/* =============================================
   SECTION 4 — COURSE EXPLORER
   ============================================= */

.explorer-section {
    padding: 70px 0;
    background: #fff;
}

/* Filter bar */
.filter-bar {
    display: flex;
    align-items: flex-end;
    gap: 18px;
    flex-wrap: wrap;
    background: #f9f9ff;
    border: 1px solid rgba(43, 10, 125, 0.1);
    border-radius: 14px;
    padding: 20px 24px;
    margin-bottom: 14px;
}

.filter-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
    flex: 1;
    min-width: 160px;
}

.filter-group label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--primary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.form-select-custom {
    padding: 10px 14px;
    border-radius: 8px;
    border: 1.5px solid #e0d9f8;
    font-size: 0.88rem;
    font-family: inherit;
    color: #333;
    background: white;
    outline: none;
    cursor: pointer;
    transition: border 0.2s;
}

.form-select-custom:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(43, 10, 125, 0.1);
}

.filter-reset-group {
    flex: 0 0 auto;
}

.btn-filter-reset {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 10px 16px;
    background: transparent;
    border: 1.5px dashed rgba(43, 10, 125, 0.3);
    border-radius: 8px;
    color: var(--primary);
    font-size: 0.82rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    font-family: inherit;
}

.btn-filter-reset:hover {
    background: rgba(43, 10, 125, 0.05);
    border-color: var(--primary);
}

.micro-helper {
    font-size: 0.78rem;
    color: var(--text-muted);
    margin-bottom: 30px;
}

.micro-helper i { color: var(--primary); }

/* Course grid */
.course-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.explorer-section .transition-box {
    margin-top: 36px;
}

/* Course card */
.course-card {
    background: #fff;
    border-radius: 18px;
    overflow: hidden;
    border: 1px solid #f0f0f0;
    box-shadow: 0 4px 16px rgba(0,0,0,0.04);
    transition: all 0.35s cubic-bezier(0.165, 0.84, 0.44, 1);
    display: flex;
    flex-direction: column;
}

.course-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 45px rgba(43, 10, 125, 0.1);
    border-color: rgba(43, 10, 125, 0.15);
}

/* Card banner / image */
.card-banner {
    position: relative;
    height: 180px;
    overflow: hidden;
}

.card-banner img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}

.course-card:hover .card-banner img {
    transform: scale(1.04);
}

/* Placement tag over banner */
.placement-tag {
    position: absolute;
    top: 12px;
    left: 12px;
    padding: 5px 10px;
    border-radius: 20px;
    font-size: 0.68rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 5px;
}

.tag-guaranteed {
    background: #dcfce7;
    color: #15803d;
    border: 1px solid #86efac;
}

.tag-assistance {
    background: #eff6ff;
    color: #1d4ed8;
    border: 1px solid #93c5fd;
}

/* Card body */
.card-body-custom {
    padding: 20px;
    display: flex;
    flex-direction: column;
    flex: 1;
}

.card-domain-tag {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    font-size: 0.68rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    padding: 3px 10px;
    border-radius: 4px;
    background: rgba(43, 10, 125, 0.07);
    color: var(--primary);
    margin-bottom: 10px;
    width: fit-content;
}

.card-title-custom {
    font-size: 0.98rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 10px;
    line-height: 1.4;
}

.card-meta {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 14px;
    flex-wrap: wrap;
}

.meta-item {
    display: flex;
    align-items: center;
    gap: 5px;
    font-size: 0.78rem;
    color: var(--text-muted);
    font-weight: 500;
}

.meta-item i { color: var(--primary); font-size: 0.82rem; }

.cert-logos {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 16px;
    flex-wrap: wrap;
}

.cert-logo-item {
    font-size: 0.7rem;
    font-weight: 600;
    padding: 3px 8px;
    background: #f8f5ff;
    color: var(--primary);
    border-radius: 4px;
    border: 1px solid rgba(43, 10, 125, 0.15);
}

.card-footer-custom {
    margin-top: auto;
    padding-top: 14px;
    border-top: 1px solid #f0f0f0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
}

.card-cta-btn {
    flex: 1;
    padding: 10px 14px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 0.82rem;
    font-weight: 700;
    cursor: pointer;
    text-align: center;
    transition: all 0.3s;
    text-decoration: none;
    display: block;
}

.card-cta-btn:hover {
    background: #1e0758;
    color: white;
}

.card-cta-secondary {
    padding: 10px 14px;
    background: transparent;
    color: var(--primary);
    border: 1.5px solid var(--primary);
    border-radius: 8px;
    font-size: 0.82rem;
    font-weight: 700;
    cursor: pointer;
    white-space: nowrap;
    transition: all 0.3s;
    text-decoration: none;
}

.card-cta-secondary:hover {
    background: var(--primary);
    color: white;
}

/* Responsive */
@media (max-width: 991px) {
    .course-grid { grid-template-columns: repeat(2, 1fr); }
    .filter-bar  { padding: 16px; }
}

@media (max-width: 640px) {
    .course-grid { grid-template-columns: 1fr; }
    .filter-group { min-width: 100%; }
    .explorer-section .transition-box { margin-top: 26px; }
}