/* RAE — plain light stylesheet. Written from zero. */
:root {
    --rae-text: #1a1a1a;
    --rae-muted: #5f6368;
    --rae-bg: #ffffff;
    --rae-panel: #f6f7f9;
    --rae-border: #c9ced6;
    --rae-accent: #1f5fbf;
    --rae-accent-hover: #174a96;
    --rae-accent-text: #ffffff;
    --rae-error: #a61b1b;
    --rae-error-bg: #fdecec;
    --rae-disabled: #9aa0a6;
    --rae-gap: 12px;
    --rae-radius: 6px;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    font-size: 16px;
    line-height: 1.5;
    color: var(--rae-text);
    background: var(--rae-bg);
}

main {
    max-width: 720px;
    margin: 0 auto;
    padding: 24px;
}

h1 {
    margin: 0;
    font-size: 24px;
    font-weight: 600;
}

h2 {
    margin: 24px 0 6px;
    font-size: 18px;
    font-weight: 600;
}

header {
    display: flex;
    align-items: center;
    gap: var(--rae-gap);
    max-width: 720px;
    margin: 0 auto;
    padding: 16px 24px;
    border-bottom: 1px solid var(--rae-border);
}

header h1 {
    margin-right: auto;
}

#account-email {
    color: var(--rae-muted);
}

label {
    display: block;
    margin-bottom: 6px;
    color: var(--rae-muted);
}

input,
textarea {
    width: 100%;
    padding: 10px 12px;
    font-family: inherit;
    font-size: 16px;
    color: var(--rae-text);
    background: var(--rae-bg);
    border: 1px solid var(--rae-border);
    border-radius: var(--rae-radius);
}

input:focus,
textarea:focus {
    outline: 2px solid var(--rae-accent);
    outline-offset: 0;
}

button {
    padding: 10px 16px;
    font-family: inherit;
    font-size: 16px;
    color: var(--rae-accent-text);
    background: var(--rae-accent);
    border: 1px solid var(--rae-accent);
    border-radius: var(--rae-radius);
    cursor: pointer;
}

button:hover {
    background: var(--rae-accent-hover);
}

button:disabled {
    background: var(--rae-disabled);
    border-color: var(--rae-disabled);
    cursor: not-allowed;
}

header button {
    color: var(--rae-text);
    background: var(--rae-bg);
    border-color: var(--rae-border);
}

header button:hover {
    background: var(--rae-panel);
}

/* Login page */
.login-page {
    max-width: 360px;
    margin: 0 auto;
    padding: 48px 24px;
}

.login-page h1 {
    margin-bottom: 24px;
}

.login-page form > div {
    margin-bottom: var(--rae-gap);
}

#login-error:empty {
    display: none;
}

#login-error {
    margin-top: var(--rae-gap);
    padding: 10px 12px;
    color: var(--rae-error);
    background: var(--rae-error-bg);
    border-radius: var(--rae-radius);
}

/* Home page: classes the page script and markup use */
.ask-lab-note {
    color: var(--rae-muted);
}

.ask-lab-error {
    padding: 10px 12px;
    color: var(--rae-error);
    background: var(--rae-error-bg);
    border-radius: var(--rae-radius);
}

.ask-lab-answer {
    margin-top: 10px;
    padding: 10px 12px;
    background: var(--rae-panel);
    border: 1px solid var(--rae-border);
    border-radius: var(--rae-radius);
}

.ask-lab-option {
    display: block;
    width: 100%;
    margin-top: 6px;
    padding: 10px 12px;
    text-align: left;
    color: var(--rae-text);
    background: var(--rae-bg);
    border: 1px solid var(--rae-border);
    border-radius: var(--rae-radius);
}

.ask-lab-option:hover {
    background: var(--rae-panel);
}

/* Admin page: the users table and the new-tester form */
.admin-page form > div {
    margin-bottom: var(--rae-gap);
}

.admin-page form {
    margin: 24px 0;
}

#admin-error:empty {
    display: none;
}

#admin-error {
    margin-bottom: var(--rae-gap);
    padding: 10px 12px;
    color: var(--rae-error);
    background: var(--rae-error-bg);
    border-radius: var(--rae-radius);
}

table {
    width: 100%;
    border-collapse: collapse;
}

th,
td {
    padding: 8px 10px;
    text-align: left;
    border-bottom: 1px solid var(--rae-border);
}

th {
    color: var(--rae-muted);
    font-weight: 600;
}

td button {
    margin-right: 6px;
    padding: 4px 10px;
    font-size: 14px;
}

/* ==== Home page layout: header toggles, Teach / Ask columns (typography and layout only) ====
   Component class index (rae-<block>, rae-<block>__element, rae-<block>--modifier):
   rae-header      left, right (groups); brand, expert, clear, dirty, save | account, views, admin, logout (app bar)
   rae-segmented   input, label (the Teach / Both / Ask view control: native radios, one bar)
   rae-columns     rae-column, rae-column--teach, rae-column--ask (page layout)
   rae-button      --primary, --danger, --option, --quiet (every button)
   rae-teach       input, actions, progress, results, error, foot, dirty (Teach column)
   rae-result      --stored, --refused; head, number, sentence, detail, label, line, gap (taught-sentence rows)
   rae-rules       heading, empty (Rules list); rae-rule: head, number, sentence (each row)
   rae-rule        (draft -> publish) --draft, --edited, --removed; undo, remove, note, choice (block parts)
   rae-ask         form (stacked), question, error, picker, deciding, facts, answer (Ask column)
   rae-pick        label, others (RAE's pick); rae-ruleref: number, sentence (rule shown in a line)
   rae-option      --picked; number, sentence (picker option buttons); rae-more ("and N more")
   rae-deciding    label ("Deciding:" line)
   rae-field       label, input (fact form); rae-answer: head, statement, verdict, sentence, why, stop
   rae-input       --editor (normal field / text-editor field; rae-field__input shares the normal look)
   rae-note, rae-error, rae-signed-line   shared notes (signed-line = the five signed copy lines)
*/
.rae-header,
main.rae-columns {
    max-width: 1200px;
}

main.rae-columns {
    display: flex;
    gap: 24px;
    align-items: stretch;
}

main.rae-columns.rae-one {
    max-width: 720px;
}

.rae-header .rae-header__brand {
    margin-right: 0;
}

.rae-column {
    flex: 1 1 0;
    min-width: 0;
}

.rae-column--teach {
    flex-grow: 3;
}

.rae-column--ask {
    flex-grow: 2;
}

.rae-column[hidden] {
    display: none;
}

/* Auto-growing textarea: a hidden replica of the text sizes the grid cell */
.rae-grow {
    display: grid;
}

.rae-grow::after {
    content: attr(data-value) " ";
    white-space: pre-wrap;
    visibility: hidden;
}

.rae-grow > textarea,
.rae-grow::after {
    grid-area: 1 / 1 / 2 / 2;
    padding: 10px 12px;
    font: inherit;
    font-size: 16px;
    line-height: 1.5;
    border: 1px solid var(--rae-border);
    overflow-wrap: anywhere;
}

.rae-grow > textarea {
    overflow: hidden;
    resize: none;
    min-height: calc(3 * 1.5em + 22px);
}

/* Rules list: printed-document feel (numbers in a narrow left margin) */
.rae-rules {
    line-height: 1.6;
}

.rae-rules .rae-rule {
    margin-top: 6px;
    padding: 0;
    background: none;
    border: 0;
    border-radius: 0;
}

.rae-rules .rae-rule__head {
    display: flex;
}

.rae-rules .rae-rule__number {
    flex: none;
    width: 3em;
    margin-right: 0;
    font-family: inherit;
    font-size: 14px;
    font-weight: 400;
    color: var(--rae-muted);
    font-variant-numeric: tabular-nums;
}

.rae-rules .rae-rule__sentence {
    flex: 1 1 0;
    min-width: 0;
}

/* Foot of the Teach column: set apart by whitespace only */
.rae-teach__foot {
    margin-top: 48px;
    padding-top: 24px;
}

/* Draft -> publish: blocks of the Rules document (typography and spacing only) */
.rae-rules .rae-rule__sentence {
    flex: 1 1 0;
    min-width: 0;
}

/* Foot of the Teach column: set apart by whitespace only */
.rae-teach__foot {
    margin-top: 48px;
    padding-top: 24px;
}

/* Draft -> publish: blocks of the Rules document (typography and spacing only) */
.rae-teach__actions {
    align-items: center;
}

.rae-teach__actions [hidden] {
    display: none;
}

.rae-rules .rae-rule__sentence {
    white-space: pre-wrap;
    overflow-wrap: anywhere;
}

.rae-rules .rae-rule--removed .rae-rule__sentence {
    text-decoration: line-through;
    color: var(--rae-muted);
}

.rae-rules .rae-rule__remove,
.rae-rules .rae-rule__undo {
    flex: none;
    margin-left: 8px;
    padding: 2px 8px;
    font-size: 14px;
    color: var(--rae-muted);
    background: none;
    border-color: transparent;
}

.rae-rules .rae-rule__remove {
    padding: 2px 4px;
    line-height: 0;
}

.rae-rules .rae-rule__remove svg {
    display: block;
}

.rae-rules .rae-rule__remove:hover:not(:disabled),
.rae-rules .rae-rule__undo:hover:not(:disabled) {
    color: var(--rae-text);
    background: none;
}

.rae-rules .rae-rule__remove:disabled,
.rae-rules .rae-rule__undo:disabled {
    color: var(--rae-disabled);
    background: none;
    border-color: transparent;
}

.rae-rules .rae-rule__note,
.rae-rules .rae-rule__choice {
    margin: 2px 0 0 3em;
    font-size: 14px;
}

.rae-rules .rae-rule__choice button {
    margin-left: 8px;
    padding: 2px 10px;
    font-size: 14px;
}

/* Header controls: Clear expert (text button), Unsaved changes, Save */
.rae-header [hidden] {
    display: none;
}

header .rae-header__clear {
    padding: 4px 8px;
    color: var(--rae-error);
    background: none;
    border-color: transparent;
}

header .rae-header__clear:hover:not(:disabled) {
    background: none;
    text-decoration: underline;
}

header .rae-header__clear:disabled {
    color: var(--rae-disabled);
    background: none;
    border-color: transparent;
}

header .rae-header__save {
    color: var(--rae-accent-text);
    background: var(--rae-accent);
    border-color: var(--rae-accent);
}

header .rae-header__save:hover:not(:disabled) {
    background: var(--rae-accent-hover);
}

header .rae-header__save:disabled {
    background: var(--rae-disabled);
    border-color: var(--rae-disabled);
}

/* Field classes. rae-input: the normal field (visible border, padding, normal focus outline); the ask facts inputs
   are built by the page script with rae-field__input and look the same. rae-input--editor: text-editor style for the
   teach side (the teach box and every rule sentence): no border, no padding, transparent, no focus outline, the
   same font, size and line height as the rule text, so viewing and editing look the same. */
.rae-input,
.rae-field__input {
    padding: 10px 12px;
    font-family: inherit;
    font-size: 16px;
    color: var(--rae-text);
    background: var(--rae-bg);
    border: 1px solid var(--rae-border);
    border-radius: var(--rae-radius);
}

.rae-input:focus,
.rae-field__input:focus {
    outline: 2px solid var(--rae-accent);
    outline-offset: 0;
}

.rae-input.rae-input--editor {
    padding: 0;
    font: inherit;
    font-size: 16px;
    line-height: 1.6;
    background: transparent;
    border: 0;
    border-radius: 0;
}

.rae-input.rae-input--editor:focus {
    outline: none;
}

.rae-grow > textarea.rae-input--editor {
    min-height: calc(3 * 1.6em);
}

.rae-teach__input.rae-grow::after {
    padding: 0;
    line-height: 1.6;
    border: 0;
}

/* Header groups: left (RAE, expert, Clear expert, Unsaved changes, Save) and right (email, toggles, Admin, Log out) */
.rae-header {
    justify-content: space-between;
}

.rae-header__left,
.rae-header__right {
    display: flex;
    align-items: center;
    gap: var(--rae-gap);
}

/* Fixed header: stays at the top while the page scrolls (the page scrolls, the columns are not panes) */
.rae-header {
    position: sticky;
    top: 0;
    z-index: 10;
    background: var(--rae-bg);
}

/* Column rule: with both columns open, the ask column's left edge is a 1px vertical rule (longhands); the columns
   start below main's top padding, so the rule does not touch the header until the page scrolls */
.rae-column--ask {
    padding-left: 24px;
    border-left-width: 1px;
    border-left-style: solid;
    border-left-color: var(--rae-border);
}

main.rae-columns.rae-one .rae-column--ask {
    padding-left: 0;
    border-left-style: none;
}

/* Ask form: the Ask button sits below the question field, left-aligned */
.rae-ask__form {
    flex-direction: column;
    align-items: flex-start;
}

.rae-ask__form .rae-ask__question {
    flex: none;
    align-self: stretch;
}

/* View control: a segmented bar built from native radios (visually hidden, still focusable) */
.rae-segmented {
    display: inline-flex;
    position: relative;
    border-width: 1px;
    border-style: solid;
    border-color: var(--rae-border);
    border-radius: var(--rae-radius);
    overflow: hidden;
}

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

.rae-segmented__label {
    display: block;
    margin: 0;
    padding: 4px 12px;
    font-size: 14px;
    line-height: 1.5;
    color: var(--rae-text);
    background: var(--rae-bg);
    cursor: pointer;
}

.rae-segmented__input + .rae-segmented__label ~ .rae-segmented__input + .rae-segmented__label {
    border-left-width: 1px;
    border-left-style: solid;
    border-left-color: var(--rae-border);
}

.rae-segmented__input:checked + .rae-segmented__label {
    color: var(--rae-accent-text);
    background: var(--rae-accent);
}

.rae-segmented__input:focus-visible + .rae-segmented__label {
    outline: 2px solid var(--rae-accent);
    outline-offset: -2px;
}