.auth-wrapper {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px 16px;
    background: transparent;
    position: relative;
    overflow: hidden;
}

.auth-wrapper::before,
.auth-wrapper::after {
    content: none;
}

.auth-card {
    width: 100%;
    max-width: 440px;
    border-radius: 18px;
    padding: 28px;
    border: 1px solid #e5e7eb;
    color: #1f2937;
    background: #ffffff;
    box-shadow: 0 12px 32px rgba(15, 23, 42, 0.14);
}

.brand-badge .dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: radial-gradient(closest-side, #a5b4fc, #6366F1);
    box-shadow: 0 0 12px #818cf8;
}

.auth-title {
    color: #312e81;
    font-weight: 800;
    letter-spacing: .2px;
    margin: 4px 0 8px;
    text-align: center;
}

.auth-subtitle {
    color: #4b5563;
    margin-bottom: 18px;
    text-align: center;
}

.form-floating > .form-control,
.form-floating > .form-control-plaintext {
    background-color: #f8fafc;
    border: 1px solid #cbd5e1;
    color: #111827;
}

/* Bootstrap floating label 依赖透明 placeholder，否则会和 label 叠字 */
.form-floating > .form-control::placeholder,
.form-floating > .form-control::-moz-placeholder {
    color: transparent !important;
    opacity: 0 !important;
}

.form-floating > label {
    color: #64748b;
}

.form-floating > .form-control:focus ~ label,
.form-floating > .form-control:not(:placeholder-shown) ~ label,
.form-floating > .form-control-plaintext ~ label {
    color: #4f46e5;
    opacity: 1;
}

.form-control:focus {
    border-color: #6366F1;
    box-shadow: 0 0 0 .25rem rgba(99, 102, 241, .2);
    background-color: #ffffff;
    color: #111827;
}

.btn-gradient {
    --g1: #6366F1;
    --g2: #22D3EE;
    background-image: linear-gradient(135deg, var(--g1), var(--g2));
    color: #fff;
    border: 0;
    border-radius: 12px;
    padding: 10px 16px;
    font-weight: 700;
    box-shadow: 0 6px 18px rgba(34, 211, 238, .25);
    transition: transform .08s ease, box-shadow .2s ease, filter .2s ease;
}

.btn-gradient:hover {
    filter: brightness(1.05);
    transform: translateY(-1px);
    box-shadow: 0 10px 24px rgba(34, 211, 238, .32);
    color: #fff;
}

.btn-ghost {
    border-radius: 12px;
    border: 1px dashed #94a3b8;
    color: #2563eb;
    background: transparent;
}

.form-check-input {
    background-color: #ffffff;
    border: 1px solid #94a3b8;
}

.form-check-input:checked {
    background-color: #6366F1;
    border-color: #6366F1;
}

.divider {
    position: relative;
    text-align: center;
    margin: 18px 0;
    color: #64748b;
}

.divider::before,
.divider::after {
    content: "";
    position: absolute;
    top: 50%;
    width: 40%;
    height: 1px;
    background: linear-gradient(90deg, rgba(148, 163, 184, 0), rgba(148, 163, 184, .55), rgba(148, 163, 184, 0));
}

.divider::before {
    left: 0;
}

.divider::after {
    right: 0;
}

.text-link {
    color: #4f46e5;
    text-decoration: none;
    font-weight: 600;
}

.text-link:hover {
    color: #4338ca;
    text-decoration: underline;
}

.input-icon-end {
    position: relative;
}

.input-icon-end .toggle-pass {
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    cursor: pointer;
    opacity: .8;
}

@media (max-width: 576px) {
    .auth-card {
        padding: 22px;
    }
}

.brand-header {
    margin-bottom: 2rem;
    text-align: center;
}

.brand-logo {
    display: inline-flex;
    align-items: center;
    margin-bottom: 1rem;
    justify-content: center;
}

.brand-icon {
    width: 64px;
    height: 64px;
    border-radius: 12px;
    box-shadow: 0 4px 16px rgba(99, 102, 241, 0.3);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.brand-icon:hover {
    transform: scale(1.05);
    box-shadow: 0 6px 20px rgba(99, 102, 241, 0.4);
}

.form-check {
    padding: 0;
    margin: 0;
    color: #374151;
    display: flex;
    align-items: center;
    gap: 4px;
}

.form-check input[type="checkbox"] {
    appearance: none;
    -webkit-appearance: none;
    width: 16px;
    height: 16px;
    border: 2px solid rgba(99, 102, 241, 0.45);
    border-radius: 4px;
    background: #ffffff;
    cursor: pointer;
    position: relative;
    transition: all 0.2s ease;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.08);
}

.form-check input[type="checkbox"]:hover {
    border-color: rgba(99, 102, 241, 0.75);
    box-shadow: 0 2px 8px rgba(99, 102, 241, 0.2);
}

.form-check input[type="checkbox"]:checked {
    background: linear-gradient(135deg, #6366F1, #22D3EE);
    border-color: #6366F1;
    box-shadow: 0 2px 8px rgba(99, 102, 241, 0.3);
}

.form-check input[type="checkbox"]:checked::after {
    content: '✓';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: white;
    font-size: 12px;
    font-weight: bold;
    line-height: 1;
}

.form-check label {
    cursor: pointer;
    user-select: none;
    font-size: 0.9rem;
    font-weight: 500;
    color: #374151;
    transition: color 0.2s ease;
}

.form-check label:hover {
    color: #4f46e5;
}

.image-code {
    border: 2px solid #e5e7eb;
    border-radius: 10px;
    margin-left: -15px;
    opacity: 1;
    cursor: pointer;
    height: 48px;
    background: #fff;
}

.prompt-image-code {
    border: 2px solid #e5e7eb;
    border-radius: 10px;
    cursor: pointer;
    height: 48px;
    background: #fff;
}

.btn-ghost:hover {
    color: #1d4ed8;
    border: 1px dashed rgba(37, 99, 235, 0.45);
}

.auth-card .text-center,
.auth-card .small,
.auth-card p {
    color: #4b5563;
}

a {
    text-decoration: none;
}