@import url("https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap");:root{--bg-primary:#f5f5fa;--bg-secondary:#ffffff;--bg-tertiary:#eeeef4;--bg-card:rgba(255,255,255,0.85);--bg-elevated:#ffffff;--bg-input:#f0f0f6;--text-primary:#1a1a2e;--text-secondary:#5a5a78;--text-tertiary:#8888a0;--text-muted:#9898b0;--accent:#6c5ce7;--accent-light:#5a4bd4;--accent-glow:rgba(108,92,231,0.12);--accent-dim:#4a3db8;--success:#00b894;--success-bg:rgba(0,184,148,0.1);--warning:#e17000;--warning-bg:rgba(225,112,0,0.1);--danger:#e74c3c;--danger-bg:rgba(231,76,60,0.1);--border:rgba(0,0,0,0.08);--border-strong:rgba(0,0,0,0.15);--shadow-sm:0 1px 2px rgba(0,0,0,.06);--shadow-md:0 4px 12px rgba(0,0,0,.08);--shadow-lg:0 8px 32px rgba(0,0,0,.12);--shadow-glow:0 0 24px var(--accent-glow);--radius-sm:8px;--radius-md:12px;--radius-lg:16px;--radius-xl:20px;--radius-full:100px;--nav-height:64px;--safe-bottom:env(safe-area-inset-bottom,0px);--font:"Inter",-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}@media (prefers-color-scheme:dark){:root{--bg-primary:#0a0a0f;--bg-secondary:#12121a;--bg-tertiary:#1a1a28;--bg-card:#16162280;--bg-elevated:#1e1e2e;--bg-input:#14141f;--text-primary:#f0f0f8;--text-secondary:#9898b0;--text-tertiary:#6868800;--text-muted:#505068;--accent:#6c5ce7;--accent-light:#a29bfe;--accent-glow:rgba(108,92,231,0.2);--accent-dim:#4a3db8;--success:#00c9a7;--success-bg:rgba(0,201,167,0.12);--warning:#ffc107;--warning-bg:rgba(255,193,7,0.12);--danger:#ff6b6b;--danger-bg:rgba(255,107,107,0.12);--border:rgba(255,255,255,0.06);--border-strong:rgba(255,255,255,0.12);--shadow-sm:0 1px 2px rgba(0,0,0,.3);--shadow-md:0 4px 12px rgba(0,0,0,.4);--shadow-lg:0 8px 32px rgba(0,0,0,.5);--shadow-glow:0 0 24px var(--accent-glow)}}*{margin:0;padding:0;box-sizing:border-box;-webkit-tap-highlight-color:transparent}html{font-family:var(--font);font-size:16px;color:var(--text-primary);background:var(--bg-primary);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{min-height:100dvh;padding-bottom:calc(var(--nav-height) + var(--safe-bottom) + 16px);overflow-x:hidden}::-webkit-scrollbar{width:4px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:var(--border-strong);border-radius:4px}.page{max-width:480px;margin:0 auto;padding:20px 16px 16px}.page-title{font-size:1.5rem;font-weight:700;margin-bottom:20px;letter-spacing:-.02em}.card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);padding:20px;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);transition:border-color .2s}.card:hover{border-color:var(--border-strong)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 24px;border:none;border-radius:var(--radius-full);font-family:var(--font);font-size:.875rem;font-weight:600;cursor:pointer;transition:all .2s ease;min-height:48px;-webkit-user-select:none;-moz-user-select:none;user-select:none}.btn:active{transform:scale(.97)}.btn-primary{background:var(--accent);color:white;box-shadow:var(--shadow-glow)}.btn-primary:hover{background:var(--accent-light)}.btn-primary:disabled{opacity:.5;cursor:not-allowed;transform:none}.btn-secondary{background:var(--bg-tertiary);color:var(--text-primary);border:1px solid var(--border)}.btn-secondary:hover{border-color:var(--border-strong)}.btn-ghost{background:transparent;color:var(--text-secondary);padding:8px 16px;min-height:40px}.btn-ghost:hover{color:var(--text-primary);background:var(--bg-tertiary)}.btn-success{background:var(--success);color:var(--bg-primary)}.btn-warning{background:var(--warning);color:var(--bg-primary)}.btn-danger{background:var(--danger);color:white}.btn-sm{padding:8px 16px;font-size:.8125rem;min-height:36px}.btn-block{width:100%}.btn-icon{width:44px;height:44px;padding:0;border-radius:var(--radius-md);font-size:1.25rem}.input{width:100%;padding:14px 16px;background:var(--bg-input);border:1px solid var(--border);border-radius:var(--radius-md);color:var(--text-primary);font-family:var(--font);font-size:1rem;outline:none;transition:border-color .2s,box-shadow .2s}.input:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-glow)}.input::placeholder{color:var(--text-muted)}textarea.input{resize:vertical;min-height:100px;line-height:1.5}.select{-webkit-appearance:none;-moz-appearance:none;appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%239898b0' d='M6 8L1 3h10z'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 12px center;padding-right:36px}.pill{display:inline-flex;align-items:center;padding:4px 12px;border-radius:var(--radius-full);font-size:.75rem;font-weight:600;text-transform:uppercase;letter-spacing:.03em}.pill-fr{color:#74b9ff}.pill-en,.pill-fr{background:#2d3436}.pill-en{color:#fd79a8}.toast-container{position:fixed;top:16px;left:50%;transform:translateX(-50%);z-index:1000;display:flex;flex-direction:column;gap:8px;max-width:calc(100vw - 32px);width:400px}.toast{padding:12px 20px;border-radius:var(--radius-md);font-size:.875rem;font-weight:500;animation:toastIn .3s ease,toastOut .3s ease 2.7s forwards;-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);text-align:center}.toast-success{background:var(--success-bg);color:var(--success);border:1px solid rgba(0,201,167,.3)}.toast-warning{background:var(--warning-bg);color:var(--warning);border:1px solid rgba(255,193,7,.3)}.toast-error{background:var(--danger-bg);color:var(--danger);border:1px solid rgba(255,107,107,.3)}@keyframes toastIn{0%{opacity:0;transform:translateY(-12px)}to{opacity:1;transform:translateY(0)}}@keyframes toastOut{0%{opacity:1}to{opacity:0;transform:translateY(-12px)}}.bottom-nav{position:fixed;bottom:0;left:0;right:0;height:calc(var(--nav-height) + var(--safe-bottom));padding-bottom:calc(var(--safe-bottom) + 16px);background:rgba(245,245,250,.92);-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);border-top:1px solid var(--border);display:flex;align-items:center;justify-content:space-around;z-index:100}@media (prefers-color-scheme:dark){.bottom-nav{background:rgba(10,10,15,.92)}}.nav-item{display:flex;flex-direction:column;align-items:center;gap:4px;padding:6px 12px;color:var(--text-muted);text-decoration:none;font-size:.625rem;font-weight:600;letter-spacing:.02em;transition:color .2s;position:relative;min-width:56px}.nav-item.active,.nav-item:hover{color:var(--accent-light)}.nav-icon{font-size:1.375rem;line-height:1}.nav-badge{position:absolute;top:2px;right:4px;min-width:18px;height:18px;padding:0 5px;background:var(--danger);color:white;font-size:.625rem;font-weight:700;border-radius:10px;display:flex;align-items:center;justify-content:center}.stat-grid{display:grid;grid-template-columns:repeat(2,1fr);grid-gap:12px;gap:12px;margin-bottom:24px}.stat-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-md);padding:16px;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px)}.stat-value{font-size:1.75rem;font-weight:700;letter-spacing:-.02em;margin-bottom:2px}.stat-label{font-size:.75rem;color:var(--text-secondary);font-weight:500}.flashcard-container{perspective:1000px;margin:24px 0}.flashcard{background:linear-gradient(145deg,var(--bg-elevated),var(--bg-tertiary));border:1px solid var(--border-strong);border-radius:var(--radius-xl);padding:40px 24px;min-height:220px;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;cursor:pointer;transition:transform .3s ease,box-shadow .3s ease;position:relative;overflow:hidden}.flashcard:before{content:"";position:absolute;top:0;left:0;right:0;height:2px;background:linear-gradient(90deg,var(--accent),var(--accent-light));opacity:.6}.flashcard:active{transform:scale(.98)}.flashcard-label{font-size:.75rem;color:var(--text-muted);text-transform:uppercase;letter-spacing:.06em;margin-bottom:16px}.flashcard-text{font-size:1.5rem;font-weight:600;line-height:1.4;margin-bottom:8px}.flashcard-reveal{font-size:.8125rem;color:var(--accent-light);margin-top:16px}.flashcard-answer{animation:revealIn .3s ease}.flashcard-answer .flashcard-text{color:var(--accent-light)}@keyframes revealIn{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}.grade-buttons{display:grid;grid-template-columns:repeat(3,1fr);grid-gap:10px;gap:10px;margin-top:16px}.grade-btn{display:flex;flex-direction:column;align-items:center;gap:4px;padding:16px 8px;border:1px solid var(--border);border-radius:var(--radius-md);background:var(--bg-card);color:var(--text-primary);font-family:var(--font);cursor:pointer;transition:all .2s;min-height:72px}.grade-btn:active{transform:scale(.95)}.grade-btn-icon{font-size:1.25rem}.grade-btn-label{font-size:.6875rem;font-weight:600}.grade-btn.knew{border-color:rgba(0,201,167,.3)}.grade-btn.knew:hover{background:var(--success-bg);border-color:var(--success)}.grade-btn.unsure{border-color:rgba(255,193,7,.3)}.grade-btn.unsure:hover{background:var(--warning-bg);border-color:var(--warning)}.grade-btn.forgot{border-color:rgba(255,107,107,.3)}.grade-btn.forgot:hover{background:var(--danger-bg);border-color:var(--danger)}.session-progress{display:flex;align-items:center;gap:12px;margin-bottom:20px}.progress-bar{flex:1 1;height:4px;background:var(--bg-tertiary);border-radius:2px;overflow:hidden}.progress-fill{height:100%;background:linear-gradient(90deg,var(--accent),var(--accent-light));border-radius:2px;transition:width .3s ease}.progress-text{font-size:.8125rem;color:var(--text-secondary);font-weight:500;white-space:nowrap}.item-list{display:flex;flex-direction:column;gap:8px}.item-card{display:flex;align-items:center;gap:12px;padding:14px 16px;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-md);cursor:pointer;transition:border-color .2s,background .2s;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px)}.item-card:hover{border-color:var(--border-strong);background:var(--bg-tertiary)}.item-card:active{transform:scale(.99)}.item-content{flex:1 1;min-width:0}.item-source{font-weight:600;font-size:.9375rem;margin-bottom:2px}.item-source,.item-target{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.item-target{color:var(--text-secondary);font-size:.8125rem}.item-meta{display:flex;flex-direction:column;align-items:flex-end;gap:4px;flex-shrink:0}.item-delete{background:none;border:none;color:var(--text-muted);cursor:pointer;padding:4px;font-size:1rem;transition:color .2s}.item-delete:hover{color:var(--danger)}.search-bar{margin-bottom:16px}.filter-row{display:flex;gap:8px;margin-top:10px;overflow-x:auto;padding-bottom:4px}.filter-chip{padding:8px 14px;border-radius:var(--radius-full);border:1px solid var(--border);background:var(--bg-card);color:var(--text-secondary);font-family:var(--font);font-size:.8125rem;font-weight:500;cursor:pointer;white-space:nowrap;transition:all .2s}.filter-chip.active,.filter-chip:hover{border-color:var(--accent);color:var(--accent-light);background:var(--accent-glow)}.translate-box{position:relative}.lang-selector{display:flex;align-items:center;justify-content:center;gap:12px;margin-bottom:16px}.lang-label{font-size:.9375rem;font-weight:600;min-width:80px;text-align:center;padding:8px 16px;background:var(--bg-tertiary);border-radius:var(--radius-full);border:1px solid var(--border)}.swap-btn{width:40px;height:40px;border-radius:50%;border:1px solid var(--border);background:var(--bg-card);color:var(--text-secondary);font-size:1.125rem;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all .2s}.swap-btn:hover{border-color:var(--accent);color:var(--accent-light)}.swap-btn:active{transform:rotate(180deg)}.result-box{background:var(--bg-tertiary);border:1px solid var(--border);border-radius:var(--radius-md);padding:16px;min-height:100px;margin-top:16px;position:relative}.result-text{font-size:1.125rem;line-height:1.5;color:var(--text-primary)}.result-placeholder{color:var(--text-muted);font-style:italic}.result-actions{display:flex;gap:8px;margin-top:12px}.spinner{width:20px;height:20px;border:2px solid var(--border-strong);border-top-color:var(--accent);border-radius:50%;animation:spin .7s linear infinite}@keyframes spin{to{transform:rotate(1turn)}}.skeleton{background:linear-gradient(90deg,var(--bg-tertiary) 25%,var(--bg-elevated) 37%,var(--bg-tertiary) 63%);background-size:400% 100%;animation:skeleton-loading 1.4s ease infinite;border-radius:var(--radius-sm)}@keyframes skeleton-loading{0%{background-position:100% 50%}to{background-position:0 50%}}.empty-state{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:48px 24px;text-align:center}.empty-icon{font-size:3rem;margin-bottom:16px;opacity:.4}.empty-title{font-size:1.125rem;font-weight:600;margin-bottom:8px}.empty-desc{font-size:.875rem;color:var(--text-secondary);max-width:280px}.session-summary{text-align:center;padding:32px 16px}.summary-emoji{font-size:3.5rem;margin-bottom:16px}.summary-title{font-size:1.375rem;font-weight:700;margin-bottom:8px}.summary-subtitle{color:var(--text-secondary);font-size:.9375rem;margin-bottom:24px}.summary-stats{display:grid;grid-template-columns:repeat(3,1fr);grid-gap:12px;gap:12px;margin-bottom:24px}.summary-stat{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-md);padding:16px 8px}.summary-stat-value{font-size:1.5rem;font-weight:700}.summary-stat-label{font-size:.6875rem;color:var(--text-secondary);margin-top:4px}.timeline-chart{display:flex;align-items:flex-end;gap:3px;height:60px;padding:8px 0}.timeline-bar{flex:1 1;min-width:6px;background:var(--accent);border-radius:3px 3px 0 0;opacity:.7;transition:opacity .2s}.timeline-bar:hover{opacity:1}.modal-overlay{position:fixed;inset:0;background:rgba(0,0,0,.4);-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);z-index:200;display:flex;align-items:flex-end;justify-content:center;animation:fadeIn .2s ease}@media (prefers-color-scheme:dark){.modal-overlay{background:rgba(0,0,0,.7)}}.modal{background:var(--bg-secondary);border-radius:var(--radius-xl) var(--radius-xl) 0 0;width:100%;max-width:480px;max-height:85dvh;overflow-y:auto;padding:24px;animation:slideUp .3s ease}.modal-handle{width:36px;height:4px;background:var(--border-strong);border-radius:2px;margin:0 auto 20px}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes slideUp{0%{transform:translateY(100%)}to{transform:translateY(0)}}.session-picker{display:flex;flex-direction:column;align-items:center;gap:24px;padding:40px 16px}.session-options{display:grid;grid-template-columns:repeat(4,1fr);grid-gap:10px;gap:10px;width:100%}.session-option{display:flex;flex-direction:column;align-items:center;gap:4px;padding:20px 8px;border:1px solid var(--border);border-radius:var(--radius-md);background:var(--bg-card);color:var(--text-primary);font-family:var(--font);cursor:pointer;transition:all .2s}.session-option.selected,.session-option:hover{border-color:var(--accent);background:var(--accent-glow)}.session-option-number{font-size:1.5rem;font-weight:700}.session-option-label{font-size:.6875rem;color:var(--text-secondary)}.setting-row{display:flex;align-items:center;justify-content:space-between;padding:16px 0;border-bottom:1px solid var(--border)}.setting-row:last-child{border-bottom:none}.setting-info{flex:1 1}.setting-label{font-size:.9375rem;font-weight:600}.setting-desc{font-size:.8125rem;color:var(--text-secondary);margin-top:2px}.setting-control{flex-shrink:0}.setting-control .input{width:80px;text-align:center}.flex{display:flex}.flex-col{flex-direction:column}.items-center{align-items:center}.justify-center{justify-content:center}.justify-between{justify-content:space-between}.gap-sm{gap:8px}.gap-md{gap:12px}.gap-lg{gap:16px}.mt-sm{margin-top:8px}.mt-md{margin-top:16px}.mt-lg{margin-top:24px}.mb-md{margin-bottom:16px}.text-center{text-align:center}.text-sm{font-size:.8125rem}.text-muted{color:var(--text-secondary)}.w-full{width:100%}.hidden{display:none}