:root {
  --bg: #000000;
  --aqua: #00fbff;
  --aqua-glow: rgba(0, 251, 255, 0.35);
  --glass: rgba(15, 15, 15, 0.75);
  --glass-border: rgba(255, 255, 255, 0.1);
  --danger: #ff3b30;
  --text: #ffffff;
  --text-secondary: #8e8e93;
  --transition: 0.2s ease-out;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  outline: none;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", sans-serif;
}
body {
  background: var(--bg);
  color: var(--text);
  overflow: hidden;
}

/* HARDWARE ACCELERATION: translate3d and will-change force the GPU to render this, stopping lag */
.background {
  position: fixed;
  inset: 0;
  z-index: -2;
  background: radial-gradient(circle at 50% 50%, #001a1c 0%, #000 100%);
  pointer-events: none;
}
.background-sphere {
  position: fixed;
  width: 90vmax;
  height: 90vmax;
  left: 50%;
  top: 50%;
  margin-left: -45vmax;
  margin-top: -45vmax; /* Faster than translate */
  background: radial-gradient(circle, var(--aqua-glow) 0%, transparent 65%);
  filter: blur(80px);
  pointer-events: none;
  will-change: transform, opacity;
  animation: breath 15s infinite alternate ease-in-out;
}

@keyframes breath {
  0% {
    transform: translate3d(-15%, -15%, 0) scale(1);
    opacity: 0.3;
  }
  100% {
    transform: translate3d(15%, 15%, 0) scale(1.15);
    opacity: 0.5;
  }
}

.login-box {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100vh;
  padding: 20px;
}
.auth-card {
  width: 100%;
  max-width: 420px;
  padding: 60px 40px;
  text-align: center;
}

/* Restored Original Title Gradient */
.auth-title {
  font-size: 52px;
  font-weight: 900;
  background: linear-gradient(135deg, #00fbff, #0072ff);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: -3px;
  margin-bottom: 10px;
}
.auth-subtitle {
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 3px;
  font-size: 12px;
  margin-bottom: 50px;
}

.glass-panel {
  background: var(--glass);
  backdrop-filter: blur(40px) saturate(210%);
  -webkit-backdrop-filter: blur(40px) saturate(210%);
  border: 1px solid var(--glass-border);
  border-radius: 28px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
  transition: var(--transition);
}

/* Upgraded Input Layout */
.input-wrapper {
  position: relative;
  margin-bottom: 25px;
}
.input-icon {
  position: absolute;
  left: 15px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-secondary);
  width: 20px;
  transition: var(--transition);
}

/* Restored Red/Green Validation Effects */
.input {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--glass-border);
  border-radius: 14px;
  padding: 14px 14px 14px 45px;
  color: white;
  width: 100%;
  transition: var(--transition);
}
.input:hover {
  border: 1px solid #00c5c9;
  box-shadow: 0 0 1px 2px #00d9dd;
}
.input:focus {
  border: 1px solid var(--danger);
  box-shadow: 0 0 1px 2px rgba(255, 59, 48, 0.6);
}
.input:valid {
  border: 1px solid rgb(0, 151, 0);
  box-shadow: 0 0 1px 2px rgb(0, 175, 0);
}
.input:focus:not(:placeholder-shown):valid {
  border: 1px solid rgb(0, 151, 0);
  box-shadow: 0 0 1px 2px rgb(0, 175, 0);
}
.input:focus:not(:placeholder-shown):invalid {
  border: 1px solid var(--danger);
  box-shadow: 0 0 1px 2px rgba(255, 59, 48, 0.6);
}
.input:focus + .input-icon,
.input-wrapper:focus-within .input-icon {
  color: var(--aqua);
}

.btn {
  padding: 14px 22px;
  border-radius: 14px;
  font-weight: 700;
  font-size: 15px;
  border: none;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
}
.btn-aqua {
  background: var(--aqua);
  color: #000;
  width: 100%;
}
.btn-aqua:hover {
  box-shadow: 0 0 25px var(--aqua-glow);
  transform: translateY(-2px);
}
.btn-aqua:disabled {
  opacity: 0.7;
  transform: none;
  cursor: not-allowed;
}

.spin {
  animation: spin 1s linear infinite;
}
@keyframes spin {
  100% {
    transform: rotate(360deg);
  }
}

#msg {
  margin-top: 25px;
  font-size: 13px;
  font-weight: bold;
  min-height: 20px;
  transition: 0.1s;
}