body {
  padding-top: env(safe-area-inset-top);
  padding-bottom: env(safe-area-inset-bottom);
}

:root{
  --bg: #0b1220;
  --card: rgba(255,255,255,.06);
  --text: rgba(255,255,255,.92);
  --muted: rgba(255,255,255,.65);
  --stroke: rgba(255,255,255,.12);
  --accent: #6ee7ff;
  --accent2: #a78bfa;
  --danger: #ff6b6b;
  --shadow: 0 10px 30px rgba(0,0,0,.35);

  --radius: 18px;
  --gap: 14px;
  --max: 640px;
  --font: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Arial;
}

:root.light{
  --bg: #f6f7fb;
  --card: rgba(10,20,40,.06);
  --text: rgba(10,20,40,.92);
  --muted: rgba(10,20,40,.65);
  --stroke: rgba(10,20,40,.12);
  --shadow: 0 10px 30px rgba(10,20,40,.10);
}

*{box-sizing:border-box}
body{
  margin:0;
  font-family: var(--font);
  background: radial-gradient(900px 400px at 20% 0%, rgba(110,231,255,.20), transparent 60%),
              radial-gradient(900px 500px at 90% 10%, rgba(167,139,250,.18), transparent 60%),
              var(--bg);
  color: var(--text);
}

.app{
  max-width: var(--max);
  margin: 0 auto;
  min-height: 100vh;
  padding: 18px 16px 22px;
  display:flex;
  flex-direction:column;
  gap: var(--gap);
}

.topbar{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap: 12px;
  padding: 10px 4px;
}
h1{margin:0; font-size: 26px; letter-spacing:.2px}
.subtitle{margin:4px 0 0; color: var(--muted); font-size: 13px}

.content{
  display:flex;
  flex-direction:column;
  gap: var(--gap);
}

.card{
  background: linear-gradient(180deg, var(--card), rgba(255,255,255,.03));
  border: 1px solid var(--stroke);
  box-shadow: var(--shadow);
  border-radius: var(--radius);
  padding: 14px;
  backdrop-filter: blur(10px);
}

.row{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap: 10px;
}

h2{margin:0 0 10px; font-size: 16px; color: var(--text)}

.form{
  display:flex;
  flex-direction:column;
  gap: 10px;
}
label span{
  display:block;
  font-size: 12px;
  color: var(--muted);
  margin-bottom: 6px;
}
input, textarea{
  width:100%;
  padding: 12px 12px;
  border-radius: 14px;
  border: 1px solid var(--stroke);
  background: rgba(255,255,255,.04);
  color: var(--text);
  outline:none;
}
textarea{min-height: 84px; resize: vertical}

button{
  border: 0;
  border-radius: 14px;
  padding: 12px 12px;
  font-weight: 650;
  cursor:pointer;
}
.primary{
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  color: #08101e;
}
.ghost{
  background: rgba(255,255,255,.06);
  border: 1px solid var(--stroke);
  color: var(--text);
  padding: 10px 12px;
}
.danger{
  background: rgba(255,107,107,.14);
  border: 1px solid rgba(255,107,107,.35);
  color: var(--text);
}

.pill{
  font-size: 12px;
  padding: 6px 10px;
  border-radius: 999px;
  border: 1px solid var(--stroke);
  color: var(--muted);
  background: rgba(255,255,255,.03);
}

.list{
  list-style:none;
  padding:0;
  margin:0;
  display:flex;
  flex-direction:column;
  gap: 10px;
}

.item{
  display:flex;
  align-items:flex-start;
  gap: 12px;
  padding: 12px;
  border-radius: 14px;
  border: 1px solid var(--stroke);
  background: rgba(255,255,255,.03);
}
.item .meta{
  flex:1;
  display:flex;
  flex-direction:column;
  gap: 4px;
}
.item .title{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap: 10px;
  font-weight: 700;
}
.item .desc{color: var(--muted); font-size: 13px; line-height: 1.25}
.item .due{color: var(--muted); font-size: 12px}

.checkbox{
  width: 22px;
  height: 22px;
  border-radius: 7px;
  border: 1px solid var(--stroke);
  background: rgba(255,255,255,.03);
  display:grid;
  place-items:center;
  flex-shrink:0;
}
.checkbox input{display:none}
.checkbox .mark{opacity:.25; transform: translateY(-1px)}
.checkbox.checked{
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  border-color: transparent;
  color: #08101e;
}
.checkbox.checked .mark{opacity: 1}

.actions{
  display:flex;
  gap: 8px;
}
.iconbtn{
  background: rgba(255,255,255,.06);
  border: 1px solid var(--stroke);
  color: var(--text);
  padding: 8px 10px;
  border-radius: 12px;
  font-weight:700;
}

.empty{
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 13px;
  display:none;
}

.footer{
  margin-top: auto;
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap: 10px;
  color: var(--muted);
  font-size: 12px;
  padding: 6px 4px;
}

.item {
  animation: fadeIn .25s ease;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ====== ESTILO TAREA COMPLETADA ====== */
.item.completed {
  opacity: 0.6;
}

.item.completed .title span {
  text-decoration: line-through;
}

.item.completed .desc {
  text-decoration: line-through;
}