:root {
  color-scheme: dark;
  --ink: #071021;
  --ink-soft: #101a2d;
  --navy: #040b1f;
  --blue: #2878ff;
  --cyan: #4ee7ff;
  --red: #e84f5f;
  --paper: #f4f7fb;
  --white: #ffffff;
  --muted: #a9b7d1;
  --line: rgba(255, 255, 255, 0.17);
  --shell: 1420px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-width: 320px;
  overflow-x: hidden;
  background: var(--navy);
  color: var(--white);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  letter-spacing: 0;
}

a { color: inherit; text-decoration: none; }
button, a { -webkit-tap-highlight-color: transparent; }
button, input, textarea, select { font: inherit; letter-spacing: 0; }

:focus-visible {
  outline: 3px solid var(--cyan);
  outline-offset: 3px;
}

.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 100;
  transform: translateY(-150%);
  padding: 10px 14px;
  background: var(--white);
  color: var(--ink);
}
.skip-link:focus { transform: translateY(0); }

.site-header {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  z-index: 20;
  min-height: 78px;
  display: grid;
  grid-template-columns: minmax(210px, 1fr) auto minmax(210px, 1fr);
  align-items: center;
  gap: 30px;
  padding: 14px max(34px, calc((100vw - var(--shell)) / 2));
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  background: rgba(3, 9, 27, 0.82);
  backdrop-filter: blur(16px);
}

.brand { display: inline-flex; align-items: center; gap: 12px; width: max-content; }
.brand-mark {
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  clip-path: polygon(50% 0, 94% 24%, 86% 76%, 50% 100%, 14% 76%, 6% 24%);
  background: #dcecff;
  box-shadow: 0 0 24px rgba(78, 231, 255, 0.7);
}
.brand-mark span {
  width: 18px;
  height: 24px;
  clip-path: polygon(50% 0, 100% 100%, 50% 75%, 0 100%);
  background: var(--blue);
}
.brand-copy { display: flex; align-items: baseline; gap: 9px; white-space: nowrap; }
.brand-copy strong { font-size: 28px; font-style: italic; line-height: 1; }
.brand-copy small { color: #d9e5f6; font-size: 12px; }

.main-nav { display: flex; align-items: center; gap: 34px; }
.main-nav a { position: relative; padding: 15px 0; color: #d8e2f3; font-size: 15px; font-weight: 700; }
.main-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 4px;
  height: 2px;
  transform: scaleX(0);
  background: var(--cyan);
  transition: transform 180ms ease;
}
.main-nav a:hover::after, .main-nav a.is-active::after { transform: scaleX(1); }
.main-nav a.is-active { color: var(--cyan); }

.header-actions { justify-self: end; display: flex; align-items: center; gap: 12px; }
.button {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  border: 1px solid transparent;
  border-radius: 6px;
  padding: 0 22px;
  color: var(--white);
  font-weight: 750;
  cursor: pointer;
  transition: transform 180ms ease, background 180ms ease, border-color 180ms ease;
}
.button:hover { transform: translateY(-2px); }
.button-primary { background: var(--blue); box-shadow: 0 12px 30px rgba(40, 120, 255, 0.32); }
.button-primary:hover { background: #1268f5; }
.button-ghost { border-color: rgba(78, 231, 255, 0.55); background: rgba(5, 20, 48, 0.56); }
.button-outline { border-color: rgba(255, 255, 255, 0.42); background: rgba(7, 16, 33, 0.52); }
.button-outline:hover, .button-ghost:hover { border-color: var(--cyan); background: rgba(16, 46, 91, 0.7); }
.button-small { min-height: 44px; }
.button-large { min-height: 56px; padding: 0 30px; }

.menu-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: rgba(4, 11, 31, 0.7);
  color: var(--white);
  cursor: pointer;
}
.menu-toggle span { font-size: 24px; }

.hero {
  position: relative;
  isolation: isolate;
  min-height: 900px;
  padding: 156px max(34px, calc((100vw - var(--shell)) / 2)) 150px;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: #030a1b;
}
.hero-art {
  position: absolute;
  inset: 0;
  z-index: -4;
  background-image: url("/m78ai-assets/m78-hero-source.png");
  background-size: cover;
  background-position: 58% center;
  filter: saturate(1.08) contrast(1.08);
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -3;
  background: linear-gradient(90deg, rgba(3, 10, 28, 0.99) 0%, rgba(3, 10, 28, 0.96) 37%, rgba(3, 10, 28, 0.7) 57%, rgba(3, 10, 28, 0.17) 76%, rgba(3, 10, 28, 0.36) 100%);
}
.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -2;
  background: linear-gradient(180deg, rgba(3, 9, 27, 0.35), transparent 25%, rgba(3, 9, 27, 0.15) 64%, rgba(3, 9, 27, 0.96));
}
.hero-grid {
  position: absolute;
  inset: 78px 0 0;
  z-index: -1;
  opacity: 0.14;
  background-image: linear-gradient(rgba(255,255,255,0.22) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,0.22) 1px, transparent 1px);
  background-size: 72px 72px;
  mask-image: linear-gradient(90deg, #000, transparent 66%);
}

.hero-content { position: relative; z-index: 2; width: min(710px, 54vw); }
.poster-kicker { margin-bottom: 25px; color: #c7d5ec; font: 700 12px/1.4 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }
.poster-kicker span { color: var(--cyan); }
.poster-kicker b { margin: 0 10px; color: var(--red); }
.hero h1 { margin: 0; font-size: 72px; line-height: 0.96; font-style: italic; font-weight: 950; text-transform: uppercase; text-shadow: 0 10px 45px rgba(4, 11, 31, 0.78); }
.hero-tagline { margin: 24px 0 0; color: #dceaff; font-size: 30px; font-weight: 850; }
.hero-description { max-width: 650px; margin: 19px 0 0; color: #c5d2e6; font-size: 18px; line-height: 1.8; }
.feature-strip { display: flex; flex-wrap: wrap; gap: 12px 24px; margin: 26px 0 0; color: #dce7f8; font-size: 14px; font-weight: 700; }
.feature-strip span { display: inline-flex; align-items: center; gap: 8px; }
.feature-strip b { width: 24px; height: 24px; display: grid; place-items: center; border: 1px solid rgba(78,231,255,0.55); color: var(--cyan); font: 800 10px/1 ui-monospace, monospace; transform: rotate(45deg); }
.feature-strip b::first-letter { transform: rotate(-45deg); }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 34px; }

.signal-panel {
  position: absolute;
  right: max(34px, 3vw);
  top: 315px;
  width: 360px;
  padding: 22px;
  border: 1px solid rgba(107, 182, 255, 0.46);
  border-radius: 8px;
  background: rgba(7, 22, 62, 0.83);
  box-shadow: 0 22px 70px rgba(0, 0, 0, 0.25);
  backdrop-filter: blur(16px);
}
.signal-heading { display: flex; align-items: center; justify-content: space-between; gap: 20px; padding-bottom: 14px; border-bottom: 1px solid var(--line); }
.signal-heading > span { display: flex; align-items: center; gap: 9px; font-weight: 800; }
.signal-heading i { width: 9px; height: 9px; border-radius: 50%; background: var(--cyan); box-shadow: 0 0 16px var(--cyan); }
.signal-heading a { color: #aec2df; font-size: 12px; }
.signal-panel ul { list-style: none; margin: 10px 0 0; padding: 0; }
.signal-panel li { display: flex; align-items: center; justify-content: space-between; gap: 20px; padding: 12px 0; color: #e6eefb; font-size: 13px; }
.signal-panel time { color: #8fa6c8; font: 12px/1 ui-monospace, monospace; }

.hero-metrics {
  position: absolute;
  left: max(34px, calc((100vw - var(--shell)) / 2));
  right: max(34px, calc((100vw - var(--shell)) / 2));
  bottom: 40px;
  z-index: 3;
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  border: 1px solid rgba(124, 188, 255, 0.35);
  border-radius: 8px;
  background: rgba(10, 31, 76, 0.78);
  backdrop-filter: blur(18px);
}
.hero-metrics div { min-height: 80px; display: flex; flex-direction: column; justify-content: center; padding: 14px 26px; border-right: 1px solid var(--line); }
.hero-metrics div:last-child { border-right: 0; }
.hero-metrics strong { color: var(--white); font-size: 17px; }
.hero-metrics span { margin-top: 4px; color: #b9cae3; font-size: 12px; }

.section-shell { width: min(var(--shell), calc(100% - 68px)); margin: 0 auto; }
.section-light { background-color: var(--paper); color: var(--ink); background-image: linear-gradient(rgba(7,16,33,0.055) 1px, transparent 1px), linear-gradient(90deg, rgba(7,16,33,0.055) 1px, transparent 1px); background-size: 54px 54px; }
.capabilities, .models-section { padding: 110px 0; }
.section-heading { margin-bottom: 54px; }
.heading-split { display: grid; grid-template-columns: 1fr minmax(320px, 520px); align-items: end; gap: 60px; }
.section-index { color: #1764d9; font: 800 11px/1.4 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }
.section-heading h2 { margin: 12px 0 0; font-size: 46px; line-height: 1.12; }
.section-heading > p { margin: 0; color: #526077; line-height: 1.8; }
.heading-dark .section-index { color: var(--cyan); }
.heading-dark > p { color: #aebcd2; }

.module-grid { display: grid; grid-template-columns: repeat(4, 1fr); border-top: 2px solid var(--ink); border-bottom: 2px solid var(--ink); }
.module-grid article { min-height: 310px; padding: 28px; border-right: 1px solid rgba(7,16,33,0.2); background: rgba(255,255,255,0.55); }
.module-grid article:last-child { border-right: 0; }
.module-number { display: block; margin-bottom: 54px; color: #1764d9; font: 900 16px/1 ui-monospace, monospace; }
.module-grid small { color: #667187; font: 700 10px/1.5 ui-monospace, monospace; }
.module-grid h3 { margin: 13px 0 10px; font-size: 22px; }
.module-grid p { margin: 0; color: #526077; font-size: 14px; line-height: 1.75; }

.relay-section { padding: 110px 0; background: #10131a; color: var(--white); }
.relay-layout { display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(380px, 0.8fr); gap: 34px; align-items: stretch; }
.code-window { min-width: 0; border: 1px solid rgba(78,231,255,0.28); border-radius: 8px; background: #090e18; overflow: hidden; }
.code-toolbar { min-height: 54px; display: flex; align-items: center; justify-content: space-between; padding: 0 18px; border-bottom: 1px solid rgba(255,255,255,0.1); color: #9fb2cd; font: 700 11px/1 ui-monospace, monospace; }
.code-toolbar button { width: 36px; height: 36px; border: 0; border-radius: 4px; background: #182238; color: var(--cyan); cursor: pointer; font-size: 18px; }
.code-window pre { margin: 0; padding: 35px; overflow-x: auto; }
.code-window code { color: #dbe8fb; font: 14px/1.9 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }
.relay-steps { list-style: none; margin: 0; padding: 0; border-top: 1px solid rgba(255,255,255,0.18); }
.relay-steps li { min-height: 92px; display: grid; grid-template-columns: 50px 1fr; align-items: center; gap: 18px; padding: 18px 12px; border-bottom: 1px solid rgba(255,255,255,0.18); }
.relay-steps > li > span { color: var(--red); font: 900 15px/1 ui-monospace, monospace; }
.relay-steps h3 { margin: 0 0 5px; font-size: 18px; }
.relay-steps p { margin: 0; color: #9fb0c8; font-size: 13px; }

.models-section { color: var(--ink); background: var(--white); }
.text-link { justify-self: end; color: #1764d9; font-weight: 800; }
.model-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.model-card { min-height: 170px; display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 18px; padding: 26px; border: 1px solid #d9e0ea; border-radius: 8px; transition: transform 180ms ease, border-color 180ms ease, box-shadow 180ms ease; }
.model-card:hover { transform: translateY(-4px); border-color: #6da3ff; box-shadow: 0 18px 40px rgba(23, 57, 108, 0.12); }
.model-glyph { width: 54px; height: 54px; display: grid; place-items: center; border-radius: 50%; background: var(--ink); color: var(--white); font-size: 20px; font-weight: 900; }
.model-card h3 { margin: 0; font-size: 18px; }
.model-card p { margin: 7px 0 0; color: #647088; font-size: 12px; }
.model-card b { color: #1764d9; }
.model-claude { border-top: 4px solid var(--red); }
.model-gemini { border-top: 4px solid #2f7ae5; }
.model-media { border-top: 4px solid #00a7a7; }

.final-cta { position: relative; min-height: 330px; display: flex; align-items: center; justify-content: space-between; gap: 50px; padding: 70px max(34px, calc((100vw - var(--shell)) / 2)); overflow: hidden; background: #061124; }
.final-cta > div:not(.cta-orbit) { position: relative; z-index: 2; }
.final-cta span { color: var(--cyan); font: 800 11px/1.4 ui-monospace, monospace; }
.final-cta h2 { max-width: 780px; margin: 16px 0 0; font-size: 45px; }
.cta-actions { display: flex; gap: 12px; flex-shrink: 0; }
.cta-orbit { position: absolute; right: 17%; top: 50%; width: 430px; aspect-ratio: 1; transform: translateY(-50%); border: 1px solid rgba(78,231,255,0.17); border-radius: 50%; box-shadow: 0 0 0 48px rgba(78,231,255,0.03), 0 0 0 96px rgba(232,79,95,0.035); }

footer { min-height: 150px; display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; gap: 30px; padding: 30px max(34px, calc((100vw - var(--shell)) / 2)); border-top: 1px solid rgba(255,255,255,0.1); background: #030814; color: #9aabc3; font-size: 12px; }
.brand-footer .brand-copy strong { color: var(--white); }
footer p { text-align: center; }
footer nav { justify-self: end; display: flex; gap: 24px; }
footer nav a:hover { color: var(--cyan); }

.copy-toast { position: fixed; left: 50%; bottom: 30px; z-index: 50; transform: translate(-50%, 130px); padding: 12px 18px; border-radius: 6px; background: var(--white); color: var(--ink); font-weight: 750; box-shadow: 0 18px 50px rgba(0,0,0,0.28); transition: transform 220ms ease; }
.copy-toast.is-visible { transform: translate(-50%, 0); }

@media (max-width: 1180px) {
  .site-header { grid-template-columns: 1fr auto; }
  .main-nav { position: absolute; top: 78px; left: 0; right: 0; display: none; flex-direction: column; align-items: stretch; gap: 0; padding: 12px 28px 22px; background: rgba(3,9,27,0.97); border-bottom: 1px solid var(--line); }
  .main-nav.is-open { display: flex; }
  .main-nav a { padding: 14px 0; }
  .menu-toggle { display: grid; place-items: center; justify-self: end; }
  .header-actions { display: none; }
  .signal-panel { display: none; }
  .hero-content { width: min(720px, 68vw); }
  .module-grid { grid-template-columns: repeat(2, 1fr); }
  .module-grid article:nth-child(2) { border-right: 0; }
  .module-grid article:nth-child(-n+2) { border-bottom: 1px solid rgba(7,16,33,0.2); }
  .model-grid { grid-template-columns: repeat(2, 1fr); }
  .final-cta { align-items: flex-start; flex-direction: column; }
  footer { grid-template-columns: 1fr 1fr; }
  footer p { order: 3; grid-column: 1 / -1; text-align: left; }
}

@media (max-width: 760px) {
  .site-header { min-height: 70px; padding: 12px 18px; }
  .brand-copy { align-items: flex-start; flex-direction: column; gap: 2px; }
  .brand-copy strong { font-size: 24px; }
  .brand-mark { width: 34px; height: 34px; }
  .main-nav { top: 70px; }
  .hero { min-height: 890px; align-items: flex-start; padding: 132px 22px 260px; }
  .hero-art { background-position: 67% center; }
  .hero::before { background: linear-gradient(180deg, rgba(3,10,28,0.98) 0%, rgba(3,10,28,0.88) 45%, rgba(3,10,28,0.36) 68%, rgba(3,10,28,0.95) 100%); }
  .hero::after { background: linear-gradient(180deg, rgba(3,9,27,0.3), transparent 38%, rgba(3,9,27,0.82) 66%, rgba(3,9,27,1)); }
  .hero-grid { inset: 70px 0 0; background-size: 46px 46px; mask-image: linear-gradient(180deg, #000, transparent 75%); }
  .hero-content { width: 100%; }
  .poster-kicker { max-width: 300px; }
  .hero h1 { font-size: 46px; }
  .hero-tagline { font-size: 23px; }
  .hero-description { font-size: 16px; line-height: 1.7; }
  .feature-strip { gap: 12px 16px; }
  .hero-actions { display: grid; grid-template-columns: 1fr; }
  .hero-actions .button { width: 100%; }
  .hero-metrics { left: 18px; right: 18px; bottom: 22px; grid-template-columns: repeat(2, 1fr); }
  .hero-metrics div { min-height: 62px; padding: 10px 14px; border-bottom: 1px solid var(--line); }
  .hero-metrics div:nth-child(2n) { border-right: 0; }
  .hero-metrics div:last-child { grid-column: 1 / -1; border-bottom: 0; }
  .hero-metrics strong { font-size: 14px; }
  .section-shell { width: min(100% - 36px, var(--shell)); }
  .capabilities, .models-section, .relay-section { padding: 78px 0; }
  .heading-split { grid-template-columns: 1fr; gap: 20px; }
  .section-heading { margin-bottom: 36px; }
  .section-heading h2 { font-size: 34px; }
  .module-grid, .model-grid, .relay-layout { grid-template-columns: 1fr; }
  .module-grid article { min-height: auto; border-right: 0; border-bottom: 1px solid rgba(7,16,33,0.2); }
  .module-grid article:last-child { border-bottom: 0; }
  .module-number { margin-bottom: 30px; }
  .relay-layout { gap: 26px; }
  .code-window pre { padding: 22px; }
  .code-window code { font-size: 12px; }
  .model-grid { gap: 10px; }
  .model-card { min-height: 136px; }
  .text-link { justify-self: start; }
  .final-cta { min-height: 410px; padding: 64px 22px; }
  .final-cta h2 { font-size: 34px; }
  .cta-actions { width: 100%; display: grid; grid-template-columns: 1fr; }
  footer { grid-template-columns: 1fr; padding: 42px 22px; }
  footer nav { justify-self: start; flex-wrap: wrap; }
  footer p { grid-column: auto; order: initial; text-align: left; }
}

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