:root {
  --bg: #0b0f1a;
  --bg2: #10162a;
  --card: rgba(255, 255, 255, 0.04);
  --card-border: rgba(255, 255, 255, 0.09);
  --text: #e6e9f2;
  --muted: #8b93a7;
  --accent: #7c3aed;
  --accent2: #22d3ee;
  --danger: #f43f5e;
  --ok: #34d399;
  --radius: 14px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Noto Sans", "Noto Sans Bengali", sans-serif;
  background:
    radial-gradient(1200px 500px at 15% -10%, rgba(124, 58, 237, 0.22), transparent 60%),
    radial-gradient(1000px 450px at 90% 0%, rgba(34, 211, 238, 0.12), transparent 55%),
    var(--bg);
  color: var(--text);
  line-height: 1.55;
  min-height: 100vh;
}

a { color: var(--accent2); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ── topbar ─────────────────────────────── */
.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 28px;
  background: rgba(11, 15, 26, 0.82);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--card-border);
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 20px; }
.brand em { font-style: normal; color: var(--accent2); }
.logo { width: 34px; height: 34px; }
.topnav { display: flex; gap: 18px; font-size: 15px; }
.topnav a { color: var(--muted); }
.topnav a:hover { color: var(--text); }

/* ── layout ─────────────────────────────── */
main { max-width: 980px; margin: 0 auto; padding: 0 20px 60px; }

.card {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 26px;
  margin: 26px 0;
  scroll-margin-top: 80px;
}

h1 { font-size: clamp(30px, 5vw, 48px); line-height: 1.15; margin: 12px 0 10px; }
h2 { font-size: 26px; margin: 0 0 16px; }
h3 { margin: 0 0 10px; font-size: 17px; }
.grad {
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero { text-align: center; padding: 64px 0 30px; }
.hero-sub { max-width: 640px; margin: 12px auto 26px; color: var(--muted); font-size: 17px; }
.hero-stats { display: flex; justify-content: center; gap: 34px; margin: 28px 0; flex-wrap: wrap; }
.stat b { display: block; font-size: 30px; background: linear-gradient(90deg, var(--accent), var(--accent2)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.stat span { color: var(--muted); font-size: 13px; text-transform: uppercase; letter-spacing: 0.08em; }
.cta {
  display: inline-block;
  padding: 13px 26px;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  color: #fff;
  font-weight: 700;
  font-size: 16px;
}
.cta:hover { filter: brightness(1.1); text-decoration: none; }

/* ── studio ─────────────────────────────── */
.studio-grid { display: grid; grid-template-columns: 1.4fr 1fr; gap: 20px; }
@media (max-width: 820px) { .studio-grid { grid-template-columns: 1fr; } }

.field { display: flex; flex-direction: column; gap: 6px; margin-bottom: 14px; }
.field span { font-size: 13px; color: var(--muted); }
.field output { color: var(--accent2); font-weight: 600; }

textarea, input[type="search"], select {
  width: 100%;
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid var(--card-border);
  background: rgba(0, 0, 0, 0.25);
  color: var(--text);
  font: inherit;
  font-size: 15px;
}
textarea:focus, input:focus, select:focus { outline: 2px solid var(--accent); border-color: transparent; }

input[type="range"] { width: 100%; accent-color: var(--accent); }

.row { display: flex; gap: 14px; align-items: flex-end; }
.grow { flex: 1; }

.btn-row { display: flex; gap: 10px; flex-wrap: wrap; margin: 6px 0 10px; }
.btn {
  padding: 11px 20px;
  border: 1px solid var(--card-border);
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.06);
  color: var(--text);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.06s ease, filter 0.15s ease;
}
.btn:hover:not(:disabled) { filter: brightness(1.15); }
.btn:active:not(:disabled) { transform: scale(0.97); }
.btn:disabled { opacity: 0.4; cursor: not-allowed; }
.btn.primary { background: linear-gradient(90deg, var(--accent), #6d28d9); border: none; }
.btn.accent { background: linear-gradient(90deg, #0e7490, var(--accent2)); border: none; }
.btn.danger { background: var(--danger); border: none; }

.note { font-size: 13px; color: var(--muted); min-height: 20px; }
.note.ok { color: var(--ok); }
.note.err { color: var(--danger); }

.fineprint { font-size: 12px; color: var(--muted); text-align: center; margin: 18px 0 0; }

.samples { background: rgba(0, 0, 0, 0.18); }
.samples ul { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 8px; }
.samples button {
  width: 100%;
  text-align: left;
  padding: 9px 12px;
  border-radius: 9px;
  border: 1px solid var(--card-border);
  background: rgba(255, 255, 255, 0.04);
  color: var(--text);
  font: inherit;
  font-size: 14px;
  cursor: pointer;
}
.samples button:hover { border-color: var(--accent); background: rgba(124, 58, 237, 0.12); }

/* ── voice catalog ──────────────────────── */
.voice-list { list-style: none; margin: 18px 0 0; padding: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 10px; }
.voice-list li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 10px 12px;
  border: 1px solid var(--card-border);
  border-radius: 10px;
  background: rgba(0, 0, 0, 0.18);
  font-size: 14px;
}
.voice-list .vl { min-width: 0; }
.voice-list .vname { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.voice-list .vlang { color: var(--muted); font-size: 12px; }
.voice-list button {
  border: none;
  background: rgba(124, 58, 237, 0.25);
  color: #fff;
  border-radius: 8px;
  padding: 6px 10px;
  cursor: pointer;
  font-size: 13px;
  flex-shrink: 0;
}
.voice-list button:hover { background: var(--accent); }

/* ── about / footer ─────────────────────── */
.about-list { padding-left: 4px; list-style: none; display: flex; flex-direction: column; gap: 10px; }
.about-list li { font-size: 15px; }
.about-list code { background: rgba(34, 211, 238, 0.12); padding: 2px 6px; border-radius: 6px; }

footer {
  border-top: 1px solid var(--card-border);
  padding: 22px 28px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  color: var(--muted);
  font-size: 13px;
}
.foot-links a { color: var(--muted); }
.foot-links a:hover { color: var(--text); }

@media (max-width: 600px) {
  .topbar { padding: 12px 16px; flex-direction: column; align-items: flex-start; }
  .topnav { width: 100%; justify-content: space-between; }
  .row { flex-direction: column; align-items: stretch; }
}