.err-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 320px;
    padding: 24px 0;
}

.err-card {
    width: 100%;
    max-width: 520px;
    margin: 0 auto;
    padding: 40px 36px;
    text-align: center;
    background: #ffffff;
    border-radius: 12px;
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.06);
}

.err-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 56px;
    height: 56px;
    margin-bottom: 20px;
    border-radius: 50%;
    background: #e8f7fc;
    color: #00ace6;
    font-size: 28px;
    font-weight: 600;
    line-height: 1;
}

.err-title {
    margin: 0 0 12px;
    color: #1a2b3c;
    font-size: 1.5rem;
    font-weight: 600;
    line-height: 1.3;
}

.err-message {
    margin: 0 0 24px;
    color: #5a6a7a;
    font-size: 1rem;
    line-height: 1.55;
}

.err-ref {
    margin: -8px 0 24px;
    color: #8a96a3;
    font-size: 0.85rem;
}

.err-ref code {
    color: #5a6a7a;
    font-size: 0.85rem;
}

.err-actions {
    display: flex;
    justify-content: center;
}

.err-btn {
    display: inline-block;
    padding: 10px 28px;
    border-radius: 6px;
    background: #00ace6;
    color: #ffffff !important;
    font-size: 0.95rem;
    font-weight: 600;
    text-decoration: none;
    transition: background 0.15s ease;
}

.err-btn:hover,
.err-btn:focus {
    background: #0096d6;
    color: #ffffff !important;
    text-decoration: none;
}