:root {
    --primary-color: #0071e3; 
    --secondary-color: #6e6e73; 
    --light-bg: #f5f5f7; 
    --content-bg: #ffffff; 
    --text-color: #1d1d1f; 
    --text-color-light: #f5f5f7; 
    --border-color: #d2d2d7; 
    --success-color: #34c759; 
    --warning-color: #ffcc00; 
    --danger-color: #ff3b30; 
    --hover-color: #005bb5; 
    --zebra-stripe-color: #f9f9f9; 
    --font-family-base: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif; 
    --white-color: #FFFFFF; 
    --black-color: #1d1d1f; 

    --btn-primary-bg: var(--primary-color);
    --btn-primary-text: var(--white-color);
    --btn-primary-hover-bg: var(--hover-color);
    --btn-secondary-bg: #6e7d8b;
    --btn-secondary-text: var(--white-color);
    --btn-secondary-hover-bg: #5a6268;
    --btn-light-bg: #e9ecef;
    --btn-light-text: #343a40;
    --btn-light-border: #ced4da;
    --btn-light-hover-bg: #d3d9df;
    --btn-light-hover-text: #343a40;
    --btn-light-hover-border: #b9c2ca;
    
    /* Tokens para Cards */
    --cp-radius: 12px;
    --cp-shadow: 0 4px 12px rgba(0,0,0,.06);
    --cp-shadow-hover: 0 8px 24px rgba(0,0,0,.10);
}

body.dark-mode {
    --primary-color: #0a84ff; 
    --secondary-color: #8e8e93; 
    --light-bg: #000000; 
    --content-bg: #1c1c1e; 
    --text-color: #f5f5f7; 
    --text-color-light: #1d1d1f; 
    --border-color: #3a3a3c; 
    --success-color: #30d158; 
    --warning-color: #ffd60a; 
    --danger-color: #ff453a; 
    --hover-color: #0b63f6; 
    --zebra-stripe-color: #2c2c2e; 

    --btn-primary-bg: var(--primary-color);
    --btn-primary-text: var(--white-color);
    --btn-primary-hover-bg: var(--hover-color);
    --btn-secondary-bg: #58585a;
    --btn-secondary-text: var(--white-color);
    --btn-secondary-hover-bg: #6e6e73;
    --btn-light-bg: #3a3a3c;
    --btn-light-text: #f5f5f7;
    --btn-light-border: #545458;
    --btn-light-hover-bg: #4a4a4e;
    --btn-light-hover-text: #f5f5f7;
    --btn-light-hover-border: #6a6a6e;
    
    --cp-shadow: 0 6px 22px rgba(0,0,0,.35);
    --cp-shadow-hover: 0 12px 36px rgba(0,0,0,.55);
}

html { 
    scroll-behavior: smooth; 
}

body { 
    font-family: var(--font-family-base); 
    line-height: 1.6; 
    margin: 0; 
    padding: 0; 
    background-color: var(--light-bg); 
    color: var(--text-color); 
    font-size: 16px; 
    transition: background-color 0.3s, color 0.3s; 
}

.container { 
    max-width: 800px; 
    margin: 20px auto; 
    padding: 25px; 
    background-color: var(--content-bg); 
    box-shadow: var(--cp-shadow); 
    border-radius: 12px; 
    transition: background-color 0.3s; 
    border: 1px solid var(--border-color); 
}

/* --- HEADER FIXO E NAVEGAÇÃO --- */
.site-header-fixed {
    background-color: var(--content-bg);
    border-bottom: 1px solid var(--border-color);
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 10002;
    transition: background-color 0.3s, border-color 0.3s;
}

body.dark-mode .site-header-fixed {
    box-shadow: 0 2px 5px rgba(0,0,0,0.2);
}

.header-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 60px;
}

.header-spacer {
    height: 60px;
}

.header-logo-link {
    text-decoration: none;
    display: inline-block; 
    line-height: 0; 
}

.header-logo {
    height: 32px; 
    width: auto; 
    vertical-align: middle; 
}

/* Controle de Logotipo Claro/Escuro */
.logo-dark { display: none; }
body.dark-mode .logo-light { display: none; }
body.dark-mode .logo-dark { display: inline-block; }

.main-nav .nav-list {
    margin: 0;
    padding: 0;
    list-style: none;
    display: flex;
    align-items: center;
    gap: 5px;
}

.main-nav .nav-link {
    display: flex;
    align-items: center;
    padding: 8px 16px;
    color: var(--secondary-color);
    text-decoration: none;
    font-weight: 500;
    border-radius: 6px;
    transition: background-color 0.2s, color 0.2s;
    white-space: nowrap;
}

.main-nav .nav-link:hover {
    background-color: var(--light-bg);
    color: var(--primary-color);
}

.main-nav .nav-link.active {
    background-color: var(--primary-color);
    color: var(--white-color);
    font-weight: 600;
}

/* Item Mobile (Escondido no Desktop) */
.nav-item-mobile-action {
    display: none;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 10px;
}

.theme-toggle-button {
    background-color: var(--btn-light-bg);
    color: var(--btn-light-text);
    border: 1px solid var(--btn-light-border);
    padding: 7px;
    width: 38px;
    height: 38px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 1.1em;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.theme-toggle-button:hover { 
    background-color: var(--btn-light-hover-bg); 
    border-color: var(--btn-light-hover-border); 
}

.hamburger-button {
    display: none;
    font-size: 1.8em;
    background: none;
    border: none;
    color: var(--text-color);
    cursor: pointer;
    padding: 0 5px;
    position: relative;
    z-index: 20005; 
}

/* --- TABS NAVIGATION (ESTILO DAS ABAS) --- */
.tabs-navigation {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-bottom: 30px;
    flex-wrap: wrap;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 20px;
}

.tab-btn {
    background: transparent;
    border: 1px solid transparent;
    padding: 10px 20px;
    cursor: pointer;
    font-size: 0.95em;
    font-weight: 500;
    color: var(--secondary-color);
    border-radius: 25px;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 8px;
}

.tab-btn:hover {
    background-color: var(--light-bg);
    color: var(--primary-color);
}

.tab-btn.active {
    background-color: var(--primary-color);
    color: #fff;
    box-shadow: 0 4px 10px rgba(0, 113, 227, 0.2);
}

.tab-btn .icon {
    font-size: 1.2em;
    display: flex;
}

/* --- CONTROLE DE VISIBILIDADE DAS SEÇÕES (Abas) --- */
.calculator-section {
    display: none; /* Esconde todas por padrão */
    animation: fadeIn 0.3s ease;
}

.calculator-section.active {
    display: block; /* Mostra apenas a ativa */
}

/* --- ESTILOS GERAIS DE COMPONENTES --- */
.section-title-modern {
    margin-bottom: 15px;
    color: var(--primary-color);
    font-weight: 600;
    font-size: 1.4em;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 10px;
}

/* Botões */
.btn { 
    display: inline-block; 
    background-color: var(--btn-primary-bg); 
    color: var(--btn-primary-text); 
    padding: 12px 25px; 
    border: none; 
    border-radius: 6px; 
    cursor: pointer; 
    font-size: 1em; 
    transition: background-color 0.2s ease, transform 0.1s ease; 
    text-align: center; 
    font-weight: 500; 
    text-decoration: none;
}

.btn:hover { 
    background-color: var(--btn-primary-hover-bg); 
    transform: translateY(-1px); 
}

.btn-secondary { 
    background-color: var(--btn-secondary-bg); 
    color: var(--btn-secondary-text); 
}

.btn-secondary:hover { 
    background-color: var(--btn-secondary-hover-bg); 
}

.btn-small { 
    padding: 6px 12px; 
    font-size: 0.9em; 
}

.btn-light {
    background-color: var(--btn-light-bg);
    color: var(--btn-light-text);
    border: 1px solid var(--btn-light-border);
}

.btn-light:hover {
    background-color: var(--btn-light-hover-bg);
}

.btn-danger { 
    background-color: var(--danger-color); 
    color: var(--white-color); 
}

.btn-danger:hover { 
    background-color: #d63027; 
}

/* Formulários */
.form-group { 
    margin-bottom: 15px; 
}

.form-group label { 
    display: block; 
    margin-bottom: 6px; 
    font-weight: 500; 
    font-size: 0.95em; 
    color: var(--text-color); 
}

.form-group input[type="date"], 
.form-group input[type="number"], 
.form-group input[type="text"] { 
    width: 100%; 
    padding: 10px 15px; 
    border: 1px solid var(--border-color); 
    border-radius: 8px; 
    box-sizing: border-box; 
    font-size: 1em; 
    background-color: var(--content-bg); 
    color: var(--text-color); 
    transition: border-color 0.2s, box-shadow 0.2s; 
}

body.dark-mode .form-group input { 
    background-color: #3a3a3c; 
    border-color: #545458;
}

.form-group input:focus { 
    border-color: var(--primary-color); 
    box-shadow: 0 0 0 3px rgba(0, 113, 227, 0.25); 
    outline: none; 
}

/* Breadcrumb */
.breadcrumb {
    font-size: 0.85em;
    margin-bottom: 20px;
    padding: 10px 15px;
    background-color: var(--light-bg);
    border-radius: 6px;
}

.breadcrumb ol {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    align-items: center;
    flex-wrap: wrap;
}

.breadcrumb li {
    display: flex;
    align-items: center;
}

.breadcrumb li a {
    color: var(--primary-color);
    text-decoration: none;
}

.breadcrumb li + li::before {
    content: '›';
    margin: 0 10px;
    color: var(--secondary-color);
    font-size: 1.2em;
    line-height: 1;
}

/* --- FOOTER --- */
footer {
    margin-top: 40px;
    padding-top: 30px;
    padding-bottom: 30px;
    border-top: 1px solid var(--border-color);
    background-color: var(--content-bg);
}

.footer-content {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 20px;
    text-align: center;
    font-size: 0.9em; 
    color: var(--secondary-color);
}

.footer-logo-container {
    margin-bottom: 20px;
}

.footer-logo {
    height: 35px;
    width: auto;
}

.footer-links button {
    background: none; 
    border: none; 
    color: var(--primary-color); 
    cursor: pointer; 
    padding: 0; 
    font-size: 1em; 
}

.footer-links button:hover { 
    text-decoration: underline; 
}

/* --- MODAIS --- */
.modal {
    display: none; 
    position: fixed; 
    z-index: 10000; 
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto; 
    background-color: rgba(0,0,0,0.5); 
    backdrop-filter: blur(2px);
    animation: fadeIn 0.3s;
}

.modal-content {
    background-color: var(--content-bg);
    margin: 10% auto;
    padding: 30px;
    border: 1px solid var(--border-color);
    width: 90%;
    max-width: 600px;
    border-radius: 12px;
    position: relative;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    animation: slideIn 0.3s;
}

.modal-content h2 {
    margin-top: 0;
    margin-bottom: 20px;
    color: var(--primary-color);
    font-size: 1.5em;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 10px;
}

.close-button {
    color: var(--secondary-color);
    position: absolute;
    top: 15px;
    right: 20px;
    font-size: 24px;
    background: none;
    border: none;
    cursor: pointer;
    transition: color 0.2s;
}

.close-button:hover {
    color: var(--danger-color);
}

/* --- CARDS DE FERRAMENTAS (HOME) --- */
.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
    margin: 30px 0;
}

.tool-card {
    display: flex;
    align-items: center;
    background: var(--content-bg);
    padding: 20px;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    text-decoration: none;
    color: var(--text-color);
    transition: all 0.2s ease;
    box-shadow: 0 2px 5px rgba(0,0,0,0.03);
}

.tool-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--cp-shadow-hover);
    border-color: var(--primary-color);
}

.tool-icon {
    font-size: 2em;
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 10px;
    background-color: var(--light-bg);
    color: var(--primary-color);
    margin-right: 15px;
    flex-shrink: 0;
}

.tool-info {
    flex: 1;
}

.tool-title {
    font-weight: 600;
    font-size: 1.1em;
    display: block;
    margin-bottom: 4px;
}

.tool-desc {
    font-size: 0.9em;
    color: var(--secondary-color);
    line-height: 1.3;
}

/* --- ESTILOS DE ARTIGO/TEXTO --- */
.article-content {
    margin-top: 40px;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
}

.article-content h2 {
    font-size: 1.6em;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.article-content h3 {
    font-size: 1.3em;
    margin-top: 30px;
    margin-bottom: 15px;
    font-weight: 600;
}

.article-content p {
    margin-bottom: 15px;
    font-size: 1.05em;
    line-height: 1.7;
}

/* --- ANIMAÇÕES --- */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideIn {
    from { transform: translateY(-20px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

/* --- RESPONSIVIDADE DO MENU MOBILE --- */
@media (max-width: 920px) {
    .header-container {
        justify-content: space-between;
    }

    .hamburger-button {
        display: block;
    }

    .header-actions .theme-toggle-button {
        display: none; /* Esconde no topo, mostra no menu */
    }

    /* Menu Gaveta */
    .main-nav {
        display: block;
        position: fixed;
        top: 60px;
        right: 0;
        bottom: 0;
        width: 280px;
        background-color: var(--content-bg);
        z-index: 20000;
        transform: translateX(100%);
        transition: transform 0.3s ease, visibility 0s linear 0.3s;
        border-left: 1px solid var(--border-color);
        box-shadow: -5px 0 15px rgba(0,0,0,0.1);
        visibility: hidden;
    }

    .main-nav.is-open {
        transform: translateX(0);
        visibility: visible;
        transition: transform 0.3s ease, visibility 0s linear 0s;
    }

    .main-nav .nav-list {
        flex-direction: column;
        align-items: stretch;
        padding: 0;
    }

    .main-nav .nav-link {
        padding: 15px 20px;
        border-bottom: 1px solid var(--border-color);
        border-radius: 0;
        font-size: 1.05em;
    }

    /* Botão Mobile Visível Apenas Aqui */
    .nav-item-mobile-action {
        display: block; 
        padding: 15px 20px;
        margin-top: auto; 
    }

    .nav-action-button {
        width: 100%;
        text-align: left;
        padding: 12px 15px;
        background-color: var(--light-bg);
        border: 1px solid var(--border-color);
        border-radius: 8px;
        color: var(--text-color);
        font-weight: 500;
        display: flex;
        align-items: center;
        gap: 10px;
        cursor: pointer;
    }
}

@media (max-width: 768px) {
    .container {
        margin: 0;
        max-width: 100%;
        border-radius: 0;
        border: none;
        box-shadow: none;
    }
    
    .tools-grid {
        grid-template-columns: 1fr;
    }
    
    .tabs-navigation {
        overflow-x: auto;
        justify-content: flex-start;
        padding-bottom: 10px;
        -webkit-overflow-scrolling: touch;
    }
    
    .tab-btn {
        flex-shrink: 0;
    }
}

/* Impressão */
@media print {
    .site-header-fixed, .header-spacer, footer, .tabs-navigation, .calculator-section, .breadcrumb {
        display: none !important;
    }
    /* Mostra a secção ativa para imprimir o resultado se houver */
    .calculator-section.active {
        display: block !important;
    }
    .container {
        border: none;
        box-shadow: none;
        max-width: 100%;
        padding: 0;
        margin: 0;
    }
    body {
        background-color: #fff;
        color: #000;
    }
}