/* =========================================================
   CanRobot Brand Stylesheet v2
   Copilot Club style: Dark header + centered hero + feature circles
   ========================================================= */

:root {
  --c-bg: #ffffff;
  --c-bg-soft: #f6f8fc;
  --c-bg-dark: #000000;
  --c-text: #111827;
  --c-text-soft: #4b5563;
  --c-text-mute: #6b7280;
  --c-line: #e5e7eb;
  --c-line-dark: rgba(255,255,255,.12);

  --c-blue: #0078d4;
  --c-blue-deep: #004f8a;
  --c-blue-light: #59b9ff;
  --c-purple: #7b5cff;
  --c-purple-deep: #5b3df0;
  --c-pink: #d966b2;
  --c-cyan: #00b7c3;
  --c-accent: #ff5cd6;

  --grad-brand: linear-gradient(135deg, #0078d4 0%, #5b3df0 55%, #b13cff 100%);
  --grad-soft:  linear-gradient(135deg, #eaf2ff 0%, #efe9ff 100%);
  --grad-circle: conic-gradient(#59b9ff 0deg, #b13cff 120deg, #d966b2 200deg, #59b9ff 360deg);

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;

  --shadow-sm: 0 4px 12px rgba(15, 23, 42, .06);
  --shadow-md: 0 12px 32px rgba(15, 23, 42, .10);
  --shadow-lg: 0 24px 60px rgba(15, 23, 42, .16);

  --font-sans: "Inter", "Noto Sans KR", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.65;
  color: var(--c-text);
  background: var(--c-bg);
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { color: var(--c-blue-deep); text-decoration: none; }
a:hover { color: var(--c-purple-deep); }

.container {
  width: min(1180px, 92%);
  margin-inline: auto;
}

/* =============================================
   HEADER — Dark (Copilot Club style)
   ============================================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: #000;
  border-bottom: 1px solid var(--c-line-dark);
}
.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 0;
  height: 60px;
  gap: 16px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: #fff;
  flex-shrink: 0;
}
.brand:hover { color: #fff; }
.brand-mark {
  display: inline-grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: var(--grad-brand);
  color: #fff;
  font-weight: 800;
  font-size: .9rem;
}
.brand-text strong {
  display: block;
  font-weight: 800;
  font-size: 1rem;
  letter-spacing: .2px;
  color: #fff;
}
.site-nav {
  display: flex;
  align-items: center;
  gap: 2px;
  flex: 1;
  justify-content: center;
}
.site-nav a {
  padding: 8px 13px;
  border-radius: 8px;
  color: rgba(255,255,255,.78);
  font-weight: 500;
  font-size: .9rem;
  transition: background .2s, color .2s;
  white-space: nowrap;
}
.site-nav a:hover {
  background: rgba(255,255,255,.10);
  color: #fff;
}
.site-nav .nav-cta {
  margin-left: 12px;
  padding: 9px 20px;
  background: transparent;
  color: #fff;
  border: 1px solid rgba(255,255,255,.5);
  border-radius: 999px;
  font-weight: 600;
  font-size: .9rem;
  transition: background .2s, border-color .2s;
}
.site-nav .nav-cta:hover {
  background: rgba(255,255,255,.15);
  border-color: #fff;
  color: #fff;
}

.nav-toggle {
  display: none;
  background: transparent;
  border: 0;
  width: 40px;
  height: 40px;
  cursor: pointer;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  padding: 8px;
  flex-shrink: 0;
}
.nav-toggle span {
  display: block;
  height: 2px;
  background: #fff;
  border-radius: 2px;
}

/* =============================================
   HERO — Full dark, center-aligned (Copilot Club style)
   ============================================= */
.hero-dark {
  background: #000;
  color: #fff;
  text-align: center;
  padding: 100px 0 80px;
}
.hero-dark .hero-sub {
  font-size: .9rem;
  color: rgba(255,255,255,.55);
  letter-spacing: .8px;
  text-transform: uppercase;
  margin-bottom: 24px;
}
.hero-dark h1 {
  font-size: clamp(2.4rem, 5vw, 4rem);
  font-weight: 900;
  line-height: 1.18;
  letter-spacing: -.03em;
  margin: 0 0 24px;
  color: #fff;
}
.hero-dark h1 .grad {
  background: linear-gradient(90deg, var(--c-blue-light), var(--c-purple), var(--c-pink));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero-dark .hero-desc {
  font-size: 1.1rem;
  color: rgba(255,255,255,.68);
  max-width: 600px;
  margin: 0 auto 36px;
  line-height: 1.7;
}
.hero-dark .hero-ctas {
  display: flex;
  justify-content: center;
  gap: 14px;
  flex-wrap: wrap;
}

/* =============================================
   FEATURE CIRCLES — 4-column donut cards
   ============================================= */
.feature-section {
  background: #000;
  padding: 20px 0 100px;
}
.feature-circles {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  width: min(1100px, 92%);
  margin: 0 auto;
}
.feature-circle {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 20px;
}
/* Donut ring */
.fc-ring {
  position: relative;
  width: 160px;
  height: 160px;
  flex-shrink: 0;
}
.fc-ring svg {
  width: 160px;
  height: 160px;
  transform: rotate(-90deg);
}
.fc-ring .ring-bg {
  fill: none;
  stroke: rgba(255,255,255,.10);
  stroke-width: 10;
}
.fc-ring .ring-fill {
  fill: none;
  stroke-width: 10;
  stroke-linecap: round;
  stroke-dasharray: 408;
  stroke-dashoffset: 80;
  transition: stroke-dashoffset 1s ease;
}
.fc-ring:nth-child(1) .ring-fill,
.feature-circle:nth-child(1) .ring-fill { stroke: url(#g1); }
.feature-circle:nth-child(2) .ring-fill { stroke: url(#g2); }
.feature-circle:nth-child(3) .ring-fill { stroke: url(#g3); }
.feature-circle:nth-child(4) .ring-fill { stroke: url(#g4); }

.fc-ring-label {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
}
/* Arrow between circles */
.feature-arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--c-blue-light);
  font-size: 1.8rem;
  padding-top: 60px;
}
.fc-text h3 {
  margin: 0 0 8px;
  font-size: 1rem;
  font-weight: 700;
  color: #fff;
}
.fc-text p {
  margin: 0;
  font-size: .85rem;
  color: rgba(255,255,255,.6);
  line-height: 1.6;
}

/* =============================================
   BUTTONS
   ============================================= */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: 999px;
  font-weight: 600;
  font-size: .95rem;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform .15s ease, box-shadow .2s, opacity .2s;
  text-decoration: none;
}
.btn-primary {
  background: var(--grad-brand);
  color: #fff;
  box-shadow: var(--shadow-md);
}
.btn-primary:hover { transform: translateY(-1px); color: #fff; opacity: .92; }
.btn-ghost {
  background: rgba(255,255,255,.08);
  color: #fff;
  border-color: rgba(255,255,255,.28);
}
.btn-ghost:hover { background: rgba(255,255,255,.16); color: #fff; }
.btn-outline {
  background: transparent;
  color: var(--c-blue-deep);
  border-color: var(--c-blue);
}
.btn-white {
  background: #fff;
  color: var(--c-purple-deep);
  font-weight: 700;
}
.btn-white:hover { color: var(--c-purple-deep); opacity: .92; }

/* =============================================
   SECTIONS (white background pages)
   ============================================= */
.section { padding: 96px 0; }
.section-soft { background: var(--c-bg-soft); }
.section-dark { background: #000; color:#fff; }
.section-dark-navy { background: #0b1530; color: #fff; }

.section-head { text-align: center; max-width: 720px; margin: 0 auto 48px; }
.section-head .eyebrow {
  display: inline-block;
  padding: 4px 12px;
  background: var(--grad-soft);
  color: var(--c-purple-deep);
  border-radius: 999px;
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .4px;
  margin-bottom: 14px;
}
.section-head h2 {
  font-size: clamp(1.7rem, 3vw, 2.4rem);
  margin: 0 0 14px;
  font-weight: 800;
  letter-spacing: -.01em;
}
.section-head p { color: var(--c-text-soft); font-size: 1.02rem; }

/* Section head dark variant */
.section-dark .section-head .eyebrow,
.section-dark-navy .section-head .eyebrow {
  background: rgba(255,255,255,.08);
  color: rgba(255,255,255,.8);
}
.section-dark .section-head h2,
.section-dark-navy .section-head h2 { color: #fff; }
.section-dark .section-head p,
.section-dark-navy .section-head p { color: rgba(255,255,255,.6); }

/* Cards grid */
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.cards-2 { grid-template-columns: repeat(2, 1fr); }
.card {
  background: #fff;
  border: 1px solid var(--c-line);
  border-radius: var(--radius-md);
  padding: 28px;
  transition: transform .2s, box-shadow .2s, border-color .2s;
}
.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: rgba(123,92,255,.4);
}
.card .icon {
  width: 46px; height: 46px;
  display: grid; place-items: center;
  border-radius: 12px;
  background: var(--grad-soft);
  color: var(--c-purple-deep);
  font-size: 1.3rem;
  font-weight: 800;
  margin-bottom: 18px;
}
.card h3 { margin: 0 0 8px; font-size: 1.1rem; font-weight: 700; }
.card p { margin: 0; color: var(--c-text-soft); font-size: .94rem; }
.card .more {
  display: inline-block;
  margin-top: 14px;
  font-weight: 600;
  font-size: .88rem;
  color: var(--c-purple-deep);
}

/* Dark cards */
.card-dark {
  background: rgba(255,255,255,.04);
  border: 1px solid rgba(255,255,255,.10);
  border-radius: var(--radius-md);
  padding: 28px;
  transition: transform .2s, background .2s;
}
.card-dark:hover { transform: translateY(-3px); background: rgba(255,255,255,.07); }
.card-dark h3 { margin: 0 0 8px; font-size: 1.05rem; font-weight: 700; color: #fff; }
.card-dark p { margin: 0; color: rgba(255,255,255,.6); font-size: .9rem; }
.card-dark .more { margin-top: 14px; display: inline-block; font-size: .88rem; font-weight: 600; color: var(--c-blue-light); }

/* Highlight banner */
.highlight {
  background: var(--grad-brand);
  color: #fff;
  border-radius: var(--radius-lg);
  padding: 44px;
  display: grid;
  grid-template-columns: 1.5fr auto;
  gap: 28px;
  align-items: center;
  box-shadow: var(--shadow-lg);
}
.highlight h3 { margin: 0 0 6px; font-size: 1.5rem; font-weight: 800; }
.highlight p { margin: 0; opacity: .92; }
.highlight .btn-white { background: #fff; color: var(--c-purple-deep); }

/* Badge row */
.badge-row { display: flex; gap: 10px; margin-top: 22px; flex-wrap: wrap; justify-content: center; }
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: 999px;
  background: rgba(255,255,255,.06);
  border: 1px solid rgba(255,255,255,.20);
  font-size: .78rem;
  color: rgba(255,255,255,.88);
}

/* =============================================
   PAGE WRAP (subpages)
   ============================================= */
.page-wrap {
  max-width: 880px;
  margin: 0 auto;
  padding: 64px 24px 96px;
}
.page-header { text-align: left; margin-bottom: 40px; }
.page-header .eyebrow {
  display: inline-block;
  background: var(--grad-soft);
  color: var(--c-purple-deep);
  padding: 4px 12px;
  border-radius: 999px;
  font-weight: 700;
  font-size: .78rem;
  letter-spacing: .4px;
  margin-bottom: 14px;
}
.page-header h1 {
  font-size: clamp(2rem, 3.4vw, 2.8rem);
  margin: 0 0 12px;
  font-weight: 800;
  letter-spacing: -.01em;
}
.page-subtitle { color: var(--c-text-soft); font-size: 1.05rem; margin: 0; }

.prose h2 {
  margin-top: 48px;
  font-size: 1.5rem;
  font-weight: 800;
  border-left: 4px solid var(--c-purple);
  padding-left: 12px;
}
.prose h3 { margin-top: 32px; font-size: 1.15rem; font-weight: 700; }
.prose p, .prose li { color: var(--c-text-soft); }
.prose strong { color: var(--c-text); }
.prose ul, .prose ol { padding-left: 20px; }
.prose code {
  background: var(--c-bg-soft);
  padding: 2px 6px;
  border-radius: 6px;
  font-size: .9em;
}
.prose blockquote {
  margin: 24px 0;
  padding: 16px 20px;
  border-left: 4px solid var(--c-blue);
  background: var(--c-bg-soft);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--c-text-soft);
}
.prose table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0;
  font-size: .94rem;
}
.prose th, .prose td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--c-line);
  text-align: left;
}
.prose th { background: var(--c-bg-soft); font-weight: 700; }

/* Profile */
.profile-hero {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 36px;
  align-items: center;
  background: var(--grad-soft);
  border-radius: var(--radius-lg);
  padding: 36px;
  margin-bottom: 40px;
}
.profile-avatar {
  width: 180px; height: 180px;
  border-radius: 50%;
  background: var(--grad-brand);
  display: grid; place-items: center;
  color: #fff;
  font-size: 3.6rem;
  font-weight: 800;
  box-shadow: var(--shadow-md);
  margin: 0 auto;
}

/* Tech Lab sidebar layout */
.lab-layout {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 36px;
  width: min(1180px, 92%);
  margin: 48px auto 96px;
}
.lab-sidebar {
  background: var(--c-bg-soft);
  border-radius: var(--radius-md);
  padding: 24px;
  position: sticky;
  top: 76px;
  height: fit-content;
  border: 1px solid var(--c-line);
}
.lab-sidebar h4 {
  margin: 0 0 12px;
  font-size: .8rem;
  text-transform: uppercase;
  letter-spacing: .8px;
  color: var(--c-text-mute);
}
.lab-sidebar ul { list-style: none; padding: 0; margin: 0 0 20px; }
.lab-sidebar li a {
  display: block;
  padding: 8px 12px;
  border-radius: 8px;
  font-size: .92rem;
  color: var(--c-text-soft);
}
.lab-sidebar li a:hover, .lab-sidebar li a.active {
  background: #fff;
  color: var(--c-purple-deep);
  font-weight: 600;
  box-shadow: var(--shadow-sm);
}
.lab-content { min-width: 0; }
.lab-content .prose { max-width: 760px; }

/* =============================================
   COURSE — doc-style layout (sidebar + content)
   ============================================= */
.course-layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 44px;
  width: min(1200px, 92%);
  margin: 40px auto 96px;
  align-items: start;
}
.course-sidebar {
  position: sticky;
  top: 76px;
  background: var(--c-bg-soft);
  border: 1px solid var(--c-line);
  border-radius: var(--radius-md);
  padding: 22px 20px;
  height: fit-content;
  max-height: calc(100vh - 96px);
  overflow-y: auto;
}
.course-sidebar-title {
  display: block;
  font-size: 1.02rem;
  font-weight: 800;
  color: var(--c-text);
  margin-bottom: 6px;
  line-height: 1.35;
}
.course-sidebar-title:hover { color: var(--c-purple-deep); }
.course-client-tag {
  display: inline-block;
  font-size: .72rem;
  font-weight: 700;
  color: var(--c-purple-deep);
  background: #efe9ff;
  padding: 3px 10px;
  border-radius: 999px;
  margin-bottom: 14px;
}
.course-track-pills {
  display: flex;
  gap: 8px;
  margin: 14px 0 18px;
}
.course-track-pill {
  flex: 1;
  text-align: center;
  font-size: .82rem;
  font-weight: 700;
  padding: 7px 6px;
  border-radius: 999px;
  border: 1px solid var(--c-line);
  background: #fff;
  color: var(--c-text-soft);
  transition: all .15s;
}
.course-track-pill:hover { border-color: var(--c-purple); color: var(--c-purple-deep); }
.course-track-pill.active {
  background: var(--grad-brand);
  border-color: transparent;
  color: #fff;
  box-shadow: var(--shadow-sm);
}
.course-modules ul { list-style: none; padding: 0; margin: 0; }
.course-modules li { margin: 0; }
.course-modules li a {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 7px 11px;
  border-radius: 8px;
  font-size: .9rem;
  color: var(--c-text-soft);
  line-height: 1.4;
}
.course-modules li a:hover { background: #fff; color: var(--c-purple-deep); }
.course-modules li a.active {
  background: #fff;
  color: var(--c-purple-deep);
  font-weight: 700;
  box-shadow: var(--shadow-sm);
}
.course-mod-no {
  flex: 0 0 auto;
  font-size: .72rem;
  font-weight: 800;
  color: var(--c-blue);
  min-width: 26px;
}
.course-content { min-width: 0; }
.course-content .prose { max-width: 780px; }

/* 출처 크레딧 블록 */
.course-credit {
  margin-top: 56px;
  padding: 20px 24px;
  background: var(--grad-soft);
  border: 1px solid var(--c-line);
  border-radius: var(--radius-md);
  font-size: .88rem;
}
.course-credit-text { margin: 0 0 10px; color: var(--c-text-soft); }
.course-credit-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  list-style: none;
  padding: 0; margin: 0;
}
.course-credit-links a { font-weight: 600; }

/* 모바일 목차 토글 */
.course-sidebar-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: .9rem;
  background: #fff;
  border: 1px solid var(--c-line);
  border-radius: 10px;
  padding: 10px 16px;
  cursor: pointer;
  color: var(--c-text);
}
.course-sidebar-toggle span {
  width: 16px; height: 2px; background: var(--c-text);
  display: block;
}
.course-sidebar-toggle span + span { margin-top: -6px; }

@media (max-width: 960px) {
  .course-layout { grid-template-columns: 1fr; gap: 16px; }
  .course-sidebar-toggle { display: inline-flex; }
  .course-sidebar {
    position: static;
    max-height: none;
    display: none;
  }
  .course-sidebar.open { display: block; }
}

/* 과정 허브 트랙 카드 */
.course-hub-cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 22px;
  margin: 24px 0 8px;
}
.course-hub-card {
  display: flex;
  flex-direction: column;
  background: #fff;
  border: 1px solid var(--c-line);
  border-radius: var(--radius-md);
  padding: 26px 24px;
  box-shadow: var(--shadow-sm);
  transition: transform .2s, box-shadow .2s;
}
.course-hub-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}
.course-hub-card .hub-card-icon { font-size: 1.9rem; margin-bottom: 8px; }
.course-hub-card h3 { margin: 0 0 8px; font-size: 1.12rem; font-weight: 800; color: var(--c-text); }
.course-hub-card p { margin: 0 0 16px; font-size: .9rem; color: var(--c-text-soft); flex: 1; line-height: 1.65; }
.course-hub-card .hub-card-link { font-weight: 700; color: var(--c-blue); font-size: .9rem; }
@media (max-width: 720px) {
  .course-hub-cards { grid-template-columns: 1fr; }
}

/* 기업 맞춤 Lab 배너 */
.lab-client-banner {
  background: var(--grad-soft);
  border: 1px solid var(--c-line);
  border-radius: var(--radius-md);
  padding: 12px 18px;
  font-size: .9rem;
  color: var(--c-text-soft);
  margin-bottom: 22px;
}
.lab-client-banner strong { color: var(--c-purple-deep); }
.lab-client-banner em { font-style: normal; font-weight: 600; color: var(--c-text); }

/* Records gallery */
.records-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px,1fr));
  gap: 22px;
  margin-top: 28px;
}
.record-card {
  background: #fff;
  border: 1px solid var(--c-line);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: transform .2s, box-shadow .2s;
}
.record-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); }
.record-thumb {
  height: 160px;
  background: var(--grad-brand);
  display: grid; place-items: center;
  color: #fff;
  font-size: 2rem;
  font-weight: 800;
}
.record-body { padding: 18px 20px; }
.record-body .date { font-size: .8rem; color: var(--c-text-mute); }
.record-body h3 { margin: 6px 0 6px; font-size: 1rem; font-weight: 700; }
.record-body p { margin: 0; font-size: .9rem; color: var(--c-text-soft); }

/* =============================================
   FOOTER
   ============================================= */
.site-footer {
  background: #111;
  color: rgba(255,255,255,.72);
  padding: 64px 0 24px;
  margin-top: 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 36px;
  border-bottom: 1px solid rgba(255,255,255,.08);
}
.footer-brand { color: #fff; font-size: 1.05rem; margin: 0 0 6px; }
.footer-tagline { margin: 0; color: rgba(255,255,255,.55); font-size: .88rem; }
.footer-domain { margin: 12px 0 0; color: var(--c-cyan); font-weight: 600; font-size: .88rem; }
.footer-title {
  text-transform: uppercase;
  letter-spacing: .8px;
  font-size: .78rem;
  color: rgba(255,255,255,.45);
  margin: 0 0 12px;
}
.site-footer ul { list-style: none; padding: 0; margin: 0; }
.site-footer ul li { margin-bottom: 8px; }
.site-footer a { color: rgba(255,255,255,.72); }
.site-footer a:hover { color: #fff; }
.footer-bottom { padding-top: 20px; color: rgba(255,255,255,.4); font-size: .82rem; }

/* =============================================
   RESPONSIVE
   ============================================= */
@media (max-width: 1060px) {
  .feature-circles { grid-template-columns: repeat(2, 1fr); }
  .feature-arrow { display: none; }
}
@media (max-width: 960px) {
  .cards, .footer-grid, .profile-hero, .lab-layout { grid-template-columns: 1fr; }
  .cards-2 { grid-template-columns: 1fr; }
  .highlight { grid-template-columns: 1fr; text-align: left; }
  .lab-sidebar { position: static; }
  .profile-avatar { width: 130px; height: 130px; font-size: 2.6rem; }

  .nav-toggle { display: inline-flex; }
  .site-nav {
    position: absolute;
    top: 60px;
    left: 0; right: 0;
    background: #111;
    border-bottom: 1px solid rgba(255,255,255,.10);
    padding: 12px 20px 20px;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 2px;
    display: none;
    z-index: 100;
  }
  .site-nav.open { display: flex; }
  .site-nav a { color: rgba(255,255,255,.78); }
  .site-nav .nav-cta { margin: 10px 0 0; text-align: center; border-radius: 999px; }
}
@media (max-width: 640px) {
  .section { padding: 64px 0; }
  .hero-dark { padding: 72px 0 56px; }
  .hero-dark h1 { font-size: clamp(2rem, 7vw, 3rem); }
  .feature-circles { grid-template-columns: 1fr; }
}