/* ------------------------------------
   1. DESIGN TOKENS
------------------------------------ */
:root {
  /* --- Paleta --- */
  --color-bg:           #0D1117;   /* Fundo principal: preto grafite profundo */
  --color-surface:      #161B22;   /* Superfície de cards */
  --color-surface-alt:  #1F2937;   /* Cards de resultado, hover state */
  --color-border:       #30363D;   /* Bordas sutis */
  --color-accent:       #00E5FF;   /* Ciano neon — destaque primário */
  --color-accent-glow:  rgba(0, 229, 255, 0.15); /* Glow de botões/inputs ativos */
  --color-text-primary: #E6EDF3;   /* Texto principal */
  --color-text-muted:   #8B949E;   /* Labels secundários, descrições, unidades */
  --color-error:        #FF4444;   /* Mensagem e borda de erro */

  /* --- Tipografia --- */
  --font-family:        'Inter', system-ui, sans-serif;
  --font-size-base:     16px;      /* Mínimo para evitar auto-zoom em iOS */
  --font-size-sm:       0.875rem;  /* 14px */
  --font-size-lg:       1.125rem;  /* 18px */
  --font-size-xl:       1.5rem;    /* 24px */
  --font-size-2xl:      2rem;      /* 32px — resultado em destaque */

  /* --- Espaçamento --- */
  --space-xs:  0.25rem; /* 4px */
  --space-sm:  0.5rem;  /* 8px */
  --space-md:  1rem;    /* 16px */
  --space-lg:  1.5rem;  /* 24px */
  --space-xl:  2rem;    /* 32px */

  /* --- Forma --- */
  --radius-sm:  6px;
  --radius-md:  12px;
  --radius-lg:  20px;
  --radius-pill: 999px;

  /* --- Sombras e Glow --- */
  --shadow-card:  0 4px 24px rgba(0, 0, 0, 0.4);
  --glow-accent:  0 0 16px rgba(0, 229, 255, 0.3);
}

/* ------------------------------------
   2. RESET & GLOBAL
------------------------------------ */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  background-color: var(--color-bg);
  color: var(--color-text-primary);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
}

ul {
  list-style: none;
}

.container {
  width: 100%;
  max-width: 1024px;
  margin: 0 auto;
  padding: 0 var(--space-md);
}

/* ------------------------------------
   3. SPA VIEWS
------------------------------------ */
.view {
  display: none;
}

.view.active-view {
  display: block;
  animation: fadeIn 0.25s ease forwards;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ------------------------------------
   4. APP HEADER
------------------------------------ */
.app-header {
  position: sticky;
  top: 0;
  background: rgba(13, 17, 23, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-md);
  z-index: 10;
}

.logo-container {
  display: flex;
  align-items: baseline;
  gap: var(--space-sm);
  max-width: 1024px;
  margin: 0 auto;
}

.logo {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-accent);
  letter-spacing: -0.5px;
}

.tagline {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

/* ------------------------------------
   5. HUB / DASHBOARD
------------------------------------ */
.view-title {
  font-size: var(--font-size-lg);
  font-weight: 600;
  margin: var(--space-xl) 0 var(--space-md);
  color: var(--color-text-primary);
}

.tools-grid {
  display: grid;
  grid-template-columns: 1fr; /* Mobile-first */
  gap: var(--space-md);
  padding-bottom: var(--space-xl);
}

.tool-card {
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-md);
  text-align: left;
  transition: all 0.2s ease;
  width: 100%;
}

.tool-card:hover, .tool-card:focus-visible {
  transform: translateY(-2px);
  border-color: var(--color-accent);
  box-shadow: var(--shadow-card), var(--glow-accent);
  outline: none;
}

.tool-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  background-color: var(--color-surface-alt);
  border-radius: var(--radius-md);
  font-size: var(--font-size-xl);
  color: var(--color-accent);
  flex-shrink: 0;
}

.tool-badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-bg);
  background-color: var(--color-accent);
  padding: 2px 8px;
  border-radius: var(--radius-pill);
  margin-bottom: var(--space-xs);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.tool-name {
  font-size: var(--font-size-lg);
  font-weight: 600;
  margin-bottom: 4px;
}

.tool-desc {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

/* ------------------------------------
   6. TOOL PAGES (Wavelength)
------------------------------------ */
.tool-header {
  padding: var(--space-md) var(--space-md);
  display: flex;
  align-items: center;
  gap: var(--space-md);
  border-bottom: 1px solid var(--color-border);
  margin-bottom: var(--space-xl);
}

.btn-back {
  display: flex;
  align-items: center;
  gap: 4px;
  color: var(--color-text-muted);
  font-weight: 500;
  font-size: var(--font-size-sm);
  transition: color 0.2s;
  min-height: 44px; /* Touch target */
  padding-right: var(--space-sm);
}

.btn-back:hover {
  color: var(--color-text-primary);
}

.tool-title {
  font-size: var(--font-size-xl);
  font-weight: 600;
}

.tool-subtitle {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  font-weight: 400;
}

.tool-content {
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
  flex: 1;
}

/* --- Input Area --- */
.input-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.input-group label {
  font-weight: 500;
  color: var(--color-text-muted);
}

.input-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.input-wrapper input {
  width: 100%;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-primary);
  font-family: var(--font-family);
  font-size: var(--font-size-2xl);
  font-weight: 700;
  padding: var(--space-sm) var(--space-lg);
  padding-right: 60px; /* Space for unit */
  min-height: 64px;
  text-align: center;
  transition: all 0.2s;
  -moz-appearance: textfield;
}

.input-wrapper input::-webkit-outer-spin-button,
.input-wrapper input::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

.input-wrapper input:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 2px var(--color-accent-glow);
}

.input-wrapper input.error {
  border-color: var(--color-error);
}

.input-unit {
  position: absolute;
  right: var(--space-lg);
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--color-text-muted);
}

.error-msg {
  color: var(--color-error);
  font-size: var(--font-size-sm);
  min-height: 20px;
}

/* --- Quick Taps --- */
.quick-taps {
  display: flex;
  gap: var(--space-sm);
  overflow-x: auto;
  padding-bottom: var(--space-sm); /* Espaço para scrollbar se houver */
  scrollbar-width: none; /* Firefox */
}

.quick-taps::-webkit-scrollbar {
  display: none; /* Chrome/Safari */
}

.btn-tap {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  color: var(--color-text-primary);
  border-radius: var(--radius-pill);
  padding: var(--space-sm) var(--space-md);
  font-weight: 500;
  font-size: var(--font-size-sm);
  white-space: nowrap;
  min-height: 48px; /* Touch target */
  transition: all 0.2s;
}

.btn-tap:hover, .btn-tap:active {
  background-color: var(--color-surface-alt);
  border-color: var(--color-accent);
  color: var(--color-accent);
}

/* --- Results Area --- */
.results-grid {
  display: grid;
  grid-template-columns: 1fr; /* Mobile-first */
  gap: var(--space-md);
}

.result-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
}

.res-label {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  font-weight: 500;
  margin-bottom: var(--space-sm);
}

.res-value {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: var(--color-accent);
  margin-bottom: 4px;
}

.res-value.empty {
  color: var(--color-text-muted);
}

.res-sub {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

.tool-footer {
  text-align: center;
  padding: var(--space-xl) var(--space-md);
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  margin-top: auto;
}

.tool-footer strong {
  color: var(--color-text-primary);
}

/* ------------------------------------
   7. MEDIA QUERIES (TABLET E DESKTOP)
------------------------------------ */
@media (min-width: 640px) {
  .tools-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .results-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  
  .quick-taps {
    justify-content: center;
  }
}

@media (min-width: 1024px) {
  .tools-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}