/* Shared commercial class cards: used by the public home and the virtual classroom. */
.class-catalog-grid {
    --class-card-blue: #4f7cff;
    --class-card-turquoise: #22d3ee;
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
}

.class-catalog-card {
    --class-card-color: var(--class-card-blue);
    position: relative;
    min-height: 350px;
    overflow: hidden;
    isolation: isolate;
    display: flex;
    align-items: stretch;
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 0.75rem;
    background: #020617;
    color: #fff;
    box-shadow: 0 12px 30px rgba(15, 23, 42, 0.16);
    transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

.class-catalog-card:hover {
    border-color: rgba(255, 255, 255, 0.3);
    box-shadow: 0 18px 36px rgba(15, 23, 42, 0.28);
    transform: translateY(-4px);
}

.class-catalog-card--blue { --class-card-color: var(--class-card-blue); }
.class-catalog-card--turquoise { --class-card-color: var(--class-card-turquoise); }

.class-catalog-card__gradient-top,
.class-catalog-card__gradient-bottom,
.class-catalog-card__noise {
    position: absolute;
    pointer-events: none;
}

.class-catalog-card__gradient-top {
    z-index: -1;
    top: 0;
    left: 0;
    width: 18rem;
    height: 18rem;
    border-radius: 999px;
    background: var(--class-card-color);
    filter: blur(4rem);
    opacity: 0.3;
    transform: translate(-35%, -35%);
}

.class-catalog-card__gradient-bottom {
    z-index: -1;
    inset: auto 0 0;
    height: 38%;
    background: linear-gradient(to top, var(--class-card-color), transparent);
    opacity: 0.24;
}

.class-catalog-card__noise {
    z-index: -1;
    inset: 0;
    opacity: 0.05;
    background-image: url('https://grainy-gradients.vercel.app/noise.svg');
}

.class-catalog-card__content {
    width: 100%;
    min-height: 350px;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    align-items: flex-start;
    padding: 1.5rem 2rem;
}

.class-catalog-card__tag {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    margin-bottom: 0.75rem;
    color: var(--class-card-color);
    font-size: 10px;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.class-catalog-card__tag::before {
    width: 0.55rem;
    height: 0.55rem;
    border-radius: 50%;
    background: currentColor;
    box-shadow: 0 0 0 4px color-mix(in srgb, currentColor 18%, transparent);
    content: "";
}

.class-catalog-card__title {
    max-width: 20ch;
    margin: 0 0 0.5rem;
    color: #fff;
    font: 700 1.5rem/1.25 "Raleway", system-ui, sans-serif;
}

.class-catalog-card__title span,
.class-catalog-card__title em {
    display: block;
}

.class-catalog-card__title em {
    margin-top: 0.2rem;
    color: var(--class-card-color);
    font: 600 italic 1rem/1.25 "Raleway", system-ui, sans-serif;
    letter-spacing: 0.01em;
}

.class-catalog-card__description {
    max-width: 42ch;
    min-height: 3.15em;
    margin: 0;
    color: #d1d5db;
    font-size: 0.875rem;
    line-height: 1.55;
}

.class-catalog-card__cta {
    min-height: 2.5rem;
    margin-top: 1.25rem;
    padding: 0 0.95rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.45rem;
    border: 1px solid color-mix(in srgb, var(--class-card-color) 70%, white);
    border-radius: 999px;
    background: rgba(2, 6, 23, 0.62);
    color: #fff;
    font-size: 0.78rem;
    font-weight: 800;
    text-decoration: none;
    transition: background 0.2s ease, color 0.2s ease, transform 0.2s ease;
}

.class-catalog-card__cta::after {
    content: "→";
    font-size: 1rem;
    line-height: 1;
}

.class-catalog-card__cta:hover {
    background: var(--class-card-color);
    color: #020617;
    transform: translateX(2px);
}

.class-catalog-card__cta:focus-visible {
    outline: 3px solid #fff;
    outline-offset: 3px;
}

@media (min-width: 768px) {
    .class-catalog-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 520px) {
    .class-catalog-card,
    .class-catalog-card__content { min-height: 320px; }
    .class-catalog-card__content { padding: 1.35rem; }
}