/* PetriKey — microbiology study bench landing site
   Palette derived from the app icon: deep teal -> medical blue, mint & teal nodes. */

:root {
  --bg: #f4f9f8;
  --bg-tint: #e7f3f0;
  --surface: #ffffff;
  --surface-2: #f0f7f5;
  --ink: #10201d;
  --muted: #4b5f5b;
  --faint: #6c807b;
  --teal-deep: #0f766e;
  --teal: #0c8577;
  --teal-bright: #14b8a6;
  --mint: #d8efe9;
  --blue: #2563eb;
  --blue-soft: #dbe6fb;
  --amber: #b45309;
  --border: #d5e4e0;
  --border-strong: #bcd2cc;
  --ring: #14b8a6;
  --shadow: 0 1px 2px rgba(15, 40, 35, .05), 0 8px 24px -12px rgba(15, 40, 35, .18);
  --shadow-lift: 0 2px 4px rgba(15, 40, 35, .06), 0 18px 40px -16px rgba(15, 40, 35, .28);
  --radius-s: 10px;
  --radius: 16px;
  --radius-l: 24px;
  --maxw: 1080px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0a1413;
    --bg-tint: #0f1e1b;
    --surface: #11201d;
    --surface-2: #16292500;
    --surface-2: #152622;
    --ink: #e9f4f1;
    --muted: #a3b7b2;
    --faint: #8299938a;
    --faint: #8ba39d;
    --teal-deep: #2dd4bf;
    --teal: #35d6c1;
    --teal-bright: #5eead4;
    --mint: #17332d;
    --blue: #6ea8fe;
    --blue-soft: #17273f;
    --amber: #fbbf7a;
    --border: #23372f;
    --border-strong: #2f4840;
    --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 10px 30px -14px rgba(0, 0, 0, .6);
    --shadow-lift: 0 2px 4px rgba(0, 0, 0, .35), 0 20px 46px -18px rgba(0, 0, 0, .7);
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.62;
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 { line-height: 1.16; letter-spacing: -.02em; margin: 0 0 .4em; font-weight: 700; }
h1 { font-size: clamp(2rem, 5.2vw, 3.15rem); letter-spacing: -.03em; }
h2 { font-size: clamp(1.5rem, 3.4vw, 2.1rem); }
h3 { font-size: 1.16rem; letter-spacing: -.01em; }
p { margin: 0 0 1rem; }
a { color: var(--teal-deep); }

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

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }

.skip {
  position: absolute; left: -999px; top: 0; z-index: 100;
  background: var(--teal-deep); color: #fff; padding: 10px 16px; border-radius: 0 0 8px 0;
}
.skip:focus { left: 0; }

:focus-visible { outline: 3px solid var(--ring); outline-offset: 2px; border-radius: 4px; }

/* ---------- Buttons / badges ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  font-weight: 600; font-size: .98rem; text-decoration: none;
  padding: 12px 20px; border-radius: 12px; border: 1px solid transparent;
  cursor: pointer; transition: transform .12s ease, box-shadow .12s ease, background .12s ease;
}
.btn-primary { background: var(--teal-deep); color: #fff; box-shadow: var(--shadow); }
.btn-primary:hover { transform: translateY(-1px); box-shadow: var(--shadow-lift); }
.btn-ghost { background: transparent; color: var(--ink); border-color: var(--border-strong); }
.btn-ghost:hover { background: var(--surface-2); }
@media (prefers-reduced-motion: reduce) { .btn:hover { transform: none; } }

.playbadge {
  display: inline-flex; align-items: center; gap: 11px; text-decoration: none;
  background: #0d1b18; color: #fff; padding: 10px 18px; border-radius: 12px;
  border: 1px solid #24413a;
}
@media (prefers-color-scheme: dark) { .playbadge { background: #05100e; border-color: #24413a; } }
.playbadge:hover { background: #123029; }
.playbadge small { display: block; font-size: .62rem; letter-spacing: .14em; text-transform: uppercase; opacity: .8; line-height: 1.1; }
.playbadge strong { display: block; font-size: 1.12rem; font-weight: 600; letter-spacing: -.01em; }

.soon {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: .8rem; font-weight: 600; color: var(--teal-deep);
  background: var(--mint); border: 1px solid var(--border-strong);
  padding: 5px 13px; border-radius: 999px;
}
.soon::before { content: ""; width: 8px; height: 8px; border-radius: 50%; background: var(--teal-bright); box-shadow: 0 0 0 3px color-mix(in srgb, var(--teal-bright) 30%, transparent); }

/* ---------- Header ---------- */
.site-head {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--bg) 86%, transparent);
  backdrop-filter: saturate(1.4) blur(10px);
  border-bottom: 1px solid var(--border);
}
.site-head .wrap { display: flex; align-items: center; gap: 16px; height: 64px; }
.brand { display: flex; align-items: center; gap: 11px; font-weight: 700; letter-spacing: -.02em; text-decoration: none; color: var(--ink); font-size: 1.12rem; }
.brand img { width: 32px; height: 32px; border-radius: 8px; box-shadow: var(--shadow); }
.nav { margin-left: auto; display: flex; align-items: center; gap: 4px; }
.nav a { color: var(--muted); text-decoration: none; font-size: .95rem; font-weight: 500; padding: 8px 12px; border-radius: 8px; }
.nav a:hover { color: var(--ink); background: var(--surface-2); }
.nav a.nav-cta { margin-left: 6px; color: #fff; }
.nav a.nav-cta:hover { color: #fff; background: var(--teal-deep); }
@media (prefers-color-scheme: dark) {
  .nav a.nav-cta, .nav a.nav-cta:hover { color: #06231f; }
}
.nav-toggle { display: none; margin-left: auto; background: transparent; border: 1px solid var(--border-strong); border-radius: 10px; padding: 8px 10px; color: var(--ink); cursor: pointer; }

@media (max-width: 760px) {
  .nav-toggle { display: inline-flex; }
  .nav {
    position: absolute; top: 64px; left: 0; right: 0;
    flex-direction: column; align-items: stretch; gap: 2px;
    background: var(--bg); border-bottom: 1px solid var(--border);
    padding: 10px 16px 16px; margin-left: 0;
    display: none;
  }
  .nav.open { display: flex; }
  .nav a { padding: 12px 10px; }
  .nav-cta { margin: 6px 0 0; }
}

/* ---------- Hero ---------- */
.hero { padding: clamp(48px, 8vw, 92px) 0 clamp(40px, 6vw, 64px); position: relative; overflow: hidden; }
.hero::before {
  content: ""; position: absolute; inset: 0; z-index: -1;
  background:
    radial-gradient(900px 500px at 82% -8%, color-mix(in srgb, var(--blue) 12%, transparent), transparent 60%),
    radial-gradient(760px 480px at 6% 6%, color-mix(in srgb, var(--teal-bright) 16%, transparent), transparent 55%);
}
.hero-grid { display: grid; grid-template-columns: 1.15fr .85fr; gap: clamp(28px, 5vw, 60px); align-items: center; }
.hero-copy .soon { margin-bottom: 20px; }
.hero-copy p.lead { font-size: 1.16rem; color: var(--muted); max-width: 42ch; margin-bottom: 24px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; align-items: center; }
.hero-note { margin-top: 18px; font-size: .86rem; color: var(--faint); }

/* Hero device / atlas visual */
.hero-art { position: relative; }
.device {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-l);
  box-shadow: var(--shadow-lift); padding: 18px; max-width: 380px; margin: 0 auto;
}
.device .searchbar {
  display: flex; align-items: center; gap: 9px; background: var(--surface-2);
  border: 1px solid var(--border); border-radius: 12px; padding: 11px 13px; color: var(--faint); font-size: .92rem;
}
.device .searchbar svg { flex: none; }
.atlas-card {
  margin-top: 14px; background: var(--surface); border: 1px solid var(--border); border-radius: 14px; padding: 15px 16px;
  box-shadow: var(--shadow);
}
.atlas-card .eyebrow { font-size: .68rem; letter-spacing: .12em; text-transform: uppercase; color: var(--teal-deep); font-weight: 700; }
.atlas-card h3 { margin: 3px 0 4px; font-size: 1.18rem; }
.atlas-card .clue { font-size: .9rem; color: var(--muted); margin: 0 0 12px; }
.links { display: flex; flex-wrap: wrap; gap: 7px; }
.links span { font-size: .78rem; background: var(--mint); color: var(--teal-deep); padding: 4px 10px; border-radius: 8px; border: 1px solid var(--border-strong); }
.graph-line { margin-top: 12px; display: flex; align-items: center; gap: 8px; font-size: .8rem; color: var(--faint); }
.node { width: 11px; height: 11px; border-radius: 50%; flex: none; }
.node.teal { background: var(--teal-bright); }
.node.blue { background: var(--blue); }
.node.mint { background: var(--teal-deep); }
.dash { flex: 1; height: 1px; background: var(--border-strong); }

@media (max-width: 860px) {
  .hero-grid { grid-template-columns: 1fr; }
  .hero-art { order: -1; }
  .device { max-width: 340px; }
}

/* ---------- Trust strip ---------- */
.trust { border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); background: var(--surface); }
.trust ul { list-style: none; margin: 0; padding: 18px 0; display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.trust li { display: flex; align-items: center; gap: 10px; font-size: .92rem; font-weight: 500; color: var(--muted); }
.trust svg { flex: none; color: var(--teal-deep); }
@media (max-width: 700px) { .trust ul { grid-template-columns: repeat(2, 1fr); } }

/* ---------- Sections ---------- */
section { padding: clamp(52px, 8vw, 84px) 0; }
.section-head { max-width: 60ch; margin-bottom: 40px; }
.section-head .eyebrow { display: inline-block; font-size: .74rem; letter-spacing: .14em; text-transform: uppercase; color: var(--teal-deep); font-weight: 700; margin-bottom: 10px; }
.section-head p { color: var(--muted); font-size: 1.05rem; }
.alt { background: var(--bg-tint); }

/* Feature list — deliberately asymmetric, not a uniform card grid */
.features { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1px; background: var(--border); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; }
.feature { background: var(--surface); padding: 26px 24px; }
.feature .ic { width: 40px; height: 40px; border-radius: 11px; display: grid; place-items: center; background: var(--mint); color: var(--teal-deep); margin-bottom: 14px; }
.feature h3 { margin-bottom: 6px; }
.feature p { color: var(--muted); font-size: .95rem; margin: 0; }
@media (max-width: 700px) { .features { grid-template-columns: 1fr; } }

/* Numbers */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.stat { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 22px 20px; box-shadow: var(--shadow); }
.stat b { display: block; font-size: 2.1rem; letter-spacing: -.03em; color: var(--teal-deep); font-weight: 700; line-height: 1; }
.stat span { display: block; margin-top: 7px; font-size: .9rem; color: var(--muted); }
.stat-note { margin-top: 20px; font-size: .9rem; color: var(--faint); }
@media (max-width: 760px) { .stats { grid-template-columns: repeat(2, 1fr); } }

/* Steps */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; counter-reset: step; }
.step { position: relative; padding-top: 8px; }
.step .num { width: 34px; height: 34px; border-radius: 10px; background: var(--teal-deep); color: #fff; display: grid; place-items: center; font-weight: 700; margin-bottom: 14px; }
.step h3 { margin-bottom: 6px; }
.step p { color: var(--muted); font-size: .95rem; margin: 0; }
@media (max-width: 760px) { .steps { grid-template-columns: 1fr; gap: 26px; } }

/* Audience */
.aud { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.aud div { background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 16px 18px; font-weight: 600; display: flex; align-items: center; gap: 11px; }
.aud div span { width: 8px; height: 8px; border-radius: 50%; background: var(--teal-bright); flex: none; }
@media (max-width: 760px) { .aud { grid-template-columns: 1fr; } }

/* Plans */
.plans { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; align-items: start; }
.plan { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 28px 26px; box-shadow: var(--shadow); }
.plan.pro { border-color: var(--teal-deep); box-shadow: var(--shadow-lift); position: relative; }
.plan h3 { font-size: 1.3rem; }
.plan .tag { font-size: .7rem; letter-spacing: .1em; text-transform: uppercase; font-weight: 700; color: var(--teal-deep); }
.plan ul { list-style: none; margin: 16px 0 0; padding: 0; }
.plan li { display: flex; gap: 10px; align-items: flex-start; padding: 7px 0; font-size: .95rem; color: var(--muted); }
.plan li svg { flex: none; margin-top: 3px; color: var(--teal-deep); }
.plan .pricing { margin-top: 16px; font-size: .88rem; color: var(--faint); }
@media (max-width: 760px) { .plans { grid-template-columns: 1fr; } }

/* Guides */
.guide-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.guide-card { display: block; text-decoration: none; color: inherit; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; box-shadow: var(--shadow); transition: transform .12s ease, box-shadow .12s ease; }
.guide-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-lift); }
@media (prefers-reduced-motion: reduce) { .guide-card:hover { transform: none; } }
.guide-card .eyebrow { font-size: .7rem; letter-spacing: .12em; text-transform: uppercase; color: var(--teal-deep); font-weight: 700; }
.guide-card h3 { margin: 8px 0 6px; }
.guide-card p { color: var(--muted); font-size: .93rem; margin: 0; }
.guide-card .more { margin-top: 12px; font-size: .88rem; font-weight: 600; color: var(--teal-deep); }
@media (max-width: 700px) { .guide-grid { grid-template-columns: 1fr; } }

/* FAQ */
.faq { max-width: 780px; }
.faq details { border: 1px solid var(--border); border-radius: 12px; background: var(--surface); margin-bottom: 12px; overflow: hidden; }
.faq summary { cursor: pointer; padding: 18px 20px; font-weight: 600; list-style: none; display: flex; justify-content: space-between; align-items: center; gap: 16px; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary .chev { flex: none; transition: transform .18s ease; color: var(--teal-deep); }
.faq details[open] summary .chev { transform: rotate(180deg); }
.faq .answer { padding: 0 20px 18px; color: var(--muted); font-size: .96rem; }
@media (prefers-reduced-motion: reduce) { .faq summary .chev { transition: none; } }

/* CTA band */
.cta-band { text-align: center; background: linear-gradient(135deg, var(--teal-deep), #0b5f78 62%, var(--blue)); color: #fff; border-radius: var(--radius-l); padding: clamp(40px, 6vw, 64px) 24px; }
.cta-band h2 { color: #fff; }
.cta-band p { color: rgba(255, 255, 255, .88); max-width: 52ch; margin: 0 auto 26px; }
.cta-band .playbadge { background: rgba(255, 255, 255, .12); border-color: rgba(255, 255, 255, .28); }
.cta-band .playbadge:hover { background: rgba(255, 255, 255, .2); }

/* Footer */
.site-foot { border-top: 1px solid var(--border); background: var(--surface); padding: 48px 0 40px; font-size: .92rem; }
.foot-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 32px; margin-bottom: 30px; }
.foot-grid h4 { font-size: .78rem; letter-spacing: .1em; text-transform: uppercase; color: var(--faint); margin-bottom: 12px; }
.foot-grid a { color: var(--muted); text-decoration: none; display: block; padding: 4px 0; }
.foot-grid a:hover { color: var(--ink); }
.foot-brand { display: flex; align-items: center; gap: 10px; font-weight: 700; margin-bottom: 10px; }
.foot-brand img { width: 30px; height: 30px; border-radius: 8px; }
.disclaimer { color: var(--faint); font-size: .82rem; max-width: 62ch; }
.foot-bottom { border-top: 1px solid var(--border); padding-top: 20px; color: var(--faint); font-size: .84rem; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px; }
@media (max-width: 700px) { .foot-grid { grid-template-columns: 1fr; gap: 24px; } }

/* Guide article pages */
.article { padding: clamp(36px, 6vw, 60px) 0 20px; }
.crumb { font-size: .85rem; color: var(--faint); margin-bottom: 20px; }
.crumb a { color: var(--muted); text-decoration: none; }
.crumb a:hover { text-decoration: underline; }
.prose { max-width: 720px; }
.prose .meta { color: var(--faint); font-size: .88rem; margin-bottom: 26px; }
.prose h2 { margin-top: 2em; font-size: 1.5rem; }
.prose h3 { margin-top: 1.6em; }
.prose ul, .prose ol { padding-left: 1.3em; margin: 0 0 1.2em; }
.prose li { margin-bottom: .5em; }
.prose .callout { background: var(--surface-2); border: 1px solid var(--border); border-left: 3px solid var(--teal-deep); border-radius: 10px; padding: 18px 20px; margin: 1.6em 0; }
.prose .callout strong { color: var(--ink); }
.related { border-top: 1px solid var(--border); margin-top: 40px; padding-top: 28px; }
.related h2 { font-size: 1.2rem; }
.related-links { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.related-links a { display: block; padding: 14px 16px; border: 1px solid var(--border); border-radius: 12px; text-decoration: none; color: var(--ink); font-weight: 600; font-size: .92rem; background: var(--surface); }
.related-links a:hover { border-color: var(--teal-deep); }
@media (max-width: 700px) { .related-links { grid-template-columns: 1fr; } }