:root {
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-card: #1a1a25;
    --bg-hover: #22222e;
    --border: rgba(255,255,255,0.06);
    --border-glow: rgba(0,240,255,0.15);
    --text-primary: #f0f0f0;
    --text-secondary: #8888a0;
    --text-muted: #55556a;
    --accent: #00f0ff;
    --accent2: #8b5cf6;
    --success: #00ff64;
    --warning: #ffaa00;
    --danger: #ff4444;
    --gradient: linear-gradient(135deg, #00f0ff, #8b5cf6);
    --font: 'Inter', -apple-system, sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body { background: var(--bg-primary); color: var(--text-primary); font-family: var(--font); line-height: 1.6; min-height: 100vh; }
a { color: var(--accent); text-decoration: none; transition: opacity 0.2s; }
a:hover { opacity: 0.8; }

/* Nav */
.navbar { background: rgba(18,18,26,0.95); backdrop-filter: blur(20px); border-bottom: 1px solid var(--border); position: sticky; top: 0; z-index: 1000; }
.nav-inner { max-width: 1200px; margin: 0 auto; padding: 0 24px; display: flex; align-items: center; justify-content: space-between; height: 64px; }
.nav-brand { font-size: 20px; font-weight: 700; background: var(--gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.nav-links { display: flex; gap: 8px; align-items: center; }
.nav-links a { padding: 8px 16px; border-radius: 8px; color: var(--text-secondary); font-size: 14px; font-weight: 500; transition: all 0.2s; }
.nav-links a:hover, .nav-links a.active { color: var(--accent); background: rgba(0,240,255,0.06); }
.nav-user { display: flex; align-items: center; gap: 12px; }
.cs-title { font-size: 18px; font-weight: 700; background: var(--gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; margin-left: auto; margin-right: 12px; white-space: nowrap; }
.nav-chars { font-size: 13px; color: var(--text-muted); }
.nav-chars span { color: var(--accent); font-weight: 600; }
.btn-nav { padding: 8px 20px; border-radius: 8px; font-size: 14px; font-weight: 600; border: none; cursor: pointer; transition: all 0.2s; }
.btn-nav.primary { background: var(--gradient); color: #000; }
.btn-nav.primary:hover { box-shadow: 0 4px 16px rgba(0,240,255,0.3); }
.btn-nav.ghost { background: transparent; color: var(--text-secondary); border: 1px solid var(--border); }
.btn-nav.ghost:hover { border-color: var(--accent); color: var(--accent); }

/* Layout */
.container { max-width: 1200px; margin: 0 auto; padding: 32px 24px; }

/* Cards */
.card { background: var(--bg-card); border: 1px solid var(--border); border-radius: 16px; padding: 24px; transition: all 0.3s; }
.card:hover { border-color: var(--border-glow); }
.card-glow { box-shadow: 0 0 40px rgba(0,240,255,0.05); }

/* Buttons */
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 12px 24px; border-radius: 10px; font-size: 14px; font-weight: 600; border: none; cursor: pointer; transition: all 0.2s; font-family: var(--font); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn-primary { background: var(--gradient); color: #000; }
.btn-primary:hover:not(:disabled) { box-shadow: 0 6px 20px rgba(0,240,255,0.3); transform: translateY(-1px); }
.btn-secondary { background: var(--bg-hover); color: var(--text-primary); border: 1px solid var(--border); }
.btn-secondary:hover { border-color: var(--accent); }
.btn-danger { background: rgba(255,68,68,0.15); color: var(--danger); border: 1px solid rgba(255,68,68,0.3); }
.btn-sm { padding: 8px 16px; font-size: 13px; }

/* Forms */
.form-group { margin-bottom: 20px; }
.form-label { display: block; font-size: 13px; font-weight: 500; color: var(--text-secondary); margin-bottom: 6px; }
.form-input { width: 100%; padding: 12px 16px; background: var(--bg-secondary); border: 1px solid var(--border); border-radius: 10px; color: var(--text-primary); font-size: 14px; font-family: var(--font); transition: all 0.2s; }
.form-input:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px rgba(0,240,255,0.1); }
.form-input::placeholder { color: var(--text-muted); }
textarea.form-input { resize: vertical; min-height: 100px; }

/* Alerts */
.alert { padding: 14px 18px; border-radius: 10px; margin-bottom: 20px; font-size: 14px; }
.alert-success { background: rgba(0,255,100,0.08); border: 1px solid rgba(0,255,100,0.2); color: var(--success); }
.alert-error { background: rgba(255,68,68,0.08); border: 1px solid rgba(255,68,68,0.2); color: var(--danger); }
.alert-warning { background: rgba(255,170,0,0.08); border: 1px solid rgba(255,170,0,0.2); color: var(--warning); }

/* Tables */
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; }
th, td { padding: 12px 16px; text-align: left; border-bottom: 1px solid var(--border); font-size: 14px; }
th { color: var(--text-muted); font-weight: 600; font-size: 12px; text-transform: uppercase; letter-spacing: 0.05em; }
tr:hover td { background: rgba(255,255,255,0.02); }

/* Badge */
.badge { display: inline-block; padding: 4px 10px; border-radius: 20px; font-size: 11px; font-weight: 600; }
.badge-success { background: rgba(0,255,100,0.12); color: var(--success); }
.badge-warning { background: rgba(255,170,0,0.12); color: var(--warning); }
.badge-danger { background: rgba(255,68,68,0.12); color: var(--danger); }
.badge-info { background: rgba(0,240,255,0.12); color: var(--accent); }

/* Stat card */
.stat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 16px; margin-bottom: 24px; }
.stat-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: 12px; padding: 20px; }
.stat-label { font-size: 12px; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: 4px; }
.stat-value { font-size: 28px; font-weight: 700; background: var(--gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }

/* Tabs */
.tabs { display: flex; gap: 4px; margin-bottom: 24px; border-bottom: 1px solid var(--border); padding-bottom: 4px; }
.tab { padding: 10px 20px; border-radius: 8px 8px 0 0; font-size: 14px; font-weight: 500; color: var(--text-secondary); cursor: pointer; border: none; background: transparent; font-family: var(--font); transition: all 0.2s; }
.tab:hover { color: var(--text-primary); }
.tab.active { color: var(--accent); background: rgba(0,240,255,0.06); border-bottom: 2px solid var(--accent); }

/* Responsive */
@media (max-width: 768px) {
    .nav-inner { flex-wrap: wrap; height: auto; padding: 12px 16px; gap: 8px; }
    .nav-links { display: none; }
    .nav-user { width: 100%; justify-content: flex-end; }
    .nav-chars { display: none; }
    .cs-title { font-size: 15px; margin-right: 0; }
    .container { padding: 20px 16px; }
    .stat-grid { grid-template-columns: repeat(2, 1fr); }
}

/* Animations */
@keyframes fadeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }
.fade-in { animation: fadeIn 0.3s ease-out; }
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.5; } }
.loading { animation: pulse 1.5s infinite; }

/* Glowing border effect */
.glow-border { position: relative; }
.glow-border::before { content: ''; position: absolute; inset: -1px; border-radius: inherit; background: var(--gradient); opacity: 0; transition: opacity 0.3s; z-index: -1; }
.glow-border:hover::before { opacity: 0.3; }

/* Sub Navigation */
.sub-nav { background: transparent; position: sticky; top: 64px; z-index: 99; padding: 12px 0 0; }
.sub-nav-inner { max-width: 1200px; margin: 0 auto; padding: 4px; display: flex; gap: 4px; align-items: center; justify-content: center; overflow-x: auto; -webkit-overflow-scrolling: touch; scrollbar-width: none; -ms-overflow-style: none; background: var(--bg-card); border: 1px solid var(--border); border-radius: 14px; }
.sub-nav-inner::-webkit-scrollbar { display: none; }
.sub-nav-item { flex: 1; text-align: center; padding: 10px 14px; font-size: 13px; font-weight: 500; color: var(--text-secondary); transition: all 0.2s; text-decoration: none; border-radius: 10px; white-space: nowrap; }
.sub-nav-item:hover { color: var(--text-primary); }
.sub-nav-item.active { color: #000; background: var(--gradient); font-weight: 600; }
.sub-nav-plans { flex: 1; background: linear-gradient(135deg, rgba(139,92,246,0.15), rgba(0,240,255,0.08)); color: var(--accent2) !important; font-weight: 700; border-radius: 8px; border-bottom: none; }
.sub-nav-plans:hover { background: linear-gradient(135deg, rgba(139,92,246,0.25), rgba(0,240,255,0.15)); color: var(--accent2) !important; }
.sub-nav-plans.active { background: linear-gradient(135deg, rgba(139,92,246,0.25), rgba(0,240,255,0.15)); color: var(--accent2) !important; border-bottom: none; box-shadow: 0 2px 8px rgba(139,92,246,0.2); }
.sub-nav-cs { flex: 1; background: rgba(0,240,255,0.08); color: var(--accent) !important; font-weight: 600; border-radius: 8px; border-bottom: none; }
.sub-nav-cs:hover { background: rgba(0,240,255,0.15); color: var(--accent) !important; }
.sub-nav-account { flex: 1; background: rgba(0,255,100,0.08); color: var(--success) !important; font-weight: 600; border-radius: 8px; border-bottom: none; }
.sub-nav-account:hover { background: rgba(0,255,100,0.15); }
.sub-nav-history { flex: 1; background: rgba(255,170,0,0.08); color: var(--warning) !important; font-weight: 600; border-radius: 8px; border-bottom: none; }
.sub-nav-history:hover { background: rgba(255,170,0,0.15); }
.sub-nav-logout { flex: 0; margin-left: auto; color: var(--text-muted) !important; font-size: 13px; }
.sub-nav-logout:hover { color: var(--danger) !important; }

@media (max-width: 768px) {
    .sub-nav-inner { padding: 4px; margin: 0 16px; overflow-x: auto; -webkit-overflow-scrolling: touch; }
    .sub-nav-item { padding: 8px 12px; font-size: 12px; white-space: nowrap; }
}