/* 基础主题与变量 */
:root {
  --bg: #0b0d0f;
  --bg-weak: #0e1113;
  --text: #e6f3ee;
  --text-dim: #a7b8b1;
  --surface: #121518;
  --outline: #1c2126;

  /* 渐变高亮 */
  --accent-a: #3ee1a3;
  --accent-b: #32f08c;
  --accent-c: #60f2bd;
  --accent-d: #a0fde7;
  --accent-gradient: linear-gradient(90deg, var(--accent-a) 0, var(--accent-b) 36%, var(--accent-c) 71.63%, var(--accent-d) 100%);
}

* { box-sizing: border-box; }
html, body { height: 100%; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  line-height: 1.6;
}

/* 背景网格与几何元素 */
.bg { position: fixed; inset: 0; z-index: -1; }
.bg-grid {
  position: absolute;
  inset: 0;
  background-image: linear-gradient(rgba(50, 240, 140, 0.06) 1px, transparent 1px), linear-gradient(90deg, rgba(50,240,140,0.06) 1px, transparent 1px);
  background-size: 40px 40px, 40px 40px;
  background-position: center center;
}
.bg-glow {
  position: absolute; inset: 0; pointer-events: none;
  background: radial-gradient(60% 60% at 50% 10%, rgba(50,240,140,0.15), transparent 60%), radial-gradient(50% 50% at 85% 70%, rgba(160,253,231,0.08), transparent 60%);
  filter: blur(20px);
}
.bg-shapes { position: absolute; inset: 0; overflow: hidden; }
.shape {
  position: absolute; display: block;
  width: 160px; height: 160px;
  border: 1px solid rgba(50,240,140,0.35);
  border-radius: 12px; /* 小半径，不要过于圆润 */
  transform: rotate(18deg);
  backdrop-filter: blur(2px);
}
.shape::after { /* 细微渐变描边 */
  content: ""; position: absolute; inset: -1px;
  border-radius: 12px;
  mask: linear-gradient(#000, #000) content-box, linear-gradient(#000, #000);
  -webkit-mask-composite: xor; mask-composite: exclude;
  padding: 1px; border: 1px solid transparent;
  background: var(--accent-gradient) border-box;
}
.s1 { top: 8%; left: 6%; }
.s2 { top: 22%; right: 10%; transform: rotate(-12deg); }
.s3 { bottom: 18%; left: 14%; transform: rotate(33deg); }
.s4 { bottom: 8%; right: 6%; transform: rotate(-28deg); }

/* 导航 */
.site-header { position: sticky; top: 0; backdrop-filter: blur(6px); z-index: 20; }
.nav {
  max-width: 1080px; margin: 0 auto; padding: 16px 20px;
  display: flex; align-items: center; justify-content: space-between;
}
.brand { font-weight: 700; text-decoration: none; font-size: clamp(18px, 2.2vw, 22px); }
.gradient-text { background: var(--accent-gradient); -webkit-background-clip: text; background-clip: text; color: transparent; }
.menu { list-style: none; margin: 0; padding: 0; display: flex; gap: 24px; }
.menu a { color: var(--text); text-decoration: none; font-size: 14px; opacity: .9; }
.menu a:hover { color: #bdfbe5; }

.nav-toggle { display: none; background: transparent; border: 0; padding: 6px; }
.nav-toggle .bar { display: block; width: 24px; height: 2px; background: #a0fde7; margin: 5px 0; }
/* 移动端菜单展开样式 */
.nav.open { position: relative; }
.nav.open .menu {
  display: flex;
  flex-direction: column;
  gap: 14px;
  position: absolute;
  right: 20px; top: 56px;
  background: var(--bg-weak);
  padding: 12px 16px;
  border-radius: 12px;
  box-shadow: 0 0 0 1px rgba(50,240,140,.18) inset;
}

/* 章节与布局 */
.section { max-width: 1080px; margin: 0 auto; padding: 72px 20px; }
.hero { padding-top: 88px; text-align: center; }
.logo { font-size: clamp(48px, 10vw, 108px); letter-spacing: .02em; margin: 0 0 8px; }
.subtitle { margin: 0 auto 14px; max-width: 720px; color: var(--text-dim); font-weight: 500; }
.lead { margin: 0 auto 22px; max-width: 840px; color: #cfe9de; }

.cta { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }
.btn { cursor: pointer; text-decoration: none; font-weight: 600; border-radius: 12px; padding: 10px 16px; font-size: 14px; transition: transform .2s ease, box-shadow .2s ease; }
.btn-primary { color: #0b0d0f; background: var(--accent-gradient); box-shadow: 0 0 0 1px rgba(50,240,140,.35) inset; }
.btn-outline { color: #bdfbe5; background: transparent; box-shadow: 0 0 0 1px rgba(50,240,140,.35) inset; }
.btn:hover { transform: translateY(-1px); }

.scroll-indicator { width: 22px; height: 36px; margin: 28px auto 0; border-radius: 10px; box-shadow: 0 0 0 1px rgba(50,240,140,.35) inset; display: grid; place-items: center; }
.scroll-indicator .dot { width: 6px; height: 6px; border-radius: 50%; background: #32f08c; animation: dotSlide 1.6s ease-in-out infinite; }
@keyframes dotSlide { 0% { transform: translateY(-8px); opacity: .6; } 50% { transform: translateY(6px); opacity: 1; } 100% { transform: translateY(-8px); opacity: .6; } }

.section-title { font-size: clamp(24px, 4.2vw, 36px); margin: 0 0 10px; letter-spacing: .01em; }
.section-desc { margin: 0 0 24px; color: #cfe9de; max-width: 900px; }

.cards { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; }
.card { background: var(--surface); border-radius: 12px; padding: 18px; box-shadow: 0 0 0 1px rgba(50,240,140,.18) inset; }
.card h3 { margin: 0 0 6px; font-size: 18px; color: #dbf9ee; }
.card p { margin: 0; color: var(--text-dim); }

.feature-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; }
.feature-list li { display: flex; align-items: center; gap: 10px; padding: 12px 14px; background: var(--surface); border-radius: 12px; box-shadow: 0 0 0 1px rgba(50,240,140,.18) inset; }
.feature-list .bullet { width: 10px; height: 10px; border-radius: 2px; background: var(--accent-gradient); box-shadow: 0 0 0 1px rgba(50,240,140,.35) inset; }

.governance-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; }
.gov-item { background: var(--surface); border-radius: 12px; padding: 18px; box-shadow: 0 0 0 1px rgba(50,240,140,.18) inset; }
.gov-item h3 { margin: 0 0 6px; font-size: 18px; color: #dbf9ee; }
.gov-item p { margin: 0; color: var(--text-dim); }

.tech-columns { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; }
.tech-columns > div { background: var(--surface); border-radius: 12px; padding: 18px; box-shadow: 0 0 0 1px rgba(50,240,140,.18) inset; }

.site-footer { text-align: center; padding: 40px 20px; color: #a7b8b1; }

/* 滚动显隐效果 */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity .6s ease, transform .6s ease; }
.reveal.visible { opacity: 1; transform: none; }

/* 响应式：移动端 */
@media (max-width: 840px) {
  .menu { display: none; }
  .nav-toggle { display: inline-block; }
  .section { padding: 56px 16px; }
  .cards, .governance-grid, .tech-columns { grid-template-columns: 1fr; }
}

/* 减少动态：无障碍偏好 */
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}