:root{--blue-600:#1d4ed8;--blue-500:#2563eb;--blue-400:#3b82f6;--blue-50:#eff6ff;--ink:#0f172a;--slate-600:#475569;--slate-400:#94a3b8;--slate-200:#e2e8f0;--slate-100:#f1f5f9;--white:#ffffff;--radius:10px;--shadow:0 1px 2px rgba(15,23,42,0.06),0 8px 24px rgba(15,23,42,0.06);--maxw:1080px}*{box-sizing:border-box}body,html{margin:0;padding:0}body{font-family:ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;color:var(--ink);background:var(--white);line-height:1.55;-webkit-font-smoothing:antialiased}a{color:var(--blue-600);text-decoration:none}a:hover{text-decoration:underline}h1,h2,h3{letter-spacing:-.02em;line-height:1.15}.container{max-width:var(--maxw);margin:0 auto;padding:0 24px}.nav{border-bottom:1px solid var(--slate-200);background:rgba(255,255,255,.85);-webkit-backdrop-filter:saturate(180%) blur(8px);backdrop-filter:saturate(180%) blur(8px);position:-webkit-sticky;position:sticky;top:0;z-index:20}.nav-inner{gap:20px;height:60px}.brand,.nav-inner{display:flex;align-items:center}.brand{font-weight:700;font-size:18px;color:var(--ink);gap:8px}.brand-dot{width:12px;height:12px;border-radius:4px;background:linear-gradient(135deg,var(--blue-400),var(--blue-600))}.nav-links{display:flex;gap:18px;margin-left:auto;align-items:center}.nav-links a{color:var(--slate-600);font-size:14px;font-weight:500}.nav-links a:hover{color:var(--ink);text-decoration:none}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:10px 18px;border-radius:var(--radius);font-size:14px;font-weight:600;cursor:pointer;border:1px solid transparent;transition:background .15s,border-color .15s,opacity .15s}.btn-primary{background:var(--blue-600);color:var(--white)}.btn-primary:hover{background:var(--blue-500);text-decoration:none}.btn-ghost{background:var(--white);border-color:var(--slate-200);color:var(--ink)}.btn-ghost:hover{background:var(--slate-100);text-decoration:none}.btn:disabled{opacity:.55;cursor:not-allowed}.hero{padding:88px 0 64px;text-align:center}.hero h1{font-size:52px;margin:0 0 20px}.hero .accent{background:linear-gradient(135deg,var(--blue-400),var(--blue-600));-webkit-background-clip:text;background-clip:text;color:transparent}.hero p{font-size:19px;color:var(--slate-600);max-width:620px;margin:0 auto 32px}.hero-actions{display:flex;gap:12px;justify-content:center}.features{display:grid;grid-template-columns:repeat(3,1fr);grid-gap:20px;gap:20px;padding:40px 0 88px}.card{border:1px solid var(--slate-200);border-radius:14px;padding:24px;background:var(--white);box-shadow:var(--shadow)}.card h3{margin:8px 0;font-size:18px}.card p{margin:0;color:var(--slate-600);font-size:15px}.card .ico{width:38px;height:38px;border-radius:10px;background:var(--blue-50);color:var(--blue-600);display:grid;place-items:center;font-size:20px}.panel{max-width:420px;margin:64px auto;border:1px solid var(--slate-200);border-radius:16px;padding:32px;box-shadow:var(--shadow)}.panel h1{font-size:26px;margin:0 0 4px}.panel .sub{color:var(--slate-600);margin:0 0 24px;font-size:15px}.field{margin-bottom:16px}.field label{display:block;font-size:13px;font-weight:600;color:var(--slate-600);margin-bottom:6px}.input{width:100%;padding:11px 12px;border:1px solid var(--slate-200);border-radius:var(--radius);font-size:15px;outline:none;transition:border-color .15s,box-shadow .15s}.input:focus{border-color:var(--blue-400);box-shadow:0 0 0 3px var(--blue-50)}.error{background:#fef2f2;color:#b91c1c;border:1px solid #fecaca;padding:10px 12px;border-radius:var(--radius);margin-bottom:16px}.error,.muted{font-size:14px}.muted{color:var(--slate-600)}.page{padding:40px 0 80px}.page-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:24px}.page-head h1{font-size:30px;margin:0}.vocab-list{display:grid;grid-gap:12px;gap:12px}.vocab-item{display:flex;align-items:center;gap:16px;border:1px solid var(--slate-200);border-radius:12px;padding:16px 18px;background:var(--white)}.vocab-term{font-weight:600;font-size:16px}.vocab-trans{color:var(--blue-600);font-size:15px}.vocab-context{color:var(--slate-400);font-size:13px;font-style:italic;margin-top:2px}.vocab-meta{margin-left:auto;text-align:right;font-size:12px;color:var(--slate-400);white-space:nowrap}.badge{padding:2px 8px;background:var(--blue-50);color:var(--blue-600);font-size:12px}.badge,.badge-type{display:inline-block;border-radius:999px;font-weight:600}.badge-type{margin-left:8px;padding:1px 8px;background:var(--slate-100);color:var(--slate-600);font-size:11px;text-transform:uppercase;letter-spacing:.03em;vertical-align:2px}.vocab-def{color:var(--slate-600);font-size:14px;margin-top:2px}.vocab-senses{margin-top:6px}.vocab-more-btn{padding:0;border:0;background:none;color:var(--slate-600);font-size:13px;font-family:inherit;cursor:pointer}.vocab-more-btn:hover{color:var(--blue-600)}.vocab-sense{display:block;width:100%;margin-top:4px;padding:6px 10px;border:1px solid var(--slate-200);border-radius:8px;background:var(--white);color:var(--slate-600);font-size:13px;font-family:inherit;text-align:left;line-height:1.45;cursor:pointer}.vocab-sense:hover:not(:disabled){border-color:var(--blue-600);background:var(--slate-100)}.vocab-sense:disabled{cursor:default}.vocab-sense.selected{border-color:var(--blue-600);color:var(--ink);font-weight:500}.vocab-sense-pos{margin-right:6px;color:var(--slate-400);font-style:italic}.vocab-sense-row{display:flex;align-items:stretch;gap:6px}.vocab-sense-row .vocab-sense{flex:1 1}.vocab-sense-add{margin-top:4px;padding:0 10px;border:1px dashed var(--slate-200);border-radius:8px;background:none;color:var(--slate-400);font-size:12px;font-family:inherit;cursor:pointer;white-space:nowrap}.vocab-sense-add:hover{color:var(--blue-600);border-color:var(--blue-400)}.vocab-sense-add:disabled{cursor:default;opacity:.5}.vocab-saved-senses{display:flex;flex-direction:column;gap:4px;margin-top:6px}.vocab-subsense{display:inline-flex;align-items:center;gap:6px;font-size:13px;color:var(--slate-600);background:var(--blue-50);border:1px solid var(--slate-200);border-radius:8px;padding:5px 8px}.vocab-subsense-topic{font-weight:600;color:var(--blue-600);white-space:nowrap}.vocab-subsense-gloss{flex:1 1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.vocab-subsense-remove{border:none;background:none;color:var(--slate-400);cursor:pointer;font-size:12px;padding:0 2px;flex:none}.vocab-subsense-remove:hover{color:var(--ink)}.badge-sense{background:var(--blue-50);color:var(--blue-600)}.add-form{display:flex;gap:10px;margin-bottom:20px}.add-form .input{flex:1 1}.add-form .input.ctx{flex:1.6 1}.group-section{margin-bottom:28px}.group-head{display:flex;align-items:baseline;gap:10px;margin:0 0 10px}.group-dot{width:10px;height:10px;border-radius:50%;flex:none;align-self:center}.group-toggle{padding:0 2px;border:0;background:none;color:var(--slate-400);font-size:14px;font-family:inherit;cursor:pointer;align-self:center;line-height:1}.group-toggle:hover{color:var(--blue-600)}.group-head h2{cursor:pointer;-webkit-user-select:none;-moz-user-select:none;user-select:none;font-size:18px;margin:0;text-transform:capitalize}.empty{text-align:center;padding:64px 24px;border:1px dashed var(--slate-200);border-radius:16px;color:var(--slate-600)}.flashcard{max-width:520px;margin:24px auto;border:1px solid var(--slate-200);border-radius:18px;padding:48px 32px;text-align:center;box-shadow:var(--shadow);min-height:220px;display:flex;flex-direction:column;justify-content:center}.flashcard .term{font-size:34px;font-weight:700}.flashcard .ctx{color:var(--slate-400);font-style:italic;margin-top:12px}.flashcard .def{color:var(--slate-600);font-size:15px;margin-top:16px}.flashcard .answer{font-size:26px;color:var(--blue-600);font-weight:600;margin-top:20px}.review-senses{margin-top:20px;text-align:left}.review-sense{margin-top:4px;padding:6px 10px;border:1px solid var(--slate-200);border-radius:8px;color:var(--slate-600);font-size:13px;line-height:1.45}.review-sense.selected{border-color:var(--blue-600);color:var(--ink)}.review-sense-saved{background:var(--blue-50)}.grade-row{display:flex;gap:10px;justify-content:center;max-width:520px;margin:0 auto}.grade-row .btn{flex:1 1}.progress{text-align:center;color:var(--slate-600);font-size:14px;margin-bottom:8px}.seg{display:inline-flex;border:1px solid var(--slate-200);border-radius:10px;overflow:hidden}.seg,.seg-btn{background:var(--white)}.seg-btn{padding:8px 16px;font-size:14px;font-weight:600;border:none;color:var(--slate-600);cursor:pointer}.seg-btn.active{background:var(--blue-600);color:var(--white)}.notice{display:flex;align-items:center;gap:14px;justify-content:space-between;background:var(--blue-50);border:1px solid #bfdbfe;color:var(--ink);padding:12px 16px;border-radius:12px;font-size:14px;margin-bottom:16px}.map-wrap{position:relative;border:1px solid var(--slate-200);border-radius:16px;background:radial-gradient(circle at 1px 1px,var(--slate-100) 1px,transparent 0) 0 0 /24px 24px,var(--white);box-shadow:var(--shadow);overflow:hidden}.map-svg{width:100%;height:auto;display:block;cursor:-webkit-grab;cursor:grab;touch-action:none}.map-svg.grabbing{cursor:-webkit-grabbing;cursor:grabbing}.map-node{cursor:pointer}.map-label{font-weight:600;fill:var(--ink);paint-order:stroke;stroke:#fff;stroke-width:3px;stroke-linejoin:round;pointer-events:none}.map-hull{cursor:pointer}.map-cluster-label{font-weight:800;letter-spacing:.01em;paint-order:stroke;stroke:rgba(255,255,255,.85);stroke-width:4px;stroke-linejoin:round;pointer-events:none;-webkit-user-select:none;-moz-user-select:none;user-select:none}.map-search{position:relative;min-width:220px}.map-search input{width:100%;padding:8px 12px;border:1px solid var(--slate-200);border-radius:10px;font-size:14px;background:var(--white)}.map-search input:focus{outline:2px solid var(--blue-400);outline-offset:-1px}.map-search-results{position:absolute;top:calc(100% + 6px);left:0;right:0;background:var(--white);border:1px solid var(--slate-200);border-radius:12px;box-shadow:var(--shadow);overflow:hidden;z-index:30}.map-search-hit{display:flex;align-items:center;justify-content:space-between;gap:8px;width:100%;padding:8px 12px;border:none;background:transparent;cursor:pointer;text-align:left;font-size:14px}.map-search-hit:hover{background:var(--slate-100)}.map-search-term{font-weight:600;color:var(--ink)}.map-search-cluster{font-size:12px;color:var(--slate-400);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.map-zoom{position:absolute;top:14px;right:14px;display:flex;flex-direction:column;gap:6px}.map-zoom button{width:34px;height:34px;border:1px solid var(--slate-200);background:rgba(255,255,255,.92);border-radius:9px;font-size:18px;line-height:1;color:var(--ink);cursor:pointer;box-shadow:var(--shadow);display:grid;place-items:center}.map-zoom button:hover{background:var(--slate-100);border-color:var(--blue-400)}.map-info{position:absolute;left:16px;bottom:16px;display:flex;align-items:center;gap:12px;background:var(--white);border:1px solid var(--slate-200);border-radius:12px;padding:12px 16px;box-shadow:var(--shadow);min-width:160px}.map-info-dot{width:12px;height:12px;border-radius:50%;flex:none}.map-focus{position:absolute;left:16px;top:16px;bottom:16px;width:248px;background:var(--white);border:1px solid var(--slate-200);border-radius:14px;padding:14px;box-shadow:var(--shadow);overflow-y:auto}.map-focus-head{display:flex;align-items:center;gap:10px;margin-bottom:12px}.map-focus-close{border:none;background:transparent;color:var(--slate-400);font-size:14px;cursor:pointer;padding:2px 4px}.map-focus-close:hover{color:var(--ink)}.map-focus-sub{font-size:12px;font-weight:700;text-transform:uppercase;letter-spacing:.04em;color:var(--slate-400);margin-bottom:8px}.map-nb{display:flex;align-items:center;gap:8px;width:100%;border:none;background:transparent;padding:6px 4px;border-radius:8px;cursor:pointer;text-align:left}.map-nb:hover{background:var(--slate-100)}.map-nb-term{flex:1 1;font-size:14px;font-weight:500;color:var(--ink);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.map-nb-bar{width:52px;height:6px;border-radius:4px;background:var(--slate-100);overflow:hidden;flex:none}.map-nb-fill{display:block;height:100%;background:linear-gradient(90deg,var(--blue-400),var(--blue-600))}.map-nb-pct{font-size:12px;color:var(--slate-600);width:32px;text-align:right;flex:none}.map-info-term{font-weight:700;font-size:16px}.map-info-trans{color:var(--blue-600);font-size:14px;margin-top:2px}.map-info-cluster{color:var(--slate-400);font-size:12px;margin-top:2px;text-transform:capitalize}.map-info-gloss{color:var(--slate-600);font-size:13px;margin:6px 0 10px;line-height:1.45;max-width:260px}.legend{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:12px}.legend-chip{display:inline-flex;align-items:center;gap:6px;font-size:12px;color:var(--slate-600);border:1px solid var(--slate-200);padding:3px 10px;border-radius:999px;background:var(--white);font-family:inherit}button.legend-chip{cursor:pointer}button.legend-chip:hover{border-color:var(--blue-400);background:var(--blue-50)}.legend-count{color:var(--slate-400);font-size:11px}.legend-dot{width:8px;height:8px;border-radius:50%;flex:none}.footer{border-top:1px solid var(--slate-200);padding:28px 0;color:var(--slate-400);font-size:14px;text-align:center}.footer-inner{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap}.footer-links{display:inline-flex;gap:16px}.footer-links a{color:var(--slate-400)}.footer-links a:hover{color:var(--slate-600)}.modal-overlay{position:fixed;inset:0;z-index:100;background:rgba(15,23,42,.45);display:flex;align-items:flex-start;justify-content:center;padding:10vh 16px 16px;overflow-y:auto}.modal{position:relative;width:100%;max-width:420px;background:var(--white);border:1px solid var(--slate-200);border-radius:16px;padding:32px;box-shadow:var(--shadow)}.modal h2{font-size:26px;margin:0 0 4px}.modal .sub{color:var(--slate-600);margin:0 0 24px;font-size:15px}.modal-close{position:absolute;top:12px;right:12px;border:none;background:none;color:var(--slate-400);font-size:15px;cursor:pointer;padding:6px;border-radius:var(--radius)}.modal-close:hover{color:var(--ink);background:var(--slate-100)}.divider{display:flex;align-items:center;gap:12px;color:var(--slate-400);font-size:13px;margin:18px 0}.divider:after,.divider:before{content:"";flex:1 1;height:1px;background:var(--slate-200)}.btn-google{width:100%;background:var(--white);border-color:var(--slate-200);color:var(--ink)}.btn-google:hover{background:var(--slate-100);text-decoration:none}.checkbox-field{display:flex;align-items:flex-start;gap:8px;margin:4px 0 16px;font-size:14px;color:var(--slate-600)}.checkbox-field input{margin-top:3px;accent-color:var(--blue-600)}.consent-note{margin-top:12px;text-align:center;font-size:13px}.legal{max-width:720px;padding-top:48px;padding-bottom:64px}.legal h1{font-size:34px;margin-bottom:4px}.legal h2{font-size:19px;margin:28px 0 8px}.legal li,.legal p{color:var(--slate-600);line-height:1.65;font-size:15px}.legal ul{padding-left:22px;margin:8px 0}@media (max-width:760px){.features{grid-template-columns:1fr}.hero h1{font-size:38px}.footer-inner{justify-content:center}}