:root{
  --bg: #0b0d12;
  --text: rgba(255,255,255,.92);
  --muted: rgba(255,255,255,.70);
  --muted2: rgba(255,255,255,.55);
  --border: rgba(255,255,255,.12);
  --shadow: 0 10px 30px rgba(0,0,0,.35);
  --radius: 18px;
  --radius2: 12px;
  --accent: rgba(160, 220, 255, .95);
  --max: 1080px;
  --mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  --sans: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
}

*{ box-sizing: border-box; }
html, body{ height:100%; overflow-x: hidden; }

body{
  margin:0;
  font-family: var(--sans);
  color: var(--text);
  background: var(--bg);
  min-height: 100%;
}

/* Background fixed layer (no “break” on scroll) */
body::before{
  content:"";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;

  background:
    radial-gradient(900px 450px at 20% 10%, rgba(120,180,255,.20), transparent 55%),
    radial-gradient(700px 400px at 80% 20%, rgba(160,220,255,.16), transparent 55%),
    radial-gradient(800px 500px at 50% 90%, rgba(120,255,190,.10), transparent 60%),
    var(--bg);
}

/* Subtle noise layer */
body::after{
  content:"";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;

  /* CSS-only grain */
  background-image:
    radial-gradient(circle at 10% 20%, rgba(255,255,255,.06) 0 1px, transparent 1px),
    radial-gradient(circle at 80% 40%, rgba(0,0,0,.10) 0 1px, transparent 1px),
    radial-gradient(circle at 30% 80%, rgba(255,255,255,.04) 0 1px, transparent 1px),
    radial-gradient(circle at 60% 10%, rgba(0,0,0,.10) 0 1px, transparent 1px);
  background-size: 140px 140px, 180px 180px, 120px 120px, 200px 200px;
  background-position: 0 0, 40px 60px, 80px 20px, 20px 90px;

  opacity: .22;              /* adjust: 0.12 to 0.28 */
  mix-blend-mode: overlay;   /* nice on dark UI */
  filter: contrast(120%);
}

a{ color: inherit; text-decoration: none; }
a:hover{ opacity: .92; }

.container{
  width: min(var(--max), calc(100% - 32px));
  margin: 0 auto;
}

/* Header */
.site-header{
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(10px);
  background: rgba(11,13,18,.55);
  border-bottom: 1px solid var(--border);
}

.header-inner{
  height: 64px;
  display:flex;
  align-items:center;
  justify-content: space-between;
  gap: 16px;
}

.brand{
  display:flex;
  align-items:center;
  gap: 10px;
  font-weight: 800;
  letter-spacing: .2px;
}

.brand-dot{ color: var(--accent); }
.brand-dash{ color: rgba(255,255,255,.85); }
.brand-text{ opacity: .95; }

.nav{
  display:flex;
  gap: 14px;
  color: var(--muted);
  font-size: 14px;
}
.nav a{
  padding: 8px 10px;
  border-radius: 10px;
}
.nav a:hover{
  background: rgba(255,255,255,.06);
  color: var(--text);
}

/* Hero */
.hero{
  padding: 28px 0 14px;
  display:grid;
  grid-template-columns: 1.25fr .75fr;
  gap: 18px;
  align-items: stretch;
}

.hero h1{
  margin: 4px 0 8px;
  font-size: clamp(26px, 4vw, 40px);
  line-height: 1.1;
  letter-spacing: -.6px;
}

.subtitle{
  margin: 0 0 14px;
  color: var(--muted);
  max-width: 60ch;
}

.tip{ margin-top: 10px; }
.small{ font-size: 13px; }
.muted{ color: var(--muted); }
code{ font-family: var(--mono); font-size: .95em; }

.quick-examples{
  display:flex;
  flex-wrap: wrap;
  gap: 10px;
}

.chip{
  border: 1px solid var(--border);
  background: rgba(255,255,255,.04);
  color: var(--text);
  padding: 10px 12px;
  border-radius: 999px;
  cursor:pointer;
  font-size: 13px;
}
.chip:hover{ background: rgba(255,255,255,.07); }

/* Ad */
.ad-card{
  border: 1px solid var(--border);
  background: linear-gradient(180deg, rgba(255,255,255,.07), rgba(255,255,255,.04));
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 14px;
  height: 100%;
  display:flex;
  flex-direction: column;
  gap: 10px;
}
.ad-label{
  font-size: 12px;
  color: var(--muted2);
  letter-spacing: .3px;
}
.ad-placeholder{
  border: 1px dashed rgba(255,255,255,.22);
  border-radius: 14px;
  min-height: 110px;
  display:grid;
  place-items:center;
  color: rgba(255,255,255,.65);
  font-size: 13px;
  padding: 12px;
}

/* Cards */
.card{
  border: 1px solid var(--border);
  background: rgba(255,255,255,.05);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 18px;
  margin: 14px 0;
}

.card-header{
  display:flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 14px;
}

.card h2{
  margin:0;
  font-size: 20px;
  letter-spacing: -.2px;
}

/* Fields */
.field{
  display:flex;
  flex-direction: column;
  gap: 8px;
}

.field.inline{
  flex-direction: row;
  align-items:center;
  gap: 10px;
}
.field.inline label{ min-width: 58px; }

label{
  font-size: 13px;
  color: var(--muted);
}

textarea, input{
  width: 100%;
  border: 1px solid var(--border);
  background: rgba(0,0,0,.25);
  color: var(--text);
  border-radius: var(--radius2);
  padding: 12px 12px;
  font-family: var(--mono);
  font-size: 14px;
  outline: none;
}

textarea:focus, input:focus{
  border-color: rgba(120,180,255,.55);
  box-shadow: 0 0 0 4px rgba(120,180,255,.12);
}

/* Buttons */
.actions{
  display:flex;
  gap: 10px;
  flex-wrap: wrap;
}

.btn{
  border: 1px solid var(--border);
  background: rgba(255,255,255,.05);
  color: var(--text);
  padding: 10px 12px;
  border-radius: 12px;
  cursor:pointer;
  font-size: 14px;
}
.btn:hover{ background: rgba(255,255,255,.08); }
.btn:active{ transform: translateY(1px); }
.btn.primary{
  border-color: rgba(120,180,255,.35);
  background: rgba(120,180,255,.14);
}

/* Helper text */
.hint{
  color: var(--muted2);
  font-size: 13px;
  min-height: 18px;
}
.status{
  font-size: 13px;
  min-height: 18px;
  color: var(--muted2);
  margin-top: 10px;
}

/* Layout */
.grid-2{
  display:grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

/* Segmented control */
.segmented{
  display:flex;
  border: 1px solid var(--border);
  background: rgba(255,255,255,.04);
  border-radius: 12px;
  overflow:hidden;
}
.segmented-btn{
  flex:1;
  padding: 10px 12px;
  background: transparent;
  border: 0;
  color: var(--muted);
  cursor:pointer;
  font-size: 14px;
}
.segmented-btn.active{
  background: rgba(255,255,255,.10);
  color: var(--text);
}

/* Audio */
.audio-panel{
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid rgba(255,255,255,.10);
}

.audio-row{
  display:flex;
  gap: 10px;
  align-items:flex-start;
  flex-wrap: wrap;
  min-width: 0;
}

.audio-sliders{
  display:grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 10px;
  flex: 1 1 100%;
  width: 100%;
  min-width: 0;
}

.slider{
  display:flex;
  flex-direction: column;
  gap: 6px;
  border: 1px solid rgba(255,255,255,.10);
  background: rgba(255,255,255,.04);
  padding: 10px;
  border-radius: 14px;
  min-width: 0;
}

.slider input[type="range"]{
  width: 100%;
  max-width: 100%;
}

.slider-val{
  font-family: var(--mono);
  color: var(--muted);
  font-size: 13px;
}

/* Table */
.table-controls{
  display:flex;
  align-items:center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 10px;
}

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

.badge{
  font-size: 12px;
  color: var(--muted);
  border: 1px solid var(--border);
  background: rgba(255,255,255,.04);
  padding: 6px 10px;
  border-radius: 999px;
}

.table-wrap{
  overflow:auto;
  border-radius: 14px;
  border: 1px solid var(--border);
}

.morse-table{
  width: 100%;
  border-collapse: collapse;
  min-width: 520px;
}

.morse-table th, .morse-table td{
  padding: 12px 12px;
  border-bottom: 1px solid rgba(255,255,255,.08);
  text-align: left;
  font-size: 14px;
}
.morse-table th{
  color: var(--muted);
  background: rgba(255,255,255,.04);
  position: sticky;
  top: 0;
}
.morse{
  font-family: var(--mono);
  letter-spacing: .8px;
}
.type{
  color: var(--muted);
  font-size: 13px;
}

/* Footer */
.footer{
  margin: 18px 0 26px;
  text-align:center;
  color: var(--muted2);
  font-size: 13px;
}

/* Responsive */
@media (max-width: 900px){
  .hero{ grid-template-columns: 1fr; }
  .grid-2{ grid-template-columns: 1fr; }
  .nav{ display:none; }
  .audio-sliders{ grid-template-columns: 1fr; }
  .audio-row .btn{ flex: 1; } 
}