body{margin:0}#root{min-height:100svh}:root{--bg:#071a1a;--bg-glow:radial-gradient(ellipse 900px 500px at 50% -10%, #2dd4bf29, transparent 60%);--surface:#1436368c;--surface-2:#ffffff0a;--border:#5eead424;--text:#eafffb;--muted:#7fb3ab;--accent:#2dd4bf;--accent-2:#22b8ea;--accent-hover:#5eead4;--accent-contrast:#04231f;--danger:#fb7185;--success:#34d399;--shadow:0 20px 40px -20px #0009;--glow:0 0 0 1px var(--border), 0 8px 24px -8px #2dd4bf40}*{box-sizing:border-box}body{background:var(--bg-glow), var(--bg);color:var(--text);-webkit-font-smoothing:antialiased;background-attachment:fixed;margin:0;font-family:Segoe UI,system-ui,-apple-system,Roboto,sans-serif}.app{max-width:760px;margin:0 auto;padding:2rem 1.25rem 4rem}.app-header{flex-direction:column;gap:1.25rem;margin-bottom:2.25rem;display:flex}.app-header h1{letter-spacing:-.02px;background:linear-gradient(90deg, var(--accent-hover), var(--accent-2));color:#0000;-webkit-background-clip:text;background-clip:text;width:fit-content;margin:0;font-size:2rem;font-weight:700}.tabs{background:var(--surface-2);border:1px solid var(--border);border-radius:14px;gap:.35rem;width:fit-content;padding:.35rem;display:flex}.tabs button{color:var(--muted);cursor:pointer;background:0 0;border:none;border-radius:10px;padding:.55rem 1.15rem;font-size:.9rem;font-weight:500;transition:background .2s,color .2s}.tabs button:hover{color:var(--text)}.tabs button.active{background:linear-gradient(135deg, var(--accent), var(--accent-2));color:var(--accent-contrast);box-shadow:0 4px 14px -4px #2dd4bf80}button{font-family:inherit}input[type=text]{background:var(--surface-2);border:1px solid var(--border);color:var(--text);border-radius:10px;padding:.65rem .85rem;font-family:inherit;font-size:.95rem;transition:border-color .15s,box-shadow .15s}input[type=text]::placeholder{color:var(--muted)}input[type=text]:focus{border-color:var(--accent);outline:none;box-shadow:0 0 0 3px #2dd4bf2e}.new-list-form,.new-word-form{gap:.5rem;margin-bottom:1.25rem;display:flex}.new-list-form input,.new-word-form input{flex:1}.new-list-form button,.new-word-form button,.session-setup button,.session-result button{background:linear-gradient(135deg, var(--accent), var(--accent-2));color:var(--accent-contrast);cursor:pointer;border:none;border-radius:10px;padding:.65rem 1.15rem;font-size:.9rem;font-weight:600;transition:transform .15s,box-shadow .15s,opacity .15s;box-shadow:0 6px 16px -6px #2dd4bf73}.new-list-form button:hover,.new-word-form button:hover,.session-setup button:hover:not(:disabled),.session-result button:hover{transform:translateY(-1px);box-shadow:0 10px 22px -6px #2dd4bf8c}.session-setup button:disabled{opacity:.4;cursor:not-allowed;box-shadow:none}.empty-hint{color:var(--muted);font-style:italic}.lists{flex-direction:column;gap:.75rem;display:flex}.list-card{background:var(--surface);border:1px solid var(--border);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-radius:16px;transition:border-color .2s;overflow:hidden}.list-card:hover{border-color:#5eead44d}.list-card-header{cursor:pointer;align-items:center;gap:.75rem;padding:1rem 1.15rem;display:flex}.list-card-header h3{flex:1;margin:0;font-size:1.05rem;font-weight:600}.word-count{color:var(--muted);background:var(--surface-2);border:1px solid var(--border);border-radius:999px;padding:.25rem .6rem;font-size:.8rem}.list-card-body{border-top:1px solid var(--border);padding:1.15rem}.delete-btn{color:var(--danger);cursor:pointer;background:0 0;border:1px solid #fb718566;border-radius:8px;padding:.35rem .7rem;font-size:.8rem;transition:background .15s,color .15s}.delete-btn:hover{background:var(--danger);color:#200a0d;border-color:var(--danger)}.word-table{border-collapse:collapse;width:100%}.word-table th{text-align:left;color:var(--muted);text-transform:uppercase;letter-spacing:.04em;border-bottom:1px solid var(--border);padding:.4rem .5rem;font-size:.8rem;font-weight:500}.word-table td{border-bottom:1px solid #5eead414;padding:.6rem .5rem}.flashcards{flex-direction:column;align-items:center;gap:1.5rem;display:flex}.session-setup{gap:.75rem;width:100%;display:flex}.dropdown{flex:1;position:relative}.dropdown-trigger{background:var(--surface-2);width:100%;color:var(--text);border:1px solid var(--border);cursor:pointer;text-align:left;border-radius:10px;justify-content:space-between;align-items:center;gap:.5rem;padding:.65rem .85rem;font-size:.95rem;transition:border-color .15s,box-shadow .15s;display:flex}.dropdown-trigger:hover{border-color:#5eead459}.dropdown-trigger.open{border-color:var(--accent);box-shadow:0 0 0 3px #2dd4bf2e}.dropdown-placeholder{color:var(--muted)}.dropdown-arrow{color:var(--accent);font-size:.75rem;transition:transform .15s}.dropdown-trigger.open .dropdown-arrow{transform:rotate(180deg)}.dropdown-menu{z-index:10;border:1px solid var(--border);box-shadow:var(--shadow);background:#0d2b2b;border-radius:12px;max-height:260px;margin:0;padding:.35rem;list-style:none;position:absolute;top:calc(100% + .4rem);left:0;right:0;overflow-y:auto}.dropdown-option{cursor:pointer;border-radius:8px;padding:.6rem .75rem;font-size:.9rem;transition:background .12s}.dropdown-option:hover:not(.disabled){background:#2dd4bf24}.dropdown-option.selected{color:var(--accent-hover);background:#2dd4bf38;font-weight:600}.dropdown-option.disabled{color:var(--muted);opacity:.5;cursor:not-allowed}.progress{color:var(--muted);letter-spacing:.02em;margin:0;font-size:.9rem}.flashcard-scene{perspective:1400px;cursor:pointer;width:100%;max-width:420px;height:260px}.flashcard-inner{width:100%;height:100%;transform-style:preserve-3d;transition:transform .6s cubic-bezier(.4,.2,.2,1);position:relative}.flashcard-inner:hover{transform:translateY(-2px)}.flashcard-inner.flipped{transform:rotateY(180deg)}.flashcard-inner.flipped:hover{transform:rotateY(180deg)translateY(-2px)}.flashcard-face{backface-visibility:hidden;-webkit-user-select:none;user-select:none;box-shadow:var(--shadow), var(--glow);border-radius:20px;flex-direction:column;justify-content:center;align-items:center;gap:.75rem;padding:0 1.75rem;display:flex;position:absolute;inset:0}.flashcard-front{border:1px solid var(--border);background:linear-gradient(160deg,#143636d9,#0a2020e6)}.flashcard-back{background:linear-gradient(160deg, var(--accent), var(--accent-2));color:var(--accent-contrast);transform:rotateY(180deg)}.flashcard-content{text-align:center;font-size:1.9rem;font-weight:700;line-height:1.2}.flip-hint{color:var(--muted);font-size:.8rem}.flashcard-back .flip-hint{color:#04231fa6}.answer-buttons{gap:1rem;display:flex}.answer-buttons button{cursor:pointer;color:#fff;border:none;border-radius:12px;padding:.75rem 1.6rem;font-size:.95rem;font-weight:600;transition:transform .15s,box-shadow .15s}.answer-buttons button:hover{transform:translateY(-1px)}.known-btn{background:linear-gradient(135deg, var(--success), #10b981);box-shadow:0 6px 16px -6px #34d39980}.unknown-btn{background:linear-gradient(135deg, var(--danger), #f43f5e);box-shadow:0 6px 16px -6px #fb718580}.session-result{text-align:center;background:var(--surface);border:1px solid var(--border);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-radius:20px;flex-direction:column;align-items:center;gap:.85rem;padding:2rem 2.5rem;display:flex}.session-result h3{background:linear-gradient(90deg, var(--accent-hover), var(--accent-2));color:#0000;-webkit-background-clip:text;background-clip:text;margin:0;font-size:1.5rem}