/* Tuulzone Hackathon Landing — tuulzone CI */
:root {
  --navy: #1A223E;
  --navy-dark: #0A0E19;
  --orange: #F49927;
  --orange-active: #CC4400;
  --paper: #F9F9F9;
  --paper-alt: #ECEDF0;
  --border: #C4C6CC;
  --text: #1A223E;
  --text-muted: #4A5068;
  --text-on-dark: #ECEDF0;
  --max-w: 72rem;
  --radius: 0.5rem;
  --shadow: 0 4px 24px rgba(10, 14, 25, 0.08);
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2.5rem;
  --space-xl: 4rem;
  --font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  margin: 0;
  font-family: var(--font);
  font-size: 1.0625rem;
  line-height: 1.6;
  color: var(--text);
  background: var(--navy-dark);
  background-image:
    linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
  background-size: 24px 24px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: var(--space-sm);
  z-index: 100;
  padding: 0.75rem 1rem;
  background: var(--orange);
  color: var(--navy-dark);
  font-weight: 600;
  text-decoration: none;
  border-radius: var(--radius);
}
.skip-link:focus {
  left: var(--space-sm);
  outline: 3px solid var(--orange);
  outline-offset: 2px;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.wrap { width: min(100% - 2rem, var(--max-w)); margin-inline: auto; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(26, 34, 62, 0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid rgba(196, 198, 204, 0.2);
}
.header-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-sm);
  padding: var(--space-sm) 0;
}
.brand { display: flex; align-items: center; gap: var(--space-sm); text-decoration: none; color: var(--text-on-dark); }
.brand img { height: 2rem; width: auto; }
.brand-title { font-size: 0.75rem; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase; }
.nav { display: flex; flex-wrap: wrap; gap: 0.25rem 1rem; }
.nav a {
  color: var(--text-on-dark);
  text-decoration: none;
  font-size: 0.9375rem;
  font-weight: 500;
  padding: 0.5rem 0.25rem;
  border-radius: 4px;
}
.nav a:hover { color: var(--orange); }
.nav a:focus-visible { outline: 2px solid var(--orange); outline-offset: 2px; }

.hero {
  padding: var(--space-xl) 0 var(--space-lg);
  color: var(--text-on-dark);
}
.hero-grid {
  display: grid;
  gap: var(--space-lg);
  align-items: start;
}
@media (min-width: 960px) {
  .hero-grid { grid-template-columns: 1.2fr 0.8fr; }
}
.eyebrow {
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--orange);
  margin: 0 0 var(--space-sm);
}
.hero h1 {
  font-size: clamp(2rem, 5vw, 3.25rem);
  line-height: 1.1;
  font-weight: 800;
  margin: 0 0 var(--space-md);
  letter-spacing: -0.02em;
}
.lead { font-size: 1.125rem; max-width: 38ch; color: rgba(236, 237, 240, 0.9); margin: 0 0 var(--space-md); }
.cta-row { display: flex; flex-wrap: wrap; gap: var(--space-sm); margin-bottom: var(--space-md); }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0.75rem 1.25rem;
  font-weight: 600;
  font-size: 1rem;
  text-decoration: none;
  border-radius: var(--radius);
  border: 2px solid transparent;
  transition: transform 0.2s, box-shadow 0.2s;
}
.btn-primary { background: var(--orange); color: var(--navy-dark); }
.btn-primary:hover { background: var(--orange-active); color: #fff; transform: translateY(-1px); box-shadow: var(--shadow); }
.btn-secondary { background: transparent; color: var(--text-on-dark); border-color: rgba(236,237,240,0.4); }
.btn-secondary:hover { border-color: var(--orange); color: var(--orange); }
.btn:focus-visible { outline: 3px solid var(--orange); outline-offset: 2px; }

.build-sheet {
  background: rgba(249, 249, 249, 0.06);
  border: 1px solid rgba(196, 198, 204, 0.25);
  border-radius: calc(var(--radius) + 4px);
  padding: var(--space-md);
}
.build-sheet h2 { font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.1em; margin: 0 0 var(--space-sm); color: var(--orange); }
.facts { list-style: none; padding: 0; margin: 0; }
.facts li {
  display: flex;
  justify-content: space-between;
  gap: var(--space-sm);
  padding: 0.65rem 0;
  border-bottom: 1px solid rgba(196, 198, 204, 0.15);
  font-size: 0.9375rem;
}
.facts li:last-child { border-bottom: none; }
.facts strong { color: #fff; font-weight: 600; }
.chips { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-top: var(--space-sm); }
.chip {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.35rem 0.65rem;
  border-radius: 999px;
  background: rgba(244, 153, 39, 0.15);
  color: var(--orange);
  border: 1px solid rgba(244, 153, 39, 0.35);
}

section { padding: var(--space-xl) 0; }
section.paper {
  background: var(--paper);
  color: var(--text);
}
section.navy-band {
  background: var(--navy);
  color: var(--text-on-dark);
}
.section-head { margin-bottom: var(--space-lg); max-width: 42rem; }
.section-head h2 {
  font-size: clamp(1.75rem, 3vw, 2.25rem);
  margin: 0 0 var(--space-sm);
  letter-spacing: -0.02em;
}
.section-head p { margin: 0; color: var(--text-muted); }
section.navy-band .section-head p { color: rgba(236, 237, 240, 0.75); }

.principles {
  display: grid;
  gap: var(--space-md);
  grid-template-columns: 1fr;
}
@media (min-width: 640px) { .principles { grid-template-columns: repeat(3, 1fr); } }
.card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-md);
  box-shadow: var(--shadow);
}
.card-num {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--orange-active);
  letter-spacing: 0.08em;
  margin-bottom: 0.5rem;
}
.card h3 { margin: 0 0 0.5rem; font-size: 1.125rem; }
.card p { margin: 0; font-size: 0.9375rem; color: var(--text-muted); }
.mission-note {
  margin-top: var(--space-lg);
  padding: var(--space-md);
  background: var(--paper-alt);
  border-left: 4px solid var(--orange);
  border-radius: 0 var(--radius) var(--radius) 0;
  font-size: 0.9375rem;
}

.timeline { list-style: none; padding: 0; margin: 0; }
.timeline li {
  display: grid;
  gap: 0.25rem 1rem;
  padding: var(--space-sm) 0;
  border-left: 2px solid var(--border);
  padding-left: var(--space-md);
  margin-left: 0.5rem;
  position: relative;
}
.timeline li::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 1.25rem;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--orange);
}
@media (min-width: 640px) {
  .timeline li { grid-template-columns: 5rem 1fr; border-left: none; padding-left: 0; margin-left: 0; }
  .timeline li::before { display: none; }
  .timeline .time { font-weight: 700; color: var(--orange-active); font-variant-numeric: tabular-nums; }
}

.challenge-grid {
  display: grid;
  gap: var(--space-md);
  grid-template-columns: 1fr;
}
@media (min-width: 768px) { .challenge-grid { grid-template-columns: repeat(2, 1fr); } }
.challenge-card { background: rgba(255,255,255,0.04); border: 1px solid rgba(196,198,204,0.25); border-radius: var(--radius); padding: var(--space-md); }
.challenge-card h3 { margin: 0 0 0.75rem; font-size: 1.125rem; color: #fff; }
.challenge-card dl { margin: 0; font-size: 0.875rem; }
.challenge-card dt { font-weight: 700; color: var(--orange); margin-top: 0.5rem; }
.challenge-card dt:first-of-type { margin-top: 0; }
.challenge-card dd { margin: 0.25rem 0 0; color: rgba(236,237,240,0.85); }
.challenge-card.open { border-style: dashed; border-color: var(--orange); }

.tool-grid { display: grid; gap: var(--space-md); grid-template-columns: 1fr; }
@media (min-width: 640px) { .tool-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1024px) { .tool-grid { grid-template-columns: repeat(3, 1fr); } }
.tool-card h3 { margin: 0 0 0.5rem; font-size: 1rem; }
.security-note {
  margin-top: var(--space-lg);
  font-size: 0.875rem;
  padding: var(--space-sm) var(--space-md);
  background: var(--navy-dark);
  color: var(--text-on-dark);
  border-radius: var(--radius);
}

.demo-grid {
  display: grid;
  gap: var(--space-sm);
  grid-template-columns: repeat(2, 1fr);
}
@media (min-width: 640px) { .demo-grid { grid-template-columns: repeat(3, 1fr); } }
@media (min-width: 1024px) { .demo-grid { grid-template-columns: repeat(4, 1fr); } }
.demo-card {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  text-decoration: none;
  color: inherit;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-md);
  min-height: 44px;
  transition: transform 0.2s, border-color 0.2s, box-shadow 0.2s;
}
.demo-card:hover { border-color: var(--orange); transform: translateY(-2px); box-shadow: var(--shadow); }
.demo-card:focus-visible { outline: 3px solid var(--orange); outline-offset: 2px; }
.demo-card strong { font-size: 1rem; }
.demo-card span { font-size: 0.8125rem; color: var(--text-muted); margin-top: 0.25rem; }

.faq { max-width: 48rem; }
.faq details {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: var(--space-sm);
  background: #fff;
  padding: 0;
}
.faq summary {
  cursor: pointer;
  font-weight: 600;
  padding: var(--space-sm) var(--space-md);
  list-style: none;
  min-height: 44px;
  display: flex;
  align-items: center;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; margin-left: auto; color: var(--orange); font-weight: 700; }
.faq details[open] summary::after { content: "−"; }
.faq details[open] summary { border-bottom: 1px solid var(--border); }
.faq .faq-body { padding: var(--space-sm) var(--space-md) var(--space-md); font-size: 0.9375rem; color: var(--text-muted); }

.site-footer {
  padding: var(--space-lg) 0;
  background: var(--navy-dark);
  color: rgba(236, 237, 240, 0.7);
  font-size: 0.875rem;
  text-align: center;
  border-top: 1px solid rgba(196, 198, 204, 0.15);
}
.site-footer a { color: var(--orange); }
.site-footer .tagline { font-weight: 700; color: #fff; font-size: 1rem; margin-bottom: var(--space-sm); }

@media print {
  body { background: #fff; color: #000; background-image: none; }
  .site-header, .nav, .cta-row, .demo-grid, .skip-link { display: none !important; }
  section { padding: 1rem 0; break-inside: avoid; }
  .challenge-card, .timeline li { break-inside: avoid; }
  a[href^="http"]::after { content: " (" attr(href) ")"; font-size: 0.8em; }
  .demo-grid { display: none; }
}