/* CSS Custom Properties für dynamische Farben */
:root {
    --fruchtbare-farbe: #ffb3d9;
    --sehr-fruchtbare-farbe: #ffcc99;
    --eisprung-farbe: #ffddaa;
    --primary-color: #2c3e50;
    --secondary-color: #34495e;
    --text-color: #333;
    --border-color: #ddd;
    --border-radius: 8px;
    --box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

/* Container */
#eisprungrechner-container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    color: var(--text-color);
    line-height: 1.6;
}

/* Form Styling */
.eisprungrechner-form {
    background: #fff;
    border-radius: var(--border-radius);
    padding: 25px;
    margin-bottom: 30px;
    box-shadow: var(--box-shadow);
    border: 1px solid var(--border-color);
}

.eisprungrechner-form h3 {
    margin: 0 0 25px 0;
    color: var(--primary-color);
    font-size: 1.5rem;
    text-align: center;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--secondary-color);
}

/* Date Selection */
.date-selects {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.date-selects select {
    flex: 1;
    min-width: 80px;
    padding: 12px;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 16px;
    background: #fff;
    transition: border-color 0.3s ease;
}

.date-selects select:focus {
    outline: none;
    border-color: var(--primary-color);
}

/* Cycle Length Select */
#zykluslaenge {
    width: 100%;
    max-width: 200px;
    padding: 12px;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 16px;
    background: #fff;
    transition: border-color 0.3s ease;
}

#zykluslaenge:focus {
    outline: none;
    border-color: var(--primary-color);
}

/* Checkbox Styling */
.checkbox-container {
    display: flex;
    align-items: center;
    cursor: pointer;
    font-weight: normal !important;
    margin-bottom: 0 !important;
}

.checkbox-container input[type="checkbox"] {
    margin-right: 10px;
    width: 18px;
    height: 18px;
    cursor: pointer;
}

.hinweis {
    margin-top: 8px;
    font-size: 0.9rem;
    color: #666;
    font-style: italic;
}

/* Button */
#berechnen-btn {
    width: 100%;
    padding: 15px 30px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border: none;
    border-radius: var(--border-radius);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

#berechnen-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
}

#berechnen-btn:active {
    transform: translateY(0);
}

/* Calendar Container */
#kalender-container {
    background: #fff;
    border-radius: var(--border-radius);
    padding: 25px;
    box-shadow: var(--box-shadow);
    border: 1px solid var(--border-color);
}

/* Calendar Navigation */
.kalender-navigation {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 20px;
    flex-wrap: wrap;
    gap: 10px;
}

.kalender-navigation button {
    padding: 10px 15px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 14px;
    transition: background-color 0.3s ease;
}

.kalender-navigation button:hover {
    background: var(--secondary-color);
}

.kalender-navigation h4 {
    margin: 0;
    color: var(--primary-color);
    font-size: 1.2rem;
    text-align: center;
    flex: 1;
    min-width: 200px;
}

/* Calendar Grid */
#kalender-grid {
    width: 100%;
}

/* Einnistung Info */
.einnistung-info {
    background: #f8f9fa;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 15px;
    margin: 20px 0;
    font-size: 0.95rem;
}

.einnistung-info div {
    margin-bottom: 8px;
    color: var(--secondary-color);
}

.einnistung-info div:last-child {
    margin-bottom: 0;
}

#eisprung-datum-info {
    font-size: 1.1rem;
    margin-bottom: 12px !important;
    color: var(--primary-color) !important;
}

.kalender-header {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 1px;
    margin-bottom: 10px;
}

.tag-header {
    padding: 10px 5px;
    text-align: center;
    font-weight: 600;
    color: var(--secondary-color);
    background: #f8f9fa;
    border-radius: var(--border-radius);
    font-size: 0.9rem;
}

.kalender-body {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 2px;
}

.tag-zelle {
    position: relative;
    min-height: 60px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    padding: 5px;
    background: #fff;
    transition: all 0.3s ease;
}

.tag-zelle.leer {
    border: none;
    background: transparent;
}

.tag-nummer {
    font-weight: 600;
    font-size: 0.9rem;
    margin-bottom: 2px;
}

/* Calendar Event Styling */
.tag-zelle.fruchtbar {
    background-color: var(--fruchtbare-farbe);
    border-color: var(--fruchtbare-farbe);
}

.tag-zelle.sehr-fruchtbar {
    background-color: var(--sehr-fruchtbare-farbe);
    border-color: var(--sehr-fruchtbare-farbe);
}

.tag-zelle.periode .tag-nummer {
    font-weight: 800;
    color: var(--primary-color);
}

.tag-zelle.eisprung {
    background-color: var(--eisprung-farbe);
    border-color: var(--eisprung-farbe);
}

.tag-zelle.eisprung .tag-nummer {
    font-weight: 800;
    color: var(--primary-color);
}

/* Icons */
.periode-icon, .eisprung-icon {
    font-size: 12px;
    margin-top: 2px;
}

.geschlecht-icon {
    font-size: 14px;
    font-weight: bold;
    margin-top: 2px;
}

.geschlecht-icon.maedchen {
    color: #e91e63;
}

.geschlecht-icon.junge {
    color: #2196f3;
}

/* Legend */
.legende {
    margin-top: 25px;
    padding: 20px;
    background: #f8f9fa;
    border-radius: var(--border-radius);
}

.legende h5 {
    margin: 0 0 15px 0;
    color: var(--primary-color);
    font-size: 1.1rem;
}

.legende-items {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 10px;
}

.legende-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px;
    border-radius: var(--border-radius);
    background: #fff;
    border: 1px solid var(--border-color);
}

.legende-item span:first-child {
    font-size: 16px;
    min-width: 20px;
    text-align: center;
}

.fruchtbare-color, .sehr-fruchtbare-color, .eisprung-color {
    width: 20px;
    height: 20px;
    border-radius: 3px;
    border: 1px solid var(--border-color);
}

.fruchtbare-color {
    background-color: var(--fruchtbare-farbe);
}

.sehr-fruchtbare-color {
    background-color: var(--sehr-fruchtbare-farbe);
}

.eisprung-color {
    background-color: var(--eisprung-farbe);
}

/* Mobile Optimizations */
@media (max-width: 768px) {
    #eisprungrechner-container {
        padding: 15px;
    }
    
    .eisprungrechner-form, #kalender-container {
        padding: 20px;
    }
    
    .date-selects {
        flex-direction: column;
    }
    
    .date-selects select {
        width: 100%;
        margin-bottom: 10px;
    }
    
    .kalender-navigation {
        flex-direction: column;
        text-align: center;
    }
    
    .kalender-navigation h4 {
        order: -1;
        margin-bottom: 15px;
    }
    
    .tag-zelle {
        min-height: 50px;
        font-size: 0.9rem;
    }
    
    .tag-nummer {
        font-size: 0.8rem;
    }
    
    .periode-icon, .eisprung-icon {
        font-size: 10px;
    }
    
    .geschlecht-icon {
        font-size: 12px;
    }
    
    .legende-items {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .kalender-navigation button {
        padding: 8px 12px;
        font-size: 12px;
    }
    
    .tag-header {
        padding: 8px 3px;
        font-size: 0.8rem;
    }
    
    .tag-zelle {
        min-height: 45px;
        padding: 3px;
    }
    
    .tag-nummer {
        font-size: 0.75rem;
    }
}

/* Print Styles */
@media print {
    #eisprungrechner-container {
        box-shadow: none;
        border: none;
    }
    
    .eisprungrechner-form {
        display: none;
    }
    
    .kalender-navigation button {
        display: none;
    }
}