* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
}

html {
    overflow-y: scroll;
}

body {
    background-color: #f5f5f5;
    min-height: 100vh;
    padding-top: 0;
    margin: 0;
}

/* Header Styles */
.header {
    background-color: #003049;
    position: sticky;
    top: 0;
    z-index: 50;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    width: 100%;
}

.header-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

.header-content {
    height: 4rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo-section {
    display: flex;
    align-items: center;
}

.logo-link {
    display: flex;
    align-items: center;
    text-decoration: none;
    color: white;
    gap: 0.25rem;
}

.logo-icon {
    font-size: 2rem;
    color: white;
}

.logo-text {
    font-size: 1.25rem;
    font-weight: bold;
}

.beta-badge {
    background-color: #3b82f6;
    padding: 0.25rem 0.5rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    margin-left: 0.5rem;
}

.main-nav {
    display: flex;
    align-items: center;
}

.nav-link {
    display: flex;
    align-items: center;
    color: white;
    text-decoration: none;
    gap: 0.25rem;
    transition: color 0.2s;
}

.nav-link:hover {
    color: #bfdbfe;
}

/* Container and Calculator Wrapper */
.container {
    width: 100%;
    max-width: 600px;
    margin: 0 auto;
    padding: 0 20px;
}

.calculator-wrapper {
    background: white;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    padding: 24px;
    position: relative;
    margin-top: 20px;
}

h1 {
    background-color: #fcbf49;
    margin: -24px -24px 24px -24px;
    padding: 16px;
    border-top-left-radius: 8px;
    border-top-right-radius: 8px;
    color: #333;
    font-size: 24px;
    font-weight: 600;
    text-align: center;
}

/* Form Layout */
#calcForm {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

/* Form Groups */
.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

/* Labels */
.form-group label {
    color: #4b5563;
    font-size: 0.875rem;
    font-weight: 500;
}

/* Radio Button Group */
#conversionTypeDiv {
    display: flex;
    justify-content: center;
    padding: 12px;
}

.radio-group {
    display: flex;
    gap: 8px;
    background: #f3f4f6;
    border-radius: 8px;
    padding: 4px;
    width: 100%;
}

.radio-group input[type="radio"] {
    display: none;
}

.radio-group label {
    flex: 1;
    padding: 8px 16px;
    background: transparent;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s;
    font-weight: 500;
    color: #4b5563;
    text-align: center;
    white-space: nowrap;
    font-size: 0.875rem;
}

.radio-group input[type="radio"]:checked + label {
    background: #003049;
    color: white;
}

/* Input Fields */
.form-group input[type="number"] {
    padding: 10px 12px;
    border: 1px solid #d1d5db;
    border-radius: 6px;
    font-size: 16px;
    transition: all 0.2s;
    width: 100%;
}

.form-group input[type="number"]:focus {
    outline: none;
    border-color: #003049;
    box-shadow: 0 0 0 3px rgba(0, 48, 73, 0.1);
}

/* Custom Select Dropdowns */
.form-group select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%234b5563' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    background-size: 16px;
    padding: 10px 36px 10px 12px;
    border: 1px solid #d1d5db;
    border-radius: 6px;
    font-size: 16px;
    color: #1f2937;
    width: 100%;
    transition: all 0.2s;
}

.form-group select:focus {
    outline: none;
    border-color: #003049;
    box-shadow: 0 0 0 3px rgba(0, 48, 73, 0.1);
}

/* Input Groups (for fields with units) */
.input-group {
    display: flex;
    gap: 8px;
}

.input-group input[type="number"] {
    flex: 1;
}

.input-group select {
    width: 100px;
    flex-shrink: 0;
}

/* Error States */
.error {
    border-color: #dc2626 !important;
}

.error-message {
    color: #dc2626;
    font-size: 0.75rem;
    margin-top: 4px;
}

.button-group {
    display: flex;
    gap: 12px;
}

/* Action Buttons */
.submit-button,
.reset-button {
    flex: 1;
    padding: 12px 24px;
    font-size: 0.875rem;
    font-weight: 500;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s;
}

.submit-button {
    background: #003049;
    color: white;
    border: none;
}

.submit-button:hover {
    background: #002238;
}

.reset-button {
    background: white;
    color: #4b5563;
    border: 1px solid #d1d5db;
}

.reset-button:hover {
    background: #f3f4f6;
    border-color: #9ca3af;
}

/* Results Area */
#result {
    display: none;
    margin-top: 24px;
    padding-top: 24px;
    border-top: 1px solid #e5e7eb;
}

#result h2 {
    color: #1f2937;
    font-size: 1rem;
    font-weight: 500;
    margin-bottom: 12px;
}

#resultContent {
    background: #f8fafc;
    padding: 16px;
    border-radius: 6px;
    border: 1px solid #e5e7eb;
}

#resultContent p {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 0;
    color: #374151;
    font-size: 0.875rem;
    border-bottom: 1px solid #f1f5f9;
}

#resultContent p:last-child {
    border-bottom: none;
}

#resultContent p strong {
    color: #1f2937;
    font-weight: 500;
}

/* Responsive Design */
@media (max-width: 640px) {
    .header-container {
        padding: 0 1rem;
    }
    
    .logo-text {
        font-size: 1rem;
    }
    
    .beta-badge {
        font-size: 0.625rem;
        padding: 0.125rem 0.375rem;
    }
    
    .header-content {
        height: 3.5rem;
    }
    
    .calculator-wrapper {
        padding: 16px;
    }
    
    h1 {
        margin: -16px -16px 16px -16px;
        font-size: 20px;
    }
    
    .button-group {
        flex-direction: column;
    }
    
    .submit-button,
    .reset-button {
        width: 100%;
    }
}

@media (max-width: 480px) {
    .header {
        position: fixed;
    }
    
    body {
        padding-top: 3.5rem;
    }
    
    .logo-icon {
        font-size: 1.5rem;
    }

    .radio-group {
        width: 100%;
        justify-content: center;
    }
}