/* Kyntix AR — 企业官网 */
:root {
  --bg: #080b10;
  --surface: #161d28;
  --border: rgba(255, 255, 255, 0.08);
  --text: #e8ecf2;
  --text-muted: #94a3b8;
  --accent: #3b82f6;
  --accent-2: #22d3ee;
  --accent-soft: rgba(59, 130, 246, 0.15);
  --glow-blue: rgba(59, 130, 246, 0.45);
  --glow-cyan: rgba(34, 211, 238, 0.2);
  --glow-violet: rgba(139, 92, 246, 0.18);
  --radius: 12px;
  --radius-lg: 20px;
  --header-h: 72px;
  --max: 1180px;
  --font-sans: "Noto Sans SC", "DM Sans", system-ui, sans-serif;
  --transition: 0.25s ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text);
  background-color: var(--bg);
  -webkit-font-smoothing: antialiased;
}

/* 全局科技感氛围：极光光晕 + 透视网格 + 噪点 + 微弱扫描线 */
.page-atmosphere {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
  background: radial-gradient(ellipse 120% 80% at 50% -30%, rgba(30, 58, 120, 0.35) 0%, transparent 55%),
    radial-gradient(ellipse 90% 60% at 100% 0%, rgba(59, 130, 246, 0.08) 0%, transparent 50%),
    linear-gradient(165deg, #06080c 0%, #0a0e16 35%, #080a0f 70%, #050608 100%);
}

.page-atmosphere__glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.55;
  animation: atmosphere-drift 22s ease-in-out infinite;
}

.page-atmosphere__glow--a {
  width: min(90vw, 720px);
  height: min(90vw, 720px);
  top: -12%;
  left: -8%;
  background: radial-gradient(circle, var(--glow-blue) 0%, transparent 68%);
  animation-delay: 0s;
}

.page-atmosphere__glow--b {
  width: min(70vw, 520px);
  height: min(70vw, 520px);
  bottom: 5%;
  right: -10%;
  background: radial-gradient(circle, var(--glow-violet) 0%, transparent 65%);
  animation-delay: -7s;
  animation-duration: 26s;
}

.page-atmosphere__glow--c {
  width: min(55vw, 420px);
  height: min(55vw, 420px);
  top: 42%;
  left: 35%;
  background: radial-gradient(circle, var(--glow-cyan) 0%, transparent 70%);
  opacity: 0.35;
  animation-delay: -12s;
  animation-duration: 19s;
}

@keyframes atmosphere-drift {
  0%,
  100% {
    transform: translate(0, 0) scale(1);
    opacity: 0.45;
  }

  33% {
    transform: translate(3%, 4%) scale(1.06);
    opacity: 0.6;
  }

  66% {
    transform: translate(-2%, 2%) scale(0.96);
    opacity: 0.5;
  }
}

.page-atmosphere__grid {
  position: absolute;
  inset: -1px;
  background-image: linear-gradient(rgba(59, 130, 246, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(59, 130, 246, 0.045) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.2) 0%, rgba(0, 0, 0, 0.85) 25%, rgba(0, 0, 0, 0.75) 75%, rgba(0, 0, 0, 0.15) 100%),
    radial-gradient(ellipse 85% 70% at 50% 40%, black 20%, transparent 72%);
  mask-composite: intersect;
  -webkit-mask-composite: source-in;
}

@supports not (mask-composite: intersect) {
  .page-atmosphere__grid {
    mask-image: linear-gradient(180deg, transparent 0%, black 18%, black 82%, transparent 100%);
  }
}

.page-atmosphere__noise {
  position: absolute;
  inset: 0;
  opacity: 0.04;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  mix-blend-mode: overlay;
}

.page-atmosphere__scan {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    transparent 0%,
    transparent 48%,
    rgba(34, 211, 238, 0.03) 49.5%,
    rgba(59, 130, 246, 0.04) 50%,
    rgba(34, 211, 238, 0.03) 50.5%,
    transparent 52%,
    transparent 100%
  );
  background-size: 100% 220%;
  animation: atmosphere-scan 14s linear infinite;
  opacity: 0.65;
}

@keyframes atmosphere-scan {
  0% {
    background-position: 0% 0%;
  }

  100% {
    background-position: 0% 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-atmosphere__glow,
  .page-atmosphere__scan {
    animation: none;
  }

  .page-atmosphere__glow {
    opacity: 0.4;
  }

  .page-atmosphere__scan {
    opacity: 0.25;
    background-position: 0% 40%;
  }
}

.site-main,
.site-footer {
  position: relative;
  z-index: 1;
}

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

a {
  color: var(--accent);
  text-decoration: none;
  transition: opacity var(--transition);
}

a:hover {
  opacity: 0.88;
}

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

/* Header */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--header-h);
  background: rgba(8, 11, 16, 0.72);
  backdrop-filter: blur(16px) saturate(1.2);
  border-bottom: 1px solid rgba(59, 130, 246, 0.12);
  box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.03) inset, 0 12px 40px -20px rgba(0, 0, 0, 0.6);
}

.site-header.is-scrolled {
  background: rgba(8, 11, 16, 0.88);
  border-bottom-color: rgba(59, 130, 246, 0.18);
}

.header-inner {
  width: min(100% - 32px, var(--max));
  height: 100%;
  margin-inline: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.logo {
  display: inline-flex;
  align-items: baseline;
  gap: 0.35rem;
  color: var(--text);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.logo-mark {
  font-size: 1.35rem;
}

.logo-sub {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

.site-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1.5rem;
  align-items: center;
}

.site-nav a {
  color: var(--text-muted);
  font-size: 0.9375rem;
  font-weight: 500;
}

.site-nav a:hover {
  color: var(--text);
  opacity: 1;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  width: 44px;
  height: 44px;
  padding: 0;
  border: none;
  background: transparent;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  height: 2px;
  width: 22px;
  background: var(--text);
  margin-inline: auto;
  transition: transform var(--transition), opacity var(--transition);
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

/* Hero */
.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  align-items: center;
  padding: calc(var(--header-h) + 3rem) 0 4rem;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background-image: url("../assets/images/hero_glasses.png");
  background-size: cover;
  background-position: center 30%;
}

.hero-bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    105deg,
    rgba(12, 15, 20, 0.92) 0%,
    rgba(12, 15, 20, 0.75) 45%,
    rgba(12, 15, 20, 0.35) 100%
  );
}

.hero-content {
  position: relative;
  z-index: 1;
  width: min(100% - 40px, var(--max));
  margin-inline: auto;
  max-width: 640px;
}

.eyebrow {
  margin: 0 0 0.75rem;
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
}

.hero h1 {
  margin: 0 0 1.25rem;
  font-size: clamp(2rem, 5vw, 3.25rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
}

.hero .accent {
  color: var(--accent);
}

.lead {
  margin: 0 0 2rem;
  font-size: 1.0625rem;
  color: var(--text-muted);
  max-width: 36em;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  font-family: inherit;
  font-size: 0.9375rem;
  font-weight: 600;
  border-radius: 999px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background var(--transition), border-color var(--transition), color var(--transition);
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}

.btn-primary:hover {
  opacity: 0.95;
}

.btn-ghost {
  background: transparent;
  color: var(--text);
  border-color: var(--border);
}

.btn-ghost:hover {
  border-color: rgba(255, 255, 255, 0.25);
  background: rgba(255, 255, 255, 0.04);
}

.btn-block {
  width: 100%;
}

/* Sections */
.section {
  padding: 5rem 0;
}

.section-muted {
  background: linear-gradient(180deg, rgba(14, 19, 28, 0.55) 0%, rgba(10, 14, 22, 0.4) 100%);
  backdrop-filter: blur(8px);
  border-block: 1px solid rgba(59, 130, 246, 0.06);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.02) inset;
}

.section-title {
  margin: 0 0 1rem;
  font-size: clamp(1.75rem, 3vw, 2.25rem);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.section-lead {
  margin: 0;
  color: var(--text-muted);
  max-width: 42em;
}

.section-head {
  margin-bottom: 2.5rem;
  text-align: center;
}

.section-head .section-title {
  margin-bottom: 0.75rem;
}

.section-head .section-lead {
  margin-inline: auto;
}

.grid-2 {
  display: grid;
  gap: 3rem;
  align-items: center;
}

@media (min-width: 900px) {
  .grid-2 {
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
  }
}

.about-visual {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border);
  background: var(--surface);
}

.about-visual img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.checklist {
  margin: 1.5rem 0 0;
  padding: 0;
  list-style: none;
}

.checklist li {
  position: relative;
  padding-left: 1.5rem;
  margin-bottom: 0.75rem;
  color: var(--text-muted);
}

.checklist li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
}

/* Cards */
.card-grid {
  display: grid;
  gap: 1.5rem;
}

.card-grid-2 {
  grid-template-columns: 1fr;
}

@media (min-width: 700px) {
  .card-grid-2 {
    grid-template-columns: repeat(2, 1fr);
  }
}

.card-grid-3 {
  grid-template-columns: 1fr;
}

@media (min-width: 768px) {
  .card-grid-3 {
    grid-template-columns: repeat(3, 1fr);
  }
}

.card-grid-4 {
  grid-template-columns: 1fr;
}

@media (min-width: 600px) {
  .card-grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1000px) {
  .card-grid-4 {
    grid-template-columns: repeat(4, 1fr);
  }
}

.card {
  background: linear-gradient(145deg, rgba(24, 32, 44, 0.95) 0%, rgba(18, 24, 34, 0.98) 100%);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 0 0 1px rgba(59, 130, 246, 0.04) inset, 0 20px 50px -35px rgba(0, 0, 0, 0.55);
  transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
}

.card:hover {
  border-color: rgba(59, 130, 246, 0.35);
  box-shadow: 0 0 0 1px rgba(59, 130, 246, 0.08) inset, 0 24px 60px -30px rgba(59, 130, 246, 0.12);
}

.card-grid-4 .card:hover {
  transform: translateY(-2px);
}

.card-media {
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: #0a0d12;
}

.card-media.tall {
  aspect-ratio: 5 / 6;
}

.card-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.card h3,
.card p {
  margin: 0;
}

.card > h3,
.card > p,
.card > time {
  padding: 0 1.25rem;
}

.card > h3 {
  margin-top: 1rem;
  font-size: 1.125rem;
}

.card > p {
  margin-top: 0.5rem;
  margin-bottom: 1.25rem;
  font-size: 0.9375rem;
  color: var(--text-muted);
}

.product-showcase {
  margin: 0;
  padding: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border);
  background: var(--surface);
  max-width: 1000px;
  margin-inline: auto;
}

.product-showcase img {
  width: 100%;
  height: auto;
}

.card-news time {
  display: block;
  margin-top: 1rem;
  font-size: 0.8125rem;
  color: var(--accent);
  font-weight: 600;
}

.card-news h3 {
  margin-top: 0.35rem;
}

/* Contact */
.section-contact {
  border-top: 1px solid var(--border);
}

.contact-grid {
  display: grid;
  gap: 3rem;
}

@media (min-width: 900px) {
  .contact-grid {
    grid-template-columns: 1fr 1fr;
    align-items: start;
  }
}

.contact-list {
  margin: 2rem 0 0;
}

.contact-list > div {
  margin-bottom: 1.25rem;
}

.contact-list dt {
  margin: 0 0 0.25rem;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
}

.contact-list dd {
  margin: 0;
  color: var(--text);
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  padding: 1.75rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
}

.contact-form label span {
  display: block;
  margin-bottom: 0.35rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-muted);
}

.contact-form input,
.contact-form select,
.contact-form textarea {
  width: 100%;
  padding: 0.65rem 0.85rem;
  font-family: inherit;
  font-size: 1rem;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  transition: border-color var(--transition);
}

.contact-form input:focus,
.contact-form select:focus,
.contact-form textarea:focus {
  outline: none;
  border-color: var(--accent);
}

.contact-form textarea {
  resize: vertical;
  min-height: 120px;
}

.form-note {
  margin: 0;
  min-height: 1.25em;
  font-size: 0.875rem;
  color: var(--accent);
}

/* Footer */
.site-footer {
  padding: 3rem 0;
  border-top: 1px solid rgba(59, 130, 246, 0.1);
  background: linear-gradient(180deg, rgba(10, 14, 22, 0.92) 0%, rgba(6, 8, 12, 0.98) 100%);
  box-shadow: 0 0 80px -30px rgba(59, 130, 246, 0.08) inset;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  text-align: center;
}

@media (min-width: 768px) {
  .footer-inner {
    flex-direction: row;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    text-align: left;
  }
}

.footer-brand p {
  margin: 0.5rem 0 0;
  font-size: 0.875rem;
  color: var(--text-muted);
  max-width: 280px;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 1.5rem;
  justify-content: center;
}

@media (min-width: 768px) {
  .footer-links {
    justify-content: flex-end;
  }
}

.footer-links a {
  color: var(--text-muted);
  font-size: 0.9375rem;
}

.footer-links a:hover {
  color: var(--text);
  opacity: 1;
}

.copyright {
  width: 100%;
  margin: 0;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
  font-size: 0.8125rem;
  color: var(--text-muted);
}

@media (min-width: 768px) {
  .copyright {
    order: 3;
    text-align: center;
    border-top: none;
    padding-top: 0;
  }
}

/* Mobile nav */
@media (max-width: 899px) {
  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(12, 15, 20, 0.98);
    padding: 1.5rem;
    transform: translateX(100%);
    transition: transform var(--transition);
    visibility: hidden;
  }

  .site-nav.is-open {
    transform: translateX(0);
    visibility: visible;
  }

  .site-nav ul {
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
  }

  .site-nav a {
    display: block;
    padding: 0.85rem 0;
    font-size: 1.125rem;
    border-bottom: 1px solid var(--border);
    width: 100%;
  }
}

body.nav-open {
  overflow: hidden;
}