/* Trang Giới thiệu MAE-INFO */
.gioi-thieu {
    max-width: 920px;
    margin: 0 auto 1.5rem;
    padding: 0 0 1rem;
}
.gioi-thieu__hero {
    position: relative;
    padding: 1.25rem 1.2rem 1.35rem;
    border-radius: 16px;
    background:
        radial-gradient(120% 80% at 100% 0%, rgba(40, 140, 70, 0.18), transparent 55%),
        linear-gradient(145deg, #0f3d22 0%, #145c30 48%, #1a7a3c 100%);
    color: #f4faf6;
    margin-bottom: 1rem;
    overflow: hidden;
}
.gioi-thieu__hero-brand {
    display: flex;
    align-items: center;
    gap: 0.9rem;
    margin-bottom: 0.9rem;
}
.gioi-thieu__logo {
    width: 72px;
    height: 72px;
    border-radius: 16px;
    background: #fff;
    padding: 6px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
}
.gioi-thieu__eyebrow {
    font-size: 0.75rem;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    opacity: 0.85;
}
.gioi-thieu__title {
    margin: 0.1rem 0;
    font-size: clamp(1.55rem, 4vw, 2rem);
    font-weight: 800;
    letter-spacing: 0.02em;
    line-height: 1.15;
}
.gioi-thieu__subtitle {
    font-size: 0.92rem;
    opacity: 0.92;
}
.gioi-thieu__lead {
    margin: 0 0 1rem;
    font-size: 0.95rem;
    line-height: 1.55;
    color: rgba(255, 255, 255, 0.92);
}
.gioi-thieu__lead strong {
    color: #fff;
}
.gioi-thieu__hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}
.gioi-thieu__hero-actions .btn-outline-success {
    color: #e8f8ee;
    border-color: rgba(255, 255, 255, 0.45);
}
.gioi-thieu__hero-actions .btn-outline-success:hover {
    background: rgba(255, 255, 255, 0.12);
    color: #fff;
    border-color: #fff;
}
.gioi-thieu__hero-actions .btn-success {
    background: #fff;
    border-color: #fff;
    color: #0f3d22;
    font-weight: 600;
}
.gioi-thieu__hero-actions .btn-success:hover {
    background: #e8f5e9;
    border-color: #e8f5e9;
    color: #0a2e18;
}

.gioi-thieu__card {
    background: #fff;
    border: 1px solid rgba(13, 74, 26, 0.1);
    border-radius: 14px;
    padding: 1rem 1.1rem 1.15rem;
    margin-bottom: 0.85rem;
    box-shadow: 0 1px 0 rgba(13, 74, 26, 0.04);
}
.gioi-thieu__card-head {
    margin-bottom: 0.75rem;
}
.gioi-thieu__h2 {
    margin: 0 0 0.35rem;
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--primary-dark, #0D4A1A);
}
.gioi-thieu__muted {
    font-size: 0.88rem;
    color: #5a6b5e;
    line-height: 1.5;
}
.gioi-thieu__goals {
    margin: 0;
    padding-left: 1.1rem;
    color: #2c3a30;
    font-size: 0.9rem;
    line-height: 1.55;
}
.gioi-thieu__goals li + li {
    margin-top: 0.35rem;
}

.gioi-thieu__video-frame {
    border-radius: 12px;
    overflow: hidden;
    background: #0b1820;
    border: 1px solid rgba(0, 0, 0, 0.08);
    aspect-ratio: 16 / 9;
}
.gioi-thieu__video {
    display: block;
    width: 100%;
    height: 100%;
    background: #0b1820;
}

.gioi-thieu__groups {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.45rem;
    margin-top: 0.75rem;
}
@media (min-width: 768px) {
    .gioi-thieu__groups {
        grid-template-columns: repeat(4, minmax(0, 1fr));
    }
}
.gioi-thieu__group {
    display: flex;
    align-items: flex-start;
    gap: 0.45rem;
    padding: 0.55rem 0.6rem;
    border-radius: 10px;
    background: #f3faf4;
    border: 1px solid rgba(13, 74, 26, 0.08);
    font-size: 0.8rem;
    line-height: 1.3;
    color: #1d3324;
    text-decoration: none;
    transition: background 0.15s ease, border-color 0.15s ease, box-shadow 0.15s ease;
}
a.gioi-thieu__group:hover,
a.gioi-thieu__group:focus {
    background: #e5f4ea;
    border-color: rgba(27, 122, 61, 0.35);
    color: var(--primary-dark, #0D4A1A);
    box-shadow: 0 1px 0 rgba(13, 74, 26, 0.06);
    outline: none;
}
.gioi-thieu__group span {
    flex: 0 0 auto;
    font-weight: 700;
    font-variant-numeric: tabular-nums;
    color: var(--primary, #1B7A3D);
    font-size: 0.72rem;
}

.gioi-thieu__docs {
    display: flex;
    flex-direction: column;
    gap: 0.55rem;
}
.gioi-thieu__doc {
    border: 1px solid rgba(13, 74, 26, 0.12);
    border-radius: 12px;
    background: #fbfefc;
    overflow: hidden;
}
.gioi-thieu__doc > summary {
    list-style: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.55rem;
    padding: 0.75rem 0.85rem;
    font-weight: 600;
    color: var(--primary-dark, #0D4A1A);
    user-select: none;
}
.gioi-thieu__doc > summary::-webkit-details-marker { display: none; }
.gioi-thieu__doc > summary::after {
    content: "";
    margin-left: auto;
    width: 0.45rem;
    height: 0.45rem;
    border-right: 2px solid currentColor;
    border-bottom: 2px solid currentColor;
    transform: rotate(45deg);
    opacity: 0.55;
    transition: transform 0.15s ease;
}
.gioi-thieu__doc[open] > summary::after {
    transform: rotate(-135deg);
}
.gioi-thieu__doc-badge {
    flex: 0 0 auto;
    font-size: 0.68rem;
    font-weight: 700;
    letter-spacing: 0.03em;
    padding: 0.2rem 0.4rem;
    border-radius: 6px;
    background: #145c30;
    color: #fff;
}
.gioi-thieu__doc-title {
    flex: 1 1 auto;
    font-size: 0.92rem;
}
.gioi-thieu__doc-dl {
    color: var(--primary, #1B7A3D);
    padding: 0.2rem 0.35rem;
    border-radius: 6px;
}
.gioi-thieu__doc-dl:hover {
    background: rgba(27, 122, 61, 0.1);
}
.gioi-thieu__doc-embed {
    border-top: 1px solid rgba(13, 74, 26, 0.08);
    background: #e8eee9;
    height: min(70vh, 560px);
}
.gioi-thieu__doc-embed iframe {
    width: 100%;
    height: 100%;
    border: 0;
    background: #fff;
}
.gioi-thieu__doc--link {
    background: #fff;
}
.gioi-thieu__doc-link {
    display: flex;
    align-items: center;
    gap: 0.55rem;
    padding: 0.85rem 0.9rem;
    text-decoration: none;
    color: inherit;
}
.gioi-thieu__doc-link:hover {
    background: #f3faf4;
}
.gioi-thieu__doc-hint {
    margin-left: auto;
    font-size: 0.78rem;
    color: #6b7a6e;
    font-weight: 500;
}
.gioi-thieu__doc-arrow {
    color: var(--primary, #1B7A3D);
}