:root {
    --bg-primary: #0a0a0a;
    --bg-secondary: #111111;
    --bg-card: #1a1a1a;
    --accent-red: #e91e21;
    --accent-red-dark: #b8181a;
    --accent-red-light: #ff4145;
    --accent-yellow: #ffc107;
    --text-primary: #ffffff;
    --text-secondary: #b0b0b0;
    --text-muted: #666666;
    --border-color: #2a2a2a;
    --gradient-red: linear-gradient(135deg, #e91e21 0%, #ff4145 100%);
}

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

body {
    font-family: 'Barlow', sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
}

/* Fondo con textura */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        radial-gradient(ellipse at 20% 20%, rgba(233, 30, 33, 0.03) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 80%, rgba(255, 65, 69, 0.02) 0%, transparent 50%);
    pointer-events: none;
    z-index: -1;
}

/* Header */
header {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
}

.header-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.logo-section {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.logo-icon {
    width: 60px;
    height: 60px;
    object-fit: contain;
}

.logo-text {
    font-family: 'Oswald', sans-serif;
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: 2px;
}

.logo-text span {
    color: var(--accent-red);
}

.contact-info {
    display: flex;
    gap: 2rem;
    flex-wrap: wrap;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.contact-item svg {
    width: 20px;
    height: 20px;
    color: var(--accent-red);
}

.contact-item a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.3s;
}

.contact-item a:hover {
    color: var(--accent-red);
}

/* Hero Section */
.hero {
    background: var(--gradient-red);
    padding: 2rem;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url("data:image/svg+xml,%3Csvg viewBox='0 0 100 100' xmlns='http://www.w3.org/2000/svg'%3E%3Cpattern id='grid' width='10' height='10' patternUnits='userSpaceOnUse'%3E%3Cpath d='M 10 0 L 0 0 0 10' fill='none' stroke='rgba(0,0,0,0.1)' stroke-width='0.5'/%3E%3C/pattern%3E%3Crect width='100' height='100' fill='url(%23grid)'/%3E%3C/svg%3E");
    opacity: 0.3;
}

.hero h1 {
    font-family: 'Oswald', sans-serif;
    font-size: 2.5rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 3px;
    position: relative;
    z-index: 1;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

.hero p {
    font-size: 1.1rem;
    margin-top: 0.5rem;
    position: relative;
    z-index: 1;
    opacity: 0.9;
}

/* Filtros */
.filters-section {
    max-width: 1400px;
    margin: 2rem auto;
    padding: 0 2rem;
}

.filters-container {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    align-items: center;
}

.filter-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.filter-group label {
    font-size: 0.85rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.filter-group select,
.filter-group input {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.75rem 1rem;
    border-radius: 8px;
    font-family: 'Barlow', sans-serif;
    font-size: 1rem;
    min-width: 180px;
    cursor: pointer;
    transition: border-color 0.3s;
}

.filter-group select:focus,
.filter-group input:focus {
    outline: none;
    border-color: var(--accent-red);
}

.search-box {
    flex: 1;
    min-width: 250px;
}

/* Checkbox personalizado */
.checkbox-group {
    display: flex;
    align-items: center;
    justify-content: center;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    cursor: pointer;
    font-size: 0.95rem;
    color: var(--text-primary);
    text-transform: none;
    user-select: none;
}

.checkbox-label input[type="checkbox"] {
    display: none;
}

.checkbox-custom {
    width: 22px;
    height: 22px;
    border: 2px solid var(--border-color);
    border-radius: 4px;
    background: var(--bg-secondary);
    position: relative;
    transition: all 0.2s;
}

.checkbox-label input[type="checkbox"]:checked + .checkbox-custom {
    background: var(--accent-red);
    border-color: var(--accent-red);
}

.checkbox-custom::after {
    content: '';
    position: absolute;
    top: 3px;
    left: 7px;
    width: 5px;
    height: 10px;
    border: solid white;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
    opacity: 0;
    transition: opacity 0.2s;
}

.checkbox-label input[type="checkbox"]:checked + .checkbox-custom::after {
    opacity: 1;
}

.checkbox-label:hover .checkbox-custom {
    border-color: var(--accent-red);
}

.search-box input {
    width: 100%;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.75rem 1rem 0.75rem 2.5rem;
    border-radius: 8px;
    font-family: 'Barlow', sans-serif;
    font-size: 1rem;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='20' height='20' viewBox='0 0 24 24' fill='none' stroke='%23666666' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Ccircle cx='11' cy='11' r='8'%3E%3C/circle%3E%3Cline x1='21' y1='21' x2='16.65' y2='16.65'%3E%3C/line%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: 0.75rem center;
}

/* Catálogo Grid */
.catalog-section {
    max-width: 1400px;
    margin: 0 auto 3rem;
    padding: 0 2rem;
}

.catalog-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.results-count {
    color: var(--text-secondary);
    font-size: 1rem;
}

.results-count span {
    color: var(--accent-red);
    font-weight: 600;
}

.catalog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
}

/* Card de Batería */
.battery-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    overflow: hidden;
    transition: transform 0.3s, box-shadow 0.3s, border-color 0.3s;
    position: relative;
}

.battery-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 40px rgba(233, 30, 33, 0.15);
    border-color: var(--accent-red);
}

.battery-card.featured {
    border-color: var(--accent-red);
}

.battery-card.featured::before {
    content: 'DESTACADO';
    position: absolute;
    top: 1rem;
    right: -2rem;
    background: var(--gradient-red);
    color: white;
    font-family: 'Oswald', sans-serif;
    font-size: 0.75rem;
    font-weight: 600;
    padding: 0.25rem 2.5rem;
    transform: rotate(45deg);
    z-index: 10;
}

.card-image {
    background: linear-gradient(180deg, #1a1a1a 0%, #0a0a0a 100%);
    padding: 1.5rem;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 220px;
    position: relative;
}

.card-image img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    transition: transform 0.3s;
}

.battery-card:hover .card-image img {
    transform: scale(1.05);
}

.brand-badge {
    position: absolute;
    top: 1rem;
    left: 1rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.card-content {
    padding: 1.25rem;
}

.card-title {
    font-family: 'Oswald', sans-serif;
    font-size: 1.4rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.card-specs {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.spec-tag {
    background: var(--bg-secondary);
    padding: 0.35rem 0.75rem;
    border-radius: 6px;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.spec-tag.highlight {
    background: rgba(233, 30, 33, 0.15);
    color: var(--accent-red);
    border: 1px solid rgba(233, 30, 33, 0.3);
}

.spec-tag.garantia-12 {
    background: rgba(74, 222, 128, 0.15);
    color: #4ade80;
    border: 1px solid rgba(74, 222, 128, 0.3);
}

.spec-tag.garantia-6 {
    background: rgba(255, 193, 7, 0.15);
    color: #ffc107;
    border: 1px solid rgba(255, 193, 7, 0.3);
}

.spec-tag.modelo-tag {
    background: rgba(160, 160, 160, 0.15);
    color: var(--text-secondary);
    border: 1px solid rgba(160, 160, 160, 0.3);
}

.btn-specs {
    width: 100%;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.75rem 1rem;
    border-radius: 8px;
    font-family: 'Barlow', sans-serif;
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    margin-top: 0.75rem;
    transition: all 0.3s;
}

.btn-specs:hover {
    background: var(--accent-red);
    border-color: var(--accent-red);
}

.btn-specs svg {
    transition: transform 0.3s;
}

.btn-specs:hover svg {
    transform: scale(1.1);
}

/* Modal de especificaciones */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(5px);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    padding: 1rem;
}

.modal-overlay.active {
    display: flex;
}

.modal-content {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    max-width: 500px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    position: relative;
    animation: modalSlideIn 0.3s ease;
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: translateY(-20px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.modal-header {
    background: var(--gradient-red);
    padding: 1.25rem 1.5rem;
    border-radius: 16px 16px 0 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h2 {
    font-family: 'Oswald', sans-serif;
    font-size: 1.4rem;
    font-weight: 600;
    margin: 0;
}

.modal-close {
    background: rgba(255, 255, 255, 0.2);
    border: none;
    color: white;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.3s;
}

.modal-close:hover {
    background: rgba(255, 255, 255, 0.3);
}

.modal-body {
    padding: 1.5rem;
}

.specs-grid {
    display: grid;
    gap: 0.75rem;
}

.spec-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 1rem;
    background: var(--bg-secondary);
    border-radius: 8px;
    border-left: 3px solid var(--accent-red);
}

.spec-row .spec-label {
    color: var(--text-muted);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.spec-row .spec-value {
    color: var(--text-primary);
    font-weight: 600;
    font-size: 1rem;
}

.card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

.price {
    font-family: 'Oswald', sans-serif;
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--accent-red);
}

.price-currency {
    font-size: 1rem;
    color: var(--text-secondary);
}

.stock-status {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
}

.stock-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: #4ade80;
}

.stock-dot.low {
    background: var(--accent-yellow);
}

.stock-dot.out {
    background: #ef4444;
}

/* Batería sin stock */
.battery-card.out-of-stock {
    opacity: 0.8;
}

.battery-card.out-of-stock .card-image {
    filter: grayscale(100%);
}

.battery-card.out-of-stock .card-image img {
    filter: grayscale(100%);
}

.battery-card.out-of-stock:hover {
    transform: none;
    box-shadow: none;
    border-color: var(--border-color);
}

.battery-card.out-of-stock:hover .card-image img {
    transform: none;
}

.price.sin-stock-text {
    color: #ef4444;
    font-size: 1.4rem;
}

/* Garantía Banner */
.warranty-banner {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
    padding: 1.5rem 2rem;
    margin: 2rem 0;
}

.warranty-content {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    justify-content: center;
    gap: 3rem;
    flex-wrap: wrap;
}

.warranty-item {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.warranty-icon {
    width: 50px;
    height: 50px;
    background: var(--gradient-red);
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
}

.warranty-icon svg {
    width: 24px;
    height: 24px;
    color: white;
}

.warranty-text h3 {
    font-family: 'Oswald', sans-serif;
    font-size: 1.1rem;
    font-weight: 600;
}

.warranty-text p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Footer */
footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 2rem;
    text-align: center;
}

.footer-content {
    max-width: 1400px;
    margin: 0 auto;
}

.footer-logo {
    font-family: 'Oswald', sans-serif;
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.footer-logo span {
    color: var(--accent-red);
}

.footer-text {
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        text-align: center;
    }

    .contact-info {
        justify-content: center;
    }

    .hero h1 {
        font-size: 1.8rem;
    }

    .filters-container {
        flex-direction: column;
    }

    .filter-group select,
    .filter-group input {
        width: 100%;
    }

    .catalog-grid {
        grid-template-columns: 1fr;
    }

    .warranty-content {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }
}

/* Animaciones */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.battery-card {
    animation: fadeInUp 0.5s ease forwards;
}

.battery-card:nth-child(1) { animation-delay: 0.1s; }
.battery-card:nth-child(2) { animation-delay: 0.15s; }
.battery-card:nth-child(3) { animation-delay: 0.2s; }
.battery-card:nth-child(4) { animation-delay: 0.25s; }
.battery-card:nth-child(5) { animation-delay: 0.3s; }
.battery-card:nth-child(6) { animation-delay: 0.35s; }