body[data-theme="dark"] {
    --bg-body: #1a1a2e;
    --bg-card: #2d2d44;
    --bg-card-hover: #3a3a55;
    --bg-info: #1e1e2e;
    --bg-example: #1e1e2e;
    --bg-formula: #1e1e2e;
    --text-primary: #e0e0e0;
    --text-secondary: #aaa;
    --text-dark: #e0e0e0;
    --border-light: #444;
}

body[data-theme="dark"] .lesson-card,
body[data-theme="dark"] .full-card,
body[data-theme="dark"] .feature-card,
body[data-theme="dark"] .test-card,
body[data-theme="dark"] .formula-card {
    border-bottom-color: var(--accent);
}

body[data-theme="dark"] .lesson-card a,
body[data-theme="dark"] .full-card a,
body[data-theme="dark"] .test-card a,
body[data-theme="dark"] .formula-card a {
    background: var(--accent);
    color: var(--primary-dark);
}

body[data-theme="dark"] .back-button a {
    background: var(--accent);
    color: var(--primary-dark);
}

body[data-theme="dark"] .info-box,
body[data-theme="dark"] .example-box,
body[data-theme="dark"] .formula-display {
    background: #1e1e2e;
    color: var(--text-dark);
}

body[data-theme="dark"] .lesson-container,
body[data-theme="dark"] .formula-container {
    background: transparent;
}

body[data-theme="dark"] .video-section,
body[data-theme="dark"] .content-section,
body[data-theme="dark"] .formula-section,
body[data-theme="dark"] .quiz-container {
    background: #2d2d44;
    color: #e0e0e0;
}

body[data-theme="dark"] .video-section h2,
body[data-theme="dark"] .content-section h2,
body[data-theme="dark"] .formula-section h2 {
    color: var(--accent);
}

body[data-theme="dark"] .video-section p,
body[data-theme="dark"] .content-section p,
body[data-theme="dark"] .formula-section p {
    color: #e0e0e0;
}

body[data-theme="dark"] .formula-box {
    background: #1e1e2e;
    color: #e0e0e0;
}

body[data-theme="dark"] .rule-box {
    background: #1e1e2e;
    border-right-color: var(--accent);
}

body[data-theme="dark"] .rule-box strong {
    color: var(--accent);
}

body[data-theme="dark"] .table-box {
    background: #2d2d44;
    border-color: #444;
}

body[data-theme="dark"] .table-row {
    border-bottom-color: #444;
}

body[data-theme="dark"] .table-row span {
    color: #e0e0e0;
}

body[data-theme="dark"] .lesson-header,
body[data-theme="dark"] .formula-header {
    background: linear-gradient(135deg, #2d2d44, #1a1a2e);
}

body[data-theme="dark"] .lesson-header h1,
body[data-theme="dark"] .formula-header h1,
body[data-theme="dark"] .lesson-header p,
body[data-theme="dark"] .formula-header p {
    color: var(--accent);
}

body[data-theme="dark"] .lesson-header .lesson-badge,
body[data-theme="dark"] .formula-header .formula-badge {
    background: var(--accent);
    color: #2d2d44;
}

body[data-theme="dark"] .completion-section {
    background: linear-gradient(135deg, #2d2d44, #1a1a2e);
}

body[data-theme="dark"] .completion-section h2,
body[data-theme="dark"] .completion-section p {
    color: #e0e0e0;
}

body[data-theme="dark"] .quiz-info {
    background: #1e1e2e;
    color: #e0e0e0;
}

body[data-theme="dark"] .question-box {
    background: #1e1e2e;
    border-right-color: var(--accent);
}

body[data-theme="dark"] .question-text {
    color: var(--accent);
}

body[data-theme="dark"] .option {
    background: #2d2d44;
    border-color: #555;
    color: #e0e0e0;
}

body[data-theme="dark"] .option:hover {
    background: #3a3a55;
}

body[data-theme="dark"] .option label {
    color: #e0e0e0;
}

body[data-theme="dark"] .result-modal-content {
    background: #2d2d44;
    color: #e0e0e0;
}

body[data-theme="dark"] .result-detail {
    background: #1e1e2e;
    color: #e0e0e0;
}

body[data-theme="dark"] .login-box,
body[data-theme="dark"] .contact-box {
    background: #2d2d44;
    color: #e0e0e0;
}

body[data-theme="dark"] .login-box h2,
body[data-theme="dark"] .contact-box h2,
body[data-theme="dark"] .login-box h3,
body[data-theme="dark"] .contact-box h3 {
    color: var(--accent);
}

body[data-theme="dark"] .input-group label {
    color: #e0e0e0;
}

body[data-theme="dark"] .input-group input,
body[data-theme="dark"] .contact-box input,
body[data-theme="dark"] .contact-box textarea {
    background: #1e1e2e;
    border-color: #555;
    color: #e0e0e0;
}

body[data-theme="dark"] .register-link,
body[data-theme="dark"] .contact-box p {
    color: #aaa;
}

body[data-theme="dark"] .register-link a {
    color: var(--accent);
}

body[data-theme="dark"] hr {
    border-color: #444;
}

body[data-theme="dark"] .formula-list li {
    background: #1e1e2e;
    color: #e0e0e0;
}

body[data-theme="dark"] .formula-list li strong {
    color: var(--accent);
}

body[data-theme="dark"] .lessons-header h1,
body[data-theme="dark"] .lessons-header p,
body[data-theme="dark"] .formulas-header h1,
body[data-theme="dark"] .formulas-header p,
body[data-theme="dark"] .tests-header h1,
body[data-theme="dark"] .tests-header p {
    color: #e0e0e0;
}

body[data-theme="dark"] .footer {
    background: #1a1a2e;
}