/* ============================================================
   Elioplus Design System - startup loader (app shell)
   ============================================================

   What an app shows while Blazor WebAssembly downloads and boots: a light skeleton of
   the app's own frame (brand bar, page title, cards) so the page looks like it is
   already opening, a real progress line under the bar, and a small status pill. It
   replaces the old full-screen dark folding-cube loader, which read as a crash next
   to the white public site.

   The host page carries only the container (it has to paint before any script runs):

       <div id="global-loader" class="ds-loader" data-shell="topnav" ...>
           <div class="ds-loader-progress" role="progressbar" ...></div>
           <p class="ds-loader-status" role="status">...</p>
       </div>

   js/elioplus-loader.js builds the decorative skeleton for the data-shell named
   (topnav | rail | checkout), and the "taking longer than usual" and "couldn't load"
   cards; see the header of that file for every data-* option. The app hides it with
   hideGlobalLoader().

   The progress is Blazor's own: the WebAssembly boot script sets
   --blazor-load-percentage on <html> as resources arrive. The line shows 90% of it,
   so the last stretch (runtime start, sign-in) still has room to move, and fills to
   100% when the app calls hideGlobalLoader().

   --ds-loader-* are this component's own values, each with a fallback to a semantic
   token, so an application overrides only what it needs (on :root in its brand file).
   Link after tokens.css.
   ============================================================ */

.ds-loader {
    position: fixed;
    inset: 0;
    z-index: 9999;
    overflow: hidden;
    background: var(--ds-loader-bg, var(--ds-surface-alt));
    color: var(--ds-text-body);
    font-family: var(--ds-font-family);
    opacity: 1;
    transition: opacity 0.2s ease-out;
}

.ds-loader[hidden] {
    display: none;
}

/* data-dense: the app's MudAppBar is Dense (48px). */
.ds-loader[data-dense] {
    --ds-loader-bar-height: 48px;
}

.ds-loader.is-leaving {
    opacity: 0;
    pointer-events: none;
}

/* A load that finishes within ~300ms never shows the skeleton: only the background
   paints, and the frame fades in after the delay. */
.ds-loader-shell,
.ds-loader-progress,
.ds-loader-status {
    animation: ds-loader-in 0.25s ease-out 0.3s both;
}

@keyframes ds-loader-in {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* --- Skeleton blocks ---------------------------------------------------------
   One shimmer sweeps the whole page: the gradient is fixed to the viewport, so every
   block shows its own slice of the same moving highlight. */
.ds-sk {
    display: block;
    height: 12px;
    border-radius: var(--ds-radius-md);
    background-color: var(--ds-loader-sk, var(--ds-surface-sunken));
    background-image: linear-gradient(100deg,
        transparent 40%,
        var(--ds-loader-sk-shine, var(--ds-white-a75)) 50%,
        transparent 60%);
    background-size: 200vw 100%;
    background-attachment: fixed;
    background-repeat: no-repeat;
    animation: ds-loader-shimmer 1.6s linear infinite;
}

@keyframes ds-loader-shimmer {
    from { background-position: -120vw 0; }
    to { background-position: 20vw 0; }
}

.ds-sk--title { height: 26px; width: min(280px, 70%); }
.ds-sk--sub { height: 14px; width: min(420px, 90%); }
.ds-sk--label { height: 12px; width: 45%; }
.ds-sk--value { height: 28px; width: 55%; }
.ds-sk--meta { height: 10px; width: 75%; }
.ds-sk--heading { height: 16px; width: min(200px, 60%); }
.ds-sk--line { height: 12px; width: 50%; }
.ds-sk--line-short { height: 10px; width: 30%; }
.ds-sk--icon { flex: none; width: 36px; height: 36px; border-radius: var(--ds-radius-lg); }
.ds-sk--chip { flex: none; width: 72px; height: 24px; border-radius: var(--ds-radius-pill); }
.ds-sk--avatar { flex: none; width: 36px; height: 36px; border-radius: var(--ds-radius-pill); }
.ds-sk--pill { flex: none; width: 96px; height: 32px; border-radius: var(--ds-radius-pill); }
.ds-sk--tab { flex: none; width: 96px; height: 14px; }
.ds-sk--tab:nth-child(2n) { width: 136px; }
.ds-sk--rail { width: 24px; height: 24px; border-radius: var(--ds-radius-sm); }
.ds-sk--chart { height: 150px; border-radius: var(--ds-radius-lg); }
.ds-sk--field { height: 44px; }
.ds-sk--button { height: 48px; border-radius: var(--ds-radius-md); }

/* Blocks on the brand bar read as a lighter tint of it. */
.ds-loader-bar .ds-sk {
    background-color: var(--ds-loader-bar-sk, var(--ds-white-a12));
    background-image: linear-gradient(100deg,
        transparent 40%,
        var(--ds-loader-bar-sk-shine, var(--ds-white-a12)) 50%,
        transparent 60%);
}

/* --- The frame ----------------------------------------------------------------
   Three shells, chosen with data-shell on the container. They follow each app's
   real chrome so the change to the live page is barely noticeable. */
.ds-loader-shell {
    display: flex;
    flex-direction: column;
    height: 100%;
}

.ds-loader-bar {
    flex: none;
    display: flex;
    align-items: center;
    gap: 32px;
    height: var(--ds-loader-bar-height, 64px);
    padding: 0 24px;
    background: var(--ds-loader-bar-bg, var(--ds-primary));
    color: var(--ds-loader-bar-text, var(--ds-text-inverse));
}

.ds-loader-bar-tabs,
.ds-loader-bar-end {
    display: flex;
    align-items: center;
    gap: 16px;
}

.ds-loader-bar-end {
    margin-left: auto;
}

.ds-loader-logo {
    flex: none;
    display: block;
    height: var(--ds-loader-logo-height, 36px);
    width: auto;
}

.ds-loader-title {
    margin: 0;
    font-size: var(--ds-text-20);
    font-weight: var(--ds-weight-bold);
    line-height: var(--ds-leading-tight);
    white-space: nowrap;
}

.ds-loader-menu {
    flex: none;
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 4px;
    width: 24px;
    height: 24px;
}

.ds-loader-menu .ds-sk {
    height: 2px;
    border-radius: var(--ds-radius-pill);
    background: currentColor;
    animation: none;
}

.ds-loader-body {
    flex: 1;
    display: flex;
    min-height: 0;
}

.ds-loader-rail {
    flex: none;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 24px;
    width: 56px;
    padding-top: 20px;
    background: var(--ds-surface);
    border-right: 1px solid var(--ds-border);
}

.ds-loader-page {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    gap: 24px;
    width: 100%;
    max-width: var(--ds-loader-page-max, 1920px);
    margin: 0 auto;
    padding: 24px;
    box-sizing: border-box;
}

.ds-loader-heading {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.ds-loader-grid {
    display: grid;
    gap: 20px;
}

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

.ds-loader-grid--main {
    grid-template-columns: minmax(0, 2fr) minmax(0, 1fr);
    align-items: start;
}

.ds-loader-card {
    display: flex;
    flex-direction: column;
    gap: 14px;
    padding: 20px;
    background: var(--ds-surface);
    border: 1px solid var(--ds-border);
    border-radius: var(--ds-radius-lg);
}

.ds-loader-row {
    display: flex;
    align-items: center;
    gap: 14px;
}

.ds-loader-row-text {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

/* rail: the admin dashboards - a dense brand bar with a menu button and the app's
   name, and a mini drawer of icons down the left from MudBlazor's md breakpoint. */
.ds-loader[data-shell="rail"] .ds-loader-bar {
    gap: 16px;
    padding: 0 16px;
}

.ds-loader[data-shell="rail"] .ds-loader-page {
    padding: 16px;
}

/* checkout: a 56px brand bar with the logo, over a form and an order summary on white. */
.ds-loader[data-shell="checkout"] {
    --ds-loader-bar-height: 56px;
    background: var(--ds-loader-bg, var(--ds-surface));
}

.ds-loader[data-shell="checkout"] .ds-loader-page {
    max-width: var(--ds-loader-page-max, 1280px);
    padding-top: 32px;
}

.ds-loader-grid--checkout {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 48px;
    align-items: start;
}

/* --- Progress -------------------------------------------------------------- */
.ds-loader-progress {
    position: absolute;
    left: 0;
    top: var(--ds-loader-bar-height, 64px);
    z-index: 1;
    height: 3px;
    width: max(3%, calc(var(--blazor-load-percentage, 0%) * 0.9));
    border-radius: 0 var(--ds-radius-pill) var(--ds-radius-pill) 0;
    background: var(--ds-loader-progress, var(--ds-primary));
    transition: width 0.2s ease-out;
}

.ds-loader.is-done .ds-loader-progress {
    width: 100%;
}

/* showGlobalLoader(): a page that is leaving shows no skeleton, only a moving
   line at the very top and the status pill. */
.ds-loader.is-plain .ds-loader-shell {
    display: none;
}

.ds-loader.is-plain .ds-loader-progress {
    top: 0;
    width: 30%;
    animation: ds-loader-indeterminate 1.4s ease-in-out infinite;
}

.ds-loader.is-plain .ds-loader-status {
    animation: none;
}

@keyframes ds-loader-indeterminate {
    from { transform: translateX(-100%); }
    to { transform: translateX(340%); }
}

/* --- Status pill ----------------------------------------------------------- */
.ds-loader-status {
    position: absolute;
    left: 50%;
    bottom: 28px;
    transform: translateX(-50%);
    display: flex;
    align-items: center;
    gap: 10px;
    margin: 0;
    padding: 9px 16px;
    max-width: calc(100% - 32px);
    box-sizing: border-box;
    background: var(--ds-surface);
    border: 1px solid var(--ds-border);
    border-radius: var(--ds-radius-pill);
    box-shadow: var(--ds-shadow-md);
    font-size: var(--ds-text-13);
    line-height: var(--ds-leading-tight);
    color: var(--ds-text-secondary);
    white-space: nowrap;
}

.ds-loader-dot {
    flex: none;
    width: 8px;
    height: 8px;
    border-radius: var(--ds-radius-pill);
    background: var(--ds-loader-progress, var(--ds-primary));
    animation: ds-loader-pulse 1.4s ease-in-out infinite;
}

@keyframes ds-loader-pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.35; }
}

.ds-loader-label {
    overflow: hidden;
    text-overflow: ellipsis;
}

.ds-loader-pct {
    font-weight: var(--ds-weight-semibold);
    color: var(--ds-text-primary);
    font-variant-numeric: tabular-nums;
}

.ds-loader-pct:empty {
    display: none;
}

/* --- Slow and failed notices ----------------------------------------------- */
.ds-loader-notice {
    position: absolute;
    left: 50%;
    bottom: 28px;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    gap: 16px;
    width: min(420px, calc(100% - 32px));
    box-sizing: border-box;
    padding: 20px;
    background: var(--ds-surface);
    border: 1px solid var(--ds-border);
    border-radius: var(--ds-radius-xl);
    box-shadow: var(--ds-shadow-lg);
    animation: ds-loader-in 0.2s ease-out both;
}

.ds-loader-notice[hidden] {
    display: none;
}

.ds-loader.has-notice .ds-loader-status {
    display: none;
}

.ds-loader-notice-title {
    margin: 0 0 4px;
    font-size: var(--ds-text-15);
    font-weight: var(--ds-weight-semibold);
    line-height: var(--ds-leading-tight);
    color: var(--ds-text-primary);
}

.ds-loader-notice-text {
    margin: 0;
    font-size: var(--ds-text-14);
    line-height: var(--ds-leading-body);
    color: var(--ds-text-secondary);
}

.ds-loader-actions {
    display: flex;
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: 10px;
}

/* The failed state: the skeleton stops, and the card sits in the middle of a
   dimmed page with the app's own "Reload" and "Contact support". */
.ds-loader.is-failed .ds-sk,
.ds-loader.is-failed .ds-loader-dot {
    animation: none;
}

.ds-loader.is-failed .ds-loader-progress {
    display: none;
}

.ds-loader.is-failed .ds-loader-shell {
    animation: none;
    opacity: 0.5;
}

.ds-loader-notice--failed {
    top: 50%;
    bottom: auto;
    transform: translate(-50%, -50%);
    padding: 28px;
}

.ds-loader-notice--failed .ds-loader-notice-title {
    font-size: var(--ds-text-18);
    font-weight: var(--ds-weight-bold);
}

.ds-loader-notice--failed .ds-loader-actions {
    justify-content: flex-start;
}

.ds-loader-alert-icon {
    display: block;
    width: 40px;
    height: 40px;
}

.ds-loader-alert-icon circle {
    fill: var(--ds-error-surface);
}

.ds-loader-alert-icon path {
    fill: none;
    stroke: var(--ds-error);
    stroke-width: 2.2;
    stroke-linecap: round;
}

/* Buttons: the loader paints before MudBlazor exists, so it carries its own two. */
.ds-loader-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 44px;
    padding: 0 18px;
    border: 1px solid var(--ds-border-emphasis);
    border-radius: var(--ds-radius-md);
    background: var(--ds-surface);
    color: var(--ds-text-primary);
    font: inherit;
    font-size: var(--ds-text-14);
    font-weight: var(--ds-weight-semibold);
    text-decoration: none;
    cursor: pointer;
}

.ds-loader-btn:hover {
    border-color: var(--ds-border-hover);
    background: var(--ds-surface-alt);
}

.ds-loader-btn--primary {
    border-color: var(--ds-primary);
    background: var(--ds-primary);
    color: var(--ds-text-inverse);
}

.ds-loader-btn--primary:hover {
    border-color: var(--ds-primary-hover);
    background: var(--ds-primary-hover);
}

.ds-loader-btn:focus-visible {
    outline: 2px solid var(--ds-focus-ring);
    outline-offset: 2px;
}

/* --- Narrower screens ---------------------------------------------------------- */
@media (max-width: 1279.98px) {
    .ds-loader-bar-tabs .ds-sk--tab:nth-child(n + 3) {
        display: none;
    }
}

/* MudBlazor's md breakpoint: the dashboards fold their tabs into a menu and the
   admin drawers close. */
@media (max-width: 959.98px) {
    .ds-loader-bar {
        gap: 16px;
        padding: 0 16px;
    }

    .ds-loader-bar-tabs,
    .ds-loader-rail,
    .ds-loader-bar-end .ds-sk--pill {
        display: none;
    }

    .ds-loader-page {
        padding: 20px 16px;
        gap: 16px;
    }

    .ds-loader-grid {
        gap: 12px;
    }

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

    .ds-loader-grid--main,
    .ds-loader-grid--checkout {
        grid-template-columns: minmax(0, 1fr);
    }

    .ds-loader-card {
        padding: 14px;
        gap: 10px;
    }

    .ds-loader-status,
    .ds-loader-notice--slow {
        bottom: 20px;
    }
}

@media (max-width: 599.98px) {
    .ds-loader-title {
        font-size: var(--ds-text-16);
    }

    .ds-loader-grid--stats .ds-sk--meta {
        display: none;
    }
}

/* --- data-page="none": the folding cube in the middle of an empty page ------------ */
.ds-loader-body--center {
    display: flex;
    align-items: center;
    justify-content: center;
}

.ds-loader-cube {
    width: 48px;
    height: 48px;
    transform: rotateZ(45deg);
}

.ds-loader-cube span {
    float: left;
    position: relative;
    width: 50%;
    height: 50%;
    transform: scale(1.1);
}

.ds-loader-cube span::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--ds-loader-progress, var(--ds-primary));
    transform-origin: 100% 100%;
    animation: ds-loader-fold 2.4s infinite linear both;
}

.ds-loader-cube span:nth-child(2) { transform: scale(1.1) rotateZ(90deg); }
.ds-loader-cube span:nth-child(3) { transform: scale(1.1) rotateZ(270deg); }
.ds-loader-cube span:nth-child(4) { transform: scale(1.1) rotateZ(180deg); }
.ds-loader-cube span:nth-child(2)::before { animation-delay: 0.3s; }
.ds-loader-cube span:nth-child(3)::before { animation-delay: 0.9s; }
.ds-loader-cube span:nth-child(4)::before { animation-delay: 0.6s; }

@keyframes ds-loader-fold {
    0%, 10% { transform: perspective(140px) rotateX(-180deg); opacity: 0; }
    25%, 75% { transform: perspective(140px) rotateX(0deg); opacity: 1; }
    90%, 100% { transform: perspective(140px) rotateY(180deg); opacity: 0; }
}

.ds-loader.is-failed .ds-loader-cube {
    display: none;
}

/* --- Reduced motion ------------------------------------------------------------ */
@media (prefers-reduced-motion: reduce) {
    .ds-loader,
    .ds-loader-progress {
        transition: none;
    }

    .ds-sk,
    .ds-loader-cube span::before,
    .ds-loader-dot,
    .ds-loader-shell,
    .ds-loader-progress,
    .ds-loader-status,
    .ds-loader-notice {
        animation: none;
    }

    .ds-loader.is-plain .ds-loader-progress {
        animation: none;
        width: 100%;
        opacity: 0.6;
    }
}