:root {
  --ink: #161719;
  --paper: #fffdf8;
  --blue: #2f6fcb;
  --blue-glow: rgba(47, 111, 203, 0.32);
  --shadow: rgba(23, 27, 35, 0.2);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html,
body {
  width: 100%;
  height: 100%;
  min-height: 100%;
}

body {
  overflow: hidden;
  background: linear-gradient(135deg, #f8f9fb 0%, #eceff3 48%, #d9dde4 100%);
  color: var(--ink);
  font-family: "Inter", "Aptos", "Segoe UI Variable Text", "Segoe UI", sans-serif;
}

.nova-hero-page,
.nova-hero-shell {
  width: 100%;
  height: 100%;
  min-height: 100vh;
  overflow: hidden;
}

.nova-hero-shell {
  position: relative;
  background:
    linear-gradient(110deg, rgba(255, 255, 255, 0.96), rgba(255, 255, 255, 0.62) 42%, rgba(229, 234, 241, 0.76)),
    linear-gradient(180deg, rgba(47, 111, 203, 0.08), transparent 62%);
}

.nova-hero-shell::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(22, 23, 25, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(22, 23, 25, 0.03) 1px, transparent 1px);
  background-size: clamp(24px, 3vw, 42px) clamp(24px, 3vw, 42px);
  mask-image: radial-gradient(circle at 56% 48%, rgba(0, 0, 0, 0.44), transparent 74%);
  pointer-events: none;
}

.viewer-diagram {
  --tilt-x: 0deg;
  --tilt-y: 0deg;
  position: absolute;
  inset: clamp(16px, 2vw, 28px);
  perspective: 1400px;
  transform-style: preserve-3d;
}

.diagram-glow {
  position: absolute;
  inset: 3% 2% 0 3%;
  border-radius: 46px;
  background:
    radial-gradient(circle at 68% 28%, rgba(47, 111, 203, 0.18), transparent 32%),
    radial-gradient(circle at 28% 74%, rgba(143, 160, 184, 0.24), transparent 32%);
  filter: blur(14px);
}

.diagram-layer {
  position: absolute;
  transform-style: preserve-3d;
  transition: transform 360ms ease, filter 360ms ease;
}

.diagram-layer.is-active-layer {
  filter: drop-shadow(0 14px 24px var(--blue-glow));
}

.reader-layer {
  z-index: 2;
  left: 3%;
  top: 9%;
  width: 69%;
  height: 80%;
  transform: rotateX(var(--tilt-x)) rotateY(calc(var(--tilt-y) - 3deg)) translateZ(0);
}

.reader-window {
  width: 100%;
  height: 100%;
  overflow: hidden;
  border: 1px solid rgba(22, 23, 25, 0.12);
  border-radius: clamp(18px, 2.2vw, 32px);
  background: rgba(255, 255, 255, 0.78);
  box-shadow: 0 30px 78px var(--shadow), inset 0 1px 0 rgba(255, 255, 255, 0.86);
}

.reader-topbar {
  height: clamp(34px, 4.2vw, 58px);
  display: flex;
  align-items: center;
  gap: clamp(7px, 0.8vw, 12px);
  padding: 0 clamp(14px, 1.5vw, 24px);
  border-bottom: 1px solid rgba(22, 23, 25, 0.09);
  background: rgba(255, 255, 255, 0.78);
}

.reader-topbar span {
  width: clamp(8px, 0.9vw, 11px);
  height: clamp(8px, 0.9vw, 11px);
  border-radius: 50%;
}

.reader-topbar span:nth-child(1) { background: #4775cf; }
.reader-topbar span:nth-child(2) { background: #ee7d29; }
.reader-topbar span:nth-child(3) { background: #6caf46; }

.reader-body {
  height: calc(100% - clamp(34px, 4.2vw, 58px));
  display: grid;
  grid-template-columns: clamp(48px, 6vw, 88px) minmax(0, 1fr);
  gap: clamp(10px, 1.2vw, 18px);
  padding: clamp(12px, 1.6vw, 22px);
}

.thumbnail-rail {
  display: grid;
  align-content: start;
  gap: clamp(7px, 0.9vw, 12px);
}

.thumb {
  display: block;
  aspect-ratio: 0.72;
  border-radius: clamp(7px, 0.8vw, 12px);
  border: 1px solid rgba(22, 23, 25, 0.1);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.96), rgba(229, 234, 241, 0.9));
}

.thumb.is-active {
  border-color: rgba(47, 111, 203, 0.6);
  box-shadow: 0 0 0 2px rgba(47, 111, 203, 0.14), 0 0 18px rgba(47, 111, 203, 0.16);
}

.pdf-page-stage {
  position: relative;
  display: grid;
  place-items: center;
  overflow: hidden;
  border-radius: clamp(14px, 1.5vw, 22px);
  background: linear-gradient(145deg, rgba(229, 234, 241, 0.82), rgba(205, 212, 222, 0.72));
}

.pdf-page-stage::before {
  content: "";
  position: absolute;
  width: 72%;
  height: 78%;
  border-radius: 16px;
  background: rgba(0, 0, 0, 0.13);
  filter: blur(18px);
  transform: translate(10px, 14px);
}

.pdf-page-canvas,
.pdf-page-fallback {
  position: relative;
  z-index: 1;
  width: min(76%, 760px);
  max-height: 90%;
  border-radius: 9px;
  background: var(--paper);
  box-shadow: 0 18px 44px rgba(22, 23, 25, 0.16);
}

.pdf-page-canvas {
  height: auto;
  display: block;
}

.pdf-page-canvas.is-loaded + .pdf-page-fallback {
  display: none;
}

.pdf-page-fallback {
  display: grid;
  gap: 9px;
  padding: clamp(20px, 2vw, 30px);
}

.pdf-page-fallback p {
  color: var(--blue);
  font-size: clamp(0.72rem, 0.82vw, 0.92rem);
  font-weight: 800;
}

.pdf-page-fallback h2 {
  max-width: 13ch;
  font-size: clamp(1.25rem, 2vw, 2.6rem);
  line-height: 1;
}

.pdf-page-fallback span {
  display: block;
  height: 7px;
  border-radius: 999px;
  background: rgba(22, 23, 25, 0.12);
}

.navigation-layer {
  z-index: 3;
  right: 2%;
  top: 4%;
  width: min(41%, 540px);
  transform: rotateX(calc(var(--tilt-x) * 0.42)) rotateY(calc(var(--tilt-y) + 4deg)) translateZ(86px);
  animation: float-nav 7s ease-in-out infinite;
}

.navigation-layer img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: clamp(18px, 2.1vw, 30px);
  box-shadow: 0 26px 64px rgba(22, 23, 25, 0.2), 0 0 0 1px rgba(22, 23, 25, 0.06);
}

@keyframes float-nav {
  0%, 100% { translate: 0 0; }
  50% { translate: 0 -6px; }
}

@media (max-width: 740px) {
  .reader-layer {
    left: 3%;
    top: 16%;
    width: 74%;
    height: 70%;
  }

  .navigation-layer {
    right: 1%;
    top: 9%;
    width: 44%;
  }

  .thumbnail-rail {
    display: none;
  }

  .reader-body {
    grid-template-columns: 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}