/*
 * FeedWatch styles (plan 006). Mobile first: phone, then tablet (768px)
 * and desktop (1280px). Values come from tokens.css.
 */
*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    -webkit-text-size-adjust: 100%;
}

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

a {
    color: var(--color-link);
}

h1, h2, h3, p, ul, ol, dl {
    margin: 0;
}

ul, ol {
    padding: 0;
    list-style: none;
}

button,
select,
input {
    font: inherit;
    color: inherit;
}

/* A clear focus ring on everything (NFR-02 AC-3). */
:focus-visible {
    outline: 3px solid var(--color-focus);
    outline-offset: 2px;
}

.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;
}

.skip-link {
    position: absolute;
    top: -3rem;
    left: var(--space-4);
    padding: var(--space-2) var(--space-3);
    background: var(--color-surface-raised);
    border-radius: var(--radius-sm);
    z-index: 1100;
}

.skip-link:focus {
    top: var(--space-2);
}

/* Header */
.site-header {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--space-2) var(--space-6);
    padding: var(--space-3) var(--space-4);
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    color: var(--color-text);
    font-weight: 700;
    font-size: var(--text-lg);
    text-decoration: none;
}

.brand__mark {
    width: 0.9rem;
    height: 0.9rem;
    border-radius: 50%;
    background: var(--color-healthy);
    box-shadow: 0 0 0 3px var(--color-surface), 0 0 0 5px var(--color-healthy);
}

.site-nav {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-1) var(--space-4);
}

.site-nav a {
    color: var(--color-text-muted);
    text-decoration: none;
    padding: var(--space-1) 0;
    border-bottom: 2px solid transparent;
}

.site-nav a[aria-current="page"] {
    color: var(--color-text);
    border-bottom-color: var(--color-link);
}

.site-header__note {
    margin-left: auto;
    color: var(--color-text-muted);
    font-size: var(--text-xs);
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

/* Stale banner (FR-05 AC-5) */
.stale-banner {
    padding: var(--space-2) var(--space-4);
    background: var(--color-stale-bg);
    color: var(--color-text);
    font-size: var(--text-sm);
    border-bottom: 1px solid var(--color-degraded);
}

.stale-banner::before {
    content: "\23F1\FE0E  "; /* stopwatch, as text */
}

/* Shared panels */
.panel-heading,
.detail__subheading {
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--space-2);
}

.detail__subheading {
    margin-top: var(--space-4);
}

.empty,
.loading {
    color: var(--color-text-muted);
    font-size: var(--text-sm);
    padding: var(--space-3) 0;
}

.skeleton {
    display: inline-block;
    min-width: 4ch;
    border-radius: var(--radius-sm);
    background: var(--color-surface-raised);
}

.skeleton-row {
    padding: var(--space-3);
}

.skeleton-row .skeleton {
    width: 100%;
}

/* Status: always a shape and a label, never colour alone (FR-05 AC-3). */
.status {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
}

.status__shape {
    flex: none;
    width: 0.8rem;
    height: 0.8rem;
}

.status--healthy .status__shape {
    border-radius: 50%;
    background: var(--color-healthy);
}

.status--degraded .status__shape {
    background: var(--color-degraded);
    clip-path: polygon(50% 0, 100% 100%, 0 100%);
}

.status--down .status__shape {
    background: var(--color-down);
    border-radius: 1px;
}

.status--unknown .status__shape {
    border: 2px dashed var(--color-neutral);
    border-radius: 50%;
}

.status-line {
    font-size: var(--text-sm);
}

/* Dashboard layout: phone first */
.dashboard {
    display: grid;
    gap: var(--space-4);
    padding: var(--space-4);
    grid-template-columns: minmax(0, 1fr);
    grid-template-areas:
        "tiles"
        "switch"
        "list"
        "map"
        "alerts";
}

.tiles { grid-area: tiles; }
.view-switch { grid-area: switch; }
.map-panel { grid-area: map; }
.exchange-list { grid-area: list; }
.alerts { grid-area: alerts; }

.tiles {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-3);
}

.tile {
    padding: var(--space-3);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
}

.tile__label {
    color: var(--color-text-muted);
    font-size: var(--text-xs);
}

.tile__value {
    font-family: var(--font-mono);
    font-size: var(--text-xl);
    font-variant-numeric: tabular-nums;
    line-height: 1.2;
}

.view-switch {
    display: inline-flex;
    justify-self: start;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.view-switch__button {
    padding: var(--space-2) var(--space-4);
    background: var(--color-surface);
    border: 0;
    cursor: pointer;
}

.view-switch__button[aria-pressed="true"] {
    background: var(--color-surface-raised);
    font-weight: 600;
    box-shadow: inset 0 -2px 0 var(--color-link);
}

/* On a phone, only one of list and map shows at a time. */
.dashboard[data-view="list"] .map-panel,
.dashboard[data-view="map"] .exchange-list {
    display: none;
}

.map {
    height: 60vh;
    min-height: 280px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-bg);
}

/* Leaflet controls on the dark console */
.leaflet-container {
    background: var(--color-bg);
    font-family: var(--font-sans);
}

.leaflet-bar a,
.leaflet-bar a:hover {
    background: var(--color-surface-raised);
    color: var(--color-text);
    border-bottom-color: var(--color-border);
}

/* OpenStreetMap's tiles are light; invert them for the dark console. */
.leaflet-tile-pane {
    filter: invert(100%) hue-rotate(180deg) brightness(90%) contrast(85%) saturate(60%);
}

@media (prefers-color-scheme: light) {
    .leaflet-tile-pane {
        filter: none;
    }
}

.leaflet-control-attribution {
    background: rgb(0 0 0 / 0.55) !important;
    color: #c9d1d9 !important;
}

.leaflet-control-attribution a {
    color: #9ecbff !important;
}

/* Exchange markers: a shape per status, with a text label for screen readers */
.marker {
    display: grid;
    place-items: center;
    width: 26px !important;
    height: 26px !important;
    margin: -13px 0 0 -13px !important;
}

.marker__shape {
    width: 16px;
    height: 16px;
    box-shadow: 0 0 0 2px var(--color-bg);
}

.marker--healthy .marker__shape { border-radius: 50%; background: var(--color-healthy); }
.marker--degraded .marker__shape { background: var(--color-degraded); clip-path: polygon(50% 0, 100% 100%, 0 100%); width: 20px; height: 18px; box-shadow: none; }
.marker--down .marker__shape { background: var(--color-down); width: 16px; height: 16px; }
.marker--unknown .marker__shape { border: 2px dashed var(--color-neutral); border-radius: 50%; box-shadow: none; }

.marker--selected .marker__shape {
    outline: 2px solid var(--color-text);
    outline-offset: 3px;
}

.marker--pulse .marker__shape {
    animation: pulse var(--duration-pulse) ease-out 1;
}

@keyframes pulse {
    0% { transform: scale(1); }
    30% { transform: scale(1.7); }
    100% { transform: scale(1); }
}

.marker__label {
    position: absolute;
    font-size: var(--text-xs);
    font-weight: 600;
    color: #e6edf3;
    text-shadow: 0 0 3px #000, 0 0 3px #000;
    white-space: nowrap;
    pointer-events: none;
}

.marker__label--below { top: 24px; }
.marker__label--left { right: 26px; top: 4px; }
.marker__label--right { left: 26px; top: 4px; }

/* Exchange list */
.exchange-list__items {
    display: grid;
    gap: var(--space-2);
}

.exchange-button {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr) auto;
    align-items: center;
    gap: var(--space-1) var(--space-3);
    width: 100%;
    padding: var(--space-3);
    text-align: left;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    cursor: pointer;
}

.exchange-button[aria-expanded="true"] {
    border-color: var(--color-link);
}

.exchange-button__code {
    font-family: var(--font-mono);
    font-weight: 700;
}

.exchange-button__name {
    color: var(--color-text-muted);
    font-size: var(--text-sm);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.exchange-button__latency {
    font-family: var(--font-mono);
    font-size: var(--text-xs);
    color: var(--color-text-muted);
    font-variant-numeric: tabular-nums;
    text-align: right;
}

.exchange-button__status {
    grid-column: 1 / -1;
    font-size: var(--text-sm);
}

/* Alert feed */
.alerts__items {
    display: grid;
    gap: var(--space-2);
}

.alert-item {
    padding: var(--space-2) var(--space-3);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-left-width: 4px;
    border-radius: var(--radius-sm);
    font-size: var(--text-sm);
}

.alert-item--critical { border-left-color: var(--color-down); }
.alert-item--major { border-left-color: var(--color-degraded); }
.alert-item--warning { border-left-color: var(--color-degraded); }

.alert-item__meta {
    color: var(--color-text-muted);
    font-size: var(--text-xs);
}

.alerts__more {
    margin-top: var(--space-2);
    font-size: var(--text-sm);
}

.badge {
    display: inline-block;
    padding: 0 var(--space-2);
    border: 1px solid var(--color-border);
    border-radius: 999px;
    font-size: var(--text-xs);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

/* Detail panel: full screen on a phone */
.detail {
    position: fixed;
    inset: 0;
    z-index: 1000;
    overflow-y: auto;
    padding: var(--space-4);
    background: var(--color-surface);
}

.detail__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-3);
    margin-bottom: var(--space-2);
}

.detail__title {
    font-size: var(--text-lg);
}

.detail__close {
    padding: var(--space-1) var(--space-3);
    background: var(--color-surface-raised);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    cursor: pointer;
}

.feeds {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-2);
    margin-top: var(--space-3);
}

.feed-card {
    padding: var(--space-2) var(--space-3);
    background: var(--color-surface-raised);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-size: var(--text-sm);
}

.feed-card__value {
    font-family: var(--font-mono);
    font-variant-numeric: tabular-nums;
    font-size: var(--text-lg);
}

.chart-wrap {
    position: relative;
    height: 220px;
}

.chart-summary {
    margin-top: var(--space-2);
    color: var(--color-text-muted);
    font-size: var(--text-sm);
}

.win-share {
    font-size: var(--text-sm);
}

.win-share__bar {
    display: flex;
    height: 0.75rem;
    margin: var(--space-1) 0;
    overflow: hidden;
    border-radius: var(--radius-sm);
    background: var(--color-surface-raised);
}

.win-share__a { background: var(--color-series-a); }
.win-share__b { background: var(--color-series-b); }

.gap-list {
    display: grid;
    gap: var(--space-1);
    font-size: var(--text-sm);
}

/* Incident log page */
.incidents-page {
    padding: var(--space-4);
}

.page-title {
    font-size: var(--text-xl);
    margin-bottom: var(--space-4);
}

.filters {
    display: flex;
    flex-wrap: wrap;
    align-items: flex-end;
    gap: var(--space-3);
    margin-bottom: var(--space-4);
}

.filters label {
    display: grid;
    gap: var(--space-1);
    font-size: var(--text-sm);
    color: var(--color-text-muted);
}

.filters select,
.filters input,
.filters button {
    min-height: 2.5rem;
    padding: var(--space-1) var(--space-2);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
}

.filters button {
    padding: var(--space-1) var(--space-4);
    background: var(--color-surface-raised);
    cursor: pointer;
}

.incidents-layout {
    display: grid;
    gap: var(--space-4);
}

.incident-list {
    display: grid;
    gap: var(--space-2);
}

.incident-link {
    display: block;
    padding: var(--space-3);
    color: var(--color-text);
    text-decoration: none;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
}

.incident-link[aria-current="true"] {
    border-color: var(--color-link);
}

.incident-detail {
    padding: var(--space-4);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
}

.facts {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: var(--space-1) var(--space-4);
    margin-top: var(--space-3);
    font-size: var(--text-sm);
}

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

.facts dd {
    margin: 0;
}

.timeline {
    display: grid;
    gap: var(--space-2);
    padding-left: var(--space-4);
    border-left: 2px solid var(--color-border);
    font-size: var(--text-sm);
}

.timeline time {
    display: block;
    color: var(--color-text-muted);
    font-size: var(--text-xs);
    font-family: var(--font-mono);
}

/* The plan 001 error page */
.page {
    max-width: 40rem;
    margin: 0 auto;
    padding: var(--space-8) var(--space-4);
}

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

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

/* Tablet: map on top, list and alerts side by side below */
@media (min-width: 768px) {
    .dashboard {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        grid-template-areas:
            "tiles tiles"
            "map map"
            "list alerts";
    }

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

    .view-switch {
        display: none;
    }

    .dashboard[data-view] .map-panel,
    .dashboard[data-view] .exchange-list {
        display: block;
    }

    .map {
        height: 420px;
    }

    .detail {
        inset: auto var(--space-4) var(--space-4) auto;
        top: 5rem;
        width: min(440px, calc(100vw - 2rem));
        border: 1px solid var(--color-border);
        border-radius: var(--radius-md);
        box-shadow: var(--shadow-panel);
    }

    .incidents-layout {
        grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
        align-items: start;
    }
}

/* Desktop: tiles on top, list | map | alerts, detail over the alerts */
@media (min-width: 1280px) {
    .dashboard {
        grid-template-columns: 300px minmax(0, 1fr) 340px;
        grid-template-areas:
            "tiles tiles tiles"
            "list map alerts";
        align-items: start;
    }

    .map {
        height: calc(100vh - 13rem);
        min-height: 480px;
    }

    .detail {
        top: 9.5rem;
        right: var(--space-4);
        bottom: var(--space-4);
        width: 340px;
    }
}

/* Chaos banner: every visitor sees when a simulated fault is active (ADR-007) */
.chaos-banner {
    padding: var(--space-2) var(--space-4);
    background: var(--color-stale-bg);
    color: var(--color-text);
    font-size: var(--text-sm);
    border-bottom: 2px solid var(--color-down);
}

.chaos-banner::before {
    content: "\26A0\FE0E  "; /* warning sign, as text */
}

/* Admin pages (plan 007) */
.admin-page {
    max-width: 64rem;
    margin: 0 auto;
    padding: var(--space-4);
}

.admin-page--narrow {
    max-width: 28rem;
}

.admin-header {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-3);
}

.admin-section {
    margin-top: var(--space-6);
    padding: var(--space-4);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
}

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

.button-chaos,
.button-restore,
.button-secondary,
.login-form button,
.note-form button,
#custom-fault button {
    min-height: 2.5rem;
    padding: var(--space-2) var(--space-4);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: var(--color-surface-raised);
    cursor: pointer;
}

.button-chaos {
    border-color: var(--color-degraded);
}

.button-restore {
    border-color: var(--color-healthy);
    font-weight: 600;
}

.form-message {
    margin: var(--space-3) 0;
    padding: var(--space-2) var(--space-3);
    border-left: 4px solid var(--color-healthy);
    background: var(--color-surface-raised);
    font-size: var(--text-sm);
}

.form-message--error {
    border-left-color: var(--color-down);
}

.login-form,
.note-form {
    display: grid;
    gap: var(--space-3);
    margin-top: var(--space-4);
}

.login-form label,
.note-form label,
.settings-row label {
    display: grid;
    gap: var(--space-1);
    font-size: var(--text-sm);
    color: var(--color-text-muted);
}

.login-form input,
.note-form textarea,
.settings-row input {
    min-height: 2.5rem;
    padding: var(--space-2);
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
}

.settings-form {
    display: grid;
    gap: var(--space-3);
}

.settings-row {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
    gap: var(--space-1) var(--space-3);
}

.settings-row .tile__label {
    grid-column: 1;
}

.settings-row .button-secondary {
    grid-column: 2;
    grid-row: 1;
}

.fault-item {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-3);
    background: var(--color-surface-raised);
    border: 1px solid var(--color-border);
    border-left: 4px solid var(--color-degraded);
    border-radius: var(--radius-sm);
    font-size: var(--text-sm);
}

/* About page (plan 008): reading width, numbered steps and the diagram */
.about {
    max-width: 52rem;
    margin: 0 auto;
    padding: var(--space-6) var(--space-4) var(--space-8);
}

.about__intro {
    display: grid;
    gap: var(--space-2);
    margin-bottom: var(--space-6);
}

.about__intro .page-title {
    margin-bottom: 0;
}

.about__lead {
    font-size: var(--text-lg);
    color: var(--color-text-muted);
}

.about__contents {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2) var(--space-4);
    font-size: var(--text-sm);
}

.about__section {
    display: grid;
    gap: var(--space-3);
    padding-top: var(--space-6);
    margin-top: var(--space-6);
    border-top: 1px solid var(--color-border);
    scroll-margin-top: var(--space-4);
}

.about__section h2 {
    font-size: var(--text-xl);
}

.about__section h3 {
    font-size: var(--text-base);
}

.table-wrap {
    overflow-x: auto;
}

.about__table {
    width: 100%;
    border-collapse: collapse;
    font-size: var(--text-sm);
}

.about__table caption {
    text-align: left;
    color: var(--color-text-muted);
    padding-bottom: var(--space-2);
}

.about__table th,
.about__table td {
    padding: var(--space-2) var(--space-3);
    text-align: left;
    vertical-align: top;
    border-bottom: 1px solid var(--color-border);
}

.about__table th {
    background: var(--color-surface-raised);
}

/* Numbered cards: the counter is text, so the order doesn't depend on colour */
.steps,
.process {
    display: grid;
    gap: var(--space-3);
    counter-reset: step;
}

.steps__item,
.process__item {
    display: grid;
    gap: var(--space-1);
    align-content: start;
    padding: var(--space-3) var(--space-4);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-left: 4px solid var(--color-link);
    border-radius: var(--radius-md);
    counter-increment: step;
}

.steps__item h3::before,
.process__item h3::before {
    content: counter(step) ". ";
    color: var(--color-text-muted);
    font-family: var(--font-mono);
}

.steps__item p,
.process__item p {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
}

.diagram {
    margin: 0;
    display: grid;
    gap: var(--space-2);
    justify-items: center;
    padding: var(--space-3) var(--space-2);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
}

.diagram__svg {
    width: 100%;
    max-width: 30rem;
    height: auto;
}

.diagram figcaption {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
}

.diagram__box {
    fill: var(--color-surface-raised);
    stroke: var(--color-border);
    stroke-width: 1.5;
}

.diagram__box--step {
    fill: var(--color-bg);
    stroke: var(--color-link);
}

.diagram__group {
    fill: none;
    stroke: var(--color-text-muted);
    stroke-width: 1.5;
    stroke-dasharray: 6 4;
}

.diagram__line {
    stroke: var(--color-text-muted);
    stroke-width: 1.5;
}

.diagram__line--dashed {
    stroke-dasharray: 5 4;
}

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

.diagram__title,
.diagram__sub,
.diagram__label {
    font-family: var(--font-sans);
    text-anchor: middle;
}

.diagram__title {
    fill: var(--color-text);
    font-size: 16px;
    font-weight: 700;
}

.diagram__sub {
    fill: var(--color-text-muted);
    font-size: 13.5px;
}

.diagram__label {
    fill: var(--color-text-muted);
    font-size: 13px;
    text-anchor: start;
}

.diagram__label[transform] {
    text-anchor: middle;
}

.about__parts {
    display: grid;
    gap: var(--space-1) var(--space-4);
    font-size: var(--text-sm);
}

.about__parts dt {
    font-weight: 700;
    margin-top: var(--space-2);
}

.about__parts dd {
    margin: 0;
    color: var(--color-text-muted);
}

.about__list {
    display: grid;
    gap: var(--space-2);
    padding-left: var(--space-6);
    list-style: disc;
}

@media (min-width: 768px) {
    .steps,
    .process {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .about__parts {
        grid-template-columns: 12rem minmax(0, 1fr);
    }

    .about__parts dt {
        margin-top: 0;
    }
}

@media (min-width: 768px) {
    .diagram {
        padding: var(--space-4);
    }
}