/* Base: transparent canvas */
:root{
  --bg-glass: rgba(255,255,255,0.5);
  --border-glass: rgba(255,255,255,0.6);
  --text: #0f172a; /* slate-900 */
  --muted: #334155; /* slate-700 */
  --ring: 0 0 0 3px rgba(59,130,246,0.35);
  --shadow: 0 10px 25px rgba(0,0,0,0.12);
}

@media (prefers-color-scheme: dark){
  :root{
    --bg-glass: rgba(17,25,40,0.45);
    --border-glass: rgba(255,255,255,0.12);
    --text: #e5e7eb;
    --muted: #cbd5e1;
  }
}

*{ box-sizing: border-box; }

html, body{
  height: 100%;
}

body{
  margin: 0;
  padding-left: 10%;
  padding-right: 10%;
  font: 16px/1.5 system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji","Segoe UI Emoji";
  color: var(--text);
  background: transparent; /* key: transparent background */
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

.skip-link{
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--bg-glass);
  padding: .5rem .75rem;
  border-radius: .5rem;
  border: 1px solid var(--border-glass);
}
.skip-link:focus{ left: .5rem; top: .5rem; }

.site-header{
  display: grid;
  gap: 1rem;
  align-items: end;
  padding: 1.25rem clamp(1rem, 3vw, 2rem);
}

.branding h1{
  font-size: clamp(1.5rem, 2vw + 1rem, 2.25rem);
  margin: 0 0 .25rem 0;
}
.subtitle{ margin: 0; color: var(--muted); }

.controls{
  display: flex;
  flex-wrap: wrap;
  gap: .6rem;
  align-items: center;
}

.search-label{ position: absolute; left: -9999px; }

.search{
  min-width: 14rem;
  flex: 1 1 220px;
  padding: .7rem .9rem;
  border-radius: .9rem;
  border: 1px solid var(--border-glass);
  background: var(--bg-glass);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow);
  outline: none;
}
.search:focus{ box-shadow: var(--shadow), var(--ring); }

.btn{
  padding: .7rem 1rem;
  border-radius: .9rem;
  border: 1px solid var(--border-glass);
  background: var(--bg-glass);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow);
  cursor: pointer;
}
.btn:hover{ transform: translateY(-1px); }
.btn:active{ transform: translateY(0); }
.btn-ghost{ background: transparent; border-style: dashed; }

.content{
  padding: 0 0 3rem;
}

.glass{
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  backdrop-filter: blur(10px) saturate(120%);
  border-radius: 1.25rem;
  box-shadow: var(--shadow);
}

.intro{
  padding: 1rem 1.25rem;
  margin: 0 0 1rem 0;
}

.tips{
  counter-reset: tip;
  display: grid;
  gap: 0.9rem;
  padding-left: 0;
  list-style: none;
}

.tip{
  padding: .5rem;
}

.tip-header{
  display: grid;
  grid-template-columns: 1fr auto;
  gap: .5rem;
  align-items: center;
}

.tip .left{
  display: grid;
  grid-template-columns: auto 1fr;
  gap: .75rem;
  align-items: center;
}

.tip-check{
  width: 1.2rem; height: 1.2rem;
}

.tip-title{
  font-weight: 700;
}

.tip-toggle{
  justify-self: end;
  padding: .5rem .8rem;
  border-radius: .75rem;
  border: 1px solid var(--border-glass);
  background: transparent;
  cursor: pointer;
}

.tip-body{
  padding: .5rem 0 .2rem .2rem;
  margin: .25rem 0 .2rem 2.1rem;
  color: var(--muted);
}

.site-footer{
  margin-top: 2rem;
  color: var(--muted);
  text-align: center;
}

/* Print styles: white background for readability */
@media print{
  body{ background: #fff; padding-left: 0; padding-right: 0; }
  .glass{ background: #fff; backdrop-filter: none; box-shadow: none; border-color: #ddd; }
  .btn, .controls{ display: none !important; }
}