:root{
/* ================= FONT SIZES: change them here ================= */
--fs-body:17px;            /* normal text, paragraphs, consent and intro text */
--fs-title:1.9rem;         /* page titles */
--fs-heading:1.2rem;       /* section headings */
--fs-explanation:1.45rem;  /* Part 1: the explanation sentence */
--fs-question:1rem;        /* Part 1: the four statements */
--fs-scale:.82rem;         /* Part 1: labels under the radio buttons ("Completely disagree" ...) */
--fs-rank:1.1rem;          /* Part 2: the sentences you rank */
--fs-button:1rem;          /* buttons */
--fs-small:.92rem;         /* hints, "3 of 18", footnotes */
--fs-tiny:.8rem;           /* participant ID line */
--fs-stat:1.5rem;          /* big numbers on the analysis page */
/* ================================================================= */
--bg:#eef2f6;--card:#fff;--ink:#17212b;--muted:#5d6b79;--line:#d5dde6;--accent:#1f5f7a;--accent-ink:#fff;--soft:#e3eef3;--warn:#a23b2a;
--serif:Georgia,"Iowan Old Style","Times New Roman",serif;--sans:system-ui,-apple-system,"Segoe UI",Roboto,sans-serif}
@media (max-width:520px){:root{   /* phone sizes */
--fs-title:1.6rem;--fs-explanation:1.2rem;--fs-scale:.7rem;--fs-rank:1rem}}
@media (prefers-color-scheme:dark){:root{--bg:#10171e;--card:#18222c;--ink:#e8eef4;--muted:#9aa9b8;--line:#2c3a47;--accent:#6fb4d1;--accent-ink:#0c1a22;--soft:#1f3340;--warn:#ff9d8a}}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--ink);font:var(--fs-body)/1.6 var(--sans)}
.wrap{max-width:760px;margin:0 auto;padding:28px 18px 64px}
.progress{height:6px;background:var(--line);border-radius:3px;margin-bottom:28px;overflow:hidden}
.progress div{height:100%;background:var(--accent);transition:width .4s}
h1{font-size:var(--fs-title);line-height:1.25;margin:0 0 .6em}
h2{font-size:var(--fs-heading);margin:1.6em 0 .4em}
p,li{max-width:66ch}
.muted{color:var(--muted);font-size:var(--fs-small)}
.card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:26px;margin:18px 0}
.btn{display:inline-block;border:0;border-radius:8px;background:var(--accent);color:var(--accent-ink);font:600 var(--fs-button) var(--sans);padding:12px 26px;cursor:pointer;text-decoration:none}
.btn:disabled{opacity:.4;cursor:not-allowed}
.btn.ghost{background:transparent;color:var(--muted);border:1px solid var(--line)}
.row{display:flex;gap:12px;flex-wrap:wrap;align-items:center;margin-top:22px}
:focus-visible{outline:3px solid var(--accent);outline-offset:2px}
.error{color:var(--warn);font-weight:600;margin:14px 0 0}
.check{display:flex;gap:10px;align-items:flex-start;margin-top:18px}
.check input{margin-top:6px;width:18px;height:18px}
.pid{text-align:right;color:var(--muted);font-size:var(--fs-tiny);margin:-14px 0 14px}
.toast{position:fixed;left:50%;bottom:24px;transform:translateX(-50%);background:var(--ink);color:var(--bg);padding:10px 18px;border-radius:8px;font-size:var(--fs-small);z-index:10;max-width:90vw}

/* Text for AI assistants: invisible to people, present in the HTML */
.vh{position:absolute;left:-9999px;top:auto;width:1px;height:1px;overflow:hidden;user-select:none}

/* Part 1 */
.meta{display:flex;justify-content:space-between;color:var(--muted);font-size:var(--fs-small);margin-bottom:10px}
.explanation{background:var(--soft);border-left:5px solid var(--accent);border-radius:8px;padding:26px 28px;margin:0 0 26px;font:var(--fs-explanation)/1.5 var(--serif)}
.q{padding:18px 0;border-top:1px solid var(--line)}
.q:first-of-type{border-top:0}
.q p{margin:0 0 12px;font-weight:600;font-size:var(--fs-question)}
.scale{display:grid;grid-template-columns:repeat(5,1fr);gap:8px}
.scale label{position:relative;display:flex;flex-direction:column;align-items:center;gap:6px;text-align:center;font-size:var(--fs-scale);line-height:1.25;color:var(--muted);cursor:pointer;padding:10px 4px;border:1px solid var(--line);border-radius:8px;background:var(--card)}
.scale input{width:20px;height:20px;accent-color:var(--accent);margin:0;cursor:pointer}
.scale label:hover{border-color:var(--accent)}
.scale label:has(input:checked){border-color:var(--accent);background:var(--soft);color:var(--ink);font-weight:600}
.scale label:has(input:disabled){cursor:default}
@media (max-width:520px){.scale label{padding:8px 2px}.explanation{padding:20px}}

/* Part 2 */
.rank-hint{display:flex;justify-content:space-between;color:var(--muted);font-size:var(--fs-small);margin:6px 4px}
#rank{list-style:none;margin:0;padding:0}
#rank li{display:flex;align-items:center;gap:12px;background:var(--card);border:1px solid var(--line);border-radius:10px;padding:14px;margin-bottom:10px;font:var(--fs-rank)/1.45 var(--serif);max-width:none}
#rank .pos{flex:none;width:30px;height:30px;border-radius:50%;background:var(--soft);color:var(--accent);display:grid;place-items:center;font:700 var(--fs-small) var(--sans)}
#rank .grip{flex:none;cursor:grab;color:var(--muted);font-size:1.3rem;user-select:none;touch-action:none;padding:0 4px}
#rank .txt{flex:1}
#rank .mv{flex:none;display:flex;flex-direction:column;gap:2px}
#rank .mv button{border:1px solid var(--line);background:transparent;color:var(--muted);border-radius:5px;cursor:pointer;line-height:1;padding:3px 7px}
.sortable-ghost{opacity:.35}.sortable-chosen{box-shadow:0 8px 24px rgba(0,0,0,.18);border-color:var(--accent)!important}

/* Analysis */
.bar{margin:14px 0}.bar .t{display:flex;justify-content:space-between;font-weight:600}
.bar .track{height:10px;background:var(--line);border-radius:5px;margin-top:6px}
.bar .fill{height:100%;background:var(--accent);border-radius:5px}
.times{display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:12px;margin:18px 0}
.tile{background:var(--card);border:1px solid var(--line);border-radius:10px;padding:16px}
.tile .v{font:700 var(--fs-stat) var(--sans)}
.tile .l{font-size:var(--fs-small)}
.tile .s{font-size:var(--fs-tiny);color:var(--muted);margin-top:4px}

/* Fixed-height document pages (consent, intro): text scrolls, agreement + buttons stay at the bottom */
body.fixed{overflow:hidden}
body.fixed .wrap{max-width:960px;height:100vh;height:100dvh;display:flex;flex-direction:column;padding-top:20px;padding-bottom:14px}
body.fixed .progress{flex:none;margin-bottom:14px}
body.fixed .pid{flex:none;margin:-6px 0 8px}
.doc{flex:1;min-height:0;display:flex;flex-direction:column}
.doc-scroll{flex:1;min-height:0;overflow-y:auto;background:var(--card);border:1px solid var(--line);border-radius:12px;padding:6px 34px 26px}
.doc-scroll h1{margin-top:24px}
.doc-scroll p,.doc-scroll li{max-width:none}
.doc-foot{flex:none;padding-top:14px}
.doc-foot .check{margin-top:0}
.doc-foot .row{margin-top:14px}
@media (max-width:520px){body.fixed .wrap{padding-left:12px;padding-right:12px}.doc-scroll{padding:2px 16px 18px}}