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

/* ── Custom Properties ── */
:root {
  --bg: #0a0a0f;
  --bg-card: #12121a;
  --text: #c9d1d9;
  --text-muted: #8b949e;
  --heading: #e6edf3;
  --accent: #58a6ff;
  --accent-green: #3fb950;
  --border: #21262d;
  --nav-bg: rgba(10, 10, 15, 0.85);
  --font-mono: 'JetBrains Mono', monospace;
  --font-sans: 'Inter', sans-serif;
  --max-w: 720px;
  --transition: 0.2s ease;
}

[data-theme="light"] {
  --bg: #f6f8fa;
  --bg-card: #ffffff;
  --text: #24292f;
  --text-muted: #57606a;
  --heading: #1f2328;
  --accent: #0969da;
  --accent-green: #1a7f37;
  --border: #d0d7de;
  --nav-bg: rgba(246, 248, 250, 0.85);
}

/* ── Base ── */
html { scroll-behavior: smooth; scroll-padding-top: 5rem; }
body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  transition: background var(--transition), color var(--transition);
}

a { color: var(--accent); text-decoration: none; transition: opacity var(--transition); }
a:hover { opacity: 0.8; }

h1, h2, h3 { font-family: var(--font-mono); color: var(--heading); }

ul { list-style-position: inside; padding-left: 0; }
ul li { margin-bottom: 0.35rem; }

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

/* ── Nav ── */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: var(--nav-bg); backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: 960px;
  margin: 0 auto; padding: 0 1.5rem;
  display: flex; align-items: center; justify-content: space-between;
  height: 3.5rem;
}
.nav-logo {
  font-family: var(--font-mono); font-weight: 700; font-size: 1.25rem;
  color: var(--heading);
}
.nav-links { display: flex; align-items: center; gap: 1.25rem; }
.nav-links a {
  font-size: 0.85rem; color: var(--text-muted);
  transition: color var(--transition);
}
.nav-links a:hover { color: var(--heading); opacity: 1; }

/* ── Nav Dropdown ── */
.nav-dropdown {
  position: relative;
}
.nav-dropdown-toggle {
  background: none; border: none; cursor: pointer;
  font-family: var(--font-sans); font-size: 0.85rem; color: var(--text-muted);
  display: flex; align-items: center; gap: 0.3rem;
  transition: color var(--transition);
  padding: 0; line-height: 1;
}
.nav-dropdown-toggle:hover { color: var(--heading); }
.nav-dropdown-toggle svg {
  width: 12px; height: 12px; flex-shrink: 0;
  transition: transform var(--transition);
}
.nav-dropdown.open .nav-dropdown-toggle svg { transform: rotate(180deg); }
.nav-dropdown-menu {
  visibility: hidden; opacity: 0; pointer-events: none;
  position: absolute; top: calc(100% + 0.75rem); right: 0;
  background: var(--bg-card); border: 1px solid var(--border); border-radius: 8px;
  padding: 0.5rem 0; min-width: 160px;
  box-shadow: 0 8px 24px rgba(0,0,0,0.25);
  z-index: 200;
  transition: opacity var(--transition), visibility var(--transition);
}
.nav-dropdown.open .nav-dropdown-menu {
  visibility: visible; opacity: 1; pointer-events: auto;
}
.nav-dropdown-menu a {
  display: block; padding: 0.5rem 1rem;
  font-size: 0.85rem; color: var(--text-muted);
  transition: background var(--transition), color var(--transition);
}
.nav-dropdown-menu a:hover {
  background: var(--border); color: var(--heading); opacity: 1;
}

/* ── Hamburger ── */
.hamburger {
  display: none; background: none; border: none; cursor: pointer;
  flex-direction: column; gap: 5px; padding: 4px; z-index: 110;
}
.hamburger span {
  display: block; width: 22px; height: 2px; background: var(--text);
  transition: transform var(--transition), opacity var(--transition);
}
.hamburger.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ── Theme Toggle ── */
.theme-toggle {
  background: none; border: 1px solid var(--border); border-radius: 6px;
  padding: 6px; cursor: pointer; color: var(--text-muted);
  display: flex; align-items: center; justify-content: center;
  transition: color var(--transition), border-color var(--transition);
}
.theme-toggle:hover { color: var(--heading); border-color: var(--text-muted); }
[data-theme="dark"] .icon-moon { display: none; }
[data-theme="light"] .icon-sun { display: none; }

/* ── Hero ── */
.hero {
  min-height: 100vh; display: flex; align-items: center;
  padding-top: 3.5rem;
}
.hero-title { font-size: clamp(2.25rem, 6vw, 3.5rem); font-weight: 700; margin-bottom: 0.75rem; }
.hero-subtitle { color: var(--text-muted); font-size: clamp(0.95rem, 2vw, 1.1rem); margin-bottom: 2rem; }
.hero-ctas { display: flex; gap: 1rem; flex-wrap: wrap; }

/* Blinking cursor */
.cursor {
  font-weight: 400; color: var(--accent);
  animation: blink 1s step-end infinite;
}
@keyframes blink { 0%, 100% { opacity: 1; } 50% { opacity: 0; } }

/* ── Buttons ── */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 0.65rem 1.5rem; border-radius: 6px; font-size: 0.9rem;
  font-weight: 500; transition: background var(--transition), border-color var(--transition);
  cursor: pointer; border: 1px solid transparent;
}
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { opacity: 0.9; }
.btn-outline {
  background: transparent; border-color: var(--border); color: var(--text);
}
.btn-outline:hover { border-color: var(--text-muted); }

/* ── Sections ── */
.section { padding: 5rem 0; }
.section-title {
  font-size: 1.5rem; margin-bottom: 2rem;
  padding-bottom: 0.5rem; border-bottom: 2px solid var(--accent);
  display: inline-block;
}

/* ── Cards ── */
.card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: 8px; padding: 1.5rem; margin-bottom: 1.25rem;
  transition: background var(--transition), border-color var(--transition);
}
.card p { margin-bottom: 0.75rem; }
.card p:last-child { margin-bottom: 0; }
.card-header { margin-bottom: 0.75rem; }
.card-header h3 { font-size: 1.05rem; margin-bottom: 0.25rem; }
.card-meta { font-size: 0.85rem; color: var(--text-muted); }

/* ── Skills Grid ── */
.skills-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.25rem; }
.skills-grid h3 {
  font-size: 0.95rem; color: var(--accent-green);
  margin-bottom: 0.75rem; text-transform: uppercase; letter-spacing: 0.05em;
}
.skill-list { list-style: none; }
.skill-list li {
  font-size: 0.9rem; padding: 0.25rem 0;
  color: var(--text);
}
.skill-list li::before {
  content: ">";
  font-family: var(--font-mono); color: var(--accent); margin-right: 0.5rem;
}

/* ── Projects Grid ── */
.projects-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.25rem; }
.projects-loading { font-size: 0.9rem; color: var(--text-muted); grid-column: 1 / -1; }
.project-card {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: 8px;
  padding: 1.25rem; display: flex; flex-direction: column;
  transition: border-color var(--transition), background var(--transition);
}
.project-card:hover { border-color: var(--accent); }
.project-card h3 {
  font-size: 0.95rem; margin-bottom: 0.5rem;
  display: flex; align-items: center; gap: 0.5rem;
}
.project-card h3 svg { flex-shrink: 0; color: var(--text-muted); }
.project-card h3 a { color: var(--heading); }
.project-card h3 a:hover { color: var(--accent); opacity: 1; }
.project-desc { font-size: 0.85rem; color: var(--text-muted); margin-bottom: auto; padding-bottom: 0.75rem; }
.project-meta { display: flex; align-items: center; gap: 1rem; font-size: 0.8rem; color: var(--text-muted); }
.project-lang {
  display: flex; align-items: center; gap: 0.35rem;
}
.lang-dot {
  width: 10px; height: 10px; border-radius: 50%; display: inline-block;
}

/* ── Write-up Cards ── */
.writeups-grid {
  display: grid; gap: 1.25rem;
}
.writeup-card {
  display: block;
  background: var(--bg-card); border: 1px solid var(--border); border-radius: 8px;
  padding: 1.25rem;
  transition: border-color var(--transition), background var(--transition);
  color: var(--text);
}
.writeup-card:hover { border-color: var(--accent); opacity: 1; }
.writeup-card h3 {
  font-size: 1.05rem; margin-bottom: 0.5rem; color: var(--heading);
}
.writeup-card p {
  font-size: 0.85rem; color: var(--text-muted); margin-bottom: 0.75rem;
  line-height: 1.5;
}
.writeup-card-header {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 0.6rem;
}
.writeup-date { font-size: 0.8rem; color: var(--text-muted); }
.writeup-tag {
  display: inline-block; font-size: 0.7rem; font-weight: 600;
  font-family: var(--font-mono); text-transform: uppercase; letter-spacing: 0.05em;
  padding: 0.2em 0.6em; border-radius: 4px;
  background: rgba(88, 166, 255, 0.12); color: var(--accent);
}
.tag-ctf { background: rgba(88, 166, 255, 0.12); color: var(--accent); }
.tag-hardening { background: rgba(63, 185, 80, 0.12); color: var(--accent-green); }
.tag-security-analysis { background: rgba(210, 153, 34, 0.12); color: #d29922; }
.writeup-read-more {
  font-size: 0.8rem; color: var(--accent); font-weight: 500;
}
.writeups-view-all {
  display: inline-block; margin-top: 1.5rem; font-size: 0.9rem;
  color: var(--accent); font-weight: 500;
}
.blog-back {
  display: inline-block; font-size: 0.85rem; color: var(--text-muted);
  margin-bottom: 1.5rem;
}
.blog-back:hover { color: var(--accent); opacity: 1; }

/* ── Certifications ── */
.cert-list { list-style: none; }
.cert-list li {
  display: flex; justify-content: space-between; align-items: baseline;
  padding: 0.6rem 0; border-bottom: 1px solid var(--border);
  gap: 1rem;
}
.cert-list li:last-child { border-bottom: none; }
.cert-name { font-size: 0.9rem; }
.cert-date { font-size: 0.8rem; color: var(--text-muted); white-space: nowrap; }

/* ── Contact ── */
.contact-links { display: flex; flex-direction: column; gap: 1rem; }
.contact-link {
  display: flex; align-items: center; gap: 0.75rem;
  color: var(--text); font-size: 0.95rem;
}
.contact-link:hover { color: var(--accent); }
.contact-link svg { flex-shrink: 0; color: var(--accent); }

/* ── Footer ── */
.footer {
  padding: 2rem 0; text-align: center;
  border-top: 1px solid var(--border);
  font-size: 0.85rem; color: var(--text-muted);
}

/* ── Fade-in animation ── */
.fade-in {
  opacity: 0; transform: translateY(20px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}
.fade-in.visible {
  opacity: 1; transform: translateY(0);
}

/* ── Responsive ── */
@media (max-width: 640px) {
  .hamburger { display: flex; }
  .nav-links {
    position: fixed; top: 0; right: -100%; width: 70%; height: 100vh;
    flex-direction: column; justify-content: center;
    background: var(--bg); border-left: 1px solid var(--border);
    transition: right 0.3s ease; padding: 2rem;
    gap: 1.75rem;
  }
  .nav-links.open { right: 0; }
  .nav-links a { font-size: 1.1rem; }
  /* Flatten dropdown in mobile menu */
  .nav-dropdown { display: contents; }
  .nav-dropdown-toggle { display: none; }
  .nav-dropdown-menu {
    visibility: visible; opacity: 1; pointer-events: auto;
    position: static; display: contents;
    background: none; border: none; box-shadow: none; padding: 0; min-width: 0;
  }
  .nav-dropdown-menu a {
    display: block; padding: 0; font-size: 1.1rem;
    color: var(--text-muted); background: none;
  }
  .skills-grid { grid-template-columns: 1fr; }
  .projects-grid { grid-template-columns: 1fr; }
  .cert-list li { flex-direction: column; gap: 0.15rem; }
}