:root{
  /* SignBridge palette */
  --deep-navy: #0D1B2A;
  --ocean-blue: #1B3A4B;
  --teal: #62B6CB;
  --coral: #FF6B6B;
  --light: #E8F4F8;

  --muted2: #8FA3AD;
  --success: #4ECDC4;

  --bg: var(--deep-navy);
  --panel: rgba(27,58,75,0.35);
  --panel2: rgba(27,58,75,0.50);
  --text: var(--light);
  --muted: rgba(143,163,173,0.95);
  --brand: var(--teal);
  --accent: var(--coral);
  --good: var(--success);
  --border: rgba(232,244,248,0.14);
  --shadow: 0 18px 60px rgba(0,0,0,0.45);
  --radius: 16px;
  --radius2: 12px;
}

*{ box-sizing: border-box; }
html, body{ height: 100%; }
body{
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  background: radial-gradient(1200px 800px at 20% 10%, rgba(98,182,203,0.18), transparent 55%),
              radial-gradient(900px 600px at 90% 20%, rgba(255,107,107,0.12), transparent 55%),
              var(--bg);
  color: var(--text);
}

.app{
  min-height: 100%;
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding: 18px;
  max-width: 1120px;
  margin: 0 auto;
}

.app-header{
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
}

.brand{
  display: inline-flex;
  align-items: baseline;
  gap: 10px;
}
.logo{
  font-size: 1.15rem;
  font-weight: 800;
  letter-spacing: 0.2px;
  color: var(--brand);
}
.logo span{ color: var(--text); }
.logo-tag{
  font-size: 0.85rem;
  font-weight: 800;
  padding: 4px 10px;
  border-radius: 999px;
  border: 1px solid rgba(98,182,203,0.28);
  background: rgba(98,182,203,0.12);
  color: var(--text);
}

.subtitle{
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.25rem;
}

.header-actions{
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.layout{ display: grid; grid-template-columns: 1fr; }

.panel{
  background: linear-gradient(180deg, var(--panel2), var(--panel));
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}
.panel-inner{ padding: 14px; }

button, .btn-home, input, select{
  font-family: inherit;
}

button, .btn-home{
  border: 1px solid rgba(238,243,255,0.18);
  background: rgba(255,255,255,0.08);
  color: var(--text);
  padding: 12px 14px;
  border-radius: 12px;
  font-size: 0.98rem;
  cursor: pointer;
  transition: transform .08s ease, background .15s ease, border-color .15s ease;
  user-select: none;
  touch-action: manipulation;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
}

.scan-focus{
  outline: 4px solid rgba(255,107,107,0.65);
  outline-offset: 2px;
  box-shadow: 0 0 0 6px rgba(255,107,107,0.12);
}

.howto{
  border: 1px solid rgba(238,243,255,0.12);
  border-radius: var(--radius2);
  padding: 12px;
  background: rgba(0,0,0,0.12);
  margin-bottom: 14px;
}
.howto-title{
  font-weight: 900;
  margin-bottom: 8px;
}
.howto-list{
  margin: 0;
  padding-left: 20px;
  color: var(--text);
  display: grid;
  gap: 6px;
}
.howto-note{
  margin-top: 10px;
  color: var(--muted);
  line-height: 1.2rem;
}
button:hover, .btn-home:hover{ background: rgba(255,255,255,0.12); }
button:active, .btn-home:active{ transform: translateY(1px); }
button:disabled{ opacity: 0.55; cursor: not-allowed; }
button.primary{
  background: rgba(98,182,203,0.20);
  border-color: rgba(98,182,203,0.35);
}
button.danger{
  background: rgba(255,107,107,0.12);
  border-color: rgba(255,107,107,0.35);
}
.btn-home{
  background: rgba(98,182,203,0.15);
  border-color: rgba(98,182,203,0.30);
  font-weight: 700;
}
.pill{
  border-radius: 999px;
  font-weight: 700;
  padding: 10px 14px;
}

button:focus-visible, .btn-home:focus-visible, input:focus-visible, select:focus-visible, summary:focus-visible{
  outline: 3px solid rgba(98,182,203,0.50);
  outline-offset: 2px;
}

.chip, .word-btn, .tab-btn, .history-btn{
  -webkit-tap-highlight-color: transparent;
}

.chip, .word-btn, .tab-btn, .history-btn{
  min-height: 60px;
}

.tab-btn, .word-btn, .chip, .history-btn{
  user-select: none;
}

.tab-btn:active, .word-btn:active, .chip:active, .history-btn:active, .history-speak:active{
  transform: translateY(1px);
}

.section-title{
  font-weight: 800;
  letter-spacing: 0.2px;
  margin: 0 0 10px 0;
}

.hint{
  margin-top: 8px;
  color: var(--muted);
  font-size: 0.92rem;
}

.suggestions{ margin-bottom: 14px; }

.chip-row{
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.chip{
  min-height: 60px;
  padding: 10px 14px;
  border-radius: 14px;
  background: rgba(255,255,255,0.06);
  border: 2px solid rgba(238,243,255,0.12);
  font-weight: 700;
}
.chip[aria-pressed="true"]{
  border-color: rgba(98,182,203,0.60);
  background: rgba(98,182,203,0.18);
}
.chip.suggestion{
  border-color: rgba(238,243,255,0.14);
  background: rgba(0,0,0,0.10);
}

.board{
  padding-top: 6px;
  border-top: 1px solid rgba(238,243,255,0.10);
}

.tabs{
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 14px 0 12px;
}
.tab-btn{
  min-height: 60px;
  font-weight: 800;
  border-radius: 14px;
}
.tab-btn[aria-selected="true"]{
  background: rgba(98,182,203,0.20);
  border-color: rgba(98,182,203,0.45);
}

.grid{
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}
@media (max-width: 760px){
  .grid{ grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 430px){
  .grid{ grid-template-columns: 1fr; }
}

.word-btn{
  min-height: 60px;
  padding: 14px;
  border-radius: var(--radius2);
  background: rgba(255,255,255,0.06);
  border: 2px solid rgba(238,243,255,0.12);
  font-weight: 800;
  text-align: center;
}
.word-btn[aria-pressed="true"]{
  border-color: rgba(98,182,203,0.60);
  background: rgba(98,182,203,0.18);
}

.selected{
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px solid rgba(238,243,255,0.10);
}

.actions{
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 14px;
}
.scan-controls{
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}
.scan-speed{
  display: grid;
  gap: 6px;
  margin: 0;
  color: var(--muted);
  font-size: 0.92rem;
}
.scan-speed input[type="range"]{
  width: 220px;
}
.actions .primary{
  min-height: 64px;
  font-size: 1.02rem;
  font-weight: 900;
  padding: 14px 16px;
}

.kbd{
  font-variant-numeric: tabular-nums;
  font-size: 0.88rem;
  color: var(--muted);
  padding: 6px 10px;
  border-radius: 999px;
  border: 1px solid rgba(238,243,255,0.16);
  background: rgba(0,0,0,0.12);
}

.output{
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px solid rgba(238,243,255,0.10);
}

.quote{
  padding: 14px 14px;
  border-radius: var(--radius2);
  border: 1px solid rgba(238,243,255,0.16);
  background: rgba(0,0,0,0.18);
  min-height: 64px;
  display: flex;
  align-items: center;
  font-size: 1.05rem;
  line-height: 1.35rem;
}

.output-actions{
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 12px;
}
.output-actions button{
  min-height: 60px;
  font-weight: 800;
}

.status{
  margin-top: 10px;
  color: var(--muted);
  min-height: 20px;
}

.history{
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px solid rgba(238,243,255,0.10);
}

.history-list{
  margin: 0;
  padding-left: 22px;
  display: grid;
  gap: 10px;
}
.history-item{
  display: flex;
  gap: 10px;
  align-items: center;
}
.history-btn{
  flex: 1;
  min-height: 60px;
  justify-content: flex-start;
  text-align: left;
  padding: 12px 14px;
  border-radius: 14px;
  background: rgba(255,255,255,0.06);
  border: 2px solid rgba(238,243,255,0.10);
}
.history-btn:hover{ background: rgba(255,255,255,0.10); }
.history-speak{
  min-width: 60px;
  min-height: 60px;
  border-radius: 14px;
  font-weight: 900;
}

.settings{
  margin-top: 16px;
  padding-top: 12px;
  border-top: 1px solid rgba(238,243,255,0.10);
}
summary{
  cursor: pointer;
  font-weight: 900;
  padding: 10px 6px;
  border-radius: 12px;
  outline: none;
}
.settings-body{
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin-top: 10px;
}
@media (max-width: 880px){
  .settings-body{ grid-template-columns: 1fr; }
}

.setting-group{
  border: 1px solid rgba(238,243,255,0.12);
  border-radius: var(--radius2);
  padding: 12px;
  background: rgba(0,0,0,0.12);
}
.setting-title{
  font-weight: 900;
  margin-bottom: 10px;
}
label{
  display: grid;
  gap: 6px;
  margin-bottom: 10px;
  font-size: 0.95rem;
}
label.row{
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 12px;
}
input[type="text"], input[type="password"], select{
  width: 100%;
  padding: 12px 12px;
  border-radius: 12px;
  border: 1px solid rgba(238,243,255,0.16);
  background: rgba(255,255,255,0.06);
  color: var(--text);
}
select option{ color: #111; }

input[type="range"]{ width: 220px; }

.help{
  color: var(--muted);
  font-size: 0.90rem;
  line-height: 1.15rem;
}

.noscript{
  margin: 12px auto;
  max-width: 900px;
  border-radius: 12px;
  padding: 14px;
  border: 1px solid rgba(255,107,107,0.35);
  background: rgba(255,107,107,0.10);
  color: var(--text);
}