/* CSS Custom Properties */
:root {
    /* Colors - Light Gray Mode */
    --gray-1: #0a0a0a; /* text */
    --gray-2: #212121; /* text secondary */
    --gray-3: #424242; /* text muted, primary highlights */
    --gray-4: #757575; /* icons, secondary highlights */
    --gray-5: #9e9e9e; /* borders, hover states */
    --gray-6: #bdbdbd; /* elevated surfaces hover */
    --gray-7: #e0e0e0; /* surfaces elevated */
    --gray-8: #f5f5f5; /* surfaces */
    --gray-9: #e0e0e0; /* background #e9e4d7*/
    --gray-10: #ffffff; /* light background parts */

    /* New Glassmorphism-inspired variables */
    --surface-bg: rgba(255, 255, 255, 0.1);
    --surface-border: rgba(255, 255, 255, 0.2);
    --surface-blur: 20px;

    /* Pill Colors */
    --pill-bg: hsl(126.83deg 80% 45% / 30%);
  --pill-text: hsl(210, 80%, 55%);

    /* Typography */
    --font-display: "Playfair Display", serif;
    --font-body:
        "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
        sans-serif;

    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md:
        0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg:
        0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl:
        0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.25s ease;
    --transition-slow: 0.35s ease;
}

/* Reset and Base Styles */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    /* hide touches on mobile default the blue highlight */
    -webkit-tap-highlight-color: transparent;
}

html, body {
    scroll-behavior: smooth;
    font-family: var(--font-body);
    background: var(--gray-9);
    color: var(--gray-1);
    line-height: 1.6;
    font-feature-settings:
        "kern" 1,
        "liga" 1,
        "calt" 1;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
    z-index: 1;
}

.sr-only {
	position: absolute;
	width: 1px;
	height: 1px;
	padding: 0;
	margin: -1px;
	overflow: hidden;
	clip: rect(0, 0, 0, 0);
	white-space: nowrap;
	border-width: 0;
}

/* Navigation */
.top-nav {
    position: sticky;
    top: 0;
    background: var(--surface-bg);
    backdrop-filter: blur(var(--surface-blur));
    -webkit-backdrop-filter: blur(var(--surface-blur));
    border-bottom: 1px solid var(--surface-border);
    z-index: 50;
}

.nav-stats, .provider-grid, .results-grid {
    list-style: none;
    padding: 0;
    margin: 0;
}

/* Sticky Header */
.sticky-header {
    position: sticky;
    top: 0;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
    z-index: 40;
    transition: all var(--transition-normal);
    z-index: 0;
}

.sticky-header-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--space-6);
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 60px;
}

.filters-toggle-header {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-lg);
    color: var(--gray-1);
    cursor: pointer;
    font-size: 0.875rem;
    font-weight: 500;
    transition: all var(--transition-fast);
}

.filters-toggle-header:hover {
    background: rgba(255, 255, 255, 0.2);
    border-color: rgba(255, 255, 255, 0.3);
    transform: translateY(-1px);
}

.filters-toggle-header span {
    display: none;
}

@media (min-width: 768px) {
    .filters-toggle-header span {
        display: inline;
    }
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--space-6);
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}



.logo-text {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--gray-1);
}

.nav-stats {
    display: flex;
    gap: var(--space-6);
    align-items: center;
}

.stat-item {
    display: flex;
    align-items: center;
    gap: var(--space-1);
    position: relative;
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-2xl);
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(40px);
    -webkit-backdrop-filter: blur(40px);
}

.stat-number {
    font-weight: 800;
    color: var(--gray-1);
    line-height: 1;
    font-variant-numeric: tabular-nums;
    position: relative;
    z-index: 1;
}

.stat-number::before {
    content: "";
    position: absolute;
    inset: -2px;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.1), rgba(255, 255, 255, 0.05));
    border-radius: var(--radius-md);
    z-index: -1;
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.stat-item:hover .stat-number::before {
    opacity: 1;
}

.stat-label {
    font-size: 0.75rem;
    color: var(--gray-3);
    letter-spacing: 0.1em;
}

/* Hero Section */
.hero-section {
    padding: var(--space-6) 0;
    padding-bottom: 0;
    position: relative;
}


.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-6);
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
}

.hero-content {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 5vw, 4.5rem);
    font-weight: 800;
    margin-bottom: var(--space-6);
    background: linear-gradient(135deg, var(--gray-1), var(--gray-3));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.02em;
    line-height: 1.1;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--gray-2);
    line-height: 1.6;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* Search Section */
.search-section {
  padding: var(--space-4) 0;
  padding-bottom: 0;
}

.search-container {
    max-width: 600px;
    margin: 0 auto;
}

.search-input-wrapper {
    position: relative;
    background: rgba(255, 255, 255, 0.08);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border: 2px solid var(--gray-6);
    border-radius: var(--radius-2xl);
    transition: all var(--transition-normal);
    overflow: hidden;
}

.search-input-wrapper:focus-within {
    background: rgba(255, 255, 255, 0.15);
    border-color: var(--gray-4);
    border-width: 3px;
}

.search-icon {
    position: absolute;
    left: var(--space-5);
    top: 50%;
    transform: translateY(-50%);
    color: var(--gray-4);
    width: 20px;
    height: 20px;
    transition: color var(--transition-fast);
}

.search-input-wrapper:focus-within .search-icon {
    color: var(--gray-3);
}

.search-input {
    width: 100%;
    padding: var(--space-5) var(--space-5) var(--space-5) var(--space-12);
    font-size: 1.125rem;
    font-family: var(--font-body);
    font-weight: 400;
    background: transparent;
    border: none;
    color: var(--gray-1);
    outline: none;
    transition: all var(--transition-fast);
}

.search-input::placeholder {
    color: var(--gray-4);
    font-weight: 400;
    opacity: 0.8;
}

/* Main Content */
.main-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--space-6);
    z-index: -1;
}

/* .content-container { */
    /* display: grid;
    grid-template-columns: 300px 1fr;
    gap: var(--space-8);
    align-items: start;
} */

/* Filters Sidebar */
.filters-sidebar {
    /* position: sticky; */
    top: 140px; /* Adjust this value based on the height of your top-nav and sticky-header */
    overflow-y: auto;
    z-index: -1;
}

.filters-header {
    display: flex;
flex-direction: row-reverse;
}

.filters-header h3 {
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 600;
    color: var(--gray-1);
}


.filters-toggle-checkbox {
    display: none;
}

.filters-toggle {
    background: none;
    border: none;
    color: var(--gray-1);
    cursor: pointer;
    padding: var(--space-2);
    border-radius: var(--radius-md);
    transition: background-color var(--transition-fast);
}

.filters-toggle:hover {
    background-color: var(--gray-7);
}

.filters-content {
    background: var(--surface-bg);
    backdrop-filter: blur(var(--surface-blur));
    -webkit-backdrop-filter: blur(var(--surface-blur));
    border: 1px solid var(--surface-border);
    border-radius: var(--radius-xl);
    padding: var(--space-2);
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) translateY(-10px);
    z-index: 1001;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
    max-height: 80vh;
    overflow-y: auto;
    width: 360px;
    max-width: 90vw;
}

.filters-toggle-checkbox:checked ~ .filters-content {
    opacity: 1;
    visibility: visible;
    transform: translate(-50%, -50%);
}

.provider-actions {
    display: flex;
    gap: var(--space-3);
    margin-bottom: var(--space-6);
}

.action-btn {
    flex: 1;
    padding: var(--space-2) var(--space-4);
    background: var(--surface-bg);
    backdrop-filter: blur(var(--surface-blur));
    -webkit-backdrop-filter: blur(var(--surface-blur));
    border: 1px solid var(--surface-border);
    color: var(--gray-1);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.action-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    border-color: rgba(255, 255, 255, 0.3);
    transform: translateY(-1px);
}

.action-btn.secondary {
    background: rgba(255, 255, 255, 0.05);
    color: var(--gray-2);
}

.action-btn.secondary:hover {
    background: rgba(255, 255, 255, 0.15);
    color: var(--gray-1);
}

.provider-grid {
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
    gap: var(--space-3);
}

.provider-checkbox {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-2);
    background: var(--surface-bg);
    backdrop-filter: blur(var(--surface-blur));
    -webkit-backdrop-filter: blur(var(--surface-blur));
    border: 1px solid var(--surface-border);
    border-radius: var(--radius-2xl);
    cursor: pointer;
    transition: all var(--transition-fast);
}
.provider-checkbox label {
    cursor: pointer;
    user-select: none;
    display: flex;
    align-items: center;
    flex-direction: row;
    gap: var(--space-1);
}
.provider-checkbox:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.2);
    transform: translateY(-1px);
}

.checkbox-input {
    display: none;
}

.checkbox-custom {
    width: 20px;
    height: 20px;
    border: 2px solid var(--gray-6);
    border-radius: var(--radius-sm);
    position: relative;
    transition: all var(--transition-fast);
}

.checkbox-input:checked + .checkbox-custom {
    background: var(--gray-3);
    border-color: var(--gray-3);
}

.checkbox-input:checked + .checkbox-custom::after {
    content: "";
    position: absolute;
    left: 6px;
    top: 2px;
    width: 6px;
    height: 10px;
    border: solid var(--gray-9);
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

.provider-name {
    flex: 1;
    color: var(--gray-1);
    font-size: 0.875rem;
    font-weight: 500;
}

.provider-count {
    background: var(--gray-7);
    color: var(--gray-2);
    border-radius: var(--radius-lg);
    font-size: 0.75rem;
    font-weight: 600;
    min-width: 24px;
    text-align: center;
}

.provider-failed {
    background-color: rgba(239, 68, 68, 0.1);
    color: #f87171;
}

.provider-failed .provider-name {
    color: #f87171;
}

.failed-icon {
    color: #f87171;
    margin-left: auto;
}

/* Results Section */
.results-section {
    min-height: 400px;
    background-color: var(--gray-9);
}

/* Loading State */
.loading-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--space-20) 0;
    text-align: center;
}

.loading-animation {
    margin-bottom: var(--space-6);
}

.loading-dots {
    display: flex;
    gap: var(--space-2);
}

.dot {
    width: 12px;
    height: 12px;
    background: var(--gray-3);
    border-radius: 50%;
    animation: pulse 1.5s ease-in-out infinite;
}

.dot:nth-child(2) {
    animation-delay: 0.2s;
}

.dot:nth-child(3) {
    animation-delay: 0.4s;
}

@keyframes pulse {
    0%,
    100% {
        opacity: 0.3;
        transform: scale(0.8);
    }
    50% {
        opacity: 1;
        transform: scale(1.2);
    }
}

.loading-state h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--space-3);
    color: var(--gray-1);
}

.loading-state p {
    color: var(--gray-2);
    font-size: 1rem;
}

/* Error State */
.error-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--space-20) 0;
    text-align: center;
}

.error-icon {
    color: var(--gray-4);
    margin-bottom: var(--space-6);
}

.error-state h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--space-3);
    color: var(--gray-1);
}

.error-state p {
    color: var(--gray-2);
    font-size: 1rem;
    margin-bottom: var(--space-6);
}

.retry-btn {
    padding: var(--space-3) var(--space-6);
    background: var(--surface-bg);
    backdrop-filter: blur(var(--surface-blur));
    -webkit-backdrop-filter: blur(var(--surface-blur));
    border: 1px solid var(--surface-border);
    color: var(--gray-1);
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.retry-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    border-color: rgba(255, 255, 255, 0.3);
    transform: translateY(-1px);
}

/* Results Header */
.results-header {
    margin-bottom: var(--space-8);
}

.results-title {
    font-size: 1.75rem;
    font-weight: 600;
    color: var(--gray-1);
    margin-bottom: var(--space-2);
}

.search-query {
    color: var(--gray-3);
    font-weight: 500;
}

.searching-indicator {
    color: var(--gray-4);
    font-size: 1.25rem;
    font-weight: 400;
    vertical-align: middle;
}

/* Results Grid */
.results-grid {
    display: grid;
    /* background-color: var(--gray-7); */
    border-radius: inherit;
    grid-template-columns: repeat(auto-fill, minmax(400px, 1fr));
    gap: var(--space-2);
    position: relative;
}

/* Virtual Scrolling */
.scroll-sentinel {
    grid-column: 1 / -1;
    height: 20px;
    margin-top: var(--space-4);
    margin-bottom: var(--space-4);
    visibility: hidden;
}

/* Result Card */
.result-card {
    background: var(--surface-bg);
    backdrop-filter: blur(var(--surface-blur));
    -webkit-backdrop-filter: blur(var(--surface-blur));
    border: 1px solid rgb(0 0 0 / 15%) ;
    border-radius: var(--radius-xl);
    padding: var(--space-6);
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
    display: flex;
    flex-wrap: wrap;
    flex-direction: column;
    justify-content: space-between;
    overflow-wrap: break-word;
}

.result-card::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--gray-3), var(--gray-4));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition-normal);
}

.result-card:hover {
    border-color: var(--gray-6);
    background-color: var(--gray-7);
    transform: translateY(-2px);
}

/* Card Image */
.card-image {
    height: 200px;
    overflow: hidden;
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    margin: calc(var(--space-6) * -1) calc(var(--space-6) * -1) var(--space-5)
        calc(var(--space-6) * -1);
    background: var(--gray-6);
}

.card-image picture {
    width: 100%;
    height: 100%;
    display: block;
}

.card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-normal);
}

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

.card-header {
    margin-bottom: var(--space-5);
    min-width: 0;
}

.source-info {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin-bottom: var(--space-3);
}

.source-badge {
    background: var(--gray-3);
    color: var(--gray-9);
    padding: var(--space-1) var(--space-3);
    border-radius: var(--radius-md);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.025em;
}

.year-badge {
    background: var(--gray-7);
    color: var(--gray-2);
    padding: var(--space-1) var(--space-3);
    border-radius: var(--radius-md);
    font-size: 0.75rem;
    font-weight: 500;
}

.result-title {
    font-size: 1.25rem;
    font-weight: 600;
    line-height: 1.4;
    color: var(--gray-1);
    margin: 0;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
    word-break: break-word;
}

.card-body {
    margin-bottom: var(--space-5);
}

.author-section {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    margin-bottom: var(--space-4);
    color: var(--gray-2);
}

.author-section svg {
    flex-shrink: 0;
}

.author-list {
    display: inline;
}

.author-text {
    font-size: 0.875rem;
}

.expand-authors-btn {
    background: none;
    border: none;
    color: var(--gray-4);
    cursor: pointer;
    font-size: 0.875rem;
    margin-left: 4px;
    padding: 0;
}

.description-section {
    margin-bottom: var(--space-5);
}

.description-text {
    color: var(--gray-2);
    font-size: 0.9375rem;
    line-height: 1.6;
    margin-bottom: var(--space-3);
}

.description-text.line-clamp {
    display: -webkit-box;
    -webkit-line-clamp: 3;
    line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.expand-btn {
    background: none;
    border: none;
    color: var(--gray-3);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    padding: 0;
    transition: color var(--transition-fast);
}

.expand-btn:hover {
    color: var(--gray-4);
}

/* Metadata Section */
.metadata-section {
    margin-bottom: var(--space-5);
}

.metadata-pills {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
    margin-bottom: var(--space-4);
}

.pill {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    padding: var(--space-1) var(--space-3);
    border-radius: var(--radius-2xl);
    font-size: 0.75rem;
    font-weight: 500;
    border: none;
}

.type-pill {
    background-color: var(--pill-bg);
    color: var(--pill-text);
    filter: hue-rotate(60deg);
}

.publisher-pill {
    background-color: var(--pill-bg);
    color: var(--pill-text);
    filter: hue-rotate(-30deg);
}

.journal-pill {
    background-color: var(--pill-bg);
    color: var(--pill-text);
    filter: hue-rotate(110deg);
}

.access-pill.open-access {
    background-color: var(--pill-bg);
    color: var(--pill-text);
    filter: hue-rotate(-90deg);
}

.access-pill.closed-access {
    background-color: var(--pill-bg);
    color: var(--pill-text);
    filter: hue-rotate(-210deg);
}

.citation-pill {
    background-color: var(--pill-bg);
    color: var(--pill-text);
    filter: hue-rotate(-165deg);
}

.score-pill {
    background-color: var(--pill-bg);
    color: var(--pill-text);
    filter: hue-rotate(0deg);
}

/* Tags Section */
.tags-section {
    margin-top: var(--space-4);
}

.tags-container {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
}

.tag {
    background: var(--gray-7);
    color: var(--gray-2);
    padding: var(--space-1) var(--space-2);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 500;
}

/* Card Footer */
.card-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: var(--space-4);
    border-top: 1px solid var(--gray-7);
}

.footer-left {
    flex: 1;
}

.doi-info {
    font-size: 0.75rem;
    color: var(--gray-3);
}

.doi-link {
    color: var(--gray-4);
    text-decoration: none;
    font-weight: 500;
}

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

.view-link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    color: var(--gray-3);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.view-link:hover {
    background: rgba(66, 66, 66, 0.1);
    color: var(--gray-4);
    transform: translateX(2px);
}

/* Empty State */
.empty-state,
.initial-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--space-20) 0;
    text-align: center;
}

.empty-icon,
.initial-content {
    color: var(--gray-3);
    margin-bottom: var(--space-6);
}

.empty-state h3,
.initial-state h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--space-3);
    color: var(--gray-1);
}

.empty-state p,
.initial-state p {
    color: var(--gray-2);
    font-size: 1rem;
    margin-bottom: var(--space-6);
    max-width: 400px;
}

.popular-searches {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: var(--space-3);
}

.popular-label {
    color: var(--gray-3);
    font-size: 0.875rem;
}

.popular-term {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    color: var(--gray-1);
    border: 1px solid rgba(255, 255, 255, 0.15);
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.popular-term:hover {
    background: var(--gray-6);
    color: var(--gray-3);
    border-color: var(--gray-3);
}

/* Footer */
.site-footer {
    background: var(--gray-8);
    border-top: 1px solid var(--gray-7);
    padding: var(--space-16) 0 var(--space-8) 0;
    margin-top: var(--space-20);
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-6);
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-8);
}

.footer-section h4 {
    font-family: var(--font-display);
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--gray-1);
    margin-bottom: var(--space-3);
}

.footer-section p {
    color: var(--gray-2);
    line-height: 1.6;
}

.footer-bottom {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--space-8) var(--space-6) 0 var(--space-6);
    border-top: 1px solid var(--gray-7);
    text-align: center;
}

.footer-bottom p {
    color: var(--gray-3);
    font-size: 0.875rem;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .content-container {
        grid-template-columns: 1fr;
        gap: var(--space-6);
    }

}

@media (max-width: 768px) {
    .nav-container {
        padding: 0 var(--space-4);
        height: 64px;
    }

    .logo-text {
        font-size: 1.25rem;
    }

    .hero-container {
        padding: 0 var(--space-4);
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .hero-subtitle {
        font-size: 1.125rem;
    }

    .main-content {
        padding: 0 var(--space-4);
    }

    .results-grid {
        grid-template-columns: 1fr;
        gap: var(--space-4);
    }

    .result-card {
        padding: var(--space-4);
    }

    .search-icon {
        left: var(--space-4);
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .popular-searches {
        flex-direction: column;
        gap: var(--space-2);
    }

    .provider-actions {
        flex-direction: column;
    }
}

/* Utility Classes */
.md\:hidden {
    display: none;
}

.md\:block {
    display: block;
}

@media (min-width: 768px) {
    .md\:hidden {
        display: block;
    }

    .md\:block {
        display: block;
    }
}

/* Animation for cards appearing */
.result-card {
    animation: fadeInUp 0.6s ease forwards;
    opacity: 0;
    transform: translateY(20px);
}

.result-card:nth-child(1) {
    animation-delay: 0.05s;
}
.result-card:nth-child(2) {
    animation-delay: 0.1s;
}
.result-card:nth-child(3) {
    animation-delay: 0.15s;
}
.result-card:nth-child(4) {
    animation-delay: 0.2s;
}
.result-card:nth-child(5) {
    animation-delay: 0.25s;
}
.result-card:nth-child(6) {
    animation-delay: 0.3s;
}

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



/* Focus styles for accessibility */
*:focus-visible {
    outline: 2px solid var(--gray-3);
    outline-offset: 2px;
}

.search-input:focus-visible {
    outline: none;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --gray-1: #000000;
        --gray-9: #ffffff;
        --gray-7: #dcdcdc;
    }
}

/* Show More Button */
.show-more-container {
    display: flex;
    justify-content: center;
    margin-top: var(--space-8);
    margin-bottom: var(--space-8);
}

.show-more-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-4) var(--space-6);
    background: var(--surface-bg);
    backdrop-filter: blur(var(--surface-blur));
    -webkit-backdrop-filter: blur(var(--surface-blur));
    border: 1px solid var(--surface-border);
    color: var(--gray-1);
    border-radius: var(--radius-lg);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.show-more-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    border-color: rgba(255, 255, 255, 0.3);
    transform: translateY(-1px);
}

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

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* Popup Backdrop */
.filters-backdrop {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.3);
    z-index: 999;
    backdrop-filter: blur(var(--surface-blur));
    -webkit-backdrop-filter: blur(var(--surface-blur));
    transition: opacity var(--transition-normal);
}

.filters-toggle-checkbox:checked ~ .filters-backdrop {
    display: block;
}