.vue-flow{position:relative;width:100%;height:100%;overflow:hidden;z-index:0;direction:ltr}.vue-flow__container{position:absolute;height:100%;width:100%;left:0;top:0}.vue-flow__pane{z-index:1}.vue-flow__pane.draggable{cursor:grab}.vue-flow__pane.selection{cursor:pointer}.vue-flow__pane.dragging{cursor:grabbing}.vue-flow__transformationpane{transform-origin:0 0;z-index:2;pointer-events:none}.vue-flow__viewport{z-index:4;overflow:clip}.vue-flow__selection{z-index:6}.vue-flow__edge-labels{position:absolute;width:100%;height:100%;pointer-events:none;-webkit-user-select:none;-moz-user-select:none;user-select:none}.vue-flow__nodesselection-rect:focus,.vue-flow__nodesselection-rect:focus-visible{outline:none}.vue-flow .vue-flow__edges{pointer-events:none;overflow:visible}.vue-flow__edge-path,.vue-flow__connection-path{stroke:#b1b1b7;stroke-width:1;fill:none}.vue-flow__edge{pointer-events:visibleStroke;cursor:pointer}.vue-flow__edge.animated path{stroke-dasharray:5;animation:dashdraw .5s linear infinite}.vue-flow__edge.animated path.vue-flow__edge-interaction{stroke-dasharray:none;animation:none}.vue-flow__edge.inactive{pointer-events:none}.vue-flow__edge.selected,.vue-flow__edge:focus,.vue-flow__edge:focus-visible{outline:none}.vue-flow__edge.selected .vue-flow__edge-path,.vue-flow__edge:focus .vue-flow__edge-path,.vue-flow__edge:focus-visible .vue-flow__edge-path{stroke:#555}.vue-flow__edge-textwrapper{pointer-events:all}.vue-flow__edge-text{pointer-events:none;-webkit-user-select:none;-moz-user-select:none;user-select:none}.vue-flow__connection{pointer-events:none}.vue-flow__connection .animated{stroke-dasharray:5;animation:dashdraw .5s linear infinite}.vue-flow__connectionline{z-index:1001}.vue-flow__nodes{pointer-events:none;transform-origin:0 0}.vue-flow__node{position:absolute;-webkit-user-select:none;-moz-user-select:none;user-select:none;pointer-events:all;transform-origin:0 0;box-sizing:border-box;cursor:default}.vue-flow__node.draggable{cursor:grab;pointer-events:all}.vue-flow__node.draggable.dragging{cursor:grabbing}.vue-flow__nodesselection{z-index:3;transform-origin:left top;pointer-events:none}.vue-flow__nodesselection-rect{position:absolute;pointer-events:all;cursor:grab}.vue-flow__nodesselection-rect.dragging{cursor:grabbing}.vue-flow__handle{position:absolute;pointer-events:none;min-width:5px;min-height:5px}.vue-flow__handle.connectable{pointer-events:all;cursor:crosshair}.vue-flow__handle-bottom{left:50%;bottom:0;transform:translate(-50%,50%)}.vue-flow__handle-top{left:50%;top:0;transform:translate(-50%,-50%)}.vue-flow__handle-left{top:50%;left:0;transform:translate(-50%,-50%)}.vue-flow__handle-right{top:50%;right:0;transform:translate(50%,-50%)}.vue-flow__edgeupdater{cursor:move;pointer-events:all}.vue-flow__panel{position:absolute;z-index:5;margin:15px}.vue-flow__panel.top{top:0}.vue-flow__panel.bottom{bottom:0}.vue-flow__panel.left{left:0}.vue-flow__panel.right{right:0}.vue-flow__panel.center{left:50%;transform:translate(-50%)}@keyframes dashdraw{0%{stroke-dashoffset:10}}:root{--vf-node-bg: #fff;--vf-node-text: #222;--vf-connection-path: #b1b1b7;--vf-handle: #555}.vue-flow__edge.updating .vue-flow__edge-path{stroke:#777}.vue-flow__edge-text{font-size:10px}.vue-flow__edge-textbg{fill:#fff}.vue-flow__connection-path{stroke:var(--vf-connection-path)}.vue-flow__node{cursor:grab}.vue-flow__node.selectable:focus,.vue-flow__node.selectable:focus-visible{outline:none}.vue-flow__node-default,.vue-flow__node-input,.vue-flow__node-output{padding:10px;border-radius:3px;width:150px;font-size:12px;text-align:center;border-width:1px;border-style:solid;color:var(--vf-node-text);background-color:var(--vf-node-bg);border-color:var(--vf-node-color)}.vue-flow__node-default.selected,.vue-flow__node-default.selected:hover,.vue-flow__node-input.selected,.vue-flow__node-input.selected:hover,.vue-flow__node-output.selected,.vue-flow__node-output.selected:hover{box-shadow:0 0 0 .5px var(--vf-box-shadow)}.vue-flow__node-default.selected,.vue-flow__node-default:focus,.vue-flow__node-default:focus-visible,.vue-flow__node-input.selected,.vue-flow__node-input:focus,.vue-flow__node-input:focus-visible,.vue-flow__node-output.selected,.vue-flow__node-output:focus,.vue-flow__node-output:focus-visible{outline:none;border:1px solid #555}.vue-flow__node-default .vue-flow__handle,.vue-flow__node-input .vue-flow__handle,.vue-flow__node-output .vue-flow__handle{background:var(--vf-handle)}.vue-flow__node-default.selectable:hover,.vue-flow__node-input.selectable:hover,.vue-flow__node-output.selectable:hover{box-shadow:0 1px 4px 1px #00000014}.vue-flow__node-input{--vf-node-color: var(--vf-node-color, #0041d0);--vf-handle: var(--vf-node-color, #0041d0);--vf-box-shadow: var(--vf-node-color, #0041d0);background:var(--vf-node-bg);border-color:var(--vf-node-color, #0041d0)}.vue-flow__node-input.selected,.vue-flow__node-input:focus,.vue-flow__node-input:focus-visible{outline:none;border:1px solid var(--vf-node-color, #0041d0)}.vue-flow__node-default{--vf-handle: var(--vf-node-color, #1a192b);--vf-box-shadow: var(--vf-node-color, #1a192b);background:var(--vf-node-bg);border-color:var(--vf-node-color, #1a192b)}.vue-flow__node-default.selected,.vue-flow__node-default:focus,.vue-flow__node-default:focus-visible{outline:none;border:1px solid var(--vf-node-color, #1a192b)}.vue-flow__node-output{--vf-handle: var(--vf-node-color, #ff0072);--vf-box-shadow: var(--vf-node-color, #ff0072);background:var(--vf-node-bg);border-color:var(--vf-node-color, #ff0072)}.vue-flow__node-output.selected,.vue-flow__node-output:focus,.vue-flow__node-output:focus-visible{outline:none;border:1px solid var(--vf-node-color, #ff0072)}.vue-flow__nodesselection-rect,.vue-flow__selection{background:rgba(0,89,220,.08);border:1px dotted rgba(0,89,220,.8)}.vue-flow__nodesselection-rect:focus,.vue-flow__nodesselection-rect:focus-visible,.vue-flow__selection:focus,.vue-flow__selection:focus-visible{outline:none}.vue-flow__handle{width:6px;height:6px;background:var(--vf-handle);border:1px solid #fff;border-radius:100%}.vue-flow__controls{box-shadow:0 0 2px 1px #00000014}.vue-flow__controls-button{background:#fefefe;border:none;border-bottom:1px solid #eee;box-sizing:content-box;display:flex;justify-content:center;align-items:center;width:16px;height:16px;cursor:pointer;-webkit-user-select:none;user-select:none;padding:5px}.vue-flow__controls-button svg{width:100%;max-width:12px;max-height:12px}.vue-flow__controls-button:hover{background:#f4f4f4}.vue-flow__controls-button:disabled{pointer-events:none}.vue-flow__controls-button:disabled svg{fill-opacity:.4}:root{color:#17212b;background:#eef2f5;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;font-synthesis:none;text-rendering:optimizeLegibility}*{box-sizing:border-box}body{margin:0;min-width:320px;min-height:100vh;overflow-x:hidden}button,input,select,textarea{font:inherit}button{border:0}a{color:inherit;text-decoration:none}button:disabled{cursor:not-allowed;opacity:.55}.app-shell{min-height:100vh;padding:0 clamp(12px,2vw,22px) 22px}.menu-bar{position:sticky;top:0;z-index:1000;display:grid;grid-template-columns:minmax(210px,1fr) auto minmax(210px,1fr);align-items:center;gap:18px;min-height:68px;margin:0 calc(50% - 50vw) 22px;padding:10px max(22px,calc((100vw - 1480px)/2 + 22px));background:#1f6f68;color:#fff;box-shadow:0 10px 24px #174a453d}.menu-bar:has(.menu-auth-link){grid-template-columns:minmax(210px,1fr) auto}.brand-mark,.menu-page-title,.menu-actions{display:flex;align-items:center}.brand-mark{gap:10px;min-width:0;color:#fff;font-weight:900}.brand-mark img{width:42px;height:42px;border-radius:7px;box-shadow:0 7px 16px #001f5447}.brand-mark span{min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.menu-page-title{justify-content:center;gap:10px;min-width:0;color:#ffffffe6;text-align:center;font-size:.88rem;font-weight:850}.menu-book-logo{display:grid;width:30px;height:30px;flex:0 0 auto;place-items:center;border:1px solid rgba(255,255,255,.18);border-radius:8px;background:rgba(255,255,255,.11);box-shadow:inset 0 1px #ffffff29}.menu-book-logo svg{width:23px;height:23px}.book-shadow{fill:#05221f52;transform:translateY(1px)}.book-left,.book-right{fill:#f4ebd1;stroke:#fff8e6;stroke-width:.7}.book-right{fill:#fff4dc}.book-spine{fill:none;stroke:#1f6f68;stroke-linecap:round;stroke-width:1.25}.book-line{fill:none;stroke:#1f6f686b;stroke-linecap:round;stroke-width:1.15}.book-bookmark{fill:#d28622}.menu-page-title span{min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.menu-actions{justify-content:flex-end;gap:8px;min-width:0;flex-wrap:wrap}.menu-auth-link,.menu-actions button,.user-chip{min-height:38px;border-radius:999px;font-size:.84rem;font-weight:900}.menu-auth-link,.user-chip{display:inline-flex;align-items:center;color:#fff}.menu-auth-link{padding:0 13px;background:transparent}.menu-auth-link:hover,.menu-auth-link:focus-visible{outline:none}.menu-auth-signup{color:#ffffffd1}.menu-auth-signup:hover,.menu-auth-signup:focus-visible{color:#fff}.menu-auth-signin{min-width:90px;justify-content:center;background:#ffffff;color:#174a45;box-shadow:0 5px 14px #0a322e33}.menu-auth-signin:hover,.menu-auth-signin:focus-visible{background:#f4fbf9;box-shadow:0 7px 18px #0a322e47;transform:translateY(-1px)}.profile-menu-wrap{position:relative}.user-chip{gap:8px;min-width:0;max-width:210px;padding:0 12px 0 6px;border:0;background:rgba(255,255,255,.14);cursor:pointer}.user-chip span{display:grid;width:28px;min-width:28px;height:28px;min-height:28px;flex:0 0 28px;place-items:center;border-radius:50%;background:#f4dfbd;color:#5e3500;line-height:1}.user-chip strong{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.user-chip:hover,.user-chip:focus-visible,.user-chip[aria-expanded=true]{background:rgba(255,255,255,.22);outline:none}.profile-menu{position:absolute;top:calc(100% + 10px);right:0;z-index:1100;display:grid;gap:8px;width:250px;padding:10px;border:1px solid #d4dde4;border-radius:8px;background:#ffffff;color:#17212b;box-shadow:0 18px 38px #17212b2e}.profile-menu:before{position:absolute;top:-6px;right:26px;width:12px;height:12px;background:#ffffff;border-top:1px solid #d4dde4;border-left:1px solid #d4dde4;content:"";transform:rotate(45deg)}.profile-menu-heading{display:grid;gap:3px;padding:8px}.profile-menu-heading strong,.profile-menu-heading small{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.profile-menu-heading small{color:#647482;font-weight:750}.menu-actions .profile-menu button{min-height:38px;width:100%;border-radius:6px;background:#f4f7f9;color:#263441;text-align:left}.menu-actions .profile-menu button:hover,.menu-actions .profile-menu button:focus-visible{background:#fae9e6;color:#a13c2f;outline:none}.menu-actions button{padding:0 15px;color:#fff;cursor:pointer}.training-action-button{display:inline-flex;align-items:center;justify-content:center;gap:4px;white-space:nowrap}.training-action-button small{color:inherit;font-size:inherit;font-weight:inherit}.learn-button{background:rgba(255,255,255,.16)}.learn-button:hover{background:rgba(255,255,255,.24)}.review-button{background:#d28622}.review-button:hover{background:#b87219}#trainer,#opening-books,#book-page,#auth,#stats{scroll-margin-top:86px}.books-page{display:grid;gap:16px;max-width:1480px;margin:0 auto}.books-toolbar{display:flex;align-items:end;justify-content:space-between;gap:18px}.books-toolbar.compact{align-items:center;justify-content:flex-start}.books-status{display:grid;gap:6px;margin-right:0}.books-status p{margin:0}.books-toolbar p:last-child{margin-bottom:0}.books-toolbar p:not(.eyebrow):not(.form-message){margin:7px 0 0;color:#5e6d7a}.books-toolbar.compact p:not(.eyebrow):not(.form-message){margin:0}.book-page-layout{display:grid;grid-template-columns:minmax(0,3fr) minmax(280px,1fr);gap:16px;align-items:start}.repertoire-main,.repertoire-sidebar{display:grid;gap:16px;min-width:0}.repertoire-sidebar{position:sticky;top:98px;align-self:start}.book-page-layout .book-home-actions{grid-template-columns:1fr}.book-page-layout .book-action-card{min-height:118px}.book-page-layout .book-action-card strong{font-size:1.22rem}.book-page-layout .book-stat-card strong{font-size:2.25rem}.book-page-layout .book-control-panel{padding:28px}.book-page-layout .book-form{grid-template-columns:minmax(220px,1fr) minmax(220px,1fr);max-width:none}.book-page-layout .book-interval-grid{grid-template-columns:repeat(auto-fit,minmax(118px,1fr))}.book-page-layout .book-form-actions button{flex:1 1 130px}.chapter-page-hero{display:grid;grid-template-columns:116px minmax(0,1fr);gap:26px;align-items:center;padding:34px 0 18px}.chapter-page-logo{width:116px;height:116px;border-radius:8px;box-shadow:0 12px 28px #19222b24}.chapter-page-title{min-width:0}.chapter-page-title h2{margin-bottom:16px;font-size:clamp(1.8rem,3vw,2.6rem);line-height:1.05;overflow-wrap:anywhere}.chapter-breadcrumb{display:flex;flex-wrap:wrap;gap:12px;align-items:center;color:#6c7784;font-size:clamp(1.08rem,2vw,1.38rem);font-weight:900}.chapter-breadcrumb>button{padding:0;background:transparent;color:#6c7784;cursor:pointer;font-weight:900}.chapter-breadcrumb>button:hover,.chapter-breadcrumb>button:focus-visible{color:#1f6f68;outline:none}.chapter-breadcrumb>span{width:0;height:0;border-top:8px solid transparent;border-bottom:8px solid transparent;border-left:8px solid #6c7784}.chapter-title-inline{display:inline-flex;align-items:flex-start;min-width:0;color:#6c7784;overflow-wrap:anywhere}.chapter-edit-button{align-self:flex-start;min-width:24px;min-height:24px;margin-left:4px;padding:0;border-radius:50%;background:transparent;color:#1f6f68;cursor:pointer;font-size:.84rem;font-weight:900;line-height:1;transform:translateY(-4px)}.chapter-edit-button:hover,.chapter-edit-button:focus-visible{background:#f2f8f7;outline:none}.chapter-title-form{display:grid;grid-template-columns:minmax(180px,360px) auto auto;gap:8px;align-items:center}.chapter-title-form button{min-height:34px;padding:0 12px;border:1px solid #cbd6de;border-radius:6px;background:#ffffff;color:#263441;cursor:pointer;font-size:.82rem;font-weight:850}.chapter-title-form button:first-of-type{border-color:#1f6f68;background:#1f6f68;color:#fff}.chapter-lines-section{display:grid;gap:30px;margin-top:10px}.chapter-line-card{display:grid;gap:22px;padding:0 0 24px;overflow:hidden;border-radius:8px;background:#ffffff;box-shadow:0 14px 34px #19222b14}.chapter-line-heading{display:flex;align-items:center;justify-content:space-between;min-height:66px;padding:0 28px;border-bottom:1px solid #e2e7ec}.chapter-line-heading h3{margin:0;font-size:1.12rem;overflow-wrap:anywhere}.chapter-line-actions{display:inline-flex;flex:0 0 auto;flex-wrap:wrap;gap:8px;align-items:center;justify-content:flex-end}.chapter-line-box{display:inline-flex;min-height:30px;align-items:center;padding:0 10px;border-radius:999px;background:#e9f3f1;color:#1f6f68;font-size:.78rem;font-weight:900;white-space:nowrap}.line-review-button{min-height:38px;padding:0 16px;border:1px solid #cbd6de;border-radius:7px;background:#ffffff;color:#263441;cursor:pointer;font-weight:900}.line-review-button:hover,.line-review-button:focus-visible{border-color:#1f6f68;background:#f2f8f7;outline:none}.line-review-button.learn{border-color:#1f6f68;background:#1f6f68;color:#fff}.line-review-button.learn:hover,.line-review-button.learn:focus-visible{background:#185b55}.line-review-button.copy{background:#f7fafb}.line-review-button.copy:hover,.line-review-button.copy:focus-visible{border-color:#d28622;background:#fff6e8}.chapter-line-moves{margin:0;padding:0 28px;color:#747f8c;font-size:clamp(1rem,1.7vw,1.2rem);font-weight:850;line-height:1.55;overflow-wrap:anywhere}.chapter-line-copy-status{margin:-10px 0 0;padding:0 28px;color:#647482;font-size:.84rem;font-weight:850}.chapter-line-copy-status.error{color:#b23b2b}.book-back-button{justify-self:start;min-height:34px;padding:0 12px;border:1px solid #cbd6de;border-radius:6px;background:#ffffff;color:#263441;cursor:pointer;font-weight:850}.book-back-button:hover,.book-back-button:focus-visible{border-color:#1f6f68;background:#f2f8f7;outline:none}.book-back-button.compact{min-height:36px;padding:0 12px;font-size:.82rem}.book-home-actions{display:grid;grid-template-columns:repeat(3,minmax(220px,1fr));gap:14px}.book-action-card{display:grid;gap:8px;min-height:150px;padding:18px;border:1px solid #d4dde4;border-radius:8px;background:#ffffff;color:inherit;text-align:left;box-shadow:0 14px 34px #19222b14}button.book-action-card{cursor:pointer}button.book-action-card:hover,button.book-action-card:focus-visible,.chapter-card-button:hover,.chapter-card-button:focus-visible,.book-card-button:hover,.book-card-button:focus-visible{border-color:#1f6f68;background:#f2f8f7;outline:none}.book-action-card span{color:#60707f;font-size:.76rem;font-weight:850;text-transform:uppercase}.book-action-card strong{color:#17212b;font-size:1.45rem;line-height:1.1;overflow-wrap:anywhere}.book-action-card small{color:#5e6d7a;font-weight:750}.book-stat-card strong{font-size:2.6rem}.book-control-panel,.books-empty{display:grid;gap:14px;padding:28px;border:1px solid #d4dde4;border-radius:8px;background:#ffffff;box-shadow:0 14px 34px #19222b14}.books-empty{min-height:min(520px,calc(100vh - 250px));align-content:start;justify-items:start}.books-empty h2{font-size:1.8rem}.books-empty p{max-width:560px;color:#5e6d7a}.books-empty-steps{display:grid;gap:8px;max-width:680px;margin:14px 0 0;padding-left:22px;color:#263441;font-weight:800}.books-empty-steps li::marker{color:#20796d;font-weight:900}.create-book-button{min-width:150px;padding:0 18px}.book-control-heading{display:flex;align-items:start;justify-content:space-between;gap:16px}.book-control-heading p:last-child{max-width:620px;margin:8px 0 0;color:#5e6d7a}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;z-index:1400;display:grid;place-items:center;padding:clamp(14px,3vw,32px);overflow:auto;background:rgba(16,27,36,.46);-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px)}.modal-panel{width:min(760px,100%);max-height:min(860px,calc(100vh - 36px));overflow:auto}.modal-close-button{display:grid;width:34px;height:34px;flex:0 0 auto;place-items:center;border:1px solid #cbd6de;border-radius:7px;background:#ffffff;color:#263441;cursor:pointer;font-size:1.3rem;font-weight:850;line-height:1}.modal-close-button:hover,.modal-close-button:focus-visible{border-color:#1f6f68;background:#f2f8f7;outline:none}.book-form{display:grid;grid-template-columns:minmax(220px,1fr) minmax(220px,1fr);gap:14px;max-width:860px}.book-form label,.book-color-field{display:grid;gap:7px;min-width:0;color:#42515f;font-size:.78rem;font-weight:850}.book-color-field{padding:0;border:0;margin:0}.book-color-field legend{padding:0;margin-bottom:7px}.book-color-toggle{display:grid;grid-template-columns:repeat(2,1fr);gap:4px;padding:4px;border:1px solid #d8e0e6;border-radius:8px;background:#f4f7f9}.book-color-toggle button{min-height:40px;border-radius:6px;background:transparent;color:#263441;cursor:pointer;font-weight:850}.book-color-toggle button.active{background:#1f6f68;color:#fff}.book-interval-summary{display:grid;grid-template-columns:auto minmax(0,1fr);gap:10px;align-items:center}.book-interval-summary>span{overflow:hidden;color:#647482;font-size:.78rem;font-weight:850;text-overflow:ellipsis;white-space:nowrap}.book-interval-toggle{min-height:38px;padding:0 14px;border:1px solid #cbd6de;border-radius:6px;background:#ffffff;color:#263441;cursor:pointer;font-weight:850}.book-interval-toggle:hover,.book-interval-toggle:focus-visible{border-color:#1f6f68;background:#f2f8f7;outline:none}.book-interval-field{display:grid;gap:10px;min-width:0;padding:14px;border:1px solid #d8e0e6;border-radius:8px;background:#fbfcfd;color:#42515f;font-size:.78rem;font-weight:850}.book-interval-field legend{padding:0 4px}.book-interval-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(118px,1fr));gap:10px}.book-interval-grid label{gap:5px}.book-interval-grid span{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:6px;align-items:center}.book-interval-grid small{min-width:58px;color:#647482;font-size:.72rem;font-weight:850;text-align:right}.book-form-full,.book-form-actions,.book-form .form-message{grid-column:1 / -1}.book-form-actions{display:flex;flex-wrap:wrap;gap:10px}.book-form-actions button{min-height:40px;min-width:126px;padding:0 16px;border-radius:6px;cursor:pointer;font-weight:850}.book-form-actions button:not(.primary-button){border:1px solid #cbd6de;background:#ffffff;color:#263441}.book-form-actions button:not(.primary-button):hover{border-color:#1f6f68;background:#f2f8f7}.book-form-actions .danger-button{border-color:#f0c2ba;background:#fff8f6;color:#a23a30}.book-form-actions .danger-button:hover,.book-form-actions .danger-button:focus-visible{border-color:#c94d3e;background:#ffece8;color:#812d25;outline:none}.book-form-actions .danger-button:disabled{cursor:not-allowed;opacity:.7}.form-help{display:block;margin-top:6px;color:#647482;font-size:.76rem;font-weight:750;line-height:1.35}.form-help a{color:#1f6f68;font-weight:900;text-decoration:underline;text-underline-offset:2px}.form-help a:hover,.form-help a:focus-visible{color:#185b55}.import-private-toggle{display:flex;align-items:center;gap:10px;min-height:40px;color:#263441;font-weight:850}.import-private-toggle input{width:18px;height:18px;accent-color:#1f6f68}.import-form textarea{min-height:210px;font-family:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,Liberation Mono,monospace;font-size:.88rem}.import-source-divider{grid-column:1 / -1;display:grid;grid-template-columns:minmax(0,1fr) auto minmax(0,1fr);gap:12px;align-items:center;color:#647482;font-size:.72rem;font-weight:900}.import-source-divider:before,.import-source-divider:after{height:1px;background:#d8e1e7;content:""}.import-source-divider span{padding:0 2px}.file-upload input{height:auto;padding:9px 10px}.file-upload small{color:#1f6f68;font-size:.76rem;font-weight:850}.import-validation-log{grid-column:1 / -1;max-height:280px;margin:0;overflow:auto;padding:14px;border:1px solid #f0c9c2;border-radius:6px;background:#fff8f6;color:#7e2e25;font-family:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,Liberation Mono,monospace;font-size:.82rem;line-height:1.55;white-space:pre-wrap}.books-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:14px}.book-card{display:grid;gap:10px;min-height:170px;padding:18px;border:1px solid #d4dde4;border-radius:8px;background:#ffffff;box-shadow:0 14px 34px #19222b14}.book-card-button{cursor:pointer}.book-card-topline{display:flex;align-items:center;justify-content:space-between;gap:10px}.book-card-topline small{display:inline-flex;align-items:center;min-height:28px;border-radius:999px;font-size:.74rem;font-weight:900}.book-card-topline small{color:#647482}.book-color-badge{display:inline-flex;min-height:28px;align-items:center;padding:0 13px;border-radius:999px;font-size:.74rem;font-weight:950;line-height:1;white-space:nowrap}.book-color-badge.white{background:#f2f8f7;color:#1f6f68}.book-color-badge.black{background:#eef0f2;color:#263441}.book-card p{margin:0;color:#5e6d7a;overflow-wrap:anywhere}.book-card dl{display:grid;gap:8px;margin:auto 0 0}.book-card dl div{display:grid;grid-template-columns:88px minmax(0,1fr);gap:10px;align-items:baseline}.book-card dt,.book-card dd{margin:0}.book-card dt{color:#647482;font-size:.76rem;font-weight:800}.book-card dd{overflow:hidden;color:#263441;font-size:.82rem;font-weight:850;text-overflow:ellipsis;white-space:nowrap}.section-heading{display:flex;align-items:end;justify-content:space-between;gap:14px}.section-heading>div{min-width:0}.chapter-heading-main{display:grid;justify-items:start;gap:10px}.section-count{color:#647482;font-size:.82rem;font-weight:850;white-space:nowrap}.book-chapter-heading-title{display:flex;align-items:center;gap:14px;flex-wrap:wrap}.book-chapter-heading-title>span:first-child{min-width:0;overflow-wrap:anywhere}.create-chapter-button{min-width:150px;min-height:40px;padding:0 18px}.chapters-section{display:grid;gap:14px}.chapters-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:14px}.chapter-card,.chapters-empty{border:1px solid #d4dde4;border-radius:8px;background:#ffffff;box-shadow:0 14px 34px #19222b14}.chapter-card{display:grid;gap:12px;min-height:190px;padding:18px}.chapter-card-button{cursor:pointer}.chapter-card-topline{display:flex;align-items:center;justify-content:space-between;gap:10px}.chapter-card-topline span,.chapter-card-topline small{overflow:hidden;color:#647482;font-size:.74rem;font-weight:850;text-overflow:ellipsis;white-space:nowrap}.chapter-delete-button{min-height:32px;flex:0 0 auto;padding:0 10px;border:1px solid #d7a39d;border-radius:7px;background:#fff7f5;color:#b6463f;cursor:pointer;font-size:.74rem;font-weight:900}.chapter-delete-button:hover,.chapter-delete-button:focus-visible{border-color:#b6463f;background:#fde8e4;outline:none}.chapter-delete-button:disabled{opacity:.58;cursor:wait}.chapter-card h3{overflow-wrap:anywhere}.chapter-card dl{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px;margin:auto 0 0}.chapter-action-row{display:grid;grid-template-columns:repeat(auto-fit,minmax(138px,1fr));gap:8px}.chapter-review-button{display:inline-flex;min-height:40px;align-items:center;justify-content:center;gap:8px;padding:0 10px;border:1px solid #1f6f68;border-radius:7px;background:#1f6f68;color:#fff;cursor:pointer;font-weight:900}.chapter-review-button:hover,.chapter-review-button:focus-visible{background:#185b55;outline:none}.chapter-review-button.learn{border-color:#23857c;background:#23857c}.chapter-review-button.review{border-color:#d28622;background:#d28622}.chapter-review-button.review:hover,.chapter-review-button.review:focus-visible{background:#bd7319}.chapter-review-button.delete{border-color:#b6463f;background:#b6463f}.chapter-review-button.delete:hover,.chapter-review-button.delete:focus-visible{background:#9f342e}.chapter-review-button span{display:inline-grid;min-width:38px;height:30px;flex:0 0 auto;box-sizing:border-box;place-items:center;padding:0 10px;border-radius:999px;background:rgba(255,255,255,.18);color:#fff;font-size:.84rem;line-height:1;font-variant-numeric:tabular-nums}.chapter-review-button:disabled{border-color:#cbd6de;background:#eef3f6;color:#7a8793;cursor:not-allowed}.chapter-review-button:disabled span{background:rgba(122,135,147,.16);color:#7a8793}.chapter-card dl div{min-height:68px;padding:10px;border:1px solid #d8e0e6;border-radius:8px;background:#fbfcfd}.chapter-card dt,.chapter-card dd{margin:0}.chapter-card dt{display:flex;align-items:center;gap:5px;color:#647482;font-size:.72rem;font-weight:850}.chapter-card dd{margin-top:5px;color:#17212b;font-size:1.35rem;font-weight:900}.time-icon{position:relative;display:inline-block;width:13px;height:13px;flex:0 0 auto;border:2px solid #1f6f68;border-radius:50%}.time-icon:before,.time-icon:after{position:absolute;left:50%;bottom:50%;width:2px;border-radius:999px;background:#1f6f68;content:"";transform-origin:bottom center}.time-icon:before{height:4px;transform:translate(-50%)}.time-icon:after{height:3px;transform:translate(-50%) rotate(90deg)}.chapters-empty{display:grid;gap:14px;min-height:240px;align-content:start;padding:18px;color:#5e6d7a}.chapters-empty-copy{display:grid;gap:8px}.chapters-empty strong{color:#17212b;font-size:1.15rem}.chapters-empty p{max-width:880px;margin:0;color:#5e6d7a;font-weight:750}.chapters-empty-rules{display:grid;gap:8px;max-width:980px;margin:0;padding-left:22px;color:#263441;font-weight:800}.chapters-empty-rules li::marker{color:#20796d;font-weight:900}.landing-page{display:grid;grid-template-columns:minmax(0,1.08fr) minmax(340px,460px);gap:clamp(26px,4vw,58px);align-items:start;max-width:1480px;min-height:min(760px,calc(100vh - 128px));margin:0 auto 18px;padding:clamp(24px,5vw,62px);border:1px solid #d4dde4;border-radius:8px;background:radial-gradient(circle at 18% 22%,rgba(32,121,109,.1),transparent 28%),linear-gradient(135deg,#ffffff 0%,#f8fbfa 54%,#eef4f6 100%);box-shadow:0 14px 34px #19222b14}.landing-copy{display:grid;gap:16px;max-width:820px}.landing-copy h1{max-width:680px;font-size:clamp(2.35rem,4.2vw,4.4rem);line-height:1.02}.landing-lede{max-width:680px;margin:0;color:#5e6d7a;font-size:clamp(1.1rem,1.6vw,1.35rem);font-weight:750;line-height:1.3}.landing-visual{width:min(100%,560px);margin-top:4px}.landing-board-preview{position:relative;display:grid;grid-template-columns:repeat(8,1fr);width:min(100%,500px);aspect-ratio:1;overflow:hidden;border:8px solid #1f2b31;border-radius:8px;background:#eeeed2;box-shadow:0 22px 42px #19222b2e}.landing-board-square{background:#eeeed2}.landing-board-square.dark{background:#779556}.landing-piece{position:absolute;z-index:2;width:14%;height:14%;object-fit:contain;transform:translate(-50%,-50%);filter:drop-shadow(0 3px 3px rgba(25,34,43,.22))}.landing-piece-br{top:6.25%;left:6.25%}.landing-piece-bk{top:6.25%;left:81.25%}.landing-piece-bq{top:43.75%;left:43.75%}.landing-piece-bn{top:31.25%;left:31.25%}.landing-piece-wk{top:93.75%;left:81.25%}.landing-piece-wq{top:93.75%;left:43.75%}.landing-piece-wn{top:68.75%;left:31.25%}.landing-piece-wp{top:56.25%;left:31.25%}.landing-move-card,.landing-review-card{position:absolute;z-index:3;right:14px;display:inline-flex;align-items:center;min-height:38px;padding:8px 12px;border-radius:999px;background:rgba(255,255,255,.92);color:#17222d;font-size:.9rem;font-weight:900;box-shadow:0 10px 24px #19222b29}.landing-move-card{bottom:62px}.landing-review-card{bottom:14px;background:rgba(243,184,90,.94)}.landing-how{display:grid;gap:12px;max-width:820px;margin-top:8px;padding-top:16px;border-top:1px solid #d8e1e7}.landing-how h2{font-size:clamp(1.35rem,2vw,1.9rem)}.landing-how p{max-width:760px;margin:0;color:#5e6d7a;font-size:1.02rem;font-weight:750;line-height:1.38}.landing-steps{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;margin-top:2px}.landing-step{display:grid;grid-template-columns:34px minmax(0,1fr);align-items:center;gap:10px;min-height:64px;padding:12px 14px;border:1px solid #d8e1e7;border-radius:8px;background:rgba(255,255,255,.74);color:#263441;font-weight:900;line-height:1.18}.landing-step span{display:grid;place-items:center;width:34px;height:34px;border-radius:999px;background:#eff7f5;font-size:1.05rem}.landing-benefits{display:grid;gap:8px;margin:4px 0 0;padding:0;list-style:none;color:#42515f;font-size:.98rem;font-weight:850}.landing-benefits li{position:relative;padding-left:28px;line-height:1.32}.landing-benefits li:before{content:"✓";position:absolute;top:0;left:0;display:grid;place-items:center;width:20px;height:20px;border-radius:999px;background:#20796d;color:#fff;font-size:.78rem;font-weight:950}.landing-conversion-panel{display:grid;gap:24px;align-self:start;padding:clamp(28px,4vw,42px);border:1px solid #d4dde4;border-radius:8px;background:#ffffff;color:#17222d;box-shadow:0 24px 60px #19222b24}.landing-conversion-icon{display:grid;place-items:center;width:72px;height:72px;border-radius:50%;background:#e5f3ef;color:#20796d;font-size:2.6rem;box-shadow:inset 0 0 0 1px #20796d1f}.landing-conversion-panel>div{display:grid;gap:12px}.landing-conversion-panel h2{color:#17222d;font-size:clamp(1.8rem,2.6vw,2.6rem);line-height:1.08}.landing-conversion-panel p{margin:0;color:#5e6d7a;font-weight:750;line-height:1.35}.landing-register-button{min-height:58px;font-size:1.08rem}.auth-page{position:relative;display:grid;place-items:start center;min-height:calc(100vh - 112px);margin:0 calc(50% - 50vw) -22px;padding:clamp(28px,6vh,72px) 20px 56px;overflow:hidden;background:linear-gradient(rgba(238,242,245,.92),rgba(238,242,245,.96)),repeating-conic-gradient(from 45deg,#dbe8df 0 25%,#f5f7ed 0 50%) 50% / 120px 120px}.auth-page:before{position:absolute;top:0;right:0;bottom:0;left:0;background:radial-gradient(circle at 50% 18%,rgba(32,121,109,.14),transparent 36%);content:"";pointer-events:none}.auth-page-shell{position:relative;z-index:1;display:grid;gap:22px;width:min(100%,560px)}.auth-back-button{display:inline-flex;align-items:center;gap:8px;justify-self:start;padding:7px 0;background:transparent;color:#42515f;cursor:pointer;font-weight:850}.auth-back-button:hover,.auth-back-button:focus-visible{color:#20796d}.auth-page-heading{display:grid;gap:10px;text-align:center}.auth-page-heading h1{color:#17222d;font-size:clamp(2.15rem,5vw,3.45rem);line-height:1.04}.auth-page-heading p:last-child{max-width:430px;margin:0 auto;color:#5e6d7a;font-size:1.05rem;font-weight:750}.auth-panel{display:grid;gap:20px;padding:clamp(24px,5vw,38px);border:1px solid #d4dde4;border-radius:8px;background:#ffffff;box-shadow:0 24px 60px #19222b24}.auth-page-switch{padding:17px 20px;border:1px solid #d4dde4;border-radius:8px;background:rgba(255,255,255,.82)}.social-auth-button{display:flex;align-items:center;justify-content:center;gap:12px;min-height:52px;width:100%;border:1px solid #d4dde4;border-radius:8px;background:#ffffff;color:#17222d;cursor:pointer;font-size:1rem;font-weight:850}.social-auth-button:hover:not(:disabled){border-color:#20796d;background:#eff7f5}.google-mark{width:25px;height:25px;flex:0 0 auto}.auth-divider{display:grid;grid-template-columns:minmax(0,1fr) auto minmax(0,1fr);align-items:center;gap:14px;color:#647482;font-size:.92rem;font-weight:850}.auth-divider span{height:1px;background:#d8e1e7}.cloud-status{display:inline-grid;gap:2px;margin-top:12px;padding:7px 10px;border-radius:6px;background:#f2f8f7;color:#1f6f68;font-size:.8rem;font-weight:850}.cloud-status small{color:#647482;font-weight:750}.cloud-status.error{background:#fae9e6;color:#a13c2f}.cloud-status.error small{color:#a13c2f}.auth-form{display:grid;grid-template-columns:1fr;gap:14px}.auth-form label{display:grid;gap:8px;color:#42515f;font-size:.95rem;font-weight:900}.auth-form input{min-height:52px;border-color:#cdd8e0;background:#ffffff;color:#17222d;font-size:1rem}.auth-form input::placeholder{color:#7d8894}.auth-form .primary-button,.auth-form .form-message{grid-column:1 / -1}.auth-submit-button{min-height:52px;margin-top:4px;background:#20796d;color:#fff}.auth-submit-button:hover:not(:disabled){background:#1a665d;color:#fff}.auth-switch{margin:0;color:#5e6d7a;text-align:center;font-weight:750}.auth-switch button{color:#20796d;text-decoration:underline;text-underline-offset:3px;cursor:pointer;font:inherit;font-weight:900}.auth-session{display:grid;grid-template-columns:auto minmax(0,1fr) auto;gap:12px;align-items:center;justify-self:end;width:min(100%,520px)}.auth-avatar{display:grid;width:44px;height:44px;place-items:center;border-radius:50%;background:#1f6f68;color:#fff;font-weight:900}.auth-session strong,.auth-session small{display:block}.auth-session strong{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.auth-session small{margin-top:3px;color:#647482;font-weight:750}.auth-session button{min-height:38px;padding:0 14px;border:1px solid #cbd6de;border-radius:6px;background:#ffffff;color:#263441;cursor:pointer;font-weight:850}.auth-session button:hover{border-color:#1f6f68;background:#f2f8f7}.topbar{display:flex;align-items:center;justify-content:space-between;gap:20px;margin:0 auto 18px;max-width:1480px}.eyebrow{margin:0 0 5px;color:#60707f;font-size:.75rem;font-weight:800;letter-spacing:0;text-transform:uppercase}h1,h2,h3,p{margin-top:0}h1{margin-bottom:0;font-size:clamp(1.8rem,3vw,2.55rem);line-height:1.04}h2{margin-bottom:0;font-size:1.35rem;line-height:1.15}h3{margin-bottom:8px;font-size:1.08rem;line-height:1.2}.stat-strip{display:grid;grid-template-columns:repeat(4,minmax(76px,1fr));gap:8px;min-width:min(440px,100%)}.stat,.session-stats div{min-height:64px;padding:10px 12px;border:1px solid #d8e0e6;border-radius:8px;background:#ffffff}.stat span,.session-stats span{display:block;color:#111923;font-size:1.25rem;font-weight:850}.stat small,.session-stats small,.box-badge small{display:block;margin-top:3px;color:#647482;font-size:.76rem;font-weight:700}.learn-workspace{display:grid;grid-template-columns:minmax(260px,300px) minmax(0,1fr);gap:18px;width:100%;max-width:1480px;margin:0 auto;touch-action:manipulation}.learn-queue-panel,.trainer-panel{border:1px solid #d4dde4;border-radius:8px;background:#ffffff;box-shadow:0 14px 34px #19222b14}.learn-queue-panel{align-self:start;max-height:calc(100vh - 98px);overflow:auto;padding:0}.training-tabs{display:grid;grid-template-columns:repeat(2,1fr);border-bottom:1px solid #d8e0e6;background:#ffffff}.view-tabs{display:grid;grid-template-columns:repeat(2,1fr);gap:6px;padding:10px;border-bottom:1px solid #d8e0e6;background:#f4f7f9}.view-tabs button{min-height:40px;border:1px solid transparent;border-radius:7px;background:transparent;color:#647482;cursor:pointer;font-size:.82rem;font-weight:900}.view-tabs button.active{border-color:#1f6f68;background:#ffffff;color:#1f6f68;box-shadow:0 8px 18px #1f6f681f}.view-tabs button:hover,.view-tabs button:focus-visible{border-color:#1f6f68;outline:none}.training-tabs button{min-height:56px;border-bottom:3px solid transparent;background:transparent;color:#8a96a1;cursor:pointer;font-weight:900}.training-tabs button.active{border-bottom-color:#1fb75a;color:#1f9e54}.training-tabs span{display:inline-grid;min-width:24px;height:24px;margin-left:6px;place-items:center;padding:0 7px;border-radius:999px;background:#d9f5e4;color:#168243;font-size:.72rem}.training-book-card{display:grid;grid-template-columns:62px minmax(0,1fr);gap:12px;align-items:center;padding:14px 16px;border-bottom:1px solid #e4e9ee;background:#ffffff}.training-book-card img{width:62px;height:62px;border-radius:7px;box-shadow:0 8px 18px #17212b24}.training-book-card label,.training-chapter-picker{display:grid;gap:6px;color:#657381;font-size:.78rem;font-weight:900}.training-book-card select,.training-chapter-picker select{height:34px;border-radius:5px;font-size:.86rem;font-weight:800}.training-chapter-picker{padding:12px 16px;border-bottom:1px solid #e4e9ee;background:#f4f7fb}.panel-heading,.trainer-header{display:flex;align-items:flex-start;justify-content:space-between;gap:14px}.panel-heading{margin:0;padding:14px 16px 0}.panel-heading.compact{margin-top:18px}.panel-heading span{color:#667887;font-size:.82rem;font-weight:750}.control-row button,.grade-row button,.learn-complete-actions button,.primary-button{min-height:38px;border-radius:6px;background:transparent;color:#263441;cursor:pointer;font-weight:800}.line-list{display:grid;gap:8px;margin-top:0;padding:14px 0 16px}.line-list-empty{margin:14px 16px 16px;padding:16px;border:1px solid #d8e0e6;border-radius:8px;background:#fbfcfd;color:#647482;font-weight:850}.line-list-empty p{margin:0}.line-list-empty .primary-button{width:100%;margin-top:12px;padding:0 12px;border:1px solid #1f6f68;white-space:normal}.line-row{display:grid;gap:7px;width:100%;min-height:58px;padding:10px 16px;border:0;border-left:4px solid transparent;border-radius:0;background:#ffffff;color:inherit;text-align:left;cursor:pointer}.line-row:hover,.line-row.active{border-left-color:#1fb75a;background:#20b957;color:#fff}.line-row.learned{border-left-color:#9fb0bb;background:#f8fafb}.line-title{overflow-wrap:anywhere;font-weight:850}.line-meta{display:flex;flex-wrap:wrap;gap:6px}.line-meta span{padding:3px 7px;border-radius:999px;background:#e8edf1;color:#50606e;font-size:.72rem;font-weight:800}.line-row.active .line-meta span,.line-row:hover .line-meta span{background:rgba(255,255,255,.2);color:#fff}input,select,textarea{width:100%;border:1px solid #c9d4dc;border-radius:6px;background:#ffffff;color:#17212b;outline:none}input,select{height:40px;padding:0 10px}textarea{resize:vertical;min-height:90px;padding:10px;line-height:1.35}input:focus,select:focus,textarea:focus{border-color:#1f6f68;box-shadow:0 0 0 3px #1f6f6824}.primary-button{background:#1f6f68;color:#fff}.primary-button:hover{background:#175a55}.form-message{margin:0;font-size:.82rem;font-weight:750}.form-message.error{color:#a13c2f}.form-message.success{color:#1f6f68}.trainer-panel{min-width:0;padding:18px}.learn-trainer-panel{padding:0;border:0;background:transparent;box-shadow:none}.trainer-header{margin-bottom:10px}.trainer-header p:last-child{margin:8px 0 0;color:#5e6d7a;overflow-wrap:anywhere}.learn-header-actions{display:flex;flex:0 0 auto;align-items:center;gap:10px}.box-badge{min-width:104px;padding:10px 12px;border:1px solid #d8e0e6;border-radius:8px;background:#f5f8fa;text-align:right}.box-badge.compact{min-width:96px;padding:8px 10px}.box-badge span{display:block;color:#1f6f68;font-weight:900}.training-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(260px,320px);gap:18px;align-items:start;min-width:0;width:100%}.board-column{display:grid;gap:10px;min-width:0}.book-view-controls{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;align-items:center;width:min(100%,calc(100vh - 118px),800px);margin:0 auto}.book-view-controls button{min-height:42px;border:1px solid #cbd6de;border-radius:8px;background:#ffffff;color:#263441;cursor:pointer;font-weight:900}.book-view-controls button:hover,.book-view-controls button:focus-visible{border-color:#1f6f68;background:#f2f8f7;outline:none}.book-view-controls button:disabled{color:#95a1ac;cursor:not-allowed;background:#eef3f6}.book-view-grid .square{cursor:default}.board-context-menu{position:fixed;z-index:1400;min-width:144px;padding:6px;border:1px solid #cbd6de;border-radius:7px;background:#ffffff;box-shadow:0 12px 28px #141f2738}.board-context-menu button{width:100%;min-height:36px;padding:7px 10px;border:0;border-radius:5px;background:transparent;color:#263441;cursor:pointer;font-weight:900;text-align:left}.board-context-menu button:hover,.board-context-menu button:focus-visible{background:#e9f3f1;color:#1f6f68;outline:none}@media (min-width: 1121px){.app-shell.training-app-shell{display:grid;grid-template-rows:auto minmax(0,1fr);height:100vh;height:100dvh;min-height:0;overflow:hidden;padding-bottom:12px}.training-app-shell .menu-bar{position:relative;margin-bottom:12px}.training-app-shell .books-page,.training-app-shell .learn-workspace,.training-app-shell .trainer-panel,.training-app-shell .training-grid,.training-app-shell .board-column,.training-app-shell .session-panel{min-height:0}.training-app-shell .books-page,.training-app-shell .learn-workspace,.training-app-shell .training-grid{height:100%}.training-app-shell .books-page,.training-app-shell .trainer-panel,.training-app-shell .training-grid,.training-app-shell .session-panel{overflow:hidden}.training-app-shell .learn-queue-panel{align-self:stretch;max-height:none;min-height:0;overflow-y:auto}.training-app-shell .board-frame,.training-app-shell .solve-timer,.training-app-shell .book-view-controls{width:min(100%,calc(100dvh - 156px),800px)}.training-app-shell .movesheet{min-height:0;overflow-y:auto}.training-app-shell .book-view-panel{grid-template-rows:auto auto minmax(0,1fr) auto;align-content:stretch;height:100%}}.board-shell{display:grid;place-items:center;min-width:0;width:100%;touch-action:none}.board-shell.has-evaluation{box-sizing:border-box;padding-right:28px}.board-frame{position:relative;width:min(100%,calc(100vh - 118px),800px);touch-action:none}.evaluation-bar{position:absolute;z-index:4;top:0;bottom:0;right:-28px;width:24px;overflow:hidden;border:2px solid #26322d;border-radius:0 5px 5px 0;background:#333331;box-shadow:0 4px 12px #181f1c29}.evaluation-white{position:absolute;right:0;left:0;background:#f3f1e6;transition:height .28s ease,top .28s ease,bottom .28s ease}.evaluation-label{position:absolute;z-index:1;left:50%;color:#fff;font-size:.62rem;line-height:1;transform:translate(-50%);white-space:nowrap}.evaluation-label.on-white{color:#26322d}.board{position:relative;display:grid;grid-template-columns:repeat(8,1fr);width:100%;min-width:min(100%,320px);aspect-ratio:1;overflow:hidden;border:4px solid #20251f;border-radius:5px;background:#20251f;box-shadow:0 18px 34px #17212b24;touch-action:none}.board-arrows{position:absolute;z-index:4;top:0;right:0;bottom:0;left:0;width:100%;height:100%;overflow:visible;pointer-events:none}.board-arrow-line{stroke:#dc3f2fe6;stroke-linecap:round;stroke-width:.2}.board-arrow-head{fill:#dc3f2fe6}.board-circle{fill:none;stroke:#699654eb;stroke-width:.1}.board-arrow.draft{opacity:.7}.board-frame.paused .board{filter:blur(14px)}.board-frame.paused:after{position:absolute;z-index:7;top:8px;right:8px;bottom:8px;left:8px;display:grid;place-items:center;border-radius:4px;background:rgba(245,248,250,.86);color:#1f6f68;font-size:clamp(1.3rem,2.4vw,2rem);font-weight:900;content:"Paused";pointer-events:none}.completion-overlay{position:absolute;z-index:8;top:8px;right:8px;bottom:8px;left:8px;display:grid;place-items:center;padding:18px;border-radius:4px;background:rgba(17,25,35,.58);-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px)}.completion-card{display:grid;justify-items:center;width:min(86%,410px);padding:24px;border:1px solid rgba(216,224,230,.8);border-radius:8px;background:#ffffff;color:#17212b;text-align:center;box-shadow:0 22px 48px #00000038}.completion-icon{display:grid;width:58px;height:58px;place-items:center;margin-bottom:12px;border-radius:999px;background:#f2f8f7;font-size:2rem}.completion-card strong{margin-bottom:18px;font-size:clamp(1.25rem,2.2vw,1.65rem);line-height:1.12}.completion-card p{max-width:310px;margin:10px 0 18px;color:#61717f;font-weight:750}.completion-next-button{position:relative;display:grid;min-height:48px;width:min(100%,290px);overflow:hidden;place-items:center;border-radius:7px;background:#1f6f68;color:#fff;cursor:pointer;font-weight:900}.completion-next-button:hover,.completion-next-button:focus-visible{background:#175a55;outline:none}.completion-secondary-button{min-height:46px;width:min(100%,290px);border:1px solid #cbd6de;border-radius:8px;background:#ffffff;color:#263441;cursor:pointer;font-weight:900}.completion-secondary-button:hover,.completion-secondary-button:focus-visible{border-color:#1f6f68;background:#f2f8f7;outline:none}.completion-next-fill{position:absolute;bottom:0;left:0;height:6px;border-radius:0 999px 999px 0;background:#f0c14b;transition:width .1s linear}.completion-next-label{position:relative;z-index:1;display:inline-flex;align-items:baseline;justify-content:center;gap:7px;padding:0 14px;overflow-wrap:anywhere}.completion-next-label small{color:#ffffffd1;font-size:.76rem;font-weight:900}.solve-timer{display:grid;grid-template-columns:minmax(0,1fr) auto auto;gap:10px;align-items:center;width:min(100%,calc(100vh - 118px),800px);margin:0 auto}.solve-timer-track{height:13px;overflow:hidden;border-radius:999px;background:#d9e1e7}.solve-timer-track span{display:block;height:100%;border-radius:inherit;background:#43d157;transition:width .06s linear}.solve-timer.expired .solve-timer-track span{background:#c94d3e}.solve-timer.paused .solve-timer-track span{background:#d28622}.solve-timer.mistake .solve-timer-track{animation:wrong-move-timer-pulse .52s ease}.solve-timer small{min-width:36px;color:#657381;font-weight:900;text-align:right}.timer-pause-button{display:grid;width:30px;height:30px;min-width:30px;place-items:center;padding:0;border:1px solid #cbd6de;border-radius:6px;background:#ffffff;color:#263441;cursor:pointer;font-size:.82rem;font-weight:900;line-height:1;touch-action:manipulation}.timer-pause-button:hover,.timer-pause-button:focus-visible{border-color:#1f6f68;background:#f2f8f7;outline:none}.timer-pause-button:disabled{cursor:not-allowed;opacity:.52}@keyframes wrong-move-timer-pulse{0%,to{box-shadow:none}20%{box-shadow:0 0 0 4px #c94d3e29}}.square{position:relative;display:grid;place-items:center;aspect-ratio:1;color:#17212b;cursor:default;overflow:hidden;touch-action:none;user-select:none;-webkit-user-select:none;-webkit-tap-highlight-color:transparent}.square.light{background:#eeeed2}.square.dark{background:#769656}.square.selected{background:#f3f36f;cursor:grabbing;box-shadow:none}.square.mistake-square{z-index:4;background:#e78272;box-shadow:inset 0 0 0 clamp(3px,.45vmin,6px) #9a2d257a,0 0 0 clamp(2px,.3vmin,4px) #d84d4038;animation:wrong-square-flash .75s ease-out}.square.mistake-square .piece{animation:wrong-piece-shake .48s cubic-bezier(.36,.07,.19,.97)}.square.mistake-square .mistake-badge{position:absolute;z-index:5;top:7%;right:7%;display:grid;width:28%;min-width:18px;max-width:34px;aspect-ratio:1;place-items:center;border:2px solid rgba(255,255,255,.9);border-radius:999px;background:#c93f35;box-shadow:0 3px 8px #55181447;color:#fff;font-size:clamp(.85rem,2.2vmin,1.35rem);font-weight:900;line-height:1;pointer-events:none;animation:wrong-piece-badge .75s ease-out}@keyframes wrong-square-flash{0%{background:#f2b3a8;filter:saturate(1.2)}35%{background:#dc6859}to{background:#e78272;filter:none}}@keyframes wrong-piece-shake{0%,to{transform:translate(0)}18%{transform:translate(-7%)}36%{transform:translate(7%)}54%{transform:translate(-4%)}72%{transform:translate(4%)}}@keyframes wrong-piece-badge{0%{opacity:0;transform:scale(.4) rotate(-18deg)}24%{opacity:1;transform:scale(1.16) rotate(4deg)}55%{transform:scale(1) rotate(0)}to{opacity:.92;transform:scale(1) rotate(0)}}@media (prefers-reduced-motion: reduce){.square.mistake-square,.square.mistake-square .piece,.square.mistake-square .mistake-badge{animation:none}}.square.draggable{cursor:grab}.square.draggable:active,.square.dragging{cursor:grabbing}.square.last-move:after,.square.hint:after{position:absolute;top:0;right:0;bottom:0;left:0;border-radius:0;content:"";pointer-events:none}.square.legal-target:before{position:absolute;z-index:3;width:24%;aspect-ratio:1;border-radius:999px;background:rgba(28,47,37,.3);content:"";pointer-events:none}.square.legal-capture:before{width:78%;background:transparent;border:clamp(4px,.6vmin,8px) solid rgba(28,47,37,.3)}.square.last-move:after{background:rgba(186,202,68,.48)}.square.hint:after{z-index:2;top:0;right:0;bottom:0;left:0;box-sizing:border-box;border:clamp(4px,.7vmin,7px) solid rgba(201,77,62,.96);border-radius:0;background:rgba(201,77,62,.1);box-shadow:inset 0 0 0 1px #ffffff52}.piece{position:relative;z-index:1;display:grid;width:100%;height:100%;place-items:center;-webkit-user-select:none;user-select:none;pointer-events:none}.piece img{display:block;width:106%;height:106%;object-fit:contain;transform:translateY(-1px);filter:drop-shadow(0 3px 2px rgba(24,31,38,.22));-webkit-user-drag:none}.square.dragging .piece{opacity:.34}.drag-piece{position:fixed;top:0;left:0;z-index:1250;display:grid;width:clamp(48px,9vmin,96px);height:clamp(48px,9vmin,96px);place-items:center;pointer-events:none;transform-origin:center;translate:-50% -50%}.drag-piece img{display:block;width:112%;height:112%;object-fit:contain;filter:drop-shadow(0 10px 12px rgba(20,28,36,.32));-webkit-user-drag:none}.coordinate{position:absolute;z-index:2;font-size:clamp(.72rem,1.65vmin,1.05rem);font-weight:900;pointer-events:none}.square.light .coordinate{color:#4c7a31eb}.square.dark .coordinate{color:#edeecbeb}.file-label{right:6px;bottom:3px}.rank-label{top:2px;left:6px}.session-panel{display:grid;gap:12px;min-width:0}.session-topline{display:flex;align-items:center;justify-content:space-between;gap:10px}.trainer-inline-error{padding:8px 10px;border:1px solid #efb0a5;border-radius:6px;background:#fff7f5}.turn-card,.movesheet,.review-progress-card{border:1px solid #d8e0e6;border-radius:8px;background:#fbfcfd}.turn-card{min-height:150px;padding:16px}.book-view-panel .turn-card{min-height:0;padding:9px 12px}.book-view-grid,.book-view-panel,.book-view-panel .chapter-graph-panel,.book-view-panel .movesheet{overflow-anchor:none}.book-view-panel .turn-card-heading{display:grid;grid-template-columns:minmax(0,1fr) auto auto;align-items:center;margin-bottom:0}.book-view-panel .turn-label{margin-bottom:0}.training-turn-card.compact{min-height:0;padding:9px 12px}.training-turn-card.compact .turn-card-heading{display:grid;grid-template-columns:minmax(0,1fr) auto auto;align-items:center;margin-bottom:0}.training-turn-card .turn-card-heading .turn-label{margin-bottom:0}.analysis-stack-card{display:grid;grid-template-rows:auto minmax(0,1fr) auto;min-height:0;min-width:0;overflow:hidden;border:1px solid #d8e0e6;border-radius:8px;background:#fbfcfd}.engine-analysis-panel{position:relative;display:flex;min-height:86px;max-height:none;flex-direction:column;overflow:hidden;border:0;border-radius:0;background:transparent}.engine-analysis-panel.disabled{min-height:0;max-height:none}.engine-analysis-panel.disabled .engine-analysis-heading{border-bottom:0}.engine-analysis-panel.disabled .engine-lines-list,.engine-analysis-panel.disabled .engine-analysis-empty{display:none}.engine-analysis-heading{display:grid;grid-template-columns:auto auto minmax(0,1fr) auto;flex:0 0 auto;align-items:center;gap:10px;min-height:46px;padding:5px 10px;border-bottom:1px solid #dde5e9}.engine-toggle{position:relative;width:42px;height:24px;padding:0;border:0;border-radius:999px;background:#1f7b72;cursor:pointer}.engine-toggle:before{content:"✓";position:absolute;top:50%;left:8px;color:#fff;font-size:.72rem;font-weight:950;line-height:1;transform:translateY(-50%)}.engine-toggle span{position:absolute;top:3px;right:3px;width:18px;height:18px;border-radius:50%;background:#ffffff;transition:right .16s ease}.engine-analysis-panel.disabled .engine-toggle{background:#b8c2c9}.engine-analysis-panel.disabled .engine-toggle span{right:21px}.engine-analysis-panel.disabled .engine-toggle:before{display:none}.engine-main-evaluation{min-width:54px;color:#17222d;font-size:1.55rem;font-variant-numeric:tabular-nums;line-height:1}.engine-depth{color:#667786;font-size:.7rem;font-weight:800}.engine-settings-button{display:grid;width:26px;height:26px;place-items:center;padding:0;border:0;border-radius:4px;background:transparent;color:#526370;cursor:pointer;font-size:.95rem}.engine-settings-button:hover,.engine-settings-button:focus-visible{background:#e9f3f1;color:#1f6f68;outline:none}.engine-settings-row{display:flex;flex:0 0 auto;align-items:center;justify-content:space-between;gap:10px;padding:4px 10px 7px;border-top:1px solid #edf1f3;color:#526370;font-size:.7rem;font-weight:850}.engine-settings-row select{width:54px;min-height:28px;padding:2px 6px;border:1px solid #cbd6de;border-radius:5px;background:#ffffff;color:#263441;font-weight:850}.engine-lines-list{display:grid;gap:2px;min-height:0;margin:0;padding:3px 10px 12px;overflow:visible;list-style:none}.engine-lines-list li{display:grid;grid-template-columns:42px minmax(0,1fr);gap:8px;align-items:center;min-height:25px;border-bottom:1px solid #e3e9ed;color:#354654;font-size:.71rem}.engine-lines-list li:last-child{border-bottom:0}.engine-lines-list strong{color:#1f6f68;font-variant-numeric:tabular-nums}.engine-lines-list span{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.engine-analysis-empty{display:grid;min-height:0;flex:1 1 auto;place-items:center;padding:6px 10px 12px;color:#7d8b96;font-size:.72rem;font-weight:800}.analysis-stack-card .movesheet{min-height:0;max-height:none;overflow-y:auto;border:0;border-top:1px solid #d8e0e6;border-radius:0}.book-view-branch-chooser{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));border-top:1px solid #cfd9df;background:#f6f8f9}.book-view-branch-option{display:grid;min-width:0;min-height:48px;align-content:center;gap:2px;padding:6px 8px;border:0;border-right:1px solid #dbe2e7;border-bottom:1px solid #dbe2e7;border-radius:0;background:transparent;color:#34434f;cursor:pointer;text-align:left}.book-view-branch-option:nth-child(4n){border-right:0}.book-view-branch-option:nth-last-child(-n+4){border-bottom:0}.book-view-branch-option:hover,.book-view-branch-option:focus-visible{background:#eaf4f1}.book-view-branch-option.active{background:#dcefeb;color:#176d65;box-shadow:inset 0 -3px #218278}.book-view-branch-move{display:flex;min-width:0;align-items:baseline;gap:4px}.book-view-branch-move small{color:#7b8995;font-size:.65rem;font-weight:850}.book-view-branch-move strong{overflow:hidden;font-size:.82rem;text-overflow:ellipsis;white-space:nowrap}.book-view-branch-preview{overflow:hidden;color:#687986;font-size:.66rem;font-weight:750;text-overflow:ellipsis;white-space:nowrap}.turn-card-heading{display:flex;align-items:flex-start;justify-content:space-between;gap:10px;margin-bottom:14px}.turn-line-title{display:block;min-width:0;color:#263441;font-size:1rem;font-weight:900;overflow-wrap:anywhere}.turn-level-ribbon{display:inline-flex;min-height:28px;flex:0 0 auto;align-items:center;padding:0 10px;border-radius:999px;background:#e9f3f1;color:#1f6f68;font-size:.74rem;font-weight:950;white-space:nowrap}.turn-card.incorrect{border-color:#efb0a5;background:#fff7f5}.turn-card.incorrect h3{color:#a13c2f}.turn-card.complete{border-color:#9ed8c9;background:#f2fbf7}.turn-label{display:inline-flex;margin-bottom:12px;padding:4px 8px;border-radius:999px;background:#e8edf1;color:#4f5f6d;font-size:.74rem;font-weight:900}.turn-card p{margin-bottom:0;color:#61717f}.session-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}.control-row,.grade-row,.learn-complete-actions{display:grid;grid-template-columns:repeat(2,1fr);gap:8px}.grade-row{grid-template-columns:repeat(3,1fr)}.control-row button,.grade-row button,.learn-complete-actions button{border:1px solid #cbd6de;background:#ffffff}.control-row button:hover,.grade-row button:hover,.learn-complete-actions button:hover{border-color:#1f6f68;background:#f2f8f7}.grade-row .primary-button,.learn-complete-actions .primary-button{border-color:#1f6f68;background:#1f6f68}.movesheet{max-height:360px;overflow:auto;padding:0}.pgn-tree{display:block;scrollbar-gutter:stable}.pgn-tree-row{display:grid;position:relative;align-items:center;gap:2px 4px;min-height:38px;padding:6px 10px;border-bottom:1px solid #dfe5e9}.pgn-tree-row:last-child{border-bottom:0}.pgn-repertoire-status{grid-column:1 / -1;color:#39735c;font-size:.66rem;font-weight:900;letter-spacing:.02em;text-transform:uppercase}.pgn-tree-row.out-repertoire{background:#fff2f0}.pgn-tree-row.out-repertoire .pgn-repertoire-status,.pgn-tree-row.out-repertoire .pgn-move-token,.pgn-tree-row.out-repertoire .pgn-move-number{color:#b53c32}.pgn-mainline-row{grid-template-columns:34px minmax(0,1fr) minmax(0,1fr);background:#fbfcfd}.pgn-row-number{color:#7b8995;font-size:.78rem;font-variant-numeric:tabular-nums;font-weight:850;text-align:center}.pgn-mainline-row .pgn-move-token{width:100%;justify-content:flex-start}.pgn-variation-row{display:flex;flex-wrap:wrap;min-height:30px;margin-left:10px;gap:0 2px;padding:2px 6px 2px 18px;background:#f6f8f9;color:#4f5d68}.pgn-variation-row:before{content:"";position:absolute;top:-1px;bottom:50%;left:5px;width:8px;border-bottom:1px solid #a8b3bb;border-left:1px solid #a8b3bb}.pgn-variation-row .pgn-move-token{min-height:26px;padding:2px 4px;font-size:.8rem}.pgn-variation-row .pgn-move-number{font-size:.69rem}.pgn-move-token{display:inline-flex;align-items:baseline;gap:3px;min-width:0;min-height:30px;padding:4px 6px;border:0;border-radius:5px;background:transparent;color:#2f3d49;cursor:pointer;font:inherit;font-size:.86rem;font-weight:800;letter-spacing:0}.pgn-move-token:hover,.pgn-move-token:focus-visible{background:#e5edeb;color:#1f6f68;outline:none}.pgn-move-number{color:#7b8995;font-size:.74rem;font-variant-numeric:tabular-nums}.pgn-move-token.played{color:#1f6f68}.pgn-move-token.current{background:#f4dfbd;color:#5e3500}.training-copy-actions{display:grid;gap:8px;margin-top:auto}.training-copy-actions .line-review-button{min-height:44px;width:100%}.chapter-graph-panel{--chapter-graph-height: clamp(180px, 21.5dvh, 230px);display:grid;gap:10px;min-width:0;padding-top:4px}.chapter-graph-heading{display:flex;align-items:end;justify-content:space-between;gap:12px}.chapter-graph-heading div{display:grid;gap:2px}.chapter-graph-heading span,.chapter-graph-heading small{color:#647482;font-size:.72rem;font-weight:850}.chapter-graph-heading strong{color:#263441;font-size:.96rem}.chapter-graph-state{display:grid;height:var(--chapter-graph-height);min-height:var(--chapter-graph-height);place-items:center;border:1px solid #d8e0e6;border-radius:8px;background:#ffffff;color:#647482;font-size:.82rem;font-weight:800;text-align:center}.chapter-graph-state.error{border-color:#efb0a5;background:#fff7f5;color:#a13c2f}.chapter-graph-canvas{width:100%;height:var(--chapter-graph-height);overflow:hidden;border:1px solid #d8e0e6;border-radius:8px;background:#ffffff}.chapter-graph-canvas .vue-flow__pane{cursor:grab}.chapter-graph-canvas .vue-flow__pane:active{cursor:grabbing}.chapter-graph-canvas .vue-flow__node-position{width:18px;height:18px;border:0;border-radius:50%;background:transparent;box-shadow:none}.chapter-position-node{display:block;width:18px;height:18px;padding:0;border:2px solid #7c918d;border-radius:50%;background:#dce9e6;cursor:pointer}.chapter-position-node-wrap{position:relative;width:18px;height:18px}.chapter-position-expand{position:absolute;top:50%;right:-6px;z-index:8;display:grid;width:12px;height:12px;padding:0;place-items:center;border:1px solid #ffffff;border-radius:50%;background:#ffffff;color:#1f6f68;box-shadow:0 1px 3px #16222a38;cursor:pointer;font-size:10px;font-weight:900;line-height:1;transform:translateY(-50%)}.chapter-position-expand:hover,.chapter-position-expand:focus-visible{border-color:#1f6f68;background:#edf7f5;outline:none}.chapter-graph-canvas .vue-flow__handle-right.has-expand-control{opacity:0}.chapter-graph-canvas .vue-flow__node.expanded-position .chapter-position-expand{background:#1f6f68;color:#fff}.chapter-graph-canvas .vue-flow__node.active-position .chapter-position-node{border-color:#dc8b16;background:#f4bd4f;box-shadow:0 0 0 4px #dc8b1638}.chapter-graph-canvas .vue-flow__node.next-position .chapter-position-node{border-color:#1f6f68;background:#72beb2;box-shadow:0 0 0 3px #1f6f6829}.chapter-graph-canvas .vue-flow__node.transposition-position .chapter-position-node{outline:2px solid #8f6fa8;outline-offset:2px}.chapter-graph-canvas .vue-flow__edge-path{stroke:#7e909e;stroke-width:1.6}.chapter-graph-canvas .vue-flow__edge-text{fill:#263441;font-size:10px;font-weight:850}.chapter-graph-canvas .vue-flow__edge.selected-continuation-edge .vue-flow__edge-text{fill:#172431;font-weight:950}.chapter-graph-canvas .vue-flow__edge-textbg{fill:#fff;fill-opacity:.94}.chapter-graph-overlay-control{font-size:17px;font-weight:700;line-height:1}.chapter-graph-bulk-control{font-size:16px;font-weight:800;line-height:1}.chapter-graph-canvas .vue-flow__controls-button:disabled{cursor:default;opacity:.38}.chapter-graph-overlay{z-index:1500;overflow:hidden}.chapter-graph-overlay-panel{display:grid;grid-template-rows:auto minmax(0,1fr);width:min(1500px,96vw);height:min(920px,92vh);overflow:hidden;border:1px solid #cbd6de;border-radius:8px;background:#f7fafb;box-shadow:0 24px 70px #101b2447}.chapter-graph-overlay-heading{display:flex;align-items:center;justify-content:space-between;gap:18px;padding:16px 18px;border-bottom:1px solid #d8e0e6;background:#ffffff}.chapter-graph-overlay-heading div{display:grid;gap:2px}.chapter-graph-overlay-heading span,.chapter-graph-overlay-heading small{color:#647482;font-size:.76rem;font-weight:850}.chapter-graph-overlay-heading h2{margin:0;font-size:1.3rem}.chapter-graph-overlay-canvas{height:100%;border:0;border-radius:0}.chapter-graph-overlay-state{display:grid;min-height:0;place-items:center;color:#647482;font-weight:850}.chapter-graph-overlay-state.error{color:#a13c2f}.review-progress-card{display:grid;min-height:220px;align-content:center;justify-items:center;gap:8px;padding:22px;overflow:hidden;text-align:center}.review-progress-number{position:relative;display:grid;min-width:76px;height:76px;place-items:center;padding:0 14px;border-radius:999px;background:#1f6f68;color:#fff;font-size:2.1rem;font-weight:950;font-variant-numeric:tabular-nums;box-shadow:0 14px 26px #1f6f6838}.review-progress-number:before,.review-progress-number:after{position:absolute;width:12px;height:12px;border-radius:999px;background:#f0a52a;content:"";opacity:0;pointer-events:none}.review-progress-number:before{top:8px;right:3px;box-shadow:-68px 14px #47d16c,-24px -16px #f6d04d}.review-progress-number:after{bottom:8px;left:4px;box-shadow:68px -14px #47d16c,26px 17px #f6d04d}.review-progress-card strong{color:#17212b;font-size:1.45rem;line-height:1.12}.review-progress-card small{max-width:210px;color:#647482;font-size:.8rem;font-weight:850}.review-progress-card.feedback-warning small{color:#8a5a0a}.review-progress-card.feedback-error small{color:#a13c2f}.review-progress-card.rewarded{animation:review-card-reward .52s ease-out}.review-progress-card.rewarded .review-progress-number{animation:review-number-reward .7s cubic-bezier(.18,.89,.32,1.28)}.review-progress-card.rewarded .review-progress-number:before,.review-progress-card.rewarded .review-progress-number:after{animation:review-spark-pop .7s ease-out}.review-progress-card.rewarded small{animation:review-message-pop .52s ease-out}@keyframes review-card-reward{0%{border-color:#d8e0e6;background:#fbfcfd}35%{border-color:#8fd8b3;background:#f1fbf5}to{border-color:#d8e0e6;background:#fbfcfd}}@keyframes review-number-reward{0%{transform:scale(1);background:#1f6f68}20%{transform:translateY(-6px) scale(1.24) rotate(-3deg);background:#d28622;box-shadow:0 20px 36px #d2862259,0 0 0 8px #d2862224}48%{transform:translateY(3px) scale(.94) rotate(2deg)}72%{transform:translateY(-2px) scale(1.08);background:#35a66a}to{transform:translateY(0) scale(1);background:#1f6f68}}@keyframes review-spark-pop{0%{opacity:0;transform:scale(.3)}18%{opacity:1;transform:scale(1.15)}to{opacity:0;transform:scale(1.9)}}@keyframes review-message-pop{0%{transform:translateY(4px) scale(.98);opacity:.65}45%{transform:translateY(-2px) scale(1.06);opacity:1}to{transform:translateY(0) scale(1);opacity:1}}@media (max-width: 1120px){.learn-workspace{grid-template-columns:1fr}.learn-queue-panel{max-height:none;order:2}.training-grid{grid-template-columns:minmax(0,1fr)}.board-frame,.solve-timer{width:min(100%,82vmin,660px)}.session-panel{grid-template-columns:minmax(0,1fr) minmax(280px,.9fr);align-items:start}.turn-card,.session-stats,.control-row,.learn-complete-actions{grid-column:1}.movesheet,.review-progress-card{grid-column:2;grid-row:1 / span 4;max-height:430px}}@media (max-width: 860px){.app-shell{padding:0 14px 14px}.menu-bar{grid-template-columns:minmax(0,1fr) auto;justify-items:stretch;gap:8px 12px;min-height:60px;margin-right:calc(50% - 50vw);margin-left:calc(50% - 50vw);margin-bottom:16px;padding:8px 14px}.menu-bar:has(.menu-auth-link){grid-template-columns:minmax(0,1fr) auto}.brand-mark{justify-content:flex-start}.brand-mark img{width:38px;height:38px}.menu-actions{justify-content:flex-end;flex-wrap:nowrap}.menu-page-title{grid-column:1 / -1;justify-content:center}.landing-page{grid-template-columns:1fr;align-items:start;padding:18px;min-height:auto}.landing-conversion-panel{gap:18px}.auth-page{min-height:calc(100vh - 76px);padding:18px 14px 36px}.auth-page-shell{gap:16px}.auth-page-heading h1{font-size:clamp(2rem,10vw,2.75rem)}.auth-panel{gap:17px;padding:22px 18px}.landing-copy{gap:14px}.landing-copy h1{font-size:clamp(2.25rem,11vw,3.35rem)}.landing-board-preview{width:min(100%,360px);border-width:6px}.landing-move-card,.landing-review-card{right:10px;min-height:32px;padding:6px 10px;font-size:.78rem}.landing-move-card{bottom:50px}.landing-review-card{bottom:10px}.landing-how{margin-top:4px;padding-top:14px}.landing-steps{grid-template-columns:1fr}.books-toolbar{align-items:stretch;flex-direction:column}.chapter-page-hero{grid-template-columns:82px minmax(0,1fr);gap:16px;padding:14px 0 10px}.chapter-page-logo{width:82px;height:82px}.chapter-title-form{grid-template-columns:1fr;width:100%}.book-home-actions,.book-page-layout{grid-template-columns:1fr}.repertoire-sidebar{position:static}.book-form{grid-template-columns:1fr;max-width:none}.book-interval-grid{grid-template-columns:repeat(auto-fit,minmax(150px,1fr))}.auth-session{justify-self:stretch}.topbar{align-items:stretch;flex-direction:column}.stat-strip{min-width:0}.training-grid{grid-template-columns:1fr}.board-frame{width:min(100%,calc(100vw - 68px),660px)}.board{min-width:0;border-width:4px}.solve-timer{width:min(100%,calc(100vw - 68px),660px)}.session-panel{grid-template-columns:1fr}.chapter-graph-canvas{height:220px}.chapter-graph-state{height:220px;min-height:220px}.movesheet,.review-progress-card,.turn-card,.session-stats,.control-row,.learn-complete-actions{grid-column:auto;grid-row:auto}.movesheet{max-height:260px}.review-progress-card{min-height:150px}.training-book-card{grid-template-columns:52px minmax(0,1fr)}.training-book-card img{width:52px;height:52px}.book-card,.chapter-card,.book-action-card{min-height:auto}}@media (max-width: 540px){.app-shell{padding-right:10px;padding-left:10px}.menu-bar{grid-template-columns:auto minmax(0,1fr);gap:8px;min-height:50px;margin-bottom:12px;padding:7px 10px}.brand-mark{gap:0}.brand-mark img{width:34px;height:34px}.brand-mark span,.menu-page-title{display:none}.menu-actions{align-items:center;justify-content:flex-end;gap:6px;min-width:0}.menu-auth-link,.menu-actions button,.user-chip{min-height:36px;font-size:.76rem}.menu-auth-link{padding-right:9px;padding-left:9px}.menu-auth-signin{min-width:76px}.user-chip{width:36px;max-width:36px;padding:0;justify-content:center}.user-chip span{width:28px;min-width:28px;max-width:28px;height:28px;min-height:28px;max-height:28px;flex-basis:28px}.user-chip strong{display:none}.training-action-button{flex:0 1 auto;flex-direction:row;gap:3px;max-width:min(110px,calc((100vw - 98px)/2));padding:0 10px;line-height:1;overflow:hidden}.training-action-button small{font-size:inherit}.profile-menu{position:fixed;top:56px;right:10px;left:10px;width:auto}.profile-menu:before{right:44px}.auth-form{grid-template-columns:1fr}.auth-session{grid-template-columns:auto minmax(0,1fr)}.auth-session button{grid-column:1 / -1}.book-control-panel,.books-empty{padding:16px}.chapter-page-hero{grid-template-columns:58px minmax(0,1fr);gap:12px;align-items:start}.chapter-page-logo{width:58px;height:58px}.chapter-page-title h2{margin-bottom:8px;font-size:1.65rem}.chapter-breadcrumb{gap:8px;font-size:1rem}.chapter-breadcrumb>span{border-top-width:6px;border-bottom-width:6px;border-left-width:6px}.chapter-line-heading,.chapter-line-moves{padding-right:14px;padding-left:14px}.chapter-line-heading{align-items:stretch;flex-direction:column;gap:12px;padding-top:16px;padding-bottom:16px}.chapter-line-actions{justify-content:space-between}.chapter-line-box,.line-review-button{min-height:36px}.line-review-button{flex:1}.book-form-actions{flex-direction:column}.book-form-actions button{width:100%}.book-interval-summary{grid-template-columns:1fr}.book-interval-toggle{width:100%}.book-card dl div{grid-template-columns:1fr;gap:2px}.chapter-card dl{grid-template-columns:repeat(3,minmax(0,1fr))}.chapter-card dl div{min-height:62px;padding:8px}.chapter-card dd{font-size:1.15rem}.stat-strip,.session-stats{grid-template-columns:repeat(2,1fr)}.trainer-header{align-items:stretch;flex-direction:column}.learn-header-actions{display:grid;grid-template-columns:minmax(0,1fr) auto}.box-badge{min-width:0;text-align:left}.learn-workspace{gap:12px}.learn-queue-panel,.trainer-panel{padding:12px}.board-frame{width:min(100%,calc(100vw - 44px))}.board{border-width:4px;border-radius:7px}.solve-timer{width:min(100%,calc(100vw - 44px))}.square.selected{box-shadow:none}.square.hint:after{border-width:4px}.piece img{width:106%;height:106%}.coordinate{font-size:.66rem}}@media (max-width: 380px){.training-action-button span{font-size:.72rem}.training-action-button small{font-size:.64rem}.chapter-card dl,.learn-header-actions{grid-template-columns:1fr}.board-frame{width:min(100%,calc(100vw - 36px))}}
