:root {
    /* Colors from Volt-Gas Logo */
    --primary-blue: #344669;
    --primary-blue-light: #445982;
    --primary-orange: #f59e0b;
    --primary-orange-light: #fbbf24;
    
    --bg-color: #f4f6f9;
    --card-bg: #ffffff;
    --text-main: #1f2937;
    --text-muted: #6b7280;
    --border-color: #e5e7eb;
    
    /* Variables */
    --border-radius: 12px;
    --border-radius-sm: 8px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px rgba(0,0,0,0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Outfit', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
.header {
    background-color: var(--card-bg);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 50;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 80px;
}

.logo-placeholder h2 {
    color: var(--primary-blue);
    font-weight: 700;
    font-size: 1.5rem;
    display: flex;
    flex-direction: column;
    line-height: 1;
}

.logo-placeholder span {
    color: var(--primary-orange);
    font-size: 0.75rem;
    letter-spacing: 2px;
    text-transform: uppercase;
    margin-top: 4px;
}

.contact-info {
    display: flex;
    gap: 15px;
}

.contact-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    border-radius: var(--border-radius-sm);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    transition: var(--transition);
}

.contact-btn.whatsapp {
    background-color: #25D366;
    color: white;
}

.contact-btn.whatsapp:hover {
    background-color: #1ebc5a;
    transform: translateY(-2px);
}

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

.contact-btn.email:hover {
    background-color: var(--primary-blue-light);
    transform: translateY(-2px);
}

/* Hero Section */
.hero-section {
    padding: 60px 0;
    text-align: center;
}

.hero-title {
    font-size: 2.5rem;
    color: var(--primary-blue);
    margin-bottom: 15px;
}

.hero-subtitle {
    font-size: 1.1rem;
    color: var(--text-muted);
    max-width: 600px;
    margin: 0 auto 40px;
}

/* Calculator Card */
.calculator-card {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    max-width: 800px;
    margin: 0 auto;
    overflow: hidden;
}

/* Tabs */
.tabs {
    display: flex;
    background-color: #f8fafc;
    border-bottom: 1px solid var(--border-color);
}

.tab-btn {
    flex: 1;
    padding: 20px;
    border: none;
    background: transparent;
    font-family: inherit;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-muted);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

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

.tab-btn.active {
    background-color: var(--card-bg);
    color: var(--primary-blue);
    border-bottom: 3px solid var(--primary-orange);
}

.tab-btn i {
    font-size: 1.3rem;
}

/* Form Styles */
.tarif-form {
    padding: 30px 40px;
}

.form-row {
    margin-bottom: 25px;
}

.form-row.input-group {
    display: flex;
    gap: 20px;
}

/* Radio Cards */
.type-selection {
    display: flex;
    gap: 20px;
}

.radio-card {
    flex: 1;
    cursor: pointer;
}

.radio-card input {
    display: none;
}

.radio-content {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 15px;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    font-weight: 500;
    color: var(--text-muted);
    transition: var(--transition);
}

.radio-card input:checked + .radio-content {
    border-color: var(--primary-blue);
    background-color: rgba(52, 70, 105, 0.05);
    color: var(--primary-blue);
}

.radio-card:hover .radio-content {
    border-color: var(--primary-blue-light);
}

/* Inputs */
.input-field {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 8px;
    text-align: left;
}

.input-field label {
    font-weight: 500;
    color: var(--text-main);
    font-size: 0.95rem;
}

.input-field input {
    padding: 12px 16px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    font-family: inherit;
    font-size: 1rem;
    transition: var(--transition);
}

.input-field input:focus {
    outline: none;
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 3px rgba(52, 70, 105, 0.1);
}

.house-number {
    flex: 0.3;
}

/* Consumption Presets */
.consumption-presets {
    display: flex;
    gap: 10px;
    margin-top: 10px;
    flex-wrap: wrap;
}

.preset-btn {
    padding: 6px 12px;
    background: #f1f5f9;
    border: 1px solid var(--border-color);
    border-radius: 20px;
    font-size: 0.85rem;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 5px;
    color: var(--text-muted);
}

.preset-btn:hover {
    background: var(--primary-blue);
    color: white;
    border-color: var(--primary-blue);
}

/* Submit Button */
.btn-primary {
    width: 100%;
    padding: 18px;
    background-color: var(--primary-orange);
    color: white;
    border: none;
    border-radius: var(--border-radius-sm);
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    font-family: inherit;
}

.btn-primary:hover {
    background-color: var(--primary-orange-light);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* Results & Loader */
.hidden {
    display: none !important;
}

.loader-container {
    padding: 40px;
    text-align: center;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid rgba(52, 70, 105, 0.2);
    border-left-color: var(--primary-blue);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 15px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.results-container {
    margin-top: 40px;
    text-align: left;
}

.results-container h2 {
    color: var(--primary-blue);
    margin-bottom: 20px;
}

.results-grid {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.rate-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 20px 25px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--transition);
}

.rate-card:hover {
    border-color: var(--primary-blue);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.rate-provider {
    display: flex;
    align-items: center;
    gap: 15px;
}

.provider-icon {
    width: 50px;
    height: 50px;
    background: #e2e8f0;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    font-size: 1.5rem;
}

.rate-info h3 {
    color: var(--primary-blue);
    margin-bottom: 4px;
}

.rate-details {
    color: var(--text-muted);
    font-size: 0.9rem;
    display: flex;
    gap: 15px;
}

.rate-price {
    text-align: right;
}

.price-total {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--primary-blue);
    line-height: 1.2;
}

.price-sub {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.btn-switch {
    background: var(--primary-blue);
    color: white;
    padding: 10px 20px;
    border-radius: var(--border-radius-sm);
    text-decoration: none;
    font-weight: 500;
    display: inline-block;
    margin-top: 10px;
    transition: var(--transition);
}

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

/* Footer */
.footer {
    background: white;
    padding: 20px 0;
    text-align: center;
    color: var(--text-muted);
    margin-top: 60px;
    border-top: 1px solid var(--border-color);
}

/* Responsive */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        height: auto;
        padding: 15px 0;
        gap: 15px;
    }
    
    .form-row.input-group {
        flex-direction: column;
        gap: 15px;
    }
    
    .rate-card {
        flex-direction: column;
        align-items: flex-start;
        gap: 20px;
    }
    
    .rate-price {
        text-align: left;
        width: 100%;
        display: flex;
        justify-content: space-between;
        align-items: flex-end;
    }
}