:root {
    /* Light Theme */
    --bg-color: #f8f9fa;
    --text-color: #333;
    --card-bg: #ffffff;
    --card-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    --primary-color: #2c7be5;
    --secondary-color: #6c757d;
    --border-color: #e9ecef;
    --hover-bg: #f8f9fa;
    --input-bg: #ffffff;
    --input-border: #ced4da;
    --tag-bg: #e9ecef;
    --tag-text: #495057;
}

[data-theme="dark"] {
    --bg-color: #1a1d21;
    --text-color: #e9ecef;
    --card-bg: #2d333b;
    --card-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    --primary-color: #4dabf7;
    --secondary-color: #adb5bd;
    --border-color: #444c56;
    --hover-bg: #2d333b;
    --input-bg: #1c2128;
    --input-border: #444c56;
    --tag-bg: #373e47;
    --tag-text: #e9ecef;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    transition: background-color 0.3s, color 0.3s;
}

.container {
    width: 100%;
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
header {
    background-color: var(--card-bg);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    padding: 1.5rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    transition: background-color 0.3s, box-shadow 0.3s;
}

.header-content {
    text-align: center;
    margin-bottom: 1rem;
}

h1 {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.subtitle {
    color: var(--secondary-color);
    font-size: 1.1rem;
}

/* Theme Toggle */
#theme-toggle {
    position: absolute;
    top: 1.5rem;
    right: 2rem;
    background: none;
    border: none;
    color: var(--text-color);
    font-size: 1.2rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 50%;
    transition: background-color 0.2s;
}

#theme-toggle:hover {
    background-color: var(--hover-bg);
}

/* Filters */
.filters {
    margin: 2rem 0;
}

.search-container {
    position: relative;
    max-width: 600px;
    margin: 0 auto 1.5rem;
}

.search-container i {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--secondary-color);
}

input[type="text"],
select {
    width: 100%;
    padding: 0.75rem 1rem 0.75rem 3rem;
    font-size: 1rem;
    border: 1px solid var(--input-border);
    border-radius: 6px;
    background-color: var(--input-bg);
    color: var(--text-color);
    transition: border-color 0.2s, box-shadow 0.2s;
}

input[type="text"]:focus,
select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(44, 123, 229, 0.25);
}

.filter-group {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    justify-content: center;
}

select {
    padding: 0.75rem 1rem;
    min-width: 180px;
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' fill='%236c757d' viewBox='0 0 16 16'%3E%3Cpath d='M7.247 11.14 2.451 5.658C1.885 5.013 2.345 4 3.204 4h9.592a1 1 0 0 1 .753 1.659l-4.796 5.48a1 1 0 0 1-1.506 0z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.75rem center;
    background-size: 16px 12px;
    padding-right: 2.5rem;
}

/* Results Count */
.results-count {
    margin-bottom: 1.5rem;
    color: var(--secondary-color);
    text-align: center;
}

/* Sources Grid */
.sources-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.source-card {
    background-color: var(--card-bg);
    border-radius: 8px;
    box-shadow: var(--card-shadow);
    overflow: hidden;
    transition: transform 0.2s, box-shadow 0.2s;
    display: flex;
    flex-direction: column;
    border: 1px solid var(--border-color);
}

.source-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.1);
}

.card-header {
    padding: 1.25rem 1.5rem 0;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.favicon {
    width: 40px;
    height: 40px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--primary-color);
    color: white;
    font-weight: bold;
    flex-shrink: 0;
}

.card-title {
    font-size: 1.25rem;
    margin: 0;
    color: var(--primary-color);
}

.card-body {
    padding: 1rem 1.5rem;
    flex-grow: 1;
}

.card-description {
    color: var(--text-color);
    margin-bottom: 1rem;
    font-size: 0.95rem;
}

.tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1.25rem;
}

.tag {
    display: inline-block;
    background-color: var(--tag-bg);
    color: var(--tag-text);
    padding: 0.25rem 0.75rem;
    border-radius: 50px;
    font-size: 0.8rem;
    font-weight: 500;
}

.card-footer {
    padding: 0 1.5rem 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.last-updated {
    font-size: 0.8rem;
    color: var(--secondary-color);
}

.btn {
    padding: 0.5rem 1rem;
    border: none;
    border-radius: 4px;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.2s, transform 0.1s;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
}

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

.btn-primary:hover {
    background-color: #1a6bd9;
    transform: translateY(-1px);
}

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

.btn-outline:hover {
    background-color: rgba(44, 123, 229, 0.1);
    transform: translateY(-1px);
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    justify-content: center;
    align-items: center;
    opacity: 0;
    transition: opacity 0.3s;
}

.modal.show {
    display: flex;
    opacity: 1;
}

.modal-content {
    background-color: var(--card-bg);
    border-radius: 8px;
    width: 90%;
    max-width: 600px;
    max-height: 90vh;
    overflow-y: auto;
    padding: 2rem;
    position: relative;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    transform: translateY(20px);
    transition: transform 0.3s;
}

.modal.show .modal-content {
    transform: translateY(0);
}

.close {
    position: absolute;
    top: 1rem;
    right: 1.5rem;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--secondary-color);
    transition: color 0.2s;
}

.close:hover {
    color: var(--text-color);
}

/* Footer */
footer {
    background-color: var(--card-bg);
    padding: 3rem 0 1.5rem;
    margin-top: 3rem;
    border-top: 1px solid var(--border-color);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

footer h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

.copyright {
    text-align: center;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
    color: var(--secondary-color);
    font-size: 0.9rem;
}

/* Responsive Design */
@media (max-width: 1200px) {
    .sources-grid {
        grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    }
}

@media (max-width: 992px) {
    .sources-grid {
        grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    }
    
    .filter-group {
        gap: 0.75rem;
    }
    
    select {
        min-width: 160px;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0 1rem;
    }
    
    h1 {
        font-size: 1.75rem;
    }
    
    .subtitle {
        font-size: 1rem;
    }
    
    .filter-group {
        flex-direction: column;
        align-items: stretch;
    }
    
    select {
        width: 100%;
    }
    
    .sources-grid {
        grid-template-columns: 1fr;
    }
    
    #theme-toggle {
        top: 1rem;
        right: 1rem;
    }
}

@media (max-width: 480px) {
    .card-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.75rem;
    }
    
    .card-actions {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
}