/* Exam Studio — единая палитра (ТЗ §2.2) и оформление по сборке Build 12.3 */
:root {
  --cream: #F7F4E5;
  --card: #F7F4EF;
  --olive-soft: #CBD0B8;
  --olive: #526345;
  --olive-dark: #435338;
  --ink: #173D2C;
  --white: #FFFFFF;
  --field: #FFFDF9;
  --ink-2: #4A5F52;
  --ink-3: #6B7A70;
  --line: #D9DCC9;
  --bad: #8A3B2E;
  --bad-bg: #F5E4E0;
  --warn-bg: #F7EFD2;
  --shadow: 0 18px 50px rgba(82, 99, 69, .14);
  --shadow-sm: 0 6px 22px rgba(82, 99, 69, .10);
  --sans: Inter, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --serif: var(--sans);
}
* { box-sizing: border-box; }
button, input, textarea, select { font-family: inherit; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--cream); color: var(--ink); font: 16px/1.6 var(--sans); min-height: 100vh; }
h1, h2, h3 { font-weight: 800; line-height: 1.15; margin: 0 0 .5em; letter-spacing: -.02em; }
h1 { font-size: clamp(2rem, 4vw, 3.4rem); } h2 { font-size: 1.5rem; } h3 { font-size: 1.15rem; }
p { margin: 0 0 1em; }
a { color: var(--olive); text-underline-offset: 3px; }
a:hover { color: var(--ink); }
:focus-visible { outline: 3px solid var(--olive); outline-offset: 2px; border-radius: 8px; }
.muted { color: var(--ink-3); }
.small { font-size: .875rem; }
.eyebrow { font-size: .72rem; font-weight: 800; letter-spacing: .16em; text-transform: uppercase; color: var(--olive); margin-bottom: 10px; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
[hidden] { display: none !important; }

/* ---------- шапка ---------- */
.site-header { display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding: 18px clamp(16px, 4.5vw, 64px); background: var(--card); border-bottom: 1px solid var(--line); position: relative; z-index: 3; }
body.home .site-header { margin: 18px clamp(12px, 2.5vw, 34px) 0; border: 1px solid var(--line); border-radius: 28px; box-shadow: var(--shadow-sm); }
.logo { display: inline-flex; align-items: center; gap: 14px; text-decoration: none; color: var(--ink); font-size: 1.7rem; font-weight: 800; letter-spacing: -.03em; }
.logo-mark { width: 40px; height: 40px; border-radius: 50%; background: var(--olive); display: grid; place-items: center; flex: none; }
.logo-mark svg { width: 24px; height: 24px; }
.nav-links { display: flex; align-items: center; gap: 22px; }
.nav-links a.plain { color: var(--olive); text-decoration: none; font-weight: 800; }
.nav-links a.plain:hover { color: var(--ink); }

/* ---------- кнопки и поля ---------- */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 13px 24px; border-radius: 14px;
  border: 1.5px solid var(--olive); background: var(--olive); color: var(--white); font: 800 1rem var(--sans); cursor: pointer; text-decoration: none; }
.btn:hover { background: var(--olive-dark); border-color: var(--olive-dark); color: var(--white); }
.btn.ghost { background: var(--white); color: var(--ink); border-color: var(--line); }
.btn.ghost:hover { background: var(--field); border-color: var(--olive); color: var(--ink); }
.btn.small { padding: 8px 16px; font-size: .875rem; border-radius: 12px; }
.btn.danger { background: var(--bad-bg); color: var(--bad); border-color: var(--bad-bg); }
.btn.danger:hover { background: #EFD3CD; color: var(--bad); border-color: #EFD3CD; }
.btn.block { width: 100%; padding: 17px; font-size: 1.08rem; margin-top: 10px; }
.btn[disabled], .btn[aria-disabled="true"] { opacity: .5; cursor: not-allowed; pointer-events: none; }
label.field { display: block; margin-bottom: 14px; }
label.field > span { display: block; font-weight: 700; margin-bottom: 6px; }
input[type=text], input[type=password], input[type=number], select, textarea {
  width: 100%; padding: 15px 18px; border: 1.5px solid var(--olive-soft); border-radius: 16px; background: var(--field); color: var(--ink); font: inherit; }
input::placeholder, textarea::placeholder { color: var(--ink-3); }
input:focus, select:focus, textarea:focus { border-color: var(--olive); outline: none; box-shadow: 0 0 0 4px rgba(82, 99, 69, .16); }
textarea { min-height: 150px; resize: vertical; line-height: 1.55; }
.check { display: flex; gap: 12px; align-items: flex-start; margin: 12px 0; font-size: .95rem; }
.check input { margin-top: 4px; accent-color: var(--olive); width: 18px; height: 18px; flex: none; }
.error-msg { color: var(--bad); background: var(--bad-bg); border-radius: 14px; padding: 12px 16px; margin: 12px 0; font-size: .95rem; }
.info-msg { background: #E8EADB; border-radius: 14px; padding: 12px 16px; margin: 12px 0; font-size: .95rem; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 32px; padding: clamp(22px, 3.2vw, 40px); box-shadow: var(--shadow-sm); }

/* ---------- главная ---------- */
body.home { background-color: var(--cream);
  background-image: repeating-linear-gradient(90deg, var(--olive-soft) 0 23px, var(--cream) 23px 46px); background-attachment: fixed; }
.home-main { display: flex; justify-content: center; padding: clamp(24px, 6vh, 80px) 16px 70px; }
.start-card { width: min(720px, 100%); box-shadow: var(--shadow); border-radius: 40px; padding: clamp(26px, 4.5vw, 48px); }
.start-card h1 { margin-bottom: .35em; }
.start-card .lead { color: var(--ink-2); font-size: 1.1rem; }
.start-card input[type=text], .start-card input[type=password] { margin-bottom: 14px; }
.start-card .helper { font-size: .85rem; color: var(--ink-3); margin: 4px 0 14px; }
.start-card .btn.block[disabled] { background: var(--olive-soft); border-color: var(--olive-soft); color: var(--white); opacity: .9; }

/* ---------- экзамен ---------- */
body.exam-body { background: var(--cream); }
.exam-head { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 26px clamp(16px, 3.2vw, 46px) 6px; max-width: 1560px; margin: 0 auto; }
.exam-head .who { font-size: 1.7rem; font-weight: 800; letter-spacing: -.02em; }
.exam-head .eyebrow { margin: 0; color: var(--ink-2); }
.btn.finish { background: var(--bad-bg); border-color: var(--bad-bg); color: var(--bad); }
.btn.finish:hover { background: #EFD3CD; border-color: #EFD3CD; color: var(--bad); }
.exam-layout { display: grid; grid-template-columns: 290px minmax(0, 1fr); gap: 26px; padding: 18px clamp(16px, 3.2vw, 46px) 90px; max-width: 1560px; margin: 0 auto; align-items: start; }
.sidenav { position: sticky; top: 16px; }
.side-card { background: var(--card); border: 1px solid var(--line); border-radius: 32px; padding: 26px 22px; box-shadow: var(--shadow-sm); }
.timer-label { text-align: center; font-size: .72rem; font-weight: 800; letter-spacing: .16em; text-transform: uppercase; color: var(--ink-2); }
.timer { margin: 12px 0 10px; text-align: center; font: 800 2.15rem/1 var(--sans); font-variant-numeric: tabular-nums; letter-spacing: -.01em;
  padding: 20px 10px; border-radius: 22px; background: #E8EADB; color: var(--olive); }
.timer.warn { background: var(--warn-bg); color: #6B5410; }
.timer.crit { background: var(--bad-bg); color: var(--bad); }
.save-state { font-size: .8rem; color: var(--ink-3); min-height: 2.6em; }
.save-state.err { color: var(--bad); font-weight: 700; }
.progress { height: 10px; border-radius: 999px; background: #E8EADB; overflow: hidden; margin: 8px 0 18px; }
.progress div { height: 100%; background: var(--olive); width: 0; border-radius: 999px; }
.nav-group { margin: 16px 0 8px; font-size: .8rem; font-weight: 800; color: var(--ink-2); }
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip { position: relative; width: 44px; height: 44px; border-radius: 12px; border: 1.5px solid var(--line); background: var(--white); color: var(--olive);
  font: 600 1rem var(--sans); cursor: pointer; }
.chip:hover { border-color: var(--olive); }
.chip[aria-current="step"] { background: var(--olive); border-color: var(--olive); color: var(--white); }
.chip.done:not([aria-current="step"]) { background: #E8EADB; border-color: var(--olive-soft); }
.chip.done::after { content: "✓"; position: absolute; right: 3px; top: 0; font-size: .62rem; font-weight: 800; }
.chip.flag::before { content: ""; position: absolute; left: 4px; top: 4px; width: 7px; height: 7px; border-radius: 50%; background: var(--ink); }
.chip[aria-current="step"].flag::before { background: var(--white); }
.legend { font-size: .76rem; color: var(--ink-2); margin-top: 16px; }
.nav-toggle { display: none; }
.main-col { min-width: 0; }
.audio-card { margin-bottom: 20px; padding: 24px 28px; border-radius: 30px; }
.audio-row { display: flex; flex-wrap: wrap; align-items: center; gap: 16px; }
.audio-card .bar { flex: 1 1 200px; height: 8px; background: #E8EADB; border-radius: 999px; overflow: hidden; }
.audio-card .bar div { height: 100%; width: 0; background: var(--olive); }
.audio-note { font-size: .82rem; color: var(--ink-2); margin: 10px 0 0; }
.step-card { border-radius: 36px; padding: clamp(24px, 3.4vw, 44px); box-shadow: var(--shadow-sm); }
.step-card h1 { font-size: clamp(1.7rem, 3vw, 2.4rem); color: #243A2C; margin-bottom: .45em; }
.prompt { color: var(--ink-2); font-size: 1.05rem; line-height: 1.7; max-width: 100ch; white-space: pre-line; }
.sub { font-size: .85rem; color: var(--ink-3); margin: 18px 0 8px; }
.items { margin: 6px 0 4px; padding: 0 0 0 1.5em; line-height: 1.7; color: #2E4538; font-size: 1.05rem; }
.items li { padding: 3px 0 3px 4px; }
.passages p { margin: 0 0 12px; font-size: 1.05rem; }
.passages b { color: var(--olive); margin-right: 6px; }
.reading-box { background: var(--field); border: 1px solid var(--line); border-radius: 22px; padding: 26px 30px; margin: 20px 0 28px;
  font: 1.06rem/1.85 var(--serif); color: #24332B; }
.reading-box h2 { text-align: center; font-family: var(--serif); font-size: 1.3rem; font-weight: 700; margin-bottom: 18px; letter-spacing: 0; }
.reading-box p { margin: 0 0 1.1em; }
.reading-box p:last-child { margin-bottom: 0; }
.tag { display: inline-block; white-space: nowrap; font: 800 .82rem var(--sans); color: var(--olive); background: #E8EADB; border-bottom: 2px solid var(--olive-soft); border-radius: 6px; padding: 0 6px 1px; margin: 0 2px; }
.q { padding: 18px 0; border-bottom: 1px solid var(--line); }
.q:last-of-type { border-bottom: 0; }
.q .qt { font-weight: 800; margin-bottom: 8px; color: var(--ink); }
.q .opts { margin: 0 0 12px; color: #2E4538; line-height: 1.8; }
.q .opts div { padding-left: 12px; }
.digit { width: 60px; height: 56px; text-align: center; border: 1.5px solid var(--olive-soft); border-radius: 16px; background: var(--field);
  font: 700 1.5rem var(--sans); color: var(--ink); padding: 0; }
.digit:focus { border-color: var(--olive); box-shadow: 0 0 0 4px rgba(82, 99, 69, .16); outline: none; }
input.word { max-width: 340px; height: 56px; }
.answer-wrap { overflow-x: auto; margin: 6px 0 4px; padding: 4px 2px 8px; }
.digits-row { display: flex; gap: 14px; flex-wrap: nowrap; }
.dcol { display: flex; flex-direction: column; align-items: center; gap: 8px; font-weight: 800; font-size: .85rem; color: var(--ink-2); }
.hint { font-size: .8rem; color: var(--ink-3); margin: 8px 0 0; }
.mark-btn { margin-top: 26px; background: var(--white); color: var(--olive); border: 1.5px solid var(--line); border-radius: 14px; padding: 13px 22px; font: 800 1rem var(--sans); cursor: pointer; }
.mark-btn:hover { border-color: var(--olive); }
.mark-btn[aria-pressed="true"] { background: #E8EADB; border-color: var(--olive); }
.step-nav { display: flex; justify-content: space-between; gap: 12px; margin-top: 22px; }
.letter { max-width: 900px; margin: 18px auto; background: var(--field); border: 1px solid var(--line); border-radius: 24px; padding: clamp(18px, 3vw, 36px); font-size: 1.08rem; line-height: 1.65; }
.letter h2 { font-size: 1.4rem; letter-spacing: 0; }
.letter table { width: 100%; border-collapse: collapse; margin: 16px 0 0; }
.letter td { border: 1px solid var(--olive-soft); padding: 10px 14px; }
.letter .quote { border: 1px solid var(--olive-soft); border-top: 0; padding: 14px 18px; font-style: italic; }
.letter .quote p { margin: 0 0 .7em; }
.paper { background: #FAF9F1; border: 1px solid var(--line); border-radius: 22px; padding: 22px 24px; margin-top: 22px; }
.paper h3 { margin-bottom: .3em; }
.paper p { margin: 0; font-size: .9rem; color: var(--ink-2); }
.variants { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin: 18px 0; }
.vopt { display: flex; gap: 12px; align-items: center; padding: 18px 20px; border: 1.5px solid var(--line); border-radius: 20px; cursor: pointer; background: var(--field); font-weight: 700; }
.vopt:has(input:checked) { border-color: var(--olive); background: #E8EADB; }
.vopt input { accent-color: var(--olive); width: 18px; height: 18px; }
.notice { background: var(--warn-bg); border: 1px solid #E8DDB0; border-radius: 14px; padding: 14px 18px; font-size: .92rem; margin: 14px 0; }
.survey { width: 100%; border-collapse: collapse; margin: 12px 0 18px; }
.survey th, .survey td { border: 1px solid var(--olive-soft); padding: 9px 12px; text-align: left; }
.survey th { background: #EFEFDD; text-align: center; }
.survey td:last-child { text-align: center; }
.pie-wrap { display: flex; flex-wrap: wrap; gap: 24px; align-items: center; margin: 14px 0 20px; }
.pie-legend { list-style: none; margin: 0; padding: 0; }
.pie-legend li { display: flex; gap: 10px; align-items: center; padding: 3px 0; }
.pie-legend i { width: 14px; height: 14px; border-radius: 4px; flex: none; }
.plan { padding-left: 1.3em; margin: 6px 0 14px; }
dialog { border: 1px solid var(--line); border-radius: 28px; background: var(--card); color: var(--ink); padding: 30px; max-width: min(500px, 92vw); box-shadow: var(--shadow); }
dialog::backdrop { background: rgba(23, 61, 44, .38); }
dialog h2 { font-size: 1.35rem; }
.dialog-actions { display: flex; gap: 12px; flex-wrap: wrap; justify-content: flex-end; margin-top: 20px; }
.finish-wrap { display: flex; justify-content: center; padding: 8vh 16px; }
.finish-card { width: min(600px, 100%); text-align: center; border-radius: 40px; box-shadow: var(--shadow); }
.tick { width: 72px; height: 72px; border-radius: 50%; background: #E8EADB; color: var(--olive); display: grid; place-items: center; font-size: 2.2rem; font-weight: 800; margin: 0 auto 18px; }
.overlay { position: fixed; inset: 0; background: rgba(247, 244, 229, .97); z-index: 50; display: flex; align-items: center; justify-content: center; padding: 20px; }

/* ---------- кабинет преподавателя ---------- */
.t-wrap { max-width: 1240px; margin: 0 auto; padding: 26px clamp(14px, 3vw, 36px) 90px; }
.tabs { display: flex; gap: 8px; margin-bottom: 22px; flex-wrap: wrap; }
.tab { padding: 11px 22px; border-radius: 14px; border: 1.5px solid var(--line); background: var(--white); color: var(--ink); font: 800 .95rem var(--sans); cursor: pointer; }
.tab[aria-selected="true"] { background: var(--olive); border-color: var(--olive); color: var(--white); }
.table-wrap { overflow-x: auto; }
table.list { border-collapse: collapse; width: 100%; background: var(--white); border-radius: 18px; overflow: hidden; border: 1px solid var(--line); }
table.list th, table.list td { text-align: left; padding: 12px 16px; border-bottom: 1px solid #ECEEDF; vertical-align: top; }
table.list th { background: var(--card); font-size: .75rem; text-transform: uppercase; letter-spacing: .08em; color: var(--ink-2); }
table.list tr:last-child td { border-bottom: 0; }
.pill { display: inline-block; padding: 3px 12px; border-radius: 999px; font-size: .8rem; font-weight: 800; background: #E8EADB; }
.pill.bad { background: var(--bad-bg); color: var(--bad); }
.pill.warn { background: var(--warn-bg); }
.pill.plain { background: var(--card); border: 1px solid var(--line); }
.grid2 { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 22px; margin-bottom: 22px; }
.score-row { display: grid; grid-template-columns: 1fr auto; gap: 8px; padding: 8px 0; border-bottom: 1px solid var(--line); }
.score-row:last-child { border-bottom: 0; }
.score-row.total { font-weight: 800; }
.crit { display: grid; grid-template-columns: 1fr 90px; gap: 10px; align-items: center; margin: 8px 0; }
.crit input { text-align: center; padding: 10px; }
.mis { background: var(--bad-bg); color: var(--bad); border-radius: 6px; padding: 0 5px; font-weight: 800; }
.cellchips span { display: inline-block; margin: 0 5px 2px 0; white-space: nowrap; }
.code-reveal { font: 800 1.5rem/1.3 var(--sans); letter-spacing: .06em; background: var(--white); border: 2px dashed var(--olive); border-radius: 18px; padding: 16px 20px; margin: 12px 0; user-select: all; word-break: break-all; }
.row { display: flex; gap: 14px; flex-wrap: wrap; align-items: end; }
.row > * { flex: 1 1 200px; }
.row > .btn { flex: 0 0 auto; }
.t-wrap .start-card { margin: 0 auto; }

/* ---------- адаптивность ---------- */
@media (max-width: 1000px) {
  .exam-layout { grid-template-columns: 1fr; gap: 14px; }
  .sidenav { position: static; }
  .nav-toggle { display: inline-flex; margin-bottom: 10px; }
  .sidenav.collapsed .side-card { display: none; }
  .variants { grid-template-columns: 1fr; }
  .exam-head .who { font-size: 1.3rem; }
}
@media (max-width: 560px) {
  .site-header { padding: 14px 16px; }
  .logo { font-size: 1.35rem; }
  .nav-links { gap: 12px; }
  .digit { width: 48px; height: 50px; }
  .digits-row { gap: 8px; }
  .reading-box { padding: 18px; }
}
@media (prefers-reduced-motion: no-preference) { .progress div { transition: width .2s; } }
@media print { .sidenav { display: none; } }

/* Экзамен: текст заданий нельзя выделить и скопировать; поля ввода работают как обычно */
body.exam-body { -webkit-user-select: none; user-select: none; -webkit-touch-callout: none; }
body.exam-body input, body.exam-body textarea { -webkit-user-select: text; user-select: text; }
@media print { body.exam-body #app { display: none !important; } }