/* =========================================================
   THE PLANE ANALOGY, Scroll-Driven Graphic Novel
   Scope: .pa-*
   ========================================================= */

/* ---------- Body & Canvas ---------- */
.pa-body {
  background: #0B1628;
  overflow-x: hidden;
}

.pa-body .site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  transition: opacity 0.4s ease;
}

.pa-phase-dark .site-header,
.pa-phase-alarm .site-header,
.pa-phase-fog .site-header,
.pa-phase-void .site-header {
  background: rgba(11, 22, 40, 0.85);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.pa-phase-resolve .site-header {
  background: rgba(247, 242, 228, 0.92);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.pa-phase-dark .wordmark a,
.pa-phase-alarm .wordmark a,
.pa-phase-fog .wordmark a,
.pa-phase-void .wordmark a {
  color: rgba(255, 255, 255, 0.9);
}

.pa-phase-dark .wordmark-glyph,
.pa-phase-alarm .wordmark-glyph,
.pa-phase-fog .wordmark-glyph,
.pa-phase-void .wordmark-glyph {
  filter: brightness(3);
}

.pa-phase-dark .header-cta,
.pa-phase-alarm .header-cta,
.pa-phase-fog .header-cta,
.pa-phase-void .header-cta {
  color: var(--honey, #E8B547);
  border-color: var(--honey, #E8B547);
}

.pa-phase-resolve .wordmark a,
.pa-phase-resolve .header-cta {
  color: var(--ink);
}

.pa-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 1;
  pointer-events: none;
}

.pa-main {
  position: relative;
  z-index: 2;
}

/* ---------- Scene Layout ---------- */
.pa-scene {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

/* ---------- Panel Backgrounds ---------- */
.pa-panel-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  background: #0B1628;
}

.pa-panel-bg-light {
  background: var(--bg);
}

.pa-panel-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  will-change: transform;
}

.pa-overlay {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.pa-overlay-dark {
  background: linear-gradient(
    180deg,
    rgba(11, 22, 40, 0.65) 0%,
    rgba(11, 22, 40, 0.35) 40%,
    rgba(11, 22, 40, 0.85) 100%
  );
}

.pa-overlay-warm {
  background: linear-gradient(
    180deg,
    rgba(26, 20, 32, 0.5) 0%,
    rgba(139, 67, 19, 0.15) 50%,
    rgba(26, 20, 32, 0.7) 100%
  );
}

.pa-overlay-alarm {
  background: rgba(139, 44, 27, 0.15);
  box-shadow: inset 0 0 120px rgba(139, 44, 27, 0.3);
  animation: pa-alarm-pulse 1.6s ease-in-out infinite alternate;
}

.pa-overlay-fog {
  background:
    radial-gradient(ellipse at 20% 30%, rgba(255,255,255,0.06) 0%, transparent 50%),
    radial-gradient(ellipse at 70% 60%, rgba(255,255,255,0.04) 0%, transparent 40%),
    linear-gradient(180deg, rgba(42, 44, 48, 0.6) 0%, rgba(42, 44, 48, 0.8) 100%);
}

.pa-overlay-split {
  background: linear-gradient(
    180deg,
    rgba(11, 22, 40, 0.7) 0%,
    rgba(11, 22, 40, 0.3) 40%,
    rgba(232, 181, 71, 0.1) 70%,
    rgba(232, 181, 71, 0.2) 100%
  );
}

.pa-overlay-void {
  background: radial-gradient(
    circle at 50% 50%,
    transparent 5%,
    rgba(0, 0, 0, 0.4) 30%,
    rgba(0, 0, 0, 0.75) 60%,
    rgba(0, 0, 0, 0.95) 100%
  );
}

.pa-overlay-dawn {
  background: linear-gradient(
    180deg,
    rgba(247, 242, 228, 0.3) 0%,
    rgba(247, 242, 228, 0.6) 40%,
    rgba(247, 242, 228, 0.85) 100%
  );
}

/* ---------- Text Layer ---------- */
.pa-text-layer {
  position: relative;
  z-index: 5;
  max-width: 820px;
  padding: 40px 24px;
  text-align: center;
  background: linear-gradient(
    180deg,
    rgba(11, 22, 40, 0.0) 0%,
    rgba(11, 22, 40, 0.25) 15%,
    rgba(11, 22, 40, 0.4) 50%,
    rgba(11, 22, 40, 0.25) 85%,
    rgba(11, 22, 40, 0.0) 100%
  );
  border-radius: 24px;
  backdrop-filter: blur(2px);
  -webkit-backdrop-filter: blur(2px);
}

.pa-text-resolve {
  background: none;
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
}

.pa-line {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.6s ease, transform 0.6s ease;
  margin: 0 0 16px;
}

.pa-line.pa-visible {
  opacity: 1;
  transform: translateY(0);
}

.pa-line-main {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(28px, 5vw, 52px);
  line-height: var(--lh-tight);
  color: #fff;
  text-shadow: 0 2px 8px rgba(0, 0, 0, 0.7), 0 0 40px rgba(0, 0, 0, 0.5);
}

.pa-line-accent {
  font-family: var(--font-serif);
  font-weight: 700;
  font-style: italic;
  font-size: clamp(24px, 4.5vw, 44px);
  line-height: var(--lh-tight);
  color: var(--accent-2);
  text-shadow: 0 2px 8px rgba(0, 0, 0, 0.7), 0 0 40px rgba(0, 0, 0, 0.5);
}

.pa-line-large {
  font-size: clamp(32px, 6vw, 64px);
}

.pa-line-detail {
  font-family: var(--font-sans);
  font-weight: 400;
  font-size: clamp(16px, 2.5vw, 22px);
  line-height: 1.5;
  color: rgba(255, 255, 255, 0.85);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
  text-shadow: 0 2px 6px rgba(0, 0, 0, 0.6), 0 0 30px rgba(0, 0, 0, 0.4);
}

.pa-line-fade {
  transition: opacity 0.8s ease, transform 0.8s ease, font-size 1s ease;
}

.pa-line-dread {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(20px, 3.5vw, 36px);
  line-height: var(--lh-snug);
  color: rgba(255, 255, 255, 0.7);
  text-shadow: 0 2px 8px rgba(0, 0, 0, 0.7), 0 0 40px rgba(0, 0, 0, 0.5);
}

.pa-line-final {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(22px, 3.5vw, 36px);
  line-height: var(--lh-tight);
  color: #E8945A;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.8), 0 0 50px rgba(0, 0, 0, 0.6);
}

.pa-line-grow {
  font-size: clamp(28px, 5.5vw, 56px);
}

/* Scene 4: SLAM words */
.pa-word-slam {
  display: inline-block;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--danger);
  font-weight: 800;
}

/* Scene 8: Resolve */
.pa-scene-resolve {
  background: var(--bg);
  min-height: 100vh;
}

.pa-text-resolve {
  padding-top: 80px;
  padding-bottom: 80px;
}

.pa-line-hero {
  font-family: var(--font-serif);
  font-weight: 800;
  font-size: clamp(32px, 7vw, 72px);
  line-height: var(--lh-tight);
  color: var(--ink);
  margin-bottom: 24px;
}

.pa-line-sub {
  font-family: var(--font-sans);
  font-weight: 400;
  font-size: clamp(16px, 2.5vw, 20px);
  line-height: 1.6;
  color: var(--ink-dim);
  max-width: 600px;
  margin: 0 auto 40px;
}

/* ---------- CTA Block ---------- */
.pa-cta-block {
  margin: 40px auto;
  text-align: center;
}

.pa-btn-primary {
  display: inline-block;
  padding: 16px 40px;
  background: var(--accent-2);
  color: var(--bg-light);
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 18px;
  text-decoration: none;
  border-radius: 6px;
  transition: background 0.2s ease, transform 0.15s ease;
}

.pa-btn-primary:hover {
  background: var(--accent-2-deep);
  transform: translateY(-1px);
}

.pa-cta-sub {
  margin-top: 12px;
  font-family: var(--font-sans);
  font-size: 14px;
  color: var(--ink-dim);
}

/* ---------- Share Row ---------- */
.pa-share-row {
  display: flex;
  gap: 12px;
  justify-content: center;
  margin-top: 32px;
}

.pa-share-btn {
  padding: 8px 20px;
  border: 1px solid var(--rule);
  border-radius: 4px;
  background: var(--bg-elev);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 12px;
  text-transform: uppercase;
  cursor: pointer;
  transition: border-color 0.2s ease, background 0.2s ease;
}

.pa-share-btn:hover {
  border-color: var(--accent);
  background: var(--bg-elev-2);
}

.pa-attribution {
  margin-top: 40px;
  font-family: var(--font-mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--ink-faint);
}

/* ---------- Per-Scene Fallback Gradients (visible when panels not loaded) ---------- */
#pa-boarding .pa-panel-bg { background: linear-gradient(180deg, #0B1628, #142238); }
#pa-pilots .pa-panel-bg { background: linear-gradient(180deg, #0F1B30, #1A2840); }
#pa-incentive .pa-panel-bg { background: linear-gradient(180deg, #1A1420, #2A1A1A); }
#pa-engineers .pa-panel-bg { background: linear-gradient(180deg, #1A0F0F, #2A1515); }
#pa-politicians .pa-panel-bg { background: linear-gradient(180deg, #1E2024, #2A2C30); }
#pa-utopia .pa-panel-bg { background: linear-gradient(180deg, #0B1628 40%, #3D2F10 100%); }
#pa-void .pa-panel-bg { background: radial-gradient(circle at 50% 50%, #0A0A14, #000); }
#pa-landing .pa-panel-bg { background: linear-gradient(180deg, #E8D8B0, var(--bg)); }

/* ---------- Atmospheric Effects ---------- */

/* Speed lines (Scene 3) */
.pa-speed-lines {
  position: absolute;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
  z-index: 3;
}

.pa-speed-lines::before,
.pa-speed-lines::after {
  content: '';
  position: absolute;
  width: 1px;
  height: 50vh;
  background: linear-gradient(to bottom, transparent, rgba(255,255,255,0.2), transparent);
  animation: pa-speed-fall 1.2s linear infinite;
}

.pa-speed-lines::before {
  left: 25%;
  animation-delay: 0s;
}

.pa-speed-lines::after {
  left: 72%;
  animation-delay: 0.5s;
}

@keyframes pa-speed-fall {
  from { transform: translateY(-50vh); }
  to { transform: translateY(100vh); }
}

/* Warning pulse (Scene 4) */
.pa-warning-pulse {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 2;
  box-shadow: inset 0 0 80px rgba(139, 44, 27, 0.4);
  animation: pa-blink 0.9s ease-in-out infinite alternate;
}

@keyframes pa-blink {
  from { opacity: 0.3; }
  to { opacity: 1; }
}

@keyframes pa-alarm-pulse {
  from { background: rgba(139, 44, 27, 0.1); }
  to { background: rgba(139, 44, 27, 0.25); }
}

/* Void vignette (Scene 7) */
.pa-void-vignette {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 3;
  background: radial-gradient(
    circle at 50% 50%,
    transparent 10%,
    rgba(0, 0, 0, 0.5) 40%,
    rgba(0, 0, 0, 0.9) 80%
  );
}

/* Scroll hint (Scene 1) */
.pa-scroll-hint {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  font-family: var(--font-mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: rgba(255, 255, 255, 0.4);
  animation: pa-hint-bob 2s ease-in-out infinite;
}

@keyframes pa-hint-bob {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(6px); }
}

/* ---------- Reduced Motion ---------- */
@media (prefers-reduced-motion: reduce) {
  .pa-line {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .pa-speed-lines::before,
  .pa-speed-lines::after,
  .pa-warning-pulse,
  .pa-scroll-hint {
    animation: none;
  }

  .pa-overlay-alarm {
    animation: none;
  }

  .pa-panel-img {
    will-change: auto;
  }

  .pa-void-vignette {
    opacity: 0.7;
  }
}

/* ---------- Footer on Dark Body ---------- */
.pa-body .site-footer {
  background: var(--bg);
  border-top: 1px solid var(--rule);
}

/* ---------- Responsive ---------- */
@media (max-width: 640px) {
  .pa-text-layer {
    padding: 0 16px;
  }

  .pa-scene {
    min-height: 90vh;
    padding: 60px 0;
  }

  .pa-text-resolve {
    padding-top: 100px;
    padding-bottom: 60px;
  }

  .pa-share-row {
    flex-wrap: wrap;
  }
}