:root{--color-primary: #22d3ee;--color-primary-hover: #06b6d4;--color-primary-light: rgba(34, 211, 238, .1);--color-primary-muted: rgba(34, 211, 238, .3);--color-background: #0f1419;--color-background-secondary: #1a1f2e;--color-background-tertiary: #252b3b;--color-background-elevated: #2d3548;--color-surface: #1a1f2e;--color-surface-hover: #252b3b;--color-surface-elevated: #2d3548;--color-text: #e2e8f0;--color-text-secondary: #94a3b8;--color-text-muted: #64748b;--color-text-disabled: #475569;--color-border: #2d3548;--color-border-hover: #3d4557;--color-border-focus: var(--color-primary);--color-chess-light: #f0d9b5;--color-chess-dark: #b58863;--color-chess-highlight: rgba(186, 202, 68, .6);--color-chess-selected: rgba(186, 202, 68, .8);--color-chess-check: rgba(239, 68, 68, .6);--color-chess-hint: rgba(100, 116, 139, .3);--color-bullet: #ef4444;--color-bullet-hover: #dc2626;--color-blitz: #f59e0b;--color-blitz-hover: #d97706;--color-rapid: #10b981;--color-rapid-hover: #059669;--color-classical: #8b5cf6;--color-classical-hover: #7c3aed;--color-success: #34d399;--color-success-light: rgba(52, 211, 153, .1);--color-success-border: rgba(52, 211, 153, .3);--color-error: #f87171;--color-error-light: rgba(248, 113, 113, .1);--color-error-border: rgba(248, 113, 113, .3);--color-warning: #fbbf24;--color-warning-light: rgba(251, 191, 36, .1);--color-warning-border: rgba(251, 191, 36, .3);--color-info: #60a5fa;--color-info-light: rgba(96, 165, 250, .1);--color-info-border: rgba(96, 165, 250, .3);--shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, .3);--shadow: 0 1px 3px 0 rgba(0, 0, 0, .4), 0 1px 2px 0 rgba(0, 0, 0, .3);--shadow-md: 0 4px 6px -1px rgba(0, 0, 0, .4), 0 2px 4px -1px rgba(0, 0, 0, .3);--shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, .5), 0 4px 6px -2px rgba(0, 0, 0, .4);--shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, .6), 0 10px 10px -5px rgba(0, 0, 0, .5);--shadow-glow: 0 0 20px rgba(34, 211, 238, .2);--spacing-xs: .25rem;--spacing-sm: .5rem;--spacing-md: 1rem;--spacing-lg: 1.5rem;--spacing-xl: 2rem;--spacing-2xl: 3rem;--spacing-3xl: 4rem;--radius-sm: .25rem;--radius: .5rem;--radius-md: .75rem;--radius-lg: 1rem;--radius-xl: 1.5rem;--radius-full: 9999px;--font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;--font-mono: "SF Mono", Monaco, "Cascadia Code", "Roboto Mono", Consolas, "Courier New", monospace;--text-xs: .75rem;--text-sm: .875rem;--text-base: 1rem;--text-lg: 1.125rem;--text-xl: 1.25rem;--text-2xl: 1.5rem;--text-3xl: 1.875rem;--text-4xl: 2.25rem;--font-light: 300;--font-normal: 400;--font-medium: 500;--font-semibold: 600;--font-bold: 700;--transition-fast: .15s cubic-bezier(.4, 0, .2, 1);--transition-base: .2s cubic-bezier(.4, 0, .2, 1);--transition-slow: .3s cubic-bezier(.4, 0, .2, 1);--z-dropdown: 1000;--z-sticky: 1020;--z-fixed: 1030;--z-modal-backdrop: 1040;--z-modal: 1050;--z-popover: 1060;--z-tooltip: 1070}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html,body{height:100%;width:100%;margin:0;padding:0}app-root{display:block;min-height:100%;width:100%}body{font-family:var(--font-sans);font-size:var(--text-base);line-height:1.5;color:var(--color-text);background-color:var(--color-background);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}h1,h2,h3,h4,h5,h6{font-weight:var(--font-semibold);line-height:1.2;color:var(--color-text)}h1{font-size:var(--text-4xl)}h2{font-size:var(--text-3xl)}h3{font-size:var(--text-2xl)}h4{font-size:var(--text-xl)}h5{font-size:var(--text-lg)}h6{font-size:var(--text-base)}p{margin:0}a{color:var(--color-primary);text-decoration:none;transition:color var(--transition-fast)}a:hover{color:var(--color-primary-hover);text-decoration:underline}.btn,button:not(.unstyled){display:inline-flex;align-items:center;justify-content:center;gap:var(--spacing-sm);padding:.625rem 1.25rem;font-size:var(--text-sm);font-weight:var(--font-medium);line-height:1.5;text-align:center;border:1px solid transparent;border-radius:var(--radius);cursor:pointer;transition:all var(--transition-base);outline:none;-webkit-user-select:none;user-select:none}.btn:disabled,button:disabled{opacity:.5;cursor:not-allowed}.btn-primary,.btn-default{color:var(--color-background);background-color:var(--color-primary);border-color:var(--color-primary)}.btn-primary:hover:not(:disabled),.btn-default:hover:not(:disabled){background-color:var(--color-primary-hover);border-color:var(--color-primary-hover);transform:translateY(-1px);box-shadow:var(--shadow-glow)}.btn-primary:active:not(:disabled),.btn-default:active:not(:disabled){transform:translateY(0)}button.btn-secondary,.btn.btn-secondary{color:var(--color-text);background-color:var(--color-surface);border-color:var(--color-border)}button.btn-secondary:hover:not(:disabled),.btn.btn-secondary:hover:not(:disabled){background-color:var(--color-surface-hover);border-color:var(--color-border-hover);box-shadow:var(--shadow-sm)}.btn-ghost{color:var(--color-text-secondary);background-color:transparent;border-color:transparent}.btn-ghost:hover:not(:disabled){color:var(--color-text);background-color:var(--color-background-secondary)}.btn-danger{color:#fff;background-color:var(--color-error);border-color:var(--color-error)}.btn-danger:hover:not(:disabled){background-color:#dc2626;border-color:#dc2626;transform:translateY(-1px);box-shadow:var(--shadow-md)}.btn-close,.btn-clear{display:inline-flex;align-items:center;justify-content:center;width:2rem;height:2rem;padding:0;color:var(--color-text-secondary);background-color:transparent;border:none;border-radius:var(--radius);cursor:pointer;transition:all var(--transition-fast)}.btn-close:hover,.btn-clear:hover{color:var(--color-text);background-color:var(--color-background-secondary)}.btn-sm{padding:.375rem .875rem;font-size:var(--text-xs)}.btn-lg{padding:.75rem 1.5rem;font-size:var(--text-base)}.btn-full{width:100%}.form-group{margin-bottom:0}.form-label{display:block;margin-bottom:var(--spacing-sm);font-size:var(--text-sm);font-weight:var(--font-medium);color:var(--color-text)}.form-hint{display:block;margin-top:var(--spacing-xs);font-size:var(--text-xs);color:var(--color-text-muted)}.form-error{display:block;margin-top:var(--spacing-xs);font-size:var(--text-xs);color:var(--color-error)}input[type=text],input[type=email],input[type=password],input[type=number],input[type=tel],input[type=url],input[type=search],textarea,select{width:100%;padding:.625rem .875rem;font-size:var(--text-sm);font-family:inherit;line-height:1.5;color:var(--color-text);background-color:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius);outline:none;transition:all var(--transition-base)}input::placeholder,textarea::placeholder{color:var(--color-text-muted)}input:hover:not(:disabled):not(:focus),textarea:hover:not(:disabled):not(:focus),select:hover:not(:disabled):not(:focus){border-color:var(--color-border-hover)}input:focus,textarea:focus,select:focus{border-color:var(--color-primary);box-shadow:0 0 0 3px var(--color-primary-light)}input:disabled,textarea:disabled,select:disabled{opacity:.5;cursor:not-allowed;background-color:var(--color-background-secondary)}.input-disabled{opacity:.5;cursor:not-allowed;background-color:var(--color-background-secondary)}textarea{min-height:100px;resize:vertical}.form-row{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:var(--spacing-md)}.card{background-color:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);overflow:hidden}.card-header{padding:var(--spacing-lg);border-bottom:1px solid var(--color-border)}.card-title{margin:0;font-size:var(--text-xl);font-weight:var(--font-semibold);color:var(--color-text)}.card-description{margin-top:var(--spacing-xs);font-size:var(--text-sm);color:var(--color-text-secondary)}.card-body{padding:var(--spacing-lg)}.card-footer{padding:var(--spacing-lg);background-color:var(--color-background-secondary);border-top:1px solid var(--color-border)}.card-hover{transition:all var(--transition-base)}.card-hover:hover{border-color:var(--color-border-hover);box-shadow:var(--shadow-lg);transform:translateY(-2px)}.container{width:100%;max-width:1200px;margin:0 auto;padding:0 var(--spacing-md)}.container-sm{max-width:640px}.container-md{max-width:768px}.container-lg{max-width:1024px}.flex{display:flex}.flex-col{flex-direction:column}.flex-row{flex-direction:row}.flex-wrap{flex-wrap:wrap}.items-center{align-items:center}.items-start{align-items:flex-start}.items-end{align-items:flex-end}.justify-center{justify-content:center}.justify-between{justify-content:space-between}.justify-start{justify-content:flex-start}.justify-end{justify-content:flex-end}.gap-xs{gap:var(--spacing-xs)}.gap-sm{gap:var(--spacing-sm)}.gap-md{gap:var(--spacing-md)}.gap-lg{gap:var(--spacing-lg)}.gap-xl{gap:var(--spacing-xl)}.grid{display:grid}.grid-cols-2{grid-template-columns:repeat(2,1fr)}.grid-cols-3{grid-template-columns:repeat(3,1fr)}.grid-cols-4{grid-template-columns:repeat(4,1fr)}.p-xs{padding:var(--spacing-xs)}.p-sm{padding:var(--spacing-sm)}.p-md{padding:var(--spacing-md)}.p-lg{padding:var(--spacing-lg)}.p-xl{padding:var(--spacing-xl)}.m-xs{margin:var(--spacing-xs)}.m-sm{margin:var(--spacing-sm)}.m-md{margin:var(--spacing-md)}.m-lg{margin:var(--spacing-lg)}.m-xl{margin:var(--spacing-xl)}.text-left{text-align:left}.text-center{text-align:center}.text-right{text-align:right}.block{display:block}.inline-block{display:inline-block}.hidden{display:none}.invisible{visibility:hidden}.w-full{width:100%}.h-full{height:100%}.spinner,.loading-spinner-small{display:inline-block;width:1rem;height:1rem;border:2px solid var(--color-border);border-top-color:var(--color-primary);border-radius:50%;animation:spin .8s linear infinite}.spinner{width:2rem;height:2rem;border-width:3px}.spinner-sm{width:1rem;height:1rem;border-width:2px}.spinner-lg{width:3rem;height:3rem;border-width:4px}@keyframes spin{to{transform:rotate(360deg)}}.loading-state{display:flex;align-items:center;justify-content:center;padding:var(--spacing-xl);color:var(--color-text-secondary)}@keyframes fadeIn{0%{opacity:0;transform:translateY(-10px)}to{opacity:1;transform:translateY(0)}}.fade-in{animation:fadeIn var(--transition-base) ease-out}.chip{display:inline-flex;align-items:center;gap:var(--spacing-xs);padding:.25rem .75rem;font-size:var(--text-xs);font-weight:var(--font-medium);color:var(--color-text);background-color:var(--color-background-secondary);border:1px solid var(--color-border);border-radius:var(--radius-full);white-space:nowrap}.chip-remove{display:inline-flex;align-items:center;justify-content:center;width:1rem;height:1rem;padding:0;color:var(--color-text-secondary);background-color:transparent;border:none;border-radius:50%;cursor:pointer;transition:all var(--transition-fast)}.chip-remove:hover{color:var(--color-text);background-color:var(--color-border)}.chips-container{display:flex;flex-wrap:wrap;gap:var(--spacing-sm);margin-bottom:var(--spacing-sm)}.dropdown,.menu-container{position:absolute;z-index:var(--z-dropdown);min-width:200px;margin-top:var(--spacing-xs);background-color:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius);box-shadow:var(--shadow-lg);overflow:hidden;animation:fadeIn var(--transition-fast) ease-out}.dropdown-item{display:block;width:100%;padding:.625rem 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var(--color-error)}.toast-warning{border-left:4px solid var(--color-warning)}.toast-info{border-left:4px solid var(--color-info)}.toast-content{flex:1}.toast-title{margin-bottom:var(--spacing-xs);font-size:var(--text-sm);font-weight:var(--font-semibold);color:var(--color-text)}.toast-message{font-size:var(--text-sm);color:var(--color-text-secondary)}@keyframes slideInRight{0%{opacity:0;transform:translate(100%)}to{opacity:1;transform:translate(0)}}.challenge-alert-container{position:fixed;top:var(--spacing-md);left:50%;transform:translate(-50%);z-index:var(--z-tooltip);display:flex;flex-direction:column;gap:var(--spacing-sm);max-width:420px;width:calc(100% - var(--spacing-lg) * 2)}.challenge-alert{display:flex;flex-direction:column;background-color:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-lg);box-shadow:var(--shadow-xl);overflow:hidden;animation:slideInDown var(--transition-base) ease-out}.challenge-alert-header{display:flex;align-items:center;gap:var(--spacing-sm);padding:var(--spacing-md);background-color:var(--color-primary);color:#fff}.challenge-alert-icon{font-size:var(--text-xl)}.challenge-alert-title{flex:1;font-size:var(--text-base);font-weight:var(--font-semibold)}.challenge-alert-header .btn-close{color:#fff;opacity:.8}.challenge-alert-header .btn-close:hover{opacity:1}.challenge-alert-body{padding:var(--spacing-md)}.challenge-alert-challenger{font-size:var(--text-base);color:var(--color-text);margin-bottom:var(--spacing-sm)}.challenge-alert-details{display:flex;gap:var(--spacing-md);font-size:var(--text-sm);color:var(--color-text-secondary)}.challenge-alert-time,.challenge-alert-color{display:flex;align-items:center;gap:var(--spacing-xs)}.challenge-alert-time .material-icons,.challenge-alert-color .material-icons{font-size:var(--text-base)}.challenge-alert-actions{display:flex;gap:var(--spacing-sm);padding:var(--spacing-sm) var(--spacing-md) var(--spacing-md)}.btn-challenge-accept,.btn-challenge-decline{flex:1;display:flex;align-items:center;justify-content:center;gap:var(--spacing-xs);padding:var(--spacing-sm) var(--spacing-md);border:none;border-radius:var(--radius);font-size:var(--text-sm);font-weight:var(--font-medium);cursor:pointer;transition:all var(--transition-fast)}.btn-challenge-accept{background-color:var(--color-success);color:#fff}.btn-challenge-accept:hover:not(:disabled){background-color:var(--color-success-dark, #16a34a)}.btn-challenge-decline{background-color:var(--color-surface-elevated);color:var(--color-text);border:1px solid var(--color-border)}.btn-challenge-decline:hover:not(:disabled){background-color:var(--color-surface-hover)}.btn-challenge-accept:disabled,.btn-challenge-decline:disabled{opacity:.6;cursor:not-allowed}.btn-challenge-accept .material-icons,.btn-challenge-decline .material-icons{font-size:var(--text-lg)}@keyframes slideInDown{0%{opacity:0;transform:translateY(-100%)}to{opacity:1;transform:translateY(0)}}.modal-backdrop{position:fixed;inset:0;z-index:var(--z-modal-backdrop);background-color:#000000b3;animation:fadeIn var(--transition-base) ease-out}.modal{position:fixed;top:50%;left:50%;z-index:var(--z-modal);transform:translate(-50%,-50%);width:90%;max-width:500px;max-height:90vh;background-color:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-lg);box-shadow:var(--shadow-xl);overflow:hidden;animation:fadeIn var(--transition-base) ease-out;display:flex;flex-direction:column}.modal-header{display:flex;align-items:center;justify-content:space-between;padding:var(--spacing-lg);border-bottom:1px solid var(--color-border);flex-shrink:0}.modal-title{margin:0;font-size:var(--text-xl);font-weight:var(--font-semibold);color:var(--color-text)}.modal-body{padding:var(--spacing-lg);overflow-y:auto;flex:1;min-height:0}.modal-footer{display:flex;align-items:center;justify-content:flex-end;gap:var(--spacing-sm);padding:var(--spacing-lg);border-top:1px solid var(--color-border);background-color:var(--color-background-secondary);flex-shrink:0}.tooltip{position:absolute;z-index:var(--z-tooltip);padding:.5rem .75rem;font-size:var(--text-xs);color:var(--color-text);background-color:var(--color-surface-elevated);border:1px solid var(--color-border);border-radius:var(--radius);box-shadow:var(--shadow-lg);pointer-events:none;white-space:nowrap;animation:fadeIn var(--transition-fast) ease-out}.tooltip:after{content:"";position:absolute;border:5px solid transparent}.tooltip.tooltip-top:after{top:100%;left:50%;margin-left:-5px;border-top-color:var(--color-surface-elevated)}.tooltip.tooltip-bottom:after{bottom:100%;left:50%;margin-left:-5px;border-bottom-color:var(--color-surface-elevated)}*::-webkit-scrollbar{width:8px;height:8px}*::-webkit-scrollbar-track{background:transparent}*::-webkit-scrollbar-thumb{background:var(--color-border);border-radius:var(--radius);border:2px solid var(--color-background-secondary)}*::-webkit-scrollbar-thumb:hover{background:var(--color-text-muted)}*{scrollbar-width:thin;scrollbar-color:var(--color-border) transparent}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border-width:0}:focus-visible{outline:2px solid var(--color-primary);outline-offset:2px}@media(max-width:768px){.container{padding:0 var(--spacing-sm)}.card-body,.card-header,.card-footer{padding:var(--spacing-md)}.modal{width:95%;max-height:85vh}.form-row{grid-template-columns:1fr}}@media(max-width:640px){h1{font-size:var(--text-3xl)}h2{font-size:var(--text-2xl)}h3{font-size:var(--text-xl)}.toast-container{left:var(--spacing-sm);right:var(--spacing-sm);max-width:none}.modal{max-height:80vh}}