* {
    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;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.container {
    width: 100%;
    max-width: 480px;
}

.registration-form {
    background: white;
    border-radius: 16px;
    padding: 40px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

h1 {
    color: #333;
    font-size: 28px;
    margin-bottom: 8px;
    text-align: center;
}

.subtitle {
    color: #666;
    text-align: center;
    margin-bottom: 30px;
    font-size: 14px;
}

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

label {
    display: block;
    margin-bottom: 8px;
    color: #333;
    font-weight: 500;
    font-size: 14px;
}

input[type="text"],
input[type="email"],
input[type="password"] {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid #e1e8ed;
    border-radius: 8px;
    font-size: 14px;
    transition: all 0.3s ease;
    outline: none;
}

input[type="text"]:focus,
input[type="email"]:focus,
input[type="password"]:focus {
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

input.error {
    border-color: #e74c3c;
}

input.success {
    border-color: #2ecc71;
}

.error-message {
    display: block;
    color: #e74c3c;
    font-size: 12px;
    margin-top: 5px;
    min-height: 18px;
}

.password-strength {
    width: 100%;
    height: 4px;
    background: #e1e8ed;
    border-radius: 2px;
    margin-top: 8px;
    overflow: hidden;
}

.strength-bar {
    height: 100%;
    width: 0%;
    transition: all 0.3s ease;
    border-radius: 2px;
}

.strength-bar.weak {
    width: 33%;
    background: #e74c3c;
}

.strength-bar.medium {
    width: 66%;
    background: #f39c12;
}

.strength-bar.strong {
    width: 100%;
    background: #2ecc71;
}

.password-hint {
    display: block;
    color: #999;
    font-size: 11px;
    margin-top: 5px;
}

.checkbox-group {
    margin-top: 20px;
}

.checkbox-label {
    display: flex;
    align-items: flex-start;
    cursor: pointer;
    font-weight: normal;
}

.checkbox-label input[type="checkbox"] {
    margin-right: 8px;
    margin-top: 2px;
    cursor: pointer;
    width: 18px;
    height: 18px;
    flex-shrink: 0;
}

.checkbox-label span {
    font-size: 13px;
    color: #666;
    line-height: 1.5;
}

.link {
    color: #667eea;
    text-decoration: none;
}

.link:hover {
    text-decoration: underline;
}

.btn-submit {
    width: 100%;
    padding: 14px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-top: 10px;
}

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

.btn-submit:active {
    transform: translateY(0);
}

.footer-text {
    text-align: center;
    margin-top: 20px;
    color: #666;
    font-size: 14px;
}

.success-message {
    display: none;
    background: #d4edda;
    color: #155724;
    padding: 15px;
    border-radius: 8px;
    margin-top: 20px;
    text-align: center;
    border: 1px solid #c3e6cb;
}

.success-message.show {
    display: block;
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Responsive */
@media (max-width: 480px) {
    .registration-form {
        padding: 30px 20px;
    }

    h1 {
        font-size: 24px;
    }
}