:root {
  color-scheme: dark;
  --seo-bg: #06101e;
  --seo-bg-soft: #0a1728;
  --seo-card: rgba(13, 27, 47, 0.82);
  --seo-card-solid: #0d1b2f;
  --seo-line: rgba(148, 163, 184, 0.16);
  --seo-text: #eff6ff;
  --seo-muted: #a9bad1;
  --seo-blue: #60a5fa;
  --seo-blue-strong: #3b82f6;
  --seo-cyan: #67e8f9;
  --seo-green: #6ee7b7;
  --seo-warn: #fcd34d;
  --seo-shadow: 0 22px 70px rgba(0, 0, 0, 0.28);
  --seo-radius: 24px;
  --seo-shell: 1160px;
}

html[data-theme="light"] {
  color-scheme: light;
  --seo-bg: #edf3f9;
  --seo-bg-soft: #f7fafc;
  --seo-card: rgba(255, 255, 255, 0.9);
  --seo-card-solid: #ffffff;
  --seo-line: rgba(15, 23, 42, 0.11);
  --seo-text: #0f172a;
  --seo-muted: #53657b;
  --seo-blue: #2563eb;
  --seo-blue-strong: #2563eb;
  --seo-cyan: #0891b2;
  --seo-green: #047857;
  --seo-warn: #b45309;
  --seo-shadow: 0 18px 52px rgba(15, 23, 42, 0.1);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--seo-text);
  background:
    radial-gradient(circle at 10% -10%, rgba(59, 130, 246, 0.18), transparent 34rem),
    radial-gradient(circle at 95% 14%, rgba(34, 211, 238, 0.1), transparent 28rem),
    var(--seo-bg);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.6;
}

a { color: inherit; }
img { max-width: 100%; }
button, a { -webkit-tap-highlight-color: transparent; }

.seo-skip {
  position: absolute;
  left: -9999px;
  top: 10px;
  z-index: 1000;
  padding: 10px 14px;
  border-radius: 12px;
  background: var(--seo-card-solid);
  color: var(--seo-text);
}
.seo-skip:focus { left: 10px; }

.seo-shell {
  width: min(var(--seo-shell), calc(100% - 32px));
  margin: 0 auto;
}

.seo-header {
  position: sticky;
  top: 0;
  z-index: 40;
  padding: 14px 0;
  background: color-mix(in srgb, var(--seo-bg) 82%, transparent);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--seo-line);
}

.seo-header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.seo-brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  font-weight: 900;
  letter-spacing: -0.03em;
}

.seo-brand img {
  width: 150px;
  height: auto;
  display: block;
}

.seo-nav {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
  flex-wrap: wrap;
}

.seo-nav a,
.seo-theme {
  min-height: 42px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 13px;
  border: 1px solid transparent;
  border-radius: 999px;
  background: transparent;
  color: var(--seo-muted);
  text-decoration: none;
  font: inherit;
  font-size: 0.92rem;
  font-weight: 750;
  cursor: pointer;
}

.seo-nav a:hover,
.seo-nav a:focus-visible,
.seo-theme:hover,
.seo-theme:focus-visible {
  color: var(--seo-text);
  border-color: var(--seo-line);
  outline: none;
}

.seo-nav .seo-nav-cta {
  color: #fff;
  background: var(--seo-blue-strong);
  border-color: var(--seo-blue-strong);
}

.seo-hero {
  padding: clamp(64px, 9vw, 118px) 0 70px;
}

.seo-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(340px, 0.92fr);
  gap: clamp(30px, 6vw, 78px);
  align-items: center;
}

.seo-kicker,
.seo-section-label {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  color: var(--seo-blue);
  font-size: 0.78rem;
  font-weight: 900;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.seo-kicker::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--seo-green);
  box-shadow: 0 0 0 6px color-mix(in srgb, var(--seo-green) 14%, transparent);
}

.seo-hero h1 {
  max-width: 10ch;
  margin: 18px 0 20px;
  font-size: clamp(3rem, 7.2vw, 6.3rem);
  line-height: 0.93;
  letter-spacing: -0.065em;
}

.seo-gradient {
  color: transparent;
  background: linear-gradient(110deg, var(--seo-blue), var(--seo-cyan));
  background-clip: text;
  -webkit-background-clip: text;
}

.seo-lead {
  max-width: 65ch;
  margin: 0;
  color: var(--seo-muted);
  font-size: clamp(1.05rem, 2vw, 1.24rem);
}

.seo-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 28px;
}

.seo-button {
  min-height: 50px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 0 19px;
  border-radius: 999px;
  border: 1px solid var(--seo-blue-strong);
  background: var(--seo-blue-strong);
  color: #fff;
  text-decoration: none;
  font-weight: 900;
  box-shadow: 0 12px 34px rgba(37, 99, 235, 0.22);
}

.seo-button:hover,
.seo-button:focus-visible { transform: translateY(-1px); outline: none; }
.seo-button.secondary {
  border-color: var(--seo-line);
  background: var(--seo-card);
  color: var(--seo-text);
  box-shadow: none;
}

.seo-trust {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
  color: var(--seo-muted);
  font-size: 0.92rem;
}
.seo-trust li::before { content: "✓"; color: var(--seo-green); margin-right: 7px; font-weight: 900; }

.seo-alert-demo {
  position: relative;
  padding: 24px;
  border: 1px solid var(--seo-line);
  border-radius: 30px;
  background: linear-gradient(165deg, color-mix(in srgb, var(--seo-card-solid) 94%, var(--seo-blue) 6%), var(--seo-card));
  box-shadow: var(--seo-shadow);
  overflow: hidden;
}
.seo-alert-demo::after {
  content: "";
  position: absolute;
  width: 220px;
  height: 220px;
  right: -110px;
  top: -110px;
  border-radius: 50%;
  background: rgba(59, 130, 246, 0.16);
  filter: blur(10px);
}

.seo-demo-head,
.seo-demo-pair,
.seo-demo-stat,
.seo-demo-foot { position: relative; z-index: 1; }
.seo-demo-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.seo-demo-head strong { font-size: 1.05rem; }
.seo-live {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 6px 10px;
  border-radius: 999px;
  color: var(--seo-green);
  background: color-mix(in srgb, var(--seo-green) 12%, transparent);
  border: 1px solid color-mix(in srgb, var(--seo-green) 30%, transparent);
  font-size: 0.75rem;
  font-weight: 900;
}
.seo-live::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: currentColor; }
.seo-demo-pair { margin-top: 32px; }
.seo-demo-pair small { display: block; color: var(--seo-muted); font-weight: 750; }
.seo-demo-pair b { display: block; margin-top: 4px; font-size: clamp(2rem, 5vw, 3.5rem); letter-spacing: -0.05em; }
.seo-demo-stat {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-top: 20px;
}
.seo-demo-stat div { padding: 14px; border: 1px solid var(--seo-line); border-radius: 16px; background: color-mix(in srgb, var(--seo-bg-soft) 78%, transparent); }
.seo-demo-stat span { display: block; color: var(--seo-muted); font-size: 0.78rem; }
.seo-demo-stat strong { display: block; margin-top: 4px; }
.seo-demo-foot { margin: 18px 0 0; color: var(--seo-muted); font-size: 0.9rem; }

.seo-section { padding: clamp(58px, 8vw, 96px) 0; }
.seo-section.alt { border-block: 1px solid var(--seo-line); background: color-mix(in srgb, var(--seo-bg-soft) 62%, transparent); }
.seo-heading { max-width: 760px; margin-bottom: 34px; }
.seo-heading h2 { margin: 10px 0 12px; font-size: clamp(2rem, 4.6vw, 3.8rem); line-height: 1; letter-spacing: -0.05em; }
.seo-heading p { margin: 0; color: var(--seo-muted); font-size: 1.06rem; }

.seo-grid-3,
.seo-grid-2 { display: grid; gap: 16px; }
.seo-grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.seo-grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }

.seo-card {
  padding: 24px;
  border: 1px solid var(--seo-line);
  border-radius: var(--seo-radius);
  background: var(--seo-card);
  box-shadow: 0 12px 36px rgba(0, 0, 0, 0.08);
}
.seo-card-icon { width: 44px; height: 44px; display: grid; place-items: center; border-radius: 14px; color: var(--seo-blue); background: color-mix(in srgb, var(--seo-blue) 13%, transparent); font-weight: 950; }
.seo-card h3 { margin: 18px 0 8px; font-size: 1.22rem; line-height: 1.15; }
.seo-card p { margin: 0; color: var(--seo-muted); }
.seo-card a { display: inline-flex; margin-top: 16px; color: var(--seo-blue); text-decoration: none; font-weight: 850; }

.seo-steps { counter-reset: step; display: grid; gap: 14px; }
.seo-step { counter-increment: step; display: grid; grid-template-columns: 54px 1fr; gap: 16px; align-items: start; padding: 22px; border: 1px solid var(--seo-line); border-radius: 20px; background: var(--seo-card); }
.seo-step::before { content: counter(step); width: 48px; height: 48px; display: grid; place-items: center; border-radius: 15px; color: #fff; background: var(--seo-blue-strong); font-weight: 950; }
.seo-step h3 { margin: 2px 0 5px; }
.seo-step p { margin: 0; color: var(--seo-muted); }

.seo-copy-grid { display: grid; grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr); gap: clamp(28px, 5vw, 70px); align-items: start; }
.seo-copy h2 { margin: 10px 0 18px; font-size: clamp(2.1rem, 4.5vw, 3.8rem); line-height: 1; letter-spacing: -0.05em; }
.seo-copy p { color: var(--seo-muted); }
.seo-copy strong { color: var(--seo-text); }
.seo-note { padding: 18px 20px; border-left: 4px solid var(--seo-warn); border-radius: 0 16px 16px 0; background: color-mix(in srgb, var(--seo-warn) 9%, transparent); color: var(--seo-muted); }

.seo-table-wrap { overflow-x: auto; border: 1px solid var(--seo-line); border-radius: 20px; background: var(--seo-card); }
.seo-table { width: 100%; min-width: 680px; border-collapse: collapse; }
.seo-table th, .seo-table td { padding: 16px 18px; text-align: left; border-bottom: 1px solid var(--seo-line); vertical-align: top; }
.seo-table th { color: var(--seo-muted); font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.08em; }
.seo-table tr:last-child td { border-bottom: 0; }

.seo-faq { display: grid; gap: 12px; }
.seo-faq details { border: 1px solid var(--seo-line); border-radius: 18px; background: var(--seo-card); padding: 0 20px; }
.seo-faq summary { padding: 19px 0; cursor: pointer; font-weight: 850; }
.seo-faq details p { margin: 0 0 20px; color: var(--seo-muted); }

.seo-final {
  padding: 34px;
  border: 1px solid color-mix(in srgb, var(--seo-blue) 34%, var(--seo-line));
  border-radius: 30px;
  background: linear-gradient(135deg, color-mix(in srgb, var(--seo-blue) 14%, var(--seo-card-solid)), var(--seo-card));
  box-shadow: var(--seo-shadow);
  text-align: center;
}
.seo-final h2 { margin: 0 auto 12px; max-width: 16ch; font-size: clamp(2rem, 5vw, 4rem); line-height: 1; letter-spacing: -0.05em; }
.seo-final p { max-width: 680px; margin: 0 auto; color: var(--seo-muted); }
.seo-final .seo-actions { justify-content: center; }

.seo-footer { margin-top: 80px; padding: 32px 0 42px; border-top: 1px solid var(--seo-line); color: var(--seo-muted); }
.seo-footer-inner,
.seo-footer > .seo-shell { display: flex; justify-content: space-between; gap: 20px; flex-wrap: wrap; }
.seo-footer nav { display: flex; gap: 15px; flex-wrap: wrap; }
.seo-footer a { text-decoration: none; }
.seo-footer a:hover { color: var(--seo-text); }

@media (max-width: 920px) {
  .seo-hero-grid,
  .seo-copy-grid { grid-template-columns: minmax(0, 1fr); }
  .seo-hero-grid > *,
  .seo-copy-grid > * { min-width: 0; }
  .seo-alert-demo { max-width: 660px; }
  .seo-grid-3 { grid-template-columns: 1fr 1fr; }
  .seo-nav a:not(.seo-nav-cta) { display: none; }
}

@media (max-width: 640px) {
  .seo-shell { width: min(100% - 22px, var(--seo-shell)); }
  .seo-header { position: static; }
  .seo-header-inner { gap: 8px; }
  .seo-brand img { width: 108px; }
  .seo-nav { gap: 4px; flex-wrap: nowrap; }
  .seo-theme { min-width: 38px; width: 38px; padding-inline: 0; }
  .seo-nav-cta { padding-inline: 10px !important; font-size: 0.78rem !important; white-space: nowrap; }
  .seo-hero { padding-top: 52px; }
  .seo-hero h1 { font-size: clamp(3rem, 16vw, 4.5rem); }
  .seo-grid-3,
  .seo-grid-2 { grid-template-columns: 1fr; }
  .seo-demo-stat { grid-template-columns: 1fr; }
  .seo-card,
  .seo-step { padding: 19px; }
  .seo-step { grid-template-columns: 46px 1fr; }
  .seo-step::before { width: 42px; height: 42px; }
  .seo-final { padding: 28px 18px; }
  .seo-actions .seo-button { width: 100%; }
  .seo-actions,
  .seo-button,
  .seo-alert-demo { min-width: 0; max-width: 100%; }
  .seo-gradient {
    overflow-wrap: anywhere;
    word-break: break-word;
    -webkit-box-decoration-break: clone;
    box-decoration-break: clone;
  }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; animation: none !important; }
}