:root {
  --bg-color: #f4f7f6;
  --card-bg: #ffffff;
  --text-color: #1a252c;
  --primary-color: #0d5c75;
  --accent-color: #25d569;
  --libras-color: #27ae60;
  --emergency-color: #e8310d;
  --btn-hover: #1aaf42;
  --font-scale: 1;
}

/* Alto Contraste */
body.high-contrast {
  --bg-color: #000000;
  --card-bg: #121212;
  --text-color: #ffffff;
  --primary-color: #ffff00;
  --accent-color: #00ffff;
  --libras-color: #e92217;
  --btn-hover: #cccc00;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  font-size: calc(18px * var(--font-scale));
  line-height: 1.6;
  background-color: var(--bg-color);
  color: var(--text-color);
  margin: 0;
  padding: 0;
  transition: background-color 0.3s, color 0.3s;
}

/* Alerta Visual Superior */
.visual-alert-banner {
  background-color: #ff0000;
  color: #ffffff;
  font-weight: bold;
  text-align: center;
  padding: 15px;
  font-size: 1.2rem;
  animation: pulse-alert 1s infinite alternate;
}

@keyframes pulse-alert {
  from { opacity: 1; }
  to { opacity: 0.5; }
}

/* Barra de Acessibilidade */
.accessibility-bar {
  background-color: var(--primary-color);
  color: white;
  padding: 15px;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.accessibility-bar button {
  font-size: 1rem;
  font-weight: bold;
  padding: 10px 15px;
  border: 2px solid white;
  border-radius: 8px;
  cursor: pointer;
  background-color: #ffffff;
  color: #000000;
}

.accessibility-bar button:hover,
.accessibility-bar button:focus {
  outline: 3px solid #ffcc00;
  background-color: #e0e0e0;
}

header {
  text-align: center;
  padding: 30px 20px 10px;
}

h1 {
  font-size: calc(2.2rem * var(--font-scale));
  margin-bottom: 10px;
}

/* Layout Lado a Lado (Conteúdo + Libras) */
.app-layout {
  display: flex;
  max-width: 1100px;
  margin: 0 auto;
  padding: 20px;
  gap: 25px;
  align-items: flex-start;
}

main {
  flex: 1;
}

/* Card de Conteúdo */
.card {
  background-color: var(--card-bg);
  border-radius: 12px;
  padding: 25px;
  margin-bottom: 25px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.08);
  border-left: 8px solid var(--accent-color);
}

.card h2 {
  font-size: calc(1.5rem * var(--font-scale));
  margin-top: 0;
}

.btn-action-card {
  background-color: var(--primary-color);
  color: #ffffff;
  border: 2px solid var(--text-color);
  padding: 8px 16px;
  font-size: calc(1rem * var(--font-scale));
  font-weight: bold;
  border-radius: 8px;
  cursor: pointer;
  margin-top: 10px;
  margin-right: 8px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.btn-libras-card {
  background-color: var(--libras-color);
  color: #ffffff;
}

body.high-contrast .btn-action-card {
  background-color: #000000;
  color: #ffff00;
  border-color: #ffff00;
}

.btn-action-card:hover,
.btn-action-card:focus {
  outline: 3px solid var(--accent-color);
  opacity: 0.9;
}

/* Painel de Libras do Lado */
.libras-panel {
  width: 320px;
  position: sticky;
  top: 90px;
  background-color: var(--card-bg);
  border: 3px solid var(--libras-color);
  border-radius: 12px;
  box-shadow: 0 4px 16px rgba(0,0,0,0.15);
  overflow: hidden;
  transition: all 0.3s ease;
}

.libras-panel.hidden {
  display: none;
}

.libras-header {
  background-color: var(--libras-color);
  color: #ffffff;
  padding: 12px;
  font-weight: bold;
  font-size: 1.1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

body.high-contrast .libras-header {
  background-color: #000000;
  color: #00ff66;
  border-bottom: 2px solid #00ff66;
}

.btn-close-libras {
  background: transparent;
  border: none;
  color: white;
  font-size: 1.2rem;
  font-weight: bold;
  cursor: pointer;
}

.libras-video-container {
  position: relative;
  width: 100%;
  height: 260px;
  background-color: #000;
  display: flex;
  justify-content: center;
  align-items: center;
}

.libras-video-container img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.libras-status-badge {
  position: absolute;
  bottom: 10px;
  left: 10px;
  background: rgba(0, 0, 0, 0.75);
  color: #fff;
  padding: 4px 10px;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: bold;
}

.libras-caption {
  padding: 15px;
  font-size: 0.95rem;
  background-color: var(--card-bg);
  color: var(--text-color);
  border-top: 1px solid #ddd;
  min-height: 50px;
}

/* Emergência */
.emergency-box {
  text-align: center;
  background-color: #fadbd8;
  border: 3px solid var(--emergency-color);
  border-radius: 12px;
  padding: 20px;
  margin-top: 30px;
}

body.high-contrast .emergency-box {
  background-color: #330000;
}

.btn-emergency {
  display: inline-block;
  background-color: var(--emergency-color);
  color: white !important;
  font-size: calc(1.6rem * var(--font-scale));
  font-weight: bold;
  padding: 15px 30px;
  text-decoration: none;
  border-radius: 10px;
  box-shadow: 0 4px 8px rgba(0,0,0,0.2);
  border: none;
  cursor: pointer;
}

/* Responsividade para Telas Menores (Mobile) */
@media (max-width: 850px) {
  .app-layout {
    flex-direction: column-reverse;
  }
  .libras-panel {
    width: 100%;
    position: static;
  }
}