:root {
  --card-bg: #ffffff;
  --text-main: #1e293b;
  --text-muted: #64748b;
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --border: #e2e8f0;
  --error: #ef4444;
}

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

body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  color: var(--text-main);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: #f8fafc;
  background-image: 
    radial-gradient(at 0% 0%, rgba(219, 234, 254, 0.5) 0px, transparent 50%),
    radial-gradient(at 100% 100%, rgba(241, 245, 249, 0.8) 0px, transparent 50%),
    radial-gradient(at 50% 50%, rgba(238, 242, 255, 0.4) 0px, transparent 50%);
  padding: 1.5rem;
}

.login-wrapper {
  width: 100%;
  max-width: 400px;
}

.login-card {
  background: var(--card-bg);
  padding: 2.5rem 2rem;
  border-radius: 16px;
  border: 1px solid rgba(226, 232, 240, 0.8);
  box-shadow: 
    0 4px 6px -1px rgba(0, 0, 0, 0.05),
    0 10px 15px -3px rgba(0, 0, 0, 0.05),
    0 20px 25px -5px rgba(0, 0, 0, 0.02);
}

.login-header {
  text-align: center;
  margin-bottom: 2rem;
}

.lock-icon {
  font-size: 1.75rem;
  margin-bottom: 0.5rem;
}

.login-header h1 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 0.25rem;
}

.login-header p {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.form-group {
  margin-bottom: 1.25rem;
}

label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--text-main);
}

input {
  width: 100%;
  padding: 0.75rem 1rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background-color: #fcfdfe;
  font-size: 0.95rem;
  color: var(--text-main);
  transition: all 0.2s;
}

input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
  background-color: #ffffff;
}

.error-message {
  display: none;
  color: var(--error);
  font-size: 0.85rem;
  font-weight: 500;
  margin-bottom: 1rem;
  text-align: center;
}

.btn-submit {
  width: 100%;
  padding: 0.75rem;
  background-color: var(--primary);
  color: #ffffff;
  border: none;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.2s;
  margin-top: 0.5rem;
}

.btn-submit:hover {
  background-color: var(--primary-hover);
}