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

body {
    font-family: 'Arial', sans-serif;
    line-height: 1.6;
    background-color: #1a1a1a;
    color: #e0e0e0;
    padding: 2rem;
    max-width: 600px;
    margin: 0 auto;
}

h2 {
    color: #ffffff;
    text-align: center;
    margin-bottom: 1.5rem;
    font-size: 2rem;
}

form {
    background: #2d2d2d;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.3);
}

label {
    display: block;
    margin-bottom: 0.5rem;
    color: #b0b0b0;
    font-size: 0.9rem;
}

.input-group {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
}

.input-group input {
    flex: 1;
    margin-bottom: 0;
}

#custom-url {
    max-width: 150px;
}

input {
    padding: 0.8rem;
    border: 1px solid #555555;
    border-radius: 4px;
    font-size: 1rem;
    background: #404040;
    color: #e0e0e0;
}

input::placeholder {
    color: #999999;
}

input[type="submit"],
input[type="button"] {
    color: white;
    border: none;
    padding: 1rem;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    width: auto;
    position: relative;
}

#url-send {
    width: 100%;
    margin-bottom: 1.5rem;
    transform: translateY(0);
    box-shadow: 0 2px 4px rgba(0,0,0,0.2);
    background: crimson;
}

#url-send:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.3);
    background: #dc143c; /* nieco jaśniejszy crimson */
}

#url-send:active {
    transform: translateY(1px);
    box-shadow: 0 1px 2px rgba(0,0,0,0.2);
    background: #b01030; /* ciemniejszy odcień crimson */
}

#url-send:focus {
    outline: 2px solid #ff6b81; /* różowy odcień dla focusa */
}

#copy {
    flex-shrink: 0;
    width: 120px;
    transition: transform 0.2s ease;
    background: #555555;
}

#copy:hover {
    transform: scale(1.05);
    background: #666666;
}

#copy:active {
    transform: scale(0.95);
}

.output-group {
    display: flex;
    gap: 0.5rem;
    margin-top: 1rem;
}

#url-output {
    flex: 1;
    background: #333333;
    cursor: not-allowed;
    border-color: #555555;
}

@media (max-width: 480px) {
    body {
        padding: 1rem;
    }
    
    form {
        padding: 1.5rem;
    }
    
    .input-group {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    #custom-url {
        max-width: none;
    }
}