:root{--bg-primary: #1c1c1e;--bg-secondary: #2c2c2e;--bg-tertiary: #3a3a3c;--bg-card: #2c2c2e;--bg-hover: #3a3a3c;--bg-input: #1c1c1e;--accent: #34c759;--accent-hover: #2db84e;--accent-blue: #0a84ff;--accent-blue-hover: #409cff;--text-primary: #f5f5f7;--text-secondary: #a1a1a6;--text-muted: #636366;--border-color: rgba(255,255,255,.08);--border-focus: rgba(52,199,89,.6);--success: #34c759;--error: #ff453a;--warning: #ff9f0a;--board-light: #f0d9b5;--board-dark: #b58863;--board-highlight: rgba(255, 255, 0, .35);--board-selected: rgba(52, 199, 89, .4);--board-best-from: rgba(52, 199, 89, .35);--board-best-to: rgba(52, 199, 89, .55);--radius-sm: 8px;--radius-md: 12px;--radius-lg: 16px;--font-main: "Inter", -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI", Roboto, sans-serif;--font-mono: "SF Mono", "Menlo", "Courier New", monospace;--board-size: 560px;--square-size: 70px}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font-main);background:var(--bg-primary);color:var(--text-primary);font-size:14px;min-height:100vh;overflow-x:hidden;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}#app{display:flex;flex-direction:column;min-height:100vh}.app-header{display:flex;justify-content:space-between;align-items:center;padding:14px 28px;background:#2c2c2ed9;backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);border-bottom:1px solid var(--border-color)}.header-left{display:flex;align-items:center;gap:10px;flex:1}.header-right{flex:1;display:flex;justify-content:flex-end}.logo-img{width:28px;height:28px;border-radius:6px;object-fit:contain}.app-title{font-size:18px;font-weight:700;color:var(--text-primary);letter-spacing:-.3px}.header-center{display:flex;align-items:center}.color-picker{display:flex;align-items:center;gap:12px}.color-picker-label{font-size:13px;color:var(--text-secondary);font-weight:500}.color-toggle{display:flex;background:var(--bg-primary);border-radius:var(--radius-md);padding:3px;gap:2px}.color-btn{display:flex;align-items:center;gap:6px;padding:6px 16px;border:none;border-radius:10px;cursor:pointer;font-size:13px;font-weight:600;font-family:var(--font-main);background:transparent;color:var(--text-secondary);transition:all .2s ease}.color-btn.active{background:var(--accent);color:#fff;box-shadow:0 2px 8px #34c7594d}.color-btn:hover:not(.active){background:var(--bg-tertiary);color:var(--text-primary)}.color-dot{width:12px;height:12px;border-radius:50%;display:inline-block}.white-dot{background:#fff;border:1px solid rgba(0,0,0,.2)}.black-dot{background:#333;border:1px solid rgba(255,255,255,.2)}.new-game-btn{padding:8px 20px;border:none;border-radius:20px;cursor:pointer;font-size:13px;font-weight:600;font-family:var(--font-main);background:var(--accent);color:#fff;box-shadow:0 2px 8px #34c7594d;transition:all .2s ease}.new-game-btn:hover{background:var(--accent-hover);box-shadow:0 4px 12px #34c75966;transform:translateY(-1px)}.new-game-btn:active{transform:scale(.97)}.disclaimer-banner{display:flex;align-items:center;gap:10px;padding:10px 20px;background:#ff9f0a1f;border-bottom:1px solid rgba(255,159,10,.25);font-size:13px;color:var(--text-primary)}.disclaimer-icon{font-size:16px;flex-shrink:0}.disclaimer-text{flex:1}.disclaimer-text strong{color:#ff9f0a}.disclaimer-close{background:none;border:none;color:var(--text-secondary);font-size:20px;cursor:pointer;padding:0 4px;line-height:1;flex-shrink:0}.disclaimer-close:hover{color:var(--text-primary)}.disclaimer-banner.hidden{display:none}.app-main{display:flex;justify-content:center;gap:24px;padding:24px;flex:1}.board-area{display:flex;gap:0;flex-shrink:0}.eval-bar{width:24px;height:var(--board-size);background:#3a3a3c;border-radius:var(--radius-md);position:relative;overflow:hidden;margin-right:10px;align-self:center}.eval-bar-white{position:absolute;bottom:0;left:0;right:0;height:50%;background:#f5f5f7;transition:height .5s cubic-bezier(.4,0,.2,1);border-radius:0 0 var(--radius-md) var(--radius-md)}.eval-bar-label{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);font-size:9px;font-weight:700;color:#000;text-shadow:0 0 4px rgba(255,255,255,.9);z-index:2;white-space:nowrap;writing-mode:vertical-rl;text-orientation:mixed;font-family:var(--font-mono)}.board-wrapper{position:relative;display:grid;grid-template-columns:20px var(--board-size) 20px;grid-template-rows:20px var(--board-size) 20px;align-self:center}.board-coords-top,.board-coords-bottom{grid-column:2;display:flex}.board-coords-top{grid-row:1}.board-coords-bottom{grid-row:3}.board-coords-left,.board-coords-right{grid-row:2;display:flex;flex-direction:column}.board-coords-left{grid-column:1}.board-coords-right{grid-column:3}.coord-label{flex:1;display:flex;align-items:center;justify-content:center;font-size:10px;color:var(--text-muted);font-weight:600;font-family:var(--font-mono)}.board{grid-column:2;grid-row:2;width:var(--board-size);height:var(--board-size);display:grid;grid-template-columns:repeat(8,var(--square-size));grid-template-rows:repeat(8,var(--square-size));border-radius:var(--radius-sm);overflow:hidden;box-shadow:0 8px 32px #0006,0 2px 8px #0003;-webkit-user-select:none;user-select:none}.square{width:var(--square-size);height:var(--square-size);display:flex;align-items:center;justify-content:center;cursor:pointer;position:relative;font-size:48px;line-height:1;transition:background .1s}.square-light{background:var(--board-light)}.square-dark{background:var(--board-dark)}.square.selected{background:var(--board-selected)!important}.square.highlight{background:var(--board-highlight)!important}.square.best-from:after,.square.best-to:after{content:"";position:absolute;top:0;right:0;bottom:0;left:0;pointer-events:none}.square.best-from:after{background:var(--board-best-from)}.square.best-to:after{background:var(--board-best-to)}.square.move-best-to{background:#34c7598c!important}.square.move-best-from{background:#34c7594d!important}.square.move-good-to{background:#ffcc0080!important}.square.move-good-from{background:#ffcc0040!important}.square.move-okay-to{background:#ff3b3073!important}.square.move-okay-from{background:#ff3b3033!important}.square.legal-move:before{content:"";position:absolute;width:18px;height:18px;border-radius:50%;background:#0000001f}.square.legal-capture:before{content:"";position:absolute;top:5px;right:5px;bottom:5px;left:5px;border-radius:50%;border:3px solid rgba(0,0,0,.12);background:transparent}.piece{pointer-events:none;filter:drop-shadow(0 1px 2px rgba(0,0,0,.3))}.piece-white{color:#fff;-webkit-text-stroke:1px #333;paint-order:stroke fill;text-shadow:none}.piece-black{color:#1a1a1a;-webkit-text-stroke:.5px #000;paint-order:stroke fill;text-shadow:none}.arrows-overlay{position:absolute;top:20px;left:20px;width:var(--board-size);height:var(--board-size);pointer-events:none;z-index:10}.arrows-overlay g{pointer-events:visibleStroke}.side-panel{width:360px;display:flex;flex-direction:column;gap:10px;max-height:calc(var(--board-size) + 40px);overflow-y:auto;padding-right:4px}.card{background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius-md);padding:14px 16px;overflow:visible;position:relative}.card-icon-row{display:flex;align-items:center;gap:8px;margin-bottom:10px}.star-icon{color:var(--warning);font-size:18px}.card-title{font-size:14px;font-weight:600;color:var(--text-primary);letter-spacing:-.2px}.best-move-card{background:linear-gradient(135deg,rgba(52,199,89,.08) 0%,var(--bg-card) 100%);border-color:#34c75926}.best-move-display{padding:8px 0}.best-move-text{font-size:22px;font-weight:700;color:var(--accent);font-family:var(--font-mono);letter-spacing:.5px}.score-row{display:flex;align-items:center;gap:16px;padding-top:8px;border-top:1px solid var(--border-color)}.score-block{display:flex;align-items:baseline;gap:8px}.score-label{font-size:12px;color:var(--text-muted);font-weight:500}.score-value{font-size:24px;font-weight:700;font-family:var(--font-mono);color:var(--text-primary)}.score-value.positive{color:var(--accent)}.score-value.negative{color:var(--error)}.score-value.mate{color:var(--warning)}.assessment-text{font-size:13px;color:var(--text-secondary);font-weight:500}.depth-badge{margin-left:auto;font-size:11px;padding:2px 8px;border-radius:6px;background:var(--bg-primary);color:var(--text-muted);font-family:var(--font-mono);font-weight:600}.arrow-legend{display:flex;gap:12px;margin-bottom:8px;padding:0 2px}.legend-item{display:flex;align-items:center;gap:5px;font-size:11px;color:var(--text-secondary);font-weight:500}.legend-dot{width:8px;height:8px;border-radius:50%;display:inline-block}.pv-lines{display:flex;flex-direction:column;gap:4px}.pv-line{display:flex;align-items:flex-start;gap:8px;padding:8px 10px;border-radius:var(--radius-sm);background:var(--bg-primary);font-size:13px;cursor:pointer;transition:all .15s ease}.pv-line:hover{background:var(--bg-tertiary)}.pv-line.pv-placeholder{color:var(--text-muted);cursor:default;font-size:13px}.pv-line.pv-placeholder:hover{background:var(--bg-primary)}.pv-rank{font-weight:700;color:var(--text-muted);min-width:16px}.pv-eval{font-weight:700;font-family:var(--font-mono);min-width:50px;text-align:right;color:var(--text-primary);font-size:13px}.pv-eval.positive{color:var(--accent)}.pv-eval.negative{color:var(--error)}.pv-moves{color:var(--text-secondary);font-family:var(--font-mono);font-size:11px;line-height:1.5;word-break:break-word}.controls-content{display:flex;flex-direction:column;gap:12px}.slider-row{display:flex;align-items:center;gap:10px}.control-label{font-size:13px;color:var(--text-secondary);font-weight:500;min-width:60px}.apple-slider{flex:1;-webkit-appearance:none;height:4px;background:var(--bg-primary);border-radius:2px;outline:none}.apple-slider::-webkit-slider-thumb{-webkit-appearance:none;width:20px;height:20px;background:#fff;border-radius:50%;cursor:pointer;box-shadow:0 1px 4px #0000004d,0 0 1px #0000001a;transition:transform .15s}.apple-slider::-webkit-slider-thumb:hover{transform:scale(1.1)}.slider-value{font-family:var(--font-mono);font-size:14px;font-weight:700;color:var(--text-primary);min-width:24px;text-align:center}.button-row{display:flex;gap:8px}.btn{padding:8px 18px;border:none;border-radius:var(--radius-sm);cursor:pointer;font-size:13px;font-weight:600;font-family:var(--font-main);transition:all .2s ease;display:flex;align-items:center;justify-content:center;gap:6px}.btn-primary{background:var(--accent);color:#fff;flex:1}.btn-primary:hover{background:var(--accent-hover)}.btn-primary:active{transform:scale(.97)}.btn-primary:disabled{background:var(--bg-tertiary);color:var(--text-muted);cursor:not-allowed}.btn-outline{background:transparent;color:var(--text-secondary);border:1px solid var(--border-color)}.btn-outline:hover:not(:disabled){background:var(--bg-hover);color:var(--text-primary)}.btn-outline:disabled{color:var(--text-muted);cursor:not-allowed;opacity:.5}.btn-ghost{background:transparent;color:var(--text-secondary);padding:6px 12px;font-size:12px}.btn-ghost:hover{background:var(--bg-hover);color:var(--text-primary);border-radius:var(--radius-sm)}.btn-small{background:var(--accent-blue);color:#fff;padding:6px 14px;font-size:12px;border-radius:var(--radius-sm)}.btn-small:hover{background:var(--accent-blue-hover)}.btn-full{width:100%;margin-top:8px}.toggle-row{display:flex;align-items:center;gap:10px}.apple-toggle{position:relative;width:44px;height:26px;flex-shrink:0}.apple-toggle input{opacity:0;width:0;height:0}.toggle-track{position:absolute;top:0;right:0;bottom:0;left:0;background:var(--bg-primary);border-radius:13px;cursor:pointer;transition:background .3s}.toggle-track:before{content:"";position:absolute;width:22px;height:22px;left:2px;top:2px;background:#fff;border-radius:50%;box-shadow:0 1px 3px #0000004d;transition:transform .3s cubic-bezier(.4,0,.2,1)}.apple-toggle input:checked+.toggle-track{background:var(--accent)}.apple-toggle input:checked+.toggle-track:before{transform:translate(18px)}.toggle-text{font-size:13px;color:var(--text-secondary);font-weight:500}.action-row{display:flex;gap:4px;flex-wrap:wrap}.nav-buttons{display:flex;gap:4px;margin-bottom:8px}.btn-nav{flex:1;background:var(--bg-primary);color:var(--text-secondary);border:1px solid var(--border-color);border-radius:var(--radius-sm);padding:8px;cursor:pointer;font-size:14px;transition:all .15s ease}.btn-nav:hover{background:var(--bg-hover);color:var(--text-primary)}.move-list{max-height:140px;overflow-y:auto;background:var(--bg-primary);border-radius:var(--radius-sm);padding:8px}.move-placeholder{color:var(--text-muted);font-size:13px;text-align:center;padding:12px}.move-row{display:flex;align-items:center;gap:2px;font-size:13px;font-family:var(--font-mono)}.move-number{color:var(--text-muted);min-width:28px;text-align:right;padding-right:4px;font-size:12px}.move-cell{padding:3px 8px;border-radius:6px;cursor:pointer;color:var(--text-secondary);transition:all .15s;min-width:55px}.move-cell:hover{background:var(--bg-hover);color:var(--text-primary)}.move-cell.active{background:var(--accent);color:#fff;font-weight:600}.collapsible{cursor:default}.collapsible summary{cursor:pointer;list-style:none}.collapsible summary::-webkit-details-marker{display:none}.clickable{padding:14px 16px;margin:-14px -16px;border-radius:var(--radius-md);transition:background .15s}.clickable:hover{background:var(--bg-hover)}.chevron{margin-left:auto;color:var(--text-muted);font-size:12px;transition:transform .2s}details[open] .chevron{transform:rotate(180deg)}.card-body{padding-top:12px}.import-section{margin-bottom:14px}.import-section:last-child{margin-bottom:0}.field-label{display:block;font-size:12px;color:var(--text-muted);font-weight:500;margin-bottom:6px}.input-row{display:flex;gap:6px}.apple-input{flex:1;padding:8px 12px;background:var(--bg-input);border:1px solid var(--border-color);border-radius:var(--radius-sm);color:var(--text-primary);font-family:var(--font-mono);font-size:12px;outline:none;transition:border-color .2s}.apple-input:focus{border-color:var(--border-focus);box-shadow:0 0 0 3px #34c75926}.apple-textarea{width:100%;padding:8px 12px;background:var(--bg-input);border:1px solid var(--border-color);border-radius:var(--radius-sm);color:var(--text-primary);font-family:var(--font-mono);font-size:12px;resize:vertical;outline:none;transition:border-color .2s}.apple-textarea:focus{border-color:var(--border-focus);box-shadow:0 0 0 3px #34c75926}.position-info{display:flex;align-items:center;gap:8px;padding:8px 0}.position-label{font-size:11px;color:var(--text-muted);font-weight:500;white-space:nowrap}.fen-display{font-family:var(--font-mono);font-size:10px;color:var(--text-muted);word-break:break-all;overflow:hidden;text-overflow:ellipsis}.status-bar{padding:8px 28px;background:#2c2c2ed9;backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);border-top:1px solid var(--border-color);font-size:12px;color:var(--text-muted)}.side-panel::-webkit-scrollbar,.move-list::-webkit-scrollbar{width:4px}.side-panel::-webkit-scrollbar-track,.move-list::-webkit-scrollbar-track{background:transparent}.side-panel::-webkit-scrollbar-thumb,.move-list::-webkit-scrollbar-thumb{background:#ffffff1a;border-radius:2px}.side-panel::-webkit-scrollbar-thumb:hover,.move-list::-webkit-scrollbar-thumb:hover{background:#fff3}@keyframes pulse-soft{0%,to{opacity:1}50%{opacity:.6}}.analyzing{animation:pulse-soft 1.5s ease infinite}.info-tip{position:relative;display:inline-flex;align-items:center;justify-content:center;cursor:help;font-size:14px;color:var(--text-muted);width:20px;height:20px;border-radius:50%;transition:color .15s,background .15s;flex-shrink:0}.info-tip:hover,.info-tip:focus{color:var(--accent);background:#34c7591a;outline:none}.info-tip-inline{font-size:12px;width:16px;height:16px;vertical-align:middle}.info-tip-text{display:none}.floating-tooltip{position:fixed;width:240px;padding:10px 12px;background:#1c1c1ef7;border:1px solid rgba(255,255,255,.15);border-radius:var(--radius-sm);font-size:12px;font-weight:400;line-height:1.5;color:var(--text-secondary);font-family:var(--font-main);box-shadow:0 8px 24px #0009;z-index:99999;pointer-events:none;text-align:left;white-space:normal}.eval-bar-tip{position:absolute;top:6px;left:50%;transform:translate(-50%);font-size:10px;width:16px;height:16px;z-index:3;color:#0006}.eval-bar-tip:hover,.eval-bar-tip:focus{color:var(--accent);background:#34c75933}@media(max-width:1060px){:root{--board-size: 440px;--square-size: 55px}.app-main{padding:16px;gap:16px}.side-panel{width:320px}.square{font-size:40px}}@media(max-width:900px){:root{--board-size: 400px;--square-size: 50px}.app-main{flex-direction:column;align-items:center;padding:16px}.side-panel{width:100%;max-width:440px;max-height:none}.square{font-size:36px}.app-header{flex-wrap:wrap;gap:8px;padding:12px 16px;justify-content:center}.header-left{order:1}.header-right{order:2}.header-center{order:3;width:100%;justify-content:center}.status-bar{padding:8px 16px}}@media(max-width:520px){:root{--board-size: calc(100vw - 76px) ;--square-size: calc((100vw - 76px)/8) }.app-main{padding:10px;gap:12px}.app-header{padding:10px 12px;gap:6px;flex-wrap:wrap}.header-left{order:1}.header-right{order:2}.header-center{order:3;width:100%;justify-content:center}.app-title{font-size:16px}.logo-img{width:26px;height:26px}.color-picker-label{font-size:12px}.color-picker{gap:8px}.color-btn{padding:5px 12px;font-size:12px}.new-game-btn{padding:6px 14px;font-size:12px}.board-wrapper{grid-template-columns:16px var(--board-size) 16px;grid-template-rows:16px var(--board-size) 16px}.arrows-overlay{top:16px;left:16px}.coord-label{font-size:8px}.eval-bar{width:20px;margin-right:6px}.eval-bar-label{font-size:8px}.square{font-size:calc((100vw - 76px)*.0875)}.side-panel{max-width:100%;gap:8px}.card{padding:12px}.card-title{font-size:13px}.best-move-text{font-size:18px}.score-value{font-size:20px}.pv-line{padding:6px 8px;font-size:12px}.pv-moves{font-size:10px}.move-list{max-height:120px}.btn{padding:7px 14px;font-size:12px}.btn-ghost{padding:5px 8px;font-size:11px}.btn-nav{padding:6px;font-size:12px}.status-bar{padding:6px 12px;font-size:11px}.floating-tooltip{width:200px;font-size:11px;padding:8px 10px}}