/* ═══════════════════════════════════════
   INTRO — French door entrance
   ═══════════════════════════════════════ */

.intro {
  position: fixed;
  inset: 0;
  z-index: 1000;
  background: transparent; /* panels cover 100% when closed; transparent lets home content show through as they retract */
  cursor: default;
  overflow: hidden;
}

/* ── Two door panels ── */
.intro__panel {
  position: absolute;
  top: 0;
  bottom: 0;
  width: 50%;
  overflow: hidden;
  background: #000; /* fallback during initial load */
  /* Constant linear speed — duration matches door-open audio (5.75s) */
  transition: transform 5.75s linear;
  will-change: transform;
}

.intro__panel--left  { left: 0; }
.intro__panel--right { right: 0; }

.intro--opening .intro__panel--left  { transform: translateX(-100%); }
.intro--opening .intro__panel--right { transform: translateX(100%); }

/* ── Gear backgrounds — two layers crossfading gold ↔ silver ── */
.intro__panel-bg {
  position: absolute;
  top: -40%;
  bottom: -40%;
  width: 100vw;
  background-size: cover;
  background-position: center;
  animation: gear-rotate 180s linear infinite;
}

.intro__panel--left .intro__panel-bg {
  left: 0;
  transform-origin: 50vw 50%;
}

.intro__panel--right .intro__panel-bg {
  left: -50vw;
  transform-origin: 50vw 50%;
}

/* Gold (Gears1) — always visible underneath */
.intro__panel-bg--gold {
  background-image: url('/assets/Gears1.webp');
  opacity: 0.9;
  z-index: 0;
}

/* Silver (Gears2) — fades in over gold, then back out, loops */
.intro__panel-bg--silver {
  background-image: url('/assets/Gears2.webp');
  z-index: 1;
  opacity: 0;
  animation: gear-rotate 180s linear infinite,
             gold-to-silver 14s ease-in-out infinite;
}

/* Dark vignette — heavier toward center so initials pop */
.intro__panel--left::after,
.intro__panel--right::after {
  content: '';
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 1;
}

.intro__panel--left::after {
  background: linear-gradient(to right,
    rgba(0,0,0,0.6) 0%,
    rgba(0,0,0,0.1) 55%,
    rgba(0,0,0,0.55) 100%
  );
}

.intro__panel--right::after {
  background: linear-gradient(to left,
    rgba(0,0,0,0.6) 0%,
    rgba(0,0,0,0.1) 55%,
    rgba(0,0,0,0.55) 100%
  );
}

/* ── Vertical seam line ── */
.intro__seam {
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 1px;
  background: linear-gradient(
    to bottom,
    transparent 0%,
    rgba(0, 229, 255, 0.15) 15%,
    rgba(0, 229, 255, 0.35) 50%,
    rgba(0, 229, 255, 0.15) 85%,
    transparent 100%
  );
  z-index: 10;
  pointer-events: none;
  transition: opacity 0.6s linear;
}

.intro--glow-fade .intro__seam {
  opacity: 0;
}

/* ── Centered content — click target for opening doors ── */
.intro__content {
  position: absolute;
  inset: 0;
  z-index: 20;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  pointer-events: none; /* outer layer stays pass-through */
  gap: var(--space-3);
}

/* Only the monogram + text lines are interactive */
.intro__monogram,
.intro__tagline,
.intro__enter {
  pointer-events: auto;
}

/* ── Monogram: black letters, cyan glow ── */
.intro__monogram {
  display: flex;
  align-items: flex-start;
  line-height: 1;
  gap: 0.06em;
}

.intro__s,
.intro__r {
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 500;
  font-size: clamp(8rem, 22vw, 18rem);
  line-height: 1;
  display: inline-block;
  color: #000;
  /* Cyan glow radiates outward from the black letters */
  text-shadow:
    0 0 12px #00e5ff,
    0 0 30px #00e5ff,
    0 0 60px #00c8e0,
    0 0 120px rgba(0, 180, 220, 0.6);
  /* Glow fades from halfway point — duration matches remaining door travel */
  transition: text-shadow 1.2s linear;
}

.intro__s {
  transform: translateY(-0.14em);
}

/* When glow-fade triggers: cyan vanishes, black on black = invisible */
.intro--glow-fade .intro__s,
.intro--glow-fade .intro__r {
  text-shadow:
    0 0 0px transparent,
    0 0 0px transparent,
    0 0 0px transparent,
    0 0 0px transparent;
}

/* ── Primary identity line: Possible · Honest · Right ── */
.intro__tagline {
  font-family: var(--font-mono);
  font-size: calc(1.8rem - 2px);
  letter-spacing: 0.35em;
  text-transform: uppercase;
  color: #00e5ff;
  text-shadow: 0 0 12px rgba(0, 229, 255, 0.7);
  transition: opacity 0.8s linear;
  padding-left: 0.4em; /* optical balance for letter-spacing */
  cursor: pointer;
}

/* ── Secondary action line: Enter ── */
.intro__enter {
  font-family: var(--font-mono);
  font-size: 1.2rem;
  letter-spacing: 0.5em;
  text-transform: uppercase;
  color: rgba(0, 229, 255, 0.42);
  transition: opacity 0.8s linear, color 0.25s ease;
  margin-top: calc(var(--space-3) * 1.5);
  padding-left: 0.5em;
  cursor: pointer;
}

.intro__enter:hover {
  color: rgba(0, 229, 255, 0.75);
}

.intro--glow-fade .intro__tagline,
.intro--glow-fade .intro__enter {
  opacity: 0;
}