:root {
  --bg: #f7f8fa;
  --bg-alt: #ffffff;
  --text: #17202b;
  --text-muted: #4b5768;
  --border: #e2e6eb;
  --brand: #14532d;
  --brand-strong: #0d3b20;
  --accent: #e08a1e;
  --accent-strong: #b96f13;
  --pill-bg: #fff4e2;
  --pill-text: #8a5a10;
  --card-shadow: 0 1px 2px rgba(23, 32, 43, 0.06), 0 8px 24px rgba(23, 32, 43, 0.05);
  --radius: 14px;
  --max-width: 1040px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #10151c;
    --bg-alt: #171e27;
    --text: #edf1f5;
    --text-muted: #9aa7b6;
    --border: #2a3543;
    --brand: #4ade80;
    --brand-strong: #6ee89c;
    --accent: #f2a13c;
    --accent-strong: #ffb75c;
    --pill-bg: #2a2110;
    --pill-text: #f2c579;
    --card-shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 8px 28px rgba(0, 0, 0, 0.35);
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

html[lang="fa"] body {
  font-family: "Vazirmatn", Tahoma, -apple-system, "Segoe UI", sans-serif;
}

.wrap {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* Nav */
header.site {
  padding: 20px 0 0;
}
nav.site {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}
.wordmark {
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--text);
  text-decoration: none;
  letter-spacing: -0.01em;
}
.wordmark span { color: var(--accent); }
.lang-switch {
  display: flex;
  gap: 4px;
  font-size: 0.9rem;
}
.lang-switch a {
  color: var(--text-muted);
  text-decoration: none;
  padding: 6px 10px;
  border-radius: 999px;
}
.lang-switch a[aria-current="true"] {
  color: var(--text);
  background: var(--bg-alt);
  border: 1px solid var(--border);
  font-weight: 600;
}
.lang-switch a:hover { color: var(--text); }

/* Hero */
.hero {
  padding: 64px 0 40px;
  text-align: center;
}
.pill {
  display: inline-block;
  background: var(--pill-bg);
  color: var(--pill-text);
  font-size: 0.82rem;
  font-weight: 600;
  padding: 6px 14px;
  border-radius: 999px;
  margin-bottom: 20px;
}
.hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.2rem);
  margin: 0 0 14px;
  letter-spacing: -0.02em;
}
.hero p.tagline {
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  color: var(--text-muted);
  max-width: 640px;
  margin: 0 auto 30px;
}
.cta-row {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: 10px;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.98rem;
  border: 1px solid transparent;
}
.btn-primary {
  background: var(--accent);
  color: #241505;
}
.btn-primary:hover { background: var(--accent-strong); }
.btn-secondary {
  background: transparent;
  color: var(--text);
  border-color: var(--border);
}
.btn-secondary:hover { border-color: var(--text-muted); }

/* Sections */
section { padding: 40px 0; }
section h2 {
  font-size: clamp(1.4rem, 3vw, 1.8rem);
  margin: 0 0 8px;
  letter-spacing: -0.01em;
}
section > .wrap > p.lead {
  color: var(--text-muted);
  max-width: 700px;
  margin: 0 0 28px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
}
.card {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--card-shadow);
}
.card h3 {
  margin: 0 0 8px;
  font-size: 1.02rem;
}
.card p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.94rem;
}

.oss-box {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--card-shadow);
}
.oss-box h2 { margin-top: 0; }
.oss-box a.repo-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 12px;
  color: var(--brand);
  font-weight: 600;
  text-decoration: none;
}
.oss-box a.repo-link:hover { text-decoration: underline; }

.personas {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
}
.persona {
  text-align: center;
  padding: 18px 12px;
}
.persona .emoji { font-size: 1.8rem; display: block; margin-bottom: 8px; }
.persona h3 { margin: 0 0 6px; font-size: 0.98rem; }
.persona p { margin: 0; color: var(--text-muted); font-size: 0.88rem; }

footer.site {
  border-top: 1px solid var(--border);
  margin-top: 40px;
  padding: 28px 0 48px;
  color: var(--text-muted);
  font-size: 0.88rem;
}
footer.site .foot-links {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
  margin-bottom: 10px;
}
footer.site a { color: var(--text-muted); }
footer.site a:hover { color: var(--text); }

.legal-page .wrap { max-width: 760px; }
.legal-page h1 { margin-top: 40px; }
.legal-page .draft-note {
  background: var(--pill-bg);
  color: var(--pill-text);
  border-radius: var(--radius);
  padding: 14px 18px;
  font-size: 0.92rem;
  margin: 20px 0 32px;
}
.legal-page table { width: 100%; border-collapse: collapse; margin: 16px 0; font-size: 0.9rem; }
.legal-page th, .legal-page td { border: 1px solid var(--border); padding: 8px 10px; text-align: left; }

/* Chat box */
.chat-card {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--card-shadow);
  padding: 20px;
  max-width: 640px;
  margin: 0 auto;
}
.chat-placeholder {
  text-align: center;
  color: var(--text-muted);
  padding: 28px 10px;
  font-size: 0.95rem;
}
.chat-log {
  display: flex;
  flex-direction: column;
  gap: 10px;
  max-height: 360px;
  min-height: 120px;
  overflow-y: auto;
  padding: 4px 2px 12px;
}
.chat-msg { display: flex; }
.chat-msg-user { justify-content: flex-end; }
.chat-msg-assistant { flex-direction: column; align-items: flex-start; }
.chat-bubble {
  max-width: 88%;
  padding: 10px 14px;
  border-radius: 12px;
  font-size: 0.94rem;
  line-height: 1.5;
  white-space: pre-wrap;
}
.chat-msg-user .chat-bubble {
  background: var(--accent);
  color: #241505;
  border-bottom-right-radius: 4px;
}
html[dir="rtl"] .chat-msg-user .chat-bubble { border-bottom-right-radius: 12px; border-bottom-left-radius: 4px; }
.chat-msg-assistant .chat-bubble {
  background: var(--bg);
  border: 1px solid var(--border);
  border-bottom-left-radius: 4px;
}
html[dir="rtl"] .chat-msg-assistant .chat-bubble { border-bottom-left-radius: 12px; border-bottom-right-radius: 4px; }
.chat-form {
  display: flex;
  gap: 8px;
  border-top: 1px solid var(--border);
  padding-top: 14px;
}
.chat-input {
  flex: 1;
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font-size: 0.95rem;
}
.chat-input:disabled { opacity: 0.6; }
.chat-note {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin: 10px 0 0;
  text-align: center;
}
.chat-feedback {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-top: 6px;
  font-size: 0.8rem;
  color: var(--text-muted);
}
.chat-vote {
  border: 1px solid var(--border);
  background: var(--bg-alt);
  border-radius: 999px;
  padding: 2px 8px;
  cursor: pointer;
  font-size: 0.95rem;
  line-height: 1.4;
}
.chat-vote:hover { border-color: var(--text-muted); }
.chat-vote:disabled { opacity: 0.5; cursor: default; }