/* ==========================================================================
   YF Robotics Lab — custom theme
   Light theme · engineering-blue accent · dark monochrome logos on light
   Loaded after minima's main.css so these rules override the defaults.
   ========================================================================== */

:root {
  --brand-color: #2563eb;
  --brand-color-dark: #1d4ed8;
  --brand-color-light: #eff6ff;
  --text-color: #1f2937;
  --background-color: #ffffff;
  --grey-color: #6b7280;
  --site-title-color: #111827;
  --header-border: #e5e7eb;
}

/* ---------- Base typography ---------- */
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
    "Noto Sans CJK SC", "Source Han Sans SC", "Helvetica Neue",
    Helvetica, Arial, sans-serif;
  color: var(--text-color);
  background-color: var(--background-color);
  font-size: 17px;
  line-height: 1.75;
}

a { color: var(--brand-color); }
a:visited { color: var(--brand-color-dark); }
a:hover { color: var(--brand-color-dark); }

.wrapper { max-width: 900px; }

.page-content { padding: 34px 0; }
.page-heading { font-size: 2rem; font-weight: 700; letter-spacing: -0.01em; }

/* ---------- Header ---------- */
.site-header {
  background: #ffffff;
  border-top: 3px solid var(--brand-color);
  border-bottom: 1px solid var(--header-border);
  min-height: 64px;
  position: sticky;
  top: 0;
  z-index: 100;
}

.site-title {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  line-height: 64px;
  color: var(--site-title-color);
  font-weight: 600;
  letter-spacing: 0;
}
.site-title:hover,
.site-title:visited { color: var(--site-title-color); text-decoration: none; }

.site-logo { height: 34px; width: auto; display: block; }
.site-title-text { font-size: 1.15rem; }

.site-nav { line-height: 64px; }
.site-nav .page-link {
  color: #4b5563;
  line-height: 64px;
  padding: 0 12px;
}
.site-nav .page-link:hover { color: var(--brand-color); text-decoration: none; }

.menu-icon > svg path { fill: #4b5563; }
.site-nav .trigger { background: #ffffff; }

/* ---------- Home hero ---------- */
.hero {
  background: linear-gradient(180deg, #f8fafc 0%, #eef2ff 100%);
  border: 1px solid #eef0f3;
  border-radius: 14px;
  text-align: center;
  padding: 48px 24px 40px;
  margin-bottom: 44px;
}
.hero-banner {
  max-width: 340px;
  width: 100%;
  height: auto;
}
.hero-tagline {
  margin: 20px 0 0;
  color: var(--brand-color);
  font-size: 1.15rem;
  letter-spacing: 0.02em;
}

/* ---------- Post list ---------- */
.post-list-heading {
  font-size: 1.4rem;
  font-weight: 700;
  margin: 0 0 6px;
}

.post-list { margin: 0; padding: 0; list-style: none; }
.post-list > li {
  padding: 22px 0;
  border-bottom: 1px solid #eef0f3;
}
.post-list > li:first-child { padding-top: 8px; }
.post-list > li:last-child { border-bottom: none; }

.post-link {
  color: var(--text-color);
  font-weight: 600;
  transition: color 0.15s ease;
}
.post-link:hover { color: var(--brand-color); }

.post-meta { color: var(--grey-color); font-size: 0.85rem; }

.post-list p { color: #4b5563; margin-top: 6px; font-size: 0.98rem; }

/* ---------- Post byline ---------- */
.post-meta-line { margin: 2px 0; }
.post-meta-label {
  font-weight: 600;
  color: #4b5563;
  margin-right: 0.5em;
}

/* ---------- Post content ---------- */
.post-content h2,
.post-content h3 { margin-top: 2em; font-weight: 700; }
.post-content h2 { padding-bottom: 0.35em; border-bottom: 2px solid #eef2ff; }

.post-content a {
  text-decoration: underline;
  text-decoration-color: #bfdbfe;
  text-underline-offset: 3px;
}
.post-content a:hover { text-decoration-color: var(--brand-color); }

.post-content blockquote {
  border-left: 4px solid var(--brand-color);
  background: #f8fafc;
  color: #4b5563;
  padding: 12px 20px;
  border-radius: 0 8px 8px 0;
}

.post-content img { border-radius: 8px; }

/* ---------- Code ---------- */

/* Fenced code blocks */
.post-content pre {
  background: #f8fafc;
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  padding: 16px 18px;
  overflow-x: auto;
  line-height: 1.6;
  font-size: 0.88em;
}
.post-content pre > code {
  background: transparent;
  border: 0;
  border-radius: 0;
  padding: 0;
  color: #24292f;
  font-family: "JetBrains Mono", "Fira Code", "SF Mono", "Cascadia Code",
    "Source Code Pro", Consolas, "Liberation Mono", Menlo, monospace;
}

/* Inline code */
.post-content :not(pre) > code {
  background: var(--brand-color-light);
  color: #1e40af;
  border: 1px solid #dbeafe;
  border-radius: 4px;
  padding: 0.1em 0.4em;
  font-size: 0.85em;
}

/* Syntax highlighting palette (tuned to the accent) */
.post-content .highlight .c,
.post-content .highlight .c1,
.post-content .highlight .cm,
.post-content .highlight .cs,
.post-content .highlight .ch,
.post-content .highlight .cd,
.post-content .highlight .cp,
.post-content .highlight .cpf { color: #6b7280; font-style: italic; }

.post-content .highlight .k,
.post-content .highlight .kd,
.post-content .highlight .kn,
.post-content .highlight .kp,
.post-content .highlight .kr,
.post-content .highlight .kt,
.post-content .highlight .kv { color: #2563eb; font-weight: 600; }

.post-content .highlight .s,
.post-content .highlight .sb,
.post-content .highlight .sc,
.post-content .highlight .sd,
.post-content .highlight .s2,
.post-content .highlight .se,
.post-content .highlight .sh,
.post-content .highlight .si,
.post-content .highlight .sx,
.post-content .highlight .sr,
.post-content .highlight .s1,
.post-content .highlight .ss,
.post-content .highlight .sa,
.post-content .highlight .dl { color: #059669; }

.post-content .highlight .m,
.post-content .highlight .mf,
.post-content .highlight .mh,
.post-content .highlight .mi,
.post-content .highlight .il,
.post-content .highlight .mo,
.post-content .highlight .mb,
.post-content .highlight .mx { color: #d97706; }

.post-content .highlight .nf,
.post-content .highlight .nc,
.post-content .highlight .nn { color: #7c3aed; }

.post-content .highlight .nb,
.post-content .highlight .nt,
.post-content .highlight .nv,
.post-content .highlight .na,
.post-content .highlight .no,
.post-content .highlight .nd,
.post-content .highlight .ni,
.post-content .highlight .ne,
.post-content .highlight .nl,
.post-content .highlight .vc,
.post-content .highlight .vg,
.post-content .highlight .vi,
.post-content .highlight .vm,
.post-content .highlight .bp { color: #0f766e; }

.post-content .highlight .o,
.post-content .highlight .ow,
.post-content .highlight .p,
.post-content .highlight .pi { color: #475569; }

.post-content .highlight .gd { color: #dc2626; }
.post-content .highlight .gi { color: #16a34a; }
.post-content .highlight .err { color: #dc2626; }

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid #e5e7eb;
  background: #fafafa;
  padding: 28px 0;
}
.site-footer .footer-heading { color: var(--grey-color); }

/* ---------- Small screens ---------- */
@media screen and (max-width: 600px) {
  .site-title-text { font-size: 1rem; }
  .hero { padding: 36px 16px 32px; }
  .hero-banner { max-width: 240px; }
}