body {
    background: var(--panel-auth-bg, #f4f6f9);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}
.auth-container {
    width: 100%;
    max-width: 420px;
    padding: 1.5rem;
}
.auth-brand {
    text-align: center;
    margin-bottom: 2rem;
}
.auth-brand-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 56px;
    height: 56px;
    border-radius: var(--panel-radius, 12px);
    background: var(--panel-primary, #4f46e5);
    color: #fff;
    margin-bottom: 0.75rem;
}
.auth-brand-name {
    font-size: 1.1rem;
    font-weight: 700;
    color: #1e293b;
}
.auth-card {
    background: #fff;
    border-radius: var(--panel-radius, 8px);
    border: 1px solid #e2e8f0;
    box-shadow: 0 4px 16px rgba(0,0,0,0.06);
    padding: 2rem;
}
.auth-title {
    font-size: 1.2rem;
    font-weight: 700;
    color: #1e293b;
    margin: 0 0 0.25rem;
    text-align: center;
}
.auth-subtitle {
    font-size: 0.8rem;
    color: #64748b;
    margin: 0 0 1.5rem;
    text-align: center;
}
.auth-field { margin-bottom: 1rem; }
.auth-label {
    display: block;
    font-size: 0.8rem;
    font-weight: 600;
    color: #374151;
    margin-bottom: 0.35rem;
}
.auth-input {
    width: 100%;
    padding: 0.55rem 0.85rem;
    border: 1px solid #d1d5db;
    border-radius: calc(var(--panel-radius, 8px) - 2px);
    font-size: 0.875rem;
    font-family: var(--panel-font, sans-serif);
    transition: border-color 0.15s, box-shadow 0.15s;
    outline: none;
    background: #fff;
    color: #1e293b;
}
.auth-input:focus {
    border-color: var(--panel-primary, #4f46e5);
    box-shadow: 0 0 0 3px color-mix(in srgb, var(--panel-primary, #4f46e5) 15%, transparent);
}
.auth-input.invalid { border-color: var(--panel-danger, #dc3545); }
.auth-error { font-size: 0.78rem; color: var(--panel-danger, #dc3545); margin-top: 0.3rem; }
.auth-check {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1.25rem;
    cursor: pointer;
}
.auth-check input { cursor: pointer; accent-color: var(--panel-primary, #4f46e5); }
.auth-check-label { font-size: 0.8rem; color: #374151; }
.auth-footer {
    margin-top: 1.25rem;
    text-align: center;
    font-size: 0.8rem;
    color: #64748b;
}
.auth-footer a {
    color: var(--panel-primary, #4f46e5);
    text-decoration: none;
    font-weight: 500;
}
.auth-footer a:hover { text-decoration: underline; }
.auth-divider { margin: 0 0.4rem; }

html[data-theme="dark"] body { background: var(--panel-auth-bg, #0f172a); }
html[data-theme="dark"] .auth-brand-name { color: var(--panel-text-primary, #e2e8f0); }
html[data-theme="dark"] .auth-card { background: var(--panel-card-bg, #1e293b); border-color: var(--panel-card-border, #334155); }
html[data-theme="dark"] .auth-title { color: var(--panel-text-primary, #e2e8f0); }
html[data-theme="dark"] .auth-subtitle { color: var(--panel-text-muted, #64748b); }
html[data-theme="dark"] .auth-label { color: var(--panel-text-primary, #e2e8f0); }
html[data-theme="dark"] .auth-input { background: var(--panel-content-bg, #0f172a); border-color: var(--panel-card-border, #334155); color: var(--panel-text-primary, #e2e8f0); }
html[data-theme="dark"] .auth-input:focus { border-color: var(--panel-primary, #4f46e5); }
html[data-theme="dark"] .auth-check-label { color: var(--panel-text-primary, #e2e8f0); }
html[data-theme="dark"] .auth-footer { color: var(--panel-text-muted, #64748b); }