/*
 * MultiOnline — system pages (installer, error pages, placeholders).
 * No web fonts, no images, no JavaScript: renders instantly and works under a strict CSP.
 * Theme pages never load this file.
 */

:root {
    color-scheme: light dark;
    --sys-bg: #f4f3ef;
    --sys-surface: #ffffff;
    --sys-surface-2: #f8f7f4;
    --sys-text: #1c1f23;
    --sys-muted: #5d6470;
    --sys-border: #dedbd3;
    --sys-accent: #0b5d6b;
    --sys-accent-hover: #084955;
    --sys-accent-text: #ffffff;
    --sys-accent-soft: #e2f0f1;
    --sys-ok: #1d7a46;
    --sys-warn: #9a5b00;
    --sys-warn-soft: #fbf1df;
    --sys-fail: #b42318;
    --sys-fail-soft: #fdecea;
    --sys-info-soft: #e8eff8;
    --sys-radius: 10px;
    --sys-focus: 0 0 0 3px color-mix(in srgb, var(--sys-accent) 35%, transparent);
    --sys-font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --sys-mono: ui-monospace, "SFMono-Regular", Menlo, Consolas, "Liberation Mono", monospace;
}

@media (prefers-color-scheme: dark) {
    :root {
        --sys-bg: #121417;
        --sys-surface: #1b1e22;
        --sys-surface-2: #22262b;
        --sys-text: #e9ebee;
        --sys-muted: #9aa2ad;
        --sys-border: #30353c;
        --sys-accent: #4fb3c1;
        --sys-accent-hover: #6cc4d0;
        --sys-accent-text: #0b1a1d;
        --sys-accent-soft: #15333a;
        --sys-ok: #5cc98a;
        --sys-warn: #e5a54b;
        --sys-warn-soft: #33280f;
        --sys-fail: #f2786d;
        --sys-fail-soft: #3a1b18;
        --sys-info-soft: #1b2a3a;
    }
}

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

.sys {
    margin: 0;
    min-height: 100vh;
    background: var(--sys-bg);
    color: var(--sys-text);
    font: 16px/1.55 var(--sys-font);
    -webkit-text-size-adjust: 100%;
}

.sys--center {
    display: grid;
    place-items: center;
    padding: 1.5rem;
}

.sys a {
    color: var(--sys-accent);
}

.sys-visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Layout ---------------------------------------------------------------- */

.sys-shell {
    max-width: 44rem;
    margin: 0 auto;
    padding: 1.25rem 1rem 2.5rem;
}

.sys-header {
    display: flex;
    flex-wrap: wrap;
    gap: .75rem;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1.25rem;
}

.sys-brand {
    display: flex;
    gap: .6rem;
    align-items: center;
    font-weight: 650;
    letter-spacing: -.01em;
}

.sys-brand__mark {
    display: inline-grid;
    place-items: center;
    width: 2rem;
    height: 2rem;
    border-radius: 8px;
    background: var(--sys-accent);
    color: var(--sys-accent-text);
    font-weight: 750;
}

.sys-lang {
    display: flex;
    gap: .4rem;
    align-items: center;
}

.sys-lang select {
    font: inherit;
    font-size: .9rem;
    padding: .3rem .5rem;
    border: 1px solid var(--sys-border);
    border-radius: 8px;
    background: var(--sys-surface);
    color: var(--sys-text);
}

.sys-card {
    background: var(--sys-surface);
    border: 1px solid var(--sys-border);
    border-radius: var(--sys-radius);
    padding: 1.5rem;
}

.sys-card--narrow {
    width: 100%;
    max-width: 30rem;
    text-align: center;
}

.sys-footer {
    margin-top: 1.25rem;
    color: var(--sys-muted);
    font-size: .8rem;
    text-align: center;
}

@media (min-width: 40rem) {
    .sys-shell {
        padding-top: 2.5rem;
    }

    .sys-card {
        padding: 2rem 2.25rem;
    }
}

/* Steps ----------------------------------------------------------------- */

.sys-steps {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: .5rem;
    margin: 0 0 1.25rem;
    padding: 0;
    list-style: none;
    counter-reset: none;
}

.sys-steps__item {
    display: flex;
    flex-direction: column;
    gap: .35rem;
    padding-top: .6rem;
    border-top: 3px solid var(--sys-border);
    color: var(--sys-muted);
    font-size: .8rem;
}

.sys-steps__item.is-done {
    border-top-color: color-mix(in srgb, var(--sys-accent) 45%, var(--sys-border));
}

.sys-steps__item.is-current {
    border-top-color: var(--sys-accent);
    color: var(--sys-text);
    font-weight: 600;
}

.sys-steps__num {
    font-variant-numeric: tabular-nums;
    font-size: .75rem;
    color: var(--sys-muted);
}

@media (max-width: 30rem) {
    .sys-steps__item:not(.is-current) .sys-steps__label {
        position: absolute;
        width: 1px;
        height: 1px;
        overflow: hidden;
        clip: rect(0, 0, 0, 0);
    }
}

/* Typography ------------------------------------------------------------ */

.sys-title {
    margin: 0 0 .4rem;
    font-size: 1.45rem;
    line-height: 1.25;
    letter-spacing: -.015em;
}

.sys-subtitle {
    margin: 1.75rem 0 .75rem;
    padding: 0;
    font-size: 1rem;
    font-weight: 650;
    color: var(--sys-text);
}

.sys-lead {
    margin: 0 0 1rem;
    color: var(--sys-muted);
}

.sys-status {
    margin: 0 0 .25rem;
    font-size: 3rem;
    font-weight: 750;
    line-height: 1;
    color: var(--sys-accent);
    font-variant-numeric: tabular-nums;
}

.sys-mono,
.sys-code {
    font-family: var(--sys-mono);
    font-size: .875rem;
    overflow-wrap: anywhere;
}

.sys-code {
    display: block;
    margin: 0 0 1rem;
    padding: .65rem .8rem;
    border: 1px solid var(--sys-border);
    border-radius: 8px;
    background: var(--sys-surface-2);
    user-select: all;
}

.sys-dl {
    margin: 0;
}

.sys-dl dt {
    font-size: .85rem;
    font-weight: 600;
    margin-bottom: .3rem;
}

.sys-dl dd {
    margin: 0 0 1rem;
}

/* Requirement checks ---------------------------------------------------- */

.sys-checks {
    margin: 0;
    padding: 0;
    list-style: none;
    border: 1px solid var(--sys-border);
    border-radius: 8px;
    overflow: hidden;
}

.sys-check {
    display: grid;
    grid-template-columns: 1.25rem 1fr auto;
    gap: .75rem;
    align-items: start;
    padding: .6rem .8rem;
    font-size: .925rem;
}

.sys-check + .sys-check {
    border-top: 1px solid var(--sys-border);
}

.sys-check__icon {
    width: .7rem;
    height: .7rem;
    margin-top: .45rem;
    border-radius: 50%;
    background: var(--sys-ok);
}

.sys-check--warn .sys-check__icon {
    background: var(--sys-warn);
}

.sys-check--fail {
    background: var(--sys-fail-soft);
}

.sys-check--fail .sys-check__icon {
    border-radius: 2px;
    background: var(--sys-fail);
}

.sys-check__body {
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.sys-check__label {
    font-family: var(--sys-mono);
    font-size: .85rem;
}

.sys-check__hint {
    color: var(--sys-muted);
    font-size: .825rem;
}

.sys-check__value {
    color: var(--sys-muted);
    font-size: .85rem;
    text-align: end;
}

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

.sys-fieldset {
    margin: 0;
    padding: 0;
    border: 0;
    min-width: 0;
}

.sys-grid {
    display: grid;
    gap: 0 1rem;
}

@media (min-width: 36rem) {
    .sys-grid {
        grid-template-columns: 1fr 1fr;
    }

    .sys-grid--host {
        grid-template-columns: 1fr 7rem;
    }
}

.sys-field {
    margin-bottom: 1rem;
    min-width: 0;
}

.sys-label {
    display: block;
    margin-bottom: .3rem;
    font-size: .9rem;
    font-weight: 600;
}

.sys-input {
    display: block;
    width: 100%;
    min-height: 2.6rem;
    padding: .5rem .7rem;
    border: 1px solid var(--sys-border);
    border-radius: 8px;
    background: var(--sys-surface);
    color: var(--sys-text);
    font: inherit;
}

.sys-input:hover {
    border-color: color-mix(in srgb, var(--sys-text) 30%, var(--sys-border));
}

.sys-input:focus-visible,
.sys-btn:focus-visible,
.sys-lang select:focus-visible,
.sys-checkbox input:focus-visible {
    outline: none;
    border-color: var(--sys-accent);
    box-shadow: var(--sys-focus);
}

.has-error .sys-input {
    border-color: var(--sys-fail);
}

.sys-hint {
    margin: .3rem 0 0;
    color: var(--sys-muted);
    font-size: .825rem;
}

.sys-error {
    margin: .3rem 0 0;
    color: var(--sys-fail);
    font-size: .85rem;
    font-weight: 500;
}

.sys-checkbox {
    display: flex;
    gap: .5rem;
    align-items: flex-start;
    margin-top: .5rem;
    font-weight: 500;
}

.sys-checkbox input {
    width: 1.1rem;
    height: 1.1rem;
    margin: .2rem 0 0;
    accent-color: var(--sys-accent);
}

/* Buttons & alerts ------------------------------------------------------ */

.sys-actions {
    display: flex;
    flex-wrap: wrap;
    gap: .75rem;
    align-items: center;
    justify-content: flex-end;
    margin-top: 1.75rem;
}

.sys-actions--center {
    justify-content: center;
}

.sys-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 2.6rem;
    padding: .5rem 1.1rem;
    border: 1px solid var(--sys-border);
    border-radius: 8px;
    background: var(--sys-surface);
    color: var(--sys-text);
    font: inherit;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
}

.sys a.sys-btn {
    color: var(--sys-text);
}

.sys-btn:hover {
    background: var(--sys-surface-2);
}

.sys-btn--primary,
.sys a.sys-btn--primary {
    border-color: var(--sys-accent);
    background: var(--sys-accent);
    color: var(--sys-accent-text);
}

.sys-btn--primary:hover {
    border-color: var(--sys-accent-hover);
    background: var(--sys-accent-hover);
}

.sys-btn--ghost {
    border-color: transparent;
    background: transparent;
}

.sys-btn--sm {
    min-height: 2rem;
    padding: .25rem .7rem;
    font-size: .85rem;
}

.sys-alert {
    margin: 1rem 0;
    padding: .8rem 1rem;
    border-radius: 8px;
    border: 1px solid transparent;
    font-size: .925rem;
}

.sys-alert p {
    margin: 0 0 .4rem;
}

.sys-alert--error {
    background: var(--sys-fail-soft);
    border-color: color-mix(in srgb, var(--sys-fail) 35%, transparent);
}

.sys-alert--warn {
    background: var(--sys-warn-soft);
    border-color: color-mix(in srgb, var(--sys-warn) 35%, transparent);
}

.sys-alert--info {
    background: var(--sys-info-soft);
}

.sys-actions .sys-alert {
    flex-basis: 100%;
    margin: 0;
}

@media (prefers-reduced-motion: no-preference) {
    .sys-btn,
    .sys-input {
        transition: background-color .15s, border-color .15s, box-shadow .15s;
    }
}