:root {
  --bg: #0b0f17;
  --bg-card: #111827;
  --bg-card-hover: #16213a;
  --text: #e5e9f0;
  --text-dim: #8b95a7;
  --accent: #38bdf8;
  --accent-2: #a78bfa;
  --border: #1f2b3f;
  --maxw: 1080px;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: "PingFang SC", "Microsoft YaHei", "Segoe UI", system-ui, sans-serif;
  line-height: 1.7;
  overflow-x: hidden;
}

#bg-canvas {
  position: fixed;
  inset: 0;
  z-index: 0;
  opacity: 0.55;
}

.site-header, main, .site-footer {
  position: relative;
  z-index: 1;
}

/* Header */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 32px;
  background: rgba(11, 15, 23, 0.75);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  z-index: 10;
}

.logo {
  font-size: 18px;
  font-weight: 700;
  color: var(--text);
  text-decoration: none;
  letter-spacing: 2px;
}

.nav { display: flex; gap: 24px; }

.nav a {
  color: var(--text-dim);
  text-decoration: none;
  font-size: 14px;
  transition: color 0.2s;
}

.nav a:hover { color: var(--accent); }

/* Hero */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 80px 24px 60px;
  position: relative;
}

.hero-inner { max-width: var(--maxw); }

.hero-kicker {
  color: var(--accent);
  font-family: Consolas, "Courier New", monospace;
  font-size: 15px;
  margin-bottom: 12px;
}

.hero-title {
  font-size: clamp(44px, 9vw, 88px);
  font-weight: 800;
  line-height: 1.1;
  background: linear-gradient(120deg, var(--text) 30%, var(--accent) 70%, var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 16px;
}

.hero-roles {
  font-family: Consolas, "Courier New", monospace;
  font-size: clamp(18px, 3.4vw, 28px);
  color: var(--accent-2);
  min-height: 1.6em;
  margin-bottom: 20px;
}

.caret {
  animation: blink 1s step-end infinite;
  color: var(--accent);
}

@keyframes blink { 50% { opacity: 0; } }

.hero-desc {
  max-width: 560px;
  color: var(--text-dim);
  font-size: 17px;
  margin-bottom: 36px;
}

.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }

.btn {
  display: inline-block;
  padding: 13px 30px;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  transition: transform 0.2s, box-shadow 0.2s, background 0.2s;
}

.btn-primary {
  background: linear-gradient(120deg, var(--accent), var(--accent-2));
  color: #08101c;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(56, 189, 248, 0.35);
}

.btn-ghost {
  border: 1px solid var(--accent);
  color: var(--accent);
}

.btn-ghost:hover {
  background: rgba(56, 189, 248, 0.1);
  transform: translateY(-2px);
}

.scroll-hint {
  position: absolute;
  bottom: 28px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 12px;
  letter-spacing: 3px;
  color: var(--text-dim);
  animation: float 2.4s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translate(-50%, 0); }
  50% { transform: translate(-50%, 8px); }
}

/* Sections */
.section {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 96px 24px 40px;
}

.section-title {
  display: flex;
  align-items: center;
  gap: 14px;
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 48px;
}

.section-title::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--border);
}

.title-index {
  color: var(--accent);
  font-family: Consolas, monospace;
  font-size: 18px;
}

/* Projects */
.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
}

.project-card {
  display: flex;
  flex-direction: column;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 28px;
  text-decoration: none;
  color: var(--text);
  transition: transform 0.25s, border-color 0.25s, background 0.25s;
}

.project-card:hover {
  transform: translateY(-6px);
  border-color: var(--accent);
  background: var(--bg-card-hover);
}

.card-icon { font-size: 34px; margin-bottom: 16px; }

.project-card h3 {
  font-size: 19px;
  margin-bottom: 10px;
}

.project-card p {
  color: var(--text-dim);
  font-size: 14.5px;
  flex: 1;
  margin-bottom: 16px;
}

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
}

.card-tags span {
  font-family: Consolas, monospace;
  font-size: 12px;
  color: var(--accent);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 3px 12px;
}

.card-link {
  font-size: 13.5px;
  color: var(--accent-2);
  font-family: Consolas, monospace;
}

/* About */
.about-wrap {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 48px;
}

.about-text p { color: var(--text-dim); margin-bottom: 16px; }

.skill-list { list-style: none; }

.skill-list li {
  border-left: 2px solid var(--accent);
  padding: 10px 16px;
  margin-bottom: 12px;
  background: var(--bg-card);
  border-radius: 0 8px 8px 0;
  font-size: 14.5px;
  color: var(--text-dim);
}

.skill-list strong {
  display: block;
  color: var(--text);
  font-size: 15px;
  margin-bottom: 2px;
}

/* Contact */
.contact-wrap {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 48px;
  align-items: start;
}

.contact-links {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.contact-item {
  display: grid;
  grid-template-columns: 40px auto 1fr;
  align-items: center;
  gap: 14px;
  padding: 18px 22px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  text-decoration: none;
  transition: border-color 0.2s, transform 0.2s;
}

.contact-item:hover {
  border-color: var(--accent);
  transform: translateX(6px);
}

.contact-icon { font-size: 20px; color: var(--accent); }
.contact-label { font-weight: 600; color: var(--text); }
.contact-value {
  font-family: Consolas, monospace;
  font-size: 13px;
  color: var(--text-dim);
  text-align: right;
}

.wechat-card {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  padding: 20px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 14px;
}

.wechat-qr {
  width: 160px;
  height: auto;
  border-radius: 8px;
  display: block;
}

.wechat-tip {
  font-size: 13.5px;
  color: var(--text-dim);
}

/* Footer */
.site-footer {
  text-align: center;
  padding: 40px 24px;
  color: var(--text-dim);
  font-size: 13.5px;
  border-top: 1px solid var(--border);
  margin-top: 60px;
}

/* Mobile */
@media (max-width: 768px) {
  .site-header { padding: 12px 18px; }
  .nav { gap: 16px; }
  .section { padding: 72px 18px 24px; }
  .about-wrap { grid-template-columns: 1fr; gap: 28px; }
  .contact-wrap { grid-template-columns: 1fr; gap: 32px; justify-items: start; }
  .contact-item { grid-template-columns: 32px 1fr; }
  .contact-value { grid-column: 2; text-align: left; }
}