:root {
    --color-bg: #f4f6f8;
    --color-surface: #ffffff;
    --color-text: #17202a;
    --color-muted: #697586;
    --color-border: #d8dee6;
    --color-primary: #005f73;
    --color-primary-dark: #0a3f4c;
    --color-status-open: #0077b6;
    --color-status-parts: #c27c00;
    --color-status-customer: #7b2cbf;
    --color-status-closed: #2d6a4f;
    --color-danger: #b42318;
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --font-base: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    --font-size-sm: 0.875rem;
    --font-size-md: 1rem;
    --font-size-lg: 1.25rem;
    --font-size-xl: 1.75rem;
    --layout-sidebar-width: 18rem;
    --layout-content-max: 76rem;
    --shadow-panel: 0 1rem 2.5rem rgba(23, 32, 42, 0.08);
}

* {
    box-sizing: border-box;
}

html {
    min-height: 100%;
}

body {
    min-height: 100%;
    margin: 0;
    background: var(--color-bg);
    color: var(--color-text);
    font-family: var(--font-base);
    font-size: var(--font-size-md);
    line-height: 1.5;
}

a {
    color: inherit;
}

button,
input,
select {
    font: inherit;
}

.app-shell {
    min-height: 100vh;
}

.app-shell__nav-toggle {
    position: fixed;
    top: var(--space-md);
    left: var(--space-md);
    z-index: 30;
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    min-height: 2.75rem;
    border: 1px solid var(--color-border);
    background: var(--color-surface);
    color: var(--color-text);
    padding: 0 var(--space-md);
    cursor: pointer;
}

.app-shell__nav-icon,
.app-shell__nav-icon::before,
.app-shell__nav-icon::after {
    display: block;
    width: 1.125rem;
    height: 0.125rem;
    background: var(--color-text);
    content: "";
}

.app-shell__nav-icon {
    position: relative;
}

.app-shell__nav-icon::before,
.app-shell__nav-icon::after {
    position: absolute;
    left: 0;
}

.app-shell__nav-icon::before {
    top: -0.375rem;
}

.app-shell__nav-icon::after {
    top: 0.375rem;
}

.app-shell__sidebar {
    position: fixed;
    inset: 0 auto 0 0;
    z-index: 40;
    width: min(86vw, var(--layout-sidebar-width));
    transform: translateX(-100%);
    transition: transform 180ms ease;
}

.app-shell--nav-open .app-shell__sidebar {
    transform: translateX(0);
}

.app-shell__overlay {
    position: fixed;
    inset: 0;
    z-index: 35;
    display: none;
    background: rgba(23, 32, 42, 0.42);
}

.app-shell--nav-open .app-shell__overlay {
    display: block;
}

.app-shell__main {
    width: 100%;
    max-width: var(--layout-content-max);
    margin: 0 auto;
    padding: 5rem var(--space-md) var(--space-xl);
}

.sidebar {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    border-right: 1px solid var(--color-border);
    background: var(--color-surface);
    box-shadow: var(--shadow-panel);
}

.sidebar__top,
.sidebar__footer {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    padding: var(--space-lg);
}

.sidebar__logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    color: var(--color-text);
    font-weight: 700;
    text-decoration: none;
}

.sidebar__logo-image {
    width: 2.5rem;
    height: 2.5rem;
}

.sidebar__logo-text {
    letter-spacing: 0;
}

.sidebar__nav,
.sidebar__subnav {
    display: flex;
    flex-direction: column;
}

.sidebar__subnav {
    margin-left: var(--space-md);
    border-left: 1px solid var(--color-border);
}

.sidebar__link,
.sidebar__sublink,
.sidebar__logout {
    display: block;
    border: 0;
    background: transparent;
    color: var(--color-muted);
    padding: var(--space-sm) 0;
    text-align: left;
    text-decoration: none;
    cursor: pointer;
}

.sidebar__link--active,
.sidebar__link:hover,
.sidebar__sublink:hover,
.sidebar__logout:hover {
    color: var(--color-primary);
}

.sidebar__user {
    border-top: 1px solid var(--color-border);
    padding-top: var(--space-md);
}

.sidebar__username,
.sidebar__email {
    display: block;
}

.sidebar__username {
    font-weight: 700;
}

.sidebar__email {
    color: var(--color-muted);
    font-size: var(--font-size-sm);
    overflow-wrap: anywhere;
}

.sidebar__logout-form {
    margin: 0;
}

.content-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    margin-bottom: var(--space-lg);
}

.content-header__title {
    margin: 0;
    font-size: var(--font-size-xl);
    line-height: 1.15;
}

.content-header__subtitle {
    margin: var(--space-xs) 0 0;
    color: var(--color-muted);
}

.dashboard,
.customers,
.settings {
    display: grid;
    gap: var(--space-lg);
}

.status-grid {
    display: grid;
    gap: var(--space-md);
}

.status-card {
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: 6rem;
    border: 1px solid var(--color-border);
    border-left-width: 0.375rem;
    background: var(--color-surface);
    padding: var(--space-md);
}

.status-card--open {
    border-left-color: var(--color-status-open);
}

.status-card--parts {
    border-left-color: var(--color-status-parts);
}

.status-card--customer {
    border-left-color: var(--color-status-customer);
}

.status-card--closed {
    border-left-color: var(--color-status-closed);
}

.status-card__label {
    color: var(--color-muted);
}

.status-card__value {
    font-size: 2rem;
    line-height: 1;
}

.case-toolbar {
    display: grid;
    gap: var(--space-md);
    border: 1px solid var(--color-border);
    background: var(--color-surface);
    padding: var(--space-md);
}

.case-toolbar__search,
.case-toolbar__filter {
    display: grid;
    gap: var(--space-xs);
}

.case-toolbar__label {
    color: var(--color-muted);
    font-size: var(--font-size-sm);
    font-weight: 700;
}

.case-toolbar__input,
.case-toolbar__select {
    width: 100%;
    min-height: 2.75rem;
    border: 1px solid var(--color-border);
    background: var(--color-surface);
    color: var(--color-text);
    padding: 0 var(--space-md);
}

.case-toolbar__input:focus,
.case-toolbar__select:focus,
.sidebar__link:focus,
.sidebar__sublink:focus,
.sidebar__logout:focus,
.app-shell__nav-toggle:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

.case-list {
    display: grid;
    gap: var(--space-md);
}

.case-list__loading,
.case-list__error,
.case-list__empty {
    border: 1px solid var(--color-border);
    background: var(--color-surface);
    padding: var(--space-lg);
}

.case-list__loading[hidden],
.case-list__error[hidden],
.case-list__empty[hidden],
.case-card[hidden] {
    display: none;
}

.case-list__error {
    border-left: 0.375rem solid var(--color-danger);
}

.case-card {
    display: grid;
    gap: var(--space-sm);
    border: 1px solid var(--color-border);
    border-left-width: 0.375rem;
    background: var(--color-surface);
    padding: var(--space-md);
}

.case-card--open {
    border-left-color: var(--color-status-open);
}

.case-card--parts {
    border-left-color: var(--color-status-parts);
}

.case-card--customer {
    border-left-color: var(--color-status-customer);
}

.case-card--closed {
    border-left-color: var(--color-status-closed);
}

.case-card__number {
    color: var(--color-primary);
    font-weight: 800;
}

.case-card__title {
    margin: 0;
    font-size: var(--font-size-lg);
    line-height: 1.25;
}

.case-card__excerpt,
.case-card__location {
    margin: var(--space-xs) 0 0;
    color: var(--color-muted);
    font-size: var(--font-size-sm);
}

.case-card__customer {
    display: grid;
    gap: var(--space-xs);
}

.case-card__date {
    color: var(--color-muted);
    font-size: var(--font-size-sm);
}

.customers__list {
    display: grid;
    gap: var(--space-md);
}

.customer-card,
.settings__list {
    border: 1px solid var(--color-border);
    background: var(--color-surface);
}

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

.customer-card__name {
    margin: 0;
    font-size: var(--font-size-lg);
}

.customer-card__meta,
.customer-card__contact,
.customer-card__phone {
    margin: var(--space-xs) 0 0;
    color: var(--color-muted);
}

.customer-card__link {
    display: inline-block;
    margin-top: var(--space-sm);
    color: var(--color-primary);
}

.settings__list {
    margin: 0;
}

.settings__row {
    display: grid;
    gap: var(--space-xs);
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-md);
}

.settings__row:last-child {
    border-bottom: 0;
}

.settings__label {
    color: var(--color-muted);
    font-weight: 700;
}

.settings__value {
    margin: 0;
    overflow-wrap: anywhere;
}

@media (min-width: 42rem) {
    .app-shell__main {
        padding-right: var(--space-lg);
        padding-left: var(--space-lg);
    }

    .status-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .case-toolbar {
        grid-template-columns: minmax(0, 1fr) 16rem;
        align-items: end;
    }

    .customers__list {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .settings__row {
        grid-template-columns: 14rem minmax(0, 1fr);
    }
}

@media (min-width: 64rem) {
    .app-shell {
        display: grid;
        grid-template-columns: var(--layout-sidebar-width) minmax(0, 1fr);
    }

    .app-shell__nav-toggle,
    .app-shell__overlay {
        display: none;
    }

    .app-shell__sidebar {
        position: sticky;
        top: 0;
        z-index: 1;
        width: var(--layout-sidebar-width);
        height: 100vh;
        transform: none;
    }

    .app-shell__main {
        max-width: none;
        margin: 0;
        padding: var(--space-xl);
    }

    .status-grid {
        grid-template-columns: repeat(4, minmax(0, 1fr));
    }

    .case-card {
        grid-template-columns: repeat(12, minmax(0, 1fr));
        align-items: center;
    }

    .case-card__number {
        grid-column: span 1;
    }

    .case-card__content {
        grid-column: span 6;
    }

    .case-card__customer {
        grid-column: span 3;
    }

    .case-card__date {
        grid-column: span 2;
        text-align: right;
    }
}