:root {
    --orange-primary: #FF5722;
    --orange-dark: #FF6F00;
    --orange-light: #FFF3E0;
    --dark-gray: #212121;
    --gray-bg: #F5F5F5;
    --white: #FFFFFF;
    --radius: 14px;
    --shadow: 0 4px 15px rgba(0,0,0,0.08);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', sans-serif;
}

body {
    background-color: #ECEFF1;
    display: flex;
    justify-content: center;
}

/* App Container (Simula un tel¨¦fono en desktop, abarca todo en m¨®vil) */
#app-container {
    width: 100%;
    max-width: 480px;
    height: 100vh;
    background-color: var(--gray-bg);
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    box-shadow: 0 0 30px rgba(0,0,0,0.1);
}

/* Typography & Utils */
.text-orange { color: var(--orange-primary); }
.hidden { display: none !important; }
.empty-msg { text-align: center; color: #888; margin-top: 2rem; }

/* Header */
header {
    background: var(--white);
    padding: 1.5rem 1rem;
    display: flex;
    align-items: center;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    z-index: 10;
}
header h1 {
    font-size: 1.2rem;
    color: var(--dark-gray);
    flex-grow: 1;
    text-align: center;
}
#btn-back {
    background: none;
    border: none;
    font-size: 1.2rem;
    color: var(--orange-primary);
    cursor: pointer;
    padding: 0.5rem;
}

/* Main Content Area */
main {
    flex-grow: 1;
    overflow-y: auto;
    position: relative;
    padding-bottom: 80px; /* Espacio para el bot¨®n flotante */
}

/* Views (SPA Transition) */
.view {
    display: none;
    padding: 1rem;
    animation: fadeIn 0.3s ease;
}
.view.active {
    display: block;
}
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Categorias Grid (Vertical Scroll en main) */
.grid-categorias {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
}
.card-categoria {
    background: var(--white);
    border-radius: var(--radius);
    padding: 1.5rem;
    text-align: center;
    box-shadow: var(--shadow);
    cursor: pointer;
    transition: transform 0.2s;
}
.card-categoria:active { transform: scale(0.95); }
.card-categoria i {
    font-size: 2.5rem;
    color: var(--orange-primary);
    margin-bottom: 0.8rem;
}
.card-categoria h3 {
    font-size: 1rem;
    color: var(--dark-gray);
}

/* Negocios List (Vertical Scroll) */
.list-negocios {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}
.card-negocio {
    background: var(--white);
    border-radius: var(--radius);
    padding: 1.2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow);
    cursor: pointer;
}
.negocio-info h3 { color: var(--dark-gray); font-size: 1.1rem; margin-bottom: 0.3rem;}
.negocio-info p { color: #666; font-size: 0.85rem; }

/* Productos Carousel (Horizontal Scroll) */
.section-title {
    margin: 1rem 0;
    color: var(--dark-gray);
}
.carousel-productos {
    display: flex;
    gap: 1rem;
    overflow-x: auto;
    padding-bottom: 1rem;
    scroll-snap-type: x mandatory;
}
.carousel-productos::-webkit-scrollbar { display: none; } /* Ocultar scrollbar */
.card-producto {
    min-width: 240px;
    background: var(--white);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    scroll-snap-align: start;
    display: flex;
    flex-direction: column;
}
.prod-img-placeholder {
    height: 120px;
    background: var(--orange-light);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--orange-primary);
    font-size: 2rem;
}
.prod-body { padding: 1rem; flex-grow: 1; display: flex; flex-direction: column;}
.prod-body h4 { color: var(--dark-gray); margin-bottom: 0.4rem; }
.prod-desc { font-size: 0.8rem; color: #777; margin-bottom: 1rem; flex-grow: 1;}
.prod-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.prod-precio { font-weight: bold; color: var(--orange-dark); font-size: 1.1rem;}
.prod-controls {
    display: flex;
    align-items: center;
    background: var(--orange-light);
    border-radius: 20px;
    padding: 0.3rem;
}
.prod-controls button {
    background: var(--orange-primary);
    color: var(--white);
    border: none;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
}
.prod-controls span { margin: 0 10px; font-weight: 600; font-size: 0.9rem;}

/* Cart Floating Button */
#btn-cart {
    position: absolute;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    width: 90%;
    background: var(--orange-primary);
    color: var(--white);
    border: none;
    border-radius: 30px;
    padding: 1rem 1.5rem;
    font-size: 1.1rem;
    font-weight: bold;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 5px 20px rgba(255,87,34,0.4);
    cursor: pointer;
    z-index: 20;
}
.cart-info { display: flex; align-items: center; gap: 10px; }

/* Modal Checkout */
.modal {
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0,0,0,0.5);
    z-index: 30;
    display: flex;
    align-items: flex-end;
    opacity: 0; pointer-events: none;
    transition: opacity 0.3s;
}
.modal.active { opacity: 1; pointer-events: auto; }
.modal-content {
    background: var(--white);
    width: 100%;
    border-radius: 24px 24px 0 0;
    padding: 1.5rem;
    transform: translateY(100%);
    transition: transform 0.3s;
    max-height: 80%;
    display: flex;
    flex-direction: column;
}
.modal.active .modal-content { transform: translateY(0); }
.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}
.modal-header h2 { color: var(--dark-gray); }
#btn-close-modal {
    background: #EEE; border: none; border-radius: 50%; width: 32px; height: 32px;
    cursor: pointer; color: #555;
}
.modal-body {
    overflow-y: auto;
    margin-bottom: 1.5rem;
}
#cart-items-list { list-style: none; margin-bottom: 1rem; }
#cart-items-list li {
    display: flex; justify-content: space-between;
    padding: 0.8rem 0; border-bottom: 1px solid #EEE;
    font-size: 0.95rem; color: var(--dark-gray);
}
.cart-summary .summary-row {
    display: flex; justify-content: space-between;
    padding: 0.5rem 0; color: #555;
}
.cart-summary .total {
    font-weight: bold; font-size: 1.2rem; color: var(--dark-gray);
    border-top: 2px solid #EEE; padding-top: 1rem; margin-top: 0.5rem;
}
.btn-primary {
    width: 100%;
    background: var(--orange-primary);
    color: var(--white);
    border: none;
    padding: 1.2rem;
    border-radius: var(--radius);
    font-size: 1.1rem;
    font-weight: bold;
    cursor: pointer;
}
.btn-primary:disabled { background: #CCC; }