/* ========== Theme Colors (requested accent) ========== */
:root {
  --accent: rgb(212, 61, 15);            /* Primary accent color */
  --accent-ink: #ffffff;                  /* Text on accent */
  --ink: #1d1d1f;                         /* Primary text */
  --muted-ink: #4b4b4b;                   /* Secondary text */
  --card-bg: #ffffff;                     /* Card background */
  --page-bg: #fafafa;                     /* Page background */
  --border: rgba(212, 61, 15, 0.65);      /* Border color themed */
  --accent-soft: rgba(212, 61, 15, 0.08); /* Soft tint for backgrounds */
}

/* ========== Page Layout ========== */
* { box-sizing: border-box; }
html, body {
  margin: 0;
  padding: 0;
  background: var(--page-bg);
  color: var(--ink);
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  line-height: 1.5;
}

.site-header {
  background: var(--accent);
  color: var(--accent-ink);
  padding: 1.5rem 1rem;
  border-bottom: 4px solid var(--border);
}
.site-header h1 { margin: 0 0 0.25rem 0; }
.site-header .tagline { margin: 0; opacity: 0.95; }

.container {
  max-width: 1000px;
  margin: 1.25rem auto;
  padding: 0 1rem;
}

.card {
  background: var(--card-bg);
  border: 2px solid var(--border);  /* Requested table/border style */
  border-radius: 12px;
  padding: 1rem 1.25rem;
  margin-bottom: 1rem;
  box-shadow: 0 1px 4px rgba(0,0,0,0.05);
}

/* ========== Headings ========== */
h2 {
  margin-top: 0;
  color: var(--accent);
  border-left: 6px solid var(--accent);
  padding-left: 0.5rem;
}

/* ========== Tables ========== */
.summary-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 0.75rem;
  background: #fff;
  border: 2px solid var(--border);
}
.summary-table th, .summary-table td {
  border: 1px solid var(--border);
  padding: 0.6rem 0.5rem;
  vertical-align: top;
}
.summary-table thead th {
  background: var(--accent);
  color: var(--accent-ink);
  text-align: left;
}
.summary-table tbody tr:nth-child(even) {
  background: var(--accent-soft);
}

/* ========== Notes, Code, Examples ========== */
.note {
  background: var(--accent-soft);
  border-left: 4px solid var(--accent);
  padding: 0.5rem 0.75rem;
  color: var(--muted-ink);
}
.example { margin-top: 1rem; }
.code {
  display: block;
  background: #111;
  color: #eaeaea;
  padding: 0.75rem;
  border-radius: 8px;
  overflow-x: auto;
  border: 1px solid #333;
}

/* ========== Toggle Button and Solution Panel ========== */
.btn {
  display: inline-block;
  font-weight: 600;
  padding: 0.6rem 0.9rem;
  border: 2px solid var(--accent);
  background: var(--accent);
  color: var(--accent-ink);
  border-radius: 10px;
  cursor: pointer;
}
.btn:hover {
  filter: brightness(0.95);
}
.solution {
  margin-top: 0.75rem;
  padding: 0.75rem;
  background: #fff;
  border: 2px dashed var(--border);
  border-radius: 10px;
}
.hidden { display: none; }

/* ========== Footer ========== */
.site-footer {
  text-align: center;
  color: var(--muted-ink);
  padding: 1.25rem 1rem 2rem;
}