@import "https://fonts.googleapis.com/css2?family=Inter:ital,wght@0,400;0,500;0,600;0,700;0,800;1,400&family=JetBrains+Mono:wght@400;500;700&display=swap";.chessboard-wrapper{--board-corner-radius:8px;--board-corner-radius-large:10px;--board-corner-radius-base:18px;flex-direction:column;align-items:center;width:100%;display:flex}.chessboard-wrapper.theme-classic{--board-light:#f0d9b5;--board-dark:#b58863;--highlight-from:#9bc70069;--highlight-to:#9bc70069;--selected:#14551e80;--legal-dot:#0000001f;--legal-capture:#14551e4d;--check:#ff000080;--knight-aura:#6299241f}.chessboard-wrapper.theme-slate{--board-light:#dee3e6;--board-dark:#8ca2ad;--highlight-from:#9bc70069;--highlight-to:#9bc70069;--selected:#14551e80;--legal-dot:#0000001a;--legal-capture:#14551e4d;--check:#ff000080;--knight-aura:#62992426}.chessboard-wrapper.theme-rosewood{--board-light:#f0d2b4;--board-dark:#b06040;--highlight-from:#9bc70069;--highlight-to:#9bc70069;--selected:#14551e80;--legal-dot:#0000001f;--legal-capture:#14551e4d;--check:#ff000080;--knight-aura:#6299241f}.board-surface{box-sizing:border-box;border-radius:var(--board-corner-radius);width:100%;max-width:580px;margin:0 auto;position:relative;overflow:hidden;box-shadow:0 0 0 1px #00000080,0 8px 48px #000000b3}.chessboard-wrapper:not(.board--3d) .board-surface{border-radius:var(--board-corner-radius);box-shadow:0 0 0 1px #ffffff0d,0 12px 28px #00000047}.chessboard-wrapper:not(.board--3d) .board-grid{border-radius:var(--board-corner-radius);overflow:hidden}.chessboard-wrapper:not(.board--3d) .square:hover .piece-image{filter:drop-shadow(0 5px 8px #00000047);transform:translateY(-1px)scale(1.03)}.chessboard-wrapper:not(.board--3d) .square--holding .piece-image,.chessboard-wrapper:not(.board--3d) .square--holding:hover .piece-image{filter:drop-shadow(0 7px 10px #0000004d);transform:translateY(-2px)scale(1.05)}.board-grid{grid-template-rows:repeat(8,1fr);grid-template-columns:repeat(8,1fr);gap:0;width:100%;display:grid}.square{aspect-ratio:1;cursor:pointer;-webkit-user-select:none;user-select:none;touch-action:manipulation;background:0 0;border:none;outline:none;justify-content:center;align-items:center;width:100%;padding:0;display:flex;position:relative}.square--light{background:var(--board-light)}.square--dark{background:var(--board-dark)}.square--selected{background:var(--selected)!important}.square--selected.square--light{background:color-mix(in srgb, var(--board-light) 60%, var(--selected))!important}.square--selected.square--dark{background:color-mix(in srgb, var(--board-dark) 60%, var(--selected))!important}.square--last-from,.square--last-to{position:relative}.square--last-from:before,.square--last-to:before{content:"";background:var(--highlight-to);pointer-events:none;z-index:1;position:absolute;inset:0}.square--legal{cursor:pointer}.square--legal:after{content:"";background:var(--legal-dot);pointer-events:none;z-index:2;border-radius:50%;width:28%;height:28%;position:absolute}.square--capture:after{content:"";border:3px solid var(--legal-capture);pointer-events:none;z-index:2;background:0 0;border-radius:50%;width:80%;height:80%;position:absolute}.square--aura{position:relative}.square--aura:before{content:"";background:var(--knight-aura);pointer-events:none;z-index:0;position:absolute;inset:0}.square--check{position:relative}.square--check:before{content:"";pointer-events:none;z-index:1;background:radial-gradient(#f009 0%,#f003 40%,#0000 68%);position:absolute;inset:0}.piece-shell{pointer-events:none;z-index:3;justify-content:center;align-items:center;width:100%;height:100%;display:flex;position:relative}.piece-shell--aura:before{content:"";z-index:0;background:radial-gradient(circle,#ceea8657 0%,#62992429 42%,#0000 74%);border-radius:50%;position:absolute;inset:14%;box-shadow:0 0 14px #6299242e}.piece-image{pointer-events:none;filter:drop-shadow(0 1px 2px #0000004d);z-index:3;width:85%;height:85%;transition:transform .2s,filter .2s,opacity .2s;position:relative}.square:hover .piece-image{filter:drop-shadow(0 3px 5px #00000073);transform:scale(1.05)}.piece-shell--aura .piece-image{filter:drop-shadow(0 0 5px #ceea8680)drop-shadow(0 2px 4px #00000057);transform:translateY(-1px)scale(1.035)}.square:hover .piece-shell--aura .piece-image{filter:drop-shadow(0 0 7px #d8f4949e)drop-shadow(0 3px 5px #0000006b);transform:translateY(-2px)scale(1.08)}.piece{text-transform:uppercase;z-index:3;border:2px solid #0000004d;border-radius:50%;place-items:center;width:80%;height:80%;font-size:clamp(14px,3vmin,24px);font-weight:700;transition:transform .1s,box-shadow .1s,border-color .1s;display:grid;position:relative}.piece--w{color:#333;background:#fff;box-shadow:inset 0 2px 4px #fff6,0 2px 4px #0003}.piece--b{color:#f0f0f0;background:#333;box-shadow:inset 0 2px 4px #ffffff1a,0 2px 4px #0000004d}.piece-shell--aura .piece{transform:translateY(-1px)scale(1.035)}.piece-shell--aura .piece--w{border-color:#629924b8;box-shadow:inset 0 2px 4px #fff6,0 0 0 2px #ceea8659,0 4px 10px #4668163d}.piece-shell--aura .piece--b{border-color:#d8f494b3;box-shadow:inset 0 2px 4px #ffffff1a,0 0 0 2px #8cc03c57,0 4px 10px #00000057}.square:hover .piece-shell--aura .piece{transform:translateY(-2px)scale(1.08)}.piece-aura-mark{color:#efffc4;text-shadow:0 0 6px #e2ff9f99;z-index:4;background:#2c490feb;border-radius:999px;place-items:center;width:18%;min-width:11px;height:18%;min-height:11px;font-size:clamp(8px,1.45vmin,12px);line-height:1;display:grid;position:absolute;top:12%;right:12%;box-shadow:0 0 0 1px #e2ff9f61,0 0 10px #a0d64473}.file-label,.rank-label{letter-spacing:0;text-transform:lowercase;pointer-events:none;z-index:4;font-size:9px;font-weight:700;line-height:1;position:absolute}.square--light .file-label,.square--light .rank-label{color:var(--board-dark);opacity:.7}.square--dark .file-label,.square--dark .rank-label{color:var(--board-light);opacity:.7}.file-label{bottom:2px;right:3px}.rank-label{top:2px;left:3px}.chessboard-wrapper.board--3d .board-surface{perspective:1100px;perspective-origin:50% 10%;box-shadow:none;overflow:visible}.chessboard-wrapper.board--3d .board-grid{transform-style:preserve-3d;border-radius:var(--board-corner-radius);transition:transform .5s cubic-bezier(.34,1.56,.64,1);transform:rotateX(16deg);box-shadow:0 40px 90px #000000d9,0 10px 24px #0000008c}.chessboard-wrapper.board--3d .piece-shell{transform-style:preserve-3d}.chessboard-wrapper.board--3d .piece-image{filter:drop-shadow(0 2px 2px #ffffff24)drop-shadow(0 7px 12px #00000075);width:88%;height:88%}.chessboard-wrapper.board--3d .square--occupied .piece-image{transform:translateZ(10px)}.chessboard-wrapper.board--3d .square--last-to .piece-image,.chessboard-wrapper.board--3d .square--last-to .piece{animation:.38s cubic-bezier(.22,1,.36,1) forwards piece-land-3d}@keyframes piece-land-3d{0%{opacity:.5;transform:translateY(-22px)scale(1.18)}60%{opacity:1;transform:translateY(2px)scale(1.04)}to{opacity:1;transform:translateY(0)scale(1)}}.chessboard-wrapper.board--3d .square:hover .piece-image{filter:drop-shadow(0 3px 3px #ffffff2e)drop-shadow(0 10px 14px #00000094);transform:translateY(-3px)translateZ(16px)scale(1.05)}.chessboard-wrapper.board--3d .square--holding .piece-image,.chessboard-wrapper.board--3d .square--holding:hover .piece-image{filter:drop-shadow(0 4px 4px #ffffff38)drop-shadow(0 11px 16px #0000009e);transform:translateY(-4px)translateZ(20px)scale(1.06)}.chessboard-wrapper.board--realistic .board-surface{filter:drop-shadow(0 20px 40px #00000075)}.chessboard-wrapper.board--realistic .board-grid{border-radius:var(--board-corner-radius-large);overflow:hidden;transform:rotateX(24deg)rotate(-.4deg);box-shadow:0 55px 85px #000000c7,0 18px 32px #0006,inset 0 0 0 1px #ffffff14}.chessboard-wrapper.board--realistic .board-surface:before{content:"";border-radius:0 0 var(--board-corner-radius-base) var(--board-corner-radius-base);background:linear-gradient(180deg, color-mix(in srgb, var(--board-dark) 78%, #3b2417), color-mix(in srgb, var(--board-dark) 52%, #170f09)), linear-gradient(90deg, #ffffff14, transparent 18%, transparent 82%, #00000029);transform-origin:top;pointer-events:none;height:26px;position:absolute;top:100%;left:2.5%;right:2.5%;transform:translateY(-10px)perspective(500px)rotateX(-58deg);box-shadow:0 18px 24px #00000057}.chessboard-wrapper.board--realistic .board-surface:after{content:"";filter:blur(5px);pointer-events:none;background:radial-gradient(#00000057,#0000);border-radius:999px;height:18px;position:absolute;top:calc(100% + 8px);left:8%;right:8%}.chessboard-wrapper.board--realistic .board-grid:before{content:"";pointer-events:none;background:linear-gradient(180deg, #ffffff2e, transparent 20%, transparent 70%, #00000038), repeating-linear-gradient(90deg, color-mix(in srgb, var(--board-dark) 32%, transparent) 0 8px, color-mix(in srgb, var(--board-light) 18%, transparent) 8px 16px);mix-blend-mode:soft-light;z-index:1;position:absolute;inset:0}.chessboard-wrapper.board--realistic .board-grid:after{content:"";pointer-events:none;box-shadow:inset 0 0 0 10px color-mix(in srgb, var(--board-dark) 38%, transparent), inset 0 0 0 1px #ffffff0f;z-index:1;position:absolute;inset:0}.chessboard-wrapper.board--realistic .square--light{background:linear-gradient(135deg, #ffffff29, transparent 50%), linear-gradient(135deg, color-mix(in srgb, var(--board-light) 88%, #fff4df), color-mix(in srgb, var(--board-light) 76%, var(--board-dark)))}.chessboard-wrapper.board--realistic .square--dark{background:linear-gradient(135deg, #ffffff14, transparent 48%), linear-gradient(135deg, color-mix(in srgb, var(--board-dark) 90%, #cf9d70), color-mix(in srgb, var(--board-dark) 68%, #2d1a10))}.chessboard-wrapper.board--realistic .piece-image{filter:drop-shadow(0 1px #ffffff38)drop-shadow(0 6px 6px #00000042)drop-shadow(0 14px 18px #0000006b);width:90%;height:90%}.chessboard-wrapper.board--realistic .square--occupied .piece-image{transform:translateZ(16px)scale(1.02)}.chessboard-wrapper.board--realistic .square--occupied .piece-shell{transform:translateZ(2px)}.chessboard-wrapper.board--realistic .square--last-from{box-shadow:inset 0 0 0 999px color-mix(in srgb, var(--board-dark) 20%, transparent)}.chessboard-wrapper.board--realistic .square--last-to{box-shadow:inset 0 0 0 999px color-mix(in srgb, var(--board-light) 26%, #c7a34d)}.chessboard-wrapper.board--realistic .square:hover .piece-image{filter:drop-shadow(0 2px #ffffff3d)drop-shadow(0 10px 12px #00000047)drop-shadow(0 20px 22px #00000075);transform:translateY(-4px)translateZ(24px)scale(1.08)}.chessboard-wrapper.board--realistic .square--holding .piece-image,.chessboard-wrapper.board--realistic .square--holding:hover .piece-image{transform:translateY(-5px)translateZ(26px)scale(1.1)}.chessboard-wrapper.board--realistic .square--selected{box-shadow:inset 0 0 0 2px color-mix(in srgb, var(--board-light) 58%, #fff3c2), inset 0 0 28px color-mix(in srgb, var(--board-light) 18%, #d7b049)}.chessboard-wrapper.board--realistic .square--legal:after{background:color-mix(in srgb, var(--board-dark) 34%, transparent)}.chessboard-wrapper.board--realistic .square--capture:after{border-color:color-mix(in srgb, var(--board-dark) 38%, #7b2018)}.chessboard-wrapper.board--realistic .board-hand{filter:sepia(.12)saturate(.72)brightness(1.02)drop-shadow(0 14px 18px #00000061)}.chessboard-wrapper.board--realistic .board-hand-piece,.chessboard-wrapper.board--realistic .board-move-piece{filter:drop-shadow(0 1px #ffffff38)drop-shadow(0 5px 8px #0000004d)drop-shadow(0 12px 16px #00000061)}.board-hand-overlay{pointer-events:none;z-index:8;position:absolute;inset:0}.board-hand-carry{left:var(--hand-x);top:var(--hand-y);opacity:1;width:0;height:0;transition:opacity .12s ease-out;position:absolute}.board-hand-overlay--move .board-hand-carry{opacity:1}.board-move-piece{left:var(--hand-x);top:var(--hand-y);filter:drop-shadow(0 3px 4px #0000006b);width:42px;height:42px;margin-top:-21px;margin-left:-21px;position:absolute}.board-move-piece.board-hand-piece--text{border-width:2px;width:42px;min-width:42px;height:42px;min-height:42px;font-size:1rem;line-height:1}.board-move-piece--move{transition:transform 50ms linear;top:0;left:0;transform:scale(1.05)}.board-hand{left:var(--hand-x);top:var(--hand-y);filter:drop-shadow(0 12px 18px #00000059);transform-origin:30% 28%;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 64 64'%3E%3Cdefs%3E%3CradialGradient id='bg' cx='35%25' cy='30%25' r='75%25'%3E%3Cstop offset='0%25' stop-color='%23f6f9fd'/%3E%3Cstop offset='56%25' stop-color='%23c2ccd7'/%3E%3Cstop offset='100%25' stop-color='%23727c88'/%3E%3C/radialGradient%3E%3C/defs%3E%3Cpath d='M19 56c-6.4 0-11.5-5-11.5-11.4V31.5c0-2.6 2.1-4.7 4.7-4.7s4.7 2.1 4.7 4.7V19.7c0-2.8 2.3-5.1 5.1-5.1s5.1 2.3 5.1 5.1V30h2V16.4c0-2.8 2.3-5.1 5.1-5.1s5.1 2.3 5.1 5.1V30h2V18.8c0-2.8 2.3-5.1 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linear;top:0;left:0;transform:rotate(-8deg)scale(1)}.board-hand-piece--move{margin-left:calc(-21px + var(--piece-grip-x,-5px));margin-top:calc(-4px + var(--piece-grip-y,1px));transition:transform 50ms linear;top:0;left:0;transform:scale(1.05)}.board-hand-overlay--active .board-hand--move{transform:translateY(0) rotate(var(--hand-tilt,-2deg)) scale(1)}.board-hand-overlay--active .board-hand-piece--move,.board-hand-overlay--active .board-move-piece--move{transform:translateY(0) rotate(var(--piece-tilt,0deg)) scale(var(--piece-scale,1))}.board-captured-piece{filter:drop-shadow(0 5px 7px #00000059);width:42px;height:42px;margin-top:-21px;margin-left:-21px;position:absolute}.board-captured-piece.board-hand-piece--text{margin-top:-21px;margin-left:-21px}.board-captured-piece--throw{opacity:0;transform:translateY(0) rotate(var(--piece-tilt,0deg)) scale(.98);top:0;left:0}.board-captured-piece--active{animation:.58s cubic-bezier(.16,.9,.24,1) .8s forwards captured-throw-side}@keyframes hand-idle{0%{transform:translate(0,0)rotate(-7deg)}to{transform:translate(2px,-2px)rotate(-3deg)}}@keyframes hand-piece-idle{0%{transform:translate(0,0)scale(1.02)}to{transform:translate(2px,-1px)scale(1.03)}}@keyframes captured-throw-side{0%{transform:translate3d(0, 0, 0) rotate(var(--piece-tilt,0deg)) scale(.98);opacity:0}8%{opacity:1}22%{transform:translate3d(10px, calc((var(--carry-lift,10px) + 14px) * -1), 0) rotate(12deg) scale(1.04);opacity:1}to{transform:translate3d(var(--drop-x), var(--drop-y), 0) rotate(26deg) scale(.74);opacity:0}}@media (width<=520px){.board-surface{max-width:100%}.piece-image{width:90%;height:90%}.file-label,.rank-label{font-size:7px}}.left-bg-art{opacity:.08;pointer-events:none;z-index:0;background:url(/riderchess.png) 50%/contain no-repeat;width:calc(50vw - 580px);position:fixed;top:0;bottom:0;left:0}.season-decor{pointer-events:none;z-index:1;position:fixed;inset:60px 0 0;overflow:hidden}.season-decor__item{opacity:0;transform:translate3d(0, 0, 0) scale(var(--season-scale,1));place-items:center;font-size:1.15rem;animation-name:seasonal-fall;animation-timing-function:linear;animation-iteration-count:infinite;display:inline-grid;position:absolute;top:-10%}.season-decor--winter .season-decor__item{color:#e6f2ffb3;text-shadow:0 0 10px #c8e6ff40}.season-decor--spring .season-decor__item{color:#ffc4df99;text-shadow:0 0 12px #ffc4df33}.season-decor--summer .season-decor__item{color:#ffe27880;text-shadow:0 0 14px #ffe27847}.season-decor--autumn .season-decor__item{color:#e6a25480;text-shadow:0 0 12px #e6a25433}@keyframes seasonal-fall{0%{transform:translate3d(0, -6vh, 0) rotate(0deg) scale(var(--season-scale,1));opacity:0}10%{opacity:1}85%{opacity:.75}to{transform:translate3d(var(--season-drift,0px), 112vh, 0) rotate(220deg) scale(var(--season-scale,1));opacity:0}}.top-bar{background:var(--bg-header);border-bottom:1px solid var(--border-subtle);z-index:100;justify-content:space-between;align-items:center;height:60px;padding:0 24px;display:flex;position:sticky;top:0}.brand{align-items:center;gap:12px;display:flex}.brand-text{flex-direction:column;gap:2px;display:flex}.brand h1{color:var(--text-white);letter-spacing:-.04em;margin:0;font-size:1.35rem;font-weight:800;line-height:1.1}.brand-subtitle{color:var(--accent-bright);letter-spacing:.01em;margin:0;font-size:.7rem;font-weight:500;line-height:1}.brand-logo{border-radius:var(--radius-sm);width:auto;height:30px;transition:box-shadow var(--transition-base)}.brand-logo:hover{box-shadow:0 0 0 2px var(--accent)}.auth-panel{align-items:center;gap:10px;display:flex}.auth-actions{gap:8px;display:flex}.auth-form{flex-direction:column;gap:8px;min-width:min(420px,48vw);display:flex}.auth-mode-toggle{gap:6px;display:inline-flex}.auth-mode-btn{border:1px solid var(--border);background:var(--bg-panel);color:var(--text-dim);cursor:pointer;border-radius:999px;padding:5px 10px;font-size:.74rem;font-weight:700}.auth-mode-btn.active{border-color:var(--accent);color:var(--accent-bright);background:var(--accent-glow)}.auth-form-row{gap:8px;display:flex}.auth-input{flex:1;min-width:0}.auth-error{color:#ff8f8f;font-size:.75rem}.signin-page{place-items:center;min-height:calc(100vh - 60px);padding:28px 16px;display:grid}.signin-card{border-radius:var(--radius-lg);border:1px solid var(--border-subtle);background:linear-gradient(#ffffff08,#ffffff03);width:min(560px,100%);padding:28px;box-shadow:0 20px 48px #0000003d}.signin-back-btn,.signin-hero{margin-bottom:18px}.signin-hero h2{color:var(--text-bright);margin:0 0 8px;font-size:1.5rem}.signin-hero p{color:var(--text-dim);margin:0;line-height:1.55}.signin-form{min-width:0}.page-loading{place-items:center;min-height:calc(100vh - 60px);padding:24px;display:grid}.home-page{background:radial-gradient(80% 40% at 50% 0,#4a90d90f,#0000 70%),0 0;width:min(1080px,100%);margin:0 auto;padding:56px 28px 60px}.home-hero{grid-template-columns:1fr;align-items:start;gap:28px;display:grid}.home-hero--signed-in{grid-template-columns:minmax(0,1.15fr) minmax(320px,380px);gap:48px}.home-hero-copy{text-align:left;flex-direction:column;gap:18px;display:flex}.home-hero-eyebrow{font-family:var(--font-mono);letter-spacing:.18em;text-transform:uppercase;color:var(--accent-bright);align-items:center;gap:10px;font-size:.72rem;display:inline-flex}.home-hero-eyebrow:before{content:"";background:var(--accent-bright);opacity:.7;width:22px;height:1px}.home-hero h2{letter-spacing:-.02em;max-width:18ch;color:var(--text-bright);margin:0;font-size:clamp(2rem,4.2vw,3.2rem);font-weight:800;line-height:1.05}.home-hero h2 em{color:var(--accent-bright);font-style:normal}.home-summary{max-width:56ch;color:var(--text-muted);margin:0;font-size:1.05rem;line-height:1.55}.home-actions{flex-wrap:wrap;gap:10px;margin-top:4px;display:flex}.home-cta{padding:12px 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