/* === CSS RESET & VARIABLES === */
:root {
  --color-bg: #0a0e1a;
  --color-text: #e8eaf0;
  --color-accent: #7eb8f7;
  --color-accent-gold: #f0c040;
  --color-border: #1a2a4a;
  --color-hover: #9ecef5;
  --max-width: 860px;
  --font-family: 'Tajawal', 'Cairo', 'Segoe UI', Arial, sans-serif;
  --line-height: 1.8;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-family);
  line-height: var(--line-height);
  font-size: 18px;
}

@media (max-width: 768px) {
  body {
    font-size: 16px;
  }
}

/* === TYPOGRAPHY === */
h1, h2, h3, h4, h5, h6 {
  margin: 1.5em 0 0.75em;
  font-weight: 700;
  line-height: 1.3;
}

h1 {
  font-size: 2.5em;
  margin-top: 0;
}

h2 {
  font-size: 1.8em;
  border-right: 4px solid var(--color-accent-gold);
  padding-right: 1rem;
}

h3 {
  font-size: 1.3em;
}

p {
  margin-bottom: 1.2em;
  text-align: justify;
}

a {
  color: var(--color-accent);
  text-decoration: underline;
  transition: color 0.3s ease;
}

a:hover {
  color: var(--color-hover);
}

strong {
  color: var(--color-accent);
  font-weight: 600;
}

em {
  font-style: italic;
}

/* === LAYOUT === */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* === HEADER === */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(10, 14, 26, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
}

.site-header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.5rem;
}

.site-logo {
  font-size: 1.5em;
  font-weight: 700;
  color: var(--color-accent-gold);
  text-decoration: none;
  transition: color 0.3s ease;
}

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

.site-nav ul {
  display: flex;
  list-style: none;
  gap: 2rem;
  flex-direction: row-reverse;
}

.site-nav a {
  color: var(--color-text);
  text-decoration: none;
  transition: color 0.3s ease;
}

.site-nav a:hover {
  color: var(--color-accent-gold);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--color-accent-gold);
  font-size: 1.5em;
  cursor: pointer;
}

@media (max-width: 768px) {
  .nav-toggle {
    display: block;
  }
  
  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-top: 1px solid var(--color-border);
    display: none;
    flex-direction: column;
  }
  
  .site-nav.active {
    display: flex;
  }
  
  .site-nav ul {
    flex-direction: column;
    gap: 0;
  }
  
  .site-nav li {
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--color-border);
  }
  
  .site-header .container {
    flex-wrap: wrap;
  }
}

/* === FOOTER === */
.site-footer {
  background: rgba(10, 14, 26, 0.98);
  border-top: 1px solid var(--color-border);
  margin-top: 3rem;
  padding: 2rem 0;
  text-align: center;
}

.site-footer a {
  color: var(--color-accent);
}

.footer-tagline {
  font-weight: 600;
  margin-bottom: 0.5em;
}

.footer-links {
  margin-bottom: 1em;
  font-size: 0.95em;
}

.footer-copy {
  font-size: 0.85em;
  color: #999;
}

/* === MAIN CONTENT === */
main {
  min-height: calc(100vh - 200px);
  padding: 2rem 0;
}

.post-article {
  margin: 0 auto;
  max-width: var(--max-width);
  padding: 0 1.5rem;
}

/* === HERO PLACEHOLDER === */
.hero-placeholder {
  width: 100%;
  height: 420px;
  background: linear-gradient(135deg, #1a1f3a 0%, #0d1b2a 100%);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 2rem 0;
  position: relative;
  overflow: hidden;
  border: 1px solid var(--color-border);
}

.hero-placeholder::before {
  content: '';
  position: absolute;
  inset: 0;
  animation: starfield 20s linear infinite;
  background-image:
    radial-gradient(2px 2px at 20px 30px, #eee, rgba(255,255,255,0)),
    radial-gradient(2px 2px at 60px 70px, #fff, rgba(255,255,255,0)),
    radial-gradient(1px 1px at 50px 50px, #fff, rgba(255,255,255,0)),
    radial-gradient(1px 1px at 130px 80px, #fff, rgba(255,255,255,0)),
    radial-gradient(2px 2px at 90px 10px, #fff, rgba(255,255,255,0));
  background-repeat: repeat;
  background-size: 200px 200px;
  opacity: 0.5;
}

@keyframes starfield {
  from {
    transform: translateY(0);
  }
  to {
    transform: translateY(-200px);
  }
}

.hero-placeholder-text {
  position: relative;
  z-index: 1;
  color: var(--color-accent);
  font-size: 1.3em;
  font-weight: 600;
  text-align: center;
}

/* === POST HEADER === */
.post-header {
  margin: 2rem 0 1.5rem 0;
}

.post-meta {
  display: flex;
  gap: 1rem;
  align-items: center;
  margin-bottom: 1rem;
  flex-direction: row-reverse;
}

.post-category {
  display: inline-block;
  background: var(--color-accent);
  color: var(--color-bg);
  padding: 0.4em 0.8em;
  border-radius: 4px;
  font-size: 0.85em;
  font-weight: 600;
}

time {
  color: #aaa;
  font-size: 0.95em;
}

.post-excerpt {
  font-size: 1.1em;
  color: #bbb;
  font-style: italic;
  margin-top: 1rem;
}

/* === BREADCRUMB === */
.breadcrumb {
  display: flex;
  gap: 0.5rem;
  flex-direction: row-reverse;
  margin: 1rem 0;
  font-size: 0.9em;
}

.breadcrumb a {
  text-decoration: none;
}

/* === TABLE OF CONTENTS === */
.toc {
  background: rgba(126, 184, 247, 0.05);
  border: 2px solid var(--color-accent-gold);
  border-radius: 8px;
  padding: 1.5rem;
  margin: 2rem 0;
  float: right;
  width: 280px;
  margin-left: 2rem;
}

.toc-title {
  font-size: 1.1em;
  margin-top: 0;
  margin-bottom: 1rem;
  color: var(--color-accent-gold);
}

.toc ol {
  list-style: none;
}

.toc li {
  margin: 0.5rem 0;
}

.toc a {
  color: var(--color-accent);
  text-decoration: none;
  font-size: 0.95em;
}

.toc a:hover {
  color: var(--color-hover);
  text-decoration: underline;
}

.toc a.active {
  color: var(--color-accent-gold);
  font-weight: 600;
}

@media (max-width: 1024px) {
  .toc {
    width: 100%;
    float: none;
    margin-left: 0;
    margin-right: 0;
  }
}

@media (max-width: 768px) {
  .toc {
    display: none;
  }
}

/* === POST CONTENT === */
.post-content {
  clear: both;
}

.post-content section {
  margin-bottom: 2rem;
}

.post-content section + section {
  margin-top: 3rem;
}

/* === TABLES === */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  background: rgba(126, 184, 247, 0.03);
}

thead {
  background: rgba(126, 184, 247, 0.1);
}

th, td {
  padding: 1rem;
  text-align: right;
  border: 1px solid var(--color-border);
}

th {
  background: var(--color-accent);
  color: var(--color-bg);
  font-weight: 600;
}

tbody tr:nth-child(even) {
  background: rgba(126, 184, 247, 0.02);
}

/* === CALLOUT BOXES === */
.callout-tip,
.callout-fact,
.callout-warning {
  padding: 1.5rem;
  border-radius: 8px;
  margin: 1.5rem 0;
  border-right: 4px solid;
  background: rgba(126, 184, 247, 0.08);
  backdrop-filter: blur(5px);
}

.callout-tip {
  border-right-color: #7eb8f7;
}

.callout-tip::before {
  content: '💡 ';
}

.callout-fact {
  border-right-color: #f0c040;
}

.callout-fact::before {
  content: '⭐ ';
}

.callout-warning {
  border-right-color: #ff6b6b;
}

.callout-warning::before {
  content: '⚠️ ';
}

/* === CODE === */
pre {
  background: #0d0f19;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 1.5rem;
  overflow-x: auto;
  margin: 1.5rem 0;
}

code {
  font-family: 'Courier New', monospace;
  font-size: 0.9em;
  color: #aed581;
}

pre code {
  color: #e8eaf0;
}

/* === MERMAID === */
.mermaid {
  padding: 1.5rem;
  background: rgba(126, 184, 247, 0.05);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  margin: 1.5rem 0;
  overflow-x: auto;
}

/* === FAQ === */
details {
  margin: 1rem 0;
  padding: 1rem;
  background: rgba(126, 184, 247, 0.02);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  cursor: pointer;
}

summary {
  font-weight: 600;
  color: var(--color-accent);
  cursor: pointer;
  user-select: none;
  padding-right: 1rem;
}

summary:hover {
  color: var(--color-hover);
}

details[open] summary {
  color: var(--color-accent-gold);
  margin-bottom: 1rem;
}

details p {
  margin-bottom: 0.5em;
}

/* === BUTTONS === */
.btn-primary {
  display: inline-block;
  background: var(--color-accent-gold);
  color: var(--color-bg);
  padding: 0.75em 1.5em;
  border-radius: 6px;
  text-decoration: none;
  font-weight: 600;
  transition: transform 0.2s ease;
}

.btn-primary:hover {
  transform: scale(1.05);
  color: var(--color-bg);
}

/* === RELATED POSTS / INTERNAL LINKS === */
.related-posts ul,
.external-sources ul {
  list-style: none;
  padding: 0;
}

.related-posts li,
.external-sources li {
  margin: 0.75rem 0;
  padding: 0.75rem;
  background: rgba(126, 184, 247, 0.02);
  border-radius: 6px;
  border-right: 2px solid var(--color-accent);
  padding-right: 1rem;
}

.related-posts a,
.external-sources a {
  text-decoration: none;
  font-weight: 500;
}

.related-posts a:hover,
.external-sources a:hover {
  text-decoration: underline;
}

/* === GRID FOR HOMEPAGE === */
.posts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 2rem;
  margin: 2rem 0;
}

.post-card {
  background: rgba(126, 184, 247, 0.02);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 1.5rem;
  transition: transform 0.3s ease, border-color 0.3s ease;
  text-decoration: none;
  display: flex;
  flex-direction: column;
}

.post-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-accent);
}

.post-card .post-category {
  align-self: flex-start;
  margin-bottom: 0.75rem;
}

.post-card h3 {
  color: var(--color-accent);
  margin: 0 0 1rem 0;
  font-size: 1.2em;
}

.post-card time {
  display: block;
  margin-bottom: 0.75rem;
  font-size: 0.85em;
}

.post-card .excerpt {
  flex-grow: 1;
  margin-bottom: 1rem;
  font-size: 0.95em;
}

.post-card .read-more {
  color: var(--color-accent-gold);
  font-weight: 600;
  text-decoration: none;
}

.post-card .read-more:hover {
  color: var(--color-hover);
}

/* === PAGINATION === */
.pagination {
  text-align: center;
  margin: 2rem 0;
}

.pagination a,
.pagination span {
  display: inline-block;
  padding: 0.75rem 1rem;
  margin: 0.25rem;
  background: rgba(126, 184, 247, 0.1);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  text-decoration: none;
  color: var(--color-accent);
}

.pagination a:hover {
  background: rgba(126, 184, 247, 0.2);
}

.pagination .current {
  background: var(--color-accent);
  color: var(--color-bg);
  font-weight: 600;
}

/* === 404 PAGE === */
.error-page {
  text-align: center;
  padding: 4rem 2rem;
  min-height: 60vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

.error-page h1 {
  font-size: 4em;
  color: var(--color-accent-gold);
  margin-bottom: 1rem;
}

.error-page p {
  font-size: 1.2em;
  margin-bottom: 2rem;
}

/* === UTILITIES === */
.text-center {
  text-align: center;
}

.text-right {
  text-align: right;
}

.mt-1 { margin-top: 1rem; }
.mt-2 { margin-top: 2rem; }
.mb-1 { margin-bottom: 1rem; }
.mb-2 { margin-bottom: 2rem; }
.p-1 { padding: 1rem; }
.p-2 { padding: 2rem; }

/* === PRINT STYLES === */
@media print {
  body {
    background: white;
    color: black;
  }
  
  .site-header,
  .site-footer,
  .toc,
  .nav-toggle {
    display: none;
  }
  
  a {
    color: black;
  }
  
  h2 {
    border-right-color: black;
  }
}

/* === RESPONSIVE === */
@media (max-width: 768px) {
  h1 {
    font-size: 1.8em;
  }
  
  h2 {
    font-size: 1.4em;
  }
  
  .posts-grid {
    grid-template-columns: 1fr;
  }
  
  .post-article {
    padding: 0 1rem;
  }
}