/* ── 导航 ── */
nav {
  position: fixed; top: 0; left: 0; right: 0;
  z-index: 100;
  display: flex; justify-content: space-between; align-items: center;
  height: 64px;
  padding: 0 32px;
  background: rgba(10, 10, 15, 0.6);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(30, 30, 48, 0.5);
}

.nav-logo {
  font-size: 18px; font-weight: 800;
  letter-spacing: -0.5px;
  color: #1e40af;
}

.nav-logo-oner {
  background: linear-gradient(135deg, #1e40af, #ff00ff, #1e40af);
  background-size: 200% 200%;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: gradientText 3s ease-in-out infinite;
  opacity: var(--pulse, 1);
}

.nav-links { display: flex; gap: 32px; }
.nav-right { display: flex; align-items: center; gap: 12px; margin-left: auto; }

.nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  transition: color 0.2s var(--ease-out);
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px; left: 0;
  width: 0; height: 2px;
  background: var(--primary);
  transition: width 0.25s var(--ease-out);
}

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

/* ── Hero ── */
.hero {
  position: relative; z-index: 10;
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  min-height: 100vh;
  text-align: center;
  padding: 120px 24px 80px;
}

/* ── 内容区 ── */
.content {
  position: relative; z-index: 10;
  max-width: 800px;
  margin: 0 auto;
  padding: 0 24px 120px;
}

.content-section {
  margin-bottom: 80px;
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.8s var(--ease-out), transform 0.8s var(--ease-out);
}

.content-section.visible {
  opacity: 1;
  transform: translateY(0);
}

.content-section h2 {
  font-size: 24px;
  font-weight: 700;
  letter-spacing: -0.5px;
  margin-bottom: 16px;
}

.content-section p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-secondary);
  margin-bottom: 16px;
}

/* ── 页脚 ── */
footer {
  position: relative; z-index: 10;
  text-align: center;
  padding: 40px 24px;
  border-top: 1px solid rgba(30, 30, 48, 0.6);
  color: var(--text-tertiary);
  font-size: 13px;
}

footer::before {
  content: '';
  position: absolute;
  top: -1px; left: 10%; right: 10%;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(30,64,175,0.25), rgba(255,0,255,0.12), transparent);
}

/* ── 导航突出链接 ── */
.nav-link-highlight {
  color: var(--primary) !important;
  font-weight: 600 !important;
}
.nav-link-highlight::after {
  width: 100% !important;
  background: linear-gradient(90deg, var(--primary), var(--accent)) !important;
}

/* ── Hero 副标题层级 ── */
.hero-sub-line {
  font-size: clamp(18px, 3vw, 32px);
  font-weight: 400;
  color: var(--text-secondary);
  letter-spacing: 6px;
  text-transform: uppercase;
  opacity: 0;
  animation: fadeUp 0.7s var(--ease-out) 0.15s forwards;
}

.hero-tagline {
  font-size: clamp(14px, 1.5vw, 18px);
  letter-spacing: 1px;
  max-width: 600px;
  color: rgba(255,255,255,0.45);
  margin: 0 auto 40px;
  line-height: 1.6;
  opacity: 0;
  animation: fadeUp 0.7s var(--ease-out) 0.5s forwards;
}

.hero-concepts {
  font-size: 12px;
  letter-spacing: 2px;
  color: rgba(255,255,255,0.2);
  margin-bottom: 40px;
  opacity: 0;
  animation: fadeUp 0.7s var(--ease-out) 0.6s forwards;
}

/* ── CTA 区 ── */
.cta-section {
  text-align: center;
  padding: 48px 0;
}
.cta-section p {
  max-width: 500px;
  margin: 12px auto 24px;
}