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

body {
  font-family: "Noto Sans JP", -apple-system, BlinkMacSystemFont, "Segoe UI",
    Roboto, sans-serif;
  background: #f8f9fa;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  position: relative;
}

/* Login Section */
.login-wrapper {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100vh;
  padding: 2rem;
  position: relative;
  z-index: 5;
}

.login-card {
  background: white;
  border-radius: 18px;
  padding: 3rem 2.5rem;
  width: 100%;
  margin-top: 80px;
  max-width: 420px;
  box-shadow: 0 4px 20px rgba(63, 97, 190, 0.08);
  position: relative;
}

.login-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
}

.title {
  font-size: 2rem;
  font-weight: 700;
  color: #2d3748;
  margin-bottom: 0.5rem;
  margin-top: 0.5rem;
  text-align: center;
  letter-spacing: -0.5px;
}

.subtitle {
  color: #718096;
  text-align: center;
  margin-bottom: 2rem;
  font-size: 0.95rem;
}

form {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.input-group {
  position: relative;
}

input {
  width: 100%;
  padding: 1rem 1.2rem;
  border: 1px solid #e2e8f0;
  border-radius: 6px;
  font-size: 1rem;
  transition: border-color 0.2s ease;
  background: white;
  color: #2d3748;
}

input:focus {
  outline: none;
  border-color: #1d4ed8;
}

input::placeholder {
  color: #a0aec0;
}

/* ERROR STYLES */
.input-error {
  border-color: #e53e3e !important;
  box-shadow: 0 0 0 1.5px rgba(229, 62, 62, 0.5);
}

.error-message {
  display: none;
  font-size: 0.85rem;
  color: #e53e3e;
  margin-top: 4px;
}

.error-message.show {
  display: block;
}

.checkbox-group {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: -1rem;
}

.checkbox-group input[type="checkbox"] {
  width: auto;
  margin: 0;
  padding: 0;
}

.checkbox-group label {
  color: #4a5568;
  font-size: 0.9rem;
  cursor: pointer;
}

.options {
  display: flex;
  justify-content: flex-end;
  margin-top: -0.5rem;
}

.options a {
  color: #0066cc;
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  transition: color 0.2s ease;
}

.options a:hover {
  color: #1d4ed8;
  text-decoration: underline;
}

.btn-primary {
  background: #0066cc;
  color: white;
  border: none;
  padding: 1rem;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  margin-top: 1rem;
}

.btn-primary:hover {
  background: #1d4ed8;
  box-shadow: 0 4px 12px rgba(49, 130, 206, 0.2);
}

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

/* Responsive */
@media (max-width: 768px) {
  .hamburger {
    display: flex;
  }

  .nav-links {
    position: fixed;
    top: 80px;
    left: -100%;
    width: 100%;
    height: calc(100vh - 80px);
    background: white;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    flex-direction: column;
    justify-content: flex-start;
    align-items: center;
    padding-top: 2rem;
    transition: left 0.3s ease;
  }

  .nav-links.active {
    left: 0;
  }

  .nav-links a {
    padding: 1rem;
    font-size: 1.1rem;
  }

  .login-card {
    padding: 2rem 1.5rem;
    margin: 1rem;
  }

  .title {
    font-size: 1.75rem;
  }
}