*, *::before, *::after { box-sizing: border-box; }

html, body { height: 100%; }

body {
    font-family: "Source Sans Pro", sans-serif;
    background: linear-gradient(135deg, #1c2130 0%, #2c3347 45%, #1a2a45 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: 1rem;
}

/* ── Login box ── */
.login-box {
    width: 100%;
    max-width: 380px;
}

/* ── Logo ── */
.login-logo {
    text-align: center;
    margin-bottom: 1.5rem;
}
.login-logo a {
    color: #fff;
    text-decoration: none;
    font-size: 1.75rem;
    font-weight: 700;
    letter-spacing: .04em;
}
.login-logo a .brand-accent { color: #4e9af1; }
.login-logo .brand-sub {
    display: block;
    color: rgba(255,255,255,.45);
    font-size: .8rem;
    font-weight: 300;
    margin-top: .2rem;
    letter-spacing: .06em;
    text-transform: uppercase;
}

/* ── Card ── */
.login-card {
    background: #fff;
    border-radius: 10px;
    box-shadow: 0 12px 45px rgba(0,0,0,.5);
    overflow: hidden;
}
.login-card-top {
    height: 4px;
    background: linear-gradient(90deg, #0d6efd 0%, #4e9af1 100%);
}
.login-card-header {
    padding: 1.4rem 1.75rem .9rem;
    border-bottom: 1px solid #f0f0f0;
    text-align: center;
}
.login-card-header h5 {
    margin: 0;
    font-size: .95rem;
    font-weight: 600;
    color: #343a40;
}
.login-card-header p {
    margin: .25rem 0 0;
    font-size: .8rem;
    color: #6c757d;
}
.login-card-body {
    padding: 1.75rem;
}

/* ── Form fields ── */
.field-label {
    display: block;
    font-size: .72rem;
    font-weight: 600;
    letter-spacing: .07em;
    text-transform: uppercase;
    color: #6c757d;
    margin-bottom: .4rem;
}

.input-group .input-group-text {
    background: #f8f9fa;
    border-right: none;
    color: #adb5bd;
    min-width: 38px;
    justify-content: center;
    transition: color .15s, border-color .15s;
}
.input-group .form-control {
    border-left: none;
}
.input-group:focus-within .input-group-text {
    border-color: #86b7fe;
    color: #0d6efd;
}
.input-group:focus-within .form-control {
    border-color: #86b7fe;
    box-shadow: none;
}
.input-group .btn-toggle-pw {
    background: #f8f9fa;
    border-left: none;
    border-color: #ced4da;
    color: #adb5bd;
    padding: 0 .65rem;
}
.input-group .btn-toggle-pw:hover { color: #0d6efd; }
.input-group:focus-within .btn-toggle-pw { border-color: #86b7fe; }

/* ── Submit ── */
.btn-accedi {
    background: linear-gradient(90deg, #0d6efd, #3d8ef8);
    border: none;
    color: #fff;
    font-weight: 600;
    font-size: .95rem;
    letter-spacing: .04em;
    padding: .55rem 1rem;
    border-radius: 6px;
    transition: opacity .2s, transform .1s;
    width: 100%;
}
.btn-accedi:hover  { opacity: .9; transform: translateY(-1px); color: #fff; }
.btn-accedi:active { transform: translateY(0); }

/* ── Alert errori ── */
.login-alert {
    font-size: .88rem;
    padding: .55rem .85rem;
    border-radius: 6px;
}

/* ── Footer ── */
.login-footer {
    text-align: center;
    margin-top: 1.25rem;
    font-size: .75rem;
    color: rgba(255,255,255,.35);
}