/* UbiqAir — site styles
   Loads after tokens.css. Set up base, layout, components. */

/* ===== Reset ===== */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
img, svg, video { display: block; max-width: 100%; height: auto; }
button { background: none; border: none; padding: 0; font: inherit; cursor: pointer; color: inherit; }
ul, ol { list-style: none; }
a { color: inherit; text-decoration: none; transition: color var(--duration-base) var(--ease-out); }

/* ===== Base ===== */
body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
:focus-visible {
  outline: 2px solid var(--color-blue);
  outline-offset: 2px;
}

/* ===== Typography ===== */
h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tight);
}
h1 { font-size: var(--text-2xl); color: var(--color-heading); }
h2 { font-size: clamp(1.75rem, 1.25rem + 1.6vw, var(--text-xl)); color: var(--color-text); }
h3 { font-size: var(--text-lg); line-height: var(--leading-snug); color: var(--color-heading); }

p { margin-bottom: var(--space-3); max-width: var(--content-text); }
p:last-child { margin-bottom: 0; }
p.lead { font-size: var(--text-md); color: var(--color-text-muted); max-width: 60ch; }
p a, .bullet-list a { color: var(--color-link); text-decoration: underline; text-underline-offset: 2px; }
p a:hover, .bullet-list a:hover { color: var(--color-link-hover); }

/* Eyebrow, led by a strip of four logo tiles. */
.eyebrow {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-sans);
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-blue);
  letter-spacing: var(--tracking-widest);
  text-transform: uppercase;
}
.eyebrow::before {
  content: '';
  flex-shrink: 0;
  width: 28px;
  height: 6px;
  border-radius: 1px;
  background: linear-gradient(90deg,
    var(--color-green) 0 25%, var(--color-cyan) 25% 50%,
    var(--color-orange) 50% 75%, var(--color-red) 75% 100%);
}

/* ===== Layout ===== */
.container {
  max-width: var(--content-max);
  margin: 0 auto;
  padding-left: var(--space-4);
  padding-right: var(--space-4);
}
section { padding: var(--space-8) 0; }
.section-soft { background: var(--color-bg-soft); }
/* Sticky header offset so anchor jumps don't land under it.
   Header height ≈ logo + 2*space-3 padding (logo: 64px desktop, 56px <900, 48px <720). */
section[id] { scroll-margin-top: 96px; }
@media (max-width: 900px) { section[id] { scroll-margin-top: 88px; } }
@media (max-width: 720px) { section[id] { scroll-margin-top: 80px; } }

/* ===== Header ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: saturate(1.5) blur(12px);
  -webkit-backdrop-filter: saturate(1.5) blur(12px);
  border-bottom: 1px solid var(--color-border);
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-2);
  padding-bottom: var(--space-2);
  gap: var(--space-4);
}
.site-logo { display: flex; align-items: center; flex-shrink: 0; }
.site-logo img { height: 64px; width: auto; }
.site-nav {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  position: relative;
}
.site-nav-links {
  display: flex;
  gap: var(--space-5);
  align-items: center;
  flex-wrap: wrap;
}
.site-nav a {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text);
}
.site-nav a:hover { color: var(--color-blue); }
.lang-toggle {
  font-size: var(--text-xs);
  letter-spacing: var(--tracking-wide);
  color: var(--color-text-muted);
  padding: 8px 12px;
  border: 1px solid var(--color-border-hover);
  border-radius: var(--radius-pill);
  line-height: 1;
}
.site-nav .lang-toggle:hover {
  border-color: var(--color-blue);
  color: var(--color-blue);
}
.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  color: var(--color-text);
}
.nav-toggle:hover { background: rgba(29, 98, 252, 0.06); }
.burger-icon,
.burger-icon::before,
.burger-icon::after {
  display: block;
  width: 22px;
  height: 2px;
  background: currentColor;
  transition: transform var(--duration-base) var(--ease-out),
              opacity var(--duration-base) var(--ease-out),
              top var(--duration-base) var(--ease-out);
}
.burger-icon { position: relative; }
.burger-icon::before,
.burger-icon::after {
  content: '';
  position: absolute;
  left: 0;
}
.burger-icon::before { top: -6px; }
.burger-icon::after  { top: 6px; }
.nav-toggle[aria-expanded="true"] .burger-icon { background: transparent; }
.nav-toggle[aria-expanded="true"] .burger-icon::before { top: 0; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] .burger-icon::after  { top: 0; transform: rotate(-45deg); }

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 28px;
  border-radius: var(--radius-pill);
  font-family: var(--font-sans);
  font-size: var(--text-base);
  font-weight: 500;
  line-height: 1;
  transition: background-color var(--duration-base) var(--ease-out),
              box-shadow var(--duration-base) var(--ease-out),
              transform var(--duration-base) var(--ease-out);
}
.btn-primary {
  background: var(--color-blue);
  color: var(--color-white);
  box-shadow: 0 4px 14px rgba(29, 98, 252, 0.28);
}
.btn-primary:hover {
  background: var(--color-blue-deep);
  color: var(--color-white);
  transform: translateY(-1px);
  box-shadow: 0 8px 20px rgba(29, 98, 252, 0.32);
}
.btn:active { transform: translateY(0); }

/* ===== Hero ===== */
/* Desktop: the banner fills the section and the copy sits in a frosted panel
   over its mosaic half. Mobile: the square crop stacks above the copy. */
.hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  display: flex;
  align-items: center;
  min-height: clamp(380px, 36vw, 600px);
  padding: var(--space-6) 0;
}
.hero-media {
  position: absolute;
  inset: 0;
  z-index: -1;
}
.hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 70% center;
}
.hero-content { width: 100%; }
.hero-panel {
  max-width: min(540px, 52%);
  padding: var(--space-5);
  background: rgba(255, 255, 255, 0.74);
  backdrop-filter: blur(6px) saturate(1.2);
  -webkit-backdrop-filter: blur(6px) saturate(1.2);
  border: 1px solid rgba(255, 255, 255, 0.6);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
}
.hero h1 {
  font-size: clamp(1.75rem, 1rem + 2.1vw, 2.75rem);
  margin: var(--space-3) 0 var(--space-4);
}
@media (max-width: 759px) {
  .hero {
    display: block;
    min-height: 0;
    padding: 0 0 var(--space-3);
  }
  .hero-media { position: static; }
  .hero-media img { height: auto; }
  .hero-panel {
    max-width: none;
    padding: var(--space-5) 0 0;
    background: none;
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    border: none;
    box-shadow: none;
  }
}

/* ===== Intro ===== */
section.intro { padding-top: var(--space-7); padding-bottom: 0; }
.intro-lead {
  font-family: var(--font-display);
  font-size: clamp(1.25rem, 1rem + 1vw, 1.75rem);
  line-height: var(--leading-snug);
  max-width: 44ch;
  margin-bottom: var(--space-4);
}
.intro-lead strong { color: var(--color-blue); }

/* ===== Section header ===== */
.section-header { max-width: var(--content-narrow); margin-bottom: var(--space-6); }
.section-header h2 { margin: var(--space-3) 0 var(--space-4); }
.section-header .aside {
  font-family: var(--font-display);
  font-style: italic;
  font-size: var(--text-md);
  color: var(--color-blue);
}

/* ===== Feature rows (How it works) ===== */
.feature {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  gap: var(--space-7);
  align-items: center;
}
.feature + .feature { margin-top: var(--space-8); }
.feature--reverse .feature-media { order: 2; }
.feature-media img { margin: 0 auto; }
.feature-media img:not(.screenshot) { max-width: 400px; width: 100%; }
.feature-text h3 {
  font-size: clamp(1.5rem, 1.2rem + 1vw, 2rem);
  margin-bottom: var(--space-4);
}
.screenshot {
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-lg);
}
@media (max-width: 900px) {
  .feature,
  .feature--reverse {
    grid-template-columns: minmax(0, 1fr);
    gap: var(--space-5);
  }
  .feature--reverse .feature-media { order: 0; }
  .feature + .feature { margin-top: var(--space-7); }
  .feature-media img:not(.screenshot) { max-width: 280px; }
}

/* ===== CO₂ chart ===== */
.chart {
  background: var(--color-bg-card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  padding: var(--space-5);
}
.chart figcaption {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--space-3);
  margin-top: var(--space-4);
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-border);
  font-size: var(--text-sm);
}
.chart details { flex: 1 1 32ch; }
.chart summary {
  cursor: pointer;
  color: var(--color-link);
  font-weight: 500;
}
.chart summary:hover { color: var(--color-link-hover); }
.chart details .bullet-list { margin-top: var(--space-3); max-width: 72ch; }
.chart-source { color: var(--color-text-subtle); }
@media (max-width: 720px) {
  .chart { padding: var(--space-3); }
}

/* ===== Lists ===== */
/* Bullets are small logo tiles; cards set --accent to pick the colour. */
.bullet-list li {
  position: relative;
  padding-left: var(--space-4);
  margin-bottom: var(--space-2);
}
.bullet-list li:last-child { margin-bottom: 0; }
.bullet-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 8px;
  height: 8px;
  border-radius: 2px;
  background: var(--accent, var(--color-blue));
}

/* ===== Benefits ===== */
.benefit-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-4);
}
.benefit-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-top: 4px solid var(--accent);
  border-radius: var(--radius-md);
  padding: var(--space-5);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--duration-base) var(--ease-out),
              transform var(--duration-base) var(--ease-out);
}
.benefit-card:hover { box-shadow: var(--shadow-hover); transform: translateY(-2px); }
.benefit-card h3 { margin-bottom: var(--space-4); }
.benefit-card--blue   { --accent: var(--color-blue); }
.benefit-card--green  { --accent: var(--color-green); }
.benefit-card--orange { --accent: var(--color-orange); }
@media (max-width: 900px) {
  .benefit-grid { grid-template-columns: minmax(0, 1fr); }
}

/* ===== Closing call to action ===== */
section.closing { padding-top: 0; text-align: center; }
.closing h2 { margin-bottom: var(--space-5); }
.closing-art { margin-top: var(--space-7); }

/* ===== Footer ===== */
.site-footer {
  background: var(--color-night);
  color: rgba(255, 255, 255, 0.86);
  padding: var(--space-7) 0 var(--space-4);
  font-size: var(--text-sm);
}
.footer-grid {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) minmax(0, 1fr);
  gap: var(--space-7);
  align-items: start;
}
.footer-logo { height: 72px; width: auto; }
.footer-heading {
  font-family: var(--font-sans);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: var(--tracking-widest);
  text-transform: uppercase;
  color: var(--color-cyan);
  margin-bottom: var(--space-2);
}
.site-footer p a { color: var(--color-white); }
.site-footer p a:hover { color: var(--color-cyan); }
.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-5);
  margin-top: var(--space-6);
  padding-top: var(--space-4);
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  font-size: var(--text-xs);
  color: rgba(255, 255, 255, 0.6);
}
@media (max-width: 720px) {
  .footer-grid { grid-template-columns: minmax(0, 1fr); gap: var(--space-5); }
  .footer-logo { height: 56px; }
}

/* ===== Not-found page ===== */
.not-found { text-align: center; padding: var(--space-8) 0; }
.not-found h1 { margin: var(--space-3) 0 var(--space-4); }
.not-found .eyebrow { justify-content: center; }
.not-found p { margin-left: auto; margin-right: auto; }
.not-found-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-3);
  margin-top: var(--space-5);
}

/* ===== Responsive ===== */
/* Header: scale logo down a step earlier so nav fits on iPad-portrait without wrapping. */
@media (max-width: 900px) {
  section { padding: var(--space-7) 0; }
  .site-logo img { height: 56px; }
  .site-nav-links { gap: var(--space-4); }
}
@media (max-width: 720px) {
  section { padding: var(--space-6) 0; }
  .container { padding-left: var(--space-3); padding-right: var(--space-3); }
  .site-logo img { height: 48px; }
}
@media (max-width: 720px) {
  .nav-toggle { display: inline-flex; }
  .site-nav-links {
    position: absolute;
    top: calc(100% + var(--space-2));
    right: 0;
    flex-direction: column;
    gap: 0;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: saturate(1.5) blur(12px);
    -webkit-backdrop-filter: saturate(1.5) blur(12px);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    padding: var(--space-2);
    min-width: 220px;
    visibility: hidden;
    opacity: 0;
    transform: translateY(-4px);
    transition: opacity var(--duration-base) var(--ease-out),
                transform var(--duration-base) var(--ease-out),
                visibility 0s linear var(--duration-base);
  }
  .site-nav-links[data-open="true"] {
    visibility: visible;
    opacity: 1;
    transform: translateY(0);
    transition: opacity var(--duration-base) var(--ease-out),
                transform var(--duration-base) var(--ease-out);
  }
  .site-nav-links li { width: 100%; }
  .site-nav-links a {
    display: block;
    padding: var(--space-2) var(--space-3);
    font-size: var(--text-base);
    border-radius: var(--radius-sm);
  }
  .site-nav-links a:hover,
  .site-nav-links a:focus-visible {
    background: rgba(29, 98, 252, 0.06);
  }
  /* No-JS fallback: burger can't toggle, so show the links inline instead. */
  html:not(.js) .nav-toggle { display: none; }
  html:not(.js) .site-nav-links {
    position: static;
    flex-direction: row;
    flex-wrap: wrap;
    visibility: visible;
    opacity: 1;
    transform: none;
    background: none;
    border: none;
    box-shadow: none;
    padding: 0;
    min-width: 0;
    gap: var(--space-3);
  }
  html:not(.js) .site-nav-links a { padding: 0; font-size: var(--text-sm); }
}

/* ===== Utility ===== */
.skip-link {
  position: absolute;
  left: var(--space-3);
  top: var(--space-3);
  transform: translateY(calc(-100% - var(--space-3)));
  z-index: 100;
  background: var(--color-blue);
  color: var(--color-white);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  font-weight: 500;
  transition: transform var(--duration-base) var(--ease-out);
}
.skip-link:focus {
  transform: translateY(0);
  color: var(--color-white);
}

/* ===== Scroll-triggered reveal ===== */
/* Only apply when JS is active so non-JS visitors don't see blank content. */
.js .reveal {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity var(--duration-slow) var(--ease-out-soft),
              transform var(--duration-slow) var(--ease-out-soft);
  will-change: opacity, transform;
}
.js .reveal.is-visible {
  opacity: 1;
  transform: none;
}
/* Subtle stagger for the benefit cards. */
.js .benefit-grid .reveal:nth-child(2) { transition-delay: 80ms; }
.js .benefit-grid .reveal:nth-child(3) { transition-delay: 160ms; }
/* Keep the card hover lift working once revealed. */
.js .benefit-card.reveal.is-visible:hover { transform: translateY(-2px); }

/* ===== Reduced motion ===== */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
  .js .reveal { opacity: 1; transform: none; }
}