.join-cta-section {
    width: 100%;
    padding: 3.5rem 0 4rem;
    background:
        radial-gradient(900px 520px at 10% 18%, rgba(249,115,22,0.20), transparent 55%),
        radial-gradient(900px 520px at 92% 22%, rgba(20,184,166,0.18), transparent 58%),
        radial-gradient(1000px 600px at 50% 110%, rgba(59,130,246,0.10), transparent 60%),
        radial-gradient(circle at 0 0,#1f2937 0, #020617 55%);
    position: relative;
    overflow: hidden;
}

.join-cta-section::before {
    content: "";
    position: absolute;
    inset: 0;
    background:
        linear-gradient(180deg, rgba(2,6,23,0.0), rgba(2,6,23,0.22) 55%, rgba(2,6,23,0.65));
    pointer-events: none;
}

.join-flash {
    max-width: 1240px;
    margin: 0 auto 1rem;
    padding: 0.6rem 0.9rem;
    border-radius: 0.75rem;
    font-size: 0.86rem;
}

.join-flash-success {
    background: #ecfdf5;
    color: #166534;
    border: 1px solid #bbf7d0;
}

.join-flash-error {
    background: #fef2f2;
    color: #b91c1c;
    border: 1px solid #fecaca;
}

.join-cta-inner {
    max-width: 1320px;
    margin: 0 auto;
    padding: 0 16px;
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.8rem;
    align-items: stretch;
    position: relative;
    z-index: 1;
}

.join-cta-card {
    background: rgba(255,255,255,0.98);
    border-radius: 1.5rem;
    padding: 1.6rem 1.6rem 1.8rem;
    border: 1px solid transparent;
    background-image:
        linear-gradient(rgba(255,255,255,0.98), rgba(255,255,255,0.98)),
        linear-gradient(135deg, rgba(249,115,22,0.35), rgba(14,116,144,0.28), rgba(20,184,166,0.28));
    background-origin: border-box;
    background-clip: padding-box, border-box;
    box-shadow: 0 20px 55px rgba(15,23,42,0.14);
    display: grid;
    grid-template-columns: 1.1fr 1.4fr;
    gap: 1.5rem;
    align-items: center;
    position: relative;
    overflow: hidden;
    transform: translateZ(0);
    transition: transform 0.18s ease, box-shadow 0.22s ease;
}

.join-cta-card::before {
    content: "";
    position: absolute;
    inset: -80px;
    background:
        radial-gradient(closest-side at 18% 22%, rgba(249,115,22,0.22), transparent 60%),
        radial-gradient(closest-side at 82% 35%, rgba(20,184,166,0.18), transparent 55%);
    opacity: 0.7;
    pointer-events: none;
}

.join-cta-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 28px 80px rgba(15,23,42,0.18);
}

.join-cta-card.reverse {
    grid-template-columns: 1.4fr 1.1fr;
}

.join-cta-image-wrap {
    border-radius: 1.2rem;
    overflow: hidden;
    background: #f3f4f6;
    border: 1px solid rgba(226,232,240,0.95);
    box-shadow: 0 14px 34px rgba(15,23,42,0.10);
    position: relative;
}

.join-cta-image-wrap::after {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(2,6,23,0.06), rgba(2,6,23,0));
    pointer-events: none;
}

.join-cta-image-wrap img {
    display: block;
    width: 100%;
    height: auto;
    object-fit: cover;
    transition: transform 0.35s ease;
}

.join-cta-card:hover .join-cta-image-wrap img {
    transform: scale(1.04);
}

.join-cta-content {
    display: flex;
    flex-direction: column;
    gap: 0.55rem;
    position: relative;
    z-index: 1;
}

.join-cta-kicker {
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.16em;
    color: #0f172a;
    font-weight: 700;
    display: inline-flex;
    align-self: flex-start;
    padding: 0.28rem 0.7rem;
    border-radius: 999px;
    background: #fff7ed;
    border: 1px solid rgba(249,115,22,0.25);
}

.join-cta-title {
    font-size: 1.55rem;
    font-weight: 800;
    color: #111827;
    letter-spacing: -0.02em;
}

.join-cta-card.reverse .join-cta-title {
    white-space: nowrap;
    font-size: 1.45rem;
}

.join-cta-text {
    font-size: 0.9rem;
    color: #4b5563;
    line-height: 1.6;
}

.join-cta-actions {
    margin-top: 0.5rem;
}

.join-cta-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.6rem 1.4rem;
    border-radius: 999px;
    border: none;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 600;
    text-decoration: none;
    gap: 0.4rem;
    transition: transform 0.12s ease, box-shadow 0.18s ease, background 0.18s ease, filter 0.18s ease;
}

.join-cta-btn.primary {
    background: linear-gradient(135deg, #f97316, #ea580c);
    color: #f9fafb;
    box-shadow: 0 14px 32px rgba(249,115,22,0.32);
}

.join-cta-btn.primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 18px 40px rgba(249,115,22,0.48);
    background: linear-gradient(135deg, #ea580c, #c2410c);
    filter: saturate(1.05);
}

.join-cta-btn.secondary {
    background: linear-gradient(135deg, #0f766e, #14b8a6);
    color: #ecfdf5;
    box-shadow: 0 14px 32px rgba(20,184,166,0.45);
}

.join-cta-btn.secondary:hover {
    transform: translateY(-1px);
    box-shadow: 0 18px 40px rgba(20,184,166,0.6);
    background: linear-gradient(135deg, #0f766e, #059669);
    filter: saturate(1.04);
}

/* Instructor modal */
.join-modal-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(15,23,42,0.55);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 60;
}

.join-modal-backdrop.open {
    display: flex;
}

.join-modal {
    width: 100%;
    max-width: 480px;
    margin: 1.5rem;
    background: #ffffff;
    border-radius: 1.2rem;
    box-shadow: 0 24px 60px rgba(15,23,42,0.4);
    padding: 1.4rem 1.5rem 1.3rem;
    border: 1px solid #e5e7eb;
}

.join-modal-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 0.7rem;
}

.join-modal-title {
    font-size: 1.05rem;
    font-weight: 600;
    color: #111827;
}

.join-modal-close {
    border: none;
    background: transparent;
    font-size: 1.1rem;
    cursor: pointer;
    color: #6b7280;
}

.join-modal-body {
    font-size: 0.88rem;
    color: #4b5563;
}

.join-field {
    margin-top: 0.7rem;
}

.join-field label {
    display: block;
    font-size: 0.78rem;
    color: #374151;
    margin-bottom: 0.25rem;
}

.join-input,
.join-textarea {
    width: 100%;
    border-radius: 0.7rem;
    border: 1px solid #e5e7eb;
    padding: 0.45rem 0.6rem;
    font-size: 0.86rem;
    outline: none;
    transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.join-input:focus,
.join-textarea:focus {
    border-color: #f97316;
    box-shadow: 0 0 0 1px rgba(249,115,22,0.45);
}

.join-error {
    margin-top: 0.25rem;
    font-size: 0.78rem;
    color: #b91c1c;
}

.join-modal-actions {
    margin-top: 1rem;
    display: flex;
    justify-content: flex-end;
    gap: 0.6rem;
}

.join-modal-btn {
    padding: 0.45rem 1.1rem;
    border-radius: 999px;
    border: none;
    font-size: 0.86rem;
    cursor: pointer;
}

.join-modal-btn.cancel {
    background: #f3f4f6;
    color: #111827;
}

.join-modal-btn.submit {
    background: #f97316;
    color: #ffffff;
}

@media (max-width: 900px) {
    .join-cta-section {
        padding: 3rem 0 3.3rem;
    }

    .join-cta-inner {
        grid-template-columns: minmax(0, 1fr);
    }

    .join-cta-card,
    .join-cta-card.reverse {
        grid-template-columns: minmax(0, 1fr);
    }

    .join-cta-card.reverse .join-cta-title {
        white-space: normal;
        font-size: 1.55rem;
    }
}