/* ============ WELCOME / SPLASH PAGE ============ */

.welcome-body {
  overflow: hidden;
  height: 100vh;
  position: relative;
}

/* ---- Floating diamond background ---- */
.welcome-diamond-field {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
  opacity: 0;
  transition: opacity 1.1s ease;
}
.welcome-diamond-field.welcome-ready {
  opacity: 1;
}
.welcome-diamond-field.fading-out {
  opacity: 0;
  transition: opacity 0.6s ease;
}
.welcome-diamond-field .wd {
  position: absolute;
  border: 1px solid var(--border-soft);
  transform: rotate(45deg);
  animation: welcomeFloat linear infinite;
}
.welcome-diamond-field .wd.wd-strong {
  border-color: var(--border-strong);
}
.welcome-diamond-field .wd.wd-filled {
  background: var(--gold);
  border: none;
  opacity: 0.5;
}

@keyframes welcomeFloat {
  0%   { transform: rotate(45deg) translate(0, 0); }
  25%  { transform: rotate(45deg) translate(18px, -26px); }
  50%  { transform: rotate(45deg) translate(-12px, -44px); }
  75%  { transform: rotate(45deg) translate(-22px, -14px); }
  100% { transform: rotate(45deg) translate(0, 0); }
}

/* ---- Center stage ---- */
.welcome-stage {
  position: relative;
  z-index: 2;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px 24px;
}

.welcome-content {
  text-align: center;
  max-width: 640px;
  width: 100%;
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.9s ease, transform 0.9s ease;
}
.welcome-stage.welcome-ready .welcome-content {
  opacity: 1;
  transform: translateY(0);
}
.welcome-content.fading-out {
  opacity: 0;
  visibility: hidden;
  transform: translateY(-14px) scale(0.98);
  transition: opacity 0.3s ease, transform 0.3s ease, visibility 0s 0.3s;
}

.welcome-brand {
  margin-bottom: 6px;
}

.welcome-sub {
  font-size: 16px;
  color: var(--grey);
  letter-spacing: 0.02em;
  margin-bottom: 40px;
}

.welcome-lang-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}
.welcome-lang-btn {
  display: flex;
  align-items: center;
  gap: 10px;
  justify-content: center;
  background: var(--bg-panel);
  border: 1px solid rgba(255,255,255,0.12);
  color: var(--white);
  font-family: "Source Sans 3", sans-serif;
  font-size: 14px;
  font-weight: 600;
  padding: 14px 16px;
  cursor: pointer;
  transition: all 0.2s ease;
}
.welcome-lang-btn:hover {
  border-color: var(--gold);
  background: var(--bg-panel-2);
  color: var(--gold-bright);
  transform: translateY(-2px);
}
.welcome-flag {
  font-size: 18px;
}

@media (max-width: 760px) {
  .welcome-lang-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 420px) {
  .welcome-sub { font-size: 14px; margin-bottom: 28px; }
  .welcome-lang-btn { font-size: 13px; padding: 12px 10px; }
}

/* ---- Door transition ---- */
.welcome-doors {
  position: fixed;
  inset: 0;
  z-index: 10;
  display: flex;
  pointer-events: none;
  visibility: hidden;
}
.welcome-doors.opening {
  visibility: visible;
}
.welcome-door {
  flex: 1;
  height: 100%;
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, var(--bg-panel) 0%, var(--bg-void) 100%);
  border-top: 3px solid var(--gold);
  box-shadow: 0 0 60px rgba(0,0,0,0.6);
  transform: translateX(0);
}

/* Diamonds riding on each door panel — identical pattern/positions as the
   background field, re-anchored to each panel's own coordinate space, so
   they appear to travel away together with the doors when they open. */
.welcome-door-diamonds {
  position: absolute;
  inset: 0;
  pointer-events: none;
}
.welcome-door-diamonds .wd {
  position: absolute;
  border: 1px solid var(--border-soft);
  transform: rotate(45deg);
  animation: welcomeFloat linear infinite;
}
.welcome-door-diamonds .wd.wd-strong {
  border-color: var(--border-strong);
}
.welcome-door-diamonds .wd.wd-filled {
  background: var(--gold);
  border: none;
  opacity: 0.5;
}

.welcome-doors.opening .welcome-door-left {
  animation: welcomeDoorLeft 1.5s cubic-bezier(0.6, 0, 0.25, 1) forwards;
}
.welcome-doors.opening .welcome-door-right {
  animation: welcomeDoorRight 1.5s cubic-bezier(0.6, 0, 0.25, 1) forwards;
}

@keyframes welcomeDoorLeft {
  0%   { transform: translateX(0) scale(1); }
  30%  { transform: translateX(0) scale(1.03); }
  100% { transform: translateX(-100%) scale(1.03); }
}
@keyframes welcomeDoorRight {
  0%   { transform: translateX(0) scale(1); }
  30%  { transform: translateX(0) scale(1.03); }
  100% { transform: translateX(100%) scale(1.03); }
}

@media (prefers-reduced-motion: reduce) {
  .welcome-diamond-field .wd,
  .welcome-door-diamonds .wd {
    animation: none;
  }
  .welcome-diamond-field,
  .welcome-content {
    transition: none;
    opacity: 1;
    transform: none;
  }
  .welcome-doors.opening .welcome-door-left,
  .welcome-doors.opening .welcome-door-right {
    animation: none;
  }
}