/* ==========================================================================
   NPSI Design System — npsinstitute.com
   Technical, authoritative, clinical. Engineering resource center.
   ========================================================================== */

:root {
  /* Deep industrial blues */
  --navy-950: #081420;
  --navy-900: #0B1D2E;
  --navy-800: #10283E;
  --navy-700: #16354F;
  --navy-600: #1E4466;

  /* Graphite / slate grays */
  --slate-700: #37444F;
  --slate-600: #4A5A68;
  --slate-500: #647482;
  --slate-400: #8B99A6;
  --slate-300: #B6C1CB;
  --slate-200: #D5DCE2;
  --slate-100: #E9EDF1;
  --paper:     #F6F8FA;
  --white:     #FFFFFF;

  /* Signal accent */
  --orange:      #F26A1B;
  --orange-deep: #D5560D;
  --orange-soft: #FDEBDD;

  /* Semantic */
  --certified:   #1D7A3E;
  --certified-bg:#E3F2E8;
  --caution:     #B25E00;
  --caution-bg:  #FBEFDC;
  --danger:      #B3261E;
  --danger-bg:   #F9E4E2;

  --ink:      var(--navy-900);
  --ink-soft: var(--slate-600);

  --font-sans: "Inter", "Public Sans", -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: "IBM Plex Mono", "JetBrains Mono", ui-monospace, "SFMono-Regular", Consolas, monospace;

  --maxw: 1200px;
  --radius: 6px;
  --shadow: 0 1px 2px rgba(8, 20, 32, .06), 0 4px 14px rgba(8, 20, 32, .07);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.6;
  font-size: 16px;
}

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

a { color: var(--navy-600); }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

.mono { font-family: var(--font-mono); }

/* --------------------------------------------------------------------------
   Utility bar + header
   -------------------------------------------------------------------------- */
.utility-bar {
  background: var(--navy-950);
  color: var(--slate-300);
  font-size: 12.5px;
  letter-spacing: .04em;
}
.utility-bar .wrap {
  display: flex; justify-content: space-between; align-items: center;
  min-height: 34px;
}
.utility-bar .tag { font-family: var(--font-mono); text-transform: uppercase; }
.utility-bar .tag strong { color: var(--orange); font-weight: 600; }

.site-header {
  background: var(--navy-900);
  color: var(--white);
  border-bottom: 3px solid var(--orange);
  position: sticky; top: 0; z-index: 50;
}
.site-header .wrap {
  display: flex; align-items: center; justify-content: space-between;
  min-height: 72px; gap: 24px;
}
.brand { display: flex; align-items: center; gap: 14px; text-decoration: none; color: var(--white); }
.brand-mark {
  width: 44px; height: 44px; flex: none;
  background: var(--orange);
  color: var(--navy-950);
  font-family: var(--font-mono); font-weight: 700; font-size: 13px;
  display: grid; place-items: center;
  clip-path: polygon(0 0, 100% 0, 100% 72%, 72% 100%, 0 100%);
}
.brand-name { line-height: 1.2; }
.brand-name .full { font-weight: 700; font-size: 15.5px; letter-spacing: .01em; display: block; }
.brand-name .sub  { font-size: 11.5px; color: var(--slate-300); letter-spacing: .12em; text-transform: uppercase; }

.site-nav { display: flex; gap: 4px; flex-wrap: wrap; }
.site-nav a {
  color: var(--slate-200); text-decoration: none;
  font-size: 14px; font-weight: 500;
  padding: 9px 13px; border-radius: 4px;
}
.site-nav a:hover { background: var(--navy-700); color: var(--white); }
.site-nav a.active { background: var(--navy-800); color: var(--white); box-shadow: inset 0 -2px 0 var(--orange); }

/* --------------------------------------------------------------------------
   Hero
   -------------------------------------------------------------------------- */
.hero {
  background:
    linear-gradient(115deg, rgba(8,20,32,.96) 35%, rgba(16,40,62,.88) 70%, rgba(22,53,79,.82)),
    repeating-linear-gradient(45deg, #0E2438 0 2px, #0B1D2E 2px 26px);
  color: var(--white);
  padding: 72px 0 64px;
  border-bottom: 1px solid var(--navy-700);
}
.hero .kicker {
  font-family: var(--font-mono); font-size: 13px; letter-spacing: .18em;
  text-transform: uppercase; color: var(--orange); margin-bottom: 18px;
}
.hero h1 {
  font-size: clamp(30px, 4.4vw, 48px);
  line-height: 1.12; font-weight: 800; letter-spacing: -.015em;
  max-width: 820px;
}
.hero p.lede {
  margin-top: 20px; max-width: 720px;
  font-size: 18px; color: var(--slate-200);
}
.hero .cta-row { margin-top: 34px; display: flex; gap: 14px; flex-wrap: wrap; }

.btn {
  display: inline-flex; align-items: center; gap: 8px;
  font-weight: 600; font-size: 15px; text-decoration: none;
  padding: 12px 22px; border-radius: var(--radius);
  border: 1px solid transparent; cursor: pointer;
}
.btn-primary { background: var(--orange); color: var(--navy-950); }
.btn-primary:hover { background: var(--orange-deep); color: var(--white); }
.btn-ghost { border-color: var(--slate-500); color: var(--white); background: transparent; }
.btn-ghost:hover { border-color: var(--white); }

/* --------------------------------------------------------------------------
   Sections
   -------------------------------------------------------------------------- */
.section { padding: 64px 0; }
.section.alt { background: var(--white); border-top: 1px solid var(--slate-100); border-bottom: 1px solid var(--slate-100); }

.section-head { max-width: 780px; margin-bottom: 36px; }
.section-head .kicker {
  font-family: var(--font-mono); font-size: 12.5px; letter-spacing: .16em;
  text-transform: uppercase; color: var(--orange-deep); margin-bottom: 10px;
}
.section-head h2 { font-size: clamp(24px, 3vw, 32px); font-weight: 750; letter-spacing: -.01em; }
.section-head p { margin-top: 12px; color: var(--ink-soft); font-size: 16.5px; }

/* Cards */
.card-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 20px; }
.card {
  background: var(--white); border: 1px solid var(--slate-200);
  border-radius: var(--radius); padding: 26px; box-shadow: var(--shadow);
  display: flex; flex-direction: column; gap: 12px;
}
.card .card-code {
  font-family: var(--font-mono); font-size: 12px; color: var(--slate-500);
  letter-spacing: .08em;
}
.card h3 { font-size: 18.5px; font-weight: 700; }
.card p { color: var(--ink-soft); font-size: 15px; flex: 1; }
.card .card-link {
  font-weight: 600; font-size: 14.5px; text-decoration: none; color: var(--orange-deep);
}
.card .card-link:hover { text-decoration: underline; }

/* Stat band */
.stat-band { background: var(--navy-900); color: var(--white); padding: 44px 0; }
.stat-band .wrap { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 28px; }
.stat .num { font-family: var(--font-mono); font-size: 34px; font-weight: 700; color: var(--orange); }
.stat .label { font-size: 13.5px; color: var(--slate-300); letter-spacing: .05em; text-transform: uppercase; margin-top: 4px; }

/* --------------------------------------------------------------------------
   Data tables
   -------------------------------------------------------------------------- */
.table-scroll { overflow-x: auto; border: 1px solid var(--slate-200); border-radius: var(--radius); background: var(--white); box-shadow: var(--shadow); }
table.data {
  width: 100%; border-collapse: collapse; font-size: 14.5px; min-width: 640px;
}
table.data caption {
  text-align: left; padding: 14px 16px 10px;
  font-weight: 700; font-size: 15px;
}
table.data th {
  background: var(--navy-800); color: var(--white);
  font-size: 12.5px; letter-spacing: .07em; text-transform: uppercase;
  text-align: left; padding: 11px 16px; white-space: nowrap;
}
table.data td { padding: 11px 16px; border-top: 1px solid var(--slate-100); vertical-align: top; }
table.data tbody tr:nth-child(even) { background: var(--paper); }
table.data td.code, table.data th.code { font-family: var(--font-mono); }
table.data td .sub { display: block; font-size: 12.5px; color: var(--slate-500); }

/* Badges */
.badge {
  display: inline-block; font-family: var(--font-mono); font-size: 11.5px;
  font-weight: 600; letter-spacing: .05em; text-transform: uppercase;
  padding: 3px 9px; border-radius: 3px; white-space: nowrap;
}
.badge.certified { background: var(--certified-bg); color: var(--certified); }
.badge.pending   { background: var(--caution-bg);   color: var(--caution); }
.badge.uncert    { background: var(--danger-bg);    color: var(--danger); }
.badge.neutral   { background: var(--slate-100);    color: var(--slate-600); }
.badge.orange    { background: var(--orange-soft);  color: var(--orange-deep); }

/* --------------------------------------------------------------------------
   Decoder tool
   -------------------------------------------------------------------------- */
.tool-panel {
  background: var(--white); border: 1px solid var(--slate-200);
  border-left: 4px solid var(--orange);
  border-radius: var(--radius); box-shadow: var(--shadow);
  padding: 28px;
}
.tool-panel h3 { font-size: 18px; margin-bottom: 6px; }
.tool-panel .hint { color: var(--ink-soft); font-size: 14px; margin-bottom: 18px; }

.tool-controls { display: flex; gap: 14px; flex-wrap: wrap; align-items: end; }
.field { display: flex; flex-direction: column; gap: 6px; }
.field label {
  font-size: 12px; font-weight: 600; letter-spacing: .08em;
  text-transform: uppercase; color: var(--slate-600);
}
.field select, .field input[type="search"] {
  font-family: var(--font-sans); font-size: 15px;
  padding: 10px 12px; min-width: 210px;
  border: 1px solid var(--slate-300); border-radius: 4px; background: var(--white);
}
.field select:focus, .field input:focus { outline: 2px solid var(--orange); outline-offset: 1px; border-color: var(--orange); }

.decoder-result {
  margin-top: 22px; padding: 20px 22px;
  background: var(--navy-900); color: var(--white); border-radius: var(--radius);
  display: none;
}
.decoder-result.show { display: block; }
.decoder-result .headline { font-family: var(--font-mono); font-size: 20px; font-weight: 700; color: var(--orange); }
.decoder-result .detail { margin-top: 8px; font-size: 14.5px; color: var(--slate-200); }
.decoder-result .warn { margin-top: 12px; font-size: 13.5px; color: #FFC9A3; }

/* Tabs */
.tabs { display: flex; gap: 2px; border-bottom: 2px solid var(--slate-200); margin-bottom: 24px; flex-wrap: wrap; }
.tab-btn {
  font-family: var(--font-sans); font-size: 14.5px; font-weight: 600;
  background: none; border: none; cursor: pointer;
  color: var(--slate-500); padding: 11px 18px;
  border-bottom: 3px solid transparent; margin-bottom: -2px;
}
.tab-btn:hover { color: var(--ink); }
.tab-btn.active { color: var(--ink); border-bottom-color: var(--orange); }
.tab-pane { display: none; }
.tab-pane.active { display: block; }

/* Filter row */
.filter-row {
  display: flex; gap: 14px; flex-wrap: wrap; align-items: end;
  padding: 18px; background: var(--white);
  border: 1px solid var(--slate-200); border-bottom: none;
  border-radius: var(--radius) var(--radius) 0 0;
}
.filter-row + .table-scroll { border-radius: 0 0 var(--radius) var(--radius); }
.result-count { font-family: var(--font-mono); font-size: 13px; color: var(--slate-500); margin-left: auto; align-self: center; }

/* --------------------------------------------------------------------------
   Resource / download cards
   -------------------------------------------------------------------------- */
.dl-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 16px; }
.dl-card {
  display: flex; gap: 16px; align-items: flex-start;
  background: var(--white); border: 1px solid var(--slate-200);
  border-radius: var(--radius); padding: 18px; box-shadow: var(--shadow);
}
.dl-icon {
  flex: none; width: 46px; height: 54px; border-radius: 4px;
  display: grid; place-items: center;
  font-family: var(--font-mono); font-size: 11px; font-weight: 700; color: var(--white);
  position: relative;
}
.dl-icon.pdf { background: var(--danger); }
.dl-icon.cad { background: var(--navy-600); }
.dl-icon.bim { background: var(--certified); }
.dl-icon.doc { background: var(--slate-600); }
.dl-meta h4 { font-size: 15px; font-weight: 700; line-height: 1.35; }
.dl-meta .spec-code { font-family: var(--font-mono); font-size: 12px; color: var(--slate-500); }
.dl-meta .filesize { font-size: 12.5px; color: var(--slate-400); }
.dl-meta a { font-size: 13.5px; font-weight: 600; color: var(--orange-deep); text-decoration: none; }
.dl-meta a:hover { text-decoration: underline; }

/* Myth vs reality */
.mvr-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0; border: 1px solid var(--slate-200); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); }
.mvr-grid > div { padding: 22px 24px; background: var(--white); }
.mvr-grid .myth { border-right: 1px solid var(--slate-200); }
.mvr-grid .label {
  font-family: var(--font-mono); font-size: 11.5px; font-weight: 700;
  letter-spacing: .1em; text-transform: uppercase; margin-bottom: 8px; display: inline-block;
  padding: 2px 8px; border-radius: 3px;
}
.mvr-grid .myth .label { background: var(--danger-bg); color: var(--danger); }
.mvr-grid .reality .label { background: var(--certified-bg); color: var(--certified); }
.mvr-grid h4 { font-size: 15.5px; margin-bottom: 6px; }
.mvr-grid p { font-size: 14.5px; color: var(--ink-soft); }
.mvr-stack { display: grid; gap: 18px; }

/* Callout */
.callout {
  border: 1px solid var(--slate-200); border-left: 4px solid var(--orange);
  background: var(--white); border-radius: var(--radius);
  padding: 18px 22px; font-size: 15px; color: var(--ink-soft);
}
.callout strong { color: var(--ink); }

/* Page title band */
.page-title {
  background: var(--navy-900); color: var(--white); padding: 46px 0 40px;
  border-bottom: 3px solid var(--orange);
}
.page-title .kicker { font-family: var(--font-mono); font-size: 12.5px; letter-spacing: .16em; text-transform: uppercase; color: var(--orange); margin-bottom: 10px; }
.page-title h1 { font-size: clamp(26px, 3.6vw, 40px); font-weight: 800; letter-spacing: -.012em; }
.page-title p { margin-top: 12px; max-width: 760px; color: var(--slate-200); font-size: 16.5px; }

/* Prose */
.prose { max-width: 820px; }
.prose h3 { font-size: 20px; margin: 30px 0 10px; }
.prose p { margin-bottom: 14px; color: var(--ink-soft); }
.prose ul { margin: 0 0 14px 22px; color: var(--ink-soft); }
.prose li { margin-bottom: 6px; }

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */
.site-footer { background: var(--navy-950); color: var(--slate-300); padding: 52px 0 34px; margin-top: 72px; }
.site-footer .cols { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 36px; }
.site-footer h5 { color: var(--white); font-size: 13px; letter-spacing: .1em; text-transform: uppercase; margin-bottom: 14px; }
.site-footer a { color: var(--slate-300); text-decoration: none; font-size: 14px; display: block; margin-bottom: 8px; }
.site-footer a:hover { color: var(--white); }
.site-footer .mission { font-size: 14px; max-width: 340px; }
.site-footer .legal {
  margin-top: 40px; padding-top: 20px; border-top: 1px solid var(--navy-700);
  font-size: 12.5px; color: var(--slate-500);
  display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap;
}

/* --------------------------------------------------------------------------
   Responsive
   -------------------------------------------------------------------------- */
@media (max-width: 900px) {
  .site-header .wrap { flex-direction: column; align-items: flex-start; padding-top: 12px; padding-bottom: 12px; }
  .site-footer .cols { grid-template-columns: 1fr 1fr; }
  .mvr-grid { grid-template-columns: 1fr; }
  .mvr-grid .myth { border-right: none; border-bottom: 1px solid var(--slate-200); }
}
@media (max-width: 560px) {
  .site-footer .cols { grid-template-columns: 1fr; }
  .field select, .field input[type="search"] { min-width: 100%; }
}

/* --------------------------------------------------------------------------
   Guide articles
   -------------------------------------------------------------------------- */
.article { max-width: 860px; }
.article-meta {
  font-family: var(--font-mono); font-size: 12.5px; color: var(--slate-500);
  letter-spacing: .06em; text-transform: uppercase;
  display: flex; gap: 18px; flex-wrap: wrap; margin-bottom: 26px;
}
.at-a-glance {
  background: var(--white); border: 1px solid var(--slate-200);
  border-left: 4px solid var(--orange); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 22px 26px; margin: 0 0 34px;
}
.at-a-glance h4 {
  font-family: var(--font-mono); font-size: 12px; letter-spacing: .12em;
  text-transform: uppercase; color: var(--orange-deep); margin-bottom: 12px;
}
.at-a-glance ul { margin: 0 0 0 20px; }
.at-a-glance li { font-size: 15px; color: var(--ink-soft); margin-bottom: 7px; }
.at-a-glance li strong { color: var(--ink); }

.article .prose h3 {
  font-size: 21px; margin: 34px 0 12px; padding-top: 10px;
}
.article .table-scroll { margin: 20px 0 26px; }

.refs { margin-top: 44px; padding-top: 22px; border-top: 2px solid var(--slate-200); }
.refs h4 {
  font-family: var(--font-mono); font-size: 12px; letter-spacing: .12em;
  text-transform: uppercase; color: var(--slate-600); margin-bottom: 12px;
}
.refs ol { margin-left: 20px; }
.refs li { font-size: 13.5px; color: var(--slate-500); margin-bottom: 6px; }

.guide-nav {
  margin-top: 40px; display: flex; justify-content: space-between; gap: 14px; flex-wrap: wrap;
}
.guide-nav a {
  font-size: 14.5px; font-weight: 600; color: var(--orange-deep); text-decoration: none;
}
.guide-nav a:hover { text-decoration: underline; }

.verify-flag {
  background: var(--caution-bg); border: 1px solid #E8CFA6; border-radius: var(--radius);
  padding: 14px 18px; font-size: 14px; color: var(--caution); margin: 22px 0;
}