/* ============================
   RESET BÁSICO
============================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* ============================
   VARIÁVEIS DE TEMA
============================ */
:root {
    --bg-color: #f5f5f5;
    --text-color: #222;
    --card-bg: #fff;
    --border-color: #ddd;
}

body.dark {
    --bg-color: #121212;
    --text-color: #eee;
    --card-bg: #1e1e1e;
    --border-color: #333;
}

/* ============================
   ESTILOS GERAIS
============================ */
body {
    background: var(--bg-color);
    color: var(--text-color);
    font-family: Arial, Helvetica, sans-serif;
    line-height: 1.5;
    transition: background 0.3s ease, color 0.3s ease;
}

/* ============================
   LINKS
============================ */
a {
    color: inherit;
    text-decoration: none;
}

a:hover {
    opacity: 0.8;
}

/* ============================
   CARDS / CONTAINERS
============================ */
.card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    padding: 20px;
    border-radius: 6px;
    margin-bottom: 20px;
}

/* ============================
   BOTÕES
============================ */
button,
.btn {
    background: #007bff;
    color: #fff;
    border: none;
    padding: 10px 16px;
    border-radius: 4px;
    cursor: pointer;
    transition: opacity 0.2s ease;
}

button:hover,
.btn:hover {
    opacity: 0.85;
}

/* ============================
   INPUTS
============================ */
input,
select,
textarea {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background: var(--card-bg);
    color: var(--text-color);
    margin-bottom: 12px;
}

/* ============================
   LAYOUT CLÁSSICO DO PAINEL
============================ */

.sidebar {
    width: 240px;
    height: 100vh;
    position: fixed;
    top: 0;
    left: 0;
    background: #0d6efd;
    color: #ffffff;
    padding-top: 20px;
    z-index: 1050; /* <<< ISSO É CRÍTICO */
}

.sidebar h4 {
    color: #ffffff;
}

.sidebar a {
    display: block;
    padding: 12px 20px;
    color: #ffffff;
    text-decoration: none;
}

.sidebar a:hover {
    background: rgba(255,255,255,0.2);
}

.sidebar hr {
    border-color: rgba(255,255,255,0.3);
}

.main {
    margin-left: 240px;
    min-height: 100vh;
}

.content {
    padding: 20px;
}

.navbar {
    margin-left: 240px;
}