/* =============================================================================
   Grocery App - design system
   -----------------------------------------------------------------------------
   Every visual decision lives in this stylesheet: design tokens (colour, type,
   space, radius, elevation), the application shell and the component styles.
   Bootstrap 5.1 stays loaded underneath for the grid and the handful of
   utilities the markup relies on, but its components are restyled here rather
   than used as-is.

   Theming: an explicit theme is written to <html data-theme="light|dark"> by the inline
   script in index.html before first paint (stored preference, otherwise the OS setting),
   and changed at runtime by the theme control in the top bar. Both themes are driven by
   the same tokens, so nothing below hardcodes a colour.

   Sections
     1. Tokens (light + dark)
     2. Base and typography
     3. Application shell and page scaffolding
     4. Controls: buttons, forms, validation, chips
     5. Data display: tables, stats, alerts, states
     6. Motion, error UI and print
   ============================================================================= */

/* 1. Tokens ================================================================ */

:root {
    color-scheme: light;

    /* Surfaces */
    --canvas: #f4f5f7;
    --surface: #ffffff;
    --surface-muted: #f8f9fb;
    --surface-sunken: #eef0f4;
    --surface-inverse: #111827;

    /* Lines */
    --border: #e3e6eb;
    --border-strong: #ced4de;

    /* Text */
    --text: #101828;
    --text-muted: #4a5464;
    --text-subtle: #667085; /* AA compliant (4.97:1 on white) for small caps labels */
    --text-on-brand: #ffffff;

    /* Brand */
    --brand: #4338ca;
    --brand-hover: #3730a3;
    --brand-soft: #eef2ff;
    --brand-border: #c7d2fe;

    /* Status */
    --positive: #047857;
    --positive-soft: #ecfdf5;
    --positive-border: #a7f3d0;
    --caution: #b45309;
    --caution-soft: #fffbeb;
    --caution-border: #fde68a;
    --danger: #b91c1c;
    --danger-soft: #fef2f2;
    --danger-border: #fecaca;
    --info: #0369a1;
    --info-soft: #f0f9ff;
    --info-border: #bae6fd;

    /* Category accents */
    --cat-fruit: #0369a1;
    --cat-fruit-soft: #e0f2fe;
    --cat-vegetable: #047857;
    --cat-vegetable-soft: #ecfdf5;
    --cat-meat: #be123c;
    --cat-meat-soft: #fff1f2;
    --cat-cheese: #b45309;
    --cat-cheese-soft: #fffbeb;
    --cat-bread: #57534e;
    --cat-bread-soft: #f5f5f4;

    /* Radii */
    --radius-xs: 4px;
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-pill: 999px;

    /* Elevation */
    --shadow-xs: 0 1px 2px rgba(16, 24, 40, 0.06);
    --shadow-sm: 0 1px 3px rgba(16, 24, 40, 0.08), 0 1px 2px rgba(16, 24, 40, 0.04);
    --shadow-md: 0 4px 10px -2px rgba(16, 24, 40, 0.1), 0 2px 4px -2px rgba(16, 24, 40, 0.06);
    --shadow-lg: 0 16px 32px -12px rgba(16, 24, 40, 0.18);

    /* Focus */
    --focus-ring: 0 0 0 3px rgba(67, 56, 202, 0.28);
    --focus-ring-danger: 0 0 0 3px rgba(185, 28, 28, 0.25);

    /* Type */
    --font-sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
    --text-xs: 0.75rem;
    --text-sm: 0.8125rem;
    --text-base: 0.9375rem;
    --text-lg: 1.0625rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.625rem;
    --text-3xl: 2rem;

    /* Space */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;

    /* Shell */
    --sidebar-width: 264px;
    --topbar-height: 56px;
    --content-max: 1180px;
}

:root[data-theme="dark"] {
    color-scheme: dark;

    --canvas: #0b0f19;
    --surface: #131826;
    --surface-muted: #171d2b;
    --surface-sunken: #1d2434;
    --surface-inverse: #eef1f6;

    --border: #262f42;
    --border-strong: #384258;

    --text: #eef1f6;
    --text-muted: #a7b0c0;
    --text-subtle: #7c869a;
    --text-on-brand: #0b0f19;

    --brand: #a5b0ff;
    --brand-hover: #bcc4ff;
    --brand-soft: rgba(129, 140, 248, 0.14);
    --brand-border: rgba(129, 140, 248, 0.32);

    --positive: #34d399;
    --positive-soft: rgba(16, 185, 129, 0.13);
    --positive-border: rgba(16, 185, 129, 0.3);
    --caution: #fbbf24;
    --caution-soft: rgba(251, 191, 36, 0.12);
    --caution-border: rgba(251, 191, 36, 0.3);
    --danger: #f87171;
    --danger-soft: rgba(248, 113, 113, 0.12);
    --danger-border: rgba(248, 113, 113, 0.32);
    --info: #60a5fa;
    --info-soft: rgba(96, 165, 250, 0.12);
    --info-border: rgba(96, 165, 250, 0.32);

    --cat-fruit: #7dd3fc;
    --cat-fruit-soft: rgba(56, 189, 248, 0.14);
    --cat-vegetable: #6ee7b7;
    --cat-vegetable-soft: rgba(16, 185, 129, 0.14);
    --cat-meat: #fda4af;
    --cat-meat-soft: rgba(244, 63, 94, 0.14);
    --cat-cheese: #fcd34d;
    --cat-cheese-soft: rgba(245, 158, 11, 0.14);
    --cat-bread: #d6d3d1;
    --cat-bread-soft: rgba(214, 211, 209, 0.12);

    --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.4);
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.45);
    --shadow-md: 0 6px 14px -4px rgba(0, 0, 0, 0.55);
    --shadow-lg: 0 18px 36px -16px rgba(0, 0, 0, 0.7);

    --focus-ring: 0 0 0 3px rgba(165, 176, 255, 0.35);
    --focus-ring-danger: 0 0 0 3px rgba(248, 113, 113, 0.32);
}

/* 2. Base and typography =================================================== */

body {
    background-color: var(--canvas);
    color: var(--text);
    font-family: var(--font-sans);
    font-size: var(--text-base);
    line-height: 1.55;
    margin: 0;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5 {
    color: var(--text);
    font-weight: 600;
    letter-spacing: -0.015em;
    margin: 0;
}

h1 { font-size: var(--text-3xl); letter-spacing: -0.025em; }
h2 { font-size: var(--text-2xl); }
h3 { font-size: var(--text-xl); }
h4 { font-size: var(--text-lg); }
h5 { font-size: var(--text-base); }

p { margin: 0 0 var(--space-3); }

small { font-size: var(--text-sm); }

hr {
    border: 0;
    border-top: 1px solid var(--border);
    margin: var(--space-5) 0;
    opacity: 1;
}

a {
    color: var(--brand);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
    text-underline-offset: 2px;
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
    outline: 2px solid transparent;
    outline-offset: 2px;
    box-shadow: var(--focus-ring);
}

/* FocusOnNavigate (Routes.razor) moves focus to the page heading after every navigation so screen
   readers announce the new page. That heading is not interactive and is kept out of the tab order
   (tabindex="-1"), so its focus ring is suppressed - otherwise the browser paints a default outline
   around the title on first paint, which reads as a rendering bug. Keyboard focus indicators on
   real controls are unaffected (see the rule above). */
h1:focus,
h1:focus-visible {
    box-shadow: none;
    outline: none;
}

/* Bootstrap 5.1 paints its own blue focus ring on buttons, which outranks the global
   :focus-visible rule above. Keep one indicator across the app: the token ring for keyboard focus,
   and nothing on a mouse click. */
.btn:focus:not(:focus-visible) {
    box-shadow: none;
}

.btn:focus-visible {
    box-shadow: var(--focus-ring);
    outline: none;
}

::selection {
    background: var(--brand-soft);
    color: var(--text);
}

code, kbd, samp {
    color: var(--text);
    font-family: var(--font-mono);
    font-size: 0.85em;
}

/* Tabular figures keep numeric columns aligned in tables and stat tiles. */
.tnum { font-variant-numeric: tabular-nums; }

/* Semantic text helpers (avoid Bootstrap's !important colour utilities). */
.text-muted-strong { color: var(--text-muted); }
.text-subtle { color: var(--text-subtle); }
.text-positive { color: var(--positive); }
.text-caution { color: var(--caution); }
.text-negative { color: var(--danger); }
.text-brand { color: var(--brand); }

/* 3. Application shell and page scaffolding ================================= */

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

.app-sidebar {
    background-color: var(--surface);
    border-right: 1px solid var(--border);
    display: flex;
    flex: 0 0 var(--sidebar-width);
    flex-direction: column;
    height: 100vh;
    overflow-y: auto;
    position: sticky;
    top: 0;
    width: var(--sidebar-width);
}

.app-main {
    display: flex;
    flex: 1 1 auto;
    flex-direction: column;
    min-width: 0;
}

.app-topbar {
    align-items: center;
    background-color: var(--surface);
    border-bottom: 1px solid var(--border);
    display: flex;
    gap: var(--space-6);
    height: var(--topbar-height);
    justify-content: space-between;
    padding: 0 var(--space-6);
    position: sticky;
    top: 0;
    z-index: 5;
}

.app-topbar__note {
    color: var(--text-subtle);
    font-size: var(--text-sm);
    margin: 0;
}

.app-topbar__links {
    align-items: center;
    display: flex;
    gap: var(--space-5);
}

.app-topbar__actions {
    align-items: center;
    display: flex;
    gap: var(--space-4);
}

/* Theme control: a compact segmented control (light / dark / system). --------- */

.theme-toggle {
    align-items: center;
    background-color: var(--surface-sunken);
    border: 1px solid var(--border);
    border-radius: var(--radius-pill);
    display: inline-flex;
    flex: 0 0 auto;
    gap: 2px;
    padding: 2px;
}

.theme-toggle__button {
    align-items: center;
    background-color: transparent;
    border: 0;
    border-radius: var(--radius-pill);
    color: var(--text-muted);
    cursor: pointer;
    display: inline-flex;
    height: 26px;
    justify-content: center;
    transition: background-color 0.15s ease, color 0.15s ease, box-shadow 0.15s ease;
    width: 30px;
}

.theme-toggle__button:hover {
    color: var(--text);
}

.theme-toggle__button[aria-pressed="true"] {
    background-color: var(--surface);
    box-shadow: var(--shadow-xs);
    color: var(--text);
}

.topbar-link {
    align-items: center;
    color: var(--text-muted);
    display: inline-flex;
    font-size: var(--text-sm);
    font-weight: 500;
    gap: var(--space-2);
    white-space: nowrap;
}

.topbar-link:hover {
    color: var(--text);
    text-decoration: none;
}

.topbar-link .icon { color: var(--text-subtle); }

.topbar-link:hover .icon { color: var(--brand); }

.app-content {
    margin: 0 auto;
    max-width: var(--content-max);
    padding: var(--space-8) var(--space-6) var(--space-10);
    width: 100%;
}

.app-footer {
    border-top: 1px solid var(--border);
    color: var(--text-muted);
    font-size: var(--text-sm);
    margin-top: auto;
    padding: var(--space-5) var(--space-6) var(--space-6);
    text-align: center;
}

.app-footer p {
    margin: 0 auto;
    max-width: 78ch;
}

/* Icons (wwwroot/icons.svg) ------------------------------------------------- */

.icon {
    display: inline-block;
    flex: 0 0 auto;
    vertical-align: -0.14em;
}

.icon-sm { height: 14px; width: 14px; }

.icon-lg { height: 20px; width: 20px; }

/* Page scaffolding ---------------------------------------------------------- */

.page-header {
    align-items: flex-end;
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-4);
    justify-content: space-between;
    margin-bottom: var(--space-6);
}

.page-header__text { min-width: 0; }

.page-header h1 { margin-bottom: var(--space-1); }

.page-subtitle {
    color: var(--text-muted);
    margin: 0;
    max-width: 68ch;
}

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

.section-title {
    color: var(--text-subtle);
    font-size: var(--text-xs);
    font-weight: 600;
    letter-spacing: 0.08em;
    margin: var(--space-8) 0 var(--space-3);
    text-transform: uppercase;
}

.back-link {
    align-items: center;
    display: inline-flex;
    font-size: var(--text-sm);
    gap: var(--space-2);
    margin-bottom: var(--space-4);
}

/* Panels ------------------------------------------------------------------- */

.panel {
    background-color: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xs);
}

.panel__header {
    align-items: center;
    border-bottom: 1px solid var(--border);
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-3);
    justify-content: space-between;
    padding: var(--space-4) var(--space-5);
}

.panel__title {
    align-items: center;
    display: flex;
    font-size: var(--text-base);
    font-weight: 600;
    gap: var(--space-2);
    margin: 0;
}

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

.panel__body--flush { padding: 0; }

.panel__footer {
    background-color: var(--surface-muted);
    border-radius: 0 0 var(--radius-lg) var(--radius-lg);
    border-top: 1px solid var(--border);
    padding: var(--space-4) var(--space-5);
}

.panel--danger { border-color: var(--danger-border); }
.panel--danger .panel__header { background-color: var(--danger-soft); border-bottom-color: var(--danger-border); }

.panel-grid {
    display: grid;
    gap: var(--space-5);
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

/* Hero (Magic UI's dot-pattern rendered in plain CSS) ----------------------- */

.hero {
    background-color: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    padding: var(--space-10) var(--space-8);
    position: relative;
}

.hero::before {
    background-image: radial-gradient(currentColor 1px, transparent 1px);
    background-size: 16px 16px;
    color: var(--text-subtle);
    content: "";
    inset: 0;
    -webkit-mask-image: radial-gradient(ellipse 75% 65% at 50% 0%, #000 25%, transparent 100%);
    mask-image: radial-gradient(ellipse 75% 65% at 50% 0%, #000 25%, transparent 100%);
    opacity: 0.45;
    pointer-events: none;
    position: absolute;
}

.hero > * { position: relative; }

.hero h1 {
    font-size: clamp(1.75rem, 1.35rem + 1.7vw, 2.5rem);
    margin-bottom: var(--space-3);
    max-width: 30ch;
}

.hero__lead {
    color: var(--text-muted);
    font-size: var(--text-lg);
    margin-bottom: var(--space-6);
    max-width: 66ch;
}

.hero__actions {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-3);
}

.hero__meta {
    border-top: 1px solid var(--border);
    display: grid;
    gap: var(--space-6);
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    margin-top: var(--space-8);
    padding-top: var(--space-6);
}

.hero__meta-label {
    color: var(--text-subtle);
    display: block;
    font-size: var(--text-xs);
    font-weight: 600;
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

.hero__meta-value {
    font-size: var(--text-lg);
    font-weight: 600;
}

/* 4. Controls ============================================================== */

:root { --text-on-status: #ffffff; }

:root[data-theme="dark"] { --text-on-status: #10141c; }

/* Buttons ------------------------------------------------------------------ */

.btn {
    align-items: center;
    border: 1px solid transparent;
    border-radius: var(--radius-sm);
    display: inline-flex;
    font-family: inherit;
    font-size: var(--text-sm);
    font-weight: 500;
    gap: var(--space-2);
    justify-content: center;
    line-height: 1.2;
    min-height: 38px;
    padding: 0 var(--space-4);
    transition: background-color 0.15s ease, border-color 0.15s ease, color 0.15s ease, box-shadow 0.15s ease, transform 0.15s ease;
    white-space: nowrap;
}

.btn:active { transform: translateY(1px); }

.btn:disabled,
.btn.disabled {
    cursor: not-allowed;
    opacity: 0.55;
    pointer-events: none;
}

.btn-primary {
    background-color: var(--brand);
    border-color: var(--brand);
    box-shadow: var(--shadow-xs);
    color: var(--text-on-brand);
}

.btn-primary:hover {
    background-color: var(--brand-hover);
    border-color: var(--brand-hover);
    color: var(--text-on-brand);
    text-decoration: none;
}

.btn-positive,
.btn-success {
    background-color: var(--positive);
    border-color: var(--positive);
    color: var(--text-on-status);
}

.btn-positive:hover,
.btn-success:hover {
    color: var(--text-on-status);
    filter: brightness(1.08);
    text-decoration: none;
}

.btn-danger {
    background-color: var(--danger);
    border-color: var(--danger);
    color: var(--text-on-status);
}

.btn-danger:hover {
    color: var(--text-on-status);
    filter: brightness(1.08);
    text-decoration: none;
}

.btn-secondary {
    background-color: var(--surface);
    border-color: var(--border-strong);
    color: var(--text);
}

.btn-secondary:hover {
    background-color: var(--surface-muted);
    color: var(--text);
    text-decoration: none;
}

.btn-ghost {
    background-color: transparent;
    border-color: var(--border);
    color: var(--text-muted);
}

.btn-ghost:hover {
    background-color: var(--surface-muted);
    border-color: var(--border-strong);
    color: var(--text);
    text-decoration: none;
}

.btn-outline-primary {
    background-color: transparent;
    border-color: var(--brand-border);
    color: var(--brand);
}

.btn-outline-primary:hover {
    background-color: var(--brand-soft);
    color: var(--brand);
    text-decoration: none;
}

.btn-outline-danger {
    background-color: transparent;
    border-color: var(--danger-border);
    color: var(--danger);
}

.btn-outline-danger:hover {
    background-color: var(--danger-soft);
    color: var(--danger);
    text-decoration: none;
}

.btn-sm {
    font-size: var(--text-xs);
    min-height: 30px;
    padding: 0 var(--space-3);
}

.btn-lg {
    font-size: var(--text-base);
    min-height: 44px;
    padding: 0 var(--space-5);
}

/* Forms -------------------------------------------------------------------- */

.form-label {
    color: var(--text);
    display: block;
    font-size: var(--text-sm);
    font-weight: 500;
    margin-bottom: var(--space-2);
}

.form-control {
    background-color: var(--surface);
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-sm);
    color: var(--text);
    display: block;
    font-family: inherit;
    font-size: var(--text-base);
    min-height: 38px;
    padding: 0.375rem 0.625rem;
    transition: border-color 0.15s ease, box-shadow 0.15s ease, background-color 0.15s ease;
    width: 100%;
}

.form-control:focus {
    background-color: var(--surface);
    border-color: var(--brand);
    box-shadow: var(--focus-ring);
    color: var(--text);
    outline: none;
}

.form-control::placeholder { color: var(--text-subtle); }

.form-control:disabled,
.form-control[readonly] {
    background-color: var(--surface-muted);
    opacity: 0.85;
}

select.form-control {
    -webkit-appearance: none;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='%236b7280'%3E%3Cpath d='M8 11.5 3.5 7h9z'/%3E%3C/svg%3E");
    background-position: right 0.6rem center;
    background-repeat: no-repeat;
    background-size: 12px;
    padding-right: 2rem;
}

:root[data-theme="dark"] select.form-control {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='%23a7b0c0'%3E%3Cpath d='M8 11.5 3.5 7h9z'/%3E%3C/svg%3E");
}

.form-grid {
    display: grid;
    gap: var(--space-5);
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.form-actions {
    border-top: 1px solid var(--border);
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-3);
    margin-top: var(--space-6);
    padding-top: var(--space-5);
}

.form-hint {
    color: var(--text-subtle);
    font-size: var(--text-sm);
    margin-top: var(--space-1);
}

/* Validation --------------------------------------------------------------- */

.validation-message {
    color: var(--danger);
    display: block;
    font-size: var(--text-sm);
    margin-top: var(--space-1);
}

.validation-errors {
    background-color: var(--danger-soft);
    border: 1px solid var(--danger-border);
    border-radius: var(--radius-sm);
    color: var(--danger);
    list-style: none;
    margin: 0 0 var(--space-5);
    padding: var(--space-3) var(--space-4);
}

.validation-errors li { font-size: var(--text-sm); }

.invalid,
input.invalid,
select.invalid,
.form-control.invalid { border-color: var(--danger); }

.invalid:focus { box-shadow: var(--focus-ring-danger); }

.valid.modified:not([type=checkbox]) { border-color: var(--positive); }

/* Chips -------------------------------------------------------------------- */

.chip {
    align-items: center;
    border-radius: var(--radius-pill);
    display: inline-flex;
    font-size: var(--text-xs);
    font-weight: 600;
    gap: var(--space-1);
    letter-spacing: 0.01em;
    line-height: 1.7;
    padding: 0.05rem 0.55rem;
    white-space: nowrap;
}

.chip--fruit { background-color: var(--cat-fruit-soft); color: var(--cat-fruit); }
.chip--vegetable { background-color: var(--cat-vegetable-soft); color: var(--cat-vegetable); }
.chip--meat { background-color: var(--cat-meat-soft); color: var(--cat-meat); }
.chip--cheese { background-color: var(--cat-cheese-soft); color: var(--cat-cheese); }
.chip--bread { background-color: var(--cat-bread-soft); color: var(--cat-bread); }
.chip--neutral { background-color: var(--surface-sunken); color: var(--text-muted); }
.chip--brand { background-color: var(--brand-soft); color: var(--brand); }
.chip--positive { background-color: var(--positive-soft); color: var(--positive); }
.chip--caution { background-color: var(--caution-soft); color: var(--caution); }
.chip--danger { background-color: var(--danger-soft); color: var(--danger); }

/* Stock stepper ------------------------------------------------------------ */

.stepper {
    align-items: stretch;
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-sm);
    display: inline-flex;
    overflow: hidden;
}

.stepper__button {
    align-items: center;
    background-color: var(--surface);
    border: 0;
    color: var(--text-muted);
    cursor: pointer;
    display: inline-flex;
    font-size: var(--text-base);
    font-weight: 600;
    height: 32px;
    justify-content: center;
    line-height: 1;
    width: 32px;
}

.stepper__button:hover:not(:disabled) {
    background-color: var(--surface-muted);
    color: var(--text);
}

.stepper__button:disabled {
    color: var(--text-subtle);
    cursor: not-allowed;
    opacity: 0.6;
}

.stepper__value {
    border-left: 1px solid var(--border);
    border-right: 1px solid var(--border);
    font-variant-numeric: tabular-nums;
    font-weight: 600;
    min-width: 44px;
    padding: 0 var(--space-2);
    text-align: center;
}

/* 5. Data display ========================================================== */

/* Tables ------------------------------------------------------------------- */

.table {
    border-collapse: separate;
    border-spacing: 0;
    color: var(--text);
    margin: 0;
    width: 100%;
}

.table > thead > tr > th {
    border-bottom: 1px solid var(--border);
    color: var(--text-subtle);
    font-size: var(--text-xs);
    font-weight: 600;
    letter-spacing: 0.06em;
    padding: var(--space-3) var(--space-4);
    text-align: left;
    text-transform: uppercase;
    vertical-align: bottom;
    white-space: nowrap;
}

.table > tbody > tr > td {
    border-bottom: 1px solid var(--border);
    padding: var(--space-3) var(--space-4);
    vertical-align: middle;
}

.table > tbody > tr:last-child > td { border-bottom: 0; }

.table > tbody > tr:hover > td { background-color: var(--surface-muted); }

.table .num,
.table th.num,
.table td.num {
    font-variant-numeric: tabular-nums;
    text-align: right;
}

.table-responsive {
    -webkit-overflow-scrolling: touch;
    overflow-x: auto;
}

/* Sortable columns: sortable-table.js toggles .sort-asc / .sort-desc. -------- */

.sortable-table th.sortable {
    cursor: pointer;
    padding-right: calc(var(--space-4) + 14px);
    position: relative;
    user-select: none;
}

.sortable-table th.sortable:hover { color: var(--text); }

.sortable-table th.sortable::after {
    border-bottom: 5px solid var(--border-strong);
    border-left: 4px solid transparent;
    border-right: 4px solid transparent;
    content: "";
    opacity: 0.45;
    position: absolute;
    right: var(--space-4);
    top: 50%;
    transform: translateY(-50%);
}

.sortable-table th.sort-asc::after {
    border-bottom-color: var(--brand);
    opacity: 1;
}

.sortable-table th.sort-desc::after {
    border-bottom-color: var(--brand);
    opacity: 1;
    transform: translateY(-50%) rotate(180deg);
}

/* Stat tiles --------------------------------------------------------------- */

.stat-grid {
    display: grid;
    gap: var(--space-4);
    grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
}

.stat-tile {
    background-color: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xs);
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
    padding: var(--space-4) var(--space-5);
}

.stat-tile--brand {
    background-image: linear-gradient(180deg, var(--brand-soft), transparent 65%);
    border-color: var(--brand-border);
}

.stat-tile__label {
    align-items: center;
    color: var(--text-subtle);
    display: flex;
    font-size: var(--text-xs);
    font-weight: 600;
    gap: var(--space-2);
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

.stat-tile__value {
    font-size: var(--text-2xl);
    font-variant-numeric: tabular-nums;
    font-weight: 600;
    letter-spacing: -0.02em;
}

.stat-tile__meta {
    color: var(--text-subtle);
    font-size: var(--text-sm);
}

/* Catalogue items ---------------------------------------------------------- */

.category-grid {
    display: grid;
    gap: var(--space-5);
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
}

.item-list { display: flex; flex-direction: column; }

.item-row {
    border-bottom: 1px solid var(--border);
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-4);
    justify-content: space-between;
    padding: var(--space-4) var(--space-5);
}

.item-row:last-child { border-bottom: 0; }

.item-row:hover { background-color: var(--surface-muted); }

.item-row__main { min-width: 0; }

.item-row__head {
    align-items: center;
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
}

.item-row__name { font-weight: 600; }

.item-row__id {
    color: var(--text-subtle);
    font-size: var(--text-xs);
    font-variant-numeric: tabular-nums;
}

.item-row__figures {
    color: var(--text-muted);
    display: flex;
    flex-wrap: wrap;
    font-size: var(--text-sm);
    gap: var(--space-4);
    margin-top: var(--space-2);
}

.item-row__figure-value {
    color: var(--text);
    font-variant-numeric: tabular-nums;
    font-weight: 500;
}

.item-row__aside {
    align-items: flex-end;
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.item-row__stock {
    align-items: center;
    display: flex;
    gap: var(--space-3);
}

.item-row__label {
    color: var(--text-subtle);
    font-size: var(--text-xs);
    font-weight: 600;
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

.row-actions {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
}

/* Definition lists --------------------------------------------------------- */

.detail-grid { display: grid; }

.detail-row {
    border-bottom: 1px solid var(--border);
    display: grid;
    gap: var(--space-2) var(--space-5);
    grid-template-columns: minmax(150px, 220px) 1fr;
    padding: var(--space-3) 0;
}

.detail-row:last-child { border-bottom: 0; }

.detail-row dt {
    color: var(--text-muted);
    font-size: var(--text-sm);
    font-weight: 500;
    margin: 0;
}

.detail-row dd { margin: 0; }

@media (max-width: 575.98px) {
    .detail-row { grid-template-columns: 1fr; }
}

/* Alerts and notices ------------------------------------------------------- */

.alert {
    background-color: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    color: var(--text);
    margin-bottom: var(--space-4);
    padding: var(--space-4) var(--space-5);
}

.alert--info, .alert-info { background-color: var(--info-soft); border-color: var(--info-border); }
.alert--positive, .alert-success { background-color: var(--positive-soft); border-color: var(--positive-border); }
.alert--caution, .alert-warning { background-color: var(--caution-soft); border-color: var(--caution-border); }
.alert--danger, .alert-danger { background-color: var(--danger-soft); border-color: var(--danger-border); }

.alert__title {
    align-items: center;
    display: flex;
    font-size: var(--text-base);
    font-weight: 600;
    gap: var(--space-2);
    margin: 0 0 var(--space-2);
}

.alert--info .alert__title, .alert-info .alert__title { color: var(--info); }
.alert--positive .alert__title, .alert-success .alert__title { color: var(--positive); }
.alert--caution .alert__title, .alert-warning .alert__title { color: var(--caution); }
.alert--danger .alert__title, .alert-danger .alert__title { color: var(--danger); }

.alert > :last-child { margin-bottom: 0; }

/* Empty and loading states -------------------------------------------------- */

.empty-state {
    color: var(--text-muted);
    padding: var(--space-10) var(--space-6);
    text-align: center;
}

.empty-state__icon {
    color: var(--text-subtle);
    display: block;
    margin-bottom: var(--space-3);
}

.empty-state h2, .empty-state h3 {
    font-size: var(--text-lg);
    margin-bottom: var(--space-2);
}

.empty-state p {
    margin: 0 auto var(--space-2);
    max-width: 48ch;
}

.empty-state__actions {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-3);
    justify-content: center;
    margin-top: var(--space-4);
}

.loading-state {
    align-items: center;
    color: var(--text-muted);
    display: flex;
    gap: var(--space-3);
    padding: var(--space-8) 0;
}

/* Blazor error UI. The markup lives in index.html (the only copy in the app), because it has to
   exist before Blazor boots to be able to report a start-up failure. */

#blazor-error-ui {
    background-color: var(--danger-soft);
    border-top: 1px solid var(--danger-border);
    bottom: 0;
    box-shadow: var(--shadow-md);
    color: var(--text);
    display: none;
    left: 0;
    /* The framework shows this element with display:block and attaches the dismiss handler itself,
       so the layout is block based and the close control is positioned rather than flexed. */
    padding: var(--space-3) calc(var(--space-6) + 36px) var(--space-3) var(--space-6);
    position: fixed;
    width: 100%;
    z-index: 1000;
}

#blazor-error-ui .reload {
    color: var(--brand);
    font-weight: 500;
    margin-left: var(--space-2);
}

#blazor-error-ui .dismiss {
    align-items: center;
    background-color: transparent;
    border: 1px solid transparent;
    border-radius: var(--radius-sm);
    color: var(--text-muted);
    cursor: pointer;
    display: inline-flex;
    height: 28px;
    justify-content: center;
    position: absolute;
    right: var(--space-4);
    top: 50%;
    transform: translateY(-50%);
    width: 28px;
}

#blazor-error-ui .dismiss:hover {
    background-color: var(--surface);
    border-color: var(--danger-border);
    color: var(--text);
}

/* Bootstrap compatibility --------------------------------------------------- */
/* Some Bootstrap utilities and components are used by existing markup and a few
   of them set !important, so they are remapped onto the tokens here. */

.text-muted { color: var(--text-muted) !important; }
.text-danger { color: var(--danger) !important; }
.text-success { color: var(--positive) !important; }
.text-white { color: var(--text-on-brand) !important; }
.bg-primary { background-color: var(--brand) !important; }
.bg-info { background-color: var(--info-soft) !important; }
.bg-success { background-color: var(--positive-soft) !important; }
.bg-warning { background-color: var(--caution-soft) !important; }
.bg-danger { background-color: var(--danger-soft) !important; }

.list-unstyled {
    list-style: none;
    padding-left: 0;
}

.card {
    background-color: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xs);
}

.card-header {
    background-color: transparent;
    border-bottom: 1px solid var(--border);
    padding: var(--space-4) var(--space-5);
}

.card-header h3, .card-header h5 {
    font-size: var(--text-base);
    font-weight: 600;
    margin: 0;
}

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

.card-title {
    font-size: var(--text-base);
    font-weight: 600;
    margin-bottom: var(--space-2);
}

.card-text { color: var(--text-muted); }

.badge {
    border-radius: var(--radius-pill);
    font-size: var(--text-xs);
    font-weight: 600;
    line-height: 1.7;
    padding: 0.05rem 0.55rem;
}

.table-sm > thead > tr > th,
.table-sm > tbody > tr > td {
    padding: var(--space-2) var(--space-3);
}

.table-success { --bs-table-bg: var(--positive-soft); --bs-table-color: var(--text); }
.table-warning { --bs-table-bg: var(--caution-soft); --bs-table-color: var(--text); }
.table-danger { --bs-table-bg: var(--danger-soft); --bs-table-color: var(--text); }

/* 6. Motion and print ====================================================== */

/* Page entrance using Magic UI's blur-fade defaults (0.4s, 0.04s delay,
   6px offset, 6px blur). One tasteful transition on navigation, nothing else. */
@media (prefers-reduced-motion: no-preference) {
    .app-content > * {
        animation: blur-fade-in 0.4s cubic-bezier(0, 0, 0.2, 1) 0.04s both;
    }
}

@keyframes blur-fade-in {
    from {
        filter: blur(6px);
        opacity: 0;
        transform: translateY(-6px);
    }

    to {
        filter: none;
        opacity: 1;
        transform: none;
    }
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.001ms !important;
        animation-iteration-count: 1 !important;
        scroll-behavior: auto !important;
        transition-duration: 0.001ms !important;
    }
}

@media print {
    .app-sidebar,
    .app-topbar,
    .app-footer,
    .page-actions,
    .row-actions {
        display: none !important;
    }

    .app-content {
        max-width: none;
        padding: 0;
    }

    .panel, .stat-tile, .table, .card {
        box-shadow: none;
    }
}

/* 7. Navigation and responsive shell ====================================== */

.nav-head {
    padding: var(--space-5) var(--space-5) var(--space-4);
}

/* Header row: the link back to pattygcoding.com sits first (leftmost control in the app),
   followed by the brand. Mirrors the sidebar header used by Neo-Connect-Four. */
.nav-head__row {
    align-items: center;
    display: flex;
    gap: var(--space-3);
}

/* Square icon-only control. */
.icon-button {
    align-items: center;
    background-color: var(--surface-sunken);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-muted);
    display: inline-flex;
    flex: 0 0 auto;
    height: 34px;
    justify-content: center;
    transition: background-color 0.15s ease, border-color 0.15s ease, color 0.15s ease;
    width: 34px;
}

.icon-button:hover {
    background-color: var(--surface);
    border-color: var(--brand-border);
    color: var(--brand);
    text-decoration: none;
}

.icon-button:focus-visible {
    box-shadow: var(--focus-ring);
}

.nav-brand {
    align-items: center;
    display: flex;
    gap: var(--space-3);
    min-width: 0;
}

.nav-brand:hover { text-decoration: none; }

.nav-brand__mark {
    align-items: center;
    background-color: var(--brand);
    border-radius: var(--radius-md);
    color: var(--text-on-brand);
    display: inline-flex;
    height: 34px;
    justify-content: center;
    width: 34px;
}

.nav-brand__text {
    display: flex;
    flex-direction: column;
    line-height: 1.25;
    min-width: 0;
}

.nav-brand__name {
    color: var(--text);
    font-size: var(--text-base);
    font-weight: 600;
}

.nav-brand__meta {
    color: var(--text-subtle);
    font-size: var(--text-xs);
}

/* The menu control is a visually hidden checkbox, so collapsing the navigation
   on small screens needs no JavaScript. */

.nav-toggle {
    height: 1px;
    opacity: 0;
    position: absolute;
    width: 1px;
}

.nav-toggle-button {
    align-items: center;
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-sm);
    cursor: pointer;
    display: none;
    height: 34px;
    justify-content: center;
    position: absolute;
    right: var(--space-4);
    top: var(--space-4);
    width: 34px;
}

.nav-toggle-bars {
    background-color: var(--text-muted);
    box-shadow: 0 5px 0 0 var(--text-muted), 0 -5px 0 0 var(--text-muted);
    display: block;
    height: 1.5px;
    width: 15px;
}

.nav-toggle:focus-visible + .nav-toggle-button {
    box-shadow: var(--focus-ring);
}

.nav-list {
    display: flex;
    flex-direction: column;
    gap: 2px;
    padding: 0 var(--space-3) var(--space-5);
}

.nav-section {
    color: var(--text-subtle);
    font-size: var(--text-xs);
    font-weight: 600;
    letter-spacing: 0.08em;
    margin-top: var(--space-4);
    padding: 0 var(--space-2) var(--space-1);
    text-transform: uppercase;
}

.nav-link {
    align-items: center;
    border-radius: var(--radius-sm);
    color: var(--text-muted);
    display: flex;
    font-size: var(--text-base);
    font-weight: 500;
    gap: var(--space-3);
    padding: var(--space-2) var(--space-3);
}

.nav-link:hover {
    background-color: var(--surface-muted);
    color: var(--text);
    text-decoration: none;
}

.nav-link.active {
    background-color: var(--brand-soft);
    color: var(--brand);
    font-weight: 600;
}

.nav-link .icon { color: var(--text-subtle); }

.nav-link.active .icon { color: var(--brand); }

.nav-link__hint {
    margin-left: auto;
    opacity: 0.5;
}

@media (max-width: 991.98px) {
    .app-shell { flex-direction: column; }

    .app-sidebar {
        border-bottom: 1px solid var(--border);
        border-right: 0;
        flex: 0 0 auto;
        height: auto;
        position: sticky;
        top: 0;
        width: 100%;
        z-index: 10;
    }

    .app-topbar { position: static; }

    .app-topbar__note { display: none; }

    /* The same links live in the navigation menu, so the top bar keeps only the theme control. */
    .app-topbar__links { display: none; }

    .nav-toggle-button { display: inline-flex; }

    .nav-list {
        border-top: 1px solid var(--border);
        display: none;
        margin-top: var(--space-4);
        padding-top: var(--space-2);
    }

    .nav-toggle:checked ~ .nav-list { display: flex; }
}

/* 8. Home page composition ================================================ */

.split {
    display: grid;
    gap: var(--space-5);
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
}

.feature__icon {
    align-items: center;
    background-color: var(--brand-soft);
    border-radius: var(--radius-md);
    color: var(--brand);
    display: inline-flex;
    height: 36px;
    justify-content: center;
    margin-bottom: var(--space-3);
    width: 36px;
}

.feature__title {
    font-size: var(--text-base);
    font-weight: 600;
    margin-bottom: var(--space-1);
}

.feature__text {
    color: var(--text-muted);
    font-size: var(--text-sm);
    margin: 0;
}

.list-check {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    list-style: none;
    margin: 0;
    padding: 0;
}

.list-check li {
    align-items: flex-start;
    color: var(--text-muted);
    display: flex;
    font-size: var(--text-sm);
    gap: var(--space-3);
}

.list-check .icon {
    color: var(--positive);
    margin-top: 3px;
}

.tag-cloud {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
}

.flow {
    align-items: center;
    color: var(--text-muted);
    display: flex;
    flex-wrap: wrap;
    font-family: var(--font-mono);
    font-size: var(--text-sm);
    gap: var(--space-2);
    word-break: break-word;
}

.flow__arrow {
    color: var(--text-subtle);
    vertical-align: 0;
}

.flow code {
    background-color: var(--surface-sunken);
    border-radius: var(--radius-xs);
    color: var(--text);
    padding: 0.1rem 0.35rem;
}

/* 9. Narrow form and confirmation panels ================================== */

.panel--narrow { max-width: 620px; }