:root {
  --bg: #f4faf6;
  --bg-alt: #e9f5ee;
  --surface: #ffffff;
  --text: #14261c;
  --text-muted: #4d6b58;
  --border: #d7ead9;
  --brand: #1f9d57;
  --brand-dark: #157a42;
  --brand-light: #3dd68c;
  --accent-bg: #0f3d24;
  --radius-lg: 20px;
  --radius-md: 14px;
  --radius-sm: 10px;
  --shadow: 0 10px 30px rgba(15, 61, 36, 0.08);
  --shadow-lg: 0 20px 50px rgba(15, 61, 36, 0.14);
  --max-width: 1160px;
  font-size: 16px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: "Segoe UI", "Inter", -apple-system, BlinkMacSystemFont, Roboto, Helvetica, Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.55;
}

img { max-width: 100%; display: block; }

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--brand);
  color: #fff;
  padding: 10px 16px;
  border-radius: 0 0 8px 0;
  z-index: 999;
}
.skip-link:focus { left: 0; }

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(244, 250, 246, 0.9);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  display: flex;
  align-items: center;
  gap: 24px;
  height: 72px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text);
  font-weight: 800;
  font-size: 20px;
  margin-right: auto;
}
.brand img { border-radius: 8px; }

.main-nav {
  display: flex;
  gap: 28px;
}
.main-nav a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 14.5px;
  font-weight: 600;
  transition: color 0.15s;
}
.main-nav a:hover { color: var(--brand-dark); }

.lang-switch {
  position: relative;
  margin-left: 8px;
}
.lang-current {
  font: inherit;
  font-weight: 700;
  font-size: 13px;
  letter-spacing: 0.03em;
  color: var(--text);
  background: var(--bg-alt);
  border: 1px solid rgba(20, 38, 28, 0.12);
  border-radius: 8px;
  padding: 7px 12px;
  cursor: pointer;
}
.lang-current:hover { background: var(--surface); }
.lang-menu {
  display: none;
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  min-width: 140px;
  background: var(--surface);
  border: 1px solid rgba(20, 38, 28, 0.12);
  border-radius: 10px;
  box-shadow: 0 10px 30px rgba(15, 61, 36, 0.15);
  padding: 6px;
  list-style: none;
  margin: 0;
  z-index: 50;
}
.lang-switch.open .lang-menu { display: block; }
.lang-menu li {
  padding: 8px 10px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 14px;
  color: var(--text);
}
.lang-menu li:hover { background: var(--bg-alt); }
.lang-menu li.active { color: var(--brand-dark); font-weight: 600; }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}
.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border-radius: 999px;
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
  border: 2px solid transparent;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
  white-space: nowrap;
}
.btn-sm { padding: 9px 18px; font-size: 14px; }
.btn-lg { padding: 15px 30px; font-size: 16px; }
.btn-xl { padding: 20px 40px; font-size: 18px; }

.btn-primary {
  background: linear-gradient(180deg, var(--brand-light), var(--brand));
  color: #ffffff;
  box-shadow: 0 8px 20px rgba(31, 157, 87, 0.35);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 28px rgba(31, 157, 87, 0.42); }

.btn-ghost {
  background: transparent;
  color: var(--brand-dark);
  border-color: var(--border);
}
.btn-ghost:hover { border-color: var(--brand); background: var(--bg-alt); }

/* ---------- Hero ---------- */
.hero {
  padding: 72px 0 60px;
  background:
    radial-gradient(circle at 85% -10%, rgba(61, 214, 140, 0.25), transparent 45%),
    linear-gradient(180deg, var(--bg-alt), var(--bg));
}
.hero-inner {
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: 48px;
  align-items: center;
}
.eyebrow {
  color: var(--brand-dark);
  text-transform: uppercase;
  letter-spacing: 1.6px;
  font-size: 12.5px;
  font-weight: 800;
  margin: 0 0 14px;
}
.eyebrow.center { text-align: center; }

h1 {
  font-size: clamp(32px, 4.2vw, 48px);
  line-height: 1.14;
  margin: 0 0 20px;
  font-weight: 800;
  letter-spacing: -0.5px;
}
.accent { color: var(--brand-dark); }

.lead {
  font-size: 17px;
  color: var(--text-muted);
  margin: 0 0 28px;
  max-width: 560px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 28px;
}

.hero-trust {
  display: flex;
  gap: 22px;
  list-style: none;
  padding: 0;
  margin: 0;
  flex-wrap: wrap;
  font-size: 13.5px;
  color: var(--text-muted);
  font-weight: 600;
}

.hero-media img {
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border);
}

/* ---------- Stats ---------- */
.stats { padding: 40px 0; background: var(--surface); border-block: 1px solid var(--border); }
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  text-align: center;
}
.stat strong { display: block; font-size: 26px; color: var(--brand-dark); font-weight: 800; }
.stat span { font-size: 13px; color: var(--text-muted); }

/* ---------- Section titles ---------- */
.section-title {
  font-size: clamp(26px, 3vw, 34px);
  font-weight: 800;
  margin: 0 0 44px;
  letter-spacing: -0.4px;
}
.section-title.center { text-align: center; max-width: 680px; margin-left: auto; margin-right: auto; }

section { padding: 88px 0; }
.features { background: var(--bg); }
.how { background: var(--bg-alt); }
.screenshots { background: var(--bg); }
.usecases { background: var(--bg-alt); }
.about { background: var(--bg); }
.faq { background: var(--bg-alt); }

/* ---------- Features ---------- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.feature-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 28px;
  box-shadow: var(--shadow);
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}
.feature-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.feature-icon { font-size: 30px; margin-bottom: 14px; }
.feature-card h3 { margin: 0 0 8px; font-size: 18px; }
.feature-card p { margin: 0; color: var(--text-muted); font-size: 14.5px; }

/* ---------- How it works ---------- */
.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.step {
  background: var(--surface);
  border-radius: var(--radius-md);
  padding: 30px 26px;
  border: 1px solid var(--border);
  position: relative;
}
.step-num {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: linear-gradient(180deg, var(--brand-light), var(--brand));
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  margin-bottom: 16px;
}
.step h3 { margin: 0 0 8px; font-size: 18px; }
.step p { margin: 0; color: var(--text-muted); font-size: 14.5px; }

/* ---------- Screenshots ---------- */
.screens-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
}
.screen-card {
  margin: 0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow);
}
.screen-card img { width: 100%; }
.screen-card figcaption {
  padding: 14px 18px;
  font-size: 13.5px;
  color: var(--text-muted);
  font-weight: 600;
}

/* ---------- Use cases ---------- */
.usecases-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.usecase-card {
  background: var(--surface);
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  padding: 30px 26px;
}
.usecase-card h3 { margin: 0 0 10px; font-size: 19px; color: var(--brand-dark); }
.usecase-card p { margin: 0; color: var(--text-muted); font-size: 14.5px; }

/* ---------- Download ---------- */
.download {
  background: linear-gradient(160deg, var(--accent-bg), #144f2f);
  color: #ecfbf2;
  text-align: center;
}
.download .section-title { color: #ffffff; }
.download-inner { display: flex; flex-direction: column; align-items: center; gap: 20px; }
.download .lead { color: #bfe4cf; }
.download-meta { color: #9ecbb1; font-size: 13px; margin: 0; }
.btn-os-icon { font-size: 20px; }

/* ---------- About ---------- */
.about-inner {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 48px;
  align-items: start;
}
.about p { color: var(--text-muted); }
.about-points {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 18px;
}
.about-points li {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 16px 20px;
  font-size: 14.5px;
  color: var(--text-muted);
}
.about-points strong { color: var(--text); }

/* ---------- FAQ ---------- */
.faq-list {
  max-width: 760px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.faq-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 6px 22px;
}
.faq-item summary {
  cursor: pointer;
  font-weight: 700;
  padding: 16px 0;
  list-style: none;
  position: relative;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: "+";
  position: absolute;
  right: 0;
  top: 14px;
  font-size: 20px;
  color: var(--brand);
}
.faq-item[open] summary::after { content: "–"; }
.faq-item p { margin: 0 0 18px; color: var(--text-muted); font-size: 14.5px; }

/* ---------- Footer ---------- */
.site-footer {
  background: var(--accent-bg);
  color: #bfe4cf;
  padding: 40px 0;
}
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}
.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  color: #fff;
}
.footer-nav { display: flex; gap: 22px; flex-wrap: wrap; }
.footer-nav a { color: #bfe4cf; text-decoration: none; font-size: 13.5px; }
.footer-nav a:hover { color: #fff; }
.footer-copy { margin: 0; font-size: 12.5px; color: #7fae95; width: 100%; text-align: center; padding-top: 16px; border-top: 1px solid rgba(255,255,255,0.08); margin-top: 16px; }

/* ---------- Responsive ---------- */
@media (max-width: 980px) {
  .hero-inner { grid-template-columns: 1fr; }
  .about-inner { grid-template-columns: 1fr; }
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: 1fr; }
  .usecases-grid { grid-template-columns: 1fr; }
  .screens-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 760px) {
  .main-nav { 
    position: fixed;
    inset: 72px 0 auto 0;
    background: var(--surface);
    flex-direction: column;
    padding: 20px 24px;
    gap: 16px;
    border-bottom: 1px solid var(--border);
    transform: translateY(-120%);
    transition: transform 0.2s ease;
  }
  .main-nav.open { transform: translateY(0); }
  .nav-toggle { display: flex; }
  .header-cta { display: none; }
  .features-grid { grid-template-columns: 1fr; }
  h1 { font-size: 30px; }
  section { padding: 56px 0; }
}

@media (max-width: 480px) {
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .hero-trust { flex-direction: column; gap: 10px; }
}