:root{--bg:#f2efe6;--surface:#faf8f0;--text:#303729;--muted:#626b58;--accent:#455c37;--border:#d4d8c8}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font:16px/1.6 system-ui,sans-serif}header{max-width:1100px;margin:auto;padding:24px;display:flex;align-items:center;justify-content:space-between;gap:16px}a{color:var(--accent);text-underline-offset:4px}.brand{font-size:26px;font-weight:750;text-decoration:none}nav{display:flex;align-items:center;gap:20px}main{max-width:1000px;margin:32px auto;padding:0 24px 60px}.card{padding:32px;border:1px solid var(--border);border-radius:24px;background:var(--surface);margin-bottom:24px}.auth{max-width:500px;margin:40px auto}h1{font-size:30px;line-height:1.2;margin:0 0 24px}h2{font-size:21px;margin-top:0}.eyebrow{color:var(--muted)}.field{margin:20px 0}label{display:block;font-weight:600;margin:12px 0 8px}input,select{width:100%;font:inherit;min-height:48px;padding:12px 16px;border:1px solid var(--border);border-radius:16px;background:var(--bg);color:var(--text)}button,.button{display:inline-flex;justify-content:center;align-items:center;min-height:48px;border:1px solid transparent;border-radius:16px;padding:12px 20px;font:600 16px/1.4 system-ui;cursor:pointer;text-decoration:none}.primary{background:var(--accent);color:#fff}.auth .primary{width:100%;margin-top:16px}.outline{background:transparent;border-color:var(--border);color:var(--accent)}button:hover,.button:hover{filter:brightness(.93)}button:active,.button:active{filter:brightness(.85)}:focus-visible{outline:3px solid var(--accent);outline-offset:4px}.hint,small{font-size:14px;color:var(--muted)}.hint ul{padding-left:20px}.error,.errorlist{color:#8a2828;font-size:14px}.error{border-left:3px solid;padding-left:12px}.notice{padding:16px;border:1px solid var(--accent);border-radius:16px}.grid{display:grid;grid-template-columns:1fr 1fr;gap:24px}.row{display:flex;justify-content:space-between;align-items:center;gap:12px;margin:16px 0}.switch{margin:24px 0 0}p,small{overflow-wrap:anywhere}@media(max-width:650px){header{padding:16px}nav{gap:10px;flex-wrap:wrap}main{margin:16px auto;padding:0 16px 32px}.card{padding:24px}.auth{margin:16px auto}.grid{grid-template-columns:1fr;gap:0}h1{font-size:26px}.row{flex-wrap:wrap}}

main:has(.workspace){max-width:1320px}.workspace{display:grid;grid-template-columns:240px minmax(0,1fr);gap:32px}.sidebar{padding:20px 0}.sidebar nav{display:flex;flex-direction:column;align-items:stretch;gap:8px}.sidebar nav a,.filters a{padding:12px 16px;border-radius:18px;text-decoration:none;min-height:48px;display:flex;align-items:center;overflow-wrap:anywhere}.sidebar nav a:hover,.filters a:hover{background:#e6e9dd}.sidebar [aria-current],.filters [aria-current]{background:#dfe4d3;font-weight:700}.workspace-content{min-width:0}.actions,.filters{display:flex;flex-wrap:wrap;gap:12px}.filters{margin-bottom:24px}.row h1,.row h2{margin-bottom:0}.sidebar .hint{margin-top:32px}.workspace .grid{grid-template-columns:repeat(2,minmax(0,1fr))}@media(max-width:900px){.workspace{grid-template-columns:1fr;gap:16px}.sidebar{padding:0}.sidebar nav{flex-direction:row;flex-wrap:wrap}.sidebar .hint{display:none}.workspace .grid{grid-template-columns:1fr}}

textarea{width:100%;font:inherit;padding:14px 16px;background:var(--bg);color:var(--text);border:1px solid var(--border);border-radius:16px;resize:vertical;margin-bottom:16px}input[type=checkbox]{width:24px;min-height:24px}.count-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(100px,1fr));gap:16px}.condition{font:18px/1.7 Arial,sans-serif;overflow-wrap:anywhere;min-width:0;overflow-x:auto}.condition img{display:block;max-width:100%;height:auto;margin:20px auto}.condition table{border-collapse:collapse;max-width:100%;margin:20px 0}.condition td,.condition th{border:1px solid var(--border);padding:8px}.condition math{font-size:1.1em}.condition pre,.answer-key,.code{white-space:pre-wrap;overflow-wrap:anywhere}.answer-key{font:inherit}.code{font:15px/1.6 ui-monospace,monospace}.task-files{margin:20px 0}.task-files a{overflow-wrap:anywhere;max-width:100%}.task-nav{display:flex;flex-wrap:wrap;gap:10px;margin:24px 0}.task-nav a{min-width:48px;min-height:48px;border:1px solid var(--border);border-radius:24px;padding:10px;text-align:center;text-decoration:none}.task-nav .answered{background:#455047;color:white}.task-nav .correct{background:#e2efdc;color:#285c31;border-color:#397345}.task-nav .incorrect{background:#fae4df;color:#8a2828;border-color:#a14c40}.task-nav [aria-current]{outline:3px solid var(--accent);outline-offset:3px}progress{display:block;width:100%;height:14px;accent-color:#397345;margin:12px 0 24px;border:0;border-radius:16px;overflow:hidden}progress::-webkit-progress-bar{background:#e4e5dc}progress::-webkit-progress-value{background:#397345}.workspace-content>form>.primary{margin-bottom:24px}

.count-grid{display:block}.count-grid>div{display:grid;grid-template-columns:minmax(0,1fr) 96px;align-items:center;gap:12px;margin:12px 0;padding:12px 16px;border:1px solid var(--border);border-radius:20px}.count-grid label{margin:0}.count-grid .errorlist{grid-column:1/-1}

.exam-points{font-size:40px;line-height:1.2;font-weight:750;color:var(--accent);margin:20px 0 8px}#timer{font-variant-numeric:tabular-nums;font-size:24px}#attempt-monitor{background:var(--surface)}#save-status{margin-bottom:0}
/* Выбранное оформление №3: бумага, оливковый, спокойная боковая навигация. */
:root{--bg:#f2efe6;--surface:#faf8f0;--accent:#455c37} .app-header{max-width:none;height:96px;padding:20px 36px;border-bottom:1px solid var(--border)}.brand{display:flex;align-items:center;gap:12px;letter-spacing:-1px}.brand-mark{display:grid;place-items:center;background:var(--accent);color:var(--surface);width:42px;height:42px;border-radius:14px;font-size:28px}.course-label{font-size:13px;color:var(--muted);letter-spacing:.05em}.app-sidebar{position:fixed;top:96px;bottom:0;left:0;width:270px;border-right:1px solid var(--border);padding:20px 18px;display:flex;flex-direction:column;overflow:auto;background:var(--bg)}.app-sidebar .sidebar{padding:0}.sidebar .eyebrow{font-size:11px;letter-spacing:.18em;margin:16px 14px 26px;text-transform:uppercase}.sidebar nav a{min-height:56px;border-radius:22px;padding:14px 18px;font-size:16px;color:var(--muted)}.sidebar nav [aria-current]{color:var(--accent);background:#dfe4d3}.sidebar-profile{display:flex;align-items:center;gap:12px;margin-top:auto;padding:28px 8px 16px;border-top:1px solid var(--border)}.sidebar-profile small{display:block;font-size:12px}.avatar{width:42px;height:42px;flex-shrink:0;display:grid;place-items:center;background:#e3e8d8;color:var(--accent);border-radius:50%;font-weight:700}.account-actions{display:flex;align-items:center;justify-content:space-between;gap:8px;font-size:12px}.account-actions button{font-size:12px;padding:8px 14px;min-height:40px}.signed-in>main{margin:0 0 0 270px;max-width:1420px;padding:44px 48px 64px}.eyebrow{font-size:12px;letter-spacing:.12em;text-transform:uppercase}h1{font-size:36px;letter-spacing:-1px}h2{letter-spacing:-.4px}.card{border-radius:24px}.button,button{border-radius:20px}.board-hero{display:flex;align-items:center;justify-content:space-between;gap:24px;background:#e6e9d6;padding:36px;border-radius:24px;margin:24px 0 32px}.board-hero h2{font-size:30px;margin-bottom:28px}.board-hero .button{gap:24px}.hero-sketch{max-width:300px;width:40%;padding:18px;background:var(--surface);border:1px solid var(--border);border-radius:20px;transform:rotate(-3deg);color:var(--accent)}.hero-sketch svg{display:block;width:100%}.hero-sketch>span{font-family:Georgia,serif;font-style:italic;font-size:24px}.dashboard-links .card{min-height:180px;display:flex;flex-direction:column;align-items:flex-start;justify-content:space-between}.signed-in>main:has(#board-root){margin-left:0;padding:0 16px 16px;max-width:none}.signed-in:has(#board-root)>.app-sidebar{display:none}.bank-topics{display:grid;gap:14px}.bank-topic{display:flex;align-items:center;gap:20px;padding:24px;border:1px solid var(--border);border-radius:24px;text-decoration:none;background:var(--surface)}.bank-topic b{min-width:52px;font-size:24px}.bank-topic small{display:block}.bank-topic:hover{border-color:var(--accent)}details summary{cursor:pointer;color:var(--accent);font-weight:600;padding:12px 0}button:disabled{opacity:.55;cursor:default}@media(max-width:1050px){.app-sidebar{width:230px}.signed-in>main{margin-left:230px;padding:30px 24px}.sidebar nav a{font-size:14px;padding:12px}.board-hero{padding:24px}.board-hero h2{font-size:25px}}@media(max-width:750px){.app-header{height:80px;padding:16px 20px}.app-sidebar{position:static;width:auto;border-right:0;border-bottom:1px solid var(--border);padding:12px 16px}.app-sidebar .sidebar nav{display:flex;flex-direction:row;flex-wrap:wrap;gap:6px}.sidebar nav a{min-height:44px}.sidebar .eyebrow{margin:4px 8px 12px}.sidebar-profile{margin-top:12px;padding:12px 8px;border-top:0}.account-actions{padding:0 8px}.signed-in>main{margin:0;padding:24px 16px 40px}h1{font-size:28px}.hero-sketch{display:none}.grid{grid-template-columns:1fr}.board-hero{margin-top:16px}.course-label{font-size:11px}}
.python-editor{border:1px solid var(--border);border-radius:16px;overflow:hidden;margin:16px 0}.python-editor .cm-editor{max-height:440px}.code-output{white-space:pre-wrap;overflow-wrap:anywhere;font:14px/1.6 ui-monospace,monospace;background:#eeeee3;padding:16px;border-radius:16px;min-height:64px}.homework-code{margin-bottom:24px}.homework-code .actions{margin-top:16px}[hidden]{display:none!important}
.sidebar nav a{gap:14px}.nav-icon{flex-shrink:0}
.app-header{position:sticky;top:0;z-index:20;background:var(--bg)}
 .account-actions{justify-content:flex-start;flex-wrap:wrap;gap:8px 12px}.account-actions form{margin-left:auto}

.preparation-heading,.preparation-section-heading{display:flex;align-items:center;justify-content:space-between;gap:20px}.preparation-heading{margin-bottom:24px}.preparation-heading h1{margin-bottom:4px}.preparation-section-heading h2{margin:0}.selection-count{display:grid;place-items:center;min-width:42px;height:42px;padding:0 12px;border-radius:21px;background:#e3e8d8;color:var(--accent);font-weight:750;font-variant-numeric:tabular-nums}.selected-task-row{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:16px 0;border-top:1px solid var(--border)}.selected-task-row:first-of-type{margin-top:20px}.selected-task-row form{margin:0}.selected-task-row button{min-height:44px;padding:8px 16px}.empty-selection{margin:20px 0 0;color:var(--muted)}.preparation-form>.card{margin-bottom:20px}.preparation-random{padding:0}.preparation-random>summary{display:flex;flex-direction:column;gap:2px;position:relative;list-style:none;padding:24px 64px 24px 28px}.preparation-random>summary::-webkit-details-marker{display:none}.preparation-random>summary::after{content:'+';position:absolute;right:28px;top:50%;translate:0 -50%;font-size:30px;font-weight:400;line-height:1}.preparation-random[open]>summary::after{content:'−'}.preparation-random>summary span{font-size:20px}.preparation-random>summary small{font-weight:400;color:var(--muted)}.preparation-random .count-grid{padding:0 28px 28px}.preparation-submit{min-width:220px}.preparation-form select,.preparation-form input{background:var(--surface)}@media(max-width:650px){.preparation-heading{align-items:stretch;flex-direction:column}.preparation-heading>.button{width:100%}.selected-task-row{align-items:flex-start}.preparation-random>summary{padding:20px 54px 20px 20px}.preparation-random .count-grid{padding:0 20px 20px}}

.bank-task{max-width:1080px;padding:28px}.bank-task .condition{font-size:16px;line-height:1.62}.bank-task .condition img{max-width:min(92%,900px);max-height:640px;object-fit:contain;margin:16px auto}.bank-task .condition table{width:auto;font-size:14px;line-height:1.2;margin:16px 0}.bank-task .condition td,.bank-task .condition th{height:32px;min-width:32px;padding:3px 6px;text-align:center;vertical-align:middle}.bank-task .condition td p,.bank-task .condition th p{margin:0;line-height:1.2}.bank-task .condition table:not(:has(img)) td[rowspan]{position:relative}.bank-task .condition table:not(:has(img)) td[rowspan]>p{position:absolute;left:50%;top:50%;width:max-content;white-space:nowrap;overflow-wrap:normal;transform:translate(-50%,-50%) rotate(-90deg);margin:0}.bank-task .eyebrow{margin-bottom:10px}@media(max-width:650px){.bank-task{padding:20px}.bank-task .condition{font-size:16px;line-height:1.58}.bank-task .condition img{max-width:100%}.bank-task .condition td,.bank-task .condition th{height:29px;min-width:29px;padding:2px 5px;font-size:13px}}

.bank-filters{display:grid;grid-template-columns:minmax(260px,2fr) repeat(3,minmax(150px,1fr));gap:16px;align-items:end;padding:22px;margin:20px 0 12px;border:1px solid var(--border);border-radius:24px;background:var(--surface)}.bank-filters label{margin:0 0 7px;font-size:14px}.bank-filters input,.bank-filters select{margin:0;border-radius:18px;background:var(--bg)}.bank-filter-actions{display:flex;gap:10px;grid-column:1/-1}.bank-result-count{margin:0 0 18px;color:var(--muted)}.bank-subtopic-label{display:inline-flex;margin:-6px 0 18px;padding:6px 12px;border-radius:999px;background:#e6e9dd;color:var(--accent);font-size:14px;font-weight:650}@media(max-width:1150px){.bank-filters{grid-template-columns:repeat(2,minmax(0,1fr))}.bank-filter-search{grid-column:1/-1}}@media(max-width:650px){.bank-filters{grid-template-columns:1fr;padding:18px}.bank-filter-search,.bank-filter-actions{grid-column:auto}.bank-filter-actions>*{flex:1}}
.rounded-select{position:relative;display:block;width:100%;min-width:0;font-weight:400}.rounded-select select[hidden]{display:none!important}.rounded-select-trigger{-webkit-appearance:none;appearance:none;display:flex;align-items:center;justify-content:space-between;gap:16px;width:100%;min-height:48px;padding:12px 16px;border:1px solid var(--border);border-radius:20px;background:var(--bg);color:var(--text);font:inherit;text-align:left}.rounded-select-trigger::after{content:'';width:8px;height:8px;flex:none;margin:0 3px 5px 0;border-right:1.5px solid currentColor;border-bottom:1.5px solid currentColor;transform:rotate(45deg)}.rounded-select-menu{position:absolute;z-index:100;top:calc(100% + 7px);left:0;display:grid;gap:4px;width:max-content;min-width:max(100%,260px);max-width:min(360px,calc(100vw - 32px));max-height:300px;padding:7px;overflow-y:auto;border:1px solid var(--border);border-radius:22px;background:var(--surface);box-shadow:0 14px 34px #1f28182b}.rounded-select-menu[hidden]{display:none}.rounded-select-option{-webkit-appearance:none;appearance:none;display:block;width:100%;min-height:44px;padding:10px 13px;border:0;border-radius:15px;background:transparent;color:var(--text);font:inherit;text-align:left}.rounded-select-option[aria-selected="true"]{background:#dfe4d3;color:var(--accent);font-weight:650}.rounded-select-option:hover,.rounded-select-option:focus-visible{background:#e6e9dd;outline:2px solid var(--accent);outline-offset:-2px}.rounded-select-trigger:disabled,.rounded-select-option:disabled{opacity:.55;cursor:default}
.lesson-board-action{max-width:720px}.lesson-board-action .primary{margin-top:4px}.lesson-board-action .hint{margin:18px 0 0}
.lesson-delete{margin-top:18px}.lesson-delete summary{color:#7c342e}.lesson-delete form{margin-top:12px}.danger-button{color:#7c342e;border-color:#bda49e}
.auth-links{display:flex;flex-wrap:wrap;justify-content:space-between;gap:10px 18px;margin:20px 0 0}.auth-message p{margin:0 0 18px}.email-address{padding:12px 16px;border-radius:16px;background:var(--bg);font-weight:650}.auth-message-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:24px}.auth-message-actions .button{flex:1}.auth input{font-size:16px}