/* Base styles */
:root {
    /* Light theme variables */
    --primary-color: #2563eb;
    --text-color: #1f2937;
    --bg-color: #ffffff;
    --nav-bg: #f8fafc;
    --border-color: #e5e7eb;
    --card-bg: #ffffff;
    --card-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
}

[data-theme="dark"] {
    /* Dark theme variables */
    --primary-color: #60a5fa;
    --text-color: #e5e7eb;
    --bg-color: #111827;
    --nav-bg: #1f2937;
    --border-color: #374151;
    --card-bg: #1f2937;
    --card-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.2), 0 2px 4px -1px rgba(0, 0, 0, 0.1);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
}

/* Navigation */
.site-nav {
    background-color: var(--nav-bg);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.site-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-color);
    text-decoration: none;
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-link {
    color: var(--text-color);
    text-decoration: none;
    font-weight: 500;
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary-color);
}

/* Main content */
main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem 1.5rem;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: 1rem;
}

h1 {
    font-size: 2.5rem;
}

h2 {
    font-size: 2rem;
}

h3 {
    font-size: 1.75rem;
}

p {
    margin-bottom: 1.5rem;
}

/* Links */
a {
    color: var(--primary-color);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

/* Responsive design */
@media (max-width: 768px) {
    .nav-container {
        flex-direction: column;
        gap: 1rem;
    }

    .nav-links {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
}

/* Theme toggle button */
.theme-toggle {
    background: none;
    border: none;
    padding: 0.5rem;
    cursor: pointer;
    color: var(--text-color);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
}

.theme-toggle:hover {
    color: var(--primary-color);
}

.theme-toggle svg {
    width: 1.25rem;
    height: 1.25rem;
}

/* Update existing styles for dark mode compatibility */
body {
    background-color: var(--bg-color);
}

.project-card {
    background-color: var(--card-bg);
}

.tag {
    background-color: var(--nav-bg);
}

/* Dark mode specific adjustments */
[data-theme="dark"] .project-card:hover {
    box-shadow: var(--card-shadow);
}

[data-theme="dark"] img {
    opacity: 0.8;
}