/* ========== Reset e tokens ========== */
* { box-sizing: border-box; margin: 0; padding: 0; }

:root{
  --bg: #0b0b0b;            /* preto de fundo */
  --surface: #111111;        /* preto levemente elevado */
  --surface-2: #161616;      
  --text: #ffffff;           /* branco principal */
  --text-dim: #e6e6e6;       /* branco suave */
  --muted: #9ca3af;          /* cinza para detalhes */
  --line: #212121;           /* divisórias */
  --accent: #ffd60a;         /* amarelo principal */
  --accent-2: #ffea7a;       /* amarelo claro (hover/foco/números) */
  --danger: #ff6b6b;         /* mensagens de erro */
  --radius: 14px;
  --shadow: 0 8px 28px rgba(0,0,0,.35);
}

html, body{
  height: 100%;
  background: var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, "Helvetica Neue", Arial, "Noto Sans";
  line-height: 1.45;
}

/* ========== Header App (barra superior) ========== */
.app-header{
  position: sticky; /* permanece no topo ao rolar */
  top: 0;
  z-index: 100;
  background: var(--accent);         /* amarelo principal */
  color: #0b0b0b;                    /* texto preto */
  box-shadow: 0 8px 22px rgba(0,0,0,.25);
  border-bottom: 1px solid rgba(0,0,0,.25);
}

.app-header__inner{
  max-width: 1080px;
  margin: 0 auto;
  padding: 12px 16px;
  display: flex;
  align-items: center;
  gap: 14px;
}

.app-header__logo{
  display: block;
  height: 48px;
  width: auto;
  filter: drop-shadow(0 1px 0 rgba(255,255,255,.25));
}

.app-header__title{
  display: grid;
  line-height: 1.15;
}

.app-header__title strong{
  font-size: 1.15rem;
  font-weight: 900;
  letter-spacing: .2px;
}

.app-header__title span{
  font-size: .9rem;
  color: #222; /* contraste suave sobre o amarelo */
}

/* Responsivo da header */
@media (max-width: 520px){
  .app-header__title span{ display:none; }
  .app-header__logo{ height: 40px; }
}

/* ========== Layout principal ========== */
.container{
  max-width: 880px;
  margin: 42px auto;
  padding: 0 16px;
}

.card{
  background: linear-gradient(180deg, var(--surface) 0%, var(--surface-2) 100%);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 16px;
  margin-bottom: 16px;
}

h1{
  font-size: 1.9rem;
  font-weight: 800;
  letter-spacing: 0.3px;
  margin-bottom: 18px;
}

h2{
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 12px;
}

/* ========== Campos do formulário ========== */
.field{
  display: grid;
  gap: 8px;
  margin-bottom: 12px;
}

label{
  font-weight: 700;
  color: var(--text-dim);
}

select{
  appearance: none;
  background: #0e0e0e;
  color: var(--text);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 12px 14px;
  outline: none;
  transition: border-color .15s ease, box-shadow .15s ease, transform .06s ease;
}

select:hover{
  border-color: var(--accent);
}

select:focus{
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(255, 214, 10, .25);
}

/* ========== Botão ========== */
.btn{
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: var(--accent);
  color: #111111;             /* texto preto no botão amarelo */
  font-weight: 900;
  border: none;
  padding: 12px 18px;
  border-radius: 12px;
  cursor: pointer;
  transition: transform .06s ease, filter .15s ease, box-shadow .15s ease;
  box-shadow: 0 6px 18px rgba(255, 214, 10, .25);
}

.btn:hover{
  filter: brightness(1.03);
}

.btn:active{
  transform: translateY(1px);
}

.btn:disabled{
  opacity: .6;
  cursor: not-allowed;
  box-shadow: none;
}

/* Foco visível (acessibilidade) */
:where(button, [role="button"], select, a, summary):focus-visible{
  outline: 3px solid var(--accent-2);
  outline-offset: 2px;
  border-radius: 12px;
}

/* ========== Mensagens e resultados ========== */
.error{
  margin-top: 8px;
  color: var(--danger);
  font-weight: 700;
  min-height: 1.25em; /* evita pulo de layout */
}

.result{
  border: 1px solid var(--line);
}

.result .result-row{
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 0;
  border-top: 1px dashed var(--line);
}

.result .result-row:first-of-type{
  border-top: none;
}

.result .result-row span{
  color: var(--muted);
}

.result .result-row strong{
  font-size: 1.05rem;
  font-weight: 900;
  color: var(--accent-2);      /* amarelo claro nos números */
  text-shadow: 0 1px 0 rgba(0,0,0,.25);
}

/* ========== Detalhes / Observações ========== */
.note{
  color: var(--text-dim);
  font-size: .96rem;
}

.note summary{
  cursor: pointer;
  font-weight: 800;
  color: var(--accent);
  list-style: none;
}

.note summary::-webkit-details-marker{ display: none; }

.note[open]{
  border-color: rgba(255, 214, 10, .3);
}

/* ========== Estados sutis ========== */
.card:hover{
  border-color: rgba(255, 214, 10, .15);
}

/* ========== Utilidades responsivas ========== */
@media (max-width: 520px){
  h1{ font-size: 1.6rem; }
  .btn{ width: 100%; }
}

/* ========== Respeito a usuários com movimento reduzido ========== */
@media (prefers-reduced-motion: reduce){
  * { transition: none !important; }
}