/* ===========================
   CSO Tech — Global Stylesheet
   =========================== */

@import url('https://fonts.googleapis.com/css2?family=Barlow+Condensed:wght@400;600;700;900&family=Barlow:wght@300;400;500;600&display=swap');

:root {
  --green:        #3db54a;
  --green-dark:   #2a8a34;
  --green-light:  #5dd46a;
  --green-dim:    rgba(61,181,74,0.12);
  --black:        #0d0f0e;
  --dark:         #141a15;
  --card:         #1a231b;
  --border:       rgba(61,181,74,0.20);
  --text:         #e8f0e9;
  --muted:        #8aa98c;
  --white:        #ffffff;
  --radius:       6px;
  --nav-h:        70px;
  --transition:   0.25s ease;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: 'Barlow', sans-serif;
  background: var(--black);
  color: var(--text);
  font-size: 16px;
  line-height: 1.65;
  min-height: 100vh;
}

/* ---- Skip link (accessibility) ---- */
.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  background: var(--green);
  color: var(--black);
  padding: 0.5rem 1rem;
  border-radius: var(--radius);
  font-weight: 700;
  z-index: 9999;
  transition: top var(--transition);
}
.skip-link:focus { top: 1rem; }

/* ---- Navigation ---- */
nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(13,15,14,0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  height: var(--nav-h);
  display: flex;
  align-items: center;
}

.nav-inner {
  width: 100%;
  max-width: 1160px;
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo img {
  height: 44px;
  width: auto;
  display: block;
  /* Invert black logo to green-tinted white for dark bg */
  filter: invert(1) sepia(1) saturate(3) hue-rotate(85deg) brightness(0.9);
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: 0.25rem;
}

.nav-menu a {
  display: block;
  padding: 0.45rem 1rem;
  font-family: 'Barlow Condensed', sans-serif;
  font-weight: 600;
  font-size: 1rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--muted);
  text-decoration: none;
  border-radius: var(--radius);
  transition: color var(--transition), background var(--transition);
}

.nav-menu a:hover,
.nav-menu a[aria-current="page"] {
  color: var(--green);
  background: var(--green-dim);
}

/* Hamburger */
.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.4rem 0.6rem;
  cursor: pointer;
  color: var(--text);
  font-size: 1.3rem;
  line-height: 1;
}

@media (max-width: 680px) {
  .nav-toggle { display: block; }
  .nav-menu {
    display: none;
    flex-direction: column;
    position: absolute;
    top: var(--nav-h);
    left: 0; right: 0;
    background: var(--dark);
    border-bottom: 1px solid var(--border);
    padding: 1rem 1.5rem 1.5rem;
    gap: 0.1rem;
  }
  .nav-menu.open { display: flex; }
  .nav-menu a { font-size: 1.15rem; padding: 0.6rem 0.75rem; }
}

/* ---- Page wrapper ---- */
.page { max-width: 1160px; margin: 0 auto; padding: 0 1.5rem; }

/* ---- Section spacing ---- */
.section { padding: 5rem 0; }
.section-sm { padding: 3rem 0; }

/* ---- Headings ---- */
h1,h2,h3,h4 {
  font-family: 'Barlow Condensed', sans-serif;
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -0.01em;
}

/* ---- Green accent line ---- */
.accent-line {
  display: block;
  width: 48px;
  height: 4px;
  background: var(--green);
  border-radius: 2px;
  margin-bottom: 1rem;
}

/* ---- Section label ---- */
.section-label {
  font-family: 'Barlow Condensed', sans-serif;
  font-weight: 700;
  font-size: 0.8rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--green);
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 0.6rem;
}
.section-label::before {
  content: '';
  display: inline-block;
  width: 20px;
  height: 2px;
  background: var(--green);
  flex-shrink: 0;
}

/* ---- Buttons ---- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.75rem;
  border-radius: var(--radius);
  font-family: 'Barlow Condensed', sans-serif;
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  text-decoration: none;
  cursor: pointer;
  border: 2px solid transparent;
  transition: all var(--transition);
}

.btn-primary {
  background: var(--green);
  color: var(--black);
  border-color: var(--green);
}
.btn-primary:hover {
  background: var(--green-light);
  border-color: var(--green-light);
}

.btn-outline {
  background: transparent;
  color: var(--green);
  border-color: var(--green);
}
.btn-outline:hover {
  background: var(--green-dim);
}

/* ---- Cards ---- */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
  transition: border-color var(--transition), transform var(--transition);
}
.card:hover {
  border-color: var(--green);
  transform: translateY(-2px);
}

/* ---- Grid helpers ---- */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem; }
.grid-3 { display: grid; grid-template-columns: repeat(3,1fr); gap: 1.5rem; }

@media (max-width: 900px) { .grid-3 { grid-template-columns: 1fr 1fr; } }
@media (max-width: 600px) {
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
}

/* ---- Service icon ---- */
.service-icon {
  width: 48px;
  height: 48px;
  border-radius: 10px;
  background: var(--green-dim);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1rem;
  font-size: 1.4rem;
}

/* ---- Footer ---- */
footer {
  background: var(--dark);
  border-top: 1px solid var(--border);
  padding: 2.5rem 0;
  text-align: center;
  color: var(--muted);
  font-size: 0.9rem;
}
footer a { color: var(--green); text-decoration: none; }
footer a:hover { text-decoration: underline; }
.footer-inner {
  max-width: 1160px;
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}
.footer-logo img {
  height: 36px;
  filter: invert(1) sepia(1) saturate(3) hue-rotate(85deg) brightness(0.9);
  opacity: 0.7;
}

/* ---- Focus styles (a11y) ---- */
:focus-visible {
  outline: 3px solid var(--green);
  outline-offset: 3px;
  border-radius: 3px;
}

/* ---- Divider ---- */
.divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: 0;
}

/* ---- Visually hidden (screen readers) ---- */
.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}