/* =========================================================
   ChessReboot UI - Minimal / Google-ish baseline
   ========================================================= */

/* Tokens (global-ish) */
.crb-wrap,
.crb-lesson,
.crb-lessons-list{
  --crb-font: system-ui, -apple-system, Segoe UI, Roboto, Arial, "Noto Sans", "Helvetica Neue", sans-serif;
  --crb-text: rgba(0,0,0,.88);
  --crb-muted: rgba(0,0,0,.62);
  --crb-bg: #fff;
  --crb-bg-soft: rgba(0,0,0,.02);
  --crb-border: rgba(0,0,0,.10);
  --crb-border-strong: rgba(0,0,0,.16);
  --crb-radius: 14px;
  --crb-radius-sm: 10px;
  --crb-shadow: 0 8px 24px rgba(0,0,0,.06);
  --crb-shadow-hover: 0 12px 34px rgba(0,0,0,.10);
  --crb-gap: 10px;
}

/* Lessons list layout */
.crb-lessons-list{
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 14px;
  margin: 12px 0;
  font-family: var(--crb-font);
}

/* Layout wrapper */
.crb-wrap{
  width: 100%;
  max-width: 980px;              /* Google-ish centered content */
  margin: 18px auto;
  padding: 16px;
  border: 1px solid var(--crb-border);
  border-radius: var(--crb-radius);
  background: var(--crb-bg);
  box-shadow: var(--crb-shadow);

  font-family: var(--crb-font);
  color: var(--crb-text);
}

/* Lesson outer wrapper (optional container) */
.crb-lesson{
  font-family: var(--crb-font);
  color: var(--crb-text);
}

body.single-crb_lesson .entry-meta,
body.single-crb_lesson .post-meta,
body.single-crb_lesson .posted-on,
body.single-crb_lesson .byline,
body.single-crb_lesson .author,
body.single-crb_lesson time,
body.single-crb_lesson .entry-footer{
  display:none !important;
}

.crb-no-json{ display:none; }

/* Top bar */
.crb-top{
  display:flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--crb-border);
  margin-bottom: 10px;
}

.crb-score,
.crb-step{
  font-size: 14px;
  color: var(--crb-muted);
}

.crb-score-val,
.crb-step-val{
  color: var(--crb-text);
  font-weight: 700;
}

.crb-step-label{
  opacity: .85;
  font-weight: 600;
  margin-left: 6px;
}

/* Prompt & message */
.crb-prompt{
  margin: 10px 0 6px 0;
  font-size: 16px;
  font-weight: 650;
  letter-spacing: -0.2px;
}

.crb-msg{
  margin: 6px 0 10px 0;
  padding: 10px 12px;
  border: 1px solid var(--crb-border);
  border-radius: var(--crb-radius-sm);
  background: rgba(255,255,255,1);
  font-weight: 600;
}

.crb-board { width: 640px; }

.crb-wrap[data-crb-mode="lesson"]{
  display: block; /* eski flex-center override */
}

.crb-wrap[data-crb-mode="lesson"] .crb-layout{
  display: grid;
  grid-template-columns: 640px minmax(280px, 1fr);
  gap: 16px;
  align-items: start;
  width: 100%;
  margin-top: 10px;
}

.crb-wrap[data-crb-mode="lesson"][class~="crb-revealed"] .crb-left{
  grid-column: 1;
}

.crb-wrap[data-crb-mode="lesson"][class~="crb-revealed"] .crb-right{
  display: block;
  grid-column: 2;         
  min-width: 280px;      
  width: 100%;
}

.crb-wrap[data-crb-mode="lesson"] .crb-right{ clear: none; float: none; }

.crb-wrap[data-crb-mode="lesson"] .crb-left{
  display: flex;
  flex-direction: column;
  align-items: center; /* tahta + aday hamleler merkezde */
}

.crb-wrap[data-crb-mode="lesson"] .crb-right{
  display: none; 
  border: 1px solid var(--crb-border);
  border-radius: var(--crb-radius);
  background: var(--crb-bg-soft);
  padding: 12px;

  position: sticky;
  top: 16px;
  max-height: calc(100vh - 140px);
  overflow: auto;
}

.crb-wrap[data-crb-mode="lesson"].crb-revealed .crb-right{
  display: block;
}
.crb-wrap[data-crb-mode="lesson"] .crb-right .crb-msg{
  margin-top: 0;
}

.crb-wrap[data-crb-mode="lesson"] .crb-right .crb-explain{
  margin: 0;
}

/* Mobile: panel alta insin */
@media (max-width: 980px){
  .crb-wrap[data-crb-mode="lesson"] .crb-layout{
    grid-template-columns: 1fr;
  }
  .crb-wrap[data-crb-mode="lesson"] .crb-right{
    position: static;
    max-height: none;
  }
}

.crb-wrap .board-b72b1 {
  background: none; 
  border-radius: 4px;
  overflow: hidden;
  
  border: none;
  box-shadow: 0 2px 6px rgba(0,0,0,0.25); 
}

.crb-wrap .board-b72b1 .white-1e1d7 { background-color: #f0d9b5; }
.crb-wrap .board-b72b1 .black-3c85d { background-color: #b58863; }

.crb-choices {
  margin: 16px 0 8px 0;
  display: flex;
  flex-wrap: wrap;
  justify-content: center; 
  gap: 10px;
}

.crb-explain{
  margin: 10px 0 10px 0;
  display: grid;
  gap: 10px;
}

/* Buttons (baseline) */
.crb-btn{
  appearance: none;
  -webkit-appearance: none;

  border: 1px solid var(--crb-border-strong);
  border-radius: 12px;
  background: #fff;

  padding: 10px 12px;
  cursor: pointer;

  font-family: var(--crb-font);
  font-size: 14px;
  font-weight: 600;
  color: rgba(0,0,0,.86);

  box-shadow: 0 1px 2px rgba(0,0,0,.05);
  transition: transform .12s ease, box-shadow .12s ease, filter .12s ease, background-color .12s ease;
}

.crb-btn:hover{
  background: rgba(0,0,0,.02);
  box-shadow: 0 6px 18px rgba(0,0,0,.08);
  transform: translateY(-1px);
}

.crb-btn:active{
  transform: translateY(0px);
  box-shadow: 0 2px 10px rgba(0,0,0,.08);
}

.crb-btn:disabled{
  opacity: .55;
  cursor: not-allowed;
  transform: none;
  box-shadow: 0 1px 2px rgba(0,0,0,.04);
}

/* Better keyboard focus */
.crb-btn:focus-visible{
  outline: 3px solid rgba(0,0,0,.18);
  outline-offset: 2px;
}

/* Choice button content */
.crb-choice{
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.crb-choice-san{
  letter-spacing: .1px;
}

/* Candidate points should NOT show on buttons */
.crb-choices .crb-choice-pts{
  display:none !important;
}

/* Controls */
.crb-controls{
  margin-top: 12px;
  display:flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* PGN area */
.crb-label{
  display:block;
  margin-top: 14px;
  font-weight: 650;
  color: var(--crb-muted);
}

.crb-pgn{
  width: 100%;
  margin-top: 8px;
  padding: 10px 12px;
  border: 1px solid var(--crb-border);
  border-radius: 12px;
  background: rgba(0,0,0,.02);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  font-size: 13px;
  color: rgba(0,0,0,.82);
}

/* Selected summary */
.crb-selected{
  padding: 12px 12px;
  border: 1px solid var(--crb-border);
  border-radius: 12px;
  background: rgba(255,255,255,1);
}

.crb-selected-exp{
  margin-top: 6px;
  color: rgba(0,0,0,.78);
}

/* Explanation rows */
.crb-exp-row{
  padding: 12px 12px;
  border: 1px solid var(--crb-border);
  border-radius: 12px;
  background: #fff;
}

.crb-exp-selected{
  outline: 2px solid rgba(0,0,0,.22);
  outline-offset: 2px;
}

.crb-badge{
  opacity: .72;
  font-weight: 700;
}

.crb-pts{
  opacity: .75;
  font-weight: 700;
  margin-left: 6px;
}

.crb-mainline{
  margin-left: 8px;
  font-weight: 800;
  opacity: .75;
}

.crb-why{
  margin-top: 8px;
  color: rgba(0,0,0,.80);
  line-height: 1.45;
}

/* Type emphasis (still minimal, no hard colors) */
.crb-exp-best{ font-weight: 750; }
.crb-exp-good{ font-weight: 650; }
.crb-exp-book{ font-weight: 650; opacity: .98; }
.crb-exp-wrong{ opacity: .92; }


/* Lesson card */
.crb-lesson-card{
  border: 1px solid var(--crb-border);
  border-radius: var(--crb-radius);
  padding: 14px;
  background: #fff;
  box-shadow: var(--crb-shadow);
  transition: transform .12s ease, box-shadow .12s ease;
}

.crb-lesson-card:hover{
  transform: translateY(-2px);
  box-shadow: var(--crb-shadow-hover);
}

.crb-lesson-card h3{
  margin: 0 0 6px 0;
  font-size: 16px;
  letter-spacing: -0.2px;
}

.crb-lesson-card h3 a{
  text-decoration: none;
  color: var(--crb-text);
}

.crb-lesson-card h3 a:hover{
  text-decoration: underline;
}

.crb-lesson-header{
  margin: 0 0 10px 0;
}

.crb-lesson-title{
  font-weight: 800;
  font-size: 20px;
  margin: 0 0 6px 0;
}

.crb-lesson-desc{
  opacity: .85;
  margin-bottom: 8px;
  line-height: 1.5;
}

/* Mobile spacing tweak */
@media (max-width: 520px){
  .crb-wrap{
    padding: 12px;
    margin: 12px auto;
  }
  .crb-top{
    align-items: flex-start;
  }
}
.crb-css-sanity { display:block; }

/* ==============================
   Last move arrow (lichess-like)
   ============================== */

.crb-board{
  position: relative;
}

/* SVG overlay */
.crb-arrow-layer{
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 2;
}

/* Shadow (under arrow) */
.crb-arrow-layer .crb-arrow-shadow{
  stroke: rgba(0,0,0,.25);
  stroke-linecap: round;
  fill: none;
}

/* Main arrow + head */
.crb-arrow-layer .crb-arrow{
  stroke: var(--crb-arrow-color, rgba(46, 204, 113, .78));
  stroke-linecap: round;
  fill: none;
}

.crb-arrow-layer .crb-arrow-head{
  fill: var(--crb-arrow-color, rgba(46, 204, 113, .78));
  stroke: var(--crb-arrow-color, rgba(46, 204, 113, .78));
}