.auth-shell {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 1fr;
}

@media (min-width: 1024px) {
  .auth-shell {
    grid-template-columns: 1fr 1fr;
  }
}

.auth-side {
  display: none;
  align-items: center;
  justify-content: center;
  padding: 2.5rem;
}

@media (min-width: 1024px) {
  .auth-side {
    display: flex;
  }
}

.auth-content {
  max-width: 28rem;
}

.auth-panel {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
}

.auth-form-wrap {
  width: 100%;
  max-width: 28rem;
}

.auth-kicker {
  font-size: 0.68rem;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: #a1a1aa;
}

.auth-title {
  margin-top: 0.7rem;
  font-size: 2rem;
  line-height: 1.15;
  font-weight: 600;
}

.auth-subtitle {
  margin-top: 0.55rem;
  color: #a1a1aa;
  font-size: 0.875rem;
}

.auth-form {
  margin-top: 1.2rem;
  border-radius: 1rem;
  border: 1px solid #27272a;
  background: rgba(24, 24, 27, 0.35);
  padding: 1.25rem;
}

/* Login-only animated maroon/green gradient background */
.auth-login-bg {
  position: relative;
  overflow: hidden;
}

.auth-login-bg::before {
  content: "";
  position: fixed;
  inset: -35%;
  z-index: -2;
  background:
    radial-gradient(circle at 12% 22%, rgba(111, 29, 45, 0.86), transparent 33%),
    radial-gradient(circle at 86% 78%, rgba(21, 128, 61, 0.84), transparent 33%),
    radial-gradient(circle at 74% 16%, rgba(136, 19, 55, 0.72), transparent 30%),
    radial-gradient(circle at 22% 88%, rgba(22, 163, 74, 0.74), transparent 33%),
    radial-gradient(circle at 52% 52%, rgba(16, 185, 129, 0.28), transparent 44%),
    #09090b;
  background-size: 185% 185%;
  animation: authGradientFlow 4.8s linear infinite alternate;
  filter: saturate(1.38) contrast(1.12) brightness(1.07);
  will-change: transform, filter, background-position;
}

.auth-login-bg::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background: linear-gradient(to bottom, rgba(9, 9, 11, 0.35), rgba(9, 9, 11, 0.7));
}

.interactive-bg {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 0; 
  pointer-events: none;
  background-image: url('/assets/bg.png');
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  opacity: 0;
  transition: opacity 0.5s ease-out;
  filter: saturate(1.2) contrast(1.1) brightness(0.8);
  -webkit-mask-image: radial-gradient(circle 180px at var(--mouse-x, 50%) var(--mouse-y, 50%), black 40%, rgba(0,0,0,0.8) 60%, transparent 100%);
  mask-image: radial-gradient(circle 180px at var(--mouse-x, 50%) var(--mouse-y, 50%), black 40%, rgba(0,0,0,0.8) 60%, transparent 100%);
}

@keyframes authGradientFlow {
  0% {
    transform: translate3d(-8%, -6%, 0) scale(1.08) rotate(0deg);
    background-position: 0% 0%;
    filter: hue-rotate(0deg) saturate(1.3) brightness(1.05);
  }
  50% {
    transform: translate3d(8%, -2%, 0) scale(1.12) rotate(1deg);
    background-position: 60% 40%;
    filter: hue-rotate(-6deg) saturate(1.45) brightness(1.12);
  }
  100% {
    transform: translate3d(-4%, 8%, 0) scale(1.1) rotate(-1deg);
    background-position: 100% 100%;
    filter: hue-rotate(4deg) saturate(1.36) brightness(1.08);
  }
}

.auth-links {
  margin-top: 1rem;
  display: flex;
  justify-content: space-between;
  font-size: 0.75rem;
  color: #a1a1aa;
}

.auth-links a,
.auth-foot a {
  color: #e4e4e7;
  text-decoration: none;
}

.auth-links a:hover,
.auth-foot a:hover {
  text-decoration: underline;
}

.auth-foot {
  margin-top: 1rem;
  text-align: center;
  font-size: 0.75rem;
  color: #a1a1aa;
}

.auth-copyright {
  margin-top: 1.2rem;
  text-align: center;
  font-size: 0.75rem;
  color: #71717a;
}

.auth-feature-grid {
  margin-top: 1.6rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}

.auth-feature {
  border-radius: 0.75rem;
  border: 1px solid #27272a;
  background: rgba(24, 24, 27, 0.2);
  padding: 0.9rem;
  font-size: 0.75rem;
  color: #a1a1aa;
}

/* Logo Collision Animation */
.logo-collision-wrapper {
  position: relative;
  width: 100%;
  height: 200px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 2rem;
  overflow: visible;
}

.logo-bsit, .logo-cs {
  position: absolute;
  width: 90px;
  height: 90px;
  object-fit: contain;
  filter: drop-shadow(0 15px 25px rgba(0,0,0,0.6));
  animation-duration: 9s;
  animation-iteration-count: infinite;
  animation-timing-function: cubic-bezier(0.34, 1.56, 0.64, 1);
  z-index: 2;
}

.logo-bsit {
  left: 10%;
  animation-name: collideLeft;
}

.logo-cs {
  right: 10%;
  animation-name: collideRight;
}

.collision-flash {
  position: absolute;
  width: 10px;
  height: 10px;
  background: #fef3c7;
  border-radius: 50%;
  box-shadow: 0 0 80px 60px rgba(253, 230, 138, 0.9),
              0 0 150px 100px rgba(245, 158, 11, 0.7),
              0 0 200px 150px rgba(217, 119, 6, 0.5);
  opacity: 0;
  animation: flashBurst 9s infinite ease-out;
  z-index: 1;
}

.logo-ccs {
  position: absolute;
  width: 170px;
  height: 170px;
  object-fit: contain;
  opacity: 0;
  animation: revealCCS 9s infinite ease-out;
  z-index: 3;
  filter: drop-shadow(0 15px 30px rgba(245, 158, 11, 0.4));
}

.collision-particles {
  position: absolute;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

@keyframes collideLeft {
  0%, 5% { transform: translateX(0) scale(0.8) rotate(-15deg); opacity: 0; filter: drop-shadow(0 0 20px rgba(159, 18, 57, 0.5)); }
  10% { opacity: 1; }
  22% { transform: translateX(110%) scale(1.1) rotate(10deg); filter: drop-shadow(0 0 30px rgba(159, 18, 57, 0.8)); } /* Impact point */
  25%, 100% { transform: translateX(110%) scale(1.3) rotate(15deg); opacity: 0; } /* Disappear into flash */
}

@keyframes collideRight {
  0%, 5% { transform: translateX(0) scale(0.8) rotate(15deg); opacity: 0; filter: drop-shadow(0 0 20px rgba(22, 163, 74, 0.5)); }
  10% { opacity: 1; }
  22% { transform: translateX(-110%) scale(1.1) rotate(-10deg); filter: drop-shadow(0 0 30px rgba(22, 163, 74, 0.8)); } /* Impact point */
  25%, 100% { transform: translateX(-110%) scale(1.3) rotate(-15deg); opacity: 0; } /* Disappear into flash */
}

@keyframes flashBurst {
  0%, 21% { opacity: 0; transform: scale(0); }
  22% { opacity: 1; transform: scale(1.5); }
  28% { opacity: 0.8; transform: scale(3); }
  45% { opacity: 0; transform: scale(4); }
  100% { opacity: 0; }
}

@keyframes revealCCS {
  0%, 22% { opacity: 0; transform: scale(0.5) translateY(20px); filter: blur(10px); }
  25% { opacity: 1; transform: scale(1.1) translateY(0); filter: blur(0); }
  28%, 85% { opacity: 1; transform: scale(1) translateY(0); filter: blur(0); } 
  92%, 100% { opacity: 0; transform: scale(0.9) translateY(-20px); filter: blur(5px); }
}

/* ⚡ Lightning & Sparks Elements ⚡ */
.lightning-strike {
  position: absolute;
  top: 10%;
  left: 50%;
  width: 15px;
  height: 120px;
  background: #fff;
  opacity: 0;
  box-shadow: 0 0 20px #fff, 0 0 40px #fde047, 0 0 80px #facc15;
  filter: blur(1px) drop-shadow(0 0 15px #fef08a);
  clip-path: polygon(30% 0, 100% 0, 60% 40%, 100% 40%, 10% 100%, 40% 60%, 0% 60%);
  z-index: 5;
  animation: lightningBolt 9s infinite linear;
  transform-origin: top center;
}

.spark {
  position: absolute;
  width: 3px;
  height: 40px;
  background: #fff;
  border-radius: 4px;
  box-shadow: 0 0 10px #fff, 0 0 20px #fde047, 0 0 40px #eab308;
  opacity: 0;
  z-index: 4;
}

.spark-1 { top: 50%; left: 50%; animation: spark1 9s infinite cubic-bezier(0.1, 1, 0.3, 1); }
.spark-2 { top: 50%; left: 50%; animation: spark2 9s infinite cubic-bezier(0.1, 1, 0.3, 1); }
.spark-3 { top: 50%; left: 50%; animation: spark3 9s infinite cubic-bezier(0.1, 1, 0.3, 1); }
.spark-4 { top: 50%; left: 50%; animation: spark4 9s infinite cubic-bezier(0.1, 1, 0.3, 1); }

/* Sparks shoot outwards at exactly 22% (collision point) */
@keyframes spark1 {
  0%, 21% { opacity: 0; transform: translate(-50%, -50%) rotate(45deg) scaleY(0); }
  22% { opacity: 1; transform: translate(60px, -60px) rotate(45deg) scaleY(2); }
  25%, 100% { opacity: 0; transform: translate(120px, -120px) rotate(45deg) scaleY(0); }
}
@keyframes spark2 {
  0%, 21% { opacity: 0; transform: translate(-50%, -50%) rotate(-45deg) scaleY(0); }
  22% { opacity: 1; transform: translate(-60px, -60px) rotate(-45deg) scaleY(2); }
  25%, 100% { opacity: 0; transform: translate(-120px, -120px) rotate(-45deg) scaleY(0); }
}
@keyframes spark3 {
  0%, 21% { opacity: 0; transform: translate(-50%, -50%) rotate(135deg) scaleY(0); }
  22% { opacity: 1; transform: translate(60px, 60px) rotate(135deg) scaleY(1.5); }
  25%, 100% { opacity: 0; transform: translate(100px, 100px) rotate(135deg) scaleY(0); }
}
@keyframes spark4 {
  0%, 21% { opacity: 0; transform: translate(-50%, -50%) rotate(-135deg) scaleY(0); }
  22% { opacity: 1; transform: translate(-60px, 60px) rotate(-135deg) scaleY(1.5); }
  25%, 100% { opacity: 0; transform: translate(-100px, 100px) rotate(-135deg) scaleY(0); }
}

@keyframes lightningBolt {
  0%, 21.8% { opacity: 0; transform: translateX(-50%) scaleY(0); }
  22% { opacity: 1; transform: translateX(-50%) scaleY(1.2); filter: blur(0px) brightness(1.5); }
  23% { opacity: 0.2; transform: translateX(-50%) scaleY(1); }
  23.5% { opacity: 0.8; transform: translateX(-50%) scaleY(1.1) scaleX(-1); }
  24.5% { opacity: 0; transform: translateX(-50%) scaleY(1); }
  100% { opacity: 0; }
}