/* ============================================================
   Field Notes — blog styles. Matches the resume aesthetic.
   ============================================================ */
:root {
  --maxw: 760px;
  --accent: #f5a623;
  --accent-2: #8a9bff;
  --accent-3: #4fd6c4;
  --radius: 16px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}
html[data-theme="dark"] {
  --bg: #0c0d11; --bg-2: #0f1116;
  --surface: rgba(255,255,255,0.026); --surface-2: rgba(255,255,255,0.045);
  --border: rgba(255,255,255,0.09); --border-strong: rgba(255,255,255,0.16);
  --ink: #edeef1; --ink-soft: #aab1bd; --muted: #6f7783;
  --code-bg: rgba(255,255,255,0.04);
  --blob-1: #f5a623; --blob-2: #7b5cff; --blob-opacity: 0.26;
}
html[data-theme="light"] {
  --bg: #f7f5f1; --bg-2: #fffefb;
  --surface: rgba(255,255,255,0.7); --surface-2: #ffffff;
  --border: rgba(20,20,20,0.09); --border-strong: rgba(20,20,20,0.16);
  --ink: #1a1c20; --ink-soft: #4b525c; --muted: #8a909b; --accent: #c2620a;
  --code-bg: rgba(20,20,20,0.05);
  --blob-1: #f5a623; --blob-2: #9d8bff; --blob-opacity: 0.18;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 16px; line-height: 1.65; -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
::selection { background: color-mix(in srgb, var(--accent) 35%, transparent); }
a { color: var(--accent); text-decoration: none; }

/* ambient */
.ambient { position: fixed; inset: 0; z-index: -1; overflow: hidden; background: var(--bg); }
.blob { position: absolute; border-radius: 50%; filter: blur(95px); opacity: var(--blob-opacity); }
.blob-1 { width: 480px; height: 480px; background: var(--blob-1); top: -160px; left: -120px; }
.blob-2 { width: 440px; height: 440px; background: var(--blob-2); top: 8%; right: -150px; }

/* nav */
.bnav {
  position: sticky; top: 0; z-index: 50;
  display: flex; align-items: center; gap: 18px;
  max-width: var(--maxw); margin: 0 auto; padding: 16px 24px;
  backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
}
.bnav-brand { font-family: "JetBrains Mono", monospace; font-weight: 600; font-size: 1.1rem; color: var(--ink); }
.bnav-brand span { color: var(--accent); }
.bnav-links { display: flex; gap: 4px; margin-left: 6px; }
.bnav-links a {
  font-size: 0.9rem; font-weight: 500; color: var(--ink-soft);
  padding: 6px 12px; border-radius: 99px; transition: color 0.2s, background 0.2s;
}
.bnav-links a:hover { color: var(--ink); background: var(--surface-2); }
.bnav-links a.is-active { color: var(--accent); background: color-mix(in srgb, var(--accent) 12%, transparent); }
.bnav .lang-toggle { margin-left: auto; }
.theme-toggle {
  display: grid; place-items: center; width: 34px; height: 34px; border-radius: 50%;
  border: 1px solid var(--border); background: var(--surface); color: var(--ink-soft);
  cursor: pointer; font-size: 0.9rem; transition: color 0.2s, transform 0.2s, border-color 0.2s;
}
.theme-toggle:hover { color: var(--accent); border-color: var(--border-strong); transform: rotate(15deg); }
.icon-moon { display: none; }
html[data-theme="light"] .icon-sun { display: none; }
html[data-theme="light"] .icon-moon { display: inline; }

.bwrap { max-width: var(--maxw); margin: 0 auto; padding: 28px 24px 96px; min-height: 60vh; }
.bloading, .berror { color: var(--muted); padding: 40px 0; font-family: "JetBrains Mono", monospace; font-size: 0.9rem; }

/* ---------- List ---------- */
.blist-head { margin: 24px 0 40px; }
.bkicker {
  display: inline-block; font-family: "JetBrains Mono", monospace; font-size: 0.74rem; font-weight: 600;
  letter-spacing: 0.14em; text-transform: uppercase; color: var(--accent); margin-bottom: 14px;
}
.blist-head h1 {
  font-family: "Newsreader", Georgia, serif; font-weight: 600; font-size: clamp(2rem, 6vw, 3rem);
  line-height: 1.08; letter-spacing: -0.015em; margin: 0 0 16px;
}
.blist-head p { color: var(--ink-soft); margin: 0; max-width: 56ch; font-size: 1.02rem; }

.bcards { display: grid; gap: 16px; }
.bcard {
  display: block; padding: 24px 26px; border: 1px solid var(--border); border-radius: var(--radius);
  background: var(--surface); color: inherit; position: relative; overflow: hidden;
  transition: transform 0.28s var(--ease), border-color 0.28s, background 0.28s;
}
.bcard::before {
  content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 3px;
  background: linear-gradient(var(--accent), var(--accent-2)); transform: scaleY(0); transform-origin: top;
  transition: transform 0.35s var(--ease);
}
.bcard:hover { transform: translateY(-3px); border-color: var(--border-strong); background: var(--surface-2); }
.bcard:hover::before { transform: scaleY(1); }
.bcard-meta { font-family: "JetBrains Mono", monospace; font-size: 0.78rem; color: var(--muted); margin-bottom: 8px; }
.bcard h2 { font-family: "Newsreader", serif; font-weight: 600; font-size: 1.5rem; line-height: 1.2; margin: 0 0 8px; }
.bcard p { color: var(--ink-soft); font-size: 0.96rem; margin: 0 0 14px; }
.bcard-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 12px; }
.btag {
  font-family: "JetBrains Mono", monospace; font-size: 0.7rem; font-weight: 500;
  padding: 4px 10px; border-radius: 99px; border: 1px solid var(--border);
  background: var(--surface-2); color: var(--ink-soft);
}
.bcard-more { font-size: 0.85rem; font-weight: 600; color: var(--accent); }

/* ---------- Post ---------- */
.bpost-up { display: inline-block; font-family: "JetBrains Mono", monospace; font-size: 0.82rem; color: var(--ink-soft); margin: 8px 0 28px; }
.bpost-up:hover { color: var(--accent); }
.bpost-head { margin-bottom: 36px; padding-bottom: 24px; border-bottom: 1px solid var(--border); }
.bpost-meta { font-family: "JetBrains Mono", monospace; font-size: 0.8rem; color: var(--muted); margin-bottom: 14px; display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.bpost-meta .dot { color: var(--border-strong); }
.bpost-head h1 {
  font-family: "Newsreader", serif; font-weight: 600; font-size: clamp(2rem, 6vw, 3rem);
  line-height: 1.1; letter-spacing: -0.015em; margin: 0 0 14px;
}
.bpost-sum { font-family: "Newsreader", serif; font-style: italic; font-size: 1.22rem; color: var(--ink-soft); margin: 0; line-height: 1.45; }

/* prose typography */
.bprose { font-size: 1.08rem; line-height: 1.75; color: var(--ink-soft); }
.bprose > *:first-child { margin-top: 0; }
.bprose h2 {
  font-family: "Newsreader", serif; font-weight: 600; font-size: 1.7rem; line-height: 1.25;
  color: var(--ink); margin: 2.2em 0 0.6em; letter-spacing: -0.01em;
}
.bprose h3 { font-family: "Newsreader", serif; font-weight: 600; font-size: 1.35rem; color: var(--ink); margin: 1.8em 0 0.5em; }
.bprose p { margin: 0 0 1.25em; }
.bprose a { border-bottom: 1px solid color-mix(in srgb, var(--accent) 35%, transparent); transition: border-color 0.2s; }
.bprose a:hover { border-bottom-color: var(--accent); }
.bprose strong { color: var(--ink); font-weight: 600; }
.bprose em { font-style: italic; }
.bprose ul, .bprose ol { margin: 0 0 1.25em; padding-left: 1.3em; }
.bprose li { margin-bottom: 0.5em; }
.bprose ul li::marker { color: var(--accent); }
.bprose blockquote {
  margin: 1.5em 0; padding: 4px 0 4px 22px; border-left: 3px solid var(--accent);
  color: var(--ink); font-family: "Newsreader", serif; font-style: italic; font-size: 1.15rem;
}
.bprose code {
  font-family: "JetBrains Mono", monospace; font-size: 0.88em;
  background: var(--code-bg); padding: 2px 7px; border-radius: 6px; color: var(--accent);
}
.bprose pre {
  background: var(--code-bg); border: 1px solid var(--border); border-radius: 12px;
  padding: 18px 20px; overflow-x: auto; margin: 0 0 1.5em;
}
.bprose pre code { background: none; padding: 0; color: var(--ink-soft); font-size: 0.86rem; line-height: 1.6; }
.bprose img { max-width: 100%; border-radius: 12px; margin: 1em 0; display: block; }
.bprose hr { border: none; border-top: 1px solid var(--border); margin: 2.4em 0; }
.bprose table { width: 100%; border-collapse: collapse; margin: 0 0 1.5em; font-size: 0.95rem; }
.bprose th, .bprose td { text-align: left; padding: 8px 12px; border-bottom: 1px solid var(--border); }
.bprose th { color: var(--ink); font-weight: 600; }

.bpost-foot { margin-top: 48px; padding-top: 26px; border-top: 1px solid var(--border); display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }
.bpost-foot a.btn-back {
  font-family: "JetBrains Mono", monospace; font-size: 0.84rem; font-weight: 600; color: var(--accent);
  padding: 9px 16px; border-radius: 99px; border: 1px solid color-mix(in srgb, var(--accent) 32%, transparent);
  background: color-mix(in srgb, var(--accent) 8%, transparent); transition: transform 0.2s var(--ease), border-color 0.2s;
}
.bpost-foot a.btn-back:hover { transform: translateY(-2px); border-color: var(--accent); }
.bpost-foot .byline { color: var(--muted); font-size: 0.86rem; }

/* footer */
.bfoot {
  max-width: var(--maxw); margin: 0 auto; padding: 28px 24px 48px;
  border-top: 1px solid var(--border); color: var(--muted); font-size: 0.85rem;
  display: flex; gap: 10px; align-items: center; flex-wrap: wrap;
}
.bfoot a { color: var(--ink-soft); }
.bfoot a:hover { color: var(--accent); }

/* ---------- AI disclaimer ---------- */
.bdisclaimer {
  margin: 20px 0 0; padding: 12px 16px; border: 1px solid var(--border); border-left: 3px solid var(--accent-2);
  border-radius: 10px; background: var(--surface);
  font-size: 0.85rem; line-height: 1.6; color: var(--muted);
}
.bdisclaimer-post { margin: 40px 0 0; }

/* ---------- Language toggle (nav) ---------- */
.lang-toggle {
  display: grid; place-items: center; min-width: 42px; height: 34px; padding: 0 11px; border-radius: 99px;
  border: 1px solid var(--border); background: var(--surface); color: var(--ink-soft);
  cursor: pointer; font-family: "JetBrains Mono", monospace; font-size: 0.8rem; font-weight: 600;
  transition: color 0.2s, border-color 0.2s;
}
.lang-toggle:hover { color: var(--accent); border-color: var(--border-strong); }

/* ---------- Section tabs ---------- */
.btabs { display: flex; flex-wrap: wrap; gap: 8px; margin: 0 0 28px; }
.btab {
  font-family: "JetBrains Mono", monospace; font-size: 0.8rem; font-weight: 500;
  padding: 7px 14px; border-radius: 99px; border: 1px solid var(--border);
  background: var(--surface); color: var(--ink-soft); cursor: pointer;
  transition: color 0.2s, border-color 0.2s, background 0.2s;
}
.btab:hover { color: var(--ink); border-color: var(--border-strong); }
.btab.is-on { color: var(--bg); background: var(--accent); border-color: var(--accent); }
.btab-n { opacity: 0.6; font-size: 0.72rem; }
.btab.is-on .btab-n { opacity: 0.85; }

/* card section + bilingual chips */
.bcard-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 7px; }
.bcard-sec { color: var(--accent); }
.bcard-bi { color: var(--muted); }
.bcard-sec::before, .bcard-bi::before { content: "·"; color: var(--border-strong); margin-right: 7px; }

/* ---------- Per-post language switch ---------- */
.bpost-langs {
  display: inline-flex; gap: 4px; margin-top: 20px; padding: 4px;
  border: 1px solid var(--border); border-radius: 99px; background: var(--surface);
}
.blng {
  font-family: "JetBrains Mono", monospace; font-size: 0.78rem; font-weight: 500;
  padding: 5px 15px; border-radius: 99px; border: none; background: transparent;
  color: var(--ink-soft); cursor: pointer; transition: color 0.2s, background 0.2s;
}
.blng:hover { color: var(--ink); }
.blng.is-on { background: var(--accent); color: var(--bg); }

/* ---------- CJK fallback fonts (only used for Chinese glyphs) ---------- */
body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI",
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}
.blist-head h1, .bpost-head h1, .bpost-sum, .bcard h2, .bprose h2, .bprose h3, .bprose blockquote {
  font-family: "Newsreader", Georgia, "Songti SC", "Noto Serif SC", "Source Han Serif SC", serif;
}
/* Chinese prose: a touch more breathing room */
.bprose.is-zh { line-height: 1.9; letter-spacing: 0.01em; }
.bprose.is-zh p { margin-bottom: 1.3em; }

@media (max-width: 520px) {
  .bwrap { padding: 20px 18px 72px; }
  .bnav { padding: 12px 16px; gap: 8px; }
  .bnav-links { gap: 2px; margin-left: 2px; }
  .bnav-links a { padding: 5px 9px; font-size: 0.86rem; }
  .lang-toggle { min-width: 36px; padding: 0 8px; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } .bcard { transition: none; } }