/* ============================================================
   Measurement Viewer — Academy page (standalone)
   Same Blueprint Steel palette as landing.css. Shared blocks
   (nav, footer, buttons) intentionally duplicated for now so
   each page stays a self-contained file; extract a shared
   site.css once the marketing repo settles.
   ============================================================ */

:root {
  --steel:       #284561;
  --steel-grid:  #33547a;
  --steel-text:  #ffffff;
  --steel-mut:   #c4d2e4;
  --steel-dim:   #7e93ad;

  --bg:          #f6f8fb;
  --bg-grid:     #e7ecf3;
  --panel:       #ffffff;
  --border:      #d5dce6;
  --border-dash: #bcc5d3;

  --text:        #16191d;
  --text-2:      #5e6878;
  --text-3:      #8a96a8;

  --accent:      #2f86d4;
  --accent-soft: rgba(47, 134, 212, 0.12);
  --link:        #2563b0;

  --radius: 10px;
  --max: 900px;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.55;
}

h1, h2, h3 { line-height: 1.2; margin: 0; letter-spacing: -0.015em; }
p { margin: 0; }

a { color: var(--link); text-decoration: none; }
a:focus-visible,
.btn:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 4px;
}

/* ---------- buttons (shared) ---------- */
.btn {
  display: inline-block;
  padding: 9px 18px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  transition: filter .12s;
}
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { filter: brightness(1.08); }
.btn-lg { padding: 12px 26px; font-size: 15px; }

/* ---------- nav (shared) ---------- */
.nav {
  background: var(--steel);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px 18px;
  padding: 14px clamp(16px, 4vw, 40px);
}
.nav-brand { display: flex; align-items: center; gap: 10px; color: var(--steel-text); }
.nav-logo {
  width: 26px; height: 26px;
  border-radius: 7px;
  background: var(--accent);
  flex: 0 0 auto;
}
.nav-name { font-size: 15px; font-weight: 600; }
.nav-links { display: flex; align-items: center; flex-wrap: wrap; gap: 8px 20px; }
.nav-links > a:not(.btn) { color: var(--steel-mut); font-size: 14px; }
.nav-links > a:not(.btn):hover,
.nav-links > a[aria-current="page"] { color: var(--steel-text); }

/* ---------- academy hero (steel) ---------- */
.academy-hero {
  background-color: var(--steel);
  background-image:
    linear-gradient(var(--steel-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--steel-grid) 1px, transparent 1px);
  background-size: 32px 32px;
  text-align: center;
  padding: clamp(40px, 6vw, 64px) 20px 52px;
}
.academy-hero h1 {
  color: var(--steel-text);
  font-size: clamp(28px, 4.4vw, 40px);
  font-weight: 750;
}
.academy-hero > p {
  color: var(--steel-mut);
  font-size: 15px;
  margin: 10px auto 26px;
  max-width: 520px;
}

.search-box {
  display: flex;
  align-items: center;
  gap: 10px;
  max-width: 520px;
  margin: 0 auto;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 4px 8px 4px 16px;
}
.search-box svg {
  width: 18px; height: 18px;
  stroke: var(--text-3);
  stroke-width: 1.8;
  fill: none;
  stroke-linecap: round;
  flex: 0 0 auto;
}
.search-box input {
  flex: 1;
  border: none;
  outline: none;
  background: transparent;
  font-size: 14px;
  color: var(--text);
  padding: 9px 0;
}
.search-box input::placeholder { color: var(--text-3); }
.search-box input:disabled { cursor: not-allowed; }

/* ---------- category cards ---------- */
.categories {
  max-width: var(--max);
  margin: -30px auto 0;   /* overlaps the hero edge — cards bridge steel → light */
  padding: 0 clamp(16px, 4vw, 40px);
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
}
.cat-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 16px;
  text-align: center;
  color: var(--text);
  transition: border-color .12s, box-shadow .12s;
}
.cat-card:hover {
  border-color: var(--accent);
  box-shadow: 0 3px 12px rgba(22, 25, 29, 0.07);
}
.cat-card svg {
  width: 26px; height: 26px;
  stroke: var(--accent);
  stroke-width: 1.7;
  fill: none;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.cat-card h2 { font-size: 14.5px; font-weight: 650; margin: 8px 0 3px; }
.cat-card p { color: var(--text-3); font-size: 12px; }

/* ---------- section titles ---------- */
.section-title {
  font-size: 19px;
  font-weight: 700;
  margin-bottom: 16px;
}

/* ---------- featured tutorials ---------- */
.featured {
  max-width: var(--max);
  margin: 0 auto;
  padding: 44px clamp(16px, 4vw, 40px) 8px;
}
.video-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}
.video-card { color: var(--text); }
.video-thumb {
  position: relative;
  margin: 0 0 9px;
  aspect-ratio: 16 / 9;
  border: 2px dashed var(--border-dash);
  border-radius: var(--radius);
  background:
    linear-gradient(var(--bg-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--bg-grid) 1px, transparent 1px),
    var(--panel);
  background-size: 18px 18px, 18px 18px, auto;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: border-color .12s;
}
.video-card:hover .video-thumb { border-color: var(--accent); }
.play {
  width: 0; height: 0;
  border-left: 16px solid var(--accent);
  border-top: 10px solid transparent;
  border-bottom: 10px solid transparent;
  margin-left: 3px;
}
.duration {
  position: absolute;
  right: 7px; bottom: 7px;
  background: var(--steel);
  color: var(--steel-text);
  font-size: 11px;
  border-radius: 5px;
  padding: 1px 6px;
}
.video-card h3 { font-size: 14px; font-weight: 650; }
.video-card p { color: var(--text-2); font-size: 12.5px; margin-top: 3px; }

/* ---------- category entry lists ---------- */
.entries {
  max-width: var(--max);
  margin: 0 auto;
  padding: 34px clamp(16px, 4vw, 40px) 0;
  scroll-margin-top: 20px;
}
.entry {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 9px;
  padding: 12px 14px;
  margin-bottom: 8px;
  color: var(--text);
  transition: border-color .12s;
}
.entry:hover { border-color: var(--accent); }
.entry-title { font-size: 14px; font-weight: 550; flex: 1; }
.entry-time { color: var(--text-3); font-size: 12px; }

.badge {
  font-size: 10.5px;
  font-weight: 650;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  border-radius: 5px;
  padding: 2px 7px;
  flex: 0 0 auto;
}
.badge-video   { background: var(--accent-soft); color: var(--link); }
.badge-article { background: var(--bg); color: var(--text-2); border: 1px solid var(--border); }

/* ---------- FAQ ---------- */
.faq {
  max-width: var(--max);
  margin: 0 auto;
  padding: 44px clamp(16px, 4vw, 40px) 10px;
  scroll-margin-top: 20px;
}
.faq details {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 9px;
  margin-bottom: 8px;
}
.faq summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 13px 16px;
  font-size: 14px;
  font-weight: 550;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "";
  width: 8px; height: 8px;
  border-right: 2px solid var(--text-3);
  border-bottom: 2px solid var(--text-3);
  transform: rotate(45deg);
  transition: transform .15s;
  flex: 0 0 auto;
}
.faq details[open] summary::after { transform: rotate(225deg); }
.faq details[open] summary { color: var(--link); }
.faq details > p {
  color: var(--text-2);
  font-size: 13.5px;
  padding: 0 16px 14px;
}

/* ---------- contact band ---------- */
.contact-band {
  text-align: center;
  padding: 52px 20px 64px;
}
.contact-band h2 { font-size: clamp(20px, 3vw, 26px); margin-bottom: 18px; }

/* ---------- footer (shared) ---------- */
.footer {
  background: var(--panel);
  border-top: 1px solid var(--border);
  padding: 30px clamp(16px, 4vw, 40px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 14px 26px;
}
.footer-brand { display: flex; align-items: center; gap: 10px; font-size: 14px; font-weight: 600; }
.footer-links { display: flex; flex-wrap: wrap; gap: 8px 20px; }
.footer-links a { color: var(--text-2); font-size: 13px; }
.footer-links a:hover { color: var(--text); }
.footer-legal { color: var(--text-3); font-size: 12px; width: 100%; }

/* ---------- responsive ---------- */
@media (max-width: 860px) {
  .categories { grid-template-columns: repeat(2, 1fr); }
  .video-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 480px) {
  .video-grid { grid-template-columns: 1fr; }
}