/* ──────────────────────────────────────────────────────────────────────────
   Opening sequence.

   A boot animation on a security console has one hard requirement that
   outranks how it looks: it must never be able to trap the operator behind it.
   Three independent things have to fail before that can happen.

     1. The overlay animates itself out. The fade is a CSS animation with
        `forwards` fill, so it clears even if no script ever runs.
     2. `pointer-events: none` from the very first frame. Even mid-animation
        the dashboard underneath stays clickable.
     3. intro.js removes the node afterwards, and has its own timeout.

   Belt, braces and a third thing, because the failure mode is a security tool
   that cannot be operated during an incident.

   The whole sequence is ~1.9s and plays on arrival — the front door, and the
   first dashboard after signing in — not on every sidebar click. intro.js owns
   that rule.
   ────────────────────────────────────────────────────────────────────────── */

.intro {
  position: fixed;
  inset: 0;
  z-index: 9999;
  display: grid;
  place-items: center;
  background:
    radial-gradient(900px 520px at 50% 44%, rgba(47, 224, 138, 0.08), transparent 68%),
    var(--bg, #07090a);
  pointer-events: none;              /* never blocks the app underneath */
  animation: intro-out 620ms cubic-bezier(0.65, 0, 0.35, 1) 1280ms forwards;
  will-change: opacity, transform;
}

/* Faint grid, so the wordmark lands on a surface rather than in a void. */
.intro::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(47, 224, 138, 0.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(47, 224, 138, 0.055) 1px, transparent 1px);
  background-size: 46px 46px;
  mask-image: radial-gradient(circle at 50% 46%, #000 12%, transparent 62%);
  -webkit-mask-image: radial-gradient(circle at 50% 46%, #000 12%, transparent 62%);
  opacity: 0;
  animation: intro-grid 900ms ease-out 60ms forwards;
}

.intro-stage {
  position: relative;
  display: grid;
  place-items: center;
  width: min(560px, 84vw);
  height: min(560px, 84vw);
}

/* ── radar ─────────────────────────────────────────────────────────────── */
.intro-radar {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
}

.intro-ring {
  position: absolute;
  border: 1px solid rgba(47, 224, 138, 0.22);
  border-radius: 50%;
  opacity: 0;
  transform: scale(0.4);
  animation: intro-ring 1100ms cubic-bezier(0.16, 1, 0.3, 1) forwards;
}
.intro-ring.r1 { width: 26%;  height: 26%;  animation-delay: 40ms; }
.intro-ring.r2 { width: 50%;  height: 50%;  animation-delay: 130ms; }
.intro-ring.r3 { width: 74%;  height: 74%;  animation-delay: 220ms; border-color: rgba(47,224,138,0.14); }
.intro-ring.r4 { width: 98%;  height: 98%;  animation-delay: 310ms; border-color: rgba(47,224,138,0.08); }

/* The sweep. One rotation, then it stops — a looping radar would imply the
   console is still waiting on something. */
.intro-sweep {
  position: absolute;
  width: 98%;
  height: 98%;
  border-radius: 50%;
  background: conic-gradient(
    from 0deg,
    rgba(47, 224, 138, 0.30) 0deg,
    rgba(47, 224, 138, 0.10) 26deg,
    transparent 62deg,
    transparent 360deg
  );
  mask-image: radial-gradient(circle, transparent 12%, #000 13%, #000 100%);
  -webkit-mask-image: radial-gradient(circle, transparent 12%, #000 13%, #000 100%);
  opacity: 0;
  transform: rotate(-90deg);
  animation: intro-sweep 1250ms cubic-bezier(0.4, 0, 0.2, 1) 120ms forwards;
}

/* Nodes the sweep "finds". Staggered so they read as detections landing. */
.intro-node {
  position: absolute;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--green, #2fe08a);
  box-shadow: 0 0 0 0 rgba(47, 224, 138, 0.45);
  opacity: 0;
  animation: intro-node 760ms cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

/* ── wordmark ──────────────────────────────────────────────────────────── */
.intro-mark {
  position: relative;
  text-align: center;
  z-index: 2;
}

.intro-word {
  display: flex;
  justify-content: center;
  gap: clamp(2px, 0.8vw, 7px);
  font-family: var(--sans, "Inter", sans-serif);
  font-weight: 800;
  font-size: clamp(46px, 11vw, 108px);
  letter-spacing: clamp(1px, 0.5vw, 6px);
  line-height: 1;
  color: var(--text, #e7eef1);
}

/* Each glyph rises through its own clip window. Individually animated so the
   wordmark assembles rather than simply appearing. */
.intro-ch {
  display: block;
  transform: translateY(115%);
  animation: intro-ch 900ms cubic-bezier(0.16, 1, 0.3, 1) forwards;
}
.intro-clip { overflow: hidden; display: block; }

.intro-word .accent { color: var(--green, #2fe08a); }

/* Rule that draws out from the centre under the wordmark. */
.intro-rule {
  height: 2px;
  margin: clamp(10px, 1.8vw, 20px) auto 0;
  width: 0;
  background: linear-gradient(90deg,
    transparent, var(--green, #2fe08a) 22%, var(--green, #2fe08a) 78%, transparent);
  box-shadow: 0 0 18px rgba(47, 224, 138, 0.5);
  animation: intro-rule 700ms cubic-bezier(0.16, 1, 0.3, 1) 480ms forwards;
}

.intro-sub {
  margin-top: clamp(9px, 1.5vw, 15px);
  font-family: var(--mono, monospace);
  font-size: clamp(9px, 1.15vw, 12px);
  letter-spacing: clamp(2px, 0.7vw, 6px);
  text-transform: uppercase;
  color: var(--muted, #6d7d85);
  opacity: 0;
  animation: intro-sub 620ms ease-out 700ms forwards;
}

/* ── keyframes ─────────────────────────────────────────────────────────── */
@keyframes intro-grid {
  to { opacity: 1; }
}

@keyframes intro-ring {
  0%   { opacity: 0; transform: scale(0.45); }
  55%  { opacity: 1; }
  100% { opacity: 1; transform: scale(1); }
}

@keyframes intro-sweep {
  0%   { opacity: 0; transform: rotate(-90deg); }
  12%  { opacity: 1; }
  85%  { opacity: 1; }
  100% { opacity: 0; transform: rotate(280deg); }
}

@keyframes intro-node {
  0%   { opacity: 0; transform: scale(0.2); box-shadow: 0 0 0 0 rgba(47,224,138,0.5); }
  45%  { opacity: 1; transform: scale(1.5); }
  100% { opacity: 0.85; transform: scale(1); box-shadow: 0 0 0 9px rgba(47,224,138,0); }
}

@keyframes intro-ch {
  0%   { transform: translateY(115%); }
  100% { transform: translateY(0); }
}

@keyframes intro-rule {
  0%   { width: 0; }
  100% { width: min(360px, 62vw); }
}

@keyframes intro-sub {
  0%   { opacity: 0; letter-spacing: clamp(6px, 1.6vw, 14px); }
  100% { opacity: 1; }
}

/* Lifts and dissolves, so the dashboard reads as arriving underneath rather
   than the overlay merely switching off. */
@keyframes intro-out {
  0%   { opacity: 1; transform: scale(1); filter: blur(0); }
  100% { opacity: 0; transform: scale(1.06); filter: blur(7px); visibility: hidden; }
}

/* ── reduced motion ────────────────────────────────────────────────────── */
/* Someone who has asked their OS for less motion gets the wordmark, held
   briefly, then a plain fade. No sweep, no travel, no blur. The branding still
   happens; the vestibular trigger does not. */
@media (prefers-reduced-motion: reduce) {
  .intro { animation: intro-out-reduced 380ms ease-out 620ms forwards; }
  .intro::before,
  .intro-sweep,
  .intro-node { display: none; }
  .intro-ring { opacity: 1; transform: scale(1); animation: none; }
  .intro-ch { transform: none; animation: none; }
  .intro-rule { width: min(360px, 62vw); animation: none; }
  .intro-sub { opacity: 1; animation: none; }

  @keyframes intro-out-reduced {
    to { opacity: 0; visibility: hidden; }
  }
}