/*
 * Write_On mode layout and corner chrome (issue #7; spec R-2.1, R-7.1, R-7.2)
 * ===========================================================================
 *
 * Consumes the tokens in public/css/tokens.css; no colours, fonts or radii
 * are hard-coded here. The chrome DOM is built by public/js/chrome.js.
 *
 * Plain mode (default): the text and the dim word/char counter in the
 * top-left corner, nothing more (R-2.1, R-7.1; issue #86), on the same dark
 * page and centred column as Write_On (the video at 0:00 to 0:05; #107). The toolbar and
 * the preview pane are hidden unless the chrome sets data-tools="on" on the
 * editor root (Ctrl+Shift+L, chrome.setTools(), config.tools). The corner
 * controls carry the `hidden` attribute.
 *
 * Write_On mode (data-mode="write-on" on the editor root, .te-app, and on
 * <body> on the full page only; issue #77): full-bleed dark page, the
 * writing surface as a centred ~70ch column, no toolbar, no preview pane,
 * and the corner controls of R-7.2.
 */

/* ---- Plain mode: text and counter only (R-2.1, R-7.1; issue #86) ----
   Keyed on the absence of data-tools="on", so the toolbar and the preview
   are hidden by default; the Write_On rules below hide them regardless. */

.te-app:not([data-mode="write-on"]):not([data-tools="on"]) .toolbar,
.te-app:not([data-mode="write-on"]):not([data-tools="on"]) .editor-container [slot="end"] {
    display: none;
}

/* As in Write_On: a block host leaves only the writing surface in flow. */
.te-app:not([data-mode="write-on"]):not([data-tools="on"]) sl-split-panel {
    display: block !important;
    height: auto;
}

.te-app:not([data-mode="write-on"]):not([data-tools="on"]) sl-split-panel::part(divider) {
    display: none;
}

/* ---- Page layout, Write_On and plain (R-7.1) ----
   Plain mode lays the text out as Write_On does, as in the video at 0:05:
   the centred column on the dark page, the counter top-left (issue #107).
   The tools view (data-tools="on") keeps the Markdown editor's layout. */

/* #app.te-app outranks the full page's inline #app rule. */
.te-app[data-mode="write-on"],
#app.te-app[data-mode="write-on"],
.te-app:not([data-mode="write-on"]):not([data-tools="on"]),
#app.te-app:not([data-mode="write-on"]):not([data-tools="on"]) {
    height: auto;
    min-height: 100vh;
    padding: 0;
}

.te-app[data-mode="write-on"] .toolbar,
.te-app[data-mode="write-on"] .editor-container [slot="end"] {
    display: none;
}

/* Shoelace writes grid-template-columns inline on the host; a block host
   stacks the slots and leaves only the writing surface in flow. */
.te-app[data-mode="write-on"] sl-split-panel {
    display: block !important;
    height: auto;
}

.te-app[data-mode="write-on"] sl-split-panel::part(divider) {
    display: none;
}

.te-app[data-mode="write-on"] .markdown-input.te-surface,
.te-app:not([data-mode="write-on"]):not([data-tools="on"]) .markdown-input.te-surface {
    width: auto;
    height: auto;
    min-height: calc(100vh - var(--te-page-margin-top) - 6rem);
    padding-inline: 1.5rem;
    padding-bottom: 6rem;
    overflow: visible;
    outline: none;
    font-size: var(--te-font-size-body);
}

.te-app[data-mode="write-on"] .markdown-input.te-surface:empty::before,
.te-app:not([data-mode="write-on"]):not([data-tools="on"]) .markdown-input.te-surface:empty::before {
    color: var(--te-color-text-dim);
    opacity: 1;
}

/* ---- Corner chrome ---- */

.te-chrome [hidden] {
    display: none !important;
}

/* Zero-specificity reset so the per-control rules below win without. */
:where(.te-chrome) button {
    margin: 0;
    border: 0;
    background: none;
    color: inherit;
    font: inherit;
    cursor: pointer;
}

.te-chrome button:focus-visible {
    outline: 2px solid var(--te-color-accent);
    outline-offset: 2px;
    border-radius: 4px;
}

/* Top-left counter: dim monospace, visible in both modes, at the same place
   in each (the video at 0:05 and 0:25). In the tools view it sits in the
   20px band above the toolbar. */
.te-chrome-counter {
    position: fixed;
    top: 1px;
    left: 20px;
    z-index: 20;
    display: inline-flex;
    align-items: baseline;
    gap: 0.5ch;
    padding: 0 0.25rem;
    font-family: var(--te-font-mono);
    font-size: 0.75rem;
    line-height: 18px;
    letter-spacing: 0.02em;
    color: var(--te-color-text-dim);
    white-space: nowrap;
    font-variant-numeric: tabular-nums;
}

.te-chrome-counter:hover .te-chrome-counter-text {
    text-decoration: underline;
    text-decoration-color: var(--te-color-accent-soft);
    text-underline-offset: 3px;
}

.te-chrome-counter-arrow {
    visibility: hidden;
    color: var(--te-color-accent);
}

.te-chrome-on .te-chrome-counter,
.te-app:not([data-mode="write-on"]):not([data-tools="on"]) .te-chrome-counter {
    top: 1.25rem;
    left: 1.5rem;
    font-size: 0.8125rem;
}

.te-chrome-on .te-chrome-counter-arrow {
    visibility: visible;
}

.te-chrome-group {
    position: fixed;
    /* Keep corner controls above the full-height side panels (z-index 20). */
    z-index: 21;
    display: flex;
    align-items: center;
    gap: 1.25rem;
    font-family: var(--te-font-mono);
    font-size: 0.8125rem;
    line-height: 1;
    color: var(--te-color-text-dim);
}

.te-chrome-top-centre { top: 1.25rem; left: 50%; transform: translateX(-50%); }
.te-chrome-top-right { top: 1.25rem; right: 1.5rem; }
.te-chrome-bottom-left { bottom: 1.25rem; left: 1.5rem; }
.te-chrome-bottom-centre { bottom: 1.25rem; left: 50%; transform: translateX(-50%); }
.te-chrome-bottom-right { bottom: 1.25rem; right: 1.5rem; }

.te-chrome-control {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 1.75rem;
    min-height: 1.75rem;
    padding: 0.25rem 0.375rem;
    transition: color 120ms ease;
}

.te-chrome-control:hover {
    color: var(--te-color-text);
}

.te-chrome-dots {
    color: var(--te-color-accent);
    letter-spacing: 0.15em;
    font-size: 0.625rem;
}

.te-chrome-markdown span {
    padding: 0.125rem 0.3rem;
    border: 1px solid currentColor;
    border-radius: 3px;
    font-size: 0.75rem;
}

.te-chrome-keyboard,
.te-chrome-open {
    font-size: 1rem;
}

.te-chrome-save {
    color: var(--te-color-accent);
    font-size: 1rem;
}

.te-chrome-lab {
    padding: 0.3rem 0.9rem;
    border: 1px dashed var(--te-color-text-dim);
    border-radius: 999px;
    letter-spacing: 0.2em;
    font-size: 0.6875rem;
}

.te-chrome-lab:hover {
    border-color: var(--te-color-accent);
}

.te-chrome-overflow {
    padding: 0.25rem 0.55rem;
    border: 1px solid var(--te-color-panel-border);
    border-radius: 6px;
    background: var(--te-color-panel);
    letter-spacing: 0.08em;
    font-size: 0.6875rem;
}

/* Lit lavender while the Overflow panel is open, as in the demo (4:05). */
.te-chrome-overflow[aria-expanded="true"] {
    border-color: var(--te-color-accent);
    color: var(--te-color-accent);
}

/* ---- Shortcut reference (R-7.3), a native <dialog> ---- */

.te-chrome-shortcuts {
    width: min(28rem, calc(100vw - 2rem));
    padding: 1rem 1.25rem 1.25rem;
    border: 1px solid var(--te-color-panel-border);
    border-radius: var(--te-radius-popover);
    background: var(--te-color-popover);
    color: var(--te-color-text);
    font-family: var(--te-font-mono);
    font-size: 0.8125rem;
    line-height: 1.5;
    color-scheme: dark;
}

.te-chrome-shortcuts::backdrop {
    background: rgba(10, 13, 28, 0.6);
}

.te-chrome-shortcuts-header {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
}

.te-chrome-shortcuts h2 {
    margin: 0;
    font-family: var(--te-font-display);
    font-size: 1.5rem;
    font-weight: 400;
}

.te-chrome-shortcuts h3 {
    margin: 1rem 0 0.25rem;
    font-size: 0.6875rem;
    font-weight: 400;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--te-color-text-dim);
}

.te-chrome-shortcuts dl {
    margin: 0;
}

.te-chrome-shortcut {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    padding: 0.3rem 0.5rem;
    margin-inline: -0.5rem;
    border-radius: 4px;
}

.te-chrome-shortcut:hover {
    background: var(--te-color-popover-hover);
}

.te-chrome-shortcut dt,
.te-chrome-shortcut dd {
    margin: 0;
}

.te-chrome-shortcut kbd {
    font-family: inherit;
    color: var(--te-color-text-dim);
}

.te-chrome-shortcut:hover kbd {
    color: var(--te-color-text);
}

.te-chrome-shortcuts-close {
    padding: 0 0.25rem;
    font-size: 1.25rem;
    color: var(--te-color-text-dim);
}

@media (max-width: 40rem) {
    .te-chrome-group { gap: 0.75rem; }
    .te-chrome-top-centre { top: 3rem; }
}

@media (prefers-reduced-motion: reduce) {
    .te-chrome-control { transition: none; }
}

/* ---- Document notice (issue #6): `.te-warning`, created by editor.js ----
   Plain mode keeps the browser default; in Write_On the notice sits on a
   panel in dim text so it reads against the dark page without shouting. */

.te-app[data-mode="write-on"] .te-warning {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    margin: 0 auto 1rem;
    max-width: var(--te-measure, 42rem);
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--te-color-panel-border);
    border-radius: var(--te-radius-popover);
    background: var(--te-color-panel);
    color: var(--te-color-text-dim);
    font-family: var(--te-font-mono);
    font-size: 0.8125rem;
    line-height: 1.5;
}

.te-app[data-mode="write-on"] .te-warning[hidden] {
    display: none;
}

.te-app[data-mode="write-on"] .te-warning-text {
    flex: 1;
}

.te-app[data-mode="write-on"] .te-warning-dismiss {
    padding: 0 0.25rem;
    border: none;
    background: transparent;
    color: var(--te-color-text-dim);
    font: inherit;
    cursor: pointer;
}

.te-app[data-mode="write-on"] .te-warning-dismiss:hover,
.te-app[data-mode="write-on"] .te-warning-dismiss:focus-visible {
    color: var(--te-color-accent);
}

/* ---- Inline indicators (issue #8; spec R-3.1 to R-3.5) ----
   Decoration classes come from public/js/indicators.js (TeIndicatorLayer);
   the dots and gutter rule live in the out-of-flow `.te-indicators`
   overlay beside the surface, so they never change line height. Every rule
   is scoped to Write_On mode: plain mode renders nothing. Design notes:
   docs/design/indicators.md */

.te-app[data-mode="write-on"] .te-indicator-host {
    --te-ind-dot: 3px;           /* dot diameter */
    --te-ind-dot-gap: 3px;       /* spacing ~ one diameter (R-3.2) */
    --te-ind-row-offset: 2px;    /* dot row below the text box */
    --te-ind-gutter: 1.25rem;    /* gutter rule distance from the text (video 2:00: ~20px) */
    position: relative;
}

/* R-3.1: thin muted underline under word and sentence spans, unchanged on
   hover. Paragraph spans get no underline (R-3.4). */
.te-app[data-mode="write-on"] .te-surface .te-ind-word,
.te-app[data-mode="write-on"] .te-surface .te-ind-sentence {
    text-decoration-line: underline;
    text-decoration-style: solid;
    text-decoration-thickness: 1px;
    text-decoration-color: var(--te-color-accent-soft);
    text-underline-offset: 2px;
    text-decoration-skip-ink: none;
}

/* R-3.5: headlines bold, same face and colour, slightly larger: every `#`
   line (te-heading, issue #84) and headline spans with alternatives. */
.te-app[data-mode="write-on"] .te-surface .te-heading,
.te-app:not([data-mode="write-on"]):not([data-tools="on"]) .te-surface .te-heading,
.te-app[data-mode="write-on"] .te-surface .te-ind-headline {
    font-weight: 700;
    font-size: 1.15em;
}

/* The `#` marker stays in the text but takes no space, so the heading is
   flush with the body; shown dimmed while the caret is on its line. */
.te-app[data-mode="write-on"] .te-surface .te-heading-marker,
.te-app:not([data-mode="write-on"]):not([data-tools="on"]) .te-surface .te-heading-marker {
    font-size: 0;
}

.te-app[data-mode="write-on"] .te-surface .te-heading-marker.te-heading-marker--shown,
.te-app:not([data-mode="write-on"]):not([data-tools="on"]) .te-surface .te-heading-marker.te-heading-marker--shown {
    font-size: 1.15em;
}

.te-app[data-mode="write-on"] .te-surface .te-heading-marker.te-heading-marker--shown:not(.te-ghost),
.te-app:not([data-mode="write-on"]):not([data-tools="on"]) .te-surface .te-heading-marker.te-heading-marker--shown:not(.te-ghost) {
    color: var(--te-color-text-dim);
}

.te-indicators {
    display: none;
}

.te-app[data-mode="write-on"] .te-indicators {
    display: block;
    position: absolute;
    inset: 0;
    overflow: visible;
    pointer-events: none;
    z-index: 1;
}

.te-app[data-mode="write-on"] .te-indicators [hidden] {
    display: none;
}

/* R-3.2: dot row; centred under a word, ending at the underline's right
   end for sentences and headlines. Left/top are set by the layer. */
.te-app[data-mode="write-on"] .te-ind-row {
    position: absolute;
    margin-top: var(--te-ind-row-offset);
}

.te-app[data-mode="write-on"] .te-ind-row--centre {
    transform: translateX(-50%);
}

.te-app[data-mode="write-on"] .te-ind-row--end {
    transform: translateX(-100%);
}

.te-app[data-mode="write-on"] .te-ind-dots,
.te-app[data-mode="write-on"] .te-ind-col {
    display: flex;
    gap: var(--te-ind-dot-gap);
}

.te-app[data-mode="write-on"] .te-ind-col {
    flex-direction: column;
}

/* R-3.3: dim dots at the soft accent; exactly one lit at the full accent
   (the 40% colour is below 3:1, see docs/design/indicators.md). */
.te-app[data-mode="write-on"] .te-ind-dot {
    display: block;
    flex: none;
    width: var(--te-ind-dot);
    height: var(--te-ind-dot);
    border-radius: 50%;
    background: var(--te-color-accent-soft);
    pointer-events: auto;
    cursor: default;
}

.te-app[data-mode="write-on"] .te-ind-dot--active {
    background: var(--te-color-accent);
}

/* R-3.4: paragraph rule in the left gutter spanning the paragraph, with a
   dot column immediately to its left, level with the rule's middle (the
   video at 2:00; docs/requirements/video-measurements.md). The holder is a
   zero-width box at the text's left edge; its height is the paragraph's. */
.te-app[data-mode="write-on"] .te-ind-para {
    position: absolute;
    width: 0;
}

.te-app[data-mode="write-on"] .te-ind-rule {
    position: absolute;
    top: 0;
    right: var(--te-ind-gutter);
    width: 1px;
    height: 100%;
    background: var(--te-color-accent-soft);
}

.te-app[data-mode="write-on"] .te-ind-para .te-ind-col {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    right: calc(var(--te-ind-gutter) + 1px + var(--te-ind-dot-gap));
}

/* Screen-reader descriptions referenced by aria-describedby. */
.te-ind-descriptions {
    position: absolute;
    width: 1px;
    height: 1px;
    margin: -1px;
    padding: 0;
    overflow: hidden;
    clip: rect(0 0 0 0);
    clip-path: inset(50%);
    white-space: nowrap;
    border: 0;
}