:root {
    --bg: #f4f6fb;
    --card: #ffffff;
    --text: #1a2340;
    --muted: #6b738b;
    --accent: #4f46e5;
    --accent-dark: #3d34c7;
    --border: #dbe0ef;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: Arial, sans-serif;
    color: var(--text);
    background: var(--bg);
}

body.dark {
    --bg: #111626;
    --card: #1b2235;
    --text: #edf0ff;
    --muted: #b0b9d6;
    --border: #2f3a57;
}

.container {
    width: min(1120px, 94%);
    margin: 0 auto;
}

.site-header {
    background: linear-gradient(120deg, #242a4f, #3a42a0);
    color: #ffffff; 
    padding: 20px 0;
}

.topbar {
    display: flex;
    justify-content: space-between;
    gap: 50px;
    align-items: center;
}

.brand {
    display: flex;
    align-items: center;
    gap: 4px;
}

.brand h1 {
    margin: 0;
    color: #0000CD;
    font-size: 28px;
    
}

.brand p {
    margin: 4px 0 0;
    color: #1E90FF;
}

.logo {
    width: 56px;
    height: 56px;
}

.theme-toggle {
    border: 0;
    border-radius: 10px;
    padding: 10px 14px;
    cursor: pointer;
    background: #ffffff;
    color: #1d2552;
    font-weight: bold;
}

main {
    padding: 26px 0 30px;
    display: grid;
    grid-template-columns: 320px 1fr;
    gap: 22px;
}

.filters,
.results {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 18px;
}

.filters h2,
.results h2 {
    margin-top: 0;
}

.filters-grid {
    display: grid;
    gap: 12px;
}

label {
    display: grid;
    gap: 6px;
    font-size: 14px;
    color: var(--muted);
}

input,
select,
button {
    font: inherit;
}

input,
select {
    width: 100%;
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 10px 12px;
    background: #ffffff;
}

body.dark input,
body.dark select {
    background: #12182b;
    color: var(--text);
}

.filter-actions {
    display: flex;
    gap: 10px;
    margin-top: 6px;
}

button {
    border: 0;
    border-radius: 10px;
    padding: 10px 12px;
    cursor: pointer;
    color: #ffffff;
    background: var(--accent);
}

button:hover {
    background: var(--accent-dark);
}

button.secondary {
    background: #8a92ac;
}

.results-head {
    display: flex;
    justify-content: space-between;
    gap: 12px;
    align-items: center;
}

.teacher-list {
    display: grid;
    gap: 12px;
}

.teacher-card {
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 14px;
    background: var(--card);
}

.teacher-card.empty {
    text-align: center;
    color: var(--muted);
}

.teacher-card-top {
    display: flex;
    justify-content: space-between;
    gap: 10px;
    align-items: center;
}

.teacher-card h3 {
    margin: 0;
}

.teacher-card p {
    margin: 8px 0;
}

.rating {
    color: #f59e0b;
    font-weight: bold;
}

.about {
    color: var(--muted);
}

.contact-btn {
    margin-top: 4px;
}

.sort-tools {
    margin-top: 16px;
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    align-items: center;
    color: var(--muted);
}

.site-footer {
    border-top: 1px solid var(--border);
    padding: 18px 0 30px;
    color: var(--muted);
}

@media (max-width: 900px) {
    main {
        grid-template-columns: 1fr;
    }
}