:root {
  --bg: #0a0a0a;
  --fg: #e8e8ed;
  --fg-muted: #8a8a96;
  --fg-dim: #4a4a55;
  --border: #1f1f24;
  --accent: #ffffff;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html,
body {
  background: var(--bg);
  color: var(--fg);
  font-family:
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    Roboto,
    "Helvetica Neue",
    Arial,
    sans-serif;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  line-height: 1.65;
  font-size: 16px;
}

body {
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
  background:
    radial-gradient(
      ellipse 60% 45% at 12% 15%,
      rgba(45, 70, 145, 0.40) 0%,
      transparent 62%
    ),
    radial-gradient(
      ellipse 55% 40% at 90% 20%,
      rgba(115, 65, 170, 0.34) 0%,
      transparent 62%
    ),
    radial-gradient(
      ellipse 55% 38% at 78% 88%,
      rgba(50, 90, 140, 0.24) 0%,
      transparent 62%
    ),
    var(--bg);
}

/* 神经网络背景 canvas —— z-index 0，main/footer 在其上 */
canvas#bg {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}

main {
  max-width: 640px;
  margin: 0 auto;
  padding: 7rem 1.75rem 4rem;
  position: relative;
  z-index: 1;
}

section + section {
  margin-top: 5rem;
}

/* Hero —— 纯白标题（回退渐变） */
.hero h1 {
  font-size: 2.25rem;
  font-weight: 500;
  letter-spacing: -0.025em;
  margin-bottom: 0.6rem;
  color: var(--accent);
}

.hero .tagline {
  color: var(--fg-muted);
  font-size: 1rem;
}

/* Manifesto */
.manifesto p {
  font-size: 1.02rem;
  margin-bottom: 1.15rem;
  color: var(--fg);
}

.manifesto p:last-child {
  margin-bottom: 0;
  color: var(--fg-muted);
}

/* Projects */
.projects h2 {
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--fg-muted);
  margin-bottom: 1.5rem;
}

.project-list {
  list-style: none;
  margin: 0 -1rem;
}

.project-list li {
  border-top: 1px solid var(--border);
  position: relative;
}

.project-list li:last-child {
  border-bottom: 1px solid var(--border);
}

.project,
.placeholder {
  display: block;
  color: var(--fg);
  text-decoration: none;
  position: relative;
  padding: 1.1rem 1rem;
  border-radius: 6px;
  transition: background-color 0.25s ease;
}

/* hover —— 极淡底色 + 左侧银白竖条（贴 li 左边，距文字更远） */
.project::before {
  content: "";
  position: absolute;
  left: 0.1rem;
  top: 22%;
  bottom: 22%;
  width: 2px;
  background: linear-gradient(
    180deg,
    transparent 0%,
    #ffffff 30%,
    #ffffff 70%,
    transparent 100%
  );
  opacity: 0;
  transition: opacity 0.28s ease;
  border-radius: 2px;
  pointer-events: none;
}

.project:hover {
  background-color: rgba(255, 255, 255, 0.035);
}

.project:hover::before {
  opacity: 1;
}

.project:hover .name {
  color: #ffffff;
}

.project .name {
  color: var(--accent);
  font-weight: 500;
  margin-right: 0.4rem;
  transition: color 0.25s ease;
}

.project .dash {
  color: var(--fg-dim);
  margin-right: 0.4rem;
}

.project .desc {
  color: var(--fg-muted);
}

.placeholder {
  color: var(--fg-dim);
  font-size: 0.95rem;
  cursor: default;
}

.placeholder .dot {
  margin-right: 0.5rem;
}

/* Footer */
footer {
  max-width: 640px;
  margin: 0 auto;
  padding: 3rem 1.75rem 2.5rem;
  color: #797985; /* WCAG AA 4.6:1 on #0a0a0a */
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  position: relative;
  z-index: 1;
}

/* Responsive */
@media (max-width: 480px) {
  main {
    padding: 4rem 1.25rem 3rem;
  }

  section + section {
    margin-top: 3.5rem;
  }

  .hero h1 {
    font-size: 1.85rem;
  }

  .manifesto p {
    font-size: 0.98rem;
  }

  footer {
    padding: 2rem 1.25rem 2rem;
  }
}

/* 尊重系统的减少动画偏好 */
@media (prefers-reduced-motion: reduce) {
  .project,
  .placeholder {
    transition: none;
  }
}