.course-page {
    /* min-height: 100vh; */
    padding: 10px 0 44px;
    background: #f4f7fb;
    color: var(--home-text);
}

.course-shell {
    width: min(1180px, calc(100% - 28px));
    margin: 0 auto;
}

.course-panel {
    border-radius: 12px;
    background: #fff;
    box-shadow: var(--home-shadow);
}

.course-more {
    display: inline-flex;
    align-items: center;
    color: var(--home-primary);
    font-size: 14px;
    text-decoration: none;
    white-space: nowrap;
}

.course-more:after,
.course-file-link:after {
    content: "";
    width: 7px;
    height: 7px;
    margin-left: 6px;
    border-top: 1px solid currentColor;
    border-right: 1px solid currentColor;
    transform: rotate(45deg);
}

.course-banner {
    position: relative;
    left: 50%;
    width: 100vw;
    margin: 0 0 18px -50vw;
    background: #1f66d8;
    overflow: hidden;
    line-height: 0;
}

.course-banner img {
    display: block;
    width: 100%;
    height: auto;
}

.course-section,
.course-system {
    margin-top: 18px;
    padding: 20px 22px 22px;
    border-radius: 12px;
    background: #fff;
    box-shadow: var(--home-shadow);
}

.course-section-head {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: 16px;
    margin-bottom: 16px;
}

.course-section-title {
    margin: 0;
    font-size: 24px;
    line-height: 1.3;
    font-weight: 700;
}

.course-section-subtitle {
    margin-left: 10px;
    font-size: 12px;
    color: var(--home-subtle);
    text-transform: uppercase;
}

.course-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 14px;
}

.course-card {
    display: block;
    overflow: hidden;
    border-radius: 9px;
    background: #fff;
    text-decoration: none;
    color: inherit;
    box-shadow: 0 0 0 1px var(--home-border);
    transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}

.course-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 14px 28px rgba(31, 47, 69, .09);
}

.course-cover {
    aspect-ratio: 16 / 8.8;
    border-radius: 9px 9px 0 0;
    overflow: hidden;
    background: var(--home-media-bg);
}

.course-cover img {
    width: 100%;
    height: 100%;
    /* object-fit: cover; */
    display: block;
}

.course-body {
    padding: 13px 14px 14px;
}

.course-name {
    margin: 0;
    font-size: 17px;
    line-height: 1.35;
    font-weight: 700;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.course-meta {
    display: flex;
    gap: 7px;
    flex-wrap: wrap;
    margin-top: 9px;
    color: var(--home-muted);
    font-size: 13px;
}

.course-meta > span {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    min-height: 24px;
    padding: 0 8px;
    border-radius: 999px;
    background: #f3f8fd;
}

.course-meta em {
    font-style: normal;
    color: #7c8fa8;
}

.course-meta b {
    font-weight: 700;
    color: var(--home-text);
}

.course-meta-hour,
.course-meta-difficulty {
    flex: 1 1 0;
    min-width: 0;
    justify-content: center;
    white-space: nowrap;
}

.course-meta-level {
    flex: 0 0 100%;
    width: 100%;
    max-width: 100%;
    justify-content: center;
    overflow: hidden;
}

.course-meta-level b {
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.course-stars {
    display: inline-flex;
    align-items: center;
    gap: 2px;
    min-height: 24px;
    color: #f5a623;
    font-size: 13px;
    font-weight: 700;
}

.course-stars i {
    display: inline-block;
    width: auto;
    height: auto;
    background: none;
    line-height: 1;
}

.course-stars i:before {
    content: "★";
}

.course-system-title {
    display: flex;
    align-items: baseline;
    gap: 10px;
    margin-bottom: 14px;
}

.course-system-title h2 {
    margin: 0;
    font-size: 24px;
    line-height: 1.35;
    font-weight: 700;
}

.course-system-title span {
    font-size: 12px;
    color: var(--home-subtle);
    text-transform: uppercase;
}

.course-system-image {
    margin-top: 14px;
    border-radius: 10px;
    overflow: hidden;
    background: #fff;
}

.course-system-image img {
    display: block;
    width: 100%;
    height: auto;
}

.course-empty {
    padding: 40px 0;
    text-align: center;
    color: var(--home-subtle);
    font-size: 15px;
}

.course-panel {
    padding: 18px 22px 24px;
}

.course-filter {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    margin-bottom: 16px;
}

.course-tabs {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    min-width: 0;
}

.course-tabs button {
    height: 34px;
    padding: 0 16px;
    border: 0;
    border-radius: 99px;
    background: var(--home-soft);
    color: var(--home-muted);
    font-size: 14px;
    cursor: pointer;
}

.course-tabs button.is-active {
    background: var(--home-primary);
    color: #fff;
}

.course-search {
    display: flex;
    align-items: center;
    gap: 8px;
    flex: 0 0 auto;
}

.course-search input {
    width: 220px;
    height: 36px;
    padding: 0 12px;
    border: 1px solid var(--home-border);
    border-radius: 8px;
    background: #fff;
    font-size: 14px;
    outline: none;
}

.course-search button {
    width: 76px;
    height: 36px;
    border: 0;
    border-radius: 8px;
    background: var(--home-primary);
    color: #fff;
    font-size: 14px;
    cursor: pointer;
}

.course-search button.is-plain {
    background: #fff;
    color: var(--home-muted);
    box-shadow: inset 0 0 0 1px var(--home-border);
}

.course-pagination {
    display: flex;
    justify-content: center;
    margin-top: 22px;
}

.course-hero {
    display: grid;
    grid-template-columns: minmax(260px, .78fr) minmax(0, 1.22fr);
    align-items: center;
    gap: 22px;
    padding: 18px 20px;
    margin-bottom: 16px;
}

.course-info {
    min-width: 0;
}

.course-type {
    display: inline-flex;
    margin-bottom: 6px;
    color: var(--home-primary);
    font-size: 13px;
    font-weight: 700;
}

.course-hero .course-cover {
    aspect-ratio: 16 / 8.1;
    border-radius: 8px;
}

.course-hero .course-name {
    font-size: 25px;
    line-height: 1.35;
}

.course-desc {
    display: -webkit-box;
    margin: 10px 0 0;
    overflow: hidden;
    color: var(--home-muted);
    font-size: 14px;
    line-height: 1.7;
    white-space: pre-wrap;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
}

.course-hero .course-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 14px;
}

.course-hero .course-meta span {
    display: inline-flex;
    min-height: 36px;
    padding: 0 12px;
    border-radius: 8px;
    background: #f6f9fd;
    box-shadow: inset 0 0 0 1px rgba(27, 100, 177, .08);
    flex-direction: row;
    align-items: center;
    justify-content: center;
    text-align: center;
}

.course-hero .course-meta em {
    margin: 0 8px 0 0;
    color: #7c8fa8;
    font-size: 12px;
    font-style: normal;
    font-weight: 500;
}

.course-hero .course-meta b {
    color: var(--home-text);
    font-size: 15px;
    line-height: 1.25;
    font-weight: 700;
}

.course-hero .course-stars {
    display: inline-flex;
    justify-content: center;
    gap: 3px;
    min-height: 23px;
    color: #f5a623;
}

.course-hero .course-stars i {
    width: auto;
    height: auto;
    line-height: 1;
}

.course-chapter {
    padding: 14px 0;
    border-top: 1px solid var(--home-border);
}

.course-chapter:first-of-type {
    border-top: 0;
}

.course-section > h2,
.course-side h2 {
    margin: 0 0 16px;
    font-size: 22px;
    line-height: 1.35;
}

.course-chapter-title {
    margin: 0 0 10px;
    font-size: 18px;
    line-height: 1.4;
    word-break: break-word;
    overflow-wrap: anywhere;
}

.course-section-list {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px;
}

.course-section-item {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 12px;
    width: 100%;
    min-height: 46px;
    padding: 10px 12px;
    border: 0;
    border-radius: 8px;
    background: var(--home-soft);
    color: inherit;
    text-align: left;
    cursor: pointer;
}

.course-section-item.is-active {
    background: #e8f3fb;
    color: var(--home-primary);
}

.course-section-item.is-locked {
    cursor: not-allowed;
    color: var(--home-subtle);
}

.course-section-name {
    display: block;
    flex: 1 1 auto;
    min-width: 0;
    font-size: 15px;
    line-height: 1.4;
    white-space: normal;
    word-break: break-word;
    overflow-wrap: anywhere;
}

.course-section-status {
    flex: 0 0 auto;
    color: var(--home-primary);
    font-size: 13px;
}

.course-section-item.is-locked .course-section-status {
    color: var(--home-subtle);
}

.course-layout {
    display: grid;
    grid-template-columns: 300px minmax(0, 1fr);
    gap: 18px;
    align-items: start;
}

.course-main,
.course-side {
    padding: 20px 10px;
}

.course-side {
    position: sticky;
    top: 74px;
    max-height: calc(100vh - 92px);
    overflow: auto;
}

.course-lesson-title {
    margin: 0;
    font-size: 24px;
    line-height: 1.35;
    font-weight: 700;
}

.course-lesson-sub {
    margin: 8px 0 0;
    color: var(--home-muted);
    font-size: 14px;
}

.course-resource-tabs {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 10px;
    margin-top: 18px;
}

.course-resource-tabs button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 7px;
    min-height: 42px;
    border: 0;
    border-radius: 9px;
    background: #f4f8fc;
    color: var(--home-muted);
    font-size: 15px;
    cursor: pointer;
    transition: color .18s ease, background .18s ease, box-shadow .18s ease;
}

.course-resource-tabs button.is-active {
    background: var(--home-primary);
    color: #fff;
    box-shadow: 0 10px 18px rgba(27, 100, 177, .18);
}

.course-resource-tabs button.is-empty:not(.is-active) {
    color: #9aa8b8;
}

.course-content {
    margin-top: 18px;
}

.course-ppt-player {
    overflow: hidden;
    border-radius: 5px;
    background: #f6f9fc;
    /* box-shadow: inset 0 0 0 1px rgba(203, 216, 229, .72); */
}

.course-ppt-player.is-fullscreen,
.course-ppt-player:fullscreen,
.course-ppt-player:-webkit-full-screen,
.course-ppt-player:-moz-full-screen,
.course-ppt-player:-ms-fullscreen {
    position: fixed;
    inset: 0;
    z-index: 9999;
    display: grid;
    grid-template-rows: minmax(0, 1fr) auto;
    width: 100vw;
    height: 100vh;
    height: 100dvh;
    min-height: 100vh;
    min-height: 100dvh;
    border-radius: 0;
    background: #10151d;
    box-shadow: none;
}

.course-ppt-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    min-height: 50px;
    padding: 0 16px;
    background: #fff;
    color: var(--home-text);
}

.course-ppt-toolbar strong {
    min-width: 0;
    font-size: 16px;
    line-height: 1.35;
    font-weight: 700;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.course-ppt-toolbar span {
    flex: 0 0 auto;
    min-width: 86px;
    padding: 5px 10px;
    border-radius: 99px;
    background: #edf5ff;
    color: var(--home-primary);
    font-size: 13px;
    line-height: 1.3;
    font-weight: 700;
    text-align: center;
}

.course-ppt-stage {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    height: 95%;
    /* min-height: 520px; */
    padding: 0px 0px;
}

.course-ppt-frame {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 100%;
    min-height: 0;
    overflow: hidden;
    border-radius: 10px;
    background: #fff;
    box-shadow: 0 14px 34px rgba(31, 47, 69, .1);
}

.course-ppt-frame img {
    display: block;
    width: 100%;
    height: 100%;
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

.course-ppt-frame iframe {
    width: 100%;
    height: 100%;
    border: 0;
    background: #fff;
}

.course-ppt-player.is-fullscreen .course-ppt-stage,
.course-ppt-player:fullscreen .course-ppt-stage,
.course-ppt-player:-webkit-full-screen .course-ppt-stage,
.course-ppt-player:-moz-full-screen .course-ppt-stage,
.course-ppt-player:-ms-fullscreen .course-ppt-stage {
    position: relative;
    width: 100vw;
    height: 100%;
    min-height: 0;
    padding: 0;
}

.course-ppt-player.is-fullscreen .course-ppt-frame,
.course-ppt-player:fullscreen .course-ppt-frame,
.course-ppt-player:-webkit-full-screen .course-ppt-frame,
.course-ppt-player:-moz-full-screen .course-ppt-frame,
.course-ppt-player:-ms-fullscreen .course-ppt-frame {
    width: 100vw;
    height: 100%;
    min-height: 0;
    border-radius: 0;
    background: #10151d;
    box-shadow: none;
}

.course-ppt-player.is-fullscreen .course-ppt-frame img,
.course-ppt-player:fullscreen .course-ppt-frame img,
.course-ppt-player:-webkit-full-screen .course-ppt-frame img,
.course-ppt-player:-moz-full-screen .course-ppt-frame img,
.course-ppt-player:-ms-fullscreen .course-ppt-frame img {
    width: 100%;
    height: 100%;
    max-width: none;
    max-height: none;
    object-fit: cover;
}

.course-ppt-player.is-fullscreen .course-ppt-frame iframe,
.course-ppt-player:fullscreen .course-ppt-frame iframe,
.course-ppt-player:-webkit-full-screen .course-ppt-frame iframe,
.course-ppt-player:-moz-full-screen .course-ppt-frame iframe,
.course-ppt-player:-ms-fullscreen .course-ppt-frame iframe {
    width: 100vw;
    height: 100%;
}

.course-ppt-arrow {
    position: absolute;
    top: 50%;
    z-index: 2;
    width: 56px;
    height: 72px;
    border: 0;
    border-radius: 8px;
    background: rgba(0, 0, 0, .28);
    color: rgba(255, 255, 255, .9);
    box-shadow: 0 8px 18px rgba(0, 0, 0, .12);
    cursor: pointer;
    transform: translateY(-50%);
    transition: background .18s ease, color .18s ease, opacity .18s ease;
}

.course-ppt-arrow:before {
    content: "";
    position: absolute;
    top: 50%;
    left: 50%;
    width: 18px;
    height: 18px;
    border-top: 3px solid currentColor;
    border-right: 3px solid currentColor;
}

.course-ppt-arrow.is-prev {
    left: 0;
}

.course-ppt-arrow.is-prev:before {
    transform: translate(-35%, -50%) rotate(-135deg);
}

.course-ppt-arrow.is-next {
    right: 0;
}

.course-ppt-arrow.is-next:before {
    transform: translate(-65%, -50%) rotate(45deg);
}

.course-ppt-arrow:hover:not(:disabled) {
    background: rgba(0, 0, 0, .42);
    color: #fff;
}

.course-ppt-arrow:disabled {
    cursor: not-allowed;
    opacity: .18;
}

.course-ppt-player.is-fullscreen .course-ppt-arrow,
.course-ppt-player:fullscreen .course-ppt-arrow,
.course-ppt-player:-webkit-full-screen .course-ppt-arrow,
.course-ppt-player:-moz-full-screen .course-ppt-arrow,
.course-ppt-player:-ms-fullscreen .course-ppt-arrow {
    background: rgba(0, 0, 0, .32);
    color: rgba(255, 255, 255, .62);
}

.course-ppt-player.is-fullscreen .course-ppt-arrow:hover:not(:disabled),
.course-ppt-player:fullscreen .course-ppt-arrow:hover:not(:disabled),
.course-ppt-player:-webkit-full-screen .course-ppt-arrow:hover:not(:disabled),
.course-ppt-player:-moz-full-screen .course-ppt-arrow:hover:not(:disabled),
.course-ppt-player:-ms-fullscreen .course-ppt-arrow:hover:not(:disabled) {
    background: rgba(0, 0, 0, .48);
    color: #fff;
}

.course-ppt-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 14px;
    min-height: 42px;
    padding: 7px 10px;
    background: #fff;
    box-shadow: inset 0 3px 0 var(--home-primary);
}

.course-ppt-player.is-fullscreen .course-ppt-footer,
.course-ppt-player:fullscreen .course-ppt-footer,
.course-ppt-player:-webkit-full-screen .course-ppt-footer,
.course-ppt-player:-moz-full-screen .course-ppt-footer,
.course-ppt-player:-ms-fullscreen .course-ppt-footer {
    position: relative;
    flex: 0 0 auto;
    height: auto;
    min-height: 42px;
    padding-top: 0;
    padding-bottom: 0;
    background: rgba(16, 21, 29, .94);
    box-shadow: inset 0 3px 0 var(--home-primary);
}

.course-ppt-pages {
    display: flex;
    flex: 1 1 auto;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: 6px;
    min-width: 0;
    overflow: visible;
}

.course-ppt-page {
    flex: 0 0 auto;
    width: 18px;
    height: 18px;
    border: 0;
    border-radius: 999px;
    background: #d4dbe3;
    color: #fff;
    font-size: 11px;
    line-height: 18px;
    font-weight: 700;
    text-align: center;
    cursor: pointer;
    transition: background .16s ease, color .16s ease, transform .16s ease;
}

.course-ppt-page:hover,
.course-ppt-page.is-active {
    background: var(--home-primary);
    color: #fff;
    transform: translateY(-1px);
}

.course-ppt-fullscreen {
    flex: 0 0 auto;
    height: 32px;
    padding: 0 12px;
    border: 0;
    border-radius: 7px;
    background: #38ad49;
    color: #fff;
    font-size: 14px;
    font-weight: 700;
    cursor: pointer;
    white-space: nowrap;
    transition: background .16s ease, box-shadow .16s ease;
}

.course-ppt-fullscreen:hover {
    background: #2c9b3d;
    box-shadow: 0 8px 18px rgba(56, 173, 73, .18);
}

.course-ppt-player.is-fullscreen .course-ppt-fullscreen,
.course-ppt-player:fullscreen .course-ppt-fullscreen,
.course-ppt-player:-webkit-full-screen .course-ppt-fullscreen,
.course-ppt-player:-moz-full-screen .course-ppt-fullscreen,
.course-ppt-player:-ms-fullscreen .course-ppt-fullscreen {
    background: #38ad49;
}

.course-file {
    margin-top: 14px;
    overflow: hidden;
    border-radius: 10px;
    background: var(--home-soft);
}

.course-file:first-child {
    margin-top: 0;
}

.course-file img {
    width: 100%;
    height: auto;
    display: block;
}

.course-file video {
    width: 100%;
    max-height: 620px;
    display: block;
    background: #000;
}

.course-file iframe {
    width: 100%;
    height: 640px;
    border: 0;
    background: #fff;
    display: block;
}

.course-file-link {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 16px;
    color: var(--home-primary);
    font-size: 15px;
    text-decoration: none;
}

.course-side .course-chapter {
    padding: 12px 0;
}

.course-side .course-chapter-title {
    margin-bottom: 8px;
    font-size: 15px;
    font-weight: 700;
}

.course-side .course-section-list {
    grid-template-columns: 1fr;
    gap: 8px;
}

.course-side .course-section-item {
    min-height: 40px;
    padding: 8px 10px;
    gap: 10px;
    background: #f8fbff;
}

.course-side .course-section-item.is-active {
    color: var(--home-primary);
    background: #eef6ff;
    box-shadow: inset 3px 0 0 var(--home-primary);
}

.course-side .course-section-name {
    font-size: 14px;
}

.course-share-panel {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    margin-top: 12px;
    padding: 10px 12px;
    border: 1px solid rgba(205, 220, 235, .7);
    border-radius: 9px;
    background: #fbfdff;
}

.course-qrcode-box {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-top: 0;
    padding: 6px;
    border-radius: 8px;
    background: #fff;
}

.course-share-qrcode-box {
    width: fit-content;
    max-width: 100%;
    margin-top: 0;
    margin-left: auto;
    box-shadow: inset 0 0 0 1px rgba(205, 220, 235, .86);
}

.course-share-summary {
    flex: 1 1 auto;
    min-width: 0;
}

.course-share-copy {
    display: flex;
    align-items: center;
    gap: 10px;
    min-width: 0;
    text-align: left;
}

.course-share-copy em {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex: 0 0 44px;
    height: 24px;
    border-radius: 999px;
    background: #edf6ff;
    color: var(--home-primary);
    font-size: 13px;
    font-style: normal;
    font-weight: 700;
}

.course-share-copy strong {
    display: block;
    color: var(--home-text);
    font-size: 14px;
    line-height: 1.35;
    font-weight: 700;
}

.course-share-copy span {
    display: block;
    margin-top: 2px;
    color: var(--home-muted);
    font-size: 13px;
    line-height: 1.5;
}

.course-qrcode-canvas {
    flex: 0 0 76px;
    width: 76px;
    height: 76px;
    padding: 4px;
    border-radius: 7px;
    background: #fff;
}

.course-qrcode-canvas canvas,
.course-qrcode-canvas img,
.course-qrcode-canvas svg {
    display: block;
    width: 100% !important;
    height: 100% !important;
}

.course-qrcode-box p {
    margin: 0;
    color: var(--home-muted);
    font-size: 13px;
    line-height: 1.7;
}

@media (max-width: 980px) {
    .course-filter {
        align-items: stretch;
        flex-direction: column;
    }

    .course-search {
        width: 100%;
    }

    .course-search input {
        flex: 1;
        width: auto;
    }

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

    .course-layout {
        grid-template-columns: 1fr;
    }

    .course-side {
        order: 1;
        max-height: none;
        overflow: visible;
        position: static;
    }

    .course-main {
        order: 2;
    }
}

@media (max-width: 860px) {
    .course-hero {
        grid-template-columns: 1fr;
        align-items: stretch;
    }

    .course-section-list {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 560px) {
    .course-page {
        padding-top: 6px;
    }

    .course-system-title {
        display: block;
    }

    .course-banner {
        margin-bottom: 14px;
    }

    .course-banner img {
        height: auto;
    }

    .course-section,
    .course-system,
    .course-panel,
    .course-hero,
    .course-main,
    .course-side {
        padding: 12px;
    }

    .course-layout {
        gap: 10px;
    }

    .course-main {
        order: 1;
    }

    .course-side {
        order: 2;
    }

    .course-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 10px;
    }

    .course-body {
        padding: 10px;
    }

    .course-name {
        font-size: 15px;
    }

    .course-meta {
        gap: 5px;
        margin-top: 7px;
        font-size: 12px;
    }

    .course-meta > span {
        gap: 3px;
        min-height: 22px;
        padding: 0 5px;
    }

    .course-meta em {
        font-size: 11px;
    }

    .course-stars {
        min-height: 22px;
        font-size: 12px;
    }

    .course-section-title,
    .course-system-title h2,
    .course-lesson-title {
        font-size: 22px;
    }

    .course-section-subtitle,
    .course-system-title span {
        display: block;
        margin: 2px 0 0;
    }

    .course-search {
        flex-wrap: wrap;
    }

    .course-search input {
        flex-basis: 100%;
    }

    .course-resource-tabs {
        gap: 7px;
        margin-top: 10px;
    }

    .course-resource-tabs button {
        gap: 4px;
        min-height: 34px;
        font-size: 13px;
    }

    .course-content {
        margin-top: 10px;
    }

    .course-hero {
        grid-template-columns: 88px minmax(0, 1fr);
        gap: 10px;
        margin-bottom: 10px;
    }

    .course-hero .course-cover {
        height: 74px;
        aspect-ratio: auto;
        border-radius: 7px;
    }

    .course-hero .course-name {
        display: -webkit-box;
        overflow: hidden;
        font-size: 19px;
        -webkit-line-clamp: 2;
        -webkit-box-orient: vertical;
        white-space: normal;
    }

    .course-type {
        margin-bottom: 4px;
        font-size: 12px;
    }

    .course-desc {
        grid-column: 1 / -1;
        margin-top: 8px;
        font-size: 13px;
        line-height: 1.55;
        -webkit-line-clamp: 1;
    }

    .course-hero .course-meta {
        grid-column: 1 / -1;
        gap: 7px;
        margin-top: 8px;
    }

    .course-hero .course-meta span {
        flex: 0 1 auto;
        min-height: 30px;
        min-width: 0;
        padding: 0 8px;
    }

    .course-hero .course-meta em {
        margin-right: 6px;
        font-size: 12px;
    }

    .course-hero .course-meta b {
        font-size: 14px;
    }

    .course-lesson-title {
        display: -webkit-box;
        overflow: hidden;
        font-size: 20px;
        line-height: 1.35;
        -webkit-line-clamp: 2;
        -webkit-box-orient: vertical;
    }

    .course-lesson-sub {
        margin-top: 4px;
        font-size: 13px;
        line-height: 1.5;
    }

    .course-side h2 {
        margin-bottom: 10px;
        font-size: 18px;
    }

    .course-side .course-chapter {
        padding: 8px 0;
    }

    .course-side .course-chapter-title {
        margin-bottom: 7px;
        font-size: 15px;
    }

    .course-side .course-section-list {
        gap: 7px;
    }

    .course-side .course-section-item {
        min-height: 38px;
        padding: 8px 10px;
    }

    .course-share-panel {
        display: none;
    }

    .course-file iframe {
        height: 520px;
    }

    .course-ppt-toolbar {
        min-height: 46px;
        padding: 0 12px;
    }

    .course-ppt-toolbar strong {
        font-size: 15px;
    }

    .course-ppt-toolbar span {
        min-width: 74px;
        padding: 4px 8px;
        font-size: 12px;
    }

    .course-ppt-stage {
        height: 300px;
        min-height: 300px;
        padding: 12px;
    }

    .course-ppt-frame {
        height: 100%;
        min-height: 0;
        box-shadow: 0 8px 18px rgba(31, 47, 69, .08);
    }

    .course-ppt-frame img {
        height: 100%;
        max-height: 100%;
    }

    .course-ppt-frame iframe {
        height: 100%;
    }

    .course-ppt-arrow {
        width: 36px;
        height: 54px;
    }

    .course-ppt-arrow:before {
        width: 13px;
        height: 13px;
    }

    .course-ppt-footer {
        gap: 8px;
        padding: 8px;
    }

    .course-ppt-pages {
        justify-content: flex-start;
        gap: 5px;
    }

    .course-ppt-page {
        width: 20px;
        height: 20px;
        font-size: 11px;
        line-height: 20px;
    }

    .course-ppt-fullscreen {
        height: 32px;
        padding: 0 10px;
        font-size: 13px;
    }
}