:root{--radius-s:0.75rem;--radius-l:1.5rem;--gap-s:1rem;--gap-l:2rem;--text-xs:0.875rem;--text-sm:1.1rem;--text-md:1.5rem;--glass-bg:rgba(255,255,255,0.05);--glass-border:rgba(255,255,255,0.12);--glass-blur:12px;--primary-color:#a29bfe;--secondary-color:#6c5ce7;--text-primary:#ffffff;--text-secondary:rgba(255,255,255,0.65);}
*,*::before,*::after{box-sizing:border-box;}
.glass{background:var(--glass-bg);border:1px solid var(--glass-border);backdrop-filter:blur(var(--glass-blur));-webkit-backdrop-filter:blur(var(--glass-blur));}
.about-wrap{max-width:800px;margin:10vh auto 0;padding:2rem;text-align:center;border-radius:var(--radius-l);composes:glass;}
.about-title{font-size:3rem;font-weight:700;background:linear-gradient(135deg,var(--primary-color),var(--secondary-color));-webkit-background-clip:text;-webkit-text-fill-color:transparent;margin-bottom:1.5rem;}
.about-desc{font-size:var(--text-sm);color:var(--text-secondary);line-height:1.8;margin-bottom:2rem;}
.intro-section{composes:glass;border-radius:var(--radius-l);padding:1.8rem 2.2rem;margin-bottom:var(--gap-l);width:100%;overflow:auto;}
.intro-section h2{font-size:var(--text-md);margin-bottom:var(--gap-s);text-align:left;padding-left:0.5rem;}
.intro-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:1rem;margin-top:1.5rem;width:100%;}
.intro-item{background:rgba(255,255,255,0.04);border:1px solid rgba(255,255,255,0.08);border-radius:0.85rem;padding:1.2rem 0.8rem;text-align:center;min-height:100px;display:flex;flex-direction:column;justify-content:center;transition:transform 0.2s ease,box-shadow 0.2s ease;will-change:transform;box-shadow:0 3px 8px rgba(0,0,0,0.06);}
.intro-item:hover{transform:translateY(-3px) scale(1.03);box-shadow:0 6px 15px rgba(0,0,0,0.1);}
.intro-item span{display:block;font-size:0.9rem;color:var(--text-secondary);margin-bottom:0.5rem;font-weight:500;}
.intro-item strong{font-size:1.3rem;color:var(--text-primary);font-weight:700;}
.charts-container{display:grid;grid-template-columns:1fr;gap:1.5rem;margin-top:1.5rem;width:100%;}
.chart-card{composes:glass;border-radius:var(--radius-l);padding:1.8rem 2rem;height:360px;display:flex;flex-direction:column;width:100%;transition:transform 0.3s ease,box-shadow 0.3s ease;will-change:transform;}
.chart-card:hover{transform:translateY(-5px);box-shadow:0 10px 30px rgba(0,0,0,0.2);}
.gradient-purple{background:linear-gradient(135deg,rgba(162,155,254,0.15),rgba(162,155,254,0.05));border-color:rgba(162,155,254,0.2);}
.chart-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:1.2rem;padding-bottom:0.8rem;border-bottom:1px solid rgba(255,255,255,0.1);width:100%;}
.chart-header h3{font-size:1.3rem;font-weight:600;color:var(--text-primary);display:flex;align-items:center;gap:0.6rem;}
.chart-header h3 i{font-size:1.2rem;color:rgba(162,155,254,0.9);}
.chart-body{flex:1;position:relative;min-height:230px;width:100%;overflow:auto;}
.rank-chart{height:100%;display:flex;flex-direction:column;gap:1rem;padding:0.5rem 0.3rem 0.5rem 0;width:100%;}
.rank-item{display:flex;align-items:center;gap:1rem;padding:0.9rem 0.8rem;border-radius:10px;background:rgba(255,255,255,0.05);transition:all 0.3s ease;cursor:pointer;width:100%;}
.rank-item:hover{transform:translateX(5px);background:rgba(255,255,255,0.15);}
.rank-number{width:32px;height:32px;display:flex;align-items:center;justify-content:center;border-radius:50%;font-size:1rem;font-weight:700;background:rgba(162,155,254,0.3);color:rgba(162,155,254,1);flex-shrink:0;}
.rank-item:nth-child(1) .rank-number{background:rgba(255,193,7,0.3);color:rgba(255,193,7,1);}
.rank-item:nth-child(2) .rank-number{background:rgba(200,200,200,0.3);color:rgba(200,200,200,1);}
.rank-item:nth-child(3) .rank-number{background:rgba(205,127,50,0.3);color:rgba(205,127,50,1);}
.rank-info{flex:1;min-width:120px;overflow:hidden;}
.rank-name{font-size:1rem;font-weight:500;color:var(--text-primary);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;padding-right:0.5rem;}
.rank-bar{flex:2.5;height:10px;background:rgba(255,255,255,0.1);border-radius:5px;overflow:hidden;position:relative;min-width:90px;}
.rank-bar-fill{height:100%;background:linear-gradient(90deg,rgba(162,155,254,0.8),rgba(162,155,254,0.6));border-radius:5px;transition:width 1.5s ease;}
.rank-count{font-size:1rem;font-weight:600;color:var(--text-primary);margin-left:0.8rem;min-width:60px;text-align:right;flex-shrink:0;}
.chart-footer{margin-top:1.2rem;padding-top:0.8rem;border-top:1px solid rgba(255,255,255,0.1);display:flex;justify-content:flex-start;align-items:center;width:100%;}
.chart-legend{display:flex;align-items:center;gap:0.6rem;font-size:0.9rem;color:var(--text-secondary);}
.legend-color{width:14px;height:14px;border-radius:4px;}
.back-wrap{text-align:center;margin:var(--gap-l) 0;}
.back-btn{display:inline-flex;align-items:center;gap:0.5rem;composes:glass;color:var(--text-primary);padding:0.75rem 1.5rem;border-radius:var(--radius-s);text-decoration:none;transition:transform 0.2s ease,background 0.2s ease,border-color 0.2s ease;will-change:transform;}
.back-btn:hover{background:var(--primary-color);border-color:var(--primary-color);transform:translateY(-2px);}
.no-data{display:flex;align-items:center;justify-content:center;height:100%;color:var(--text-secondary);font-style:italic;font-size:0.95rem;padding:1.5rem;text-align:center;}
.rank-tip{margin-top:0.8rem;padding-top:0.8rem;border-top:1px solid rgba(255,255,255,0.1);text-align:center;color:var(--text-secondary);font-size:0.85rem;}
.rank-tip i{margin-right:0.5rem;}
@media (max-width:768px){.about-wrap{max-width:95%;padding:1.5rem;margin:5vh auto 0;}
.intro-section{padding:1.5rem 1.2rem;}
.intro-grid{grid-template-columns:repeat(2,1fr);gap:0.8rem;}
.intro-item{padding:1rem 0.5rem;min-height:90px;}
.chart-card{height:340px;padding:1.5rem 1.2rem;}
.rank-item{padding:0.7rem 0.6rem;gap:0.7rem;}
.rank-name{font-size:0.9rem;}
.rank-count{min-width:50px;font-size:0.9rem;}
.rank-number{width:28px;height:28px;font-size:0.9rem;}
.rank-bar{height:8px;min-width:70px;}
}
@media (max-width:480px){.intro-grid{grid-template-columns:1fr;gap:0.8rem;}
.intro-item{min-height:85px;}
}