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

body {
    background-color: #1a1a1a;
    color: #e0e0e0;
    padding: 40px 20px;
    line-height: 1.6;
    min-height: 100vh;
}

.container {
    max-width: 600px;
    margin: 0 auto;
}

h1 {
    margin-bottom: 40px;
    color: #ffffff;
    font-size: 32px;
    font-weight: 600;
    text-align: center;
}

.form-container {
    background-color: #252525;
    border-radius: 12px;
    padding: 40px;
    border: 1px solid #3a3a3a;
}

.form {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

label {
    font-size: 14px;
    font-weight: 500;
    color: #b0b0b0;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.indicator {
    font-size: 18px;
    margin-left: 8px;
}

.valid {
    color: #4ade80;
    font-weight: bold;
}

.invalid {
    color: #ef4444;
    font-weight: bold;
}

input {
    padding: 12px 16px;
    background-color: #333333;
    border: 1px solid #4a4a4a;
    border-radius: 6px;
    color: #e0e0e0;
    font-size: 16px;
    transition: border-color 0.2s;
}

input:focus {
    outline: none;
    border-color: #5a9fd4;
}

input::placeholder {
    color: #666666;
}

.error-message {
    font-size: 13px;
    color: #ef4444;
    padding: 4px 0;
}

.submit-btn {
    margin-top: 16px;
    padding: 14px 24px;
    background-color: #5a9fd4;
    border: none;
    border-radius: 6px;
    color: #ffffff;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.submit-btn:hover:not(:disabled) {
    background-color: #4a8ec4;
    transform: translateY(-1px);
}

.submit-btn:active:not(:disabled) {
    transform: translateY(0);
}

.submit-btn:disabled {
    background-color: #3a3a3a;
    color: #666666;
    cursor: not-allowed;
    opacity: 0.6;
}

.success-message {
    margin-top: 24px;
    padding: 16px;
    background-color: #1e4620;
    border: 1px solid #4ade80;
    border-radius: 6px;
    color: #4ade80;
    font-weight: 600;
    text-align: center;
}

@media (max-width: 640px) {
    .form-container {
        padding: 24px;
    }
    
    h1 {
        font-size: 28px;
    }
}