:root {
  color-scheme: dark;
  --bg: #080909;
  --card: #121514;
  --border: #303633;
  --text: #f4f5f4;
  --muted: #b6beb8;
  --green: #187d3c;
  --green-hover: #126731;
  --container: 80rem;
  --header-height: 5.25rem;
}

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

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: Tahoma, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.85;
  overflow-wrap: anywhere;
}

img { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; }
[hidden] { display: none !important; }

:focus-visible {
  outline: 3px solid #a0efb5;
  outline-offset: 5px;
}

main[id], section[id], article[id] {
  scroll-margin-top: calc(var(--header-height) + 1.25rem);
}

.container {
  width: min(calc(100% - clamp(1.5rem, 4vw, 4rem)), var(--container));
  margin-inline: auto;
}

.skip-link {
  position: fixed;
  inset-block-start: 0.75rem;
  inset-inline-start: 0.75rem;
  z-index: 30;
  padding: 0.65rem 1rem;
  border-radius: 0.5rem;
  background: var(--text);
  color: var(--bg);
  transform: translateY(calc(-100% - 1.5rem));
}

.skip-link:focus { transform: none; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: #0b0d0c;
  border-bottom: 1px solid var(--border);
}

.header-inner {
  min-height: 5.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-block: 0.75rem;
}

.brand { display: inline-flex; align-items: center; gap: 0.75rem; }
.brand-text { display: flex; flex-direction: column; line-height: 1.5; }
.brand-text strong { font-size: clamp(1.4rem, 2.5vw, 1.85rem); }
.brand-text span { font-size: 0.875rem; color: var(--muted); }
.brand-logo { width: 3rem; height: 3rem; object-fit: cover; border-radius: 0.75rem; }

.site-nav { display: flex; align-items: center; gap: 0.5rem; }
.site-nav a {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 2.75rem;
  padding: 0.45rem 1rem;
  border: 1px solid transparent;
  border-radius: 0.75rem;
  font-size: 0.9375rem;
}

.site-nav a:hover { background: #1c211e; border-color: var(--border); }
.menu-toggle {
  display: none;
  flex: 0 0 3rem;
  width: 3rem;
  height: 3rem;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  background: var(--card);
  cursor: pointer;
}

.menu-toggle span { width: 20px; height: 2px; background: var(--text); border-radius: 2px; }
.menu-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.menu-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.menu-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.hero { padding-block: clamp(2rem, 5vw, 4.5rem); }
.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  align-items: center;
  gap: clamp(1.5rem, 3vw, 3rem);
}

.hero-grid > * { min-width: 0; }
.eyebrow { margin: 0 0 0.75rem; color: var(--muted); font-size: 0.9375rem; }
.hero h1 {
  margin: 0;
  font-size: clamp(2rem, 3.6vw, 3.4rem);
  line-height: 1.5;
  font-weight: 800;
}

.highlight {
  white-space: nowrap;
}

.hero-text { margin: 1.5rem 0 0; color: var(--muted); font-size: 1.0625rem; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 0.75rem; margin-top: 1.75rem; }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 3.25rem;
  max-width: 100%;
  padding: 0.65rem 1.25rem;
  border: 1px solid transparent;
  border-radius: 0.875rem;
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.75;
  text-align: center;
  transition: background-color 150ms ease, border-color 150ms ease;
}

.btn-primary { background: var(--green); color: #fff; }
.btn-primary:hover { background: var(--green-hover); }
.btn-secondary { background: #161a17; border-color: var(--border); }
.btn-secondary:hover { background: #232a25; border-color: #526456; }
.hero-tags { display: flex; flex-wrap: wrap; gap: 0.5rem; margin: 1.5rem 0 0; padding: 0; list-style: none; }
.hero-tags a { padding: 0.25rem 0.75rem; border: 1px solid var(--border); border-radius: 2rem; color: var(--muted); font-size: 0.875rem; }

.screen-card {
  width: 100%;
  margin: 0;
  padding: clamp(0.5rem, 1.2vw, 1rem);
  border: 1px solid var(--border);
  border-radius: clamp(1rem, 2vw, 1.5rem);
  background: var(--card);
  box-shadow: 0 18px 48px rgb(0 0 0 / 25%);
}

.screen-top { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 0.5rem 1rem; margin-bottom: 0.75rem; }
.screen-badge { padding: 0.25rem 0.75rem; border: 1px solid var(--border); border-radius: 2rem; font-size: 0.875rem; font-weight: 700; }
.screen-meta { display: flex; flex-direction: column; text-align: end; }
.screen-meta strong { font-size: clamp(1rem, 1.8vw, 1.35rem); }
.screen-meta span { color: var(--muted); font-size: 0.875rem; }
.screen-image { width: 100%; height: auto; border-radius: 0.75rem; }

.about { padding-block: 1rem; }
.about-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 2fr);
  align-items: center;
  gap: 1rem 2rem;
  padding-block: clamp(1.25rem, 3vw, 2rem);
  border-block: 1px solid var(--border);
}

h2 { margin: 0; font-size: clamp(1.5rem, 2.6vw, 2.25rem); line-height: 1.6; }
.about p { margin: 0; color: var(--muted); }
.versions { padding-block: clamp(2rem, 5vw, 4rem) 1rem; }
.section-heading { max-width: 45rem; margin: 0 auto 1.75rem; text-align: center; }
.section-heading > p:last-child { margin: 0.75rem 0 0; color: var(--muted); }
.version-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; }
.version-card {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  min-width: 0;
  padding: clamp(1.25rem, 2.5vw, 2rem);
  border: 1px solid var(--border);
  border-radius: 1.25rem;
  background: var(--card);
}

.version-card:target { border-color: #7bd994; }
.version-icon { display: inline-flex; align-items: center; justify-content: center; min-width: 3.25rem; min-height: 3.25rem; padding: 0.5rem; margin-bottom: 0.75rem; border: 1px solid #34463a; border-radius: 0.875rem; background: #19281e; color: #c0e5c9; font-weight: 700; }
.version-card h3 { margin: 0 0 0.5rem; font-size: 1.25rem; line-height: 1.6; }
.version-card p { margin: 0 0 1.25rem; color: var(--muted); }
.version-card .btn { margin-top: auto; }
.faq-section {
  padding-block: clamp(2rem, 5vw, 4rem) 1rem;
}

.faq-list {
  display: grid;
  gap: 0.75rem;
  max-width: 52rem;
  margin-inline: auto;
}

.faq-item {
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: 1rem;
  background: var(--card);
}

.faq-item[open] {
  border-color: #395a43;
}

.faq-item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 1.25rem;
  font-weight: 700;
  cursor: pointer;
  list-style: none;
}

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

.faq-item summary::after {
  content: "+";
  flex: 0 0 auto;
  color: var(--muted);
  font-size: 1.25rem;
  line-height: 1;
  transition: transform 150ms ease;
}

.faq-item[open] summary::after {
  transform: rotate(45deg);
}

.faq-item summary:hover {
  background: #161a17;
}

.faq-item p {
  margin: 0;
  padding: 0 1.25rem 1.25rem;
  color: var(--muted);
}
.cta-section { padding-block: 1.75rem clamp(2rem, 5vw, 4rem); }
.cta-box { padding: clamp(1.5rem, 4vw, 3rem); border: 1px solid #34483a; border-radius: 1.5rem; background: #111a14; text-align: center; }
.cta-box p { max-width: 40rem; margin: 0.75rem auto 1.5rem; color: var(--muted); }
.site-footer { border-top: 1px solid var(--border); padding-block: 1.25rem; }
.footer-inner { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 0.5rem 1rem; }
.footer-inner p { margin: 0; }
.footer-inner span { color: var(--muted); }
.footer-inner a { display: inline-flex; align-items: center; min-height: 2.75rem; color: var(--muted); text-decoration: underline; text-underline-offset: 0.25em; }
.footer-inner a:hover { color: var(--text); }

@media (max-width: 56.25rem) {
  .site-header { position: static; }
  .site-header.navigation-ready { position: sticky; }
  .header-inner { flex-wrap: wrap; min-height: 4.75rem; }
  .navigation-ready .menu-toggle { display: inline-flex; }
  .site-nav { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); width: 100%; gap: 0.5rem; }
  .site-nav a { border-color: var(--border); }
  .navigation-ready .site-nav {
    position: absolute;
    inset-block-start: 100%;
    inset-inline: 0;
    width: auto;
    padding: 0.75rem max(0.75rem, 2vw);
    max-height: calc(100vh - var(--header-height));
    max-height: calc(100dvh - var(--header-height));
    overflow-y: auto;
    overscroll-behavior: contain;
    background: #0b0d0c;
    border-bottom: 1px solid var(--border);
    box-shadow: 0 12px 24px rgb(0 0 0 / 25%);
  }
  .hero-grid { grid-template-columns: minmax(0, 1fr); gap: 1.75rem; }
  .hero-content { text-align: center; }
  .hero h1 { max-width: 42rem; margin-inline: auto; font-size: clamp(2rem, 5.5vw, 3rem); }
  .hero-text { max-width: 42rem; margin-inline: auto; }
  .hero-actions, .hero-tags { justify-content: center; }
  .about-inner { grid-template-columns: minmax(0, 1fr); gap: 0.5rem; }
}

@media (max-width: 40rem) {

  /* Header جمع‌وجورتر */

  .header-inner {
    min-height: 4.25rem;
    padding-block: 0.55rem;
  }

  .brand-logo {
    width: 2.75rem;
    height: 2.75rem;
    border-radius: 0.65rem;
  }

  .brand-text strong {
    font-size: 1.3rem;
  }

  .brand-text span {
    font-size: 0.8rem;
  }


  /* Hamburger کوچک‌تر */

  .menu-toggle {
    flex-basis: 2.625rem;
    width: 2.625rem;
    height: 2.625rem;
    border-radius: 0.7rem;
  }

  .menu-toggle span {
    width: 18px;
  }


  /* فاصله عمودی Hero و بخش‌ها کمتر */

  .hero {
    padding-block: 1.5rem 2rem;
  }

  .about {
    padding-block: 0.5rem;
  }

  .about-inner {
    padding-block: 1rem;
  }

  .versions {
    padding-block: 1.5rem 0.75rem;
  }

  .section-heading {
    margin-bottom: 1.25rem;
  }

  .faq-section {
    padding-block: 1.25rem 0.75rem;
  }

  .faq-item summary {
    padding: 0.9rem 1rem;
  }

  .faq-item p {
    padding: 0 1rem 1rem;
  }

  .cta-section {
    padding-block: 1.25rem 1.75rem;
  }

  .cta-box {
    padding: 1.5rem 1rem;
  }


  /* کارت‌های نسخه حدود 10 تا 15 درصد فشرده‌تر */

  .version-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .version-card {
    padding: 1.0625rem;
    border-radius: 1.1rem;
  }

  .version-icon {
    min-width: 3rem;
    min-height: 3rem;
    margin-bottom: 0.6rem;
  }

  .version-card p {
    margin-bottom: 1rem;
  }


  /* تنظیمات قبلی موبایل */

  .hero-actions {
    flex-direction: column;
  }

  .btn {
    width: 100%;
  }

  .hero-text {
    font-size: 1rem;
  }

  .footer-inner {
    flex-direction: column;
    text-align: center;
  }

}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .btn { transition: none; }
}