/* CDL Prep Hub — Industrial highway-sign design system
   Palette: deep navy + safety orange + concrete white
   Type: Oswald (display, condensed industrial) + Inter (body) */

:root {
  --navy-900: #0a1628;
  --navy-800: #102338;
  --navy-700: #1a3050;
  --navy-600: #25426b;
  --navy-100: #e7ecf3;
  --navy-50:  #f3f5f9;
  --orange:   #ff6a00;       /* safety orange — DOT/highway */
  --orange-deep: #d95400;
  --orange-50: #fff3e8;
  --amber:    #ffb000;       /* construction-zone yellow */
  --ink:      #0a1628;
  --ink-soft: #4a5b73;
  --ink-mute: #7c8a9e;
  --rule:     #d8dee8;
  --rule-soft:#e9edf3;
  --paper:    #ffffff;
  --bg:       #f6f8fb;
  --green:    #1f7a3a;
  --green-50: #e6f4ec;
  --red:      #b32b1f;
  --max:      1180px;
  --radius:   6px;
  --radius-lg: 10px;
  --shadow-sm: 0 1px 2px rgba(10,22,40,.06), 0 1px 0 rgba(10,22,40,.04);
  --shadow:    0 6px 22px rgba(10,22,40,.08);
  --shadow-lg: 0 18px 50px rgba(10,22,40,.16);
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
html, body { margin: 0; padding: 0; }
body {
  font-family: "Inter", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--navy-700); text-decoration: none; }
a:hover { color: var(--orange-deep); text-decoration: underline; }

h1, h2, h3, h4, h5, .display {
  font-family: "Oswald", "Arial Narrow", "Helvetica Neue", Arial, sans-serif;
  font-weight: 600;
  letter-spacing: 0.005em;
  line-height: 1.15;
  color: var(--navy-900);
  text-wrap: balance;
}
h1 { font-size: clamp(34px, 4.5vw, 56px); margin: 0 0 16px; }
h2 { font-size: clamp(24px, 2.4vw, 32px); margin: 36px 0 14px; }
h3 { font-size: 20px; margin: 22px 0 8px; }
h4 { font-size: 14px; text-transform: uppercase; letter-spacing: .12em; color: var(--ink-soft); margin: 0 0 10px; }
p  { margin: 0 0 14px; max-width: 70ch; }
strong { font-weight: 700; color: var(--navy-900); }
small { color: var(--ink-soft); }

.container { max-width: var(--max); margin: 0 auto; padding: 0 24px; }
.container-narrow { max-width: 880px; margin: 0 auto; padding: 0 24px; }

/* Top utility bar — looks like a highway sign band */
.utility-bar {
  background: var(--orange);
  color: var(--navy-900);
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .08em;
  padding: 7px 0;
}
.utility-bar .container { display: flex; justify-content: space-between; align-items: center; gap: 14px; flex-wrap: wrap; }
.utility-bar a { color: var(--navy-900); text-decoration: underline; }

/* Header */
.site-header {
  background: var(--navy-900);
  color: #fff;
  border-bottom: 4px solid var(--orange);
  position: sticky; top: 0; z-index: 30;
  box-shadow: 0 2px 0 rgba(0,0,0,.2);
}
.nav { display: flex; align-items: center; justify-content: space-between; padding: 16px 24px; gap: 18px; }
.brand { display: inline-flex; align-items: center; gap: 12px; color: #fff; font-weight: 700; }
.brand:hover { color: #fff; text-decoration: none; }
.brand-mark {
  background: var(--orange); color: var(--navy-900);
  font-family: "Oswald", sans-serif;
  font-weight: 700; padding: 6px 10px 4px;
  border-radius: 3px; font-size: 18px; letter-spacing: .04em;
  box-shadow: inset 0 -2px 0 rgba(0,0,0,.18);
}
.brand-name {
  font-family: "Oswald", sans-serif;
  font-size: 22px; letter-spacing: .04em; text-transform: uppercase;
}
.brand-accent { color: var(--orange); }
.nav-links { display: flex; align-items: center; gap: 6px; flex-wrap: wrap; }
.nav-links a {
  color: #d6dde9; padding: 10px 14px;
  font-weight: 600; font-size: 14px; letter-spacing: .03em;
  text-transform: uppercase; border-radius: 4px;
}
.nav-links a:hover { color: #fff; background: rgba(255,255,255,.08); text-decoration: none; }
.nav-cta {
  background: var(--orange); color: var(--navy-900) !important;
  padding: 10px 16px !important; border-radius: 4px;
}
.nav-cta:hover { background: #ff8126 !important; color: var(--navy-900) !important; }

/* Mobile nav */
@media (max-width: 760px) {
  .nav { flex-wrap: wrap; }
  .nav-links { width: 100%; justify-content: flex-start; gap: 0; padding-top: 6px; border-top: 1px solid rgba(255,255,255,.08); }
  .nav-links a { padding: 8px 10px; font-size: 13px; }
}

.site-main { padding: 0 0 64px; }

/* Hero */
.hero {
  position: relative;
  background:
    linear-gradient(180deg, rgba(10,22,40,.86), rgba(10,22,40,.82)),
    radial-gradient(900px 400px at 80% 0%, rgba(255,106,0,.25), transparent 60%),
    linear-gradient(135deg, #0a1628 0%, #1a3050 100%);
  color: #fff;
  padding: 64px 0 80px;
  overflow: hidden;
}
.hero::before {
  content: ""; position: absolute; inset: 0 0 0 0;
  background-image:
    repeating-linear-gradient(90deg, transparent 0 60px, rgba(255,176,0,.06) 60px 64px);
  pointer-events: none;
}
.hero-grid { position: relative; display: grid; grid-template-columns: 1.15fr .85fr; gap: 48px; align-items: center; }
@media (max-width: 880px) { .hero-grid { grid-template-columns: 1fr; gap: 32px; } }
.hero h1 {
  color: #fff;
  font-size: clamp(42px, 6vw, 76px);
  letter-spacing: -.005em;
  text-transform: uppercase;
  margin: 18px 0 18px;
}
.hero h1 .accent { color: var(--orange); }
.hero p.lead {
  font-size: 19px; color: #c9d3e2;
  max-width: 56ch;
}
.hero-cta { margin-top: 32px; display: flex; flex-wrap: wrap; gap: 14px; }
.hero-meta {
  margin-top: 36px; display: flex; gap: 32px; flex-wrap: wrap;
  padding-top: 26px; border-top: 1px solid rgba(255,255,255,.12);
}
.hero-meta div { color: #d6dde9; }
.hero-meta strong {
  display: block; color: var(--orange); font-family: "Oswald", sans-serif;
  font-size: 32px; line-height: 1; margin-bottom: 4px;
}
.hero-image {
  width: 100%; border-radius: var(--radius-lg);
  box-shadow: 0 24px 60px rgba(0,0,0,.45), 0 0 0 1px rgba(255,255,255,.06);
  aspect-ratio: 4/3; object-fit: cover;
}
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(255,106,0,.18);
  color: #ffd6b3; border: 1px solid rgba(255,106,0,.4);
  font-size: 12px; font-weight: 700; letter-spacing: .12em;
  text-transform: uppercase; padding: 7px 12px; border-radius: 4px;
}
.hero-badge::before {
  content: ""; width: 8px; height: 8px; border-radius: 50%;
  background: var(--orange); box-shadow: 0 0 0 4px rgba(255,106,0,.25);
}

/* Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  gap: 8px; padding: 14px 22px; border-radius: 4px;
  font-family: "Oswald", sans-serif;
  font-weight: 600; font-size: 16px; letter-spacing: .06em;
  text-transform: uppercase;
  border: 2px solid transparent;
  transition: transform .12s ease, background .15s ease, box-shadow .15s ease;
  cursor: pointer;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn-primary {
  background: var(--orange); color: var(--navy-900);
  box-shadow: 0 6px 0 var(--orange-deep), 0 10px 24px rgba(255,106,0,.3);
}
.btn-primary:hover { background: #ff8126; color: var(--navy-900); }
.btn-primary:active { transform: translateY(2px); box-shadow: 0 3px 0 var(--orange-deep); }
.btn-ghost { background: transparent; color: #fff; border-color: rgba(255,255,255,.35); }
.btn-ghost:hover { background: rgba(255,255,255,.06); color: #fff; border-color: #fff; }
.btn-secondary { background: var(--navy-900); color: #fff; }
.btn-secondary:hover { background: var(--navy-700); color: #fff; }
.btn-lg { padding: 18px 28px; font-size: 17px; }
.btn-block { display: flex; width: 100%; }

/* Section */
.section { padding: 56px 0; }
.section-tight { padding: 36px 0; }
.section-bg {
  background: var(--paper);
  border-top: 1px solid var(--rule-soft);
  border-bottom: 1px solid var(--rule-soft);
}
.section h2 { margin-top: 0; }
.section .lead { color: var(--ink-soft); margin: 0 0 32px; max-width: 64ch; font-size: 17px; }
.eyebrow {
  display: inline-block; font-family: "Oswald", sans-serif;
  font-size: 13px; font-weight: 600; letter-spacing: .18em;
  text-transform: uppercase; color: var(--orange-deep);
  padding: 4px 0 10px;
}
.section-head { margin-bottom: 28px; }

/* Grid */
.grid { display: grid; gap: 16px; }
.grid-2 { grid-template-columns: repeat(2, minmax(0,1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0,1fr)); }
.grid-4 { grid-template-columns: repeat(4, minmax(0,1fr)); }
.grid-5 { grid-template-columns: repeat(5, minmax(0,1fr)); }
@media (max-width: 980px) { .grid-4, .grid-5 { grid-template-columns: repeat(3, 1fr); } }
@media (max-width: 720px) { .grid-3, .grid-4, .grid-5, .grid-2 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 480px) { .grid-3, .grid-4, .grid-5 { grid-template-columns: 1fr; } }

/* Cards */
.card {
  background: var(--paper); border-radius: var(--radius);
  padding: 18px 18px; border: 1px solid var(--rule);
  display: block; color: var(--ink);
  box-shadow: var(--shadow-sm);
  transition: transform .15s ease, box-shadow .15s ease, border-color .15s ease;
}
.card:hover {
  transform: translateY(-2px); border-color: var(--orange);
  box-shadow: 0 14px 30px rgba(10,22,40,.10);
  text-decoration: none; color: var(--ink);
}
.card h3 {
  margin: 0 0 6px; font-size: 18px;
  font-family: "Oswald", sans-serif; letter-spacing: .02em;
}
.card p { color: var(--ink-soft); margin: 0; font-size: 14px; }
.card-icon {
  width: 40px; height: 40px; border-radius: 4px;
  background: var(--orange-50); color: var(--orange-deep);
  display: inline-flex; align-items: center; justify-content: center;
  font-family: "Oswald", sans-serif; font-weight: 700; font-size: 18px;
  margin-bottom: 12px;
}

.state-grid .card { padding: 14px 16px; text-align: left; }
.state-grid .card h3 { font-size: 16px; display: flex; align-items: center; justify-content: space-between; gap: 8px; }
.state-grid .card .abbr {
  font-family: "Oswald", sans-serif; color: var(--orange-deep);
  font-size: 13px; letter-spacing: .08em;
}

/* Endorsement card */
.endorsement-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
@media (max-width: 720px) { .endorsement-list { grid-template-columns: 1fr; } }
.endorsement-list .card h3 { display: flex; align-items: center; gap: 12px; }

/* Pill */
.pill {
  display: inline-block; background: var(--navy-100); color: var(--navy-700);
  font-family: "Oswald", sans-serif; font-size: 12px; font-weight: 600;
  padding: 4px 10px; border-radius: 3px; letter-spacing: .08em;
  text-transform: uppercase;
}
.pill-orange { background: var(--orange-50); color: var(--orange-deep); }
.pill-green { background: var(--green-50); color: var(--green); }

/* Layout: article + sidebar */
.layout-two { display: grid; grid-template-columns: 1fr 300px; gap: 36px; align-items: start; }
@media (max-width: 980px) { .layout-two { grid-template-columns: 1fr; } }
.layout-two > .prose { min-width: 0; }

/* Prose */
.prose {
  background: var(--paper); padding: 32px 36px; border-radius: var(--radius-lg);
  border: 1px solid var(--rule); box-shadow: var(--shadow-sm);
}
@media (max-width: 600px) { .prose { padding: 22px 20px; } }
.prose > *:first-child { margin-top: 0; }
.prose h2 { padding-top: 8px; border-top: 3px solid var(--orange); display: inline-block; padding-right: 14px; margin-top: 32px; }
.prose h3 { color: var(--navy-800); }
.prose ul, .prose ol { padding-left: 22px; }
.prose li { margin: 6px 0; }
.prose blockquote {
  margin: 18px 0; padding: 14px 20px;
  border-left: 4px solid var(--orange);
  background: var(--orange-50); color: var(--ink);
  font-style: italic;
}
.prose .ad-slot {
  margin: 24px 0; text-align: center;
}

/* Breadcrumbs */
.breadcrumbs {
  color: var(--ink-soft); font-size: 13px; margin: 18px 0;
  font-family: "Oswald", sans-serif; letter-spacing: .04em; text-transform: uppercase;
}
.breadcrumbs a { color: var(--ink-soft); }
.breadcrumbs a:hover { color: var(--orange-deep); }
.breadcrumbs span { color: var(--ink-mute); margin: 0 8px; }

/* Sidebar */
.sidebar { display: flex; flex-direction: column; gap: 16px; position: sticky; top: 96px; }
.sidebar-card {
  background: var(--paper); padding: 18px 20px; border-radius: var(--radius-lg);
  border: 1px solid var(--rule); box-shadow: var(--shadow-sm);
}
.sidebar-card h4 {
  font-family: "Oswald", sans-serif; font-size: 14px;
  text-transform: uppercase; letter-spacing: .12em;
  color: var(--navy-900); margin: 0 0 12px;
  padding-bottom: 8px; border-bottom: 2px solid var(--orange);
}
.sidebar-card ul { list-style: none; padding: 0; margin: 0; }
.sidebar-card li { padding: 7px 0; border-bottom: 1px solid var(--rule-soft); font-size: 14px; }
.sidebar-card li:last-child { border-bottom: 0; }
.sidebar-card .ad-slot { margin: 0; }

/* Editorial recommendation block (PBN slots) */
.recs-block {
  background: var(--paper); padding: 18px 20px; border-radius: var(--radius-lg);
  border: 1px solid var(--rule); box-shadow: var(--shadow-sm);
}
.recs-block h4 {
  font-family: "Oswald", sans-serif; font-size: 14px;
  text-transform: uppercase; letter-spacing: .12em;
  color: var(--navy-900); margin: 0 0 4px;
  padding-bottom: 8px; border-bottom: 2px solid var(--orange);
}
.recs-block .recs-sub { color: var(--ink-soft); font-size: 12px; margin: -2px 0 12px; font-style: italic; }
.recs-list { list-style: none; padding: 0; margin: 0; }
.recs-list li {
  padding: 10px 0; border-bottom: 1px solid var(--rule-soft);
}
.recs-list li:last-child { border-bottom: 0; }
.recs-list a, .recs-list span {
  display: block; color: var(--navy-700);
  font-weight: 600; font-size: 14px; line-height: 1.35;
}
.recs-list a:hover { color: var(--orange-deep); }
.recs-list .recs-meta { color: var(--ink-mute); font-size: 12px; margin-top: 2px; font-weight: 400; }

/* Practice test question */
.q {
  background: var(--paper); padding: 20px 24px;
  border: 1px solid var(--rule); border-radius: var(--radius-lg);
  margin-bottom: 14px; box-shadow: var(--shadow-sm);
  scroll-margin-top: 96px;
}
.q-num {
  color: var(--orange-deep); font-family: "Oswald", sans-serif;
  font-size: 13px; font-weight: 600;
  text-transform: uppercase; letter-spacing: .14em;
}
.q-text {
  font-size: 18px; font-weight: 600; color: var(--navy-900);
  margin: 6px 0 16px; line-height: 1.4;
}
.q-choices { list-style: none; padding: 0; margin: 0 0 14px; }
.q-choices li {
  padding: 10px 14px; border: 1px solid var(--rule);
  border-radius: 4px; margin: 8px 0;
  display: flex; align-items: flex-start; gap: 12px;
  background: #fafbfd;
}
.q-choices li.correct {
  background: var(--green-50); border-color: #9ad1ad; color: var(--navy-900);
}
.q-choices li.correct::after {
  content: "✓"; margin-left: auto; color: var(--green); font-weight: 700;
}
.q-choices .letter {
  font-family: "Oswald", sans-serif; font-weight: 700;
  width: 24px; height: 24px; border-radius: 3px;
  background: var(--navy-900); color: #fff;
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 13px; flex-shrink: 0;
}
.q-choices li.correct .letter { background: var(--green); }
.q-correct {
  font-family: "Oswald", sans-serif; font-size: 13px;
  color: var(--green); font-weight: 600;
  text-transform: uppercase; letter-spacing: .1em;
}
.q-explain {
  color: var(--ink-soft); font-size: 14px; margin-top: 8px;
  padding: 10px 14px; background: var(--navy-50); border-left: 3px solid var(--navy-700);
  border-radius: 0 4px 4px 0;
}

/* Alert */
.alert {
  background: #fff8e6; border: 1px solid #f0d27a;
  padding: 14px 18px; border-radius: var(--radius);
  color: #5a4500; font-size: 14px;
  border-left: 4px solid var(--amber);
}
.alert strong { color: #3d2f00; }

/* Feature row (homepage) */
.feature-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
@media (max-width: 880px) { .feature-row { grid-template-columns: 1fr; } }
.feature {
  background: var(--paper); padding: 28px 26px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--rule); box-shadow: var(--shadow-sm);
  position: relative;
}
.feature .step {
  position: absolute; top: -18px; left: 24px;
  width: 36px; height: 36px;
  background: var(--orange); color: var(--navy-900);
  font-family: "Oswald", sans-serif; font-weight: 700; font-size: 18px;
  display: inline-flex; align-items: center; justify-content: center;
  border-radius: 4px; box-shadow: 0 4px 0 var(--orange-deep);
}
.feature h3 { margin: 8px 0 8px; font-size: 20px; }
.feature p { color: var(--ink-soft); margin: 0; }

/* Stats bar */
.stats {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 0;
  background: var(--navy-900); color: #fff;
  border-radius: var(--radius-lg); overflow: hidden;
  box-shadow: var(--shadow);
}
@media (max-width: 720px) { .stats { grid-template-columns: 1fr 1fr; } }
.stats > div {
  padding: 22px 20px; text-align: center;
  border-right: 1px solid rgba(255,255,255,.08);
}
.stats > div:last-child { border-right: 0; }
.stats strong {
  display: block; color: var(--orange);
  font-family: "Oswald", sans-serif; font-size: 36px; line-height: 1;
  letter-spacing: .02em; margin-bottom: 6px;
}
.stats span { color: #c9d3e2; font-size: 13px; text-transform: uppercase; letter-spacing: .08em; }

/* Footer */
.site-footer {
  background: var(--navy-900); color: #c9d3e2;
  padding: 56px 0 0; margin-top: 80px;
  border-top: 4px solid var(--orange);
}
.footer-grid {
  display: grid; grid-template-columns: 1.5fr 1fr 1fr 1fr 1fr; gap: 32px;
  padding-bottom: 36px;
}
@media (max-width: 980px) { .footer-grid { grid-template-columns: 1fr 1fr 1fr; } }
@media (max-width: 600px) { .footer-grid { grid-template-columns: 1fr 1fr; } }
.footer-grid h4 { color: #fff; font-family: "Oswald", sans-serif; font-size: 14px; text-transform: uppercase; letter-spacing: .12em; margin: 0 0 14px; padding-bottom: 8px; border-bottom: 2px solid var(--orange); display: inline-block; padding-right: 12px; }
.footer-grid ul { list-style: none; padding: 0; margin: 0; }
.footer-grid li { padding: 4px 0; }
.footer-grid a { color: #c9d3e2; font-size: 14px; }
.footer-grid a:hover { color: var(--orange); text-decoration: none; }
.footer-tag { color: #8b9bb3; font-size: 14px; margin-top: 12px; max-width: 32ch; }
.footer-fine {
  color: #8b9bb3; font-size: 12px; padding: 22px 0;
  border-top: 1px solid rgba(255,255,255,.08);
}
.footer-fine .container { display: flex; justify-content: space-between; gap: 14px; flex-wrap: wrap; }

/* Tables */
.table-wrap { overflow-x: auto; border-radius: var(--radius-lg); border: 1px solid var(--rule); background: #fff; }
.data-table { width: 100%; border-collapse: collapse; font-size: 14px; }
.data-table th {
  text-align: left; background: var(--navy-50);
  font-family: "Oswald", sans-serif; font-size: 13px;
  text-transform: uppercase; letter-spacing: .08em; color: var(--navy-900);
  padding: 12px 14px; border-bottom: 2px solid var(--orange);
}
.data-table td { padding: 12px 14px; border-bottom: 1px solid var(--rule-soft); }
.data-table tr:last-child td { border-bottom: 0; }

/* Handbook row */
.handbook-row { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 8px; }
@media (max-width: 700px) { .handbook-row { grid-template-columns: 1fr; } }

/* Article / guide pages */
.article-hero {
  background: var(--navy-900);
  color: #fff;
  padding: 48px 0 40px;
  border-bottom: 4px solid var(--orange);
}
.article-hero .eyebrow { color: var(--orange); }
.article-hero h1 { color: #fff; margin: 6px 0 10px; }
.article-hero p { color: #c9d3e2; max-width: 64ch; }
.article-meta { display: flex; gap: 18px; margin-top: 16px; flex-wrap: wrap; color: #8b9bb3; font-size: 13px; font-family: "Oswald", sans-serif; letter-spacing: .06em; text-transform: uppercase; }

/* Dense state link cluster */
.link-cloud {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: 6px;
}
.link-cloud a {
  padding: 8px 12px; background: var(--paper); border: 1px solid var(--rule);
  border-radius: 4px; font-size: 14px; color: var(--navy-700);
}
.link-cloud a:hover { border-color: var(--orange); color: var(--orange-deep); text-decoration: none; }

/* CTA strip */
.cta-strip {
  background: linear-gradient(90deg, var(--orange) 0%, var(--orange-deep) 100%);
  color: var(--navy-900);
  padding: 36px 0;
  border-radius: var(--radius-lg);
  margin: 32px 0;
}
.cta-strip .container { display: flex; align-items: center; justify-content: space-between; gap: 20px; flex-wrap: wrap; }
.cta-strip h3 { color: var(--navy-900); margin: 0; font-size: 26px; }
.cta-strip p { margin: 4px 0 0; color: var(--navy-800); }

/* Skip-link a11y */
.skip-link { position: absolute; left: -9999px; top: 0; background: var(--orange); color: var(--navy-900); padding: 10px 14px; font-weight: 700; z-index: 100; }
.skip-link:focus { left: 8px; top: 8px; }

/* Focus ring */
:focus-visible { outline: 3px solid var(--orange); outline-offset: 2px; border-radius: 3px; }