/* COURSES SECTION */
.courses {
    background-color: var(--color-primary-dark);
    padding: var(--spacing-4xl) var(--spacing-lg);
}

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

.courses .section__title {
    color: var(--color-accent);
}

.courses__metrics {
    display: flex;
    justify-content: center;
    gap: var(--spacing-3xl);
    flex-wrap: wrap;
    margin-bottom: var(--spacing-4xl);
}

.courses__metric {
    text-align: center;
}

.courses__metric-value {
    font-family: var(--font-display);
    font-size: var(--font-size-4xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-white);
    margin-bottom: var(--spacing-sm);
    line-height: 1;
}

.courses__metric-label {
    font-size: var(--font-size-base);
    color: var(--color-white);
    opacity: 0.85;
    line-height: 1.4;
}

.courses__grid {
    display: grid;
    gap: var(--spacing-xl);
    margin-top: var(--spacing-2xl);
}

/* Timeline styles */
.courses__timeline {
    position: relative;
    padding: var(--spacing-lg) 0;
}

.courses__timeline::before {
    content: "";
    position: absolute;
    left: 40px;
    /* start the line a bit below the top so the first marker appears as a starting point */
    top: 36px;
    /* stop the line above the bottom to allow a finish icon */
    bottom: 48px;
    width: 4px;
    background: linear-gradient(180deg, var(--color-accent), rgba(255,255,255,0.06));
    border-radius: 4px;
}

.timeline-item {
    position: relative;
    padding: var(--spacing-lg) 0;
    display: flex;
    gap: var(--spacing-lg);
    align-items: flex-start;
}

.timeline-item__marker {
    width: 24px;
    height: 24px;
    background: var(--color-primary-dark);
    border: 4px solid var(--color-accent);
    border-radius: 50%;
    box-shadow: var(--shadow-sm);
    position: relative;
    z-index: 2;
    margin-left: 30px; /* align with vertical line */
}

/* First marker appears as a filled starting point */
.timeline-item:first-child .timeline-item__marker {
    background: var(--color-accent);
    border-color: var(--color-accent);
}

.timeline-item__content {
    flex: 1;
}

@media (min-width: var(--bp-md)) {
    .courses__timeline::before { left: 60px; top: 64px; bottom: 64px; }
    .timeline-item__marker { margin-left: 52px; }
    .timeline-item__content { margin-left: 24px; }
}

.timeline-end {
    position: absolute;
    left: 28px;
    bottom: 8px;
    z-index: 3;
    color: var(--color-accent);
    font-size: 1.4rem;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: linear-gradient(180deg, rgba(255,255,255,0.03), rgba(255,255,255,0.01));
    box-shadow: var(--shadow-sm);
}

@media (min-width: var(--bp-md)) {
    .timeline-end { left: 52px; }
}

.course-card {
    background-color: rgba(255, 255, 255, 0.05);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
    border-top: 4px solid var(--color-accent);
}

.course-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.course-card__title {
    font-family: var(--font-display);
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-accent);
    margin-bottom: var(--spacing-md);
    line-height: 1.3;
}

.course-card__description {
    font-size: var(--font-size-base);
    color: rgba(255, 255, 255, 0.85);
    margin-bottom: var(--spacing-lg);
    line-height: 1.6;
}

.course-card__topics {
    list-style: none;
    padding: 0;
}

.course-card__topics li {
    font-size: var(--font-size-base);
    color: rgba(255, 255, 255, 0.9);
    padding: var(--spacing-xs) 0;
    padding-left: var(--spacing-lg);
    position: relative;
    line-height: 1.5;
}

.course-card__topics li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--color-accent);
    font-weight: var(--font-weight-bold);
    font-size: var(--font-size-lg);
}

@media (min-width: var(--bp-md)) {
    .courses__grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: var(--bp-lg)) {
    .courses__grid {
        gap: var(--spacing-2xl);
    }
}