:root{--color-primary: #2196F3;--color-primary-dark: #1976D2;--color-accent: #FF5722;--color-accent-dark: #E64A19;--color-success: #4CAF50;--color-warning: #FF9800;--color-error: #F44336;--color-info: #2196F3;--color-bg: #FFFFFF;--color-bg-secondary: #F5F5F5;--color-text: #212121;--color-text-secondary: #757575;--color-border: #E0E0E0;--color-cell-inactive-bg: #E0E0E0;--color-cell-inactive-text: #757575;--color-cell-active-bg: #2196F3;--color-cell-active-text: #FFFFFF;--color-cell-current-bg: #FF5722;--color-cell-current-text: #FFFFFF;--spacing-xs: .25rem;--spacing-sm: .5rem;--spacing-md: 1rem;--spacing-lg: 1.5rem;--spacing-xl: 2rem;--font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, sans-serif;--font-size-base: 1rem;--font-size-sm: .875rem;--font-size-lg: 1.25rem;--font-size-xl: 1.5rem;--font-size-number: 7.5rem;--font-size-grid: 1.5rem;--border-radius: .5rem;--border-radius-sm: .25rem;--border-radius-lg: 1rem;--shadow-sm: 0 1px 3px rgba(0, 0, 0, .12);--shadow-md: 0 4px 6px rgba(0, 0, 0, .1);--shadow-lg: 0 10px 20px rgba(0, 0, 0, .15);--transition-fast: .15s ease;--transition-normal: .2s ease;--transition-slow: .3s ease;--z-banner: 100;--z-modal: 200;--z-toast: 300}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{font-size:16px;scroll-behavior:smooth}body{font-family:var(--font-family);font-size:var(--font-size-base);color:var(--color-text);background-color:var(--color-bg);line-height:1.5;min-height:100vh;display:flex;flex-direction:column}.visually-hidden{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.skip-link{position:absolute;top:-100%;left:0;z-index:1000;padding:var(--spacing-sm) var(--spacing-md);background:var(--color-primary);color:#fff;text-decoration:none;border-radius:0 0 var(--border-radius) 0}.skip-link:focus{top:0}.btn{display:inline-flex;align-items:center;justify-content:center;padding:var(--spacing-sm) var(--spacing-lg);border:none;border-radius:var(--border-radius);font-size:var(--font-size-base);font-weight:600;cursor:pointer;transition:all var(--transition-normal);min-height:2.75rem;min-width:2.75rem}.btn:disabled{opacity:.5;cursor:not-allowed}.btn--primary{background:var(--color-primary);color:#fff}.btn--primary:hover:not(:disabled){background:var(--color-primary-dark);transform:scale(1.02)}.btn--secondary{background:var(--color-bg-secondary);color:var(--color-text);border:1px solid var(--color-border)}.btn--secondary:hover:not(:disabled){background:var(--color-border)}.btn--danger{background:var(--color-error);color:#fff}.btn--danger:hover:not(:disabled){background:#d32f2f}#app{display:flex;flex-direction:column;min-height:100vh;max-width:1200px;margin:0 auto;width:100%;padding:var(--spacing-md)}.keyboard-flash{box-shadow:0 0 8px 2px var(--color-primary)!important;transition:box-shadow .1s ease!important}.grid{display:flex;flex-direction:column;gap:.5rem;padding:var(--spacing-md) 0}.grid__row{display:flex;gap:.5rem;justify-content:center}.grid-cell{width:3.75rem;height:3.75rem;display:flex;align-items:center;justify-content:center;border-radius:var(--border-radius);font-size:var(--font-size-grid);font-weight:600;transition:all var(--transition-normal);cursor:default;user-select:none;position:relative}.grid-cell--inactive{background:var(--color-cell-inactive-bg);color:var(--color-cell-inactive-text);opacity:.6}.grid-cell--active{background:var(--color-cell-active-bg);color:var(--color-cell-active-text);opacity:1;font-weight:700}.grid-cell--current{background:var(--color-cell-current-bg);color:var(--color-cell-current-text);animation:pulse 1s infinite;z-index:1}.grid-cell--silent:after{content:"🔇";position:absolute;top:-4px;right:-4px;font-size:.75rem}@keyframes pulse{0%,to{transform:scale(1)}50%{transform:scale(1.1)}}@media(hover:hover){.grid-cell:hover{transform:scale(1.05);box-shadow:var(--shadow-sm)}}.header__content{display:flex;align-items:center;justify-content:space-between;padding:var(--spacing-sm) 0;border-bottom:1px solid var(--color-border)}.header__title{font-size:var(--font-size-xl);font-weight:700;color:var(--color-primary)}.header__controls{display:flex;gap:var(--spacing-sm);align-items:center}.header__select{padding:var(--spacing-xs) var(--spacing-sm);border:1px solid var(--color-border);border-radius:var(--border-radius-sm);font-size:var(--font-size-sm);background:var(--color-bg)}.header__settings-btn{background:none;border:none;font-size:1.5rem;cursor:pointer;padding:var(--spacing-xs);border-radius:var(--border-radius-sm);transition:background var(--transition-fast)}.header__settings-btn:hover{background:var(--color-bg-secondary)}.header__donate-btn{display:inline-flex;align-items:center;gap:var(--spacing-xs);padding:var(--spacing-xs) var(--spacing-md);background:linear-gradient(135deg,#ff6b6b,#ee5a24);color:#fff;border:none;border-radius:var(--border-radius);font-size:var(--font-size-sm);font-weight:600;cursor:pointer;transition:all var(--transition-fast);white-space:nowrap}.header__donate-btn:hover{background:linear-gradient(135deg,#ee5a24,#d63031);transform:scale(1.05);box-shadow:var(--shadow-sm)}.display__container{text-align:center;padding:var(--spacing-xl) 0;min-height:12rem;display:flex;flex-direction:column;align-items:center;justify-content:center}.display__status{font-size:var(--font-size-lg);margin-bottom:var(--spacing-sm);min-height:1.75rem}.display__status--playing{color:var(--color-primary);animation:blink 1.5s infinite}@keyframes blink{0%,to{opacity:1}50%{opacity:.5}}.display__number-text{font-size:var(--font-size-number);font-weight:700;line-height:1;transition:all var(--transition-normal)}.display__number-text--ready{color:var(--color-text-secondary);font-size:3rem}.display__number-text--playing{color:var(--color-primary);opacity:.6}.display__number-text--current{color:var(--color-accent);animation:fadeIn .2s ease-out}.display__number-text--dimmed{color:var(--color-text-secondary);opacity:.5}@keyframes fadeIn{0%{opacity:0;transform:scale(.8)}to{opacity:1;transform:scale(1)}}.display__progress{width:60%;max-width:300px;margin-top:var(--spacing-sm)}.display__progress-bar{height:4px;background:var(--color-border);border-radius:2px;overflow:hidden}.display__progress-fill{height:100%;background:var(--color-primary);transition:width 1s linear}.display__skip-btn{margin-top:var(--spacing-md);padding:var(--spacing-xs) var(--spacing-lg);background:var(--color-warning);color:#fff;border:none;border-radius:var(--border-radius);font-size:var(--font-size-sm);cursor:pointer;transition:background var(--transition-fast)}.display__skip-btn:hover{background:#f57c00}.controls__container{display:flex;align-items:center;justify-content:center;gap:var(--spacing-md);padding:var(--spacing-md) 0;flex-wrap:wrap}.controls__btn{padding:var(--spacing-sm) var(--spacing-lg);border:none;border-radius:var(--border-radius);font-size:var(--font-size-base);font-weight:600;cursor:pointer;transition:all var(--transition-normal);min-height:3.75rem}.controls__btn:disabled{opacity:.4;cursor:not-allowed}.controls__btn--prev{background:var(--color-bg-secondary);color:var(--color-text-secondary);border:1px solid var(--color-border)}.controls__btn--next{background:var(--color-primary);color:#fff;min-width:12.5rem;font-size:var(--font-size-lg)}.controls__btn--next:hover:not(:disabled){background:var(--color-primary-dark);transform:scale(1.02)}.controls__btn--next kbd{font-size:var(--font-size-sm);opacity:.7;margin-left:var(--spacing-xs)}.controls__btn--autoplay{background:var(--color-bg-secondary);color:var(--color-text);border:2px solid var(--color-border)}.controls__btn--autoplay-on{background:var(--color-success);color:#fff;border-color:var(--color-success)}.controls__autoplay{display:flex;flex-direction:column;align-items:center;gap:var(--spacing-xs)}.controls__countdown{font-size:var(--font-size-sm);color:var(--color-text-secondary)}.status__container{display:flex;flex-direction:column;gap:var(--spacing-sm);padding:var(--spacing-sm) 0;border-top:1px solid var(--color-border)}.status__main-row{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:var(--spacing-sm)}.status__left{display:flex;align-items:center;gap:var(--spacing-md);flex-wrap:wrap}.status__right{display:flex;align-items:center;gap:var(--spacing-sm)}.status__info{font-size:var(--font-size-sm);color:var(--color-text-secondary)}.status__social-row{display:flex;justify-content:center;align-items:center;padding-top:var(--spacing-xs);border-top:1px solid var(--color-border);margin-top:var(--spacing-xs)}.status__social{display:flex;align-items:center;gap:var(--spacing-sm)}.status__social-link{display:inline-flex;align-items:center;justify-content:center;width:2.5rem;height:2.5rem;text-decoration:none;border-radius:var(--border-radius-sm);transition:all var(--transition-fast);background:var(--color-bg-secondary);color:var(--color-text-secondary)}.status__social-link svg{width:20px;height:20px;transition:transform var(--transition-fast)}.status__social-link:hover{transform:translateY(-2px);box-shadow:var(--shadow-sm)}.status__social-link:hover svg{transform:scale(1.1)}.status__social-link--facebook{color:#1877f2}.status__social-link--facebook:hover{background:#1877f2;color:#fff}.status__social-link--youtube{color:red}.status__social-link--youtube:hover{background:red;color:#fff}.status__social-link--zalo{color:#0180c7}.status__social-link--zalo:hover{background:#0180c7;color:#fff}.status__reset-btn{padding:var(--spacing-xs) var(--spacing-md);background:none;color:var(--color-error);border:1px solid var(--color-error);border-radius:var(--border-radius);font-size:var(--font-size-sm);cursor:pointer;transition:all var(--transition-fast)}.status__reset-btn:hover{background:var(--color-error);color:#fff}.modal{border:none;border-radius:var(--border-radius-lg);padding:0;max-width:500px;width:90%;box-shadow:var(--shadow-lg);animation:modalSlideIn .2s ease-out;position:fixed;top:50%;left:50%;transform:translate(-50%,-50%);margin:0}.modal::backdrop{background:#00000080;animation:fadeIn .2s ease}@keyframes modalSlideIn{0%{transform:translateY(-20px);opacity:0}to{transform:translateY(0);opacity:1}}.modal__content{padding:var(--spacing-lg)}.modal__header{display:flex;justify-content:space-between;align-items:center;margin-bottom:var(--spacing-md)}.modal__header h2{font-size:var(--font-size-xl)}.modal__close-btn{background:none;border:none;font-size:1.5rem;cursor:pointer;padding:var(--spacing-xs);color:var(--color-text-secondary);border-radius:var(--border-radius-sm)}.modal__close-btn:hover{background:var(--color-bg-secondary)}.modal__body{margin-bottom:var(--spacing-lg);max-height:60vh;overflow-y:auto}.modal__footer{display:flex;justify-content:flex-end;gap:var(--spacing-sm);padding-top:var(--spacing-md);border-top:1px solid var(--color-border)}.settings__field{margin-bottom:var(--spacing-md)}.settings__field label{display:block;font-weight:600;margin-bottom:var(--spacing-xs);font-size:var(--font-size-sm);color:var(--color-text-secondary)}.settings__field select,.settings__field input[type=number]{width:100%;padding:var(--spacing-sm);border:1px solid var(--color-border);border-radius:var(--border-radius-sm);font-size:var(--font-size-base)}.settings__field input[type=range]{width:100%}.settings__style-row{display:flex;gap:var(--spacing-sm);align-items:center}.settings__style-row select{flex:1}.settings__preview-btn{padding:var(--spacing-sm);background:var(--color-bg-secondary);border:1px solid var(--color-border);border-radius:var(--border-radius-sm);cursor:pointer;font-size:var(--font-size-sm);white-space:nowrap;transition:all .2s ease}.settings__preview-btn:hover:not(:disabled){background:var(--color-primary);color:#fff;border-color:var(--color-primary)}.settings__preview-btn:disabled{cursor:not-allowed;opacity:.6}.settings__preview-btn--playing{background:var(--color-info);color:#fff;border-color:var(--color-info);animation:pulse 1.5s ease-in-out infinite}@keyframes pulse{0%,to{opacity:1}50%{opacity:.7}}.settings__range-row{display:grid;grid-template-columns:auto 1fr auto 1fr;gap:var(--spacing-sm);align-items:center}.settings__range-row label{margin-bottom:0}.settings__range-row input{width:100%!important}.settings__error{color:var(--color-error);font-size:var(--font-size-sm);margin-top:var(--spacing-xs)}.settings__warning{color:var(--color-warning);font-size:var(--font-size-sm);margin-top:var(--spacing-xs)}.settings__info{color:var(--color-info);font-size:var(--font-size-sm);font-style:italic}.completion__summary p{margin:var(--spacing-xs) 0}.history__body{max-height:50vh}.history__table{width:100%;border-collapse:collapse}.history__table th,.history__table td{padding:var(--spacing-xs) var(--spacing-sm);text-align:center;border-bottom:1px solid var(--color-border)}.history__table th{font-weight:600;background:var(--color-bg-secondary);position:sticky;top:0}.modal--guideline{max-width:600px}.guideline__body{max-height:65vh;overflow-y:auto}.guideline__section{margin-bottom:var(--spacing-lg)}.guideline__section:last-child{margin-bottom:0}.guideline__section-title{font-size:var(--font-size-lg);font-weight:600;margin-bottom:var(--spacing-sm);color:var(--color-primary)}.guideline__text{font-size:var(--font-size-base);line-height:1.6;color:var(--color-text)}.guideline__text p{margin-bottom:var(--spacing-sm)}.guideline__text ul{margin:var(--spacing-sm) 0;padding-left:var(--spacing-lg)}.guideline__text li{margin-bottom:var(--spacing-xs);line-height:1.5}.guideline__close-btn{padding:var(--spacing-sm) var(--spacing-lg)}.modal--donate{max-width:450px}.donate__body{text-align:center}.donate__message{font-size:var(--font-size-base);line-height:1.6;color:var(--color-text);margin-bottom:var(--spacing-lg)}.donate__qr-container{display:flex;flex-direction:column;align-items:center;gap:var(--spacing-sm);margin-bottom:var(--spacing-lg);padding:var(--spacing-md);background:var(--color-bg-secondary);border-radius:var(--border-radius);border:1px solid var(--color-border)}.donate__qr-image{max-width:200px;max-height:200px;width:100%;height:auto;border-radius:var(--border-radius-sm)}.donate__scan-text{font-size:var(--font-size-sm);color:var(--color-text-secondary);font-style:italic}.donate__thank-you{font-size:var(--font-size-lg);font-weight:600;color:var(--color-primary);margin-bottom:var(--spacing-sm)}.donate__close-btn{padding:var(--spacing-sm) var(--spacing-lg)}.keyboard-help__table{width:100%}.keyboard-help__table td{padding:var(--spacing-sm)}.keyboard-help__table kbd{background:var(--color-bg-secondary);border:1px solid var(--color-border);border-radius:var(--border-radius-sm);padding:2px 8px;font-family:monospace;font-size:var(--font-size-sm)}.toast-container{position:fixed;top:var(--spacing-md);right:var(--spacing-md);z-index:var(--z-toast);display:flex;flex-direction:column;gap:var(--spacing-sm);max-width:400px}.toast{display:flex;align-items:center;gap:var(--spacing-sm);padding:var(--spacing-sm) var(--spacing-md);border-radius:var(--border-radius);box-shadow:var(--shadow-md);font-size:var(--font-size-sm);opacity:0;transform:translate(100%);transition:all var(--transition-slow);background:#fff}.toast--visible{opacity:1;transform:translate(0)}.toast--fade-out{opacity:0;transform:translate(100%)}.toast--success{border-left:4px solid var(--color-success)}.toast--info{border-left:4px solid var(--color-info)}.toast--warning{border-left:4px solid var(--color-warning)}.toast--error{border-left:4px solid var(--color-error)}.toast__icon{font-size:1.25rem;flex-shrink:0}.toast__message{flex:1}.toast__close{background:none;border:none;font-size:1.25rem;cursor:pointer;padding:0 var(--spacing-xs);color:var(--color-text-secondary);line-height:1}.toast__close:hover{color:var(--color-text)}@media(max-width:479px){:root{--font-size-number: 5rem;--font-size-grid: 1.125rem}.grid-cell{width:2.5rem;height:2.5rem}.grid__row{gap:.25rem}.header__content{flex-direction:column;gap:var(--spacing-sm);text-align:center}.header__controls{flex-wrap:wrap;justify-content:center}.controls__container{flex-direction:column}.controls__btn--next{width:100%}.status__main-row{flex-direction:column;align-items:stretch}.status__left,.status__right{justify-content:center;width:100%}.status__social-row{padding-top:var(--spacing-sm)}.status__social-link{width:2.75rem;height:2.75rem}.status__social-link svg{width:22px;height:22px}.toast-container{top:auto;bottom:var(--spacing-md);right:var(--spacing-md);left:var(--spacing-md);max-width:none}}@media(min-width:480px)and (max-width:767px){:root{--font-size-number: 5rem;--font-size-grid: 1.25rem}.grid-cell{width:3.125rem;height:3.125rem}.grid__row{gap:.375rem}}@media(max-width:767px)and (orientation:landscape){#app{flex-direction:row;flex-wrap:wrap}.display__container{padding:var(--spacing-sm) 0;min-height:8rem}:root{--font-size-number: 4rem}}@media(min-width:768px){.grid-cell{width:3.75rem;height:3.75rem}}*:focus{outline:2px solid var(--color-primary);outline-offset:2px}*:focus:not(:focus-visible){outline:none}*:focus-visible{outline:2px solid var(--color-primary);outline-offset:2px}@media(prefers-contrast:high){.grid-cell--active{border:3px solid currentColor;background:Highlight;color:HighlightText}.grid-cell--current{border:3px solid currentColor}*:focus-visible{outline:3px solid Highlight}}@media(forced-colors:active){.grid-cell{border:1px solid CanvasText}.grid-cell--active{background:Highlight;color:HighlightText}.grid-cell--current{background:Mark;color:MarkText}.btn--primary{border:2px solid ButtonText}}@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}.grid-cell--current{animation:none;box-shadow:0 0 0 4px var(--color-accent)}.display__status--playing{animation:none}}.no-animations *,.no-animations *:before,.no-animations *:after{animation-duration:.01ms!important;transition-duration:.01ms!important}.banner{position:sticky;top:0;z-index:var(--z-banner);display:flex;align-items:center;gap:var(--spacing-sm);padding:var(--spacing-sm) var(--spacing-md);font-size:var(--font-size-sm)}.banner--emergency{background:#fff3cd;border:1px solid #FFE69C;color:#664d03}.banner--warning{background:#ffe0b2;border:1px solid #FFB74D;color:#e65100}.banner__content{flex:1}.banner__content p{margin:0}.banner__btn{padding:var(--spacing-xs) var(--spacing-sm);background:#0000001a;border:1px solid rgba(0,0,0,.2);border-radius:var(--border-radius-sm);cursor:pointer;font-size:var(--font-size-sm);white-space:nowrap}.banner__btn:hover{background:#0003}