@font-face {
  font-family: "JetBrains Mono";
  src: url("/fonts/JetBrainsMono-Regular.woff2") format("woff2");
  font-display: swap;
}

:root {
  color-scheme: dark;
  --bg: #000000;
  --text-primary: #ffffff;
  --text-secondary: #888888;
  --line: #333333;
  --line-strong: #ffffff;
  --page-pad: 5rem;
  --max-width: 1200px;
  font-family: "JetBrains Mono", "Courier New", monospace;
  font-weight: 400;
  background: var(--bg);
  color: var(--text-primary);
}

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

html {
  min-width: 320px;
  scroll-behavior: smooth;
  background: var(--bg);
}

body {
  min-width: 320px;
  min-height: 100vh;
  margin: 0;
  overflow-x: hidden;
  background: var(--bg);
  color: var(--text-primary);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

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

a:focus-visible, button:focus-visible {
  outline: 1px solid var(--text-primary);
  outline-offset: 4px;
}

button, a {
  -webkit-tap-highlight-color: transparent;
}

#app {
  min-height: 100vh;
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 10;
  display: grid;
  width: 100%;
  grid-template-columns: minmax(150px, 1fr) auto minmax(150px, 1fr);
  align-items: center;
  gap: 2rem;
  padding: 2rem var(--page-pad);
  background: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(12px);
  transition: padding 0.4s ease, border-color 0.4s ease;
  border-bottom: 1px solid transparent;
}

.site-header.is-scrolled {
  padding-top: 1rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--line);
}

.brandmark,
.nav-cta,
.site-nav a,
.eyebrow,
.card-topline,
.method-index,
.board-header,
.hero-telemetry,
.email-link,
.button {
  font-family: "JetBrains Mono", "Courier New", monospace;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.brandmark {
  display: inline-flex;
  align-items: center;
  gap: 1rem;
  color: var(--text-primary);
}

.brandmark-symbol {
  display: grid;
  width: 2rem;
  height: 2rem;
  place-items: center;
  border: 1px solid var(--text-primary);
  background: transparent;
  color: var(--text-primary);
}

.site-nav {
  display: flex;
  gap: 2.5rem;
}

.site-nav a {
  color: var(--text-secondary);
  transition: color 0.3s ease;
  position: relative;
}

.site-nav a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0%;
  height: 1px;
  background: var(--text-primary);
  transition: width 0.3s ease;
}

.site-nav a:hover {
  color: var(--text-primary);
}

.site-nav a:hover::after {
  width: 100%;
}

.nav-cta {
  justify-self: end;
  padding: 0.8rem 1.5rem;
  border: 1px solid var(--line);
  color: var(--text-primary);
  transition: background 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}

.nav-cta:hover {
  background: var(--text-primary);
  color: var(--bg);
  border-color: var(--text-primary);
}

h1, h2, h3 {
  font-family: "Playfair Display", serif;
  font-weight: 400;
  margin-top: 0;
  letter-spacing: -0.02em;
}

p {
  margin-top: 0;
  font-family: "Playfair Display", serif;
}

.hero {
  position: relative;
  display: grid;
  min-height: 100svh;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  align-items: center;
  padding: 12rem var(--page-pad) 6rem;
  border-bottom: 1px solid var(--line);
}

.hero-scene {
  position: fixed;
  inset: 0;
  z-index: 0; /* Changed from -1 to 0 to ensure visibility */
  overflow: hidden;
  pointer-events: none;
  opacity: 0.6;
}

.hero-scene canvas {
  display: block;
  width: 100%;
  height: 100%;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 48rem;
  grid-column: 1 / -1;
}

.hero h1 {
  margin-bottom: 2rem;
  color: var(--text-primary);
  font-size: clamp(4rem, 10vw, 8rem);
  line-height: 0.95;
}

.hero-copy {
  max-width: 40rem;
  margin-bottom: 4rem;
  color: var(--text-secondary);
  font-size: clamp(1.2rem, 2vw, 1.8rem);
  line-height: 1.4;
}

.hero-actions,
.contact-actions {
  display: flex;
  gap: 1.5rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 1.2rem 2rem;
  border: 1px solid var(--line);
  transition: background 0.3s ease, color 0.3s ease, border-color 0.3s ease;
  background: transparent;
  color: var(--text-primary);
}

.button-primary {
  border-color: var(--text-primary);
}

.button-primary:hover {
  background: var(--text-primary);
  color: var(--bg);
}

.button-secondary:hover {
  border-color: var(--text-primary);
}

.hero-telemetry {
  position: absolute;
  right: var(--page-pad);
  bottom: 4rem;
  z-index: 2;
  width: 20rem;
  padding: 2rem;
  border: 1px solid var(--line);
  background: var(--bg);
  color: var(--text-secondary);
}

.hero-telemetry p {
  font-family: "JetBrains Mono", monospace;
  margin-bottom: 1.5rem;
  color: var(--text-primary);
}

.hero-telemetry ul {
  display: grid;
  gap: 1rem;
  padding: 0;
  margin: 0;
  list-style: none;
}

.hero-telemetry li {
  display: flex;
  justify-content: space-between;
  border-bottom: 1px solid var(--line);
  padding-bottom: 0.5rem;
}

.hero-telemetry li:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.hero-telemetry strong {
  color: var(--text-primary);
  font-weight: 400;
}

.section {
  position: relative;
  z-index: 1; /* Keep content above canvas */
  width: 100%;
  padding: 10rem var(--page-pad);
  border-bottom: 1px solid var(--line);
}

.eyebrow {
  margin: 0 0 2rem;
  color: var(--text-secondary);
  display: block;
}

.section-heading {
  max-width: 50rem;
  margin-bottom: 6rem;
}

.section-heading h2,
.platform-copy h2,
.contact-inner h2 {
  margin-bottom: 2rem;
  color: var(--text-primary);
  font-size: clamp(2.5rem, 5vw, 4rem);
  line-height: 1.1;
}

.capability-grid {
  display: grid;
  max-width: var(--max-width);
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  border: 1px solid var(--line);
  background: var(--bg); /* Opaque backgrounds for cards so text is readable over canvas */
}

.capability-card {
  padding: 3rem 2rem;
  border-right: 1px solid var(--line);
  transition: background 0.4s ease;
  background: var(--bg);
}

.capability-card:last-child {
  border-right: none;
}

.capability-card:hover {
  background: #0a0a0a;
}

.card-topline {
  display: flex;
  justify-content: space-between;
  margin-bottom: 4rem;
  color: var(--text-secondary);
}

.capability-card h3,
.use-case h3,
.method-step h3 {
  font-size: 1.8rem;
  margin-bottom: 1.5rem;
}

.capability-card p,
.use-case p,
.method-step span {
  color: var(--text-secondary);
  font-size: 1.1rem;
  line-height: 1.6;
}

.platform-section {
  display: grid;
  max-width: none;
  grid-template-columns: 1fr 1fr;
  gap: 8rem;
  align-items: center;
}

.platform-copy {
  max-width: 45rem;
}

.platform-copy p {
  color: var(--text-secondary);
  font-size: 1.2rem;
  line-height: 1.6;
}

.platform-board {
  border: 1px solid var(--line);
  background: var(--bg);
}

.board-header {
  display: flex;
  justify-content: space-between;
  padding: 1.5rem;
  border-bottom: 1px solid var(--line);
  color: var(--text-secondary);
}

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

.platform-board li {
  padding: 1.5rem;
  border-bottom: 1px solid var(--line);
  color: var(--text-primary);
  font-family: "JetBrains Mono", monospace;
  font-size: 0.85rem;
  display: flex;
  align-items: center;
}

.platform-board li::before {
  content: "";
  display: block;
  width: 4px;
  height: 4px;
  background: var(--text-primary);
  margin-right: 1.5rem;
}

.platform-board li:last-child {
  border-bottom: 0;
}

.method-grid {
  display: grid;
  max-width: var(--max-width);
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  border: 1px solid var(--line);
  background: var(--bg);
}

.method-step {
  padding: 3rem 2rem;
  border-right: 1px solid var(--line);
  display: flex;
  flex-direction: column;
}

.method-step:last-child {
  border-right: none;
}

.method-index {
  margin-bottom: 4rem;
  color: var(--text-secondary);
}

.method-step p {
  font-family: "JetBrains Mono", monospace;
  font-size: 0.75rem;
  text-transform: uppercase;
  color: var(--text-primary);
  margin-bottom: 1rem;
  letter-spacing: 0.05em;
}

.use-case-grid {
  display: grid;
  max-width: var(--max-width);
  grid-template-columns: 1fr 1fr;
  gap: 0;
  border: 1px solid var(--line);
  background: var(--bg);
}

.use-case {
  padding: 4rem 3rem;
  border-bottom: 1px solid var(--line);
  border-right: 1px solid var(--line);
}

.use-case:nth-child(2n) {
  border-right: none;
}

.use-case:nth-last-child(-n+2) {
  border-bottom: none;
}

.contact-section {
  padding: 10rem var(--page-pad);
  border-bottom: none;
}

.contact-inner {
  max-width: var(--max-width);
  padding: 6rem;
  border: 1px solid var(--line);
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  background: var(--bg);
}

.contact-inner p {
  max-width: 40rem;
  margin: 0 auto 3rem;
  color: var(--text-secondary);
  font-size: 1.2rem;
  line-height: 1.6;
}

.email-link {
  color: var(--text-secondary);
  transition: color 0.3s ease;
  margin-top: 1rem;
}

.email-link:hover {
  color: var(--text-primary);
}

.reveal {
  opacity: 0;
  transform: translate(var(--start-x, 0px), var(--start-y, 40px));
  transition: opacity 1.2s cubic-bezier(0.16, 1, 0.3, 1), transform 1.2s cubic-bezier(0.16, 1, 0.3, 1);
  transition-delay: calc(var(--index, 0) * 80ms);
}

.reveal.is-visible {
  opacity: 1;
  transform: translate(0, 0);
}

@media (max-width: 1100px) {
  :root {
    --page-pad: 3rem;
  }
  .capability-grid {
    grid-template-columns: 1fr 1fr;
  }
  .capability-card:nth-child(2n) {
    border-right: none;
  }
  .capability-card:nth-child(-n+2) {
    border-bottom: none;
  }
  .capability-card {
    border-bottom: 1px solid var(--line);
  }
}

@media (max-width: 820px) {
  :root {
    --page-pad: 1.5rem;
  }
  .site-header {
    grid-template-columns: 1fr;
    gap: 1rem;
    padding: 1.5rem var(--page-pad);
  }
  .site-nav, .nav-cta {
    display: none;
  }
  .hero {
    padding: 8rem var(--page-pad) 4rem;
    grid-template-columns: 1fr;
  }
  .hero-telemetry {
    position: relative;
    right: auto;
    bottom: auto;
    width: 100%;
    margin-top: 4rem;
  }
  .platform-section {
    grid-template-columns: 1fr;
    gap: 4rem;
  }
  .method-grid {
    grid-template-columns: 1fr;
  }
  .method-step {
    border-right: none;
    border-bottom: 1px solid var(--line);
  }
  .method-step:last-child {
    border-bottom: none;
  }
  .use-case-grid {
    grid-template-columns: 1fr;
  }
  .use-case {
    border-right: none;
    border-bottom: 1px solid var(--line);
  }
  .contact-inner {
    padding: 3rem 1.5rem;
  }
}

/* Language Toggle Logic */
html[lang="en"] .lang-zh {
  display: none !important;
}
html[lang="zh"] .lang-en {
  display: none !important;
}

.lang-toggle {
  color: var(--text-secondary);
  transition: color 0.3s ease;
}
.lang-toggle:hover {
  color: var(--text-primary);
}