/**
 * COVACA Shopping App - Main Stylesheet
 * Modern, clean, mobile-first design
 */

/* ============================================
   CSS VARIABLES & RESET
   ============================================ */

:root {
    --primary: #2874f0;
    --primary-dark: #1a5fd6;
    --secondary: #fb641b;
    --success: #388e3c;
    --warning: #ff9f00;
    --danger: #ff6161;
    --info: #1976d2;

    --text-primary: #212121;
    --text-secondary: #878787;
    --text-muted: #b2b2b2;

    --bg-primary: #ffffff;
    --bg-secondary: #f1f3f6;
    --bg-tertiary: #e8eaf6;

    --border: #e0e0e0;
    --shadow: 0 2px 4px rgba(0,0,0,0.08);
    --shadow-lg: 0 4px 12px rgba(0,0,0,0.15);

    --radius: 8px;
    --radius-lg: 12px;
    --radius-sm: 4px;

    --bottom-nav-height: 60px;
    --header-height: 56px;

    --font-family: 'Roboto', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --transition: all 0.3s ease;
}

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

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-family);
    background: var(--bg-secondary);
    color: var(--text-primary);
    line-height: 1.5;
    min-height: 100vh;
    padding-bottom: var(--bottom-nav-height);
}

a {
    color: var(--primary);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    color: var(--primary-dark);
}

img {
    max-width: 100%;
    height: auto;
}

/* ============================================
   UTILITY CLASSES
   ============================================ */

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 16px;
}

.container-fluid {
    padding: 0 16px;
}

.d-none { display: none !important; }
.d-block { display: block !important; }
.d-flex { display: flex !important; }
.d-inline-flex { display: inline-flex !important; }

.flex-1 { flex: 1; }
.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.justify-center { justify-content: center; }

.gap-1 { gap: 8px; }
.gap-2 { gap: 16px; }
.gap-3 { gap: 24px; }

.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.text-primary { color: var(--primary); }
.text-secondary { color: var(--text-secondary); }
.text-success { color: var(--success); }
.text-danger { color: var(--danger); }
.text-warning { color: var(--warning); }

.bg-white { background: var(--bg-primary); }
.bg-secondary { background: var(--bg-secondary); }

.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 24px; }

.p-1 { padding: 8px; }
.p-2 { padding: 16px; }
.p-3 { padding: 24px; }

.w-100 { width: 100%; }
.h-100 { height: 100%; }

.position-relative { position: relative; }
.position-absolute { position: absolute; }

/* ============================================
   BUTTONS
   ============================================ */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    font-size: 14px;
    font-weight: 500;
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    transition: var(--transition);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    min-height: 48px;
}

.btn-primary {
    background: var(--primary);
    color: white;
}

.btn-primary:hover {
    background: var(--primary-dark);
    color: white;
}

.btn-secondary {
    background: white;
    color: var(--primary);
    border: 1px solid var(--primary);
}

.btn-secondary:hover {
    background: var(--bg-tertiary);
}

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

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

.btn-warning {
    background: var(--warning);
    color: white;
}

.btn-block {
    width: 100%;
}

.btn-sm {
    padding: 8px 16px;
    font-size: 12px;
    min-height: 36px;
}

.btn-lg {
    padding: 16px 32px;
    font-size: 16px;
    min-height: 56px;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn-google {
    background: white;
    color: var(--text-primary);
    border: 1px solid var(--border);
}

.btn-google:hover {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

.btn-google svg {
    flex-shrink: 0;
}

.btn-link {
    background: transparent;
    color: var(--primary);
    padding: 0;
    min-height: auto;
    text-transform: none;
    letter-spacing: 0;
}

.btn-link:hover {
    text-decoration: underline;
}

/* ============================================
   FORMS
   ============================================ */

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
}

.form-control {
    width: 100%;
    padding: 14px 16px;
    font-size: 16px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: white;
    transition: var(--transition);
    font-family: inherit;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(40, 116, 240, 0.1);
}

.form-control:disabled {
    background: var(--bg-secondary);
    cursor: not-allowed;
}

.form-control::placeholder {
    color: var(--text-muted);
}

.form-hint {
    display: block;
    margin-top: 6px;
    font-size: 12px;
    color: var(--text-secondary);
}

.form-error {
    display: block;
    margin-top: 6px;
    font-size: 12px;
    color: var(--danger);
}

select.form-control {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23666' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 16px center;
    padding-right: 40px;
}

textarea.form-control {
    min-height: 120px;
    resize: vertical;
}

/* Checkbox & Radio */
.form-check {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 12px;
}

.form-check input[type="checkbox"],
.form-check input[type="radio"] {
    width: 20px;
    height: 20px;
    accent-color: var(--primary);
}

/* ============================================
   ALERTS
   ============================================ */

.alert {
    padding: 16px;
    border-radius: var(--radius);
    margin-bottom: 16px;
    font-size: 14px;
}

.alert-success {
    background: #e8f5e9;
    color: var(--success);
    border: 1px solid #c8e6c9;
}

.alert-error,
.alert-danger {
    background: #ffebee;
    color: #c62828;
    border: 1px solid #ffcdd2;
}

.alert-warning {
    background: #fff3e0;
    color: #e65100;
    border: 1px solid #ffe0b2;
}

.alert-info {
    background: #e3f2fd;
    color: #1565c0;
    border: 1px solid #bbdefb;
}

/* ============================================
   CARDS
   ============================================ */

.card {
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    overflow: hidden;
    margin-bottom: 16px;
}

.card-header {
    padding: 16px;
    border-bottom: 1px solid var(--border);
}

.card-body {
    padding: 16px;
}

.card-footer {
    padding: 16px;
    border-top: 1px solid var(--border);
    background: var(--bg-secondary);
}

.card-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 8px;
}

.card-subtitle {
    font-size: 14px;
    color: var(--text-secondary);
}

/* Product Card */
.product-card {
    background: white;
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    height: 100%;
    display: flex;
    flex-direction: column;
}

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

.product-image {
    position: relative;
    aspect-ratio: 1;
    overflow: hidden;
    background: var(--bg-secondary);
}

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

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

.product-badge {
    position: absolute;
    top: 8px;
    left: 8px;
    background: var(--success);
    color: white;
    padding: 4px 8px;
    border-radius: var(--radius-sm);
    font-size: 11px;
    font-weight: 600;
}

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

.product-badge.new {
    background: var(--primary);
}

.product-content {
    padding: 12px;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.product-title {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 8px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    line-height: 1.4;
}

.product-brand {
    font-size: 12px;
    color: var(--text-secondary);
    margin-bottom: 4px;
}

.product-rating {
    display: flex;
    align-items: center;
    gap: 4px;
    margin-bottom: 8px;
}

.rating-badge {
    display: inline-flex;
    align-items: center;
    gap: 2px;
    background: var(--success);
    color: white;
    padding: 2px 6px;
    border-radius: var(--radius-sm);
    font-size: 11px;
    font-weight: 600;
}

.rating-count {
    font-size: 12px;
    color: var(--text-secondary);
}

.product-price {
    margin-top: auto;
}

.price-current {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-primary);
}

.price-original {
    font-size: 14px;
    color: var(--text-secondary);
    text-decoration: line-through;
    margin-left: 8px;
}

.price-discount {
    font-size: 13px;
    color: var(--success);
    font-weight: 500;
    margin-left: 8px;
}

/* ============================================
   GRID SYSTEM
   ============================================ */

.row {
    display: flex;
    flex-wrap: wrap;
    margin: 0 -8px;
}

.col {
    flex: 1;
    padding: 0 8px;
}

.col-6 { width: 50%; padding: 0 8px; }
.col-12 { width: 100%; padding: 0 8px; }

/* Product Grid */
.product-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
}

@media (min-width: 480px) {
    .product-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (min-width: 768px) {
    .product-grid {
        grid-template-columns: repeat(4, 1fr);
        gap: 16px;
    }
}

@media (min-width: 1024px) {
    .product-grid {
        grid-template-columns: repeat(5, 1fr);
    }
}

/* ============================================
   SECTIONS
   ============================================ */

.section {
    margin-bottom: 24px;
}

.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
    padding: 0 4px;
}

.section-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
}

.section-link {
    font-size: 14px;
    font-weight: 500;
    color: var(--primary);
    display: flex;
    align-items: center;
    gap: 4px;
}

/* ============================================
   BADGES
   ============================================ */

.badge {
    display: inline-flex;
    align-items: center;
    padding: 4px 10px;
    border-radius: 100px;
    font-size: 12px;
    font-weight: 500;
}

.badge-primary {
    background: rgba(40, 116, 240, 0.1);
    color: var(--primary);
}

.badge-success {
    background: rgba(56, 142, 60, 0.1);
    color: var(--success);
}

.badge-warning {
    background: rgba(255, 159, 0, 0.1);
    color: var(--warning);
}

.badge-danger {
    background: rgba(255, 97, 97, 0.1);
    color: var(--danger);
}

/* Status badges */
.status-badge {
    display: inline-flex;
    align-items: center;
    padding: 6px 12px;
    border-radius: var(--radius);
    font-size: 12px;
    font-weight: 500;
    text-transform: capitalize;
}

.status-pending { background: #fff3e0; color: #e65100; }
.status-confirmed { background: #e3f2fd; color: #1565c0; }
.status-processing { background: #f3e5f5; color: #7b1fa2; }
.status-shipped { background: #e8eaf6; color: #3f51b5; }
.status-delivered { background: #e8f5e9; color: var(--success); }
.status-cancelled { background: #ffebee; color: #c62828; }
.status-paid { background: #e8f5e9; color: var(--success); }

/* ============================================
   EMPTY STATES
   ============================================ */

.empty-state {
    text-align: center;
    padding: 60px 20px;
}

.empty-icon {
    font-size: 64px;
    margin-bottom: 16px;
    opacity: 0.5;
}

.empty-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.empty-text {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 24px;
}

/* ============================================
   LOADING SPINNER
   ============================================ */

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid rgba(40, 116, 240, 0.2);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

.skeleton {
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    border-radius: var(--radius);
}

@keyframes shimmer {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* ============================================
   PAGINATION
   ============================================ */

.pagination {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin: 32px 0;
}

.pagination a,
.pagination span {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 40px;
    height: 40px;
    padding: 0 12px;
    border-radius: var(--radius);
    font-size: 14px;
    font-weight: 500;
    background: white;
    color: var(--text-primary);
    border: 1px solid var(--border);
    transition: var(--transition);
}

.pagination a:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.pagination .current {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

.pagination .disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* ============================================
   PRINT STYLES
   ============================================ */

@media print {
    .no-print,
    .bottom-nav,
    .app-header {
        display: none !important;
    }

    body {
        padding-bottom: 0;
        background: white;
    }
}