/* =================================================================== */
/*      MODERN PORTFOLIO CSS - PROFESSIONAL DARK THEME (FINAL)         */
/* =================================================================== */

:root {
    /* Color System - Professional Dark Palette */
    --primary-color: #3b82f6; /* A bright, friendly blue */
    --primary-dark: #2563eb;
    --secondary-color: #10b981; /* For highlights */
    --accent-color: #f59e0b;
    --warning-color: #ef4444;

    /* Neutral Colors - Dark Theme */
    --bg-primary: #111827;     /* Deep, near-black for main background */
    --bg-secondary: #1f2937;   /* Slightly lighter for cards, sections */
    --border-color: #374151;   /* For subtle borders */

    --text-primary: #f9fafb;     /* Bright, off-white for main text */
    --text-secondary: #9ca3af;   /* Muted gray for descriptions, subtext */
    --text-headings: #ffffff;    /* Pure white for headings to make them pop */
    
    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', Monaco, monospace;
    --font-display: 'Cal Sans', var(--font-sans);

    /* Spacing & Radius (kept the same) */
    --space-md: 1rem; --space-lg: 1.5rem; --space-xl: 2rem; --space-2xl: 3rem;
    --radius-md: 0.5rem; --radius-lg: 0.75rem; --radius-xl: 1rem;

    /* Shadows for Dark Mode */
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.2), 0 2px 4px -2px rgb(0 0 0 / 0.2);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.2), 0 4px 6px -4px rgb(0 0 0 / 0.2);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.3), 0 8px 10px -6px rgb(0 0 0 / 0.3);

    /* Animations */
    --transition-normal: 300ms ease-in-out;
}

/* Base Styles */
* { box-sizing: border-box; }
body {
    font-family: var(--font-sans);
    line-height: 1.6;
    color: var(--text-secondary); /* Muted text for paragraphs */
    background-color: var(--bg-primary); /* Dark main background */
    margin: 0;
    padding: 0;
    font-size: 16px;
}

/* Modern Navigation */
.navbar {
    background: rgba(17, 24, 39, 0.8); /* Semi-transparent dark bg */
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
}
.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}
.nav-logo {
    text-decoration: none;
}
.nav-logo img {
    filter: invert(100%); /* Makes a dark logo white */
}
.nav-links {
    display: flex;
    gap: var(--space-xl);
    list-style: none;
    margin: 0; padding: 0;
}
.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: color var(--transition-normal);
}
.nav-link:hover, .nav-link.active {
    color: var(--text-primary);
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: var(--space-2xl) var(--space-lg);
    background: var(--bg-primary);
}
.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-2xl);
    align-items: center;
}
.hero-content h1 {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 5vw, 4rem);
    color: var(--text-headings);
    margin: 0 0 var(--space-md);
}
.hero-tagline {
    font-size: 1.25rem;
    color: var(--primary-color);
    font-weight: 600;
}
.hero-description {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-2xl);
}
.hero-cta {
    display: flex;
    gap: var(--space-lg);
}

/* Buttons */
.btn {
    display: inline-flex;
    padding: var(--space-lg) var(--space-xl);
    border-radius: var(--radius-lg);
    font-weight: 600;
    text-decoration: none;
    transition: all var(--transition-normal);
    border: 2px solid transparent;
    cursor: pointer;
}
.btn-primary {
    background: var(--primary-color);
    color: white;
}
.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}
.btn-secondary {
    background: transparent;
    color: var(--text-primary);
    border-color: var(--border-color);
}
.btn-secondary:hover {
    border-color: var(--primary-color);
    background: var(--primary-color);
    color: white;
}

/* Section Styles */
.section {
    padding: var(--space-2xl) var(--space-lg);
}
.light-bg {
    background-color: var(--bg-secondary); /* Slightly lighter dark section */
}
.section-title {
    font-family: var(--font-display);
    font-size: 2.5rem;
    text-align: center;
    color: var(--text-headings);
    margin-bottom: var(--space-2xl);
}
.container {
    max-width: 1200px;
    margin: 0 auto;
}

/* Portfolio Grid & Cards */
.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--space-xl);
}
.project-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
}
.project-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-color);
}
.project-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
}
.project-content {
    padding: var(--space-xl);
}
.project-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-headings);
    margin-bottom: var(--space-md);
}
.project-description {
    color: var(--text-secondary);
    margin-bottom: var(--space-lg);
}
.project-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
}
.project-link:hover {
    color: var(--text-primary);
}

/* Footer */
.footer {
    padding: var(--space-2xl) var(--space-lg);
    text-align: center;
    border-top: 1px solid var(--border-color);
    color: var(--text-secondary);
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero-container { grid-template-columns: 1fr; text-align: center; }
    .hero-cta { justify-content: center; }
    .nav-links { display: none; /* Mobile menu would go here */ }
}