/* ===========================
   CSS Variables & Theme
   =========================== */
:root {
    /* Colors */
    --primary: #6366f1;
    --primary-light: #818cf8;
    --primary-dark: #4f46e5;
    --accent: #22d3ee;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;

    /* Supermarket Colors */
    --california: #e63946;
    --yaguar: #2a9d8f;
    --hiperlibertad: #e9c46a;
    --multiexpress: #264653;
    --masonline: #f26522;

    /* Neutrals */
    --bg: #0f0f1a;
    --bg-light: #1a1a2e;
    --bg-card: #16213e;
    --text: #f8fafc;
    --text-muted: #94a3b8;
    --border: rgba(255, 255, 255, 0.1);

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
    --gradient-card: linear-gradient(145deg, rgba(26, 26, 46, 0.9) 0%, rgba(22, 33, 62, 0.8) 100%);

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -1px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -2px rgba(0, 0, 0, 0.3);
    --shadow-glow: 0 0 40px rgba(99, 102, 241, 0.3);

    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-full: 9999px;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 200ms ease;
    --transition-slow: 300ms ease;
}

/* ===========================
   Reset & Base
   =========================== */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

/* ===========================
   Header
   =========================== */
.header {
    background: rgba(15, 15, 26, 0.95);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-md) 0;
    gap: var(--space-lg);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.logo-icon {
    font-size: 1.75rem;
}

.logo h1 {
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.accent {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav {
    display: flex;
    gap: var(--space-xs);
}

.nav-btn {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-sm) var(--space-md);
    background: transparent;
    border: 1px solid transparent;
    border-radius: var(--radius-full);
    color: var(--text-muted);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-normal);
}

.nav-btn:hover {
    background: var(--bg-light);
    color: var(--text);
}

.nav-btn.active {
    background: var(--gradient-primary);
    color: white;
    border-color: transparent;
}

.nav-btn .icon {
    font-size: 1rem;
}

/* ===========================
   Main Content
   =========================== */
.main {
    padding: var(--space-xl) 0 var(--space-2xl);
}

.view {
    display: none;
}

.view.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ===========================
   Hero Section
   =========================== */
.hero {
    text-align: center;
    margin-bottom: var(--space-xl);
}

.hero h2 {
    font-size: clamp(1.75rem, 5vw, 2.5rem);
    font-weight: 800;
    margin-bottom: var(--space-sm);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero p {
    color: var(--text-muted);
    font-size: 1.1rem;
}

/* ===========================
   Search Container
   =========================== */
.search-container {
    max-width: 800px;
    margin: 0 auto var(--space-xl);
}

.search-form {
    margin-bottom: var(--space-lg);
}

.search-input-wrapper {
    display: flex;
    align-items: center;
    background: var(--bg-light);
    border: 2px solid var(--border);
    border-radius: var(--radius-xl);
    padding: var(--space-sm);
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-md);
}

.search-input-wrapper:focus-within {
    border-color: var(--primary);
    box-shadow: var(--shadow-glow);
}

.search-icon {
    padding: 0 var(--space-md);
    font-size: 1.25rem;
    opacity: 0.5;
}

#search-input {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text);
    font-size: 1rem;
    padding: var(--space-md) 0;
    outline: none;
}

#search-input::placeholder {
    color: var(--text-muted);
}

.search-btn {
    background: var(--gradient-primary);
    border: none;
    border-radius: var(--radius-lg);
    color: white;
    font-size: 1rem;
    font-weight: 600;
    padding: var(--space-md) var(--space-xl);
    cursor: pointer;
    transition: all var(--transition-normal);
}

.search-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.search-btn:active {
    transform: translateY(0);
}

.search-btn .btn-loading {
    display: none;
}

.search-btn.loading .btn-text {
    display: none;
}

.search-btn.loading .btn-loading {
    display: inline;
    animation: spin 1s linear infinite;
}

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

/* ===========================
   Filter Chips
   =========================== */
.filter-container {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    flex-wrap: wrap;
}

.filter-label {
    color: var(--text-muted);
    font-size: 0.875rem;
}

.filter-chips {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
}

.chip {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-sm) var(--space-md);
    background: var(--bg-light);
    border: 1px solid var(--border);
    border-radius: var(--radius-full);
    color: var(--text-muted);
    font-size: 0.8125rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.chip:hover {
    border-color: var(--primary);
    color: var(--text);
}

.chip.active {
    background: var(--primary);
    border-color: var(--primary);
    color: white;
}

.chip-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
}

/* ===========================
   Results Info
   =========================== */
.results-info {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-lg);
    flex-wrap: wrap;
    gap: var(--space-md);
}

#results-count {
    color: var(--text-muted);
    font-size: 0.9375rem;
}

.sort-options {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.sort-options label {
    color: var(--text-muted);
    font-size: 0.875rem;
}

#sort-select {
    background: var(--bg-light);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    color: var(--text);
    padding: var(--space-sm) var(--space-md);
    font-size: 0.875rem;
    cursor: pointer;
}

/* ===========================
   Loading State
   =========================== */
.loading {
    text-align: center;
    padding: var(--space-2xl);
}

.loading-spinner {
    width: 50px;
    height: 50px;
    border: 3px solid var(--border);
    border-top-color: var(--primary);
    border-radius: 50%;
    margin: 0 auto var(--space-lg);
    animation: spin 0.8s linear infinite;
}

.loading p {
    color: var(--text-muted);
}

/* ===========================
   Results Grid
   =========================== */
.results-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--space-lg);
}

/* ===========================
   Product Card
   =========================== */
.product-card {
    background: var(--gradient-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    overflow: hidden;
    transition: all var(--transition-normal);
    position: relative;
}

.product-card:hover {
    transform: translateY(-4px);
    border-color: var(--primary);
    box-shadow: var(--shadow-glow);
}

.product-card.cheapest {
    border-color: var(--success);
    box-shadow: 0 0 30px rgba(16, 185, 129, 0.2);
}

.product-image-wrapper {
    position: relative;
    height: 180px;
    background: var(--bg-light);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.product-image {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    transition: transform var(--transition-slow);
}

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

.product-badges {
    position: absolute;
    top: var(--space-sm);
    left: var(--space-sm);
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.badge {
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.02em;
}

.badge-cheapest {
    background: var(--success);
    color: white;
}

.badge-offer {
    background: var(--danger);
    color: white;
}

.badge-savings {
    background: var(--warning);
    color: black;
}

.supermarket-tag {
    position: absolute;
    top: var(--space-sm);
    right: var(--space-sm);
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-sm);
    font-size: 0.7rem;
    font-weight: 600;
    color: white;
}

.supermarket-tag.california {
    background: var(--california);
}

.supermarket-tag.yaguar {
    background: var(--yaguar);
}

.supermarket-tag.hiperlibertad {
    background: var(--hiperlibertad);
    color: #1a1a2e;
}

.supermarket-tag.multiexpress {
    background: var(--multiexpress);
}

.supermarket-tag.masonline {
    background: var(--masonline);
}

.product-info {
    padding: var(--space-md);
}

.product-name {
    font-size: 0.9375rem;
    font-weight: 600;
    line-height: 1.4;
    margin-bottom: var(--space-sm);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.product-prices {
    display: flex;
    align-items: baseline;
    gap: var(--space-sm);
    margin-bottom: var(--space-md);
}

.price-current {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--success);
}

.price-original {
    font-size: 0.875rem;
    color: var(--text-muted);
    text-decoration: line-through;
}

.product-actions {
    display: flex;
    gap: var(--space-sm);
}

.action-btn {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-xs);
    padding: var(--space-sm);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    background: transparent;
    color: var(--text-muted);
    font-size: 0.8125rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.action-btn:hover {
    background: var(--bg-light);
    color: var(--text);
    border-color: var(--primary);
}

.action-btn.favorite.active {
    background: rgba(239, 68, 68, 0.1);
    border-color: var(--danger);
    color: var(--danger);
}

.action-btn.view-link {
    color: var(--primary);
    text-decoration: none;
}

/* ===========================
   Empty State
   =========================== */
.empty-state {
    text-align: center;
    padding: var(--space-2xl);
}

.empty-icon {
    font-size: 4rem;
    display: block;
    margin-bottom: var(--space-lg);
    opacity: 0.5;
}

.empty-state h3 {
    font-size: 1.25rem;
    margin-bottom: var(--space-sm);
}

.empty-state p {
    color: var(--text-muted);
}

/* ===========================
   Section Title
   =========================== */
.section-title {
    font-size: 1.5rem;
    margin-bottom: var(--space-xl);
}

/* ===========================
   History List
   =========================== */
.history-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.history-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-md) var(--space-lg);
    background: var(--bg-light);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.history-item:hover {
    border-color: var(--primary);
    background: var(--bg-card);
}

.history-query {
    font-weight: 500;
}

.history-meta {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
    color: var(--text-muted);
    font-size: 0.875rem;
}

/* ===========================
   Modal
   =========================== */
.modal {
    position: fixed;
    inset: 0;
    z-index: 200;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-lg);
}

.modal-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(4px);
}

.modal-content {
    position: relative;
    background: var(--bg-light);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    max-width: 500px;
    width: 100%;
    max-height: 80vh;
    overflow-y: auto;
    animation: modalIn 0.3s ease;
}

@keyframes modalIn {
    from {
        opacity: 0;
        transform: scale(0.95);
    }

    to {
        opacity: 1;
        transform: scale(1);
    }
}

.modal-close {
    position: absolute;
    top: var(--space-md);
    right: var(--space-md);
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 50%;
    color: var(--text);
    font-size: 1.25rem;
    cursor: pointer;
    transition: all var(--transition-fast);
    z-index: 1;
}

.modal-close:hover {
    background: var(--danger);
    border-color: var(--danger);
}

/* ===========================
   Toast
   =========================== */
.toast {
    position: fixed;
    bottom: var(--space-xl);
    left: 50%;
    transform: translateX(-50%) translateY(100%);
    background: var(--bg-light);
    border: 1px solid var(--primary);
    border-radius: var(--radius-lg);
    padding: var(--space-md) var(--space-xl);
    box-shadow: var(--shadow-lg);
    transition: transform var(--transition-normal);
    z-index: 300;
}

.toast.show {
    transform: translateX(-50%) translateY(0);
}

/* ===========================
   Utilities
   =========================== */
.hidden {
    display: none !important;
}

/* ===========================
   Responsive
   =========================== */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: var(--space-md);
    }

    .nav {
        width: 100%;
        justify-content: center;
    }

    .nav-btn span:not(.icon) {
        display: none;
    }

    .nav-btn {
        padding: var(--space-sm);
    }

    .nav-btn .icon {
        font-size: 1.25rem;
    }

    .search-input-wrapper {
        flex-direction: column;
        padding: var(--space-sm);
        gap: var(--space-sm);
    }

    .search-icon {
        display: none;
    }

    #search-input {
        width: 100%;
        text-align: center;
        padding: var(--space-md);
    }

    .search-btn {
        width: 100%;
    }

    .filter-container {
        flex-direction: column;
        align-items: flex-start;
    }

    .results-info {
        flex-direction: column;
        align-items: flex-start;
    }

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

    .history-item {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-sm);
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--space-md);
    }

    .hero h2 {
        font-size: 1.5rem;
    }

    .product-card {
        border-radius: var(--radius-lg);
    }
}