/* ==========================================================================
   Green Software in Switzerland — site styles
   Colors: forest green (sustainability) + teal/cyan (information technology)
   System fonts only: no external requests, fast and lightweight.
   ========================================================================== */

:root {
  --green-950: #062a20;
  --green-900: #0b3d2e;
  --green-800: #0f5139;
  --green-700: #14674a;
  --green-500: #1f9d6b;
  --green-300: #7fd1a8;
  --green-100: #e3f4ea;
  --teal-500: #0ea5a4;
  --teal-300: #5eead4;
  --cyan-100: #e0f7f6;

  --bg: #f6faf7;
  --surface: #ffffff;
  --ink: #0f1f1a;
  --muted: #56675f;
  --border: #dce8e1;
  --accent: var(--green-700);
  --accent-2: var(--teal-500);
  --link: #0c6b4c;
  --quote-bg: #eef7f1;
  --shadow: 0 1px 2px rgb(6 42 32 / 6%), 0 8px 24px rgb(6 42 32 / 6%);
  --shadow-hover: 0 2px 4px rgb(6 42 32 / 8%), 0 16px 40px rgb(6 42 32 / 12%);

  --font-sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, "SF Mono", "Cascadia Code", "Roboto Mono", Menlo, Consolas, monospace;

  --radius: 14px;
  --container: 1120px;
  --prose: 70ch;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #07140f;
    --surface: #0d1f18;
    --ink: #e6f2ec;
    --muted: #9db3a8;
    --border: #1d3a2e;
    --accent: var(--green-300);
    --link: #7fd1a8;
    --quote-bg: #0f281e;
    --green-100: #12372a;
    --cyan-100: #0f3332;
    --shadow: 0 1px 2px rgb(0 0 0 / 30%), 0 8px 24px rgb(0 0 0 / 25%);
    --shadow-hover: 0 2px 4px rgb(0 0 0 / 35%), 0 16px 40px rgb(0 0 0 / 35%);
  }
}

/* ---------- Base ---------- */
*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 1.0625rem;
  line-height: 1.65;
  color: var(--ink);
  background: var(--bg);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

main { flex: 1; }

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

a { color: var(--link); text-underline-offset: 3px; text-decoration-thickness: 1px; }
a:hover { text-decoration-thickness: 2px; }

:focus-visible { outline: 3px solid var(--teal-500); outline-offset: 3px; border-radius: 4px; }

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 1.25rem;
}

.skip-link {
  position: absolute; left: -999px; top: 0.5rem;
  background: var(--surface); color: var(--ink); padding: 0.5rem 1rem; z-index: 100;
}
.skip-link:focus { left: 0.5rem; }

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  backdrop-filter: saturate(160%) blur(10px);
  -webkit-backdrop-filter: saturate(160%) blur(10px);
  border-bottom: 1px solid var(--border);
}

.site-header .container {
  display: flex; align-items: center; justify-content: space-between;
  height: 64px; gap: 1rem;
}

.brand {
  display: inline-flex; align-items: center; gap: 0.6rem;
  color: var(--ink); text-decoration: none; font-weight: 700; letter-spacing: -0.01em;
}
.brand-logo { width: 32px; height: 32px; flex: none; color: var(--green-500); }
.brand-text { line-height: 1.15; font-size: 1rem; }
.brand-text small {
  display: block; font-family: var(--font-mono); font-weight: 500;
  font-size: 0.68rem; color: var(--muted); letter-spacing: 0.06em; text-transform: uppercase;
}

.site-nav ul { display: flex; gap: 0.25rem; list-style: none; margin: 0; padding: 0; }
.site-nav a {
  display: block; padding: 0.45rem 0.85rem; border-radius: 999px;
  color: var(--muted); text-decoration: none; font-weight: 550; font-size: 0.95rem;
}
.site-nav a:hover { color: var(--ink); background: var(--green-100); }
.site-nav a[aria-current="page"] { color: var(--accent); background: var(--green-100); }

/* ---------- Hero ---------- */
.hero {
  position: relative; overflow: hidden; color: #eafff4;
  background:
    radial-gradient(1200px 400px at 85% -10%, rgb(14 165 164 / 35%), transparent 60%),
    radial-gradient(800px 400px at -10% 110%, rgb(31 157 107 / 35%), transparent 60%),
    linear-gradient(160deg, var(--green-900), var(--green-950));
}
/* subtle circuit-board grid */
.hero::before {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background-image:
    linear-gradient(rgb(255 255 255 / 5%) 1px, transparent 1px),
    linear-gradient(90deg, rgb(255 255 255 / 5%) 1px, transparent 1px);
  background-size: 32px 32px;
  mask-image: linear-gradient(to bottom, black, transparent 95%);
  -webkit-mask-image: linear-gradient(to bottom, black, transparent 95%);
}

.hero .container {
  position: relative; display: grid; grid-template-columns: 1.3fr 1fr;
  align-items: center; gap: 2rem; padding-top: 4.5rem; padding-bottom: 4.5rem;
}

.eyebrow {
  display: inline-flex; align-items: center; gap: 0.5rem;
  font-family: var(--font-mono); font-size: 0.78rem; letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--teal-300);
}
.eyebrow::before {
  content: ""; width: 8px; height: 8px; border-radius: 50%;
  background: var(--green-300); box-shadow: 0 0 0 4px rgb(127 209 168 / 20%);
}

.hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.6rem); line-height: 1.05; letter-spacing: -0.03em;
  margin: 0.9rem 0 1rem; color: #fff;
}
.hero h1 .accent {
  background: linear-gradient(90deg, var(--green-300), var(--teal-300));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero p.lead { font-size: 1.15rem; color: #c4e6d6; max-width: 38rem; margin: 0 0 1.75rem; }

.btn {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.75rem 1.2rem; border-radius: 999px; font-weight: 600; text-decoration: none;
  transition: transform .15s ease, background .15s ease;
}
.btn-primary { background: var(--green-300); color: var(--green-950); }
.btn-primary:hover { background: #9be0bc; transform: translateY(-1px); }
.btn-ghost { color: #eafff4; border: 1px solid rgb(255 255 255 / 25%); }
.btn-ghost:hover { background: rgb(255 255 255 / 8%); }
.hero-actions { display: flex; flex-wrap: wrap; gap: 0.75rem; }

.hero-art { justify-self: center; width: min(100%, 360px); }
.hero-art svg { width: 100%; height: auto; filter: drop-shadow(0 20px 40px rgb(0 0 0 / 30%)); }

/* ---------- Sections ---------- */
.section { padding: 4rem 0; }
.section-head {
  display: flex; align-items: end; justify-content: space-between; gap: 1rem; margin-bottom: 1.75rem;
}
.section-head h2 { margin: 0; font-size: 1.75rem; letter-spacing: -0.02em; }
.section-head p { margin: 0.25rem 0 0; color: var(--muted); }

/* ---------- Article cards ---------- */
.post-grid {
  display: grid; gap: 1.5rem;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
}

.post-card {
  position: relative; display: flex; flex-direction: column;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  overflow: hidden; box-shadow: var(--shadow);
  transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
}
.post-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-hover); border-color: var(--green-300); }

.post-card--featured { grid-column: 1 / -1; display: grid; grid-template-columns: 1fr 1.2fr; }
.post-card--featured .card-cover { aspect-ratio: auto; min-height: 260px; }
.post-card--featured .card-body { padding: 2rem; justify-content: center; }
.post-card--featured h3 { font-size: 1.6rem; }

.card-body { display: flex; flex-direction: column; gap: 0.6rem; padding: 1.4rem; flex: 1; }
.card-body h3 { margin: 0; font-size: 1.25rem; line-height: 1.3; letter-spacing: -0.01em; }
.card-body h3 a { color: var(--ink); text-decoration: none; }
/* make the whole card clickable */
.card-body h3 a::after { content: ""; position: absolute; inset: 0; }
.card-body p { margin: 0; color: var(--muted); font-size: 0.98rem; }

.post-meta {
  display: flex; flex-wrap: wrap; align-items: center; gap: 0.4rem 0.9rem;
  font-family: var(--font-mono); font-size: 0.78rem; color: var(--muted);
}
.card-body .post-meta { margin-top: auto; padding-top: 0.6rem; }

.badge {
  display: inline-block; font-family: var(--font-mono); font-size: 0.72rem; font-weight: 600;
  letter-spacing: 0.04em; text-transform: uppercase;
  padding: 0.2rem 0.55rem; border-radius: 999px;
  background: var(--green-100); color: var(--accent);
}
.badge--teal { background: var(--cyan-100); color: var(--teal-500); }
.badges { display: flex; flex-wrap: wrap; gap: 0.4rem; }

/* Generated card covers — pick one per category (theory / criteria / education / default) */
.card-cover {
  position: relative; aspect-ratio: 16 / 8; overflow: hidden; display: grid; place-items: center;
  color: rgb(255 255 255 / 92%);
  background: linear-gradient(135deg, var(--green-700), var(--teal-500));
}
.card-cover::before {
  content: ""; position: absolute; inset: 0;
  background-image:
    radial-gradient(circle at 1px 1px, rgb(255 255 255 / 22%) 1px, transparent 0);
  background-size: 18px 18px;
}
.card-cover svg { position: relative; width: 84px; height: 84px; }
.cover--theory    { background: linear-gradient(135deg, #0b3d2e 0%, #1f9d6b 60%, #7fd1a8 100%); }
.cover--criteria  { background: linear-gradient(135deg, #0b3d2e 0%, #0e7c7b 55%, #0ea5a4 100%); }
.cover--education { background: linear-gradient(135deg, #12372a 0%, #3a8f5c 55%, #a3c95f 100%); }

/* ---------- Topics strip ---------- */
.pillars { display: grid; gap: 1rem; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); }
.pillar {
  padding: 1.1rem 1.2rem; border-radius: var(--radius); background: var(--surface);
  border: 1px solid var(--border);
}
.pillar strong { display: block; margin-bottom: 0.2rem; }
.pillar span { color: var(--muted); font-size: 0.92rem; }
.pillar .dot {
  display: inline-block; width: 10px; height: 10px; border-radius: 3px; margin-right: 0.45rem;
  background: var(--green-500); vertical-align: 1px;
}

/* ---------- Article page ---------- */
.article-header {
  background:
    radial-gradient(900px 300px at 90% -20%, rgb(14 165 164 / 18%), transparent 60%),
    linear-gradient(180deg, var(--green-100), var(--bg));
  border-bottom: 1px solid var(--border);
  padding: 3.5rem 0 2.5rem;
}
.article-header .container, .prose-wrap { max-width: calc(var(--prose) + 2.5rem); }
.article-header h1 {
  font-size: clamp(2rem, 4.5vw, 2.9rem); line-height: 1.12; letter-spacing: -0.025em; margin: 0.9rem 0 1rem;
}
.back-link {
  display: inline-flex; align-items: center; gap: 0.35rem;
  font-family: var(--font-mono); font-size: 0.82rem; color: var(--muted); text-decoration: none;
}
.back-link:hover { color: var(--accent); }

.prose-wrap { margin: 0 auto; padding: 2.5rem 1.25rem 4rem; }

.prose { font-size: 1.1rem; }
.prose > * + * { margin-top: 1.15em; }
.prose p, .prose ul, .prose ol { margin-bottom: 0; }
.prose h2 {
  font-size: 1.55rem; line-height: 1.25; letter-spacing: -0.015em; margin: 2.2em 0 0;
  padding-left: 0.85rem; border-left: 4px solid var(--green-500);
}
.prose h3 { font-size: 1.25rem; margin: 1.8em 0 0; }
.prose ul, .prose ol { padding-left: 1.3em; }
.prose li + li { margin-top: 0.5em; }
.prose li::marker { color: var(--green-500); }
.prose em { color: var(--accent); font-style: normal; font-weight: 600; }

.prose blockquote {
  margin: 1.8em 0; padding: 1.4rem 1.6rem; border-radius: var(--radius);
  background: var(--quote-bg); border-left: 4px solid var(--teal-500);
  font-size: 1.2rem; line-height: 1.5;
}
.prose blockquote p { margin: 0; }
.prose blockquote cite {
  display: block; margin-top: 0.8rem; font-size: 0.85rem; font-style: normal; color: var(--muted);
}

.prose figure { margin: 2em 0; }
.prose figure img {
  margin: 0 auto; border-radius: 10px; border: 1px solid var(--border); background: #fff;
}
.prose figcaption { margin-top: 0.7rem; font-size: 0.88rem; color: var(--muted); text-align: center; }

/* Placeholder shown when an image file has not been added yet (see assets/js/main.js) */
.img-placeholder { display: none; }
figure.is-missing img { display: none; }
figure.is-missing .img-placeholder {
  display: grid; place-items: center; gap: 0.4rem; text-align: center;
  min-height: 220px; padding: 1.5rem; border-radius: 10px;
  border: 2px dashed var(--border); color: var(--muted); background: var(--surface);
  font-family: var(--font-mono); font-size: 0.85rem;
}

.callout {
  padding: 1.1rem 1.3rem; border-radius: var(--radius);
  background: var(--cyan-100); border: 1px solid color-mix(in srgb, var(--teal-500) 30%, transparent);
}

.article-footer {
  margin-top: 3rem; padding-top: 1.5rem; border-top: 1px solid var(--border);
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 1rem;
}

/* ---------- Footer ---------- */
.site-footer {
  margin-top: auto; background: var(--green-950); color: #b5d3c5; font-size: 0.92rem;
}
.site-footer .container {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between;
  gap: 1rem; padding-top: 2rem; padding-bottom: 2rem;
}
.site-footer a { color: #d9f3e6; text-decoration: none; }
.site-footer a:hover { text-decoration: underline; }
.site-footer ul { display: flex; gap: 1.25rem; list-style: none; margin: 0; padding: 0; }
.footer-note { font-family: var(--font-mono); font-size: 0.78rem; color: #7fa594; }

/* ---------- Responsive ---------- */
@media (max-width: 820px) {
  .hero .container { grid-template-columns: 1fr; padding-top: 3rem; padding-bottom: 3rem; }
  .hero-art { display: none; }
  .post-card--featured { grid-template-columns: 1fr; }
  .post-card--featured .card-cover { min-height: 180px; }
  .post-card--featured .card-body { padding: 1.4rem; }
}

@media (max-width: 560px) {
  .brand-text small { display: none; }
  .site-nav a { padding: 0.45rem 0.6rem; }
  .post-grid { grid-template-columns: 1fr; }
  .section { padding: 3rem 0; }
}

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