:root {
  --navy:        #142b58;
  --slate:       #465c8a;
  --orange:      #f27c36;
  --orange-soft: #f2ab52;
  --white:       #ffffff;

  --text:        #ffffff;
  --text-soft:   rgba(255,255,255,0.82);
  --text-muted:  rgba(255,255,255,0.60);
  --text-faint:  rgba(255,255,255,0.42);

  --line:        rgba(70,92,138,0.45);
  --line-strong: rgba(70,92,138,0.75);

  --surface:      rgba(20,43,88,0.75);
  --surface-2:    rgba(20,43,88,0.92);
  --section-veil: rgba(20,43,88,0.01);

  --orange-dim:  rgba(242,124,54,0.16);
  --orange-line: rgba(242,124,54,0.55);
  --softor-dim:  rgba(242,171,82,0.16);
  --softor-line: rgba(242,171,82,0.55);

  --font-display: "Space Grotesk", system-ui, -apple-system, sans-serif;
  --font-body:    "Inter", system-ui, -apple-system, sans-serif;
  --font-mono:    "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, monospace;

  --r-sm: 8px;
  --r-md: 12px;
  --r-lg: 18px;

  --maxw: 1120px;
  --shadow: 0 24px 60px -26px rgba(20,43,88,0.90);
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--navy);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
img, video { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
:focus-visible { outline: 2px solid var(--orange); outline-offset: 3px; border-radius: 4px; }

.container { width: 100%; max-width: var(--maxw); margin-inline: auto; padding-inline: 24px; }
.mono { font-family: var(--font-mono); }
.muted { color: var(--text-faint); }
.visually-hidden {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}
.skip-link {
  position: absolute; left: 16px; top: -48px; z-index: 200;
  background: var(--orange); color: var(--navy); padding: 10px 16px;
  border-radius: var(--r-sm); font-weight: 700; transition: top .2s;
}
.skip-link:focus { top: 16px; }

.bg-video { position: fixed; inset: 0; z-index: -2; overflow: hidden; background: var(--navy); }
.bg-video__media { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; filter: brightness(1); }
.bg-video__overlay {
  position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(20,43,88,0.5), rgba(20,43,88,0.30));
}

.section {
  padding: clamp(64px, 9vw, 124px) 0; position: relative;
  background: var(--section-veil);
  border-top: 1px solid var(--line);
}
.section__title {
  font-family: var(--font-display); font-weight: 600;
  font-size: clamp(1.7rem, 3.6vw, 2.7rem); line-height: 1.12;
  letter-spacing: -0.02em; margin: 0 0 1rem; max-width: 18ch; color: var(--white);
}
.section__lead {
  color: var(--text-soft);
  font-size: clamp(1.02rem, 1.4vw, 1.18rem); max-width: 60ch; margin: 0;
}

.eyebrow {
  font-family: var(--font-mono); font-size: 1rem; letter-spacing: 0.08em;
  text-transform: uppercase; color: var(--orange); margin: 0 0 0.9rem;
  display: inline-flex; align-items: center; gap: 0.5ch;
}
.eyebrow::before { content: ""; width: 18px; height: 1px; background: var(--orange-line); }
.eyebrow--danger { color: var(--orange-soft); }
.eyebrow--danger::before { background: var(--softor-line); }
.eyebrow--human { color: var(--orange-soft); }
.eyebrow--human::before { background: var(--softor-line); }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 0.6ch;
  font-family: var(--font-body); font-weight: 600; font-size: 0.98rem;
  padding: 0.85em 1.4em; border-radius: var(--r-sm);
  border: 1px solid transparent; cursor: pointer;
  transition: transform .15s ease, background .2s ease, border-color .2s ease, color .2s ease;
}
.btn--primary { background: var(--orange); color: var(--navy); }
.btn--primary:hover { transform: translateY(-2px); background: var(--orange-soft); }
.btn--ghost { background: transparent; color: var(--white); border-color: var(--line-strong); }
.btn--ghost:hover { border-color: var(--orange-line); color: var(--orange); transform: translateY(-2px); }

.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(20,43,88,0.72); backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent; transition: border-color .3s, background .3s;
}
.site-header.is-scrolled { border-bottom-color: var(--line); background: rgba(20,43,88,0.94); }
.site-header__inner { display: flex; align-items: center; gap: 24px; height: 68px; }
.brand { display: inline-flex; align-items: center; }
.brand__logo { height: 47px; width: auto; }
.site-nav { margin-left: auto; display: flex; align-items: center; gap: 28px; }
.site-nav > a { color: var(--text-soft); font-size: 0.95rem; transition: color .2s; }
.site-nav > a:hover { color: var(--white); }
.site-nav__cta {
  color: var(--orange) !important; border: 1px solid var(--orange-line);
  padding: 0.5em 1.1em; border-radius: var(--r-sm);
}
.site-nav__cta:hover { background: var(--orange-dim); }
.header-tools { display: flex; align-items: center; gap: 12px; margin-left: 8px; }
.lang__select {
  appearance: none; background: transparent; color: var(--text-soft);
  border: 1px solid var(--line); border-radius: var(--r-sm);
  padding: 0.45em 1.9em 0.45em 0.8em; font-family: var(--font-mono);
  font-size: 0.8rem; cursor: pointer;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6' viewBox='0 0 10 6'%3E%3Cpath d='M1 1l4 4 4-4' stroke='%23ffffff' stroke-width='1.4' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat; background-position: right 0.7em center;
}
.lang__select option { background: var(--navy); color: var(--white); }

.nav-toggle {
  display: none; width: 42px; height: 42px; border: 1px solid var(--line);
  border-radius: var(--r-sm); background: transparent; cursor: pointer;
  padding: 0; flex-direction: column; gap: 5px; align-items: center; justify-content: center;
}
.nav-toggle span { width: 18px; height: 1.6px; background: var(--white); transition: transform .25s, opacity .2s; }
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(6.6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-6.6px) rotate(-45deg); }

.mobile-nav { border-top: 1px solid var(--line); padding: 8px 24px 20px; background: rgba(20,43,88,0.96); }
.mobile-nav a { display: block; padding: 12px 0; color: var(--text-soft); border-bottom: 1px solid var(--line); }
.mobile-nav__cta { color: var(--orange) !important; font-weight: 600; }

.hero {
  position: relative; min-height: 88vh; display: flex; align-items: center;
  padding: clamp(48px, 8vw, 96px) 0; overflow: hidden;
  background: linear-gradient(100deg, rgba(20,43,88,0.74) 0%, rgba(20,43,88,0.32) 52%, rgba(20,43,88,0.06) 100%);
}
.hero__inner {
  position: relative; z-index: 2;
  display: grid; grid-template-columns: 1.25fr 0.9fr; gap: clamp(32px, 5vw, 72px); align-items: center;
}
.hero__title {
  font-family: var(--font-display); font-weight: 700;
  font-size: clamp(2.1rem, 5.4vw, 3.9rem); line-height: 1.04;
  letter-spacing: -0.025em; margin: 0 0 1.1rem; max-width: 16ch; color: var(--white);
  text-shadow: 0 2px 18px rgba(20,43,88,0.55);
}
.hero__subhead {
  color: var(--text-soft); font-size: clamp(1.04rem, 1.5vw, 1.22rem); max-width: 52ch; margin: 0 0 2rem;
  text-shadow: 0 1px 12px rgba(20,43,88,0.55);
}
.hero__actions { display: flex; flex-wrap: wrap; gap: 14px; }

.problem__inner { max-width: 760px; }
.problem .section__title { max-width: 22ch; }

.trail { list-style: none; margin: 2.6rem 0 0; padding: 0; position: relative; max-width: 720px; }
.trail::before {
  content: ""; position: absolute; left: 19px; top: 8px; bottom: 8px;
  width: 2px; background: linear-gradient(180deg, var(--orange-line), var(--line)); opacity: .7;
}
.trail__step { position: relative; display: grid; grid-template-columns: 40px 1fr; gap: 22px; padding: 0 0 2.2rem; }
.trail__step:last-child { padding-bottom: 0; }
.trail__index {
  position: relative; z-index: 1; width: 40px; height: 40px; border-radius: 50%;
  display: grid; place-items: center;
  font-family: var(--font-mono); font-size: 0.85rem; color: var(--text-muted);
  background: var(--surface-2); border: 1px solid var(--line-strong);
  transition: color .4s, border-color .4s, background .4s, box-shadow .4s;
}
.trail__title { font-family: var(--font-display); font-weight: 600; font-size: 1.2rem; margin: 0.4rem 0 0.4rem; color: var(--white); }
.trail__body p { color: var(--text-soft); margin: 0; max-width: 52ch; }
.trail__step.is-in .trail__index { color: var(--orange); border-color: var(--orange-line); box-shadow: 0 0 0 4px var(--orange-dim); }
.trail__step--human.is-in .trail__index { color: var(--orange-soft); border-color: var(--softor-line); box-shadow: 0 0 0 4px var(--softor-dim); }
.how__example { color: var(--text-faint); font-size: 1rem; margin: 1.8rem 0 0; padding-left: 62px; }

.sol-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.sol {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--r-lg);
  padding: 26px 24px 24px; position: relative; overflow: hidden;
}
.sol::before { content: ""; position: absolute; left: 0; top: 0; height: 3px; width: 100%; background: var(--orange); opacity: .9; }
.sol--human::before { background: var(--orange-soft); }
.sol__title { font-family: var(--font-display); font-weight: 600; font-size: 1.28rem; line-height: 1.18; margin: 0 0 0.7rem; color: var(--white); }
.sol__body { color: var(--text-soft); margin: 0; font-size: 0.98rem; }
.glossary {
  margin: 1.2rem 0 0; padding: 12px 14px; border-radius: var(--r-md);
  background: var(--orange-dim); border: 1px solid var(--orange-line);
  font-size: 0.88rem; color: var(--text-soft);
}
.glossary__term { font-family: var(--font-mono); font-style: normal; font-weight: 500; color: var(--orange); display: block; margin-bottom: 2px; }

.diff-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin-top: 2.2rem; }
.diff-card { border-radius: var(--r-lg); padding: 24px; border: 1px solid var(--line); }
.diff-card p:last-child { margin: 0; color: var(--text-soft); }
.diff-card--muted { background: rgba(70,92,138,0.18); }
.diff-card--accent { background: var(--surface); border-color: var(--orange-line); }
.diff-card__label { font-size: 0.78rem; letter-spacing: 0.06em; text-transform: uppercase; margin: 0 0 0.7rem; }
.diff-card--muted .diff-card__label { color: var(--text-muted); }
.diff-card--accent .diff-card__label { color: var(--orange); }

.who-grid { list-style: none; margin: 2.2rem 0 0; padding: 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.who-card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--r-lg); padding: 24px; }
.who-card__title { font-family: var(--font-display); font-weight: 600; font-size: 1.12rem; margin: 0 0 0.6rem; color: var(--white); }
.who-card p { color: var(--text-soft); margin: 0; font-size: 0.96rem; }

.about__inner { max-width: 760px; }

.faq__inner { max-width: 800px; }
.qa { border-bottom: 1px solid var(--line); padding: 4px 0; }
.qa summary {
  list-style: none; cursor: pointer; padding: 18px 36px 18px 0; position: relative;
  font-family: var(--font-display); font-weight: 500; font-size: 1.1rem; color: var(--white);
}
.qa summary::-webkit-details-marker { display: none; }
.qa summary::after {
  content: "+"; position: absolute; right: 6px; top: 50%; transform: translateY(-50%);
  font-family: var(--font-mono); color: var(--orange); font-size: 1.3rem; transition: transform .25s;
}
.qa[open] summary::after { content: "−"; }
.qa p { color: var(--text-soft); margin: 0 0 18px; max-width: 64ch; }

.contact__inner { max-width: 760px; }
.contact__info {
  display: inline-flex; flex-wrap: wrap; align-items: baseline; gap: 0.75ch;
  margin: 1.6rem 0 0; padding: 16px 20px;
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--r-md);
  font-size: 1rem;
}
.contact__label { color: var(--text-muted); letter-spacing: 0.04em; }
.contact__info a { color: var(--orange); border-bottom: 1px solid var(--orange-line); }
.contact__info a:hover { color: var(--orange-soft); }

.site-footer { background: rgba(20,43,88,0.94); border-top: 1px solid var(--line); padding: 56px 0 40px; position: relative; }
.site-footer__inner { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 32px; align-items: start; }
.site-footer__brand .brand__logo { height: 47px; margin-bottom: 14px; }
.site-footer__brand p { color: var(--text-faint); font-size: 0.82rem; margin: 0; }
.site-footer__nav { display: flex; flex-direction: column; gap: 12px; }
.site-footer__nav a { color: var(--text-soft); font-size: 0.95rem; }
.site-footer__nav a:hover { color: var(--orange); }
.site-footer__legal { font-style: normal; color: var(--text-soft); font-size: 0.88rem; line-height: 1.8; }

.js-reveal { opacity: 0; transform: translateY(18px); }
.js-reveal.is-in { opacity: 1; transform: none; transition: opacity .6s ease, transform .6s ease; }

@media (max-width: 880px) {
  .site-nav { display: none; }
  .nav-toggle { display: inline-flex; }
  .hero__inner { grid-template-columns: 1fr; }
  .sol-grid, .who-grid { grid-template-columns: 1fr; }
  .diff-grid { grid-template-columns: 1fr; }
  .site-footer__inner { grid-template-columns: 1fr; gap: 28px; }
}
@media (min-width: 881px) { .mobile-nav { display: none !important; } }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .001ms !important; animation-iteration-count: 1 !important; transition-duration: .001ms !important; }
  .js-reveal { opacity: 1 !important; transform: none !important; }
}

.legal { padding: clamp(56px, 8vw, 96px) 0; min-height: 70vh; }
.legal__inner { max-width: 760px; }
.legal h1 { font-family: var(--font-display); font-weight: 600; font-size: clamp(1.8rem,4vw,2.6rem); letter-spacing: -0.02em; margin: 0 0 0.4rem; color: var(--white); }
.legal__updated { font-family: var(--font-mono); font-size: 0.8rem; color: var(--text-faint); margin: 0 0 2.4rem; }
.legal h2 { font-family: var(--font-display); font-weight: 600; font-size: 1.3rem; margin: 2.2rem 0 0.6rem; color: var(--white); }
.legal p, .legal li { color: var(--text-soft); }
.legal a { color: var(--orange); border-bottom: 1px solid var(--orange-line); }
.legal .back { display: inline-block; margin-top: 2.6rem; font-family: var(--font-mono); font-size: 0.85rem; color: var(--orange); }