/* ============================================================
   路人甲_PasserbyA · 个人站点
   配色：纯黑白灰
   风格：扁平化 —— 无渐变、无阴影、无模糊、无位移动效
   ============================================================ */

:root {
  --bg:         #0f0f0f;
  --surface:    #1a1a1a;
  --surface-hi: #242424;
  --border:     #333333;
  --text:       #ededed;
  --muted:      #9a9a9a;

  --solid:      #ededed;   /* 实心块填充 */
  --solid-text: #0f0f0f;   /* 实心块上的文字 */

  --radius: 4px;           /* 想更硬朗就改成 0 */
  --maxw:   940px;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg:         #ffffff;
    --surface:    #f7f7f7;
    --surface-hi: #ededed;
    --border:     #d9d9d9;
    --text:       #111111;
    --muted:      #666666;

    --solid:      #111111;
    --solid-text: #ffffff;
  }
}

*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI",
               "Microsoft YaHei", "PingFang SC", "Hiragino Sans GB",
               "Noto Sans SC", Roboto, sans-serif;
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; border-bottom: 1px solid var(--border); }
a:hover { border-bottom-color: var(--text); }

:focus-visible { outline: 2px solid var(--text); outline-offset: 2px; }

code {
  font-family: "Cascadia Code", Consolas, "JetBrains Mono", monospace;
  font-size: .88em;
  background: var(--surface-hi);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: .08em .34em;
}

.wrap { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 22px; }

/* ---------------- 顶部导航 ---------------- */
.nav {
  position: sticky; top: 0; z-index: 20;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px; min-height: 60px;
}
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 600; border: 0; }
.brand:hover { border: 0; }
.brand-mark {
  display: grid; place-items: center;
  width: 28px; height: 28px; border-radius: var(--radius);
  background: var(--solid); color: var(--solid-text);
  font-weight: 700; font-size: 14px;
}
.brand-text { font-size: 15px; }
.nav-links { display: flex; gap: 22px; }
.nav-links a { color: var(--muted); font-size: 14.5px; border: 0; }
.nav-links a:hover { color: var(--text); border: 0; }

/* ---------------- Hero ---------------- */
.hero { padding: 76px 22px 60px; }
.eyebrow { margin: 0 0 10px; color: var(--muted); font-size: 14px; }
.hero h1 {
  margin: 0 0 14px;
  font-size: clamp(2rem, 5.5vw, 2.9rem);
  line-height: 1.15; letter-spacing: -.02em; font-weight: 700;
}
.lede { margin: 0 0 26px; max-width: 40em; font-size: 1.04rem; color: var(--muted); }
.lede strong { color: var(--text); font-weight: 600; }

.actions { display: flex; flex-wrap: wrap; gap: 10px; }
.btn {
  display: inline-block; padding: 9px 18px; border-radius: var(--radius);
  border: 1px solid var(--border); background: transparent;
  color: var(--text); font-size: 15px; font-weight: 500;
}
.btn:hover { border-color: var(--text); }
.btn-primary {
  background: var(--solid); border-color: var(--solid); color: var(--solid-text);
}

/* ---------------- 区块 ---------------- */
.section { padding: 44px 22px; }
.section h2 {
  margin: 0 0 22px; font-size: 1.35rem; font-weight: 700;
  padding-bottom: 12px; border-bottom: 1px solid var(--border);
}
.prose p { margin: 0 0 14px; }
.prose p:last-child { margin-bottom: 0; }

/* ---------------- 关于：两栏 ---------------- */
.cols { display: grid; grid-template-columns: 1.55fr 1fr; gap: 32px; align-items: start; }

.facts {
  margin: 0; padding: 16px 18px;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius);
}
.facts > div { display: flex; gap: 12px; padding: 7px 0; }
.facts > div + div { border-top: 1px solid var(--border); }
.facts dt { flex: 0 0 44px; color: var(--muted); font-size: 14px; }
.facts dd { margin: 0; font-size: 14.5px; }

/* ---------------- 项目卡片 ---------------- */
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 16px; }
.grid-tight { grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); }

.card {
  display: flex; flex-direction: column;
  padding: 20px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.card:hover { border-color: var(--muted); }
.card-featured { border-color: var(--text); }

.card-head { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin-bottom: 10px; }
.card-head h3 { margin: 0; font-size: 1.08rem; font-weight: 700; }
.card p { margin: 0 0 16px; font-size: 14.5px; color: var(--muted); }
.card p code { color: var(--text); }

.tag {
  font-size: 11.5px; padding: 2px 9px; border-radius: var(--radius);
  border: 1px solid var(--border); color: var(--muted); white-space: nowrap;
}
.tag-accent {
  background: var(--solid); border-color: var(--solid); color: var(--solid-text);
}

.chips { display: flex; flex-wrap: wrap; gap: 6px; list-style: none; margin: 0 0 18px; padding: 0; }
.chips li {
  font-size: 12.5px; padding: 3px 10px; border-radius: var(--radius);
  background: var(--surface-hi); border: 1px solid var(--border); color: var(--muted);
}
.card-actions { display: flex; flex-wrap: wrap; gap: 18px; margin-top: auto; }
.card-link { font-size: 14.5px; font-weight: 500; border: 0; }
.card-link:hover { border: 0; text-decoration: underline; }

/* ---------------- 技术栈卡 ---------------- */
.stack-card {
  padding: 16px 18px; background: var(--surface);
  border: 1px solid var(--border); border-radius: var(--radius);
}
.stack-card h4 {
  margin: 0 0 12px; font-size: 14px; color: var(--muted);
  font-weight: 600; letter-spacing: .3px;
}
.stack-card .chips { margin-bottom: 0; }

/* ---------------- 联系 ---------------- */
.contact-list { list-style: none; margin: 0; padding: 0; }
.contact-list li {
  display: flex; align-items: baseline; gap: 16px;
  padding: 12px 0; border-bottom: 1px solid var(--border);
}
.contact-list li:first-child { border-top: 1px solid var(--border); }
.contact-key { flex: 0 0 66px; color: var(--muted); font-size: 14px; }

/* ---------------- 页脚 ---------------- */
.footer {
  margin-top: 32px; padding: 24px 0 32px;
  border-top: 1px solid var(--border);
  color: var(--muted); font-size: 13.5px;
}
.footer p { margin: 0; }

/* ---------------- 响应式 ---------------- */
@media (max-width: 720px) {
  .cols { grid-template-columns: 1fr; gap: 24px; }
  .nav-links { gap: 16px; }
  .nav-links a { font-size: 14px; }
  .brand-text { display: none; }
  .hero { padding: 52px 22px 42px; }
  .section { padding: 34px 22px; }
}

/* ---------------- 无障碍 ---------------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

/* ---------------- 打印 ---------------- */
@media print {
  .nav, .actions, .footer { display: none; }
  body { background: #fff; color: #000; }
  .card, .facts, .stack-card { border-color: #999; }
}
/* ============================================================
   子页：项目详情
   ============================================================ */

.page-head { padding: 50px 22px 32px; border-bottom: 1px solid var(--border); }
.page-head h1 { margin: 0 0 12px; font-size: clamp(1.8rem, 5vw, 2.5rem); letter-spacing: -.02em; font-weight: 700; }
.page-head .lede { margin-bottom: 22px; }

.back { display: inline-block; margin-bottom: 16px; color: var(--muted); font-size: 14px; border: 0; }
.back:hover { color: var(--text); border: 0; }

.meta-row { display: flex; flex-wrap: wrap; gap: 8px 22px; color: var(--muted); font-size: 14px; }
.meta-row b { color: var(--text); font-weight: 600; margin-right: 6px; }
.page-head .actions { margin-top: 22px; }
.page-head .actions .btn { margin: 0; }

.feature-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(258px, 1fr)); gap: 16px; }
.feature {
  padding: 18px; background: var(--surface);
  border: 1px solid var(--border); border-radius: var(--radius);
}
.feature h3 { margin: 0 0 8px; font-size: 1rem; font-weight: 700; }
.feature p { margin: 0; font-size: 14.5px; color: var(--muted); }
.feature p + p { margin-top: 8px; }

.codeblock {
  margin: 0 0 16px; padding: 16px 18px; overflow-x: auto;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius);
  font-family: "Cascadia Code", Consolas, "JetBrains Mono", monospace;
  font-size: 13.5px; line-height: 1.7; color: var(--text);
}
.codeblock code { background: none; border: 0; padding: 0; font-size: inherit; }

.shot-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(276px, 1fr)); gap: 16px; }
.shot {
  display: grid; place-items: center; min-height: 168px; padding: 18px;
  background: var(--surface); border: 1px dashed var(--border);
  border-radius: var(--radius); color: var(--muted); font-size: 13.5px; text-align: center;
}

.steps { list-style: none; margin: 0; padding: 0; counter-reset: s; }
.steps li { position: relative; padding: 0 0 14px 34px; color: var(--muted); font-size: 15px; }
.steps li::before {
  counter-increment: s; content: counter(s);
  position: absolute; left: 0; top: 3px;
  width: 22px; height: 22px; display: grid; place-items: center;
  background: var(--solid); color: var(--solid-text);
  border-radius: var(--radius); font-size: 12px; font-weight: 700;
}
.steps li b { color: var(--text); }
.steps li:last-child { padding-bottom: 0; }

@media print {
  .back, .codeblock, .shot { border-color: #999; }
}