:root {
    --bg-dark: #0f172a;
    --card-bg: #1e293b;
    --accent-blue: #00f0ff;
    --primary-blue: #2563eb;
    --text-light: #f8fafc;
    --text-muted: #94a3b8;
    --border-color: #334155;
    --red: #ef4444;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

body {
    background-color: var(--bg-dark);
    color: var(--text-light);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Navbar */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.8rem 2rem;
    background: #090d16;
    border-bottom: 1px solid var(--border-color);
}

.brand {
    display: flex;
    align-items: center;
    gap: 12px;
}

.brand-logo {
    max-height: 40px;
    object-fit: contain;
}

.brand-name {
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: 1px;
}

.brand-name span {
    color: var(--accent-blue);
}

.navbar-right {
    display: flex;
    align-items: center;
    gap: 20px;
}

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

/* Botón flotante de carrito en navbar */
.cart-toggle-btn {
    position: relative;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    color: var(--text-light);
    font-size: 1.2rem;
    padding: 8px 14px;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.cart-toggle-btn:hover {
    border-color: var(--accent-blue);
    transform: translateY(-2px);
    box-shadow: 0 0 10px rgba(0, 240, 255, 0.3);
}

.cart-badge {
    position: absolute;
    top: -6px;
    right: -6px;
    background: var(--red);
    color: #fff;
    font-size: 0.72rem;
    font-weight: 900;
    min-width: 20px;
    height: 20px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 2px solid var(--bg-dark);
}

/* Layout Principal */
.main-layout {
    display: flex;
    flex: 1;
    overflow: hidden;
}

@media (max-width: 900px) {
    .main-layout {
        flex-direction: column;
        overflow-y: auto;
    }
}

/* Panel Izquierdo */
.viewer-section {
    flex: 1.2;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 1.5rem;
    background: radial-gradient(circle at center, #1e293b 0%, #0b0f17 100%);
    position: relative;
}

/* Pestañas 3D */
.view-mode-tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 15px;
}

.tab-btn {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    color: var(--text-muted);
    padding: 8px 18px;
    border-radius: 999px;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s ease;
}

.tab-btn.active, .tab-btn:hover {
    background: var(--primary-blue);
    border-color: var(--accent-blue);
    color: #fff;
    box-shadow: 0 0 12px rgba(0, 240, 255, 0.4);
}

.canvas-container {
    width: 420px;
    height: 480px;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.02);
    border-radius: 16px;
    border: 1px solid var(--border-color);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    overflow: hidden;
}

.viewer-3d-canvas {
    width: 100%;
    height: 100%;
    position: absolute;
    inset: 0;
}

.viewer-loading {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: var(--accent-blue);
    font-size: 0.9rem;
    font-weight: 700;
}

.user-photo-layer {
    width: 100%;
    height: 100%;
    object-fit: cover;
    position: absolute;
    top: 0;
    left: 0;
    z-index: 10;
}

.ai-loader {
    position: absolute;
    inset: 0;
    background: rgba(15, 23, 42, 0.85);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 20;
}

.spinner {
    width: 42px;
    height: 42px;
    border: 4px solid rgba(0, 240, 255, 0.2);
    border-top-color: var(--accent-blue);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 12px;
}

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

.viewer-actions {
    margin-top: 1.5rem;
    display: flex;
    gap: 12px;
}

/* Panel Derecho */
.controls-section {
    flex: 1;
    background: #111827;
    border-left: 1px solid var(--border-color);
    padding: 2rem;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    gap: 1.2rem;
}

.section-block h3 {
    font-size: 0.95rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--accent-blue);
    margin-bottom: 0.8rem;
}

/* Paleta de Colores Agrupados */
.color-groups-container {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.color-group-label {
    font-size: 0.72rem;
    color: var(--text-muted);
    text-transform: uppercase;
    font-weight: 700;
    margin-top: 4px;
}

.color-palette {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.color-dot {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    border: 2px solid transparent;
    cursor: pointer;
    box-shadow: 0 0 0 1px var(--border-color);
    transition: transform 0.2s, border-color 0.2s;
}

.color-dot:hover {
    transform: scale(1.15);
}

.color-dot.active {
    border-color: var(--accent-blue);
    box-shadow: 0 0 10px var(--accent-blue);
    transform: scale(1.1);
}

/* Cuadrícula de Diseños */
.design-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
    gap: 10px;
    max-height: 220px;
    overflow-y: auto;
    padding-right: 4px;
}

.design-card {
    background: var(--card-bg);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    padding: 6px;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    transition: all 0.2s ease;
}

.design-card:hover {
    border-color: var(--accent-blue);
    transform: translateY(-2px);
}

.design-card.active {
    border-color: var(--accent-blue);
    background: #1e3a5f;
    box-shadow: 0 0 12px rgba(0, 240, 255, 0.3);
}

.design-card img {
    width: 100%;
    aspect-ratio: 1;
    object-fit: contain;
}

.design-card span {
    font-size: 0.65rem;
    margin-top: 4px;
    text-align: center;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    width: 100%;
    color: var(--text-muted);
}

/* Selector de Tallas (Size) */
.size-selector {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.size-btn {
    min-width: 48px;
    padding: 9px 14px;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    color: var(--text-light);
    border-radius: 8px;
    font-weight: 800;
    cursor: pointer;
    transition: all 0.2s ease;
}

.size-btn:hover {
    border-color: var(--accent-blue);
    transform: translateY(-2px);
}

.size-btn.active {
    background: var(--primary-blue);
    border-color: var(--accent-blue);
    color: #fff;
    box-shadow: 0 0 10px rgba(0, 240, 255, 0.4);
}

/* Botones */
.btn-primary {
    background: var(--primary-blue);
    color: white;
    border: none;
    padding: 0.9rem;
    border-radius: 8px;
    font-weight: bold;
    font-size: 1rem;
    cursor: pointer;
    width: 100%;
    transition: background 0.2s;
}

.btn-primary:hover {
    background: #1d4ed8;
    box-shadow: 0 0 15px rgba(37, 99, 235, 0.4);
}

.btn-secondary {
    background: #1e293b;
    border: 1px solid var(--border-color);
    color: white;
    padding: 0.6rem 1rem;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.85rem;
}

.btn-secondary:hover {
    border-color: var(--accent-blue);
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-muted);
    padding: 0.6rem 1rem;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.85rem;
}

/* Resumen y Botón de Carrito Pegados Arriba */
.order-summary {
    margin-top: 0.5rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

.price-tag {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.8rem;
    font-size: 1.1rem;
}

.price-tag strong {
    color: var(--accent-blue);
    font-size: 1.4rem;
}

.btn-generate-ai {
    background: linear-gradient(135deg, #00f0ff 0%, #2563eb 100%);
    color: #0f172a;
    font-weight: 800;
    font-size: 0.95rem;
    padding: 0.85rem 1.2rem;
    border: none;
    border-radius: 8px;
    width: 100%;
    cursor: pointer;
    box-shadow: 0 0 15px rgba(0, 240, 255, 0.4);
    transition: transform 0.2s, box-shadow 0.2s;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.btn-generate-ai:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 25px rgba(0, 240, 255, 0.7);
}

/* =========================================================
   CARRITO FLOTANTE (SLIDE-IN DRAWER)
========================================================= */
.cart-drawer-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.65);
    z-index: 3000;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.cart-drawer-overlay.active {
    opacity: 1;
    visibility: visible;
}

.cart-drawer {
    position: fixed;
    top: 0;
    right: 0;
    width: min(400px, 100%);
    height: 100vh;
    background: #090d16;
    border-left: 1px solid var(--border-color);
    box-shadow: -10px 0 30px rgba(0, 0, 0, 0.5);
    z-index: 3500;
    display: flex;
    flex-direction: column;
    transform: translateX(100%);
    transition: transform 0.3s ease;
}

.cart-drawer.active {
    transform: translateX(0);
}

.cart-drawer-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.cart-drawer-header h3 {
    font-size: 1.2rem;
    color: var(--accent-blue);
}

.btn-close-cart {
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 1.3rem;
    cursor: pointer;
}

.btn-close-cart:hover {
    color: var(--red);
}

.cart-drawer-items {
    flex: 1;
    padding: 1.5rem;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.cart-empty-text {
    text-align: center;
    color: var(--text-muted);
    margin-top: 40px;
}

.cart-item-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 12px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.cart-item-info strong {
    display: block;
    font-size: 0.95rem;
    color: #fff;
}

.cart-item-info span {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.cart-item-actions {
    display: flex;
    align-items: center;
    gap: 10px;
}

.cart-item-price {
    color: var(--accent-blue);
    font-weight: 800;
}

.btn-remove-item {
    background: transparent;
    border: none;
    color: var(--red);
    cursor: pointer;
    font-size: 1.1rem;
}

.cart-drawer-footer {
    padding: 1.5rem;
    border-top: 1px solid var(--border-color);
    background: #0f172a;
}

.cart-total-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.2rem;
    font-size: 1.15rem;
}

.cart-total-row strong {
    color: var(--accent-blue);
    font-size: 1.35rem;
}

/* Botón de WhatsApp dentro del Carrito */
.btn-whatsapp-checkout {
    width: 100%;
    padding: 14px;
    border: none;
    border-radius: 8px;
    background: #22c55e;
    color: #fff;
    font-weight: 900;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: 0 0 15px rgba(34, 197, 94, 0.4);
}

.btn-whatsapp-checkout:hover {
    background: #16a34a;
    transform: translateY(-2px);
    box-shadow: 0 0 25px rgba(34, 197, 94, 0.6);
}