*, *::before, *::after {
    box-sizing: border-box;
}

html {
    min-width: 320px;
    min-height: 100%;
    background: var(--z-bg-page);
}

body.z-auth-page {
    min-height: 100vh;
    margin: 0;
    background: var(--z-bg-page);
    color: var(--z-text-primary);
    font-family: var(--z-font-sans);
    font-size: var(--z-font-size-md);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

button,
input {
    font: inherit;
}

a {
    color: var(--z-primary);
    text-underline-offset: 0.2em;
}

a:hover {
    color: var(--z-primary-hover);
}

.z-skip-link {
    position: fixed;
    top: var(--z-space-3);
    left: var(--z-space-3);
    z-index: 100;
    padding: var(--z-space-3) var(--z-space-4);
    transform: translateY(-150%);
    border: 1px solid var(--z-border-default);
    border-radius: var(--z-radius-sm);
    background: var(--z-bg-surface-elevated);
    color: var(--z-text-primary);
    box-shadow: var(--z-shadow-md);
}

.z-skip-link:focus {
    transform: translateY(0);
}

.z-auth-shell {
    display: grid;
    grid-template-columns: minmax(20rem, 0.82fr) minmax(25rem, 1.18fr);
    min-height: calc(100vh - 3rem);
}

.z-auth-brand-panel {
    display: flex;
    min-height: calc(100vh - 3rem);
    flex-direction: column;
    justify-content: space-between;
    padding: clamp(2rem, 5vw, 4.5rem);
    background: var(--z-bg-sidebar);
    color: var(--z-text-primary);
}

.z-auth-brand {
    display: inline-flex;
    width: fit-content;
}

.z-auth-brand img {
    display: block;
    width: min(13rem, 62vw);
    height: auto;
}

.z-auth-brand-copy {
    max-width: 31rem;
    margin: auto 0;
    padding: var(--z-space-12) 0;
}

.z-auth-eyebrow {
    margin: 0 0 var(--z-space-4);
    color: var(--z-primary);
    font-size: var(--z-type-eyebrow-size);
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.z-auth-brand-copy h1 {
    max-width: 15ch;
    margin: 0;
    color: var(--z-text-page-title);
    font-size: clamp(2rem, 4vw, 3.35rem);
    line-height: 1.08;
    letter-spacing: -0.035em;
}

.z-auth-brand-copy p {
    max-width: 39rem;
    margin: var(--z-space-5) 0 0;
    color: var(--z-text-secondary);
    font-size: var(--z-font-size-lg);
}

.z-auth-version {
    color: var(--z-text-muted);
    font-size: var(--z-type-helper-size);
}

.z-auth-main {
    display: grid;
    align-items: center;
    justify-items: center;
    min-width: 0;
    padding: clamp(1.25rem, 5vw, 5rem);
}

.z-auth-main-inner {
    width: min(100%, 29rem);
}

.z-auth-toolbar {
    display: flex;
    justify-content: flex-end;
    margin-bottom: var(--z-space-6);
}

.z-theme-toggle {
    display: inline-flex;
    align-items: center;
    min-height: var(--z-control-height);
    gap: var(--z-space-2);
    padding: var(--z-space-2) var(--z-space-3);
    border: 1px solid var(--z-border-default);
    border-radius: var(--z-radius-md);
    background: var(--z-bg-surface-elevated);
    color: var(--z-text-secondary);
    box-shadow: var(--z-shadow-xs);
    cursor: pointer;
    transition: border-color var(--z-transition-fast), background var(--z-transition-fast), color var(--z-transition-fast);
}

.z-theme-toggle:hover {
    border-color: var(--z-border-strong);
    background: var(--z-bg-surface-hover);
    color: var(--z-text-primary);
}

.z-theme-toggle svg {
    width: 1.15rem;
    height: 1.15rem;
    fill: none;
    stroke: currentColor;
    stroke-width: 1.8;
}

.z-auth-card {
    padding: clamp(1.5rem, 4vw, 2.5rem);
    border: 1px solid var(--z-border-default);
    border-radius: var(--z-radius-xl);
    background: var(--z-bg-surface-elevated);
    box-shadow: var(--z-shadow-md);
}

.z-auth-card-header {
    margin-bottom: var(--z-space-8);
}

.z-auth-card-header h2 {
    margin: 0;
    color: var(--z-text-section-title);
    font-size: clamp(1.65rem, 3vw, 2rem);
    line-height: 1.2;
    letter-spacing: -0.025em;
}

.z-auth-card-header p {
    margin: var(--z-space-2) 0 0;
    color: var(--z-text-secondary);
}

.z-auth-alert {
    margin: 0 0 var(--z-space-6);
    padding: var(--z-space-4);
    border: 1px solid var(--z-error-border);
    border-radius: var(--z-radius-md);
    background: var(--z-error-soft);
    color: var(--z-error);
}

.z-auth-alert ul {
    margin: 0;
    padding-inline-start: 1.25rem;
}

.z-auth-alert p {
    margin: 0;
}

.z-auth-alert-success {
    border-color: var(--z-success-border);
    background: var(--z-success-soft);
    color: var(--z-success);
}

.z-form {
    display: grid;
    gap: var(--z-space-5);
}

.z-field {
    display: grid;
    gap: var(--z-space-2);
}

.z-field label {
    color: var(--z-text-label);
    font-size: var(--z-font-size-sm);
    font-weight: 650;
}

.z-field-help {
    margin: 0;
    color: var(--z-text-muted);
    font-size: var(--z-type-helper-size);
}

.z-input-wrap {
    position: relative;
}

.z-input {
    width: 100%;
    min-height: var(--z-control-height);
    padding: var(--z-space-3);
    border: 1px solid var(--z-input-border);
    border-radius: var(--z-radius-md);
    outline: none;
    background: var(--z-input-surface);
    color: var(--z-input-text);
    transition: border-color var(--z-transition-fast), box-shadow var(--z-transition-fast), background var(--z-transition-fast);
}

.z-input:hover {
    border-color: var(--z-input-border-hover);
    background: var(--z-input-surface-hover);
}

.z-input:focus {
    border-color: var(--z-input-focus-border);
    background: var(--z-input-surface);
    box-shadow: var(--z-input-focus-ring);
}

.z-input::placeholder {
    color: var(--z-text-muted);
}

.z-input-wrap .z-input {
    padding-inline-end: 4.7rem;
}

.z-password-toggle {
    position: absolute;
    top: 50%;
    right: var(--z-space-2);
    min-width: 3.6rem;
    min-height: calc(var(--z-control-height) - var(--z-space-2));
    transform: translateY(-50%);
    border: 0;
    border-radius: var(--z-radius-sm);
    background: transparent;
    color: var(--z-text-label);
    font-size: var(--z-font-size-sm);
    font-weight: 700;
    cursor: pointer;
}

.z-password-toggle:hover {
    background: var(--z-bg-surface-hover);
}

.z-form-options {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--z-space-4);
    font-size: var(--z-font-size-sm);
}

.z-checkbox {
    display: inline-flex;
    align-items: center;
    gap: var(--z-space-2);
    color: var(--z-text-secondary);
    cursor: pointer;
}

.z-checkbox input {
    width: 1.15rem;
    height: 1.15rem;
    accent-color: var(--z-primary);
}

.z-auth-link {
    font-weight: 650;
    text-decoration: none;
}

.z-auth-link:hover {
    text-decoration: underline;
}

.z-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: var(--z-control-height);
    gap: var(--z-space-2);
    padding: var(--z-space-3) var(--z-space-4);
    border: 1px solid transparent;
    border-radius: var(--z-radius-md);
    font-weight: 700;
    text-decoration: none;
    cursor: pointer;
    transition: background var(--z-transition-fast), border-color var(--z-transition-fast), transform var(--z-transition-fast);
}

.z-button-primary {
    background: var(--z-primary);
    color: var(--z-primary-text);
    box-shadow: var(--z-shadow-sm);
}

.z-button-primary:hover {
    background: var(--z-primary-hover);
    color: var(--z-primary-text);
}

.z-button-primary:active {
    transform: translateY(1px);
    background: var(--z-primary-active);
}

.z-button:disabled,
.z-button[aria-disabled="true"] {
    cursor: wait;
    background: var(--z-bg-surface-disabled);
    color: var(--z-text-disabled);
    box-shadow: none;
}

.z-button-spinner {
    display: none;
    width: 1rem;
    height: 1rem;
    border: 2px solid var(--z-primary-text);
    border-top-color: transparent;
    border-radius: 50%;
    animation: z-spin 0.7s linear infinite;
}

.z-form.is-submitting .z-button-spinner {
    display: inline-block;
}

@keyframes z-spin {
    to { transform: rotate(360deg); }
}

.z-auth-secondary {
    margin: var(--z-space-6) 0 0;
    color: var(--z-text-muted);
    font-size: var(--z-font-size-sm);
    text-align: center;
}

.z-auth-footer {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 3rem;
    padding: var(--z-space-3) var(--z-space-4);
    border-top: 1px solid var(--z-border-subtle);
    background: var(--z-bg-surface);
    color: var(--z-text-muted);
    font-size: var(--z-type-helper-size);
}

:where(a, button):focus-visible {
    outline: 2px solid var(--z-focus-color);
    outline-offset: 2px;
    box-shadow: var(--z-focus-ring);
}

.z-input:focus-visible {
    outline: none;
}

@media (max-width: 56.25rem) {
    .z-auth-shell {
        grid-template-columns: minmax(0, 1fr);
    }

    .z-auth-brand-panel {
        min-height: auto;
        padding: var(--z-space-6) clamp(1.25rem, 6vw, 3rem);
    }

    .z-auth-brand-copy,
    .z-auth-version {
        display: none;
    }

    .z-auth-brand img {
        width: 10.5rem;
    }

    .z-auth-main {
        padding: var(--z-space-8) var(--z-space-5) var(--z-space-10);
    }
}

@media (max-width: 30rem) {
    .z-auth-main {
        padding: var(--z-space-6) var(--z-space-4) var(--z-space-8);
    }

    .z-auth-card {
        padding: var(--z-space-6) var(--z-space-5);
        border-radius: var(--z-radius-lg);
    }

    .z-form-options {
        align-items: flex-start;
        flex-direction: column;
    }

    .z-theme-toggle-label {
        position: absolute;
        width: 1px;
        height: 1px;
        overflow: hidden;
        clip: rect(0 0 0 0);
    }
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        scroll-behavior: auto;
        animation-duration: 0.01ms;
        animation-iteration-count: 1;
        transition-duration: 0.01ms;
    }
}