/* Palette matches packages/frontend design tokens (docs/DESIGN_SYSTEM.md) */
:root {
  --color-primary: #1976D2;
  --color-primary-dark: #125a9c;
  --color-positive: #4CAF50;
  --color-warning: #FF9800;
  --color-text: #1a1f27;
  --color-text-muted: #5b6472;
  --color-bg: #ffffff;
  --color-bg-alt: #f4f7fb;
  --color-border: #e3e8ef;
  --radius: 14px;
  --container-width: 1120px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: "Roboto", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.55;
}

h1, h2, h3 { font-weight: 900; line-height: 1.15; margin: 0 0 .5em; }
h2 { font-size: clamp(1.6rem, 3vw, 2.2rem); text-align: center; margin-bottom: 1.2em; }
h3 { font-size: 1.15rem; margin-bottom: .35em; }
p { margin: 0 0 1em; }

.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 20px;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255,255,255,.9);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
}
.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.logo {
  font-weight: 900;
  font-size: 1.2rem;
  color: var(--color-text);
  text-decoration: none;
}
.logo span { color: var(--color-primary); }
.nav { display: flex; gap: 28px; }
.nav a {
  color: var(--color-text-muted);
  text-decoration: none;
  font-weight: 500;
  font-size: .95rem;
}
.nav a:hover { color: var(--color-primary); }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 26px;
  border-radius: 999px;
  font-weight: 700;
  text-decoration: none;
  font-size: 1rem;
  min-height: 48px;
  transition: transform .15s ease, box-shadow .15s ease;
}
.btn--primary {
  background: var(--color-primary);
  color: #fff;
  box-shadow: 0 8px 20px -6px rgba(25,118,210,.55);
}
.btn--primary:hover { transform: translateY(-1px); box-shadow: 0 10px 24px -6px rgba(25,118,210,.65); }
.btn--ghost {
  background: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
  padding: 12px 24px;
}
.btn--small { min-height: 40px; padding: 8px 18px; font-size: .9rem; }
.btn--large { padding: 18px 36px; font-size: 1.1rem; }

/* Hero */
.hero { padding: 72px 0 56px; background: var(--color-bg-alt); }
.hero__inner {
  display: grid;
  grid-template-columns: 1.1fr .9fr;
  gap: 48px;
  align-items: center;
}
.eyebrow {
  color: var(--color-primary);
  font-weight: 700;
  letter-spacing: .04em;
  text-transform: uppercase;
  font-size: .8rem;
  margin-bottom: .6em;
}
.hero h1 { font-size: clamp(2rem, 4.2vw, 3rem); }
.accent { color: var(--color-primary); }
.lead { font-size: 1.1rem; color: var(--color-text-muted); max-width: 46ch; }
.hero__actions { display: flex; gap: 14px; flex-wrap: wrap; margin: 26px 0 14px; }
.hero__note { font-size: .85rem; color: var(--color-text-muted); }

.phone-mock {
  background: #10151d;
  border-radius: 32px;
  padding: 22px 20px 26px;
  color: #fff;
  max-width: 300px;
  margin: 0 auto;
  box-shadow: 0 30px 60px -20px rgba(16,21,29,.45);
}
.phone-mock__notch { width: 60px; height: 6px; background: #2a3140; border-radius: 4px; margin: 0 auto 18px; }
.phone-mock__row {
  background: #1b2230;
  border-radius: 10px;
  padding: 10px 14px;
  margin-bottom: 8px;
  font-size: .9rem;
}
.phone-mock__row--voice { color: var(--color-warning); display: flex; align-items: center; gap: 8px; }
.dot { width: 8px; height: 8px; border-radius: 50%; background: var(--color-warning); animation: pulse 1.4s infinite; }
@keyframes pulse { 0%,100% { opacity: 1; } 50% { opacity: .3; } }
.phone-mock__total { font-weight: 700; font-size: 1.05rem; margin: 14px 0 8px; }
.phone-mock__pay { color: var(--color-positive); font-size: .85rem; font-weight: 500; }

/* 404 error page */
.error-page { padding: 88px 0; background: var(--color-bg-alt); min-height: calc(100vh - 64px - 200px); display: flex; align-items: center; }
.error-page__inner {
  display: grid;
  grid-template-columns: .8fr 1.2fr;
  gap: 56px;
  align-items: center;
}
.error-page__text .eyebrow { justify-content: flex-start; }
.error-page__text h1 { font-size: clamp(1.8rem, 3.6vw, 2.6rem); }
.error-page__links {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
}
.error-page__links a {
  color: var(--color-text-muted);
  text-decoration: none;
  font-weight: 500;
  font-size: .92rem;
  border-bottom: 1px dashed var(--color-border);
}
.error-page__links a:hover { color: var(--color-primary); border-bottom-color: var(--color-primary); }
.error-mock__code {
  font-size: 3.2rem;
  font-weight: 900;
  text-align: center;
  color: var(--color-warning);
  letter-spacing: .02em;
  margin: 6px 0 14px;
}

/* Problem */
.problem { padding: 64px 0; }
.problem__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}
.card {
  background: var(--color-bg-alt);
  border-radius: var(--radius);
  padding: 22px;
  font-size: .95rem;
  color: var(--color-text-muted);
}

/* Features */
.features { padding: 64px 0; background: var(--color-bg-alt); }
.features__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}
.feature {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 26px;
}
.feature__icon { font-size: 1.8rem; margin-bottom: 10px; }
.feature p { color: var(--color-text-muted); font-size: .95rem; margin: 0; }

/* How it works */
.how { padding: 64px 0; }
.how__steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
}
.how__steps li { display: flex; flex-direction: column; gap: 10px; }
.how__num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--color-primary);
  color: #fff;
  font-weight: 900;
}
.how__steps p { color: var(--color-text-muted); font-size: .92rem; margin: 0; }

/* Security (NFC / Tap to Phone) */
.security { padding: 64px 0; }
.security__lead {
  max-width: 62ch;
  margin: 0 auto 2em;
  text-align: center;
  color: var(--color-text-muted);
}
.security__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}
.security__grid .card { background: var(--color-bg-alt); }
.security__grid h3 { font-size: 1rem; }
.security__grid p { font-size: .9rem; }

/* Pricing */
.pricing { padding: 64px 0; background: var(--color-bg-alt); }
.pricing__inner { text-align: center; max-width: 640px; margin: 0 auto; }
.pricing__lead { color: var(--color-text-muted); }

/* FAQ */
.faq { padding: 64px 0; }
.faq__item {
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 16px 20px;
  margin-bottom: 12px;
}
.faq__item summary {
  cursor: pointer;
  font-weight: 700;
  list-style: none;
}
.faq__item summary::-webkit-details-marker { display: none; }
.faq__item summary::after { content: "+"; float: right; color: var(--color-primary); font-weight: 900; }
.faq__item[open] summary::after { content: "–"; }
.faq__item p { margin-top: 10px; color: var(--color-text-muted); }

/* Final CTA */
.cta-final {
  padding: 72px 0;
  text-align: center;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  color: #fff;
}
.cta-final h2 { color: #fff; }
.cta-final .btn--primary { background: #fff; color: var(--color-primary); box-shadow: none; }

/* Footer */
.site-footer { padding: 36px 0; background: #10151d; color: #b7c0cd; }
.site-footer__inner { text-align: center; }
.logo--footer { color: #fff; margin-bottom: 10px; }
.site-footer a { color: #fff; }
.site-footer__legal { font-size: .8rem; color: #8994a3; margin: 10px 0 0; line-height: 1.5; }
.site-footer__copy { font-size: .8rem; color: #6b7686; margin-top: 8px; }

/* Responsive */
@media (max-width: 880px) {
  .hero__inner { grid-template-columns: 1fr; }
  .hero__visual { order: -1; }
  .error-page__inner { grid-template-columns: 1fr; text-align: center; }
  .error-page__visual { order: -1; }
  .error-page__text .eyebrow { justify-content: center; }
  .error-page__links { justify-content: center; }
  .problem__grid { grid-template-columns: repeat(2, 1fr); }
  .features__grid { grid-template-columns: repeat(2, 1fr); }
  .how__steps { grid-template-columns: repeat(2, 1fr); }
  .security__grid { grid-template-columns: repeat(2, 1fr); }
  .nav { display: none; }
}
@media (max-width: 520px) {
  .problem__grid, .features__grid, .how__steps, .security__grid { grid-template-columns: 1fr; }
}