/* ==========================================================================
   Squeektoshi Radio — Landing Page Stylesheet
   Art Direction: Technical drawing / Observatory instrument
   Palette: Near-black #0b0b0e, Bone #e9e6dc, Signal Amber #ffb23e, Brand Blue #5b8cff
   ========================================================================== */

/* 1. Self-hosted Fonts */
@font-face {
  font-family: 'Cinzel';
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url('assets/fonts/cinzel.woff2') format('woff2');
}

@font-face {
  font-family: 'Cinzel';
  font-style: normal;
  font-weight: 800;
  font-display: swap;
  src: url('assets/fonts/cinzel.woff2') format('woff2');
}

@font-face {
  font-family: 'IBM Plex Mono';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('assets/fonts/ibm-plex-mono-regular.woff2') format('woff2');
}

@font-face {
  font-family: 'IBM Plex Mono';
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url('assets/fonts/ibm-plex-mono-semibold.woff2') format('woff2');
}

/* 2. Custom Properties */
:root {
  --color-bg: #0b0b0e;
  --color-bone: #e9e6dc;
  --color-bone-muted: rgba(233, 230, 220, 0.65);
  --color-bone-subtle: rgba(233, 230, 220, 0.28);
  --color-hairline: rgba(233, 230, 220, 0.08);
  --color-hairline-bright: rgba(233, 230, 220, 0.18);
  
  --color-amber: #ffb23e;
  --color-amber-muted: rgba(255, 178, 62, 0.3);
  --color-blue: #5b8cff;
  
  --font-display: 'Cinzel', Georgia, 'Times New Roman', serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, Menlo, Monaco, Consolas, monospace;
  
  --ease-reveal: cubic-bezier(0.22, 1, 0.36, 1);
  --duration-short: 0.6s;
  --duration-long: 1.2s;
  
  --grid-columns: 12;
  --grid-gutter: 1.5rem;
  --page-margin: 2rem;
}

/* 3. Base & Reset */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  background-color: var(--color-bg);
  color: var(--color-bone);
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
}

body {
  background-color: var(--color-bg);
  color: var(--color-bone);
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
}

/* 4. Film Grain Overlay */
.film-grain {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: 999;
  opacity: 0.035;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
}

/* 5. Visible 12-Column Hairline Grid Overlay */
.hairline-grid-container {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 10;
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  padding: 0 var(--page-margin);
  border-left: 1px solid var(--color-hairline);
  border-right: 1px solid var(--color-hairline);
}

.grid-line-col {
  height: 100%;
  border-right: 1px solid var(--color-hairline);
}

.grid-line-col:last-child {
  border-right: none;
}

/* Corner datum cross markers */
.datum-cross {
  position: absolute;
  width: 11px;
  height: 11px;
  color: var(--color-bone-subtle);
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 11px;
  user-select: none;
  pointer-events: none;
}
.datum-cross-tl { top: var(--page-margin); left: var(--page-margin); }
.datum-cross-tr { top: var(--page-margin); right: var(--page-margin); }
.datum-cross-bl { bottom: var(--page-margin); left: var(--page-margin); }
.datum-cross-br { bottom: var(--page-margin); right: var(--page-margin); }

/* 6. Fixed HUD Bar (Technical Readout in 4 Corners) */
.hud-layer {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 50;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 1.25rem var(--page-margin);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-bone-muted);
}

.hud-top-row, .hud-bottom-row {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  width: 100%;
}

.hud-group {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.hud-item {
  display: inline-flex;
  gap: 0.45rem;
}

.hud-label {
  color: var(--color-bone-subtle);
}

.hud-val {
  color: var(--color-bone);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

.hud-val.data-blue {
  color: var(--color-blue);
}

.hud-val.amber {
  color: var(--color-amber);
}

.hud-val.unknown {
  color: var(--color-bone-muted);
}

/* 7. Canvas & SVG Wheel Container */
.scene-container {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100vh;
  z-index: 20;
  pointer-events: none;
}

#webgl-canvas {
  width: 100%;
  height: 100%;
  display: block;
}

/* Fallback SVG Wheel (visible when WebGL is absent or failing) */
.fallback-wheel-svg {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: min(80vw, 560px);
  height: min(80vw, 560px);
  display: none;
  pointer-events: none;
  opacity: 0.85;
}

body.webgl-fallback .fallback-wheel-svg {
  display: block;
  animation: slow-svg-spin 40s linear infinite;
}

body.webgl-fallback #webgl-canvas {
  display: none;
}

@keyframes slow-svg-spin {
  from { transform: translate(-50%, -50%) rotate(0deg); }
  to { transform: translate(-50%, -50%) rotate(360deg); }
}

/* 8. Pinned Scroll Narrative Sections */
.scroll-viewport {
  position: relative;
  z-index: 30;
  width: 100%;
}

.scroll-section {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 4rem var(--page-margin);
  max-width: 1440px;
  margin: 0 auto;
  position: relative;
}

/* Masked text reveal containers */
.mask-line-wrapper {
  overflow: hidden;
  display: block;
  line-height: 1.15;
}

.mask-line {
  display: block;
  transform: translateY(0);
  transition: transform var(--duration-long) var(--ease-reveal);
}

/* Eyebrow */
.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-bone-muted);
  margin-bottom: 1.25rem;
}

.eyebrow-rule {
  display: inline-block;
  width: 28px;
  height: 1px;
  background-color: var(--color-hairline-bright);
  vertical-align: middle;
  margin-right: 0.75rem;
}

/* Monumental Display Headline */
.hero-headline {
  font-family: var(--font-display);
  font-size: clamp(3rem, 9.5vw, 8.5rem);
  font-weight: 800;
  line-height: 0.95;
  letter-spacing: -0.03em;
  text-transform: uppercase;
  color: var(--color-bone);
  margin-bottom: 2rem;
  max-width: 14ch;
}

/* Subtitle */
.hero-subtitle {
  font-family: var(--font-mono);
  font-size: clamp(1rem, 2vw, 1.45rem);
  line-height: 1.5;
  color: var(--color-bone-muted);
  max-width: 48ch;
  margin-bottom: 2.75rem;
  letter-spacing: -0.01em;
}

/* CTA Buttons & Technical Links */
.cta-group {
  display: flex;
  align-items: center;
  gap: 2.5rem;
  pointer-events: auto;
}

.btn-launch-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.9rem 2.4rem;
  background-color: transparent;
  color: var(--color-amber);
  border: 1px solid var(--color-amber);
  font-family: var(--font-mono);
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  text-decoration: none;
  cursor: pointer;
  position: relative;
  overflow: hidden;
  transition: color var(--duration-short) var(--ease-reveal), background-color var(--duration-short) var(--ease-reveal), border-color var(--duration-short) var(--ease-reveal);
}

.btn-launch-primary:hover, .btn-launch-primary:focus-visible {
  background-color: var(--color-amber);
  color: #0b0b0e;
  outline: none;
  box-shadow: 0 0 24px rgba(255, 178, 62, 0.3);
}

.btn-launch-primary:focus-visible {
  outline: 2px solid var(--color-bone);
  outline-offset: 4px;
}

.link-secondary-how {
  color: var(--color-bone-muted);
  text-decoration: none;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border-bottom: 1px solid var(--color-hairline-bright);
  padding-bottom: 2px;
  transition: color var(--duration-short) var(--ease-reveal), border-color var(--duration-short) var(--ease-reveal);
}

.link-secondary-how:hover, .link-secondary-how:focus-visible {
  color: var(--color-bone);
  border-bottom-color: var(--color-bone);
  outline: none;
}

/* Chapters 01, 02, 03 */
.chapter-content {
  max-width: 680px;
}

.chapter-number {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.2em;
  color: var(--color-amber);
  text-transform: uppercase;
  margin-bottom: 0.85rem;
  display: block;
}

.chapter-statement {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5.5vw, 4.4rem);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--color-bone);
  margin-bottom: 1.5rem;
}

.chapter-description {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  color: var(--color-bone-muted);
  line-height: 1.7;
  max-width: 48ch;
}

/* Closing Section */
.closing-section {
  text-align: center;
  align-items: center;
}

.closing-statement {
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 7vw, 5.5rem);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.02em;
  text-transform: uppercase;
  color: var(--color-bone);
  margin-bottom: 2.5rem;
}

/* 9. Landing Footer */
.landing-footer {
  position: relative;
  z-index: 40;
  border-top: 1px solid var(--color-hairline);
  padding: 2rem var(--page-margin);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1.5rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-bone-muted);
}

.footer-copy {
  letter-spacing: 0.05em;
}

.footer-links-group {
  display: flex;
  gap: 1.5rem;
}

.footer-link {
  color: var(--color-bone-muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--duration-short) var(--ease-reveal), border-color var(--duration-short) var(--ease-reveal);
}

.footer-link:hover, .footer-link:focus-visible {
  color: var(--color-bone);
  border-bottom-color: var(--color-bone);
}

/* 10. Amber Wipe Transition Overlay */
.wipe-overlay {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100vh;
  z-index: 10000;
  pointer-events: none;
  background: transparent;
  transform: translateX(-100%);
  border-right: 3px solid var(--color-amber);
}

.wipe-overlay.active {
  background-color: var(--color-bg);
  transform: translateX(0%);
  transition: transform 0.6s cubic-bezier(0.85, 0, 0.15, 1);
}

/* 11. Reduced Motion Preference */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  
  .mask-line {
    transform: none !important;
  }
  
  .wipe-overlay {
    display: none !important;
  }
  
  body.webgl-fallback .fallback-wheel-svg {
    animation: none !important;
  }
}

/* 12. Responsive Adjustments */
@media (max-width: 768px) {
  :root {
    --page-margin: 1.25rem;
  }
  
  .datum-cross {
    display: none;
  }
  
  .hud-layer {
    padding: 0.85rem var(--page-margin);
    font-size: 0.65rem;
  }
  
  .hud-group {
    gap: 0.85rem;
  }
  
  .hud-top-row, .hud-bottom-row {
    flex-direction: column;
    gap: 0.35rem;
  }
  
  .cta-group {
    flex-direction: column;
    align-items: flex-start;
    gap: 1.25rem;
  }
  
  .landing-footer {
    flex-direction: column;
    align-items: flex-start;
  }
}