:root {
  --primary: #007bff;
  --bg-light: #ffffff;
  --text-light: #000000;
  --input-bg-light: rgba(255, 255, 255, 0.7);
  --input-border-light: #d0d0d0;

  --bg-dark: #1e1e2f;
  --text-dark: #ffffff;
  --input-bg-dark: rgba(255, 255, 255, 0.1);
  --input-border-dark: #3a3a4a;
}

body {
  font-family: 'Poppins', sans-serif;
  margin: 0;
  padding: 0;
  height: 100vh;
  background-color: var(--bg-light);
  color: var(--text-light);
  display: flex;
  justify-content: center;
  align-items: center;
  transition: all 0.3s ease;
}

body.dark-mode {
  background-color: var(--bg-dark);
  color: var(--text-dark);
}

.auth-container {
  background-color: rgba(255, 255, 255, 0.85);
  padding: 2rem;
  border-radius: 16px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
  width: 100%;
  max-width: 400px;
  backdrop-filter: blur(10px);
  transition: all 0.3s ease;
}

body.dark-mode .auth-container {
  background-color: rgba(30, 30, 47, 0.85);
}

.auth-container h2 {
  margin-bottom: 1.5rem;
  font-weight: 600;
  font-size: 1.5rem;
  color: var(--primary);
  text-align: center;
}

.input-group {
  margin-bottom: 1.2rem;
  display: flex;
  flex-direction: column;
}

.input-group label {
  font-size: 0.9rem;
  margin-bottom: 0.4rem;
}

.input-group input {
  padding: 0.9rem;
  border: 1px solid var(--input-border-light);
  border-radius: 10px;
  background-color: var(--input-bg-light);
  transition: all 0.3s ease;
  font-size: 1rem;
}

body.dark-mode .input-group input {
  border: 1px solid var(--input-border-dark);
  background-color: var(--input-bg-dark);
  color: var(--text-dark);
}

.input-group input:focus {
  outline: none;
  border-color: var(--primary);
}

button[type="submit"] {
  width: 100%;
  background-color: var(--primary);
  color: white;
  padding: 0.9rem;
  border: none;
  border-radius: 10px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
}

button[type="submit"]:hover {
  background-color: #0056b3;
}

.toggle-form {
  margin-top: 1rem;
  text-align: center;
  font-size: 0.9rem;
}

.toggle-form a {
  color: var(--primary);
  cursor: pointer;
  text-decoration: underline;
}

.theme-toggle {
  position: absolute;
  top: 20px;
  right: 20px;
  background: var(--primary);
  color: white;
  border: none;
  padding: 0.6rem 1rem;
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.3s ease;
}

.theme-toggle:hover {
  background: #0056b3;
}

/* Dark Mode Overrides */
body.dark-mode {
background-color: #121212;
color: #f5f5f5;
}

body.dark-mode .auth-container {
background-color: #1e1e1e;
border-radius: 12px;
box-shadow: 0 4px 20px rgba(0,0,0,0.5);
}

body.dark-mode input[type="text"],
body.dark-mode input[type="password"] {
background-color: #2a2a2a;
color: #f5f5f5;
border: 1px solid #444;
}

body.dark-mode input[type="text"]::placeholder,
body.dark-mode input[type="password"]::placeholder {
color: #aaa;
}

body.dark-mode label {
color: #ddd;
}

body.dark-mode .btn-primary {
background-color: #6c5ce7;
color: white;
}

body.dark-mode .btn-primary:hover {
background-color: #5a4bd1;
}