:root{
    --bg:#faf9f6;
    --card:#ffffff;
    --border:#e5e2da;
    --text:#2c2c2a;
    --text-secondary:#6b6a64;
    --accent:#0c447c;
    --accent-bg:rgba(12,68,124,0.10);
    --title-color:#0c447c;
    --panel-bg:rgba(255,255,255,0.66);
    --btn-bg:rgba(255,255,255,0.60);
    --overlay-color:rgba(250,249,246,0.62);
    --bg-image:url('/assets/background-day.webp');
    --dark-bg:#151719;
    --dark-card:#202326;
    --dark-border:#3b3f43;
    --dark-text:#ececec;
    --dark-text-secondary:#b5b8bb;
    --dark-accent:#3ddc84;
    --dark-accent-bg:rgba(61,220,132,0.18);
    --dark-title-color:#e3bb63;
    --dark-panel-bg:rgba(15,17,19,0.56);
    --dark-btn-bg:rgba(15,17,19,0.55);
    --dark-overlay-color:rgba(6,8,10,0.46);
    --dark-bg-image:url('/assets/background-evening.webp');
  }
  *{box-sizing:border-box;}
  body{
    margin:0;
    min-height:100vh;
    transition:background-color .2s ease, color .2s ease;
    background-color:var(--bg);
    background-image:linear-gradient(var(--overlay-color), var(--overlay-color)), var(--bg-image);
    background-size:cover;
    background-position:center;
    background-attachment:fixed;
    background-repeat:no-repeat;
    color:var(--text);
    font-family:"Vazirmatn", Tahoma, sans-serif;
  }
  html[data-theme="dark"]{
    --bg:var(--dark-bg);
    --card:var(--dark-card);
    --border:var(--dark-border);
    --text:var(--dark-text);
    --text-secondary:var(--dark-text-secondary);
    --accent:var(--dark-accent);
    --accent-bg:var(--dark-accent-bg);
    --title-color:var(--dark-title-color);
    --panel-bg:var(--dark-panel-bg);
    --btn-bg:var(--dark-btn-bg);
    --overlay-color:var(--dark-overlay-color);
    --bg-image:var(--dark-bg-image);
  }

  /* ---- language / theme controls ---- */
  [hidden]{display:none !important;}
  .site-actions{
    position:static;
    display:flex;
    align-items:center;
    gap:8px;
  }
  .site-action{
    display:inline-flex;
    align-items:center;
    justify-content:center;
    min-width:42px;
    height:34px;
    padding:0 10px;
    border:1px solid var(--border);
    border-radius:9px;
    background:var(--btn-bg);
    -webkit-backdrop-filter:blur(8px);
    backdrop-filter:blur(8px);
    color:var(--text);
    font-family:inherit;
    font-size:13px;
    text-decoration:none;
    cursor:pointer;
    transition:background .15s ease, border-color .15s ease;
  }
  .site-action:hover{
    background:var(--accent-bg);
    border-color:var(--accent);
  }
  .theme-icon{
    font-size:18px;
    line-height:1;
  }
  .site-header{
    position:relative;
    text-align:center;
    padding:3rem 0.625rem 2rem;
    border-bottom:1px solid var(--border);
    background:transparent;
  }
  .site-header h1{
    margin:0;
    font-size:clamp(32px, 5vw, 48px);
    font-weight:700;
    color:var(--title-color);
    letter-spacing:0.01em;
    text-shadow:0 2px 14px rgba(0,0,0,0.28);
  }
  .site-header p{
    margin:10px 0 0;
    color:var(--text-secondary);
    font-size:14px;
  }
  .site-header .site-status{
    margin:6px 0 0;
    color:var(--accent);
    font-size:13px;
    font-weight:600;
  }

  .page{
    max-width:1300px;
    margin:0 auto;
    padding:2rem 0.625rem 4rem;
    display:grid;
    grid-template-columns: 300px 1fr;
    gap: 2rem;
    align-items:start;
  }
  .main-col{
    min-width:0;
    order:2;
    background:var(--panel-bg);
    border:1px solid var(--border);
    border-radius:14px;
    padding:1.75rem 1.75rem 2rem;
    -webkit-backdrop-filter:blur(16px) saturate(140%);
    backdrop-filter:blur(16px) saturate(140%);
    box-shadow:0 8px 30px rgba(0,0,0,0.18), inset 0 1px 0 rgba(255,255,255,0.06);
  }
  aside.toc{ order:1; }

  .site-nav-links{
    position:absolute;
    top:18px;
    left:18px;
    display:flex;
    align-items:center;
    flex-wrap:wrap;
    gap:8px;
    z-index:10;
    direction:ltr;
  }
  .site-nav-actions{
    position:absolute;
    top:18px;
    right:18px;
    display:flex;
    align-items:center;
    flex-wrap:wrap;
    gap:8px;
    z-index:10;
    direction:ltr;
  }
  .site-nav-links a, .site-nav-actions .site-action{
    display:inline-flex;
    align-items:center;
    justify-content:center;
    min-width:42px;
    height:34px;
    padding:0 12px;
    border:1px solid var(--border);
    border-radius:9px;
    background:var(--btn-bg);
    -webkit-backdrop-filter:blur(8px);
    backdrop-filter:blur(8px);
    color:var(--text);
    font-family:inherit;
    font-size:13px;
    text-decoration:none;
    cursor:pointer;
    transition:background .15s ease, border-color .15s ease;
  }
  .site-nav-links a:hover, .site-nav-actions .site-action:hover{
    background:var(--accent-bg);
    border-color:var(--accent);
  }
  .home-page, .about-page{
    max-width:1300px;
    margin:2rem auto 3rem;
    padding:2.5rem 1.5rem 3rem;
    text-align:center;
    background:var(--panel-bg);
    border:1px solid var(--border);
    border-radius:14px;
    -webkit-backdrop-filter:blur(16px) saturate(140%);
    backdrop-filter:blur(16px) saturate(140%);
    box-shadow:0 8px 30px rgba(0,0,0,0.18), inset 0 1px 0 rgba(255,255,255,0.06);
  }
  .home-page h2, .about-page h2{
    color:var(--accent);
    font-size:24px;
    margin:0 0 1.25rem;
  }
  .home-page p, .about-page p{
    color:var(--text);
    font-size:16px;
    line-height:2;
    text-align:justify;
    margin:0 auto 1.5rem;
  }
  .platform-links{
    display:flex;
    flex-direction:column;
    align-items:center;
    gap:10px;
    margin-top:1.5rem;
  }
  .platform-row{
    display:flex;
    justify-content:center;
    align-items:center;
    flex-wrap:wrap;
    gap:10px;
    width:100%;
  }
  .platform-link{
    display:inline-flex;
    align-items:center;
    justify-content:center;
    gap:8px;
    min-width:132px;
    padding:8px 14px;
    border:1px solid var(--border);
    border-radius:20px;
    background:var(--btn-bg);
    -webkit-backdrop-filter:blur(6px);
    backdrop-filter:blur(6px);
    color:var(--text);
    text-decoration:none;
    font-size:13px;
    font-weight:600;
    transition:background .15s ease, border-color .15s ease, transform .15s ease;
  }
  .platform-link:hover{
    background:var(--accent-bg);
    border-color:var(--accent);
    transform:translateY(-1px);
  }
  .platform-logo{
    width:24px;
    height:24px;
    flex:0 0 24px;
    display:block;
  }
  .platform-link.visual .platform-logo{ width:26px; height:26px; flex-basis:26px; }
  .main-col .topbar{ display:none; }

  header.article-head{
    border-bottom:1px solid var(--border);
    padding-bottom:1.25rem;
    margin-bottom:1.5rem;
  }
  h1.article-title{
    font-size:24px;
    font-weight:700;
    margin:0 0 8px;
  }
  .meta{
    display:none;
  }
  .view-counter{
    display:inline-flex;
    align-items:center;
    gap:6px;
    margin-top:12px;
    padding:6px 16px;
    border:1px solid var(--accent);
    border-radius:999px;
    background:var(--accent-bg);
    -webkit-backdrop-filter:blur(6px);
    backdrop-filter:blur(6px);
    color:var(--accent);
    font-size:13px;
    font-weight:600;
    min-height:18px;
  }
  .view-counter .view-icon{
    font-size:10px;
    line-height:1;
  }
  html[data-lang="en"] .view-counter{
    direction:ltr;
  }

  .embed-block{ margin-bottom:1.75rem; }
  .embed-block iframe{
    width:100%;
    border:none;
    border-radius:12px;
    display:block;
  }
  .podcast-block iframe{ height:150px; }
  .video-block iframe{ aspect-ratio:16/9; height:auto; }
  .embed-label{
    font-size:12px;
    color:var(--text-secondary);
    margin:0 0 8px;
    text-align:center;
  }

article{
  text-align:justify;
  font-size:15px;
  line-height:2;
}
  article p{ margin:0 0 1.1rem; }
  article h2{
    font-size:18px;
    font-weight:700;
    color:var(--accent);
    margin:2rem 0 1rem;
  }
article blockquote{
  margin:0 0 1.5rem;
  padding:1rem 1.25rem;
  border:2px solid var(--accent);
  background:var(--accent-bg);
  border-radius:8px;
  text-align:justify;
}
  article blockquote p{ margin:0 0 1rem; }
  article blockquote p:last-child{ margin-bottom:0; }
  html[data-lang="en"] body{
    font-family:Arial, Helvetica, sans-serif;
  }
  html[data-lang="en"] .site-header,
  html[data-lang="en"] .page{
    direction:ltr;
  }
  html[data-lang="en"] .main-col{ order:2; }
  /* Explicit, browser-independent text direction for the article index. */
  html[data-lang="fa"] aside.toc{ order:1; }
  html[data-lang="fa"] aside.toc .toc-scroll{ direction:ltr; }
  html[data-lang="fa"] aside.toc .toc-title,
  html[data-lang="fa"] aside.toc ul,
  html[data-lang="fa"] aside.toc a{
    direction:rtl;
    text-align:right;
    unicode-bidi:plaintext;
  }
  html[data-lang="en"] aside.toc{ order:1; }
  html[data-lang="en"] aside.toc .toc-scroll{ direction:rtl; }
  html[data-lang="en"] aside.toc .toc-title,
  html[data-lang="en"] aside.toc ul,
  html[data-lang="en"] aside.toc a{
    direction:ltr;
    text-align:left;
    unicode-bidi:plaintext;
  }
  html[data-lang="en"] article{ direction:ltr; text-align:justify; }
  html[data-lang="en"] article blockquote{ direction:ltr; text-align:justify; }
  html[data-lang="en"] .footer-title{ direction:ltr; }

  /* sidebar / TOC */
  aside.toc{
    background:var(--panel-bg);
    border:1px solid var(--border);
    border-radius:12px;
    padding:14px;
    position:sticky;
    top:1.5rem;
    overflow:hidden;
    direction:rtl;
    text-align:right;
    -webkit-backdrop-filter:blur(16px) saturate(140%);
    backdrop-filter:blur(16px) saturate(140%);
    box-shadow:0 8px 30px rgba(0,0,0,0.18), inset 0 1px 0 rgba(255,255,255,0.06);
  }
  /* Keep scrollbar direction independent from text direction.
     This gives Firefox and Chromium the same scrollbar side. */
  aside.toc .toc-scroll{
    max-height:90vh;
    overflow-y:auto;
    overflow-x:hidden;
    direction:ltr;
  }
  aside.toc .toc-title{
    font-size:12px;
    color:var(--text-secondary);
    margin:0 0 10px;
    font-weight:600;
    direction:rtl;
    text-align:right;
    unicode-bidi:plaintext;
  }
  aside.toc ul{ list-style:none; margin:0; padding:0; }
  aside.toc li{ margin:0 0 2px; }
  aside.toc a{
    display:block;
    width:100%;
    box-sizing:border-box;
    padding:6px 8px;
    border-radius:6px;
    font-size:13px;
    color:var(--text);
    text-decoration:none;
    line-height:1.5;
    cursor:pointer;
    direction:rtl;
    text-align:right;
    unicode-bidi:plaintext;
  }
  aside.toc a:hover{ background:var(--accent-bg); }
  aside.toc a.current{
    font-weight:700;
    background:var(--accent-bg);
    color:var(--accent);
  }
  aside.toc a.placeholder{
    color:var(--text-secondary);
    font-style:italic;
    cursor:default;
  }
  aside.toc a.placeholder:hover{ background:none; }

  footer.persistent{
    margin-top:2.5rem;
    padding-top:1.25rem;
    border-top:1px solid var(--border);
  }
  .footer-title{
    font-size:12px;
    color:var(--text-secondary);
    margin:0 0 10px;
    text-align:center;
  }
  .footer-links{
    display:flex;
    flex-direction:column;
    align-items:center;
    gap:10px;
    margin-bottom:1.25rem;
  }
  .footer-links .platform-links{ width:100%; margin-top:0; }
  .footer-links .platform-row{ width:100%; }
  .footer-links .platform-link{ min-width:132px; }
  .footer-bottom{
    display:flex;
    justify-content:center;
    align-items:center;
    flex-wrap:wrap;
    gap:8px;
    text-align:center;
  }
  .footer-bottom a{
    font-size:13px;
    color:var(--accent);
    text-decoration:none;
  }
  .footer-legal{
    margin-top:12px;
    padding-top:10px;
    border-top:1px solid var(--border);
    display:flex;
    justify-content:center;
    align-items:center;
    flex-wrap:wrap;
    gap:7px;
    text-align:center;
    color:var(--text-secondary);
    font-size:11px;
    line-height:1.8;
  }

  @media (max-width: 720px){
    .site-nav-links{ top:12px; left:12px; }
    .site-nav-actions{ top:12px; right:12px; }
    .site-nav-actions .site-action{ min-width:38px; height:32px; padding:0 8px; }
    .site-nav-links a{ min-width:38px; height:32px; padding:0 9px; }
    .page{ grid-template-columns: 1fr !important; }
    .main-col{ order:1; }
    aside.toc{ order:2; position:static; max-height:none; }
  }


/* ---------- Lightweight page-reveal effects ---------- */
html{scroll-behavior:smooth;}
body{
  position:relative;
  isolation:isolate;
  overflow-x:hidden;
  background-image:none;
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:-1;
  pointer-events:none;
  background-color:var(--bg);
  background-image:linear-gradient(var(--overlay-color), var(--overlay-color)), var(--bg-image);
  background-size:cover;
  background-position:center;
  background-repeat:no-repeat;
  background-attachment:fixed;
  transform:scale(1.015);
  animation:revelation-bg-in .9s cubic-bezier(.22,1,.36,1) both;
}
.site-header{
  animation:none !important;
}
.home-page,
.about-page,
.main-col,
aside.toc{
  animation:revelation-content-in .7s cubic-bezier(.22,1,.36,1) .08s both;
}
.home-page .platform-link,
.about-page .platform-link{
  opacity:1;
  animation:revelation-link-in .5s cubic-bezier(.22,1,.36,1) both;
}
.home-page .platform-row:nth-child(1) .platform-link:nth-child(1),
.about-page .platform-row:nth-child(1) .platform-link:nth-child(1){animation-delay:.18s;}
.home-page .platform-row:nth-child(1) .platform-link:nth-child(2),
.about-page .platform-row:nth-child(1) .platform-link:nth-child(2){animation-delay:.25s;}
.home-page .platform-row:nth-child(1) .platform-link:nth-child(3),
.about-page .platform-row:nth-child(1) .platform-link:nth-child(3){animation-delay:.32s;}
.home-page .platform-row:nth-child(2) .platform-link:nth-child(1),
.about-page .platform-row:nth-child(2) .platform-link:nth-child(1){animation-delay:.39s;}
.home-page .platform-row:nth-child(2) .platform-link:nth-child(2),
.about-page .platform-row:nth-child(2) .platform-link:nth-child(2){animation-delay:.46s;}
.home-page .platform-row:nth-child(2) .platform-link:nth-child(3),
.about-page .platform-row:nth-child(2) .platform-link:nth-child(3){animation-delay:.53s;}
.home-page .platform-row:nth-child(2) .platform-link:nth-child(4),
.about-page .platform-row:nth-child(2) .platform-link:nth-child(4){animation-delay:.60s;}
@keyframes revelation-bg-in{
  from{opacity:0;transform:scale(1.04);}
  to{opacity:1;transform:scale(1.015);}
}
@keyframes revelation-content-in{
  from{transform:translateY(16px);}
  to{transform:translateY(0);}
}
@keyframes revelation-link-in{
  from{transform:translateY(8px) scale(.985);}
  to{transform:translateY(0) scale(1);}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  body::before,
  .site-header,
  .home-page,
  .about-page,
  .main-col,
  aside.toc,
  .home-page .platform-link,
  .about-page .platform-link{
    animation:none !important;
    opacity:1 !important;
    transform:none !important;
  }
}

/* Package 23 reliability fixes */
.site-nav-links,.site-nav-actions{z-index:1000;}
.site-nav-links a,.site-nav-actions .site-action{position:relative;z-index:1001;}
.platform-logo{width:24px;height:24px;flex:0 0 24px;display:block;overflow:visible;}