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;--lightningcss-dark:initial;color-scheme:dark;--bg:#191817;--surface:#211f1d;--surface-2:#2a2825;--border:#35322d;--border-strong:#47433c;--fg:#e9e6df;--fg-muted:#9d978c;--fg-faint:#726c62;--accent:#6ea3d8;--accent-hover:#83b3e2;--accent-fg:#14171b;--accent-tint:#23303d;--error-fg:#f0897d;--error-bg:#3a2321;--warning-fg:#e0b25a;--warning-bg:#362d19;--good-fg:#8fc994;--good-bg:#21301f;--neutral-fg:#a7a29a;--neutral-bg:#2c2a26}*{box-sizing:border-box}html,body{margin:0;padding:0}body{background-color:var(--bg);color:var(--fg);font-family:var(--font);-webkit-font-smoothing:antialiased;font-size:15px;line-height:1.5}h1,h2,h3{margin:0;font-weight:600;line-height:1.25}a{color:inherit;text-decoration:none}button{font-family:inherit;font-size:inherit;cursor:pointer}.sr-only{clip:rect(0, 0, 0, 0);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}.app-shell{flex-direction:column;min-height:100dvh;display:flex}.topbar{border-bottom:1px solid var(--border);background:var(--surface);z-index:10;align-items:center;gap:24px;height:52px;padding:0 20px;display:flex;position:sticky;top:0}.topbar__brand{letter-spacing:-.01em;align-items:center;gap:9px;font-size:17px;font-weight:700;display:inline-flex}.brand-mark{color:var(--accent);flex:none;display:block}.topbar__nav{gap:2px;display:flex}.topbar__spacer{flex:1}.navlink{border-radius:var(--radius);color:var(--fg-muted);align-items:center;gap:7px;padding:6px 11px;font-weight:500;display:inline-flex}.navlink svg{color:var(--fg-faint)}.navlink:hover svg,.navlink--active svg{color:inherit}.navlink:hover{background:var(--surface-2);color:var(--fg)}.navlink--active{color:var(--fg);background:var(--surface-2)}.app-main{flex:1;width:100%;max-width:1040px;margin:0 auto;padding:24px 20px 96px}.study-page{margin-top:-8px}.study-page .page-subtitle{margin-bottom:6px}@media (width>=721px){.app-main:has(.study-page){padding-top:12px}}.bottomnav{display:none}@media (width<=720px){.topbar__nav{display:none}.app-main{padding:16px 14px calc(24px + var(--bottomnav-height) + env(safe-area-inset-bottom))}.bottomnav{height:calc(var(--bottomnav-height) + env(safe-area-inset-bottom));padding-bottom:max(6px, env(safe-area-inset-bottom));border-top:1px solid var(--border);background:var(--surface);z-index:20;display:flex;position:fixed;bottom:0;left:0;right:0}.bottomnav__link{border-radius:var(--radius);color:var(--fg-muted);flex-direction:column;flex:1;justify-content:center;align-items:center;gap:3px;margin:4px;font-size:11px;line-height:1.2;transition:background-color .15s,color .15s;display:flex}.bottomnav__link--active{background:var(--accent-tint);color:var(--accent);font-weight:600}.bottomnav__icon{color:inherit;display:block}}.page-title{margin-bottom:4px;font-size:22px}.page-subtitle{color:var(--fg-muted);margin:0 0 20px;font-size:14px}.section-heading{text-transform:uppercase;letter-spacing:.06em;color:var(--fg-faint);margin:28px 0 12px;font-size:13px;font-weight:600}.btn{border-radius:var(--radius);border:1px solid var(--border-strong);background:var(--surface);color:var(--fg);align-items:center;gap:8px;padding:8px 14px;font-weight:500;display:inline-flex}.btn svg{flex:none}.btn:hover{background:var(--surface-2)}.btn:disabled{opacity:.55;cursor:default}.btn--block{justify-content:center;width:100%}.btn--icon{color:var(--fg-muted);padding:7px}.btn--icon:hover{color:var(--fg)}.spin{animation:.9s linear infinite spin}@keyframes spin{to{transform:rotate(360deg)}}.btn--primary{background:var(--accent);border-color:var(--accent);color:var(--accent-fg)}.btn--primary:hover{background:var(--accent-hover)}.btn--ghost{color:var(--fg-muted);background:0 0;border-color:#0000}.btn--ghost:hover{background:var(--surface-2);color:var(--fg)}.btn--small{padding:5px 10px;font-size:13px}.field{flex-direction:column;gap:6px;margin-bottom:16px;display:flex}.field label{color:var(--fg-muted);font-size:13px;font-weight:500}.field input,.field select,.textarea{border-radius:var(--radius);border:1px solid var(--border-strong);background:var(--surface);color:var(--fg);padding:9px 11px;font-family:inherit;font-size:15px}.field input:focus,.textarea:focus,.field select:focus{outline:2px solid var(--accent);outline-offset:-1px}.form-error{color:var(--error-fg);margin:4px 0 16px;font-size:14px}.form-success{color:var(--accent);margin:4px 0 16px;font-size:14px}.badge{white-space:nowrap;border-radius:999px;align-items:center;gap:4px;padding:2px 9px;font-size:12px;font-weight:600;display:inline-flex}.badge--error{color:var(--error-fg);background:var(--error-bg)}.badge--warning{color:var(--warning-fg);background:var(--warning-bg)}.badge--good{color:var(--good-fg);background:var(--good-bg)}.badge--neutral{color:var(--neutral-fg);background:var(--neutral-bg)}.board-move-badge{z-index:100;border:1px solid color-mix(in srgb, var(--surface) 85%, transparent);pointer-events:none;border-radius:999px;justify-content:center;align-items:center;width:26px;height:26px;font-size:15px;font-weight:800;line-height:1;display:inline-flex;position:absolute;transform:translate(-50%,-50%);box-shadow:0 1px 3px #00000040}.board-move-badge--theory{color:var(--accent-fg);background:var(--accent)}.board-move-badge--out-of-theory{color:var(--warning-fg);background:var(--warning-bg)}.board-move-badge--negative{color:var(--error-fg);background:var(--error-bg)}.board-move-badge--positive{color:var(--good-fg);background:var(--good-bg)}.arrow-legend{max-width:560px;color:var(--fg-muted);margin:10px 0 0 28px;font-size:12px}.arrow-legend__items{grid-template-columns:repeat(2,minmax(0,max-content));gap:5px 12px;margin-top:4px;display:grid}.arrow-legend__items span{align-items:center;gap:5px;display:inline-flex}.arrow-legend__swatch,.arrow-legend__ring{border-radius:999px;width:15px;height:8px;display:inline-block}.arrow-legend__swatch--blue{background:#3f6fa9}.arrow-legend__swatch--green{background:#5a9f56}.arrow-legend__swatch--red{background:#c94c4c}.arrow-legend__ring{background:0 0;border:2px solid #e9a82e}@media (width<=480px){.arrow-legend{margin-left:0}.arrow-legend__items{grid-template-columns:1fr}}.opening-reference{border-bottom:1px solid var(--border);grid-template-columns:1fr auto;gap:3px 10px;margin-bottom:16px;padding-bottom:14px;font-size:13px;display:grid}.opening-reference__label{color:var(--fg-muted);grid-column:1/-1}.opening-reference a{align-self:center;font-size:12px}.sync-bar{flex-wrap:wrap;align-items:center;gap:12px;margin-bottom:8px;display:flex}.sync-status{color:var(--fg-muted);font-size:13px}.sync-history{color:var(--fg-muted);font-size:12px}.sync-history-control{align-items:center;gap:6px;display:inline-flex}.sync-history-control select{border:1px solid var(--border-strong);border-radius:var(--radius);background:var(--surface);min-height:31px;color:var(--fg);font:inherit;padding:4px 7px;font-size:12px}.position-row{border-top:1px solid var(--border);text-align:left;width:100%;color:inherit;background:0 0;border-bottom:none;border-left:none;border-right:none;align-items:center;gap:16px;padding:14px 0;display:flex}.position-row:hover{background:var(--surface-2)}.position-row__mini{flex:none}.position-row__body{flex:1;min-width:0}.position-row__stats{color:var(--fg-muted);margin-top:2px;font-size:13px}.game-row{border-top:1px solid var(--border);text-align:left;width:100%;color:inherit;background:0 0;border-bottom:none;border-left:none;border-right:none;align-items:center;gap:12px;padding:11px 0;display:flex}.game-row:hover{background:var(--surface-2)}.game-row__main{flex:1;min-width:0}.game-row__meta{color:var(--fg-muted);font-size:13px}.game-row__chevron{color:var(--fg-faint);flex:none}.muted{color:var(--fg-muted)}.empty-state{color:var(--fg-muted);text-align:center;padding:24px 0}.empty-state p{margin:0 0 14px}.filters-panel{border:1px solid var(--border);border-radius:var(--radius);background:var(--surface);grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:12px;margin-bottom:8px;padding:14px;display:grid}.filters-panel .field{margin-bottom:0}.analysis-layout{grid-template-columns:minmax(0,1fr) 340px;align-items:start;gap:16px;display:grid}@media (width<=860px){.analysis-layout{grid-template-columns:1fr}}.board-wrap{width:100%;max-width:560px;margin:0 auto;position:relative}.study-page .board-wrap{width:min(100%,560px,100dvh - 206px)}.board-controls{flex-wrap:wrap;justify-content:center;align-items:center;gap:8px;margin-top:12px;display:flex}.movelist{font-variant-numeric:tabular-nums;flex-wrap:wrap;gap:4px 8px;margin-top:12px;display:flex}.movelist__move{color:var(--fg-muted);background:0 0;border:none;border-radius:4px;padding:1px 6px;font-size:14px}.movelist__move--current{background:var(--accent-tint);color:var(--fg);font-weight:600}.panel{border:1px solid var(--border);border-radius:var(--radius);background:var(--surface);padding:18px}.panel__row{border-top:1px solid var(--border);justify-content:space-between;gap:12px;padding:8px 0;font-size:14px;display:flex}.panel__row:first-of-type{border-top:none}.panel__label{color:var(--fg-muted)}.panel__value{text-align:right;font-weight:600}.panel__note{border-left:2px solid var(--accent);background:var(--surface-2);border-radius:0 var(--radius) var(--radius) 0;white-space:pre-wrap;margin-top:12px;padding:10px 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