:root {
  --bg: #0a0e14;
  --bg2: #0d131c;
  --card: #111826;
  --border: #1e2a3a;
  --text: #e6edf3;
  --dim: #8b98a9;
  --go: #00ADD8;
  --green: #3fb950;
  --yellow: #d29922;
  --red: #f85149;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.7;
  overflow-x: hidden;
}

.bg-grid {
  position: fixed; inset: 0; z-index: -2;
  background-image:
    linear-gradient(rgba(0,173,216,.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,173,216,.045) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: radial-gradient(ellipse 90% 70% at 50% 0%, black 30%, transparent 100%);
}
.cursor-glow {
  position: fixed; width: 520px; height: 520px; z-index: -1;
  border-radius: 50%; pointer-events: none;
  background: radial-gradient(circle, rgba(0,173,216,.08), transparent 65%);
  transform: translate(-50%, -50%);
  transition: opacity .3s;
}

/* Nav */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 50;
  display: flex; justify-content: space-between; align-items: center;
  padding: 16px 32px;
  background: rgba(10,14,20,.75); backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.logo { color: var(--text); text-decoration: none; font-family: var(--mono); font-weight: 700; font-size: 17px; }
.logo .prompt { color: var(--green); margin-right: 6px; }
.logo .caret { color: var(--go); animation: blink 1.1s steps(1) infinite; }
.nav nav a {
  color: var(--dim); text-decoration: none; margin-left: 26px; font-size: 14px;
  transition: color .2s;
}
.nav nav a:hover { color: var(--go); }

/* Layout */
main { max-width: 920px; margin: 0 auto; padding: 130px 24px 40px; }
.section { margin: 110px 0; }
.sec-title { font-size: 24px; margin-bottom: 36px; font-weight: 700; }
.sec-title .num { font-family: var(--mono); color: var(--go); font-size: 16px; margin-right: 10px; }
.sec-title .dash { color: var(--dim); margin: 0 8px; font-weight: 400; }
.sec-title .en { font-family: var(--mono); color: var(--dim); font-size: 15px; font-weight: 400; }

/* Hero */
.hero { min-height: 62vh; display: flex; flex-direction: column; justify-content: center; }
.terminal {
  background: var(--bg2); border: 1px solid var(--border); border-radius: 12px;
  overflow: hidden; box-shadow: 0 24px 70px rgba(0,0,0,.5), 0 0 0 1px rgba(0,173,216,.06);
  max-width: 640px;
}
.term-bar {
  display: flex; align-items: center; gap: 8px;
  padding: 12px 16px; background: #131b28; border-bottom: 1px solid var(--border);
}
.dot { width: 12px; height: 12px; border-radius: 50%; }
.dot.r { background: var(--red); } .dot.y { background: var(--yellow); } .dot.g { background: var(--green); }
.term-title { margin-left: 8px; font-family: var(--mono); font-size: 12px; color: var(--dim); }
.term-body { padding: 22px 24px; font-family: var(--mono); font-size: 15px; }
.term-body .line { margin: 8px 0; }
.term-body .prompt { color: var(--green); margin-right: 10px; }
.term-body .cmd { color: var(--text); }
.term-body .out { color: var(--dim); padding-left: 4px; }
.term-body .out.accent { color: var(--go); font-weight: 700; font-size: 19px; }
.terminal.small { max-width: 560px; }
.blink { animation: blink 1s steps(1) infinite; color: var(--go); }
@keyframes blink { 50% { opacity: 0; } }

.hero-sub { margin: 34px 0 28px; font-size: 18px; color: var(--dim); max-width: 560px; }
.hero-links { display: flex; gap: 14px; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 26px; border-radius: 10px; font-size: 15px; font-weight: 600;
  text-decoration: none; color: var(--text);
  border: 1px solid var(--border); background: var(--card);
  transition: transform .15s, border-color .2s, box-shadow .2s;
}
.btn:hover { transform: translateY(-2px); border-color: var(--go); box-shadow: 0 8px 28px rgba(0,173,216,.18); }
.btn.primary { background: var(--go); border-color: var(--go); color: #06121a; }
.btn.primary:hover { box-shadow: 0 8px 32px rgba(0,173,216,.4); }

/* About */
.about-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 16px; }
.about-card {
  background: var(--card); border: 1px solid var(--border); border-radius: 12px;
  padding: 22px; transition: transform .15s, border-color .2s;
}
.about-card:hover { transform: translateY(-3px); border-color: var(--go); }
.about-card h3 { font-size: 15px; margin-bottom: 10px; color: var(--go); }
.about-card p { font-size: 14px; color: var(--text); }
.dim { color: var(--dim); font-size: 13px; }

/* Projects */
.proj-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(340px, 1fr)); gap: 16px; }
.proj {
  display: block; background: var(--card); border: 1px solid var(--border);
  border-radius: 12px; padding: 24px; text-decoration: none; color: var(--text);
  transition: transform .15s, border-color .2s, box-shadow .2s;
}
.proj:hover { transform: translateY(-4px); border-color: var(--go); box-shadow: 0 14px 40px rgba(0,173,216,.12); }
.proj-top { display: flex; justify-content: space-between; align-items: center; margin-bottom: 12px; }
.proj-name { font-family: var(--mono); font-weight: 700; font-size: 16px; color: var(--go); }
.proj-lang {
  font-family: var(--mono); font-size: 11px; padding: 3px 10px; border-radius: 20px;
  background: rgba(0,173,216,.12); color: var(--go); border: 1px solid rgba(0,173,216,.3);
}
.proj p { font-size: 14px; color: var(--dim); margin-bottom: 14px; }
.proj-link { font-family: var(--mono); font-size: 13px; color: var(--text); }

/* Stack */
.stack { display: flex; flex-wrap: wrap; gap: 12px; }
.tag {
  font-family: var(--mono); font-size: 14px; padding: 9px 20px; border-radius: 24px;
  background: var(--card); border: 1px solid var(--border); color: var(--text);
  transition: border-color .2s, transform .15s;
}
.tag:hover { border-color: var(--go); transform: translateY(-2px); }
.tag.hot { border-color: var(--go); color: var(--go); background: rgba(0,173,216,.08); }
.stack-note { margin-top: 22px; }

/* Footer */
footer {
  text-align: center; padding: 50px 20px 40px;
  border-top: 1px solid var(--border); color: var(--dim); font-size: 13px;
}
footer p { margin: 4px 0; }

/* Reveal animation */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity .7s ease, transform .7s ease; }
.reveal.visible { opacity: 1; transform: none; }

@media (max-width: 640px) {
  .nav { padding: 14px 18px; }
  .nav nav a { margin-left: 16px; }
  main { padding: 110px 18px 30px; }
  .proj-grid { grid-template-columns: 1fr; }
}