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

body {
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;

    font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;

    background: linear-gradient(
        135deg,
        #0f172a,
        #1e293b,
        #0f766e
    );
}

.container {
    width: 100%;
    max-width: 500px;

    background: rgba(255,255,255,0.08);
    backdrop-filter: blur(20px);

    border: 1px solid rgba(255,255,255,0.1);

    border-radius: 24px;

    padding: 40px 30px;

    box-shadow:
        0 20px 50px rgba(0,0,0,0.4),
        inset 0 1px 0 rgba(255,255,255,0.1);
}

h1 {
    color: white;
    text-align: center;
    margin-bottom: 10px;
    font-size: 2rem;
}

.subtitle {
    text-align: center;
    color: #cbd5e1;
    margin-bottom: 30px;
}

label {
    display: block;
    color: white;
    font-weight: 600;
    margin-bottom: 10px;
    margin-top: 15px;
}

input,
textarea {
    width: 100%;

    padding: 16px;

    border-radius: 14px;

    border: 2px solid rgba(255,255,255,0.1);

    background: rgba(255,255,255,0.08);

    color: white;
    font-size: 16px;

    outline: none;
    transition: all .3s ease;
}

textarea {
    resize: vertical;
    min-height: 120px;
}

input::placeholder,
textarea::placeholder {
    color: rgba(148, 163, 184, 0.65);
    font-weight: 400;
}

input:focus,
textarea:focus {
    border-color: #25D366;
    box-shadow: 0 0 20px rgba(37,211,102,.35);
}

button {
    width: 100%;
    margin-top: 20px;
    padding: 16px;

    border: none;
    border-radius: 14px;

    background: linear-gradient(
        135deg,
        #25D366,
        #128C7E
    );

    color: white;

    font-size: 17px;
    font-weight: 700;

    cursor: pointer;
}

button:hover {
    transform: translateY(-2px);
}

.error {
    color: #ff6b6b;
    font-size: 14px;
    margin-top: 8px;
    display: block;
}

.hidden {
    display: none;
}

.result {
    margin-top: 25px;
    text-align: center;
}

.result h2 {
    color: white;
    margin-bottom: 15px;
}

.whatsapp-button {
    display: inline-block;

    padding: 14px 28px;

    border-radius: 14px;

    text-decoration: none;

    color: white;

    font-weight: 600;

    background: linear-gradient(
        135deg,
        #25D366,
        #128C7E
    );
}

.whatsapp-button:hover {
    transform: translateY(-2px);
}

@media (max-width: 600px) {

    .container {
        padding: 25px 20px;
    }

    h1 {
        font-size: 1.7rem;
    }
}