:root {
  --green: #006A4E;
  --green-ink: #00563f;
  --red: #F42A41;
  --bg: #F6F4EF;
  --card: #FFFFFF;
  --ink: #16211C;
  --muted: #5D6B64;
  --line: #E4E0D6;
  --soft: #E7F1EC;
  --shadow: 0 1px 2px rgba(22, 33, 28, .06), 0 8px 30px rgba(22, 33, 28, .06);
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0F1714;
    --card: #16211C;
    --ink: #EEF3F0;
    --muted: #9FB0A8;
    --line: #26332D;
    --soft: #13302A;
    --green-ink: #4CC49A;
    --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 8px 30px rgba(0, 0, 0, .25);
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Hind Siliguri", system-ui, -apple-system, sans-serif;
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--green-ink); }
img { display: block; }

.nav {
  position: sticky; top: 0; z-index: 10;
  display: flex; align-items: center; gap: 24px;
  max-width: 1120px; margin: 0 auto; padding: 14px 20px;
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  backdrop-filter: blur(10px);
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 20px; color: var(--ink); text-decoration: none; }
.links { display: flex; gap: 22px; margin-left: auto; }
.links a { color: var(--muted); text-decoration: none; font-weight: 500; }
.links a:hover { color: var(--ink); }
.nav-actions { display: flex; gap: 10px; align-items: center; }
.lang {
  font: inherit; font-weight: 600; font-size: 15px; cursor: pointer;
  background: transparent; color: var(--ink); border: 1px solid var(--line);
  border-radius: 999px; padding: 6px 14px;
}

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  background: var(--green); color: #fff; text-decoration: none; font-weight: 600;
  padding: 13px 22px; border-radius: 999px; border: 1.5px solid var(--green);
  transition: transform .15s ease, background .15s ease;
}
.btn:hover { transform: translateY(-1px); background: var(--green-ink); border-color: var(--green-ink); color: #fff; }
.btn-ghost { background: transparent; color: var(--green-ink); }
.btn-ghost:hover { background: var(--soft); color: var(--green-ink); }
.btn-small { padding: 7px 16px; font-size: 15px; }

.hero {
  display: grid; grid-template-columns: 1.05fr 1fr; gap: 56px; align-items: center;
  max-width: 1120px; margin: 0 auto; padding: 72px 20px 88px;
}
.pill {
  display: inline-flex; align-items: center; gap: 8px; font-size: 14px; font-weight: 600;
  color: var(--green-ink); background: var(--soft); padding: 5px 12px; border-radius: 999px;
}
.pill i { width: 8px; height: 8px; border-radius: 50%; background: var(--red); animation: pulse 1.6s infinite; }
h1 { font-size: clamp(44px, 6.4vw, 76px); line-height: 1.02; letter-spacing: -2px; margin: 18px 0 18px; }
h2 { font-size: clamp(30px, 4vw, 42px); letter-spacing: -1px; line-height: 1.1; margin: 0 0 32px; text-align: center; }
h3 { font-size: 21px; margin: 0 0 6px; }
.lead { font-size: 20px; color: var(--muted); max-width: 34em; margin: 0; }
.cta { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }
.center { text-align: center; margin-left: auto; margin-right: auto; }
.muted { color: var(--muted); }

.demo { display: flex; flex-direction: column; gap: 14px; }
.demo-tabs { display: flex; gap: 6px; background: var(--card); border: 1px solid var(--line); padding: 5px; border-radius: 999px; align-self: flex-start; }
.demo-tabs button {
  font: inherit; font-weight: 600; font-size: 15px; border: 0; cursor: pointer;
  background: transparent; color: var(--muted); padding: 6px 16px; border-radius: 999px;
}
.demo-tabs button.on { background: var(--green); color: #fff; }
.window { background: var(--card); border: 1px solid var(--line); border-radius: 18px; box-shadow: var(--shadow); overflow: hidden; }
.window-bar { display: flex; align-items: center; gap: 7px; padding: 12px 16px; border-bottom: 1px solid var(--line); }
.window-bar span { width: 11px; height: 11px; border-radius: 50%; background: var(--line); }
.window-bar em { font-style: normal; font-size: 14px; color: var(--muted); margin-left: 8px; }
.window-body { min-height: 150px; padding: 22px; }
.typed { margin: 0; font-size: 24px; line-height: 1.5; font-weight: 500; }
.cursor { display: inline-block; width: 2px; height: 1.1em; background: var(--green); vertical-align: -3px; margin-left: 2px; animation: blink 1s steps(1) infinite; }
.hold {
  font: inherit; font-weight: 700; font-size: 18px; cursor: pointer; user-select: none; -webkit-user-select: none; touch-action: none;
  display: flex; align-items: center; justify-content: center; gap: 12px;
  background: var(--card); color: var(--ink); border: 1.5px solid var(--line); border-radius: 16px; padding: 18px;
  transition: border-color .15s ease, background .15s ease;
}
.hold:hover { border-color: var(--green); }
.hold.active { background: var(--green); border-color: var(--green); color: #fff; }
.mic { width: 14px; height: 14px; border-radius: 50%; background: var(--red); box-shadow: 0 0 0 0 rgba(244, 42, 65, .5); }
.hold.active .mic { animation: ring 1s infinite; background: #fff; }
.demo-note { margin: 0; font-size: 14px; color: var(--muted); }

.section { max-width: 1120px; margin: 0 auto; padding: 72px 20px; }
.steps, .modes, .features { display: grid; gap: 18px; grid-template-columns: repeat(3, 1fr); }
.features { grid-template-columns: repeat(2, 1fr); }
.steps article, .modes article, .features article {
  background: var(--card); border: 1px solid var(--line); border-radius: 20px; padding: 28px;
}
.steps p, .modes p, .features p { margin: 0; color: var(--muted); }
.steps b {
  display: grid; place-items: center; width: 40px; height: 40px; border-radius: 12px;
  background: var(--soft); color: var(--green-ink); font-size: 20px; margin-bottom: 16px;
}
.modes .say { font-size: 15px; margin-bottom: 6px; }
.modes .out { font-size: 22px; font-weight: 600; color: var(--ink); margin: 0 0 14px; padding: 12px 16px; background: var(--bg); border-radius: 12px; }
.modes .accent { border-color: var(--green); }

.platforms { display: grid; grid-template-columns: repeat(5, 1fr); gap: 12px; }
.platforms div { background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 18px; display: flex; flex-direction: column; gap: 6px; }
.platforms span { font-weight: 700; font-size: 18px; }
.platforms em { font-style: normal; font-size: 14px; color: var(--muted); }
.platforms em.wip { color: var(--green-ink); font-weight: 600; }

.band { background: var(--green); color: #fff; border-radius: 28px; max-width: 1080px; padding: 64px 28px; margin: 48px auto; }
.band h2 { color: #fff; margin-bottom: 12px; }
.band .lead { color: rgba(255, 255, 255, .85); margin-bottom: 32px; }
.help { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.help a {
  display: flex; flex-direction: column; gap: 10px; text-decoration: none; color: #fff; font-weight: 600;
  background: rgba(255, 255, 255, .1); border: 1px solid rgba(255, 255, 255, .18); border-radius: 18px; padding: 22px;
  transition: background .15s ease;
}
.help a:hover { background: rgba(255, 255, 255, .18); }
.help b { font-size: 28px; }

.faq { max-width: 760px; }
.faq details { background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 18px 22px; margin-bottom: 10px; }
.faq summary { cursor: pointer; font-weight: 600; font-size: 18px; }
.faq details p { margin: 12px 0 0; color: var(--muted); }

.footer { max-width: 1120px; margin: 0 auto; padding: 40px 20px 56px; display: flex; flex-wrap: wrap; align-items: center; gap: 8px 24px; color: var(--muted); font-size: 15px; border-top: 1px solid var(--line); }
.footer p { margin: 0; }
.footer .brand { font-size: 17px; }

body.bn h1 { letter-spacing: -1px; line-height: 1.15; }

@keyframes blink { 50% { opacity: 0; } }
@keyframes pulse { 50% { opacity: .35; } }
@keyframes ring { 0% { box-shadow: 0 0 0 0 rgba(255, 255, 255, .6); } 100% { box-shadow: 0 0 0 12px rgba(255, 255, 255, 0); } }
@media (prefers-reduced-motion: reduce) { * { animation: none !important; transition: none !important; } }

@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; padding-top: 40px; gap: 40px; }
  .links { display: none; }
  .nav-actions { margin-left: auto; }
  .steps, .modes { grid-template-columns: 1fr; }
  .platforms { grid-template-columns: repeat(2, 1fr); }
  .help { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 560px) {
  body { font-size: 16px; }
  .nav { padding: 12px 16px; gap: 12px; }
  .hero, .section { padding-left: 16px; padding-right: 16px; }
  .features, .help { grid-template-columns: 1fr; }
  .band { border-radius: 0; margin: 32px 0; }
  .typed { font-size: 20px; }
}