:root {
  --bg: #ffffff;
  --bg-alt: #f5f7fb;
  --text: #1a2133;
  --muted: #5b6474;
  --border: #e3e7ee;
  --primary: #2f5bea;
  --primary-hover: #244bd0;
  --primary-soft: #e8eefc;
  --ok: #1f9d55;
  --radius: 14px;
  color-scheme: light;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 80px; }
body {
  margin: 0;
  font-family: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--primary); }
h1, h2, h3 { line-height: 1.2; margin: 0; letter-spacing: -0.02em; }
p { margin: 0; }

.wrap { max-width: 1160px; margin: 0 auto; padding: 0 24px; }
.wrap.narrow { max-width: 820px; }
.center { text-align: center; margin-top: 40px; }

.skip { position: absolute; left: -999px; top: 8px; background: #fff; padding: 8px 12px; border-radius: 8px; z-index: 100; }
.skip:focus { left: 8px; }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  font: inherit; font-weight: 600; text-decoration: none; cursor: pointer;
  border-radius: 10px; border: 1px solid transparent; padding: 10px 18px;
  transition: background .15s, transform .15s, box-shadow .15s;
}
.btn:focus-visible { outline: 3px solid rgba(47, 91, 234, .35); outline-offset: 2px; }
.btn-primary { background: var(--primary); color: #fff; box-shadow: 0 6px 18px rgba(47, 91, 234, .25); }
.btn-primary:hover { background: var(--primary-hover); transform: translateY(-1px); }
.btn-ghost { background: #fff; color: var(--text); border-color: var(--border); }
.btn-ghost:hover { background: var(--bg-alt); }
.btn-white { background: #fff; color: var(--primary); }
.btn-white:hover { transform: translateY(-1px); box-shadow: 0 8px 20px rgba(0, 0, 0, .15); }
.btn-sm { padding: 8px 14px; font-size: 14px; }
.btn-lg { padding: 14px 24px; font-size: 16px; }

.ic, .ic-lg { fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; flex: none; }
.ic { width: 18px; height: 18px; }
.ic-lg { width: 26px; height: 26px; }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255, 255, 255, .88); backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--border);
}
.nav { display: flex; align-items: center; gap: 24px; height: 64px; }
.logo { display: flex; align-items: center; gap: 10px; color: var(--text); text-decoration: none; font-weight: 700; font-size: 17px; }
.nav nav { display: flex; gap: 22px; margin-left: auto; }
.nav nav a { color: var(--muted); text-decoration: none; font-size: 15px; font-weight: 500; }
.nav nav a:hover { color: var(--text); }

/* Hero */
.hero { padding: 72px 0 88px; background: radial-gradient(1200px 500px at 85% -10%, #e9efff 0%, rgba(233, 239, 255, 0) 60%), var(--bg); overflow: hidden; }
.hero-grid { display: grid; grid-template-columns: 1.05fr 1fr; gap: 56px; align-items: center; }
.eyebrow { display: inline-block; font-size: 13px; font-weight: 600; color: var(--primary); background: var(--primary-soft); padding: 5px 12px; border-radius: 999px; margin-bottom: 20px; }
.hero h1 { font-size: clamp(34px, 5vw, 54px); font-weight: 800; }
.hl { color: var(--primary); }
.lead { font-size: 18px; color: var(--muted); margin-top: 20px; max-width: 560px; }
.cta-row { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 32px; }
.sub-cta { font-size: 14px; color: var(--muted); margin-top: 14px; }
.trust { list-style: none; padding: 0; margin: 28px 0 0; display: flex; flex-wrap: wrap; gap: 10px 22px; font-size: 14px; font-weight: 500; }
.trust li { display: flex; align-items: center; gap: 6px; }
.trust .ic { color: var(--ok); }

.hero-visual { position: relative; padding: 10px 30px 30px; }
.preview {
  border-radius: 10px; background: #fff;
  box-shadow: 0 2px 6px rgba(16, 24, 40, .06), 0 30px 60px -12px rgba(16, 24, 40, .22);
  transform: rotate(1.5deg);
  border: 1px solid var(--border);
}
.float-card {
  position: absolute; display: flex; align-items: center; gap: 12px;
  background: #fff; border: 1px solid var(--border); border-radius: 12px; padding: 12px 16px;
  box-shadow: 0 12px 30px rgba(16, 24, 40, .14); font-size: 14px;
}
.float-card strong { display: block; font-size: 14px; }
.float-card small { color: var(--muted); font-size: 12px; }
.float-card.score { left: -8px; bottom: 90px; }
.float-card.kw { right: 0; top: 40px; }
.ring {
  --c: var(--ok);
  width: 46px; height: 46px; border-radius: 50%; display: grid; place-items: center; flex: none;
  background: conic-gradient(var(--c) calc(var(--p) * 1%), #e5e7eb 0);
}
.ring b { width: 36px; height: 36px; border-radius: 50%; background: #fff; display: grid; place-items: center; font-size: 12px; }
.kw .ring { --c: var(--primary); }

/* Sections */
.section { padding: 88px 0; }
.section.alt { background: var(--bg-alt); }
.section h2 { font-size: clamp(28px, 3.5vw, 38px); font-weight: 800; text-align: center; }
.section-lead { text-align: center; color: var(--muted); font-size: 17px; max-width: 640px; margin: 14px auto 48px; }

/* Steps */
.steps { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; counter-reset: none; }
.steps li { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 26px 22px; position: relative; }
.num {
  display: grid; place-items: center; width: 38px; height: 38px; border-radius: 10px;
  background: var(--primary); color: #fff; font-weight: 700; margin-bottom: 16px;
}
.steps h3 { font-size: 18px; margin-bottom: 8px; }
.steps p { color: var(--muted); font-size: 15px; }

/* Features */
.features { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.feature { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; }
.feature .ic-lg { color: var(--primary); background: var(--primary-soft); padding: 9px; width: 44px; height: 44px; border-radius: 10px; margin-bottom: 14px; }
.feature h3 { font-size: 17px; margin-bottom: 6px; }
.feature p { color: var(--muted); font-size: 15px; }

/* Tips */
.tips-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.tip-card { border-radius: var(--radius); padding: 28px; border: 1px solid var(--border); }
.tip-card h3 { font-size: 20px; margin-bottom: 14px; }
.tip-card ul { margin: 0; padding: 0; list-style: none; }
.tip-card li { position: relative; padding-left: 30px; margin-top: 12px; color: #343c4c; }
.tip-card li::before { position: absolute; left: 0; top: 1px; width: 20px; height: 20px; border-radius: 50%; display: grid; place-items: center; font-size: 12px; font-weight: 700; }
.tip-card.do { background: #f2fbf5; border-color: #cdebd8; }
.tip-card.do h3 { color: #17733d; }
.tip-card.do li::before { content: '✓'; background: #d3f0dd; color: #17733d; }
.tip-card.dont { background: #fdf4f4; border-color: #f2d3d3; }
.tip-card.dont h3 { color: #b23434; }
.tip-card.dont li::before { content: '✕'; background: #f8dcdc; color: #b23434; }

/* FAQ */
.faq { margin-top: 40px; }
.faq details { background: #fff; border: 1px solid var(--border); border-radius: 12px; margin-bottom: 12px; }
.faq summary { cursor: pointer; padding: 18px 22px; font-weight: 600; list-style: none; display: flex; justify-content: space-between; gap: 16px; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: '+'; font-size: 22px; line-height: 1; color: var(--primary); }
.faq details[open] summary::after { content: '−'; }
.faq details p { padding: 0 22px 20px; color: var(--muted); }

/* CTA band */
.cta-band { background: linear-gradient(135deg, #2f5bea, #1c3fb8); color: #fff; text-align: center; padding: 80px 0; }
.cta-band h2 { font-size: clamp(28px, 3.5vw, 38px); font-weight: 800; }
.cta-band p { opacity: .9; margin: 12px 0 30px; font-size: 17px; }

/* Footer */
.site-footer { border-top: 1px solid var(--border); padding: 28px 0; font-size: 14px; color: var(--muted); }
.foot { display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.site-footer a { color: var(--muted); }

/* Responsive */
@media (max-width: 1000px) {
  .steps, .features { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 860px) {
  .nav nav { display: none; }
  .nav .btn { margin-left: auto; }
  .hero { padding: 48px 0 64px; }
  .hero-grid { grid-template-columns: 1fr; gap: 40px; }
  .hero-visual { max-width: 520px; margin: 0 auto; padding: 10px 16px 24px; }
  .tips-grid { grid-template-columns: 1fr; }
  .section { padding: 64px 0; }
}
@media (max-width: 560px) {
  .wrap { padding: 0 16px; }
  .steps, .features { grid-template-columns: 1fr; }
  .float-card { padding: 8px 12px; }
  .float-card.score { left: 0; bottom: 40px; }
  .float-card.kw { right: 0; top: 10px; }
  .cta-row .btn { width: 100%; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .btn { transition: none; }
}