/* ===== Design tokens ===== */
:root {
  --bg: #0a0c10;
  --bg-panel: #12151b;
  --bg-panel-2: #171b22;
  --text: #e7eaef;
  --text-dim: #8b93a1;
  --accent: #4fd1ff;
  --accent-2: #ffb020;
  --line: rgba(255, 255, 255, .08);
  --line-strong: rgba(255, 255, 255, .16);
  --radius: 14px;
  --font-display: 'Orbitron', 'Rajdhani', sans-serif;
  --font-body: 'Rajdhani', 'DM Sans', sans-serif;
  --font-mono: 'DM Mono', monospace;
  --ease: cubic-bezier(.16, .84, .44, 1);
  --header-h: 76px;
}

body.lang-fa {
  --font-display: 'Vazirmatn', 'Orbitron', sans-serif;
  --font-body: 'Vazirmatn', 'Rajdhani', sans-serif;
}

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

html {
  scroll-behavior: smooth
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto
  }

  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important
  }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none
}

img {
  max-width: 100%;
  display: block
}

button {
  font-family: inherit;
  cursor: pointer
}

::selection {
  background: var(--accent);
  color: #05070a
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px
}

.is-rtl {
  direction: rtl
}

.is-ltr {
  direction: ltr
}

.mono-tag {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--text-dim);
}

.eyebrow {
  margin: 0 0 14px;
  padding-inline-start: 26px;
  position: relative;
}

.eyebrow::before {
  content: "";
  position: absolute;
  inset-inline-start: 0;
  top: 50%;
  width: 18px;
  height: 1px;
  background: var(--accent);
  transform: translateY(-50%);
}

.section-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.9rem, 3.4vw, 3rem);
  line-height: 1.15;
  margin: 0 0 28px;
  max-width: 16ch;
}

.section-inner {
  max-width: 1180px;
  margin-inline: auto;
  padding: 110px 32px;
}

/* ===== Background veil ===== */
.grid-veil {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 80% 55% at 50% 0%, black 20%, transparent 75%);
  opacity: .5;
}

/* ===== Header ===== */
.site-header {
  position: fixed;
  inset-inline: 0;
  top: 0;
  z-index: 100;
  height: var(--header-h);
  display: flex;
  align-items: center;
  background: rgba(10, 12, 16, .55);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color .3s var(--ease), background .3s var(--ease);
}

.site-header.is-scrolled {
  border-bottom-color: var(--line);
  background: rgba(10, 12, 16, .85);
}

.site-header__inner {
  width: 100%;
  max-width: 1320px;
  margin-inline: auto;
  padding-inline: 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px
}

.brand__mark {
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  padding: 4px;
  background: rgba(255, 255, 255, .03);
}

.brand__mark img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
}

.brand__name {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase
}

.main-nav {
  display: flex;
  gap: 28px
}

.main-nav a {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: .9rem;
  color: var(--text-dim);
  transition: color .25s var(--ease);
}

.main-nav a:hover {
  color: var(--text)
}

.nav-tag {
  font-family: var(--font-mono);
  font-size: .68rem;
  color: var(--accent)
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 16px
}

.lang-switch__group {
  display: flex;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  overflow: hidden
}

.lang-btn {
  background: transparent;
  border: 0;
  color: var(--text-dim);
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .06em;
  padding: 7px 11px;
  transition: background .2s var(--ease), color .2s var(--ease);
}

.lang-btn+.lang-btn {
  border-inline-start: 1px solid var(--line-strong)
}

.lang-btn:hover {
  color: var(--text)
}

.lang-btn.is-active {
  background: var(--accent);
  color: #05070a
}

.nav-toggle {
  display: none;
  width: 38px;
  height: 38px;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  background: transparent;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 4px;
}

.nav-toggle span {
  width: 16px;
  height: 1px;
  background: var(--text)
}

@media (max-width: 880px) {
  .main-nav {
    position: fixed;
    inset-inline: 0;
    top: var(--header-h);
    flex-direction: column;
    background: rgba(10, 12, 16, .97);
    padding: 20px 32px 32px;
    border-bottom: 1px solid var(--line);
    transform: translateY(-8px);
    opacity: 0;
    visibility: hidden;
    transition: opacity .25s var(--ease), transform .25s var(--ease), visibility .25s;
  }

  .main-nav.is-open {
    opacity: 1;
    transform: translateY(0);
    visibility: visible
  }

  .main-nav a {
    padding: 12px 0;
    border-bottom: 1px solid var(--line)
  }

  .nav-toggle {
    display: flex
  }

  .brand__name {
    display: none
  }
}

/* ===== Buttons ===== */
.btn {
  font-family: var(--font-display);
  letter-spacing: .08em;
  text-transform: uppercase;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 26px;
  border-radius: 10px;
  font-size: .92rem;
  font-weight: 500;
  border: 1px solid transparent;
  transition: transform .25s var(--ease), background .25s var(--ease), border-color .25s var(--ease);
}

.btn--primary {
  background: var(--accent);
  color: #05070a
}

.btn--primary:hover {
  transform: translateY(-2px)
}

.btn--ghost {
  border-color: var(--line-strong);
  color: var(--text)
}

.btn--ghost:hover {
  border-color: var(--accent);
  color: var(--accent)
}

/* ===== Shared bits used across partials ===== */
.tool-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 14px
}

.tool-chip {
  font-family: var(--font-mono);
  font-size: .74rem;
  padding: 7px 12px;
  border: 1px solid var(--line-strong);
  border-radius: 100px;
  color: var(--text-dim);
}

.tool-chips--small .tool-chip {
  padding: 5px 10px;
  font-size: .68rem
}

.corner {
  position: absolute;
  width: 22px;
  height: 22px;
  border: 1px solid var(--accent);
  opacity: .6
}

.corner--tl {
  top: -1px;
  inset-inline-start: -1px;
  border-inline-end: 0;
  border-bottom: 0
}

.corner--tr {
  top: -1px;
  inset-inline-end: -1px;
  border-inline-start: 0;
  border-bottom: 0
}

.corner--bl {
  bottom: -1px;
  inset-inline-start: -1px;
  border-inline-end: 0;
  border-top: 0
}

.corner--br {
  bottom: -1px;
  inset-inline-end: -1px;
  border-inline-start: 0;
  border-top: 0
}

/* ===== Footer ===== */
.site-footer {
  border-top: 1px solid var(--line)
}

.site-footer__inner {
  max-width: 1180px;
  margin-inline: auto;
  padding: 26px 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.to-top {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  border: 1px solid var(--line-strong);
  background: transparent;
  color: var(--text);
}

.to-top:hover {
  border-color: var(--accent);
  color: var(--accent)
}