:root {
    --color-bg: #fff;
    --color-bg-alt: #fafaff;
    --color-bg-alt2: #f3f3fb;
    --color-bg-muted: #f2f2f2;
    --color-bg-stripe: #f4f4f4;
    --color-bg-stripe-alt: #fbfbfb;
    --color-bg-highlight: #fffaa0;
    --color-bg-target: #fff8d6;
    --color-bg-menu: #eef;
    --color-bg-menu2: #def;
    --color-bg-menu2-hover: #cde;
    --color-bg-shortcut-hover: #fee;

    --color-text: #222;
    --color-text-muted: #444;
    --color-text-muted-2: #555;
    --color-text-muted-3: #666;
    --color-text-muted-4: #777;
    --color-text-muted-5: #888;
    --color-text-icon: #999;

    --color-link: #225;
    --color-accent: #c33;
    --color-accent-contrast: #fff;
    --color-tag-bg: #338;

    --color-border: #ccc;
    --color-border-light: #eee;
    --color-border-dashed: #ddd;
    --color-border-session: #cce;
    --color-border-session-hover: #99b;
    --color-border-interval: #bbb;

    --color-fab-bg: rgba(34, 34, 85, 0.45);
    --color-fab-bg-hover: rgba(34, 34, 85, 0.7);
    --color-shadow: rgba(0, 0, 0, 0.2);
}

@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        --color-bg: #16171d;
        --color-bg-alt: #1e2029;
        --color-bg-alt2: #262838;
        --color-bg-muted: #24262d;
        --color-bg-stripe: #20222b;
        --color-bg-stripe-alt: #1b1c23;
        --color-bg-highlight: #4a4420;
        --color-bg-target: #3a3620;
        --color-bg-menu: #22263a;
        --color-bg-menu2: #1d2233;
        --color-bg-menu2-hover: #2a3050;
        --color-bg-shortcut-hover: #3a2020;

        --color-text: #e4e4e8;
        --color-text-muted: #b8b8c0;
        --color-text-muted-2: #a8a8b2;
        --color-text-muted-3: #9a9aa4;
        --color-text-muted-4: #888c96;
        --color-text-muted-5: #7a7d87;
        --color-text-icon: #6a6d78;

        --color-link: #8ab4f8;
        --color-accent: #e05a5a;
        --color-accent-contrast: #fff;
        --color-tag-bg: #4a6fa8;

        --color-border: #33353f;
        --color-border-light: #2a2c35;
        --color-border-dashed: #3a3c46;
        --color-border-session: #3a3f5c;
        --color-border-session-hover: #4d5378;
        --color-border-interval: #45474f;

        --color-fab-bg: rgba(180, 190, 255, 0.35);
        --color-fab-bg-hover: rgba(180, 190, 255, 0.55);
        --color-shadow: rgba(0, 0, 0, 0.5);
    }
}

:root[data-theme="dark"] {
    --color-bg: #16171d;
    --color-bg-alt: #1e2029;
    --color-bg-alt2: #262838;
    --color-bg-muted: #24262d;
    --color-bg-stripe: #20222b;
    --color-bg-stripe-alt: #1b1c23;
    --color-bg-highlight: #4a4420;
    --color-bg-target: #3a3620;
    --color-bg-menu: #22263a;
    --color-bg-menu2: #1d2233;
    --color-bg-menu2-hover: #2a3050;
    --color-bg-shortcut-hover: #3a2020;

    --color-text: #e4e4e8;
    --color-text-muted: #b8b8c0;
    --color-text-muted-2: #a8a8b2;
    --color-text-muted-3: #9a9aa4;
    --color-text-muted-4: #888c96;
    --color-text-muted-5: #7a7d87;
    --color-text-icon: #6a6d78;

    --color-link: #8ab4f8;
    --color-accent: #e05a5a;
    --color-accent-contrast: #fff;
    --color-tag-bg: #4a6fa8;

    --color-border: #33353f;
    --color-border-light: #2a2c35;
    --color-border-dashed: #3a3c46;
    --color-border-session: #3a3f5c;
    --color-border-session-hover: #4d5378;
    --color-border-interval: #45474f;

    --color-fab-bg: rgba(180, 190, 255, 0.35);
    --color-fab-bg-hover: rgba(180, 190, 255, 0.55);
    --color-shadow: rgba(0, 0, 0, 0.5);
}

body { font-family: Arial, Helvetica, sans-serif; margin: 0; color: var(--color-text); background: var(--color-bg); overflow-wrap: break-word; word-wrap: break-word; }

#fab_search { display: none; }

#fab_top {
    display: flex;
    align-items: center;
    justify-content: center;
    position: fixed;
    left: 50%;
    bottom: 16px;
    transform: translateX(-50%);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--color-fab-bg);
    color: #fff;
    font-size: 18px;
    text-decoration: none;
    box-shadow: 0 2px 8px var(--color-shadow);
    z-index: 20;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease;
}
#fab_top.visible { opacity: 1; pointer-events: auto; }
#fab_top:hover { background: var(--color-fab-bg-hover); }
.page_table { width: 100%; border-collapse: collapse; }
.central_td_column { padding: 16px 24px; }

#header { position: relative; display: flex; align-items: center; gap: 12px; padding: 8px 0; border-bottom: 1px solid var(--color-border); }
#header .event_logo { max-height: 75px; width: auto; flex: 0 0 auto; }
#header #title { font-size: 22px; font-weight: bold; padding: 0; border: none; }
#title { font-size: 22px; font-weight: bold; padding: 8px 0; border-bottom: 1px solid var(--color-border); }

.header_fabs { position: absolute; top: 18px; right: 20px; display: flex; align-items: center; gap: 8px; }

.header_fab {
    width: 44px;
    height: 44px;
    padding: 0;
    background: var(--color-bg);
    color: var(--color-text);
    border: 1px solid var(--color-border);
    border-radius: 50%;
    cursor: pointer;
    font-size: 20px;
    box-shadow: 0 2px 8px var(--color-shadow);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
}
.header_fab:hover { transform: scale(1.1); box-shadow: 0 4px 12px var(--color-shadow); }

#main_menu { display: flex; flex-wrap: wrap; gap: 8px; padding: 10px 0; border-bottom: 1px solid var(--color-border-light); }
#main_menu a { display: inline-block; padding: 8px 18px; font-size: 15px; font-weight: 600; background: var(--color-bg-menu); color: var(--color-link); text-decoration: none; border-radius: 4px; text-transform: uppercase; }
#main_menu a.selected { background: var(--color-accent); color: var(--color-accent-contrast); }

#menu2, #menu3 { display: flex; flex-wrap: wrap; align-items: center; row-gap: 6px; column-gap: 7px; padding: 10px 0; font-size: 14px;border-bottom: 1px solid var(--color-border-light);}
#menu2 a, #menu3 a { display: inline-block; background: var(--color-bg-menu2); color: var(--color-link); text-decoration: none; white-space: nowrap; padding: 5px 12px; border-radius: 3px; }
#menu2 a:hover, #menu3 a:hover { background: var(--color-bg-menu2-hover); }
#menu2 a.selected, #menu3 a.selected { background: var(--color-accent); color: var(--color-accent-contrast); font-weight: bold; }
#menu2 a.selected:hover, #menu3 a.selected:hover { background: var(--color-accent); }
#menu2 .separator, #menu3 .separator { display: none; }

#pagetitle { position: sticky; top: 0; z-index: 11; background: var(--color-bg); font-size: 18px; line-height: 21px; font-weight: bold; padding: 12px 0 6px 0; }

.sticky_header { position: sticky; top: 0; z-index: 11; background: var(--color-bg); }
.sticky_header #pagetitle { position: static; }
.sticky_header .shortcuts { position: static; }

.author_function_legend { font-size: 12px; color: var(--color-text-muted-2); margin: 0 0 14px 0; }
.author_function_legend .author_function { margin: 0 2px 0 4px; }

.days_line { margin: 6px 0 14px 0; }
.days_line a { margin-right: 14px; color: var(--color-link); }
.days_line a.selected { font-weight: bold; color: var(--color-text); }
.day_icon { height: 14px; width: 14px; vertical-align: -2px; margin: 0 4px; }

.date { position: sticky; top: 39px; z-index: 10; background: var(--color-border-dashed); padding: 6px 10px; margin-top: 18px; margin-bottom: 12px; font-weight: bold; }

.session { border-left: 3px solid var(--color-border-session); padding: 8px 12px; margin: 8px 0; background: var(--color-bg-alt); scroll-margin-top: 80px; }
.session.subsession { margin-left: 28px; border-left-color: var(--color-border-session-hover); background: var(--color-bg-alt2); }
.session.interval_session { border-left-color: var(--color-border-interval); background: var(--color-bg-muted); }
.session.interval_session .title { font-weight: normal; color: var(--color-text-muted-3); }
.session .heading { margin-bottom: 4px; }
.favorite_btn { background: none; border: none; cursor: pointer; font-size: 22px; color: var(--color-text-muted-4); vertical-align: middle; margin-right: 6px; padding: 0; line-height: 1; }
.favorite_btn:hover { color: var(--color-accent); }
.favorite_btn.favorited { color: var(--color-accent); }

.skip_link { position: absolute; left: -9999px; top: 0; z-index: 100; background: var(--color-bg); color: var(--color-text); padding: 8px 16px; border: 1px solid var(--color-border); }
.skip_link:focus { left: 8px; top: 8px; }
.session .interval { font-weight: bold; color: var(--color-link); margin-right: 8px; }
.session .title { font-weight: bold; }
.session .group_tag { float: right; font-size: 11px; background: var(--color-tag-bg); color: var(--color-accent-contrast); padding: 2px 6px; border-radius: 3px; }

.session_chair, .room { font-size: 13px; color: var(--color-text-muted); margin: 2px 0; }
.session_chair .chair_word, .room .room_word { display: inline-block; min-width: 60px; font-weight: bold; }
.chair_names, .session_chair .chair_names { display: inline; }
a.room_name { color: var(--color-link); text-decoration: underline; }
a.room_name:hover { color: var(--color-accent); }

.session_desc { font-size: 13px; color: var(--color-text-muted-2); margin: 6px 0; }

.group_tiles { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 12px; margin-top: 10px; }
.group_tile { display: flex; flex-direction: column; gap: 4px; padding: 14px 16px; background: var(--color-bg-alt); border-left: 3px solid var(--color-border-session); text-decoration: none; color: inherit; }
.group_tile:hover { background: var(--color-bg-alt2); border-left-color: var(--color-border-session-hover); }
.group_tile_label { font-weight: bold; color: var(--color-link); }
.group_tile_count { font-size: 13px; color: var(--color-text-muted-2); }
.group_tile_dates { font-size: 12px; color: var(--color-text-muted-4); }

table.talks { width: 100%; margin-top: 6px; border-collapse: collapse; }
table.talks td { padding: 4px 8px; vertical-align: top; border-top: 1px dashed var(--color-border-dashed); }
table.talks td.time { width: 60px; font-size: 12px; font-weight: bold; color: var(--color-link); white-space: nowrap; }
.title .duration { display: inline-block; font-weight: normal; font-size: 11px; color: var(--color-tag-bg); background: var(--color-bg-menu); border-radius: 3px; padding: 1px 6px; margin-left: 6px; vertical-align: middle; }
.authors { font-size: 13px; color: var(--color-link); }
.authors sup { font-size: 10px; }
.authors sup.author_function { color: var(--color-accent); font-weight: bold; margin-left: 1px; cursor: help; }
.affiliations { font-size: 12px; color: var(--color-text-muted-3); font-style: italic; margin-top: 2px; word-wrap: break-word; overflow-wrap: break-word; }
.affiliation_item { display: inline; margin-right: 10px; }
.affiliation_item sup { font-size: 10px; margin-right: 1px; font-style: normal; }
a.person { color: var(--color-link); text-decoration: underline; }
a.person:hover { color: var(--color-accent); }
.title { font-weight: normal; margin-bottom: 6px; }
a.abstract_link { font-size: 12px; color: var(--color-tag-bg); text-decoration: none; margin-left: 4px; font-weight: normal; }
a.abstract_link:hover { color: var(--color-accent); text-decoration: underline; }
tr.talk { scroll-margin-top: 80px; }
tr.talk:target td { background: var(--color-bg-target); }
.abstract { margin: 6px 0 8px 0; padding: 6px 0; font-size: 13px; color: var(--color-text-muted); }
.abstract_label { font-weight: bold; }
.abstract_text { margin: 4px 0; }

.room_sessions_title { font-size: 16px; margin: 18px 0 8px 0; }
.room_sessions { list-style: disc; padding-left: 20px; margin: 8px 0; }
.room_sessions li { padding: 4px 0; }
.room_sessions .session_link { color: var(--color-link); text-decoration: underline; font-weight: bold; }
.room_sessions .session_link:hover { color: var(--color-accent); }
.room_sessions .session_meta { color: var(--color-text-muted-2); font-family: Consolas, "Courier New", monospace; font-size: 13px; margin-left: 6px; }
.room_sessions .group_tag { font-size: 11px; background: var(--color-tag-bg); color: var(--color-accent-contrast); padding: 2px 6px; border-radius: 3px; margin-left: 8px; }
.room_sessions_empty { color: var(--color-text-muted-5); font-style: italic; }

#disclaimer { margin-top: 30px; padding-top: 10px; border-top: 1px solid var(--color-border-light); font-size: 11px; color: var(--color-text-muted-5); }
#last_updated { display: block; margin-top: 2px; }

.shortcuts { padding: 8px 0; margin: 8px 0 16px 0; border-top: 1px solid var(--color-border-dashed); border-bottom: 1px solid var(--color-border-dashed); font-size: 14px; }
.shortcuts .links { margin-left: 8px; }
.shortcuts a { display: inline-block; min-width: 22px; padding: 2px 6px; margin: 2px; border: 1px solid var(--color-accent); color: var(--color-accent); text-decoration: none; text-align: center; }
.shortcuts a:hover { background: var(--color-bg-shortcut-hover); }

table.index { width: 100%; border-collapse: collapse; }
table.index tr.letter { scroll-margin-top: 90px; }
table.index tr.letter td { background: var(--color-bg-highlight); padding: 6px 10px; font-weight: bold; font-size: 16px; }
table.index tr.letter:target td { background: var(--color-accent); color: var(--color-accent-contrast); }
table.index tr.entry td { padding: 4px 10px; vertical-align: top; border-bottom: 1px solid var(--color-border-light); }
table.index td.name { width: 30%; }
table.index td.name a { color: var(--color-link); text-decoration: underline; }
table.index td.name .last_name { font-weight: bold; }
table.index td.papers { width: 70%; }
.paper_list .paper1 { padding: 2px 0; }
.paper_list .paper1.keyword_paper { padding-left: 14px; position: relative; }
.paper_list .paper1.keyword_paper::before { content: "\25A0"; color: var(--color-text-muted-2); position: absolute; left: 0; top: 2px; font-size: 10px; }
.ptitle .conference { display: inline-block; font-size: 12px; color: var(--color-tag-bg); margin-right: 4px; }
.ptitle .conference a { color: var(--color-tag-bg); }
.ptitle > a { color: var(--color-link); }
.index_intro { font-size: 13px; color: var(--color-text-muted); margin: 0 0 12px 0; }

table.bio_layout { width: 100%; border-collapse: collapse; margin-top: 8px; }
.bio_photo_cell { width: 140px; vertical-align: top; padding-right: 16px; }
.bio_main_cell { vertical-align: top; }
.bio_img img { width: 120px; height: auto; border: 1px solid var(--color-border-dashed); }
.bio_img_placeholder { width: 120px; height: 120px; line-height: 120px; text-align: center; font-size: 48px; color: var(--color-text-icon); border: 1px dashed var(--color-border); background: var(--color-bg-stripe); }
.bio_title { font-size: 22px; font-weight: bold; padding-bottom: 8px; border-bottom: 1px solid var(--color-border); margin-bottom: 8px; }
.bio_affiliations { width: 100%; border-collapse: collapse; margin: 8px 0; }
.bio_affiliations tr { background: var(--color-bg-stripe); border: 1px solid var(--color-border-dashed); }
.bio_affiliations tr:nth-child(even) { background: var(--color-bg-stripe-alt); }
.bio_affiliations td { padding: 6px 10px; border: 1px solid var(--color-border-dashed); font-size: 13px; }
.bio_affiliation_label { width: 110px; font-weight: bold; color: var(--color-text-muted); }
.bio_affiliation_value { color: var(--color-text); }
.bio_description { font-size: 13px; color: var(--color-text-muted); margin: 8px 0 16px 0; }
.bio_pages { font-weight: bold; margin-top: 12px; padding: 4px 0; }
.bio_table { width: 100%; border-collapse: collapse; margin-top: 4px; }
.bio_table td { padding: 4px 8px; }
.bio_table tr.evengrey td { background: var(--color-bg-stripe); }
.bio_table tr.oddgrey td { background: var(--color-bg); }
.bio_table tr.top td { border-top: 1px solid var(--color-border-dashed); }
.bio_table tr.bottom td { border-bottom: 1px solid var(--color-border-dashed); }
.bio_table a { color: var(--color-link); }

@media (max-width: 700px) {
    .page_table { table-layout: fixed; }
    .central_td_column { padding: 12px 12px 76px 12px; word-wrap: break-word; overflow-wrap: break-word; }

    #fab_search {
        display: flex;
        align-items: center;
        justify-content: center;
        position: fixed;
        right: 16px;
        bottom: 16px;
        width: 40px;
        height: 40px;
        border-radius: 50%;
        background: #ffffff;
        color: var(--color-link);
        font-size: 17px;
        text-decoration: none;
        box-shadow: 0 2px 8px var(--color-shadow);
        z-index: 20;
    }

    .group_tiles { grid-template-columns: 1fr; }

    #header { flex-wrap: wrap; }
    #header .event_logo { height: 60px; }
    #header #title, #title { font-size: 18px; }

    #main_menu a { padding: 6px 12px; margin-right: 4px; font-size: 14px; }
    #menu2, #menu3 { row-gap: 5px; column-gap: 6px; font-size: 13px; max-height: 25vh; overflow-y: auto; box-shadow: inset 0 -8px 6px -6px rgba(0,0,0,0.15); }
    #menu2 a, #menu3 a { padding: 6px 13px; }

    .session .group_tag { float: none; display: inline-block; margin-top: 4px; }

    table.talks, table.talks tbody, table.talks tr, table.talks td { display: block; width: auto; }
    table.talks td.time { width: auto; padding-bottom: 0; white-space: normal; }
    tr.talk { margin-bottom: 10px; padding-top: 6px; border-top: 1px dashed var(--color-border-dashed); }
    tr.talk td.time { border-top: none; }

    table.index, table.index tbody, table.index tr, table.index td { display: block; width: auto; }
    table.index tr.entry td { border-bottom: none; padding: 2px 10px; }
    table.index tr.entry { border-bottom: 1px solid var(--color-border-light); padding-bottom: 6px; margin-bottom: 6px; }

    .room_sessions .session_meta { display: block; margin-left: 0; margin-top: 2px; }

    table.bio_layout, table.bio_layout tbody, table.bio_layout tr, table.bio_layout td { display: block; width: auto; }
    .bio_photo_cell { padding-right: 0; padding-bottom: 12px; text-align: center; }
    .bio_img, .bio_img_placeholder { margin: 0 auto; }

    .bio_affiliations, .bio_affiliations tbody, .bio_affiliations tr, .bio_affiliations td { display: block; width: auto; }
    .bio_affiliation_label { padding-bottom: 0; }

    .bio_table, .bio_table tbody, .bio_table tr, .bio_table td { display: block; width: auto; }
}