*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}:root{--amber-50: #FAEEDA;--amber-100: #FAC775;--amber-400: #EF9F27;--amber-600: #BA7517;--amber-800: #633806;--amber-900: #412402;--green-light: #EAF3DE;--green-border: #639922;--green-text: #3B6D11;--red-light: #FCEBEB;--red-border: #E24B4A;--red-text: #A32D2D;--bg: #ffffff;--bg-secondary: #f7f6f3;--border: rgba(0, 0, 0, .1);--border-mid: rgba(0, 0, 0, .22);--text: #1a1a1a;--text-secondary: #6b6b6b;--text-tertiary: #9b9b9b;--radius-md: 8px;--radius-lg: 12px;--radius-xl: 16px}@media (prefers-color-scheme: dark){:root{--bg: #1c1c1e;--bg-secondary: #2c2c2e;--border: rgba(255, 255, 255, .1);--border-mid: rgba(255, 255, 255, .22);--text: #f2f2f7;--text-secondary: #aeaeb2;--text-tertiary: #636366}}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--text);line-height:1.6;min-height:100vh}.page-content{max-width:640px;margin:0 auto;padding:1.25rem 1rem 3rem}.mcard{background:var(--bg);border:.5px solid var(--border);border-radius:var(--radius-lg);padding:12px 8px;cursor:pointer;transition:border-color .12s,background .12s;-webkit-user-select:none;user-select:none;text-align:center;min-height:76px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px}.mcard:hover:not(.matched){border-color:var(--amber-600);background:var(--amber-50)}.mcard.selected{border-color:var(--amber-600);background:var(--amber-50);box-shadow:0 0 0 2px #ba751733}.mcard.selected .word-article{color:var(--amber-800)!important}.mcard.selected .word-noun{color:var(--amber-900)!important}.mcard.matched{border-color:var(--green-border);background:var(--green-light);opacity:.65;cursor:default}.mcard.shaking{animation:shake .42s ease}.mcard.popping{animation:pop .28s ease}.word-article{font-size:11px;color:var(--text-secondary);line-height:1;transition:color .12s}.word-noun{font-size:15px;font-weight:600;color:var(--text);line-height:1.2;margin-top:3px;transition:color .12s}.progress-track{background:var(--border);height:5px;border-radius:3px;margin-bottom:1.25rem;overflow:hidden}.progress-fill{height:100%;background:var(--amber-400);border-radius:3px;transition:width .4s ease}.btn{display:inline-flex;align-items:center;gap:6px;padding:9px 18px;border-radius:var(--radius-md);cursor:pointer;font-size:14px;font-weight:500;font-family:inherit;transition:opacity .15s,transform .1s;border:.5px solid var(--border-mid);background:var(--bg-secondary);color:var(--text)}.btn:hover{opacity:.85}.btn:active{transform:scale(.97)}.btn-primary{background:var(--amber-50);border-color:var(--amber-100);color:var(--amber-900)}.btn-ghost{background:transparent;color:var(--text-secondary)}.level-card{background:var(--bg);border:.5px solid var(--border);border-radius:var(--radius-lg);padding:1rem 1.25rem;cursor:pointer;transition:border-color .12s,background .12s;display:flex;align-items:center;gap:14px;text-decoration:none;color:inherit}.level-card:hover{border-color:var(--border-mid);background:var(--bg-secondary)}.stars{color:var(--amber-400);letter-spacing:2px}.pairs-list{background:var(--bg-secondary);border:.5px solid var(--border);border-radius:var(--radius-lg);overflow:hidden;margin:1.25rem 0}.pair-row{display:flex;align-items:center;gap:12px;padding:10px 14px}.pair-row+.pair-row{border-top:.5px solid var(--border)}.nav{background:var(--bg);border-bottom:.5px solid var(--border);padding:0 1rem;height:52px;display:flex;align-items:center;justify-content:space-between;position:sticky;top:0;z-index:10}.nav-brand{font-size:15px;font-weight:600;color:var(--text);text-decoration:none}.nav-links{display:flex;gap:4px}.nav-link{font-size:13px;color:var(--text-secondary);text-decoration:none;padding:5px 8px;border-radius:var(--radius-md);transition:background .12s,color .12s}.nav-link:hover{background:var(--bg-secondary);color:var(--text)}@keyframes shake{20%{transform:translate(-5px)}40%{transform:translate(5px)}60%{transform:translate(-3px)}80%{transform:translate(3px)}to{transform:translate(0)}}@keyframes pop{0%{transform:scale(1)}50%{transform:scale(1.07)}to{transform:scale(1)}}@keyframes fadeIn{0%{opacity:0;transform:translateY(6px)}to{opacity:1;transform:translateY(0)}}.fade-in{animation:fadeIn .3s ease forwards}