:root {
    --primary-color: #1a5cff;
    --primary-light: #eef3ff;
    --text-primary: #1e293b;
    --text-light: #94a3b8;
    --bg-light: #f8fafc;
    --bg-card: #ffffff;
    --border-light: #e2e8f0;
    --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.02);
    --radius-card: 16px;
    --radius-input: 10px;
}
.search-card {
    background: var(--bg-card);
    border-radius: var(--radius-card);
    box-shadow: var(--shadow-card);
    padding: 2rem 2rem;
    margin-bottom: 2rem;
    border: 1px solid rgba(0,0,0,0.02);
    width: 100%;
}
.search-header {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
    font-weight: 600;
    font-size: 1.1rem;
}
.search-header i {
    color: var(--primary-color);
    background: var(--primary-light);
    padding: 8px;
    border-radius: 8px;
    font-size: 1.2rem;
}
.search-wrapper {
	display: flex;
	gap: 12px;
	align-items: center;
}
.input-wrapper {
	position: relative;
	flex: 1;
}
.input-wrapper input {
	width: 100%;
	padding: 16px 50px 16px 20px;
	border: 1.5px solid var(--border-light);
	border-radius: var(--radius-input);
	font-size: 1rem;
	transition: all 0.2s;
	background: #ffffff;
	color: var(--text-primary);
	height: 50px;
}
.input-wrapper input:focus {
	outline: none;
	border-color: var(--primary-color);
	box-shadow: 0 0 0 3px rgba(26,92,255,0.1);
}
.input-wrapper input::placeholder {
	color: var(--text-light);
}

.input-wrapper .is-invalid {
    border-color: var(--error-color) !important;
    background-repeat: no-repeat;
    background-position: right calc(0.375em + 0.1875rem) center;
    background-size: calc(0.75em + 0.375rem) calc(0.75em + 0.375rem);
}

.input-wrapper .is-invalid :focus {
    border-color: var(--error-color);
    box-shadow: 0 0 0 0.25rem rgba(220, 53, 69, 0.25);
}

.search-external-btn {
	background: var(--primary-color);
	color: white;
	border: none;
	border-radius: var(--radius-input);
	padding: 0 28px;
	height: 50px;
	font-size: 1rem;
	font-weight: 500;
	display: flex;
	align-items: center;
	justify-content: center;
	gap: 8px;
	transition: all 0.2s;
	box-shadow: 0 2px 8px rgba(26,92,255,0.15);
	cursor: pointer;
	white-space: nowrap;
}
.search-external-btn i {
	font-size: 1rem;
}
.search-external-btn:hover {
	background: #1550d9;
	transform: translateY(-1px);
}
.topic-strip {
	display: flex;
	flex-wrap: wrap;
	gap: 10px;
	padding-top: 1.5rem;
}
.topic-pill {
	padding: 6px 16px;
	background: var(--bg-light);
	border-radius: 6px;
	font-size: 0.9rem;
	color: var(--text-secondary);
	cursor: pointer;
	transition: all 0.15s;
	border: 1px solid transparent;
	text-decoration:none;
}
.topic-pill:hover {
	background: var(--primary-light);
	color: var(--primary-color);
	border-color: var(--primary-light);
}
.results-card {
	background: var(--bg-card);
	border-radius: var(--radius-card);
	box-shadow: var(--shadow-card);
	padding: 2rem 2rem;
	border: 1px solid rgba(0,0,0,0.02);
	width: 100%;
}
.tab-nav {
	display: flex;
	gap: 2.5rem;
	border-bottom: 1px solid var(--border-light);
	margin-bottom: 16px;
}
.tab-item {
	padding: 0.75rem 0;
	font-weight: 500;
	color: var(--text-secondary);
	border-bottom: 2px solid transparent;
	cursor: pointer;
	display: flex;
	align-items: center;
	gap: 8px;
	margin-bottom: -1px;
}
.tab-item i {
	font-size: 1rem;
	color: var(--text-light);
}
.tab-item:hover {
	color: var(--text-primary);
}
.tab-item.active {
	color: var(--primary-color);
	border-bottom-color: var(--primary-color);
}
.tab-item.active i {
	color: var(--primary-color);
}
.tab-panel {
    display: block;
}
.tab-panel.hidden {
    display: none;
}
.filter-bar {
	display: flex;
	flex-wrap: wrap;
	align-items: center;
	gap: 2rem;
	margin-bottom: 5px;
}
.filter-group {
	display: flex;
	align-items: center;
	gap: 4px;
	flex-wrap: wrap;
}
.filter-group a{
	text-decoration: none;
}
.filter-label {
	font-size: 0.9rem;
	color: var(--text-light);
	margin-right: 8px;
}
.filter-option {
	padding: 4px 12px;
	font-size: 0.9rem;
	color: var(--text-secondary);
	cursor: pointer;
	border-radius: 6px;
	transition: all 0.1s;
}
.filter-option:hover {
	color: var(--primary-color);
	background: var(--primary-light);
}
.filter-option.active {
	color: var(--primary-color);
	font-weight: 500;
	background: var(--primary-light);
}
.list-container {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

@media (max-width: 768px) {
	.search-card, .results-card {
		padding: 1.5rem;
	}
	.search-wrapper {
		flex-direction: column;
		align-items: stretch;
	}
	.search-external-btn {
		width: 100%;
		height: 52px;
	}
	.input-wrapper input {
		height: 52px;
		padding: 14px 45px 14px 16px;
	}
	.tab-nav {
		gap: 1rem;
		overflow-x: auto;
		padding-bottom: 4px;
	}
	.tab-item {
		white-space: nowrap;
	}
	.filter-bar {
		flex-direction: column;
		align-items: flex-start;
		gap: 1rem;
	}
}

.error-message {
    color: #dc3545;
    font-size: 0.85rem;
    margin-top: 10px;
    display: none;
}

.literature-item {
	padding: 10px 2px 20px 2px;
}

.list-container {
	gap: 5px;
}