/* Global */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Poppins', sans-serif;
  transition: background 0.3s, color 0.3s;
}

body {
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  background: var(--bg);
  color: var(--text);
}

/* Light & Dark Mode */
:root {
  --bg: linear-gradient(135deg, #ffecd2, #fcb69f);
  --text: #222;
  --form-bg: #fff;
  --input-bg: #f9f9f9;
  --input-text: #333;
  --btn-bg: #007bff;
  --btn-text: #fff;
}
body.dark {
  --bg: linear-gradient(135deg, #0f172a, #1e293b);
  --text: #f1f5f9;
  --form-bg: #1e293b;
  --input-bg: #334155;
  --input-text: #f1f5f9;
  --btn-bg: #38bdf8;
  --btn-text: #0f172a;
}

/* Form Container */
.form-container {
  background: var(--form-bg);
  padding: 30px;
  border-radius: 15px;
  box-shadow: 0 5px 25px rgba(0,0,0,0.15);
  width: 100%;
  max-width: 400px;
  text-align: center;
}

.title {
  font-size: 2rem;
  margin-bottom: 10px;
}

.subtitle {
  font-size: 1.2rem;
  margin-bottom: 25px;
  font-weight: 400;
  opacity: 0.9;
}

/* Input Groups */
.input-group {
  display: flex;
  align-items: center;
  margin-bottom: 15px;
  background: var(--input-bg);
  border-radius: 8px;
  padding: 10px;
}
.input-group i {
  margin-right: 10px;
  color: #666;
}
body.dark .input-group i {
  color: #94a3b8;
}
.input-group input {
  flex: 1;
  border: none;
  outline: none;
  background: transparent;
  color: var(--input-text);
  font-size: 1rem;
}

/* Button */
.btn {
  width: 100%;
  padding: 12px;
  border: none;
  border-radius: 8px;
  background: var(--btn-bg);
  color: var(--btn-text);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  margin-top: 10px;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 5px 15px rgba(0,0,0,0.2);
}

/* Login Link */
.login-link {
  margin-top: 15px;
  font-size: 0.9rem;
}
.login-link a {
  color: var(--btn-bg);
  font-weight: 600;
  text-decoration: none;
}
body.dark .login-link a {
  color: #38bdf8;
}

/* Theme Toggle */
.theme-toggle {
  position: absolute;
  top: 20px;
  right: 20px;
  width: 45px;
  height: 45px;
  border-radius: 50%;
  display: flex;
  justify-content: center;
  align-items: center;
  background: var(--form-bg);
  color: var(--text);
  font-size: 20px;
  cursor: pointer;
  border: 2px solid #ddd;
  transition: all 0.3s ease;
}
.theme-toggle:hover {
  transform: scale(1.1);
}

/* Responsive */
@media (max-width: 600px) {
  .form-container {
    width: 90%;
    padding: 20px;
  }
  .title {
    font-size: 1.6rem;
  }
  .subtitle {
    font-size: 1rem;
  }
}