:root {
  --bg: #0f1115;
  --panel: #171a21;
  --panel-2: #1e222b;
  --line: #2a2f3a;
  --text: #e8eaf0;
  --muted: #9aa3b2;
  --accent: #4ade80;
  --accent-ink: #052e16;
  --radius: 10px;
  --max: 1080px;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

/* Bengali needs an explicit font stack or Windows/Android fall back badly. */
textarea, .bangla, .prose {
  font-family: "Noto Sans Bengali", "Vrinda", "SutonnyMJ", "Kalpurush", "Bangla MN",
    "Nirmala UI", "Segoe UI", system-ui, sans-serif;
}

a { color: var(--accent); }
a:hover { color: #86efac; }

.site {
  max-width: var(--max);
  margin: 0 auto;
  padding: 20px 20px 8px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px 20px;
  align-items: baseline;
  border-bottom: 1px solid var(--line);
}

.brand {
  font-weight: 650;
  letter-spacing: -0.01em;
  text-decoration: none;
  color: var(--text);
}

.site nav {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 14px;
  font-size: 14px;
}

.site nav a {
  color: var(--muted);
  text-decoration: none;
  white-space: nowrap;
}
.site nav a:hover { color: var(--accent); }

main { max-width: var(--max); margin: 0 auto; padding: 28px 20px 40px; }

h1 {
  font-size: clamp(26px, 4.4vw, 36px);
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin: 0 0 12px;
}

.lede {
  color: var(--muted);
  font-size: 17px;
  max-width: 62ch;
  margin: 0 0 26px;
}

/* ---- converter ---- */

.conv {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px;
  display: grid;
  gap: 12px;
  grid-template-columns: 1fr;
}

@media (min-width: 860px) {
  .conv { grid-template-columns: 1fr 1fr; }
  .bar {
    grid-column: 1 / -1;
    display: flex;
    gap: 8px;
    justify-content: center;
    order: 3;
  }
}

.pane { display: flex; flex-direction: column; gap: 7px; min-width: 0; }

.pane label {
  font-size: 13px;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

textarea {
  width: 100%;
  background: var(--panel-2);
  color: var(--text);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px 13px;
  font-size: 17px;
  line-height: 1.9;
  resize: vertical;
  min-height: 150px;
}

textarea:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
  border-color: transparent;
}

textarea[readonly] { background: #14171d; }

.bar { display: flex; gap: 8px; flex-wrap: wrap; }

button {
  font: inherit;
  font-size: 14px;
  color: var(--text);
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 9px 16px;
  cursor: pointer;
}
button:hover { border-color: #3d4453; }
button:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

button.primary {
  background: var(--accent);
  color: var(--accent-ink);
  border-color: var(--accent);
  font-weight: 600;
}
button.primary:hover { background: #86efac; }

.copy { align-self: flex-start; margin-top: 2px; }
.copy.ok { border-color: var(--accent); color: var(--accent); }

.hint { font-size: 13px; color: #fbbf24; min-height: 1em; }

.try {
  margin: 18px 0 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  padding: 12px 16px;
}
.try summary { cursor: pointer; color: var(--muted); }
.try p { color: var(--muted); margin: 10px 0 0; }

/* ---- hub grid ---- */

.grid {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(auto-fill, minmax(258px, 1fr));
  margin: 0 0 34px;
}

.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px;
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
  transition: border-color 0.15s, transform 0.15s;
}
.card:hover { border-color: var(--accent); transform: translateY(-2px); color: inherit; }

.card h2 { font-size: 17px; margin: 0 0 6px; }
.card p { color: var(--muted); font-size: 14px; margin: 0 0 12px; flex: 1; }
.go { color: var(--accent); font-size: 14px; font-weight: 600; }

/* ---- prose ---- */

.prose { margin-top: 34px; max-width: 74ch; }
.prose h2 { font-size: 20px; margin: 30px 0 10px; letter-spacing: -0.01em; }
.prose h3 { font-size: 17px; margin: 24px 0 8px; }
.prose p, .prose li { color: #c7cdd8; }
.prose ul, .prose ol { padding-left: 22px; }
.prose li { margin: 5px 0; }
.prose table { border-collapse: collapse; width: 100%; margin: 14px 0; font-size: 15px; }
.prose th, .prose td { border: 1px solid var(--line); padding: 8px 10px; text-align: left; vertical-align: top; }
.prose th { background: var(--panel); color: var(--muted); font-weight: 600; }
.prose code {
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 1px 5px;
  font-size: 0.9em;
}

footer {
  max-width: var(--max);
  margin: 0 auto;
  padding: 20px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 13px;
}
footer p { margin: 4px 0; }

footer .usage {
  color: var(--accent);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

footer .usage[hidden] { display: none; }