:root, [data-bs-theme="light"] {
  --bg-gradient-1: #a1c4fd;
  --bg-gradient-2: #c2e9fb;
  --card-bg: rgba(255, 255, 255, 0.95);
  --card-border: rgba(255, 255, 255, 0.4);
  --card-shadow: rgba(0, 0, 0, 0.25);
  --text-dark: #2d3436;
  --text-muted: #6c757d;
  --form-bg: #f4f7f6;
  --form-border: transparent;
  --form-focus-bg: #ffffff;
  --form-focus-border: #4facfe;
  --form-focus-shadow: rgba(79, 172, 254, 0.15);
  --form-label-color: #4a5568;
  --blob-1: #ff9ff3;
  --blob-2: #00d2d3;
  --logo-shadow: rgba(79, 172, 254, 0.4);
  --success-overlay-bg: rgba(255, 255, 255, 0.98);
}

[data-bs-theme="dark"] {
  --bg-gradient-1: #0f172a;
  --bg-gradient-2: #1e293b;
  --card-bg: rgba(30, 41, 59, 0.85);
  --card-border: rgba(255, 255, 255, 0.1);
  --card-shadow: rgba(0, 0, 0, 0.55);
  --text-dark: #f8fafc;
  --text-muted: #94a3b8;
  --form-bg: #0f172a;
  --form-border: rgba(255, 255, 255, 0.15);
  --form-focus-bg: #1e293b;
  --form-focus-border: #38bdf8;
  --form-focus-shadow: rgba(56, 189, 248, 0.25);
  --form-label-color: #cbd5e1;
  --blob-1: #3b82f6;
  --blob-2: #8b5cf6;
  --logo-shadow: rgba(59, 130, 246, 0.4);
  --success-overlay-bg: rgba(15, 23, 42, 0.98);
}

body {
  font-family: 'Outfit', sans-serif;
  background: linear-gradient(135deg, var(--bg-gradient-1) 0%, var(--bg-gradient-2) 100%);
  background-size: 400% 400%;
  animation: gradientBG 15s ease infinite;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  margin: 0;
}

@keyframes gradientBG {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

.login-wrapper {
  width: 100%;
  max-width: 420px;
  padding: 20px;
  perspective: 1000px;
}

.login-card {
  background: var(--card-bg);
  backdrop-filter: blur(20px);
  border-radius: 24px;
  padding: 3.5rem 2.5rem;
  box-shadow: 0 25px 50px var(--card-shadow);
  border: 1px solid var(--card-border);
  position: relative;
  overflow: hidden;
  transform-style: preserve-3d;
  animation: floatUp 0.8s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards;
}

@keyframes floatUp {
  0% { opacity: 0; transform: translateY(40px) rotateX(-10deg); }
  100% { opacity: 1; transform: translateY(0) rotateX(0); }
}

.brand-logo {
  width: 75px;
  height: 75px;
  background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
  color: white;
  border-radius: 22px; /* modern squircle */
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 36px;
  font-weight: 700;
  margin: 0 auto 1.5rem auto;
  box-shadow: 0 10px 20px var(--logo-shadow);
  transform: rotate(-5deg);
  transition: transform 0.3s ease;
}

.login-card:hover .brand-logo {
  transform: rotate(0deg) scale(1.05);
}

.form-control {
  background-color: var(--form-bg);
  border: 2px solid var(--form-border);
  padding: 0.9rem 1.2rem;
  border-radius: 14px;
  font-size: 1.05rem;
  font-weight: 400;
  color: var(--text-dark);
  transition: all 0.3s ease;
}

.form-control::placeholder {
  color: var(--text-muted);
  opacity: 0.7;
}

.form-control:focus {
  background-color: var(--form-focus-bg);
  border-color: var(--form-focus-border);
  box-shadow: 0 0 0 4px var(--form-focus-shadow);
  color: var(--text-dark);
}

.form-label {
  font-weight: 600;
  color: var(--form-label-color);
  margin-bottom: 0.5rem;
  margin-left: 0.2rem;
}

.btn-primary {
  background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
  border: none;
  padding: 1rem;
  border-radius: 14px;
  font-size: 1.1rem;
  font-weight: 600;
  letter-spacing: 0.5px;
  box-shadow: 0 10px 20px var(--logo-shadow);
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 15px 25px var(--logo-shadow);
}

.btn-primary:active {
  transform: translateY(1px);
}

.form-alert {
  border-radius: 12px;
  border: none;
  padding: 1rem;
  font-weight: 500;
}

/* Success Animation Overlay */
.success-overlay {
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background: var(--success-overlay-bg);
  z-index: 100;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.4s ease;
}

.success-overlay.active {
  opacity: 1;
  visibility: visible;
}

.success-icon {
  width: 90px;
  height: 90px;
  border-radius: 50%;
  background: linear-gradient(135deg, #4cd137 0%, #00a8ff 100%);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 45px;
  margin-bottom: 1.5rem;
  box-shadow: 0 15px 30px rgba(76, 209, 55, 0.3);
  transform: scale(0);
}

.success-overlay.active .success-icon {
  animation: bounceIn 0.8s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards;
  animation-delay: 0.1s;
}

@keyframes bounceIn {
  0% { transform: scale(0); }
  50% { transform: scale(1.15); }
  100% { transform: scale(1); }
}

.loading-text {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-dark);
  margin-top: 10px;
  opacity: 0;
  transform: translateY(10px);
}

.success-overlay.active .loading-text {
  animation: fadeUp 0.5s ease forwards;
  animation-delay: 0.4s;
}

@keyframes fadeUp {
  to { opacity: 1; transform: translateY(0); }
}

.loading-dots:after {
  content: '.';
  animation: dots 1.5s steps(5, end) infinite;
}

@keyframes dots {
  0%, 20% { color: rgba(0,0,0,0); text-shadow: .25em 0 0 rgba(0,0,0,0), .5em 0 0 rgba(0,0,0,0); }
  40% { color: var(--text-dark); text-shadow: .25em 0 0 rgba(0,0,0,0), .5em 0 0 rgba(0,0,0,0); }
  60% { text-shadow: .25em 0 0 var(--text-dark), .5em 0 0 rgba(0,0,0,0); }
  80%, 100% { text-shadow: .25em 0 0 var(--text-dark), .5em 0 0 var(--text-dark); }
}

.decor-blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(40px);
  z-index: -1;
  opacity: 0.6;
}
.blob-1 {
  top: -50px; left: -50px;
  width: 150px; height: 150px;
  background: var(--blob-1);
}
.blob-2 {
  bottom: -50px; right: -50px;
  width: 200px; height: 200px;
  background: var(--blob-2);
}

/* Theme Toggle Button Styling */
.theme-toggle-btn {
  position: absolute;
  top: 1.5rem;
  right: 1.5rem;
  color: var(--text-muted);
  font-size: 1.25rem;
  padding: 0.5rem;
  border-radius: 50%;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s ease;
  border: none;
  background: transparent;
  text-decoration: none;
  z-index: 10;
}

.theme-toggle-btn:hover {
  color: var(--text-dark);
  background-color: var(--form-bg);
  transform: rotate(15deg);
}

.theme-toggle-btn:focus {
  outline: none;
  box-shadow: none;
}

/* Bootstrap Overrides for Darkmode */
[data-bs-theme="dark"] .text-dark {
  color: var(--text-dark) !important;
}

[data-bs-theme="dark"] .text-muted {
  color: var(--text-muted) !important;
}

[data-bs-theme="dark"] .btn-light {
  background-color: #334155;
  border-color: rgba(255, 255, 255, 0.15) !important;
  color: #fca5a5 !important;
}

[data-bs-theme="dark"] .btn-light:hover {
  background-color: #475569;
}