/* Shared styles for cursos 03 & 04 — extends the main course look */

.bg-decor.alt{
  background-image:
    radial-gradient(circle at 18% 22%, rgba(198,168,255,.28) 0 16px, transparent 17px),
    radial-gradient(circle at 84% 18%, rgba(127,224,179,.28) 0 14px, transparent 15px),
    radial-gradient(circle at 22% 82%, rgba(124,196,255,.28) 0 16px, transparent 17px),
    radial-gradient(circle at 78% 80%, rgba(255,138,122,.28) 0 14px, transparent 15px);
}

.hero-pill{
  display:inline-flex; align-items:center; gap:8px;
  background: var(--lav); border:3px solid var(--line); border-radius:999px;
  padding: 6px 14px; font-weight:700; font-size: 13px;
  box-shadow: var(--shadow);
}
.hero-pill.mint{ background: var(--mint); }

/* ER diagram */
.er-stage{
  position: relative;
  background:
    linear-gradient(rgba(34,34,59,.06) 1px, transparent 1px) 0 0/24px 24px,
    linear-gradient(90deg, rgba(34,34,59,.06) 1px, transparent 1px) 0 0/24px 24px,
    #fffdf3;
  border:3px solid var(--line);
  border-radius: var(--r-md);
  padding: 20px;
  min-height: 560px;
  overflow:auto;
  box-shadow: var(--shadow);
}
.er-stage .wrap{ position: relative; min-width: 940px; min-height: 540px; }

.er-table{
  position: absolute;
  background: white;
  border: 3px solid var(--line);
  border-radius: 12px;
  box-shadow: 3px 3px 0 var(--line);
  font-size: 12px;
  min-width: 160px;
  overflow: hidden;
  transition: transform .15s, box-shadow .15s;
  cursor: pointer;
}
.er-table:hover{
  transform: translate(-2px, -2px);
  box-shadow: 6px 6px 0 var(--line);
  z-index: 5;
}
.er-table.active{
  outline: 3px solid var(--coral-deep);
  z-index: 6;
}
.er-table .er-head{
  background: var(--lav);
  border-bottom: 2px solid var(--line);
  padding: 6px 10px;
  font-weight: 700;
  font-size: 13px;
  display: flex; align-items:center; gap: 6px;
}
.er-table.sky  .er-head{ background: var(--sky); }
.er-table.mint .er-head{ background: var(--mint); }
.er-table.sun  .er-head{ background: var(--sun); }
.er-table.coral .er-head{ background: var(--coral); }
.er-table.rose .er-head{ background: var(--rose); }
.er-table ul{
  margin: 0; padding: 4px 10px; list-style: none;
}
.er-table li{
  font-family: var(--mono);
  font-size: 11px;
  padding: 2px 0;
  display: flex; align-items: center; gap: 6px;
}
.er-table li .tag{
  font-size: 9px; font-weight: 700;
  border:1px solid var(--line); border-radius: 4px;
  padding: 0 4px;
  background: white;
  margin-left: auto;
}
.er-table li .tag.pk{ background: var(--sun); }
.er-table li .tag.fk{ background: var(--coral); }
.er-table li .tag.nn{ background: var(--mint); }
.er-table li .tag.un{ background: var(--sky); }
.er-table li .tag.ck{ background: var(--lav); }

.er-svg{
  position: absolute; inset: 0; pointer-events: none;
  width: 100%; height: 100%;
}
.er-svg path{
  fill: none;
  stroke: var(--ink); stroke-width: 2;
  stroke-dasharray: 5 4;
  opacity: .55;
}
.er-svg path.hi{
  stroke: var(--coral-deep); opacity: 1; stroke-width: 3;
  stroke-dasharray: none;
}

.er-legend{
  display:flex; flex-wrap:wrap; gap:8px; margin-top: 14px;
}

/* SQL DDL block with line numbers */
.code-lined{
  background: #22223b; color: #f6f4ed;
  border:3px solid var(--line); border-radius: var(--r-md);
  box-shadow: var(--shadow);
  overflow: hidden;
  font-family: var(--mono); font-size: 13px;
  line-height: 1.6;
}
.code-lined .header{
  display: flex; align-items: center; gap: 8px;
  padding: 8px 14px;
  background: #1a1a30;
  border-bottom: 2px solid #000;
  color: #c6c6d4; font-size: 12px;
}
.code-lined .header .dots{ display:flex; gap:6px; margin-right: 8px; }
.code-lined .header .dots span{
  width: 11px; height: 11px; border-radius: 50%; background: #555;
}
.code-lined .header .dots span:nth-child(1){ background: #ff5f57 }
.code-lined .header .dots span:nth-child(2){ background: #febc2e }
.code-lined .header .dots span:nth-child(3){ background: #28c840 }
.code-lined pre{
  margin: 0; padding: 14px 16px; white-space: pre; overflow-x: auto;
}
.code-lined .kw{ color: #ffd34d; font-weight: 700 }
.code-lined .ty{ color: #7cc4ff; font-weight: 700 }
.code-lined .cn{ color: #7fe0b3 }
.code-lined .cm{ color: #8a8aa8; font-style: italic }
.code-lined .str{ color: #ff8a7a }
.code-lined .num{ color: #ffb3d1 }

/* download button */
.dl-card{
  background: white;
  border: 3px solid var(--line);
  border-radius: var(--r-md);
  box-shadow: var(--shadow);
  padding: 18px;
  display: flex; align-items:center; gap: 14px;
}
.dl-card .file-ico{
  flex: 0 0 auto;
  width: 52px; height: 64px;
  background: var(--mint); border:3px solid var(--line); border-radius: 8px;
  position: relative;
  display: grid; place-items: center;
  font-family: var(--mono); font-weight: 700; font-size: 12px;
  color: var(--ink);
}
.dl-card .file-ico::before{
  content:""; position:absolute; top:-3px; right:-3px;
  width: 16px; height: 16px;
  background: var(--bg);
  border-left: 3px solid var(--line);
  border-bottom: 3px solid var(--line);
}
.dl-card .meta{ flex: 1; }
.dl-card .meta .name{ font-weight: 700; font-family: var(--mono); font-size: 15px; }
.dl-card .meta .desc{ color: var(--ink-soft); font-size: 13px; margin-top: 2px; }

/* feature tiles (mock of app screens) */
.feature-grid{
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px;
}
@media (max-width: 780px){ .feature-grid{ grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 480px){ .feature-grid{ grid-template-columns: 1fr; } }
.feature-tile{
  background: white;
  border: 3px solid var(--line); border-radius: var(--r-md);
  box-shadow: var(--shadow);
  padding: 14px;
  position: relative;
}
.feature-tile .tile-ico{
  width: 44px; height: 44px;
  background: var(--sky); border:3px solid var(--line); border-radius: 12px;
  display: grid; place-items: center;
  font-size: 24px; margin-bottom: 8px;
  box-shadow: 2px 2px 0 var(--line);
}
.feature-tile.lav .tile-ico{ background: var(--lav); }
.feature-tile.mint .tile-ico{ background: var(--mint); }
.feature-tile.coral .tile-ico{ background: var(--coral); }
.feature-tile.sun .tile-ico{ background: var(--sun); }
.feature-tile.rose .tile-ico{ background: var(--rose); }
.feature-tile h3{
  margin: 0 0 4px;
  font-size: 17px;
  font-weight: 600;
}
.feature-tile p{
  margin: 0;
  color: var(--ink-soft); font-size: 13px; line-height: 1.45;
}
.feature-tile .involves{
  margin-top: 10px;
  font-size: 11px;
  font-family: var(--mono);
  color: var(--ink-soft);
  display: flex; flex-wrap: wrap; gap: 4px;
}
.feature-tile .involves span{
  background: #f6efd9;
  border:1px solid #d9c98a;
  padding: 2px 6px;
  border-radius: 4px;
}

/* Phone mockup */
.phone{
  width: 280px;
  border: 3px solid var(--line);
  border-radius: 32px;
  background: white;
  padding: 14px 10px;
  box-shadow: 4px 4px 0 var(--line);
  flex: 0 0 auto;
}
.phone .notch{
  width: 80px; height: 14px;
  background: var(--line);
  border-radius: 0 0 12px 12px;
  margin: 0 auto 10px;
}
.phone .screen{
  background: #fbf5e6;
  border-radius: 18px;
  padding: 12px;
  border: 2px solid var(--line);
  min-height: 420px;
}

/* Drop-zone for SQL execution */
.exec-zone{
  background: #1a1a30;
  color: #f6f4ed;
  border: 3px solid var(--line);
  border-radius: var(--r-md);
  padding: 14px 16px;
  font-family: var(--mono); font-size: 12px;
  box-shadow: var(--shadow);
}
.exec-zone .prompt{ color: var(--mint); }
.exec-zone .out{ color: #c6c6d4; }

/* Drag-and-drop entity sort game */
.sort-game{
  display:grid; grid-template-columns: 1fr 1fr; gap: 18px;
}
@media (max-width: 720px){ .sort-game{ grid-template-columns: 1fr; } }
.sort-col{
  background: white;
  border: 3px solid var(--line);
  border-radius: var(--r-md);
  box-shadow: var(--shadow);
  padding: 14px;
  min-height: 220px;
}
.sort-col h4{
  margin: 0 0 10px;
  font-size: 15px;
  display: flex; align-items: center; gap: 8px;
}
.sort-col h4 .pill{
  background: var(--sun); border:2px solid var(--line); border-radius:999px;
  padding: 2px 10px; font-size: 11px;
  font-family: var(--mono);
}
.sort-pool{ background: #ede2ff; }
.sort-target{ background: #e0f7ec; }
.sort-chip{
  display: inline-flex; align-items: center; gap: 6px;
  background: white; border: 2px solid var(--line); border-radius: 999px;
  padding: 4px 12px; margin: 4px 4px 4px 0;
  font-family: var(--mono); font-size: 12px;
  cursor: grab;
  box-shadow: 2px 2px 0 var(--line);
  user-select: none;
}
.sort-chip.correct{ background: var(--mint); }
.sort-chip.wrong{ background: var(--coral); }
.sort-chip:active{ cursor: grabbing; }

/* Diff highlight for constraint examples */
.cnst-row{
  display:grid; grid-template-columns: 1fr 1fr; gap: 14px;
  align-items: stretch;
}
@media (max-width: 720px){ .cnst-row{ grid-template-columns: 1fr; } }
.cnst-card{
  border: 3px solid var(--line);
  border-radius: var(--r-md);
  padding: 14px;
  background: white;
  box-shadow: var(--shadow);
}
.cnst-card.bad{ background: #ffe1db; }
.cnst-card.good{ background: #e0f7ec; }
.cnst-card .lab{
  font-weight: 700; font-size: 12px;
  text-transform: uppercase; letter-spacing: .06em;
  margin-bottom: 8px;
}
.cnst-card.bad .lab{ color: var(--coral-deep); }
.cnst-card.good .lab{ color: var(--mint-deep); }