/* Task-first layout, implemented from the generated 2026-11-03 reference.
   Palette, typography, native chessboard and business rules are preserved. */
.task-home { display: grid; gap: 28px; }
.daily-task { display: grid; grid-template-columns: 1fr 1fr; padding: 0; overflow: hidden; box-shadow: none; min-height: 290px; }
.daily-task-copy { padding: 30px 34px; position: relative; z-index: 1; }
.daily-task h2 { font-size: 30px; margin: 0 0 24px; }
.daily-task .pill-group { width: fit-content; margin-bottom: 24px; gap: 8px; }
.daily-task .pill-group button { min-width: 78px; min-height: 44px; font-size: 15px; }
.daily-task .button-row { margin: 0 0 18px; gap: 18px; }
.daily-task .primary { min-height: 48px; }
.daily-task .text-link, .recent-game-link { display: inline-flex; gap: 8px; align-items: center; min-height: 44px; }
.daily-task-art { width: 100%; height: 100%; min-height: 290px; object-fit: cover; object-position: center; }
.task-pair { display: grid; grid-template-columns: 1.15fr 1fr; border-block: 1px solid var(--c-divider); }
.task-pair > section { padding: 24px 0; }
.task-pair > section + section { padding-left: 32px; margin-left: 32px; border-left: 1px solid var(--c-divider); }
.task-section { min-width: 0; padding: 26px 0; }
.task-section h2 { font-family: var(--f-display); font-size: 24px; font-weight: 600; line-height: 1.5; margin: 0 0 16px; letter-spacing: 0; }
.task-section .button-row { margin-top: 0; }
.theme-section { padding: 0; }
.theme-links { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); }
.theme-link { display: flex; justify-content: space-between; align-items: center; min-height: 54px; padding: 12px 18px; background: transparent; color: var(--c-text); border: 0; border-bottom: 1px solid var(--c-divider); font: inherit; font-weight: 500; cursor: pointer; gap: 12px; }
.theme-link + .theme-link { border-left: 1px solid var(--c-divider); }
.theme-link:hover, .principle-open:hover { background: var(--c-selected); color: var(--c-accent); }
.theme-link svg, .principle-open svg { width: 18px; height: 18px; flex: 0 0 18px; }
.play-tasks { max-width: 900px; }
.play-tasks > .task-section { border-bottom: 1px solid var(--c-divider); }
.match-task { padding-top: 0; }
.level-choice { display: flex; gap: 24px; align-items: center; margin-bottom: 18px; color: var(--c-secondary); flex-wrap: wrap; }
.task-disclosure { border-top: 1px solid var(--c-divider); margin-top: 12px; color: var(--c-text); }
.task-disclosure > summary { cursor: pointer; min-height: 48px; padding: 12px 0; font-size: 16px; font-weight: 600; line-height: 1.6; }
.task-disclosure > summary:focus-visible { outline: 2px solid var(--c-accent); outline-offset: 4px; }
.disclosure-content { padding: 12px 0 24px; }
.training-tools { display: flex; align-items: flex-start; flex-wrap: wrap; gap: 12px 24px; margin: 8px 0 24px; }
.training-tools > .text-link { display: flex; align-items: center; gap: 8px; min-height: 44px; }
.practice-modes { border: 0; margin: 0 0 0 auto; }
.practice-modes > summary { padding-top: 8px; }
.practice-modes .button-row { margin: 0; }
.training-tabs { margin-top: 18px; }
.exercise-list, .personal-list { gap: 0; }
.exercise-list .portal-row, .personal-list .portal-row, .wrong-book .portal-row { background: transparent; box-shadow: none; border: 0; border-bottom: 1px solid var(--c-divider); border-radius: 0; padding: 20px 0; }
.exercise-list .row-info p { max-width: 60ch; }
.exercise-list .row-tag { flex-shrink: 0; }
.task-search { max-width: 640px; margin-bottom: 24px; }
.principle-groups { display: grid; grid-template-columns: 1fr 1fr; gap: 12px 48px; }
.principle-groups > section { border-top: 1px solid var(--c-divider); }
.principle-groups > section:first-child { grid-column: 1 / -1; }
.principle-groups > section:first-child .principle-index { display: grid; grid-template-columns: 1fr 1fr; gap: 0 48px; }
.principle-index .topic-card { background: transparent; border: 0; border-radius: 0; padding: 0; box-shadow: none; }
.principle-index h3 { margin: 0; font-family: var(--ui); font-size: 16px; font-weight: 500; }
.principle-open { display: flex; justify-content: space-between; align-items: center; gap: 16px; width: 100%; min-height: 48px; padding: 12px 8px; font: inherit; text-align: left; background: transparent; color: var(--c-text); border: 0; border-bottom: 1px solid var(--c-divider); cursor: pointer; }
.record-summary { display: flex; gap: 16px 40px; flex-wrap: wrap; color: var(--c-secondary); padding: 0 0 24px; border-bottom: 1px solid var(--c-divider); font-size: 15px; font-variant-numeric: tabular-nums; }
.record-summary b { color: var(--c-text); }
.wrong-book { padding-bottom: 18px; }
.wrong-book:has(.portal-row) { padding-bottom: 30px; }
.section-actions { display: flex; align-items: center; justify-content: space-between; gap: 20px; margin-bottom: 14px; }
.section-actions h2 { margin: 0; }
.goal-section { border-top: 1px solid var(--c-divider); }
.goal-section .portal-row { background: transparent; box-shadow: none; border: 0; border-bottom: 1px solid var(--c-divider); border-radius: 0; }
.record-chart-grid { display: grid; grid-template-columns: 1.5fr 1fr; gap: 32px; }
.learning-statistics .surface { background: transparent; border: 0; border-radius: 0; box-shadow: none; padding: 24px 0; }
.learning-statistics .rate-figure { border-block: 1px solid var(--c-divider); }
.learning-statistics .weakest-panel .weak-topic-row { background: transparent; }
.workshop-tools { margin: -4px 0 16px; }
.workshop-row .workshop-actions { align-items: flex-start; }
.item-actions { border: 0; margin: 0; min-width: 100px; }
.item-actions summary { font-size: 14px; padding: 8px 0; min-height: 44px; }
.item-actions .button-row { max-width: 330px; margin: 0; }
.library-task-toolbar { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; margin-bottom: 20px; }
.library-search { display: flex; flex: 1 1 240px; align-items: center; gap: 10px; margin-left: auto; max-width: 520px; }
.library-filter-panel { margin-bottom: 24px; }
.library-filter-panel .library-filters { padding: 0; }
.library-filter-panel .library-filter-actions { margin-top: 16px; }
.library-filter-panel .field-note { margin-bottom: 0; }
.library-filter-panel .disclosure-content { padding-bottom: 12px; }
@media (max-width: 1100px) {
  .daily-task { grid-template-columns: 1.15fr 0.85fr; }
  .daily-task-copy { padding: 28px; }
  .daily-task .button-row { gap: 8px 16px; }
  .task-pair { grid-template-columns: 1fr 1fr; }
  .task-pair > section + section { margin-left: 24px; padding-left: 24px; }
  .theme-link { padding-inline: 12px; }
}
@media (max-width: 767px) {
  .daily-task { grid-template-columns: 1fr; min-height: auto; }
  .daily-task-copy { padding: 24px; }
  .daily-task-art { display: none; }
  .daily-task h2 { font-size: 26px; margin-bottom: 20px; }
  .daily-task .pill-group button { min-width: 66px; }
  .daily-task .button-row { align-items: center; }
  .task-home { gap: 24px; }
  .task-pair { grid-template-columns: 1fr; }
  .task-pair > section { padding: 20px 0; }
  .task-pair > section + section { margin-left: 0; padding: 20px 0; border-left: 0; border-top: 1px solid var(--c-divider); }
  .task-section h2 { font-size: 22px; }
  .theme-links { grid-template-columns: 1fr; }
  .theme-link { padding-inline: 8px; }
  .theme-link + .theme-link { border-left: 0; }
  .training-tools { gap: 10px 20px; }
  .practice-modes { margin-left: 0; width: 100%; }
  .principle-groups { grid-template-columns: 1fr; gap: 0; }
  .principle-groups > section:first-child .principle-index { grid-template-columns: 1fr; }
  .record-summary { gap: 10px 20px; font-size: 14px; }
  .record-chart-grid { grid-template-columns: 1fr; gap: 0; }
  .learning-statistics .learning-evidence-grid { grid-template-columns: 1fr; }
  .workshop-row { align-items: flex-start; }
  .workshop-row .workshop-actions { width: 100%; }
  .item-actions { flex: 1; }
  .library-search { order: 2; flex-basis: 100%; margin-left: 0; max-width: none; }
}
@media (prefers-reduced-motion: reduce) {
  .theme-link, .principle-open { transition: none; }
}

/* Open task groups use the same controls without requiring a card wrapper. */
.task-section .button-row, .workshop-tools, .disclosure-content.button-row, .disclosure-content > .button-row { display:flex; flex-wrap:wrap; align-items:center; gap:10px; }

.local-archive-notice{display:flex;justify-content:space-between;align-items:center;gap:16px;margin-bottom:20px}.local-archive-notice[hidden]{display:none}.local-archive-notice p{margin:0;color:var(--c-error)}.local-archive-notice .button-row{display:flex;flex-wrap:wrap;gap:8px;margin:0}
@media(max-width:767px){.local-archive-notice{align-items:flex-start;flex-direction:column}}
/* Learning dialog anatomy from the generated principle-example reference.
   Real boards remain code-native, with the same stable-piece motion contract. */
.platform-dialog[data-kind="principle-lesson"] { width:min(900px,calc(100vw - 32px)); }
.platform-dialog[data-kind="principle-lesson"]>.dialog-intro { max-width:68ch; margin:0 0 24px; }
.principle-lesson { display:grid; grid-template-columns:minmax(0,1.2fr) minmax(250px,.9fr); gap:28px; align-items:start; }
.lesson-diagram { min-width:0; }
.lesson-board { width:100%; max-width:390px; margin:0 auto 16px; }
.lesson-board>.lesson-marks { z-index:2; pointer-events:none; }
.lesson-board .variation-pieces { z-index:3; }
.lesson-board .lesson-move-arrow { stroke:var(--c-accent); stroke-width:5; stroke-linecap:round; opacity:.9; }
.lesson-board .lesson-destination { stroke:var(--c-accent); stroke-width:4; fill:none; opacity:.8; }
.lesson-board .lesson-mark { stroke:var(--c-accent); stroke-width:4; fill:none; opacity:.9; }
.lesson-board .lesson-mark.blocker { stroke:var(--c-red); stroke-dasharray:5 3; }
.lesson-step-controls { display:grid; grid-template-columns:auto auto minmax(45px,1fr) auto auto; gap:6px; align-items:center; }
.lesson-step-controls button { min-height:44px; padding:8px 9px; border:1px solid var(--c-outline); background:transparent; color:var(--c-accent); border-radius:8px; font:inherit; font-size:13px; cursor:pointer; }
.lesson-step-controls button:disabled { color:var(--c-muted); opacity:.55; cursor:default; }
.lesson-step-controls span { text-align:center; font-variant-numeric:tabular-nums; font-size:14px; color:var(--c-secondary); }
.lesson-notation { margin:12px 0 0; line-height:1.8; overflow-wrap:anywhere; }
.lesson-content h3 { font-family:var(--f-display); font-size:22px; line-height:1.5; margin:0 0 12px; color:var(--c-text); }
.lesson-explanation p { line-height:1.8; color:var(--c-secondary); margin:0 0 16px; font-size:15px; }
.lesson-search { margin-bottom:20px; }
.lesson-search .field-note { margin-bottom:0; }
.lesson-search-status { margin:8px 0 0; color:var(--c-secondary); overflow-wrap:anywhere; }
.lesson-evidence { padding-bottom:18px; border-bottom:1px solid var(--c-divider); margin:10px 0 20px; }
.lesson-evidence>summary { min-height:44px; padding:10px 0; cursor:pointer; color:var(--c-accent); font-size:14px; }
.lesson-evidence dl { display:grid; grid-template-columns:60px minmax(0,1fr); gap:10px; font-size:13px; margin:16px 0; color:var(--c-secondary); }
.lesson-evidence dt { font-weight:600; color:var(--c-text); }
.lesson-evidence dd { margin:0; overflow-wrap:anywhere; }
.lesson-facts { list-style:none; padding:0; margin:0; max-height:300px; overflow:auto; }
.lesson-facts li { padding:10px 0; display:flex; flex-direction:column; gap:6px; border-bottom:1px solid var(--c-divider); font-size:12px; color:var(--c-secondary); }
.lesson-facts code { display:block; overflow-wrap:anywhere; white-space:pre-wrap; font-size:12px; color:var(--c-secondary); }
.lesson-primary>.primary { width:100%; min-height:48px; margin:0 0 12px; }
.lesson-primary>.text-link { display:block; min-height:44px; margin:0 auto; }
.lesson-related { border-top:1px solid var(--c-divider); margin-top:24px; padding-top:20px; }
.lesson-related h3 { font-size:20px; }
.lesson-exercise { display:flex; justify-content:space-between; align-items:center; width:100%; gap:16px; border:0; border-bottom:1px solid var(--c-divider); background:transparent; color:var(--c-accent); min-height:48px; font:inherit; text-align:left; padding:12px 0; font-size:14px; cursor:pointer; }
.lesson-exercise svg { width:18px; height:18px; flex:0 0 18px; }
.lesson-exercise:hover { color:var(--c-accent-hover); background:var(--c-selected); }
@media(max-width:700px) {
 .platform-dialog[data-kind="principle-lesson"] { width:calc(100vw - 24px); padding:20px; }
 .principle-lesson { grid-template-columns:1fr; gap:24px; }
 .lesson-content h3 { font-size:20px; }
 .lesson-step-controls { gap:5px; }
 .lesson-step-controls button { padding-inline:7px; font-size:12px; }
 .lesson-board { max-width:350px; }
}

.term-link{display:inline;background:transparent;border:0;border-bottom:1px dotted currentColor;border-radius:0;color:var(--c-accent);font:inherit;padding:0 2px;cursor:pointer;line-height:inherit}.term-link:hover{background:var(--c-selected)}

.lesson-step-controls.replay-controls{padding:0;background:transparent;border:0;border-radius:0;display:grid;grid-template-columns:54px 68px minmax(45px,1fr) 68px 54px;gap:6px}.lesson-step-controls.replay-controls button{width:auto;min-width:0;min-height:44px;white-space:nowrap;font-size:13px;padding:8px 6px}.lesson-step-controls.replay-controls span{font-size:14px}
@media(max-width:420px){.lesson-step-controls.replay-controls{grid-template-columns:42px 56px minmax(32px,1fr) 56px 42px;gap:4px}.lesson-step-controls.replay-controls button{font-size:12px;padding-inline:3px}}

/* Interactive variation sandbox follows the generated branch-practice comp. */
.platform-dialog[data-kind="variation-sandbox"]{width:min(900px,calc(100vw - 32px))}.sandbox-layout{display:grid;grid-template-columns:minmax(0,1.2fr) minmax(230px,.9fr);gap:28px;align-items:start}.sandbox-diagram{min-width:0}.sandbox-board{max-width:390px;width:100%;margin:0 auto 18px}.sandbox-marks{z-index:2;pointer-events:none;color:var(--c-accent)}.sandbox-marks circle{fill:var(--c-accent);opacity:.8}.sandbox-board .variation-pieces{z-index:3}.sandbox-hitgrid{position:absolute;inset:0;z-index:4;pointer-events:none}.sandbox-playing .sandbox-hitgrid{pointer-events:auto}.sandbox-hitgrid button{position:absolute;width:11.11%;height:10%;transform:translate(-50%,-50%);border:0;border-radius:0;background:transparent;min-height:0;padding:0;cursor:pointer}.sandbox-hitgrid button[aria-selected="true"]{outline:2px solid var(--c-accent);outline-offset:-6px;border-radius:50%}.sandbox-hitgrid button:focus-visible{outline:3px solid var(--c-accent);outline-offset:-5px}.sandbox-line-controls.replay-controls{display:grid;grid-template-columns:48px 64px minmax(80px,1fr) 64px 48px;gap:6px;padding:0;background:transparent;border:0;border-radius:0}.sandbox-line-controls.replay-controls button{width:auto;min-height:44px;border:1px solid var(--c-outline);background:transparent;color:var(--c-accent);border-radius:8px;font:inherit;font-size:13px;white-space:nowrap;padding:8px 6px;cursor:pointer}.sandbox-line-controls.replay-controls span{font-size:14px;line-height:1.5;text-align:center}.sandbox-line-controls.replay-controls button:disabled{opacity:.5;color:var(--c-muted);cursor:default}.sandbox-tools .pill-group{display:flex;gap:6px;width:100%;margin:0 0 20px}.sandbox-tools .pill-group button{min-height:44px;flex:1;font-size:14px}.sandbox-status{margin:0 0 16px;color:var(--c-secondary);font-size:15px;line-height:1.8}.sandbox-branch-history{max-height:250px;overflow:auto;min-height:0;margin-bottom:20px;color:var(--c-secondary);font-size:14px}.sandbox-branch-history p{border-bottom:1px solid var(--c-divider);margin:0;padding:10px 0;line-height:1.8}.sandbox-actions{display:grid;gap:12px;border-top:1px solid var(--c-divider);padding-top:20px}.sandbox-actions button{min-height:44px;width:100%}.sandbox-board .variation-piece.sandbox-selected{outline:3px solid var(--c-accent);outline-offset:3px}#variationLine{overflow-wrap:anywhere}
@media(max-width:700px){.platform-dialog[data-kind="variation-sandbox"]{width:calc(100vw - 24px);padding:20px}.sandbox-layout{grid-template-columns:1fr;gap:20px}.sandbox-tools{grid-row:1}.sandbox-branch-history{max-height:160px}.sandbox-board{max-width:350px}.sandbox-line-controls.replay-controls{grid-template-columns:38px 54px minmax(70px,1fr) 54px 38px;gap:4px}.sandbox-line-controls.replay-controls button{font-size:12px;padding-inline:3px}.sandbox-actions{display:flex;flex-wrap:wrap}.sandbox-actions button{flex:1;min-width:120px}}

.sandbox-actions[hidden]{display:none}

/* Compact native format chooser; generated porcelain import/export reference. */
.pgn-export-options{border:0;margin:0 0 20px;padding:0;display:grid;gap:0}.pgn-export-options label{display:flex;align-items:flex-start;gap:14px;margin:0;padding:18px 0;border-bottom:1px solid var(--c-divider);cursor:pointer}.pgn-export-options input[type="radio"]{width:18px;height:18px;min-height:18px;padding:0;margin:5px 0 0;accent-color:var(--c-accent)}.pgn-export-options strong{display:block;font-weight:600;color:var(--c-text);font-size:16px}.pgn-export-options small{display:block;color:var(--c-secondary);font-size:13px;line-height:1.8;margin-top:4px}.pgn-import-tabs{display:flex;margin-bottom:20px;gap:6px}.pgn-import-tabs button{flex:1;min-height:44px}.pgn-file-input[hidden],.pgn-text-input[hidden]{display:none}.pgn-file-picker{display:block;padding:20px;border:1px solid var(--c-outline);border-radius:10px;margin-bottom:14px;font-size:15px}.pgn-file-picker input[type="file"]{margin-top:14px;width:100%;border:0;background:transparent;color:var(--c-secondary);font:inherit;font-size:13px;padding:0;min-height:44px}.pgn-file-picker input::file-selector-button{font:inherit;padding:10px;border:1px solid var(--c-outline);border-radius:8px;background:var(--c-surface);color:var(--c-accent);margin-right:8px;cursor:pointer}.pgn-file-name{overflow-wrap:anywhere;color:var(--c-secondary);font-size:13px}.platform-dialog[data-kind="pgn-import"] textarea{min-height:160px}.platform-dialog[data-kind="pgn-import"] details label{margin-top:14px}

/* App shell: no accidental text highlight while dragging pieces, no native image drag ghost. */
body{-webkit-user-select:none;user-select:none;-webkit-touch-callout:none}
img{-webkit-user-drag:none;user-select:none;-webkit-user-select:none}
input,textarea,select,option,[contenteditable="true"],code,pre,.lesson-fen,.fen,.fen-text{-webkit-user-select:text;user-select:text}

/* File numbers: red 一–九 from red's right; black 1–9 from black's right. */
.board-frame{padding:19px 13px}
.board-coords{position:absolute;left:13px;right:13px;display:grid;grid-template-columns:repeat(9,1fr);pointer-events:none;z-index:6;font:600 11px/11px var(--chess);text-align:center;color:#4f3a1e}
.board-coords.top{top:2px}
.board-coords.bottom{bottom:2px}
.board-coords span{display:block;padding:1px 0;background:#f6e7c9e6;border:1px solid #c8ad7f80;border-radius:2px}
@media(max-width:700px){.board-frame{padding:16px 11px}.board-coords{left:11px;right:11px;font-size:10px;line-height:10px}.board-coords span{padding:1px 0}}