:root {
    --color-bg: #ffffff;
    --color-text: #111827;
    --color-primary: #2563eb;
    --color-primary-hover: #1d4ed8;
    --color-surface: #f3f4f6;
    --color-border: #e5e7eb;
    --color-success: #16a34a;
    --color-error: #dc2626;

    --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
    --max-width: 1200px;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 2rem;
}

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

body {
    font-family: var(--font-sans);
    line-height: 1.5;
    color: var(--color-text);
    background: var(--color-bg);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    width: 100%;
}

header {
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    padding: var(--spacing-md) 0;
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

nav a {
    color: var(--color-text);
    text-decoration: none;
    margin-left: var(--spacing-lg);
    font-weight: 500;
}

nav a:hover {
    color: var(--color-primary);
}

main {
    flex: 1;
    padding: var(--spacing-lg) 0;
}

h1,
h2,
h3 {
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    position: static !important;
    /* Force static to prevent unwanted stickiness */
}

h1 {
    font-size: 2.5rem;
    font-weight: 700;
}

h2 {
    font-size: 1.75rem;
    font-weight: 600;
}

h3 {
    font-size: 1.25rem;
    font-weight: 600;
}

p {
    margin-bottom: var(--spacing-md);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.5rem 1rem;
    border-radius: 0.375rem;
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    border: none;
    transition: background-color 0.2s;
}

.btn-primary {
    background: var(--color-primary);
    color: white;
}

.btn-primary:hover {
    background: var(--color-primary-hover);
}

/* Calculator Widget Styles */
.calculator-widget {
    background: var(--color-surface);
    border-radius: 0.75rem;
    padding: var(--spacing-lg);
    margin: var(--spacing-lg) 0;
    box-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1);
}

.calc-controls {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

label {
    font-size: 0.875rem;
    font-weight: 500;
}

input,
select {
    padding: 0.5rem;
    border: 1px solid var(--color-border);
    border-radius: 0.375rem;
    font-size: 1rem;
}

.results-panel {
    background: white;
    padding: var(--spacing-md);
    border-radius: 0.5rem;
    margin-top: var(--spacing-lg);
    border: 1px solid var(--color-border);
}

.result-row {
    display: flex;
    justify-content: space-between;
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--color-border);
}

.result-row:last-child {
    border-bottom: none;
}

.result-label {
    color: #6b7280;
}

.result-value {
    font-family: monospace;
    font-weight: 600;
}

footer {
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-lg) 0;
    margin-top: auto;
    color: #6b7280;
}