:root {
  --bg: #05060a;
  --neon: #00f0ff;
  --neon2: #ff2ec4;
  --gold: #ffcf3a;
  --green: #39ff88;
  --red: #ff3b5c;
  --dim: #5a6a8a;
  --font: "Courier New", ui-monospace, monospace;
}

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

body {
  background: var(--bg);
  color: #cfe7ff;
  font-family: var(--font);
  -webkit-font-smoothing: none;
  min-height: 100vh;
}

#crt { position: relative; min-height: 100vh; }
#crt::after {
  content: ""; position: fixed; inset: 0; pointer-events: none; z-index: 100;
  background: repeating-linear-gradient(to bottom,
    rgba(0,0,0,0) 0px, rgba(0,0,0,0) 2px, rgba(0,0,0,0.16) 3px, rgba(0,0,0,0.16) 4px);
}
#crt::before {
  content: ""; position: fixed; inset: 0; pointer-events: none; z-index: 99;
  background: radial-gradient(ellipse at center, transparent 55%, rgba(0,0,0,0.65) 100%);
}

a { color: inherit; text-decoration: none; }

.topbar {
  display: flex; justify-content: space-between; align-items: center;
  padding: calc(16px + env(safe-area-inset-top, 0px)) calc(24px + env(safe-area-inset-right, 0px)) 16px calc(24px + env(safe-area-inset-left, 0px));
  border-bottom: 1px solid rgba(0,240,255,0.15);
}
.wordmark { font-weight: 900; letter-spacing: 3px; color: var(--neon); text-shadow: 0 0 8px var(--neon); }
.wordmark span { color: var(--neon2); text-shadow: 0 0 8px var(--neon2); }
.topbar nav { display: flex; gap: 10px; }
.topbar nav a {
  border: 1px solid var(--green); color: var(--green); padding: 6px 16px;
  letter-spacing: 2px; text-shadow: 0 0 6px var(--green); transition: all .12s; font-size: 13px;
}
.topbar nav a:hover { background: var(--green); color: #001016; }

.tuner-page {
  max-width: 560px; margin: 0 auto; padding: 40px 20px;
  display: flex; flex-direction: column; align-items: center; gap: 18px; text-align: center;
}
.logo {
  font-size: clamp(40px, 9vw, 72px); font-weight: 900; letter-spacing: 5px;
  color: var(--neon); text-shadow: 0 0 10px var(--neon), 0 0 28px var(--neon);
}
.sub { color: var(--gold); letter-spacing: 3px; text-transform: uppercase; font-size: 12px; }

.display {
  width: 100%; border: 1px solid rgba(0,240,255,0.3); background: rgba(0,240,255,0.03);
  padding: 28px 22px; display: flex; flex-direction: column; align-items: center; gap: 16px;
  box-shadow: 0 0 40px rgba(0,240,255,0.08);
}

.note {
  font-size: clamp(72px, 22vw, 130px); font-weight: 900; line-height: 0.9;
  color: var(--dim); text-shadow: 0 0 16px currentColor; transition: color .1s;
  min-height: 100px;
}

/* cents meter */
.meter { position: relative; width: 100%; max-width: 420px; height: 56px; }
.scale {
  position: absolute; top: 22px; left: 0; right: 0; height: 10px;
  background:
    repeating-linear-gradient(to right, rgba(0,240,255,0.18) 0 1px, transparent 1px 10%);
  border: 1px solid rgba(0,240,255,0.25);
}
.center-line {
  position: absolute; top: 14px; left: 50%; width: 2px; height: 26px;
  background: var(--green); box-shadow: 0 0 8px var(--green); transform: translateX(-1px);
}
.needle {
  position: absolute; top: 8px; left: 50%; width: 5px; height: 38px;
  background: var(--gold); box-shadow: 0 0 12px var(--gold);
  transform: translateX(-2.5px); transition: left .06s linear, background .1s;
}
.meter-labels {
  position: absolute; bottom: -4px; left: 0; right: 0; display: flex;
  justify-content: space-between; color: var(--dim); font-size: 11px; letter-spacing: 1px;
}

.cents { font-size: 18px; letter-spacing: 2px; color: var(--dim); min-height: 24px; }
.cents.good { color: var(--green); text-shadow: 0 0 8px var(--green); }
.cents.off { color: var(--gold); }
.hz { font-size: 13px; color: var(--dim); letter-spacing: 1px; }
.written { font-size: 14px; color: var(--neon2); text-shadow: 0 0 8px var(--neon2); letter-spacing: 1px; }
.written.hidden { display: none; }

.btn {
  font-family: var(--font); background: transparent; border: 2px solid var(--neon);
  color: var(--neon); padding: 12px 24px; letter-spacing: 3px; cursor: pointer;
  text-shadow: 0 0 6px var(--neon); transition: all .12s;
}
.btn:hover { background: var(--neon); color: #001016; }

.inst-row { display: flex; align-items: center; gap: 10px; color: var(--dim); font-size: 13px; letter-spacing: 1px; }
.select {
  font-family: var(--font); background: #10141f; color: var(--neon);
  border: 1px solid var(--neon); padding: 8px 10px; letter-spacing: 1px; cursor: pointer;
}
.select:focus { outline: none; box-shadow: 0 0 10px rgba(0,240,255,0.4); }

.hint { color: var(--dim); font-size: 12px; max-width: 420px; line-height: 1.5; }
.hint .g, .g { color: var(--green); }