/* ==========================================================================
   ABOX Technologies — site styles
   ========================================================================== */

:root {
  --bg: #070B14;
  --bg-alt: #0B1220;
  --surface: #0F172A;
  --surface-2: #131C31;
  --border: rgba(148, 163, 184, 0.14);
  --text: #E2E8F0;
  --text-muted: #94A3B8;
  --text-dim: #64748B;
  --cyan: #22D3EE;
  --violet: #8B5CF6;
  --cyan-soft: rgba(34, 211, 238, 0.14);
  --violet-soft: rgba(139, 92, 246, 0.16);
  --grad: linear-gradient(120deg, var(--cyan), var(--violet));
  --radius: 18px;
  --radius-sm: 12px;
  --container: 1160px;
  --font: "Inter", "Segoe UI", "PingFang SC", "Microsoft YaHei", "Noto Sans SC", Helvetica, Arial, sans-serif;
  --shadow: 0 20px 60px rgba(0, 0, 0, 0.45);
  --header-h: 72px;
}

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

html { scroll-behavior: smooth; }

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

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

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

h1, h2, h3 { margin: 0; line-height: 1.15; letter-spacing: -0.02em; }
h1 { font-size: clamp(2.4rem, 6vw, 4.2rem); font-weight: 800; }
h2 { font-size: clamp(1.8rem, 3.6vw, 2.6rem); font-weight: 700; }
h3 { font-size: 1.15rem; font-weight: 600; }

p { margin: 0; }

.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: 24px;
}

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

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cyan);
  margin-bottom: 16px;
}
.eyebrow::before {
  content: "";
  width: 22px;
  height: 2px;
  background: var(--grad);
  border-radius: 2px;
}

.sub {
  color: var(--text-muted);
  font-size: 1.05rem;
  max-width: 62ch;
}

.skip-link {
  position: absolute;
  left: 16px;
  top: -60px;
  padding: 10px 14px;
  background: var(--cyan);
  color: #04121a;
  border-radius: 8px;
  font-weight: 600;
  z-index: 1000;
}
.skip-link:focus { top: 16px; }

/* Buttons ------------------------------------------------------------------ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 24px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid transparent;
  transition: transform .18s ease, box-shadow .18s ease, background .18s ease, border-color .18s ease;
  cursor: pointer;
  white-space: nowrap;
}
.btn:hover { transform: translateY(-2px); }
.btn:focus-visible { outline: 2px solid var(--cyan); outline-offset: 3px; }

.btn-primary {
  background: var(--grad);
  color: #04121a;
  box-shadow: 0 10px 30px rgba(34, 211, 238, 0.22);
}
.btn-primary:hover { box-shadow: 0 14px 40px rgba(139, 92, 246, 0.35); }

.btn-ghost {
  background: transparent;
  color: var(--text);
  border-color: var(--border);
}
.btn-ghost:hover { border-color: rgba(148, 163, 184, 0.4); background: rgba(255, 255, 255, 0.03); }

.btn-sm { padding: 9px 18px; font-size: 0.88rem; }
.btn-lg { padding: 18px 32px; font-size: 1.05rem; }

/* Header ------------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-h);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  background: rgba(7, 11, 20, 0.72);
  border-bottom: 1px solid var(--border);
}

.nav-wrap {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
}
.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1;
  font-weight: 800;
  font-size: 1.25rem;
  letter-spacing: -0.03em;
}
.brand-text small {
  font-size: 0.56rem;
  font-weight: 600;
  letter-spacing: 0.26em;
  color: #7DD3FC;
  margin-top: 3px;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 28px;
  font-size: 0.93rem;
  font-weight: 500;
  color: var(--text-muted);
}
.site-nav > a:not(.btn) { transition: color .15s ease; }
.site-nav > a:not(.btn):hover { color: var(--text); }

.lang-toggle {
  background: transparent;
  color: var(--text-muted);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 6px 12px;
  font: inherit;
  font-size: 0.82rem;
  cursor: pointer;
  transition: color .15s ease, border-color .15s ease;
}
.lang-toggle:hover { color: var(--text); border-color: rgba(148, 163, 184, 0.4); }

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: transparent;
  cursor: pointer;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
}
.nav-toggle span {
  width: 20px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform .2s ease, opacity .2s ease;
}
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Hero --------------------------------------------------------------------- */
.hero {
  position: relative;
  padding-block: clamp(64px, 10vw, 128px);
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(60% 50% at 75% 40%, rgba(139, 92, 246, 0.22), transparent 70%),
    radial-gradient(45% 40% at 20% 70%, rgba(34, 211, 238, 0.14), transparent 70%);
}
.hero-bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(148, 163, 184, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(148, 163, 184, 0.06) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(70% 70% at 50% 40%, #000 30%, transparent 100%);
  -webkit-mask-image: radial-gradient(70% 70% at 50% 40%, #000 30%, transparent 100%);
}

.hero-grid {
  position: relative;
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  align-items: center;
  gap: 48px;
}

.hero-copy .eyebrow { margin-bottom: 20px; }
.hero-copy h1 { margin-bottom: 22px; }

.lead {
  font-size: 1.15rem;
  color: var(--text-muted);
  max-width: 56ch;
  margin-bottom: 32px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 36px;
}

.hero-tags {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.hero-tags li {
  padding: 6px 14px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.02);
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.hero-visual {
  position: relative;
  aspect-ratio: 1 / 1;
  max-width: 460px;
  width: 100%;
  margin-inline: auto;
  display: grid;
  place-items: center;
}

.hero-mark {
  width: 78%;
  height: auto;
  filter: drop-shadow(0 30px 60px rgba(34, 211, 238, 0.18));
  animation: float 7s ease-in-out infinite;
}

.orbit {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  border: 1px dashed rgba(148, 163, 184, 0.18);
  pointer-events: none;
}
.orbit::after {
  content: "";
  position: absolute;
  top: -4px;
  left: 50%;
  width: 8px;
  height: 8px;
  margin-left: -4px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 14px var(--cyan);
}
.orbit-a { animation: spin 28s linear infinite; }
.orbit-b { inset: 12%; border-color: rgba(139, 92, 246, 0.24); animation: spin 18s linear infinite reverse; }
.orbit-b::after { background: var(--violet); box-shadow: 0 0 14px var(--violet); }

.glow-pulse { animation: pulse 4s ease-in-out infinite; transform-origin: 92px 62px; }
.net-nodes circle { animation: twinkle 3.2s ease-in-out infinite; }
.net-nodes circle:nth-child(2n) { animation-delay: .8s; }
.net-nodes circle:nth-child(3n) { animation-delay: 1.6s; }
.net-dust circle { animation: drift 6s ease-in-out infinite; }
.net-dust circle:nth-child(2n) { animation-delay: 1.5s; }
.net-dust circle:nth-child(3n) { animation-delay: 3s; }

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}
@keyframes spin { to { transform: rotate(360deg); } }
@keyframes pulse {
  0%, 100% { opacity: .75; transform: scale(1); }
  50% { opacity: 1; transform: scale(1.06); }
}
@keyframes twinkle {
  0%, 100% { opacity: .7; }
  50% { opacity: 1; }
}
@keyframes drift {
  0%, 100% { transform: translateY(0); opacity: .6; }
  50% { transform: translateY(-6px); opacity: 1; }
}

/* Sections ----------------------------------------------------------------- */
.section { padding-block: clamp(72px, 9vw, 120px); }
.section-alt {
  background: linear-gradient(180deg, var(--bg-alt), var(--bg));
  border-block: 1px solid var(--border);
}

.section-head {
  max-width: 720px;
  margin-bottom: 48px;
}
.section-head h2 { margin-bottom: 16px; }

.grid { display: grid; gap: 20px; }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.card {
  position: relative;
  padding: 28px 24px;
  border-radius: var(--radius);
  background: linear-gradient(180deg, var(--surface), var(--bg-alt));
  border: 1px solid var(--border);
  transition: transform .2s ease, border-color .2s ease, box-shadow .2s ease;
}
.card::before {
  content: "";
  position: absolute;
  inset: -1px;
  border-radius: inherit;
  padding: 1px;
  background: var(--grad);
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  opacity: 0;
  transition: opacity .2s ease;
}
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.card:hover::before { opacity: .8; }
.card h3 { margin-bottom: 10px; }
.card p { color: var(--text-muted); font-size: 0.95rem; }

.card-icon {
  width: 46px;
  height: 46px;
  border-radius: 12px;
  display: grid;
  place-items: center;
  background: var(--cyan-soft);
  color: var(--cyan);
  margin-bottom: 20px;
}
.card-icon svg { width: 24px; height: 24px; }
.card:nth-child(2n) .card-icon { background: var(--violet-soft); color: #A78BFA; }

/* Steps -------------------------------------------------------------------- */
.steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  counter-reset: step;
}
.step {
  position: relative;
  padding: 28px 24px 28px;
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border);
}
.step::after {
  content: "";
  position: absolute;
  top: 44px;
  right: -21px;
  width: 20px;
  height: 1px;
  background: linear-gradient(90deg, var(--cyan), transparent);
}
.step:last-child::after { display: none; }
.step-num {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  margin-bottom: 14px;
}
.step h3 { margin-bottom: 10px; font-size: 1.25rem; }
.step p { color: var(--text-muted); font-size: 0.95rem; }

/* Why ---------------------------------------------------------------------- */
.why-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 56px;
  align-items: center;
}
.why-copy h2 { margin-bottom: 16px; }
.why-copy .sub { margin-bottom: 28px; }

.checks {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 14px;
  color: var(--text-muted);
}
.checks li {
  position: relative;
  padding-left: 32px;
}
.checks li strong { color: var(--text); }
.checks li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 5px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--grad);
  -webkit-mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Ccircle cx='12' cy='12' r='12'/%3E%3C/svg%3E") center / contain no-repeat;
  mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Ccircle cx='12' cy='12' r='12'/%3E%3C/svg%3E") center / contain no-repeat;
}
.checks li::after {
  content: "";
  position: absolute;
  left: 5px;
  top: 9px;
  width: 8px;
  height: 5px;
  border-left: 2px solid #04121a;
  border-bottom: 2px solid #04121a;
  transform: rotate(-45deg);
}

.quote-card {
  margin: 0;
  padding: 40px 36px;
  border-radius: var(--radius);
  background:
    radial-gradient(80% 80% at 100% 0%, rgba(139, 92, 246, 0.25), transparent 60%),
    radial-gradient(70% 70% at 0% 100%, rgba(34, 211, 238, 0.2), transparent 60%),
    var(--surface);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}
.quote-card blockquote {
  margin: 0 0 20px;
  font-size: 1.35rem;
  font-weight: 500;
  line-height: 1.45;
  letter-spacing: -0.01em;
}
.quote-card figcaption {
  color: var(--text-dim);
  font-size: 0.9rem;
  letter-spacing: 0.06em;
}

/* Contact ------------------------------------------------------------------ */
.section-cta { padding-bottom: clamp(72px, 9vw, 140px); }
.cta-box {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 40px;
  align-items: center;
  padding: clamp(36px, 6vw, 64px);
  border-radius: 28px;
  background:
    radial-gradient(60% 100% at 100% 50%, rgba(34, 211, 238, 0.16), transparent 70%),
    linear-gradient(180deg, var(--surface-2), var(--bg-alt));
  border: 1px solid var(--border);
  max-width: calc(var(--container) - 48px);
}
.cta-box h2 { margin-bottom: 14px; }
.cta-actions {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 14px;
}
.cta-actions .btn { width: 100%; max-width: 360px; }
.cta-note { color: var(--text-dim); font-size: 0.9rem; }

/* Footer ------------------------------------------------------------------- */
.site-footer {
  border-top: 1px solid var(--border);
  padding-block: 36px;
  color: var(--text-dim);
  font-size: 0.9rem;
}
.footer-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}
.footer-tag { color: var(--text-muted); }
.footer-copy a { color: var(--text-muted); }
.footer-copy a:hover { color: var(--text); }

/* Reveal ------------------------------------------------------------------- */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity .6s ease, transform .6s ease;
}
.reveal.is-visible { opacity: 1; transform: none; }
.grid .reveal:nth-child(2), .steps .reveal:nth-child(2) { transition-delay: .08s; }
.grid .reveal:nth-child(3), .steps .reveal:nth-child(3) { transition-delay: .16s; }
.grid .reveal:nth-child(4), .steps .reveal:nth-child(4) { transition-delay: .24s; }

/* Language tweaks ---------------------------------------------------------- */
html[lang="zh-CN"] h1 { letter-spacing: 0; line-height: 1.25; }
html[lang="zh-CN"] h2, html[lang="zh-CN"] h3 { letter-spacing: 0; }
html[lang="zh-CN"] .eyebrow, html[lang="zh-CN"] .hero-tags li { letter-spacing: 0.08em; }

/* Responsive --------------------------------------------------------------- */
@media (max-width: 1024px) {
  .grid-4, .steps { grid-template-columns: repeat(2, 1fr); }
  .step::after { display: none; }
}

@media (max-width: 860px) {
  .hero-grid { grid-template-columns: 1fr; gap: 24px; }
  .hero-visual { max-width: 340px; order: -1; }
  .why-grid, .cta-box { grid-template-columns: 1fr; }
  .cta-actions { align-items: stretch; }
  .cta-actions .btn { max-width: none; }

  .nav-toggle { display: flex; }
  .site-nav {
    position: absolute;
    top: var(--header-h);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 6px;
    padding: 16px 24px 24px;
    background: rgba(7, 11, 20, 0.96);
    border-bottom: 1px solid var(--border);
    display: none;
  }
  .site-nav.is-open { display: flex; }
  .site-nav > a:not(.btn) { padding: 12px 4px; border-bottom: 1px solid var(--border); }
  .site-nav .btn { margin-top: 10px; }
  .lang-toggle { align-self: flex-start; margin-top: 8px; }
}

@media (max-width: 560px) {
  .grid-4, .steps { grid-template-columns: 1fr; }
  .hero-actions .btn { width: 100%; }
  .footer-wrap { flex-direction: column; align-items: flex-start; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .reveal { opacity: 1; transform: none; }
}