:root{--text: #6b6375;--text-h: #08060d;--bg: #fff;--border: #e5e4e7;--code-bg: #f4f3ec;--accent: #aa3bff;--accent-bg: rgba(170, 59, 255, .1);--accent-border: rgba(170, 59, 255, .5);--social-bg: rgba(244, 243, 236, .5);--shadow: rgba(0, 0, 0, .1) 0 10px 15px -3px, rgba(0, 0, 0, .05) 0 4px 6px -2px;--sans: system-ui, "Segoe UI", Roboto, sans-serif;--heading: system-ui, "Segoe UI", Roboto, sans-serif;--mono: ui-monospace, Consolas, monospace;font:18px/145% var(--sans);letter-spacing:.18px;color-scheme:light dark;color:var(--text);background:var(--bg);font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}@media(max-width:1024px){:root{font-size:16px}}@media(prefers-color-scheme:dark){:root{--text: #9ca3af;--text-h: #f3f4f6;--bg: #16171d;--border: #2e303a;--code-bg: #1f2028;--accent: #c084fc;--accent-bg: rgba(192, 132, 252, .15);--accent-border: rgba(192, 132, 252, .5);--social-bg: rgba(47, 48, 58, .5);--shadow: rgba(0, 0, 0, .4) 0 10px 15px -3px, rgba(0, 0, 0, .25) 0 4px 6px -2px}#social .button-icon{filter:invert(1) brightness(2)}}#root{width:100%;min-height:100vh;display:flex;flex-direction:column;box-sizing:border-box}body{margin:0}h1,h2{font-family:var(--heading);font-weight:500;color:var(--text-h)}h1{font-size:56px;letter-spacing:-1.68px;margin:32px 0}@media(max-width:1024px){h1{font-size:36px;margin:20px 0}}h2{font-size:24px;line-height:118%;letter-spacing:-.24px;margin:0 0 8px}@media(max-width:1024px){h2{font-size:20px}}p{margin:0}code,.counter{font-family:var(--mono);display:inline-flex;border-radius:4px;color:var(--text-h)}code{font-size:15px;line-height:135%;padding:4px 8px;background:var(--code-bg)}.app-shell{min-height:100vh;display:flex;flex-direction:column;background-color:var(--bg);color:var(--text);font-family:var(--sans)}.main-content,.main-container{flex:1;max-width:1200px;width:100%;margin:0 auto;padding:1.5rem;box-sizing:border-box;display:flex;flex-direction:column}.global-loader-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#00000080;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);display:flex;flex-direction:column;align-items:center;justify-content:center;z-index:9999;color:#fff;gap:1rem}.spinner{width:40px;height:40px;border:3px solid rgba(255,255,255,.2);border-top-color:var(--accent);border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.navbar{position:sticky;top:0;z-index:1000;background:var(--bg);border-bottom:1px solid var(--border);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px)}.nav-container{max-width:1200px;margin:0 auto;padding:.75rem 1.5rem;display:flex;align-items:center;justify-content:space-between;gap:1.5rem}.nav-brand{position:relative;display:flex;align-items:center}.nav-burger-btn{width:38px;height:38px;background:linear-gradient(135deg,#aa3bff,#6366f1);border:none;border-radius:10px;display:flex;align-items:center;justify-content:center;color:#fff;cursor:pointer;transition:all .2s cubic-bezier(.4,0,.2,1);box-shadow:0 2px 8px #aa3bff40;padding:0}.nav-burger-btn:hover{transform:translateY(-1px);box-shadow:0 4px 14px #aa3bff66}.nav-burger-btn:active,.nav-burger-btn.active{transform:scale(.95);box-shadow:0 0 0 2px var(--accent)}.nav-dropdown-menu{position:absolute;top:calc(100% + 8px);left:0;min-width:190px;background:var(--bg);border:1px solid var(--border);border-radius:12px;padding:.35rem;box-shadow:0 10px 25px -5px #0003,0 8px 10px -6px #0000001a;z-index:1000;display:flex;flex-direction:column;gap:.25rem;animation:dropdownFade .15s ease-out}.nav-dropdown-item{display:flex;align-items:center;justify-content:space-between;width:100%;padding:.6rem .8rem;background:transparent;border:none;border-radius:8px;color:var(--text-h);font-size:.9rem;font-family:inherit;font-weight:500;cursor:pointer;transition:all .15s ease;text-align:left}.nav-dropdown-item:hover{background:var(--code-bg);color:var(--accent)}.nav-dropdown-item.active{background:var(--accent-bg);color:var(--accent);font-weight:600}.nav-dropdown-item-left{display:flex;align-items:center;gap:.65rem}.brand-logo-icon{width:36px;height:36px;background:linear-gradient(135deg,#aa3bff,#6366f1);border-radius:10px;display:flex;align-items:center;justify-content:center;color:#fff}.brand-name{font-size:1.4rem;font-weight:700;letter-spacing:-.5px;color:var(--text-h)}.nav-links{display:flex;align-items:center;gap:.5rem}.nav-link-btn{display:inline-flex;align-items:center;gap:.4rem;padding:.5rem .9rem;border-radius:8px;border:none;background:transparent;color:var(--text);font-weight:500;font-size:.9rem;cursor:pointer;transition:all .2s ease}.nav-link-btn:hover{background:var(--accent-bg);color:var(--accent)}.nav-link-btn.active{background:var(--accent-bg);color:var(--accent);font-weight:600}.nav-btn-create,.btn-create-prompt{display:inline-flex;align-items:center;gap:.4rem;padding:.5rem 1rem;background:linear-gradient(135deg,#aa3bff,#7c3aed);color:#fff;border:none;border-radius:8px;font-family:inherit;font-weight:600;font-size:.9rem;cursor:pointer;transition:transform .15s ease,box-shadow .15s ease}.nav-btn-create:hover,.btn-create-prompt:hover{transform:translateY(-1px);box-shadow:0 4px 12px #aa3bff59}.nav-auth{display:flex;align-items:center}.user-profile{display:flex;align-items:center;gap:.6rem}.user-avatar,.user-avatar-fallback{width:32px;height:32px;border-radius:50%;object-fit:cover;border:1px solid var(--border)}.user-avatar-fallback{background:var(--code-bg);display:flex;align-items:center;justify-content:center;color:var(--text)}.user-name{font-size:.9rem;font-weight:500;color:var(--text-h);max-width:140px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.btn-logout{background:transparent;border:none;color:var(--text);cursor:pointer;padding:.3rem;border-radius:6px}.btn-logout:hover{color:#ef4444}.btn-login{display:inline-flex;align-items:center;gap:.4rem;padding:.5rem 1rem;border-radius:8px;border:1px solid var(--border);background:var(--code-bg);color:var(--text-h);font-weight:500;font-size:.9rem;cursor:pointer}.modal-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;background:#000000a6;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);display:flex;align-items:center;justify-content:center;z-index:2000;padding:1rem}.auth-modal,.import-modal{background:var(--bg);border:1px solid var(--border);border-radius:16px;width:100%;max-width:440px;padding:2rem;box-shadow:var(--shadow);position:relative;box-sizing:border-box}.import-modal{max-width:580px}.modal-close-btn{position:absolute;top:1rem;right:1rem;background:transparent;border:none;color:var(--text);cursor:pointer;padding:.3rem;border-radius:50%}.auth-header h2{margin:0 0 .4rem;font-size:1.5rem}.auth-header p{color:var(--text);font-size:.9rem;margin:0 0 1.5rem}.auth-error-box{display:flex;align-items:center;gap:.5rem;background:#ef44441a;border:1px solid rgba(239,68,68,.4);color:#ef4444;padding:.6rem .8rem;border-radius:8px;font-size:.85rem;margin-bottom:1.25rem}.dev-bypass-section{width:100%}.btn-dev-bypass{width:100%;display:flex;align-items:center;justify-content:center;gap:.65rem;padding:.75rem;background:#6366f11f;color:#818cf8;border:1px dashed rgba(99,102,241,.5);border-radius:8px;font-size:.95rem;font-weight:600;cursor:pointer;transition:all .2s ease}.btn-dev-bypass:hover{background:#6366f138;border-color:#818cf8;color:#a5b4fc}.btn-google{width:100%;display:flex;align-items:center;justify-content:center;gap:.75rem;padding:.75rem;background:#fff;color:#3c4043;border:1px solid #dadce0;border-radius:8px;font-size:.95rem;font-weight:500;cursor:pointer;box-shadow:0 1px 3px #00000014}.auth-divider{display:flex;align-items:center;margin:1.5rem 0;color:var(--text);font-size:.8rem;text-transform:uppercase}.auth-divider:before,.auth-divider:after{content:"";flex:1;height:1px;background:var(--border)}.auth-divider span{padding:0 .75rem}.auth-form .input-group{margin-bottom:1rem}.auth-form label{display:block;font-size:.85rem;font-weight:500;margin-bottom:.35rem}.input-field-wrapper{position:relative;display:flex;align-items:center}.field-icon{position:absolute;left:.75rem;color:var(--text)}.input-field-wrapper input{width:100%;padding:.65rem .75rem .65rem 2.4rem;border-radius:8px;border:1px solid var(--border);background:var(--code-bg);color:var(--text-h);font-size:.95rem}.btn-primary-auth{width:100%;padding:.75rem;border-radius:8px;border:none;background:var(--accent);color:#fff;font-weight:600;font-size:.95rem;cursor:pointer;margin-top:.5rem}.auth-footer{text-align:center;font-size:.9rem;margin-top:1.5rem}.auth-footer button{background:transparent;border:none;color:var(--accent);font-weight:600;cursor:pointer}.import-modal-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:1rem}.import-modal-header .header-title{display:flex;align-items:center;gap:.5rem}.import-instructions{font-size:.9rem;color:var(--text);margin-bottom:1rem}.separator-controls{display:grid;grid-template-columns:1fr 1fr;gap:1rem;margin-bottom:1rem}.separator-group label{display:block;font-size:.8rem;margin-bottom:.3rem}.separator-group select{width:100%;padding:.5rem;border-radius:6px;border:1px solid var(--border);background:var(--code-bg);color:var(--text-h)}.import-textarea{width:100%;box-sizing:border-box;padding:.75rem;border-radius:8px;border:1px solid var(--border);background:var(--code-bg);color:var(--text-h);font-family:var(--mono);font-size:.9rem}.import-preview-bar{display:flex;align-items:center;justify-content:space-between;margin:.75rem 0 1.25rem;font-size:.85rem}.count-badge{color:var(--accent);font-weight:600}.import-modal-actions{display:flex;justify-content:flex-end;gap:.75rem}.deck-list-container{padding:1rem 0}.deck-list-header{display:flex;align-items:center;justify-content:space-between;gap:1rem;margin-bottom:2rem;flex-wrap:wrap}.tabs-wrapper{display:flex;background:var(--code-bg);padding:.25rem;border-radius:10px;border:1px solid var(--border)}.tab-btn{padding:.5rem 1.1rem;border-radius:8px;border:none;background:transparent;color:var(--text);font-size:.9rem;font-weight:500;cursor:pointer}.tab-btn.active{background:var(--bg);color:var(--text-h);font-weight:600;box-shadow:var(--shadow)}.search-bar{position:relative;display:flex;align-items:center;min-width:280px}.search-icon{position:absolute;left:.85rem;color:var(--text)}.search-bar input{width:100%;padding:.55rem .85rem .55rem 2.4rem;border-radius:10px;border:1px solid var(--border);background:var(--code-bg);color:var(--text-h);font-size:.9rem}.error-banner{background:#ef44441a;border:1px solid rgba(239,68,68,.3);color:#ef4444;padding:.75rem 1rem;border-radius:8px;margin-bottom:1.5rem;font-size:.9rem}.loading-spinner-wrapper{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:4rem 1rem;gap:1rem;color:var(--text)}.empty-decks-card{max-width:480px;margin:3rem auto;padding:3rem 2rem;text-align:center;background:var(--bg);border:1px solid var(--border);border-radius:20px;box-shadow:var(--shadow);display:flex;flex-direction:column;align-items:center}.empty-decks-card .empty-icon{color:var(--accent);margin-bottom:1rem;opacity:.85}.empty-decks-card h3{margin:0 0 .5rem;font-size:1.35rem;font-weight:600;color:var(--text-h)}.empty-decks-card p{color:var(--text);font-size:.95rem;margin-bottom:1.5rem;line-height:1.5}.decks-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:1.5rem}.deck-card{background:var(--bg);border:1px solid var(--border);border-radius:14px;padding:1.5rem;box-shadow:var(--shadow);cursor:pointer;transition:transform .2s ease,border-color .2s ease;display:flex;flex-direction:column}.deck-card:hover{transform:translateY(-2px);border-color:var(--accent)}.deck-card-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:.75rem}.card-count-pill{display:inline-flex;align-items:center;gap:.35rem;background:var(--accent-bg);color:var(--accent);padding:.25rem .6rem;border-radius:9999px;font-size:.8rem;font-weight:600}.deck-title{margin:0 0 .5rem;font-size:1.25rem;font-weight:600;color:var(--text-h)}.deck-desc{margin:0 0 1.25rem;color:var(--text);font-size:.9rem;line-height:1.4;flex:1;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.deck-card-bottom{display:flex;align-items:center;justify-content:space-between;margin-top:auto;padding-top:1rem;border-top:1px solid var(--border)}.deck-creator-info{display:flex;align-items:center;gap:.5rem}.creator-avatar,.creator-avatar-fallback{width:24px;height:24px;border-radius:50%;font-size:.75rem}.creator-avatar-fallback{background:var(--code-bg);display:flex;align-items:center;justify-content:center;color:var(--accent);font-weight:600}.creator-name{font-size:.85rem;color:var(--text)}.deck-actions{display:flex;align-items:center;gap:.5rem}.btn-icon-action{background:transparent;border:none;color:var(--text);padding:.35rem;border-radius:6px;cursor:pointer}.btn-icon-action:hover{color:var(--accent)}.btn-icon-action.delete:hover{color:#ef4444}.btn-study-pill{display:inline-flex;align-items:center;gap:.35rem;padding:.4rem .8rem;background:var(--accent);color:#fff;border:none;border-radius:8px;font-size:.85rem;font-weight:600;cursor:pointer}.set-creator-view{padding:1rem 0 3rem}.creator-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:1.5rem;gap:1rem}.btn-back{display:inline-flex;align-items:center;gap:.4rem;background:transparent;border:none;color:var(--text);font-weight:500;cursor:pointer}.creator-header h2{margin:0;font-size:1.5rem}.creator-header-actions{display:flex;align-items:center;gap:.75rem}.btn-import-trigger{display:inline-flex;align-items:center;gap:.4rem;padding:.5rem .9rem;background:var(--code-bg);border:1px solid var(--border);color:var(--text-h);border-radius:8px;font-size:.9rem;font-weight:500;cursor:pointer}.btn-primary-save{display:inline-flex;align-items:center;gap:.4rem;padding:.55rem 1.25rem;background:var(--accent);color:#fff;border:none;border-radius:8px;font-weight:600;cursor:pointer}.set-meta-card{background:var(--bg);border:1px solid var(--border);border-radius:12px;padding:1.5rem;margin-bottom:2rem;box-shadow:var(--shadow)}.meta-field{margin-bottom:1rem}.meta-field label{display:block;font-size:.85rem;font-weight:600;margin-bottom:.35rem;text-transform:uppercase;color:var(--text)}.input-title,.input-desc{width:100%;box-sizing:border-box;padding:.75rem;border-radius:8px;border:1px solid var(--border);background:var(--code-bg);color:var(--text-h);font-size:1rem}.visibility-toggle{display:inline-flex;align-items:center;gap:.5rem;cursor:pointer}.toggle-label{display:inline-flex;align-items:center;gap:.4rem;font-size:.9rem;font-weight:500}.cards-editor-section{margin-top:2rem}.cards-section-header h3{margin:0 0 1rem;font-size:1.25rem}.card-editor-row{display:flex;align-items:flex-start;gap:1rem;background:var(--bg);border:1px solid var(--border);border-radius:12px;padding:1.25rem;margin-bottom:1rem;box-shadow:var(--shadow)}.card-row-index{font-size:1.1rem;font-weight:700;color:var(--accent);min-width:24px;padding-top:.3rem}.card-inputs-grid{flex:1;display:grid;grid-template-columns:1fr 1fr 180px;gap:1rem}.card-input-cell{display:flex;flex-direction:column}.cell-label{font-size:.75rem;font-weight:600;color:var(--text);margin-bottom:.35rem;display:flex;align-items:center;gap:.25rem}.card-input-cell textarea,.card-input-cell input{width:100%;box-sizing:border-box;padding:.6rem .75rem;border-radius:8px;border:1px solid var(--border);background:var(--code-bg);color:var(--text-h);font-size:.95rem;font-family:inherit;resize:vertical}.card-input-cell textarea,.light-editor-textarea{min-height:200px;line-height:1.45;width:100%;box-sizing:border-box;padding:.6rem .75rem;border-radius:8px;border:1px solid var(--border);background:var(--code-bg);color:var(--text-h);font-size:.95rem;font-family:inherit;resize:vertical}.light-editor-container{display:flex;flex-direction:column;gap:.25rem;width:100%}.light-editor-header{display:flex;align-items:center;justify-content:space-between;gap:.5rem}.light-editor-toolbar{display:flex;align-items:center;gap:.25rem}.light-editor-btn{display:inline-flex;align-items:center;justify-content:center;width:22px;height:22px;padding:0;border-radius:4px;border:1px solid var(--border);background:var(--bg);color:var(--text);cursor:pointer;transition:all .15s ease}.light-editor-btn:hover{background:var(--accent-bg);color:var(--accent);border-color:var(--accent)}.card-row-actions{display:flex;flex-direction:column;gap:.4rem;margin-top:1.5rem}.btn-preview-card-row{background:transparent;border:none;color:var(--text);cursor:pointer;padding:.4rem;border-radius:6px;display:flex;align-items:center;justify-content:center;transition:all .15s ease}.btn-preview-card-row:hover{color:var(--accent);background:var(--accent-bg)}.btn-delete-card{background:transparent;border:none;color:var(--text);cursor:pointer;padding:.4rem;border-radius:6px;display:flex;align-items:center;justify-content:center;transition:all .15s ease}.btn-delete-card:hover{color:#ef4444}.btn-preview-trigger{display:inline-flex;align-items:center;gap:.4rem;padding:.6rem 1rem;border-radius:8px;border:1px solid var(--border);background:var(--bg);color:var(--text-h);font-weight:600;font-size:.9rem;cursor:pointer;transition:all .2s ease}.btn-preview-trigger:hover{border-color:var(--accent);color:var(--accent);background:var(--accent-bg)}.card-preview-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;z-index:1000;background:#000000b3;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);display:flex;align-items:center;justify-content:center;padding:1.5rem;box-sizing:border-box}.card-preview-modal{background:var(--bg);border:1px solid var(--border);border-radius:20px;width:100%;max-width:640px;box-shadow:0 20px 50px #00000080;display:flex;flex-direction:column;overflow:hidden}.card-preview-header{display:flex;align-items:center;justify-content:space-between;padding:1.25rem 1.5rem;border-bottom:1px solid var(--border)}.preview-header-left{display:flex;align-items:baseline;gap:.75rem}.preview-header-left h3{margin:0;font-size:1.15rem;font-weight:700;color:var(--text-h)}.preview-counter{font-size:.85rem;color:var(--text)}.btn-preview-close{display:flex;align-items:center;justify-content:center;background:transparent;border:none;color:var(--text);cursor:pointer;padding:.35rem;border-radius:6px;transition:all .15s ease}.btn-preview-close:hover{color:var(--text-h);background:var(--code-bg)}.card-preview-body{padding:2rem;display:flex;justify-content:center;background:var(--code-bg)}.preview-card-scene{width:100%;min-height:320px;height:340px;perspective:1000px;cursor:pointer;margin:0!important}.preview-card-scene .card-face{padding:1.5rem 1.75rem}.preview-card-scene .card-text{font-size:1.5rem}.card-preview-footer{display:flex;align-items:center;justify-content:space-between;padding:1rem 1.5rem;border-top:1px solid var(--border);background:var(--bg)}.btn-preview-nav{display:inline-flex;align-items:center;gap:.35rem;padding:.55rem .95rem;border-radius:8px;border:1px solid var(--border);background:var(--code-bg);color:var(--text-h);font-weight:500;font-size:.85rem;cursor:pointer;transition:all .15s ease}.btn-preview-nav:hover:not(:disabled){border-color:var(--accent);color:var(--accent)}.btn-preview-nav:disabled{opacity:.4;cursor:not-allowed}.btn-preview-flip{display:inline-flex;align-items:center;gap:.45rem;padding:.55rem 1.2rem;border-radius:9999px;border:1px solid var(--accent);background:var(--accent-bg);color:var(--accent);font-weight:600;font-size:.85rem;cursor:pointer;transition:all .2s ease}.btn-preview-flip:hover{background:var(--accent);color:#fff}.add-card-wrapper{margin-top:1.5rem;text-align:center}.btn-add-card{display:inline-flex;align-items:center;gap:.5rem;padding:.75rem 1.75rem;border-radius:10px;border:2px dashed var(--accent-border);background:var(--accent-bg);color:var(--accent);font-weight:600;cursor:pointer;transition:all .2s ease}.btn-add-card:hover{background:var(--accent);color:#fff;border-style:solid}.study-container-view{flex:1;display:flex;flex-direction:column;justify-content:flex-start;align-items:stretch;width:100%;box-sizing:border-box}.active-mode-stage{flex:1;display:flex;flex-direction:column;justify-content:center;align-items:center;width:100%;min-height:0}.study-top-nav{display:flex;flex-direction:row;align-items:center;justify-content:space-between;align-self:flex-start;margin-right:auto;width:100%;max-height:80px;gap:1.5rem;margin-bottom:2rem;box-sizing:border-box}.study-header-part{display:flex;gap:2rem}.btn-back-link{display:inline-flex;align-items:center;gap:.4rem;background:transparent;border:none;color:var(--text);font-size:.9rem;cursor:pointer;margin-bottom:0}.study-set-headline{max-width:280px;min-width:0}.study-set-headline h2{margin:0 0 .25rem;font-size:1.75rem;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.study-set-desc{margin:0;color:var(--text);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.study-mode-tabs{display:inline-flex;gap:.5rem;background:var(--code-bg);padding:.35rem;border-radius:12px;border:1px solid var(--border)}.mode-tab-btn{display:inline-flex;align-items:center;gap:.5rem;padding:.6rem 1.25rem;border-radius:9px;border:none;background:transparent;color:var(--text);font-weight:600;font-size:.95rem;cursor:pointer}.mode-tab-btn.active{background:var(--accent);color:#fff;box-shadow:0 2px 8px #aa3bff4d}.flashcards-mode-view{width:100%;max-width:720px;margin:0 auto}.flashcard-toolbar{display:flex;align-items:center;justify-content:space-between;margin-bottom:.75rem}.card-counter{font-size:.95rem;color:var(--text)}.toolbar-right{position:relative;display:flex;gap:.4rem}.btn-toolbar{background:var(--code-bg);border:1px solid var(--border);color:var(--text-h);padding:.4rem;border-radius:8px;cursor:pointer;transition:all .2s ease;display:inline-flex;align-items:center;justify-content:center}.btn-toolbar:hover{border-color:var(--accent);color:var(--accent)}.btn-toolbar.active{background:var(--accent-bg);border-color:var(--accent);color:var(--accent)}.toolbar-dropdown-menu{position:absolute;top:calc(100% + 8px);right:0;min-width:230px;background:var(--bg);border:1px solid var(--border);border-radius:12px;padding:.35rem;box-shadow:0 10px 25px -5px #00000026,0 8px 10px -6px #0000001a;z-index:100;display:flex;flex-direction:column;gap:.25rem;animation:dropdownFade .15s ease-out}@keyframes dropdownFade{0%{opacity:0;transform:translateY(-4px) scale(.97)}to{opacity:1;transform:translateY(0) scale(1)}}.toolbar-dropdown-item{display:flex;align-items:center;justify-content:space-between;width:100%;padding:.55rem .75rem;background:transparent;border:none;border-radius:8px;color:var(--text-h);font-size:.88rem;font-family:inherit;font-weight:500;cursor:pointer;transition:all .15s ease;text-align:left}.toolbar-dropdown-item:hover{background:var(--code-bg);color:var(--accent)}.toolbar-dropdown-item.active{color:var(--accent);background:var(--accent-bg)}.dropdown-item-left{display:flex;align-items:center;gap:.6rem}.dropdown-item-badge{font-size:.75rem;padding:.15rem .45rem;background:var(--code-bg);color:var(--accent);border:1px solid var(--border);border-radius:6px;font-weight:600}.dropdown-item-kbd{font-size:.75rem;padding:.15rem .45rem;background:var(--code-bg);color:var(--text);border:1px solid var(--border);border-radius:4px;font-family:var(--mono);box-shadow:0 1px 1px #00000014}.flashcard-progress-track{width:100%;height:6px;background:var(--code-bg);border-radius:3px;overflow:hidden;margin-bottom:1.5rem}.flashcard-progress-bar{height:100%;background:var(--accent);transition:width .3s ease}.card-scene{perspective:1000px;height:420px;cursor:pointer;margin-bottom:1.5rem}.flip-card{width:100%;height:100%;position:relative;transform-style:preserve-3d;transition:transform .5s cubic-bezier(.4,0,.2,1);border-radius:20px}.flip-card.flipped{transform:rotateY(180deg)}.card-face{position:absolute;top:0;right:0;bottom:0;left:0;backface-visibility:hidden;border-radius:20px;border:1px solid var(--border);background:var(--bg);box-shadow:var(--shadow);display:flex;flex-direction:column;justify-content:space-between;align-items:center;padding:2rem;box-sizing:border-box;overflow:hidden}@media(max-width:768px){.card-face.card-front,.card-front,.card-face.card-back,.card-back{padding:1rem}.card-text{font-size:1.35rem}.hint-chip{font-size:.8rem;padding:.35rem .75rem;margin-top:.5rem;max-height:80px}}@media(max-width:480px){.card-face.card-front,.card-front,.card-face.card-back,.card-back{padding:.875rem .75rem}.card-text{font-size:1.15rem}.hint-chip{font-size:.75rem;padding:.3rem .65rem;max-height:70px}}.card-back{transform:rotateY(180deg);background:var(--code-bg)}.face-tag{font-size:.8rem;font-weight:700;letter-spacing:1.5px;color:var(--accent)}.face-content{flex:1;min-height:0;width:100%;display:flex;flex-direction:column;align-items:center;overflow-y:auto;overflow-x:hidden;box-sizing:border-box;padding:.25rem .5rem;scrollbar-width:thin;scrollbar-color:var(--border) transparent}.face-content::-webkit-scrollbar{width:5px}.face-content::-webkit-scrollbar-track{background:transparent}.face-content::-webkit-scrollbar-thumb{background-color:var(--border);border-radius:9999px}.card-text{margin:auto 0;font-size:1.8rem;font-weight:600;line-height:1.4;color:var(--text-h);white-space:pre-wrap;word-break:break-word;overflow-wrap:anywhere;max-width:100%;width:100%}.card-text strong{font-weight:700;color:var(--text-h)}.card-text em{font-style:italic;color:inherit}.formatted-card-text{white-space:pre-wrap;word-break:break-word;overflow-wrap:anywhere}.formatted-card-text strong{font-weight:700}.formatted-card-text em{font-style:italic}.hint-chip{display:inline-flex;align-items:center;gap:.35rem;margin-top:.75rem;margin-bottom:.25rem;padding:.4rem .85rem;border-radius:9999px;background:var(--accent-bg);color:var(--accent);font-size:.85rem;cursor:pointer;flex-shrink:0;max-width:100%;box-sizing:border-box;word-break:break-word;max-height:90px;overflow-y:auto;scrollbar-width:thin;-webkit-user-select:none;user-select:none;z-index:2}.hint-chip span{white-space:normal;word-break:break-word}.flip-instruction{font-size:.8rem;color:var(--text);text-align:center}.flashcard-navigation-bar{display:flex;align-items:center;justify-content:center;gap:1.5rem;margin-bottom:1.5rem}.btn-nav-arrow{width:50px;height:50px;border-radius:50%;border:1px solid var(--border);background:var(--bg);color:var(--text-h);display:flex;align-items:center;justify-content:center;cursor:pointer;box-shadow:var(--shadow)}.btn-nav-arrow:disabled{opacity:.4;cursor:not-allowed}.btn-flip-action{padding:.75rem 1.25rem;border-radius:12px;border:1.5px solid var(--border);background:var(--code-bg);color:var(--text-h);font-size:1rem;font-weight:500;font-family:inherit;cursor:text;text-align:center;min-width:260px;max-width:380px;width:100%;box-sizing:border-box;outline:none;transition:border-color .2s ease,box-shadow .2s ease}.btn-flip-action:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-bg)}.btn-flip-action::placeholder{color:var(--text);opacity:.6}.btn-flip-action.error{border-color:#ef4444;box-shadow:0 0 0 3px #ef444433;animation:input-shake .4s ease}.btn-flip-action.correct{border-color:#10b981;box-shadow:0 0 0 3px #10b98133}@keyframes input-shake{0%,to{transform:translate(0)}20%,60%{transform:translate(-6px)}40%,80%{transform:translate(6px)}}.keyboard-hints-wrapper{position:fixed;bottom:1.5rem;right:1.5rem;z-index:100;display:flex;flex-direction:column;align-items:flex-end}.keyboard-hints-btn{display:flex;align-items:center;justify-content:center;width:36px;height:36px;border-radius:50%;border:1px solid var(--border);background:var(--bg);color:var(--text);cursor:pointer;box-shadow:var(--shadow);transition:all .2s ease;padding:0}.keyboard-hints-btn:hover,.keyboard-hints-wrapper:hover .keyboard-hints-btn{color:var(--accent);border-color:var(--accent-border);background:var(--code-bg);transform:scale(1.05)}.keyboard-hints-popover{opacity:0;visibility:hidden;transform:translateY(8px) scale(.96);transform-origin:bottom right;transition:opacity .2s cubic-bezier(.16,1,.3,1),transform .2s cubic-bezier(.16,1,.3,1),visibility .2s;pointer-events:none;margin-bottom:.5rem;background:var(--bg);border:1px solid var(--border);border-radius:12px;padding:.75rem .9rem;box-shadow:var(--shadow),0 8px 24px #0000001f;min-width:175px}.keyboard-hints-popover.visible{opacity:1;visibility:visible;transform:translateY(0) scale(1);pointer-events:auto}.keyboard-hints-popover-title{font-size:.75rem;font-weight:700;text-transform:uppercase;letter-spacing:.5px;color:var(--text);margin-bottom:.5rem;padding-bottom:.35rem;border-bottom:1px solid var(--border)}.keyboard-hints-list{display:flex;flex-direction:column;gap:.45rem}.keyboard-hints-row{display:flex;align-items:center;justify-content:space-between;gap:1.25rem;font-size:.825rem}.keyboard-hints-keys{display:inline-flex;align-items:center;gap:.25rem}.keyboard-hints-label{color:var(--text);font-weight:500}kbd{background:var(--code-bg);border:1px solid var(--border);border-radius:4px;padding:.15rem .45rem;font-family:var(--mono);font-size:.75rem;color:var(--text-h);box-shadow:0 1px 1px #00000014}#flashcard-fullscreen-container:fullscreen{background:var(--bg);display:flex;flex-direction:column;justify-content:center;align-items:center;padding:2rem;box-sizing:border-box}#flashcard-fullscreen-container:fullscreen .card-scene{width:100%;max-width:800px;height:480px}#flashcard-fullscreen-container:fullscreen .flashcard-toolbar,#flashcard-fullscreen-container:fullscreen .flashcard-progress-track,#flashcard-fullscreen-container:fullscreen .flashcard-navigation-bar{width:100%;max-width:800px}.learn-mode-view{width:100%;max-width:720px;margin:0 auto}.learn-status-bar{margin-bottom:1.5rem}.progress-labels{display:flex;justify-content:space-between;align-items:center;font-size:.9rem;font-weight:600;margin-bottom:.5rem}.learn-controls-right{display:flex;align-items:center;gap:.75rem}.btn-toolbar-sm{display:inline-flex;align-items:center;gap:.35rem;background:var(--code-bg);border:1px solid var(--border);color:var(--text-h);padding:.25rem .6rem;border-radius:6px;font-size:.8rem;font-weight:500;cursor:pointer;transition:all .2s ease}.btn-toolbar-sm:hover{border-color:var(--accent);color:var(--accent)}.mastered-count{display:inline-flex;align-items:center;gap:.35rem;color:#10b981}.learn-progress-track{width:100%;height:8px;background:var(--code-bg);border-radius:4px;overflow:hidden}.learn-progress-fill{height:100%;background:#10b981;transition:width .3s ease}.learn-card-container{background:var(--bg);border:1px solid var(--border);border-radius:20px;box-shadow:var(--shadow);padding:2.5rem}.learn-box-label{font-size:.8rem;font-weight:700;letter-spacing:1.5px;color:var(--accent);display:block;margin-bottom:.5rem}.learn-term-text{margin:0 0 1.5rem;font-size:2rem;color:var(--text-h)}.learn-hint-text{color:var(--text);font-size:.95rem;margin-bottom:1.5rem}.btn-reveal-answer{width:100%;display:flex;align-items:center;justify-content:center;gap:.5rem;padding:1rem;background:var(--accent);color:#fff;border:none;border-radius:12px;font-size:1.1rem;font-weight:600;cursor:pointer}.learn-answer-box{margin-top:1.5rem;padding-top:1.5rem;border-top:1px solid var(--border);animation:fadeIn .3s ease-out}.learn-def-text{font-size:1.5rem;font-weight:500;color:var(--text-h);margin:0 0 2rem}.learn-feedback-actions{display:grid;grid-template-columns:1fr 1fr;gap:1.5rem}.btn-feedback{padding:1rem;border-radius:12px;border:none;font-size:1.1rem;font-weight:700;cursor:pointer;display:flex;flex-direction:column;align-items:center;gap:.25rem;color:#fff;transition:transform .15s ease}.btn-feedback.incorrect{background:#f97316}.btn-feedback.correct{background:#10b981}.btn-feedback:hover{transform:translateY(-2px)}.shortcut-hint{font-size:.75rem;opacity:.85}.learn-summary-card{max-width:580px;margin:0 auto;background:var(--bg);border:1px solid var(--border);border-radius:20px;padding:3rem 2rem;text-align:center;box-shadow:var(--shadow)}.award-icon{color:#eab308}.accuracy-stat-box{margin:1.5rem 0}.accuracy-number{display:block;font-size:3.5rem;font-weight:800;color:#10b981}.accuracy-label{font-size:.95rem;color:var(--text)}.missed-terms-section{text-align:left;background:var(--code-bg);border-radius:12px;padding:1rem;margin-bottom:2rem}.missed-header{display:flex;align-items:center;gap:.5rem;font-weight:600;font-size:.9rem;margin-bottom:.75rem;color:#f97316}.missed-list{display:flex;flex-direction:column;gap:.5rem}.missed-item{display:flex;align-items:center;gap:.5rem;font-size:.9rem}.summary-actions{display:flex;flex-direction:column;gap:.75rem}.btn-practice-missed{padding:.85rem;border-radius:10px;border:1px solid #f97316;background:#f973161a;color:#f97316;font-weight:600;cursor:pointer}.btn-restart-round{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;padding:.85rem;border-radius:10px;border:none;background:var(--accent);color:#fff;font-weight:600;cursor:pointer}.match-mode-view{width:100%;max-width:860px;margin:0 auto}.match-header-bar{display:flex;align-items:center;justify-content:space-between;margin-bottom:1rem}.match-mode-badge{display:inline-flex;align-items:center;gap:.4rem;font-weight:700;color:#f59e0b}.match-header-stats{display:inline-flex;align-items:center;gap:.75rem}.match-best-pill{display:inline-flex;align-items:center;gap:.35rem;background:#f59e0b1f;border:1px solid rgba(245,158,11,.3);padding:.4rem .85rem;border-radius:9999px;font-family:var(--mono);font-size:.9rem;font-weight:600;color:#f59e0b}.match-timer-pill{position:relative;display:inline-flex;align-items:center;gap:.4rem;background:var(--code-bg);border:1px solid var(--border);padding:.4rem .85rem;border-radius:9999px;font-family:var(--mono);font-size:1.1rem;font-weight:700;color:var(--text-h);transition:all .2s ease}.match-timer-pill.penalty-flash{border-color:#ef4444;background:#ef444426;color:#ef4444}.penalty-tag{display:inline-flex;margin-left:.25rem;padding:.1rem .4rem;background:#ef4444;color:#fff;border-radius:6px;font-size:.75rem;font-weight:700;animation:pulse-badge .4s ease-out}@keyframes pulse-badge{0%{transform:scale(.8);opacity:0}50%{transform:scale(1.15);opacity:1}to{transform:scale(1);opacity:1}}.match-instructions{color:var(--text);margin-bottom:1.5rem}.match-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:1rem}@media(max-width:768px){.match-grid{grid-template-columns:repeat(2,1fr)}}.match-tile{min-height:100px;padding:1rem;background:var(--bg);border:2px solid var(--border);border-radius:14px;color:var(--text-h);font-size:1rem;font-weight:500;display:flex;align-items:center;justify-content:center;text-align:center;cursor:pointer;box-shadow:var(--shadow);transition:all .2s cubic-bezier(.4,0,.2,1)}.match-tile:hover:not(:disabled){border-color:var(--accent);transform:scale(1.02)}.match-tile.selected{border-color:#3b82f6;box-shadow:0 0 0 4px #3b82f640;background:#3b82f614}.match-tile.matched{opacity:0;transform:scale(.8);pointer-events:none}.match-tile.matching{border-color:#22c55e;background:#22c55e33;color:#22c55e;transform:scale(1.05);box-shadow:0 0 16px #22c55e73}.match-tile.mismatched{border-color:#ef4444;background:#ef444426;animation:shake .4s ease-in-out}@keyframes shake{0%,to{transform:translate(0)}25%{transform:translate(-6px)}75%{transform:translate(6px)}}.match-victory-card{max-width:500px;margin:2rem auto;padding:3rem 2rem;text-align:center;background:var(--bg);border:1px solid var(--border);border-radius:20px;box-shadow:var(--shadow)}.trophy-icon{color:#f59e0b}.victory-time-box{margin:1.5rem 0 2rem}.time-number{display:block;font-size:3.5rem;font-family:var(--mono);font-weight:800;color:#3b82f6}.time-label{font-size:.9rem;color:var(--text)}.penalty-note{display:block;font-size:.8rem;color:#ef4444;margin-top:.25rem}.btn-play-again{display:inline-flex;align-items:center;gap:.5rem;padding:.85rem 2rem;border-radius:12px;border:none;background:var(--accent);color:#fff;font-weight:600;cursor:pointer;transition:all .2s ease}.btn-play-again:hover{opacity:.95;transform:translateY(-1px)}.new-record-badge{margin-top:.75rem;display:inline-block;padding:.4rem 1rem;border-radius:9999px;background:#f59e0b26;border:1px solid rgba(245,158,11,.35);color:#f59e0b;font-weight:700;font-size:.95rem;animation:pulse-badge .5s ease}.best-time-subtext{margin-top:.5rem;font-size:.9rem;color:var(--text)}.victory-actions{display:flex;align-items:center;justify-content:center;gap:.75rem;flex-wrap:wrap}.btn-secondary-action{display:inline-flex;align-items:center;gap:.5rem;padding:.85rem 1.5rem;border-radius:12px;border:1px solid var(--border);background:var(--code-bg);color:var(--text-h);font-weight:600;cursor:pointer;transition:all .2s ease}.btn-secondary-action:hover{background:var(--bg);border-color:var(--accent);transform:translateY(-1px)}.match-empty{text-align:center;padding:3rem 1.5rem;background:var(--bg);border:1px dashed var(--border);border-radius:14px;margin:2rem auto;max-width:500px;color:var(--text);display:flex;flex-direction:column;align-items:center;gap:1.25rem}.deck-terms-accordion{max-width:860px;margin:2rem auto 0}.btn-toggle-terms{width:100%;display:flex;align-items:center;gap:.5rem;padding:.85rem 1rem;background:var(--code-bg);border:1px solid var(--border);border-radius:10px;color:var(--text-h);font-weight:600;font-size:.95rem;cursor:pointer}.toggle-indicator{margin-left:auto;font-size:.8rem;color:var(--text)}.terms-table-list{margin-top:.75rem;background:var(--bg);border:1px solid var(--border);border-radius:12px;overflow:hidden}.term-list-row{display:flex;padding:1rem;border-bottom:1px solid var(--border);gap:1.5rem}.term-list-row:last-child{border-bottom:none}.term-index{font-weight:700;color:var(--accent);min-width:24px}.term-col{flex:1}.term-hint-badge{display:block;font-size:.8rem;color:var(--text);margin-top:.25rem}.def-col{flex:2;color:var(--text)}.btn-mode-toggle-pic{width:auto!important;height:22px!important;padding:0 6px!important;gap:3px!important;font-size:.75rem!important;font-weight:500!important}.btn-toggle-pic-label{font-size:.72rem;line-height:1}.image-face-picker{display:flex;flex-direction:column;gap:.5rem;min-height:200px;width:100%;box-sizing:border-box;padding:.6rem .75rem;border-radius:8px;border:1px dashed var(--border);background:var(--code-bg);position:relative;outline:none;transition:border-color .2s ease,background .2s ease}.image-face-picker:focus-within{border-color:var(--accent);background:var(--bg)}.picker-toolbar{display:flex;align-items:center;justify-content:space-between;gap:.5rem;margin-bottom:.25rem}.picker-label{display:flex;align-items:center;gap:.35rem;font-size:.75rem;font-weight:700;color:var(--accent);letter-spacing:.04em;text-transform:uppercase}.btn-switch-text{display:inline-flex;align-items:center;gap:.3rem;background:transparent;border:1px solid var(--border);border-radius:4px;padding:.2rem .5rem;font-size:.75rem;color:var(--muted);cursor:pointer;transition:all .15s ease}.btn-switch-text:hover{color:var(--text);border-color:var(--accent);background:var(--accent-bg)}.picker-input-zone{display:flex;flex-direction:column;justify-content:center;align-items:center;gap:.75rem;flex:1;padding:1rem .5rem}.picker-url-row{display:flex;align-items:center;gap:.4rem;width:100%;max-width:480px}.picker-input-icon{color:var(--muted);display:flex;align-items:center}.picker-url-input{flex:1;padding:.45rem .65rem;border-radius:6px;border:1px solid var(--border);background:var(--bg);color:var(--text);font-size:.85rem;outline:none;transition:border-color .15s ease}.picker-url-input:focus{border-color:var(--accent)}.btn-apply-url{padding:.45rem .85rem;border-radius:6px;border:none;background:var(--accent);color:#fff;font-size:.82rem;font-weight:600;cursor:pointer;transition:opacity .15s ease}.btn-apply-url:disabled{opacity:.5;cursor:not-allowed}.picker-paste-tip{font-size:.8rem;color:var(--muted);text-align:center;line-height:1.4}.picker-paste-tip strong{color:var(--accent)}.btn-cancel-edit{background:transparent;border:none;color:var(--muted);font-size:.78rem;text-decoration:underline;cursor:pointer}.picker-preview-wrapper{display:flex;flex-direction:column;align-items:center;gap:.6rem;flex:1;justify-content:center}.picker-thumbnail-frame{max-width:100%;max-height:110px;border-radius:6px;overflow:hidden;border:1px solid var(--border);background:#0003;display:flex;align-items:center;justify-content:center}.picker-thumbnail-img{max-width:100%;max-height:110px;object-fit:contain;display:block}.picker-preview-actions{display:flex;gap:.5rem}.btn-picker-action{display:inline-flex;align-items:center;gap:.35rem;padding:.3rem .65rem;border-radius:5px;border:1px solid var(--border);background:var(--bg);color:var(--text);font-size:.78rem;cursor:pointer;transition:all .15s ease}.btn-picker-action:hover{background:var(--accent-bg);border-color:var(--accent)}.btn-picker-action.btn-danger:hover{background:#ef44441a;border-color:#ef4444;color:#ef4444}.picker-caption-input{width:100%;max-width:380px;padding:.35rem .6rem;border-radius:5px;border:1px solid var(--border);background:var(--bg);color:var(--text);font-size:.8rem}.picker-paste-toast{position:absolute;bottom:.6rem;right:.75rem;background:var(--accent);color:#fff;font-size:.75rem;padding:.25rem .6rem;border-radius:4px;box-shadow:0 2px 8px #00000040;animation:fadeIn .2s ease}.image-face-container{display:flex;flex-direction:column;align-items:center;justify-content:center;position:relative;max-width:100%;max-height:100%;padding:.25rem}.image-face-container.clickable-zoom{cursor:zoom-in}.image-face-img{max-width:100%;max-height:230px;object-fit:contain;border-radius:8px;box-shadow:0 4px 14px #0000002e;transition:transform .2s ease,opacity .2s ease}.image-face-img.loading{opacity:0}.image-face-img.loaded{opacity:1}.image-face-container:hover .image-face-img{transform:scale(1.015)}.image-face-skeleton{width:180px;height:140px;border-radius:8px;background:linear-gradient(90deg,var(--code-bg) 25%,var(--border) 50%,var(--code-bg) 75%);background-size:200% 100%;animation:shimmer 1.5s infinite}@keyframes shimmer{0%{background-position:200% 0}to{background-position:-200% 0}}.btn-image-zoom-trigger{position:absolute;bottom:.5rem;right:.5rem;display:flex;align-items:center;justify-content:center;width:26px;height:26px;border-radius:50%;border:1px solid rgba(255,255,255,.2);background:#000000a6;color:#fff;cursor:pointer;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);transition:all .15s ease}.btn-image-zoom-trigger:hover{background:var(--accent);transform:scale(1.1)}.image-face-caption{margin-top:.5rem;font-size:.9rem;color:var(--muted);text-align:center;max-width:90%;word-break:break-word}.image-face-error{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:.5rem;padding:1.5rem;border-radius:8px;border:1px dashed var(--border);background:#ef44440d;color:var(--muted)}.image-error-icon{color:#ef4444}.image-error-text{font-size:.85rem;font-weight:500}.image-lightbox-backdrop{position:fixed;top:0;left:0;right:0;bottom:0;background:#000000d9;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);z-index:10000;display:flex;align-items:center;justify-content:center;padding:2rem;animation:fadeIn .2s ease}.btn-lightbox-close{position:absolute;top:1.5rem;right:1.5rem;width:40px;height:40px;border-radius:50%;border:1px solid rgba(255,255,255,.25);background:#0009;color:#fff;display:flex;align-items:center;justify-content:center;cursor:pointer;transition:all .15s ease}.btn-lightbox-close:hover{background:#ef4444;border-color:#ef4444;transform:scale(1.08)}.image-lightbox-content{display:flex;flex-direction:column;align-items:center;max-width:90vw;max-height:88vh}.image-lightbox-img{max-width:90vw;max-height:80vh;object-fit:contain;border-radius:8px;box-shadow:0 8px 30px #00000080}.image-lightbox-caption{margin-top:1rem;color:#f1f5f9;font-size:1rem;text-align:center}.match-tile.match-tile-image{padding:.5rem;display:flex;align-items:center;justify-content:center}.tile-image-wrapper{display:flex;flex-direction:column;align-items:center;justify-content:center;width:100%;height:100%;gap:.25rem}.tile-image-thumb{max-width:100%;max-height:72px;object-fit:contain;border-radius:4px}.tile-image-caption{font-size:.72rem;color:var(--muted);text-align:center;line-height:1.2}