/**
 * Authentication layout — login composition only.
 * Uses shared tokens from style.css; does not depend on app-shell drawer behaviour.
 * Shell breakpoint: 900px (same as authenticated app shell).
 */

/* ----- Shell ----- */
.auth-body {
    margin: 0;
    min-height: 100dvh;
    background: var(--clr-surface);
    color: var(--clr-text-main);
}

.auth-layout {
    display: grid;
    grid-template-columns: minmax(300px, 38%) minmax(0, 1fr);
    min-height: 100dvh;
    background: var(--clr-surface);
}

/* ----- Brand rail (desktop) ----- */
.auth-brand-rail {
    position: relative;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    padding: var(--space-xl) var(--space-xl) var(--space-2xl);
    background: var(--clr-sidebar-bg);
    color: #fff;
    border-right: 1px solid rgba(255, 255, 255, 0.06);
}

.auth-brand-rail-content {
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
    gap: var(--space-3xl);
    max-width: 28rem;
    padding-top: var(--space-sm);
}

.auth-brand-lockup {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    min-width: 0;
    padding: var(--space-xs) 0;
    color: inherit;
    font-weight: var(--weight-semibold);
    font-size: var(--text-md);
    line-height: var(--leading-tight);
}

.auth-brand-logo {
    width: 28px;
    height: 28px;
    flex-shrink: 0;
    border-radius: var(--radius-sm);
}

.auth-brand-name {
    min-width: 0;
}

.auth-brand-hero {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    max-width: 22rem;
}

.auth-brand-statement {
    margin: 0;
    font-size: clamp(1.35rem, 1.1rem + 0.7vw, 1.75rem);
    font-weight: var(--weight-semibold);
    line-height: 1.3;
    letter-spacing: -0.01em;
    color: #fff;
}

.auth-brand-support {
    margin: 0;
    font-size: var(--text-sm);
    font-weight: var(--weight-regular);
    line-height: var(--leading-body);
    color: rgba(255, 255, 255, 0.62);
}

.auth-brand-visual {
    position: absolute;
    right: -12%;
    bottom: -8%;
    width: min(118%, 460px);
    height: auto;
    color: rgba(223, 245, 255, 0.78);
    opacity: 0.38;
    pointer-events: none;
    z-index: 0;
}

.auth-brand-visual-grid {
    opacity: 0.42;
}

.auth-brand-visual-arcs {
    opacity: 0.8;
}

.auth-brand-visual-course {
    opacity: 1;
}

.auth-brand-visual-marks {
    opacity: 0.9;
}

html[data-color-scheme="dark"] .auth-brand-rail {
    border-right-color: rgba(255, 255, 255, 0.04);
}

html[data-color-scheme="dark"] .auth-brand-visual {
    color: rgba(148, 163, 184, 0.95);
    opacity: 0.28;
}

html[data-color-scheme="dark"] .auth-brand-support {
    color: rgba(226, 232, 240, 0.55);
}

/* ----- Form panel ----- */
.auth-panel {
    display: flex;
    flex-direction: column;
    min-width: 0;
    min-height: 100dvh;
    background: var(--clr-surface);
}

.auth-panel-bar {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: var(--space-md);
    min-height: 56px;
    padding: var(--space-sm) var(--space-lg);
    background: transparent;
}

.auth-brand-lockup--bar {
    display: none;
}

.auth-main {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding: var(--space-xl) var(--space-lg) var(--space-3xl);
}

.auth-form {
    width: min(100%, 400px);
    margin-top: var(--space-2xl);
}

.auth-eyebrow {
    margin: 0 0 var(--space-sm);
    font-size: var(--text-xs);
    font-weight: var(--weight-semibold);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--clr-text-muted);
}

.auth-title {
    margin: 0 0 var(--space-sm);
    font-size: var(--text-xl);
    font-weight: var(--weight-semibold);
    line-height: var(--leading-tight);
    color: var(--clr-text-main);
}

.auth-form .section-copy {
    margin: 0 0 var(--space-xl);
    color: var(--clr-text-muted);
}

.auth-field {
    margin-bottom: var(--space-lg);
}

.auth-field label {
    display: block;
    font-size: var(--text-sm);
    font-weight: var(--weight-medium);
    margin-bottom: var(--space-xs);
    color: var(--clr-text-main);
}

.auth-form .form-control {
    min-height: 44px;
}

.auth-form .btn-primary {
    width: 100%;
    min-height: 44px;
    margin-top: var(--space-sm);
    font-weight: var(--weight-semibold);
}

.auth-alert-error {
    padding: var(--space-md) var(--space-lg);
    border: none;
    border-radius: var(--radius-md);
    margin-bottom: var(--space-lg);
    font-weight: var(--weight-medium);
    font-size: var(--text-sm);
    background: var(--clr-danger-bg);
    color: var(--clr-danger);
}

.auth-alert-success {
    padding: var(--space-md) var(--space-lg);
    border: none;
    border-radius: var(--radius-md);
    margin-bottom: var(--space-lg);
    font-weight: var(--weight-medium);
    font-size: var(--text-sm);
    background: var(--clr-success-bg);
    color: var(--clr-success);
}

.auth-field-aside {
    margin: var(--space-sm) 0 0;
    text-align: right;
}

.auth-link {
    color: var(--clr-ocean);
    font-size: var(--text-sm);
    font-weight: var(--weight-medium);
    text-decoration: none;
}

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

.auth-link:focus-visible {
    outline: none;
    box-shadow: var(--focus-ring);
    border-radius: var(--radius-sm);
}

.auth-footer-links {
    margin: var(--space-xl) 0 0;
    text-align: center;
}

.auth-copy-follow {
    margin-top: calc(-1 * var(--space-lg)) !important;
}

.auth-actions {
    margin: 0 0 var(--space-lg);
}

.auth-actions .btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    min-height: 44px;
    text-decoration: none;
    box-sizing: border-box;
}

/* ----- Theme toggle (login only; do not load layout.css) ----- */
.auth-panel-bar .color-scheme-toggle {
    width: 40px;
    height: 40px;
    padding: 0;
    border-radius: var(--radius-sm);
    border: 1px solid var(--clr-border);
    background: var(--clr-card);
    color: var(--clr-text-main);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition:
        background-color var(--transition),
        border-color var(--transition),
        color var(--transition),
        box-shadow var(--transition);
}

.auth-panel-bar .color-scheme-toggle:hover {
    background: var(--clr-surface-hover);
    color: var(--clr-ocean);
}

.auth-panel-bar .color-scheme-toggle:focus-visible {
    outline: none;
    box-shadow: var(--focus-ring);
}

.auth-panel-bar .color-scheme-toggle-icon {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

/* ----- Mobile / tablet: compact top brand bar ----- */
@media (max-width: 900px) {
    .auth-layout {
        grid-template-columns: minmax(0, 1fr);
        grid-template-rows: auto minmax(0, 1fr);
    }

    .auth-brand-rail {
        display: none;
    }

    .auth-panel {
        min-height: 100dvh;
    }

    .auth-panel-bar {
        justify-content: space-between;
        min-height: 52px;
        height: 52px;
        padding: 0 var(--space-lg);
        background: var(--clr-sidebar-bg);
        color: #fff;
        border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    }

    .auth-brand-lockup--bar {
        display: inline-flex;
        padding: 0;
    }

    .auth-panel-bar .color-scheme-toggle {
        border-color: rgba(255, 255, 255, 0.2);
        background: rgba(255, 255, 255, 0.08);
        color: #fff;
    }

    .auth-panel-bar .color-scheme-toggle:hover {
        background: rgba(255, 255, 255, 0.14);
        color: #fff;
    }

    .auth-panel-bar .color-scheme-toggle:focus-visible {
        box-shadow: 0 0 0 2px var(--clr-sidebar-bg), 0 0 0 4px var(--clr-ocean);
    }

    .auth-main {
        padding: var(--space-xl) var(--space-lg) var(--space-2xl);
        justify-content: center;
        align-items: flex-start;
    }

    .auth-form {
        width: min(100%, 400px);
        margin-top: var(--space-lg);
    }
}

@media (max-width: 480px) {
    .auth-panel-bar {
        padding: 0 var(--space-md);
    }

    .auth-main {
        padding: var(--space-lg) var(--space-md) var(--space-xl);
    }

    .auth-form {
        margin-top: var(--space-md);
    }

    .auth-title {
        font-size: var(--text-lg);
    }
}