/* ==========================================================================
   VARIÁVEIS GLOBAIS (Tema Claro - Alto Contraste)
   ========================================================================== */
:root {
    --bg-color: #ffffff;
    --text-color: #000000;
    --text-secondary: #404040;
    --card-bg: #f4f4f4;
    --border-color: #d1d1d1;
    --accent-color: #000000;
    --header-bg: rgba(255, 255, 255, 0.95);
    --input-bg: #ffffff;
    --input-border: #888888;
    --shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
    --code-bg: #1e1e1e;
}

/* TEMA ESCURO */
body.dark-mode {
    --bg-color: #0a0a0a;
    --text-color: #ffffff;
    --text-secondary: #b0b0b0;
    --card-bg: #1a1a1a;
    --border-color: #333333;
    --accent-color: #ffffff;
    --header-bg: rgba(10, 10, 10, 0.95);
    --input-bg: #222222;
    --input-border: #555555;
    --shadow: 0 4px 10px rgba(0, 0, 0, 0.5);
    --code-bg: #000000;
}

/* ==========================================================================
   ESTRUTURA BASE
   ========================================================================== */
body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: 'Inter', 'Segoe UI', sans-serif;
    margin: 0;
    padding: 0;
    transition: background-color 0.3s ease, color 0.3s ease;
    line-height: 1.6;
}

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
    padding: 0;
}

/* ==========================================================================
   HEADER PADRÃO
   ========================================================================== */
.main-header {
    position: sticky;
    top: 0;
    background-color: var(--header-bg);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    padding: 1rem 0;
}

.header-container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 20px;
}

.logo {
    font-size: 1.4rem;
    font-weight: 800;
    letter-spacing: -0.5px;
    color: var(--text-color);
    text-transform: uppercase;
}

.nav-menu {
    display: flex;
    gap: 25px;
    align-items: center;
}

.nav-link {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: color 0.2s;
}

.nav-link:hover, .nav-link.active {
    color: var(--text-color);
    font-weight: 700;
}

/* Botão de Tema */
.theme-btn {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-color);
    width: 36px;
    height: 36px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}

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

/* ==========================================================================
   BARRA DE PESQUISA (HEADER)
   ========================================================================== */
.header-search {
    position: relative;
    display: flex;
    align-items: center;
    margin-left: auto;
}

.search-input {
    padding: 8px 35px 8px 15px;
    border: 1px solid var(--border-color);
    border-radius: 20px;
    background-color: var(--bg-color);
    color: var(--text-color);
    font-size: 0.9rem;
    width: 200px;
    transition: all 0.3s;
}

.search-input:focus {
    width: 280px;
    outline: none;
    border-color: var(--text-color);
}

.search-icon {
    position: absolute;
    right: 12px;
    color: var(--text-secondary);
    pointer-events: none;
    font-size: 0.9rem;
}

/* ==========================================================================
   INPUTS E FORMULÁRIOS GERAIS
   ========================================================================== */
input:not(.search-input), select, textarea {
    background-color: var(--input-bg);
    color: var(--text-color);
    border: 1px solid var(--input-border);
    padding: 10px 12px;
    border-radius: 6px;
    font-size: 1rem;
    width: 100%;
    box-sizing: border-box;
    transition: border-color 0.3s;
}

input:focus, select:focus, textarea:focus {
    outline: none;
    border-color: var(--text-color);
    box-shadow: 0 0 0 2px rgba(128, 128, 128, 0.2);
}

/* ==========================================================================
   BOTÕES GERAIS
   ========================================================================== */
.btn {
    background-color: var(--text-color);
    color: var(--bg-color);
    padding: 10px 20px;
    border-radius: 6px;
    font-weight: 600;
    border: 1px solid var(--text-color);
    cursor: pointer;
    transition: all 0.2s;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
}

.btn:hover {
    background-color: transparent;
    color: var(--text-color);
}

/* ==========================================================================
   BLOCOS DE CÓDIGO
   ========================================================================== */
pre {
    background-color: var(--code-bg);
    color: #d4d4d4;
    padding: 15px;
    border-radius: 8px;
    overflow-x: auto;
    position: relative;
    margin: 20px 0;
    border: 1px solid var(--border-color);
}

pre.collapsed {
    max-height: 150px;
    overflow-y: hidden;
}

pre.collapsed::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 60px;
    background: linear-gradient(to bottom, transparent, var(--code-bg));
    pointer-events: none;
}

.btn-expand-code {
    display: block;
    width: 100%;
    background-color: var(--card-bg);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    border-top: none;
    padding: 8px;
    text-align: center;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    border-radius: 0 0 8px 8px;
    margin-top: -20px;
    margin-bottom: 20px;
    transition: background 0.2s;
}

.btn-expand-code:hover {
    background-color: var(--border-color);
}

/* ==========================================================================
   LIGHTBOX E IMAGENS
   ========================================================================== */
.lightbox-modal {
    display: none;
    position: fixed;
    z-index: 2000;
    padding-top: 50px;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0, 0, 0, 0.9);
    backdrop-filter: blur(5px);
}

.lightbox-content {
    margin: auto;
    display: block;
    max-width: 90%;
    max-height: 90vh;
    border-radius: 8px;
    box-shadow: 0 0 20px rgba(255, 255, 255, 0.2);
    animation: zoomIn 0.3s;
}

@keyframes zoomIn {
    from {transform: scale(0.8); opacity: 0;}
    to {transform: scale(1); opacity: 1;}
}

.lightbox-close {
    position: absolute;
    top: 20px;
    right: 35px;
    color: #f1f1f1;
    font-size: 40px;
    font-weight: bold;
    transition: 0.3s;
    cursor: pointer;
}

.lightbox-close:hover,
.lightbox-close:focus {
    color: #bbb;
    text-decoration: none;
    cursor: pointer;
}

/* Estilo para imagens dentro dos artigos */
.img-container {
    text-align: center;
    margin: 2rem 0;
}

.img-artigo {
    max-width: 100%;
    width: auto;
    height: auto;
    max-height: 450px; /* Limita altura */
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    border: 1px solid var(--border-color);
    display: block;
    margin: 0 auto;
    cursor: zoom-in;
    transition: transform 0.2s;
}

.img-artigo:hover {
    transform: scale(1.01);
}

.img-legenda {
    font-family: 'Inter', sans-serif;
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-top: 0.5rem;
    font-style: italic;
}

.card-img {
    cursor: pointer;
    transition: transform 0.2s;
}

/* Responsivo */
@media (max-width: 600px) {
    .header-container {
        flex-direction: column;
        gap: 15px;
    }
    .lightbox-content {
        width: 100%;
    }
    .search-input:focus {
        width: 100%;
    }
}