<div class="form-container">
<form class="interactive-form">
<div class="form-group">
<input type="text" id="name" required>
<label for="name">Nombre completo</label>
<span class="form-line"></span>
</div>
<div class="form-group">
<input type="email" id="email" required>
<label for="email">Correo electrónico</label>
<span class="form-line"></span>
</div>
<div class="form-group">
<textarea id="message" required></textarea>
<label for="message">Mensaje</label>
<span class="form-line"></span>
</div>
<button type="submit" class="submit-btn">
<span>Enviar mensaje</span>
<div class="btn-loader"></div>
</button>
</form>
</div>
.form-container {
max-width: 500px;
margin: 2rem auto;
padding: 2rem;
background: #fff;
border-radius: 12px;
box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}
.interactive-form {
display: flex;
flex-direction: column;
gap: 2rem;
}
.form-group {
position: relative;
}
.form-group input,
.form-group textarea {
width: 100%;
padding: 1rem 0;
border: none;
border-bottom: 2px solid #e1e5e9;
background: transparent;
font-size: 1rem;
outline: none;
transition: all 0.3s ease;
}
.form-group label {
position: absolute;
top: 1rem;
left: 0;
font-size: 1rem;
color: #999;
pointer-events: none;
transition: all 0.3s ease;
}
.form-group input:focus + label,
.form-group input:valid + label,
.form-group textarea:focus + label,
.form-group textarea:valid + label {
top: -0.5rem;
font-size: 0.8rem;
color: #3b82f6;
}
.form-line {
position: absolute;
bottom: 0;
left: 0;
width: 0;
height: 2px;
background: #3b82f6;
transition: width 0.3s ease;
}
.form-group input:focus ~ .form-line,
.form-group textarea:focus ~ .form-line {
width: 100%;
}
.submit-btn {
position: relative;
padding: 1rem 2rem;
background: #3b82f6;
color: white;
border: none;
border-radius: 8px;
font-size: 1rem;
font-weight: 600;
cursor: pointer;
overflow: hidden;
transition: all 0.3s ease;
}
.submit-btn:hover {
background: #2563eb;
transform: translateY(-2px);
box-shadow: 0 4px 12px rgba(59, 130, 246, 0.4);
}
.btn-loader {
position: absolute;
top: 50%;
left: 50%;
width: 20px;
height: 20px;
border: 2px solid transparent;
border-top: 2px solid white;
border-radius: 50%;
transform: translate(-50%, -50%);
opacity: 0;
animation: spin 1s linear infinite;
}
.submit-btn.loading .btn-loader {
opacity: 1;
}
.submit-btn.loading span {
opacity: 0;
}
@keyframes spin {
0% { transform: translate(-50%, -50%) rotate(0deg); }
100% { transform: translate(-50%, -50%) rotate(360deg); }
}