/* Root design system: system fonts, grey/blue, light/dark */
:root {
  --font-sans: system-ui, -apple-system, "Segoe UI", Roboto, Ubuntu, Cantarell, "Noto Sans", "Helvetica Neue", Arial, sans-serif;
  --bg: #f7f9fc;
  --bg-elev: #ffffff;
  --text: #111827;
  --muted: #6b7280;
  --accent: #1e3a8a; /* deep blue */
  --accent-2: #2563eb; /* bright blue */
  --border: #e5e7eb;
  --ring: rgba(37, 99, 235, .35);
  --shadow: 0 1px 2px rgba(0,0,0,.06), 0 2px 6px rgba(0,0,0,.04);
  --radius: 10px;
  --space-1: .6rem;
  --space-2: 1.25rem;
  --space-3: 2rem;
  --space-4: 3rem;
  color-scheme: light dark;
}

/* Auto dark based on system, unless overridden by [data-theme] */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --bg: #0b1020;
    --bg-elev: #11162a;
    --text: #e5e7eb;
    --muted: #9aa3b2;
    --accent: #6ea8ff;
    --accent-2: #93c5fd;
    --border: #1f2942;
    --shadow: none;
  }
}

/* Manual override */
html[data-theme="light"] {
  color-scheme: light;
  --bg: #f7f9fc;
  --bg-elev: #ffffff;
  --text: #111827;
  --muted: #6b7280;
  --accent: #1e3a8a;
  --accent-2: #2563eb;
  --border: #e5e7eb;
  --shadow: 0 1px 2px rgba(0,0,0,.06), 0 2px 6px rgba(0,0,0,.04);
}
html[data-theme="dark"] {
  color-scheme: dark;
  --bg: #0b1020;
  --bg-elev: #11162a;
  --text: #e5e7eb;
  --muted: #9aa3b2;
  --accent: #6ea8ff;
  --accent-2: #93c5fd;
  --border: #1f2942;
  --shadow: none;
}

/* Base */
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
}

a { color: var(--accent-2); text-decoration: none; }
a:hover { color: var(--accent); }
a:focus-visible { outline: 2px solid var(--ring); outline-offset: 2px; border-radius: 6px; }

img { max-width: 100%; height: auto; }

/* Layout helpers */
.container { max-width: 68rem; margin: 0 auto; padding: 0 var(--space-2); }
section { padding: var(--space-4) var(--space-2); }
section > .container { padding-top: .25rem; }
h1 { margin-top: 0; margin-bottom: var(--space-2); }
h2 { margin-top: 0; margin-bottom: var(--space-2); }
h3 { margin-top: 0; margin-bottom: .75rem; }
p + p { margin-top: .75rem; }
section + section { padding-top: calc(var(--space-4) + .5rem); }
h1, h2, h3 { line-height: 1.2; margin: 0 0 var(--space-2); }
p { margin: 0 0 var(--space-2); color: var(--text); }
ul, ol { margin: 0 0 var(--space-2) 1.25rem; }

/* Responsive grids */
.grid-2 { display: grid; gap: var(--space-3); grid-template-columns: 1fr; align-items: start; }
@media (min-width: 900px) {
  .grid-2 { grid-template-columns: 2fr 1fr; }
}
.card { background: var(--bg-elev); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); padding: var(--space-2); }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 100;
  display: grid; grid-template-columns: 1fr auto auto auto; gap: var(--space-2);
  align-items: center;
  padding: 1rem var(--space-2);
  background: linear-gradient(180deg, rgba(37,99,235,.08), transparent) var(--bg-elev);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow);
}
.site-branding a { font-weight: 700; color: var(--accent); }
.site-nav a { color: var(--text); padding: .25rem .5rem; border-radius: 6px; transition: background .2s ease, color .2s ease; }
.site-nav a:hover { background: rgba(37,99,235,.10); }
.site-contact a { margin-left: var(--space-2); color: var(--accent); font-weight: 600; }
/* Compact icon buttons for contact */
.icon-btn { display:inline-flex; align-items:center; justify-content:center; min-width: 2.25rem; height: 2.25rem; border: 1px solid var(--border); background: var(--bg-elev); color: var(--text); border-radius: 8px; font-weight: 700; transition: border-color .2s ease, background .2s ease, color .2s ease; }
.icon-btn:hover { border-color: var(--accent-2); color: var(--accent); }
.site-contact .icon-btn + .icon-btn { margin-left: .5rem; }

/* Theme toggle */
.theme-toggle {
  justify-self: end;
  border: 1px solid var(--border);
  background: var(--bg-elev);
  color: var(--text);
  border-radius: 999px;
  padding: .35rem .75rem;
  font: inherit;
  cursor: pointer;
  transition: border-color .2s ease, background .2s ease, color .2s ease;
}
.theme-toggle:hover { border-color: var(--accent-2); }
.theme-toggle:focus-visible { outline: 2px solid var(--ring); outline-offset: 2px; }

/* Mobile nav via <details> with transitions */
.nav-mobile { display: none; grid-column: 1 / -1; }
.nav-mobile > summary {
  list-style: none; cursor: pointer; user-select: none;
  padding: .5rem .75rem; border-radius: 8px; border: 1px solid var(--border);
  background: var(--bg-elev); color: var(--text);
  transition: border-color .2s ease, background .2s ease;
}
.nav-mobile > summary:hover { border-color: var(--accent-2); }
.nav-mobile .nav-panel {
  overflow: hidden; max-height: 0; opacity: 0;
  transition: max-height .35s ease, opacity .25s ease;
  background: var(--bg-elev); border: 1px solid var(--border); border-radius: 8px; margin-top: .5rem; padding: 0 var(--space-2);
}
.nav-mobile[open] .nav-panel { max-height: 40rem; opacity: 1; padding: var(--space-2); }
.site-nav.mobile a { display: block; padding: .5rem 0; }
.site-contact.mobile a { display: inline-block; margin: .5rem 1rem .5rem 0; }

@media (max-width: 768px) {
  .site-nav, .site-contact { display: none; }
  .nav-mobile { display: none; }
  .site-header { grid-template-columns: 1fr; }
  .theme-toggle { justify-self: start; margin-top: .5rem; }
}

/* Sections */
.hero { background: linear-gradient(180deg, rgba(37,99,235,.06), transparent); }
.hero h1 { font-size: clamp(1.6rem, 2.5vw, 2rem); }
.hero { text-align: center; }
.hero p { color: var(--muted); max-width: 52rem; margin-left: auto; margin-right: auto; }

.intro p { max-width: 52rem; }

.steps ol { padding-left: 1.25rem; }
.steps li { margin-bottom: .5rem; }

.checklist ul { padding-left: 1.25rem; }
.checklist li { margin-bottom: .35rem; }

.faq article { padding: var(--space-2); background: var(--bg-elev); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); }
.faq article + article { margin-top: var(--space-2); }
.faq h3 { margin-bottom: .25rem; }
.faq p { color: var(--text); }

.cta { text-align: center; }
.cta a { display: inline-block; margin: 0 .25rem; padding: .5rem .85rem; border-radius: 8px; background: var(--accent-2); color: #fff; transition: transform .1s ease, background .2s ease; }
.cta a:hover { background: var(--accent); }
.cta a:active { transform: translateY(1px); }

/* Footer */
.site-footer { border-top: 1px solid var(--border); background: var(--bg-elev); padding: var(--space-3) var(--space-2); }
.site-footer nav a { margin-right: var(--space-2); color: var(--text); }
.site-footer nav a:hover { color: var(--accent-2); text-decoration: underline; }
.footer-contact a { margin-right: var(--space-2); color: var(--accent); font-weight: 600; }

/* Cards rhythm */
.card + .card { margin-top: var(--space-3); }
/* Auto-frame left column sections as cards */
.grid-2 > div > section { background: var(--bg-elev); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); padding: var(--space-2); }
.grid-2 > div > section + section { margin-top: var(--space-3); }

/* Footer layout: two columns */
.site-footer .container { display: grid; grid-template-columns: 1fr auto; gap: var(--space-2); align-items: center; justify-content: center; justify-items: center; }
@media (max-width: 700px) {
  .site-footer .container { grid-template-columns: 1fr; text-align: center; }
  .site-footer nav a { display: inline-block; margin-bottom: .35rem; }
}

/* Testimonials */
.testimonials blockquote { margin: 0; padding: var(--space-2); background: var(--bg-elev); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); }
.testimonials blockquote + blockquote { margin-top: var(--space-2); }
.testimonials footer { margin-top: .5rem; color: var(--muted); font-size: .95rem; }

/* Forms */
.contact-form { max-width: 48rem; }
.field { margin-bottom: var(--space-2); }
.field label { display: block; font-weight: 600; margin-bottom: .35rem; }
.field input[type="text"],
.field input[type="email"],
.field input[type="tel"],
.field textarea {
  width: 100%; padding: .6rem .7rem; border: 1px solid var(--border); border-radius: 8px; background: var(--bg-elev); color: var(--text);
}
.field textarea { min-height: 9rem; resize: vertical; }
.field .hint { color: var(--muted); font-size: .9rem; margin-top: .25rem; }
.btn-primary { display: inline-block; padding: .6rem .9rem; border-radius: 8px; border: 1px solid var(--accent-2); background: var(--accent-2); color: #fff; font-weight: 600; cursor: pointer; }
.btn-primary:hover { background: var(--accent); border-color: var(--accent); }
.muted { color: var(--muted); }

/* Hamburger + mobile drawer */
.hamburger { display: none; align-items: center; justify-content: center; width: 2.5rem; height: 2.5rem; border: 1px solid var(--border); background: var(--bg-elev); color: var(--text); border-radius: 8px; cursor: pointer; }
.hamburger span { display: block; width: 1.3rem; height: 2px; background: currentColor; margin: 3px 0; transition: transform .2s ease, opacity .2s ease; }
@media (max-width: 768px) { .hamburger { display: inline-flex; } }

.mobile-drawer { position: fixed; inset: 0 0 0 auto; width: 100%; max-width: 100%; background: var(--bg-elev); border-left: 1px solid var(--border); transform: translateX(100%); transition: transform .3s ease; z-index: 200; padding: var(--space-3) var(--space-2); overflow-y: auto; }
body.nav-open .mobile-drawer { transform: translateX(0); }
.mobile-drawer .mobile-brand { display: block; font-weight: 700; color: var(--accent); margin-bottom: var(--space-2); }
.mobile-menu { list-style: none; margin: 0; padding: 0; }
.mobile-menu li a { display: block; padding: .6rem 0; color: var(--text); border-bottom: 1px solid var(--border); }
.mobile-actions { margin-top: var(--space-3); }
.mobile-actions .icon-btn { margin-right: .5rem; }
.mobile-close { position: absolute; top: .75rem; right: .75rem; border: 1px solid var(--border); background: var(--bg-elev); color: var(--text); border-radius: 8px; width: 2rem; height: 2rem; }