:root {
  --color-bg: #f7f9fc;
  --color-surface: #ffffff;
  --color-text: #1f2933;
  --color-muted: #4b5563;
  --color-accent: #147b80;
  --color-accent-soft: rgba(20, 123, 128, 0.12);
  --color-border: rgba(15, 23, 42, 0.08);
  --shadow-soft: 0 16px 45px -24px rgba(15, 23, 42, 0.45);
  --shadow-card: 0 18px 30px -20px rgba(15, 23, 42, 0.35);

  --font-family-base: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --header-height: 4.5rem;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family-base);
  font-weight: 400;
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
}

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

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

ul {
  list-style: none;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 1rem;
  background: var(--color-accent);
  color: #fff;
  padding: 0.75rem 1.25rem;
  border-radius: 999px;
  transition: transform 0.3s ease;
}

.skip-link:focus {
  left: 1rem;
  transform: translateY(0);
}

.container {
  width: min(1100px, 92vw);
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(16px);
  background: rgba(247, 249, 252, 0.9);
  border-bottom: 1px solid var(--color-border);
}

.header-container {
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 600;
  font-size: 1.1rem;
}

.brand__dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--color-accent);
  box-shadow: 0 0 0 6px var(--color-accent-soft);
}

.brand__name {
  color: var(--color-text);
  letter-spacing: 0.02em;
}

.primary-navigation ul {
  display: flex;
  align-items: center;
  gap: 1.75rem;
  font-size: 0.95rem;
}

.primary-navigation a {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.35rem 0;
  position: relative;
}

.primary-navigation a::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -6px;
  width: 100%;
  height: 2px;
  background: var(--color-accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.25s ease;
}

.primary-navigation a:hover::after,
.primary-navigation a:focus-visible::after {
  transform: scaleX(1);
}

.nav-toggle {
  display: none;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  padding: 0.35rem 0.85rem;
  background: var(--color-surface);
  color: var(--color-text);
  font-weight: 500;
  cursor: pointer;
  align-items: center;
  gap: 0.65rem;
  transition: border-color 0.2s ease, background 0.2s ease;
}

.nav-toggle:hover,
.nav-toggle:focus-visible {
  border-color: var(--color-accent);
}

.nav-toggle__icon {
  width: 18px;
  height: 2px;
  background: currentColor;
  position: relative;
  display: inline-block;
}

.nav-toggle__icon::before,
.nav-toggle__icon::after {
  content: '';
  position: absolute;
  width: 18px;
  height: 2px;
  background: currentColor;
  left: 0;
  transition: transform 0.3s ease;
}

.nav-toggle__icon::before {
  top: -6px;
}

.nav-toggle__icon::after {
  top: 6px;
}

body.nav-open .nav-toggle[aria-expanded='true'] .nav-toggle__icon {
  background: transparent;
}

body.nav-open .nav-toggle[aria-expanded='true'] .nav-toggle__icon::before {
  transform: translateY(6px) rotate(45deg);
}

body.nav-open .nav-toggle[aria-expanded='true'] .nav-toggle__icon::after {
  transform: translateY(-6px) rotate(-45deg);
}

.hero {
  padding: clamp(5rem, 8vw, 7rem) 0;
}

.hero__content {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(2.5rem, 6vw, 4.5rem);
  align-items: center;
}

.hero__copy h1 {
  font-size: clamp(2.4rem, 4vw, 3.5rem);
  font-weight: 600;
  line-height: 1.1;
  color: var(--color-text);
  letter-spacing: -0.01em;
}

.hero__copy .lead {
  margin-top: 1.5rem;
  font-size: 1.05rem;
  color: var(--color-muted);
  max-width: 540px;
}

.hero__actions {
  margin-top: 2rem;
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.eyebrow {
  font-size: 0.95rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-accent);
  font-weight: 500;
}

.hero__visual {
  position: relative;
  min-height: clamp(240px, 30vw, 360px);
}

.orb {
  position: absolute;
  inset: 0;
  margin: auto;
  width: clamp(220px, 24vw, 320px);
  height: clamp(220px, 24vw, 320px);
  border-radius: 50%;
  background: radial-gradient(circle at 30% 30%, rgba(20, 123, 128, 0.6), rgba(20, 123, 128, 0.15));
  filter: blur(0px);
  box-shadow: 0 30px 60px -40px rgba(20, 123, 128, 0.8);
  animation: float 12s ease-in-out infinite;
}

.net-canvas {
  position: absolute;
  inset: 0;
  margin: auto;
  width: clamp(280px, 34vw, 480px);
  height: clamp(280px, 34vw, 480px);
  border-radius: 28px;
}

@keyframes float {
  0%,
  100% {
    transform: translate3d(0, 0, 0);
  }
  50% {
    transform: translate3d(0, -14px, 0);
  }
}

.section {
  padding: clamp(4rem, 8vw, 6rem) 0;
}

.section__heading {
  max-width: 620px;
  margin-bottom: 2.5rem;
}

.section__heading h2 {
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  font-weight: 600;
  margin-bottom: 1rem;
}

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

.about__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(2rem, 5vw, 4.5rem);
  align-items: center;
}

.about__image {
  border-radius: 28px;
  overflow: hidden;
  position: relative;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-card);
}

.about__image::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(160deg, rgba(20, 123, 128, 0.1), transparent 55%);
}

.about__copy p + p {
  margin-top: 1.25rem;
}

.projects {
  background: var(--color-surface);
}

.projects__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.75rem;
}

.project-card {
  background: linear-gradient(160deg, rgba(20, 123, 128, 0.08), rgba(255, 255, 255, 0.9));
  border: 1px solid rgba(20, 123, 128, 0.14);
  border-radius: 24px;
  padding: 2rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 2rem;
  min-height: 280px;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.project-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-card);
}

.project-card__tag {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--color-accent);
}

.project-card h3 {
  font-size: 1.35rem;
  margin-top: 0.75rem;
  margin-bottom: 1rem;
}

.project-card p {
  color: var(--color-muted);
}

.project-card__link {
  font-weight: 600;
  color: var(--color-accent);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.project-card__link::after {
  content: '↗';
  transition: transform 0.25s ease;
}

.project-card__link:hover::after {
  transform: translate(3px, -2px);
}

.contact__inner {
  display: flex;
  flex-wrap: wrap;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: center;
  justify-content: space-between;
}

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

.socials__link {
  width: 52px;
  height: 52px;
  border-radius: 16px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  color: var(--color-accent);
  box-shadow: 0 8px 18px -14px rgba(15, 23, 42, 0.6);
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
}

.socials__link:hover,
.socials__link:focus-visible {
  transform: translateY(-4px);
  box-shadow: 0 18px 30px -16px rgba(20, 123, 128, 0.45);
  border-color: rgba(20, 123, 128, 0.4);
}

.socials__link svg {
  width: 22px;
  height: 22px;
  fill: currentColor;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  padding: 0.75rem 1.6rem;
  font-weight: 600;
  font-size: 0.95rem;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
  border: 1px solid transparent;
}

.btn--primary {
  background: var(--color-accent);
  color: #fff;
  box-shadow: 0 14px 40px -20px rgba(20, 123, 128, 0.9);
}

.btn--primary:hover,
.btn--primary:focus-visible {
  transform: translateY(-2px);
  box-shadow: 0 18px 30px -16px rgba(20, 123, 128, 0.6);
}

.btn--ghost {
  background: transparent;
  border-color: rgba(20, 123, 128, 0.4);
  color: var(--color-accent);
}

.btn--ghost:hover,
.btn--ghost:focus-visible {
  border-color: var(--color-accent);
  transform: translateY(-2px);
}

.site-footer {
  padding: 2rem 0 3rem;
  background: rgba(20, 123, 128, 0.05);
  border-top: 1px solid var(--color-border);
}

.footer__layout {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  font-size: 0.9rem;
  color: var(--color-muted);
}

.footer__link {
  color: var(--color-accent);
  font-weight: 600;
}

@media (max-width: 900px) {
  .hero__content,
  .about__grid {
    grid-template-columns: 1fr;
  }

  .hero__visual {
    order: -1;
    margin-bottom: 2rem;
  }
}

@media (max-width: 780px) {
  .nav-toggle {
    display: inline-flex;
  }

  .primary-navigation {
    position: absolute;
    inset: calc(var(--header-height)) 0 auto;
    padding: 1.5rem 1.75rem 2rem;
    background: rgba(247, 249, 252, 0.96);
    border-bottom: 1px solid var(--color-border);
    box-shadow: 0 24px 50px -30px rgba(15, 23, 42, 0.3);
    transform: translateY(-20px);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity 0.25s ease, transform 0.25s ease;
  }

  body.nav-open .primary-navigation {
    opacity: 1;
    transform: translateY(0);
    visibility: visible;
    pointer-events: auto;
  }

  .primary-navigation ul {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
  }

  .hero__copy .lead {
    font-size: 1rem;
  }
}

@media (max-width: 520px) {
  .hero {
    padding-top: 4rem;
  }

  .hero__copy h1 {
    font-size: 2.1rem;
  }

  .hero__actions {
    gap: 0.75rem;
  }

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

  .socials__link {
    width: 48px;
    height: 48px;
  }
}