/* EngViet / Dịch Lấy Ngay — one stylesheet for both languages */
:root {
  --paper: #ffffff;
  --ink: #17202a;
  --slate: #5a6573;
  --hairline: #e2e5e9;
  --wash: #f5f7f9;
  --proof: #c62828;
  --radius: 8px;
  --grid: #eef1f6;
  --grid-strong: #dde3ec;
  --night: #121a23;
  --night-text: #a7b1bd;
  --proof-night: #ff7a70;
  --serif: "Newsreader", Georgia, serif;
  --sans: "Be Vietnam Pro", -apple-system, "Segoe UI", sans-serif;
}
* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 400 17px/1.6 var(--sans);
  -webkit-font-smoothing: antialiased;
}
a { color: var(--ink); text-underline-offset: 3px; }
a:hover { color: var(--proof); }
:focus-visible { outline: 2px solid var(--proof); outline-offset: 2px; }

.wrap { max-width: 1120px; margin: 0 auto; padding: 0 24px; }

/* Header */
.top { border-bottom: 1px solid var(--hairline); }
.top .wrap { display: flex; align-items: center; justify-content: space-between; height: 64px; gap: 24px; }
.brand { font: 600 21px/1 var(--serif); text-decoration: none; letter-spacing: -0.01em; }
.top nav { display: flex; align-items: center; gap: 28px; font-size: 15px; }
.top nav a { text-decoration: none; color: var(--slate); }
.top nav a:hover { color: var(--ink); }
.top nav .switch { color: var(--ink); border: 1px solid var(--hairline); border-radius: var(--radius); padding: 5px 12px; }

/* Hero: Vietnamese school-notebook grid (vở ô li), fading out behind the headline */
.hero-band { position: relative; isolation: isolate; border-bottom: 1px solid var(--hairline); overflow: hidden; }
.hero-band::before {
  content: ""; position: absolute; inset: 0; z-index: -2;
  background-image:
    linear-gradient(var(--grid-strong) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-strong) 1px, transparent 1px),
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 48px 48px, 48px 48px, 12px 12px, 12px 12px;
  -webkit-mask-image: linear-gradient(90deg, transparent 22%, #000 62%);
  mask-image: linear-gradient(90deg, transparent 22%, #000 62%);
}

/* Hero */
.hero { display: grid; grid-template-columns: 1.05fr 1fr; gap: 64px; align-items: center; padding-top: 88px; padding-bottom: 96px; }
h1 {
  font: 500 clamp(40px, 5vw, 60px)/1.05 var(--serif);
  letter-spacing: -0.025em;
  margin: 0 0 24px;
}
.lead { font-size: 19px; color: var(--slate); max-width: 34em; margin: 0 0 32px; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }
.btn {
  display: inline-block; background: var(--ink); color: #fff; border: 0; border-radius: var(--radius);
  padding: 13px 22px; font: 600 16px/1 var(--sans); text-decoration: none; cursor: pointer;
}
.btn:hover { color: #fff; background: #000; }
.btn-quiet { background: none; color: var(--ink); border: 1px solid var(--hairline); }
.btn-quiet:hover { background: var(--wash); color: var(--ink); }

/* Specimen: source line + proofed translation */
.specimen { position: relative; margin: 0; background: var(--paper); border: 1px solid var(--hairline); border-radius: var(--radius); padding: 32px 32px 28px; }
.specimen::before, .specimen::after {
  content: ""; position: absolute; inset: 0; z-index: -1; background: var(--paper);
  border: 1px solid var(--hairline); border-radius: var(--radius);
}
.specimen::before { transform: rotate(-2.2deg) translate(-6px, 8px); }
.specimen::after { transform: rotate(1.6deg) translate(8px, 4px); }
.specimen .kind { font-size: 14px; color: var(--slate); margin: 0 0 20px; }
.specimen .src { font-size: 17px; color: var(--slate); margin: 0 0 18px; padding-bottom: 18px; border-bottom: 1px dashed var(--hairline); }
.specimen .dst { font: 400 27px/1.38 var(--serif); margin: 0; }
.specimen del {
  color: var(--slate); text-decoration: none;
  background: linear-gradient(var(--proof), var(--proof)) no-repeat 0 58% / 0 2px;
  animation: strike .55s .5s ease-out forwards;
}
.specimen ins { text-decoration: none; color: var(--proof); font-style: italic; opacity: 0; animation: reveal .4s 1.1s ease-out forwards; }
@keyframes strike { to { background-size: 100% 2px; } }
@keyframes reveal { to { opacity: 1; } }
.specimen .note { margin: 20px 0 0; font-size: 14px; color: var(--proof); }
.specimen .dots { display: flex; gap: 6px; margin-top: 22px; }
.specimen .dots button { width: 22px; height: 4px; border: 0; padding: 0; border-radius: 2px; background: var(--hairline); cursor: pointer; }
.specimen .dots button[aria-current="true"] { background: var(--ink); }
.specimen .frame { transition: opacity .35s ease; }
.specimen .frame.out { opacity: 0; }

/* Delivery-time strip */
.speeds { display: grid; grid-template-columns: repeat(3, 1fr); }
.speeds div { padding: 36px 24px 36px 0; }
.speeds div + div { padding-left: 32px; border-left: 1px solid var(--hairline); }
.speeds b { display: block; font: 500 clamp(32px, 4vw, 48px)/1 var(--serif); letter-spacing: -0.02em; }
.speeds span { display: block; margin-top: 8px; color: var(--slate); font-size: 15px; }

/* Sections */
section { padding: 80px 0; border-top: 1px solid var(--hairline); }
h2 { font: 500 clamp(30px, 3.6vw, 40px)/1.15 var(--serif); letter-spacing: -0.015em; margin: 0 0 16px; }
.intro { color: var(--slate); max-width: 38em; margin: 0 0 40px; }
h3 { font-size: 18px; font-weight: 600; margin: 0 0 6px; }

.kinds { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0; padding: 0; margin: 0; list-style: none; border-top: 1px solid var(--hairline); border-left: 1px solid var(--hairline); }
.kinds li { padding: 28px 24px; border-right: 1px solid var(--hairline); border-bottom: 1px solid var(--hairline); }
.kinds strong { display: block; font-weight: 600; margin-bottom: 4px; }
.kinds span { color: var(--slate); font-size: 15px; }
.kinds .pair { display: block; font: 400 24px/1.3 var(--serif); color: var(--ink); margin-bottom: 18px; }
.kinds .pair i { color: var(--proof); }

.how { background: var(--wash); border-top: 0; }
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 40px; padding: 0; margin: 0; list-style: none; }
.steps li { border-top: 2px solid var(--ink); padding-top: 20px; }
.steps .num { display: block; font: 500 56px/1 var(--serif); color: var(--proof); margin-bottom: 18px; }
.steps p { color: var(--slate); margin: 0; }

/* Languages band */
.langs { background: var(--night); color: #fff; border-top: 0; }
.langs h2 { color: #fff; }
.langs .intro { color: var(--night-text); }
.hellos { display: flex; flex-wrap: wrap; gap: 6px 28px; margin: 0; padding: 0; list-style: none; font: 400 clamp(28px, 4vw, 46px)/1.25 var(--serif); }
.hellos li { color: rgba(255, 255, 255, .42); }
.hellos li.home { color: #fff; }
.hellos li.home::after { content: "*"; color: var(--proof-night); }
.langs .small { color: var(--night-text); margin-top: 32px; }

/* Pricing + estimator */
.price-grid { display: grid; grid-template-columns: 1.2fr 1fr; gap: 48px; align-items: start; }
table.price { width: 100%; border-collapse: collapse; font-size: 16px; }
.price th, .price td { text-align: left; padding: 14px 10px 14px 0; border-bottom: 1px solid var(--hairline); vertical-align: top; }
.price th { font-weight: 500; color: var(--slate); font-size: 14px; }
.price td:first-child { font-weight: 600; }
.price td + td { white-space: nowrap; }
.small { font-size: 14px; color: var(--slate); margin: 14px 0 0; }

.panel { background: var(--wash); border-radius: var(--radius); padding: 28px; }
label { display: block; font-size: 15px; font-weight: 500; margin-bottom: 16px; }
input, select, textarea {
  display: block; width: 100%; margin-top: 6px; padding: 11px 12px;
  border: 1px solid #cfd4da; border-radius: var(--radius); font: 400 16px/1.4 var(--sans); background: #fff; color: var(--ink);
}
textarea { resize: vertical; }
.total { display: flex; justify-content: space-between; align-items: baseline; border-top: 1px solid #cfd4da; padding-top: 16px; margin-top: 4px; }
.total output { font: 500 34px/1 var(--serif); }

/* Quote */
.quote-grid { display: grid; grid-template-columns: 1fr 1.2fr; gap: 64px; align-items: start; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 0 16px; }
.form-msg { font-size: 15px; margin: 12px 0 0; }

/* Payment */
.pay-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.pay { border: 1px solid var(--hairline); border-radius: var(--radius); padding: 28px; }
.pay p { color: var(--slate); margin: 0 0 10px; }
.qr { display: block; width: 200px; max-width: 100%; margin: 16px 0; }

/* FAQ */
.faq details { border-bottom: 1px solid var(--hairline); padding: 18px 0; max-width: 820px; }
.faq summary { cursor: pointer; font-weight: 600; font-size: 18px; list-style: none; display: flex; justify-content: space-between; gap: 16px; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; font: 400 24px/1 var(--serif); color: var(--slate); }
.faq details[open] summary::after { content: "–"; }
.faq details p { color: var(--slate); margin: 12px 0 0; max-width: 42em; }

/* Footer */
footer { background: var(--night); color: var(--night-text); padding: 56px 0 48px; font-size: 14px; }
footer .wrap { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: flex-end; gap: 16px; }
footer .sign { font: 500 34px/1 var(--serif); color: #fff; display: block; margin-bottom: 10px; }
footer a { color: #fff; }
footer a:hover { color: var(--proof-night); }

@media (max-width: 900px) {
  .hero, .price-grid, .quote-grid { grid-template-columns: 1fr; gap: 40px; }
  .hero { padding-top: 56px; padding-bottom: 64px; }
  .steps { grid-template-columns: 1fr; gap: 28px; }
  .kinds { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
  .wrap { padding-left: 16px; padding-right: 16px; }
  .top nav a:not(.switch) { display: none; }
  section { padding: 56px 0; }
  .kinds { grid-template-columns: 1fr; }
  .speeds { grid-template-columns: 1fr; }
  .speeds div, .speeds div + div { padding: 20px 0; border-left: 0; border-top: 1px solid var(--hairline); }
  .speeds div:first-child { border-top: 0; }
  .hero-band::before { -webkit-mask-image: linear-gradient(180deg, transparent 35%, #000 70%); mask-image: linear-gradient(180deg, transparent 35%, #000 70%); }
  .pay-grid, .form-row { grid-template-columns: 1fr; }
  .specimen { padding: 24px 20px; }
  .specimen .dst { font-size: 23px; }
  table.price { font-size: 15px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .specimen .frame { transition: none; }
  .specimen del { animation: none; background-size: 100% 2px; }
  .specimen ins { animation: none; opacity: 1; }
}

/* Quote request sits on a wash band; its form panel turns white */
#quote { background: var(--wash); border-top: 0; }
#quote .panel { background: var(--paper); border: 1px solid var(--hairline); }