/* ── Join page layout ── */
.arb-join-wrap {
    min-height: 70vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem 1rem;
    box-sizing: border-box;
}
.arb-join-card {
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 4px 24px rgba(0,0,0,.10);
    padding: 2.5rem 2rem;
    width: 100%;
    max-width: 420px;
    box-sizing: border-box;
}
.arb-join-card h1 {
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0 0 .25rem;
    color: #111827;
}
.arb-join-card .arb-subtitle {
    font-size: .9rem;
    color: #6b7280;
    margin: 0 0 1.75rem;
}
.arb-join-field {
    margin-bottom: 1.1rem;
}
.arb-join-field label {
    display: block;
    font-size: .85rem;
    font-weight: 600;
    color: #374151;
    margin-bottom: .35rem;
}
.arb-join-field input {
    width: 100%;
    padding: .65rem .85rem;
    border: 1.5px solid #d1d5db;
    border-radius: 8px;
    font-size: 1rem;
    box-sizing: border-box;
    transition: border-color .15s;
    outline: none;
    font-family: inherit;
}
.arb-join-field input:focus {
    border-color: #6366f1;
    box-shadow: 0 0 0 3px rgba(99,102,241,.12);
}
.arb-join-field input.arb-code-input {
    text-transform: uppercase;
    letter-spacing: .15em;
    font-size: 1.15rem;
    font-weight: 600;
    font-family: ui-monospace, monospace;
}
.arb-join-btn {
    width: 100%;
    padding: .75rem;
    background: #6366f1;
    color: #fff;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    margin-top: .5rem;
    transition: background .15s, opacity .15s;
    font-family: inherit;
}
.arb-join-btn:hover { background: #4f46e5; }
.arb-join-btn:disabled { opacity: .6; cursor: not-allowed; }
.arb-join-alert {
    display: none;
    padding: .75rem 1rem;
    border-radius: 8px;
    font-size: .9rem;
    margin-bottom: 1.1rem;
    line-height: 1.45;
}
.arb-join-alert.error {
    background: #fef2f2;
    color: #b91c1c;
    border: 1px solid #fecaca;
}
.arb-join-alert.success {
    background: #f0fdf4;
    color: #166534;
    border: 1px solid #bbf7d0;
}
/* RTL support */
[dir="rtl"] .arb-join-field input { text-align: right; }
[dir="rtl"] .arb-join-field input.arb-code-input { text-align: center; }

@media (max-width: 480px) {
    .arb-join-card { padding: 1.75rem 1.25rem; border-radius: 8px; }
}