* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: sans-serif; line-height: 1.6; color: #333; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

.header { background: linear-gradient(135deg, #667eea, #764ba2); color: white; padding: 1rem 0; }
.nav { display: flex; justify-content: space-between; align-items: center; }
.logo { color: white; text-decoration: none; font-size: 1.5rem; font-weight: bold; }
.nav-links a { color: white; text-decoration: none; margin-left: 1.5rem; }
.btn-login { background: rgba(255,255,255,0.2); padding: 0.5rem 1rem; border-radius: 5px; }

.hero { padding: 6rem 0; text-align: center; background: #f8f9fa; }
.hero h1 { font-size: 3rem; margin-bottom: 1rem; }
.btn { display: inline-block; padding: 0.75rem 2rem; background: #667eea; color: white; text-decoration: none; border-radius: 5px; margin-top: 1rem; }

.features { padding: 4rem 0; }
.feature-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 2rem; margin-top: 2rem; }
.feature { padding: 2rem; background: white; border-radius: 10px; box-shadow: 0 2px 10px rgba(0,0,0,0.05); text-align: center; }
.icon { font-size: 3rem; margin-bottom: 1rem; }

.auth-section { padding: 4rem 0; min-height: 80vh; display: flex; align-items: center; justify-content: center; background: #f8f9fa; }
.auth-card { background: white; padding: 2.5rem; border-radius: 10px; box-shadow: 0 4px 20px rgba(0,0,0,0.1); width: 100%; max-width: 400px; }
.auth-card h2 { margin-bottom: 0.5rem; }
.form-group { margin-bottom: 1.25rem; }
.form-group label { display: block; margin-bottom: 0.5rem; font-weight: 500; }
.form-group input { width: 100%; padding: 0.75rem; border: 1px solid #ddd; border-radius: 5px; }
.btn-full { width: 100%; border: none; cursor: pointer; font-size: 1rem; }

.alert { padding: 1rem; margin: 1rem 0; border-radius: 5px; }
.alert-error { background: #fed7d7; color: #c53030; }

.dashboard { padding: 3rem 0; }
.stats { display: flex; gap: 2rem; margin-top: 2rem; }
.stat-card { background: white; padding: 1.5rem; border-radius: 10px; box-shadow: 0 2px 10px rgba(0,0,0,0.05); flex: 1; text-align: center; }
.num { font-size: 2rem; font-weight: bold; color: #667eea; margin-top: 0.5rem; }

.page-content { padding: 4rem 0; min-height: 60vh; }

.footer { background: #2d3748; color: white; padding: 2rem 0; text-align: center; margin-top: 3rem; }