*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
:root {
  --bg: #050810;
  --bg-card: rgba(255,255,255,0.03);
  --text: #fff;
  --text-secondary: #8899bb;
  --text-muted: #667;
  --text-dim: #445;
  --cyan: #00d4ff;
  --purple: #7c3aed;
  --gold: #f59e0b;
  --green: #10b981;
  --orange: #f97316;
  --pink: #ec4899;
  --gradient: linear-gradient(90deg, #00d4ff, #7c3aed);
}

/* 基准字体随视口平滑缩放：小屏14px → 中屏16px → 大屏18px */
html {
  font-size: clamp(14px, 0.5vw + 12px, 18px);
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
}
a { text-decoration: none; color: inherit; }

/* Navbar */
.navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  display: flex; align-items: center; justify-content: space-between;
  padding: 1.5rem 4rem;
  background: rgba(5, 8, 16, 0.9);
  border-bottom: 1px solid rgba(0, 212, 255, 0.15);
  backdrop-filter: blur(10px);
  transition: box-shadow 0.3s, border-color 0.3s;
}
.navbar__logo { display: flex; align-items: center; gap: 0.75rem; }
.navbar__logo-icon {
  width: 2.25rem; height: 2.25rem; background: var(--gradient);
  border-radius: 0.5rem; display: flex; align-items: center; justify-content: center;
  font-size: 1rem; font-weight: bold; color: var(--text);
}
.navbar__logo-text { font-size: 1.125rem; font-weight: 600; }
.navbar__links { display: flex; gap: 2rem; }
.navbar__link { font-size: 0.9375rem; color: var(--text-secondary); transition: color 0.3s; }
.navbar__link:hover, .navbar__link--active { color: var(--cyan); }
.navbar__cta {
  background: var(--gradient); color: var(--text); padding: 0.625rem 1.5rem;
  border-radius: 1.5rem; font-size: 0.875rem; font-weight: 600; transition: box-shadow 0.3s;
}
.navbar__cta:hover { box-shadow: 0 0 1.25rem rgba(0, 212, 255, 0.4); }

/* Buttons */
.btn {
  display: inline-block; padding: 1rem 2.5rem; border-radius: 1.75rem;
  font-size: 1rem; font-weight: 600; transition: all 0.3s;
}
.btn--primary {
  background: linear-gradient(135deg, #00d4ff, #0099cc); color: var(--text);
  box-shadow: 0 0 1.25rem rgba(0, 212, 255, 0.3);
}
.btn--primary:hover { box-shadow: 0 0 1.875rem rgba(0, 212, 255, 0.5); transform: translateY(-2px); }
.btn--outline {
  border: 1px solid rgba(0, 212, 255, 0.4); color: var(--cyan);
}
.btn--outline:hover { border-color: var(--cyan); background: rgba(0, 212, 255, 0.05); transform: translateY(-2px); }

/* Hero */
.hero {
  position: relative; min-height: 100vh;
  display: flex; align-items: center; justify-content: center;
  text-align: center; padding: 9rem 4rem 4rem;
  background:
    radial-gradient(ellipse at 50% 30%, rgba(0, 212, 255, 0.08) 0%, transparent 60%),
    radial-gradient(ellipse at 20% 70%, rgba(124, 58, 237, 0.06) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 70%, rgba(249, 115, 22, 0.04) 0%, transparent 50%);
}
.hero__grid-bg {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(0, 212, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 212, 255, 0.03) 1px, transparent 1px);
  background-size: 2.5rem 2.5rem; pointer-events: none;
}
.hero__content {
  position: relative; display: flex; flex-direction: column; align-items: center;
  width: min(90vw, 68rem);
}
.hero__badge {
  display: inline-block; background: rgba(0, 212, 255, 0.1);
  border: 1px solid rgba(0, 212, 255, 0.3); border-radius: 1.5rem;
  padding: 0.5rem 1.5rem; font-size: 0.875rem; color: var(--cyan); letter-spacing: 2px; margin-bottom: 2rem;
}
.hero__title {
  font-size: clamp(2.5rem, 5vw, 4.5rem);
  font-weight: 800; line-height: 1.1; margin-bottom: 1.5rem;
}
.hero__title-gradient {
  background: var(--gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.hero__subtitle { font-size: 1.25rem; color: var(--text-secondary); line-height: 1.8; margin-bottom: 2.5rem; }
.hero__buttons { display: flex; gap: 1.25rem; margin-bottom: 3rem; flex-wrap: wrap; justify-content: center; }
.hero__stats {
  display: flex; width: 100%; max-width: 45rem;
  background: var(--bg-card); border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: 1rem; overflow: hidden;
}
.hero__stat { flex: 1; padding: 1.75rem 1.25rem; text-align: center; border-right: 1px solid rgba(255, 255, 255, 0.06); }
.hero__stat:last-child { border-right: none; }
.hero__stat-value { font-size: 2.5rem; font-weight: 800; }
.hero__stat-label { font-size: 0.875rem; color: var(--text-muted); margin-top: 0.5rem; }
.hero__scroll-hint { margin-top: 2.5rem; font-size: 0.8125rem; color: var(--text-dim); animation: pulse 2s infinite; }
@keyframes pulse { 0%, 100% { opacity: 0.4; } 50% { opacity: 1; } }

/* Scene sections */
.scene { padding: 7rem 4rem; text-align: center; }
.scene--orange { --theme-color: var(--orange); }
.scene--cyan   { --theme-color: var(--cyan); }
.scene--purple { --theme-color: var(--purple); }
.scene--gold   { --theme-color: var(--gold); }
.scene--green  { --theme-color: var(--green); }
.scene--pink   { --theme-color: var(--pink); }

.scene__divider {
  width: 5rem; height: 0.25rem;
  background: linear-gradient(90deg, var(--theme-color), transparent);
  margin: 0 auto 2.5rem; border-radius: 2px;
}
.scene__label { display: inline-flex; align-items: center; gap: 0.75rem; margin-bottom: 1.25rem; }
.scene__icon {
  width: 2.75rem; height: 2.75rem;
  background: color-mix(in srgb, var(--theme-color) 15%, transparent);
  border: 1px solid color-mix(in srgb, var(--theme-color) 30%, transparent);
  border-radius: 0.625rem; display: flex; align-items: center; justify-content: center;
  font-size: 1.375rem;
}
.scene__label-text { font-size: 0.875rem; color: var(--theme-color); letter-spacing: 3px; text-transform: uppercase; }
.scene__title {
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  font-weight: 700; margin-bottom: 1.25rem;
}
.scene__title em { font-style: normal; color: var(--theme-color); }
.scene__desc {
  font-size: 1.125rem; color: var(--text-secondary);
  width: min(90vw, 50rem); margin: 0 auto 3rem; line-height: 1.8;
}
.scene__cards {
  display: flex; gap: 1.5rem; justify-content: center; margin-bottom: 2.5rem; flex-wrap: wrap;
}
.scene__card {
  flex: 1 1 20rem; max-width: 24rem;
  background: color-mix(in srgb, var(--theme-color) 5%, transparent);
  border: 1px solid color-mix(in srgb, var(--theme-color) 15%, transparent);
  border-radius: 1rem; padding: 2.25rem 2rem; text-align: center;
  transition: all 0.3s; cursor: pointer;
}
.scene__card:hover {
  border-color: color-mix(in srgb, var(--theme-color) 40%, transparent);
  transform: translateY(-4px); box-shadow: 0 0.5rem 2rem color-mix(in srgb, var(--theme-color) 10%, transparent);
}
.scene__card-icon {
  width: 3.5rem; height: 3.5rem;
  background: color-mix(in srgb, var(--theme-color) 10%, transparent);
  border-radius: 0.875rem; display: flex; align-items: center; justify-content: center;
  margin: 0 auto 1rem; font-size: 1.625rem;
}
.scene__card-title { font-size: 1.25rem; font-weight: 600; margin-bottom: 0.75rem; }
.scene__card-desc { font-size: 0.9375rem; color: var(--text-secondary); line-height: 1.6; }
.scene__data {
  display: inline-flex;
  background: color-mix(in srgb, var(--theme-color) 5%, transparent);
  border: 1px solid color-mix(in srgb, var(--theme-color) 15%, transparent);
  border-radius: 1rem; overflow: hidden;
}
.scene__data-item {
  padding: 1.5rem 2.5rem; text-align: center;
  border-right: 1px solid color-mix(in srgb, var(--theme-color) 10%, transparent);
}
.scene__data-item:last-child { border-right: none; }
.scene__data-value { font-size: 2rem; font-weight: 800; color: var(--theme-color); }
.scene__data-label { font-size: 0.875rem; color: var(--text-muted); margin-top: 0.375rem; }

/* CTA Section */
.cta-section {
  position: relative; padding: 7rem 4rem; text-align: center;
  background: radial-gradient(ellipse at 50% 100%, rgba(0, 212, 255, 0.08) 0%, transparent 60%);
}
.cta-section__grid-bg {
  position: absolute; inset: 0;
  background-image: linear-gradient(rgba(0, 212, 255, 0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 212, 255, 0.02) 1px, transparent 1px);
  background-size: 2.5rem 2.5rem; pointer-events: none;
}
.cta-section__content { position: relative; }
.cta-section__divider {
  width: 5rem; height: 0.25rem;
  background: linear-gradient(90deg, transparent, #00d4ff, transparent);
  margin: 0 auto 2rem; border-radius: 2px;
}
.cta-section__title {
  font-size: clamp(1.75rem, 3.5vw, 2.625rem);
  font-weight: 700; margin-bottom: 1.25rem;
}
.cta-section__title-gradient {
  background: var(--gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.cta-section__subtitle { font-size: 1.125rem; color: var(--text-secondary); margin-bottom: 2.5rem; }
.cta-section__buttons { display: flex; gap: 1.25rem; justify-content: center; flex-wrap: wrap; }

/* Footer */
.footer { border-top: 1px solid rgba(255, 255, 255, 0.06); }
.footer__inner {
  display: flex; align-items: center; justify-content: space-between;
  padding: 2rem 4rem; flex-wrap: wrap; gap: 1rem;
}
.footer__links { display: flex; gap: 2rem; font-size: 0.875rem; color: var(--text-muted); }
.footer__links a:hover { color: var(--cyan); }
.footer__copyright { font-size: 0.8125rem; color: var(--text-dim); }

/* Scroll reveal animation */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Responsive */
@media (max-width: 768px) {
  .navbar { padding: 1rem 1.5rem; }
  .navbar__links { display: none; }
  .hero { padding: 7rem 1.5rem 2.5rem; }
  .hero__stats { flex-wrap: wrap; }
  .hero__stat { flex: 1 1 45%; border-bottom: 1px solid rgba(255,255,255,0.06); padding: 1rem 0.75rem; }
  .hero__stat:nth-child(2) { border-right: none; }
  .hero__stat:nth-child(3), .hero__stat:nth-child(4) { border-bottom: none; }
  .hero__buttons { flex-direction: column; align-items: center; }
  .scene { padding: 5rem 1.5rem; }
  .scene__cards { flex-direction: column; align-items: center; }
  .scene__card { flex: 1 1 auto; max-width: 100%; width: 100%; }
  .scene__data { flex-direction: column; width: 100%; }
  .scene__data-item { border-right: none; border-bottom: 1px solid color-mix(in srgb, var(--theme-color) 10%, transparent); padding: 0.875rem 1.5rem; }
  .scene__data-item:last-child { border-bottom: none; }
  .cta-section { padding: 5rem 1.5rem; }
  .footer__inner { padding: 1.5rem; flex-direction: column; text-align: center; }
}