/* === Blog Styles — TunlVPN === */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --bg: #0a0a14;
  --bg-light: #10101e;
  --bg-card: rgba(255, 255, 255, 0.04);
  --glass: rgba(255, 255, 255, 0.06);
  --glass-border: rgba(255, 255, 255, 0.08);
  --glass-hover: rgba(255, 255, 255, 0.1);
  --white: #ffffff;
  --white-90: rgba(255, 255, 255, 0.9);
  --white-70: rgba(255, 255, 255, 0.7);
  --white-50: rgba(255, 255, 255, 0.5);
  --white-30: rgba(255, 255, 255, 0.3);
  --white-15: rgba(255, 255, 255, 0.15);
  --accent-1: #4facfe;
  --accent-2: #00f2fe;
  --gradient: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
  --radius: 16px;
  --radius-lg: 24px;
  --radius-sm: 8px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg);
  color: var(--white);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a {
  color: inherit;
  text-decoration: none;
}

img { max-width: 100%; height: auto; }

/* === Container === */
.container {
  width: 100%;
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 20px;
}

/* === Header === */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 14px 0;
  background: rgba(10, 10, 20, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--glass-border);
}

.header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--white);
}

.logo span {
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.header-nav {
  display: flex;
  align-items: center;
  gap: 28px;
}

.header-nav a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--white-70);
  transition: color var(--transition);
}

.header-nav a:hover {
  color: var(--white);
}

.header-nav a.active {
  color: var(--accent-1);
}

.header-cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 18px;
  background: var(--gradient);
  color: var(--bg) !important;
  border-radius: 50px;
  font-weight: 600;
  font-size: 0.85rem;
  transition: transform var(--transition), box-shadow var(--transition);
}

.header-cta:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 20px rgba(79, 172, 254, 0.4);
}

.header-cta svg {
  width: 16px;
  height: 16px;
}

/* Mobile menu */
.mobile-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--white);
  cursor: pointer;
  padding: 4px;
}

.mobile-toggle svg {
  width: 24px;
  height: 24px;
}

@media (max-width: 768px) {
  .header-nav {
    position: fixed;
    top: 56px;
    left: 0;
    right: 0;
    background: rgba(10, 10, 20, 0.95);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 20px;
    gap: 16px;
    border-bottom: 1px solid var(--glass-border);
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.3s ease, opacity 0.3s ease;
  }

  .header-nav.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: all;
  }

  .mobile-toggle {
    display: block;
  }
}

/* === Blog Index Hero === */
.blog-hero {
  padding: 140px 0 60px;
  text-align: center;
}

.blog-hero h1 {
  font-size: clamp(1.8rem, 5vw, 2.8rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 12px;
  line-height: 1.15;
}

.gradient-text {
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.blog-hero p {
  color: var(--white-70);
  font-size: clamp(1rem, 2.5vw, 1.15rem);
  max-width: 560px;
  margin: 0 auto;
}

/* === Category Filter === */
.category-filter {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin-bottom: 48px;
}

.category-btn {
  background: var(--glass);
  border: 1px solid var(--glass-border);
  color: var(--white-70);
  padding: 8px 18px;
  border-radius: 50px;
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  font-family: inherit;
}

.category-btn:hover,
.category-btn.active {
  background: rgba(79, 172, 254, 0.15);
  border-color: var(--accent-1);
  color: var(--white);
}

/* === Articles Grid === */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 24px;
  margin-bottom: 80px;
}

@media (max-width: 400px) {
  .articles-grid {
    grid-template-columns: 1fr;
  }
}

/* === Article Card === */
.article-card {
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  padding: 28px 24px;
  transition: all var(--transition);
  display: flex;
  flex-direction: column;
  backdrop-filter: blur(10px);
}

.article-card:hover {
  background: var(--glass-hover);
  border-color: rgba(79, 172, 254, 0.2);
  transform: translateY(-4px);
  box-shadow: 0 8px 40px rgba(79, 172, 254, 0.08);
}

.article-card .card-category {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent-1);
  margin-bottom: 12px;
}

.article-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  line-height: 1.35;
  margin-bottom: 10px;
  letter-spacing: -0.01em;
}

.article-card .card-desc {
  color: var(--white-70);
  font-size: 0.9rem;
  line-height: 1.55;
  margin-bottom: 16px;
  flex: 1;
}

.article-card .card-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.8rem;
  color: var(--white-50);
}

.card-meta span {
  display: flex;
  align-items: center;
  gap: 4px;
}

.card-meta svg {
  width: 14px;
  height: 14px;
  opacity: 0.7;
}

/* === Article Page === */
.article-hero {
  padding: 130px 0 40px;
  text-align: center;
}

.article-hero .breadcrumb {
  font-size: 0.85rem;
  color: var(--white-50);
  margin-bottom: 20px;
}

.article-hero .breadcrumb a {
  color: var(--accent-1);
  transition: color var(--transition);
}

.article-hero .breadcrumb a:hover {
  color: var(--accent-2);
}

.article-hero h1 {
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.2;
  max-width: 750px;
  margin: 0 auto 16px;
}

.article-meta-top {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  color: var(--white-50);
  font-size: 0.88rem;
  flex-wrap: wrap;
}

.article-meta-top span {
  display: flex;
  align-items: center;
  gap: 5px;
}

.article-meta-top svg {
  width: 16px;
  height: 16px;
  opacity: 0.6;
}

/* === Article Content === */
.article-content-wrapper {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 40px;
  max-width: 960px;
  margin: 0 auto;
  padding: 40px 20px 80px;
  align-items: start;
}

@media (max-width: 860px) {
  .article-content-wrapper {
    grid-template-columns: 1fr;
    gap: 24px;
  }
}

/* === Table of Contents === */
.toc {
  position: sticky;
  top: 90px;
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  padding: 20px;
  backdrop-filter: blur(10px);
}

.toc-title {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--white-50);
  margin-bottom: 12px;
}

.toc a {
  display: block;
  font-size: 0.85rem;
  color: var(--white-70);
  padding: 5px 0;
  border-left: 2px solid transparent;
  padding-left: 12px;
  transition: all var(--transition);
  line-height: 1.4;
}

.toc a:hover,
.toc a.active {
  color: var(--accent-1);
  border-left-color: var(--accent-1);
}

@media (max-width: 860px) {
  .toc {
    position: static;
  }
}

/* === Article Body === */
.article-body {
  min-width: 0;
}

.article-body h2 {
  font-size: 1.45rem;
  font-weight: 700;
  margin: 40px 0 16px;
  letter-spacing: -0.02em;
  scroll-margin-top: 80px;
}

.article-body h2:first-child {
  margin-top: 0;
}

.article-body h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin: 28px 0 12px;
  scroll-margin-top: 80px;
}

.article-body p {
  color: var(--white-90);
  font-size: 1rem;
  line-height: 1.75;
  margin-bottom: 16px;
}

.article-body ul,
.article-body ol {
  margin: 0 0 16px 20px;
  color: var(--white-90);
}

.article-body li {
  margin-bottom: 8px;
  line-height: 1.65;
  font-size: 1rem;
}

.article-body strong {
  color: var(--white);
  font-weight: 600;
}

.article-body a {
  color: var(--accent-1);
  text-decoration: underline;
  text-decoration-color: rgba(79, 172, 254, 0.3);
  text-underline-offset: 3px;
  transition: text-decoration-color var(--transition);
}

.article-body a:hover {
  text-decoration-color: var(--accent-1);
}

.article-body blockquote {
  border-left: 3px solid var(--accent-1);
  background: var(--glass);
  padding: 16px 20px;
  margin: 24px 0;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--white-90);
  font-style: italic;
}

.article-body blockquote p {
  margin-bottom: 0;
}

/* === CTA Box === */
.cta-box {
  background: linear-gradient(135deg, rgba(79, 172, 254, 0.1), rgba(0, 242, 254, 0.05));
  border: 1px solid rgba(79, 172, 254, 0.2);
  border-radius: var(--radius);
  padding: 32px;
  text-align: center;
  margin: 40px 0;
}

.cta-box h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin: 0 0 8px;
}

.cta-box p {
  color: var(--white-70);
  margin-bottom: 16px !important;
  font-size: 0.95rem;
}

.cta-button {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  background: var(--gradient);
  color: var(--bg);
  border-radius: 50px;
  font-weight: 700;
  font-size: 0.95rem;
  transition: transform var(--transition), box-shadow var(--transition);
}

.cta-button:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(79, 172, 254, 0.35);
  text-decoration: none;
}

.cta-button svg {
  width: 18px;
  height: 18px;
}

/* === Related Articles === */
.related-articles {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 20px 80px;
}

.related-articles h2 {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 24px;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}

/* === Footer === */
.footer {
  margin-top: auto;
  border-top: 1px solid var(--glass-border);
  padding: 40px 0;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-logo {
  font-size: 1.15rem;
  font-weight: 800;
}

.footer-logo span {
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.footer-links {
  display: flex;
  gap: 24px;
}

.footer-links a {
  color: var(--white-50);
  font-size: 0.85rem;
  transition: color var(--transition);
}

.footer-links a:hover {
  color: var(--white);
}

.footer-copy {
  width: 100%;
  text-align: center;
  color: var(--white-30);
  font-size: 0.8rem;
  margin-top: 16px;
}

/* === Pagination / Load More === */
.load-more {
  text-align: center;
  margin-bottom: 80px;
}

.load-more-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 32px;
  background: var(--glass);
  border: 1px solid var(--glass-border);
  color: var(--white);
  border-radius: 50px;
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  transition: all var(--transition);
  font-family: inherit;
}

.load-more-btn:hover {
  background: var(--glass-hover);
  border-color: var(--accent-1);
}

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

/* === Animations === */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.fade-in {
  animation: fadeUp 0.6s ease forwards;
}