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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.container {
  background: white;
  border-radius: 12px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
  padding: 40px;
  max-width: 800px;
  width: 100%;
}

header {
  text-align: center;
  margin-bottom: 30px;
}

h1 {
  color: #333;
  font-size: 2.5em;
  margin-bottom: 10px;
}

.subtitle {
  color: #666;
  font-size: 1.1em;
}

/* Auth Section */
.auth-tabs {
  display: flex;
  gap: 10px;
  margin-bottom: 20px;
  border-bottom: 2px solid #eee;
}

.tab-btn {
  padding: 12px 24px;
  border: none;
  background: none;
  color: #666;
  font-size: 1em;
  cursor: pointer;
  transition: all 0.3s;
  border-bottom: 3px solid transparent;
}

.tab-btn.active {
  color: #667eea;
  border-bottom-color: #667eea;
}

.auth-form {
  display: none;
}

.auth-form.active {
  display: block;
}

.form-group {
  margin-bottom: 20px;
}

label {
  display: block;
  margin-bottom: 8px;
  color: #333;
  font-weight: 500;
}

input[type="text"],
input[type="email"],
input[type="password"] {
  width: 100%;
  padding: 12px;
  border: 2px solid #ddd;
  border-radius: 6px;
  font-size: 1em;
  transition: border-color 0.3s;
}

input:focus {
  outline: none;
  border-color: #667eea;
}

.btn {
  padding: 12px 24px;
  border: none;
  border-radius: 6px;
  font-size: 1em;
  cursor: pointer;
  transition: all 0.3s;
  text-decoration: none;
  display: inline-block;
  text-align: center;
}

.btn-primary {
  background: #667eea;
  color: white;
  width: 100%;
}

.btn-primary:hover {
  background: #5568d3;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
}

.btn-secondary {
  background: #e0e0e0;
  color: #333;
}

.btn-secondary:hover {
  background: #d0d0d0;
}

.error-message {
  color: #e74c3c;
  margin-top: 10px;
  font-size: 0.9em;
}

/* Dashboard */
.hidden {
  display: none;
}

.dashboard-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 30px;
  padding-bottom: 20px;
  border-bottom: 2px solid #eee;
}

.dashboard-header h2 {
  color: #333;
}

/* Dashboard Sections */
.dashboard-section {
  margin-bottom: 40px;
}

.section-title {
  color: #667eea;
  font-size: 1.3em;
  margin-bottom: 15px;
  padding-bottom: 10px;
  border-bottom: 2px solid #eee;
}

.dashboard-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
}

.dashboard-card {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  padding: 30px;
  border-radius: 8px;
  color: white;
  text-align: center;
  transition: transform 0.3s;
}

.dashboard-card:hover {
  transform: translateY(-5px);
}

.dashboard-card h3 {
  margin-bottom: 10px;
  font-size: 1.5em;
}

.dashboard-card p {
  margin-bottom: 20px;
  opacity: 0.9;
}

.dashboard-card .btn {
  background: white;
  color: #667eea;
  width: auto;
  padding: 10px 20px;
}

.dashboard-card .btn:hover {
  background: #f0f0f0;
}