/* ===== SISTEMA DE TEMAS COM VARIÁVEIS CSS (Refatorado) ===== */
:root {
    /* 1. Definição de Variáveis CSS (Dark Mode Padrão) */
    /* Cores principais baseadas na solicitação do usuário */
    --color-bg-primary: #181822;         /* Fundo Principal */
    --color-bg-secondary: #262635;       /* Fundo Secundário (Containers/Cards) */
    --color-accent: #7A4CFF;             /* Cor de Destaque (Brand/CTAs) */
    --color-text-primary: #C8C8D0;       /* Cor do Texto Principal */
    --color-text-high: #FFFFFF;          /* Cor do Texto de Alto Contraste (H1) */

    /* Variáveis Adaptadas para Novo Tema */
    --text-secondary: #8B949E;           /* Manter o cinza secundário do tema original */
    --text-muted: #6E7681;               /* Manter o texto mudo */
    --action-color: #E63946;             /* Cor de Ação (usada em botões e barras de força) */
    
    /* Border e Shadow derivados do novo accent */
    --border-color: rgba(122, 76, 255, 0.2);     /* 7A4CFF com transparência */
    --border-hover: rgba(122, 76, 255, 0.4);
    --shadow-light: 0 4px 20px rgba(122, 76, 255, 0.1);
    --shadow-dark: 0 8px 32px rgba(0, 0, 0, 0.5);

    /* Gradientes derivados das novas cores primárias/secundárias */
    --gradient-primary: linear-gradient(135deg, var(--color-accent), var(--action-color));
    --gradient-bg: linear-gradient(135deg, var(--color-bg-primary), var(--color-bg-secondary));
    
    /* Outras constantes */
    --border-radius: 12px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 2. Implementação do Light Mode (Classe .light-mode) */
body.light-mode {
    --color-bg-primary: #FFFFFF;        /* Fundo Principal (Branco) */
    --color-bg-secondary: #F0F0F0;      /* Fundo Containers/Cards (Cinza claro) */
    --color-accent: #7A4CFF;            /* Destaque (Consistente) */
    --color-text-primary: #333333;      /* Texto Principal (Cinza escuro legível) */
    --color-text-high: #000000;         /* Texto Alto Contraste (Preto) */

    /* Variáveis Adaptadas para Light Mode */
    --text-secondary: #6C757D;
    --text-muted: #ADB5BD;
    --border-color: rgba(122, 76, 255, 0.3);
    --border-hover: rgba(122, 76, 255, 0.6);
    --shadow-light: 0 4px 20px rgba(0, 0, 0, 0.1);
    --shadow-dark: 0 8px 32px rgba(0, 0, 0, 0.15);
    --gradient-bg: linear-gradient(135deg, var(--color-bg-primary), var(--color-bg-secondary));
}

/* Reset básico */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* 3. Transições suaves para mudança de tema (Aplicado a cores) */
*,
*::before,
*::after {
    /* Adiciona a transição suave para as propriedades de cor/fundo/sombra */
    transition: background-color 0.3s ease,
                color 0.3s ease,
                border-color 0.3s ease,
                box-shadow 0.3s ease;
}

/* Body e configurações globais */
body {
    font-family: 'Inter', sans-serif;
    background: var(--gradient-bg);
    color: var(--color-text-primary); /* Usando a nova variável */
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    position: relative;
    overflow-x: hidden;
}

/* Efeito de fundo com partículas (cores adaptadas ao novo accent) */
body::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    /* Usando o novo --color-accent na transparência */
    background: radial-gradient(circle at 20% 50%, rgba(122, 76, 255, 0.1) 0%, transparent 50%),
                radial-gradient(circle at 80% 20%, rgba(230, 57, 70, 0.1) 0%, transparent 50%);
    z-index: -1;
}

/* ===== TOGGLE DE TEMA (Refatorado para ser um ícone flutuante) ===== */
.theme-toggle {
    position: fixed;
    top: 20px;
    left: 20px;
    width: 50px;
    height: 50px;
    background: none; /* Remove o fundo */
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 1001;
    /* Remove shadow e usa a cor do texto primário como cor do ícone padrão */
    color: var(--color-text-primary);
    transition: var(--transition);
}

.theme-toggle:hover {
    transform: scale(1.1);
    color: var(--color-accent); /* Efeito de hover */
    /* Remove box-shadow */
}

/* Sobrescrita da cor do ícone no Light Mode */
body.light-mode .theme-toggle {
    color: var(--color-text-high); /* Cor de alto contraste no Light Mode (preto) */
}

.theme-toggle i {
    font-size: 24px; /* Aumentado para melhor visualização sem fundo */
    transition: all 0.3s ease;
}

.theme-toggle.rotating i {
    transform: rotate(180deg);
}

/* ===== LINK VOLTAR ===== */
.back-link {
    position: fixed;
    top: 20px;
    right: 20px;
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 20px;
    background: var(--color-bg-secondary); /* Usando nova variável */
    border: 1px solid var(--border-color);
    border-radius: 25px;
    color: var(--color-text-primary); /* Usando nova variável */
    text-decoration: none;
    font-weight: 500;
    font-size: 14px;
    transition: var(--transition);
    z-index: 1000;
}

.back-link:hover {
    background: var(--color-bg-secondary); /* Usando nova variável */
    border-color: var(--color-accent);
    color: var(--color-accent);
    transform: translateY(-2px);
}

/* ===== WRAPPER PRINCIPAL ===== */
.auth-wrapper {
    width: 100%;
    max-width: 450px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 30px;
    z-index: 2;
}

/* ===== LOGO ===== */
.auth-logo {
    text-align: center;
    margin-bottom: 20px;
}

.logo-text {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--color-text-high); /* Usando alto contraste para o título */
    margin-bottom: 5px;
}

.logo-text .stack {
    color: var(--color-accent);
}

.logo-subtitle {
    color: var(--text-secondary);
    font-size: 1rem;
    font-weight: 400;
}

/* ===== CONTAINER DE AUTENTICAÇÃO ===== */
.auth-container {
    width: 100%;
    background: var(--color-bg-secondary); /* Usando nova variável */
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-dark);
    padding: 40px;
    position: relative;
    overflow: hidden;
}

.auth-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
}

/* ===== FORMULÁRIOS ===== */
.auth-form {
    opacity: 0;
    transition: opacity 0.4s ease-in-out;
    pointer-events: none;
}

.auth-form.active {
    opacity: 1;
    pointer-events: all;
}

.form-header {
    text-align: center;
    margin-bottom: 30px;
}

.form-header h2 {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--color-text-high); /* Usando alto contraste para os cabeçalhos */
    margin-bottom: 8px;
}

.form-header p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* ===== GRUPOS DE FORMULÁRIO ===== */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--color-text-primary); /* Usando nova variável */
    font-weight: 500;
    font-size: 0.9rem;
    margin-bottom: 8px;
}

.form-group label i {
    color: var(--color-accent);
    width: 16px;
}

/* ===== INPUTS ===== */
.form-group input {
    width: 100%;
    padding: 12px 16px;
    background: var(--color-bg-primary); /* Usando nova variável, levemente mais escuro que o secundário */
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    color: var(--color-text-primary); /* Usando nova variável */
    font-family: inherit;
    font-size: 0.95rem;
    transition: var(--transition);
}

.form-group input::placeholder {
    color: var(--text-muted);
}

.form-group input:focus {
    outline: none;
    border-color: var(--color-accent);
    background: var(--color-bg-primary); /* Mantém o fundo, mas usa a cor primária */
    box-shadow: 0 0 0 3px rgba(122, 76, 255, 0.1);
}

/* ===== INPUT DE SENHA COM TOGGLE ===== */
.password-input {
    position: relative;
}

.password-input input {
    padding-right: 50px;
}

.toggle-password {
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 5px;
    transition: var(--transition);
}

.toggle-password:hover {
    color: var(--color-accent);
}

/* ===== FORÇA DA SENHA ===== */
.password-strength {
    margin-top: 8px;
}

.strength-bar {
    width: 100%;
    height: 4px;
    background: var(--border-color);
    border-radius: 2px;
    overflow: hidden;
    margin-bottom: 5px;
}

.strength-fill {
    height: 100%;
    width: 0%;
    background: var(--action-color);
    transition: all 0.3s ease;
    border-radius: 2px;
}

.strength-text {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* Classes para diferentes níveis de força */
.strength-weak .strength-fill {
    width: 25%;
    background: var(--action-color);
}

.strength-fair .strength-fill {
    width: 50%;
    background: #FFA500;
}

.strength-good .strength-fill {
    width: 75%;
    background: #32CD32;
}

.strength-strong .strength-fill {
    width: 100%;
    background: #228B22;
}

/* ===== CHECKBOX PERSONALIZADO ===== */
.checkbox-container {
    display: flex !important;
    align-items: center !important;
    gap: 12px !important;
    cursor: pointer;
    font-size: 0.9rem !important;
    color: var(--text-secondary) !important;
    font-weight: 400 !important;
}

.checkbox-container input {
    display: none;
}

.checkmark {
    background: var(--color-bg-primary); /* Usando primário para caixa de seleção */
    border: 2px solid var(--border-color);
    border-radius: 4px;
    position: relative;
    transition: var(--transition);
    flex-shrink: 0;
    width: 18px;
    height: 18px;
}

.checkbox-container input:checked + .checkmark {
    background: var(--color-accent);
    border-color: var(--color-accent);
}

.checkmark::after {
    content: '';
    position: absolute;
    left: 5px;
    top: 2px;
    width: 4px;
    height: 8px;
    border: solid white;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
    opacity: 0;
    transition: opacity 0.2s ease;
}

.checkbox-container input:checked + .checkmark::after {
    opacity: 1;
}

/* ===== OPÇÕES DO FORMULÁRIO ===== */
.form-options {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 25px;
    flex-wrap: wrap;
    gap: 10px;
}

.forgot-password {
    color: var(--color-accent);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: var(--transition);
}

.forgot-password:hover {
    color: var(--action-color);
}

/* ===== BOTÕES ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    border: none;
    border-radius: var(--border-radius);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    font-family: inherit;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white; /* Cor branca forçada para contraste no gradiente */
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-light);
}

.btn-google {
    background: var(--color-bg-secondary); /* Usando nova variável */
    color: var(--color-text-primary); /* Usando nova variável */
    border: 2px solid var(--border-color);
}

.btn-google:hover {
    background: var(--color-bg-primary); /* Usando primário no hover para contraste */
    border-color: var(--border-hover);
    transform: translateY(-1px);
}

.btn-full {
    width: 100%;
}

/* ===== DIVISOR ===== */
.divider {
    display: flex;
    align-items: center;
    margin: 25px 0;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.divider::before,
.divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--border-color);
}

.divider span {
    padding: 0 15px;
}

/* ===== FOOTER DO FORMULÁRIO ===== */
.form-footer {
    text-align: center;
    margin-top: 25px;
}

.form-footer p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.form-footer a,
.terms-link,
.privacy-link {
    color: var(--color-accent);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
}

.form-footer a:hover,
.terms-link:hover,
.privacy-link:hover {
    color: var(--action-color);
}

/* ===== BENEFÍCIOS ===== */
.auth-benefits {
    display: flex;
    flex-direction: column;
    gap: 15px;
    margin-top: 20px;
}

.benefit-item {
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--color-text-primary); /* Usando nova variável */
    font-size: 0.9rem;
}

.benefit-item i {
    color: var(--color-accent);
    width: 20px;
    text-align: center;
}

/* ===== RESPONSIVIDADE ===== */
@media (max-width: 768px) {
    body {
        padding: 15px;
    }

    .theme-toggle,
    .back-link {
        top: 15px;
    }

    .theme-toggle {
        left: 15px;
        width: 45px;
        height: 45px;
    }

    .back-link {
        right: 15px;
        padding: 10px 16px;
        font-size: 13px;
    }

    .auth-wrapper {
        max-width: 100%;
        gap: 20px;
    }

    .auth-container {
        padding: 30px 25px;
    }

    .logo-text {
        font-size: 2rem;
    }

    .form-header h2 {
        font-size: 1.5rem;
    }

    .form-options {
        flex-direction: column;
        align-items: flex-start;
        gap: 15px;
    }

    .auth-benefits {
        display: none;
    }
}

@media (max-width: 480px) {
    .auth-container {
        padding: 25px 20px;
    }

    .logo-text {
        font-size: 1.8rem;
    }

    .form-header h2 {
        font-size: 1.4rem;
    }

    .back-link span {
        display: none;
    }
}

/* ===== ANIMAÇÕES PERSONALIZADAS ===== */
@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideInDown {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.auth-container {
    animation: slideInUp 0.6s ease-out;
}

.auth-logo {
    animation: slideInDown 0.6s ease-out;
}

/* ===== ESTADOS DE LOADING ===== */
.btn.loading {
    pointer-events: none;
    position: relative;
}

.btn.loading::after {
    content: '';
    position: absolute;
    width: 16px;
    height: 16px;
    border: 2px solid transparent;
    border-top: 2px solid currentColor;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.btn.loading i {
    opacity: 0;
}