:root {
  --bg: #fafafa;
  --card-bg: #ffffff;
  --text: #222222;
  --muted: #666666;
  --ce: #1976d2;
  --pe: #d84315;
  --success: #2e7d32;
  --danger: #c62828;
  --shadow: 0 2px 6px rgba(0,0,0,0.06);
  --shadow-hover: 0 4px 10px rgba(0,0,0,0.1);
  --radius: 8px;
}

* {
  box-sizing: border-box;
}

body {
  font-family: Arial, Helvetica, sans-serif;
  background: var(--bg);
  color: var(--text);
  margin: 0;
  padding: 20px;
  line-height: 1.4;
}

h1 {
  font-size: 1.5rem;
  margin: 0 0 8px;
}

h2 {
  font-size: 1.25rem;
  margin: 24px 0 12px;
}

h3 {
  font-size: 1.05rem;
  margin: 16px 0 8px;
}

a {
  color: var(--ce);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.logo {
  height: 144px;
  width: auto;
  max-width: 125%;
  object-fit: contain;
  margin-bottom: 16px;
  background: transparent; /* ensure no background */
}

/* Top navigation */
.top-nav {
  margin-bottom: 16px;
  font-size: 0.95rem;
}

.top-nav a {
  color: var(--ce);
  text-decoration: none;
  margin-right: 14px;
  padding: 6px 10px;
  border-radius: 6px;
}

.top-nav a:hover {
  background: #eef4fb;
  text-decoration: none;
}

/* Options sub-nav (tabs) */
.options-tabs {
  display: flex;
  gap: 8px;
  margin: 12px 0 20px;
  border-bottom: 1px solid #ddd;
  flex-wrap: wrap;
}

.options-tabs a {
  padding: 8px 14px;
  border: 1px solid transparent;
  border-bottom: none;
  border-radius: 6px 6px 0 0;
  font-size: 0.95rem;
  color: var(--ce);
  background: #f5f5f5;
}

.options-tabs a.active {
  background: #fff;
  border-color: #ddd;
  font-weight: 600;
}

.options-tabs a:hover {
  background: #fff;
  text-decoration: none;
}

/* Cards */
.card {
  background: var(--card-bg);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 16px;
  margin: 16px 0;
}

.card:hover {
  box-shadow: var(--shadow-hover);
  transition: box-shadow 0.2s ease;
}

.card h3 {
  margin-top: 0;
}

/* Stats bar */
.stats-bar {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 12px;
  margin: 16px 0 24px;
}

.stat-card {
  background: var(--card-bg);
  padding: 14px 16px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  font-size: 0.95rem;
}

.stat-card .label {
  color: var(--muted);
  font-size: 0.85rem;
  margin-bottom: 6px;
}

.stat-card .value {
  font-weight: bold;
  font-size: 1.05rem;
}

/* Tables */
table {
  border-collapse: collapse;
  width: 100%;
  font-size: 0.85rem;
  margin-top: 16px;
  background: var(--card-bg);
}

th, td {
  border: 1px solid #ddd;
  padding: 6px 8px;
  text-align: right;
}

th {
  background: #f5f5f5;
  text-align: center;
  font-weight: 600;
}

td.symbol {
  text-align: left;
}

/* Utility */
.loading {
  color: var(--muted);
  font-style: italic;
}

.section-title {
  font-size: 1.1rem;
  margin: 24px 0 12px;
  font-weight: bold;
}

/* Responsive grids */
.charts-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  margin-top: 24px;
}

.key-levels-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: 24px;
}

@media (min-width: 900px) {
  .charts-grid {
    grid-template-columns: 1fr 1fr;
  }

  .key-levels-grid {
    grid-template-columns: 1fr 1fr;
  }
}