:root {
  --rca-navy: #0f2747;
  --rca-navy-deep: #091a31;
  --rca-blue: #1f66d1;
  --rca-blue-strong: #174ea6;
  --rca-blue-soft: #eaf2ff;
  --rca-surface: #ffffff;
  --rca-surface-soft: #f5f8fc;
  --rca-text: #172033;
  --rca-muted: #627083;
  --rca-border: #dfe7f1;
  --rca-radius: 18px;
  --rca-radius-small: 12px;
  --rca-shadow: 0 18px 48px rgba(15, 39, 71, 0.09);
  --rca-content: 1180px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--rca-surface); color: var(--rca-text); font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; line-height: 1.6; }
a { color: inherit; }
img { display: block; max-width: 100%; height: auto; }
button, a { -webkit-tap-highlight-color: transparent; }
:focus-visible { outline: 3px solid var(--rca-blue); outline-offset: 4px; }
.container { width: min(calc(100% - 40px), var(--rca-content)); margin-inline: auto; }
.skip-link { position: fixed; top: 12px; left: 12px; z-index: 999; padding: 10px 14px; background: var(--rca-navy); color: #fff; border-radius: 8px; transform: translateY(-160%); }
.skip-link:focus { transform: translateY(0); }
.site-header { position: sticky; top: 0; z-index: 100; border-bottom: 1px solid rgba(223,231,241,.85); background: rgba(255,255,255,.94); backdrop-filter: blur(16px); }
.site-header__inner { width: min(calc(100% - 40px), var(--rca-content)); min-height: 78px; margin-inline: auto; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: inline-flex; align-items: center; gap: 12px; color: var(--rca-navy); text-decoration: none; }
.brand__mark { display: grid; place-items: center; width: 48px; height: 48px; border-radius: 14px; background: linear-gradient(145deg,var(--rca-navy),var(--rca-blue)); color: white; font-size: .95rem; font-weight: 800; letter-spacing: .05em; box-shadow: 0 8px 24px rgba(31,102,209,.22); }
.brand__text { display: grid; line-height: 1.15; }
.brand__text strong { font-size: 1rem; }
.brand__text small { margin-top: 4px; color: var(--rca-muted); font-size: .72rem; }
.site-navigation { display: flex; align-items: center; gap: 22px; }
.site-navigation > a:not(.btn) { color: #3b485b; font-size: .9rem; font-weight: 600; text-decoration: none; }
.site-navigation > a:not(.btn):hover { color: var(--rca-blue); }
.mobile-menu-toggle { display: none; width: 44px; height: 44px; padding: 10px; border: 1px solid var(--rca-border); border-radius: 12px; background: white; cursor: pointer; }
.mobile-menu-toggle span { display: block; height: 2px; margin: 5px 0; border-radius: 2px; background: var(--rca-navy); }
.site-main { min-height: 60vh; }
.section { padding: 88px 0; }
.page-placeholder { min-height: 620px; display: flex; align-items: center; background: radial-gradient(circle at 85% 10%,rgba(31,102,209,.12),transparent 30%), linear-gradient(180deg,#fff,var(--rca-surface-soft)); }
.eyebrow { margin: 0 0 14px; color: var(--rca-blue); font-size: .82rem; font-weight: 800; letter-spacing: .11em; text-transform: uppercase; }
h1,h2,h3 { margin-top: 0; color: var(--rca-navy); line-height: 1.12; }
h1 { max-width: 850px; margin-bottom: 22px; font-size: clamp(2.4rem,6vw,5rem); letter-spacing: -.045em; }
.lead { max-width: 720px; margin: 0 0 30px; color: var(--rca-muted); font-size: clamp(1.05rem,2vw,1.3rem); }
.button-group { display: flex; flex-wrap: wrap; gap: 12px; }
.btn { min-height: 46px; display: inline-flex; align-items: center; justify-content: center; padding: 11px 18px; border: 1px solid transparent; border-radius: 12px; font-size: .92rem; font-weight: 750; text-decoration: none; cursor: pointer; transition: transform 160ms ease, box-shadow 160ms ease, background 160ms ease; }
.btn:hover { transform: translateY(-1px); }
.btn-primary { background: linear-gradient(135deg,var(--rca-blue),var(--rca-blue-strong)); color: white; box-shadow: 0 10px 24px rgba(31,102,209,.18); }
.btn-secondary { border-color: var(--rca-border); background: white; color: var(--rca-navy); }
.card { border: 1px solid var(--rca-border); border-radius: var(--rca-radius); background: var(--rca-surface); box-shadow: var(--rca-shadow); }
.feature-grid { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 22px; }
.screenshot-frame { overflow: hidden; border: 1px solid var(--rca-border); border-radius: var(--rca-radius); background: var(--rca-surface); box-shadow: var(--rca-shadow); }
.site-footer { padding: 54px 0 24px; background: var(--rca-navy-deep); color: #dce7f6; }
.site-footer__grid { display: grid; grid-template-columns: 1.2fr 1fr; gap: 44px; }
.site-footer__brand { display: inline-block; margin-bottom: 8px; color: white; font-size: 1.05rem; }
.site-footer p { max-width: 500px; margin: 0; color: #aebcd0; }
.site-footer__links { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 10px 22px; }
.site-footer__links a { color: #dce7f6; text-decoration: none; }
.site-footer__bottom { margin-top: 36px; padding-top: 18px; border-top: 1px solid rgba(255,255,255,.12); color: #8fa1ba; font-size: .85rem; }
@media (max-width: 980px) { .site-navigation { gap: 14px; } .site-navigation > a:not(.btn) { font-size: .84rem; } .site-navigation__cta { display: none; } .feature-grid { grid-template-columns: repeat(2,minmax(0,1fr)); } }
@media (max-width: 768px) { .site-header__inner { min-height: 70px; } .brand__text small { display: none; } .mobile-menu-toggle { display: block; } .site-navigation { position: absolute; top: calc(100% + 1px); left: 20px; right: 20px; display: none; align-items: stretch; flex-direction: column; gap: 2px; padding: 14px; border: 1px solid var(--rca-border); border-radius: 16px; background: white; box-shadow: var(--rca-shadow); } .site-navigation.is-open { display: flex; } .site-navigation > a:not(.btn) { padding: 11px 10px; border-radius: 10px; } .site-navigation__cta { display: inline-flex; margin-top: 6px; } .section { padding: 64px 0; } .page-placeholder { min-height: 540px; } .feature-grid { grid-template-columns: 1fr; } .site-footer__grid { grid-template-columns: 1fr; } .site-footer__links { grid-template-columns: 1fr; } }
@media (max-width: 480px) { .container,.site-header__inner { width: min(calc(100% - 28px),var(--rca-content)); } h1 { font-size: clamp(2.2rem,13vw,3.5rem); } .button-group { flex-direction: column; align-items: stretch; } .btn { width: 100%; } }
@media (prefers-reduced-motion: reduce) { *,*::before,*::after { scroll-behavior: auto !important; transition-duration: .01ms !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; } }

/* TASK 3 — homepage commercial components */

.hero {
  background:
    radial-gradient(circle at 80% 15%, rgba(31,102,209,.14), transparent 30%),
    linear-gradient(180deg, #fff, #f7faff);
}

.hero__grid {
  display: grid;
  grid-template-columns: 1.15fr .85fr;
  align-items: center;
  gap: 48px;
}

.hero__visual {
  padding: 16px;
}

.product-window {
  min-height: 390px;
  border-radius: 14px;
  background: linear-gradient(145deg, #0f2747, #1f66d1);
  color: white;
  overflow: hidden;
}

.product-window__top {
  display: flex;
  gap: 7px;
  padding: 14px;
  background: rgba(255,255,255,.08);
}

.product-window__top span {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: rgba(255,255,255,.55);
}

.product-window__body {
  padding: 48px 34px;
}

.product-window__body .eyebrow {
  color: #bcd4ff;
}

.product-window__body strong {
  display: block;
  max-width: 420px;
  font-size: clamp(1.7rem, 4vw, 2.7rem);
  line-height: 1.05;
}

.product-window__body p:last-child {
  max-width: 390px;
  color: #dbe8ff;
}

.section-soft {
  background: var(--rca-surface-soft);
}

.section-accent {
  background: var(--rca-navy);
  color: white;
}

.section-accent h2,
.section-accent .eyebrow {
  color: white;
}

.section-accent p {
  color: #d5e1f0;
}

.feature-card {
  padding: 24px;
}

.feature-card h3 {
  margin-bottom: 10px;
  font-size: 1.05rem;
}

.feature-card p {
  margin: 0;
  color: var(--rca-muted);
}

.feature-grid--four {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.workflow {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 13px;
  padding: 24px;
}

.workflow span {
  padding: 9px 13px;
  border-radius: 10px;
  background: var(--rca-blue-soft);
  color: var(--rca-navy);
  font-weight: 700;
}

.workflow b {
  color: var(--rca-blue);
}

.split-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.pricing-preview {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 22px;
}

.pricing-card {
  position: relative;
  padding: 28px;
}

.pricing-card--recommended {
  border-color: rgba(31,102,209,.45);
  box-shadow: 0 24px 56px rgba(31,102,209,.15);
}

.pricing-card__label {
  display: block;
  margin-bottom: 18px;
  color: var(--rca-muted);
  font-weight: 700;
}

.pricing-card strong {
  display: block;
  margin-bottom: 12px;
  color: var(--rca-navy);
  font-size: 2rem;
}

.pricing-card strong small {
  font-size: .8rem;
}

.pricing-badge {
  position: absolute;
  top: 18px;
  right: 18px;
  padding: 6px 9px;
  border-radius: 999px;
  background: var(--rca-blue-soft);
  color: var(--rca-blue-strong);
  font-size: .72rem;
  font-weight: 800;
}

.pricing-note {
  margin: 18px 0 0;
  color: var(--rca-muted);
  font-size: .85rem;
}

.section-actions {
  margin-top: 28px;
}

.contact-cta {
  background:
    linear-gradient(135deg, #edf4ff, #f8fbff);
}

.contact-cta__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 40px;
}

.contact-cta__inner h2 {
  max-width: 720px;
}

.contact-cta__inner p {
  max-width: 700px;
  color: var(--rca-muted);
}

@media (max-width: 980px) {
  .hero__grid,
  .split-content {
    grid-template-columns: 1fr;
  }

  .feature-grid--four {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 768px) {
  .hero__grid {
    gap: 30px;
  }

  .product-window {
    min-height: 300px;
  }

  .pricing-preview,
  .feature-grid--four {
    grid-template-columns: 1fr;
  }

  .contact-cta__inner {
    align-items: stretch;
    flex-direction: column;
  }
}

/* TASK 4 — detailed features page */

.features-hero {
  background:
    radial-gradient(
      circle at 82% 15%,
      rgba(31, 102, 209, 0.13),
      transparent 32%
    ),
    linear-gradient(
      180deg,
      #ffffff,
      var(--rca-surface-soft)
    );
}

.features-hero h1 {
  max-width: 980px;
}

.feature-domain-grid {
  display: grid;
  grid-template-columns:
    repeat(2, minmax(0, 1fr));
  gap: 24px;
}

.feature-domain-card {
  padding: 30px;
}

.feature-domain-card--wide {
  grid-column: 1 / -1;
}

.feature-domain-card h2 {
  margin-bottom: 20px;
  font-size: clamp(1.55rem, 3vw, 2.1rem);
}

.feature-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 10px;
}

.feature-list li {
  position: relative;
  padding: 12px 14px 12px 40px;
  border: 1px solid var(--rca-border);
  border-radius: 12px;
  background: var(--rca-surface-soft);
  color: var(--rca-text);
  font-weight: 650;
}

.feature-list li::before {
  content: "✓";
  position: absolute;
  left: 14px;
  top: 12px;
  color: var(--rca-blue);
  font-weight: 900;
}

.feature-list--columns {
  grid-template-columns:
    repeat(3, minmax(0, 1fr));
}

@media (max-width: 768px) {
  .feature-domain-grid {
    grid-template-columns: 1fr;
  }

  .feature-domain-card--wide {
    grid-column: auto;
  }

  .feature-list--columns {
    grid-template-columns: 1fr;
  }
}

/* TASK 5 — pricing page */

.pricing-hero {
  background:
    radial-gradient(
      circle at 82% 12%,
      rgba(31, 102, 209, 0.14),
      transparent 32%
    ),
    linear-gradient(
      180deg,
      #ffffff,
      var(--rca-surface-soft)
    );
}

.pricing-page-grid {
  display: grid;
  grid-template-columns:
    repeat(3, minmax(0, 1fr));
  gap: 24px;
  align-items: stretch;
}

.pricing-card--page {
  display: flex;
  flex-direction: column;
  min-height: 430px;
}

.pricing-card--page .btn {
  margin-top: auto;
}

.pricing-card__position {
  color: var(--rca-navy);
  font-weight: 800;
}

.pricing-validation-note {
  margin-top: 26px;
  padding: 22px 24px;
  border-style: dashed;
  background: var(--rca-surface-soft);
}

.pricing-validation-note strong {
  color: var(--rca-navy);
}

.pricing-validation-note p {
  margin-bottom: 0;
  color: var(--rca-muted);
}

@media (max-width: 900px) {
  .pricing-page-grid {
    grid-template-columns: 1fr;
  }

  .pricing-card--page {
    min-height: 0;
  }
}

/* TASK 6B — real RCA V6 screenshots */
.screenshot-frame{margin:0;overflow:hidden;background:#fff}
.screenshot-frame img{width:100%;height:auto;display:block}
.screenshot-caption{padding:10px 14px;border-top:1px solid var(--rca-border);color:var(--rca-muted);background:#fff;font-size:.78rem}
.product-showcase-section{background:#fff}
.product-showcase-section>.container>.lead{margin-bottom:46px}
.product-showcase-grid{display:grid;gap:64px}
.product-showcase-item{display:grid;grid-template-columns:.72fr 1.28fr;gap:42px;align-items:center}
.product-showcase-item--reverse{grid-template-columns:1.28fr .72fr}
.product-showcase-item--reverse>div{order:2}
.product-showcase-item--reverse>figure{order:1}
.product-showcase-item h3{font-size:clamp(1.5rem,3vw,2.25rem)}
.product-showcase-item p:not(.eyebrow){color:var(--rca-muted)}
@media(max-width:900px){
  .product-showcase-item,.product-showcase-item--reverse{grid-template-columns:1fr;gap:24px}
  .product-showcase-item--reverse>div,.product-showcase-item--reverse>figure{order:initial}
}

/* TASK 8 R4 — idempotent refinement */
.hero h1,
.features-hero h1,
.pricing-hero h1 {
  font-size: clamp(2.9rem, 5.25vw, 5.35rem);
  line-height: 1;
}

.screenshot-frame--hero {
  width: min(118%, 760px);
  justify-self: end;
}

.feature-domain-card {
  padding: 26px;
}

.feature-domain-card .feature-list {
  gap: 7px;
}

.feature-domain-card .feature-list li {
  padding-top: 9px;
  padding-bottom: 9px;
}

.feature-domain-card .feature-list li::before {
  top: 9px;
}

#services.section {
  padding-top: 64px;
  padding-bottom: 64px;
}

@media (max-width: 900px) {
  .hero h1,
  .features-hero h1,
  .pricing-hero h1 {
    font-size: clamp(2.6rem, 10.5vw, 4.1rem);
  }

  .screenshot-frame--hero {
    width: 100%;
    justify-self: stretch;
  }
}

/* TASK 9A1 — official RCA brand and legal content */
.brand__logo {
  width: 76px;
  height: 52px;
  object-fit: contain;
  flex: 0 0 auto;
}
.contact-details {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  margin-top: 24px;
}
.contact-details p { margin: 0; }
.legal-content { max-width: 900px; }
.legal-content h2 { margin-top: 34px; }
@media (max-width: 760px) {
  .brand__logo { width: 62px; height: 44px; }
  .contact-details { grid-template-columns: 1fr; }
}