:root {
  --bg: #f4f8fc;
  --surface: #ffffff;
  --text: #2e4057;
  --muted: #6b8299;
  --border: #d4e2f0;
  --blue-light: #e8f1fa;
  --blue: #c5daf2;
  --blue-accent: #6b9fd4;

  --radius: 12px;
  --font: 'Vazirmatn', system-ui, sans-serif;
}

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

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-align: justify;
  text-justify: inter-word;
}

.container {
  width: 100%;
  max-width: 720px;
  margin: 0 auto;
  padding: 0 20px;
}

.page {
  padding: 64px 0 80px;
}

/* Intro */
.intro {
  text-align: center;
  margin-bottom: 40px;
}

.intro__brand {
  font-size: 0.85rem;
  color: var(--blue-accent);
  margin-bottom: 12px;
  letter-spacing: 1px;
  text-align: center;
}

.intro h1 {
  font-size: clamp(1.6rem, 5vw, 2.2rem);
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.3px;
  text-align: center;
}

.intro__name {
  margin-top: 10px;
  font-size: 0.95rem;
  color: var(--muted);
  text-align: center;
}

/* Accordion */
.accordion {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.accordion__item {
  border-bottom: 1px solid var(--border);
}

.accordion__item:last-child {
  border-bottom: none;
}

.accordion__trigger {
  width: 100%;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 20px;
  background: var(--surface);
  border: none;
  font-family: var(--font);
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text);
  cursor: pointer;
  text-align: justify;
  transition: background 0.2s;
}

.accordion__trigger:hover {
  background: var(--blue-light);
}

.accordion__item.open .accordion__trigger {
  background: var(--blue-light);
}

.accordion__icon {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  margin-top: 2px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  font-weight: 400;
  color: var(--blue-accent);
  transition: transform 0.25s ease;
}

.accordion__trigger .accordion__q {
  line-height: 1.65;
  flex: 1;
}

.accordion__item.open .accordion__icon {
  transform: rotate(45deg);
}

.accordion__panel {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
  background: var(--surface);
}

.accordion__item.open .accordion__panel {
  overflow: visible;
}

.accordion__a pre.diagram,
.accordion__a .diagram {
  direction: ltr;
  text-align: left;
  white-space: pre;
  font-size: 0.8rem;
}

.accordion__divider {
  height: 1px;
  background: var(--border);
  margin: 0 20px;
  opacity: 0;
  transition: opacity 0.2s;
}

.accordion__item.open .accordion__divider {
  opacity: 1;
}

.accordion__a {
  padding: 16px 20px 20px;
  font-size: 0.9rem;
  color: var(--muted);
  line-height: 1.8;
  background: var(--surface);
}

.accordion__a p {
  margin-bottom: 12px;
}

.accordion__a p:last-child {
  margin-bottom: 0;
}

.accordion__a h4 {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text);
  margin: 20px 0 10px;
}

.accordion__a h4:first-child {
  margin-top: 0;
}

.accordion__a ul {
  margin: 8px 0 12px;
  padding-right: 20px;
}

.accordion__a li {
  margin-bottom: 4px;
}

.accordion__a a {
  color: var(--blue-accent);
  text-decoration: underline;
}

.accordion__a code {
  font-size: 0.82rem;
  background: var(--blue-light);
  padding: 2px 6px;
  border-radius: 4px;
  direction: ltr;
  display: inline-block;
}

.accordion__a table {
  width: 100%;
  border-collapse: collapse;
  margin: 12px 0;
  font-size: 0.85rem;
}

.accordion__a th,
.accordion__a td {
  border: 1px solid var(--border);
  padding: 8px 10px;
  text-align: justify;
}

.accordion__a th {
  background: var(--blue-light);
  color: var(--text);
  font-weight: 600;
}

.accordion__a pre {
  background: var(--blue-light);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px;
  margin: 12px 0;
  overflow-x: auto;
  font-size: 0.78rem;
  line-height: 1.6;
  color: var(--text);
  direction: ltr;
  text-align: left;
}

@media (max-width: 480px) {
  .page {
    padding: 48px 0 64px;
  }

  .accordion__trigger {
    padding: 16px 18px;
    font-size: 0.9rem;
  }

  .accordion__a {
    padding: 14px 18px 18px;
  }

  .accordion__a table {
    display: block;
    overflow-x: auto;
  }
}