/* ===============================
   Base & Variables
================================ */
:root {
  --bg: #f7f8fa;
  --card: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
  --primary: #2563eb;
  --primary-soft: #e0e7ff;
  --danger: #dc2626;
  --danger-soft: #fee2e2;
  --border: #e5e7eb;
  --code-bg: #f3f4f6;
  --code-dark: #111827;
  --radius: 14px;
  --radius-sm: 10px;
  --shadow: 0 10px 25px rgba(0,0,0,0.05);
}

/* ===============================
   Reset
================================ */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI",
    "Vazirmatn", "IRANSans", Tahoma, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.85;
}

/* ===============================
   Layout
================================ */
.container {
  width: min(1100px, 92%);
  margin-inline: auto;
}

main.container {
  margin-block: 3rem;
}

section {
  margin-bottom: 2.5rem;
}

/* ===============================
   Header / Hero
================================ */
.header {
  background: linear-gradient(135deg, #0f172a, #1e3a8a);
  color: #fff;
}

.header .container {
  padding: 2.5rem 0;
}

.header h1 {
  margin: 0.8rem 0 0;
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  font-weight: 800;
}

/* Hero (index) */
.hero {
  padding: 4rem 0;
}

.hero-inner {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 2rem;
  align-items: center;
}

.hero-logo {
  width: 90px;
  height: auto;
}

.hero-text h1 {
  line-height: 1.4;
}

.hero-sub {
  color: #dbeafe;
  max-width: 720px;
}

.badge {
  display: inline-block;
  background: rgba(255,255,255,0.15);
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  font-size: 0.8rem;
}

/* ===============================
   Breadcrumb
================================ */
.breadcrumb {
  font-size: 0.85rem;
  color: #c7d2fe;
}

.breadcrumb a {
  color: #e0e7ff;
  text-decoration: none;
}

.breadcrumb a:hover {
  text-decoration: underline;
}

/* ===============================
   Panels / Cards
================================ */
.panel,
.intro-card,
.notes {
  background: var(--card);
  border-radius: var(--radius);
  padding: 1.8rem 2rem;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
}

.panel h2,
.panel h3 {
  margin-top: 0;
}

.intro-card {
  background: linear-gradient(180deg, #ffffff, #f8fafc);
}

/* ===============================
   Sections list (index)
================================ */
.sections ul {
  list-style: none;
  padding: 0;
  margin: 1.5rem 0 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
}

.sections a {
  display: block;
  padding: 1rem 1.2rem;
  border-radius: var(--radius-sm);
  background: #f9fafb;
  border: 1px solid var(--border);
  color: var(--text);
  text-decoration: none;
  font-weight: 600;
}

.sections a:hover {
  background: var(--primary-soft);
  border-color: var(--primary);
  color: var(--primary);
}

/* ===============================
   Text utilities
================================ */
.text-muted {
  color: var(--muted);
}

strong {
  font-weight: 700;
}

/* ===============================
   Callouts
================================ */
.callout {
  margin: 1.5rem 0;
  padding: 1rem 1.2rem;
  border-radius: var(--radius-sm);
  background: #f1f5f9;
  border-right: 4px solid var(--primary);
}

.callout.danger {
  background: var(--danger-soft);
  border-right-color: var(--danger);
}

/* ===============================
   Tables
================================ */
table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 1rem;
  font-size: 0.95rem;
}

th, td {
  border: 1px solid var(--border);
  padding: 0.75rem;
  text-align: right;
}

th {
  background: #f3f4f6;
}

/* ===============================
   Code blocks
================================ */
pre, code {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}

.code-block {
  position: relative;
  background: var(--code-bg);
  border-radius: var(--radius-sm);
  padding: 1rem;
  overflow-x: auto;
  margin: 1rem 0;
}

.code-block.dark {
  background: var(--code-dark);
  color: #e5e7eb;
}

.code-block code {
  direction: ltr;
  text-align: left;
  display: block;
  white-space: pre;
}

.copy-btn {
  position: absolute;
  top: 0.6rem;
  left: 0.6rem;
  font-size: 0.7rem;
  padding: 0.3rem 0.6rem;
  border-radius: 6px;
  border: none;
  background: #e5e7eb;
  cursor: pointer;
}

.code-block.dark .copy-btn {
  background: #374151;
  color: #fff;
}

/* ===============================
   Footer
================================ */
.footer {
  margin-top: 4rem;
  padding: 2rem 0;
  text-align: center;
  font-size: 0.85rem;
  color: var(--muted);
}

/* ===============================
   Responsive
================================ */
@media (max-width: 768px) {
  .hero-inner {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero-logo {
    margin-inline: auto;
  }

  .sections ul {
    grid-template-columns: 1fr;
  }

  table {
    font-size: 0.85rem;
  }
}