@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

:root {
    /* Light Theme (Default) */
    --background: #ffffff;
    --surface: #fafafa;
    --surface-hover: #f4f4f5;
    --text: #09090b;
    --text-muted: #71717a;
    --border: #e4e4e7;
    --primary: #18181b;
    --primary-hover: #27272a;
    --primary-text: #ffffff;
    --success: #10b981;
    --success-bg: #d1fae5;
    --warning: #f59e0b;
    --warning-bg: #fef3c7;
    --danger: #ef4444;
    --danger-bg: #fee2e2;
    --accent: #2563eb;
    --accent-hover: #1d4ed8;
    --accent-bg: #dbeafe;
    
    --radius-sm: 4px;
    --radius: 8px;
    --radius-lg: 12px;
    --radius-full: 9999px;
    
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    
    --transition: 0.2s ease-in-out;
}

[data-theme="dark"] {
    --background: #09090b;
    --surface: #18181b;
    --surface-hover: #27272a;
    --text: #fafafa;
    --text-muted: #a1a1aa;
    --border: #27272a;
    --primary: #fafafa;
    --primary-hover: #e4e4e7;
    --primary-text: #18181b;
    
    --success: #10b981;
    --success-bg: rgba(16, 185, 129, 0.2);
    --warning: #f59e0b;
    --warning-bg: rgba(245, 158, 11, 0.2);
    --danger: #ef4444;
    --danger-bg: rgba(239, 68, 68, 0.2);
    --accent: #3b82f6;
    --accent-hover: #60a5fa;
    --accent-bg: rgba(59, 130, 246, 0.2);
    
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.5);
    --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.5);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--background);
    color: var(--text);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    transition: background-color var(--transition), color var(--transition);
}

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

/* LAYOUT */
.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* HEADER */
.header {
    background-color: var(--background);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 50;
    padding: 1rem 0;
}
.header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 2rem;
}
.header-logo {
    font-weight: 700;
    font-size: 1.25rem;
    letter-spacing: -0.025em;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.header-nav {
    display: flex;
    gap: 1.5rem;
    align-items: center;
}
.header-nav a {
    color: var(--text-muted);
    font-weight: 500;
    font-size: 0.875rem;
}
.header-nav a:hover {
    color: var(--text);
}
.header-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}
.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: var(--text);
    cursor: pointer;
    font-size: 1.5rem;
}

/* BUTTONS */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
    font-weight: 500;
    border-radius: var(--radius);
    border: 1px solid transparent;
    cursor: pointer;
    transition: all var(--transition);
    gap: 0.5rem;
}
.btn-primary {
    background-color: var(--primary);
    color: var(--primary-text);
}
.btn-primary:hover {
    background-color: var(--primary-hover);
}
.btn-outline {
    background-color: transparent;
    border-color: var(--border);
    color: var(--text);
}
.btn-outline:hover {
    background-color: var(--surface-hover);
}
.btn-accent {
    background-color: var(--accent);
    color: #fff;
}
.btn-accent:hover {
    background-color: var(--accent-hover);
}
.btn-icon {
    padding: 0.5rem;
}

/* FORMS & INPUTS */
.form-group {
    margin-bottom: 1rem;
}
.form-label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
    color: var(--text);
}
.form-control {
    width: 100%;
    padding: 0.5rem 0.75rem;
    font-family: inherit;
    font-size: 0.875rem;
    background-color: var(--background);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text);
    transition: border-color var(--transition);
}
.form-control:focus {
    outline: none;
    border-color: var(--accent);
}
.search-box {
    position: relative;
    width: 100%;
    max-width: 400px;
}
.search-box input {
    padding-left: 2.5rem;
    border-radius: var(--radius-full);
}
.search-box svg {
    position: absolute;
    left: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    width: 1rem;
    height: 1rem;
}

/* CARDS */
.card {
    background-color: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    transition: border-color var(--transition), box-shadow var(--transition);
}
.card:hover {
    border-color: var(--border);
    box-shadow: var(--shadow-sm);
}

/* PROVIDER CARD */
.provider-card {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    height: 100%;
}
.provider-card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
}
.provider-logo-group {
    display: flex;
    align-items: center;
    gap: 1rem;
}
.provider-logo {
    width: 48px;
    height: 48px;
    border-radius: var(--radius);
    object-fit: cover;
    background-color: var(--background);
    border: 1px solid var(--border);
}
.provider-meta h3 {
    font-size: 1.125rem;
    font-weight: 600;
    letter-spacing: -0.025em;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.provider-meta a {
    color: var(--text-muted);
    font-size: 0.875rem;
}
.provider-description {
    font-size: 0.875rem;
    color: var(--text-muted);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    line-height: 1.6;
}
.provider-models {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}
.provider-footer {
    margin-top: auto;
    padding-top: 1rem;
    border-top: 1px dashed var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.provider-price {
    font-size: 0.875rem;
    color: var(--text-muted);
}
.provider-price strong {
    color: var(--text);
    font-size: 1.125rem;
    font-weight: 600;
}

/* BADGES */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 0.125rem 0.5rem;
    font-size: 0.75rem;
    font-weight: 500;
    border-radius: var(--radius-full);
    background-color: var(--surface-hover);
    color: var(--text);
}
.badge-verified {
    background-color: var(--success-bg);
    color: var(--success);
    gap: 0.25rem;
}
.badge-category {
    background-color: var(--accent-bg);
    color: var(--accent);
}

/* RATING STARS */
.rating-stars {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    color: var(--warning);
}
.rating-stars svg {
    width: 1rem;
    height: 1rem;
}
.rating-count {
    color: var(--text-muted);
    font-size: 0.875rem;
    margin-left: 0.25rem;
}

/* PAGINATION */
.pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.25rem;
    margin-top: 2rem;
}
.pagination .page-item {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2rem;
    height: 2rem;
    border-radius: var(--radius);
    font-size: 0.875rem;
    color: var(--text-muted);
}
.pagination .page-item:hover {
    background-color: var(--surface-hover);
    color: var(--text);
}
.pagination .page-item.active {
    background-color: var(--primary);
    color: var(--primary-text);
}

/* MODAL */
.modal-backdrop {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition);
}
.modal-backdrop.show {
    opacity: 1;
    pointer-events: auto;
}
.modal {
    background-color: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    width: 100%;
    max-width: 500px;
    padding: 1.5rem;
    box-shadow: var(--shadow-lg);
    transform: scale(0.95);
    transition: transform var(--transition);
}
.modal-backdrop.show .modal {
    transform: scale(1);
}
.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}
.modal-title {
    font-size: 1.25rem;
    font-weight: 600;
}
.modal-close {
    background: none; border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 1.25rem;
}

/* TOAST */
.toast-container {
    position: fixed;
    bottom: 1.5rem;
    right: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    z-index: 150;
}
.toast {
    background-color: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1rem;
    box-shadow: var(--shadow);
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    transform: translateY(100%);
    opacity: 0;
    transition: all var(--transition);
}
.toast.show {
    transform: translateY(0);
    opacity: 1;
}
.toast-icon.success { color: var(--success); }
.toast-icon.error { color: var(--danger); }

/* BREADCRUMB */
.breadcrumb {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    color: var(--text-muted);
}
.breadcrumb a:hover { color: var(--text); }
.breadcrumb-separator { color: var(--border); }

/* EMPTY STATE */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 4rem 1.5rem;
    border: 1px dashed var(--border);
    border-radius: var(--radius-lg);
    background-color: var(--surface);
}
.empty-state-icon {
    width: 3rem; height: 3rem;
    color: var(--text-muted);
    margin-bottom: 1rem;
}
.empty-state-title {
    font-size: 1.125rem; font-weight: 600; margin-bottom: 0.5rem;
}
.empty-state-desc {
    color: var(--text-muted); font-size: 0.875rem; margin-bottom: 1.5rem;
}

/* SKELETON */
.skeleton {
    background-color: var(--surface-hover);
    border-radius: var(--radius-sm);
    animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}
@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: .5; }
}

/* DROPDOWN */
.dropdown {
    position: relative;
    display: inline-block;
}
.dropdown-menu {
    position: absolute;
    top: 100%; right: 0;
    margin-top: 0.5rem;
    background-color: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    min-width: 200px;
    z-index: 60;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all var(--transition);
}
.dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}
.dropdown-item {
    display: block;
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
    color: var(--text);
}
.dropdown-item:hover {
    background-color: var(--surface-hover);
}

/* FILTER SIDEBAR */
.filter-sidebar {
    background-color: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
}
.filter-group {
    margin-bottom: 1.5rem;
}
.filter-group-title {
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: var(--text);
}
.filter-checkbox {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
    cursor: pointer;
}
.filter-checkbox input[type="checkbox"] {
    appearance: none;
    width: 1rem; height: 1rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background-color: var(--background);
    cursor: pointer;
    position: relative;
}
.filter-checkbox input[type="checkbox"]:checked {
    background-color: var(--accent);
    border-color: var(--accent);
}
.filter-checkbox input[type="checkbox"]:checked::after {
    content: '';
    position: absolute;
    left: 4px; top: 1px;
    width: 4px; height: 8px;
    border: solid white;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}
.filter-checkbox:hover { color: var(--text); }

/* FOOTER */
.footer {
    background-color: var(--surface);
    border-top: 1px solid var(--border);
    padding: 4rem 0 2rem;
    margin-top: 4rem;
}
.footer-grid {
    display: grid;
    grid-template-columns: repeat(1, 1fr);
    gap: 3rem;
    margin-bottom: 3rem;
}
@media (min-width: 768px) {
    .footer-grid { grid-template-columns: 2fr 1fr 1fr 1fr; }
}
.footer-brand h3 {
    font-size: 1.25rem; font-weight: 700; margin-bottom: 0.5rem;
}
.footer-brand p {
    color: var(--text-muted); font-size: 0.875rem;
}
.footer-links h4 {
    font-size: 0.875rem; font-weight: 600; margin-bottom: 1rem;
}
.footer-links ul {
    list-style: none; display: flex; flex-direction: column; gap: 0.75rem;
}
.footer-links a {
    color: var(--text-muted); font-size: 0.875rem;
}
.footer-links a:hover { color: var(--text); }
.footer-bottom {
    border-top: 1px solid var(--border);
    padding-top: 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--text-muted);
    font-size: 0.875rem;
}

/* RESPONSIVE DESIGN UTILITIES */
@media (max-width: 768px) {
    .header-nav, .header-search, .header-actions { display: none; }
    .mobile-menu-btn { display: block; }
}

/* GRID HELPERS */
.grid { display: grid; }
.gap-4 { gap: 1rem; }
.gap-6 { gap: 1.5rem; }
.grid-cols-1 { grid-template-columns: repeat(1, minmax(0, 1fr)); }
@media (min-width: 768px) {
    .md\:grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .md\:grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}
@media (min-width: 1024px) {
    .lg\:grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .lg\:grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}