/* --- Header / Navbar --- */
.site-header {
    position: sticky;
    top: 0;
    z-index: 1050;
    background: linear-gradient(135deg, var(--brand-green-800) 0%, var(--brand-green-600) 100%);
    box-shadow: 0 2px 12px rgba(0,0,0,0.15);
}

.site-header .navbar { padding: 0.5rem 0; }

.site-header .navbar-brand {
    font-size: 1.35rem;
    font-weight: 700;
    color: #fff !important;
    letter-spacing: -0.5px;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.site-header .navbar-brand img {
    height: 36px;
    width: auto;
}
.site-header .navbar-brand:hover { color: #fff !important; }

.site-header .navbar-brand .brand-subtitle {
    font-size: 0.65rem;
    font-weight: 400;
    opacity: 0.8;
    text-transform: uppercase;
    letter-spacing: 1px;
    display: block;
    line-height: 1;
}

.site-header .nav-link {
    color: rgba(255,255,255,0.85) !important;
    font-weight: 500;
    font-size: 0.9rem;
    padding: 0.5rem 1rem !important;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}
.site-header .nav-link:hover {
    color: #fff !important;
    background-color: rgba(255,255,255,0.1);
}
.site-header .nav-link.active {
    color: #fff !important;
    background-color: rgba(255,255,255,0.15);
}

.site-header .nav-link i { font-size: 1.1rem; }

.site-header .btn-login {
    background: rgba(255,255,255,0.15);
    border: 1px solid rgba(255,255,255,0.3);
    color: #fff !important;
    border-radius: var(--radius-full);
    padding: 0.4rem 1.2rem !important;
    font-size: 0.85rem;
    font-weight: 600;
    transition: all var(--transition-fast);
}
.site-header .btn-login:hover {
    background: rgba(255,255,255,0.25);
    color: #fff !important;
}

/* Theme toggle in header */
.theme-toggle-btn {
    background: none;
    border: 1px solid rgba(255,255,255,0.3);
    color: rgba(255,255,255,0.85);
    border-radius: var(--radius-full);
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-size: 1rem;
}
.theme-toggle-btn:hover {
    background: rgba(255,255,255,0.15);
    color: #fff;
}

html.dark-mode .site-header {
    background: linear-gradient(135deg, #0a1a0a 0%, #142814 100%);
    box-shadow: 0 2px 12px rgba(0,0,0,0.4);
}

/* Mobile nav */
.navbar-toggler {
    border: 1px solid rgba(255,255,255,0.3);
    padding: 0.35rem 0.6rem;
}
.navbar-toggler:focus { box-shadow: 0 0 0 2px rgba(255,255,255,0.3); }
.navbar-toggler-icon {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba%28255, 255, 255, 0.85%29' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}

/* --- Hero Section --- */
.hero-section {
    background: linear-gradient(160deg, var(--brand-green-50) 0%, var(--bg-page) 100%);
    padding: var(--space-2xl) 0 var(--space-xl);
    text-align: center;
}
.hero-section h1 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--space-sm);
}
.hero-section h1 .highlight {
    color: var(--brand-green-500);
}
.hero-section .hero-desc {
    font-size: 1.05rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

html.dark-mode .hero-section {
    background: linear-gradient(160deg, var(--bg-surface) 0%, var(--bg-page) 100%);
}

/* --- Filter Bar --- */
.filter-bar form {
    background-color: var(--bg-surface);
    padding: var(--space-lg);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
    position: relative;
    z-index: 10;
}
.filter-bar .form-label {
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-secondary);
    margin-bottom: 0.35rem;
}
.filter-bar .form-control,
.filter-bar .form-select {
    font-size: 0.9rem;
    padding: 0.65rem 0.9rem;
}

.btn-filter {
    background: linear-gradient(135deg, var(--brand-green-500), var(--brand-green-600));
    color: #fff;
    border: none;
    font-weight: 600;
    padding: 0.7rem 1.5rem;
    border-radius: var(--radius-md);
    font-size: 0.95rem;
    transition: all var(--transition-fast);
    box-shadow: var(--shadow-sm);
}
.btn-filter:hover {
    background: linear-gradient(135deg, var(--brand-green-600), var(--brand-green-700));
    color: #fff;
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}
.btn-filter:active {
    transform: translateY(0);
}

/* --- Results Bar (between filters and results) --- */
.results-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: var(--space-sm);
    margin: var(--space-lg) 0 var(--space-md);
    padding: var(--space-sm) 0;
}
.results-bar .results-info {
    font-size: 0.85rem;
    color: var(--text-muted);
}
.results-bar .results-info strong {
    color: var(--text-primary);
    font-weight: 600;
}

/* --- Price Cards --- */
#prices .price-card {
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    background: var(--bg-surface);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
    overflow: hidden;
    height: 100%;
}
#prices .price-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--brand-green-200);
}

.price-card .price-card-header {
    padding: var(--space-sm) var(--space-md);
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-surface-alt);
}
.price-card .price-card-header .product-name {
    font-weight: 600;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.3px;
    color: var(--text-primary);
}
.price-card .price-card-header .state-badge {
    font-size: 0.7rem;
}

.price-card .price-card-body {
    padding: var(--space-md);
    text-align: center;
}
.price-card .price-value {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--brand-green-500);
    line-height: 1.2;
    margin-bottom: 0.15rem;
}
.price-card .price-unit-label {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.price-card .price-card-footer {
    padding: var(--space-sm) var(--space-md);
    border-top: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: var(--bg-surface-alt);
}
.price-card .price-date {
    font-size: 0.75rem;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 0.3rem;
}
.price-card .price-date i { font-size: 0.85rem; }

.price-card .btn-stats {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--brand-green-50);
    color: var(--brand-green-500);
    border: none;
    transition: all var(--transition-fast);
    font-size: 0.9rem;
}
.price-card .btn-stats:hover {
    background: var(--brand-green-500);
    color: #fff;
}

html.dark-mode .price-card .price-value {
    color: var(--brand-green-400);
}
html.dark-mode .price-card .btn-stats {
    background: rgba(76,175,80,0.15);
    color: var(--brand-green-400);
}
html.dark-mode .price-card .btn-stats:hover {
    background: var(--brand-green-500);
    color: #fff;
}
html.dark-mode .price-card:hover {
    border-color: var(--brand-green-600);
}

/* --- Price Table --- */
#prices-table .table-wrapper {
    box-shadow: var(--shadow-sm);
}
#prices-table .table-product {
    font-weight: 600;
    color: #1a1a2e;
}
#prices-table .table-value {
    font-weight: 700;
    font-family: var(--font-mono);
    font-size: 0.95rem;
    color: var(--brand-green-500);
}
#prices-table .table-state {
    white-space: nowrap;
}
html.dark-mode #prices-table .table-value {
    color: var(--brand-green-400);
}

/* --- Pagination Info --- */
.pagination-info {
    font-size: 0.8rem;
    color: var(--text-muted);
    text-align: center;
    margin-top: var(--space-sm);
}

/* --- Product Statistics --- */
.stats-summary {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--space-md);
    margin-bottom: var(--space-xl);
}
.stats-summary .stat-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--space-md);
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
}
.stats-summary .stat-card:hover {
    box-shadow: var(--shadow-md);
}
.stats-summary .stat-card .stat-label {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-muted);
    margin-bottom: var(--space-xs);
}
.stats-summary .stat-card .stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    font-family: var(--font-mono);
}
.stat-card.stat-min .stat-value { color: var(--value-min); }
.stat-card.stat-avg .stat-value { color: var(--value-mid); }
.stat-card.stat-max .stat-value { color: var(--value-max); }
.stat-card.stat-current .stat-value { color: var(--brand-green-500); }

html.dark-mode .stats-summary .stat-card {
    background: var(--bg-surface);
    border-color: var(--border-color);
}

/* Chart container */
.chart-container {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--space-md);
    box-shadow: var(--shadow-sm);
    margin-bottom: var(--space-xl);
}

/* --- Footer --- */
.site-footer {
    background: var(--brand-green-800);
    color: rgba(255,255,255,0.8);
    padding: var(--space-2xl) 0 var(--space-md);
    margin-top: var(--space-2xl);
}
.site-footer h5 {
    color: #fff;
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: var(--space-md);
}
.site-footer p, .site-footer li {
    font-size: 0.85rem;
    color: rgba(255,255,255,0.7);
}
.site-footer a {
    color: rgba(255,255,255,0.7);
    transition: color var(--transition-fast);
}
.site-footer a:hover { color: #fff; }

.site-footer .footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.15);
    padding-top: var(--space-md);
    margin-top: var(--space-xl);
    text-align: center;
    font-size: 0.8rem;
    color: rgba(255,255,255,0.5);
}

html.dark-mode .site-footer {
    background: #0a120a;
}

/* --- Responsive --- */
@media (max-width: 768px) {
    .hero-section h1 { font-size: 1.5rem; }
    .hero-section .hero-desc { font-size: 0.95rem; }
    .filter-bar form { padding: var(--space-md); }
    .results-bar { flex-direction: column; align-items: flex-start; }
    .stats-summary { grid-template-columns: repeat(2, 1fr); }
    .price-card .price-value { font-size: 1.4rem; }
}

@media (max-width: 576px) {
    .hero-section { padding: var(--space-xl) 0 var(--space-md); }
    .stats-summary { grid-template-columns: 1fr 1fr; }
    .site-header .navbar-brand .brand-subtitle { display: none; }
}

/* --- Institutional Content (Privacy Policy / Terms) --- */
.institutional-content {
    max-width: 800px;
    margin: 0 auto;
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--space-2xl);
    box-shadow: var(--shadow-sm);
}
.institutional-content h1,
.institutional-content h2,
.institutional-content h3 {
    color: var(--text-primary);
    margin-top: 1.5em;
    margin-bottom: 0.5em;
}
.institutional-content h1 { font-size: 1.5rem; }
.institutional-content h2 { font-size: 1.25rem; }
.institutional-content h3 { font-size: 1.1rem; }
.institutional-content p {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 1em;
    font-size: 0.95rem;
}
.institutional-content ul,
.institutional-content ol {
    color: var(--text-secondary);
    padding-left: 1.5rem;
    margin-bottom: 1em;
}
.institutional-content li {
    line-height: 1.7;
    margin-bottom: 0.35rem;
}
.institutional-content a {
    color: var(--brand-green-500);
    text-decoration: underline;
}
.institutional-content a:hover {
    color: var(--brand-orange);
}
.institutional-content blockquote {
    border-left: 3px solid var(--brand-green-500);
    padding: 0.75rem 1rem;
    margin: 1rem 0;
    background: var(--bg-surface-alt);
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    color: var(--text-secondary);
    font-style: italic;
}
.institutional-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 1rem 0;
    font-size: 0.9rem;
}
.institutional-content table th,
.institutional-content table td {
    border: 1px solid var(--border-color);
    padding: 0.5rem 0.75rem;
    text-align: left;
}
.institutional-content table th {
    background: var(--bg-surface-alt);
    font-weight: 600;
}
.institutional-content .content-meta {
    margin-top: var(--space-xl);
    padding-top: var(--space-md);
    border-top: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.5rem;
    font-size: 0.8rem;
    color: var(--text-muted);
}

html.dark-mode .institutional-content {
    background: var(--bg-surface);
    border-color: var(--border-color);
}

@media (max-width: 768px) {
    .institutional-content { padding: var(--space-md); }
    .institutional-content h1 { font-size: 1.25rem; }
    .institutional-content h2 { font-size: 1.1rem; }
    .institutional-content p { font-size: 0.9rem; }
}