/* hud.css */
/* Root HUD variables */
:root {
  --hud-bg: #020712;
  --hud-grid: rgba(120, 200, 255, 0.08);
  --hud-primary: #7fd4ff;
  --hud-primary-soft: rgba(127, 212, 255, 0.35);
  --hud-accent: #4cf0ff;
  --hud-danger: #ff6b81;
  --hud-text: #e9f5ff;
  --hud-muted: #7a8ba0;
  --hud-border: rgba(127, 212, 255, 0.35);
  --hud-panel-bg: rgba(4, 12, 24, 0.92);
  --hud-panel-glow: 0 0 24px rgba(127, 212, 255, 0.25);
  --hud-radius: 8px;
  --hud-line: rgba(127, 212, 255, 0.2);
}

/* Base HUD canvas */
body {
  margin: 0;
  padding: 0;
  background: radial-gradient(circle at 20% 0%, #07101f 0, #020712 45%, #000 100%);
  color: var(--hud-text);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "SF Pro Text",
    "Segoe UI", sans-serif;
  overflow: hidden;
}

#hudRoot {
  position: relative;
  min-height: 100vh;
  padding: 24px;
  box-sizing: border-box;
  display: flex;
  flex-direction: column;
}

/* Holographic grid overlay */
.hud-grid {
  pointer-events: none;
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(to right, var(--hud-grid) 1px, transparent 1px),
    linear-gradient(to bottom, var(--hud-grid) 1px, transparent 1px);
  background-size: 40px 40px;
  mix-blend-mode: screen;
  opacity: 0.6;
  z-index: -3;
}

/* Subtle scanlines */
.hud-scanlines {
  pointer-events: none;
  position: fixed;
  inset: 0;
  background-image: linear-gradient(
    to bottom,
    rgba(255, 255, 255, 0.04) 1px,
    transparent 3px
  );
  background-size: 100% 4px;
  mix-blend-mode: soft-light;
  opacity: 0.35;
  z-index: -2;
}

/* Film grain */
.hud-grain {
  pointer-events: none;
  position: fixed;
  inset: -50px;
  background-image: repeating-radial-gradient(
    circle at 0 0,
    rgba(255, 255, 255, 0.05) 0,
    rgba(255, 255, 255, 0.05) 1px,
    transparent 1px,
    transparent 3px
  );
  opacity: 0.18;
  mix-blend-mode: soft-light;
  z-index: -1;
}

/* Soft vignette */
.hud-vignette {
  pointer-events: none;
  position: fixed;
  inset: 0;
  background: radial-gradient(circle at center, transparent 0, transparent 55%, rgba(0, 0, 0, 0.85) 100%);
  z-index: -1;
}

/* Header */
.hud-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
}

.hud-title {
  font-size: 1.1rem;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--hud-primary);
  text-shadow: 0 0 12px rgba(127, 212, 255, 0.7);
}

/* Panels */
.hub-container {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
  gap: 20px;
  height: calc(100vh - 80px);
}

.hub-panel {
  position: relative;
  background: var(--hud-panel-bg);
  border-radius: var(--hud-radius);
  border: 1px solid var(--hud-border);
  box-shadow: var(--hud-panel-glow);
  padding: 16px 18px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.hub-panel::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  border: 1px solid rgba(127, 212, 255, 0.12);
  pointer-events: none;
  mix-blend-mode: screen;
}

/* Panel title */
.panel-title {
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--hud-muted);
  margin: 0 0 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.panel-title::before {
  content: "";
  width: 32px;
  height: 1px;
  background: linear-gradient(to right, transparent, var(--hud-primary-soft));
}

/* Buttons */
.hud-button,
.tab,
.letter-btn,
.intel-btn,
.return-btn {
  position: relative;
  border-radius: var(--hud-radius);
  border: 1px solid var(--hud-border);
  background: radial-gradient(circle at top left, rgba(127, 212, 255, 0.18), rgba(4, 12, 24, 0.95));
  color: var(--hud-text);
  padding: 10px 14px;
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  cursor: pointer;
  margin-bottom: 8px;
  text-align: left;
  overflow: hidden;
  transition: border-color 0.15s ease, box-shadow 0.15s ease, transform 0.08s ease;
}

.hud-button::after,
.tab::after,
.letter-btn::after,
.intel-btn::after,
.return-btn::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    120deg,
    transparent 0%,
    rgba(255, 255, 255, 0.12) 40%,
    transparent 80%
  );
  opacity: 0;
  transform: translateX(-40%);
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.hud-button:hover,
.tab:hover,
.letter-btn:hover,
.intel-btn:hover,
.return-btn:hover {
  border-color: var(--hud-accent);
  box-shadow: 0 0 18px rgba(76, 240, 255, 0.35);
  transform: translateY(-1px);
}

.hud-button:hover::after,
.tab:hover::after,
.letter-btn:hover::after,
.intel-btn:hover::after,
.return-btn:hover::after {
  opacity: 1;
  transform: translateX(40%);
}

/* Return button */
.return-btn {
  min-width: 120px;
  text-align: center;
}

/* Intel list */
.intel-list {
  flex: 1;
  overflow-y: auto;
  padding-right: 4px;
}

/* Data widgets */
.data-widget {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 6px 0;
  border-bottom: 1px solid rgba(127, 212, 255, 0.12);
  font-size: 0.8rem;
}

.data-widget:last-child {
  border-bottom: none;
}

.data-widget .label {
  color: var(--hud-muted);
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

.data-widget .value {
  color: var(--hud-accent);
  font-variant-numeric: tabular-nums;
}

/* Small note text */
.hud-note {
  margin-top: 12px;
  font-size: 0.75rem;
  color: var(--hud-muted);
  line-height: 1.4;
}

/* Scrollbars */
.intel-list::-webkit-scrollbar {
  width: 6px;
}
.intel-list::-webkit-scrollbar-track {
  background: transparent;
}
.intel-list::-webkit-scrollbar-thumb {
  background: rgba(127, 212, 255, 0.35);
  border-radius: 3px;
}

/* Responsive */
@media (max-width: 900px) {
  .hub-container {
    grid-template-columns: minmax(0, 1fr);
    height: auto;
  }
}