/* ══════════════════════════════════════════════════
   SUB-PAGES (SPA navigation)
══════════════════════════════════════════════════ */
.landing-page.is-hidden { display: none; }
.subpage { display: none; }
.subpage.is-active { display: block; }

/* ══════════════════════════════════════════════════
   PAGE HERO (sub-pages header)
══════════════════════════════════════════════════ */
.page-hero {
  padding: calc(var(--nav-h) + 80px) 0 56px;
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(ellipse 80% 60% at 50% 0%, rgba(139,92,246,.08), transparent 60%),
    radial-gradient(ellipse 60% 50% at 100% 20%, rgba(96,165,250,.06), transparent 50%);
  border-bottom: 1px solid var(--border);
}
.page-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,.015) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.015) 1px, transparent 1px);
  background-size: 56px 56px;
  -webkit-mask-image: radial-gradient(ellipse 60% 50% at 50% 50%, black 30%, transparent 80%);
          mask-image: radial-gradient(ellipse 60% 50% at 50% 50%, black 30%, transparent 80%);
  pointer-events: none;
}
.page-hero-inner {
  max-width: 820px;
  margin: 0 auto;
  text-align: center;
  position: relative;
  z-index: 1;
}
.page-hero-inner .eyebrow { margin-bottom: 20px; }
.page-hero-inner h1 {
  font-size: clamp(2.25rem, 5vw, 3.75rem);
  font-weight: var(--h-weight-strong);   /* 700 */
  line-height: 1.1;
  letter-spacing: -.02em;
  margin-bottom: 20px;
  background: linear-gradient(180deg, #FFFFFF 0%, rgba(255,255,255,.7) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.page-hero-subtitle {
  font-size: 1.125rem;
  color: var(--text-dim);
  line-height: 1.6;
  max-width: 620px;
  margin: 0 auto;
}

/* PAGE CONTENT WRAPPER */
.page-content { padding: 80px 0 120px; }

/* PLACEHOLDER (Coming Soon) */
.page-placeholder {
  max-width: 560px;
  margin: 0 auto;
  text-align: center;
  padding: 64px 32px;
  background: var(--bg-card);
  border: 1px solid var(--border-m);
  border-radius: var(--radius);
  position: relative;
  overflow: hidden;
}
.page-placeholder::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: var(--grad-text);
  opacity: .5;
}
.page-placeholder-icon {
  width: 72px; height: 72px;
  margin: 0 auto 28px;
  border-radius: 18px;
  background: var(--purple-glow);
  border: 1px solid rgba(139,92,246,.2);
  display: grid;
  place-items: center;
  color: var(--purple-l);
}
.page-placeholder-icon svg { width: 32px; height: 32px; }
.page-placeholder h2 {
  font-size: 1.75rem;
  font-weight: var(--h-weight-default);   /* 600 */
  letter-spacing: -.01em;
  margin-bottom: 12px;
  color: var(--text);
}
.page-placeholder p {
  font-size: 1rem;
  color: var(--text-dim);
  line-height: 1.7;
  margin-bottom: 32px;
}
.page-placeholder .btn {
  display: inline-flex;
  gap: 8px;
  align-items: center;
}

/* Active nav indicator */
.nav a[data-page].is-active-tab {
  color: var(--text);
}
.nav a[data-page].is-active-tab::after {
  content: '';
  position: absolute;
  bottom: -6px;
  left: 0; right: 0;
  height: 2px;
  background: var(--grad-text);
  border-radius: 1px;
}

@media (max-width: 768px) {
  .page-hero { padding: calc(var(--nav-h) + 56px) 0 40px; }
  .page-content { padding: 56px 0 80px; }
  .page-placeholder { padding: 48px 24px; }
}
@media (max-width: 480px) {
  .page-hero-inner h1 { font-size: 2rem; }
  .page-hero-subtitle { font-size: 1rem; }
  .page-placeholder h2 { font-size: 1.5rem; }
}