/* ── Reset & base ─────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #0f1117;
  --surface: #1a1d27;
  --surface2: #22263a;
  --border: #2d3148;
  --text: #e8eaf6;
  --text-muted: #8b92b8;
  --accent: #6c8ff8;
  --accent2: #a78bfa;
  --green: #34d399;
  --yellow: #fbbf24;
  --red: #f87171;
  --orange: #fb923c;
  --radius: 12px;
  --shadow: 0 4px 24px rgba(0,0,0,.45);
  --font: 'Inter', system-ui, -apple-system, sans-serif;
}

html { font-size: 15px; scroll-behavior: smooth; }
body { background: var(--bg); color: var(--text); font-family: var(--font); line-height: 1.6; min-height: 100vh; }

/* ── Layout ───────────────────────────────────────────────────────────────── */
.container { max-width: 1200px; margin: 0 auto; padding: 0 1.5rem; }

header { padding: 2rem 0 1.5rem; border-bottom: 1px solid var(--border); margin-bottom: 2rem; }
header h1 { font-size: 1.6rem; font-weight: 700; letter-spacing: -.02em; }
header h1 span { color: var(--accent); }
.header-meta { color: var(--text-muted); font-size: .85rem; margin-top: .25rem; }

.tabs { display: flex; gap: .5rem; flex-wrap: wrap; margin-bottom: 2rem; }
.tab-btn {
  padding: .45rem 1rem; border-radius: 8px; border: 1px solid var(--border);
  background: var(--surface); color: var(--text-muted); cursor: pointer;
  font-size: .85rem; font-weight: 500; transition: all .15s;
}
.tab-btn:hover { border-color: var(--accent); color: var(--text); }
.tab-btn.active { background: var(--accent); border-color: var(--accent); color: #fff; }

.tab-pane { display: none; }
.tab-pane.active { display: block; }

/* ── KPI cards ────────────────────────────────────────────────────────────── */
.kpi-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 1rem;
  margin-bottom: 2rem;
}
.kpi {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1rem 1.25rem;
  box-shadow: var(--shadow);
}
.kpi-label { font-size: .72rem; text-transform: uppercase; letter-spacing: .07em; color: var(--text-muted); margin-bottom: .25rem; }
.kpi-value { font-size: 1.9rem; font-weight: 700; line-height: 1; }
.kpi-sub { font-size: .78rem; color: var(--text-muted); margin-top: .3rem; }
.kpi-badge {
  display: inline-block; font-size: .68rem; font-weight: 600;
  padding: .1rem .55rem; border-radius: 99px; margin-top: .4rem;
  text-transform: capitalize;
}

/* badge colour by classification */
.badge-excellent, .badge-elite, .badge-good, .badge-optimal, .badge-safe, .badge-normal, .badge-athletic {
  background: rgba(52,211,153,.15); color: var(--green); border: 1px solid rgba(52,211,153,.3);
}
.badge-average, .badge-moderate, .badge-fair {
  background: rgba(251,191,36,.15); color: var(--yellow); border: 1px solid rgba(251,191,36,.3);
}
.badge-below_average, .badge-poor, .badge-low, .badge-elevated, .badge-slow, .badge-high, .badge-short {
  background: rgba(248,113,113,.15); color: var(--red); border: 1px solid rgba(248,113,113,.3);
}
.badge-dangerous {
  background: rgba(248,113,113,.25); color: var(--red); border: 1px solid var(--red);
}

/* ── Chart cards ──────────────────────────────────────────────────────────── */
.chart-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(480px, 1fr));
  gap: 1.25rem;
  margin-bottom: 2rem;
}
@media (max-width: 540px) { .chart-grid { grid-template-columns: 1fr; } }

.card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.25rem 1.5rem;
  box-shadow: var(--shadow);
}
.card h3 { font-size: .9rem; font-weight: 600; margin-bottom: 1rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: .06em; }

.chart-wrap { position: relative; height: 220px; }

/* ── Trend indicator ──────────────────────────────────────────────────────── */
.trend { font-size: .75rem; display: inline-flex; align-items: center; gap: .25rem; margin-left: .5rem; }
.trend-up   { color: var(--green); }
.trend-down { color: var(--red); }
.trend-flat { color: var(--text-muted); }

/* ── Progress rings ───────────────────────────────────────────────────────── */
.ring-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; }
.ring-item { text-align: center; }
.ring-item svg { width: 80px; height: 80px; }
.ring-label { font-size: .72rem; color: var(--text-muted); margin-top: .25rem; text-transform: uppercase; letter-spacing: .05em; }
.ring-val { font-size: .9rem; font-weight: 700; }

/* ── Table ────────────────────────────────────────────────────────────────── */
.data-table { width: 100%; border-collapse: collapse; font-size: .85rem; }
.data-table th { text-align: left; padding: .5rem .75rem; color: var(--text-muted); font-weight: 500; border-bottom: 1px solid var(--border); }
.data-table td { padding: .5rem .75rem; border-bottom: 1px solid var(--border); }
.data-table tr:last-child td { border-bottom: none; }
.data-table tr:hover td { background: var(--surface2); }

/* ── Footer ───────────────────────────────────────────────────────────────── */
footer { border-top: 1px solid var(--border); padding: 1.5rem 0; color: var(--text-muted); font-size: .78rem; margin-top: 3rem; }
footer a { color: var(--accent); text-decoration: none; }

/* ── Scrollbar ────────────────────────────────────────────────────────────── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }