/**
 * SANSA AI — Rich motion + classic multi-color borders (index-classic hub)
 * Light backgrounds stay white; gradient borders + subtle animation only.
 */

:root {
  --sansa-classic-gradient: linear-gradient(
    135deg,
    #ff6b00 0%,
    #ff3d00 18%,
    #7c3aed 45%,
    #2563eb 72%,
    #10b981 88%,
    #ff6b00 100%
  );
  --sansa-motion-ease: cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes sansaHeroCard {
  0%, 100% {
    transform: translateY(0);
    background-position: 0 0, 0% 50%;
  }
  50% {
    transform: translateY(-10px);
    background-position: 0 0, 100% 50%;
  }
}

@keyframes sansaBorderShift {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

@keyframes sansaFadeUp {
  from {
    opacity: 0;
    transform: translateY(28px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes sansaFloatSoft {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  50% { transform: translateY(-10px) rotate(1deg); }
}

@keyframes sansaShimmer {
  0% { background-position: -200% center; }
  100% { background-position: 200% center; }
}

@keyframes sansaGlowPulse {
  0%, 100% { box-shadow: 0 4px 20px rgba(37, 99, 235, 0.18); }
  50% { box-shadow: 0 8px 32px rgba(124, 58, 237, 0.28); }
}

/* ── Promo bar shimmer ── */
body.sansa-rich .promo-bar {
  position: relative;
  overflow: hidden;
}

body.sansa-rich .promo-bar::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    105deg,
    transparent 35%,
    rgba(255, 255, 255, 0.22) 50%,
    transparent 65%
  );
  background-size: 200% 100%;
  animation: sansaShimmer 7s ease-in-out infinite;
  pointer-events: none;
}

/* ── Header rainbow underline ── */
body.sansa-rich .site-header {
  position: sticky;
}

body.sansa-rich .site-header::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background: var(--sansa-classic-gradient);
  background-size: 300% 100%;
  animation: sansaBorderShift 10s linear infinite;
}

/* ── Sidebar accent strip ── */
body.sansa-rich .os-sidebar {
  position: relative;
}

body.sansa-rich .os-sidebar::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 3px;
  height: 100%;
  background: var(--sansa-classic-gradient);
  background-size: 100% 300%;
  animation: sansaBorderShift 12s linear infinite;
  opacity: 0.85;
}

/* ── Classic multi-color border cards ── */
body.sansa-rich .studio-card,
body.sansa-rich .story-card,
body.sansa-rich .wt-card,
body.sansa-rich .app-card,
body.sansa-rich .plan-card,
body.sansa-rich .pdf-panel,
body.sansa-rich .os-search-panel {
  border: 2px solid transparent !important;
  background-size: 100% 100%, 320% 320% !important;
  animation: sansaBorderShift 14s linear infinite;
  transition: transform 0.35s var(--sansa-motion-ease), box-shadow 0.35s var(--sansa-motion-ease) !important;
}

body.sansa-rich .studio-card,
body.sansa-rich .story-card,
body.sansa-rich .app-card,
body.sansa-rich .plan-card,
body.sansa-rich .pdf-panel,
body.sansa-rich .os-search-panel {
  background:
    linear-gradient(#ffffff, #ffffff) padding-box,
    var(--sansa-classic-gradient) border-box !important;
}

body.sansa-rich .story-card.yellow {
  background:
    linear-gradient(#fffbeb, #fff8dc) padding-box,
    var(--sansa-classic-gradient) border-box !important;
}

body.sansa-rich .story-card.blue {
  background:
    linear-gradient(#eff6ff, #ede9fe) padding-box,
    var(--sansa-classic-gradient) border-box !important;
}

body.sansa-rich .wt-card {
  background:
    linear-gradient(#ffffff, #ffffff) padding-box,
    var(--sansa-classic-gradient) border-box !important;
}

body.sansa-rich .wt-card-accent {
  background:
    linear-gradient(#fffbeb, #fff7ed) padding-box,
    var(--sansa-classic-gradient) border-box !important;
}

body.sansa-rich .studio-card:hover,
body.sansa-rich .story-card:hover,
body.sansa-rich .wt-card:hover,
body.sansa-rich .app-card:hover,
body.sansa-rich .plan-card:hover {
  transform: translateY(-6px) scale(1.01);
  box-shadow: 0 16px 40px rgba(15, 23, 42, 0.12) !important;
}

/* ── Tool grid chips ── */
body.sansa-rich .tool-grid span {
  border: 1.5px solid transparent !important;
  background:
    linear-gradient(#f8fafc, #f8fafc) padding-box,
    var(--sansa-classic-gradient) border-box !important;
  background-size: 100% 100%, 280% 280% !important;
  animation: sansaBorderShift 16s linear infinite;
  transition: transform 0.25s var(--sansa-motion-ease) !important;
}

body.sansa-rich .tool-grid span:hover {
  transform: translateY(-2px);
}

/* ── Badges & chips ── */
body.sansa-rich .home-badge,
body.sansa-rich .home-feature-chip {
  border: 1.5px solid transparent !important;
  background:
    linear-gradient(#f8fafc, #ffffff) padding-box,
    var(--sansa-classic-gradient) border-box !important;
  background-size: 100% 100%, 260% 260% !important;
  animation: sansaBorderShift 12s linear infinite;
}

body.sansa-rich .home-badge-accent {
  background:
    linear-gradient(#fff7ed, #fffbeb) padding-box,
    var(--sansa-classic-gradient) border-box !important;
}

/* ── PDF tabs ── */
body.sansa-rich .pdf-tab {
  border: 1.5px solid transparent !important;
  background:
    linear-gradient(#f8fafc, #f8fafc) padding-box,
    var(--sansa-classic-gradient) border-box !important;
  background-size: 100% 100%, 240% 240% !important;
  transition: transform 0.2s ease !important;
}

body.sansa-rich .pdf-tab.active {
  background:
    linear-gradient(#eff6ff, #eef2ff) padding-box,
    var(--sansa-classic-gradient) border-box !important;
  animation: sansaBorderShift 8s linear infinite;
}

body.sansa-rich .pdf-tab:hover {
  transform: translateY(-1px);
}

body.sansa-rich .pdf-dropzone {
  border: 2px dashed transparent !important;
  background:
    linear-gradient(#f8fafc, #f8fafc) padding-box,
    var(--sansa-classic-gradient) border-box !important;
  background-size: 100% 100%, 300% 300% !important;
  animation: sansaBorderShift 12s linear infinite;
}

/* ── Hero entrance ── */
body.sansa-rich .hero-copy {
  animation: sansaFadeUp 0.85s var(--sansa-motion-ease) both;
}

body.sansa-rich .hero-art {
  animation: sansaFadeUp 0.85s var(--sansa-motion-ease) 0.12s both;
}

body.sansa-rich .studio-card {
  animation: sansaHeroCard 14s ease-in-out infinite !important;
}

body.sansa-rich .shape-panel {
  animation: sansaFloatSoft 5.5s ease-in-out infinite !important;
}

body.sansa-rich .panel-blue {
  animation-delay: 0.4s !important;
}

body.sansa-rich .panel-yellow {
  animation-delay: 0.8s !important;
}

/* ── Primary CTA glow ── */
body.sansa-rich .primary-button {
  animation: sansaGlowPulse 3.5s ease-in-out infinite;
}

/* ── Nav link hover underline ── */
body.sansa-rich .top-nav .nav-link {
  position: relative;
}

body.sansa-rich.sansa-os .top-nav .nav-link::after {
  display: block !important;
  content: "" !important;
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 6px;
  height: 2px;
  margin-left: 0;
  font-size: 0;
  background: var(--sansa-classic-gradient);
  background-size: 200% 100%;
  transform: scaleX(0);
  transform-origin: center;
  transition: transform 0.3s var(--sansa-motion-ease);
  border-radius: 2px;
}

body.sansa-rich .top-nav .nav-link:hover::after,
body.sansa-rich .top-nav .nav-link.active::after {
  transform: scaleX(1);
  animation: sansaBorderShift 6s linear infinite;
}

/* ── Scroll reveal ── */
body.sansa-rich .sansa-reveal {
  opacity: 0;
  transform: translateY(26px);
  transition:
    opacity 0.65s var(--sansa-motion-ease),
    transform 0.65s var(--sansa-motion-ease);
}

body.sansa-rich .sansa-reveal.is-visible {
  opacity: 1;
  transform: none;
}

body.sansa-rich .sansa-reveal-stagger.is-visible:nth-child(1) { transition-delay: 0ms; }
body.sansa-rich .sansa-reveal-stagger.is-visible:nth-child(2) { transition-delay: 70ms; }
body.sansa-rich .sansa-reveal-stagger.is-visible:nth-child(3) { transition-delay: 140ms; }
body.sansa-rich .sansa-reveal-stagger.is-visible:nth-child(4) { transition-delay: 210ms; }
body.sansa-rich .sansa-reveal-stagger.is-visible:nth-child(5) { transition-delay: 280ms; }
body.sansa-rich .sansa-reveal-stagger.is-visible:nth-child(6) { transition-delay: 350ms; }

/* ── Section headings accent ── */
body.sansa-rich .section-heading h2 {
  position: relative;
  display: inline-block;
}

body.sansa-rich .section-heading h2::after {
  content: "";
  display: block;
  height: 3px;
  width: 72px;
  margin-top: 8px;
  border-radius: 999px;
  background: var(--sansa-classic-gradient);
  background-size: 200% 100%;
  animation: sansaBorderShift 8s linear infinite;
}

body.sansa-rich .home-section-head h2::after {
  content: "";
  display: block;
  height: 3px;
  width: 64px;
  margin: 8px auto 0;
  border-radius: 999px;
  background: var(--sansa-classic-gradient);
  background-size: 200% 100%;
  animation: sansaBorderShift 8s linear infinite;
}

/* ── App switcher / search panel polish ── */
body.sansa-rich .app-switcher {
  border: 2px solid transparent !important;
  background:
    linear-gradient(#ffffff, #ffffff) padding-box,
    var(--sansa-classic-gradient) border-box !important;
  background-size: 100% 100%, 300% 300% !important;
  animation: sansaBorderShift 12s linear infinite, sansaFadeUp 0.35s var(--sansa-motion-ease) both;
}

body.sansa-rich .os-search-modal:not(.hidden) .os-search-panel {
  animation: sansaFadeUp 0.35s var(--sansa-motion-ease) both;
}

@media (prefers-reduced-motion: reduce) {
  body.sansa-rich *,
  body.sansa-rich *::before,
  body.sansa-rich *::after {
    animation: none !important;
    transition: none !important;
  }

  body.sansa-rich .sansa-reveal {
    opacity: 1;
    transform: none;
  }
}