body { background: var(--sand); min-height: 100vh; display: flex; flex-direction: column; }
main { flex: 1; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.eyebrow { font-size: 13px; font-weight: 600; letter-spacing: .06em; text-transform: uppercase; color: var(--ocean-2); margin-bottom: 10px; }

/* Barra */
.bar { background: var(--deep); color: #fff; display: flex; align-items: center; justify-content: space-between; padding: 0 24px; height: 56px; }
.bar-right { display: flex; align-items: center; gap: 18px; }
.bar-link { color: var(--on-dark); font-size: 14px; text-decoration: none; }
.bar-link:hover { color: #fff; }
.pill { font-size: 12px; font-weight: 500; border: 1px solid rgb(255 255 255 / .4); color: var(--on-dark); border-radius: 999px; padding: 3px 10px; }

/* Setup */
.setup { max-width: var(--container); margin: 0 auto; padding: 72px var(--gutter) 96px; }
.setup-grid { display: grid; grid-template-columns: 1.1fr 1fr; gap: 56px; align-items: start; }
.lead { font-size: 19px; max-width: 54ch; }
.card { background: var(--paper); border: 1px solid var(--brand); border-radius: var(--radius); padding: 28px; }
.setup-form fieldset { border: 0; padding: 0; margin: 0 0 22px; }
.setup-form legend { font-weight: 600; font-size: 16px; margin-bottom: 10px; color: var(--ink); }
.setup-form .opt { font-weight: 400; color: var(--muted); }
.pills { display: flex; gap: 8px; flex-wrap: wrap; }
.pills button { border: 1px solid var(--ocean); color: var(--ocean); background: transparent; border-radius: 999px; padding: 8px 16px; font-weight: 500; transition: background-color .15s, color .15s; }
.pills button[aria-checked="true"] { background: var(--ocean); color: #fff; }
select, input[type="text"], textarea { width: 100%; padding: 12px 14px; border: 1px solid var(--line); border-radius: var(--radius-s); background: var(--paper); }
select:focus, input:focus, textarea:focus { border-color: var(--ocean); outline: none; box-shadow: 0 0 0 3px var(--sky-tint); }
.free { margin-top: 10px; }
.free summary { cursor: pointer; color: var(--ocean); font-size: 14px; font-weight: 500; }
.free input { margin-top: 10px; }
.check { display: flex; gap: 10px; align-items: center; font-size: 14px; margin: 4px 0 20px; color: var(--ink); }
.check input { width: 18px; height: 18px; accent-color: var(--brand); }
#startBtn { width: 100%; justify-content: center; }
.setup-form .small { color: var(--muted); margin: 14px 0 0; }
.notice { border-left: 3px solid var(--brand); background: var(--paper); padding: 14px 16px; margin: 18px 0; color: var(--ink); border-radius: 0 var(--radius-s) var(--radius-s) 0; }
.notice.soft { border-left-color: var(--sky); color: var(--muted); }

/* Lezione */
.lesson { display: grid; grid-template-columns: minmax(0, 1fr) 380px; gap: 24px; max-width: 1400px; margin: 0 auto; padding: 24px var(--gutter) 40px; min-height: calc(100vh - 56px); }
.boardWrap { min-width: 0; display: flex; flex-direction: column; gap: 18px; }
.boardHead { display: flex; justify-content: space-between; align-items: flex-end; gap: 24px; flex-wrap: wrap; }
.boardHead h2 { font-size: 28px; margin: 0; }
.boardHead .eyebrow { margin-bottom: 4px; }
.stepper { list-style: none; display: flex; gap: 6px; padding: 0; margin: 0; }
.stepper li { font-size: 13px; font-weight: 500; color: var(--muted); border: 1px solid var(--line); border-radius: 999px; padding: 5px 12px; background: var(--paper); }
.stepper li.active { border-color: var(--gesso); color: var(--ink); background: var(--brand-tint); }
.stepper li.done { color: var(--ocean); border-color: var(--sky); }

.boardFrame { background: var(--paper); border: 1px solid var(--sky); border-radius: var(--radius); overflow: hidden; }
.pager { display: inline-flex; align-items: center; gap: 8px; }
.pager button { border: 0; background: transparent; color: var(--ocean); font-size: 11px; padding: 2px 6px; border-radius: 4px; line-height: 1; }
.pager button:hover:not(:disabled) { background: var(--brand-tint); }
.pager button:disabled { opacity: .3; cursor: default; }
.boardTop { display: flex; justify-content: space-between; padding: 8px 16px; font-size: 12px; font-weight: 600; letter-spacing: .06em; text-transform: uppercase; color: var(--ocean-2); border-bottom: 1px solid var(--line-soft); background: var(--sky-tint); }
.board { position: relative; min-height: 520px; padding: 28px 32px; font-size: 19px; line-height: 1.5;
  background-image: linear-gradient(var(--line-soft) 1px, transparent 1px), linear-gradient(90deg, var(--line-soft) 1px, transparent 1px);
  background-size: 28px 28px; background-position: -1px -1px; }
.board:empty::before { content: "La lavagna è vuota. La Prof. Ada sta per iniziare…"; color: var(--muted); font-size: 16px; }
.bi { margin: 0 0 16px; max-width: 720px; animation: bi-in .18s ease-out; }
@keyframes bi-in { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: none; } }
.bi-title { font-family: var(--font-display); font-size: 32px; font-weight: 600; letter-spacing: -.01em; color: var(--board); border-bottom: 4px solid var(--gesso); display: inline-block; padding-bottom: 4px; margin-bottom: 22px; }
.bi-text { color: var(--ink); }
.bi-text strong { color: var(--ocean); }
.bi-math { font-size: 24px; padding: 10px 0; color: var(--ink); overflow-x: auto; }
.bi-math .katex-display { margin: 0; text-align: left; }
.bi-list ul { margin: 0; padding-left: 22px; }
.bi-list li { margin: 4px 0; }
.bi-example { border: 1px solid var(--brand); background: var(--paper); border-radius: var(--radius-s); padding: 12px 16px; position: relative; }
.bi-example::before { content: "Esempio"; position: absolute; top: -10px; left: 12px; background: var(--paper); color: var(--ocra); font-size: 12px; font-weight: 600; letter-spacing: .06em; text-transform: uppercase; padding: 0 6px; }
.bi-svg svg { width: 100%; max-width: 520px; height: auto; display: block; }
.bi-correct { border-left: 4px solid var(--ocean); padding-left: 12px; }
.katex { font-size: 1.05em; }

.exercises { background: var(--paper); border: 1px solid var(--brand); border-radius: var(--radius); padding: 22px 24px; }
.exHead { display: flex; justify-content: space-between; align-items: baseline; gap: 16px; flex-wrap: wrap; }
.exHead h3 { margin: 0; }
.exHead .small { margin: 0; }
.exList { display: grid; gap: 14px; margin: 16px 0 18px; }
.ex { display: grid; grid-template-columns: 36px 1fr; gap: 12px; align-items: start; }
.ex .n { width: 36px; height: 36px; border-radius: 50%; background: var(--ocean); color: #fff; display: grid; place-items: center; font-weight: 600; }
.ex .q { margin: 6px 0 8px; color: var(--ink); font-size: 17px; }
.ex textarea { min-height: 52px; resize: vertical; }
.ex textarea:disabled { background: var(--sand); }
.exActions { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; }
.finished { background: var(--paper); border: 1px solid var(--sky); border-radius: var(--radius); padding: 22px 24px; }

/* Pannello tutor */
.panel { display: flex; flex-direction: column; gap: 14px; background: var(--paper); border: 1px solid var(--sky); border-radius: var(--radius); padding: 18px; position: sticky; top: 16px; max-height: calc(100vh - 32px); }
.tutorCard { display: flex; align-items: center; gap: 12px; }
.avatar { width: 46px; height: 46px; border-radius: 50%; background: var(--ocean); color: #fff; display: grid; place-items: center; font-weight: 700; font-size: 20px; }
.tutorMeta { display: flex; flex-direction: column; flex: 1; min-width: 0; }
.tutorMeta strong { color: var(--ink); }
.state { font-size: 13px; color: var(--muted); }
.bars { display: flex; gap: 3px; align-items: flex-end; height: 22px; width: 26px; }
.bars i { flex: 1; background: var(--sky); border-radius: 2px; height: 30%; transition: height .15s; }
.speaking .bars i { background: var(--gesso); animation: bar .9s ease-in-out infinite; }
.speaking .bars i:nth-child(2) { animation-delay: .15s; } .speaking .bars i:nth-child(3) { animation-delay: .3s; } .speaking .bars i:nth-child(4) { animation-delay: .45s; }
@keyframes bar { 0%, 100% { height: 30%; } 50% { height: 100%; } }
.listening .avatar { box-shadow: 0 0 0 4px var(--brand-tint), 0 0 0 6px var(--gesso); }
.transcript { flex: 1; overflow-y: auto; min-height: 160px; display: flex; flex-direction: column; gap: 8px; padding-right: 4px; font-size: 15px; }
.msg { padding: 9px 12px; border-radius: 10px; max-width: 95%; line-height: 1.45; }
.msg.tutor { background: var(--sky-tint); color: var(--ink); align-self: flex-start; }
.msg.student { background: var(--brand-tint); color: var(--ink); align-self: flex-end; }
.msg.system { color: var(--muted); font-size: 13px; align-self: center; text-align: center; }
.msg.live { outline: 1px dashed var(--sky); }
.quick { display: flex; flex-wrap: wrap; gap: 6px; }
.quick button { font-size: 13px; border: 1px solid var(--line); background: var(--paper); border-radius: 999px; padding: 6px 11px; color: var(--ocean); font-weight: 500; transition: border-color .15s, background-color .15s; }
.quick button:hover { border-color: var(--ocean); background: var(--sky-tint); }
.ask { display: grid; grid-template-columns: 48px 1fr 44px 44px; gap: 8px; align-items: center; }
.ask input { padding: 12px; }
.mic, .send { height: 46px; border-radius: var(--radius-s); border: 1px solid var(--ocean); background: var(--paper); color: var(--ocean); display: grid; place-items: center; transition: background-color .15s, color .15s; }
.mic:hover, .send:hover { background: var(--sky-tint); }
.mic[aria-pressed="true"] { background: var(--gesso); border-color: var(--gesso); color: var(--ink); }
.controls { display: flex; justify-content: space-between; align-items: center; gap: 10px; }
.controls .btn { white-space: nowrap; }
.controls .small { color: var(--muted); }

.toast { position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%); background: var(--ocean); color: #fff; padding: 12px 18px; border-radius: var(--radius-s); font-size: 15px; max-width: min(92vw, 560px); z-index: 10; }

@media (max-width: 980px) {
  .setup-grid { grid-template-columns: 1fr; gap: 32px; }
  .setup { padding: 40px var(--gutter) 56px; }
  .lesson { grid-template-columns: 1fr; padding: 16px; min-height: 0; }
  .panel { position: static; max-height: none; order: 2; }
  .transcript { max-height: 220px; }
  .board { min-height: 320px; padding: 20px 18px; font-size: 17px; background-size: 24px 24px; }
  .bi-title { font-size: 24px; }
  .bi-math { font-size: 20px; }
  .boardHead h2 { font-size: 22px; }
  .stepper li { font-size: 12px; padding: 4px 9px; }
  .bar { padding: 0 16px; }
  .bar-link { display: none; }
}

.small-pills { margin-top: 10px; }
.small-pills button { font-size: 13px; padding: 5px 12px; }
.notice a { color: var(--ocean); font-weight: 600; }
.meta { display: flex; justify-content: space-between; gap: 10px; color: var(--muted); flex-wrap: wrap; }
.env { display: inline-flex; align-items: center; gap: 6px; }
.env::before { content: ""; width: 8px; height: 8px; border-radius: 50%; background: var(--sky); }
.env.quiet::before { background: var(--ocean); }
.env.noisy::before { background: var(--matita); }
.report { background: var(--paper); border: 1px solid var(--brand); border-radius: var(--radius); padding: 22px 24px; }
.reportHead { display: flex; justify-content: space-between; align-items: flex-start; gap: 16px; flex-wrap: wrap; }
.reportHead h3 { margin: 0; }
.report .scores { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; margin: 16px 0; }
.report .score { border: 1px solid var(--line); border-radius: var(--radius-s); padding: 10px 12px; }
.report .score b { display: block; font-size: 13px; color: var(--ocean-2); text-transform: uppercase; letter-spacing: .05em; margin-bottom: 4px; }
.report .stars { color: var(--ocra); letter-spacing: 3px; font-size: 16px; }
.report h4 { margin: 14px 0 6px; font-size: 16px; color: var(--ocean); }
.report ul { margin: 0; padding-left: 20px; }
.report table { width: 100%; border-collapse: collapse; font-size: 15px; }
.report td, .report th { text-align: left; padding: 6px 8px; border-bottom: 1px solid var(--line-soft); }
.report .stat { font-size: 14px; color: var(--muted); }
@media (max-width: 720px) { .report .scores { grid-template-columns: 1fr; } }

.photoPrompt { background: var(--paper); border: 1px solid var(--brand); border-radius: var(--radius); padding: 18px 22px; display: flex; justify-content: space-between; align-items: center; gap: 18px; flex-wrap: wrap; }
.photoPrompt h3 { margin: 0 0 4px; } .photoPrompt .small { margin: 0; color: var(--muted); }
.msg.photo img { display: block; max-width: 220px; max-height: 160px; border-radius: 6px; border: 1px solid var(--brand); margin-top: 6px; }