:root{--bg-primary: #0F172A;--bg-secondary: #1E293B;--bg-tertiary: #334155;--text-primary: #F8FAFC;--text-secondary: #94A3B8;--text-muted: #64748B;--accent-primary: #06B6D4;--accent-hover: #0891B2;--accent-glow: rgba(6, 182, 212, .3);--success: #10B981;--warning: #F59E0B;--danger: #EF4444;--beat-strong: #06B6D4;--beat-weak: #94A3B8;--beat-current: #F8FAFC;--space-xs: 4px;--space-sm: 8px;--space-md: 16px;--space-lg: 24px;--space-xl: 32px;--space-2xl: 48px;--radius-sm: 6px;--radius-md: 12px;--radius-lg: 16px;--radius-xl: 24px;--radius-full: 9999px;--ease-out: cubic-bezier(0, 0, .2, 1);--ease-in-out: cubic-bezier(.4, 0, .2, 1);--transition-fast: .15s var(--ease-out);--transition-normal: .3s var(--ease-out);--transition-slow: .5s var(--ease-out);--shadow-sm: 0 1px 3px rgba(0, 0, 0, .2);--shadow-md: 0 4px 12px rgba(0, 0, 0, .3);--shadow-lg: 0 8px 24px rgba(0, 0, 0, .4);--shadow-glow: 0 0 20px var(--accent-glow);--shadow-glow-strong: 0 0 40px var(--accent-glow)}*{margin:0;padding:0;box-sizing:border-box}html{font-size:16px;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Hiragino Sans GB,Microsoft YaHei,sans-serif;background:linear-gradient(180deg,var(--bg-primary) 0%,var(--bg-secondary) 100%);min-height:100vh;color:var(--text-primary);line-height:1.5}::-webkit-scrollbar{width:8px;height:8px}::-webkit-scrollbar-track{background:var(--bg-tertiary);border-radius:4px}::-webkit-scrollbar-thumb{background:var(--accent-primary);border-radius:4px}::-webkit-scrollbar-thumb:hover{background:var(--accent-hover)}::selection{background:var(--accent-primary);color:#fff}*{-webkit-tap-highlight-color:transparent}:focus-visible{outline:2px solid var(--accent-primary);outline-offset:2px}button{border:none;background:none;cursor:pointer;font-family:inherit;color:inherit}input,textarea,select{font-family:inherit;color:inherit;background:var(--bg-primary);border:1px solid var(--bg-tertiary);border-radius:var(--radius-sm);padding:var(--space-sm) var(--space-md);outline:none;transition:border-color var(--transition-normal)}input:focus,textarea:focus,select:focus{border-color:var(--accent-primary);box-shadow:var(--shadow-glow)}img{max-width:100%;height:auto;display:block}a{color:var(--accent-primary);text-decoration:none;transition:color var(--transition-fast)}a:hover{color:var(--accent-hover)}