/* Shared Calculator Styles - Minimal Design */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --color-bg: #f8f9fa;
    --color-surface: #ffffff;
    --color-primary: #2563eb;
    --color-primary-hover: #1d4ed8;
    --color-text: #1f2937;
    --color-text-secondary: #6b7280;
    --color-border: #e5e7eb;
    --color-border-focus: #93c5fd;
    --color-success: #10b981;
    --color-error: #ef4444;
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
    background: var(--color-bg);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md);
    color: var(--color-text);
    line-height: 1.6;
}

.calculator-container {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    padding: var(--spacing-xl);
    width: 100%;
    max-width: 500px;
    margin: 0 auto;
}

.header {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.header h1 {
    color: var(--color-text);
    font-size: 1.875rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
    letter-spacing: -0.025em;
}

.header p {
    color: var(--color-text-secondary);
    font-size: 0.9375rem;
    line-height: 1.5;
}

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-row {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.form-row .form-group {
    flex: 1;
    margin-bottom: 0;
}

label {
    display: block;
    margin-bottom: var(--spacing-xs);
    color: var(--color-text);
    font-weight: 500;
    font-size: 0.875rem;
}

input[type="number"],
input[type="text"],
select {
    width: 100%;
    padding: 0.625rem 0.875rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: 0.9375rem;
    transition: all 0.15s ease;
    background: var(--color-surface);
    color: var(--color-text);
    font-family: inherit;
}

input[type="number"]:focus,
input[type="text"]:focus,
select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-border-focus);
}

input[type="number"]:invalid {
    border-color: var(--color-error);
}

select {
    cursor: pointer;
}

.unit-label {
    font-size: 0.8125rem;
    color: var(--color-text-secondary);
    margin-top: 0.25rem;
}

.help-text {
    font-size: 0.8125rem;
    color: var(--color-text-secondary);
    margin-top: 0.25rem;
}

.results {
    background: var(--color-surface);
    border: 2px solid var(--color-primary);
    color: var(--color-text);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    margin-top: var(--spacing-lg);
    text-align: center;
    min-height: 120px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.results.hidden {
    display: none;
}

.main-result {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
    color: var(--color-primary);
    letter-spacing: -0.025em;
}

.results-text {
    font-size: 1rem;
    color: var(--color-text-secondary);
}

.category {
    margin-top: var(--spacing-sm);
    padding: 0.5rem 1rem;
    background: var(--color-bg);
    border-radius: var(--radius-lg);
    font-weight: 500;
    display: inline-block;
    font-size: 0.9375rem;
    color: var(--color-text);
}

.secondary-result {
    margin-top: var(--spacing-md);
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--color-text);
}

.error {
    background: #fee2e2;
    color: #991b1b;
    border: 1px solid #fecaca;
    padding: var(--spacing-sm);
    border-radius: var(--radius-md);
    margin-top: var(--spacing-md);
    text-align: center;
    display: none;
    font-size: 0.9375rem;
}

.info-box {
    background: var(--color-bg);
    border-left: 3px solid var(--color-primary);
    padding: var(--spacing-sm);
    margin-top: var(--spacing-md);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    color: var(--color-text-secondary);
}

.info-box h3 {
    margin: 0 0 var(--spacing-sm) 0;
    font-size: 1rem;
    color: var(--color-text);
    font-weight: 600;
}

.info-box p {
    margin: 0;
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

.info-box a {
    color: var(--color-primary);
    text-decoration: underline;
}

.info-box a:hover {
    color: var(--color-primary-hover);
}

.back-link {
    display: inline-block;
    margin-bottom: var(--spacing-md);
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: 0.9375rem;
    transition: color 0.15s ease;
}

.back-link:hover {
    color: var(--color-primary);
}

/* Mobile responsiveness */
@media (max-width: 640px) {
    .calculator-container {
        padding: var(--spacing-lg);
        margin: var(--spacing-sm);
    }

    .header h1 {
        font-size: 1.5rem;
    }

    .form-row {
        flex-direction: column;
        gap: 0;
    }

    .form-row .form-group {
        margin-bottom: var(--spacing-md);
    }

    .main-result {
        font-size: 2rem;
    }
}

@media (max-width: 480px) {
    body {
        padding: var(--spacing-sm);
    }

    .calculator-container {
        padding: var(--spacing-md);
    }

    .header h1 {
        font-size: 1.375rem;
    }

    input[type="number"],
    input[type="text"],
    select {
        padding: 0.625rem 0.75rem;
        font-size: 16px; /* Prevents zoom on iOS */
    }
}


/* Calculator Card Styles for Index Page */
.calculator-grid {
    display: grid;
    gap: var(--spacing-md);
    margin: var(--spacing-lg) 0;
}

.calculator-card {
    background: var(--color-surface);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    border: 1px solid var(--color-border);
    transition: all 0.2s ease;
    text-decoration: none;
    color: inherit;
}

.calculator-card:hover {
    border-color: var(--color-primary);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.calculator-card h2 {
    color: var(--color-text);
    margin-bottom: var(--spacing-xs);
    font-size: 1.25rem;
    font-weight: 600;
    letter-spacing: -0.025em;
}

.calculator-card p {
    color: var(--color-text-secondary);
    line-height: 1.6;
    margin-bottom: 0;
    font-size: 0.9375rem;
}

.intro-text {
    text-align: center;
    max-width: 600px;
    margin: 0 auto var(--spacing-lg);
    color: var(--color-text-secondary);
    font-size: 0.9375rem;
    line-height: 1.6;
}

/* Index page specific container sizing */
.calculator-container.index {
    max-width: 800px;
}

/* GitHub Links Styling */
.github-links {
    text-align: center;
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--color-border);
}

.github-links a {
    color: var(--color-text-secondary);
    text-decoration: none;
    margin: 0 var(--spacing-sm);
    font-size: 0.875rem;
    transition: color 0.15s ease;
}

.github-links a:hover {
    color: var(--color-primary);
}

.github-links a:not(:last-child)::after {
    content: " •";
    color: var(--color-border);
    margin-left: var(--spacing-sm);
}

/* Pace Input Styles */
.pace-inputs {
    display: flex;
    gap: var(--spacing-xs);
    align-items: center;
}

.pace-inputs input {
    flex: 1;
}

.pace-separator {
    font-weight: 600;
    color: var(--color-text-secondary);
}