/* =====================================================
   Ham Radio Start — styles.css
   Aesthetic: Technical Editorial — dark navy base,
   amber signal accent, clean mono headlines,
   feels like a well-designed field manual.
   ===================================================== */

@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:wght@400;600;700&family=IBM+Plex+Sans:ital,wght@0,300;0,400;0,600;1,300&display=swap');

:root {
  --navy:    #0d1b2a;
  --navy2:   #152336;
  --navy3:   #1e3050;
  --amber:   #f5a623;
  --amber2:  #ffc857;
  --white:   #f4f1eb;
  --gray:    #8a99a8;
  --lgray:   #cdd5dc;
  --green:   #4caf82;
  --red:     #e05c5c;
  --font-mono: 'IBM Plex Mono', monospace;
  --font-body: 'IBM Plex Sans', sans-serif;
  --max:     1100px;
  --radius:  4px;
  --shadow:  0 2px 16px rgba(0,0,0,0.35);
}

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

html { scroll-behavior: smooth; font-size: 16px; }

body {
  background: var(--navy);
  color: var(--white);
  font-family: var(--font-body);
  font-weight: 300;
  line-height: 1.7;
  min-height: 100vh;
}

/* ── TYPOGRAPHY ── */
h1, h2, h3, h4 {
  font-family: var(--font-mono);
  font-weight: 700;
  line-height: 1.2;
  color: var(--white);
}
h1 { font-size: clamp(1.8rem, 4vw, 2.8rem); }
h2 { font-size: clamp(1.3rem, 3vw, 1.9rem); margin-bottom: 0.75rem; }
h3 { font-size: 1.15rem; margin-bottom: 0.5rem; color: var(--amber2); }
h4 { font-size: 1rem; color: var(--lgray); font-weight: 600; }

p  { margin-bottom: 1.1rem; color: var(--lgray); }
a  { color: var(--amber); text-decoration: none; }
a:hover { color: var(--amber2); text-decoration: underline; }
ul, ol { padding-left: 1.4rem; margin-bottom: 1.1rem; color: var(--lgray); }
li { margin-bottom: 0.4rem; }
strong { color: var(--white); font-weight: 600; }
em { color: var(--amber2); font-style: italic; }
hr { border: none; border-top: 1px solid var(--navy3); margin: 2.5rem 0; }

/* ── LAYOUT ── */
.container { max-width: var(--max); margin: 0 auto; padding: 0 1.25rem; }
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; }
.three-col { display: grid; grid-template-columns: repeat(3,1fr); gap: 1.5rem; }
@media(max-width:768px) {
  .two-col, .three-col { grid-template-columns: 1fr; }
}

/* ── HEADER / NAV ── */
header {
  background: var(--navy);
  border-bottom: 2px solid var(--amber);
  position: sticky; top: 0; z-index: 100;
}
.nav-inner {
  display: flex; align-items: center; justify-content: space-between;
  padding: 0.85rem 1.25rem; max-width: var(--max); margin: 0 auto;
}
.logo {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--white);
  letter-spacing: -0.02em;
}
.logo span { color: var(--amber); }
nav { display: flex; gap: 0.25rem; flex-wrap: wrap; }
nav a {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--gray);
  padding: 0.4rem 0.65rem;
  border-radius: var(--radius);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  transition: color 0.15s, background 0.15s;
}
nav a:hover, nav a.active {
  color: var(--amber);
  background: rgba(245,166,35,0.1);
  text-decoration: none;
}
.nav-toggle { display: none; background: none; border: none; color: var(--amber); font-size: 1.4rem; cursor: pointer; }
@media(max-width:700px) {
  .nav-toggle { display: block; }
  nav { display: none; flex-direction: column; position: absolute; top: 100%; left: 0; right: 0;
    background: var(--navy2); border-bottom: 2px solid var(--amber); padding: 1rem 1.25rem; }
  nav.open { display: flex; }
  nav a { font-size: 0.85rem; padding: 0.6rem 0; }
}

/* ── HERO ── */
.hero {
  background: linear-gradient(135deg, var(--navy) 0%, var(--navy2) 60%, var(--navy3) 100%);
  padding: 5rem 1.25rem 4rem;
  position: relative; overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute; top: 0; left: 0; right: 0; bottom: 0;
  background-image:
    radial-gradient(circle at 20% 50%, rgba(245,166,35,0.06) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(76,175,130,0.04) 0%, transparent 40%);
  pointer-events: none;
}
.hero-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--amber);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  margin-bottom: 1rem;
  display: flex; align-items: center; gap: 0.5rem;
}
.hero-label::before { content: '▶'; font-size: 0.6rem; }
.hero h1 { max-width: 720px; margin-bottom: 1.25rem; }
.hero h1 em { color: var(--amber); font-style: normal; }
.hero p.lead {
  font-size: 1.1rem;
  color: var(--lgray);
  max-width: 600px;
  margin-bottom: 2rem;
  font-weight: 300;
}
.btn-row { display: flex; gap: 1rem; flex-wrap: wrap; }

/* ── BUTTONS ── */
.btn {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius);
  border: none; cursor: pointer;
  transition: transform 0.15s, box-shadow 0.15s;
  display: inline-block;
  text-decoration: none;
}
.btn:hover { transform: translateY(-1px); text-decoration: none; }
.btn-primary { background: var(--amber); color: var(--navy); }
.btn-primary:hover { background: var(--amber2); color: var(--navy); box-shadow: 0 4px 16px rgba(245,166,35,0.35); }
.btn-outline { background: transparent; color: var(--amber); border: 2px solid var(--amber); }
.btn-outline:hover { background: rgba(245,166,35,0.1); color: var(--amber2); }
.btn-green { background: var(--green); color: var(--navy); }
.btn-green:hover { background: #5dc898; color: var(--navy); }

/* ── SIGNAL STRIP (decorative section divider) ── */
.signal-strip {
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--amber), var(--amber2), var(--amber), transparent);
  margin: 0;
}

/* ── CARDS ── */
.card {
  background: var(--navy2);
  border: 1px solid var(--navy3);
  border-radius: var(--radius);
  padding: 1.5rem;
  transition: border-color 0.2s, transform 0.2s;
}
.card:hover { border-color: var(--amber); transform: translateY(-2px); }
.card-icon {
  font-size: 1.6rem; margin-bottom: 0.75rem;
  display: block;
}
.card h3 { font-size: 1rem; margin-bottom: 0.5rem; }
.card p { font-size: 0.9rem; margin-bottom: 0; }

/* ── STEP BOXES ── */
.steps { list-style: none; padding: 0; counter-reset: step; }
.steps li {
  counter-increment: step;
  display: flex; gap: 1.25rem;
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--navy3);
}
.steps li:last-child { border-bottom: none; }
.step-num {
  flex-shrink: 0;
  width: 2.25rem; height: 2.25rem;
  background: var(--amber);
  color: var(--navy);
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.9rem;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
}
.step-body h4 { color: var(--white); font-family: var(--font-mono); margin-bottom: 0.3rem; }
.step-body p { font-size: 0.93rem; margin-bottom: 0; }

/* ── FAQ ── */
.faq { margin: 0; padding: 0; list-style: none; }
.faq-item {
  border-bottom: 1px solid var(--navy3);
}
.faq-q {
  font-family: var(--font-mono);
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--white);
  padding: 1.1rem 0;
  cursor: pointer;
  display: flex; justify-content: space-between; align-items: center;
  gap: 1rem;
  user-select: none;
}
.faq-q::after { content: '+'; color: var(--amber); font-size: 1.2rem; flex-shrink: 0; }
.faq-item.open .faq-q::after { content: '−'; }
.faq-a {
  display: none;
  padding: 0 0 1.1rem;
  font-size: 0.93rem;
  color: var(--lgray);
  line-height: 1.65;
}
.faq-item.open .faq-a { display: block; }

/* ── BREADCRUMB ── */
.breadcrumb {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--gray);
  padding: 0.75rem 0;
  margin-bottom: 0.5rem;
}
.breadcrumb a { color: var(--gray); }
.breadcrumb a:hover { color: var(--amber); }
.breadcrumb span { color: var(--amber); }

/* ── ARTICLE LAYOUT ── */
.article-wrap {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 3rem;
  align-items: start;
  padding: 3rem 1.25rem;
  max-width: var(--max);
  margin: 0 auto;
}
@media(max-width:900px) { .article-wrap { grid-template-columns: 1fr; } }
.article-body h2 { margin-top: 2rem; padding-top: 1.5rem; border-top: 1px solid var(--navy3); }
.article-body h2:first-child { margin-top: 0; border-top: none; padding-top: 0; }
.article-body h3 { margin-top: 1.5rem; }

/* ── SIDEBAR ── */
.sidebar { position: sticky; top: 5rem; }
.sidebar-box {
  background: var(--navy2);
  border: 1px solid var(--navy3);
  border-radius: var(--radius);
  padding: 1.25rem;
  margin-bottom: 1.5rem;
}
.sidebar-box h4 {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--amber);
  margin-bottom: 1rem;
  border-bottom: 1px solid var(--navy3);
  padding-bottom: 0.5rem;
}
.sidebar-box ul { list-style: none; padding: 0; margin: 0; }
.sidebar-box li { padding: 0.35rem 0; border-bottom: 1px solid var(--navy3); }
.sidebar-box li:last-child { border-bottom: none; }
.sidebar-box a { font-size: 0.88rem; color: var(--lgray); }
.sidebar-box a:hover { color: var(--amber); }
.toc-link { font-size: 0.85rem; }

/* ── INFO BOX / CALLOUT ── */
.callout {
  border-left: 3px solid var(--amber);
  background: rgba(245,166,35,0.07);
  padding: 1rem 1.25rem;
  border-radius: 0 var(--radius) var(--radius) 0;
  margin: 1.5rem 0;
}
.callout.green { border-color: var(--green); background: rgba(76,175,130,0.07); }
.callout.red { border-color: var(--red); background: rgba(224,92,92,0.07); }
.callout p { margin-bottom: 0; font-size: 0.93rem; }
.callout strong { color: var(--amber); }
.callout.green strong { color: var(--green); }
.callout.red strong { color: var(--red); }

/* ── TABLE ── */
table { width: 100%; border-collapse: collapse; margin: 1.5rem 0; font-size: 0.9rem; }
th {
  background: var(--navy3);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--amber);
  padding: 0.75rem 1rem;
  text-align: left;
}
td { padding: 0.7rem 1rem; border-bottom: 1px solid var(--navy3); color: var(--lgray); vertical-align: top; }
tr:last-child td { border-bottom: none; }

/* ── CHECKLIST ── */
.checklist { list-style: none; padding: 0; }
.checklist li {
  display: flex; align-items: flex-start; gap: 0.75rem;
  padding: 0.6rem 0; border-bottom: 1px solid var(--navy3);
}
.checklist li:last-child { border-bottom: none; }
.checklist li::before {
  content: '□';
  font-size: 1.1rem; color: var(--amber);
  flex-shrink: 0; margin-top: 0.05rem;
  font-family: var(--font-mono);
}

/* ── PAGE HERO (inner pages) ── */
.page-hero {
  background: var(--navy2);
  border-bottom: 1px solid var(--navy3);
  padding: 2.5rem 1.25rem 2rem;
}
.page-hero-inner { max-width: var(--max); margin: 0 auto; }
.page-hero .tag {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--amber);
  margin-bottom: 0.75rem;
  display: block;
}
.page-hero h1 { font-size: clamp(1.4rem, 3.5vw, 2.2rem); margin-bottom: 0.75rem; }
.page-hero .lead { font-size: 1rem; max-width: 640px; margin-bottom: 0; }

/* ── SECTION WRAPPERS ── */
.section { padding: 3.5rem 1.25rem; }
.section-alt { background: var(--navy2); }
.section-title {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--amber);
  margin-bottom: 0.5rem;
}

/* ── TOOL WIDGET ── */
.tool-wrap {
  background: var(--navy2);
  border: 1px solid var(--navy3);
  border-radius: var(--radius);
  padding: 2rem;
  max-width: 640px;
  margin: 0 auto;
}
.tool-wrap h3 { color: var(--amber2); margin-bottom: 1.5rem; }
.tool-question { margin-bottom: 1.5rem; }
.tool-question label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--lgray);
  margin-bottom: 0.5rem;
}
.tool-options { display: flex; flex-direction: column; gap: 0.5rem; }
.tool-option {
  display: flex; align-items: center; gap: 0.75rem;
  padding: 0.6rem 0.85rem;
  border: 1px solid var(--navy3);
  border-radius: var(--radius);
  cursor: pointer;
  transition: border-color 0.15s;
  font-size: 0.9rem;
  color: var(--lgray);
}
.tool-option input[type=radio] { accent-color: var(--amber); }
.tool-option:hover { border-color: var(--amber); }
.tool-result {
  background: var(--navy3);
  border: 1px solid var(--amber);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin-top: 1.5rem;
  display: none;
}
.tool-result.visible { display: block; }
.tool-result h4 { color: var(--amber2); margin-bottom: 1rem; }
.tool-result .checklist li::before { content: '☐'; }

/* ── FOOTER ── */
footer {
  background: var(--navy);
  border-top: 2px solid var(--navy3);
  padding: 3rem 1.25rem 2rem;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 2.5rem;
  max-width: var(--max);
  margin: 0 auto 2.5rem;
}
@media(max-width:768px) { .footer-grid { grid-template-columns: 1fr 1fr; } }
@media(max-width:480px) { .footer-grid { grid-template-columns: 1fr; } }
.footer-brand p { font-size: 0.88rem; color: var(--gray); margin-top: 0.5rem; margin-bottom: 0; }
footer h5 {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--amber);
  margin-bottom: 0.85rem;
}
footer ul { list-style: none; padding: 0; margin: 0; }
footer li { margin-bottom: 0.4rem; }
footer a { font-size: 0.88rem; color: var(--gray); }
footer a:hover { color: var(--amber); }
.footer-bottom {
  border-top: 1px solid var(--navy3);
  padding-top: 1.25rem;
  max-width: var(--max);
  margin: 0 auto;
  display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 0.75rem;
  font-size: 0.78rem;
  color: var(--gray);
  font-family: var(--font-mono);
}
.footer-bottom a { color: var(--gray); }
.footer-bottom a:hover { color: var(--amber); }

/* ── DISCLAIMER ── */
.disclaimer {
  font-size: 0.82rem;
  color: var(--gray);
  border-top: 1px solid var(--navy3);
  margin-top: 2rem;
  padding-top: 1.25rem;
  font-style: italic;
}

/* ── UTILITY ── */
.text-amber { color: var(--amber); }
.text-green { color: var(--green); }
.text-gray  { color: var(--gray); }
.mono { font-family: var(--font-mono); }
.small { font-size: 0.85rem; }
.mt1 { margin-top: 1rem; }
.mt2 { margin-top: 2rem; }
.mb1 { margin-bottom: 1rem; }
.mb2 { margin-bottom: 2rem; }
.centered { text-align: center; }