/* ==========================================================================
   بنر خوش‌آمدگویی معلم تازه‌وارد
   ========================================================================== */

.teacher-welcome-banner {
    position: relative;
    width: 100%;
    aspect-ratio: 5 / 2; /* نسبت 1500x600 */
    background-image: url('../images/teacher-welcome-desktop.webp');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    border-radius: 24px;
    overflow: hidden;
    margin: 0 0 30px;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.15);
    display: flex;
    align-items: flex-end;
    justify-content: center;
    padding: 30px;
    animation: teacherWelcomeIn 0.6s ease-out;
}

@keyframes teacherWelcomeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ===== دکمه «بزن بریم» ===== */
.teacher-welcome-cta {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background: linear-gradient(135deg, #8b5cf6, #ec4899);
    color: #fff;
    padding: 16px 40px;
    border-radius: 999px;
    font-family: inherit;
    font-weight: 800;
    font-size: 1.2rem;
    text-decoration: none;
    box-shadow: 0 10px 30px rgba(139, 92, 246, 0.5);
    transition: transform 0.25s ease, box-shadow 0.25s ease;
    cursor: pointer;
}

.teacher-welcome-cta:hover {
    transform: translateY(-3px) scale(1.03);
    box-shadow: 0 15px 40px rgba(139, 92, 246, 0.6);
}

.teacher-welcome-arrow {
    font-size: 1.4rem;
    transition: transform 0.25s ease;
}

.teacher-welcome-cta:hover .teacher-welcome-arrow {
    transform: translateX(-6px);
}

/* ===== ریسپانسیو موبایل ===== */
@media (max-width: 640px) {
    .teacher-welcome-banner {
        aspect-ratio: 3 / 2; /* نسبت 900x600 */
        background-image: url('../images/teacher-welcome-mobile.webp');
        border-radius: 18px;
        padding: 20px;
    }

    .teacher-welcome-cta {
        padding: 14px 30px;
        font-size: 1.05rem;
    }
}

/* ===== دسترس‌پذیری ===== */
@media (prefers-reduced-motion: reduce) {
    .teacher-welcome-banner,
    .teacher-welcome-banner * {
        animation: none !important;
    }
}