/* 对齐 aboutme.lyz1010.site 主页风格：浅色蓝调 + Sora / Noto Sans SC */
@import url('https://fonts.googleapis.com/css2?family=Sora:wght@400;600;700;800&family=Noto+Sans+SC:wght@400;500;700&display=swap');

:root {
  --bg: #ffffff;
  --bg-soft: #f2f7ff;
  --bg-card: #f8fafc;
  --border: #e2e8f0;
  --border-soft: #dbeafe;
  --text: #0f172a;
  --text-dim: #64748b;
  --accent: #2563eb;
  --accent-2: #3080ff;
  --cyan: #00d2ef;
  --accent-soft: rgba(37, 99, 235, 0.08);
  --green: #0ea5a4;
  --purple: #7c3aed;
  --radius: 16px;
  --maxw: 920px;
  --font-title: "Sora", "Noto Sans SC", ui-sans-serif, system-ui, sans-serif;
  --font-body: "Noto Sans SC", "Sora", -apple-system, BlinkMacSystemFont, "PingFang SC", sans-serif;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  background:
    radial-gradient(1200px 500px at 80% -10%, #eaf2ff 0%, rgba(234,242,255,0) 60%),
    radial-gradient(900px 400px at 0% 0%, #f2f7ff 0%, rgba(242,247,255,0) 55%),
    var(--bg);
  color: var(--text);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, .brand { font-family: var(--font-title); }

a { color: var(--accent); text-decoration: none; transition: opacity .2s, color .2s; }
a:hover { opacity: .82; }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

/* ---------- top nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255, 255, 255, 0.78);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.nav .wrap { display: flex; align-items: center; justify-content: space-between; height: 60px; }
.nav .brand { font-weight: 700; font-size: 16px; color: var(--text); letter-spacing: .2px; }
.nav .links a { margin-left: 22px; font-size: 14px; color: var(--text-dim); font-family: var(--font-title); }
.nav .links a:hover { color: var(--accent); opacity: 1; }

/* ---------- hero ---------- */
.hero { padding: 76px 0 44px; }
.hero h1 {
  font-size: 42px; line-height: 1.18; font-weight: 800; letter-spacing: -.6px;
  background: linear-gradient(120deg, #0f172a 0%, #2563eb 60%, #00d2ef 100%);
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
.hero .sub { margin-top: 16px; font-size: 18px; color: var(--text-dim); max-width: 680px; }
.hero .tags { margin-top: 24px; display: flex; flex-wrap: wrap; gap: 10px; }
.tag {
  font-size: 13px; padding: 6px 14px; border-radius: 999px;
  background: var(--accent-soft); color: var(--accent);
  border: 1px solid var(--border-soft); font-weight: 500;
}

/* ---------- section ---------- */
.section { padding: 44px 0; border-top: 1px solid var(--border); }
.section h2 { font-size: 13px; text-transform: uppercase; letter-spacing: 1.8px; color: var(--accent); margin-bottom: 26px; font-weight: 700; }

/* ---------- project cards (index) ---------- */
.cards { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
@media (max-width: 680px) { .cards { grid-template-columns: 1fr; } }
.card {
  display: block; background: #fff; border: 1px solid var(--border);
  border-radius: var(--radius); padding: 26px;
  transition: border-color .2s, transform .2s, box-shadow .2s;
  box-shadow: 0 1px 2px rgba(15,23,42,.04);
}
.card:hover { border-color: var(--accent); transform: translateY(-4px); opacity: 1; box-shadow: 0 12px 28px rgba(37,99,235,.12); }
.card .k { font-size: 12px; color: var(--accent); font-weight: 700; letter-spacing: .4px; font-family: var(--font-title); }
.card h3 { font-size: 20px; margin: 9px 0 10px; color: var(--text); font-weight: 700; }
.card p { font-size: 14px; color: var(--text-dim); }
.card .meta { margin-top: 15px; font-size: 12.5px; color: var(--text-dim); display: flex; gap: 8px; flex-wrap: wrap; }
.card .meta span { background: var(--bg-soft); padding: 4px 10px; border-radius: 7px; border: 1px solid var(--border-soft); color: var(--accent); }

/* ---------- project detail ---------- */
.back { display: inline-block; margin: 30px 0 8px; font-size: 14px; color: var(--text-dim); font-family: var(--font-title); }
.phead { padding: 22px 0 34px; }
.phead .k { font-size: 13px; color: var(--accent); font-weight: 700; font-family: var(--font-title); }
.phead h1 { font-size: 34px; margin: 11px 0 14px; letter-spacing: -.4px; font-weight: 800; }
.phead .lead { font-size: 17px; color: var(--text-dim); max-width: 720px; }
.phead .metaline { margin-top: 20px; font-size: 13px; color: var(--text-dim); display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }
.chip { background: var(--accent-soft); color: var(--accent); border: 1px solid var(--border-soft); padding: 5px 12px; border-radius: 999px; font-size: 12.5px; font-weight: 500; }
.chip.g { background: rgba(14,165,164,.1); color: var(--green); border-color: rgba(14,165,164,.25); }
.chip.p { background: rgba(124,58,237,.09); color: var(--purple); border-color: rgba(124,58,237,.22); }

.block { margin: 32px 0; }
.block h2 { font-size: 21px; margin-bottom: 14px; color: var(--text); font-weight: 700; }
.block h3 { font-size: 16px; margin: 22px 0 8px; color: var(--accent); font-weight: 600; }
.block p { color: var(--text-dim); margin-bottom: 12px; }
.block ul { list-style: none; }
.block li { position: relative; padding-left: 22px; margin-bottom: 11px; color: var(--text-dim); }
.block li::before { content: "▹"; position: absolute; left: 0; color: var(--accent); }
.block li strong { color: var(--text); font-weight: 600; }

.highlight {
  background: linear-gradient(135deg, #f2f7ff 0%, #f8fafc 100%);
  border: 1px solid var(--border-soft);
  border-left: 3px solid var(--accent); border-radius: 10px;
  padding: 16px 20px; margin: 22px 0; color: var(--text-dim); font-size: 15px;
}
.highlight strong { color: var(--text); }

.metrics { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 14px; margin: 22px 0; }
.metric { background: #fff; border: 1px solid var(--border); border-radius: 12px; padding: 20px; text-align: center; box-shadow: 0 1px 2px rgba(15,23,42,.04); }
.metric .num { font-size: 27px; font-weight: 800; font-family: var(--font-title);
  background: linear-gradient(120deg, #2563eb, #00d2ef); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
.metric .lbl { font-size: 12.5px; color: var(--text-dim); margin-top: 5px; }

.stack { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }
.stack span { font-size: 12.5px; padding: 5px 12px; border-radius: 7px; background: var(--bg-soft); border: 1px solid var(--border-soft); color: var(--accent); }

/* ---------- diagram (loop) ---------- */
.loop { background: linear-gradient(135deg, #f2f7ff 0%, #ffffff 100%); border: 1px solid var(--border-soft); border-radius: var(--radius); padding: 30px; margin: 24px 0; }
.loop-row { display: flex; align-items: center; justify-content: center; flex-wrap: wrap; gap: 12px; }
.loop-node { background: #fff; border: 1px solid var(--border); border-radius: 12px; padding: 13px 18px; font-size: 14px; color: var(--text); text-align: center; min-width: 130px; box-shadow: 0 2px 6px rgba(37,99,235,.06); }
.loop-node small { color: var(--text-dim); }
.loop-node.acc { border-color: var(--accent); color: var(--accent); }
.loop-node.acc small { color: var(--accent-2); }
.loop-node.grn { border-color: var(--green); color: var(--green); }
.loop-arrow { color: var(--accent); font-size: 20px; font-weight: 700; }

/* ---------- footer ---------- */
.footer { border-top: 1px solid var(--border); padding: 32px 0 54px; margin-top: 44px; text-align: center; color: var(--text-dim); font-size: 13px; }
.footer a { margin: 0 8px; }