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var(--panel-border);justify-content:space-between;align-items:center;gap:16px;padding:14px 18px;transition:background .12s;display:flex}.setting-row:last-child{border-bottom:none}.setting-row:hover{background:var(--nav-item-hover-bg)}.setting-info{flex-direction:column;flex:1;gap:2px;min-width:0;display:flex}.setting-label{color:var(--text-main);font-size:.9rem;font-weight:500}.setting-desc{color:var(--text-subtle);font-size:.76rem}.setting-control{flex-shrink:0}.select-trigger{background:var(--btn-bg);border:1px solid var(--btn-border);color:var(--btn-color);cursor:pointer;white-space:nowrap;-webkit-tap-highlight-color:transparent;border-radius:9px;justify-content:space-between;align-items:center;gap:6px;min-width:130px;padding:7px 10px 7px 13px;font-family:inherit;font-size:.85rem;transition:background .14s,border-color .14s,color .14s;display:inline-flex}.select-trigger:hover{background:var(--btn-bg-hover);border-color:var(--panel-border-strong);color:var(--text-main)}.select-trigger:active{background:var(--accent-muted)}.select-trigger--disabled{opacity:.38;cursor:not-allowed}.select-trigger-value{flex:1}.select-trigger-chevron{opacity:.55;flex-shrink:0;justify-content:center;align-items:center;width:14px;height:14px;display:flex}.select-trigger-chevron svg{width:100%;height:100%}.setting-row .slider-control{width:200px}.appearance-preview-wrap{flex-wrap:wrap;justify-content:center;align-items:flex-start;gap:18px;padding:22px 20px 24px;display:flex}.board-preview{aspect-ratio:1;border:1px solid var(--panel-border);border-radius:16px;flex-shrink:0;grid-template-rows:repeat(4,1fr);grid-template-columns:repeat(4,1fr);width:min(100%,400px);display:grid;overflow:hidden;box-shadow:0 14px 32px #0000003d}.board-preview-sq{justify-content:center;align-items:center;display:flex;position:relative}.board-preview-sq.sq-light{background:var(--board-light)}.board-preview-sq.sq-dark{background:var(--board-dark)}.board-preview-piece{object-fit:contain;pointer-events:none;filter:drop-shadow(0 1px 3px #00000059);width:92%;height:92%}.appearance-preview-controls{background:var(--panel-bg);border:1px solid var(--panel-border);width:min(100%,280px);box-shadow:var(--panel-shadow);border-radius:18px;flex-direction:column;align-items:center;gap:16px;padding:16px;display:flex}.appearance-preview-control-item{text-align:center;flex-direction:column;align-items:center;gap:4px;width:100%;display:flex}.appearance-preview-control-label{letter-spacing:.05em;text-transform:uppercase;color:var(--text-subtle);text-align:center;font-size:.72rem;font-weight:600}.appearance-preview-control-item .select-trigger{width:min(100%,240px);min-width:0}.custom-board-colors{grid-template-columns:1fr 1fr;gap:12px;width:100%;display:grid}.custom-color-item{background:var(--panel-bg);border:1px solid var(--panel-border);border-radius:14px;flex-direction:column;align-items:center;gap:8px;padding:10px;display:flex}.custom-color-label{color:var(--text-subtle);text-transform:uppercase;letter-spacing:.06em;font-size:.76rem}.custom-color-picker{cursor:pointer;border:none;border-radius:12px;width:100%;height:42px;padding:0}.engine-presets{gap:8px;padding:14px 16px;display:flex}.engine-preset-btn{background:var(--btn-bg);border:1px solid var(--btn-border);cursor:pointer;-webkit-tap-highlight-color:transparent;border-radius:12px;flex-direction:column;flex:1;align-items:center;gap:4px;padding:12px 8px;font-family:inherit;transition:background .15s,border-color .15s,transform .1s;display:flex;position:relative}.engine-preset-btn:hover{background:var(--btn-bg-hover);border-color:var(--panel-border-strong);transform:translateY(-1px)}.engine-preset-btn:active{transform:translateY(0)}.engine-preset-btn.active{background:var(--accent-muted);border-color:var(--accent-border)}.engine-preset-icon{font-size:1.4rem;line-height:1}.engine-preset-label{color:var(--text-main);font-size:.82rem;font-weight:700}.engine-preset-check{color:var(--accent);font-size:.92rem;line-height:1;position:absolute;top:10px;right:10px}.engine-preset-desc{color:var(--text-subtle);font-size:.7rem}@media (width<=640px){.appearance-preview-wrap{flex-direction:column;justify-content:center;align-items:center;gap:10px;padding:14px 12px}.board-preview{width:min(100%,340px)}.appearance-preview-controls{width:100%;max-width:340px;padding:12px}}@media (width<=480px){.settings-page{padding:20px 14px 30px}.setting-section{margin-bottom:18px}.setting-row{text-align:center;flex-direction:column;align-items:center;gap:8px;padding:12px 14px}.setting-row .setting-info{align-items:center}.setting-row .slider-control{width:100%}.setting-control{justify-content:center;width:100%;display:flex}.select-trigger{width:100%;max-width:320px}.appearance-preview-wrap{gap:8px;padding:10px}.board-preview{width:min(100%,320px)}.appearance-preview-controls{max-width:260px}.custom-board-colors{grid-template-columns:1fr}.engine-presets{flex-direction:column;align-items:center;gap:6px;padding:10px 12px}.engine-preset-btn{width:100%;max-width:320px;padding:10px 8px}}:root{--nav-w:72px;--nav-h-mobile:62px}.app-nav{width:var(--nav-w);background:var(--nav-bg);border-right:1px solid var(--panel-border);z-index:200;flex-direction:column;align-items:center;gap:6px;height:100dvh;padding:16px 0 24px;display:flex;position:fixed;top:0;left:0}.app-nav-logo{opacity:.7;flex-shrink:0;width:32px;height:32px;margin-bottom:20px}.app-nav-logo svg{width:100%;height:100%}.app-nav-list{flex-direction:column;align-items:center;gap:2px;width:100%;margin:0;padding:0;list-style:none;display:flex}.app-nav-item{width:52px;color:var(--nav-item-color);cursor:pointer;background:0 0;border:none;border-radius:12px;flex-direction:column;justify-content:center;align-items:center;gap:4px;padding:9px 0;font-family:inherit;text-decoration:none;transition:color .18s,background .18s;display:flex}.app-nav-item:hover{color:var(--text-muted);background:var(--nav-item-hover-bg)}.app-nav-item.active{color:var(--nav-item-active-color);background:var(--nav-item-active-bg)}.app-nav-icon{flex-shrink:0;justify-content:center;align-items:center;width:20px;height:20px;display:flex}.app-nav-icon svg{width:100%;height:100%}.app-nav-label{letter-spacing:.05em;text-transform:uppercase;white-space:nowrap;font-size:.56rem;font-weight:600;line-height:1}@media (width<=640px){.app-nav{width:100%;height:var(--nav-h-mobile);padding:0 8px env(safe-area-inset-bottom,0);border-right:none;border-top:1px solid var(--panel-border);flex-direction:row;justify-content:space-around;align-items:center;gap:0;inset:auto 0 0}.app-nav-logo{display:none}.app-nav-list{flex-direction:row;justify-content:space-around;gap:0;width:100%}.app-nav-item{border-radius:10px;flex:1;width:auto;padding:8px 4px}.app-nav-label{font-size:.53rem}}