/* Common styles for all pages */
:root {
    /* === Backgrounds === */
    --bg:        #f6f2ea;   /* page background — warm cream */
    --surface:   #fffaf2;   /* cards, panels, inputs */
    --surface-2: #f1e7db;   /* buttons, chips, secondary fills */

    /* === Text === */
    --text-primary:   #4b4a47;   /* primary */
    --text-secondary: #6a6259;   /* labels, hints */
    --text-muted:     #c0b5ac;   /* inactive / placeholder */

    /* === Borders === */
    --border-color:        rgba(190, 180, 170, 0.6);  /* default */
    --border-color-strong: #cfc3b6;                   /* buttons, emphasis */

    /* === Accent (dusty blue) === */
    --primary-color:   #5a7896;
    --primary-dark:    #49627c;
    --primary-darker:  #384d60;
    --accent-ring:     rgba(90, 120, 150, 0.2);

    /* === Semantic === */
    --success-color: #5a8a70;   /* muted sage */
    --warning-color: #b88040;   /* warm amber */
    --error-color:   #a85858;   /* muted terracotta */
    --danger-color:  #7a4040;

    /* === Legacy alias === */
    --background-light: #f1e7db;

    /* === Shadows === */
    --shadow-color:        rgba(120, 110, 100, 0.14);
    --shadow-color-strong: rgba(120, 110, 100, 0.22);

    /* Footer */
    --footer-bg: #3a3830;
    --footer-height: 40px;
    
    /* Typography */
    --font-primary: 'Roboto Condensed', sans-serif;
    --font-secondary: 'Roboto', sans-serif;
    
    /* Spacing */
    --spacing-xs: 8px;
    --spacing-sm: 12px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    
    /* Container */
    --container-width: 700px;
    --container-padding: 32px 8px 16px;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* Reset and base styles */
* {
    box-sizing: border-box;
}

html,
body {
    width: 100%;
    height: 100%;
    margin: 0;
    padding: 0 0 var(--footer-height) 0;
    font-family: var(--font-primary);
    line-height: 1.5;
    background: var(--bg);
    color: var(--text-primary);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    margin: 0 0 var(--spacing-md) 0;
}

/* Container */
.main-container {
    position: relative;
    width: var(--container-width);
    margin: auto;
    padding: var(--container-padding);
}

/* Buttons */
.btn {
    padding: var(--spacing-md) var(--spacing-lg);
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 18px;
    font-weight: 500;
    font-family: var(--font-secondary);
    cursor: pointer;
    transition: all var(--transition-normal);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    text-decoration: none;
    display: inline-block;
    text-align: center;
}

.btn:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

.btn:active {
    background-color: var(--primary-darker);
    transform: translateY(0);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

/* Form elements */
.field {
    display: flex;
    flex-direction: column;
    margin-bottom: var(--spacing-md);
}

.field label {
    font-size: 16px;
    margin-bottom: var(--spacing-xs);
    font-family: var(--font-secondary);
    color: var(--text-primary);
}

.field input[type="number"] {
    font-size: 24px;
    padding: var(--spacing-xs) var(--spacing-sm);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    width: 100%;
    transition: border-color var(--transition-normal);
}

.field input[type="number"]:focus {
    outline: none;
    border-color: var(--primary-color);
}

/* Radio groups */
.radio-group {
    margin-bottom: var(--spacing-xl);
}

.radio-group-name {
    font-size: 20px;
    margin-bottom: var(--spacing-md);
    font-family: var(--font-secondary);
    color: var(--text-primary);
}

.radio-group-values {
    display: flex;
    justify-content: space-between;
}

.radio-group-value {
    display: flex;
    flex-direction: column;
    cursor: pointer;
    color: var(--text-muted);
    transition: color var(--transition-normal);
}

.radio-group-value input {
    display: none;
}

.radio-group-value span {
    font-size: 30px;
    user-select: none;
}

.radio-group-value input:checked + span {
    color: var(--text-primary);
}

/* Results */
.result {
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 80px;
    color: var(--success-color);
    margin: var(--spacing-md) 0;
    transition: color var(--transition-normal);
}

/* Error messages */
.error-message {
    font-size: 15px;
    color: var(--error-color);
    margin-bottom: var(--spacing-md);
    font-family: var(--font-secondary);
    line-height: 18px;
    min-height: 18px;
    text-align: center;
}

/* Responsive design */
@media (max-width: 750px) {
    .main-container {
        width: 100%;
        padding: var(--spacing-md);
    }
    
    .radio-group-values {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .result {
        font-size: 60px;
    }
}

/* Footer */
.footer {
    position: fixed;
    left: 0;
    bottom: 0;
    width: 100%;
    height: var(--footer-height);
    background: var(--footer-bg);
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-md);
}

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