:root{--bg: #f5f7f8;--panel: #ffffff;--panel-soft: #fbfcfc;--text: #202124;--muted: #687076;--muted-strong: #42515a;--border: #dce3e6;--border-strong: #cfd8dc;--control: #e8eef0;--accent: #0f766e;--accent-soft: rgba(15, 118, 110, .12);--success-bg: #e8f7ed;--success-text: #176b35;--success-border: #17803d;--danger-bg: #fff1f0;--danger-text: #9f1f14;--danger-border: #b42318;--notice-bg: #fff8dd;--notice-border: #f2c94c;color:var(--text);background:var(--bg);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;letter-spacing:0}[data-theme=dark]{--bg: #111827;--panel: #18212f;--panel-soft: #131c28;--text: #eef2f7;--muted: #a8b3c3;--muted-strong: #c8d2df;--border: #2d3a4d;--border-strong: #40516a;--control: #263244;--accent: #2dd4bf;--accent-soft: rgba(45, 212, 191, .16);--success-bg: #123624;--success-text: #9be7b5;--success-border: #38b66c;--danger-bg: #3b1817;--danger-text: #ffb4aa;--danger-border: #f87171;--notice-bg: #352d16;--notice-border: #c99a24}*{box-sizing:border-box}body{margin:0;background:var(--bg)}button,select,input{font:inherit}button{border:0;cursor:pointer}button:disabled{cursor:not-allowed;opacity:.55}.app-shell{width:min(1200px,calc(100% - 32px));margin:0 auto;padding:40px 0}.topbar{display:flex;align-items:end;justify-content:space-between;gap:24px;margin-bottom:32px}.topbar.home{align-items:start}.topbar h1{max-width:760px;margin:8px 0 0;font-size:clamp(1.8rem,5vw,4.5rem);line-height:1.1;font-weight:600}.eyebrow{margin:0;color:var(--muted);font-size:.78rem;font-weight:700;text-transform:uppercase}select{min-width:min(390px,100%);border:1px solid var(--border-strong);border-radius:8px;background:var(--panel);color:var(--text);padding:10px 12px;cursor:pointer;transition:border-color .2s ease}select:hover{border-color:var(--accent)}select:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px 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ease}.search-box:focus-within{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}.search-box input{width:100%;border:0;outline:0;background:transparent;color:var(--text);font-size:.95rem}.search-box input::placeholder{color:var(--muted)}.exam-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:16px}.exam-card{display:flex;flex-direction:column;height:100%;min-height:220px;border:1px solid var(--border);border-radius:10px;background:var(--panel);color:var(--text);padding:20px;text-align:left;transition:all .2s ease}.exam-card:hover{border-color:var(--accent);box-shadow:0 12px 30px var(--accent-soft);transform:translateY(-2px)}.exam-card-header{display:flex;align-items:flex-start;justify-content:space-between;gap:12px;margin-bottom:12px}.star-button{flex-shrink:0;background:transparent;border:none;color:var(--muted);padding:4px 0;display:flex;align-items:center;transition:color .2s ease;cursor:pointer}.star-button:hover{color:var(--accent)}.star-button.active{color:#fbbf24;fill:#fbbf24}.exam-card span{display:inline-block;border-radius:6px;background:var(--control);padding:5px 10px;color:var(--muted-strong);font-size:.75rem;font-weight:700;text-transform:uppercase;letter-spacing:.5px;white-space:nowrap;border:1px solid var(--border)}.exam-card strong{font-size:1.1rem;font-weight:600;line-height:1.4;margin-bottom:16px;flex-grow:1;display:-webkit-box;line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}.exam-card>div{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;margin-top:auto}.exam-card p{border-radius:6px;background:var(--bg);color:var(--muted-strong);margin:0;padding:10px 8px;font-size:.8rem;font-weight:600;text-align:center;line-height:1.2}.stats-grid{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:14px;margin-bottom:20px}.stat{border:1px solid var(--border);border-radius:8px;background:var(--panel);padding:16px;transition:border-color .2s ease}.stat:hover{border-color:var(--control)}.stat span{display:block;color:var(--muted);font-size:.8rem;font-weight:500;margin-bottom:8px;text-transform:uppercase;letter-spacing:.3px}.stat strong{font-size:1.7rem;font-weight:600;color:var(--text);line-height:1.2}.workspace{display:grid;grid-template-columns:220px minmax(0,1fr);gap:18px;align-items:start}.side-panel{display:grid;gap:8px;border-right:1px solid var(--border);padding-right:16px}.side-panel button,.actions button,.review{min-height:44px;border-radius:8px;background:var(--control);color:var(--text);padding:0 14px;font-weight:700}.side-panel button{text-align:left}.side-panel button.active,.actions 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span{display:grid;place-items:center;width:34px;height:34px;border-radius:8px;background:var(--control);font-weight:800}.answer p{margin:0;line-height:1.45}.answer.selected{border-color:var(--accent);box-shadow:0 0 0 2px var(--accent-soft)}.answer.correct{border-color:var(--success-border);background:var(--success-bg)}.answer.wrong{border-color:var(--danger-border);background:var(--danger-bg)}.result{margin-top:16px;border-radius:8px;padding:12px 14px;font-weight:800}.result.correct{background:var(--success-bg);color:var(--success-text)}.result.wrong{background:var(--danger-bg);color:var(--danger-text)}.actions{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-top:22px}.actions a{color:var(--accent);font-weight:700}.actions div{display:flex;gap:10px}.actions button{display:inline-flex;align-items:center;gap:8px}.empty{min-height:420px;display:grid;place-content:center;justify-items:center;color:#687076;color:var(--muted);text-align:center}.empty h2{margin:12px 0 4px;color:var(--text)}.empty.compact{min-height:180px}@media(max-width:820px){.topbar,.question-header,.actions{align-items:stretch;flex-direction:column}.stats-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.workspace{grid-template-columns:1fr}.side-panel{grid-template-columns:repeat(2,minmax(0,1fr));border-right:0;border-bottom:1px solid var(--border);padding-right:0;padding-bottom:16px}.actions div{width:100%}.actions button{flex:1;justify-content:center}.exam-grid{grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:14px}.exam-card>div{grid-template-columns:1fr}}@media(max-width:520px){.app-shell{width:min(100% - 20px,1180px);padding:18px 0 28px}.topbar{gap:16px;margin-bottom:16px}.topbar 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ease}.login-button:hover{opacity:.9;transform:translateY(-1px)}.login-button:active{transform:translateY(0)}.login-button:disabled{opacity:.55;transform:none;cursor:not-allowed}.current-user{font-size:.85rem;font-weight:500;color:var(--muted-strong);padding:0 6px}