@charset "utf-8";
* {
    padding:0;
    margin:0;
}
html,body {
    width:100%;
    margin:0 auto;
    font-family:"微软雅黑","Helvetica Neue",Helvetica,Arial,sans-serif;
    background:#efefef;
    font-size:14px;
}

input {
    outline:none!important;
}
ul {
    list-style:none;
}
ol {
    list-style:none;
}
a {
    text-decoration:none;
}
img {
    border:none;
}
a {
    color:black
}
a:link {
    text-decoration:none!important;
}
a:visited {
    text-decoration:none!important;
}
a:hover {
    text-decoration:none!important;
}
a:active {
    text-decoration:none!important;
}

.container {
    width: 1200px;
    margin: 0 auto;
}

.site-header {
    width: 100%;
    background: #ffffff;
    height: 88px;
    display: flex;
    align-items: center;
    border-bottom: 1px solid #ededed;
}

.header-inner {
    display: flex;
    align-items: center;
}

.logo img {
    width: auto;
    display: block;
}

.nav {
    flex: 1;
    display: flex;
    justify-content: center;
    gap: 38px;
}

.nav-link {
    font-size: 16px;
    color: #333333;
    line-height: 1;
}

.nav-link:hover {
    color: #1f6fff;
}

.cta-btn {
    background: #1f6fff;
    color: #ffffff;
    padding: 10px 22px;
    border-radius: 6px;
    font-size: 16px;
}

.cta-btn:hover {
    background: #155fd1;
}

.hero {
    padding: 110px 0;
    text-align: center;
    background: linear-gradient(135deg, rgb(224, 242, 254) 0%, rgb(221, 214, 254) 50%, rgb(241, 245, 249) 100%);
}

.hero-title {
    font-size: 58px;
    color: #1c1c1c;
    font-weight: 800;
    margin-bottom: 14px;
}

.hero-subtitle {
    text-align: center;
    max-width: 980px;
    margin: 0 auto;
}

.hero-subtitle-line {
    font-size: 16px;
    color: #666666;
    line-height: 1.9;
}

.hero-subtitle-line-primary {
    font-size: 22px;
    color: #1c1c1c;
    margin-bottom: 8px;
    line-height: 1.7;
}

.hero-subtitle-line-secondary {
    color: #7c83d6;
    font-size: 15px;
    line-height: 1.8;
}

.hero-inner {
    background: transparent;
    border-radius: 0;
    padding: 0;
}



.course-section {
    padding: 28px 0 60px;
    background: #ffffff;
}

.course-header {
    text-align: center;
    margin-bottom: 18px;
}

.course-title {
    font-size: 28px;
    color: #1c1c1c;
    font-weight: 800;
    margin-bottom: 8px;
}

.course-subtitle {
    font-size: 14px;
    color: #8a8a8a;
}

.course-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 28px;
    align-items: start;
}

.course-card {
    background: #ffffff;
    border-radius: 14px;
    overflow: hidden;
    border: 1px solid rgba(0, 0, 0, 0.03);
    box-shadow: 0 12px 28px rgba(15, 23, 42, 0.08);
    transition: transform 0.25s ease, box-shadow 0.25s ease;
    display: flex;
    flex-direction: column;
    align-self: start;
}

.course-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 18px 40px rgba(15, 23, 42, 0.18);
}

.course-banner {
    position: relative;
    height: 170px;
    background: #f5f6ff;
}

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

.course-badge {
    position: absolute;
    top: 14px;
    left: 16px;
    background: #ff4d4f;
    color: #ffffff;
    font-size: 12px;
    padding: 4px 10px;
    border-radius: 999px;
    z-index: 2;
}

.course-card-body {
    padding: 18px 20px 12px;
    flex: 0 0 auto;
    display: flex;
    flex-direction: column;
}

.course-card-title {
    font-size: 18px;
    font-weight: 800;
    color: #1c1c1c;
    margin-bottom: 10px;
}

.course-card-desc {
    font-size: 14px;
    color: #6b7280;
    line-height: 1.8;
    margin-bottom: 16px;
}

.course-card-section-title {
    font-size: 14px;
    font-weight: 700;
    color: #1f2937;
    margin-bottom: 8px;
}

.course-list {
    padding-left: 14px;
    margin-bottom: 14px;
}

.course-list li {
    font-size: 13px;
    color: #6b7280;
    line-height: 1.7;
    margin: 8px 0;
    list-style: disc;
}

.course-catalog {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 14px;
    color: #2563eb;
    padding: 10px 0 0;
    font-weight: 700;
    cursor: pointer;
    user-select: none;
}

.course-chevron {
    width: 10px;
    height: 10px;
    display: inline-block;
    border-right: 2px solid #2563eb;
    border-bottom: 2px solid #2563eb;
    transform: rotate(45deg);
    transition: transform 0.2s ease;
}

.course-catalog.open .course-chevron {
    transform: rotate(-135deg);
}

.course-catalog-panel {
    display: none;
    position: relative;
    padding: 10px 0 0 22px;
}

.course-catalog.open + .course-catalog-panel {
    display: block;
}

.course-catalog-panel::before {
    content: "";
    position: absolute;
    left: 11px;
    top: 12px;
    bottom: 0;
    width: 2px;
    background: rgba(37, 99, 235, 0.15);
    border-radius: 2px;
}

.course-catalog-items {
    margin: 0;
    padding: 0;
}

.course-catalog-items li {
    list-style: none;
    font-size: 14px;
    color: #6b7280;
    line-height: 1.9;
    padding: 6px 0;
}

.course-card-footer {
    padding: 16px 20px 18px;
    display: flex;
    gap: 14px;
}

.course-btn {
    flex: 1;
    height: 34px;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 700;
    cursor: pointer;
    text-align: center;
    line-height: 34px;
}

.course-btn.primary {
    background: #2563eb;
    border: 1px solid #2563eb;
    color: #ffffff;
}

.course-btn.primary:hover {
    background: #1d4ed8;
    border-color: #1d4ed8;
}

.course-btn.outline {
    background: #ffffff;
    border: 1px solid #3b82f6;
    color: #2563eb;
}

.course-btn.outline:hover {
    border-color: #1d4ed8;
    color: #1d4ed8;
}


.premium-section {
    padding: 34px 0 70px;
    background: #f8fafc;
}

.premium-header {
    text-align: center;
    margin-bottom: 18px;
}

.premium-title {
    font-size: 28px;
    color: #1c1c1c;
    font-weight: 800;
    margin-bottom: 6px;
}

.premium-subtitle {
    font-size: 14px;
    color: #8a8a8a;
}

.premium-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 26px;
}

.premium-empty {
    grid-column: 1 / -1;
    text-align: center;
    color: #64748b;
    font-size: 14px;
    padding: 20px 0;
}

.premium-card {
    background: #ffffff;
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid rgba(0, 0, 0, 0.04);
    box-shadow: 0 10px 26px rgba(15, 23, 42, 0.06);
    transition: transform 0.25s ease, box-shadow 0.25s ease;
    display: flex;
    flex-direction: column;
}

.premium-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 18px 46px rgba(15, 23, 42, 0.18);
}

.premium-media {
    position: relative;
    height: 138px;
}

.premium-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform 0.25s ease;
}

.premium-card:hover .premium-img {
    transform: scale(1.06);
}

.premium-badge {
    position: absolute;
    top: 10px;
    right: 10px;
    background: rgba(20, 35, 80, 0.85);
    color: #ffffff;
    font-size: 12px;
    padding: 4px 10px;
    border-radius: 999px;
    z-index: 2;
}

.premium-body {
    padding: 14px 16px 8px;
    flex: 1;
}

.premium-card-title {
    font-size: 14px;
    font-weight: 800;
    color: #1c1c1c;
    margin-bottom: 8px;
    line-height: 1.5;
}

.premium-card-desc {
    font-size: 13px;
    color: #6b7280;
    line-height: 1.7;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.premium-footer {
    padding: 0 16px 16px;
}

.premium-btn {
    width: 100%;
    height: 34px;
    border-radius: 8px;
    border: 1px solid #3b82f6;
    background: #ffffff;
    color: #2563eb;
    font-size: 14px;
    cursor: pointer;
    transition: background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.premium-card:hover .premium-btn {
    background: #2563eb;
    border-color: #2563eb;
    color: #ffffff;
}



.cta-section {
    background: #f2f6fb;
    padding: 78px 0 90px;
    text-align: center;
}

.cta-title {
    font-size: 38px;
    font-weight: 900;
    color: #0f172a;
    letter-spacing: 1px;
    margin-bottom: 18px;
}

.cta-subtitle {
    font-size: 18px;
    color: #334155;
    line-height: 1.8;
    margin-bottom: 34px;
}

.cta-actions {
    display: flex;
    justify-content: center;
    gap: 26px;
    margin-bottom: 28px;
}

.cta-action-btn {
    width: 160px;
    height: 48px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 12px;
    font-size: 16px;
    font-weight: 800;
    transition: transform 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.cta-action-btn.primary {
    background: #2563eb;
    border: 1px solid #2563eb;
    color: #ffffff;
    box-shadow: 0 12px 26px rgba(37, 99, 235, 0.25);
}

.cta-action-btn.primary:hover {
    background: #1d4ed8;
    border-color: #1d4ed8;
    transform: translateY(-2px);
    box-shadow: 0 16px 34px rgba(37, 99, 235, 0.3);
}

.cta-action-btn.outline {
    background: #ffffff;
    border: 1px solid #2563eb;
    color: #2563eb;
}

.cta-action-btn.outline:hover {
    transform: translateY(-2px);
    box-shadow: 0 14px 30px rgba(15, 23, 42, 0.12);
}

.cta-footnote {
    font-size: 16px;
    color: #64748b;
}

.course-top-hero {
    position: relative;
    min-height: 380px;
    background-position: center center;
    background-size: cover;
    background-repeat: no-repeat;
    background-image: none;
    overflow: hidden;
    min-width: 1200px;
}

.course-top-mask {
    position: absolute;
    inset: 0;
    background: rgba(10, 24, 54, 0.9);
}

.course-top-inner {
    position: relative;
    z-index: 2;
    min-height: 380px;
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 24px;
    padding-top: 30px;
}

.course-top-left {
    color: #ffffff;
    max-width: 900px;
}

.course-top-back {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: rgba(255, 255, 255, 0.85);
    font-size: 16px;
    width: 100%;
    padding-bottom: 0;
    border-bottom: none;
    margin-bottom: 50px;
}

.course-top-back-icon::before {
    content: "\2039";
    font-size: 18px;
    line-height: 1;
    font-style: normal;
}

.course-top-tags {
    display: flex;
    gap: 8px;
    margin-bottom: 16px;
}

.course-top-tag {
    font-size: 12px;
    border-radius: 999px;
    padding: 3px 10px;
    line-height: 1;
}

.course-top-tag.red {
    background: #ff4d4f;
    color: #ffffff;
}

.course-top-tag.dark {
    background: rgba(255, 255, 255, 0.24);
    border: 1px solid rgba(255, 255, 255, 0.24);
    color: #ffffff;
}

.course-top-title {
    font-size: 40px;
    color: #ffffff;
    font-weight: 800;
    margin-bottom: 12px;
}

.course-top-desc {
    font-size: 16px;
    color: rgba(255, 255, 255, 0.92);
    line-height: 1.8;
    margin-bottom: 18px;
}

.course-top-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 24px;
    font-size: 16px;
    color: rgba(255, 255, 255, 0.85);
    align-items: center;
}

.course-top-meta .meta-item {
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.course-top-meta .meta-item strong {
    color: #ffffff;
    font-weight: 700;
}

.course-top-meta .meta-icon {
    font-size: 18px;
    color: #ffffff;
    font-style: normal;
    line-height: 1;
    font-family: "Arial", sans-serif;
}

.course-top-meta .meta-icon.star {
    color: #facc15;
}

.course-top-meta .meta-icon.star::before {
    content: "\2605";
}

.course-top-meta .meta-icon.time::before {
    content: "\25F7";
}

.course-top-meta .meta-icon.lesson::before {
    content: "\1F4D6";
}

.course-top-card {
    width: 310px;
    background: #ffffff;
    border-radius: 14px;
    padding: 18px 16px 14px;
    box-shadow: 0 16px 36px rgba(15, 23, 42, 0.2);
    margin-top: auto;
    margin-bottom: auto;
}

.course-top-price {
    margin-bottom: 12px;
}

.course-top-price .now {
    font-size: 34px;
    color: #2563eb;
    font-weight: 800;
    margin-right: 8px;
}

.course-top-price .old {
    font-size: 15px;
    color: #94a3b8;
    text-decoration: line-through;
}

.course-top-btn {
    height: 38px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    font-weight: 700;
    margin-bottom: 20px;
}

.course-top-btn.enroll {
    background: #2563eb;
    color: #ffffff;
}

.course-top-btn.consult {
    border: 1px solid #cbd5e1;
    color: #475569;
    background: #ffffff;
}

.course-top-safe {
    margin-top: 6px;
    font-size: 12px;
    color: #64748b;
    text-align: center;
}

.course-main {
    padding: 16px 0 40px;
    background: #f3f5f8;
}

.course-layout {
    display: grid;
    grid-template-columns: 1fr 370px;
    gap: 16px;
    align-items: start;
}

.course-main-left {
    min-width: 0;
}

.course-panel {
    background: #ffffff;
    border: 1px solid #e5e7eb;
    border-radius: 12px;
    padding: 14px;
    margin-bottom: 12px;
}

.course-panel-title {
    font-size: 18px;
    color: #0f172a;
    font-weight: 800;
    margin-bottom: 14px;
}

.course-intro-text {
    color: #334155;
    font-size: 16px;
    line-height: 1.8;
}

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

.course-highlight-item {
    background: #f1f5f9;
    border-radius: 8px;
    padding: 12px 14px;
    color: #1f2937;
    font-size: 16px;
    line-height: 1.6;
    display: flex;
    align-items: flex-start;
    gap: 10px;
}

.course-highlight-item::before {
    content: "";
    width: 18px;
    height: 18px;
    flex: 0 0 18px;
    margin-top: 3px;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='18' height='18' viewBox='0 0 18 18'%3E%3Ccircle cx='9' cy='9' r='9' fill='%232563eb'/%3E%3Cpath d='M5 9.3L7.5 11.7L13 6.3' fill='none' stroke='%23fff' stroke-width='1.8' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-size: 18px 18px;
}

.course-outline-list {
    margin: 0;
    padding: 0;
}

.course-outline-item {
    display: grid;
    grid-template-columns: 28px 1fr auto;
    gap: 12px;
    align-items: center;
    background: #f8fafc;
    border: 1px solid #edf2f7;
    border-radius: 10px;
    padding: 12px 14px;
    margin-bottom: 10px;
}

.course-outline-item .idx {
    width: 24px;
    height: 24px;
    border-radius: 8px;
    background: #dbeafe;
    color: #2563eb;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 13px;
    font-weight: 700;
}

.course-outline-item .txt p {
    font-size: 16px;
    color: #0f172a;
    margin: 0 0 4px;
}

.course-outline-item .txt small {
    font-size: 14px;
    color: #64748b;
}

.course-outline-item .dur {
    font-size: 13px;
    color: #64748b;
    white-space: nowrap;
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.course-outline-item .dur::before {
    content: "\25B7";
    font-size: 12px;
    color: #94a3b8;
}

.course-main-right .course-panel.side {
    padding: 12px;
}

.course-side-title {
    font-size: 16px;
    font-weight: 800;
    margin-bottom: 10px;
}

.course-side-item {
    display: grid;
    grid-template-columns: 92px 1fr;
    gap: 10px;
    background: #f8fafc;
    border-radius: 8px;
    padding: 6px;
    margin-bottom: 8px;
}

.course-side-item img {
    width: 92px;
    height: 56px;
    border-radius: 6px;
    object-fit: cover;
}

.course-side-item .info p {
    margin: 0 0 4px;
    font-size: 14px;
    color: #0f172a;
    font-weight: 700;
    line-height: 1.4;
}

.course-side-item .info span {
    font-size: 12px;
    color: #64748b;
}