.merchant-auth-body {
    min-height: 100vh;
    margin: 0;
    background: linear-gradient(145deg, #0f172a 0%, #1e3a5f 45%, #0d9488 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1.5rem 1rem;
}

.merchant-auth-page {
    width: 100%;
    max-width: 420px;
}

.merchant-auth-brand {
    text-align: center;
    color: #f8fafc;
    margin-bottom: 1.5rem;
}

.merchant-auth-brand .brand-mark {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 3rem;
    height: 3rem;
    border-radius: 0.75rem;
    background: rgba(255, 255, 255, 0.12);
    font-weight: 700;
    font-size: 1.125rem;
    letter-spacing: 0.04em;
    margin-bottom: 0.75rem;
}

.merchant-auth-brand h1 {
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0 0 0.25rem;
}

.merchant-auth-brand p {
    margin: 0;
    font-size: 0.875rem;
    color: rgba(248, 250, 252, 0.75);
}

.merchant-auth-card {
    background: #ffffff;
    border-radius: 1rem;
    box-shadow: 0 20px 50px rgba(15, 23, 42, 0.35);
    overflow: hidden;
}

.merchant-auth-tabs {
    display: flex;
    border-bottom: 1px solid #e2e8f0;
    background: #f8fafc;
}

.merchant-auth-tab {
    flex: 1;
    border: none;
    background: transparent;
    padding: 0.875rem 1rem;
    font-size: 0.875rem;
    font-weight: 600;
    color: #64748b;
    cursor: pointer;
    transition: color 0.15s ease, background 0.15s ease;
}

.merchant-auth-tab:hover {
    color: #0f766e;
}

.merchant-auth-tab.is-active {
    color: #0f766e;
    background: #ffffff;
    box-shadow: inset 0 -2px 0 #0d9488;
}

.merchant-auth-panel {
    display: none;
    padding: 1.5rem;
}

.merchant-auth-panel.is-active {
    display: block;
}

.merchant-auth-panel .panel-title {
    font-size: 1.125rem;
    font-weight: 700;
    color: #0f172a;
    margin-bottom: 0.25rem;
}

.merchant-auth-panel .panel-subtitle {
    font-size: 0.8125rem;
    color: #64748b;
    margin-bottom: 1.25rem;
}

.merchant-auth-panel .form-label {
    font-size: 0.8125rem;
    font-weight: 600;
    color: #334155;
    margin-bottom: 0.35rem;
}

.merchant-auth-panel .form-control,
.merchant-auth-panel .form-select {
    font-size: 0.9375rem;
    border-radius: 0.5rem;
    border-color: #cbd5e1;
    padding: 0.625rem 0.75rem;
}

.merchant-auth-panel .form-control:focus,
.merchant-auth-panel .form-select:focus {
    border-color: #0d9488;
    box-shadow: 0 0 0 0.2rem rgba(13, 148, 136, 0.15);
}

.merchant-auth-panel .btn-primary {
    background: #0d9488;
    border-color: #0d9488;
    border-radius: 0.5rem;
    font-weight: 600;
    padding: 0.625rem 1rem;
}

.merchant-auth-panel .btn-primary:hover {
    background: #0f766e;
    border-color: #0f766e;
}

.merchant-auth-panel .form-check-label {
    font-size: 0.8125rem;
    color: #475569;
}

.merchant-auth-footer {
    text-align: center;
    margin-top: 1.25rem;
    font-size: 0.8125rem;
    color: rgba(248, 250, 252, 0.8);
}

.merchant-auth-divider {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin: 1.25rem 0;
    color: #94a3b8;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.merchant-auth-divider::before,
.merchant-auth-divider::after {
    content: "";
    flex: 1;
    height: 1px;
    background: #e2e8f0;
}

.validation-summary-errors ul {
    margin-bottom: 0;
    padding-left: 1.1rem;
}

@media (max-width: 575.98px) {
    .merchant-auth-body {
        padding: 1rem 0.75rem;
        align-items: flex-start;
        padding-top: 2rem;
    }

    .merchant-auth-panel {
        padding: 1.25rem;
    }
}