* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', sans-serif;
}

body {
    background: linear-gradient(135deg, #1a1a2e, #16213e, #0f3460);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.container {
    background: white;
    padding: 40px;
    border-radius: 20px;
    width: 100%;
    max-width: 500px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
}

h1 {
    color: #1a1a2e;
    margin-bottom: 10px;
    font-size: 28px;
}

p {
    color: #666;
    margin-bottom: 25px;
}

input {
    width: 100%;
    padding: 15px;
    border: 2px solid #e0e0e0;
    border-radius: 10px;
    font-size: 16px;
    outline: none;
    transition: border 0.3s;
}

input:focus {
    border-color: #0f3460;
}

#strengthBar {
    width: 100%;
    height: 10px;
    background: #e0e0e0;
    border-radius: 10px;
    margin: 20px 0 10px;
    overflow: hidden;
}

#strengthFill {
    height: 100%;
    width: 0%;
    border-radius: 10px;
    transition: all 0.4s ease;
}

#strengthText {
    font-weight: bold;
    font-size: 16px;
    margin-bottom: 20px;
    color: #333;
}

#tips {
    background: #f8f9fa;
    padding: 20px;
    border-radius: 10px;
    margin-top: 10px;
}

#tips h3 {
    color: #1a1a2e;
    margin-bottom: 10px;
}

#tipsList li {
    color: #555;
    margin: 8px 0;
    padding-left: 10px;
    font-size: 14px;
}