*{margin:0;padding:0;box-sizing:border-box}
:root{--bg:linear-gradient(135deg,#667eea 0%,#764ba2 100%);--card-bg:#fff;--card-title:#222;--text:#333;--muted:#888;--border:#eee}
html.dark{--card-bg:#1e1e2e;--card-title:#e0e0e0;--text:#ccc;--muted:#777;--border:#333}
body{font-family:'Segoe UI',Tahoma,Geneva,Verdana,sans-serif;background:var(--bg);min-height:100vh;padding:40px 20px 20px}
html.dark body{background:linear-gradient(135deg,#1a1a2e 0%,#16213e 100%)}
.container{max-width:1000px;margin:0 auto}
header{text-align:center;margin-bottom:40px}
header h1{font-size:36px;color:#fff;text-shadow:0 2px 10px rgba(0,0,0,.3);margin-bottom:8px}
header p{color:rgba(255,255,255,.8);font-size:16px}
.back-link{display:inline-block;color:#fff;text-decoration:none;font-size:14px;font-weight:600;padding:8px 20px;border-radius:30px;border:2px solid rgba(255,255,255,.6);margin-bottom:20px;transition:all .2s}
.back-link:hover{background:rgba(255,255,255,.2);border-color:#fff}

/* Stat cards */
.stat-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:16px;margin-bottom:40px}
.stat-card{background:var(--card-bg);border-radius:16px;padding:24px;text-align:center;box-shadow:0 4px 20px rgba(0,0,0,.15)}
.stat-value{font-size:36px;font-weight:800;color:#667eea;margin-bottom:4px}
html.dark .stat-value{color:#8b9cf7}
.stat-label{font-size:13px;color:var(--muted);text-transform:uppercase;letter-spacing:.5px;font-weight:600}

/* Sections */
.section{margin-bottom:40px}
.section h2{color:#fff;font-size:24px;margin-bottom:16px;text-shadow:0 2px 8px rgba(0,0,0,.3)}
.section-subtitle{color:rgba(255,255,255,.7);font-size:14px;margin-bottom:16px}

/* Achievements */
.ach-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:12px}
.ach-card{background:var(--card-bg);border-radius:12px;padding:16px;display:flex;align-items:center;gap:14px;box-shadow:0 4px 16px rgba(0,0,0,.1)}
.ach-card.locked{opacity:.4;filter:grayscale(1)}
.ach-icon{font-size:32px;flex-shrink:0;width:44px;text-align:center}
.ach-name{font-size:15px;font-weight:700;color:var(--card-title);margin-bottom:2px}
.ach-desc{font-size:12px;color:var(--muted)}
.ach-date{font-size:11px;color:#667eea;margin-top:2px}

/* Leaderboard / Personal Bests */
.lb-table{width:100%;background:var(--card-bg);border-radius:16px;overflow:hidden;box-shadow:0 4px 20px rgba(0,0,0,.15)}
.lb-table table{width:100%;border-collapse:collapse}
.lb-table th{background:#667eea;color:#fff;padding:12px 16px;text-align:left;font-size:13px;text-transform:uppercase;letter-spacing:.5px}
html.dark .lb-table th{background:#3d4f9f}
.lb-table td{padding:12px 16px;border-bottom:1px solid var(--border);color:var(--text);font-size:14px}
.lb-table tr:last-child td{border-bottom:none}
.lb-table tr:hover td{background:rgba(102,126,234,.05)}
.lb-rank{font-weight:800;color:#667eea;width:40px}
.lb-time{font-weight:700;font-variant-numeric:tabular-nums}
.lb-badge{display:inline-block;padding:2px 8px;border-radius:10px;font-size:11px;font-weight:600;color:#fff}
.lb-badge.Easy{background:#4CAF50}.lb-badge.Medium{background:#FF9800}.lb-badge.Hard{background:#f44336}.lb-badge.Expert{background:#9C27B0}.lb-badge.Master{background:linear-gradient(135deg,#1a1a2e,#e94560);color:#FFD700}

/* Recent grid */
.recent-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:16px}
.recent-card{background:var(--card-bg);border-radius:12px;overflow:hidden;box-shadow:0 4px 16px rgba(0,0,0,.15);text-decoration:none;color:inherit;display:flex;transition:transform .2s}
.recent-card:hover{transform:translateY(-3px)}
.recent-img{width:100px;height:80px;object-fit:cover;flex-shrink:0}
.recent-info{padding:12px;flex:1;min-width:0}
.recent-title{font-size:14px;font-weight:700;color:var(--card-title);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.recent-meta{font-size:12px;color:var(--muted);margin-top:4px}

/* Empty state */
.empty{text-align:center;padding:40px;color:rgba(255,255,255,.7)}
.empty .icon{font-size:48px;margin-bottom:12px}

/* Tabs */
.tabs{display:flex;gap:8px;margin-bottom:20px;flex-wrap:wrap}
.tab-btn{padding:8px 20px;border-radius:30px;border:2px solid rgba(255,255,255,.6);background:transparent;color:#fff;font-size:14px;font-weight:600;cursor:pointer;transition:all .2s}
.tab-btn:hover{background:rgba(255,255,255,.2)}
.tab-btn.active{background:#fff;color:#764ba2;border-color:#fff}
html.dark .tab-btn.active{background:#667eea;color:#fff;border-color:#667eea}

.tab-content{display:none}
.tab-content.active{display:block}

/* Difficulty filter for leaderboard */
.diff-pills{display:flex;gap:6px;margin-bottom:16px;flex-wrap:wrap}
.diff-pill{padding:6px 14px;border-radius:20px;font-size:12px;font-weight:600;cursor:pointer;border:none;color:#fff;opacity:.6;transition:all .2s}
.diff-pill:hover,.diff-pill.active{opacity:1;transform:scale(1.05)}
.diff-pill[data-diff="All"]{background:#667eea}
.diff-pill[data-diff="Easy"]{background:#4CAF50}
.diff-pill[data-diff="Medium"]{background:#FF9800}
.diff-pill[data-diff="Hard"]{background:#f44336}
.diff-pill[data-diff="Expert"]{background:#9C27B0}
.diff-pill[data-diff="Master"]{background:linear-gradient(135deg,#1a1a2e,#e94560);color:#FFD700}

@media(max-width:600px){
    header h1{font-size:28px}
    .stat-grid{grid-template-columns:repeat(2,1fr)}
    .recent-grid{grid-template-columns:1fr}
}

/* Utility classes (CSP-safe replacements for inline styles) */
.initially-hidden{display:none}
.ach-share-btn{margin-left:auto;background:none;border:1px solid var(--border);border-radius:6px;color:var(--muted);font-size:14px;padding:4px 8px;cursor:pointer;flex-shrink:0;width:auto}
.ach-inner{flex:1}
.lb-link{color:var(--card-title);text-decoration:none;font-weight:600}
.lb-artist{color:var(--muted)}
.stat-extra{margin-top:8px;font-size:12px;color:var(--muted)}
.gallery-link{color:#fff}