body.course-page {
    --course-bg: #e8edf8;
    --course-surface: rgba(255, 255, 255, 0.93);
    --course-ink: #07143f;
    --course-ink-soft: #394a6f;
    --course-accent: #001050;
    --course-accent-warm: #e99a1f;
    --course-gold: #f0b030;
    --course-border: rgba(0, 16, 80, 0.18);
    --course-shadow: 0 20px 46px rgba(0, 16, 80, 0.12);
    background:
        radial-gradient(circle at 14% 4%, rgba(240, 176, 48, 0.08), transparent 26%),
        radial-gradient(circle at 90% 12%, rgba(47, 111, 208, 0.08), transparent 28%),
        #f4f6f8;
}

.course-hero,
.course-card {
    border-color: rgba(0, 16, 80, 0.14);
    background:
        radial-gradient(circle at top right, rgba(240, 176, 48, 0.16), transparent 34%),
        linear-gradient(135deg, rgba(255, 255, 255, 0.98), rgba(245, 248, 255, 0.94));
}

.course-section-title {
    color: var(--course-accent);
}

.course-hero::before {
    background: linear-gradient(90deg, #1d5fbf, #4f8fe8, #f2a51f);
}

.course-hero-image {
    box-shadow:
        0 14px 26px rgba(0, 16, 80, 0.14),
        0 4px 10px rgba(240, 176, 48, 0.1);
    filter: drop-shadow(0 8px 12px rgba(0, 16, 80, 0.08));
}

.course-hero-cta-group {
    position: absolute;
    top: 18px;
    right: 22px;
    z-index: 1;
    display: flex;
    flex-wrap: wrap;
    max-width: calc(100% - 44px);
    justify-content: flex-end;
    gap: 10px;
}

.course-hero-cta {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 1px solid rgba(255, 255, 255, 0.58);
    border-radius: 999px;
    background: linear-gradient(135deg, #174ea6, #2f6fd0);
    color: #fff;
    box-shadow: 0 8px 18px rgba(0, 16, 80, 0.12);
    font-family: var(--course-sans);
    font-size: 0.9rem;
    font-weight: 800;
    letter-spacing: 0.01em;
    padding: 10px 16px;
    text-decoration: none;
    transition: background 0.18s ease, color 0.18s ease, transform 0.18s ease, box-shadow 0.18s ease;
}

.course-hero-cta:hover,
.course-hero-cta:focus-visible {
    background: linear-gradient(135deg, #f2a51f, #f6c453);
    color: #07143f;
    box-shadow: 0 10px 20px rgba(0, 16, 80, 0.14);
    outline: none;
    transform: translateY(-1px);
}

.course-chip,
.course-resource-card {
    border-color: rgba(0, 16, 80, 0.14);
    background: rgba(255, 255, 255, 0.9);
}

@media (min-width: 961px) {
    .course-hero {
        gap: 20px;
        padding: 30px 36px;
    }

    .course-hero-top {
        gap: 22px;
        padding-top: 42px;
    }

    .course-hero-image {
        width: min(100%, 230px);
    }

    .course-summary {
        margin-top: 16px;
        line-height: 1.55;
    }

    .course-meta-grid {
        margin-top: 16px;
    }
}

.course-hero-meta-full .course-meta-item:nth-child(1) {
    border-color: rgba(72, 120, 190, 0.16);
    background: rgba(235, 243, 255, 0.86);
}

.course-hero-meta-full .course-meta-item:nth-child(2) {
    border-color: rgba(54, 138, 101, 0.16);
    background: rgba(235, 248, 240, 0.86);
}

.course-hero-meta-full .course-meta-item:nth-child(3) {
    border-color: rgba(184, 135, 35, 0.17);
    background: rgba(255, 247, 224, 0.88);
}

.course-hero-meta-full .course-meta-item:nth-child(4) {
    border-color: rgba(125, 83, 164, 0.15);
    background: rgba(247, 239, 252, 0.86);
}

.course-hero-meta-full .course-meta-item {
    display: grid;
    grid-template-columns: 20px minmax(0, 1fr);
    align-items: start;
    gap: 10px;
}

.course-meta-icon {
    width: 19px;
    height: 19px;
    margin-top: 1px;
    fill: none;
    stroke: currentColor;
    stroke-width: 1.8;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.course-hero-meta-full .course-meta-item:nth-child(1) .course-meta-icon {
    color: #3568a8;
}

.course-hero-meta-full .course-meta-item:nth-child(2) .course-meta-icon {
    color: #28744f;
}

.course-hero-meta-full .course-meta-item:nth-child(3) .course-meta-icon {
    color: #9b6b13;
}

.course-hero-meta-full .course-meta-item:nth-child(4) .course-meta-icon {
    color: #76509a;
}

.course-meta-copy {
    min-width: 0;
}

.course-meta-links {
    display: flex;
    flex-wrap: wrap;
    gap: 2px 8px;
    align-items: baseline;
}

.course-panel {
    border: 1px solid rgba(0, 16, 80, 0.14);
    border-radius: 20px;
    background:
        linear-gradient(135deg, rgba(255, 255, 255, 0.98) 0%, rgba(246, 249, 255, 0.94) 100%);
    box-shadow: 0 16px 32px rgba(0, 16, 80, 0.08);
}

.course-student-intro {
    margin: 0 0 26px;
    padding: 2px 4px 24px;
    border-bottom: 1px solid rgba(0, 16, 80, 0.13);
    color: var(--course-ink-soft);
}

.course-student-intro h3 {
    margin: 0 0 12px;
    color: var(--course-accent);
    font-size: 1.35rem;
    font-weight: 750;
}

.course-student-intro h4 {
    max-width: 78ch;
    margin: 24px 0 10px;
    color: var(--course-ink);
    font-size: 1.05rem;
    font-weight: 750;
}

.course-student-question {
    max-width: 68ch;
    margin: 22px 0 26px;
    padding: 16px 20px;
    border-left: 4px solid #f2a51f;
    background: rgba(242, 165, 31, 0.1);
    color: var(--course-accent);
    font-size: 1.08rem;
    font-weight: 750;
    line-height: 1.55;
}

.course-student-intro p {
    max-width: 78ch;
    margin: 0;
    font-size: 1rem;
    line-height: 1.72;
}

.course-student-intro p + p {
    margin-top: 12px;
}

.course-student-intro code {
    font-family: Menlo, Consolas, "Liberation Mono", monospace;
    font-size: 0.92em;
}

.course-student-intro-close {
    color: var(--course-accent);
    font-weight: 750;
}

.course-panel::before {
    content: none;
}

.course-panel::after {
    content: none;
}

.course-panel-summary {
    padding: 18px 20px 14px 24px;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 10px 12px;
}

.course-panel-topline {
    flex: 0 0 auto;
}

.course-panel-title-row {
    flex: 1 1 520px;
    min-width: 0;
    align-items: center;
}

.course-panel-range {
    display: inline-flex;
    align-items: center;
    padding: 6px 12px;
    border: 1px solid rgba(255, 255, 255, 0.52);
    border-radius: 999px;
    background: linear-gradient(135deg, var(--course-accent), #102070);
    color: #fff;
    box-shadow: 0 8px 18px rgba(0, 16, 80, 0.16);
}

.course-panel-title {
    color: #203544;
    font-size: 1.22rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.course-panel-content {
    padding: 22px 20px 22px 24px;
    border-top-color: rgba(17, 36, 52, 0.1);
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.58), rgba(255, 255, 255, 0.2));
}

.course-subtopic {
    margin: 0 0 14px;
    font-size: 0.9rem;
    font-weight: 800;
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

.course-lecture-list {
    padding-left: 32px;
}

.course-lecture-list::before {
    content: none;
}

.course-lecture-list li {
    padding-left: 16px;
}

.course-lecture-list li::before {
    z-index: 2;
    left: -32px;
    top: 0.54em;
    width: 16px;
    height: 16px;
    background: #f8faff;
    border: 3px solid var(--course-accent);
    box-shadow: 0 0 0 4px rgba(0, 16, 80, 0.08), 0 4px 10px rgba(0, 16, 80, 0.12);
}

.course-lecture-list li:not(:last-child)::after {
    content: "";
    position: absolute;
    z-index: 1;
    left: -23px;
    top: calc(0.54em + 8px);
    bottom: calc(-10px - 0.54em - 8px);
    width: 2px;
    border-radius: 999px;
    background: linear-gradient(180deg, rgba(0, 16, 80, 0.34), rgba(240, 176, 48, 0.28));
}

.cs2300-book-group + .cs2300-book-group {
    margin-top: 34px;
}

.cs2300-book-heading {
    margin: 0 0 14px;
    color: var(--course-accent);
    font-size: 1.12rem;
    font-weight: 800;
    letter-spacing: 0.02em;
    text-transform: uppercase;
}

.cs2300-book-disclosure {
    border: 1px solid rgba(0, 16, 80, 0.12);
    border-radius: 18px;
    background: rgba(255, 255, 255, 0.56);
    padding: 14px;
}

.cs2300-book-disclosure .cs2300-book-heading {
    display: flex;
    align-items: center;
    justify-content: space-between;
    cursor: pointer;
    list-style: none;
    margin-bottom: 0;
}

.cs2300-book-disclosure .cs2300-book-heading::-webkit-details-marker {
    display: none;
}

.cs2300-book-disclosure .cs2300-book-heading::after {
    content: "Show";
    padding: 5px 10px;
    border-radius: 999px;
    background: rgba(0, 16, 80, 0.08);
    color: var(--course-accent);
    font-size: 0.78rem;
    font-weight: 800;
    letter-spacing: 0.02em;
    text-transform: uppercase;
}

.cs2300-book-disclosure[open] .cs2300-book-heading {
    margin-bottom: 14px;
}

.cs2300-book-disclosure[open] .cs2300-book-heading::after {
    content: "Hide";
}

.cs2300-book-grid {
    display: grid;
    gap: 18px;
}

.cs2300-book-grid--primary {
    width: 90%;
    margin-inline: auto;
    grid-template-columns: repeat(4, minmax(0, 1fr));
}

.cs2300-book-grid--extra {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 16px;
}

.cs2300-book-card {
    display: grid;
    gap: 10px;
    padding: 8px;
    border: 1px solid rgba(0, 16, 80, 0.12);
    border-radius: 18px;
    background:
        linear-gradient(180deg, rgba(255, 255, 255, 0.94), rgba(246, 249, 255, 0.9));
    box-shadow: 0 12px 26px rgba(0, 16, 80, 0.07);
}

.cs2300-book-card--primary {
    padding: 12px;
    box-shadow: 0 16px 32px rgba(17, 32, 46, 0.09);
}

a.cs2300-book-card {
    text-decoration: none;
    color: inherit;
    transition: transform 0.18s ease, box-shadow 0.18s ease;
}

a.cs2300-book-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 20px 38px rgba(0, 16, 80, 0.16);
}

a.cs2300-book-card:hover .cs2300-book-title {
    text-decoration: underline;
}

.cs2300-book-thumb {
    position: relative;
    display: grid;
    min-height: 0;
    aspect-ratio: 0.72;
    overflow: hidden;
    border-radius: 14px;
    background: #eef3fc;
    box-shadow: inset 0 0 0 1px rgba(0, 16, 80, 0.08);
}

.cs2300-book-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.cs2300-book-card--primary .cs2300-book-thumb {
    border-radius: 16px;
}

.cs2300-book-meta {
    display: grid;
    gap: 4px;
}

.cs2300-book-title {
    margin: 0;
    color: var(--course-ink);
    font-size: 0.98rem;
    font-weight: 750;
    line-height: 1.25;
}

.cs2300-book-card--primary .cs2300-book-title {
    font-size: 1.08rem;
}

.cs2300-book-author {
    margin: 0;
    color: var(--course-ink-soft);
    font-size: 0.84rem;
    line-height: 1.35;
}

.course-tara-teaser {
    padding: 18px;
    border-radius: 16px;
    background: #fff;
}

@media (max-width: 960px) {
    .course-hero-cta-group {
        position: static;
        max-width: none;
        justify-content: flex-start;
        margin-bottom: 18px;
    }

    .cs2300-book-grid--primary,
    .cs2300-book-grid--extra {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 560px) {
    .cs2300-book-grid--primary,
    .cs2300-book-grid--extra {
        grid-template-columns: 1fr;
    }

}

.course-tabs-card {
    padding: 0;
    overflow: visible;
}

.course-tabs-head {
    position: relative;
    z-index: 2;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    padding: 18px;
    border-bottom: 1px solid rgba(0, 16, 80, 0.1);
    background:
        linear-gradient(90deg, rgba(0, 16, 80, 0.08), rgba(240, 176, 48, 0.14));
}

.course-tabs-list,
.course-tab-buttons,
.course-tab-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.course-tabs-list {
    flex: 1 1 520px;
}

.course-tab-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.course-tab-actions {
    flex: 0 1 auto;
}

.course-tab-button,
.course-tab-link {
    appearance: none;
    border: 1px solid rgba(0, 16, 80, 0.16);
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.74);
    color: var(--course-ink);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font: inherit;
    font-family: var(--course-sans);
    font-size: 0.98rem;
    font-weight: 700;
    padding: 10px 16px;
    text-decoration: none;
    transition: background 0.18s ease, border-color 0.18s ease, color 0.18s ease;
}

.course-lab-select {
    position: relative;
    display: inline-flex;
}

.course-document-menu {
    position: relative;
}

.course-document-trigger {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    border: 1px solid rgba(0, 16, 80, 0.16);
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.74);
    color: var(--course-ink);
    cursor: pointer;
    font-size: 0.98rem;
    font-weight: 700;
    padding: 10px 16px;
    list-style: none;
}

.course-document-trigger::-webkit-details-marker,
.course-book-menu > summary::-webkit-details-marker {
    display: none;
}

.course-document-trigger::after,
.course-book-menu > summary::after {
    width: 7px;
    height: 7px;
    border-right: 2px solid currentColor;
    border-bottom: 2px solid currentColor;
    content: "";
    transform: translateY(-2px) rotate(45deg);
    transition: transform 0.18s ease;
}

.course-document-menu[open] > .course-document-trigger::after,
.course-book-menu[open] > summary::after {
    transform: translateY(2px) rotate(225deg);
}

.course-document-trigger:hover,
.course-document-trigger:focus-visible {
    border-color: rgba(0, 16, 80, 0.34);
    outline: none;
}

.course-tara-menu.is-active > .course-document-trigger {
    background: linear-gradient(135deg, var(--course-accent), #102070);
    border-color: var(--course-accent);
    color: #fff;
}

.course-document-dropdown {
    position: absolute;
    top: calc(100% + 8px);
    left: 0;
    z-index: 10;
    width: 220px;
    padding: 6px;
    border: 1px solid rgba(0, 16, 80, 0.14);
    border-radius: 8px;
    background: #fff;
    box-shadow: 0 16px 34px rgba(0, 16, 80, 0.16);
}

.course-document-dropdown > button,
.course-document-dropdown > a,
.course-book-menu > summary,
.course-book-chapters button {
    appearance: none;
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    gap: 12px;
    border: 0;
    border-radius: 6px;
    background: transparent;
    color: var(--course-ink);
    cursor: pointer;
    font-family: inherit;
    font-size: 0.92rem;
    font-weight: 700;
    line-height: 1.3;
    padding: 10px 12px;
    text-align: left;
    text-decoration: none;
}

.course-document-dropdown > a:hover,
.course-document-dropdown > a:focus-visible,
.course-document-dropdown > button:hover,
.course-document-dropdown > button:focus-visible,
.course-book-menu > summary:hover,
.course-book-menu > summary:focus-visible,
.course-book-chapters button:hover,
.course-book-chapters button:focus-visible {
    background: rgba(23, 78, 166, 0.1);
    outline: none;
}

.course-book-menu > summary {
    list-style: none;
}

.course-book-chapters {
    display: grid;
    gap: 2px;
    margin-left: 12px;
    padding-left: 8px;
    border-left: 2px solid rgba(23, 78, 166, 0.16);
}

.course-book-chapters button {
    font-weight: 600;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.course-lab-select select {
    appearance: none;
    min-width: 112px;
    border: 1px solid rgba(0, 16, 80, 0.16);
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.74);
    color: var(--course-ink);
    cursor: pointer;
    font: inherit;
    font-family: var(--course-sans);
    font-size: 0.98rem;
    font-weight: 700;
    padding: 10px 38px 10px 16px;
}

.course-lab-select::after {
    position: absolute;
    top: 50%;
    right: 16px;
    width: 7px;
    height: 7px;
    border-right: 2px solid currentColor;
    border-bottom: 2px solid currentColor;
    content: "";
    pointer-events: none;
    transform: translateY(-70%) rotate(45deg);
}

.course-lab-select select:hover,
.course-lab-select select:focus-visible {
    border-color: rgba(0, 16, 80, 0.34);
    outline: none;
}

.course-tab-button:hover,
.course-tab-button:focus-visible,
.course-tab-link:hover,
.course-tab-link:focus-visible {
    border-color: rgba(0, 16, 80, 0.34);
    outline: none;
}

.course-tab-link {
    background: linear-gradient(135deg, #174ea6, #2f6fd0);
    border-color: rgba(255, 255, 255, 0.58);
    color: #fff;
}

.course-tab-link:hover,
.course-tab-link:focus-visible {
    background: linear-gradient(135deg, #f2a51f, #f6c453);
    color: #07143f;
}

.course-tab-button[aria-selected="true"] {
    background: linear-gradient(135deg, var(--course-accent), #102070);
    border-color: var(--course-accent);
    color: #fff;
    box-shadow: none;
}

.course-tab-panel {
    display: none;
    padding: 24px;
}

.course-tab-panel.is-active {
    display: block;
}

.course-pdf-panel {
    display: grid;
    gap: 16px;
}

.course-pdf-actions {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}

.course-pdf-actions .course-media-caption {
    flex: 1 1 320px;
}

.course-pdf-embed {
    width: 100%;
    min-height: min(78vh, 820px);
    border: 1px solid rgba(0, 16, 80, 0.14);
    border-radius: 22px;
    background: #fff;
    box-shadow: 0 18px 40px rgba(0, 16, 80, 0.12);
}

.course-page-footer {
    position: relative;
    width: min(100% - 48px, 1040px);
    margin: 34px auto 0;
    padding: 24px 28px;
    border: 1px solid rgba(0, 16, 80, 0.12);
    border-radius: 28px 28px 0 0;
    background:
        radial-gradient(circle at 14% 0%, rgba(240, 176, 48, 0.2), transparent 34%),
        linear-gradient(135deg, rgba(255, 255, 255, 0.9), rgba(236, 242, 255, 0.94));
    box-shadow: 0 -6px 20px rgba(0, 16, 80, 0.05);
    color: var(--course-ink-soft);
    font-family: var(--course-sans);
    overflow: hidden;
}

.course-page-footer::before {
    content: "";
    position: absolute;
    inset: 0 0 auto;
    height: 4px;
    background: linear-gradient(90deg, #1d5fbf, #4f8fe8, #f2a51f);
}

.course-footer-inner {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 14px 24px;
}

.course-footer-brand {
    display: grid;
    gap: 4px;
}

.course-footer-title {
    margin: 0;
    color: var(--course-accent);
    font-size: 1rem;
    font-weight: 800;
}

.course-footer-copy {
    margin: 0;
    font-size: 0.94rem;
    line-height: 1.5;
}

.course-footer-logo {
    display: block;
    width: clamp(58px, 8vw, 86px);
    height: auto;
    object-fit: contain;
    filter: drop-shadow(0 6px 10px rgba(0, 16, 80, 0.1));
}

.course-resource-card {
    border: 1px solid rgba(17, 36, 52, 0.1);
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.82);
    box-shadow: 0 8px 20px rgba(17, 32, 46, 0.05);
    padding: 18px;
}

.course-resource-card h4 {
    margin: 0 0 8px;
    color: var(--course-accent);
    font-size: 1.18rem;
    font-weight: 600;
    line-height: 1.18;
}

.course-resource-card p {
    margin: 0;
    color: var(--course-ink-soft);
    font-size: 1.04rem;
    line-height: 1.66;
}

.course-tara-layout {
    display: grid;
    gap: 22px;
}

.course-tara-teaser {
    display: grid;
    gap: 12px;
}

.course-tara-bottom {
    display: grid;
    grid-template-columns: minmax(0, 1.15fr) minmax(260px, 0.85fr);
    gap: 22px;
    align-items: start;
}

.course-tara-bottom .course-isa-table-wrap {
    margin-top: 0;
}

.course-resource-grid {
    display: grid;
    gap: 14px;
}

.course-resource-link {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    color: var(--course-ink);
    text-decoration: none;
}

.course-resource-link:hover h4 {
    color: var(--course-accent-warm);
}

.course-resource-icon {
    display: inline-grid;
    flex: 0 0 42px;
    width: 42px;
    height: 42px;
    place-items: center;
    border-radius: 8px;
    background: rgba(13, 92, 99, 0.1);
    color: var(--course-accent);
    font-family: var(--course-sans);
    font-weight: 600;
    font-size: 0.78rem;
}

.course-resource-copy h4 {
    font-family: var(--course-serif);
}

.course-video {
    width: 100%;
    aspect-ratio: 16 / 9;
    border-radius: 8px;
    background: #0f1d2a;
    box-shadow: 0 12px 28px rgba(17, 32, 46, 0.12);
}

.course-isa-table-wrap {
    margin-top: 18px;
    overflow-x: auto;
    border: 1px solid rgba(17, 36, 52, 0.14);
    border-radius: 8px;
    background: #fff;
}

.course-isa-table {
    width: 100%;
    border-collapse: collapse;
    color: var(--course-ink);
    font-size: 0.92rem;
    line-height: 1.45;
}

.course-isa-table caption {
    padding: 12px 14px;
    text-align: left;
    color: var(--course-accent);
    font-weight: 500;
}

.course-isa-table th,
.course-isa-table td {
    padding: 10px 12px;
    border-top: 1px solid rgba(17, 36, 52, 0.1);
    text-align: left;
    vertical-align: top;
}

.course-isa-table th {
    background: #f6f2ea;
    color: var(--course-ink);
    font-family: var(--course-sans);
    font-size: 0.78rem;
    font-weight: 600;
    letter-spacing: 0.03em;
    text-transform: uppercase;
}

.course-isa-table code {
    font-family: Menlo, Consolas, "Liberation Mono", monospace;
    font-size: 0.86rem;
    white-space: nowrap;
}

@media (max-width: 760px) {
    .course-tara-bottom {
        grid-template-columns: 1fr;
    }

    .course-tab-panel {
        padding: 18px;
    }

    .course-pdf-embed {
        min-height: 68vh;
        border-radius: 16px;
    }

    .course-hero-cta-group {
        position: static;
        margin-bottom: 18px;
    }

    .course-page-footer {
        width: min(100% - 24px, 1040px);
    }
}