/* Base Styles */
:root {
    --primary-color: #1d4ed8;
    --primary-hover: #1e40af;
    --secondary-color: #f0f9ff;
    --text-color: #1f2937;
    --text-muted: #6b7280;
    --border-color: #e5e7eb;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 2px 4px -1px rgba(0, 0, 0, 0.1);
    --radius: 0.375rem;
    --transition: all 0.15s ease-in-out;
}

/* Layout Gaps and Spacing */
body {
    line-height: 1.3;
    color: var(--text-color);
    background-color: #f9fafb;
    margin: 0;
    padding: 0.25rem;
}

/* Main Grid Layout */
main {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 0.25rem;
    padding: 0;
    max-width: 100%;
    margin: 0 auto;
    box-sizing: border-box;
}

/* Calculator Cards */
.calculator-card {
    background: white;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 0.75rem;
    transition: var(--transition);
    height: 100%;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin: 0.125rem;
    box-sizing: border-box;
}

.calculator-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

/* Input Groups */
.input-group {
    display: flex;
    flex-direction: column;
    gap: 0.05rem;
    margin-bottom: 0.25rem;
}

.input-label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-color);
}

/* Form Elements */
input[type="number"],
input[type="text"],
select {
    width: 100%;
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 0.375rem;
    font-size: 0.875rem;
    transition: var(--transition);
}

input[type="number"]:focus,
input[type="text"]:focus,
select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(29, 78, 216, 0.1);
}

/* Buttons */
button,
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.5rem 1rem;
    border-radius: 0.375rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    border: 1px solid transparent;
}

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

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

/* Output Sections */
.output-section {
    margin-top: auto;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

.output-value {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--primary-color);
    word-break: break-word;
}

/* Responsive Adjustments */
@media (min-width: 640px) {
    body {
        padding: 0.5rem;
    }
}

@media (min-width: 768px) {
    main {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    main {
        grid-template-columns: repeat(3, 1fr);
        max-width: 1400px;
    }
}

/* Remove default margins and padding */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* Remove extra margins and padding from elements */
h1, h2, h3, h4, h5, h6, p {
    margin: 0 0 0.25rem 0;
    line-height: 1.2;
}

.calculator-title {
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
}

/* Compact form elements */
input[type="number"],
input[type="text"],
select {
    padding: 0.3rem 0.4rem;
    margin: 0;
    font-size: 0.9rem;
    height: auto;
}

/* Utility Classes */
.mb-4 { margin-bottom: 1rem; }
.mt-4 { margin-top: 1rem; }
.mb-6 { margin-bottom: 1.5rem; }
.mt-6 { margin-top: 1.5rem; }
.text-sm { font-size: 0.875rem; }
.text-xs { font-size: 0.75rem; }
.text-muted { color: var(--text-muted); }
.text-center { text-align: center; }