:root{--color-primary: #6c5ce7;--color-primary-light: #a29bfe;--color-primary-dark: #4834d4;--color-secondary: #00cec9;--color-accent: #fdcb6e;--color-success: #00b894;--color-danger: #e17055;--color-warning: #ffeaa7;--bg-main: #f8f9ff;--bg-card: #ffffff;--bg-nav: #6c5ce7;--text-primary: #2d3436;--text-secondary: #636e72;--text-light: #b2bec3;--text-inverse: #ffffff;--board-light: #f0d9b5;--board-dark: #b58863;--board-highlight: rgba(255, 255, 0, .4);--board-legal: rgba(0, 0, 0, .1);--board-last-move: rgba(155, 199, 0, .41);--space-xs: 4px;--space-sm: 8px;--space-md: 16px;--space-lg: 24px;--space-xl: 32px;--space-2xl: 48px;--radius-sm: 8px;--radius-md: 12px;--radius-lg: 16px;--radius-full: 999px;--shadow-sm: 0 2px 8px rgba(0, 0, 0, .08);--shadow-md: 0 4px 16px rgba(0, 0, 0, .12);--shadow-lg: 0 8px 32px rgba(0, 0, 0, .16);--font-main: "Segoe UI", system-ui, -apple-system, sans-serif;--font-mono: "Cascadia Code", "Fira Code", monospace;--transition-fast: .15s ease;--transition-normal: .25s ease;--transition-slow: .4s ease}[data-theme=dark]{--bg-main: #1a1a2e;--bg-card: #16213e;--text-primary: #eaeaea;--text-secondary: #a0a0b0;--text-light: #666680;--shadow-sm: 0 2px 8px rgba(0, 0, 0, .3);--shadow-md: 0 4px 16px rgba(0, 0, 0, .4)}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{font-size:16px;-webkit-text-size-adjust:100%}body{font-family:var(--font-main);background:linear-gradient(135deg,var(--bg-main) 0%,#e8e4f0 100%);color:var(--text-primary);line-height:1.5;min-height:100vh;overflow-x:hidden}#app{display:flex;flex-direction:column;min-height:100vh}#main-nav{background:linear-gradient(135deg,var(--color-primary) 0%,var(--color-primary-dark) 100%);color:var(--text-inverse);padding:var(--space-sm) var(--space-md);display:flex;align-items:center;justify-content:space-between;position:sticky;top:0;z-index:100;box-shadow:var(--shadow-md);backdrop-filter:blur(10px)}.nav-logo{color:var(--text-inverse);text-decoration:none;font-size:1.25rem;font-weight:700;letter-spacing:-.5px}.nav-links{display:flex;gap:var(--space-xs)}.nav-links a{color:#fffc;text-decoration:none;padding:var(--space-xs) var(--space-sm);border-radius:var(--radius-sm);font-size:.85rem;font-weight:500;transition:var(--transition-fast)}.nav-links a:hover,.nav-links a.active{background:#ffffff26;color:#fff}#page-content{flex:1;padding:var(--space-md);max-width:900px;margin:0 auto;width:100%}.card{background:var(--bg-card);border-radius:var(--radius-lg);padding:var(--space-lg);box-shadow:var(--shadow-sm);transition:var(--transition-normal)}.card:hover{box-shadow:var(--shadow-md);transform:translateY(-2px)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--space-sm);padding:var(--space-sm) var(--space-lg);border:none;border-radius:var(--radius-full);font-family:var(--font-main);font-size:1rem;font-weight:600;cursor:pointer;transition:var(--transition-fast);text-decoration:none}.btn-primary{background:var(--color-primary);color:var(--text-inverse)}.btn-primary:hover{background:var(--color-primary-dark);transform:scale(1.03)}.btn-secondary{background:var(--color-secondary);color:var(--text-inverse)}.btn-ghost{background:transparent;color:var(--color-primary);border:2px solid var(--color-primary)}.btn-ghost:hover{background:var(--color-primary);color:var(--text-inverse)}.btn-danger{background:var(--color-danger);color:var(--text-inverse)}.btn-sm{padding:var(--space-xs) var(--space-md);font-size:.85rem}.btn-lg{padding:var(--space-md) var(--space-xl);font-size:1.15rem}.btn:disabled{opacity:.5;cursor:not-allowed;transform:none}.text-center{text-align:center}.text-secondary{color:var(--text-secondary)}.mt-sm{margin-top:var(--space-sm)}.mt-md{margin-top:var(--space-md)}.mt-lg{margin-top:var(--space-lg)}.mb-md{margin-bottom:var(--space-md)}.mb-lg{margin-bottom:var(--space-lg)}.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:var(--space-md)}.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:var(--space-md)}.toast{position:fixed;bottom:var(--space-lg);left:50%;transform:translate(-50%) translateY(100px);background:var(--bg-card);color:var(--text-primary);padding:var(--space-md) var(--space-lg);border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);z-index:1000;opacity:0;transition:all var(--transition-normal);font-weight:600}.toast.show{transform:translate(-50%) translateY(0);opacity:1}.toast.success{border-left:4px solid var(--color-success)}.toast.error{border-left:4px solid var(--color-danger)}.toast.achievement{border-left:4px solid var(--color-accent)}@media (max-width: 640px){.nav-links{gap:2px}.nav-links a{font-size:.75rem;padding:var(--space-xs) 6px}.grid-2{grid-template-columns:1fr}.grid-3{grid-template-columns:repeat(2,1fr)}#page-content{padding:var(--space-sm)}}@media (max-width: 380px){.nav-links a{font-size:.65rem;padding:3px 4px}.nav-logo{font-size:1rem}}.board-container{display:flex;flex-direction:column;align-items:center;gap:var(--space-md)}.board-wrapper{position:relative;width:min(90vw,480px);height:min(90vw,480px);border-radius:var(--radius-md);overflow:hidden;box-shadow:0 8px 32px #6c5ce733,0 4px 16px #0000001a;border:3px solid rgba(108,92,231,.3);background:var(--board-light)}.chess-board{width:100%;height:100%;display:flex;align-items:center;justify-content:center}.board-wrapper .cg-wrap{width:100%;height:100%}.board-wrapper cg-board{background-color:var(--board-light)}.board-wrapper coords{font-size:.65rem;font-weight:700;color:#00000080}.board-wrapper piece{width:12.5%;height:12.5%}.board-wrapper .last-move{background-color:var(--board-last-move)!important}.board-wrapper .move-dest{background:radial-gradient(var(--board-legal) 25%,transparent 25%)}.board-wrapper .move-dest:hover{background:radial-gradient(rgba(0,0,0,.2) 25%,transparent 25%)}.board-wrapper .check{background:radial-gradient(ellipse at center,rgba(255,0,0,.6) 0%,rgba(255,0,0,.3) 25%,transparent 80%)}.game-info{display:flex;align-items:center;justify-content:space-between;width:min(90vw,480px);padding:var(--space-sm) var(--space-md);background:var(--bg-card);border-radius:var(--radius-md);box-shadow:var(--shadow-sm)}.game-info .turn{font-weight:600;font-size:.95rem}.game-info .difficulty{font-size:.85rem;color:var(--text-secondary)}.game-controls{display:flex;gap:var(--space-sm);flex-wrap:wrap;justify-content:center;width:min(90vw,480px)}.game-controls .btn{flex:1;min-width:80px}.ai-thinking{display:flex;align-items:center;gap:var(--space-sm);color:var(--color-primary);font-weight:600}.ai-thinking .spinner{width:18px;height:18px;border:3px solid var(--color-primary-light);border-top-color:var(--color-primary);border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.promotion-dialog{position:fixed;inset:0;background:#0009;display:flex;align-items:center;justify-content:center;z-index:200}.promotion-choices{display:flex;gap:var(--space-md);background:var(--bg-card);padding:var(--space-lg);border-radius:var(--radius-lg);box-shadow:var(--shadow-lg)}.promotion-choice{width:64px;height:64px;display:flex;align-items:center;justify-content:center;font-size:2.5rem;cursor:pointer;border-radius:var(--radius-md);border:3px solid transparent;transition:var(--transition-fast)}.promotion-choice:hover{border-color:var(--color-primary);background:var(--color-primary-light);transform:scale(1.1)}.game-over-overlay{position:fixed;inset:0;background:#000000b3;display:flex;align-items:center;justify-content:center;z-index:200;animation:fadeIn var(--transition-normal)}.game-over-card{background:var(--bg-card);padding:var(--space-2xl);border-radius:var(--radius-lg);text-align:center;box-shadow:var(--shadow-lg);animation:bounceIn var(--transition-slow)}.game-over-card .result-icon{font-size:4rem;margin-bottom:var(--space-md)}.game-over-card h2{font-size:1.5rem;margin-bottom:var(--space-sm)}.game-over-card p{color:var(--text-secondary);margin-bottom:var(--space-lg)}.game-over-card .btn{margin:0 var(--space-sm)}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes bounceIn{0%{transform:scale(.5);opacity:0}60%{transform:scale(1.05)}to{transform:scale(1);opacity:1}}.home-page{padding-top:var(--space-xl)}.home-hero{margin-bottom:var(--space-2xl)}.hero-icon{font-size:5rem;line-height:1;margin-bottom:var(--space-md);animation:float 3s ease-in-out infinite}@keyframes float{0%,to{transform:translateY(0)}50%{transform:translateY(-10px)}}.home-hero h1{font-size:2.5rem;font-weight:800;color:var(--color-primary);margin-bottom:var(--space-sm);text-shadow:0 2px 4px rgba(108,92,231,.2)}.tagline{font-size:1.2rem;font-weight:600;color:var(--text-primary);margin-bottom:var(--space-xs)}.subtitle{font-size:.95rem}.home-menu{display:grid;grid-template-columns:repeat(2,1fr);gap:var(--space-md)}.menu-card{background:var(--bg-card);border-radius:var(--radius-lg);padding:var(--space-lg);text-align:center;text-decoration:none;color:var(--text-primary);box-shadow:var(--shadow-sm);transition:var(--transition-normal);cursor:pointer}.menu-card:hover{box-shadow:var(--shadow-md);transform:translateY(-4px)}.menu-card:first-child{grid-column:1 / -1;background:linear-gradient(135deg,var(--color-primary),var(--color-primary-dark));color:#fff}.menu-card:first-child .menu-desc{color:#fffc}.menu-icon{font-size:2.5rem;margin-bottom:var(--space-sm)}.menu-label{font-size:1.1rem;font-weight:700;margin-bottom:var(--space-xs)}.menu-desc{font-size:.8rem;color:var(--text-secondary)}.play-page{display:flex;justify-content:center}.difficulty-selector{margin-top:var(--space-md);text-align:center}.diff-buttons{display:flex;gap:var(--space-sm);margin-top:var(--space-sm);justify-content:center;flex-wrap:wrap}.chess-board{width:100%;height:100%}.board-table{width:100%;height:100%;border-collapse:collapse;table-layout:fixed;max-width:100%;max-height:100%}.board-table td{width:12.5%;height:12.5%;text-align:center;vertical-align:middle;font-size:min(8vw,46px);cursor:pointer;transition:all var(--transition-fast);user-select:none;position:relative;line-height:1;text-shadow:0 1px 2px rgba(0,0,0,.15)}.board-table td.light{background-color:var(--board-light)}.board-table td.dark{background-color:var(--board-dark)}.board-table td.selected{background-color:var(--board-highlight)!important}.board-table td.legal-target{background:radial-gradient(circle,rgba(0,0,0,.15) 25%,transparent 25%)!important;cursor:pointer}.board-table td.last-move{background-color:#9bc70069!important}.board-table td.in-check{background:radial-gradient(ellipse at center,rgba(255,0,0,.6) 0%,rgba(255,0,0,.3) 25%,transparent 80%)!important;animation:check-pulse 1s ease-in-out infinite}@keyframes check-pulse{0%,to{box-shadow:inset 0 0 10px #ff00004d}50%{box-shadow:inset 0 0 20px #f009}}.board-table td.correct{background-color:#00b89466!important}.board-table td.wrong{background-color:#e1705566!important}.board-table td.hint{background-color:#fdcb6e99!important;animation:pulse 1s ease-in-out infinite}@keyframes pulse{0%,to{background-color:#fdcb6e99}50%{background-color:#fdcb6ee6}}.learn-page .page-title{font-size:1.5rem;margin-bottom:var(--space-xs)}.lesson-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:var(--space-md)}.lesson-card{text-align:center;cursor:pointer;padding:var(--space-lg)}.lesson-icon{font-size:2rem;margin-bottom:var(--space-sm)}.lesson-title{font-weight:700;margin-bottom:var(--space-xs)}.lesson-desc{font-size:.8rem;color:var(--text-secondary)}.lesson-board-container{display:flex;justify-content:center;margin:var(--space-md) 0}.lesson-explanation{font-size:1rem;line-height:1.6;text-align:center}.lesson-nav{display:flex;align-items:center;justify-content:space-between;margin-top:var(--space-md);gap:var(--space-md)}.puzzle-page .page-title{font-size:1.5rem;margin-bottom:var(--space-xs)}.puzzle-category{text-align:center;cursor:pointer;padding:var(--space-lg)}.puzzle-cat-icon{font-size:2rem;margin-bottom:var(--space-sm)}.puzzle-cat-name{font-weight:700;margin-bottom:var(--space-xs)}.puzzle-cat-desc{font-size:.7rem;color:var(--text-light);margin-top:var(--space-xs)}.puzzle-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:var(--space-md)}.puzzle-category-label{font-weight:700;font-size:1.1rem}.puzzle-feedback.success{color:var(--color-success);font-weight:700}.puzzle-feedback.error{color:var(--color-danger)}.puzzle-feedback.info{color:var(--color-primary)}.puzzle-description{text-align:center;font-weight:600;font-size:1.1rem}.puzzle-feedback{text-align:center;font-weight:600;margin:var(--space-md) 0;min-height:1.5em}.page-title{font-size:1.5rem;margin-bottom:var(--space-lg)}.section-title{font-size:1.1rem;margin-bottom:var(--space-md);color:var(--text-primary)}.level-card{display:flex;align-items:center;gap:var(--space-lg);padding:var(--space-lg)}.level-icon{font-size:3rem}.level-name{font-size:1.3rem;font-weight:700}.level-points{font-size:.95rem;color:var(--text-secondary);margin-bottom:var(--space-sm)}.progress-bar{height:8px;background:var(--bg-main);border-radius:var(--radius-full);overflow:hidden;margin-bottom:var(--space-xs)}.progress-fill{height:100%;background:linear-gradient(90deg,var(--color-primary),var(--color-secondary));border-radius:var(--radius-full);transition:width var(--transition-slow)}.stat-card{text-align:center;padding:var(--space-lg)}.stat-value{font-size:2rem;font-weight:800;color:var(--color-primary)}.stat-card.win .stat-value{color:var(--color-success)}.stat-card.loss .stat-value{color:var(--color-danger)}.stat-card.draw .stat-value{color:var(--color-accent)}.stat-label{font-size:.85rem;color:var(--text-secondary);margin-top:var(--space-xs)}.achievements-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:var(--space-md)}.achievement-card{text-align:center;padding:var(--space-md)}.achievement-card.locked{opacity:.5}.achievement-icon{font-size:2rem;margin-bottom:var(--space-xs)}.achievement-name{font-weight:700;font-size:.9rem;margin-bottom:var(--space-xs)}.achievement-desc{font-size:.75rem;color:var(--text-secondary)}.settings-section{padding:var(--space-lg)}.settings-heading{font-size:1rem;margin-bottom:var(--space-md);padding-bottom:var(--space-sm);border-bottom:1px solid rgba(0,0,0,.06)}.setting-row{display:flex;align-items:center;justify-content:space-between;padding:var(--space-sm) 0}.setting-row label:first-child{font-weight:500}.setting-select{padding:var(--space-xs) var(--space-sm);border:2px solid var(--text-light);border-radius:var(--radius-sm);font-family:var(--font-main);font-size:.9rem;background:var(--bg-card);color:var(--text-primary)}.clock-page .page-title{font-size:1.5rem;margin-bottom:var(--space-xs)}.preset-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:var(--space-sm)}.preset-btn{font-size:.8rem!important;padding:var(--space-xs) var(--space-sm)!important}.clock-input{width:80px;padding:var(--space-xs) var(--space-sm);border:2px solid var(--text-light);border-radius:var(--radius-sm);font-size:1rem;text-align:center;font-family:var(--font-main)}.clock-board{display:flex;flex-direction:column;gap:var(--space-md);max-width:400px;margin:0 auto}.clock-side{background:var(--bg-card);border-radius:var(--radius-lg);padding:var(--space-xl) var(--space-lg);text-align:center;cursor:pointer;transition:all var(--transition-fast);box-shadow:var(--shadow-sm);user-select:none;border:3px solid transparent}.clock-side:active{transform:scale(.98)}.clock-side.active{border-color:var(--color-primary);box-shadow:0 0 20px #6c5ce74d}.clock-white{order:3}.clock-black{order:1}.clock-middle{order:2;text-align:center}.clock-label{font-weight:600;font-size:1rem;margin-bottom:var(--space-sm)}.clock-time{font-size:3.5rem;font-weight:800;font-family:var(--font-mono);letter-spacing:-2px;color:var(--text-primary)}.clock-time.low{color:var(--color-warning);animation:pulse-text 1s ease-in-out infinite}.clock-time.critical{color:var(--color-danger);animation:pulse-text .5s ease-in-out infinite}@keyframes pulse-text{0%,to{opacity:1}50%{opacity:.5}}.clock-status{font-weight:600;margin-bottom:var(--space-md);color:var(--text-secondary)}.clock-controls{display:flex;gap:var(--space-sm);justify-content:center}.toggle{position:relative;display:inline-block;width:48px;height:26px}.toggle input{opacity:0;width:0;height:0}.toggle-slider{position:absolute;cursor:pointer;inset:0;background:var(--text-light);border-radius:var(--radius-full);transition:var(--transition-fast)}.toggle-slider:before{content:"";position:absolute;height:20px;width:20px;left:3px;bottom:3px;background:#fff;border-radius:50%;transition:var(--transition-fast)}.toggle input:checked+.toggle-slider{background:var(--color-primary)}.toggle input:checked+.toggle-slider:before{transform:translate(22px)}@media (max-width: 480px){.home-menu,.lesson-grid,.achievements-grid{grid-template-columns:1fr}.level-card{flex-direction:column;text-align:center}.diff-buttons{flex-direction:column;align-items:center}.board-table td{font-size:min(9vw,36px)}}
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