:root {
  --bg: #050505;
  --panel: rgba(20, 20, 25, 0.6);
  --accent: #00ff9d;
  --accent-2: #00b8ff;
  --accent-glow: rgba(0, 255, 157, 0.4);
  --text-main: #ffffff;
  --text-muted: #8b9bb4;
  --glass-border: rgba(255, 255, 255, 0.08);
  --glass-highlight: rgba(255, 255, 255, 0.05);
  --card-bg: rgba(255, 255, 255, 0.03);
  --font-heading: 'Orbitron', sans-serif;
  --font-body: 'Outfit', sans-serif;
  --font-mono: 'Fira Code', monospace;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; overflow-x: hidden; }

body {
  font-family: var(--font-body);
  background-color: var(--bg);
  color: var(--text-main);
  -webkit-font-smoothing: antialiased;
  padding: clamp(20px, 4vw, 40px) clamp(12px, 3vw, 24px);
  position: relative;
}

/* Ambient Background */
.bg-ambient {
  position: fixed;
  top: 0; left: 0; width: 100%; height: 100%;
  z-index: -1;
  background: 
    radial-gradient(circle at 15% 50%, rgba(0, 255, 157, 0.08), transparent 25%),
    radial-gradient(circle at 85% 30%, rgba(0, 184, 255, 0.08), transparent 25%);
  pointer-events: none;
}

/* Layout */
.container { max-width: 1280px; margin: 0 auto; }

header {
  display: flex; justify-content: space-between; align-items: center;
  flex-wrap: wrap; gap: 24px; margin-bottom: 40px;
}

.back-btn {
  font-family: var(--font-heading);
  padding: 0.6rem 1.2rem;
  border-radius: 12px;
  background: rgba(0, 255, 157, 0.1);
  border: 1px solid var(--accent);
  color: var(--accent);
  font-weight: 700;
  text-decoration: none;
  transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
  text-transform: uppercase;
  font-size: 0.8rem;
  letter-spacing: 1px;
}
.back-btn:hover { 
  background: var(--accent); 
  color: #000; 
  box-shadow: 0 0 20px var(--accent-glow);
  transform: translateY(-2px);
}

.logo {
  width: clamp(64px, 10vw, 80px);
  height: clamp(64px, 10vw, 80px);
  border-radius: 20px;
  background: linear-gradient(135deg, rgba(255,255,255,0.1), rgba(255,255,255,0.02));
  border: 1px solid var(--glass-border);
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-heading); font-weight: 900;
  color: var(--accent); font-size: clamp(16px, 2.5vw, 20px);
  box-shadow: 0 8px 32px rgba(0,0,0,0.3);
  position: relative;
  overflow: hidden;
}
.logo::after {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(135deg, transparent, rgba(255,255,255,0.2), transparent);
  transform: translateX(-100%);
  transition: 0.5s;
}
.logo:hover::after { transform: translateX(100%); }

h1 {
  font-family: var(--font-heading); font-weight: 800;
  font-size: clamp(28px, 5vw, 42px);
  letter-spacing: -1px;
  background: linear-gradient(to right, #fff, #b0b0b0);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 4px;
}
.subtitle { 
  color: var(--text-muted); 
  font-size: clamp(14px, 2vw, 16px); 
  font-weight: 300;
  letter-spacing: 0.5px;
}

.grid {
  display: grid;
  grid-template-columns: 1fr 380px;
  gap: 32px;
}

/* Glass Panel */
.panel {
  background: var(--panel);
  border: 1px solid var(--glass-border);
  padding: 24px;
  border-radius: 24px;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: 0 20px 40px rgba(0,0,0,0.4);
}

/* Leaderboard List */
.leaderboard-list { display: flex; flex-direction: column; gap: 12px; margin-top: 24px; }

.row {
  display: flex; align-items: center; gap: 16px;
  padding: 16px; border-radius: 16px;
  background: var(--card-bg);
  border: 1px solid transparent;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}
.row:hover {
  background: rgba(255, 255, 255, 0.06);
  border-color: var(--glass-border);
  transform: scale(1.01) translateX(4px);
  box-shadow: 0 10px 20px rgba(0,0,0,0.2);
}

.rank {
  width: 48px; height: 48px;
  display: grid; place-items: center;
  border-radius: 12px; font-weight: 700;
  font-family: var(--font-mono);
  background: rgba(255,255,255,0.05);
  color: var(--accent); font-size: 18px;
  border: 1px solid var(--glass-border);
}

.meta { flex: 1; display: flex; flex-direction: column; gap: 2px; }
.name { 
  font-weight: 600; 
  font-size: 1.1rem; 
  color: var(--text-main);
  letter-spacing: 0.3px;
}
.details { 
  font-size: 0.85rem; 
  color: var(--text-muted); 
  font-weight: 300;
}

.stat { 
  min-width: 100px; 
  text-align: right; 
  font-weight: 700; 
  font-size: 1.2rem; 
  font-family: var(--font-mono);
  color: var(--accent-2);
  text-shadow: 0 0 10px rgba(0, 184, 255, 0.3);
}

/* Sidebar */
.sidebar { display: flex; flex-direction: column; gap: 24px; }

.sidebar .card {
  padding: 20px; border-radius: 20px;
  background: var(--panel);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(20px);
}

.category-list { display: flex; flex-direction: column; gap: 12px; }
.cat {
  display: flex; gap: 12px; align-items: center;
  padding: 12px 16px; border-radius: 12px;
  background: rgba(255,255,255,0.03);
  border: 1px solid transparent;
  cursor: pointer;
  transition: 0.2s;
}
.cat:hover {
  background: rgba(255,255,255,0.06);
  border-color: var(--glass-border);
}
.cat .cname { font-weight: 500; font-size: 0.95rem; }
.cat .ccount { 
  margin-left: auto; 
  color: var(--text-muted); 
  font-family: var(--font-mono);
  font-size: 0.8rem;
  background: rgba(0,0,0,0.3);
  padding: 2px 8px;
  border-radius: 6px;
}

/* Filters/Tabs */
.filters-wrapper { margin-bottom: 1.5rem; }

.tabs {
  display: flex; gap: 8px; flex-wrap: wrap;
  padding: 6px;
  background: rgba(0, 0, 0, 0.3);
  border: 1px solid var(--glass-border);
  border-radius: 16px;
}

.tab {
  flex: 1; text-align: center;
  font-weight: 600; font-size: 0.9rem;
  padding: 10px 16px;
  border-radius: 10px;
  cursor: pointer;
  transition: 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
  color: var(--text-muted);
  position: relative;
  overflow: hidden;
}

.tab:hover { color: var(--text-main); }

.tab.active {
  background: rgba(255, 255, 255, 0.1);
  color: var(--accent);
  box-shadow: 0 4px 12px rgba(0,0,0,0.2);
}
.tab.active::before {
  content: ''; position: absolute; bottom: 0; left: 0; width: 100%; height: 2px;
  background: var(--accent);
  box-shadow: 0 -2px 10px var(--accent);
}

/* Responsive */
@media (max-width: 1024px) {
  .grid { grid-template-columns: 1fr; }
  .sidebar { order: -1; }
}

@media (max-width: 768px) {
  .tabs { flex-direction: column; background: transparent; border: none; padding: 0; }
  .tab { background: var(--panel); border: 1px solid var(--glass-border); margin-bottom: 8px; }
  .tab.active { background: var(--accent); color: #000; }
  .tab.active::before { display: none; }
  
  .row { flex-direction: column; align-items: flex-start; }
  .stat { text-align: left; margin-top: 8px; font-size: 1rem; }
  .rank { width: 36px; height: 36px; font-size: 14px; }
}