:root {
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    --max-width: 640px;
    --spacing: 1.5rem;
}

/* Light theme (default) */
:root,
[data-theme="light"] {
    --bg: #ffffff;
    --bg-secondary: #f5f5f5;
    --text: #1a1a1a;
    --text-secondary: #666666;
    --accent: #2563eb;
    --accent-hover: #1d4ed8;
    --border: #e5e5e5;
}

/* Dark theme */
[data-theme="dark"] {
    --bg: #0f0f0f;
    --bg-secondary: #1a1a1a;
    --text: #ededed;
    --text-secondary: #a0a0a0;
    --accent: #60a5fa;
    --accent-hover: #93c5fd;
    --border: #2a2a2a;
}

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

html {
    font-size: 16px;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg);
    color: var(--text);
    line-height: 1.7;
    transition: background-color 0.2s ease, color 0.2s ease;
    min-height: 100vh;
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: calc(var(--spacing) * 3) var(--spacing);
}

/* Header */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: calc(var(--spacing) * 2);
}

h1 {
    font-size: 1.75rem;
    font-weight: 600;
    letter-spacing: -0.02em;
}

h2 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Theme toggle */
#theme-toggle {
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 0.5rem;
    color: var(--text-secondary);
    transition: color 0.2s ease, background-color 0.2s ease;
}

#theme-toggle:hover {
    color: var(--text);
    background-color: var(--bg-secondary);
}

[data-theme="light"] .sun-icon,
[data-theme="dark"] .moon-icon {
    display: none;
}

[data-theme="light"] .moon-icon,
[data-theme="dark"] .sun-icon {
    display: block;
}

/* Main content */
main {
    margin-bottom: calc(var(--spacing) * 3);
}

section {
    margin-bottom: calc(var(--spacing) * 1.5);
}

section:last-child {
    margin-bottom: 0;
}

.intro p {
    font-size: 1.125rem;
    margin-bottom: 1rem;
}

.intro p:last-child {
    margin-bottom: 0;
}

.skills p {
    margin-bottom: 0.25rem;
    color: var(--text-secondary);
}

.skills strong {
    color: var(--text);
}

.personal {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

strong {
    font-weight: 600;
}

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

a:hover {
    color: var(--accent-hover);
}

/* Footer */
footer {
    border-top: 1px solid var(--border);
    padding-top: var(--spacing);
}

.social-links {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
}

.social-links a {
    color: var(--text-secondary);
    transition: color 0.2s ease, transform 0.2s ease;
}

.social-links a:hover {
    color: var(--text);
    transform: translateY(-2px);
}

.built-with {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

/* Mobile adjustments */
@media (max-width: 480px) {
    .container {
        padding: calc(var(--spacing) * 2) var(--spacing);
    }

    h1 {
        font-size: 1.5rem;
    }

    .intro p {
        font-size: 1rem;
    }
}