:root{
  --radius-xl: 18px;
  --radius-lg: 14px;
  --blur: 16px;

  --bg0: #f4f6ff;
  --bg1: #fef7f4;

  --text: rgba(20, 22, 30, 0.92);
  --muted: rgba(20, 22, 30, 0.60);

  --card: rgba(255,255,255,0.62);
  --card2: rgba(255,255,255,0.44);
  --border: rgba(20,22,30,0.10);

  --shadow: 0 10px 28px rgba(20,22,30,0.10);
  --shadow2: 0 16px 52px rgba(20,22,30,0.14);

  --accent: rgba(32, 112, 255, 0.95);
  --accent2: rgba(255, 79, 158, 0.85);
}

:root[data-theme="dark"]{
  --bg0: #0b0d14;
  --bg1: #12162a;

  --text: rgba(245, 246, 252, 0.92);
  --muted: rgba(245, 246, 252, 0.60);

  --card: rgba(15, 18, 30, 0.68);
  --card2: rgba(15, 18, 30, 0.48);
  --border: rgba(245,246,252,0.10);

  --shadow: 0 10px 35px rgba(0,0,0,0.35);
  --shadow2: 0 18px 60px rgba(0,0,0,0.45);

  --accent: rgba(120, 180, 255, 0.98);
  --accent2: rgba(255, 120, 200, 0.92);
}

/* Palettes */
:root[data-palette="lime"]{
  --accent: rgba(55, 220, 120, 0.95);
  --accent2: rgba(190, 255, 80, 0.90);
}
:root[data-palette="candy"]{
  --accent: rgba(255, 90, 160, 0.95);
  --accent2: rgba(120, 160, 255, 0.92);
}
:root[data-palette="steel"]{
  --accent: rgba(140, 160, 190, 0.95);
  --accent2: rgba(90, 110, 140, 0.92);
}

*{ box-sizing:border-box; }
html,body{ height:100%; }
body{
  margin:0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial;
  color: var(--text);
  background: linear-gradient(135deg, var(--bg0), var(--bg1));
  overflow-x:hidden;
}

.bg{ position:fixed; inset:0; pointer-events:none; overflow:hidden; }
.blob{
  position:absolute;
  width: 520px; height: 520px;
  border-radius: 999px;
  filter: blur(30px);
  opacity: 0.50;
  animation: drift 16s ease-in-out infinite;
}
.blob-a{
  left:-160px; top:-190px;
  background: radial-gradient(circle at 30% 30%, var(--accent), transparent 60%);
}
.blob-b{
  right:-200px; bottom:-240px;
  background: radial-gradient(circle at 60% 40%, var(--accent2), transparent 62%);
  animation-duration: 20s;
}
@keyframes drift{
  0%,100%{ transform: translate3d(0,0,0) scale(1); }
  50%{ transform: translate3d(26px,-14px,0) scale(1.04); }
}
.noise{
  position:absolute; inset:0;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='260' height='260'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.8' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='260' height='260' filter='url(%23n)' opacity='.20'/%3E%3C/svg%3E");
  mix-blend-mode: overlay;
  opacity: 0.16;
}

@media (prefers-reduced-motion: reduce){
  .blob{ animation:none; }
  .lift{ transition:none !important; }
}

.glass{
  background: linear-gradient(180deg, var(--card), var(--card2));
  border: 1px solid var(--border);
  backdrop-filter: blur(var(--blur));
  -webkit-backdrop-filter: blur(var(--blur));
  box-shadow: var(--shadow);
}

.app{
  min-height:100vh;
  padding: 12px;
  padding-bottom: 104px; /* space for fixed themebar */
  display:flex;
  flex-direction:column;
  gap: 10px;
}

.topbar{
  border-radius: var(--radius-xl);
  padding: 10px 12px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap: 10px;
}
.brand{ display:flex; align-items:center; gap: 10px; }
.logo{
  width: 28px; height: 28px;
  border-radius: 12px;
  background: radial-gradient(circle at 30% 30%, var(--accent), rgba(255,255,255,0.0) 65%),
              radial-gradient(circle at 70% 70%, var(--accent2), rgba(255,255,255,0.0) 62%);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}
.brand-name{
  font-weight: 860;
  letter-spacing: 0.16em;
  font-size: 13px;
}

.seg{
  display:flex;
  border-radius: 999px;
  padding: 3px;
  gap: 3px;
}
.seg-btn{
  border:0;
  background: transparent;
  color: var(--muted);
  padding: 7px 9px;
  border-radius: 999px;
  cursor:pointer;
  font-weight: 760;
  font-size: 12px;
  transition: transform 140ms ease, background 140ms ease, color 140ms ease;
}
.seg-btn:hover{ transform: translateY(-1px); }
.seg-btn[aria-pressed="true"]{
  background: rgba(255,255,255,0.40);
  color: var(--text);
}
:root[data-theme="dark"] .seg-btn[aria-pressed="true"]{ background: rgba(255,255,255,0.10); }

.layout{
  display:grid;
  grid-template-columns: 320px 1fr;
  gap: 10px;
  align-items: start;
}

.sidebar{
  border-radius: var(--radius-xl);
  padding: 10px;
  position: sticky;
  top: 12px;
  overflow: auto; /* no vh math */
  max-height: calc(100vh - 24px); /* safe */
}

.menu{ padding-right: 2px; }
.section{ margin-bottom: 10px; }

.section-head{
  width:100%;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap: 10px;
  border: 1px solid transparent;
  border-radius: 14px;
  padding: 9px 10px;
  cursor:pointer;
  background: transparent;
  color: var(--text);
  transition: transform 140ms ease, border-color 140ms ease, background 140ms ease;
}
.section-head:hover{
  transform: translateY(-1px);
  border-color: var(--border);
  background: rgba(255,255,255,0.22);
}
:root[data-theme="dark"] .section-head:hover{ background: rgba(255,255,255,0.06); }

.section-head[aria-expanded="true"]{
  border-color: rgba(32,112,255,0.28);
  background: rgba(32,112,255,0.10);
}
.section-title{ display:flex; align-items:center; gap: 8px; font-weight: 800; }
.chev{ color: var(--muted); }

.items{
  margin-top: 6px;
  display:flex;
  flex-direction:column;
  gap: 6px;
  padding-left: 6px;
}
.item-btn{
  width:100%;
  display:flex;
  align-items:center;
  gap: 10px;
  border: 1px solid transparent;
  border-radius: 14px;
  padding: 9px 10px;
  cursor:pointer;
  background: transparent;
  color: var(--text);
  transition: transform 140ms ease, border-color 140ms ease, background 140ms ease;
}
.item-btn:hover{
  transform: translateY(-1px);
  border-color: var(--border);
  background: rgba(255,255,255,0.22);
}
:root[data-theme="dark"] .item-btn:hover{ background: rgba(255,255,255,0.06); }
.item-btn[aria-current="true"]{
  border-color: rgba(32,112,255,0.28);
  background: rgba(32,112,255,0.10);
}

.main{ min-height: 60vh; }
.panel{
  border-radius: var(--radius-xl);
  padding: 12px;
}
.panel-head{
  display:flex;
  align-items:flex-start;
  justify-content:space-between;
  gap: 10px;
  margin-bottom: 10px;
}
.panel-title{ font-size: 18px; font-weight: 860; }
.panel-sub{ font-size: 12px; color: var(--muted); margin-top: 2px; }

.btn{
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 9px 11px;
  cursor:pointer;
  color: var(--text);
  background: transparent;
  display:flex;
  align-items:center;
  gap: 8px;
  transition: transform 140ms ease;
}
.btn:hover{ transform: translateY(-1px); }

.panel-body{ display:grid; gap: 10px; }

.card{
  border-radius: var(--radius-lg);
  padding: 12px;
}
.card-head{ margin-bottom: 8px; }
.card-title{ font-weight: 820; }
.card-desc{ font-size: 12px; color: var(--muted); margin-top: 2px; }

.grid{ display:grid; grid-template-columns: 1fr 1fr; gap: 8px; }
@media (max-width: 980px){
  .layout{ grid-template-columns: 1fr; }
  .sidebar{ position: relative; max-height: none; }
  .grid{ grid-template-columns: 1fr; }
}

.field{ display:flex; flex-direction:column; gap: 6px; }
.label{ font-size: 12px; color: var(--muted); }
.input, select{
  width:100%;
  border-radius: 14px;
  border: 1px solid var(--border);
  padding: 11px 12px;
  background: rgba(255,255,255,0.18);
  color: var(--text);
  outline:none;
  transition: box-shadow 140ms ease;
}
:root[data-theme="dark"] .input,
:root[data-theme="dark"] select{ background: rgba(255,255,255,0.06); }
.input:focus, select:focus{ box-shadow: 0 0 0 4px rgba(32,112,255,0.16); }

.row{ display:flex; gap: 8px; align-items:center; flex-wrap:wrap; }
.range{ width:100%; }

.result{
  margin-top: 8px;
  border-radius: var(--radius-lg);
  padding: 10px 12px;
  border: 1px solid var(--border);
  background: rgba(255,255,255,0.16);
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap: 10px;
}
:root[data-theme="dark"] .result{ background: rgba(255,255,255,0.05); }

.value{
  font-size: 26px;
  font-weight: 880;
  letter-spacing: -0.02em;
}
.value.sub{
  font-size: 12px;
  font-weight: 650;
  color: var(--muted);
  margin-top: 2px;
}
.value-wrap{ display:flex; flex-direction:column; }

.copy-btn, .swap{
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 9px 11px;
  cursor:pointer;
  background: transparent;
  color: var(--text);
  transition: transform 140ms ease;
}
.copy-btn:hover, .swap:hover{ transform: translateY(-1px); }

.pill{
  display:inline-flex;
  align-items:center;
  gap: 8px;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 6px 10px;
  background: rgba(255,255,255,0.14);
  color: var(--muted);
  font-size: 12px;
}

.lift{ transition: transform 180ms ease, box-shadow 180ms ease; }
.lift:hover{ transform: translateY(-2px); box-shadow: var(--shadow2); }

/* Fixed bottom slim theme bar */
.themebar{
  position: fixed;
  left: 12px;
  right: 12px;
  bottom: 12px;
  border-radius: var(--radius-xl);
  padding: 8px 10px;
  z-index: 50;
}
.themebar-row{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap: 10px;
  flex-wrap:wrap;
}
.themebar-label{
  font-size: 12px;
  color: var(--muted);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  padding-left: 6px;
}
.themebar-groups{
  display:flex;
  gap: 8px;
  flex-wrap:wrap;
  justify-content:flex-end;
}

.toast{
  position: fixed;
  left: 50%;
  bottom: 92px; /* above themebar */
  transform: translateX(-50%);
  padding: 9px 12px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: rgba(255,255,255,0.50);
  backdrop-filter: blur(var(--blur));
  -webkit-backdrop-filter: blur(var(--blur));
  color: var(--text);
  box-shadow: var(--shadow);
  opacity: 0;
  pointer-events:none;
  transition: opacity 180ms ease, transform 180ms ease;
  z-index: 60;
}
:root[data-theme="dark"] .toast{ background: rgba(15,18,30,0.70); }
.toast.show{ opacity: 1; transform: translateX(-50%) translateY(-4px); }