/* ===== Brand font ===== */
@font-face {
  font-family: "Lobster";
  src: url("Lobster-Regular.ttf") format("truetype");
  font-weight: 400;
  font-style: normal;
}

/* ===== Root theme tokens ===== */
:root{
  --bg-main:#050608;
  --bg-card:rgba(20,22,30,0.96);
  --bg-card-soft:rgba(16,18,26,0.9);
  --bg-input:#151824;
  --border:#2a3040;
  --fg:#f6f7ff;
  --sub:#9aa1c5;
  --accent:#4dd0ff;
  --accent-soft:rgba(77,208,255,0.12);
  --danger:#ff6b81;
  --btn:#202538;
  --btnHover:#2b3250;
  --shadow:0 18px 40px rgba(0,0,0,0.55);
  --overlay:radial-gradient(circle at top,#151a33 0,rgba(5,6,8,0.68) 55%,rgba(3,4,6,0.82) 100%);
  --bg-bright:0.65;
  --bg-blur:0.4px;
  --font-main:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
}

/* Light theme overrides */
body.light{
  --bg-main:#f5f6fb;
  --bg-card:rgba(255,255,255,0.96);
  --bg-card-soft:rgba(255,255,255,0.94);
  --bg-input:#f3f4fd;
  --border:#d5d8ea;
  --fg:#141624;
  --sub:#667099;
  --accent:#5c6ffb;
  --accent-soft:rgba(92,111,251,0.09);
  --danger:#e5415f;
  --btn:#e3e6fb;
  --btnHover:#d6daf8;
  --shadow:0 16px 32px rgba(15,17,25,0.16);
  --overlay:radial-gradient(circle at top,#ffffff 0,#f5f6fb 50%,#eef0fa 100%);
  --bg-bright:1;
  --bg-blur:0.6px;
}

/* Reset & base */
*,*::before,*::after{box-sizing:border-box}
html,body{
  margin:0;
  padding:0;
}
body{
  min-height:100vh;
  font-family:var(--font-main);
  background:var(--bg-main);
  color:var(--fg);
}

/* Background images (dark vs light) */
/* --- Dark Mode Background --- */
body::before{
  content:"";
  position:fixed;
  inset:0;
  background:url('./double-bubble-dark.png') center/512px repeat;
  filter:brightness(var(--bg-bright)) saturate(.95) blur(var(--bg-blur));
  z-index:-2;
  will-change: transform;
  pointer-events:none;
}
/* --- Light Mode Background --- */
body.light::before{
  content: "";
  position: fixed;
  inset: 0;
  background:url('./symphony.png') center/420px repeat;
  filter: brightness(1.25) saturate(1.05) blur(0.7px);
  z-index: -2;
  will-change: transform;
}
/* Dark overlay layer */
body::after{
  content:"";
  position:fixed;
  inset:0;
  background:var(--overlay);
  z-index:-1;
  pointer-events:none;
}
/* Light overlay layer (brighter tone) */
body.light::after {
  content: "";
  position: fixed;
  inset: 0;
  background: radial-gradient(circle at top, #fdfdfd 0, rgba(255,255,255,0.75) 55%, rgba(245,245,245,0.85) 100%);
  z-index: -1;
}

/* Layout wrapper */
.wrap{
  max-width:960px;
  margin:0 auto;
  padding:20px 16px 40px;
}

/* Header */
.header-row{
  display:flex;
  align-items:flex-start;
  justify-content:space-between;
  gap:12px;
  margin-bottom:14px;
}
h1{
  margin:0;
  font-size:26px;
  letter-spacing:0.03em;
}
h1 .tag{
  display:inline-block;
  margin-top:4px;
  font-size:13px;
  font-weight:400;
  color:var(--sub);
}
/* Brand */
.brand {
  font-family: "Lobster", sans-serif; 
}

/* Cards & common containers */
.card{
  background:var(--bg-card);
  border-radius:16px;
  border:1px solid var(--border);
  box-shadow:var(--shadow);
  padding:12px 14px;
  backdrop-filter:blur(18px);
}
.row{
  display:flex;
  gap:12px;
  flex-wrap:wrap;
}
.list{
  max-height:220px;
  overflow:auto;
}

/* Buttons */
.btn{
  background:var(--btn);
  border:1px solid var(--border);
  color:var(--fg);
  border-radius:999px;
  padding:7px 14px;
  font-size:13px;
  cursor:pointer;
  display:inline-flex;
  align-items:center;
  gap:6px;
  transition:background .15s ease,border-color .15s ease,transform .05s ease;
}
.btn:hover{background:var(--btnHover)}
.btn:active{transform:scale(.97)}
.btn[disabled]{opacity:.55;cursor:not-allowed}

/* Top bars */
.bar{
  display:flex;
  align-items:center;
  gap:10px;
  flex-wrap:wrap;
}
.bar select{
  padding:6px 8px;
  border-radius:999px;
  border:1px solid var(--border);
  background:var(--bg-input);
  color:var(--fg);
  font-size:13px;
}

/* Search input */
.search{flex:1 1 200px}
.search input{
  width:100%;
  padding:8px 10px;
  border-radius:999px;
  border:1px solid var(--border);
  background:var(--bg-input);
  color:var(--fg);
  font-size:13px;
}
.search input::placeholder{color:var(--sub);opacity:.8}

/* Letter keyboards */
.grid{
  display:grid;
  grid-template-columns:repeat(13,minmax(0,1fr));
  gap:4px;
}
.k{
  border-radius:10px;
  border:1px solid var(--border);
  padding:6px 0;
  text-align:center;
  font-size:13px;
  cursor:pointer;
  user-select:none;
  background:var(--bg-card-soft);
  color:var(--sub);
  transition:background .12s ease,border-color .12s ease,color .12s ease,transform .05s ease;
}
.k.inc{
  background:var(--accent-soft);
  border-color:var(--accent);
  color:var(--accent);
}
.k.exc{
  background:rgba(229,65,95,0.07);
  border-color:var(--danger);
  color:var(--danger);
}
.k:hover{transform:translateY(-1px)}
/* When locked (during calculation) */
.grid.locked .k{
  pointer-events:none;
  opacity:0.45;
}

/* Tabs 
.tabs{
  display:flex;
  gap:6px;
  flex-wrap:wrap;
} */
.tabs{
  display:grid;
  grid-template-columns:repeat(5, 1fr);
  gap:8px
}
.tab{
  border-radius:999px;
  border:1px solid var(--border);
  background:var(--bg-card-soft);
  color:var(--sub);
  padding:5px 10px;
  font-size:11px;
  cursor:pointer;
  display:inline-flex;
  align-items:center;
  gap:4px;
  justify-content: center;
}
.tab .num{font-weight:600}
.tab.active{
  background:var(--accent-soft);
  border-color:var(--accent);
  color:var(--accent);
}
@media(max-width:340px){
  .tab .label{display:none}
}

/* Counter */
.counter{
  margin-top:10px;
  font-size:13px;
  color:var(--sub);
}
.counter span{
  font-weight:600;
  font-size:18px;
  margin-right:3px;
}

/* Word list */
#words{
  list-style:none;
  margin:0;
  padding:0;
  columns:4 110px;
  column-gap:12px;
  font-family:"SF Mono","Roboto Mono",ui-monospace,Menlo,Monaco,monospace;
  font-size:13px;
}
#words li{
  break-inside:avoid;
  padding:1px 0;
}

/* Recommender controls */
.ctl{
  display:flex;
  gap:10px;
  flex-wrap:wrap;
  align-items:center;
}
.ctl label{
  font-size:13px;
  color:var(--sub);
  display:flex;
  gap:6px;
  align-items:center;
}
.ctl input[type="checkbox"]{accent-color:var(--accent)}
.ctl select{
  padding:6px 8px;
  border-radius:999px;
  border:1px solid var(--border);
  background:var(--bg-input);
  color:var(--fg);
  font-size:13px;
}

/* Button row: thresholds + Suggest / Stop / Reset */
.button-container{
  display:flex;
  flex-wrap:wrap;
  gap:8px;
  align-items:center;
  margin-top:8px;
}
.button-container label{
  font-size:13px;
  color:var(--sub);
  display:flex;
  align-items:center;
  gap:6px;
}
.button-container input[type="number"]{
  width:86px;
  padding:6px;
  border-radius:10px;
  border:1px solid var(--border);
  background:var(--bg-input);
  color:var(--fg);
  font-size:13px;
}
.button-container .btn{
  padding-inline:14px;
  flex:0 0 auto;
}
#space-1{
  display:none;
  flex-basis:0;
}

/* Progress bar */
.progress{
  position:relative;
  height:6px;
  border-radius:999px;
  background:rgba(255,255,255,0.06);
  overflow:hidden;
}
.progress .barin{
  position:absolute;
  inset:0;
  width:0%;
  border-radius:inherit;
  background:linear-gradient(90deg,var(--accent),#7cf3ff);
  transition:width .12s linear;
}

/* Tables */
table{
  width:100%;
  border-collapse:collapse;
  font-size:13px;
}
th,td{
  padding:6px 8px;
  text-align:left;
  border-bottom:1px solid rgba(255,255,255,0.06);
}
th{
  font-size:12px;
  text-transform:uppercase;
  letter-spacing:0.05em;
  color:var(--sub);
  background:rgba(0,0,0,0.1);
}
td{color:var(--fg)}
td.mono{
  font-family:"SF Mono","Roboto Mono",ui-monospace,Menlo,Monaco,monospace;
}
th#sort-steps,
th#sort-entropy,
th#sort-cands,
th#sort-bucket{
  cursor:pointer;
}
th#sort-steps:focus,
th#sort-entropy:focus,
th#sort-cands:focus,
th#sort-bucket:focus{
  outline:2px solid var(--accent);
  outline-offset:2px;
}

/* Help section & toggles */
.help{
  margin-top:16px;
  font-size:13px;
  color:var(--sub);
}
.help ul{
  margin:6px 0 0;
  padding-left:18px;
}
.help li{margin-bottom:4px}
.toggle-header{
  display:inline-block;
  margin-top:6px;
  cursor:pointer;
  user-select:none;
}
.toggle-header::before{
  content:"▶";
  display:inline-block;
  margin-right:6px;
  font-size:10px;
  transform:translateY(-1px);
}
.toggle-header.open::before{
  content:"▼";
}
.toggle-content{
  display:none;
  margin-top:4px;
}

/* Hints */
.hint{
  font-size:12px;
  color:var(--sub);
}

/* Analyze input */
#analyzeInput{
  min-width:120px;
}

/* Responsive tweaks */
@media(max-width:900px){
  #words{columns:3 110px}
}
@media(max-width:720px){
  /* --- Mobile adjustments (smaller blur for clarity) --- */
  body::before {
    filter: brightness(calc(var(--bg-bright) + 0.1)) saturate(.95) blur(0.6px);
  }
  body.light::before {
    filter: brightness(1.3) saturate(1.1) blur(0.5px);
  }
  .wrap{padding-inline:10px}
  .header-row{flex-direction:column;align-items:flex-start}
  #words{columns:2 110px}
}
/* Mobile: thresholds first row, buttons second row */
@media(max-width:600px){
  .button-container label{
    flex:1 1 calc(50% - 6px);
  }
  #space-1{
    display:block;
    flex-basis:100%;
    height:0;
  }
  .button-container .btn{
    flex:1 1 calc(33.3% - 6px);
    justify-content:center;
  }
}