:root{--fi: #0a6ed1;--fi-dark: #085baa;--co: #107e3e;--bg: #f5f6f7;--surface: #ffffff;--border: #e3e6e8;--text: #1d2d3e;--muted: #5a6b7b;--accent: #0a6ed1;--ok: #107e3e;--bad: #bb0000;--warn: #e9730c;--shadow: 0 1px 3px rgba(0, 0, 0, .08), 0 4px 16px rgba(0, 0, 0, .04);--radius: 12px}*{box-sizing:border-box}html,body,#root{height:100%}body{margin:0;font-family:Segoe UI,system-ui,-apple-system,Roboto,Helvetica,Arial,sans-serif;background:var(--bg);color:var(--text);-webkit-font-smoothing:antialiased}.app{display:grid;grid-template-columns:248px 1fr;min-height:100vh}.sidebar{background:#fff;border-right:1px solid var(--border);padding:20px 14px;position:sticky;top:0;height:100vh;display:flex;flex-direction:column;gap:6px}.brand{display:flex;align-items:center;gap:10px;padding:4px 8px 18px}.brand .logo{width:38px;height:38px;background:linear-gradient(135deg,var(--fi),#2a8fe0);border-radius:9px;display:grid;place-items:center;color:#fff;font-weight:800;font-size:15px;flex-shrink:0}.brand h1{font-size:16px;margin:0;line-height:1.2}.brand span{font-size:11.5px;color:var(--muted)}.nav-btn{display:flex;align-items:center;gap:11px;width:100%;padding:10px 12px;border:none;background:transparent;border-radius:9px;color:var(--text);font-size:14px;text-align:left;cursor:pointer;transition:background .12s}.nav-btn:hover{background:#eef4fb}.nav-btn.active{background:#e3eefb;color:var(--fi);font-weight:600}.nav-btn .ico{font-size:17px;width:20px;text-align:center}.sidebar-footer{margin-top:auto;font-size:11px;color:var(--muted);padding:8px}.main{padding:30px 38px 60px;max-width:980px;width:100%}.page-head{margin-bottom:22px}.page-head h2{margin:0 0 4px;font-size:25px}.page-head p{margin:0;color:var(--muted);font-size:14.5px}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:20px 22px}.grid{display:grid;gap:16px}.grid.cols-2{grid-template-columns:repeat(2,1fr)}.grid.cols-3{grid-template-columns:repeat(3,1fr)}.grid.cols-4{grid-template-columns:repeat(4,1fr)}.badge{display:inline-block;font-size:11px;font-weight:700;padding:2px 8px;border-radius:20px;letter-spacing:.3px}.badge.FI{background:#e3eefb;color:var(--fi)}.badge.CO{background:#e2f3e8;color:var(--co)}.btn{font:inherit;border:1px solid var(--border);background:#fff;color:var(--text);padding:9px 16px;border-radius:8px;cursor:pointer;font-weight:600;font-size:14px;transition:all .12s}.btn:hover{border-color:#c4ccd3}.btn.primary{background:var(--fi);color:#fff;border-color:var(--fi)}.btn.primary:hover{background:#085baa}.btn.ok{background:var(--ok);color:#fff;border-color:var(--ok)}.btn.bad{background:#fff;color:var(--bad);border-color:#e6b3b3}.btn:disabled{opacity:.5;cursor:default}.btn.ghost{background:transparent;border-color:transparent;color:var(--muted)}.row{display:flex;align-items:center;gap:10px;flex-wrap:wrap}.spread{justify-content:space-between}.stat{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:18px 20px;box-shadow:var(--shadow)}.stat .num{font-size:30px;font-weight:800;line-height:1}.stat .lbl{color:var(--muted);font-size:13px;margin-top:6px}.progress-track{height:8px;background:#eaedf0;border-radius:6px;overflow:hidden}.progress-fill{height:100%;background:var(--fi);border-radius:6px;transition:width .3s}.progress-fill.co{background:var(--co)}.lesson-item{cursor:pointer;transition:border-color .12s,transform .08s}.lesson-item:hover{border-color:#c4d6ef;transform:translateY(-1px)}.lesson-item .title{font-size:16px;font-weight:600;margin:8px 0 4px}.lesson-item .meta{color:var(--muted);font-size:12.5px}.lesson-item .check{color:var(--ok);font-weight:700}.section{margin-bottom:22px}.section h3{font-size:17px;margin:0 0 8px;padding-left:11px;border-left:3px solid var(--fi)}.section .body{white-space:pre-wrap;line-height:1.62;color:#2b3b4b;font-size:14.7px}.flashcard{perspective:1400px;height:280px;cursor:pointer}.flashcard-inner{position:relative;width:100%;height:100%;transition:transform .5s;transform-style:preserve-3d}.flashcard.flipped .flashcard-inner{transform:rotateY(180deg)}.flashcard-face{position:absolute;top:0;right:0;bottom:0;left:0;backface-visibility:hidden;border-radius:16px;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:32px;text-align:center;box-shadow:var(--shadow);border:1px solid var(--border)}.flashcard-face.front{background:#fff}.flashcard-face.back{background:#f3f8fe;transform:rotateY(180deg)}.flashcard-face .hint{position:absolute;bottom:14px;font-size:12px;color:var(--muted)}.flashcard-face .term{font-size:24px;font-weight:700}.flashcard-face .def{font-size:16.5px;line-height:1.55;color:#2b3b4b}.quiz-option{display:block;width:100%;text-align:left;padding:14px 16px;margin:9px 0;border:1.5px solid var(--border);border-radius:10px;background:#fff;cursor:pointer;font:inherit;font-size:15px;transition:all .12s}.quiz-option:hover:not(:disabled){border-color:var(--fi);background:#f7fbff}.quiz-option.correct{border-color:var(--ok);background:#e9f6ee}.quiz-option.wrong{border-color:var(--bad);background:#fbeaea}.quiz-option:disabled{cursor:default}.explain{margin-top:12px;padding:13px 15px;background:#fff8ec;border:1px solid #f3dca8;border-radius:9px;font-size:14px;line-height:1.5}.search{width:100%;padding:12px 16px;font:inherit;font-size:15px;border:1.5px solid var(--border);border-radius:10px;background:#fff}.search:focus{outline:none;border-color:var(--fi)}.tcode{display:flex;gap:14px;align-items:flex-start;padding:14px 16px;border:1px solid var(--border);border-radius:10px;background:#fff}.tcode .code{font-family:Consolas,Courier New,monospace;font-weight:700;font-size:15px;background:#1d2d3e;color:#fff;padding:5px 10px;border-radius:7px;white-space:nowrap;min-width:66px;text-align:center}.tcode .t-title{font-weight:600;font-size:14.5px}.tcode .t-desc{color:var(--muted);font-size:13px;margin-top:2px;line-height:1.45}.tcode .t-area{font-size:11px;color:var(--muted);margin-top:4px}.pill-row{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:16px}.pill{padding:7px 15px;border-radius:20px;border:1.5px solid var(--border);background:#fff;cursor:pointer;font:inherit;font-size:13.5px;font-weight:600;color:var(--muted)}.pill.active{background:var(--fi);color:#fff;border-color:var(--fi)}.empty{text-align:center;color:var(--muted);padding:40px}@media (max-width: 760px){.app{grid-template-columns:1fr}.sidebar{position:static;height:auto;flex-direction:row;overflow-x:auto;gap:4px;padding:10px}.brand,.sidebar-footer{display:none}.nav-btn{width:auto;white-space:nowrap}.main{padding:20px}.grid.cols-2,.grid.cols-3,.grid.cols-4{grid-template-columns:1fr}}