:root{--bg-primary: #1a1a2e;--bg-secondary: #16213e;--bg-card: #0f3460;--color-add: #00d26a;--color-subtract: #ff6b6b;--color-neutral: #e94560;--text-primary: #ffffff;--text-secondary: #a0a0a0;--text-muted: #6b6b6b;--btn-item-bg: #1e3a5f;--btn-item-active: #2d5a87;--btn-num-bg: #2d3748;--btn-num-active: #4a5568;--border-color: rgba(255,255,255,.1);--spacing-xs: 4px;--spacing-sm: 8px;--spacing-md: 16px;--spacing-lg: 24px;--radius-sm: 8px;--radius-md: 12px;--radius-lg: 16px}*{margin:0;padding:0;box-sizing:border-box;-webkit-tap-highlight-color:transparent}html,body{height:100%;width:100%;overflow:hidden}body{font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;background-color:var(--bg-primary);color:var(--text-primary);font-size:16px;line-height:1.4;touch-action:manipulation}button,.btn,.item-btn,.num-btn{user-select:none;-webkit-user-select:none}*:focus:not(:focus-visible){outline:none!important;box-shadow:none!important}.text-add{color:var(--color-add)}.text-subtract{color:var(--color-subtract)}.bg-add{background-color:var(--color-add)}.bg-subtract{background-color:var(--color-subtract)}@keyframes pop{0%{transform:scale(1)}50%{transform:scale(.95)}to{transform:scale(1)}}.pop{animation:pop .1s ease-out}@keyframes slideUp{0%{transform:translateY(100%);opacity:0}to{transform:translateY(0);opacity:1}}.slide-up{animation:slideUp .2s ease-out}