/* ============================================
   EREBUS ARCHITECTURE PAGE — erebus.css
   Dark instrument-panel aesthetic.
   All variables inherit from styles.css.
   ============================================ */

/* ---- Page shell ---- */
.erebus-page {
  background: var(--ink);
  min-height: 100vh;
  font-family: var(--font-mono);
  color: var(--grey-4);
}

.erebus-page main {
  padding-top: 80px; /* clear fixed nav */
}


/* ---- Lead section ---- */
.ep-lead {
  padding: clamp(56px, 10vw, 120px) 0 clamp(40px, 7vw, 88px);
  position: relative;
  border-bottom: 1px solid var(--line);
}

/* Dot-grid background on the lead */
.ep-lead::before {
  content: '';
  position: absolute; inset: 0;
  background-image: radial-gradient(circle, var(--line) 1px, transparent 1px);
  background-size: 28px 28px;
  opacity: 0.45;
  pointer-events: none;
}
.ep-lead .container { position: relative; }

.ep-eyebrow {
  display: flex; align-items: center; gap: 12px;
  margin-bottom: 28px; flex-wrap: wrap;
}

.ep-title {
  font-family: var(--font-serif);
  font-size: clamp(40px, 7vw, 88px);
  line-height: 1.04;
  letter-spacing: -0.02em;
  color: var(--grey-4);
  margin-bottom: 32px;
  text-wrap: balance;
}
.ep-title em { font-style: italic; color: var(--violet-bright); }

.ep-hostile-block {
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-left: 3px solid var(--cyan);
  padding: clamp(24px, 4vw, 40px);
  max-width: 68ch;
  position: relative;
}
.ep-hostile-block::before {
  content: '//';
  position: absolute; top: -1px; right: 16px;
  font-family: var(--font-mono); font-size: 9px;
  letter-spacing: 0.18em; color: var(--grey-1);
  background: var(--ink-2); padding: 0 6px;
  transform: translateY(-50%);
}
.ep-hostile-text {
  font-family: var(--font-mono);
  font-size: clamp(14px, 1.4vw, 16px);
  line-height: 1.75;
  color: var(--grey-4);
  margin: 0;
}
.ep-hostile-text em {
  font-style: normal;
  color: var(--cyan);
  font-weight: 600;
}

/* ---- KPI Cards row ---- */
.ep-kpi-row {
  padding: clamp(32px, 6vw, 64px) 0;
  border-bottom: 1px solid var(--line);
}
.ep-kpi-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
@media (min-width: 720px) {
  .ep-kpi-grid { grid-template-columns: repeat(4, 1fr); }
}
.ep-kpi-cell {
  background: var(--ink-2);
  padding: 24px 20px;
  display: flex; flex-direction: column; gap: 8px;
  position: relative;
  transition: background 250ms;
}
.ep-kpi-cell:hover { background: var(--ink-3); }
.ep-kpi-value {
  font-family: var(--font-mono);
  font-size: clamp(20px, 2.2vw, 28px);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
}
.ep-kpi-cell:nth-child(1) .ep-kpi-value { color: var(--violet-bright); }
.ep-kpi-cell:nth-child(2) .ep-kpi-value { color: var(--cyan); }
.ep-kpi-cell:nth-child(3) .ep-kpi-value { color: var(--lime); }
.ep-kpi-cell:nth-child(4) .ep-kpi-value { color: var(--amber); }
.ep-kpi-label {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--grey-2);
}

/* ---- Architecture diagram section ---- */
.ep-arch {
  padding: clamp(56px, 8vw, 96px) 0;
  border-bottom: 1px solid var(--line);
}
.ep-arch-head {
  margin-bottom: clamp(32px, 5vw, 56px);
}
.ep-arch-title {
  font-family: var(--font-serif);
  font-size: clamp(28px, 3.8vw, 48px);
  color: var(--grey-4);
  margin-top: 16px;
  letter-spacing: -0.01em;
}

/* ---- Diagram wrapper ---- */
.ep-diagram {
  background: var(--ink-2);
  border: 1px solid var(--line);
  padding: clamp(20px, 3vw, 40px);
  position: relative;
  overflow: hidden;
}

/* Subtle dot-grid inside the diagram */
.ep-diagram::before {
  content: '';
  position: absolute; inset: 0;
  background-image: radial-gradient(circle, rgba(38, 38, 44, 0.8) 1px, transparent 1px);
  background-size: 20px 20px;
  pointer-events: none;
}

.ep-diagram-inner {
  position: relative; /* above pseudo-element */
  display: flex;
  gap: clamp(12px, 2vw, 24px);
  align-items: stretch;
}

/* Arrow column (left side of diagram) */
.ep-arrow-col {
  display: flex;
  flex-direction: column;
  align-items: center;
  flex-shrink: 0;
  width: 32px;
  padding-top: 18px;
}

.ep-arrow-track {
  position: relative;
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
}

/* Main flow line (top-down, violet) */
.ep-main-line {
  position: absolute;
  top: 0; bottom: 0;
  left: 50%; transform: translateX(-50%);
  width: 2px;
  background: linear-gradient(180deg, var(--violet) 0%, var(--violet-deep) 100%);
  opacity: 0.6;
}

/* Reward signal line (bottom-up, cyan) — overlaid offset */
.ep-reward-line {
  position: absolute;
  bottom: 0; top: 0;
  left: calc(50% + 6px);
  width: 2px;
  background: linear-gradient(0deg, var(--cyan) 0%, rgba(34,211,238,0.2) 100%);
  opacity: 0.5;
}

/* Arrowhead at the bottom of main line */
.ep-arrow-tip-down {
  position: absolute;
  bottom: 0; left: 50%;
  transform: translateX(-50%);
  width: 0; height: 0;
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
  border-top: 6px solid var(--violet);
}

/* Arrowhead at the top of reward line pointing up */
.ep-arrow-tip-up {
  position: absolute;
  top: 0; left: calc(50% + 6px);
  transform: translateX(-50%);
  width: 0; height: 0;
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
  border-bottom: 6px solid var(--cyan);
}

/* Animated pulse dot (main flow) */
.ep-pulse-dot {
  position: absolute;
  left: 50%; transform: translateX(-50%);
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--violet-bright);
  box-shadow: 0 0 12px var(--violet-glow);
  animation: ep-flow-down 4s cubic-bezier(0.4, 0, 0.6, 1) infinite;
  top: 0;
}

/* Animated pulse dot (reward signal, cyan) */
.ep-pulse-dot-reward {
  position: absolute;
  left: calc(50% + 6px); transform: translateX(-50%);
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 10px var(--cyan-glow);
  animation: ep-flow-up 4s cubic-bezier(0.4, 0, 0.6, 1) infinite;
  animation-delay: 2s;
  bottom: 0;
}

@keyframes ep-flow-down {
  0%   { top: 0%;   opacity: 0; }
  5%   { opacity: 1; }
  90%  { opacity: 1; }
  100% { top: 100%; opacity: 0; }
}

@keyframes ep-flow-up {
  0%   { bottom: 0%;    opacity: 0; }
  5%   { opacity: 1; }
  90%  { opacity: 1; }
  100% { bottom: 56%;   opacity: 0; }
  /* reward goes from Observability back up to Intelligence (~60% of height) */
}

@media (prefers-reduced-motion: reduce) {
  .ep-pulse-dot,
  .ep-pulse-dot-reward { animation: none; opacity: 0; }
}

/* ---- Layer stack ---- */
.ep-layers {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}

/* ---- Individual layer button ---- */
.ep-layer {
  border: 1px solid var(--line);
  background: var(--ink);
  transition: border-color 200ms, background 200ms;
  position: relative;
  overflow: hidden;
}
.ep-layer:hover { border-color: var(--grey-1); }
.ep-layer.is-open { border-color: var(--violet); background: rgba(168,85,247,0.04); }
.ep-layer.ep-layer-perimeter.is-open   { border-color: var(--violet); }
.ep-layer.ep-layer-control.is-open     { border-color: var(--cyan); }
.ep-layer.ep-layer-intelligence.is-open{ border-color: var(--violet-bright); }
.ep-layer.ep-layer-execution.is-open   { border-color: var(--lime); }
.ep-layer.ep-layer-observability.is-open{ border-color: var(--amber); }

/* Left accent bar */
.ep-layer-perimeter    .ep-layer-bar { background: var(--violet); }
.ep-layer-control      .ep-layer-bar { background: var(--cyan); }
.ep-layer-intelligence .ep-layer-bar { background: var(--violet-bright); }
.ep-layer-execution    .ep-layer-bar { background: var(--lime); }
.ep-layer-observability .ep-layer-bar { background: var(--amber); }

.ep-layer-bar {
  position: absolute; top: 0; left: 0; bottom: 0;
  width: 3px;
}

/* Layer header row (the clickable toggle) */
.ep-layer-hdr {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px 14px 20px;
  cursor: pointer;
  width: 100%;
  background: none; border: none; color: inherit; font: inherit;
  text-align: left;
  -webkit-tap-highlight-color: transparent;
  transition: background 150ms;
}
.ep-layer-hdr:hover { background: rgba(255,255,255,0.02); }
.ep-layer-hdr:focus-visible {
  outline: 2px solid var(--violet);
  outline-offset: -2px;
}

.ep-layer-index {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  color: var(--grey-1);
  flex-shrink: 0;
  min-width: 28px;
}
.ep-layer-name {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  flex: 1;
}
.ep-layer-perimeter    .ep-layer-name { color: var(--violet-bright); }
.ep-layer-control      .ep-layer-name { color: var(--cyan); }
.ep-layer-intelligence .ep-layer-name { color: var(--violet-bright); }
.ep-layer-execution    .ep-layer-name { color: var(--lime); }
.ep-layer-observability .ep-layer-name { color: var(--amber); }

.ep-layer-nodes-preview {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--grey-1);
  letter-spacing: 0.06em;
  flex-shrink: 0;
  display: none;
}
@media (min-width: 600px) { .ep-layer-nodes-preview { display: block; } }

.ep-layer-chevron {
  font-size: 10px;
  color: var(--grey-1);
  flex-shrink: 0;
  transition: transform 200ms, color 200ms;
  font-style: normal;
}
.ep-layer.is-open .ep-layer-chevron {
  transform: rotate(90deg);
  color: var(--grey-4);
}

/* Expanded node grid */
.ep-layer-body {
  padding: 0 16px 16px 20px;
  display: none;
}
.ep-layer.is-open .ep-layer-body { display: block; }

.ep-nodes {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 4px;
}

.ep-node {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--grey-4);
  border: 1px solid var(--line);
  background: var(--ink-2);
  padding: 6px 12px;
  position: relative;
  transition: border-color 200ms;
}
.ep-layer-perimeter    .ep-node { border-left-color: var(--violet); }
.ep-layer-control      .ep-node { border-left-color: var(--cyan); }
.ep-layer-intelligence .ep-node { border-left-color: var(--violet-bright); }
.ep-layer-execution    .ep-node { border-left-color: var(--lime); }
.ep-layer-observability .ep-node { border-left-color: var(--amber); }

/* Reward signal annotation */
.ep-reward-note {
  margin-top: 16px;
  padding: 10px 14px;
  border: 1px dashed rgba(34,211,238,0.3);
  border-radius: 0;
  display: flex;
  align-items: center;
  gap: 10px;
  background: rgba(34,211,238,0.04);
}
.ep-reward-dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 8px var(--cyan-glow);
  flex-shrink: 0;
  animation: pulse 2.4s ease-in-out infinite;
}
.ep-reward-text {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  color: var(--cyan);
  text-transform: uppercase;
}

/* Legend row below the diagram */
.ep-diagram-legend {
  margin-top: 20px;
  display: flex;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
}
.ep-legend-item {
  display: flex; align-items: center; gap: 8px;
  font-family: var(--font-mono); font-size: 10px;
  letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--grey-2);
}
.ep-legend-line {
  width: 24px; height: 2px;
  flex-shrink: 0;
}
.ep-legend-line.violet { background: var(--violet); }
.ep-legend-line.cyan   { background: var(--cyan); }

/* ---- Hostile network deep dive ---- */
.ep-deep {
  padding: clamp(56px, 8vw, 96px) 0;
}

.ep-deep-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2px;
  margin-top: clamp(32px, 5vw, 56px);
}

.ep-deep-card {
  border: 1px solid var(--line);
  background: var(--ink-2);
  padding: clamp(24px, 4vw, 40px);
  position: relative;
  transition: border-color 250ms;
}
.ep-deep-card:hover { border-color: var(--grey-1); }

.ep-deep-card-num {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  color: var(--grey-1);
  margin-bottom: 14px;
  display: flex; align-items: center; gap: 10px;
}
.ep-deep-card-num::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--line);
}

.ep-deep-card-title {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 600;
  color: var(--grey-4);
  letter-spacing: 0.04em;
  margin-bottom: 14px;
}
.ep-deep-card:nth-child(1) .ep-deep-card-title { color: var(--violet-bright); }
.ep-deep-card:nth-child(2) .ep-deep-card-title { color: var(--cyan); }
.ep-deep-card:nth-child(3) .ep-deep-card-title { color: var(--lime); }

.ep-deep-card-body {
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.72;
  color: var(--grey-4);
  max-width: 68ch;
  margin: 0;
}
.ep-deep-card-body strong {
  color: var(--grey-4);
  font-weight: 600;
}
.ep-deep-card-body code {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--cyan);
  background: rgba(34,211,238,0.08);
  padding: 1px 5px;
  border: 1px solid rgba(34,211,238,0.15);
}

/* ---- Resource partnerships ---- */
.ep-partners {
  padding: clamp(56px, 8vw, 96px) 0;
  border-bottom: 1px solid var(--line);
}

.ep-partners-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2px;
  background: var(--line);
  border: 1px solid var(--line);
  margin-top: clamp(32px, 5vw, 56px);
}
@media (min-width: 720px) {
  .ep-partners-grid { grid-template-columns: repeat(4, 1fr); }
}

.ep-partner-cell {
  background: var(--ink-2);
  padding: 24px 20px;
  display: flex; flex-direction: column; gap: 10px;
  transition: background 200ms;
}
.ep-partner-cell:hover { background: var(--ink-3); }

.ep-partner-name {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--grey-4);
}

.ep-partner-desc {
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.6;
  color: var(--grey-2);
  margin: 0;
}

.ep-partner-cta {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--violet-bright);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 200ms, color 200ms;
  display: inline-block;
  margin-top: auto;
  padding-top: 8px;
}
.ep-partner-cta:hover { border-bottom-color: var(--violet); color: var(--cyan); }


/* ---- Responsive tweaks ---- */
@media (max-width: 540px) {
  .ep-diagram-inner { gap: 8px; }
  .ep-arrow-col { width: 20px; }
  .ep-layer-hdr { padding: 12px 12px 12px 16px; gap: 8px; }
  .ep-deep-grid { gap: 1px; }
  .ep-partners-grid { grid-template-columns: 1fr 1fr; }
}