/* =========================================================================
   Gluconeogenesis — Megaguide · site.css
   Theo skill apple-design, tông học từ pharmapedia.fyi:
   nền trắng ngà ấm, một màu nhấn xanh xám trầm, tiêu đề Manrope giãn chữ âm mạnh,
   số và nhãn nhỏ IBM Plex Mono, chữ thường font hệ thống. Tự đổi sáng/tối theo máy
   (riêng khu học viên luôn tối, xem hoc.css).
   Thanh trên là lớp vật liệu trong mờ; mép dưới chỉ hiện bóng mờ khi nội dung cuộn dưới nó.
   Phản hồi khi chạm nằm ở lúc nhấn xuống (:active), không đợi nhả tay.
   Mobile trước: style gốc cho điện thoại, @media min-width cho màn to hơn.
   z-index: 10 header · 40 thanh mua mobile · 50 banner cookie
   ========================================================================= */

:root {
  color-scheme: light dark;
  --page: #f4f1ea;          /* nền trang: trắng ngà ấm */
  --fill: #fbfaf6;          /* thẻ nổi trên nền */
  --fill-2: #e8e4da;        /* ô nhập, nút xám, rãnh thanh tiến độ */
  --surface: #ffffff;
  --tint: #e9e5f0;          /* nền phần nhấn (cách chấm bằng chứng) */
  --ink: #16171a;
  --ink-2: #45464d;
  --ink-3: #75767d;
  --sep: rgba(30, 30, 40, .12);
  --accent: #4666a0;        /* xanh xám trầm, màu nhấn duy nhất */
  --accent-press: #3a578c;
  --on-accent: #ffffff;
  --accent-ink: #3d5a94;    /* chữ màu nhấn trên nền sáng */
  --accent-tint: rgba(70, 102, 160, .12);
  --ok: #2f7d4a;
  --ok-tint: rgba(47, 125, 74, .12);
  --err: #b42318;
  --err-tint: rgba(180, 35, 24, .1);
  --inverse: #16171a;       /* khối tối (gói Coaching, dải bài test) */
  --on-inverse: #f2f2f3;
  --on-inverse-2: #a3a4ab;
  --material: rgba(244, 241, 234, .82);
  --material-thick: rgba(251, 250, 246, .9);
  --edge: rgba(30, 30, 40, .07);
  --shadow-1: 0 1px 2px rgba(30, 28, 20, .04), 0 2px 10px rgba(30, 28, 20, .04);
  --shadow-2: 0 14px 40px rgba(30, 28, 20, .12), 0 2px 8px rgba(30, 28, 20, .05);

  --font: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI Variable Text", "Segoe UI", system-ui, Roboto, "Helvetica Neue", Arial, sans-serif;
  --display: "Manrope", var(--font);
  --mono: "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;

  --gut: 20px;
  --max: 1080px;
  --r: 18px;
  --r-sm: 12px;
  --top-h: 56px;
  --press: transform 100ms ease-out;
}
@media (prefers-color-scheme: dark) {
  :root {
    --page: #0b0b0d;
    --fill: #16161a;
    --fill-2: #24242a;
    --surface: #1b1b20;
    --tint: #15141c;
    --ink: #f2f2f3;
    --ink-2: #c9c9cf;
    --ink-3: #8e8e96;
    --sep: rgba(255, 255, 255, .1);
    --accent: #8aa6e0;
    --accent-press: #a1b8e8;
    --on-accent: #0b0b0d;
    --accent-ink: #a5bbea;
    --accent-tint: rgba(138, 166, 224, .16);
    --ok: #4cc77a;
    --ok-tint: rgba(76, 199, 122, .14);
    --err: #ff6b5e;
    --err-tint: rgba(255, 107, 94, .14);
    --inverse: #1f1f25;
    --material: rgba(11, 11, 13, .78);
    --material-thick: rgba(22, 22, 26, .88);
    --edge: rgba(255, 255, 255, .07);
    --shadow-1: none;
    --shadow-2: 0 14px 44px rgba(0, 0, 0, .6);
  }
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-padding-top: calc(var(--top-h) + 16px); }
@media (prefers-reduced-motion: no-preference) { html { scroll-behavior: smooth; } }
body {
  margin: 0; background: var(--page); color: var(--ink);
  font: 400 1.0625rem/1.55 var(--font); letter-spacing: -.008em;
  -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility;
  transition: background-color .3s ease, color .3s ease;   /* đổi sáng/tối không giật */
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; }
p { margin: 0 0 1em; }
h1, h2, h3, h4 { margin: 0; font-family: var(--display); font-weight: 600; }
button, input, select, textarea { font: inherit; color: inherit; letter-spacing: inherit; }
a, button, summary, label, input, select { touch-action: manipulation; -webkit-tap-highlight-color: transparent; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; border-radius: 6px; }
::selection { background: var(--accent-tint); }
[hidden] { display: none !important; }

.sr-only { position: absolute !important; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }
.skip { position: absolute; left: 12px; top: -60px; z-index: 100; background: var(--ink); color: var(--page); padding: 10px 14px; border-radius: var(--r-sm); text-decoration: none; font-weight: 600; }
.skip:focus { top: 12px; }
.wrap { width: 100%; max-width: var(--max); margin: 0 auto; padding: 0 var(--gut); }
.todo { color: var(--accent-ink); font-family: var(--mono); font-size: .88em; letter-spacing: 0; }

/* ---------- Kiểu chữ: Manrope giãn chữ âm mạnh khi lớn, gần 0 khi nhỏ ---------- */
.label { display: block; margin: 0 0 12px; font: 600 .875rem/1.3 var(--display); letter-spacing: 0; color: var(--accent-ink); }
.display { font-family: var(--display); font-size: clamp(2.75rem, 10vw, 5rem); line-height: 1; letter-spacing: -.055em; font-weight: 600; }
.h2 { font-family: var(--display); font-size: clamp(2rem, 6.4vw, 3rem); line-height: 1.05; letter-spacing: -.048em; font-weight: 600; margin-bottom: 14px; }
.h3 { font-family: var(--display); font-size: 1.375rem; line-height: 1.2; letter-spacing: -.025em; font-weight: 600; }
.lead { font-size: 1.1875rem; line-height: 1.5; letter-spacing: -.012em; color: var(--ink-2); max-width: 36em; }
.muted { color: var(--ink-3); }
.fine { font-size: .875rem; line-height: 1.45; letter-spacing: 0; color: var(--ink-3); }

/* ---------- Nút: phản hồi ngay khi nhấn xuống ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .45em;
  min-height: 50px; padding: 0 24px; border: 0; border-radius: 999px;
  background: var(--ink); color: var(--page);
  font: 600 1.0625rem/1.2 var(--display); letter-spacing: -.012em; text-decoration: none; text-align: center; white-space: nowrap;
  cursor: pointer; transition: var(--press), background-color .2s, opacity .2s;
}
.btn:active { transform: scale(.97); }
.btn-yolk { background: var(--accent); color: var(--on-accent); }
.btn-yolk:hover { background: var(--accent-press); }
.btn-ink:hover { opacity: .88; }
.btn-ghost { background: var(--fill-2); color: var(--ink); }
.btn-ghost:hover { background: var(--sep); }
.btn-light { background: var(--on-inverse); color: #1d1d1f; }
.btn-light:hover { background: #fff; }
.btn-block { width: 100%; }
.btn .arr { font-weight: 500; }
.btn[disabled] { opacity: .45; cursor: default; }
.textlink {
  display: inline-flex; align-items: center; min-height: 44px; gap: .3em;
  font-weight: 500; color: var(--accent-ink); text-decoration: none;
}
.textlink:hover { text-decoration: underline; text-underline-offset: 3px; }
.textlink:active { opacity: .6; }
.linkbtn { background: none; border: 0; padding: 0; cursor: pointer; }

/* ---------- Thanh trên: vật liệu trong mờ, mép dưới mờ dần khi có nội dung cuộn bên dưới ---------- */
.top {
  position: sticky; top: 0; z-index: 10;
  background: var(--material);
  -webkit-backdrop-filter: saturate(180%) blur(20px); backdrop-filter: saturate(180%) blur(20px);
}
.top::after {
  content: ""; position: absolute; left: 0; right: 0; top: 100%; height: 14px; pointer-events: none;
  background: linear-gradient(var(--edge), transparent); opacity: 0; transition: opacity .2s ease;
}
.is-scrolled .top::after { opacity: 1; }
.top-in { display: flex; align-items: center; gap: 4px; height: var(--top-h); }
.brand { display: flex; align-items: center; gap: 8px; min-height: 44px; margin-right: auto; text-decoration: none; }
.brand-mark { width: 30px; height: 30px; flex: none; object-fit: contain; }
.brand-name { font-family: var(--display); font-size: 1.0625rem; font-weight: 600; letter-spacing: -.025em; }
.top-nav { display: flex; align-items: center; gap: 2px; }
.top-nav a {
  display: inline-flex; align-items: center; min-height: 44px; padding: 0 10px;
  font-size: .9375rem; font-weight: 400; letter-spacing: -.005em; color: var(--ink-2); text-decoration: none; white-space: nowrap;
  transition: color .15s;
}
.top-nav a:hover { color: var(--ink); }
.top-nav a:active { opacity: .6; }
.top-nav .nav-wide { display: none; }
.top-nav .nav-login { min-height: 32px; margin-left: 6px; padding: 0 14px; border-radius: 999px; background: var(--ink); color: var(--page); font-weight: 500; transition: var(--press), opacity .2s; }
.top-nav .nav-login:hover { color: var(--page); opacity: .88; }
.top-nav .nav-login:active { transform: scale(.96); opacity: 1; }

/* ---------- Section ---------- */
.sec { padding: 72px 0; }
.sec-head { max-width: 40em; margin-bottom: 36px; }

/* ---------- Hero ---------- */
.hero { padding: 40px 0 64px; }
.hero-grid { display: grid; gap: 36px; }
.hero h1 { margin-bottom: 18px; }
.hero .lead { margin-bottom: 0; }
.hero-meta { margin: 14px 0 0; font-size: .875rem; color: var(--ink-3); text-align: center; }
.hero-quiz { margin: 4px 0 0; font-size: .9375rem; color: var(--ink-2); text-align: center; }

/* ---------- Thẻ giá ---------- */
.plans { display: grid; gap: 14px; }
.plan {
  position: relative; display: flex; flex-direction: column; gap: 14px;
  padding: 26px 24px 24px; border-radius: 22px; background: var(--fill);
}
.plan-dark { background: var(--inverse); color: var(--on-inverse); }
.plan-name { font-family: var(--display); font-size: 1rem; font-weight: 600; letter-spacing: -.01em; color: var(--ink-2); }
.plan-dark .plan-name { color: var(--on-inverse-2); }
.plan-top { display: flex; align-items: center; justify-content: space-between; gap: 10px; flex-wrap: wrap; }
.plan-price { display: flex; align-items: baseline; flex-wrap: wrap; gap: 4px 10px; margin: 0; }
.plan-price b { font-family: var(--display); font-size: 2.75rem; line-height: 1; font-weight: 600; letter-spacing: -.05em; }
.plan-price span { font-size: .9375rem; color: var(--ink-3); }
.plan-dark .plan-price span { color: var(--on-inverse-2); }
.plan-sub { margin: 0; color: var(--ink-2); }
.plan-dark .plan-sub { color: var(--on-inverse-2); }
.plan-note { margin: 0; font-size: .8125rem; letter-spacing: 0; color: var(--ink-3); text-align: center; }
.plan-dark .plan-note { color: var(--on-inverse-2); }
.chip {
  display: inline-flex; align-items: center; min-height: 26px; padding: 0 10px; border-radius: 999px;
  background: var(--accent-tint); color: var(--accent-ink);
  font-size: .8125rem; font-weight: 600; letter-spacing: 0;
}
.plan-dark .chip { background: rgba(138, 166, 224, .2); color: #b7c8ee; }
.checks { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; }
.checks li { display: grid; grid-template-columns: 20px 1fr; gap: 10px; line-height: 1.4; }
.checks svg { width: 18px; height: 18px; margin-top: 2px; color: var(--ok); }
.plan-dark .checks svg { color: var(--accent); }
.plan .btn { margin-top: auto; }

/* Thẻ giá rút gọn trong hero */
.plan-mini { gap: 10px; padding: 22px 20px 20px; }
.plan-mini .plan-price b { font-size: 2.25rem; }
.plan-mini ul { margin: 0; padding: 0; list-style: none; font-size: .9375rem; color: var(--ink-2); }
.plan-dark.plan-mini ul { color: var(--on-inverse-2); }

/* ---------- Framework ---------- */
.people { list-style: none; margin: 0 0 28px; padding: 0; display: grid; gap: 10px; }
.person {
  display: grid; grid-template-columns: 48px 1fr; gap: 2px 14px; align-items: center;
  padding: 14px 16px; background: var(--fill); border-radius: var(--r);
}
.mono-badge {
  grid-row: span 2; width: 48px; height: 48px; border-radius: 50%;
  display: grid; place-items: center; background: var(--surface); color: var(--ink);
  font: 600 1rem/1 var(--display); letter-spacing: -.02em; box-shadow: var(--shadow-1);
}
.person:nth-child(2n) .mono-badge { background: var(--accent-tint); color: var(--accent-ink); box-shadow: none; }
.person b { font-weight: 600; line-height: 1.3; }
.person span { font-size: .875rem; color: var(--ink-3); line-height: 1.35; letter-spacing: 0; }
.affil { max-width: 44em; font-size: .875rem; letter-spacing: 0; color: var(--ink-3); }

/* ---------- Nhận được gì ---------- */
.inside { display: grid; gap: 14px; }
.box { padding: 26px 24px; border-radius: 22px; background: var(--fill); }
.box-dark { background: var(--inverse); color: var(--on-inverse); }
.box h3 { font-size: 1.1875rem; font-weight: 600; letter-spacing: -.015em; margin-bottom: 14px; }
.box-dark h3 { color: var(--accent); }
.feat { list-style: none; margin: 0; padding: 0; }
.feat li { padding: 12px 0; border-top: 1px solid var(--sep); line-height: 1.45; color: var(--ink-2); }
.box-dark .feat li { border-top-color: rgba(255, 255, 255, .14); color: var(--on-inverse-2); }
.feat li:first-child { border-top: 0; padding-top: 0; }
.feat b { color: var(--ink); font-weight: 600; }
.box-dark .feat b { color: var(--on-inverse); }

/* ---------- Bài test ---------- */
.quiz-band { background: var(--inverse); color: var(--on-inverse); border-radius: 28px; padding: 48px 24px; text-align: center; }
.quiz-band .h2 { color: var(--on-inverse); }
.quiz-band p { color: var(--on-inverse-2); max-width: 30em; margin: 0 auto 24px; }

/* ---------- FAQ: danh sách nhóm, kiểu Cài đặt ---------- */
.faq { margin-top: 8px; background: var(--fill); border-radius: var(--r); overflow: hidden; }
.faq details + details { box-shadow: inset 0 1px 0 var(--sep); }
.faq summary {
  list-style: none; cursor: pointer; display: flex; justify-content: space-between; align-items: center; gap: 16px;
  min-height: 56px; padding: 14px 18px; font-weight: 600; line-height: 1.35; letter-spacing: -.015em;
}
.faq summary:active { background: var(--fill-2); }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: ""; flex: none; width: 9px; height: 9px; margin-right: 4px;
  border-right: 2px solid var(--ink-3); border-bottom: 2px solid var(--ink-3);
  transform: rotate(45deg) translateY(-2px); transition: transform .25s cubic-bezier(.2, .8, .2, 1);
}
.faq details[open] summary::after { transform: rotate(-135deg) translateY(-2px); }
.faq .ans { padding: 0 18px 18px; color: var(--ink-2); }
.faq .ans p:last-child { margin: 0; }
.faq .ans a { color: var(--accent-ink); }

/* ---------- Form ---------- */
.form { display: grid; gap: 18px; padding: 24px 20px; background: var(--fill); border-radius: 22px; }
.field { display: grid; gap: 6px; }
.field label { font-weight: 600; font-size: .9375rem; }
.req { color: var(--err); margin-left: 2px; }
.input {
  width: 100%; min-height: 50px; padding: 12px 16px;
  border: 1.5px solid transparent; border-radius: var(--r-sm); background: var(--surface); font-size: 1.0625rem;
  transition: border-color .15s, box-shadow .15s;
}
.input::placeholder { color: var(--ink-3); }
.input:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 4px var(--accent-tint); }
.input[aria-invalid="true"] { border-color: var(--err); }
.help { font-size: .8125rem; line-height: 1.45; color: var(--ink-3); }
.ferr { display: none; align-items: flex-start; gap: 6px; font-size: .875rem; line-height: 1.4; color: var(--err); font-weight: 500; letter-spacing: 0; }
.ferr.on { display: flex; }
.ferr button { padding: 0; border: 0; background: none; color: var(--ink); font-weight: 600; text-decoration: underline; cursor: pointer; }
.consent-row { display: flex; gap: 12px; align-items: flex-start; font-size: .875rem; line-height: 1.5; color: var(--ink-2); cursor: pointer; letter-spacing: 0; }
.consent-row input { width: 22px; height: 22px; margin: 0; flex: none; accent-color: var(--accent); cursor: pointer; }
.trap { display: none !important; }
.form-status.err { padding: 12px 14px; border-radius: var(--r-sm); background: var(--err-tint); color: var(--err); font-weight: 500; font-size: .875rem; }
.spin { display: none; width: 18px; height: 18px; border-radius: 50%; border: 2.5px solid currentColor; border-right-color: transparent; animation: spin .7s linear infinite; }
.btn[aria-busy="true"] .spin { display: inline-block; }
.btn[aria-busy="true"] .arr { display: none; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ---------- Trang phụ ---------- */
.page { padding: 40px 0 80px; }
.narrow { max-width: 720px; }
.notice { padding: 14px 16px; border-radius: var(--r-sm); background: var(--accent-tint); font-size: .875rem; line-height: 1.5; color: var(--ink-2); letter-spacing: 0; }
.steps { list-style: none; padding: 0; margin: 28px 0; counter-reset: n; background: var(--fill); border-radius: var(--r); }
.steps li { counter-increment: n; display: grid; grid-template-columns: 36px 1fr; gap: 12px; padding: 16px 18px; }
.steps li + li { box-shadow: inset 0 1px 0 var(--sep); }
.steps li::before { content: counter(n); width: 28px; height: 28px; border-radius: 50%; background: var(--accent); color: var(--on-accent); display: grid; place-items: center; font-size: .875rem; font-weight: 700; }
.steps strong { display: block; margin-bottom: 2px; font-weight: 600; }
.steps p { margin: 0; color: var(--ink-2); font-size: .9375rem; }
.soon { display: grid; gap: 12px; margin: 28px 0; padding: 24px 20px; border-radius: var(--r); background: var(--fill); }
.soon-tag { justify-self: start; }
.links-row { display: flex; flex-wrap: wrap; align-items: center; gap: 10px 20px; margin-top: 24px; }
.upsell { margin-top: 32px; padding: 26px 22px; border-radius: 22px; background: var(--inverse); color: var(--on-inverse); }
.upsell p { color: var(--on-inverse-2); }

.legal h1 { margin-bottom: 10px; }
.legal .updated { font-size: .8125rem; color: var(--ink-3); margin-bottom: 28px; }
.legal h2 { font-size: 1.25rem; line-height: 1.3; letter-spacing: -.018em; font-weight: 600; margin: 36px 0 10px; }
.legal p, .legal li { color: var(--ink-2); }
.legal ul { padding-left: 1.2em; }
.legal li { margin-bottom: .45em; }
.legal table { width: 100%; border-collapse: collapse; margin: 8px 0 16px; font-size: .9375rem; }
.legal th, .legal td { text-align: left; vertical-align: top; padding: 10px 8px; border-bottom: 1px solid var(--sep); }
.legal th { font-size: .8125rem; font-weight: 600; color: var(--ink-3); letter-spacing: 0; }
.legal .callout { padding: 18px; border-radius: var(--r); background: var(--inverse); color: var(--on-inverse); }
.legal .callout p { color: var(--on-inverse-2); margin: 0; }
.legal .callout strong { color: var(--on-inverse); }
.toc { padding: 16px 18px; border-radius: var(--r); background: var(--fill); }
.toc ol { margin: 0; padding-left: 1.3em; }
.toc a { display: inline-block; padding: 4px 0; color: var(--accent-ink); text-decoration: none; }

/* ---------- Footer: chữ nhỏ trên nền xám, kiểu chân trang Apple ---------- */
.foot { background: var(--fill); color: var(--ink-3); padding: 40px 0 32px; font-size: .8125rem; line-height: 1.5; letter-spacing: 0; }
.foot a { color: var(--ink-2); text-decoration: none; }
.foot a:hover { text-decoration: underline; text-underline-offset: 3px; }
.foot-grid { display: grid; gap: 24px; }
.foot-brand { display: flex; align-items: center; gap: 10px; font-family: var(--display); font-size: 1.0625rem; font-weight: 600; letter-spacing: -.02em; color: var(--ink); margin-bottom: 6px; }
.foot-brand img { width: 30px; height: 30px; flex: none; }
.foot h2 { font-size: .8125rem; font-weight: 600; color: var(--ink); margin-bottom: 8px; }
.foot ul { list-style: none; margin: 0; padding: 0; display: grid; }
.foot li a, .foot li button {
  display: inline-flex; align-items: center; min-height: 34px;
  background: none; border: 0; padding: 0; cursor: pointer; color: var(--ink-2); font-size: .8125rem; text-decoration: none;
}
.foot li button:hover { text-decoration: underline; text-underline-offset: 3px; }
.foot address { font-style: normal; line-height: 1.8; }
.disclaimer { margin-top: 28px; padding-top: 18px; border-top: 1px solid var(--sep); color: var(--ink-3); }
.disclaimer strong { color: var(--ink-2); }
.foot-bottom { margin-top: 18px; padding-top: 14px; border-top: 1px solid var(--sep); }

/* ---------- Thanh mua dính đáy (mobile): vật liệu trong mờ ---------- */
.mbar {
  position: fixed; left: 10px; right: 10px; z-index: 40;
  bottom: calc(10px + env(safe-area-inset-bottom, 0px));
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 8px 8px 8px 18px; border-radius: 999px;
  background: var(--material-thick);
  -webkit-backdrop-filter: saturate(180%) blur(24px); backdrop-filter: saturate(180%) blur(24px);
  box-shadow: var(--shadow-2), inset 0 0 0 1px var(--edge);
  transform: translate3d(0, 160%, 0); transition: transform .45s cubic-bezier(.2, .9, .25, 1);
}
.mbar.on { transform: none; }
.mbar-txt { font-size: .8125rem; line-height: 1.2; color: var(--ink-3); letter-spacing: 0; }
.mbar-txt b { display: block; font-family: var(--display); font-size: 1.0625rem; font-weight: 600; letter-spacing: -.02em; color: var(--ink); }
.mbar .btn { min-height: 44px; padding: 0 18px; font-size: .9375rem; }

/* ---------- Banner cookie: tấm vật liệu nổi ---------- */
.consent {
  position: fixed; left: 10px; right: 10px; z-index: 50;
  bottom: calc(10px + env(safe-area-inset-bottom, 0px));
  max-width: 460px; margin-left: auto; padding: 16px;
  background: var(--material-thick);
  -webkit-backdrop-filter: saturate(180%) blur(24px); backdrop-filter: saturate(180%) blur(24px);
  border-radius: 20px; box-shadow: var(--shadow-2), inset 0 0 0 1px var(--edge);
  font-size: .875rem; line-height: 1.45; letter-spacing: 0;
}
.consent p { margin: 0 0 12px; color: var(--ink-2); }
.consent a { color: var(--accent-ink); }
.consent-actions { display: flex; gap: 8px; }
.consent .btn { flex: 1; min-height: 44px; padding: 0 14px; font-size: .9375rem; }

/* ---------- Dòng bằng chứng nhỏ trên hero ---------- */
.proof {
  display: inline-flex; align-items: center; gap: 8px; margin: 0 0 20px; padding: 6px 14px 6px 10px;
  border-radius: 999px; background: var(--fill); box-shadow: inset 0 0 0 1px var(--sep);
  font: 500 .875rem/1.2 var(--display); letter-spacing: 0; color: var(--ink-2);
}
.proof-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--ok); box-shadow: 0 0 0 3px var(--ok-tint); }

/* ---------- Phần nền nhấn ---------- */
.sec-tint { background: var(--tint); }

/* ---------- 5 mức bằng chứng ---------- */
.tiers { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; max-width: 720px; }
.tier {
  display: grid; grid-template-columns: 44px 1fr; align-items: start; gap: 8px;
  padding: 18px 20px; border-radius: var(--r); background: var(--fill); box-shadow: var(--shadow-1);
}
.tier-n { padding-top: 4px; font: 500 .8125rem/1 var(--mono); color: var(--accent-ink); }
.tier-b { display: grid; gap: 6px; }
.tier-b b { font: 600 1.25rem/1.2 var(--display); letter-spacing: -.025em; }
.tier-b small { font: 400 .8125rem/1.4 var(--mono); letter-spacing: 0; color: var(--ink-3); }
.marks { display: inline-flex; gap: 6px; margin-top: 6px; }
.marks i { width: 32px; height: 7px; border-radius: 999px; background: var(--fill-2); }
.marks i.on { background: var(--accent); }
.marks-none { font: 500 .75rem/1 var(--mono); color: var(--ink-3); }
.tiers-note { margin-top: 16px; font-family: var(--mono); font-size: .8125rem; }

/* ---------- Ảnh chụp khu học viên ---------- */
.shot { margin: 0; border-radius: 22px; overflow: hidden; background: #0b0b0d; box-shadow: var(--shadow-2), 0 0 0 1px var(--edge); }
.shot img { width: 100%; height: auto; }

/* ---------- Chọn kiểu thanh toán ---------- */
.opts { display: grid; gap: 10px; }
.opt {
  position: relative; display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 12px;
  padding: 14px 16px 14px 46px; border-radius: 14px; background: var(--surface); cursor: pointer;
  box-shadow: inset 0 0 0 1.5px var(--sep); transition: box-shadow .15s, background-color .15s, var(--press);
}
.opt:active { transform: scale(.99); }
.opt input { position: absolute; left: 16px; top: 50%; width: 20px; height: 20px; margin: -10px 0 0; accent-color: var(--accent); cursor: pointer; }
.opt:has(input:checked) { box-shadow: inset 0 0 0 2px var(--accent); background: var(--accent-tint); }
.opt-body { display: grid; gap: 2px; }
.opt-body b { display: flex; align-items: center; gap: 8px; font: 600 1rem/1.25 var(--display); letter-spacing: -.015em; }
.opt-body small, .opt-price small { font-size: .8125rem; color: var(--ink-3); letter-spacing: 0; }
.opt-price { display: grid; justify-items: end; gap: 2px; }
.opt-price b { font: 600 1.375rem/1 var(--display); letter-spacing: -.03em; }
.opt .chip { min-height: 22px; padding: 0 8px; font-size: .75rem; }

/* ---------- Mua lần cuối ---------- */
.end-cta { text-align: center; }
.end-cta .lead { margin: 0 auto 24px; }

/* ======================= Breakpoints: 720 tablet · 1024 desktop ======================= */
@media (max-width: 419.98px) {
  .top .wrap { padding: 0 16px; }
  .top-nav a { padding: 0 8px; }
}
@media (max-width: 719.98px) {
  body.has-mbar .foot { padding-bottom: 104px; }
}
@media (min-width: 720px) {
  :root { --gut: 32px; }
  .mbar { display: none; }
  .top-nav .nav-wide { display: inline-flex; }
  .sec { padding: 104px 0; }
  .hero { padding: 72px 0 96px; }
  .plans { grid-template-columns: 1fr 1fr; align-items: stretch; }
  .people { grid-template-columns: repeat(2, 1fr); }
  .inside { grid-template-columns: 1fr 1fr; }
  .box { padding: 32px; }
  .quiz-band { padding: 72px 48px; }
  .form { padding: 28px; }
  .foot-grid { grid-template-columns: 1.4fr 1fr 1fr; }
  .consent { left: auto; right: 24px; bottom: 24px; }
}
@media (min-width: 1024px) {
  .hero-grid { grid-template-columns: 1.15fr 1fr; align-items: center; gap: 64px; }
  .hero .plans { grid-template-columns: 1fr; }
  .people { grid-template-columns: repeat(5, 1fr); }
  .person { grid-template-columns: 1fr; align-content: start; gap: 6px; padding: 20px 18px; }
  .mono-badge { grid-row: auto; margin-bottom: 8px; }
}

/* ======================= Trợ năng ======================= */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition-duration: .01ms !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; }
  .mbar { transition: opacity .2s ease !important; transform: none; opacity: 0; pointer-events: none; }
  .mbar.on { opacity: 1; pointer-events: auto; }
  .btn:active, .top-nav .nav-login:active { transform: none; }
  .spin { animation: spin 1s linear infinite !important; }
}
@media (prefers-reduced-transparency: reduce) {
  .top, .mbar, .consent { background: var(--page); -webkit-backdrop-filter: none; backdrop-filter: none; }
}
@media (prefers-contrast: more) {
  :root { --sep: rgba(0, 0, 0, .45); --ink-3: #3a3a3c; --material: var(--page); --material-thick: var(--page); }
  .top { box-shadow: 0 1px 0 var(--ink); }
  .plan, .box, .faq, .form, .person, .steps, .soon { box-shadow: inset 0 0 0 1.5px var(--ink); }
  .input { border-color: var(--ink-3); }
}
@media (prefers-contrast: more) and (prefers-color-scheme: dark) {
  :root { --sep: rgba(255, 255, 255, .5); --ink-3: #d2d2d7; }
}
@media print { .top, .mbar, .consent { display: none !important; } body { background: #fff; color: #000; } }