/* ============================================================
   LESVOS — FLUID MESH TIMELINE
   Aesthetic: Dark Japandi · Warm Muted Accents · Editorial
   ============================================================ */

:root {
  /* Core Palette */
  --bg:          #0d0c0b;
  --bg-panel:    #111009;
  --surface:     #1a1813;
  --border:      #2a2720;
  --border-glow: #3d3828;

  /* Text */
  --text-primary:  #d4cdb8;
  --text-secondary:#8a8070;
  --text-muted:    #4a4438;
  --text-accent:   #c9a96e;
  --text-em:       #e8dfc8;

  /* Accents */
  --gold:       #c9a96e;
  --gold-dim:   #7a6340;
  --amber:      #b8823a;
  --warm-white: #f0e8d8;
  --slate:      #6a7a8a;

  /* Canvas */
  --canvas-bg:  #070605;

  /* Fonts */
  --font-display: 'Cormorant Garamond', Georgia, serif;
  --font-body:    'Raleway', 'Gill Sans', sans-serif;

  /* Layout */
  --left-width:  45%;
  --right-width: 55%;
}

/* ---- RESET ---- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  background: var(--bg);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-weight: 300;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* ============================================================
   SPLASH SCREEN — Gold wave curtain animation
   Right-to-left moving wave: black → gold → black
   Hardware-accelerated via background-position shift
   ============================================================ */
#splash {
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  z-index: 9999;

  /* Multi-stop gradient: black baseline with a narrow gold sweep band */
  background: linear-gradient(
    270deg,
    #080808 0%,
    #080808 20%,
    #a07828 38%,
    #D4AF37 48%,
    #c9a040 52%,
    #7a5a18 60%,
    #080808 72%,
    #080808 100%
  );
  background-size: 400% 400%;

  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;

  /* Wave sweep animation */
  animation: goldWaveCurtain 7s cubic-bezier(0.45, 0, 0.55, 1) infinite;

  /* Fade-out transition on opacity only */
  transition: opacity 1.5s ease;
  opacity: 1;
}

/* Step 1: click fires — instantly stop blocking input, start fading */
#splash.hidden {
  opacity: 0;
  pointer-events: none !important;
  /* animation keeps running so wave doesn't freeze during 1.5s fade */
}

/* Step 2: after fade completes — fully off screen, no GPU layer */
#splash.gone {
  display: none !important;
  pointer-events: none !important;
  visibility: hidden;
  opacity: 0;
  animation: none;
}

/* Keyframe: sweep background-position right-to-left */
@keyframes goldWaveCurtain {
  0%   { background-position: 0%   50%; }
  50%  { background-position: 100% 50%; }
  100% { background-position: 0%   50%; }
}

/* All splash content sits above the wave */
#splash h1,
#splash h2,
#splash p,
#splash button,
.splash-inner,
.splash-footer {
  position: relative;
  z-index: 10000;
}

/* Splash canvas — hidden; background wave replaces it */
#splash-canvas {
  display: none;
}

.splash-inner {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 2rem;
  max-width: 600px;
  animation: splashReveal 1.2s ease forwards;
}

@keyframes splashReveal {
  from { opacity: 0; transform: translateY(18px); }
  to   { opacity: 1; transform: translateY(0); }
}

.splash-glyph {
  font-family: var(--font-display);
  font-size: 7.5rem;
  font-weight: 300;
  color: var(--gold);
  line-height: 1;
  margin-bottom: 0.5rem;
  letter-spacing: 0.05em;
  opacity: 0.85;
}

.splash-title {
  font-family: var(--font-display);
  font-size: 4.2rem;
  font-weight: 300;
  font-style: italic;
  letter-spacing: 0.12em;
  color: var(--text-em);
  margin-bottom: 0.3rem;
}

.splash-subtitle {
  font-family: var(--font-body);
  font-size: 0.88rem;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--text-primary);
  margin-bottom: 2.5rem;
}

.splash-tagline {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-style: italic;
  color: var(--text-secondary);
  margin-bottom: 3rem;
  line-height: 1.7;
}

#enter-btn {
  display: inline-block;
  background: transparent;
  border: 1px solid var(--gold-dim);
  color: var(--gold);
  font-family: var(--font-body);
  font-size: 0.82rem;
  font-weight: 400;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  padding: 1.1rem 3rem;
  cursor: pointer;
  transition: all 0.35s ease;
  position: relative;
  overflow: hidden;
}

#enter-btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--gold);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.35s ease;
  z-index: -1;
}

#enter-btn:hover {
  color: var(--bg);
  border-color: var(--gold);
}

#enter-btn:hover::before {
  transform: scaleX(1);
}

.splash-hint {
  font-size: 0.75rem;
  letter-spacing: 0.10em;
  color: var(--text-secondary);
  margin-top: 1.5rem;
}

/* ── Splash footer ───────────────────────────────────────── */
.splash-footer {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 2;
  padding: 1.6rem 2.5rem;
  display: flex;
  justify-content: center;
  /* Subtle gradient mask so it blends into the gold wave */
  background: linear-gradient(
    to top,
    rgba(13,12,11,0.82) 0%,
    rgba(13,12,11,0.30) 60%,
    transparent 100%
  );
}

.splash-footer-inner {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  flex-wrap: wrap;
  justify-content: center;
}

.splash-copy,
.splash-credit,
.splash-version {
  font-family: var(--font-body);
  font-size: 0.78rem;
  font-weight: 400;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(201,169,110,0.75);
  white-space: nowrap;
}

.splash-footer-sep {
  font-family: var(--font-body);
  font-size: 0.78rem;
  color: rgba(201,169,110,0.35);
  letter-spacing: 0;
}

.splash-version {
  color: rgba(201,169,110,0.55);
  letter-spacing: 0.22em;
}

.splash-link {
  color: rgba(201,169,110,0.80);
  text-decoration: none;
  letter-spacing: 0.14em;
  border-bottom: 1px solid rgba(201,169,110,0.30);
  padding-bottom: 0.05em;
  transition: color 0.3s ease, border-color 0.3s ease;
}

.splash-link:hover {
  color: #c9a96e;
  border-color: rgba(201,169,110,0.75);
}

/* ============================================================
   MAIN LAYOUT
   ============================================================ */
#main-layout {
  display: flex;
  height: 100vh;
  overflow: hidden;
}

/* ============================================================
   LEFT PANEL — Scrollable
   ============================================================ */
#text-panel {
  width: var(--left-width);
  height: 100vh;
  background: var(--bg-panel);
  padding: 0;
  overflow-y: scroll;
  position: relative;
  z-index: 10;
  border-right: 1px solid var(--border);
  box-sizing: border-box;
}

/* Subtle vertical rule / grain texture */
#text-panel::before {
  content: '';
  position: fixed;
  left: var(--left-width);
  top: 0;
  width: 1px;
  height: 100vh;
  background: linear-gradient(
    to bottom,
    transparent 0%,
    var(--border-glow) 20%,
    var(--gold-dim) 50%,
    var(--border-glow) 80%,
    transparent 100%
  );
  z-index: 20;
  pointer-events: none;
  opacity: 0.6;
}

/* ---- Timeline Header ---- */
.timeline-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 2.2rem 3rem 1.8rem;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: var(--bg-panel);
  z-index: 30;
}

.header-label {
  font-family: var(--font-body);
  font-size: 0.6rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.header-rule {
  flex: 1;
  height: 1px;
  background: var(--border);
}

/* ---- Story Sections ---- */
.story-section {
  padding: 5rem 3rem 5rem 3rem;
  border-bottom: 1px solid var(--border);
  opacity: 0.15;
  transition: opacity 0.6s ease, border-color 0.6s ease;
  cursor: default;
}

.story-section.active {
  opacity: 1;
  border-color: var(--border-glow);
}

.story-section:first-of-type {
  opacity: 1; /* first section starts active */
}

.section-inner {
  max-width: 420px;
}

/* Epoch Marker */
.epoch-marker {
  display: flex;
  align-items: baseline;
  gap: 1.2rem;
  margin-bottom: 1.8rem;
}

.epoch-num {
  font-family: var(--font-body);
  font-size: 0.6rem;
  font-weight: 400;
  letter-spacing: 0.2em;
  color: var(--gold-dim);
}

.epoch-time {
  font-family: var(--font-body);
  font-size: 0.65rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-secondary);
}

/* Section Title */
.section-title {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 300;
  line-height: 1.25;
  color: var(--text-em);
  margin-bottom: 1.8rem;
  letter-spacing: 0.02em;
}

/* Section Body */
.section-body p {
  font-family: var(--font-display);
  font-size: 1.02rem;
  font-weight: 300;
  line-height: 1.85;
  color: var(--text-primary);
  margin-bottom: 1.1rem;
}

.section-body p:last-child {
  margin-bottom: 0;
}

.section-body em {
  font-style: italic;
  color: var(--text-accent);
}

.section-body strong {
  font-weight: 400;
  color: var(--warm-white);
}

/* Footnote */
.section-footnote {
  margin-top: 2.2rem;
  font-family: var(--font-body);
  font-size: 0.58rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--text-muted);
  padding-top: 1rem;
  border-top: 1px solid var(--border);
  line-height: 1.8;
}

/* Footer */
.timeline-footer {
  padding: 3rem 3rem;
  font-family: var(--font-body);
  font-size: 0.58rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--text-muted);
  border-top: 1px solid var(--border);
}

/* ============================================================
   RIGHT PANEL — Fixed Canvas
   ============================================================ */
#canvas-container {
  width: var(--right-width);
  height: 100vh;
  position: fixed;
  right: 0;
  top: 0;
  background: var(--canvas-bg);
  overflow: hidden;
  will-change: transform;     /* promote to own GPU layer */
  transform: translateZ(0);   /* force compositing layer */
}

#canvas-container canvas {
  will-change: transform;
  transform: translateZ(0);
}

#canvas-container canvas {
  display: block;
  width: 100% !important;
  height: 100% !important;
}

/* Canvas Label */
#canvas-label {
  position: absolute;
  bottom: 2.5rem;
  left: 2.5rem;
  z-index: 10;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  pointer-events: none;
}

#canvas-section-num {
  font-family: var(--font-body);
  font-size: 0.55rem;
  letter-spacing: 0.3em;
  color: rgba(201,169,110,0.4);
}

#canvas-section-title {
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-style: italic;
  color: rgba(212,205,184,0.3);
  letter-spacing: 0.05em;
  transition: opacity 0.8s ease;
}

/* Audio Indicator */
#audio-indicator {
  position: absolute;
  top: 2rem;
  right: 2rem;
  z-index: 10;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  opacity: 0;
  transition: opacity 1s ease;
  pointer-events: none;
}

#audio-indicator.visible {
  opacity: 1;
}

#audio-indicator span {
  font-family: var(--font-body);
  font-size: 0.5rem;
  letter-spacing: 0.25em;
  color: rgba(201,169,110,0.5);
}

.timer-sep {
  color: rgba(201,169,110,0.25) !important;
  letter-spacing: 0.1em !important;
}

#session-timer {
  font-family: var(--font-body);
  font-size: 0.5rem;
  letter-spacing: 0.18em;
  color: rgba(201,169,110,0.4);
  font-variant-numeric: tabular-nums;
  min-width: 2.8em;
}

.pulse-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--gold);
  opacity: 0.7;
  animation: pulseDot 2s ease-in-out infinite;
}

@keyframes pulseDot {
  0%, 100% { opacity: 0.7; transform: scale(1); }
  50%       { opacity: 0.3; transform: scale(0.6); }
}

/* ============================================================
   SCROLLBAR — Minimal
   ============================================================ */
#text-panel::-webkit-scrollbar {
  width: 3px;
}
#text-panel::-webkit-scrollbar-track {
  background: var(--bg);
}
#text-panel::-webkit-scrollbar-thumb {
  background: var(--border-glow);
  border-radius: 2px;
}

/* ============================================================
   SELECTION
   ============================================================ */
::selection {
  background: rgba(201,169,110,0.2);
  color: var(--warm-white);
}