/* MakeTestPro – website. Màu lấy từ giao diện phần mềm: nền điều khiển xanh đậm, xanh dương của logo,
   xanh lá của trạng thái "Đạt". */
:root {
  --ink: #14213D;        /* chữ chính, nền phần đầu */
  --ink-2: #1E2F55;      /* khung mã trên nền đậm */
  --paper: #F5F7FB;      /* nền trang */
  --line: #D7DDE9;
  --blue: #2563EB;       /* hành động */
  --blue-ink: #1D4ED8;
  --pass: #15803D;       /* test đạt */
  --muted: #5A6680;
  --code-fg: #DCE5F7;
  --radius: 8px;
  --font: "Be Vietnam Pro", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "JetBrains Mono", Consolas, "Courier New", monospace;
}
* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--paper); color: var(--ink); font: 400 17px/1.6 var(--font); }
img { max-width: 100%; height: auto; display: block; }
a { color: var(--blue-ink); }
a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible {
  outline: 3px solid #93B4FF; outline-offset: 2px; }
.wrap { max-width: 1160px; margin: 0 auto; padding: 0 24px; }
.narrow { max-width: 760px; }
.mono { font-family: var(--mono); }
.muted { color: var(--muted); }
.skip { position: absolute; left: -999px; top: 8px; background: #fff; padding: 8px 12px; z-index: 10; }
.skip:focus { left: 8px; }

/* ---------- thanh trên ---------- */
.top { background: var(--ink); color: #fff; }
.top-in { display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 64px; flex-wrap: wrap; }
.brand { display: flex; align-items: center; gap: 10px; color: #fff; text-decoration: none; font-weight: 800; font-size: 19px; letter-spacing: -0.01em; }
.nav { display: flex; align-items: center; gap: 4px; flex-wrap: wrap; }
.nav a { color: #C8D3EA; text-decoration: none; padding: 8px 12px; border-radius: 6px; font-weight: 500; font-size: 15px; }
.nav a:hover, .nav a[aria-current] { color: #fff; }
.nav a[aria-current] { box-shadow: inset 0 -2px 0 #6F9BFF; border-radius: 0; }
.nav .nav-trial { color: #fff; background: rgba(255,255,255,.1); }
.nav .nav-trial.is-on, .nav .nav-trial:hover { background: rgba(255,255,255,.18); }
.nav .lang { margin-left: 8px; border: 1px solid rgba(255,255,255,.28); font-size: 14px; }

/* ---------- hero: khuôn -> các tệp test ---------- */
.hero { background: var(--ink); color: #fff; padding: 56px 0 72px; }
.hero-in { display: grid; grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.2fr); gap: 48px; align-items: center; }
.hero h1 { font-size: clamp(34px, 4.6vw, 54px); line-height: 1.08; letter-spacing: -0.025em; font-weight: 800; margin: 0 0 20px; max-width: 14ch; }
.lead { font-size: 18px; color: #C9D4EB; max-width: 52ch; margin: 0 0 28px; }
.note { color: #93A3C5; font-size: 15px; margin: 18px 0 0; }
.actions { display: flex; gap: 12px; flex-wrap: wrap; }
.btn { display: inline-block; font: 600 16px/1 var(--font); padding: 14px 20px; border-radius: var(--radius); text-decoration: none; border: 0; cursor: pointer; }
.btn-primary { background: var(--blue); color: #fff; }
.btn-primary:hover { background: var(--blue-ink); }
.btn-primary[disabled] { opacity: .6; cursor: wait; }
.btn-ghost { color: #fff; box-shadow: inset 0 0 0 1.5px rgba(255,255,255,.4); }
.btn-ghost:hover { box-shadow: inset 0 0 0 1.5px #fff; }
.btn-ghost-dark { color: var(--ink); box-shadow: inset 0 0 0 1.5px var(--ink); }
.btn-quiet { color: var(--blue-ink); }

.demo { margin: 0; display: grid; grid-template-columns: 1.6fr 1fr; background: var(--ink-2); border-radius: 12px; overflow: hidden; border: 1px solid #2D4170; }
.demo-pane { padding: 14px 0 18px; min-width: 0; }
.demo-out { background: #182847; border-left: 1px solid #2D4170; }
.pane-title { font: 600 12.5px var(--mono); color: #8FA2CB; padding: 0 18px 10px; }
.demo pre { margin: 0; padding: 0 18px; overflow-x: auto; font: 13px/1.7 var(--mono); color: var(--code-fg); }
.demo .k { color: #8DB4FF; } .demo .f { color: #7FD4A8; }
.files { list-style: none; margin: 0; padding: 0 12px; font: 13px/1.7 var(--mono); }
.files li { display: grid; grid-template-columns: 1fr auto 62px; gap: 10px; padding: 0 4px; color: var(--code-fg);
  animation: fileIn .35s ease-out both; animation-delay: calc(0.5s + var(--i) * 0.16s); }
.files .sz { color: #8FA2CB; text-align: right; }
.files .st { color: #6BD69B; text-align: right; }
@keyframes fileIn { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: none; } }
@media (prefers-reduced-motion: reduce) { .files li { animation: none; } }

/* ---------- nội dung ---------- */
section h2 { font-size: 30px; line-height: 1.2; letter-spacing: -0.015em; margin: 0 0 24px; font-weight: 800; }
.how { padding: 72px 24px 24px; }
.steps { list-style: none; counter-reset: s; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; }
.steps li { counter-increment: s; border-top: 3px solid var(--ink); padding-top: 16px; }
.steps li::before { content: counter(s); font: 600 14px var(--mono); color: var(--blue-ink); }
.steps h3 { margin: 6px 0 8px; font-size: 20px; }
.steps p { margin: 0; color: #33405C; }
.shot { padding: 48px 24px; }
.shot figure { margin: 0; }
.shot img { border-radius: 10px; border: 1px solid var(--line); box-shadow: 0 18px 40px -24px rgba(20,33,61,.45); }
.shot figcaption { color: var(--muted); font-size: 15px; margin-top: 12px; }
.feats { padding: 32px 24px 8px; }
.feat-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 28px 48px; margin: 0; }
.feat-list dt { font-weight: 700; font-size: 19px; margin-bottom: 4px; }
.feat-list dd { margin: 0; color: #33405C; max-width: 48ch; }
.closing { padding: 24px 24px 80px; display: flex; gap: 16px; align-items: center; flex-wrap: wrap; }

.doc { padding: 48px 24px 72px; }
.doc h1 { font-size: 40px; letter-spacing: -0.02em; line-height: 1.15; margin: 0 0 20px; }
.doc h2 { font-size: 22px; margin: 36px 0 10px; }
.doc p, .doc li { max-width: 68ch; }
.numbered { padding-left: 1.3em; } .numbered li { margin-bottom: 8px; }
.release { display: flex; justify-content: space-between; align-items: center; gap: 16px; flex-wrap: wrap;
  padding: 20px 22px; background: #fff; border: 1px solid var(--line); border-radius: 10px; }
.guide { list-style: none; padding: 0; counter-reset: g; }
.guide li { counter-increment: g; position: relative; padding-left: 44px; }
.guide li::before { content: counter(g); position: absolute; left: 0; top: 34px; width: 28px; height: 28px; border-radius: 50%;
  background: var(--ink); color: #fff; font: 600 14px/28px var(--mono); text-align: center; }
.inline-shot { margin: 32px 0 0; } .inline-shot img { border-radius: 10px; border: 1px solid var(--line); }

.plans { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin: 8px 0 12px; }
.plan { background: #fff; border: 1px solid var(--line); border-radius: 12px; padding: 24px; }
.plan h2 { margin: 0 0 4px; font-size: 20px; }
.plan-main { border: 2px solid var(--ink); }
.price { font-size: 34px; font-weight: 800; letter-spacing: -0.02em; margin: 4px 0 12px; }
.price span { display: block; font-size: 15px; font-weight: 500; color: var(--muted); letter-spacing: 0; margin-top: 2px; }
.plan ul { padding-left: 1.1em; margin: 0 0 20px; }
.about { padding: 40px 24px 8px; }
.about p { max-width: 68ch; color: #33405C; }
.pay { display: grid; grid-template-columns: 240px 1fr; gap: 28px; align-items: start; margin-top: 12px; }
.qr { margin: 0; } .qr img { border: 1px solid var(--line); border-radius: 10px; background: #fff; }
@media (max-width: 560px) { .pay { grid-template-columns: 1fr; } .qr img { max-width: 260px; } }
.bank { border-collapse: collapse; margin-top: 12px; background: #fff; }
.bank th, .bank td { text-align: left; padding: 10px 16px; border: 1px solid var(--line); }
.bank th { font-weight: 600; color: var(--muted); white-space: nowrap; }

/* ---------- form dùng thử ---------- */
.form { display: grid; gap: 16px; margin-top: 24px; max-width: 620px; }
.form label { display: grid; gap: 6px; font-weight: 600; font-size: 15px; }
.form small { font-weight: 400; color: var(--muted); }
.form input[type=text], .form input:not([type]), .form input[type=email], .form input[type=tel] {
  font: 400 16px var(--font); padding: 11px 12px; border: 1.5px solid #C3CCDD; border-radius: 6px; background: #fff; color: var(--ink); }
.form input.mono { font-family: var(--mono); letter-spacing: .02em; }
.form input[aria-invalid=true] { border-color: #C2410C; }
.row2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.check { grid-template-columns: auto 1fr !important; align-items: start; font-weight: 400 !important; }
.check input { margin-top: 5px; width: 18px; height: 18px; }
.form-error { color: #B42318; font-weight: 600; margin: 0; }
.form .btn { justify-self: start; }
.result { margin-top: 28px; padding: 24px; background: #fff; border: 2px solid var(--pass); border-radius: 12px; }
.result h2 { margin-top: 0; color: var(--pass); }
.res-meta { display: flex; gap: 32px; flex-wrap: wrap; margin: 0 0 14px; }
.res-meta dt { color: var(--muted); font-size: 14px; } .res-meta dd { margin: 0; font-weight: 600; }
.keybox { width: 100%; font-size: 13px; padding: 12px; border: 1px solid var(--line); border-radius: 6px; background: var(--paper); color: var(--ink); resize: vertical; word-break: break-all; margin-bottom: 12px; }

.foot { border-top: 1px solid var(--line); background: #fff; }
.foot-in { display: flex; gap: 12px 32px; flex-wrap: wrap; padding: 24px; font-size: 15px; color: var(--muted); align-items: center; }
.foot-in img { display: inline-block; vertical-align: -6px; margin-right: 4px; }

@media (max-width: 900px) {
  .hero-in { grid-template-columns: 1fr; gap: 36px; }
  .steps, .feat-list, .plans { grid-template-columns: 1fr; }
}
@media (max-width: 560px) {
  body { font-size: 16px; }
  .wrap { padding: 0 16px; }
  .demo { grid-template-columns: 1fr; }
  .demo-out { border-left: 0; border-top: 1px solid #2D4170; }
  .row2 { grid-template-columns: 1fr; }
  .nav a { padding: 6px 8px; font-size: 14px; }
  .doc h1 { font-size: 32px; }
}