:root {
  --brand: #2563eb;
  --brand-soft: #93b4f5;
  --ink: #1f2933;
  --muted: #7b8794;
  --line: #e4e7eb;
  --bg: #f7f8fa;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

.screen { display: none; }
.screen:not([hidden]) { display: block; }

.loading {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100vh;
  color: var(--muted);
}

/* Connect screen */
#connect:not([hidden]) {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 24px;
}
.connect-card {
  max-width: 360px;
  text-align: center;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 32px 24px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}
.connect-card h1 { font-size: 22px; margin: 0 0 12px; }
.connect-card p { margin: 0; color: var(--muted); line-height: 1.5; }
.connect-card strong { color: var(--ink); }

/* Tab strip — sticky, horizontally scrollable on overflow */
.tabstrip {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  gap: 4px;
  padding: 8px 8px 0;
  background: #fff;
  border-bottom: 1px solid var(--line);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}
.tabstrip::-webkit-scrollbar { display: none; }
.tab {
  flex: 0 0 auto;
  border: none;
  background: none;
  padding: 12px 14px;
  font-size: 14px;
  font-weight: 600;
  color: var(--muted);
  border-bottom: 2px solid transparent;
  cursor: pointer;
  white-space: nowrap;
}
.tab.active { color: var(--brand); border-bottom-color: var(--brand); }

.panel { padding: 16px; }
.panel[hidden] { display: none; }

/* Range selector row */
.range-row { display: flex; gap: 6px; margin-bottom: 14px; flex-wrap: wrap; }
.range {
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 999px;
  padding: 6px 12px;
  font-size: 13px;
  color: var(--muted);
  cursor: pointer;
}
.range.active { background: var(--brand); border-color: var(--brand); color: #fff; }

.chart-wrap {
  position: relative;
  height: 60vh;
  min-height: 280px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 12px;
}

.empty {
  text-align: center;
  color: var(--ink);
  padding: 48px 16px;
}
.empty .muted, .muted { color: var(--muted); }
.empty p { margin: 6px 0; }

.banner {
  margin: 16px;
  padding: 12px 14px;
  border-radius: 10px;
  background: #fff4e5;
  color: #8a5a00;
  border: 1px solid #ffd9a0;
  font-size: 14px;
}
.banner[hidden] { display: none; }