/* ============================================================
   hub-shared.css — Shared styles for Playbook hub pages
   ============================================================ */

/* === Reset === */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }
body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img { max-width: 100%; height: auto; display: block; }
a { text-decoration: none; transition: color 0.2s ease; }
a:focus-visible { outline: 2px solid var(--pb-color-secondary); outline-offset: 2px; border-radius: 4px; }

/* === Back Bar === */
.pb-back-bar {
  background: var(--pb-color-primary-dark, #0F1923);
  padding: 14px 40px;
}
.pb-back-bar a {
  color: rgba(255,255,255,0.55);
  font-family: var(--pb-font-heading, 'Inter', sans-serif);
  font-size: 13px;
  font-weight: 500;
  text-decoration: underline;
  transition: color 0.2s;
}
.pb-back-bar a:hover { color: rgba(255,255,255,0.9); }

/* === Container === */
.pb-container { max-width: 1200px; margin: 0 auto; padding: 0 40px; }

/* === Gradient Accent Divider === */
.pb-gradient-line {
  display: block;
  width: 80px;
  height: 2px;
  background: linear-gradient(90deg, var(--pb-color-secondary), var(--pb-color-accent));
  margin: 0 auto;
  border-radius: 1px;
}
.pb-section > .pb-gradient-line,
.pb-section-alt > .pb-gradient-line {
  margin-top: 0;
  margin-bottom: 0;
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
}

/* === Section Layout === */
.pb-section { padding: 120px 0; position: relative; }
.pb-section-alt { padding: 120px 0; background: var(--pb-color-neutral-50); position: relative; }
.pb-section-label {
  font-family: var(--pb-font-heading);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--pb-color-secondary);
  margin-bottom: 12px;
  text-align: center;
}
.pb-section-heading {
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  font-weight: 800;
  margin-bottom: 16px;
  color: var(--pb-color-primary);
  letter-spacing: -0.02em;
  text-align: center;
}
.pb-section-desc {
  font-size: var(--pb-text-body-lg);
  color: var(--pb-color-neutral-700);
  max-width: 640px;
  margin-bottom: 48px;
  line-height: 1.7;
  text-align: center;
  margin-left: auto;
  margin-right: auto;
}

/* === Scroll Reveal System === */
.pb-reveal {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}
.pb-reveal.revealed {
  opacity: 1;
  transform: translateY(0);
}
.pb-reveal-stagger {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
  transition-delay: calc(var(--i, 0) * 100ms);
}
.pb-reveal-stagger.revealed {
  opacity: 1;
  transform: translateY(0);
}

/* === Hero Base === */
.pb-hero {
  background: linear-gradient(-45deg, #0F1923, #1B2838, #2A3F56, #1B2838, #0F1923, #1B2838);
  background-size: 400% 400%;
  animation: pb-gradient-shift 20s ease infinite;
  color: #fff;
  padding: 120px 0 100px;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.pb-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 600px 400px at 20% 50%, rgba(0,212,170,0.08) 0%, transparent 70%),
    radial-gradient(ellipse 500px 350px at 80% 30%, rgba(255,107,53,0.05) 0%, transparent 70%);
  pointer-events: none;
}
@keyframes pb-gradient-shift {
  0% { background-position: 0% 50%; }
  25% { background-position: 50% 100%; }
  50% { background-position: 100% 50%; }
  75% { background-position: 50% 0%; }
  100% { background-position: 0% 50%; }
}
.pb-hero h2 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 20px;
  color: #fff;
  line-height: 1.1;
}
.pb-hero .pb-hero-sub {
  font-size: 1.2rem;
  color: rgba(255,255,255,0.65);
  max-width: 600px;
  margin: 0 auto 56px;
  line-height: 1.7;
}

/* === Footer Strip === */
.pb-footer {
  text-align: center;
  padding: 28px 0;
  font-size: 0.82rem;
  color: var(--pb-color-neutral-500);
}
.pb-footer a { text-decoration: underline; }

/* === Responsive: Shared Elements === */
@media (max-width: 768px) {
  .pb-back-bar { padding: 12px 20px; }
  .pb-container { padding: 0 24px; }
  .pb-section, .pb-section-alt { padding: 72px 0; }
  .pb-hero { padding: 72px 0 56px; }
}

/* === Reduced Motion === */
@media (prefers-reduced-motion: reduce) {
  .pb-hero { animation: none; }
  .pb-reveal, .pb-reveal-stagger {
    opacity: 1;
    transform: none;
    transition: none;
  }
  html { scroll-behavior: auto; }
}