:root{--ink:#14263e;--muted:#64748b;--line:#dce6ed;--bg:#f7fafc;--paper:#fff;--blue:#1769d1;--blue2:#0c4f9b;--mint:#19ab9a;--soft:#eaf4ff;--shadow:0 9px 30px rgba(16,51,87,.055)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;color:var(--ink);background:var(--bg);font-family:'DM Sans','Manrope',system-ui,-apple-system,Arial,sans-serif;line-height:1.55;font-size:15px}a{text-decoration:none;color:inherit}button,input,select,textarea{font:inherit}button{cursor:pointer}.site-header{display:flex;align-items:center;justify-content:space-between;padding:17px max(calc((100vw - 1220px)/2),32px);height:78px;background:#fff;border-bottom:1px solid #e9eef4;gap:28px;position:sticky;top:0;z-index:20}.brand{display:flex;align-items:center;gap:12px;white-space:nowrap;font-family:'Manrope',system-ui,sans-serif;font-size:19px;font-weight:800;letter-spacing:.5px}.brand b{color:var(--blue)}.mark{display:grid;place-items:center;flex:none;background:var(--ink);color:#fff;width:37px;height:37px;border-radius:11px;padding-bottom:8px;font-size:23px;font-weight:500;line-height:1;letter-spacing:0}.nav{display:flex;align-items:center;gap:25px;justify-content:center;flex:1}.nav a{color:#52657b;font-size:14px;font-weight:600}.nav a:hover{color:var(--blue)}.container{max-width:1220px;margin:auto;padding:42px 30px 82px;min-height:calc(100vh - 160px)}.footer{max-width:1220px;margin:auto;padding:26px 30px 38px;display:flex;justify-content:space-between;color:#8190a2;font-size:12px;border-top:1px solid #e2eaf1}.btn{display:inline-flex;align-items:center;justify-content:center;gap:11px;border-radius:10px;padding:11px 19px;font-weight:700;font-size:13px;border:1px solid transparent;white-space:nowrap;line-height:1.4;background:none}.btn:hover{transform:translateY(-1px)}.btn-primary{background:var(--blue);color:white;box-shadow:0 6px 15px rgba(23,105,209,.2)}.btn-primary:hover{background:var(--blue2)}.btn-outline{border:1px solid #bed2e3;color:#244768;background:#fff}.btn-outline:hover{border-color:var(--blue)}.btn-ghost{color:#6c7b8e}.btn-small{padding:7px 12px;font-size:12px}.full{width:100%}.actions{display:flex;gap:12px;align-items:center;flex-wrap:wrap}.overline{font-size:11px;font-weight:800;letter-spacing:1.55px;color:#2586ae;margin-bottom:11px}.eyebrow{font-size:11px;font-weight:700;letter-spacing:1.4px;color:var(--blue);display:flex;align-items:center;gap:8px}.eyebrow.plain{letter-spacing:.6px;text-transform:uppercase}.dot{width:7px;height:7px;border-radius:50%;background:#1ea8a2}.muted{color:var(--muted)}.tiny{font-size:12px}.hero{position:relative;overflow:hidden;min-height:370px;border-radius:22px;padding:65px 64px;background:radial-gradient(circle at 78% 24%,#245d9e 0,#123861 29%,#102945 60%,#0d223c 100%);color:white}.hero .eyebrow{color:#96d7eb}.hero h1{font-family:'Manrope',system-ui,sans-serif;font-size:clamp(34px,4.3vw,59px);line-height:1.13;letter-spacing:-2px;margin:17px 0 15px;position:relative;z-index:1}.hero h1 em{color:#76dcd4;font-style:normal}.hero p{font-size:15px;color:#c9d9e8;max-width:590px;line-height:1.75;margin:0 0 23px;position:relative;z-index:1}.hero .btn-primary{background:#61d9ce;color:#062944;box-shadow:none}.hero .btn-outline{background:#ffffff11;border-color:#ffffff5e;color:white}.hero .actions{position:relative;z-index:1}.hero-orbit{position:absolute;top:9%;right:3%;width:350px;height:350px;opacity:.73;pointer-events:none}.orbital{position:absolute;left:50%;top:50%;border:1.5px solid #6cdad3;border-radius:50%;transform:translate(-50%,-50%) rotate(-24deg)}.orbital.one{width:330px;height:148px}.orbital.two{width:148px;height:330px;transform:translate(-50%,-50%) rotate(-24deg)}.orbital.three{width:330px;height:148px;transform:translate(-50%,-50%) rotate(42deg)}.nucleus{position:absolute;left:50%;top:50%;background:#9beddf;box-shadow:0 0 40px #36bdb999;transform:translate(-50%,-50%);width:27px;height:27px;border-radius:50%}.section{margin-top:54px}.section-head{display:flex;align-items:end;justify-content:space-between;gap:20px;margin-bottom:19px}.section-head h2,.panel h2{margin:0;font-family:'Manrope',sans-serif;font-size:24px;letter-spacing:-.7px}.text-link{color:var(--blue);font-weight:750;font-size:13px}.subject-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:19px}.subject-card{background:linear-gradient(125deg,#e6f3fe,#f5fbff);border:1px solid #d9e9f5;border-radius:17px;padding:30px 33px;position:relative;overflow:hidden;min-height:200px;box-shadow:var(--shadow)}.subject-card.math{background:linear-gradient(125deg,#e7f7f2,#f7fcfa);border-color:#d3ebe5}.subject-num{color:#678ca4;font-size:10px;font-weight:800;letter-spacing:1.15px}.subject-card h3{font-size:28px;letter-spacing:-1px;margin:14px 0 3px}.subject-card p{color:#6b8193;margin:0}.subject-art{font-family:Georgia,serif;position:absolute;right:20px;top:-55px;font-size:210px;color:#bad5ed;opacity:.55;line-height:1}.math .subject-art{color:#a8dfcf}.card-arrow{position:absolute;right:25px;bottom:25px;font-size:22px;color:var(--blue)}.card-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.material-card{border:1px solid var(--line);background:#fff;border-radius:15px;overflow:hidden;box-shadow:var(--shadow);transition:transform .2s}.material-card:hover{transform:translateY(-4px)}.material-visual{height:165px;background:radial-gradient(circle at 30% 30%,#388bba,#163d69);color:#8ad4ee;position:relative;display:flex;align-items:center;justify-content:center}.material-card:nth-child(even) .material-visual{background:radial-gradient(circle at 30% 30%,#4bbaad,#1c5562)}.big-atom{font-family:Georgia,serif;font-size:120px;opacity:.56}.corner-label{position:absolute;top:14px;right:14px;background:#ffffff30;color:#fff;border:1px solid #ffffff45;padding:3px 10px;border-radius:20px;font-size:11px}.material-body{padding:20px}.material-body h3{font-size:17px;margin:8px 0}.material-body p{color:var(--muted);font-size:13px;min-height:36px}.empty{background:#fff;border:1px dashed #cbd9e7;padding:38px;color:#7b8b9b;text-align:center;border-radius:14px;grid-column:1/-1}.empty h3{margin:4px;color:var(--ink)}.empty-icon{font-size:45px;color:#7ba4c6}.page-heading{margin:2px 0 30px}.page-heading h1,.auth-card h1{font-family:'Manrope',sans-serif;font-size:clamp(28px,3.2vw,38px);letter-spacing:-1.2px;line-height:1.3;margin:0 0 7px}.page-heading p,.auth-card p{color:var(--muted);margin:0;max-width:740px}.page-heading.with-action{display:flex;justify-content:space-between;align-items:center;gap:20px}input,select,textarea{width:100%;border:1px solid #cedae5;border-radius:9px;padding:10px 12px;background:#fff;color:#1f344e;outline:none;font-size:14px}input:focus,select:focus,textarea:focus{border-color:#67a5e5;box-shadow:0 0 0 3px #d7e9fc}input[type=file]{padding:10px;background:#f6f9fc}input[type=checkbox]{width:auto;accent-color:var(--blue)}label{display:flex;flex-direction:column;gap:6px;color:#304a63;font-size:13px;font-weight:700}.auth-wrapper{display:flex;justify-content:center;padding:70px 10px}.auth-card{width:min(100%,460px);background:#fff;padding:43px;border:1px solid var(--line);border-radius:17px;box-shadow:var(--shadow)}.auth-card form{margin-top:30px;display:grid;gap:18px}.alert{padding:13px 17px;margin:0 0 20px;border-radius:9px;background:#e8f7ee;border:1px solid #c6ebd6;color:#11663e;font-size:13px}.alert.error{background:#fff0ef;color:#a84038;border-color:#f2cbc5}.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin:0 0 27px}.stat{background:#fff;border:1px solid var(--line);border-radius:13px;padding:20px 23px;display:flex;flex-direction:column;box-shadow:var(--shadow)}.stat strong{font-family:'Manrope',sans-serif;font-size:30px;line-height:1.2;color:var(--blue)}.stat span{font-size:12px;color:#72859a;margin-top:6px;font-weight:600}.layout-main{display:grid;grid-template-columns:minmax(0,1.9fr) minmax(280px,1fr);gap:23px;align-items:start}.side-panel,.panel{background:#fff;border:1px solid var(--line);border-radius:14px;padding:25px;box-shadow:var(--shadow)}.side-panel h3{margin:4px 0 17px;font-size:18px}.side-panel .overline{margin-bottom:2px}.lesson-list{border:1px solid var(--line);border-radius:14px;overflow:hidden;background:#fff}.lesson{display:flex;gap:20px;padding:22px;border-bottom:1px solid #e8eef2}.lesson:last-child{border-bottom:none}.lesson-time{width:54px;flex:none;font-weight:800;color:var(--blue);font-size:15px}.lesson-time small{display:block;font-size:10px;font-weight:500;color:#8794a2}.lesson-content{flex:1}.lesson-meta{color:var(--blue);font-size:11px;font-weight:800;text-transform:uppercase;letter-spacing:.3px}.lesson-meta>span:not(.tag){color:#9cafba;margin:0 5px}.lesson-content h3{margin:7px 0 5px;font-size:16px}.lesson-content p{margin:0 0 7px;font-size:12px;color:#8190a3}.mini-btn{display:inline-block;background:#e8f5ef;color:#167e60;border-radius:8px;padding:5px 9px;font-size:12px;font-weight:700;margin-top:3px}.tag{border-radius:16px;padding:3px 8px;font-size:10px;font-weight:700;color:#5c6980;background:#e8edf3;white-space:nowrap}.tag.warning{color:#99510c;background:#fff1dc}.tag.green{color:#167d58;background:#dcf5ea}.action-link{display:flex;justify-content:space-between;gap:10px;border-bottom:1px solid #e8edf3;padding:15px 1px;font-size:13px;font-weight:700;color:#25415a}.action-link:last-of-type{border:none}.action-link span{color:var(--blue)}.aside-note{margin-top:20px;border-radius:10px;padding:19px;background:#ebf5fc;color:#315674;font-size:13px}.aside-note p{margin:7px 0 0;color:#557189}.two-panel{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px}.panel h2{font-size:22px;margin-bottom:12px}.panel>p{color:#6e8195;font-size:13px}.stack{display:grid;gap:15px;margin-top:20px}.two-fields{display:grid;grid-template-columns:1fr 1fr;gap:14px}.checkline{display:flex;flex-direction:row;align-items:center;gap:9px}.hint{color:#7a8a9b;font-size:12px;line-height:1.6;margin-top:16px}.num-mark{font-size:11px;font-weight:900;color:#2e8bbb;letter-spacing:1px}.source-row{display:flex;flex-direction:column;gap:4px;border-bottom:1px solid #e8eef4;padding:14px 0;font-size:13px}.source-row small{color:var(--muted)}.source-row form{margin-top:6px}.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:12px;background:white}table{border-collapse:collapse;width:100%;font-size:13px}th,td{padding:13px 12px;text-align:left;border-bottom:1px solid #e9eef3;vertical-align:top}th{color:#61758b;font-size:11px;letter-spacing:.3px;background:#f0f6fa;text-transform:uppercase}td a{color:var(--blue)}tr:last-child td{border-bottom:none}.nowrap{white-space:nowrap}.task-card{padding:18px 19px;margin-bottom:10px;background:#fff;border:1px solid var(--line);border-radius:11px}.task-line{display:flex;justify-content:space-between;gap:15px;align-items:center}.task-card p{white-space:pre-line;font-size:13px;line-height:1.75;color:#374c62}.quick-form{display:flex;align-items:center;gap:8px}.quick-form select{max-width:200px}.class-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:13px}.class-card{display:flex;align-items:center;gap:15px;background:#fff;border:1px solid var(--line);padding:20px;border-radius:12px;box-shadow:var(--shadow)}.class-card>div{flex:1;display:flex;flex-direction:column}.class-card small{font-size:11px;color:#7b8fa1}.class-card>span:last-child{color:var(--blue)}.class-icon{background:#e5f2fc;color:#2569a8;font-weight:800;width:42px;height:42px;display:grid;place-items:center;border-radius:10px}.history-row{display:flex;align-items:start;gap:15px;padding:12px 0;border-bottom:1px solid #eaf0f4}.history-row>div{display:flex;flex-direction:column}.history-row b{font-size:13px}.history-row small{font-size:12px;color:#778a9d}.history-date{color:#497da9;font-size:11px;white-space:nowrap;padding-top:2px}.work-variant{margin:22px 0}.work-variant .task-card{background:#fafcfe}.play-heading{display:flex;justify-content:space-between;align-items:center;gap:20px;margin:0 0 20px}.play-heading h1{font-size:27px;margin:2px 0}.play-heading p{color:var(--muted);margin:0}.player{background:#06172c;border-radius:13px;overflow:hidden;border:1px solid #dce6ef;box-shadow:0 14px 40px #0b31551c}.player iframe{display:block;width:100%;height:min(73vh,760px);min-height:450px;border:none;background:white}.player iframe:fullscreen{width:100vw;height:100vh}.footer{font-size:12px}
@media(max-width:1060px){.hero-orbit{opacity:.25;right:-80px}.nav{gap:14px}.nav a{font-size:12px}.container{padding:30px 22px}.site-header{padding:13px 22px}.card-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:800px){.layout-main,.two-panel{grid-template-columns:1fr}.stats{grid-template-columns:repeat(2,1fr)}.site-header{height:auto;min-height:66px;flex-wrap:wrap}.nav{width:100%;order:3;flex-basis:100%;overflow-x:auto;justify-content:start;padding:8px 0 3px}.hero{padding:42px 25px}.hero h1{letter-spacing:-1px}.card-grid,.subject-grid,.class-grid{grid-template-columns:1fr}.subject-card{min-height:160px}.page-heading.with-action{align-items:start;flex-direction:column}.player iframe{min-height:300px}.play-heading{align-items:start;flex-direction:column}}
@media(max-width:500px){.container{padding:22px 14px 50px}.site-header{padding:12px 14px}.hero{padding:34px 20px;min-height:380px}.hero-orbit{display:none}.hero h1{font-size:32px}.two-fields,.stats{grid-template-columns:1fr 1fr}.lesson{padding:16px;gap:10px}.quick-form{flex-wrap:wrap}.quick-form select{width:100%;max-width:none}.panel{padding:18px}.page-heading h1{font-size:27px}.footer{padding:20px 14px;flex-direction:column;gap:8px}.actions .btn{white-space:normal}}

/* v0.1.5: deliberate, two-step bank reset */
.btn-danger{background:#b52d34;color:#fff;border:1px solid #a9212b;cursor:pointer;text-align:center}.btn-danger:hover{background:#94252c;color:#fff}.btn-danger:disabled{opacity:.5;cursor:not-allowed}.bank-danger-zone{margin:0 0 23px;border:1px solid #f1c9cd;border-radius:12px;padding:13px 16px;background:#fffafb}.bank-danger-zone>summary{display:inline-block;list-style:none}.bank-danger-zone>summary::-webkit-details-marker{display:none}.bank-danger-content{max-width:750px;margin-top:15px;color:#734047}.bank-danger-content p{font-size:13px;line-height:1.65}.bank-danger-content form{max-width:350px}.bank-danger-content code{word-break:break-word}
/* SHEGOR LAB 0.2 – lesson-to-interactive workflow */
.three-fields{display:grid;grid-template-columns:1.1fr 1.5fr .6fr;gap:14px}
.subsection-heading{padding-top:18px;border-top:1px solid var(--line)}
.subsection-heading h2{margin:0 0 5px}
.prompt-area{width:100%;resize:vertical;min-height:250px;font-size:13px;line-height:1.65;background:#f7fbff;color:#263c52}
.small-actions{margin-top:8px;display:flex;gap:8px;flex-wrap:wrap}
@media(max-width:800px){.three-fields{grid-template-columns:1fr}}

.material-cover{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;object-position:70% 46%}
.material-visual .corner-label{z-index:1;background:rgba(6,21,44,.68);color:#fff}

/* Five-day teacher schedule */
.week-nav{margin:0 0 22px}




.schedule-day-heading time{font-variant-numeric:tabular-nums;font-weight:700;color:#325c85}
.schedule-today{border-radius:8px;background:#dbeaff}
.schedule-lesson{position:relative;border:1px solid #d5e0ec;background:white;border-radius:12px;padding:11px;margin-bottom:8px;overflow-wrap:anywhere}
.schedule-lesson:last-child{margin-bottom:0}
.schedule-ready{border:2px solid #2e9466;background:#f6fffa}
.schedule-missing{border:2px solid #c96161;background:#fffafa}
.schedule-status{position:absolute;right:9px;top:9px;width:25px;height:25px;display:grid;place-items:center;border-radius:50%;font-weight:800}
.schedule-ready .schedule-status,.lesson-linked{background:#e0f7eb;color:#136640}
.schedule-missing .schedule-status{background:#fae3e3;color:#a02c2c}
.schedule-meta{padding-right:26px;font-size:13px;color:#425d76;font-variant-numeric:tabular-nums}
.schedule-subject{margin-top:6px;font-size:13px;color:#233f5b}
.schedule-lesson h3{font-size:15px;line-height:1.35;margin:6px 0 12px}
.schedule-lesson h3 a{color:#12304d}
.schedule-action{display:flex;align-items:center;justify-content:center;min-height:40px;padding:7px;border:1px solid #b6cee5;border-radius:8px;background:#eaf3ff;color:#124c87;font-weight:700;font-size:13px;text-align:center;line-height:1.3}
.schedule-action:hover{background:#dcecff}
.schedule-ready .schedule-action{background:#e0f7eb;border-color:#a6d6be;color:#136640}
.schedule-empty{padding:10px;color:#4b6074;font-size:14px}
.lesson-linked{padding:8px 12px;border-radius:8px;font-weight:700}


.schedule-scroll{overflow-x:auto;border:1px solid #d4e1ec;border-radius:14px;background:#f4f8fc}
.schedule-scroll .schedule-grid{width:100%;min-width:990px;table-layout:fixed;border-collapse:separate;border-spacing:0}
.schedule-grid thead th{background:#edf4fa;color:#173852;text-align:left}
.schedule-grid th,.schedule-grid td{vertical-align:top;padding:9px;border-right:1px solid #d8e4ee;border-bottom:1px solid #d8e4ee}
.schedule-grid th:last-child,.schedule-grid td:last-child{border-right:0}
.schedule-grid tr:last-child td,.schedule-grid tbody tr:last-child th{border-bottom:0}
.schedule-grid th:first-child{width:92px;font-variant-numeric:tabular-nums}
.schedule-grid tbody th{background:#edf4fa;color:#234869;text-align:left}
.schedule-grid .schedule-today{background:#dbeaff}
.schedule-day-heading time{display:block;margin-top:3px}
.schedule-gap{display:block;text-align:center;color:#657c92;padding:9px}

.material-list-actions{gap:8px;margin-top:8px}
.material-list-actions form{margin:0}
.version-history{margin-top:20px;scroll-margin-top:20px}
.version-history summary{cursor:pointer;font-weight:700}

.version-actions{gap:8px}
.version-actions .version-delete{color:#a42b35;border-color:#dfb2b6}
.version-actions .version-delete:hover{background:#fff2f3;border-color:#b6525b}

.filters{display:grid;grid-template-columns:minmax(0,2fr) minmax(130px,.65fr) minmax(0,1.1fr) auto;align-items:end;gap:12px;margin-bottom:22px}
.filters label{display:grid;gap:6px;min-width:0;font-size:13px;font-weight:700;color:var(--muted)}
.filters input,.filters select,.filters .btn{min-height:44px}
.filters input,.filters select{min-width:0}
.filter-actions{gap:8px}
.filter-error{grid-column:1/-1;margin:0;color:#a42b35;font-size:14px}
@media(max-width:850px){
  .filters{grid-template-columns:minmax(130px,.65fr) minmax(0,1fr) auto}
  .filter-search{grid-column:1/-1}
}
@media(max-width:520px){
  .filters{grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:10px}
  .filter-actions{grid-column:1/-1}
}