/* ======= Variables ======= */
:root {
  --bg: #080d18;
  --bg2: #0d1424;
  --bg3: #111827;
  --card: rgba(255,255,255,0.04);
  --card-border: rgba(255,255,255,0.08);
  --accent: #00d4ff;
  --accent-glow: rgba(0, 212, 255, 0.12);
  --text: #e2e8f0;
  --text-muted: #8892a4;
  --white: #ffffff;
  --green: #22c55e;
  --udemy: #a435f0;
  --nav-h: 72px;
  --radius: 16px;
  --transition: 0.3s ease;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: 'Inter', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
img { max-width: 100%; display: block; }
button { cursor: pointer; border: none; background: none; }

::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: #7c3aed; border-radius: 3px; }

/* ======= Navbar ======= */
#navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  height: var(--nav-h);
  background: rgba(8,13,24,0.9);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--card-border);
}
.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-logo {
  font-family: 'JetBrains Mono', monospace;
  font-size: 22px;
  font-weight: 700;
  color: var(--accent);
}
.nav-links {
  display: flex;
  gap: 6px;
  list-style: none;
}
.nav-links .nav-link {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-muted);
  transition: color var(--transition), background var(--transition);
}
.nav-links .nav-link:hover,
.nav-links .nav-link.active {
  color: var(--accent);
  background: var(--accent-glow);
}
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 4px;
}
.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
}
.mobile-menu {
  display: none;
  flex-direction: column;
  padding: 16px 24px;
  gap: 4px;
  background: var(--bg2);
  border-bottom: 1px solid var(--card-border);
}
.mobile-menu .nav-link {
  padding: 12px 16px;
  border-radius: 8px;
  font-size: 15px;
  color: var(--text-muted);
}
.mobile-menu.open { display: flex; }

/* ======= Blog Hero ======= */
.blog-hero {
  padding-top: var(--nav-h);
  padding-bottom: 70px;
  position: relative;
  overflow: hidden;
  text-align: center;
}
.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(0,212,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,212,255,0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none;
}
.hero-glow {
  position: absolute;
  top: -150px; left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 500px;
  background: radial-gradient(circle, rgba(0,212,255,0.07) 0%, transparent 70%);
  pointer-events: none;
}
.blog-hero-content {
  position: relative;
  z-index: 1;
  padding-top: 60px;
}
.blog-hero-content .mono {
  font-family: 'JetBrains Mono', monospace;
  font-size: 14px;
  color: var(--accent);
  display: block;
  margin-bottom: 16px;
}
.blog-hero-content h1 {
  font-size: clamp(36px, 5vw, 56px);
  font-weight: 800;
  color: var(--white);
  margin-bottom: 14px;
}
.blog-hero-content p {
  font-size: 16px;
  color: var(--text-muted);
  max-width: 480px;
  margin: 0 auto;
}

/* ======= Layout ======= */
.blog-main {
  padding: 60px 24px 100px;
}
.container {
  max-width: 1200px;
  margin: 0 auto;
}
.blog-layout {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 40px;
  align-items: start;
}

/* ======= Posts ======= */
.posts-grid {
  display: flex;
  flex-direction: column;
  gap: 24px;
}
.post-card {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 28px 32px;
  transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
  position: relative;
}
.post-card:hover {
  border-color: var(--accent);
  transform: translateY(-3px);
  box-shadow: 0 8px 30px rgba(0,212,255,0.08);
}
.post-cat {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
  margin-bottom: 14px;
}
.cat-bugbounty  { background: rgba(0,212,255,0.12); color: var(--accent); }
.cat-web        { background: rgba(124,58,237,0.15); color: #a78bfa; }
.cat-writeup    { background: rgba(34,197,94,0.12);  color: #4ade80; }
.cat-tool       { background: rgba(251,191,36,0.12); color: #fbbf24; }
.cat-appsec     { background: rgba(239,68,68,0.12);  color: #f87171; }

.post-title {
  font-size: 20px;
  font-weight: 700;
  line-height: 1.35;
  margin-bottom: 10px;
}
.post-title a {
  color: var(--white);
  transition: color var(--transition);
}
.post-title a:hover { color: var(--accent); }

.post-excerpt {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.75;
  margin-bottom: 20px;
}
.post-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
}
.post-date {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--text-muted);
}
.post-read {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  font-weight: 600;
  color: var(--accent);
  transition: gap var(--transition);
}
.post-read:hover { gap: 10px; }

/* ======= Sidebar ======= */
.sidebar {
  display: flex;
  flex-direction: column;
  gap: 24px;
  position: sticky;
  top: calc(var(--nav-h) + 24px);
}
.sidebar-card {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 24px;
}
.author-card {
  text-align: center;
}
.author-img {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--accent);
  margin: 0 auto 14px;
}
.author-card h3 {
  font-size: 16px;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 6px;
}
.author-card p {
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 16px;
  line-height: 1.5;
}
.author-socials {
  display: flex;
  justify-content: center;
  gap: 8px;
}
.author-socials a {
  width: 34px;
  height: 34px;
  border-radius: 8px;
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--card-border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 15px;
  color: var(--text-muted);
  transition: all var(--transition);
}
.author-socials a:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-glow);
}
.sidebar-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--white);
  text-transform: uppercase;
  letter-spacing: 0.8px;
  margin-bottom: 16px;
}
.cat-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.cat-list a {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  color: var(--text-muted);
  transition: color var(--transition);
}
.cat-list a:hover { color: var(--white); }
.cat-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}
.cat-bugbounty-dot { background: var(--accent); }
.cat-web-dot       { background: #a78bfa; }
.cat-tool-dot      { background: #fbbf24; }
.cat-writeup-dot   { background: #4ade80; }
.cat-appsec-dot    { background: #f87171; }

/* Udemy sidebar card */
.udemy-card {
  border-color: rgba(164,53,240,0.3);
  background: rgba(164,53,240,0.05);
}
.udemy-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--udemy);
  color: #fff;
  font-size: 11px;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 999px;
  margin-bottom: 12px;
}
.udemy-card h4 {
  font-size: 14px;
  font-weight: 700;
  color: var(--white);
  line-height: 1.4;
  margin-bottom: 8px;
}
.udemy-card p {
  font-size: 12px;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 0;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: 10px;
  font-size: 13px;
  font-weight: 600;
  transition: all var(--transition);
  cursor: pointer;
  border: none;
  font-family: 'Inter', sans-serif;
  width: 100%;
  margin-top: 16px;
}
.btn-udemy {
  background: var(--udemy);
  color: #fff;
  box-shadow: 0 0 20px rgba(164,53,240,0.25);
}
.btn-udemy:hover {
  background: #b94eff;
  box-shadow: 0 0 30px rgba(164,53,240,0.45);
  transform: translateY(-2px);
}

/* ======= Footer ======= */
footer {
  background: var(--bg);
  border-top: 1px solid var(--card-border);
  padding: 40px 24px;
}
.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}
.footer-logo {
  font-family: 'JetBrains Mono', monospace;
  font-size: 20px;
  font-weight: 700;
  color: var(--accent);
}
footer p { font-size: 13px; color: var(--text-muted); }
.footer-socials { display: flex; gap: 10px; }
.footer-socials a {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  background: var(--card);
  border: 1px solid var(--card-border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 15px;
  color: var(--text-muted);
  transition: all var(--transition);
}
.footer-socials a:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-glow);
}

/* ======= Back to top ======= */
.back-top {
  position: fixed;
  right: 24px; bottom: 24px;
  z-index: 999;
  width: 44px; height: 44px;
  border-radius: 12px;
  background: var(--accent);
  color: #080d18;
  font-size: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition);
  box-shadow: 0 4px 20px rgba(0,212,255,0.3);
}
.back-top.visible { opacity: 1; visibility: visible; }
.back-top:hover { transform: translateY(-3px); }

/* ======= Responsive ======= */
@media (max-width: 1024px) {
  .blog-layout { grid-template-columns: 1fr; }
  .sidebar { position: static; }
}
@media (max-width: 768px) {
  .nav-links { display: none; }
  .hamburger { display: flex; }
  .footer-inner { flex-direction: column; text-align: center; }
}
@media (max-width: 480px) {
  .post-card { padding: 20px; }
  .blog-main { padding: 40px 16px 80px; }
}