/* Chess Openings — responsive editorial UI. No fonts, libraries or network required. */
:root{color-scheme:dark;--bg:#101617;--panel:#1b2525;--border:#35443f;--lime:#dcf08c;--muted:#a4b2a8;--white:#f4f3e9;--light-square:#f2f0e6;--dark-square:#809185;--font:Inter,ui-sans-serif,system-ui,-apple-system,'Segoe UI',sans-serif}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--white);font-family:var(--font);min-width:300px;-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}button{font-family:inherit;cursor:pointer}a:focus-visible,button:focus-visible,[role=button]:focus-visible{outline:2px solid var(--lime);outline-offset:4px}::selection{background:var(--lime);color:#172317}.shell{max-width:1160px;padding-left:38px;padding-right:38px;margin:auto}.noise-bg{position:fixed;inset:0;z-index:-1;pointer-events:none;background:radial-gradient(ellipse at 100% 5%,#23382c24,transparent 44%),radial-gradient(ellipse at 4% 85%,#23362c25,transparent 32%)}
.masthead{border-bottom:1px solid var(--border);background:#101617f1}.nav{display:flex;align-items:center;justify-content:space-between;min-height:80px;gap:20px}.brand{display:flex;align-items:center;gap:13px;font-size:14px;font-weight:850;letter-spacing:.09em;white-space:nowrap}.brand-name span{color:var(--lime)}.brand-mark{display:grid;place-items:center;height:41px;width:41px;border:1px solid #9cb076;border-radius:10px;color:var(--lime);font-family:Georgia,serif;font-size:29px;font-weight:400;line-height:1}.nav-right{display:flex;align-items:center;gap:25px}.nav-right a{font-size:12px;color:#c1cec2;transition:color .15s}.nav-right a:hover,.nav-right .current{color:var(--lime)}.nav-index{padding:9px 13px;border:1px solid #415145;border-radius:30px;font-size:10px;color:#a5b5a6;font-weight:800;white-space:nowrap;letter-spacing:.1em}
.eyebrow,.mini,.eyelabel{display:block;color:var(--lime);font-size:11px;font-weight:800;text-transform:uppercase;letter-spacing:.17em}.eyebrow:before,.mini:before{content:'—';margin-right:10px}.hero{display:grid;grid-template-columns:1.02fr .98fr;align-items:center;gap:30px;padding-top:87px;padding-bottom:91px}.hero-copy h1{font-size:clamp(55px,7vw,96px);letter-spacing:-.08em;line-height:1.02;font-weight:590;margin:25px 0}.hero-copy h1 em{display:block;color:var(--lime);font-family:Georgia,serif;font-weight:400;font-style:italic;letter-spacing:-.06em;white-space:nowrap}.hero-copy>p{color:var(--muted);font-size:15px;line-height:1.86;max-width:430px}.hero-actions{display:flex;align-items:center;flex-wrap:wrap;gap:20px;margin-top:30px}.button-primary{display:inline-flex;align-items:center;gap:18px;border-radius:10px;background:var(--lime);border:1px solid var(--lime);color:#1d271c;padding:15px 21px;font-size:13px;font-weight:800;transition:transform .2s,background .2s}.button-primary:hover{transform:translateY(-3px);background:#ecffab}.quiet-caption{font-size:11px;color:#8fa397;line-height:1.7}.hero-visual{position:relative;isolation:isolate;padding:30px}.orbit{position:absolute;border:1px solid #5e735138;border-radius:50%;inset:10%;transform:scale(1.35) rotate(25deg);pointer-events:none}.orbit.two{transform:scale(1.18) rotate(-22deg);border-color:#4c6b4a3c}.hero-board-panel{max-width:420px;margin:auto;position:relative;background:#202d2a;border:1px solid #4a5b4e;border-radius:14px;padding:18px;transform:rotate(3deg);box-shadow:0 27px 45px #0007;transition:transform .2s,border-color .2s;cursor:pointer}.hero-board-panel:hover{transform:rotate(1deg) translateY(-5px);border-color:var(--lime)}.micro-label{display:flex;align-items:center;justify-content:space-between;font-size:10px;font-weight:800;letter-spacing:.11em;color:#c3d5c0;margin-bottom:15px}.micro-dot{color:var(--lime)}.hero-caption{display:flex;align-items:center;justify-content:space-between;padding-top:15px;gap:10px;font-size:12px}.hero-caption small{color:var(--lime);font-weight:800;font-size:14px}
.board{display:grid;grid-template-columns:repeat(8,minmax(0,1fr));aspect-ratio:1;width:100%;border:4px solid #384b3d;overflow:hidden;touch-action:manipulation}.square{min-width:0;min-height:0;position:relative;display:grid;place-items:center;aspect-ratio:1}.square.light{background:var(--light-square)}.square.dark{background:var(--dark-square)}.square.last-move:before{content:'';position:absolute;inset:0;background:#dcf08c7b;z-index:0}.piece{position:absolute;inset:0;display:grid;place-items:center;font-family:'DejaVu Sans','Segoe UI Symbol','Noto Sans Symbols 2',sans-serif;font-weight:400;font-size:clamp(19px,3.8vw,45px);line-height:1;user-select:none;z-index:1}.piece.white{color:#fffef6;text-shadow:0 2px 2px #313f35,1px 0 #4f5c53,-1px 0 #4f5c53,0 -1px #4f5c53}.piece.black{color:#182522;text-shadow:0 1px 1px #f1f0e452}.piece.is-moving{z-index:8;transition:transform .39s cubic-bezier(.2,.76,.29,.98);will-change:transform}.coordinate{position:absolute;font-size:clamp(6px,.85vw,9px);font-weight:900;z-index:2;line-height:1;pointer-events:none}.rank-coordinate{top:3px;left:3px}.file-coordinate{bottom:3px;right:3px}.light .coordinate{color:#526b5c}.dark .coordinate{color:#e6eddf}
.section-head{display:flex;justify-content:space-between;align-items:end;gap:25px;border-bottom:1px solid var(--border);padding-bottom:26px}.section-head h2{font-size:clamp(30px,4vw,47px);font-weight:580;letter-spacing:-.064em;margin:10px 0 0}.section-head p{font-size:13px;line-height:1.8;color:var(--muted);max-width:285px;margin:0}.card-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;padding:25px 0 30px}.opening-card{display:flex;justify-content:space-between;gap:13px;min-height:245px;padding:26px;background:linear-gradient(125deg,#202c29,#151f1e);border:1px solid var(--border);border-radius:14px;transition:transform .2s,border-color .2s,background .2s;overflow:hidden}.opening-card:hover{transform:translateY(-4px);border-color:var(--lime);background:linear-gradient(125deg,#293a2f,#192421)}.opening-card:first-child{grid-column:span 2;min-height:260px;background:linear-gradient(118deg,#293a30,#182422)}.opening-card-copy{display:flex;flex-direction:column;align-items:start;min-width:0;flex:1}.card-number{font-size:10px;font-weight:650;letter-spacing:.13em;color:#a2b4a4}.card-number b{color:var(--lime)}.card-number span{margin-left:6px}.card-move{font:29px Georgia,serif;color:var(--lime);margin-top:19px}.opening-card h3{font-size:clamp(23px,2.7vw,34px);font-weight:580;letter-spacing:-.055em;margin:7px 0}.opening-card p{color:var(--muted);font-size:13px;line-height:1.6;max-width:350px;margin:0 0 17px}.card-more{color:var(--lime);font-size:12px;font-weight:750;margin-top:auto}.card-miniature{width:29%;max-width:170px;flex-shrink:0;align-self:center;transform:rotate(4deg);box-shadow:5px 12px 16px #0005}.opening-card:first-child .card-miniature{max-width:220px}.mini-board{border-width:4px}.mini-board .piece{font-size:clamp(12px,2.3vw,23px)}.mini-board .coordinate{font-size:6px}.bottom-banner{display:flex;justify-content:space-between;align-items:center;gap:20px;background:#1b2826;border:1px solid var(--border);border-radius:13px;padding:27px 30px;margin:30px 0 75px}.bottom-banner strong{font-size:20px;font-weight:600;letter-spacing:-.035em}.bottom-banner p{font-size:13px;line-height:1.7;color:var(--muted);margin:8px 0 0}.banner-mark{font-size:58px;font-family:Georgia,serif;color:var(--lime)}.footer{border-top:1px solid var(--border);padding-top:24px;padding-bottom:30px;color:#9ab0a0;display:flex;justify-content:space-between;gap:14px;font-size:11px}.footer b,.footer span{color:var(--lime)}.footer a:hover{color:var(--lime)}
/* Opening pages */
.breadcrumb{display:flex;align-items:center;gap:10px;font-size:12px;color:#95a899;padding-top:35px;padding-bottom:33px}.breadcrumb a:hover{color:var(--lime)}.breadcrumb b{color:var(--lime);font-weight:550}.detail-heading{display:flex;align-items:end;justify-content:space-between;gap:25px;margin-bottom:32px}.detail-heading h1{font-size:clamp(43px,6.1vw,77px);line-height:1.04;letter-spacing:-.075em;font-weight:590;margin:14px 0 19px}.detail-heading h1 em{font-family:Georgia,serif;color:var(--lime);font-size:.62em;font-weight:400;font-style:italic;letter-spacing:-.045em;display:block;margin-top:11px}.detail-heading p{max-width:625px;font-size:14px;line-height:1.85;color:var(--muted);margin:0}.big-move{font:clamp(45px,6.5vw,80px) Georgia,serif;color:var(--lime);white-space:nowrap}.detail-layout{display:grid;grid-template-columns:1.05fr .95fr;gap:19px}.board-surface,.story-surface{background:var(--panel);border:1px solid var(--border);border-radius:14px;padding:22px;min-width:0}.stage-top{display:flex;justify-content:space-between;gap:10px;color:#bdcec0;font-size:10px;font-weight:800;letter-spacing:.11em;margin-bottom:17px}.stage-top .live{color:var(--lime)}.board-wrap{max-width:535px;margin:0 auto}.board-wrap .piece{font-size:clamp(19px,4vw,49px)}.turn-indicator{display:flex;justify-content:space-between;align-items:center;gap:10px;padding:17px 1px 0;font-size:12px;color:var(--muted)}.turn-indicator strong{font-size:13px;color:#f1f3e9}.controls{display:flex;gap:9px;margin-top:15px}.control{background:#2b3a33;border:1px solid #45564b;color:#eef3e9;border-radius:9px;padding:14px 6px;font-size:12px;font-weight:800;flex:1;transition:background .15s,border-color .15s}.control:not(:disabled):hover{border-color:var(--lime);background:#324b38}.control.primary{background:var(--lime);color:#17231c;border-color:var(--lime);flex:1.5}.control.primary:hover{background:#efffb2}.control:last-child{flex:.4}.control:disabled{opacity:.35;cursor:default}.eyelabel{font-size:10px}.story-surface h2{font-size:clamp(23px,2.5vw,33px);font-weight:580;letter-spacing:-.05em;line-height:1.2;margin:17px 0 12px}.story-surface p,.fact-box dd{font-size:13px;line-height:1.75;color:var(--muted)}.story-surface .lead{margin:0}.section-divider{height:1px;border:0;background:var(--border);margin:27px 0}.move-strip{display:flex;flex-wrap:wrap;gap:7px;margin-top:15px}.move-chip{background:#29392f;border:1px solid #465b4b;color:#e0e9da;border-radius:7px;padding:9px 11px;font-size:12px;font-weight:750;transition:background .15s}.move-chip:hover{border-color:var(--lime)}.move-chip.active{background:var(--lime);color:#1b281d;border-color:var(--lime)}.step-panel{background:#25352d;border:1px solid #425948;border-radius:11px;padding:21px;margin-top:19px;min-height:169px}.step-count{color:var(--lime);font-size:10px;letter-spacing:.16em;font-weight:850}.step-panel h3{font-size:24px;letter-spacing:-.045em;font-weight:580;margin:13px 0 8px}.step-panel p{margin:0}.fact-box{margin-top:22px}.fact-box dl{margin:0}.fact-box dt{font-size:11px;font-weight:800;color:var(--lime);letter-spacing:.11em;text-transform:uppercase;margin-bottom:9px}.fact-box dd{margin:0}.detail-layout+.quiet-caption{padding-top:17px}.footnav{display:flex;gap:15px;margin:26px 0 65px}.footnav a{flex:1;display:block;background:#1b2826;border:1px solid var(--border);border-radius:11px;padding:18px;transition:border-color .2s}.footnav a:hover{border-color:var(--lime)}.footnav a:last-child{text-align:right}.footnav small{font-size:10px;color:var(--muted);font-weight:800;letter-spacing:.1em;display:block;margin-bottom:8px}.footnav strong{color:var(--lime);font-size:14px}
@media(max-width:980px){.shell{padding-left:24px;padding-right:24px}.hero{padding-top:65px;padding-bottom:75px}.hero-copy h1{font-size:clamp(48px,7vw,70px)}.nav-right{gap:15px}.hero-visual{padding:15px}.detail-layout{gap:13px}.board-surface,.story-surface{padding:16px}.controls{gap:5px}.control{font-size:11px;padding:12px 3px}}
@media(max-width:760px){.nav{min-height:68px}.brand{font-size:12px;gap:9px}.brand-mark{width:36px;height:36px;font-size:26px}.nav-right{gap:12px}.nav-right a{font-size:11px}.nav-index{display:none}.hero{grid-template-columns:1fr;gap:25px;padding-top:54px;padding-bottom:68px}.hero-copy h1{font-size:clamp(50px,10.5vw,84px)}.hero-visual{max-width:470px;width:90%;justify-self:center}.hero-board-panel .piece{font-size:clamp(22px,7vw,42px)}.detail-layout{grid-template-columns:1fr}.detail-heading{align-items:start}.detail-heading h1{font-size:clamp(40px,8vw,62px)}.big-move{font-size:clamp(30px,5.5vw,44px)}.board-wrap .piece{font-size:clamp(24px,7vw,52px)}.section-head p{max-width:230px}.opening-card{padding:18px;min-height:210px}.opening-card p{font-size:12px}.card-miniature{max-width:126px}.mini-board .piece{font-size:clamp(11px,2.6vw,20px)}}
@media(max-width:540px){.shell{padding-left:18px;padding-right:18px}.nav-right{gap:12px}.nav-right a[href$="#about"]{display:none}.hero-copy h1{font-size:clamp(43px,11.5vw,63px)}.hero-copy>p{font-size:14px}.hero-visual{width:97%}.section-head{display:block}.section-head p{margin-top:13px;max-width:none}.card-grid{grid-template-columns:1fr}.opening-card:first-child{grid-column:span 1;min-height:225px}.opening-card{min-height:215px}.opening-card h3{font-size:25px}.opening-card .card-miniature{max-width:135px;width:32%}.mini-board .piece{font-size:clamp(10px,3.8vw,19px)}.bottom-banner{padding:20px 19px;margin-bottom:50px}.bottom-banner strong{font-size:18px}.bottom-banner p{font-size:12px}.banner-mark{font-size:42px}.footer{flex-direction:column;gap:7px}.breadcrumb{padding-top:25px;padding-bottom:25px}.detail-heading{display:block;margin-bottom:25px}.detail-heading h1{font-size:clamp(40px,10vw,59px)}.detail-heading h1 em{font-size:.72em}.detail-heading p{font-size:13px}.big-move{font-size:35px;margin-top:15px}.board-surface,.story-surface{padding:15px}.board-wrap .piece{font-size:clamp(22px,8vw,43px)}.coordinate{font-size:7px}.footnav{gap:10px}.footnav a{padding:13px}.footnav strong{font-size:12px}.control{font-size:10px}.story-surface h2{font-size:27px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{transition:none!important;animation:none!important}}