/* Typing Speed Test: WPM Coach — style-03 "Night Terminal": navy · cyan · mono · bento.
   Dark first, light via prefers-color-scheme. Only external asset: JetBrains Mono (Google Fonts), ui-monospace fallback. */
:root {
  --bg: #0B0F14; --card: #121923; --surface: #1A2330; --line: #243142;
  --ink: #E8EEF5; --ink-2: #9AA9BB; --ink-3: #6F7F92;
  --cyan: #2DD4FF; --on-cyan: #04222B; --good: #3DDC97; --bad: #FF5C7A; --warn: #FFB020;
  --cyan-soft: rgba(45,212,255,.12); --h1: #12506a; --h2: #1a8caf; --key-lip: #0E6E8C;
  --mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color-scheme: dark;
}
@media (prefers-color-scheme: light) {
  :root {
    --bg: #F3F5F8; --card: #FFFFFF; --surface: #E7ECF2; --line: #D5DCE5;
    --ink: #0B0F14; --ink-2: #4A5A6C; --ink-3: #6B7A8C;
    --cyan: #0BB8E6; --good: #1FB877; --bad: #E0365A; --warn: #E89A00;
    --cyan-soft: rgba(11,184,230,.12); --h1: #BEE9F6; --h2: #6CCDEB; --key-lip: #0BB8E6;
    color-scheme: light;
  }
}
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 116px; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 400 16px/1.6 var(--sans); -webkit-font-smoothing: antialiased; overflow-x: hidden; }
img, svg { display: block; max-width: 100%; }
a { color: inherit; }
h1, h2, h3, p { margin: 0; }
ul { margin: 0; padding: 0; list-style: none; }
button { font: inherit; color: inherit; }
::selection { background: var(--cyan); color: var(--on-cyan); }
:focus-visible { outline: 2px solid var(--cyan); outline-offset: 3px; border-radius: 6px; }
.wrap { width: 100%; max-width: 1120px; margin: 0 auto; padding: 0 16px; }
.mono { font-family: var(--mono); font-variant-numeric: tabular-nums; }
.label { font: 700 11px/1.3 var(--mono); letter-spacing: .1em; text-transform: uppercase; color: var(--ink-3); }
h1, h2, h3 { font-family: var(--mono); font-weight: 800; letter-spacing: -.02em; overflow-wrap: anywhere; }
h1 { font-size: clamp(27px, 7.6vw, 56px); line-height: 1.12; }
h2 { font-size: clamp(22px, 5.6vw, 36px); line-height: 1.18; }
h3 { font-size: 16px; line-height: 1.3; }
.cyan { color: var(--cyan); }
.sub { color: var(--ink-2); font-size: 17px; max-width: 56ch; }
.cur { display: inline-block; width: .55em; height: 1em; margin-left: .08em; background: var(--cyan); vertical-align: -.12em; animation: blink 1.06s steps(1) infinite; }
@keyframes blink { 50% { opacity: 0; } }

/* buttons: rectangular, 12px */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 12px; min-height: 52px; padding: 0 22px; border-radius: 12px; border: 1px solid var(--line); background: transparent; color: var(--ink); font: 700 15px/1 var(--mono); text-decoration: none; cursor: pointer; transition: border-color .15s, background .15s; }
.btn:hover { border-color: var(--cyan); }
.btn-c { background: var(--cyan); border-color: var(--cyan); color: var(--on-cyan); }
.btn-c:hover { filter: brightness(1.08); }
.btn-play { padding: 0 24px 0 18px; text-align: left; }
.btn-play span { display: flex; flex-direction: column; line-height: 1.15; }
.btn-play small { font-size: 10px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; opacity: .8; }
.btn-play strong { font-size: 17px; font-weight: 800; }
.btn-sm { min-height: 36px; padding: 0 14px; font-size: 13px; }

/* header: logo row + segmented tabs (top, like the app) */
.top { position: sticky; top: 0; z-index: 50; background: color-mix(in srgb, var(--bg) 92%, transparent); -webkit-backdrop-filter: blur(10px); backdrop-filter: blur(10px); border-bottom: 1px solid var(--line); }
.bar { display: flex; align-items: center; gap: 10px; min-height: 56px; }
.logo { font: 800 24px/1 var(--mono); letter-spacing: -.03em; text-decoration: none; margin-right: auto; display: inline-flex; align-items: baseline; }
.logo i { font-style: normal; color: var(--cyan); animation: blink 1.06s steps(1) infinite; }
.logo small { font: 700 11px/1 var(--mono); letter-spacing: .1em; text-transform: uppercase; color: var(--ink-3); margin-left: 12px; display: none; }
.lang { display: inline-flex; border: 1px solid var(--line); border-radius: 8px; overflow: hidden; }
.lang button { border: 0; background: transparent; cursor: pointer; font: 800 12px/1 var(--mono); letter-spacing: .06em; padding: 9px 11px; color: var(--ink-3); }
.lang button[aria-pressed="true"] { background: var(--cyan); color: var(--on-cyan); }
.bar .btn { display: none; }
.tabs { display: grid; grid-template-columns: repeat(3, 1fr); }
.tabs a { text-align: center; text-decoration: none; padding: 11px 4px 10px; font: 700 14px/1.2 var(--mono); color: var(--ink-3); border-bottom: 3px solid transparent; margin-bottom: -1px; transition: color .15s; }
.tabs a:hover { color: var(--ink); }
.tabs a[aria-current="true"] { color: var(--ink); border-bottom-color: var(--cyan); }

/* hero */
.hero { padding: 32px 0 20px; }
.hero-grid { display: grid; gap: 28px; align-items: center; }
.prompt { font: 700 12px/1.4 var(--mono); color: var(--ink-3); display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
.prompt b { color: var(--cyan); }
.prompt em { font-style: normal; border: 1px solid var(--line); border-radius: 6px; padding: 2px 8px; color: var(--ink-2); }
.hero h1 { margin: 14px 0 16px; }
.hero h1 span { display: block; }
.cta-row { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 24px; }
.ticks { margin-top: 16px; display: flex; flex-wrap: wrap; gap: 6px 16px; font: 500 12px/1.4 var(--mono); color: var(--ink-2); }
.ticks span::before { content: "✓ "; color: var(--good); font-weight: 800; }

.term { background: var(--card); border: 1px solid var(--line); border-radius: 12px; overflow: hidden; min-width: 0; }
.term-bar { display: flex; align-items: center; gap: 6px; padding: 10px 14px; border-bottom: 1px solid var(--line); font: 600 11px/1 var(--mono); color: var(--ink-3); }
.term-bar i { width: 9px; height: 9px; border-radius: 2px; background: var(--line); }
.term-bar span { margin-left: auto; letter-spacing: .06em; text-transform: uppercase; }
.term-read { display: grid; grid-template-columns: 1.3fr 1fr 1fr; border-bottom: 1px solid var(--line); }
.term-read > div { padding: 14px; border-right: 1px solid var(--line); min-width: 0; }
.term-read > div:last-child { border-right: 0; }
.big { font: 800 clamp(44px, 12vw, 64px)/1 var(--mono); letter-spacing: -.04em; margin-top: 6px; font-variant-numeric: tabular-nums; }
.mid { font: 800 clamp(24px, 6vw, 32px)/1.2 var(--mono); margin-top: 10px; font-variant-numeric: tabular-nums; }
.term-read .big { color: var(--cyan); }
.term-read .acc { color: var(--good); }
.tt { padding: 18px 14px 20px; font: 500 clamp(16px, 4.4vw, 20px)/1.85 var(--mono); color: var(--ink-3); min-height: 168px; overflow-wrap: anywhere; }
.tt .ok { color: var(--good); }
.tt .no { color: var(--bad); background: color-mix(in srgb, var(--bad) 22%, transparent); border-radius: 3px; }
.tt .at { position: relative; }
.tt .at::before { content: ""; position: absolute; left: -1px; top: .28em; bottom: .28em; width: 2px; background: var(--cyan); animation: blink 1.06s steps(1) infinite; }
.tt.done .at { display: none; }
.term-foot { padding: 10px 14px; border-top: 1px solid var(--line); font: 600 11px/1.3 var(--mono); color: var(--ink-3); display: flex; justify-content: space-between; gap: 8px; }

/* sections */
.sec { padding: 52px 0 8px; }
.sec-head { display: grid; gap: 10px; margin-bottom: 22px; }
.sec-head .label { color: var(--cyan); }
.bento { display: grid; gap: 10px; grid-template-columns: 1fr 1fr; }
.tile { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 14px; min-width: 0; display: flex; flex-direction: column; gap: 6px; }
.tile.on { border-color: var(--cyan); }
.tile h3 { color: var(--ink); }
.tile p { color: var(--ink-2); font-size: 14px; line-height: 1.5; }
.s2 { grid-column: span 2; }
.tile .label { margin-bottom: 2px; }
.startline { font: 700 15px/1.4 var(--mono); color: var(--ink); }
.fake-btn { margin-top: 10px; background: var(--cyan); color: var(--on-cyan); border-radius: 12px; height: 52px; display: grid; place-items: center; font: 800 15px/1 var(--mono); }
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 4px; }
.chip { border: 1px solid var(--line); background: var(--surface); border-radius: 8px; padding: 9px 14px; font: 700 14px/1 var(--mono); color: var(--ink); }
.chip.on { background: var(--cyan); border-color: var(--cyan); color: var(--on-cyan); }
.bar-track { height: 10px; border-radius: 5px; background: var(--surface); overflow: hidden; margin-top: 8px; }
.bar-track i { display: block; height: 100%; width: 62%; background: var(--cyan); }
.lbl-warn { color: var(--warn); }
.spark { width: 100%; height: 76px; margin-top: 8px; overflow: visible; }
.delta { font: 800 18px/1 var(--mono); color: var(--good); margin-left: 8px; }
.unit { font: 700 12px/1 var(--mono); color: var(--ink-3); margin-left: 6px; }
.heat { display: grid; grid-template-rows: repeat(7, 1fr); grid-auto-flow: column; grid-auto-columns: 1fr; gap: 4px; margin-top: 8px; }
.heat i { aspect-ratio: 1.25; border-radius: 3px; background: var(--surface); }
.heat i.l1 { background: var(--h1); } .heat i.l2 { background: var(--h2); } .heat i.l3 { background: var(--cyan); }
.heat i.x { background: transparent; border: 1px solid var(--line); }
.hist { width: 100%; border-collapse: collapse; font: 500 13px/1.3 var(--mono); margin-top: 6px; }
.hist td { padding: 9px 0; border-top: 1px solid var(--line); color: var(--ink-2); white-space: nowrap; }
.hist tr:first-child td { border-top: 0; }
.hist td:nth-child(3) { color: var(--cyan); font-weight: 800; text-align: right; }
.hist td:last-child { color: var(--good); font-weight: 700; text-align: right; }
.hist td:nth-child(2) { color: var(--ink-3); }
.hist td:nth-child(3) small { color: var(--ink-3); font-weight: 600; }
.badges { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; margin-top: 6px; }
.badge { aspect-ratio: 1; border: 1px solid var(--line); border-radius: 12px; display: grid; place-items: center; align-content: center; gap: 6px; padding: 6px; text-align: center; font: 700 11px/1.25 var(--mono); color: var(--ink-3); }
.badge b { width: 30px; height: 30px; border-radius: 8px; background: var(--surface); display: grid; place-items: center; font: 800 14px/1 var(--mono); color: var(--ink-3); }
.badge.on { border-color: var(--cyan); color: var(--ink); }
.badge.on b { background: var(--cyan); color: var(--on-cyan); }
.list { display: grid; gap: 6px; margin-top: 6px; font-size: 14px; color: var(--ink-2); }
.list li::before { content: "> "; font: 800 14px var(--mono); color: var(--cyan); }
.toggles { display: grid; gap: 0; margin-top: 4px; font-size: 14px; color: var(--ink-2); }
.toggles div { display: flex; justify-content: space-between; align-items: center; gap: 12px; padding: 9px 0; border-top: 1px solid var(--line); }
.toggles div:first-child { border-top: 0; }
.sw { width: 40px; height: 22px; border-radius: 6px; border: 1px solid var(--line); background: var(--surface); position: relative; flex: none; }
.sw::after { content: ""; position: absolute; top: 3px; left: 3px; width: 14px; height: 14px; border-radius: 3px; background: var(--ink-3); }
.sw.on { background: var(--cyan); border-color: var(--cyan); }
.sw.on::after { left: 21px; background: var(--on-cyan); }
.bad { color: var(--bad); }

/* screens: horizontal strip */
.shots { display: flex; gap: 12px; overflow-x: auto; padding: 2px 16px 16px; margin: 0 -16px; scroll-snap-type: x mandatory; -webkit-overflow-scrolling: touch; }
.shots figure { margin: 0; flex: 0 0 min(232px, 62vw); scroll-snap-align: start; }
.shots img { width: 100%; height: auto; border-radius: 12px; border: 1px solid var(--line); }
.shots figcaption { margin-top: 10px; font: 700 11px/1.3 var(--mono); letter-spacing: .1em; text-transform: uppercase; color: var(--ink-3); }

/* compare */
.compare { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 4px 14px; }
.row { display: grid; grid-template-columns: 1.6fr .8fr .9fr; gap: 8px; align-items: center; padding: 12px 0; border-bottom: 1px solid var(--line); font-size: 14px; }
.row:last-child { border-bottom: 0; }
.row.head { font: 700 11px/1.3 var(--mono); letter-spacing: .1em; text-transform: uppercase; color: var(--ink-3); }
.row.head span:last-child { color: var(--cyan); }
.row span:not(:first-child) { text-align: center; font: 700 13px/1.2 var(--mono); }
.yes { color: var(--good); } .no { color: var(--ink-3); }
.plans { display: grid; gap: 10px; margin-top: 10px; }
.plan { border: 1px solid var(--line); border-radius: 12px; padding: 12px 14px; font-size: 14px; color: var(--ink-2); background: var(--card); }
.plan b { display: block; color: var(--ink); font: 800 15px/1.4 var(--mono); }

/* stats strip */
.nums { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-top: 14px; }
.nums .tile { align-items: flex-start; }
.nums strong { font: 800 clamp(30px, 8vw, 44px)/1 var(--mono); color: var(--cyan); letter-spacing: -.04em; }
.nums span { font: 600 11px/1.3 var(--mono); color: var(--ink-3); letter-spacing: .04em; text-transform: uppercase; }
.lnk { color: var(--cyan); font-weight: 700; }

/* faq */
.faq details { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 14px; margin-bottom: 8px; }
.faq details[open] { border-color: var(--cyan); }
.faq summary { cursor: pointer; font: 700 15px/1.45 var(--mono); list-style: none; display: flex; gap: 10px; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::before { content: ">"; color: var(--cyan); font-weight: 800; }
.faq details[open] summary::before { content: "v"; }
.faq p { color: var(--ink-2); margin: 10px 0 0 20px; font-size: 15px; }

.cta-end { margin-top: 56px; }
.cta-end .tile { padding: 22px 16px; gap: 14px; }
.cta-end h2 { font-size: clamp(20px, 5.4vw, 30px); }
.cta-end .cmd { font: 700 13px/1.4 var(--mono); color: var(--ink-3); }
.cta-end .cmd b { color: var(--cyan); }

footer { padding: 40px 0 36px; color: var(--ink-2); font-size: 14px; }
.foot { display: grid; gap: 18px; border-top: 1px solid var(--line); padding-top: 28px; }
.foot strong { font-family: var(--mono); color: var(--ink); }
.foot nav { display: flex; flex-wrap: wrap; gap: 8px 20px; }
.foot a { text-decoration: none; font: 600 13px/1.4 var(--mono); }
.foot a:hover { color: var(--cyan); }
.foot code { font-family: var(--mono); font-size: 12px; color: var(--ink-3); }

/* reveal */
.reveal { opacity: 0; transform: translateY(10px); transition: opacity .45s, transform .45s; }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
  .cur, .logo i, .tt .at::before { animation: none; }
}

/* legal / 404 */
.legal { max-width: 760px; margin: 0 auto; padding: 36px 16px 24px; }
.legal .label { color: var(--cyan); }
.legal h1 { font-size: clamp(26px, 7vw, 40px); margin: 12px 0 8px; }
.legal h2 { font-size: 18px; margin: 30px 0 6px; }
.legal p, .legal li { color: var(--ink-2); margin: 8px 0; }
.legal ul { list-style: disc; padding-left: 22px; }
.legal b { color: var(--ink); }
.legal a { color: var(--cyan); font-weight: 600; }
.legal .meta { font: 500 12px/1.5 var(--mono); color: var(--ink-3); }
.legal code { font-family: var(--mono); background: var(--surface); border: 1px solid var(--line); padding: 1px 6px; border-radius: 6px; font-size: .88em; }
html[lang="en"] [lang="vi"]:not(html), html[lang="vi"] [lang="en"]:not(html) { display: none; }
.notfound { min-height: 60vh; display: grid; place-items: center; text-align: center; padding: 40px 16px; }
.notfound h1 { font-size: clamp(72px, 26vw, 160px); color: var(--cyan); }
.notfound .btn { color: var(--on-cyan); }

@media (min-width: 640px) {
  .wrap { padding: 0 24px; }
  .shots { margin: 0 -24px; padding: 2px 24px 16px; }
  .bar .btn { display: inline-flex; }
  .logo small { display: inline; }
  .plans { grid-template-columns: repeat(3, 1fr); }
  .tile { padding: 16px; }
  .row { font-size: 15px; }
}
@media (min-width: 900px) {
  .bento { grid-template-columns: repeat(6, 1fr); gap: 12px; }
  .s2 { grid-column: span 2; } .s3 { grid-column: span 3; } .s4 { grid-column: span 4; } .s6 { grid-column: span 6; }
  .hero { padding: 56px 0 28px; }
  .hero-grid { grid-template-columns: 1.02fr .98fr; gap: 40px; }
  .tabs { max-width: 520px; }
  .shots { margin: 0; padding: 2px 0 16px; }
  .shots figure { flex: 1 1 0; }
  .foot { grid-template-columns: 1fr auto; align-items: end; }
  .sec { padding-top: 72px; }
}
@media (max-width: 899px) {
  .s3, .s4, .s6 { grid-column: span 2; }
}
.quad { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
@media (min-width: 900px) { .m { grid-column: span 2; } .quad { gap: 12px; } }
.tile.plain { padding: 0; border: 0; background: transparent; }