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

:root {
  --bg: #0d1117;
  --card: #161b26;
  --card2: #1c2333;
  --text: #dbe2ef;
  --dim: #8b94a8;
  --accent: #6ea8fe;
  --accent-soft: rgba(110, 168, 254, 0.14);
  --green: #4cc38a;
  --amber: #e5b567;
  --border: #2a3245;
  --radius: 14px;
}

html { font-size: 16px; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

.wrap { max-width: 640px; margin: 0 auto; padding: 24px 16px 60px; }

/* Hero */
.hero { text-align: center; padding: 28px 0 20px; }
.badge {
  display: inline-block; font-size: 0.78rem; color: var(--accent);
  background: var(--accent-soft); border: 1px solid var(--border);
  padding: 4px 12px; border-radius: 99px; margin-bottom: 14px;
}
h1 { font-size: 1.7rem; line-height: 1.25; margin-bottom: 10px; }
.sub { color: var(--dim); font-size: 0.98rem; max-width: 34rem; margin: 0 auto; }
.warn {
  margin-top: 14px; font-size: 0.85rem; color: var(--amber);
  background: rgba(229, 181, 103, 0.08); border: 1px solid rgba(229, 181, 103, 0.25);
  border-radius: 10px; padding: 8px 12px; display: inline-block;
}

/* Cards */
.card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 22px 18px; margin-top: 20px;
}
h2 { font-size: 1.15rem; margin-bottom: 14px; display: flex; align-items: center; gap: 10px; }
.step {
  display: inline-flex; align-items: center; justify-content: center;
  width: 26px; height: 26px; border-radius: 50%; flex: 0 0 26px;
  background: var(--accent); color: #0d1117; font-size: 0.9rem; font-weight: 700;
}
.sub2 { color: var(--dim); font-size: 0.9rem; margin: -6px 0 14px; }

/* Frequency display */
.freq-display { text-align: center; margin: 6px 0 10px; font-variant-numeric: tabular-nums; }
#freqValue { font-size: 3rem; font-weight: 700; letter-spacing: -1px; }
.hz { font-size: 1.1rem; color: var(--dim); margin-left: 6px; }

/* Sliders */
input[type="range"] { width: 100%; accent-color: var(--accent); height: 28px; }
.slider-labels { display: flex; justify-content: space-between; font-size: 0.72rem; color: var(--dim); margin-top: -4px; }

/* Rows & buttons */
.row { margin-top: 14px; display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.fine { justify-content: center; }
.opts { gap: 14px; }
.opt-group { display: flex; align-items: center; gap: 6px; flex-wrap: wrap; }
.opt-label { font-size: 0.78rem; color: var(--dim); margin-right: 2px; min-width: 44px; }

.btn {
  background: var(--card2); color: var(--text); border: 1px solid var(--border);
  border-radius: 10px; padding: 9px 14px; font-size: 0.9rem; cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
  -webkit-tap-highlight-color: transparent;
}
.btn:hover { border-color: var(--accent); }
.btn:disabled { opacity: 0.45; cursor: not-allowed; }
.btn.small { padding: 8px 12px; font-size: 0.85rem; }
.btn.toggle.active { background: var(--accent-soft); border-color: var(--accent); color: var(--accent); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #0d1117; font-weight: 600; }
.btn.primary:hover { filter: brightness(1.1); }
.btn.primary.playing { background: #d06767; border-color: #d06767; }
.btn.save { border-color: var(--green); color: var(--green); }
.btn.save:hover { background: rgba(76, 195, 138, 0.1); }
.btn.big { padding: 13px 22px; font-size: 1rem; }

.main-actions { margin-top: 18px; }

.hint { font-size: 0.78rem; color: var(--dim); margin-top: 8px; text-align: center; }

.vol { display: flex; align-items: center; gap: 10px; width: 100%; font-size: 0.85rem; color: var(--dim); }
.vol input { flex: 1; }

.saved {
  margin-top: 14px; padding: 10px 14px; border-radius: 10px; font-size: 0.92rem;
  background: rgba(76, 195, 138, 0.1); border: 1px solid rgba(76, 195, 138, 0.35); color: var(--green);
}

.timer-status { font-size: 0.85rem; color: var(--dim); }

/* CTA */
.cta { text-align: center; background: linear-gradient(160deg, var(--card), #182036); }
.cta h2 { justify-content: center; }
.cta p { color: var(--dim); font-size: 0.92rem; max-width: 32rem; margin: 0 auto 16px; }
#waitlistMsg { color: var(--green); font-size: 0.9rem; margin-top: 12px; }

/* FAQ */
.faq { margin-top: 34px; }
.faq h2 { margin-bottom: 12px; }
details {
  background: var(--card); border: 1px solid var(--border);
  border-radius: 10px; padding: 12px 16px; margin-bottom: 8px;
}
summary { cursor: pointer; font-weight: 600; font-size: 0.93rem; }
details p { margin-top: 10px; color: var(--dim); font-size: 0.9rem; }

/* Footer */
footer { margin-top: 40px; color: var(--dim); font-size: 0.8rem; text-align: center; }
footer p { margin-bottom: 10px; }
.tiny { font-size: 0.72rem; opacity: 0.7; }

.hidden { display: none; }

@media (max-width: 420px) {
  h1 { font-size: 1.45rem; }
  #freqValue { font-size: 2.4rem; }
}