/* ==========================================================================
   SystemFromScratch® — site styles
   ========================================================================== */

:root {
  --bg: #050b16;
  --bg-alt: #071122;
  --surface: #0a1628;
  --surface-2: #0d1c33;
  --border: #15294a;
  --border-strong: #1e3a66;
  --text: #e6edf7;
  --text-muted: #9aabc4;
  --text-dim: #6b7d99;
  --accent: #2f8cff;
  --accent-strong: #1a6fe0;
  --accent-soft: rgba(47, 140, 255, 0.12);
  --success: #3fcf8e;
  --radius: 10px;
  --radius-sm: 6px;
  --container: 1180px;
  --header-h: 72px;
  --font: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, "Cascadia Code", Consolas, monospace;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 16px);
}

body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  color: #5ea6ff;
}

h1,
h2,
h3,
h4 {
  margin: 0;
  line-height: 1.2;
  font-weight: 600;
}

p {
  margin: 0;
}

ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

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

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

/* ---------- Header ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-h);
  background: rgba(5, 11, 22, 0.82);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  gap: 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--text);
  flex-shrink: 0;
}

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

.brand-mark {
  width: 38px;
  height: 38px;
  color: var(--accent);
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.05;
  letter-spacing: 0.04em;
}

.brand-text strong {
  font-size: 15px;
  font-weight: 700;
}

.brand-text span {
  font-size: 11px;
  font-weight: 500;
  color: var(--text-muted);
}

.nav {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav a {
  position: relative;
  padding: 8px 14px;
  font-size: 14.5px;
  font-weight: 500;
  color: var(--text-muted);
  transition: color 0.15s;
}

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

.nav a.active {
  color: var(--accent);
}

.nav a.active::after {
  content: "";
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: -2px;
  height: 2px;
  background: var(--accent);
  border-radius: 2px;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.icon-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  color: var(--text);
  transition: background 0.15s;
}

.icon-link:hover {
  color: var(--text);
  background: var(--surface-2);
}

.icon-link svg {
  width: 24px;
  height: 24px;
}

.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text);
  cursor: pointer;
}

.nav-toggle svg {
  width: 22px;
  height: 22px;
  margin: auto;
}

/* ---------- Buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 22px;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  transition: background 0.15s, border-color 0.15s, transform 0.15s;
  cursor: pointer;
}

.btn svg {
  width: 16px;
  height: 16px;
  transition: transform 0.15s;
}

.btn:hover svg {
  transform: translateX(3px);
}

.btn-primary {
  color: #fff;
  background: var(--accent-strong);
  box-shadow: 0 8px 24px -10px rgba(47, 140, 255, 0.7);
}

.btn-primary:hover {
  color: #fff;
  background: var(--accent);
}

.btn-outline {
  color: var(--text);
  border-color: var(--border-strong);
  background: rgba(10, 22, 40, 0.6);
}

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

/* ---------- Hero ---------- */

.hero {
  position: relative;
  overflow: hidden;
  padding: 88px 0 72px;
  background:
    radial-gradient(ellipse 60% 70% at 78% 40%, rgba(26, 111, 224, 0.22), transparent 70%),
    linear-gradient(180deg, #050b16 0%, #061020 100%);
  border-bottom: 1px solid var(--border);
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(47, 140, 255, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(47, 140, 255, 0.05) 1px, transparent 1px);
  background-size: 40px 40px;
  mask-image: radial-gradient(ellipse 70% 80% at 70% 40%, #000 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 70% 80% at 70% 40%, #000 30%, transparent 75%);
  pointer-events: none;
}

.hero .container {
  position: relative;
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  align-items: center;
  gap: 32px;
}

.hero h1 {
  font-size: clamp(32px, 4.2vw, 48px);
  font-weight: 700;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  line-height: 1.08;
}

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

.hero-rule {
  position: relative;
  width: 120px;
  height: 2px;
  margin: 26px 0;
  background: linear-gradient(90deg, var(--accent), transparent);
}

.hero-rule::after {
  content: "";
  position: absolute;
  left: 62px;
  top: -3px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 12px var(--accent);
}

.hero-lead {
  max-width: 520px;
  font-size: 18px;
  color: var(--text-muted);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 34px;
}

.hero-features {
  display: flex;
  flex-wrap: wrap;
  margin-top: 44px;
}

.hero-feature {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 4px 16px 4px 0;
  margin-right: 16px;
  border-right: 1px solid var(--border);
  font-size: 13px;
  line-height: 1.35;
  color: var(--text-muted);
  white-space: nowrap;
}

.hero-feature:last-child {
  border-right: 0;
  margin-right: 0;
}

.hero-feature svg {
  width: 28px;
  height: 28px;
  flex-shrink: 0;
  color: var(--accent);
}

.hero-visual {
  position: relative;
}

.hero-visual svg {
  width: 112%;
  margin-left: -6%;
  height: auto;
  filter: drop-shadow(0 30px 60px rgba(0, 0, 0, 0.6));
}

.chip-trace {
  stroke-dasharray: 6 10;
  animation: trace 3s linear infinite;
}

@keyframes trace {
  to {
    stroke-dashoffset: -64;
  }
}

.chip-led {
  animation: pulse 2.4s ease-in-out infinite;
}

@keyframes pulse {
  50% {
    opacity: 0.35;
  }
}

/* ---------- Sections ---------- */

.section {
  padding: 88px 0;
}

.section + .section {
  border-top: 1px solid var(--border);
}

.section-alt {
  background: var(--bg-alt);
}

.eyebrow {
  display: inline-block;
  margin-bottom: 10px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
}

.section-title {
  font-size: clamp(26px, 3vw, 34px);
}

.section-intro {
  max-width: 640px;
  margin-top: 14px;
  color: var(--text-muted);
}

.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 36px;
}

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14.5px;
  font-weight: 500;
  white-space: nowrap;
}

.link-arrow svg {
  width: 15px;
  height: 15px;
  transition: transform 0.15s;
}

.link-arrow:hover svg {
  transform: translateX(3px);
}

/* ---------- Cards ---------- */

.card {
  background: linear-gradient(180deg, var(--surface-2), var(--surface));
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: border-color 0.2s, transform 0.2s, box-shadow 0.2s;
}

.card:hover {
  border-color: var(--border-strong);
  transform: translateY(-3px);
  box-shadow: 0 18px 40px -20px rgba(47, 140, 255, 0.35);
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.service-card {
  display: flex;
  flex-direction: column;
  padding: 30px 26px 26px;
}

.service-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  margin-bottom: 22px;
  border-radius: 12px;
  background: var(--accent-soft);
  border: 1px solid rgba(47, 140, 255, 0.25);
  color: var(--accent);
}

.service-icon svg {
  width: 30px;
  height: 30px;
}

.service-card h3 {
  font-size: 18px;
  margin-bottom: 10px;
}

.service-card p {
  font-size: 14.5px;
  color: var(--text-muted);
}

.service-card ul {
  margin-top: 16px;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

/* ---------- Tags ---------- */

.tag {
  display: inline-block;
  padding: 3px 9px;
  font-size: 12px;
  font-weight: 500;
  color: #8fc0ff;
  background: rgba(47, 140, 255, 0.1);
  border: 1px solid rgba(47, 140, 255, 0.22);
  border-radius: 4px;
  white-space: nowrap;
}

/* ---------- Expertise ---------- */

.expertise {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: 56px;
  align-items: center;
}

.checklist {
  margin-top: 28px;
  display: grid;
  gap: 14px;
}

.checklist li {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  color: var(--text);
}

.checklist svg {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  margin-top: 2px;
  color: var(--accent);
}

.checklist small {
  display: block;
  color: var(--text-muted);
  font-size: 14px;
}

.tech-panel {
  padding: 22px 24px 24px;
}

.tech-panel:hover {
  transform: none;
}

.tech-group + .tech-group {
  margin-top: 20px;
}

.tech-group h4 {
  margin-bottom: 12px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
}

.tech-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.tech-item {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 62px;
  padding: 10px;
  font-size: 15px;
  font-weight: 600;
  text-align: center;
  color: var(--text);
  border-right: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  background: rgba(5, 11, 22, 0.35);
  transition: background 0.15s, color 0.15s;
}

.tech-item:hover {
  background: var(--accent-soft);
  color: #8fc0ff;
}

.tech-item:nth-child(4n) {
  border-right: 0;
}

.tech-grid .tech-item:nth-last-child(-n + 4) {
  border-bottom: 0;
}

/* ---------- Projects ---------- */

.projects-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

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

.project-media {
  position: relative;
  aspect-ratio: 16 / 8;
  overflow: hidden;
  border-bottom: 1px solid var(--border);
  background:
    radial-gradient(circle at 70% 30%, rgba(47, 140, 255, 0.28), transparent 60%),
    linear-gradient(135deg, #0b1a33, #050b16);
}

.project-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.project-media .art {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
}

.project-media .art svg {
  width: 42%;
  height: auto;
  opacity: 0.95;
}

.project-media .code-art {
  position: absolute;
  inset: 0;
  padding: 16px 18px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  line-height: 1.6;
  color: #4f9bff;
  opacity: 0.32;
  white-space: pre;
  overflow: hidden;
  pointer-events: none;
}

.project-status {
  position: absolute;
  top: 12px;
  left: 12px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--text);
  background: rgba(5, 11, 22, 0.8);
  border: 1px solid var(--border-strong);
  border-radius: 999px;
}

.project-status::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #f5b84a;
}

.project-status.is-stable::before {
  background: var(--success);
}

.project-body {
  display: flex;
  flex-direction: column;
  flex: 1;
  padding: 20px 20px 22px;
}

.project-body h3 {
  font-size: 17.5px;
  margin-bottom: 8px;
}

.project-body p {
  font-size: 14.5px;
  color: var(--text-muted);
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 16px;
}

.project-links {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  margin-top: auto;
  padding-top: 18px;
}

.project-links a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  font-weight: 500;
}

.project-links svg {
  width: 16px;
  height: 16px;
}

.project-features {
  margin-top: 14px;
  display: grid;
  gap: 6px;
  font-size: 14px;
  color: var(--text-muted);
}

.project-features li {
  position: relative;
  padding-left: 16px;
}

.project-features li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 6px;
  height: 6px;
  border-radius: 1px;
  background: var(--accent);
}

/* ---------- About ---------- */

.about {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
}

.about-logo {
  padding: 24px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: radial-gradient(circle at 50% 50%, rgba(26, 111, 224, 0.18), transparent 70%), var(--surface);
}

.about-logo img {
  width: 100%;
  height: auto;
}

.about p + p {
  margin-top: 16px;
}

.about-text p {
  color: var(--text-muted);
}

.stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 32px;
}

.stat {
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
}

.stat strong {
  display: block;
  font-size: 15px;
  color: var(--text);
}

.stat span {
  font-size: 13px;
  color: var(--text-dim);
}

/* ---------- CTA ---------- */

.cta {
  position: relative;
  display: flex;
  align-items: center;
  gap: 32px;
  padding: 34px 40px;
  overflow: hidden;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  background:
    radial-gradient(ellipse 50% 120% at 10% 50%, rgba(47, 140, 255, 0.18), transparent 70%),
    linear-gradient(90deg, var(--surface-2), var(--surface));
}

.cta-art {
  width: 120px;
  flex-shrink: 0;
  color: var(--accent);
}

.cta-text {
  flex: 1;
}

.cta-text h2 {
  font-size: 24px;
  margin-bottom: 6px;
}

.cta-text p {
  color: var(--text-muted);
}

.contact-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 24px;
  margin-top: 14px;
  font-size: 14.5px;
}

.contact-list a,
.contact-place {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--text);
}

.contact-list a:hover {
  color: var(--accent);
}

.contact-list svg {
  width: 17px;
  height: 17px;
  color: var(--accent);
}

/* ---------- Page header (sub-pages) ---------- */

.page-hero {
  padding: 72px 0 56px;
  border-bottom: 1px solid var(--border);
  background:
    radial-gradient(ellipse 50% 90% at 85% 20%, rgba(26, 111, 224, 0.2), transparent 70%),
    var(--bg);
}

.page-hero h1 {
  font-size: clamp(32px, 4vw, 44px);
  font-weight: 700;
}

.page-hero p {
  max-width: 680px;
  margin-top: 14px;
  font-size: 17px;
  color: var(--text-muted);
}

.filters {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 28px;
}

.filter {
  padding: 7px 14px;
  font: inherit;
  font-size: 13.5px;
  font-weight: 500;
  color: var(--text-muted);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s, background 0.15s;
}

.filter:hover {
  color: var(--text);
  border-color: var(--border-strong);
}

.filter.is-active {
  color: #fff;
  background: var(--accent-strong);
  border-color: var(--accent-strong);
}

.empty-note {
  padding: 40px;
  text-align: center;
  color: var(--text-muted);
  border: 1px dashed var(--border-strong);
  border-radius: var(--radius);
}

/* ---------- Footer ---------- */

.site-footer {
  padding: 56px 0 32px;
  background: #040912;
  border-top: 1px solid var(--border);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.6fr repeat(4, 1fr);
  gap: 32px;
}

.footer-brand p {
  max-width: 280px;
  margin-top: 16px;
  font-size: 14px;
  color: var(--text-dim);
}

.footer-col h4 {
  margin-bottom: 14px;
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text);
}

.footer-col li + li {
  margin-top: 8px;
}

.footer-col a {
  font-size: 14px;
  color: var(--text-muted);
}

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

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  margin-top: 44px;
  padding-top: 22px;
  border-top: 1px solid var(--border);
  font-size: 13px;
  color: var(--text-dim);
}

/* ---------- Reveal animation ---------- */

.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: none;
}

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

  .reveal {
    opacity: 1;
    transform: none;
  }

  .chip-trace,
  .chip-led {
    animation: none;
  }
}

/* ---------- Responsive ---------- */

@media (max-width: 1080px) {
  .services-grid,
  .projects-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .expertise,
  .about {
    grid-template-columns: 1fr;
    gap: 40px;
  }

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

  .footer-brand {
    grid-column: 1 / -1;
  }
}

@media (max-width: 900px) {
  .nav-toggle {
    display: inline-flex;
  }

  .nav {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 12px 16px 20px;
    background: rgba(5, 11, 22, 0.97);
    border-bottom: 1px solid var(--border);
    transform: translateY(-8px);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.2s, transform 0.2s, visibility 0.2s;
  }

  .nav.is-open {
    transform: none;
    opacity: 1;
    visibility: visible;
  }

  .nav a {
    padding: 12px 8px;
    border-bottom: 1px solid var(--border);
  }

  .nav a.active::after {
    display: none;
  }

  .hero {
    padding: 56px 0;
  }

  .hero .container {
    grid-template-columns: minmax(0, 1fr);
  }

  .hero-feature {
    white-space: normal;
  }

  .hero-visual {
    order: -1;
    max-width: 440px;
    margin: 0 auto;
  }
}

@media (max-width: 640px) {
  .container {
    padding: 0 16px;
  }

  .section {
    padding: 64px 0;
  }

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

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

  .tech-item:nth-child(4n) {
    border-right: 1px solid var(--border);
  }

  .tech-item:nth-child(2n) {
    border-right: 0;
  }

  .tech-grid .tech-item:nth-last-child(-n + 4) {
    border-bottom: 1px solid var(--border);
  }

  .tech-grid .tech-item:nth-last-child(-n + 2) {
    border-bottom: 0;
  }

  .hero-feature {
    width: 50%;
    margin: 0 0 14px;
    padding-right: 10px;
    border-right: 0;
  }

  .section-head {
    flex-direction: column;
    align-items: flex-start;
  }

  .cta {
    flex-direction: column;
    align-items: flex-start;
    padding: 28px 22px;
  }

  .cta-art {
    display: none;
  }

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

  .brand-text span {
    display: none;
  }
}

/* Prevent grid children from forcing horizontal overflow on narrow screens */
.hero .container > *,
.expertise > *,
.about > * {
  min-width: 0;
}