/* Csea — 素雅文青风格 / Elegant & warm aesthetic */
:root {
  --bg: #faf9f6;
  --bg-soft: #f4f3f0;
  --bg-accent: #ede9e3;
  --text: #3d3d3d;
  --text-dim: #7a7a7a;
  --accent: #a0826d;
  --accent-2: #b8956a;
  --border: #d9cfc3;
  --radius: 12px;
  --max: 1080px;
  --serif: "Merriweather", "Noto Serif SC", Georgia, serif;
  --sans: "Inter", "Noto Sans SC", system-ui, sans-serif;
  --mono: "JetBrains Mono", "Courier New", monospace;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--accent-2); }

/* Layout */
section { max-width: var(--max); margin: 0 auto; padding: 80px 24px; }

.kicker {
  font-family: var(--serif);
  font-size: 13px;
  letter-spacing: 0.15em;
  color: var(--accent);
  margin-bottom: 12px;
  font-weight: 500;
}

.section-title {
  font-family: var(--serif);
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 700;
  color: var(--text);
  margin-bottom: 40px;
}

/* Nav */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(250, 249, 246, 0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-logo {
  font-family: var(--serif);
  font-weight: 700;
  font-size: 22px;
  color: var(--text);
}
.nav-links {
  display: flex;
  gap: 24px;
  align-items: center;
}
.nav-links a {
  font-size: 14px;
  color: var(--text-dim);
}
.nav-links a:hover { color: var(--accent); }

.lang-btn {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--text-dim);
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 6px 12px;
  cursor: pointer;
  transition: all 0.2s;
}
.lang-btn:hover { border-color: var(--accent); color: var(--accent); }

/* Hero */
.hero {
  min-height: 85vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding-top: 40px;
  padding-bottom: 40px;
}
.hero-tagline {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: 16px;
}
.hero-title {
  font-family: var(--serif);
  font-size: clamp(56px, 10vw, 88px);
  font-weight: 700;
  line-height: 1.1;
  color: var(--text);
  margin-bottom: 20px;
}
.hero-subtitle {
  font-size: clamp(17px, 2vw, 20px);
  color: var(--text-dim);
  max-width: 540px;
  margin-bottom: 36px;
}
.hero-cta { display: flex; gap: 12px; flex-wrap: wrap; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 12px 24px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
  border: 1px solid transparent;
}
.btn-primary {
  background: var(--accent);
  color: #fff;
}
.btn-primary:hover { background: var(--accent-2); }
.btn-ghost {
  border: 1px solid var(--border);
  color: var(--text);
}
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }

/* About */
.about-body { display: flex; flex-direction: column; gap: 12px; }
.about-body p { color: var(--text-dim); font-size: 16px; max-width: 680px; line-height: 1.8; }
.stack-heading { font-family: var(--serif); font-size: 14px; color: var(--text-dim); margin: 28px 0 14px; }
.stack-tags { display: flex; flex-wrap: wrap; gap: 10px; }
.stack-tag {
  font-size: 13px;
  padding: 6px 14px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--bg-soft);
  color: var(--text);
  transition: all 0.2s;
}
.stack-tag:hover { border-color: var(--accent); color: var(--accent); background: #fff; }

/* Products */
.products-intro { color: var(--text-dim); font-size: 16px; margin-bottom: 32px; }
.product-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 20px; }
.product-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: all 0.25s;
}
.product-card:hover { transform: translateY(-2px); border-color: var(--accent); box-shadow: 0 8px 16px rgba(0,0,0,0.04); }
.product-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 12px; }
.product-name { font-family: var(--serif); font-size: 18px; font-weight: 700; }
.badge {
  font-family: var(--mono);
  font-size: 10px;
  padding: 3px 10px;
  border-radius: 999px;
  white-space: nowrap;
  letter-spacing: 0.05em;
}
.badge-soon { background: #f0e8df; color: #8b7355; }
.badge-building { background: #e8f0f8; color: #5a7a9e; }
.badge-live { background: #e8f5e9; color: #558b2f; }
.product-desc { color: var(--text-dim); font-size: 14px; margin-bottom: 16px; }
.product-tags { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 14px; }
.product-tags span { font-size: 12px; color: var(--text-dim); padding: 2px 8px; border: 1px solid var(--border); border-radius: 4px; }
.product-links { display: flex; gap: 12px; }
.product-links a { font-size: 13px; color: var(--accent); font-weight: 500; }

/* Experience */
.exp-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; }
.exp-col h3 { font-family: var(--serif); font-size: 14px; color: var(--text-dim); letter-spacing: 0.1em; margin-bottom: 24px; }
.timeline { position: relative; padding-left: 24px; }
.timeline::before { content: ""; position: absolute; left: 5px; top: 6px; bottom: 6px; width: 1px; background: var(--border); }
.tl-item { position: relative; padding-bottom: 28px; }
.tl-item::before {
  content: "";
  position: absolute;
  left: -23px;
  top: 4px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: #fff;
  border: 2px solid var(--accent);
}
.tl-period { font-family: var(--mono); font-size: 11px; color: var(--text-dim); margin-bottom: 4px; }
.tl-title { font-size: 16px; font-weight: 600; color: var(--text); }
.tl-sub { font-size: 13px; color: var(--accent); margin-bottom: 6px; }
.tl-desc { font-size: 13px; color: var(--text-dim); }

/* Blog */
.blog-intro { color: var(--text-dim); font-size: 16px; margin-bottom: 28px; }
.blog-filter { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 32px; }
.filter-btn {
  font-size: 13px;
  padding: 6px 14px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--bg-soft);
  color: var(--text-dim);
  cursor: pointer;
  transition: all 0.2s;
}
.filter-btn.active { background: var(--accent); color: #fff; border-color: var(--accent); }
.filter-btn:hover { border-color: var(--accent); color: var(--accent); }

.blog-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 20px; }
.blog-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  cursor: pointer;
  transition: all 0.25s;
}
.blog-card:hover { transform: translateY(-2px); border-color: var(--accent); }
.blog-card-date { font-family: var(--mono); font-size: 12px; color: var(--text-dim); margin-bottom: 8px; }
.blog-card-title { font-family: var(--serif); font-size: 18px; font-weight: 700; margin-bottom: 10px; color: var(--text); }
.blog-card-excerpt { font-size: 14px; color: var(--text-dim); margin-bottom: 12px; }
.blog-card-cat { font-size: 12px; color: var(--accent); font-weight: 500; }

.blog-post { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 40px; }
.blog-post-back { display: inline-flex; align-items: center; gap: 4px; font-size: 13px; color: var(--accent); margin-bottom: 24px; cursor: pointer; }
.blog-post-back:hover { text-decoration: underline; }
.blog-post-meta { display: flex; align-items: center; gap: 16px; font-size: 13px; color: var(--text-dim); margin-bottom: 24px; padding-bottom: 16px; border-bottom: 1px solid var(--border); }
.blog-post-title { font-family: var(--serif); font-size: 36px; font-weight: 700; margin-bottom: 24px; }
.blog-post-content { font-size: 16px; line-height: 1.9; color: var(--text); max-width: 680px; }
.blog-post-content h2 { font-family: var(--serif); font-size: 24px; font-weight: 700; margin: 32px 0 16px; }
.blog-post-content h3 { font-family: var(--serif); font-size: 18px; font-weight: 700; margin: 24px 0 12px; }
.blog-post-content p { margin-bottom: 16px; }
.blog-post-content ul, .blog-post-content ol { margin-left: 24px; margin-bottom: 16px; }
.blog-post-content li { margin-bottom: 8px; }
.blog-post-content code { font-family: var(--mono); font-size: 14px; background: var(--bg-soft); padding: 2px 6px; border-radius: 4px; }
.blog-post-content pre { background: var(--bg-soft); padding: 16px; border-radius: 8px; overflow-x: auto; margin-bottom: 16px; }
.blog-post-content pre code { background: none; padding: 0; }

/* Contact */
.contact-body { color: var(--text-dim); font-size: 16px; margin-bottom: 28px; max-width: 540px; }
.contact-list { display: flex; flex-wrap: wrap; gap: 12px; }
.contact-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 20px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #fff;
  transition: all 0.2s;
  min-width: 160px;
}
.contact-item:hover { border-color: var(--accent); transform: translateY(-1px); }
.contact-item .label { font-family: var(--mono); font-size: 11px; color: var(--text-dim); }
.contact-item .value { font-size: 14px; color: var(--accent); font-weight: 500; }

/* Footer */
.footer {
  max-width: var(--max);
  margin: 0 auto;
  padding: 40px 24px 60px;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--text-dim);
  font-size: 13px;
  flex-wrap: wrap;
  gap: 12px;
}

/* Reveal animation */
.reveal { opacity: 0; transform: translateY(20px); transition: opacity 0.6s, transform 0.6s; }
.reveal.in { opacity: 1; transform: none; }

/* Responsive */
@media (max-width: 760px) {
  section { padding: 60px 20px; }
  .exp-layout { grid-template-columns: 1fr; gap: 40px; }
  .nav-links a:not(.lang-btn) { display: none; }
  .hero { min-height: 70vh; }
  .blog-post { padding: 24px; }
  .blog-post-title { font-size: 28px; }
}