/* ============================================================
   CodeZa 码志 · 简约科技风
   个人博客 + 作品集 · 静态站
   ============================================================ */

/* ---------- Design Tokens ---------- */
:root {
  --bg: #ffffff;
  --bg-soft: #f8fafc;
  --ink: #0f172a;
  --ink-2: #475569;
  --ink-3: #94a3b8;
  --line: #e2e8f0;
  --accent: #2563eb;
  --accent-ink: #1d4ed8;
  --accent-soft: #eff6ff;
  --code-bg: #f1f5f9;
  --radius: 12px;
  --sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Noto Sans SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", sans-serif;
  --mono: "SF Mono", "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo,
    Consolas, "Liberation Mono", monospace;
  --maxw: 1000px;
}

/* ---------- Reset & Base ---------- */
*,
*::before,
*::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--sans);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.75;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

img { max-width: 100%; display: block; }

::selection { background: var(--accent); color: #fff; }

.container {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}

.mono { font-family: var(--mono); }
.dim { color: var(--ink-3); }
.accent { color: var(--accent); }

/* ---------- Navigation ---------- */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--line);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.brand {
  font-family: var(--mono);
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--ink);
  letter-spacing: -0.02em;
}
.brand:hover { text-decoration: none; }
.brand .dot { color: var(--accent); }

.nav-links { display: flex; gap: 28px; list-style: none; align-items: center; }
.nav-links a {
  color: var(--ink-2);
  font-size: 0.95rem;
  font-weight: 500;
  transition: color 0.15s ease;
}
.nav-links a:hover { color: var(--accent); text-decoration: none; }
.nav-links a.active { color: var(--accent); }

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--line);
  border-radius: 8px;
  width: 40px;
  height: 40px;
  cursor: pointer;
  color: var(--ink);
  font-size: 1.1rem;
  line-height: 1;
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  padding: 96px 0 88px;
  background-color: var(--bg);
  background-image:
    linear-gradient(to right, rgba(37, 99, 235, 0.05) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(37, 99, 235, 0.05) 1px, transparent 1px);
  background-size: 44px 44px;
  border-bottom: 1px solid var(--line);
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--accent-ink);
  background: var(--accent-soft);
  border: 1px solid #dbeafe;
  border-radius: 999px;
  padding: 4px 14px;
  margin-bottom: 24px;
}
.hero-badge .caret { color: var(--ink-3); }

.hero h1 {
  font-size: clamp(2.1rem, 5.5vw, 3.2rem);
  line-height: 1.2;
  letter-spacing: -0.03em;
  font-weight: 800;
  margin-bottom: 18px;
}

.hero p.lead {
  font-size: 1.12rem;
  color: var(--ink-2);
  max-width: 560px;
  margin-bottom: 32px;
}

.hero-cta { display: flex; gap: 14px; flex-wrap: wrap; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 22px;
  border-radius: 10px;
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid transparent;
  transition: all 0.15s ease;
  cursor: pointer;
}
.btn:hover { text-decoration: none; }

.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 2px 10px rgba(37, 99, 235, 0.25);
}
.btn-primary:hover { background: var(--accent-ink); }

.btn-ghost {
  background: var(--bg);
  color: var(--ink);
  border-color: var(--line);
}
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }

/* ---------- Sections ---------- */
.section { padding: 72px 0; }
.section-alt { background: var(--bg-soft); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }

.section-head { margin-bottom: 36px; }

.sec-label {
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--accent);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  display: block;
  margin-bottom: 8px;
}

.section h2 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.section .more { float: right; font-size: 0.9rem; padding-top: 8px; }

/* ---------- Post List ---------- */
.post-list { list-style: none; display: flex; flex-direction: column; gap: 0; }

.post-item {
  display: flex;
  align-items: baseline;
  gap: 20px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
}
.post-item:first-child { border-top: 1px solid var(--line); }

.post-date {
  font-family: var(--mono);
  font-size: 0.82rem;
  color: var(--ink-3);
  white-space: nowrap;
  flex-shrink: 0;
}

.post-main { flex: 1; min-width: 0; }

.post-title {
  font-size: 1.08rem;
  font-weight: 600;
  color: var(--ink);
  line-height: 1.5;
}
.post-title:hover { color: var(--accent); text-decoration: none; }

.post-excerpt { color: var(--ink-2); font-size: 0.92rem; margin-top: 4px; }

.post-tags { display: flex; gap: 8px; margin-top: 8px; flex-wrap: wrap; }

.tag {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--accent-ink);
  background: var(--accent-soft);
  border: 1px solid #dbeafe;
  border-radius: 999px;
  padding: 1px 10px;
}

/* ---------- Work Cards ---------- */
.work-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}

.work-card {
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px;
  transition: all 0.18s ease;
}
.work-card:hover {
  transform: translateY(-3px);
  border-color: #bfdbfe;
  box-shadow: 0 8px 24px rgba(15, 23, 42, 0.06);
}

.work-card .num {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--ink-3);
}

.work-card h3 {
  font-size: 1.08rem;
  margin: 8px 0 8px;
  font-weight: 700;
}

.work-card p {
  color: var(--ink-2);
  font-size: 0.92rem;
  margin-bottom: 14px;
}

/* ---------- About ---------- */
.about-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 48px;
  align-items: start;
}

.about-grid p { color: var(--ink-2); margin-bottom: 14px; }
.about-grid strong { color: var(--ink); }

.skill-list { list-style: none; display: flex; flex-wrap: wrap; gap: 10px; }

.skill-list li {
  font-family: var(--mono);
  font-size: 0.82rem;
  color: var(--ink);
  background: var(--code-bg);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 5px 12px;
}

.tool-block {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 16px;
  background: var(--bg);
}
.tool-block h4 { font-size: 0.95rem; margin-bottom: 6px; }
.tool-block ul { list-style: none; color: var(--ink-2); font-size: 0.9rem; }
.tool-block li { padding: 2px 0; }
.tool-block li::before {
  content: "→ ";
  font-family: var(--mono);
  color: var(--accent);
}

/* ---------- Page Header (inner pages) ---------- */
.page-head { padding: 72px 0 40px; border-bottom: 1px solid var(--line); }
.page-head h1 {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 800;
  letter-spacing: -0.03em;
}
.page-head p { color: var(--ink-2); margin-top: 8px; max-width: 600px; }

/* ---------- Article ---------- */
.post-article { padding: 56px 0 80px; }

.post-article .post-meta {
  font-family: var(--mono);
  font-size: 0.85rem;
  color: var(--ink-3);
  margin-bottom: 32px;
}

.post-article h1 {
  font-size: clamp(1.7rem, 4vw, 2.3rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.3;
  margin-bottom: 12px;
}

.post-body { max-width: 720px; }

.post-body p { margin-bottom: 18px; color: var(--ink-2); }
.post-body h2 {
  font-size: 1.35rem;
  font-weight: 700;
  margin: 36px 0 14px;
  letter-spacing: -0.01em;
}
.post-body h3 { font-size: 1.1rem; margin: 28px 0 10px; }

.post-body ul, .post-body ol { margin: 0 0 18px 24px; color: var(--ink-2); }
.post-body li { margin-bottom: 6px; }

.post-body code {
  font-family: var(--mono);
  font-size: 0.85em;
  background: var(--code-bg);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 2px 7px;
  color: #be123c;
}

.post-body pre {
  background: var(--ink);
  color: #e2e8f0;
  border-radius: var(--radius);
  padding: 20px 24px;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 0.86rem;
  line-height: 1.7;
  margin: 0 0 22px;
}
.post-body pre code { background: none; border: none; color: inherit; padding: 0; }

.post-body blockquote {
  border-left: 3px solid var(--accent);
  background: var(--accent-soft);
  color: var(--ink-2);
  padding: 14px 20px;
  border-radius: 0 var(--radius) var(--radius) 0;
  margin: 0 0 18px;
}

.post-nav { margin-top: 48px; padding-top: 24px; border-top: 1px solid var(--line); }
.post-nav a { font-size: 0.92rem; }

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--line);
  background: var(--bg-soft);
  padding: 32px 0;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  font-size: 0.85rem;
  color: var(--ink-2);
}
.footer-inner .mono { font-size: 0.8rem; }

/* ---------- Page (内部页通用) ---------- */
.page-title { padding: 64px 0 32px; }
.page-title h1 { font-size: clamp(1.8rem, 4vw, 2.5rem); font-weight: 800; letter-spacing: -0.02em; }
.page-title p { color: var(--ink-2); margin-top: 6px; }

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
  .nav-toggle { display: block; }

  .nav-links {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--line);
    padding: 8px 24px 16px;
    box-shadow: 0 12px 24px rgba(15, 23, 42, 0.06);
  }
  .nav-links.open { display: flex; }
  .nav-links a { display: block; padding: 12px 0; border-bottom: 1px solid var(--line); }
  .nav-links a:last-child { border-bottom: none; }

  .hero { padding: 64px 0 56px; }
  .section { padding: 56px 0; }

  .post-item { flex-direction: column; gap: 4px; }

  .about-grid { grid-template-columns: 1fr; gap: 32px; }

  .footer-inner { flex-direction: column; text-align: center; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}

/* ---------- Skill Wall ---------- */
.skill-wall { display: flex; flex-wrap: wrap; gap: 12px; }
.skill-wall .tag { font-size: 0.88rem; padding: 7px 18px; }

/* ---------- CTA ---------- */
.cta { text-align: center; border-top: 1px solid var(--line); }
.cta h2 {
  font-size: clamp(1.6rem, 3.5vw, 2.2rem);
  font-weight: 800;
  letter-spacing: -0.02em;
}
.cta p { margin-top: 10px; }

/* ---------- Timeline ---------- */
.timeline { list-style: none; }
.timeline li {
  display: flex;
  gap: 24px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}
.timeline li:first-child { border-top: 1px solid var(--line); }

.tl-date {
  font-family: var(--mono);
  font-size: 0.82rem;
  color: var(--accent);
  white-space: nowrap;
  flex-shrink: 0;
  padding-top: 3px;
}
.tl-body h3 { font-size: 1.02rem; font-weight: 700; }
.tl-body p { color: var(--ink-2); font-size: 0.92rem; }

/* ---------- Archive ---------- */
.archive-group { margin-bottom: 8px; }
.archive-month {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 8px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--accent-soft);
}
.archive-month .mono { color: var(--accent); }

@media (max-width: 768px) {
  .timeline li { flex-direction: column; gap: 6px; }
}