:root {
    --color-primary:       #2563eb;
    --color-primary-dark:  #1d4ed8;
    --color-primary-light: #eff6ff;
    --color-secondary:     #64748b;
    --color-success:       #16a34a;
    --color-warning:       #d97706;
    --color-danger:        #dc2626;
    --color-dark:          #1e293b;
    --color-light:         #f8fafc;
    --color-border:        #e2e8f0;
    --color-text:          #1e293b;
    --color-text-muted:    #64748b;
    --color-bg:            #f8fafc;
    --color-white:         #ffffff;
    --font-family:         'Inter', system-ui, -apple-system, sans-serif;
    --radius-sm:           4px;
    --radius-md:           8px;
    --radius-lg:           12px;
    --radius-xl:           16px;
    --shadow-sm:           0 1px 3px rgba(0,0,0,.08);
    --shadow-md:           0 4px 12px rgba(0,0,0,.10);
    --header-height:       64px;
    --transition:          0.2s ease;
}
*, *::before, *::after { box-sizing: border-box; }
html { font-size: 16px; scroll-behavior: smooth; }
body { font-family: var(--font-family); color: var(--color-text); background: var(--color-bg); line-height: 1.6; min-height: 100vh; display: flex; flex-direction: column; }
main { flex: 1; }
a { color: var(--color-primary); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--color-primary-dark); }
img { max-width: 100%; height: auto; }
h1, h2, h3, h4, h5, h6 { font-weight: 700; line-height: 1.3; color: var(--color-dark); margin-bottom: 0.5rem; }
h1 { font-size: 2rem; } h2 { font-size: 1.5rem; } h3 { font-size: 1.25rem; } h4 { font-size: 1.1rem; }
.text-muted { color: var(--color-text-muted) !important; }
.text-primary { color: var(--color-primary) !important; }

/* HEADER */
.site-header { height: var(--header-height); background: var(--color-white); border-bottom: 1px solid var(--color-border); position: sticky; top: 0; z-index: 1000; box-shadow: var(--shadow-sm); }
.site-header .container { height: 100%; display: flex; align-items: center; gap: 0.75rem; }
.site-logo { font-size: 1.2rem; font-weight: 800; color: var(--color-primary); text-decoration: none; white-space: nowrap; flex-shrink: 0; }
.site-logo:hover { color: var(--color-primary-dark); }
.site-logo span { color: var(--color-dark); }

/* CITY SELECTOR */
.city-selector { flex-shrink: 0; }
.city-btn { display: flex; align-items: center; gap: 0.4rem; padding: 0.4rem 0.85rem; background: var(--color-primary-light); border: 1px solid #bfdbfe; border-radius: 20px; font-size: 0.85rem; font-weight: 600; color: var(--color-primary); cursor: pointer; white-space: nowrap; transition: all var(--transition); }
.city-btn:hover, .city-btn[aria-expanded="true"] { background: var(--color-primary); color: var(--color-white); border-color: var(--color-primary); }
.city-btn::after { display: inline-block; content: ""; border-top: 0.3em solid; border-right: 0.3em solid transparent; border-left: 0.3em solid transparent; margin-left: 0.2rem; opacity: 0.7; }
.city-dropdown { min-width: 200px; border: 1px solid var(--color-border); border-radius: var(--radius-lg); box-shadow: var(--shadow-md); padding: 0.5rem; }
.city-dropdown .dropdown-item { display: flex; align-items: center; gap: 0.5rem; padding: 0.5rem 0.75rem; border-radius: var(--radius-md); font-size: 0.9rem; color: var(--color-text); transition: background var(--transition); }
.city-dropdown .dropdown-item:hover { background: var(--color-primary-light); color: var(--color-primary); }
.city-dropdown .dropdown-item.active { background: var(--color-primary-light); color: var(--color-primary); font-weight: 600; }

/* BUSCADOR */
.header-search { flex: 1; max-width: 440px; position: relative; }
.header-search input { width: 100%; padding: 0.5rem 1rem 0.5rem 2.5rem; border: 1px solid var(--color-border); border-radius: 24px; font-size: 0.9rem; background: var(--color-light); transition: border-color var(--transition), box-shadow var(--transition); }
.header-search input:focus { outline: none; border-color: var(--color-primary); box-shadow: 0 0 0 3px rgba(37,99,235,.1); background: var(--color-white); }
.header-search .search-icon { position: absolute; left: 0.8rem; top: 50%; transform: translateY(-50%); color: var(--color-text-muted); font-size: 0.85rem; pointer-events: none; }

/* HEADER ACTIONS */
.header-actions { display: flex; align-items: center; gap: 0.5rem; margin-left: auto; flex-shrink: 0; }
.lang-switcher { display: flex; gap: 2px; }
.lang-btn { font-size: 0.72rem; font-weight: 700; padding: 3px 6px; border-radius: var(--radius-sm); color: var(--color-text-muted); text-decoration: none; border: 1px solid transparent; transition: all var(--transition); letter-spacing: 0.04em; }
.lang-btn:hover { color: var(--color-primary); border-color: var(--color-border); }
.lang-btn.active { color: var(--color-primary); border-color: var(--color-primary); background: var(--color-primary-light); }

/* NAV */
.site-nav { background: var(--color-white); border-bottom: 1px solid var(--color-border); }
.site-nav .container { display: flex; align-items: center; overflow-x: auto; scrollbar-width: none; }
.site-nav .container::-webkit-scrollbar { display: none; }
.nav-link { display: flex; align-items: center; gap: 0.4rem; padding: 0.7rem 1rem; font-size: 0.875rem; font-weight: 500; color: var(--color-text-muted); text-decoration: none; white-space: nowrap; border-bottom: 2px solid transparent; transition: all var(--transition); flex-shrink: 0; }
.nav-link:hover, .nav-link.active { color: var(--color-primary); border-bottom-color: var(--color-primary); }
.nav-link i { font-size: 0.8rem; }
.nav-city-badge { font-size: 0.7rem; font-weight: 600; padding: 1px 7px; background: var(--color-primary-light); color: var(--color-primary); border-radius: 10px; margin-left: 2px; }

/* FOOTER */
.site-footer { background: var(--color-dark); color: #94a3b8; padding: 3rem 0 1.5rem; margin-top: auto; }
.footer-brand { font-size: 1.25rem; font-weight: 800; color: var(--color-white); margin-bottom: 0.5rem; }
.footer-tagline { font-size: 0.85rem; color: #64748b; margin-bottom: 1.5rem; }
.footer-heading { font-size: 0.75rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.08em; color: #cbd5e1; margin-bottom: 1rem; }
.footer-links { list-style: none; padding: 0; margin: 0; }
.footer-links li { margin-bottom: 0.5rem; }
.footer-links a { color: #64748b; font-size: 0.9rem; text-decoration: none; transition: color var(--transition); }
.footer-links a:hover { color: var(--color-white); }
.footer-bottom { border-top: 1px solid #334155; padding-top: 1.5rem; margin-top: 2rem; display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 0.5rem; font-size: 0.85rem; color: #475569; }

/* BOTONES */
.btn { display: inline-flex; align-items: center; gap: 0.4rem; padding: 0.5rem 1.25rem; border-radius: var(--radius-md); font-size: 0.9rem; font-weight: 600; text-decoration: none; border: none; cursor: pointer; transition: all var(--transition); white-space: nowrap; }
.btn-primary { background: var(--color-primary); color: var(--color-white); }
.btn-primary:hover { background: var(--color-primary-dark); color: var(--color-white); }
.btn-outline { background: transparent; color: var(--color-primary); border: 1px solid var(--color-primary); }
.btn-outline:hover { background: var(--color-primary); color: var(--color-white); }
.btn-sm { padding: 0.35rem 0.85rem; font-size: 0.8rem; }
.btn-lg { padding: 0.75rem 1.75rem; font-size: 1rem; }

/* CARDS */
.card { background: var(--color-white); border: 1px solid var(--color-border); border-radius: var(--radius-lg); overflow: hidden; transition: box-shadow var(--transition), transform var(--transition); }
.card:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }
.card-body { padding: 1rem; }
.card-title { font-size: 0.95rem; font-weight: 600; margin-bottom: 0.25rem; color: var(--color-dark); display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.card-subtitle { font-size: 0.8rem; color: var(--color-text-muted); margin-bottom: 0.5rem; }
.card-price { font-size: 1.1rem; font-weight: 700; color: var(--color-primary); }
.card-price-original { font-size: 0.85rem; color: var(--color-text-muted); text-decoration: line-through; margin-left: 0.35rem; }

/* BADGES */
.badge { display: inline-flex; align-items: center; gap: 0.25rem; padding: 0.2rem 0.6rem; border-radius: 20px; font-size: 0.75rem; font-weight: 600; }
.badge-primary { background: var(--color-primary-light); color: var(--color-primary); }
.badge-success { background: #dcfce7; color: var(--color-success); }
.badge-warning { background: #fef3c7; color: var(--color-warning); }
.badge-danger  { background: #fee2e2; color: var(--color-danger); }

/* FLASH */
.flash-messages { position: fixed; top: calc(var(--header-height) + 1rem); right: 1rem; z-index: 9999; display: flex; flex-direction: column; gap: 0.5rem; max-width: 380px; }
.flash { display: flex; align-items: center; gap: 0.75rem; padding: 0.875rem 1rem; border-radius: var(--radius-md); box-shadow: var(--shadow-md); font-size: 0.9rem; animation: slideIn 0.3s ease; }
.flash-success { background: #f0fdf4; border-left: 3px solid var(--color-success); color: #166534; }
.flash-error   { background: #fef2f2; border-left: 3px solid var(--color-danger);  color: #991b1b; }
.flash-warning { background: #fffbeb; border-left: 3px solid var(--color-warning); color: #92400e; }
.flash-info    { background: var(--color-primary-light); border-left: 3px solid var(--color-primary); color: #1e40af; }
.flash-close { margin-left: auto; background: none; border: none; cursor: pointer; opacity: 0.5; font-size: 1rem; padding: 0; line-height: 1; }
.flash-close:hover { opacity: 1; }
@keyframes slideIn { from { opacity: 0; transform: translateX(20px); } to { opacity: 1; transform: translateX(0); } }

/* MODALS */
.modal-content { border: none; border-radius: var(--radius-xl); box-shadow: 0 8px 24px rgba(0,0,0,.12); }
.modal-header { padding: 1.25rem 1.5rem 0.75rem; }
.modal-body   { padding: 0.75rem 1.5rem 1.5rem; }

/* LAYOUT */
.container { width: 100%; max-width: 1280px; margin: 0 auto; padding: 0 1rem; }
.section    { padding: 3rem 0; }
.section-sm { padding: 1.5rem 0; }
.divider    { border: none; border-top: 1px solid var(--color-border); margin: 1.5rem 0; }
.grid-products { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 1.25rem; }
.grid-stores   { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 1.25rem; }

/* FORMS */
.form-control { display: block; width: 100%; padding: 0.5rem 0.75rem; border: 1px solid var(--color-border); border-radius: var(--radius-md); font-size: 0.9rem; transition: border-color var(--transition), box-shadow var(--transition); }
.form-control:focus { outline: none; border-color: var(--color-primary); box-shadow: 0 0 0 3px rgba(37,99,235,.1); }
.form-label { display: block; margin-bottom: 0.4rem; font-size: 0.875rem; font-weight: 500; color: var(--color-dark); }
.form-select { display: block; width: 100%; padding: 0.5rem 0.75rem; border: 1px solid var(--color-border); border-radius: var(--radius-md); font-size: 0.9rem; background: var(--color-white); cursor: pointer; }
.form-select:focus { outline: none; border-color: var(--color-primary); }
.form-check-input { width: 1em; height: 1em; cursor: pointer; }
.form-check-label { cursor: pointer; font-size: 0.9rem; }
.form-check-inline { display: inline-flex; align-items: center; gap: 0.4rem; }

/* PAGINATION */
.pagination { display: flex; list-style: none; padding: 0; margin: 0; gap: 4px; }
.page-link { display: block; padding: 0.4rem 0.75rem; border: 1px solid var(--color-border); border-radius: var(--radius-md); color: var(--color-primary); text-decoration: none; font-size: 0.875rem; transition: all var(--transition); }
.page-link:hover { background: var(--color-primary); color: var(--color-white); border-color: var(--color-primary); }
.page-item.active .page-link { background: var(--color-primary); color: var(--color-white); border-color: var(--color-primary); }

/* TABLE */
.table { width: 100%; border-collapse: collapse; }
.table th, .table td { padding: 0.6rem 0.75rem; border-bottom: 1px solid var(--color-border); text-align: left; font-size: 0.875rem; }
.table th { font-weight: 600; color: var(--color-text-muted); background: var(--color-light); }
.table-sm th, .table-sm td { padding: 0.35rem 0.5rem; }

/* RESPONSIVE */
@media (max-width: 1024px) { .header-search { max-width: 280px; } }
@media (max-width: 768px) { .header-search { display: none; } .lang-switcher { display: none; } .grid-products { grid-template-columns: repeat(2, 1fr); } .grid-stores { grid-template-columns: 1fr; } h1 { font-size: 1.5rem; } }
@media (max-width: 480px) { .grid-products { grid-template-columns: repeat(2, 1fr); gap: 0.75rem; } .site-logo { font-size: 1rem; } }