/* ---------- Font: Geist (variabile, incluso nell'app per l'uso offline; licenza OFL in vendor/geist) */
@font-face { font-family: "Geist"; src: url("vendor/geist/Geist-Variable.woff2") format("woff2"); font-weight: 100 900; font-style: normal; font-display: swap; }
@font-face { font-family: "Geist"; src: url("vendor/geist/Geist-Italic-Variable.woff2") format("woff2"); font-weight: 100 900; font-style: italic; font-display: swap; }

/* ---------- Tema */
:root {
  --card-border: transparent;
  --bg: #f4f5f9;
  --surface: #ffffff;
  --surface-2: #eef0f5;
  --border: #e3e6ee;
  --text: #0f1729;
  --text-2: #5b6478;
  --text-3: #8b93a5;
  --brand: #13306b;
  --accent: #3b6fe0;
  --accent-soft: color-mix(in srgb, var(--accent) 12%, transparent);
  --ok: #16a34a;
  --ok-soft: #e8f7ee;
  --ko: #dc2626;
  --ko-soft: #fdeceb;
  --warn: #d97706;
  --warn-soft: #fff4e0;
  --shadow: 0 1px 2px rgb(15 23 41 / .04), 0 4px 16px rgb(15 23 41 / .05);
  --r: 16px;
  --r-sm: 11px;
  --sat: env(safe-area-inset-top);
  --sab: env(safe-area-inset-bottom);
  --sal: env(safe-area-inset-left);
  --sar: env(safe-area-inset-right);
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0b0e14; --surface: #151a23; --surface-2: #1d2430; --border: #262e3c;
    --text: #e8ecf3; --text-2: #a3adbf; --text-3: #6f7a8d; --brand: #8fb0ff;
    --ok: #22c55e; --ok-soft: #10261a; --ko: #f87171; --ko-soft: #2c1517; --warn: #f59e0b; --warn-soft: #2a2010;
    --shadow: 0 1px 2px rgb(0 0 0 / .3); color-scheme: dark; --card-border: var(--border);
  }
}
:root[data-theme="dark"] {
  --bg: #0b0e14; --surface: #151a23; --surface-2: #1d2430; --border: #262e3c;
  --text: #e8ecf3; --text-2: #a3adbf; --text-3: #6f7a8d; --brand: #8fb0ff;
  --ok: #22c55e; --ok-soft: #10261a; --ko: #f87171; --ko-soft: #2c1517; --warn: #f59e0b; --warn-soft: #2a2010;
  --shadow: 0 1px 2px rgb(0 0 0 / .3); color-scheme: dark; --card-border: var(--border);
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font: 16px/1.5 "Geist", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  -webkit-font-smoothing: antialiased; -webkit-tap-highlight-color: transparent;
}
button, input, textarea, select { font: inherit; color: inherit; }
button { cursor: pointer; border: 0; background: none; padding: 0; }
a { color: var(--accent); text-decoration: none; }
img { max-width: 100%; }
h1, h2, h3 { line-height: 1.2; margin: 0; letter-spacing: -.02em; text-wrap: balance; }
.skip { position: absolute; left: 12px; top: -60px; z-index: 300; padding: 10px 16px; border-radius: 10px; background: var(--accent); color: #fff; font-weight: 600; }
.skip:focus { top: calc(8px + var(--sat)); }
[hidden] { display: none !important; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 6px; }

/* ---------- Layout: mobile (topbar + tabbar), desktop (sidebar) */
#app { min-height: 100dvh; }
.main { min-width: 0; }
.topbar {
  position: sticky; top: 0; z-index: 20; display: flex; align-items: center; gap: 12px;
  padding: calc(var(--sat) + 10px) calc(16px + var(--sar)) 10px calc(16px + var(--sal));
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: saturate(180%) blur(18px); -webkit-backdrop-filter: saturate(180%) blur(18px);
  border-bottom: 1px solid transparent;
}
.topbar.scrolled { border-bottom-color: var(--border); }
.topbar h1 { font-size: 17px; font-weight: 700; flex: 1; min-width: 0; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
#view { padding: 8px calc(16px + var(--sar)) calc(96px + var(--sab)) calc(16px + var(--sal)); max-width: 980px; margin: 0 auto; outline: none; }
.tabbar {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 30; display: grid; grid-template-columns: repeat(5, 1fr);
  padding: 6px calc(8px + var(--sar)) calc(6px + var(--sab)) calc(8px + var(--sal));
  background: color-mix(in srgb, var(--surface) 85%, transparent);
  backdrop-filter: saturate(180%) blur(18px); -webkit-backdrop-filter: saturate(180%) blur(18px);
  border-top: 1px solid var(--border);
}
.tabbar a { display: flex; flex-direction: column; align-items: center; gap: 2px; padding: 4px 0; font-size: 10.5px; font-weight: 600; color: var(--text-3); }
.tabbar a svg { width: 25px; height: 25px; }
.tabbar a.on { color: var(--accent); }
.sidebar { display: none; }
body.runner .tabbar, body.runner .topbar { display: none; }
body.runner #view { padding-bottom: calc(24px + var(--sab)); max-width: 1180px; }

@media (min-width: 900px) {
  #app { display: grid; grid-template-columns: 264px 1fr; }
  .sidebar {
    display: flex; flex-direction: column; gap: 4px; position: sticky; top: 0; height: 100dvh; overflow: auto;
    padding: calc(20px + var(--sat)) 14px 20px calc(14px + var(--sal)); background: var(--surface); border-right: 1px solid var(--border);
  }
  .tabbar { display: none; }
  #view { padding: 12px 32px 48px; }
  .topbar { padding-left: 32px; padding-right: 32px; }
  body.runner #app { grid-template-columns: 1fr; }
  body.runner .sidebar { display: none; }
}
.brand { display: flex; align-items: center; gap: 10px; padding: 4px 8px 16px; font-weight: 800; font-size: 17px; }
.brand img { width: 34px; height: 34px; border-radius: 9px; }
.side-link { display: flex; align-items: center; gap: 12px; padding: 9px 12px; border-radius: 10px; color: var(--text-2); font-weight: 600; font-size: 15px; }
.side-link svg { width: 21px; height: 21px; }
.side-link:hover { background: var(--surface-2); }
.side-link.on { background: var(--accent-soft); color: var(--accent); }
.side-sep { height: 1px; background: var(--border); margin: 10px 8px; }
.side-label { font-size: 13px; font-weight: 600; color: var(--text-3); padding: 8px 12px 4px; }

/* ---------- Componenti */
.subject-chip {
  display: inline-flex; align-items: center; gap: 8px; padding: 7px 12px 7px 10px; border-radius: 999px;
  background: var(--surface); border: 1px solid var(--border); font-weight: 650; font-size: 14px; max-width: 60vw;
  box-shadow: var(--shadow);
}
.subject-chip span { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.subject-chip svg { width: 14px; height: 14px; color: var(--text-3); flex: none; }
.dot { width: 10px; height: 10px; border-radius: 50%; background: var(--accent); flex: none; }
.sidebar .subject-chip { width: 100%; max-width: none; justify-content: flex-start; margin-bottom: 8px; box-shadow: none; }
.sidebar .subject-chip span { flex: 1; text-align: left; }

.card { background: var(--surface); border: 1px solid var(--card-border); border-radius: var(--r); padding: 16px; box-shadow: var(--shadow); }
.card + .card, .section + .section { margin-top: 14px; }
.grid > .card, .grid > .btn { margin-top: 0; }
.section { margin-top: 22px; }
.section-h { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; margin: 0 4px 10px; }
.section-h h2 { font-size: 20px; font-weight: 750; }
.section-h a, .section-h button { font-size: 14px; font-weight: 600; color: var(--accent); }
.muted { color: var(--text-2); }
.small { font-size: 13px; }
.grid { display: grid; gap: 12px; }
.g2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
@media (min-width: 640px) { .g4 { grid-template-columns: repeat(4, minmax(0, 1fr)); } .g3 { grid-template-columns: repeat(3, minmax(0, 1fr)); } }
@media (max-width: 639px) { .g4 { grid-template-columns: repeat(2, minmax(0, 1fr)); } }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 48px; padding: 0 20px;
  border-radius: 14px; font-weight: 700; font-size: 16px; background: var(--accent); color: #fff;
  transition: transform .15s ease, background-color .2s ease, filter .2s ease, opacity .15s;
}
@media (hover: hover) {
  .btn:hover { filter: brightness(1.07); }
  .btn.secondary:hover, .btn.ghost:hover { filter: none; background: color-mix(in srgb, var(--surface-2) 82%, var(--text) 8%); }
  a.row:hover, button.row:hover, .chip:hover { background: var(--surface-2); }
  .opt:not(:disabled):hover { border-color: color-mix(in srgb, var(--accent) 45%, var(--border)); }
}
a.row, button.row, .chip, .opt, .icon-btn, .side-link { transition: background-color .2s ease, border-color .2s ease, color .2s ease; }
.btn:active { transform: scale(.97); }
.btn:disabled { opacity: .45; }
.btn.secondary { background: var(--surface-2); color: var(--text); }
.btn.ghost { background: transparent; color: var(--accent); }
.btn.danger { background: var(--ko-soft); color: var(--ko); }
.btn.block { width: 100%; }
.btn svg { width: 20px; height: 20px; }
.icon-btn { width: 40px; height: 40px; display: inline-grid; place-items: center; border-radius: 12px; color: var(--text-2); }
.icon-btn:hover { background: var(--surface-2); }
.icon-btn svg { width: 22px; height: 22px; }
.icon-btn.on { color: #f5b301; }

/* Hero dashboard */
.hero {
  position: relative; overflow: hidden; border-radius: 22px; padding: 22px 20px; color: #fff;
  background: var(--brand-hero, #13306b);
  box-shadow: inset 0 1px 0 rgb(255 255 255 / .12), 0 10px 30px -12px color-mix(in srgb, var(--brand-hero, #13306b) 60%, transparent);
}
.hero .kicker { font-size: 13px; font-weight: 500; opacity: .75; }
.hero h2 { font-size: 30px; font-weight: 700; letter-spacing: -.03em; margin: 6px 0 4px; max-width: 30ch; }
.hero p { margin: 0; opacity: .85; font-size: 14px; }
.hero .actions { display: flex; gap: 10px; margin-top: 18px; flex-wrap: wrap; position: relative; z-index: 1; }
.hero .btn { background: #fff; color: var(--brand-hero, #13306b); }
.hero .btn.secondary { background: rgb(255 255 255 / .16); color: #fff; }

.stat { padding: 14px 16px; }
.stat .v { font-size: 28px; font-weight: 700; letter-spacing: -.03em; line-height: 1.1; font-variant-numeric: tabular-nums; }
.stat .k { font-size: 13px; color: var(--text-2); font-weight: 500; margin-top: 2px; }
.stats-strip { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); padding: 0; }
.stats-strip .stat + .stat { border-left: 1px solid var(--border); }
@media (max-width: 639px) {
  .stats-strip { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .stats-strip .stat:nth-child(3) { border-left: 0; }
  .stats-strip .stat:nth-child(n+3) { border-top: 1px solid var(--border); }
}
.stat.ok .v { color: var(--ok); } .stat.ko .v { color: var(--ko); }

.ring-row { display: flex; align-items: center; gap: 18px; }
.ring { width: 96px; height: 96px; flex: none; }
.ring text { font-weight: 800; fill: var(--text); }
.legend { display: grid; gap: 6px; font-size: 14px; }
.legend i { display: inline-block; width: 10px; height: 10px; border-radius: 3px; margin-right: 8px; vertical-align: 0; }

.bar { height: 8px; border-radius: 99px; background: var(--surface-2); overflow: hidden; }
.bar > span { display: block; height: 100%; border-radius: inherit; background: var(--accent); }
.bar.ok > span { background: var(--ok); }

.list { background: var(--surface); border: 1px solid var(--card-border); border-radius: var(--r); overflow: hidden; box-shadow: var(--shadow); }
.row { display: flex; align-items: center; gap: 12px; padding: 13px 16px; border-top: 1px solid var(--border); width: 100%; text-align: left; color: var(--text); }
.row:first-child { border-top: 0; }
.row .grow { flex: 1; min-width: 0; }
.row .t { font-weight: 600; font-size: 15px; }
.row .s { font-size: 13px; color: var(--text-2); }
.row .chev { width: 18px; height: 18px; color: var(--text-3); flex: none; }
button.row:active, a.row:active { background: var(--surface-2); }
.lnum { width: 38px; height: 38px; border-radius: 11px; flex: none; display: grid; place-items: center; font-weight: 800; font-size: 14px; background: var(--accent-soft); color: var(--accent); }
.check { width: 24px; height: 24px; border-radius: 8px; border: 2px solid var(--border); flex: none; display: grid; place-items: center; }
.row.sel .check { background: var(--accent); border-color: var(--accent); }
.row.sel .check::after { content: ""; width: 10px; height: 6px; border: solid #fff; border-width: 0 0 2.5px 2.5px; transform: rotate(-45deg) translate(1px, -1px); }

.badge { display: inline-flex; align-items: center; gap: 4px; padding: 2px 8px; border-radius: 99px; font-size: 12px; font-weight: 700; background: var(--surface-2); color: var(--text-2); white-space: nowrap; }
.badge.ok { background: var(--ok-soft); color: var(--ok); }
.badge.ko { background: var(--ko-soft); color: var(--ko); }
.badge.warn { background: var(--warn-soft); color: var(--warn); }
.badge.acc { background: var(--accent-soft); color: var(--accent); }

.chips { display: flex; gap: 8px; overflow-x: auto; padding: 2px 2px 8px; scrollbar-width: none; }
.chips::-webkit-scrollbar { display: none; }
.chip { padding: 7px 14px; border-radius: 99px; background: var(--surface); border: 1px solid var(--border); font-size: 14px; font-weight: 600; white-space: nowrap; color: var(--text-2); }
.chip.on { background: var(--text); color: var(--bg); border-color: var(--text); }

.toggle-row { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 12px 16px; border-top: 1px solid var(--border); }
.toggle-row:first-child { border-top: 0; }
.switch { position: relative; width: 51px; height: 31px; flex: none; }
.switch input { opacity: 0; width: 100%; height: 100%; margin: 0; position: absolute; cursor: pointer; }
.switch span { position: absolute; inset: 0; border-radius: 99px; background: var(--surface-2); border: 1px solid var(--border); transition: background .2s; pointer-events: none; }
.switch span::after { content: ""; position: absolute; top: 2px; left: 2px; width: 25px; height: 25px; border-radius: 50%; background: #fff; box-shadow: 0 2px 4px rgb(0 0 0 / .2); transition: transform .2s; }
.switch input:checked + span { background: var(--ok); border-color: var(--ok); }
.switch input:checked + span::after { transform: translateX(20px); }
.seg { display: inline-flex; background: var(--surface-2); border-radius: 10px; padding: 2px; }
.seg button { padding: 6px 12px; border-radius: 8px; font-size: 14px; font-weight: 600; color: var(--text-2); }
.seg button.on { background: var(--surface); color: var(--text); box-shadow: var(--shadow); }

/* ---------- Runner (quiz / esame) */
.run-top {
  position: sticky; top: 0; z-index: 10; display: flex; align-items: center; gap: 10px;
  padding: calc(var(--sat) + 8px) 0 10px; background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(18px); -webkit-backdrop-filter: blur(18px);
}
.run-top .title { flex: 1; min-width: 0; }
.run-top .title b { display: block; font-size: 15px; }
.run-top .title small { color: var(--text-2); font-size: 12.5px; }
.timer { font-variant-numeric: tabular-nums; font-weight: 800; padding: 6px 10px; border-radius: 10px; background: var(--surface); border: 1px solid var(--border); font-size: 15px; }
.timer.low { color: var(--ko); border-color: var(--ko); }
.progress { height: 4px; border-radius: 99px; background: var(--surface-2); overflow: hidden; margin-bottom: 14px; }
.progress span { display: block; height: 100%; background: var(--accent); transition: width .25s; }
.run-grid { display: grid; gap: 18px; }
@media (min-width: 900px) { .run-grid { grid-template-columns: minmax(0, 1fr) 300px; align-items: start; } .run-side { position: sticky; top: 76px; } }
@media (max-width: 899px) { .run-side { display: none; } .run-side.open { display: block; } }

.q-card { padding: 20px; }
.q-meta { display: flex; align-items: flex-start; gap: 8px; margin: -6px -8px 12px 0; }
.q-meta > .grow { padding-top: 8px; }
.q-meta .grow { flex: 1; }
.q-text { font-size: 18px; font-weight: 600; line-height: 1.45; overflow-wrap: anywhere; }
.q-text img, .opt img { background: #fff; border-radius: 8px; padding: 4px; max-height: 220px; display: block; margin: 8px 0; }
.q-text p { margin: 0 0 8px; }
.opts { display: grid; gap: 10px; margin-top: 18px; }
.opt {
  display: flex; align-items: flex-start; gap: 12px; width: 100%; text-align: left; padding: 14px; min-height: 56px;
  border-radius: 14px; border: 1.5px solid var(--border); background: var(--surface); font-size: 16px; line-height: 1.4;
  transition: border-color .15s, background .15s; overflow-wrap: anywhere;
}
.opt .l { width: 28px; height: 28px; border-radius: 9px; flex: none; display: grid; place-items: center; background: var(--surface-2); font-weight: 800; font-size: 14px; color: var(--text-2); }
.opt .ot { flex: 1; min-width: 0; padding-top: 3px; }
.opt .ot p { margin: 0; }
@media (hover: hover) { .opt:not(:disabled):hover { border-color: color-mix(in srgb, var(--accent) 50%, var(--border)); } }
.opt.sel { border-color: var(--accent); background: var(--accent-soft); }
.opt.sel .l { background: var(--accent); color: #fff; }
.opt.right { border-color: var(--ok); background: var(--ok-soft); }
.opt.right .l { background: var(--ok); color: #fff; }
.opt.wrong { border-color: var(--ko); background: var(--ko-soft); }
.opt.wrong .l { background: var(--ko); color: #fff; }
.opt:disabled { cursor: default; color: var(--text); }
textarea.answer {
  width: 100%; min-height: 180px; margin-top: 16px; padding: 14px; border-radius: 14px; border: 1.5px solid var(--border);
  background: var(--surface); font-size: 16px; line-height: 1.5; resize: vertical;
}
textarea.answer:focus { outline: none; border-color: var(--accent); }
.run-actions { display: flex; gap: 10px; margin-top: 16px; }
.run-actions .btn { flex: 1; }
.navgrid { display: grid; grid-template-columns: repeat(auto-fill, minmax(40px, 1fr)); gap: 6px; }
.navgrid button { height: 40px; border-radius: 10px; background: var(--surface-2); font-weight: 700; font-size: 14px; color: var(--text-2); border: 1.5px solid transparent; }
.navgrid button.done { background: var(--accent-soft); color: var(--accent); }
.navgrid button.cur { border-color: var(--accent); }
.navgrid button.ok { background: var(--ok-soft); color: var(--ok); }
.navgrid button.ko { background: var(--ko-soft); color: var(--ko); }
.navgrid button.open::after { content: "✎"; font-size: 10px; margin-left: 1px; }

.feedback { margin-top: 16px; border-radius: 14px; padding: 14px 16px; }
.feedback.ok { background: var(--ok-soft); }
.feedback.ko { background: var(--ko-soft); }
.feedback.mid { background: var(--warn-soft); }
.feedback h3 { font-size: 16px; display: flex; align-items: center; gap: 8px; }
.feedback.ok h3 { color: var(--ok); } .feedback.ko h3 { color: var(--ko); } .feedback.mid h3 { color: var(--warn); }
.kw { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 8px; }

details.more { margin-top: 12px; border-top: 1px solid var(--border); padding-top: 10px; }
details.more summary { cursor: pointer; font-weight: 700; font-size: 15px; color: var(--accent); list-style: none; display: flex; align-items: center; gap: 6px; }
details.more summary::-webkit-details-marker { display: none; }
details.more summary::before { content: "›"; font-size: 20px; line-height: 1; transition: transform .15s; }
details.more[open] summary::before { transform: rotate(90deg); }

/* ---------- Risultati */
.score {
  text-align: center; padding: 26px 18px; border-radius: 22px; color: #fff;
  background: linear-gradient(160deg, #16a34a, #0d7a3a);
}
.score.fail { background: linear-gradient(160deg, #e5484d, #b3262b); }
.score .big { font-size: 64px; font-weight: 900; letter-spacing: -.03em; line-height: 1; }
.score .big small { font-size: 26px; opacity: .8; }
.score .res { font-size: 20px; font-weight: 800; margin-top: 6px; }
.score .sub { opacity: .9; font-size: 14px; margin-top: 4px; }
.review-item { padding: 0; overflow: hidden; }
.review-item > summary { display: flex; gap: 12px; align-items: flex-start; padding: 14px 16px; cursor: pointer; list-style: none; }
.review-item > summary::-webkit-details-marker { display: none; }
.review-item .body { padding: 0 16px 16px; }
.review-item .when-open, .review-item[open] .snip { display: none; }
.review-item[open] .when-open { display: inline; }
.st { width: 28px; height: 28px; border-radius: 50%; flex: none; display: grid; place-items: center; font-weight: 900; font-size: 14px; color: #fff; }
.st.ok { background: var(--ok); } .st.ko { background: var(--ko); } .st.mid { background: var(--warn); } .st.na { background: var(--text-3); }
.review-item .qt { font-size: 15px; font-weight: 600; flex: 1; min-width: 0; overflow-wrap: anywhere; }
.review-item .qt img { max-height: 90px; background: #fff; border-radius: 6px; }
.ans-line { font-size: 14.5px; padding: 10px 12px; border-radius: 12px; margin-top: 8px; overflow-wrap: anywhere; }
.ans-line b { display: block; font-size: 13px; font-weight: 650; opacity: .8; margin-bottom: 2px; }
.ans-line.ok { background: var(--ok-soft); } .ans-line.ko { background: var(--ko-soft); } .ans-line.na { background: var(--surface-2); }
.ans-line img { max-height: 120px; background: #fff; border-radius: 6px; }

/* ---------- Prosa (teoria, spiegazioni) */
.prose { font-size: 16.5px; line-height: 1.65; overflow-wrap: break-word; }
.prose h1 { font-size: 26px; margin: 8px 0 14px; }
.prose h2 { font-size: 21px; margin: 30px 0 10px; }
.prose h3 { font-size: 18px; margin: 22px 0 8px; }
.prose p { margin: 0 0 12px; }
.prose ul, .prose ol { padding-left: 22px; margin: 0 0 12px; }
.prose li { margin: 4px 0; }
.prose table { border-collapse: collapse; width: 100%; font-size: 14.5px; display: block; overflow-x: auto; margin: 12px 0; }
.prose th, .prose td { border: 1px solid var(--border); padding: 7px 10px; text-align: left; vertical-align: top; }
.prose th { background: var(--surface-2); }
.prose code { background: var(--surface-2); padding: 1px 5px; border-radius: 5px; font-size: .9em; }
.prose blockquote { margin: 12px 0; padding: 4px 14px; border-left: 3px solid var(--border); color: var(--text-2); }
.m.d { display: block; }
.prose .m.d, .ans .m.d, .explain .m.d { overflow-x: auto; overflow-y: hidden; padding: 4px 0; margin: 8px 0; }
.prose hr { border: 0; border-top: 1px solid var(--border); margin: 24px 0; }
.explain { font-size: 15.5px; line-height: 1.6; margin-top: 10px; }
.explain p { margin: 0 0 10px; }
.callout { border-radius: 14px; padding: 12px 16px 4px; margin: 14px 0; background: var(--surface-2); border-left: 4px solid var(--text-3); }
.callout-t { font-weight: 800; font-size: 14px; margin-bottom: 6px; }
.callout.attenzione { background: var(--warn-soft); border-color: var(--warn); }
.callout.esempio { background: var(--accent-soft); border-color: var(--accent); }
.callout.formula { background: color-mix(in srgb, #8b5cf6 10%, transparent); border-color: #8b5cf6; }
.callout.sintesi, .callout.esame { background: var(--ok-soft); border-color: var(--ok); }
.callout.esame::before { content: "All'esame"; display: block; font-weight: 650; font-size: 14px; color: var(--ok); margin-bottom: 4px; }
.callout.sintesi::before { content: "In sintesi"; display: block; font-weight: 650; font-size: 14px; color: var(--ok); margin-bottom: 4px; }
.callout.attenzione::before { content: "Attenzione"; display: block; font-weight: 650; font-size: 14px; color: var(--warn); margin-bottom: 4px; }
.theory-foot { position: sticky; bottom: calc(76px + var(--sab)); margin-top: 24px; display: flex; gap: 10px; }
@media (min-width: 900px) { .theory-foot { bottom: 16px; } }
.theory-foot .btn { box-shadow: 0 8px 24px rgb(15 23 41 / .18); white-space: nowrap; }
.btn { white-space: nowrap; }
.note { padding: 12px 14px; border-radius: 12px; background: var(--warn-soft); color: var(--text); font-size: 14px; }

/* ---------- Sheet, toast */
.sheet { position: fixed; inset: 0; z-index: 100; display: grid; align-items: end; background: rgb(0 0 0 / .35); animation: fade .15s; }
.sheet .panel {
  background: var(--surface); border-radius: 22px 22px 0 0; padding: 10px 16px calc(20px + var(--sab)); max-height: 85dvh; overflow: auto;
  animation: up .22s cubic-bezier(.2, .8, .2, 1); width: 100%; max-width: 560px; margin: 0 auto;
}
@media (min-width: 700px) { .sheet { align-items: center; } .sheet .panel { border-radius: 22px; } }
.sheet .grab { width: 40px; height: 5px; border-radius: 9px; background: var(--border); margin: 0 auto 12px; }
.sheet h3 { font-size: 18px; margin: 4px 4px 12px; }
@keyframes up { from { transform: translateY(40px); opacity: 0; } }
@keyframes fade { from { opacity: 0; } }
.toast {
  position: fixed; left: 50%; bottom: calc(96px + var(--sab)); transform: translateX(-50%); z-index: 200;
  background: var(--text); color: var(--bg); padding: 10px 18px; border-radius: 99px; font-weight: 600; font-size: 14px; box-shadow: var(--shadow);
}
.empty { text-align: center; padding: 40px 20px; color: var(--text-2); }
.empty svg { width: 44px; height: 44px; color: var(--text-3); margin-bottom: 8px; }
.chart { width: 100%; height: 150px; }
.chart .line { fill: none; stroke: var(--accent); stroke-width: 2.5; stroke-linejoin: round; stroke-linecap: round; }
.chart .area { fill: var(--accent-soft); }
.chart .thr { stroke: var(--ok); stroke-dasharray: 4 4; stroke-width: 1.5; }
.chart text { fill: var(--text-3); font-size: 11px; }
.chart circle { fill: var(--surface); stroke: var(--accent); stroke-width: 2; }
.chart circle.fail { stroke: var(--ko); }

/* ---------- Indizi, teoria nel runner, griglia, piano, ricerca */
.q-tools { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 12px; }
.q-tools .btn { min-height: 40px; font-size: 14px; }
.hints { list-style: none; margin: 12px 0 0; padding: 10px 14px; border-radius: 12px; background: var(--warn-soft); font-size: 15px; }
.hints li { margin: 4px 0; } .hints li + li { margin-top: 10px; } .hints b { display: block; font-size: 13px; font-weight: 650; color: var(--warn); }
.crit { list-style: none; padding: 0; margin: 8px 0 0; font-size: 14px; display: flex; flex-direction: column; gap: 2px; }
.crit .ok { color: var(--ok); } .crit .ko { color: var(--ko); }
.fix { display: flex; align-items: center; justify-content: space-between; gap: 10px; flex-wrap: wrap; margin-top: 10px; }
.review-item .snip { display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.review-item .snip .badge svg { width: 12px; height: 12px; }
.sheet.wide .panel { max-width: 820px; max-height: 92dvh; }
.theory-bar { display: flex; gap: 8px; align-items: center; position: sticky; top: -10px; background: var(--surface); padding: 6px 0; z-index: 1; }
.theory-bar select, .date, .search { flex: 1; min-width: 0; font: inherit; font-size: 16px; padding: 9px 12px; border-radius: 12px; border: 1px solid var(--border); background: var(--surface-2); color: var(--text); }
.date.block, .search { width: 100%; display: block; }
.today-h { display: flex; gap: 12px; align-items: center; }
.today-n { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; margin: 14px 0 10px; text-align: center; }
.today-n b { display: block; font-size: 24px; } .today-n span { font-size: 12.5px; color: var(--text-2); }
.today .actions { display: flex; gap: 8px; flex-wrap: wrap; }
button.link { color: var(--accent); font-weight: 600; padding: 0; }

/* ---------- Appunti sulla teoria: evidenziatore e penna */
:root { --hl-0: rgb(255 214 10 / .45); --hl-1: rgb(52 199 89 / .35); --hl-2: rgb(255 85 150 / .32); --hl-3: rgb(64 156 255 / .32); }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) { --hl-0: rgb(255 214 10 / .32); --hl-1: rgb(52 199 89 / .3); --hl-2: rgb(255 85 150 / .3); --hl-3: rgb(64 156 255 / .32); } }
:root[data-theme="dark"] { --hl-0: rgb(255 214 10 / .32); --hl-1: rgb(52 199 89 / .3); --hl-2: rgb(255 85 150 / .3); --hl-3: rgb(64 156 255 / .32); }
::highlight(hl-0) { background-color: var(--hl-0); }
::highlight(hl-1) { background-color: var(--hl-1); }
::highlight(hl-2) { background-color: var(--hl-2); }
::highlight(hl-3) { background-color: var(--hl-3); }
.hl-0, .hlq-0 { --sw: var(--hl-0); } .hl-1, .hlq-1 { --sw: var(--hl-1); } .hl-2, .hlq-2 { --sw: var(--hl-2); } .hl-3, .hlq-3 { --sw: var(--hl-3); }
.annotable { position: relative; }
canvas.ink { position: absolute; left: 0; top: 0; pointer-events: none; z-index: 2; touch-action: pan-x pan-y; }
canvas.ink.on { pointer-events: auto; cursor: crosshair; }
.annotable.annotating { outline: 2px dashed color-mix(in srgb, var(--accent) 35%, transparent); outline-offset: 4px; }
.btn.sm { min-height: 38px; padding: 0 14px; font-size: 14px; }
.btn.sm.on { background: var(--accent); color: #fff; }
.annot-bar {
  position: sticky; top: calc(8px + var(--sat)); z-index: 20; margin: 0 0 12px; padding: 10px 12px;
  display: flex; flex-wrap: wrap; align-items: center; gap: 10px 16px;
  background: color-mix(in srgb, var(--surface) 92%, transparent); backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--border); border-radius: 16px; box-shadow: var(--shadow);
}
@media (max-width: 899px) { .annot-bar { top: calc(60px + var(--sat)); } }
.annot-group { display: flex; align-items: center; gap: 8px; }
.annot-group + .annot-group { padding-left: 16px; border-left: 1px solid var(--border); }
.swatch { width: 32px; height: 32px; border-radius: 50%; background: var(--sw); border: 2px solid var(--border); flex: none; }
.swatch.ink { background: var(--c); border-color: var(--surface); box-shadow: 0 0 0 1px var(--border); }
.swatch.on { box-shadow: 0 0 0 2px var(--surface), 0 0 0 4px var(--accent); }
.annot-bar .tool { min-width: 38px; height: 38px; border-radius: 10px; display: grid; place-items: center; color: var(--text-2); background: var(--surface-2); }
.annot-bar .tool.on { background: var(--accent); color: #fff; }
.annot-bar .tool svg { width: 20px; height: 20px; }
.annot-bar .tool[data-act="penw"] { display: flex; flex-direction: column; justify-content: center; gap: 3px; padding: 0 9px; }
.annot-bar .tool[data-act="penw"] i { display: block; width: 20px; background: currentColor; border-radius: 4px; opacity: .45; }
.annot-bar .tool[data-act="penw"] i.on { opacity: 1; }
.annot-hint { flex-basis: 100%; margin: 0; font-size: 13px; color: var(--text-2); }
.hl-quote { margin: 0; padding: 10px 14px; border-radius: 12px; background: var(--sw); font-size: 15px; line-height: 1.5; }
.hl-dot { width: 12px; align-self: stretch; border-radius: 6px; background: var(--sw); flex: none; }
.hl-row .t { font-weight: 500; }
.lesson-head { display: flex; align-items: center; gap: 8px; margin-bottom: 8px; min-width: 0; }
.lesson-head .badge { overflow: hidden; text-overflow: ellipsis; min-width: 0; }
@media (max-width: 599px) {
  .annot-bar { gap: 8px 10px; padding: 8px 10px; }
  .annot-group + .annot-group { padding-left: 10px; }
  .annot-group { gap: 6px; }
  .swatch { width: 28px; height: 28px; }
  .annot-bar .tool { min-width: 34px; height: 34px; }
  .annot-hint { display: none; }
}

/* ---------- Rifiniture tipografiche */
.prose p, .prose li, .explain p { text-wrap: pretty; }
.prose h1 { letter-spacing: -.03em; }
.timer, .score .big, .today-n b, .ring text, .navgrid, .badge, .lnum { font-variant-numeric: tabular-nums; }
.row .t { font-weight: 550; }
.section-h h2 { font-weight: 650; letter-spacing: -.02em; }
/* evidenziatore a mano: niente selezione di testo né menu, anteprima nel colore scelto */
.annotable.marking { -webkit-user-select: none; user-select: none; -webkit-touch-callout: none; cursor: text; }
::highlight(hl-draft) { background-color: var(--hl-draft, var(--hl-0)); }

/* teoria aperta da una domanda: barra degli strumenti dentro il pannello, editor evidenziazione sopra */
#sheet2 { z-index: 110; }
.sheet .annot-bar { top: 44px; }
.theory-bar .btn.sm { flex: none; }
.trap-note { background: var(--warn-soft); border: 1px solid color-mix(in srgb, var(--warn) 40%, transparent); margin: 10px 0; }

.fs { position: fixed; inset: 0; z-index: 200; display: grid; place-items: center; padding: 24px; background: var(--bg); }
.fs-card { max-width: 420px; text-align: center; }
.fs-card h2 { font-size: 26px; margin: 12px 0 8px; }
.fs-card p { color: var(--text-2); margin: 0 0 22px; }
.fs-ico svg { width: 56px; height: 56px; color: var(--accent); }
.acc-form { display: grid; gap: 10px; }
.fs-card .search { display: block; width: 100%; text-align: left; }
.fs-card img { border-radius: 16px; }