.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    z-index: 5000;
    transition: transform 0.3s ease-in-out;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 45px 0 30px; /* margem direita 45px, esquerda 30px */
    height: 60px;
    box-sizing: border-box;
}

.header.collapsed {
    transform: translateY(-100%);
}
        /* Botão de expansão */
        #expand-button {
            position: fixed;
            top: -20px;
            left: 50%;
            transform: translateX(-50%);
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            border: none;
            border-radius: 50%;
            width: 50px;
            height: 50px;
            cursor: pointer;
            z-index: 1001;
            box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
            transition: all 0.3s ease;
            opacity: 0;
            visibility: hidden;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
        }
        /* Quando o botão está visível */
        #expand-button.visible {
            opacity: 1;
            visibility: visible;
        }
        /* Efeito hover no botão */
        #expand-button:hover {
            transform: translateX(-50%) scale(1.1);
            box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
        }
        /* Seta para cima */
        .arrow-up {
            width: 0;
            height: 0;
            border-left: 8px solid transparent;
            border-right: 8px solid transparent;
            border-bottom: 12px solid white;
        }
        /* Animação de pulse para chamar atenção */
        @keyframes pulse {
            0% { transform: translateX(-50%) scale(1); }
            50% { transform: translateX(-50%) scale(1.05); }
            100% { transform: translateX(-50%) scale(1); }
        }
/* Esconde os containers antigos */
.header-top,
.header-bottom {
    display: none !important;
}

/* Search box */
.search-container {
    position: relative;
    width: 250px;
    margin-right: 15px;
}

.search-box {
    width: 100%;
    padding: 6px 36px 6px 12px;
    border: 2px solid rgba(255,255,255,0.2);
    border-radius: 20px;
    background: rgba(255,255,255,0.1);
    color: white;
    font-size: 14px;
}

.search-box::placeholder {
    color: rgba(255,255,255,0.7);
}

.search-icon {
    position: absolute;
    right: 10px;
    top: 50%;
    transform: translateY(-50%);
    color: rgba(255,255,255,0.7);
}

/* Font controls */
.font-controls {
    display: flex;
    gap: 6px;
    margin-right: 15px;
}

.font-btn {
    background: rgba(255,255,255,0.1);
    border: 1px solid rgba(255,255,255,0.2);
    color: white;
    width: 30px;
    height: 30px;
    border-radius: 50%;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.font-btn:hover {
    background: rgba(255,255,255,0.2);
}

/* Botão de anotações */
.header button[onclick="abrirPopup()"] {
    background: rgba(255,255,255,0.1);
    border: 1px solid rgba(255,255,255,0.2);
    color: white;
    padding: 6px 12px;
    border-radius: 6px;
    font-size: 14px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.header button[onclick="abrirPopup()"]:hover {
    background: rgba(255,255,255,0.2);
}

/* Fullscreen, hamburger, help, theme */
.header-controls {
    display: flex;
    align-items: center;
    gap: 10px;
}

.fullscreen-btn,
.help-btn,
.theme-toggle {
    background: rgba(255,255,255,0.1);
    border: 1px solid rgba(255,255,255,0.2);
    color: white;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;

}

.fullscreen-btn:hover,
.help-btn:hover,
.theme-toggle:hover {
    background: rgba(255,255,255,0.2);
    transform: scale(1.1);
}


/* Responsividade */
@media (max-width: 768px) {
    .header {
        padding: 0 15px 0 15px;
        height: auto;
        flex-wrap: wrap;
        gap: 8px;
    }
  .header h3 {
    text-align: center;
    font-size: 1.2em;
    margin: 0;
  }

  .search-container {
    width: 100%;
    max-width: none;
    margin-right: 0;
  }

  .search-box {
    width: 100%;
    padding: 8px 36px 8px 12px;
    font-size: 14px;
  }

  .font-controls,
  .header button[onclick="abrirPopup()"] {
    width: 100%;
    display: flex;
    justify-content: center;
    margin-right: 0;
  }

  .font-controls {
    justify-content: center;
  }

  .font-btn {
    width: 36px;
    height: 36px;
  }

  .header button[onclick="abrirPopup()"] {
    padding: 8px;
    font-size: 14px;
  }

  .header-controls {
    justify-content: center;
    width: 100%;
    margin-left: 0;
  }

  .fullscreen-btn,
  .help-btn,
  .theme-toggle {
    width: 36px;
    height: 36px;
  }

  .hamburger {
    margin-right: 10px;
  }
}