/* ─── Navigation ─────────────────────────────────────────── */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  transition: background var(--dur-normal) var(--ease-out),
              backdrop-filter var(--dur-normal) var(--ease-out),
              border-color var(--dur-normal) var(--ease-out);
  border-bottom: 1px solid transparent;
}

.nav.scrolled {
  background: rgba(10, 10, 15, 0.88);
  backdrop-filter: blur(16px) saturate(180%);
  border-bottom-color: var(--color-border);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.nav__logo {
  display: flex;
  flex-direction: column;
  gap: 2px;
  flex-shrink: 0;
}

.nav__logo-main {
  font-size: var(--text-xl);
  font-weight: var(--font-black);
  letter-spacing: -0.04em;
  background: var(--grad-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
}

.nav__logo-sub {
  font-size: var(--text-xs);
  color: var(--color-muted);
  letter-spacing: 0.05em;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--sp-5);
}

.nav__link {
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--color-muted);
  transition: color var(--dur-fast) var(--ease-out);
  position: relative;
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -3px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--color-primary);
  transition: width var(--dur-normal) var(--ease-out);
}

.nav__link:hover { color: var(--color-text); }
.nav__link:hover::after { width: 100%; }

.nav__cta {
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  padding: 10px var(--sp-3);
  border-radius: var(--radius-full);
  background: var(--grad-primary);
  color: #0A0A0F;
  transition: box-shadow var(--dur-normal) var(--ease-out),
              transform var(--dur-fast) var(--ease-out);
}

.nav__cta:hover {
  box-shadow: var(--glow-primary);
  transform: translateY(-1px);
}

.nav__hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: var(--sp-1);
  cursor: pointer;
}

.nav__hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform var(--dur-normal) var(--ease-out),
              opacity var(--dur-fast) var(--ease-out);
}

/* ─── Hero ─────────────────────────────────────────────────── */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: center;
  padding-top: var(--nav-height);
  overflow: hidden;
}

.hero__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  background: var(--color-bg);
}

.hero__bg::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--grad-hero);
}

.hero__bg-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(123,47,255,0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(123,47,255,0.06) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 40%, black 0%, transparent 75%);
}

.hero__orb {
  position: absolute;
  border-radius: var(--radius-full);
  filter: blur(80px);
  pointer-events: none;
}

.hero__orb--1 {
  width: 600px;
  height: 600px;
  top: -200px;
  right: -100px;
  background: rgba(123, 47, 255, 0.3);
}

.hero__orb--2 {
  width: 400px;
  height: 400px;
  bottom: -100px;
  left: -80px;
  background: rgba(0, 255, 178, 0.15);
}

.hero__content {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--sp-12);
  align-items: center;
  padding-block: var(--sp-16);
  width: 100%;
}

.hero__text { max-width: 600px; }

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-1);
  padding: 6px 14px;
  border-radius: var(--radius-full);
  border: 1px solid rgba(0, 255, 178, 0.3);
  background: rgba(0, 255, 178, 0.06);
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  letter-spacing: 0.08em;
  color: var(--color-primary);
  margin-bottom: var(--sp-3);
  text-transform: uppercase;
}

.hero__badge-dot {
  width: 6px;
  height: 6px;
  border-radius: var(--radius-full);
  background: var(--color-primary);
  box-shadow: var(--glow-primary);
  animation: pulse 2s ease-in-out infinite;
}

.hero__title {
  font-size: var(--text-6xl);
  font-weight: var(--font-black);
  letter-spacing: -0.04em;
  line-height: 1.05;
  margin-bottom: var(--sp-3);
}

.hero__desc {
  font-size: var(--text-lg);
  color: var(--color-muted);
  line-height: var(--leading-snug);
  margin-bottom: var(--sp-5);
  max-width: 480px;
}

.hero__actions {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  flex-wrap: wrap;
}

.hero__visual {
  position: relative;
}

/* ─── Sections ─────────────────────────────────────────────── */
.section {
  padding-block: var(--section-gap);
  position: relative;
}

.section--alt {
  background: var(--color-surface);
}

.section__header {
  margin-bottom: var(--sp-10);
}

.section__header--center {
  text-align: center;
  align-items: center;
  display: flex;
  flex-direction: column;
}

/* ─── Services grid ────────────────────────────────────────── */
.services__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--sp-3);
}

/* ─── Why Us grid ──────────────────────────────────────────── */
.why__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--sp-4);
  align-items: start;
}

.why__stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--sp-3);
}

/* ─── About ────────────────────────────────────────────────── */
.about__inner {
  display: grid;
  grid-template-columns: 5fr 7fr;
  gap: var(--sp-12);
  align-items: center;
}

/* ─── Contact ──────────────────────────────────────────────── */
.contact__inner {
  display: grid;
  grid-template-columns: 5fr 7fr;
  gap: var(--sp-10);
  align-items: start;
}

.contact__info-list {
  display: flex;
  flex-direction: column;
  gap: var(--sp-4);
  margin-top: var(--sp-5);
}

/* ─── Footer ───────────────────────────────────────────────── */
.footer {
  padding-block: var(--sp-8);
  border-top: 1px solid var(--color-border);
}

.footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--sp-3);
}

.footer__brand {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.footer__brand-en {
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  color: var(--color-text);
}

.footer__brand-cn {
  font-size: var(--text-xs);
  color: var(--color-muted);
}

.footer__links {
  display: flex;
  gap: var(--sp-4);
}

.footer__link {
  font-size: var(--text-sm);
  color: var(--color-muted);
  transition: color var(--dur-fast) var(--ease-out);
}

.footer__link:hover { color: var(--color-primary); }

.footer__copy {
  font-size: var(--text-xs);
  color: var(--color-muted);
  text-align: right;
}