/* =================================================================
   BACKGROUND FIELD
================================================================= */
.bg-field {
  position: fixed;
  inset: 0;
  z-index: var(--z-bg);
  overflow: hidden;
  pointer-events: none;
  background:
    radial-gradient(ellipse 60% 40% at 50% 0%, rgba(0, 212, 255, 0.14), transparent 60%),
    radial-gradient(ellipse 40% 50% at 90% 100%, rgba(124, 58, 237, 0.15), transparent 60%),
    radial-gradient(ellipse 50% 40% at 10% 80%, rgba(34, 211, 238, 0.08), transparent 60%),
    linear-gradient(180deg, #05070d 0%, #070a14 40%, #05070d 100%);
}

.bg-grid {
  position: absolute;
  inset: -50%;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.035) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 40%, #000 30%, transparent 85%);
  -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 40%, #000 30%, transparent 85%);
  transform: perspective(900px) rotateX(55deg) translateY(10vh);
  transform-origin: center top;
  opacity: 0.7;
}

.bg-glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.6;
  animation: floatGlow 20s var(--ease-out) infinite alternate;
}
.bg-glow--a { width: 520px; height: 520px; top: -200px; left: -120px; background: radial-gradient(circle, #00d4ff 0%, transparent 70%); }
.bg-glow--b { width: 620px; height: 620px; top: 40%; right: -220px; background: radial-gradient(circle, #7c3aed 0%, transparent 70%); animation-delay: -6s; }
.bg-glow--c { width: 480px; height: 480px; bottom: -180px; left: 30%; background: radial-gradient(circle, #22d3ee 0%, transparent 70%); animation-delay: -12s; }

@keyframes floatGlow {
  0%   { transform: translate(0, 0) scale(1); }
  50%  { transform: translate(40px, -30px) scale(1.1); }
  100% { transform: translate(-30px, 30px) scale(0.95); }
}

#particles {
  display: none;
}

.bg-lasers,
.bg-scan {
  display: none;
}

.bg-noise {
  position: absolute;
  inset: 0;
  opacity: 0.035;
  mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* ---- High-tech laser beams ------------------------------------------------ */
.bg-lasers {
  position: absolute;
  inset: 0;
  overflow: hidden;
  mix-blend-mode: screen;
}
.laser {
  position: absolute;
  pointer-events: none;
  opacity: 0.55;
}
/* diagonal sweeping beams */
.laser--1, .laser--2, .laser--3 {
  top: -20%;
  height: 140%;
  width: 2px;
  background: linear-gradient(180deg, transparent, rgba(0, 212, 255, 0.9), transparent);
  filter: blur(0.5px) drop-shadow(0 0 8px rgba(0, 212, 255, 0.7));
  transform: rotate(18deg);
  animation: laserSweep 11s var(--ease-out) infinite;
}
.laser--1 { left: 12%; animation-delay: 0s; }
.laser--2 { left: 46%; background: linear-gradient(180deg, transparent, rgba(124, 58, 237, 0.9), transparent); filter: blur(0.5px) drop-shadow(0 0 8px rgba(124, 58, 237, 0.7)); animation-delay: -4s; animation-duration: 14s; }
.laser--3 { left: 78%; background: linear-gradient(180deg, transparent, rgba(34, 211, 238, 0.85), transparent); animation-delay: -8s; animation-duration: 16s; }

@keyframes laserSweep {
  0%   { transform: translateX(-30vw) rotate(18deg); opacity: 0; }
  15%  { opacity: 0.6; }
  50%  { opacity: 0.5; }
  85%  { opacity: 0.5; }
  100% { transform: translateX(40vw) rotate(18deg); opacity: 0; }
}

/* horizontal scan beams */
.laser--v1, .laser--v2 {
  left: -10%;
  width: 120%;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(0, 212, 255, 0.7), rgba(124, 58, 237, 0.7), transparent);
  filter: drop-shadow(0 0 6px rgba(0, 212, 255, 0.5));
  animation: laserScanV 18s linear infinite;
}
.laser--v1 { top: 28%; animation-delay: 0s; }
.laser--v2 { top: 66%; animation-delay: -9s; animation-duration: 22s; }

@keyframes laserScanV {
  0%   { transform: translateY(-30vh); opacity: 0; }
  10%  { opacity: 0.5; }
  90%  { opacity: 0.5; }
  100% { transform: translateY(60vh); opacity: 0; }
}

/* slow radar scan sweep over the whole field */
.bg-scan {
  position: absolute;
  inset: -25%;
  background: conic-gradient(from 0deg at 50% 50%, transparent 0deg, rgba(0, 212, 255, 0.06) 18deg, transparent 40deg);
  animation: radarSpin 24s linear infinite;
  mix-blend-mode: screen;
  opacity: 0.7;
}
@keyframes radarSpin {
  from { transform: rotate(0deg); }
  to   { transform: rotate(360deg); }
}

/* HUD corner brackets */
.hud {
  position: absolute;
  width: 64px;
  height: 64px;
  border: 1px solid rgba(0, 212, 255, 0.28);
  opacity: 0.6;
}
.hud--tl { top: 18px; left: 18px; border-right: 0; border-bottom: 0; }
.hud--tr { top: 18px; right: 18px; border-left: 0; border-bottom: 0; }
.hud--bl { bottom: 18px; left: 18px; border-right: 0; border-top: 0; }
.hud--br { bottom: 18px; right: 18px; border-left: 0; border-top: 0; }
@media (max-width: 640px) { .hud { width: 36px; height: 36px; } }

/* =================================================================
   TYPOGRAPHY HELPERS
================================================================= */
h1, h2, h3, h4, h5 {
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: -0.02em;
  margin: 0;
  color: var(--text);
}

.grad-text {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.55em;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-dim);
  padding: 6px 12px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  backdrop-filter: blur(10px);
}

.eyebrow__pulse {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 0 rgba(0, 212, 255, 0.6);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%   { box-shadow: 0 0 0 0 rgba(0, 212, 255, 0.6); }
  70%  { box-shadow: 0 0 0 8px rgba(0, 212, 255, 0); }
  100% { box-shadow: 0 0 0 0 rgba(0, 212, 255, 0); }
}

.eyebrow--line {
  border: 0;
  background: transparent;
  padding: 0;
  color: var(--accent);
  backdrop-filter: none;
}

/* =================================================================
   LAYOUT
================================================================= */
main {
  max-width: 1320px;
  margin: 0 auto;
  padding: 0 clamp(1rem, 3vw, 2.5rem);
}

.section {
  padding-top: var(--section-y);
  padding-bottom: 0;
  position: relative;
}

.section__head {
  max-width: 820px;
  margin: 0 auto 3.5rem;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 18px;
}

.section__head--split {
  flex-direction: row;
  max-width: none;
  text-align: left;
  align-items: flex-end;
  justify-content: space-between;
  gap: 2rem;
  flex-wrap: wrap;
}
.section__head--split > div {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.section__title {
  font-size: clamp(2rem, 4.2vw, 3.6rem);
  line-height: 1.05;
  letter-spacing: -0.03em;
  font-weight: 600;
}

.section__sub {
  color: var(--text-dim);
  font-size: clamp(1rem, 1.15vw, 1.1rem);
  max-width: 60ch;
}
.section__sub--right {
  text-align: right;
  max-width: 42ch;
}

/* =================================================================
   FOOTER
================================================================= */
.footer {
  margin-top: clamp(4rem, 8vw, 6rem);
  border-top: 1px solid var(--border);
  background: linear-gradient(180deg, transparent, rgba(5, 7, 13, 0.5));
}

.footer__top {
  max-width: 1320px;
  margin: 0 auto;
  padding: clamp(2.5rem, 5vw, 4rem) clamp(1rem, 3vw, 2.5rem) 2.5rem;
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 3rem;
}

.footer__brand p {
  margin-top: 18px;
  color: var(--text-dim);
  font-size: 0.95rem;
  max-width: 29ch;
}

.footer__phone {
  display: inline-flex;
  width: max-content;
  margin-top: 26px;
  font-family: var(--font-display);
  font-size: 1.75rem;
  font-weight: 600;
  line-height: 1;
  color: var(--accent);
  letter-spacing: 0;
}

.footer__phone:hover {
  color: var(--accent);
}

.footer__cols {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

.footer__col {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.footer__col h5 {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.15em;
  color: var(--text-mute);
  text-transform: uppercase;
  margin-bottom: 6px;
}
.footer__col a {
  font-size: 0.9rem;
  color: var(--text-dim);
  transition: color var(--dur);
}
.footer__col a:hover { color: var(--accent); }

.footer__beian {
  color: var(--text-mute);
  transition: color var(--dur);
}

.footer__beian:hover {
  color: var(--accent);
}

.footer__bottom {
  max-width: 1320px;
  margin: 0 auto;
  padding: 1.5rem clamp(1rem, 3vw, 2.5rem);
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-mute);
  letter-spacing: 0.04em;
  flex-wrap: wrap;
  gap: 10px;
}

.footer__sysinfo {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--accent-3);
  box-shadow: 0 0 6px var(--accent-3);
  animation: pulse 2s infinite;
}

@media (max-width: 860px) {
  .footer__top { grid-template-columns: 1fr; }
  .footer__cols { grid-template-columns: repeat(2, 1fr); }
  .footer__phone { font-size: 1.5rem; }
}

/* =================================================================
   SCROLL-REVEAL
================================================================= */
[data-reveal] {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity var(--dur-reveal) var(--ease-out), transform var(--dur-reveal) var(--ease-out);
  transition-delay: var(--reveal-delay, 0ms);
}
[data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

/* =================================================================
   NAV DRAWER (mobile)
================================================================= */
.nav__drawer {
  display: none;
  flex-direction: column;
  gap: 6px;
  max-width: 1320px;
  margin: 10px auto 0;
  padding: 16px;
  background: rgba(8, 11, 22, 0.95);
  border: 1px solid var(--border-hi);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(18px);
}
.nav__drawer[data-open="true"] { display: flex; animation: drawer-in var(--dur) var(--ease-out); }
@keyframes drawer-in { from { opacity: 0; transform: translateY(-8px); } }
.nav__drawer a {
  padding: 12px 14px;
  border-radius: 12px;
  color: var(--text-dim);
  font-size: 15px;
}
.nav__drawer-action {
  width: 100%;
  padding: 12px 14px;
  border-radius: 12px;
  color: var(--text-dim);
  background: transparent;
  text-align: left;
  font-size: 15px;
}
.nav__drawer a:hover { background: var(--surface); color: var(--text); }
.nav__drawer-action:hover { background: var(--surface); color: var(--text); }
.nav__drawer .btn { margin-top: 6px; }

/* =================================================================
   REDUCED MOTION
================================================================= */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
  .bg-grid, .bg-glow, #particles, .bg-lasers, .bg-scan { display: none; }
  [data-reveal] { opacity: 1; transform: none; }
}