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

[x-cloak] {
    display: none !important;
}

/* interpolate-size: enables height transition to/from `auto` for collapsibles. */
html {
    -webkit-text-size-adjust: 100%;
    interpolate-size: allow-keywords;
}

body {
    margin: 0;
    min-height: 100dvh;
    background: var(--bg);
    color: var(--text);
    font-family: var(--font-body);
    font-size: var(--text-base);
    line-height: var(--leading-body);
    font-weight: 400;
    -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3 {
    font-family: var(--font-display);
    letter-spacing: var(--display-tracking);
    line-height: var(--leading-tight);
    margin: 0;
}

h1 {
    font-size: var(--text-2xl);
    font-weight: 800;
}

h2 {
    font-size: var(--text-xl);
    font-weight: 700;
}

h3 {
    font-size: var(--text-lg);
    font-weight: 500;
}

p {
    margin: 0;
}

fieldset {
    min-width: 0;
    margin-block: 0;
    margin-inline: 0;
    padding: 0;
    border: 0;
}

legend {
    padding: 0;
}

a {
    color: var(--text);
    text-decoration-color: var(--accent);
    text-underline-offset: 3px;
}

a:hover {
    text-decoration-thickness: 2px;
}

/* Use --text for focus rings: a brand accent color may fail WCAG non-text contrast. */
:focus-visible {
    outline: var(--focus-ring);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    margin: -1px;
    padding: 0;
    overflow: hidden;
    clip-path: inset(50%);
    white-space: nowrap;
    border: 0;
}

.skip-link {
    position: absolute;
    top: var(--space-2);
    left: var(--space-2);
    width: 1px;
    height: 1px;
    margin: -1px;
    padding: 0;
    overflow: hidden;
    clip-path: inset(50%);
    white-space: nowrap;
    border: 0;
    z-index: var(--z-overlay);
    background: var(--surface);
    color: var(--text);
    border-radius: var(--radius-md);
}

.skip-link:focus-visible {
    width: auto;
    height: auto;
    margin: 0;
    padding: var(--space-2) var(--space-4);
    overflow: visible;
    clip-path: none;
    white-space: normal;
    outline: var(--focus-ring);
    outline-offset: 2px;
}

/* The UA [hidden] rule is namespaced to HTML, so an SVG needs explicit display: none. */
.icon-sprite {
    display: none;
}

/* Author `display` on a component (.message, buttons, flex rows) beats the UA [hidden] rule. */
[hidden] {
    display: none !important;
}

.icon {
    width: var(--icon-size);
    height: var(--icon-size);
    flex: none;
    color: inherit;
}

.icon--sm {
    width: var(--icon-size-sm);
    height: var(--icon-size-sm);
}

.icon--xl {
    width: 40px;
    height: 40px;
}

.icon--spin {
    animation: spin var(--duration-spin) linear infinite;
}

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

.layout {
    min-height: 100dvh;
    display: flex;
    flex-direction: column;
}

.brand-rule {
    height: 4px;
    background: var(--brand-gradient);
    flex: none;
}

.topbar {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-2) var(--space-4);
    background: var(--surface);
    border-bottom: 1px solid var(--border);
}

.topbar__menu-button {
    grid-column: 1;
    justify-self: start;
}

.logo {
    grid-column: 2;
}

.topbar__menu-button {
    display: none;
    align-items: center;
    justify-content: center;
    min-width: var(--tap-target);
    min-height: var(--tap-target);
    border: 1px solid var(--border-input);
    border-radius: var(--radius-sm);
    background: var(--surface);
    color: var(--text);
    cursor: pointer;

    touch-action: manipulation;
    transition: background var(--duration-fast) var(--easing),
        border-color var(--duration-fast) var(--easing);
}

.js .topbar__menu-button {
    display: inline-flex;
}

.topbar__menu-button.disclosure--open {
    background: var(--accent-soft);
    border-color: var(--text);
}

.topbar__menu-icons {
    display: grid;
    place-items: center;
}

.topbar__menu-icon {
    grid-area: 1 / 1;
    transition: opacity var(--duration-fast) var(--easing),
        transform var(--duration-fast) var(--easing);
}

.topbar__menu-icon--open,
.disclosure--open .topbar__menu-icon--closed {
    opacity: 0;
    transform: rotate(-90deg);
}

.disclosure--open .topbar__menu-icon--open {
    opacity: 1;
    transform: rotate(0deg);
}

.topbar__menu-button:hover {
    background: var(--surface-sunken);
}

.topbar__menu-button:active {
    background: var(--accent-soft);
}

.topbar__user {
    grid-column: 3;
    justify-self: end;
    min-width: 0;
    color: var(--muted);
    font-size: var(--text-sm);
}

.logo {
    display: inline-flex;
    align-items: center;
    text-decoration: none;
}

.logo__image {
    display: block;
    height: 44px;
    width: auto;
}

.profile-menu {
    position: relative;
}

.profile-menu__trigger.disclosure--open,
.profile-menu__trigger.disclosure--open:hover {
    background: var(--accent-soft);
    color: var(--text);
}

.profile-menu__identity {
    display: flex;
    flex-direction: column;
    margin: 0 0 var(--space-2);
    padding: var(--space-2) var(--space-3) var(--space-3);
    border-bottom: 1px solid var(--border);
    overflow-wrap: anywhere;
}

.profile-menu__name {
    font-weight: 500;
}

.profile-menu__email {
    color: var(--muted);
    font-size: var(--text-sm);
}

.auth {
    min-height: 100dvh;
    display: flex;
    flex-direction: column;
}

.auth__main {
    flex: 1;
    display: grid;
    place-items: center;
    padding: var(--space-5) var(--space-4);
}

.auth__card {
    width: 100%;
    max-width: 400px;
}

.auth__logo {
    display: block;
    height: 88px;
    width: auto;
    margin-inline: auto;
}

.auth__title {
    text-align: center;
}

.auth__text {
    overflow-wrap: anywhere;
}

.auth__submit {
    width: 100%;
}

.auth__links {
    text-align: center;
}

.auth__link {
    display: inline-flex;
    align-items: center;
    min-height: var(--tap-target);
}

.shell {
    display: block;
    flex: 1;
}

.sidebar {
    display: grid;
    grid-template-rows: 1fr;
    background: var(--surface);
    border-right: 1px solid var(--border);
    width: 100%;
    transition: grid-template-rows var(--duration-slow) var(--easing);
}

.js .sidebar {
    grid-template-rows: 0fr;
}

.js .sidebar--open {
    grid-template-rows: 1fr;
}

.sidebar__panel {
    overflow: hidden;
    min-height: 0;
    transition: visibility var(--duration-slow) var(--easing);
}

.js .sidebar__panel {
    visibility: hidden;
}

.js .sidebar--open .sidebar__panel {
    visibility: visible;
}

.sidebar__nav {
    display: flex;
    flex-direction: column;

    gap: var(--space-5);

    padding: var(--space-4) var(--space-3);
}

.sidebar__group {
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
}

.sidebar__group--system {
    padding-top: var(--space-4);
    border-top: 1px solid var(--border);
}

.sidebar__heading {
    margin: 0;
    padding: 0 calc(var(--space-3) + var(--sidebar-edge)) var(--space-2);
    color: var(--muted);
    font-size: var(--text-xs);
    font-weight: 600;
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

.sidebar__link {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    min-height: var(--tap-target);
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-md);
    border-left: var(--sidebar-edge) solid transparent;
    color: var(--text);
    text-decoration: none;
    font-weight: 500;
    transition: background var(--duration-fast) var(--easing), border-color var(--duration-fast) var(--easing);
}

.sidebar__link:hover {
    background: var(--surface-sunken);
}

.sidebar__link:active {
    background: var(--accent-soft);
}

.sidebar__link--sub {
    padding-left: var(--space-6);
    font-size: var(--text-sm);
    font-weight: 400;
}

.sidebar__link--active {
    background: var(--accent-soft);
    border-left-color: var(--accent);
    font-weight: 500;
}

.sidebar__user {
    margin: 0 var(--space-3) var(--space-4);
    padding: var(--space-3) 0 0;
    border-top: 1px solid var(--border);
    color: var(--muted);
    font-size: var(--text-sm);
    overflow-wrap: anywhere;
}

.content {
    flex: 1;
    min-width: 0;
    padding: var(--space-4);
}

.page-header {
    display: flex;
    flex-wrap: wrap;
    align-items: flex-start;
    gap: var(--space-3);
    margin-bottom: var(--space-5);
}

.page-header__text {
    flex: 1 1 260px;
    min-width: 0;
}

.page-header__back {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    min-height: var(--tap-target);
    margin-top: calc(var(--space-2) * -1);
    margin-inline-start: calc(var(--space-2) * -1);
    padding-inline: var(--space-2);
    color: var(--muted);
    font-size: var(--text-sm);

    text-decoration-line: none;
}

/* Never --accent for this link: a brand accent may fail WCAG contrast against --bg for text. */
.page-header__back:hover,
.page-header__back:focus-visible {
    color: var(--text);
    text-decoration-line: underline;
}

.page-header__subtitle {
    color: var(--muted);
    font-size: var(--text-sm);
    margin-top: var(--space-1);
}

.page-header__actions {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
}

@media (max-width: 559.98px) {
    .page-header {
        display: grid;
        grid-template-columns: minmax(0, 1fr) auto;
        align-items: center;
        gap: var(--space-1) var(--space-2);
    }

    .page-header > .page-header__text {
        display: contents;
    }

    .page-header .page-header__back {
        grid-column: 1 / -1;
        justify-self: start;
    }

    .page-header > .page-header__text > h1 {
        grid-column: 1;
    }

    .page-header > .page-header__actions {
        grid-column: 1 / -1;
        justify-content: flex-start;
        flex-wrap: wrap;
        gap: var(--space-2);
    }

    .page-header :is(.page-header__subtitle, .page-header__meta) {
        grid-column: 1 / -1;
        order: 1;
        margin-top: 0;
    }

    .label-wide--phone {
        position: absolute;
        width: 1px;
        height: 1px;
        margin: -1px;
        padding: 0;
        overflow: hidden;
        clip-path: inset(50%);
        white-space: nowrap;
    }

    /* Header buttons carry a visible label at every width (S-3); only non-header uses still clip. */
    .page-header__actions .label-wide--phone {
        position: static;
        width: auto;
        height: auto;
        margin: 0;
        overflow: visible;
        clip-path: none;
        white-space: normal;
    }
}

.card {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    padding: var(--space-4);
}

.card > * {
    margin-block: 0;
}

/* A <details> body is one ::details-content box, so `.card { gap }` never reaches its children. */
.card.advanced::details-content {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.stack {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.stack > * {
    margin-block: 0;
}

@media (min-width: 768px) {
    .sidebar__user {
        display: none;
    }

    .content {
        padding: var(--space-5);
    }

    .card {
        padding: var(--space-5);
    }
}

@media (min-width: 1024px) {
    .js .topbar__menu-button {
        display: none;
    }

    .shell {
        display: flex;
        align-items: stretch;
    }

    .sidebar {
        display: block;
        position: sticky;
        top: 0;
        align-self: flex-start;
        height: 100dvh;
        overflow-y: auto;
        width: var(--sidebar-width);
        flex: none;
    }

    .js .sidebar__panel {
        visibility: visible;
        overflow: visible;
    }

    .topbar {
        grid-template-columns: auto 1fr;
    }

    .logo {
        grid-column: 1;
    }

    .topbar__user {
        grid-column: 2;
    }

    .content {
        padding: var(--space-6);
    }

    .content__inner {
        max-width: 1240px;
    }
}

/* * matches elements only; pseudo-elements need their own rule or they still animate. */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }

    *::details-content {
        transition-duration: 0.01ms !important;
    }
}

@media print {
    .layout {
        min-height: 0;
    }

    .brand-rule,
    .topbar,
    .sidebar {
        display: none;
    }
}