:root {
  --green: #203e25;
  --green-hover: #2a5031;
  --green-deep: #162b1a;
  --black: #000000;
  --white: #ffffff;
  --muted-white: rgba(255, 255, 255, 0.82);
  --border-white: rgba(255, 255, 255, 0.18);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  background: var(--black);
  color: var(--white);
  font-family: Arial, Helvetica, "Segoe UI", sans-serif;
}

body {
  min-height: 100vh;
  display: grid;
  grid-template-rows: auto 1fr auto;
}

a {
  color: inherit;
}

/* Header */
.site-header {
  min-height: 101px;
  padding: 0 3.05vw;
  background: var(--green);
  color: var(--white);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  position: relative;
  z-index: 200;
}

.brand {
  display: inline-flex;
  flex-direction: column;
  flex: 0 0 auto;
  text-decoration: none;
  color: var(--white);
  line-height: 1;
  white-space: nowrap;
}

.brand-name {
  font-size: clamp(1.6rem, 2.2vw, 2.55rem);
  font-weight: 700;
  letter-spacing: 0.055em;
}

.brand-affiliation {
  margin-top: 0.38rem;
  font-size: clamp(0.72rem, 1vw, 1.03rem);
  font-weight: 600;
  letter-spacing: 0.28em;
}

.main-nav {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: clamp(1.15rem, 2.35vw, 2.85rem);
  color: var(--white);
  font-size: clamp(1rem, 1.42vw, 1.46rem);
  font-weight: 500;
  white-space: nowrap;
}

.mobile-menu-toggle {
  display: none;
}

/* Main content */
.page-main {
  display: flex;
  justify-content: center;
  align-items: center;
  min-width: 0;
  padding: 5.7rem 2rem 2.2rem;
  background: var(--black);
}

.hero {
  width: min(100%, 640px);
  margin-top: -0.7rem;
}

.hero h1 {
  margin: 0;
  color: var(--white);
  font-size: clamp(4rem, 7vw, 7.15rem);
  line-height: 0.95;
  font-weight: 700;
  letter-spacing: 0.018em;
  white-space: nowrap;
}

.tagline {
  margin: 1.35rem 0 1.8rem;
  color: var(--white);
  font-size: clamp(1.35rem, 2vw, 2rem);
  line-height: 1.28;
  font-style: normal;
  font-weight: 500;
}

.coming-soon {
  margin: -0.35rem 0 1.45rem;
  color: var(--white);
  font-size: clamp(1rem, 1.36vw, 1.39rem);
  line-height: 1.52;
}

.body-copy {
  max-width: 640px;
  color: var(--white);
  font-size: clamp(1rem, 1.36vw, 1.39rem);
  line-height: 1.52;
  text-align: justify;
  text-justify: inter-word;
}

.body-copy p {
  margin: 0 0 1.45rem;
}

.contact-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 178px;
  min-height: 62px;
  margin-top: 0.35rem;
  padding: 0.85rem 1.8rem;
  border: 1.5px solid var(--green);
  border-radius: 4px;
  color: var(--white);
  background: var(--green);
  font-size: 1.34rem;
  font-weight: 600;
  letter-spacing: 0.015em;
  text-decoration: none;
  transition: background 150ms ease, border-color 150ms ease;
}

.contact-button:hover,
.contact-button:focus-visible {
  background: var(--green-hover);
  border-color: var(--green-hover);
}

/* Footer */
.site-footer {
  min-height: 46px;
  background: var(--green);
  color: var(--white);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0.65rem 1rem;
}

.site-footer a {
  color: var(--white);
  text-decoration: none;
  font-size: 0.98rem;
  font-weight: 500;
  letter-spacing: 0.34em;
}

/* Scientific notation */
sub {
  font-size: 0.7em;
  line-height: 0;
  vertical-align: sub;
}

/* Desktop dropdown navigation */
.nav-item,
.nav-menu-button {
  font: inherit;
  color: inherit;
  white-space: nowrap;
}

.nav-placeholder {
  display: inline-flex;
  align-items: center;
  min-height: 2.35rem;
}

.nav-menu {
  position: relative;
  display: inline-flex;
  align-items: center;
}

.nav-menu-button {
  appearance: none;
  border: 0;
  background: transparent;
  padding: 0;
  margin: 0;
  display: inline-flex;
  align-items: center;
  gap: 0.38rem;
  cursor: pointer;
}

.dropdown-icon {
  display: inline-block;
  font-size: 0.72em;
  line-height: 1;
  transform: translateY(0.04em);
  transition: transform 140ms ease;
}

.nav-menu.open .dropdown-icon {
  transform: translateY(0.04em) rotate(180deg);
}

.dropdown-menu {
  position: absolute;
  top: calc(100% + 0.78rem);
  left: 50%;
  min-width: 215px;
  padding: 0.5rem 0;
  background: var(--green-deep);
  color: var(--white);
  border: 1px solid var(--border-white);
  border-radius: 4px;
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.5);
  transform: translateX(-50%) translateY(-4px);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  z-index: 220;
  transition: opacity 120ms ease, transform 120ms ease, visibility 120ms ease;
}

.dropdown-menu::before {
  content: "";
  position: absolute;
  left: 50%;
  top: -6px;
  width: 10px;
  height: 10px;
  background: var(--green-deep);
  border-left: 1px solid var(--border-white);
  border-top: 1px solid var(--border-white);
  transform: translateX(-50%) rotate(45deg);
}

.dropdown-menu span {
  display: block;
  padding: 0.68rem 1rem;
  color: var(--white);
  font-size: 0.98rem;
  line-height: 1.25;
  white-space: nowrap;
  cursor: default;
}

.dropdown-menu span + span {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.nav-menu.open .dropdown-menu,
.nav-menu:focus-within .dropdown-menu {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateX(-50%) translateY(0);
}

.nav-menu-button:focus-visible,
.mobile-menu-toggle:focus-visible,
.brand:focus-visible,
.contact-button:focus-visible,
.site-footer a:focus-visible {
  outline: 2px solid var(--white);
  outline-offset: 4px;
}

/* Invisible bridge across the small visual gap below desktop menu labels. */
.nav-menu::after {
  content: "";
  position: absolute;
  top: 100%;
  left: -0.65rem;
  right: -0.65rem;
  height: 0.9rem;
  z-index: 210;
}

@media (hover: hover) and (pointer: fine) {
  .nav-menu:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: translateX(-50%) translateY(0);
  }
}

/* Tablet: keep desktop navigation but give it room to wrap. */
@media (max-width: 1050px) and (min-width: 761px) {
  .site-header {
    padding-top: 0.9rem;
    padding-bottom: 0.9rem;
    align-items: flex-start;
  }

  .main-nav {
    flex-wrap: wrap;
    gap: 0.55rem 1.15rem;
    padding-top: 0.25rem;
  }

  .page-main {
    align-items: flex-start;
    padding-top: 4.2rem;
  }

  .hero h1 {
    white-space: normal;
  }

  .dropdown-menu {
    left: 0;
    transform: translateX(0) translateY(-4px);
  }

  .dropdown-menu::before {
    left: 1.6rem;
  }

  .nav-menu.open .dropdown-menu,
  .nav-menu:focus-within .dropdown-menu,
  .nav-menu:hover .dropdown-menu {
    transform: translateX(0) translateY(0);
  }
}

/* Phone navigation and layout */
@media (max-width: 760px) {
  body {
    display: flex;
    min-height: 100vh;
    flex-direction: column;
  }

  .site-header {
    min-height: 78px;
    padding: 0.8rem 1.1rem;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
  }

  .brand-name {
    font-size: clamp(1.45rem, 7.4vw, 1.95rem);
  }

  .brand-affiliation {
    margin-top: 0.3rem;
    font-size: clamp(0.62rem, 3.1vw, 0.78rem);
    letter-spacing: 0.24em;
  }

  .mobile-menu-toggle {
    appearance: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.65rem;
    margin-left: auto;
    min-height: 44px;
    padding: 0.5rem 0.2rem 0.5rem 0.6rem;
    border: 0;
    color: var(--white);
    background: transparent;
    font: inherit;
    cursor: pointer;
  }

  .mobile-menu-label {
    font-size: 0.88rem;
    font-weight: 600;
    letter-spacing: 0.09em;
  }

  .hamburger {
    width: 24px;
    height: 18px;
    display: inline-flex;
    flex-direction: column;
    justify-content: space-between;
  }

  .hamburger span {
    display: block;
    width: 100%;
    height: 2px;
    background: var(--white);
    transform-origin: center;
    transition: transform 160ms ease, opacity 160ms ease;
  }

  .site-header.mobile-open .hamburger span:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
  }

  .site-header.mobile-open .hamburger span:nth-child(2) {
    opacity: 0;
  }

  .site-header.mobile-open .hamburger span:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
  }

  .main-nav {
    display: none;
    flex: 1 0 100%;
    width: 100%;
    padding: 0.45rem 0 0.55rem;
    border-top: 1px solid rgba(255, 255, 255, 0.16);
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    font-size: 1rem;
    white-space: normal;
  }

  .site-header.mobile-open .main-nav {
    display: flex;
  }

  .nav-placeholder,
  .nav-menu-button {
    width: 100%;
    min-height: 46px;
    padding: 0.68rem 0.25rem;
    justify-content: space-between;
  }

  .nav-placeholder {
    display: flex;
    align-items: center;
  }

  .nav-menu {
    display: block;
    width: 100%;
  }

  .nav-menu::after {
    display: none;
  }

  .nav-menu-button {
    display: flex;
    font-weight: 500;
    text-align: left;
  }

  .dropdown-icon {
    margin-left: auto;
    font-size: 0.85em;
  }

  .dropdown-menu,
  .nav-menu.open .dropdown-menu,
  .nav-menu:focus-within .dropdown-menu {
    position: static;
    display: none;
    min-width: 0;
    width: 100%;
    padding: 0 0 0.45rem;
    background: transparent;
    border: 0;
    border-radius: 0;
    box-shadow: none;
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: none;
  }

  .nav-menu.open .dropdown-menu {
    display: block;
  }

  .dropdown-menu::before {
    display: none;
  }

  .dropdown-menu span {
    padding: 0.55rem 0.25rem 0.55rem 1.15rem;
    color: var(--muted-white);
    font-size: 0.94rem;
    line-height: 1.3;
    white-space: normal;
  }

  .dropdown-menu span + span {
    border-top: 0;
  }

  .page-main {
    flex: 1 0 auto;
    align-items: flex-start;
    padding: clamp(3rem, 11vw, 4.8rem) 1.25rem 3rem;
  }

  .hero {
    width: min(100%, 580px);
    margin: 0 auto;
  }

  .hero h1 {
    white-space: normal;
    font-size: clamp(3.25rem, 16vw, 5.2rem);
    line-height: 0.94;
  }

  .tagline {
    margin: 1.15rem 0 1.65rem;
    font-size: clamp(1.25rem, 5.8vw, 1.65rem);
    line-height: 1.3;
  }

  .tagline br {
    display: none;
  }

  .coming-soon {
    margin: 0 0 1.35rem;
    font-size: 1.05rem;
  }

  .body-copy {
    max-width: none;
    font-size: 1.05rem;
    line-height: 1.58;
    text-align: left;
  }

  .body-copy p {
    margin-bottom: 1.35rem;
  }

  .contact-button {
    min-width: 150px;
    min-height: 54px;
    font-size: 1.05rem;
    padding: 0.72rem 1.4rem;
  }

  .site-footer {
    min-height: 42px;
    padding: 0.55rem 1rem;
  }

  .site-footer a {
    font-size: 0.78rem;
    letter-spacing: 0.28em;
  }
}

@media (max-width: 380px) {
  .site-header {
    padding-left: 0.9rem;
    padding-right: 0.9rem;
  }

  .mobile-menu-label {
    display: none;
  }

  .page-main {
    padding-left: 1rem;
    padding-right: 1rem;
  }

  .hero h1 {
    font-size: clamp(2.95rem, 15.5vw, 4rem);
  }
}