/* main.css - Global stylesheet */

:root {
    --font-primary: 'Inter', system-ui, -apple-system, sans-serif;
    --font-mono: 'Fira Code', monospace;
    --color-bg: #f9fafb;
    --color-surface: #ffffff;
    --color-primary: #2563eb;
    --color-primary-light: #3b82f6;
    --color-primary-dark: #1d4ed8;
    --color-muted: #6b7280;
    --color-muted-light: #9ca3af;
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-danger: #ef4444;
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 15px rgba(0,0,0,0.15);
}

/* Reset & base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}
html {
    font-size: 100%;
    scroll-behavior: smooth;
}
body {
    font-family: var(--font-primary);
    background-color: var(--color-bg);
    color: var(--color-muted);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    color: #111827;
    line-height: 1.25;
    margin-bottom: 0.5rem;
}
h1 { font-size: 2.25rem; }
h2 { font-size: 1.875rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1rem; }
h6 { font-size: 0.875rem; }

p {
    margin-bottom: 1rem;
}

/* Links */
a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color 0.2s ease;
}
a:hover,
a:focus {
    color: var(--color-primary-dark);
    text-decoration: underline;
}

/* Buttons */
.button {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    font-weight: 500;
    color: #ffffff;
    background-color: var(--color-primary);
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    text-align: center;
    transition: background-color 0.2s ease, transform 0.1s ease;
    box-shadow: var(--shadow-sm);
}
.button:hover {
    background-color: var(--color-primary-light);
}
.button:active {
    transform: scale(0.98);
}

/* Forms */
input,
textarea,
select,
button {
    font-family: inherit;
}
input,
textarea,
select {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid #d1d5db;
    border-radius: var(--radius-sm);
    background-color: #ffffff;
    color: #111827;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}
input:focus,
textarea:focus,
select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(37,99,235,0.2);
}

/* Utility classes */
.container {
    width: 100%;
    max-width: 1200px;
    margin-left: auto;
    margin-right: auto;
    padding: 0 1rem;
}
.mt-1 { margin-top: 0.25rem; }
.mt-2 { margin-top: 0.5rem; }
.mt-3 { margin-top: 1rem; }
.mb-1 { margin-bottom: 0.25rem; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-3 { margin-bottom: 1rem; }
.text-center { text-align: center; }
.flex { display: flex; }
.flex-col { flex-direction: column; }
.flex-row { flex-direction: row; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.gap-2 { gap: 0.5rem; }
.gap-4 { gap: 1rem; }
.rounded-sm { border-radius: var(--radius-sm); }
.rounded-md { border-radius: var(--radius-md); }
.rounded-lg { border-radius: var(--radius-lg); }

/* Card component */
.card {
    background-color: var(--color-surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    padding: 1.5rem;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

/* Navigation */
.navbar {
    background-color: #ffffff;
    box-shadow: var(--shadow-sm);
    padding: 0.75rem 1rem;
}
.navbar .logo {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--color-primary);
}
.navbar ul {
    list-style: none;
    display: flex;
    gap: 1.5rem;
}
.navbar a {
    font-weight: 500;
    color: var(--color-muted);
}
.navbar a:hover {
    color: var(--color-primary);
}

/* Footer */
.footer {
    background-color: #111827;
    color: #9ca3af;
    padding: 2rem 1rem;
    font-size: 0.875rem;
}
.footer a {
    color: #d1d5db;
}
.footer a:hover {
    color: #ffffff;
}

/* Responsive */
@media (max-width: 768px) {
    .navbar ul {
        flex-direction: column;
        gap: 0.75rem;
    }
    .flex-row {
        flex-direction: column;
    }
}
```