:root{color-scheme:light;--ink: #17201d;--muted: #5e6d66;--line: #d9e1dc;--soft: #f4f7f1;--paper: #fffdf8;--accent: #1d7f62;--accent-dark: #115742;--teal: #0f6f73;--indigo: #344e86;--gold: #c69539;--rose: #bd5d55;--clay: #a9533f;--mint: #dceee6;--lavender: #e6e5f4;--shadow: 0 22px 50px rgba(23, 32, 29, .12);--arabic-font: "Noto Naskh Arabic", "Traditional Arabic", "Amiri", "Scheherazade New", "Times New Roman", serif}*{box-sizing:border-box}body{margin:0;min-width:320px;color:var(--ink);background:radial-gradient(circle at top left,rgba(15,111,115,.16),transparent 32%),radial-gradient(circle at bottom right,rgba(189,93,85,.14),transparent 34%),linear-gradient(180deg,#f8f5ec,#eef4ed);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}button,input,select{font:inherit}.app-shell{width:min(1440px,100%);margin:0 auto;padding:28px}.lesson-page{width:min(1280px,100%);min-height:100vh;margin:0 auto;padding:24px}.lesson-page-topbar{position:sticky;top:0;z-index:10;display:flex;align-items:center;justify-content:space-between;gap:14px;margin-bottom:22px;padding:12px;border:1px solid rgba(23,32,29,.1);border-radius:8px;background:#fffdf8eb;box-shadow:0 12px 30px #17201d1a;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.lesson-page-topbar p{margin:0;color:var(--muted);font-weight:850}.hero{min-height:280px;display:grid;grid-template-columns:minmax(0,1fr) minmax(280px,420px);align-items:end;gap:28px;padding:48px;border:1px solid rgba(23,32,29,.1);background:linear-gradient(90deg,#fffdf8eb,#fffdf8b8),url("data:image/svg+xml,%3Csvg width='900' height='360' viewBox='0 0 900 360' xmlns='http://www.w3.org/2000/svg'%3E%3Crect width='900' height='360' fill='%23fff8e8'/%3E%3Cg fill='none' stroke='%231d7f62' stroke-width='2' opacity='.26'%3E%3Cpath d='M56 78h220M74 118h180M102 158h250M512 86h250M534 126h206M486 166h302'/%3E%3Cpath d='M142 246c42-58 92-58 150 0 52-65 118-65 178 0 42-52 96-52 146 0'/%3E%3C/g%3E%3Cg fill='%23bd5d55' opacity='.18'%3E%3Ccircle cx='690' cy='248' r='54'/%3E%3Ccircle cx='214' cy='232' r='34'/%3E%3C/g%3E%3C/svg%3E");background-size:cover;box-shadow:var(--shadow)}.hero h1{margin:10px 0 14px;max-width:820px;font-size:clamp(3rem,7vw,6.8rem);line-height:.92;letter-spacing:0}.subtitle{max-width:760px;margin:0;color:#33443d;font-size:1.15rem;line-height:1.7}.eyebrow{margin:0;color:var(--accent-dark);font-size:.76rem;font-weight:800;letter-spacing:0;text-transform:uppercase}.hero-panel{display:grid;gap:14px;padding:18px;border:1px solid rgba(23,32,29,.12);background:#fffdf8db;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.hero-panel>div{display:flex;align-items:baseline;justify-content:space-between;gap:18px;padding-bottom:12px;border-bottom:1px solid var(--line)}.hero-panel>div:last-child{padding-bottom:0;border-bottom:0}.metric{font-size:1.7rem;font-weight:850}.metric-label,.muted,small{color:var(--muted)}.workspace{display:grid;grid-template-columns:360px minmax(0,1fr);gap:24px;margin-top:24px;align-items:start}.control-panel,.result-panel{border:1px solid rgba(23,32,29,.11);background:#fffdf8eb;box-shadow:var(--shadow)}.control-panel{position:sticky;top:20px;display:grid;gap:18px;padding:22px}.panel-heading h2,.result-toolbar h2,.empty-state h2,.section h3{margin:6px 0 0;letter-spacing:0}.field{display:grid;gap:8px;color:#33443d;font-weight:700}.field-row{display:flex;align-items:center;justify-content:space-between}input,select{width:100%;min-height:46px;border:1px solid var(--line);border-radius:8px;padding:0 12px;color:var(--ink);background:#fff;outline:none}input:focus,select:focus{border-color:var(--accent);box-shadow:0 0 0 3px #1d7f6229}.range-row{display:grid;grid-template-columns:1fr 1fr;gap:10px}.range-row label{display:grid;gap:6px;color:var(--muted);font-size:.86rem;font-weight:800}.range-row input{text-align:center;font-size:1.08rem;font-weight:850}.page-preview-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;max-height:440px;overflow:auto;padding-right:4px}.page-preview-card{margin:0;padding:0;border:1px solid var(--line);border-radius:8px;overflow:hidden;background:#fff;cursor:pointer;text-align:left;transition:border-color .16s ease,box-shadow .16s ease,transform .16s ease}.page-preview-card:hover,.page-preview-card:focus-visible{border-color:var(--accent);box-shadow:0 10px 24px #17201d29;transform:translateY(-1px);outline:none}.page-preview-card img{display:block;width:100%;aspect-ratio:3 / 4;object-fit:cover;object-position:top center;background:var(--soft)}.page-preview-card figcaption{padding:8px;color:var(--muted);font-size:.78rem;font-weight:850;text-align:center}.page-preview-empty{padding:16px;border:1px dashed var(--line);border-radius:8px;color:var(--muted);background:#fff9;line-height:1.45}.preview-modal-backdrop{position:fixed;inset:0;z-index:20;display:grid;place-items:center;padding:24px;background:#17201da3}.preview-modal{width:min(860px,100%);max-height:min(92vh,980px);display:grid;grid-template-rows:auto minmax(0,1fr);border:1px solid rgba(255,255,255,.35);border-radius:8px;overflow:hidden;background:var(--paper);box-shadow:0 26px 80px #00000057}.preview-modal-header{display:flex;align-items:center;justify-content:space-between;gap:18px;padding:16px;border-bottom:1px solid var(--line)}.preview-modal-header h2{margin:4px 0 0}.preview-modal img{width:100%;height:100%;min-height:0;object-fit:contain;background:#fff}.primary-button,.secondary-button,.icon-button,.tab{border:0;border-radius:8px;cursor:pointer;font-weight:800}.primary-button,.secondary-button{min-height:48px;padding:0 18px}.primary-button{color:#fff;background:var(--accent)}.secondary-button{color:#fff;background:var(--accent-dark)}.secondary-button.compact{min-height:38px;padding:0 14px}.primary-button:disabled,.secondary-button:disabled{cursor:wait;opacity:.7}.icon-button{width:34px;height:34px;color:var(--accent-dark);background:var(--soft)}.status-box{min-height:52px;padding:12px;border-left:4px solid var(--gold);background:var(--soft);color:#394940;line-height:1.45}.status-box.error{border-color:var(--rose);background:#fff0ed}.status-box.success{border-color:var(--accent)}.result-panel{min-height:720px}.tabs{display:flex;gap:6px;padding:10px;border-bottom:1px solid var(--line);background:#f4f7f1db}.tab{min-height:40px;padding:0 14px;color:var(--muted);background:transparent}.tab.active{color:var(--accent-dark);background:#fff;box-shadow:inset 0 0 0 1px var(--line)}.tab-view{display:none;padding:24px}.tab-view.active{display:block}.empty-state{min-height:560px;display:grid;place-items:center;align-content:center;gap:8px;text-align:center;color:var(--muted)}.empty-state h2{color:var(--ink)}.empty-mark{width:74px;height:74px;display:grid;place-items:center;border:1px solid var(--line);border-radius:50%;color:var(--accent-dark);background:#fff;font-size:2rem;font-weight:850}.hidden{display:none!important}.result-toolbar{display:flex;align-items:center;justify-content:space-between;gap:18px;margin-bottom:18px}.markdown-card{max-height:560px;overflow:auto;padding:24px;border:1px solid var(--line);background:#fff;line-height:1.75}.markdown-card h1,.markdown-card h2,.markdown-card h3{margin:20px 0 8px}.markdown-card pre{white-space:pre-wrap;word-break:break-word}.generated-content{display:grid;gap:18px}.history-list{display:grid;gap:16px;margin-bottom:22px}.history-header{display:flex;align-items:center;justify-content:space-between;gap:16px}.history-header h2{margin:6px 0 0}.history-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:12px}.history-card{display:grid;gap:10px;padding:18px;border:1px solid var(--line);border-radius:8px;color:var(--ink);background:linear-gradient(145deg,#dceee6b8,#ffffffdb 42%),#fff;cursor:pointer;text-align:left;transition:border-color .16s ease,box-shadow .16s ease,transform .16s ease}.history-card:hover,.history-card:focus-visible,.history-card.active{border-color:var(--accent);box-shadow:0 12px 28px #17201d1f;transform:translateY(-1px);outline:none}.history-card h3{margin:0;font-size:1rem}.history-card p{margin:0;color:var(--muted);line-height:1.45}.history-card-topline{display:flex;align-items:center;justify-content:space-between;gap:10px;color:var(--muted);font-size:.76rem;font-weight:850}.history-summary{display:-webkit-box;overflow:hidden;-webkit-box-orient:vertical;-webkit-line-clamp:3}.mini-lesson-preview{display:grid;grid-template-columns:1fr auto;gap:8px 12px;padding:12px;border:1px solid rgba(29,127,98,.16);border-radius:8px;background:#fffdf8bd;color:var(--muted);font-size:.84rem}.mini-lesson-preview strong{color:var(--teal)}.history-meta,.history-counts{display:flex;flex-wrap:wrap;gap:8px;color:var(--muted);font-size:.78rem;font-weight:800}.history-counts span{padding:5px 8px;border-radius:999px;background:var(--soft)}.history-empty{padding:18px;border:1px dashed var(--line);border-radius:8px;color:var(--muted);background:#ffffffa6}.history-detail{margin-top:18px}.lesson-viewer{display:grid;gap:18px}.lesson-hero{display:flex;align-items:end;justify-content:space-between;gap:18px;padding:30px;border:1px solid rgba(15,111,115,.16);border-radius:8px;color:#f7fff9;background:linear-gradient(135deg,#0e5844fa,#0f6f73f0 54%,#344e86e0),var(--accent-dark)}.lesson-hero .eyebrow{color:#d8f2e6}.lesson-hero h2{margin:6px 0 10px;color:#fff;font-size:clamp(1.8rem,3vw,3rem);line-height:1.12}.lesson-hero p{margin:0;color:#ffffffc7}.lesson-stats{display:flex;flex-wrap:wrap;justify-content:flex-end;gap:8px}.lesson-stats span{padding:8px 10px;border:1px solid rgba(255,255,255,.22);border-radius:999px;color:#fff;background:#ffffff1f;font-size:.82rem;font-weight:850}.lesson-tabs{display:grid;grid-template-columns:repeat(auto-fit,minmax(145px,1fr));gap:10px}.lesson-tab{min-height:62px;display:flex;align-items:center;justify-content:space-between;gap:10px;padding:0 14px;border:1px solid var(--line);border-radius:8px;color:var(--muted);background:#fffdf8f0;cursor:pointer;font-weight:850}.lesson-tab strong{min-width:26px;height:26px;display:grid;place-items:center;border-radius:999px;color:var(--teal);background:var(--mint)}.lesson-tab.active{border-color:var(--teal);color:var(--accent-dark);background:linear-gradient(135deg,#fff,var(--mint));box-shadow:0 10px 22px #0f6f731a}.lesson-panel{padding:28px;border:1px solid var(--line);border-radius:8px;background:linear-gradient(180deg,#fffdf8fa,#fffdf8e6),var(--paper);box-shadow:0 16px 38px #17201d14}.lesson-panel>h3,.lesson-section-heading h3{margin:6px 0 0}.lesson-panel>p{max-width:850px;line-height:1.7}.lesson-section-heading{margin-bottom:14px}.notes-list,.quiz-list,.exercise-list{display:grid;gap:12px}.note-card,.quiz-card,.exercise-card,.term-card{position:relative;padding:20px;border:1px solid var(--line);border-radius:8px;background:#ffffffe6;line-height:1.72}.note-card{padding-left:54px}.note-number{position:absolute;top:16px;left:16px;width:28px;height:28px;display:grid;place-items:center;border-radius:999px;color:#fff;background:var(--teal);font-weight:900}.note-card h4,.quiz-card h4,.exercise-card h4,.term-card h4{margin:0 0 8px}.example-strip{display:flex;flex-wrap:wrap;gap:10px;margin-top:12px}.example-chip{display:grid;gap:4px;min-width:180px;padding:10px;border-radius:8px;background:var(--soft)}.term-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:12px}.term-card{border-color:#344e862e;background:linear-gradient(145deg,#fff,var(--lavender))}.option-list{display:flex;flex-wrap:wrap;gap:8px;margin:10px 0}.option-list span{padding:8px 10px;border:1px solid var(--line);border-radius:8px;background:var(--soft)}.flashcard-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:18px}.flashcard{position:relative;min-height:390px;border:0;border-radius:8px;padding:0;background:transparent;cursor:pointer;perspective:1000px}.flashcard-face{position:absolute;inset:0;display:grid;align-content:start;gap:18px;padding:46px 28px 26px;border:1px solid rgba(15,111,115,.2);border-radius:8px;backface-visibility:hidden;transform-style:preserve-3d;transition:transform .26s ease;box-shadow:0 16px 32px #17201d1f;overflow:auto;scrollbar-width:thin}.flashcard-front{color:#fff;background:linear-gradient(145deg,#115742fa,#0f6f73eb 58%,#344e86d6),var(--accent-dark)}.flashcard-back{color:var(--ink);background:linear-gradient(145deg,#fffdf8,#eef7f2 58%,#f5efe5),#fff;transform:rotateY(180deg)}.flashcard.flipped .flashcard-front{transform:rotateY(180deg)}.flashcard.flipped .flashcard-back{transform:rotateY(360deg)}.flashcard-corner{position:absolute;z-index:2;top:12px;left:12px;padding:5px 8px;border-radius:999px;color:var(--accent-dark);background:#ffffffdb;font-size:.76rem;font-weight:900}.flashcard-arabic{direction:rtl;font-family:var(--arabic-font);font-size:clamp(3.1rem,6vw,5.1rem);font-weight:400;line-height:1.65;letter-spacing:0;word-spacing:.16em;text-rendering:optimizeLegibility}.flashcard-prompt{font-size:1.18rem;font-weight:850;line-height:1.65}.flashcard-answer{font-size:1.08rem;line-height:1.8}.flashcard-focus{direction:rtl;color:var(--teal);font-family:var(--arabic-font);font-size:2.7rem;font-weight:400;line-height:1.75;word-spacing:.14em}.flashcard-hint{color:inherit;opacity:.68;font-size:.8rem;font-weight:850}.summary-card,.section,.item-card{border:1px solid var(--line);background:#fff}.summary-card,.section{padding:20px}.summary-card h2{margin:0 0 10px}.section-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:12px;margin-top:14px}.item-card{padding:14px;line-height:1.55}.arabic{direction:rtl;font-family:var(--arabic-font);font-size:1.85rem;font-weight:400;line-height:2.05;letter-spacing:0;word-spacing:.12em;text-rendering:optimizeLegibility;font-feature-settings:"kern" 1,"liga" 1,"calt" 1}.arabic-inline{direction:rtl;unicode-bidi:isolate;display:inline-block;margin:0 .14em;font-family:var(--arabic-font);font-size:1.18em;font-weight:400;line-height:1.9;word-spacing:.12em;color:#063f45;text-rendering:optimizeLegibility;font-feature-settings:"kern" 1,"liga" 1,"calt" 1}.pill{display:inline-flex;align-items:center;min-height:28px;padding:0 10px;border-radius:999px;color:var(--accent-dark);background:var(--soft);font-size:.82rem;font-weight:800}@media(max-width:980px){.app-shell{padding:14px}.hero,.workspace{grid-template-columns:1fr}.hero{padding:28px}.control-panel{position:static}.result-toolbar{align-items:stretch;flex-direction:column}}@media(max-width:560px){.hero{min-height:420px}.tabs{overflow-x:auto}.tab{white-space:nowrap}}