:root{font-size:14px;--accent: #6b4ce6;--accent-600: #5432c8;--bg-a: #f8f9ff;--bg-b: #eae6ff;--panel-bg: #ffffff;--text: #222222;--muted: #666666;--code-bg: #1e1e2f;--code-foreground: #dcdcdc;--radius-lg: 14px;--radius-md: 8px;--shadow-1: 0 6px 20px rgba(0,0,0,.12);--shadow-2: 0 14px 30px rgba(0,0,0,.08);--max-width: 1000px}body[data-theme=dark]{--bg-a: #2f3134;--bg-b: #37383c;--panel-bg: #2b2b2e;--text: #e6e6ea;--muted: #c6c6d0;--code-bg: #222327;--code-foreground: #e6e6e9}body{font-size:14px}body[data-font-size=small]{font-size:12px}body[data-font-size=medium]{font-size:14px}body[data-font-size=large]{font-size:16px}*{box-sizing:border-box}html,body,#root{height:100%}body{margin:0;font-family:Segoe UI,Roboto,system-ui,-apple-system,Helvetica Neue,Arial;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;line-height:1.45;background:linear-gradient(135deg,var(--bg-a),var(--bg-b));color:var(--text)}.sr-only{position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}a,button{font-family:inherit;font-size:inherit}.page{display:flex;flex-direction:column;min-height:100vh}.site-header{display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:12px;padding:18px 20px;background:linear-gradient(90deg,var(--accent),var(--accent-600));color:#fff;border-bottom-left-radius:18px;border-bottom-right-radius:18px;box-shadow:var(--shadow-1);position:relative}.site-header-left{display:flex;align-items:center;gap:10px;padding-left:6px}.site-logo{display:block;width:auto;height:48px}.site-logo--small{height:32px}.site-header-center{text-align:center}.site-header-center h1{margin:0;font-size:1.25rem;line-height:1;font-weight:700}.site-header-center .site-sub{margin:4px 0 0;font-size:.9rem;opacity:.95}.site-header-right{display:flex;justify-content:flex-end;align-items:center;padding-right:6px}.settings-icon,.settings-link{display:inline-flex;align-items:center;justify-content:center;width:40px;height:40px;border-radius:8px;background:transparent;border:1px solid rgba(255,255,255,.12);color:#fff;text-decoration:none;cursor:pointer;font-size:18px}.settings-icon:hover,.settings-link:hover,.settings-icon:focus,.settings-link:focus{background:#ffffff14;outline:none;box-shadow:0 2px 6px #0000001f}.settings-icon:focus-visible,.settings-link:focus-visible{outline:3px solid rgba(255,255,255,.14);outline-offset:2px}.main-grid{display:flex;flex-wrap:wrap;justify-content:center;gap:24px;padding:36px 20px;max-width:var(--max-width);margin:0 auto;flex:1}.card{background:var(--panel-bg);border-radius:var(--radius-lg);padding:22px;min-width:280px;flex:1 1 300px;box-shadow:0 8px 22px #0000000f;transition:transform .18s,box-shadow .18s;color:inherit}.card:hover{transform:translateY(-6px);box-shadow:var(--shadow-2)}.topic-list{list-style:none;padding:0;margin:8px 0 0}.topic-list li{margin:10px 0}.topic-link{display:inline-block;padding:10px 14px;border-radius:12px;text-decoration:none;color:var(--text);font-weight:700;transition:background .15s,color .15s}.topic-link:hover{background:var(--accent);color:#fff}.main-centered{display:flex;align-items:start;justify-content:center;padding:60px 20px;flex:1}.center-card{width:100%;max-width:760px;background:var(--panel-bg);border-radius:16px;padding:28px;box-shadow:0 16px 40px #140a3c0f;text-align:center}.welcome-image{display:block;max-width:220px;width:100%;margin:12px auto;border-radius:12px}.welcome-actions{display:flex;flex-direction:column;gap:.6rem;margin-top:.6rem}.topic-link.credits-link,.topic-link.quiz-link{background:transparent;color:var(--text);border:1px solid rgba(0,0,0,.06);font-weight:700}.topic-link.credits-link:hover,.topic-link.quiz-link:hover{background:var(--accent);color:#fff;border-color:var(--accent)}.credits-header{text-align:center}.site-footer{text-align:center;padding:18px 12px;background:#ffffffb8;border-top:1px solid rgba(0,0,0,.06);color:var(--muted)}body[data-theme=dark] .site-footer{background:#ffffff0a;border-top:1px solid rgba(255,255,255,.06);color:var(--muted)}.home-floating{position:fixed;right:18px;bottom:18px;background:var(--accent);color:#fff;padding:10px 12px;border-radius:10px;text-decoration:none;font-weight:600;box-shadow:0 10px 20px #0000002e}.tpl-title{margin-top:0;color:var(--accent);font-size:1.25rem}.tpl-box{background:var(--panel-bg);border-radius:12px;padding:16px;margin:14px 0;box-shadow:0 6px 18px #0000000f;text-align:left;color:inherit}body[data-theme=dark] .tpl-box{background-color:var(--panel-bg);color:var(--text);box-shadow:0 6px 18px #0000005c}.tpl-box--centered{text-align:center}.tpl-box--media{text-align:center;padding:18px}.tpl-media{width:100%;height:auto;border-radius:8px;margin-top:8px}body[data-theme=dark] .tpl-media{filter:brightness(.95)}.tpl-img-box{max-width:320px;min-width:180px;flex:0 0 280px;border-radius:10px;overflow:hidden;background:var(--panel-bg);box-shadow:0 6px 18px #0000000f;padding:8px;text-align:center}.tpl-img-box img{width:100%;height:auto;display:block;border-radius:6px}.tpl-img-box figcaption{font-size:.85rem;color:var(--muted);margin-top:6px}.tpl-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px;margin:14px 0}@media (max-width:720px){.tpl-grid{grid-template-columns:1fr}}.table-wrapper{width:100%;max-width:100%;overflow-x:auto;-webkit-overflow-scrolling:touch;box-sizing:border-box}.styled-table{width:100%;max-width:100%;border-collapse:collapse;font-family:inherit;font-size:.95rem;margin-top:1rem;box-shadow:0 2px 6px #0000000d;min-width:0;table-layout:fixed;box-sizing:border-box}.styled-table th,.styled-table td{padding:10px 14px;border-bottom:1px solid #eaeaea;text-align:left;white-space:normal;word-break:break-word;overflow-wrap:anywhere;box-sizing:border-box}.styled-table thead{background-color:#f5f5f5;font-weight:600}.styled-table tbody tr:nth-child(2n){background-color:#fafafa}.styled-table tbody tr:hover{background-color:#f0f8ff;transition:background .2s ease}body[data-theme=dark] .styled-table{background-color:var(--panel-bg);color:var(--text)}body[data-theme=dark] .styled-table th{background-color:#3a3a4a;color:#fff}body[data-theme=dark] .styled-table tbody tr:nth-child(2n){background-color:#2f2f35}body[data-theme=dark] .styled-table tbody tr:hover{background-color:#44445a}@media (max-width: 640px){.styled-table{font-size:.85rem;min-width:0;max-width:100%}.styled-table th,.styled-table td{padding:6px 8px}font-weight: 600;margin-right: .5rem}.tpl-note{margin-top:10px;padding:8px;background:#fbfbff;border-left:3px solid var(--accent);color:#333;border-radius:6px}body[data-theme=dark] .tpl-note{background:#3a3a4a;border-left-color:var(--accent);color:#ddd}.tpl-box ol{padding-left:1.4em;margin:12px 0 0}.tpl-box ol li{margin-bottom:12px;line-height:1.6;text-align:left}.tpl-box ol li::marker{font-weight:700;color:var(--accent)}.tpl-box ul{padding-left:1.4em;margin:8px 0 12px}.tpl-box ul li{margin-bottom:6px;line-height:1.5}.code-block-wrapper{margin:1rem 0}.code-block-title{font-weight:700;color:var(--accent);margin-bottom:.45rem;text-align:left}.code-block{background-color:var(--code-bg);color:var(--code-foreground);padding:1rem;border-radius:8px;overflow-x:auto;white-space:pre;font-family:Fira Code,ui-monospace,SFMono-Regular,Menlo,Monaco,Roboto Mono,Courier New,monospace;font-size:.92rem;line-height:1.45;text-align:left;border:1px solid rgba(255,255,255,.03)}.quiz-container{max-width:900px;margin:20px auto;padding:25px;background:var(--panel-bg);border-radius:10px;box-shadow:0 4px 8px #00000014}.quiz-title{font-size:28px;font-weight:700;text-align:center;margin-bottom:18px;color:var(--accent)}.question-section{margin-bottom:18px}.question-number{font-size:18px;font-weight:700;color:var(--text);margin-bottom:8px}.question-text{font-size:16px;margin-bottom:14px;color:#444}.options-section{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;margin-bottom:12px}.option-button{padding:12px;background:#f6f7fb;border:2px solid #e8e9f1;border-radius:6px;font-size:15px;color:#222;cursor:pointer;text-align:left}.option-button:hover:not(:disabled){background:#eef2ff}.option-button:disabled{opacity:.6;cursor:not-allowed}.option-button.correct{background:#d8f6d8;border-color:#6c6}.option-button.incorrect{background:#ffdede;border-color:#f66}.feedback-section{margin-top:14px;padding:12px;background:#eaf6ff;border-radius:6px;border-left:6px solid var(--accent)}.feedback-text{font-weight:700;color:#0b61b8;margin-bottom:6px}.explanation-text{font-style:italic;color:#444}.quiz-button{display:block;width:200px;padding:10px;background:var(--accent);color:#fff;border-radius:8px;margin:14px auto 0;border:none;cursor:pointer}[data-theme=dark] .quiz-container{background:#1f1f1f;box-shadow:0 4px 8px #0000004d}[data-theme=dark] .quiz-title{color:#6cf}[data-theme=dark] .question-number{color:#eee}[data-theme=dark] .question-text{color:#ddd}[data-theme=dark] .option-button{background:#2a2a2a;border:2px solid #444;color:#eee}[data-theme=dark] .option-button:hover:not(:disabled){background:#3a3a3a}[data-theme=dark] .option-button:disabled{opacity:.6;cursor:not-allowed}[data-theme=dark] .option-button.correct{background:#256d25;border-color:#6c6;color:#fff}[data-theme=dark] .option-button.incorrect{background:#662525;border-color:#f66;color:#fff}[data-theme=dark] .feedback-section{background:#0b2f4b;border-left:6px solid #66ccff;color:#ddd}[data-theme=dark] .feedback-text{color:#6cf}[data-theme=dark] .explanation-text{color:#ccc}[data-theme=dark] .quiz-button{background:#6cf;color:#1f1f1f}.modal-overlay{position:fixed;inset:0;background-color:#00000073;display:flex;align-items:center;justify-content:center;z-index:1200}.modal-content{background:var(--panel-bg);color:var(--text);padding:18px;border-radius:12px;width:360px;max-width:calc(100% - 32px);max-height:85vh;overflow-y:auto;box-shadow:0 20px 60px #00000047}.preferences-title{font-size:18px;font-weight:700;text-align:center;color:var(--accent);margin-bottom:12px}.preference-section{margin-bottom:12px}.preference-section label{display:block;font-weight:700;margin-bottom:8px;color:var(--text)}.mode-button,.font-size-button,.close-button{border-radius:6px;padding:8px 10px;cursor:pointer;border:none}.mode-button{background:var(--accent);color:#fff}.mode-button:hover{background:var(--accent-600)}.font-size-options{display:flex;gap:8px}.font-size-button{background:#f0f0f0;border:1px solid #ddd;padding:6px 10px}.font-size-button.active{background:var(--accent);color:#fff;border-color:var(--accent-600)}.close-button{background:#d56;color:#fff;width:100%;margin-top:8px}body[data-theme=dark] .modal-content{background:#16161b;color:#fff}body[data-theme=dark] .font-size-button{background:#2a2a2f;border-color:#444;color:#fff}body[data-theme=dark] .mode-button:hover{background:#432ea3}button:focus,a:focus{outline:3px solid rgba(0,0,0,.08);outline-offset:2px}.settings-icon:focus-visible,.settings-link:focus-visible{outline:3px solid rgba(255,255,255,.14)}@media (max-width: 900px){.site-header{grid-template-columns:auto 1fr auto;padding:14px}.site-logo{height:40px}.site-header-center h1{font-size:1.05rem}.welcome-image{max-width:180px}.main-grid{padding:26px 14px;gap:18px}}@media (max-width: 640px){.site-header{grid-template-columns:auto 1fr;grid-template-rows:auto auto;gap:8px;text-align:left;padding:12px}.site-header-right{grid-column:1 / -1;justify-content:flex-start}.site-header-center{grid-column:1 / -1;text-align:left;padding-left:6px}.site-logo{height:32px}.topic-link{font-size:.95rem;padding:8px 10px}.options-section{grid-template-columns:1fr}.modal-content{width:90%;padding:15px}}.welcome-logos{display:flex;align-items:center;justify-content:center;gap:16px;margin:.5rem -8px;flex-wrap:wrap}.welcome-logos img{max-width:140px;width:45%;height:auto;object-fit:contain}.welcome-x{font-size:2rem;font-weight:700;color:var(--text-light)}body[data-theme=dark] .welcome-x{color:var(--text-dark)}@media (max-width: 768px){.welcome-logos img{max-width:110px;width:38%}.welcome-x{font-size:1.5rem}}@media (max-width: 480px){.welcome-logos img{max-width:85px;width:32%}.welcome-x{font-size:1.2rem}}.back-btn{grid-column:1;justify-self:start;align-self:center;display:inline-flex;align-items:center;gap:8px;background:inherit;border:none;color:#fff;padding:8px 14px;border-radius:8px;font-size:.95rem;cursor:pointer;transition:background .12s ease,transform .08s ease}.back-btn:hover{background:#ffffff1f;transform:translateY(-1px)}.back-btn:active{transform:translateY(0)}.back-btn:focus{outline:none}.back-btn:focus-visible{box-shadow:0 0 0 3px #ffffff4d}body[data-theme=dark] .back-btn{color:#fff}body[data-theme=dark] .back-btn:hover{background:#ffffff2e}@media (max-width: 640px){.back-btn{padding:6px 12px;font-size:.9rem;border-radius:6px}}.filler-header{display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:20px 0;background:var(--header-bg, #f8f9fb);box-shadow:0 2px 6px #0000000d}.filler-header h1{font-size:28px;font-weight:700;color:var(--error-red, #e63946);margin-bottom:6px}.filler-header p{font-size:15px;font-style:italic;color:var(--text-muted, #555);margin:0}.filler-card{text-align:center}.filler-img{max-width:150px;margin-bottom:16px}.filler-card h2{color:var(--error-red, #d62828);font-size:22px;margin-bottom:10px}.filler-note{margin-top:12px;padding:15px;background:var(--msg-bg, #fff4e6);border:1px solid var(--msg-border, #ffa94d);border-radius:8px;font-size:15px;color:var(--msg-text, #663c00);line-height:1.5}[data-theme=dark] .filler-header{background:#1a1a1a!important}[data-theme=dark] .filler-header h1{color:#ff6b6b!important}[data-theme=dark] .filler-header p{color:#ccc!important}[data-theme=dark] .filler-card h2{color:#ff8787!important}[data-theme=dark] .filler-note{background:#2c2c2c!important;border-color:#ff9f43!important;color:#fff!important}