/* ===== Base Reset & Variables ===== */
:root {
  --bg: #0f1117;
  --bg-card: #181b25;
  --bg-elevated: #1e2130;
  --text: #e4e6ed;
  --text-muted: #9298ae;
  --accent: #4f9cf7;
  --accent-hover: #6fb3ff;
  --accent-subtle: rgba(79, 156, 247, .08);
  --border: #262a3a;
  --radius: 12px;
  --shadow: 0 8px 32px rgba(0,0,0,.3);
  --maxw: 1100px;
  --font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, monospace;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font: 16px/1.65 var(--font);
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; transition: color .15s; }
a:hover { color: var(--accent-hover); }
img { max-width: 100%; display: block; }

/* ===== Layout ===== */
.container { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

/* ===== Navigation ===== */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(15, 17, 23, .85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 0;
}
.nav-brand {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--text);
}
.nav-brand:hover { color: var(--accent); text-decoration: none; }
.nav-links { display: flex; gap: 28px; list-style: none; margin: 0; padding: 0; }
.nav-links a {
  color: var(--text-muted);
  font-size: .92rem;
  font-weight: 500;
  transition: color .15s;
}
.nav-links a:hover,
.nav-links a.active { color: var(--accent); }

/* Mobile nav */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text);
  font-size: 1.5rem;
  cursor: pointer;
}
@media (max-width: 680px) {
  .nav-toggle { display: block; }
  .nav-links {
    display: none;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg-card);
    border-bottom: 1px solid var(--border);
    padding: 16px 24px;
    gap: 12px;
  }
  .nav-links.open { display: flex; }
}

/* ===== Hero ===== */
.hero {
  padding: 80px 0 60px;
  text-align: center;
}
.hero h1 {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  margin: 0 0 12px;
  letter-spacing: -.02em;
}
.hero .subtitle {
  font-size: 1.15rem;
  color: var(--text-muted);
  margin: 0 0 28px;
  max-width: 640px;
  margin-left: auto;
  margin-right: auto;
}
.hero-cta {
  display: inline-flex;
  gap: 12px;
  flex-wrap: wrap;
  justify-content: center;
}
.btn {
  display: inline-block;
  padding: 12px 24px;
  border-radius: 8px;
  font-weight: 600;
  font-size: .95rem;
  transition: all .15s;
  border: 1px solid transparent;
}
.btn-primary {
  background: var(--accent);
  color: #0f1117;
}
.btn-primary:hover { background: var(--accent-hover); text-decoration: none; }
.btn-outline {
  border-color: var(--border);
  color: var(--text-muted);
}
.btn-outline:hover { border-color: var(--accent); color: var(--accent); text-decoration: none; }

/* ===== Sections ===== */
.section {
  padding: 60px 0;
}
.section-title {
  font-size: 1.6rem;
  font-weight: 700;
  margin: 0 0 8px;
}
.section-subtitle {
  color: var(--text-muted);
  margin: 0 0 32px;
  font-size: 1rem;
}

/* ===== Cards Grid ===== */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 20px;
}
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: border-color .15s, transform .12s;
}
.card:hover {
  border-color: rgba(79, 156, 247, .3);
  transform: translateY(-2px);
}
.card h3 { margin: 0 0 8px; font-size: 1.05rem; }
.card p { margin: 0; color: var(--text-muted); font-size: .92rem; }
.card .meta {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
  font-size: .82rem;
  color: var(--text-muted);
}
.card .tag {
  display: inline-block;
  padding: 3px 8px;
  border-radius: 4px;
  background: var(--accent-subtle);
  color: var(--accent);
  font-size: .78rem;
  font-weight: 500;
  margin-right: 6px;
  margin-top: 10px;
}

/* ===== Resume / Timeline ===== */
.timeline { list-style: none; padding: 0; margin: 0; }
.timeline-item {
  position: relative;
  padding: 0 0 40px 32px;
  border-left: 2px solid var(--border);
}
.timeline-item:last-child { padding-bottom: 0; }
.timeline-item::before {
  content: '';
  position: absolute;
  left: -6px;
  top: 6px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--bg);
}
.timeline-item h3 { margin: 0 0 2px; font-size: 1.05rem; }
.timeline-item .company { color: var(--accent); font-weight: 500; margin: 0 0 4px; }
.timeline-item .dates { color: var(--text-muted); font-size: .85rem; margin: 0 0 8px; }
.timeline-item p { margin: 0; color: var(--text-muted); font-size: .92rem; }

/* ===== Skills / Certs ===== */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 16px;
}
.skill-group h4 {
  margin: 0 0 8px;
  font-size: .88rem;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--text-muted);
}
.skill-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.skill-pill {
  padding: 5px 12px;
  border-radius: 6px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  font-size: .82rem;
  color: var(--text);
}

/* ===== Blog Article View ===== */
.article-view {
  max-width: 780px;
  margin: 0 auto;
  padding: 40px 0 80px;
}
.article-view h1 {
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  margin: 0 0 12px;
}
.article-view .article-meta {
  color: var(--text-muted);
  font-size: .9rem;
  margin-bottom: 32px;
}
.article-view .article-body h2 { margin-top: 2em; font-size: 1.3rem; }
.article-view .article-body h3 { margin-top: 1.5em; font-size: 1.1rem; }
.article-view .article-body p { margin-bottom: 1em; }
.article-view .article-body ul,
.article-view .article-body ol { margin-bottom: 1em; padding-left: 1.5em; }
.article-view .article-body li { margin-bottom: .4em; }
.article-view .article-body hr { border: none; border-top: 1px solid var(--border); margin: 2em 0; }
.article-view .article-body a { text-decoration: underline; }

/* ===== Footer ===== */
.footer {
  border-top: 1px solid var(--border);
  padding: 32px 0;
  text-align: center;
  color: var(--text-muted);
  font-size: .88rem;
}

/* ===== Utility ===== */
.hide { display: none !important; }
.text-center { text-align: center; }