*{box-sizing:border-box}
:root{--navy:#071b49;--navy2:#0d347d;--yellow:#ffcc29;--red:#e43d30;--orange:#ff6b21;--blue:#0b63ce;--green:#20a46b;--bg:#f2f5f8;--ink:#172033;--muted:#718096}
html{background:var(--bg)}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;background:var(--bg);color:var(--ink);-webkit-tap-highlight-color:transparent}
button,input,select,textarea{font:inherit}button{cursor:pointer;-webkit-appearance:none}.topbar{height:68px;background:var(--navy);color:#fff;display:flex;align-items:center;justify-content:space-between;padding:0 22px;position:sticky;top:0;z-index:10}
.brand{display:flex;align-items:center;gap:10px}.brand b{display:block;font-size:20px}.brand small{display:block;opacity:.7;letter-spacing:2px;font-size:9px}.helmet{font-size:31px}.ghost{background:transparent;border:1px solid #ffffff55;color:#fff;border-radius:10px;padding:9px 13px}
.app{display:flex;min-height:calc(100vh - 68px)}.sidebar{width:250px;background:#061746;padding:18px 12px;display:flex;flex-direction:column;gap:8px;flex-shrink:0}.nav{border:0;background:#fff;color:var(--ink);text-align:left;border-radius:10px;padding:13px 14px;font-weight:650;display:flex;gap:10px;align-items:center;min-height:48px}.nav.active{background:var(--yellow);color:#141414}.side-bottom{margin-top:auto}.upload{position:relative}.upload input{position:absolute;inset:0;opacity:0}
.content{flex:1;padding:28px;max-width:1500px;margin:auto;width:100%}.hero{background:linear-gradient(135deg,var(--navy),var(--navy2));color:white;border-radius:18px;padding:26px;margin-bottom:20px;box-shadow:0 10px 30px #071b4920}.hero h1{margin:0 0 7px;font-size:30px}.hero p{margin:0;color:#dce7ff}
.grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}.card{background:#fff;border:1px solid #e1e7ee;border-radius:15px;padding:18px;box-shadow:0 5px 20px #1720330b}.stat{min-height:112px}.stat b{font-size:30px;display:block}.stat span{color:#6c7788;font-size:13px}.accent{border-left:5px solid var(--red)}.section{margin-top:20px}.section h2{font-size:20px}.row{display:flex;gap:10px;align-items:center;justify-content:space-between}.actions{display:flex;gap:8px;flex-wrap:wrap}.primary{background:var(--red);color:white;border:0;border-radius:10px;padding:11px 16px;font-weight:700}.yellow{background:var(--yellow);color:#171717;border:0;border-radius:10px;padding:11px 16px;font-weight:700}.blue{background:var(--blue);color:#fff;border:0;border-radius:10px;padding:11px 16px;font-weight:700}.green{background:var(--green);color:#fff;border:0;border-radius:10px;padding:11px 16px;font-weight:700}.danger{background:#f3d7d4;color:#a4261e;border:0;border-radius:10px;padding:9px 12px}.muted{color:var(--muted)}
.table{width:100%;border-collapse:collapse}.table th,.table td{padding:13px 9px;border-bottom:1px solid #e6ebf0;text-align:left;vertical-align:top}.table th{color:#687486;font-size:13px}.tag{display:inline-block;padding:5px 9px;background:#eaf1ff;color:#164b9b;border-radius:20px;font-size:12px}.form{display:grid;gap:12px}.form label{font-weight:650;font-size:14px}.form input,.form textarea,.form select{width:100%;padding:12px;border:1px solid #cdd6e1;border-radius:9px;background:#fff}.form textarea{min-height:90px;resize:vertical}
.answer{display:grid;grid-template-columns:1fr auto;gap:8px;align-items:center}.answer input[type=radio]{width:20px;height:20px}.chips{display:flex;gap:8px;flex-wrap:wrap}.chip{border:1px solid #cbd5e1;background:#fff;border-radius:20px;padding:8px 12px}.chip.selected{background:var(--navy);color:white;border-color:var(--navy)}
.empty{padding:35px;text-align:center;color:#738095}.progress{height:10px;background:#e7edf3;border-radius:99px;overflow:hidden}.progress>i{display:block;height:100%;background:var(--red);transition:width .2s}.bar{height:14px;background:#e8edf2;border-radius:99px;overflow:hidden}.bar i{display:block;height:100%;background:var(--orange)}
.folder{background:#fff;border:1px solid #e1e7ee;border-radius:13px;padding:14px;margin-bottom:10px}.folder .children{margin:10px 0 0 22px;padding-left:10px;border-left:2px solid #e8edf2}.folder-row{display:flex;gap:10px;align-items:center;justify-content:space-between}.folder-title{display:flex;gap:8px;align-items:center}.folder-meta{color:var(--muted);font-size:12px}.tree-add{font-size:12px;padding:7px 10px}
.review-card{font-size:20px;line-height:1.5}.rating{display:grid;grid-template-columns:repeat(4,1fr);gap:8px}.rating button{padding:14px 8px;border:0;border-radius:11px;background:#eaf0f6}.rating .again{background:#fff0ed}.rating .hard{background:#fff7dd}.rating .good{background:#eefaf4}.rating .easy{background:#eaf1ff}
.question-box{border:1px solid #e1e7ee;border-radius:14px;padding:18px;margin-top:14px}.test-option{display:block;width:100%;border:2px solid #e2e8f0;background:#fff;padding:14px;border-radius:12px;margin:8px 0;text-align:left}.test-option.correct{border-color:#25a56a;background:#eefaf4}.test-option.wrong{border-color:var(--red);background:#fff1ef}
.metric-line{display:grid;grid-template-columns:170px 1fr 60px;gap:10px;align-items:center;margin:10px 0}.metric-line .bar{height:12px}.mini{font-size:12px}.kpi{font-size:24px;font-weight:800}.notice{padding:12px 14px;border-radius:10px;background:#fff7dd;border:1px solid #f0d98b}.danger-note{background:#fff1ef;border-color:#f1b3ad}.success-note{background:#eefaf4;border-color:#b9e4ce}
.modal{position:fixed;inset:0;background:#071b4970;display:grid;place-items:center;padding:18px;z-index:20}.modal-card{background:white;border-radius:18px;max-width:760px;width:100%;max-height:92vh;overflow:auto;padding:24px;position:relative}.x{position:absolute;right:12px;top:8px;border:0;background:none;font-size:30px}.toast{position:fixed;bottom:20px;left:50%;transform:translateX(-50%);background:var(--navy);color:white;padding:12px 18px;border-radius:10px;opacity:0;pointer-events:none;transition:.2s;z-index:30}.toast.show{opacity:1}.hidden{display:none!important}.list-actions{display:flex;gap:5px;flex-wrap:wrap}.small{font-size:12px}.pill{display:inline-block;border-radius:99px;padding:4px 8px;font-size:11px;font-weight:700}.pill.red{background:#ffe2df;color:#a4261e}.pill.green{background:#e3f7ed;color:#17724e}.pill.blue{background:#e6efff;color:#174e9e}
@media(max-width:950px){.sidebar{width:76px;padding:10px 8px}.nav{justify-content:center;padding:13px 7px}.nav span{display:none}.content{padding:16px}.grid,.grid-3{grid-template-columns:repeat(2,1fr)}.brand div{display:none}.metric-line{grid-template-columns:120px 1fr 50px}}
@media(max-width:560px){.grid,.grid-3{grid-template-columns:1fr}.topbar{padding:0 12px}.rating{grid-template-columns:repeat(2,1fr)}.content{padding:10px}.table{font-size:13px}.sidebar{width:64px}.hero h1{font-size:24px}.metric-line{grid-template-columns:95px 1fr 45px;font-size:12px}.modal-card{padding:18px}}