/* === Reset & Variables === */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --bg: #0a0a08;
  --amber: #ffb000;
  --amber-dim: #805800;
  --amber-glow: rgba(255, 176, 0, 0.4);
  --cyan: #00e5ff;
  --cyan-dim: #007a8a;
  --cyan-glow: rgba(0, 229, 255, 0.4);
  --panel-bg: #0d0d0a;
  --sidebar-bg: #0d0d0a;
  --border: #302800;
  --font: 'Cascadia Mono', Consolas, 'Courier New', monospace;
  --sidebar-w: 220px;
  --panel-w: 420px;
}

html, body {
  height: 100%;
  overflow: hidden;
  background: var(--bg);
  color: var(--amber);
  font-family: var(--font);
  font-size: 14px;
  line-height: 1.4;
}

/* === CRT Effects === */
#scanlines {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 1000;
  background: repeating-linear-gradient(
    0deg,
    rgba(0, 0, 0, 0.12) 0px,
    rgba(0, 0, 0, 0.12) 1px,
    transparent 1px,
    transparent 3px
  );
}

#vignette {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 999;
  background: radial-gradient(
    ellipse at center,
    transparent 55%,
    rgba(0, 0, 0, 0.55) 100%
  );
}

@keyframes flicker {
  0%   { opacity: 1; }
  92%  { opacity: 1; }
  93%  { opacity: 0.97; }
  94%  { opacity: 1; }
  96%  { opacity: 0.985; }
  97%  { opacity: 1; }
  100% { opacity: 1; }
}

body {
  animation: flicker 5s infinite;
}

/* === Sidebar Toggle === */
#sidebar-toggle {
  display: none;
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 200;
  background: var(--sidebar-bg);
  border: 1px solid var(--border);
  color: var(--amber);
  font-family: var(--font);
  font-size: 18px;
  padding: 4px 8px;
  cursor: pointer;
  line-height: 1;
  transition: background 0.15s, border-color 0.15s;
}

#sidebar-toggle:hover {
  background: rgba(255, 176, 0, 0.1);
  border-color: var(--amber);
}

/* === Shell Grid === */
#shell {
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr 0px;
  grid-template-rows: 100vh;
  height: 100vh;
  transition: grid-template-columns 0.3s ease;
}

#shell.panel-open {
  grid-template-columns: var(--sidebar-w) 1fr var(--panel-w);
}

/* === Sidebar === */
#sidebar {
  background: var(--sidebar-bg);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
}

#sidebar-header {
  padding: 20px 16px 16px;
  border-bottom: 1px solid var(--border);
}

.logo-text {
  display: block;
  font-size: 24px;
  font-weight: 700;
  color: var(--amber);
  text-shadow: 0 0 10px var(--amber-glow), 0 0 20px var(--amber-glow);
  letter-spacing: 6px;
}

.logo-sub {
  display: block;
  font-size: 11px;
  color: var(--amber-dim);
  margin-top: 4px;
}

#page-list {
  list-style: none;
  flex: 1;
  padding: 8px 0;
}

#page-list li {
  padding: 0;
}

#page-list a {
  display: block;
  padding: 8px 16px;
  color: var(--amber-dim);
  text-decoration: none;
  font-size: 12px;
  border-left: 3px solid transparent;
  transition: color 0.15s, background 0.15s, border-color 0.15s;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

#page-list a:hover {
  color: var(--amber);
  background: rgba(255, 176, 0, 0.05);
}

#page-list a.active {
  color: var(--cyan);
  border-left-color: var(--cyan);
  background: rgba(0, 229, 255, 0.05);
  text-shadow: 0 0 8px var(--cyan-glow);
}

#sidebar-footer {
  padding: 12px 16px;
  border-top: 1px solid var(--border);
  font-size: 10px;
  color: var(--amber-dim);
  line-height: 1.5;
}

#sidebar-footer span {
  display: block;
  margin-bottom: 2px;
}

kbd {
  display: inline-block;
  background: rgba(255, 176, 0, 0.08);
  border: 1px solid var(--amber-dim);
  border-radius: 2px;
  padding: 0 4px;
  font-family: var(--font);
  font-size: 9px;
  color: var(--amber);
  line-height: 1.6;
}

/* === Canvas === */
#canvas-wrap {
  overflow: auto;
  padding: 20px 24px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

#ascii-canvas {
  color: var(--amber);
  font-family: var(--font);
  font-size: 13px;
  line-height: 1.3;
  text-shadow: 0 0 3px var(--amber-glow);
  white-space: pre;
  tab-size: 4;
  margin: 0 auto;
  min-width: 0;
  font-variant-ligatures: none;
  font-feature-settings: 'liga' 0, 'calt' 0;
  -webkit-font-feature-settings: 'liga' 0, 'calt' 0;
}

/* === Page Nav === */
#page-nav {
  display: flex;
  justify-content: space-between;
  width: 100%;
  padding: 16px 0;
  margin-top: 12px;
  border-top: 1px solid var(--border);
}

#page-nav a {
  color: var(--amber-dim);
  text-decoration: none;
  font-size: 12px;
  transition: color 0.15s;
}

#page-nav a:hover {
  color: var(--amber);
}

#page-nav .page-nav-prev::before {
  content: "\2190  ";
}

#page-nav .page-nav-next::after {
  content: "  \2192";
}

/* === Hotspots === */
.hotspot {
  cursor: pointer;
  text-decoration: none;
  border-bottom: 1px dotted #333;
  transition: color 0.12s, border-color 0.12s, text-shadow 0.12s, background 0.12s;
}

.hotspot:hover {
  border-bottom-color: var(--cyan-dim);
}

.hotspot:focus {
  outline: 1px dotted var(--cyan);
  outline-offset: 1px;
}

.hotspot.active {
  border-bottom: 1px dotted var(--cyan-dim);
}

/* === Panel === */
#panel {
  background: var(--panel-bg);
  border-left: 1px solid var(--cyan-dim);
  overflow-y: auto;
  overflow-x: hidden;
  opacity: 0;
  transition: opacity 0.25s ease;
}

#shell.panel-open #panel {
  opacity: 1;
}

#panel-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  padding: 20px 20px 14px;
  border-bottom: 1px solid rgba(0, 229, 255, 0.2);
  position: sticky;
  top: 0;
  background: var(--panel-bg);
  z-index: 2;
}

#panel-title {
  color: var(--cyan);
  font-size: 15px;
  font-weight: 700;
  text-shadow: 0 0 8px var(--cyan-glow);
  flex: 1;
  margin: 0;
  line-height: 1.3;
}

#panel-close {
  background: none;
  border: 1px solid var(--cyan-dim);
  color: var(--cyan);
  font-family: var(--font);
  font-size: 18px;
  cursor: pointer;
  padding: 2px 8px;
  line-height: 1;
  transition: background 0.12s, border-color 0.12s;
  flex-shrink: 0;
  margin-left: 12px;
}

#panel-close:hover {
  background: rgba(0, 229, 255, 0.15);
  border-color: var(--cyan);
}

#panel-body {
  padding: 16px 20px;
  color: var(--amber);
  font-size: 13px;
  line-height: 1.7;
}

#panel-body p {
  margin-bottom: 10px;
}

#panel-body strong {
  color: var(--cyan);
  font-weight: 700;
}

#panel-body code {
  background: rgba(255, 176, 0, 0.08);
  border: 1px solid var(--border);
  padding: 1px 5px;
  font-size: 12px;
  color: var(--amber);
}

#panel-body ul {
  margin: 8px 0 12px 0;
  padding: 0;
  list-style: none;
}

#panel-body ol {
  margin: 8px 0 12px 0;
  padding: 0 0 0 24px;
}

#panel-body ol li {
  padding: 3px 0;
  color: var(--amber);
}

#panel-body ol li::marker {
  color: var(--cyan);
}

#panel-body ul li {
  padding: 3px 0 3px 16px;
  position: relative;
}

#panel-body ul li::before {
  content: "\25B8";
  color: var(--cyan);
  position: absolute;
  left: 0;
}

/* === Panel YAML === */
#panel-yaml {
  padding: 0 20px 16px;
}

#panel-yaml:empty {
  display: none;
}

#panel-yaml pre {
  background: rgba(255, 176, 0, 0.04);
  border: 1px solid var(--border);
  padding: 12px;
  font-size: 11.5px;
  line-height: 1.5;
  overflow-x: auto;
  color: var(--amber);
  font-family: var(--font);
  white-space: pre;
}

.yaml-label {
  display: block;
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--amber-dim);
  margin-bottom: 6px;
}

/* === Panel Related === */
#panel-related {
  padding: 0 20px 20px;
  border-top: 1px solid var(--border);
  margin-top: 4px;
  padding-top: 14px;
}

#panel-related:empty {
  display: none;
  border: none;
  padding: 0;
  margin: 0;
}

.related-label {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--amber-dim);
  margin-bottom: 8px;
}

#panel-related a {
  display: block;
  color: var(--cyan-dim);
  text-decoration: none;
  font-size: 12px;
  padding: 4px 0;
  transition: color 0.12s;
}

#panel-related a:hover {
  color: var(--cyan);
  text-shadow: 0 0 6px var(--cyan-glow);
}

/* === Page Transition === */
@keyframes page-enter {
  0%   { opacity: 0; filter: brightness(2); }
  20%  { opacity: 0.6; filter: brightness(1.4); }
  100% { opacity: 1; filter: brightness(1); }
}

#ascii-canvas.entering {
  animation: page-enter 0.3s ease-out;
}

/* === Loading State === */
#ascii-canvas.loading {
  opacity: 0.3;
}

/* === Scrollbar === */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

::-webkit-scrollbar-track {
  background: var(--bg);
}

::-webkit-scrollbar-thumb {
  background: var(--amber-dim);
  border-radius: 0;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--amber);
}

/* Scrollbar for Firefox */
* {
  scrollbar-width: thin;
  scrollbar-color: var(--amber-dim) var(--bg);
}

/* === Mobile / Collapsible Sidebar === */
@media (max-width: 768px) {
  :root {
    --sidebar-w: 200px;
  }

  #sidebar-toggle {
    display: block;
  }

  #shell {
    display: block;
    height: 100vh;
  }

  #shell.panel-open {
    display: block;
  }

  #panel {
    position: fixed;
    inset: 0;
    width: 100%;
    z-index: 100;
    pointer-events: none;
  }

  #shell.panel-open #panel {
    pointer-events: auto;
  }

  #sidebar {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: 100%;
    z-index: 150;
    transform: translateX(-100%);
    transition: transform 0.25s ease;
  }

  #shell.sidebar-open #sidebar {
    transform: translateX(0);
  }

  #canvas-wrap {
    padding: 40px 4px 20px;
    height: 100vh;
    overflow: auto;
    -webkit-overflow-scrolling: touch;
  }

  #sidebar {
    pointer-events: none;
  }

  #shell.sidebar-open #sidebar {
    pointer-events: auto;
  }

  #ascii-canvas {
    font-size: 1.55vw;
  }

  #scanlines,
  #vignette {
    display: none;
  }

  body {
    animation: none;
  }
}