:root {
  --neon-blue: #00b4d8;
  --neon-pink: #e94560;
  --neon-purple: #7b2cbf;
  --neon-green: #2a9d8f;
  --bg: #0a0a1a;
  --text: #e8e8f0;
  --text-dim: rgba(255,255,255,0.5);
  --text-faint: rgba(255,255,255,0.26);
  --border: rgba(255,255,255,0.06);
  --border-hover: rgba(255,255,255,0.14);
  --glass-bg: rgba(255,255,255,0.04);
  --glass-border: rgba(255,255,255,0.07);
  --glass-hl: rgba(255,255,255,0.2);
  --card-text: rgba(255,255,255,0.65);
  --shadow: 0 4px 24px rgba(0,0,0,0.4);
  --radius: 20px;
  --radius-sm: 14px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  font-family: 'Noto Sans SC', sans-serif;
  background: var(--bg);
  color: var(--text);
  overflow-x: hidden;
  line-height: 1.6;
  animation: pageIn 0.45s cubic-bezier(0.22, 1, 0.36, 1) both;
}
@keyframes pageIn {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}
body.page-exit {
  opacity: 0;
  transform: translateY(-12px);
  transition: all 0.28s cubic-bezier(0.4, 0, 1, 1);
  animation: none;
}

/* Canvas */
#danmakuCanvas, #trailCanvas {
  position: fixed; top: 0; left: 0; width: 100%; height: 100%;
  pointer-events: none;
}
#danmakuCanvas { z-index: 1; opacity: 0.45; }
#trailCanvas { z-index: 2; }

/* 背景光球 */
.bg-orbs {
  position: fixed; inset: 0; z-index: 0;
  overflow: hidden; pointer-events: none;
}
.orb {
  position: absolute; border-radius: 50%;
  filter: blur(140px);
  opacity: 0.28;
  animation: orbFloat 30s ease-in-out infinite alternate;
}
.orb-1 { width: 700px; height: 700px; background: var(--neon-purple); top: -20%; left: -15%; animation-duration: 35s; }
.orb-2 { width: 600px; height: 600px; background: var(--neon-blue); bottom: -25%; right: -15%; animation-duration: 40s; animation-delay: -10s; }
.orb-3 { width: 500px; height: 500px; background: var(--neon-pink); top: 50%; left: 60%; animation-duration: 32s; animation-delay: -20s; opacity: 0.18; }
@keyframes orbFloat {
  0% { transform: translate(0, 0) scale(1); }
  100% { transform: translate(40px, -40px) scale(1.1); }
}

/* 导航 */
.top-nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0.8rem 2rem;
  background: rgba(10,10,26,0.7);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap; gap: 0.5rem;
}
.nav-logo {
  font-family: 'Orbitron', sans-serif;
  font-size: 1.5rem; font-weight: 900;
  background: linear-gradient(135deg, var(--neon-blue), var(--neon-pink));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text; text-decoration: none;
}
.nav-links { display: flex; align-items: center; gap: 1.8rem; }
.nav-links a {
  color: var(--text-dim); text-decoration: none;
  font-size: 0.88rem; font-weight: 500;
  position: relative; padding: 0.25rem 0;
  transition: color 0.25s;
}
.nav-links a::after {
  content: ''; position: absolute; bottom: -2px; left: 0; width: 0; height: 2px;
  background: var(--neon-blue); border-radius: 2px;
  transition: width 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}
.nav-links a:hover { color: var(--neon-blue); }
.nav-links a:hover::after { width: 100%; }
.nav-links a.active { color: var(--neon-pink); font-weight: 700; }
.nav-links a.active::after { width: 100%; background: var(--neon-pink); }
.nav-external {
  color: var(--neon-green) !important;
  font-weight: 700 !important;
  padding: 0.22rem 0.7rem !important;
  border: 1px solid rgba(42,157,143,0.3);
  border-radius: 50px;
  transition: all 0.25s !important;
}
.nav-external:hover {
  background: rgba(42,157,143,0.12) !important;
  color: var(--neon-green) !important;
}
.nav-external::after { display: none !important; }

/* 液态玻璃 */
.liquid-glass {
  background: var(--glass-bg);
  backdrop-filter: blur(16px) saturate(150%);
  -webkit-backdrop-filter: blur(16px) saturate(150%);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  overflow: hidden;
}
.liquid-glass:hover {
  transform: translateY(-2px);
  border-color: var(--border-hover);
  box-shadow: 0 12px 40px rgba(0,0,0,0.25);
}

/* 页脚 */
.site-footer {
  text-align: center; padding: 2rem;
  color: var(--text-faint); font-size: 0.78rem;
  border-top: 1px solid var(--border);
  position: relative; z-index: 10;
}
.site-footer .big-67 {
  font-family: 'Orbitron', sans-serif; font-size: 2.5rem; font-weight: 900;
  background: linear-gradient(135deg, var(--neon-blue), var(--neon-pink));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text; opacity: 0.18; line-height: 1; margin-bottom: 0.8rem;
}

/* 滚动动画 */
.reveal { opacity: 0; transform: translateY(30px); transition: all 0.8s ease; }
.reveal.active { opacity: 1; transform: translateY(0); }

/* 响应式 */
@media (max-width: 768px) {
  .top-nav { padding: 0.7rem 1rem; }
  .nav-links { gap: 1rem; }
  .nav-links a { font-size: 0.8rem; }
}