:root{--bg:#f6f7fb;--card:#fff;--ink:#111827;--muted:#6b7280;--line:#e5e7eb;--brand:#1f4ed8;--ok:#15803d;--warn:#b45309;--bad:#b91c1c;--shadow:0 8px 28px rgba(17,24,39,.08);--radius:18px}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}
button,input,select,textarea{font:inherit}button{cursor:pointer}.app{min-height:100vh}.topbar{position:sticky;top:0;z-index:30;background:rgba(255,255,255,.95);backdrop-filter:blur(12px);border-bottom:1px solid var(--line);padding:12px 16px;display:flex;align-items:center;justify-content:space-between;gap:12px}.brand{display:flex;align-items:center;gap:10px;font-weight:800}.logo{width:36px;height:36px;border-radius:12px;background:linear-gradient(135deg,var(--brand),#6d8cff);display:grid;place-items:center;color:#fff;font-weight:900}.top-actions{display:flex;gap:8px;align-items:center}.btn{border:1px solid var(--line);background:#fff;color:var(--ink);border-radius:12px;padding:10px 14px;font-weight:700}.btn.primary{background:var(--brand);border-color:var(--brand);color:#fff}.btn.small{padding:8px 10px;font-size:.92rem}.page{max-width:1120px;margin:0 auto;padding:22px 16px 80px}.grid{display:grid;gap:18px}.grid.two{grid-template-columns:1fr 1fr}.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:22px}.hero{padding:28px}.hero h1{font-size:clamp(2rem,5vw,3.6rem);line-height:1.04;margin:0 0 12px}.hero p{color:var(--muted);font-size:1.08rem;max-width:720px}.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:22px}.kicker{font-size:.82rem;letter-spacing:.08em;text-transform:uppercase;color:var(--brand);font-weight:800}.muted{color:var(--muted)}.section-title{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:14px}.section-title h2{margin:0}.feature-row{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:16px}.feature{background:#fff;border:1px solid var(--line);border-radius:16px;padding:16px}.feature strong{display:block;margin-bottom:5px}.progress{height:10px;background:#eef0f5;border-radius:999px;overflow:hidden}.progress>div{height:100%;background:var(--brand)}.course-list{display:grid;gap:12px}.lesson{border:1px solid var(--line);border-radius:14px;padding:16px;background:#fff;display:flex;justify-content:space-between;gap:12px;align-items:center}.lesson.done{border-color:#bbf7d0;background:#f0fdf4}.workspace{display:grid;grid-template-columns:230px 1fr 280px;gap:14px}.sidebar,.panel{background:#fff;border:1px solid var(--line);border-radius:16px;padding:14px}.navitem{display:block;width:100%;text-align:left;border:0;background:transparent;border-radius:10px;padding:11px 12px;margin:3px 0;color:var(--ink)}.navitem.active{background:#eef3ff;color:var(--brand);font-weight:800}.segment{background:#fff;border:1px solid var(--line);border-radius:16px;padding:16px;margin-bottom:12px}.segment-head{display:flex;justify-content:space-between;gap:10px;align-items:center;margin-bottom:10px}.status{border-radius:999px;padding:5px 9px;font-size:.78rem;font-weight:800}.status.ready{background:#dcfce7;color:var(--ok)}.status.check{background:#fef3c7;color:var(--warn)}.status.fix{background:#fee2e2;color:var(--bad)}.source{padding:12px;background:#f8fafc;border-radius:12px;border:1px solid var(--line);margin-bottom:10px}.target{width:100%;min-height:88px;border:1px solid #cbd5e1;border-radius:12px;padding:12px;resize:vertical}.actions{display:flex;gap:8px;flex-wrap:wrap;margin-top:10px}.issue{border:1px solid var(--line);border-left:4px solid var(--warn);border-radius:12px;padding:12px;margin-bottom:10px;background:#fff}.issue.fix{border-left-color:var(--bad)}.issue.ready{border-left-color:var(--ok)}.field{display:grid;gap:6px;margin-bottom:12px}.field label{font-weight:700}.field input,.field select{border:1px solid #cbd5e1;border-radius:12px;padding:11px;background:#fff}.modal-wrap{position:fixed;inset:0;background:rgba(17,24,39,.58);z-index:80;display:grid;place-items:center;padding:18px}.modal{width:min(700px,100%);background:#fff;border-radius:22px;padding:24px;box-shadow:0 30px 90px rgba(0,0,0,.25)}.choice-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:18px}.choice{border:2px solid var(--line);border-radius:18px;padding:18px;background:#fff;text-align:left}.choice strong{font-size:1.15rem;display:block;margin-bottom:8px}.toast{position:fixed;right:16px;bottom:18px;background:#111827;color:#fff;padding:12px 16px;border-radius:12px;z-index:100}.lang{border:1px solid var(--line);border-radius:10px;padding:8px;background:#fff}.tabs{display:flex;gap:8px;overflow:auto;padding-bottom:4px}.footer-note{font-size:.86rem;color:var(--muted);margin-top:18px}
@media(max-width:900px){.workspace{grid-template-columns:1fr}.sidebar{display:flex;gap:6px;overflow:auto}.navitem{white-space:nowrap;width:auto}.panel{order:3}.grid.two,.feature-row,.choice-grid{grid-template-columns:1fr}}
@media(max-width:640px){.topbar{padding:10px}.page{padding:14px 10px 80px}.card{padding:16px;border-radius:15px}.hero{padding:20px}.hero-actions .btn{width:100%}.segment{padding:13px}.brand span:last-child{display:none}}