/* ==========
    CSS Reset (light)
========== */
/* Use a simple box model that is easy to reason about */
*, *::before, *::after {
    box-sizing: border-box;
}

/* Remove default margins without being agressive */
body, h1, h2, h3, p, ul {
    margin: 0;
}

/* ==========
    CSS Variables
========== */
:root {
    /* Color Palette */
    --color-text: #1a1a1a;
    --color-background: #f9f9f7;
    --color-accent: #6b4eff;

    /* Typography */
    --font-body: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    --font-size-sm: 0.95rem;
    --font-size-base: 1rem;
    --font-size-md: 1.25rem;
    --font-size-lg: 1.75rem;
    --font-size-xl: 2.25rem;
    --line-height-base: 1.6;

    /* Spacing Scale */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 2rem;
    --space-lg: 3rem;

    /* Layout */
    --max-width: 64rem;

    /* Card effects */
    --color-card-background: #f3f3f1;
    --color-card-hover: #eeeeeb;
    --shadow-card: 0px 6px rgba(0, 0, 0,0.06);
    --shadow-card-hover: 0 4px 10px rgba(0, 0, 0, 0.08)
}

/* ==========
    Base Styles
========== */
body {
    font-family: var(--font-body);
    font-size: var(--font-size-base);
    line-height: var(--line-height-base);
    color: var(--color-text);
    background-color: var(--color-background);
}

/* Keep content readable and centered */
main, header, footer {
    max-width: var(--max-width);
    padding: var(--space-md);
    margin-inline: auto;
}

/* ==========
    Headings
========== */
h1, h2, h3 {
    line-height: 1.25;
}

/*Visual seperation without styling commitment */
h2 {
    margin-top: var(--space-lg);
    margin-bottom: var(--space-sm);
}

h3 {
    margin-bottom: var(--space-xs);
}

/* ==========
    Text Elements
========== */
p {
    margin-bottom: var(--space-sm);
}

/* ==========
    Lists
========== */
ul {
    list-style: none;
    padding: 0;
}

/* ==========
    Links
========== */
a {
    color: var(--color-accent);
    text-decoration: underline;
    text-decoration-thickness: 1px;
    text-underline-offset: 0.15em;
    transition: text-underline-offset 0.15s ease;
}

a:focus-visible {
    outline: 3px solid var(--color-accent);
    outline-offset: 2px;
}

:focus {
    outline: none;
}

/* ==========
    Skip Link
========== */
.skip-link {
    position: absolute;
    top: 0;
    left: 0;
    padding: var(--space-xs) var(--space-sm);
    background-color: var(--color-background);
    color: var(--color-text);
    transform: translateY(-100%);
}

.skip-link:focus {
    transform: translateY(0);
}

/* ==========
    Portfolio Items
========== */

/* Space between projects */
ul > li {
    margin-bottom: var(--space-md);
}

/* Project Container */
article {
    padding: var(--space-sm);
    background-color: var(--color-card-background);
    border-radius: 0.5rem;
    box-shadow: var(--shadow-card);
    transition: transform 0.15s;
}

/* Project images shouild never overflow */
article img {
    display: block;
    max-width: 100%;
    height: auto;
    margin-bottom: var(--space-sm);
}

/* ==========
    Responsive Project grid
========== */

/* Defailt: stacked layout (mobile-first) */
/* No grid needed here */

/* Grid layout for larger screens */
@media (min-width:48rem) {
    ul {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-md);
    }

    /* Remove extra spacing added for stacked layout */
    ul > li {
        margin-bottom: 0;
    }
}

/* Respect reduced motion preferences for accessibility */
@media (prefers-reduced-motion: reduce) {
    * {
        transition: none !important;
    }
}

/*  Optional wider layout */
@media (min-width: 64rem) {
    ul {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* ==========
    Light Hover States
========== */

/*Project container hover */
article {
    transition: border-color 0.15s ease, transform 0.15s ease;
}

article:hover, article:focus-within {
    transform: translateY(-2px);
    box-shadow: var(--shadow-card-hover);
}

article:hover img, article:focus-within img {
    opacity: 0.95;
}

/* Project link hover */
article a {
    font-weight: 500;
}

article a:hover, article a:focus-visible {
    text-decoration-thickness: 2px;
    text-underline-offset: 0.25em;
}

/* ==========
    Typography Scale
========== */

/* Page title */
h1 {
    font-size: var(--font-size-xl);
}

/* Section headings */
h2 {
    font-size: var(--font-size-lg);
}

/* Project titles */
h3 {
    font-size: var(--font-size-md);
}

/* Body text */
p, a {
    font-size: var(--font-size-sm);
}

/* Optional small text (if you add captions later) */
small {
    font-size: var(--font-size-sm);
}