:root {
  --app-bg: #f7f8fa;
  --header-bg: #ffffff;
  --text-primary: #1c1c1e;
  --text-secondary: #6b6b6b;
  --border-color: #e9e9eb;
  --chat-bg: #ffffff;
  --font-main: -apple-system, BlinkMacSystemFont, Roboto, sans-serif;
  --font-chinese: "PingFang SC", "Noto Sans SC", sans-serif;

  /* Cores da Navegação */
  --nav-bg: #ffffff;
  --nav-active-bg: #007aff;
  --nav-active-text: #007aff; /* Alterado para azul */
  --nav-inactive-text: #8e8e93;
  --nav-height: 78px;
  --chat-form-height: 74px;
  --chat-bottom-gap: clamp(9rem, 18vh, 14rem);

  /* Cores de Destaque */
  --hsk1-color: #44b875;
  --hsk2-color: #31a5f5;
  --user-bubble-bg: #007aff;
  --send-button-bg: #007aff;
}

body {
  font-family: var(--font-main);
  margin: 0;
  /* Efeito Sky Glow */
  background:
    radial-gradient(
      900px 380px at 50% -140px,
      rgba(0, 122, 255, 0.1),
      transparent 60%
    ),
    var(--app-bg);
  color: var(--text-primary);
}

/* --- Layout Principal --- */
.mobile-layout-wrapper {
  display: flex;
  flex-direction: column;
  height: 100vh;
  height: 100dvh;
  box-sizing: border-box;
}

main {
  flex-grow: 1;
  overflow: hidden;
  padding: 0 16px calc(var(--nav-height) + env(safe-area-inset-bottom));
  box-sizing: border-box;
}

section {
  display: none;
  flex-direction: column;
  height: 100%;
}

section.active {
  display: flex;
}

/* Fallback: se o hash mudar (ex. navegação móvel), mostrar a seção alvo mesmo sem JS */
section:target {
  display: flex;
}

/* --- Header --- */
.app-header {
  background: url("/images/pingleeheader.png");
  background-size: cover;
  background-position: center top;
  background-repeat: no-repeat;
  color: var(--text-primary);
  padding: calc(env(safe-area-inset-top) + 1rem) 1rem 1.25rem;
  text-align: center;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
  z-index: 10;
  position: sticky;
  top: 0;
  min-height: 120px;
}
.app-header h1 {
  margin: 0;
  font-size: 1.2rem;
  font-weight: 600;
}

@media (max-width: 720px) {
  .app-header {
    padding: calc(env(safe-area-inset-top) + 0.65rem) 0.8rem 0.85rem;
    min-height: 96px;
  }
}

/* --- BARRA DE NAVEGAÇÃO INFERIOR --- */
.mobile-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  display: flex;
  background-color: var(--nav-bg);
  border-top: 1px solid var(--border-color);
  box-shadow: 0 -2px 5px rgba(0, 0, 0, 0.05);
  padding: 8px 4px;
  padding-bottom: calc(8px + env(safe-area-inset-bottom));
  z-index: 100;
}

.nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  color: var(--nav-inactive-text);
  font-size: 11px;
  font-weight: 500;
  gap: 4px;
  flex: 1 1 0;
  min-width: 0;
  padding: 4px 0;
  border-radius: 10px;
  transition:
    background-color 0.25s,
    color 0.25s;
  text-align: center;
}

.nav-item img {
  width: 26px;
  height: 26px;
  object-fit: contain;
  transition: transform 0.2s;
}

/* Estilo do item ativo (Pill) */
.nav-item.active {
  color: var(--nav-active-bg);
  background-color: rgba(0, 122, 255, 0.12);
  font-weight: 700;
}
.nav-item.active img {
  transform: translateY(-1px);
}

.nav-item.active svg {
  fill: var(--nav-active-bg);
}

/* Estados de Hover/Focus para Desktop */
@media (hover: hover) {
  .nav-item:hover {
    background-color: rgba(0, 122, 255, 0.08);
    color: var(--nav-active-bg);
  }
}

.nav-item:focus-visible {
  outline: 2px solid var(--nav-active-bg);
  outline-offset: 2px;
}