:root {
  --primary: #031e3e;
  --primary-hover: #0a2457;
  --accent: #37b9ff;
  --light-bg: #f8fafc;
  --white: #ffffff;
  --text-dark: #031e3e;
  --text-light: #5b6476;
  --ink: #f8fafc;
  --muted: #cbd5e1;
  --base-900: #0c0a1e;
  --base-800: #141032;
  --base-700: #1b1842;
  --glow-cyan: #37b9ff;
  --glow-teal: #21e6f3;
  --glow-green: #38ef7d;
  --glow-orange: #ff6a00;
  --glow-rose: #ff416c;
  --card: rgba(20,16,50,0.65);
  --hero-image: url('../images/WebsiteBackground.png');
}

*, *::before, *::after { box-sizing: border-box; }
html {
  scroll-behavior: smooth;
  scroll-padding-top: 6rem;
}
body {
  margin: 0;
  min-width: 0;
  overflow-x: hidden;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
  color: var(--ink);
  background:
    radial-gradient(1200px 800px at 10% -10%, #231b53 0%, transparent 60%),
    radial-gradient(1000px 700px at 110% 20%, #1d3660 0%, transparent 60%),
    linear-gradient(180deg, var(--base-800), var(--base-900));
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; }
a { color: var(--glow-cyan); text-decoration: none; }
a:hover { text-decoration: underline; }
button, a { -webkit-tap-highlight-color: transparent; }

:focus-visible {
  outline: 3px solid rgba(55,185,255,0.95);
  outline-offset: 4px;
  border-radius: 0.5rem;
}

.skip-link {
  position: fixed;
  top: 0.75rem;
  left: 0.75rem;
  z-index: 2000;
  transform: translateY(-180%);
  padding: 0.7rem 1rem;
  border-radius: 0.7rem;
  background: var(--white);
  color: var(--text-dark);
  font-weight: 700;
}
.skip-link:focus { transform: translateY(0); }

.container {
  width: min(100% - 2rem, 1200px);
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  color: var(--ink);
  background: linear-gradient(to bottom, rgba(14,12,38,0.56), rgba(14,12,38,0.28));
  border-bottom: 1px solid rgba(255,255,255,0.08);
  backdrop-filter: saturate(140%) blur(8px);
}
.site-header .header-inner {
  position: relative;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  min-height: 4.7rem;
  padding: 0.45rem 0;
}
.brand {
  min-width: 0;
  max-width: min(70vw, 18rem);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 700;
  color: var(--white);
}
.brand:hover { text-decoration: none; }
.brand img {
  width: 60px;
  height: 60px;
  flex: 0 0 auto;
  object-fit: contain;
}
.brand span {
  min-width: 0;
  font-size: clamp(1.08rem, 2.3vw, 1.45rem);
  line-height: 1.1;
  overflow-wrap: anywhere;
}

.nav-toggle {
  display: none;
  flex: 0 0 auto;
  align-items: center;
  justify-content: center;
  width: 3.35rem;
  height: 3.35rem;
  border-radius: 1rem;
  border: 1px solid rgba(255,255,255,0.24);
  background: rgba(255,255,255,0.06);
  color: var(--ink);
  cursor: pointer;
}
.nav-toggle-icon,
.nav-toggle-icon::before,
.nav-toggle-icon::after {
  display: block;
  width: 1.35rem;
  height: 2px;
  background: currentColor;
  border-radius: 2px;
}
.nav-toggle-icon { position: relative; }
.nav-toggle-icon::before,
.nav-toggle-icon::after {
  content: '';
  position: absolute;
  left: 0;
}
.nav-toggle-icon::before { top: -0.42rem; }
.nav-toggle-icon::after { top: 0.42rem; }

.site-nav {
  display: flex;
  align-items: center;
  gap: 1rem;
}
.site-nav > a {
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 600;
}
.site-nav > a:hover {
  color: var(--ink);
  text-decoration: none;
}
.site-nav .nav-cta {
  padding: 0.5rem 1rem;
  border-radius: 999px;
  background: var(--ink);
  color: #0f172a;
}
.lang-switch {
  display: inline-flex;
  align-items: center;
  margin-left: 0.5rem;
  border: 1px solid rgba(255,255,255,0.18);
  border-radius: 999px;
  padding: 2px;
  background: rgba(255,255,255,0.06);
  backdrop-filter: saturate(140%) blur(6px);
}
.lang-switch a {
  appearance: none;
  border: none;
  background: transparent;
  color: var(--muted);
  font-size: 0.84rem;
  font-weight: 700;
  padding: 0.3rem 0.65rem;
  line-height: 1;
  border-radius: 999px;
  text-align: center;
  min-width: 2.25rem;
}
.lang-switch a:hover {
  color: var(--ink);
  text-decoration: none;
}
.lang-switch a[aria-current="page"] {
  color: var(--ink);
  background: rgba(255,255,255,0.14);
}

@media (max-width: 767px) {
  .site-header .header-inner {
    min-height: 0;
    align-items: center;
  }
  .brand { max-width: calc(100% - 5rem); }
  .nav-toggle {
    display: inline-flex;
  }
  .site-nav {
    position: absolute;
    top: calc(100% + 0.25rem);
    right: 0;
    left: 0;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0.35rem;
    padding: 0.8rem 1rem 1rem;
    background: linear-gradient(to bottom, rgba(14,12,38,0.95), rgba(14,12,38,0.88));
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: 1rem;
    box-shadow: 0 18px 34px rgba(0,0,0,0.28);
  }
  .site-nav.is-open { display: flex; }
  .site-nav > a {
    margin: 0;
    padding: 0.35rem 0;
  }
  .site-nav .nav-cta {
    display: inline-flex;
    align-self: flex-start;
    margin-top: 0.25rem;
  }
  .lang-switch {
    margin-left: 0;
    margin-top: 0.35rem;
    align-self: flex-start;
  }
}

@media (max-width: 767px) {
  .brand img {
    width: 52px;
    height: 52px;
  }
  .brand span {
    font-size: clamp(1.05rem, 4.2vw, 1.3rem);
  }
}

.hero {
  position: relative;
  overflow: hidden;
  background-image: var(--hero-image);
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  color: var(--white);
}
.hero::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 56%;
  background: linear-gradient(to top, rgba(0,0,0,0.66), rgba(0,0,0,0.06));
  pointer-events: none;
  z-index: 1;
}
.hero .content {
  position: relative;
  z-index: 2;
  width: min(100% - 2rem, 1200px);
  margin: 0 auto;
  padding: 4rem 0 3rem;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}
.hero h1 {
  max-width: 13ch;
  font-size: clamp(2.2rem, 4.8vw, 3.45rem);
  font-weight: 750;
  line-height: 1.08;
  margin: 0 0 0.9rem;
  color: var(--white);
  text-wrap: balance;
}
.hero h1 span { display: block; }
.hero p {
  font-size: clamp(1rem, 1.7vw, 1.1rem);
  max-width: 600px;
  margin: 0 0 1.5rem 0;
  color: rgba(255, 255, 255, 0.92);
}
.hero .actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 1.5rem;
}
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  border-radius: 1rem;
  font-weight: 650;
  font-size: 1rem;
  border: 1px solid transparent;
  min-height: 3.1rem;
  text-align: center;
}
.button:hover { text-decoration: none; }
.button.primary {
  background: var(--primary);
  color: var(--white);
}
.button.primary:hover { opacity: 0.92; }
.button.secondary {
  border: 1px solid rgba(255,255,255,0.25);
  color: var(--ink);
  background: rgba(255,255,255,0.08);
}
.button.secondary:hover {
  background: rgba(255,255,255,0.16);
}
.hero .feature-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1rem;
  max-width: 600px;
  font-size: 0.95rem;
  color: var(--white);
  padding: 0;
  margin: 0;
}
.hero .feature-list li {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  list-style: none;
}
.hero .feature-list li::before {
  content: '';
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--white);
  flex: 0 0 auto;
}

@media (min-width: 768px) {
  .hero {
    min-height: 82svh;
    display: flex;
    align-items: flex-end;
  }
  .hero .content {
    padding: 6rem 0 3rem;
  }
}
@media (max-width: 767px) {
  html { scroll-padding-top: 5rem; }
  .hero {
    min-height: auto;
  }
  .hero .content {
    padding: 2.25rem 0 2.75rem;
  }
  .hero h1 {
    max-width: 11.5ch;
    font-size: clamp(2rem, 8.3vw, 2.75rem);
  }
  .hero p {
    max-width: 34rem;
  }
  .hero .feature-list {
    grid-template-columns: 1fr;
  }
}
@media (max-height: 620px) {
  .hero {
    min-height: auto;
  }
  .hero .content {
    padding-top: 2.5rem;
    padding-bottom: 2.75rem;
  }
}

.section {
  padding: 4rem 1rem;
  background: linear-gradient(180deg, var(--base-800), var(--base-900));
}
.section.light {
  background:
    radial-gradient(40rem 26rem at 15% 10%, rgba(55,185,255,0.18), transparent 60%),
    radial-gradient(36rem 24rem at 85% 20%, rgba(33,230,243,0.16), transparent 60%),
    radial-gradient(44rem 28rem at 50% 120%, rgba(255,106,0,0.12), transparent 65%),
    linear-gradient(180deg, var(--base-800), var(--base-900));
  border-top: 1px solid rgba(226,232,240,0.08);
  border-bottom: 1px solid rgba(226,232,240,0.08);
}
.section h2 {
  font-size: clamp(1.95rem, 4.2vw, 3rem);
  font-weight: 700;
  margin: 0 0 1rem;
  color: var(--ink);
  text-wrap: balance;
}
.section p {
  color: var(--muted);
  margin-bottom: 1rem;
}
.two-column,
.science-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}
@media (min-width: 992px) {
  .two-column,
  .science-grid {
    grid-template-columns: 1fr 1fr;
    align-items: flex-start;
  }
}
.steps {
  padding-left: 0;
  margin: 0;
}
.steps li {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
  color: var(--muted);
  list-style: none;
}
.step-number {
  font-weight: 700;
  color: var(--glow-cyan);
}

.side-card,
.light-card {
  background: var(--white);
  border: 1px solid #e5e7eb;
  border-radius: 1rem;
  padding: 1.5rem;
  box-shadow: 0 10px 22px rgba(0, 0, 0, 0.10);
}
.side-card h3,
.light-card h3 {
  margin: 0 0 0.5rem;
  color: var(--primary);
  font-size: 1.25rem;
}
.side-card p,
.side-card li,
.light-card p,
.light-card li {
  color: var(--text-light);
}
.side-card ul,
.light-card ul {
  margin: 0;
  padding-left: 1.2rem;
}
.side-card ul li,
.light-card ul li { margin-bottom: 0.6rem; }
.note {
  margin-top: 1rem;
  padding: 1rem;
  background: rgba(20,16,50,0.08);
  border: 1px solid rgba(20,16,50,0.08);
  border-radius: 0.75rem;
  font-size: 0.95rem;
  color: var(--text-light);
}
.note strong { color: var(--primary); }
.alert {
  margin-top: 1rem;
  padding: 1rem;
  background: #fffbeb;
  border: 1px solid #f7cf74;
  border-radius: 0.75rem;
  font-size: 0.95rem;
  color: #9a650e;
}
.alert strong { color: #8d5600; }

/* Benefits */
.benefits-grid {
  display: grid;
  gap: 2.25rem;
  margin-top: 2.5rem;
  max-width: 850px;
  margin-left: auto;
  margin-right: auto;
}
@media (max-width: 799px) {
  .benefits-grid {
    grid-template-columns: 1fr;
  }
}
@media (min-width: 800px) {
  .benefits-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 3.25rem;
    row-gap: 2.75rem;
  }
  .benefits-grid .light-card:nth-child(4n + 1),
  .benefits-grid .light-card:nth-child(4n + 2) {
    transform: translateX(-125px);
  }
  .benefits-grid .light-card:nth-child(4n + 3),
  .benefits-grid .light-card:nth-child(4n + 4) {
    transform: translateX(100px);
  }
}
.benefits-grid .light-card {
  border-radius: 1.15rem;
  padding: 1.75rem;
  transition: box-shadow 0.18s ease;
}
@media (hover: hover) {
  .benefits-grid .light-card:hover {
    box-shadow: 0 14px 30px rgba(0, 0, 0, 0.14);
  }
}
.benefits-grid .light-card h3 {
  margin-bottom: 0.6rem;
  font-size: 1.15rem;
}
.benefits-grid .light-card p {
  font-size: 0.95rem;
  line-height: 1.65;
}

.science-grid > .science-toggle {
  justify-self: start;
  margin-top: -0.75rem;
}

@media (min-width: 992px) {
  .science-grid > .science-toggle {
    grid-column: 1;
  }
}

/* Science read more */
.science-more-wrap {
  margin-top: 0.95rem;
}
.science-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  margin-top: 0.25rem;
  padding: 0.78rem 1.2rem;
  border-radius: 999px;
  border: 1px solid rgba(255,255,255,0.18);
  background: rgba(255,255,255,0.08);
  color: var(--ink);
  font-weight: 650;
  cursor: pointer;
  user-select: none;
  transition: background 0.2s ease, transform 0.2s ease, border-color 0.2s ease;
}
.science-toggle:hover {
  background: rgba(255,255,255,0.14);
  border-color: rgba(55,185,255,0.45);
}
.science-toggle svg {
  width: 1rem;
  height: 1rem;
  transition: transform 0.25s ease;
}
.science-toggle[aria-expanded="true"] svg {
  transform: rotate(180deg);
}
.science-collapse {
  overflow: hidden;
  max-height: 0;
  opacity: 0;
  transition: max-height 0.35s ease, opacity 0.25s ease;
}
.science-collapse.is-open {
  opacity: 1;
}
.science-extra {
  margin-top: 1rem;
  padding: 1.15rem 1.3rem;
  border-radius: 1rem;
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.10);
  color: var(--muted);
}
.science-extra h3 {
  margin: 0 0 0.65rem;
  color: var(--ink);
  font-size: 1.15rem;
}
.science-extra p:last-child { margin-bottom: 0; }

/* Safety */
.safety-grid {
  display: grid;
  gap: 2.25rem;
  margin-top: 2.5rem;
  max-width: 1050px;
  margin-left: auto;
  margin-right: auto;
}
@media (max-width: 799px) {
  .safety-grid {
    grid-template-columns: 1fr;
  }
}
@media (min-width: 800px) {
  .safety-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 3.25rem;
    row-gap: 2.75rem;
  }
  .safety-grid .light-card:nth-child(1) { transform: translateX(-18px); }
  .safety-grid .light-card:nth-child(2) { transform: translateX(18px); }
  .safety-grid .light-card:nth-child(3) {
    grid-column: 1 / -1;
    justify-self: center;
    max-width: 520px;
    width: 100%;
    transform: none;
  }
}
.safety-grid .light-card {
  border-radius: 1.15rem;
  padding: 1.75rem;
}
.safety-grid .light-card h3 {
  margin-bottom: 0.6rem;
  font-size: 1.15rem;
}
.safety-grid .light-card p {
  font-size: 0.95rem;
}

/* Contact */
.contact-shell {
  max-width: 760px;
  text-align: center;
}
.contact-shell h2,
.contact-shell p {
  text-align: center;
}
.contact-card {
  margin: 1.75rem auto 0;
  max-width: 520px;
  padding: 1.5rem;
  background: var(--card);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 1rem;
}
.contact-card dl {
  margin: 0;
  display: grid;
  gap: 1rem;
}
.contact-card dt {
  color: var(--muted);
  font-size: 0.92rem;
  margin-bottom: 0.2rem;
}
.contact-card dd {
  margin: 0;
}
.contact-card a {
  color: var(--ink);
  font-size: 1.15rem;
  font-weight: 650;
  text-decoration: underline;
  text-underline-offset: 0.15em;
}
.contact-card a:hover {
  text-decoration-color: var(--glow-cyan);
}

.site-footer {
  background: linear-gradient(to bottom, rgba(14,12,38,0.84), rgba(12,10,30,0.96));
  border-top: 1px solid rgba(255,255,255,0.08);
  padding: 2rem 1rem;
}
.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 1rem;
}
@media (min-width: 768px) {
  .footer-inner {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }
}
.footer-brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--ink);
}
.footer-mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 0.65rem;
  background: rgba(255,255,255,0.08);
  font-size: 0.85rem;
  font-weight: 700;
}
.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}
.footer-links a {
  color: var(--muted);
  font-size: 0.92rem;
}
.footer-links a:hover {
  color: var(--ink);
  text-decoration: none;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}