/* quiet.css — "Quiet Mac Landing" design system.
   One centered column, near-monochrome, pill controls, one accent per product.
   All classes are prefixed `q-` so it can live beside a legacy stylesheet during migration.
   Set the product accent by overriding --q-accent (and --q-accent-ink for text on it). */

:root {
  --q-bg: #fafafa;
  --q-surface: rgba(18, 18, 18, 0.04);
  --q-surface-2: rgba(18, 18, 18, 0.07);
  --q-ink: #121212;
  --q-ink-2: #55555c;          /* 7.0:1 on --q-bg — secondary text stays readable */
  --q-ink-3: #6b6b73;          /* 4.9:1 — smallest allowed (notes, meta) */
  --q-hairline: rgba(18, 18, 18, 0.1);
  --q-accent: #0a84ff;
  --q-accent-ink: #ffffff;
  --q-accent-text: #0066cc;    /* accent used as text on --q-bg (≥4.5:1) */
  --q-btn: #121212;
  --q-btn-ink: #ffffff;
  --q-nav-bg: rgba(250, 250, 250, 0.78);
  --q-shadow-btn: 0 0.6px 0.6px -1.25px rgba(0,0,0,.12), 0 2.3px 2.3px -2.5px rgba(0,0,0,.1), 0 10px 10px -3.75px rgba(0,0,0,.04);
  --q-shadow-media: 0 0.8px 2.4px rgba(0,0,0,.01), 0 2.4px 7.2px rgba(0,0,0,.02), 0 6.4px 19px rgba(0,0,0,.05), 0 20px 60px rgba(0,0,0,.16);
  --q-r-pill: 999px;
  --q-r-card: 40px;
  --q-r-panel: 56px;
  --q-col: 600px;              /* reading column */
  --q-wide: 880px;             /* media + panels */
  --q-gap-section: clamp(96px, 14vw, 180px);
  --q-ease: cubic-bezier(0.22, 1, 0.36, 1);
  --q-font: "Inter Display", Inter, -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, sans-serif;
  --q-font-round: ui-rounded, "SF Pro Rounded", "Nunito", var(--q-font);
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --q-bg: #0e0e10;
    --q-surface: rgba(255, 255, 255, 0.06);
    --q-surface-2: rgba(255, 255, 255, 0.1);
    --q-ink: #f2f2f4;
    --q-ink-2: #b4b4bb;
    --q-ink-3: #9a9aa2;
    --q-hairline: rgba(255, 255, 255, 0.12);
    --q-accent-text: #4da3ff;
    --q-btn: #f2f2f4;
    --q-btn-ink: #121212;
    --q-nav-bg: rgba(14, 14, 16, 0.78);
    --q-shadow-media: 0 0 0 1px rgba(255,255,255,.08), 0 30px 80px -20px rgba(0,0,0,.8);
  }
}
:root[data-theme="dark"] {
  --q-bg: #0e0e10; --q-surface: rgba(255,255,255,.06); --q-surface-2: rgba(255,255,255,.1);
  --q-ink: #f2f2f4; --q-ink-2: #b4b4bb; --q-ink-3: #9a9aa2; --q-hairline: rgba(255,255,255,.12);
  --q-accent-text: #4da3ff; --q-btn: #f2f2f4; --q-btn-ink: #121212; --q-nav-bg: rgba(14,14,16,.78);
  --q-shadow-media: 0 0 0 1px rgba(255,255,255,.08), 0 30px 80px -20px rgba(0,0,0,.8);
}

/* ---------- Base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; scroll-padding-top: 72px; }
body {
  margin: 0; background: var(--q-bg); color: var(--q-ink);
  font: 400 17px/1.6 var(--q-font);   /* 1.6 leaves room for Vietnamese stacked diacritics */
  -webkit-font-smoothing: antialiased; overflow-x: hidden;
}
img, video { max-width: 100%; height: auto; display: block; }
[hidden] { display: none !important; } /* components set display:grid/flex; [hidden] must still win */
a { color: inherit; }
:focus-visible { outline: 2px solid var(--q-accent); outline-offset: 3px; border-radius: 10px; }
.q-sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

.q-col { width: min(var(--q-col), 100% - 32px); margin-inline: auto; }
.q-wide { width: min(var(--q-wide), 100% - 32px); margin-inline: auto; }
.q-section { margin-block: var(--q-gap-section); }
.q-center { text-align: center; }

/* ---------- Type ---------- */
.q-h1, .q-h2, .q-h3 { margin: 0; color: var(--q-ink); text-wrap: balance; }
.q-h1 { font: 500 clamp(22px, 3vw, 26px)/1.45 var(--q-font); }               /* tagline-as-h1: quiet, not shouty */
.q-h2 { font: 700 clamp(30px, 5vw, 44px)/1.15 var(--q-font-round); letter-spacing: -0.02em; }
.q-h3 { font: 600 19px/1.4 var(--q-font); }
.q-lead { font-size: 19px; line-height: 1.65; color: var(--q-ink-2); margin: 16px 0 0; text-wrap: pretty; }
.q-body { color: var(--q-ink-2); margin: 0 0 16px; text-wrap: pretty; }
.q-body strong, .q-lead strong { color: var(--q-ink); font-weight: 650; }
.q-note { font-size: 14px; line-height: 1.5; color: var(--q-ink-3); margin: 0; }
.q-note b { color: var(--q-ink); font-weight: 500; }

/* ---------- Nav (appears once the hero CTA scrolls away) ---------- */
.q-nav {
  position: fixed; inset: 0 0 auto; z-index: 50; height: 56px;
  background: var(--q-nav-bg); backdrop-filter: saturate(180%) blur(20px); -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--q-hairline);
  transition: transform .35s var(--q-ease);
}
/* Only pages with a hero (quiet.js sets .q-has-hero) hide the nav until the hero CTA scrolls away; no-JS and plain pages always show it. */
.q-has-hero .q-nav:not(.is-shown):not(:focus-within) { transform: translateY(-100%); }
.q-nav-inner { width: min(var(--q-wide), 100% - 32px); height: 100%; margin-inline: auto; display: flex; align-items: center; gap: 20px; }
.q-nav-brand { display: flex; align-items: center; gap: 8px; font-weight: 650; text-decoration: none; }
.q-nav-links { display: flex; gap: 20px; list-style: none; margin: 0 auto 0 12px; padding: 0; font-size: 14px; }
.q-nav-links a { color: var(--q-ink-2); text-decoration: none; }
.q-nav-links a:hover { color: var(--q-ink); }
.q-nav-lang { font-size: 14px; color: var(--q-ink-2); text-decoration: none; }
.q-nav-lang:hover { color: var(--q-ink); }
@media (max-width: 640px) { .q-nav-links { display: none; } .q-nav-links + * { margin-left: auto; } }

/* ---------- Buttons ---------- */
.q-cta { display: flex; flex-wrap: wrap; justify-content: center; gap: 16px; margin: 36px 0 16px; }
.q-btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  min-height: 52px; min-width: 200px; padding: 0 28px; border: 0; border-radius: var(--q-r-pill);
  font: 500 17px/1 var(--q-font); text-decoration: none; cursor: pointer;
  background: var(--q-surface); color: var(--q-ink);
  transition: transform .2s var(--q-ease), background-color .2s, box-shadow .2s;
}
.q-btn:hover { background: var(--q-surface-2); }
.q-btn:active { transform: scale(.97); }
.q-btn-primary { background: var(--q-btn); color: var(--q-btn-ink); box-shadow: var(--q-shadow-btn); }
.q-btn-primary:hover { background: var(--q-btn); transform: translateY(-1px); }
.q-btn-accent { background: var(--q-accent); color: var(--q-accent-ink); }
.q-btn-accent:hover { background: var(--q-accent); filter: brightness(1.06); }
.q-btn-sm { min-height: 40px; min-width: 0; padding: 0 16px; font-size: 14px; }
.q-btn-block { width: 100%; }
.q-btn svg { width: 18px; height: 18px; flex: none; }
.q-link { color: var(--q-ink); font-weight: 500; text-underline-offset: 4px; text-decoration-color: var(--q-hairline); }
.q-link:hover { text-decoration-color: currentColor; }

/* ---------- Hero ---------- */
.q-hero { padding-top: clamp(64px, 10vw, 112px); text-align: center; }
.q-logo { display: inline-flex; align-items: center; gap: 14px; margin-bottom: 28px; font: 800 clamp(48px, 9vw, 76px)/1 var(--q-font-round); letter-spacing: -0.03em; }
.q-logo img { width: 1.15em; height: 1.15em; border-radius: 22%; box-shadow: var(--q-shadow-btn); }
.q-media {
  margin-top: clamp(48px, 8vw, 80px); border-radius: 28px; overflow: hidden;
  box-shadow: var(--q-shadow-media); background: var(--q-surface);
  transform: perspective(1600px) rotateX(4deg); transition: transform .8s var(--q-ease);
}
.q-media:hover { transform: none; }

/* ---------- Inline chips (feature list written as one sentence) ---------- */
.q-sentence { font-size: clamp(19px, 2.4vw, 22px); line-height: 2.1; color: var(--q-ink-2); text-align: center; margin: 0; text-wrap: balance; }
/* display:inline (not inline-flex) so a following comma never wraps onto its own line */
.q-chip {
  display: inline; padding: 6px 14px; margin: 0 1px 0 4px;
  border-radius: var(--q-r-pill); background: var(--q-surface); color: var(--q-ink); font-weight: 500;
  white-space: nowrap; -webkit-box-decoration-break: clone; box-decoration-break: clone;
}
.q-chip svg { width: 1em; height: 1em; vertical-align: -0.15em; margin-right: 6px; }
@media (max-width: 520px) { .q-sentence { line-height: 2.3; } .q-chip { padding: 5px 11px; } }

/* ---------- Feature pairs ---------- */
.q-features { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 22px 40px; list-style: none; padding: 0; margin: 0 0 36px; }
.q-features li { display: flex; align-items: center; gap: 12px; font-weight: 600; font-size: 17px; }
.q-features svg { width: 22px; height: 22px; flex: none; color: var(--q-ink); }
.q-features sup { color: var(--q-accent-text); font-size: 11px; font-weight: 700; }
@media (max-width: 520px) { .q-features { grid-template-columns: 1fr; } }

/* ---------- Cards / panels ---------- */
.q-card { position: relative; padding: 32px; border-radius: var(--q-r-card); background: var(--q-surface-2); }
.q-panel { padding: clamp(40px, 7vw, 72px) clamp(24px, 6vw, 80px); border-radius: var(--q-r-panel); background: var(--q-surface-2); text-align: center; }
.q-sticker {
  position: absolute; top: -14px; right: 28px; padding: 4px 10px; border-radius: 8px;
  background: var(--q-btn); color: var(--q-btn-ink); font: 800 11px/1.2 var(--q-font); text-transform: uppercase; letter-spacing: .04em;
  transform: rotate(4deg);
}
.q-price { display: flex; align-items: baseline; gap: 10px; margin: 16px 0 4px; font: 800 44px/1 var(--q-font); }
.q-price s { font-size: 30px; color: var(--q-ink-3); font-weight: 600; }
.q-tiers { display: grid; grid-template-columns: repeat(auto-fit, minmax(120px, 1fr)); gap: 12px; margin-top: 20px; }
.q-tier { padding: 18px; border-radius: 24px; background: var(--q-surface); text-align: center; }
.q-tier b { display: block; font-size: 20px; }

/* ---------- Testimonials marquee ---------- */
.q-marquee { overflow: hidden; mask-image: linear-gradient(90deg, transparent, #000 10%, #000 90%, transparent); }
.q-marquee-track { display: flex; gap: 16px; width: max-content; padding: 4px 0; list-style: none; margin: 0; animation: q-scroll 60s linear infinite; }
.q-marquee:hover .q-marquee-track, .q-marquee:focus-within .q-marquee-track { animation-play-state: paused; }
.q-quote { width: 300px; padding: 22px 24px; border-radius: 28px; background: var(--q-surface); font-size: 15px; line-height: 1.55; }
.q-quote cite { display: block; margin-top: 10px; font-style: normal; color: var(--q-ink-3); font-size: 13px; }
@keyframes q-scroll { to { transform: translateX(calc(-50% - 8px)); } }

/* ---------- FAQ ---------- */
.q-faq details { border-bottom: 1px solid var(--q-hairline); padding: 18px 0; }
.q-faq summary { cursor: pointer; font-weight: 600; list-style: none; display: flex; justify-content: space-between; gap: 16px; }
.q-faq summary::after { content: "+"; color: var(--q-ink-3); transition: transform .25s var(--q-ease); }
.q-faq details[open] summary::after { transform: rotate(45deg); }
.q-faq p { margin: 12px 0 0; color: var(--q-ink-2); }

/* ---------- Plain pages (terms, order, license): nav always visible ---------- */
.q-page { padding: 120px 0 64px; min-height: 70vh; }
.q-prose h2 { margin: 40px 0 8px; font: 650 21px/1.35 var(--q-font); }
.q-prose p, .q-prose li { color: var(--q-ink-2); }
.q-prose a { color: var(--q-accent-text); }

/* ---------- Footer ---------- */
.q-footer { padding: 64px 16px 48px; text-align: center; }
.q-footer ul { display: flex; flex-wrap: wrap; justify-content: center; gap: 12px 32px; list-style: none; padding: 0; margin: 0 0 20px; font-size: 14px; }
.q-footer a { color: var(--q-ink-2); text-underline-offset: 4px; }
.q-footer-apps [aria-current] { color: var(--q-ink); font-weight: 600; }

/* ---------- Motion ---------- */
.q-reveal { opacity: 0; transform: translateY(16px); transition: opacity .7s var(--q-ease), transform .7s var(--q-ease); transition-delay: calc(var(--q-i, 0) * 60ms); }
.q-reveal.is-visible { opacity: 1; transform: none; }
.no-js .q-reveal { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .q-reveal { opacity: 1; transform: none; transition: none; }
  .q-marquee-track { animation: none; flex-wrap: wrap; width: auto; justify-content: center; }
  .q-marquee { mask-image: none; }
  .q-marquee-track > [aria-hidden="true"] { display: none; }
  .q-media { transform: none; }
}