/* Layout: a school exercise notebook (schrift) — ruled paper card for the exercise, ballpoint-blue ink, red-pen corrections. */
:root {
  --paper: #F5F7FB;
  --surface: #FFFFFF;
  --ink: #17223A;
  --muted: #5A6681;
  --rule: #D7E0EE;
  --line: #E3E8F2;
  --accent: #1E4DB7;
  --accent-soft: #E6EDFB;
  --red: #CC3527;
  --red-soft: #FBE9E6;
  --green: #23824F;
  --green-soft: #E3F3EA;
  --amber: #B7791F;
  --margin: #EBA9A1;
  --f-display: "Young Serif", Georgia, "Times New Roman", serif;
  --f-body: "Atkinson Hyperlegible", system-ui, -apple-system, "Segoe UI", sans-serif;
  --f-mono: "IBM Plex Mono", ui-monospace, Consolas, monospace;
  --f-pen: "Caveat", "Segoe Print", "Comic Sans MS", cursive;
  --radius: 10px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) {
  --paper: #0F1420; --surface: #161D2C; --ink: #E5EAF4; --muted: #98A3BA; --rule: #263049; --line: #232C40;
  --accent: #86A6FF; --accent-soft: #1D2944; --red: #FF7F72; --red-soft: #3A1E1E; --green: #5FCB8E; --green-soft: #17322A;
  --amber: #E6B25A; --margin: #6B3A3A; color-scheme: dark; } }
:root[data-theme="dark"] {
  --paper: #0F1420; --surface: #161D2C; --ink: #E5EAF4; --muted: #98A3BA; --rule: #263049; --line: #232C40;
  --accent: #86A6FF; --accent-soft: #1D2944; --red: #FF7F72; --red-soft: #3A1E1E; --green: #5FCB8E; --green-soft: #17322A;
  --amber: #E6B25A; --margin: #6B3A3A; color-scheme: dark; }

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--paper); color: var(--ink); font-family: var(--f-body); font-size: 15px; line-height: 1.5; }
[hidden] { display: none !important; }
.wrap { max-width: 1080px; margin: 0 auto; padding-left: max(16px, env(safe-area-inset-left, 0px)); padding-right: max(16px, env(safe-area-inset-right, 0px)); padding-top: max(20px, env(safe-area-inset-top, 0px)); padding-bottom: max(48px, env(safe-area-inset-bottom, 0px)); }
h1, h2, h3 { font-family: var(--f-display); font-weight: 400; text-wrap: balance; margin: 0; }
button, input, select { font: inherit; color: inherit; }
button { cursor: pointer; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.mono { font-family: var(--f-mono); }
.muted { color: var(--muted); }
.label { font-size: 12px; text-transform: uppercase; letter-spacing: .08em; color: var(--muted); font-weight: 700; }

header.top { display: flex; flex-wrap: wrap; align-items: flex-end; justify-content: space-between; gap: 12px 24px; padding-bottom: 14px; border-bottom: 2px solid var(--ink); }
.brand h1 { font-size: 34px; line-height: 1.1; }
.brand p { margin: 4px 0 0; color: var(--muted); }
nav.tabs { display: flex; gap: 4px; flex-wrap: wrap; }
nav.tabs button { border: 0; background: none; padding: 8px 14px; border-radius: 999px; color: var(--muted); font-weight: 700; }
nav.tabs button[aria-selected="true"] { background: var(--ink); color: var(--paper); }
.status { font-size: 12px; color: var(--muted); margin-top: 10px; display: flex; align-items: center; gap: 6px; }
.status .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--amber); flex: none; }
.status.ok .dot { background: var(--green); }

main { margin-top: 24px; }
.grid { display: grid; gap: 24px; grid-template-columns: minmax(0, 1fr); }
@media (min-width: 880px) { .grid.two { grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr); } }

.panel { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; min-width: 0; }
.panel h2 { font-size: 22px; margin-bottom: 14px; }
.field { display: grid; gap: 8px; padding-block: 12px; border-top: 1px dashed var(--line); }
.field:first-of-type { border-top: 0; padding-top: 0; }
.field-head { display: flex; justify-content: space-between; align-items: baseline; gap: 8px; }
.linkbtn { border: 0; background: none; color: var(--accent); font-size: 13px; padding: 0; }

.seg { display: inline-flex; flex-wrap: wrap; background: var(--paper); border: 1px solid var(--line); border-radius: 999px; padding: 3px; gap: 2px; justify-self: start; }
.seg button { border: 0; background: none; padding: 6px 14px; border-radius: 999px; color: var(--muted); font-weight: 700; font-size: 14px; }
.seg button[aria-pressed="true"] { background: var(--surface); color: var(--ink); box-shadow: 0 1px 2px rgba(0,0,0,.12); }

.chips { display: flex; flex-wrap: wrap; gap: 6px; }
.chip { position: relative; display: inline-flex; align-items: center; gap: 6px; border: 1px solid var(--line); background: var(--surface); border-radius: 8px; padding: 6px 10px; font-size: 14px; user-select: none; cursor: pointer; }
.chip input { position: absolute; opacity: 0; pointer-events: none; }
.chip .abbr { font-family: var(--f-mono); font-size: 12px; font-weight: 500; color: var(--muted); }
.chip:has(input:checked) { border-color: var(--accent); background: var(--accent-soft); color: var(--ink); }
.chip:has(input:checked) .abbr { color: var(--accent); }
.chip:has(input:focus-visible) { outline: 2px solid var(--accent); outline-offset: 2px; }
.check { display: flex; gap: 8px; align-items: center; font-size: 14px; }

.actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 16px; }
.btn { display: inline-flex; align-items: center; gap: 6px; border: 1px solid var(--ink); background: var(--ink); color: var(--paper); padding: 10px 18px; border-radius: 8px; font-weight: 700; text-decoration: none; font-size: 15px; }
.btn.ghost { background: transparent; color: var(--ink); border-color: var(--line); }
.btn.accent { background: var(--accent); border-color: var(--accent); color: var(--surface); }
.btn.danger { background: var(--red); border-color: var(--red); color: var(--surface); }
.btn.sm { padding: 5px 10px; font-size: 13px; }
.btn:disabled { opacity: .45; cursor: not-allowed; }
.hint { font-size: 13px; color: var(--muted); }
.warn { font-size: 13px; color: var(--red); margin: 0; }
.okmsg { font-size: 13px; color: var(--green); margin: 0; }

/* exercise notebook page */
.page { position: relative; background-color: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px 22px 26px 64px; min-width: 0;
  background-image: linear-gradient(to right, transparent 46px, var(--margin) 46px, var(--margin) 47px, transparent 47px), repeating-linear-gradient(to bottom, transparent 0 35px, var(--rule) 35px 36px);
  background-position: 0 0, 0 14px; }
@media (max-width: 520px) { .page { padding-left: 22px; background-image: repeating-linear-gradient(to bottom, transparent 0 35px, var(--rule) 35px 36px); } }
.qnum { position: absolute; left: 10px; top: 24px; width: 30px; text-align: center; font-family: var(--f-mono); font-size: 12px; color: var(--muted); }
@media (max-width: 520px) { .qnum { position: static; width: auto; text-align: left; margin-bottom: 4px; } }
.progress { height: 4px; background: var(--line); border-radius: 4px; overflow: hidden; margin-bottom: 18px; }
.progress span { display: block; height: 100%; background: var(--accent); transition: width .3s; }
.qmeta { display: flex; flex-wrap: wrap; gap: 6px 12px; align-items: center; margin-bottom: 10px; font-size: 13px; color: var(--muted); }
.tag { font-family: var(--f-mono); font-size: 12px; padding: 2px 7px; border-radius: 5px; background: var(--accent-soft); color: var(--accent); }
.tag.irr { background: var(--red-soft); color: var(--red); }
.prompt { font-family: var(--f-display); font-size: clamp(24px, 4.4vw, 34px); line-height: 1.25; margin: 6px 0 4px; overflow-wrap: anywhere; }
.prompt .blank { display: inline-block; min-width: 3.5em; border-bottom: 2px solid var(--ink); }
.prompt .inf { color: var(--muted); font-size: .62em; font-family: var(--f-body); }
.sub { color: var(--muted); margin-bottom: 16px; }
.answer-row { display: flex; gap: 10px; flex-wrap: wrap; }
.answer-row input { flex: 1 1 220px; min-width: 0; padding: 11px 14px; border: 1.5px solid var(--ink); border-radius: 8px; background: var(--surface); font-family: var(--f-mono); font-size: 18px; }
.answer-row input:disabled { opacity: .8; }
.options { display: grid; gap: 8px; grid-template-columns: minmax(0,1fr); }
@media (min-width: 560px) { .options { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
.opt { text-align: left; display: flex; gap: 10px; align-items: center; border: 1.5px solid var(--line); background: var(--surface); padding: 11px 14px; border-radius: 8px; font-family: var(--f-mono); font-size: 16px; min-width: 0; overflow-wrap: anywhere; }
.opt .k { font-size: 11px; color: var(--muted); border: 1px solid var(--line); border-radius: 4px; padding: 0 5px; flex: none; }
.opt:hover:not(:disabled) { border-color: var(--accent); }
.opt.right { border-color: var(--green); background: var(--green-soft); }
.opt.wrong { border-color: var(--red); background: var(--red-soft); text-decoration: line-through; text-decoration-color: var(--red); }
.opt:disabled { cursor: default; }
.feedback { margin-top: 16px; padding: 12px 14px; border-radius: 8px; display: grid; gap: 4px; }
.feedback.good { background: var(--green-soft); }
.feedback.bad { background: var(--red-soft); }
.feedback .verdict { font-weight: 700; }
.feedback.good .verdict { color: var(--green); }
.feedback.bad .verdict { color: var(--red); }
.pen { font-family: var(--f-pen); color: var(--red); font-size: 28px; line-height: 1.1; }
.feedback.good .pen { color: var(--green); }
.errtype { font-size: 12px; font-weight: 700; text-transform: uppercase; letter-spacing: .06em; color: var(--red); }
.foot { display: flex; justify-content: space-between; align-items: center; gap: 10px; flex-wrap: wrap; margin-top: 18px; }
.kbd { font-family: var(--f-mono); font-size: 11px; border: 1px solid var(--line); border-radius: 4px; padding: 0 5px; }

/* summary */
.score { display: flex; align-items: baseline; gap: 14px; flex-wrap: wrap; margin: 6px 0 14px; }
.score .big { font-family: var(--f-display); font-size: 56px; line-height: 1; }
.score .pen { font-size: 34px; }
.mistakes { list-style: none; padding: 0; margin: 0; display: grid; gap: 0; }
.mistakes li { display: grid; grid-template-columns: minmax(0,1fr) auto; gap: 2px 12px; padding: 9px 0; border-bottom: 1px solid var(--line); }
.mistakes .q { font-size: 14px; }
.mistakes .a { font-family: var(--f-mono); font-size: 14px; overflow-wrap: anywhere; }
.mistakes .a s { color: var(--red); }
.mistakes .a b { color: var(--green); font-weight: 500; }
.mistakes .t { grid-row: span 2; align-self: center; font-size: 11px; color: var(--muted); text-transform: uppercase; letter-spacing: .05em; text-align: right; }

/* conjugation table */
.tablewrap { overflow-x: auto; margin-inline: -4px; }
table { border-collapse: collapse; width: 100%; font-size: 13px; }
th, td { text-align: left; padding: 6px 8px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { font-weight: 700; color: var(--muted); font-size: 12px; }
td.f { font-family: var(--f-mono); white-space: nowrap; }
td.tn { white-space: nowrap; }
td.tn .abbr { font-family: var(--f-mono); color: var(--accent); font-size: 12px; }
select { padding: 7px 10px; border-radius: 8px; border: 1px solid var(--line); background: var(--surface); max-width: 100%; }
.lookup-head { display: flex; justify-content: space-between; gap: 10px; flex-wrap: wrap; align-items: center; margin-bottom: 10px; }
.vinfo { font-size: 13px; color: var(--muted); margin: 0 0 10px; }

/* history + advice */
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(130px, 1fr)); gap: 12px; margin-bottom: 20px; }
.stat { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 16px; }
.stat .v { font-family: var(--f-display); font-size: 30px; line-height: 1.1; font-variant-numeric: tabular-nums; }
.chart svg { width: 100%; height: auto; display: block; }
.histtable td, .histtable th { font-variant-numeric: tabular-nums; }
.pct { font-weight: 700; }
.pct.hi { color: var(--green); } .pct.mid { color: var(--amber); } .pct.lo { color: var(--red); }
.empty { padding: 28px 20px; text-align: center; color: var(--muted); border: 1.5px dashed var(--line); border-radius: var(--radius); }
.empty h3 { color: var(--ink); font-size: 20px; margin-bottom: 6px; }
.bars { display: grid; gap: 10px; }
.bar-row { display: grid; grid-template-columns: minmax(0, 190px) minmax(0, 1fr) 64px; gap: 10px; align-items: center; font-size: 14px; }
@media (max-width: 520px) { .bar-row { grid-template-columns: minmax(0,1fr) 56px; } .bar-row .track { grid-column: 1 / -1; grid-row: 2; } }
.track { height: 10px; background: var(--line); border-radius: 6px; overflow: hidden; }
.track span { display: block; height: 100%; border-radius: 6px; }
.bar-row .n { text-align: right; font-variant-numeric: tabular-nums; font-size: 13px; }
.advice { list-style: none; margin: 0; padding: 0; display: grid; gap: 14px; }
.advice li { display: grid; grid-template-columns: 4px minmax(0, 1fr); gap: 14px; }
.advice li::before { content: ""; border-radius: 2px; background: var(--accent); }
.advice li.sev-hi::before { background: var(--red); }
.advice li.sev-mid::before { background: var(--amber); }
.advice li.sev-ok::before { background: var(--green); }
.advice h3 { font-family: var(--f-body); font-weight: 700; font-size: 15px; }
.advice p { margin: 2px 0 0; color: var(--muted); max-width: 68ch; }
.weaklist { display: flex; flex-wrap: wrap; gap: 6px; }
.weak { font-family: var(--f-mono); font-size: 13px; padding: 4px 9px; border-radius: 6px; background: var(--red-soft); color: var(--ink); }
.weak small { color: var(--red); margin-left: 4px; }
.section-gap { display: grid; gap: 24px; }
.confirm { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; font-size: 14px; }

/* forms: sign-in, account, users */
.auth { max-width: 420px; margin: 32px auto 0; }
.auth .panel { padding: 24px; }
.auth p.lead { margin: 0 0 18px; color: var(--muted); }
.form { display: grid; gap: 12px; }
.form + .form { margin-top: 22px; padding-top: 18px; border-top: 1px dashed var(--line); }
.form h3 { font-family: var(--f-body); font-weight: 700; font-size: 15px; }
.form label.in { display: grid; gap: 4px; font-size: 13px; font-weight: 700; color: var(--muted); }
.form input[type=text], .form input[type=password] { width: 100%; padding: 10px 12px; border: 1.5px solid var(--line); border-radius: 8px; background: var(--surface); font-size: 16px; font-weight: 400; color: var(--ink); }
.form input[type=text]:focus, .form input[type=password]:focus { border-color: var(--accent); }
.form .actions { margin-top: 4px; }
.users td { vertical-align: middle; }
.users .acts { display: flex; flex-wrap: wrap; gap: 6px; justify-content: flex-end; }
.users tr.editing td { border-bottom: 0; }
.inline-form { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; padding: 4px 0 12px; }
.inline-form input { flex: 1 1 180px; min-width: 0; padding: 7px 10px; border: 1.5px solid var(--line); border-radius: 8px; background: var(--surface); font-size: 16px; }
.role { font-size: 12px; font-family: var(--f-mono); padding: 1px 6px; border-radius: 5px; background: var(--accent-soft); color: var(--accent); }
@media (prefers-reduced-motion: reduce) { * { transition: none !important; animation: none !important; } }

/* word order: tiles, and accent keys for writing Spanish */
.prompt.sentence { font-size: clamp(20px, 3.6vw, 28px); }
.built { min-height: 54px; display: flex; flex-wrap: wrap; gap: 6px; align-items: center; padding: 8px 0; border-bottom: 2px solid var(--ink); margin-bottom: 14px; }
.built.right { border-color: var(--green); }
.built.wrong { border-color: var(--red); }
.built .placeholder { color: var(--muted); font-size: 14px; }
.tiles { display: flex; flex-wrap: wrap; gap: 8px; }
.tile { border: 1.5px solid var(--line); background: var(--surface); border-radius: 8px; padding: 8px 12px; font-family: var(--f-mono); font-size: 16px; min-height: 40px; }
.tile:hover:not(:disabled) { border-color: var(--accent); }
.built .tile { border-color: var(--accent); background: var(--accent-soft); }
.built.right .tile { border-color: var(--green); background: var(--green-soft); }
.built.wrong .tile { border-color: var(--red); background: var(--red-soft); }
.tile:disabled { cursor: default; color: inherit; }
.keys { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 10px; }
.keys button { min-width: 38px; min-height: 36px; padding: 4px 8px; border: 1px solid var(--line); background: var(--surface); border-radius: 6px; font-family: var(--f-mono); font-size: 16px; }
.keys button:hover { border-color: var(--accent); }
.tag.stem { background: var(--paper); color: var(--amber); border: 1px solid var(--line); }

/* scoreboard */
.avatar { display: block; flex: none; overflow: visible; }
.board-head { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: flex-end; gap: 12px; }
.board-head h2 { font-size: 28px; }
.podium { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); align-items: end; gap: 10px; max-width: 720px; width: 100%; margin: 8px auto 0; }
.spot { display: flex; flex-direction: column; align-items: center; text-align: center; gap: 2px; min-width: 0; }
.spot .avatar { margin-bottom: 6px; filter: drop-shadow(0 6px 10px rgba(0,0,0,.18)); }
.spot-1 .avatar { animation: bob 3s ease-in-out infinite; }
.spot-name { font-size: 16px; overflow-wrap: anywhere; }
.spot-1 .spot-name { font-size: 19px; }
.spot-title { font-family: var(--f-pen); font-size: 22px; line-height: 1; color: var(--amber); }
.spot-pts { color: var(--muted); font-size: 13px; }
.spot-pts span { font-family: var(--f-display); font-size: 24px; color: var(--ink); }
.spot-1 .spot-pts span { font-size: 30px; }
.spot .block { width: 100%; margin-top: 10px; border-radius: 10px 10px 0 0; display: flex; justify-content: center; align-items: flex-start; padding-top: 8px;
  font-family: var(--f-display); font-size: 28px; color: var(--paper); background: var(--muted); }
.spot-1 .block { height: 120px; background: linear-gradient(#F2C230, #C88A00); }
.spot-2 .block { height: 86px; background: linear-gradient(#C9D0D9, #8E98A6); }
.spot-3 .block { height: 64px; background: linear-gradient(#E3A56E, #A85E27); }
.empty-spot .block { opacity: .25; }
.spot.me .spot-name b { color: var(--accent); }
.badge { display: inline-block; font-size: 12px; font-weight: 700; padding: 2px 8px; border-radius: 999px; background: var(--accent-soft); color: var(--accent); margin-top: 4px; }
.badge.sm { font-size: 11px; padding: 1px 7px; margin: 3px 4px 0 0; }
.lang { font-family: var(--f-mono); font-size: 11px; padding: 0 5px; border-radius: 4px; border: 1px solid var(--line); color: var(--muted); margin-left: 2px; }
table.board td { vertical-align: middle; }
table.board th.num, table.board td.num { text-align: right; white-space: nowrap; font-variant-numeric: tabular-nums; }
table.board td.rank { font-family: var(--f-display); font-size: 18px; width: 2em; }
table.board tr.me td { background: var(--accent-soft); }
.player { display: flex; align-items: center; gap: 10px; min-width: 0; }
.linkbtn.name { font-size: inherit; font-weight: 700; text-decoration: underline; text-underline-offset: 3px; }
.viewing { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 10px; padding: 10px 14px; margin-bottom: 20px;
  border-radius: var(--radius); background: var(--accent-soft); border: 1px solid var(--accent); }
.viewing .who { display: flex; align-items: center; gap: 10px; }
@keyframes bob { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-5px); } }
@media (max-width: 520px) {
  .spot-1 .avatar { width: 96px; height: 96px; } .spot-2 .avatar, .spot-3 .avatar { width: 68px; height: 68px; }
  .spot-1 .block { height: 90px; } .spot-2 .block { height: 64px; } .spot-3 .block { height: 48px; }
  table.board th:nth-child(5), table.board td:nth-child(5) { display: none; }
  table.board th, table.board td { padding: 6px 4px; }
  table.board .badge.sm, table.board .lang { display: none; }
  table.board .player { gap: 6px; }
  table.board .player .avatar { width: 32px; height: 32px; }
  .spot-title { font-size: 18px; }
  .spot .badge { font-size: 11px; }
}

/* flashcards */
.card-wrap { perspective: 1200px; margin: 6px 0 4px; }
.card { position: relative; display: block; width: 100%; height: 220px; padding: 0; border: 0; background: none; cursor: pointer;
  transform-style: preserve-3d; transition: transform .45s cubic-bezier(.2, .7, .2, 1); }
.card.flipped { transform: rotateY(180deg); }
.card .face { position: absolute; inset: 0; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 8px; padding: 18px;
  border-radius: 14px; border: 1.5px solid var(--line); background: var(--surface); box-shadow: 0 6px 18px rgba(0,0,0,.08);
  backface-visibility: hidden; -webkit-backface-visibility: hidden; text-align: center; }
.card .back { transform: rotateY(180deg); border-color: var(--accent); background: var(--accent-soft); }
.card .word { font-family: var(--f-display); font-size: clamp(24px, 5vw, 36px); line-height: 1.2; color: var(--ink); overflow-wrap: anywhere; }
.card .back .word.many { font-size: clamp(20px, 4.2vw, 30px); }
.card .hint { margin: 0; }
.card:focus-visible { outline: none; }
.card:focus-visible .face { outline: 2px solid var(--accent); outline-offset: 2px; }
.actions.grade { justify-content: center; }
.actions.grade .btn { min-width: 150px; justify-content: center; }