/* =====================================================================
   RVAS SHARED SHELL — vX  (source of truth: frontier-agentic-devops-rvas)
   Canonical brand shell: tokens + nav + hero + glass stats + buttons +
   sections + cards + badges + steps + footer + reveal.
   Load this AFTER brand.css and AFTER any site-specific stylesheet so its
   shared components win. Sites override ONLY accent + module colors, in a
   small :root block loaded after this file.
   Do not edit a copy in place — edit shared/shell.css and re-copy.
   ===================================================================== */

/* ═══════════════════════════ TOKENS ════════════════════════════════ */
:root {
  /* Surfaces — RVAP white / blue-white */
  --c-900: #F5F8FE;
  --c-850: #FAFBFD;
  --c-800: #FFFFFF;
  --c-700: #F5F8FE;
  --c-600: #EEF1FA;
  --c-line: #E3E6ED;
  --c-line-soft: #DDE6F7;

  /* Text */
  --c-fg: #111827;
  --c-dim: #47494E;
  --c-faint: #6B7280;

  /* Accent — RVAP Blue. Sites override this pair + module colors only. */
  --c-accent: #1A77E3;
  --c-accent-dim: #0078D4;
  --c-accent-glow: rgba(26, 119, 227, 0.10);
  --c-hero-accent: #BFDBFE;
  /* Deprecated alias kept so existing var(--c-gold) references keep working. */
  --c-gold: var(--c-accent);
  --c-gold-dim: var(--c-accent-dim);
  --c-gold-glow: var(--c-accent-glow);

  /* Heading ink — RVAP Deep Navy */
  --c-heading: #032254;

  /* Hero gradient (Deep Navy -> RVAP Blue) */
  --hero-grad: linear-gradient(135deg, #032254 0%, #0F3A7A 60%, #1A77E3 100%);

  /* Difficulty */
  --c-beginner: #16a34a;
  --c-intermediate: #ca8a04;
  --c-advanced: #dc2626;

  /* Typography — RVAP brand: Aptos preferred, Outfit/Inter as web fallback */
  --font-display: "Aptos Display", "Outfit", "Segoe UI", system-ui, sans-serif;
  --font-body:    "Aptos", "Inter", "Segoe UI", system-ui, sans-serif;
  --font-mono: "Cascadia Code", "JetBrains Mono", "Fira Code", ui-monospace, "SF Mono", monospace;

  /* Layout */
  --maxw: 1200px;
  --r: 12px;
  --r-sm: 7px;
  --r-lg: 18px;
  --shadow: 0 4px 20px -8px rgba(3, 34, 84, 0.12), 0 1px 3px rgba(3, 34, 84, 0.06);
  --shadow-card: 0 1px 3px rgba(3, 34, 84, 0.08), 0 4px 12px rgba(3, 34, 84, 0.06);
  --ease: cubic-bezier(0.22, 1, 0.36, 1);

  /* Semantic z-index scale */
  --z-sticky: 100;
  --z-dropdown: 200;
  --z-modal: 400;
  --z-toast: 600;
}

/* ═══════════════════════════ RESET ════════════════════════════════ */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font-body);
  background: var(--c-900);
  color: var(--c-fg);
  line-height: 1.65;
  font-size: 16px;
  min-height: 100vh;
  overflow-x: hidden;
  display: flex;
  flex-direction: column;
}
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background: radial-gradient(900px 600px at 80% -10%, var(--c-accent-glow), transparent 65%);
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; }

/* ═══════════════════════════ TYPE SCALE ════════════════════════════ */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.06;
  letter-spacing: -0.01em;
  margin: 0;
  color: var(--c-heading);
  text-wrap: balance;
}
h1 { font-size: clamp(2.2rem, 5vw + 0.5rem, 4.2rem); }
h2 { font-size: clamp(1.6rem, 3vw + 0.4rem, 2.6rem); }
h3 { font-size: clamp(1.1rem, 2vw + 0.3rem, 1.5rem); }
h4 { font-size: 1rem; font-weight: 600; letter-spacing: 0; }
p { text-wrap: pretty; }
.mono { font-family: var(--font-mono); }

/* Eyebrow — mono coordinate label + accent dash */
.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.70rem;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--c-dim);
  display: inline-flex;
  align-items: center;
  gap: 0.7em;
}
.eyebrow::before {
  content: "";
  width: 18px;
  height: 2px;
  background: var(--c-accent);
  border-radius: 1px;
  flex-shrink: 0;
}

/* ═══════════════════════════ LAYOUT ════════════════════════════════ */
.wrap { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
.section { padding: 88px 0; }
.section-tight { padding: 56px 0; }
main { flex: 1 0 auto; }
@media (min-width: 768px) {
  .wrap, .container { padding: 0 40px; }
}

/* ═══════════════════════════ NAV ═══════════════════════════════════ */
.nav {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  backdrop-filter: blur(16px) saturate(160%);
  -webkit-backdrop-filter: blur(16px) saturate(160%);
  background: rgba(255, 255, 255, 0.92);
  border-bottom: 1px solid var(--c-line);
}
.nav-inner {
  display: flex;
  align-items: center;
  gap: 8px;
  height: 58px;
  padding: 0 24px;
  max-width: var(--maxw);
  margin: 0 auto;
}
@media (min-width: 768px) { .nav-inner { padding: 0 40px; gap: 16px; } }

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.95rem;
  letter-spacing: -0.01em;
  white-space: nowrap;
  color: var(--c-heading);
  flex-shrink: 0;
}
.rvap-nav-logo, .brand-logo { height: 32px; width: auto; display: block; }

.nav-links {
  display: none;
  align-items: center;
  gap: 4px;
  margin-left: auto;
  flex: 1;
}
@media (min-width: 768px) { .nav-links { display: flex; } }
.nav-links a {
  padding: 6px 11px;
  border-radius: var(--r-sm);
  font-size: 0.875rem;
  color: var(--c-dim);
  transition: color 0.2s, background 0.2s;
  font-weight: 500;
}
.nav-links a:hover, .nav-links a[aria-current="page"], .nav-links a.active {
  color: var(--c-fg);
  background: var(--c-600);
}
.nav-links a.cta {
  margin-left: 8px;
  background: var(--c-accent);
  color: #fff;
  font-weight: 700;
  padding: 7px 15px;
  border-radius: var(--r-sm);
}
.nav-links a.cta:hover { opacity: 0.9; background: var(--c-accent); color: #fff; }
.nav-links a.gh { color: var(--c-dim); font-weight: 600; }
.nav-links a.gh:hover { color: var(--c-accent); background: transparent; }

.nav-actions { margin-left: auto; display: flex; align-items: center; gap: 6px; }
@media (min-width: 768px) { .nav-actions { margin-left: 0; } }
.icon-btn {
  width: 36px; height: 36px;
  border: none;
  border-radius: var(--r-sm);
  background: transparent;
  color: var(--c-dim);
  display: grid;
  place-items: center;
  transition: background 0.2s, color 0.2s;
}
.icon-btn:hover { background: var(--c-600); color: var(--c-fg); }
.icon-btn:focus-visible { outline: 2px solid var(--c-accent); outline-offset: 2px; }
.nav-toggle { display: grid; }
@media (min-width: 768px) { .nav-toggle { display: none; } }

.nav-links.open {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 2px;
  position: absolute;
  top: 58px;
  left: 0; right: 0;
  background: #fff;
  border-bottom: 1px solid var(--c-line);
  padding: 12px 24px 16px;
  z-index: var(--z-dropdown);
}
.nav-links.open a { width: 100%; }
.nav-links.open a.cta { margin-left: 0; margin-top: 6px; }

/* ═══════════════════════════ HERO ══════════════════════════════════ */
.hero {
  position: relative;
  padding: 80px 0 72px;
  overflow: hidden;
  background: var(--hero-grad);
  color: #fff;
}
@media (min-width: 900px) { .hero { padding: 100px 0 88px; } }
.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: radial-gradient(circle, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
  background-size: 26px 26px;
}
.hero > .wrap, .hero > .container { position: relative; z-index: 1; }

.hero-compass {
  position: absolute;
  right: -60px;
  top: -40px;
  width: min(580px, 90vw);
  height: min(580px, 90vw);
  pointer-events: none;
  opacity: 0.22;
  color: #fff;
  z-index: 0;
  animation: compassSpin 120s linear infinite;
}
@keyframes compassSpin { from { transform: rotate(0deg); } to { transform: rotate(360deg); } }
@media (prefers-reduced-motion: reduce) { .hero-compass { animation: none; } }

.hero-grid { display: grid; gap: 56px 64px; align-items: center; }
@media (min-width: 900px) { .hero-grid { grid-template-columns: 1fr 1fr; } }

.hero h1, .hero h2 { color: #fff; }
.hero h1 { margin-top: 18px; }
.hero .accent { color: var(--c-hero-accent); }
.hero .eyebrow { color: rgba(255, 255, 255, 0.72); }
.hero .eyebrow::before { background: rgba(255, 255, 255, 0.5); }

.lede {
  margin: 20px 0 32px;
  font-size: clamp(1rem, 1.8vw + 0.4rem, 1.18rem);
  line-height: 1.7;
  max-width: 52ch;
  color: var(--c-dim);
}
.hero .lede { color: rgba(255, 255, 255, 0.82); }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; }

/* ── Glass stats (hero numbers) ──────────────────────────────────── */
.stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  margin-top: 52px;
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: 16px;
  overflow: hidden;
  background: rgba(255, 255, 255, 0.10);
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
  box-shadow: 0 24px 60px rgba(3, 34, 84, 0.28);
}
.stats.stats-4 { grid-template-columns: repeat(2, 1fr); }
@media (min-width: 620px) { .stats.stats-4 { grid-template-columns: repeat(4, 1fr); } }
.stat { padding: 22px 18px 20px; text-align: center; min-width: 0; }
.stat + .stat { border-left: 1px solid rgba(255, 255, 255, 0.16); }
.stats.stats-4 .stat:nth-child(3) { border-left: none; }
@media (min-width: 620px) { .stats.stats-4 .stat:nth-child(3) { border-left: 1px solid rgba(255, 255, 255, 0.16); } }
.stat-num {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 800;
  line-height: 1;
  color: #fff;
  letter-spacing: -0.02em;
}
.stat-lbl {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.72);
  margin-top: 8px;
}
.stat-dot { display: inline-block; width: 6px; height: 6px; border-radius: 50%; margin-right: 6px; background: currentColor; vertical-align: middle; }

/* ── Hero module preview cards ───────────────────────────────────── */
.hero-modules { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.hero-mod-card {
  background: rgba(255, 255, 255, 0.10);
  border: 1px solid rgba(255, 255, 255, 0.20);
  border-radius: var(--r);
  padding: 18px 18px 16px;
  cursor: pointer;
  transition: transform 0.2s var(--ease), background 0.2s, box-shadow 0.2s;
  display: flex;
  flex-direction: column;
  gap: 10px;
  text-decoration: none;
  color: #fff;
}
.hero-mod-card:hover { transform: translateY(-2px); background: rgba(255, 255, 255, 0.18); box-shadow: var(--shadow-card); }
.hero-mod-card:focus-visible { outline: 2px solid #fff; outline-offset: 3px; }
.hero-mod-card .mod-icon { width: 36px; height: 36px; }
.hero-mod-card .mod-name { font-family: var(--font-display); font-size: 0.82rem; font-weight: 700; line-height: 1.2; }
.hero-mod-card .mod-count { font-family: var(--font-mono); font-size: 0.68rem; letter-spacing: 0.08em; color: rgba(255, 255, 255, 0.6); text-transform: uppercase; }

/* ═══════════════════════════ BUTTONS ═══════════════════════════════ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 11px 22px;
  border-radius: var(--r-sm);
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: opacity 0.18s, transform 0.18s var(--ease), box-shadow 0.18s, background 0.18s;
  text-decoration: none;
  line-height: 1;
}
.btn:focus-visible { outline: 2px solid var(--c-accent); outline-offset: 3px; }
.btn:active { transform: scale(0.97); }
.btn-primary { background: var(--c-accent); color: #fff; box-shadow: 0 4px 20px -6px var(--c-accent-glow); }
.btn-primary:hover { opacity: 0.9; }
.btn-ghost { background: transparent; color: var(--c-fg); border: 1px solid var(--c-line); }
.btn-ghost:hover { background: var(--c-600); border-color: var(--c-dim); }
.btn-sm { padding: 7px 14px; font-size: 0.82rem; }
/* On the dark hero, invert */
.hero .btn-primary { background: #fff; color: var(--c-heading); }
.hero .btn-ghost { color: #fff; border-color: rgba(255, 255, 255, 0.45); }
.hero .btn-ghost:hover { background: rgba(255, 255, 255, 0.12); }

/* Inline link with arrow */
.link {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--c-accent);
  transition: gap 0.2s;
  white-space: nowrap;
}
.link:hover { gap: 8px; }

/* ═══════════════════════════ SECTION HEAD ══════════════════════════ */
.shead {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
  margin-bottom: 36px;
}
.shead > div { max-width: 640px; }
.shead p { color: var(--c-dim); margin: 10px 0 0; }

/* ═══════════════════════════ BADGES ════════════════════════════════ */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  min-width: 0;
  max-width: 100%;
  font-family: var(--font-mono);
  font-size: 0.63rem;
  letter-spacing: 0.04em;
  padding: 3px 7px;
  border-radius: 4px;
  white-space: nowrap;
  border: 1px solid transparent;
  text-transform: uppercase;
  font-weight: 600;
  overflow: hidden;
  text-overflow: ellipsis;
}
.badge-difficulty-beginner     { background: rgba(74, 222, 128, 0.12); color: var(--c-beginner); border-color: rgba(74, 222, 128, 0.2); }
.badge-difficulty-intermediate { background: rgba(250, 204, 21, 0.12); color: var(--c-intermediate); border-color: rgba(250, 204, 21, 0.2); }
.badge-difficulty-advanced     { background: rgba(248, 113, 113, 0.12); color: var(--c-advanced); border-color: rgba(248, 113, 113, 0.2); }
.badge-duration { background: var(--c-700); color: var(--c-dim); border-color: var(--c-line); }
.badge-tag {
  background: var(--c-600);
  color: var(--c-faint);
  border-color: transparent;
  font-weight: 400;
  letter-spacing: 0;
  text-transform: none;
  font-size: 0.68rem;
}
.badge-tag:hover { color: var(--c-dim); }

/* ═══════════════════════════ STEPS ═════════════════════════════════ */
.steps-grid {
  display: grid;
  gap: 0;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 240px), 1fr));
  border: 1px solid var(--c-line);
  border-radius: var(--r);
  overflow: hidden;
  margin-top: 36px;
  background: var(--c-800);
}
.step-item { padding: 24px 24px 22px; border-right: 1px solid var(--c-line); position: relative; }
.step-item:last-child { border-right: none; }
@media (max-width: 767px) {
  .step-item { border-right: none; border-bottom: 1px solid var(--c-line); }
  .step-item:last-child { border-bottom: none; }
}
.step-num, .obj-num {
  font-family: var(--font-display);
  font-size: 2.4rem;
  font-weight: 800;
  letter-spacing: -0.04em;
  color: var(--c-line-soft);
  line-height: 1;
  margin-bottom: 12px;
}
.step-title { font-family: var(--font-display); font-weight: 700; font-size: 0.95rem; margin-bottom: 8px; color: var(--c-heading); }
.step-desc { font-size: 0.82rem; color: var(--c-dim); line-height: 1.65; }

/* ═══════════════════════════ CARD ══════════════════════════════════ */
.card, .rvap-card {
  background: var(--c-800);
  border: 1px solid var(--c-line);
  border-radius: var(--r-lg);
  padding: 24px;
  box-shadow: var(--shadow-card);
}

/* ═══════════════════════════ FOOTER ════════════════════════════════ */
.footer { border-top: 1px solid var(--c-line); padding: 36px 0; margin-top: auto; background: var(--c-800); }
.footer-inner { display: flex; align-items: center; gap: 20px; flex-wrap: wrap; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
@media (min-width: 768px) { .footer-inner { padding: 0 40px; } }
.footer p { margin: 0; font-size: 0.78rem; color: var(--c-faint); flex: 1; min-width: 200px; line-height: 1.6; }
.footer-links { display: flex; gap: 16px; flex-wrap: wrap; }
.footer-links a { font-size: 0.78rem; color: var(--c-faint); transition: color 0.15s; }
.footer-links a:hover { color: var(--c-accent); }

/* ═══════════════════════════ REVEAL ════════════════════════════════ */
.reveal { opacity: 0; transform: translateY(16px); transition: opacity 0.6s var(--ease), transform 0.6s var(--ease); }
.reveal.visible { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) { .reveal { opacity: 1; transform: none; transition: none; } }

/* ═══════════════════════════ A11Y ══════════════════════════════════ */
:where(a, button, [tabindex]):focus-visible { outline: 2px solid var(--c-accent); outline-offset: 2px; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }