/* =========================================================
   cropflre.github.io — Design System
   Theme: Geek Terminal · Minimal · Responsive
   ========================================================= */

:root {
  /* Palette — Dark (default) */
  --bg: #0d1117;
  --bg-soft: #161b22;
  --bg-elev: #1c222b;
  --border: #30363d;
  --border-soft: #21262d;
  --fg: #e6edf3;
  --fg-soft: #9da7b3;
  --fg-mute: #6e7681;
  --accent: #7ee787;      /* terminal green */
  --accent-2: #79c0ff;    /* link blue */
  --accent-3: #ffa657;    /* warm orange */
  --danger: #ff7b72;
  --selection: rgba(126, 231, 135, 0.25);

  /* Type */
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI",
    "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", ui-monospace, SFMono-Regular,
    Menlo, Consolas, monospace;

  /* Motion */
  --ease: cubic-bezier(0.2, 0.8, 0.2, 1);
  --radius: 10px;
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
  --max: 960px;
}

[data-theme="light"] {
  --bg: #fbfcfd;
  --bg-soft: #f3f5f8;
  --bg-elev: #ffffff;
  --border: #d0d7de;
  --border-soft: #e5e8ec;
  --fg: #1f2328;
  --fg-soft: #3d444d;
  --fg-mute: #656d76;
  --accent: #1a7f37;
  --accent-2: #0969da;
  --accent-3: #bf6800;
  --danger: #cf222e;
  --selection: rgba(26, 127, 55, 0.18);
  --shadow: 0 6px 24px rgba(140, 149, 159, 0.2);
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--fg);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  transition: background .3s var(--ease), color .3s var(--ease);
}
::selection { background: var(--selection); }
img { max-width: 100%; display: block; border-radius: 8px; }
a { color: var(--accent-2); text-decoration: none; transition: color .2s var(--ease); }
a:hover { color: var(--accent); }

/* Subtle grid background */
body::before {
  content: "";
  position: fixed; inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(var(--border-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--border-soft) 1px, transparent 1px);
  background-size: 48px 48px;
  opacity: .25;
  mask-image: radial-gradient(ellipse at center, black 40%, transparent 85%);
  z-index: -1;
}

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

/* ---------- Nav ---------- */
.nav {
  position: sticky; top: 0;
  z-index: 50;
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  background: color-mix(in oklab, var(--bg) 72%, transparent);
  border-bottom: 1px solid var(--border-soft);
}
.nav-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 64px;
}
.brand {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--fg);
  letter-spacing: -.02em;
  display: inline-flex; align-items: center; gap: 8px;
}
.brand::before {
  content: "▍";
  color: var(--accent);
  animation: blink 1.2s steps(2) infinite;
}
@keyframes blink { 50% { opacity: 0; } }

.nav-links { display: flex; gap: 28px; align-items: center; }
.nav-links a {
  color: var(--fg-soft);
  font-size: 14px;
  font-weight: 500;
}
.nav-links a:hover { color: var(--fg); }

.theme-toggle {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--fg-soft);
  width: 36px; height: 36px;
  border-radius: 8px;
  cursor: pointer;
  display: inline-flex; align-items: center; justify-content: center;
  transition: all .2s var(--ease);
}
.theme-toggle:hover { color: var(--fg); border-color: var(--accent); }

/* ---------- Hero ---------- */
.hero {
  padding: 96px 0 64px;
  border-bottom: 1px solid var(--border-soft);
}
.hero-tag {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--accent);
  margin-bottom: 16px;
}
.hero-title {
  font-size: clamp(32px, 5.5vw, 56px);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin: 0 0 20px;
}
.hero-title .gradient {
  background: linear-gradient(135deg, var(--accent), var(--accent-2) 60%, var(--accent-3));
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero-desc {
  font-size: 18px;
  color: var(--fg-soft);
  max-width: 640px;
  margin: 0 0 32px;
}
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 18px;
  font-size: 14px; font-weight: 500;
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--fg);
  background: var(--bg-soft);
  transition: all .2s var(--ease);
  cursor: pointer;
}
.btn:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-1px); }
.btn-primary {
  background: var(--accent);
  color: #0d1117;
  border-color: var(--accent);
}
.btn-primary:hover { filter: brightness(1.1); color: #0d1117; }

/* ---------- Section ---------- */
.section { padding: 72px 0; }
.section-title {
  font-size: 13px;
  font-family: var(--font-mono);
  color: var(--fg-mute);
  text-transform: uppercase;
  letter-spacing: .15em;
  margin: 0 0 24px;
  display: flex; align-items: center; gap: 10px;
}
.section-title::before {
  content: ""; width: 24px; height: 1px; background: var(--accent);
}

/* ---------- Project cards ---------- */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}
.card {
  background: var(--bg-soft);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  padding: 24px;
  transition: all .25s var(--ease);
  position: relative;
  overflow: hidden;
}
.card::before {
  content: "";
  position: absolute; inset: 0;
  background: radial-gradient(600px circle at var(--x, 50%) var(--y, 0%), color-mix(in oklab, var(--accent) 12%, transparent), transparent 40%);
  opacity: 0; transition: opacity .3s var(--ease);
  pointer-events: none;
}
.card:hover { border-color: var(--accent); transform: translateY(-2px); }
.card:hover::before { opacity: 1; }
.card h3 {
  margin: 0 0 8px;
  font-size: 16px; font-weight: 600;
  display: flex; align-items: center; gap: 8px;
}
.card h3 svg { color: var(--fg-mute); }
.card p { margin: 0 0 16px; color: var(--fg-soft); font-size: 14px; }
.card-meta {
  display: flex; gap: 16px; align-items: center;
  font-size: 12px; color: var(--fg-mute);
  font-family: var(--font-mono);
}
.lang-dot {
  width: 10px; height: 10px; border-radius: 50%;
  display: inline-block; margin-right: 6px;
}

/* ---------- Post list ---------- */
.posts { display: flex; flex-direction: column; gap: 4px; }
.post-item {
  display: flex; justify-content: space-between; gap: 24px;
  padding: 18px 16px;
  border-radius: 8px;
  border: 1px solid transparent;
  transition: all .2s var(--ease);
}
.post-item:hover {
  border-color: var(--border-soft);
  background: var(--bg-soft);
}
.post-item h4 { margin: 0 0 6px; color: var(--fg); font-size: 16px; font-weight: 500; }
.post-item p  { margin: 0; color: var(--fg-mute); font-size: 13px; }
.post-item time {
  font-family: var(--font-mono);
  color: var(--fg-mute);
  font-size: 13px;
  white-space: nowrap;
}

/* ---------- Footer ---------- */
.footer {
  border-top: 1px solid var(--border-soft);
  padding: 40px 0;
  color: var(--fg-mute);
  font-size: 13px;
  font-family: var(--font-mono);
  text-align: center;
}
.footer a { color: var(--fg-soft); }

/* =========================================================
   Article page
   ========================================================= */
.article {
  padding: 64px 0 96px;
}
.article-header { margin-bottom: 40px; }
.back-link {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--fg-mute);
  display: inline-flex; align-items: center; gap: 6px;
  margin-bottom: 24px;
}
.back-link:hover { color: var(--accent); }
.article h1 {
  font-size: clamp(28px, 4vw, 42px);
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin: 0 0 16px;
}
.article-meta {
  display: flex; gap: 16px; flex-wrap: wrap;
  color: var(--fg-mute);
  font-size: 13px;
  font-family: var(--font-mono);
}
.tag {
  display: inline-block;
  padding: 2px 10px;
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 12px;
  color: var(--fg-soft);
}

.prose { max-width: 720px; }
.prose h2 {
  font-size: 24px;
  margin: 56px 0 16px;
  padding-left: 14px;
  border-left: 3px solid var(--accent);
  letter-spacing: -.01em;
}
.prose h3 { font-size: 18px; margin: 32px 0 12px; }
.prose p  { color: var(--fg-soft); margin: 14px 0; }
.prose ul, .prose ol { color: var(--fg-soft); padding-left: 22px; }
.prose li { margin: 6px 0; }
.prose blockquote {
  border-left: 3px solid var(--accent-2);
  background: var(--bg-soft);
  margin: 20px 0;
  padding: 14px 18px;
  border-radius: 0 8px 8px 0;
  color: var(--fg-soft);
}

/* Inline code */
.prose code {
  font-family: var(--font-mono);
  font-size: .92em;
  background: var(--bg-soft);
  border: 1px solid var(--border-soft);
  padding: 2px 6px;
  border-radius: 4px;
  color: var(--accent-3);
}

/* Code block (terminal) */
.codeblock {
  position: relative;
  margin: 24px 0;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-elev);
  overflow: hidden;
  box-shadow: var(--shadow);
}
.codeblock-head {
  display: flex; align-items: center; gap: 8px;
  padding: 10px 14px;
  background: var(--bg-soft);
  border-bottom: 1px solid var(--border-soft);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--fg-mute);
}
.dot { width: 12px; height: 12px; border-radius: 50%; }
.dot.r { background: #ff5f57; } .dot.y { background: #febc2e; } .dot.g { background: #28c840; }
.codeblock-title { margin-left: 8px; }
.copy-btn {
  margin-left: auto;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--fg-mute);
  font-family: var(--font-mono);
  font-size: 11px;
  padding: 4px 10px;
  border-radius: 6px;
  cursor: pointer;
  transition: all .2s var(--ease);
}
.copy-btn:hover { color: var(--accent); border-color: var(--accent); }
.codeblock pre {
  margin: 0;
  padding: 18px 20px;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--fg);
}
/* light syntax coloring */
.tok-k { color: var(--accent-2); }   /* keyword */
.tok-s { color: var(--accent); }     /* string */
.tok-c { color: var(--fg-mute); font-style: italic; } /* comment */
.tok-f { color: var(--accent-3); }   /* function */
.tok-n { color: #d2a8ff; }           /* number/constant */

/* Feature grid in article */
.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
  margin: 24px 0;
}
.feature {
  padding: 18px;
  border: 1px solid var(--border-soft);
  border-radius: 10px;
  background: var(--bg-soft);
}
.feature .ico {
  width: 32px; height: 32px; border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  background: color-mix(in oklab, var(--accent) 18%, transparent);
  color: var(--accent);
  margin-bottom: 10px;
}
.feature h4 { margin: 0 0 6px; font-size: 14px; }
.feature p  { margin: 0; font-size: 13px; color: var(--fg-mute); }

/* Demo / image preview */
.demo {
  margin: 28px 0;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--bg-soft);
}
.demo .caption {
  padding: 10px 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--fg-mute);
  border-top: 1px solid var(--border-soft);
  text-align: center;
}
.demo-frame {
  aspect-ratio: 16 / 9;
  background:
    radial-gradient(1200px circle at 20% 10%, rgba(126,231,135,.12), transparent 40%),
    radial-gradient(1200px circle at 80% 90%, rgba(121,192,255,.1), transparent 40%),
    var(--bg-elev);
  display: flex; align-items: center; justify-content: center;
  color: var(--fg-mute);
  font-family: var(--font-mono);
  font-size: 13px;
  position: relative;
}
.demo-frame::after {
  content: "▍";
  color: var(--accent);
  animation: blink 1.2s steps(2) infinite;
  margin-left: 4px;
}

/* Responsive tweaks */
@media (max-width: 640px) {
  .hero { padding: 64px 0 40px; }
  .section { padding: 56px 0; }
  .nav-links { gap: 18px; }
  .nav-links a:not(.theme-toggle) { display: none; }
  .post-item { flex-direction: column; gap: 4px; }
}

/* Fade-in on load */
.reveal { opacity: 0; transform: translateY(12px); transition: opacity .6s var(--ease), transform .6s var(--ease); }
.reveal.in { opacity: 1; transform: none; }