:root {
  --bg: #eef1f8;
  --bg-grad: radial-gradient(1100px 520px at 85% -10%, #e0e7fb 0%, transparent 60%),
    radial-gradient(800px 450px at -5% 10%, #e6e2fb 0%, transparent 55%);
  --surface: #ffffff;
  --surface-2: #f4f6fb;
  --border: #dde3ee;
  --text: #19212f;
  --muted: #5d6a80;
  --accent: #3554c9;
  --accent2: #6d4fd4;
  --ok: #1f8a53;
  --danger: #c0392b;
  --shadow: 0 1px 2px rgba(20, 30, 55, .04), 0 8px 30px rgba(20, 30, 55, .07);
  --radius: 18px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1220; --surface: #161e33; --surface-2: #1b2440; --border: #2a3452;
    --text: #e6ebf6; --muted: #93a1bd; --accent: #86a5ff; --accent2: #ad93ff;
    --ok: #5fd396; --danger: #ff8a7a;
    --bg-grad: radial-gradient(1100px 520px at 85% -10%, #17203a 0%, transparent 60%),
      radial-gradient(800px 450px at -5% 10%, #191634 0%, transparent 55%);
    --shadow: 0 1px 2px rgba(0,0,0,.3), 0 10px 34px rgba(0,0,0,.32);
  }
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0; font-family: "Inter", "Segoe UI", system-ui, sans-serif;
  background: var(--bg); background-image: var(--bg-grad); background-attachment: fixed;
  color: var(--text); line-height: 1.65; font-size: 16px; -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); }

/* header */
.top { position: sticky; top: 0; z-index: 20; backdrop-filter: blur(12px);
  background: color-mix(in srgb, var(--bg) 80%, transparent); border-bottom: 1px solid var(--border); }
.top-in { max-width: 860px; margin: 0 auto; padding: 13px 20px; display: flex; align-items: center; justify-content: space-between; }
.logo { display: flex; align-items: center; gap: 9px; font-weight: 800; font-size: 20px; letter-spacing: -.3px; color: var(--text); text-decoration: none; }
.logo .mark { width: 33px; height: 33px; border-radius: 10px; background: linear-gradient(135deg, var(--accent), var(--accent2)); display: grid; place-items: center; color: #fff; }
.logo b { background: linear-gradient(90deg, var(--accent), var(--accent2)); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; font-weight: 800; }

.wrap { max-width: 860px; margin: 0 auto; padding: 0 20px 50px; }

/* breadcrumb */
.crumbs { font-size: 13px; color: var(--muted); margin: 18px 0 0; }
.crumbs a { color: var(--muted); text-decoration: none; }
.crumbs a:hover { color: var(--accent); }

/* hero */
.hero { padding: 22px 0 8px; }
.pill { display: inline-block; font-size: 12.5px; font-weight: 600; color: var(--accent);
  background: color-mix(in srgb, var(--accent) 12%, transparent); padding: 5px 13px; border-radius: 100px; }
.hero h1 { font-size: clamp(28px, 5vw, 40px); line-height: 1.15; letter-spacing: -.8px; margin: 14px 0 12px; }
.hero .lead { font-size: 18px; color: var(--muted); max-width: 640px; }
.cta-row { display: flex; flex-wrap: wrap; gap: 10px; margin: 22px 0 8px; }
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 13px 24px; border-radius: 12px;
  font-weight: 600; text-decoration: none; font-size: 15px; box-shadow: var(--shadow); transition: transform .1s; }
.btn:active { transform: translateY(1px); }
.btn.primary { background: linear-gradient(135deg, var(--accent), var(--accent2)); color: #fff; }
.btn.ghost { background: var(--surface); color: var(--accent); box-shadow: none; border: 1px solid var(--border); }
.trust { display: flex; flex-wrap: wrap; gap: 16px; margin-top: 14px; font-size: 13.5px; color: var(--muted); }
.trust span { display: inline-flex; align-items: center; gap: 6px; }
.trust svg { color: var(--ok); flex-shrink: 0; }

/* content */
h2 { font-size: 23px; letter-spacing: -.3px; margin: 34px 0 6px; }
p { margin: 10px 0; }
.card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 22px 24px; box-shadow: var(--shadow); margin: 16px 0; }
.check { list-style: none; padding: 0; margin: 10px 0; }
.check li { position: relative; padding-left: 30px; margin: 12px 0; }
.check li::before { content: ""; position: absolute; left: 0; top: 4px; width: 18px; height: 18px; border-radius: 50%;
  background: color-mix(in srgb, var(--ok) 18%, transparent);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%231f8a53' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M20 6 9 17l-5-5'/%3E%3C/svg%3E");
  background-repeat: no-repeat; background-position: center; }
.note { border-left: 4px solid var(--accent); background: var(--surface-2); border-radius: 0 12px 12px 0; padding: 14px 18px; margin: 18px 0; font-size: 15px; }

/* FAQ */
.faq details { border: 1px solid var(--border); border-radius: 12px; background: var(--surface); margin: 10px 0; overflow: hidden; }
.faq summary { padding: 15px 18px; font-weight: 600; cursor: pointer; list-style: none; display: flex; justify-content: space-between; align-items: center; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; color: var(--accent); font-size: 22px; font-weight: 400; line-height: 1; }
.faq details[open] summary::after { content: "–"; }
.faq details > p { padding: 0 18px 16px; margin: 0; color: var(--muted); font-size: 15px; }

/* CTA banner */
.cta-banner { background: linear-gradient(135deg, var(--accent), var(--accent2)); color: #fff; border-radius: var(--radius); padding: 28px 26px; margin: 30px 0; text-align: center; box-shadow: var(--shadow); }
.cta-banner h2 { color: #fff; margin: 0 0 8px; }
.cta-banner p { color: rgba(255,255,255,.9); max-width: 560px; margin: 0 auto 18px; }
.cta-banner .btn.primary { background: #fff; color: var(--accent); }
.cta-banner .btn.ghost { background: transparent; color: #fff; border-color: rgba(255,255,255,.5); }

/* related */
.related { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 12px; margin: 14px 0; }
.related a { display: block; padding: 16px 18px; background: var(--surface); border: 1px solid var(--border); border-radius: 14px; text-decoration: none; color: var(--text); box-shadow: var(--shadow); transition: border-color .15s; }
.related a:hover { border-color: var(--accent); }
.related a b { display: block; margin-bottom: 3px; }
.related a span { font-size: 13px; color: var(--muted); }

.disclaimer { font-size: 13px; color: var(--muted); margin: 22px 0; }
footer { border-top: 1px solid var(--border); margin-top: 30px; }
.foot-in { max-width: 860px; margin: 0 auto; padding: 20px; font-size: 13px; color: var(--muted); text-align: center; }
.foot-in a { color: var(--muted); margin: 0 7px; }