/* Skillberry — palette drawn from the logo: blueberry navy, cream, leaf green. */

:root {
  --bg: #f7f4ec;
  --bg-elev: #fffdf8;
  --bg-sunk: #efeadd;
  --text: #1c2340;
  --text-muted: #5a6180;
  --border: #e2dccb;
  --accent: #34407a;       /* blueberry */
  --accent-strong: #252f63;
  --accent-soft: #e4e7f5;
  --leaf: #4f8a4b;
  --code-bg: #1d2338;
  --code-text: #e6e9f5;
  --shadow: 0 1px 2px rgb(28 35 64 / 0.06), 0 4px 16px rgb(28 35 64 / 0.06);
  --radius: 14px;
  --font-sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "JetBrains Mono", Menlo, Consolas, monospace;
  color-scheme: light;
}

/* Dark: explicit choice, or "system" when the OS prefers dark. */
:root[data-theme="dark"] {
  --bg: #0f1420;
  --bg-elev: #161c2c;
  --bg-sunk: #0b0f18;
  --text: #e6e9f5;
  --text-muted: #9aa3c0;
  --border: #262e45;
  --accent: #9aa8ff;
  --accent-strong: #c2cbff;
  --accent-soft: #1f2744;
  --leaf: #7cc17a;
  --code-bg: #0b0f18;
  --code-text: #e6e9f5;
  --shadow: 0 1px 2px rgb(0 0 0 / 0.3), 0 6px 20px rgb(0 0 0 / 0.25);
  color-scheme: dark;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0f1420;
    --bg-elev: #161c2c;
    --bg-sunk: #0b0f18;
    --text: #e6e9f5;
    --text-muted: #9aa3c0;
    --border: #262e45;
    --accent: #9aa8ff;
    --accent-strong: #c2cbff;
    --accent-soft: #1f2744;
    --leaf: #7cc17a;
    --code-bg: #0b0f18;
    --code-text: #e6e9f5;
    --shadow: 0 1px 2px rgb(0 0 0 / 0.3), 0 6px 20px rgb(0 0 0 / 0.25);
    color-scheme: dark;
  }
}

/* ---------- base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.6 var(--font-sans);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}
main { flex: 1; }
img { max-width: 100%; height: auto; }
a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--accent-strong); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 4px; }
h1, h2, h3 { line-height: 1.25; letter-spacing: -0.01em; }
code, pre { font-family: var(--font-mono); font-size: 0.9em; }
:not(pre) > code { background: var(--accent-soft); padding: 0.1em 0.35em; border-radius: 5px; }
pre {
  background: var(--code-bg);
  color: var(--code-text);
  padding: 1rem 1.1rem;
  border-radius: 10px;
  overflow-x: auto;
  line-height: 1.5;
}
pre code { background: none; padding: 0; }
table { border-collapse: collapse; width: 100%; font-size: 0.95em; margin: 1rem 0; }
th, td { text-align: left; padding: 0.55rem 0.7rem; border-bottom: 1px solid var(--border); }
th { color: var(--text-muted); font-weight: 600; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.skip-link { position: absolute; left: -999px; top: 0; background: var(--accent); color: #fff; padding: 0.5rem 1rem; z-index: 100; }
.skip-link:focus { left: 1rem; }

.container { width: min(1120px, 100% - 2.5rem); margin-inline: auto; }

/* ---------- header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 10;
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  backdrop-filter: saturate(1.4) blur(10px);
  border-bottom: 1px solid var(--border);
}
.header-inner { display: flex; align-items: center; gap: 1.25rem; height: 64px; }
.brand { display: flex; align-items: center; gap: 0.6rem; font-weight: 700; font-size: 1.1rem; color: var(--text); text-decoration: none; }
.brand img { border-radius: 9px; }
.site-nav { display: flex; align-items: center; gap: 0.25rem; margin-left: auto; }
.site-nav a { color: var(--text-muted); text-decoration: none; padding: 0.4rem 0.7rem; border-radius: 8px; font-weight: 500; }
.site-nav a:hover { color: var(--text); background: var(--accent-soft); }
.site-nav a[aria-current="page"] { color: var(--accent); background: var(--accent-soft); }
.nav-gh { display: inline-flex; }

.theme-switch { display: inline-flex; padding: 3px; gap: 2px; background: var(--bg-sunk); border: 1px solid var(--border); border-radius: 999px; }
.theme-switch button {
  border: 0; background: transparent; cursor: pointer; font-size: 0.9rem; line-height: 1;
  padding: 0.35rem 0.5rem; border-radius: 999px; filter: grayscale(1); opacity: 0.6;
}
.theme-switch button:hover { opacity: 1; }
.theme-switch button[aria-pressed="true"] { background: var(--bg-elev); box-shadow: var(--shadow); filter: none; opacity: 1; }

/* ---------- hero ---------- */
.hero { padding: 4.5rem 0 3rem; border-bottom: 1px solid var(--border); }
.hero-inner { display: grid; grid-template-columns: 1fr auto; gap: 3rem; align-items: center; }
.hero h1 { font-size: clamp(2.2rem, 5vw, 3.4rem); margin: 0.3rem 0 1rem; }
.hero .accent { color: var(--accent); }
.hero-logo { border-radius: 28px; box-shadow: var(--shadow); }
.eyebrow { font-family: var(--font-mono); font-size: 0.85rem; color: var(--leaf); margin: 0; }
.lead { font-size: 1.15rem; color: var(--text-muted); max-width: 62ch; }
.lead strong { color: var(--text); }
.hero-points { list-style: none; padding: 0; margin: 1rem 0 0; display: grid; gap: 0.5rem; max-width: 62ch; color: var(--text-muted); }
.hero-points li { position: relative; padding-left: 1.6rem; }
.hero-points li::before { content: "🫐"; position: absolute; left: 0; top: 0.05em; font-size: 0.9em; }
.actions { display: flex; flex-wrap: wrap; gap: 0.6rem; margin: 1.5rem 0 0; }

.btn {
  display: inline-flex; align-items: center; gap: 0.45rem;
  padding: 0.6rem 1rem; border-radius: 10px; font-weight: 600; text-decoration: none;
  border: 1px solid var(--border); background: var(--bg-elev); color: var(--text);
}
.btn:hover { border-color: var(--accent); color: var(--accent); }
.btn-primary { background: var(--accent); border-color: var(--accent); color: var(--bg); }
.btn-primary:hover { background: var(--accent-strong); color: var(--bg); }

/* ---------- sections & cards ---------- */
.section { padding: 3rem 0; }
.section-head { display: flex; align-items: baseline; justify-content: space-between; gap: 1rem; margin-bottom: 1.25rem; }
.section-head h2 { margin: 0; font-size: 1.6rem; }
.grid { display: grid; gap: 1.1rem; }
.grid-3 { grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); }

.pillars { padding-top: 2.5rem; padding-bottom: 0; }
.pillar h2 { font-size: 1.15rem; margin: 0.4rem 0 0.25rem; }
.pillar p { margin: 0; color: var(--text-muted); }
.pillar .emoji { font-size: 1.6rem; }

.card {
  position: relative;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem 1.35rem;
  box-shadow: var(--shadow);
}
.card h3 { margin: 0 0 0.4rem; font-size: 1.15rem; }
.card h3 a { color: var(--text); text-decoration: none; }
.card p { margin: 0.3rem 0; }
.card-title { font-size: 1rem; margin: 0 0 0.75rem; }

.project-card { display: flex; flex-direction: column; transition: border-color 0.15s, transform 0.15s; }
.project-card:hover { border-color: var(--accent); transform: translateY(-2px); }
.project-card h3 { font-family: var(--font-mono); }
.project-card > p:not(.card-links) { color: var(--text-muted); flex: 1; }
/* Whole card is clickable via the title link; other links sit above it. */
.stretched::after { content: ""; position: absolute; inset: 0; border-radius: var(--radius); }
.card-links { display: flex; flex-wrap: wrap; gap: 1rem; margin-top: 0.75rem !important; font-size: 0.92rem; }
.card-links a { position: relative; z-index: 1; display: inline-flex; align-items: center; gap: 0.35rem; text-decoration: none; font-weight: 500; }
.card-links svg { width: 16px; height: 16px; }

.tags { display: flex; flex-wrap: wrap; gap: 0.35rem; list-style: none; padding: 0; margin: 0.6rem 0 0; }
.tags li { font-family: var(--font-mono); font-size: 0.75rem; color: var(--leaf); background: color-mix(in srgb, var(--leaf) 12%, transparent); padding: 0.1rem 0.5rem; border-radius: 999px; }

.meta { color: var(--text-muted); font-size: 0.85rem; font-family: var(--font-mono); }

/* blog */
.blog-list { display: grid; gap: 1.1rem; }
.blog-card { display: grid; grid-template-columns: 320px 1fr; gap: 1.5rem; align-items: center; }
.blog-image { display: block; background: #fff; border-radius: 10px; overflow: hidden; border: 1px solid var(--border); }
.blog-image img { display: block; width: 100%; aspect-ratio: 16 / 10; object-fit: contain; }
.blog-card h3 { font-size: 1.25rem; }
.abstract { color: var(--text-muted); }

/* youtube */
.yt-grid { grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); }
.yt-card { padding: 0.75rem; }
.yt-card h3 { font-size: 0.98rem; margin-top: 0.6rem; }
.yt-thumb { position: relative; display: block; border-radius: 9px; overflow: hidden; background: var(--bg-sunk); aspect-ratio: 16 / 9; }
.yt-thumb img { width: 100%; height: 100%; object-fit: cover; display: block; }
.yt-badge { position: absolute; left: 0.5rem; bottom: 0.5rem; background: rgb(0 0 0 / 0.75); color: #fff; font-size: 0.75rem; padding: 0.15rem 0.5rem; border-radius: 6px; }
.empty-state { text-align: center; padding: 2rem; color: var(--text-muted); }
.empty-state p:first-child { font-size: 1.1rem; color: var(--text); }

/* ---------- inner pages ---------- */
.page-hero { padding: 3rem 0 2rem; border-bottom: 1px solid var(--border); }
.page-hero h1 { font-size: clamp(1.9rem, 4vw, 2.6rem); margin: 0.2rem 0 0.5rem; }
.page-body { padding: 2.25rem 0 3.5rem; }
.breadcrumb { margin: 0; font-family: var(--font-mono); font-size: 0.85rem; }
.subhead { font-size: 1.3rem; margin-top: 2.5rem; }
.more { margin-top: 2rem; color: var(--text-muted); }

.facts { display: flex; flex-wrap: wrap; gap: 0.5rem 1.75rem; list-style: none; padding: 0; margin: 1.75rem 0 0; font-size: 0.92rem; }
.facts span { display: block; font-family: var(--font-mono); font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--text-muted); }

.project-body { display: grid; grid-template-columns: minmax(0, 1fr) 380px; gap: 2.5rem; align-items: start; }
.prose { max-width: 72ch; min-width: 0; }
.prose > :first-child { margin-top: 0; }
.highlights { padding-left: 1.2rem; }
.highlights li { margin: 0.45rem 0; }
.highlights li::marker { content: "🫐  "; font-size: 0.85em; }
.sidebar { display: grid; gap: 1.1rem; position: sticky; top: 84px; min-width: 0; }
.sidebar .card { min-width: 0; }
.install { margin: 0; font-size: 0.8rem; white-space: pre; }
.plain { list-style: none; padding: 0; margin: 0; display: grid; gap: 0.5rem; }

/* ---------- footer ---------- */
.site-footer { border-top: 1px solid var(--border); padding: 1.5rem 0; color: var(--text-muted); font-size: 0.9rem; }
.footer-inner { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 0.5rem 1rem; }
.footer-inner p { margin: 0; }
.footer-links { display: flex; gap: 1rem; }

/* ---------- responsive ---------- */
@media (max-width: 900px) {
  .project-body { grid-template-columns: 1fr; }
  .sidebar { position: static; }
}
@media (max-width: 760px) {
  .hero-inner { grid-template-columns: 1fr; }
  .hero-logo { width: 140px; height: 140px; order: -1; }
  .blog-card { grid-template-columns: 1fr; }
  .header-inner { flex-wrap: wrap; height: auto; padding: 0.6rem 0; gap: 0.5rem; }
  .site-nav { order: 3; width: 100%; margin-left: 0; overflow-x: auto; }
  .theme-switch { margin-left: auto; }
}
@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
}