:root {
    --bg-color: #f4f4f5;
    --text-color: #18181b;
    --card-bg: #ffffff;
    --card-border: #e4e4e7;
    --accent-color: #3b82f6;
    --accent-hover: #2563eb;
    --badge-bg: #e0e7ff;
    --badge-text: #3730a3;
    --tag-bg: #f3f4f6;
    --tag-text: #374151;
    --tag-active-bg: #3b82f6;
    --tag-active-text: #ffffff;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg-color: #09090b;
        --text-color: #fafafa;
        --card-bg: #18181b;
        --card-border: #27272a;
        --accent-color: #60a5fa;
        --accent-hover: #93c5fd;
        --badge-bg: #1e3a8a;
        --badge-text: #bfdbfe;
        --tag-bg: #27272a;
        --tag-text: #d1d5db;
        --tag-active-bg: #60a5fa;
        --tag-active-text: #0f172a;
    }
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    padding: 0;
    line-height: 1.6;
    transition: background-color 0.3s, color 0.3s;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 2.5rem 2rem 1.5rem;
    max-width: 900px;
    margin: 0 auto;
}

h1 {
    margin: 0;
    font-size: 1.8rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.lang-switcher {
    display: flex;
    gap: 0.5rem;
}

.lang-switcher button {
    background: var(--tag-bg);
    border: 1px solid var(--card-border);
    color: var(--text-color);
    cursor: pointer;
    font-size: 0.85rem;
    padding: 0.4rem 0.8rem;
    border-radius: 6px;
    font-weight: 500;
    transition: all 0.2s;
}

.lang-switcher button:hover {
    background-color: var(--card-border);
}

.lang-switcher button.active {
    background-color: var(--accent-color);
    color: var(--tag-active-text);
    border-color: var(--accent-color);
}

main {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 2rem 3rem;
}

.search-filter-section {
    margin-bottom: 2.5rem;
    display: flex;
    flex-direction: column;
    gap: 1.2rem;
}

#search-input {
    width: 100%;
    padding: 1rem 1.2rem;
    font-size: 1rem;
    border-radius: 12px;
    border: 1px solid var(--card-border);
    background-color: var(--card-bg);
    color: var(--text-color);
    box-sizing: border-box;
    box-shadow: 0 2px 4px rgba(0,0,0,0.02);
    transition: border-color 0.2s, box-shadow 0.2s;
    outline: none;
}

#search-input:focus {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

.tags-filter {
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem;
}

.tag-btn {
    background: var(--tag-bg);
    color: var(--tag-text);
    border: 1px solid var(--card-border);
    padding: 0.4rem 1rem;
    border-radius: 20px;
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.2s;
}

.tag-btn:hover {
    background: var(--card-border);
}

.tag-btn.active {
    background: var(--tag-active-bg);
    color: var(--tag-active-text);
    border-color: var(--tag-active-bg);
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 1.8rem;
}

.card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 16px;
    padding: 1.8rem;
    text-decoration: none;
    color: inherit;
    transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s;
    display: flex;
    flex-direction: column;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    border-color: var(--accent-color);
}

.card h2 {
    margin: 0 0 0.8rem 0;
    font-size: 1.3rem;
    font-weight: 600;
}

.card p {
    margin: 0 0 1.5rem 0;
    font-size: 0.95rem;
    opacity: 0.8;
    flex-grow: 1;
}

.card-footer {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    gap: 1rem;
}

.badges {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.badge-lang {
    background: var(--badge-bg);
    color: var(--badge-text);
    padding: 0.2rem 0.6rem;
    border-radius: 6px;
    font-size: 0.75rem;
    font-weight: 600;
}

.badge-tag {
    background: var(--tag-bg);
    color: var(--tag-text);
    padding: 0.2rem 0.6rem;
    border-radius: 6px;
    font-size: 0.75rem;
}