body {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    background:
        radial-gradient(circle at 10% 0%, rgba(45, 152, 212, 0.12) 0%, transparent 45%),
        radial-gradient(circle at 90% 100%, rgba(39, 45, 63, 0.05) 0%, transparent 45%),
        var(--brand-bg);
}

.page {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.topbar {
    height: 64px;
    display: flex;
    align-items: center;
    padding: 0 32px;
    background: var(--brand-surface);
    border-bottom: 1px solid var(--brand-border);
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    color: var(--brand-text);
}

.brand-logo {
    height: 28px;
    width: auto;
}

.brand-divider {
    width: 1px;
    height: 22px;
    background: var(--brand-border);
}

.brand-product {
    font-size: 15px;
    font-weight: 600;
    color: var(--brand-navy);
    letter-spacing: 0.2px;
}

.hero {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    padding: 48px 24px 80px;
    gap: 24px;
}

.hero-card {
    width: 100%;
    max-width: 540px;
    background: var(--brand-surface);
    border: 1px solid var(--brand-border);
    border-radius: var(--brand-radius-lg);
    padding: 36px 36px 32px;
    box-shadow: var(--brand-shadow);
}

.hero-title {
    font-size: 28px;
    font-weight: 700;
    color: var(--brand-navy);
    margin: 0 0 8px;
    letter-spacing: -0.3px;
}

.hero-sub {
    color: var(--brand-muted);
    margin: 0 0 28px;
    font-size: 14px;
}

.join-form label {
    display: block;
    font-size: 13px;
    font-weight: 500;
    color: var(--brand-muted);
    margin-bottom: 8px;
}

.input-group {
    display: flex;
    gap: 8px;
}

.input-group input[type=text] {
    flex: 1;
    padding: 12px 14px;
    border: 1px solid var(--brand-border);
    border-radius: var(--brand-radius);
    background: var(--brand-surface);
    color: var(--brand-text);
    font-size: 15px;
    transition: border-color 0.15s, box-shadow 0.15s;
}

.input-group input[type=text]:focus {
    outline: none;
    border-color: var(--brand-primary);
    box-shadow: 0 0 0 3px var(--brand-primary-soft);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 22px;
    border: none;
    border-radius: var(--brand-radius);
    font-size: 14px;
    font-weight: 600;
    letter-spacing: 0.2px;
    cursor: pointer;
    transition: background 0.15s, transform 0.05s, box-shadow 0.15s;
    user-select: none;
}

.btn-primary {
    background: var(--brand-primary);
    color: #fff;
    box-shadow: 0 2px 0 rgba(31, 126, 179, 0.35);
}

.btn-primary:hover {
    background: var(--brand-primary-dark);
}

.btn-primary:active {
    transform: translateY(1px);
    box-shadow: none;
}

.error-text {
    color: var(--brand-danger);
    font-weight: 500;
    margin: 14px 0 0;
    min-height: 18px;
    font-size: 13px;
}

.groups-card {
    width: 100%;
    max-width: 540px;
    background: var(--brand-surface);
    border: 1px solid var(--brand-border);
    border-radius: var(--brand-radius-lg);
    padding: 24px 28px;
    box-shadow: var(--brand-shadow-sm);
}

.groups-card.nogroups {
    display: none;
}

.groups-title {
    font-size: 13px;
    font-weight: 600;
    color: var(--brand-muted);
    text-transform: uppercase;
    letter-spacing: 0.6px;
    margin: 0 0 16px;
}

.groups-table {
    width: 100%;
    border-collapse: collapse;
}

.groups-table tr td {
    padding: 10px 0;
    border-bottom: 1px solid var(--brand-border);
}

.groups-table tr:last-child td {
    border-bottom: none;
}

.groups-table a {
    color: var(--brand-primary);
    font-weight: 600;
    font-size: 15px;
}

.groups-table a:hover {
    color: var(--brand-primary-dark);
    text-decoration: underline;
}

.footer {
    text-align: center;
    color: var(--brand-muted);
    font-size: 12.5px;
    padding: 24px 16px 32px;
    border-top: 1px solid var(--brand-border);
    background: var(--brand-surface);
}

@media (max-width: 600px) {
    .topbar { padding: 0 16px; }
    .hero { padding: 24px 16px 48px; }
    .hero-card { padding: 24px 22px; }
    .hero-title { font-size: 24px; }
    .input-group { flex-direction: column; }
}

#errormessage:empty { display: none; }