@import url("https://fonts.googleapis.com/css2?family=Manrope:wght@400;500;600;700;800&family=Space+Grotesk:wght@400;500;700&display=swap");

:root {
  --bg: #010402;
  --bg-soft: #061109;
  --bg-deep: #000000;
  --surface: rgba(12, 18, 12, 0.74);
  --surface-strong: rgba(9, 14, 10, 0.9);
  --surface-soft: rgba(18, 24, 18, 0.6);
  --text: #f7fbf4;
  --muted: #9ba79c;
  --line: rgba(255, 255, 255, 0.09);
  --line-strong: rgba(55, 207, 134, 0.34);
  --primary: #37cf86;
  --primary-strong: #72f2a7;
  --secondary: #d5ff63;
  --accent: #efffd8;
  --shadow: 0 28px 80px rgba(0, 0, 0, 0.5);
  --radius-xl: 34px;
  --radius-lg: 26px;
  --radius-md: 18px;
  --radius-sm: 14px;
  --container: 1200px;
  --header-height: 112px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  font-family: "Manrope", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background:
    radial-gradient(circle at 20% 12%, rgba(55, 207, 134, 0.12), transparent 26%),
    radial-gradient(circle at 82% 18%, rgba(213, 255, 99, 0.08), transparent 22%),
    radial-gradient(circle at 50% 120%, rgba(55, 207, 134, 0.08), transparent 36%),
    linear-gradient(180deg, #010402 0%, #030906 36%, #020302 100%);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

body::before,
body::after {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
}

body::before {
  background-image:
    linear-gradient(to right, rgba(255, 255, 255, 0.028) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255, 255, 255, 0.028) 1px, transparent 1px);
  background-size: 40px 40px;
  mask-image: radial-gradient(circle at center, black 38%, transparent 92%);
  opacity: 0.7;
}

body::after {
  inset: -10%;
  background-image:
    radial-gradient(circle at 12% 28%, rgba(213, 255, 99, 0.88) 0 1px, transparent 1.5px),
    radial-gradient(circle at 72% 18%, rgba(55, 207, 134, 0.8) 0 1.2px, transparent 1.8px),
    radial-gradient(circle at 32% 72%, rgba(255, 255, 255, 0.5) 0 1px, transparent 1.6px),
    radial-gradient(circle at 86% 68%, rgba(55, 207, 134, 0.65) 0 1.4px, transparent 1.9px);
  background-size: 280px 280px, 360px 360px, 240px 240px, 320px 320px;
  opacity: 0.18;
  animation: starDrift 80s linear infinite;
}

body.page-home::before {
  opacity: 0.92;
}

body.page-home::after {
  opacity: 0.34;
}

::selection {
  color: #021108;
  background: var(--primary);
}

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

button,
input,
textarea {
  font: inherit;
}

img {
  display: block;
  max-width: 100%;
}

.page-main {
  position: relative;
  z-index: 2;
  padding: calc(var(--header-height) + 4px) 0 92px;
}

.container {
  width: min(calc(100% - 40px), var(--container));
  margin: 0 auto;
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 60;
  padding-top: 20px;
}

.nav-shell {
  position: relative;
  display: flex;
  align-items: center;
  gap: 16px;
  min-height: 72px;
  padding: 12px 22px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 999px;
  background: rgba(0, 0, 0, 0.58);
  backdrop-filter: blur(20px);
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.48);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-family: "Space Grotesk", "Manrope", sans-serif;
  font-weight: 700;
  letter-spacing: 0.04em;
  white-space: nowrap;
}

.brand-mark {
  width: 16px;
  height: 16px;
  border-radius: 6px;
  background:
    radial-gradient(circle at 35% 35%, rgba(255, 255, 255, 0.88), transparent 34%),
    linear-gradient(135deg, var(--primary), var(--secondary));
  box-shadow:
    0 0 20px rgba(55, 207, 134, 0.5),
    0 0 40px rgba(213, 255, 99, 0.12);
}

.site-menu {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-left: auto;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 0 14px;
  border-radius: 999px;
  color: var(--muted);
  font-size: 0.95rem;
  transition:
    color 180ms ease,
    background-color 180ms ease,
    border-color 180ms ease;
}

.nav-link:hover,
.nav-link.is-active {
  color: var(--text);
  background: rgba(55, 207, 134, 0.1);
  border-color: rgba(55, 207, 134, 0.18);
}

.nav-button {
  margin-left: 14px;
  flex-shrink: 0;
}

.menu-toggle {
  display: none;
  margin-left: auto;
  padding: 10px 16px;
  border-radius: 999px;
  border: 1px solid rgba(55, 207, 134, 0.2);
  background: rgba(0, 0, 0, 0.68);
  color: var(--text);
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 50px;
  padding: 0 18px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-weight: 700;
  letter-spacing: 0.01em;
  transition:
    transform 180ms ease,
    background-color 180ms ease,
    border-color 180ms ease,
    color 180ms ease,
    box-shadow 180ms ease;
}

.button:hover {
  transform: translateY(-1px);
}

.button.primary {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: #031108;
  box-shadow: 0 18px 44px rgba(55, 207, 134, 0.28);
}

.button.secondary {
  border-color: rgba(55, 207, 134, 0.22);
  background: rgba(9, 14, 10, 0.72);
  color: var(--text);
}

.button.ghost {
  color: var(--muted);
}

.button.small {
  min-height: 40px;
  padding: 0 14px;
  font-size: 0.94rem;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--primary);
  font-size: 0.8rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
}

h1,
h2,
h3,
h4,
p {
  margin-top: 0;
}

.display-title,
.page-title,
.section-title {
  font-family: "Space Grotesk", "Manrope", sans-serif;
}

.display-title {
  margin-bottom: 18px;
  font-size: clamp(3.8rem, 8vw, 7rem);
  line-height: 0.92;
  letter-spacing: -0.08em;
}

.page-title {
  margin-bottom: 16px;
  font-size: clamp(2.8rem, 5vw, 4.6rem);
  line-height: 0.98;
  letter-spacing: -0.05em;
}

.section {
  padding: 40px 0;
}

.section-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 24px;
}

.section-title {
  margin-bottom: 0;
  font-size: clamp(1.9rem, 3vw, 2.8rem);
  letter-spacing: -0.04em;
}

.section-intro {
  margin: 0;
  max-width: 64ch;
  color: var(--muted);
  line-height: 1.85;
}

.lead {
  max-width: 62ch;
  margin-bottom: 0;
  color: var(--muted);
  font-size: 1.06rem;
  line-height: 1.9;
}

.panel,
.info-card,
.stat-card,
.timeline-item,
.quick-link,
.contact-card,
.project-card,
.detail-card,
.hero-copy,
.hero-visual,
.accent-panel,
.message,
.chat-panel,
.lab-panel {
  background:
    linear-gradient(180deg, rgba(17, 24, 16, 0.82), rgba(8, 12, 8, 0.76)),
    rgba(10, 15, 10, 0.76);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  backdrop-filter: blur(14px);
}

.panel,
.accent-panel {
  padding: 30px;
  border-radius: var(--radius-xl);
}

.accent-panel {
  border-color: var(--line-strong);
  background:
    radial-gradient(circle at top right, rgba(55, 207, 134, 0.13), transparent 32%),
    linear-gradient(180deg, rgba(16, 24, 15, 0.9), rgba(8, 12, 8, 0.82));
}

.panel:hover,
.info-card:hover,
.quick-link:hover,
.project-card:hover,
.contact-card:hover,
.detail-card:hover,
.lab-panel:hover {
  border-color: rgba(55, 207, 134, 0.26);
  box-shadow:
    var(--shadow),
    0 0 0 1px rgba(55, 207, 134, 0.12);
}

.hero-grid,
.two-column {
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(340px, 0.92fr);
  gap: 26px;
  align-items: stretch;
}

.hero-copy,
.hero-visual {
  border-radius: var(--radius-xl);
  padding: 36px;
}

.hero-actions,
.button-row,
.status-list,
.tag-list,
.meta-list {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.status-pill,
.tag,
.metric-chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 38px;
  padding: 0 14px;
  border-radius: 999px;
  color: var(--text);
  background: rgba(55, 207, 134, 0.08);
  border: 1px solid rgba(55, 207, 134, 0.14);
}

.status-pill::before,
.metric-chip::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 999px;
  background: var(--secondary);
  box-shadow: 0 0 12px rgba(213, 255, 99, 0.72);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.info-card,
.project-card,
.quick-link,
.contact-card,
.detail-card,
.lab-panel {
  border-radius: var(--radius-lg);
  padding: 24px;
}

.info-card h3,
.project-card h3,
.quick-link h3,
.contact-card h3,
.detail-card h3,
.lab-panel h3 {
  margin-bottom: 10px;
  font-size: 1.16rem;
}

.muted {
  color: var(--muted);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.stat-card {
  border-radius: var(--radius-md);
  padding: 20px;
}

.stat-label {
  display: block;
  margin-bottom: 10px;
  color: var(--muted);
  font-size: 0.82rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.stat-value {
  font-family: "Space Grotesk", "Manrope", sans-serif;
  font-size: 1.55rem;
  font-weight: 700;
  letter-spacing: -0.04em;
}

.timeline {
  display: grid;
  gap: 18px;
}

.timeline-item {
  display: grid;
  grid-template-columns: minmax(160px, 220px) minmax(0, 1fr);
  gap: 20px;
  padding: 26px;
  border-radius: var(--radius-lg);
}

.timeline-meta span {
  display: inline-flex;
  padding: 8px 12px;
  border-radius: 999px;
  color: var(--primary);
  background: rgba(55, 207, 134, 0.08);
}

.timeline-meta strong {
  display: block;
  margin-top: 14px;
  font-size: 1.14rem;
}

.bullet-list {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.bullet-list li {
  position: relative;
  padding-left: 18px;
  color: var(--muted);
  line-height: 1.8;
}

.bullet-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.8em;
  width: 7px;
  height: 7px;
  border-radius: 999px;
  background: var(--primary);
  box-shadow: 0 0 10px rgba(55, 207, 134, 0.54);
}

.quick-links {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 16px;
}

.quick-link {
  display: block;
  min-height: 190px;
}

.quick-link small {
  display: block;
  margin-top: 10px;
  color: var(--muted);
  line-height: 1.7;
}

.contact-list {
  display: grid;
  gap: 14px;
}

.contact-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 16px 18px;
  border-radius: var(--radius-md);
  background: rgba(6, 10, 6, 0.66);
  border: 1px solid var(--line);
}

.contact-row strong {
  display: block;
  font-size: 0.95rem;
}

.contact-row span {
  color: var(--muted);
  word-break: break-all;
}

.site-footer {
  position: relative;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  background:
    radial-gradient(circle at 50% 100%, rgba(55, 207, 134, 0.08), transparent 30%),
    #010301;
}

.site-footer::before {
  content: "VEX AI";
  position: absolute;
  left: 50%;
  bottom: 12px;
  transform: translateX(-50%);
  color: transparent;
  font-family: "Space Grotesk", "Manrope", sans-serif;
  font-size: clamp(4rem, 12vw, 10rem);
  font-weight: 700;
  letter-spacing: -0.08em;
  -webkit-text-stroke: 1px rgba(255, 255, 255, 0.04);
  pointer-events: none;
}

.footer-shell {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  min-height: 96px;
}

.footer-note {
  color: var(--muted);
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  color: var(--muted);
}

.footer-links a:hover {
  color: var(--text);
}

.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition:
    opacity 600ms ease,
    transform 600ms ease;
}

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

@keyframes starDrift {
  from {
    transform: translateY(0);
  }

  to {
    transform: translateY(-180px);
  }
}

@media (max-width: 1080px) {
  .card-grid,
  .stats-grid,
  .quick-links {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .hero-grid,
  .two-column {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 860px) {
  .site-header {
    padding-top: 14px;
  }

  .nav-shell {
    min-height: 64px;
    padding: 10px 18px;
  }

  .menu-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .nav-button {
    display: none;
  }

  .site-menu {
    position: absolute;
    left: 0;
    right: 0;
    top: calc(100% + 12px);
    display: none;
    flex-direction: column;
    align-items: stretch;
    padding: 14px;
    border-radius: 26px;
    background: rgba(0, 0, 0, 0.92);
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
  }

  .site-menu.is-open {
    display: flex;
  }

  .nav-link {
    width: 100%;
    padding: 12px 14px;
  }

  .timeline-item {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .container {
    width: min(calc(100% - 28px), var(--container));
  }

  .page-main {
    padding-top: calc(var(--header-height) - 8px);
  }

  .hero-copy,
  .hero-visual,
  .panel,
  .accent-panel,
  .info-card,
  .project-card,
  .quick-link,
  .contact-card,
  .detail-card,
  .lab-panel {
    padding: 20px;
  }

  .card-grid,
  .stats-grid,
  .quick-links {
    grid-template-columns: 1fr;
  }

  .footer-shell {
    flex-direction: column;
    align-items: flex-start;
    padding: 22px 0;
  }

  .site-footer::before {
    bottom: 58px;
  }
}