.catalog-hero {
    padding: 95px 0 70px;
    border-bottom: 1px solid var(--surface-border);
    background:
        radial-gradient(
            circle at 85% 10%,
            rgba(38, 243, 154, 0.12),
            transparent 30%
        ),
        radial-gradient(
            circle at 10% 10%,
            rgba(53, 199, 255, 0.1),
            transparent 30%
        );
}

.catalog-hero-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.15fr) minmax(290px, 0.85fr);
    align-items: center;
    gap: 60px;
}

.catalog-hero h1,
.course-detail-hero h1 {
    font-size: clamp(42px, 6vw, 70px);
    line-height: 1.04;
    letter-spacing: -0.05em;
}

.catalog-hero h1 span,
.course-detail-hero h1 span {
    color: var(--primary);
}

.catalog-hero-description {
    max-width: 720px;
    margin-top: 22px;
    color: var(--text-soft);
    font-size: 18px;
}

.catalog-summary {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 14px;
}

.catalog-summary-card {
    padding: 22px;
    border: 1px solid var(--surface-border);
    border-radius: var(--radius-medium);
    background: rgba(13, 26, 43, 0.82);
}

.catalog-summary-card strong {
    display: block;
    color: var(--primary);
    font-size: 30px;
    line-height: 1;
}

.catalog-summary-card span {
    display: block;
    margin-top: 9px;
    color: var(--text-muted);
    font-size: 13px;
    font-weight: 700;
}

.catalog-section {
    padding: 75px 0 100px;
}

.catalog-toolbar {
    margin-bottom: 36px;
    padding: 22px;
    border: 1px solid var(--surface-border);
    border-radius: var(--radius-medium);
    background: rgba(13, 26, 43, 0.75);
}

.catalog-form {
    display: grid;
    grid-template-columns: minmax(220px, 1.5fr) 1fr 1fr auto;
    gap: 12px;
}

.form-control {
    width: 100%;
    min-height: 48px;
    padding: 0 15px;
    border: 1px solid var(--surface-border);
    border-radius: 11px;
    outline: none;
    background: #081321;
    color: var(--text);
    transition:
        border-color 0.2s ease,
        box-shadow 0.2s ease;
}

.form-control:focus {
    border-color: rgba(38, 243, 154, 0.55);
    box-shadow: 0 0 0 4px rgba(38, 243, 154, 0.08);
}

.form-control::placeholder {
    color: var(--text-muted);
}

select.form-control {
    cursor: pointer;
}

.catalog-result-heading {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: 20px;
    margin-bottom: 25px;
}

.catalog-result-heading h2 {
    font-size: clamp(28px, 4vw, 40px);
    letter-spacing: -0.035em;
}

.catalog-result-heading p {
    color: var(--text-muted);
}

.catalog-course-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 22px;
}

.catalog-course-card {
    display: flex;
    flex-direction: column;
    min-width: 0;
    border: 1px solid var(--surface-border);
    border-radius: var(--radius-medium);
    background: var(--surface);
    overflow: hidden;
    transition:
        transform 0.25s ease,
        border-color 0.25s ease,
        box-shadow 0.25s ease;
}

.catalog-course-card:hover {
    transform: translateY(-7px);
    border-color: rgba(38, 243, 154, 0.32);
    box-shadow: var(--shadow);
}

.catalog-course-image {
    position: relative;
    height: 205px;
    background:
        radial-gradient(
            circle at 80% 20%,
            rgba(38, 243, 154, 0.27),
            transparent 35%
        ),
        linear-gradient(
            135deg,
            #132d48,
            #091522
        );
    overflow: hidden;
}

.catalog-course-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.catalog-course-image::after {
    content: "";
    position: absolute;
    inset: 0;
    background:
        linear-gradient(
            to top,
            rgba(5, 11, 20, 0.78),
            transparent 60%
        );
    pointer-events: none;
}

.catalog-course-code {
    position: absolute;
    right: 20px;
    bottom: 14px;
    z-index: 2;
    color: rgba(255, 255, 255, 0.2);
    font-size: 65px;
    font-weight: 900;
    line-height: 1;
}

.catalog-badge {
    position: absolute;
    top: 15px;
    z-index: 3;
    padding: 7px 10px;
    border: 1px solid rgba(38, 243, 154, 0.3);
    border-radius: 999px;
    background: rgba(5, 11, 20, 0.85);
    color: var(--primary);
    font-size: 10px;
    font-weight: 900;
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

.catalog-badge-left {
    left: 15px;
}

.catalog-badge-right {
    right: 15px;
    color: #9ce5ff;
    border-color: rgba(53, 199, 255, 0.3);
}

.catalog-course-body {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: 23px;
}

.catalog-course-category {
    color: var(--secondary);
    font-size: 11px;
    font-weight: 900;
    letter-spacing: 0.09em;
    text-transform: uppercase;
}

.catalog-course-body h3 {
    margin-top: 8px;
    font-size: 22px;
    line-height: 1.25;
}

.catalog-course-body h3 a {
    text-decoration: none;
}

.catalog-course-body h3 a:hover {
    color: var(--primary);
}

.catalog-course-description {
    margin-top: 12px;
    color: var(--text-muted);
    font-size: 14px;
}

.catalog-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 18px;
}

.catalog-meta span {
    padding: 6px 9px;
    border-radius: 8px;
    background: rgba(148, 163, 184, 0.08);
    color: var(--text-soft);
    font-size: 11px;
    font-weight: 800;
}

.catalog-card-bottom {
    margin-top: auto;
    padding-top: 22px;
}

.catalog-price {
    margin-bottom: 15px;
}

.catalog-price small {
    display: block;
    color: var(--text-muted);
    font-size: 10px;
    font-weight: 900;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.catalog-price strong {
    color: var(--primary);
    font-size: 27px;
    letter-spacing: -0.03em;
}

.catalog-actions {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 9px;
}

.catalog-empty {
    grid-column: 1 / -1;
    padding: 60px 30px;
    border: 1px dashed rgba(148, 163, 184, 0.28);
    border-radius: var(--radius-medium);
    text-align: center;
}

.catalog-empty h3 {
    font-size: 25px;
}

.catalog-empty p {
    margin-top: 9px;
    color: var(--text-muted);
}

.pagination {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 8px;
    margin-top: 40px;
}

.pagination a,
.pagination span {
    min-width: 42px;
    height: 42px;
    display: grid;
    place-items: center;
    padding: 0 12px;
    border: 1px solid var(--surface-border);
    border-radius: 10px;
    background: var(--surface);
    color: var(--text-soft);
    font-size: 13px;
    font-weight: 800;
    text-decoration: none;
}

.pagination a:hover,
.pagination .current {
    border-color: rgba(38, 243, 154, 0.4);
    background: var(--primary-soft);
    color: var(--primary);
}

.course-detail-hero {
    padding: 85px 0 70px;
    border-bottom: 1px solid var(--surface-border);
    background:
        radial-gradient(
            circle at 85% 15%,
            rgba(38, 243, 154, 0.12),
            transparent 30%
        );
}

.course-detail-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.15fr) minmax(340px, 0.85fr);
    align-items: start;
    gap: 55px;
}

.breadcrumbs {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 20px;
    color: var(--text-muted);
    font-size: 13px;
}

.breadcrumbs a {
    color: var(--secondary);
    text-decoration: none;
}

.course-detail-description {
    max-width: 760px;
    margin-top: 22px;
    color: var(--text-soft);
    font-size: 18px;
}

.course-detail-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 9px;
    margin-top: 25px;
}

.course-detail-tags span {
    padding: 8px 11px;
    border: 1px solid var(--surface-border);
    border-radius: 9px;
    background: rgba(148, 163, 184, 0.06);
    color: var(--text-soft);
    font-size: 12px;
    font-weight: 800;
}

.enrollment-card {
    position: sticky;
    top: 110px;
    padding: 27px;
    border: 1px solid rgba(38, 243, 154, 0.22);
    border-radius: var(--radius-large);
    background:
        linear-gradient(
            145deg,
            rgba(19, 34, 56, 0.96),
            rgba(8, 19, 33, 0.96)
        );
    box-shadow: var(--shadow);
}

.enrollment-image {
    height: 210px;
    margin: -12px -12px 22px;
    border-radius: 18px;
    background:
        radial-gradient(
            circle at 75% 20%,
            rgba(38, 243, 154, 0.25),
            transparent 35%
        ),
        linear-gradient(
            135deg,
            #153451,
            #091522
        );
    overflow: hidden;
}

.enrollment-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.enrollment-price small {
    display: block;
    color: var(--text-muted);
    font-size: 11px;
    font-weight: 900;
    text-transform: uppercase;
}

.enrollment-price strong {
    color: var(--primary);
    font-size: 38px;
    letter-spacing: -0.04em;
}

.enrollment-features {
    display: grid;
    gap: 11px;
    margin: 22px 0;
    list-style: none;
}

.enrollment-features li {
    position: relative;
    padding-left: 25px;
    color: var(--text-soft);
    font-size: 14px;
}

.enrollment-features li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--primary);
    font-weight: 900;
}

.enrollment-help {
    margin-top: 15px;
    color: var(--text-muted);
    font-size: 12px;
    text-align: center;
}

.course-content-section {
    padding: 80px 0 100px;
}

.course-content-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 300px;
    align-items: start;
    gap: 45px;
}

.course-information {
    display: grid;
    gap: 24px;
}

.course-information-card {
    padding: 30px;
    border: 1px solid var(--surface-border);
    border-radius: var(--radius-medium);
    background: var(--surface);
}

.course-information-card h2 {
    font-size: 27px;
    letter-spacing: -0.025em;
}

.course-information-card p {
    margin-top: 14px;
    color: var(--text-soft);
}

.rich-list {
    display: grid;
    gap: 11px;
    margin-top: 18px;
    list-style: none;
}

.rich-list li {
    position: relative;
    padding-left: 26px;
    color: var(--text-soft);
}

.rich-list li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--primary);
    font-weight: 900;
}

.syllabus-list {
    display: grid;
    gap: 10px;
    margin-top: 18px;
    counter-reset: syllabus;
    list-style: none;
}

.syllabus-list li {
    position: relative;
    padding: 14px 16px 14px 55px;
    border: 1px solid var(--surface-border);
    border-radius: 11px;
    background: rgba(255, 255, 255, 0.025);
    color: var(--text-soft);
    counter-increment: syllabus;
}

.syllabus-list li::before {
    content: counter(syllabus);
    position: absolute;
    top: 11px;
    left: 14px;
    width: 29px;
    height: 29px;
    display: grid;
    place-items: center;
    border-radius: 8px;
    background: var(--primary-soft);
    color: var(--primary);
    font-size: 11px;
    font-weight: 900;
}

.course-sidebar {
    display: grid;
    gap: 18px;
}

.sidebar-card {
    padding: 24px;
    border: 1px solid var(--surface-border);
    border-radius: var(--radius-medium);
    background: var(--surface);
}

.sidebar-card h3 {
    font-size: 19px;
}

.sidebar-card p {
    margin-top: 10px;
    color: var(--text-muted);
    font-size: 14px;
}

.sidebar-detail-list {
    display: grid;
    gap: 12px;
    margin-top: 17px;
}

.sidebar-detail {
    display: flex;
    justify-content: space-between;
    gap: 15px;
    padding-bottom: 11px;
    border-bottom: 1px solid var(--surface-border);
    font-size: 13px;
}

.sidebar-detail:last-child {
    padding-bottom: 0;
    border-bottom: 0;
}

.sidebar-detail span {
    color: var(--text-muted);
}

.sidebar-detail strong {
    color: var(--text-soft);
    text-align: right;
}

.related-section {
    padding: 75px 0 100px;
    border-top: 1px solid var(--surface-border);
    background: rgba(8, 19, 33, 0.7);
}

@media (max-width: 1000px) {
    .catalog-course-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .catalog-form {
        grid-template-columns: 1fr 1fr;
    }

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

    .enrollment-card {
        position: static;
    }

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

@media (max-width: 760px) {
    .catalog-hero-grid {
        grid-template-columns: 1fr;
    }

    .catalog-summary {
        max-width: 500px;
    }

    .catalog-result-heading {
        display: block;
    }

    .catalog-result-heading p {
        margin-top: 8px;
    }
}

@media (max-width: 650px) {
    .catalog-hero {
        padding: 65px 0 55px;
    }

    .catalog-section {
        padding: 55px 0 75px;
    }

    .catalog-form,
    .catalog-course-grid,
    .catalog-actions,
    .catalog-summary,
    .course-sidebar {
        grid-template-columns: 1fr;
    }

    .course-detail-hero {
        padding: 60px 0 50px;
    }

    .course-information-card {
        padding: 23px;
    }
}