/* ===== Design tokens ===== */
:root {
  --color-black: #0d0f0d;
  --color-black-soft: #16181a;
  --color-white: #ffffff;
  --color-green: #39ff14;
  --color-green-dim: #22c40f;

  --font-base: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;

  --container-width: 1140px;
  --section-padding: 6rem 0;

  --radius: 10px;
  --transition: 0.2s ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-base);
  background: var(--color-black);
  color: var(--color-white);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 {
  line-height: 1.2;
  margin: 0 0 1rem;
}

p {
  margin: 0 0 1rem;
}

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

a:hover,
a:focus-visible {
  color: var(--color-white);
}

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

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

.container {
  width: 100%;
  max-width: var(--container-width);
  margin-inline: auto;
  padding-inline: 1.5rem;
}

/* ===== Header / Nav ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(13, 15, 13, 0.9);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid rgba(57, 255, 20, 0.15);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.logo {
  display: inline-flex;
  align-items: center;
}

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

.primary-nav ul {
  display: flex;
  gap: 2rem;
}

.nav-link {
  color: var(--color-white);
  font-weight: 500;
  position: relative;
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -6px;
  width: 0;
  height: 2px;
  background: var(--color-green);
  transition: width var(--transition);
}

.nav-link:hover::after,
.nav-link:focus-visible::after {
  width: 100%;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  background: none;
  border: none;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--color-white);
  transition: transform var(--transition), opacity var(--transition);
}

/* ===== Buttons ===== */
.btn {
  display: inline-block;
  padding: 0.85rem 1.75rem;
  border-radius: var(--radius);
  font-weight: 600;
  border: 2px solid transparent;
  transition: background var(--transition), color var(--transition), border-color var(--transition);
}

.btn-primary {
  background: var(--color-green);
  color: var(--color-black);
}

.btn-primary:hover,
.btn-primary:focus-visible {
  background: var(--color-green-dim);
  color: var(--color-black);
}

.btn-outline {
  border-color: var(--color-green);
  color: var(--color-green);
}

.btn-outline:hover,
.btn-outline:focus-visible {
  background: var(--color-green);
  color: var(--color-black);
}

/* ===== Sections ===== */
.section {
  padding: var(--section-padding);
}

.section-alt {
  background: var(--color-black-soft);
}

.section-title {
  font-size: clamp(1.75rem, 3vw, 2.5rem);
}

.section-subtitle {
  max-width: 640px;
  color: rgba(255, 255, 255, 0.75);
  margin-bottom: 3rem;
}

/* ===== Hero ===== */
.hero {
  min-height: 90vh;
  display: flex;
  align-items: center;
  background:
    radial-gradient(circle at 20% 20%, rgba(57, 255, 20, 0.12), transparent 40%),
    radial-gradient(circle at 80% 80%, rgba(57, 255, 20, 0.08), transparent 40%);
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--color-green);
  font-weight: 700;
  font-size: 0.85rem;
}

.lead {
  max-width: 60ch;
  color: rgba(255, 255, 255, 0.8);
  font-size: 1.15rem;
}

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

.hero-inner {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 2rem;
}

.hero-image {
  width: 100%;
  height: auto;
  border-radius: var(--radius);
  border: 1px solid rgba(57, 255, 20, 0.15);
}

/* ===== Cards ===== */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
}

.card {
  background: var(--color-black-soft);
  border: 1px solid rgba(57, 255, 20, 0.15);
  border-radius: var(--radius);
  padding: 2rem;
  transition: border-color var(--transition), transform var(--transition);
}

.card:hover {
  border-color: var(--color-green);
  transform: translateY(-4px);
}

.card-icon {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: rgba(57, 255, 20, 0.12);
  border: 1px solid var(--color-green);
  margin-bottom: 1.25rem;
}

.card-image {
  width: calc(100% + 4rem);
  height: 170px;
  object-fit: cover;
  margin: -2rem -2rem 1.25rem;
  border-radius: var(--radius) var(--radius) 0 0;
}

.card p:last-child {
  margin-bottom: 0;
}

/* ===== Tech tags ===== */
.tech-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 3rem;
}

.tag {
  border: 1px solid var(--color-green);
  color: var(--color-green);
  border-radius: 999px;
  padding: 0.4rem 1rem;
  font-size: 0.9rem;
  font-weight: 600;
}

/* ===== About ===== */
.about-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 3rem;
  align-items: start;
}

.doc-list li {
  margin-bottom: 0.5rem;
}

.doc-list a::before {
  content: "↓ ";
}

.contact-card {
  background: var(--color-black-soft);
  border: 1px solid rgba(57, 255, 20, 0.15);
  border-radius: var(--radius);
  padding: 2rem;
}

.contact-list li {
  margin-bottom: 0.75rem;
}

.contact-list strong {
  color: var(--color-white);
  display: block;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: rgba(255, 255, 255, 0.55);
}

/* ===== Footer ===== */
.site-footer {
  border-top: 1px solid rgba(57, 255, 20, 0.15);
  padding: 2rem 0;
}

.footer-inner {
  text-align: center;
  color: rgba(255, 255, 255, 0.6);
  font-size: 0.9rem;
}

/* ===== Responsive ===== */
@media (max-width: 860px) {
  .about-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 720px) {
  .nav-toggle {
    display: flex;
  }

  .primary-nav {
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    background: var(--color-black);
    border-bottom: 1px solid rgba(57, 255, 20, 0.15);
    transform: translateY(-150%);
    opacity: 0;
    transition: transform var(--transition), opacity var(--transition);
  }

  .primary-nav.is-open {
    transform: translateY(0);
    opacity: 1;
  }

  .primary-nav ul {
    flex-direction: column;
    gap: 0;
    padding: 1rem 1.5rem 1.5rem;
  }

  .primary-nav li {
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  }

  .primary-nav a {
    display: block;
    padding: 1rem 0;
  }

  .nav-toggle.is-open span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }

  .nav-toggle.is-open span:nth-child(2) {
    opacity: 0;
  }

  .nav-toggle.is-open span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }
}

@media (max-width: 480px) {
  :root {
    --section-padding: 4rem 0;
  }

  .hero-actions {
    flex-direction: column;
  }

  .btn {
    text-align: center;
  }
}