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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    line-height: 1.6;
}

.top {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
}

.top .logo {
    color: white;
    font-size: 1.5rem;
    font-weight: bold;
}

.top .nav {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.top a {
    color: white;
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 25px;
    transition: all 0.3s ease;
    background: rgba(255, 255, 255, 0.1);
}

.top a:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

.content {
    padding: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.login-box {
    max-width: 400px;
    margin: 5rem auto;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    padding: 2.5rem;
    border-radius: 20px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    text-align: center;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.login-box h2 {
    color: #333;
    margin-bottom: 2rem;
    font-size: 2rem;
}

.form-group {
    position: relative;
    margin-bottom: 1.5rem;
}

input {
    width: 100%;
    padding: 1rem;
    border: 2px solid #e1e5e9;
    border-radius: 10px;
    font-size: 1rem;
    transition: all 0.3s ease;
    background: rgba(255, 255, 255, 0.9);
}

input:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

input.error {
    border-color: #e74c3c;
    animation: shake 0.5s ease-in-out;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    75% { transform: translateX(5px); }
}

button {
    width: 100%;
    padding: 1rem;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 10px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-top: 1rem;
}

button:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(102, 126, 234, 0.3);
}

button:active {
    transform: translateY(0);
}

.welcome-card {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    padding: 2rem;
    border-radius: 20px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    text-align: center;
    margin-bottom: 2rem;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.welcome-card h1 {
    color: #333;
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.actions {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.btn {
    padding: 1.5rem 2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    background: rgba(255, 255, 255, 0.95);
    color: #333;
    border-radius: 15px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1.1rem;
    transition: all 0.3s ease;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    border: 2px solid transparent;
}

.btn:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

.btn.entrada {
    border-color: #27ae60;
    background: linear-gradient(135deg, #27ae60, #2ecc71);
    color: white;
}

.btn.salida {
    border-color: #e74c3c;
    background: linear-gradient(135deg, #e74c3c, #c0392b);
    color: white;
}

.btn.historial {
    border-color: #3498db;
    background: linear-gradient(135deg, #3498db, #2980b9);
    color: white;
}

.table-container {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 2rem;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 1rem;
}

table th {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 1rem;
    text-align: left;
    font-weight: 600;
    border: none;
}

table td {
    padding: 1rem;
    border-bottom: 1px solid #e1e5e9;
    background: rgba(255, 255, 255, 0.5);
}

table tr:hover td {
    background: rgba(102, 126, 234, 0.1);
}

.error {
    color: #e74c3c;
    background: rgba(231, 76, 60, 0.1);
    padding: 1rem;
    border-radius: 10px;
    margin-top: 1rem;
    border-left: 4px solid #e74c3c;
}

.success {
    color: #27ae60;
    background: rgba(39, 174, 96, 0.1);
    padding: 1rem;
    border-radius: 10px;
    margin-top: 1rem;
    border-left: 4px solid #27ae60;
}

.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Responsive Design */
@media (max-width: 768px) {
    .content {
        padding: 1rem;
    }
    
    .login-box {
        margin: 2rem auto;
        padding: 1.5rem;
    }
    
    .top {
        padding: 1rem;
        flex-direction: column;
        gap: 1rem;
    }
    
    .actions {
        grid-template-columns: 1fr;
    }
    
    .welcome-card h1 {
        font-size: 2rem;
    }
    
    .btn {
        padding: 1rem;
        font-size: 1rem;
    }
    
    table {
        font-size: 0.9rem;
    }
    
    table th, table td {
        padding: 0.5rem;
    }
}

@media (max-width: 480px) {
    .login-box {
        margin: 1rem;
        padding: 1rem;
    }
    
    .welcome-card {
        padding: 1rem;
    }
    
    .table-container {
        padding: 1rem;
    }
}