: 65ch;
}

/* Hero Section */
.hero {
    padding: var(--space-lg) 0;
}

.hero-headline {
    font-size: 3.5rem;
    background: var(--gradient-brand);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--space-sm);
}

.hero-sub {
    font-size: 1.5rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-md);
}

.hero-focus-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-sm);
    margin-bottom: var(--space-md);
}

.focus-item {
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.focus-item::before {
    content: "▹";
    color: var(--text-accent);
}

.btn-primary {
    display: inline-block;
    background-color: var(--text-accent);
    color: #fff;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-sm);
    font-weight: 600;
    text-decoration: none;
    transition: transform 0.1s ease, filter 0.2s ease;
}

.btn-primary:hover {
    filter: brightness(1.1);
    text-decoration: none;
    transform: translateY(-1px);
}

/* Experience Timeline */
.timeline {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    border-left: 2px solid var(--border-color);
    padding-left: var(--space-md);
}

.role {
    position: relative;
}

.role::before {
    content: "";
    position: absolute;
    left: calc(-1 * var(--space-md) - 5px);
    top: 6px;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--text-accent);
    border: 2px solid var(--bg-color);
}

.role-header {
    margin-bottom: var(--space-xs);
}

.role-title {
    color: var(--text-primary);
    font-weight: 700;
}

.role-company {
    color: var(--text-secondary);
}

.role-period {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-sm);
}

.role-description li {
    margin-bottom: 0.25rem;
    color: var(--text-secondary);
    list-style: disc;
    margin-left: 1.25rem;
}

/* Skills/Tags */
.tag-container {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.tag {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: 0.25rem 0.75rem;
    border-radius: 999px;
    /* Pill shape */
    font-size: 0.85rem;
    color: var(--text-primary);
    font-family: var(--font-mono);
}

/* Project Cards */
.project-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-md);
}

.project-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--space-md);
    transition: border-color 0.2s ease, transform 0.2s ease;
}

.project-card:hover {
    border-color: var(--text-accent);
    transform: translateY(-2px);
    background-color: var(--bg-card-hover);
}

.project-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: var(--space-xs);
    flex-wrap: wrap;
    gap: var(--space-xs);
}

.project-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
}

.project-role {
    font-size: 0.9rem;
    color: var(--text-accent);
    font-family: var(--font-mono);
}

.project-summary {
    margin-bottom: var(--space-sm);
    font-style: italic;
}

.project-meta {
    margin-top: var(--space-sm);
    padding-top: var(--space-sm);
    border-top: 1px solid var(--border-color);
}

.meta-label {
    text-transform: uppercase;
    font-size: 0.75rem;
    color: var(--text-secondary);
    font-weight: 700;
    letter-spacing: 0.05em;
    margin-bottom: 0.25rem;
    display: block;
}

/* Footer */
footer {
    text-align: center;
    padding: var(--space-lg) 0;
    border-top: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 768px) {
    h1 {
        font-size: 2.5rem;
    }

    .hero-headline {
        font-size: 2.75rem;
    }

    .nav-links {
        display: none;
        /* Hide default nav, show hamburger driven one */
    }

    .hamburger {
        display: block;
    }
}

/* New Contact Section Styles */
.contact-container {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    margin-top: var(--space-md);
}

.contact-card {
    display: flex;
    align-items: center;
    padding: 1.5rem;
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    text-decoration: none;
    transition: all 0.2s ease;
    gap: 1.25rem;
}

.contact-card:hover {
    transform: translateY(-3px);
    border-color: var(--text-accent);
    background-color: var(--bg-card-hover);
    text-decoration: none;
    box-shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.5);
}

.contact-icon {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 48px;
    height: 48px;
    background-color: rgba(88, 166, 255, 0.1);
    border-radius: 50%;
    color: var(--text-accent);
}

.contact-icon svg {
    width: 24px;
    height: 24px;
    fill: currentColor;
}

.contact-info {
    display: flex;
    flex-direction: column;
}

.contact-label {
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.contact-value {
    font-size: 1.1rem;
    color: var(--text-primary);
    font-weight: 500;
}

/* Responsive grid for contact cards */
@media (min-width: 600px) {
    .contact-container {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
    }
}