/**
 * LUKO Calculators - Frontend Styles
 * Professional, responsive design optimized for German market
 */

/* ===========================
   Container & Layout
   =========================== */

.luko-calculator-container {
    max-width: 800px;
    margin: 40px auto;
    padding: 0;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    color: #333;
    background: #ffffff;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    overflow: hidden;
}

.luko-calc-title {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    margin: 0;
    padding: 30px;
    font-size: 28px;
    font-weight: 700;
    text-align: center;
}

.luko-calc-description {
    padding: 20px 30px;
    margin: 0;
    font-size: 16px;
    line-height: 1.6;
    color: #666;
    text-align: center;
    border-bottom: 1px solid #e0e0e0;
}

/* ===========================
   Inputs Section
   =========================== */

.luko-calc-inputs {
    padding: 30px;
}

.luko-calc-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.luko-calc-field {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.field-label {
    font-weight: 600;
    font-size: 14px;
    color: #333;
    display: flex;
    align-items: center;
    gap: 8px;
}

.field-label .required {
    color: #e74c3c;
    font-weight: bold;
}

.field-label .tooltip {
    cursor: help;
    font-size: 16px;
}

.field-input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

input[type="number"],
input[type="text"],
input[type="email"],
select {
    width: 100%;
    padding: 14px 16px;
    font-size: 16px;
    line-height: 1.5;
    min-height: 48px; /* Better touch target for mobile */
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    transition: all 0.3s ease;
    font-family: inherit;
    -webkit-appearance: none;
    -moz-appearance: textfield; /* Remove default arrows in Firefox */
}

/* Custom number input styling for better visibility */
input[type="number"]::-webkit-outer-spin-button,
input[type="number"]::-webkit-inner-spin-button {
    opacity: 1;
    height: 46px;
    margin-left: 10px;
}

input[type="number"]:focus,
input[type="text"]:focus,
input[type="email"]:focus,
select:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.field-unit {
    position: absolute;
    right: 16px;
    color: #999;
    font-weight: 600;
    pointer-events: none;
}

/* Slider Styles */
.field-slider-wrapper {
    display: flex;
    align-items: center;
    gap: 15px;
}

input[type="range"] {
    flex: 1;
    height: 6px;
    -webkit-appearance: none;
    appearance: none;
    background: linear-gradient(to right, #667eea 0%, #764ba2 100%);
    border-radius: 3px;
    outline: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    background: white;
    border: 3px solid #667eea;
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

input[type="range"]::-moz-range-thumb {
    width: 20px;
    height: 20px;
    background: white;
    border: 3px solid #667eea;
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.slider-value {
    min-width: 80px;
    padding: 8px 12px;
    background: #f5f5f5;
    border-radius: 6px;
    font-weight: 600;
    text-align: center;
    color: #667eea;
}

.field-help-text {
    font-size: 13px;
    color: #999;
    line-height: 1.4;
}

.field-error {
    font-size: 13px;
    color: #e74c3c;
    padding: 8px;
    background: #ffebee;
    border-radius: 4px;
}

.form-error {
    padding: 15px;
    background: #ffebee;
    color: #c62828;
    border-radius: 8px;
    border-left: 4px solid #e74c3c;
    margin-bottom: 20px;
}

/* ===========================
   Submit Button
   =========================== */

.luko-calc-submit {
    margin-top: 10px;
}

.luko-calc-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 16px 32px;
    min-height: 52px; /* Better touch target for mobile */
    font-size: 17px;
    font-weight: 600;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-family: inherit;
    text-decoration: none;
}

.luko-calc-btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    width: 100%;
}

.luko-calc-btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(102, 126, 234, 0.3);
}

.luko-calc-btn-primary:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.luko-calc-btn-secondary {
    background: white;
    color: #667eea;
    border: 2px solid #667eea;
}

.luko-calc-btn-secondary:hover {
    background: #667eea;
    color: white;
}

.luko-calc-btn-link {
    background: transparent;
    color: #667eea;
    padding: 8px 16px;
}

.luko-calc-btn-link:hover {
    text-decoration: underline;
}

.spinner {
    display: inline-block;
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ===========================
   Results Section
   =========================== */

.luko-calc-results {
    padding: 30px;
    background: #fafafa;
}

.results-title {
    margin: 0 0 20px 0;
    font-size: 24px;
    font-weight: 700;
    color: #333;
}

.results-outputs {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 15px;
    margin-bottom: 25px;
}

.result-item {
    background: white;
    padding: 20px;
    border-radius: 10px;
    border-left: 4px solid #667eea;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.result-label {
    font-size: 13px;
    color: #666;
    font-weight: 600;
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.result-value {
    font-size: 28px;
    font-weight: 700;
    color: #667eea;
}

/* ===========================
   Warnings
   =========================== */

.results-warnings {
    margin: 20px 0;
}

.warning {
    padding: 16px;
    border-radius: 8px;
    margin-bottom: 12px;
    border-left: 4px solid;
}

.warning.info {
    background: #e3f2fd;
    border-left-color: #2196f3;
}

.warning.warning {
    background: #fff3e0;
    border-left-color: #ff9800;
}

.warning.error {
    background: #ffebee;
    border-left-color: #f44336;
}

.warning-header {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 8px;
    font-weight: 700;
}

.warning-icon {
    font-size: 20px;
}

.warning-message {
    margin-bottom: 8px;
    line-height: 1.5;
}

.warning-recommendation {
    margin-top: 10px;
    padding-top: 10px;
    border-top: 1px solid rgba(0, 0, 0, 0.1);
    font-size: 14px;
}

/* ===========================
   Action Buttons
   =========================== */

.luko-calc-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 25px;
}

.luko-calc-actions .luko-calc-btn {
    flex: 1;
    min-width: 200px;
}

/* ===========================
   Email Modal
   =========================== */

.luko-calc-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
}

.modal-content {
    background: white;
    padding: 40px;
    border-radius: 12px;
    max-width: 500px;
    width: 90%;
    position: relative;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
}

.modal-close {
    position: absolute;
    top: 15px;
    right: 15px;
    font-size: 30px;
    line-height: 1;
    cursor: pointer;
    color: #999;
    transition: color 0.3s;
}

.modal-close:hover {
    color: #333;
}

.modal-content h3 {
    margin: 0 0 20px 0;
    font-size: 24px;
    color: #333;
}

.email-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.email-form .form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.email-form label {
    font-weight: 600;
    font-size: 14px;
}

.email-form input[type="checkbox"] {
    width: auto;
    margin-right: 8px;
}

/* ===========================
   Theme Variations
   =========================== */

.luko-calculator-container.theme-minimal .luko-calc-title {
    background: #333;
}

.luko-calculator-container.theme-professional .luko-calc-title {
    background: linear-gradient(135deg, #1e3c72 0%, #2a5298 100%);
}

/* ===========================
   Responsive Design
   =========================== */

@media (max-width: 768px) {
    .luko-calculator-container {
        margin: 20px 10px;
        border-radius: 8px;
    }

    .luko-calc-title {
        font-size: 22px;
        padding: 20px;
    }

    .luko-calc-inputs,
    .luko-calc-results {
        padding: 20px;
    }

    .results-outputs {
        grid-template-columns: 1fr;
    }

    .luko-calc-actions {
        flex-direction: column;
    }

    .luko-calc-actions .luko-calc-btn {
        width: 100%;
        min-width: auto;
    }

    .modal-content {
        padding: 25px;
        width: 95%;
    }

    .result-value {
        font-size: 24px;
    }
}

@media (max-width: 480px) {
    .luko-calc-title {
        font-size: 20px;
    }

    .field-slider-wrapper {
        flex-direction: column;
        align-items: stretch;
    }

    .slider-value {
        text-align: center;
    }
}

/* ===========================
   Print Styles
   =========================== */

@media print {
    .luko-calc-inputs,
    .luko-calc-actions {
        display: none;
    }

    .luko-calc-results {
        background: white;
    }

    .luko-calculator-container {
        box-shadow: none;
        border: 1px solid #ddd;
    }
}