/* ==========================================================================
   TechGuide (rzwan.cloud) - Stylesheet
   Modern, Lightweight, Responsive LTR Design for English Tech Guides
   ========================================================================== */

:root {
  --primary: #0284c7;
  --primary-hover: #0369a1;
  --primary-light: #e0f2fe;
  --secondary: #0f172a;
  --text-main: #1e293b;
  --text-muted: #64748b;
  --bg-main: #f8fafc;
  --bg-card: #ffffff;
  --border-color: #e2e8f0;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -2px rgba(0,0,0,0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.08);
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
}

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

html, body {
  direction: ltr;
  text-align: left;
  font-family: var(--font-family);
  background-color: var(--bg-main);
  color: var(--text-main);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  max-width: 100%;
  overflow-x: hidden;
}

*, *::before, *::after {
  box-sizing: border-box;
  min-width: 0;
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

.container {
  width: 100%;
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 1.25rem;
}

/* Header & Navigation */
.site-header {
  background-color: var(--bg-card);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-sm);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 0;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--secondary);
}

.site-logo a {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: inherit;
  text-decoration: none;
}

.logo-badge {
  background: linear-gradient(135deg, var(--primary), #0369a1);
  color: #ffffff;
  padding: 0.35rem 0.65rem;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 600;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  list-style: none;
}

.main-nav a {
  color: var(--text-muted);
  font-weight: 500;
  padding: 0.5rem 0.25rem;
  border-bottom: 2px solid transparent;
  transition: all 0.2s ease;
}

.main-nav a:hover,
.main-nav a.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
}

/* Hero Section */
.hero-section {
  background: linear-gradient(180deg, #ffffff 0%, var(--bg-main) 100%);
  padding: 3.5rem 0 2.5rem 0;
  border-bottom: 1px solid var(--border-color);
  text-align: center;
}

.hero-tag {
  display: inline-block;
  background-color: var(--primary-light);
  color: var(--primary);
  font-size: 0.875rem;
  font-weight: 600;
  padding: 0.35rem 1rem;
  border-radius: 9999px;
  margin-bottom: 1rem;
}

.hero-title {
  font-size: 2.25rem;
  color: var(--secondary);
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 1rem;
}

.hero-description {
  font-size: 1.125rem;
  color: var(--text-muted);
  max-width: 720px;
  margin: 0 auto 1.5rem auto;
}

/* Grid & Cards */
.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
  border-bottom: 2px solid var(--border-color);
  padding-bottom: 0.75rem;
}

.section-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--secondary);
}

.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.75rem;
  margin-bottom: 2.5rem;
}

.article-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  display: flex;
  flex-direction: column;
}

.article-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.card-header-thumb {
  height: 150px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  font-size: 2.2rem;
  font-weight: 700;
}

.thumb-ai { background: linear-gradient(135deg, #4f46e5, #06b6d4); }
.thumb-vps { background: linear-gradient(135deg, #0284c7, #10b981); }
.thumb-sec { background: linear-gradient(135deg, #ef4444, #f59e0b); }
.thumb-docker { background: linear-gradient(135deg, #0284c7, #2563eb); }
.thumb-git { background: linear-gradient(135deg, #ea580c, #f97316); }
.thumb-sql { background: linear-gradient(135deg, #0891b2, #0284c7); }
.thumb-py { background: linear-gradient(135deg, #2563eb, #10b981); }

.card-body {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.card-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

.badge {
  background-color: var(--primary-light);
  color: var(--primary);
  font-weight: 600;
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-sm);
}

.card-title {
  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1.45;
  margin-bottom: 0.75rem;
  color: var(--secondary);
}

.card-title a {
  color: var(--secondary);
}

.card-title a:hover {
  color: var(--primary);
}

.card-excerpt {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.6;
  margin-bottom: 1.25rem;
  flex-grow: 1;
}

.card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--border-color);
  padding-top: 1rem;
  font-size: 0.875rem;
}

.read-more {
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

/* Article / Single Post Layout */
.article-container {
  max-width: 860px;
  width: 100%;
  margin: 2rem auto;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 2.5rem;
  box-shadow: var(--shadow-sm);
  min-width: 0;
  box-sizing: border-box;
}

.content-body {
  min-width: 0;
  max-width: 100%;
  overflow-wrap: break-word;
  word-break: break-word;
}

.article-header {
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 1.5rem;
  margin-bottom: 2rem;
}

.article-title {
  font-size: 2.1rem;
  font-weight: 800;
  color: var(--secondary);
  line-height: 1.35;
  margin: 1rem 0;
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1.25rem;
  font-size: 0.875rem;
  color: var(--text-muted);
}

.content-body h2 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--secondary);
  margin: 2.25rem 0 1rem 0;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--primary-light);
}

.content-body h3 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--secondary);
  margin: 1.75rem 0 0.75rem 0;
}

.content-body p {
  margin-bottom: 1.25rem;
  font-size: 1.05rem;
  line-height: 1.8;
}

.content-body ul, .content-body ol {
  margin: 1rem 0 1.5rem 1.75rem;
}

.content-body li {
  margin-bottom: 0.6rem;
  line-height: 1.7;
}

.callout {
  background-color: var(--primary-light);
  border-left: 4px solid var(--primary);
  padding: 1.25rem;
  border-radius: var(--radius-sm);
  margin: 1.75rem 0;
  font-size: 0.975rem;
  line-height: 1.7;
}

.code-box, pre.code-box {
  display: block;
  width: 100%;
  max-width: 100%;
  box-sizing: border-box;
  direction: ltr;
  text-align: left;
  background-color: #1e293b;
  color: #f8fafc;
  padding: 1.1rem 1.25rem;
  border-radius: var(--radius-sm);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  font-size: 0.9rem;
  line-height: 1.55;
  overflow-x: auto;
  margin: 1.25rem 0;
  white-space: pre;
}

code {
  background-color: #f1f5f9;
  color: #0f172a;
  padding: 0.15rem 0.35rem;
  border-radius: 4px;
  font-size: 0.9em;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

pre.code-box code {
  background: transparent;
  color: inherit;
  padding: 0;
}

/* Static Pages (About, Contact, Privacy) */
.page-container {
  max-width: 860px;
  margin: 2rem auto;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 2.5rem;
  box-shadow: var(--shadow-sm);
}

.page-title {
  font-size: 2.1rem;
  font-weight: 800;
  color: var(--secondary);
  margin-bottom: 1.5rem;
  border-bottom: 2px solid var(--border-color);
  padding-bottom: 0.75rem;
}

/* Contact Form */
.contact-form {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  margin-top: 1.5rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.form-group label {
  font-weight: 600;
  font-size: 0.9rem;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 1rem;
  background-color: #ffffff;
  transition: border-color 0.2s;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary);
}

.btn-submit {
  background-color: var(--primary);
  color: #ffffff;
  border: none;
  padding: 0.85rem 1.75rem;
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  align-self: flex-start;
  transition: background-color 0.2s;
}

.btn-submit:hover {
  background-color: var(--primary-hover);
}

/* Footer */
.site-footer {
  background-color: var(--secondary);
  color: #cbd5e1;
  padding: 3rem 0 1.5rem 0;
  margin-top: 4rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 2.5rem;
  margin-bottom: 2.5rem;
}

.footer-col h4 {
  color: #ffffff;
  font-size: 1.1rem;
  margin-bottom: 1rem;
}

.footer-col p {
  font-size: 0.9rem;
  line-height: 1.7;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.footer-links a {
  color: #94a3b8;
  font-size: 0.9rem;
}

.footer-links a:hover {
  color: #ffffff;
}

.footer-bottom {
  border-top: 1px solid #334155;
  padding-top: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.85rem;
  color: #64748b;
}

/* Responsive */
@media (max-width: 768px) {
  .header-inner {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }
  .main-nav {
    flex-wrap: wrap;
    justify-content: center;
    gap: 1rem;
  }
  .hero-title {
    font-size: 1.75rem;
  }
  .article-container,
  .page-container {
    padding: 1.5rem;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  .footer-bottom {
    flex-direction: column;
    gap: 0.75rem;
    text-align: center;
  }
}

/* Reading and keyboard navigation */
.skip-link{position:absolute;left:1rem;top:-6rem;background:#fff;color:#111;padding:1rem;z-index:1000}.skip-link:focus{top:1rem}a:focus-visible,button:focus-visible{outline:3px solid #38bdf8;outline-offset:4px}.toc{padding:1.25rem;border:1px solid var(--border-color);border-radius:12px;margin:1.5rem 0}.toc ul{columns:2;margin-bottom:0}.toc li{break-inside:avoid;margin:.4rem 0}.editorial-footer{padding-bottom:2rem}.code-box{max-width:100%;overflow-x:auto}.content-body{overflow-wrap:anywhere}h2[id]{scroll-margin-top:6rem}.lab-results{white-space:pre-wrap}@media(max-width:640px){.toc ul{columns:1}.article-title{font-size:1.8rem}.main-nav{flex-wrap:wrap}.header-inner{flex-wrap:wrap;gap:1rem}}