/*
Theme Name: TechPulse
Theme URI: https://example.com/techpulse
Author: TechPulse Theme
Author URI: https://example.com
Description: A super-fast, SEO-optimized WordPress theme for tech blogs. Lightweight, clean, and developer-friendly.
Version: 1.0.0
Requires at least: 6.0
Tested up to: 6.7
Requires PHP: 8.0
License: GPL-2.0-or-later
License URI: https://www.gnu.org/licenses/gpl-2.0.html
Text Domain: techpulse
Tags: blog, technology, seo, fast, minimal, responsive, dark-mode
*/

/* ============================================
   CSS VARIABLES
============================================ */
:root {
  --color-bg: #0a0e1a;
  --color-surface: #111827;
  --color-surface-2: #1a2235;
  --color-border: #1e2d45;
  --color-text: #e2e8f0;
  --color-muted: #8892a4;
  --color-accent: #00d4ff;
  --color-accent-2: #7c3aed;
  --color-accent-glow: rgba(0, 212, 255, 0.15);
  --color-white: #ffffff;
  --color-danger: #ef4444;
  --color-success: #22c55e;

  --font-display: 'Syne', 'Arial Black', sans-serif;
  --font-body: 'DM Sans', 'Helvetica Neue', sans-serif;
  --font-mono: 'JetBrains Mono', 'Courier New', monospace;
  --font-bengali: 'Hind Siliguri', 'Noto Sans Bengali', sans-serif;

  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;

  --shadow-sm: 0 1px 3px rgba(0,0,0,0.4);
  --shadow-md: 0 4px 24px rgba(0,0,0,0.5);
  --shadow-glow: 0 0 30px rgba(0, 212, 255, 0.12);

  --max-width: 1200px;
  --content-width: 740px;

  --transition: 0.22s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Light mode */
@media (prefers-color-scheme: light) {
  :root {
    --color-bg: #f8fafc;
    --color-surface: #ffffff;
    --color-surface-2: #f1f5f9;
    --color-border: #e2e8f0;
    --color-text: #0f172a;
    --color-muted: #64748b;
    --color-accent-glow: rgba(0, 150, 200, 0.08);
  }
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
  font-size: 1rem;
  -webkit-font-smoothing: antialiased;
}

img, video { max-width: 100%; height: auto; display: block; }
a { color: var(--color-accent); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--color-white); }

ul, ol { padding-left: 1.5rem; }

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

.layout-grid {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 3rem;
  align-items: start;
}

@media (max-width: 900px) {
  .layout-grid { grid-template-columns: 1fr; }
}

/* ============================================
   HEADER
============================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 14, 26, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-border);
  padding: 0;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  gap: 2rem;
}

.site-logo {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--color-white);
  letter-spacing: -0.02em;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

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

.site-nav ul {
  display: flex;
  list-style: none;
  padding: 0;
  gap: 0.25rem;
}

.site-nav a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-muted);
  padding: 0.4rem 0.85rem;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}

.site-nav a:hover,
.site-nav .current-menu-item a {
  color: var(--color-white);
  background: var(--color-surface-2);
}

.header-search input {
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 0.4rem 0.9rem;
  font-size: 0.85rem;
  color: var(--color-text);
  width: 180px;
  transition: all var(--transition);
}

.header-search input:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-glow);
  width: 220px;
}

.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--color-text);
  cursor: pointer;
  font-size: 1.5rem;
  padding: 0.4rem;
}

@media (max-width: 768px) {
  .site-nav, .header-search { display: none; }
  .mobile-menu-toggle { display: block; }
}

/* ============================================
   HERO / FEATURED
============================================ */
.hero-section {
  padding: 4rem 0 2rem;
}

.featured-post {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: transform var(--transition), box-shadow var(--transition);
}

.featured-post:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-glow), var(--shadow-md);
}

.featured-post .post-image {
  aspect-ratio: 4/3;
  object-fit: cover;
  width: 100%;
  height: 100%;
}

.featured-post .post-content {
  padding: 2.5rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 1rem;
}

.featured-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-accent);
  background: var(--color-accent-glow);
  border: 1px solid rgba(0, 212, 255, 0.2);
  padding: 0.3rem 0.7rem;
  border-radius: 999px;
  width: fit-content;
}

@media (max-width: 700px) {
  .featured-post { grid-template-columns: 1fr; }
  .featured-post .post-image { aspect-ratio: 16/7; }
}

/* ============================================
   CATEGORY BADGE
============================================ */
.cat-badge {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  padding: 0.25rem 0.65rem;
  border-radius: 999px;
  background: var(--color-surface-2);
  color: var(--color-accent);
  border: 1px solid var(--color-border);
  transition: all var(--transition);
}

.cat-badge:hover {
  background: var(--color-accent);
  color: var(--color-bg);
  border-color: var(--color-accent);
}

/* ============================================
   POST CARDS
============================================ */
.posts-section { padding: 3rem 0; }

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 2rem;
}

.section-title {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-white);
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.section-title::before {
  content: '';
  display: block;
  width: 4px;
  height: 1.2em;
  background: var(--color-accent);
  border-radius: 2px;
}

.posts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
}

.post-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  display: flex;
  flex-direction: column;
}

.post-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
  border-color: rgba(0, 212, 255, 0.2);
}

.post-card .card-image {
  aspect-ratio: 16/9;
  object-fit: cover;
  width: 100%;
}

.card-body {
  padding: 1.25rem;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.card-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.card-title {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-white);
  line-height: 1.35;
  letter-spacing: -0.01em;
  transition: color var(--transition);
}

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

.card-excerpt {
  font-size: 0.875rem;
  color: var(--color-muted);
  line-height: 1.65;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card-footer {
  margin-top: auto;
  padding-top: 0.75rem;
  border-top: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
}

.read-time {
  font-size: 0.75rem;
  color: var(--color-muted);
  font-family: var(--font-mono);
}

.read-more {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-accent);
  display: flex;
  align-items: center;
  gap: 0.3rem;
  transition: gap var(--transition);
}

.read-more:hover { gap: 0.6rem; color: var(--color-accent); }

/* ============================================
   SINGLE POST
============================================ */
.single-hero {
  padding: 3rem 0 2rem;
}

.single-hero .post-header {
  max-width: var(--content-width);
  margin: 0 auto;
}

.post-title-main {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  font-weight: 800;
  color: var(--color-white);
  line-height: 1.2;
  letter-spacing: -0.025em;
  margin-bottom: 1.25rem;
}

.post-meta-bar {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: wrap;
  font-size: 0.875rem;
  color: var(--color-muted);
  margin-bottom: 2rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--color-border);
}

.author-mini {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.author-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--color-accent);
}

.featured-image-wrap {
  max-width: var(--content-width);
  margin: 0 auto 2.5rem;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--color-border);
}

.featured-image-wrap img { width: 100%; aspect-ratio: 16/7; object-fit: cover; }

/* ============================================
   POST CONTENT (ENTRY CONTENT)
============================================ */
.entry-content {
  max-width: var(--content-width);
  margin: 0 auto;
  font-size: 1.05rem;
  line-height: 1.8;
}

.entry-content h2 {
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--color-white);
  margin: 2.5rem 0 1rem;
  letter-spacing: -0.02em;
}

.entry-content h3 {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-white);
  margin: 2rem 0 0.75rem;
}

.entry-content p { margin-bottom: 1.5rem; }

.entry-content a {
  color: var(--color-accent);
  text-decoration: underline;
  text-decoration-color: rgba(0, 212, 255, 0.3);
  text-underline-offset: 3px;
}

.entry-content blockquote {
  border-left: 3px solid var(--color-accent);
  padding: 1rem 1.5rem;
  margin: 2rem 0;
  background: var(--color-surface-2);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-style: italic;
  color: var(--color-muted);
}

.entry-content pre {
  background: #0d1117;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  overflow-x: auto;
  margin: 1.5rem 0;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  line-height: 1.6;
}

.entry-content code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  padding: 0.15em 0.4em;
  border-radius: 4px;
  color: var(--color-accent);
}

.entry-content pre code {
  background: none;
  border: none;
  padding: 0;
  color: #e6edf3;
}

.entry-content img {
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  margin: 1.5rem 0;
}

.entry-content ul, .entry-content ol {
  margin-bottom: 1.5rem;
  color: var(--color-text);
}

.entry-content li { margin-bottom: 0.5rem; }

/* ============================================
   TABLE OF CONTENTS
============================================ */
.toc-box {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  margin-bottom: 2.5rem;
  max-width: var(--content-width);
  margin-left: auto;
  margin-right: auto;
}

.toc-box h4 {
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-accent);
  margin-bottom: 0.75rem;
}

.toc-list { list-style: none; padding: 0; }
.toc-list li { padding: 0.25rem 0; border-bottom: 1px solid var(--color-border); }
.toc-list li:last-child { border-bottom: none; }
.toc-list a { font-size: 0.9rem; color: var(--color-muted); }
.toc-list a:hover { color: var(--color-accent); }

/* ============================================
   POST TAGS
============================================ */
.post-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--color-border);
  max-width: var(--content-width);
  margin-left: auto;
  margin-right: auto;
}

.tag-pill {
  font-size: 0.8rem;
  color: var(--color-muted);
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  padding: 0.3rem 0.75rem;
  transition: all var(--transition);
}

.tag-pill:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
}

/* ============================================
   RELATED POSTS
============================================ */
.related-posts {
  padding: 3rem 0;
  border-top: 1px solid var(--color-border);
}

/* ============================================
   SIDEBAR
============================================ */
.sidebar { position: sticky; top: 80px; }

.widget {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
}

.widget-title {
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-accent);
  margin-bottom: 1.1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--color-border);
}

.widget ul { list-style: none; padding: 0; }
.widget li { padding: 0.5rem 0; border-bottom: 1px solid var(--color-border); font-size: 0.9rem; }
.widget li:last-child { border-bottom: none; }

/* Newsletter widget */
.newsletter-widget { background: linear-gradient(135deg, #0d1f3c, var(--color-surface-2)); }
.newsletter-widget p { font-size: 0.875rem; color: var(--color-muted); margin-bottom: 1rem; }

.newsletter-form { display: flex; flex-direction: column; gap: 0.75rem; }
.newsletter-form input {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 0.65rem 1rem;
  font-size: 0.875rem;
  color: var(--color-text);
  transition: border-color var(--transition);
}
.newsletter-form input:focus { outline: none; border-color: var(--color-accent); }
.newsletter-form button {
  background: var(--color-accent);
  color: var(--color-bg);
  border: none;
  border-radius: var(--radius-sm);
  padding: 0.65rem;
  font-weight: 700;
  font-size: 0.875rem;
  cursor: pointer;
  transition: opacity var(--transition);
  font-family: var(--font-body);
}
.newsletter-form button:hover { opacity: 0.85; }

/* ============================================
   PAGINATION
============================================ */
.pagination {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  padding: 3rem 0;
  flex-wrap: wrap;
}

.pagination .page-numbers {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 600;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  color: var(--color-muted);
  transition: all var(--transition);
}

.pagination .page-numbers:hover,
.pagination .page-numbers.current {
  background: var(--color-accent);
  color: var(--color-bg);
  border-color: var(--color-accent);
}

/* ============================================
   FOOTER
============================================ */
.site-footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: 3rem 0 1.5rem;
  margin-top: 4rem;
}

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

.footer-brand p {
  font-size: 0.875rem;
  color: var(--color-muted);
  margin-top: 0.75rem;
  max-width: 280px;
  line-height: 1.6;
}

.footer-heading {
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-white);
  margin-bottom: 1rem;
}

.footer-links { list-style: none; padding: 0; }
.footer-links li { margin-bottom: 0.5rem; }
.footer-links a { font-size: 0.875rem; color: var(--color-muted); transition: color var(--transition); }
.footer-links a:hover { color: var(--color-accent); }

.footer-bottom {
  border-top: 1px solid var(--color-border);
  padding-top: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.8rem;
  color: var(--color-muted);
}

@media (max-width: 768px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 480px) {
  .footer-grid { grid-template-columns: 1fr; }
}

/* ============================================
   UTILITY
============================================ */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  border: 0;
}

.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  background: var(--color-accent);
  color: var(--color-bg);
  padding: 0.5rem 1rem;
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  font-weight: 700;
  font-size: 0.875rem;
  z-index: 999;
  transition: top 0.2s;
}

.skip-link:focus { top: 0; }

/* ============================================
   BENGALI LANGUAGE SUPPORT
============================================ */
:lang(bn) body,
:lang(bn) .entry-content,
.lang-bn body,
.lang-bn .entry-content {
  font-family: var(--font-bengali);
  font-size: 1.05rem;
  line-height: 1.9;
}
.entry-content:lang(bn),
.entry-content *:lang(bn) {
  font-family: var(--font-bengali);
  line-height: 1.9;
}
.bn, [lang="bn"] {
  font-family: var(--font-bengali);
  line-height: 1.9;
}
.post-title-main:lang(bn), .card-title:lang(bn) {
  font-family: var(--font-bengali);
  font-weight: 600;
  letter-spacing: 0;
}

/* ============================================
   SEARCH RESULTS
============================================ */
.search-header { padding: 2rem 0 1rem; }
.search-header h1 { font-family: var(--font-display); font-size: 1.75rem; color: var(--color-white); }

/* ============================================
   404
============================================ */
.page-404 {
  text-align: center;
  padding: 6rem 0;
}
.page-404 h1 {
  font-family: var(--font-display);
  font-size: clamp(4rem, 12vw, 8rem);
  font-weight: 800;
  color: var(--color-accent);
  line-height: 1;
  margin-bottom: 1rem;
}
.page-404 h2 { font-size: 1.5rem; color: var(--color-white); margin-bottom: 1rem; }
.page-404 p { color: var(--color-muted); margin-bottom: 2rem; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: var(--color-accent);
  color: var(--color-bg);
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: 0.9rem;
  transition: opacity var(--transition), transform var(--transition);
}

.btn:hover { opacity: 0.85; transform: translateY(-2px); color: var(--color-bg); }

/* ============================================
   PROGRESS BAR (Reading)
============================================ */
#reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 0%;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent), var(--color-accent-2));
  z-index: 9999;
  transition: width 0.1s linear;
}