/* ========== Loading screen ========== */
.loader {
  position: fixed;
  inset: 0;
  z-index: 99998;
  background: #050505;
  color: #fff;
  font-family: var(--font-mono);
  overflow: hidden;
  opacity: 1;
  transition: opacity .7s ease;
}
.loader.is-out { opacity: 0; pointer-events: none; }

/* 噪点 */
.loader::before {
  content: '';
  position: absolute; inset: 0;
  background-image:
    radial-gradient(rgba(255,255,255,0.04) 1px, transparent 1px);
  background-size: 4px 4px;
  pointer-events: none;
  opacity: 0.5;
}

/* ===== Wave (心电图) ===== */
.loader__wave {
  position: absolute;
  left: 0; right: 0;
  top: 50%;
  height: 110px;
  margin-top: -55px;
  overflow: hidden;
  pointer-events: none;
}
.loader__wave svg {
  width: 200%;
  height: 100%;
  display: block;
  animation: waveScroll 5.5s linear infinite;
}
.loader__wave path {
  fill: none;
  stroke: var(--accent);
  stroke-width: 1.4;
  stroke-linecap: round;
  stroke-linejoin: round;
  filter: drop-shadow(0 0 5px rgba(230,57,70,0.55));
}
@keyframes waveScroll {
  from { transform: translateX(0); }
  to   { transform: translateX(-50%); }
}

/* ===== Center box ===== */
.loader__center {
  position: relative;
  z-index: 2;
  text-align: center;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 0 40px;
}
.loader__freq {
  font-size: 10px;
  color: var(--accent);
  letter-spacing: 0.22em;
  margin-bottom: 14px;
  opacity: 0.85;
}
.loader__title {
  display: inline-block;
  border: 1px solid rgba(255,255,255,0.4);
  padding: 9px 26px;
  font-size: 12px;
  letter-spacing: 0.28em;
  color: #fff;
  background: rgba(5,5,5,0.85);
  margin-bottom: 36px;
  position: relative;
  white-space: nowrap;
}
.loader__title::after {
  content: '';
  position: absolute;
  right: 12px; top: 50%;
  width: 6px; height: 6px;
  background: var(--accent);
  border-radius: 50%;
  transform: translateY(-50%);
  animation: blink 1.2s infinite;
}
.loader__pct {
  font-family: 'Inter', -apple-system, sans-serif;
  font-size: clamp(56px, 8vw, 96px);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.02em;
  color: #fff;
  text-shadow: 0 0 20px rgba(255,255,255,0.15);
}

/* ===== HUD top-right ===== */
.loader__hud-tr {
  position: absolute;
  top: 32px; right: 32px;
  text-align: right;
  font-size: 10px;
  color: rgba(255,255,255,0.55);
  letter-spacing: 0.18em;
  z-index: 3;
}
.loader__pulse {
  width: 46px; height: 46px;
  margin-left: auto;
  margin-bottom: 14px;
  position: relative;
}
.loader__pulse svg { width: 100%; height: 100%; }
.loader__pulse .ring { fill: none; stroke: rgba(255,255,255,0.15); stroke-width: 1.2; }
.loader__pulse .arc {
  fill: var(--accent);
  transform-origin: center;
  animation: pulseRotate 1.8s linear infinite;
}
@keyframes pulseRotate {
  to { transform: rotate(360deg); }
}
.loader__lat { margin-bottom: 8px; }
.loader__encrypted {
  display: inline-block;
  border: 1px solid var(--accent);
  color: var(--accent);
  padding: 4px 11px;
  margin-bottom: 14px;
  letter-spacing: 0.22em;
}
.loader__matrix {
  font-size: 10px;
  color: rgba(255,255,255,0.22);
  line-height: 1.85;
  font-variant-numeric: tabular-nums;
}
.loader__matrix span { display: block; }

/* ===== Log bottom-left ===== */
.loader__log {
  position: absolute;
  bottom: 36px; left: 36px;
  font-size: 11px;
  color: rgba(255,255,255,0.55);
  letter-spacing: 0.12em;
  border-left: 1.5px solid var(--accent);
  padding: 4px 0 4px 14px;
  z-index: 3;
}
.loader__log .line {
  opacity: 0;
  transform: translateY(4px);
  transition: opacity .35s, transform .35s, color .35s;
  margin-bottom: 6px;
  display: block;
}
.loader__log .line.is-show {
  opacity: 0.55;
  transform: translateY(0);
}
.loader__log .line.is-now {
  opacity: 1;
  color: #fff;
}
.loader__log .arr { color: var(--accent); margin-right: 8px; }

/* ===== Coord square (right middle) ===== */
.loader__coord {
  position: absolute;
  right: 13%;
  top: calc(50% + 20px);
  font-size: 10px;
  color: var(--accent);
  letter-spacing: 0.1em;
  z-index: 3;
  pointer-events: none;
}
.loader__coord-sq {
  width: 8px; height: 8px;
  background: var(--accent);
  margin-bottom: 8px;
}

/* responsive */
@media (max-width: 720px) {
  .loader__hud-tr { font-size: 9px; top: 16px; right: 16px; }
  .loader__pulse { width: 36px; height: 36px; }
  .loader__log { left: 16px; bottom: 20px; font-size: 10px; }
  .loader__coord { right: 8%; }
}