:root {
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --bg: #f8fafc;
    --card: #ffffff;
    --text: #0f172a;
    --muted: #64748b;
    --border: #e2e8f0;
    --radius: 14px;
}

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

body {
    background-color: var(--bg);
    font-family: 'Plus Jakarta Sans', sans-serif;
    color: var(--text);
    padding: 60px 20px;
    line-height: 1.5;
}

.container { max-width: 850px; margin: 0 auto; }

.header { text-align: center; margin-bottom: 50px; }
.header h1 { font-size: 2.2rem; font-weight: 800; letter-spacing: -1px; }
.header h1 span { color: var(--primary); }
.header p { color: var(--muted); margin-top: 5px; }

.modern-form {
    background: var(--card);
    padding: 50px; /* Spazio interno generoso per evitare l'effetto ammassato */
    border-radius: var(--radius);
    box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.05);
    border: 1px solid var(--border);
}

.form-group { margin-bottom: 50px; } /* Distanza tra i blocchi Dati Cliente, Coupon, Accesso */

.title {
    font-size: 0.85rem;
    text-transform: uppercase;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 25px;
    display: flex;
    align-items: center;
    gap: 15px;
}

.title::after {
    content: "";
    height: 1px;
    background: var(--border);
    flex-grow: 1;
}

.grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 25px; /* Spaziatura tra i campi che risolve l'effetto "attaccato" */
}

.input-wrapper { display: flex; flex-direction: column; gap: 8px; }
.full { grid-column: span 2; }

label { font-size: 0.85rem; font-weight: 600; color: var(--muted); }

input, select {
    padding: 14px 18px;
    border: 1.5px solid var(--border);
    border-radius: 10px;
    font-size: 1rem;
    outline: none;
    transition: 0.2s;
}

input:focus, select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.1);
}

.checkbox-row {
    grid-column: span 2;
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 15px;
    background: #f1f5f9;
    border-radius: 10px;
}

.btn-submit {
    width: 100%;
    background: var(--primary);
    color: white;
    padding: 18px;
    border: none;
    border-radius: 10px;
    font-size: 1.1rem;
    font-weight: 700;
    cursor: pointer;
    transition: 0.3s;
    margin-top: 10px;
}

.btn-submit:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 10px 15px -3px rgba(37, 99, 235, 0.2);
}

.alert { padding: 15px; border-radius: 10px; margin-bottom: 30px; text-align: center; font-weight: 600; }
.alert.success { background: #dcfce7; color: #166534; border: 1px solid #bbf7d0; }
.alert.error { background: #fee2e2; color: #991b1b; border: 1px solid #fecaca; }

@media (max-width: 600px) { .grid { grid-template-columns: 1fr; } }