.range-form{display:grid;grid-template-columns:1.2fr 1fr 1fr 1fr;gap:14px;margin:20px 0}.range-form label{display:grid;gap:7px;font-size:14px}.range-form input,.range-form select{border:1px solid #cbd5c7;background:#fff;border-radius:8px;padding:10px;width:100%;font:inherit;color:#183d36;min-height:46px}.range-status{padding:18px;background:#f2f4e9;border-radius:10px;margin:17px 0}.range-status p{margin:5px 0}.book-frame{width:100%;height:650px;border:1px solid #dce2d7;border-radius:10px;margin-top:18px}.book-callout{display:flex;align-items:center;justify-content:space-between;gap:18px;background:#edf1e5;padding:19px 22px;border-radius:12px;margin-top:22px}.book-callout p{font-size:13px;color:#68736e}.hero small{color:inherit}.reader-title{margin-top:28px}.covered{display:flex;gap:7px;flex-wrap:wrap;margin-top:10px}.covered span{background:white;border:1px solid #dce2d7;padding:2px 8px;border-radius:5px;font-size:13px}@media(max-width:760px){.range-form{grid-template-columns:1fr 1fr}.book-frame{height:500px}.book-callout{align-items:start;flex-direction:column}}
:root{--ink:#183d36;--muted:#68736e;--paper:#f7f8f4;--line:#e2e7df;--lime:#e6edb1;--green:#1e5846;--red:#a03932;--amber:#785515}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:#253b34;font-family:Tahoma,Arial,sans-serif;font-size:16px;line-height:1.8}button,a,input{font:inherit}a{color:inherit}button{cursor:pointer}button:disabled{cursor:not-allowed;opacity:.58}button:focus-visible,a:focus-visible,input:focus-visible{outline:3px solid #b38625;outline-offset:4px}button{border:0}h1,h2,h3,p{margin:0}h1{font-size:30px;line-height:1.5;letter-spacing:-.7px}h2{font-size:22px}h3{font-size:18px}small,.meta{font-size:14px;color:var(--muted)}.shell{display:flex;min-height:100vh}.sidebar{width:250px;flex-shrink:0;background:#fff;border-left:1px solid var(--line);padding:34px 24px;display:flex;flex-direction:column;position:fixed;inset:0 0 0 auto}.brand{display:flex;gap:12px;align-items:center;text-decoration:none;font-size:32px;font-weight:bold;line-height:1.3}.brand small{display:block;font-size:12px;font-weight:normal;margin-top:6px}.brand-icon{width:48px;height:52px;background:var(--ink);color:var(--lime);border-radius:15px 15px 3px 15px;display:grid;place-items:center;font-size:30px}.class-label{font-size:12px;color:#858d85;margin:52px 10px 15px}nav{display:grid;gap:9px}nav a{padding:11px 13px;border-radius:10px;display:flex;align-items:center;gap:10px;text-decoration:none;font-size:14px}nav a span{font-size:22px;width:23px;line-height:1}nav a.active{background:#edf1e5;color:var(--ink);font-weight:bold}nav a:hover{background:#f4f6f0}nav b{font-size:12px;background:#fff;border-radius:5px;padding:0 7px;margin-right:auto}.sidebar-bottom{margin-top:auto;padding-top:40px}.sidebar-bottom p{font-size:14px;margin:16px 0;color:var(--muted)}.sidebar-bottom small{font-size:12px}.small-badge,.pill{display:inline-block;padding:4px 10px;background:#edf1e5;border-radius:7px;font-size:12px}.workspace{margin-right:250px;width:calc(100% - 250px)}.topbar{height:82px;border-bottom:1px solid var(--line);display:flex;justify-content:space-between;align-items:center;padding:0 44px;background:#fff;font-size:14px}.crumb{color:#b7bdb7;padding:0 12px}.version{display:flex;gap:9px;align-items:center;font-size:12px;color:var(--muted)}.version i{display:block;width:7px;height:7px;background:#93a871;border-radius:50%}main{max-width:1250px;margin:auto;padding:35px 44px 55px;min-height:calc(100vh - 150px)}.eyebrow{font-size:13px;color:var(--muted);margin-bottom:5px}.heading{display:flex;justify-content:space-between;align-items:center;margin-bottom:25px;gap:16px}.heading p{color:var(--muted);margin-top:7px}.date-pill{background:#fff;border:1px solid var(--line);padding:7px 12px;border-radius:8px;white-space:nowrap;font-size:13px}.hero{background:var(--ink);color:#fff;border-radius:20px;display:grid;grid-template-columns:1.8fr 1fr;min-height:245px;overflow:hidden;padding:30px 34px;gap:25px;position:relative}.hero .eyebrow{color:#c9d8aa;letter-spacing:.3px}.hero h2{font-size:28px;line-height:1.7;margin:8px 0}.hero p{color:#d5e0d8;font-size:15px;max-width:480px;margin-bottom:21px}.hero-art{border-right:1px solid #547068;padding-right:30px;display:flex;flex-direction:column;justify-content:center;align-items:center;gap:12px}.letter-cloud{font-family:Georgia,'Times New Roman',serif;font-size:76px;line-height:1.3;color:var(--lime);transform:rotate(-7deg)}.hero-art small{color:#ccd5cd}.btn{border-radius:9px;background:var(--ink);color:#fff;padding:11px 19px;font-weight:bold;font-size:14px;display:inline-flex;justify-content:center;gap:10px;align-items:center;text-decoration:none}.btn:hover{filter:brightness(1.12)}.btn.light{background:var(--lime);color:var(--ink)}.btn.secondary{background:#fff;color:var(--ink);border:1px solid var(--line)}.btn.ghost{background:#edf1e5;color:var(--ink)}.actions{display:flex;gap:10px;align-items:center;flex-wrap:wrap}.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:15px;margin:22px 0 33px}.stat{border:1px solid var(--line);background:#fff;border-radius:12px;padding:17px 20px;display:flex;gap:14px;align-items:center}.stat-icon{width:43px;height:43px;background:#f2f4e9;border-radius:10px;display:grid;place-items:center;font-size:23px;color:var(--green)}.stat strong{font-size:24px;line-height:1.3;display:block}.stat small{font-size:12px}.section-heading{display:flex;justify-content:space-between;align-items:center;margin:25px 0 17px;gap:12px}.section-heading h2{font-size:21px}.section-heading p{font-size:13px;color:var(--muted)}.topic-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.topic{background:#fff;border:1px solid var(--line);border-radius:13px;padding:21px;transition:transform .15s,box-shadow .15s}.topic:hover{transform:translateY(-2px);box-shadow:0 8px 20px #183d3609}.topic-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:15px}.topic-icon{width:43px;height:43px;background:#f1eee6;color:#735f3b;display:grid;place-items:center;border-radius:10px;font-family:'Times New Roman',serif;font-weight:bold;font-size:23px}.topic:nth-child(2n) .topic-icon{background:#edf2e9;color:var(--green)}.topic:nth-child(3n) .topic-icon{background:#eaf0f3;color:#456377}.topic p{font-size:13px;color:var(--muted);margin:5px 0 15px;min-height:24px}.topic .actions{justify-content:space-between;border-top:1px solid #eff1eb;padding-top:14px}.text-btn{background:none;padding:4px 0;color:var(--green);font-size:14px;font-weight:bold}.topic small{font-size:12px}.notice{margin-top:24px;padding:15px 18px;border:1px solid #e4e4cb;background:#f4f4e7;border-radius:10px;font-size:13px;color:#686347}.notice a{font-weight:bold}.panel{background:#fff;border:1px solid var(--line);border-radius:16px;padding:27px;margin-bottom:20px}.panel p{margin:10px 0;color:#53635a}.empty{text-align:center;padding:55px 25px}.empty .empty-icon{font-size:52px;color:#a1af89;margin-bottom:10px}.empty p{color:var(--muted);margin:12px 0 23px}.quiz-wrap{max-width:820px;margin:auto}.quiz-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:18px}.quiz-head h1{font-size:23px}progress{width:100%;height:8px;border:0;border-radius:10px;background:#e8ece3;display:block;margin:15px 0 25px;overflow:hidden}progress::-webkit-progress-bar{background:#e8ece3}progress::-webkit-progress-value{background:#6d8b56;border-radius:10px}progress::-moz-progress-bar{background:#6d8b56}.question-tag{color:var(--green);font-size:13px;margin-bottom:16px}.question-text{font-size:25px;line-height:1.8;margin:10px 0 25px}.choice-list{display:grid;gap:12px}.choice{border:1px solid #dce2d7;border-radius:10px;padding:15px;display:flex;gap:13px;align-items:center;background:#fff;cursor:pointer;line-height:1.6}.choice:has(input:checked){border-color:var(--green);background:#edf3e9;box-shadow:0 0 0 1px var(--green)}input[type=radio]{width:18px;height:18px;accent-color:var(--green);flex-shrink:0}.confidence{border:0;padding:0;margin:25px 0}.confidence legend{font-size:14px;margin-bottom:10px}.confidence .confidence-options{display:flex;gap:10px;flex-wrap:wrap}.confidence label{border:1px solid var(--line);border-radius:7px;padding:6px 13px;font-size:14px;display:flex;align-items:center;gap:8px;cursor:pointer}.confidence label:has(input:checked){border-color:var(--green);background:#edf3e9}.feedback{border-radius:12px;padding:20px;background:#edf4e8;margin:20px 0}.feedback.wrong{background:#fbefea}.feedback h3{color:var(--green)}.feedback.wrong h3{color:var(--red)}.feedback p{margin:8px 0}.feedback small{display:block}.quiz-controls{display:flex;justify-content:space-between;align-items:center;gap:15px;border-top:1px solid var(--line);padding-top:20px}.score-panel{background:var(--ink);color:#fff;text-align:center;padding:35px;border-radius:17px;margin-bottom:24px}.score-panel p{color:#dce3d5}.score-number{font-size:68px;line-height:1.5;color:var(--lime);font-weight:bold}.result-list{display:grid;gap:13px;margin-top:20px}.result-item{padding:18px;background:#fff;border:1px solid var(--line);border-radius:12px}.result-item summary{cursor:pointer;list-style-position:inside;font-weight:bold}.result-item p{font-size:15px;margin-top:12px}.result-item .right{color:var(--green)}.result-item .wrong{color:var(--red)}.tag{font-size:12px;border-radius:4px;background:#f0f2eb;display:inline-block;padding:2px 8px;font-weight:normal;margin:0 5px}.review-card{display:grid;grid-template-columns:1fr auto;gap:16px;align-items:center}.review-card .meta{margin-top:7px}.lesson{font-size:19px;line-height:2.1}.example{padding:19px 23px;background:#f2f4e9;border-right:3px solid #7e9865;border-radius:8px;margin-top:22px}.example strong{display:block;font-size:14px;margin-bottom:8px}.step-row{display:flex;gap:10px;flex-wrap:wrap;margin:20px 0}.step-row span{background:#f1f3ea;border-radius:8px;padding:5px 13px;font-size:13px}.table-wrap{overflow:auto}table{border-collapse:collapse;width:100%;text-align:right;font-size:14px}th,td{padding:14px 12px;border-bottom:1px solid var(--line);white-space:nowrap}th{color:var(--muted);font-weight:normal}.sources-list{line-height:2.2}.sources-list a{color:#175e8c;overflow-wrap:anywhere}.danger{color:var(--red)}footer{padding:18px 44px;font-size:12px;color:var(--muted);border-top:1px solid var(--line);display:flex;justify-content:space-between;gap:10px}.skip{position:absolute;top:-100px;background:#fff;padding:10px;z-index:10}.skip:focus{top:0}#toast{position:fixed;bottom:25px;left:25px;max-width:90vw;background:var(--ink);color:#fff;border-radius:8px;padding:12px 22px;display:none;z-index:10;font-size:14px}#toast.show{display:block}#print-area{display:none}.storage-warning{padding:12px;background:#fff0dc;color:#714a17;border-radius:8px;margin-bottom:15px;font-size:14px}
main:focus{outline:none}.hero .small-badge{color:var(--ink)}.letter-cloud{white-space:nowrap;font-size:58px}
@media(min-width:1450px){main{padding-top:45px}.hero{min-height:265px}.topic{padding:25px}}
@media(max-width:1150px){.sidebar{width:210px;padding:28px 17px}.workspace{margin-right:210px;width:calc(100% - 210px)}main{padding:28px}.topbar{padding:0 28px}.topic-grid{grid-template-columns:repeat(2,1fr)}.hero h2{font-size:25px}.hero-art{padding-right:18px}.letter-cloud{font-size:60px}}
@media(max-width:760px){.shell{display:block}.sidebar{position:static;width:100%;padding:16px 20px 0;border-left:0;border-bottom:1px solid var(--line)}.brand{font-size:27px}.brand-icon{width:40px;height:43px}.brand small{font-size:11px}.class-label,.sidebar-bottom{display:none}nav{display:flex;gap:4px;margin-top:17px;overflow:auto;scrollbar-width:none}nav a{white-space:nowrap;flex:1;font-size:12px;padding:10px 8px;border-radius:8px 8px 0 0;justify-content:center}nav a span{display:none}nav b{font-size:11px;margin:0}.workspace{margin:0;width:100%}.topbar{height:58px;padding:0 20px;font-size:12px}.version{font-size:11px}main{padding:25px 20px 35px}.heading{margin-bottom:20px}.heading h1{font-size:26px}.heading p{font-size:14px}.date-pill{display:none}.hero{padding:24px;grid-template-columns:1fr;min-height:0;gap:0}.hero h2{font-size:25px}.hero-art{display:none}.hero p{font-size:14px}.stats{gap:8px;margin:16px 0 27px}.stat{padding:13px 9px;display:block;text-align:center}.stat-icon{display:none}.stat strong{font-size:24px}.stat small{font-size:11px}.section-heading{align-items:start}.section-heading h2{font-size:19px}.section-heading p{font-size:12px}.topic-grid{gap:12px}.topic{padding:16px}.topic h3{font-size:17px}.topic p{min-height:48px}.topic-top{margin-bottom:10px}.topic-icon{width:38px;height:38px;font-size:21px}.topic .actions{gap:5px}.topic .actions button{font-size:13px}.topic small{font-size:11px}.notice{font-size:12px}.panel{padding:20px}.question-text{font-size:22px}.quiz-head h1{font-size:20px}.quiz-controls{align-items:stretch;flex-direction:column}.quiz-controls .btn{width:100%}.review-card{grid-template-columns:1fr}.score-number{font-size:57px}.lesson{font-size:18px}.confidence label{padding:7px 10px}.choice{padding:13px}.heading .btn{padding:9px 12px;font-size:12px}footer{padding:18px 20px;flex-direction:column}.score-panel{padding:27px 16px}}
@media(max-width:600px){nav{display:grid;grid-template-columns:repeat(3,1fr);overflow:visible}nav a{white-space:normal;font-size:12px;padding:9px 6px;text-align:center;border-radius:8px;min-height:44px}.sidebar{padding-bottom:10px}.topic-grid{grid-template-columns:1fr}.topic p{min-height:0;font-size:14px}.topic .actions button{font-size:14px}.topic h3{font-size:19px}.topic .actions{padding-top:12px}.topic-top{margin-bottom:4px}}
@media(max-width:380px){.confidence .confidence-options{gap:5px}.confidence label{font-size:13px}.section-heading{flex-direction:column}}
@media(prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}
@media print{.shell,#toast{display:none!important}#print-area{display:block;direction:rtl;color:#000;font-size:14px}#print-area h1{font-size:24px}#print-area li{margin-bottom:20px;break-inside:avoid}#print-area .answer-sheet{break-before:page}#print-area p{margin:12px 0}@page{size:A4;margin:18mm}}