.ots-course-list {
    display: grid;
    gap: 18px;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.ots-course-card,
.ots-course-detail,
.ots-dashboard,
.ots-checkout,
.ots-quiz,
.ots-login,
.ots-register,
.ots-my-courses,
.ots-quiz-results {
    border: 1px solid #d8dee4;
    border-radius: 8px;
    padding: 18px;
    background: #fff;
}

.ots-course-thumb img {
    display: block;
    width: 100%;
    height: auto;
    border-radius: 6px;
}

.ots-course-card h3,
.ots-course-detail h2,
.ots-dashboard h2 {
    margin-top: 0;
}

.ots-price {
    display: inline-block;
    margin-top: 8px;
    font-weight: 700;
}

.ots-button {
    display: inline-flex;
    align-items: center;
    min-height: 42px;
    padding: 0 16px;
    border-radius: 6px;
    border: 0;
    background: #125f9c;
    color: #fff;
    text-decoration: none;
    cursor: pointer;
}

.ots-button:hover,
.ots-button:focus {
    background: #0c4777;
    color: #fff;
}

.ots-notice {
    padding: 12px 14px;
    border-left: 4px solid #d63638;
    background: #fff4f4;
}

.ots-success {
    border-left-color: #008a20;
    background: #f0fff4;
}

.ots-dashboard-grid {
    display: grid;
    gap: 12px;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
}

.ots-dashboard-grid a,
.ots-row {
    display: flex;
    justify-content: space-between;
    gap: 12px;
    padding: 12px;
    border: 1px solid #d8dee4;
    border-radius: 6px;
    text-decoration: none;
}

.ots-question {
    margin: 0 0 18px;
    padding: 14px;
    border: 1px solid #d8dee4;
    border-radius: 6px;
}

.ots-question label {
    display: block;
    margin: 8px 0;
}

.ots-form {
    display: grid;
    gap: 14px;
    max-width: 520px;
}

.ots-form label,
.ots-form span,
.ots-form input,
.ots-form textarea {
    display: block;
}

.ots-form span {
    margin-bottom: 6px;
    font-weight: 700;
}

.ots-form input,
.ots-form textarea {
    width: 100%;
    min-height: 42px;
    box-sizing: border-box;
    border: 1px solid #b8c1cc;
    border-radius: 6px;
    background: #fff;
    color: #172a3d;
    padding: 8px 10px;
    font: inherit;
    opacity: 1;
    visibility: visible;
}

.ots-register-form {
    margin-top: 12px;
}

.ots-register-form .ots-field {
    display: grid;
    gap: 6px;
}

.ots-register-form .ots-field label {
    display: block;
    color: #172a3d;
    font-weight: 700;
}

.ots-register-form .ots-input,
.ots-register-form input[type="text"],
.ots-register-form input[type="email"],
.ots-register-form input[type="password"] {
    display: block !important;
    width: 100% !important;
    min-height: 46px !important;
    border: 1px solid #b8c1cc !important;
    border-radius: 6px !important;
    background: #fff !important;
    color: #172a3d !important;
    padding: 10px 12px !important;
    box-shadow: inset 0 1px 2px rgba(15, 39, 64, 0.06);
}

.ots-register-form .ots-input::placeholder,
.ots-register-form input::placeholder {
    color: #7b8797;
}

.ots-student-register .ots-register-form {
    display: block;
    max-width: 520px;
    margin-top: 12px;
}

.ots-student-register .ots-register-row {
    margin: 0 0 14px;
}

.ots-student-register .ots-register-row label {
    display: block;
    margin-bottom: 6px;
    color: #172a3d;
    font-weight: 700;
}

.ots-student-register .ots-register-row input {
    display: block;
    width: 100%;
    height: 46px;
    box-sizing: border-box;
    border: 1px solid #8ea0b5;
    border-radius: 6px;
    background: #fff;
    color: #172a3d;
    padding: 10px 12px;
    font: inherit;
}

.ots-student-register .ots-register-actions {
    margin: 18px 0 0;
}

.ots-shop-register-main {
    background: #f5f7fb;
}

.ots-shop-register-section {
    padding: 36px 0 54px;
}

.ots-shop-register-container {
    width: min(100% - 32px, 760px);
    margin: 0 auto;
}

.ots-shop-register-title {
    margin: 0 0 22px;
    color: #162235;
    font-size: 28px;
    line-height: 1.25;
    text-align: center;
    text-transform: uppercase;
}

.ots-shop-register-card {
    border: 1px solid #dde5ef;
    border-radius: 8px;
    background: #fff;
    padding: 24px;
    box-shadow: 0 8px 24px rgba(22, 34, 53, 0.08);
}

.ots-shop-register-grid {
    display: grid;
    gap: 24px;
    grid-template-columns: minmax(0, 1fr) 300px;
    align-items: start;
}

.ots-shop-register-panel {
    min-width: 0;
}

.ots-shop-register-social {
    display: grid;
    gap: 10px;
}

.ots-shop-social-button {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 44px;
    border-radius: 6px;
    font-weight: 700;
    text-decoration: none;
}

.ots-shop-social-button.is-facebook {
    color: #fff;
    background: #1877f2;
}

.ots-shop-social-button.is-google {
    border: 1px solid #c9d1d9;
    color: #172a3d;
    background: #fff;
}

.ots-shop-register-divider {
    display: flex;
    align-items: center;
    gap: 12px;
    margin: 18px 0;
    color: #6c7a8d;
    text-align: center;
}

.ots-shop-register-divider::before,
.ots-shop-register-divider::after {
    content: "";
    flex: 1;
    height: 1px;
    background: #dde5ef;
}

.ots-shop-register-form {
    display: grid;
    gap: 14px;
}

.ots-shop-register-field {
    display: grid;
    gap: 6px;
}

.ots-shop-register-field span {
    color: #172a3d;
    font-weight: 700;
}

.ots-shop-register-field input {
    width: 100%;
    height: 46px;
    box-sizing: border-box;
    border: 1px solid #c7d2df;
    border-radius: 6px;
    background: #fff;
    color: #172a3d;
    padding: 0 12px;
    font: inherit;
}

.ots-shop-register-submit {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 44px;
    border: 0;
    border-radius: 999px;
    background: #162235;
    color: #fff;
    padding: 0 22px;
    font-weight: 700;
    text-decoration: none;
    cursor: pointer;
}

.ots-shop-register-login {
    margin: 18px 0 0;
    color: #566579;
    text-align: center;
}

.ots-shop-register-benefits {
    padding: 20px;
    border: 1px solid #dde5ef;
    border-radius: 8px;
    background: #f7faff;
}

.ots-shop-register-benefits h2 {
    margin: 0 0 12px;
    color: #162235;
    font-size: 20px;
    line-height: 1.3;
}

.ots-shop-register-benefits ul {
    display: grid;
    gap: 10px;
    margin: 0;
    padding: 0;
    list-style: none;
}

.ots-shop-register-benefits li {
    position: relative;
    padding-left: 22px;
    color: #4e5f73;
}

.ots-shop-register-benefits li::before {
    content: "";
    position: absolute;
    top: 0.62em;
    left: 0;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: #125f9c;
}

@media (max-width: 760px) {
    .ots-shop-register-grid {
        grid-template-columns: 1fr;
    }
}

.ots-student-dashboard {
    display: grid;
    gap: 20px;
}

.ots-dashboard-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 20px;
    border: 1px solid #dde5ef;
    border-radius: 8px;
    background: #fff;
}

.ots-dashboard-header h2,
.ots-dashboard-header p {
    margin: 0;
}

.ots-dashboard-header p {
    color: #566579;
}

.ots-dashboard-actions {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 10px;
    margin-left: auto;
    white-space: nowrap;
}

.ots-dashboard-link {
    border: 0;
    background: transparent;
    color: #172a3d;
    font-weight: 700;
    font: inherit;
    text-decoration: none;
    cursor: pointer;
}

.ots-profile-panel {
    padding: 22px;
    border: 1px solid #dde5ef;
    border-radius: 8px;
    background: #fff;
}

.ots-profile-panel[hidden] {
    display: none;
}

.ots-profile-heading {
    margin-bottom: 16px;
}

.ots-profile-heading h3,
.ots-profile-heading p {
    margin: 0;
}

.ots-profile-heading h3 {
    color: #172a3d;
    font-size: 22px;
}

.ots-profile-heading p {
    margin-top: 4px;
    color: #566579;
}

.ots-profile-form {
    display: grid;
    gap: 14px;
    max-width: 640px;
}

.ots-profile-form label,
.ots-profile-form span,
.ots-profile-form input {
    display: block;
}

.ots-profile-form span {
    margin-bottom: 6px;
    font-weight: 700;
}

.ots-profile-form input {
    width: 100%;
    min-height: 44px;
    box-sizing: border-box;
    border: 1px solid #c7d2df;
    border-radius: 6px;
    background: #fff;
    color: #172a3d;
    padding: 0 12px;
    font: inherit;
}

.ots-profile-password {
    display: grid;
    gap: 12px;
    margin-top: 8px;
    padding: 16px;
    border-radius: 8px;
    background: #f7faff;
}

.ots-profile-password h4,
.ots-profile-password p {
    margin: 0;
}

.ots-profile-password p {
    color: #566579;
}

@media (max-width: 760px) {
    .ots-dashboard-header {
        align-items: flex-start;
        flex-direction: column;
    }

    .ots-dashboard-actions {
        justify-content: flex-start;
        margin-left: 0;
    }
}

.ots-teacher-dashboard {
    display: grid;
    gap: 20px;
}

.ots-teacher-header {
    align-items: center;
}

.ots-teacher-identity {
    display: flex;
    align-items: center;
    gap: 14px;
    min-width: 0;
}

.ots-teacher-avatar {
    flex: 0 0 72px;
    width: 72px;
    height: 72px;
}

.ots-teacher-avatar img {
    display: block;
    width: 72px;
    height: 72px;
    border-radius: 50%;
    object-fit: cover;
}

.ots-teacher-title-row {
    display: flex;
    flex-wrap: wrap;
    align-items: baseline;
    gap: 10px 14px;
}

.ots-teacher-profile-toggle {
    padding: 0;
    color: #125f9c;
}

.ots-teacher-panel {
    padding: 20px;
    border: 1px solid #dde5ef;
    border-radius: 8px;
    background: #fff;
}

.ots-teacher-panel h3 {
    margin: 0 0 14px;
    color: #172a3d;
    font-size: 20px;
}

.ots-teacher-toggle-panel {
    padding: 0;
    overflow: hidden;
}

.ots-teacher-create-button {
    flex: 0 0 auto;
    margin-left: auto;
    border: 0;
}

.ots-teacher-toggle-panel .ots-teacher-form {
    padding: 20px;
}

.ots-teacher-toggle-button {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 44px;
    border-radius: 8px;
    background: #125f9c;
    color: #fff;
    padding: 0 18px;
    font-weight: 700;
    cursor: pointer;
    list-style: none;
}

.ots-teacher-toggle-button::-webkit-details-marker {
    display: none;
}

.ots-teacher-toggle-button::after {
    content: "+";
    margin-left: 10px;
    font-size: 20px;
    line-height: 1;
}

details[open] > .ots-teacher-toggle-button::after {
    content: "-";
}

.ots-teacher-create-button.is-open::after,
.ots-teacher-create-button[aria-expanded="true"]::after {
    content: "-";
}

.ots-teacher-toggle-button.is-small {
    justify-content: flex-start;
    min-height: 40px;
    border-radius: 6px;
    background: #162235;
}

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

.ots-teacher-form label,
.ots-teacher-form span,
.ots-teacher-form input,
.ots-teacher-form textarea,
.ots-teacher-form select {
    display: block;
    width: 100%;
}

.ots-teacher-form span {
    margin-bottom: 6px;
    font-weight: 700;
}

.ots-teacher-form input,
.ots-teacher-form textarea,
.ots-teacher-form select {
    box-sizing: border-box;
    border: 1px solid #c7d2df;
    border-radius: 6px;
    background: #fff;
    color: #172a3d;
    padding: 10px 12px;
    font: inherit;
}

.ots-teacher-form-grid,
.ots-teacher-lists {
    display: grid;
    gap: 12px;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
}

.ots-teacher-list {
    padding: 14px;
    border: 1px solid #dde5ef;
    border-radius: 8px;
    background: #f7faff;
}

.ots-teacher-list h4 {
    margin: 0 0 10px;
}

.ots-teacher-list article {
    display: flex;
    justify-content: space-between;
    gap: 12px;
    padding: 8px 0;
    border-top: 1px solid #dde5ef;
}

.ots-teacher-courses {
    display: grid;
    gap: 16px;
}

.ots-teacher-courses h3 {
    margin: 0;
}

.ots-teacher-empty,
.ots-teacher-course-card {
    border: 1px solid #dde5ef;
    border-radius: 8px;
    background: #fff;
    padding: 18px;
}

.ots-teacher-course-head {
    display: flex;
    gap: 14px;
    align-items: flex-start;
}

.ots-teacher-course-thumb img {
    width: 88px;
    height: 88px;
    border-radius: 8px;
    object-fit: cover;
}

.ots-teacher-course-head h4,
.ots-teacher-course-head p {
    margin: 0;
}

.ots-teacher-course-head p {
    color: #566579;
}

.ots-teacher-course-head span,
.ots-teacher-lesson-item span {
    display: inline-block;
    margin-top: 6px;
    color: #6b7788;
    font-size: 13px;
}

.ots-teacher-course-actions {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    margin-top: 14px;
}

.ots-teacher-action-note {
    color: #566579;
}

.ots-teacher-course-action-buttons {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: flex-end;
    gap: 8px;
    margin-left: auto;
}

.ots-teacher-delete-form {
    margin: 0;
}

.ots-edit-button,
.ots-delete-button {
    min-height: 36px;
    border-radius: 6px;
    background: #fff;
    padding: 0 12px;
    font-weight: 700;
    cursor: pointer;
}

.ots-edit-button {
    border: 1px solid #125f9c;
    color: #125f9c;
}

.ots-delete-button {
    border: 1px solid #d63638;
    color: #b42318;
}

.ots-edit-button:hover,
.ots-edit-button:focus {
    background: #eff7ff;
}

.ots-delete-button:hover,
.ots-delete-button:focus {
    background: #fff4f4;
}

.ots-teacher-course-body {
    display: grid;
    gap: 10px;
    margin-top: 18px;
    padding-top: 16px;
    border-top: 1px solid #dde5ef;
}

.ots-teacher-course-body h5,
.ots-teacher-nested-panel h5 {
    margin: 0;
    color: #172a3d;
    font-size: 16px;
}

.ots-teacher-nested-panel {
    margin-top: 14px;
    padding: 16px;
    border: 1px solid #dde5ef;
    border-radius: 8px;
    background: #f7faff;
}

.ots-teacher-nested-panel .ots-teacher-form {
    margin-top: 14px;
}

.ots-teacher-lesson-item,
.ots-teacher-quiz-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 12px;
    border: 1px solid #dde5ef;
    border-radius: 8px;
    background: #fff;
}

.ots-teacher-quiz-row {
    justify-content: space-between;
    color: #566579;
}

@media (max-width: 760px) {
    .ots-teacher-header {
        align-items: stretch;
    }

    .ots-teacher-identity {
        align-items: flex-start;
    }

    .ots-teacher-create-button {
        width: 100%;
        margin-left: 0;
    }

    .ots-teacher-course-head,
    .ots-teacher-lesson-item {
        align-items: stretch;
        flex-direction: column;
    }
}

.ots-checkbox {
    display: flex;
    align-items: center;
    gap: 8px;
}

.ots-checkbox input {
    width: auto;
    min-height: 0;
}

.ots-checkbox span {
    margin: 0;
    font-weight: 400;
}

.ots-social-login {
    display: grid;
    gap: 10px;
    max-width: 520px;
    margin-top: 22px;
}

.ots-social-login p {
    margin: 0;
    font-weight: 700;
}

.ots-social-button {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 44px;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 700;
}

.ots-google {
    border: 1px solid #c9d1d9;
    color: #18212f;
    background: #fff;
}

.ots-facebook {
    color: #fff;
    background: #1877f2;
}

.ots-student-auth-page {
    padding: 38px 16px;
    background: #eef3f8;
    color: #172a3d;
}

.ots-student-auth-box,
.ots-student-register-box {
    max-width: 520px;
    margin: 0 auto;
    border: 1px solid #d8e2ee;
    border-radius: 8px;
    background: #fff;
    box-shadow: 0 8px 22px rgba(15, 39, 64, 0.08);
}

.ots-student-auth-box {
    padding: 22px;
}

.ots-student-register-box {
    margin-top: 14px;
    padding: 18px;
}

.ots-student-auth-box h1,
.ots-student-register-box h2 {
    margin: 0 0 10px;
    color: #0f2740;
}

.ots-student-auth-box h1 {
    font-size: 24px;
}

.ots-student-register-box h2 {
    font-size: 18px;
}

.ots-student-auth-intro,
.ots-student-register-box p,
.ots-auth-switch {
    color: #50677e;
}

.ots-student-social {
    display: grid;
    gap: 10px;
    margin: 16px 0;
}

.ots-auth-divider {
    display: flex;
    align-items: center;
    gap: 12px;
    margin: 16px 0;
    color: #50677e;
    text-align: center;
}

.ots-auth-divider::before,
.ots-auth-divider::after {
    content: "";
    flex: 1;
    height: 1px;
    background: #d8e2ee;
}

.ots-student-login-form {
    max-width: none;
}

.ots-student-auth-actions {
    margin-top: 18px;
    text-align: center;
}

.ots-auth-switch {
    margin: 18px 0 0;
    text-align: center;
}