/* ============================================================
   TRANG GIỚI THIỆU (/page/gioi-thieu) — về THS4.0
   Tái dùng design token .hl (home-landing.css nạp trước file này)
   Prefix riêng: .ab-*
   ============================================================ */

/* ── 1) HERO ─────────────────────────────────────────────── */
.ab-hero {
    position: relative;
    padding: 34px 0 64px;
    color: #fff;
    background:
        radial-gradient(900px 420px at 85% -10%, rgba(215, 38, 30, .35) 0, transparent 60%),
        radial-gradient(700px 380px at -10% 110%, rgba(255, 211, 77, .14) 0, transparent 55%),
        linear-gradient(135deg, #16263d 0%, var(--c-navy) 45%, #2a466e 100%);
    overflow: hidden;
}
.ab-hero::after {
    content: "";
    position: absolute; inset: 0;
    background: repeating-linear-gradient(135deg, rgba(255, 255, 255, .03) 0 1px, transparent 1px 26px);
    pointer-events: none;
}
.ab-hero > .hl-container { position: relative; z-index: 1; }

.ab-crumb { display: flex; align-items: center; gap: 8px; font-size: 14px; margin-bottom: 26px; color: rgba(255, 255, 255, .75); }
.ab-crumb a { color: rgba(255, 255, 255, .9); text-decoration: none; display: inline-flex; align-items: center; gap: 6px; transition: color .2s; }
.ab-crumb a:hover { color: var(--c-gold); }
.ab-crumb [aria-current] { color: var(--c-gold); font-weight: 600; }

.ab-hero__grid { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr); gap: 48px; align-items: center; }

.ab-eyebrow {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 7px 16px; border-radius: 999px;
    background: rgba(255, 255, 255, .1); border: 1px solid rgba(255, 255, 255, .22);
    color: var(--c-gold); font-weight: 700; font-size: 13.5px; letter-spacing: .4px; text-transform: uppercase;
    margin-bottom: 18px;
}
.ab-h1 { font-size: clamp(28px, 3.4vw, 44px); line-height: 1.22; font-weight: 800; color: #fff; margin: 0 0 16px; }
.ab-h1__brand { color: var(--c-gold); }
.ab-h1__hl {
    background: linear-gradient(120deg, #ff7d75, #ffd34d);
    -webkit-background-clip: text; background-clip: text; color: transparent;
}
.ab-hero__lead { font-size: 17px; line-height: 1.7; color: rgba(255, 255, 255, .88); max-width: 560px; margin: 0 0 24px; }

.ab-hero__cta { display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: 24px; }

.ab-hero__chips { list-style: none; display: flex; flex-wrap: wrap; gap: 10px 22px; padding: 0; margin: 0; }
.ab-hero__chips li { display: inline-flex; align-items: center; gap: 8px; font-size: 14.5px; color: rgba(255, 255, 255, .85); }
.ab-hero__chips li i { color: var(--c-gold); font-size: 13px; }

/* Collage 4 ảnh thật + badge */
.ab-collage { position: relative; display: grid; grid-template-columns: 1fr 1fr; grid-auto-rows: 185px; gap: 14px; }
.ab-collage__item { position: relative; margin: 0; border-radius: 16px; overflow: hidden; border: 1px solid rgba(255, 255, 255, .18); box-shadow: 0 18px 40px rgba(0, 0, 0, .35); background: #fff; }
.ab-collage__item img { width: 100%; height: 100%; object-fit: cover; object-position: center top; display: block; }
.ab-collage__name {
    position: absolute; left: 0; right: 0; bottom: 0;
    display: grid; gap: 0; padding: 18px 12px 8px; text-align: center;
    background: linear-gradient(180deg, transparent, rgba(13, 24, 40, .82) 55%);
    color: #fff; line-height: 1.3;
}
.ab-collage__name b { font-size: 12.5px; font-weight: 700; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.ab-collage__name small { font-size: 10.5px; color: var(--c-gold); }
.ab-collage__item--1 { transform: translateY(18px); }
.ab-collage__item--4 { transform: translateY(-18px); }
.ab-collage__badge {
    position: absolute; left: 50%; top: 50%; transform: translate(-50%, -50%);
    display: grid; justify-items: center; gap: 2px; text-align: center;
    padding: 14px 22px; border-radius: 16px;
    background: var(--c-grad); color: #fff;
    box-shadow: 0 14px 34px rgba(182, 12, 19, .5), 0 0 0 5px rgba(255, 255, 255, .14);
}
.ab-collage__badge i { font-size: 20px; margin-bottom: 4px; color: var(--c-gold); }
.ab-collage__badge b { font-size: 17px; letter-spacing: .5px; }
.ab-collage__badge small { font-size: 11.5px; opacity: .9; letter-spacing: .3px; }

/* ── 2) STATS STRIP ──────────────────────────────────────── */
.ab-stats { background: var(--c-grad); padding: 30px 0; position: relative; overflow: hidden; }
.ab-stats::before {
    content: ""; position: absolute; inset: 0;
    background: radial-gradient(600px 200px at 20% 0%, rgba(255, 255, 255, .12) 0, transparent 60%);
}
.ab-stats__row { list-style: none; display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; margin: 0; padding: 0; position: relative; }
.ab-stat { display: grid; justify-items: center; text-align: center; gap: 4px; color: #fff; padding: 6px 10px; }
.ab-stat + .ab-stat { border-left: 1px solid rgba(255, 255, 255, .22); }
.ab-stat__ic { width: 46px; height: 46px; border-radius: 12px; display: grid; place-items: center; background: rgba(255, 255, 255, .14); margin-bottom: 4px; }
.ab-stat__ic i { font-size: 19px; color: #fff !important; }
.ab-stat__num { font-size: clamp(24px, 2.6vw, 34px); font-weight: 800; line-height: 1; }
.ab-stat__label { font-size: 13.5px; opacity: .92; }

/* ── 3) STORY TIMELINE ───────────────────────────────────── */
.ab-story__list { list-style: none; margin: 0; padding: 0; position: relative; max-width: 860px; margin-inline: auto; }
.ab-story__list::before {
    content: ""; position: absolute; left: 27px; top: 10px; bottom: 10px; width: 3px;
    background: linear-gradient(180deg, var(--c-red), var(--c-navy) 60%, var(--c-gold));
    border-radius: 3px; opacity: .35;
}
.ab-story__item { position: relative; padding: 0 0 30px 84px; }
.ab-story__item:last-child { padding-bottom: 0; }
.ab-story__dot {
    position: absolute; left: 0; top: 0;
    width: 56px; height: 56px; border-radius: 50%;
    display: grid; place-items: center;
    background: #fff; border: 2px solid var(--c-red);
    color: var(--c-red); font-size: 20px;
    box-shadow: 0 8px 20px rgba(215, 38, 30, .18);
}
.ab-story__item:nth-child(2) .ab-story__dot { border-color: var(--c-navy); color: var(--c-navy); box-shadow: 0 8px 20px var(--c-navy-12); }
.ab-story__item:nth-child(3) .ab-story__dot { border-color: #d9a406; color: #b8880a; box-shadow: 0 8px 20px rgba(217, 164, 6, .2); }
.ab-story__card {
    background: #fff; border: 1px solid var(--c-navy-12); border-radius: 16px;
    padding: 20px 24px; box-shadow: 0 10px 26px rgba(31, 52, 81, .07);
    transition: transform .25s ease, box-shadow .25s ease;
}
.ab-story__item:hover .ab-story__card { transform: translateY(-3px); box-shadow: 0 16px 34px rgba(31, 52, 81, .12); }
.ab-story__label {
    display: inline-block; padding: 3px 12px; border-radius: 999px;
    background: var(--c-red-08); color: var(--c-red-dark);
    font-size: 12.5px; font-weight: 700; letter-spacing: .4px; text-transform: uppercase; margin-bottom: 8px;
}
.ab-story__card h3 { font-size: 18.5px; font-weight: 700; color: var(--c-navy); margin: 0 0 6px; }
.ab-story__card p { font-size: 15px; line-height: 1.65; color: #47536b; margin: 0; }

/* ── 4) MISSION / VISION + VALUES ────────────────────────── */
.ab-mv { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; margin-bottom: 38px; }
.ab-mv__card {
    position: relative; border-radius: 18px; padding: 28px 26px 24px;
    background: #fff; border: 1px solid var(--c-navy-12);
    box-shadow: 0 12px 30px rgba(31, 52, 81, .07);
    overflow: hidden; transition: transform .25s ease, box-shadow .25s ease;
}
.ab-mv__card:hover { transform: translateY(-4px); box-shadow: 0 20px 40px rgba(31, 52, 81, .13); }
.ab-mv__card::before { content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 5px; }
.ab-mv__card--red::before { background: var(--c-grad); }
.ab-mv__card--navy::before { background: linear-gradient(180deg, var(--c-navy), #2a466e); }
.ab-mv__ic { display: inline-grid; place-items: center; width: 62px; height: 62px; border-radius: 16px; background: var(--c-red-08); margin-bottom: 14px; }
.ab-mv__card--navy .ab-mv__ic { background: var(--c-navy-06); }
.ab-mv__ic img { width: 40px; height: 40px; object-fit: contain; }
.ab-mv__card h3 { font-size: 20px; font-weight: 800; color: var(--c-navy); margin: 0 0 8px; }
.ab-mv__card p { font-size: 15.5px; line-height: 1.7; color: #47536b; margin: 0; }

.ab-values__title { text-align: center; font-size: 20px; font-weight: 800; color: var(--c-navy); margin: 0 0 20px; }
.ab-values { list-style: none; display: grid; grid-template-columns: repeat(5, 1fr); gap: 16px; margin: 0; padding: 0; }
.ab-value {
    background: #fff; border: 1px solid var(--c-navy-12); border-radius: 14px;
    padding: 20px 14px; text-align: center; display: grid; justify-items: center; gap: 8px;
    transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease;
}
.ab-value:hover { transform: translateY(-4px); border-color: var(--c-red); box-shadow: 0 14px 28px rgba(215, 38, 30, .12); }
.ab-value__ic { width: 52px; height: 52px; border-radius: 50%; display: grid; place-items: center; background: var(--c-red-08); }
.ab-value__ic img { width: 30px; height: 30px; object-fit: contain; }
.ab-value b { font-size: 14.5px; font-weight: 800; color: var(--c-red-dark); letter-spacing: .5px; }
.ab-value p { font-size: 13px; line-height: 1.55; color: #5a6577; margin: 0; }

/* ── 5) METHOD 4 BƯỚC ────────────────────────────────────── */
.ab-method { background: linear-gradient(180deg, #f7f9fc, #fff); }
.ab-method__grid { list-style: none; display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; margin: 0; padding: 0; counter-reset: ab-step; }
.ab-method__step {
    position: relative; background: #fff; border: 1px solid var(--c-navy-12); border-radius: 16px;
    padding: 26px 20px 22px; text-align: center; display: grid; justify-items: center; gap: 10px;
    transition: transform .25s ease, box-shadow .25s ease;
}
.ab-method__step:hover { transform: translateY(-5px); box-shadow: 0 18px 36px rgba(31, 52, 81, .12); }
.ab-method__num {
    position: absolute; top: -14px; left: 50%; transform: translateX(-50%);
    width: 34px; height: 34px; border-radius: 50%;
    display: grid; place-items: center;
    background: var(--c-grad); color: #fff; font-weight: 800; font-size: 15px;
    box-shadow: 0 6px 14px rgba(182, 12, 19, .35);
}
.ab-method__ic { width: 64px; height: 64px; border-radius: 16px; display: grid; place-items: center; background: var(--c-navy-06); margin-top: 8px; }
.ab-method__ic img { width: 42px; height: 42px; object-fit: contain; }
.ab-method__step h3 { font-size: 16.5px; font-weight: 800; color: var(--c-navy); margin: 0; }
.ab-method__step p { font-size: 14px; line-height: 1.6; color: #5a6577; margin: 0; }
.ab-method__arrow {
    position: absolute; right: -16px; top: 50%; transform: translateY(-50%);
    width: 28px; height: 28px; border-radius: 50%; display: grid; place-items: center;
    background: #fff; border: 1px solid var(--c-red-14); color: var(--c-red); font-size: 11px;
    z-index: 1; box-shadow: 0 4px 10px rgba(215, 38, 30, .15);
}

/* ── 6) COMPARE TABLE ────────────────────────────────────── */
.ab-cmp-wrap { overflow-x: auto; border-radius: 16px; border: 1px solid var(--c-navy-12); box-shadow: 0 14px 34px rgba(31, 52, 81, .08); }
.ab-cmp { width: 100%; border-collapse: collapse; min-width: 640px; background: #fff; }
.ab-cmp thead th { padding: 16px 18px; font-size: 15.5px; text-align: left; }
.ab-cmp thead .ab-cmp__crit { background: var(--c-navy); color: #fff; width: 22%; }
.ab-cmp thead .ab-cmp__left { background: #eef1f6; color: #5a6577; width: 39%; }
.ab-cmp thead .ab-cmp__right { background: var(--c-grad); color: #fff; width: 39%; }
.ab-cmp thead th i { margin-right: 8px; }
.ab-cmp tbody th, .ab-cmp tbody td { padding: 14px 18px; font-size: 14.5px; line-height: 1.55; border-top: 1px solid var(--c-navy-06); vertical-align: top; }
.ab-cmp tbody th { color: var(--c-navy); font-weight: 700; text-align: left; background: #fafbfd; }
.ab-cmp tbody td:nth-child(2) { color: #6a7386; }
.ab-cmp tbody td:nth-child(2) i { color: #c0392b; opacity: .55; margin-right: 8px; }
.ab-cmp tbody td:nth-child(3) { color: #2c3a52; background: rgba(215, 38, 30, .03); font-weight: 500; }
.ab-cmp tbody td:nth-child(3) i { color: #1e9e50; margin-right: 8px; }

/* ── 7) ECOSYSTEM GRID ───────────────────────────────────── */
.ab-eco { background: linear-gradient(180deg, #fff, #f7f9fc); }
.ab-eco__grid { list-style: none; display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin: 0; padding: 0; }
.ab-eco__card {
    display: grid; gap: 8px; height: 100%;
    background: #fff; border: 1px solid var(--c-navy-12); border-radius: 16px;
    padding: 24px 22px; text-decoration: none;
    transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease;
}
.ab-eco__card:hover { transform: translateY(-5px); box-shadow: 0 18px 38px rgba(31, 52, 81, .13); }
.ab-eco__ic { width: 52px; height: 52px; border-radius: 14px; display: grid; place-items: center; margin-bottom: 4px; }
.ab-eco__ic i { font-size: 21px; color: #fff !important; }
.ab-eco__card--red .ab-eco__ic { background: var(--c-grad); }
.ab-eco__card--navy .ab-eco__ic { background: linear-gradient(135deg, var(--c-navy), #2a466e); }
.ab-eco__card--gold .ab-eco__ic { background: linear-gradient(135deg, #e2a411, #c98d05); }
.ab-eco__card--green .ab-eco__ic { background: linear-gradient(135deg, #1e9e50, #157a3c); }
.ab-eco__card--red:hover { border-color: var(--c-red); }
.ab-eco__card--navy:hover { border-color: var(--c-navy); }
.ab-eco__card--gold:hover { border-color: #d9a406; }
.ab-eco__card--green:hover { border-color: #1e9e50; }
.ab-eco__card b { font-size: 16.5px; font-weight: 800; color: var(--c-navy); }
.ab-eco__card p { font-size: 14px; line-height: 1.6; color: #5a6577; margin: 0; }
.ab-eco__go { display: inline-flex; align-items: center; gap: 7px; font-size: 13.5px; font-weight: 700; color: var(--c-red-dark); margin-top: 2px; }
.ab-eco__go i { transition: transform .2s ease; font-size: 11px; }
.ab-eco__card:hover .ab-eco__go i { transform: translateX(4px); }

/* ── 8) WHY GRID (6 thẻ SVG nhiều màu) ───────────────────── */
.ab-why__grid { list-style: none; display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin: 0; padding: 0; }
.ab-why__card {
    background: #fff; border: 1px solid var(--c-navy-12); border-radius: 16px;
    padding: 24px 22px; display: grid; justify-items: center; gap: 10px; text-align: center;
    transition: transform .25s ease, box-shadow .25s ease;
}
.ab-why__card:hover { transform: translateY(-5px); box-shadow: 0 18px 36px rgba(31, 52, 81, .12); }
.ab-why__ic { width: 64px; height: 64px; display: grid; place-items: center; }
.ab-why__ic svg, .ab-why__ic img { width: 60px; height: 60px; transition: transform .3s ease; }
.ab-why__card:hover .ab-why__ic svg, .ab-why__card:hover .ab-why__ic img { transform: scale(1.12) rotate(-3deg); }
.ab-why__card b { font-size: 16.5px; font-weight: 800; color: var(--c-navy); }
.ab-why__card p { font-size: 14px; line-height: 1.6; color: #5a6577; margin: 0; }

/* ── 10) PROOF PLACEHOLDER ───────────────────────────────── */
.ab-proof .ab-proof__card {
    position: relative; display: grid; grid-template-columns: auto 1fr; gap: 24px; align-items: center;
    background: linear-gradient(135deg, #16263d, var(--c-navy) 60%, #2a466e);
    border-radius: 20px; padding: 34px 38px; color: #fff; overflow: hidden;
}
.ab-proof__card::after {
    content: ""; position: absolute; inset: 0;
    background: linear-gradient(110deg, transparent 30%, rgba(255, 255, 255, .07) 45%, transparent 60%);
    background-size: 220% 100%;
    animation: ab-shimmer 3.2s linear infinite;
    pointer-events: none;
}
@keyframes ab-shimmer { from { background-position: 180% 0; } to { background-position: -80% 0; } }
.ab-proof__ribbon {
    position: absolute; top: 16px; right: -34px; transform: rotate(38deg);
    background: var(--c-gold); color: #6b4d00; font-size: 12px; font-weight: 800;
    letter-spacing: .6px; text-transform: uppercase; padding: 5px 42px; z-index: 1;
}
.ab-proof__ic { width: 72px; height: 72px; border-radius: 18px; display: grid; place-items: center; background: rgba(255, 211, 77, .16); }
.ab-proof__ic i { font-size: 30px; color: var(--c-gold) !important; }
.ab-proof__body .hl-h2 { color: #fff; margin-bottom: 8px; }
.ab-proof__body p { font-size: 15px; line-height: 1.7; color: rgba(255, 255, 255, .85); margin: 0 0 16px; max-width: 640px; }

/* ── 11) LEGAL ───────────────────────────────────────────── */
.ab-legal__grid { display: grid; grid-template-columns: 1.15fr .85fr; gap: 22px; }
.ab-legal__card {
    background: #fff; border: 1px solid var(--c-navy-12); border-radius: 18px;
    padding: 26px 26px 24px; box-shadow: 0 12px 30px rgba(31, 52, 81, .06);
}
.ab-legal__card h3 { display: flex; align-items: center; gap: 10px; font-size: 18px; font-weight: 800; color: var(--c-navy); margin: 0 0 16px; }
.ab-legal__card h3 i { color: var(--c-red); }
.ab-legal__info { list-style: none; margin: 0; padding: 0; display: grid; gap: 12px; }
.ab-legal__info li { display: flex; gap: 12px; align-items: flex-start; font-size: 14.5px; line-height: 1.6; color: #47536b; }
.ab-legal__info li i { width: 30px; height: 30px; flex: 0 0 30px; border-radius: 8px; display: grid; place-items: center; background: var(--c-red-08); color: var(--c-red-dark); font-size: 13px; margin-top: 1px; }
.ab-legal__info a { color: var(--c-red-dark); font-weight: 600; text-decoration: none; }
.ab-legal__info a:hover { text-decoration: underline; }
.ab-legal__sub { font-size: 15.5px; font-weight: 800; color: var(--c-navy); margin: 20px 0 10px; }
.ab-legal__policies { list-style: none; margin: 0; padding: 0; display: grid; gap: 6px; }
.ab-legal__policies a {
    display: flex; align-items: center; gap: 10px;
    padding: 11px 14px; border-radius: 10px; font-size: 14.5px;
    color: #47536b; text-decoration: none; border: 1px solid transparent;
    transition: background .2s, color .2s, border-color .2s, transform .2s;
}
.ab-legal__policies a i { color: var(--c-red); font-size: 11px; transition: transform .2s; }
.ab-legal__policies a:hover { background: var(--c-red-08); color: var(--c-red-dark); border-color: var(--c-red-14); transform: translateX(3px); }
.ab-legal__policies a:hover i { transform: translateX(3px); }

/* ── 13) CTA CUỐI ────────────────────────────────────────── */
.ab-cta { padding: 26px 0 64px; }
.ab-cta__inner {
    display: grid; grid-template-columns: 1fr auto; gap: 26px; align-items: center;
    background: var(--c-grad); border-radius: 20px; padding: 36px 40px; color: #fff;
    position: relative; overflow: hidden;
    box-shadow: 0 22px 48px rgba(182, 12, 19, .35);
}
.ab-cta__inner::before {
    content: ""; position: absolute; inset: 0;
    background:
        radial-gradient(420px 200px at 90% -20%, rgba(255, 255, 255, .16) 0, transparent 60%),
        repeating-linear-gradient(135deg, rgba(255, 255, 255, .04) 0 1px, transparent 1px 24px);
    pointer-events: none;
}
.ab-cta__copy { position: relative; }
.ab-cta__copy h2 { font-size: clamp(20px, 2.3vw, 27px); font-weight: 800; color: #fff; margin: 0 0 8px; }
.ab-cta__copy p { font-size: 15px; color: rgba(255, 255, 255, .9); margin: 0; max-width: 620px; }
.ab-cta__actions { display: flex; flex-wrap: wrap; gap: 14px; position: relative; }

/* ── RESPONSIVE ──────────────────────────────────────────── */
@media (max-width: 1023px) {
    .ab-hero__grid { grid-template-columns: 1fr; gap: 36px; }
    .ab-hero__media { max-width: 560px; margin-inline: auto; }
    .ab-values { grid-template-columns: repeat(3, 1fr); }
    .ab-method__grid { grid-template-columns: repeat(2, 1fr); gap: 24px 18px; }
    .ab-method__arrow { display: none; }
    .ab-eco__grid, .ab-why__grid { grid-template-columns: repeat(2, 1fr); }
    .ab-legal__grid { grid-template-columns: 1fr; }
    .ab-cta__inner { grid-template-columns: 1fr; }
}
@media (max-width: 639px) {
    .ab-hero { padding: 24px 0 46px; }
    .ab-stats__row { grid-template-columns: repeat(2, 1fr); gap: 14px 0; }
    .ab-stat:nth-child(3) { border-left: 0; }
    .ab-collage { grid-auto-rows: 130px; gap: 10px; }
    .ab-collage__name b { font-size: 11px; }
    .ab-collage__name small { font-size: 9.5px; }
    .ab-collage__item--1, .ab-collage__item--4 { transform: none; }
    .ab-values { grid-template-columns: repeat(2, 1fr); }
    .ab-method__grid { grid-template-columns: 1fr; }
    .ab-eco__grid, .ab-why__grid { grid-template-columns: 1fr; }
    .ab-story__item { padding-left: 66px; }
    .ab-story__dot { width: 46px; height: 46px; font-size: 16px; }
    .ab-story__list::before { left: 22px; }
    .ab-proof .ab-proof__card { grid-template-columns: 1fr; padding: 28px 22px; }
    .ab-cta__inner { padding: 28px 22px; }
}

/* Chồng inline padding CMS nếu block gốc còn sót — trang about là view riêng
   nên không cần, nhưng giữ hero sát header cho liền mạch */
.ab .ab-hero { margin-top: 0; }

/* ═══════════════════════════════════════════════════════════
   RESPONSIVE POLISH — audit PC/Tablet/Mobile (2026-08-03)
   ═══════════════════════════════════════════════════════════ */

/* Tablet: 4 ô số quá chật ở ~760px (label dài wrap 3 dòng) → 2×2 */
@media (max-width: 900px) {
    .ab-stats__row { grid-template-columns: repeat(2, 1fr); gap: 16px 0; }
    .ab-stat:nth-child(3) { border-left: 0; }
}

/* Mobile: bảng so sánh bỏ cuộn ngang → mỗi tiêu chí thành 1 card xếp chồng */
@media (max-width: 639px) {
    .ab-cmp-wrap { overflow: visible; border: 0; box-shadow: none; border-radius: 0; }
    .ab-cmp { min-width: 0; display: block; background: none; }
    .ab-cmp thead { display: none; }
    .ab-cmp tbody { display: grid; gap: 14px; }
    .ab-cmp tbody tr {
        display: grid; background: #fff;
        border: 1px solid var(--c-navy-12); border-radius: 14px; overflow: hidden;
        box-shadow: 0 8px 20px rgba(31, 52, 81, .07);
    }
    .ab-cmp tbody th {
        background: var(--c-navy); color: #fff;
        padding: 11px 16px; font-size: 14.5px;
    }
    .ab-cmp tbody td { border-top: 0; padding: 12px 16px; }
    .ab-cmp tbody td::before {
        display: block; font-size: 11.5px; font-weight: 800;
        letter-spacing: .6px; text-transform: uppercase; margin-bottom: 3px;
    }
    .ab-cmp tbody td:nth-child(2)::before { content: "Tự ôn một mình"; color: #9aa3b2; }
    .ab-cmp tbody td:nth-child(3)::before { content: "Học cùng THS4.0"; color: var(--c-red-dark); }
}

/* Mobile nhỏ: hero đang cao ~994px → nén khoảng đệm còn ~900px */
@media (max-width: 479px) {
    .ab-hero { padding: 18px 0 36px; }
    .ab-crumb { margin-bottom: 18px; }
    .ab-hero__grid { gap: 22px; }
    .ab-hero__lead { margin-bottom: 18px; }
    .ab-hero__cta { gap: 10px; margin-bottom: 16px; }
    .ab-hero__chips { gap: 7px 18px; }
    .ab-collage { grid-auto-rows: 110px; }
}