/* ==========================================================================
   Ringo — Ledger Reading Room
   See DESIGN.md. Tokens are declared once on :root and consumed everywhere.
   dark.css re-declares the same :root block and is loaded after this file.
   ========================================================================== */

:root {
    color-scheme: light;

    /* surfaces — warm paper, back to front */
    --ringo-paper-deep: #e4dece;
    --ringo-paper: #f2eee4;
    --ringo-paper-raised: #fbf9f4;
    --ringo-paper-sunken: #e9e3d5;

    /* ink */
    --ringo-ink: #1d3b34;
    --ringo-ink-strong: #0f231e;
    --ringo-ink-soft: #5d6b64;

    /* rules — structural hairlines (decorative, no contrast floor) */
    --ringo-rule: #ddd6c6;
    --ringo-rule-strong: #bfb49c;
    --ringo-rule-wash: rgba(29, 59, 52, 0.019);
    --ringo-fold: rgba(29, 59, 52, 0.05);

    /* field-border — boundaries of interactive controls, >= 3:1 on every paper */
    --ringo-field-border: #857b6b;

    /* accent — state that asks for action. Never decoration. */
    --ringo-accent: #b8503a;
    --ringo-accent-ink: #8f3a27;
    --ringo-accent-wash: #f3ded7;

    /* links */
    --ringo-link: #2c5c74;
    --ringo-link-hover: #8f3a27;

    /* band — the header spine */
    --ringo-band: #1d3b34;
    --ringo-band-raised: #2a5a50;
    --ringo-band-ink: #f2eee4;
    --ringo-band-ink-soft: #b9c7c0;
    --ringo-band-edge: #142a25;
    --ringo-band-wash: rgba(242, 238, 228, 0.045);

    /* search group sits on the band and needs its own face/edge pair */
    --ringo-search-face: #fbf9f4;
    --ringo-search-edge: #fbf9f4;

    /* focus — overridden inside the band, where accent falls under 3:1 */
    --ringo-focus: var(--ringo-accent);
    --ringo-focus-wash: var(--ringo-accent-wash);

    --ringo-space-1: 4px;
    --ringo-space-2: 8px;
    --ringo-space-3: 12px;
    --ringo-space-4: 16px;
    --ringo-space-5: 24px;
    --ringo-space-6: 32px;

    --ringo-radius: 3px;
    --ringo-band-height: 52px;
    --ringo-nav-height: 40px;
}

/* ==========================================================================
   1. base
   ========================================================================== */

html {
    background: var(--ringo-paper-deep);
}

body {
    font-family: 'SUIT', sans-serif;
    font-size: 14px;
    font-feature-settings: "ss18";
    line-height: 1.65;
    text-size-adjust: 100%;

    color: var(--ringo-ink);
    background: var(--ringo-paper-deep);

    margin: 0;
}

/* A rule under every level flattens six ranks into six identical bands. The
   base carries ink only; the ranking is in section 6, scoped to #main_data. */
h1, h2, h3, h4, h5, h6 {
    color: var(--ringo-ink-strong);
    line-height: 1.35;
    letter-spacing: -0.01em;
}

select {
    font-family: 'SUIT', sans-serif;
    font-feature-settings: "ss18";
}

textarea {
    font-family: 'SUIT', monospace;
    font-feature-settings: "ss18";
}

a {
    text-decoration: none;

    color: var(--ringo-link);
}

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

/* Global focus contract. Every interactive element keeps a visible ring;
   nothing in this skin is allowed to set `outline: none` on its own. */
a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
summary:focus-visible {
    outline: 2px solid var(--ringo-focus);
    outline-offset: 2px;
}

input, textarea, button, select {
    font-family: inherit;
    font-size: inherit;

    border: 1px solid var(--ringo-field-border);
    border-radius: var(--ringo-radius);

    padding: 10px;

    color: var(--ringo-ink-strong);
    background-color: var(--ringo-paper-raised);
}

.opennamu_main input,
.opennamu_main textarea {
    width: calc(100% - 22px);
}

/* Keyboard-only shortcut past the header band into the document body. */
.ringo_skip {
    position: absolute;
    left: -9999px;
    top: 0;

    z-index: 200;
}

.ringo_skip:focus {
    left: var(--ringo-space-3);
    top: var(--ringo-space-3);

    font-size: 13px;
    font-weight: 600;
    line-height: 1.5;

    color: var(--ringo-ink-strong);
    background: var(--ringo-paper-raised);

    border: 1px solid var(--ringo-ink);
    border-radius: var(--ringo-radius);

    padding: var(--ringo-space-2) var(--ringo-space-4);
}

/* ==========================================================================
   2. header band — the spine of the archive
   ========================================================================== */

header#main {
    display: flow-root;

    border-bottom: 1px solid var(--ringo-band-edge);

    line-height: var(--ringo-band-height);

    padding-left: 20px;
    padding-right: 20px;

    color: var(--ringo-band-ink);
    background-color: var(--ringo-band);
    background-image: repeating-linear-gradient(
        to bottom,
        transparent 0,
        transparent 31px,
        var(--ringo-band-wash) 31px,
        var(--ringo-band-wash) 32px
    );

    /* accent drops to 2.5:1 on the band, so the ring switches to paper here */
    --ringo-focus: var(--ringo-band-ink);
}

header#main a {
    color: var(--ringo-band-ink);
}

header#main span#right {
    float: right;

    display: flex;
    align-items: center;

    min-height: var(--ringo-band-height);
}

header a#logo {
    height: var(--ringo-band-height);

    display: inline-block;

    font-size: 17px;
    font-weight: 700;
    letter-spacing: -0.01em;

    padding-left: 20px;
    padding-right: 20px;

    margin-left: -20px;
}

/* The logo is admin-supplied HTML of unknown size. Cap it so the band keeps a
   fixed height instead of inheriting whatever was uploaded. */
header a#logo img {
    max-height: 36px;
    width: auto;

    vertical-align: middle;
}

header a#logo:hover {
    background-color: var(--ringo-band-raised);
}

/* ==========================================================================
   3. band menus
   ========================================================================== */

.top_cel {
    display: inline-block;
}

.top_cel_button {
    display: inline-block;

    height: var(--ringo-band-height);

    font-size: 13.5px;
    font-weight: 500;
    line-height: var(--ringo-band-height);
    letter-spacing: 0.01em;

    color: var(--ringo-band-ink);
    background-color: transparent;

    border: 0;
    border-radius: 0;

    padding-left: 10px;
    padding-right: 10px;

    cursor: pointer;

    transition: background-color 120ms ease-out, box-shadow 120ms ease-out;
}

.top_cel_button:hover,
.top_cel_button:focus-visible {
    color: var(--ringo-band-ink);
    background-color: var(--ringo-band-raised);

    box-shadow: inset 0 -2px 0 var(--ringo-band-ink);
}

.top_cel_button:focus-visible {
    outline: 2px solid var(--ringo-focus);
    outline-offset: -3px;
}

.top_cel_in {
    position: absolute;

    min-width: 210px;

    color: var(--ringo-ink);
    background: var(--ringo-paper-raised);

    border: 1px solid var(--ringo-field-border);
    border-radius: 0 0 var(--ringo-radius) var(--ringo-radius);

    line-height: initial;

    padding-top: var(--ringo-space-1);
    padding-bottom: var(--ringo-space-1);

    z-index: 120;
}

header#main .top_cel_in a {
    display: block;

    height: inherit;

    font-size: 13.5px;
    line-height: 1.5;

    color: var(--ringo-ink);

    padding: 9px 14px;

    transition: background-color 120ms ease-out, color 120ms ease-out;
}

header#main .top_cel_in a:hover,
header#main .top_cel_in a:focus-visible {
    color: var(--ringo-ink-strong);
    background-color: var(--ringo-paper-sunken);
}

header#main .top_cel_in a:focus-visible {
    outline: 2px solid var(--ringo-accent);
    outline-offset: -2px;
}

/* ==========================================================================
   4. search group — one paper slip laid on the band
   ========================================================================== */

header#main form.not_mobile {
    display: inline-flex;
    align-items: center;

    height: var(--ringo-band-height);

    vertical-align: top;

    margin: 0 0 0 var(--ringo-space-3);
}

.ringo_search_autocomplete_wrap {
    position: relative;

    display: block;
}

header#main form.not_mobile .ringo_search_autocomplete_wrap {
    display: flex;
    align-items: center;

    height: 36px;

    line-height: 0;
}

header#main form.not_mobile input.search {
    flex: none;

    display: block;

    width: 200px;
}

input.search {
    box-sizing: border-box;

    height: 36px;

    vertical-align: middle;

    font-size: 13.5px;
    line-height: 1.5;

    color: var(--ringo-ink-strong);
    background-color: var(--ringo-search-face);

    border: 1px solid var(--ringo-search-edge);
    border-right: 0;
    border-radius: var(--ringo-radius) 0 0 var(--ringo-radius);

    padding: 0 var(--ringo-space-3);
}

input.search::placeholder {
    color: var(--ringo-ink-soft);
    opacity: 1;
}

input.only_mobile.search {
    flex: 1 1 auto;

    width: auto;
    min-width: 0;
}

form.only_mobile .ringo_search_autocomplete_wrap {
    flex: 1 1 auto;

    min-width: 0;
}

.ringo_search_autocomplete {
    position: absolute;
    left: 0;
    top: calc(100% + var(--ringo-space-1));

    width: 100%;

    list-style: none;

    margin: 0;
    padding: var(--ringo-space-1) 0;

    color: var(--ringo-ink-strong);
    background-color: var(--ringo-paper-raised);

    border: 1px solid var(--ringo-field-border);
    border-radius: var(--ringo-radius);

    box-shadow: 0 6px 16px rgba(15, 35, 30, 0.2);

    max-height: 300px;
    overflow-y: auto;

    z-index: 140;
}

.ringo_search_autocomplete[hidden] {
    display: none;
}

.ringo_search_autocomplete_option {
    font-size: 13.5px;
    line-height: 1.5;
    word-break: keep-all;

    color: var(--ringo-ink-strong);

    padding: 8px var(--ringo-space-3);

    cursor: pointer;
}

.ringo_search_autocomplete_option.is_active,
.ringo_search_autocomplete_option:hover {
    color: var(--ringo-ink-strong);
    background-color: var(--ringo-paper-sunken);
}

input.search:focus-visible {
    outline: 2px solid var(--ringo-focus);
    outline-offset: 2px;

    position: relative;
    z-index: 1;
}

button.search_button {
    box-sizing: border-box;

    flex: none;

    width: 40px;
    height: 36px;

    vertical-align: middle;

    margin-left: 0;

    color: var(--ringo-ink);
    background-color: var(--ringo-search-face);

    border: 1px solid var(--ringo-search-edge);
    border-left: 1px solid var(--ringo-rule);
    border-radius: 0;

    padding: 0;

    font-size: 19px;

    line-height: 0px;

    cursor: pointer;

    transition: background-color 120ms ease-out, color 120ms ease-out;
}

button.search_button:hover {
    color: var(--ringo-accent-ink);
    background-color: var(--ringo-paper-sunken);
}

button.search_button:focus-visible {
    outline: 2px solid var(--ringo-focus);
    outline-offset: 2px;

    position: relative;
    z-index: 1;
}

button.search_button#goto {
    background-color: var(--ringo-search-face);
}

button.search_button#search {
    background-color: var(--ringo-search-face);

    border-radius: 0 var(--ringo-radius) var(--ringo-radius) 0;
}

button.search_button#goto:hover,
button.search_button#search:hover {
    background-color: var(--ringo-paper-sunken);
}

/* ==========================================================================
   5. document head — title, meta, action tabs
   ========================================================================== */

section {
    width: calc(100% - (250px + 40px));

    display: inline-block;

    vertical-align: top;

    border-left: 0px solid;

    color: var(--ringo-ink);
    background-color: var(--ringo-paper-raised);
}

header#section {
    padding-top: var(--ringo-space-5);
    padding-bottom: var(--ringo-space-5);

    border-bottom: 1px solid var(--ringo-rule);

    background-color: var(--ringo-paper);
    background-image: repeating-linear-gradient(
        to bottom,
        transparent 0,
        transparent 31px,
        var(--ringo-rule-wash) 31px,
        var(--ringo-rule-wash) 32px
    );
}

article.main {
    max-width: 1000px;

    padding-left: 20px;
    padding-right: 20px;

    margin: auto;
}

article.main#title {
    font-size: 12.5px;
    line-height: 1.6;

    color: var(--ringo-ink-soft);
}

article.main#title h1 {
    margin: 0;
    margin-bottom: var(--ringo-space-2);

    font-size: 32px;
    font-weight: 700;
    line-height: 1.25;
    letter-spacing: -0.02em;
    word-break: keep-all;

    color: var(--ringo-ink-strong);
}

article.main#title h1 sub {
    font-size: 15px;
    font-weight: 500;
    vertical-align: baseline;

    color: var(--ringo-ink-soft);
}

div#menu {
    display: flex;
    flex-wrap: wrap;
    gap: var(--ringo-space-1);

    margin-top: var(--ringo-space-4);
    margin-left: 0;
}

.menu_item_link {
    color: var(--ringo-ink);
    background-color: var(--ringo-paper-raised);

    border: 1px solid var(--ringo-field-border);
    border-radius: var(--ringo-radius);

    font-size: 13px;
    font-weight: 500;
    line-height: 1.5;
    white-space: nowrap;

    padding: 7px 13px;

    display: inline-block;

    margin-left: 0;

    transition: background-color 120ms ease-out, border-color 120ms ease-out, color 120ms ease-out;
}

.menu_item_link:hover,
.menu_item_link:focus-visible {
    color: var(--ringo-ink-strong);
    background-color: var(--ringo-paper-sunken);
    border-color: var(--ringo-ink-soft);
}

/* Despite the name, route/view_w.py sets this id from menu_data[2] for four
   unrelated states: edit permission, open discussion, existing ACL row, and
   watchlist. Several tabs can carry it at once, so it is a left band and not
   a fill. */
#topic_color {
    color: var(--ringo-accent-ink);
    background-color: var(--ringo-paper-raised);
    border-color: var(--ringo-accent);

    box-shadow: inset 2px 0 0 var(--ringo-accent);

    padding-left: 15px;
}

#topic_color:hover,
#topic_color:focus-visible {
    color: var(--ringo-accent-ink);
    background-color: var(--ringo-accent-wash);
    border-color: var(--ringo-accent);
}

/* ==========================================================================
   6. document body
   ========================================================================== */

article.main#main_data {
    padding-top: var(--ringo-space-5);
    padding-bottom: var(--ringo-space-2);

    min-height: 400px;
}

/* Rendered headings arrive with browser defaults, which put h5 and h6 below
   body size. Size and weight carry the rank; only h2 keeps a rule, because it
   is the only level that opens a new section of the page. */
#main_data h2,
#main_data h3,
#main_data h4,
#main_data h5,
#main_data h6 {
    word-break: keep-all;

    margin-top: var(--ringo-space-6);
    margin-bottom: var(--ringo-space-3);
}

#main_data h2 {
    font-size: 24px;
    font-weight: 700;
    letter-spacing: -0.015em;

    border-bottom: 1px solid var(--ringo-rule-strong);

    padding-bottom: var(--ringo-space-2);
}

#main_data h3 {
    font-size: 20px;
    font-weight: 700;
}

#main_data h4 {
    font-size: 17px;
    font-weight: 600;
}

#main_data h5 {
    font-size: 15px;
    font-weight: 600;

    margin-top: var(--ringo-space-5);
}

#main_data h6 {
    font-size: 13.5px;
    font-weight: 600;
    letter-spacing: 0.01em;

    color: var(--ringo-ink-soft);

    margin-top: var(--ringo-space-5);
}

#main_data button:hover {
    color: var(--ringo-ink-strong);
    background-color: var(--ringo-paper-sunken);

    cursor: pointer;
}

#main_data #opennamu_save_button {
    color: var(--ringo-paper-raised);
    background: var(--ringo-ink);
    border-color: var(--ringo-ink);
}

#main_data #opennamu_save_button:hover {
    color: var(--ringo-paper-raised);
    background: var(--ringo-ink-strong);
    border-color: var(--ringo-ink-strong);
}

pre#syntax, pre#syntax code {
    border: 0;
}

/* Rendered wiki markup ships its own stylesheet (views/main_css/css/main.css),
   which loads before this file. Only the neutral chrome of that sheet is
   retinted here — the semantic colours (diff, comment, blind) are left alone. */
#main_data .opennamu_main .opennamu_TOC,
#main_data .opennamu_main .opennamu_category,
#main_data .opennamu_main .opennamu_trace,
#main_data .opennamu_main .opennamu_redirect {
    background: var(--ringo-paper);

    border: 1px solid var(--ringo-rule-strong);
    border-radius: var(--ringo-radius);
}

#main_data .opennamu_main .opennamu_TOC_title {
    font-weight: 700;

    color: var(--ringo-ink-strong);
}

#main_data .opennamu_main table,
#main_data .opennamu_main td {
    border-color: var(--ringo-rule-strong);
}

#main_data .opennamu_main hr {
    border-top-color: var(--ringo-rule);
}

#main_data .opennamu_main blockquote {
    border: 1px solid var(--ringo-rule-strong);
    border-left: 3px solid var(--ringo-ink);
    border-radius: 0 var(--ringo-radius) var(--ringo-radius) 0;
}

#main_data .opennamu_main code,
#main_data .opennamu_main pre {
    color: var(--ringo-ink-strong);
    background-color: var(--ringo-paper-sunken);

    border-color: var(--ringo-rule-strong);
}

#main_data .opennamu_main s,
#main_data .opennamu_main del,
#main_data .opennamu_main .opennamu_history_blind {
    background: var(--ringo-rule);
}

#main_data .opennamu_main details summary {
    color: var(--ringo-ink-strong);

    cursor: pointer;
}

/* ==========================================================================
   7. sidebar — the card index column
   ========================================================================== */

aside {
    width: 250px;

    display: block;

    padding-top: 20px;
    padding-left: 20px;
    padding-right: 20px;
    padding-bottom: 20px;

    color: var(--ringo-ink);
    background-color: var(--ringo-paper-sunken);

    /* inset instead of border: the sibling <section> width is a hard calc() */
    box-shadow:
        inset 1px 0 0 var(--ringo-rule),
        inset -1px 0 0 var(--ringo-rule);

    min-height: calc(100vh - (50px + 12px));
}

.do_fixed {
    float: left;
}


.ringo_side_section {
    background: var(--ringo-paper-raised);

    border: 1px solid var(--ringo-rule-strong);
    border-radius: var(--ringo-radius);

    box-shadow: 0 1px 0 var(--ringo-rule);

    overflow: hidden;
}

.ringo_side_section + .ringo_side_section {
    margin-top: var(--ringo-space-3);
}

.ringo_side_heading {
    margin: 0;

    font-size: 12px;
    font-weight: 700;
    line-height: 1.5;
    letter-spacing: 0.01em;
    word-break: keep-all;

    color: var(--ringo-ink-strong);

    background: var(--ringo-paper);

    border-bottom: 1px solid var(--ringo-rule);

    padding: var(--ringo-space-2) var(--ringo-space-3);
}

#side_recent_section .ringo_side_heading {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--ringo-space-2);
}

#side_recent_section .ringo_side_heading_label {
    min-width: 0;
}

#side_recent_section .ringo_side_heading_more {
    flex: none;

    display: inline-flex;
    align-items: center;
    justify-content: center;

    min-width: 16px;
    height: 16px;

    color: var(--ringo-link);

    border: 1px solid transparent;
    border-radius: var(--ringo-radius);

    padding: 0 var(--ringo-space-1);

    line-height: 1;
    text-decoration: none;
}

#side_recent_section .ringo_side_heading_more:hover {
    color: var(--ringo-link-hover);
}

.ringo_side_heading + [role="status"] {
    padding: var(--ringo-space-2) var(--ringo-space-3) 0;
}

.ringo_side_content {
    margin-top: 0;

    padding: var(--ringo-space-2) var(--ringo-space-3) var(--ringo-space-2);

    font-size: 12.5px;
    line-height: 1.55;
    word-break: keep-all;

    color: var(--ringo-ink-soft);
}

.ringo_side_list {
    list-style: none;

    margin: 0;
    padding: 0;
}

.ringo_side_item {
    border-top: 1px solid var(--ringo-rule);

    padding-top: 6px;
    padding-bottom: 6px;
}

.ringo_side_item:first-child {
    border-top: 0;
    padding-top: 0;
}

.ringo_side_item a {
    display: block;

    font-weight: 500;
    line-height: 1.45;
    word-break: keep-all;

    color: var(--ringo-ink-strong);
}

#side_weekly_section .ringo_side_item {
    display: flex;
    align-items: baseline;
    gap: var(--ringo-space-2);
}

#side_weekly_section .ringo_side_rank {
    flex: none;

    min-width: 2ch;
    width: 2ch;

    font-size: 11.5px;
    line-height: 1.45;
    font-variant-numeric: tabular-nums;
    text-align: right;

    color: var(--ringo-ink-soft);
}

#side_weekly_section .ringo_side_item a {
    flex: 1 1 auto;
    min-width: 0;
}

.ringo_side_item a:hover {
    color: var(--ringo-accent-ink);
}

.ringo_side_meta {
    display: block;

    margin-top: var(--ringo-space-1);

    font-size: 11.5px;
    line-height: 1.45;

    color: var(--ringo-ink-soft);
}

.ringo_side_status {
    margin: 0;

    font-size: 12px;
    line-height: 1.5;

    color: var(--ringo-ink-soft);
    word-break: keep-all;
}

#side_recent_section .ringo_side_item {
    display: flex;
    align-items: baseline;
    gap: var(--ringo-space-2);
}

#side_recent_section .ringo_side_item a {
    flex: 1 1 auto;
    min-width: 0;
}

#side_recent_section .ringo_side_meta {
    flex: none;

    margin-top: 0;

    text-align: right;
    white-space: nowrap;
}

/* ==========================================================================
   8. footer
   ========================================================================== */

footer {
    border-top: 1px solid var(--ringo-rule);

    margin-top: var(--ringo-space-6);

    color: var(--ringo-ink-soft);
    background: var(--ringo-paper-sunken);

    padding: var(--ringo-space-6) 20px;

    font-size: 12.5px;
    line-height: 1.7;
}

/* #nav_bar is fixed to the bottom-right corner and overlaps whatever ends the
   page. Only the mobile footer ends the page, so the clearance lives here. */
footer.only_mobile {
    margin-top: 0px;

    padding-bottom: calc(var(--ringo-space-6) + var(--ringo-nav-height));
}

#b_logo {
    width: 100px;

    opacity: 0.72;

    transition: opacity 120ms ease-out;
}

a:hover #b_logo {
    opacity: 1;
}

/* ==========================================================================
   9. fixed navigation — the index tab clipped to the page corner
   ========================================================================== */

#nav_bar {
    z-index: 100;

    font-size: 20px;

    position: fixed;
    bottom: 0;
    right: 0;

    color: var(--ringo-ink);
    background: var(--ringo-paper-raised);

    border: 1px solid var(--ringo-field-border);
    border-right: 0;
    border-bottom: 0;
    border-radius: var(--ringo-radius) 0 0 0;

    text-align: center;
}

#go_top,
#go_bottom,
#go_toc {
    display: inline-block;

    padding: 0;

    width: auto;
}

#nav_bar a {
    display: flex;

    width: 44px;
    height: var(--ringo-nav-height);

    align-items: center;
    justify-content: center;

    color: var(--ringo-ink);

    transition: background-color 120ms ease-out, color 120ms ease-out;
}

#go_bottom a,
#go_toc a {
    border-left: 1px solid var(--ringo-rule);
}

#nav_bar a:hover {
    color: var(--ringo-accent-ink);
    background: var(--ringo-paper-sunken);
}

#nav_bar a:focus-visible {
    outline: 2px solid var(--ringo-accent);
    outline-offset: -2px;
}

.only_mobile, header#main form.only_mobile {
    display: none;
}

/* ==========================================================================
   10. responsive
   1000px  — layout switch: sidebar unstacks, band collapses to icons
    768px  — tablet density
    480px  — phone density
   ========================================================================== */

@media screen and (max-width: 1000px) {
    aside {
        border-top: 0px solid;

        width: calc(100vw - 40px);
        height: 100%;

        min-height: 0;

        padding: 20px;

        box-shadow:
            inset 0 1px 0 var(--ringo-rule),
            inset 0 -1px 0 var(--ringo-rule);
    }

    section {
        width: 100vw;

        padding-bottom: 20px;

        border-left: 0;
    }

    .not_mobile, header#main form.not_mobile {
        display: none;
    }

    .only_mobile, header#main form.only_mobile {
        display: block;
    }

    /* flex makes this a BFC, which shrinks beside the floated span#right
       instead of dropping below it. `clear` is load-bearing, not cosmetic. */
    header#main form.only_mobile {
        display: flex;
        align-items: center;

        clear: both;

        border-top: 1px solid var(--ringo-band-edge);

        padding-top: var(--ringo-space-3);
        padding-bottom: var(--ringo-space-3);

        line-height: 1;
    }

    .top_cel_in {
        left: 0;

        width: 100%;
        min-width: 0;

        border-left: 0;
        border-right: 0;
        border-radius: 0;

        /* full-width panels hang off the bottom of a phone screen, putting the
           last entries out of reach. dvh repeats the ceiling for browsers whose
           toolbars make vh taller than the visible page. */
        max-height: calc(100vh - var(--ringo-band-height) - var(--ringo-space-6));
        max-height: calc(100dvh - var(--ringo-band-height) - var(--ringo-space-6));

        overflow-y: auto;
        overscroll-behavior: contain;
    }

    /* float must be cleared on .do_fixed, not on aside: `aside` is (0,0,1)
       and loses to the `.do_fixed { float: left }` rule above. */
    .do_fixed {
        position: inherit;

        float: none;

        margin-bottom: 20px;
    }
}

@media screen and (max-width: 768px) {
    header#main {
        padding-left: var(--ringo-space-4);
        padding-right: var(--ringo-space-4);
    }

    header a#logo {
        padding-left: var(--ringo-space-4);
        padding-right: var(--ringo-space-4);

        margin-left: calc(var(--ringo-space-4) * -1);
    }

    header#section {
        padding-top: var(--ringo-space-4);
        padding-bottom: var(--ringo-space-4);
    }

    article.main {
        padding-left: var(--ringo-space-4);
        padding-right: var(--ringo-space-4);
    }

    article.main#title h1 {
        font-size: 27px;
    }

    article.main#main_data {
        padding-top: var(--ringo-space-4);
    }

    aside {
        width: calc(100vw - (var(--ringo-space-4) * 2));

        padding: var(--ringo-space-4);
    }

    footer {
        margin-top: var(--ringo-space-5);

        padding: var(--ringo-space-5) var(--ringo-space-4);
    }
}

@media screen and (max-width: 480px) {
    :root {
        --ringo-band-height: 46px;
        --ringo-nav-height: 38px;
    }

    header a#logo img {
        max-height: 30px;
    }

    .top_cel_button {
        padding-left: var(--ringo-space-2);
        padding-right: var(--ringo-space-2);
    }

    article.main#title h1 {
        font-size: 23px;
    }

    div#menu {
        margin-top: var(--ringo-space-3);
    }

    .menu_item_link {
        font-size: 12.5px;

        padding: 6px 10px;
    }

    #nav_bar a {
        width: 40px;
    }

    #nav_bar {
        font-size: 18px;
    }

    /* side by side, the two policy phrases break mid-word at this width.
       Stacking keeps each on one line and each underline the width of its own
       text instead of the whole column. */
    .ringo_policy_nav {
        flex-direction: column;
        align-items: flex-start;

        gap: var(--ringo-space-2) 0;
    }

    footer.only_mobile .ringo_policy_nav {
        width: 100%;
        min-width: 0;
        box-sizing: border-box;
    }
}

/* ==========================================================================
   11. ringo auth — scoped presentation layer for /login and /register
   Selectors are emitted by route/login_login.py and route/login_register.py.
   Do not rename them here without changing those routes.
   ========================================================================== */

.ringo_auth {
    max-width: 420px;

    margin-top: var(--ringo-space-2);
    margin-bottom: var(--ringo-space-5);
}

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

.ringo_auth_card {
    position: relative;

    background-color: var(--ringo-paper-raised);
    background-image: repeating-linear-gradient(
        to bottom,
        transparent 0,
        transparent 31px,
        var(--ringo-rule-wash) 31px,
        var(--ringo-rule-wash) 32px
    );

    border: 1px solid var(--ringo-rule-strong);
    border-radius: var(--ringo-radius);

    box-shadow: 0 1px 0 var(--ringo-rule);

    padding: var(--ringo-space-5) var(--ringo-space-5) var(--ringo-space-5) 40px;

    color: var(--ringo-ink);
}

/* ledger margin crease */
.ringo_auth_card::before {
    content: "";

    position: absolute;
    left: 24px;
    top: 0;
    bottom: 0;

    width: 1px;

    background: var(--ringo-fold);
}

.ringo_auth_eyebrow {
    display: flex;
    align-items: center;
    gap: var(--ringo-space-2);

    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.14em;
    line-height: 1.4;

    color: var(--ringo-accent);

    margin-bottom: var(--ringo-space-5);
}

.ringo_auth_eyebrow::before {
    content: "";

    width: 16px;
    height: 2px;

    background: var(--ringo-accent);

    flex: none;
}

.ringo_auth_contract {
    background: var(--ringo-paper-sunken);

    border-left: 3px solid var(--ringo-rule-strong);
    border-radius: 0 var(--ringo-radius) var(--ringo-radius) 0;

    padding: var(--ringo-space-3) var(--ringo-space-4);

    font-size: 12.5px;
    line-height: 1.6;
    word-break: keep-all;

    color: var(--ringo-ink-soft);

    margin-bottom: var(--ringo-space-5);

    max-height: 220px;
    overflow-y: auto;
}

.ringo_auth_field {
    margin-bottom: var(--ringo-space-5);
}

.ringo_auth_label {
    display: block;

    font-size: 13px;
    font-weight: 600;
    letter-spacing: 0.01em;
    line-height: 1.5;

    color: var(--ringo-ink-strong);

    margin-bottom: var(--ringo-space-2);
}

#main_data .ringo_auth .ringo_auth_field input {
    display: block;

    width: 100%;

    font-family: inherit;
    font-size: 15px;
    line-height: 1.5;

    color: var(--ringo-ink-strong);
    background-color: var(--ringo-paper);

    border: 1px solid var(--ringo-field-border);
    border-radius: var(--ringo-radius);

    padding: 11px var(--ringo-space-3);

    transition: border-color 120ms ease-out, box-shadow 120ms ease-out, background-color 120ms ease-out;
}

#main_data .ringo_auth .ringo_auth_field input::placeholder {
    color: var(--ringo-ink-soft);
    opacity: 1;
}

#main_data .ringo_auth .ringo_auth_field input:hover {
    border-color: var(--ringo-ink-soft);
}

#main_data .ringo_auth .ringo_auth_field input:focus-visible {
    outline: 2px solid transparent;
    outline-offset: 2px;

    border-color: var(--ringo-accent);
    background-color: var(--ringo-paper-raised);

    box-shadow: 0 0 0 3px var(--ringo-accent-wash);
}

/* Chrome paints autofilled inputs with a hardcoded blue that ignores
   background-color. An inset shadow is the only way to restore the paper tone. */
.ringo_auth_field input:-webkit-autofill,
.ringo_auth_field input:-webkit-autofill:hover {
    -webkit-text-fill-color: var(--ringo-ink-strong);
    -webkit-box-shadow: 0 0 0 1000px var(--ringo-paper) inset;

    caret-color: var(--ringo-ink-strong);
}

.ringo_auth_field input:-webkit-autofill:focus-visible {
    -webkit-box-shadow: 0 0 0 1000px var(--ringo-paper-raised) inset, 0 0 0 3px var(--ringo-accent-wash);
}

.ringo_auth_hint {
    display: block;

    font-size: 12.5px;
    line-height: 1.6;
    word-break: keep-all;

    color: var(--ringo-ink-soft);

    margin-top: var(--ringo-space-2);
}

/* captcha_get() may emit nothing, a v2/turnstile widget, or a hidden v3 input.
   It also appends its own <hr class="main_hr">, which this layer absorbs. */
.ringo_auth_captcha:empty {
    display: none;
}

.ringo_auth_captcha {
    margin-bottom: var(--ringo-space-5);
}

.ringo_auth .main_hr {
    display: none;
}

.ringo_auth_actions {
    border-top: 1px solid var(--ringo-rule);

    padding-top: var(--ringo-space-5);
}

#main_data .ringo_auth .ringo_auth_actions button {
    width: 100%;

    font-family: inherit;
    font-size: 15px;
    font-weight: 600;
    line-height: 1.5;

    color: var(--ringo-paper-raised);
    background-color: var(--ringo-ink);

    border: 1px solid var(--ringo-ink);
    border-radius: var(--ringo-radius);

    padding: 11px var(--ringo-space-4);

    cursor: pointer;

    transition: background-color 120ms ease-out, border-color 120ms ease-out, box-shadow 120ms ease-out;
}

#main_data .ringo_auth .ringo_auth_actions button:hover {
    color: var(--ringo-paper-raised);
    background-color: var(--ringo-ink-strong);
    border-color: var(--ringo-ink-strong);
}

#main_data .ringo_auth .ringo_auth_actions button:focus-visible {
    outline: 2px solid transparent;
    outline-offset: 2px;

    box-shadow: 0 0 0 3px var(--ringo-accent-wash), 0 0 0 4px var(--ringo-accent);
}

.ringo_auth_note {
    font-size: 12.5px;
    line-height: 1.6;
    word-break: keep-all;

    color: var(--ringo-ink-soft);

    margin-top: var(--ringo-space-4);
}

.ringo_auth_note:empty {
    display: none;
}

.ringo_auth_note #opennamu_http_warning_text:empty {
    display: none;
}

@media screen and (max-width: 420px) {
    .ringo_auth_card {
        padding: var(--ringo-space-4);
    }

    .ringo_auth_card::before {
        display: none;
    }
}

/* ==========================================================================
   12. footer policy navigation
   ========================================================================== */

.ringo_policy_nav {
    display: flex;
    flex-wrap: wrap;
    gap: 0 var(--ringo-space-5);

    margin-bottom: var(--ringo-space-4);
}

.ringo_policy_nav a {
    font-size: 13px;
    font-weight: 500;
    letter-spacing: 0.01em;
    line-height: 1.7;
    word-break: keep-all;

    color: var(--ringo-ink);

    border-bottom: 1px solid transparent;
}

.ringo_policy_nav a:hover {
    color: var(--ringo-accent);

    border-bottom-color: var(--ringo-accent);
}

.ringo_policy_nav a:focus-visible {
    outline: 2px solid var(--ringo-accent);
    outline-offset: 3px;

    border-radius: 2px;
}

/* ==========================================================================
   13. motion
   ========================================================================== */

@media (prefers-reduced-motion: reduce) {
    .top_cel_button,
    header#main .top_cel_in a,
    button.search_button,
    .menu_item_link,
    #nav_bar a,
    #b_logo,
    #main_data .ringo_auth .ringo_auth_field input,
    #main_data .ringo_auth .ringo_auth_actions button {
        transition: none;
    }
}