/* ============================
   李清欢 · 个人博客主题
   Minimal · Serif · Airy
   ============================ */

:root {
  --ink: #1a1a2e;
  --soft-ink: #5a5a7a;
  --muted: #8a8aa0;
  --paper: #faf8f5;
  --card: #ffffff;
  --line: #e8e4de;
  --accent: #c0395a;
  --accent-soft: #fdf2f5;
  --accent-glow: rgba(192, 57, 90, .08);
  --focus: #1a1a2e;
  --radius: 12px;
  --transition: .25s cubic-bezier(.22,1,.36,1);
  color-scheme: light;
}

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

html { scroll-behavior: smooth; font-size: 16px; }

body {
  color: var(--ink);
  background: var(--paper);
  font-family: "Inter", "PingFang SC", "Microsoft YaHei", -apple-system, sans-serif;
  font-size: 1rem;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-underline-offset: 4px; transition: color var(--transition); }
a:focus-visible { outline: 3px solid var(--focus); outline-offset: 4px; border-radius: 4px; }

.skip-link {
  position: fixed; top: 12px; left: 12px; z-index: 100;
  padding: 10px 18px; background: var(--ink); color: #fff;
  border-radius: 8px; font-weight: 600; text-decoration: none;
  transform: translateY(-180%); transition: transform .2s;
}
.skip-link:focus { transform: translateY(0); }

/* Layout */
.container { width: min(1120px, calc(100% - 48px)); margin-inline: auto; }

/* Header */
.site-header {
  min-height: 80px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--line);
}

.brand {
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -.04em;
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 6px;
}
.brand .dot { color: var(--accent); }
.brand .tagline { font-size: .75rem; font-weight: 500; color: var(--muted); letter-spacing: .02em; }

nav { display: flex; gap: 28px; }
nav a {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  text-decoration: none;
  color: var(--soft-ink);
  font-weight: 550;
  font-size: .92rem;
  position: relative;
}
nav a::after {
  content: '';
  position: absolute;
  bottom: 8px; left: 0; right: 0;
  height: 2px;
  background: var(--accent);
  transform: scaleX(0);
  transition: transform var(--transition);
}
nav a:hover { color: var(--ink); }
nav a:hover::after { transform: scaleX(1); }

/* Hero */
.hero {
  min-height: 620px;
  display: grid;
  align-content: center;
  padding: 100px 0 80px;
  position: relative;
}
.hero::before {
  content: '';
  position: absolute;
  top: 0; left: 50%; transform: translateX(-50%);
  width: 100vw;
  height: 100%;
  background: radial-gradient(ellipse 80% 50% at 50% 0%, var(--accent-glow), transparent 70%);
  pointer-events: none;
}

.eyebrow {
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 8px;
}

h1 {
  max-width: 960px;
  margin: 16px 0 24px;
  font-family: "Georgia", "Noto Serif SC", serif;
  font-size: clamp(3.2rem, 7.5vw, 7.2rem);
  font-weight: 500;
  line-height: 1.02;
  letter-spacing: -.055em;
}
h1 .sub { color: var(--soft-ink); font-weight: 400; display: block; font-size: .6em; margin-top: 8px; }

.intro {
  max-width: 640px;
  margin: 0 0 36px;
  color: var(--soft-ink);
  font-size: 1.18rem;
  line-height: 1.8;
}

.button {
  width: fit-content;
  min-height: 50px;
  display: inline-flex;
  align-items: center;
  gap: 14px;
  padding: 12px 28px;
  color: #fff;
  background: var(--ink);
  border-radius: var(--radius);
  text-decoration: none;
  font-weight: 650;
  transition: background var(--transition), transform var(--transition);
}
.button:hover { background: var(--accent); transform: translateY(-2px); }

/* Section */
.section { padding: 100px 0; border-top: 1px solid var(--line); }

.section-heading {
  display: grid;
  grid-template-columns: 72px 1fr;
  align-items: baseline;
  margin-bottom: 52px;
}

.index {
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .16em;
  color: var(--accent);
}

h2 {
  margin: 0;
  font: 500 clamp(2.2rem, 5vw, 4.2rem)/1.08 "Georgia", "Noto Serif SC", serif;
  letter-spacing: -.04em;
}

h2 .subtitle {
  display: block;
  font-size: .32em;
  font-weight: 400;
  color: var(--muted);
  letter-spacing: .04em;
  text-transform: uppercase;
  margin-top: 6px;
  font-family: "Inter", sans-serif;
}

/* Stats / Highlight Row */
.stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-bottom: 64px;
}
.stat-card {
  padding: 28px 24px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}
.stat-number {
  font: 700 clamp(2rem, 4vw, 3.2rem)/1 "Inter", sans-serif;
  color: var(--accent);
  letter-spacing: -.03em;
}
.stat-label {
  margin-top: 6px;
  color: var(--soft-ink);
  font-size: .9rem;
  font-weight: 500;
}

/* Project Grid */
.project-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.project-card {
  padding: 32px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  text-decoration: none;
  display: flex;
  flex-direction: column;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.project-card:hover {
  border-color: var(--accent);
  box-shadow: 0 4px 24px var(--accent-glow);
}
.project-card.wide { grid-column: 1 / -1; }

.project-tag {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 6px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: .72rem;
  font-weight: 600;
  letter-spacing: .04em;
  text-transform: uppercase;
  width: fit-content;
  margin-bottom: 14px;
}

.project-card h3 {
  font: 600 1.3rem/1.3 "Inter", sans-serif;
  letter-spacing: -.02em;
  margin-bottom: 8px;
}

.project-card p {
  color: var(--soft-ink);
  font-size: .92rem;
  line-height: 1.65;
  flex: 1;
}

.project-meta {
  margin-top: 16px;
  display: flex;
  gap: 16px;
  font-size: .78rem;
  color: var(--muted);
}

/* Posts */
.posts { display: grid; grid-template-columns: 1fr; gap: 20px; }

.post-card {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 32px;
  padding: 28px 32px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: border-color var(--transition);
  align-items: start;
}
.post-card:hover { border-color: var(--accent); }

.post-card .meta {
  font-size: .78rem;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: .06em;
  margin-bottom: 6px;
}

.post-card h3 {
  font: 500 1.55rem/1.3 "Georgia", "Noto Serif SC", serif;
  letter-spacing: -.02em;
  margin-bottom: 6px;
}
.post-card h3 a { text-decoration: none; }
.post-card h3 a:hover { color: var(--accent); }

.post-card .excerpt {
  color: var(--soft-ink);
  font-size: .95rem;
}

.post-card .read-time {
  font-size: .75rem;
  color: var(--muted);
  white-space: nowrap;
  margin-top: 4px;
}

/* Tags */
.tag-list { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }
.tag {
  padding: 2px 12px;
  border-radius: 20px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: .75rem;
  font-weight: 600;
  text-decoration: none;
  transition: background var(--transition);
}
.tag:hover { background: var(--accent); color: #fff; }

/* About */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
}

.about-copy {
  font: 400 1.25rem/1.7 "Georgia", "Noto Serif SC", serif;
  color: var(--soft-ink);
}

.about-copy p { margin-bottom: 1.2em; }

.about-interests {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  align-content: start;
}

.interest-item {
  padding: 16px 18px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-size: .9rem;
  font-weight: 500;
}
.interest-item .emoji { margin-right: 8px; }
.interest-desc {
  display: block;
  font-weight: 400;
  color: var(--muted);
  font-size: .8rem;
  margin-top: 4px;
}

/* Contact */
.contact-content {
  max-width: 640px;
  font-size: 1.1rem;
  color: var(--soft-ink);
  line-height: 1.8;
}
.contact-channels {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 28px;
}
.contact-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  text-decoration: none;
  font-weight: 550;
  font-size: .9rem;
  transition: border-color var(--transition), background var(--transition);
}
.contact-link:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.domain {
  margin-top: 48px;
  color: var(--ink);
  font: 500 clamp(1.8rem, 5vw, 4rem)/1 "Georgia", serif;
  letter-spacing: -.04em;
  overflow-wrap: anywhere;
}

/* Footer */
footer {
  width: min(1120px, calc(100% - 48px));
  margin: 0 auto;
  min-height: 100px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: .85rem;
  padding: 28px 0;
}

/* ---- Article / Post Page ---- */
.article-page { max-width: 780px; margin: 0 auto; padding: 80px 0 120px; }
.article-page h1 { font-size: clamp(2.6rem, 6vw, 5rem); margin-bottom: 12px; }
.article-page .meta-line {
  font-size: .85rem;
  color: var(--muted);
  margin-bottom: 40px;
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}
.article-page .meta-line span { display: flex; align-items: center; gap: 6px; }

.article-body {
  font: 400 1.1rem/1.9 "Georgia", "Noto Serif SC", serif;
  color: var(--ink);
}
.article-body p { margin-bottom: 1.6em; }
.article-body h2 {
  font-size: 1.6rem;
  margin: 2em 0 .6em;
  font-family: "Georgia", "Noto Serif SC", serif;
  letter-spacing: -.02em;
}
.article-body h3 {
  font-size: 1.25rem;
  margin: 1.6em 0 .4em;
  font-family: "Georgia", "Noto Serif SC", serif;
}
.article-body ul, .article-body ol { margin: 0 0 1.6em 1.4em; }
.article-body li { margin-bottom: .4em; }
.article-body code {
  padding: 2px 8px;
  background: var(--accent-soft);
  border-radius: 4px;
  font-size: .88em;
  font-family: "JetBrains Mono", "Fira Code", monospace;
}
.article-body pre {
  padding: 20px;
  background: var(--ink);
  color: #e4e4e7;
  border-radius: var(--radius);
  overflow-x: auto;
  font-size: .88rem;
  line-height: 1.6;
  margin: 0 0 1.6em;
}
.article-body pre code {
  background: none;
  padding: 0;
  color: inherit;
}
.article-body blockquote {
  margin: 0 0 1.6em;
  padding: 16px 20px;
  border-left: 4px solid var(--accent);
  background: var(--accent-soft);
  border-radius: 0 var(--radius) var(--radius) 0;
  font-style: italic;
  color: var(--soft-ink);
}
.article-body a { color: var(--accent); text-decoration: underline; }

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 44px;
  font-weight: 650;
  text-decoration: none;
  margin-top: 48px;
}
.back-link:hover { color: var(--accent); }

/* Responsive */
@media (max-width: 820px) {
  .container, footer { width: min(100% - 32px, 1120px); }
  .hero { min-height: auto; padding: 72px 0; }
  h1 { font-size: clamp(2.6rem, 12vw, 4rem); }
  .section { padding: 72px 0; }
  .section-heading { grid-template-columns: 40px 1fr; margin-bottom: 36px; }
  .stats { grid-template-columns: 1fr 1fr; }
  .project-grid { grid-template-columns: 1fr; }
  .project-card.wide { grid-column: 1; }
  .about-grid { grid-template-columns: 1fr; }
  .about-interests { grid-template-columns: 1fr 1fr; }
  .post-card { grid-template-columns: 1fr; gap: 16px; }
}

@media (max-width: 540px) {
  .site-header { min-height: 64px; flex-wrap: wrap; gap: 10px; padding: 12px 0; }
  nav { gap: 16px; }
  .stats { grid-template-columns: 1fr; }
  .about-interests { grid-template-columns: 1fr; }
  footer { flex-direction: column; gap: 8px; text-align: center; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .01ms !important; }
}