/* ================================
   RESET & VARIÁVEIS TEMÁTICAS
================================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: Arial, Helvetica, sans-serif;
}

:root {
    --azul-escuro: #020d27;
    --azul-medio: #063d8f;
    --azul-royal: #0055b8;
    --azul-claro: #1689ff;
    --celeste: #4db8ff;
    --branco: #ffffff;
    --cinza-claro: #dcecff;
    --cinza-texto: #a8c5eb;
    --sombra: rgba(0, 0, 0, 0.4);
}

html {
    scroll-behavior: smooth;
}

/* PLANO DE FUNDO (ILUMINAÇÃO CELESTE + PROFUNDIDADE) */
body {
    min-height: 100vh;
    background-color: var(--azul-escuro);
    background-image:
        radial-gradient(circle at 50% 15%, rgba(22, 137, 255, 0.25) 0%, transparent 60%),
        radial-gradient(circle at 50% 50%, rgba(6, 61, 143, 0.3) 0%, transparent 70%),
        radial-gradient(circle at 50% 100%, rgba(2, 13, 39, 0.8) 0%, transparent 80%),
        repeating-linear-gradient(45deg, rgba(255, 255, 255, 0.012) 0px, rgba(255, 255, 255, 0.012) 2px, transparent 2px, transparent 12px),
        linear-gradient(180deg, #010a1c 0%, #031742 40%, #020d27 80%, #010817 100%);
    background-attachment: fixed;
    color: var(--branco);
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
    overflow-x: hidden;
}

/* ================================
   ESTRUTURA PRINCIPAL DA PÁGINA DO QUIZ
================================ */
.quiz-pagina {
    width: 100%;
    max-width: 600px;
    background: rgba(3, 27, 78, 0.78);
    border: 1px solid rgba(255, 255, 255, 0.18);
    border-radius: 28px;
    padding: 35px 30px;
    box-shadow: 0 25px 70px var(--sombra), inset 0 1px 0 rgba(255, 255, 255, 0.12);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    animation: aparecer 0.8s ease-out;
}

@keyframes aparecer {
    from {
        opacity: 0;
        transform: translateY(30px) scale(0.96);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

/* ================================
   TOPO DO QUIZ
================================ */
.quiz-topo {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    padding-bottom: 15px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.voltar {
    color: var(--cinza-texto);
    text-decoration: none;
    font-size: 14px;
    font-weight: 700;
    transition: color 0.2s ease;
}

.voltar:hover {
    color: var(--branco);
}

.progresso {
    font-size: 11px;
    color: var(--cinza-texto);
    letter-spacing: 1px;
    font-weight: 700;
}

.progresso strong {
    color: var(--branco);
    font-size: 16px;
}

.progresso small {
    color: var(--celeste);
}

.simbolo {
    color: var(--celeste);
    font-size: 22px;
    text-shadow: 0 0 10px rgba(77, 184, 255, 0.6);
}

/* ================================
   SEÇÃO DA QUESTÃO
================================ */
.questao {
    margin-bottom: 25px;
}

.questao-numero {
    font-size: 12px;
    font-weight: 800;
    color: var(--celeste);
    margin-bottom: 10px;
    letter-spacing: 2px;
}

.questao h1 {
    font-size: 22px;
    line-height: 1.4;
    font-weight: 800;
    color: var(--branco);
    margin-bottom: 10px;
}

.instrucao {
    font-size: 14px;
    color: var(--cinza-texto);
    margin-bottom: 25px;
}

/* ================================
   OPÇÕES DE RESPOSTA
================================ */
.opcoes {
    display: flex;
    flex-direction: column;
    gap: 14px;
    margin-bottom: 25px;
}

.opcao {
    display: flex;
    align-items: center;
    background: rgba(255, 255, 255, 0.03);
    border: 2px solid rgba(255, 255, 255, 0.1);
    color: var(--branco);
    padding: 16px;
    border-radius: 14px;
    cursor: pointer;
    font-size: 15px;
    font-weight: 600;
    text-align: left;
    transition: all 0.25s ease;
}

.opcao:hover {
    border-color: var(--celeste);
    background: rgba(255, 255, 255, 0.07);
    transform: translateY(-2px);
}

.opcao .letra {
    background: rgba(255, 255, 255, 0.1);
    color: var(--celeste);
    padding: 6px 12px;
    border-radius: 8px;
    margin-right: 14px;
    font-weight: 800;
    font-size: 14px;
}

/* ESTADO SELECIONADO PELO USUÁRIO */
.opcao.selecionada {
    border-color: var(--celeste);
    background: rgba(22, 137, 255, 0.2);
    box-shadow: 0 0 15px rgba(22, 137, 255, 0.3);
}

.opcao.selecionada .letra {
    background: var(--azul-claro);
    color: var(--branco);
}

/* ESTADOS DE RESPOSTA (APÓS CONFIRMAR) */
.opcao.correta {
    border-color: #22c55e !important;
    background: rgba(20, 83, 45, 0.7) !important;
    box-shadow: 0 0 20px rgba(34, 197, 94, 0.4) !important;
}

.opcao.correta .letra {
    background: #16a34a !important;
    color: #ffffff !important;
}

.opcao.errada {
    border-color: #ef4444 !important;
    background: rgba(127, 29, 29, 0.7) !important;
    box-shadow: 0 0 20px rgba(239, 68, 68, 0.4) !important;
}

.opcao.errada .letra {
    background: #dc2626 !important;
    color: #ffffff !important;
}

/* ================================
   BOTÃO CONFIRMAR
================================ */
.confirmar {
    width: 100%;
    min-height: 54px;
    background: linear-gradient(135deg, var(--branco), var(--cinza-claro));
    color: var(--azul-escuro);
    border: none;
    border-radius: 14px;
    font-size: 15px;
    font-weight: 800;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 10px;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.25);
    transition: transform 0.25s ease, box-shadow 0.25s ease, background 0.25s ease;
}

.confirmar span {
    font-size: 18px;
    transition: transform 0.25s ease;
}

.confirmar:disabled {
    background: rgba(255, 255, 255, 0.05);
    color: rgba(255, 255, 255, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.08);
    box-shadow: none;
    cursor: not-allowed;
}

.confirmar:not(:disabled):hover {
    transform: translateY(-3px) scale(1.02);
    box-shadow: 0 12px 30px rgba(77, 184, 255, 0.35);
}

.confirmar:not(:disabled):hover span {
    transform: translateX(5px);
}

/* ================================
   RODAPÉ DO QUIZ
================================ */
footer {
    margin-top: 30px;
    text-align: center;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 20px;
}

footer span {
    color: var(--celeste);
    font-size: 16px;
}

footer p {
    font-size: 13px;
    font-weight: 800;
    color: var(--branco);
    margin: 5px 0 2px;
    letter-spacing: 1px;
}

footer small {
    font-size: 10px;
    color: var(--cinza-texto);
    letter-spacing: 2px;
    font-weight: 700;
}

/* Esconde o input radio nativo feio */
.opcao input[type="radio"] {
    position: absolute;
    opacity: 0;
    cursor: pointer;
}

/* Transforma o label em um botão clicável perfeito */
.opcao {
    display: flex;
    align-items: center;
    background: rgba(255, 255, 255, 0.03);
    border: 2px solid rgba(255, 255, 255, 0.1);
    color: var(--branco);
    padding: 16px;
    border-radius: 14px;
    cursor: pointer;
    font-size: 15px;
    font-weight: 600;
    text-align: left;
    transition: all 0.25s ease;
    user-select: none;
}

.opcao:hover {
    border-color: var(--celeste);
    background: rgba(255, 255, 255, 0.07);
    transform: translateY(-2px);
}

.opcao .letra {
    background: rgba(255, 255, 255, 0.1);
    color: var(--celeste);
    padding: 6px 12px;
    border-radius: 8px;
    margin-right: 14px;
    font-weight: 800;
    font-size: 14px;
}

/* Mágica do CSS: Quando o input DENTRO do label estiver marcado (:checked) */
.opcao input[type="radio"]:checked ~ .letra {
    background: var(--azul-claro);
    color: var(--branco);
}

/* Altera o estilo do card inteiro quando selecionado */
.opcao:has(input[type="radio"]:checked) {
    border-color: var(--celeste);
    background: rgba(22, 137, 255, 0.2);
    box-shadow: 0 0 15px rgba(22, 137, 255, 0.3);
}