.cn-teacher-page {
    --cn-primary: #2948e8;
    --cn-primary-soft: #eef3ff;
    --cn-text: #17203b;
    --cn-muted: #6b7488;
    --cn-border: #dfe6f2;
    --cn-bg: #f6f8fc;
    --cn-card: #ffffff;
    --cn-shadow: 0 20px 60px rgba(15, 23, 42, .08);
    color: var(--cn-text);
    background: var(--cn-bg);
    font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.cn-teacher-page * {
    box-sizing: border-box;
}

.cn-teacher-shell {
    display: grid;
    grid-template-columns: 282px minmax(0, 1fr);
    gap: 26px;
    width: min(100%, 1440px);
    margin: 0 auto;
    padding: 28px 22px 54px;
}

.cn-teacher-sidebar {
    position: sticky;
    top: 18px;
    align-self: start;
    display: grid;
    gap: 16px;
}

.cn-teacher-mini-card,
.cn-teacher-nav,
.cn-teacher-hero,
.cn-teacher-panel,
.cn-about-card,
.cn-contact-card {
    border: 1px solid var(--cn-border);
    border-radius: 18px;
    background: var(--cn-card);
    box-shadow: 0 10px 28px rgba(15, 23, 42, .05);
}

.cn-teacher-mini-card {
    display: grid;
    gap: 14px;
    padding: 18px;
}

.cn-teacher-avatar {
    width: 88px;
    height: 88px;
    border: 5px solid #eef3ff;
    border-radius: 999px;
    object-fit: cover;
}

.cn-teacher-kicker {
    margin: 0 0 5px;
    color: var(--cn-primary);
    font-size: 12px;
    font-weight: 800;
    letter-spacing: .08em;
    text-transform: uppercase;
}

.cn-teacher-mini-card h1 {
    margin: 0 0 4px;
    color: var(--cn-text);
    font-size: 24px;
    line-height: 1.15;
}

.cn-teacher-nickname {
    display: block;
    color: var(--cn-muted);
    font-size: 14px;
    font-weight: 700;
}

.cn-social-links-mini-card {
    margin-top: 13px;
}

.cn-social-links-mini-card .cn-social-list {
    gap: 8px;
}

.cn-social-links-mini-card .cn-social-list a {
    width: 34px;
    height: 34px;
    min-height: 0;
    padding: 0;
    border: 0;
    border-radius: 9px;
    color: #667085;
    background: var(--cn-primary-soft);
}

.cn-social-links-mini-card .cn-social-list a:hover {
    color: var(--cn-primary);
    border-color: transparent;
    background: #e3eaff;
}

.cn-social-icon {
    display: inline-flex;
    flex: 0 0 25px;
    width: 25px;
    height: 25px;
    align-items: center;
    justify-content: center;
    color: inherit;
    line-height: 1;
}

.cn-social-icon .cn-social-svg {
    display: block;
    width: 25px;
    height: 25px;
    overflow: visible;
}

.cn-social-links-mini-card .cn-social-label {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.cn-social-links {
    min-width: 0;
}

.cn-social-links-sidebar {
    padding: 14px;
    border: 1px solid var(--cn-border);
    border-radius: 16px;
    background: var(--cn-card);
    box-shadow: 0 10px 28px rgba(15, 23, 42, .05);
}

.cn-social-title {
    display: block;
    margin-bottom: 10px;
    color: var(--cn-text);
    font-size: 13px;
    font-weight: 900;
}

.cn-social-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.cn-social-list a {
    display: inline-flex;
    min-height: 38px;
    align-items: center;
    justify-content: center;
    gap: 7px;
    padding: 8px 10px;
    border: 1px solid var(--cn-border);
    border-radius: 11px;
    color: var(--cn-primary);
    background: #ffffff;
    font-size: 12px;
    font-weight: 800;
    text-decoration: none;
    transition: transform .18s ease, border-color .18s ease, background .18s ease;
}

.cn-social-list a:hover {
    color: var(--cn-primary);
    border-color: #bcc9f7;
    background: var(--cn-primary-soft);
    transform: translateY(-1px);
}

.cn-social-links-sidebar .cn-social-list a {
    width: 38px;
    padding: 8px;
}

.cn-social-links-sidebar .cn-social-label {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.cn-social-links-about {
    margin-top: 18px;
}

.cn-teacher-nav {
    display: grid;
    gap: 6px;
    padding: 10px;
}

.cn-teacher-nav-btn {
    width: 100%;
    min-height: 44px;
    padding: 10px 12px;
    border: 0;
    border-radius: 12px;
    color: #536076;
    background: transparent;
    font: inherit;
    font-size: 14px;
    font-weight: 800;
    text-align: left;
    cursor: pointer;
}

.cn-teacher-nav-btn:hover,
.cn-teacher-nav-btn.is-active {
    color: var(--cn-primary);
    background: var(--cn-primary-soft);
}

.cn-teacher-dashboard-link {
    display: inline-flex;
    min-height: 46px;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 11px 16px;
    border-radius: 13px;
    color: #ffffff;
    background: var(--cn-primary);
    box-shadow: 0 10px 24px rgba(41, 72, 232, .2);
    font-size: 14px;
    font-weight: 800;
    text-decoration: none;
}

.cn-teacher-dashboard-link:hover {
    color: #ffffff;
    transform: translateY(-1px);
}

.material-symbols-rounded {
    font-family: "Material Symbols Rounded";
    font-size: 20px;
    font-style: normal;
    font-weight: 500;
    line-height: 1;
    letter-spacing: normal;
    text-transform: none;
    white-space: nowrap;
    word-wrap: normal;
    direction: ltr;
    -webkit-font-feature-settings: "liga";
    -webkit-font-smoothing: antialiased;
    font-feature-settings: "liga";
}

.cn-teacher-main {
    min-width: 0;
}

.cn-teacher-banner {
    position: relative;
    min-height: 310px;
    margin-bottom: 18px;
    overflow: hidden;
    border: 1px solid var(--cn-border);
    border-radius: 26px;
    background: linear-gradient(135deg, #2948e8, #6ea8ff);
    box-shadow: var(--cn-shadow);
}

.cn-teacher-slides,
.cn-teacher-slide {
    position: absolute;
    inset: 0;
}

.cn-teacher-slide {
    margin: 0;
    opacity: 0;
    transition: opacity .25s ease;
}

.cn-teacher-slide.is-active {
    opacity: 1;
}

.cn-teacher-slide img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.cn-teacher-banner-fallback {
    display: grid;
    align-content: center;
    min-height: 310px;
    padding: 36px;
    color: #ffffff;
}

.cn-teacher-banner-fallback span {
    font-size: 13px;
    font-weight: 800;
    letter-spacing: .12em;
    text-transform: uppercase;
}

.cn-teacher-banner-fallback strong {
    margin-top: 8px;
    font-size: clamp(32px, 5vw, 58px);
    line-height: 1.05;
}

.cn-teacher-banner-fallback p {
    max-width: 520px;
    margin: 12px 0 0;
    color: rgba(255, 255, 255, .82);
    font-size: 16px;
}

.cn-slider-btn {
    position: absolute;
    top: 50%;
    z-index: 3;
    width: 42px;
    height: 42px;
    border: 0;
    border-radius: 999px;
    color: var(--cn-text);
    background: rgba(255, 255, 255, .88);
    box-shadow: 0 10px 26px rgba(15, 23, 42, .16);
    transform: translateY(-50%);
    cursor: pointer;
    font-size: 30px;
    line-height: 1;
}

.cn-slider-prev {
    left: 16px;
}

.cn-slider-next {
    right: 16px;
}

.cn-slider-dots {
    position: absolute;
    right: 22px;
    bottom: 18px;
    z-index: 4;
    display: flex;
    gap: 8px;
}

.cn-slider-dots button {
    width: 9px;
    height: 9px;
    padding: 0;
    border: 0;
    border-radius: 999px;
    background: rgba(255, 255, 255, .62);
    cursor: pointer;
}

.cn-slider-dots button.is-active {
    width: 22px;
    background: #ffffff;
}

.cn-teacher-hero {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 22px;
    margin-bottom: 18px;
    padding: 24px;
}

.cn-teacher-hero h2 {
    margin: 0 0 8px;
    color: var(--cn-text);
    font-size: clamp(28px, 4vw, 42px);
    line-height: 1.05;
}

.cn-teacher-hero p {
    max-width: 720px;
    margin: 0;
    color: var(--cn-muted);
    font-size: 16px;
    line-height: 1.65;
}

.cn-teacher-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 16px;
}

.cn-teacher-chips span {
    display: inline-flex;
    min-height: 36px;
    align-items: center;
    padding: 8px 13px;
    border: 1px solid #cfd8ff;
    border-radius: 999px;
    color: var(--cn-primary);
    background: var(--cn-primary-soft);
    font-size: 13px;
    font-weight: 800;
}

.cn-teacher-stats {
    display: grid;
    grid-template-columns: repeat(3, minmax(112px, 1fr));
    gap: 10px;
    align-self: center;
}

.cn-teacher-stat {
    padding: 14px;
    border: 1px solid var(--cn-border);
    border-radius: 14px;
    background: #fbfcff;
}

.cn-teacher-stat strong {
    display: block;
    color: var(--cn-text);
    font-size: 19px;
    line-height: 1.2;
}

.cn-teacher-stat span {
    color: var(--cn-muted);
    font-size: 12px;
    font-weight: 700;
}

.cn-teacher-panel {
    display: none;
    padding: 24px;
}

.cn-teacher-panel.is-active {
    display: block;
}

.cn-section-heading {
    margin-bottom: 18px;
}

.cn-section-heading h3 {
    margin: 0 0 6px;
    color: var(--cn-text);
    font-size: 24px;
}

.cn-section-heading p {
    margin: 0;
    color: var(--cn-muted);
}

.cn-course-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
}

.cn-course-card,
.cn-post-card {
    overflow: hidden;
    border: 1px solid var(--cn-border);
    border-radius: 16px;
    background: #ffffff;
    box-shadow: 0 10px 24px rgba(15, 23, 42, .04);
}

.cn-course-thumb {
    position: relative;
    display: block;
    aspect-ratio: 16 / 9;
    overflow: hidden;
    background: linear-gradient(135deg, #ecf2ff, #dbe6ff);
    text-decoration: none;
}

.cn-course-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform .25s ease;
}

.cn-course-card:hover .cn-course-thumb img {
    transform: scale(1.04);
}

.cn-course-thumb span {
    position: absolute;
    inset: 0;
    display: grid;
    place-items: center;
    color: #536076;
    font-weight: 800;
}

.cn-course-thumb em {
    position: absolute;
    left: 12px;
    bottom: 12px;
    padding: 6px 10px;
    border-radius: 999px;
    color: #ffffff;
    background: rgba(41, 72, 232, .92);
    font-size: 12px;
    font-style: normal;
    font-weight: 800;
}

.cn-course-body {
    padding: 14px;
}

.cn-course-body h4,
.cn-post-card h4 {
    margin: 0 0 8px;
    color: var(--cn-text);
    font-size: 17px;
    line-height: 1.35;
}

.cn-course-body h4 a,
.cn-post-card h4 a,
.cn-post-card > a {
    color: inherit;
    text-decoration: none;
}

.cn-course-body p,
.cn-post-card p {
    margin: 0 0 12px;
    color: var(--cn-muted);
    font-size: 14px;
    line-height: 1.55;
}

.cn-course-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
}

.cn-course-meta span {
    color: var(--cn-text);
    font-weight: 900;
}

.cn-course-meta a,
.cn-post-card > a,
.cn-contact-actions a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 36px;
    padding: 8px 12px;
    border-radius: 10px;
    color: #ffffff;
    background: var(--cn-primary);
    font-size: 13px;
    font-weight: 800;
    text-decoration: none;
}

.cn-contact-actions a:hover {
    color: #ffffff;
    filter: brightness(.94);
    transform: translateY(-1px);
}

.cn-about-card {
    display: grid;
    grid-template-columns: minmax(0, 1.1fr) minmax(280px, .9fr);
    gap: 24px;
    padding: 22px;
}

.cn-about-card h4,
.cn-contact-card h4 {
    margin: 0 0 8px;
    font-size: 20px;
}

.cn-about-card p,
.cn-contact-card p {
    margin: 0;
    color: var(--cn-muted);
    line-height: 1.7;
}

.cn-about-card dl {
    display: grid;
    gap: 10px;
    margin: 0;
}

.cn-about-card dl div {
    padding: 12px;
    border: 1px solid var(--cn-border);
    border-radius: 12px;
    background: #fbfcff;
}

.cn-about-card dt {
    margin-bottom: 4px;
    color: var(--cn-muted);
    font-size: 12px;
    font-weight: 800;
    text-transform: uppercase;
}

.cn-about-card dd {
    margin: 0;
    color: var(--cn-text);
    font-weight: 800;
}

.cn-post-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
}

.cn-post-card {
    padding: 18px;
}

.cn-post-thumb {
    display: block;
    overflow: hidden;
    margin: -18px -18px 16px;
    border-radius: 16px 16px 0 0;
    aspect-ratio: 16 / 9;
}

.cn-post-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.cn-post-card small {
    display: block;
    margin: -4px 0 10px;
    color: var(--cn-muted);
}

.cn-post-card > a {
    color: var(--cn-primary);
    background: var(--cn-primary-soft);
}

.cn-contact-card {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    padding: 22px;
}

.cn-contact-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: flex-end;
}

.cn-contact-empty {
    padding: 10px 12px;
    border: 1px dashed var(--cn-border);
    border-radius: 10px;
    color: var(--cn-muted);
    background: #fbfcff;
    font-size: 13px;
    font-weight: 700;
}

.cn-teacher-empty {
    padding: 20px;
    border: 1px dashed #c7d2e5;
    border-radius: 14px;
    color: var(--cn-muted);
    background: #fbfcff;
    font-weight: 700;
}

.cn-banner-manager {
    width: min(100%, 1080px);
    margin: 28px auto;
    padding: 24px;
    border: 1px solid var(--cn-border, #dfe6f2);
    border-radius: 18px;
    background: #ffffff;
    box-shadow: 0 18px 44px rgba(15, 23, 42, .08);
    font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.cn-banner-manager-head {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 18px;
    margin-bottom: 18px;
}

.cn-banner-manager h2 {
    margin: 0 0 6px;
    color: #17203b;
    font-size: 28px;
}

.cn-banner-manager p {
    margin: 0;
    color: #6b7488;
    line-height: 1.6;
}

.cn-banner-notice {
    margin-bottom: 16px;
    padding: 12px 14px;
    border-radius: 12px;
    color: #205c34;
    background: #ecfdf3;
    font-weight: 800;
}

.cn-banner-notice-upload-failed,
.cn-banner-notice-no-file,
.cn-banner-notice-rejected {
    color: #a33434;
    background: #fff1f1;
}

.cn-banner-upload-form {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 14px;
    align-items: center;
    margin-bottom: 20px;
    padding: 16px;
    border: 1px solid #dfe6f2;
    border-radius: 14px;
    background: #f8faff;
}

.cn-banner-upload-form label {
    display: grid;
    gap: 8px;
    color: #17203b;
    font-size: 14px;
    font-weight: 800;
}

.cn-banner-upload-form input[type="file"] {
    width: 100%;
    padding: 12px;
    border: 1px dashed #b9c5f6;
    border-radius: 12px;
    background: #ffffff;
}

.cn-banner-upload-form button {
    min-height: 46px;
    padding: 11px 16px;
    border: 0;
    border-radius: 12px;
    color: #ffffff;
    background: #2948e8;
    font-weight: 900;
    cursor: pointer;
}

.cn-banner-manager-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
}

.cn-banner-gallery-card {
    padding: 16px;
    border: 1px solid #dfe6f2;
    border-radius: 14px;
    background: #ffffff;
}

.cn-banner-gallery-card h3 {
    margin: 0 0 12px;
    color: #17203b;
    font-size: 18px;
}

.cn-banner-gallery-empty {
    padding: 14px;
    border: 1px dashed #c7d2e5;
    border-radius: 12px;
    background: #fbfcff;
}

.cn-banner-gallery {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
}

.cn-banner-gallery figure {
    margin: 0;
    overflow: hidden;
    border: 1px solid #dfe6f2;
    border-radius: 12px;
    background: #f8faff;
}

.cn-banner-gallery img {
    display: block;
    width: 100%;
    aspect-ratio: 16 / 6;
    object-fit: cover;
}

.cn-banner-gallery figcaption {
    padding: 8px 10px;
    color: #6b7488;
    font-size: 12px;
    font-weight: 800;
}

@media (max-width: 1180px) {
    .cn-teacher-shell {
        grid-template-columns: 240px minmax(0, 1fr);
    }

    .cn-course-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .cn-teacher-hero {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 849px) {
    .cn-teacher-shell {
        display: block;
        padding: 18px 14px 42px;
    }

    .cn-teacher-sidebar {
        position: static;
        margin-bottom: 16px;
    }

    .cn-teacher-mini-card {
        grid-template-columns: auto minmax(0, 1fr);
        align-items: center;
    }

    .cn-teacher-avatar {
        width: 64px;
        height: 64px;
    }

    .cn-teacher-mini-card h1 {
        font-size: 20px;
    }

    .cn-teacher-nav {
        display: flex;
        overflow-x: auto;
        padding: 8px;
        scroll-snap-type: x mandatory;
    }

    .cn-teacher-nav-btn {
        flex: 0 0 auto;
        width: auto;
        padding-inline: 14px;
        white-space: nowrap;
        scroll-snap-align: start;
    }

    .cn-teacher-banner,
    .cn-teacher-banner-fallback {
        min-height: 210px;
        border-radius: 20px;
    }

    .cn-teacher-hero,
    .cn-teacher-panel {
        padding: 18px;
    }

    .cn-teacher-stats,
    .cn-course-grid,
    .cn-post-grid,
    .cn-about-card {
        grid-template-columns: 1fr;
    }

    .cn-contact-card {
        display: grid;
    }

    .cn-contact-actions {
        justify-content: flex-start;
    }

    .cn-banner-upload-form,
    .cn-banner-manager-grid,
    .cn-banner-gallery {
        grid-template-columns: 1fr;
    }
}

/* Self-service avatar editor */
.cn-teacher-avatar-area {
    position: relative;
    width: max-content;
}

.cn-teacher-avatar-edit {
    position: absolute;
    right: -3px;
    bottom: 2px;
    display: grid;
    width: 32px;
    height: 32px;
    padding: 0;
    place-items: center;
    border: 3px solid #fff;
    border-radius: 999px;
    color: #fff;
    background: var(--cn-primary);
    box-shadow: 0 6px 18px rgba(41, 72, 232, .3);
    cursor: pointer;
}

.cn-teacher-avatar-edit .material-symbols-rounded {
    font-size: 17px;
}

.cn-teacher-avatar-popover {
    position: absolute;
    z-index: 30;
    top: calc(100% + 10px);
    left: 0;
    width: min(310px, calc(100vw - 42px));
    padding: 14px;
    border: 1px solid var(--cn-border);
    border-radius: 14px;
    background: #fff;
    box-shadow: 0 18px 50px rgba(15, 23, 42, .18);
}

.cn-teacher-avatar-popover form {
    display: grid;
    gap: 11px;
}

.cn-teacher-avatar-file {
    display: grid;
    gap: 7px;
    font-size: 13px;
    font-weight: 800;
}

.cn-teacher-avatar-file input {
    width: 100%;
    padding: 9px;
    border: 1px solid var(--cn-border);
    border-radius: 10px;
    background: #f8faff;
    font-size: 12px;
}

.cn-teacher-avatar-remove {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    color: #4f5870;
    font-size: 12px;
    font-weight: 700;
}

.cn-teacher-avatar-remove input {
    margin-top: 2px;
}

.cn-teacher-avatar-popover small {
    color: var(--cn-muted);
    font-size: 11px;
    line-height: 1.45;
}

.cn-teacher-avatar-actions {
    display: flex;
    justify-content: flex-end;
    gap: 8px;
}

.cn-teacher-avatar-actions button {
    min-height: 36px;
    padding: 8px 12px;
    border: 0;
    border-radius: 9px;
    font-weight: 800;
    cursor: pointer;
}

.cn-avatar-cancel {
    color: #4f5870;
    background: #edf1f7;
}

.cn-avatar-save {
    color: #fff;
    background: var(--cn-primary);
}

.cn-teacher-avatar-notice {
    padding: 10px 12px;
    border: 1px solid #a7f3d0;
    border-radius: 11px;
    color: #065f46;
    background: #ecfdf5;
    font-size: 12px;
    font-weight: 750;
    line-height: 1.45;
}

.cn-teacher-avatar-notice.is-error {
    border-color: #fecdd3;
    color: #9f1239;
    background: #fff1f2;
}

.cn-teacher-avatar.is-pending-remove {
    opacity: .35;
}