:root {
  --bg: #f7f8fa; --panel: #ffffff; --text: #16191d; --muted: #5d6673; --line: #e1e4e8;
  --accent: #2f7de1; --accent-text: #ffffff; --up: #e0832f; --ok: #2e9b5f; --warn: #a87708;
  --soft: #eef3fb; --shadow: 0 10px 30px rgba(20, 30, 50, .10);
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111317; --panel: #191c21; --text: #e6e9ed; --muted: #97a0ad; --line: #2a2f36;
    --accent: #5a9cf0; --accent-text: #0d1117; --up: #f0a35a; --ok: #4cc283; --warn: #e0b84a;
    --soft: #1b2433; --shadow: 0 10px 30px rgba(0, 0, 0, .35);
  }
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--bg); color: var(--text);
       font: 16px/1.6 "Segoe UI", system-ui, -apple-system, sans-serif; }
a { color: var(--accent); }
img { max-width: 100%; }
.wrap { max-width: 1120px; margin: 0 auto; padding: 0 24px; }
@media (max-width: 600px) { .wrap { padding: 0 16px; } }

/* nav */
nav.top { position: sticky; top: 0; z-index: 10; background: color-mix(in srgb, var(--bg) 88%, transparent);
          backdrop-filter: blur(8px); border-bottom: 1px solid var(--line); }
nav.top .wrap { display: flex; align-items: center; gap: 20px; height: 60px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 18px; color: var(--text); text-decoration: none; }
.brand img { width: 28px; height: 28px; }
nav.top .links { display: flex; gap: 18px; margin-left: auto; align-items: center; }
nav.top .links a { color: var(--muted); text-decoration: none; font-size: 15px; }
nav.top .links a:hover { color: var(--text); }
@media (max-width: 760px) { nav.top .links a.hide-sm { display: none; } }

/* buttons */
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 10px 18px; border-radius: 8px;
       font: 600 15px/1 inherit; text-decoration: none; border: 1px solid var(--line); color: var(--text);
       background: var(--panel); cursor: pointer; white-space: nowrap; }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-text); }
.btn.big { padding: 14px 24px; font-size: 17px; }
.btn[aria-disabled="true"], .btn.primary[aria-disabled="true"] {
  background: transparent; color: var(--muted); border: 1px dashed var(--muted); cursor: default; }
nav.top .btn { padding: 8px 14px; font-size: 14px; }

/* hero */
.hero { padding: 72px 0 32px; text-align: center; }
.hero h1 { font-size: clamp(32px, 5vw, 52px); line-height: 1.12; margin: 0 0 16px; letter-spacing: -.5px; }
.hero p.lead { font-size: clamp(17px, 2.2vw, 20px); color: var(--muted); max-width: 720px; margin: 0 auto 28px; }
.hero .cta { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.hero .small { color: var(--muted); font-size: 14px; margin-top: 14px; }

/* live demo */
.demo { padding: 24px 0 56px; }
.frame { border: 1px solid var(--line); border-radius: 12px; overflow: hidden; background: var(--panel); box-shadow: var(--shadow); }
.frame .bar { display: flex; align-items: center; gap: 8px; padding: 9px 14px; border-bottom: 1px solid var(--line); }
.frame .bar i { width: 11px; height: 11px; border-radius: 50%; background: var(--line); }
.frame .bar span { margin-left: 10px; font-size: 13px; color: var(--muted); font-family: ui-monospace, Consolas, monospace; }
.frame iframe { display: block; width: 100%; height: 640px; border: 0; background: var(--bg); }
@media (max-width: 760px) { .frame iframe { height: 560px; } }
.demo .caption { text-align: center; color: var(--muted); font-size: 14px; margin-top: 12px; }

/* sections */
section { padding: 56px 0; }
section.alt { background: var(--panel); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
h2 { font-size: clamp(26px, 3.5vw, 34px); margin: 0 0 10px; letter-spacing: -.3px; }
.sub { color: var(--muted); margin: 0 0 32px; max-width: 760px; }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 18px; }
.card { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 20px; }
section.alt .card { background: var(--bg); }
.card h3 { margin: 0 0 6px; font-size: 17px; }
.card p { margin: 0; color: var(--muted); font-size: 15px; }
.card .ico { font-size: 22px; margin-bottom: 8px; display: block; }

.note { border-left: 3px solid var(--warn); background: var(--soft); padding: 14px 18px; border-radius: 6px; margin: 14px 0; }
.note h3 { margin: 0 0 4px; font-size: 16px; }
.note p { margin: 0; color: var(--muted); font-size: 15px; }

/* pricing */
.price-card { max-width: 440px; margin: 0 auto; text-align: center; padding: 32px; }
.price-card .amount { font-size: 48px; font-weight: 700; letter-spacing: -1px; margin: 8px 0 0; }
.price-card .per { color: var(--muted); margin-bottom: 18px; }
.price-card ul { text-align: left; padding: 0; list-style: none; margin: 0 0 24px; }
.price-card li { padding: 6px 0 6px 28px; position: relative; }
.price-card li::before { content: "✓"; position: absolute; left: 4px; color: var(--ok); font-weight: 700; }
.price-card .free { font-size: 14px; color: var(--muted); margin-top: 16px; }

/* faq */
details.q { border-bottom: 1px solid var(--line); padding: 14px 0; }
details.q summary { cursor: pointer; font-weight: 600; font-size: 17px; list-style: none; }
details.q summary::-webkit-details-marker { display: none; }
details.q summary::before { content: "+"; display: inline-block; width: 22px; color: var(--accent); font-weight: 700; }
details.q[open] summary::before { content: "–"; }
details.q p, details.q ol { color: var(--muted); margin: 10px 0 0 22px; }

/* footer */
footer { padding: 32px 0 48px; color: var(--muted); font-size: 14px; border-top: 1px solid var(--line); }
footer .wrap { display: flex; flex-wrap: wrap; gap: 10px 24px; align-items: center; }
footer a { color: var(--muted); }
footer .legal { flex-basis: 100%; font-size: 13px; }

/* legal pages */
.doc { max-width: 780px; padding: 48px 24px 72px; margin: 0 auto; }
.doc h1 { font-size: 32px; margin: 0 0 8px; }
.doc h2 { font-size: 22px; margin: 32px 0 8px; }
.doc .placeholder { background: color-mix(in srgb, var(--warn) 22%, transparent); padding: 0 4px; border-radius: 3px; }
.doc .lang { color: var(--muted); font-size: 14px; }