.auth-gate {
    position: fixed;
    inset: 0;
    z-index: 1000;
    display: grid;
    place-items: center;
    padding: 24px;
    background:
        radial-gradient(circle at 18% 14%, rgba(217, 107, 56, .14), transparent 30%),
        radial-gradient(circle at 82% 82%, rgba(49, 95, 77, .18), transparent 34%),
        rgba(243, 240, 232, .96);
    backdrop-filter: blur(18px);
}
.auth-gate[hidden] { display: none; }
.auth-card {
    width: min(100%, 430px);
    padding: 42px;
    border: 1px solid var(--line);
    border-radius: 22px;
    background: var(--paper);
    box-shadow: 0 28px 80px rgba(34, 40, 32, .16);
}
.auth-brand { margin-bottom: 25px; }
.auth-card h1 {
    margin: 9px 0 10px;
    font: 500 42px/1.15 Georgia, "Songti SC", serif;
}
.auth-intro {
    margin: 0 0 28px;
    color: var(--muted);
    font-size: 14px;
}
.login-form { display: grid; gap: 10px; }
.login-form label {
    margin-top: 6px;
    color: var(--muted);
    font-size: 12px;
    font-weight: 700;
}
.login-form input {
    width: 100%;
    padding: 13px 14px;
    border: 1px solid var(--line);
    border-radius: 8px;
    outline: none;
    background: var(--bg);
    color: var(--ink);
}
.login-form input:focus {
    border-color: var(--green);
    box-shadow: 0 0 0 3px rgba(49, 95, 77, .12);
}
.login-error {
    min-height: 20px;
    margin: 2px 0 0;
    color: #b84d35;
    font-size: 12px;
}
.login-form .primary-button { border-radius: 8px; }
.login-form .primary-button:disabled { cursor: wait; opacity: .65; }
body.auth-locked { overflow: hidden; }
.profile-logout,
.profile-settings {
    border: 0;
    padding: 6px 9px;
    border-radius: 14px;
    background: transparent;
    color: var(--muted);
    cursor: pointer;
    font-size: 11px;
}
.profile-logout:hover,
.profile-settings:hover { background: var(--soft); color: var(--ink); }
body.dark .auth-gate {
    background:
        radial-gradient(circle at 18% 14%, rgba(217, 107, 56, .12), transparent 30%),
        radial-gradient(circle at 82% 82%, rgba(49, 95, 77, .24), transparent 34%),
        rgba(27, 32, 29, .96);
}
@media (max-width: 520px) {
    .auth-gate { padding: 16px; }
    .auth-card { padding: 32px 24px; border-radius: 18px; }
    .auth-card h1 { font-size: 36px; }
    .sidebar-profile > span,
    .sidebar-profile > div { display: none; }
    .profile-logout,
    .profile-settings { padding: 7px 10px; }
}