:root {
  --bg-color: #0f172a;
  --panel-bg: rgba(30, 41, 59, 0.7);
  --panel-border: rgba(255, 255, 255, 0.1);
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --accent-color: #3b82f6;
  --accent-hover: #2563eb;
  --error-color: #ef4444;
  --error-bg: rgba(239, 68, 68, 0.1);
  --input-bg: rgba(15, 23, 42, 0.6);
  --input-border: rgba(255, 255, 255, 0.2);
  --input-focus: rgba(59, 130, 246, 0.5);
  
  --font-main: 'Inter', system-ui, -apple-system, sans-serif;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-main);
  background-color: var(--bg-color);
  background-image: 
    radial-gradient(at 0% 0%, rgba(59, 130, 246, 0.15) 0px, transparent 50%),
    radial-gradient(at 100% 100%, rgba(139, 92, 246, 0.15) 0px, transparent 50%);
  background-attachment: fixed;
  color: var(--text-primary);
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  margin: 0;
}

.login-container {
  width: 100%;
  max-width: 420px;
  padding: 2rem;
  z-index: 10;
}

/* Glassmorphism Card */
.login-card {
  background: var(--panel-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--panel-border);
  border-radius: 1.5rem;
  padding: 2.5rem 2rem;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1), box-shadow 0.3s ease;
}

.login-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 35px 60px -15px rgba(0, 0, 0, 0.6);
}

.logo-section {
  text-align: center;
  margin-bottom: 2rem;
}

.logo-section h1 {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.025em;
  margin-bottom: 0.5rem;
  background: linear-gradient(to right, #60a5fa, #a78bfa);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.logo-section p {
  color: var(--text-secondary);
  font-size: 0.875rem;
}

.error-message {
  background-color: var(--error-bg);
  color: var(--error-color);
  padding: 0.75rem 1rem;
  border-radius: 0.5rem;
  font-size: 0.875rem;
  margin-bottom: 1.5rem;
  border: 1px solid rgba(239, 68, 68, 0.2);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  animation: shake 0.5s cubic-bezier(.36,.07,.19,.97) both;
}

@keyframes shake {
  10%, 90% { transform: translate3d(-1px, 0, 0); }
  20%, 80% { transform: translate3d(2px, 0, 0); }
  30%, 50%, 70% { transform: translate3d(-4px, 0, 0); }
  40%, 60% { transform: translate3d(4px, 0, 0); }
}

.input-group {
  margin-bottom: 1.25rem;
  position: relative;
}

.input-group label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
}

.input-field {
  width: 100%;
  padding: 0.75rem 1rem;
  background-color: var(--input-bg);
  border: 1px solid var(--input-border);
  border-radius: 0.5rem;
  color: var(--text-primary);
  font-family: inherit;
  font-size: 1rem;
  transition: all 0.2s ease;
}

.input-field:focus {
  outline: none;
  border-color: var(--accent-color);
  box-shadow: 0 0 0 3px var(--input-focus);
}

.login-btn {
  width: 100%;
  padding: 0.875rem;
  background-color: var(--accent-color);
  color: white;
  border: none;
  border-radius: 0.5rem;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.2s ease, transform 0.1s ease;
  margin-top: 1rem;
}

.login-btn:hover {
  background-color: var(--accent-hover);
}

.login-btn:active {
  transform: scale(0.98);
}

.login-footer {
  margin-top: 2rem;
  text-align: center;
}

.lang-selector {
  display: flex;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 1rem;
}

.lang-selector a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.875rem;
  transition: color 0.2s ease;
  padding: 0.25rem 0.5rem;
  border-radius: 0.25rem;
}

.lang-selector a:hover, 
.lang-selector a.active {
  color: var(--text-primary);
  background-color: rgba(255, 255, 255, 0.1);
}

.login-footer p {
  color: var(--text-secondary);
  font-size: 0.75rem;
}

/* Background Animated Shapes */
.bg-shape {
  position: absolute;
  filter: blur(80px);
  z-index: 1;
  border-radius: 50%;
  opacity: 0.5;
  animation: float 20s infinite alternate;
}

.shape-1 {
  width: 300px;
  height: 300px;
  background: rgba(59, 130, 246, 0.4);
  top: -100px;
  left: -100px;
}

.shape-2 {
  width: 400px;
  height: 400px;
  background: rgba(139, 92, 246, 0.3);
  bottom: -150px;
  right: -100px;
  animation-delay: -5s;
}

@keyframes float {
  0% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(50px, 50px) scale(1.1); }
  100% { transform: translate(-20px, 30px) scale(0.9); }
}