frontend/src/index.css

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&family=Noto+Sans+SC:wght@400;500;700&family=JetBrains+Mono:wght@400;500;600&display=swap');

:root {
  --bg: #060b18;
  --surface: #0d1525;
  --card: rgba(22,33,55,.65);
  --card-solid: #162137;
  --border: rgba(56,80,130,.35);
  --border-hover: rgba(59,130,246,.4);
  --text: #e8ecf4;
  --muted: #7b8ba8;
  --accent: #4f8ff7;
  --accent-glow: rgba(79,143,247,.12);
  --accent-bright: #6da3ff;
  --green: #22c55e;
  --green-glow: rgba(34,197,94,.12);
  --yellow: #eab308;
  --yellow-glow: rgba(234,179,8,.1);
  --red: #f43f5e;
  --red-glow: rgba(244,63,94,.1);
  --orange: #f97316;
  --purple: #a855f7;
  --purple-glow: rgba(168,85,247,.12);
  --cyan: #06b6d4;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0,0,0,.3), 0 1px 2px rgba(0,0,0,.2);
  --shadow-md: 0 4px 14px rgba(0,0,0,.35), 0 2px 6px rgba(0,0,0,.2);
  --shadow-lg: 0 8px 30px rgba(0,0,0,.4), 0 4px 12px rgba(0,0,0,.25);
  --shadow-glow: 0 0 20px rgba(79,143,247,.08), 0 4px 14px rgba(0,0,0,.3);

  /* Blur */
  --blur: blur(12px);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Inter', 'Noto Sans SC', system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  background-image:
    radial-gradient(ellipse 80% 60% at 50% 0%, rgba(79,143,247,.04) 0%, transparent 60%),
    radial-gradient(ellipse 60% 50% at 80% 100%, rgba(168,85,247,.03) 0%, transparent 50%);
  background-attachment: fixed;
}

/* ── Scrollbar ── */
::-webkit-scrollbar { width: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, rgba(79,143,247,.3), rgba(168,85,247,.2));
  border-radius: 10px;
}
::-webkit-scrollbar-thumb:hover { background: rgba(79,143,247,.5); }

/* ── Recharts tooltip ── */
.recharts-default-tooltip {
  background: var(--card-solid) !important;
  border: 1px solid var(--border) !important;
  border-radius: 10px !important;
  box-shadow: var(--shadow-md) !important;
  backdrop-filter: var(--blur) !important;
}

/* ── Selection ── */
::selection {
  background: rgba(79,143,247,.28);
  color: var(--text);
}

/* ── Stat Card (reusable) ── */
.stat-card {
  background: var(--card);
  backdrop-filter: var(--blur);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 18px 20px;
  transition: all .3s cubic-bezier(.4,0,.2,1);
  position: relative;
  overflow: hidden;
}
.stat-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(79,143,247,.04) 0%, transparent 60%);
  opacity: 0;
  transition: opacity .3s;
}
.stat-card:hover {
  border-color: var(--border-hover);
  box-shadow: var(--shadow-glow);
  transform: translateY(-1px);
}
.stat-card:hover::before { opacity: 1; }
.stat-label {
  font-size: .7rem;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--muted);
  font-weight: 600;
}
.stat-value {
  font-size: 1.6rem;
  font-weight: 800;
  margin: 6px 0 4px;
  background: linear-gradient(135deg, var(--text) 30%, var(--accent-bright));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.stat-sub {
  font-size: .7rem;
  color: var(--muted);
}

/* ── Monospace for code/numbers ── */
code, .mono {
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
}