/* ============================================================
   TRANG GIỚI THIỆU V2 — theo mockup khách duyệt 2026-08-04
   Skin trắng/đỏ #D7261E, heading gạch 2 bên. Prefix .gt-*
   ============================================================ */

.gt {
    --gt-red: #D7261E;
    --gt-red-dark: #B01116;
    --gt-grad: linear-gradient(135deg, #E8483F 0%, #B01116 100%);
    --gt-pink: #FDF0EF;
    --gt-ink: #22293a;
    --gt-body: #4A4A4A;
    --gt-line: rgba(31, 52, 81, .1);
}
.gt-container { max-width: 1240px; margin-inline: auto; padding-inline: 16px; }
.gt-sec { padding: 34px 0; }
.gt-sec--flat { background: #FBFBFD; }

/* Heading: — TITLE — */
.gt-h2 {
    display: flex; align-items: center; justify-content: center; gap: 16px;
    font-size: clamp(19px, 2vw, 24px); font-weight: 800; color: var(--gt-red-dark);
    letter-spacing: .5px; margin: 0 0 26px; text-align: center;
}
.gt-h2::before, .gt-h2::after {
    content: ""; width: 34px; height: 3px; border-radius: 2px; background: var(--gt-red);
    flex: 0 0 auto;
}

/* ── 1) VỀ THS4.0 ── */
.gt-about { padding-top: 40px; }
.gt-about__grid { display: grid; grid-template-columns: 1fr 1.05fr; gap: 46px; align-items: center; }
.gt-h1 { font-size: clamp(30px, 3.2vw, 42px); font-weight: 800; color: var(--gt-ink); margin: 0 0 18px; }
.gt-h1 .text-primary { color: var(--gt-red); }
.gt-about__content { font-size: 15px; line-height: 1.75; color: var(--gt-body); }
.gt-about__content div { margin-bottom: 4px; }
.gt-checks { list-style: none; margin: 18px 0 0; padding: 0; display: grid; gap: 12px; }
.gt-checks li { display: flex; align-items: flex-start; gap: 12px; font-size: 14.5px; color: var(--gt-ink); line-height: 1.6; }
.gt-checks__ic {
    width: 22px; height: 22px; flex: 0 0 22px; border-radius: 50%; margin-top: 1px;
    display: grid; place-items: center;
    border: 2px solid var(--gt-red); color: var(--gt-red); font-size: 10px;
}

/* Collage 2×2 + badge số */
.gt-collage { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.gt-collage__item { position: relative; margin: 0; border-radius: 16px; overflow: hidden; box-shadow: 0 12px 30px rgba(31, 52, 81, .12); }
.gt-collage__item img { width: 100%; height: 100%; min-height: 190px; object-fit: cover; display: block; }
.gt-collage__badge {
    position: absolute; display: grid; gap: 0; line-height: 1.25;
    background: #fff; border-radius: 12px; padding: 9px 14px;
    box-shadow: 0 8px 22px rgba(31, 52, 81, .18);
}
.gt-collage__badge b { font-size: 18px; color: var(--gt-red-dark); font-weight: 800; }
.gt-collage__badge small { font-size: 11.5px; color: #5a6577; }
.gt-collage__badge--top-left { top: 10px; left: 10px; }
.gt-collage__badge--top-right { top: 10px; right: 10px; }
.gt-collage__badge--bottom-left { bottom: 10px; left: 10px; }
.gt-collage__badge--bottom-right { bottom: 10px; right: 10px; }

/* ── 2) SỨ MỆNH / TẦM NHÌN ── */
.gt-mv { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }
.gt-mv__card {
    display: grid; grid-template-columns: auto 1fr; gap: 18px; align-items: start;
    border-radius: 16px; padding: 26px 28px;
}
.gt-mv__card--light { background: var(--gt-pink); }
.gt-mv__card--red { background: var(--gt-grad); box-shadow: 0 16px 36px rgba(176, 17, 22, .3); }
.gt-mv__ic {
    width: 64px; height: 64px; border-radius: 50%; flex: 0 0 64px;
    display: grid; place-items: center; background: #fff;
    color: var(--gt-red); font-size: 24px;
    box-shadow: 0 8px 20px rgba(176, 17, 22, .18);
}
.gt-mv__card h2 { font-size: 18px; font-weight: 800; letter-spacing: .5px; margin: 6px 0 8px; color: var(--gt-red-dark); }
.gt-mv__card p { font-size: 14.5px; line-height: 1.7; margin: 0; color: var(--gt-body); }
.gt-mv__card--red h2, .gt-mv__card--red p { color: #fff; }

/* ── 3) GIÁ TRỊ CỐT LÕI ── */
.gt-values { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(5, 1fr); gap: 18px; }
.gt-values li { display: grid; justify-items: center; text-align: center; gap: 8px; }
.gt-values__ic {
    width: 74px; height: 74px; border-radius: 50%;
    display: grid; place-items: center; background: var(--gt-pink);
}
.gt-values__ic img { width: 40px; height: 40px; object-fit: contain; }
.gt-values li b { font-size: 14.5px; font-weight: 800; color: var(--gt-red-dark); letter-spacing: .5px; }
.gt-values li p { font-size: 13px; line-height: 1.6; color: var(--gt-body); margin: 0; }

/* ── 4) CON SỐ NỔI BẬT ── */
.gt-numbers { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.gt-numbers li {
    display: flex; align-items: center; gap: 16px;
    background: #fff; border: 1px solid var(--gt-line); border-radius: 14px;
    padding: 18px 22px; box-shadow: 0 10px 26px rgba(31, 52, 81, .08);
}
.gt-numbers__ic { width: 52px; height: 52px; flex: 0 0 52px; display: grid; place-items: center; }
.gt-numbers__ic img { width: 44px; height: 44px; object-fit: contain; }
.gt-numbers__txt { display: grid; line-height: 1.25; }
.gt-numbers__txt b { font-size: 27px; font-weight: 800; color: var(--gt-red); }
.gt-numbers__txt small { font-size: 13px; color: var(--gt-body); }

/* ── 5) PHƯƠNG PHÁP ── */
.gt-method { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.gt-method li {
    display: grid; grid-template-columns: auto 1fr; gap: 14px; align-items: start;
    background: #fff; border: 1px solid var(--gt-line); border-radius: 14px;
    padding: 18px 18px 16px; box-shadow: 0 10px 26px rgba(31, 52, 81, .07);
}
.gt-method__ic { width: 46px; height: 46px; flex: 0 0 46px; display: grid; place-items: center; }
.gt-method__ic img { width: 42px; height: 42px; object-fit: contain; }
.gt-method__txt b { display: block; font-size: 13.5px; font-weight: 800; color: var(--gt-ink); letter-spacing: .3px; margin-bottom: 5px; }
.gt-method__txt p { font-size: 13px; line-height: 1.6; color: var(--gt-body); margin: 0; }

/* ── 6) LÝ DO LỰA CHỌN ── */
.gt-why { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.gt-why li {
    display: grid; grid-template-columns: auto 1fr; gap: 14px; align-items: start;
    background: #fff; border: 1px solid var(--gt-line); border-radius: 14px;
    padding: 18px 20px;
}
.gt-why__ic { width: 44px; height: 44px; flex: 0 0 44px; display: grid; place-items: center; }
.gt-why__ic img, .gt-why__ic svg { width: 40px; height: 40px; object-fit: contain; }
.gt-why__txt b { display: block; font-size: 13.5px; font-weight: 800; color: var(--gt-red-dark); letter-spacing: .3px; margin-bottom: 5px; }
.gt-why__txt p { font-size: 13px; line-height: 1.6; color: var(--gt-body); margin: 0; }

/* ── 7+8) ĐỘI NGŨ ── */
.gt-team { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.gt-person {
    display: grid; grid-template-columns: 1fr 1fr; align-items: center;
    background: #fff; border: 1px solid var(--gt-line); border-radius: 14px;
    overflow: hidden; text-decoration: none;
    transition: transform .22s ease, box-shadow .22s ease, border-color .22s ease;
}
.gt-person:hover { transform: translateY(-4px); box-shadow: 0 16px 34px rgba(176, 17, 22, .13); border-color: var(--gt-red); }
.gt-person__photo { height: 168px; background: #f4f5f8; }
.gt-person__photo img { width: 100%; height: 100%; object-fit: cover; object-position: center top; display: block; }
.gt-person__fallback { display: grid; place-items: center; width: 100%; height: 100%; background: var(--gt-grad); color: #fff; font-size: 30px; font-weight: 800; }
.gt-person__meta { display: grid; gap: 3px; padding: 12px 14px; text-align: center; justify-items: center; }
.gt-person__meta small { font-size: 12.5px; color: #7c8598; }
.gt-person__meta b { font-size: 14.5px; color: var(--gt-ink); line-height: 1.35; }
.gt-person__meta em { font-style: normal; font-size: 12.5px; color: var(--gt-body); }

/* ── RESPONSIVE ── */
@media (max-width: 1023px) {
    .gt-about__grid { grid-template-columns: 1fr; gap: 30px; }
    .gt-mv { grid-template-columns: 1fr; }
    .gt-values { grid-template-columns: repeat(3, 1fr); gap: 20px 14px; }
    .gt-numbers, .gt-method { grid-template-columns: repeat(2, 1fr); }
    .gt-why { grid-template-columns: repeat(2, 1fr); }
    .gt-team { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 639px) {
    .gt-sec { padding: 26px 0; }
    .gt-values { grid-template-columns: repeat(2, 1fr); }
    .gt-method, .gt-why { grid-template-columns: 1fr; }
    /* 6/08 mobile: con số nổi bật 2 hàng × 2 cột, hết khoảng trắng (doc mục II) */
    .gt-numbers { grid-template-columns: repeat(2, 1fr); gap: 10px; }
    .gt-numbers li { flex-direction: column; text-align: center; gap: 8px; padding: 14px 10px 12px; }
    .gt-numbers__txt { justify-items: center; }
    .gt-numbers__txt b { font-size: 22px; }
    .gt-numbers__txt small { font-size: 12.5px; }
    .gt-team { grid-template-columns: repeat(2, 1fr); gap: 10px; }
    .gt-collage { gap: 10px; }
    /* 6/08 mobile: badge số dời hết xuống đáy ảnh — không che mặt giáo viên (doc mục II) */
    .gt-collage__badge { padding: 5px 9px; border-radius: 9px; }
    .gt-collage__badge b { font-size: 13px; }
    .gt-collage__badge small { font-size: 10px; }
    .gt-collage__badge--top-left { top: auto; bottom: 8px; left: 8px; }
    .gt-collage__badge--top-right { top: auto; bottom: 8px; right: 8px; }
    .gt-collage__badge--bottom-left { bottom: 8px; left: 8px; }
    .gt-collage__badge--bottom-right { bottom: 8px; right: 8px; }
}

/* Focus + motion */
.gt a:focus-visible { outline: 3px solid var(--gt-red); outline-offset: 3px; border-radius: 8px; }
@media (prefers-reduced-motion: reduce) {
    .gt *, .gt *::before, .gt *::after { transition-duration: .01ms !important; animation: none !important; }
}

/* ═══ HIỆU ỨNG (2026-08-04) ═══ */
/* Reveal khi cuộn — chỉ kích hoạt khi JS gắn html.gt-anim (không JS = hiện bình thường) */
html.gt-anim .gt [data-rv],
html.gt-anim .gt [data-rv-group] > * {
    opacity: 0; transform: translateY(26px);
    transition: opacity .55s ease, transform .55s cubic-bezier(.22, .8, .3, 1);
}
html.gt-anim .gt [data-rv="left"]  { transform: translateX(-34px); }
html.gt-anim .gt [data-rv="right"] { transform: translateX(34px); }
html.gt-anim .gt [data-rv].is-in,
html.gt-anim .gt [data-rv-group] > .is-in { opacity: 1; transform: none; }

/* Badge số trên collage: nổi bồng bềnh nhẹ */
.gt-collage__badge { animation: gt-float 3.6s ease-in-out infinite; }
.gt-collage__item:nth-child(2) .gt-collage__badge { animation-delay: .9s; }
.gt-collage__item:nth-child(3) .gt-collage__badge { animation-delay: 1.8s; }
.gt-collage__item:nth-child(4) .gt-collage__badge { animation-delay: 2.7s; }
@keyframes gt-float { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-6px); } }

/* Ảnh collage zoom nhẹ khi hover */
.gt-collage__item img { transition: transform .35s ease; }
.gt-collage__item:hover img { transform: scale(1.05); }

/* Icon sứ mệnh/tầm nhìn đập nhịp nhẹ */
.gt-mv__ic i { animation: gt-pulse 2.6s ease-in-out infinite; }
@keyframes gt-pulse { 0%, 100% { transform: scale(1); } 50% { transform: scale(1.12); } }

/* Giá trị cốt lõi: icon nảy khi hover */
.gt-values__ic { transition: transform .25s ease, background .25s ease; }
.gt-values li:hover .gt-values__ic { transform: translateY(-6px) scale(1.06); background: #FADFDC; }

/* Card số liệu / phương pháp / lý do: nâng khi hover + icon lắc */
.gt-numbers li, .gt-method li, .gt-why li { transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease; }
.gt-numbers li:hover, .gt-method li:hover, .gt-why li:hover {
    transform: translateY(-5px);
    box-shadow: 0 18px 38px rgba(176, 17, 22, .13);
    border-color: rgba(215, 38, 30, .4);
}
.gt-numbers__ic img, .gt-method__ic img, .gt-why__ic img { transition: transform .3s ease; }
.gt-numbers li:hover img, .gt-method li:hover img, .gt-why li:hover img { transform: scale(1.15) rotate(-5deg); }

/* Gạch đỏ heading loang ra khi vào tầm nhìn */
html.gt-anim .gt-h2::before, html.gt-anim .gt-h2::after { width: 0; transition: width .6s ease .2s; }
html.gt-anim .gt-h2.is-in::before, html.gt-anim .gt-h2.is-in::after { width: 34px; }

@media (prefers-reduced-motion: reduce) {
    html.gt-anim .gt [data-rv], html.gt-anim .gt [data-rv-group] > * { opacity: 1 !important; transform: none !important; }
    .gt-collage__badge, .gt-mv__ic i { animation: none !important; }
}