:root {
  --bg: #07111d;
  --bg-elevated: #0d1727;
  --bg-soft: #101d2f;
  --panel: rgba(15, 23, 36, 0.82);
  --panel-strong: #121d2e;
  --border: rgba(148, 163, 184, 0.16);
  --text: #e5edf8;
  --muted: #a9b7c7;
  --subtle: #7d8ea7;
  --primary: #f97316;
  --primary-2: #fdba74;
  --secondary: #38bdf8;
  --secondary-2: #7dd3fc;
  --success: #34d399;
  --shadow: 0 24px 48px rgba(2, 6, 23, 0.5);
  --radius: 20px;
  --container: min(1180px, calc(100% - 2rem));
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: 'Inter', 'Segoe UI', sans-serif;
  background:
    radial-gradient(circle at top left, rgba(56, 189, 248, 0.18), transparent 28%),
    radial-gradient(circle at top right, rgba(249, 115, 22, 0.15), transparent 30%),
    var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}

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

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

button,
input,
select {
  font: inherit;
}

.container {
  width: var(--container);
  margin: 0 auto;
}

.section {
  padding: 5rem 0;
}

.section-header {
  max-width: 700px;
  margin-bottom: 2.5rem;
}

.section-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.72rem;
  color: var(--secondary-2);
  margin-bottom: 1rem;
}

.section-eyebrow::before {
  content: "";
  width: 28px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--primary));
}

h1, h2, h3, h4 {
  margin: 0 0 1rem;
  line-height: 1.15;
  letter-spacing: -0.04em;
}

h1 {
  font-size: clamp(2.7rem, 5vw, 5rem);
}

h2 {
  font-size: clamp(2rem, 3vw, 3rem);
}

h3 {
  font-size: clamp(1.2rem, 2vw, 1.6rem);
}

p {
  margin: 0 0 1rem;
  color: var(--muted);
}

.small-text {
  color: var(--subtle);
  font-size: 0.9rem;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  backdrop-filter: blur(12px);
  background: rgba(7, 17, 29, 0.74);
  border-bottom: 1px solid var(--border);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 76px;
  gap: 1rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.8rem;
  font-weight: 700;
  letter-spacing: -0.03em;
}

.brand-mark {
  width: 38px;
  height: 38px;
  display: inline-grid;
  place-items: center;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: white;
  font-weight: 800;
  box-shadow: 0 10px 22px rgba(249, 115, 22, 0.35);
}

.nav {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.nav a {
  position: relative;
  color: var(--muted);
  font-size: 0.92rem;
  padding: 0.5rem 0.35rem;
  transition: color 0.2s ease;
}

.nav a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -0.2rem;
  height: 2px;
  background: linear-gradient(90deg, var(--secondary), var(--primary));
  transform: scaleX(0);
  transform-origin: center;
  transition: transform 0.25s ease;
}

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

.nav a:hover::after,
.nav a.active::after {
  transform: scaleX(1);
}

.lang-switcher {
  display: inline-flex;
  border: 1px solid var(--border);
  background: rgba(9, 17, 29, 0.45);
  border-radius: 999px;
  padding: 0.2rem;
}

.lang-switcher button {
  border: none;
  background: transparent;
  color: var(--muted);
  padding: 0.5rem 0.8rem;
  border-radius: 999px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.lang-switcher button.active {
  background: linear-gradient(135deg, rgba(249, 115, 22, 0.18), rgba(56, 189, 248, 0.18));
  color: var(--text);
  box-shadow: inset 0 0 0 1px rgba(125, 211, 252, 0.35);
}

.mobile-menu-toggle {
  display: none;
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 10px;
  width: 42px;
  height: 42px;
  justify-content: center;
  align-items: center;
  cursor: pointer;
}

.hero {
  padding-top: 5rem;
  padding-bottom: 3rem;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(240px, 0.8fr);
  gap: 2rem;
  align-items: center;
}

.hero-copy {
  position: relative;
  z-index: 1;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  border: 1px solid rgba(125, 211, 252, 0.22);
  background: rgba(8, 16, 28, 0.8);
  border-radius: 999px;
  padding: 0.5rem 0.9rem;
  color: var(--secondary-2);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 1rem;
}

.hero-title {
  margin-bottom: 1rem;
}

.text-gradient {
  background: linear-gradient(90deg, var(--secondary-2), var(--primary-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
  margin: 2rem 0 1.5rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  border-radius: 12px;
  border: 1px solid var(--border);
  padding: 0.9rem 1.2rem;
  font-weight: 600;
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.button:hover,
.button:focus-visible {
  transform: translateY(-1px);
  border-color: rgba(255, 255, 255, 0.2);
  box-shadow: 0 10px 30px rgba(3, 7, 18, 0.5);
}

.button.primary {
  border: none;
  background: linear-gradient(135deg, var(--primary), #fb923c);
  color: white;
}

.button.secondary {
  background: rgba(15, 23, 36, 0.8);
  color: var(--text);
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 1.25rem;
}

.hero-stat {
  min-width: 130px;
  padding: 0.8rem 1rem;
  background: rgba(17, 24, 39, 0.76);
  border: 1px solid var(--border);
  border-radius: 14px;
}

.hero-stat strong {
  display: block;
  font-size: 1.1rem;
  color: var(--text);
}

.hero-visual {
  position: relative;
  min-height: 420px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.system-node {
  position: absolute;
  width: 160px;
  height: 160px;
  border-radius: 50%;
  background: radial-gradient(circle at 30% 30%, rgba(125, 211, 252, 0.45), rgba(7, 17, 29, 0.96) 60%);
  border: 1px solid rgba(125, 211, 252, 0.18);
  box-shadow: inset 0 0 25px rgba(125, 211, 252, 0.15), var(--shadow);
  display: grid;
  place-items: center;
  text-align: center;
}

.system-node::before {
  content: "";
  position: absolute;
  inset: 12px;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.node-api {
  top: 10%;
  left: 18%;
}

.node-mq {
  top: 20%;
  right: 10%;
}

.node-db {
  bottom: 10%;
  left: 20%;
}

.node-cloud {
  bottom: 18%;
  right: 14%;
}

.node-core {
  width: 180px;
  height: 180px;
  background: radial-gradient(circle at 35% 30%, rgba(249, 115, 22, 0.25), rgba(7, 17, 29, 0.96) 60%);
  top: 30%;
  left: 50%;
  transform: translateX(-50%);
}

.system-node span {
  position: relative;
  z-index: 1;
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--secondary-2);
}

.flow-lines {
  position: absolute;
  inset: 0;
}

.flow-lines svg {
  width: 100%;
  height: 100%;
  overflow: visible;
}

.flow-lines path {
  fill: none;
  stroke: rgba(125, 211, 252, 0.45);
  stroke-width: 1.6;
  stroke-dasharray: 8 12;
  animation: flow 14s linear infinite;
}

@keyframes flow {
  to {
    stroke-dashoffset: -120;
  }
}

.animated-words {
  display: inline-block;
  min-width: 210px;
  color: var(--primary-2);
  font-weight: 700;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

.grid {
  display: grid;
  gap: 1.5rem;
}

.card {
  background: linear-gradient(180deg, rgba(18, 29, 46, 0.9), rgba(13, 23, 39, 0.88));
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow);
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.card:hover {
  transform: translateY(-3px);
  border-color: rgba(125, 211, 252, 0.25);
}

.about-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 2rem;
  align-items: center;
}

.profile-card {
  position: relative;
  overflow: hidden;
  min-height: 360px;
}

.profile-card .portrait {
  width: 100%;
  height: 100%;
  min-height: 320px;
  object-fit: cover;
  border-radius: 18px;
  background: linear-gradient(135deg, rgba(56, 189, 248, 0.12), rgba(249, 115, 22, 0.12));
}

.profile-badges {
  position: absolute;
  inset: auto 1rem 1rem 1rem;
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
}

.profile-badges span {
  display: inline-flex;
  align-items: center;
  padding: 0.45rem 0.7rem;
  border-radius: 999px;
  background: rgba(7, 17, 29, 0.82);
  border: 1px solid rgba(125, 211, 252, 0.25);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--secondary-2);
}

.specialties-grid,
.stack-grid,
.experience-grid,
.projects-grid,
.articles-grid,
.contact-grid {
  display: grid;
  gap: 1.5rem;
}

.specialties-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.specialty-icon {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  margin-bottom: 1rem;
  display: inline-grid;
  place-items: center;
  font-weight: 800;
  background: linear-gradient(135deg, rgba(56, 189, 248, 0.12), rgba(249, 115, 22, 0.12));
  color: var(--secondary-2);
}

.stack-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.stack-category {
  padding: 1.5rem;
}

.stack-category h3 {
  margin-bottom: 1rem;
  font-size: 1.2rem;
}

.tech-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}

.tech-pill {
  display: inline-flex;
  align-items: center;
  padding: 0.52rem 0.8rem;
  border-radius: 999px;
  background: rgba(15, 23, 36, 0.9);
  border: 1px solid rgba(148, 163, 184, 0.12);
  color: var(--text);
  font-size: 0.82rem;
  transition: background 0.2s ease, border-color 0.2s ease;
}

.tech-pill:hover {
  background: rgba(37, 99, 235, 0.12);
  border-color: rgba(56, 189, 248, 0.26);
}

.timeline {
  display: grid;
  gap: 1rem;
}

.timeline-item {
  position: relative;
  padding: 1.5rem 1.5rem 1.5rem 3.75rem;
}

.timeline-item::before {
  content: "";
  position: absolute;
  left: 1.25rem;
  top: 1.75rem;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--secondary), var(--primary));
  box-shadow: 0 0 0 6px rgba(56, 189, 248, 0.1);
}

.timeline-item::after {
  content: "";
  position: absolute;
  left: 1.8rem;
  top: 2.6rem;
  bottom: -1rem;
  width: 1px;
  background: rgba(148, 163, 184, 0.2);
}

.timeline-item:last-child::after {
  display: none;
}

.timeline-period {
  display: inline-flex;
  margin-bottom: 0.5rem;
  color: var(--secondary-2);
  font-size: 0.85rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.timeline-role {
  margin-bottom: 0.4rem;
}

.project-card {
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.project-image {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  background: linear-gradient(135deg, rgba(14, 116, 144, 0.18), rgba(249, 115, 22, 0.12));
}

.project-content {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  padding: 1.25rem 1.25rem 1.4rem;
}

.project-meta,
.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  align-items: center;
}

.project-tag,
.article-tag {
  display: inline-flex;
  align-items: center;
  padding: 0.35rem 0.62rem;
  border-radius: 999px;
  background: rgba(125, 211, 252, 0.08);
  color: var(--secondary-2);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  border: 1px solid rgba(125, 211, 252, 0.12);
}

.project-actions {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-top: auto;
}

.inline-link {
  color: var(--secondary-2);
}

.articles-toolbar {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.search-box {
  flex: 1;
  min-width: 220px;
}

.search-box input,
.search-box select {
  width: 100%;
  padding: 0.8rem 1rem;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: rgba(9, 17, 29, 0.7);
  color: var(--text);
}

.filter-box {
  min-width: 180px;
}

.article-card {
  overflow: hidden;
  display: flex;
  flex-direction: column;
  min-height: 100%;
}

.article-card .article-image {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  background: linear-gradient(135deg, rgba(249, 115, 22, 0.12), rgba(56, 189, 248, 0.12));
}

.article-content {
  padding: 1.25rem 1.25rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
  flex: 1;
}

.article-card .meta-row {
  display: flex;
  justify-content: space-between;
  gap: 0.75rem;
  color: var(--muted);
  font-size: 0.78rem;
}

.article-card h3 {
  margin-bottom: 0;
}

.article-card .read-more {
  margin-top: auto;
  font-weight: 600;
  color: var(--secondary-2);
}

.badge {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  padding: 0.38rem 0.65rem;
  font-size: 0.7rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  border: 1px solid rgba(249, 115, 22, 0.2);
  background: rgba(249, 115, 22, 0.08);
  color: var(--primary-2);
}

.education-list {
  display: grid;
  gap: 1rem;
}

.credly-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(130px, 1fr));
  gap: 1rem;
  align-items: center;
  justify-items: center;
}

.contact-grid {
  grid-template-columns: 1.1fr 0.9fr;
  align-items: start;
}

.contact-list {
  display: grid;
  gap: 0.9rem;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  padding: 1rem 1.1rem;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: rgba(11, 17, 29, 0.54);
}

.contact-icon {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  display: inline-grid;
  place-items: center;
  background: linear-gradient(135deg, rgba(56, 189, 248, 0.12), rgba(249, 115, 22, 0.12));
  color: var(--secondary-2);
  font-weight: 800;
}

.site-footer {
  border-top: 1px solid var(--border);
  background: rgba(7, 17, 29, 0.82);
  padding: 2rem 0 2.5rem;
}

.site-footer .container {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: center;
}

.footer-nav {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 1rem;
  color: var(--muted);
}

.to-top {
  position: fixed;
  right: 1.1rem;
  bottom: 1.1rem;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border: none;
  color: white;
  font-size: 1.2rem;
  box-shadow: var(--shadow);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: all 0.2s ease;
}

.to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.hidden {
  display: none !important;
}

.article-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 260px;
  gap: 2rem;
  align-items: start;
}

.article-shell {
  background: rgba(11, 17, 29, 0.7);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  box-shadow: var(--shadow);
}

.article-shell article {
  color: var(--text);
}

.article-shell h1,
.article-shell h2,
.article-shell h3,
.article-shell h4 {
  margin-top: 2rem;
  margin-bottom: 0.9rem;
  letter-spacing: -0.03em;
}

.article-shell p,
.article-shell li,
.article-shell blockquote {
  color: var(--muted);
}

.article-shell pre {
  overflow: auto;
  padding: 1rem 1.1rem;
  border-radius: 12px;
  background: rgba(2, 6, 23, 0.7);
  border: 1px solid var(--border);
}

.article-shell code {
  font-family: 'SFMono-Regular', Consolas, monospace;
  font-size: 0.9em;
}

.article-shell blockquote {
  padding: 1rem 1.2rem;
  border-left: 3px solid var(--primary);
  background: rgba(249, 115, 22, 0.06);
  border-radius: 14px;
  margin: 1.25rem 0;
}

.article-shell img {
  border-radius: 16px;
  border: 1px solid var(--border);
  margin: 1.25rem 0;
}

.article-shell ul,
.article-shell ol {
  padding-left: 1.3rem;
}

.toc {
  position: sticky;
  top: 92px;
  background: rgba(12, 19, 30, 0.8);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 1rem 1rem 0.9rem;
}

.toc ol {
  margin: 0.7rem 0 0;
  padding-left: 1.2rem;
}

.toc a {
  color: var(--muted);
}

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

.featured-article {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.2fr);
  overflow: hidden;
  margin-bottom: 2rem;
  border-color: var(--primary);
}

.featured-article > img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  background: #0b111d;
}

.featured-article-content { padding: 2rem; }
.featured-article-content h3 { font-size: clamp(1.4rem, 2.5vw, 2rem); margin: 1rem 0; }
.featured-article-content .button { margin-top: 1rem; }
.article-shell { min-width: 0; overflow-wrap: anywhere; }
.article-shell h2, .article-shell h3 { scroll-margin-top: 100px; }
.article-shell figure { margin: 1.5rem 0; }
.article-shell figcaption { color: var(--muted); font-size: 0.9rem; }
.article-table { overflow-x: auto; margin: 1.5rem 0; }
.article-table table { width: 100%; border-collapse: collapse; min-width: 440px; }
.article-table th, .article-table td {
  padding: 0.8rem;
  border: 1px solid var(--border);
  text-align: left;
  vertical-align: top;
}
.article-table th { background: rgba(249, 115, 22, 0.08); }
.toc { max-height: calc(100vh - 120px); overflow-y: auto; }

@media (max-width: 980px) {
  .featured-article { grid-template-columns: 1fr; }
  .featured-article > img { height: auto; }
  .article-layout > .toc { position: static; grid-row: 1; max-height: 260px; }
  .hero-grid,
  .about-grid,
  .contact-grid,
  .article-layout {
    grid-template-columns: 1fr;
  }

  .specialties-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .nav {
    display: none;
  }

  .nav.open {
    display: flex;
    position: absolute;
    flex-direction: column;
    left: 1rem;
    right: 1rem;
    top: calc(100% + 0.8rem);
    background: rgba(7, 17, 29, 0.96);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 1rem;
    box-shadow: var(--shadow);
  }

  .mobile-menu-toggle {
    display: inline-flex;
  }
}

@media (max-width: 640px) {
  .section {
    padding: 4rem 0;
  }

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

  .hero-actions,
  .articles-toolbar,
  .project-actions,
  .site-footer .container {
    flex-direction: column;
    align-items: stretch;
  }

  .hero-meta {
    gap: 0.75rem;
  }

  .site-header .container {
    min-height: 68px;
  }

  .article-shell {
    padding: 1.2rem;
  }
}