:root {
  --bg: #ffffff;
  --card: #ffffff;
  --text: #0b0d12;
  --muted: #4a5568;
  --primary: #2563eb;
  --primary-600: #1d4ed8;
  --ring: #e5e7eb;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; height: 100%; }
body { font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif; color: var(--text); background: linear-gradient(180deg, #ffffff, #fafafa 30%, #ffffff 100%); }
a { color: var(--text); text-decoration: none; }

.container { max-width: 1120px; padding: 0 20px; margin: 0 auto; }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 12px 16px; border-radius: 10px; border: 1px solid var(--ring); transition: .2s ease; }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-600); transform: translateY(-1px); }
.btn-secondary { background: transparent; color: var(--text); }
.btn-secondary:hover { background: rgba(255,255,255,.06); }

.site-header { position: sticky; top: 0; backdrop-filter: saturate(180%) blur(8px); background: rgba(255,255,255,.8); border-bottom: 1px solid var(--ring); z-index: 50; }
.site-header .container { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.logo { font-weight: 700; letter-spacing: .2px; }
.nav { display: flex; gap: 16px; align-items: center; }
.nav a { padding: 8px 10px; border-radius: 8px; }
.nav a:hover { background: rgba(0,0,0,.06); }
.lang-switch { display: inline-flex; gap: 8px; margin-left: 8px; }
.lang-btn { background: #f3f4f6; color: var(--text); border: 1px solid var(--ring); border-radius: 8px; padding: 6px 10px; cursor: pointer; transition: background .15s ease, border-color .15s ease, color .15s ease, box-shadow .15s ease; }
.lang-btn:hover { background: #eef2ff; border-color: var(--primary); }
.lang-btn.active { background: var(--primary); color: #fff; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(37,99,235,.15); }
.lang-btn:focus-visible { outline: none; box-shadow: 0 0 0 3px rgba(37,99,235,.25); }
.burger { display: none; background: transparent; color: var(--text); border: none; font-size: 22px; }

.hero { padding: 56px 0 24px; }
.hero-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 28px; align-items: center; }
.hero-text h1 { font-size: 36px; line-height: 1.2; margin: 0 0 12px; }
.hero-text p { color: var(--muted); margin: 0 0 16px; }
.hero-robot { width: 100%; max-width: 520px; margin: 0 0 16px; border-radius: 12px; border: 1px solid var(--ring); box-shadow: 0 8px 24px rgba(0,0,0,.06); }
.hero-actions { display: flex; gap: 12px; margin-top: 10px; }
.trust { margin-top: 12px; display: flex; gap: 14px; color: var(--muted); font-size: 14px; }
.hero-media { display: flex; justify-content: center; }
.hero-media img { width: 100%; max-width: 460px; border-radius: 16px; border: 1px solid var(--ring); box-shadow: 0 8px 24px rgba(0,0,0,.08); }

.features { padding: 40px 0; }
.features h2 { margin: 0 0 18px; }
.features-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.feature-card { background: var(--card); border: 1px solid var(--ring); border-radius: 14px; padding: 16px; box-shadow: 0 6px 16px rgba(0,0,0,.04); }
.feature-card h3 { margin: 0 0 8px; font-size: 18px; }
.feature-card p { margin: 0; color: var(--muted); }

.how { padding: 34px 0; }
.how-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.step { background: var(--card); border: 1px solid var(--ring); padding: 16px; border-radius: 14px; box-shadow: 0 6px 16px rgba(0,0,0,.04); }
.step-num { display: inline-flex; align-items: center; justify-content: center; width: 28px; height: 28px; border-radius: 999px; background: var(--primary); color: #fff; font-weight: 700; margin-bottom: 8px; }

.cta { padding: 34px 0; }
.cta-box { background: radial-gradient(100% 100% at 50% 0%, rgba(37,99,235,.10) 0%, rgba(37,99,235,0) 60%), var(--card); border: 1px solid var(--ring); padding: 22px; border-radius: 16px; text-align: center; box-shadow: 0 8px 24px rgba(0,0,0,.06); }
.cta-box h2 { margin: 0 0 8px; }
.cta-box p { color: var(--muted); margin: 0 0 14px; }

.faq { padding: 36px 0 52px; }
details { background: var(--card); border: 1px solid var(--ring); border-radius: 12px; padding: 12px 14px; box-shadow: 0 6px 16px rgba(0,0,0,.04); }
details + details { margin-top: 12px; }
details summary { cursor: pointer; font-weight: 600; }

.site-footer { border-top: 1px solid var(--ring); padding: 18px 0; color: var(--muted); background: #fff; }
.site-footer .container { display: flex; gap: 12px; justify-content: space-between; align-items: center; }
.site-footer nav a { color: var(--muted); }
.site-footer nav a + a { margin-left: 10px; }

@media (max-width: 920px) {
  .hero-grid { grid-template-columns: 1fr; }
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .how-grid { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  .nav { display: none; position: absolute; right: 12px; top: 64px; background: var(--card); border: 1px solid var(--ring); border-radius: 12px; flex-direction: column; padding: 8px; box-shadow: 0 10px 24px rgba(0,0,0,.08); }
  .nav a { padding: 10px 12px; }
  .burger { display: inline-flex; }
  .hero { padding-top: 32px; }
  .hero-text h1 { font-size: 26px; }
  .features-grid { grid-template-columns: 1fr; }
}