:root {
  --bg: #070b14;
  --bg-elevated: #0d1321;
  --surface: rgba(18, 24, 41, 0.72);
  --surface-solid: #121829;
  --border: rgba(148, 163, 184, 0.14);
  --text: #eef2ff;
  --muted: #94a3b8;
  --accent: #818cf8;
  --accent-strong: #6366f1;
  --cyan: #22d3ee;
  --green: #4ade80;
  --amber: #fbbf24;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.45);
  --max: 1140px;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: 'Vazirmatn', ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  overflow-x: hidden;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse 70% 50% at 15% -5%, rgba(99, 102, 241, 0.22), transparent 55%),
    radial-gradient(ellipse 50% 40% at 90% 10%, rgba(34, 211, 238, 0.12), transparent 50%),
    radial-gradient(ellipse 40% 30% at 50% 100%, rgba(99, 102, 241, 0.08), transparent 60%);
  pointer-events: none;
  z-index: -1;
}

.wrap { max-width: var(--max); margin: 0 auto; padding: 0 1.25rem; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(14px);
  background: rgba(7, 11, 20, 0.78);
  border-bottom: 1px solid var(--border);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.9rem 0;
  flex-wrap: wrap;
}

.logo-mark {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: -0.02em;
  text-decoration: none;
  color: var(--text);
}

.logo-mark img { width: 34px; height: 34px; flex-shrink: 0; }
.logo-mark span { color: var(--text); white-space: nowrap; }

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  flex-wrap: wrap;
}

.nav-links a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.88rem;
  padding: 0.45rem 0.75rem;
  border-radius: 999px;
  transition: color 0.15s, background 0.15s;
}

.nav-links a:hover {
  color: var(--text);
  background: rgba(255, 255, 255, 0.04);
}

.nav-right { display: flex; align-items: center; gap: 0.75rem; flex-wrap: wrap; }

.lang-switch { display: flex; gap: 0.35rem; }

.lang-switch button {
  background: var(--surface-solid);
  border: 1px solid var(--border);
  color: var(--muted);
  border-radius: 999px;
  padding: 0.28rem 0.7rem;
  cursor: pointer;
  font: inherit;
  font-size: 0.78rem;
}

.lang-switch button.active {
  color: var(--text);
  border-color: var(--accent);
  background: rgba(99, 102, 241, 0.12);
}

.hero {
  padding: 4.5rem 0 3.5rem;
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 3rem;
  align-items: center;
}

@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; padding-top: 3rem; }
  .nav-links { display: none; }
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--cyan);
  margin-bottom: 1rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.badges { display: flex; gap: 0.5rem; flex-wrap: wrap; margin-bottom: 1.25rem; }

.badge {
  font-size: 0.72rem;
  padding: 0.28rem 0.65rem;
  border-radius: 999px;
  background: rgba(99, 102, 241, 0.12);
  color: var(--accent);
  border: 1px solid rgba(99, 102, 241, 0.28);
}

h1 {
  font-size: clamp(2.1rem, 5vw, 3.35rem);
  line-height: 1.08;
  letter-spacing: -0.035em;
  margin-bottom: 1rem;
}

.hero-sub {
  font-size: 1.12rem;
  color: var(--muted);
  max-width: 36rem;
  margin-bottom: 1.75rem;
}

.hero-sub strong { color: var(--text); font-weight: 600; }

.cta-row { display: flex; gap: 0.75rem; flex-wrap: wrap; margin-bottom: 1.5rem; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  padding: 0.82rem 1.35rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.94rem;
  text-decoration: none;
  border: 1px solid transparent;
  transition: transform 0.15s, box-shadow 0.15s, background 0.15s;
}

.btn:hover { transform: translateY(-1px); }

.btn-primary {
  background: linear-gradient(135deg, #6366f1, #4f46e5);
  color: #fff;
  box-shadow: 0 8px 28px rgba(99, 102, 241, 0.35);
}

.btn-secondary {
  background: var(--surface-solid);
  color: var(--text);
  border-color: var(--border);
}

.btn-ghost {
  background: transparent;
  color: var(--muted);
  border-color: var(--border);
}

.trust-row {
  display: flex;
  gap: 1.25rem;
  flex-wrap: wrap;
  color: var(--muted);
  font-size: 0.82rem;
}

.trust-row span { display: inline-flex; align-items: center; gap: 0.35rem; }
.trust-row .dot-live {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 10px var(--green);
}

.hero-panel {
  background: rgba(13, 17, 23, 0.92);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}

.panel-bar {
  background: #161b22;
  padding: 0.65rem 1rem;
  display: flex;
  gap: 0.4rem;
  border-bottom: 1px solid var(--border);
}

.dot { width: 10px; height: 10px; border-radius: 50%; }
.dot-r { background: #ff5f57; }
.dot-y { background: #febc2e; }
.dot-g { background: #28c840; }

.panel-body {
  padding: 1.25rem 1.35rem;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.8rem;
  line-height: 1.75;
  direction: ltr;
  text-align: left;
  color: #c9d1d9;
}

.t-comment { color: #8b949e; }
.t-cmd { color: var(--green); }
.t-out { color: #79c0ff; }

section.block { padding: 4rem 0; border-top: 1px solid var(--border); }

.section-head { max-width: 720px; margin-bottom: 2.25rem; }

.section-head h2 {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  letter-spacing: -0.03em;
  margin-bottom: 0.75rem;
}

.section-head p { color: var(--muted); font-size: 1.02rem; }

.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1rem;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1rem;
}

.card {
  background: var(--surface);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.35rem 1.4rem;
}

.card-icon {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  display: grid;
  place-items: center;
  background: rgba(99, 102, 241, 0.14);
  color: var(--accent);
  font-size: 1.1rem;
  margin-bottom: 0.85rem;
}

.card h3 {
  font-size: 1.02rem;
  margin-bottom: 0.45rem;
  letter-spacing: -0.02em;
}

.card p { color: var(--muted); font-size: 0.92rem; }

.problem-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

@media (max-width: 760px) { .problem-grid { grid-template-columns: 1fr; } }

.problem-card.bad { border-color: rgba(248, 113, 113, 0.25); }
.problem-card.good { border-color: rgba(74, 222, 128, 0.25); }

.flow-strip {
  display: flex;
  align-items: stretch;
  justify-content: center;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin: 2rem 0 1.25rem;
}

.flow-node {
  background: var(--surface-solid);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.75rem 1rem;
  min-width: 120px;
  text-align: center;
}

.flow-node strong { display: block; font-size: 0.88rem; margin-bottom: 0.15rem; }
.flow-node span { color: var(--muted); font-size: 0.78rem; }

.flow-arrow { color: var(--accent); align-self: center; font-size: 1.1rem; }

.guide-shell {
  background: linear-gradient(180deg, rgba(18, 24, 41, 0.9), rgba(18, 24, 41, 0.55));
  border: 1px solid var(--border);
  border-radius: calc(var(--radius) + 4px);
  padding: 1.5rem;
}

.guide-tabs {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-bottom: 1.25rem;
}

.guide-tab {
  border: 1px solid var(--border);
  background: transparent;
  color: var(--muted);
  border-radius: 999px;
  padding: 0.45rem 0.9rem;
  font: inherit;
  font-size: 0.85rem;
  cursor: pointer;
}

.guide-tab.active {
  color: var(--text);
  border-color: var(--accent);
  background: rgba(99, 102, 241, 0.12);
}

.steps { display: grid; gap: 1rem; }

/* `.steps` sets display:grid and overrides the HTML [hidden] attribute otherwise */
.steps[hidden] { display: none !important; }

.step {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1rem;
  padding: 1.1rem 1.15rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: rgba(7, 11, 20, 0.55);
}

.step-num {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-weight: 700;
  font-size: 0.9rem;
  background: rgba(99, 102, 241, 0.18);
  color: var(--accent);
  flex-shrink: 0;
}

.step h4 { font-size: 1rem; margin-bottom: 0.35rem; }
.step p, .step li { color: var(--muted); font-size: 0.9rem; }
.step a { color: var(--accent); text-decoration: none; }
.step a:hover { text-decoration: underline; }
.step code { font-size: 0.85em; }
.step ul { margin: 0.5rem 0 0 1.1rem; }
.step li { margin-bottom: 0.35rem; }

pre, .code-block {
  background: #0d1117;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 1rem 1.1rem;
  overflow-x: auto;
  font-size: 0.82rem;
  direction: ltr;
  text-align: left;
  margin-top: 0.75rem;
}

code { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }

.inline-code {
  background: rgba(99, 102, 241, 0.12);
  border: 1px solid rgba(99, 102, 241, 0.22);
  padding: 0.1rem 0.35rem;
  border-radius: 6px;
  font-size: 0.86em;
}

.faq { display: grid; gap: 0.65rem; }

.faq details {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: rgba(7, 11, 20, 0.45);
  padding: 0.85rem 1rem;
}

.faq summary {
  cursor: pointer;
  font-weight: 600;
  list-style: none;
}

.faq summary::-webkit-details-marker { display: none; }

.faq p { color: var(--muted); margin-top: 0.65rem; font-size: 0.92rem; }

.cta-band {
  margin: 0 0 4rem;
  padding: 2rem 1.5rem;
  border-radius: calc(var(--radius) + 6px);
  border: 1px solid rgba(99, 102, 241, 0.35);
  background:
    radial-gradient(ellipse 80% 120% at 50% 0%, rgba(99, 102, 241, 0.18), transparent 60%),
    var(--surface-solid);
  text-align: center;
}

.cta-band h2 { font-size: 1.75rem; margin-bottom: 0.65rem; }
.cta-band p { color: var(--muted); max-width: 560px; margin: 0 auto 1.25rem; }

.site-footer {
  padding: 2rem 0 2.5rem;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.85rem;
  text-align: center;
}

.site-footer a { color: var(--accent); text-decoration: none; }
.site-footer a:hover { text-decoration: underline; }

body.rtl .nav-links a { margin: 0; }
body.rtl .step ul { margin: 0.5rem 1.1rem 0 0; }
body.rtl .hero-panel, body.rtl pre, body.rtl .code-block { direction: ltr; text-align: left; }