/* =========================================================================
   Giasubienhoa.vn — stylesheet chính
   Chuyển từ bản thiết kế (inline style) sang hệ class dùng lại được.
   ========================================================================= */

:root {
  /* Màu thương hiệu */
  --gs-navy: #123A7D;
  --gs-blue: #1A5FD0;
  --gs-blue-dark: #124399;
  --gs-green: #1FA55A;
  --gs-green-dark: #167943;

  /* Chữ */
  --gs-text: #22344E;
  --gs-text-2: #3D4F6B;
  --gs-text-3: #4C5F7C;
  --gs-muted: #6B7C95;
  --gs-muted-2: #8A99B0;

  /* Nền & viền */
  --gs-bg: #FFFFFF;
  --gs-bg-soft: #F7FAFE;
  --gs-bg-tint: #EFF6FF;
  --gs-bg-blue: #EAF3FE;
  --gs-bg-green: #E9F6EE;
  --gs-line: #E5EDF8;
  --gs-line-2: #D7E5F7;
  --gs-line-3: #C9DDF6;

  /* Cảnh báo / lưu ý */
  --gs-warn-bg: #FFF8E8;
  --gs-warn-line: #F5DFAE;
  --gs-warn-text: #8A5B0B;
  --gs-warn-text-2: #6B4A0B;

  --gs-radius: 14px;
  --gs-radius-lg: 20px;
  --gs-shadow: 0 8px 24px rgba(18, 58, 125, 0.06);
  --gs-shadow-lg: 0 16px 40px rgba(18, 58, 125, 0.10);

  --gs-font: 'Be Vietnam Pro', system-ui, -apple-system, 'Segoe UI', sans-serif;
  --gs-font-script: 'Dancing Script', cursive;
}

/* ---------- Reset & base ---------- */
*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 90px; }

body {
  margin: 0;
  background: var(--gs-bg);
  font-family: var(--gs-font);
  font-size: 15px;
  line-height: 1.6;
  color: var(--gs-text);
  -webkit-font-smoothing: antialiased;
}

a { color: var(--gs-blue); text-decoration: none; transition: color .16s ease; }
a:hover { color: var(--gs-blue-dark); }

img { max-width: 100%; height: auto; }

h1, h2, h3, h4 { color: var(--gs-navy); letter-spacing: -0.01em; text-wrap: pretty; }

/* Chỉ hiện cho screen reader */
.gs-sr {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}
.gs-skip:focus {
  position: fixed; top: 10px; left: 10px; z-index: 999; width: auto; height: auto;
  clip: auto; padding: 10px 18px; background: var(--gs-navy); color: #fff; border-radius: 8px;
}

/* ---------- Layout ---------- */
.gs-wrap { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.gs-section { padding: 64px 0; }
.gs-section--tight { padding: 40px 0; }
.gs-section--soft { background: var(--gs-bg-soft); border-top: 1px solid var(--gs-line); }
.gs-section--blue { background: var(--gs-bg-blue); }

.gs-h2 { margin: 0 0 6px; font-weight: 800; font-size: clamp(23px, 2.6vw, 28px); }
.gs-lead { margin: 0 0 24px; font-size: 15px; color: var(--gs-text-3); }
.gs-head-row { display: flex; align-items: center; gap: 12px; margin-bottom: 20px; }
.gs-head-row .gs-h2 { margin: 0; }

/* ---------- Nút ---------- */
.gs-btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  height: 50px; padding: 0 28px; border: 1px solid transparent; border-radius: 12px;
  font-family: var(--gs-font); font-size: 15.5px; font-weight: 700;
  white-space: nowrap; cursor: pointer; transition: background .16s ease, border-color .16s ease, color .16s ease;
}
.gs-btn--primary { background: var(--gs-blue); color: #fff; box-shadow: 0 12px 28px rgba(26, 95, 208, .26); }
.gs-btn--primary:hover { background: var(--gs-blue-dark); color: #fff; }
.gs-btn--ghost { background: #fff; border-color: var(--gs-line-3); color: var(--gs-navy); }
.gs-btn--ghost:hover { background: var(--gs-bg-tint); border-color: var(--gs-blue); color: var(--gs-navy); }
.gs-btn--green { background: var(--gs-green); color: #fff; }
.gs-btn--green:hover { background: var(--gs-green-dark); color: #fff; }
.gs-btn--sm { height: 44px; padding: 0 22px; font-size: 14px; border-radius: 10px; }
.gs-btn--block { width: 100%; }

/* ---------- Header ---------- */
.gs-header {
  position: sticky; top: 0; z-index: 50;
  background: #fff; border-bottom: 1px solid var(--gs-line);
}
.gs-header__top {
  max-width: 1200px; margin: 0 auto; padding: 12px 24px;
  display: flex; flex-wrap: wrap; align-items: center; gap: 12px 16px;
}
.gs-logo { display: flex; align-items: center; gap: 10px; flex: none; }
.gs-logo__text { display: flex; flex-direction: column; line-height: 1.2; }
.gs-logo__name { font-weight: 800; font-size: 19px; letter-spacing: -0.01em; color: var(--gs-blue); }
.gs-logo__name em { font-style: normal; color: var(--gs-green); }
.gs-logo__slogan { font-size: 11px; color: var(--gs-muted); }
.gs-header__cta { display: flex; gap: 8px; flex: none; margin-left: auto; }
.gs-pill {
  display: inline-flex; align-items: center; height: 44px; padding: 0 20px;
  border-radius: 999px; font-size: 14.5px; font-weight: 700; transition: all .16s ease;
}
.gs-pill--green { background: var(--gs-bg-green); border: 1px solid #BEE6CE; color: var(--gs-green-dark); }
.gs-pill--green:hover { background: var(--gs-green); border-color: var(--gs-green); color: #fff; }
.gs-pill--navy { background: var(--gs-navy); color: #fff; padding: 0 24px; }
.gs-pill--navy:hover { background: var(--gs-blue); color: #fff; }

.gs-burger {
  display: none; width: 44px; height: 44px; border: 1px solid var(--gs-line-2);
  border-radius: 10px; background: #fff; cursor: pointer; align-items: center; justify-content: center;
}

/* ---------- Menu chính ---------- */
.gs-nav { border-top: 1px solid var(--gs-line); }
.gs-nav__inner {
  max-width: 1200px; margin: 0 auto; padding: 0 24px;
  display: flex; justify-content: space-between;
}
.gs-nav__item { position: relative; }
.gs-nav__link {
  display: inline-flex; align-items: center; gap: 8px; padding: 14px 6px;
  font-size: 13.5px; font-weight: 700; letter-spacing: .03em;
  color: var(--gs-navy); text-transform: uppercase;
}
.gs-nav__link:hover { color: var(--gs-blue); }
.gs-nav__caret { transition: transform .16s ease; }
.gs-nav__panel {
  position: absolute; top: 100%; left: 50%; transform: translateX(-50%);
  background: #fff; border: 1px solid var(--gs-line); border-radius: var(--gs-radius);
  box-shadow: 0 18px 40px rgba(18, 58, 125, .14); padding: 10px;
  min-width: 220px; display: grid; gap: 2px; z-index: 60;
  opacity: 0; visibility: hidden; pointer-events: none; transition: opacity .14s ease;
}
.gs-nav__item--start > .gs-nav__panel { left: 0; right: auto; transform: none; }
.gs-nav__item--end > .gs-nav__panel { left: auto; right: 0; transform: none; }
.gs-nav__item:hover > .gs-nav__panel,
.gs-nav__item:focus-within > .gs-nav__panel { opacity: 1; visibility: visible; pointer-events: auto; }

.gs-nav__sub { position: relative; }
.gs-nav__sublink {
  display: flex; align-items: center; gap: 12px; padding: 9px 14px; border-radius: 9px;
  font-size: 13.5px; font-weight: 500; color: var(--gs-text-2); white-space: nowrap;
}
.gs-nav__sublink:hover { background: var(--gs-bg-tint); color: var(--gs-blue); }
.gs-nav__sublink svg { margin-left: auto; }
.gs-nav__panel--deep {
  position: absolute; top: -10px; left: 100%; margin-left: 6px; transform: none;
  min-width: 190px;
}
.gs-nav__sub:hover > .gs-nav__panel--deep,
.gs-nav__sub:focus-within > .gs-nav__panel--deep { opacity: 1; visibility: visible; pointer-events: auto; }

/* ---------- Hero ---------- */
.gs-hero { position: relative; background-color: var(--gs-bg-tint); background-size: cover; background-position: 100% center; background-repeat: no-repeat; }
.gs-hero__veil {
  position: absolute; inset: 0; pointer-events: none;
  background: linear-gradient(90deg, rgba(255,255,255,.95) 0%, rgba(255,255,255,.88) 38%, rgba(255,255,255,.35) 60%, rgba(255,255,255,0) 78%);
}
.gs-hero__inner { position: relative; max-width: 1200px; margin: 0 auto; padding: 72px 24px 64px; min-height: 400px; display: grid; align-items: center; }
.gs-hero__body { max-width: 560px; }
.gs-hero__title { margin: 0 0 10px; font-weight: 800; font-size: clamp(34px, 4.6vw, 56px); line-height: 1.12; letter-spacing: -0.02em; }
.gs-hero__title em { font-style: normal; color: var(--gs-green); }
.gs-hero__script { margin: 0 0 24px; font-family: var(--gs-font-script); font-weight: 600; font-size: 28px; color: var(--gs-blue); }
.gs-hero__points { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 10px 22px; margin-bottom: 28px; }
.gs-hero__actions { display: flex; flex-wrap: wrap; gap: 12px; }
.gs-hero__tags { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin-top: 16px; }
.gs-hero__tags-label { font-size: 13px; font-weight: 600; color: var(--gs-muted); }

.gs-check {
  display: flex; align-items: flex-start; gap: 8px;
  font-size: 14.5px; font-weight: 600; color: var(--gs-text); line-height: 1.45;
}
.gs-check svg { flex: none; margin-top: 2px; }

.gs-tag {
  display: inline-block; font-size: 12.5px; font-weight: 500; color: var(--gs-blue);
  background: #fff; border: 1px solid var(--gs-line-2); border-radius: 999px; padding: 5px 13px;
}
.gs-tag:hover { border-color: var(--gs-blue); }

/* ---------- Carousel (môn học / khối lớp) ---------- */
.gs-carousel-nav { display: flex; gap: 8px; margin-left: auto; }
.gs-carousel-btn {
  width: 40px; height: 40px; border-radius: 50%; border: 1px solid var(--gs-line-2);
  background: #fff; cursor: pointer; display: flex; align-items: center; justify-content: center;
  transition: all .16s ease;
}
.gs-carousel-btn:hover { border-color: var(--gs-blue); background: var(--gs-bg-tint); }
.gs-rail {
  display: flex; gap: 12px; overflow-x: auto; scroll-snap-type: x mandatory;
  padding: 10px 2px 14px; margin: -10px -2px -14px; scrollbar-width: none;
}
.gs-rail::-webkit-scrollbar { display: none; }

.gs-subject-card {
  flex: 0 0 132px; scroll-snap-align: start;
  display: flex; flex-direction: column; align-items: center; gap: 10px;
  background: var(--gs-bg-soft); border: 1px solid var(--gs-line); border-radius: var(--gs-radius);
  padding: 20px 8px 16px; color: var(--gs-text); transition: all .18s ease;
}
.gs-subject-card:hover {
  border-color: var(--gs-blue); background: var(--gs-bg-tint); color: var(--gs-navy);
  transform: translateY(-3px); box-shadow: 0 10px 22px rgba(18, 58, 125, .10);
}
.gs-subject-card__icon { width: 46px; height: 46px; border-radius: 12px; display: flex; align-items: center; justify-content: center; }
.gs-subject-card__name { font-size: 13.5px; font-weight: 600; text-align: center; }

.gs-grade-card {
  flex: 0 0 110px; scroll-snap-align: start;
  display: flex; align-items: center; justify-content: center; height: 52px;
  background: var(--gs-bg-soft); border: 1px solid var(--gs-line); border-radius: 12px;
  font-size: 15px; font-weight: 700; color: var(--gs-text); transition: all .16s ease;
}
.gs-grade-card:hover { border-color: var(--gs-blue); background: var(--gs-blue); color: #fff; }

/* ---------- Dải điểm mạnh ---------- */
.gs-features { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 28px; }
.gs-feature { display: flex; gap: 14px; align-items: flex-start; }
.gs-feature__icon { flex: none; width: 48px; height: 48px; border-radius: 50%; display: flex; align-items: center; justify-content: center; }
.gs-feature__title { display: block; font-size: 15px; font-weight: 700; color: var(--gs-navy); margin-bottom: 4px; }
.gs-feature__desc { display: block; font-size: 13.5px; line-height: 1.55; color: var(--gs-text-3); }

/* ---------- Quy trình ---------- */
.gs-steps { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 18px; }
.gs-step {
  background: var(--gs-bg-soft); border: 1px solid var(--gs-line); border-radius: 16px;
  padding: 24px 22px; display: flex; flex-direction: column; gap: 12px; transition: all .18s ease;
}
.gs-step:hover { border-color: var(--gs-blue); background: var(--gs-bg-tint); }
.gs-step__head { display: flex; align-items: center; gap: 12px; }
.gs-step__n {
  flex: none; width: 40px; height: 40px; border-radius: 12px; background: var(--gs-blue);
  color: #fff; font-size: 17px; font-weight: 800; display: flex; align-items: center; justify-content: center;
}
.gs-step__time { font-size: 12px; font-weight: 700; letter-spacing: .06em; text-transform: uppercase; color: var(--gs-green); }
.gs-step__title { font-size: 16px; font-weight: 700; color: var(--gs-navy); line-height: 1.35; }
.gs-step__desc { font-size: 14px; line-height: 1.6; color: var(--gs-text-3); }

/* ---------- Hộp lưu ý ---------- */
.gs-note {
  margin-top: 18px; background: var(--gs-warn-bg); border: 1px solid var(--gs-warn-line);
  border-radius: var(--gs-radius); padding: 18px 22px;
  display: flex; flex-wrap: wrap; gap: 10px 18px; align-items: flex-start;
}
.gs-note__label { font-size: 14px; font-weight: 800; color: var(--gs-warn-text); white-space: nowrap; }
.gs-note__list { flex: 1 1 320px; display: grid; gap: 8px; margin: 0; padding: 0; list-style: none; }
.gs-note__list li { font-size: 13.5px; line-height: 1.55; color: var(--gs-warn-text-2); }
.gs-note__list li::before { content: "• "; }

/* ---------- Bảng giá ---------- */
.gs-price {
  border: 1px solid var(--gs-line); border-radius: 18px; overflow: hidden;
  box-shadow: var(--gs-shadow); width: 100%; border-collapse: collapse;
}
.gs-price thead th {
  padding: 15px 20px; font-size: 13.5px; font-weight: 700; color: #fff;
  background: var(--gs-navy); text-align: left;
}
.gs-price tbody tr { border-top: 1px solid var(--gs-line); }
.gs-price tbody tr:nth-child(even) { background: var(--gs-bg-soft); }
.gs-price td { padding: 16px 20px; font-size: 14.5px; color: var(--gs-text-2); }
.gs-price td:first-child { font-weight: 700; color: var(--gs-navy); }
.gs-price td:last-child { font-weight: 700; color: var(--gs-green-dark); }
.gs-price-foot { margin-top: 16px; display: flex; flex-wrap: wrap; gap: 10px 24px; align-items: center; }
.gs-price-foot__note { font-size: 13px; color: var(--gs-muted); }
.gs-price-foot .gs-btn { margin-left: auto; }

/* ---------- Vì sao chọn ---------- */
.gs-why { display: grid; grid-template-columns: repeat(auto-fit, minmax(460px, 1fr)); gap: 24px; }
.gs-why__card { border-radius: var(--gs-radius-lg); padding: 36px; }
.gs-why__card--blue { background: var(--gs-bg-blue); display: grid; grid-template-columns: minmax(0, 200px) minmax(240px, 1fr); gap: 24px; align-items: center; }
.gs-why__card--green { background: var(--gs-bg-green); position: relative; }
.gs-why__img { width: 100%; max-width: 240px; aspect-ratio: 1 / 1; object-fit: contain; display: block; }
.gs-why__script { margin: 0 0 12px; font-family: var(--gs-font-script); font-weight: 700; font-size: 32px; line-height: 1.2; color: var(--gs-navy); }
.gs-why__text { margin: 0 0 20px; font-size: 14px; line-height: 1.65; color: var(--gs-text-3); }
.gs-why__list { display: grid; gap: 13px; margin: 0; padding: 0; list-style: none; }
.gs-why__list li { display: flex; align-items: flex-start; gap: 10px; font-size: 14.5px; font-weight: 500; color: var(--gs-text); line-height: 1.5; }
.gs-why__list svg { flex: none; margin-top: 1px; }
.gs-why__stamp {
  position: absolute; right: 28px; bottom: 24px; margin: 0;
  font-family: var(--gs-font-script); font-weight: 700; font-size: 22px; line-height: 1.3;
  color: var(--gs-green); transform: rotate(-5deg); text-align: center;
}

/* ---------- Số liệu ---------- */
.gs-stats {
  background: var(--gs-bg-soft); border: 1px solid var(--gs-line); border-radius: var(--gs-radius-lg);
  padding: 32px 24px; display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 24px;
}
.gs-stat { display: flex; align-items: center; gap: 16px; justify-content: center; }
.gs-stat__value { font-weight: 800; font-size: 28px; color: var(--gs-navy); line-height: 1.1; display: block; }
.gs-stat__label { font-size: 13px; font-weight: 500; color: var(--gs-muted); }

/* ---------- Cảm nhận phụ huynh ---------- */
.gs-quotes { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 20px; }
.gs-quote {
  margin: 0; background: #fff; border: 1px solid var(--gs-line); border-radius: 16px; padding: 24px;
  display: flex; flex-direction: column; gap: 18px; box-shadow: 0 6px 18px rgba(18, 58, 125, .05);
}
.gs-quote blockquote { margin: 0; font-size: 14.5px; line-height: 1.65; color: var(--gs-text-2); }
.gs-quote figcaption { display: flex; align-items: center; gap: 12px; margin-top: auto; }
.gs-quote__avatar { width: 44px; height: 44px; border-radius: 50%; object-fit: cover; flex: none; }
.gs-quote__name { display: block; font-size: 14px; font-weight: 700; color: var(--gs-navy); }
.gs-quote__role { font-size: 12.5px; color: var(--gs-muted); }

/* ---------- Khối form đăng ký ---------- */
.gs-signup { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr); gap: 48px; align-items: center; }
.gs-signup__title { margin: 0 0 12px; font-weight: 800; font-size: clamp(26px, 3vw, 34px); }
.gs-signup__text { margin: 0 0 24px; font-size: 15px; line-height: 1.7; color: var(--gs-text-3); }
.gs-signup__text strong { color: var(--gs-navy); }
.gs-signup__steps { display: grid; gap: 14px; margin: 0; padding: 0; list-style: none; }
.gs-signup__steps li { display: flex; align-items: flex-start; gap: 12px; font-size: 14.5px; line-height: 1.55; color: var(--gs-text); font-weight: 500; }
.gs-signup__n {
  flex: none; width: 28px; height: 28px; border-radius: 50%; background: var(--gs-green);
  color: #fff; font-size: 13px; font-weight: 800; display: flex; align-items: center; justify-content: center;
}

.gs-form {
  background: #fff; border: 1px solid var(--gs-line); border-radius: 18px; padding: 28px;
  display: grid; grid-template-columns: 1fr 1fr; gap: 14px; box-shadow: var(--gs-shadow-lg);
}
.gs-form--full { grid-template-columns: 1fr; }
.gs-form__full { grid-column: 1 / -1; }
.gs-form input[type="text"],
.gs-form input[type="tel"],
.gs-form input[type="email"],
.gs-form select,
.gs-form textarea {
  box-sizing: border-box; width: 100%; min-width: 0; height: 46px;
  border: 1px solid var(--gs-line); border-radius: 10px; background: var(--gs-bg-soft);
  padding: 0 14px; font-family: var(--gs-font); font-size: 14px; color: var(--gs-text);
  transition: border-color .16s ease, background .16s ease;
}
.gs-form textarea { height: auto; padding: 12px 14px; resize: vertical; line-height: 1.55; }
.gs-form input:focus, .gs-form select:focus, .gs-form textarea:focus {
  outline: none; border-color: var(--gs-blue); background: #fff;
}
.gs-form input[aria-invalid="true"], .gs-form select[aria-invalid="true"] { border-color: #D8386B; background: #FDEBF0; }
.gs-form__hint { grid-column: 1 / -1; margin: 0; text-align: center; font-size: 12.5px; color: var(--gs-muted-2); }
.gs-form__label { display: block; font-size: 13px; font-weight: 700; color: var(--gs-navy); margin-bottom: 6px; }
.gs-form__chips { display: flex; flex-wrap: wrap; gap: 8px; }
.gs-form__chip { position: relative; }
.gs-form__chip input { position: absolute; opacity: 0; pointer-events: none; }
.gs-form__chip span {
  display: inline-block; padding: 8px 15px; border: 1px solid var(--gs-line);
  border-radius: 999px; background: var(--gs-bg-soft); font-size: 13.5px; font-weight: 600;
  color: var(--gs-text-2); cursor: pointer; transition: all .14s ease;
}
.gs-form__chip input:checked + span { background: var(--gs-blue); border-color: var(--gs-blue); color: #fff; }
.gs-form__chip input:focus-visible + span { outline: 2px solid var(--gs-blue); outline-offset: 2px; }

/* Mật ong chống bot — ẩn hẳn khỏi người dùng lẫn screen reader */
.gs-hp { position: absolute !important; left: -9999px !important; }

.gs-alert { grid-column: 1 / -1; border-radius: 10px; padding: 12px 16px; font-size: 14px; line-height: 1.55; }
.gs-alert--ok { background: var(--gs-bg-green); border: 1px solid #BEE6CE; color: var(--gs-green-dark); }
.gs-alert--err { background: #FDEBF0; border: 1px solid #F5C2D2; color: #C42A59; }

/* ---------- Dải CTA cuối ---------- */
.gs-cta-band {
  position: relative; background-color: var(--gs-bg-blue); background-size: cover;
  background-position: center bottom; padding: 72px 0; overflow: hidden;
}
.gs-cta-band__card {
  position: relative; justify-self: center; max-width: 620px; text-align: center;
  background: rgba(255, 255, 255, .88); border-radius: var(--gs-radius-lg); padding: 32px 36px;
  box-shadow: 0 14px 36px rgba(18, 58, 125, .14); margin: 0 auto;
}
.gs-cta-band__title { margin: 0 0 8px; font-weight: 800; font-size: clamp(24px, 3vw, 32px); }
.gs-cta-band__text { margin: 0 0 24px; font-size: 15px; font-weight: 500; color: var(--gs-navy); }

/* ---------- Footer ---------- */
.gs-footer { background: var(--gs-bg-soft); border-top: 1px solid var(--gs-line); }
.gs-footer__cols {
  max-width: 1200px; margin: 0 auto; padding: 48px 24px 36px;
  display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 36px 32px;
}
.gs-footer__brand { display: flex; flex-direction: column; gap: 14px; }
.gs-footer__about { margin: 0; font-size: 13.5px; line-height: 1.7; color: var(--gs-text-3); }
.gs-footer__social { display: flex; flex-wrap: wrap; gap: 10px; }
.gs-footer__social a {
  display: inline-flex; align-items: center; height: 38px; padding: 0 16px; border-radius: 999px;
  background: #fff; border: 1px solid var(--gs-line-2); font-size: 13px; font-weight: 700; color: var(--gs-blue);
}
.gs-footer__social a:hover { border-color: var(--gs-blue); background: var(--gs-bg-blue); }
.gs-footer__title {
  margin: 0 0 14px; font-size: 13px; font-weight: 800; letter-spacing: .06em;
  text-transform: uppercase; color: var(--gs-navy);
}
.gs-footer__contact { display: grid; gap: 11px; margin: 0; padding: 0; list-style: none; }
.gs-footer__contact li { display: flex; align-items: flex-start; gap: 9px; font-size: 13.5px; line-height: 1.6; color: var(--gs-text-3); }
.gs-footer__contact svg { flex: none; margin-top: 2px; }
.gs-footer__contact a { color: var(--gs-text-3); }
.gs-footer__contact a.gs-strong { font-weight: 800; color: var(--gs-blue); }
.gs-footer__nav { display: grid; gap: 10px; font-size: 13.5px; font-weight: 500; margin: 0; padding: 0; list-style: none; }
.gs-footer__nav a { color: var(--gs-text-3); }
.gs-footer__nav a:hover { color: var(--gs-blue); }
.gs-footer__bar { border-top: 1px solid var(--gs-line); background: #fff; }
.gs-footer__bar-inner {
  max-width: 1200px; margin: 0 auto; padding: 16px 24px;
  display: flex; flex-wrap: wrap; gap: 8px 20px; align-items: center;
  font-size: 12.5px; color: var(--gs-muted-2);
}
.gs-footer__bar-inner span:last-child { margin-left: auto; }

/* ---------- Trang môn học (landing) ---------- */
.gs-breadcrumb { font-size: 13px; color: var(--gs-muted); margin-bottom: 16px; }
.gs-breadcrumb a { color: var(--gs-muted); }
.gs-breadcrumb a:hover { color: var(--gs-blue); }

.gs-subject-hero { background: var(--gs-bg-tint); border-bottom: 1px solid var(--gs-line); padding: 48px 0 56px; }
.gs-subject-hero__title { margin: 0 0 14px; font-weight: 800; font-size: clamp(30px, 4.4vw, 50px); line-height: 1.14; letter-spacing: -0.02em; }
.gs-subject-hero__tagline { margin: 0 0 22px; font-size: 16px; line-height: 1.7; color: var(--gs-text-3); max-width: 720px; }

.gs-benefits { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 18px; }
.gs-benefit {
  background: #fff; border: 1px solid var(--gs-line); border-radius: 16px; padding: 22px;
  display: flex; flex-direction: column; gap: 10px;
}
.gs-benefit__icon { width: 44px; height: 44px; border-radius: 12px; display: flex; align-items: center; justify-content: center; }
.gs-benefit__title { font-size: 15.5px; font-weight: 700; color: var(--gs-navy); }
.gs-benefit__desc { font-size: 13.5px; line-height: 1.6; color: var(--gs-text-3); }

.gs-levels { display: grid; grid-template-columns: repeat(auto-fit, minmax(270px, 1fr)); gap: 18px; }
.gs-level {
  background: var(--gs-bg-soft); border: 1px solid var(--gs-line); border-radius: 16px; padding: 24px 22px;
  display: flex; flex-direction: column; gap: 12px;
}
.gs-level__head { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.gs-level__name { font-size: 17px; font-weight: 800; color: var(--gs-navy); }
.gs-level__tag {
  font-size: 11.5px; font-weight: 700; letter-spacing: .05em; text-transform: uppercase;
  color: var(--gs-green-dark); background: var(--gs-bg-green); border-radius: 999px; padding: 4px 10px;
}
.gs-level__items { margin: 0; padding: 0; list-style: none; display: grid; gap: 9px; }
.gs-level__items li { display: flex; align-items: flex-start; gap: 8px; font-size: 14px; line-height: 1.55; color: var(--gs-text-3); }
.gs-level__items svg { flex: none; margin-top: 3px; }
.gs-level__link { margin-top: auto; font-size: 13.5px; font-weight: 700; }

.gs-two-col { display: grid; grid-template-columns: repeat(auto-fit, minmax(340px, 1fr)); gap: 24px; }
.gs-panel { background: #fff; border: 1px solid var(--gs-line); border-radius: 18px; padding: 28px; }
.gs-panel--soft { background: var(--gs-bg-soft); }
.gs-panel--green { background: var(--gs-bg-green); border-color: #BEE6CE; }
.gs-panel__title { margin: 0 0 12px; font-weight: 800; font-size: 22px; }

.gs-method { display: grid; gap: 14px; margin: 0; padding: 0; list-style: none; }
.gs-method li { display: flex; gap: 12px; align-items: flex-start; }
.gs-method__n {
  flex: none; width: 30px; height: 30px; border-radius: 50%; background: var(--gs-blue); color: #fff;
  font-size: 13px; font-weight: 800; display: flex; align-items: center; justify-content: center;
}
.gs-method__title { display: block; font-size: 14.5px; font-weight: 700; color: var(--gs-navy); }
.gs-method__desc { display: block; font-size: 13.5px; line-height: 1.55; color: var(--gs-text-3); }

.gs-signals { display: grid; gap: 12px; margin: 0; padding: 0; list-style: none; }
.gs-signals li { display: flex; align-items: flex-start; gap: 10px; font-size: 14px; line-height: 1.6; color: var(--gs-text-2); }
.gs-signals svg { flex: none; margin-top: 2px; }

.gs-areas { display: flex; flex-wrap: wrap; gap: 10px; }
.gs-areas a, .gs-areas span {
  display: inline-block; padding: 9px 16px; background: var(--gs-bg-soft);
  border: 1px solid var(--gs-line); border-radius: 999px; font-size: 14px;
  font-weight: 600; color: var(--gs-text-2);
}
.gs-areas a:hover { border-color: var(--gs-blue); background: var(--gs-bg-tint); color: var(--gs-blue); }

.gs-faq { display: grid; gap: 12px; }
.gs-faq__item { background: var(--gs-bg-soft); border: 1px solid var(--gs-line); border-radius: var(--gs-radius); padding: 20px 22px; }
.gs-faq__q { margin: 0 0 8px; font-size: 16px; font-weight: 700; line-height: 1.45; color: var(--gs-navy); }
.gs-faq__a { margin: 0; font-size: 14px; line-height: 1.65; color: var(--gs-text-3); }

.gs-related { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 14px; }
.gs-related a {
  display: flex; align-items: center; gap: 12px; background: #fff; border: 1px solid var(--gs-line);
  border-radius: 12px; padding: 16px 18px; font-size: 14.5px; font-weight: 600; color: var(--gs-text);
  transition: all .16s ease;
}
.gs-related a:hover { border-color: var(--gs-blue); background: var(--gs-bg-tint); color: var(--gs-blue); }

/* ---------- Trang gia sư ---------- */
.gs-gs-hero { background: linear-gradient(135deg, #E9F6EE 0%, #F3F9FF 60%, #EAF3FE 100%); }
.gs-gs-hero__inner {
  max-width: 1200px; margin: 0 auto; padding: 56px 24px 48px;
  display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  gap: 48px; align-items: center;
}
.gs-gs-hero__title { margin: 0 0 10px; font-weight: 800; font-size: clamp(32px, 4.4vw, 54px); line-height: 1.12; letter-spacing: -0.02em; }
.gs-gs-hero__script { margin: 0 0 24px; font-family: var(--gs-font-script); font-weight: 600; font-size: 28px; color: var(--gs-green); }

/* Huy hiệu đếm lớp đang mở */
.gs-badge-open {
  display: inline-flex; align-items: center; gap: 8px; background: #fff;
  border: 1px solid #BEE6CE; border-radius: 999px; padding: 7px 16px;
  font-size: 13px; font-weight: 700; color: var(--gs-green-dark); margin-bottom: 16px;
}

/* Ảnh gia sư + dòng chữ viết tay đè lên góc */
.gs-gs-hero__art { position: relative; }
.gs-gs-hero__art img { display: block; width: 100%; max-width: 440px; margin: 0 auto; }
.gs-gs-hero__note {
  position: absolute; right: 12px; bottom: 12px; margin: 0; pointer-events: none;
  font-family: var(--gs-font-script); font-weight: 700; font-size: 23px; line-height: 1.3;
  color: var(--gs-navy); background: rgba(255, 255, 255, .92); border-radius: 12px;
  padding: 8px 16px; transform: rotate(-4deg);
}

/* Dải số liệu nền xanh đậm */
.gs-metrics { background: var(--gs-navy); padding: 28px 0; }
.gs-metrics__inner {
  max-width: 1200px; margin: 0 auto; padding: 0 24px;
  display: grid; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); gap: 20px;
}
.gs-metric { display: flex; flex-direction: column; gap: 2px; align-items: center; text-align: center; }
.gs-metric__value { font-weight: 800; font-size: 26px; color: #fff; line-height: 1.15; }
.gs-metric__label { font-size: 13px; font-weight: 500; color: #A9C6EE; }

/* Khối "Giữ đúng nội quy" có ảnh đập tay */
.gs-highfive {
  background: linear-gradient(120deg, #EAF3FE 0%, #F0F8F3 100%); border-radius: var(--gs-radius-lg);
  padding: 28px 32px; margin: 20px 0;
  display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px 32px; align-items: center;
}
.gs-highfive img { display: block; width: 100%; max-width: 360px; justify-self: center; }
.gs-highfive__title { margin: 0 0 10px; font-weight: 800; font-size: 20px; }
.gs-highfive__text { margin: 0 0 18px; font-size: 14.2px; line-height: 1.7; color: var(--gs-text-3); }
.gs-highfive__actions { display: grid; gap: 10px; justify-items: start; }

.gs-filters { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 20px; }
.gs-filter {
  padding: 9px 18px; border: 1px solid var(--gs-line); border-radius: 999px;
  background: var(--gs-bg-soft); font-family: var(--gs-font); font-size: 14px; font-weight: 600;
  color: var(--gs-text-2); cursor: pointer; transition: all .14s ease;
}
.gs-filter:hover { border-color: var(--gs-blue); color: var(--gs-blue); }
.gs-filter.is-active { background: var(--gs-blue); border-color: var(--gs-blue); color: #fff; }

.gs-classes { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 18px; }
.gs-class {
  background: #fff; border: 1px solid var(--gs-line); border-radius: 16px; padding: 22px;
  display: flex; flex-direction: column; gap: 12px; box-shadow: var(--gs-shadow);
}
.gs-class__head { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.gs-class__code { font-size: 12.5px; font-weight: 700; color: var(--gs-muted); letter-spacing: .04em; }
.gs-class__badge { font-size: 11.5px; font-weight: 800; letter-spacing: .05em; text-transform: uppercase; border-radius: 999px; padding: 4px 11px; margin-left: auto; }
.gs-class__badge--gap { background: #FDEBF0; color: #C42A59; }
.gs-class__badge--new { background: var(--gs-bg-green); color: var(--gs-green-dark); }
.gs-class__badge--open { background: var(--gs-bg-blue); color: var(--gs-blue); }
.gs-class__title { margin: 0; font-size: 17.5px; font-weight: 800; color: var(--gs-navy); line-height: 1.35; }
.gs-class__pay { font-size: 15px; font-weight: 800; color: var(--gs-green-dark); }
.gs-class__meta { margin: 0; padding: 0; list-style: none; display: grid; gap: 7px; }
.gs-class__meta li { display: flex; align-items: flex-start; gap: 8px; font-size: 13.5px; line-height: 1.55; color: var(--gs-text-3); }
.gs-class__meta svg { flex: none; margin-top: 3px; }
.gs-class__foot { margin-top: auto; padding-top: 4px; }
.gs-empty { padding: 40px 24px; text-align: center; color: var(--gs-muted); font-size: 15px; background: var(--gs-bg-soft); border: 1px dashed var(--gs-line-2); border-radius: var(--gs-radius); }

/* Hai cột cam kết: gia sư (xanh lá) ↔ trung tâm (xanh dương) */
.gs-pledge {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(380px, 1fr));
  gap: 20px; margin-bottom: 20px;
}
.gs-pledge__card { border-radius: var(--gs-radius-lg); padding: 32px; }
.gs-pledge__card--green { background: var(--gs-bg-green); }
.gs-pledge__card--blue { background: var(--gs-bg-blue); }
.gs-pledge__eyebrow {
  margin: 0 0 18px; font-size: 13px; font-weight: 800; letter-spacing: .06em; text-transform: uppercase;
}
.gs-pledge__eyebrow--green { color: var(--gs-green-dark); }
.gs-pledge__eyebrow--blue { color: var(--gs-blue); }

.gs-rules { display: grid; gap: 14px; margin: 0; padding: 0; list-style: none; }
.gs-rules li { display: flex; gap: 12px; align-items: flex-start; font-size: 14.2px; font-weight: 500; line-height: 1.6; color: var(--gs-text); }
.gs-rules svg { flex: none; margin-top: 3px; }
.gs-rules__n {
  flex: none; width: 24px; height: 24px; border-radius: 8px; background: var(--gs-green);
  color: #fff; font-size: 12px; font-weight: 800; display: flex; align-items: center;
  justify-content: center; margin-top: 1px;
}

.gs-fee {
  background: var(--gs-warn-bg); border: 1px solid var(--gs-warn-line); border-radius: var(--gs-radius-lg);
  padding: 32px; display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px 28px; align-items: start;
}
.gs-fee__head { grid-column: 1 / -1; }
.gs-fee__title { margin: 0 0 8px; font-weight: 800; font-size: 20px; color: var(--gs-warn-text); }
.gs-fee__intro { margin: 0; font-size: 14px; line-height: 1.7; color: var(--gs-warn-text-2); max-width: 860px; }
.gs-fee__card { background: #fff; border: 1px solid #EBD3A2; border-radius: var(--gs-radius); padding: 20px; }
.gs-fee__label {
  margin: 0 0 8px; font-size: 12px; font-weight: 800; letter-spacing: .05em;
  text-transform: uppercase; color: var(--gs-warn-text);
}
.gs-fee__formula { margin: 0 0 12px; font-size: 14.5px; font-weight: 700; line-height: 1.5; color: var(--gs-navy); }
.gs-fee__example { margin: 0; font-size: 13.2px; line-height: 1.65; color: var(--gs-text-3); }
.gs-fee__example strong { color: var(--gs-green-dark); }
.gs-fee__notes { margin: 0; padding: 0; list-style: none; display: grid; gap: 9px; align-content: start; }
.gs-fee__notes li { font-size: 13.2px; line-height: 1.6; color: var(--gs-warn-text-2); }
.gs-fee__notes li::before { content: "• "; }

.gs-refund { width: 100%; border-collapse: collapse; border: 1px solid var(--gs-line); border-radius: 18px; overflow: hidden; box-shadow: var(--gs-shadow); }
.gs-refund thead th { padding: 15px 20px; font-size: 13.5px; font-weight: 700; color: #fff; background: var(--gs-navy); text-align: left; }
.gs-refund tbody tr { border-top: 1px solid var(--gs-line); }
.gs-refund tbody tr:nth-child(even) { background: var(--gs-bg-soft); }
.gs-refund td { padding: 15px 20px; font-size: 14px; line-height: 1.55; color: var(--gs-text-2); }
.gs-refund td:last-child { font-weight: 700; white-space: nowrap; }

.gs-tips { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 18px; }
.gs-tip { background: var(--gs-bg-soft); border: 1px solid var(--gs-line); border-radius: 16px; padding: 22px; }
.gs-tip__n { font-size: 26px; font-weight: 800; color: var(--gs-line-2); line-height: 1; display: block; margin-bottom: 10px; }
.gs-tip__title { display: block; font-size: 15.5px; font-weight: 700; color: var(--gs-navy); margin-bottom: 6px; }
.gs-tip__desc { font-size: 13.5px; line-height: 1.6; color: var(--gs-text-3); }

.gs-referral { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 18px; }
.gs-referral__card { background: #fff; border: 1px solid var(--gs-line); border-radius: 16px; padding: 24px; }
.gs-referral__reward { display: block; margin-top: 12px; font-size: 20px; font-weight: 800; color: var(--gs-green-dark); }

/* ---------- Tin tức ---------- */
.gs-featured {
  position: relative; border-radius: var(--gs-radius-lg); overflow: hidden;
  background: var(--gs-navy); color: #fff; margin-bottom: 36px; min-height: 300px;
  display: flex; align-items: flex-end;
}
.gs-featured img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; opacity: .45; }
.gs-featured__body { position: relative; padding: 36px; max-width: 720px; }
.gs-featured__title { margin: 0 0 12px; font-weight: 800; font-size: clamp(22px, 2.4vw, 28px); line-height: 1.3; color: #fff; }
.gs-featured__excerpt { margin: 0 0 18px; font-size: 14.5px; line-height: 1.65; color: rgba(255, 255, 255, .88); }

.gs-posts { display: grid; grid-template-columns: repeat(auto-fit, minmax(290px, 1fr)); gap: 24px; }
.gs-post {
  display: flex; flex-direction: column; background: #fff; border: 1px solid var(--gs-line);
  border-radius: 16px; overflow: hidden; transition: all .18s ease;
}
.gs-post:hover { border-color: var(--gs-line-3); box-shadow: 0 12px 28px rgba(18, 58, 125, .10); transform: translateY(-2px); }
.gs-post__thumb { display: block; aspect-ratio: 16 / 9; object-fit: cover; width: 100%; background: var(--gs-bg-blue); }
.gs-post__body { padding: 20px 22px 22px; display: flex; flex-direction: column; gap: 10px; flex: 1; }
.gs-post__cat { font-size: 12px; font-weight: 800; letter-spacing: .05em; text-transform: uppercase; color: var(--gs-green-dark); }
.gs-post__title { margin: 0; font-size: 17px; font-weight: 700; line-height: 1.4; color: var(--gs-navy); }
.gs-post__title a { color: inherit; }
.gs-post__title a:hover { color: var(--gs-blue); }
.gs-post__excerpt { margin: 0; font-size: 13.5px; line-height: 1.6; color: var(--gs-text-3); }
.gs-post__meta { margin-top: auto; padding-top: 6px; font-size: 12.5px; color: var(--gs-muted-2); }

.gs-clusters { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 18px; }
.gs-cluster { background: var(--gs-bg-soft); border: 1px solid var(--gs-line); border-radius: 16px; padding: 24px; }
.gs-cluster__title { margin: 0 0 6px; font-weight: 800; font-size: 17px; }
.gs-cluster__desc { margin: 0 0 14px; font-size: 13.5px; line-height: 1.6; color: var(--gs-text-3); }
.gs-cluster__links { margin: 0; padding: 0; list-style: none; display: grid; gap: 8px; font-size: 13.5px; }

.gs-pagination { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; margin-top: 36px; }
.gs-pagination .page-numbers {
  display: inline-flex; align-items: center; justify-content: center; min-width: 42px; height: 42px;
  padding: 0 14px; border: 1px solid var(--gs-line); border-radius: 10px; background: #fff;
  font-size: 14px; font-weight: 700; color: var(--gs-text-2);
}
.gs-pagination .page-numbers:hover { border-color: var(--gs-blue); color: var(--gs-blue); }
.gs-pagination .page-numbers.current { background: var(--gs-blue); border-color: var(--gs-blue); color: #fff; }

/* ---------- Bài viết ---------- */
.gs-article { display: grid; grid-template-columns: minmax(0, 1fr) 300px; gap: 40px; align-items: start; }
.gs-article__title { margin: 0 0 16px; font-weight: 800; font-size: clamp(26px, 3.8vw, 40px); line-height: 1.22; letter-spacing: -0.02em; }
.gs-article__meta { display: flex; flex-wrap: wrap; gap: 8px 16px; font-size: 13px; color: var(--gs-muted); margin-bottom: 24px; }
.gs-article__hero { width: 100%; border-radius: var(--gs-radius-lg); margin-bottom: 28px; }

.gs-prose { font-size: 16px; line-height: 1.75; color: var(--gs-text-2); }
.gs-prose > * + * { margin-top: 18px; }
.gs-prose h2 { margin: 36px 0 12px; font-weight: 800; font-size: 24px; line-height: 1.3; }
.gs-prose h3 { margin: 28px 0 10px; font-weight: 700; font-size: 18.5px; }
.gs-prose ul, .gs-prose ol { padding-left: 22px; }
.gs-prose li + li { margin-top: 8px; }
.gs-prose img { border-radius: var(--gs-radius); }
.gs-prose blockquote {
  margin: 24px 0; padding: 18px 22px; background: var(--gs-bg-soft);
  border-left: 4px solid var(--gs-blue); border-radius: 0 12px 12px 0; color: var(--gs-text-3);
}
.gs-prose table { width: 100%; border-collapse: collapse; font-size: 14.5px; }
.gs-prose th, .gs-prose td { padding: 12px 14px; border: 1px solid var(--gs-line); text-align: left; }
.gs-prose th { background: var(--gs-bg-soft); color: var(--gs-navy); font-weight: 700; }
.gs-prose a { text-decoration: underline; text-underline-offset: 2px; }

.gs-toc { background: var(--gs-bg-soft); border: 1px solid var(--gs-line); border-radius: var(--gs-radius); padding: 20px 22px; }
.gs-toc__title { margin: 0 0 12px; font-size: 13px; font-weight: 800; letter-spacing: .06em; text-transform: uppercase; color: var(--gs-navy); }
.gs-toc ol { margin: 0; padding-left: 18px; display: grid; gap: 8px; font-size: 13.5px; }
.gs-toc a { color: var(--gs-text-3); }
.gs-toc a:hover { color: var(--gs-blue); }

.gs-aside { position: sticky; top: 100px; display: grid; gap: 20px; }
.gs-aside__card { background: var(--gs-bg-blue); border-radius: var(--gs-radius); padding: 24px; }
.gs-aside__title { margin: 0 0 10px; font-weight: 800; font-size: 18px; }
.gs-aside__text { margin: 0 0 16px; font-size: 13.5px; line-height: 1.6; color: var(--gs-text-3); }

/* ---------- Nút gọi nổi (mobile) ---------- */
.gs-callbar { display: none; }

/* ---------- Responsive ---------- */
@media (max-width: 1023px) {
  .gs-signup { grid-template-columns: 1fr; gap: 32px; }
  .gs-article { grid-template-columns: 1fr; gap: 28px; }
  .gs-aside { position: static; }
  .gs-why { grid-template-columns: 1fr; }

  /* Ảnh gia sư xuống dưới phần chữ, thu nhỏ lại */
  .gs-gs-hero__inner { grid-template-columns: 1fr; gap: 32px; }
  .gs-gs-hero__art { order: -1; }
  .gs-gs-hero__art img { max-width: 320px; }
  .gs-gs-hero__note { font-size: 19px; right: 0; }
}

@media (max-width: 860px) {
  .gs-burger { display: flex; }
  .gs-header__cta { display: none; }
  .gs-nav {
    display: none; position: absolute; left: 0; right: 0; top: 100%;
    background: #fff; border-bottom: 1px solid var(--gs-line);
    box-shadow: 0 18px 40px rgba(18, 58, 125, .14); max-height: 78vh; overflow-y: auto;
  }
  .gs-nav.is-open { display: block; }
  .gs-nav__inner { flex-direction: column; padding: 8px 16px 20px; }
  .gs-nav__item { border-bottom: 1px solid var(--gs-line); }
  .gs-nav__item:last-child { border-bottom: none; }
  .gs-nav__link { width: 100%; padding: 14px 4px; }
  .gs-nav__panel,
  .gs-nav__panel--deep {
    position: static; transform: none !important; opacity: 1; visibility: visible;
    pointer-events: auto; box-shadow: none; border: none; padding: 0 0 12px 12px;
    min-width: 0; display: none; margin-left: 0;
  }
  .gs-nav__item.is-open > .gs-nav__panel,
  .gs-nav__sub.is-open > .gs-nav__panel--deep { display: grid; }
  .gs-nav__item:hover > .gs-nav__panel { opacity: 1; }

  .gs-header { position: relative; }
  .gs-header__top { position: relative; }

  .gs-why__card--blue { grid-template-columns: 1fr; text-align: center; justify-items: center; }
  .gs-why__stamp { position: static; margin-top: 20px; transform: none; text-align: left; }

  /* Bảng giá xoay dọc trên điện thoại */
  .gs-price, .gs-price thead, .gs-price tbody, .gs-price th, .gs-price td, .gs-price tr { display: block; }
  .gs-price thead { display: none; }
  .gs-price tbody tr { border-top: 1px solid var(--gs-line); padding: 6px 0; }
  .gs-price td { padding: 8px 18px; display: flex; gap: 12px; justify-content: space-between; }
  .gs-price td::before { content: attr(data-label); font-weight: 700; color: var(--gs-muted); font-size: 13px; }
  .gs-price td:first-child::before { content: none; }
  .gs-price-foot .gs-btn { margin-left: 0; }

  .gs-refund, .gs-refund tbody, .gs-refund tr, .gs-refund td { display: block; }
  .gs-refund thead { display: none; }
  .gs-refund tbody tr { border-top: 1px solid var(--gs-line); padding: 8px 0; }
  .gs-refund td:last-child { white-space: normal; }

  .gs-callbar {
    display: flex; position: fixed; left: 0; right: 0; bottom: 0; z-index: 60;
    background: #fff; border-top: 1px solid var(--gs-line); padding: 10px 14px;
    gap: 10px; box-shadow: 0 -6px 20px rgba(18, 58, 125, .10);
  }
  .gs-callbar .gs-btn { flex: 1; height: 46px; padding: 0 14px; font-size: 14.5px; }
  body { padding-bottom: 70px; }
}

@media (max-width: 600px) {
  .gs-wrap { padding: 0 16px; }
  .gs-section { padding: 44px 0; }
  .gs-hero__inner { padding: 48px 16px 44px; min-height: 0; }
  .gs-hero { background-position: 78% center; }
  .gs-form { grid-template-columns: 1fr; padding: 22px; }
  .gs-form__full { grid-column: auto; }
  .gs-why__card { padding: 26px; }
  .gs-panel { padding: 22px; }
  .gs-featured__body { padding: 24px; }
  .gs-footer__cols { padding: 36px 16px 28px; }
  .gs-footer__bar-inner span:last-child { margin-left: 0; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; animation: none !important; }
}