@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

:root {
    --bg-body: #0f172a;
    --bg-surface: #1e293b;
    --bg-card: #1e293b;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --primary-color: #3b82f6;
    --primary-hover: #2563eb;
    --border-color: #334155;
    --input-bg: #0f172a;
    --success-color: #10b981;
    --error-color: #ef4444;
}

body {
    background-color: var(--bg-body);
    color: var(--text-primary);
    font-family: 'Inter', sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 0;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

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

a:hover {
    color: var(--primary-hover);
    text-decoration: underline;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    color: var(--text-primary);
    font-weight: 600;
    margin-bottom: 1rem;
}

.navbar {
    background-color: var(--bg-surface);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
}

.navbar-brand {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary) !important;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

.main-content {
    flex: 1;
    padding: 3rem 0;
}

.calculator-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.form-control {
    width: 100%;
    padding: 0.75rem 1rem;
    background-color: var(--input-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 1rem;
    transition: all 0.2s;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    width: 100%;
    font-size: 1rem;
    transition: background-color 0.2s;
}

.btn-primary:hover {
    background-color: var(--primary-hover);
    text-decoration: none;
}

.output-section {
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
    display: grid;
    gap: 1.5rem;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

.output-item {
    background-color: var(--bg-body);
    padding: 1rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.output-label {
    display: block;
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-bottom: 0.25rem;
}

.output-value {
    display: block;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

.content-section {
    color: var(--text-secondary);
    margin-top: 3rem;
    font-size: 1.05rem;
}

.content-section h2 {
    color: var(--text-primary);
    margin-top: 2rem;
    font-size: 1.5rem;
}

/* Footer Styles */
.footer {
    background-color: var(--secondary-color);
    color: #fff;
    padding: 60px 0 30px;
    margin-top: auto;
}

.footer h3 {
    color: #fff;
    margin-bottom: 2rem;
    font-weight: 700;
}

.footer-columns {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.footer-column h4 {
    color: var(--primary-color);
    font-size: 1.1rem;
    margin-bottom: 1rem;
    font-weight: 600;
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.footer-link {
    color: #b0b0b0;
    text-decoration: none;
    transition: color 0.2s;
    font-size: 0.9rem;
}

.footer-link:hover {
    color: #fff;
    text-decoration: none;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
    font-size: 0.9rem;
    color: #888;
}

.footer-nav {
    flex-wrap: wrap;
    justify-content: center;
}

.footer-nav a {
    color: var(--text-secondary);
    font-size: 0.9rem;
    text-decoration: none;
    transition: color 0.2s;
    display: inline-flex;
    align-items: center;
}

.footer-nav a:not(:last-child)::after {
    content: "·";
    margin: 0 0.75rem;
    color: var(--text-secondary);
    opacity: 0.5;
}

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

.copyright {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin: 0;
}