/* =========================================================
   Base & Reset
   ========================================================= */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --color-bg:          #f9f9f7;
  --color-surface:     #ffffff;
  --color-border:      #e5e5e0;
  --color-text:        #1a1a1a;
  --color-text-muted:  #6b7280;
  --color-accent:      #2563eb;
  --color-accent-dark: #1d4ed8;
  --color-tag-bg:      #eff6ff;
  --color-tag-text:    #1d4ed8;

  --font-sans: "Vazirmatn", "Tahoma", "Arial", sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;

  --width-content: 720px;
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.75rem;
  --space-xl: 3rem;
  --radius-lg: 22px;
  --shadow-soft: 0 16px 40px rgba(15, 23, 42, 0.06);
  --glass-bg: rgba(255, 255, 255, 0.72);
  --glass-border: rgba(255, 255, 255, 0.55);
  --shadow-glass: 0 18px 42px rgba(15, 23, 42, 0.1);
  --code-inline-bg: #eef2ff;
  --code-inline-text: #3730a3;
  --header-bg: rgba(255, 255, 255, 0.78);
  --header-border: rgba(255, 255, 255, 0.58);
  --footer-bg: rgba(255, 255, 255, 0.78);
  --footer-border: rgba(255, 255, 255, 0.6);
  --nav-hover-bg: rgba(255, 255, 255, 0.7);
  --nav-active-bg: rgba(255, 255, 255, 0.85);
  --hero-bg: linear-gradient(135deg, rgba(255, 255, 255, 0.86) 0%, rgba(255, 255, 255, 0.7) 100%);
}

html[data-theme="dark"] {
  --color-bg: #0b1220;
  --color-surface: #111827;
  --color-border: #334155;
  --color-text: #e5e7eb;
  --color-text-muted: #94a3b8;
  --color-accent: #60a5fa;
  --color-accent-dark: #3b82f6;
  --color-tag-bg: rgba(30, 64, 175, 0.35);
  --color-tag-text: #bfdbfe;
  --glass-bg: rgba(15, 23, 42, 0.62);
  --glass-border: rgba(100, 116, 139, 0.38);
  --shadow-glass: 0 18px 42px rgba(2, 6, 23, 0.45);
  --code-inline-bg: rgba(30, 41, 59, 0.92);
  --code-inline-text: #c7d2fe;
  --header-bg: rgba(15, 23, 42, 0.82);
  --header-border: rgba(100, 116, 139, 0.35);
  --footer-bg: rgba(15, 23, 42, 0.8);
  --footer-border: rgba(100, 116, 139, 0.3);
  --nav-hover-bg: rgba(30, 41, 59, 0.8);
  --nav-active-bg: rgba(30, 41, 59, 0.95);
  --hero-bg: linear-gradient(135deg, rgba(15, 23, 42, 0.9) 0%, rgba(17, 24, 39, 0.76) 100%);
}

html {
  font-size: 17px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background:
    radial-gradient(circle at 85% 0%, rgba(37, 99, 235, 0.13), transparent 30%),
    radial-gradient(circle at 10% 100%, rgba(124, 58, 237, 0.12), transparent 28%),
    radial-gradient(circle at 40% 35%, rgba(37, 99, 235, 0.06), transparent 34%),
    var(--color-bg);
  color: var(--color-text);
  line-height: 1.9;
  direction: rtl;
  text-align: right;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

/* =========================================================
   Layout helpers
   ========================================================= */
.container {
  max-width: var(--width-content);
  margin-inline: auto;
  padding-inline: var(--space-lg);
}

/* =========================================================
   Header & Navigation
   ========================================================= */
.site-header {
  background-color: var(--header-bg);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--header-border);
  padding-block: var(--space-md);
  position: sticky;
  top: 0;
  z-index: 10;
  box-shadow: 0 10px 26px rgba(15, 23, 42, 0.06);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.site-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-text);
  text-decoration: none;
}

.site-title:hover {
  color: var(--color-accent);
}

.site-nav ul {
  list-style: none;
  display: flex;
  gap: var(--space-lg);
}

.site-nav a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 36px;
  padding-inline: 0.6rem;
  border-radius: 999px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color 0.2s ease, background-color 0.2s ease, transform 0.2s ease;
}

.site-nav a:hover {
  color: var(--color-accent);
  background-color: var(--nav-hover-bg);
  transform: translateY(-1px);
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  min-height: 36px;
  border-radius: 999px;
  border: 1px solid var(--glass-border);
  background: var(--glass-bg);
  color: var(--color-text-muted);
  font-family: var(--font-sans);
  font-size: 0.82rem;
  font-weight: 600;
  padding: 0.35rem 0.7rem;
  cursor: pointer;
  transition: color 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

.theme-toggle:hover {
  color: var(--color-accent);
  border-color: rgba(37, 99, 235, 0.35);
  transform: translateY(-1px);
}

.theme-toggle:focus-visible {
  outline: 2px solid rgba(37, 99, 235, 0.45);
  outline-offset: 2px;
}

.theme-toggle-icon {
  line-height: 1;
  font-size: 0.95rem;
}

/* =========================================================
   Main content
   ========================================================= */
.site-main {
  padding-block: var(--space-xl);
}

/* =========================================================
   Hero / intro
   ========================================================= */
.hero {
  margin-bottom: var(--space-xl);
  padding: 2.1rem;
  border: 1px solid var(--glass-border);
  border-radius: 28px;
  background: var(--hero-bg);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: var(--shadow-glass);
}

.hero h1 {
  font-size: 1.85rem;
  font-weight: 800;
  line-height: 1.45;
  margin-bottom: var(--space-md);
}

.hero p {
  font-size: 1.05rem;
  color: var(--color-text-muted);
  max-width: 55ch;
}

/* =========================================================
   Post list
   ========================================================= */
.post-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
}

/* =========================================================
   Post card
   ========================================================= */
.post-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: var(--shadow-glass);
  padding: 1.5rem;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.post-card:hover {
  transform: translateY(-5px);
  border-color: rgba(37, 99, 235, 0.3);
  box-shadow: 0 24px 46px rgba(15, 23, 42, 0.14);
}

.post-meta {
  display: flex;
  align-items: center;
  flex-direction: row-reverse;
  justify-content: flex-end;
  gap: var(--space-sm);
  margin-bottom: var(--space-sm);
}

.post-meta time {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.post-tag {
  font-size: 0.72rem;
  font-weight: 600;
  background-color: var(--color-tag-bg);
  color: var(--color-tag-text);
  padding: 2px 9px;
  border-radius: 999px;
  font-family: var(--font-mono);
  letter-spacing: 0;
  direction: ltr;
  unicode-bidi: embed;
}

.post-title {
  font-size: 1.3rem;
  font-weight: 700;
  line-height: 1.55;
  margin-bottom: var(--space-md);
}

.post-title a {
  color: var(--color-text);
  text-decoration: none;
  transition: color 0.15s ease;
}

.post-title a:hover {
  color: var(--color-accent);
}

.post-excerpt {
  color: var(--color-text-muted);
  margin-bottom: var(--space-md);
  max-width: 65ch;
}

.post-excerpt code {
  font-family: var(--font-mono);
  font-size: 0.83em;
  background-color: var(--code-inline-bg);
  color: var(--code-inline-text);
  padding: 1px 5px;
  border-radius: 3px;
  direction: ltr;
  unicode-bidi: embed;
}

.read-more {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-accent);
  text-decoration: none;
  transition: color 0.2s ease, transform 0.2s ease;
  display: inline-block;
}

.read-more:hover {
  color: var(--color-accent-dark);
  text-decoration: underline;
  transform: translateX(-2px);
}

.all-posts-link {
  margin-top: 2rem;
}

/* =========================================================
   LTR override for code/tech identifiers
   ========================================================= */
[dir="ltr"],
code, pre, kbd, samp {
  direction: ltr;
  unicode-bidi: embed;
}

/* =========================================================
   Footer
   ========================================================= */
.site-footer {
  background-color: var(--footer-bg);
  border-top: 1px solid var(--footer-border);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  padding-block: var(--space-lg);
  margin-top: var(--space-xl);
}

.site-footer p {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  text-align: center;
}

/* =========================================================
   Active nav link
   ========================================================= */
.site-nav a.nav-active {
  color: var(--color-accent);
  font-weight: 700;
  background-color: var(--nav-active-bg);
  box-shadow: inset 0 0 0 1px rgba(37, 99, 235, 0.2);
}

.site-nav a:focus-visible,
.read-more:focus-visible,
.theme-toggle:focus-visible {
  outline: 2px solid rgba(37, 99, 235, 0.45);
  outline-offset: 2px;
}

@media (max-width: 760px) {
  .hero {
    padding: 1.4rem;
    border-radius: 20px;
  }

  .post-card {
    border-radius: 18px;
    padding: 1.15rem;
  }
}

/* =========================================================
   Responsive
   ========================================================= */
@media (max-width: 600px) {
  html {
    font-size: 16px;
  }

  .container {
    padding-inline: var(--space-md);
  }

  .hero h1 {
    font-size: 1.45rem;
  }

  .post-title {
    font-size: 1.1rem;
  }

  .site-header .container {
    flex-wrap: wrap;
    justify-content: center;
  }

  .header-actions {
    width: 100%;
    justify-content: center;
    flex-wrap: wrap;
  }

  .site-nav ul {
    gap: var(--space-md);
    justify-content: center;
  }
}