/* PolySync company site — shared design system.
   Fill-based (no borders; surfaces differ by fill + shadow), brand accent #215aa5,
   system fonts (zero external requests). LIGHT IS THE DEFAULT; dark is opt-in via the
   nav toggle (sets <html data-theme="dark">). One stylesheet for every page.
   Decorative multi-hue gradients (accent2/accent3) add richness but are never used for
   text or brand — the brand colour stays #215aa5. */

:root {
  color-scheme: light;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial,
    "Apple Color Emoji", "Segoe UI Emoji", sans-serif;
  --font-display: var(--font-sans);

  --accent: #215aa5;
  --accent-600: #1b4a88;
  --accent-ink: #ffffff;
  --accent2: #7c5cff;   /* decorative only */
  --accent3: #12b3a6;   /* decorative only */

  --bg: #f6f7f9;
  --surface: #ffffff;
  --surface-2: #eef1f5;
  --text: #15181d;
  --muted: #5b626d;
  --faint: #878e99;
  --hairline: rgba(16, 24, 40, 0.08);

  --shadow-sm: 0 1px 2px rgba(16, 24, 40, 0.06), 0 1px 3px rgba(16, 24, 40, 0.08);
  --shadow-md: 0 6px 18px rgba(16, 24, 40, 0.08), 0 2px 6px rgba(16, 24, 40, 0.05);
  --shadow-lg: 0 20px 48px rgba(16, 24, 40, 0.14), 0 4px 12px rgba(16, 24, 40, 0.06);
  --shadow-xl: 0 40px 90px rgba(16, 24, 40, 0.18), 0 10px 30px rgba(16, 24, 40, 0.10);

  --radius: 14px;
  --radius-lg: 22px;
  --radius-xl: 30px;
  --radius-pill: 999px;
  --max: 1160px;
  --gutter: 20px;
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --accent: #5a93e6;
  --accent-600: #4a82d6;
  --accent-ink: #0b1220;
  --accent2: #9f88ff;
  --accent3: #3ad0c2;
  --bg: #0e1116;
  --surface: #161b22;
  --surface-2: #1d232c;
  --text: #e8ebf0;
  --muted: #a3abb7;
  --faint: #7a828e;
  --hairline: rgba(255, 255, 255, 0.09);
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 6px 18px rgba(0, 0, 0, 0.45);
  --shadow-lg: 0 20px 48px rgba(0, 0, 0, 0.55);
  --shadow-xl: 0 40px 90px rgba(0, 0, 0, 0.6);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  line-height: 1.1;
  letter-spacing: -0.022em;
  margin: 0 0 0.5em;
  font-weight: 800;
}
h1 { font-size: clamp(2.3rem, 6.4vw, 4rem); }
h2 { font-size: clamp(1.7rem, 4vw, 2.6rem); }
h3 { font-size: 1.24rem; font-weight: 700; }
p { margin: 0 0 1rem; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
img, svg { max-width: 100%; }
img { display: block; }

:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; border-radius: 6px; }

.container { max-width: var(--max); margin: 0 auto; padding: 0 var(--gutter); }
.container--narrow { max-width: 820px; }
.section { padding: clamp(3.2rem, 8vw, 6.5rem) 0; }
.section--tight { padding: clamp(2rem, 5vw, 3.5rem) 0; }
.section--alt { background: var(--surface); }
.eyebrow {
  font-weight: 700; letter-spacing: 0.09em; text-transform: uppercase;
  font-size: 0.78rem; color: var(--accent); margin: 0 0 0.7rem;
}
.lead { font-size: clamp(1.05rem, 2.4vw, 1.32rem); color: var(--muted); max-width: 62ch; }
.center { text-align: center; }
.center .lead { margin-left: auto; margin-right: auto; }
.center .btn-row { justify-content: center; }
.muted { color: var(--muted); }
.small { font-size: 0.9rem; }
.section-head { max-width: 62ch; margin: 0 auto clamp(2rem, 5vw, 3.2rem); }
.center.section-head { text-align: center; }

/* ---------- top nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--bg) 80%, transparent);
  backdrop-filter: saturate(160%) blur(14px);
  -webkit-backdrop-filter: saturate(160%) blur(14px);
  box-shadow: 0 1px 0 var(--hairline);
}
.nav__inner { display: flex; align-items: center; gap: 0.5rem; height: 66px; }
.brand { display: flex; align-items: center; gap: 0.6rem; font-weight: 700; color: var(--text); margin-right: auto; }
.brand:hover { text-decoration: none; }
.brand__logo { height: 26px; width: auto; display: block; }
.footer .brand__logo { height: 28px; }
.brand__logo--dark { display: none; }
:root[data-theme="dark"] .brand__logo--light { display: none; }
:root[data-theme="dark"] .brand__logo--dark { display: block; }

.nav__links { display: flex; align-items: center; gap: 0.25rem; list-style: none; margin: 0; padding: 0; }
.nav__links a {
  color: var(--text); padding: 0.45rem 0.85rem; border-radius: var(--radius-pill);
  font-size: 0.95rem; font-weight: 500; transition: background 0.15s;
}
.nav__links a:hover { text-decoration: none; background: var(--surface-2); }
.nav__links a[aria-current="page"] { background: var(--surface-2); color: var(--accent); }
.nav__toggle, .nav__check { display: none; }

.theme-toggle {
  display: inline-grid; place-items: center; width: 40px; height: 40px; flex: none;
  border: 0; cursor: pointer; border-radius: var(--radius-pill);
  background: var(--surface-2); color: var(--text); transition: background 0.15s, transform 0.12s;
}
.theme-toggle:hover { background: color-mix(in srgb, var(--surface-2) 70%, var(--text) 10%); }
.theme-toggle:active { transform: scale(0.94); }
.theme-toggle svg { width: 19px; height: 19px; }
.theme-toggle .ico-dark { display: none; }
:root[data-theme="dark"] .theme-toggle .ico-light { display: none; }
:root[data-theme="dark"] .theme-toggle .ico-dark { display: block; }

@media (max-width: 820px) {
  .nav__links {
    position: absolute; top: 66px; left: 0; right: 0;
    flex-direction: column; align-items: stretch; gap: 0.15rem;
    background: var(--surface); box-shadow: var(--shadow-md);
    padding: 0.6rem var(--gutter) 1rem; display: none;
  }
  .nav__links a { padding: 0.8rem 0.9rem; border-radius: var(--radius); }
  .nav__check:checked ~ .nav__links { display: flex; }
  .nav__toggle {
    display: inline-grid; place-items: center; order: 3;
    width: 42px; height: 42px; border-radius: var(--radius-pill); cursor: pointer;
    background: var(--surface-2); color: var(--text);
  }
}

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 0.5rem; justify-content: center;
  font-weight: 600; font-size: 1rem; padding: 0.85rem 1.5rem; border: 0; cursor: pointer;
  border-radius: var(--radius-pill); text-decoration: none;
  transition: transform 0.12s, background 0.15s, box-shadow 0.15s;
}
.btn:hover { text-decoration: none; }
.btn:active { transform: translateY(1px); }
.btn--primary { background: var(--accent); color: var(--accent-ink); box-shadow: var(--shadow-sm); }
.btn--primary:hover { background: var(--accent-600); box-shadow: var(--shadow-md); }
.btn--ghost { background: var(--surface-2); color: var(--text); }
.btn--ghost:hover { background: color-mix(in srgb, var(--surface-2) 70%, var(--text) 8%); }
.btn--lg { padding: 1rem 1.8rem; font-size: 1.05rem; }
.btn svg { width: 18px; height: 18px; }
.btn-row { display: flex; flex-wrap: wrap; gap: 0.75rem; }

.pill {
  display: inline-flex; align-items: center; gap: 0.4rem;
  background: var(--surface-2); color: var(--muted);
  padding: 0.32rem 0.85rem; border-radius: var(--radius-pill);
  font-size: 0.8rem; font-weight: 600;
}
.pill--accent { background: color-mix(in srgb, var(--accent) 16%, transparent); color: var(--accent); }
.pill--live { background: color-mix(in srgb, var(--accent3) 20%, transparent); color: var(--accent3); }
.pill--dot::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: currentColor; }

/* ---------- hero ---------- */
.hero { padding: clamp(3rem, 7vw, 5.5rem) 0 clamp(2.5rem, 6vw, 4rem); position: relative; }
.hero h1 { max-width: 15ch; }
.hero .lead { margin-top: 1.1rem; }
.hero .btn-row { margin-top: 2rem; }

/* aurora glow backdrop for feature heroes */
.aurora { position: relative; isolation: isolate; }
.aurora::before {
  content: ""; position: absolute; inset: -20% -10% auto -10%; height: 680px; z-index: -1;
  background:
    radial-gradient(42% 55% at 18% 20%, color-mix(in srgb, var(--accent) 34%, transparent), transparent 70%),
    radial-gradient(40% 50% at 82% 12%, color-mix(in srgb, var(--accent2) 30%, transparent), transparent 70%),
    radial-gradient(45% 55% at 60% 48%, color-mix(in srgb, var(--accent3) 24%, transparent), transparent 72%);
  filter: blur(14px); opacity: 0.9; pointer-events: none;
}
:root[data-theme="dark"] .aurora::before { opacity: 0.55; }

.hero-grid {
  display: grid; grid-template-columns: 1.05fr 1fr; gap: clamp(2rem, 5vw, 3.5rem);
  align-items: center;
}
@media (max-width: 920px) { .hero-grid { grid-template-columns: 1fr; } .hero-grid__media { order: 2; } }

/* ---------- device mockup ---------- */
.device {
  width: 100%; border-radius: 26px; background: #0c1017; padding: 14px;
  box-shadow: var(--shadow-xl); transform: perspective(1600px) rotateY(-8deg) rotateX(3deg);
  transition: transform 0.5s ease;
}
.device:hover { transform: perspective(1600px) rotateY(-3deg) rotateX(1deg); }
.device svg { display: block; width: 100%; height: auto; border-radius: 14px; }
.device--flat { transform: none; }
.device--flat:hover { transform: none; }

/* ---------- surfaces / cards ---------- */
.card {
  background: var(--surface); border-radius: var(--radius-lg);
  padding: clamp(1.4rem, 3vw, 2rem); box-shadow: var(--shadow-md);
  transition: transform 0.18s, box-shadow 0.18s;
}
.card--hover:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.card h3 { margin-top: 0; }
.grid { display: grid; gap: 1.2rem; }
.grid--4 { grid-template-columns: repeat(4, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--2 { grid-template-columns: repeat(2, 1fr); }
@media (max-width: 980px) { .grid--4 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 860px) { .grid--3, .grid--2 { grid-template-columns: 1fr; } }
@media (max-width: 560px) { .grid--4 { grid-template-columns: 1fr; } }

.feature-ico {
  width: 48px; height: 48px; border-radius: 13px; display: grid; place-items: center;
  background: color-mix(in srgb, var(--accent) 15%, transparent); color: var(--accent);
  margin-bottom: 1rem;
}
.feature-ico svg { width: 24px; height: 24px; }
.feature-ico--2 { background: color-mix(in srgb, var(--accent2) 16%, transparent); color: var(--accent2); }
.feature-ico--3 { background: color-mix(in srgb, var(--accent3) 18%, transparent); color: var(--accent3); }

/* ---------- feature showcase rows (alternating) ---------- */
.row {
  display: grid; grid-template-columns: 1fr 1fr; gap: clamp(1.5rem, 5vw, 4rem);
  align-items: center; margin: clamp(2.5rem, 6vw, 4.5rem) 0;
}
.row:nth-child(even) .row__media { order: -1; }
.row__media {
  border-radius: var(--radius-lg); aspect-ratio: 4 / 3; overflow: hidden;
  box-shadow: var(--shadow-md); display: grid; place-items: center;
  background:
    linear-gradient(140deg, color-mix(in srgb, var(--accent) 10%, var(--surface)),
    color-mix(in srgb, var(--accent2) 8%, var(--surface)));
}
.row__media svg { width: 100%; height: 100%; display: block; }
.row__kicker { color: var(--accent); font-weight: 700; font-size: 0.82rem; letter-spacing: 0.06em; text-transform: uppercase; }
@media (max-width: 760px) {
  .row { grid-template-columns: 1fr; }
  .row:nth-child(even) .row__media { order: 0; }
}

/* ---------- "built for" strip ---------- */
.strip { display: flex; flex-wrap: wrap; gap: 0.7rem 1rem; align-items: center; justify-content: center; }
.chip {
  display: inline-flex; align-items: center; gap: 0.5rem; font-weight: 600; font-size: 0.92rem;
  color: var(--muted); background: var(--surface); padding: 0.55rem 1rem; border-radius: var(--radius-pill);
  box-shadow: var(--shadow-sm);
}
.chip svg { width: 18px; height: 18px; color: var(--accent); }

/* ---------- platforms ---------- */
.platforms { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1rem; }
@media (max-width: 820px) { .platforms { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 460px) { .platforms { grid-template-columns: 1fr; } }
.platform {
  background: var(--surface); border-radius: var(--radius-lg); padding: 1.4rem; box-shadow: var(--shadow-sm);
  text-align: center;
}
.platform__ico { width: 44px; height: 44px; margin: 0 auto 0.7rem; color: var(--text); }
.platform__ico svg { width: 100%; height: 100%; }
.platform h3 { font-size: 1.05rem; margin: 0 0 0.3rem; }
.platform .pill { margin-top: 0.6rem; }

/* ---------- roadmap timeline ---------- */
.timeline { position: relative; margin: 2rem 0 0; padding-left: 34px; }
.timeline::before {
  content: ""; position: absolute; left: 10px; top: 6px; bottom: 6px; width: 2px;
  background: linear-gradient(to bottom, var(--accent), var(--accent2), var(--accent3));
}
.tl { position: relative; padding: 0 0 2rem; }
.tl::before {
  content: ""; position: absolute; left: -32px; top: 3px; width: 22px; height: 22px; border-radius: 50%;
  background: var(--surface); box-shadow: 0 0 0 4px color-mix(in srgb, var(--accent) 25%, transparent);
  display: grid; place-items: center;
}
.tl--done::before { background: var(--accent); box-shadow: 0 0 0 4px color-mix(in srgb, var(--accent) 25%, transparent); }
.tl--now::before { background: var(--accent3); box-shadow: 0 0 0 4px color-mix(in srgb, var(--accent3) 28%, transparent); }
.tl__when { font-weight: 700; color: var(--accent); font-size: 0.85rem; letter-spacing: 0.04em; text-transform: uppercase; }
.tl h3 { margin: 0.2rem 0 0.4rem; }

/* ---------- pricing ---------- */
.plans { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.2rem; align-items: start; }
@media (max-width: 860px) { .plans { grid-template-columns: 1fr; } }
.plan { background: var(--surface); border-radius: var(--radius-lg); padding: 1.9rem; box-shadow: var(--shadow-md); position: relative; }
.plan--featured { box-shadow: var(--shadow-lg); outline: 2px solid var(--accent); }
.plan__name { font-weight: 700; font-size: 1.18rem; font-family: var(--font-display); }
.plan__tag { color: var(--muted); font-size: 0.92rem; margin: 0.2rem 0 1rem; }
.plan__price { font-size: 2.2rem; font-weight: 800; font-family: var(--font-display); letter-spacing: -0.02em; }
.plan__price small { font-size: 0.95rem; font-weight: 500; color: var(--muted); }
.plan__alt { font-size: 0.85rem; color: var(--faint); margin-top: 0.2rem; }
.plan ul { list-style: none; padding: 0; margin: 1.2rem 0 0; }
.plan li { display: flex; gap: 0.6rem; padding: 0.4rem 0; font-size: 0.96rem; }
.plan li svg { flex: none; width: 18px; height: 18px; color: var(--accent); margin-top: 3px; }

/* ---------- banner / CTA ---------- */
.banner {
  background: linear-gradient(135deg, var(--accent), var(--accent-600) 55%, var(--accent2));
  color: #fff; border-radius: var(--radius-xl); padding: clamp(2.2rem, 5vw, 3.6rem);
  box-shadow: var(--shadow-lg); text-align: center; position: relative; overflow: hidden;
}
.banner::after {
  content: ""; position: absolute; inset: auto -10% -60% auto; width: 420px; height: 420px; border-radius: 50%;
  background: radial-gradient(circle, rgba(255,255,255,0.22), transparent 60%);
}
.banner > * { position: relative; }
.banner h2, .banner a { color: #fff; }
.banner .btn--primary { background: #fff; color: var(--accent); }
.banner .btn--primary:hover { background: #eef2f8; }
.banner .btn--ghost { background: rgba(255,255,255,0.16); color: #fff; }
.banner .btn--ghost:hover { background: rgba(255,255,255,0.26); }
.banner p { max-width: 54ch; margin-left: auto; margin-right: auto; }
.banner .btn-row { justify-content: center; }

/* ---------- stat / highlight band ---------- */
.highlight {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.2rem;
}
@media (max-width: 760px) { .highlight { grid-template-columns: 1fr; } }
.highlight .num { font-family: var(--font-display); font-size: 2.1rem; font-weight: 800; color: var(--accent); letter-spacing: -0.02em; }

/* ---------- key/value (company facts) ---------- */
.kv { display: grid; grid-template-columns: 180px 1fr; gap: 0.5rem 1.4rem; }
.kv dt { color: var(--muted); font-weight: 600; }
.kv dd { margin: 0; }
@media (max-width: 560px) { .kv { grid-template-columns: 1fr; } .kv dd { margin-bottom: 0.6rem; } }

/* ---------- changelog ---------- */
.log { list-style: none; padding: 0; margin: 0; }
.log li { background: var(--surface); border-radius: var(--radius); box-shadow: var(--shadow-sm); padding: 1.2rem 1.4rem; margin-bottom: 1rem; }
.log .ver { font-family: var(--font-display); font-weight: 700; }
.log .date { color: var(--faint); font-size: 0.85rem; }

/* ---------- FAQ ---------- */
.faq { display: grid; gap: 0.8rem; }
.faq details {
  background: var(--surface); border-radius: var(--radius); box-shadow: var(--shadow-sm);
  padding: 1rem 1.2rem;
}
.faq summary { cursor: pointer; font-weight: 600; list-style: none; display: flex; justify-content: space-between; gap: 1rem; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; color: var(--accent); font-weight: 700; font-size: 1.3rem; line-height: 1; }
.faq details[open] summary::after { content: "−"; }
.faq details p { margin: 0.8rem 0 0; color: var(--muted); }

/* ---------- footer ---------- */
.footer { background: var(--surface); margin-top: 2rem; box-shadow: 0 -1px 0 var(--hairline); }
.footer__inner { display: flex; flex-wrap: wrap; gap: 1.5rem 2.5rem; justify-content: space-between; padding: 3.2rem 0 2.5rem; }
.footer__col h4 { font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--faint); margin-bottom: 0.8rem; }
.footer__col ul { list-style: none; padding: 0; margin: 0; }
.footer__col li { margin: 0.4rem 0; }
.footer__col a { color: var(--muted); font-size: 0.95rem; }
.footer__brand { max-width: 280px; }
.footer__brand p { margin-top: 0.8rem; }
.footer__legal { color: var(--faint); font-size: 0.82rem; padding-bottom: 2.5rem; line-height: 1.7; }
.footer__legal p { margin: 0.2rem 0; }

/* ---------- utilities (no inline styles → strict CSP) ---------- */
.mt-0 { margin-top: 0; }
.mt-sm { margin-top: 0.6rem; }
.mt-lg { margin-top: 1.4rem; }
.mt-xl { margin-top: 2.2rem; }
.mb-xl { margin-bottom: 2.5rem; }
.grid--center { align-items: center; }
.stack > * + * { margin-top: 1rem; }
.stack-lg > * + * { margin-top: 1.5rem; }
.plain-list { list-style: none; padding: 0; margin: 0; }
.maxw { max-width: 62ch; }
.mx-auto { margin-left: auto; margin-right: auto; }

.skip { position: absolute; left: -999px; }
.skip:focus { left: 1rem; top: 1rem; background: var(--accent); color: #fff; padding: 0.6rem 1rem; border-radius: var(--radius); z-index: 100; }

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
  .device, .device:hover { transform: none; }
}