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

:root,
[data-theme="light"] {
  --bg: #f4f1ec;
  --bg-panel: rgba(255, 253, 250, 0.72);
  --nav-bg: rgba(244, 241, 236, 0.6);
  --ink: #1a1d22;
  --ink-muted: #595f68;
  --ink-dim: #9299a2;
  --accent: #2c5a7a;
  --border: rgba(26, 29, 34, 0.1);
  --danger: #a03030;
  --danger-soft: rgba(160, 48, 48, 0.08);
  --danger-text: #a03030;
  --input-bg: rgba(26, 29, 34, 0.04);
  --surface-hover: rgba(26, 29, 34, 0.04);
}

[data-theme="tokyo"] {
  --bg: #07070d;
  --bg-panel: rgba(20, 22, 35, 0.85);
  --nav-bg: rgba(7, 7, 13, 0.65);
  --ink: #e8f4ff;
  --ink-muted: #a3b3cc;
  --ink-dim: #7886a0;
  --accent: #64dcff;
  --border: rgba(100, 220, 255, 0.25);
  --danger: #d93d3d;
  --danger-soft: rgba(217, 61, 61, 0.16);
  --danger-text: #ffd1d1;
  --input-bg: rgba(100, 220, 255, 0.08);
  --surface-hover: rgba(100, 220, 255, 0.1);
}

html { scroll-behavior: smooth; }

body {
  min-height: 100vh;
  min-height: 100dvh;
  background: var(--bg);
  color: var(--ink);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.92rem;
  font-weight: 300;
  line-height: 1.65;
  display: flex;
  flex-direction: column;
  transition: background 0.3s ease, color 0.3s ease;
}

a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: all 0.2s ease;
}
a:hover { border-bottom-color: var(--accent); }

/* ---- Nav ---- */
nav {
  position: fixed; top: 0; left: 0;
  width: 100%; z-index: 20;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 1rem;
  padding: 1.25rem 2.5rem;
  background: var(--nav-bg);
  backdrop-filter: blur(12px) saturate(120%);
  -webkit-backdrop-filter: blur(12px) saturate(120%);
  border-bottom: 1px solid var(--border);
  transition: background 0.3s ease;
}

.back-link {
  grid-column: 1;
  justify-self: start;
  font-family: 'JetBrains Mono', monospace;
  font-weight: 400;
  font-size: 0.7rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  white-space: nowrap;
  color: var(--ink-muted);
  text-decoration: none;
  padding: 0.35rem 0.6rem;
  border: 1px solid var(--border);
  border-radius: 2px;
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}
.back-link:hover {
  color: var(--ink);
  border-color: var(--ink-muted);
  background: var(--bg-panel);
  border-bottom-color: var(--ink-muted);
}

.nav-brand {
  grid-column: 2;
  justify-self: center;
  display: inline-flex;
  align-items: baseline;
  gap: 0.35rem;
  white-space: nowrap;
  font-family: 'JetBrains Mono', monospace;
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: -0.02em;
  color: var(--ink);
  text-decoration: none;
}
.nav-brand:hover { color: var(--accent); border-bottom: none; }

.brand-sep { font-weight: 300; color: var(--ink-dim); }
.brand-sub {
  font-weight: 400;
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-muted);
  align-self: center;
  padding-top: 2px;
}

[data-theme="tokyo"] .nav-brand {
  color: #e8f4ff;
  text-shadow: 0 0 8px rgba(100, 220, 255, 0.3);
}

/* ---- Main ---- */
.page-body {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: calc(65px + 2.5rem) 2rem 4rem;
}

.dashboard {
  width: min(1200px, 100%);
  background: var(--bg-panel);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 2rem;
  box-shadow: 0 8px 30px rgba(26, 29, 34, 0.06);
  animation: panel-in 0.7s cubic-bezier(0.16, 1, 0.3, 1) forwards;
  opacity: 0;
  transform: translateY(10px);
  transition: background 0.3s ease, border-color 0.3s ease;
  position: relative;
  min-height: 500px;
}

@keyframes panel-in {
  0%   { opacity: 0; transform: translateY(10px); }
  100% { opacity: 1; transform: translateY(0); }
}

/* ---- Loading Overlay ---- */
.loading-overlay {
  position: absolute;
  inset: 0;
  background: var(--bg-panel);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10;
  border-radius: 3px;
  color: var(--ink-muted);
  font-size: 0.88rem;
  letter-spacing: 0.05em;
}

.loading-overlay.hidden {
  display: none;
}

/* ---- Empty State ---- */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 3rem 1rem;
  color: var(--ink-dim);
  font-size: 0.85rem;
  text-align: center;
  line-height: 1.6;
}

/* ---- Filters ---- */
.filters {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 1rem;
  margin-bottom: 2rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border);
}

.filter-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.filter-group label {
  font-size: 0.65rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--ink-dim);
}

.filter-group select {
  padding: 0.5rem 0.75rem;
  background: var(--input-bg);
  border: 1px solid var(--border);
  border-radius: 2px;
  color: var(--ink);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.82rem;
  outline: none;
  transition: border-color 0.2s;
  cursor: pointer;
}
.filter-group select:focus { border-color: var(--accent); }

.apply-btn {
  align-self: flex-end;
  padding: 0.5rem 1.2rem;
  background: var(--accent);
  color: var(--bg);
  border: none;
  border-radius: 2px;
  font-family: 'JetBrains Mono', monospace;
  font-weight: 700;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  cursor: pointer;
  transition: opacity 0.2s;
}
.apply-btn:hover { opacity: 0.85; }

/* ---- Charts ---- */
.charts-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.chart-container {
  background: var(--input-bg);
  border: 1px solid var(--border);
  border-radius: 2px;
  padding: 1rem;
  height: 350px;
  position: relative;
}

.chart-container.full-width {
  grid-column: span 2;
}

.chart-title {
  font-size: 0.75rem;
  font-weight: 600;
  margin-bottom: 0.8rem;
  color: var(--ink);
  letter-spacing: 0.02em;
}

/* ---- Theme Toggle ---- */
.theme-toggle {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 1px solid var(--border);
  cursor: pointer;
  padding: 0;
  z-index: 30;
  transition: all 0.3s ease;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
}
.theme-toggle:hover { transform: scale(1.08); }
[data-theme="light"] .theme-toggle {
  background: linear-gradient(135deg, #07070d 0%, #64dcff 100%);
  border-color: rgba(26, 29, 34, 0.2);
}
[data-theme="tokyo"] .theme-toggle {
  background: #f4f1ec;
  border-color: rgba(100, 220, 255, 0.4);
  box-shadow:
    0 0 10px rgba(100, 220, 255, 0.5),
    0 0 25px rgba(100, 220, 255, 0.3);
}

@media (max-width: 820px) {
  nav {
    gap: 0.5rem;
    padding: 0.85rem 0.85rem;
  }
  .back-link { font-size: 0.58rem; padding: 0.25rem 0.4rem; letter-spacing: 0.08em; }
  .nav-brand { font-size: 0.9rem; }
  .brand-sub { font-size: 0.6rem; letter-spacing: 0.1em; }
  .page-body { padding: calc(55px + 1.25rem) 1rem 3rem; }
  .dashboard { padding: 1.5rem; }
  .charts-grid { grid-template-columns: 1fr; }
  .chart-container.full-width { grid-column: span 1; }
  .filter-group { min-width: unset; }
  .filters { grid-template-columns: 1fr 1fr; }
  .apply-btn { grid-column: span 2; }
  .theme-toggle { width: 20px; height: 20px; bottom: 1rem; right: 0.9rem; }
}

@media (max-width: 460px) {
  .nav-brand .brand-sub { display: none; }
  .nav-brand .brand-sep { display: none; }
  .dashboard { padding: 1rem; }
  .filters { grid-template-columns: 1fr; }
  .apply-btn { grid-column: span 1; }
}