/* Reset e correção de overflow */
*,
*::before,
*::after { box-sizing: border-box; }

html { overflow-x: hidden; }

/* Estilo padrão (modo escuro) */
body {
  margin: 0;
  padding: 80px 0 0;   /* empurra o conteúdo para baixo do header fixo */
  font-family: 'Montserrat', 'Proxima Nova', Arial, Helvetica, sans-serif;
  background-color: #111; /* fundo escuro */
  color: #fff; /* texto branco */
  line-height: 1.6;
  transition: background-color 0.3s ease, color 0.3s ease;
}

/* HEADER FIXO */
header {
  position: fixed;        /* fixa o header */
  top: 0;
  left: 0;
  right: 0;               /* impede estouro lateral por causa do padding */
  z-index: 1000;
  background: linear-gradient(135deg, #d8929c, #6b4c9a, #243c96);
  padding: 12px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: nowrap;        /* não deixa quebrar linha */
  border-bottom: 2px solid #ffcc00;
  transition: background-color 0.3s ease, border-color 0.3s ease;
  overflow: hidden;         /* evita quebra estranha */
}

/* Título */
header h1 {
  font-size: 22px;
  font-weight: 600;
  color: #ffffff !important;
  margin: 0;
  letter-spacing: 1px;
  text-shadow: 0 2px 4px rgba(0,0,0,0.3);
}

/* Grupos do header */
.header-left,
.header-right {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;          /* permite encolher corretamente */
}
.header-left { flex: 1 1 auto; }   /* ocupa espaço restante */
.header-right { 
  flex: 0 0 auto;        /* não deixa quebrar */
  white-space: nowrap;   /* mantém ícones na mesma linha */
}

/* Foto autor */
.author-photo {
  width: 50px;
  height: 50px;
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  border: 2px solid #f1c131a7;
  box-shadow: 0 0 8px rgba(190, 189, 189, 0.6);
  object-fit: cover;
}

/* Ícones sociais */
.social-icon {
  font-size: 22px;
  color: #fff;
  transition: all 0.3s ease;
  display: flex;              /* alinhamento consistente */
  align-items: center;
  justify-content: center;
  text-decoration: none;      /* remove linha sublinhada */
  line-height: 1;             /* remove espaço extra abaixo */
}

.social-icon.instagram:hover {
  color: #e4405f;
  transform: scale(1.2);
}

.social-icon.youtube:hover {
  color: #ff0000;
  transform: scale(1.2);
}

/* Botão Comprar */
.btncomprar {
  background: linear-gradient(135deg, #6b4c9a, #243c96);
  color: #fff;
  padding: 10px 16px;
  border-radius: 12px;
  text-decoration: none;
  font-weight: 600;
  transition: all 0.3s ease;
  box-shadow: 0 4px 10px rgba(0,0,0,0.3);
  display: inline-block;
  white-space: nowrap;    /* evita quebrar o texto do botão */
  margin-bottom: 20px;    /* afasta do h1 do container */
}

.btncomprar:hover {
  background: linear-gradient(135deg, #8a5cc2, #3450c6);
  transform: translateY(-3px);
}

.btncomprar:active {
  transform: scale(0.92);
  background: linear-gradient(135deg, #ffcc00, #ff8c00);
  color: #000;
}

/* Alinhamento no container */
.container .btncomprar {
  display: block;          /* ocupa a linha toda no mobile */
  text-align: center;
}

/* Desktop: botão alinhado à direita */
@media (min-width: 721px) {
  .container .btncomprar {
    display: inline-block;  /* volta a ser inline */
    float: right;           /* joga para a direita */
    margin-bottom: 20px;
    margin-left: 20px;      /* respiro do texto */
  }
}

/* Conteúdo */
.container {
  max-width: 700px;
  margin: 40px auto;
  padding: 20px;
  transition: background-color 0.3s ease;
}

.titulo {
  font-size: 28px;
  font-weight: 600;
  margin-bottom: 10px;
}

.autor {
  font-size: 14px;
  color: #aaa;
  margin-bottom: 30px;
  transition: color 0.3s ease;
}

.letra p {
  margin: 10px 0;
  font-size: 18px;
}

.letra {
  opacity: 0;
  transform: translateY(40px);
  animation: fadeInUp 1s ease-out forwards;
}

@keyframes fadeInUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.letra .highlight {
  background-color: #2a2344;
  display: inline-block;
  padding: 3px 5px;
  border-radius: 4px;
  transition: background-color 0.3s ease, color 0.3s ease;
}

/* Modo claro */
body:not(.dark-mode) {
  background-color: #fff;
  color: #222;
}

body:not(.dark-mode) header {
  background-color: #f5f5f5;
  border-bottom-color: #cc9900;
}

body:not(.dark-mode) header h1 { color: #cc9900; }
body:not(.dark-mode) .container { background-color: #fafafa; }
body:not(.dark-mode) .autor { color: #555; }
body:not(.dark-mode) .letra .highlight { background-color: #ddd; color: #444; }

/* Dark mode ativo */
body.dark-mode { background-color: #111; color: #fff; }
body.dark-mode header { background-color: #000; border-bottom-color: #ffcc00; }
body.dark-mode header h1 { color: #ffcc00; }
body.dark-mode .container { background-color: #1a1a1a; }
body.dark-mode .autor { color: #aaa; }
body.dark-mode .letra .highlight { background-color: #2a2344; color: #fff; }

/* Responsividade */
@media (max-width: 720px) {
  header { padding: 10px 12px; gap: 10px; }
  .author-photo { width: 44px; height: 44px; }
  header h1 { font-size: 20px; }
}

@media (max-width: 520px) {
  header { padding: 10px; }
  .header-right { gap: 16px; justify-content: flex-end; } /* ícones alinhados à direita */
  .btncomprar { width: 100%; text-align: center; }
}