/* ===== Design Tokens ===== */
:root {
  /* Backgrounds */
  --ss-bg-panel:    rgba(6, 14, 26, 0.88);
  --ss-bg-strong:   rgba(6, 14, 26, 0.96);
  --ss-bg-inset:    rgba(255, 255, 255, 0.03);
  --ss-bg-hover:    rgba(255, 255, 255, 0.06);

  /* Borders */
  --ss-line:        rgba(0, 180, 255, 0.14);
  --ss-line-mid:    rgba(0, 180, 255, 0.28);
  --ss-line-strong: rgba(0, 180, 255, 0.52);
  --ss-line-muted:  rgba(255, 255, 255, 0.07);

  /* Colors */
  --ss-blue:   #00b4ff;
  --ss-teal:   #00ffcc;
  --ss-amber:  #ffb940;
  --ss-red:    #ff4d4d;

  /* Text */
  --ss-text:   #e8f4ff;
  --ss-soft:   #7fa8c4;
  --ss-accent: var(--ss-blue);

  /* Glows */
  --ss-glow-blue:  rgba(0, 180, 255, 0.35);
  --ss-glow-teal:  rgba(0, 255, 204, 0.28);
  --ss-glow-amber: rgba(255, 185, 64, 0.40);

  /* Shadows */
  --ss-shadow-sm: 0 4px 16px rgba(0, 0, 0, 0.40);
  --ss-shadow-md: 0 12px 32px rgba(0, 0, 0, 0.50);
  --ss-shadow-lg: 0 22px 48px rgba(0, 0, 0, 0.55);

  /* Shape */
  --ss-radius-sm:   8px;
  --ss-radius-md:  14px;
  --ss-radius-lg:  22px;
  --ss-radius-pill: 999px;

  /* Fonts */
  --ss-font-display: "Orbitron", "Arial Narrow", sans-serif;
  --ss-font-mono:    "Space Mono", "Courier New", monospace;
  --ss-font-sans:    "IBM Plex Sans", "Segoe UI", sans-serif;

  /* Motion */
  --ss-dur-fast:  100ms;
  --ss-dur-mid:   180ms;
  --ss-dur-slow:  320ms;
  --ss-ease:      cubic-bezier(0.2, 0, 0, 1);
}

/* ===== Base ===== */
html, body {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: #000508;
  font-family: var(--ss-font-sans);
  color: var(--ss-text);
}

#c {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  touch-action: none;
}

a { color: var(--ss-blue); }

/* ===== Shared panel style ===== */
#ui,
#hud,
#attribution {
  background:
    repeating-linear-gradient(0deg, transparent, transparent 3px, rgba(0,0,0,0.04) 3px, rgba(0,0,0,0.04) 4px),
    linear-gradient(135deg, rgba(0,180,255,0.06) 0%, transparent 50%),
    var(--ss-bg-panel);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  backdrop-filter: blur(20px) saturate(180%);
  border: 1px solid var(--ss-line);
  box-shadow: var(--ss-shadow-md), inset 0 1px 0 rgba(255,255,255,0.06);
}

/* ===== Corner bracket pseudo-elements ===== */
#ui::before, #ui::after,
#hud::before, #hud::after {
  content: "";
  position: absolute;
  width: 14px;
  height: 14px;
  pointer-events: none;
  z-index: 1;
}

#ui::before, #hud::before {
  top: -1px;
  left: -1px;
  border-top: 2px solid var(--ss-blue);
  border-left: 2px solid var(--ss-blue);
  border-top-left-radius: var(--ss-radius-sm);
}

#ui::after, #hud::after {
  bottom: -1px;
  right: -1px;
  border-bottom: 2px solid var(--ss-blue);
  border-right: 2px solid var(--ss-blue);
  border-bottom-right-radius: var(--ss-radius-sm);
}

/* ===== #ui panel (top-left controls) ===== */
#ui {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 10;
  border-radius: var(--ss-radius-lg);
  padding: 12px 12px 10px;
  max-width: min(520px, calc(100vw - 24px));
}

#ui .row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 6px 0;
  flex-wrap: wrap;
}

#ui label {
  font-size: 13px;
  color: var(--ss-soft);
}

/* Select dropdown */
#ui select {
  -webkit-appearance: none;
  appearance: none;
  min-width: 180px;
  max-width: 320px;
  padding: 7px 32px 7px 10px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%2300b4ff' stroke-width='1.5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 10px center;
  background-color: rgba(0, 30, 60, 0.80);
  color: var(--ss-text);
  border: 1px solid var(--ss-line-mid);
  border-radius: var(--ss-radius-sm);
  font-family: var(--ss-font-sans);
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  transition: border-color var(--ss-dur-fast) var(--ss-ease), box-shadow var(--ss-dur-fast) var(--ss-ease);
}

#ui select:focus {
  outline: none;
  border-color: var(--ss-blue);
  box-shadow: 0 0 0 2px rgba(0, 180, 255, 0.20);
}

/* Buttons */
#ui button {
  font-family: var(--ss-font-sans);
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.10em;
  padding: 7px 12px;
  border-radius: var(--ss-radius-sm);
  border: 1px solid var(--ss-line-mid);
  background: linear-gradient(180deg, rgba(0,100,180,0.18), rgba(0,50,100,0.12));
  color: var(--ss-text);
  cursor: pointer;
  transition: border-color var(--ss-dur-fast) var(--ss-ease), box-shadow var(--ss-dur-fast) var(--ss-ease);
}

#ui button:hover {
  border-color: var(--ss-line-strong);
  box-shadow: 0 0 10px -2px var(--ss-glow-blue);
}

#ui button:active {
  transform: scale(0.97);
}

/* Toggle switches (custom checkboxes) */
.ui-toggle {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  -webkit-user-select: none;
  user-select: none;
  font-size: 12px;
  color: var(--ss-soft);
}

.ui-toggle input[type="checkbox"] {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
  pointer-events: none;
}

.ui-toggle span {
  position: relative;
  padding-left: 38px;
  line-height: 20px;
  transition: color var(--ss-dur-fast) var(--ss-ease);
}

.ui-toggle span::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 30px;
  height: 16px;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--ss-line-muted);
  transition: background var(--ss-dur-fast) var(--ss-ease), border-color var(--ss-dur-fast) var(--ss-ease), box-shadow var(--ss-dur-fast) var(--ss-ease);
}

.ui-toggle span::after {
  content: "";
  position: absolute;
  left: 3px;
  top: 50%;
  transform: translateY(-50%);
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--ss-soft);
  transition: transform var(--ss-dur-fast) var(--ss-ease), background var(--ss-dur-fast) var(--ss-ease), box-shadow var(--ss-dur-fast) var(--ss-ease);
}

.ui-toggle input:checked + span {
  color: var(--ss-text);
}

.ui-toggle input:checked + span::before {
  background: rgba(0, 255, 204, 0.20);
  border-color: var(--ss-teal);
  box-shadow: 0 0 8px -1px var(--ss-glow-teal);
}

.ui-toggle input:checked + span::after {
  transform: translateY(-50%) translateX(14px);
  background: var(--ss-teal);
  box-shadow: 0 0 6px var(--ss-glow-teal);
}

.ui-toggle input:focus-visible + span::before {
  outline: 2px solid var(--ss-blue);
  outline-offset: 2px;
}

/* Range slider */
#ui input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 4px;
  border-radius: 2px;
  background: linear-gradient(90deg,
    var(--ss-blue) 0%,
    var(--ss-blue) var(--pct, 5%),
    rgba(255,255,255,0.10) var(--pct, 5%),
    rgba(255,255,255,0.10) 100%
  );
  outline: none;
  cursor: pointer;
}

#ui input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--ss-blue);
  border: 2px solid rgba(0, 180, 255, 0.6);
  box-shadow: 0 0 10px var(--ss-glow-blue);
  cursor: pointer;
}

#ui input[type="range"]::-moz-range-thumb {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--ss-blue);
  border: 2px solid rgba(0, 180, 255, 0.6);
  box-shadow: 0 0 10px var(--ss-glow-blue);
  cursor: pointer;
}

#timeScaleValue {
  font-family: var(--ss-font-mono);
  font-size: 12px;
  font-weight: 700;
  color: var(--ss-amber);
  min-width: 40px;
  text-align: right;
}

/* Help details */
#ui .help {
  margin-top: 6px;
  font-size: 12px;
  color: var(--ss-soft);
}

#ui .help summary {
  cursor: pointer;
  color: var(--ss-soft);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.10em;
}

#ui ul {
  margin: 6px 0 0 18px;
  padding: 0;
  font-size: 12px;
  color: var(--ss-soft);
  line-height: 1.6;
}

/* ===== #hud (bottom-left telemetry) ===== */
#hud {
  position: fixed;
  bottom: 12px;
  left: 12px;
  z-index: 10;
  border-radius: var(--ss-radius-lg);
  padding: 12px 16px;
  font-size: 12px;
  line-height: 1.7;
  max-width: min(320px, calc(100vw - 24px));
}

/* HUD header (SYS LIVE) */
.hud-header {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 8px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--ss-line);
}

.hud-sys, .hud-live {
  font-family: var(--ss-font-mono);
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.2em;
}

.hud-sys  { color: var(--ss-soft); }
.hud-live { color: var(--ss-teal); }

.hud-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--ss-teal);
  box-shadow: 0 0 8px var(--ss-glow-teal);
  animation: hud-pulse 2s ease-in-out infinite;
}

@keyframes hud-pulse {
  0%, 100% { opacity: 1; box-shadow: 0 0 8px var(--ss-glow-teal); }
  50%      { opacity: 0.35; box-shadow: 0 0 4px var(--ss-glow-teal); }
}

/* HUD data rows */
#hud > div:not(.hud-header) {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  padding: 3px 0;
}

#hud .k {
  font-size: 9px;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--ss-soft);
  white-space: nowrap;
  flex: 0 0 auto;
}

#hudTarget,
#hudDistance,
#hudScale {
  font-family: var(--ss-font-mono);
  font-size: 12px;
  font-weight: 700;
  color: var(--ss-blue);
  text-align: right;
  letter-spacing: 0.04em;
}

#hudTarget {
  color: var(--ss-amber);
}

/* ===== #attribution (bottom-right) ===== */
#attribution {
  position: fixed;
  right: 12px;
  bottom: 12px;
  z-index: 10;
  border-radius: var(--ss-radius-md);
  padding: 8px 12px;
  font-size: 11px;
  line-height: 1.4;
  max-width: min(400px, calc(100vw - 24px));
  text-align: right;
  opacity: 0.5;
  border-color: var(--ss-line-muted);
  transition: opacity var(--ss-dur-mid) var(--ss-ease);
}

#attribution:hover {
  opacity: 1;
}

#attribution .small {
  color: var(--ss-soft);
  font-size: 10px;
}

/* ===== Glow pulse animation (reusable) ===== */
@keyframes ss-glow-pulse {
  0%, 100% { box-shadow: 0 0 12px -4px var(--ss-glow-blue); }
  50%      { box-shadow: 0 0 20px -2px var(--ss-glow-blue); }
}

/* ===== Responsive ===== */
@media (max-width: 720px) {
  #ui {
    top: 8px;
    left: 8px;
    padding: 10px 10px 8px;
    max-width: calc(100vw - 16px);
    border-radius: var(--ss-radius-md);
    -webkit-backdrop-filter: blur(12px);
    backdrop-filter: blur(12px);
  }

  #ui::before, #ui::after,
  #hud::before, #hud::after {
    width: 10px;
    height: 10px;
  }

  #hud {
    bottom: 8px;
    left: 8px;
    padding: 10px 12px;
    max-width: calc(100vw - 16px);
    border-radius: var(--ss-radius-md);
    -webkit-backdrop-filter: blur(12px);
    backdrop-filter: blur(12px);
  }

  #attribution {
    display: none;
  }

  .ui-toggle span {
    font-size: 11px;
    padding-left: 34px;
  }

  .ui-toggle span::before {
    width: 26px;
    height: 14px;
    border-radius: 7px;
  }

  .ui-toggle span::after {
    width: 8px;
    height: 8px;
    left: 3px;
  }

  .ui-toggle input:checked + span::after {
    transform: translateY(-50%) translateX(12px);
  }
}