/* --- 仅用于 index.html 的 Banner 样式 (原 main.css) --- */
.main-banner {
    background-color: #2c3e50;
    color: white;
    position: relative;
    display: flex;
    align-items: center;
    padding: 6rem 0;
    min-height: 60vh;
}

.main-banner-brand-wrapper {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}
@media (min-width: 992px) {
    .main-banner-brand-wrapper {
        align-items: flex-start;
    }
}

.main-banner-logo {
    max-width: 90px;
    height: auto;
}

.main-banner-title {
    font-size: clamp(2.8rem, 7vw, 4.2rem); 
    margin-bottom: 0;
    text-shadow: 1px 1px 3px rgba(0,0,0,0.2);
    text-align: center;
}
@media (min-width: 992px) {
    .main-banner-title {
        text-align: left;
    }
}

.main-banner-description {
    font-size: 1.05rem;
    opacity: 0.8;
    line-height: 1.8;
}
@media (min-width: 992px) {
    .main-banner-description {
        border-left: 3px solid rgba(255, 255, 255, 0.25);
        padding-left: 1.5rem;
    }
}
@media (max-width: 991.98px) {
    .main-banner-description {
        border-top: 1px solid rgba(255, 255, 255, 0.25);
        padding-top: 1.5rem;
        margin-top: 1.5rem;
    }
}

.banner-buttons .btn {
    display: block;
    margin: 0.75rem auto;
    max-width: 320px;
}
@media (min-width: 992px) {
    .banner-buttons .btn {
        display: inline-block;
        margin: 0 0.5rem;
    }
}