:root {
  --bg: #05070b;
  --bg-soft: #0a1018;
  --bg-elevated: #0e1622;
  --panel: rgba(255, 255, 255, 0.035);
  --panel-strong: rgba(255, 255, 255, 0.05);
  --text: #f5f7fb;
  --text-soft: #d8e0ec;
  --muted: #9eabbd;
  --muted-2: #7f8ca0;
  --line: rgba(255, 255, 255, 0.08);
  --line-strong: rgba(255, 255, 255, 0.12);
  --accent: #dbe8ff;
  --accent-soft: rgba(219, 232, 255, 0.08);
  --max-width: 1200px;
  --content-width: 760px;
  --radius-sm: 18px;
  --radius-md: 24px;
  --radius-lg: 30px;
  --shadow-soft: 0 18px 50px rgba(0, 0, 0, 0.22);
  --shadow-deep: 0 28px 90px rgba(0, 0, 0, 0.34);
}

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

html,
body {
  background:
    radial-gradient(circle at top left, rgba(255, 255, 255, 0.03), transparent 22%),
    linear-gradient(180deg, #06101a 0%, #05070b 28%, #05070b 100%);
  color: var(--text);
  font-family: "Inter", Arial, Helvetica, sans-serif;
  min-height: 100%;
}

body {
  line-height: 1.7;
  letter-spacing: -0.01em;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

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

p {
  max-width: 72ch;
}

.container {
  width: min(100% - 40px, var(--max-width));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  background: rgba(5, 7, 11, 0.70);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.header-inner {
  min-height: 80px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.logo {
  font-size: 0.92rem;
  font-weight: 800;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: #ffffff;
}

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

.site-nav a {
  color: var(--muted);
  font-size: 0.95rem;
  font-weight: 500;
  transition: color 0.25s ease, opacity 0.25s ease;
}

.site-nav a:hover,
.site-nav a:focus-visible {
  color: #fff;
}

.nav-toggle {
  display: none;
  background: transparent;
  border: none;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: #fff;
  margin: 5px 0;
}

.hero {
  position: relative;
  min-height: 84vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  background:
    linear-gradient(180deg, rgba(5, 8, 12, 0.18), rgba(5, 8, 12, 0.88)),
    url("../images/hero-tech.jpg") center center / cover no-repeat;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 15% 18%, rgba(220, 231, 255, 0.10), transparent 24%),
    radial-gradient(circle at 80% 30%, rgba(220, 231, 255, 0.05), transparent 18%);
  pointer-events: none;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(
      to right,
      rgba(7, 12, 20, 0.88),
      rgba(7, 12, 20, 0.58) 42%,
      rgba(7, 12, 20, 0.32) 72%,
      rgba(7, 12, 20, 0.50)
    ),
    linear-gradient(to top, rgba(5, 7, 11, 0.88), rgba(5, 7, 11, 0.18));
}

.hero-inner {
  position: relative;
  z-index: 2;
  padding: 92px 0 80px;
  max-width: 820px;
}

.eyebrow,
.section-label,
.tag {
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-size: 0.74rem;
  font-weight: 700;
}

.eyebrow,
.section-label {
  color: var(--muted-2);
}

.tag {
  color: #d9e4fb;
}

.hero h1 {
  margin-top: 18px;
  font-size: clamp(2.8rem, 6vw, 5.6rem);
  line-height: 0.92;
  letter-spacing: -0.06em;
  max-width: 10.5ch;
  text-wrap: balance;
}

.hero-text {
  margin-top: 24px;
  font-size: 1.10rem;
  line-height: 1.85;
  color: var(--text-soft);
  max-width: 58ch;
}

.hero-actions {
  margin-top: 32px;
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 50px;
  padding: 0 20px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 0.95rem;
  transition: transform 0.25s ease, background 0.25s ease, border-color 0.25s ease, opacity 0.25s ease;
}

.btn:hover,
.btn:focus-visible {
  transform: translateY(-2px);
}

.btn-primary {
  background: #eef4ff;
  color: #0a0f17;
  box-shadow: 0 10px 30px rgba(238, 244, 255, 0.10);
}

.btn-secondary {
  border: 1px solid var(--line-strong);
  background: rgba(255, 255, 255, 0.035);
  color: #fff;
}

.section {
  position: relative;
  padding: 104px 0;
}

.section-heading {
  margin-bottom: 34px;
}

.section-heading h2 {
  margin-top: 10px;
  font-size: clamp(1.9rem, 3vw, 2.8rem);
  line-height: 1.04;
  letter-spacing: -0.045em;
  max-width: 16ch;
}

.featured-card,
.article-card,
.focus-item,
.about-preview,
.content-panel,
.focus-detail,
.sidebar-card,
.listing-card {
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.045), rgba(255, 255, 255, 0.020));
  box-shadow: var(--shadow-soft);
}

.featured-card {
  border-radius: var(--radius-lg);
  overflow: hidden;
  min-height: 420px;
  display: grid;
  align-items: end;
  background:
    linear-gradient(180deg, rgba(8, 12, 20, 0.10), rgba(8, 12, 20, 0.92)),
    url("../images/article-1.jpg") center/cover no-repeat;
}

.featured-content {
  padding: 40px;
  max-width: 760px;
}

.featured-content h3 {
  margin-top: 14px;
  font-size: clamp(1.9rem, 3vw, 2.6rem);
  line-height: 1.02;
  letter-spacing: -0.045em;
  max-width: 18ch;
}

.featured-content p {
  margin-top: 16px;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--text-soft);
  max-width: 60ch;
}

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 18px;
  font-weight: 700;
}

.text-link::after {
  content: "→";
  transition: transform 0.25s ease;
}

.text-link:hover::after,
.text-link:focus-visible::after {
  transform: translateX(4px);
}

.card-grid,
.focus-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.article-card,
.focus-item {
  padding: 30px;
  border-radius: var(--radius-md);
}

.article-card h3,
.focus-item h3 {
  margin-top: 14px;
  font-size: 1.45rem;
  line-height: 1.10;
  letter-spacing: -0.03em;
}

.article-card p,
.focus-item p,
.about-preview p {
  margin-top: 14px;
  color: var(--muted);
  line-height: 1.8;
}

.about-preview {
  border-radius: var(--radius-lg);
  padding: 34px;
  display: grid;
  grid-template-columns: 1.15fr 1fr auto;
  gap: 28px;
  align-items: center;
}

.about-preview h2 {
  max-width: 12ch;
}

.about-preview p {
  max-width: 48ch;
}

.site-footer {
  border-top: 1px solid var(--line);
  padding: 26px 0;
  background: rgba(4, 6, 10, 0.85);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.footer-inner p,
.footer-links a {
  color: var(--muted);
  font-size: 0.94rem;
}

.footer-links {
  display: flex;
  gap: 18px;
}

.article-card,
.focus-item,
.sidebar-card,
.content-panel,
.focus-detail,
.listing-card {
  transition: transform 0.28s ease, border-color 0.28s ease, background 0.28s ease;
}

.article-card:hover,
.focus-item:hover,
.sidebar-card:hover,
.content-panel:hover,
.focus-detail:hover,
.listing-card:hover {
  transform: translateY(-4px);
  border-color: rgba(255, 255, 255, 0.13);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.055), rgba(255, 255, 255, 0.024));
}

/* ARTICLE PAGE */

.article-hero {
  padding: 96px 0 40px;
  background:
    radial-gradient(circle at top left, rgba(255, 255, 255, 0.05), transparent 22%),
    linear-gradient(180deg, #07101a 0%, #05070b 100%);
  border-bottom: 1px solid var(--line);
}

.article-hero-inner {
  max-width: 920px;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  font-weight: 600;
  margin-bottom: 18px;
}

.back-link::before {
  content: "←";
}

.article-hero h1 {
  margin-top: 16px;
  font-size: clamp(2.4rem, 5vw, 4.8rem);
  line-height: 0.95;
  letter-spacing: -0.055em;
  max-width: 13ch;
}

.article-lead {
  margin-top: 24px;
  max-width: 64ch;
  font-size: 1.12rem;
  line-height: 1.85;
  color: var(--text-soft);
}

.article-meta {
  margin-top: 24px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.meta-pill {
  display: inline-flex;
  align-items: center;
  min-height: 38px;
  padding: 0 14px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.03);
  color: #d7deea;
  font-size: 0.88rem;
}

.article-cover-section {
  padding: 26px 0 0;
}

.article-cover {
  overflow: hidden;
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-deep);
}

.article-cover img {
  width: 100%;
  height: auto;
  object-fit: cover;
}

.article-section {
  padding: 56px 0 110px;
}

.article-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 44px;
  align-items: start;
}

.article-content {
  min-width: 0;
  max-width: var(--content-width);
}

.article-content h2 {
  margin-top: 56px;
  margin-bottom: 0;
  font-size: 2rem;
  line-height: 1.08;
  letter-spacing: -0.04em;
  color: #ffffff;
}

.article-content p {
  margin-top: 22px;
  color: #d7dfeb;
  font-size: 1.08rem;
  line-height: 1.95;
  max-width: 68ch;
}

.article-content h2 + p {
  margin-top: 18px;
}

.article-sidebar {
  position: sticky;
  top: 104px;
  display: grid;
  gap: 20px;
}

.sidebar-card {
  padding: 24px;
  border-radius: var(--radius-md);
}

.sidebar-card h3 {
  margin-top: 10px;
  font-size: 1.2rem;
  line-height: 1.16;
}

.sidebar-card p {
  margin-top: 12px;
  color: var(--muted);
  line-height: 1.75;
}

.sidebar-tags {
  margin-top: 14px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.chip {
  padding: 7px 11px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 999px;
  font-size: 0.78rem;
  color: rgba(255, 255, 255, 0.88);
  background: rgba(255, 255, 255, 0.04);
}

/* ARTICLES LISTING */

.listing-hero {
  padding: 96px 0 40px;
  background:
    radial-gradient(circle at top left, rgba(255, 255, 255, 0.04), transparent 22%),
    linear-gradient(180deg, #07101a 0%, #05070b 100%);
  border-bottom: 1px solid var(--line);
}

.listing-hero-inner {
  max-width: 820px;
}

.listing-hero h1 {
  margin-top: 14px;
  font-size: clamp(2.2rem, 5vw, 4.6rem);
  line-height: 0.95;
  letter-spacing: -0.05em;
}

.listing-lead {
  margin-top: 18px;
  max-width: 64ch;
  color: var(--text-soft);
  font-size: 1.06rem;
  line-height: 1.85;
}

.filter-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 28px;
}

.filter-chip {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 0 14px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.03);
  color: var(--muted);
  font-size: 0.9rem;
}

.filter-chip.active {
  color: #0a0f17;
  background: #eef4ff;
  border-color: #eef4ff;
}

.articles-list {
  display: grid;
  gap: 22px;
}

.listing-card {
  display: grid;
  grid-template-columns: 320px minmax(0, 1fr);
  gap: 22px;
  align-items: stretch;
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.listing-card-image {
  min-height: 100%;
}

.listing-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.listing-card-content {
  padding: 28px;
}

.listing-card-content h2 {
  margin-top: 12px;
  font-size: 1.8rem;
  line-height: 1.08;
  letter-spacing: -0.03em;
  max-width: 20ch;
}

.listing-card-content p {
  margin-top: 14px;
  color: var(--muted);
  line-height: 1.8;
}

.listing-meta {
  margin-top: 18px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.listing-meta span {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  padding: 0 12px;
  border-radius: 999px;
  border: 1px solid var(--line);
  color: #d7deea;
  font-size: 0.84rem;
  background: rgba(255, 255, 255, 0.03);
}

.placeholder-listing {
  grid-template-columns: 1fr;
}

/* PAGE HERO + STATIC PAGES */

.page-hero {
  padding: 96px 0 40px;
  background:
    radial-gradient(circle at top left, rgba(255, 255, 255, 0.04), transparent 22%),
    linear-gradient(180deg, #07101a 0%, #05070b 100%);
  border-bottom: 1px solid var(--line);
}

.page-hero-inner {
  max-width: 860px;
}

.page-hero h1 {
  margin-top: 14px;
  font-size: clamp(2.2rem, 5vw, 4.6rem);
  line-height: 0.95;
  letter-spacing: -0.05em;
}

.page-lead {
  margin-top: 18px;
  max-width: 66ch;
  color: var(--text-soft);
  font-size: 1.06rem;
  line-height: 1.85;
}

.page-grid,
.contact-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.7fr) minmax(280px, 360px);
  gap: 32px;
  align-items: start;
}

.content-panel {
  padding: 30px;
  border-radius: var(--radius-lg);
}

.content-panel h2 {
  margin-top: 34px;
  font-size: 1.6rem;
  line-height: 1.12;
  letter-spacing: -0.03em;
}

.content-panel h2:first-child {
  margin-top: 0;
}

.content-panel p {
  margin-top: 16px;
  color: #d5dcea;
  font-size: 1.04rem;
  line-height: 1.9;
}

.page-sidebar {
  display: grid;
  gap: 18px;
}

.focus-stack {
  display: grid;
  gap: 22px;
}

.focus-detail {
  padding: 28px;
  border-radius: var(--radius-lg);
}

.focus-detail h2 {
  margin-top: 12px;
  font-size: 1.7rem;
  line-height: 1.08;
  letter-spacing: -0.03em;
}

.focus-detail p {
  margin-top: 14px;
  color: var(--muted);
  line-height: 1.8;
}

/* ACCESSIBILITY */

.panel:focus-visible,
.site-nav a:focus-visible,
.btn:focus-visible,
.text-link:focus-visible,
.back-link:focus-visible {
  outline: 2px solid rgba(255, 255, 255, 0.9);
  outline-offset: 4px;
}

/* REDUCED MOTION */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
    scroll-behavior: auto !important;
  }
}

/* RESPONSIVE */

@media (max-width: 980px) {
  .site-nav {
    position: absolute;
    top: 80px;
    left: 0;
    right: 0;
    display: none;
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
    padding: 20px;
    background: rgba(5, 7, 11, 0.96);
    border-bottom: 1px solid var(--line);
  }

  .site-nav.is-open {
    display: flex;
  }

  .nav-toggle {
    display: block;
  }

  .card-grid,
  .focus-grid,
  .about-preview,
  .article-layout,
  .page-grid,
  .contact-grid {
    grid-template-columns: 1fr;
  }

  .listing-card {
    grid-template-columns: 1fr;
  }

  .article-sidebar {
    position: static;
  }

  .hero {
    min-height: 74vh;
  }

  .hero h1,
  .article-hero h1 {
    max-width: 12ch;
  }

  .featured-card {
    min-height: 340px;
  }

  .listing-card-image {
    max-height: 280px;
  }

  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 640px) {
  .container {
    width: min(100% - 28px, var(--max-width));
  }

  .section {
    padding: 76px 0;
  }

  .hero-inner {
    padding: 72px 0 64px;
  }

  .article-hero,
  .listing-hero,
  .page-hero {
    padding: 72px 0 28px;
  }

  .featured-content,
  .article-card,
  .focus-item,
  .about-preview,
  .content-panel,
  .focus-detail,
  .sidebar-card,
  .listing-card-content {
    padding: 22px;
  }

  .article-content p {
    font-size: 1rem;
    line-height: 1.88;
  }

  .hero-text,
  .article-lead,
  .listing-lead,
  .page-lead {
    font-size: 1rem;
  }

  .listing-card-content h2 {
    font-size: 1.5rem;
  }
  .article-list {
  margin-top: 22px;
  padding-left: 22px;
  color: #d7dfeb;
}

.article-list li {
  margin-top: 10px;
  line-height: 1.85;
}
.article-share {
  margin-top: 42px;
  padding-top: 26px;
  border-top: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 14px;
}

.article-author {
  margin-top: 18px;
  padding: 18px 22px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: linear-gradient(180deg, rgba(255,255,255,0.04), rgba(255,255,255,0.02));
  box-shadow: var(--shadow-soft);
  max-width: 420px;
}

.article-author-label {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted-2);
  margin-bottom: 10px;
}

.article-author-name {
  margin: 0;
  font-size: 1.08rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text);
  line-height: 1.4;
}
.diagram-wrap {
  margin-top: 30px;
  margin-bottom: 30px;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: 24px;
  background: linear-gradient(180deg, rgba(255,255,255,0.04), rgba(255,255,255,0.02));
  box-shadow: var(--shadow-soft);
  overflow-x: auto;
}

.diagram-wrap .mermaid {
  display: flex;
  justify-content: center;
  align-items: center;
  min-width: 900px;
  padding: 10px;
}

@media (max-width: 980px) {
  .diagram-wrap .mermaid {
    min-width: 760px;
  }
}

@media (max-width: 640px) {
  .diagram-wrap {
    padding: 14px;
    border-radius: 18px;
  }

  .diagram-wrap .mermaid {
    min-width: 680px;
  }
}
}