:root {
    --bg-color: #202123;
    --card-color: #2b2c2f;
    --accent-color: #10a37f;
    --text-color: #ececec;
    --muted-color: #a0a0a0;
}

body {
    font-family: 'Segoe UI', sans-serif;
    margin: 0;
    padding: 0;
    background: var(--bg-color);
    color: var(--text-color);
    display: flex;
    min-height: 100vh;
}

/* Barra lateral */
nav {
    background: var(--card-color);
    width: 220px;
    padding: 1rem;
    position: fixed;
    top: 0;
    left: 0;
    height: 100%;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    box-shadow: 2px 0 5px rgba(0,0,0,0.3);
    transition: transform 0.3s ease;
    z-index: 1000;
}

nav.hidden { transform: translateX(-100%); }

nav h3 {
    color: var(--muted-color);
    font-weight: normal;
    margin-bottom: 1rem;
    border-bottom: 1px solid #444;
    padding-bottom: 0.5rem;
}

nav a {
    color: var(--text-color);
    text-decoration: none;
    padding: 0.5rem;
    border-radius: 6px;
    transition: background 0.3s;
}

nav a:hover {
    background: rgba(255,255,255,0.05);
}

/* Botão hamburger */
#menu-toggle {
    display: none;
    position: fixed;
    top: 15px;
    left: 15px;
    background: var(--card-color);
    border: none;
    padding: 10px;
    border-radius: 6px;
    color: var(--text-color);
    font-size: 1.5rem;
    cursor: pointer;
    z-index: 1100;
}

/* Conteúdo principal */
main {
    flex: 1;
    padding: 2rem;
    margin-left: 220px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    transition: margin-left 0.3s ease;
}

h2, p {
    text-align: center;
}

.login-box {
    background: var(--card-color);
    padding: 1.5rem;
    border-radius: 10px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.2);
    width: 100%;
    max-width: 320px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.login-box input {
    width: 100%;
    padding: 0.8rem;
    margin: 0.5rem 0;
    border: 1px solid #444;
    border-radius: 8px;
    background: #1e1f21;
    color: var(--text-color);
}

.btn {
    background: var(--accent-color);
    color: white;
    border: none;
    padding: 0.8rem 1.5rem;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1rem;
    transition: background 0.3s;
    margin-top: 0.5rem;
}

.btn:hover {
    background: #0e8c6e;
}

#msgErro {
    color: #f44336;
    margin-top: 0.5rem;
    font-size: 0.9rem;
    text-align: center;
}

footer {
    text-align: center;
    padding: 1rem;
    font-size: 0.85rem;
    color: var(--muted-color);
    margin-top: 2rem;
}

/* Mobile */
@media screen and (max-width: 768px) {
    nav {
        transform: translateX(-100%);
        position: fixed;
        top: 0;
        left: 0;
    }
    nav.show {
        transform: translateX(0);
    }
    #menu-toggle {
        display: block;
    }
    main {
        margin-left: 0;
        padding: 1rem;
    }
}