.kn-auth{
    --kn-auth-glow-a: #ebe4ff;
    --kn-auth-glow-b: #f3e8ff;
    --kn-auth-glow-c: #e4e7ff;
    --kn-auth-beam: rgba(139, 92, 246, .30);
    --yb-accent: #7c3aed;
    --yb-accent-strong: #6d28d9;
    position: relative;
    overflow-x: hidden;
    animation: kn-auth-drift 18s ease-in-out infinite alternate;
    margin: 0;
    min-height: 100vh;
    font: 14px/1.5 "Onest", var(--yb-font);
    color: var(--yb-text);
    background:
        radial-gradient(40% 50% at 15% 20%, var(--kn-auth-glow-c), transparent 70%),
        radial-gradient(45% 55% at 85% 78%, var(--kn-auth-glow-b), transparent 70%),
        radial-gradient(60% 60% at 50% 50%, var(--kn-auth-glow-a), transparent 75%),
        var(--yb-bg);
    -webkit-font-smoothing: antialiased;
}
.kn-auth *, .kn-auth *::before, .kn-auth *::after{ box-sizing: border-box; }

.kn-auth-stage{
    min-height: 100vh;
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    place-items: center;
    align-content: center;
    gap: 16px;
    padding: 48px max(16px, env(safe-area-inset-right, 0px)) 48px max(16px, env(safe-area-inset-left, 0px));
}

.kn-auth-card{
    width: 100%;
    max-width: 420px;
    display: grid;
    gap: 18px;
    padding: 36px 32px 28px;
    background: var(--yb-surface);
    border: 1px solid var(--yb-border);
    border-radius: 18px;
}

.kn-auth-logo{ justify-self: center; width: auto; height: 60px; }

.kn-auth-head{ display: grid; gap: 6px; text-align: center; margin-bottom: 4px; }
.kn-auth-head h1{ margin: 0; font-size: 22px; font-weight: 600; letter-spacing: -.02em; line-height: 1.2; color: var(--yb-text); }
.kn-auth-head p{ margin: 0; color: var(--yb-text-muted); font-size: 14px; }

.kn-auth-alert{ border-radius: 10px; padding: 10px 14px; font-size: 13px; border: 1px solid transparent; }
.kn-auth-alert.is-error{ background: var(--yb-danger-weak); color: var(--yb-danger-strong); border-color: color-mix(in srgb, var(--yb-danger) 25%, transparent); }
.kn-auth-alert.is-ok{ background: var(--yb-ok-weak); color: var(--yb-ok); border-color: color-mix(in srgb, var(--yb-ok) 25%, transparent); }

.kn-auth-social{ display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
.kn-auth-provider{
    height: 44px;
    display: grid;
    place-items: center;
    border: 1px solid var(--yb-border);
    border-radius: 10px;
    background: var(--yb-surface);
    color: var(--yb-text);
    cursor: not-allowed;
}
.kn-auth-provider:disabled{ opacity: 1; }

.kn-auth-divider{ display: flex; align-items: center; gap: 12px; color: var(--yb-text-faint); font-size: 12px; }
.kn-auth-divider::before, .kn-auth-divider::after{ content: ""; flex: 1; height: 1px; background: var(--yb-border); }

.kn-auth-form{ display: grid; gap: 16px; }
.kn-auth-field{ display: grid; gap: 7px; }
.kn-auth-field label{ font-size: 13px; font-weight: 500; color: var(--yb-text); }

.kn-auth a{ color: var(--yb-accent); text-decoration: none; font-size: 13px; font-weight: 500; }
.kn-auth a:hover{ color: var(--yb-accent-strong); text-decoration: underline; }

.kn-auth-input{
    width: 100%;
    height: 44px;
    padding: 0 14px;
    font: inherit;
    font-size: 14px;
    color: var(--yb-text);
    background: var(--yb-surface);
    border: 1px solid var(--yb-border);
    border-radius: 10px;
    outline: none;
    transition: border-color var(--yb-dur) var(--yb-ease), box-shadow var(--yb-dur) var(--yb-ease);
}
.kn-auth-input:focus{ border-color: var(--yb-accent); box-shadow: var(--yb-ring); }
.kn-auth-input:disabled{ background: var(--yb-bg); color: var(--yb-text-muted); }

.kn-auth-password{ position: relative; }
.kn-auth-password .kn-auth-input{ padding-right: 44px; }
.kn-auth-reveal{
    position: absolute;
    top: 0;
    right: 0;
    width: 44px;
    height: 44px;
    display: grid;
    place-items: center;
    border: 0;
    background: none;
    color: var(--yb-text-faint);
    cursor: pointer;
}
.kn-auth-reveal:hover{ color: var(--yb-text); }

.kn-auth-submit{
    height: 44px;
    border: 0;
    border-radius: 10px;
    background: var(--yb-accent);
    color: var(--yb-accent-text);
    font: inherit;
    font-weight: 600;
    cursor: pointer;
    transition: background-color var(--yb-dur) var(--yb-ease);
}
.kn-auth-submit:hover{ background: var(--yb-accent-strong); }
.kn-auth-submit:focus-visible, .kn-auth-provider:focus-visible, .kn-auth-reveal:focus-visible{ outline: none; box-shadow: var(--yb-ring); }
.kn-auth-submit:disabled{ opacity: .7; cursor: progress; }

.kn-auth-foot{ border-top: 1px solid var(--yb-border); padding-top: 16px; text-align: center; color: var(--yb-text-muted); font-size: 13px; }

@media (max-width: 480px){
    .kn-auth-card{ padding: 28px 20px 22px; }
}
.kn-auth-link.is-disabled{ color: var(--yb-text-faint); font-weight: 500; cursor: not-allowed; }
.kn-auth.kn-tone-violet{
    --yb-bg: #efeafd;
    --kn-auth-glow-a: #ddd2ff;
    --kn-auth-glow-b: #e9d5ff;
    --kn-auth-glow-c: #d9dcff;
    --kn-auth-beam: rgba(124, 58, 237, .30);
}
@property --kn-auth-x{ syntax: '<percentage>'; inherits: true; initial-value: 50%; }
@property --kn-auth-y{ syntax: '<percentage>'; inherits: true; initial-value: 35%; }
.kn-auth::before{
    content: "";
    position: fixed;
    inset: 0;
    z-index: 0;
    pointer-events: none;
    background: radial-gradient(560px circle at var(--kn-auth-x) var(--kn-auth-y), var(--kn-auth-beam), transparent 70%);
}
.kn-auth-stage{ position: relative; z-index: 1; }
.kn-auth.is-tracking{ animation: none; transition: --kn-auth-x .5s ease-out, --kn-auth-y .5s ease-out; }
@keyframes kn-auth-drift{
    0%{ --kn-auth-x: 18%; --kn-auth-y: 22%; }
    50%{ --kn-auth-x: 78%; --kn-auth-y: 38%; }
    100%{ --kn-auth-x: 42%; --kn-auth-y: 82%; }
}
.kn-auth-alt{ justify-self: center; }
.kn-auth-switch{ justify-self: center; display: inline-flex; align-items: center; gap: 8px; padding: 8px 14px; border-radius: 999px; background: color-mix(in srgb, var(--yb-surface) 70%, transparent); border: 1px solid var(--yb-border); color: var(--yb-text-muted); }
.kn-auth a.kn-auth-switch:hover{ color: var(--yb-accent); text-decoration: none; }
@media (prefers-reduced-motion: reduce){
    .kn-auth{ animation: none; }
}