:root{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;line-height:1.5;font-weight:400;color-scheme:light;color:#213547;background-color:#fafafa;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;-webkit-text-size-adjust:100%}*{box-sizing:border-box;margin:0;padding:0}html{height:100vh;height:100dvh;overflow:hidden}body{margin:0;min-width:320px;height:100vh;height:100dvh;overflow:hidden}@media(max-width:767px){html{overflow-y:auto;-webkit-overflow-scrolling:touch}body{overflow-y:auto;-webkit-overflow-scrolling:touch;overscroll-behavior-y:auto}}h1{font-size:3.2em;line-height:1.1}button{border-radius:8px;border:1px solid transparent;padding:.6em 1.2em;font-size:1em;font-weight:500;font-family:inherit;background-color:#f9f9f9;cursor:pointer;transition:border-color .25s}button:hover{border-color:#646cff}button:focus,button:focus-visible{outline:4px auto -webkit-focus-ring-color}@media(min-width:1024px){::-webkit-scrollbar{width:10px;height:10px}::-webkit-scrollbar-track{background:#f1f1f1;border-radius:5px}::-webkit-scrollbar-thumb{background:#c1c1c1;border-radius:5px}::-webkit-scrollbar-thumb:hover{background:#a8a8a8}}@media(max-width:1023px){::-webkit-scrollbar{width:0px;height:0px;display:none}*{scrollbar-width:none}*{-ms-overflow-style:none}}.text-center{text-align:center}.mb-1{margin-bottom:.5rem}.mb-2{margin-bottom:1rem}.mb-3{margin-bottom:1.5rem}.mb-4{margin-bottom:2rem}.desktop-sidebar{position:fixed;top:0;left:0;height:100vh;background:#fffffffa;-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);border-right:1px solid rgba(0,0,0,.08);z-index:100;display:none;flex-direction:column;box-shadow:2px 0 20px #0000000d;transition:width .3s ease}.sidebar-content{display:flex;flex-direction:column;gap:.5rem;padding:1.5rem .75rem;height:100%}.sidebar-item{display:flex;align-items:center;padding:.875rem 1rem;border:none;background:transparent;border-radius:12px;cursor:pointer;text-decoration:none;color:#666;transition:all .2s ease;font-size:.9375rem;font-weight:500;gap:.875rem;white-space:nowrap;overflow:hidden}.sidebar-item:hover{background:#0000000d;color:#333}.sidebar-item:focus-visible{outline:none;box-shadow:0 0 0 2px var(--accent, #007aff)}.sidebar-item:focus:not(:focus-visible){outline:none}.sidebar-item.active{background:linear-gradient(135deg,var(--accent, #007aff),var(--accent-hover, #0056cc));color:#fff;box-shadow:0 4px 12px #007aff40}.sidebar-item.active:hover{background:linear-gradient(135deg,var(--accent-hover, #0056cc),var(--accent, #007aff))}.sidebar-icon{font-size:1.375rem;min-width:28px;text-align:center;flex-shrink:0;transition:transform .2s ease}.sidebar-item:hover .sidebar-icon{transform:scale(1.1)}.sidebar-label{font-weight:500;transition:opacity .2s ease,width .2s 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ease;font-size:.625rem;font-weight:500;min-width:56px;border-radius:8px;position:relative;overflow:hidden;-webkit-tap-highlight-color:transparent;-webkit-touch-callout:none;-webkit-user-select:none;user-select:none}.nav-item:focus:not(:focus-visible){outline:none}.nav-item:hover{color:#1d1d1f;transform:translateY(-1px)}.nav-item.active{background:linear-gradient(135deg,var(--accent, #007aff),var(--accent-hover, #0056cc));color:#fff;box-shadow:0 4px 12px #007aff40;transform:translateY(-2px);position:relative}.nav-item.active:after{content:"";position:absolute;bottom:-8px;left:50%;transform:translate(-50%);width:20px;height:3px;background:linear-gradient(90deg,var(--accent, #007aff),var(--accent-hover, #0056cc));border-radius:2px;box-shadow:0 2px 4px #007aff4d}.nav-icon{font-size:1.25rem;margin-bottom:.25rem;transition:all .2s ease;position:relative;z-index:1}.nav-item:hover .nav-icon{transform:scale(1.1)}.nav-item.active .nav-icon{transform:scale(1.05);filter:drop-shadow(0 1px 2px 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.75rem;border-radius:8px;font-size:.8125rem;font-weight:500;white-space:nowrap;opacity:0;visibility:hidden;transition:opacity .2s ease,visibility .2s ease;pointer-events:none;z-index:1000;box-shadow:0 4px 12px #00000026}.sidebar-item:before{content:"";position:absolute;left:calc(100% + 4px);top:50%;transform:translateY(-50%);border:6px solid transparent;border-right-color:#000000d9;opacity:0;visibility:hidden;transition:opacity .2s ease,visibility .2s ease;pointer-events:none}.sidebar-item:hover:after,.sidebar-item:hover:before{opacity:1;visibility:visible}.dark .sidebar-item:after{background:#fffffff2;color:#1c1c1e}.dark .sidebar-item:before{border-right-color:#fffffff2}}@media(min-width:1200px){.bottom-nav{display:none!important}.desktop-sidebar{display:flex!important;width:200px}.sidebar-content{padding:1.5rem .75rem}}.badge-notification{position:fixed;top:20px;right:20px;z-index:1000;animation:badgeNotificationSlideIn .5s ease-out;cursor:pointer;-webkit-tap-highlight-color:transparent}@keyframes badgeNotificationSlideIn{0%{transform:translate(100%);opacity:0}to{transform:translate(0);opacity:1}}.badge-notification-content{display:flex;align-items:center;gap:1rem;background:var(--background, #fff);border:2px solid var(--accent, #007aff);border-radius:12px;padding:1rem 1.5rem;box-shadow:0 8px 24px #00000026;max-width:320px}.badge-notification-icon{font-size:1.75rem;animation:badgeNotificationCelebration 1s ease-in-out infinite}@keyframes badgeNotificationCelebration{0%,to{transform:scale(1) rotate(0)}25%{transform:scale(1.15) rotate(-8deg)}75%{transform:scale(1.15) rotate(8deg)}}.badge-notification-title{font-size:.95rem;font-weight:700;color:var(--text, #222);margin-bottom:.35rem}.badge-notification-badge{font-size:.9rem;color:var(--accent, #007aff);font-weight:600;margin-bottom:.25rem}.badge-notification-description{font-size:.8rem;color:var(--text-secondary, #666);line-height:1.35;font-weight:400}@media(max-width:768px){.badge-notification{top:auto;right:1rem;bottom:5rem;left:1rem;max-width:none}.badge-notification-content{max-width:none}}@media(max-width:480px){.badge-notification{bottom:5.5rem}}body.dark .badge-notification-content{background:var(--surface);border-color:var(--accent)}body.dark .badge-notification-title{color:var(--text)}body.dark .badge-notification-badge{color:var(--accent)}body.dark .badge-notification-description{color:var(--text-secondary)}.main-content{transition:margin-left .3s ease}.main-content.full-screen{margin-left:0!important}@media(max-width:767px){.main-content{margin-left:0}}@media(min-width:768px)and (max-width:1199px){.main-content{margin-left:72px}}@media(min-width:1200px){.main-content{margin-left:200px}}.error-boundary{display:flex;align-items:center;justify-content:center;min-height:300px;padding:2rem}.error-boundary-content{text-align:center;max-width:400px}.error-boundary-icon{font-size:3rem;margin-bottom:1rem}.error-boundary-title{font-size:1.5rem;font-weight:600;margin:0 0 .5rem;color:var(--color-text)}.error-boundary-message{color:var(--color-text-secondary);margin:0 0 1.5rem;line-height:1.5}.error-boundary-details{margin-bottom:1.5rem;text-align:left}.error-boundary-details summary{cursor:pointer;color:var(--color-text-secondary);font-size:.875rem;margin-bottom:.5rem}.error-boundary-details summary:hover{color:var(--color-text)}.error-boundary-stack{background:var(--color-surface-secondary);border-radius:8px;padding:1rem;font-size:.75rem;color:var(--color-danger, #ef4444);overflow-x:auto;white-space:pre-wrap;word-break:break-word;margin:0}.error-boundary-actions{display:flex;gap:.75rem;justify-content:center;flex-wrap:wrap}.error-boundary-btn{padding:.75rem 1.5rem;border-radius:8px;font-weight:500;cursor:pointer;transition:all .2s ease;border:none;font-size:.875rem}.error-boundary-btn:focus{outline:2px solid var(--color-primary);outline-offset:2px}.error-boundary-btn-primary{background:var(--color-primary);color:#fff}.error-boundary-btn-primary:hover{background:var(--color-primary-hover, #4f46e5)}.error-boundary-btn-secondary{background:var(--color-surface-secondary);color:var(--color-text)}.error-boundary-btn-secondary:hover{background:var(--color-surface-hover, #e5e7eb)}:root.dark .error-boundary-stack{background:#0000004d}:root.dark .error-boundary-btn-secondary{background:#ffffff1a}:root.dark .error-boundary-btn-secondary:hover{background:#ffffff26}.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;border:none;border-radius:12px;font-weight:500;cursor:pointer;transition:all .2s ease;font-family:inherit;outline:none;-webkit-tap-highlight-color:transparent;-webkit-touch-callout:none;-webkit-user-select:none;user-select:none}.btn:disabled{opacity:.5;cursor:not-allowed}.btn:focus-visible{outline:2px solid var(--primary-color);outline-offset:2px}.btn:focus:not(:focus-visible){outline:none}.btn-small{padding:.5rem 1rem;font-size:.875rem}.btn-medium{padding:.75rem 1.5rem;font-size:1rem}.btn-large{padding:1rem 2rem;font-size:1.125rem}.btn-primary{background:var(--primary-color);color:#fff}.btn-primary:hover:not(:disabled){background:var(--primary-hover);transform:translateY(-1px)}.btn-primary:active:not(:disabled){transform:translateY(0)}.btn-secondary{background:var(--card-bg);color:var(--text-color);border:1px solid var(--border-color)}.btn-secondary:hover:not(:disabled){background:var(--hover-bg);border-color:var(--primary-color)}.btn-danger{background:#ef4444;color:#fff}.btn-danger:hover:not(:disabled){background:#dc2626;transform:translateY(-1px)}.btn-ghost{background:transparent;color:var(--text-color);padding:.5rem}.btn-ghost:hover:not(:disabled){background:var(--hover-bg)}.cookie-consent-overlay{position:fixed;bottom:0;left:0;right:0;z-index:10000;padding:1rem;pointer-events:none}.cookie-consent-banner{max-width:600px;margin:0 auto;background:var(--card-bg);border:1px solid var(--border-color);border-radius:16px;box-shadow:0 8px 24px #00000026;pointer-events:auto;animation:slideUp .3s ease-out}@keyframes slideUp{0%{transform:translateY(100%);opacity:0}to{transform:translateY(0);opacity:1}}.cookie-consent-content{padding:1.5rem}.cookie-consent-title{font-size:1.25rem;font-weight:600;margin:0 0 .75rem;color:var(--text-color)}.cookie-consent-description{font-size:.9375rem;line-height:1.5;color:var(--text-secondary);margin:0 0 1.5rem}.cookie-consent-actions{display:flex;gap:.75rem;flex-wrap:wrap}.cookie-consent-actions .btn{flex:1;min-width:100px}.cookie-consent-details{display:flex;flex-direction:column;gap:1.5rem}.cookie-consent-item{padding:1rem;background:var(--background-alt);border-radius:12px;border:1px solid var(--border-light)}.cookie-consent-item-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:.5rem;gap:1rem}.cookie-consent-item-title{font-size:1rem;font-weight:600;color:var(--text-color)}.cookie-consent-item-status{font-size:.875rem;color:var(--text-secondary);font-weight:500}.cookie-consent-item-description{font-size:.875rem;line-height:1.5;color:var(--text-secondary);margin:0}.cookie-consent-toggle-wrapper{display:flex;align-items:center;gap:.5rem;cursor:pointer}.cookie-consent-toggle{width:44px;height:24px;-webkit-appearance:none;-moz-appearance:none;appearance:none;background:var(--border-color);border-radius:12px;position:relative;cursor:pointer;transition:background .2s ease;outline:none}.cookie-consent-toggle:focus-visible{outline:2px solid var(--primary-color);outline-offset:2px}.cookie-consent-toggle:checked{background:var(--primary-color)}.cookie-consent-toggle:before{content:"";position:absolute;width:20px;height:20px;border-radius:50%;background:#fff;top:2px;left:2px;transition:transform .2s ease;box-shadow:0 2px 4px #0003}.cookie-consent-toggle:checked:before{transform:translate(20px)}.cookie-consent-toggle-label{font-size:.875rem;color:var(--text-color);font-weight:500;-webkit-user-select:none;user-select:none}@media(max-width:767px){.cookie-consent-overlay{padding:.75rem}.cookie-consent-content{padding:1.25rem}.cookie-consent-title{font-size:1.125rem}.cookie-consent-actions{flex-direction:column}.cookie-consent-actions .btn{width:100%}.cookie-consent-item-header{flex-direction:column;align-items:flex-start;gap:.75rem}}:root{--primary: #1a1a1a;--primary-light: #333;--primary-color: #007aff;--primary-hover: #0056cc;--text-primary: #1a1a1a;--text-secondary: #666;--text: #222;--text-color: #222;--background: #ffffff;--background-alt: #f8f8fa;--surface: #f8f9fa;--card-bg: #ffffff;--border: #e5e5e7;--border-light: #f0f0f3;--border-color: #e5e5e7;--hover-bg: #f0f0f3;--accent: #007aff;--accent-hover: #0056cc;--accent-light: #e3f2fd;--red: #e11d48;--red-light: #fecdd3;--black: #1a1a1a;--success: #059669;--success-light: #f0fdf4;--success-border: #86efac;--error: #dc2626;--error-light: #fef2f2;--error-border: #fecaca}.app-container{display:flex;flex-direction:column;min-height:100vh;min-height:100dvh;height:100vh;height:100dvh;background:var(--background, #fff);color:var(--text, #222);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;overflow:hidden}@media(max-width:767px){.app-container{height:100vh;height:100dvh;min-height:100vh;min-height:100dvh;overflow:visible}}.app-container.dark,body.dark{--background: #1a1a1a;--background-alt: #2a2a2a;--surface: #2a2a2a;--card-bg: #2a2a2a;--text: #fff;--text-color: #fff;--text-primary: #fff;--text-secondary: #ccc;--border: #404040;--border-light: #333;--border-color: #404040;--hover-bg: #333;--accent: #0a84ff;--accent-hover: #0056cc;--accent-light: #1a3a5a;--primary-color: #0a84ff;--primary-hover: #0066d6}.main-content{flex:1;padding:1rem;padding-bottom:calc(5rem + env(safe-area-inset-bottom));overflow-y:auto;height:0;min-height:0;-webkit-overflow-scrolling:touch;scroll-behavior:smooth;overscroll-behavior-y:contain}@media(max-width:767px){.main-content{overscroll-behavior-y:auto}}@media(max-width:767px){.main-content{padding:1rem;padding-bottom:calc(5rem + env(safe-area-inset-bottom))}}@media(min-width:768px)and (max-width:1199px){.main-content{padding:1.5rem}}@media(min-width:1200px){.main-content{padding:2rem}}@media(min-width:1536px){.main-content{padding:2.5rem}}.stack-view{width:100%;display:flex;flex-direction:column;align-items:center;max-width:1200px;margin:0 auto;padding:1rem;min-height:100vh;justify-content:flex-start}@media(min-width:1024px){.stack-view{padding:2rem}}.stack-header{display:flex;justify-content:center;align-items:center;width:100%;margin-bottom:2rem;text-align:center}.stack-title{font-size:1.5rem;font-weight:600;color:var(--text, #222);margin:0}.stack-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(80px,1fr));gap:.75rem;width:100%;max-width:600px;justify-content:center;margin:0 auto}@media(min-width:640px){.stack-grid{grid-template-columns:repeat(4,1fr);gap:1rem;max-width:400px}}@media(min-width:768px){.stack-grid{grid-template-columns:repeat(6,1fr);gap:1rem;max-width:600px}}@media(min-width:1024px){.stack-grid{grid-template-columns:repeat(8,1fr);gap:1.25rem;max-width:800px}}@media(min-width:1280px){.stack-grid{grid-template-columns:repeat(10,1fr);gap:1.5rem;max-width:1000px}}@media(min-width:1536px){.stack-grid{grid-template-columns:repeat(12,1fr);gap:1.5rem;max-width:1200px}}.stack-card-item{aspect-ratio:2.5 / 3.5;display:flex;align-items:center;justify-content:center;width:100%;contain:layout paint;content-visibility:auto}.playing-card{width:100%;height:100%;background:var(--surface, #f8f9fa);border:1px solid var(--border, #e5e5e7);border-radius:8px;display:flex;flex-direction:column;align-items:center;justify-content:center;position:relative;transition:all .2s ease;cursor:pointer}.playing-card-svg{padding:4px;overflow:hidden;border:none;background:transparent}.playing-card-svg:hover{border:none}.playing-card-img{width:100%;height:100%;object-fit:contain;display:block}.card-index-overlay{position:absolute;bottom:.25rem;left:.25rem}.playing-card:hover{transform:translateY(-2px);border-color:var(--accent, #007aff)}.card-value{font-size:1.2rem;font-weight:600;margin-bottom:.25rem;line-height:1}.card-suit{font-size:1.5rem;line-height:1;margin-bottom:.5rem}.card-index{position:absolute;bottom:.25rem;left:.25rem;font-size:.7rem;font-weight:600;color:var(--text-secondary, #666);background:var(--background, #fff);padding:.125rem .25rem;border-radius:4px;border:1px solid var(--border-light, #f0f0f3)}.playing-card.card-red .card-value,.playing-card.card-red .card-suit{color:#dc2626}.playing-card.card-black .card-value,.playing-card.card-black .card-suit{color:#1a1a1a}.app-container.dark .playing-card{background:var(--surface, #2a2a2a);border-color:var(--border, #404040)}.app-container.dark .playing-card.card-red .card-value,.app-container.dark .playing-card.card-red .card-suit{color:#ef4444}.app-container.dark .playing-card.card-black .card-value,.app-container.dark .playing-card.card-black .card-suit{color:#fff}.app-container.dark .card-index{background:var(--background, #1a1a1a);border-color:var(--border, #404040);color:var(--text-secondary, #ccc)}@media(max-width:480px){.stack-grid{grid-template-columns:repeat(3,1fr);gap:.5rem;max-width:300px}.playing-card{border-radius:6px}.card-value{font-size:1rem}.card-suit{font-size:1.25rem}.card-index{font-size:.6rem;padding:.1rem .2rem;bottom:.2rem;left:.2rem}}.practice-view{width:100%;max-width:480px;margin:0 auto;padding:.5rem .5rem 6rem;display:flex;flex-direction:column;gap:.75rem}@media(min-width:1024px){.practice-view{max-width:none;padding:0}}.selection-header{text-align:center;padding:.5rem 0 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#007aff26}.mode-card:active{transform:translateY(0)}.mode-name{font-size:1.1rem;font-weight:600;color:var(--text, #222);margin:0}.mode-description{font-size:.9rem;color:var(--text-secondary, #666);line-height:1.4;margin:0}.mode-stats{display:flex;align-items:center;gap:.5rem;font-size:.8rem;margin-top:.25rem}.mode-accuracy{color:var(--accent, #007aff);font-weight:600}.mode-attempts{color:var(--text-secondary, #888);font-weight:500}.mode-arrow{font-size:1.2rem;color:var(--text-secondary, #999);flex-shrink:0;transition:all .2s ease}.mode-card:hover .mode-arrow{color:var(--accent, #007aff);transform:translate(4px)}.practice-header{display:flex;align-items:center;gap:.75rem;padding:.25rem 0 .5rem;border-bottom:1px solid var(--border, #e5e5e7)}.back-button{display:flex;align-items:center;gap:.5rem;padding:.75rem 1rem;border:1px solid var(--border, #e5e5e7);border-radius:12px;background:var(--background, #ffffff);color:var(--text-secondary, 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.rank-btn:hover,body.dark .card-keyboard .suit-btn:hover:not(.disabled),.app-container.dark .rank-btn:hover,.app-container.dark .suit-btn:hover:not(.disabled){background:var(--accent-light, #1a365d)}@media(min-width:768px)and (max-width:1199px){.card-keyboard{left:72px;width:calc(100% - 72px);right:auto;bottom:calc(env(safe-area-inset-bottom) + 25px)}}@media(min-width:1200px){.card-keyboard{left:200px;width:calc(100% - 200px);right:auto;bottom:calc(env(safe-area-inset-bottom) + 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#007aff);color:#fff}.numeric-btn-submit:hover{background:var(--accent, #007aff);border-color:var(--accent, #007aff);opacity:.9}.numeric-btn-sign{font-size:1.25rem;font-weight:700}.numeric-btn-ok-wide{grid-column:1 / -1;width:100%;height:48px;min-height:44px;border-radius:12px;border:1.5px solid var(--border, #e5e5e7);background:var(--accent, #007aff);border-color:var(--accent, #007aff);color:#fff;font-size:1rem;font-weight:700;letter-spacing:.025em;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:background .15s,transform .1s;-webkit-tap-highlight-color:transparent;-webkit-user-select:none;user-select:none}.numeric-btn-ok-wide:active{transform:scale(.96)}body.dark .card-keyboard .numeric-btn-delete,.app-container.dark .numeric-btn-delete{color:#ef4444}body.dark .card-keyboard .numeric-btn-submit,.app-container.dark .numeric-btn-submit,body.dark .card-keyboard .numeric-btn-ok-wide,.app-container.dark .numeric-btn-ok-wide{background:var(--accent, #0a84ff);border-color:var(--accent, #0a84ff)}.practice-mode-selector{width:100%}.selection-header{text-align:center;margin-bottom:2rem;padding:0 1rem}.selection-title{font-size:2rem;font-weight:700;margin:0 0 .5rem;color:var(--text-color)}.selection-subtitle{font-size:1.125rem;color:var(--text-secondary);margin:0 0 1.5rem}.badge-progress-indicator{display:inline-flex;flex-direction:column;gap:.5rem;padding:.75rem 1.5rem;background:var(--card-bg);border:1px solid var(--border-color);border-radius:12px}.badge-progress-info{display:flex;align-items:center;gap:.5rem;font-size:.875rem;color:var(--text-secondary)}.badge-progress-icon{font-size:1.25rem}.badge-progress-bar-mini{width:200px;height:6px;background:var(--border-color);border-radius:3px;overflow:hidden}.badge-progress-fill-mini{height:100%;background:var(--primary-color);transition:width .3s ease}.mode-list{display:flex;flex-direction:column;gap:1rem;max-width:600px;margin:0 auto;padding:0 1rem}.mode-card{display:flex;align-items:center;gap:1rem;padding:1.5rem;background:var(--card-bg);border:2px solid var(--border-color);border-radius:16px;cursor:pointer;transition:all .2s ease;text-align:left;font-family:inherit;-webkit-tap-highlight-color:transparent;-webkit-touch-callout:none;-webkit-user-select:none;user-select:none}.mode-card:hover{border-color:var(--primary-color);transform:translateY(-2px);box-shadow:0 4px 12px #0000001a}.mode-card:focus-visible{outline:none;border-color:var(--primary-color);box-shadow:0 0 0 3px #6366f11a}.mode-card:focus:not(:focus-visible){outline:none}.mode-icon{font-size:2rem;line-height:1;flex-shrink:0}.mode-content{flex:1;display:flex;flex-direction:column;gap:.5rem}.mode-name{font-size:1.125rem;font-weight:600;color:var(--text-color)}.mode-description{font-size:.875rem;color:var(--text-secondary);line-height:1.4}.mode-stats{display:flex;align-items:center;gap:.5rem;font-size:.8125rem;margin-top:.25rem}.mode-accuracy{color:var(--primary-color);font-weight:600}.mode-attempts{color:var(--text-secondary)}.mode-arrow{font-size:1.5rem;color:var(--text-secondary);flex-shrink:0;transition:transform .2s ease}.mode-card:hover .mode-arrow{transform:translate(4px);color:var(--primary-color)}@media(max-width:768px){.selection-title{font-size:1.5rem}.selection-subtitle{font-size:1rem}.mode-card{padding:1.25rem}.mode-icon{font-size:1.75rem}.mode-name{font-size:1rem}}.toggle{position:relative;width:52px;height:28px;background:var(--border-color);border:none;border-radius:14px;cursor:pointer;transition:background-color .2s ease;flex-shrink:0;outline:none}.toggle:focus-visible{outline:2px solid var(--primary-color);outline-offset:2px}.toggle:disabled{opacity:.5;cursor:not-allowed}.toggle-slider{position:absolute;top:2px;left:2px;width:24px;height:24px;background:#fff;border-radius:50%;transition:transform .2s ease;box-shadow:0 2px 4px #0003}.toggle-active{background:var(--primary-color)}.toggle-active .toggle-slider{transform:translate(24px)}.practice-header{display:flex;align-items:center;gap:1rem;padding:1rem 1.5rem;background:var(--card-bg);border-bottom:1px solid var(--border-color);position:sticky;top:0;z-index:10}.back-button{display:inline-flex;align-items:center;justify-content:center;padding:.75rem;background:transparent;border:1px solid var(--border-color);border-radius:12px;color:var(--text-color);font-size:1.5rem;font-weight:400;cursor:pointer;transition:all .2s ease;font-family:inherit;min-width:48px;min-height:48px;-webkit-tap-highlight-color:transparent;-webkit-touch-callout:none;-webkit-user-select:none;user-select:none}.back-button:hover{background:var(--hover-bg);border-color:var(--primary-color);transform:translate(-2px)}.back-button:active{transform:translate(0)}.back-button:focus-visible{outline:none;border-color:var(--primary-color);box-shadow:0 0 0 3px #6366f11a}.back-button:focus:not(:focus-visible){outline:none}.practice-title{display:flex;align-items:center;gap:.75rem;flex:1;min-width:0;justify-content:center;margin-right:48px}.practice-options-wrap{position:relative;flex-shrink:0}.practice-options-button{display:inline-flex;align-items:center;justify-content:center;width:44px;height:44px;padding:0;background:transparent;border:1px solid var(--border-color);border-radius:12px;color:var(--text-color);font-size:1.25rem;cursor:pointer;transition:background .2s ease,border-color .2s ease;font-family:inherit;-webkit-tap-highlight-color:transparent}.practice-options-button:hover{background:var(--hover-bg);border-color:var(--primary-color)}.practice-options-button:focus-visible{outline:none;border-color:var(--primary-color);box-shadow:0 0 0 3px #6366f11a}.practice-options-button[aria-expanded=true]{background:var(--hover-bg);border-color:var(--primary-color)}.practice-options-dropdown{position:absolute;top:calc(100% + .5rem);right:0;min-width:220px;padding:.5rem 0;background:var(--card-bg);border:1px solid var(--border-color);border-radius:12px;box-shadow:0 8px 24px #0003;z-index:20}.practice-options-item{padding:0 1rem}.practice-options-item-row{display:flex;align-items:center;justify-content:space-between;gap:.75rem;padding:.625rem 1rem}.practice-options-label{font-size:.875rem;color:var(--text-color);white-space:nowrap}.practice-icon{font-size:1.75rem;line-height:1}.practice-name{font-size:1.25rem;font-weight:600;color:var(--text-color);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;min-width:0}.practice-title-names.has-short .practice-name-short{display:none}.practice-title-names.has-short .practice-name-full{display:inline}@media(max-width:768px){.practice-header{padding:.75rem 1rem}.back-button{padding:.625rem;font-size:1.25rem;min-width:44px;min-height:44px}.practice-icon{font-size:1.5rem}.practice-name{font-size:1.125rem}.practice-title{margin-right:44px}.practice-options-button{width:40px;height:40px;font-size:1.125rem}.practice-options-dropdown{min-width:200px;right:0;left:auto}}@media(max-width:480px){.practice-title-names.has-short .practice-name-full{display:none}.practice-title-names.has-short .practice-name-short{display:inline}}.stats-view{width:100%;max-width:1200px;margin:0 auto;padding:1rem;display:flex;flex-direction:column;gap:2rem}@media(min-width:1024px){.stats-view{padding:2rem}}.stats-grid{display:grid;grid-template-columns:1fr;gap:2rem}@media(min-width:1024px){.stats-grid{gap:2.5rem}}.stats-card{background:var(--card-bg, var(--surface, #f8f9fa));border:1px solid var(--border, #e5e5e7);border-radius:16px;overflow:hidden;transition:all .2s ease;box-shadow:0 2px 8px #0000000a}.stats-card:hover{box-shadow:0 4px 16px #00000014;transform:translateY(-1px)}.card-header{display:flex;align-items:center;gap:.75rem;padding:1.5rem 1.5rem 1rem;border-bottom:1px solid var(--border-light, #f0f0f3);background:var(--card-bg, var(--background, #fff))}.card-title{font-size:1.1rem;font-weight:600;color:var(--text, #222);margin:0}.card-content{padding:1.5rem;display:flex;flex-direction:column;gap:1.5rem;background:var(--card-bg, var(--background, #fff))}.overall-accuracy .accuracy-display{text-align:center}.accuracy-value{font-size:3.5rem;font-weight:800;color:var(--accent, #007aff);line-height:1;margin-bottom:1.5rem}.accuracy-details{display:flex;flex-direction:column;gap:.5rem;width:100%}.detail-item{display:flex;flex-direction:row;justify-content:space-between;align-items:center;width:100%;padding:.75rem 1rem;background:var(--surface, #f8f9fa);border-radius:8px;border:1px solid var(--border-light, #f0f0f3);box-sizing:border-box}.detail-value{font-size:1.25rem;font-weight:700;color:var(--text, #222);line-height:1}.detail-label{font-size:.85rem;color:var(--text-secondary, #666);font-weight:500;text-transform:uppercase;letter-spacing:.5px}.performance-metrics{display:flex;flex-direction:column;gap:.5rem;width:100%;margin-bottom:0}.metric{display:flex;flex-direction:row;justify-content:space-between;align-items:center;width:100%;padding:.75rem 1rem;background:var(--surface, #f8f9fa);border-radius:8px;border:1px solid var(--border-light, #f0f0f3);box-sizing:border-box}.metric-value{font-size:1.25rem;font-weight:700;color:var(--accent, #007aff);line-height:1}.metric-label{font-size:.8rem;color:var(--text-secondary, #666);font-weight:500;text-transform:uppercase;letter-spacing:.5px}.recent-attempts-section{padding:1.25rem;background:var(--surface, #f8f9fa);border-radius:12px;border:1px solid var(--border-light, #f0f0f3)}.attempts-label{font-size:.9rem;font-weight:600;color:var(--text-secondary, #666);margin-bottom:1rem;text-transform:uppercase;letter-spacing:.5px}.attempts-dots{display:flex;flex-wrap:wrap;gap:.5rem;justify-content:center}.attempt-dot{width:14px;height:14px;border-radius:50%;transition:all .2s ease;border:2px solid transparent}.attempt-dot.correct{background:var(--success, #059669)}.attempt-dot.incorrect{background:var(--error, #dc2626)}.attempt-dot:hover{transform:scale(1.2);border-color:var(--accent, #007aff)}.trend-section{display:flex;justify-content:space-between;align-items:center;padding:1.25rem;background:var(--surface, #f8f9fa);border-radius:12px;border:1px solid var(--border-light, #f0f0f3)}.trend-label{font-size:.9rem;font-weight:600;color:var(--text-secondary, #666);text-transform:uppercase;letter-spacing:.5px}.trend-value{font-size:.9rem;font-weight:600;color:var(--text, #222);padding:.5rem 1rem;background:var(--accent-light, #e3f2fd);border-radius:8px;border:1px solid var(--accent, #007aff)}.debug-section{display:flex;justify-content:center;margin-top:1rem}.debug-button{padding:.75rem 1.5rem;background:var(--accent, #007aff);color:#fff;border:none;border-radius:12px;font-size:.9rem;font-weight:600;cursor:pointer;transition:all .2s ease;box-shadow:0 2px 8px #007aff40}.debug-button:hover{background:var(--accent-hover, #0056cc);transform:translateY(-1px);box-shadow:0 4px 12px #007aff59}.app-container.dark .stats-card{background:var(--card-bg, #2a2a2a);border-color:var(--border, #404040)}.app-container.dark .card-header{background:var(--card-bg, #2a2a2a);border-bottom-color:var(--border, #404040)}.app-container.dark .card-title{color:var(--text, #fff)}.app-container.dark .card-content{background:var(--card-bg, #2a2a2a)}.app-container.dark .detail-item{background:var(--card-bg, #2a2a2a);border-color:var(--border, #404040)}.app-container.dark .detail-value{color:var(--text, #fff)}.app-container.dark .metric,.app-container.dark .recent-attempts-section,.app-container.dark .trend-section{background:var(--card-bg, #2a2a2a);border-color:var(--border, #404040)}.app-container.dark .trend-value{color:var(--text, #fff)}@media(max-width:640px){.stats-view{padding:1rem;gap:1.5rem}.stats-grid{gap:1.5rem}.card-header{padding:1.25rem 1.25rem 1rem}.card-content{padding:1.25rem;gap:1.25rem}.card-title{font-size:1rem}.accuracy-value{font-size:2.5rem}.detail-value,.metric-value{font-size:1.125rem}.recent-attempts-section{padding:1rem}.attempts-dots{gap:.375rem}.attempt-dot{width:12px;height:12px}.trend-section{padding:1rem}}.card{background:var(--card-bg);border:1px solid var(--border-color);border-radius:16px;overflow:hidden;transition:all .2s ease}.card-hoverable{cursor:pointer}.card-hoverable:hover{border-color:var(--primary-color);box-shadow:0 4px 12px #0000001a;transform:translateY(-2px)}.card-header{display:flex;align-items:center;gap:.75rem;padding:1.5rem;border-bottom:1px solid var(--border-color)}.card-icon{font-size:1.5rem;line-height:1}.card-title{font-size:1.125rem;font-weight:600;margin:0;color:var(--text-color)}.card-content{padding:1.5rem}.overall-accuracy-card{grid-column:span 1;align-self:start}.overall-accuracy-card .accuracy-display{display:flex;flex-direction:row;flex-wrap:wrap;align-items:center;justify-content:center;gap:1.5rem;width:100%}.overall-accuracy-card .accuracy-value{font-size:3.5rem;font-weight:700;color:var(--primary-color);line-height:1;margin:0}.overall-accuracy-card .accuracy-details{display:flex;flex-direction:row;flex-wrap:wrap;gap:.75rem;width:auto}.overall-accuracy-card .accuracy-details .detail-item{min-width:6rem}.overall-accuracy-card .detail-value{font-size:1.25rem;font-weight:700;color:var(--text-color)}@media(max-width:640px){.overall-accuracy-card .accuracy-display{flex-direction:column;align-items:stretch;gap:1rem}.overall-accuracy-card .accuracy-value{font-size:2.5rem;text-align:center}.overall-accuracy-card .accuracy-details{flex-direction:column;width:100%}.overall-accuracy-card .accuracy-details .detail-item{min-width:0}.overall-accuracy-card .detail-value{font-size:1.125rem}}.recent-performance-card{grid-column:span 1}.recent-performance-card .performance-metrics{width:100%;margin-bottom:1.5rem}.recent-performance-card .metric-value{color:var(--primary-color)}.recent-attempts-section{margin-bottom:1.5rem}.attempts-label{font-size:.875rem;color:var(--text-secondary);margin-bottom:.75rem}.attempts-dots{display:flex;flex-wrap:wrap;gap:.5rem}.attempt-dot{width:12px;height:12px;border-radius:50%;transition:transform .2s ease}.attempt-dot:hover{transform:scale(1.3)}.attempt-dot.correct{background:#10b981}.attempt-dot.incorrect{background:#ef4444}.trend-section{display:flex;align-items:center;justify-content:space-between;padding:1rem;background:var(--hover-bg);border-radius:12px}.trend-label{font-size:.875rem;font-weight:500;color:var(--text-secondary)}.trend-value{font-size:.9375rem;font-weight:600;color:var(--text-color)}@media(max-width:768px){.recent-performance-card .metric-value{font-size:1.125rem}.attempts-dots{gap:.375rem}.attempt-dot{width:10px;height:10px}}.mode-performance-card{min-width:0;width:100%;align-self:start}.mode-performance-header{display:flex;align-items:center;gap:.75rem;width:100%;padding:1.5rem;border:none;border-bottom:1px solid var(--border-color, var(--border-light, #f0f0f3));background:var(--card-bg, var(--background, #fff));font:inherit;color:inherit;cursor:pointer;text-align:left;transition:background .2s ease;-webkit-tap-highlight-color:transparent}.mode-performance-header:hover{background:var(--hover-bg, #f5f5f5)}.mode-performance-header:focus{outline:none}.mode-performance-header:focus-visible{outline:none}.mode-performance-header .card-icon{font-size:1.5rem;line-height:1}.mode-performance-header .card-title{flex:1;font-size:1.125rem;font-weight:600;margin:0;color:var(--text-color)}.mode-performance-chevron{font-size:.75rem;color:var(--text-secondary, #666);transition:transform .2s ease}.mode-performance-chevron-open{transform:rotate(180deg)}.mode-performance-content{padding:1.5rem;width:100%;box-sizing:border-box}.mode-list{display:flex;flex-direction:column;gap:1rem;width:100%}.mode-row{display:flex;align-items:center;gap:1rem;padding:.75rem;background:var(--card-bg, var(--hover-bg));border-radius:8px;transition:background .2s ease;width:100%;box-sizing:border-box}.mode-row:hover{background:var(--border-color)}.mode-info{display:flex;flex-direction:column;gap:.25rem;flex:0 0 200px}.mode-name{font-size:.9375rem;font-weight:500;color:var(--text-color)}.mode-attempts{font-size:.8125rem;color:var(--text-secondary)}.mode-accuracy-container{flex:1;display:flex;align-items:center;gap:.75rem;min-width:0}.mode-accuracy-track{flex:1;height:8px;border-radius:4px;background:#ffffff14;overflow:hidden;min-width:100px}.mode-accuracy-bar{height:100%;border-radius:4px;transition:width .3s ease,background .3s ease;min-width:2px}.mode-accuracy-bar.high{background:#10b981}.mode-accuracy-bar.medium{background:#f59e0b}.mode-accuracy-bar.low{background:#ef4444}.mode-accuracy-text{font-size:.875rem;font-weight:600;color:var(--text-color);min-width:45px;text-align:right}@media(max-width:768px){.mode-performance-card{grid-column:span 1}.mode-row{flex-direction:column;align-items:stretch;gap:.75rem}.mode-info{flex:1 1 auto}.mode-accuracy-track{min-width:0}.mode-accuracy-container{width:100%}}.last-session-card{grid-column:span 1;align-self:start}.last-session-content{display:flex;flex-direction:column;gap:1rem}.last-session-header-row{display:flex;align-items:center;justify-content:space-between;gap:.75rem;min-width:0}.last-session-mode{font-size:1rem;font-weight:600;color:var(--text-color, var(--text, #222));flex:1;min-width:0}.last-session-timestamp{font-size:.8125rem;color:var(--text-secondary, #666);flex-shrink:0;font-weight:500}.last-session-stats-strip{display:flex;flex-wrap:wrap;align-items:baseline;justify-content:center;gap:.5rem 1rem;text-align:center;padding:1rem 1.25rem;background:var(--surface, #f0f4f8);border-radius:12px;border:1px solid var(--border-light, #e8ecf1)}.last-session-duration{font-size:2rem;font-weight:700;color:var(--primary-color, var(--accent, #007aff));line-height:1}.last-session-accuracy{font-size:1.5rem;font-weight:700;color:var(--primary-color, var(--accent, #007aff));line-height:1}.last-session-accuracy.accuracy-high{color:var(--success, #10b981)}.last-session-accuracy.accuracy-medium{color:var(--warning, #f59e0b)}.last-session-accuracy.accuracy-low{color:var(--error, #ef4444)}.last-session-avg-per-answer{font-size:.875rem;font-weight:500;color:var(--text-secondary, #666)}.last-session-card .detail-item-correct{border-left:3px solid var(--success, #10b981)}.last-session-card .detail-item-wrong{border-left:3px solid var(--error, #ef4444)}.last-session-card .accuracy-details{width:100%}.last-session-card .detail-value{font-size:1.25rem;font-weight:700;color:var(--text-color, var(--text, #222))}@media(max-width:768px){.last-session-duration{font-size:1.5rem}.last-session-accuracy{font-size:1.25rem}.last-session-card .detail-value{font-size:1.125rem}}.app-container.dark .last-session-mode{color:var(--text-color, #fff)}.app-container.dark .last-session-timestamp,.app-container.dark .last-session-avg-per-answer{color:var(--text-secondary, #888)}.app-container.dark .last-session-stats-strip{background:var(--surface, #252528);border-color:var(--border, #404040)}.app-container.dark .last-session-card .detail-item{background:var(--surface, #2a2a2a);border-color:var(--border, #404040)}.app-container.dark .last-session-card .detail-value{color:var(--text-color, #fff)}.session-history-card{align-self:start;width:100%}.session-history-header{display:flex;align-items:center;gap:.75rem;width:100%;padding:1.5rem;border:none;border-bottom:1px solid var(--border-color, var(--border-light, #f0f0f3));background:var(--card-bg, var(--background, #fff));font:inherit;color:inherit;cursor:pointer;text-align:left;transition:background .2s ease;-webkit-tap-highlight-color:transparent}.session-history-header:hover{background:var(--hover-bg, #f5f5f5)}.session-history-header:focus{outline:none}.session-history-header:focus-visible{outline:none}.session-history-header .card-icon{font-size:1.5rem;line-height:1}.session-history-header .card-title{flex:1;font-size:1.125rem;font-weight:600;margin:0;color:var(--text-color)}.session-history-chevron{font-size:.75rem;color:var(--text-secondary, #666);transition:transform .2s ease}.session-history-chevron-open{transform:rotate(180deg)}.session-history-content{padding:1.5rem}.session-history-list{display:flex;flex-direction:column;gap:.75rem;max-height:420px;overflow-y:auto;padding-right:.25rem}.session-history-list::-webkit-scrollbar{width:6px}.session-history-list::-webkit-scrollbar-track{background:var(--card-bg, var(--surface, #f8f9fa));border-radius:3px}.session-history-list::-webkit-scrollbar-thumb{background:var(--border-color, #e5e5e7);border-radius:3px}.session-row{display:flex;align-items:center;justify-content:space-between;gap:1rem;padding:.75rem 1rem;background:var(--card-bg, var(--surface, #f8f9fa));border:1px solid var(--border-light, #f0f0f3);border-radius:12px;border-left-width:4px;border-left-style:solid;border-left-color:var(--border-light, 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solid var(--border-light, #f0f0f3);border-radius:4px;font-size:.5625rem;font-weight:600;color:var(--text-secondary, #999);cursor:pointer;font-family:inherit;padding:0;-webkit-tap-highlight-color:transparent}.mini-cell.filled{background:var(--accent-light, #e3f2fd);color:var(--accent, #007aff)}.mini-cell.selected{background:var(--accent, #007aff);border-color:var(--accent, #007aff);color:#fff}@media(min-width:768px){.builder-main{flex-direction:row;align-items:flex-start;padding:1.5rem 2rem;gap:2rem}.position-grid-section{flex:1;max-width:500px;min-height:fit-content}.card-selector-section{flex:1;max-width:500px;position:sticky;align-self:flex-start;min-height:fit-content}.position-grid-section .section-header,.card-selector-section .section-header{height:2.5rem;display:flex;align-items:center;margin-bottom:.75rem}.position-grid{grid-template-columns:repeat(8,1fr)}}@media(min-width:1024px){.builder-header{padding:1rem 2rem}.name-section,.progress-section{padding-left:2rem;padding-right:2rem}.builder-main{padding:2rem;max-width:1200px;margin:0 auto}.position-cell{padding:.375rem}.position-num{font-size:.6875rem}.position-card-value{font-size:.8125rem}.rank-btn{min-width:2.5rem;height:2.5rem;font-size:.9375rem}}.stack-builder-page.dark .builder-header{background:var(--background);border-color:var(--border)}.stack-builder-page.dark .name-section,.stack-builder-page.dark .progress-section{background:var(--background)}.stack-builder-page.dark .progress-bar{background:var(--border)}.stack-builder-page.dark .position-grid-section,.stack-builder-page.dark .card-selector-section,.stack-builder-page.dark .mobile-position-nav{background:var(--surface);border-color:var(--border)}.stack-builder-page.dark .position-cell{background:var(--background);border-color:var(--border)}.stack-builder-page.dark .position-cell.selected{background:var(--accent-light)}.stack-builder-page.dark .rank-btn{background:var(--background);border-color:var(--border)}.stack-builder-page.dark .rank-btn:hover:not(:disabled){background:var(--accent-light)}.stack-builder-page.dark .nav-btn{background:var(--background);border-color:var(--border)}.stack-builder-page.dark .nav-btn:hover{background:var(--accent-light)}.stack-builder-page.dark .mobile-position-grid{background:var(--background);border-color:var(--border)}.stack-builder-page.dark .mini-cell{background:var(--surface);border-color:var(--border)}.stack-builder-page.dark .mini-cell.filled{background:var(--accent-light)}.stack-builder-page.dark .suit-symbol.spades,.stack-builder-page.dark .suit-symbol.clubs{color:var(--text)}.stack-builder-page.dark .suit-symbol.hearts,.stack-builder-page.dark .suit-symbol.diamonds{color:#ef4444}.stack-builder-page.dark .clear-all-btn,.stack-builder-page.dark .clear-btn{border-color:var(--border);color:var(--text-secondary)}.stack-builder-page.dark .clear-all-btn:hover,.stack-builder-page.dark .clear-btn:hover{background:#dc262626}