/* Define CSS Variables for a Dark Mode theme */
:root {
    --bg-color: #0f172a;           /* Dark blue background */
    --card-bg: #1e293b;            /* Slightly lighter dark blue for cards */
    --text-primary: #f8fafc;       /* Bright white for main text */
    --text-secondary: #94a3b8;     /* Grayish-blue for secondary text */
    --accent: #3b82f6;             /* A pleasant blue for accents */
    --hover-accent: #60a5fa;       /* Lighter blue for hover effects */
}

/* Base styles for the document body */
body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    margin: 0;
    line-height: 1.6;
}

/* Layout Container: Centers the content and limits its width */
.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem;
    display: flex;
    flex-direction: column;
    gap: 4rem; /* Spacing between sections */
}

/* Hero / Title Area: Designed to take up most of the initial screen */
.hero-section {
    height: 80vh; /* Takes 80% of the viewport height */
    display: flex;
    flex-direction: column;
    justify-content: center; /* Center content vertically */
    align-items: center;     /* Center content horizontally */
    text-align: center;
}

/* Styling for the main headline */
.hero-section h1 {
    font-size: 4rem;
    margin: 0;
    /* Creates a gradient text effect */
    background: linear-gradient(to right, #fff, var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* Styling for the subtitle */
.subtitle {
    font-size: 1.5rem;
    color: var(--text-secondary);
}

/* 'About Me' Card styling */
.bio-card {
    background-color: var(--card-bg);
    padding: 2rem;
    border-radius: 12px;
    border-left: 4px solid var(--accent); /* Accent color on the left border */
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

/* Styling for section headers */
h2 {
    font-size: 2rem;
    margin-bottom: 1.5rem;
    border-bottom: 2px solid var(--card-bg);
    padding-bottom: 0.5rem;
    display: inline-block; /* Makes the underline only cover the text */
}

/* Grid for the Social Links */
.grid-links {
    display: grid;
    /* Responsive grid: auto-fits cards with a minimum width of 250px */
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

/* Styling for the individual Social Link cards */
.social-card {
    background-color: var(--card-bg);
    padding: 1.5rem;
    border-radius: 12px;
    text-decoration: none;
    color: var(--text-primary);
    /* Transition for smooth hover effect */
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275); 
    border: 1px solid transparent;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

/* Styling for the emoji/icon inside the card */
.social-card .icon {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

/* Styling for the card title */
.social-card h3 {
    margin: 0;
    font-size: 1.2rem;
}

/* Styling for the card subtitle/description */
.social-card p {
    margin: 0.5rem 0 0 0;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* --- ANIMATIONS --- */

/* Hover Effect: Scale up and slight lift/shadow */
.social-card:hover {
    transform: scale(1.05) translateY(-5px); /* Makes it 5% bigger and lifts it 5px */
    background-color: #263345;
    border-color: var(--accent);
    box-shadow: 0 10px 15px -3px rgba(59, 130, 246, 0.2);
}

/* Keyframe definition for 'fade in up' animation */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(40px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Initial animation for the title/hero section (loads immediately) */
.fade-in {
    animation: fadeInUp 1s ease-out forwards;
}

/* Scroll Animation: Elements fade in as they enter the viewport */
.scroll-reveal {
    animation: fadeInUp 1s ease-out forwards;
    /* Uses CSS View Timeline for true scroll-based animation (modern browser feature) */
    animation-timeline: view();
    animation-range: entry 10% cover 30%; /* Triggers when 10% of element enters and ends when 30% of viewport is covered */
    
    /* Fallback: Start invisible */
    opacity: 0; 
}

/* Fallback for browsers that do not support 'animation-timeline: view()' */
@supports not (animation-timeline: view()) {
    .scroll-reveal {
        /* If scroll-reveal is not supported, just make the element visible */
        opacity: 1;
        transform: none;
    }
}