/* ══════════════════════════════════════════════════════
   Funding Rate Arb — Design System v2
   Sources: Tremor, shadcn/ui, Copin.io, dYdX, gTrade
   ══════════════════════════════════════════════════════ */

:root {
  /* ── Backgrounds (layered surfaces) ─── */
  --bg:       #0a0a0c;
  --bg-1:     #111114;
  --bg-2:     #19191d;
  --bg-3:     #222228;
  --bg-hover: #2a2a32;
  /* ── Text hierarchy ────────────────── */
  --text:     #e6e6e4;
  --text-2:   #94a3b8;
  --text-3:   #64748b;
  --text-4:   #475569;
  /* ── Borders ───────────────────────── */
  --border:   rgba(255,255,255,0.06);
  --border-2: rgba(255,255,255,0.10);
  --border-3: rgba(255,255,255,0.15);
  /* ── Semantic: Positive / Negative ─── */
  --green:    #22c55e;
  --green-m:  #4ade80;
  --green-bg: rgba(34,197,94,0.10);
  --green-bg2:rgba(34,197,94,0.20);
  --red:      #ef4444;
  --red-m:    #f87171;
  --red-bg:   rgba(239,68,68,0.10);
  --red-bg2:  rgba(239,68,68,0.20);
  /* ── Accents ───────────────────────── */
  --blue:     #3b82f6;
  --blue-m:   #60a5fa;
  --blue-bg:  rgba(59,130,246,0.10);
  --yellow:   #f59e0b;
  --yellow-m: #fbbf24;
  --yellow-bg:rgba(245,158,11,0.10);
  --orange:   #f97316;
  --orange-bg:rgba(249,115,22,0.10);
  --purple:   #a855f7;
  --purple-bg:rgba(168,85,247,0.10);
  --cyan:     #06b6d4;
  --cyan-bg:  rgba(6,182,212,0.10);
  /* ── Shadows ───────────────────────── */
  --shadow-sm:  0 1px 2px rgba(0,0,0,0.3);
  --shadow-md:  0 4px 8px -1px rgba(0,0,0,0.4);
  --shadow-lg:  0 12px 24px -4px rgba(0,0,0,0.5);
  --shadow-glow-g: 0 0 20px rgba(34,197,94,0.12);
  --shadow-glow-r: 0 0 20px rgba(239,68,68,0.12);
  --shadow-glow-b: 0 0 20px rgba(59,130,246,0.12);
  /* ── Layout ────────────────────────── */
  --radius:    8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --sidebar-w: 200px;
  /* ── Typography ────────────────────── */
  --mono: 'JetBrains Mono','SF Mono','Cascadia Code',monospace;
  --sans: 'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;
}

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

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-feature-settings: 'tnum' 1,'cv01' 1;
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  display: flex;
  min-height: 100vh;
}

/* ── Scrollbar ────────────────────────── */
::-webkit-scrollbar { width: 5px; height: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--bg-3); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-4); }

/* ══════════════════════════════════════════
   SIDEBAR (Copin/Linear-style)
   ══════════════════════════════════════════ */
.sidebar {
  width: var(--sidebar-w);
  min-height: 100vh;
  background: var(--bg-1);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0; left: 0;
  z-index: 200;
  transition: transform 0.2s ease;
}
.sidebar-brand {
  padding: 14px 16px;
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.3px;
  border-bottom: 1px solid var(--border);
}
.sidebar-brand svg { color: var(--blue); flex-shrink: 0; }
.sidebar-nav { padding: 8px; flex: 1; display: flex; flex-direction: column; gap: 2px; }
.sidebar-link {
  display: flex; align-items: center; gap: 10px;
  padding: 8px 10px; border-radius: 6px;
  font-size: 13px; font-weight: 500;
  color: var(--text-3); text-decoration: none;
  transition: all 0.12s;
}
.sidebar-link:hover { background: var(--bg-2); color: var(--text-2); }
.sidebar-link.active { background: var(--bg-3); color: var(--text); }
.sidebar-link svg { flex-shrink: 0; opacity: 0.5; }
.sidebar-link.active svg { opacity: 1; }
.sidebar-footer {
  padding: 12px 14px;
  border-top: 1px solid var(--border);
  display: flex; flex-direction: column; gap: 8px;
}

/* ── Connection indicator ─────────────── */
.conn-status { display: flex; align-items: center; gap: 6px; font-size: 11px; color: var(--text-3); }
.conn-dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--text-4); transition: all 0.3s;
}
.conn-dot.live { background: var(--green); box-shadow: 0 0 8px rgba(34,197,94,0.4); animation: pulse 2s ease-in-out infinite; }
.conn-dot.stale { background: var(--yellow); box-shadow: 0 0 6px rgba(245,158,11,0.3); }
.conn-dot.dead { background: var(--red); box-shadow: 0 0 6px rgba(239,68,68,0.3); }
@keyframes pulse { 0%,100%{opacity:1} 50%{opacity:0.4} }

/* ══════════════════════════════════════════
   MAIN AREA
   ══════════════════════════════════════════ */
.main-wrap {
  flex: 1; margin-left: var(--sidebar-w);
  display: flex; flex-direction: column; min-height: 100vh;
}
.topbar {
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  padding: 0 20px; height: 44px;
  display: flex; align-items: center; justify-content: flex-end;
  position: sticky; top: 0; z-index: 100;
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
}
.topbar-right { display: flex; align-items: center; gap: 12px; font-size: 11px; color: var(--text-3); }
.sidebar-toggle {
  display: none; background: none; border: none;
  color: var(--text-2); cursor: pointer; padding: 4px; margin-right: auto;
}
.page-content { padding: 16px 20px 48px; max-width: 1440px; width: 100%; margin: 0 auto; }

/* ══════════════════════════════════════════
   KPI ROW (gTrade/Copin style)
   ══════════════════════════════════════════ */
.kpi-row {
  display: flex; align-items: stretch;
  background: var(--bg-1);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  margin-bottom: 14px;
  overflow-x: auto;
}
.kpi {
  flex: 1; padding: 14px 20px; min-width: 150px;
  position: relative;
}
.kpi + .kpi::before {
  content: ''; position: absolute; left: 0; top: 12px; bottom: 12px;
  width: 1px; background: var(--border);
}
.kpi-label {
  font-size: 11px; color: var(--text-3); text-transform: uppercase;
  letter-spacing: 0.5px; font-weight: 500; margin-bottom: 3px;
}
.kpi-value {
  font-size: 22px; font-weight: 700; font-family: var(--mono);
  letter-spacing: -0.5px; line-height: 1.2;
}
.kpi-sub { font-size: 11px; color: var(--text-3); margin-top: 2px; }
.kpi-sparkline {
  position: absolute; bottom: 8px; right: 12px;
  opacity: 0.7; pointer-events: none;
}

/* ══════════════════════════════════════════
   CARDS (Tremor-style with top accent)
   ══════════════════════════════════════════ */
.cards {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px; margin-bottom: 14px;
}
.card {
  background: var(--bg-1);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 14px 16px;
  position: relative; overflow: hidden;
  transition: all 0.2s;
}
.card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0;
  height: 2px; background: var(--blue); opacity: 0;
  transition: opacity 0.2s;
}
.card:hover { border-color: var(--border-2); box-shadow: var(--shadow-md); }
.card:hover::before { opacity: 1; }
.card-label {
  font-size: 11px; color: var(--text-3); text-transform: uppercase;
  letter-spacing: 0.5px; font-weight: 500; margin-bottom: 4px;
}
.card-value {
  font-size: 24px; font-weight: 700; font-family: var(--mono);
  letter-spacing: -0.5px; line-height: 1.2;
}
.card-sub { font-size: 11px; color: var(--text-3); margin-top: 2px; }
.card-sparkline {
  position: absolute; bottom: 0; right: 0;
  opacity: 0.6; pointer-events: none;
}

/* ── Status badges ────────────────────── */
.badge {
  display: inline-flex; align-items: center; gap: 5px;
  padding: 3px 8px; border-radius: 20px;
  font-size: 10px; font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.6px;
}
.badge-live   { background: var(--green-bg); color: var(--green-m); border: 1px solid rgba(34,197,94,0.15); }
.badge-paper  { background: var(--yellow-bg); color: var(--yellow-m); border: 1px solid rgba(245,158,11,0.15); }
.badge-offline{ background: var(--red-bg); color: var(--red-m); border: 1px solid rgba(239,68,68,0.15); }

/* ══════════════════════════════════════════
   PANELS & TABLES (dYdX/Hyperliquid)
   ══════════════════════════════════════════ */
.panel {
  background: var(--bg-1);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  margin-bottom: 12px; overflow: hidden;
}
.panel-header {
  padding: 10px 16px;
  border-bottom: 1px solid var(--border);
  display: flex; align-items: center; justify-content: space-between;
}
.panel-title { font-size: 13px; font-weight: 600; letter-spacing: -0.2px; }
.panel-note { font-size: 11px; color: var(--text-4); }
.panel-body { padding: 0; }

table { width: 100%; border-collapse: separate; border-spacing: 0; font-size: 12px; }
th {
  text-align: left; padding: 8px 12px;
  font-size: 10px; font-weight: 600; color: var(--text-4);
  text-transform: uppercase; letter-spacing: 0.5px;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
  position: sticky; top: 0; z-index: 1;
  background: var(--bg-2);
  backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
}
td {
  padding: 7px 12px; white-space: nowrap;
  font-family: var(--mono); font-size: 12px;
  transition: background 100ms ease;
  vertical-align: middle;
}
tr:not(:last-child) td { border-bottom: 1px solid rgba(255,255,255,0.03); }
tr:hover td { background: var(--bg-hover); }

.pnl-cell-pos { background: rgba(34,197,94,0.04); }
.pnl-cell-neg { background: rgba(239,68,68,0.04); }

/* ── Exchange labels (brand colors) ──── */
.exch {
  display: inline-block; padding: 2px 7px; border-radius: 4px;
  font-size: 10px; font-weight: 600; font-family: var(--sans); letter-spacing: 0.3px;
}
.exch-lighter     { background: rgba(255,255,255,0.08); color: #d4d4d8; }           /* monochrome/dark */
.exch-hyperliquid { background: rgba(34,211,176,0.10);  color: #5eead4; }           /* cyan-green */
.exch-drift       { background: rgba(236,72,153,0.12);  color: #f472b6; }           /* pink */
.exch-bitget      { background: rgba(56,152,236,0.12);  color: #5bade8; }           /* blue */
.exch-bybit       { background: rgba(234,179,8,0.12);   color: #facc15; }           /* yellow */
.exch-phemex      { background: rgba(110,96,245,0.12);  color: #a5b4fc; }           /* indigo */
.exch-kraken      { background: rgba(134,90,226,0.12);  color: #a78bfa; }           /* purple */

/* ── Grid layouts ─────────────────────── */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.grid-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 12px; }

/* ── Buttons (gTrade-style) ───────────── */
.btn {
  padding: 5px 12px; border-radius: 6px; font-size: 11px; font-weight: 600;
  border: 1px solid var(--border-2); cursor: pointer;
  background: var(--bg-2); color: var(--text-2);
  transition: all 0.15s; font-family: var(--sans);
}
.btn:hover { background: var(--bg-3); color: var(--text); }
.btn:active { transform: scale(0.97); }
.btn-green { border-color: rgba(34,197,94,0.2); color: var(--green); }
.btn-green:hover { background: var(--green-bg); }
.btn-red { border-color: rgba(239,68,68,0.2); color: var(--red); }
.btn-red:hover { background: var(--red-bg); }

/* ── Color utilities ──────────────────── */
.text-green { color: var(--green-m); }
.text-red   { color: var(--red-m); }
.text-blue  { color: var(--blue-m); }
.text-yellow{ color: var(--yellow-m); }
.text-orange{ color: var(--orange); }
.text-purple{ color: var(--purple); }
.text-cyan  { color: var(--cyan); }
.text-dim   { color: var(--text-3); }
.text-right { text-align: right; }
.text-center{ text-align: center; }
.val-green { color: var(--green-m); }
.val-red   { color: var(--red-m); }

/* P&L glow for hero values */
.pnl-glow-pos { color: var(--green); text-shadow: 0 0 12px rgba(34,197,94,0.25); }
.pnl-glow-neg { color: var(--red); text-shadow: 0 0 12px rgba(239,68,68,0.25); }

.empty { padding: 24px; text-align: center; color: var(--text-4); font-size: 12px; }

/* ── Flash animations ─────────────────── */
@keyframes flash-green { 0%{background:var(--green-bg2)} 100%{background:transparent} }
@keyframes flash-red { 0%{background:var(--red-bg2)} 100%{background:transparent} }
.flash-green { animation: flash-green 0.8s ease-out; }
.flash-red   { animation: flash-red 0.8s ease-out; }

/* ── Stagger entry animation ──────────── */
@keyframes fadeUp { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }
.fade-up { animation: fadeUp 0.3s ease-out both; }
.fade-up:nth-child(1) { animation-delay: 0ms; }
.fade-up:nth-child(2) { animation-delay: 50ms; }
.fade-up:nth-child(3) { animation-delay: 100ms; }
.fade-up:nth-child(4) { animation-delay: 150ms; }

/* ══════════════════════════════════════════
   RESPONSIVE
   ══════════════════════════════════════════ */
@media (max-width: 1024px) {
  .cards { grid-template-columns: repeat(2, 1fr); }
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
  .kpi-row { flex-wrap: wrap; }
  .kpi { min-width: calc(50% - 1px); }
}
@media (max-width: 768px) {
  .sidebar { transform: translateX(-100%); }
  .sidebar.open { transform: translateX(0); box-shadow: 4px 0 24px rgba(0,0,0,0.5); }
  .main-wrap { margin-left: 0; }
  .sidebar-toggle { display: block; }
  .cards { grid-template-columns: 1fr; }
  .kpi { min-width: 100%; }
  .kpi + .kpi::before { display: none; }
}
@media (max-width: 600px) {
  .page-content { padding: 12px 12px 32px; }
}