:root {
  --bg: #0a0c10;
  --bg-card: #11151c;
  --bg-card-hover: #161b24;
  --border: #1e2530;
  --text: #e8edf5;
  --text-muted: #8b95a8;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --accent-soft: rgba(59, 130, 246, 0.12);
  --cyan: #22d3ee;
  --green: #22c55e;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.35);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

img {
  max-width: 100%;
  display: block;
}

.container {
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

main {
  flex: 1;
}

/* ========== HEADER ========== */
header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 12, 16, 0.88);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.logo {
  display: flex;
  align-items: center;
  height: 36px;
}

.logo img {
  height: 36px;
  width: auto;
}

nav {
  display: flex;
  align-items: center;
  gap: 26px;
}

nav a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: color 0.2s;
}

nav a:hover,
nav a.active {
  color: var(--text);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}

.linkedin-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 8px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-muted);
  transition: all 0.2s;
}

.linkedin-link:hover {
  color: #0a66c2;
  border-color: #0a66c2;
}

.linkedin-link svg {
  width: 18px;
  height: 18px;
}

.lang-switch {
  display: flex;
  gap: 3px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 3px;
}

.lang-btn {
  border: none;
  background: transparent;
  color: var(--text-muted);
  font-size: 0.78rem;
  font-weight: 600;
  padding: 5px 11px;
  border-radius: 999px;
  cursor: pointer;
  transition: all 0.2s;
  font-family: inherit;
}

.lang-btn.active {
  background: var(--accent);
  color: #fff;
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text);
  font-size: 1.4rem;
  cursor: pointer;
  line-height: 1;
}

/* ========== HERO ========== */
.hero {
  padding: 100px 0 80px;
  text-align: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 0.85rem;
  font-weight: 600;
  padding: 6px 14px;
  border-radius: 999px;
  margin-bottom: 24px;
}

.hero h1 {
  font-size: clamp(2.4rem, 6vw, 3.6rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin-bottom: 16px;
}

.hero h1 span {
  color: var(--accent);
}

.hero-desc {
  max-width: 560px;
  margin: 0 auto 40px;
  color: var(--text-muted);
  font-size: 1.1rem;
}

.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  max-width: 800px;
  margin: 0 auto;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 12px;
  transition: border-color 0.2s, background 0.2s;
}

.stat-card:hover {
  border-color: var(--accent);
  background: var(--bg-card-hover);
}

.stat-value {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 4px;
}

.stat-label {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ========== SECTIONS ========== */
section {
  padding: 80px 0;
}

.section-eyebrow {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin-bottom: 10px;
}

.section-title {
  font-size: clamp(1.7rem, 4vw, 2.2rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}

.section-desc {
  color: var(--text-muted);
  max-width: 640px;
  margin-bottom: 40px;
  font-size: 1.05rem;
}

/* ========== ABOUT / SKILLS ========== */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.skill-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: all 0.2s;
}

.skill-card:hover {
  border-color: var(--accent);
  background: var(--bg-card-hover);
  transform: translateY(-2px);
}

.skill-num {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 10px;
}

.skill-card h3 {
  font-size: 1.05rem;
  font-weight: 600;
}

/* ========== CERTS ========== */
.certs-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}

.cert-card {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  transition: border-color 0.2s;
}

.cert-card:hover {
  border-color: var(--accent);
}

.cert-badge {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  background: var(--accent-soft);
  color: var(--accent);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  font-weight: 700;
  text-align: center;
  line-height: 1.2;
}

.cert-info h3 {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 4px;
}

.cert-info p {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.cert-link {
  font-size: 0.8rem;
  color: var(--accent);
  font-weight: 500;
}

.cert-link:hover {
  text-decoration: underline;
}

.certs-note {
  margin-top: 24px;
  font-size: 0.9rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 8px;
}

.certs-note::before {
  content: '';
  width: 8px;
  height: 8px;
  background: var(--green);
  border-radius: 50%;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

/* ========== COURSES ========== */
.courses-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.course-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: all 0.2s;
}

.course-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.course-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 3px 10px;
  border-radius: 6px;
  margin-bottom: 14px;
}

.course-card h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.course-meta {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ========== STACK ========== */
.stack-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.stack-group h3 {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 12px;
}

.stack-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.stack-tag {
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text);
  font-size: 0.85rem;
  font-weight: 500;
  padding: 6px 12px;
  border-radius: 999px;
  transition: border-color 0.2s, background 0.2s;
}

.stack-tag:hover {
  border-color: var(--accent);
  background: var(--bg-card-hover);
}

/* ========== BLOG ========== */
.blog-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.blog-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  display: flex;
  flex-direction: column;
  transition: all 0.2s;
}

.blog-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.blog-meta {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.blog-card h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 10px;
  line-height: 1.4;
}

.blog-card p {
  font-size: 0.9rem;
  color: var(--text-muted);
  flex-grow: 1;
  margin-bottom: 16px;
}

.blog-link {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent);
}

.blog-link:hover {
  text-decoration: underline;
}

/* ========== CTA ========== */
.cta {
  padding: 80px 0;
  text-align: center;
}

.cta-box {
  background: linear-gradient(135deg, var(--bg-card) 0%, #0f1520 100%);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 48px 32px;
}

.cta-box h2 {
  font-size: clamp(1.5rem, 3.5vw, 1.9rem);
  font-weight: 700;
  margin-bottom: 12px;
}

.cta-box p {
  color: var(--text-muted);
  margin-bottom: 28px;
  max-width: 480px;
  margin-left: auto;
  margin-right: auto;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--accent);
  color: #fff;
  font-weight: 600;
  font-size: 0.95rem;
  padding: 12px 28px;
  border-radius: 999px;
  border: none;
  cursor: pointer;
  transition: background 0.2s, transform 0.15s;
  font-family: inherit;
}

.btn:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
}

.btn-outline {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
}

.btn-outline:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
  color: var(--accent);
}

/* ========== PAGE HERO (subpages) ========== */
.page-hero {
  padding: 70px 0 40px;
  text-align: center;
  border-bottom: 1px solid var(--border);
  margin-bottom: 20px;
}

.page-hero .section-eyebrow {
  margin-bottom: 12px;
}

.page-hero h1 {
  font-size: clamp(1.9rem, 4.5vw, 2.6rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}

.page-hero p {
  color: var(--text-muted);
  max-width: 520px;
  margin: 0 auto;
  font-size: 1.05rem;
}

/* ========== CONTACT ========== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 40px;
  align-items: start;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.info-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
}

.info-card h3 {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.info-card p,
.info-card a {
  font-size: 1.05rem;
  font-weight: 500;
}

.info-card a:hover {
  color: var(--accent);
}

.social-links {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.social-links a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-weight: 500;
  transition: all 0.2s;
}

.social-links a:hover {
  border-color: var(--accent);
  background: var(--bg-card-hover);
}

.contact-form {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
}

.form-group {
  margin-bottom: 18px;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 500;
  margin-bottom: 6px;
  color: var(--text-muted);
}

.form-group input,
.form-group textarea {
  width: 100%;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  color: var(--text);
  font-size: 0.95rem;
  font-family: inherit;
  transition: border-color 0.2s;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--accent);
}

.form-group textarea {
  min-height: 140px;
  resize: vertical;
}

/* ========== FOOTER ========== */
footer {
  border-top: 1px solid var(--border);
  padding: 28px 0;
  margin-top: auto;
}

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

.footer-copy {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.footer-links {
  display: flex;
  gap: 20px;
}

.footer-links a {
  font-size: 0.85rem;
  color: var(--text-muted);
  transition: color 0.2s;
}

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

/* ========== RESPONSIVE ========== */
@media (max-width: 900px) {
  .stats {
    grid-template-columns: repeat(2, 1fr);
  }
  .skills-grid,
  .courses-grid,
  .blog-grid,
  .stack-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .certs-grid {
    grid-template-columns: 1fr;
  }
  .contact-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 700px) {
  nav {
    display: none;
    position: absolute;
    top: 68px;
    left: 0;
    right: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    padding: 20px 24px;
    gap: 16px;
  }

  nav.open {
    display: flex;
  }

  .menu-toggle {
    display: block;
  }

  .stats {
    grid-template-columns: 1fr 1fr;
  }

  .skills-grid,
  .courses-grid,
  .blog-grid,
  .stack-grid {
    grid-template-columns: 1fr;
  }

  .hero {
    padding: 70px 0 60px;
  }

  .logo img {
    height: 30px;
  }
}