/* =====================================================
   Premium cybersecurity portfolio — dark mode only
   Background: #000000 · Accent: #FF5C5C · Minimal & clean
   ===================================================== */

:root {
  --bg: #000000;
  --bg-card: #0d0d0d;
  --text: #ffffff;
  --muted: #bfbfbf;
  --accent: #ff5c5c;
  --border: #1c1c1c;
  --radius: 12px;
  --font-head: 'Poppins', 'Inter', sans-serif;
  --font-body: 'Inter', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}
h1, h2, h3 { font-family: var(--font-head); line-height: 1.18; }
a { color: inherit; text-decoration: none; }
button { font: inherit; }
.mono { font-family: var(--font-mono); }
.accent { color: var(--accent); }
.cursor { color: var(--accent); }

/* ---------- Language toggle ---------- */
.lang-en { display: none; }
body.lang-en .lang-en { display: block; }
body.lang-en .lang-vi { display: none; }
div.chips.lang-en { display: none; }
body.lang-en div.chips.lang-en { display: flex; }
body.lang-en div.chips.lang-vi { display: none; }

/* ---------- Navbar ---------- */
.navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  display: grid; grid-template-columns: 1fr auto 1fr; align-items: center;
  padding: 22px 56px;
  background: rgba(0, 0, 0, .92);
  border-bottom: 1px solid var(--border);
}

.nav-links { display: flex; gap: 30px; }
.nav-links a {
  font-size: 14px; font-weight: 500; color: var(--muted);
  position: relative; transition: color .25s;
}
.nav-links a::after {
  content: ''; position: absolute; left: 0; bottom: -6px;
  width: 0; height: 2px; background: var(--accent); transition: width .25s;
}
.nav-links a:hover { color: var(--text); }
.nav-links a:hover::after { width: 100%; }

.logo {
  display: inline-flex; align-items: center; gap: 9px;
  font-family: var(--font-head); font-weight: 700; font-size: 19px;
  letter-spacing: 1px; justify-self: center;
}
.logo svg { color: var(--accent); }

.nav-actions { display: flex; align-items: center; gap: 14px; justify-self: end; }
.social { color: var(--muted); display: inline-flex; transition: color .25s, transform .25s; }
.social:hover { color: var(--accent); transform: translateY(-2px); }
.nav-sep { width: 1px; height: 18px; background: var(--border); }

.btn-icon {
  background: transparent; border: 1px solid var(--border); color: var(--muted);
  width: 34px; height: 30px; border-radius: 6px; cursor: pointer;
  font-size: 13px; transition: color .25s, border-color .25s;
}
.btn-icon:hover { color: var(--text); border-color: var(--accent); }
.menu-toggle { display: none; font-size: 18px; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-block; padding: 13px 30px; border-radius: 6px;
  font-weight: 600; font-size: 15px; cursor: pointer;
  transition: transform .25s, background .25s, border-color .25s, color .25s;
  border: none;
}
.btn-primary { background: var(--accent); color: #ffffff; }
.btn-primary:hover { transform: translateY(-2px); background: #ff7373; }
.btn-outline { background: transparent; border: 1px solid #333333; color: var(--text); }
.btn-outline:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-2px); }

/* ---------- Hero ---------- */
.hero {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 1.15fr .85fr;
  align-items: center;
  padding: 150px 8% 70px;
  gap: 50px;
  max-width: 1380px;
  margin: 0 auto;
}

.greeting {
  color: var(--accent); font-weight: 600; font-size: 15px;
  letter-spacing: 1.5px; text-transform: uppercase; margin-bottom: 18px;
}
.hero h1 {
  font-size: clamp(38px, 4.6vw, 64px);
  font-weight: 800;
  letter-spacing: -1px;
  margin-bottom: 20px;
}
.hero-role { font-size: clamp(17px, 1.6vw, 21px); font-weight: 500; color: var(--text); margin-bottom: 16px; max-width: 560px; }
.hero-intro { color: var(--muted); max-width: 560px; margin-bottom: 36px; font-size: 16px; }
.hero-cta { display: flex; gap: 16px; flex-wrap: wrap; }

.hero-right { display: flex; justify-content: center; }
.soc-art {
  width: 100%; max-width: 440px;
  filter: drop-shadow(0 24px 44px rgba(0, 0, 0, .6));
}

/* ---------- Sections ---------- */
.section { padding: 100px 8%; max-width: 1380px; margin: 0 auto; }
.section-title {
  font-size: clamp(26px, 2.8vw, 38px); font-weight: 700; margin-bottom: 18px;
  display: flex; align-items: baseline; gap: 12px;
}
.section-title .prompt { color: var(--accent); font-family: var(--font-mono); font-size: .75em; }
.section-desc { color: var(--muted); max-width: 720px; margin-bottom: 36px; }
.section > .grid, .section > .about-grid, .section > .lab-grid, .section > .card { margin-top: 28px; }

.about-grid { display: grid; grid-template-columns: 1.5fr 1fr; gap: 44px; align-items: start; }
.about-grid p { color: var(--muted); margin-bottom: 14px; }
.about-grid strong { color: var(--text); }
.interests-chips { margin-top: 22px; }

/* ---------- Cards & grid ---------- */
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(290px, 1fr)); gap: 24px; }
.projects-grid { grid-template-columns: 1fr; max-width: 880px; }
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  transition: transform .3s, border-color .3s;
}
.card:hover { transform: translateY(-4px); border-color: var(--accent); }
.card h3 { font-size: 18px; font-weight: 600; margin-bottom: 12px; }
.card .icon { font-size: 30px; display: block; margin-bottom: 14px; }
.card p { color: var(--muted); font-size: 15px; }
.card .meta { color: var(--accent); font-size: 13.5px; font-weight: 500; margin-bottom: 10px; }
.info-card h3 { margin-top: 18px; }
.info-card h3:first-child { margin-top: 0; }
.info-card p { margin-bottom: 8px; }

.card-link {
  display: inline-block; margin-top: 16px;
  color: var(--accent); font-weight: 600; font-size: 14.5px;
  transition: opacity .25s;
}
.card-link:hover { opacity: .75; }

.tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }
.tag {
  font-size: 12.5px; font-weight: 500; color: var(--accent);
  border: 1px solid rgba(255, 92, 92, .5); border-radius: 4px; padding: 3px 10px;
}

/* ---------- Chips ---------- */
.chips { display: flex; flex-wrap: wrap; gap: 10px; }
.chip {
  font-size: 13.5px; font-weight: 500; color: var(--muted);
  border: 1px solid #2a2a2a; border-radius: 6px; padding: 6px 14px;
  transition: color .25s, border-color .25s;
}
.chip:hover { color: var(--text); border-color: var(--accent); }

/* ---------- Lists ---------- */
.dash-list { list-style: none; margin-top: 6px; }
.dash-list li {
  color: var(--muted); font-size: 15px; padding: 5px 0 5px 22px; position: relative;
}
.dash-list li::before {
  content: '▸'; position: absolute; left: 0; color: var(--accent); font-size: 13px;
}

/* ---------- Home lab ---------- */
.lab-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.lab-grid .chips { margin-top: 8px; }

/* ---------- Experience ---------- */
.xp-card { max-width: 880px; }
.xp-head { display: flex; align-items: baseline; gap: 14px; flex-wrap: wrap; margin-bottom: 14px; }
.xp-head h3 { margin-bottom: 0; font-size: 20px; }
.xp-company { color: var(--accent); font-weight: 600; font-size: 15px; letter-spacing: .5px; }

/* ---------- Learning journey ---------- */
.learning-card { max-width: 760px; }
.progress-row {
  display: flex; justify-content: space-between; align-items: center;
  margin-top: 22px; font-size: 15px; font-weight: 500; color: var(--text);
}
.progress-row:first-child { margin-top: 0; }
.progress-row .mono { color: var(--accent); font-size: 13px; }
.skill-bar {
  height: 6px; border-radius: 3px; background: #1d1d1d;
  margin-top: 8px; overflow: hidden;
}
.skill-bar span { display: block; height: 100%; background: var(--accent); border-radius: 3px; }

/* ---------- Skills (inside cards) ---------- */
.skill-item {
  display: flex; justify-content: space-between; align-items: center;
  margin-top: 14px; font-size: 14.5px; color: var(--text);
}
.skill-item .mono { color: var(--muted); font-size: 12.5px; }

/* ---------- Languages ---------- */
.lang-cards { grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); }

/* ---------- Contact ---------- */
#contact > p { color: var(--muted); margin-bottom: 14px; }
.contact-loc { color: var(--text) !important; font-weight: 500; margin-bottom: 28px !important; }
.contact-links { display: flex; flex-wrap: wrap; gap: 16px; }

/* ---------- Footer ---------- */
.footer {
  border-top: 1px solid var(--border);
  text-align: center; padding: 44px 20px;
  color: var(--muted); font-size: 14px;
}
.footer .tagline { color: var(--text); font-size: 16px; font-style: italic; margin-bottom: 10px; }

/* ---------- Blog post page ---------- */
.post { max-width: 760px; margin: 130px auto 80px; padding: 0 24px; }
.post h1 { font-size: clamp(30px, 4vw, 44px); margin-bottom: 8px; }
.post h2 { font-size: 22px; margin: 30px 0 12px; }
.post p, .post li { color: var(--muted); margin-bottom: 14px; }
.post ul { padding-left: 22px; }
.post strong, .post code { color: var(--text); }
.post .meta { color: var(--muted); font-size: 14px; margin-bottom: 24px; }
.post pre {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: 8px;
  padding: 18px; font-family: var(--font-mono); font-size: 14px;
  overflow-x: auto; margin-bottom: 16px; color: var(--text);
}
.post code { font-family: var(--font-mono); font-size: .92em; }
.back-link { color: var(--accent); font-weight: 600; }

/* ---------- Subtle reveal ---------- */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity .7s ease, transform .7s ease; }
.reveal.visible { opacity: 1; transform: none; }
.hero-right.reveal.visible { transition-delay: .15s; }

/* ---------- Responsive ---------- */
@media (max-width: 1000px) {
  .hero { grid-template-columns: 1fr; text-align: center; padding-top: 130px; gap: 30px; }
  .hero-role, .hero-intro { margin-left: auto; margin-right: auto; }
  .hero-cta { justify-content: center; }
  .soc-art { max-width: 360px; }
  .about-grid, .lab-grid { grid-template-columns: 1fr; }
  .interests-chips, .hero ~ * .chips { justify-content: flex-start; }
}

@media (max-width: 900px) {
  .navbar { display: flex; justify-content: space-between; padding: 18px 24px; }
  .nav-links {
    position: fixed; top: 67px; left: 0; right: 0;
    flex-direction: column; gap: 0;
    background: var(--bg); border-bottom: 1px solid var(--border);
    display: none;
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 15px 28px; border-top: 1px solid var(--border); }
  .nav-links a::after { display: none; }
  .menu-toggle { display: inline-block; }
  .social { display: none; }
  .section { padding: 70px 6%; }
}