/* amzyeung.com — 个人品牌 + 文章 · 移动优先 · 中文为主 */
:root {
  --bg: #f7f5f1;
  --surface: #ffffff;
  --ink: #1a1a1a;
  --muted: #5c5c5c;
  --line: #e4e0d8;
  --accent: #1e4d3a;
  --accent-soft: #e8f0eb;
  --cta: #c45c26;
  --max: 720px;
  --wide: 960px;
  --radius: 10px;
  --shadow: 0 1px 2px rgba(0,0,0,.04), 0 8px 24px rgba(0,0,0,.04);
  --font: "IBM Plex Sans", "Noto Sans SC", "PingFang SC", "Microsoft YaHei",
    "Segoe UI", system-ui, -apple-system, sans-serif;
  --serif: "Source Serif 4", "Noto Serif SC", "Songti SC", "Georgia", serif;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font);
  font-size: 1.05rem;
  line-height: 1.75;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; }
a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--cta); }
.wrap { width: min(100% - 2rem, var(--wide)); margin-inline: auto; }
.narrow { width: min(100% - 2rem, var(--max)); margin-inline: auto; }

.site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 20;
}
.site-header .inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: .85rem 0;
  width: min(100% - 2rem, var(--wide));
  margin-inline: auto;
}
.brand {
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--ink);
  text-decoration: none;
  letter-spacing: -.01em;
}
.brand span { color: var(--accent); font-weight: 500; }
.nav { display: flex; flex-wrap: wrap; gap: .15rem .9rem; align-items: center; }
.nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: .95rem;
  font-weight: 500;
}
.nav a:hover, .nav a[aria-current="page"] { color: var(--accent); }

.hero { padding: 3rem 0 2.25rem; }
.hero .eyebrow {
  display: inline-block;
  font-size: .8rem;
  font-weight: 600;
  letter-spacing: .04em;
  color: var(--accent);
  background: var(--accent-soft);
  padding: .3rem .65rem;
  border-radius: 999px;
  margin-bottom: 1rem;
}
.hero h1 {
  font-family: var(--serif);
  font-size: clamp(1.75rem, 4.5vw, 2.45rem);
  line-height: 1.3;
  letter-spacing: -.01em;
  margin: 0 0 .65rem;
  font-weight: 600;
}
.hero .en-tag {
  font-size: .95rem;
  color: var(--muted);
  margin: 0 0 1.1rem;
  font-style: italic;
}
.hero .lede {
  font-size: 1.1rem;
  color: var(--muted);
  max-width: 40rem;
  margin: 0 0 1.5rem;
}
.cta-row { display: flex; flex-wrap: wrap; gap: .75rem; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .4rem;
  padding: .7rem 1.15rem;
  border-radius: 8px;
  font-weight: 600;
  font-size: .95rem;
  text-decoration: none;
  border: 1px solid transparent;
  transition: background .15s, color .15s, border-color .15s;
}
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: #163a2c; color: #fff; }
.btn-secondary {
  background: var(--surface);
  color: var(--ink);
  border-color: var(--line);
}
.btn-secondary:hover { border-color: var(--accent); color: var(--accent); }
.btn-soft {
  background: transparent;
  color: var(--muted);
  border-color: var(--line);
  font-weight: 500;
}
.btn-soft:hover { color: var(--cta); border-color: var(--cta); }

.section { padding: 2.25rem 0; }
.section-title {
  font-family: var(--serif);
  font-size: 1.4rem;
  margin: 0 0 1rem;
}
.section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}
.section-head a { font-size: .9rem; font-weight: 600; text-decoration: none; }

.card-grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: 1fr;
}
@media (min-width: 720px) {
  .card-grid { grid-template-columns: repeat(3, 1fr); }
  .card-grid.two { grid-template-columns: repeat(2, 1fr); }
}
.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.25rem;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  gap: .5rem;
}
.card a.title {
  font-family: var(--serif);
  font-size: 1.08rem;
  font-weight: 600;
  color: var(--ink);
  text-decoration: none;
  line-height: 1.4;
}
.card a.title:hover { color: var(--accent); }
.card .meta { font-size: .8rem; color: var(--muted); }
.card p { margin: 0; color: var(--muted); font-size: .95rem; flex: 1; }
.card .more {
  font-size: .9rem;
  font-weight: 600;
  text-decoration: none;
  margin-top: .35rem;
}
.pill {
  display: inline-block;
  font-size: .72rem;
  font-weight: 600;
  letter-spacing: .02em;
  color: var(--accent);
  background: var(--accent-soft);
  padding: .2rem .5rem;
  border-radius: 4px;
  width: fit-content;
}
.pill.soon { color: var(--muted); background: #eeebe6; }
.en-line {
  display: block;
  font-size: .85rem;
  color: var(--muted);
  font-weight: 400;
  margin-top: .25rem;
  font-style: italic;
}

.callout {
  background: var(--surface);
  border: 1px solid var(--line);
  border-left: 4px solid var(--cta);
  border-radius: var(--radius);
  padding: 1.25rem 1.4rem;
  margin: 1.5rem 0;
}
.callout h3 { margin: 0 0 .4rem; font-size: 1.05rem; }
.callout p { margin: 0; color: var(--muted); font-size: .95rem; }
.callout a { font-weight: 600; }

.article-list { list-style: none; padding: 0; margin: 0; }
.article-list li {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.15rem 1.25rem;
  margin-bottom: .75rem;
}
.article-list h2 {
  font-family: var(--serif);
  font-size: 1.15rem;
  margin: .35rem 0 .35rem;
  line-height: 1.4;
}
.article-list h2 a { color: var(--ink); text-decoration: none; }
.article-list h2 a:hover { color: var(--accent); }
.article-list .meta { font-size: .8rem; color: var(--muted); }
.article-list p { margin: .4rem 0 0; color: var(--muted); font-size: .95rem; }
.article-list.soon li { opacity: .8; }
.article-list.soon h2 { font-size: 1.02rem; color: var(--muted); }

.prose { padding: 2.5rem 0 3rem; }
.prose .meta { font-size: .85rem; color: var(--muted); margin-bottom: 1.25rem; }
.prose h1 {
  font-family: var(--serif);
  font-size: clamp(1.6rem, 4vw, 2.15rem);
  line-height: 1.3;
  margin: 0 0 .5rem;
}
.prose h2 {
  font-family: var(--serif);
  font-size: 1.3rem;
  margin: 2rem 0 .75rem;
}
.prose h3 { font-size: 1.08rem; margin: 1.5rem 0 .5rem; }
.prose p { margin: 0 0 1.05rem; }
.prose ul, .prose ol { margin: 0 0 1.15rem; padding-left: 1.25rem; }
.prose li { margin-bottom: .4rem; }
.prose li::marker { color: var(--accent); }
.prose blockquote {
  margin: 1.25rem 0;
  padding: .75rem 1rem;
  border-left: 3px solid var(--accent);
  background: var(--accent-soft);
  border-radius: 0 var(--radius) var(--radius) 0;
}
.en-summary {
  background: var(--surface);
  border: 1px dashed var(--line);
  border-radius: var(--radius);
  padding: 1rem 1.15rem;
  margin: 0 0 1.75rem;
  font-size: .95rem;
  color: var(--muted);
}
.en-summary strong { color: var(--ink); display: block; margin-bottom: .35rem; font-size: .8rem; letter-spacing: .04em; text-transform: uppercase; }
.prose .checklist { list-style: none; padding: 0; }
.prose .checklist li {
  position: relative;
  padding: .55rem .75rem .55rem 2.2rem;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  margin-bottom: .45rem;
}
.prose .checklist li::before {
  content: "☐";
  position: absolute;
  left: .7rem;
  color: var(--accent);
}
.note {
  font-size: .9rem;
  color: var(--muted);
  background: #f0ebe3;
  border-radius: 8px;
  padding: .85rem 1rem;
  margin: 1.25rem 0;
}
.page-intro { padding: 2.25rem 0 .5rem; }
.page-intro h1 {
  font-family: var(--serif);
  font-size: clamp(1.65rem, 4vw, 2.15rem);
  margin: 0 0 .5rem;
}
.page-intro p { color: var(--muted); margin: 0; max-width: 38rem; }

.contact-box {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow);
  max-width: 34rem;
}
.contact-box dt {
  font-size: .8rem;
  letter-spacing: .04em;
  color: var(--muted);
  font-weight: 600;
  margin-top: 1rem;
}
.contact-box dt:first-child { margin-top: 0; }
.contact-box dd { margin: .25rem 0 0; }
.contact-box a.email {
  font-size: 1.1rem;
  font-weight: 600;
  text-decoration: none;
}
.mailto-form label {
  display: block;
  font-size: .85rem;
  font-weight: 600;
  margin: .85rem 0 .3rem;
}
.mailto-form input,
.mailto-form textarea,
.mailto-form select {
  width: 100%;
  padding: .65rem .75rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  font: inherit;
  background: #fff;
}
.mailto-form textarea { min-height: 120px; resize: vertical; }
.mailto-form .hint { font-size: .8rem; color: var(--muted); margin-top: .35rem; }

.site-footer {
  border-top: 1px solid var(--line);
  padding: 2rem 0 2.5rem;
  margin-top: 2rem;
  color: var(--muted);
  font-size: .9rem;
}
.site-footer .inner {
  width: min(100% - 2rem, var(--wide));
  margin-inline: auto;
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: space-between;
  align-items: flex-start;
}
.site-footer a { color: var(--muted); text-decoration: none; }
.site-footer a:hover { color: var(--accent); }
.site-footer .fine { font-size: .8rem; max-width: 30rem; line-height: 1.55; }
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}